ixgbe: filter FIP frames into the FCoE offload queues
[linux-2.6.git] / drivers / block / floppy.c
1 /*
2  *  linux/drivers/block/floppy.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  *  Copyright (C) 1993, 1994  Alain Knaff
6  *  Copyright (C) 1998 Alan Cox
7  */
8
9 /*
10  * 02.12.91 - Changed to static variables to indicate need for reset
11  * and recalibrate. This makes some things easier (output_byte reset
12  * checking etc), and means less interrupt jumping in case of errors,
13  * so the code is hopefully easier to understand.
14  */
15
16 /*
17  * This file is certainly a mess. I've tried my best to get it working,
18  * but I don't like programming floppies, and I have only one anyway.
19  * Urgel. I should check for more errors, and do more graceful error
20  * recovery. Seems there are problems with several drives. I've tried to
21  * correct them. No promises.
22  */
23
24 /*
25  * As with hd.c, all routines within this file can (and will) be called
26  * by interrupts, so extreme caution is needed. A hardware interrupt
27  * handler may not sleep, or a kernel panic will happen. Thus I cannot
28  * call "floppy-on" directly, but have to set a special timer interrupt
29  * etc.
30  */
31
32 /*
33  * 28.02.92 - made track-buffering routines, based on the routines written
34  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
35  */
36
37 /*
38  * Automatic floppy-detection and formatting written by Werner Almesberger
39  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
40  * the floppy-change signal detection.
41  */
42
43 /*
44  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
45  * FDC data overrun bug, added some preliminary stuff for vertical
46  * recording support.
47  *
48  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
49  *
50  * TODO: Errors are still not counted properly.
51  */
52
53 /* 1992/9/20
54  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
55  * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
56  * Christoph H. Hochst\"atter.
57  * I have fixed the shift values to the ones I always use. Maybe a new
58  * ioctl() should be created to be able to modify them.
59  * There is a bug in the driver that makes it impossible to format a
60  * floppy as the first thing after bootup.
61  */
62
63 /*
64  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
65  * this helped the floppy driver as well. Much cleaner, and still seems to
66  * work.
67  */
68
69 /* 1994/6/24 --bbroad-- added the floppy table entries and made
70  * minor modifications to allow 2.88 floppies to be run.
71  */
72
73 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
74  * disk types.
75  */
76
77 /*
78  * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
79  * format bug fixes, but unfortunately some new bugs too...
80  */
81
82 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
83  * errors to allow safe writing by specialized programs.
84  */
85
86 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
87  * by defining bit 1 of the "stretch" parameter to mean put sectors on the
88  * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
89  * drives are "upside-down").
90  */
91
92 /*
93  * 1995/8/26 -- Andreas Busse -- added Mips support.
94  */
95
96 /*
97  * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
98  * features to asm/floppy.h.
99  */
100
101 /*
102  * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
103  */
104
105 /*
106  * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
107  * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
108  * use of '0' for NULL.
109  */
110
111 /*
112  * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
113  * failures.
114  */
115
116 /*
117  * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
118  */
119
120 /*
121  * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
122  * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
123  * being used to store jiffies, which are unsigned longs).
124  */
125
126 /*
127  * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
128  * - get rid of check_region
129  * - s/suser/capable/
130  */
131
132 /*
133  * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
134  * floppy controller (lingering task on list after module is gone... boom.)
135  */
136
137 /*
138  * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
139  * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
140  * requires many non-obvious changes in arch dependent code.
141  */
142
143 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
144  * Better audit of register_blkdev.
145  */
146
147 #undef  FLOPPY_SILENT_DCL_CLEAR
148
149 #define REALLY_SLOW_IO
150
151 #define DEBUGT 2
152
153 #define DPRINT(format, args...) \
154         pr_info("floppy%d: " format, current_drive, ##args)
155
156 #define DCL_DEBUG               /* debug disk change line */
157 #ifdef DCL_DEBUG
158 #define debug_dcl(test, fmt, args...) \
159         do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
160 #else
161 #define debug_dcl(test, fmt, args...) \
162         do { if (0) DPRINT(fmt, ##args); } while (0)
163 #endif
164
165 /* do print messages for unexpected interrupts */
166 static int print_unex = 1;
167 #include <linux/module.h>
168 #include <linux/sched.h>
169 #include <linux/fs.h>
170 #include <linux/kernel.h>
171 #include <linux/timer.h>
172 #include <linux/workqueue.h>
173 #define FDPATCHES
174 #include <linux/fdreg.h>
175 #include <linux/fd.h>
176 #include <linux/hdreg.h>
177 #include <linux/errno.h>
178 #include <linux/slab.h>
179 #include <linux/mm.h>
180 #include <linux/bio.h>
181 #include <linux/string.h>
182 #include <linux/jiffies.h>
183 #include <linux/fcntl.h>
184 #include <linux/delay.h>
185 #include <linux/mc146818rtc.h>  /* CMOS defines */
186 #include <linux/ioport.h>
187 #include <linux/interrupt.h>
188 #include <linux/init.h>
189 #include <linux/platform_device.h>
190 #include <linux/mod_devicetable.h>
191 #include <linux/buffer_head.h>  /* for invalidate_buffers() */
192 #include <linux/mutex.h>
193 #include <linux/io.h>
194 #include <linux/uaccess.h>
195
196 /*
197  * PS/2 floppies have much slower step rates than regular floppies.
198  * It's been recommended that take about 1/4 of the default speed
199  * in some more extreme cases.
200  */
201 static int slow_floppy;
202
203 #include <asm/dma.h>
204 #include <asm/irq.h>
205 #include <asm/system.h>
206
207 static int FLOPPY_IRQ = 6;
208 static int FLOPPY_DMA = 2;
209 static int can_use_virtual_dma = 2;
210 /* =======
211  * can use virtual DMA:
212  * 0 = use of virtual DMA disallowed by config
213  * 1 = use of virtual DMA prescribed by config
214  * 2 = no virtual DMA preference configured.  By default try hard DMA,
215  * but fall back on virtual DMA when not enough memory available
216  */
217
218 static int use_virtual_dma;
219 /* =======
220  * use virtual DMA
221  * 0 using hard DMA
222  * 1 using virtual DMA
223  * This variable is set to virtual when a DMA mem problem arises, and
224  * reset back in floppy_grab_irq_and_dma.
225  * It is not safe to reset it in other circumstances, because the floppy
226  * driver may have several buffers in use at once, and we do currently not
227  * record each buffers capabilities
228  */
229
230 static DEFINE_SPINLOCK(floppy_lock);
231
232 static unsigned short virtual_dma_port = 0x3f0;
233 irqreturn_t floppy_interrupt(int irq, void *dev_id);
234 static int set_dor(int fdc, char mask, char data);
235
236 #define K_64    0x10000         /* 64KB */
237
238 /* the following is the mask of allowed drives. By default units 2 and
239  * 3 of both floppy controllers are disabled, because switching on the
240  * motor of these drives causes system hangs on some PCI computers. drive
241  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
242  * a drive is allowed.
243  *
244  * NOTE: This must come before we include the arch floppy header because
245  *       some ports reference this variable from there. -DaveM
246  */
247
248 static int allowed_drive_mask = 0x33;
249
250 #include <asm/floppy.h>
251
252 static int irqdma_allocated;
253
254 #include <linux/blkdev.h>
255 #include <linux/blkpg.h>
256 #include <linux/cdrom.h>        /* for the compatibility eject ioctl */
257 #include <linux/completion.h>
258
259 static struct request *current_req;
260 static struct request_queue *floppy_queue;
261 static void do_fd_request(struct request_queue *q);
262
263 #ifndef fd_get_dma_residue
264 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
265 #endif
266
267 /* Dma Memory related stuff */
268
269 #ifndef fd_dma_mem_free
270 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
271 #endif
272
273 #ifndef fd_dma_mem_alloc
274 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
275 #endif
276
277 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
278 {
279 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
280         if (*addr)
281                 return;         /* we have the memory */
282         if (can_use_virtual_dma != 2)
283                 return;         /* no fallback allowed */
284         pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
285         *addr = (char *)nodma_mem_alloc(l);
286 #else
287         return;
288 #endif
289 }
290
291 /* End dma memory related stuff */
292
293 static unsigned long fake_change;
294 static bool initialized;
295
296 #define ITYPE(x)        (((x) >> 2) & 0x1f)
297 #define TOMINOR(x)      ((x & 3) | ((x & 4) << 5))
298 #define UNIT(x)         ((x) & 0x03)            /* drive on fdc */
299 #define FDC(x)          (((x) & 0x04) >> 2)     /* fdc of drive */
300         /* reverse mapping from unit and fdc to drive */
301 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
302
303 #define DP      (&drive_params[current_drive])
304 #define DRS     (&drive_state[current_drive])
305 #define DRWE    (&write_errors[current_drive])
306 #define FDCS    (&fdc_state[fdc])
307
308 #define UDP     (&drive_params[drive])
309 #define UDRS    (&drive_state[drive])
310 #define UDRWE   (&write_errors[drive])
311 #define UFDCS   (&fdc_state[FDC(drive)])
312
313 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
314 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
315
316 /* read/write */
317 #define COMMAND         (raw_cmd->cmd[0])
318 #define DR_SELECT       (raw_cmd->cmd[1])
319 #define TRACK           (raw_cmd->cmd[2])
320 #define HEAD            (raw_cmd->cmd[3])
321 #define SECTOR          (raw_cmd->cmd[4])
322 #define SIZECODE        (raw_cmd->cmd[5])
323 #define SECT_PER_TRACK  (raw_cmd->cmd[6])
324 #define GAP             (raw_cmd->cmd[7])
325 #define SIZECODE2       (raw_cmd->cmd[8])
326 #define NR_RW 9
327
328 /* format */
329 #define F_SIZECODE      (raw_cmd->cmd[2])
330 #define F_SECT_PER_TRACK (raw_cmd->cmd[3])
331 #define F_GAP           (raw_cmd->cmd[4])
332 #define F_FILL          (raw_cmd->cmd[5])
333 #define NR_F 6
334
335 /*
336  * Maximum disk size (in kilobytes).
337  * This default is used whenever the current disk size is unknown.
338  * [Now it is rather a minimum]
339  */
340 #define MAX_DISK_SIZE 4         /* 3984 */
341
342 /*
343  * globals used by 'result()'
344  */
345 #define MAX_REPLIES 16
346 static unsigned char reply_buffer[MAX_REPLIES];
347 static int inr;         /* size of reply buffer, when called from interrupt */
348 #define ST0             (reply_buffer[0])
349 #define ST1             (reply_buffer[1])
350 #define ST2             (reply_buffer[2])
351 #define ST3             (reply_buffer[0])       /* result of GETSTATUS */
352 #define R_TRACK         (reply_buffer[3])
353 #define R_HEAD          (reply_buffer[4])
354 #define R_SECTOR        (reply_buffer[5])
355 #define R_SIZECODE      (reply_buffer[6])
356
357 #define SEL_DLY         (2 * HZ / 100)
358
359 /*
360  * this struct defines the different floppy drive types.
361  */
362 static struct {
363         struct floppy_drive_params params;
364         const char *name;       /* name printed while booting */
365 } default_drive_params[] = {
366 /* NOTE: the time values in jiffies should be in msec!
367  CMOS drive type
368   |     Maximum data rate supported by drive type
369   |     |   Head load time, msec
370   |     |   |   Head unload time, msec (not used)
371   |     |   |   |     Step rate interval, usec
372   |     |   |   |     |       Time needed for spinup time (jiffies)
373   |     |   |   |     |       |      Timeout for spinning down (jiffies)
374   |     |   |   |     |       |      |   Spindown offset (where disk stops)
375   |     |   |   |     |       |      |   |     Select delay
376   |     |   |   |     |       |      |   |     |     RPS
377   |     |   |   |     |       |      |   |     |     |    Max number of tracks
378   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
379   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
380   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
381 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
382       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
383
384 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
385       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
386
387 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
388       0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
389
390 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
391       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
392
393 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
394       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
395
396 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
397       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
398
399 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
400       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
401 /*    |  --autodetected formats---    |      |      |
402  *    read_track                      |      |    Name printed when booting
403  *                                    |     Native format
404  *                  Frequency of disk change checks */
405 };
406
407 static struct floppy_drive_params drive_params[N_DRIVE];
408 static struct floppy_drive_struct drive_state[N_DRIVE];
409 static struct floppy_write_errors write_errors[N_DRIVE];
410 static struct timer_list motor_off_timer[N_DRIVE];
411 static struct gendisk *disks[N_DRIVE];
412 static struct block_device *opened_bdev[N_DRIVE];
413 static DEFINE_MUTEX(open_lock);
414 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
415
416 /*
417  * This struct defines the different floppy types.
418  *
419  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
420  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
421  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
422  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
423  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
424  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
425  * side 0 is on physical side 0 (but with the misnamed sector IDs).
426  * 'stretch' should probably be renamed to something more general, like
427  * 'options'.
428  *
429  * Bits 2 through 9 of 'stretch' tell the number of the first sector.
430  * The LSB (bit 2) is flipped. For most disks, the first sector
431  * is 1 (represented by 0x00<<2).  For some CP/M and music sampler
432  * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
433  * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
434  *
435  * Other parameters should be self-explanatory (see also setfdprm(8)).
436  */
437 /*
438             Size
439              |  Sectors per track
440              |  | Head
441              |  | |  Tracks
442              |  | |  | Stretch
443              |  | |  | |  Gap 1 size
444              |  | |  | |    |  Data rate, | 0x40 for perp
445              |  | |  | |    |    |  Spec1 (stepping rate, head unload
446              |  | |  | |    |    |    |    /fmt gap (gap2) */
447 static struct floppy_struct floppy_type[32] = {
448         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
449         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
450         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
451         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
452         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
453         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
454         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
455         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
456         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
457         { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /*  9 3.12MB 3.5"   */
458
459         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
460         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
461         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
462         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
463         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
464         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
465         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
466         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
467         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
468         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
469
470         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
471         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
472         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
473         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
474         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
475         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
476         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
477         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
478         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
479         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
480
481         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
482         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
483 };
484
485 #define SECTSIZE (_FD_SECTSIZE(*floppy))
486
487 /* Auto-detection: Disk type used until the next media change occurs. */
488 static struct floppy_struct *current_type[N_DRIVE];
489
490 /*
491  * User-provided type information. current_type points to
492  * the respective entry of this array.
493  */
494 static struct floppy_struct user_params[N_DRIVE];
495
496 static sector_t floppy_sizes[256];
497
498 static char floppy_device_name[] = "floppy";
499
500 /*
501  * The driver is trying to determine the correct media format
502  * while probing is set. rw_interrupt() clears it after a
503  * successful access.
504  */
505 static int probing;
506
507 /* Synchronization of FDC access. */
508 #define FD_COMMAND_NONE         -1
509 #define FD_COMMAND_ERROR        2
510 #define FD_COMMAND_OKAY         3
511
512 static volatile int command_status = FD_COMMAND_NONE;
513 static unsigned long fdc_busy;
514 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
515 static DECLARE_WAIT_QUEUE_HEAD(command_done);
516
517 #define NO_SIGNAL (!interruptible || !signal_pending(current))
518
519 /* Errors during formatting are counted here. */
520 static int format_errors;
521
522 /* Format request descriptor. */
523 static struct format_descr format_req;
524
525 /*
526  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
527  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
528  * H is head unload time (1=16ms, 2=32ms, etc)
529  */
530
531 /*
532  * Track buffer
533  * Because these are written to by the DMA controller, they must
534  * not contain a 64k byte boundary crossing, or data will be
535  * corrupted/lost.
536  */
537 static char *floppy_track_buffer;
538 static int max_buffer_sectors;
539
540 static int *errors;
541 typedef void (*done_f)(int);
542 static struct cont_t {
543         void (*interrupt)(void);
544                                 /* this is called after the interrupt of the
545                                  * main command */
546         void (*redo)(void);     /* this is called to retry the operation */
547         void (*error)(void);    /* this is called to tally an error */
548         done_f done;            /* this is called to say if the operation has
549                                  * succeeded/failed */
550 } *cont;
551
552 static void floppy_ready(void);
553 static void floppy_start(void);
554 static void process_fd_request(void);
555 static void recalibrate_floppy(void);
556 static void floppy_shutdown(unsigned long);
557
558 static int floppy_request_regions(int);
559 static void floppy_release_regions(int);
560 static int floppy_grab_irq_and_dma(void);
561 static void floppy_release_irq_and_dma(void);
562
563 /*
564  * The "reset" variable should be tested whenever an interrupt is scheduled,
565  * after the commands have been sent. This is to ensure that the driver doesn't
566  * get wedged when the interrupt doesn't come because of a failed command.
567  * reset doesn't need to be tested before sending commands, because
568  * output_byte is automatically disabled when reset is set.
569  */
570 static void reset_fdc(void);
571
572 /*
573  * These are global variables, as that's the easiest way to give
574  * information to interrupts. They are the data used for the current
575  * request.
576  */
577 #define NO_TRACK        -1
578 #define NEED_1_RECAL    -2
579 #define NEED_2_RECAL    -3
580
581 static int usage_count;
582
583 /* buffer related variables */
584 static int buffer_track = -1;
585 static int buffer_drive = -1;
586 static int buffer_min = -1;
587 static int buffer_max = -1;
588
589 /* fdc related variables, should end up in a struct */
590 static struct floppy_fdc_state fdc_state[N_FDC];
591 static int fdc;                 /* current fdc */
592
593 static struct floppy_struct *_floppy = floppy_type;
594 static unsigned char current_drive;
595 static long current_count_sectors;
596 static unsigned char fsector_t; /* sector in track */
597 static unsigned char in_sector_offset;  /* offset within physical sector,
598                                          * expressed in units of 512 bytes */
599
600 #ifndef fd_eject
601 static inline int fd_eject(int drive)
602 {
603         return -EINVAL;
604 }
605 #endif
606
607 /*
608  * Debugging
609  * =========
610  */
611 #ifdef DEBUGT
612 static long unsigned debugtimer;
613
614 static inline void set_debugt(void)
615 {
616         debugtimer = jiffies;
617 }
618
619 static inline void debugt(const char *func, const char *msg)
620 {
621         if (DP->flags & DEBUGT)
622                 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
623 }
624 #else
625 static inline void set_debugt(void) { }
626 static inline void debugt(const char *func, const char *msg) { }
627 #endif /* DEBUGT */
628
629 typedef void (*timeout_fn)(unsigned long);
630 static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
631
632 static const char *timeout_message;
633
634 static void is_alive(const char *func, const char *message)
635 {
636         /* this routine checks whether the floppy driver is "alive" */
637         if (test_bit(0, &fdc_busy) && command_status < 2 &&
638             !timer_pending(&fd_timeout)) {
639                 DPRINT("%s: timeout handler died.  %s\n", func, message);
640         }
641 }
642
643 static void (*do_floppy)(void) = NULL;
644
645 #define OLOGSIZE 20
646
647 static void (*lasthandler)(void);
648 static unsigned long interruptjiffies;
649 static unsigned long resultjiffies;
650 static int resultsize;
651 static unsigned long lastredo;
652
653 static struct output_log {
654         unsigned char data;
655         unsigned char status;
656         unsigned long jiffies;
657 } output_log[OLOGSIZE];
658
659 static int output_log_pos;
660
661 #define current_reqD -1
662 #define MAXTIMEOUT -2
663
664 static void __reschedule_timeout(int drive, const char *message)
665 {
666         if (drive == current_reqD)
667                 drive = current_drive;
668         del_timer(&fd_timeout);
669         if (drive < 0 || drive >= N_DRIVE) {
670                 fd_timeout.expires = jiffies + 20UL * HZ;
671                 drive = 0;
672         } else
673                 fd_timeout.expires = jiffies + UDP->timeout;
674         add_timer(&fd_timeout);
675         if (UDP->flags & FD_DEBUG)
676                 DPRINT("reschedule timeout %s\n", message);
677         timeout_message = message;
678 }
679
680 static void reschedule_timeout(int drive, const char *message)
681 {
682         unsigned long flags;
683
684         spin_lock_irqsave(&floppy_lock, flags);
685         __reschedule_timeout(drive, message);
686         spin_unlock_irqrestore(&floppy_lock, flags);
687 }
688
689 #define INFBOUND(a, b) (a) = max_t(int, a, b)
690 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
691
692 /*
693  * Bottom half floppy driver.
694  * ==========================
695  *
696  * This part of the file contains the code talking directly to the hardware,
697  * and also the main service loop (seek-configure-spinup-command)
698  */
699
700 /*
701  * disk change.
702  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
703  * and the last_checked date.
704  *
705  * last_checked is the date of the last check which showed 'no disk change'
706  * FD_DISK_CHANGE is set under two conditions:
707  * 1. The floppy has been changed after some i/o to that floppy already
708  *    took place.
709  * 2. No floppy disk is in the drive. This is done in order to ensure that
710  *    requests are quickly flushed in case there is no disk in the drive. It
711  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
712  *    the drive.
713  *
714  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
715  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
716  *  each seek. If a disk is present, the disk change line should also be
717  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
718  *  change line is set, this means either that no disk is in the drive, or
719  *  that it has been removed since the last seek.
720  *
721  * This means that we really have a third possibility too:
722  *  The floppy has been changed after the last seek.
723  */
724
725 static int disk_change(int drive)
726 {
727         int fdc = FDC(drive);
728
729         if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
730                 DPRINT("WARNING disk change called early\n");
731         if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
732             (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
733                 DPRINT("probing disk change on unselected drive\n");
734                 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
735                        (unsigned int)FDCS->dor);
736         }
737
738         debug_dcl(UDP->flags,
739                   "checking disk change line for drive %d\n", drive);
740         debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
741         debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
742         debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);
743
744         if (UDP->flags & FD_BROKEN_DCL)
745                 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
746         if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
747                 set_bit(FD_VERIFY_BIT, &UDRS->flags);
748                                         /* verify write protection */
749
750                 if (UDRS->maxblock)     /* mark it changed */
751                         set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
752
753                 /* invalidate its geometry */
754                 if (UDRS->keep_data >= 0) {
755                         if ((UDP->flags & FTD_MSG) &&
756                             current_type[drive] != NULL)
757                                 DPRINT("Disk type is undefined after disk change\n");
758                         current_type[drive] = NULL;
759                         floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
760                 }
761
762                 return 1;
763         } else {
764                 UDRS->last_checked = jiffies;
765                 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
766         }
767         return 0;
768 }
769
770 static inline int is_selected(int dor, int unit)
771 {
772         return ((dor & (0x10 << unit)) && (dor & 3) == unit);
773 }
774
775 static bool is_ready_state(int status)
776 {
777         int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
778         return state == STATUS_READY;
779 }
780
781 static int set_dor(int fdc, char mask, char data)
782 {
783         unsigned char unit;
784         unsigned char drive;
785         unsigned char newdor;
786         unsigned char olddor;
787
788         if (FDCS->address == -1)
789                 return -1;
790
791         olddor = FDCS->dor;
792         newdor = (olddor & mask) | data;
793         if (newdor != olddor) {
794                 unit = olddor & 0x3;
795                 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
796                         drive = REVDRIVE(fdc, unit);
797                         debug_dcl(UDP->flags,
798                                   "calling disk change from set_dor\n");
799                         disk_change(drive);
800                 }
801                 FDCS->dor = newdor;
802                 fd_outb(newdor, FD_DOR);
803
804                 unit = newdor & 0x3;
805                 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
806                         drive = REVDRIVE(fdc, unit);
807                         UDRS->select_date = jiffies;
808                 }
809         }
810         return olddor;
811 }
812
813 static void twaddle(void)
814 {
815         if (DP->select_delay)
816                 return;
817         fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
818         fd_outb(FDCS->dor, FD_DOR);
819         DRS->select_date = jiffies;
820 }
821
822 /*
823  * Reset all driver information about the current fdc.
824  * This is needed after a reset, and after a raw command.
825  */
826 static void reset_fdc_info(int mode)
827 {
828         int drive;
829
830         FDCS->spec1 = FDCS->spec2 = -1;
831         FDCS->need_configure = 1;
832         FDCS->perp_mode = 1;
833         FDCS->rawcmd = 0;
834         for (drive = 0; drive < N_DRIVE; drive++)
835                 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
836                         UDRS->track = NEED_2_RECAL;
837 }
838
839 /* selects the fdc and drive, and enables the fdc's input/dma. */
840 static void set_fdc(int drive)
841 {
842         if (drive >= 0 && drive < N_DRIVE) {
843                 fdc = FDC(drive);
844                 current_drive = drive;
845         }
846         if (fdc != 1 && fdc != 0) {
847                 pr_info("bad fdc value\n");
848                 return;
849         }
850         set_dor(fdc, ~0, 8);
851 #if N_FDC > 1
852         set_dor(1 - fdc, ~8, 0);
853 #endif
854         if (FDCS->rawcmd == 2)
855                 reset_fdc_info(1);
856         if (fd_inb(FD_STATUS) != STATUS_READY)
857                 FDCS->reset = 1;
858 }
859
860 /* locks the driver */
861 static int _lock_fdc(int drive, bool interruptible, int line)
862 {
863         if (!usage_count) {
864                 pr_err("Trying to lock fdc while usage count=0 at line %d\n",
865                        line);
866                 return -1;
867         }
868
869         if (test_and_set_bit(0, &fdc_busy)) {
870                 DECLARE_WAITQUEUE(wait, current);
871                 add_wait_queue(&fdc_wait, &wait);
872
873                 for (;;) {
874                         set_current_state(TASK_INTERRUPTIBLE);
875
876                         if (!test_and_set_bit(0, &fdc_busy))
877                                 break;
878
879                         schedule();
880
881                         if (!NO_SIGNAL) {
882                                 remove_wait_queue(&fdc_wait, &wait);
883                                 return -EINTR;
884                         }
885                 }
886
887                 set_current_state(TASK_RUNNING);
888                 remove_wait_queue(&fdc_wait, &wait);
889                 flush_scheduled_work();
890         }
891         command_status = FD_COMMAND_NONE;
892
893         __reschedule_timeout(drive, "lock fdc");
894         set_fdc(drive);
895         return 0;
896 }
897
898 #define lock_fdc(drive, interruptible)                  \
899         _lock_fdc(drive, interruptible, __LINE__)
900
901 /* unlocks the driver */
902 static inline void unlock_fdc(void)
903 {
904         unsigned long flags;
905
906         raw_cmd = NULL;
907         if (!test_bit(0, &fdc_busy))
908                 DPRINT("FDC access conflict!\n");
909
910         if (do_floppy)
911                 DPRINT("device interrupt still active at FDC release: %pf!\n",
912                        do_floppy);
913         command_status = FD_COMMAND_NONE;
914         spin_lock_irqsave(&floppy_lock, flags);
915         del_timer(&fd_timeout);
916         cont = NULL;
917         clear_bit(0, &fdc_busy);
918         if (current_req || blk_peek_request(floppy_queue))
919                 do_fd_request(floppy_queue);
920         spin_unlock_irqrestore(&floppy_lock, flags);
921         wake_up(&fdc_wait);
922 }
923
924 /* switches the motor off after a given timeout */
925 static void motor_off_callback(unsigned long nr)
926 {
927         unsigned char mask = ~(0x10 << UNIT(nr));
928
929         set_dor(FDC(nr), mask, 0);
930 }
931
932 /* schedules motor off */
933 static void floppy_off(unsigned int drive)
934 {
935         unsigned long volatile delta;
936         int fdc = FDC(drive);
937
938         if (!(FDCS->dor & (0x10 << UNIT(drive))))
939                 return;
940
941         del_timer(motor_off_timer + drive);
942
943         /* make spindle stop in a position which minimizes spinup time
944          * next time */
945         if (UDP->rps) {
946                 delta = jiffies - UDRS->first_read_date + HZ -
947                     UDP->spindown_offset;
948                 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
949                 motor_off_timer[drive].expires =
950                     jiffies + UDP->spindown - delta;
951         }
952         add_timer(motor_off_timer + drive);
953 }
954
955 /*
956  * cycle through all N_DRIVE floppy drives, for disk change testing.
957  * stopping at current drive. This is done before any long operation, to
958  * be sure to have up to date disk change information.
959  */
960 static void scandrives(void)
961 {
962         int i;
963         int drive;
964         int saved_drive;
965
966         if (DP->select_delay)
967                 return;
968
969         saved_drive = current_drive;
970         for (i = 0; i < N_DRIVE; i++) {
971                 drive = (saved_drive + i + 1) % N_DRIVE;
972                 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
973                         continue;       /* skip closed drives */
974                 set_fdc(drive);
975                 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
976                       (0x10 << UNIT(drive))))
977                         /* switch the motor off again, if it was off to
978                          * begin with */
979                         set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
980         }
981         set_fdc(saved_drive);
982 }
983
984 static void empty(void)
985 {
986 }
987
988 static DECLARE_WORK(floppy_work, NULL);
989
990 static void schedule_bh(void (*handler)(void))
991 {
992         PREPARE_WORK(&floppy_work, (work_func_t)handler);
993         schedule_work(&floppy_work);
994 }
995
996 static DEFINE_TIMER(fd_timer, NULL, 0, 0);
997
998 static void cancel_activity(void)
999 {
1000         unsigned long flags;
1001
1002         spin_lock_irqsave(&floppy_lock, flags);
1003         do_floppy = NULL;
1004         PREPARE_WORK(&floppy_work, (work_func_t)empty);
1005         del_timer(&fd_timer);
1006         spin_unlock_irqrestore(&floppy_lock, flags);
1007 }
1008
1009 /* this function makes sure that the disk stays in the drive during the
1010  * transfer */
1011 static void fd_watchdog(void)
1012 {
1013         debug_dcl(DP->flags, "calling disk change from watchdog\n");
1014
1015         if (disk_change(current_drive)) {
1016                 DPRINT("disk removed during i/o\n");
1017                 cancel_activity();
1018                 cont->done(0);
1019                 reset_fdc();
1020         } else {
1021                 del_timer(&fd_timer);
1022                 fd_timer.function = (timeout_fn)fd_watchdog;
1023                 fd_timer.expires = jiffies + HZ / 10;
1024                 add_timer(&fd_timer);
1025         }
1026 }
1027
1028 static void main_command_interrupt(void)
1029 {
1030         del_timer(&fd_timer);
1031         cont->interrupt();
1032 }
1033
1034 /* waits for a delay (spinup or select) to pass */
1035 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1036 {
1037         if (FDCS->reset) {
1038                 reset_fdc();    /* do the reset during sleep to win time
1039                                  * if we don't need to sleep, it's a good
1040                                  * occasion anyways */
1041                 return 1;
1042         }
1043
1044         if (time_before(jiffies, delay)) {
1045                 del_timer(&fd_timer);
1046                 fd_timer.function = function;
1047                 fd_timer.expires = delay;
1048                 add_timer(&fd_timer);
1049                 return 1;
1050         }
1051         return 0;
1052 }
1053
1054 static DEFINE_SPINLOCK(floppy_hlt_lock);
1055 static int hlt_disabled;
1056 static void floppy_disable_hlt(void)
1057 {
1058         unsigned long flags;
1059
1060         spin_lock_irqsave(&floppy_hlt_lock, flags);
1061         if (!hlt_disabled) {
1062                 hlt_disabled = 1;
1063 #ifdef HAVE_DISABLE_HLT
1064                 disable_hlt();
1065 #endif
1066         }
1067         spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1068 }
1069
1070 static void floppy_enable_hlt(void)
1071 {
1072         unsigned long flags;
1073
1074         spin_lock_irqsave(&floppy_hlt_lock, flags);
1075         if (hlt_disabled) {
1076                 hlt_disabled = 0;
1077 #ifdef HAVE_DISABLE_HLT
1078                 enable_hlt();
1079 #endif
1080         }
1081         spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1082 }
1083
1084 static void setup_DMA(void)
1085 {
1086         unsigned long f;
1087
1088         if (raw_cmd->length == 0) {
1089                 int i;
1090
1091                 pr_info("zero dma transfer size:");
1092                 for (i = 0; i < raw_cmd->cmd_count; i++)
1093                         pr_cont("%x,", raw_cmd->cmd[i]);
1094                 pr_cont("\n");
1095                 cont->done(0);
1096                 FDCS->reset = 1;
1097                 return;
1098         }
1099         if (((unsigned long)raw_cmd->kernel_data) % 512) {
1100                 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1101                 cont->done(0);
1102                 FDCS->reset = 1;
1103                 return;
1104         }
1105         f = claim_dma_lock();
1106         fd_disable_dma();
1107 #ifdef fd_dma_setup
1108         if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1109                          (raw_cmd->flags & FD_RAW_READ) ?
1110                          DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1111                 release_dma_lock(f);
1112                 cont->done(0);
1113                 FDCS->reset = 1;
1114                 return;
1115         }
1116         release_dma_lock(f);
1117 #else
1118         fd_clear_dma_ff();
1119         fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1120         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1121                         DMA_MODE_READ : DMA_MODE_WRITE);
1122         fd_set_dma_addr(raw_cmd->kernel_data);
1123         fd_set_dma_count(raw_cmd->length);
1124         virtual_dma_port = FDCS->address;
1125         fd_enable_dma();
1126         release_dma_lock(f);
1127 #endif
1128         floppy_disable_hlt();
1129 }
1130
1131 static void show_floppy(void);
1132
1133 /* waits until the fdc becomes ready */
1134 static int wait_til_ready(void)
1135 {
1136         int status;
1137         int counter;
1138
1139         if (FDCS->reset)
1140                 return -1;
1141         for (counter = 0; counter < 10000; counter++) {
1142                 status = fd_inb(FD_STATUS);
1143                 if (status & STATUS_READY)
1144                         return status;
1145         }
1146         if (initialized) {
1147                 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1148                 show_floppy();
1149         }
1150         FDCS->reset = 1;
1151         return -1;
1152 }
1153
1154 /* sends a command byte to the fdc */
1155 static int output_byte(char byte)
1156 {
1157         int status = wait_til_ready();
1158
1159         if (status < 0)
1160                 return -1;
1161
1162         if (is_ready_state(status)) {
1163                 fd_outb(byte, FD_DATA);
1164                 output_log[output_log_pos].data = byte;
1165                 output_log[output_log_pos].status = status;
1166                 output_log[output_log_pos].jiffies = jiffies;
1167                 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1168                 return 0;
1169         }
1170         FDCS->reset = 1;
1171         if (initialized) {
1172                 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1173                        byte, fdc, status);
1174                 show_floppy();
1175         }
1176         return -1;
1177 }
1178
1179 /* gets the response from the fdc */
1180 static int result(void)
1181 {
1182         int i;
1183         int status = 0;
1184
1185         for (i = 0; i < MAX_REPLIES; i++) {
1186                 status = wait_til_ready();
1187                 if (status < 0)
1188                         break;
1189                 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1190                 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1191                         resultjiffies = jiffies;
1192                         resultsize = i;
1193                         return i;
1194                 }
1195                 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1196                         reply_buffer[i] = fd_inb(FD_DATA);
1197                 else
1198                         break;
1199         }
1200         if (initialized) {
1201                 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1202                        fdc, status, i);
1203                 show_floppy();
1204         }
1205         FDCS->reset = 1;
1206         return -1;
1207 }
1208
1209 #define MORE_OUTPUT -2
1210 /* does the fdc need more output? */
1211 static int need_more_output(void)
1212 {
1213         int status = wait_til_ready();
1214
1215         if (status < 0)
1216                 return -1;
1217
1218         if (is_ready_state(status))
1219                 return MORE_OUTPUT;
1220
1221         return result();
1222 }
1223
1224 /* Set perpendicular mode as required, based on data rate, if supported.
1225  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1226  */
1227 static inline void perpendicular_mode(void)
1228 {
1229         unsigned char perp_mode;
1230
1231         if (raw_cmd->rate & 0x40) {
1232                 switch (raw_cmd->rate & 3) {
1233                 case 0:
1234                         perp_mode = 2;
1235                         break;
1236                 case 3:
1237                         perp_mode = 3;
1238                         break;
1239                 default:
1240                         DPRINT("Invalid data rate for perpendicular mode!\n");
1241                         cont->done(0);
1242                         FDCS->reset = 1;
1243                                         /*
1244                                          * convenient way to return to
1245                                          * redo without too much hassle
1246                                          * (deep stack et al.)
1247                                          */
1248                         return;
1249                 }
1250         } else
1251                 perp_mode = 0;
1252
1253         if (FDCS->perp_mode == perp_mode)
1254                 return;
1255         if (FDCS->version >= FDC_82077_ORIG) {
1256                 output_byte(FD_PERPENDICULAR);
1257                 output_byte(perp_mode);
1258                 FDCS->perp_mode = perp_mode;
1259         } else if (perp_mode) {
1260                 DPRINT("perpendicular mode not supported by this FDC.\n");
1261         }
1262 }                               /* perpendicular_mode */
1263
1264 static int fifo_depth = 0xa;
1265 static int no_fifo;
1266
1267 static int fdc_configure(void)
1268 {
1269         /* Turn on FIFO */
1270         output_byte(FD_CONFIGURE);
1271         if (need_more_output() != MORE_OUTPUT)
1272                 return 0;
1273         output_byte(0);
1274         output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1275         output_byte(0);         /* pre-compensation from track
1276                                    0 upwards */
1277         return 1;
1278 }
1279
1280 #define NOMINAL_DTR 500
1281
1282 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1283  * head load time, and DMA disable flag to values needed by floppy.
1284  *
1285  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1286  * to account for the data rate-based scaling done by the 82072 and 82077
1287  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1288  * 8272a).
1289  *
1290  * Note that changing the data transfer rate has a (probably deleterious)
1291  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1292  * fdc_specify is called again after each data transfer rate
1293  * change.
1294  *
1295  * srt: 1000 to 16000 in microseconds
1296  * hut: 16 to 240 milliseconds
1297  * hlt: 2 to 254 milliseconds
1298  *
1299  * These values are rounded up to the next highest available delay time.
1300  */
1301 static void fdc_specify(void)
1302 {
1303         unsigned char spec1;
1304         unsigned char spec2;
1305         unsigned long srt;
1306         unsigned long hlt;
1307         unsigned long hut;
1308         unsigned long dtr = NOMINAL_DTR;
1309         unsigned long scale_dtr = NOMINAL_DTR;
1310         int hlt_max_code = 0x7f;
1311         int hut_max_code = 0xf;
1312
1313         if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1314                 fdc_configure();
1315                 FDCS->need_configure = 0;
1316         }
1317
1318         switch (raw_cmd->rate & 0x03) {
1319         case 3:
1320                 dtr = 1000;
1321                 break;
1322         case 1:
1323                 dtr = 300;
1324                 if (FDCS->version >= FDC_82078) {
1325                         /* chose the default rate table, not the one
1326                          * where 1 = 2 Mbps */
1327                         output_byte(FD_DRIVESPEC);
1328                         if (need_more_output() == MORE_OUTPUT) {
1329                                 output_byte(UNIT(current_drive));
1330                                 output_byte(0xc0);
1331                         }
1332                 }
1333                 break;
1334         case 2:
1335                 dtr = 250;
1336                 break;
1337         }
1338
1339         if (FDCS->version >= FDC_82072) {
1340                 scale_dtr = dtr;
1341                 hlt_max_code = 0x00;    /* 0==256msec*dtr0/dtr (not linear!) */
1342                 hut_max_code = 0x0;     /* 0==256msec*dtr0/dtr (not linear!) */
1343         }
1344
1345         /* Convert step rate from microseconds to milliseconds and 4 bits */
1346         srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1347         if (slow_floppy)
1348                 srt = srt / 4;
1349
1350         SUPBOUND(srt, 0xf);
1351         INFBOUND(srt, 0);
1352
1353         hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1354         if (hlt < 0x01)
1355                 hlt = 0x01;
1356         else if (hlt > 0x7f)
1357                 hlt = hlt_max_code;
1358
1359         hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1360         if (hut < 0x1)
1361                 hut = 0x1;
1362         else if (hut > 0xf)
1363                 hut = hut_max_code;
1364
1365         spec1 = (srt << 4) | hut;
1366         spec2 = (hlt << 1) | (use_virtual_dma & 1);
1367
1368         /* If these parameters did not change, just return with success */
1369         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1370                 /* Go ahead and set spec1 and spec2 */
1371                 output_byte(FD_SPECIFY);
1372                 output_byte(FDCS->spec1 = spec1);
1373                 output_byte(FDCS->spec2 = spec2);
1374         }
1375 }                               /* fdc_specify */
1376
1377 /* Set the FDC's data transfer rate on behalf of the specified drive.
1378  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1379  * of the specify command (i.e. using the fdc_specify function).
1380  */
1381 static int fdc_dtr(void)
1382 {
1383         /* If data rate not already set to desired value, set it. */
1384         if ((raw_cmd->rate & 3) == FDCS->dtr)
1385                 return 0;
1386
1387         /* Set dtr */
1388         fd_outb(raw_cmd->rate & 3, FD_DCR);
1389
1390         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1391          * need a stabilization period of several milliseconds to be
1392          * enforced after data rate changes before R/W operations.
1393          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1394          */
1395         FDCS->dtr = raw_cmd->rate & 3;
1396         return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1397                                       (timeout_fn)floppy_ready);
1398 }                               /* fdc_dtr */
1399
1400 static void tell_sector(void)
1401 {
1402         pr_cont(": track %d, head %d, sector %d, size %d",
1403                 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1404 }                               /* tell_sector */
1405
1406 static void print_errors(void)
1407 {
1408         DPRINT("");
1409         if (ST0 & ST0_ECE) {
1410                 pr_cont("Recalibrate failed!");
1411         } else if (ST2 & ST2_CRC) {
1412                 pr_cont("data CRC error");
1413                 tell_sector();
1414         } else if (ST1 & ST1_CRC) {
1415                 pr_cont("CRC error");
1416                 tell_sector();
1417         } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1418                    (ST2 & ST2_MAM)) {
1419                 if (!probing) {
1420                         pr_cont("sector not found");
1421                         tell_sector();
1422                 } else
1423                         pr_cont("probe failed...");
1424         } else if (ST2 & ST2_WC) {      /* seek error */
1425                 pr_cont("wrong cylinder");
1426         } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1427                 pr_cont("bad cylinder");
1428         } else {
1429                 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1430                         ST0, ST1, ST2);
1431                 tell_sector();
1432         }
1433         pr_cont("\n");
1434 }
1435
1436 /*
1437  * OK, this error interpreting routine is called after a
1438  * DMA read/write has succeeded
1439  * or failed, so we check the results, and copy any buffers.
1440  * hhb: Added better error reporting.
1441  * ak: Made this into a separate routine.
1442  */
1443 static int interpret_errors(void)
1444 {
1445         char bad;
1446
1447         if (inr != 7) {
1448                 DPRINT("-- FDC reply error\n");
1449                 FDCS->reset = 1;
1450                 return 1;
1451         }
1452
1453         /* check IC to find cause of interrupt */
1454         switch (ST0 & ST0_INTR) {
1455         case 0x40:              /* error occurred during command execution */
1456                 if (ST1 & ST1_EOC)
1457                         return 0;       /* occurs with pseudo-DMA */
1458                 bad = 1;
1459                 if (ST1 & ST1_WP) {
1460                         DPRINT("Drive is write protected\n");
1461                         clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1462                         cont->done(0);
1463                         bad = 2;
1464                 } else if (ST1 & ST1_ND) {
1465                         set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1466                 } else if (ST1 & ST1_OR) {
1467                         if (DP->flags & FTD_MSG)
1468                                 DPRINT("Over/Underrun - retrying\n");
1469                         bad = 0;
1470                 } else if (*errors >= DP->max_errors.reporting) {
1471                         print_errors();
1472                 }
1473                 if (ST2 & ST2_WC || ST2 & ST2_BC)
1474                         /* wrong cylinder => recal */
1475                         DRS->track = NEED_2_RECAL;
1476                 return bad;
1477         case 0x80:              /* invalid command given */
1478                 DPRINT("Invalid FDC command given!\n");
1479                 cont->done(0);
1480                 return 2;
1481         case 0xc0:
1482                 DPRINT("Abnormal termination caused by polling\n");
1483                 cont->error();
1484                 return 2;
1485         default:                /* (0) Normal command termination */
1486                 return 0;
1487         }
1488 }
1489
1490 /*
1491  * This routine is called when everything should be correctly set up
1492  * for the transfer (i.e. floppy motor is on, the correct floppy is
1493  * selected, and the head is sitting on the right track).
1494  */
1495 static void setup_rw_floppy(void)
1496 {
1497         int i;
1498         int r;
1499         int flags;
1500         int dflags;
1501         unsigned long ready_date;
1502         timeout_fn function;
1503
1504         flags = raw_cmd->flags;
1505         if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1506                 flags |= FD_RAW_INTR;
1507
1508         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1509                 ready_date = DRS->spinup_date + DP->spinup;
1510                 /* If spinup will take a long time, rerun scandrives
1511                  * again just before spinup completion. Beware that
1512                  * after scandrives, we must again wait for selection.
1513                  */
1514                 if (time_after(ready_date, jiffies + DP->select_delay)) {
1515                         ready_date -= DP->select_delay;
1516                         function = (timeout_fn)floppy_start;
1517                 } else
1518                         function = (timeout_fn)setup_rw_floppy;
1519
1520                 /* wait until the floppy is spinning fast enough */
1521                 if (fd_wait_for_completion(ready_date, function))
1522                         return;
1523         }
1524         dflags = DRS->flags;
1525
1526         if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1527                 setup_DMA();
1528
1529         if (flags & FD_RAW_INTR)
1530                 do_floppy = main_command_interrupt;
1531
1532         r = 0;
1533         for (i = 0; i < raw_cmd->cmd_count; i++)
1534                 r |= output_byte(raw_cmd->cmd[i]);
1535
1536         debugt(__func__, "rw_command");
1537
1538         if (r) {
1539                 cont->error();
1540                 reset_fdc();
1541                 return;
1542         }
1543
1544         if (!(flags & FD_RAW_INTR)) {
1545                 inr = result();
1546                 cont->interrupt();
1547         } else if (flags & FD_RAW_NEED_DISK)
1548                 fd_watchdog();
1549 }
1550
1551 static int blind_seek;
1552
1553 /*
1554  * This is the routine called after every seek (or recalibrate) interrupt
1555  * from the floppy controller.
1556  */
1557 static void seek_interrupt(void)
1558 {
1559         debugt(__func__, "");
1560         if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1561                 DPRINT("seek failed\n");
1562                 DRS->track = NEED_2_RECAL;
1563                 cont->error();
1564                 cont->redo();
1565                 return;
1566         }
1567         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1568                 debug_dcl(DP->flags,
1569                           "clearing NEWCHANGE flag because of effective seek\n");
1570                 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1571                 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1572                                         /* effective seek */
1573                 DRS->select_date = jiffies;
1574         }
1575         DRS->track = ST1;
1576         floppy_ready();
1577 }
1578
1579 static void check_wp(void)
1580 {
1581         if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1582                                         /* check write protection */
1583                 output_byte(FD_GETSTATUS);
1584                 output_byte(UNIT(current_drive));
1585                 if (result() != 1) {
1586                         FDCS->reset = 1;
1587                         return;
1588                 }
1589                 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1590                 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1591                 debug_dcl(DP->flags,
1592                           "checking whether disk is write protected\n");
1593                 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1594                 if (!(ST3 & 0x40))
1595                         set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1596                 else
1597                         clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1598         }
1599 }
1600
1601 static void seek_floppy(void)
1602 {
1603         int track;
1604
1605         blind_seek = 0;
1606
1607         debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
1608
1609         if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1610             disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1611                 /* the media changed flag should be cleared after the seek.
1612                  * If it isn't, this means that there is really no disk in
1613                  * the drive.
1614                  */
1615                 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1616                 cont->done(0);
1617                 cont->redo();
1618                 return;
1619         }
1620         if (DRS->track <= NEED_1_RECAL) {
1621                 recalibrate_floppy();
1622                 return;
1623         } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1624                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1625                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1626                 /* we seek to clear the media-changed condition. Does anybody
1627                  * know a more elegant way, which works on all drives? */
1628                 if (raw_cmd->track)
1629                         track = raw_cmd->track - 1;
1630                 else {
1631                         if (DP->flags & FD_SILENT_DCL_CLEAR) {
1632                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1633                                 blind_seek = 1;
1634                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1635                         }
1636                         track = 1;
1637                 }
1638         } else {
1639                 check_wp();
1640                 if (raw_cmd->track != DRS->track &&
1641                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1642                         track = raw_cmd->track;
1643                 else {
1644                         setup_rw_floppy();
1645                         return;
1646                 }
1647         }
1648
1649         do_floppy = seek_interrupt;
1650         output_byte(FD_SEEK);
1651         output_byte(UNIT(current_drive));
1652         if (output_byte(track) < 0) {
1653                 reset_fdc();
1654                 return;
1655         }
1656         debugt(__func__, "");
1657 }
1658
1659 static void recal_interrupt(void)
1660 {
1661         debugt(__func__, "");
1662         if (inr != 2)
1663                 FDCS->reset = 1;
1664         else if (ST0 & ST0_ECE) {
1665                 switch (DRS->track) {
1666                 case NEED_1_RECAL:
1667                         debugt(__func__, "need 1 recal");
1668                         /* after a second recalibrate, we still haven't
1669                          * reached track 0. Probably no drive. Raise an
1670                          * error, as failing immediately might upset
1671                          * computers possessed by the Devil :-) */
1672                         cont->error();
1673                         cont->redo();
1674                         return;
1675                 case NEED_2_RECAL:
1676                         debugt(__func__, "need 2 recal");
1677                         /* If we already did a recalibrate,
1678                          * and we are not at track 0, this
1679                          * means we have moved. (The only way
1680                          * not to move at recalibration is to
1681                          * be already at track 0.) Clear the
1682                          * new change flag */
1683                         debug_dcl(DP->flags,
1684                                   "clearing NEWCHANGE flag because of second recalibrate\n");
1685
1686                         clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1687                         DRS->select_date = jiffies;
1688                         /* fall through */
1689                 default:
1690                         debugt(__func__, "default");
1691                         /* Recalibrate moves the head by at
1692                          * most 80 steps. If after one
1693                          * recalibrate we don't have reached
1694                          * track 0, this might mean that we
1695                          * started beyond track 80.  Try
1696                          * again.  */
1697                         DRS->track = NEED_1_RECAL;
1698                         break;
1699                 }
1700         } else
1701                 DRS->track = ST1;
1702         floppy_ready();
1703 }
1704
1705 static void print_result(char *message, int inr)
1706 {
1707         int i;
1708
1709         DPRINT("%s ", message);
1710         if (inr >= 0)
1711                 for (i = 0; i < inr; i++)
1712                         pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1713         pr_cont("\n");
1714 }
1715
1716 /* interrupt handler. Note that this can be called externally on the Sparc */
1717 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1718 {
1719         int do_print;
1720         unsigned long f;
1721         void (*handler)(void) = do_floppy;
1722
1723         lasthandler = handler;
1724         interruptjiffies = jiffies;
1725
1726         f = claim_dma_lock();
1727         fd_disable_dma();
1728         release_dma_lock(f);
1729
1730         floppy_enable_hlt();
1731         do_floppy = NULL;
1732         if (fdc >= N_FDC || FDCS->address == -1) {
1733                 /* we don't even know which FDC is the culprit */
1734                 pr_info("DOR0=%x\n", fdc_state[0].dor);
1735                 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1736                 pr_info("handler=%pf\n", handler);
1737                 is_alive(__func__, "bizarre fdc");
1738                 return IRQ_NONE;
1739         }
1740
1741         FDCS->reset = 0;
1742         /* We have to clear the reset flag here, because apparently on boxes
1743          * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1744          * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1745          * emission of the SENSEI's.
1746          * It is OK to emit floppy commands because we are in an interrupt
1747          * handler here, and thus we have to fear no interference of other
1748          * activity.
1749          */
1750
1751         do_print = !handler && print_unex && initialized;
1752
1753         inr = result();
1754         if (do_print)
1755                 print_result("unexpected interrupt", inr);
1756         if (inr == 0) {
1757                 int max_sensei = 4;
1758                 do {
1759                         output_byte(FD_SENSEI);
1760                         inr = result();
1761                         if (do_print)
1762                                 print_result("sensei", inr);
1763                         max_sensei--;
1764                 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1765                          inr == 2 && max_sensei);
1766         }
1767         if (!handler) {
1768                 FDCS->reset = 1;
1769                 return IRQ_NONE;
1770         }
1771         schedule_bh(handler);
1772         is_alive(__func__, "normal interrupt end");
1773
1774         /* FIXME! Was it really for us? */
1775         return IRQ_HANDLED;
1776 }
1777
1778 static void recalibrate_floppy(void)
1779 {
1780         debugt(__func__, "");
1781         do_floppy = recal_interrupt;
1782         output_byte(FD_RECALIBRATE);
1783         if (output_byte(UNIT(current_drive)) < 0)
1784                 reset_fdc();
1785 }
1786
1787 /*
1788  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1789  */
1790 static void reset_interrupt(void)
1791 {
1792         debugt(__func__, "");
1793         result();               /* get the status ready for set_fdc */
1794         if (FDCS->reset) {
1795                 pr_info("reset set in interrupt, calling %pf\n", cont->error);
1796                 cont->error();  /* a reset just after a reset. BAD! */
1797         }
1798         cont->redo();
1799 }
1800
1801 /*
1802  * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1803  * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1804  */
1805 static void reset_fdc(void)
1806 {
1807         unsigned long flags;
1808
1809         do_floppy = reset_interrupt;
1810         FDCS->reset = 0;
1811         reset_fdc_info(0);
1812
1813         /* Pseudo-DMA may intercept 'reset finished' interrupt.  */
1814         /* Irrelevant for systems with true DMA (i386).          */
1815
1816         flags = claim_dma_lock();
1817         fd_disable_dma();
1818         release_dma_lock(flags);
1819
1820         if (FDCS->version >= FDC_82072A)
1821                 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1822         else {
1823                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1824                 udelay(FD_RESET_DELAY);
1825                 fd_outb(FDCS->dor, FD_DOR);
1826         }
1827 }
1828
1829 static void show_floppy(void)
1830 {
1831         int i;
1832
1833         pr_info("\n");
1834         pr_info("floppy driver state\n");
1835         pr_info("-------------------\n");
1836         pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1837                 jiffies, interruptjiffies, jiffies - interruptjiffies,
1838                 lasthandler);
1839
1840         pr_info("timeout_message=%s\n", timeout_message);
1841         pr_info("last output bytes:\n");
1842         for (i = 0; i < OLOGSIZE; i++)
1843                 pr_info("%2x %2x %lu\n",
1844                         output_log[(i + output_log_pos) % OLOGSIZE].data,
1845                         output_log[(i + output_log_pos) % OLOGSIZE].status,
1846                         output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1847         pr_info("last result at %lu\n", resultjiffies);
1848         pr_info("last redo_fd_request at %lu\n", lastredo);
1849         print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1850                        reply_buffer, resultsize, true);
1851
1852         pr_info("status=%x\n", fd_inb(FD_STATUS));
1853         pr_info("fdc_busy=%lu\n", fdc_busy);
1854         if (do_floppy)
1855                 pr_info("do_floppy=%pf\n", do_floppy);
1856         if (work_pending(&floppy_work))
1857                 pr_info("floppy_work.func=%pf\n", floppy_work.func);
1858         if (timer_pending(&fd_timer))
1859                 pr_info("fd_timer.function=%pf\n", fd_timer.function);
1860         if (timer_pending(&fd_timeout)) {
1861                 pr_info("timer_function=%pf\n", fd_timeout.function);
1862                 pr_info("expires=%lu\n", fd_timeout.expires - jiffies);
1863                 pr_info("now=%lu\n", jiffies);
1864         }
1865         pr_info("cont=%p\n", cont);
1866         pr_info("current_req=%p\n", current_req);
1867         pr_info("command_status=%d\n", command_status);
1868         pr_info("\n");
1869 }
1870
1871 static void floppy_shutdown(unsigned long data)
1872 {
1873         unsigned long flags;
1874
1875         if (initialized)
1876                 show_floppy();
1877         cancel_activity();
1878
1879         floppy_enable_hlt();
1880
1881         flags = claim_dma_lock();
1882         fd_disable_dma();
1883         release_dma_lock(flags);
1884
1885         /* avoid dma going to a random drive after shutdown */
1886
1887         if (initialized)
1888                 DPRINT("floppy timeout called\n");
1889         FDCS->reset = 1;
1890         if (cont) {
1891                 cont->done(0);
1892                 cont->redo();   /* this will recall reset when needed */
1893         } else {
1894                 pr_info("no cont in shutdown!\n");
1895                 process_fd_request();
1896         }
1897         is_alive(__func__, "");
1898 }
1899
1900 /* start motor, check media-changed condition and write protection */
1901 static int start_motor(void (*function)(void))
1902 {
1903         int mask;
1904         int data;
1905
1906         mask = 0xfc;
1907         data = UNIT(current_drive);
1908         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1909                 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1910                         set_debugt();
1911                         /* no read since this drive is running */
1912                         DRS->first_read_date = 0;
1913                         /* note motor start time if motor is not yet running */
1914                         DRS->spinup_date = jiffies;
1915                         data |= (0x10 << UNIT(current_drive));
1916                 }
1917         } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1918                 mask &= ~(0x10 << UNIT(current_drive));
1919
1920         /* starts motor and selects floppy */
1921         del_timer(motor_off_timer + current_drive);
1922         set_dor(fdc, mask, data);
1923
1924         /* wait_for_completion also schedules reset if needed. */
1925         return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1926                                       (timeout_fn)function);
1927 }
1928
1929 static void floppy_ready(void)
1930 {
1931         if (FDCS->reset) {
1932                 reset_fdc();
1933                 return;
1934         }
1935         if (start_motor(floppy_ready))
1936                 return;
1937         if (fdc_dtr())
1938                 return;
1939
1940         debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1941         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1942             disk_change(current_drive) && !DP->select_delay)
1943                 twaddle();      /* this clears the dcl on certain
1944                                  * drive/controller combinations */
1945
1946 #ifdef fd_chose_dma_mode
1947         if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1948                 unsigned long flags = claim_dma_lock();
1949                 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1950                 release_dma_lock(flags);
1951         }
1952 #endif
1953
1954         if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1955                 perpendicular_mode();
1956                 fdc_specify();  /* must be done here because of hut, hlt ... */
1957                 seek_floppy();
1958         } else {
1959                 if ((raw_cmd->flags & FD_RAW_READ) ||
1960                     (raw_cmd->flags & FD_RAW_WRITE))
1961                         fdc_specify();
1962                 setup_rw_floppy();
1963         }
1964 }
1965
1966 static void floppy_start(void)
1967 {
1968         reschedule_timeout(current_reqD, "floppy start");
1969
1970         scandrives();
1971         debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1972         set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1973         floppy_ready();
1974 }
1975
1976 /*
1977  * ========================================================================
1978  * here ends the bottom half. Exported routines are:
1979  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1980  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1981  * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1982  * and set_dor.
1983  * ========================================================================
1984  */
1985 /*
1986  * General purpose continuations.
1987  * ==============================
1988  */
1989
1990 static void do_wakeup(void)
1991 {
1992         reschedule_timeout(MAXTIMEOUT, "do wakeup");
1993         cont = NULL;
1994         command_status += 2;
1995         wake_up(&command_done);
1996 }
1997
1998 static struct cont_t wakeup_cont = {
1999         .interrupt      = empty,
2000         .redo           = do_wakeup,
2001         .error          = empty,
2002         .done           = (done_f)empty
2003 };
2004
2005 static struct cont_t intr_cont = {
2006         .interrupt      = empty,
2007         .redo           = process_fd_request,
2008         .error          = empty,
2009         .done           = (done_f)empty
2010 };
2011
2012 static int wait_til_done(void (*handler)(void), bool interruptible)
2013 {
2014         int ret;
2015
2016         schedule_bh(handler);
2017
2018         if (command_status < 2 && NO_SIGNAL) {
2019                 DECLARE_WAITQUEUE(wait, current);
2020
2021                 add_wait_queue(&command_done, &wait);
2022                 for (;;) {
2023                         set_current_state(interruptible ?
2024                                           TASK_INTERRUPTIBLE :
2025                                           TASK_UNINTERRUPTIBLE);
2026
2027                         if (command_status >= 2 || !NO_SIGNAL)
2028                                 break;
2029
2030                         is_alive(__func__, "");
2031                         schedule();
2032                 }
2033
2034                 set_current_state(TASK_RUNNING);
2035                 remove_wait_queue(&command_done, &wait);
2036         }
2037
2038         if (command_status < 2) {
2039                 cancel_activity();
2040                 cont = &intr_cont;
2041                 reset_fdc();
2042                 return -EINTR;
2043         }
2044
2045         if (FDCS->reset)
2046                 command_status = FD_COMMAND_ERROR;
2047         if (command_status == FD_COMMAND_OKAY)
2048                 ret = 0;
2049         else
2050                 ret = -EIO;
2051         command_status = FD_COMMAND_NONE;
2052         return ret;
2053 }
2054
2055 static void generic_done(int result)
2056 {
2057         command_status = result;
2058         cont = &wakeup_cont;
2059 }
2060
2061 static void generic_success(void)
2062 {
2063         cont->done(1);
2064 }
2065
2066 static void generic_failure(void)
2067 {
2068         cont->done(0);
2069 }
2070
2071 static void success_and_wakeup(void)
2072 {
2073         generic_success();
2074         cont->redo();
2075 }
2076
2077 /*
2078  * formatting and rw support.
2079  * ==========================
2080  */
2081
2082 static int next_valid_format(void)
2083 {
2084         int probed_format;
2085
2086         probed_format = DRS->probed_format;
2087         while (1) {
2088                 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2089                         DRS->probed_format = 0;
2090                         return 1;
2091                 }
2092                 if (floppy_type[DP->autodetect[probed_format]].sect) {
2093                         DRS->probed_format = probed_format;
2094                         return 0;
2095                 }
2096                 probed_format++;
2097         }
2098 }
2099
2100 static void bad_flp_intr(void)
2101 {
2102         int err_count;
2103
2104         if (probing) {
2105                 DRS->probed_format++;
2106                 if (!next_valid_format())
2107                         return;
2108         }
2109         err_count = ++(*errors);
2110         INFBOUND(DRWE->badness, err_count);
2111         if (err_count > DP->max_errors.abort)
2112                 cont->done(0);
2113         if (err_count > DP->max_errors.reset)
2114                 FDCS->reset = 1;
2115         else if (err_count > DP->max_errors.recal)
2116                 DRS->track = NEED_2_RECAL;
2117 }
2118
2119 static void set_floppy(int drive)
2120 {
2121         int type = ITYPE(UDRS->fd_device);
2122
2123         if (type)
2124                 _floppy = floppy_type + type;
2125         else
2126                 _floppy = current_type[drive];
2127 }
2128
2129 /*
2130  * formatting support.
2131  * ===================
2132  */
2133 static void format_interrupt(void)
2134 {
2135         switch (interpret_errors()) {
2136         case 1:
2137                 cont->error();
2138         case 2:
2139                 break;
2140         case 0:
2141                 cont->done(1);
2142         }
2143         cont->redo();
2144 }
2145
2146 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2147 #define CT(x) ((x) | 0xc0)
2148
2149 static void setup_format_params(int track)
2150 {
2151         int n;
2152         int il;
2153         int count;
2154         int head_shift;
2155         int track_shift;
2156         struct fparm {
2157                 unsigned char track, head, sect, size;
2158         } *here = (struct fparm *)floppy_track_buffer;
2159
2160         raw_cmd = &default_raw_cmd;
2161         raw_cmd->track = track;
2162
2163         raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2164                           FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2165         raw_cmd->rate = _floppy->rate & 0x43;
2166         raw_cmd->cmd_count = NR_F;
2167         COMMAND = FM_MODE(_floppy, FD_FORMAT);
2168         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2169         F_SIZECODE = FD_SIZECODE(_floppy);
2170         F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2171         F_GAP = _floppy->fmt_gap;
2172         F_FILL = FD_FILL_BYTE;
2173
2174         raw_cmd->kernel_data = floppy_track_buffer;
2175         raw_cmd->length = 4 * F_SECT_PER_TRACK;
2176
2177         /* allow for about 30ms for data transport per track */
2178         head_shift = (F_SECT_PER_TRACK + 5) / 6;
2179
2180         /* a ``cylinder'' is two tracks plus a little stepping time */
2181         track_shift = 2 * head_shift + 3;
2182
2183         /* position of logical sector 1 on this track */
2184         n = (track_shift * format_req.track + head_shift * format_req.head)
2185             % F_SECT_PER_TRACK;
2186
2187         /* determine interleave */
2188         il = 1;
2189         if (_floppy->fmt_gap < 0x22)
2190                 il++;
2191
2192         /* initialize field */
2193         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2194                 here[count].track = format_req.track;
2195                 here[count].head = format_req.head;
2196                 here[count].sect = 0;
2197                 here[count].size = F_SIZECODE;
2198         }
2199         /* place logical sectors */
2200         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2201                 here[n].sect = count;
2202                 n = (n + il) % F_SECT_PER_TRACK;
2203                 if (here[n].sect) {     /* sector busy, find next free sector */
2204                         ++n;
2205                         if (n >= F_SECT_PER_TRACK) {
2206                                 n -= F_SECT_PER_TRACK;
2207                                 while (here[n].sect)
2208                                         ++n;
2209                         }
2210                 }
2211         }
2212         if (_floppy->stretch & FD_SECTBASEMASK) {
2213                 for (count = 0; count < F_SECT_PER_TRACK; count++)
2214                         here[count].sect += FD_SECTBASE(_floppy) - 1;
2215         }
2216 }
2217
2218 static void redo_format(void)
2219 {
2220         buffer_track = -1;
2221         setup_format_params(format_req.track << STRETCH(_floppy));
2222         floppy_start();
2223         debugt(__func__, "queue format request");
2224 }
2225
2226 static struct cont_t format_cont = {
2227         .interrupt      = format_interrupt,
2228         .redo           = redo_format,
2229         .error          = bad_flp_intr,
2230         .done           = generic_done
2231 };
2232
2233 static int do_format(int drive, struct format_descr *tmp_format_req)
2234 {
2235         int ret;
2236
2237         if (lock_fdc(drive, true))
2238                 return -EINTR;
2239
2240         set_floppy(drive);
2241         if (!_floppy ||
2242             _floppy->track > DP->tracks ||
2243             tmp_format_req->track >= _floppy->track ||
2244             tmp_format_req->head >= _floppy->head ||
2245             (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2246             !_floppy->fmt_gap) {
2247                 process_fd_request();
2248                 return -EINVAL;
2249         }
2250         format_req = *tmp_format_req;
2251         format_errors = 0;
2252         cont = &format_cont;
2253         errors = &format_errors;
2254         ret = wait_til_done(redo_format, true);
2255         if (ret == -EINTR)
2256                 return -EINTR;
2257         process_fd_request();
2258         return ret;
2259 }
2260
2261 /*
2262  * Buffer read/write and support
2263  * =============================
2264  */
2265
2266 static void floppy_end_request(struct request *req, int error)
2267 {
2268         unsigned int nr_sectors = current_count_sectors;
2269         unsigned int drive = (unsigned long)req->rq_disk->private_data;
2270
2271         /* current_count_sectors can be zero if transfer failed */
2272         if (error)
2273                 nr_sectors = blk_rq_cur_sectors(req);
2274         if (__blk_end_request(req, error, nr_sectors << 9))
2275                 return;
2276
2277         /* We're done with the request */
2278         floppy_off(drive);
2279         current_req = NULL;
2280 }
2281
2282 /* new request_done. Can handle physical sectors which are smaller than a
2283  * logical buffer */
2284 static void request_done(int uptodate)
2285 {
2286         struct request_queue *q = floppy_queue;
2287         struct request *req = current_req;
2288         unsigned long flags;
2289         int block;
2290         char msg[sizeof("request done ") + sizeof(int) * 3];
2291
2292         probing = 0;
2293         snprintf(msg, sizeof(msg), "request done %d", uptodate);
2294         reschedule_timeout(MAXTIMEOUT, msg);
2295
2296         if (!req) {
2297                 pr_info("floppy.c: no request in request_done\n");
2298                 return;
2299         }
2300
2301         if (uptodate) {
2302                 /* maintain values for invalidation on geometry
2303                  * change */
2304                 block = current_count_sectors + blk_rq_pos(req);
2305                 INFBOUND(DRS->maxblock, block);
2306                 if (block > _floppy->sect)
2307                         DRS->maxtrack = 1;
2308
2309                 /* unlock chained buffers */
2310                 spin_lock_irqsave(q->queue_lock, flags);
2311                 floppy_end_request(req, 0);
2312                 spin_unlock_irqrestore(q->queue_lock, flags);
2313         } else {
2314                 if (rq_data_dir(req) == WRITE) {
2315                         /* record write error information */
2316                         DRWE->write_errors++;
2317                         if (DRWE->write_errors == 1) {
2318                                 DRWE->first_error_sector = blk_rq_pos(req);
2319                                 DRWE->first_error_generation = DRS->generation;
2320                         }
2321                         DRWE->last_error_sector = blk_rq_pos(req);
2322                         DRWE->last_error_generation = DRS->generation;
2323                 }
2324                 spin_lock_irqsave(q->queue_lock, flags);
2325                 floppy_end_request(req, -EIO);
2326                 spin_unlock_irqrestore(q->queue_lock, flags);
2327         }
2328 }
2329
2330 /* Interrupt handler evaluating the result of the r/w operation */
2331 static void rw_interrupt(void)
2332 {
2333         int eoc;
2334         int ssize;
2335         int heads;
2336         int nr_sectors;
2337
2338         if (R_HEAD >= 2) {
2339                 /* some Toshiba floppy controllers occasionnally seem to
2340                  * return bogus interrupts after read/write operations, which
2341                  * can be recognized by a bad head number (>= 2) */
2342                 return;
2343         }
2344
2345         if (!DRS->first_read_date)
2346                 DRS->first_read_date = jiffies;
2347
2348         nr_sectors = 0;
2349         ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2350
2351         if (ST1 & ST1_EOC)
2352                 eoc = 1;
2353         else
2354                 eoc = 0;
2355
2356         if (COMMAND & 0x80)
2357                 heads = 2;
2358         else
2359                 heads = 1;
2360
2361         nr_sectors = (((R_TRACK - TRACK) * heads +
2362                        R_HEAD - HEAD) * SECT_PER_TRACK +
2363                       R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2364
2365         if (nr_sectors / ssize >
2366             DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2367                 DPRINT("long rw: %x instead of %lx\n",
2368                        nr_sectors, current_count_sectors);
2369                 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2370                 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2371                 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2372                 pr_info("heads=%d eoc=%d\n", heads, eoc);
2373                 pr_info("spt=%d st=%d ss=%d\n",
2374                         SECT_PER_TRACK, fsector_t, ssize);
2375                 pr_info("in_sector_offset=%d\n", in_sector_offset);
2376         }
2377
2378         nr_sectors -= in_sector_offset;
2379         INFBOUND(nr_sectors, 0);
2380         SUPBOUND(current_count_sectors, nr_sectors);
2381
2382         switch (interpret_errors()) {
2383         case 2:
2384                 cont->redo();
2385                 return;
2386         case 1:
2387                 if (!current_count_sectors) {
2388                         cont->error();
2389                         cont->redo();
2390                         return;
2391                 }
2392                 break;
2393         case 0:
2394                 if (!current_count_sectors) {
2395                         cont->redo();
2396                         return;
2397                 }
2398                 current_type[current_drive] = _floppy;
2399                 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2400                 break;
2401         }
2402
2403         if (probing) {
2404                 if (DP->flags & FTD_MSG)
2405                         DPRINT("Auto-detected floppy type %s in fd%d\n",
2406                                _floppy->name, current_drive);
2407                 current_type[current_drive] = _floppy;
2408                 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2409                 probing = 0;
2410         }
2411
2412         if (CT(COMMAND) != FD_READ ||
2413             raw_cmd->kernel_data == current_req->buffer) {
2414                 /* transfer directly from buffer */
2415                 cont->done(1);
2416         } else if (CT(COMMAND) == FD_READ) {
2417                 buffer_track = raw_cmd->track;
2418                 buffer_drive = current_drive;
2419                 INFBOUND(buffer_max, nr_sectors + fsector_t);
2420         }
2421         cont->redo();
2422 }
2423
2424 /* Compute maximal contiguous buffer size. */
2425 static int buffer_chain_size(void)
2426 {
2427         struct bio_vec *bv;
2428         int size;
2429         struct req_iterator iter;
2430         char *base;
2431
2432         base = bio_data(current_req->bio);
2433         size = 0;
2434
2435         rq_for_each_segment(bv, current_req, iter) {
2436                 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2437                         break;
2438
2439                 size += bv->bv_len;
2440         }
2441
2442         return size >> 9;
2443 }
2444
2445 /* Compute the maximal transfer size */
2446 static int transfer_size(int ssize, int max_sector, int max_size)
2447 {
2448         SUPBOUND(max_sector, fsector_t + max_size);
2449
2450         /* alignment */
2451         max_sector -= (max_sector % _floppy->sect) % ssize;
2452
2453         /* transfer size, beginning not aligned */
2454         current_count_sectors = max_sector - fsector_t;
2455
2456         return max_sector;
2457 }
2458
2459 /*
2460  * Move data from/to the track buffer to/from the buffer cache.
2461  */
2462 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2463 {
2464         int remaining;          /* number of transferred 512-byte sectors */
2465         struct bio_vec *bv;
2466         char *buffer;
2467         char *dma_buffer;
2468         int size;
2469         struct req_iterator iter;
2470
2471         max_sector = transfer_size(ssize,
2472                                    min(max_sector, max_sector_2),
2473                                    blk_rq_sectors(current_req));
2474
2475         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2476             buffer_max > fsector_t + blk_rq_sectors(current_req))
2477                 current_count_sectors = min_t(int, buffer_max - fsector_t,
2478                                               blk_rq_sectors(current_req));
2479
2480         remaining = current_count_sectors << 9;
2481         if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2482                 DPRINT("in copy buffer\n");
2483                 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2484                 pr_info("remaining=%d\n", remaining >> 9);
2485                 pr_info("current_req->nr_sectors=%u\n",
2486                         blk_rq_sectors(current_req));
2487                 pr_info("current_req->current_nr_sectors=%u\n",
2488                         blk_rq_cur_sectors(current_req));
2489                 pr_info("max_sector=%d\n", max_sector);
2490                 pr_info("ssize=%d\n", ssize);
2491         }
2492
2493         buffer_max = max(max_sector, buffer_max);
2494
2495         dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2496
2497         size = blk_rq_cur_bytes(current_req);
2498
2499         rq_for_each_segment(bv, current_req, iter) {
2500                 if (!remaining)
2501                         break;
2502
2503                 size = bv->bv_len;
2504                 SUPBOUND(size, remaining);
2505
2506                 buffer = page_address(bv->bv_page) + bv->bv_offset;
2507                 if (dma_buffer + size >
2508                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2509                     dma_buffer < floppy_track_buffer) {
2510                         DPRINT("buffer overrun in copy buffer %d\n",
2511                                (int)((floppy_track_buffer - dma_buffer) >> 9));
2512                         pr_info("fsector_t=%d buffer_min=%d\n",
2513                                 fsector_t, buffer_min);
2514                         pr_info("current_count_sectors=%ld\n",
2515                                 current_count_sectors);
2516                         if (CT(COMMAND) == FD_READ)
2517                                 pr_info("read\n");
2518                         if (CT(COMMAND) == FD_WRITE)
2519                                 pr_info("write\n");
2520                         break;
2521                 }
2522                 if (((unsigned long)buffer) % 512)
2523                         DPRINT("%p buffer not aligned\n", buffer);
2524
2525                 if (CT(COMMAND) == FD_READ)
2526                         memcpy(buffer, dma_buffer, size);
2527                 else
2528                         memcpy(dma_buffer, buffer, size);
2529
2530                 remaining -= size;
2531                 dma_buffer += size;
2532         }
2533         if (remaining) {
2534                 if (remaining > 0)
2535                         max_sector -= remaining >> 9;
2536                 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2537         }
2538 }
2539
2540 /* work around a bug in pseudo DMA
2541  * (on some FDCs) pseudo DMA does not stop when the CPU stops
2542  * sending data.  Hence we need a different way to signal the
2543  * transfer length:  We use SECT_PER_TRACK.  Unfortunately, this
2544  * does not work with MT, hence we can only transfer one head at
2545  * a time
2546  */
2547 static void virtualdmabug_workaround(void)
2548 {
2549         int hard_sectors;
2550         int end_sector;
2551
2552         if (CT(COMMAND) == FD_WRITE) {
2553                 COMMAND &= ~0x80;       /* switch off multiple track mode */
2554
2555                 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2556                 end_sector = SECTOR + hard_sectors - 1;
2557                 if (end_sector > SECT_PER_TRACK) {
2558                         pr_info("too many sectors %d > %d\n",
2559                                 end_sector, SECT_PER_TRACK);
2560                         return;
2561                 }
2562                 SECT_PER_TRACK = end_sector;
2563                                         /* make sure SECT_PER_TRACK
2564                                          * points to end of transfer */
2565         }
2566 }
2567
2568 /*
2569  * Formulate a read/write request.
2570  * this routine decides where to load the data (directly to buffer, or to
2571  * tmp floppy area), how much data to load (the size of the buffer, the whole
2572  * track, or a single sector)
2573  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2574  * allocation on the fly, it should be done here. No other part should need
2575  * modification.
2576  */
2577
2578 static int make_raw_rw_request(void)
2579 {
2580         int aligned_sector_t;
2581         int max_sector;
2582         int max_size;
2583         int tracksize;
2584         int ssize;
2585
2586         if (max_buffer_sectors == 0) {
2587                 pr_info("VFS: Block I/O scheduled on unopened device\n");
2588                 return 0;
2589         }
2590
2591         set_fdc((long)current_req->rq_disk->private_data);
2592
2593         raw_cmd = &default_raw_cmd;
2594         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2595             FD_RAW_NEED_SEEK;
2596         raw_cmd->cmd_count = NR_RW;
2597         if (rq_data_dir(current_req) == READ) {
2598                 raw_cmd->flags |= FD_RAW_READ;
2599                 COMMAND = FM_MODE(_floppy, FD_READ);
2600         } else if (rq_data_dir(current_req) == WRITE) {
2601                 raw_cmd->flags |= FD_RAW_WRITE;
2602                 COMMAND = FM_MODE(_floppy, FD_WRITE);
2603         } else {
2604                 DPRINT("%s: unknown command\n", __func__);
2605                 return 0;
2606         }
2607
2608         max_sector = _floppy->sect * _floppy->head;
2609
2610         TRACK = (int)blk_rq_pos(current_req) / max_sector;
2611         fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2612         if (_floppy->track && TRACK >= _floppy->track) {
2613                 if (blk_rq_cur_sectors(current_req) & 1) {
2614                         current_count_sectors = 1;
2615                         return 1;
2616                 } else
2617                         return 0;
2618         }
2619         HEAD = fsector_t / _floppy->sect;
2620
2621         if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2622              test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2623             fsector_t < _floppy->sect)
2624                 max_sector = _floppy->sect;
2625
2626         /* 2M disks have phantom sectors on the first track */
2627         if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2628                 max_sector = 2 * _floppy->sect / 3;
2629                 if (fsector_t >= max_sector) {
2630                         current_count_sectors =
2631                             min_t(int, _floppy->sect - fsector_t,
2632                                   blk_rq_sectors(current_req));
2633                         return 1;
2634                 }
2635                 SIZECODE = 2;
2636         } else
2637                 SIZECODE = FD_SIZECODE(_floppy);
2638         raw_cmd->rate = _floppy->rate & 0x43;
2639         if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2640                 raw_cmd->rate = 1;
2641
2642         if (SIZECODE)
2643                 SIZECODE2 = 0xff;
2644         else
2645                 SIZECODE2 = 0x80;
2646         raw_cmd->track = TRACK << STRETCH(_floppy);
2647         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2648         GAP = _floppy->gap;
2649         ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2650         SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2651         SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2652             FD_SECTBASE(_floppy);
2653
2654         /* tracksize describes the size which can be filled up with sectors
2655          * of size ssize.
2656          */
2657         tracksize = _floppy->sect - _floppy->sect % ssize;
2658         if (tracksize < _floppy->sect) {
2659                 SECT_PER_TRACK++;
2660                 if (tracksize <= fsector_t % _floppy->sect)
2661                         SECTOR--;
2662
2663                 /* if we are beyond tracksize, fill up using smaller sectors */
2664                 while (tracksize <= fsector_t % _floppy->sect) {
2665                         while (tracksize + ssize > _floppy->sect) {
2666                                 SIZECODE--;
2667                                 ssize >>= 1;
2668                         }
2669                         SECTOR++;
2670                         SECT_PER_TRACK++;
2671                         tracksize += ssize;
2672                 }
2673                 max_sector = HEAD * _floppy->sect + tracksize;
2674         } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2675                 max_sector = _floppy->sect;
2676         } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2677                 /* for virtual DMA bug workaround */
2678                 max_sector = _floppy->sect;
2679         }
2680
2681         in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2682         aligned_sector_t = fsector_t - in_sector_offset;
2683         max_size = blk_rq_sectors(current_req);
2684         if ((raw_cmd->track == buffer_track) &&
2685             (current_drive == buffer_drive) &&
2686             (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2687                 /* data already in track buffer */
2688                 if (CT(COMMAND) == FD_READ) {
2689                         copy_buffer(1, max_sector, buffer_max);
2690                         return 1;
2691                 }
2692         } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2693                 if (CT(COMMAND) == FD_WRITE) {
2694                         unsigned int sectors;
2695
2696                         sectors = fsector_t + blk_rq_sectors(current_req);
2697                         if (sectors > ssize && sectors < ssize + ssize)
2698                                 max_size = ssize + ssize;
2699                         else
2700                                 max_size = ssize;
2701                 }
2702                 raw_cmd->flags &= ~FD_RAW_WRITE;
2703                 raw_cmd->flags |= FD_RAW_READ;
2704                 COMMAND = FM_MODE(_floppy, FD_READ);
2705         } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2706                 unsigned long dma_limit;
2707                 int direct, indirect;
2708
2709                 indirect =
2710                     transfer_size(ssize, max_sector,
2711                                   max_buffer_sectors * 2) - fsector_t;
2712
2713                 /*
2714                  * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2715                  * on a 64 bit machine!
2716                  */
2717                 max_size = buffer_chain_size();
2718                 dma_limit = (MAX_DMA_ADDRESS -
2719                              ((unsigned long)current_req->buffer)) >> 9;
2720                 if ((unsigned long)max_size > dma_limit)
2721                         max_size = dma_limit;
2722                 /* 64 kb boundaries */
2723                 if (CROSS_64KB(current_req->buffer, max_size << 9))
2724                         max_size = (K_64 -
2725                                     ((unsigned long)current_req->buffer) %
2726                                     K_64) >> 9;
2727                 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2728                 /*
2729                  * We try to read tracks, but if we get too many errors, we
2730                  * go back to reading just one sector at a time.
2731                  *
2732                  * This means we should be able to read a sector even if there
2733                  * are other bad sectors on this track.
2734                  */
2735                 if (!direct ||
2736                     (indirect * 2 > direct * 3 &&
2737                      *errors < DP->max_errors.read_track &&
2738                      ((!probing ||
2739                        (DP->read_track & (1 << DRS->probed_format)))))) {
2740                         max_size = blk_rq_sectors(current_req);
2741                 } else {
2742                         raw_cmd->kernel_data = current_req->buffer;
2743                         raw_cmd->length = current_count_sectors << 9;
2744                         if (raw_cmd->length == 0) {
2745                                 DPRINT("%s: zero dma transfer attempted\n", __func__);
2746                                 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2747                                        indirect, direct, fsector_t);
2748                                 return 0;
2749                         }
2750                         virtualdmabug_workaround();
2751                         return 2;
2752                 }
2753         }
2754
2755         if (CT(COMMAND) == FD_READ)
2756                 max_size = max_sector;  /* unbounded */
2757
2758         /* claim buffer track if needed */
2759         if (buffer_track != raw_cmd->track ||   /* bad track */
2760             buffer_drive != current_drive ||    /* bad drive */
2761             fsector_t > buffer_max ||
2762             fsector_t < buffer_min ||
2763             ((CT(COMMAND) == FD_READ ||
2764               (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2765              max_sector > 2 * max_buffer_sectors + buffer_min &&
2766              max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2767                 /* not enough space */
2768                 buffer_track = -1;
2769                 buffer_drive = current_drive;
2770                 buffer_max = buffer_min = aligned_sector_t;
2771         }
2772         raw_cmd->kernel_data = floppy_track_buffer +
2773                 ((aligned_sector_t - buffer_min) << 9);
2774
2775         if (CT(COMMAND) == FD_WRITE) {
2776                 /* copy write buffer to track buffer.
2777                  * if we get here, we know that the write
2778                  * is either aligned or the data already in the buffer
2779                  * (buffer will be overwritten) */
2780                 if (in_sector_offset && buffer_track == -1)
2781                         DPRINT("internal error offset !=0 on write\n");
2782                 buffer_track = raw_cmd->track;
2783                 buffer_drive = current_drive;
2784                 copy_buffer(ssize, max_sector,
2785                             2 * max_buffer_sectors + buffer_min);
2786         } else
2787                 transfer_size(ssize, max_sector,
2788                               2 * max_buffer_sectors + buffer_min -
2789                               aligned_sector_t);
2790
2791         /* round up current_count_sectors to get dma xfer size */
2792         raw_cmd->length = in_sector_offset + current_count_sectors;
2793         raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2794         raw_cmd->length <<= 9;
2795         if ((raw_cmd->length < current_count_sectors << 9) ||
2796             (raw_cmd->kernel_data != current_req->buffer &&
2797              CT(COMMAND) == FD_WRITE &&
2798              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2799               aligned_sector_t < buffer_min)) ||
2800             raw_cmd->length % (128 << SIZECODE) ||
2801             raw_cmd->length <= 0 || current_count_sectors <= 0) {
2802                 DPRINT("fractionary current count b=%lx s=%lx\n",
2803                        raw_cmd->length, current_count_sectors);
2804                 if (raw_cmd->kernel_data != current_req->buffer)
2805                         pr_info("addr=%d, length=%ld\n",
2806                                 (int)((raw_cmd->kernel_data -
2807                                        floppy_track_buffer) >> 9),
2808                                 current_count_sectors);
2809                 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2810                         fsector_t, aligned_sector_t, max_sector, max_size);
2811                 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2812                 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2813                         COMMAND, SECTOR, HEAD, TRACK);
2814                 pr_info("buffer drive=%d\n", buffer_drive);
2815                 pr_info("buffer track=%d\n", buffer_track);
2816                 pr_info("buffer_min=%d\n", buffer_min);
2817                 pr_info("buffer_max=%d\n", buffer_max);
2818                 return 0;
2819         }
2820
2821         if (raw_cmd->kernel_data != current_req->buffer) {
2822                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2823                     current_count_sectors < 0 ||
2824                     raw_cmd->length < 0 ||
2825                     raw_cmd->kernel_data + raw_cmd->length >
2826                     floppy_track_buffer + (max_buffer_sectors << 10)) {
2827                         DPRINT("buffer overrun in schedule dma\n");
2828                         pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2829                                 fsector_t, buffer_min, raw_cmd->length >> 9);
2830                         pr_info("current_count_sectors=%ld\n",
2831                                 current_count_sectors);
2832                         if (CT(COMMAND) == FD_READ)
2833                                 pr_info("read\n");
2834                         if (CT(COMMAND) == FD_WRITE)
2835                                 pr_info("write\n");
2836                         return 0;
2837                 }
2838         } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2839                    current_count_sectors > blk_rq_sectors(current_req)) {
2840                 DPRINT("buffer overrun in direct transfer\n");
2841                 return 0;
2842         } else if (raw_cmd->length < current_count_sectors << 9) {
2843                 DPRINT("more sectors than bytes\n");
2844                 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2845                 pr_info("sectors=%ld\n", current_count_sectors);
2846         }
2847         if (raw_cmd->length == 0) {
2848                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2849                 return 0;
2850         }
2851
2852         virtualdmabug_workaround();
2853         return 2;
2854 }
2855
2856 static void redo_fd_request(void)
2857 {
2858         int drive;
2859         int tmp;
2860
2861         lastredo = jiffies;
2862         if (current_drive < N_DRIVE)
2863                 floppy_off(current_drive);
2864
2865 do_request:
2866         if (!current_req) {
2867                 struct request *req;
2868
2869                 spin_lock_irq(floppy_queue->queue_lock);
2870                 req = blk_fetch_request(floppy_queue);
2871                 spin_unlock_irq(floppy_queue->queue_lock);
2872                 if (!req) {
2873                         do_floppy = NULL;
2874                         unlock_fdc();
2875                         return;
2876                 }
2877                 current_req = req;
2878         }
2879         drive = (long)current_req->rq_disk->private_data;
2880         set_fdc(drive);
2881         reschedule_timeout(current_reqD, "redo fd request");
2882
2883         set_floppy(drive);
2884         raw_cmd = &default_raw_cmd;
2885         raw_cmd->flags = 0;
2886         if (start_motor(redo_fd_request))
2887                 return;
2888
2889         disk_change(current_drive);
2890         if (test_bit(current_drive, &fake_change) ||
2891             test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2892                 DPRINT("disk absent or changed during operation\n");
2893                 request_done(0);
2894                 goto do_request;
2895         }
2896         if (!_floppy) { /* Autodetection */
2897                 if (!probing) {
2898                         DRS->probed_format = 0;
2899                         if (next_valid_format()) {
2900                                 DPRINT("no autodetectable formats\n");
2901                                 _floppy = NULL;
2902                                 request_done(0);
2903                                 goto do_request;
2904                         }
2905                 }
2906                 probing = 1;
2907                 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2908         } else
2909                 probing = 0;
2910         errors = &(current_req->errors);
2911         tmp = make_raw_rw_request();
2912         if (tmp < 2) {
2913                 request_done(tmp);
2914                 goto do_request;
2915         }
2916
2917         if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2918                 twaddle();
2919         schedule_bh(floppy_start);
2920         debugt(__func__, "queue fd request");
2921         return;
2922 }
2923
2924 static struct cont_t rw_cont = {
2925         .interrupt      = rw_interrupt,
2926         .redo           = redo_fd_request,
2927         .error          = bad_flp_intr,
2928         .done           = request_done
2929 };
2930
2931 static void process_fd_request(void)
2932 {
2933         cont = &rw_cont;
2934         schedule_bh(redo_fd_request);
2935 }
2936
2937 static void do_fd_request(struct request_queue *q)
2938 {
2939         if (max_buffer_sectors == 0) {
2940                 pr_info("VFS: %s called on non-open device\n", __func__);
2941                 return;
2942         }
2943
2944         if (usage_count == 0) {
2945                 pr_info("warning: usage count=0, current_req=%p exiting\n",
2946                         current_req);
2947                 pr_info("sect=%ld type=%x flags=%x\n",
2948                         (long)blk_rq_pos(current_req), current_req->cmd_type,
2949                         current_req->cmd_flags);
2950                 return;
2951         }
2952         if (test_bit(0, &fdc_busy)) {
2953                 /* fdc busy, this new request will be treated when the
2954                    current one is done */
2955                 is_alive(__func__, "old request running");
2956                 return;
2957         }
2958         lock_fdc(MAXTIMEOUT, false);
2959         process_fd_request();
2960         is_alive(__func__, "");
2961 }
2962
2963 static struct cont_t poll_cont = {
2964         .interrupt      = success_and_wakeup,
2965         .redo           = floppy_ready,
2966         .error          = generic_failure,
2967         .done           = generic_done
2968 };
2969
2970 static int poll_drive(bool interruptible, int flag)
2971 {
2972         /* no auto-sense, just clear dcl */
2973         raw_cmd = &default_raw_cmd;
2974         raw_cmd->flags = flag;
2975         raw_cmd->track = 0;
2976         raw_cmd->cmd_count = 0;
2977         cont = &poll_cont;
2978         debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2979         set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2980
2981         return wait_til_done(floppy_ready, interruptible);
2982 }
2983
2984 /*
2985  * User triggered reset
2986  * ====================
2987  */
2988
2989 static void reset_intr(void)
2990 {
2991         pr_info("weird, reset interrupt called\n");
2992 }
2993
2994 static struct cont_t reset_cont = {
2995         .interrupt      = reset_intr,
2996         .redo           = success_and_wakeup,
2997         .error          = generic_failure,
2998         .done           = generic_done
2999 };
3000
3001 static int user_reset_fdc(int drive, int arg, bool interruptible)
3002 {
3003         int ret;
3004
3005         if (lock_fdc(drive, interruptible))
3006                 return -EINTR;
3007
3008         if (arg == FD_RESET_ALWAYS)
3009                 FDCS->reset = 1;
3010         if (FDCS->reset) {
3011                 cont = &reset_cont;
3012                 ret = wait_til_done(reset_fdc, interruptible);
3013                 if (ret == -EINTR)
3014                         return -EINTR;
3015         }
3016         process_fd_request();
3017         return 0;
3018 }
3019
3020 /*
3021  * Misc Ioctl's and support
3022  * ========================
3023  */
3024 static inline int fd_copyout(void __user *param, const void *address,
3025                              unsigned long size)
3026 {
3027         return copy_to_user(param, address, size) ? -EFAULT : 0;
3028 }
3029
3030 static inline int fd_copyin(void __user *param, void *address,
3031                             unsigned long size)
3032 {
3033         return copy_from_user(address, param, size) ? -EFAULT : 0;
3034 }
3035
3036 static inline const char *drive_name(int type, int drive)
3037 {
3038         struct floppy_struct *floppy;
3039
3040         if (type)
3041                 floppy = floppy_type + type;
3042         else {
3043                 if (UDP->native_format)
3044                         floppy = floppy_type + UDP->native_format;
3045                 else
3046                         return "(null)";
3047         }
3048         if (floppy->name)
3049                 return floppy->name;
3050         else
3051                 return "(null)";
3052 }
3053
3054 /* raw commands */
3055 static void raw_cmd_done(int flag)
3056 {
3057         int i;
3058
3059         if (!flag) {
3060                 raw_cmd->flags |= FD_RAW_FAILURE;
3061                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3062         } else {
3063                 raw_cmd->reply_count = inr;
3064                 if (raw_cmd->reply_count > MAX_REPLIES)
3065                         raw_cmd->reply_count = 0;
3066                 for (i = 0; i < raw_cmd->reply_count; i++)
3067                         raw_cmd->reply[i] = reply_buffer[i];
3068
3069                 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3070                         unsigned long flags;
3071                         flags = claim_dma_lock();
3072                         raw_cmd->length = fd_get_dma_residue();
3073                         release_dma_lock(flags);
3074                 }
3075
3076                 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3077                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3078                         raw_cmd->flags |= FD_RAW_FAILURE;
3079
3080                 if (disk_change(current_drive))
3081                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3082                 else
3083                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3084                 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3085                         motor_off_callback(current_drive);
3086
3087                 if (raw_cmd->next &&
3088                     (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3089                      !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3090                     ((raw_cmd->flags & FD_RAW_FAILURE) ||
3091                      !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3092                         raw_cmd = raw_cmd->next;
3093                         return;
3094                 }
3095         }
3096         generic_done(flag);
3097 }
3098
3099 static struct cont_t raw_cmd_cont = {
3100         .interrupt      = success_and_wakeup,
3101         .redo           = floppy_start,
3102         .error          = generic_failure,
3103         .done           = raw_cmd_done
3104 };
3105
3106 static inline int raw_cmd_copyout(int cmd, void __user *param,
3107                                   struct floppy_raw_cmd *ptr)
3108 {
3109         int ret;
3110
3111         while (ptr) {
3112                 ret = copy_to_user(param, ptr, sizeof(*ptr));
3113                 if (ret)
3114                         return -EFAULT;
3115                 param += sizeof(struct floppy_raw_cmd);
3116                 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3117                         if (ptr->length >= 0 &&
3118                             ptr->length <= ptr->buffer_length) {
3119                                 long length = ptr->buffer_length - ptr->length;
3120                                 ret = fd_copyout(ptr->data, ptr->kernel_data,
3121                                                  length);
3122                                 if (ret)
3123                                         return ret;
3124                         }
3125                 }
3126                 ptr = ptr->next;
3127         }
3128
3129         return 0;
3130 }
3131
3132 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3133 {
3134         struct floppy_raw_cmd *next;
3135         struct floppy_raw_cmd *this;
3136
3137         this = *ptr;
3138         *ptr = NULL;
3139         while (this) {
3140                 if (this->buffer_length) {
3141                         fd_dma_mem_free((unsigned long)this->kernel_data,
3142                                         this->buffer_length);
3143                         this->buffer_length = 0;
3144                 }
3145                 next = this->next;
3146                 kfree(this);
3147                 this = next;
3148         }
3149 }
3150
3151 static inline int raw_cmd_copyin(int cmd, void __user *param,
3152                                  struct floppy_raw_cmd **rcmd)
3153 {
3154         struct floppy_raw_cmd *ptr;
3155         int ret;
3156         int i;
3157
3158         *rcmd = NULL;
3159
3160 loop:
3161         ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3162         if (!ptr)
3163                 return -ENOMEM;
3164         *rcmd = ptr;
3165         ret = copy_from_user(ptr, param, sizeof(*ptr));
3166         if (ret)
3167                 return -EFAULT;
3168         ptr->next = NULL;
3169         ptr->buffer_length = 0;
3170         param += sizeof(struct floppy_raw_cmd);
3171         if (ptr->cmd_count > 33)
3172                         /* the command may now also take up the space
3173                          * initially intended for the reply & the
3174                          * reply count. Needed for long 82078 commands
3175                          * such as RESTORE, which takes ... 17 command
3176                          * bytes. Murphy's law #137: When you reserve
3177                          * 16 bytes for a structure, you'll one day
3178                          * discover that you really need 17...
3179                          */
3180                 return -EINVAL;
3181
3182         for (i = 0; i < 16; i++)
3183                 ptr->reply[i] = 0;
3184         ptr->resultcode = 0;
3185         ptr->kernel_data = NULL;
3186
3187         if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3188                 if (ptr->length <= 0)
3189                         return -EINVAL;
3190                 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3191                 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3192                 if (!ptr->kernel_data)
3193                         return -ENOMEM;
3194                 ptr->buffer_length = ptr->length;
3195         }
3196         if (ptr->flags & FD_RAW_WRITE) {
3197                 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3198                 if (ret)
3199                         return ret;
3200         }
3201
3202         if (ptr->flags & FD_RAW_MORE) {
3203                 rcmd = &(ptr->next);
3204                 ptr->rate &= 0x43;
3205                 goto loop;
3206         }
3207
3208         return 0;
3209 }
3210
3211 static int raw_cmd_ioctl(int cmd, void __user *param)
3212 {
3213         struct floppy_raw_cmd *my_raw_cmd;
3214         int drive;
3215         int ret2;
3216         int ret;
3217
3218         if (FDCS->rawcmd <= 1)
3219                 FDCS->rawcmd = 1;
3220         for (drive = 0; drive < N_DRIVE; drive++) {
3221                 if (FDC(drive) != fdc)
3222                         continue;
3223                 if (drive == current_drive) {
3224                         if (UDRS->fd_ref > 1) {
3225                                 FDCS->rawcmd = 2;
3226                                 break;
3227                         }
3228                 } else if (UDRS->fd_ref) {
3229                         FDCS->rawcmd = 2;
3230                         break;
3231                 }
3232         }
3233
3234         if (FDCS->reset)
3235                 return -EIO;
3236
3237         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3238         if (ret) {
3239                 raw_cmd_free(&my_raw_cmd);
3240                 return ret;
3241         }
3242
3243         raw_cmd = my_raw_cmd;
3244         cont = &raw_cmd_cont;
3245         ret = wait_til_done(floppy_start, true);
3246         debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3247
3248         if (ret != -EINTR && FDCS->reset)
3249                 ret = -EIO;
3250
3251         DRS->track = NO_TRACK;
3252
3253         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3254         if (!ret)
3255                 ret = ret2;
3256         raw_cmd_free(&my_raw_cmd);
3257         return ret;
3258 }
3259
3260 static int invalidate_drive(struct block_device *bdev)
3261 {
3262         /* invalidate the buffer track to force a reread */
3263         set_bit((long)bdev->bd_disk->private_data, &fake_change);
3264         process_fd_request();
3265         check_disk_change(bdev);
3266         return 0;
3267 }
3268
3269 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
3270                                int drive, int type, struct block_device *bdev)
3271 {
3272         int cnt;
3273
3274         /* sanity checking for parameters. */
3275         if (g->sect <= 0 ||
3276             g->head <= 0 ||
3277             g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3278             /* check if reserved bits are set */
3279             (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3280                 return -EINVAL;
3281         if (type) {
3282                 if (!capable(CAP_SYS_ADMIN))
3283                         return -EPERM;
3284                 mutex_lock(&open_lock);
3285                 if (lock_fdc(drive, true)) {
3286                         mutex_unlock(&open_lock);
3287                         return -EINTR;
3288                 }
3289                 floppy_type[type] = *g;
3290                 floppy_type[type].name = "user format";
3291                 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3292                         floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3293                             floppy_type[type].size + 1;
3294                 process_fd_request();
3295                 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3296                         struct block_device *bdev = opened_bdev[cnt];
3297                         if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3298                                 continue;
3299                         __invalidate_device(bdev);
3300                 }
3301                 mutex_unlock(&open_lock);
3302         } else {
3303                 int oldStretch;
3304
3305                 if (lock_fdc(drive, true))
3306                         return -EINTR;
3307                 if (cmd != FDDEFPRM) {
3308                         /* notice a disk change immediately, else
3309                          * we lose our settings immediately*/
3310                         if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3311                                 return -EINTR;
3312                 }
3313                 oldStretch = g->stretch;
3314                 user_params[drive] = *g;
3315                 if (buffer_drive == drive)
3316                         SUPBOUND(buffer_max, user_params[drive].sect);
3317                 current_type[drive] = &user_params[drive];
3318                 floppy_sizes[drive] = user_params[drive].size;
3319                 if (cmd == FDDEFPRM)
3320                         DRS->keep_data = -1;
3321                 else
3322                         DRS->keep_data = 1;
3323                 /* invalidation. Invalidate only when needed, i.e.
3324                  * when there are already sectors in the buffer cache
3325                  * whose number will change. This is useful, because
3326                  * mtools often changes the geometry of the disk after
3327                  * looking at the boot block */
3328                 if (DRS->maxblock > user_params[drive].sect ||
3329                     DRS->maxtrack ||
3330                     ((user_params[drive].sect ^ oldStretch) &
3331                      (FD_SWAPSIDES | FD_SECTBASEMASK)))
3332                         invalidate_drive(bdev);
3333                 else
3334                         process_fd_request();
3335         }
3336         return 0;
3337 }
3338
3339 /* handle obsolete ioctl's */
3340 static int ioctl_table[] = {
3341         FDCLRPRM,
3342         FDSETPRM,
3343         FDDEFPRM,
3344         FDGETPRM,
3345         FDMSGON,
3346         FDMSGOFF,
3347         FDFMTBEG,
3348         FDFMTTRK,
3349         FDFMTEND,
3350         FDSETEMSGTRESH,
3351         FDFLUSH,
3352         FDSETMAXERRS,
3353         FDGETMAXERRS,
3354         FDGETDRVTYP,
3355         FDSETDRVPRM,
3356         FDGETDRVPRM,
3357         FDGETDRVSTAT,
3358         FDPOLLDRVSTAT,
3359         FDRESET,
3360         FDGETFDCSTAT,
3361         FDWERRORCLR,
3362         FDWERRORGET,
3363         FDRAWCMD,
3364         FDEJECT,
3365         FDTWADDLE
3366 };
3367
3368 static inline int normalize_ioctl(int *cmd, int *size)
3369 {
3370         int i;
3371
3372         for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3373                 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3374                         *size = _IOC_SIZE(*cmd);
3375                         *cmd = ioctl_table[i];
3376                         if (*size > _IOC_SIZE(*cmd)) {
3377                                 pr_info("ioctl not yet supported\n");
3378                                 return -EFAULT;
3379                         }
3380                         return 0;
3381                 }
3382         }
3383         return -EINVAL;
3384 }
3385
3386 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3387 {
3388         if (type)
3389                 *g = &floppy_type[type];
3390         else {
3391                 if (lock_fdc(drive, false))
3392                         return -EINTR;
3393                 if (poll_drive(false, 0) == -EINTR)
3394                         return -EINTR;
3395                 process_fd_request();
3396                 *g = current_type[drive];
3397         }
3398         if (!*g)
3399                 return -ENODEV;
3400         return 0;
3401 }
3402
3403 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3404 {
3405         int drive = (long)bdev->bd_disk->private_data;
3406         int type = ITYPE(drive_state[drive].fd_device);
3407         struct floppy_struct *g;
3408         int ret;
3409
3410         ret = get_floppy_geometry(drive, type, &g);
3411         if (ret)
3412                 return ret;
3413
3414         geo->heads = g->head;
3415         geo->sectors = g->sect;
3416         geo->cylinders = g->track;
3417         return 0;
3418 }
3419
3420 static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3421                     unsigned long param)
3422 {
3423         int drive = (long)bdev->bd_disk->private_data;
3424         int type = ITYPE(UDRS->fd_device);
3425         int i;
3426         int ret;
3427         int size;
3428         union inparam {
3429                 struct floppy_struct g; /* geometry */
3430                 struct format_descr f;
3431                 struct floppy_max_errors max_errors;
3432                 struct floppy_drive_params dp;
3433         } inparam;              /* parameters coming from user space */
3434         const void *outparam;   /* parameters passed back to user space */
3435
3436         /* convert compatibility eject ioctls into floppy eject ioctl.
3437          * We do this in order to provide a means to eject floppy disks before
3438          * installing the new fdutils package */
3439         if (cmd == CDROMEJECT ||        /* CD-ROM eject */
3440             cmd == 0x6470) {            /* SunOS floppy eject */
3441                 DPRINT("obsolete eject ioctl\n");
3442                 DPRINT("please use floppycontrol --eject\n");
3443                 cmd = FDEJECT;
3444         }
3445
3446         if (!((cmd & 0xff00) == 0x0200))
3447                 return -EINVAL;
3448
3449         /* convert the old style command into a new style command */
3450         ret = normalize_ioctl(&cmd, &size);
3451         if (ret)
3452                 return ret;
3453
3454         /* permission checks */
3455         if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3456             ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3457                 return -EPERM;
3458
3459         if (WARN_ON(size < 0 || size > sizeof(inparam)))
3460                 return -EINVAL;
3461
3462         /* copyin */
3463         memset(&inparam, 0, sizeof(inparam));
3464         if (_IOC_DIR(cmd) & _IOC_WRITE) {
3465                 ret = fd_copyin((void __user *)param, &inparam, size);
3466                 if (ret)
3467                         return ret;
3468         }
3469
3470         switch (cmd) {
3471         case FDEJECT:
3472                 if (UDRS->fd_ref != 1)
3473                         /* somebody else has this drive open */
3474                         return -EBUSY;
3475                 if (lock_fdc(drive, true))
3476                         return -EINTR;
3477
3478                 /* do the actual eject. Fails on
3479                  * non-Sparc architectures */
3480                 ret = fd_eject(UNIT(drive));
3481
3482                 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3483                 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3484                 process_fd_request();
3485                 return ret;
3486         case FDCLRPRM:
3487                 if (lock_fdc(drive, true))
3488                         return -EINTR;
3489                 current_type[drive] = NULL;
3490                 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3491                 UDRS->keep_data = 0;
3492                 return invalidate_drive(bdev);
3493         case FDSETPRM:
3494         case FDDEFPRM:
3495                 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3496         case FDGETPRM:
3497                 ret = get_floppy_geometry(drive, type,
3498                                           (struct floppy_struct **)&outparam);
3499                 if (ret)
3500                         return ret;
3501                 break;
3502         case FDMSGON:
3503                 UDP->flags |= FTD_MSG;
3504                 return 0;
3505         case FDMSGOFF:
3506                 UDP->flags &= ~FTD_MSG;
3507                 return 0;
3508         case FDFMTBEG:
3509                 if (lock_fdc(drive, true))
3510                         return -EINTR;
3511                 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3512                         return -EINTR;
3513                 ret = UDRS->flags;
3514                 process_fd_request();
3515                 if (ret & FD_VERIFY)
3516                         return -ENODEV;
3517                 if (!(ret & FD_DISK_WRITABLE))
3518                         return -EROFS;
3519                 return 0;
3520         case FDFMTTRK:
3521                 if (UDRS->fd_ref != 1)
3522                         return -EBUSY;
3523                 return do_format(drive, &inparam.f);
3524         case FDFMTEND:
3525         case FDFLUSH:
3526                 if (lock_fdc(drive, true))
3527                         return -EINTR;
3528                 return invalidate_drive(bdev);
3529         case FDSETEMSGTRESH:
3530                 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3531                 return 0;
3532         case FDGETMAXERRS:
3533                 outparam = &UDP->max_errors;
3534                 break;
3535         case FDSETMAXERRS:
3536                 UDP->max_errors = inparam.max_errors;
3537                 break;
3538         case FDGETDRVTYP:
3539                 outparam = drive_name(type, drive);
3540                 SUPBOUND(size, strlen((const char *)outparam) + 1);
3541                 break;
3542         case FDSETDRVPRM:
3543                 *UDP = inparam.dp;
3544                 break;
3545         case FDGETDRVPRM:
3546                 outparam = UDP;
3547                 break;
3548         case FDPOLLDRVSTAT:
3549                 if (lock_fdc(drive, true))
3550                         return -EINTR;
3551                 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3552                         return -EINTR;
3553                 process_fd_request();
3554                 /* fall through */
3555         case FDGETDRVSTAT:
3556                 outparam = UDRS;
3557                 break;
3558         case FDRESET:
3559                 return user_reset_fdc(drive, (int)param, true);
3560         case FDGETFDCSTAT:
3561                 outparam = UFDCS;
3562                 break;
3563         case FDWERRORCLR:
3564                 memset(UDRWE, 0, sizeof(*UDRWE));
3565                 return 0;
3566         case FDWERRORGET:
3567                 outparam = UDRWE;
3568                 break;
3569         case FDRAWCMD:
3570                 if (type)
3571                         return -EINVAL;
3572                 if (lock_fdc(drive, true))
3573                         return -EINTR;
3574                 set_floppy(drive);
3575                 i = raw_cmd_ioctl(cmd, (void __user *)param);
3576                 if (i == -EINTR)
3577                         return -EINTR;
3578                 process_fd_request();
3579                 return i;
3580         case FDTWADDLE:
3581                 if (lock_fdc(drive, true))
3582                         return -EINTR;
3583                 twaddle();
3584                 process_fd_request();
3585                 return 0;
3586         default:
3587                 return -EINVAL;
3588         }
3589
3590         if (_IOC_DIR(cmd) & _IOC_READ)
3591                 return fd_copyout((void __user *)param, outparam, size);
3592
3593         return 0;
3594 }
3595
3596 static void __init config_types(void)
3597 {
3598         bool has_drive = false;
3599         int drive;
3600
3601         /* read drive info out of physical CMOS */
3602         drive = 0;
3603         if (!UDP->cmos)
3604                 UDP->cmos = FLOPPY0_TYPE;
3605         drive = 1;
3606         if (!UDP->cmos && FLOPPY1_TYPE)
3607                 UDP->cmos = FLOPPY1_TYPE;
3608
3609         /* FIXME: additional physical CMOS drive detection should go here */
3610
3611         for (drive = 0; drive < N_DRIVE; drive++) {
3612                 unsigned int type = UDP->cmos;
3613                 struct floppy_drive_params *params;
3614                 const char *name = NULL;
3615                 static char temparea[32];
3616
3617                 if (type < ARRAY_SIZE(default_drive_params)) {
3618                         params = &default_drive_params[type].params;
3619                         if (type) {
3620                                 name = default_drive_params[type].name;
3621                                 allowed_drive_mask |= 1 << drive;
3622                         } else
3623                                 allowed_drive_mask &= ~(1 << drive);
3624                 } else {
3625                         params = &default_drive_params[0].params;
3626                         sprintf(temparea, "unknown type %d (usb?)", type);
3627                         name = temparea;
3628                 }
3629                 if (name) {
3630                         const char *prepend;
3631                         if (!has_drive) {
3632                                 prepend = "";
3633                                 has_drive = true;
3634                                 pr_info("Floppy drive(s):");
3635                         } else {
3636                                 prepend = ",";
3637                         }
3638
3639                         pr_cont("%s fd%d is %s", prepend, drive, name);
3640                 }
3641                 *UDP = *params;
3642         }
3643
3644         if (has_drive)
3645                 pr_cont("\n");
3646 }
3647
3648 static int floppy_release(struct gendisk *disk, fmode_t mode)
3649 {
3650         int drive = (long)disk->private_data;
3651
3652         mutex_lock(&open_lock);
3653         if (UDRS->fd_ref < 0)
3654                 UDRS->fd_ref = 0;
3655         else if (!UDRS->fd_ref--) {
3656                 DPRINT("floppy_release with fd_ref == 0");
3657                 UDRS->fd_ref = 0;
3658         }
3659         if (!UDRS->fd_ref)
3660                 opened_bdev[drive] = NULL;
3661         mutex_unlock(&open_lock);
3662
3663         return 0;
3664 }
3665
3666 /*
3667  * floppy_open check for aliasing (/dev/fd0 can be the same as
3668  * /dev/PS0 etc), and disallows simultaneous access to the same
3669  * drive with different device numbers.
3670  */
3671 static int floppy_open(struct block_device *bdev, fmode_t mode)
3672 {
3673         int drive = (long)bdev->bd_disk->private_data;
3674         int old_dev, new_dev;
3675         int try;
3676         int res = -EBUSY;
3677         char *tmp;
3678
3679         mutex_lock(&open_lock);
3680         old_dev = UDRS->fd_device;
3681         if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3682                 goto out2;
3683
3684         if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3685                 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3686                 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3687         }
3688
3689         if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
3690                 goto out2;
3691
3692         if (mode & FMODE_EXCL)
3693                 UDRS->fd_ref = -1;
3694         else
3695                 UDRS->fd_ref++;
3696
3697         opened_bdev[drive] = bdev;
3698
3699         res = -ENXIO;
3700
3701         if (!floppy_track_buffer) {
3702                 /* if opening an ED drive, reserve a big buffer,
3703                  * else reserve a small one */
3704                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3705                         try = 64;       /* Only 48 actually useful */
3706                 else
3707                         try = 32;       /* Only 24 actually useful */
3708
3709                 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3710                 if (!tmp && !floppy_track_buffer) {
3711                         try >>= 1;      /* buffer only one side */
3712                         INFBOUND(try, 16);
3713                         tmp = (char *)fd_dma_mem_alloc(1024 * try);
3714                 }
3715                 if (!tmp && !floppy_track_buffer)
3716                         fallback_on_nodma_alloc(&tmp, 2048 * try);
3717                 if (!tmp && !floppy_track_buffer) {
3718                         DPRINT("Unable to allocate DMA memory\n");
3719                         goto out;
3720                 }
3721                 if (floppy_track_buffer) {
3722                         if (tmp)
3723                                 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3724                 } else {
3725                         buffer_min = buffer_max = -1;
3726                         floppy_track_buffer = tmp;
3727                         max_buffer_sectors = try;
3728                 }
3729         }
3730
3731         new_dev = MINOR(bdev->bd_dev);
3732         UDRS->fd_device = new_dev;
3733         set_capacity(disks[drive], floppy_sizes[new_dev]);
3734         if (old_dev != -1 && old_dev != new_dev) {
3735                 if (buffer_drive == drive)
3736                         buffer_track = -1;
3737         }
3738
3739         if (UFDCS->rawcmd == 1)
3740                 UFDCS->rawcmd = 2;
3741
3742         if (!(mode & FMODE_NDELAY)) {
3743                 if (mode & (FMODE_READ|FMODE_WRITE)) {
3744                         UDRS->last_checked = 0;
3745                         check_disk_change(bdev);
3746                         if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
3747                                 goto out;
3748                 }
3749                 res = -EROFS;
3750                 if ((mode & FMODE_WRITE) &&
3751                     !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
3752                         goto out;
3753         }
3754         mutex_unlock(&open_lock);
3755         return 0;
3756 out:
3757         if (UDRS->fd_ref < 0)
3758                 UDRS->fd_ref = 0;
3759         else
3760                 UDRS->fd_ref--;
3761         if (!UDRS->fd_ref)
3762                 opened_bdev[drive] = NULL;
3763 out2:
3764         mutex_unlock(&open_lock);
3765         return res;
3766 }
3767
3768 /*
3769  * Check if the disk has been changed or if a change has been faked.
3770  */
3771 static int check_floppy_change(struct gendisk *disk)
3772 {
3773         int drive = (long)disk->private_data;
3774
3775         if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3776             test_bit(FD_VERIFY_BIT, &UDRS->flags))
3777                 return 1;
3778
3779         if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3780                 lock_fdc(drive, false);
3781                 poll_drive(false, 0);
3782                 process_fd_request();
3783         }
3784
3785         if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3786             test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3787             test_bit(drive, &fake_change) ||
3788             (!ITYPE(UDRS->fd_device) && !current_type[drive]))
3789                 return 1;
3790         return 0;
3791 }
3792
3793 /*
3794  * This implements "read block 0" for floppy_revalidate().
3795  * Needed for format autodetection, checking whether there is
3796  * a disk in the drive, and whether that disk is writable.
3797  */
3798
3799 static void floppy_rb0_complete(struct bio *bio, int err)
3800 {
3801         complete((struct completion *)bio->bi_private);
3802 }
3803
3804 static int __floppy_read_block_0(struct block_device *bdev)
3805 {
3806         struct bio bio;
3807         struct bio_vec bio_vec;
3808         struct completion complete;
3809         struct page *page;
3810         size_t size;
3811
3812         page = alloc_page(GFP_NOIO);
3813         if (!page) {
3814                 process_fd_request();
3815                 return -ENOMEM;
3816         }
3817
3818         size = bdev->bd_block_size;
3819         if (!size)
3820                 size = 1024;
3821
3822         bio_init(&bio);
3823         bio.bi_io_vec = &bio_vec;
3824         bio_vec.bv_page = page;
3825         bio_vec.bv_len = size;
3826         bio_vec.bv_offset = 0;
3827         bio.bi_vcnt = 1;
3828         bio.bi_idx = 0;
3829         bio.bi_size = size;
3830         bio.bi_bdev = bdev;
3831         bio.bi_sector = 0;
3832         init_completion(&complete);
3833         bio.bi_private = &complete;
3834         bio.bi_end_io = floppy_rb0_complete;
3835
3836         submit_bio(READ, &bio);
3837         generic_unplug_device(bdev_get_queue(bdev));
3838         process_fd_request();
3839         wait_for_completion(&complete);
3840
3841         __free_page(page);
3842
3843         return 0;
3844 }
3845
3846 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3847  * the bootblock (block 0). "Autodetection" is also needed to check whether
3848  * there is a disk in the drive at all... Thus we also do it for fixed
3849  * geometry formats */
3850 static int floppy_revalidate(struct gendisk *disk)
3851 {
3852         int drive = (long)disk->private_data;
3853 #define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
3854         int cf;
3855         int res = 0;
3856
3857         if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3858             test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3859             test_bit(drive, &fake_change) || NO_GEOM) {
3860                 if (usage_count == 0) {
3861                         pr_info("VFS: revalidate called on non-open device.\n");
3862                         return -EFAULT;
3863                 }
3864                 lock_fdc(drive, false);
3865                 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3866                       test_bit(FD_VERIFY_BIT, &UDRS->flags));
3867                 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
3868                         process_fd_request();   /*already done by another thread */
3869                         return 0;
3870                 }
3871                 UDRS->maxblock = 0;
3872                 UDRS->maxtrack = 0;
3873                 if (buffer_drive == drive)
3874                         buffer_track = -1;
3875                 clear_bit(drive, &fake_change);
3876                 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3877                 if (cf)
3878                         UDRS->generation++;
3879                 if (NO_GEOM) {
3880                         /* auto-sensing */
3881                         res = __floppy_read_block_0(opened_bdev[drive]);
3882                 } else {
3883                         if (cf)
3884                                 poll_drive(false, FD_RAW_NEED_DISK);
3885                         process_fd_request();
3886                 }
3887         }
3888         set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3889         return res;
3890 }
3891
3892 static const struct block_device_operations floppy_fops = {
3893         .owner                  = THIS_MODULE,
3894         .open                   = floppy_open,
3895         .release                = floppy_release,
3896         .locked_ioctl           = fd_ioctl,
3897         .getgeo                 = fd_getgeo,
3898         .media_changed          = check_floppy_change,
3899         .revalidate_disk        = floppy_revalidate,
3900 };
3901
3902 /*
3903  * Floppy Driver initialization
3904  * =============================
3905  */
3906
3907 /* Determine the floppy disk controller type */
3908 /* This routine was written by David C. Niemi */
3909 static char __init get_fdc_version(void)
3910 {
3911         int r;
3912
3913         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3914         if (FDCS->reset)
3915                 return FDC_NONE;
3916         r = result();
3917         if (r <= 0x00)
3918                 return FDC_NONE;        /* No FDC present ??? */
3919         if ((r == 1) && (reply_buffer[0] == 0x80)) {
3920                 pr_info("FDC %d is an 8272A\n", fdc);
3921                 return FDC_8272A;       /* 8272a/765 don't know DUMPREGS */
3922         }
3923         if (r != 10) {
3924                 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3925                         fdc, r);
3926                 return FDC_UNKNOWN;
3927         }
3928
3929         if (!fdc_configure()) {
3930                 pr_info("FDC %d is an 82072\n", fdc);
3931                 return FDC_82072;       /* 82072 doesn't know CONFIGURE */
3932         }
3933
3934         output_byte(FD_PERPENDICULAR);
3935         if (need_more_output() == MORE_OUTPUT) {
3936                 output_byte(0);
3937         } else {
3938                 pr_info("FDC %d is an 82072A\n", fdc);
3939                 return FDC_82072A;      /* 82072A as found on Sparcs. */
3940         }
3941
3942         output_byte(FD_UNLOCK);
3943         r = result();
3944         if ((r == 1) && (reply_buffer[0] == 0x80)) {
3945                 pr_info("FDC %d is a pre-1991 82077\n", fdc);
3946                 return FDC_82077_ORIG;  /* Pre-1991 82077, doesn't know
3947                                          * LOCK/UNLOCK */
3948         }
3949         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3950                 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3951                         fdc, r);
3952                 return FDC_UNKNOWN;
3953         }
3954         output_byte(FD_PARTID);
3955         r = result();
3956         if (r != 1) {
3957                 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3958                         fdc, r);
3959                 return FDC_UNKNOWN;
3960         }
3961         if (reply_buffer[0] == 0x80) {
3962                 pr_info("FDC %d is a post-1991 82077\n", fdc);
3963                 return FDC_82077;       /* Revised 82077AA passes all the tests */
3964         }
3965         switch (reply_buffer[0] >> 5) {
3966         case 0x0:
3967                 /* Either a 82078-1 or a 82078SL running at 5Volt */
3968                 pr_info("FDC %d is an 82078.\n", fdc);
3969                 return FDC_82078;
3970         case 0x1:
3971                 pr_info("FDC %d is a 44pin 82078\n", fdc);
3972                 return FDC_82078;
3973         case 0x2:
3974                 pr_info("FDC %d is a S82078B\n", fdc);
3975                 return FDC_S82078B;
3976         case 0x3:
3977                 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
3978                 return FDC_87306;
3979         default:
3980                 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
3981                         fdc, reply_buffer[0] >> 5);
3982                 return FDC_82078_UNKN;
3983         }
3984 }                               /* get_fdc_version */
3985
3986 /* lilo configuration */
3987
3988 static void __init floppy_set_flags(int *ints, int param, int param2)
3989 {
3990         int i;
3991
3992         for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3993                 if (param)
3994                         default_drive_params[i].params.flags |= param2;
3995                 else
3996                         default_drive_params[i].params.flags &= ~param2;
3997         }
3998         DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
3999 }
4000
4001 static void __init daring(int *ints, int param, int param2)
4002 {
4003         int i;
4004
4005         for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4006                 if (param) {
4007                         default_drive_params[i].params.select_delay = 0;
4008                         default_drive_params[i].params.flags |=
4009                             FD_SILENT_DCL_CLEAR;
4010                 } else {
4011                         default_drive_params[i].params.select_delay =
4012                             2 * HZ / 100;
4013                         default_drive_params[i].params.flags &=
4014                             ~FD_SILENT_DCL_CLEAR;
4015                 }
4016         }
4017         DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4018 }
4019
4020 static void __init set_cmos(int *ints, int dummy, int dummy2)
4021 {
4022         int current_drive = 0;
4023
4024         if (ints[0] != 2) {
4025                 DPRINT("wrong number of parameters for CMOS\n");
4026                 return;
4027         }
4028         current_drive = ints[1];
4029         if (current_drive < 0 || current_drive >= 8) {
4030                 DPRINT("bad drive for set_cmos\n");
4031                 return;
4032         }
4033 #if N_FDC > 1
4034         if (current_drive >= 4 && !FDC2)
4035                 FDC2 = 0x370;
4036 #endif
4037         DP->cmos = ints[2];
4038         DPRINT("setting CMOS code to %d\n", ints[2]);
4039 }
4040
4041 static struct param_table {
4042         const char *name;
4043         void (*fn) (int *ints, int param, int param2);
4044         int *var;
4045         int def_param;
4046         int param2;
4047 } config_params[] __initdata = {
4048         {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4049         {"all_drives", NULL, &allowed_drive_mask, 0xff, 0},     /* obsolete */
4050         {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4051         {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4052         {"dma", NULL, &FLOPPY_DMA, 2, 0},
4053         {"daring", daring, NULL, 1, 0},
4054 #if N_FDC > 1
4055         {"two_fdc", NULL, &FDC2, 0x370, 0},
4056         {"one_fdc", NULL, &FDC2, 0, 0},
4057 #endif
4058         {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4059         {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4060         {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4061         {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4062         {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4063         {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4064         {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4065         {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4066         {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4067         {"nofifo", NULL, &no_fifo, 0x20, 0},
4068         {"usefifo", NULL, &no_fifo, 0, 0},
4069         {"cmos", set_cmos, NULL, 0, 0},
4070         {"slow", NULL, &slow_floppy, 1, 0},
4071         {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4072         {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4073         {"L40SX", NULL, &print_unex, 0, 0}
4074
4075         EXTRA_FLOPPY_PARAMS
4076 };
4077
4078 static int __init floppy_setup(char *str)
4079 {
4080         int i;
4081         int param;
4082         int ints[11];
4083
4084         str = get_options(str, ARRAY_SIZE(ints), ints);
4085         if (str) {
4086                 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4087                         if (strcmp(str, config_params[i].name) == 0) {
4088                                 if (ints[0])
4089                                         param = ints[1];
4090                                 else
4091                                         param = config_params[i].def_param;
4092                                 if (config_params[i].fn)
4093                                         config_params[i].fn(ints, param,
4094                                                             config_params[i].
4095                                                             param2);
4096                                 if (config_params[i].var) {
4097                                         DPRINT("%s=%d\n", str, param);
4098                                         *config_params[i].var = param;
4099                                 }
4100                                 return 1;
4101                         }
4102                 }
4103         }
4104         if (str) {
4105                 DPRINT("unknown floppy option [%s]\n", str);
4106
4107                 DPRINT("allowed options are:");
4108                 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4109                         pr_cont(" %s", config_params[i].name);
4110                 pr_cont("\n");
4111         } else
4112                 DPRINT("botched floppy option\n");
4113         DPRINT("Read Documentation/blockdev/floppy.txt\n");
4114         return 0;
4115 }
4116
4117 static int have_no_fdc = -ENODEV;
4118
4119 static ssize_t floppy_cmos_show(struct device *dev,
4120                                 struct device_attribute *attr, char *buf)
4121 {
4122         struct platform_device *p = to_platform_device(dev);
4123         int drive;
4124
4125         drive = p->id;
4126         return sprintf(buf, "%X\n", UDP->cmos);
4127 }
4128
4129 DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4130
4131 static void floppy_device_release(struct device *dev)
4132 {
4133 }
4134
4135 static int floppy_resume(struct device *dev)
4136 {
4137         int fdc;
4138
4139         for (fdc = 0; fdc < N_FDC; fdc++)
4140                 if (FDCS->address != -1)
4141                         user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4142
4143         return 0;
4144 }
4145
4146 static const struct dev_pm_ops floppy_pm_ops = {
4147         .resume = floppy_resume,
4148         .restore = floppy_resume,
4149 };
4150
4151 static struct platform_driver floppy_driver = {
4152         .driver = {
4153                    .name = "floppy",
4154                    .pm = &floppy_pm_ops,
4155         },
4156 };
4157
4158 static struct platform_device floppy_device[N_DRIVE];
4159
4160 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4161 {
4162         int drive = (*part & 3) | ((*part & 0x80) >> 5);
4163         if (drive >= N_DRIVE ||
4164             !(allowed_drive_mask & (1 << drive)) ||
4165             fdc_state[FDC(drive)].version == FDC_NONE)
4166                 return NULL;
4167         if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4168                 return NULL;
4169         *part = 0;
4170         return get_disk(disks[drive]);
4171 }
4172
4173 static int __init floppy_init(void)
4174 {
4175         int i, unit, drive;
4176         int err, dr;
4177
4178 #if defined(CONFIG_PPC)
4179         if (check_legacy_ioport(FDC1))
4180                 return -ENODEV;
4181 #endif
4182
4183         raw_cmd = NULL;
4184
4185         for (dr = 0; dr < N_DRIVE; dr++) {
4186                 disks[dr] = alloc_disk(1);
4187                 if (!disks[dr]) {
4188                         err = -ENOMEM;
4189                         goto out_put_disk;
4190                 }
4191
4192                 disks[dr]->major = FLOPPY_MAJOR;
4193                 disks[dr]->first_minor = TOMINOR(dr);
4194                 disks[dr]->fops = &floppy_fops;
4195                 sprintf(disks[dr]->disk_name, "fd%d", dr);
4196
4197                 init_timer(&motor_off_timer[dr]);
4198                 motor_off_timer[dr].data = dr;
4199                 motor_off_timer[dr].function = motor_off_callback;
4200         }
4201
4202         err = register_blkdev(FLOPPY_MAJOR, "fd");
4203         if (err)
4204                 goto out_put_disk;
4205
4206         err = platform_driver_register(&floppy_driver);
4207         if (err)
4208                 goto out_unreg_blkdev;
4209
4210         floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
4211         if (!floppy_queue) {
4212                 err = -ENOMEM;
4213                 goto out_unreg_driver;
4214         }
4215         blk_queue_max_hw_sectors(floppy_queue, 64);
4216
4217         blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4218                             floppy_find, NULL, NULL);
4219
4220         for (i = 0; i < 256; i++)
4221                 if (ITYPE(i))
4222                         floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4223                 else
4224                         floppy_sizes[i] = MAX_DISK_SIZE << 1;
4225
4226         reschedule_timeout(MAXTIMEOUT, "floppy init");
4227         config_types();
4228
4229         for (i = 0; i < N_FDC; i++) {
4230                 fdc = i;
4231                 memset(FDCS, 0, sizeof(*FDCS));
4232                 FDCS->dtr = -1;
4233                 FDCS->dor = 0x4;
4234 #if defined(__sparc__) || defined(__mc68000__)
4235         /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4236 #ifdef __mc68000__
4237                 if (MACH_IS_SUN3X)
4238 #endif
4239                         FDCS->version = FDC_82072A;
4240 #endif
4241         }
4242
4243         use_virtual_dma = can_use_virtual_dma & 1;
4244         fdc_state[0].address = FDC1;
4245         if (fdc_state[0].address == -1) {
4246                 del_timer(&fd_timeout);
4247                 err = -ENODEV;
4248                 goto out_unreg_region;
4249         }
4250 #if N_FDC > 1
4251         fdc_state[1].address = FDC2;
4252 #endif
4253
4254         fdc = 0;                /* reset fdc in case of unexpected interrupt */
4255         err = floppy_grab_irq_and_dma();
4256         if (err) {
4257                 del_timer(&fd_timeout);
4258                 err = -EBUSY;
4259                 goto out_unreg_region;
4260         }
4261
4262         /* initialise drive state */
4263         for (drive = 0; drive < N_DRIVE; drive++) {
4264                 memset(UDRS, 0, sizeof(*UDRS));
4265                 memset(UDRWE, 0, sizeof(*UDRWE));
4266                 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4267                 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4268                 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4269                 UDRS->fd_device = -1;
4270                 floppy_track_buffer = NULL;
4271                 max_buffer_sectors = 0;
4272         }
4273         /*
4274          * Small 10 msec delay to let through any interrupt that
4275          * initialization might have triggered, to not
4276          * confuse detection:
4277          */
4278         msleep(10);
4279
4280         for (i = 0; i < N_FDC; i++) {
4281                 fdc = i;
4282                 FDCS->driver_version = FD_DRIVER_VERSION;
4283                 for (unit = 0; unit < 4; unit++)
4284                         FDCS->track[unit] = 0;
4285                 if (FDCS->address == -1)
4286                         continue;
4287                 FDCS->rawcmd = 2;
4288                 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4289                         /* free ioports reserved by floppy_grab_irq_and_dma() */
4290                         floppy_release_regions(fdc);
4291                         FDCS->address = -1;
4292                         FDCS->version = FDC_NONE;
4293                         continue;
4294                 }
4295                 /* Try to determine the floppy controller type */
4296                 FDCS->version = get_fdc_version();
4297                 if (FDCS->version == FDC_NONE) {
4298                         /* free ioports reserved by floppy_grab_irq_and_dma() */
4299                         floppy_release_regions(fdc);
4300                         FDCS->address = -1;
4301                         continue;
4302                 }
4303                 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4304                         can_use_virtual_dma = 0;
4305
4306                 have_no_fdc = 0;
4307                 /* Not all FDCs seem to be able to handle the version command
4308                  * properly, so force a reset for the standard FDC clones,
4309                  * to avoid interrupt garbage.
4310                  */
4311                 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4312         }
4313         fdc = 0;
4314         del_timer(&fd_timeout);
4315         current_drive = 0;
4316         initialized = true;
4317         if (have_no_fdc) {
4318                 DPRINT("no floppy controllers found\n");
4319                 err = have_no_fdc;
4320                 goto out_flush_work;
4321         }
4322
4323         for (drive = 0; drive < N_DRIVE; drive++) {
4324                 if (!(allowed_drive_mask & (1 << drive)))
4325                         continue;
4326                 if (fdc_state[FDC(drive)].version == FDC_NONE)
4327                         continue;
4328
4329                 floppy_device[drive].name = floppy_device_name;
4330                 floppy_device[drive].id = drive;
4331                 floppy_device[drive].dev.release = floppy_device_release;
4332
4333                 err = platform_device_register(&floppy_device[drive]);
4334                 if (err)
4335                         goto out_flush_work;
4336
4337                 err = device_create_file(&floppy_device[drive].dev,
4338                                          &dev_attr_cmos);
4339                 if (err)
4340                         goto out_unreg_platform_dev;
4341
4342                 /* to be cleaned up... */
4343                 disks[drive]->private_data = (void *)(long)drive;
4344                 disks[drive]->queue = floppy_queue;
4345                 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4346                 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4347                 add_disk(disks[drive]);
4348         }
4349
4350         return 0;
4351
4352 out_unreg_platform_dev:
4353         platform_device_unregister(&floppy_device[drive]);
4354 out_flush_work:
4355         flush_scheduled_work();
4356         if (usage_count)
4357                 floppy_release_irq_and_dma();
4358 out_unreg_region:
4359         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4360         blk_cleanup_queue(floppy_queue);
4361 out_unreg_driver:
4362         platform_driver_unregister(&floppy_driver);
4363 out_unreg_blkdev:
4364         unregister_blkdev(FLOPPY_MAJOR, "fd");
4365 out_put_disk:
4366         while (dr--) {
4367                 del_timer(&motor_off_timer[dr]);
4368                 put_disk(disks[dr]);
4369         }
4370         return err;
4371 }
4372
4373 static DEFINE_SPINLOCK(floppy_usage_lock);
4374
4375 static const struct io_region {
4376         int offset;
4377         int size;
4378 } io_regions[] = {
4379         { 2, 1 },
4380         /* address + 3 is sometimes reserved by pnp bios for motherboard */
4381         { 4, 2 },
4382         /* address + 6 is reserved, and may be taken by IDE.
4383          * Unfortunately, Adaptec doesn't know this :-(, */
4384         { 7, 1 },
4385 };
4386
4387 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4388 {
4389         while (p != io_regions) {
4390                 p--;
4391                 release_region(FDCS->address + p->offset, p->size);
4392         }
4393 }
4394
4395 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4396
4397 static int floppy_request_regions(int fdc)
4398 {
4399         const struct io_region *p;
4400
4401         for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4402                 if (!request_region(FDCS->address + p->offset,
4403                                     p->size, "floppy")) {
4404                         DPRINT("Floppy io-port 0x%04lx in use\n",
4405                                FDCS->address + p->offset);
4406                         floppy_release_allocated_regions(fdc, p);
4407                         return -EBUSY;
4408                 }
4409         }
4410         return 0;
4411 }
4412
4413 static void floppy_release_regions(int fdc)
4414 {
4415         floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4416 }
4417
4418 static int floppy_grab_irq_and_dma(void)
4419 {
4420         unsigned long flags;
4421
4422         spin_lock_irqsave(&floppy_usage_lock, flags);
4423         if (usage_count++) {
4424                 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4425                 return 0;
4426         }
4427         spin_unlock_irqrestore(&floppy_usage_lock, flags);
4428
4429         /*
4430          * We might have scheduled a free_irq(), wait it to
4431          * drain first:
4432          */
4433         flush_scheduled_work();
4434
4435         if (fd_request_irq()) {
4436                 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4437                        FLOPPY_IRQ);
4438                 spin_lock_irqsave(&floppy_usage_lock, flags);
4439                 usage_count--;
4440                 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4441                 return -1;
4442         }
4443         if (fd_request_dma()) {
4444                 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4445                        FLOPPY_DMA);
4446                 if (can_use_virtual_dma & 2)
4447                         use_virtual_dma = can_use_virtual_dma = 1;
4448                 if (!(can_use_virtual_dma & 1)) {
4449                         fd_free_irq();
4450                         spin_lock_irqsave(&floppy_usage_lock, flags);
4451                         usage_count--;
4452                         spin_unlock_irqrestore(&floppy_usage_lock, flags);
4453                         return -1;
4454                 }
4455         }
4456
4457         for (fdc = 0; fdc < N_FDC; fdc++) {
4458                 if (FDCS->address != -1) {
4459                         if (floppy_request_regions(fdc))
4460                                 goto cleanup;
4461                 }
4462         }
4463         for (fdc = 0; fdc < N_FDC; fdc++) {
4464                 if (FDCS->address != -1) {
4465                         reset_fdc_info(1);
4466                         fd_outb(FDCS->dor, FD_DOR);
4467                 }
4468         }
4469         fdc = 0;
4470         set_dor(0, ~0, 8);      /* avoid immediate interrupt */
4471
4472         for (fdc = 0; fdc < N_FDC; fdc++)
4473                 if (FDCS->address != -1)
4474                         fd_outb(FDCS->dor, FD_DOR);
4475         /*
4476          * The driver will try and free resources and relies on us
4477          * to know if they were allocated or not.
4478          */
4479         fdc = 0;
4480         irqdma_allocated = 1;
4481         return 0;
4482 cleanup:
4483         fd_free_irq();
4484         fd_free_dma();
4485         while (--fdc >= 0)
4486                 floppy_release_regions(fdc);
4487         spin_lock_irqsave(&floppy_usage_lock, flags);
4488         usage_count--;
4489         spin_unlock_irqrestore(&floppy_usage_lock, flags);
4490         return -1;
4491 }
4492
4493 static void floppy_release_irq_and_dma(void)
4494 {
4495         int old_fdc;
4496 #ifndef __sparc__
4497         int drive;
4498 #endif
4499         long tmpsize;
4500         unsigned long tmpaddr;
4501         unsigned long flags;
4502
4503         spin_lock_irqsave(&floppy_usage_lock, flags);
4504         if (--usage_count) {
4505                 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4506                 return;
4507         }
4508         spin_unlock_irqrestore(&floppy_usage_lock, flags);
4509         if (irqdma_allocated) {
4510                 fd_disable_dma();
4511                 fd_free_dma();
4512                 fd_free_irq();
4513                 irqdma_allocated = 0;
4514         }
4515         set_dor(0, ~0, 8);
4516 #if N_FDC > 1
4517         set_dor(1, ~8, 0);
4518 #endif
4519         floppy_enable_hlt();
4520
4521         if (floppy_track_buffer && max_buffer_sectors) {
4522                 tmpsize = max_buffer_sectors * 1024;
4523                 tmpaddr = (unsigned long)floppy_track_buffer;
4524                 floppy_track_buffer = NULL;
4525                 max_buffer_sectors = 0;
4526                 buffer_min = buffer_max = -1;
4527                 fd_dma_mem_free(tmpaddr, tmpsize);
4528         }
4529 #ifndef __sparc__
4530         for (drive = 0; drive < N_FDC * 4; drive++)
4531                 if (timer_pending(motor_off_timer + drive))
4532                         pr_info("motor off timer %d still active\n", drive);
4533 #endif
4534
4535         if (timer_pending(&fd_timeout))
4536                 pr_info("floppy timer still active:%s\n", timeout_message);
4537         if (timer_pending(&fd_timer))
4538                 pr_info("auxiliary floppy timer still active\n");
4539         if (work_pending(&floppy_work))
4540                 pr_info("work still pending\n");
4541         old_fdc = fdc;
4542         for (fdc = 0; fdc < N_FDC; fdc++)
4543                 if (FDCS->address != -1)
4544                         floppy_release_regions(fdc);
4545         fdc = old_fdc;
4546 }
4547
4548 #ifdef MODULE
4549
4550 static char *floppy;
4551
4552 static void __init parse_floppy_cfg_string(char *cfg)
4553 {
4554         char *ptr;
4555
4556         while (*cfg) {
4557                 ptr = cfg;
4558                 while (*cfg && *cfg != ' ' && *cfg != '\t')
4559                         cfg++;
4560                 if (*cfg) {
4561                         *cfg = '\0';
4562                         cfg++;
4563                 }
4564                 if (*ptr)
4565                         floppy_setup(ptr);
4566         }
4567 }
4568
4569 static int __init floppy_module_init(void)
4570 {
4571         if (floppy)
4572                 parse_floppy_cfg_string(floppy);
4573         return floppy_init();
4574 }
4575 module_init(floppy_module_init);
4576
4577 static void __exit floppy_module_exit(void)
4578 {
4579         int drive;
4580
4581         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4582         unregister_blkdev(FLOPPY_MAJOR, "fd");
4583         platform_driver_unregister(&floppy_driver);
4584
4585         for (drive = 0; drive < N_DRIVE; drive++) {
4586                 del_timer_sync(&motor_off_timer[drive]);
4587
4588                 if ((allowed_drive_mask & (1 << drive)) &&
4589                     fdc_state[FDC(drive)].version != FDC_NONE) {
4590                         del_gendisk(disks[drive]);
4591                         device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4592                         platform_device_unregister(&floppy_device[drive]);
4593                 }
4594                 put_disk(disks[drive]);
4595         }
4596
4597         del_timer_sync(&fd_timeout);
4598         del_timer_sync(&fd_timer);
4599         blk_cleanup_queue(floppy_queue);
4600
4601         if (usage_count)
4602                 floppy_release_irq_and_dma();
4603
4604         /* eject disk, if any */
4605         fd_eject(0);
4606 }
4607
4608 module_exit(floppy_module_exit);
4609
4610 module_param(floppy, charp, 0);
4611 module_param(FLOPPY_IRQ, int, 0);
4612 module_param(FLOPPY_DMA, int, 0);
4613 MODULE_AUTHOR("Alain L. Knaff");
4614 MODULE_SUPPORTED_DEVICE("fd");
4615 MODULE_LICENSE("GPL");
4616
4617 /* This doesn't actually get used other than for module information */
4618 static const struct pnp_device_id floppy_pnpids[] = {
4619         {"PNP0700", 0},
4620         {}
4621 };
4622
4623 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4624
4625 #else
4626
4627 __setup("floppy=", floppy_setup);
4628 module_init(floppy_init)
4629 #endif
4630
4631 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);