block: convert to pos and nr_sectors accessors
[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 #define FLOPPY_SANITY_CHECK
148 #undef  FLOPPY_SILENT_DCL_CLEAR
149
150 #define REALLY_SLOW_IO
151
152 #define DEBUGT 2
153 #define DCL_DEBUG       /* debug disk change line */
154
155 /* do print messages for unexpected interrupts */
156 static int print_unex = 1;
157 #include <linux/module.h>
158 #include <linux/sched.h>
159 #include <linux/fs.h>
160 #include <linux/kernel.h>
161 #include <linux/timer.h>
162 #include <linux/workqueue.h>
163 #define FDPATCHES
164 #include <linux/fdreg.h>
165 #include <linux/fd.h>
166 #include <linux/hdreg.h>
167 #include <linux/errno.h>
168 #include <linux/slab.h>
169 #include <linux/mm.h>
170 #include <linux/bio.h>
171 #include <linux/string.h>
172 #include <linux/jiffies.h>
173 #include <linux/fcntl.h>
174 #include <linux/delay.h>
175 #include <linux/mc146818rtc.h>  /* CMOS defines */
176 #include <linux/ioport.h>
177 #include <linux/interrupt.h>
178 #include <linux/init.h>
179 #include <linux/platform_device.h>
180 #include <linux/mod_devicetable.h>
181 #include <linux/buffer_head.h>  /* for invalidate_buffers() */
182 #include <linux/mutex.h>
183
184 /*
185  * PS/2 floppies have much slower step rates than regular floppies.
186  * It's been recommended that take about 1/4 of the default speed
187  * in some more extreme cases.
188  */
189 static int slow_floppy;
190
191 #include <asm/dma.h>
192 #include <asm/irq.h>
193 #include <asm/system.h>
194 #include <asm/io.h>
195 #include <asm/uaccess.h>
196
197 static int FLOPPY_IRQ = 6;
198 static int FLOPPY_DMA = 2;
199 static int can_use_virtual_dma = 2;
200 /* =======
201  * can use virtual DMA:
202  * 0 = use of virtual DMA disallowed by config
203  * 1 = use of virtual DMA prescribed by config
204  * 2 = no virtual DMA preference configured.  By default try hard DMA,
205  * but fall back on virtual DMA when not enough memory available
206  */
207
208 static int use_virtual_dma;
209 /* =======
210  * use virtual DMA
211  * 0 using hard DMA
212  * 1 using virtual DMA
213  * This variable is set to virtual when a DMA mem problem arises, and
214  * reset back in floppy_grab_irq_and_dma.
215  * It is not safe to reset it in other circumstances, because the floppy
216  * driver may have several buffers in use at once, and we do currently not
217  * record each buffers capabilities
218  */
219
220 static DEFINE_SPINLOCK(floppy_lock);
221
222 static unsigned short virtual_dma_port = 0x3f0;
223 irqreturn_t floppy_interrupt(int irq, void *dev_id);
224 static int set_dor(int fdc, char mask, char data);
225
226 #define K_64    0x10000         /* 64KB */
227
228 /* the following is the mask of allowed drives. By default units 2 and
229  * 3 of both floppy controllers are disabled, because switching on the
230  * motor of these drives causes system hangs on some PCI computers. drive
231  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
232  * a drive is allowed.
233  *
234  * NOTE: This must come before we include the arch floppy header because
235  *       some ports reference this variable from there. -DaveM
236  */
237
238 static int allowed_drive_mask = 0x33;
239
240 #include <asm/floppy.h>
241
242 static int irqdma_allocated;
243
244 #define DEVICE_NAME "floppy"
245
246 #include <linux/blkdev.h>
247 #include <linux/blkpg.h>
248 #include <linux/cdrom.h>        /* for the compatibility eject ioctl */
249 #include <linux/completion.h>
250
251 static struct request *current_req;
252 static struct request_queue *floppy_queue;
253 static void do_fd_request(struct request_queue * q);
254
255 #ifndef fd_get_dma_residue
256 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
257 #endif
258
259 /* Dma Memory related stuff */
260
261 #ifndef fd_dma_mem_free
262 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
263 #endif
264
265 #ifndef fd_dma_mem_alloc
266 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL,get_order(size))
267 #endif
268
269 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
270 {
271 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
272         if (*addr)
273                 return;         /* we have the memory */
274         if (can_use_virtual_dma != 2)
275                 return;         /* no fallback allowed */
276         printk("DMA memory shortage. Temporarily falling back on virtual DMA\n");
277         *addr = (char *)nodma_mem_alloc(l);
278 #else
279         return;
280 #endif
281 }
282
283 /* End dma memory related stuff */
284
285 static unsigned long fake_change;
286 static int initialising = 1;
287
288 #define ITYPE(x) (((x)>>2) & 0x1f)
289 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
290 #define UNIT(x) ((x) & 0x03)    /* drive on fdc */
291 #define FDC(x) (((x) & 0x04) >> 2)      /* fdc of drive */
292         /* reverse mapping from unit and fdc to drive */
293 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
294 #define DP (&drive_params[current_drive])
295 #define DRS (&drive_state[current_drive])
296 #define DRWE (&write_errors[current_drive])
297 #define FDCS (&fdc_state[fdc])
298 #define CLEARF(x) clear_bit(x##_BIT, &DRS->flags)
299 #define SETF(x) set_bit(x##_BIT, &DRS->flags)
300 #define TESTF(x) test_bit(x##_BIT, &DRS->flags)
301
302 #define UDP (&drive_params[drive])
303 #define UDRS (&drive_state[drive])
304 #define UDRWE (&write_errors[drive])
305 #define UFDCS (&fdc_state[FDC(drive)])
306 #define UCLEARF(x) clear_bit(x##_BIT, &UDRS->flags)
307 #define USETF(x) set_bit(x##_BIT, &UDRS->flags)
308 #define UTESTF(x) test_bit(x##_BIT, &UDRS->flags)
309
310 #define DPRINT(format, args...) printk(DEVICE_NAME "%d: " format, current_drive , ## args)
311
312 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
313 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
314
315 #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
316
317 /* read/write */
318 #define COMMAND raw_cmd->cmd[0]
319 #define DR_SELECT raw_cmd->cmd[1]
320 #define TRACK raw_cmd->cmd[2]
321 #define HEAD raw_cmd->cmd[3]
322 #define SECTOR raw_cmd->cmd[4]
323 #define SIZECODE raw_cmd->cmd[5]
324 #define SECT_PER_TRACK raw_cmd->cmd[6]
325 #define GAP raw_cmd->cmd[7]
326 #define SIZECODE2 raw_cmd->cmd[8]
327 #define NR_RW 9
328
329 /* format */
330 #define F_SIZECODE raw_cmd->cmd[2]
331 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
332 #define F_GAP raw_cmd->cmd[4]
333 #define F_FILL raw_cmd->cmd[5]
334 #define NR_F 6
335
336 /*
337  * Maximum disk size (in kilobytes). This default is used whenever the
338  * current disk size is unknown.
339  * [Now it is rather a minimum]
340  */
341 #define MAX_DISK_SIZE 4         /* 3984 */
342
343 /*
344  * globals used by 'result()'
345  */
346 #define MAX_REPLIES 16
347 static unsigned char reply_buffer[MAX_REPLIES];
348 static int inr;                 /* size of reply buffer, when called from interrupt */
349 #define ST0 (reply_buffer[0])
350 #define ST1 (reply_buffer[1])
351 #define ST2 (reply_buffer[2])
352 #define ST3 (reply_buffer[0])   /* result of GETSTATUS */
353 #define R_TRACK (reply_buffer[3])
354 #define R_HEAD (reply_buffer[4])
355 #define R_SECTOR (reply_buffer[5])
356 #define R_SIZECODE (reply_buffer[6])
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 #define CALL(x) if ((x) == -EINTR) return -EINTR
519 #define ECALL(x) if ((ret = (x))) return ret;
520 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
521 #define WAIT(x) _WAIT((x),interruptible)
522 #define IWAIT(x) _WAIT((x),1)
523
524 /* Errors during formatting are counted here. */
525 static int format_errors;
526
527 /* Format request descriptor. */
528 static struct format_descr format_req;
529
530 /*
531  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
532  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
533  * H is head unload time (1=16ms, 2=32ms, etc)
534  */
535
536 /*
537  * Track buffer
538  * Because these are written to by the DMA controller, they must
539  * not contain a 64k byte boundary crossing, or data will be
540  * corrupted/lost.
541  */
542 static char *floppy_track_buffer;
543 static int max_buffer_sectors;
544
545 static int *errors;
546 typedef void (*done_f)(int);
547 static struct cont_t {
548         void (*interrupt)(void);        /* this is called after the interrupt of the
549                                          * main command */
550         void (*redo)(void);     /* this is called to retry the operation */
551         void (*error)(void);    /* this is called to tally an error */
552         done_f done;            /* this is called to say if the operation has
553                                  * succeeded/failed */
554 } *cont;
555
556 static void floppy_ready(void);
557 static void floppy_start(void);
558 static void process_fd_request(void);
559 static void recalibrate_floppy(void);
560 static void floppy_shutdown(unsigned long);
561
562 static int floppy_request_regions(int);
563 static void floppy_release_regions(int);
564 static int floppy_grab_irq_and_dma(void);
565 static void floppy_release_irq_and_dma(void);
566
567 /*
568  * The "reset" variable should be tested whenever an interrupt is scheduled,
569  * after the commands have been sent. This is to ensure that the driver doesn't
570  * get wedged when the interrupt doesn't come because of a failed command.
571  * reset doesn't need to be tested before sending commands, because
572  * output_byte is automatically disabled when reset is set.
573  */
574 #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
575 static void reset_fdc(void);
576
577 /*
578  * These are global variables, as that's the easiest way to give
579  * information to interrupts. They are the data used for the current
580  * request.
581  */
582 #define NO_TRACK -1
583 #define NEED_1_RECAL -2
584 #define NEED_2_RECAL -3
585
586 static int usage_count;
587
588 /* buffer related variables */
589 static int buffer_track = -1;
590 static int buffer_drive = -1;
591 static int buffer_min = -1;
592 static int buffer_max = -1;
593
594 /* fdc related variables, should end up in a struct */
595 static struct floppy_fdc_state fdc_state[N_FDC];
596 static int fdc;                 /* current fdc */
597
598 static struct floppy_struct *_floppy = floppy_type;
599 static unsigned char current_drive;
600 static long current_count_sectors;
601 static unsigned char fsector_t; /* sector in track */
602 static unsigned char in_sector_offset;  /* offset within physical sector,
603                                          * expressed in units of 512 bytes */
604
605 #ifndef fd_eject
606 static inline int fd_eject(int drive)
607 {
608         return -EINVAL;
609 }
610 #endif
611
612 /*
613  * Debugging
614  * =========
615  */
616 #ifdef DEBUGT
617 static long unsigned debugtimer;
618
619 static inline void set_debugt(void)
620 {
621         debugtimer = jiffies;
622 }
623
624 static inline void debugt(const char *message)
625 {
626         if (DP->flags & DEBUGT)
627                 printk("%s dtime=%lu\n", message, jiffies - debugtimer);
628 }
629 #else
630 static inline void set_debugt(void) { }
631 static inline void debugt(const char *message) { }
632 #endif /* DEBUGT */
633
634 typedef void (*timeout_fn) (unsigned long);
635 static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
636
637 static const char *timeout_message;
638
639 #ifdef FLOPPY_SANITY_CHECK
640 static void is_alive(const char *message)
641 {
642         /* this routine checks whether the floppy driver is "alive" */
643         if (test_bit(0, &fdc_busy) && command_status < 2
644             && !timer_pending(&fd_timeout)) {
645                 DPRINT("timeout handler died: %s\n", message);
646         }
647 }
648 #endif
649
650 static void (*do_floppy) (void) = NULL;
651
652 #ifdef FLOPPY_SANITY_CHECK
653
654 #define OLOGSIZE 20
655
656 static void (*lasthandler) (void);
657 static unsigned long interruptjiffies;
658 static unsigned long resultjiffies;
659 static int resultsize;
660 static unsigned long lastredo;
661
662 static struct output_log {
663         unsigned char data;
664         unsigned char status;
665         unsigned long jiffies;
666 } output_log[OLOGSIZE];
667
668 static int output_log_pos;
669 #endif
670
671 #define current_reqD -1
672 #define MAXTIMEOUT -2
673
674 static void __reschedule_timeout(int drive, const char *message, int marg)
675 {
676         if (drive == current_reqD)
677                 drive = current_drive;
678         del_timer(&fd_timeout);
679         if (drive < 0 || drive >= N_DRIVE) {
680                 fd_timeout.expires = jiffies + 20UL * HZ;
681                 drive = 0;
682         } else
683                 fd_timeout.expires = jiffies + UDP->timeout;
684         add_timer(&fd_timeout);
685         if (UDP->flags & FD_DEBUG) {
686                 DPRINT("reschedule timeout ");
687                 printk(message, marg);
688                 printk("\n");
689         }
690         timeout_message = message;
691 }
692
693 static void reschedule_timeout(int drive, const char *message, int marg)
694 {
695         unsigned long flags;
696
697         spin_lock_irqsave(&floppy_lock, flags);
698         __reschedule_timeout(drive, message, marg);
699         spin_unlock_irqrestore(&floppy_lock, flags);
700 }
701
702 #define INFBOUND(a,b) (a)=max_t(int, a, b)
703 #define SUPBOUND(a,b) (a)=min_t(int, a, b)
704
705 /*
706  * Bottom half floppy driver.
707  * ==========================
708  *
709  * This part of the file contains the code talking directly to the hardware,
710  * and also the main service loop (seek-configure-spinup-command)
711  */
712
713 /*
714  * disk change.
715  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
716  * and the last_checked date.
717  *
718  * last_checked is the date of the last check which showed 'no disk change'
719  * FD_DISK_CHANGE is set under two conditions:
720  * 1. The floppy has been changed after some i/o to that floppy already
721  *    took place.
722  * 2. No floppy disk is in the drive. This is done in order to ensure that
723  *    requests are quickly flushed in case there is no disk in the drive. It
724  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
725  *    the drive.
726  *
727  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
728  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
729  *  each seek. If a disk is present, the disk change line should also be
730  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
731  *  change line is set, this means either that no disk is in the drive, or
732  *  that it has been removed since the last seek.
733  *
734  * This means that we really have a third possibility too:
735  *  The floppy has been changed after the last seek.
736  */
737
738 static int disk_change(int drive)
739 {
740         int fdc = FDC(drive);
741
742 #ifdef FLOPPY_SANITY_CHECK
743         if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
744                 DPRINT("WARNING disk change called early\n");
745         if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
746             (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
747                 DPRINT("probing disk change on unselected drive\n");
748                 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
749                        (unsigned int)FDCS->dor);
750         }
751 #endif
752
753 #ifdef DCL_DEBUG
754         if (UDP->flags & FD_DEBUG) {
755                 DPRINT("checking disk change line for drive %d\n", drive);
756                 DPRINT("jiffies=%lu\n", jiffies);
757                 DPRINT("disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
758                 DPRINT("flags=%lx\n", UDRS->flags);
759         }
760 #endif
761         if (UDP->flags & FD_BROKEN_DCL)
762                 return UTESTF(FD_DISK_CHANGED);
763         if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
764                 USETF(FD_VERIFY);       /* verify write protection */
765                 if (UDRS->maxblock) {
766                         /* mark it changed */
767                         USETF(FD_DISK_CHANGED);
768                 }
769
770                 /* invalidate its geometry */
771                 if (UDRS->keep_data >= 0) {
772                         if ((UDP->flags & FTD_MSG) &&
773                             current_type[drive] != NULL)
774                                 DPRINT("Disk type is undefined after "
775                                        "disk change\n");
776                         current_type[drive] = NULL;
777                         floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
778                 }
779
780                 return 1;
781         } else {
782                 UDRS->last_checked = jiffies;
783                 UCLEARF(FD_DISK_NEWCHANGE);
784         }
785         return 0;
786 }
787
788 static inline int is_selected(int dor, int unit)
789 {
790         return ((dor & (0x10 << unit)) && (dor & 3) == unit);
791 }
792
793 static int set_dor(int fdc, char mask, char data)
794 {
795         unsigned char unit;
796         unsigned char drive;
797         unsigned char newdor;
798         unsigned char olddor;
799
800         if (FDCS->address == -1)
801                 return -1;
802
803         olddor = FDCS->dor;
804         newdor = (olddor & mask) | data;
805         if (newdor != olddor) {
806                 unit = olddor & 0x3;
807                 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
808                         drive = REVDRIVE(fdc, unit);
809 #ifdef DCL_DEBUG
810                         if (UDP->flags & FD_DEBUG) {
811                                 DPRINT("calling disk change from set_dor\n");
812                         }
813 #endif
814                         disk_change(drive);
815                 }
816                 FDCS->dor = newdor;
817                 fd_outb(newdor, FD_DOR);
818
819                 unit = newdor & 0x3;
820                 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
821                         drive = REVDRIVE(fdc, unit);
822                         UDRS->select_date = jiffies;
823                 }
824         }
825         return olddor;
826 }
827
828 static void twaddle(void)
829 {
830         if (DP->select_delay)
831                 return;
832         fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
833         fd_outb(FDCS->dor, FD_DOR);
834         DRS->select_date = jiffies;
835 }
836
837 /* reset all driver information about the current fdc. This is needed after
838  * a reset, and after a raw command. */
839 static void reset_fdc_info(int mode)
840 {
841         int drive;
842
843         FDCS->spec1 = FDCS->spec2 = -1;
844         FDCS->need_configure = 1;
845         FDCS->perp_mode = 1;
846         FDCS->rawcmd = 0;
847         for (drive = 0; drive < N_DRIVE; drive++)
848                 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
849                         UDRS->track = NEED_2_RECAL;
850 }
851
852 /* selects the fdc and drive, and enables the fdc's input/dma. */
853 static void set_fdc(int drive)
854 {
855         if (drive >= 0 && drive < N_DRIVE) {
856                 fdc = FDC(drive);
857                 current_drive = drive;
858         }
859         if (fdc != 1 && fdc != 0) {
860                 printk("bad fdc value\n");
861                 return;
862         }
863         set_dor(fdc, ~0, 8);
864 #if N_FDC > 1
865         set_dor(1 - fdc, ~8, 0);
866 #endif
867         if (FDCS->rawcmd == 2)
868                 reset_fdc_info(1);
869         if (fd_inb(FD_STATUS) != STATUS_READY)
870                 FDCS->reset = 1;
871 }
872
873 /* locks the driver */
874 static int _lock_fdc(int drive, int interruptible, int line)
875 {
876         if (!usage_count) {
877                 printk(KERN_ERR
878                        "Trying to lock fdc while usage count=0 at line %d\n",
879                        line);
880                 return -1;
881         }
882
883         if (test_and_set_bit(0, &fdc_busy)) {
884                 DECLARE_WAITQUEUE(wait, current);
885                 add_wait_queue(&fdc_wait, &wait);
886
887                 for (;;) {
888                         set_current_state(TASK_INTERRUPTIBLE);
889
890                         if (!test_and_set_bit(0, &fdc_busy))
891                                 break;
892
893                         schedule();
894
895                         if (!NO_SIGNAL) {
896                                 remove_wait_queue(&fdc_wait, &wait);
897                                 return -EINTR;
898                         }
899                 }
900
901                 set_current_state(TASK_RUNNING);
902                 remove_wait_queue(&fdc_wait, &wait);
903                 flush_scheduled_work();
904         }
905         command_status = FD_COMMAND_NONE;
906
907         __reschedule_timeout(drive, "lock fdc", 0);
908         set_fdc(drive);
909         return 0;
910 }
911
912 #define lock_fdc(drive,interruptible) _lock_fdc(drive,interruptible, __LINE__)
913
914 #define LOCK_FDC(drive,interruptible) \
915 if (lock_fdc(drive,interruptible)) return -EINTR;
916
917 /* unlocks the driver */
918 static inline void unlock_fdc(void)
919 {
920         unsigned long flags;
921
922         raw_cmd = NULL;
923         if (!test_bit(0, &fdc_busy))
924                 DPRINT("FDC access conflict!\n");
925
926         if (do_floppy)
927                 DPRINT("device interrupt still active at FDC release: %p!\n",
928                        do_floppy);
929         command_status = FD_COMMAND_NONE;
930         spin_lock_irqsave(&floppy_lock, flags);
931         del_timer(&fd_timeout);
932         cont = NULL;
933         clear_bit(0, &fdc_busy);
934         if (elv_next_request(floppy_queue))
935                 do_fd_request(floppy_queue);
936         spin_unlock_irqrestore(&floppy_lock, flags);
937         wake_up(&fdc_wait);
938 }
939
940 /* switches the motor off after a given timeout */
941 static void motor_off_callback(unsigned long nr)
942 {
943         unsigned char mask = ~(0x10 << UNIT(nr));
944
945         set_dor(FDC(nr), mask, 0);
946 }
947
948 /* schedules motor off */
949 static void floppy_off(unsigned int drive)
950 {
951         unsigned long volatile delta;
952         int fdc = FDC(drive);
953
954         if (!(FDCS->dor & (0x10 << UNIT(drive))))
955                 return;
956
957         del_timer(motor_off_timer + drive);
958
959         /* make spindle stop in a position which minimizes spinup time
960          * next time */
961         if (UDP->rps) {
962                 delta = jiffies - UDRS->first_read_date + HZ -
963                     UDP->spindown_offset;
964                 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
965                 motor_off_timer[drive].expires =
966                     jiffies + UDP->spindown - delta;
967         }
968         add_timer(motor_off_timer + drive);
969 }
970
971 /*
972  * cycle through all N_DRIVE floppy drives, for disk change testing.
973  * stopping at current drive. This is done before any long operation, to
974  * be sure to have up to date disk change information.
975  */
976 static void scandrives(void)
977 {
978         int i;
979         int drive;
980         int saved_drive;
981
982         if (DP->select_delay)
983                 return;
984
985         saved_drive = current_drive;
986         for (i = 0; i < N_DRIVE; i++) {
987                 drive = (saved_drive + i + 1) % N_DRIVE;
988                 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
989                         continue;       /* skip closed drives */
990                 set_fdc(drive);
991                 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
992                       (0x10 << UNIT(drive))))
993                         /* switch the motor off again, if it was off to
994                          * begin with */
995                         set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
996         }
997         set_fdc(saved_drive);
998 }
999
1000 static void empty(void)
1001 {
1002 }
1003
1004 static DECLARE_WORK(floppy_work, NULL);
1005
1006 static void schedule_bh(void (*handler) (void))
1007 {
1008         PREPARE_WORK(&floppy_work, (work_func_t)handler);
1009         schedule_work(&floppy_work);
1010 }
1011
1012 static DEFINE_TIMER(fd_timer, NULL, 0, 0);
1013
1014 static void cancel_activity(void)
1015 {
1016         unsigned long flags;
1017
1018         spin_lock_irqsave(&floppy_lock, flags);
1019         do_floppy = NULL;
1020         PREPARE_WORK(&floppy_work, (work_func_t)empty);
1021         del_timer(&fd_timer);
1022         spin_unlock_irqrestore(&floppy_lock, flags);
1023 }
1024
1025 /* this function makes sure that the disk stays in the drive during the
1026  * transfer */
1027 static void fd_watchdog(void)
1028 {
1029 #ifdef DCL_DEBUG
1030         if (DP->flags & FD_DEBUG) {
1031                 DPRINT("calling disk change from watchdog\n");
1032         }
1033 #endif
1034
1035         if (disk_change(current_drive)) {
1036                 DPRINT("disk removed during i/o\n");
1037                 cancel_activity();
1038                 cont->done(0);
1039                 reset_fdc();
1040         } else {
1041                 del_timer(&fd_timer);
1042                 fd_timer.function = (timeout_fn) fd_watchdog;
1043                 fd_timer.expires = jiffies + HZ / 10;
1044                 add_timer(&fd_timer);
1045         }
1046 }
1047
1048 static void main_command_interrupt(void)
1049 {
1050         del_timer(&fd_timer);
1051         cont->interrupt();
1052 }
1053
1054 /* waits for a delay (spinup or select) to pass */
1055 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1056 {
1057         if (FDCS->reset) {
1058                 reset_fdc();    /* do the reset during sleep to win time
1059                                  * if we don't need to sleep, it's a good
1060                                  * occasion anyways */
1061                 return 1;
1062         }
1063
1064         if (time_before(jiffies, delay)) {
1065                 del_timer(&fd_timer);
1066                 fd_timer.function = function;
1067                 fd_timer.expires = delay;
1068                 add_timer(&fd_timer);
1069                 return 1;
1070         }
1071         return 0;
1072 }
1073
1074 static DEFINE_SPINLOCK(floppy_hlt_lock);
1075 static int hlt_disabled;
1076 static void floppy_disable_hlt(void)
1077 {
1078         unsigned long flags;
1079
1080         spin_lock_irqsave(&floppy_hlt_lock, flags);
1081         if (!hlt_disabled) {
1082                 hlt_disabled = 1;
1083 #ifdef HAVE_DISABLE_HLT
1084                 disable_hlt();
1085 #endif
1086         }
1087         spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1088 }
1089
1090 static void floppy_enable_hlt(void)
1091 {
1092         unsigned long flags;
1093
1094         spin_lock_irqsave(&floppy_hlt_lock, flags);
1095         if (hlt_disabled) {
1096                 hlt_disabled = 0;
1097 #ifdef HAVE_DISABLE_HLT
1098                 enable_hlt();
1099 #endif
1100         }
1101         spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1102 }
1103
1104 static void setup_DMA(void)
1105 {
1106         unsigned long f;
1107
1108 #ifdef FLOPPY_SANITY_CHECK
1109         if (raw_cmd->length == 0) {
1110                 int i;
1111
1112                 printk("zero dma transfer size:");
1113                 for (i = 0; i < raw_cmd->cmd_count; i++)
1114                         printk("%x,", raw_cmd->cmd[i]);
1115                 printk("\n");
1116                 cont->done(0);
1117                 FDCS->reset = 1;
1118                 return;
1119         }
1120         if (((unsigned long)raw_cmd->kernel_data) % 512) {
1121                 printk("non aligned address: %p\n", raw_cmd->kernel_data);
1122                 cont->done(0);
1123                 FDCS->reset = 1;
1124                 return;
1125         }
1126 #endif
1127         f = claim_dma_lock();
1128         fd_disable_dma();
1129 #ifdef fd_dma_setup
1130         if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1131                          (raw_cmd->flags & FD_RAW_READ) ?
1132                          DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1133                 release_dma_lock(f);
1134                 cont->done(0);
1135                 FDCS->reset = 1;
1136                 return;
1137         }
1138         release_dma_lock(f);
1139 #else
1140         fd_clear_dma_ff();
1141         fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1142         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1143                         DMA_MODE_READ : DMA_MODE_WRITE);
1144         fd_set_dma_addr(raw_cmd->kernel_data);
1145         fd_set_dma_count(raw_cmd->length);
1146         virtual_dma_port = FDCS->address;
1147         fd_enable_dma();
1148         release_dma_lock(f);
1149 #endif
1150         floppy_disable_hlt();
1151 }
1152
1153 static void show_floppy(void);
1154
1155 /* waits until the fdc becomes ready */
1156 static int wait_til_ready(void)
1157 {
1158         int status;
1159         int counter;
1160
1161         if (FDCS->reset)
1162                 return -1;
1163         for (counter = 0; counter < 10000; counter++) {
1164                 status = fd_inb(FD_STATUS);
1165                 if (status & STATUS_READY)
1166                         return status;
1167         }
1168         if (!initialising) {
1169                 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1170                 show_floppy();
1171         }
1172         FDCS->reset = 1;
1173         return -1;
1174 }
1175
1176 /* sends a command byte to the fdc */
1177 static int output_byte(char byte)
1178 {
1179         int status;
1180
1181         if ((status = wait_til_ready()) < 0)
1182                 return -1;
1183         if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY) {
1184                 fd_outb(byte, FD_DATA);
1185 #ifdef FLOPPY_SANITY_CHECK
1186                 output_log[output_log_pos].data = byte;
1187                 output_log[output_log_pos].status = status;
1188                 output_log[output_log_pos].jiffies = jiffies;
1189                 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1190 #endif
1191                 return 0;
1192         }
1193         FDCS->reset = 1;
1194         if (!initialising) {
1195                 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1196                        byte, fdc, status);
1197                 show_floppy();
1198         }
1199         return -1;
1200 }
1201
1202 #define LAST_OUT(x) if (output_byte(x)<0){ reset_fdc();return;}
1203
1204 /* gets the response from the fdc */
1205 static int result(void)
1206 {
1207         int i;
1208         int status = 0;
1209
1210         for (i = 0; i < MAX_REPLIES; i++) {
1211                 if ((status = wait_til_ready()) < 0)
1212                         break;
1213                 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1214                 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1215 #ifdef FLOPPY_SANITY_CHECK
1216                         resultjiffies = jiffies;
1217                         resultsize = i;
1218 #endif
1219                         return i;
1220                 }
1221                 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1222                         reply_buffer[i] = fd_inb(FD_DATA);
1223                 else
1224                         break;
1225         }
1226         if (!initialising) {
1227                 DPRINT
1228                     ("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1229                      fdc, status, i);
1230                 show_floppy();
1231         }
1232         FDCS->reset = 1;
1233         return -1;
1234 }
1235
1236 #define MORE_OUTPUT -2
1237 /* does the fdc need more output? */
1238 static int need_more_output(void)
1239 {
1240         int status;
1241
1242         if ((status = wait_til_ready()) < 0)
1243                 return -1;
1244         if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY)
1245                 return MORE_OUTPUT;
1246         return result();
1247 }
1248
1249 /* Set perpendicular mode as required, based on data rate, if supported.
1250  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1251  */
1252 static inline void perpendicular_mode(void)
1253 {
1254         unsigned char perp_mode;
1255
1256         if (raw_cmd->rate & 0x40) {
1257                 switch (raw_cmd->rate & 3) {
1258                 case 0:
1259                         perp_mode = 2;
1260                         break;
1261                 case 3:
1262                         perp_mode = 3;
1263                         break;
1264                 default:
1265                         DPRINT("Invalid data rate for perpendicular mode!\n");
1266                         cont->done(0);
1267                         FDCS->reset = 1;        /* convenient way to return to
1268                                                  * redo without to much hassle (deep
1269                                                  * stack et al. */
1270                         return;
1271                 }
1272         } else
1273                 perp_mode = 0;
1274
1275         if (FDCS->perp_mode == perp_mode)
1276                 return;
1277         if (FDCS->version >= FDC_82077_ORIG) {
1278                 output_byte(FD_PERPENDICULAR);
1279                 output_byte(perp_mode);
1280                 FDCS->perp_mode = perp_mode;
1281         } else if (perp_mode) {
1282                 DPRINT("perpendicular mode not supported by this FDC.\n");
1283         }
1284 }                               /* perpendicular_mode */
1285
1286 static int fifo_depth = 0xa;
1287 static int no_fifo;
1288
1289 static int fdc_configure(void)
1290 {
1291         /* Turn on FIFO */
1292         output_byte(FD_CONFIGURE);
1293         if (need_more_output() != MORE_OUTPUT)
1294                 return 0;
1295         output_byte(0);
1296         output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1297         output_byte(0);         /* pre-compensation from track
1298                                    0 upwards */
1299         return 1;
1300 }
1301
1302 #define NOMINAL_DTR 500
1303
1304 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1305  * head load time, and DMA disable flag to values needed by floppy.
1306  *
1307  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1308  * to account for the data rate-based scaling done by the 82072 and 82077
1309  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1310  * 8272a).
1311  *
1312  * Note that changing the data transfer rate has a (probably deleterious)
1313  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1314  * fdc_specify is called again after each data transfer rate
1315  * change.
1316  *
1317  * srt: 1000 to 16000 in microseconds
1318  * hut: 16 to 240 milliseconds
1319  * hlt: 2 to 254 milliseconds
1320  *
1321  * These values are rounded up to the next highest available delay time.
1322  */
1323 static void fdc_specify(void)
1324 {
1325         unsigned char spec1;
1326         unsigned char spec2;
1327         unsigned long srt;
1328         unsigned long hlt;
1329         unsigned long hut;
1330         unsigned long dtr = NOMINAL_DTR;
1331         unsigned long scale_dtr = NOMINAL_DTR;
1332         int hlt_max_code = 0x7f;
1333         int hut_max_code = 0xf;
1334
1335         if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1336                 fdc_configure();
1337                 FDCS->need_configure = 0;
1338         }
1339
1340         switch (raw_cmd->rate & 0x03) {
1341         case 3:
1342                 dtr = 1000;
1343                 break;
1344         case 1:
1345                 dtr = 300;
1346                 if (FDCS->version >= FDC_82078) {
1347                         /* chose the default rate table, not the one
1348                          * where 1 = 2 Mbps */
1349                         output_byte(FD_DRIVESPEC);
1350                         if (need_more_output() == MORE_OUTPUT) {
1351                                 output_byte(UNIT(current_drive));
1352                                 output_byte(0xc0);
1353                         }
1354                 }
1355                 break;
1356         case 2:
1357                 dtr = 250;
1358                 break;
1359         }
1360
1361         if (FDCS->version >= FDC_82072) {
1362                 scale_dtr = dtr;
1363                 hlt_max_code = 0x00;    /* 0==256msec*dtr0/dtr (not linear!) */
1364                 hut_max_code = 0x0;     /* 0==256msec*dtr0/dtr (not linear!) */
1365         }
1366
1367         /* Convert step rate from microseconds to milliseconds and 4 bits */
1368         srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1369         if (slow_floppy) {
1370                 srt = srt / 4;
1371         }
1372         SUPBOUND(srt, 0xf);
1373         INFBOUND(srt, 0);
1374
1375         hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1376         if (hlt < 0x01)
1377                 hlt = 0x01;
1378         else if (hlt > 0x7f)
1379                 hlt = hlt_max_code;
1380
1381         hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1382         if (hut < 0x1)
1383                 hut = 0x1;
1384         else if (hut > 0xf)
1385                 hut = hut_max_code;
1386
1387         spec1 = (srt << 4) | hut;
1388         spec2 = (hlt << 1) | (use_virtual_dma & 1);
1389
1390         /* If these parameters did not change, just return with success */
1391         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1392                 /* Go ahead and set spec1 and spec2 */
1393                 output_byte(FD_SPECIFY);
1394                 output_byte(FDCS->spec1 = spec1);
1395                 output_byte(FDCS->spec2 = spec2);
1396         }
1397 }                               /* fdc_specify */
1398
1399 /* Set the FDC's data transfer rate on behalf of the specified drive.
1400  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1401  * of the specify command (i.e. using the fdc_specify function).
1402  */
1403 static int fdc_dtr(void)
1404 {
1405         /* If data rate not already set to desired value, set it. */
1406         if ((raw_cmd->rate & 3) == FDCS->dtr)
1407                 return 0;
1408
1409         /* Set dtr */
1410         fd_outb(raw_cmd->rate & 3, FD_DCR);
1411
1412         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1413          * need a stabilization period of several milliseconds to be
1414          * enforced after data rate changes before R/W operations.
1415          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1416          */
1417         FDCS->dtr = raw_cmd->rate & 3;
1418         return (fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1419                                        (timeout_fn) floppy_ready));
1420 }                               /* fdc_dtr */
1421
1422 static void tell_sector(void)
1423 {
1424         printk(": track %d, head %d, sector %d, size %d",
1425                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1426 }                               /* tell_sector */
1427
1428 /*
1429  * OK, this error interpreting routine is called after a
1430  * DMA read/write has succeeded
1431  * or failed, so we check the results, and copy any buffers.
1432  * hhb: Added better error reporting.
1433  * ak: Made this into a separate routine.
1434  */
1435 static int interpret_errors(void)
1436 {
1437         char bad;
1438
1439         if (inr != 7) {
1440                 DPRINT("-- FDC reply error");
1441                 FDCS->reset = 1;
1442                 return 1;
1443         }
1444
1445         /* check IC to find cause of interrupt */
1446         switch (ST0 & ST0_INTR) {
1447         case 0x40:              /* error occurred during command execution */
1448                 if (ST1 & ST1_EOC)
1449                         return 0;       /* occurs with pseudo-DMA */
1450                 bad = 1;
1451                 if (ST1 & ST1_WP) {
1452                         DPRINT("Drive is write protected\n");
1453                         CLEARF(FD_DISK_WRITABLE);
1454                         cont->done(0);
1455                         bad = 2;
1456                 } else if (ST1 & ST1_ND) {
1457                         SETF(FD_NEED_TWADDLE);
1458                 } else if (ST1 & ST1_OR) {
1459                         if (DP->flags & FTD_MSG)
1460                                 DPRINT("Over/Underrun - retrying\n");
1461                         bad = 0;
1462                 } else if (*errors >= DP->max_errors.reporting) {
1463                         DPRINT("");
1464                         if (ST0 & ST0_ECE) {
1465                                 printk("Recalibrate failed!");
1466                         } else if (ST2 & ST2_CRC) {
1467                                 printk("data CRC error");
1468                                 tell_sector();
1469                         } else if (ST1 & ST1_CRC) {
1470                                 printk("CRC error");
1471                                 tell_sector();
1472                         } else if ((ST1 & (ST1_MAM | ST1_ND))
1473                                    || (ST2 & ST2_MAM)) {
1474                                 if (!probing) {
1475                                         printk("sector not found");
1476                                         tell_sector();
1477                                 } else
1478                                         printk("probe failed...");
1479                         } else if (ST2 & ST2_WC) {      /* seek error */
1480                                 printk("wrong cylinder");
1481                         } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1482                                 printk("bad cylinder");
1483                         } else {
1484                                 printk
1485                                     ("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1486                                      ST0, ST1, ST2);
1487                                 tell_sector();
1488                         }
1489                         printk("\n");
1490                 }
1491                 if (ST2 & ST2_WC || ST2 & ST2_BC)
1492                         /* wrong cylinder => recal */
1493                         DRS->track = NEED_2_RECAL;
1494                 return bad;
1495         case 0x80:              /* invalid command given */
1496                 DPRINT("Invalid FDC command given!\n");
1497                 cont->done(0);
1498                 return 2;
1499         case 0xc0:
1500                 DPRINT("Abnormal termination caused by polling\n");
1501                 cont->error();
1502                 return 2;
1503         default:                /* (0) Normal command termination */
1504                 return 0;
1505         }
1506 }
1507
1508 /*
1509  * This routine is called when everything should be correctly set up
1510  * for the transfer (i.e. floppy motor is on, the correct floppy is
1511  * selected, and the head is sitting on the right track).
1512  */
1513 static void setup_rw_floppy(void)
1514 {
1515         int i;
1516         int r;
1517         int flags;
1518         int dflags;
1519         unsigned long ready_date;
1520         timeout_fn function;
1521
1522         flags = raw_cmd->flags;
1523         if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1524                 flags |= FD_RAW_INTR;
1525
1526         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1527                 ready_date = DRS->spinup_date + DP->spinup;
1528                 /* If spinup will take a long time, rerun scandrives
1529                  * again just before spinup completion. Beware that
1530                  * after scandrives, we must again wait for selection.
1531                  */
1532                 if (time_after(ready_date, jiffies + DP->select_delay)) {
1533                         ready_date -= DP->select_delay;
1534                         function = (timeout_fn) floppy_start;
1535                 } else
1536                         function = (timeout_fn) setup_rw_floppy;
1537
1538                 /* wait until the floppy is spinning fast enough */
1539                 if (fd_wait_for_completion(ready_date, function))
1540                         return;
1541         }
1542         dflags = DRS->flags;
1543
1544         if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1545                 setup_DMA();
1546
1547         if (flags & FD_RAW_INTR)
1548                 do_floppy = main_command_interrupt;
1549
1550         r = 0;
1551         for (i = 0; i < raw_cmd->cmd_count; i++)
1552                 r |= output_byte(raw_cmd->cmd[i]);
1553
1554         debugt("rw_command: ");
1555
1556         if (r) {
1557                 cont->error();
1558                 reset_fdc();
1559                 return;
1560         }
1561
1562         if (!(flags & FD_RAW_INTR)) {
1563                 inr = result();
1564                 cont->interrupt();
1565         } else if (flags & FD_RAW_NEED_DISK)
1566                 fd_watchdog();
1567 }
1568
1569 static int blind_seek;
1570
1571 /*
1572  * This is the routine called after every seek (or recalibrate) interrupt
1573  * from the floppy controller.
1574  */
1575 static void seek_interrupt(void)
1576 {
1577         debugt("seek interrupt:");
1578         if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1579                 DPRINT("seek failed\n");
1580                 DRS->track = NEED_2_RECAL;
1581                 cont->error();
1582                 cont->redo();
1583                 return;
1584         }
1585         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1586 #ifdef DCL_DEBUG
1587                 if (DP->flags & FD_DEBUG) {
1588                         DPRINT
1589                             ("clearing NEWCHANGE flag because of effective seek\n");
1590                         DPRINT("jiffies=%lu\n", jiffies);
1591                 }
1592 #endif
1593                 CLEARF(FD_DISK_NEWCHANGE);      /* effective seek */
1594                 DRS->select_date = jiffies;
1595         }
1596         DRS->track = ST1;
1597         floppy_ready();
1598 }
1599
1600 static void check_wp(void)
1601 {
1602         if (TESTF(FD_VERIFY)) {
1603                 /* check write protection */
1604                 output_byte(FD_GETSTATUS);
1605                 output_byte(UNIT(current_drive));
1606                 if (result() != 1) {
1607                         FDCS->reset = 1;
1608                         return;
1609                 }
1610                 CLEARF(FD_VERIFY);
1611                 CLEARF(FD_NEED_TWADDLE);
1612 #ifdef DCL_DEBUG
1613                 if (DP->flags & FD_DEBUG) {
1614                         DPRINT("checking whether disk is write protected\n");
1615                         DPRINT("wp=%x\n", ST3 & 0x40);
1616                 }
1617 #endif
1618                 if (!(ST3 & 0x40))
1619                         SETF(FD_DISK_WRITABLE);
1620                 else
1621                         CLEARF(FD_DISK_WRITABLE);
1622         }
1623 }
1624
1625 static void seek_floppy(void)
1626 {
1627         int track;
1628
1629         blind_seek = 0;
1630
1631 #ifdef DCL_DEBUG
1632         if (DP->flags & FD_DEBUG) {
1633                 DPRINT("calling disk change from seek\n");
1634         }
1635 #endif
1636
1637         if (!TESTF(FD_DISK_NEWCHANGE) &&
1638             disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1639                 /* the media changed flag should be cleared after the seek.
1640                  * If it isn't, this means that there is really no disk in
1641                  * the drive.
1642                  */
1643                 SETF(FD_DISK_CHANGED);
1644                 cont->done(0);
1645                 cont->redo();
1646                 return;
1647         }
1648         if (DRS->track <= NEED_1_RECAL) {
1649                 recalibrate_floppy();
1650                 return;
1651         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1652                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1653                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1654                 /* we seek to clear the media-changed condition. Does anybody
1655                  * know a more elegant way, which works on all drives? */
1656                 if (raw_cmd->track)
1657                         track = raw_cmd->track - 1;
1658                 else {
1659                         if (DP->flags & FD_SILENT_DCL_CLEAR) {
1660                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1661                                 blind_seek = 1;
1662                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1663                         }
1664                         track = 1;
1665                 }
1666         } else {
1667                 check_wp();
1668                 if (raw_cmd->track != DRS->track &&
1669                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1670                         track = raw_cmd->track;
1671                 else {
1672                         setup_rw_floppy();
1673                         return;
1674                 }
1675         }
1676
1677         do_floppy = seek_interrupt;
1678         output_byte(FD_SEEK);
1679         output_byte(UNIT(current_drive));
1680         LAST_OUT(track);
1681         debugt("seek command:");
1682 }
1683
1684 static void recal_interrupt(void)
1685 {
1686         debugt("recal interrupt:");
1687         if (inr != 2)
1688                 FDCS->reset = 1;
1689         else if (ST0 & ST0_ECE) {
1690                 switch (DRS->track) {
1691                 case NEED_1_RECAL:
1692                         debugt("recal interrupt need 1 recal:");
1693                         /* after a second recalibrate, we still haven't
1694                          * reached track 0. Probably no drive. Raise an
1695                          * error, as failing immediately might upset
1696                          * computers possessed by the Devil :-) */
1697                         cont->error();
1698                         cont->redo();
1699                         return;
1700                 case NEED_2_RECAL:
1701                         debugt("recal interrupt need 2 recal:");
1702                         /* If we already did a recalibrate,
1703                          * and we are not at track 0, this
1704                          * means we have moved. (The only way
1705                          * not to move at recalibration is to
1706                          * be already at track 0.) Clear the
1707                          * new change flag */
1708 #ifdef DCL_DEBUG
1709                         if (DP->flags & FD_DEBUG) {
1710                                 DPRINT
1711                                     ("clearing NEWCHANGE flag because of second recalibrate\n");
1712                         }
1713 #endif
1714
1715                         CLEARF(FD_DISK_NEWCHANGE);
1716                         DRS->select_date = jiffies;
1717                         /* fall through */
1718                 default:
1719                         debugt("recal interrupt default:");
1720                         /* Recalibrate moves the head by at
1721                          * most 80 steps. If after one
1722                          * recalibrate we don't have reached
1723                          * track 0, this might mean that we
1724                          * started beyond track 80.  Try
1725                          * again.  */
1726                         DRS->track = NEED_1_RECAL;
1727                         break;
1728                 }
1729         } else
1730                 DRS->track = ST1;
1731         floppy_ready();
1732 }
1733
1734 static void print_result(char *message, int inr)
1735 {
1736         int i;
1737
1738         DPRINT("%s ", message);
1739         if (inr >= 0)
1740                 for (i = 0; i < inr; i++)
1741                         printk("repl[%d]=%x ", i, reply_buffer[i]);
1742         printk("\n");
1743 }
1744
1745 /* interrupt handler. Note that this can be called externally on the Sparc */
1746 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1747 {
1748         int do_print;
1749         unsigned long f;
1750         void (*handler)(void) = do_floppy;
1751
1752         lasthandler = handler;
1753         interruptjiffies = jiffies;
1754
1755         f = claim_dma_lock();
1756         fd_disable_dma();
1757         release_dma_lock(f);
1758
1759         floppy_enable_hlt();
1760         do_floppy = NULL;
1761         if (fdc >= N_FDC || FDCS->address == -1) {
1762                 /* we don't even know which FDC is the culprit */
1763                 printk("DOR0=%x\n", fdc_state[0].dor);
1764                 printk("floppy interrupt on bizarre fdc %d\n", fdc);
1765                 printk("handler=%p\n", handler);
1766                 is_alive("bizarre fdc");
1767                 return IRQ_NONE;
1768         }
1769
1770         FDCS->reset = 0;
1771         /* We have to clear the reset flag here, because apparently on boxes
1772          * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1773          * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1774          * emission of the SENSEI's.
1775          * It is OK to emit floppy commands because we are in an interrupt
1776          * handler here, and thus we have to fear no interference of other
1777          * activity.
1778          */
1779
1780         do_print = !handler && print_unex && !initialising;
1781
1782         inr = result();
1783         if (do_print)
1784                 print_result("unexpected interrupt", inr);
1785         if (inr == 0) {
1786                 int max_sensei = 4;
1787                 do {
1788                         output_byte(FD_SENSEI);
1789                         inr = result();
1790                         if (do_print)
1791                                 print_result("sensei", inr);
1792                         max_sensei--;
1793                 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2
1794                          && max_sensei);
1795         }
1796         if (!handler) {
1797                 FDCS->reset = 1;
1798                 return IRQ_NONE;
1799         }
1800         schedule_bh(handler);
1801         is_alive("normal interrupt end");
1802
1803         /* FIXME! Was it really for us? */
1804         return IRQ_HANDLED;
1805 }
1806
1807 static void recalibrate_floppy(void)
1808 {
1809         debugt("recalibrate floppy:");
1810         do_floppy = recal_interrupt;
1811         output_byte(FD_RECALIBRATE);
1812         LAST_OUT(UNIT(current_drive));
1813 }
1814
1815 /*
1816  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1817  */
1818 static void reset_interrupt(void)
1819 {
1820         debugt("reset interrupt:");
1821         result();               /* get the status ready for set_fdc */
1822         if (FDCS->reset) {
1823                 printk("reset set in interrupt, calling %p\n", cont->error);
1824                 cont->error();  /* a reset just after a reset. BAD! */
1825         }
1826         cont->redo();
1827 }
1828
1829 /*
1830  * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1831  * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1832  */
1833 static void reset_fdc(void)
1834 {
1835         unsigned long flags;
1836
1837         do_floppy = reset_interrupt;
1838         FDCS->reset = 0;
1839         reset_fdc_info(0);
1840
1841         /* Pseudo-DMA may intercept 'reset finished' interrupt.  */
1842         /* Irrelevant for systems with true DMA (i386).          */
1843
1844         flags = claim_dma_lock();
1845         fd_disable_dma();
1846         release_dma_lock(flags);
1847
1848         if (FDCS->version >= FDC_82072A)
1849                 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1850         else {
1851                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1852                 udelay(FD_RESET_DELAY);
1853                 fd_outb(FDCS->dor, FD_DOR);
1854         }
1855 }
1856
1857 static void show_floppy(void)
1858 {
1859         int i;
1860
1861         printk("\n");
1862         printk("floppy driver state\n");
1863         printk("-------------------\n");
1864         printk("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n",
1865                jiffies, interruptjiffies, jiffies - interruptjiffies,
1866                lasthandler);
1867
1868 #ifdef FLOPPY_SANITY_CHECK
1869         printk("timeout_message=%s\n", timeout_message);
1870         printk("last output bytes:\n");
1871         for (i = 0; i < OLOGSIZE; i++)
1872                 printk("%2x %2x %lu\n",
1873                        output_log[(i + output_log_pos) % OLOGSIZE].data,
1874                        output_log[(i + output_log_pos) % OLOGSIZE].status,
1875                        output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1876         printk("last result at %lu\n", resultjiffies);
1877         printk("last redo_fd_request at %lu\n", lastredo);
1878         for (i = 0; i < resultsize; i++) {
1879                 printk("%2x ", reply_buffer[i]);
1880         }
1881         printk("\n");
1882 #endif
1883
1884         printk("status=%x\n", fd_inb(FD_STATUS));
1885         printk("fdc_busy=%lu\n", fdc_busy);
1886         if (do_floppy)
1887                 printk("do_floppy=%p\n", do_floppy);
1888         if (work_pending(&floppy_work))
1889                 printk("floppy_work.func=%p\n", floppy_work.func);
1890         if (timer_pending(&fd_timer))
1891                 printk("fd_timer.function=%p\n", fd_timer.function);
1892         if (timer_pending(&fd_timeout)) {
1893                 printk("timer_function=%p\n", fd_timeout.function);
1894                 printk("expires=%lu\n", fd_timeout.expires - jiffies);
1895                 printk("now=%lu\n", jiffies);
1896         }
1897         printk("cont=%p\n", cont);
1898         printk("current_req=%p\n", current_req);
1899         printk("command_status=%d\n", command_status);
1900         printk("\n");
1901 }
1902
1903 static void floppy_shutdown(unsigned long data)
1904 {
1905         unsigned long flags;
1906
1907         if (!initialising)
1908                 show_floppy();
1909         cancel_activity();
1910
1911         floppy_enable_hlt();
1912
1913         flags = claim_dma_lock();
1914         fd_disable_dma();
1915         release_dma_lock(flags);
1916
1917         /* avoid dma going to a random drive after shutdown */
1918
1919         if (!initialising)
1920                 DPRINT("floppy timeout called\n");
1921         FDCS->reset = 1;
1922         if (cont) {
1923                 cont->done(0);
1924                 cont->redo();   /* this will recall reset when needed */
1925         } else {
1926                 printk("no cont in shutdown!\n");
1927                 process_fd_request();
1928         }
1929         is_alive("floppy shutdown");
1930 }
1931
1932 /* start motor, check media-changed condition and write protection */
1933 static int start_motor(void (*function)(void))
1934 {
1935         int mask;
1936         int data;
1937
1938         mask = 0xfc;
1939         data = UNIT(current_drive);
1940         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1941                 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1942                         set_debugt();
1943                         /* no read since this drive is running */
1944                         DRS->first_read_date = 0;
1945                         /* note motor start time if motor is not yet running */
1946                         DRS->spinup_date = jiffies;
1947                         data |= (0x10 << UNIT(current_drive));
1948                 }
1949         } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1950                 mask &= ~(0x10 << UNIT(current_drive));
1951
1952         /* starts motor and selects floppy */
1953         del_timer(motor_off_timer + current_drive);
1954         set_dor(fdc, mask, data);
1955
1956         /* wait_for_completion also schedules reset if needed. */
1957         return (fd_wait_for_completion(DRS->select_date + DP->select_delay,
1958                                        (timeout_fn) function));
1959 }
1960
1961 static void floppy_ready(void)
1962 {
1963         CHECK_RESET;
1964         if (start_motor(floppy_ready))
1965                 return;
1966         if (fdc_dtr())
1967                 return;
1968
1969 #ifdef DCL_DEBUG
1970         if (DP->flags & FD_DEBUG) {
1971                 DPRINT("calling disk change from floppy_ready\n");
1972         }
1973 #endif
1974         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1975             disk_change(current_drive) && !DP->select_delay)
1976                 twaddle();      /* this clears the dcl on certain drive/controller
1977                                  * combinations */
1978
1979 #ifdef fd_chose_dma_mode
1980         if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1981                 unsigned long flags = claim_dma_lock();
1982                 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1983                 release_dma_lock(flags);
1984         }
1985 #endif
1986
1987         if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1988                 perpendicular_mode();
1989                 fdc_specify();  /* must be done here because of hut, hlt ... */
1990                 seek_floppy();
1991         } else {
1992                 if ((raw_cmd->flags & FD_RAW_READ) ||
1993                     (raw_cmd->flags & FD_RAW_WRITE))
1994                         fdc_specify();
1995                 setup_rw_floppy();
1996         }
1997 }
1998
1999 static void floppy_start(void)
2000 {
2001         reschedule_timeout(current_reqD, "floppy start", 0);
2002
2003         scandrives();
2004 #ifdef DCL_DEBUG
2005         if (DP->flags & FD_DEBUG) {
2006                 DPRINT("setting NEWCHANGE in floppy_start\n");
2007         }
2008 #endif
2009         SETF(FD_DISK_NEWCHANGE);
2010         floppy_ready();
2011 }
2012
2013 /*
2014  * ========================================================================
2015  * here ends the bottom half. Exported routines are:
2016  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
2017  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
2018  * Initialization also uses output_byte, result, set_dor, floppy_interrupt
2019  * and set_dor.
2020  * ========================================================================
2021  */
2022 /*
2023  * General purpose continuations.
2024  * ==============================
2025  */
2026
2027 static void do_wakeup(void)
2028 {
2029         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
2030         cont = NULL;
2031         command_status += 2;
2032         wake_up(&command_done);
2033 }
2034
2035 static struct cont_t wakeup_cont = {
2036         .interrupt      = empty,
2037         .redo           = do_wakeup,
2038         .error          = empty,
2039         .done           = (done_f)empty
2040 };
2041
2042 static struct cont_t intr_cont = {
2043         .interrupt      = empty,
2044         .redo           = process_fd_request,
2045         .error          = empty,
2046         .done           = (done_f)empty
2047 };
2048
2049 static int wait_til_done(void (*handler)(void), int interruptible)
2050 {
2051         int ret;
2052
2053         schedule_bh(handler);
2054
2055         if (command_status < 2 && NO_SIGNAL) {
2056                 DECLARE_WAITQUEUE(wait, current);
2057
2058                 add_wait_queue(&command_done, &wait);
2059                 for (;;) {
2060                         set_current_state(interruptible ?
2061                                           TASK_INTERRUPTIBLE :
2062                                           TASK_UNINTERRUPTIBLE);
2063
2064                         if (command_status >= 2 || !NO_SIGNAL)
2065                                 break;
2066
2067                         is_alive("wait_til_done");
2068                         schedule();
2069                 }
2070
2071                 set_current_state(TASK_RUNNING);
2072                 remove_wait_queue(&command_done, &wait);
2073         }
2074
2075         if (command_status < 2) {
2076                 cancel_activity();
2077                 cont = &intr_cont;
2078                 reset_fdc();
2079                 return -EINTR;
2080         }
2081
2082         if (FDCS->reset)
2083                 command_status = FD_COMMAND_ERROR;
2084         if (command_status == FD_COMMAND_OKAY)
2085                 ret = 0;
2086         else
2087                 ret = -EIO;
2088         command_status = FD_COMMAND_NONE;
2089         return ret;
2090 }
2091
2092 static void generic_done(int result)
2093 {
2094         command_status = result;
2095         cont = &wakeup_cont;
2096 }
2097
2098 static void generic_success(void)
2099 {
2100         cont->done(1);
2101 }
2102
2103 static void generic_failure(void)
2104 {
2105         cont->done(0);
2106 }
2107
2108 static void success_and_wakeup(void)
2109 {
2110         generic_success();
2111         cont->redo();
2112 }
2113
2114 /*
2115  * formatting and rw support.
2116  * ==========================
2117  */
2118
2119 static int next_valid_format(void)
2120 {
2121         int probed_format;
2122
2123         probed_format = DRS->probed_format;
2124         while (1) {
2125                 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2126                         DRS->probed_format = 0;
2127                         return 1;
2128                 }
2129                 if (floppy_type[DP->autodetect[probed_format]].sect) {
2130                         DRS->probed_format = probed_format;
2131                         return 0;
2132                 }
2133                 probed_format++;
2134         }
2135 }
2136
2137 static void bad_flp_intr(void)
2138 {
2139         int err_count;
2140
2141         if (probing) {
2142                 DRS->probed_format++;
2143                 if (!next_valid_format())
2144                         return;
2145         }
2146         err_count = ++(*errors);
2147         INFBOUND(DRWE->badness, err_count);
2148         if (err_count > DP->max_errors.abort)
2149                 cont->done(0);
2150         if (err_count > DP->max_errors.reset)
2151                 FDCS->reset = 1;
2152         else if (err_count > DP->max_errors.recal)
2153                 DRS->track = NEED_2_RECAL;
2154 }
2155
2156 static void set_floppy(int drive)
2157 {
2158         int type = ITYPE(UDRS->fd_device);
2159
2160         if (type)
2161                 _floppy = floppy_type + type;
2162         else
2163                 _floppy = current_type[drive];
2164 }
2165
2166 /*
2167  * formatting support.
2168  * ===================
2169  */
2170 static void format_interrupt(void)
2171 {
2172         switch (interpret_errors()) {
2173         case 1:
2174                 cont->error();
2175         case 2:
2176                 break;
2177         case 0:
2178                 cont->done(1);
2179         }
2180         cont->redo();
2181 }
2182
2183 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
2184 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
2185 #define CT(x) ((x) | 0xc0)
2186 static void setup_format_params(int track)
2187 {
2188         int n;
2189         int il;
2190         int count;
2191         int head_shift;
2192         int track_shift;
2193         struct fparm {
2194                 unsigned char track, head, sect, size;
2195         } *here = (struct fparm *)floppy_track_buffer;
2196
2197         raw_cmd = &default_raw_cmd;
2198         raw_cmd->track = track;
2199
2200         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2201             FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2202         raw_cmd->rate = _floppy->rate & 0x43;
2203         raw_cmd->cmd_count = NR_F;
2204         COMMAND = FM_MODE(_floppy, FD_FORMAT);
2205         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2206         F_SIZECODE = FD_SIZECODE(_floppy);
2207         F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2208         F_GAP = _floppy->fmt_gap;
2209         F_FILL = FD_FILL_BYTE;
2210
2211         raw_cmd->kernel_data = floppy_track_buffer;
2212         raw_cmd->length = 4 * F_SECT_PER_TRACK;
2213
2214         /* allow for about 30ms for data transport per track */
2215         head_shift = (F_SECT_PER_TRACK + 5) / 6;
2216
2217         /* a ``cylinder'' is two tracks plus a little stepping time */
2218         track_shift = 2 * head_shift + 3;
2219
2220         /* position of logical sector 1 on this track */
2221         n = (track_shift * format_req.track + head_shift * format_req.head)
2222             % F_SECT_PER_TRACK;
2223
2224         /* determine interleave */
2225         il = 1;
2226         if (_floppy->fmt_gap < 0x22)
2227                 il++;
2228
2229         /* initialize field */
2230         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2231                 here[count].track = format_req.track;
2232                 here[count].head = format_req.head;
2233                 here[count].sect = 0;
2234                 here[count].size = F_SIZECODE;
2235         }
2236         /* place logical sectors */
2237         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2238                 here[n].sect = count;
2239                 n = (n + il) % F_SECT_PER_TRACK;
2240                 if (here[n].sect) {     /* sector busy, find next free sector */
2241                         ++n;
2242                         if (n >= F_SECT_PER_TRACK) {
2243                                 n -= F_SECT_PER_TRACK;
2244                                 while (here[n].sect)
2245                                         ++n;
2246                         }
2247                 }
2248         }
2249         if (_floppy->stretch & FD_SECTBASEMASK) {
2250                 for (count = 0; count < F_SECT_PER_TRACK; count++)
2251                         here[count].sect += FD_SECTBASE(_floppy) - 1;
2252         }
2253 }
2254
2255 static void redo_format(void)
2256 {
2257         buffer_track = -1;
2258         setup_format_params(format_req.track << STRETCH(_floppy));
2259         floppy_start();
2260         debugt("queue format request");
2261 }
2262
2263 static struct cont_t format_cont = {
2264         .interrupt      = format_interrupt,
2265         .redo           = redo_format,
2266         .error          = bad_flp_intr,
2267         .done           = generic_done
2268 };
2269
2270 static int do_format(int drive, struct format_descr *tmp_format_req)
2271 {
2272         int ret;
2273
2274         LOCK_FDC(drive, 1);
2275         set_floppy(drive);
2276         if (!_floppy ||
2277             _floppy->track > DP->tracks ||
2278             tmp_format_req->track >= _floppy->track ||
2279             tmp_format_req->head >= _floppy->head ||
2280             (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2281             !_floppy->fmt_gap) {
2282                 process_fd_request();
2283                 return -EINVAL;
2284         }
2285         format_req = *tmp_format_req;
2286         format_errors = 0;
2287         cont = &format_cont;
2288         errors = &format_errors;
2289         IWAIT(redo_format);
2290         process_fd_request();
2291         return ret;
2292 }
2293
2294 /*
2295  * Buffer read/write and support
2296  * =============================
2297  */
2298
2299 static void floppy_end_request(struct request *req, int error)
2300 {
2301         unsigned int nr_sectors = current_count_sectors;
2302         unsigned int drive = (unsigned long)req->rq_disk->private_data;
2303
2304         /* current_count_sectors can be zero if transfer failed */
2305         if (error)
2306                 nr_sectors = blk_rq_cur_sectors(req);
2307         if (__blk_end_request(req, error, nr_sectors << 9))
2308                 return;
2309
2310         /* We're done with the request */
2311         floppy_off(drive);
2312         current_req = NULL;
2313 }
2314
2315 /* new request_done. Can handle physical sectors which are smaller than a
2316  * logical buffer */
2317 static void request_done(int uptodate)
2318 {
2319         struct request_queue *q = floppy_queue;
2320         struct request *req = current_req;
2321         unsigned long flags;
2322         int block;
2323
2324         probing = 0;
2325         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2326
2327         if (!req) {
2328                 printk("floppy.c: no request in request_done\n");
2329                 return;
2330         }
2331
2332         if (uptodate) {
2333                 /* maintain values for invalidation on geometry
2334                  * change */
2335                 block = current_count_sectors + blk_rq_pos(req);
2336                 INFBOUND(DRS->maxblock, block);
2337                 if (block > _floppy->sect)
2338                         DRS->maxtrack = 1;
2339
2340                 /* unlock chained buffers */
2341                 spin_lock_irqsave(q->queue_lock, flags);
2342                 floppy_end_request(req, 0);
2343                 spin_unlock_irqrestore(q->queue_lock, flags);
2344         } else {
2345                 if (rq_data_dir(req) == WRITE) {
2346                         /* record write error information */
2347                         DRWE->write_errors++;
2348                         if (DRWE->write_errors == 1) {
2349                                 DRWE->first_error_sector = blk_rq_pos(req);
2350                                 DRWE->first_error_generation = DRS->generation;
2351                         }
2352                         DRWE->last_error_sector = blk_rq_pos(req);
2353                         DRWE->last_error_generation = DRS->generation;
2354                 }
2355                 spin_lock_irqsave(q->queue_lock, flags);
2356                 floppy_end_request(req, -EIO);
2357                 spin_unlock_irqrestore(q->queue_lock, flags);
2358         }
2359 }
2360
2361 /* Interrupt handler evaluating the result of the r/w operation */
2362 static void rw_interrupt(void)
2363 {
2364         int eoc;
2365         int ssize;
2366         int heads;
2367         int nr_sectors;
2368
2369         if (R_HEAD >= 2) {
2370                 /* some Toshiba floppy controllers occasionnally seem to
2371                  * return bogus interrupts after read/write operations, which
2372                  * can be recognized by a bad head number (>= 2) */
2373                 return;
2374         }
2375
2376         if (!DRS->first_read_date)
2377                 DRS->first_read_date = jiffies;
2378
2379         nr_sectors = 0;
2380         CODE2SIZE;
2381
2382         if (ST1 & ST1_EOC)
2383                 eoc = 1;
2384         else
2385                 eoc = 0;
2386
2387         if (COMMAND & 0x80)
2388                 heads = 2;
2389         else
2390                 heads = 1;
2391
2392         nr_sectors = (((R_TRACK - TRACK) * heads +
2393                        R_HEAD - HEAD) * SECT_PER_TRACK +
2394                       R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2395
2396 #ifdef FLOPPY_SANITY_CHECK
2397         if (nr_sectors / ssize >
2398             DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2399                 DPRINT("long rw: %x instead of %lx\n",
2400                        nr_sectors, current_count_sectors);
2401                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2402                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2403                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2404                 printk("heads=%d eoc=%d\n", heads, eoc);
2405                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2406                        fsector_t, ssize);
2407                 printk("in_sector_offset=%d\n", in_sector_offset);
2408         }
2409 #endif
2410
2411         nr_sectors -= in_sector_offset;
2412         INFBOUND(nr_sectors, 0);
2413         SUPBOUND(current_count_sectors, nr_sectors);
2414
2415         switch (interpret_errors()) {
2416         case 2:
2417                 cont->redo();
2418                 return;
2419         case 1:
2420                 if (!current_count_sectors) {
2421                         cont->error();
2422                         cont->redo();
2423                         return;
2424                 }
2425                 break;
2426         case 0:
2427                 if (!current_count_sectors) {
2428                         cont->redo();
2429                         return;
2430                 }
2431                 current_type[current_drive] = _floppy;
2432                 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2433                 break;
2434         }
2435
2436         if (probing) {
2437                 if (DP->flags & FTD_MSG)
2438                         DPRINT("Auto-detected floppy type %s in fd%d\n",
2439                                _floppy->name, current_drive);
2440                 current_type[current_drive] = _floppy;
2441                 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2442                 probing = 0;
2443         }
2444
2445         if (CT(COMMAND) != FD_READ ||
2446             raw_cmd->kernel_data == current_req->buffer) {
2447                 /* transfer directly from buffer */
2448                 cont->done(1);
2449         } else if (CT(COMMAND) == FD_READ) {
2450                 buffer_track = raw_cmd->track;
2451                 buffer_drive = current_drive;
2452                 INFBOUND(buffer_max, nr_sectors + fsector_t);
2453         }
2454         cont->redo();
2455 }
2456
2457 /* Compute maximal contiguous buffer size. */
2458 static int buffer_chain_size(void)
2459 {
2460         struct bio_vec *bv;
2461         int size;
2462         struct req_iterator iter;
2463         char *base;
2464
2465         base = bio_data(current_req->bio);
2466         size = 0;
2467
2468         rq_for_each_segment(bv, current_req, iter) {
2469                 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2470                         break;
2471
2472                 size += bv->bv_len;
2473         }
2474
2475         return size >> 9;
2476 }
2477
2478 /* Compute the maximal transfer size */
2479 static int transfer_size(int ssize, int max_sector, int max_size)
2480 {
2481         SUPBOUND(max_sector, fsector_t + max_size);
2482
2483         /* alignment */
2484         max_sector -= (max_sector % _floppy->sect) % ssize;
2485
2486         /* transfer size, beginning not aligned */
2487         current_count_sectors = max_sector - fsector_t;
2488
2489         return max_sector;
2490 }
2491
2492 /*
2493  * Move data from/to the track buffer to/from the buffer cache.
2494  */
2495 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2496 {
2497         int remaining;          /* number of transferred 512-byte sectors */
2498         struct bio_vec *bv;
2499         char *buffer;
2500         char *dma_buffer;
2501         int size;
2502         struct req_iterator iter;
2503
2504         max_sector = transfer_size(ssize,
2505                                    min(max_sector, max_sector_2),
2506                                    blk_rq_sectors(current_req));
2507
2508         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2509             buffer_max > fsector_t + blk_rq_sectors(current_req))
2510                 current_count_sectors = min_t(int, buffer_max - fsector_t,
2511                                               blk_rq_sectors(current_req));
2512
2513         remaining = current_count_sectors << 9;
2514 #ifdef FLOPPY_SANITY_CHECK
2515         if ((remaining >> 9) > blk_rq_sectors(current_req) &&
2516             CT(COMMAND) == FD_WRITE) {
2517                 DPRINT("in copy buffer\n");
2518                 printk("current_count_sectors=%ld\n", current_count_sectors);
2519                 printk("remaining=%d\n", remaining >> 9);
2520                 printk("current_req->nr_sectors=%u\n",
2521                        blk_rq_sectors(current_req));
2522                 printk("current_req->current_nr_sectors=%u\n",
2523                        blk_rq_cur_sectors(current_req));
2524                 printk("max_sector=%d\n", max_sector);
2525                 printk("ssize=%d\n", ssize);
2526         }
2527 #endif
2528
2529         buffer_max = max(max_sector, buffer_max);
2530
2531         dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2532
2533         size = blk_rq_cur_sectors(current_req) << 9;
2534
2535         rq_for_each_segment(bv, current_req, iter) {
2536                 if (!remaining)
2537                         break;
2538
2539                 size = bv->bv_len;
2540                 SUPBOUND(size, remaining);
2541
2542                 buffer = page_address(bv->bv_page) + bv->bv_offset;
2543 #ifdef FLOPPY_SANITY_CHECK
2544                 if (dma_buffer + size >
2545                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2546                     dma_buffer < floppy_track_buffer) {
2547                         DPRINT("buffer overrun in copy buffer %d\n",
2548                                (int)((floppy_track_buffer -
2549                                       dma_buffer) >> 9));
2550                         printk("fsector_t=%d buffer_min=%d\n",
2551                                fsector_t, buffer_min);
2552                         printk("current_count_sectors=%ld\n",
2553                                current_count_sectors);
2554                         if (CT(COMMAND) == FD_READ)
2555                                 printk("read\n");
2556                         if (CT(COMMAND) == FD_WRITE)
2557                                 printk("write\n");
2558                         break;
2559                 }
2560                 if (((unsigned long)buffer) % 512)
2561                         DPRINT("%p buffer not aligned\n", buffer);
2562 #endif
2563                 if (CT(COMMAND) == FD_READ)
2564                         memcpy(buffer, dma_buffer, size);
2565                 else
2566                         memcpy(dma_buffer, buffer, size);
2567
2568                 remaining -= size;
2569                 dma_buffer += size;
2570         }
2571 #ifdef FLOPPY_SANITY_CHECK
2572         if (remaining) {
2573                 if (remaining > 0)
2574                         max_sector -= remaining >> 9;
2575                 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2576         }
2577 #endif
2578 }
2579
2580 /* work around a bug in pseudo DMA
2581  * (on some FDCs) pseudo DMA does not stop when the CPU stops
2582  * sending data.  Hence we need a different way to signal the
2583  * transfer length:  We use SECT_PER_TRACK.  Unfortunately, this
2584  * does not work with MT, hence we can only transfer one head at
2585  * a time
2586  */
2587 static void virtualdmabug_workaround(void)
2588 {
2589         int hard_sectors;
2590         int end_sector;
2591
2592         if (CT(COMMAND) == FD_WRITE) {
2593                 COMMAND &= ~0x80;       /* switch off multiple track mode */
2594
2595                 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2596                 end_sector = SECTOR + hard_sectors - 1;
2597 #ifdef FLOPPY_SANITY_CHECK
2598                 if (end_sector > SECT_PER_TRACK) {
2599                         printk("too many sectors %d > %d\n",
2600                                end_sector, SECT_PER_TRACK);
2601                         return;
2602                 }
2603 #endif
2604                 SECT_PER_TRACK = end_sector;    /* make sure SECT_PER_TRACK points
2605                                                  * to end of transfer */
2606         }
2607 }
2608
2609 /*
2610  * Formulate a read/write request.
2611  * this routine decides where to load the data (directly to buffer, or to
2612  * tmp floppy area), how much data to load (the size of the buffer, the whole
2613  * track, or a single sector)
2614  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2615  * allocation on the fly, it should be done here. No other part should need
2616  * modification.
2617  */
2618
2619 static int make_raw_rw_request(void)
2620 {
2621         int aligned_sector_t;
2622         int max_sector;
2623         int max_size;
2624         int tracksize;
2625         int ssize;
2626
2627         if (max_buffer_sectors == 0) {
2628                 printk("VFS: Block I/O scheduled on unopened device\n");
2629                 return 0;
2630         }
2631
2632         set_fdc((long)current_req->rq_disk->private_data);
2633
2634         raw_cmd = &default_raw_cmd;
2635         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2636             FD_RAW_NEED_SEEK;
2637         raw_cmd->cmd_count = NR_RW;
2638         if (rq_data_dir(current_req) == READ) {
2639                 raw_cmd->flags |= FD_RAW_READ;
2640                 COMMAND = FM_MODE(_floppy, FD_READ);
2641         } else if (rq_data_dir(current_req) == WRITE) {
2642                 raw_cmd->flags |= FD_RAW_WRITE;
2643                 COMMAND = FM_MODE(_floppy, FD_WRITE);
2644         } else {
2645                 DPRINT("make_raw_rw_request: unknown command\n");
2646                 return 0;
2647         }
2648
2649         max_sector = _floppy->sect * _floppy->head;
2650
2651         TRACK = (int)blk_rq_pos(current_req) / max_sector;
2652         fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2653         if (_floppy->track && TRACK >= _floppy->track) {
2654                 if (blk_rq_cur_sectors(current_req) & 1) {
2655                         current_count_sectors = 1;
2656                         return 1;
2657                 } else
2658                         return 0;
2659         }
2660         HEAD = fsector_t / _floppy->sect;
2661
2662         if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2663              TESTF(FD_NEED_TWADDLE)) && fsector_t < _floppy->sect)
2664                 max_sector = _floppy->sect;
2665
2666         /* 2M disks have phantom sectors on the first track */
2667         if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2668                 max_sector = 2 * _floppy->sect / 3;
2669                 if (fsector_t >= max_sector) {
2670                         current_count_sectors =
2671                             min_t(int, _floppy->sect - fsector_t,
2672                                   blk_rq_sectors(current_req));
2673                         return 1;
2674                 }
2675                 SIZECODE = 2;
2676         } else
2677                 SIZECODE = FD_SIZECODE(_floppy);
2678         raw_cmd->rate = _floppy->rate & 0x43;
2679         if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2680                 raw_cmd->rate = 1;
2681
2682         if (SIZECODE)
2683                 SIZECODE2 = 0xff;
2684         else
2685                 SIZECODE2 = 0x80;
2686         raw_cmd->track = TRACK << STRETCH(_floppy);
2687         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2688         GAP = _floppy->gap;
2689         CODE2SIZE;
2690         SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2691         SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2692             FD_SECTBASE(_floppy);
2693
2694         /* tracksize describes the size which can be filled up with sectors
2695          * of size ssize.
2696          */
2697         tracksize = _floppy->sect - _floppy->sect % ssize;
2698         if (tracksize < _floppy->sect) {
2699                 SECT_PER_TRACK++;
2700                 if (tracksize <= fsector_t % _floppy->sect)
2701                         SECTOR--;
2702
2703                 /* if we are beyond tracksize, fill up using smaller sectors */
2704                 while (tracksize <= fsector_t % _floppy->sect) {
2705                         while (tracksize + ssize > _floppy->sect) {
2706                                 SIZECODE--;
2707                                 ssize >>= 1;
2708                         }
2709                         SECTOR++;
2710                         SECT_PER_TRACK++;
2711                         tracksize += ssize;
2712                 }
2713                 max_sector = HEAD * _floppy->sect + tracksize;
2714         } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2715                 max_sector = _floppy->sect;
2716         } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2717                 /* for virtual DMA bug workaround */
2718                 max_sector = _floppy->sect;
2719         }
2720
2721         in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2722         aligned_sector_t = fsector_t - in_sector_offset;
2723         max_size = blk_rq_sectors(current_req);
2724         if ((raw_cmd->track == buffer_track) &&
2725             (current_drive == buffer_drive) &&
2726             (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2727                 /* data already in track buffer */
2728                 if (CT(COMMAND) == FD_READ) {
2729                         copy_buffer(1, max_sector, buffer_max);
2730                         return 1;
2731                 }
2732         } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2733                 if (CT(COMMAND) == FD_WRITE) {
2734                         if (fsector_t + blk_rq_sectors(current_req) > ssize &&
2735                             fsector_t + blk_rq_sectors(current_req) < ssize + ssize)
2736                                 max_size = ssize + ssize;
2737                         else
2738                                 max_size = ssize;
2739                 }
2740                 raw_cmd->flags &= ~FD_RAW_WRITE;
2741                 raw_cmd->flags |= FD_RAW_READ;
2742                 COMMAND = FM_MODE(_floppy, FD_READ);
2743         } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2744                 unsigned long dma_limit;
2745                 int direct, indirect;
2746
2747                 indirect =
2748                     transfer_size(ssize, max_sector,
2749                                   max_buffer_sectors * 2) - fsector_t;
2750
2751                 /*
2752                  * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2753                  * on a 64 bit machine!
2754                  */
2755                 max_size = buffer_chain_size();
2756                 dma_limit =
2757                     (MAX_DMA_ADDRESS -
2758                      ((unsigned long)current_req->buffer)) >> 9;
2759                 if ((unsigned long)max_size > dma_limit) {
2760                         max_size = dma_limit;
2761                 }
2762                 /* 64 kb boundaries */
2763                 if (CROSS_64KB(current_req->buffer, max_size << 9))
2764                         max_size = (K_64 -
2765                                     ((unsigned long)current_req->buffer) %
2766                                     K_64) >> 9;
2767                 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2768                 /*
2769                  * We try to read tracks, but if we get too many errors, we
2770                  * go back to reading just one sector at a time.
2771                  *
2772                  * This means we should be able to read a sector even if there
2773                  * are other bad sectors on this track.
2774                  */
2775                 if (!direct ||
2776                     (indirect * 2 > direct * 3 &&
2777                      *errors < DP->max_errors.read_track && ((!probing
2778                        || (DP->read_track & (1 << DRS->probed_format)))))) {
2779                         max_size = blk_rq_sectors(current_req);
2780                 } else {
2781                         raw_cmd->kernel_data = current_req->buffer;
2782                         raw_cmd->length = current_count_sectors << 9;
2783                         if (raw_cmd->length == 0) {
2784                                 DPRINT
2785                                     ("zero dma transfer attempted from make_raw_request\n");
2786                                 DPRINT("indirect=%d direct=%d fsector_t=%d",
2787                                        indirect, direct, fsector_t);
2788                                 return 0;
2789                         }
2790                         virtualdmabug_workaround();
2791                         return 2;
2792                 }
2793         }
2794
2795         if (CT(COMMAND) == FD_READ)
2796                 max_size = max_sector;  /* unbounded */
2797
2798         /* claim buffer track if needed */
2799         if (buffer_track != raw_cmd->track ||   /* bad track */
2800             buffer_drive != current_drive ||    /* bad drive */
2801             fsector_t > buffer_max ||
2802             fsector_t < buffer_min ||
2803             ((CT(COMMAND) == FD_READ ||
2804               (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2805              max_sector > 2 * max_buffer_sectors + buffer_min &&
2806              max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)
2807             /* not enough space */
2808             ) {
2809                 buffer_track = -1;
2810                 buffer_drive = current_drive;
2811                 buffer_max = buffer_min = aligned_sector_t;
2812         }
2813         raw_cmd->kernel_data = floppy_track_buffer +
2814             ((aligned_sector_t - buffer_min) << 9);
2815
2816         if (CT(COMMAND) == FD_WRITE) {
2817                 /* copy write buffer to track buffer.
2818                  * if we get here, we know that the write
2819                  * is either aligned or the data already in the buffer
2820                  * (buffer will be overwritten) */
2821 #ifdef FLOPPY_SANITY_CHECK
2822                 if (in_sector_offset && buffer_track == -1)
2823                         DPRINT("internal error offset !=0 on write\n");
2824 #endif
2825                 buffer_track = raw_cmd->track;
2826                 buffer_drive = current_drive;
2827                 copy_buffer(ssize, max_sector,
2828                             2 * max_buffer_sectors + buffer_min);
2829         } else
2830                 transfer_size(ssize, max_sector,
2831                               2 * max_buffer_sectors + buffer_min -
2832                               aligned_sector_t);
2833
2834         /* round up current_count_sectors to get dma xfer size */
2835         raw_cmd->length = in_sector_offset + current_count_sectors;
2836         raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2837         raw_cmd->length <<= 9;
2838 #ifdef FLOPPY_SANITY_CHECK
2839         if ((raw_cmd->length < current_count_sectors << 9) ||
2840             (raw_cmd->kernel_data != current_req->buffer &&
2841              CT(COMMAND) == FD_WRITE &&
2842              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2843               aligned_sector_t < buffer_min)) ||
2844             raw_cmd->length % (128 << SIZECODE) ||
2845             raw_cmd->length <= 0 || current_count_sectors <= 0) {
2846                 DPRINT("fractionary current count b=%lx s=%lx\n",
2847                        raw_cmd->length, current_count_sectors);
2848                 if (raw_cmd->kernel_data != current_req->buffer)
2849                         printk("addr=%d, length=%ld\n",
2850                                (int)((raw_cmd->kernel_data -
2851                                       floppy_track_buffer) >> 9),
2852                                current_count_sectors);
2853                 printk("st=%d ast=%d mse=%d msi=%d\n",
2854                        fsector_t, aligned_sector_t, max_sector, max_size);
2855                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2856                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2857                        COMMAND, SECTOR, HEAD, TRACK);
2858                 printk("buffer drive=%d\n", buffer_drive);
2859                 printk("buffer track=%d\n", buffer_track);
2860                 printk("buffer_min=%d\n", buffer_min);
2861                 printk("buffer_max=%d\n", buffer_max);
2862                 return 0;
2863         }
2864
2865         if (raw_cmd->kernel_data != current_req->buffer) {
2866                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2867                     current_count_sectors < 0 ||
2868                     raw_cmd->length < 0 ||
2869                     raw_cmd->kernel_data + raw_cmd->length >
2870                     floppy_track_buffer + (max_buffer_sectors << 10)) {
2871                         DPRINT("buffer overrun in schedule dma\n");
2872                         printk("fsector_t=%d buffer_min=%d current_count=%ld\n",
2873                                fsector_t, buffer_min, raw_cmd->length >> 9);
2874                         printk("current_count_sectors=%ld\n",
2875                                current_count_sectors);
2876                         if (CT(COMMAND) == FD_READ)
2877                                 printk("read\n");
2878                         if (CT(COMMAND) == FD_WRITE)
2879                                 printk("write\n");
2880                         return 0;
2881                 }
2882         } else if (raw_cmd->length > blk_rq_sectors(current_req) << 9 ||
2883                    current_count_sectors > blk_rq_sectors(current_req)) {
2884                 DPRINT("buffer overrun in direct transfer\n");
2885                 return 0;
2886         } else if (raw_cmd->length < current_count_sectors << 9) {
2887                 DPRINT("more sectors than bytes\n");
2888                 printk("bytes=%ld\n", raw_cmd->length >> 9);
2889                 printk("sectors=%ld\n", current_count_sectors);
2890         }
2891         if (raw_cmd->length == 0) {
2892                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2893                 return 0;
2894         }
2895 #endif
2896
2897         virtualdmabug_workaround();
2898         return 2;
2899 }
2900
2901 static void redo_fd_request(void)
2902 {
2903 #define REPEAT {request_done(0); continue; }
2904         int drive;
2905         int tmp;
2906
2907         lastredo = jiffies;
2908         if (current_drive < N_DRIVE)
2909                 floppy_off(current_drive);
2910
2911         for (;;) {
2912                 if (!current_req) {
2913                         struct request *req;
2914
2915                         spin_lock_irq(floppy_queue->queue_lock);
2916                         req = elv_next_request(floppy_queue);
2917                         spin_unlock_irq(floppy_queue->queue_lock);
2918                         if (!req) {
2919                                 do_floppy = NULL;
2920                                 unlock_fdc();
2921                                 return;
2922                         }
2923                         current_req = req;
2924                 }
2925                 drive = (long)current_req->rq_disk->private_data;
2926                 set_fdc(drive);
2927                 reschedule_timeout(current_reqD, "redo fd request", 0);
2928
2929                 set_floppy(drive);
2930                 raw_cmd = &default_raw_cmd;
2931                 raw_cmd->flags = 0;
2932                 if (start_motor(redo_fd_request))
2933                         return;
2934                 disk_change(current_drive);
2935                 if (test_bit(current_drive, &fake_change) ||
2936                     TESTF(FD_DISK_CHANGED)) {
2937                         DPRINT("disk absent or changed during operation\n");
2938                         REPEAT;
2939                 }
2940                 if (!_floppy) { /* Autodetection */
2941                         if (!probing) {
2942                                 DRS->probed_format = 0;
2943                                 if (next_valid_format()) {
2944                                         DPRINT("no autodetectable formats\n");
2945                                         _floppy = NULL;
2946                                         REPEAT;
2947                                 }
2948                         }
2949                         probing = 1;
2950                         _floppy =
2951                             floppy_type + DP->autodetect[DRS->probed_format];
2952                 } else
2953                         probing = 0;
2954                 errors = &(current_req->errors);
2955                 tmp = make_raw_rw_request();
2956                 if (tmp < 2) {
2957                         request_done(tmp);
2958                         continue;
2959                 }
2960
2961                 if (TESTF(FD_NEED_TWADDLE))
2962                         twaddle();
2963                 schedule_bh(floppy_start);
2964                 debugt("queue fd request");
2965                 return;
2966         }
2967 #undef REPEAT
2968 }
2969
2970 static struct cont_t rw_cont = {
2971         .interrupt      = rw_interrupt,
2972         .redo           = redo_fd_request,
2973         .error          = bad_flp_intr,
2974         .done           = request_done
2975 };
2976
2977 static void process_fd_request(void)
2978 {
2979         cont = &rw_cont;
2980         schedule_bh(redo_fd_request);
2981 }
2982
2983 static void do_fd_request(struct request_queue * q)
2984 {
2985         if (max_buffer_sectors == 0) {
2986                 printk("VFS: do_fd_request called on non-open device\n");
2987                 return;
2988         }
2989
2990         if (usage_count == 0) {
2991                 printk("warning: usage count=0, current_req=%p exiting\n",
2992                        current_req);
2993                 printk("sect=%ld type=%x flags=%x\n",
2994                        (long)blk_rq_pos(current_req), current_req->cmd_type,
2995                        current_req->cmd_flags);
2996                 return;
2997         }
2998         if (test_bit(0, &fdc_busy)) {
2999                 /* fdc busy, this new request will be treated when the
3000                    current one is done */
3001                 is_alive("do fd request, old request running");
3002                 return;
3003         }
3004         lock_fdc(MAXTIMEOUT, 0);
3005         process_fd_request();
3006         is_alive("do fd request");
3007 }
3008
3009 static struct cont_t poll_cont = {
3010         .interrupt      = success_and_wakeup,
3011         .redo           = floppy_ready,
3012         .error          = generic_failure,
3013         .done           = generic_done
3014 };
3015
3016 static int poll_drive(int interruptible, int flag)
3017 {
3018         int ret;
3019
3020         /* no auto-sense, just clear dcl */
3021         raw_cmd = &default_raw_cmd;
3022         raw_cmd->flags = flag;
3023         raw_cmd->track = 0;
3024         raw_cmd->cmd_count = 0;
3025         cont = &poll_cont;
3026 #ifdef DCL_DEBUG
3027         if (DP->flags & FD_DEBUG) {
3028                 DPRINT("setting NEWCHANGE in poll_drive\n");
3029         }
3030 #endif
3031         SETF(FD_DISK_NEWCHANGE);
3032         WAIT(floppy_ready);
3033         return ret;
3034 }
3035
3036 /*
3037  * User triggered reset
3038  * ====================
3039  */
3040
3041 static void reset_intr(void)
3042 {
3043         printk("weird, reset interrupt called\n");
3044 }
3045
3046 static struct cont_t reset_cont = {
3047         .interrupt      = reset_intr,
3048         .redo           = success_and_wakeup,
3049         .error          = generic_failure,
3050         .done           = generic_done
3051 };
3052
3053 static int user_reset_fdc(int drive, int arg, int interruptible)
3054 {
3055         int ret;
3056
3057         ret = 0;
3058         LOCK_FDC(drive, interruptible);
3059         if (arg == FD_RESET_ALWAYS)
3060                 FDCS->reset = 1;
3061         if (FDCS->reset) {
3062                 cont = &reset_cont;
3063                 WAIT(reset_fdc);
3064         }
3065         process_fd_request();
3066         return ret;
3067 }
3068
3069 /*
3070  * Misc Ioctl's and support
3071  * ========================
3072  */
3073 static inline int fd_copyout(void __user *param, const void *address,
3074                              unsigned long size)
3075 {
3076         return copy_to_user(param, address, size) ? -EFAULT : 0;
3077 }
3078
3079 static inline int fd_copyin(void __user *param, void *address, unsigned long size)
3080 {
3081         return copy_from_user(address, param, size) ? -EFAULT : 0;
3082 }
3083
3084 #define _COPYOUT(x) (copy_to_user((void __user *)param, &(x), sizeof(x)) ? -EFAULT : 0)
3085 #define _COPYIN(x) (copy_from_user(&(x), (void __user *)param, sizeof(x)) ? -EFAULT : 0)
3086
3087 #define COPYOUT(x) ECALL(_COPYOUT(x))
3088 #define COPYIN(x) ECALL(_COPYIN(x))
3089
3090 static inline const char *drive_name(int type, int drive)
3091 {
3092         struct floppy_struct *floppy;
3093
3094         if (type)
3095                 floppy = floppy_type + type;
3096         else {
3097                 if (UDP->native_format)
3098                         floppy = floppy_type + UDP->native_format;
3099                 else
3100                         return "(null)";
3101         }
3102         if (floppy->name)
3103                 return floppy->name;
3104         else
3105                 return "(null)";
3106 }
3107
3108 /* raw commands */
3109 static void raw_cmd_done(int flag)
3110 {
3111         int i;
3112
3113         if (!flag) {
3114                 raw_cmd->flags |= FD_RAW_FAILURE;
3115                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3116         } else {
3117                 raw_cmd->reply_count = inr;
3118                 if (raw_cmd->reply_count > MAX_REPLIES)
3119                         raw_cmd->reply_count = 0;
3120                 for (i = 0; i < raw_cmd->reply_count; i++)
3121                         raw_cmd->reply[i] = reply_buffer[i];
3122
3123                 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3124                         unsigned long flags;
3125                         flags = claim_dma_lock();
3126                         raw_cmd->length = fd_get_dma_residue();
3127                         release_dma_lock(flags);
3128                 }
3129
3130                 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3131                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3132                         raw_cmd->flags |= FD_RAW_FAILURE;
3133
3134                 if (disk_change(current_drive))
3135                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3136                 else
3137                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3138                 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3139                         motor_off_callback(current_drive);
3140
3141                 if (raw_cmd->next &&
3142                     (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3143                      !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3144                     ((raw_cmd->flags & FD_RAW_FAILURE) ||
3145                      !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3146                         raw_cmd = raw_cmd->next;
3147                         return;
3148                 }
3149         }
3150         generic_done(flag);
3151 }
3152
3153 static struct cont_t raw_cmd_cont = {
3154         .interrupt      = success_and_wakeup,
3155         .redo           = floppy_start,
3156         .error          = generic_failure,
3157         .done           = raw_cmd_done
3158 };
3159
3160 static inline int raw_cmd_copyout(int cmd, char __user *param,
3161                                   struct floppy_raw_cmd *ptr)
3162 {
3163         int ret;
3164
3165         while (ptr) {
3166                 COPYOUT(*ptr);
3167                 param += sizeof(struct floppy_raw_cmd);
3168                 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3169                         if (ptr->length >= 0
3170                             && ptr->length <= ptr->buffer_length)
3171                                 ECALL(fd_copyout
3172                                       (ptr->data, ptr->kernel_data,
3173                                        ptr->buffer_length - ptr->length));
3174                 }
3175                 ptr = ptr->next;
3176         }
3177         return 0;
3178 }
3179
3180 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3181 {
3182         struct floppy_raw_cmd *next;
3183         struct floppy_raw_cmd *this;
3184
3185         this = *ptr;
3186         *ptr = NULL;
3187         while (this) {
3188                 if (this->buffer_length) {
3189                         fd_dma_mem_free((unsigned long)this->kernel_data,
3190                                         this->buffer_length);
3191                         this->buffer_length = 0;
3192                 }
3193                 next = this->next;
3194                 kfree(this);
3195                 this = next;
3196         }
3197 }
3198
3199 static inline int raw_cmd_copyin(int cmd, char __user *param,
3200                                  struct floppy_raw_cmd **rcmd)
3201 {
3202         struct floppy_raw_cmd *ptr;
3203         int ret;
3204         int i;
3205
3206         *rcmd = NULL;
3207         while (1) {
3208                 ptr = (struct floppy_raw_cmd *)
3209                     kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3210                 if (!ptr)
3211                         return -ENOMEM;
3212                 *rcmd = ptr;
3213                 COPYIN(*ptr);
3214                 ptr->next = NULL;
3215                 ptr->buffer_length = 0;
3216                 param += sizeof(struct floppy_raw_cmd);
3217                 if (ptr->cmd_count > 33)
3218                         /* the command may now also take up the space
3219                          * initially intended for the reply & the
3220                          * reply count. Needed for long 82078 commands
3221                          * such as RESTORE, which takes ... 17 command
3222                          * bytes. Murphy's law #137: When you reserve
3223                          * 16 bytes for a structure, you'll one day
3224                          * discover that you really need 17...
3225                          */
3226                         return -EINVAL;
3227
3228                 for (i = 0; i < 16; i++)
3229                         ptr->reply[i] = 0;
3230                 ptr->resultcode = 0;
3231                 ptr->kernel_data = NULL;
3232
3233                 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3234                         if (ptr->length <= 0)
3235                                 return -EINVAL;
3236                         ptr->kernel_data =
3237                             (char *)fd_dma_mem_alloc(ptr->length);
3238                         fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3239                         if (!ptr->kernel_data)
3240                                 return -ENOMEM;
3241                         ptr->buffer_length = ptr->length;
3242                 }
3243                 if (ptr->flags & FD_RAW_WRITE)
3244                         ECALL(fd_copyin(ptr->data, ptr->kernel_data,
3245                                         ptr->length));
3246                 rcmd = &(ptr->next);
3247                 if (!(ptr->flags & FD_RAW_MORE))
3248                         return 0;
3249                 ptr->rate &= 0x43;
3250         }
3251 }
3252
3253 static int raw_cmd_ioctl(int cmd, void __user *param)
3254 {
3255         struct floppy_raw_cmd *my_raw_cmd;
3256         int drive;
3257         int ret2;
3258         int ret;
3259
3260         if (FDCS->rawcmd <= 1)
3261                 FDCS->rawcmd = 1;
3262         for (drive = 0; drive < N_DRIVE; drive++) {
3263                 if (FDC(drive) != fdc)
3264                         continue;
3265                 if (drive == current_drive) {
3266                         if (UDRS->fd_ref > 1) {
3267                                 FDCS->rawcmd = 2;
3268                                 break;
3269                         }
3270                 } else if (UDRS->fd_ref) {
3271                         FDCS->rawcmd = 2;
3272                         break;
3273                 }
3274         }
3275
3276         if (FDCS->reset)
3277                 return -EIO;
3278
3279         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3280         if (ret) {
3281                 raw_cmd_free(&my_raw_cmd);
3282                 return ret;
3283         }
3284
3285         raw_cmd = my_raw_cmd;
3286         cont = &raw_cmd_cont;
3287         ret = wait_til_done(floppy_start, 1);
3288 #ifdef DCL_DEBUG
3289         if (DP->flags & FD_DEBUG) {
3290                 DPRINT("calling disk change from raw_cmd ioctl\n");
3291         }
3292 #endif
3293
3294         if (ret != -EINTR && FDCS->reset)
3295                 ret = -EIO;
3296
3297         DRS->track = NO_TRACK;
3298
3299         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3300         if (!ret)
3301                 ret = ret2;
3302         raw_cmd_free(&my_raw_cmd);
3303         return ret;
3304 }
3305
3306 static int invalidate_drive(struct block_device *bdev)
3307 {
3308         /* invalidate the buffer track to force a reread */
3309         set_bit((long)bdev->bd_disk->private_data, &fake_change);
3310         process_fd_request();
3311         check_disk_change(bdev);
3312         return 0;
3313 }
3314
3315 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
3316                                int drive, int type, struct block_device *bdev)
3317 {
3318         int cnt;
3319
3320         /* sanity checking for parameters. */
3321         if (g->sect <= 0 ||
3322             g->head <= 0 ||
3323             g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3324             /* check if reserved bits are set */
3325             (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3326                 return -EINVAL;
3327         if (type) {
3328                 if (!capable(CAP_SYS_ADMIN))
3329                         return -EPERM;
3330                 mutex_lock(&open_lock);
3331                 LOCK_FDC(drive, 1);
3332                 floppy_type[type] = *g;
3333                 floppy_type[type].name = "user format";
3334                 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3335                         floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3336                             floppy_type[type].size + 1;
3337                 process_fd_request();
3338                 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3339                         struct block_device *bdev = opened_bdev[cnt];
3340                         if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3341                                 continue;
3342                         __invalidate_device(bdev);
3343                 }
3344                 mutex_unlock(&open_lock);
3345         } else {
3346                 int oldStretch;
3347                 LOCK_FDC(drive, 1);
3348                 if (cmd != FDDEFPRM)
3349                         /* notice a disk change immediately, else
3350                          * we lose our settings immediately*/
3351                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3352                 oldStretch = g->stretch;
3353                 user_params[drive] = *g;
3354                 if (buffer_drive == drive)
3355                         SUPBOUND(buffer_max, user_params[drive].sect);
3356                 current_type[drive] = &user_params[drive];
3357                 floppy_sizes[drive] = user_params[drive].size;
3358                 if (cmd == FDDEFPRM)
3359                         DRS->keep_data = -1;
3360                 else
3361                         DRS->keep_data = 1;
3362                 /* invalidation. Invalidate only when needed, i.e.
3363                  * when there are already sectors in the buffer cache
3364                  * whose number will change. This is useful, because
3365                  * mtools often changes the geometry of the disk after
3366                  * looking at the boot block */
3367                 if (DRS->maxblock > user_params[drive].sect ||
3368                     DRS->maxtrack ||
3369                     ((user_params[drive].sect ^ oldStretch) &
3370                      (FD_SWAPSIDES | FD_SECTBASEMASK)))
3371                         invalidate_drive(bdev);
3372                 else
3373                         process_fd_request();
3374         }
3375         return 0;
3376 }
3377
3378 /* handle obsolete ioctl's */
3379 static int ioctl_table[] = {
3380         FDCLRPRM,
3381         FDSETPRM,
3382         FDDEFPRM,
3383         FDGETPRM,
3384         FDMSGON,
3385         FDMSGOFF,
3386         FDFMTBEG,
3387         FDFMTTRK,
3388         FDFMTEND,
3389         FDSETEMSGTRESH,
3390         FDFLUSH,
3391         FDSETMAXERRS,
3392         FDGETMAXERRS,
3393         FDGETDRVTYP,
3394         FDSETDRVPRM,
3395         FDGETDRVPRM,
3396         FDGETDRVSTAT,
3397         FDPOLLDRVSTAT,
3398         FDRESET,
3399         FDGETFDCSTAT,
3400         FDWERRORCLR,
3401         FDWERRORGET,
3402         FDRAWCMD,
3403         FDEJECT,
3404         FDTWADDLE
3405 };
3406
3407 static inline int normalize_ioctl(int *cmd, int *size)
3408 {
3409         int i;
3410
3411         for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3412                 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3413                         *size = _IOC_SIZE(*cmd);
3414                         *cmd = ioctl_table[i];
3415                         if (*size > _IOC_SIZE(*cmd)) {
3416                                 printk("ioctl not yet supported\n");
3417                                 return -EFAULT;
3418                         }
3419                         return 0;
3420                 }
3421         }
3422         return -EINVAL;
3423 }
3424
3425 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3426 {
3427         if (type)
3428                 *g = &floppy_type[type];
3429         else {
3430                 LOCK_FDC(drive, 0);
3431                 CALL(poll_drive(0, 0));
3432                 process_fd_request();
3433                 *g = current_type[drive];
3434         }
3435         if (!*g)
3436                 return -ENODEV;
3437         return 0;
3438 }
3439
3440 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3441 {
3442         int drive = (long)bdev->bd_disk->private_data;
3443         int type = ITYPE(drive_state[drive].fd_device);
3444         struct floppy_struct *g;
3445         int ret;
3446
3447         ret = get_floppy_geometry(drive, type, &g);
3448         if (ret)
3449                 return ret;
3450
3451         geo->heads = g->head;
3452         geo->sectors = g->sect;
3453         geo->cylinders = g->track;
3454         return 0;
3455 }
3456
3457 static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3458                     unsigned long param)
3459 {
3460 #define FD_IOCTL_ALLOWED (mode & (FMODE_WRITE|FMODE_WRITE_IOCTL))
3461 #define OUT(c,x) case c: outparam = (const char *) (x); break
3462 #define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
3463
3464         int drive = (long)bdev->bd_disk->private_data;
3465         int type = ITYPE(UDRS->fd_device);
3466         int i;
3467         int ret;
3468         int size;
3469         union inparam {
3470                 struct floppy_struct g; /* geometry */
3471                 struct format_descr f;
3472                 struct floppy_max_errors max_errors;
3473                 struct floppy_drive_params dp;
3474         } inparam;              /* parameters coming from user space */
3475         const char *outparam;   /* parameters passed back to user space */
3476
3477         /* convert compatibility eject ioctls into floppy eject ioctl.
3478          * We do this in order to provide a means to eject floppy disks before
3479          * installing the new fdutils package */
3480         if (cmd == CDROMEJECT ||        /* CD-ROM eject */
3481             cmd == 0x6470 /* SunOS floppy eject */ ) {
3482                 DPRINT("obsolete eject ioctl\n");
3483                 DPRINT("please use floppycontrol --eject\n");
3484                 cmd = FDEJECT;
3485         }
3486
3487         /* convert the old style command into a new style command */
3488         if ((cmd & 0xff00) == 0x0200) {
3489                 ECALL(normalize_ioctl(&cmd, &size));
3490         } else
3491                 return -EINVAL;
3492
3493         /* permission checks */
3494         if (((cmd & 0x40) && !FD_IOCTL_ALLOWED) ||
3495             ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3496                 return -EPERM;
3497
3498         /* copyin */
3499         CLEARSTRUCT(&inparam);
3500         if (_IOC_DIR(cmd) & _IOC_WRITE)
3501             ECALL(fd_copyin((void __user *)param, &inparam, size))
3502
3503                 switch (cmd) {
3504                 case FDEJECT:
3505                         if (UDRS->fd_ref != 1)
3506                                 /* somebody else has this drive open */
3507                                 return -EBUSY;
3508                         LOCK_FDC(drive, 1);
3509
3510                         /* do the actual eject. Fails on
3511                          * non-Sparc architectures */
3512                         ret = fd_eject(UNIT(drive));
3513
3514                         USETF(FD_DISK_CHANGED);
3515                         USETF(FD_VERIFY);
3516                         process_fd_request();
3517                         return ret;
3518                 case FDCLRPRM:
3519                         LOCK_FDC(drive, 1);
3520                         current_type[drive] = NULL;
3521                         floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3522                         UDRS->keep_data = 0;
3523                         return invalidate_drive(bdev);
3524                 case FDSETPRM:
3525                 case FDDEFPRM:
3526                         return set_geometry(cmd, &inparam.g,
3527                                             drive, type, bdev);
3528                 case FDGETPRM:
3529                         ECALL(get_floppy_geometry(drive, type,
3530                                                   (struct floppy_struct **)
3531                                                   &outparam));
3532                         break;
3533
3534                 case FDMSGON:
3535                         UDP->flags |= FTD_MSG;
3536                         return 0;
3537                 case FDMSGOFF:
3538                         UDP->flags &= ~FTD_MSG;
3539                         return 0;
3540
3541                 case FDFMTBEG:
3542                         LOCK_FDC(drive, 1);
3543                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3544                         ret = UDRS->flags;
3545                         process_fd_request();
3546                         if (ret & FD_VERIFY)
3547                                 return -ENODEV;
3548                         if (!(ret & FD_DISK_WRITABLE))
3549                                 return -EROFS;
3550                         return 0;
3551                 case FDFMTTRK:
3552                         if (UDRS->fd_ref != 1)
3553                                 return -EBUSY;
3554                         return do_format(drive, &inparam.f);
3555                 case FDFMTEND:
3556                 case FDFLUSH:
3557                         LOCK_FDC(drive, 1);
3558                         return invalidate_drive(bdev);
3559
3560                 case FDSETEMSGTRESH:
3561                         UDP->max_errors.reporting =
3562                             (unsigned short)(param & 0x0f);
3563                         return 0;
3564                         OUT(FDGETMAXERRS, &UDP->max_errors);
3565                         IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
3566
3567                 case FDGETDRVTYP:
3568                         outparam = drive_name(type, drive);
3569                         SUPBOUND(size, strlen(outparam) + 1);
3570                         break;
3571
3572                         IN(FDSETDRVPRM, UDP, dp);
3573                         OUT(FDGETDRVPRM, UDP);
3574
3575                 case FDPOLLDRVSTAT:
3576                         LOCK_FDC(drive, 1);
3577                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3578                         process_fd_request();
3579                         /* fall through */
3580                         OUT(FDGETDRVSTAT, UDRS);
3581
3582                 case FDRESET:
3583                         return user_reset_fdc(drive, (int)param, 1);
3584
3585                         OUT(FDGETFDCSTAT, UFDCS);
3586
3587                 case FDWERRORCLR:
3588                         CLEARSTRUCT(UDRWE);
3589                         return 0;
3590                         OUT(FDWERRORGET, UDRWE);
3591
3592                 case FDRAWCMD:
3593                         if (type)
3594                                 return -EINVAL;
3595                         LOCK_FDC(drive, 1);
3596                         set_floppy(drive);
3597                         CALL(i = raw_cmd_ioctl(cmd, (void __user *)param));
3598                         process_fd_request();
3599                         return i;
3600
3601                 case FDTWADDLE:
3602                         LOCK_FDC(drive, 1);
3603                         twaddle();
3604                         process_fd_request();
3605                         return 0;
3606
3607                 default:
3608                         return -EINVAL;
3609                 }
3610
3611         if (_IOC_DIR(cmd) & _IOC_READ)
3612                 return fd_copyout((void __user *)param, outparam, size);
3613         else
3614                 return 0;
3615 #undef OUT
3616 #undef IN
3617 }
3618
3619 static void __init config_types(void)
3620 {
3621         int first = 1;
3622         int drive;
3623
3624         /* read drive info out of physical CMOS */
3625         drive = 0;
3626         if (!UDP->cmos)
3627                 UDP->cmos = FLOPPY0_TYPE;
3628         drive = 1;
3629         if (!UDP->cmos && FLOPPY1_TYPE)
3630                 UDP->cmos = FLOPPY1_TYPE;
3631
3632         /* FIXME: additional physical CMOS drive detection should go here */
3633
3634         for (drive = 0; drive < N_DRIVE; drive++) {
3635                 unsigned int type = UDP->cmos;
3636                 struct floppy_drive_params *params;
3637                 const char *name = NULL;
3638                 static char temparea[32];
3639
3640                 if (type < ARRAY_SIZE(default_drive_params)) {
3641                         params = &default_drive_params[type].params;
3642                         if (type) {
3643                                 name = default_drive_params[type].name;
3644                                 allowed_drive_mask |= 1 << drive;
3645                         } else
3646                                 allowed_drive_mask &= ~(1 << drive);
3647                 } else {
3648                         params = &default_drive_params[0].params;
3649                         sprintf(temparea, "unknown type %d (usb?)", type);
3650                         name = temparea;
3651                 }
3652                 if (name) {
3653                         const char *prepend = ",";
3654                         if (first) {
3655                                 prepend = KERN_INFO "Floppy drive(s):";
3656                                 first = 0;
3657                         }
3658                         printk("%s fd%d is %s", prepend, drive, name);
3659                 }
3660                 *UDP = *params;
3661         }
3662         if (!first)
3663                 printk("\n");
3664 }
3665
3666 static int floppy_release(struct gendisk *disk, fmode_t mode)
3667 {
3668         int drive = (long)disk->private_data;
3669
3670         mutex_lock(&open_lock);
3671         if (UDRS->fd_ref < 0)
3672                 UDRS->fd_ref = 0;
3673         else if (!UDRS->fd_ref--) {
3674                 DPRINT("floppy_release with fd_ref == 0");
3675                 UDRS->fd_ref = 0;
3676         }
3677         if (!UDRS->fd_ref)
3678                 opened_bdev[drive] = NULL;
3679         mutex_unlock(&open_lock);
3680
3681         return 0;
3682 }
3683
3684 /*
3685  * floppy_open check for aliasing (/dev/fd0 can be the same as
3686  * /dev/PS0 etc), and disallows simultaneous access to the same
3687  * drive with different device numbers.
3688  */
3689 static int floppy_open(struct block_device *bdev, fmode_t mode)
3690 {
3691         int drive = (long)bdev->bd_disk->private_data;
3692         int old_dev, new_dev;
3693         int try;
3694         int res = -EBUSY;
3695         char *tmp;
3696
3697         mutex_lock(&open_lock);
3698         old_dev = UDRS->fd_device;
3699         if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3700                 goto out2;
3701
3702         if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3703                 USETF(FD_DISK_CHANGED);
3704                 USETF(FD_VERIFY);
3705         }
3706
3707         if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
3708                 goto out2;
3709
3710         if (mode & FMODE_EXCL)
3711                 UDRS->fd_ref = -1;
3712         else
3713                 UDRS->fd_ref++;
3714
3715         opened_bdev[drive] = bdev;
3716
3717         res = -ENXIO;
3718
3719         if (!floppy_track_buffer) {
3720                 /* if opening an ED drive, reserve a big buffer,
3721                  * else reserve a small one */
3722                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3723                         try = 64;       /* Only 48 actually useful */
3724                 else
3725                         try = 32;       /* Only 24 actually useful */
3726
3727                 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3728                 if (!tmp && !floppy_track_buffer) {
3729                         try >>= 1;      /* buffer only one side */
3730                         INFBOUND(try, 16);
3731                         tmp = (char *)fd_dma_mem_alloc(1024 * try);
3732                 }
3733                 if (!tmp && !floppy_track_buffer) {
3734                         fallback_on_nodma_alloc(&tmp, 2048 * try);
3735                 }
3736                 if (!tmp && !floppy_track_buffer) {
3737                         DPRINT("Unable to allocate DMA memory\n");
3738                         goto out;
3739                 }
3740                 if (floppy_track_buffer) {
3741                         if (tmp)
3742                                 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3743                 } else {
3744                         buffer_min = buffer_max = -1;
3745                         floppy_track_buffer = tmp;
3746                         max_buffer_sectors = try;
3747                 }
3748         }
3749
3750         new_dev = MINOR(bdev->bd_dev);
3751         UDRS->fd_device = new_dev;
3752         set_capacity(disks[drive], floppy_sizes[new_dev]);
3753         if (old_dev != -1 && old_dev != new_dev) {
3754                 if (buffer_drive == drive)
3755                         buffer_track = -1;
3756         }
3757
3758         if (UFDCS->rawcmd == 1)
3759                 UFDCS->rawcmd = 2;
3760
3761         if (!(mode & FMODE_NDELAY)) {
3762                 if (mode & (FMODE_READ|FMODE_WRITE)) {
3763                         UDRS->last_checked = 0;
3764                         check_disk_change(bdev);
3765                         if (UTESTF(FD_DISK_CHANGED))
3766                                 goto out;
3767                 }
3768                 res = -EROFS;
3769                 if ((mode & FMODE_WRITE) && !(UTESTF(FD_DISK_WRITABLE)))
3770                         goto out;
3771         }
3772         mutex_unlock(&open_lock);
3773         return 0;
3774 out:
3775         if (UDRS->fd_ref < 0)
3776                 UDRS->fd_ref = 0;
3777         else
3778                 UDRS->fd_ref--;
3779         if (!UDRS->fd_ref)
3780                 opened_bdev[drive] = NULL;
3781 out2:
3782         mutex_unlock(&open_lock);
3783         return res;
3784 }
3785
3786 /*
3787  * Check if the disk has been changed or if a change has been faked.
3788  */
3789 static int check_floppy_change(struct gendisk *disk)
3790 {
3791         int drive = (long)disk->private_data;
3792
3793         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3794                 return 1;
3795
3796         if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3797                 lock_fdc(drive, 0);
3798                 poll_drive(0, 0);
3799                 process_fd_request();
3800         }
3801
3802         if (UTESTF(FD_DISK_CHANGED) ||
3803             UTESTF(FD_VERIFY) ||
3804             test_bit(drive, &fake_change) ||
3805             (!ITYPE(UDRS->fd_device) && !current_type[drive]))
3806                 return 1;
3807         return 0;
3808 }
3809
3810 /*
3811  * This implements "read block 0" for floppy_revalidate().
3812  * Needed for format autodetection, checking whether there is
3813  * a disk in the drive, and whether that disk is writable.
3814  */
3815
3816 static void floppy_rb0_complete(struct bio *bio,
3817                                int err)
3818 {
3819         complete((struct completion *)bio->bi_private);
3820 }
3821
3822 static int __floppy_read_block_0(struct block_device *bdev)
3823 {
3824         struct bio bio;
3825         struct bio_vec bio_vec;
3826         struct completion complete;
3827         struct page *page;
3828         size_t size;
3829
3830         page = alloc_page(GFP_NOIO);
3831         if (!page) {
3832                 process_fd_request();
3833                 return -ENOMEM;
3834         }
3835
3836         size = bdev->bd_block_size;
3837         if (!size)
3838                 size = 1024;
3839
3840         bio_init(&bio);
3841         bio.bi_io_vec = &bio_vec;
3842         bio_vec.bv_page = page;
3843         bio_vec.bv_len = size;
3844         bio_vec.bv_offset = 0;
3845         bio.bi_vcnt = 1;
3846         bio.bi_idx = 0;
3847         bio.bi_size = size;
3848         bio.bi_bdev = bdev;
3849         bio.bi_sector = 0;
3850         init_completion(&complete);
3851         bio.bi_private = &complete;
3852         bio.bi_end_io = floppy_rb0_complete;
3853
3854         submit_bio(READ, &bio);
3855         generic_unplug_device(bdev_get_queue(bdev));
3856         process_fd_request();
3857         wait_for_completion(&complete);
3858
3859         __free_page(page);
3860
3861         return 0;
3862 }
3863
3864 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3865  * the bootblock (block 0). "Autodetection" is also needed to check whether
3866  * there is a disk in the drive at all... Thus we also do it for fixed
3867  * geometry formats */
3868 static int floppy_revalidate(struct gendisk *disk)
3869 {
3870         int drive = (long)disk->private_data;
3871 #define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
3872         int cf;
3873         int res = 0;
3874
3875         if (UTESTF(FD_DISK_CHANGED) ||
3876             UTESTF(FD_VERIFY) || test_bit(drive, &fake_change) || NO_GEOM) {
3877                 if (usage_count == 0) {
3878                         printk("VFS: revalidate called on non-open device.\n");
3879                         return -EFAULT;
3880                 }
3881                 lock_fdc(drive, 0);
3882                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3883                 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
3884                         process_fd_request();   /*already done by another thread */
3885                         return 0;
3886                 }
3887                 UDRS->maxblock = 0;
3888                 UDRS->maxtrack = 0;
3889                 if (buffer_drive == drive)
3890                         buffer_track = -1;
3891                 clear_bit(drive, &fake_change);
3892                 UCLEARF(FD_DISK_CHANGED);
3893                 if (cf)
3894                         UDRS->generation++;
3895                 if (NO_GEOM) {
3896                         /* auto-sensing */
3897                         res = __floppy_read_block_0(opened_bdev[drive]);
3898                 } else {
3899                         if (cf)
3900                                 poll_drive(0, FD_RAW_NEED_DISK);
3901                         process_fd_request();
3902                 }
3903         }
3904         set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3905         return res;
3906 }
3907
3908 static struct block_device_operations floppy_fops = {
3909         .owner                  = THIS_MODULE,
3910         .open                   = floppy_open,
3911         .release                = floppy_release,
3912         .locked_ioctl           = fd_ioctl,
3913         .getgeo                 = fd_getgeo,
3914         .media_changed          = check_floppy_change,
3915         .revalidate_disk        = floppy_revalidate,
3916 };
3917
3918 /*
3919  * Floppy Driver initialization
3920  * =============================
3921  */
3922
3923 /* Determine the floppy disk controller type */
3924 /* This routine was written by David C. Niemi */
3925 static char __init get_fdc_version(void)
3926 {
3927         int r;
3928
3929         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3930         if (FDCS->reset)
3931                 return FDC_NONE;
3932         if ((r = result()) <= 0x00)
3933                 return FDC_NONE;        /* No FDC present ??? */
3934         if ((r == 1) && (reply_buffer[0] == 0x80)) {
3935                 printk(KERN_INFO "FDC %d is an 8272A\n", fdc);
3936                 return FDC_8272A;       /* 8272a/765 don't know DUMPREGS */
3937         }
3938         if (r != 10) {
3939                 printk
3940                     ("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3941                      fdc, r);
3942                 return FDC_UNKNOWN;
3943         }
3944
3945         if (!fdc_configure()) {
3946                 printk(KERN_INFO "FDC %d is an 82072\n", fdc);
3947                 return FDC_82072;       /* 82072 doesn't know CONFIGURE */
3948         }
3949
3950         output_byte(FD_PERPENDICULAR);
3951         if (need_more_output() == MORE_OUTPUT) {
3952                 output_byte(0);
3953         } else {
3954                 printk(KERN_INFO "FDC %d is an 82072A\n", fdc);
3955                 return FDC_82072A;      /* 82072A as found on Sparcs. */
3956         }
3957
3958         output_byte(FD_UNLOCK);
3959         r = result();
3960         if ((r == 1) && (reply_buffer[0] == 0x80)) {
3961                 printk(KERN_INFO "FDC %d is a pre-1991 82077\n", fdc);
3962                 return FDC_82077_ORIG;  /* Pre-1991 82077, doesn't know 
3963                                          * LOCK/UNLOCK */
3964         }
3965         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3966                 printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3967                        fdc, r);
3968                 return FDC_UNKNOWN;
3969         }
3970         output_byte(FD_PARTID);
3971         r = result();
3972         if (r != 1) {
3973                 printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3974                        fdc, r);
3975                 return FDC_UNKNOWN;
3976         }
3977         if (reply_buffer[0] == 0x80) {
3978                 printk(KERN_INFO "FDC %d is a post-1991 82077\n", fdc);
3979                 return FDC_82077;       /* Revised 82077AA passes all the tests */
3980         }
3981         switch (reply_buffer[0] >> 5) {
3982         case 0x0:
3983                 /* Either a 82078-1 or a 82078SL running at 5Volt */
3984                 printk(KERN_INFO "FDC %d is an 82078.\n", fdc);
3985                 return FDC_82078;
3986         case 0x1:
3987                 printk(KERN_INFO "FDC %d is a 44pin 82078\n", fdc);
3988                 return FDC_82078;
3989         case 0x2:
3990                 printk(KERN_INFO "FDC %d is a S82078B\n", fdc);
3991                 return FDC_S82078B;
3992         case 0x3:
3993                 printk(KERN_INFO "FDC %d is a National Semiconductor PC87306\n",
3994                        fdc);
3995                 return FDC_87306;
3996         default:
3997                 printk(KERN_INFO
3998                        "FDC %d init: 82078 variant with unknown PARTID=%d.\n",
3999                        fdc, reply_buffer[0] >> 5);
4000                 return FDC_82078_UNKN;
4001         }
4002 }                               /* get_fdc_version */
4003
4004 /* lilo configuration */
4005
4006 static void __init floppy_set_flags(int *ints, int param, int param2)
4007 {
4008         int i;
4009
4010         for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4011                 if (param)
4012                         default_drive_params[i].params.flags |= param2;
4013                 else
4014                         default_drive_params[i].params.flags &= ~param2;
4015         }
4016         DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4017 }
4018
4019 static void __init daring(int *ints, int param, int param2)
4020 {
4021         int i;
4022
4023         for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4024                 if (param) {
4025                         default_drive_params[i].params.select_delay = 0;
4026                         default_drive_params[i].params.flags |=
4027                             FD_SILENT_DCL_CLEAR;
4028                 } else {
4029                         default_drive_params[i].params.select_delay =
4030                             2 * HZ / 100;
4031                         default_drive_params[i].params.flags &=
4032                             ~FD_SILENT_DCL_CLEAR;
4033                 }
4034         }
4035         DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4036 }
4037
4038 static void __init set_cmos(int *ints, int dummy, int dummy2)
4039 {
4040         int current_drive = 0;
4041
4042         if (ints[0] != 2) {
4043                 DPRINT("wrong number of parameters for CMOS\n");
4044                 return;
4045         }
4046         current_drive = ints[1];
4047         if (current_drive < 0 || current_drive >= 8) {
4048                 DPRINT("bad drive for set_cmos\n");
4049                 return;
4050         }
4051 #if N_FDC > 1
4052         if (current_drive >= 4 && !FDC2)
4053                 FDC2 = 0x370;
4054 #endif
4055         DP->cmos = ints[2];
4056         DPRINT("setting CMOS code to %d\n", ints[2]);
4057 }
4058
4059 static struct param_table {
4060         const char *name;
4061         void (*fn) (int *ints, int param, int param2);
4062         int *var;
4063         int def_param;
4064         int param2;
4065 } config_params[] __initdata = {
4066         {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4067         {"all_drives", NULL, &allowed_drive_mask, 0xff, 0},     /* obsolete */
4068         {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4069         {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4070         {"dma", NULL, &FLOPPY_DMA, 2, 0},
4071         {"daring", daring, NULL, 1, 0},
4072 #if N_FDC > 1
4073         {"two_fdc", NULL, &FDC2, 0x370, 0},
4074         {"one_fdc", NULL, &FDC2, 0, 0},
4075 #endif
4076         {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4077         {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4078         {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4079         {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4080         {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4081         {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4082         {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4083         {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4084         {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4085         {"nofifo", NULL, &no_fifo, 0x20, 0},
4086         {"usefifo", NULL, &no_fifo, 0, 0},
4087         {"cmos", set_cmos, NULL, 0, 0},
4088         {"slow", NULL, &slow_floppy, 1, 0},
4089         {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4090         {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4091         {"L40SX", NULL, &print_unex, 0, 0}
4092
4093         EXTRA_FLOPPY_PARAMS
4094 };
4095
4096 static int __init floppy_setup(char *str)
4097 {
4098         int i;
4099         int param;
4100         int ints[11];
4101
4102         str = get_options(str, ARRAY_SIZE(ints), ints);
4103         if (str) {
4104                 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4105                         if (strcmp(str, config_params[i].name) == 0) {
4106                                 if (ints[0])
4107                                         param = ints[1];
4108                                 else
4109                                         param = config_params[i].def_param;
4110                                 if (config_params[i].fn)
4111                                         config_params[i].
4112                                             fn(ints, param,
4113                                                config_params[i].param2);
4114                                 if (config_params[i].var) {
4115                                         DPRINT("%s=%d\n", str, param);
4116                                         *config_params[i].var = param;
4117                                 }
4118                                 return 1;
4119                         }
4120                 }
4121         }
4122         if (str) {
4123                 DPRINT("unknown floppy option [%s]\n", str);
4124
4125                 DPRINT("allowed options are:");
4126                 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4127                         printk(" %s", config_params[i].name);
4128                 printk("\n");
4129         } else
4130                 DPRINT("botched floppy option\n");
4131         DPRINT("Read Documentation/blockdev/floppy.txt\n");
4132         return 0;
4133 }
4134
4135 static int have_no_fdc = -ENODEV;
4136
4137 static ssize_t floppy_cmos_show(struct device *dev,
4138                                 struct device_attribute *attr, char *buf)
4139 {
4140         struct platform_device *p = to_platform_device(dev);
4141         int drive;
4142
4143         drive = p->id;
4144         return sprintf(buf, "%X\n", UDP->cmos);
4145 }
4146 DEVICE_ATTR(cmos,S_IRUGO,floppy_cmos_show,NULL);
4147
4148 static void floppy_device_release(struct device *dev)
4149 {
4150 }
4151
4152 static struct platform_device floppy_device[N_DRIVE];
4153
4154 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4155 {
4156         int drive = (*part & 3) | ((*part & 0x80) >> 5);
4157         if (drive >= N_DRIVE ||
4158             !(allowed_drive_mask & (1 << drive)) ||
4159             fdc_state[FDC(drive)].version == FDC_NONE)
4160                 return NULL;
4161         if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4162                 return NULL;
4163         *part = 0;
4164         return get_disk(disks[drive]);
4165 }
4166
4167 static int __init floppy_init(void)
4168 {
4169         int i, unit, drive;
4170         int err, dr;
4171
4172 #if defined(CONFIG_PPC)
4173         if (check_legacy_ioport(FDC1))
4174                 return -ENODEV;
4175 #endif
4176
4177         raw_cmd = NULL;
4178
4179         for (dr = 0; dr < N_DRIVE; dr++) {
4180                 disks[dr] = alloc_disk(1);
4181                 if (!disks[dr]) {
4182                         err = -ENOMEM;
4183                         goto out_put_disk;
4184                 }
4185
4186                 disks[dr]->major = FLOPPY_MAJOR;
4187                 disks[dr]->first_minor = TOMINOR(dr);
4188                 disks[dr]->fops = &floppy_fops;
4189                 sprintf(disks[dr]->disk_name, "fd%d", dr);
4190
4191                 init_timer(&motor_off_timer[dr]);
4192                 motor_off_timer[dr].data = dr;
4193                 motor_off_timer[dr].function = motor_off_callback;
4194         }
4195
4196         err = register_blkdev(FLOPPY_MAJOR, "fd");
4197         if (err)
4198                 goto out_put_disk;
4199
4200         floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
4201         if (!floppy_queue) {
4202                 err = -ENOMEM;
4203                 goto out_unreg_blkdev;
4204         }
4205         blk_queue_max_sectors(floppy_queue, 64);
4206
4207         blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4208                             floppy_find, NULL, NULL);
4209
4210         for (i = 0; i < 256; i++)
4211                 if (ITYPE(i))
4212                         floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4213                 else
4214                         floppy_sizes[i] = MAX_DISK_SIZE << 1;
4215
4216         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
4217         config_types();
4218
4219         for (i = 0; i < N_FDC; i++) {
4220                 fdc = i;
4221                 CLEARSTRUCT(FDCS);
4222                 FDCS->dtr = -1;
4223                 FDCS->dor = 0x4;
4224 #if defined(__sparc__) || defined(__mc68000__)
4225                 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4226 #ifdef __mc68000__
4227                 if (MACH_IS_SUN3X)
4228 #endif
4229                         FDCS->version = FDC_82072A;
4230 #endif
4231         }
4232
4233         use_virtual_dma = can_use_virtual_dma & 1;
4234         fdc_state[0].address = FDC1;
4235         if (fdc_state[0].address == -1) {
4236                 del_timer(&fd_timeout);
4237                 err = -ENODEV;
4238                 goto out_unreg_region;
4239         }
4240 #if N_FDC > 1
4241         fdc_state[1].address = FDC2;
4242 #endif
4243
4244         fdc = 0;                /* reset fdc in case of unexpected interrupt */
4245         err = floppy_grab_irq_and_dma();
4246         if (err) {
4247                 del_timer(&fd_timeout);
4248                 err = -EBUSY;
4249                 goto out_unreg_region;
4250         }
4251
4252         /* initialise drive state */
4253         for (drive = 0; drive < N_DRIVE; drive++) {
4254                 CLEARSTRUCT(UDRS);
4255                 CLEARSTRUCT(UDRWE);
4256                 USETF(FD_DISK_NEWCHANGE);
4257                 USETF(FD_DISK_CHANGED);
4258                 USETF(FD_VERIFY);
4259                 UDRS->fd_device = -1;
4260                 floppy_track_buffer = NULL;
4261                 max_buffer_sectors = 0;
4262         }
4263         /*
4264          * Small 10 msec delay to let through any interrupt that
4265          * initialization might have triggered, to not
4266          * confuse detection:
4267          */
4268         msleep(10);
4269
4270         for (i = 0; i < N_FDC; i++) {
4271                 fdc = i;
4272                 FDCS->driver_version = FD_DRIVER_VERSION;
4273                 for (unit = 0; unit < 4; unit++)
4274                         FDCS->track[unit] = 0;
4275                 if (FDCS->address == -1)
4276                         continue;
4277                 FDCS->rawcmd = 2;
4278                 if (user_reset_fdc(-1, FD_RESET_ALWAYS, 0)) {
4279                         /* free ioports reserved by floppy_grab_irq_and_dma() */
4280                         floppy_release_regions(fdc);
4281                         FDCS->address = -1;
4282                         FDCS->version = FDC_NONE;
4283                         continue;
4284                 }
4285                 /* Try to determine the floppy controller type */
4286                 FDCS->version = get_fdc_version();
4287                 if (FDCS->version == FDC_NONE) {
4288                         /* free ioports reserved by floppy_grab_irq_and_dma() */
4289                         floppy_release_regions(fdc);
4290                         FDCS->address = -1;
4291                         continue;
4292                 }
4293                 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4294                         can_use_virtual_dma = 0;
4295
4296                 have_no_fdc = 0;
4297                 /* Not all FDCs seem to be able to handle the version command
4298                  * properly, so force a reset for the standard FDC clones,
4299                  * to avoid interrupt garbage.
4300                  */
4301                 user_reset_fdc(-1, FD_RESET_ALWAYS, 0);
4302         }
4303         fdc = 0;
4304         del_timer(&fd_timeout);
4305         current_drive = 0;
4306         initialising = 0;
4307         if (have_no_fdc) {
4308                 DPRINT("no floppy controllers found\n");
4309                 err = have_no_fdc;
4310                 goto out_flush_work;
4311         }
4312
4313         for (drive = 0; drive < N_DRIVE; drive++) {
4314                 if (!(allowed_drive_mask & (1 << drive)))
4315                         continue;
4316                 if (fdc_state[FDC(drive)].version == FDC_NONE)
4317                         continue;
4318
4319                 floppy_device[drive].name = floppy_device_name;
4320                 floppy_device[drive].id = drive;
4321                 floppy_device[drive].dev.release = floppy_device_release;
4322
4323                 err = platform_device_register(&floppy_device[drive]);
4324                 if (err)
4325                         goto out_flush_work;
4326
4327                 err = device_create_file(&floppy_device[drive].dev,&dev_attr_cmos);
4328                 if (err)
4329                         goto out_unreg_platform_dev;
4330
4331                 /* to be cleaned up... */
4332                 disks[drive]->private_data = (void *)(long)drive;
4333                 disks[drive]->queue = floppy_queue;
4334                 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4335                 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4336                 add_disk(disks[drive]);
4337         }
4338
4339         return 0;
4340
4341 out_unreg_platform_dev:
4342         platform_device_unregister(&floppy_device[drive]);
4343 out_flush_work:
4344         flush_scheduled_work();
4345         if (usage_count)
4346                 floppy_release_irq_and_dma();
4347 out_unreg_region:
4348         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4349         blk_cleanup_queue(floppy_queue);
4350 out_unreg_blkdev:
4351         unregister_blkdev(FLOPPY_MAJOR, "fd");
4352 out_put_disk:
4353         while (dr--) {
4354                 del_timer(&motor_off_timer[dr]);
4355                 put_disk(disks[dr]);
4356         }
4357         return err;
4358 }
4359
4360 static DEFINE_SPINLOCK(floppy_usage_lock);
4361
4362 static const struct io_region {
4363         int offset;
4364         int size;
4365 } io_regions[] = {
4366         { 2, 1 },
4367         /* address + 3 is sometimes reserved by pnp bios for motherboard */
4368         { 4, 2 },
4369         /* address + 6 is reserved, and may be taken by IDE.
4370          * Unfortunately, Adaptec doesn't know this :-(, */
4371         { 7, 1 },
4372 };
4373
4374 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4375 {
4376         while (p != io_regions) {
4377                 p--;
4378                 release_region(FDCS->address + p->offset, p->size);
4379         }
4380 }
4381
4382 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4383
4384 static int floppy_request_regions(int fdc)
4385 {
4386         const struct io_region *p;
4387
4388         for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4389                 if (!request_region(FDCS->address + p->offset, p->size, "floppy")) {
4390                         DPRINT("Floppy io-port 0x%04lx in use\n", FDCS->address + p->offset);
4391                         floppy_release_allocated_regions(fdc, p);
4392                         return -EBUSY;
4393                 }
4394         }
4395         return 0;
4396 }
4397
4398 static void floppy_release_regions(int fdc)
4399 {
4400         floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4401 }
4402
4403 static int floppy_grab_irq_and_dma(void)
4404 {
4405         unsigned long flags;
4406
4407         spin_lock_irqsave(&floppy_usage_lock, flags);
4408         if (usage_count++) {
4409                 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4410                 return 0;
4411         }
4412         spin_unlock_irqrestore(&floppy_usage_lock, flags);
4413
4414         /*
4415          * We might have scheduled a free_irq(), wait it to
4416          * drain first:
4417          */
4418         flush_scheduled_work();
4419
4420         if (fd_request_irq()) {
4421                 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4422                        FLOPPY_IRQ);
4423                 spin_lock_irqsave(&floppy_usage_lock, flags);
4424                 usage_count--;
4425                 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4426                 return -1;
4427         }
4428         if (fd_request_dma()) {
4429                 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4430                        FLOPPY_DMA);
4431                 if (can_use_virtual_dma & 2)
4432                         use_virtual_dma = can_use_virtual_dma = 1;
4433                 if (!(can_use_virtual_dma & 1)) {
4434                         fd_free_irq();
4435                         spin_lock_irqsave(&floppy_usage_lock, flags);
4436                         usage_count--;
4437                         spin_unlock_irqrestore(&floppy_usage_lock, flags);
4438                         return -1;
4439                 }
4440         }
4441
4442         for (fdc = 0; fdc < N_FDC; fdc++) {
4443                 if (FDCS->address != -1) {
4444                         if (floppy_request_regions(fdc))
4445                                 goto cleanup;
4446                 }
4447         }
4448         for (fdc = 0; fdc < N_FDC; fdc++) {
4449                 if (FDCS->address != -1) {
4450                         reset_fdc_info(1);
4451                         fd_outb(FDCS->dor, FD_DOR);
4452                 }
4453         }
4454         fdc = 0;
4455         set_dor(0, ~0, 8);      /* avoid immediate interrupt */
4456
4457         for (fdc = 0; fdc < N_FDC; fdc++)
4458                 if (FDCS->address != -1)
4459                         fd_outb(FDCS->dor, FD_DOR);
4460         /*
4461          * The driver will try and free resources and relies on us
4462          * to know if they were allocated or not.
4463          */
4464         fdc = 0;
4465         irqdma_allocated = 1;
4466         return 0;
4467 cleanup:
4468         fd_free_irq();
4469         fd_free_dma();
4470         while (--fdc >= 0)
4471                 floppy_release_regions(fdc);
4472         spin_lock_irqsave(&floppy_usage_lock, flags);
4473         usage_count--;
4474         spin_unlock_irqrestore(&floppy_usage_lock, flags);
4475         return -1;
4476 }
4477
4478 static void floppy_release_irq_and_dma(void)
4479 {
4480         int old_fdc;
4481 #ifdef FLOPPY_SANITY_CHECK
4482 #ifndef __sparc__
4483         int drive;
4484 #endif
4485 #endif
4486         long tmpsize;
4487         unsigned long tmpaddr;
4488         unsigned long flags;
4489
4490         spin_lock_irqsave(&floppy_usage_lock, flags);
4491         if (--usage_count) {
4492                 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4493                 return;
4494         }
4495         spin_unlock_irqrestore(&floppy_usage_lock, flags);
4496         if (irqdma_allocated) {
4497                 fd_disable_dma();
4498                 fd_free_dma();
4499                 fd_free_irq();
4500                 irqdma_allocated = 0;
4501         }
4502         set_dor(0, ~0, 8);
4503 #if N_FDC > 1
4504         set_dor(1, ~8, 0);
4505 #endif
4506         floppy_enable_hlt();
4507
4508         if (floppy_track_buffer && max_buffer_sectors) {
4509                 tmpsize = max_buffer_sectors * 1024;
4510                 tmpaddr = (unsigned long)floppy_track_buffer;
4511                 floppy_track_buffer = NULL;
4512                 max_buffer_sectors = 0;
4513                 buffer_min = buffer_max = -1;
4514                 fd_dma_mem_free(tmpaddr, tmpsize);
4515         }
4516 #ifdef FLOPPY_SANITY_CHECK
4517 #ifndef __sparc__
4518         for (drive = 0; drive < N_FDC * 4; drive++)
4519                 if (timer_pending(motor_off_timer + drive))
4520                         printk("motor off timer %d still active\n", drive);
4521 #endif
4522
4523         if (timer_pending(&fd_timeout))
4524                 printk("floppy timer still active:%s\n", timeout_message);
4525         if (timer_pending(&fd_timer))
4526                 printk("auxiliary floppy timer still active\n");
4527         if (work_pending(&floppy_work))
4528                 printk("work still pending\n");
4529 #endif
4530         old_fdc = fdc;
4531         for (fdc = 0; fdc < N_FDC; fdc++)
4532                 if (FDCS->address != -1)
4533                         floppy_release_regions(fdc);
4534         fdc = old_fdc;
4535 }
4536
4537 #ifdef MODULE
4538
4539 static char *floppy;
4540
4541 static void __init parse_floppy_cfg_string(char *cfg)
4542 {
4543         char *ptr;
4544
4545         while (*cfg) {
4546                 for (ptr = cfg; *cfg && *cfg != ' ' && *cfg != '\t'; cfg++) ;
4547                 if (*cfg) {
4548                         *cfg = '\0';
4549                         cfg++;
4550                 }
4551                 if (*ptr)
4552                         floppy_setup(ptr);
4553         }
4554 }
4555
4556 static int __init floppy_module_init(void)
4557 {
4558         if (floppy)
4559                 parse_floppy_cfg_string(floppy);
4560         return floppy_init();
4561 }
4562 module_init(floppy_module_init);
4563
4564 static void __exit floppy_module_exit(void)
4565 {
4566         int drive;
4567
4568         blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4569         unregister_blkdev(FLOPPY_MAJOR, "fd");
4570
4571         for (drive = 0; drive < N_DRIVE; drive++) {
4572                 del_timer_sync(&motor_off_timer[drive]);
4573
4574                 if ((allowed_drive_mask & (1 << drive)) &&
4575                     fdc_state[FDC(drive)].version != FDC_NONE) {
4576                         del_gendisk(disks[drive]);
4577                         device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4578                         platform_device_unregister(&floppy_device[drive]);
4579                 }
4580                 put_disk(disks[drive]);
4581         }
4582
4583         del_timer_sync(&fd_timeout);
4584         del_timer_sync(&fd_timer);
4585         blk_cleanup_queue(floppy_queue);
4586
4587         if (usage_count)
4588                 floppy_release_irq_and_dma();
4589
4590         /* eject disk, if any */
4591         fd_eject(0);
4592 }
4593 module_exit(floppy_module_exit);
4594
4595 module_param(floppy, charp, 0);
4596 module_param(FLOPPY_IRQ, int, 0);
4597 module_param(FLOPPY_DMA, int, 0);
4598 MODULE_AUTHOR("Alain L. Knaff");
4599 MODULE_SUPPORTED_DEVICE("fd");
4600 MODULE_LICENSE("GPL");
4601
4602 /* This doesn't actually get used other than for module information */
4603 static const struct pnp_device_id floppy_pnpids[] = {
4604         { "PNP0700", 0 },
4605         { }
4606 };
4607 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4608
4609 #else
4610
4611 __setup("floppy=", floppy_setup);
4612 module_init(floppy_init)
4613 #endif
4614
4615 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);