[PATCH] remove do_sync parameter from __invalidate_device
[linux-3.10.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  * 02.12.91 - Changed to static variables to indicate need for reset
10  * and recalibrate. This makes some things easier (output_byte reset
11  * checking etc), and means less interrupt jumping in case of errors,
12  * so the code is hopefully easier to understand.
13  */
14
15 /*
16  * This file is certainly a mess. I've tried my best to get it working,
17  * but I don't like programming floppies, and I have only one anyway.
18  * Urgel. I should check for more errors, and do more graceful error
19  * recovery. Seems there are problems with several drives. I've tried to
20  * correct them. No promises.
21  */
22
23 /*
24  * As with hd.c, all routines within this file can (and will) be called
25  * by interrupts, so extreme caution is needed. A hardware interrupt
26  * handler may not sleep, or a kernel panic will happen. Thus I cannot
27  * call "floppy-on" directly, but have to set a special timer interrupt
28  * etc.
29  */
30
31 /*
32  * 28.02.92 - made track-buffering routines, based on the routines written
33  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
34  */
35
36 /*
37  * Automatic floppy-detection and formatting written by Werner Almesberger
38  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
39  * the floppy-change signal detection.
40  */
41
42 /*
43  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
44  * FDC data overrun bug, added some preliminary stuff for vertical
45  * recording support.
46  *
47  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
48  *
49  * TODO: Errors are still not counted properly.
50  */
51
52 /* 1992/9/20
53  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
54  * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
55  * Christoph H. Hochst\"atter.
56  * I have fixed the shift values to the ones I always use. Maybe a new
57  * ioctl() should be created to be able to modify them.
58  * There is a bug in the driver that makes it impossible to format a
59  * floppy as the first thing after bootup.
60  */
61
62 /*
63  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
64  * this helped the floppy driver as well. Much cleaner, and still seems to
65  * work.
66  */
67
68 /* 1994/6/24 --bbroad-- added the floppy table entries and made
69  * minor modifications to allow 2.88 floppies to be run.
70  */
71
72 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
73  * disk types.
74  */
75
76 /*
77  * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
78  * format bug fixes, but unfortunately some new bugs too...
79  */
80
81 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
82  * errors to allow safe writing by specialized programs.
83  */
84
85 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
86  * by defining bit 1 of the "stretch" parameter to mean put sectors on the
87  * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
88  * drives are "upside-down").
89  */
90
91 /*
92  * 1995/8/26 -- Andreas Busse -- added Mips support.
93  */
94
95 /*
96  * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
97  * features to asm/floppy.h.
98  */
99
100 /*
101  * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
102  * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
103  * use of '0' for NULL.
104  */
105
106 /*
107  * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
108  * failures.
109  */
110
111 /*
112  * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
113  */
114
115 /*
116  * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
117  * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
118  * being used to store jiffies, which are unsigned longs).
119  */
120
121 /*
122  * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
123  * - get rid of check_region
124  * - s/suser/capable/
125  */
126
127 /*
128  * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
129  * floppy controller (lingering task on list after module is gone... boom.)
130  */
131
132 /*
133  * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
134  * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
135  * requires many non-obvious changes in arch dependent code.
136  */
137
138 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
139  * Better audit of register_blkdev.
140  */
141
142 #define FLOPPY_SANITY_CHECK
143 #undef  FLOPPY_SILENT_DCL_CLEAR
144
145 #define REALLY_SLOW_IO
146
147 #define DEBUGT 2
148 #define DCL_DEBUG               /* debug disk change line */
149
150 /* do print messages for unexpected interrupts */
151 static int print_unex = 1;
152 #include <linux/module.h>
153 #include <linux/sched.h>
154 #include <linux/fs.h>
155 #include <linux/kernel.h>
156 #include <linux/timer.h>
157 #include <linux/workqueue.h>
158 #define FDPATCHES
159 #include <linux/fdreg.h>
160
161 /*
162  * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
163  */
164
165 #include <linux/fd.h>
166 #include <linux/hdreg.h>
167
168 #include <linux/errno.h>
169 #include <linux/slab.h>
170 #include <linux/mm.h>
171 #include <linux/bio.h>
172 #include <linux/string.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/devfs_fs_kernel.h>
180 #include <linux/device.h>
181 #include <linux/buffer_head.h>  /* for invalidate_buffers() */
182
183 /*
184  * PS/2 floppies have much slower step rates than regular floppies.
185  * It's been recommended that take about 1/4 of the default speed
186  * in some more extreme cases.
187  */
188 static int slow_floppy;
189
190 #include <asm/dma.h>
191 #include <asm/irq.h>
192 #include <asm/system.h>
193 #include <asm/io.h>
194 #include <asm/uaccess.h>
195
196 static int FLOPPY_IRQ = 6;
197 static int FLOPPY_DMA = 2;
198 static int can_use_virtual_dma = 2;
199 /* =======
200  * can use virtual DMA:
201  * 0 = use of virtual DMA disallowed by config
202  * 1 = use of virtual DMA prescribed by config
203  * 2 = no virtual DMA preference configured.  By default try hard DMA,
204  * but fall back on virtual DMA when not enough memory available
205  */
206
207 static int use_virtual_dma;
208 /* =======
209  * use virtual DMA
210  * 0 using hard DMA
211  * 1 using virtual DMA
212  * This variable is set to virtual when a DMA mem problem arises, and
213  * reset back in floppy_grab_irq_and_dma.
214  * It is not safe to reset it in other circumstances, because the floppy
215  * driver may have several buffers in use at once, and we do currently not
216  * record each buffers capabilities
217  */
218
219 static DEFINE_SPINLOCK(floppy_lock);
220 static struct completion device_release;
221
222 static unsigned short virtual_dma_port = 0x3f0;
223 irqreturn_t floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs);
224 static int set_dor(int fdc, char mask, char data);
225 static void register_devfs_entries(int drive) __init;
226
227 #define K_64    0x10000         /* 64KB */
228
229 /* the following is the mask of allowed drives. By default units 2 and
230  * 3 of both floppy controllers are disabled, because switching on the
231  * motor of these drives causes system hangs on some PCI computers. drive
232  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
233  * a drive is allowed.
234  *
235  * NOTE: This must come before we include the arch floppy header because
236  *       some ports reference this variable from there. -DaveM
237  */
238
239 static int allowed_drive_mask = 0x33;
240
241 #include <asm/floppy.h>
242
243 static int irqdma_allocated;
244
245 #define LOCAL_END_REQUEST
246 #define DEVICE_NAME "floppy"
247
248 #include <linux/blkdev.h>
249 #include <linux/blkpg.h>
250 #include <linux/cdrom.h>        /* for the compatibility eject ioctl */
251 #include <linux/completion.h>
252
253 static struct request *current_req;
254 static struct request_queue *floppy_queue;
255 static void do_fd_request(request_queue_t * q);
256
257 #ifndef fd_get_dma_residue
258 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
259 #endif
260
261 /* Dma Memory related stuff */
262
263 #ifndef fd_dma_mem_free
264 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
265 #endif
266
267 #ifndef fd_dma_mem_alloc
268 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL,get_order(size))
269 #endif
270
271 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
272 {
273 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
274         if (*addr)
275                 return;         /* we have the memory */
276         if (can_use_virtual_dma != 2)
277                 return;         /* no fallback allowed */
278         printk
279             ("DMA memory shortage. Temporarily falling back on virtual DMA\n");
280         *addr = (char *)nodma_mem_alloc(l);
281 #else
282         return;
283 #endif
284 }
285
286 /* End dma memory related stuff */
287
288 static unsigned long fake_change;
289 static int initialising = 1;
290
291 #define ITYPE(x) (((x)>>2) & 0x1f)
292 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
293 #define UNIT(x) ((x) & 0x03)    /* drive on fdc */
294 #define FDC(x) (((x) & 0x04) >> 2)      /* fdc of drive */
295 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
296                                 /* reverse mapping from unit and fdc to drive */
297 #define DP (&drive_params[current_drive])
298 #define DRS (&drive_state[current_drive])
299 #define DRWE (&write_errors[current_drive])
300 #define FDCS (&fdc_state[fdc])
301 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
302 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
303 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
304
305 #define UDP (&drive_params[drive])
306 #define UDRS (&drive_state[drive])
307 #define UDRWE (&write_errors[drive])
308 #define UFDCS (&fdc_state[FDC(drive)])
309 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
310 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
311 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
312
313 #define DPRINT(format, args...) printk(DEVICE_NAME "%d: " format, current_drive , ## args)
314
315 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
316 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
317
318 #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
319
320 /* read/write */
321 #define COMMAND raw_cmd->cmd[0]
322 #define DR_SELECT raw_cmd->cmd[1]
323 #define TRACK raw_cmd->cmd[2]
324 #define HEAD raw_cmd->cmd[3]
325 #define SECTOR raw_cmd->cmd[4]
326 #define SIZECODE raw_cmd->cmd[5]
327 #define SECT_PER_TRACK raw_cmd->cmd[6]
328 #define GAP raw_cmd->cmd[7]
329 #define SIZECODE2 raw_cmd->cmd[8]
330 #define NR_RW 9
331
332 /* format */
333 #define F_SIZECODE raw_cmd->cmd[2]
334 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
335 #define F_GAP raw_cmd->cmd[4]
336 #define F_FILL raw_cmd->cmd[5]
337 #define NR_F 6
338
339 /*
340  * Maximum disk size (in kilobytes). This default is used whenever the
341  * current disk size is unknown.
342  * [Now it is rather a minimum]
343  */
344 #define MAX_DISK_SIZE 4         /* 3984 */
345
346 /*
347  * globals used by 'result()'
348  */
349 #define MAX_REPLIES 16
350 static unsigned char reply_buffer[MAX_REPLIES];
351 static int inr;                 /* size of reply buffer, when called from interrupt */
352 #define ST0 (reply_buffer[0])
353 #define ST1 (reply_buffer[1])
354 #define ST2 (reply_buffer[2])
355 #define ST3 (reply_buffer[0])   /* result of GETSTATUS */
356 #define R_TRACK (reply_buffer[3])
357 #define R_HEAD (reply_buffer[4])
358 #define R_SECTOR (reply_buffer[5])
359 #define R_SIZECODE (reply_buffer[6])
360
361 #define SEL_DLY (2*HZ/100)
362
363 /*
364  * this struct defines the different floppy drive types.
365  */
366 static struct {
367         struct floppy_drive_params params;
368         const char *name;       /* name printed while booting */
369 } default_drive_params[] = {
370 /* NOTE: the time values in jiffies should be in msec!
371  CMOS drive type
372   |     Maximum data rate supported by drive type
373   |     |   Head load time, msec
374   |     |   |   Head unload time, msec (not used)
375   |     |   |   |     Step rate interval, usec
376   |     |   |   |     |       Time needed for spinup time (jiffies)
377   |     |   |   |     |       |      Timeout for spinning down (jiffies)
378   |     |   |   |     |       |      |   Spindown offset (where disk stops)
379   |     |   |   |     |       |      |   |     Select delay
380   |     |   |   |     |       |      |   |     |     RPS
381   |     |   |   |     |       |      |   |     |     |    Max number of tracks
382   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
383   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
384   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
385 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
386       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
387
388 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
389       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
390
391 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
392       0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
393
394 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
395       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
396
397 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
398       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
399
400 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
401       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
402
403 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
404       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
405 /*    |  --autodetected formats---    |      |      |
406  *    read_track                      |      |    Name printed when booting
407  *                                    |     Native format
408  *                  Frequency of disk change checks */
409 };
410
411 static struct floppy_drive_params drive_params[N_DRIVE];
412 static struct floppy_drive_struct drive_state[N_DRIVE];
413 static struct floppy_write_errors write_errors[N_DRIVE];
414 static struct timer_list motor_off_timer[N_DRIVE];
415 static struct gendisk *disks[N_DRIVE];
416 static struct block_device *opened_bdev[N_DRIVE];
417 static DECLARE_MUTEX(open_lock);
418 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
419
420 /*
421  * This struct defines the different floppy types.
422  *
423  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
424  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
425  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
426  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
427  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
428  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
429  * side 0 is on physical side 0 (but with the misnamed sector IDs).
430  * 'stretch' should probably be renamed to something more general, like
431  * 'options'.  Other parameters should be self-explanatory (see also
432  * setfdprm(8)).
433  */
434 /*
435             Size
436              |  Sectors per track
437              |  | Head
438              |  | |  Tracks
439              |  | |  | Stretch
440              |  | |  | |  Gap 1 size
441              |  | |  | |    |  Data rate, | 0x40 for perp
442              |  | |  | |    |    |  Spec1 (stepping rate, head unload
443              |  | |  | |    |    |    |    /fmt gap (gap2) */
444 static struct floppy_struct floppy_type[32] = {
445         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
446         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
447         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
448         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
449         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
450         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
451         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
452         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
453         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
454         { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /*  9 3.12MB 3.5"   */
455
456         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
457         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
458         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
459         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
460         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
461         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
462         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
463         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
464         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
465         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
466
467         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
468         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
469         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
470         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
471         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
472         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
473         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
474         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
475         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
476
477         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
478         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
479         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
480 };
481
482 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
483 #define SECTSIZE (_FD_SECTSIZE(*floppy))
484
485 /* Auto-detection: Disk type used until the next media change occurs. */
486 static struct floppy_struct *current_type[N_DRIVE];
487
488 /*
489  * User-provided type information. current_type points to
490  * the respective entry of this array.
491  */
492 static struct floppy_struct user_params[N_DRIVE];
493
494 static sector_t floppy_sizes[256];
495
496 /*
497  * The driver is trying to determine the correct media format
498  * while probing is set. rw_interrupt() clears it after a
499  * successful access.
500  */
501 static int probing;
502
503 /* Synchronization of FDC access. */
504 #define FD_COMMAND_NONE -1
505 #define FD_COMMAND_ERROR 2
506 #define FD_COMMAND_OKAY 3
507
508 static volatile int command_status = FD_COMMAND_NONE;
509 static unsigned long fdc_busy;
510 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
511 static DECLARE_WAIT_QUEUE_HEAD(command_done);
512
513 #define NO_SIGNAL (!interruptible || !signal_pending(current))
514 #define CALL(x) if ((x) == -EINTR) return -EINTR
515 #define ECALL(x) if ((ret = (x))) return ret;
516 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
517 #define WAIT(x) _WAIT((x),interruptible)
518 #define IWAIT(x) _WAIT((x),1)
519
520 /* Errors during formatting are counted here. */
521 static int format_errors;
522
523 /* Format request descriptor. */
524 static struct format_descr format_req;
525
526 /*
527  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
528  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
529  * H is head unload time (1=16ms, 2=32ms, etc)
530  */
531
532 /*
533  * Track buffer
534  * Because these are written to by the DMA controller, they must
535  * not contain a 64k byte boundary crossing, or data will be
536  * corrupted/lost.
537  */
538 static char *floppy_track_buffer;
539 static int max_buffer_sectors;
540
541 static int *errors;
542 typedef void (*done_f) (int);
543 static struct cont_t {
544         void (*interrupt) (void);       /* this is called after the interrupt of the
545                                          * main command */
546         void (*redo) (void);    /* this is called to retry the operation */
547         void (*error) (void);   /* this is called to tally an error */
548         done_f done;            /* this is called to say if the operation has
549                                  * succeeded/failed */
550 } *cont;
551
552 static void floppy_ready(void);
553 static void floppy_start(void);
554 static void process_fd_request(void);
555 static void recalibrate_floppy(void);
556 static void floppy_shutdown(unsigned long);
557
558 static int floppy_grab_irq_and_dma(void);
559 static void floppy_release_irq_and_dma(void);
560
561 /*
562  * The "reset" variable should be tested whenever an interrupt is scheduled,
563  * after the commands have been sent. This is to ensure that the driver doesn't
564  * get wedged when the interrupt doesn't come because of a failed command.
565  * reset doesn't need to be tested before sending commands, because
566  * output_byte is automatically disabled when reset is set.
567  */
568 #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
569 static void reset_fdc(void);
570
571 /*
572  * These are global variables, as that's the easiest way to give
573  * information to interrupts. They are the data used for the current
574  * request.
575  */
576 #define NO_TRACK -1
577 #define NEED_1_RECAL -2
578 #define NEED_2_RECAL -3
579
580 static int usage_count;
581
582 /* buffer related variables */
583 static int buffer_track = -1;
584 static int buffer_drive = -1;
585 static int buffer_min = -1;
586 static int buffer_max = -1;
587
588 /* fdc related variables, should end up in a struct */
589 static struct floppy_fdc_state fdc_state[N_FDC];
590 static int fdc;                 /* current fdc */
591
592 static struct floppy_struct *_floppy = floppy_type;
593 static unsigned char current_drive;
594 static long current_count_sectors;
595 static unsigned char fsector_t; /* sector in track */
596 static unsigned char in_sector_offset;  /* offset within physical sector,
597                                          * expressed in units of 512 bytes */
598
599 #ifndef fd_eject
600 static inline int fd_eject(int drive)
601 {
602         return -EINVAL;
603 }
604 #endif
605
606 /*
607  * Debugging
608  * =========
609  */
610 #ifdef DEBUGT
611 static long unsigned debugtimer;
612
613 static inline void set_debugt(void)
614 {
615         debugtimer = jiffies;
616 }
617
618 static inline void debugt(const char *message)
619 {
620         if (DP->flags & DEBUGT)
621                 printk("%s dtime=%lu\n", message, jiffies - debugtimer);
622 }
623 #else
624 static inline void set_debugt(void) { }
625 static inline void debugt(const char *message) { }
626 #endif /* DEBUGT */
627
628 typedef void (*timeout_fn) (unsigned long);
629 static struct timer_list fd_timeout = TIMER_INITIALIZER(floppy_shutdown, 0, 0);
630
631 static const char *timeout_message;
632
633 #ifdef FLOPPY_SANITY_CHECK
634 static void is_alive(const char *message)
635 {
636         /* this routine checks whether the floppy driver is "alive" */
637         if (test_bit(0, &fdc_busy) && command_status < 2
638             && !timer_pending(&fd_timeout)) {
639                 DPRINT("timeout handler died: %s\n", message);
640         }
641 }
642 #endif
643
644 static void (*do_floppy) (void) = NULL;
645
646 #ifdef FLOPPY_SANITY_CHECK
647
648 #define OLOGSIZE 20
649
650 static void (*lasthandler) (void);
651 static unsigned long interruptjiffies;
652 static unsigned long resultjiffies;
653 static int resultsize;
654 static unsigned long lastredo;
655
656 static struct output_log {
657         unsigned char data;
658         unsigned char status;
659         unsigned long jiffies;
660 } output_log[OLOGSIZE];
661
662 static int output_log_pos;
663 #endif
664
665 #define current_reqD -1
666 #define MAXTIMEOUT -2
667
668 static void __reschedule_timeout(int drive, const char *message, int marg)
669 {
670         if (drive == current_reqD)
671                 drive = current_drive;
672         del_timer(&fd_timeout);
673         if (drive < 0 || drive > N_DRIVE) {
674                 fd_timeout.expires = jiffies + 20UL * HZ;
675                 drive = 0;
676         } else
677                 fd_timeout.expires = jiffies + UDP->timeout;
678         add_timer(&fd_timeout);
679         if (UDP->flags & FD_DEBUG) {
680                 DPRINT("reschedule timeout ");
681                 printk(message, marg);
682                 printk("\n");
683         }
684         timeout_message = message;
685 }
686
687 static void reschedule_timeout(int drive, const char *message, int marg)
688 {
689         unsigned long flags;
690
691         spin_lock_irqsave(&floppy_lock, flags);
692         __reschedule_timeout(drive, message, marg);
693         spin_unlock_irqrestore(&floppy_lock, flags);
694 }
695
696 #define INFBOUND(a,b) (a)=max_t(int, a, b)
697
698 #define SUPBOUND(a,b) (a)=min_t(int, a, b)
699
700 /*
701  * Bottom half floppy driver.
702  * ==========================
703  *
704  * This part of the file contains the code talking directly to the hardware,
705  * and also the main service loop (seek-configure-spinup-command)
706  */
707
708 /*
709  * disk change.
710  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
711  * and the last_checked date.
712  *
713  * last_checked is the date of the last check which showed 'no disk change'
714  * FD_DISK_CHANGE is set under two conditions:
715  * 1. The floppy has been changed after some i/o to that floppy already
716  *    took place.
717  * 2. No floppy disk is in the drive. This is done in order to ensure that
718  *    requests are quickly flushed in case there is no disk in the drive. It
719  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
720  *    the drive.
721  *
722  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
723  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
724  *  each seek. If a disk is present, the disk change line should also be
725  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
726  *  change line is set, this means either that no disk is in the drive, or
727  *  that it has been removed since the last seek.
728  *
729  * This means that we really have a third possibility too:
730  *  The floppy has been changed after the last seek.
731  */
732
733 static int disk_change(int drive)
734 {
735         int fdc = FDC(drive);
736 #ifdef FLOPPY_SANITY_CHECK
737         if (jiffies - UDRS->select_date < UDP->select_delay)
738                 DPRINT("WARNING disk change called early\n");
739         if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
740             (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
741                 DPRINT("probing disk change on unselected drive\n");
742                 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
743                        (unsigned int)FDCS->dor);
744         }
745 #endif
746
747 #ifdef DCL_DEBUG
748         if (UDP->flags & FD_DEBUG) {
749                 DPRINT("checking disk change line for drive %d\n", drive);
750                 DPRINT("jiffies=%lu\n", jiffies);
751                 DPRINT("disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
752                 DPRINT("flags=%lx\n", UDRS->flags);
753         }
754 #endif
755         if (UDP->flags & FD_BROKEN_DCL)
756                 return UTESTF(FD_DISK_CHANGED);
757         if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
758                 USETF(FD_VERIFY);       /* verify write protection */
759                 if (UDRS->maxblock) {
760                         /* mark it changed */
761                         USETF(FD_DISK_CHANGED);
762                 }
763
764                 /* invalidate its geometry */
765                 if (UDRS->keep_data >= 0) {
766                         if ((UDP->flags & FTD_MSG) &&
767                             current_type[drive] != NULL)
768                                 DPRINT("Disk type is undefined after "
769                                        "disk change\n");
770                         current_type[drive] = NULL;
771                         floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
772                 }
773
774                 /*USETF(FD_DISK_NEWCHANGE); */
775                 return 1;
776         } else {
777                 UDRS->last_checked = jiffies;
778                 UCLEARF(FD_DISK_NEWCHANGE);
779         }
780         return 0;
781 }
782
783 static inline int is_selected(int dor, int unit)
784 {
785         return ((dor & (0x10 << unit)) && (dor & 3) == unit);
786 }
787
788 static int set_dor(int fdc, char mask, char data)
789 {
790         register unsigned char drive, unit, newdor, olddor;
791
792         if (FDCS->address == -1)
793                 return -1;
794
795         olddor = FDCS->dor;
796         newdor = (olddor & mask) | data;
797         if (newdor != olddor) {
798                 unit = olddor & 0x3;
799                 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
800                         drive = REVDRIVE(fdc, unit);
801 #ifdef DCL_DEBUG
802                         if (UDP->flags & FD_DEBUG) {
803                                 DPRINT("calling disk change from set_dor\n");
804                         }
805 #endif
806                         disk_change(drive);
807                 }
808                 FDCS->dor = newdor;
809                 fd_outb(newdor, FD_DOR);
810
811                 unit = newdor & 0x3;
812                 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
813                         drive = REVDRIVE(fdc, unit);
814                         UDRS->select_date = jiffies;
815                 }
816         }
817         /*
818          *      We should propagate failures to grab the resources back
819          *      nicely from here. Actually we ought to rewrite the fd
820          *      driver some day too.
821          */
822         if (newdor & FLOPPY_MOTOR_MASK)
823                 floppy_grab_irq_and_dma();
824         if (olddor & FLOPPY_MOTOR_MASK)
825                 floppy_release_irq_and_dma();
826         return olddor;
827 }
828
829 static void twaddle(void)
830 {
831         if (DP->select_delay)
832                 return;
833         fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
834         fd_outb(FDCS->dor, FD_DOR);
835         DRS->select_date = jiffies;
836 }
837
838 /* reset all driver information about the current fdc. This is needed after
839  * a reset, and after a raw command. */
840 static void reset_fdc_info(int mode)
841 {
842         int drive;
843
844         FDCS->spec1 = FDCS->spec2 = -1;
845         FDCS->need_configure = 1;
846         FDCS->perp_mode = 1;
847         FDCS->rawcmd = 0;
848         for (drive = 0; drive < N_DRIVE; drive++)
849                 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
850                         UDRS->track = NEED_2_RECAL;
851 }
852
853 /* selects the fdc and drive, and enables the fdc's input/dma. */
854 static void set_fdc(int drive)
855 {
856         if (drive >= 0 && drive < N_DRIVE) {
857                 fdc = FDC(drive);
858                 current_drive = drive;
859         }
860         if (fdc != 1 && fdc != 0) {
861                 printk("bad fdc value\n");
862                 return;
863         }
864         set_dor(fdc, ~0, 8);
865 #if N_FDC > 1
866         set_dor(1 - fdc, ~8, 0);
867 #endif
868         if (FDCS->rawcmd == 2)
869                 reset_fdc_info(1);
870         if (fd_inb(FD_STATUS) != STATUS_READY)
871                 FDCS->reset = 1;
872 }
873
874 /* locks the driver */
875 static int _lock_fdc(int drive, int interruptible, int line)
876 {
877         if (!usage_count) {
878                 printk(KERN_ERR
879                        "Trying to lock fdc while usage count=0 at line %d\n",
880                        line);
881                 return -1;
882         }
883         if (floppy_grab_irq_and_dma() == -1)
884                 return -EBUSY;
885
886         if (test_and_set_bit(0, &fdc_busy)) {
887                 DECLARE_WAITQUEUE(wait, current);
888                 add_wait_queue(&fdc_wait, &wait);
889
890                 for (;;) {
891                         set_current_state(TASK_INTERRUPTIBLE);
892
893                         if (!test_and_set_bit(0, &fdc_busy))
894                                 break;
895
896                         schedule();
897
898                         if (!NO_SIGNAL) {
899                                 remove_wait_queue(&fdc_wait, &wait);
900                                 return -EINTR;
901                         }
902                 }
903
904                 set_current_state(TASK_RUNNING);
905                 remove_wait_queue(&fdc_wait, &wait);
906         }
907         command_status = FD_COMMAND_NONE;
908
909         __reschedule_timeout(drive, "lock fdc", 0);
910         set_fdc(drive);
911         return 0;
912 }
913
914 #define lock_fdc(drive,interruptible) _lock_fdc(drive,interruptible, __LINE__)
915
916 #define LOCK_FDC(drive,interruptible) \
917 if (lock_fdc(drive,interruptible)) return -EINTR;
918
919 /* unlocks the driver */
920 static inline void unlock_fdc(void)
921 {
922         unsigned long flags;
923
924         raw_cmd = NULL;
925         if (!test_bit(0, &fdc_busy))
926                 DPRINT("FDC access conflict!\n");
927
928         if (do_floppy)
929                 DPRINT("device interrupt still active at FDC release: %p!\n",
930                        do_floppy);
931         command_status = FD_COMMAND_NONE;
932         spin_lock_irqsave(&floppy_lock, flags);
933         del_timer(&fd_timeout);
934         cont = NULL;
935         clear_bit(0, &fdc_busy);
936         if (elv_next_request(floppy_queue))
937                 do_fd_request(floppy_queue);
938         spin_unlock_irqrestore(&floppy_lock, flags);
939         floppy_release_irq_and_dma();
940         wake_up(&fdc_wait);
941 }
942
943 /* switches the motor off after a given timeout */
944 static void motor_off_callback(unsigned long nr)
945 {
946         unsigned char mask = ~(0x10 << UNIT(nr));
947
948         set_dor(FDC(nr), mask, 0);
949 }
950
951 /* schedules motor off */
952 static void floppy_off(unsigned int drive)
953 {
954         unsigned long volatile delta;
955         register int fdc = FDC(drive);
956
957         if (!(FDCS->dor & (0x10 << UNIT(drive))))
958                 return;
959
960         del_timer(motor_off_timer + drive);
961
962         /* make spindle stop in a position which minimizes spinup time
963          * next time */
964         if (UDP->rps) {
965                 delta = jiffies - UDRS->first_read_date + HZ -
966                     UDP->spindown_offset;
967                 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
968                 motor_off_timer[drive].expires =
969                     jiffies + UDP->spindown - delta;
970         }
971         add_timer(motor_off_timer + drive);
972 }
973
974 /*
975  * cycle through all N_DRIVE floppy drives, for disk change testing.
976  * stopping at current drive. This is done before any long operation, to
977  * be sure to have up to date disk change information.
978  */
979 static void scandrives(void)
980 {
981         int i, drive, saved_drive;
982
983         if (DP->select_delay)
984                 return;
985
986         saved_drive = current_drive;
987         for (i = 0; i < N_DRIVE; i++) {
988                 drive = (saved_drive + i + 1) % N_DRIVE;
989                 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
990                         continue;       /* skip closed drives */
991                 set_fdc(drive);
992                 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
993                       (0x10 << UNIT(drive))))
994                         /* switch the motor off again, if it was off to
995                          * begin with */
996                         set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
997         }
998         set_fdc(saved_drive);
999 }
1000
1001 static void empty(void)
1002 {
1003 }
1004
1005 static DECLARE_WORK(floppy_work, NULL, NULL);
1006
1007 static void schedule_bh(void (*handler) (void))
1008 {
1009         PREPARE_WORK(&floppy_work, (void (*)(void *))handler, NULL);
1010         schedule_work(&floppy_work);
1011 }
1012
1013 static struct timer_list fd_timer = TIMER_INITIALIZER(NULL, 0, 0);
1014
1015 static void cancel_activity(void)
1016 {
1017         unsigned long flags;
1018
1019         spin_lock_irqsave(&floppy_lock, flags);
1020         do_floppy = NULL;
1021         PREPARE_WORK(&floppy_work, (void *)empty, NULL);
1022         del_timer(&fd_timer);
1023         spin_unlock_irqrestore(&floppy_lock, flags);
1024 }
1025
1026 /* this function makes sure that the disk stays in the drive during the
1027  * transfer */
1028 static void fd_watchdog(void)
1029 {
1030 #ifdef DCL_DEBUG
1031         if (DP->flags & FD_DEBUG) {
1032                 DPRINT("calling disk change from watchdog\n");
1033         }
1034 #endif
1035
1036         if (disk_change(current_drive)) {
1037                 DPRINT("disk removed during i/o\n");
1038                 cancel_activity();
1039                 cont->done(0);
1040                 reset_fdc();
1041         } else {
1042                 del_timer(&fd_timer);
1043                 fd_timer.function = (timeout_fn) fd_watchdog;
1044                 fd_timer.expires = jiffies + HZ / 10;
1045                 add_timer(&fd_timer);
1046         }
1047 }
1048
1049 static void main_command_interrupt(void)
1050 {
1051         del_timer(&fd_timer);
1052         cont->interrupt();
1053 }
1054
1055 /* waits for a delay (spinup or select) to pass */
1056 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1057 {
1058         if (FDCS->reset) {
1059                 reset_fdc();    /* do the reset during sleep to win time
1060                                  * if we don't need to sleep, it's a good
1061                                  * occasion anyways */
1062                 return 1;
1063         }
1064
1065         if ((signed)(jiffies - delay) < 0) {
1066                 del_timer(&fd_timer);
1067                 fd_timer.function = function;
1068                 fd_timer.expires = delay;
1069                 add_timer(&fd_timer);
1070                 return 1;
1071         }
1072         return 0;
1073 }
1074
1075 static DEFINE_SPINLOCK(floppy_hlt_lock);
1076 static int hlt_disabled;
1077 static void floppy_disable_hlt(void)
1078 {
1079         unsigned long flags;
1080
1081         spin_lock_irqsave(&floppy_hlt_lock, flags);
1082         if (!hlt_disabled) {
1083                 hlt_disabled = 1;
1084 #ifdef HAVE_DISABLE_HLT
1085                 disable_hlt();
1086 #endif
1087         }
1088         spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1089 }
1090
1091 static void floppy_enable_hlt(void)
1092 {
1093         unsigned long flags;
1094
1095         spin_lock_irqsave(&floppy_hlt_lock, flags);
1096         if (hlt_disabled) {
1097                 hlt_disabled = 0;
1098 #ifdef HAVE_DISABLE_HLT
1099                 enable_hlt();
1100 #endif
1101         }
1102         spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1103 }
1104
1105 static void setup_DMA(void)
1106 {
1107         unsigned long f;
1108
1109 #ifdef FLOPPY_SANITY_CHECK
1110         if (raw_cmd->length == 0) {
1111                 int i;
1112
1113                 printk("zero dma transfer size:");
1114                 for (i = 0; i < raw_cmd->cmd_count; i++)
1115                         printk("%x,", raw_cmd->cmd[i]);
1116                 printk("\n");
1117                 cont->done(0);
1118                 FDCS->reset = 1;
1119                 return;
1120         }
1121         if (((unsigned long)raw_cmd->kernel_data) % 512) {
1122                 printk("non aligned address: %p\n", raw_cmd->kernel_data);
1123                 cont->done(0);
1124                 FDCS->reset = 1;
1125                 return;
1126         }
1127 #endif
1128         f = claim_dma_lock();
1129         fd_disable_dma();
1130 #ifdef fd_dma_setup
1131         if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1132                          (raw_cmd->flags & FD_RAW_READ) ?
1133                          DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1134                 release_dma_lock(f);
1135                 cont->done(0);
1136                 FDCS->reset = 1;
1137                 return;
1138         }
1139         release_dma_lock(f);
1140 #else
1141         fd_clear_dma_ff();
1142         fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1143         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1144                         DMA_MODE_READ : DMA_MODE_WRITE);
1145         fd_set_dma_addr(raw_cmd->kernel_data);
1146         fd_set_dma_count(raw_cmd->length);
1147         virtual_dma_port = FDCS->address;
1148         fd_enable_dma();
1149         release_dma_lock(f);
1150 #endif
1151         floppy_disable_hlt();
1152 }
1153
1154 static void show_floppy(void);
1155
1156 /* waits until the fdc becomes ready */
1157 static int wait_til_ready(void)
1158 {
1159         int counter, status;
1160         if (FDCS->reset)
1161                 return -1;
1162         for (counter = 0; counter < 10000; counter++) {
1163                 status = fd_inb(FD_STATUS);
1164                 if (status & STATUS_READY)
1165                         return status;
1166         }
1167         if (!initialising) {
1168                 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1169                 show_floppy();
1170         }
1171         FDCS->reset = 1;
1172         return -1;
1173 }
1174
1175 /* sends a command byte to the fdc */
1176 static int output_byte(char byte)
1177 {
1178         int status;
1179
1180         if ((status = wait_til_ready()) < 0)
1181                 return -1;
1182         if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY) {
1183                 fd_outb(byte, FD_DATA);
1184 #ifdef FLOPPY_SANITY_CHECK
1185                 output_log[output_log_pos].data = byte;
1186                 output_log[output_log_pos].status = status;
1187                 output_log[output_log_pos].jiffies = jiffies;
1188                 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1189 #endif
1190                 return 0;
1191         }
1192         FDCS->reset = 1;
1193         if (!initialising) {
1194                 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1195                        byte, fdc, status);
1196                 show_floppy();
1197         }
1198         return -1;
1199 }
1200
1201 #define LAST_OUT(x) if (output_byte(x)<0){ reset_fdc();return;}
1202
1203 /* gets the response from the fdc */
1204 static int result(void)
1205 {
1206         int i, status = 0;
1207
1208         for (i = 0; i < MAX_REPLIES; i++) {
1209                 if ((status = wait_til_ready()) < 0)
1210                         break;
1211                 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1212                 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1213 #ifdef FLOPPY_SANITY_CHECK
1214                         resultjiffies = jiffies;
1215                         resultsize = i;
1216 #endif
1217                         return i;
1218                 }
1219                 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1220                         reply_buffer[i] = fd_inb(FD_DATA);
1221                 else
1222                         break;
1223         }
1224         if (!initialising) {
1225                 DPRINT
1226                     ("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1227                      fdc, status, i);
1228                 show_floppy();
1229         }
1230         FDCS->reset = 1;
1231         return -1;
1232 }
1233
1234 #define MORE_OUTPUT -2
1235 /* does the fdc need more output? */
1236 static int need_more_output(void)
1237 {
1238         int status;
1239         if ((status = wait_til_ready()) < 0)
1240                 return -1;
1241         if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY)
1242                 return MORE_OUTPUT;
1243         return result();
1244 }
1245
1246 /* Set perpendicular mode as required, based on data rate, if supported.
1247  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1248  */
1249 static inline void perpendicular_mode(void)
1250 {
1251         unsigned char perp_mode;
1252
1253         if (raw_cmd->rate & 0x40) {
1254                 switch (raw_cmd->rate & 3) {
1255                 case 0:
1256                         perp_mode = 2;
1257                         break;
1258                 case 3:
1259                         perp_mode = 3;
1260                         break;
1261                 default:
1262                         DPRINT("Invalid data rate for perpendicular mode!\n");
1263                         cont->done(0);
1264                         FDCS->reset = 1;        /* convenient way to return to
1265                                                  * redo without to much hassle (deep
1266                                                  * stack et al. */
1267                         return;
1268                 }
1269         } else
1270                 perp_mode = 0;
1271
1272         if (FDCS->perp_mode == perp_mode)
1273                 return;
1274         if (FDCS->version >= FDC_82077_ORIG) {
1275                 output_byte(FD_PERPENDICULAR);
1276                 output_byte(perp_mode);
1277                 FDCS->perp_mode = perp_mode;
1278         } else if (perp_mode) {
1279                 DPRINT("perpendicular mode not supported by this FDC.\n");
1280         }
1281 }                               /* perpendicular_mode */
1282
1283 static int fifo_depth = 0xa;
1284 static int no_fifo;
1285
1286 static int fdc_configure(void)
1287 {
1288         /* Turn on FIFO */
1289         output_byte(FD_CONFIGURE);
1290         if (need_more_output() != MORE_OUTPUT)
1291                 return 0;
1292         output_byte(0);
1293         output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1294         output_byte(0);         /* pre-compensation from track
1295                                    0 upwards */
1296         return 1;
1297 }
1298
1299 #define NOMINAL_DTR 500
1300
1301 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1302  * head load time, and DMA disable flag to values needed by floppy.
1303  *
1304  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1305  * to account for the data rate-based scaling done by the 82072 and 82077
1306  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1307  * 8272a).
1308  *
1309  * Note that changing the data transfer rate has a (probably deleterious)
1310  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1311  * fdc_specify is called again after each data transfer rate
1312  * change.
1313  *
1314  * srt: 1000 to 16000 in microseconds
1315  * hut: 16 to 240 milliseconds
1316  * hlt: 2 to 254 milliseconds
1317  *
1318  * These values are rounded up to the next highest available delay time.
1319  */
1320 static void fdc_specify(void)
1321 {
1322         unsigned char spec1, spec2;
1323         unsigned long srt, hlt, hut;
1324         unsigned long dtr = NOMINAL_DTR;
1325         unsigned long scale_dtr = NOMINAL_DTR;
1326         int hlt_max_code = 0x7f;
1327         int hut_max_code = 0xf;
1328
1329         if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1330                 fdc_configure();
1331                 FDCS->need_configure = 0;
1332                 /*DPRINT("FIFO enabled\n"); */
1333         }
1334
1335         switch (raw_cmd->rate & 0x03) {
1336         case 3:
1337                 dtr = 1000;
1338                 break;
1339         case 1:
1340                 dtr = 300;
1341                 if (FDCS->version >= FDC_82078) {
1342                         /* chose the default rate table, not the one
1343                          * where 1 = 2 Mbps */
1344                         output_byte(FD_DRIVESPEC);
1345                         if (need_more_output() == MORE_OUTPUT) {
1346                                 output_byte(UNIT(current_drive));
1347                                 output_byte(0xc0);
1348                         }
1349                 }
1350                 break;
1351         case 2:
1352                 dtr = 250;
1353                 break;
1354         }
1355
1356         if (FDCS->version >= FDC_82072) {
1357                 scale_dtr = dtr;
1358                 hlt_max_code = 0x00;    /* 0==256msec*dtr0/dtr (not linear!) */
1359                 hut_max_code = 0x0;     /* 0==256msec*dtr0/dtr (not linear!) */
1360         }
1361
1362         /* Convert step rate from microseconds to milliseconds and 4 bits */
1363         srt = 16 - (DP->srt * scale_dtr / 1000 + NOMINAL_DTR - 1) / NOMINAL_DTR;
1364         if (slow_floppy) {
1365                 srt = srt / 4;
1366         }
1367         SUPBOUND(srt, 0xf);
1368         INFBOUND(srt, 0);
1369
1370         hlt = (DP->hlt * scale_dtr / 2 + NOMINAL_DTR - 1) / NOMINAL_DTR;
1371         if (hlt < 0x01)
1372                 hlt = 0x01;
1373         else if (hlt > 0x7f)
1374                 hlt = hlt_max_code;
1375
1376         hut = (DP->hut * scale_dtr / 16 + NOMINAL_DTR - 1) / NOMINAL_DTR;
1377         if (hut < 0x1)
1378                 hut = 0x1;
1379         else if (hut > 0xf)
1380                 hut = hut_max_code;
1381
1382         spec1 = (srt << 4) | hut;
1383         spec2 = (hlt << 1) | (use_virtual_dma & 1);
1384
1385         /* If these parameters did not change, just return with success */
1386         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1387                 /* Go ahead and set spec1 and spec2 */
1388                 output_byte(FD_SPECIFY);
1389                 output_byte(FDCS->spec1 = spec1);
1390                 output_byte(FDCS->spec2 = spec2);
1391         }
1392 }                               /* fdc_specify */
1393
1394 /* Set the FDC's data transfer rate on behalf of the specified drive.
1395  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1396  * of the specify command (i.e. using the fdc_specify function).
1397  */
1398 static int fdc_dtr(void)
1399 {
1400         /* If data rate not already set to desired value, set it. */
1401         if ((raw_cmd->rate & 3) == FDCS->dtr)
1402                 return 0;
1403
1404         /* Set dtr */
1405         fd_outb(raw_cmd->rate & 3, FD_DCR);
1406
1407         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1408          * need a stabilization period of several milliseconds to be
1409          * enforced after data rate changes before R/W operations.
1410          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1411          */
1412         FDCS->dtr = raw_cmd->rate & 3;
1413         return (fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1414                                        (timeout_fn) floppy_ready));
1415 }                               /* fdc_dtr */
1416
1417 static void tell_sector(void)
1418 {
1419         printk(": track %d, head %d, sector %d, size %d",
1420                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1421 }                               /* tell_sector */
1422
1423 /*
1424  * OK, this error interpreting routine is called after a
1425  * DMA read/write has succeeded
1426  * or failed, so we check the results, and copy any buffers.
1427  * hhb: Added better error reporting.
1428  * ak: Made this into a separate routine.
1429  */
1430 static int interpret_errors(void)
1431 {
1432         char bad;
1433
1434         if (inr != 7) {
1435                 DPRINT("-- FDC reply error");
1436                 FDCS->reset = 1;
1437                 return 1;
1438         }
1439
1440         /* check IC to find cause of interrupt */
1441         switch (ST0 & ST0_INTR) {
1442         case 0x40:              /* error occurred during command execution */
1443                 if (ST1 & ST1_EOC)
1444                         return 0;       /* occurs with pseudo-DMA */
1445                 bad = 1;
1446                 if (ST1 & ST1_WP) {
1447                         DPRINT("Drive is write protected\n");
1448                         CLEARF(FD_DISK_WRITABLE);
1449                         cont->done(0);
1450                         bad = 2;
1451                 } else if (ST1 & ST1_ND) {
1452                         SETF(FD_NEED_TWADDLE);
1453                 } else if (ST1 & ST1_OR) {
1454                         if (DP->flags & FTD_MSG)
1455                                 DPRINT("Over/Underrun - retrying\n");
1456                         bad = 0;
1457                 } else if (*errors >= DP->max_errors.reporting) {
1458                         DPRINT("");
1459                         if (ST0 & ST0_ECE) {
1460                                 printk("Recalibrate failed!");
1461                         } else if (ST2 & ST2_CRC) {
1462                                 printk("data CRC error");
1463                                 tell_sector();
1464                         } else if (ST1 & ST1_CRC) {
1465                                 printk("CRC error");
1466                                 tell_sector();
1467                         } else if ((ST1 & (ST1_MAM | ST1_ND))
1468                                    || (ST2 & ST2_MAM)) {
1469                                 if (!probing) {
1470                                         printk("sector not found");
1471                                         tell_sector();
1472                                 } else
1473                                         printk("probe failed...");
1474                         } else if (ST2 & ST2_WC) {      /* seek error */
1475                                 printk("wrong cylinder");
1476                         } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1477                                 printk("bad cylinder");
1478                         } else {
1479                                 printk
1480                                     ("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1481                                      ST0, ST1, ST2);
1482                                 tell_sector();
1483                         }
1484                         printk("\n");
1485
1486                 }
1487                 if (ST2 & ST2_WC || ST2 & ST2_BC)
1488                         /* wrong cylinder => recal */
1489                         DRS->track = NEED_2_RECAL;
1490                 return bad;
1491         case 0x80:              /* invalid command given */
1492                 DPRINT("Invalid FDC command given!\n");
1493                 cont->done(0);
1494                 return 2;
1495         case 0xc0:
1496                 DPRINT("Abnormal termination caused by polling\n");
1497                 cont->error();
1498                 return 2;
1499         default:                /* (0) Normal command termination */
1500                 return 0;
1501         }
1502 }
1503
1504 /*
1505  * This routine is called when everything should be correctly set up
1506  * for the transfer (i.e. floppy motor is on, the correct floppy is
1507  * selected, and the head is sitting on the right track).
1508  */
1509 static void setup_rw_floppy(void)
1510 {
1511         int i, r, flags, dflags;
1512         unsigned long ready_date;
1513         timeout_fn function;
1514
1515         flags = raw_cmd->flags;
1516         if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1517                 flags |= FD_RAW_INTR;
1518
1519         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1520                 ready_date = DRS->spinup_date + DP->spinup;
1521                 /* If spinup will take a long time, rerun scandrives
1522                  * again just before spinup completion. Beware that
1523                  * after scandrives, we must again wait for selection.
1524                  */
1525                 if ((signed)(ready_date - jiffies) > DP->select_delay) {
1526                         ready_date -= DP->select_delay;
1527                         function = (timeout_fn) floppy_start;
1528                 } else
1529                         function = (timeout_fn) setup_rw_floppy;
1530
1531                 /* wait until the floppy is spinning fast enough */
1532                 if (fd_wait_for_completion(ready_date, function))
1533                         return;
1534         }
1535         dflags = DRS->flags;
1536
1537         if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1538                 setup_DMA();
1539
1540         if (flags & FD_RAW_INTR)
1541                 do_floppy = main_command_interrupt;
1542
1543         r = 0;
1544         for (i = 0; i < raw_cmd->cmd_count; i++)
1545                 r |= output_byte(raw_cmd->cmd[i]);
1546
1547         debugt("rw_command: ");
1548
1549         if (r) {
1550                 cont->error();
1551                 reset_fdc();
1552                 return;
1553         }
1554
1555         if (!(flags & FD_RAW_INTR)) {
1556                 inr = result();
1557                 cont->interrupt();
1558         } else if (flags & FD_RAW_NEED_DISK)
1559                 fd_watchdog();
1560 }
1561
1562 static int blind_seek;
1563
1564 /*
1565  * This is the routine called after every seek (or recalibrate) interrupt
1566  * from the floppy controller.
1567  */
1568 static void seek_interrupt(void)
1569 {
1570         debugt("seek interrupt:");
1571         if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1572                 DPRINT("seek failed\n");
1573                 DRS->track = NEED_2_RECAL;
1574                 cont->error();
1575                 cont->redo();
1576                 return;
1577         }
1578         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1579 #ifdef DCL_DEBUG
1580                 if (DP->flags & FD_DEBUG) {
1581                         DPRINT
1582                             ("clearing NEWCHANGE flag because of effective seek\n");
1583                         DPRINT("jiffies=%lu\n", jiffies);
1584                 }
1585 #endif
1586                 CLEARF(FD_DISK_NEWCHANGE);      /* effective seek */
1587                 DRS->select_date = jiffies;
1588         }
1589         DRS->track = ST1;
1590         floppy_ready();
1591 }
1592
1593 static void check_wp(void)
1594 {
1595         if (TESTF(FD_VERIFY)) {
1596                 /* check write protection */
1597                 output_byte(FD_GETSTATUS);
1598                 output_byte(UNIT(current_drive));
1599                 if (result() != 1) {
1600                         FDCS->reset = 1;
1601                         return;
1602                 }
1603                 CLEARF(FD_VERIFY);
1604                 CLEARF(FD_NEED_TWADDLE);
1605 #ifdef DCL_DEBUG
1606                 if (DP->flags & FD_DEBUG) {
1607                         DPRINT("checking whether disk is write protected\n");
1608                         DPRINT("wp=%x\n", ST3 & 0x40);
1609                 }
1610 #endif
1611                 if (!(ST3 & 0x40))
1612                         SETF(FD_DISK_WRITABLE);
1613                 else
1614                         CLEARF(FD_DISK_WRITABLE);
1615         }
1616 }
1617
1618 static void seek_floppy(void)
1619 {
1620         int track;
1621
1622         blind_seek = 0;
1623
1624 #ifdef DCL_DEBUG
1625         if (DP->flags & FD_DEBUG) {
1626                 DPRINT("calling disk change from seek\n");
1627         }
1628 #endif
1629
1630         if (!TESTF(FD_DISK_NEWCHANGE) &&
1631             disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1632                 /* the media changed flag should be cleared after the seek.
1633                  * If it isn't, this means that there is really no disk in
1634                  * the drive.
1635                  */
1636                 SETF(FD_DISK_CHANGED);
1637                 cont->done(0);
1638                 cont->redo();
1639                 return;
1640         }
1641         if (DRS->track <= NEED_1_RECAL) {
1642                 recalibrate_floppy();
1643                 return;
1644         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1645                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1646                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1647                 /* we seek to clear the media-changed condition. Does anybody
1648                  * know a more elegant way, which works on all drives? */
1649                 if (raw_cmd->track)
1650                         track = raw_cmd->track - 1;
1651                 else {
1652                         if (DP->flags & FD_SILENT_DCL_CLEAR) {
1653                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1654                                 blind_seek = 1;
1655                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1656                         }
1657                         track = 1;
1658                 }
1659         } else {
1660                 check_wp();
1661                 if (raw_cmd->track != DRS->track &&
1662                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1663                         track = raw_cmd->track;
1664                 else {
1665                         setup_rw_floppy();
1666                         return;
1667                 }
1668         }
1669
1670         do_floppy = seek_interrupt;
1671         output_byte(FD_SEEK);
1672         output_byte(UNIT(current_drive));
1673         LAST_OUT(track);
1674         debugt("seek command:");
1675 }
1676
1677 static void recal_interrupt(void)
1678 {
1679         debugt("recal interrupt:");
1680         if (inr != 2)
1681                 FDCS->reset = 1;
1682         else if (ST0 & ST0_ECE) {
1683                 switch (DRS->track) {
1684                 case NEED_1_RECAL:
1685                         debugt("recal interrupt need 1 recal:");
1686                         /* after a second recalibrate, we still haven't
1687                          * reached track 0. Probably no drive. Raise an
1688                          * error, as failing immediately might upset
1689                          * computers possessed by the Devil :-) */
1690                         cont->error();
1691                         cont->redo();
1692                         return;
1693                 case NEED_2_RECAL:
1694                         debugt("recal interrupt need 2 recal:");
1695                         /* If we already did a recalibrate,
1696                          * and we are not at track 0, this
1697                          * means we have moved. (The only way
1698                          * not to move at recalibration is to
1699                          * be already at track 0.) Clear the
1700                          * new change flag */
1701 #ifdef DCL_DEBUG
1702                         if (DP->flags & FD_DEBUG) {
1703                                 DPRINT
1704                                     ("clearing NEWCHANGE flag because of second recalibrate\n");
1705                         }
1706 #endif
1707
1708                         CLEARF(FD_DISK_NEWCHANGE);
1709                         DRS->select_date = jiffies;
1710                         /* fall through */
1711                 default:
1712                         debugt("recal interrupt default:");
1713                         /* Recalibrate moves the head by at
1714                          * most 80 steps. If after one
1715                          * recalibrate we don't have reached
1716                          * track 0, this might mean that we
1717                          * started beyond track 80.  Try
1718                          * again.  */
1719                         DRS->track = NEED_1_RECAL;
1720                         break;
1721                 }
1722         } else
1723                 DRS->track = ST1;
1724         floppy_ready();
1725 }
1726
1727 static void print_result(char *message, int inr)
1728 {
1729         int i;
1730
1731         DPRINT("%s ", message);
1732         if (inr >= 0)
1733                 for (i = 0; i < inr; i++)
1734                         printk("repl[%d]=%x ", i, reply_buffer[i]);
1735         printk("\n");
1736 }
1737
1738 /* interrupt handler. Note that this can be called externally on the Sparc */
1739 irqreturn_t floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs)
1740 {
1741         void (*handler) (void) = do_floppy;
1742         int do_print;
1743         unsigned long f;
1744
1745         lasthandler = handler;
1746         interruptjiffies = jiffies;
1747
1748         f = claim_dma_lock();
1749         fd_disable_dma();
1750         release_dma_lock(f);
1751
1752         floppy_enable_hlt();
1753         do_floppy = NULL;
1754         if (fdc >= N_FDC || FDCS->address == -1) {
1755                 /* we don't even know which FDC is the culprit */
1756                 printk("DOR0=%x\n", fdc_state[0].dor);
1757                 printk("floppy interrupt on bizarre fdc %d\n", fdc);
1758                 printk("handler=%p\n", handler);
1759                 is_alive("bizarre fdc");
1760                 return IRQ_NONE;
1761         }
1762
1763         FDCS->reset = 0;
1764         /* We have to clear the reset flag here, because apparently on boxes
1765          * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1766          * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1767          * emission of the SENSEI's.
1768          * It is OK to emit floppy commands because we are in an interrupt
1769          * handler here, and thus we have to fear no interference of other
1770          * activity.
1771          */
1772
1773         do_print = !handler && print_unex && !initialising;
1774
1775         inr = result();
1776         if (do_print)
1777                 print_result("unexpected interrupt", inr);
1778         if (inr == 0) {
1779                 int max_sensei = 4;
1780                 do {
1781                         output_byte(FD_SENSEI);
1782                         inr = result();
1783                         if (do_print)
1784                                 print_result("sensei", inr);
1785                         max_sensei--;
1786                 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2
1787                          && max_sensei);
1788         }
1789         if (!handler) {
1790                 FDCS->reset = 1;
1791                 return IRQ_NONE;
1792         }
1793         schedule_bh(handler);
1794         is_alive("normal interrupt end");
1795
1796         /* FIXME! Was it really for us? */
1797         return IRQ_HANDLED;
1798 }
1799
1800 static void recalibrate_floppy(void)
1801 {
1802         debugt("recalibrate floppy:");
1803         do_floppy = recal_interrupt;
1804         output_byte(FD_RECALIBRATE);
1805         LAST_OUT(UNIT(current_drive));
1806 }
1807
1808 /*
1809  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1810  */
1811 static void reset_interrupt(void)
1812 {
1813         debugt("reset interrupt:");
1814         result();               /* get the status ready for set_fdc */
1815         if (FDCS->reset) {
1816                 printk("reset set in interrupt, calling %p\n", cont->error);
1817                 cont->error();  /* a reset just after a reset. BAD! */
1818         }
1819         cont->redo();
1820 }
1821
1822 /*
1823  * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1824  * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1825  */
1826 static void reset_fdc(void)
1827 {
1828         unsigned long flags;
1829
1830         do_floppy = reset_interrupt;
1831         FDCS->reset = 0;
1832         reset_fdc_info(0);
1833
1834         /* Pseudo-DMA may intercept 'reset finished' interrupt.  */
1835         /* Irrelevant for systems with true DMA (i386).          */
1836
1837         flags = claim_dma_lock();
1838         fd_disable_dma();
1839         release_dma_lock(flags);
1840
1841         if (FDCS->version >= FDC_82072A)
1842                 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1843         else {
1844                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1845                 udelay(FD_RESET_DELAY);
1846                 fd_outb(FDCS->dor, FD_DOR);
1847         }
1848 }
1849
1850 static void show_floppy(void)
1851 {
1852         int i;
1853
1854         printk("\n");
1855         printk("floppy driver state\n");
1856         printk("-------------------\n");
1857         printk("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n",
1858                jiffies, interruptjiffies, jiffies - interruptjiffies,
1859                lasthandler);
1860
1861 #ifdef FLOPPY_SANITY_CHECK
1862         printk("timeout_message=%s\n", timeout_message);
1863         printk("last output bytes:\n");
1864         for (i = 0; i < OLOGSIZE; i++)
1865                 printk("%2x %2x %lu\n",
1866                        output_log[(i + output_log_pos) % OLOGSIZE].data,
1867                        output_log[(i + output_log_pos) % OLOGSIZE].status,
1868                        output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1869         printk("last result at %lu\n", resultjiffies);
1870         printk("last redo_fd_request at %lu\n", lastredo);
1871         for (i = 0; i < resultsize; i++) {
1872                 printk("%2x ", reply_buffer[i]);
1873         }
1874         printk("\n");
1875 #endif
1876
1877         printk("status=%x\n", fd_inb(FD_STATUS));
1878         printk("fdc_busy=%lu\n", fdc_busy);
1879         if (do_floppy)
1880                 printk("do_floppy=%p\n", do_floppy);
1881         if (floppy_work.pending)
1882                 printk("floppy_work.func=%p\n", floppy_work.func);
1883         if (timer_pending(&fd_timer))
1884                 printk("fd_timer.function=%p\n", fd_timer.function);
1885         if (timer_pending(&fd_timeout)) {
1886                 printk("timer_function=%p\n", fd_timeout.function);
1887                 printk("expires=%lu\n", fd_timeout.expires - jiffies);
1888                 printk("now=%lu\n", jiffies);
1889         }
1890         printk("cont=%p\n", cont);
1891         printk("current_req=%p\n", current_req);
1892         printk("command_status=%d\n", command_status);
1893         printk("\n");
1894 }
1895
1896 static void floppy_shutdown(unsigned long data)
1897 {
1898         unsigned long flags;
1899
1900         if (!initialising)
1901                 show_floppy();
1902         cancel_activity();
1903
1904         floppy_enable_hlt();
1905
1906         flags = claim_dma_lock();
1907         fd_disable_dma();
1908         release_dma_lock(flags);
1909
1910         /* avoid dma going to a random drive after shutdown */
1911
1912         if (!initialising)
1913                 DPRINT("floppy timeout called\n");
1914         FDCS->reset = 1;
1915         if (cont) {
1916                 cont->done(0);
1917                 cont->redo();   /* this will recall reset when needed */
1918         } else {
1919                 printk("no cont in shutdown!\n");
1920                 process_fd_request();
1921         }
1922         is_alive("floppy shutdown");
1923 }
1924
1925 /*typedef void (*timeout_fn)(unsigned long);*/
1926
1927 /* start motor, check media-changed condition and write protection */
1928 static int start_motor(void (*function) (void))
1929 {
1930         int mask, data;
1931
1932         mask = 0xfc;
1933         data = UNIT(current_drive);
1934         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1935                 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1936                         set_debugt();
1937                         /* no read since this drive is running */
1938                         DRS->first_read_date = 0;
1939                         /* note motor start time if motor is not yet running */
1940                         DRS->spinup_date = jiffies;
1941                         data |= (0x10 << UNIT(current_drive));
1942                 }
1943         } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1944                 mask &= ~(0x10 << UNIT(current_drive));
1945
1946         /* starts motor and selects floppy */
1947         del_timer(motor_off_timer + current_drive);
1948         set_dor(fdc, mask, data);
1949
1950         /* wait_for_completion also schedules reset if needed. */
1951         return (fd_wait_for_completion(DRS->select_date + DP->select_delay,
1952                                        (timeout_fn) function));
1953 }
1954
1955 static void floppy_ready(void)
1956 {
1957         CHECK_RESET;
1958         if (start_motor(floppy_ready))
1959                 return;
1960         if (fdc_dtr())
1961                 return;
1962
1963 #ifdef DCL_DEBUG
1964         if (DP->flags & FD_DEBUG) {
1965                 DPRINT("calling disk change from floppy_ready\n");
1966         }
1967 #endif
1968         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1969             disk_change(current_drive) && !DP->select_delay)
1970                 twaddle();      /* this clears the dcl on certain drive/controller
1971                                  * combinations */
1972
1973 #ifdef fd_chose_dma_mode
1974         if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1975                 unsigned long flags = claim_dma_lock();
1976                 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1977                 release_dma_lock(flags);
1978         }
1979 #endif
1980
1981         if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1982                 perpendicular_mode();
1983                 fdc_specify();  /* must be done here because of hut, hlt ... */
1984                 seek_floppy();
1985         } else {
1986                 if ((raw_cmd->flags & FD_RAW_READ) ||
1987                     (raw_cmd->flags & FD_RAW_WRITE))
1988                         fdc_specify();
1989                 setup_rw_floppy();
1990         }
1991 }
1992
1993 static void floppy_start(void)
1994 {
1995         reschedule_timeout(current_reqD, "floppy start", 0);
1996
1997         scandrives();
1998 #ifdef DCL_DEBUG
1999         if (DP->flags & FD_DEBUG) {
2000                 DPRINT("setting NEWCHANGE in floppy_start\n");
2001         }
2002 #endif
2003         SETF(FD_DISK_NEWCHANGE);
2004         floppy_ready();
2005 }
2006
2007 /*
2008  * ========================================================================
2009  * here ends the bottom half. Exported routines are:
2010  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
2011  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
2012  * Initialization also uses output_byte, result, set_dor, floppy_interrupt
2013  * and set_dor.
2014  * ========================================================================
2015  */
2016 /*
2017  * General purpose continuations.
2018  * ==============================
2019  */
2020
2021 static void do_wakeup(void)
2022 {
2023         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
2024         cont = NULL;
2025         command_status += 2;
2026         wake_up(&command_done);
2027 }
2028
2029 static struct cont_t wakeup_cont = {
2030         .interrupt      = empty,
2031         .redo           = do_wakeup,
2032         .error          = empty,
2033         .done           = (done_f) empty
2034 };
2035
2036 static struct cont_t intr_cont = {
2037         .interrupt      = empty,
2038         .redo           = process_fd_request,
2039         .error          = empty,
2040         .done           = (done_f) empty
2041 };
2042
2043 static int wait_til_done(void (*handler) (void), int interruptible)
2044 {
2045         int ret;
2046
2047         schedule_bh(handler);
2048
2049         if (command_status < 2 && NO_SIGNAL) {
2050                 DECLARE_WAITQUEUE(wait, current);
2051
2052                 add_wait_queue(&command_done, &wait);
2053                 for (;;) {
2054                         set_current_state(interruptible ?
2055                                           TASK_INTERRUPTIBLE :
2056                                           TASK_UNINTERRUPTIBLE);
2057
2058                         if (command_status >= 2 || !NO_SIGNAL)
2059                                 break;
2060
2061                         is_alive("wait_til_done");
2062
2063                         schedule();
2064                 }
2065
2066                 set_current_state(TASK_RUNNING);
2067                 remove_wait_queue(&command_done, &wait);
2068         }
2069
2070         if (command_status < 2) {
2071                 cancel_activity();
2072                 cont = &intr_cont;
2073                 reset_fdc();
2074                 return -EINTR;
2075         }
2076
2077         if (FDCS->reset)
2078                 command_status = FD_COMMAND_ERROR;
2079         if (command_status == FD_COMMAND_OKAY)
2080                 ret = 0;
2081         else
2082                 ret = -EIO;
2083         command_status = FD_COMMAND_NONE;
2084         return ret;
2085 }
2086
2087 static void generic_done(int result)
2088 {
2089         command_status = result;
2090         cont = &wakeup_cont;
2091 }
2092
2093 static void generic_success(void)
2094 {
2095         cont->done(1);
2096 }
2097
2098 static void generic_failure(void)
2099 {
2100         cont->done(0);
2101 }
2102
2103 static void success_and_wakeup(void)
2104 {
2105         generic_success();
2106         cont->redo();
2107 }
2108
2109 /*
2110  * formatting and rw support.
2111  * ==========================
2112  */
2113
2114 static int next_valid_format(void)
2115 {
2116         int probed_format;
2117
2118         probed_format = DRS->probed_format;
2119         while (1) {
2120                 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2121                         DRS->probed_format = 0;
2122                         return 1;
2123                 }
2124                 if (floppy_type[DP->autodetect[probed_format]].sect) {
2125                         DRS->probed_format = probed_format;
2126                         return 0;
2127                 }
2128                 probed_format++;
2129         }
2130 }
2131
2132 static void bad_flp_intr(void)
2133 {
2134         int err_count;
2135
2136         if (probing) {
2137                 DRS->probed_format++;
2138                 if (!next_valid_format())
2139                         return;
2140         }
2141         err_count = ++(*errors);
2142         INFBOUND(DRWE->badness, err_count);
2143         if (err_count > DP->max_errors.abort)
2144                 cont->done(0);
2145         if (err_count > DP->max_errors.reset)
2146                 FDCS->reset = 1;
2147         else if (err_count > DP->max_errors.recal)
2148                 DRS->track = NEED_2_RECAL;
2149 }
2150
2151 static void set_floppy(int drive)
2152 {
2153         int type = ITYPE(UDRS->fd_device);
2154         if (type)
2155                 _floppy = floppy_type + type;
2156         else
2157                 _floppy = current_type[drive];
2158 }
2159
2160 /*
2161  * formatting support.
2162  * ===================
2163  */
2164 static void format_interrupt(void)
2165 {
2166         switch (interpret_errors()) {
2167         case 1:
2168                 cont->error();
2169         case 2:
2170                 break;
2171         case 0:
2172                 cont->done(1);
2173         }
2174         cont->redo();
2175 }
2176
2177 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
2178 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
2179 #define CT(x) ((x) | 0xc0)
2180 static void setup_format_params(int track)
2181 {
2182         struct fparm {
2183                 unsigned char track, head, sect, size;
2184         } *here = (struct fparm *)floppy_track_buffer;
2185         int il, n;
2186         int count, head_shift, track_shift;
2187
2188         raw_cmd = &default_raw_cmd;
2189         raw_cmd->track = track;
2190
2191         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2192             FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2193         raw_cmd->rate = _floppy->rate & 0x43;
2194         raw_cmd->cmd_count = NR_F;
2195         COMMAND = FM_MODE(_floppy, FD_FORMAT);
2196         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2197         F_SIZECODE = FD_SIZECODE(_floppy);
2198         F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2199         F_GAP = _floppy->fmt_gap;
2200         F_FILL = FD_FILL_BYTE;
2201
2202         raw_cmd->kernel_data = floppy_track_buffer;
2203         raw_cmd->length = 4 * F_SECT_PER_TRACK;
2204
2205         /* allow for about 30ms for data transport per track */
2206         head_shift = (F_SECT_PER_TRACK + 5) / 6;
2207
2208         /* a ``cylinder'' is two tracks plus a little stepping time */
2209         track_shift = 2 * head_shift + 3;
2210
2211         /* position of logical sector 1 on this track */
2212         n = (track_shift * format_req.track + head_shift * format_req.head)
2213             % F_SECT_PER_TRACK;
2214
2215         /* determine interleave */
2216         il = 1;
2217         if (_floppy->fmt_gap < 0x22)
2218                 il++;
2219
2220         /* initialize field */
2221         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2222                 here[count].track = format_req.track;
2223                 here[count].head = format_req.head;
2224                 here[count].sect = 0;
2225                 here[count].size = F_SIZECODE;
2226         }
2227         /* place logical sectors */
2228         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2229                 here[n].sect = count;
2230                 n = (n + il) % F_SECT_PER_TRACK;
2231                 if (here[n].sect) {     /* sector busy, find next free sector */
2232                         ++n;
2233                         if (n >= F_SECT_PER_TRACK) {
2234                                 n -= F_SECT_PER_TRACK;
2235                                 while (here[n].sect)
2236                                         ++n;
2237                         }
2238                 }
2239         }
2240         if (_floppy->stretch & FD_ZEROBASED) {
2241                 for (count = 0; count < F_SECT_PER_TRACK; count++)
2242                         here[count].sect--;
2243         }
2244 }
2245
2246 static void redo_format(void)
2247 {
2248         buffer_track = -1;
2249         setup_format_params(format_req.track << STRETCH(_floppy));
2250         floppy_start();
2251         debugt("queue format request");
2252 }
2253
2254 static struct cont_t format_cont = {
2255         .interrupt      = format_interrupt,
2256         .redo           = redo_format,
2257         .error          = bad_flp_intr,
2258         .done           = generic_done
2259 };
2260
2261 static int do_format(int drive, struct format_descr *tmp_format_req)
2262 {
2263         int ret;
2264
2265         LOCK_FDC(drive, 1);
2266         set_floppy(drive);
2267         if (!_floppy ||
2268             _floppy->track > DP->tracks ||
2269             tmp_format_req->track >= _floppy->track ||
2270             tmp_format_req->head >= _floppy->head ||
2271             (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2272             !_floppy->fmt_gap) {
2273                 process_fd_request();
2274                 return -EINVAL;
2275         }
2276         format_req = *tmp_format_req;
2277         format_errors = 0;
2278         cont = &format_cont;
2279         errors = &format_errors;
2280         IWAIT(redo_format);
2281         process_fd_request();
2282         return ret;
2283 }
2284
2285 /*
2286  * Buffer read/write and support
2287  * =============================
2288  */
2289
2290 static void floppy_end_request(struct request *req, int uptodate)
2291 {
2292         unsigned int nr_sectors = current_count_sectors;
2293
2294         /* current_count_sectors can be zero if transfer failed */
2295         if (!uptodate)
2296                 nr_sectors = req->current_nr_sectors;
2297         if (end_that_request_first(req, uptodate, nr_sectors))
2298                 return;
2299         add_disk_randomness(req->rq_disk);
2300         floppy_off((long)req->rq_disk->private_data);
2301         blkdev_dequeue_request(req);
2302         end_that_request_last(req);
2303
2304         /* We're done with the request */
2305         current_req = NULL;
2306 }
2307
2308 /* new request_done. Can handle physical sectors which are smaller than a
2309  * logical buffer */
2310 static void request_done(int uptodate)
2311 {
2312         struct request_queue *q = floppy_queue;
2313         struct request *req = current_req;
2314         unsigned long flags;
2315         int block;
2316
2317         probing = 0;
2318         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2319
2320         if (!req) {
2321                 printk("floppy.c: no request in request_done\n");
2322                 return;
2323         }
2324
2325         if (uptodate) {
2326                 /* maintain values for invalidation on geometry
2327                  * change */
2328                 block = current_count_sectors + req->sector;
2329                 INFBOUND(DRS->maxblock, block);
2330                 if (block > _floppy->sect)
2331                         DRS->maxtrack = 1;
2332
2333                 /* unlock chained buffers */
2334                 spin_lock_irqsave(q->queue_lock, flags);
2335                 floppy_end_request(req, 1);
2336                 spin_unlock_irqrestore(q->queue_lock, flags);
2337         } else {
2338                 if (rq_data_dir(req) == WRITE) {
2339                         /* record write error information */
2340                         DRWE->write_errors++;
2341                         if (DRWE->write_errors == 1) {
2342                                 DRWE->first_error_sector = req->sector;
2343                                 DRWE->first_error_generation = DRS->generation;
2344                         }
2345                         DRWE->last_error_sector = req->sector;
2346                         DRWE->last_error_generation = DRS->generation;
2347                 }
2348                 spin_lock_irqsave(q->queue_lock, flags);
2349                 floppy_end_request(req, 0);
2350                 spin_unlock_irqrestore(q->queue_lock, flags);
2351         }
2352 }
2353
2354 /* Interrupt handler evaluating the result of the r/w operation */
2355 static void rw_interrupt(void)
2356 {
2357         int nr_sectors, ssize, eoc, heads;
2358
2359         if (R_HEAD >= 2) {
2360                 /* some Toshiba floppy controllers occasionnally seem to
2361                  * return bogus interrupts after read/write operations, which
2362                  * can be recognized by a bad head number (>= 2) */
2363                 return;
2364         }
2365
2366         if (!DRS->first_read_date)
2367                 DRS->first_read_date = jiffies;
2368
2369         nr_sectors = 0;
2370         CODE2SIZE;
2371
2372         if (ST1 & ST1_EOC)
2373                 eoc = 1;
2374         else
2375                 eoc = 0;
2376
2377         if (COMMAND & 0x80)
2378                 heads = 2;
2379         else
2380                 heads = 1;
2381
2382         nr_sectors = (((R_TRACK - TRACK) * heads +
2383                        R_HEAD - HEAD) * SECT_PER_TRACK +
2384                       R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2385
2386 #ifdef FLOPPY_SANITY_CHECK
2387         if (nr_sectors / ssize >
2388             (in_sector_offset + current_count_sectors + ssize - 1) / ssize) {
2389                 DPRINT("long rw: %x instead of %lx\n",
2390                        nr_sectors, current_count_sectors);
2391                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2392                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2393                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2394                 printk("heads=%d eoc=%d\n", heads, eoc);
2395                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2396                        fsector_t, ssize);
2397                 printk("in_sector_offset=%d\n", in_sector_offset);
2398         }
2399 #endif
2400
2401         nr_sectors -= in_sector_offset;
2402         INFBOUND(nr_sectors, 0);
2403         SUPBOUND(current_count_sectors, nr_sectors);
2404
2405         switch (interpret_errors()) {
2406         case 2:
2407                 cont->redo();
2408                 return;
2409         case 1:
2410                 if (!current_count_sectors) {
2411                         cont->error();
2412                         cont->redo();
2413                         return;
2414                 }
2415                 break;
2416         case 0:
2417                 if (!current_count_sectors) {
2418                         cont->redo();
2419                         return;
2420                 }
2421                 current_type[current_drive] = _floppy;
2422                 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2423                 break;
2424         }
2425
2426         if (probing) {
2427                 if (DP->flags & FTD_MSG)
2428                         DPRINT("Auto-detected floppy type %s in fd%d\n",
2429                                _floppy->name, current_drive);
2430                 current_type[current_drive] = _floppy;
2431                 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2432                 probing = 0;
2433         }
2434
2435         if (CT(COMMAND) != FD_READ ||
2436             raw_cmd->kernel_data == current_req->buffer) {
2437                 /* transfer directly from buffer */
2438                 cont->done(1);
2439         } else if (CT(COMMAND) == FD_READ) {
2440                 buffer_track = raw_cmd->track;
2441                 buffer_drive = current_drive;
2442                 INFBOUND(buffer_max, nr_sectors + fsector_t);
2443         }
2444         cont->redo();
2445 }
2446
2447 /* Compute maximal contiguous buffer size. */
2448 static int buffer_chain_size(void)
2449 {
2450         struct bio *bio;
2451         struct bio_vec *bv;
2452         int size, i;
2453         char *base;
2454
2455         base = bio_data(current_req->bio);
2456         size = 0;
2457
2458         rq_for_each_bio(bio, current_req) {
2459                 bio_for_each_segment(bv, bio, i) {
2460                         if (page_address(bv->bv_page) + bv->bv_offset !=
2461                             base + size)
2462                                 break;
2463
2464                         size += bv->bv_len;
2465                 }
2466         }
2467
2468         return size >> 9;
2469 }
2470
2471 /* Compute the maximal transfer size */
2472 static int transfer_size(int ssize, int max_sector, int max_size)
2473 {
2474         SUPBOUND(max_sector, fsector_t + max_size);
2475
2476         /* alignment */
2477         max_sector -= (max_sector % _floppy->sect) % ssize;
2478
2479         /* transfer size, beginning not aligned */
2480         current_count_sectors = max_sector - fsector_t;
2481
2482         return max_sector;
2483 }
2484
2485 /*
2486  * Move data from/to the track buffer to/from the buffer cache.
2487  */
2488 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2489 {
2490         int remaining;          /* number of transferred 512-byte sectors */
2491         struct bio_vec *bv;
2492         struct bio *bio;
2493         char *buffer, *dma_buffer;
2494         int size, i;
2495
2496         max_sector = transfer_size(ssize,
2497                                    min(max_sector, max_sector_2),
2498                                    current_req->nr_sectors);
2499
2500         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2501             buffer_max > fsector_t + current_req->nr_sectors)
2502                 current_count_sectors = min_t(int, buffer_max - fsector_t,
2503                                               current_req->nr_sectors);
2504
2505         remaining = current_count_sectors << 9;
2506 #ifdef FLOPPY_SANITY_CHECK
2507         if ((remaining >> 9) > current_req->nr_sectors &&
2508             CT(COMMAND) == FD_WRITE) {
2509                 DPRINT("in copy buffer\n");
2510                 printk("current_count_sectors=%ld\n", current_count_sectors);
2511                 printk("remaining=%d\n", remaining >> 9);
2512                 printk("current_req->nr_sectors=%ld\n",
2513                        current_req->nr_sectors);
2514                 printk("current_req->current_nr_sectors=%u\n",
2515                        current_req->current_nr_sectors);
2516                 printk("max_sector=%d\n", max_sector);
2517                 printk("ssize=%d\n", ssize);
2518         }
2519 #endif
2520
2521         buffer_max = max(max_sector, buffer_max);
2522
2523         dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2524
2525         size = current_req->current_nr_sectors << 9;
2526
2527         rq_for_each_bio(bio, current_req) {
2528                 bio_for_each_segment(bv, bio, i) {
2529                         if (!remaining)
2530                                 break;
2531
2532                         size = bv->bv_len;
2533                         SUPBOUND(size, remaining);
2534
2535                         buffer = page_address(bv->bv_page) + bv->bv_offset;
2536 #ifdef FLOPPY_SANITY_CHECK
2537                         if (dma_buffer + size >
2538                             floppy_track_buffer + (max_buffer_sectors << 10) ||
2539                             dma_buffer < floppy_track_buffer) {
2540                                 DPRINT("buffer overrun in copy buffer %d\n",
2541                                        (int)((floppy_track_buffer -
2542                                               dma_buffer) >> 9));
2543                                 printk("fsector_t=%d buffer_min=%d\n",
2544                                        fsector_t, buffer_min);
2545                                 printk("current_count_sectors=%ld\n",
2546                                        current_count_sectors);
2547                                 if (CT(COMMAND) == FD_READ)
2548                                         printk("read\n");
2549                                 if (CT(COMMAND) == FD_WRITE)
2550                                         printk("write\n");
2551                                 break;
2552                         }
2553                         if (((unsigned long)buffer) % 512)
2554                                 DPRINT("%p buffer not aligned\n", buffer);
2555 #endif
2556                         if (CT(COMMAND) == FD_READ)
2557                                 memcpy(buffer, dma_buffer, size);
2558                         else
2559                                 memcpy(dma_buffer, buffer, size);
2560
2561                         remaining -= size;
2562                         dma_buffer += size;
2563                 }
2564         }
2565 #ifdef FLOPPY_SANITY_CHECK
2566         if (remaining) {
2567                 if (remaining > 0)
2568                         max_sector -= remaining >> 9;
2569                 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2570         }
2571 #endif
2572 }
2573
2574 #if 0
2575 static inline int check_dma_crossing(char *start,
2576                                      unsigned long length, char *message)
2577 {
2578         if (CROSS_64KB(start, length)) {
2579                 printk("DMA xfer crosses 64KB boundary in %s %p-%p\n",
2580                        message, start, start + length);
2581                 return 1;
2582         } else
2583                 return 0;
2584 }
2585 #endif
2586
2587 /* work around a bug in pseudo DMA
2588  * (on some FDCs) pseudo DMA does not stop when the CPU stops
2589  * sending data.  Hence we need a different way to signal the
2590  * transfer length:  We use SECT_PER_TRACK.  Unfortunately, this
2591  * does not work with MT, hence we can only transfer one head at
2592  * a time
2593  */
2594 static void virtualdmabug_workaround(void)
2595 {
2596         int hard_sectors, end_sector;
2597
2598         if (CT(COMMAND) == FD_WRITE) {
2599                 COMMAND &= ~0x80;       /* switch off multiple track mode */
2600
2601                 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2602                 end_sector = SECTOR + hard_sectors - 1;
2603 #ifdef FLOPPY_SANITY_CHECK
2604                 if (end_sector > SECT_PER_TRACK) {
2605                         printk("too many sectors %d > %d\n",
2606                                end_sector, SECT_PER_TRACK);
2607                         return;
2608                 }
2609 #endif
2610                 SECT_PER_TRACK = end_sector;    /* make sure SECT_PER_TRACK points
2611                                                  * to end of transfer */
2612         }
2613 }
2614
2615 /*
2616  * Formulate a read/write request.
2617  * this routine decides where to load the data (directly to buffer, or to
2618  * tmp floppy area), how much data to load (the size of the buffer, the whole
2619  * track, or a single sector)
2620  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2621  * allocation on the fly, it should be done here. No other part should need
2622  * modification.
2623  */
2624
2625 static int make_raw_rw_request(void)
2626 {
2627         int aligned_sector_t;
2628         int max_sector, max_size, tracksize, ssize;
2629
2630         if (max_buffer_sectors == 0) {
2631                 printk("VFS: Block I/O scheduled on unopened device\n");
2632                 return 0;
2633         }
2634
2635         set_fdc((long)current_req->rq_disk->private_data);
2636
2637         raw_cmd = &default_raw_cmd;
2638         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2639             FD_RAW_NEED_SEEK;
2640         raw_cmd->cmd_count = NR_RW;
2641         if (rq_data_dir(current_req) == READ) {
2642                 raw_cmd->flags |= FD_RAW_READ;
2643                 COMMAND = FM_MODE(_floppy, FD_READ);
2644         } else if (rq_data_dir(current_req) == WRITE) {
2645                 raw_cmd->flags |= FD_RAW_WRITE;
2646                 COMMAND = FM_MODE(_floppy, FD_WRITE);
2647         } else {
2648                 DPRINT("make_raw_rw_request: unknown command\n");
2649                 return 0;
2650         }
2651
2652         max_sector = _floppy->sect * _floppy->head;
2653
2654         TRACK = (int)current_req->sector / max_sector;
2655         fsector_t = (int)current_req->sector % max_sector;
2656         if (_floppy->track && TRACK >= _floppy->track) {
2657                 if (current_req->current_nr_sectors & 1) {
2658                         current_count_sectors = 1;
2659                         return 1;
2660                 } else
2661                         return 0;
2662         }
2663         HEAD = fsector_t / _floppy->sect;
2664
2665         if (((_floppy->stretch & (FD_SWAPSIDES | FD_ZEROBASED)) ||
2666              TESTF(FD_NEED_TWADDLE)) && fsector_t < _floppy->sect)
2667                 max_sector = _floppy->sect;
2668
2669         /* 2M disks have phantom sectors on the first track */
2670         if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2671                 max_sector = 2 * _floppy->sect / 3;
2672                 if (fsector_t >= max_sector) {
2673                         current_count_sectors =
2674                             min_t(int, _floppy->sect - fsector_t,
2675                                   current_req->nr_sectors);
2676                         return 1;
2677                 }
2678                 SIZECODE = 2;
2679         } else
2680                 SIZECODE = FD_SIZECODE(_floppy);
2681         raw_cmd->rate = _floppy->rate & 0x43;
2682         if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2683                 raw_cmd->rate = 1;
2684
2685         if (SIZECODE)
2686                 SIZECODE2 = 0xff;
2687         else
2688                 SIZECODE2 = 0x80;
2689         raw_cmd->track = TRACK << STRETCH(_floppy);
2690         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2691         GAP = _floppy->gap;
2692         CODE2SIZE;
2693         SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2694         SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2695             ((_floppy->stretch & FD_ZEROBASED) ? 0 : 1);
2696
2697         /* tracksize describes the size which can be filled up with sectors
2698          * of size ssize.
2699          */
2700         tracksize = _floppy->sect - _floppy->sect % ssize;
2701         if (tracksize < _floppy->sect) {
2702                 SECT_PER_TRACK++;
2703                 if (tracksize <= fsector_t % _floppy->sect)
2704                         SECTOR--;
2705
2706                 /* if we are beyond tracksize, fill up using smaller sectors */
2707                 while (tracksize <= fsector_t % _floppy->sect) {
2708                         while (tracksize + ssize > _floppy->sect) {
2709                                 SIZECODE--;
2710                                 ssize >>= 1;
2711                         }
2712                         SECTOR++;
2713                         SECT_PER_TRACK++;
2714                         tracksize += ssize;
2715                 }
2716                 max_sector = HEAD * _floppy->sect + tracksize;
2717         } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2718                 max_sector = _floppy->sect;
2719         } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2720                 /* for virtual DMA bug workaround */
2721                 max_sector = _floppy->sect;
2722         }
2723
2724         in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2725         aligned_sector_t = fsector_t - in_sector_offset;
2726         max_size = current_req->nr_sectors;
2727         if ((raw_cmd->track == buffer_track) &&
2728             (current_drive == buffer_drive) &&
2729             (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2730                 /* data already in track buffer */
2731                 if (CT(COMMAND) == FD_READ) {
2732                         copy_buffer(1, max_sector, buffer_max);
2733                         return 1;
2734                 }
2735         } else if (in_sector_offset || current_req->nr_sectors < ssize) {
2736                 if (CT(COMMAND) == FD_WRITE) {
2737                         if (fsector_t + current_req->nr_sectors > ssize &&
2738                             fsector_t + current_req->nr_sectors < ssize + ssize)
2739                                 max_size = ssize + ssize;
2740                         else
2741                                 max_size = ssize;
2742                 }
2743                 raw_cmd->flags &= ~FD_RAW_WRITE;
2744                 raw_cmd->flags |= FD_RAW_READ;
2745                 COMMAND = FM_MODE(_floppy, FD_READ);
2746         } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2747                 unsigned long dma_limit;
2748                 int direct, indirect;
2749
2750                 indirect =
2751                     transfer_size(ssize, max_sector,
2752                                   max_buffer_sectors * 2) - fsector_t;
2753
2754                 /*
2755                  * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2756                  * on a 64 bit machine!
2757                  */
2758                 max_size = buffer_chain_size();
2759                 dma_limit =
2760                     (MAX_DMA_ADDRESS -
2761                      ((unsigned long)current_req->buffer)) >> 9;
2762                 if ((unsigned long)max_size > dma_limit) {
2763                         max_size = dma_limit;
2764                 }
2765                 /* 64 kb boundaries */
2766                 if (CROSS_64KB(current_req->buffer, max_size << 9))
2767                         max_size = (K_64 -
2768                                     ((unsigned long)current_req->buffer) %
2769                                     K_64) >> 9;
2770                 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2771                 /*
2772                  * We try to read tracks, but if we get too many errors, we
2773                  * go back to reading just one sector at a time.
2774                  *
2775                  * This means we should be able to read a sector even if there
2776                  * are other bad sectors on this track.
2777                  */
2778                 if (!direct ||
2779                     (indirect * 2 > direct * 3 &&
2780                      *errors < DP->max_errors.read_track &&
2781                      /*!TESTF(FD_NEED_TWADDLE) && */
2782                      ((!probing
2783                        || (DP->read_track & (1 << DRS->probed_format)))))) {
2784                         max_size = current_req->nr_sectors;
2785                 } else {
2786                         raw_cmd->kernel_data = current_req->buffer;
2787                         raw_cmd->length = current_count_sectors << 9;
2788                         if (raw_cmd->length == 0) {
2789                                 DPRINT
2790                                     ("zero dma transfer attempted from make_raw_request\n");
2791                                 DPRINT("indirect=%d direct=%d fsector_t=%d",
2792                                        indirect, direct, fsector_t);
2793                                 return 0;
2794                         }
2795 /*                      check_dma_crossing(raw_cmd->kernel_data, 
2796                                            raw_cmd->length, 
2797                                            "end of make_raw_request [1]");*/
2798
2799                         virtualdmabug_workaround();
2800                         return 2;
2801                 }
2802         }
2803
2804         if (CT(COMMAND) == FD_READ)
2805                 max_size = max_sector;  /* unbounded */
2806
2807         /* claim buffer track if needed */
2808         if (buffer_track != raw_cmd->track ||   /* bad track */
2809             buffer_drive != current_drive ||    /* bad drive */
2810             fsector_t > buffer_max ||
2811             fsector_t < buffer_min ||
2812             ((CT(COMMAND) == FD_READ ||
2813               (!in_sector_offset && current_req->nr_sectors >= ssize)) &&
2814              max_sector > 2 * max_buffer_sectors + buffer_min &&
2815              max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)
2816             /* not enough space */
2817             ) {
2818                 buffer_track = -1;
2819                 buffer_drive = current_drive;
2820                 buffer_max = buffer_min = aligned_sector_t;
2821         }
2822         raw_cmd->kernel_data = floppy_track_buffer +
2823             ((aligned_sector_t - buffer_min) << 9);
2824
2825         if (CT(COMMAND) == FD_WRITE) {
2826                 /* copy write buffer to track buffer.
2827                  * if we get here, we know that the write
2828                  * is either aligned or the data already in the buffer
2829                  * (buffer will be overwritten) */
2830 #ifdef FLOPPY_SANITY_CHECK
2831                 if (in_sector_offset && buffer_track == -1)
2832                         DPRINT("internal error offset !=0 on write\n");
2833 #endif
2834                 buffer_track = raw_cmd->track;
2835                 buffer_drive = current_drive;
2836                 copy_buffer(ssize, max_sector,
2837                             2 * max_buffer_sectors + buffer_min);
2838         } else
2839                 transfer_size(ssize, max_sector,
2840                               2 * max_buffer_sectors + buffer_min -
2841                               aligned_sector_t);
2842
2843         /* round up current_count_sectors to get dma xfer size */
2844         raw_cmd->length = in_sector_offset + current_count_sectors;
2845         raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2846         raw_cmd->length <<= 9;
2847 #ifdef FLOPPY_SANITY_CHECK
2848         /*check_dma_crossing(raw_cmd->kernel_data, raw_cmd->length, 
2849            "end of make_raw_request"); */
2850         if ((raw_cmd->length < current_count_sectors << 9) ||
2851             (raw_cmd->kernel_data != current_req->buffer &&
2852              CT(COMMAND) == FD_WRITE &&
2853              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2854               aligned_sector_t < buffer_min)) ||
2855             raw_cmd->length % (128 << SIZECODE) ||
2856             raw_cmd->length <= 0 || current_count_sectors <= 0) {
2857                 DPRINT("fractionary current count b=%lx s=%lx\n",
2858                        raw_cmd->length, current_count_sectors);
2859                 if (raw_cmd->kernel_data != current_req->buffer)
2860                         printk("addr=%d, length=%ld\n",
2861                                (int)((raw_cmd->kernel_data -
2862                                       floppy_track_buffer) >> 9),
2863                                current_count_sectors);
2864                 printk("st=%d ast=%d mse=%d msi=%d\n",
2865                        fsector_t, aligned_sector_t, max_sector, max_size);
2866                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2867                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2868                        COMMAND, SECTOR, HEAD, TRACK);
2869                 printk("buffer drive=%d\n", buffer_drive);
2870                 printk("buffer track=%d\n", buffer_track);
2871                 printk("buffer_min=%d\n", buffer_min);
2872                 printk("buffer_max=%d\n", buffer_max);
2873                 return 0;
2874         }
2875
2876         if (raw_cmd->kernel_data != current_req->buffer) {
2877                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2878                     current_count_sectors < 0 ||
2879                     raw_cmd->length < 0 ||
2880                     raw_cmd->kernel_data + raw_cmd->length >
2881                     floppy_track_buffer + (max_buffer_sectors << 10)) {
2882                         DPRINT("buffer overrun in schedule dma\n");
2883                         printk("fsector_t=%d buffer_min=%d current_count=%ld\n",
2884                                fsector_t, buffer_min, raw_cmd->length >> 9);
2885                         printk("current_count_sectors=%ld\n",
2886                                current_count_sectors);
2887                         if (CT(COMMAND) == FD_READ)
2888                                 printk("read\n");
2889                         if (CT(COMMAND) == FD_WRITE)
2890                                 printk("write\n");
2891                         return 0;
2892                 }
2893         } else if (raw_cmd->length > current_req->nr_sectors << 9 ||
2894                    current_count_sectors > current_req->nr_sectors) {
2895                 DPRINT("buffer overrun in direct transfer\n");
2896                 return 0;
2897         } else if (raw_cmd->length < current_count_sectors << 9) {
2898                 DPRINT("more sectors than bytes\n");
2899                 printk("bytes=%ld\n", raw_cmd->length >> 9);
2900                 printk("sectors=%ld\n", current_count_sectors);
2901         }
2902         if (raw_cmd->length == 0) {
2903                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2904                 return 0;
2905         }
2906 #endif
2907
2908         virtualdmabug_workaround();
2909         return 2;
2910 }
2911
2912 static void redo_fd_request(void)
2913 {
2914 #define REPEAT {request_done(0); continue; }
2915         int drive;
2916         int tmp;
2917
2918         lastredo = jiffies;
2919         if (current_drive < N_DRIVE)
2920                 floppy_off(current_drive);
2921
2922         for (;;) {
2923                 if (!current_req) {
2924                         struct request *req;
2925
2926                         spin_lock_irq(floppy_queue->queue_lock);
2927                         req = elv_next_request(floppy_queue);
2928                         spin_unlock_irq(floppy_queue->queue_lock);
2929                         if (!req) {
2930                                 do_floppy = NULL;
2931                                 unlock_fdc();
2932                                 return;
2933                         }
2934                         current_req = req;
2935                 }
2936                 drive = (long)current_req->rq_disk->private_data;
2937                 set_fdc(drive);
2938                 reschedule_timeout(current_reqD, "redo fd request", 0);
2939
2940                 set_floppy(drive);
2941                 raw_cmd = &default_raw_cmd;
2942                 raw_cmd->flags = 0;
2943                 if (start_motor(redo_fd_request))
2944                         return;
2945                 disk_change(current_drive);
2946                 if (test_bit(current_drive, &fake_change) ||
2947                     TESTF(FD_DISK_CHANGED)) {
2948                         DPRINT("disk absent or changed during operation\n");
2949                         REPEAT;
2950                 }
2951                 if (!_floppy) { /* Autodetection */
2952                         if (!probing) {
2953                                 DRS->probed_format = 0;
2954                                 if (next_valid_format()) {
2955                                         DPRINT("no autodetectable formats\n");
2956                                         _floppy = NULL;
2957                                         REPEAT;
2958                                 }
2959                         }
2960                         probing = 1;
2961                         _floppy =
2962                             floppy_type + DP->autodetect[DRS->probed_format];
2963                 } else
2964                         probing = 0;
2965                 errors = &(current_req->errors);
2966                 tmp = make_raw_rw_request();
2967                 if (tmp < 2) {
2968                         request_done(tmp);
2969                         continue;
2970                 }
2971
2972                 if (TESTF(FD_NEED_TWADDLE))
2973                         twaddle();
2974                 schedule_bh(floppy_start);
2975                 debugt("queue fd request");
2976                 return;
2977         }
2978 #undef REPEAT
2979 }
2980
2981 static struct cont_t rw_cont = {
2982         .interrupt      = rw_interrupt,
2983         .redo           = redo_fd_request,
2984         .error          = bad_flp_intr,
2985         .done           = request_done
2986 };
2987
2988 static void process_fd_request(void)
2989 {
2990         cont = &rw_cont;
2991         schedule_bh(redo_fd_request);
2992 }
2993
2994 static void do_fd_request(request_queue_t * q)
2995 {
2996         if (max_buffer_sectors == 0) {
2997                 printk("VFS: do_fd_request called on non-open device\n");
2998                 return;
2999         }
3000
3001         if (usage_count == 0) {
3002                 printk("warning: usage count=0, current_req=%p exiting\n",
3003                        current_req);
3004                 printk("sect=%ld flags=%lx\n", (long)current_req->sector,
3005                        current_req->flags);
3006                 return;
3007         }
3008         if (test_bit(0, &fdc_busy)) {
3009                 /* fdc busy, this new request will be treated when the
3010                    current one is done */
3011                 is_alive("do fd request, old request running");
3012                 return;
3013         }
3014         lock_fdc(MAXTIMEOUT, 0);
3015         process_fd_request();
3016         is_alive("do fd request");
3017 }
3018
3019 static struct cont_t poll_cont = {
3020         .interrupt      = success_and_wakeup,
3021         .redo           = floppy_ready,
3022         .error          = generic_failure,
3023         .done           = generic_done
3024 };
3025
3026 static int poll_drive(int interruptible, int flag)
3027 {
3028         int ret;
3029         /* no auto-sense, just clear dcl */
3030         raw_cmd = &default_raw_cmd;
3031         raw_cmd->flags = flag;
3032         raw_cmd->track = 0;
3033         raw_cmd->cmd_count = 0;
3034         cont = &poll_cont;
3035 #ifdef DCL_DEBUG
3036         if (DP->flags & FD_DEBUG) {
3037                 DPRINT("setting NEWCHANGE in poll_drive\n");
3038         }
3039 #endif
3040         SETF(FD_DISK_NEWCHANGE);
3041         WAIT(floppy_ready);
3042         return ret;
3043 }
3044
3045 /*
3046  * User triggered reset
3047  * ====================
3048  */
3049
3050 static void reset_intr(void)
3051 {
3052         printk("weird, reset interrupt called\n");
3053 }
3054
3055 static struct cont_t reset_cont = {
3056         .interrupt      = reset_intr,
3057         .redo           = success_and_wakeup,
3058         .error          = generic_failure,
3059         .done           = generic_done
3060 };
3061
3062 static int user_reset_fdc(int drive, int arg, int interruptible)
3063 {
3064         int ret;
3065
3066         ret = 0;
3067         LOCK_FDC(drive, interruptible);
3068         if (arg == FD_RESET_ALWAYS)
3069                 FDCS->reset = 1;
3070         if (FDCS->reset) {
3071                 cont = &reset_cont;
3072                 WAIT(reset_fdc);
3073         }
3074         process_fd_request();
3075         return ret;
3076 }
3077
3078 /*
3079  * Misc Ioctl's and support
3080  * ========================
3081  */
3082 static inline int fd_copyout(void __user *param, const void *address,
3083                              unsigned long size)
3084 {
3085         return copy_to_user(param, address, size) ? -EFAULT : 0;
3086 }
3087
3088 static inline int fd_copyin(void __user *param, void *address, unsigned long size)
3089 {
3090         return copy_from_user(address, param, size) ? -EFAULT : 0;
3091 }
3092
3093 #define _COPYOUT(x) (copy_to_user((void __user *)param, &(x), sizeof(x)) ? -EFAULT : 0)
3094 #define _COPYIN(x) (copy_from_user(&(x), (void __user *)param, sizeof(x)) ? -EFAULT : 0)
3095
3096 #define COPYOUT(x) ECALL(_COPYOUT(x))
3097 #define COPYIN(x) ECALL(_COPYIN(x))
3098
3099 static inline const char *drive_name(int type, int drive)
3100 {
3101         struct floppy_struct *floppy;
3102
3103         if (type)
3104                 floppy = floppy_type + type;
3105         else {
3106                 if (UDP->native_format)
3107                         floppy = floppy_type + UDP->native_format;
3108                 else
3109                         return "(null)";
3110         }
3111         if (floppy->name)
3112                 return floppy->name;
3113         else
3114                 return "(null)";
3115 }
3116
3117 /* raw commands */
3118 static void raw_cmd_done(int flag)
3119 {
3120         int i;
3121
3122         if (!flag) {
3123                 raw_cmd->flags |= FD_RAW_FAILURE;
3124                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3125         } else {
3126                 raw_cmd->reply_count = inr;
3127                 if (raw_cmd->reply_count > MAX_REPLIES)
3128                         raw_cmd->reply_count = 0;
3129                 for (i = 0; i < raw_cmd->reply_count; i++)
3130                         raw_cmd->reply[i] = reply_buffer[i];
3131
3132                 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3133                         unsigned long flags;
3134                         flags = claim_dma_lock();
3135                         raw_cmd->length = fd_get_dma_residue();
3136                         release_dma_lock(flags);
3137                 }
3138
3139                 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3140                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3141                         raw_cmd->flags |= FD_RAW_FAILURE;
3142
3143                 if (disk_change(current_drive))
3144                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3145                 else
3146                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3147                 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3148                         motor_off_callback(current_drive);
3149
3150                 if (raw_cmd->next &&
3151                     (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3152                      !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3153                     ((raw_cmd->flags & FD_RAW_FAILURE) ||
3154                      !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3155                         raw_cmd = raw_cmd->next;
3156                         return;
3157                 }
3158         }
3159         generic_done(flag);
3160 }
3161
3162 static struct cont_t raw_cmd_cont = {
3163         .interrupt      = success_and_wakeup,
3164         .redo           = floppy_start,
3165         .error          = generic_failure,
3166         .done           = raw_cmd_done
3167 };
3168
3169 static inline int raw_cmd_copyout(int cmd, char __user *param,
3170                                   struct floppy_raw_cmd *ptr)
3171 {
3172         int ret;
3173
3174         while (ptr) {
3175                 COPYOUT(*ptr);
3176                 param += sizeof(struct floppy_raw_cmd);
3177                 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3178                         if (ptr->length >= 0
3179                             && ptr->length <= ptr->buffer_length)
3180                                 ECALL(fd_copyout
3181                                       (ptr->data, ptr->kernel_data,
3182                                        ptr->buffer_length - ptr->length));
3183                 }
3184                 ptr = ptr->next;
3185         }
3186         return 0;
3187 }
3188
3189 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3190 {
3191         struct floppy_raw_cmd *next, *this;
3192
3193         this = *ptr;
3194         *ptr = NULL;
3195         while (this) {
3196                 if (this->buffer_length) {
3197                         fd_dma_mem_free((unsigned long)this->kernel_data,
3198                                         this->buffer_length);
3199                         this->buffer_length = 0;
3200                 }
3201                 next = this->next;
3202                 kfree(this);
3203                 this = next;
3204         }
3205 }
3206
3207 static inline int raw_cmd_copyin(int cmd, char __user *param,
3208                                  struct floppy_raw_cmd **rcmd)
3209 {
3210         struct floppy_raw_cmd *ptr;
3211         int ret;
3212         int i;
3213
3214         *rcmd = NULL;
3215         while (1) {
3216                 ptr = (struct floppy_raw_cmd *)
3217                     kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3218                 if (!ptr)
3219                         return -ENOMEM;
3220                 *rcmd = ptr;
3221                 COPYIN(*ptr);
3222                 ptr->next = NULL;
3223                 ptr->buffer_length = 0;
3224                 param += sizeof(struct floppy_raw_cmd);
3225                 if (ptr->cmd_count > 33)
3226                         /* the command may now also take up the space
3227                          * initially intended for the reply & the
3228                          * reply count. Needed for long 82078 commands
3229                          * such as RESTORE, which takes ... 17 command
3230                          * bytes. Murphy's law #137: When you reserve
3231                          * 16 bytes for a structure, you'll one day
3232                          * discover that you really need 17...
3233                          */
3234                         return -EINVAL;
3235
3236                 for (i = 0; i < 16; i++)
3237                         ptr->reply[i] = 0;
3238                 ptr->resultcode = 0;
3239                 ptr->kernel_data = NULL;
3240
3241                 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3242                         if (ptr->length <= 0)
3243                                 return -EINVAL;
3244                         ptr->kernel_data =
3245                             (char *)fd_dma_mem_alloc(ptr->length);
3246                         fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3247                         if (!ptr->kernel_data)
3248                                 return -ENOMEM;
3249                         ptr->buffer_length = ptr->length;
3250                 }
3251                 if (ptr->flags & FD_RAW_WRITE)
3252                         ECALL(fd_copyin(ptr->data, ptr->kernel_data,
3253                                         ptr->length));
3254                 rcmd = &(ptr->next);
3255                 if (!(ptr->flags & FD_RAW_MORE))
3256                         return 0;
3257                 ptr->rate &= 0x43;
3258         }
3259 }
3260
3261 static int raw_cmd_ioctl(int cmd, void __user *param)
3262 {
3263         int drive, ret, ret2;
3264         struct floppy_raw_cmd *my_raw_cmd;
3265
3266         if (FDCS->rawcmd <= 1)
3267                 FDCS->rawcmd = 1;
3268         for (drive = 0; drive < N_DRIVE; drive++) {
3269                 if (FDC(drive) != fdc)
3270                         continue;
3271                 if (drive == current_drive) {
3272                         if (UDRS->fd_ref > 1) {
3273                                 FDCS->rawcmd = 2;
3274                                 break;
3275                         }
3276                 } else if (UDRS->fd_ref) {
3277                         FDCS->rawcmd = 2;
3278                         break;
3279                 }
3280         }
3281
3282         if (FDCS->reset)
3283                 return -EIO;
3284
3285         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3286         if (ret) {
3287                 raw_cmd_free(&my_raw_cmd);
3288                 return ret;
3289         }
3290
3291         raw_cmd = my_raw_cmd;
3292         cont = &raw_cmd_cont;
3293         ret = wait_til_done(floppy_start, 1);
3294 #ifdef DCL_DEBUG
3295         if (DP->flags & FD_DEBUG) {
3296                 DPRINT("calling disk change from raw_cmd ioctl\n");
3297         }
3298 #endif
3299
3300         if (ret != -EINTR && FDCS->reset)
3301                 ret = -EIO;
3302
3303         DRS->track = NO_TRACK;
3304
3305         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3306         if (!ret)
3307                 ret = ret2;
3308         raw_cmd_free(&my_raw_cmd);
3309         return ret;
3310 }
3311
3312 static int invalidate_drive(struct block_device *bdev)
3313 {
3314         /* invalidate the buffer track to force a reread */
3315         set_bit((long)bdev->bd_disk->private_data, &fake_change);
3316         process_fd_request();
3317         check_disk_change(bdev);
3318         return 0;
3319 }
3320
3321 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
3322                                int drive, int type, struct block_device *bdev)
3323 {
3324         int cnt;
3325