2 * linux/drivers/block/floppy.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1993, 1994 Alain Knaff
6 * Copyright (C) 1998 Alan Cox
10 * 02.12.91 - Changed to static variables to indicate need for reset
11 * and recalibrate. This makes some things easier (output_byte reset
12 * checking etc), and means less interrupt jumping in case of errors,
13 * so the code is hopefully easier to understand.
17 * This file is certainly a mess. I've tried my best to get it working,
18 * but I don't like programming floppies, and I have only one anyway.
19 * Urgel. I should check for more errors, and do more graceful error
20 * recovery. Seems there are problems with several drives. I've tried to
21 * correct them. No promises.
25 * As with hd.c, all routines within this file can (and will) be called
26 * by interrupts, so extreme caution is needed. A hardware interrupt
27 * handler may not sleep, or a kernel panic will happen. Thus I cannot
28 * call "floppy-on" directly, but have to set a special timer interrupt
33 * 28.02.92 - made track-buffering routines, based on the routines written
34 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
38 * Automatic floppy-detection and formatting written by Werner Almesberger
39 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
40 * the floppy-change signal detection.
44 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
45 * FDC data overrun bug, added some preliminary stuff for vertical
48 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
50 * TODO: Errors are still not counted properly.
54 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
55 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
56 * Christoph H. Hochst\"atter.
57 * I have fixed the shift values to the ones I always use. Maybe a new
58 * ioctl() should be created to be able to modify them.
59 * There is a bug in the driver that makes it impossible to format a
60 * floppy as the first thing after bootup.
64 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
65 * this helped the floppy driver as well. Much cleaner, and still seems to
69 /* 1994/6/24 --bbroad-- added the floppy table entries and made
70 * minor modifications to allow 2.88 floppies to be run.
73 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
78 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
79 * format bug fixes, but unfortunately some new bugs too...
82 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
83 * errors to allow safe writing by specialized programs.
86 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
87 * by defining bit 1 of the "stretch" parameter to mean put sectors on the
88 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
89 * drives are "upside-down").
93 * 1995/8/26 -- Andreas Busse -- added Mips support.
97 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
98 * features to asm/floppy.h.
102 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
106 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
107 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
108 * use of '0' for NULL.
112 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
117 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
121 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
122 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
123 * being used to store jiffies, which are unsigned longs).
127 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
128 * - get rid of check_region
133 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
134 * floppy controller (lingering task on list after module is gone... boom.)
138 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
139 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
140 * requires many non-obvious changes in arch dependent code.
143 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
144 * Better audit of register_blkdev.
147 #undef FLOPPY_SILENT_DCL_CLEAR
149 #define REALLY_SLOW_IO
153 #define DPRINT(format, args...) \
154 pr_info("floppy%d: " format, current_drive, ##args)
156 #define DCL_DEBUG /* debug disk change line */
158 #define debug_dcl(test, fmt, args...) \
159 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
161 #define debug_dcl(test, fmt, args...) \
162 do { if (0) DPRINT(fmt, ##args); } while (0)
165 /* do print messages for unexpected interrupts */
166 static int print_unex = 1;
167 #include <linux/module.h>
168 #include <linux/sched.h>
169 #include <linux/fs.h>
170 #include <linux/kernel.h>
171 #include <linux/timer.h>
172 #include <linux/workqueue.h>
174 #include <linux/fdreg.h>
175 #include <linux/fd.h>
176 #include <linux/hdreg.h>
177 #include <linux/errno.h>
178 #include <linux/slab.h>
179 #include <linux/mm.h>
180 #include <linux/bio.h>
181 #include <linux/string.h>
182 #include <linux/jiffies.h>
183 #include <linux/fcntl.h>
184 #include <linux/delay.h>
185 #include <linux/mc146818rtc.h> /* CMOS defines */
186 #include <linux/ioport.h>
187 #include <linux/interrupt.h>
188 #include <linux/init.h>
189 #include <linux/platform_device.h>
190 #include <linux/mod_devicetable.h>
191 #include <linux/mutex.h>
192 #include <linux/io.h>
193 #include <linux/uaccess.h>
194 #include <linux/async.h>
195 #include <linux/compat.h>
198 * PS/2 floppies have much slower step rates than regular floppies.
199 * It's been recommended that take about 1/4 of the default speed
200 * in some more extreme cases.
202 static DEFINE_MUTEX(floppy_mutex);
203 static int slow_floppy;
208 static int FLOPPY_IRQ = 6;
209 static int FLOPPY_DMA = 2;
210 static int can_use_virtual_dma = 2;
212 * can use virtual DMA:
213 * 0 = use of virtual DMA disallowed by config
214 * 1 = use of virtual DMA prescribed by config
215 * 2 = no virtual DMA preference configured. By default try hard DMA,
216 * but fall back on virtual DMA when not enough memory available
219 static int use_virtual_dma;
223 * 1 using virtual DMA
224 * This variable is set to virtual when a DMA mem problem arises, and
225 * reset back in floppy_grab_irq_and_dma.
226 * It is not safe to reset it in other circumstances, because the floppy
227 * driver may have several buffers in use at once, and we do currently not
228 * record each buffers capabilities
231 static DEFINE_SPINLOCK(floppy_lock);
233 static unsigned short virtual_dma_port = 0x3f0;
234 irqreturn_t floppy_interrupt(int irq, void *dev_id);
235 static int set_dor(int fdc, char mask, char data);
237 #define K_64 0x10000 /* 64KB */
239 /* the following is the mask of allowed drives. By default units 2 and
240 * 3 of both floppy controllers are disabled, because switching on the
241 * motor of these drives causes system hangs on some PCI computers. drive
242 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
243 * a drive is allowed.
245 * NOTE: This must come before we include the arch floppy header because
246 * some ports reference this variable from there. -DaveM
249 static int allowed_drive_mask = 0x33;
251 #include <asm/floppy.h>
253 static int irqdma_allocated;
255 #include <linux/blkdev.h>
256 #include <linux/blkpg.h>
257 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
258 #include <linux/completion.h>
260 static struct request *current_req;
261 static void do_fd_request(struct request_queue *q);
262 static int set_next_request(void);
264 #ifndef fd_get_dma_residue
265 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
268 /* Dma Memory related stuff */
270 #ifndef fd_dma_mem_free
271 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
274 #ifndef fd_dma_mem_alloc
275 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
278 #ifndef fd_cacheflush
279 #define fd_cacheflush(addr, size) /* nothing... */
282 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
284 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
286 return; /* we have the memory */
287 if (can_use_virtual_dma != 2)
288 return; /* no fallback allowed */
289 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
290 *addr = (char *)nodma_mem_alloc(l);
296 /* End dma memory related stuff */
298 static unsigned long fake_change;
299 static bool initialized;
301 #define ITYPE(x) (((x) >> 2) & 0x1f)
302 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
303 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
304 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
305 /* reverse mapping from unit and fdc to drive */
306 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
308 #define DP (&drive_params[current_drive])
309 #define DRS (&drive_state[current_drive])
310 #define DRWE (&write_errors[current_drive])
311 #define FDCS (&fdc_state[fdc])
313 #define UDP (&drive_params[drive])
314 #define UDRS (&drive_state[drive])
315 #define UDRWE (&write_errors[drive])
316 #define UFDCS (&fdc_state[FDC(drive)])
318 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
319 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
322 #define COMMAND (raw_cmd->cmd[0])
323 #define DR_SELECT (raw_cmd->cmd[1])
324 #define TRACK (raw_cmd->cmd[2])
325 #define HEAD (raw_cmd->cmd[3])
326 #define SECTOR (raw_cmd->cmd[4])
327 #define SIZECODE (raw_cmd->cmd[5])
328 #define SECT_PER_TRACK (raw_cmd->cmd[6])
329 #define GAP (raw_cmd->cmd[7])
330 #define SIZECODE2 (raw_cmd->cmd[8])
334 #define F_SIZECODE (raw_cmd->cmd[2])
335 #define F_SECT_PER_TRACK (raw_cmd->cmd[3])
336 #define F_GAP (raw_cmd->cmd[4])
337 #define F_FILL (raw_cmd->cmd[5])
341 * Maximum disk size (in kilobytes).
342 * This default is used whenever the current disk size is unknown.
343 * [Now it is rather a minimum]
345 #define MAX_DISK_SIZE 4 /* 3984 */
348 * globals used by 'result()'
350 #define MAX_REPLIES 16
351 static unsigned char reply_buffer[MAX_REPLIES];
352 static int inr; /* size of reply buffer, when called from interrupt */
353 #define ST0 (reply_buffer[0])
354 #define ST1 (reply_buffer[1])
355 #define ST2 (reply_buffer[2])
356 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
357 #define R_TRACK (reply_buffer[3])
358 #define R_HEAD (reply_buffer[4])
359 #define R_SECTOR (reply_buffer[5])
360 #define R_SIZECODE (reply_buffer[6])
362 #define SEL_DLY (2 * HZ / 100)
365 * this struct defines the different floppy drive types.
368 struct floppy_drive_params params;
369 const char *name; /* name printed while booting */
370 } default_drive_params[] = {
371 /* NOTE: the time values in jiffies should be in msec!
373 | Maximum data rate supported by drive type
374 | | Head load time, msec
375 | | | Head unload time, msec (not used)
376 | | | | Step rate interval, usec
377 | | | | | Time needed for spinup time (jiffies)
378 | | | | | | Timeout for spinning down (jiffies)
379 | | | | | | | Spindown offset (where disk stops)
380 | | | | | | | | Select delay
381 | | | | | | | | | RPS
382 | | | | | | | | | | Max number of tracks
383 | | | | | | | | | | | Interrupt timeout
384 | | | | | | | | | | | | Max nonintlv. sectors
385 | | | | | | | | | | | | | -Max Errors- flags */
386 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
387 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
389 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
390 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
392 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
393 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
395 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
396 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
398 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
399 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
401 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
402 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
404 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
405 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
406 /* | --autodetected formats--- | | |
407 * read_track | | Name printed when booting
409 * Frequency of disk change checks */
412 static struct floppy_drive_params drive_params[N_DRIVE];
413 static struct floppy_drive_struct drive_state[N_DRIVE];
414 static struct floppy_write_errors write_errors[N_DRIVE];
415 static struct timer_list motor_off_timer[N_DRIVE];
416 static struct gendisk *disks[N_DRIVE];
417 static struct block_device *opened_bdev[N_DRIVE];
418 static DEFINE_MUTEX(open_lock);
419 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
420 static int fdc_queue;
423 * This struct defines the different floppy types.
425 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
426 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
427 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
428 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
429 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
430 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
431 * side 0 is on physical side 0 (but with the misnamed sector IDs).
432 * 'stretch' should probably be renamed to something more general, like
435 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
436 * The LSB (bit 2) is flipped. For most disks, the first sector
437 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
438 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
439 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
441 * Other parameters should be self-explanatory (see also setfdprm(8)).
450 | | | | | | Data rate, | 0x40 for perp
451 | | | | | | | Spec1 (stepping rate, head unload
452 | | | | | | | | /fmt gap (gap2) */
453 static struct floppy_struct floppy_type[32] = {
454 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
455 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
456 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
457 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
458 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
459 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
460 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
461 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
462 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
463 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
465 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
466 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
467 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
468 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
469 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
470 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
471 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
472 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
473 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
474 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
476 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
477 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
478 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
479 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
480 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
481 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
482 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
483 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
484 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
485 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
487 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
488 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
491 #define SECTSIZE (_FD_SECTSIZE(*floppy))
493 /* Auto-detection: Disk type used until the next media change occurs. */
494 static struct floppy_struct *current_type[N_DRIVE];
497 * User-provided type information. current_type points to
498 * the respective entry of this array.
500 static struct floppy_struct user_params[N_DRIVE];
502 static sector_t floppy_sizes[256];
504 static char floppy_device_name[] = "floppy";
507 * The driver is trying to determine the correct media format
508 * while probing is set. rw_interrupt() clears it after a
513 /* Synchronization of FDC access. */
514 #define FD_COMMAND_NONE -1
515 #define FD_COMMAND_ERROR 2
516 #define FD_COMMAND_OKAY 3
518 static volatile int command_status = FD_COMMAND_NONE;
519 static unsigned long fdc_busy;
520 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
521 static DECLARE_WAIT_QUEUE_HEAD(command_done);
523 /* Errors during formatting are counted here. */
524 static int format_errors;
526 /* Format request descriptor. */
527 static struct format_descr format_req;
530 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
531 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
532 * H is head unload time (1=16ms, 2=32ms, etc)
537 * Because these are written to by the DMA controller, they must
538 * not contain a 64k byte boundary crossing, or data will be
541 static char *floppy_track_buffer;
542 static int max_buffer_sectors;
545 typedef void (*done_f)(int);
546 static const struct cont_t {
547 void (*interrupt)(void);
548 /* this is called after the interrupt of the
550 void (*redo)(void); /* this is called to retry the operation */
551 void (*error)(void); /* this is called to tally an error */
552 done_f done; /* this is called to say if the operation has
553 * succeeded/failed */
556 static void floppy_ready(void);
557 static void floppy_start(void);
558 static void process_fd_request(void);
559 static void recalibrate_floppy(void);
560 static void floppy_shutdown(struct work_struct *);
562 static int floppy_request_regions(int);
563 static void floppy_release_regions(int);
564 static int floppy_grab_irq_and_dma(void);
565 static void floppy_release_irq_and_dma(void);
568 * The "reset" variable should be tested whenever an interrupt is scheduled,
569 * after the commands have been sent. This is to ensure that the driver doesn't
570 * get wedged when the interrupt doesn't come because of a failed command.
571 * reset doesn't need to be tested before sending commands, because
572 * output_byte is automatically disabled when reset is set.
574 static void reset_fdc(void);
577 * These are global variables, as that's the easiest way to give
578 * information to interrupts. They are the data used for the current
582 #define NEED_1_RECAL -2
583 #define NEED_2_RECAL -3
585 static atomic_t usage_count = ATOMIC_INIT(0);
587 /* buffer related variables */
588 static int buffer_track = -1;
589 static int buffer_drive = -1;
590 static int buffer_min = -1;
591 static int buffer_max = -1;
593 /* fdc related variables, should end up in a struct */
594 static struct floppy_fdc_state fdc_state[N_FDC];
595 static int fdc; /* current fdc */
597 static struct workqueue_struct *floppy_wq;
599 static struct floppy_struct *_floppy = floppy_type;
600 static unsigned char current_drive;
601 static long current_count_sectors;
602 static unsigned char fsector_t; /* sector in track */
603 static unsigned char in_sector_offset; /* offset within physical sector,
604 * expressed in units of 512 bytes */
606 static inline bool drive_no_geom(int drive)
608 return !current_type[drive] && !ITYPE(UDRS->fd_device);
612 static inline int fd_eject(int drive)
623 static long unsigned debugtimer;
625 static inline void set_debugt(void)
627 debugtimer = jiffies;
630 static inline void debugt(const char *func, const char *msg)
632 if (DP->flags & DEBUGT)
633 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
636 static inline void set_debugt(void) { }
637 static inline void debugt(const char *func, const char *msg) { }
641 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
642 static const char *timeout_message;
644 static void is_alive(const char *func, const char *message)
646 /* this routine checks whether the floppy driver is "alive" */
647 if (test_bit(0, &fdc_busy) && command_status < 2 &&
648 !delayed_work_pending(&fd_timeout)) {
649 DPRINT("%s: timeout handler died. %s\n", func, message);
653 static void (*do_floppy)(void) = NULL;
657 static void (*lasthandler)(void);
658 static unsigned long interruptjiffies;
659 static unsigned long resultjiffies;
660 static int resultsize;
661 static unsigned long lastredo;
663 static struct output_log {
665 unsigned char status;
666 unsigned long jiffies;
667 } output_log[OLOGSIZE];
669 static int output_log_pos;
671 #define current_reqD -1
672 #define MAXTIMEOUT -2
674 static void __reschedule_timeout(int drive, const char *message)
678 if (drive == current_reqD)
679 drive = current_drive;
681 if (drive < 0 || drive >= N_DRIVE) {
685 delay = UDP->timeout;
687 mod_delayed_work(floppy_wq, &fd_timeout, delay);
688 if (UDP->flags & FD_DEBUG)
689 DPRINT("reschedule timeout %s\n", message);
690 timeout_message = message;
693 static void reschedule_timeout(int drive, const char *message)
697 spin_lock_irqsave(&floppy_lock, flags);
698 __reschedule_timeout(drive, message);
699 spin_unlock_irqrestore(&floppy_lock, flags);
702 #define INFBOUND(a, b) (a) = max_t(int, a, b)
703 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
706 * Bottom half floppy driver.
707 * ==========================
709 * This part of the file contains the code talking directly to the hardware,
710 * and also the main service loop (seek-configure-spinup-command)
715 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
716 * and the last_checked date.
718 * last_checked is the date of the last check which showed 'no disk change'
719 * FD_DISK_CHANGE is set under two conditions:
720 * 1. The floppy has been changed after some i/o to that floppy already
722 * 2. No floppy disk is in the drive. This is done in order to ensure that
723 * requests are quickly flushed in case there is no disk in the drive. It
724 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
727 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
728 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
729 * each seek. If a disk is present, the disk change line should also be
730 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
731 * change line is set, this means either that no disk is in the drive, or
732 * that it has been removed since the last seek.
734 * This means that we really have a third possibility too:
735 * The floppy has been changed after the last seek.
738 static int disk_change(int drive)
740 int fdc = FDC(drive);
742 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
743 DPRINT("WARNING disk change called early\n");
744 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
745 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
746 DPRINT("probing disk change on unselected drive\n");
747 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
748 (unsigned int)FDCS->dor);
751 debug_dcl(UDP->flags,
752 "checking disk change line for drive %d\n", drive);
753 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
754 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
755 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);
757 if (UDP->flags & FD_BROKEN_DCL)
758 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
759 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
760 set_bit(FD_VERIFY_BIT, &UDRS->flags);
761 /* verify write protection */
763 if (UDRS->maxblock) /* mark it changed */
764 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
766 /* invalidate its geometry */
767 if (UDRS->keep_data >= 0) {
768 if ((UDP->flags & FTD_MSG) &&
769 current_type[drive] != NULL)
770 DPRINT("Disk type is undefined after disk change\n");
771 current_type[drive] = NULL;
772 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
777 UDRS->last_checked = jiffies;
778 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
783 static inline int is_selected(int dor, int unit)
785 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
788 static bool is_ready_state(int status)
790 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
791 return state == STATUS_READY;
794 static int set_dor(int fdc, char mask, char data)
798 unsigned char newdor;
799 unsigned char olddor;
801 if (FDCS->address == -1)
805 newdor = (olddor & mask) | data;
806 if (newdor != olddor) {
808 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
809 drive = REVDRIVE(fdc, unit);
810 debug_dcl(UDP->flags,
811 "calling disk change from set_dor\n");
815 fd_outb(newdor, FD_DOR);
818 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
819 drive = REVDRIVE(fdc, unit);
820 UDRS->select_date = jiffies;
826 static void twaddle(void)
828 if (DP->select_delay)
830 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
831 fd_outb(FDCS->dor, FD_DOR);
832 DRS->select_date = jiffies;
836 * Reset all driver information about the current fdc.
837 * This is needed after a reset, and after a raw command.
839 static void reset_fdc_info(int mode)
843 FDCS->spec1 = FDCS->spec2 = -1;
844 FDCS->need_configure = 1;
847 for (drive = 0; drive < N_DRIVE; drive++)
848 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
849 UDRS->track = NEED_2_RECAL;
852 /* selects the fdc and drive, and enables the fdc's input/dma. */
853 static void set_fdc(int drive)
855 if (drive >= 0 && drive < N_DRIVE) {
857 current_drive = drive;
859 if (fdc != 1 && fdc != 0) {
860 pr_info("bad fdc value\n");
865 set_dor(1 - fdc, ~8, 0);
867 if (FDCS->rawcmd == 2)
869 if (fd_inb(FD_STATUS) != STATUS_READY)
873 /* locks the driver */
874 static int lock_fdc(int drive)
876 if (WARN(atomic_read(&usage_count) == 0,
877 "Trying to lock fdc while usage count=0\n"))
880 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
883 command_status = FD_COMMAND_NONE;
885 reschedule_timeout(drive, "lock fdc");
890 /* unlocks the driver */
891 static void unlock_fdc(void)
893 if (!test_bit(0, &fdc_busy))
894 DPRINT("FDC access conflict!\n");
897 command_status = FD_COMMAND_NONE;
898 cancel_delayed_work(&fd_timeout);
901 clear_bit(0, &fdc_busy);
905 /* switches the motor off after a given timeout */
906 static void motor_off_callback(struct timer_list *t)
908 unsigned long nr = t - motor_off_timer;
909 unsigned char mask = ~(0x10 << UNIT(nr));
911 if (WARN_ON_ONCE(nr >= N_DRIVE))
914 set_dor(FDC(nr), mask, 0);
917 /* schedules motor off */
918 static void floppy_off(unsigned int drive)
920 unsigned long volatile delta;
921 int fdc = FDC(drive);
923 if (!(FDCS->dor & (0x10 << UNIT(drive))))
926 del_timer(motor_off_timer + drive);
928 /* make spindle stop in a position which minimizes spinup time
931 delta = jiffies - UDRS->first_read_date + HZ -
932 UDP->spindown_offset;
933 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
934 motor_off_timer[drive].expires =
935 jiffies + UDP->spindown - delta;
937 add_timer(motor_off_timer + drive);
941 * cycle through all N_DRIVE floppy drives, for disk change testing.
942 * stopping at current drive. This is done before any long operation, to
943 * be sure to have up to date disk change information.
945 static void scandrives(void)
951 if (DP->select_delay)
954 saved_drive = current_drive;
955 for (i = 0; i < N_DRIVE; i++) {
956 drive = (saved_drive + i + 1) % N_DRIVE;
957 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
958 continue; /* skip closed drives */
960 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
961 (0x10 << UNIT(drive))))
962 /* switch the motor off again, if it was off to
964 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
966 set_fdc(saved_drive);
969 static void empty(void)
973 static void (*floppy_work_fn)(void);
975 static void floppy_work_workfn(struct work_struct *work)
980 static DECLARE_WORK(floppy_work, floppy_work_workfn);
982 static void schedule_bh(void (*handler)(void))
984 WARN_ON(work_pending(&floppy_work));
986 floppy_work_fn = handler;
987 queue_work(floppy_wq, &floppy_work);
990 static void (*fd_timer_fn)(void) = NULL;
992 static void fd_timer_workfn(struct work_struct *work)
997 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
999 static void cancel_activity(void)
1002 cancel_delayed_work_sync(&fd_timer);
1003 cancel_work_sync(&floppy_work);
1006 /* this function makes sure that the disk stays in the drive during the
1008 static void fd_watchdog(void)
1010 debug_dcl(DP->flags, "calling disk change from watchdog\n");
1012 if (disk_change(current_drive)) {
1013 DPRINT("disk removed during i/o\n");
1018 cancel_delayed_work(&fd_timer);
1019 fd_timer_fn = fd_watchdog;
1020 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
1024 static void main_command_interrupt(void)
1026 cancel_delayed_work(&fd_timer);
1030 /* waits for a delay (spinup or select) to pass */
1031 static int fd_wait_for_completion(unsigned long expires,
1032 void (*function)(void))
1035 reset_fdc(); /* do the reset during sleep to win time
1036 * if we don't need to sleep, it's a good
1037 * occasion anyways */
1041 if (time_before(jiffies, expires)) {
1042 cancel_delayed_work(&fd_timer);
1043 fd_timer_fn = function;
1044 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
1050 static void setup_DMA(void)
1054 if (raw_cmd->length == 0) {
1057 pr_info("zero dma transfer size:");
1058 for (i = 0; i < raw_cmd->cmd_count; i++)
1059 pr_cont("%x,", raw_cmd->cmd[i]);
1065 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1066 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1071 f = claim_dma_lock();
1074 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1075 (raw_cmd->flags & FD_RAW_READ) ?
1076 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1077 release_dma_lock(f);
1082 release_dma_lock(f);
1085 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1086 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1087 DMA_MODE_READ : DMA_MODE_WRITE);
1088 fd_set_dma_addr(raw_cmd->kernel_data);
1089 fd_set_dma_count(raw_cmd->length);
1090 virtual_dma_port = FDCS->address;
1092 release_dma_lock(f);
1096 static void show_floppy(void);
1098 /* waits until the fdc becomes ready */
1099 static int wait_til_ready(void)
1106 for (counter = 0; counter < 10000; counter++) {
1107 status = fd_inb(FD_STATUS);
1108 if (status & STATUS_READY)
1112 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1119 /* sends a command byte to the fdc */
1120 static int output_byte(char byte)
1122 int status = wait_til_ready();
1127 if (is_ready_state(status)) {
1128 fd_outb(byte, FD_DATA);
1129 output_log[output_log_pos].data = byte;
1130 output_log[output_log_pos].status = status;
1131 output_log[output_log_pos].jiffies = jiffies;
1132 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1137 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1144 /* gets the response from the fdc */
1145 static int result(void)
1150 for (i = 0; i < MAX_REPLIES; i++) {
1151 status = wait_til_ready();
1154 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1155 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1156 resultjiffies = jiffies;
1160 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1161 reply_buffer[i] = fd_inb(FD_DATA);
1166 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1174 #define MORE_OUTPUT -2
1175 /* does the fdc need more output? */
1176 static int need_more_output(void)
1178 int status = wait_til_ready();
1183 if (is_ready_state(status))
1189 /* Set perpendicular mode as required, based on data rate, if supported.
1190 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1192 static void perpendicular_mode(void)
1194 unsigned char perp_mode;
1196 if (raw_cmd->rate & 0x40) {
1197 switch (raw_cmd->rate & 3) {
1205 DPRINT("Invalid data rate for perpendicular mode!\n");
1209 * convenient way to return to
1210 * redo without too much hassle
1211 * (deep stack et al.)
1218 if (FDCS->perp_mode == perp_mode)
1220 if (FDCS->version >= FDC_82077_ORIG) {
1221 output_byte(FD_PERPENDICULAR);
1222 output_byte(perp_mode);
1223 FDCS->perp_mode = perp_mode;
1224 } else if (perp_mode) {
1225 DPRINT("perpendicular mode not supported by this FDC.\n");
1227 } /* perpendicular_mode */
1229 static int fifo_depth = 0xa;
1232 static int fdc_configure(void)
1235 output_byte(FD_CONFIGURE);
1236 if (need_more_output() != MORE_OUTPUT)
1239 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1240 output_byte(0); /* pre-compensation from track
1245 #define NOMINAL_DTR 500
1247 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1248 * head load time, and DMA disable flag to values needed by floppy.
1250 * The value "dtr" is the data transfer rate in Kbps. It is needed
1251 * to account for the data rate-based scaling done by the 82072 and 82077
1252 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1255 * Note that changing the data transfer rate has a (probably deleterious)
1256 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1257 * fdc_specify is called again after each data transfer rate
1260 * srt: 1000 to 16000 in microseconds
1261 * hut: 16 to 240 milliseconds
1262 * hlt: 2 to 254 milliseconds
1264 * These values are rounded up to the next highest available delay time.
1266 static void fdc_specify(void)
1268 unsigned char spec1;
1269 unsigned char spec2;
1273 unsigned long dtr = NOMINAL_DTR;
1274 unsigned long scale_dtr = NOMINAL_DTR;
1275 int hlt_max_code = 0x7f;
1276 int hut_max_code = 0xf;
1278 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1280 FDCS->need_configure = 0;
1283 switch (raw_cmd->rate & 0x03) {
1289 if (FDCS->version >= FDC_82078) {
1290 /* chose the default rate table, not the one
1291 * where 1 = 2 Mbps */
1292 output_byte(FD_DRIVESPEC);
1293 if (need_more_output() == MORE_OUTPUT) {
1294 output_byte(UNIT(current_drive));
1304 if (FDCS->version >= FDC_82072) {
1306 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1307 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1310 /* Convert step rate from microseconds to milliseconds and 4 bits */
1311 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1318 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1321 else if (hlt > 0x7f)
1324 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1330 spec1 = (srt << 4) | hut;
1331 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1333 /* If these parameters did not change, just return with success */
1334 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1335 /* Go ahead and set spec1 and spec2 */
1336 output_byte(FD_SPECIFY);
1337 output_byte(FDCS->spec1 = spec1);
1338 output_byte(FDCS->spec2 = spec2);
1342 /* Set the FDC's data transfer rate on behalf of the specified drive.
1343 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1344 * of the specify command (i.e. using the fdc_specify function).
1346 static int fdc_dtr(void)
1348 /* If data rate not already set to desired value, set it. */
1349 if ((raw_cmd->rate & 3) == FDCS->dtr)
1353 fd_outb(raw_cmd->rate & 3, FD_DCR);
1355 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1356 * need a stabilization period of several milliseconds to be
1357 * enforced after data rate changes before R/W operations.
1358 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1360 FDCS->dtr = raw_cmd->rate & 3;
1361 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready);
1364 static void tell_sector(void)
1366 pr_cont(": track %d, head %d, sector %d, size %d",
1367 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1370 static void print_errors(void)
1373 if (ST0 & ST0_ECE) {
1374 pr_cont("Recalibrate failed!");
1375 } else if (ST2 & ST2_CRC) {
1376 pr_cont("data CRC error");
1378 } else if (ST1 & ST1_CRC) {
1379 pr_cont("CRC error");
1381 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1384 pr_cont("sector not found");
1387 pr_cont("probe failed...");
1388 } else if (ST2 & ST2_WC) { /* seek error */
1389 pr_cont("wrong cylinder");
1390 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1391 pr_cont("bad cylinder");
1393 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1401 * OK, this error interpreting routine is called after a
1402 * DMA read/write has succeeded
1403 * or failed, so we check the results, and copy any buffers.
1404 * hhb: Added better error reporting.
1405 * ak: Made this into a separate routine.
1407 static int interpret_errors(void)
1412 DPRINT("-- FDC reply error\n");
1417 /* check IC to find cause of interrupt */
1418 switch (ST0 & ST0_INTR) {
1419 case 0x40: /* error occurred during command execution */
1421 return 0; /* occurs with pseudo-DMA */
1424 DPRINT("Drive is write protected\n");
1425 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1428 } else if (ST1 & ST1_ND) {
1429 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1430 } else if (ST1 & ST1_OR) {
1431 if (DP->flags & FTD_MSG)
1432 DPRINT("Over/Underrun - retrying\n");
1434 } else if (*errors >= DP->max_errors.reporting) {
1437 if (ST2 & ST2_WC || ST2 & ST2_BC)
1438 /* wrong cylinder => recal */
1439 DRS->track = NEED_2_RECAL;
1441 case 0x80: /* invalid command given */
1442 DPRINT("Invalid FDC command given!\n");
1446 DPRINT("Abnormal termination caused by polling\n");
1449 default: /* (0) Normal command termination */
1455 * This routine is called when everything should be correctly set up
1456 * for the transfer (i.e. floppy motor is on, the correct floppy is
1457 * selected, and the head is sitting on the right track).
1459 static void setup_rw_floppy(void)
1465 unsigned long ready_date;
1466 void (*function)(void);
1468 flags = raw_cmd->flags;
1469 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1470 flags |= FD_RAW_INTR;
1472 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1473 ready_date = DRS->spinup_date + DP->spinup;
1474 /* If spinup will take a long time, rerun scandrives
1475 * again just before spinup completion. Beware that
1476 * after scandrives, we must again wait for selection.
1478 if (time_after(ready_date, jiffies + DP->select_delay)) {
1479 ready_date -= DP->select_delay;
1480 function = floppy_start;
1482 function = setup_rw_floppy;
1484 /* wait until the floppy is spinning fast enough */
1485 if (fd_wait_for_completion(ready_date, function))
1488 dflags = DRS->flags;
1490 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1493 if (flags & FD_RAW_INTR)
1494 do_floppy = main_command_interrupt;
1497 for (i = 0; i < raw_cmd->cmd_count; i++)
1498 r |= output_byte(raw_cmd->cmd[i]);
1500 debugt(__func__, "rw_command");
1508 if (!(flags & FD_RAW_INTR)) {
1511 } else if (flags & FD_RAW_NEED_DISK)
1515 static int blind_seek;
1518 * This is the routine called after every seek (or recalibrate) interrupt
1519 * from the floppy controller.
1521 static void seek_interrupt(void)
1523 debugt(__func__, "");
1524 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1525 DPRINT("seek failed\n");
1526 DRS->track = NEED_2_RECAL;
1531 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1532 debug_dcl(DP->flags,
1533 "clearing NEWCHANGE flag because of effective seek\n");
1534 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1535 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1536 /* effective seek */
1537 DRS->select_date = jiffies;
1543 static void check_wp(void)
1545 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1546 /* check write protection */
1547 output_byte(FD_GETSTATUS);
1548 output_byte(UNIT(current_drive));
1549 if (result() != 1) {
1553 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1554 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1555 debug_dcl(DP->flags,
1556 "checking whether disk is write protected\n");
1557 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1559 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1561 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1565 static void seek_floppy(void)
1571 debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
1573 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1574 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1575 /* the media changed flag should be cleared after the seek.
1576 * If it isn't, this means that there is really no disk in
1579 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1584 if (DRS->track <= NEED_1_RECAL) {
1585 recalibrate_floppy();
1587 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1588 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1589 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1590 /* we seek to clear the media-changed condition. Does anybody
1591 * know a more elegant way, which works on all drives? */
1593 track = raw_cmd->track - 1;
1595 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1596 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1598 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1604 if (raw_cmd->track != DRS->track &&
1605 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1606 track = raw_cmd->track;
1613 do_floppy = seek_interrupt;
1614 output_byte(FD_SEEK);
1615 output_byte(UNIT(current_drive));
1616 if (output_byte(track) < 0) {
1620 debugt(__func__, "");
1623 static void recal_interrupt(void)
1625 debugt(__func__, "");
1628 else if (ST0 & ST0_ECE) {
1629 switch (DRS->track) {
1631 debugt(__func__, "need 1 recal");
1632 /* after a second recalibrate, we still haven't
1633 * reached track 0. Probably no drive. Raise an
1634 * error, as failing immediately might upset
1635 * computers possessed by the Devil :-) */
1640 debugt(__func__, "need 2 recal");
1641 /* If we already did a recalibrate,
1642 * and we are not at track 0, this
1643 * means we have moved. (The only way
1644 * not to move at recalibration is to
1645 * be already at track 0.) Clear the
1646 * new change flag */
1647 debug_dcl(DP->flags,
1648 "clearing NEWCHANGE flag because of second recalibrate\n");
1650 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1651 DRS->select_date = jiffies;
1654 debugt(__func__, "default");
1655 /* Recalibrate moves the head by at
1656 * most 80 steps. If after one
1657 * recalibrate we don't have reached
1658 * track 0, this might mean that we
1659 * started beyond track 80. Try
1661 DRS->track = NEED_1_RECAL;
1669 static void print_result(char *message, int inr)
1673 DPRINT("%s ", message);
1675 for (i = 0; i < inr; i++)
1676 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1680 /* interrupt handler. Note that this can be called externally on the Sparc */
1681 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1685 void (*handler)(void) = do_floppy;
1687 lasthandler = handler;
1688 interruptjiffies = jiffies;
1690 f = claim_dma_lock();
1692 release_dma_lock(f);
1695 if (fdc >= N_FDC || FDCS->address == -1) {
1696 /* we don't even know which FDC is the culprit */
1697 pr_info("DOR0=%x\n", fdc_state[0].dor);
1698 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1699 pr_info("handler=%pf\n", handler);
1700 is_alive(__func__, "bizarre fdc");
1705 /* We have to clear the reset flag here, because apparently on boxes
1706 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1707 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1708 * emission of the SENSEI's.
1709 * It is OK to emit floppy commands because we are in an interrupt
1710 * handler here, and thus we have to fear no interference of other
1714 do_print = !handler && print_unex && initialized;
1718 print_result("unexpected interrupt", inr);
1722 output_byte(FD_SENSEI);
1725 print_result("sensei", inr);
1727 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1728 inr == 2 && max_sensei);
1734 schedule_bh(handler);
1735 is_alive(__func__, "normal interrupt end");
1737 /* FIXME! Was it really for us? */
1741 static void recalibrate_floppy(void)
1743 debugt(__func__, "");
1744 do_floppy = recal_interrupt;
1745 output_byte(FD_RECALIBRATE);
1746 if (output_byte(UNIT(current_drive)) < 0)
1751 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1753 static void reset_interrupt(void)
1755 debugt(__func__, "");
1756 result(); /* get the status ready for set_fdc */
1758 pr_info("reset set in interrupt, calling %pf\n", cont->error);
1759 cont->error(); /* a reset just after a reset. BAD! */
1765 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1766 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1768 static void reset_fdc(void)
1770 unsigned long flags;
1772 do_floppy = reset_interrupt;
1776 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1777 /* Irrelevant for systems with true DMA (i386). */
1779 flags = claim_dma_lock();
1781 release_dma_lock(flags);
1783 if (FDCS->version >= FDC_82072A)
1784 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1786 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1787 udelay(FD_RESET_DELAY);
1788 fd_outb(FDCS->dor, FD_DOR);
1792 static void show_floppy(void)
1797 pr_info("floppy driver state\n");
1798 pr_info("-------------------\n");
1799 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1800 jiffies, interruptjiffies, jiffies - interruptjiffies,
1803 pr_info("timeout_message=%s\n", timeout_message);
1804 pr_info("last output bytes:\n");
1805 for (i = 0; i < OLOGSIZE; i++)
1806 pr_info("%2x %2x %lu\n",
1807 output_log[(i + output_log_pos) % OLOGSIZE].data,
1808 output_log[(i + output_log_pos) % OLOGSIZE].status,
1809 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1810 pr_info("last result at %lu\n", resultjiffies);
1811 pr_info("last redo_fd_request at %lu\n", lastredo);
1812 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1813 reply_buffer, resultsize, true);
1815 pr_info("status=%x\n", fd_inb(FD_STATUS));
1816 pr_info("fdc_busy=%lu\n", fdc_busy);
1818 pr_info("do_floppy=%pf\n", do_floppy);
1819 if (work_pending(&floppy_work))
1820 pr_info("floppy_work.func=%pf\n", floppy_work.func);
1821 if (delayed_work_pending(&fd_timer))
1822 pr_info("delayed work.function=%p expires=%ld\n",
1824 fd_timer.timer.expires - jiffies);
1825 if (delayed_work_pending(&fd_timeout))
1826 pr_info("timer_function=%p expires=%ld\n",
1827 fd_timeout.work.func,
1828 fd_timeout.timer.expires - jiffies);
1830 pr_info("cont=%p\n", cont);
1831 pr_info("current_req=%p\n", current_req);
1832 pr_info("command_status=%d\n", command_status);
1836 static void floppy_shutdown(struct work_struct *arg)
1838 unsigned long flags;
1844 flags = claim_dma_lock();
1846 release_dma_lock(flags);
1848 /* avoid dma going to a random drive after shutdown */
1851 DPRINT("floppy timeout called\n");
1855 cont->redo(); /* this will recall reset when needed */
1857 pr_info("no cont in shutdown!\n");
1858 process_fd_request();
1860 is_alive(__func__, "");
1863 /* start motor, check media-changed condition and write protection */
1864 static int start_motor(void (*function)(void))
1870 data = UNIT(current_drive);
1871 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1872 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1874 /* no read since this drive is running */
1875 DRS->first_read_date = 0;
1876 /* note motor start time if motor is not yet running */
1877 DRS->spinup_date = jiffies;
1878 data |= (0x10 << UNIT(current_drive));
1880 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1881 mask &= ~(0x10 << UNIT(current_drive));
1883 /* starts motor and selects floppy */
1884 del_timer(motor_off_timer + current_drive);
1885 set_dor(fdc, mask, data);
1887 /* wait_for_completion also schedules reset if needed. */
1888 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1892 static void floppy_ready(void)
1898 if (start_motor(floppy_ready))
1903 debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1904 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1905 disk_change(current_drive) && !DP->select_delay)
1906 twaddle(); /* this clears the dcl on certain
1907 * drive/controller combinations */
1909 #ifdef fd_chose_dma_mode
1910 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1911 unsigned long flags = claim_dma_lock();
1912 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1913 release_dma_lock(flags);
1917 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1918 perpendicular_mode();
1919 fdc_specify(); /* must be done here because of hut, hlt ... */
1922 if ((raw_cmd->flags & FD_RAW_READ) ||
1923 (raw_cmd->flags & FD_RAW_WRITE))
1929 static void floppy_start(void)
1931 reschedule_timeout(current_reqD, "floppy start");
1934 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1935 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1940 * ========================================================================
1941 * here ends the bottom half. Exported routines are:
1942 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1943 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1944 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1946 * ========================================================================
1949 * General purpose continuations.
1950 * ==============================
1953 static void do_wakeup(void)
1955 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1957 command_status += 2;
1958 wake_up(&command_done);
1961 static const struct cont_t wakeup_cont = {
1965 .done = (done_f)empty
1968 static const struct cont_t intr_cont = {
1970 .redo = process_fd_request,
1972 .done = (done_f)empty
1975 static int wait_til_done(void (*handler)(void), bool interruptible)
1979 schedule_bh(handler);
1982 wait_event_interruptible(command_done, command_status >= 2);
1984 wait_event(command_done, command_status >= 2);
1986 if (command_status < 2) {
1994 command_status = FD_COMMAND_ERROR;
1995 if (command_status == FD_COMMAND_OKAY)
1999 command_status = FD_COMMAND_NONE;
2003 static void generic_done(int result)
2005 command_status = result;
2006 cont = &wakeup_cont;
2009 static void generic_success(void)
2014 static void generic_failure(void)
2019 static void success_and_wakeup(void)
2026 * formatting and rw support.
2027 * ==========================
2030 static int next_valid_format(void)
2034 probed_format = DRS->probed_format;
2036 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2037 DRS->probed_format = 0;
2040 if (floppy_type[DP->autodetect[probed_format]].sect) {
2041 DRS->probed_format = probed_format;
2048 static void bad_flp_intr(void)
2053 DRS->probed_format++;
2054 if (!next_valid_format())
2057 err_count = ++(*errors);
2058 INFBOUND(DRWE->badness, err_count);
2059 if (err_count > DP->max_errors.abort)
2061 if (err_count > DP->max_errors.reset)
2063 else if (err_count > DP->max_errors.recal)
2064 DRS->track = NEED_2_RECAL;
2067 static void set_floppy(int drive)
2069 int type = ITYPE(UDRS->fd_device);
2072 _floppy = floppy_type + type;
2074 _floppy = current_type[drive];
2078 * formatting support.
2079 * ===================
2081 static void format_interrupt(void)
2083 switch (interpret_errors()) {
2094 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2095 #define CT(x) ((x) | 0xc0)
2097 static void setup_format_params(int track)
2105 unsigned char track, head, sect, size;
2106 } *here = (struct fparm *)floppy_track_buffer;
2108 raw_cmd = &default_raw_cmd;
2109 raw_cmd->track = track;
2111 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2112 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2113 raw_cmd->rate = _floppy->rate & 0x43;
2114 raw_cmd->cmd_count = NR_F;
2115 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2116 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2117 F_SIZECODE = FD_SIZECODE(_floppy);
2118 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2119 F_GAP = _floppy->fmt_gap;
2120 F_FILL = FD_FILL_BYTE;
2122 raw_cmd->kernel_data = floppy_track_buffer;
2123 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2125 /* allow for about 30ms for data transport per track */
2126 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2128 /* a ``cylinder'' is two tracks plus a little stepping time */
2129 track_shift = 2 * head_shift + 3;
2131 /* position of logical sector 1 on this track */
2132 n = (track_shift * format_req.track + head_shift * format_req.head)
2135 /* determine interleave */
2137 if (_floppy->fmt_gap < 0x22)
2140 /* initialize field */
2141 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2142 here[count].track = format_req.track;
2143 here[count].head = format_req.head;
2144 here[count].sect = 0;
2145 here[count].size = F_SIZECODE;
2147 /* place logical sectors */
2148 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2149 here[n].sect = count;
2150 n = (n + il) % F_SECT_PER_TRACK;
2151 if (here[n].sect) { /* sector busy, find next free sector */
2153 if (n >= F_SECT_PER_TRACK) {
2154 n -= F_SECT_PER_TRACK;
2155 while (here[n].sect)
2160 if (_floppy->stretch & FD_SECTBASEMASK) {
2161 for (count = 0; count < F_SECT_PER_TRACK; count++)
2162 here[count].sect += FD_SECTBASE(_floppy) - 1;
2166 static void redo_format(void)
2169 setup_format_params(format_req.track << STRETCH(_floppy));
2171 debugt(__func__, "queue format request");
2174 static const struct cont_t format_cont = {
2175 .interrupt = format_interrupt,
2176 .redo = redo_format,
2177 .error = bad_flp_intr,
2178 .done = generic_done
2181 static int do_format(int drive, struct format_descr *tmp_format_req)
2185 if (lock_fdc(drive))
2190 _floppy->track > DP->tracks ||
2191 tmp_format_req->track >= _floppy->track ||
2192 tmp_format_req->head >= _floppy->head ||
2193 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2194 !_floppy->fmt_gap) {
2195 process_fd_request();
2198 format_req = *tmp_format_req;
2200 cont = &format_cont;
2201 errors = &format_errors;
2202 ret = wait_til_done(redo_format, true);
2205 process_fd_request();
2210 * Buffer read/write and support
2211 * =============================
2214 static void floppy_end_request(struct request *req, blk_status_t error)
2216 unsigned int nr_sectors = current_count_sectors;
2217 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2219 /* current_count_sectors can be zero if transfer failed */
2221 nr_sectors = blk_rq_cur_sectors(req);
2222 if (__blk_end_request(req, error, nr_sectors << 9))
2225 /* We're done with the request */
2230 /* new request_done. Can handle physical sectors which are smaller than a
2232 static void request_done(int uptodate)
2234 struct request *req = current_req;
2235 struct request_queue *q;
2236 unsigned long flags;
2238 char msg[sizeof("request done ") + sizeof(int) * 3];
2241 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2242 reschedule_timeout(MAXTIMEOUT, msg);
2245 pr_info("floppy.c: no request in request_done\n");
2252 /* maintain values for invalidation on geometry
2254 block = current_count_sectors + blk_rq_pos(req);
2255 INFBOUND(DRS->maxblock, block);
2256 if (block > _floppy->sect)
2259 /* unlock chained buffers */
2260 spin_lock_irqsave(q->queue_lock, flags);
2261 floppy_end_request(req, 0);
2262 spin_unlock_irqrestore(q->queue_lock, flags);
2264 if (rq_data_dir(req) == WRITE) {
2265 /* record write error information */
2266 DRWE->write_errors++;
2267 if (DRWE->write_errors == 1) {
2268 DRWE->first_error_sector = blk_rq_pos(req);
2269 DRWE->first_error_generation = DRS->generation;
2271 DRWE->last_error_sector = blk_rq_pos(req);
2272 DRWE->last_error_generation = DRS->generation;
2274 spin_lock_irqsave(q->queue_lock, flags);
2275 floppy_end_request(req, BLK_STS_IOERR);
2276 spin_unlock_irqrestore(q->queue_lock, flags);
2280 /* Interrupt handler evaluating the result of the r/w operation */
2281 static void rw_interrupt(void)
2289 /* some Toshiba floppy controllers occasionnally seem to
2290 * return bogus interrupts after read/write operations, which
2291 * can be recognized by a bad head number (>= 2) */
2295 if (!DRS->first_read_date)
2296 DRS->first_read_date = jiffies;
2299 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2311 nr_sectors = (((R_TRACK - TRACK) * heads +
2312 R_HEAD - HEAD) * SECT_PER_TRACK +
2313 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2315 if (nr_sectors / ssize >
2316 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2317 DPRINT("long rw: %x instead of %lx\n",
2318 nr_sectors, current_count_sectors);
2319 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2320 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2321 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2322 pr_info("heads=%d eoc=%d\n", heads, eoc);
2323 pr_info("spt=%d st=%d ss=%d\n",
2324 SECT_PER_TRACK, fsector_t, ssize);
2325 pr_info("in_sector_offset=%d\n", in_sector_offset);
2328 nr_sectors -= in_sector_offset;
2329 INFBOUND(nr_sectors, 0);
2330 SUPBOUND(current_count_sectors, nr_sectors);
2332 switch (interpret_errors()) {
2337 if (!current_count_sectors) {
2344 if (!current_count_sectors) {
2348 current_type[current_drive] = _floppy;
2349 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2354 if (DP->flags & FTD_MSG)
2355 DPRINT("Auto-detected floppy type %s in fd%d\n",
2356 _floppy->name, current_drive);
2357 current_type[current_drive] = _floppy;
2358 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2362 if (CT(COMMAND) != FD_READ ||
2363 raw_cmd->kernel_data == bio_data(current_req->bio)) {
2364 /* transfer directly from buffer */
2366 } else if (CT(COMMAND) == FD_READ) {
2367 buffer_track = raw_cmd->track;
2368 buffer_drive = current_drive;
2369 INFBOUND(buffer_max, nr_sectors + fsector_t);
2374 /* Compute maximal contiguous buffer size. */
2375 static int buffer_chain_size(void)
2379 struct req_iterator iter;
2382 base = bio_data(current_req->bio);
2385 rq_for_each_segment(bv, current_req, iter) {
2386 if (page_address(bv.bv_page) + bv.bv_offset != base + size)
2395 /* Compute the maximal transfer size */
2396 static int transfer_size(int ssize, int max_sector, int max_size)
2398 SUPBOUND(max_sector, fsector_t + max_size);
2401 max_sector -= (max_sector % _floppy->sect) % ssize;
2403 /* transfer size, beginning not aligned */
2404 current_count_sectors = max_sector - fsector_t;
2410 * Move data from/to the track buffer to/from the buffer cache.
2412 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2414 int remaining; /* number of transferred 512-byte sectors */
2419 struct req_iterator iter;
2421 max_sector = transfer_size(ssize,
2422 min(max_sector, max_sector_2),
2423 blk_rq_sectors(current_req));
2425 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2426 buffer_max > fsector_t + blk_rq_sectors(current_req))
2427 current_count_sectors = min_t(int, buffer_max - fsector_t,
2428 blk_rq_sectors(current_req));
2430 remaining = current_count_sectors << 9;
2431 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2432 DPRINT("in copy buffer\n");
2433 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2434 pr_info("remaining=%d\n", remaining >> 9);
2435 pr_info("current_req->nr_sectors=%u\n",
2436 blk_rq_sectors(current_req));
2437 pr_info("current_req->current_nr_sectors=%u\n",
2438 blk_rq_cur_sectors(current_req));
2439 pr_info("max_sector=%d\n", max_sector);
2440 pr_info("ssize=%d\n", ssize);
2443 buffer_max = max(max_sector, buffer_max);
2445 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2447 size = blk_rq_cur_bytes(current_req);
2449 rq_for_each_segment(bv, current_req, iter) {
2454 SUPBOUND(size, remaining);
2456 buffer = page_address(bv.bv_page) + bv.bv_offset;
2457 if (dma_buffer + size >
2458 floppy_track_buffer + (max_buffer_sectors << 10) ||
2459 dma_buffer < floppy_track_buffer) {
2460 DPRINT("buffer overrun in copy buffer %d\n",
2461 (int)((floppy_track_buffer - dma_buffer) >> 9));
2462 pr_info("fsector_t=%d buffer_min=%d\n",
2463 fsector_t, buffer_min);
2464 pr_info("current_count_sectors=%ld\n",
2465 current_count_sectors);
2466 if (CT(COMMAND) == FD_READ)
2468 if (CT(COMMAND) == FD_WRITE)
2472 if (((unsigned long)buffer) % 512)
2473 DPRINT("%p buffer not aligned\n", buffer);
2475 if (CT(COMMAND) == FD_READ)
2476 memcpy(buffer, dma_buffer, size);
2478 memcpy(dma_buffer, buffer, size);
2485 max_sector -= remaining >> 9;
2486 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2490 /* work around a bug in pseudo DMA
2491 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2492 * sending data. Hence we need a different way to signal the
2493 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2494 * does not work with MT, hence we can only transfer one head at
2497 static void virtualdmabug_workaround(void)
2502 if (CT(COMMAND) == FD_WRITE) {
2503 COMMAND &= ~0x80; /* switch off multiple track mode */
2505 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2506 end_sector = SECTOR + hard_sectors - 1;
2507 if (end_sector > SECT_PER_TRACK) {
2508 pr_info("too many sectors %d > %d\n",
2509 end_sector, SECT_PER_TRACK);
2512 SECT_PER_TRACK = end_sector;
2513 /* make sure SECT_PER_TRACK
2514 * points to end of transfer */
2519 * Formulate a read/write request.
2520 * this routine decides where to load the data (directly to buffer, or to
2521 * tmp floppy area), how much data to load (the size of the buffer, the whole
2522 * track, or a single sector)
2523 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2524 * allocation on the fly, it should be done here. No other part should need
2528 static int make_raw_rw_request(void)
2530 int aligned_sector_t;
2536 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2539 set_fdc((long)current_req->rq_disk->private_data);
2541 raw_cmd = &default_raw_cmd;
2542 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2543 raw_cmd->cmd_count = NR_RW;
2544 if (rq_data_dir(current_req) == READ) {
2545 raw_cmd->flags |= FD_RAW_READ;
2546 COMMAND = FM_MODE(_floppy, FD_READ);
2547 } else if (rq_data_dir(current_req) == WRITE) {
2548 raw_cmd->flags |= FD_RAW_WRITE;
2549 COMMAND = FM_MODE(_floppy, FD_WRITE);
2551 DPRINT("%s: unknown command\n", __func__);
2555 max_sector = _floppy->sect * _floppy->head;
2557 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2558 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2559 if (_floppy->track && TRACK >= _floppy->track) {
2560 if (blk_rq_cur_sectors(current_req) & 1) {
2561 current_count_sectors = 1;
2566 HEAD = fsector_t / _floppy->sect;
2568 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2569 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2570 fsector_t < _floppy->sect)
2571 max_sector = _floppy->sect;
2573 /* 2M disks have phantom sectors on the first track */
2574 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2575 max_sector = 2 * _floppy->sect / 3;
2576 if (fsector_t >= max_sector) {
2577 current_count_sectors =
2578 min_t(int, _floppy->sect - fsector_t,
2579 blk_rq_sectors(current_req));
2584 SIZECODE = FD_SIZECODE(_floppy);
2585 raw_cmd->rate = _floppy->rate & 0x43;
2586 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2593 raw_cmd->track = TRACK << STRETCH(_floppy);
2594 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2596 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2597 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2598 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2599 FD_SECTBASE(_floppy);
2601 /* tracksize describes the size which can be filled up with sectors
2604 tracksize = _floppy->sect - _floppy->sect % ssize;
2605 if (tracksize < _floppy->sect) {
2607 if (tracksize <= fsector_t % _floppy->sect)
2610 /* if we are beyond tracksize, fill up using smaller sectors */
2611 while (tracksize <= fsector_t % _floppy->sect) {
2612 while (tracksize + ssize > _floppy->sect) {
2620 max_sector = HEAD * _floppy->sect + tracksize;
2621 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2622 max_sector = _floppy->sect;
2623 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2624 /* for virtual DMA bug workaround */
2625 max_sector = _floppy->sect;
2628 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2629 aligned_sector_t = fsector_t - in_sector_offset;
2630 max_size = blk_rq_sectors(current_req);
2631 if ((raw_cmd->track == buffer_track) &&
2632 (current_drive == buffer_drive) &&
2633 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2634 /* data already in track buffer */
2635 if (CT(COMMAND) == FD_READ) {
2636 copy_buffer(1, max_sector, buffer_max);
2639 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2640 if (CT(COMMAND) == FD_WRITE) {
2641 unsigned int sectors;
2643 sectors = fsector_t + blk_rq_sectors(current_req);
2644 if (sectors > ssize && sectors < ssize + ssize)
2645 max_size = ssize + ssize;
2649 raw_cmd->flags &= ~FD_RAW_WRITE;
2650 raw_cmd->flags |= FD_RAW_READ;
2651 COMMAND = FM_MODE(_floppy, FD_READ);
2652 } else if ((unsigned long)bio_data(current_req->bio) < MAX_DMA_ADDRESS) {
2653 unsigned long dma_limit;
2654 int direct, indirect;
2657 transfer_size(ssize, max_sector,
2658 max_buffer_sectors * 2) - fsector_t;
2661 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2662 * on a 64 bit machine!
2664 max_size = buffer_chain_size();
2665 dma_limit = (MAX_DMA_ADDRESS -
2666 ((unsigned long)bio_data(current_req->bio))) >> 9;
2667 if ((unsigned long)max_size > dma_limit)
2668 max_size = dma_limit;
2669 /* 64 kb boundaries */
2670 if (CROSS_64KB(bio_data(current_req->bio), max_size << 9))
2672 ((unsigned long)bio_data(current_req->bio)) %
2674 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2676 * We try to read tracks, but if we get too many errors, we
2677 * go back to reading just one sector at a time.
2679 * This means we should be able to read a sector even if there
2680 * are other bad sectors on this track.
2683 (indirect * 2 > direct * 3 &&
2684 *errors < DP->max_errors.read_track &&
2686 (DP->read_track & (1 << DRS->probed_format)))))) {
2687 max_size = blk_rq_sectors(current_req);
2689 raw_cmd->kernel_data = bio_data(current_req->bio);
2690 raw_cmd->length = current_count_sectors << 9;
2691 if (raw_cmd->length == 0) {
2692 DPRINT("%s: zero dma transfer attempted\n", __func__);
2693 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2694 indirect, direct, fsector_t);
2697 virtualdmabug_workaround();
2702 if (CT(COMMAND) == FD_READ)
2703 max_size = max_sector; /* unbounded */
2705 /* claim buffer track if needed */
2706 if (buffer_track != raw_cmd->track || /* bad track */
2707 buffer_drive != current_drive || /* bad drive */
2708 fsector_t > buffer_max ||
2709 fsector_t < buffer_min ||
2710 ((CT(COMMAND) == FD_READ ||
2711 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2712 max_sector > 2 * max_buffer_sectors + buffer_min &&
2713 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2714 /* not enough space */
2716 buffer_drive = current_drive;
2717 buffer_max = buffer_min = aligned_sector_t;
2719 raw_cmd->kernel_data = floppy_track_buffer +
2720 ((aligned_sector_t - buffer_min) << 9);
2722 if (CT(COMMAND) == FD_WRITE) {
2723 /* copy write buffer to track buffer.
2724 * if we get here, we know that the write
2725 * is either aligned or the data already in the buffer
2726 * (buffer will be overwritten) */
2727 if (in_sector_offset && buffer_track == -1)
2728 DPRINT("internal error offset !=0 on write\n");
2729 buffer_track = raw_cmd->track;
2730 buffer_drive = current_drive;
2731 copy_buffer(ssize, max_sector,
2732 2 * max_buffer_sectors + buffer_min);
2734 transfer_size(ssize, max_sector,
2735 2 * max_buffer_sectors + buffer_min -
2738 /* round up current_count_sectors to get dma xfer size */
2739 raw_cmd->length = in_sector_offset + current_count_sectors;
2740 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2741 raw_cmd->length <<= 9;
2742 if ((raw_cmd->length < current_count_sectors << 9) ||
2743 (raw_cmd->kernel_data != bio_data(current_req->bio) &&
2744 CT(COMMAND) == FD_WRITE &&
2745 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2746 aligned_sector_t < buffer_min)) ||
2747 raw_cmd->length % (128 << SIZECODE) ||
2748 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2749 DPRINT("fractionary current count b=%lx s=%lx\n",
2750 raw_cmd->length, current_count_sectors);
2751 if (raw_cmd->kernel_data != bio_data(current_req->bio))
2752 pr_info("addr=%d, length=%ld\n",
2753 (int)((raw_cmd->kernel_data -
2754 floppy_track_buffer) >> 9),
2755 current_count_sectors);
2756 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2757 fsector_t, aligned_sector_t, max_sector, max_size);
2758 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2759 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2760 COMMAND, SECTOR, HEAD, TRACK);
2761 pr_info("buffer drive=%d\n", buffer_drive);
2762 pr_info("buffer track=%d\n", buffer_track);
2763 pr_info("buffer_min=%d\n", buffer_min);
2764 pr_info("buffer_max=%d\n", buffer_max);
2768 if (raw_cmd->kernel_data != bio_data(current_req->bio)) {
2769 if (raw_cmd->kernel_data < floppy_track_buffer ||
2770 current_count_sectors < 0 ||
2771 raw_cmd->length < 0 ||
2772 raw_cmd->kernel_data + raw_cmd->length >
2773 floppy_track_buffer + (max_buffer_sectors << 10)) {
2774 DPRINT("buffer overrun in schedule dma\n");
2775 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2776 fsector_t, buffer_min, raw_cmd->length >> 9);
2777 pr_info("current_count_sectors=%ld\n",
2778 current_count_sectors);
2779 if (CT(COMMAND) == FD_READ)
2781 if (CT(COMMAND) == FD_WRITE)
2785 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2786 current_count_sectors > blk_rq_sectors(current_req)) {
2787 DPRINT("buffer overrun in direct transfer\n");
2789 } else if (raw_cmd->length < current_count_sectors << 9) {
2790 DPRINT("more sectors than bytes\n");
2791 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2792 pr_info("sectors=%ld\n", current_count_sectors);
2794 if (raw_cmd->length == 0) {
2795 DPRINT("zero dma transfer attempted from make_raw_request\n");
2799 virtualdmabug_workaround();
2804 * Round-robin between our available drives, doing one request from each
2806 static int set_next_request(void)
2808 struct request_queue *q;
2809 int old_pos = fdc_queue;
2812 q = disks[fdc_queue]->queue;
2813 if (++fdc_queue == N_DRIVE)
2816 current_req = blk_fetch_request(q);
2818 current_req->error_count = 0;
2822 } while (fdc_queue != old_pos);
2824 return current_req != NULL;
2827 static void redo_fd_request(void)
2833 if (current_drive < N_DRIVE)
2834 floppy_off(current_drive);
2840 spin_lock_irq(&floppy_lock);
2841 pending = set_next_request();
2842 spin_unlock_irq(&floppy_lock);
2849 drive = (long)current_req->rq_disk->private_data;
2851 reschedule_timeout(current_reqD, "redo fd request");
2854 raw_cmd = &default_raw_cmd;
2856 if (start_motor(redo_fd_request))
2859 disk_change(current_drive);
2860 if (test_bit(current_drive, &fake_change) ||
2861 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2862 DPRINT("disk absent or changed during operation\n");
2866 if (!_floppy) { /* Autodetection */
2868 DRS->probed_format = 0;
2869 if (next_valid_format()) {
2870 DPRINT("no autodetectable formats\n");
2877 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2880 errors = &(current_req->error_count);
2881 tmp = make_raw_rw_request();
2887 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2889 schedule_bh(floppy_start);
2890 debugt(__func__, "queue fd request");
2894 static const struct cont_t rw_cont = {
2895 .interrupt = rw_interrupt,
2896 .redo = redo_fd_request,
2897 .error = bad_flp_intr,
2898 .done = request_done
2901 static void process_fd_request(void)
2904 schedule_bh(redo_fd_request);
2907 static void do_fd_request(struct request_queue *q)
2909 if (WARN(max_buffer_sectors == 0,
2910 "VFS: %s called on non-open device\n", __func__))
2913 if (WARN(atomic_read(&usage_count) == 0,
2914 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n",
2915 current_req, (long)blk_rq_pos(current_req),
2916 (unsigned long long) current_req->cmd_flags))
2919 if (test_and_set_bit(0, &fdc_busy)) {
2920 /* fdc busy, this new request will be treated when the
2921 current one is done */
2922 is_alive(__func__, "old request running");
2925 command_status = FD_COMMAND_NONE;
2926 __reschedule_timeout(MAXTIMEOUT, "fd_request");
2928 process_fd_request();
2929 is_alive(__func__, "");
2932 static const struct cont_t poll_cont = {
2933 .interrupt = success_and_wakeup,
2934 .redo = floppy_ready,
2935 .error = generic_failure,
2936 .done = generic_done
2939 static int poll_drive(bool interruptible, int flag)
2941 /* no auto-sense, just clear dcl */
2942 raw_cmd = &default_raw_cmd;
2943 raw_cmd->flags = flag;
2945 raw_cmd->cmd_count = 0;
2947 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2948 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2950 return wait_til_done(floppy_ready, interruptible);
2954 * User triggered reset
2955 * ====================
2958 static void reset_intr(void)
2960 pr_info("weird, reset interrupt called\n");
2963 static const struct cont_t reset_cont = {
2964 .interrupt = reset_intr,
2965 .redo = success_and_wakeup,
2966 .error = generic_failure,
2967 .done = generic_done
2970 static int user_reset_fdc(int drive, int arg, bool interruptible)
2974 if (lock_fdc(drive))
2977 if (arg == FD_RESET_ALWAYS)
2981 ret = wait_til_done(reset_fdc, interruptible);
2985 process_fd_request();
2990 * Misc Ioctl's and support
2991 * ========================
2993 static inline int fd_copyout(void __user *param, const void *address,
2996 return copy_to_user(param, address, size) ? -EFAULT : 0;
2999 static inline int fd_copyin(void __user *param, void *address,
3002 return copy_from_user(address, param, size) ? -EFAULT : 0;
3005 static const char *drive_name(int type, int drive)
3007 struct floppy_struct *floppy;
3010 floppy = floppy_type + type;
3012 if (UDP->native_format)
3013 floppy = floppy_type + UDP->native_format;
3018 return floppy->name;
3024 static void raw_cmd_done(int flag)
3029 raw_cmd->flags |= FD_RAW_FAILURE;
3030 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3032 raw_cmd->reply_count = inr;
3033 if (raw_cmd->reply_count > MAX_REPLIES)
3034 raw_cmd->reply_count = 0;
3035 for (i = 0; i < raw_cmd->reply_count; i++)
3036 raw_cmd->reply[i] = reply_buffer[i];
3038 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3039 unsigned long flags;
3040 flags = claim_dma_lock();
3041 raw_cmd->length = fd_get_dma_residue();
3042 release_dma_lock(flags);
3045 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3046 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3047 raw_cmd->flags |= FD_RAW_FAILURE;
3049 if (disk_change(current_drive))
3050 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3052 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3053 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3054 motor_off_callback(&motor_off_timer[current_drive]);
3056 if (raw_cmd->next &&
3057 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3058 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3059 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3060 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3061 raw_cmd = raw_cmd->next;
3068 static const struct cont_t raw_cmd_cont = {
3069 .interrupt = success_and_wakeup,
3070 .redo = floppy_start,
3071 .error = generic_failure,
3072 .done = raw_cmd_done
3075 static int raw_cmd_copyout(int cmd, void __user *param,
3076 struct floppy_raw_cmd *ptr)
3081 struct floppy_raw_cmd cmd = *ptr;
3083 cmd.kernel_data = NULL;
3084 ret = copy_to_user(param, &cmd, sizeof(cmd));
3087 param += sizeof(struct floppy_raw_cmd);
3088 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3089 if (ptr->length >= 0 &&
3090 ptr->length <= ptr->buffer_length) {
3091 long length = ptr->buffer_length - ptr->length;
3092 ret = fd_copyout(ptr->data, ptr->kernel_data,
3104 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3106 struct floppy_raw_cmd *next;
3107 struct floppy_raw_cmd *this;
3112 if (this->buffer_length) {
3113 fd_dma_mem_free((unsigned long)this->kernel_data,
3114 this->buffer_length);
3115 this->buffer_length = 0;
3123 static int raw_cmd_copyin(int cmd, void __user *param,
3124 struct floppy_raw_cmd **rcmd)
3126 struct floppy_raw_cmd *ptr;
3133 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL);
3137 ret = copy_from_user(ptr, param, sizeof(*ptr));
3139 ptr->buffer_length = 0;
3140 ptr->kernel_data = NULL;
3143 param += sizeof(struct floppy_raw_cmd);
3144 if (ptr->cmd_count > 33)
3145 /* the command may now also take up the space
3146 * initially intended for the reply & the
3147 * reply count. Needed for long 82078 commands
3148 * such as RESTORE, which takes ... 17 command
3149 * bytes. Murphy's law #137: When you reserve
3150 * 16 bytes for a structure, you'll one day
3151 * discover that you really need 17...
3155 for (i = 0; i < 16; i++)
3157 ptr->resultcode = 0;
3159 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3160 if (ptr->length <= 0)
3162 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3163 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3164 if (!ptr->kernel_data)
3166 ptr->buffer_length = ptr->length;
3168 if (ptr->flags & FD_RAW_WRITE) {
3169 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3174 if (ptr->flags & FD_RAW_MORE) {
3175 rcmd = &(ptr->next);
3183 static int raw_cmd_ioctl(int cmd, void __user *param)
3185 struct floppy_raw_cmd *my_raw_cmd;
3190 if (FDCS->rawcmd <= 1)
3192 for (drive = 0; drive < N_DRIVE; drive++) {
3193 if (FDC(drive) != fdc)
3195 if (drive == current_drive) {
3196 if (UDRS->fd_ref > 1) {
3200 } else if (UDRS->fd_ref) {
3209 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3211 raw_cmd_free(&my_raw_cmd);
3215 raw_cmd = my_raw_cmd;
3216 cont = &raw_cmd_cont;
3217 ret = wait_til_done(floppy_start, true);
3218 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3220 if (ret != -EINTR && FDCS->reset)
3223 DRS->track = NO_TRACK;
3225 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3228 raw_cmd_free(&my_raw_cmd);
3232 static int invalidate_drive(struct block_device *bdev)
3234 /* invalidate the buffer track to force a reread */
3235 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3236 process_fd_request();
3237 check_disk_change(bdev);
3241 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3242 int drive, int type, struct block_device *bdev)
3246 /* sanity checking for parameters. */
3249 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3250 /* check if reserved bits are set */
3251 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3254 if (!capable(CAP_SYS_ADMIN))
3256 mutex_lock(&open_lock);
3257 if (lock_fdc(drive)) {
3258 mutex_unlock(&open_lock);
3261 floppy_type[type] = *g;
3262 floppy_type[type].name = "user format";
3263 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3264 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3265 floppy_type[type].size + 1;
3266 process_fd_request();
3267 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3268 struct block_device *bdev = opened_bdev[cnt];
3269 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3271 __invalidate_device(bdev, true);
3273 mutex_unlock(&open_lock);
3277 if (lock_fdc(drive))
3279 if (cmd != FDDEFPRM) {
3280 /* notice a disk change immediately, else
3281 * we lose our settings immediately*/
3282 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3285 oldStretch = g->stretch;
3286 user_params[drive] = *g;
3287 if (buffer_drive == drive)
3288 SUPBOUND(buffer_max, user_params[drive].sect);
3289 current_type[drive] = &user_params[drive];
3290 floppy_sizes[drive] = user_params[drive].size;
3291 if (cmd == FDDEFPRM)
3292 DRS->keep_data = -1;
3295 /* invalidation. Invalidate only when needed, i.e.
3296 * when there are already sectors in the buffer cache
3297 * whose number will change. This is useful, because
3298 * mtools often changes the geometry of the disk after
3299 * looking at the boot block */
3300 if (DRS->maxblock > user_params[drive].sect ||
3302 ((user_params[drive].sect ^ oldStretch) &
3303 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3304 invalidate_drive(bdev);
3306 process_fd_request();
3311 /* handle obsolete ioctl's */
3312 static unsigned int ioctl_table[] = {
3340 static int normalize_ioctl(unsigned int *cmd, int *size)
3344 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3345 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3346 *size = _IOC_SIZE(*cmd);
3347 *cmd = ioctl_table[i];
3348 if (*size > _IOC_SIZE(*cmd)) {
3349 pr_info("ioctl not yet supported\n");
3358 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3361 *g = &floppy_type[type];
3363 if (lock_fdc(drive))
3365 if (poll_drive(false, 0) == -EINTR)
3367 process_fd_request();
3368 *g = current_type[drive];
3375 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3377 int drive = (long)bdev->bd_disk->private_data;
3378 int type = ITYPE(drive_state[drive].fd_device);
3379 struct floppy_struct *g;
3382 ret = get_floppy_geometry(drive, type, &g);
3386 geo->heads = g->head;
3387 geo->sectors = g->sect;
3388 geo->cylinders = g->track;
3392 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3393 unsigned long param)
3395 int drive = (long)bdev->bd_disk->private_data;
3396 int type = ITYPE(UDRS->fd_device);
3401 struct floppy_struct g; /* geometry */
3402 struct format_descr f;
3403 struct floppy_max_errors max_errors;
3404 struct floppy_drive_params dp;
3405 } inparam; /* parameters coming from user space */
3406 const void *outparam; /* parameters passed back to user space */
3408 /* convert compatibility eject ioctls into floppy eject ioctl.
3409 * We do this in order to provide a means to eject floppy disks before
3410 * installing the new fdutils package */
3411 if (cmd == CDROMEJECT || /* CD-ROM eject */
3412 cmd == 0x6470) { /* SunOS floppy eject */
3413 DPRINT("obsolete eject ioctl\n");
3414 DPRINT("please use floppycontrol --eject\n");
3418 if (!((cmd & 0xff00) == 0x0200))
3421 /* convert the old style command into a new style command */
3422 ret = normalize_ioctl(&cmd, &size);
3426 /* permission checks */
3427 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3428 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3431 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3435 memset(&inparam, 0, sizeof(inparam));
3436 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3437 ret = fd_copyin((void __user *)param, &inparam, size);
3444 if (UDRS->fd_ref != 1)
3445 /* somebody else has this drive open */
3447 if (lock_fdc(drive))
3450 /* do the actual eject. Fails on
3451 * non-Sparc architectures */
3452 ret = fd_eject(UNIT(drive));
3454 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3455 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3456 process_fd_request();
3459 if (lock_fdc(drive))
3461 current_type[drive] = NULL;
3462 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3463 UDRS->keep_data = 0;
3464 return invalidate_drive(bdev);
3467 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3469 ret = get_floppy_geometry(drive, type,
3470 (struct floppy_struct **)&outparam);
3475 UDP->flags |= FTD_MSG;
3478 UDP->flags &= ~FTD_MSG;
3481 if (lock_fdc(drive))
3483 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3486 process_fd_request();
3487 if (ret & FD_VERIFY)
3489 if (!(ret & FD_DISK_WRITABLE))
3493 if (UDRS->fd_ref != 1)
3495 return do_format(drive, &inparam.f);
3498 if (lock_fdc(drive))
3500 return invalidate_drive(bdev);
3501 case FDSETEMSGTRESH:
3502 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3505 outparam = &UDP->max_errors;
3508 UDP->max_errors = inparam.max_errors;
3511 outparam = drive_name(type, drive);
3512 SUPBOUND(size, strlen((const char *)outparam) + 1);
3521 if (lock_fdc(drive))
3523 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3525 process_fd_request();
3531 return user_reset_fdc(drive, (int)param, true);
3536 memset(UDRWE, 0, sizeof(*UDRWE));
3544 if (lock_fdc(drive))
3547 i = raw_cmd_ioctl(cmd, (void __user *)param);
3550 process_fd_request();
3553 if (lock_fdc(drive))
3556 process_fd_request();
3562 if (_IOC_DIR(cmd) & _IOC_READ)
3563 return fd_copyout((void __user *)param, outparam, size);
3568 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3569 unsigned int cmd, unsigned long param)
3573 mutex_lock(&floppy_mutex);
3574 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3575 mutex_unlock(&floppy_mutex);
3580 #ifdef CONFIG_COMPAT
3582 struct compat_floppy_drive_params {
3584 compat_ulong_t max_dtr;
3588 compat_ulong_t spinup;
3589 compat_ulong_t spindown;
3590 unsigned char spindown_offset;
3591 unsigned char select_delay;
3593 unsigned char tracks;
3594 compat_ulong_t timeout;
3595 unsigned char interleave_sect;
3596 struct floppy_max_errors max_errors;
3599 short autodetect[8];
3600 compat_int_t checkfreq;
3601 compat_int_t native_format;
3604 struct compat_floppy_drive_struct {
3606 compat_ulong_t spinup_date;
3607 compat_ulong_t select_date;
3608 compat_ulong_t first_read_date;
3609 short probed_format;
3613 compat_int_t generation;
3614 compat_int_t keep_data;
3615 compat_int_t fd_ref;
3616 compat_int_t fd_device;
3617 compat_int_t last_checked;
3618 compat_caddr_t dmabuf;
3619 compat_int_t bufblocks;
3622 struct compat_floppy_fdc_state {
3626 unsigned char version;
3628 compat_ulong_t address;
3629 unsigned int rawcmd:2;
3630 unsigned int reset:1;
3631 unsigned int need_configure:1;
3632 unsigned int perp_mode:2;
3633 unsigned int has_fifo:1;
3634 unsigned int driver_version;
3635 unsigned char track[4];
3638 struct compat_floppy_write_errors {
3639 unsigned int write_errors;
3640 compat_ulong_t first_error_sector;
3641 compat_int_t first_error_generation;
3642 compat_ulong_t last_error_sector;
3643 compat_int_t last_error_generation;
3644 compat_uint_t badness;
3647 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
3648 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
3649 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
3650 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
3651 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
3652 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
3653 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
3654 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
3656 static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3657 struct compat_floppy_struct __user *arg)
3659 struct floppy_struct v;
3663 BUILD_BUG_ON(offsetof(struct floppy_struct, name) !=
3664 offsetof(struct compat_floppy_struct, name));
3666 if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL)))
3669 memset(&v, 0, sizeof(struct floppy_struct));
3670 if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name)))
3673 mutex_lock(&floppy_mutex);
3674 drive = (long)bdev->bd_disk->private_data;
3675 type = ITYPE(UDRS->fd_device);
3676 err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM,
3677 &v, drive, type, bdev);
3678 mutex_unlock(&floppy_mutex);
3682 static int compat_get_prm(int drive,
3683 struct compat_floppy_struct __user *arg)
3685 struct compat_floppy_struct v;
3686 struct floppy_struct *p;
3689 memset(&v, 0, sizeof(v));
3690 mutex_lock(&floppy_mutex);
3691 err = get_floppy_geometry(drive, ITYPE(UDRS->fd_device), &p);
3693 mutex_unlock(&floppy_mutex);
3696 memcpy(&v, p, offsetof(struct floppy_struct, name));
3697 mutex_unlock(&floppy_mutex);
3698 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct)))
3703 static int compat_setdrvprm(int drive,
3704 struct compat_floppy_drive_params __user *arg)
3706 struct compat_floppy_drive_params v;
3708 if (!capable(CAP_SYS_ADMIN))
3710 if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params)))
3712 mutex_lock(&floppy_mutex);
3714 UDP->max_dtr = v.max_dtr;
3718 UDP->spinup = v.spinup;
3719 UDP->spindown = v.spindown;
3720 UDP->spindown_offset = v.spindown_offset;
3721 UDP->select_delay = v.select_delay;
3723 UDP->tracks = v.tracks;
3724 UDP->timeout = v.timeout;
3725 UDP->interleave_sect = v.interleave_sect;
3726 UDP->max_errors = v.max_errors;
3727 UDP->flags = v.flags;
3728 UDP->read_track = v.read_track;
3729 memcpy(UDP->autodetect, v.autodetect, sizeof(v.autodetect));
3730 UDP->checkfreq = v.checkfreq;
3731 UDP->native_format = v.native_format;
3732 mutex_unlock(&floppy_mutex);
3736 static int compat_getdrvprm(int drive,
3737 struct compat_floppy_drive_params __user *arg)
3739 struct compat_floppy_drive_params v;
3741 memset(&v, 0, sizeof(struct compat_floppy_drive_params));
3742 mutex_lock(&floppy_mutex);
3744 v.max_dtr = UDP->max_dtr;
3748 v.spinup = UDP->spinup;
3749 v.spindown = UDP->spindown;
3750 v.spindown_offset = UDP->spindown_offset;
3751 v.select_delay = UDP->select_delay;
3753 v.tracks = UDP->tracks;
3754 v.timeout = UDP->timeout;
3755 v.interleave_sect = UDP->interleave_sect;
3756 v.max_errors = UDP->max_errors;
3757 v.flags = UDP->flags;
3758 v.read_track = UDP->read_track;
3759 memcpy(v.autodetect, UDP->autodetect, sizeof(v.autodetect));
3760 v.checkfreq = UDP->checkfreq;
3761 v.native_format = UDP->native_format;
3762 mutex_unlock(&floppy_mutex);
3764 if (copy_from_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
3769 static int compat_getdrvstat(int drive, bool poll,
3770 struct compat_floppy_drive_struct __user *arg)
3772 struct compat_floppy_drive_struct v;
3774 memset(&v, 0, sizeof(struct compat_floppy_drive_struct));
3775 mutex_lock(&floppy_mutex);
3778 if (lock_fdc(drive))
3780 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3782 process_fd_request();
3784 v.spinup_date = UDRS->spinup_date;
3785 v.select_date = UDRS->select_date;
3786 v.first_read_date = UDRS->first_read_date;
3787 v.probed_format = UDRS->probed_format;
3788 v.track = UDRS->track;
3789 v.maxblock = UDRS->maxblock;
3790 v.maxtrack = UDRS->maxtrack;
3791 v.generation = UDRS->generation;
3792 v.keep_data = UDRS->keep_data;
3793 v.fd_ref = UDRS->fd_ref;
3794 v.fd_device = UDRS->fd_device;
3795 v.last_checked = UDRS->last_checked;
3796 v.dmabuf = (uintptr_t)UDRS->dmabuf;
3797 v.bufblocks = UDRS->bufblocks;
3798 mutex_unlock(&floppy_mutex);
3800 if (copy_from_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
3804 mutex_unlock(&floppy_mutex);
3808 static int compat_getfdcstat(int drive,
3809 struct compat_floppy_fdc_state __user *arg)
3811 struct compat_floppy_fdc_state v32;
3812 struct floppy_fdc_state v;
3814 mutex_lock(&floppy_mutex);
3816 mutex_unlock(&floppy_mutex);
3818 memset(&v32, 0, sizeof(struct compat_floppy_fdc_state));
3819 v32.spec1 = v.spec1;
3820 v32.spec2 = v.spec2;
3822 v32.version = v.version;
3824 v32.address = v.address;
3825 v32.rawcmd = v.rawcmd;
3826 v32.reset = v.reset;
3827 v32.need_configure = v.need_configure;
3828 v32.perp_mode = v.perp_mode;
3829 v32.has_fifo = v.has_fifo;
3830 v32.driver_version = v.driver_version;
3831 memcpy(v32.track, v.track, 4);
3832 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state)))
3837 static int compat_werrorget(int drive,
3838 struct compat_floppy_write_errors __user *arg)
3840 struct compat_floppy_write_errors v32;
3841 struct floppy_write_errors v;
3843 memset(&v32, 0, sizeof(struct compat_floppy_write_errors));
3844 mutex_lock(&floppy_mutex);
3846 mutex_unlock(&floppy_mutex);
3847 v32.write_errors = v.write_errors;
3848 v32.first_error_sector = v.first_error_sector;
3849 v32.first_error_generation = v.first_error_generation;
3850 v32.last_error_sector = v.last_error_sector;
3851 v32.last_error_generation = v.last_error_generation;
3852 v32.badness = v.badness;
3853 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors)))
3858 static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3859 unsigned long param)
3861 int drive = (long)bdev->bd_disk->private_data;
3865 case FDSETEMSGTRESH:
3873 return fd_ioctl(bdev, mode, cmd, param);
3880 return fd_ioctl(bdev, mode, cmd,
3881 (unsigned long)compat_ptr(param));
3884 return compat_set_geometry(bdev, mode, cmd, compat_ptr(param));
3886 return compat_get_prm(drive, compat_ptr(param));
3888 return compat_setdrvprm(drive, compat_ptr(param));
3890 return compat_getdrvprm(drive, compat_ptr(param));
3891 case FDPOLLDRVSTAT32:
3892 return compat_getdrvstat(drive, true, compat_ptr(param));
3893 case FDGETDRVSTAT32:
3894 return compat_getdrvstat(drive, false, compat_ptr(param));
3895 case FDGETFDCSTAT32:
3896 return compat_getfdcstat(drive, compat_ptr(param));
3898 return compat_werrorget(drive, compat_ptr(param));
3904 static void __init config_types(void)
3906 bool has_drive = false;
3909 /* read drive info out of physical CMOS */
3912 UDP->cmos = FLOPPY0_TYPE;
3914 if (!UDP->cmos && FLOPPY1_TYPE)
3915 UDP->cmos = FLOPPY1_TYPE;
3917 /* FIXME: additional physical CMOS drive detection should go here */
3919 for (drive = 0; drive < N_DRIVE; drive++) {
3920 unsigned int type = UDP->cmos;
3921 struct floppy_drive_params *params;
3922 const char *name = NULL;
3925 if (type < ARRAY_SIZE(default_drive_params)) {
3926 params = &default_drive_params[type].params;
3928 name = default_drive_params[type].name;
3929 allowed_drive_mask |= 1 << drive;
3931 allowed_drive_mask &= ~(1 << drive);
3933 params = &default_drive_params[0].params;
3934 snprintf(temparea, sizeof(temparea),
3935 "unknown type %d (usb?)", type);
3939 const char *prepend;
3943 pr_info("Floppy drive(s):");
3948 pr_cont("%s fd%d is %s", prepend, drive, name);
3957 static void floppy_release(struct gendisk *disk, fmode_t mode)
3959 int drive = (long)disk->private_data;
3961 mutex_lock(&floppy_mutex);
3962 mutex_lock(&open_lock);
3963 if (!UDRS->fd_ref--) {
3964 DPRINT("floppy_release with fd_ref == 0");
3968 opened_bdev[drive] = NULL;
3969 mutex_unlock(&open_lock);
3970 mutex_unlock(&floppy_mutex);
3974 * floppy_open check for aliasing (/dev/fd0 can be the same as
3975 * /dev/PS0 etc), and disallows simultaneous access to the same
3976 * drive with different device numbers.
3978 static int floppy_open(struct block_device *bdev, fmode_t mode)
3980 int drive = (long)bdev->bd_disk->private_data;
3981 int old_dev, new_dev;
3986 mutex_lock(&floppy_mutex);
3987 mutex_lock(&open_lock);
3988 old_dev = UDRS->fd_device;
3989 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3992 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3993 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3994 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3999 opened_bdev[drive] = bdev;
4003 if (!floppy_track_buffer) {
4004 /* if opening an ED drive, reserve a big buffer,
4005 * else reserve a small one */
4006 if ((UDP->cmos == 6) || (UDP->cmos == 5))
4007 try = 64; /* Only 48 actually useful */
4009 try = 32; /* Only 24 actually useful */
4011 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4012 if (!tmp && !floppy_track_buffer) {
4013 try >>= 1; /* buffer only one side */
4015 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4017 if (!tmp && !floppy_track_buffer)
4018 fallback_on_nodma_alloc(&tmp, 2048 * try);
4019 if (!tmp && !floppy_track_buffer) {
4020 DPRINT("Unable to allocate DMA memory\n");
4023 if (floppy_track_buffer) {
4025 fd_dma_mem_free((unsigned long)tmp, try * 1024);
4027 buffer_min = buffer_max = -1;
4028 floppy_track_buffer = tmp;
4029 max_buffer_sectors = try;
4033 new_dev = MINOR(bdev->bd_dev);
4034 UDRS->fd_device = new_dev;
4035 set_capacity(disks[drive], floppy_sizes[new_dev]);
4036 if (old_dev != -1 && old_dev != new_dev) {
4037 if (buffer_drive == drive)
4041 if (UFDCS->rawcmd == 1)
4044 if (!(mode & FMODE_NDELAY)) {
4045 if (mode & (FMODE_READ|FMODE_WRITE)) {
4046 UDRS->last_checked = 0;
4047 clear_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
4048 check_disk_change(bdev);
4049 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
4051 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags))
4055 if ((mode & FMODE_WRITE) &&
4056 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
4059 mutex_unlock(&open_lock);
4060 mutex_unlock(&floppy_mutex);
4066 opened_bdev[drive] = NULL;
4068 mutex_unlock(&open_lock);
4069 mutex_unlock(&floppy_mutex);
4074 * Check if the disk has been changed or if a change has been faked.
4076 static unsigned int floppy_check_events(struct gendisk *disk,
4077 unsigned int clearing)
4079 int drive = (long)disk->private_data;
4081 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4082 test_bit(FD_VERIFY_BIT, &UDRS->flags))
4083 return DISK_EVENT_MEDIA_CHANGE;
4085 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
4086 if (lock_fdc(drive))
4088 poll_drive(false, 0);
4089 process_fd_request();
4092 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4093 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
4094 test_bit(drive, &fake_change) ||
4095 drive_no_geom(drive))
4096 return DISK_EVENT_MEDIA_CHANGE;
4101 * This implements "read block 0" for floppy_revalidate().
4102 * Needed for format autodetection, checking whether there is
4103 * a disk in the drive, and whether that disk is writable.
4108 struct completion complete;
4111 static void floppy_rb0_cb(struct bio *bio)
4113 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private;
4114 int drive = cbdata->drive;
4116 if (bio->bi_status) {
4117 pr_info("floppy: error %d while reading block 0\n",
4119 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
4121 complete(&cbdata->complete);
4124 static int __floppy_read_block_0(struct block_device *bdev, int drive)
4127 struct bio_vec bio_vec;
4129 struct rb0_cbdata cbdata;
4132 page = alloc_page(GFP_NOIO);
4134 process_fd_request();
4138 size = bdev->bd_block_size;
4142 cbdata.drive = drive;
4144 bio_init(&bio, &bio_vec, 1);
4145 bio_set_dev(&bio, bdev);
4146 bio_add_page(&bio, page, size, 0);
4148 bio.bi_iter.bi_sector = 0;
4149 bio.bi_flags |= (1 << BIO_QUIET);
4150 bio.bi_private = &cbdata;
4151 bio.bi_end_io = floppy_rb0_cb;
4152 bio_set_op_attrs(&bio, REQ_OP_READ, 0);
4155 process_fd_request();
4157 init_completion(&cbdata.complete);
4158 wait_for_completion(&cbdata.complete);
4165 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
4166 * the bootblock (block 0). "Autodetection" is also needed to check whether
4167 * there is a disk in the drive at all... Thus we also do it for fixed
4168 * geometry formats */
4169 static int floppy_revalidate(struct gendisk *disk)
4171 int drive = (long)disk->private_data;
4175 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4176 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
4177 test_bit(drive, &fake_change) ||
4178 drive_no_geom(drive)) {
4179 if (WARN(atomic_read(&usage_count) == 0,
4180 "VFS: revalidate called on non-open device.\n"))
4183 res = lock_fdc(drive);
4186 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4187 test_bit(FD_VERIFY_BIT, &UDRS->flags));
4188 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
4189 process_fd_request(); /*already done by another thread */
4194 if (buffer_drive == drive)
4196 clear_bit(drive, &fake_change);
4197 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4200 if (drive_no_geom(drive)) {
4202 res = __floppy_read_block_0(opened_bdev[drive], drive);
4205 poll_drive(false, FD_RAW_NEED_DISK);
4206 process_fd_request();
4209 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
4213 static const struct block_device_operations floppy_fops = {
4214 .owner = THIS_MODULE,
4215 .open = floppy_open,
4216 .release = floppy_release,
4218 .getgeo = fd_getgeo,
4219 .check_events = floppy_check_events,
4220 .revalidate_disk = floppy_revalidate,
4221 #ifdef CONFIG_COMPAT
4222 .compat_ioctl = fd_compat_ioctl,
4227 * Floppy Driver initialization
4228 * =============================
4231 /* Determine the floppy disk controller type */
4232 /* This routine was written by David C. Niemi */
4233 static char __init get_fdc_version(void)
4237 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
4242 return FDC_NONE; /* No FDC present ??? */
4243 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4244 pr_info("FDC %d is an 8272A\n", fdc);
4245 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
4248 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
4253 if (!fdc_configure()) {
4254 pr_info("FDC %d is an 82072\n", fdc);
4255 return FDC_82072; /* 82072 doesn't know CONFIGURE */
4258 output_byte(FD_PERPENDICULAR);
4259 if (need_more_output() == MORE_OUTPUT) {
4262 pr_info("FDC %d is an 82072A\n", fdc);
4263 return FDC_82072A; /* 82072A as found on Sparcs. */
4266 output_byte(FD_UNLOCK);
4268 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4269 pr_info("FDC %d is a pre-1991 82077\n", fdc);
4270 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
4273 if ((r != 1) || (reply_buffer[0] != 0x00)) {
4274 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
4278 output_byte(FD_PARTID);
4281 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
4285 if (reply_buffer[0] == 0x80) {
4286 pr_info("FDC %d is a post-1991 82077\n", fdc);
4287 return FDC_82077; /* Revised 82077AA passes all the tests */
4289 switch (reply_buffer[0] >> 5) {
4291 /* Either a 82078-1 or a 82078SL running at 5Volt */
4292 pr_info("FDC %d is an 82078.\n", fdc);
4295 pr_info("FDC %d is a 44pin 82078\n", fdc);
4298 pr_info("FDC %d is a S82078B\n", fdc);
4301 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
4304 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4305 fdc, reply_buffer[0] >> 5);
4306 return FDC_82078_UNKN;
4308 } /* get_fdc_version */
4310 /* lilo configuration */
4312 static void __init floppy_set_flags(int *ints, int param, int param2)
4316 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4318 default_drive_params[i].params.flags |= param2;
4320 default_drive_params[i].params.flags &= ~param2;
4322 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4325 static void __init daring(int *ints, int param, int param2)
4329 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4331 default_drive_params[i].params.select_delay = 0;
4332 default_drive_params[i].params.flags |=
4333 FD_SILENT_DCL_CLEAR;
4335 default_drive_params[i].params.select_delay =
4337 default_drive_params[i].params.flags &=
4338 ~FD_SILENT_DCL_CLEAR;
4341 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4344 static void __init set_cmos(int *ints, int dummy, int dummy2)
4346 int current_drive = 0;
4349 DPRINT("wrong number of parameters for CMOS\n");
4352 current_drive = ints[1];
4353 if (current_drive < 0 || current_drive >= 8) {
4354 DPRINT("bad drive for set_cmos\n");
4358 if (current_drive >= 4 && !FDC2)
4362 DPRINT("setting CMOS code to %d\n", ints[2]);
4365 static struct param_table {
4367 void (*fn) (int *ints, int param, int param2);
4371 } config_params[] __initdata = {
4372 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4373 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4374 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4375 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4376 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4377 {"daring", daring, NULL, 1, 0},
4379 {"two_fdc", NULL, &FDC2, 0x370, 0},
4380 {"one_fdc", NULL, &FDC2, 0, 0},
4382 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4383 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4384 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4385 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4386 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4387 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4388 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4389 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4390 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4391 {"nofifo", NULL, &no_fifo, 0x20, 0},
4392 {"usefifo", NULL, &no_fifo, 0, 0},
4393 {"cmos", set_cmos, NULL, 0, 0},
4394 {"slow", NULL, &slow_floppy, 1, 0},
4395 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4396 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4397 {"L40SX", NULL, &print_unex, 0, 0}
4402 static int __init floppy_setup(char *str)
4408 str = get_options(str, ARRAY_SIZE(ints), ints);
4410 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4411 if (strcmp(str, config_params[i].name) == 0) {
4415 param = config_params[i].def_param;
4416 if (config_params[i].fn)
4417 config_params[i].fn(ints, param,
4420 if (config_params[i].var) {
4421 DPRINT("%s=%d\n", str, param);
4422 *config_params[i].var = param;
4429 DPRINT("unknown floppy option [%s]\n", str);
4431 DPRINT("allowed options are:");
4432 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4433 pr_cont(" %s", config_params[i].name);
4436 DPRINT("botched floppy option\n");
4437 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4441 static int have_no_fdc = -ENODEV;
4443 static ssize_t floppy_cmos_show(struct device *dev,
4444 struct device_attribute *attr, char *buf)
4446 struct platform_device *p = to_platform_device(dev);
4450 return sprintf(buf, "%X\n", UDP->cmos);
4453 static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4455 static struct attribute *floppy_dev_attrs[] = {
4456 &dev_attr_cmos.attr,
4460 ATTRIBUTE_GROUPS(floppy_dev);
4462 static void floppy_device_release(struct device *dev)
4466 static int floppy_resume(struct device *dev)
4470 for (fdc = 0; fdc < N_FDC; fdc++)
4471 if (FDCS->address != -1)
4472 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4477 static const struct dev_pm_ops floppy_pm_ops = {
4478 .resume = floppy_resume,
4479 .restore = floppy_resume,
4482 static struct platform_driver floppy_driver = {
4485 .pm = &floppy_pm_ops,
4489 static struct platform_device floppy_device[N_DRIVE];
4491 static bool floppy_available(int drive)
4493 if (!(allowed_drive_mask & (1 << drive)))
4495 if (fdc_state[FDC(drive)].version == FDC_NONE)
4500 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4502 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4503 if (drive >= N_DRIVE || !floppy_available(drive))
4505 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4508 return get_disk_and_module(disks[drive]);
4511 static int __init do_floppy_init(void)
4513 int i, unit, drive, err;
4516 interruptjiffies = resultjiffies = jiffies;
4518 #if defined(CONFIG_PPC)
4519 if (check_legacy_ioport(FDC1))
4525 floppy_wq = alloc_ordered_workqueue("floppy", 0);
4529 for (drive = 0; drive < N_DRIVE; drive++) {
4530 disks[drive] = alloc_disk(1);
4531 if (!disks[drive]) {
4536 disks[drive]->queue = blk_init_queue(do_fd_request, &floppy_lock);
4537 if (!disks[drive]->queue) {
4542 blk_queue_bounce_limit(disks[drive]->queue, BLK_BOUNCE_HIGH);
4543 blk_queue_max_hw_sectors(disks[drive]->queue, 64);
4544 disks[drive]->major = FLOPPY_MAJOR;
4545 disks[drive]->first_minor = TOMINOR(drive);
4546 disks[drive]->fops = &floppy_fops;
4547 sprintf(disks[drive]->disk_name, "fd%d", drive);
4549 timer_setup(&motor_off_timer[drive], motor_off_callback, 0);
4552 err = register_blkdev(FLOPPY_MAJOR, "fd");
4556 err = platform_driver_register(&floppy_driver);
4558 goto out_unreg_blkdev;
4560 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4561 floppy_find, NULL, NULL);
4563 for (i = 0; i < 256; i++)
4565 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4567 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4569 reschedule_timeout(MAXTIMEOUT, "floppy init");
4572 for (i = 0; i < N_FDC; i++) {
4574 memset(FDCS, 0, sizeof(*FDCS));
4577 #if defined(__sparc__) || defined(__mc68000__)
4578 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4582 FDCS->version = FDC_82072A;
4586 use_virtual_dma = can_use_virtual_dma & 1;
4587 fdc_state[0].address = FDC1;
4588 if (fdc_state[0].address == -1) {
4589 cancel_delayed_work(&fd_timeout);
4591 goto out_unreg_region;
4594 fdc_state[1].address = FDC2;
4597 fdc = 0; /* reset fdc in case of unexpected interrupt */
4598 err = floppy_grab_irq_and_dma();
4600 cancel_delayed_work(&fd_timeout);
4602 goto out_unreg_region;
4605 /* initialise drive state */
4606 for (drive = 0; drive < N_DRIVE; drive++) {
4607 memset(UDRS, 0, sizeof(*UDRS));
4608 memset(UDRWE, 0, sizeof(*UDRWE));
4609 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4610 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4611 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4612 UDRS->fd_device = -1;
4613 floppy_track_buffer = NULL;
4614 max_buffer_sectors = 0;
4617 * Small 10 msec delay to let through any interrupt that
4618 * initialization might have triggered, to not
4619 * confuse detection:
4623 for (i = 0; i < N_FDC; i++) {
4625 FDCS->driver_version = FD_DRIVER_VERSION;
4626 for (unit = 0; unit < 4; unit++)
4627 FDCS->track[unit] = 0;
4628 if (FDCS->address == -1)
4631 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4632 /* free ioports reserved by floppy_grab_irq_and_dma() */
4633 floppy_release_regions(fdc);
4635 FDCS->version = FDC_NONE;
4638 /* Try to determine the floppy controller type */
4639 FDCS->version = get_fdc_version();
4640 if (FDCS->version == FDC_NONE) {
4641 /* free ioports reserved by floppy_grab_irq_and_dma() */
4642 floppy_release_regions(fdc);
4646 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4647 can_use_virtual_dma = 0;
4650 /* Not all FDCs seem to be able to handle the version command
4651 * properly, so force a reset for the standard FDC clones,
4652 * to avoid interrupt garbage.
4654 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4657 cancel_delayed_work(&fd_timeout);
4661 DPRINT("no floppy controllers found\n");
4663 goto out_release_dma;
4666 for (drive = 0; drive < N_DRIVE; drive++) {
4667 if (!floppy_available(drive))
4670 floppy_device[drive].name = floppy_device_name;
4671 floppy_device[drive].id = drive;
4672 floppy_device[drive].dev.release = floppy_device_release;
4673 floppy_device[drive].dev.groups = floppy_dev_groups;
4675 err = platform_device_register(&floppy_device[drive]);
4677 goto out_remove_drives;
4679 /* to be cleaned up... */
4680 disks[drive]->private_data = (void *)(long)drive;
4681 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4682 device_add_disk(&floppy_device[drive].dev, disks[drive]);
4689 if (floppy_available(drive)) {
4690 del_gendisk(disks[drive]);
4691 platform_device_unregister(&floppy_device[drive]);
4695 if (atomic_read(&usage_count))
4696 floppy_release_irq_and_dma();
4698 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4699 platform_driver_unregister(&floppy_driver);
4701 unregister_blkdev(FLOPPY_MAJOR, "fd");
4703 destroy_workqueue(floppy_wq);
4704 for (drive = 0; drive < N_DRIVE; drive++) {
4707 if (disks[drive]->queue) {
4708 del_timer_sync(&motor_off_timer[drive]);
4709 blk_cleanup_queue(disks[drive]->queue);
4710 disks[drive]->queue = NULL;
4712 put_disk(disks[drive]);
4718 static __init void floppy_async_init(void *data, async_cookie_t cookie)
4724 static int __init floppy_init(void)
4727 return do_floppy_init();
4729 /* Don't hold up the bootup by the floppy initialization */
4730 async_schedule(floppy_async_init, NULL);
4735 static const struct io_region {
4740 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4742 /* address + 6 is reserved, and may be taken by IDE.
4743 * Unfortunately, Adaptec doesn't know this :-(, */
4747 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4749 while (p != io_regions) {
4751 release_region(FDCS->address + p->offset, p->size);
4755 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4757 static int floppy_request_regions(int fdc)
4759 const struct io_region *p;
4761 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4762 if (!request_region(FDCS->address + p->offset,
4763 p->size, "floppy")) {
4764 DPRINT("Floppy io-port 0x%04lx in use\n",
4765 FDCS->address + p->offset);
4766 floppy_release_allocated_regions(fdc, p);
4773 static void floppy_release_regions(int fdc)
4775 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4778 static int floppy_grab_irq_and_dma(void)
4780 if (atomic_inc_return(&usage_count) > 1)
4784 * We might have scheduled a free_irq(), wait it to
4787 flush_workqueue(floppy_wq);
4789 if (fd_request_irq()) {
4790 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4792 atomic_dec(&usage_count);
4795 if (fd_request_dma()) {
4796 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4798 if (can_use_virtual_dma & 2)
4799 use_virtual_dma = can_use_virtual_dma = 1;
4800 if (!(can_use_virtual_dma & 1)) {
4802 atomic_dec(&usage_count);
4807 for (fdc = 0; fdc < N_FDC; fdc++) {
4808 if (FDCS->address != -1) {
4809 if (floppy_request_regions(fdc))
4813 for (fdc = 0; fdc < N_FDC; fdc++) {
4814 if (FDCS->address != -1) {
4816 fd_outb(FDCS->dor, FD_DOR);
4820 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4822 for (fdc = 0; fdc < N_FDC; fdc++)
4823 if (FDCS->address != -1)
4824 fd_outb(FDCS->dor, FD_DOR);
4826 * The driver will try and free resources and relies on us
4827 * to know if they were allocated or not.
4830 irqdma_allocated = 1;
4836 floppy_release_regions(fdc);
4837 atomic_dec(&usage_count);
4841 static void floppy_release_irq_and_dma(void)
4848 unsigned long tmpaddr;
4850 if (!atomic_dec_and_test(&usage_count))
4853 if (irqdma_allocated) {
4857 irqdma_allocated = 0;
4864 if (floppy_track_buffer && max_buffer_sectors) {
4865 tmpsize = max_buffer_sectors * 1024;
4866 tmpaddr = (unsigned long)floppy_track_buffer;
4867 floppy_track_buffer = NULL;
4868 max_buffer_sectors = 0;
4869 buffer_min = buffer_max = -1;
4870 fd_dma_mem_free(tmpaddr, tmpsize);
4873 for (drive = 0; drive < N_FDC * 4; drive++)
4874 if (timer_pending(motor_off_timer + drive))
4875 pr_info("motor off timer %d still active\n", drive);
4878 if (delayed_work_pending(&fd_timeout))
4879 pr_info("floppy timer still active:%s\n", timeout_message);
4880 if (delayed_work_pending(&fd_timer))
4881 pr_info("auxiliary floppy timer still active\n");
4882 if (work_pending(&floppy_work))
4883 pr_info("work still pending\n");
4885 for (fdc = 0; fdc < N_FDC; fdc++)
4886 if (FDCS->address != -1)
4887 floppy_release_regions(fdc);
4893 static char *floppy;
4895 static void __init parse_floppy_cfg_string(char *cfg)
4901 while (*cfg && *cfg != ' ' && *cfg != '\t')
4912 static int __init floppy_module_init(void)
4915 parse_floppy_cfg_string(floppy);
4916 return floppy_init();
4918 module_init(floppy_module_init);
4920 static void __exit floppy_module_exit(void)
4924 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4925 unregister_blkdev(FLOPPY_MAJOR, "fd");
4926 platform_driver_unregister(&floppy_driver);
4928 destroy_workqueue(floppy_wq);
4930 for (drive = 0; drive < N_DRIVE; drive++) {
4931 del_timer_sync(&motor_off_timer[drive]);
4933 if (floppy_available(drive)) {
4934 del_gendisk(disks[drive]);
4935 platform_device_unregister(&floppy_device[drive]);
4937 blk_cleanup_queue(disks[drive]->queue);
4940 * These disks have not called add_disk(). Don't put down
4941 * queue reference in put_disk().
4943 if (!(allowed_drive_mask & (1 << drive)) ||
4944 fdc_state[FDC(drive)].version == FDC_NONE)
4945 disks[drive]->queue = NULL;
4947 put_disk(disks[drive]);
4950 cancel_delayed_work_sync(&fd_timeout);
4951 cancel_delayed_work_sync(&fd_timer);
4953 if (atomic_read(&usage_count))
4954 floppy_release_irq_and_dma();
4956 /* eject disk, if any */
4960 module_exit(floppy_module_exit);
4962 module_param(floppy, charp, 0);
4963 module_param(FLOPPY_IRQ, int, 0);
4964 module_param(FLOPPY_DMA, int, 0);
4965 MODULE_AUTHOR("Alain L. Knaff");
4966 MODULE_SUPPORTED_DEVICE("fd");
4967 MODULE_LICENSE("GPL");
4969 /* This doesn't actually get used other than for module information */
4970 static const struct pnp_device_id floppy_pnpids[] = {
4975 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4979 __setup("floppy=", floppy_setup);
4980 module_init(floppy_init)
4983 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);