1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/drivers/block/floppy.c
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 * Copyright (C) 1993, 1994 Alain Knaff
7 * Copyright (C) 1998 Alan Cox
11 * 02.12.91 - Changed to static variables to indicate need for reset
12 * and recalibrate. This makes some things easier (output_byte reset
13 * checking etc), and means less interrupt jumping in case of errors,
14 * so the code is hopefully easier to understand.
18 * This file is certainly a mess. I've tried my best to get it working,
19 * but I don't like programming floppies, and I have only one anyway.
20 * Urgel. I should check for more errors, and do more graceful error
21 * recovery. Seems there are problems with several drives. I've tried to
22 * correct them. No promises.
26 * As with hd.c, all routines within this file can (and will) be called
27 * by interrupts, so extreme caution is needed. A hardware interrupt
28 * handler may not sleep, or a kernel panic will happen. Thus I cannot
29 * call "floppy-on" directly, but have to set a special timer interrupt
34 * 28.02.92 - made track-buffering routines, based on the routines written
35 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
39 * Automatic floppy-detection and formatting written by Werner Almesberger
40 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
41 * the floppy-change signal detection.
45 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
46 * FDC data overrun bug, added some preliminary stuff for vertical
49 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
51 * TODO: Errors are still not counted properly.
55 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
56 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
57 * Christoph H. Hochst\"atter.
58 * I have fixed the shift values to the ones I always use. Maybe a new
59 * ioctl() should be created to be able to modify them.
60 * There is a bug in the driver that makes it impossible to format a
61 * floppy as the first thing after bootup.
65 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
66 * this helped the floppy driver as well. Much cleaner, and still seems to
70 /* 1994/6/24 --bbroad-- added the floppy table entries and made
71 * minor modifications to allow 2.88 floppies to be run.
74 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
79 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
80 * format bug fixes, but unfortunately some new bugs too...
83 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
84 * errors to allow safe writing by specialized programs.
87 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
88 * by defining bit 1 of the "stretch" parameter to mean put sectors on the
89 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
90 * drives are "upside-down").
94 * 1995/8/26 -- Andreas Busse -- added Mips support.
98 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
99 * features to asm/floppy.h.
103 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
107 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
108 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
109 * use of '0' for NULL.
113 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
118 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
122 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
123 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
124 * being used to store jiffies, which are unsigned longs).
128 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
129 * - get rid of check_region
134 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
135 * floppy controller (lingering task on list after module is gone... boom.)
139 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
140 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
141 * requires many non-obvious changes in arch dependent code.
144 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
145 * Better audit of register_blkdev.
148 #undef FLOPPY_SILENT_DCL_CLEAR
150 #define REALLY_SLOW_IO
154 #define DPRINT(format, args...) \
155 pr_info("floppy%d: " format, current_drive, ##args)
157 #define DCL_DEBUG /* debug disk change line */
159 #define debug_dcl(test, fmt, args...) \
160 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
162 #define debug_dcl(test, fmt, args...) \
163 do { if (0) DPRINT(fmt, ##args); } while (0)
166 /* do print messages for unexpected interrupts */
167 static int print_unex = 1;
168 #include <linux/module.h>
169 #include <linux/sched.h>
170 #include <linux/fs.h>
171 #include <linux/kernel.h>
172 #include <linux/timer.h>
173 #include <linux/workqueue.h>
175 #include <linux/fdreg.h>
176 #include <linux/fd.h>
177 #include <linux/hdreg.h>
178 #include <linux/errno.h>
179 #include <linux/slab.h>
180 #include <linux/mm.h>
181 #include <linux/bio.h>
182 #include <linux/string.h>
183 #include <linux/jiffies.h>
184 #include <linux/fcntl.h>
185 #include <linux/delay.h>
186 #include <linux/mc146818rtc.h> /* CMOS defines */
187 #include <linux/ioport.h>
188 #include <linux/interrupt.h>
189 #include <linux/init.h>
190 #include <linux/platform_device.h>
191 #include <linux/mod_devicetable.h>
192 #include <linux/mutex.h>
193 #include <linux/io.h>
194 #include <linux/uaccess.h>
195 #include <linux/async.h>
196 #include <linux/compat.h>
199 * PS/2 floppies have much slower step rates than regular floppies.
200 * It's been recommended that take about 1/4 of the default speed
201 * in some more extreme cases.
203 static DEFINE_MUTEX(floppy_mutex);
204 static int slow_floppy;
209 static int FLOPPY_IRQ = 6;
210 static int FLOPPY_DMA = 2;
211 static int can_use_virtual_dma = 2;
213 * can use virtual DMA:
214 * 0 = use of virtual DMA disallowed by config
215 * 1 = use of virtual DMA prescribed by config
216 * 2 = no virtual DMA preference configured. By default try hard DMA,
217 * but fall back on virtual DMA when not enough memory available
220 static int use_virtual_dma;
224 * 1 using virtual DMA
225 * This variable is set to virtual when a DMA mem problem arises, and
226 * reset back in floppy_grab_irq_and_dma.
227 * It is not safe to reset it in other circumstances, because the floppy
228 * driver may have several buffers in use at once, and we do currently not
229 * record each buffers capabilities
232 static DEFINE_SPINLOCK(floppy_lock);
234 static unsigned short virtual_dma_port = 0x3f0;
235 irqreturn_t floppy_interrupt(int irq, void *dev_id);
236 static int set_dor(int fdc, char mask, char data);
238 #define K_64 0x10000 /* 64KB */
240 /* the following is the mask of allowed drives. By default units 2 and
241 * 3 of both floppy controllers are disabled, because switching on the
242 * motor of these drives causes system hangs on some PCI computers. drive
243 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
244 * a drive is allowed.
246 * NOTE: This must come before we include the arch floppy header because
247 * some ports reference this variable from there. -DaveM
250 static int allowed_drive_mask = 0x33;
252 #include <asm/floppy.h>
254 static int irqdma_allocated;
256 #include <linux/blk-mq.h>
257 #include <linux/blkpg.h>
258 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
259 #include <linux/completion.h>
261 static LIST_HEAD(floppy_reqs);
262 static struct request *current_req;
263 static int set_next_request(void);
265 #ifndef fd_get_dma_residue
266 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
269 /* Dma Memory related stuff */
271 #ifndef fd_dma_mem_free
272 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
275 #ifndef fd_dma_mem_alloc
276 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
279 #ifndef fd_cacheflush
280 #define fd_cacheflush(addr, size) /* nothing... */
283 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
285 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
287 return; /* we have the memory */
288 if (can_use_virtual_dma != 2)
289 return; /* no fallback allowed */
290 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
291 *addr = (char *)nodma_mem_alloc(l);
297 /* End dma memory related stuff */
299 static unsigned long fake_change;
300 static bool initialized;
302 #define ITYPE(x) (((x) >> 2) & 0x1f)
303 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
304 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
305 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
306 /* reverse mapping from unit and fdc to drive */
307 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
309 #define DP (&drive_params[current_drive])
310 #define DRS (&drive_state[current_drive])
311 #define DRWE (&write_errors[current_drive])
312 #define FDCS (&fdc_state[fdc])
314 #define UDP (&drive_params[drive])
315 #define UDRS (&drive_state[drive])
316 #define UDRWE (&write_errors[drive])
317 #define UFDCS (&fdc_state[FDC(drive)])
319 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
320 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
323 #define COMMAND (raw_cmd->cmd[0])
324 #define DR_SELECT (raw_cmd->cmd[1])
325 #define TRACK (raw_cmd->cmd[2])
326 #define HEAD (raw_cmd->cmd[3])
327 #define SECTOR (raw_cmd->cmd[4])
328 #define SIZECODE (raw_cmd->cmd[5])
329 #define SECT_PER_TRACK (raw_cmd->cmd[6])
330 #define GAP (raw_cmd->cmd[7])
331 #define SIZECODE2 (raw_cmd->cmd[8])
335 #define F_SIZECODE (raw_cmd->cmd[2])
336 #define F_SECT_PER_TRACK (raw_cmd->cmd[3])
337 #define F_GAP (raw_cmd->cmd[4])
338 #define F_FILL (raw_cmd->cmd[5])
342 * Maximum disk size (in kilobytes).
343 * This default is used whenever the current disk size is unknown.
344 * [Now it is rather a minimum]
346 #define MAX_DISK_SIZE 4 /* 3984 */
349 * globals used by 'result()'
351 #define MAX_REPLIES 16
352 static unsigned char reply_buffer[MAX_REPLIES];
353 static int inr; /* size of reply buffer, when called from interrupt */
354 #define ST0 (reply_buffer[0])
355 #define ST1 (reply_buffer[1])
356 #define ST2 (reply_buffer[2])
357 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
358 #define R_TRACK (reply_buffer[3])
359 #define R_HEAD (reply_buffer[4])
360 #define R_SECTOR (reply_buffer[5])
361 #define R_SIZECODE (reply_buffer[6])
363 #define SEL_DLY (2 * HZ / 100)
366 * this struct defines the different floppy drive types.
369 struct floppy_drive_params params;
370 const char *name; /* name printed while booting */
371 } default_drive_params[] = {
372 /* NOTE: the time values in jiffies should be in msec!
374 | Maximum data rate supported by drive type
375 | | Head load time, msec
376 | | | Head unload time, msec (not used)
377 | | | | Step rate interval, usec
378 | | | | | Time needed for spinup time (jiffies)
379 | | | | | | Timeout for spinning down (jiffies)
380 | | | | | | | Spindown offset (where disk stops)
381 | | | | | | | | Select delay
382 | | | | | | | | | RPS
383 | | | | | | | | | | Max number of tracks
384 | | | | | | | | | | | Interrupt timeout
385 | | | | | | | | | | | | Max nonintlv. sectors
386 | | | | | | | | | | | | | -Max Errors- flags */
387 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
388 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
390 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
391 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
393 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
394 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
396 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
397 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
399 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
400 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
402 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
403 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
405 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
406 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
407 /* | --autodetected formats--- | | |
408 * read_track | | Name printed when booting
410 * Frequency of disk change checks */
413 static struct floppy_drive_params drive_params[N_DRIVE];
414 static struct floppy_drive_struct drive_state[N_DRIVE];
415 static struct floppy_write_errors write_errors[N_DRIVE];
416 static struct timer_list motor_off_timer[N_DRIVE];
417 static struct gendisk *disks[N_DRIVE];
418 static struct blk_mq_tag_set tag_sets[N_DRIVE];
419 static struct block_device *opened_bdev[N_DRIVE];
420 static DEFINE_MUTEX(open_lock);
421 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
424 * This struct defines the different floppy types.
426 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
427 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
428 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
429 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
430 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
431 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
432 * side 0 is on physical side 0 (but with the misnamed sector IDs).
433 * 'stretch' should probably be renamed to something more general, like
436 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
437 * The LSB (bit 2) is flipped. For most disks, the first sector
438 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
439 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
440 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
442 * Other parameters should be self-explanatory (see also setfdprm(8)).
451 | | | | | | Data rate, | 0x40 for perp
452 | | | | | | | Spec1 (stepping rate, head unload
453 | | | | | | | | /fmt gap (gap2) */
454 static struct floppy_struct floppy_type[32] = {
455 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
456 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
457 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
458 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
459 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
460 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
461 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
462 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
463 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
464 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
466 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
467 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
468 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
469 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
470 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
471 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
472 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
473 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
474 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
475 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
477 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
478 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
479 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
480 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
481 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
482 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
483 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
484 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
485 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
486 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
488 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
489 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
492 #define SECTSIZE (_FD_SECTSIZE(*floppy))
494 /* Auto-detection: Disk type used until the next media change occurs. */
495 static struct floppy_struct *current_type[N_DRIVE];
498 * User-provided type information. current_type points to
499 * the respective entry of this array.
501 static struct floppy_struct user_params[N_DRIVE];
503 static sector_t floppy_sizes[256];
505 static char floppy_device_name[] = "floppy";
508 * The driver is trying to determine the correct media format
509 * while probing is set. rw_interrupt() clears it after a
514 /* Synchronization of FDC access. */
515 #define FD_COMMAND_NONE -1
516 #define FD_COMMAND_ERROR 2
517 #define FD_COMMAND_OKAY 3
519 static volatile int command_status = FD_COMMAND_NONE;
520 static unsigned long fdc_busy;
521 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
522 static DECLARE_WAIT_QUEUE_HEAD(command_done);
524 /* errors encountered on the current (or last) request */
525 static int floppy_errors;
527 /* Format request descriptor. */
528 static struct format_descr format_req;
531 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
532 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
533 * H is head unload time (1=16ms, 2=32ms, etc)
538 * Because these are written to by the DMA controller, they must
539 * not contain a 64k byte boundary crossing, or data will be
542 static char *floppy_track_buffer;
543 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 unsigned int new_fdc = fdc;
857 if (drive >= 0 && drive < N_DRIVE) {
858 new_fdc = FDC(drive);
859 current_drive = drive;
861 if (new_fdc >= N_FDC) {
862 pr_info("bad fdc value\n");
868 set_dor(1 - fdc, ~8, 0);
870 if (FDCS->rawcmd == 2)
872 if (fd_inb(FD_STATUS) != STATUS_READY)
876 /* locks the driver */
877 static int lock_fdc(int drive)
879 if (WARN(atomic_read(&usage_count) == 0,
880 "Trying to lock fdc while usage count=0\n"))
883 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
886 command_status = FD_COMMAND_NONE;
888 reschedule_timeout(drive, "lock fdc");
893 /* unlocks the driver */
894 static void unlock_fdc(void)
896 if (!test_bit(0, &fdc_busy))
897 DPRINT("FDC access conflict!\n");
900 command_status = FD_COMMAND_NONE;
901 cancel_delayed_work(&fd_timeout);
904 clear_bit(0, &fdc_busy);
908 /* switches the motor off after a given timeout */
909 static void motor_off_callback(struct timer_list *t)
911 unsigned long nr = t - motor_off_timer;
912 unsigned char mask = ~(0x10 << UNIT(nr));
914 if (WARN_ON_ONCE(nr >= N_DRIVE))
917 set_dor(FDC(nr), mask, 0);
920 /* schedules motor off */
921 static void floppy_off(unsigned int drive)
923 unsigned long volatile delta;
924 int fdc = FDC(drive);
926 if (!(FDCS->dor & (0x10 << UNIT(drive))))
929 del_timer(motor_off_timer + drive);
931 /* make spindle stop in a position which minimizes spinup time
934 delta = jiffies - UDRS->first_read_date + HZ -
935 UDP->spindown_offset;
936 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
937 motor_off_timer[drive].expires =
938 jiffies + UDP->spindown - delta;
940 add_timer(motor_off_timer + drive);
944 * cycle through all N_DRIVE floppy drives, for disk change testing.
945 * stopping at current drive. This is done before any long operation, to
946 * be sure to have up to date disk change information.
948 static void scandrives(void)
954 if (DP->select_delay)
957 saved_drive = current_drive;
958 for (i = 0; i < N_DRIVE; i++) {
959 drive = (saved_drive + i + 1) % N_DRIVE;
960 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
961 continue; /* skip closed drives */
963 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
964 (0x10 << UNIT(drive))))
965 /* switch the motor off again, if it was off to
967 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
969 set_fdc(saved_drive);
972 static void empty(void)
976 static void (*floppy_work_fn)(void);
978 static void floppy_work_workfn(struct work_struct *work)
983 static DECLARE_WORK(floppy_work, floppy_work_workfn);
985 static void schedule_bh(void (*handler)(void))
987 WARN_ON(work_pending(&floppy_work));
989 floppy_work_fn = handler;
990 queue_work(floppy_wq, &floppy_work);
993 static void (*fd_timer_fn)(void) = NULL;
995 static void fd_timer_workfn(struct work_struct *work)
1000 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
1002 static void cancel_activity(void)
1005 cancel_delayed_work(&fd_timer);
1006 cancel_work_sync(&floppy_work);
1009 /* this function makes sure that the disk stays in the drive during the
1011 static void fd_watchdog(void)
1013 debug_dcl(DP->flags, "calling disk change from watchdog\n");
1015 if (disk_change(current_drive)) {
1016 DPRINT("disk removed during i/o\n");
1021 cancel_delayed_work(&fd_timer);
1022 fd_timer_fn = fd_watchdog;
1023 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
1027 static void main_command_interrupt(void)
1029 cancel_delayed_work(&fd_timer);
1033 /* waits for a delay (spinup or select) to pass */
1034 static int fd_wait_for_completion(unsigned long expires,
1035 void (*function)(void))
1038 reset_fdc(); /* do the reset during sleep to win time
1039 * if we don't need to sleep, it's a good
1040 * occasion anyways */
1044 if (time_before(jiffies, expires)) {
1045 cancel_delayed_work(&fd_timer);
1046 fd_timer_fn = function;
1047 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
1053 static void setup_DMA(void)
1057 if (raw_cmd->length == 0) {
1060 pr_info("zero dma transfer size:");
1061 for (i = 0; i < raw_cmd->cmd_count; i++)
1062 pr_cont("%x,", raw_cmd->cmd[i]);
1068 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1069 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1074 f = claim_dma_lock();
1077 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1078 (raw_cmd->flags & FD_RAW_READ) ?
1079 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1080 release_dma_lock(f);
1085 release_dma_lock(f);
1088 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1089 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1090 DMA_MODE_READ : DMA_MODE_WRITE);
1091 fd_set_dma_addr(raw_cmd->kernel_data);
1092 fd_set_dma_count(raw_cmd->length);
1093 virtual_dma_port = FDCS->address;
1095 release_dma_lock(f);
1099 static void show_floppy(void);
1101 /* waits until the fdc becomes ready */
1102 static int wait_til_ready(void)
1109 for (counter = 0; counter < 10000; counter++) {
1110 status = fd_inb(FD_STATUS);
1111 if (status & STATUS_READY)
1115 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1122 /* sends a command byte to the fdc */
1123 static int output_byte(char byte)
1125 int status = wait_til_ready();
1130 if (is_ready_state(status)) {
1131 fd_outb(byte, FD_DATA);
1132 output_log[output_log_pos].data = byte;
1133 output_log[output_log_pos].status = status;
1134 output_log[output_log_pos].jiffies = jiffies;
1135 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1140 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1147 /* gets the response from the fdc */
1148 static int result(void)
1153 for (i = 0; i < MAX_REPLIES; i++) {
1154 status = wait_til_ready();
1157 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1158 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1159 resultjiffies = jiffies;
1163 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1164 reply_buffer[i] = fd_inb(FD_DATA);
1169 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1177 #define MORE_OUTPUT -2
1178 /* does the fdc need more output? */
1179 static int need_more_output(void)
1181 int status = wait_til_ready();
1186 if (is_ready_state(status))
1192 /* Set perpendicular mode as required, based on data rate, if supported.
1193 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1195 static void perpendicular_mode(void)
1197 unsigned char perp_mode;
1199 if (raw_cmd->rate & 0x40) {
1200 switch (raw_cmd->rate & 3) {
1208 DPRINT("Invalid data rate for perpendicular mode!\n");
1212 * convenient way to return to
1213 * redo without too much hassle
1214 * (deep stack et al.)
1221 if (FDCS->perp_mode == perp_mode)
1223 if (FDCS->version >= FDC_82077_ORIG) {
1224 output_byte(FD_PERPENDICULAR);
1225 output_byte(perp_mode);
1226 FDCS->perp_mode = perp_mode;
1227 } else if (perp_mode) {
1228 DPRINT("perpendicular mode not supported by this FDC.\n");
1230 } /* perpendicular_mode */
1232 static int fifo_depth = 0xa;
1235 static int fdc_configure(void)
1238 output_byte(FD_CONFIGURE);
1239 if (need_more_output() != MORE_OUTPUT)
1242 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1243 output_byte(0); /* pre-compensation from track
1248 #define NOMINAL_DTR 500
1250 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1251 * head load time, and DMA disable flag to values needed by floppy.
1253 * The value "dtr" is the data transfer rate in Kbps. It is needed
1254 * to account for the data rate-based scaling done by the 82072 and 82077
1255 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1258 * Note that changing the data transfer rate has a (probably deleterious)
1259 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1260 * fdc_specify is called again after each data transfer rate
1263 * srt: 1000 to 16000 in microseconds
1264 * hut: 16 to 240 milliseconds
1265 * hlt: 2 to 254 milliseconds
1267 * These values are rounded up to the next highest available delay time.
1269 static void fdc_specify(void)
1271 unsigned char spec1;
1272 unsigned char spec2;
1276 unsigned long dtr = NOMINAL_DTR;
1277 unsigned long scale_dtr = NOMINAL_DTR;
1278 int hlt_max_code = 0x7f;
1279 int hut_max_code = 0xf;
1281 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1283 FDCS->need_configure = 0;
1286 switch (raw_cmd->rate & 0x03) {
1292 if (FDCS->version >= FDC_82078) {
1293 /* chose the default rate table, not the one
1294 * where 1 = 2 Mbps */
1295 output_byte(FD_DRIVESPEC);
1296 if (need_more_output() == MORE_OUTPUT) {
1297 output_byte(UNIT(current_drive));
1307 if (FDCS->version >= FDC_82072) {
1309 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1310 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1313 /* Convert step rate from microseconds to milliseconds and 4 bits */
1314 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1321 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1324 else if (hlt > 0x7f)
1327 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1333 spec1 = (srt << 4) | hut;
1334 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1336 /* If these parameters did not change, just return with success */
1337 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1338 /* Go ahead and set spec1 and spec2 */
1339 output_byte(FD_SPECIFY);
1340 output_byte(FDCS->spec1 = spec1);
1341 output_byte(FDCS->spec2 = spec2);
1345 /* Set the FDC's data transfer rate on behalf of the specified drive.
1346 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1347 * of the specify command (i.e. using the fdc_specify function).
1349 static int fdc_dtr(void)
1351 /* If data rate not already set to desired value, set it. */
1352 if ((raw_cmd->rate & 3) == FDCS->dtr)
1356 fd_outb(raw_cmd->rate & 3, FD_DCR);
1358 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1359 * need a stabilization period of several milliseconds to be
1360 * enforced after data rate changes before R/W operations.
1361 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1363 FDCS->dtr = raw_cmd->rate & 3;
1364 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready);
1367 static void tell_sector(void)
1369 pr_cont(": track %d, head %d, sector %d, size %d",
1370 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1373 static void print_errors(void)
1376 if (ST0 & ST0_ECE) {
1377 pr_cont("Recalibrate failed!");
1378 } else if (ST2 & ST2_CRC) {
1379 pr_cont("data CRC error");
1381 } else if (ST1 & ST1_CRC) {
1382 pr_cont("CRC error");
1384 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1387 pr_cont("sector not found");
1390 pr_cont("probe failed...");
1391 } else if (ST2 & ST2_WC) { /* seek error */
1392 pr_cont("wrong cylinder");
1393 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1394 pr_cont("bad cylinder");
1396 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1404 * OK, this error interpreting routine is called after a
1405 * DMA read/write has succeeded
1406 * or failed, so we check the results, and copy any buffers.
1407 * hhb: Added better error reporting.
1408 * ak: Made this into a separate routine.
1410 static int interpret_errors(void)
1415 DPRINT("-- FDC reply error\n");
1420 /* check IC to find cause of interrupt */
1421 switch (ST0 & ST0_INTR) {
1422 case 0x40: /* error occurred during command execution */
1424 return 0; /* occurs with pseudo-DMA */
1427 DPRINT("Drive is write protected\n");
1428 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1431 } else if (ST1 & ST1_ND) {
1432 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1433 } else if (ST1 & ST1_OR) {
1434 if (DP->flags & FTD_MSG)
1435 DPRINT("Over/Underrun - retrying\n");
1437 } else if (floppy_errors >= DP->max_errors.reporting) {
1440 if (ST2 & ST2_WC || ST2 & ST2_BC)
1441 /* wrong cylinder => recal */
1442 DRS->track = NEED_2_RECAL;
1444 case 0x80: /* invalid command given */
1445 DPRINT("Invalid FDC command given!\n");
1449 DPRINT("Abnormal termination caused by polling\n");
1452 default: /* (0) Normal command termination */
1458 * This routine is called when everything should be correctly set up
1459 * for the transfer (i.e. floppy motor is on, the correct floppy is
1460 * selected, and the head is sitting on the right track).
1462 static void setup_rw_floppy(void)
1467 unsigned long ready_date;
1468 void (*function)(void);
1470 flags = raw_cmd->flags;
1471 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1472 flags |= FD_RAW_INTR;
1474 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1475 ready_date = DRS->spinup_date + DP->spinup;
1476 /* If spinup will take a long time, rerun scandrives
1477 * again just before spinup completion. Beware that
1478 * after scandrives, we must again wait for selection.
1480 if (time_after(ready_date, jiffies + DP->select_delay)) {
1481 ready_date -= DP->select_delay;
1482 function = floppy_start;
1484 function = setup_rw_floppy;
1486 /* wait until the floppy is spinning fast enough */
1487 if (fd_wait_for_completion(ready_date, function))
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=%ps\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 %ps\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=%ps\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=%ps\n", do_floppy);
1819 if (work_pending(&floppy_work))
1820 pr_info("floppy_work.func=%ps\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 = ++floppy_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 if (!F_SECT_PER_TRACK)
2128 /* allow for about 30ms for data transport per track */
2129 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2131 /* a ``cylinder'' is two tracks plus a little stepping time */
2132 track_shift = 2 * head_shift + 3;
2134 /* position of logical sector 1 on this track */
2135 n = (track_shift * format_req.track + head_shift * format_req.head)
2138 /* determine interleave */
2140 if (_floppy->fmt_gap < 0x22)
2143 /* initialize field */
2144 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2145 here[count].track = format_req.track;
2146 here[count].head = format_req.head;
2147 here[count].sect = 0;
2148 here[count].size = F_SIZECODE;
2150 /* place logical sectors */
2151 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2152 here[n].sect = count;
2153 n = (n + il) % F_SECT_PER_TRACK;
2154 if (here[n].sect) { /* sector busy, find next free sector */
2156 if (n >= F_SECT_PER_TRACK) {
2157 n -= F_SECT_PER_TRACK;
2158 while (here[n].sect)
2163 if (_floppy->stretch & FD_SECTBASEMASK) {
2164 for (count = 0; count < F_SECT_PER_TRACK; count++)
2165 here[count].sect += FD_SECTBASE(_floppy) - 1;
2169 static void redo_format(void)
2172 setup_format_params(format_req.track << STRETCH(_floppy));
2174 debugt(__func__, "queue format request");
2177 static const struct cont_t format_cont = {
2178 .interrupt = format_interrupt,
2179 .redo = redo_format,
2180 .error = bad_flp_intr,
2181 .done = generic_done
2184 static int do_format(int drive, struct format_descr *tmp_format_req)
2188 if (lock_fdc(drive))
2193 _floppy->track > DP->tracks ||
2194 tmp_format_req->track >= _floppy->track ||
2195 tmp_format_req->head >= _floppy->head ||
2196 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2197 !_floppy->fmt_gap) {
2198 process_fd_request();
2201 format_req = *tmp_format_req;
2202 cont = &format_cont;
2204 ret = wait_til_done(redo_format, true);
2207 process_fd_request();
2212 * Buffer read/write and support
2213 * =============================
2216 static void floppy_end_request(struct request *req, blk_status_t error)
2218 unsigned int nr_sectors = current_count_sectors;
2219 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2221 /* current_count_sectors can be zero if transfer failed */
2223 nr_sectors = blk_rq_cur_sectors(req);
2224 if (blk_update_request(req, error, nr_sectors << 9))
2226 __blk_mq_end_request(req, error);
2228 /* We're done with the request */
2233 /* new request_done. Can handle physical sectors which are smaller than a
2235 static void request_done(int uptodate)
2237 struct request *req = current_req;
2239 char msg[sizeof("request done ") + sizeof(int) * 3];
2242 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2243 reschedule_timeout(MAXTIMEOUT, msg);
2246 pr_info("floppy.c: no request in request_done\n");
2251 /* maintain values for invalidation on geometry
2253 block = current_count_sectors + blk_rq_pos(req);
2254 INFBOUND(DRS->maxblock, block);
2255 if (block > _floppy->sect)
2258 floppy_end_request(req, 0);
2260 if (rq_data_dir(req) == WRITE) {
2261 /* record write error information */
2262 DRWE->write_errors++;
2263 if (DRWE->write_errors == 1) {
2264 DRWE->first_error_sector = blk_rq_pos(req);
2265 DRWE->first_error_generation = DRS->generation;
2267 DRWE->last_error_sector = blk_rq_pos(req);
2268 DRWE->last_error_generation = DRS->generation;
2270 floppy_end_request(req, BLK_STS_IOERR);
2274 /* Interrupt handler evaluating the result of the r/w operation */
2275 static void rw_interrupt(void)
2283 /* some Toshiba floppy controllers occasionnally seem to
2284 * return bogus interrupts after read/write operations, which
2285 * can be recognized by a bad head number (>= 2) */
2289 if (!DRS->first_read_date)
2290 DRS->first_read_date = jiffies;
2293 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2305 nr_sectors = (((R_TRACK - TRACK) * heads +
2306 R_HEAD - HEAD) * SECT_PER_TRACK +
2307 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2309 if (nr_sectors / ssize >
2310 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2311 DPRINT("long rw: %x instead of %lx\n",
2312 nr_sectors, current_count_sectors);
2313 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2314 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2315 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2316 pr_info("heads=%d eoc=%d\n", heads, eoc);
2317 pr_info("spt=%d st=%d ss=%d\n",
2318 SECT_PER_TRACK, fsector_t, ssize);
2319 pr_info("in_sector_offset=%d\n", in_sector_offset);
2322 nr_sectors -= in_sector_offset;
2323 INFBOUND(nr_sectors, 0);
2324 SUPBOUND(current_count_sectors, nr_sectors);
2326 switch (interpret_errors()) {
2331 if (!current_count_sectors) {
2338 if (!current_count_sectors) {
2342 current_type[current_drive] = _floppy;
2343 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2348 if (DP->flags & FTD_MSG)
2349 DPRINT("Auto-detected floppy type %s in fd%d\n",
2350 _floppy->name, current_drive);
2351 current_type[current_drive] = _floppy;
2352 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2356 if (CT(COMMAND) != FD_READ ||
2357 raw_cmd->kernel_data == bio_data(current_req->bio)) {
2358 /* transfer directly from buffer */
2360 } else if (CT(COMMAND) == FD_READ) {
2361 buffer_track = raw_cmd->track;
2362 buffer_drive = current_drive;
2363 INFBOUND(buffer_max, nr_sectors + fsector_t);
2368 /* Compute maximal contiguous buffer size. */
2369 static int buffer_chain_size(void)
2373 struct req_iterator iter;
2376 base = bio_data(current_req->bio);
2379 rq_for_each_segment(bv, current_req, iter) {
2380 if (page_address(bv.bv_page) + bv.bv_offset != base + size)
2389 /* Compute the maximal transfer size */
2390 static int transfer_size(int ssize, int max_sector, int max_size)
2392 SUPBOUND(max_sector, fsector_t + max_size);
2395 max_sector -= (max_sector % _floppy->sect) % ssize;
2397 /* transfer size, beginning not aligned */
2398 current_count_sectors = max_sector - fsector_t;
2404 * Move data from/to the track buffer to/from the buffer cache.
2406 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2408 int remaining; /* number of transferred 512-byte sectors */
2413 struct req_iterator iter;
2415 max_sector = transfer_size(ssize,
2416 min(max_sector, max_sector_2),
2417 blk_rq_sectors(current_req));
2419 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2420 buffer_max > fsector_t + blk_rq_sectors(current_req))
2421 current_count_sectors = min_t(int, buffer_max - fsector_t,
2422 blk_rq_sectors(current_req));
2424 remaining = current_count_sectors << 9;
2425 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2426 DPRINT("in copy buffer\n");
2427 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2428 pr_info("remaining=%d\n", remaining >> 9);
2429 pr_info("current_req->nr_sectors=%u\n",
2430 blk_rq_sectors(current_req));
2431 pr_info("current_req->current_nr_sectors=%u\n",
2432 blk_rq_cur_sectors(current_req));
2433 pr_info("max_sector=%d\n", max_sector);
2434 pr_info("ssize=%d\n", ssize);
2437 buffer_max = max(max_sector, buffer_max);
2439 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2441 size = blk_rq_cur_bytes(current_req);
2443 rq_for_each_segment(bv, current_req, iter) {
2448 SUPBOUND(size, remaining);
2450 buffer = page_address(bv.bv_page) + bv.bv_offset;
2451 if (dma_buffer + size >
2452 floppy_track_buffer + (max_buffer_sectors << 10) ||
2453 dma_buffer < floppy_track_buffer) {
2454 DPRINT("buffer overrun in copy buffer %d\n",
2455 (int)((floppy_track_buffer - dma_buffer) >> 9));
2456 pr_info("fsector_t=%d buffer_min=%d\n",
2457 fsector_t, buffer_min);
2458 pr_info("current_count_sectors=%ld\n",
2459 current_count_sectors);
2460 if (CT(COMMAND) == FD_READ)
2462 if (CT(COMMAND) == FD_WRITE)
2466 if (((unsigned long)buffer) % 512)
2467 DPRINT("%p buffer not aligned\n", buffer);
2469 if (CT(COMMAND) == FD_READ)
2470 memcpy(buffer, dma_buffer, size);
2472 memcpy(dma_buffer, buffer, size);
2479 max_sector -= remaining >> 9;
2480 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2484 /* work around a bug in pseudo DMA
2485 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2486 * sending data. Hence we need a different way to signal the
2487 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2488 * does not work with MT, hence we can only transfer one head at
2491 static void virtualdmabug_workaround(void)
2496 if (CT(COMMAND) == FD_WRITE) {
2497 COMMAND &= ~0x80; /* switch off multiple track mode */
2499 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2500 end_sector = SECTOR + hard_sectors - 1;
2501 if (end_sector > SECT_PER_TRACK) {
2502 pr_info("too many sectors %d > %d\n",
2503 end_sector, SECT_PER_TRACK);
2506 SECT_PER_TRACK = end_sector;
2507 /* make sure SECT_PER_TRACK
2508 * points to end of transfer */
2513 * Formulate a read/write request.
2514 * this routine decides where to load the data (directly to buffer, or to
2515 * tmp floppy area), how much data to load (the size of the buffer, the whole
2516 * track, or a single sector)
2517 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2518 * allocation on the fly, it should be done here. No other part should need
2522 static int make_raw_rw_request(void)
2524 int aligned_sector_t;
2530 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2533 set_fdc((long)current_req->rq_disk->private_data);
2535 raw_cmd = &default_raw_cmd;
2536 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2537 raw_cmd->cmd_count = NR_RW;
2538 if (rq_data_dir(current_req) == READ) {
2539 raw_cmd->flags |= FD_RAW_READ;
2540 COMMAND = FM_MODE(_floppy, FD_READ);
2541 } else if (rq_data_dir(current_req) == WRITE) {
2542 raw_cmd->flags |= FD_RAW_WRITE;
2543 COMMAND = FM_MODE(_floppy, FD_WRITE);
2545 DPRINT("%s: unknown command\n", __func__);
2549 max_sector = _floppy->sect * _floppy->head;
2551 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2552 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2553 if (_floppy->track && TRACK >= _floppy->track) {
2554 if (blk_rq_cur_sectors(current_req) & 1) {
2555 current_count_sectors = 1;
2560 HEAD = fsector_t / _floppy->sect;
2562 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2563 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2564 fsector_t < _floppy->sect)
2565 max_sector = _floppy->sect;
2567 /* 2M disks have phantom sectors on the first track */
2568 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2569 max_sector = 2 * _floppy->sect / 3;
2570 if (fsector_t >= max_sector) {
2571 current_count_sectors =
2572 min_t(int, _floppy->sect - fsector_t,
2573 blk_rq_sectors(current_req));
2578 SIZECODE = FD_SIZECODE(_floppy);
2579 raw_cmd->rate = _floppy->rate & 0x43;
2580 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2587 raw_cmd->track = TRACK << STRETCH(_floppy);
2588 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2590 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2591 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2592 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2593 FD_SECTBASE(_floppy);
2595 /* tracksize describes the size which can be filled up with sectors
2598 tracksize = _floppy->sect - _floppy->sect % ssize;
2599 if (tracksize < _floppy->sect) {
2601 if (tracksize <= fsector_t % _floppy->sect)
2604 /* if we are beyond tracksize, fill up using smaller sectors */
2605 while (tracksize <= fsector_t % _floppy->sect) {
2606 while (tracksize + ssize > _floppy->sect) {
2614 max_sector = HEAD * _floppy->sect + tracksize;
2615 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2616 max_sector = _floppy->sect;
2617 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2618 /* for virtual DMA bug workaround */
2619 max_sector = _floppy->sect;
2622 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2623 aligned_sector_t = fsector_t - in_sector_offset;
2624 max_size = blk_rq_sectors(current_req);
2625 if ((raw_cmd->track == buffer_track) &&
2626 (current_drive == buffer_drive) &&
2627 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2628 /* data already in track buffer */
2629 if (CT(COMMAND) == FD_READ) {
2630 copy_buffer(1, max_sector, buffer_max);
2633 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2634 if (CT(COMMAND) == FD_WRITE) {
2635 unsigned int sectors;
2637 sectors = fsector_t + blk_rq_sectors(current_req);
2638 if (sectors > ssize && sectors < ssize + ssize)
2639 max_size = ssize + ssize;
2643 raw_cmd->flags &= ~FD_RAW_WRITE;
2644 raw_cmd->flags |= FD_RAW_READ;
2645 COMMAND = FM_MODE(_floppy, FD_READ);
2646 } else if ((unsigned long)bio_data(current_req->bio) < MAX_DMA_ADDRESS) {
2647 unsigned long dma_limit;
2648 int direct, indirect;
2651 transfer_size(ssize, max_sector,
2652 max_buffer_sectors * 2) - fsector_t;
2655 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2656 * on a 64 bit machine!
2658 max_size = buffer_chain_size();
2659 dma_limit = (MAX_DMA_ADDRESS -
2660 ((unsigned long)bio_data(current_req->bio))) >> 9;
2661 if ((unsigned long)max_size > dma_limit)
2662 max_size = dma_limit;
2663 /* 64 kb boundaries */
2664 if (CROSS_64KB(bio_data(current_req->bio), max_size << 9))
2666 ((unsigned long)bio_data(current_req->bio)) %
2668 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2670 * We try to read tracks, but if we get too many errors, we
2671 * go back to reading just one sector at a time.
2673 * This means we should be able to read a sector even if there
2674 * are other bad sectors on this track.
2677 (indirect * 2 > direct * 3 &&
2678 floppy_errors < DP->max_errors.read_track &&
2680 (DP->read_track & (1 << DRS->probed_format)))))) {
2681 max_size = blk_rq_sectors(current_req);
2683 raw_cmd->kernel_data = bio_data(current_req->bio);
2684 raw_cmd->length = current_count_sectors << 9;
2685 if (raw_cmd->length == 0) {
2686 DPRINT("%s: zero dma transfer attempted\n", __func__);
2687 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2688 indirect, direct, fsector_t);
2691 virtualdmabug_workaround();
2696 if (CT(COMMAND) == FD_READ)
2697 max_size = max_sector; /* unbounded */
2699 /* claim buffer track if needed */
2700 if (buffer_track != raw_cmd->track || /* bad track */
2701 buffer_drive != current_drive || /* bad drive */
2702 fsector_t > buffer_max ||
2703 fsector_t < buffer_min ||
2704 ((CT(COMMAND) == FD_READ ||
2705 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2706 max_sector > 2 * max_buffer_sectors + buffer_min &&
2707 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2708 /* not enough space */
2710 buffer_drive = current_drive;
2711 buffer_max = buffer_min = aligned_sector_t;
2713 raw_cmd->kernel_data = floppy_track_buffer +
2714 ((aligned_sector_t - buffer_min) << 9);
2716 if (CT(COMMAND) == FD_WRITE) {
2717 /* copy write buffer to track buffer.
2718 * if we get here, we know that the write
2719 * is either aligned or the data already in the buffer
2720 * (buffer will be overwritten) */
2721 if (in_sector_offset && buffer_track == -1)
2722 DPRINT("internal error offset !=0 on write\n");
2723 buffer_track = raw_cmd->track;
2724 buffer_drive = current_drive;
2725 copy_buffer(ssize, max_sector,
2726 2 * max_buffer_sectors + buffer_min);
2728 transfer_size(ssize, max_sector,
2729 2 * max_buffer_sectors + buffer_min -
2732 /* round up current_count_sectors to get dma xfer size */
2733 raw_cmd->length = in_sector_offset + current_count_sectors;
2734 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2735 raw_cmd->length <<= 9;
2736 if ((raw_cmd->length < current_count_sectors << 9) ||
2737 (raw_cmd->kernel_data != bio_data(current_req->bio) &&
2738 CT(COMMAND) == FD_WRITE &&
2739 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2740 aligned_sector_t < buffer_min)) ||
2741 raw_cmd->length % (128 << SIZECODE) ||
2742 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2743 DPRINT("fractionary current count b=%lx s=%lx\n",
2744 raw_cmd->length, current_count_sectors);
2745 if (raw_cmd->kernel_data != bio_data(current_req->bio))
2746 pr_info("addr=%d, length=%ld\n",
2747 (int)((raw_cmd->kernel_data -
2748 floppy_track_buffer) >> 9),
2749 current_count_sectors);
2750 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2751 fsector_t, aligned_sector_t, max_sector, max_size);
2752 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2753 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2754 COMMAND, SECTOR, HEAD, TRACK);
2755 pr_info("buffer drive=%d\n", buffer_drive);
2756 pr_info("buffer track=%d\n", buffer_track);
2757 pr_info("buffer_min=%d\n", buffer_min);
2758 pr_info("buffer_max=%d\n", buffer_max);
2762 if (raw_cmd->kernel_data != bio_data(current_req->bio)) {
2763 if (raw_cmd->kernel_data < floppy_track_buffer ||
2764 current_count_sectors < 0 ||
2765 raw_cmd->length < 0 ||
2766 raw_cmd->kernel_data + raw_cmd->length >
2767 floppy_track_buffer + (max_buffer_sectors << 10)) {
2768 DPRINT("buffer overrun in schedule dma\n");
2769 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2770 fsector_t, buffer_min, raw_cmd->length >> 9);
2771 pr_info("current_count_sectors=%ld\n",
2772 current_count_sectors);
2773 if (CT(COMMAND) == FD_READ)
2775 if (CT(COMMAND) == FD_WRITE)
2779 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2780 current_count_sectors > blk_rq_sectors(current_req)) {
2781 DPRINT("buffer overrun in direct transfer\n");
2783 } else if (raw_cmd->length < current_count_sectors << 9) {
2784 DPRINT("more sectors than bytes\n");
2785 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2786 pr_info("sectors=%ld\n", current_count_sectors);
2788 if (raw_cmd->length == 0) {
2789 DPRINT("zero dma transfer attempted from make_raw_request\n");
2793 virtualdmabug_workaround();
2797 static int set_next_request(void)
2799 current_req = list_first_entry_or_null(&floppy_reqs, struct request,
2803 list_del_init(¤t_req->queuelist);
2809 static void redo_fd_request(void)
2815 if (current_drive < N_DRIVE)
2816 floppy_off(current_drive);
2822 spin_lock_irq(&floppy_lock);
2823 pending = set_next_request();
2824 spin_unlock_irq(&floppy_lock);
2831 drive = (long)current_req->rq_disk->private_data;
2833 reschedule_timeout(current_reqD, "redo fd request");
2836 raw_cmd = &default_raw_cmd;
2838 if (start_motor(redo_fd_request))
2841 disk_change(current_drive);
2842 if (test_bit(current_drive, &fake_change) ||
2843 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2844 DPRINT("disk absent or changed during operation\n");
2848 if (!_floppy) { /* Autodetection */
2850 DRS->probed_format = 0;
2851 if (next_valid_format()) {
2852 DPRINT("no autodetectable formats\n");
2859 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2862 tmp = make_raw_rw_request();
2868 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2870 schedule_bh(floppy_start);
2871 debugt(__func__, "queue fd request");
2875 static const struct cont_t rw_cont = {
2876 .interrupt = rw_interrupt,
2877 .redo = redo_fd_request,
2878 .error = bad_flp_intr,
2879 .done = request_done
2882 static void process_fd_request(void)
2885 schedule_bh(redo_fd_request);
2888 static blk_status_t floppy_queue_rq(struct blk_mq_hw_ctx *hctx,
2889 const struct blk_mq_queue_data *bd)
2891 blk_mq_start_request(bd->rq);
2893 if (WARN(max_buffer_sectors == 0,
2894 "VFS: %s called on non-open device\n", __func__))
2895 return BLK_STS_IOERR;
2897 if (WARN(atomic_read(&usage_count) == 0,
2898 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n",
2899 current_req, (long)blk_rq_pos(current_req),
2900 (unsigned long long) current_req->cmd_flags))
2901 return BLK_STS_IOERR;
2903 if (test_and_set_bit(0, &fdc_busy)) {
2904 /* fdc busy, this new request will be treated when the
2905 current one is done */
2906 is_alive(__func__, "old request running");
2907 return BLK_STS_RESOURCE;
2910 spin_lock_irq(&floppy_lock);
2911 list_add_tail(&bd->rq->queuelist, &floppy_reqs);
2912 spin_unlock_irq(&floppy_lock);
2914 command_status = FD_COMMAND_NONE;
2915 __reschedule_timeout(MAXTIMEOUT, "fd_request");
2917 process_fd_request();
2918 is_alive(__func__, "");
2922 static const struct cont_t poll_cont = {
2923 .interrupt = success_and_wakeup,
2924 .redo = floppy_ready,
2925 .error = generic_failure,
2926 .done = generic_done
2929 static int poll_drive(bool interruptible, int flag)
2931 /* no auto-sense, just clear dcl */
2932 raw_cmd = &default_raw_cmd;
2933 raw_cmd->flags = flag;
2935 raw_cmd->cmd_count = 0;
2937 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2938 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2940 return wait_til_done(floppy_ready, interruptible);
2944 * User triggered reset
2945 * ====================
2948 static void reset_intr(void)
2950 pr_info("weird, reset interrupt called\n");
2953 static const struct cont_t reset_cont = {
2954 .interrupt = reset_intr,
2955 .redo = success_and_wakeup,
2956 .error = generic_failure,
2957 .done = generic_done
2960 static int user_reset_fdc(int drive, int arg, bool interruptible)
2964 if (lock_fdc(drive))
2967 if (arg == FD_RESET_ALWAYS)
2971 ret = wait_til_done(reset_fdc, interruptible);
2975 process_fd_request();
2980 * Misc Ioctl's and support
2981 * ========================
2983 static inline int fd_copyout(void __user *param, const void *address,
2986 return copy_to_user(param, address, size) ? -EFAULT : 0;
2989 static inline int fd_copyin(void __user *param, void *address,
2992 return copy_from_user(address, param, size) ? -EFAULT : 0;
2995 static const char *drive_name(int type, int drive)
2997 struct floppy_struct *floppy;
3000 floppy = floppy_type + type;
3002 if (UDP->native_format)
3003 floppy = floppy_type + UDP->native_format;
3008 return floppy->name;
3013 #ifdef CONFIG_BLK_DEV_FD_RAWCMD
3016 static void raw_cmd_done(int flag)
3021 raw_cmd->flags |= FD_RAW_FAILURE;
3022 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3024 raw_cmd->reply_count = inr;
3025 if (raw_cmd->reply_count > MAX_REPLIES)
3026 raw_cmd->reply_count = 0;
3027 for (i = 0; i < raw_cmd->reply_count; i++)
3028 raw_cmd->reply[i] = reply_buffer[i];
3030 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3031 unsigned long flags;
3032 flags = claim_dma_lock();
3033 raw_cmd->length = fd_get_dma_residue();
3034 release_dma_lock(flags);
3037 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3038 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3039 raw_cmd->flags |= FD_RAW_FAILURE;
3041 if (disk_change(current_drive))
3042 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3044 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3045 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3046 motor_off_callback(&motor_off_timer[current_drive]);
3048 if (raw_cmd->next &&
3049 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3050 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3051 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3052 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3053 raw_cmd = raw_cmd->next;
3060 static const struct cont_t raw_cmd_cont = {
3061 .interrupt = success_and_wakeup,
3062 .redo = floppy_start,
3063 .error = generic_failure,
3064 .done = raw_cmd_done
3067 static int raw_cmd_copyout(int cmd, void __user *param,
3068 struct floppy_raw_cmd *ptr)
3073 struct floppy_raw_cmd cmd = *ptr;
3075 cmd.kernel_data = NULL;
3076 ret = copy_to_user(param, &cmd, sizeof(cmd));
3079 param += sizeof(struct floppy_raw_cmd);
3080 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3081 if (ptr->length >= 0 &&
3082 ptr->length <= ptr->buffer_length) {
3083 long length = ptr->buffer_length - ptr->length;
3084 ret = fd_copyout(ptr->data, ptr->kernel_data,
3096 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3098 struct floppy_raw_cmd *next;
3099 struct floppy_raw_cmd *this;
3104 if (this->buffer_length) {
3105 fd_dma_mem_free((unsigned long)this->kernel_data,
3106 this->buffer_length);
3107 this->buffer_length = 0;
3115 #define MAX_LEN (1UL << MAX_ORDER << PAGE_SHIFT)
3117 static int raw_cmd_copyin(int cmd, void __user *param,
3118 struct floppy_raw_cmd **rcmd)
3120 struct floppy_raw_cmd *ptr;
3127 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL);
3131 ret = copy_from_user(ptr, param, sizeof(*ptr));
3133 ptr->buffer_length = 0;
3134 ptr->kernel_data = NULL;
3137 param += sizeof(struct floppy_raw_cmd);
3138 if (ptr->cmd_count > 33)
3139 /* the command may now also take up the space
3140 * initially intended for the reply & the
3141 * reply count. Needed for long 82078 commands
3142 * such as RESTORE, which takes ... 17 command
3143 * bytes. Murphy's law #137: When you reserve
3144 * 16 bytes for a structure, you'll one day
3145 * discover that you really need 17...
3149 for (i = 0; i < 16; i++)
3151 ptr->resultcode = 0;
3153 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3154 if (ptr->length <= 0 || ptr->length >= MAX_LEN)
3156 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3157 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3158 if (!ptr->kernel_data)
3160 ptr->buffer_length = ptr->length;
3162 if (ptr->flags & FD_RAW_WRITE) {
3163 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3168 if (ptr->flags & FD_RAW_MORE) {
3169 rcmd = &(ptr->next);
3177 static int raw_cmd_ioctl(int cmd, void __user *param)
3179 struct floppy_raw_cmd *my_raw_cmd;
3184 if (FDCS->rawcmd <= 1)
3186 for (drive = 0; drive < N_DRIVE; drive++) {
3187 if (FDC(drive) != fdc)
3189 if (drive == current_drive) {
3190 if (UDRS->fd_ref > 1) {
3194 } else if (UDRS->fd_ref) {
3203 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3205 raw_cmd_free(&my_raw_cmd);
3209 raw_cmd = my_raw_cmd;
3210 cont = &raw_cmd_cont;
3211 ret = wait_til_done(floppy_start, true);
3212 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3214 if (ret != -EINTR && FDCS->reset)
3217 DRS->track = NO_TRACK;
3219 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3222 raw_cmd_free(&my_raw_cmd);
3226 static int floppy_raw_cmd_ioctl(int type, int drive, int cmd,
3231 pr_warn_once("Note: FDRAWCMD is deprecated and will be removed from the kernel in the near future.\n");
3235 if (lock_fdc(drive))
3238 ret = raw_cmd_ioctl(cmd, param);
3241 process_fd_request();
3245 #else /* CONFIG_BLK_DEV_FD_RAWCMD */
3247 static int floppy_raw_cmd_ioctl(int type, int drive, int cmd,
3255 static int invalidate_drive(struct block_device *bdev)
3257 /* invalidate the buffer track to force a reread */
3258 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3259 process_fd_request();
3260 check_disk_change(bdev);
3264 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3265 int drive, int type, struct block_device *bdev)
3269 /* sanity checking for parameters. */
3270 if ((int)g->sect <= 0 ||
3271 (int)g->head <= 0 ||
3272 /* check for overflow in max_sector */
3273 (int)(g->sect * g->head) <= 0 ||
3274 /* check for zero in F_SECT_PER_TRACK */
3275 (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 ||
3276 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3277 /* check if reserved bits are set */
3278 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3281 if (!capable(CAP_SYS_ADMIN))
3283 mutex_lock(&open_lock);
3284 if (lock_fdc(drive)) {
3285 mutex_unlock(&open_lock);
3288 floppy_type[type] = *g;
3289 floppy_type[type].name = "user format";
3290 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3291 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3292 floppy_type[type].size + 1;
3293 process_fd_request();
3294 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3295 struct block_device *bdev = opened_bdev[cnt];
3296 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3298 __invalidate_device(bdev, true);
3300 mutex_unlock(&open_lock);
3304 if (lock_fdc(drive))
3306 if (cmd != FDDEFPRM) {
3307 /* notice a disk change immediately, else
3308 * we lose our settings immediately*/
3309 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3312 oldStretch = g->stretch;
3313 user_params[drive] = *g;
3314 if (buffer_drive == drive)
3315 SUPBOUND(buffer_max, user_params[drive].sect);
3316 current_type[drive] = &user_params[drive];
3317 floppy_sizes[drive] = user_params[drive].size;
3318 if (cmd == FDDEFPRM)
3319 DRS->keep_data = -1;
3322 /* invalidation. Invalidate only when needed, i.e.
3323 * when there are already sectors in the buffer cache
3324 * whose number will change. This is useful, because
3325 * mtools often changes the geometry of the disk after
3326 * looking at the boot block */
3327 if (DRS->maxblock > user_params[drive].sect ||
3329 ((user_params[drive].sect ^ oldStretch) &
3330 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3331 invalidate_drive(bdev);
3333 process_fd_request();
3338 /* handle obsolete ioctl's */
3339 static unsigned int ioctl_table[] = {
3367 static int normalize_ioctl(unsigned int *cmd, int *size)
3371 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3372 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3373 *size = _IOC_SIZE(*cmd);
3374 *cmd = ioctl_table[i];
3375 if (*size > _IOC_SIZE(*cmd)) {
3376 pr_info("ioctl not yet supported\n");
3385 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3388 *g = &floppy_type[type];
3390 if (lock_fdc(drive))
3392 if (poll_drive(false, 0) == -EINTR)
3394 process_fd_request();
3395 *g = current_type[drive];
3402 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3404 int drive = (long)bdev->bd_disk->private_data;
3405 int type = ITYPE(drive_state[drive].fd_device);
3406 struct floppy_struct *g;
3409 ret = get_floppy_geometry(drive, type, &g);
3413 geo->heads = g->head;
3414 geo->sectors = g->sect;
3415 geo->cylinders = g->track;
3419 static bool valid_floppy_drive_params(const short autodetect[8],
3422 size_t floppy_type_size = ARRAY_SIZE(floppy_type);
3425 for (i = 0; i < 8; ++i) {
3426 if (autodetect[i] < 0 ||
3427 autodetect[i] >= floppy_type_size)
3431 if (native_format < 0 || native_format >= floppy_type_size)
3437 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3438 unsigned long param)
3440 int drive = (long)bdev->bd_disk->private_data;
3441 int type = ITYPE(UDRS->fd_device);
3445 struct floppy_struct g; /* geometry */
3446 struct format_descr f;
3447 struct floppy_max_errors max_errors;
3448 struct floppy_drive_params dp;
3449 } inparam; /* parameters coming from user space */
3450 const void *outparam; /* parameters passed back to user space */
3452 /* convert compatibility eject ioctls into floppy eject ioctl.
3453 * We do this in order to provide a means to eject floppy disks before
3454 * installing the new fdutils package */
3455 if (cmd == CDROMEJECT || /* CD-ROM eject */
3456 cmd == 0x6470) { /* SunOS floppy eject */
3457 DPRINT("obsolete eject ioctl\n");
3458 DPRINT("please use floppycontrol --eject\n");
3462 if (!((cmd & 0xff00) == 0x0200))
3465 /* convert the old style command into a new style command */
3466 ret = normalize_ioctl(&cmd, &size);
3470 /* permission checks */
3471 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3472 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3475 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3479 memset(&inparam, 0, sizeof(inparam));
3480 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3481 ret = fd_copyin((void __user *)param, &inparam, size);
3488 if (UDRS->fd_ref != 1)
3489 /* somebody else has this drive open */
3491 if (lock_fdc(drive))
3494 /* do the actual eject. Fails on
3495 * non-Sparc architectures */
3496 ret = fd_eject(UNIT(drive));
3498 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3499 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3500 process_fd_request();
3503 if (lock_fdc(drive))
3505 current_type[drive] = NULL;
3506 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3507 UDRS->keep_data = 0;
3508 return invalidate_drive(bdev);
3511 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3513 ret = get_floppy_geometry(drive, type,
3514 (struct floppy_struct **)&outparam);
3517 memcpy(&inparam.g, outparam,
3518 offsetof(struct floppy_struct, name));
3519 outparam = &inparam.g;
3522 UDP->flags |= FTD_MSG;
3525 UDP->flags &= ~FTD_MSG;
3528 if (lock_fdc(drive))
3530 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3533 process_fd_request();
3534 if (ret & FD_VERIFY)
3536 if (!(ret & FD_DISK_WRITABLE))
3540 if (UDRS->fd_ref != 1)
3542 return do_format(drive, &inparam.f);
3545 if (lock_fdc(drive))
3547 return invalidate_drive(bdev);
3548 case FDSETEMSGTRESH:
3549 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3552 outparam = &UDP->max_errors;
3555 UDP->max_errors = inparam.max_errors;
3558 outparam = drive_name(type, drive);
3559 SUPBOUND(size, strlen((const char *)outparam) + 1);
3562 if (!valid_floppy_drive_params(inparam.dp.autodetect,
3563 inparam.dp.native_format))
3571 if (lock_fdc(drive))
3573 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3575 process_fd_request();
3581 return user_reset_fdc(drive, (int)param, true);
3586 memset(UDRWE, 0, sizeof(*UDRWE));
3592 return floppy_raw_cmd_ioctl(type, drive, cmd, (void __user *)param);
3594 if (lock_fdc(drive))
3597 process_fd_request();
3603 if (_IOC_DIR(cmd) & _IOC_READ)
3604 return fd_copyout((void __user *)param, outparam, size);
3609 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3610 unsigned int cmd, unsigned long param)
3614 mutex_lock(&floppy_mutex);
3615 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3616 mutex_unlock(&floppy_mutex);
3621 #ifdef CONFIG_COMPAT
3623 struct compat_floppy_drive_params {
3625 compat_ulong_t max_dtr;
3629 compat_ulong_t spinup;
3630 compat_ulong_t spindown;
3631 unsigned char spindown_offset;
3632 unsigned char select_delay;
3634 unsigned char tracks;
3635 compat_ulong_t timeout;
3636 unsigned char interleave_sect;
3637 struct floppy_max_errors max_errors;
3640 short autodetect[8];
3641 compat_int_t checkfreq;
3642 compat_int_t native_format;
3645 struct compat_floppy_drive_struct {
3647 compat_ulong_t spinup_date;
3648 compat_ulong_t select_date;
3649 compat_ulong_t first_read_date;
3650 short probed_format;
3654 compat_int_t generation;
3655 compat_int_t keep_data;
3656 compat_int_t fd_ref;
3657 compat_int_t fd_device;
3658 compat_int_t last_checked;
3659 compat_caddr_t dmabuf;
3660 compat_int_t bufblocks;
3663 struct compat_floppy_fdc_state {
3667 unsigned char version;
3669 compat_ulong_t address;
3670 unsigned int rawcmd:2;
3671 unsigned int reset:1;
3672 unsigned int need_configure:1;
3673 unsigned int perp_mode:2;
3674 unsigned int has_fifo:1;
3675 unsigned int driver_version;
3676 unsigned char track[4];
3679 struct compat_floppy_write_errors {
3680 unsigned int write_errors;
3681 compat_ulong_t first_error_sector;
3682 compat_int_t first_error_generation;
3683 compat_ulong_t last_error_sector;
3684 compat_int_t last_error_generation;
3685 compat_uint_t badness;
3688 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
3689 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
3690 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
3691 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
3692 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
3693 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
3694 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
3695 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
3697 static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3698 struct compat_floppy_struct __user *arg)
3700 struct floppy_struct v;
3704 BUILD_BUG_ON(offsetof(struct floppy_struct, name) !=
3705 offsetof(struct compat_floppy_struct, name));
3707 if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL)))
3710 memset(&v, 0, sizeof(struct floppy_struct));
3711 if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name)))
3714 mutex_lock(&floppy_mutex);
3715 drive = (long)bdev->bd_disk->private_data;
3716 type = ITYPE(UDRS->fd_device);
3717 err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM,
3718 &v, drive, type, bdev);
3719 mutex_unlock(&floppy_mutex);
3723 static int compat_get_prm(int drive,
3724 struct compat_floppy_struct __user *arg)
3726 struct compat_floppy_struct v;
3727 struct floppy_struct *p;
3730 memset(&v, 0, sizeof(v));
3731 mutex_lock(&floppy_mutex);
3732 err = get_floppy_geometry(drive, ITYPE(UDRS->fd_device), &p);
3734 mutex_unlock(&floppy_mutex);
3737 memcpy(&v, p, offsetof(struct floppy_struct, name));
3738 mutex_unlock(&floppy_mutex);
3739 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct)))
3744 static int compat_setdrvprm(int drive,
3745 struct compat_floppy_drive_params __user *arg)
3747 struct compat_floppy_drive_params v;
3749 if (!capable(CAP_SYS_ADMIN))
3751 if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params)))
3753 if (!valid_floppy_drive_params(v.autodetect, v.native_format))
3755 mutex_lock(&floppy_mutex);
3757 UDP->max_dtr = v.max_dtr;
3761 UDP->spinup = v.spinup;
3762 UDP->spindown = v.spindown;
3763 UDP->spindown_offset = v.spindown_offset;
3764 UDP->select_delay = v.select_delay;
3766 UDP->tracks = v.tracks;
3767 UDP->timeout = v.timeout;
3768 UDP->interleave_sect = v.interleave_sect;
3769 UDP->max_errors = v.max_errors;
3770 UDP->flags = v.flags;
3771 UDP->read_track = v.read_track;
3772 memcpy(UDP->autodetect, v.autodetect, sizeof(v.autodetect));
3773 UDP->checkfreq = v.checkfreq;
3774 UDP->native_format = v.native_format;
3775 mutex_unlock(&floppy_mutex);
3779 static int compat_getdrvprm(int drive,
3780 struct compat_floppy_drive_params __user *arg)
3782 struct compat_floppy_drive_params v;
3784 memset(&v, 0, sizeof(struct compat_floppy_drive_params));
3785 mutex_lock(&floppy_mutex);
3787 v.max_dtr = UDP->max_dtr;
3791 v.spinup = UDP->spinup;
3792 v.spindown = UDP->spindown;
3793 v.spindown_offset = UDP->spindown_offset;
3794 v.select_delay = UDP->select_delay;
3796 v.tracks = UDP->tracks;
3797 v.timeout = UDP->timeout;
3798 v.interleave_sect = UDP->interleave_sect;
3799 v.max_errors = UDP->max_errors;
3800 v.flags = UDP->flags;
3801 v.read_track = UDP->read_track;
3802 memcpy(v.autodetect, UDP->autodetect, sizeof(v.autodetect));
3803 v.checkfreq = UDP->checkfreq;
3804 v.native_format = UDP->native_format;
3805 mutex_unlock(&floppy_mutex);
3807 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
3812 static int compat_getdrvstat(int drive, bool poll,
3813 struct compat_floppy_drive_struct __user *arg)
3815 struct compat_floppy_drive_struct v;
3817 memset(&v, 0, sizeof(struct compat_floppy_drive_struct));
3818 mutex_lock(&floppy_mutex);
3821 if (lock_fdc(drive))
3823 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3825 process_fd_request();
3827 v.spinup_date = UDRS->spinup_date;
3828 v.select_date = UDRS->select_date;
3829 v.first_read_date = UDRS->first_read_date;
3830 v.probed_format = UDRS->probed_format;
3831 v.track = UDRS->track;
3832 v.maxblock = UDRS->maxblock;
3833 v.maxtrack = UDRS->maxtrack;
3834 v.generation = UDRS->generation;
3835 v.keep_data = UDRS->keep_data;
3836 v.fd_ref = UDRS->fd_ref;
3837 v.fd_device = UDRS->fd_device;
3838 v.last_checked = UDRS->last_checked;
3839 v.dmabuf = (uintptr_t)UDRS->dmabuf;
3840 v.bufblocks = UDRS->bufblocks;
3841 mutex_unlock(&floppy_mutex);
3843 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
3847 mutex_unlock(&floppy_mutex);
3851 static int compat_getfdcstat(int drive,
3852 struct compat_floppy_fdc_state __user *arg)
3854 struct compat_floppy_fdc_state v32;
3855 struct floppy_fdc_state v;
3857 mutex_lock(&floppy_mutex);
3859 mutex_unlock(&floppy_mutex);
3861 memset(&v32, 0, sizeof(struct compat_floppy_fdc_state));
3862 v32.spec1 = v.spec1;
3863 v32.spec2 = v.spec2;
3865 v32.version = v.version;
3867 v32.address = v.address;
3868 v32.rawcmd = v.rawcmd;
3869 v32.reset = v.reset;
3870 v32.need_configure = v.need_configure;
3871 v32.perp_mode = v.perp_mode;
3872 v32.has_fifo = v.has_fifo;
3873 v32.driver_version = v.driver_version;
3874 memcpy(v32.track, v.track, 4);
3875 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state)))
3880 static int compat_werrorget(int drive,
3881 struct compat_floppy_write_errors __user *arg)
3883 struct compat_floppy_write_errors v32;
3884 struct floppy_write_errors v;
3886 memset(&v32, 0, sizeof(struct compat_floppy_write_errors));
3887 mutex_lock(&floppy_mutex);
3889 mutex_unlock(&floppy_mutex);
3890 v32.write_errors = v.write_errors;
3891 v32.first_error_sector = v.first_error_sector;
3892 v32.first_error_generation = v.first_error_generation;
3893 v32.last_error_sector = v.last_error_sector;
3894 v32.last_error_generation = v.last_error_generation;
3895 v32.badness = v.badness;
3896 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors)))
3901 static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3902 unsigned long param)
3904 int drive = (long)bdev->bd_disk->private_data;
3908 case FDSETEMSGTRESH:
3916 return fd_ioctl(bdev, mode, cmd, param);
3923 return fd_ioctl(bdev, mode, cmd,
3924 (unsigned long)compat_ptr(param));
3927 return compat_set_geometry(bdev, mode, cmd, compat_ptr(param));
3929 return compat_get_prm(drive, compat_ptr(param));
3931 return compat_setdrvprm(drive, compat_ptr(param));
3933 return compat_getdrvprm(drive, compat_ptr(param));
3934 case FDPOLLDRVSTAT32:
3935 return compat_getdrvstat(drive, true, compat_ptr(param));
3936 case FDGETDRVSTAT32:
3937 return compat_getdrvstat(drive, false, compat_ptr(param));
3938 case FDGETFDCSTAT32:
3939 return compat_getfdcstat(drive, compat_ptr(param));
3941 return compat_werrorget(drive, compat_ptr(param));
3947 static void __init config_types(void)
3949 bool has_drive = false;
3952 /* read drive info out of physical CMOS */
3955 UDP->cmos = FLOPPY0_TYPE;
3958 UDP->cmos = FLOPPY1_TYPE;
3960 /* FIXME: additional physical CMOS drive detection should go here */
3962 for (drive = 0; drive < N_DRIVE; drive++) {
3963 unsigned int type = UDP->cmos;
3964 struct floppy_drive_params *params;
3965 const char *name = NULL;
3968 if (type < ARRAY_SIZE(default_drive_params)) {
3969 params = &default_drive_params[type].params;
3971 name = default_drive_params[type].name;
3972 allowed_drive_mask |= 1 << drive;
3974 allowed_drive_mask &= ~(1 << drive);
3976 params = &default_drive_params[0].params;
3977 snprintf(temparea, sizeof(temparea),
3978 "unknown type %d (usb?)", type);
3982 const char *prepend;
3986 pr_info("Floppy drive(s):");
3991 pr_cont("%s fd%d is %s", prepend, drive, name);
4000 static void floppy_release(struct gendisk *disk, fmode_t mode)
4002 int drive = (long)disk->private_data;
4004 mutex_lock(&floppy_mutex);
4005 mutex_lock(&open_lock);
4006 if (!UDRS->fd_ref--) {
4007 DPRINT("floppy_release with fd_ref == 0");
4011 opened_bdev[drive] = NULL;
4012 mutex_unlock(&open_lock);
4013 mutex_unlock(&floppy_mutex);
4017 * floppy_open check for aliasing (/dev/fd0 can be the same as
4018 * /dev/PS0 etc), and disallows simultaneous access to the same
4019 * drive with different device numbers.
4021 static int floppy_open(struct block_device *bdev, fmode_t mode)
4023 int drive = (long)bdev->bd_disk->private_data;
4024 int old_dev, new_dev;
4029 mutex_lock(&floppy_mutex);
4030 mutex_lock(&open_lock);
4031 old_dev = UDRS->fd_device;
4032 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
4035 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
4036 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4037 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4042 opened_bdev[drive] = bdev;
4046 if (!floppy_track_buffer) {
4047 /* if opening an ED drive, reserve a big buffer,
4048 * else reserve a small one */
4049 if ((UDP->cmos == 6) || (UDP->cmos == 5))
4050 try = 64; /* Only 48 actually useful */
4052 try = 32; /* Only 24 actually useful */
4054 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4055 if (!tmp && !floppy_track_buffer) {
4056 try >>= 1; /* buffer only one side */
4058 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4060 if (!tmp && !floppy_track_buffer)
4061 fallback_on_nodma_alloc(&tmp, 2048 * try);
4062 if (!tmp && !floppy_track_buffer) {
4063 DPRINT("Unable to allocate DMA memory\n");
4066 if (floppy_track_buffer) {
4068 fd_dma_mem_free((unsigned long)tmp, try * 1024);
4070 buffer_min = buffer_max = -1;
4071 floppy_track_buffer = tmp;
4072 max_buffer_sectors = try;
4076 new_dev = MINOR(bdev->bd_dev);
4077 UDRS->fd_device = new_dev;
4078 set_capacity(disks[drive], floppy_sizes[new_dev]);
4079 if (old_dev != -1 && old_dev != new_dev) {
4080 if (buffer_drive == drive)
4084 if (UFDCS->rawcmd == 1)
4087 if (!(mode & FMODE_NDELAY)) {
4088 if (mode & (FMODE_READ|FMODE_WRITE)) {
4089 UDRS->last_checked = 0;
4090 clear_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
4091 check_disk_change(bdev);
4092 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
4094 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags))
4098 if ((mode & FMODE_WRITE) &&
4099 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
4102 mutex_unlock(&open_lock);
4103 mutex_unlock(&floppy_mutex);
4109 opened_bdev[drive] = NULL;
4111 mutex_unlock(&open_lock);
4112 mutex_unlock(&floppy_mutex);
4117 * Check if the disk has been changed or if a change has been faked.
4119 static unsigned int floppy_check_events(struct gendisk *disk,
4120 unsigned int clearing)
4122 int drive = (long)disk->private_data;
4124 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4125 test_bit(FD_VERIFY_BIT, &UDRS->flags))
4126 return DISK_EVENT_MEDIA_CHANGE;
4128 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
4129 if (lock_fdc(drive))
4131 poll_drive(false, 0);
4132 process_fd_request();
4135 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4136 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
4137 test_bit(drive, &fake_change) ||
4138 drive_no_geom(drive))
4139 return DISK_EVENT_MEDIA_CHANGE;
4144 * This implements "read block 0" for floppy_revalidate().
4145 * Needed for format autodetection, checking whether there is
4146 * a disk in the drive, and whether that disk is writable.
4151 struct completion complete;
4154 static void floppy_rb0_cb(struct bio *bio)
4156 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private;
4157 int drive = cbdata->drive;
4159 if (bio->bi_status) {
4160 pr_info("floppy: error %d while reading block 0\n",
4162 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
4164 complete(&cbdata->complete);
4167 static int __floppy_read_block_0(struct block_device *bdev, int drive)
4170 struct bio_vec bio_vec;
4172 struct rb0_cbdata cbdata;
4175 page = alloc_page(GFP_NOIO);
4177 process_fd_request();
4181 size = bdev->bd_block_size;
4185 cbdata.drive = drive;
4187 bio_init(&bio, &bio_vec, 1);
4188 bio_set_dev(&bio, bdev);
4189 bio_add_page(&bio, page, size, 0);
4191 bio.bi_iter.bi_sector = 0;
4192 bio.bi_flags |= (1 << BIO_QUIET);
4193 bio.bi_private = &cbdata;
4194 bio.bi_end_io = floppy_rb0_cb;
4195 bio_set_op_attrs(&bio, REQ_OP_READ, 0);
4197 init_completion(&cbdata.complete);
4200 process_fd_request();
4202 wait_for_completion(&cbdata.complete);
4209 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
4210 * the bootblock (block 0). "Autodetection" is also needed to check whether
4211 * there is a disk in the drive at all... Thus we also do it for fixed
4212 * geometry formats */
4213 static int floppy_revalidate(struct gendisk *disk)
4215 int drive = (long)disk->private_data;
4219 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4220 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
4221 test_bit(drive, &fake_change) ||
4222 drive_no_geom(drive)) {
4223 if (WARN(atomic_read(&usage_count) == 0,
4224 "VFS: revalidate called on non-open device.\n"))
4227 res = lock_fdc(drive);
4230 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4231 test_bit(FD_VERIFY_BIT, &UDRS->flags));
4232 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
4233 process_fd_request(); /*already done by another thread */
4238 if (buffer_drive == drive)
4240 clear_bit(drive, &fake_change);
4241 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4244 if (drive_no_geom(drive)) {
4246 res = __floppy_read_block_0(opened_bdev[drive], drive);
4249 poll_drive(false, FD_RAW_NEED_DISK);
4250 process_fd_request();
4253 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
4257 static const struct block_device_operations floppy_fops = {
4258 .owner = THIS_MODULE,
4259 .open = floppy_open,
4260 .release = floppy_release,
4262 .getgeo = fd_getgeo,
4263 .check_events = floppy_check_events,
4264 .revalidate_disk = floppy_revalidate,
4265 #ifdef CONFIG_COMPAT
4266 .compat_ioctl = fd_compat_ioctl,
4271 * Floppy Driver initialization
4272 * =============================
4275 /* Determine the floppy disk controller type */
4276 /* This routine was written by David C. Niemi */
4277 static char __init get_fdc_version(void)
4281 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
4286 return FDC_NONE; /* No FDC present ??? */
4287 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4288 pr_info("FDC %d is an 8272A\n", fdc);
4289 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
4292 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
4297 if (!fdc_configure()) {
4298 pr_info("FDC %d is an 82072\n", fdc);
4299 return FDC_82072; /* 82072 doesn't know CONFIGURE */
4302 output_byte(FD_PERPENDICULAR);
4303 if (need_more_output() == MORE_OUTPUT) {
4306 pr_info("FDC %d is an 82072A\n", fdc);
4307 return FDC_82072A; /* 82072A as found on Sparcs. */
4310 output_byte(FD_UNLOCK);
4312 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4313 pr_info("FDC %d is a pre-1991 82077\n", fdc);
4314 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
4317 if ((r != 1) || (reply_buffer[0] != 0x00)) {
4318 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
4322 output_byte(FD_PARTID);
4325 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
4329 if (reply_buffer[0] == 0x80) {
4330 pr_info("FDC %d is a post-1991 82077\n", fdc);
4331 return FDC_82077; /* Revised 82077AA passes all the tests */
4333 switch (reply_buffer[0] >> 5) {
4335 /* Either a 82078-1 or a 82078SL running at 5Volt */
4336 pr_info("FDC %d is an 82078.\n", fdc);
4339 pr_info("FDC %d is a 44pin 82078\n", fdc);
4342 pr_info("FDC %d is a S82078B\n", fdc);
4345 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
4348 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4349 fdc, reply_buffer[0] >> 5);
4350 return FDC_82078_UNKN;
4352 } /* get_fdc_version */
4354 /* lilo configuration */
4356 static void __init floppy_set_flags(int *ints, int param, int param2)
4360 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4362 default_drive_params[i].params.flags |= param2;
4364 default_drive_params[i].params.flags &= ~param2;
4366 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4369 static void __init daring(int *ints, int param, int param2)
4373 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4375 default_drive_params[i].params.select_delay = 0;
4376 default_drive_params[i].params.flags |=
4377 FD_SILENT_DCL_CLEAR;
4379 default_drive_params[i].params.select_delay =
4381 default_drive_params[i].params.flags &=
4382 ~FD_SILENT_DCL_CLEAR;
4385 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4388 static void __init set_cmos(int *ints, int dummy, int dummy2)
4390 int current_drive = 0;
4393 DPRINT("wrong number of parameters for CMOS\n");
4396 current_drive = ints[1];
4397 if (current_drive < 0 || current_drive >= 8) {
4398 DPRINT("bad drive for set_cmos\n");
4402 if (current_drive >= 4 && !FDC2)
4406 DPRINT("setting CMOS code to %d\n", ints[2]);
4409 static struct param_table {
4411 void (*fn) (int *ints, int param, int param2);
4415 } config_params[] __initdata = {
4416 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4417 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4418 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4419 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4420 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4421 {"daring", daring, NULL, 1, 0},
4423 {"two_fdc", NULL, &FDC2, 0x370, 0},
4424 {"one_fdc", NULL, &FDC2, 0, 0},
4426 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4427 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4428 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4429 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4430 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4431 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4432 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4433 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4434 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4435 {"nofifo", NULL, &no_fifo, 0x20, 0},
4436 {"usefifo", NULL, &no_fifo, 0, 0},
4437 {"cmos", set_cmos, NULL, 0, 0},
4438 {"slow", NULL, &slow_floppy, 1, 0},
4439 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4440 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4441 {"L40SX", NULL, &print_unex, 0, 0}
4446 static int __init floppy_setup(char *str)
4452 str = get_options(str, ARRAY_SIZE(ints), ints);
4454 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4455 if (strcmp(str, config_params[i].name) == 0) {
4459 param = config_params[i].def_param;
4460 if (config_params[i].fn)
4461 config_params[i].fn(ints, param,
4464 if (config_params[i].var) {
4465 DPRINT("%s=%d\n", str, param);
4466 *config_params[i].var = param;
4473 DPRINT("unknown floppy option [%s]\n", str);
4475 DPRINT("allowed options are:");
4476 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4477 pr_cont(" %s", config_params[i].name);
4480 DPRINT("botched floppy option\n");
4481 DPRINT("Read Documentation/admin-guide/blockdev/floppy.rst\n");
4485 static int have_no_fdc = -ENODEV;
4487 static ssize_t floppy_cmos_show(struct device *dev,
4488 struct device_attribute *attr, char *buf)
4490 struct platform_device *p = to_platform_device(dev);
4494 return sprintf(buf, "%X\n", UDP->cmos);
4497 static DEVICE_ATTR(cmos, 0444, floppy_cmos_show, NULL);
4499 static struct attribute *floppy_dev_attrs[] = {
4500 &dev_attr_cmos.attr,
4504 ATTRIBUTE_GROUPS(floppy_dev);
4506 static void floppy_device_release(struct device *dev)
4510 static int floppy_resume(struct device *dev)
4514 for (fdc = 0; fdc < N_FDC; fdc++)
4515 if (FDCS->address != -1)
4516 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4521 static const struct dev_pm_ops floppy_pm_ops = {
4522 .resume = floppy_resume,
4523 .restore = floppy_resume,
4526 static struct platform_driver floppy_driver = {
4529 .pm = &floppy_pm_ops,
4533 static const struct blk_mq_ops floppy_mq_ops = {
4534 .queue_rq = floppy_queue_rq,
4537 static struct platform_device floppy_device[N_DRIVE];
4539 static bool floppy_available(int drive)
4541 if (!(allowed_drive_mask & (1 << drive)))
4543 if (fdc_state[FDC(drive)].version == FDC_NONE)
4548 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4550 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4551 if (drive >= N_DRIVE || !floppy_available(drive))
4553 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4556 return get_disk_and_module(disks[drive]);
4559 static int __init do_floppy_init(void)
4561 int i, unit, drive, err;
4564 interruptjiffies = resultjiffies = jiffies;
4566 #if defined(CONFIG_PPC)
4567 if (check_legacy_ioport(FDC1))
4573 floppy_wq = alloc_ordered_workqueue("floppy", 0);
4577 for (drive = 0; drive < N_DRIVE; drive++) {
4578 disks[drive] = alloc_disk(1);
4579 if (!disks[drive]) {
4584 disks[drive]->queue = blk_mq_init_sq_queue(&tag_sets[drive],
4586 BLK_MQ_F_SHOULD_MERGE);
4587 if (IS_ERR(disks[drive]->queue)) {
4588 err = PTR_ERR(disks[drive]->queue);
4589 disks[drive]->queue = NULL;
4593 blk_queue_bounce_limit(disks[drive]->queue, BLK_BOUNCE_HIGH);
4594 blk_queue_max_hw_sectors(disks[drive]->queue, 64);
4595 disks[drive]->major = FLOPPY_MAJOR;
4596 disks[drive]->first_minor = TOMINOR(drive);
4597 disks[drive]->fops = &floppy_fops;
4598 disks[drive]->events = DISK_EVENT_MEDIA_CHANGE;
4599 sprintf(disks[drive]->disk_name, "fd%d", drive);
4601 timer_setup(&motor_off_timer[drive], motor_off_callback, 0);
4604 err = register_blkdev(FLOPPY_MAJOR, "fd");
4608 err = platform_driver_register(&floppy_driver);
4610 goto out_unreg_blkdev;
4612 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4613 floppy_find, NULL, NULL);
4615 for (i = 0; i < 256; i++)
4617 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4619 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4621 reschedule_timeout(MAXTIMEOUT, "floppy init");
4624 for (i = 0; i < N_FDC; i++) {
4626 memset(FDCS, 0, sizeof(*FDCS));
4629 #if defined(__sparc__) || defined(__mc68000__)
4630 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4634 FDCS->version = FDC_82072A;
4638 use_virtual_dma = can_use_virtual_dma & 1;
4639 fdc_state[0].address = FDC1;
4640 if (fdc_state[0].address == -1) {
4641 cancel_delayed_work(&fd_timeout);
4643 goto out_unreg_region;
4646 fdc_state[1].address = FDC2;
4649 fdc = 0; /* reset fdc in case of unexpected interrupt */
4650 err = floppy_grab_irq_and_dma();
4652 cancel_delayed_work(&fd_timeout);
4654 goto out_unreg_region;
4657 /* initialise drive state */
4658 for (drive = 0; drive < N_DRIVE; drive++) {
4659 memset(UDRS, 0, sizeof(*UDRS));
4660 memset(UDRWE, 0, sizeof(*UDRWE));
4661 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4662 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4663 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4664 UDRS->fd_device = -1;
4665 floppy_track_buffer = NULL;
4666 max_buffer_sectors = 0;
4669 * Small 10 msec delay to let through any interrupt that
4670 * initialization might have triggered, to not
4671 * confuse detection:
4675 for (i = 0; i < N_FDC; i++) {
4677 FDCS->driver_version = FD_DRIVER_VERSION;
4678 for (unit = 0; unit < 4; unit++)
4679 FDCS->track[unit] = 0;
4680 if (FDCS->address == -1)
4683 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4684 /* free ioports reserved by floppy_grab_irq_and_dma() */
4685 floppy_release_regions(fdc);
4687 FDCS->version = FDC_NONE;
4690 /* Try to determine the floppy controller type */
4691 FDCS->version = get_fdc_version();
4692 if (FDCS->version == FDC_NONE) {
4693 /* free ioports reserved by floppy_grab_irq_and_dma() */
4694 floppy_release_regions(fdc);
4698 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4699 can_use_virtual_dma = 0;
4702 /* Not all FDCs seem to be able to handle the version command
4703 * properly, so force a reset for the standard FDC clones,
4704 * to avoid interrupt garbage.
4706 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4709 cancel_delayed_work(&fd_timeout);
4713 DPRINT("no floppy controllers found\n");
4715 goto out_release_dma;
4718 for (drive = 0; drive < N_DRIVE; drive++) {
4719 if (!floppy_available(drive))
4722 floppy_device[drive].name = floppy_device_name;
4723 floppy_device[drive].id = drive;
4724 floppy_device[drive].dev.release = floppy_device_release;
4725 floppy_device[drive].dev.groups = floppy_dev_groups;
4727 err = platform_device_register(&floppy_device[drive]);
4729 goto out_remove_drives;
4731 /* to be cleaned up... */
4732 disks[drive]->private_data = (void *)(long)drive;
4733 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4734 device_add_disk(&floppy_device[drive].dev, disks[drive], NULL);
4741 if (floppy_available(drive)) {
4742 del_gendisk(disks[drive]);
4743 platform_device_unregister(&floppy_device[drive]);
4747 if (atomic_read(&usage_count))
4748 floppy_release_irq_and_dma();
4750 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4751 platform_driver_unregister(&floppy_driver);
4753 unregister_blkdev(FLOPPY_MAJOR, "fd");
4755 destroy_workqueue(floppy_wq);
4756 for (drive = 0; drive < N_DRIVE; drive++) {
4759 if (disks[drive]->queue) {
4760 del_timer_sync(&motor_off_timer[drive]);
4761 blk_cleanup_queue(disks[drive]->queue);
4762 disks[drive]->queue = NULL;
4763 blk_mq_free_tag_set(&tag_sets[drive]);
4765 put_disk(disks[drive]);
4771 static __init void floppy_async_init(void *data, async_cookie_t cookie)
4777 static int __init floppy_init(void)
4780 return do_floppy_init();
4782 /* Don't hold up the bootup by the floppy initialization */
4783 async_schedule(floppy_async_init, NULL);
4788 static const struct io_region {
4793 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4795 /* address + 6 is reserved, and may be taken by IDE.
4796 * Unfortunately, Adaptec doesn't know this :-(, */
4800 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4802 while (p != io_regions) {
4804 release_region(FDCS->address + p->offset, p->size);
4808 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4810 static int floppy_request_regions(int fdc)
4812 const struct io_region *p;
4814 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4815 if (!request_region(FDCS->address + p->offset,
4816 p->size, "floppy")) {
4817 DPRINT("Floppy io-port 0x%04lx in use\n",
4818 FDCS->address + p->offset);
4819 floppy_release_allocated_regions(fdc, p);
4826 static void floppy_release_regions(int fdc)
4828 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4831 static int floppy_grab_irq_and_dma(void)
4833 if (atomic_inc_return(&usage_count) > 1)
4837 * We might have scheduled a free_irq(), wait it to
4840 flush_workqueue(floppy_wq);
4842 if (fd_request_irq()) {
4843 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4845 atomic_dec(&usage_count);
4848 if (fd_request_dma()) {
4849 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4851 if (can_use_virtual_dma & 2)
4852 use_virtual_dma = can_use_virtual_dma = 1;
4853 if (!(can_use_virtual_dma & 1)) {
4855 atomic_dec(&usage_count);
4860 for (fdc = 0; fdc < N_FDC; fdc++) {
4861 if (FDCS->address != -1) {
4862 if (floppy_request_regions(fdc))
4866 for (fdc = 0; fdc < N_FDC; fdc++) {
4867 if (FDCS->address != -1) {
4869 fd_outb(FDCS->dor, FD_DOR);
4873 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4875 for (fdc = 0; fdc < N_FDC; fdc++)
4876 if (FDCS->address != -1)
4877 fd_outb(FDCS->dor, FD_DOR);
4879 * The driver will try and free resources and relies on us
4880 * to know if they were allocated or not.
4883 irqdma_allocated = 1;
4889 floppy_release_regions(fdc);
4890 atomic_dec(&usage_count);
4894 static void floppy_release_irq_and_dma(void)
4901 unsigned long tmpaddr;
4903 if (!atomic_dec_and_test(&usage_count))
4906 if (irqdma_allocated) {
4910 irqdma_allocated = 0;
4917 if (floppy_track_buffer && max_buffer_sectors) {
4918 tmpsize = max_buffer_sectors * 1024;
4919 tmpaddr = (unsigned long)floppy_track_buffer;
4920 floppy_track_buffer = NULL;
4921 max_buffer_sectors = 0;
4922 buffer_min = buffer_max = -1;
4923 fd_dma_mem_free(tmpaddr, tmpsize);
4926 for (drive = 0; drive < N_FDC * 4; drive++)
4927 if (timer_pending(motor_off_timer + drive))
4928 pr_info("motor off timer %d still active\n", drive);
4931 if (delayed_work_pending(&fd_timeout))
4932 pr_info("floppy timer still active:%s\n", timeout_message);
4933 if (delayed_work_pending(&fd_timer))
4934 pr_info("auxiliary floppy timer still active\n");
4935 if (work_pending(&floppy_work))
4936 pr_info("work still pending\n");
4938 for (fdc = 0; fdc < N_FDC; fdc++)
4939 if (FDCS->address != -1)
4940 floppy_release_regions(fdc);
4946 static char *floppy;
4948 static void __init parse_floppy_cfg_string(char *cfg)
4954 while (*cfg && *cfg != ' ' && *cfg != '\t')
4965 static int __init floppy_module_init(void)
4968 parse_floppy_cfg_string(floppy);
4969 return floppy_init();
4971 module_init(floppy_module_init);
4973 static void __exit floppy_module_exit(void)
4977 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4978 unregister_blkdev(FLOPPY_MAJOR, "fd");
4979 platform_driver_unregister(&floppy_driver);
4981 destroy_workqueue(floppy_wq);
4983 for (drive = 0; drive < N_DRIVE; drive++) {
4984 del_timer_sync(&motor_off_timer[drive]);
4986 if (floppy_available(drive)) {
4987 del_gendisk(disks[drive]);
4988 platform_device_unregister(&floppy_device[drive]);
4990 blk_cleanup_queue(disks[drive]->queue);
4991 blk_mq_free_tag_set(&tag_sets[drive]);
4994 * These disks have not called add_disk(). Don't put down
4995 * queue reference in put_disk().
4997 if (!(allowed_drive_mask & (1 << drive)) ||
4998 fdc_state[FDC(drive)].version == FDC_NONE)
4999 disks[drive]->queue = NULL;
5001 put_disk(disks[drive]);
5004 cancel_delayed_work_sync(&fd_timeout);
5005 cancel_delayed_work_sync(&fd_timer);
5007 if (atomic_read(&usage_count))
5008 floppy_release_irq_and_dma();
5010 /* eject disk, if any */
5014 module_exit(floppy_module_exit);
5016 module_param(floppy, charp, 0);
5017 module_param(FLOPPY_IRQ, int, 0);
5018 module_param(FLOPPY_DMA, int, 0);
5019 MODULE_AUTHOR("Alain L. Knaff");
5020 MODULE_SUPPORTED_DEVICE("fd");
5021 MODULE_LICENSE("GPL");
5023 /* This doesn't actually get used other than for module information */
5024 static const struct pnp_device_id floppy_pnpids[] = {
5029 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
5033 __setup("floppy=", floppy_setup);
5034 module_init(floppy_init)
5037 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);