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>
174 #include <linux/fdreg.h>
175 #include <linux/fd.h>
176 #include <linux/hdreg.h>
177 #include <linux/errno.h>
178 #include <linux/slab.h>
179 #include <linux/mm.h>
180 #include <linux/bio.h>
181 #include <linux/string.h>
182 #include <linux/jiffies.h>
183 #include <linux/fcntl.h>
184 #include <linux/delay.h>
185 #include <linux/mc146818rtc.h> /* CMOS defines */
186 #include <linux/ioport.h>
187 #include <linux/interrupt.h>
188 #include <linux/init.h>
189 #include <linux/platform_device.h>
190 #include <linux/mod_devicetable.h>
191 #include <linux/mutex.h>
192 #include <linux/io.h>
193 #include <linux/uaccess.h>
194 #include <linux/async.h>
195 #include <linux/compat.h>
198 * PS/2 floppies have much slower step rates than regular floppies.
199 * It's been recommended that take about 1/4 of the default speed
200 * in some more extreme cases.
202 static DEFINE_MUTEX(floppy_mutex);
203 static int slow_floppy;
208 static int FLOPPY_IRQ = 6;
209 static int FLOPPY_DMA = 2;
210 static int can_use_virtual_dma = 2;
212 * can use virtual DMA:
213 * 0 = use of virtual DMA disallowed by config
214 * 1 = use of virtual DMA prescribed by config
215 * 2 = no virtual DMA preference configured. By default try hard DMA,
216 * but fall back on virtual DMA when not enough memory available
219 static int use_virtual_dma;
223 * 1 using virtual DMA
224 * This variable is set to virtual when a DMA mem problem arises, and
225 * reset back in floppy_grab_irq_and_dma.
226 * It is not safe to reset it in other circumstances, because the floppy
227 * driver may have several buffers in use at once, and we do currently not
228 * record each buffers capabilities
231 static DEFINE_SPINLOCK(floppy_lock);
233 static unsigned short virtual_dma_port = 0x3f0;
234 irqreturn_t floppy_interrupt(int irq, void *dev_id);
235 static int set_dor(int fdc, char mask, char data);
237 #define K_64 0x10000 /* 64KB */
239 /* the following is the mask of allowed drives. By default units 2 and
240 * 3 of both floppy controllers are disabled, because switching on the
241 * motor of these drives causes system hangs on some PCI computers. drive
242 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
243 * a drive is allowed.
245 * NOTE: This must come before we include the arch floppy header because
246 * some ports reference this variable from there. -DaveM
249 static int allowed_drive_mask = 0x33;
251 #include <asm/floppy.h>
253 static int irqdma_allocated;
255 #include <linux/blk-mq.h>
256 #include <linux/blkpg.h>
257 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
258 #include <linux/completion.h>
260 static LIST_HEAD(floppy_reqs);
261 static struct request *current_req;
262 static int set_next_request(void);
264 #ifndef fd_get_dma_residue
265 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
268 /* Dma Memory related stuff */
270 #ifndef fd_dma_mem_free
271 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
274 #ifndef fd_dma_mem_alloc
275 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
278 #ifndef fd_cacheflush
279 #define fd_cacheflush(addr, size) /* nothing... */
282 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
284 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
286 return; /* we have the memory */
287 if (can_use_virtual_dma != 2)
288 return; /* no fallback allowed */
289 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
290 *addr = (char *)nodma_mem_alloc(l);
296 /* End dma memory related stuff */
298 static unsigned long fake_change;
299 static bool initialized;
301 #define ITYPE(x) (((x) >> 2) & 0x1f)
302 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
303 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
304 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
305 /* reverse mapping from unit and fdc to drive */
306 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
308 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
309 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
311 /* read/write commands */
318 #define SECT_PER_TRACK 6
323 /* format commands */
325 #define F_SECT_PER_TRACK 3
331 * Maximum disk size (in kilobytes).
332 * This default is used whenever the current disk size is unknown.
333 * [Now it is rather a minimum]
335 #define MAX_DISK_SIZE 4 /* 3984 */
338 * globals used by 'result()'
340 static unsigned char reply_buffer[FD_RAW_REPLY_SIZE];
341 static int inr; /* size of reply buffer, when called from interrupt */
345 #define ST3 0 /* result of GETSTATUS */
351 #define SEL_DLY (2 * HZ / 100)
354 * this struct defines the different floppy drive types.
357 struct floppy_drive_params params;
358 const char *name; /* name printed while booting */
359 } default_drive_params[] = {
360 /* NOTE: the time values in jiffies should be in msec!
362 | Maximum data rate supported by drive type
363 | | Head load time, msec
364 | | | Head unload time, msec (not used)
365 | | | | Step rate interval, usec
366 | | | | | Time needed for spinup time (jiffies)
367 | | | | | | Timeout for spinning down (jiffies)
368 | | | | | | | Spindown offset (where disk stops)
369 | | | | | | | | Select delay
370 | | | | | | | | | RPS
371 | | | | | | | | | | Max number of tracks
372 | | | | | | | | | | | Interrupt timeout
373 | | | | | | | | | | | | Max nonintlv. sectors
374 | | | | | | | | | | | | | -Max Errors- flags */
375 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
376 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
378 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
379 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
381 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
382 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
384 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
385 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
387 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
388 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
390 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
391 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
393 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
394 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
395 /* | --autodetected formats--- | | |
396 * read_track | | Name printed when booting
398 * Frequency of disk change checks */
401 static struct floppy_drive_params drive_params[N_DRIVE];
402 static struct floppy_drive_struct drive_state[N_DRIVE];
403 static struct floppy_write_errors write_errors[N_DRIVE];
404 static struct timer_list motor_off_timer[N_DRIVE];
405 static struct blk_mq_tag_set tag_sets[N_DRIVE];
406 static struct block_device *opened_bdev[N_DRIVE];
407 static DEFINE_MUTEX(open_lock);
408 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
411 * This struct defines the different floppy types.
413 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
414 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
415 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
416 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
417 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
418 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
419 * side 0 is on physical side 0 (but with the misnamed sector IDs).
420 * 'stretch' should probably be renamed to something more general, like
423 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
424 * The LSB (bit 2) is flipped. For most disks, the first sector
425 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
426 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
427 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
429 * Other parameters should be self-explanatory (see also setfdprm(8)).
438 | | | | | | Data rate, | 0x40 for perp
439 | | | | | | | Spec1 (stepping rate, head unload
440 | | | | | | | | /fmt gap (gap2) */
441 static struct floppy_struct floppy_type[32] = {
442 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
443 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
444 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
445 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
446 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
447 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
448 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
449 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
450 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
451 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
453 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
454 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
455 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
456 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
457 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
458 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
459 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
460 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
461 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
462 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
464 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
465 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
466 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
467 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
468 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
469 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
470 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
471 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
472 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
473 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
475 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
476 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
479 static struct gendisk *disks[N_DRIVE][ARRAY_SIZE(floppy_type)];
481 #define SECTSIZE (_FD_SECTSIZE(*floppy))
483 /* Auto-detection: Disk type used until the next media change occurs. */
484 static struct floppy_struct *current_type[N_DRIVE];
487 * User-provided type information. current_type points to
488 * the respective entry of this array.
490 static struct floppy_struct user_params[N_DRIVE];
492 static sector_t floppy_sizes[256];
494 static char floppy_device_name[] = "floppy";
497 * The driver is trying to determine the correct media format
498 * while probing is set. rw_interrupt() clears it after a
503 /* Synchronization of FDC access. */
504 #define FD_COMMAND_NONE -1
505 #define FD_COMMAND_ERROR 2
506 #define FD_COMMAND_OKAY 3
508 static volatile int command_status = FD_COMMAND_NONE;
509 static unsigned long fdc_busy;
510 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
511 static DECLARE_WAIT_QUEUE_HEAD(command_done);
513 /* Errors during formatting are counted here. */
514 static int format_errors;
516 /* Format request descriptor. */
517 static struct format_descr format_req;
520 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
521 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
522 * H is head unload time (1=16ms, 2=32ms, etc)
527 * Because these are written to by the DMA controller, they must
528 * not contain a 64k byte boundary crossing, or data will be
531 static char *floppy_track_buffer;
532 static int max_buffer_sectors;
535 typedef void (*done_f)(int);
536 static const struct cont_t {
537 void (*interrupt)(void);
538 /* this is called after the interrupt of the
540 void (*redo)(void); /* this is called to retry the operation */
541 void (*error)(void); /* this is called to tally an error */
542 done_f done; /* this is called to say if the operation has
543 * succeeded/failed */
546 static void floppy_ready(void);
547 static void floppy_start(void);
548 static void process_fd_request(void);
549 static void recalibrate_floppy(void);
550 static void floppy_shutdown(struct work_struct *);
552 static int floppy_request_regions(int);
553 static void floppy_release_regions(int);
554 static int floppy_grab_irq_and_dma(void);
555 static void floppy_release_irq_and_dma(void);
558 * The "reset" variable should be tested whenever an interrupt is scheduled,
559 * after the commands have been sent. This is to ensure that the driver doesn't
560 * get wedged when the interrupt doesn't come because of a failed command.
561 * reset doesn't need to be tested before sending commands, because
562 * output_byte is automatically disabled when reset is set.
564 static void reset_fdc(void);
565 static int floppy_revalidate(struct gendisk *disk);
568 * These are global variables, as that's the easiest way to give
569 * information to interrupts. They are the data used for the current
573 #define NEED_1_RECAL -2
574 #define NEED_2_RECAL -3
576 static atomic_t usage_count = ATOMIC_INIT(0);
578 /* buffer related variables */
579 static int buffer_track = -1;
580 static int buffer_drive = -1;
581 static int buffer_min = -1;
582 static int buffer_max = -1;
584 /* fdc related variables, should end up in a struct */
585 static struct floppy_fdc_state fdc_state[N_FDC];
586 static int current_fdc; /* current fdc */
588 static struct workqueue_struct *floppy_wq;
590 static struct floppy_struct *_floppy = floppy_type;
591 static unsigned char current_drive;
592 static long current_count_sectors;
593 static unsigned char fsector_t; /* sector in track */
594 static unsigned char in_sector_offset; /* offset within physical sector,
595 * expressed in units of 512 bytes */
597 static inline unsigned char fdc_inb(int fdc, int reg)
599 return fd_inb(fdc_state[fdc].address, reg);
602 static inline void fdc_outb(unsigned char value, int fdc, int reg)
604 fd_outb(value, fdc_state[fdc].address, reg);
607 static inline bool drive_no_geom(int drive)
609 return !current_type[drive] && !ITYPE(drive_state[drive].fd_device);
613 static inline int fd_eject(int drive)
624 static long unsigned debugtimer;
626 static inline void set_debugt(void)
628 debugtimer = jiffies;
631 static inline void debugt(const char *func, const char *msg)
633 if (drive_params[current_drive].flags & DEBUGT)
634 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
637 static inline void set_debugt(void) { }
638 static inline void debugt(const char *func, const char *msg) { }
642 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
643 static const char *timeout_message;
645 static void is_alive(const char *func, const char *message)
647 /* this routine checks whether the floppy driver is "alive" */
648 if (test_bit(0, &fdc_busy) && command_status < 2 &&
649 !delayed_work_pending(&fd_timeout)) {
650 DPRINT("%s: timeout handler died. %s\n", func, message);
654 static void (*do_floppy)(void) = NULL;
658 static void (*lasthandler)(void);
659 static unsigned long interruptjiffies;
660 static unsigned long resultjiffies;
661 static int resultsize;
662 static unsigned long lastredo;
664 static struct output_log {
666 unsigned char status;
667 unsigned long jiffies;
668 } output_log[OLOGSIZE];
670 static int output_log_pos;
672 #define MAXTIMEOUT -2
674 static void __reschedule_timeout(int drive, const char *message)
678 if (drive < 0 || drive >= N_DRIVE) {
682 delay = drive_params[drive].timeout;
684 mod_delayed_work(floppy_wq, &fd_timeout, delay);
685 if (drive_params[drive].flags & FD_DEBUG)
686 DPRINT("reschedule timeout %s\n", message);
687 timeout_message = message;
690 static void reschedule_timeout(int drive, const char *message)
694 spin_lock_irqsave(&floppy_lock, flags);
695 __reschedule_timeout(drive, message);
696 spin_unlock_irqrestore(&floppy_lock, flags);
699 #define INFBOUND(a, b) (a) = max_t(int, a, b)
700 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
703 * Bottom half floppy driver.
704 * ==========================
706 * This part of the file contains the code talking directly to the hardware,
707 * and also the main service loop (seek-configure-spinup-command)
712 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
713 * and the last_checked date.
715 * last_checked is the date of the last check which showed 'no disk change'
716 * FD_DISK_CHANGE is set under two conditions:
717 * 1. The floppy has been changed after some i/o to that floppy already
719 * 2. No floppy disk is in the drive. This is done in order to ensure that
720 * requests are quickly flushed in case there is no disk in the drive. It
721 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
724 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
725 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
726 * each seek. If a disk is present, the disk change line should also be
727 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
728 * change line is set, this means either that no disk is in the drive, or
729 * that it has been removed since the last seek.
731 * This means that we really have a third possibility too:
732 * The floppy has been changed after the last seek.
735 static int disk_change(int drive)
737 int fdc = FDC(drive);
739 if (time_before(jiffies, drive_state[drive].select_date + drive_params[drive].select_delay))
740 DPRINT("WARNING disk change called early\n");
741 if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))) ||
742 (fdc_state[fdc].dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
743 DPRINT("probing disk change on unselected drive\n");
744 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
745 (unsigned int)fdc_state[fdc].dor);
748 debug_dcl(drive_params[drive].flags,
749 "checking disk change line for drive %d\n", drive);
750 debug_dcl(drive_params[drive].flags, "jiffies=%lu\n", jiffies);
751 debug_dcl(drive_params[drive].flags, "disk change line=%x\n",
752 fdc_inb(fdc, FD_DIR) & 0x80);
753 debug_dcl(drive_params[drive].flags, "flags=%lx\n",
754 drive_state[drive].flags);
756 if (drive_params[drive].flags & FD_BROKEN_DCL)
757 return test_bit(FD_DISK_CHANGED_BIT,
758 &drive_state[drive].flags);
759 if ((fdc_inb(fdc, FD_DIR) ^ drive_params[drive].flags) & 0x80) {
760 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
761 /* verify write protection */
763 if (drive_state[drive].maxblock) /* mark it changed */
764 set_bit(FD_DISK_CHANGED_BIT,
765 &drive_state[drive].flags);
767 /* invalidate its geometry */
768 if (drive_state[drive].keep_data >= 0) {
769 if ((drive_params[drive].flags & FTD_MSG) &&
770 current_type[drive] != NULL)
771 DPRINT("Disk type is undefined after disk change\n");
772 current_type[drive] = NULL;
773 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
778 drive_state[drive].last_checked = jiffies;
779 clear_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags);
784 static inline int is_selected(int dor, int unit)
786 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
789 static bool is_ready_state(int status)
791 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
792 return state == STATUS_READY;
795 static int set_dor(int fdc, char mask, char data)
799 unsigned char newdor;
800 unsigned char olddor;
802 if (fdc_state[fdc].address == -1)
805 olddor = fdc_state[fdc].dor;
806 newdor = (olddor & mask) | data;
807 if (newdor != olddor) {
809 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
810 drive = REVDRIVE(fdc, unit);
811 debug_dcl(drive_params[drive].flags,
812 "calling disk change from set_dor\n");
815 fdc_state[fdc].dor = newdor;
816 fdc_outb(newdor, fdc, FD_DOR);
819 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
820 drive = REVDRIVE(fdc, unit);
821 drive_state[drive].select_date = jiffies;
827 static void twaddle(int fdc, int drive)
829 if (drive_params[drive].select_delay)
831 fdc_outb(fdc_state[fdc].dor & ~(0x10 << UNIT(drive)),
833 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
834 drive_state[drive].select_date = jiffies;
838 * Reset all driver information about the specified fdc.
839 * This is needed after a reset, and after a raw command.
841 static void reset_fdc_info(int fdc, int mode)
845 fdc_state[fdc].spec1 = fdc_state[fdc].spec2 = -1;
846 fdc_state[fdc].need_configure = 1;
847 fdc_state[fdc].perp_mode = 1;
848 fdc_state[fdc].rawcmd = 0;
849 for (drive = 0; drive < N_DRIVE; drive++)
850 if (FDC(drive) == fdc &&
851 (mode || drive_state[drive].track != NEED_1_RECAL))
852 drive_state[drive].track = NEED_2_RECAL;
856 * selects the fdc and drive, and enables the fdc's input/dma.
857 * Both current_drive and current_fdc are changed to match the new drive.
859 static void set_fdc(int drive)
863 if (drive < 0 || drive >= N_DRIVE) {
864 pr_info("bad drive value %d\n", drive);
870 pr_info("bad fdc value\n");
876 set_dor(1 - fdc, ~8, 0);
878 if (fdc_state[fdc].rawcmd == 2)
879 reset_fdc_info(fdc, 1);
880 if (fdc_inb(fdc, FD_STATUS) != STATUS_READY)
881 fdc_state[fdc].reset = 1;
883 current_drive = drive;
889 * Both current_drive and current_fdc are changed to match the new drive.
891 static int lock_fdc(int drive)
893 if (WARN(atomic_read(&usage_count) == 0,
894 "Trying to lock fdc while usage count=0\n"))
897 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
900 command_status = FD_COMMAND_NONE;
902 reschedule_timeout(drive, "lock fdc");
907 /* unlocks the driver */
908 static void unlock_fdc(void)
910 if (!test_bit(0, &fdc_busy))
911 DPRINT("FDC access conflict!\n");
914 command_status = FD_COMMAND_NONE;
915 cancel_delayed_work(&fd_timeout);
918 clear_bit(0, &fdc_busy);
922 /* switches the motor off after a given timeout */
923 static void motor_off_callback(struct timer_list *t)
925 unsigned long nr = t - motor_off_timer;
926 unsigned char mask = ~(0x10 << UNIT(nr));
928 if (WARN_ON_ONCE(nr >= N_DRIVE))
931 set_dor(FDC(nr), mask, 0);
934 /* schedules motor off */
935 static void floppy_off(unsigned int drive)
937 unsigned long volatile delta;
938 int fdc = FDC(drive);
940 if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))))
943 del_timer(motor_off_timer + drive);
945 /* make spindle stop in a position which minimizes spinup time
947 if (drive_params[drive].rps) {
948 delta = jiffies - drive_state[drive].first_read_date + HZ -
949 drive_params[drive].spindown_offset;
950 delta = ((delta * drive_params[drive].rps) % HZ) / drive_params[drive].rps;
951 motor_off_timer[drive].expires =
952 jiffies + drive_params[drive].spindown - delta;
954 add_timer(motor_off_timer + drive);
958 * cycle through all N_DRIVE floppy drives, for disk change testing.
959 * stopping at current drive. This is done before any long operation, to
960 * be sure to have up to date disk change information.
962 static void scandrives(void)
968 if (drive_params[current_drive].select_delay)
971 saved_drive = current_drive;
972 for (i = 0; i < N_DRIVE; i++) {
973 drive = (saved_drive + i + 1) % N_DRIVE;
974 if (drive_state[drive].fd_ref == 0 || drive_params[drive].select_delay != 0)
975 continue; /* skip closed drives */
977 if (!(set_dor(current_fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
978 (0x10 << UNIT(drive))))
979 /* switch the motor off again, if it was off to
981 set_dor(current_fdc, ~(0x10 << UNIT(drive)), 0);
983 set_fdc(saved_drive);
986 static void empty(void)
990 static void (*floppy_work_fn)(void);
992 static void floppy_work_workfn(struct work_struct *work)
997 static DECLARE_WORK(floppy_work, floppy_work_workfn);
999 static void schedule_bh(void (*handler)(void))
1001 WARN_ON(work_pending(&floppy_work));
1003 floppy_work_fn = handler;
1004 queue_work(floppy_wq, &floppy_work);
1007 static void (*fd_timer_fn)(void) = NULL;
1009 static void fd_timer_workfn(struct work_struct *work)
1014 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
1016 static void cancel_activity(void)
1019 cancel_delayed_work_sync(&fd_timer);
1020 cancel_work_sync(&floppy_work);
1023 /* this function makes sure that the disk stays in the drive during the
1025 static void fd_watchdog(void)
1027 debug_dcl(drive_params[current_drive].flags,
1028 "calling disk change from watchdog\n");
1030 if (disk_change(current_drive)) {
1031 DPRINT("disk removed during i/o\n");
1036 cancel_delayed_work(&fd_timer);
1037 fd_timer_fn = fd_watchdog;
1038 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
1042 static void main_command_interrupt(void)
1044 cancel_delayed_work(&fd_timer);
1048 /* waits for a delay (spinup or select) to pass */
1049 static int fd_wait_for_completion(unsigned long expires,
1050 void (*function)(void))
1052 if (fdc_state[current_fdc].reset) {
1053 reset_fdc(); /* do the reset during sleep to win time
1054 * if we don't need to sleep, it's a good
1055 * occasion anyways */
1059 if (time_before(jiffies, expires)) {
1060 cancel_delayed_work(&fd_timer);
1061 fd_timer_fn = function;
1062 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
1068 static void setup_DMA(void)
1072 if (raw_cmd->length == 0) {
1073 print_hex_dump(KERN_INFO, "zero dma transfer size: ",
1074 DUMP_PREFIX_NONE, 16, 1,
1075 raw_cmd->fullcmd, raw_cmd->cmd_count, false);
1077 fdc_state[current_fdc].reset = 1;
1080 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1081 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1083 fdc_state[current_fdc].reset = 1;
1086 f = claim_dma_lock();
1089 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1090 (raw_cmd->flags & FD_RAW_READ) ?
1091 DMA_MODE_READ : DMA_MODE_WRITE,
1092 fdc_state[current_fdc].address) < 0) {
1093 release_dma_lock(f);
1095 fdc_state[current_fdc].reset = 1;
1098 release_dma_lock(f);
1101 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1102 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1103 DMA_MODE_READ : DMA_MODE_WRITE);
1104 fd_set_dma_addr(raw_cmd->kernel_data);
1105 fd_set_dma_count(raw_cmd->length);
1106 virtual_dma_port = fdc_state[current_fdc].address;
1108 release_dma_lock(f);
1112 static void show_floppy(int fdc);
1114 /* waits until the fdc becomes ready */
1115 static int wait_til_ready(int fdc)
1120 if (fdc_state[fdc].reset)
1122 for (counter = 0; counter < 10000; counter++) {
1123 status = fdc_inb(fdc, FD_STATUS);
1124 if (status & STATUS_READY)
1128 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1131 fdc_state[fdc].reset = 1;
1135 /* sends a command byte to the fdc */
1136 static int output_byte(int fdc, char byte)
1138 int status = wait_til_ready(fdc);
1143 if (is_ready_state(status)) {
1144 fdc_outb(byte, fdc, FD_DATA);
1145 output_log[output_log_pos].data = byte;
1146 output_log[output_log_pos].status = status;
1147 output_log[output_log_pos].jiffies = jiffies;
1148 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1151 fdc_state[fdc].reset = 1;
1153 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1160 /* gets the response from the fdc */
1161 static int result(int fdc)
1166 for (i = 0; i < FD_RAW_REPLY_SIZE; i++) {
1167 status = wait_til_ready(fdc);
1170 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1171 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1172 resultjiffies = jiffies;
1176 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1177 reply_buffer[i] = fdc_inb(fdc, FD_DATA);
1182 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1186 fdc_state[fdc].reset = 1;
1190 #define MORE_OUTPUT -2
1191 /* does the fdc need more output? */
1192 static int need_more_output(int fdc)
1194 int status = wait_til_ready(fdc);
1199 if (is_ready_state(status))
1205 /* Set perpendicular mode as required, based on data rate, if supported.
1206 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1208 static void perpendicular_mode(int fdc)
1210 unsigned char perp_mode;
1212 if (raw_cmd->rate & 0x40) {
1213 switch (raw_cmd->rate & 3) {
1221 DPRINT("Invalid data rate for perpendicular mode!\n");
1223 fdc_state[fdc].reset = 1;
1225 * convenient way to return to
1226 * redo without too much hassle
1227 * (deep stack et al.)
1234 if (fdc_state[fdc].perp_mode == perp_mode)
1236 if (fdc_state[fdc].version >= FDC_82077_ORIG) {
1237 output_byte(fdc, FD_PERPENDICULAR);
1238 output_byte(fdc, perp_mode);
1239 fdc_state[fdc].perp_mode = perp_mode;
1240 } else if (perp_mode) {
1241 DPRINT("perpendicular mode not supported by this FDC.\n");
1243 } /* perpendicular_mode */
1245 static int fifo_depth = 0xa;
1248 static int fdc_configure(int fdc)
1251 output_byte(fdc, FD_CONFIGURE);
1252 if (need_more_output(fdc) != MORE_OUTPUT)
1254 output_byte(fdc, 0);
1255 output_byte(fdc, 0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1256 output_byte(fdc, 0); /* pre-compensation from track 0 upwards */
1260 #define NOMINAL_DTR 500
1262 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1263 * head load time, and DMA disable flag to values needed by floppy.
1265 * The value "dtr" is the data transfer rate in Kbps. It is needed
1266 * to account for the data rate-based scaling done by the 82072 and 82077
1267 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1270 * Note that changing the data transfer rate has a (probably deleterious)
1271 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1272 * fdc_specify is called again after each data transfer rate
1275 * srt: 1000 to 16000 in microseconds
1276 * hut: 16 to 240 milliseconds
1277 * hlt: 2 to 254 milliseconds
1279 * These values are rounded up to the next highest available delay time.
1281 static void fdc_specify(int fdc, int drive)
1283 unsigned char spec1;
1284 unsigned char spec2;
1288 unsigned long dtr = NOMINAL_DTR;
1289 unsigned long scale_dtr = NOMINAL_DTR;
1290 int hlt_max_code = 0x7f;
1291 int hut_max_code = 0xf;
1293 if (fdc_state[fdc].need_configure &&
1294 fdc_state[fdc].version >= FDC_82072A) {
1296 fdc_state[fdc].need_configure = 0;
1299 switch (raw_cmd->rate & 0x03) {
1305 if (fdc_state[fdc].version >= FDC_82078) {
1306 /* chose the default rate table, not the one
1307 * where 1 = 2 Mbps */
1308 output_byte(fdc, FD_DRIVESPEC);
1309 if (need_more_output(fdc) == MORE_OUTPUT) {
1310 output_byte(fdc, UNIT(drive));
1311 output_byte(fdc, 0xc0);
1320 if (fdc_state[fdc].version >= FDC_82072) {
1322 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1323 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1326 /* Convert step rate from microseconds to milliseconds and 4 bits */
1327 srt = 16 - DIV_ROUND_UP(drive_params[drive].srt * scale_dtr / 1000,
1335 hlt = DIV_ROUND_UP(drive_params[drive].hlt * scale_dtr / 2,
1339 else if (hlt > 0x7f)
1342 hut = DIV_ROUND_UP(drive_params[drive].hut * scale_dtr / 16,
1349 spec1 = (srt << 4) | hut;
1350 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1352 /* If these parameters did not change, just return with success */
1353 if (fdc_state[fdc].spec1 != spec1 ||
1354 fdc_state[fdc].spec2 != spec2) {
1355 /* Go ahead and set spec1 and spec2 */
1356 output_byte(fdc, FD_SPECIFY);
1357 output_byte(fdc, fdc_state[fdc].spec1 = spec1);
1358 output_byte(fdc, fdc_state[fdc].spec2 = spec2);
1362 /* Set the FDC's data transfer rate on behalf of the specified drive.
1363 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1364 * of the specify command (i.e. using the fdc_specify function).
1366 static int fdc_dtr(void)
1368 /* If data rate not already set to desired value, set it. */
1369 if ((raw_cmd->rate & 3) == fdc_state[current_fdc].dtr)
1373 fdc_outb(raw_cmd->rate & 3, current_fdc, FD_DCR);
1375 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1376 * need a stabilization period of several milliseconds to be
1377 * enforced after data rate changes before R/W operations.
1378 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1380 fdc_state[current_fdc].dtr = raw_cmd->rate & 3;
1381 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready);
1384 static void tell_sector(void)
1386 pr_cont(": track %d, head %d, sector %d, size %d",
1387 reply_buffer[R_TRACK], reply_buffer[R_HEAD],
1388 reply_buffer[R_SECTOR],
1389 reply_buffer[R_SIZECODE]);
1392 static void print_errors(void)
1395 if (reply_buffer[ST0] & ST0_ECE) {
1396 pr_cont("Recalibrate failed!");
1397 } else if (reply_buffer[ST2] & ST2_CRC) {
1398 pr_cont("data CRC error");
1400 } else if (reply_buffer[ST1] & ST1_CRC) {
1401 pr_cont("CRC error");
1403 } else if ((reply_buffer[ST1] & (ST1_MAM | ST1_ND)) ||
1404 (reply_buffer[ST2] & ST2_MAM)) {
1406 pr_cont("sector not found");
1409 pr_cont("probe failed...");
1410 } else if (reply_buffer[ST2] & ST2_WC) { /* seek error */
1411 pr_cont("wrong cylinder");
1412 } else if (reply_buffer[ST2] & ST2_BC) { /* cylinder marked as bad */
1413 pr_cont("bad cylinder");
1415 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1416 reply_buffer[ST0], reply_buffer[ST1],
1424 * OK, this error interpreting routine is called after a
1425 * DMA read/write has succeeded
1426 * or failed, so we check the results, and copy any buffers.
1427 * hhb: Added better error reporting.
1428 * ak: Made this into a separate routine.
1430 static int interpret_errors(void)
1435 DPRINT("-- FDC reply error\n");
1436 fdc_state[current_fdc].reset = 1;
1440 /* check IC to find cause of interrupt */
1441 switch (reply_buffer[ST0] & ST0_INTR) {
1442 case 0x40: /* error occurred during command execution */
1443 if (reply_buffer[ST1] & ST1_EOC)
1444 return 0; /* occurs with pseudo-DMA */
1446 if (reply_buffer[ST1] & ST1_WP) {
1447 DPRINT("Drive is write protected\n");
1448 clear_bit(FD_DISK_WRITABLE_BIT,
1449 &drive_state[current_drive].flags);
1452 } else if (reply_buffer[ST1] & ST1_ND) {
1453 set_bit(FD_NEED_TWADDLE_BIT,
1454 &drive_state[current_drive].flags);
1455 } else if (reply_buffer[ST1] & ST1_OR) {
1456 if (drive_params[current_drive].flags & FTD_MSG)
1457 DPRINT("Over/Underrun - retrying\n");
1459 } else if (*errors >= drive_params[current_drive].max_errors.reporting) {
1462 if (reply_buffer[ST2] & ST2_WC || reply_buffer[ST2] & ST2_BC)
1463 /* wrong cylinder => recal */
1464 drive_state[current_drive].track = NEED_2_RECAL;
1466 case 0x80: /* invalid command given */
1467 DPRINT("Invalid FDC command given!\n");
1471 DPRINT("Abnormal termination caused by polling\n");
1474 default: /* (0) Normal command termination */
1480 * This routine is called when everything should be correctly set up
1481 * for the transfer (i.e. floppy motor is on, the correct floppy is
1482 * selected, and the head is sitting on the right track).
1484 static void setup_rw_floppy(void)
1489 unsigned long ready_date;
1490 void (*function)(void);
1492 flags = raw_cmd->flags;
1493 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1494 flags |= FD_RAW_INTR;
1496 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1497 ready_date = drive_state[current_drive].spinup_date + drive_params[current_drive].spinup;
1498 /* If spinup will take a long time, rerun scandrives
1499 * again just before spinup completion. Beware that
1500 * after scandrives, we must again wait for selection.
1502 if (time_after(ready_date, jiffies + drive_params[current_drive].select_delay)) {
1503 ready_date -= drive_params[current_drive].select_delay;
1504 function = floppy_start;
1506 function = setup_rw_floppy;
1508 /* wait until the floppy is spinning fast enough */
1509 if (fd_wait_for_completion(ready_date, function))
1512 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1515 if (flags & FD_RAW_INTR)
1516 do_floppy = main_command_interrupt;
1519 for (i = 0; i < raw_cmd->cmd_count; i++)
1520 r |= output_byte(current_fdc, raw_cmd->fullcmd[i]);
1522 debugt(__func__, "rw_command");
1530 if (!(flags & FD_RAW_INTR)) {
1531 inr = result(current_fdc);
1533 } else if (flags & FD_RAW_NEED_DISK)
1537 static int blind_seek;
1540 * This is the routine called after every seek (or recalibrate) interrupt
1541 * from the floppy controller.
1543 static void seek_interrupt(void)
1545 debugt(__func__, "");
1546 if (inr != 2 || (reply_buffer[ST0] & 0xF8) != 0x20) {
1547 DPRINT("seek failed\n");
1548 drive_state[current_drive].track = NEED_2_RECAL;
1553 if (drive_state[current_drive].track >= 0 &&
1554 drive_state[current_drive].track != reply_buffer[ST1] &&
1556 debug_dcl(drive_params[current_drive].flags,
1557 "clearing NEWCHANGE flag because of effective seek\n");
1558 debug_dcl(drive_params[current_drive].flags, "jiffies=%lu\n",
1560 clear_bit(FD_DISK_NEWCHANGE_BIT,
1561 &drive_state[current_drive].flags);
1562 /* effective seek */
1563 drive_state[current_drive].select_date = jiffies;
1565 drive_state[current_drive].track = reply_buffer[ST1];
1569 static void check_wp(int fdc, int drive)
1571 if (test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) {
1572 /* check write protection */
1573 output_byte(fdc, FD_GETSTATUS);
1574 output_byte(fdc, UNIT(drive));
1575 if (result(fdc) != 1) {
1576 fdc_state[fdc].reset = 1;
1579 clear_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
1580 clear_bit(FD_NEED_TWADDLE_BIT,
1581 &drive_state[drive].flags);
1582 debug_dcl(drive_params[drive].flags,
1583 "checking whether disk is write protected\n");
1584 debug_dcl(drive_params[drive].flags, "wp=%x\n",
1585 reply_buffer[ST3] & 0x40);
1586 if (!(reply_buffer[ST3] & 0x40))
1587 set_bit(FD_DISK_WRITABLE_BIT,
1588 &drive_state[drive].flags);
1590 clear_bit(FD_DISK_WRITABLE_BIT,
1591 &drive_state[drive].flags);
1595 static void seek_floppy(void)
1601 debug_dcl(drive_params[current_drive].flags,
1602 "calling disk change from %s\n", __func__);
1604 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) &&
1605 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1606 /* the media changed flag should be cleared after the seek.
1607 * If it isn't, this means that there is really no disk in
1610 set_bit(FD_DISK_CHANGED_BIT,
1611 &drive_state[current_drive].flags);
1616 if (drive_state[current_drive].track <= NEED_1_RECAL) {
1617 recalibrate_floppy();
1619 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) &&
1620 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1621 (drive_state[current_drive].track <= NO_TRACK || drive_state[current_drive].track == raw_cmd->track)) {
1622 /* we seek to clear the media-changed condition. Does anybody
1623 * know a more elegant way, which works on all drives? */
1625 track = raw_cmd->track - 1;
1627 if (drive_params[current_drive].flags & FD_SILENT_DCL_CLEAR) {
1628 set_dor(current_fdc, ~(0x10 << UNIT(current_drive)), 0);
1630 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1635 check_wp(current_fdc, current_drive);
1636 if (raw_cmd->track != drive_state[current_drive].track &&
1637 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1638 track = raw_cmd->track;
1645 do_floppy = seek_interrupt;
1646 output_byte(current_fdc, FD_SEEK);
1647 output_byte(current_fdc, UNIT(current_drive));
1648 if (output_byte(current_fdc, track) < 0) {
1652 debugt(__func__, "");
1655 static void recal_interrupt(void)
1657 debugt(__func__, "");
1659 fdc_state[current_fdc].reset = 1;
1660 else if (reply_buffer[ST0] & ST0_ECE) {
1661 switch (drive_state[current_drive].track) {
1663 debugt(__func__, "need 1 recal");
1664 /* after a second recalibrate, we still haven't
1665 * reached track 0. Probably no drive. Raise an
1666 * error, as failing immediately might upset
1667 * computers possessed by the Devil :-) */
1672 debugt(__func__, "need 2 recal");
1673 /* If we already did a recalibrate,
1674 * and we are not at track 0, this
1675 * means we have moved. (The only way
1676 * not to move at recalibration is to
1677 * be already at track 0.) Clear the
1678 * new change flag */
1679 debug_dcl(drive_params[current_drive].flags,
1680 "clearing NEWCHANGE flag because of second recalibrate\n");
1682 clear_bit(FD_DISK_NEWCHANGE_BIT,
1683 &drive_state[current_drive].flags);
1684 drive_state[current_drive].select_date = jiffies;
1687 debugt(__func__, "default");
1688 /* Recalibrate moves the head by at
1689 * most 80 steps. If after one
1690 * recalibrate we don't have reached
1691 * track 0, this might mean that we
1692 * started beyond track 80. Try
1694 drive_state[current_drive].track = NEED_1_RECAL;
1698 drive_state[current_drive].track = reply_buffer[ST1];
1702 static void print_result(char *message, int inr)
1706 DPRINT("%s ", message);
1708 for (i = 0; i < inr; i++)
1709 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1713 /* interrupt handler. Note that this can be called externally on the Sparc */
1714 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1718 void (*handler)(void) = do_floppy;
1720 lasthandler = handler;
1721 interruptjiffies = jiffies;
1723 f = claim_dma_lock();
1725 release_dma_lock(f);
1728 if (current_fdc >= N_FDC || fdc_state[current_fdc].address == -1) {
1729 /* we don't even know which FDC is the culprit */
1730 pr_info("DOR0=%x\n", fdc_state[0].dor);
1731 pr_info("floppy interrupt on bizarre fdc %d\n", current_fdc);
1732 pr_info("handler=%ps\n", handler);
1733 is_alive(__func__, "bizarre fdc");
1737 fdc_state[current_fdc].reset = 0;
1738 /* We have to clear the reset flag here, because apparently on boxes
1739 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1740 * emit SENSEI's to clear the interrupt line. And fdc_state[fdc].reset
1741 * blocks the emission of the SENSEI's.
1742 * It is OK to emit floppy commands because we are in an interrupt
1743 * handler here, and thus we have to fear no interference of other
1747 do_print = !handler && print_unex && initialized;
1749 inr = result(current_fdc);
1751 print_result("unexpected interrupt", inr);
1755 output_byte(current_fdc, FD_SENSEI);
1756 inr = result(current_fdc);
1758 print_result("sensei", inr);
1760 } while ((reply_buffer[ST0] & 0x83) != UNIT(current_drive) &&
1761 inr == 2 && max_sensei);
1764 fdc_state[current_fdc].reset = 1;
1767 schedule_bh(handler);
1768 is_alive(__func__, "normal interrupt end");
1770 /* FIXME! Was it really for us? */
1774 static void recalibrate_floppy(void)
1776 debugt(__func__, "");
1777 do_floppy = recal_interrupt;
1778 output_byte(current_fdc, FD_RECALIBRATE);
1779 if (output_byte(current_fdc, UNIT(current_drive)) < 0)
1784 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1786 static void reset_interrupt(void)
1788 debugt(__func__, "");
1789 result(current_fdc); /* get the status ready for set_fdc */
1790 if (fdc_state[current_fdc].reset) {
1791 pr_info("reset set in interrupt, calling %ps\n", cont->error);
1792 cont->error(); /* a reset just after a reset. BAD! */
1798 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1799 * or by setting the self clearing bit 7 of STATUS (newer FDCs).
1800 * This WILL trigger an interrupt, causing the handlers in the current
1801 * cont's ->redo() to be called via reset_interrupt().
1803 static void reset_fdc(void)
1805 unsigned long flags;
1807 do_floppy = reset_interrupt;
1808 fdc_state[current_fdc].reset = 0;
1809 reset_fdc_info(current_fdc, 0);
1811 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1812 /* Irrelevant for systems with true DMA (i386). */
1814 flags = claim_dma_lock();
1816 release_dma_lock(flags);
1818 if (fdc_state[current_fdc].version >= FDC_82072A)
1819 fdc_outb(0x80 | (fdc_state[current_fdc].dtr & 3),
1820 current_fdc, FD_STATUS);
1822 fdc_outb(fdc_state[current_fdc].dor & ~0x04, current_fdc, FD_DOR);
1823 udelay(FD_RESET_DELAY);
1824 fdc_outb(fdc_state[current_fdc].dor, current_fdc, FD_DOR);
1828 static void show_floppy(int fdc)
1833 pr_info("floppy driver state\n");
1834 pr_info("-------------------\n");
1835 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%ps\n",
1836 jiffies, interruptjiffies, jiffies - interruptjiffies,
1839 pr_info("timeout_message=%s\n", timeout_message);
1840 pr_info("last output bytes:\n");
1841 for (i = 0; i < OLOGSIZE; i++)
1842 pr_info("%2x %2x %lu\n",
1843 output_log[(i + output_log_pos) % OLOGSIZE].data,
1844 output_log[(i + output_log_pos) % OLOGSIZE].status,
1845 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1846 pr_info("last result at %lu\n", resultjiffies);
1847 pr_info("last redo_fd_request at %lu\n", lastredo);
1848 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1849 reply_buffer, resultsize, true);
1851 pr_info("status=%x\n", fdc_inb(fdc, FD_STATUS));
1852 pr_info("fdc_busy=%lu\n", fdc_busy);
1854 pr_info("do_floppy=%ps\n", do_floppy);
1855 if (work_pending(&floppy_work))
1856 pr_info("floppy_work.func=%ps\n", floppy_work.func);
1857 if (delayed_work_pending(&fd_timer))
1858 pr_info("delayed work.function=%p expires=%ld\n",
1860 fd_timer.timer.expires - jiffies);
1861 if (delayed_work_pending(&fd_timeout))
1862 pr_info("timer_function=%p expires=%ld\n",
1863 fd_timeout.work.func,
1864 fd_timeout.timer.expires - jiffies);
1866 pr_info("cont=%p\n", cont);
1867 pr_info("current_req=%p\n", current_req);
1868 pr_info("command_status=%d\n", command_status);
1872 static void floppy_shutdown(struct work_struct *arg)
1874 unsigned long flags;
1877 show_floppy(current_fdc);
1880 flags = claim_dma_lock();
1882 release_dma_lock(flags);
1884 /* avoid dma going to a random drive after shutdown */
1887 DPRINT("floppy timeout called\n");
1888 fdc_state[current_fdc].reset = 1;
1891 cont->redo(); /* this will recall reset when needed */
1893 pr_info("no cont in shutdown!\n");
1894 process_fd_request();
1896 is_alive(__func__, "");
1899 /* start motor, check media-changed condition and write protection */
1900 static int start_motor(void (*function)(void))
1906 data = UNIT(current_drive);
1907 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1908 if (!(fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))) {
1910 /* no read since this drive is running */
1911 drive_state[current_drive].first_read_date = 0;
1912 /* note motor start time if motor is not yet running */
1913 drive_state[current_drive].spinup_date = jiffies;
1914 data |= (0x10 << UNIT(current_drive));
1916 } else if (fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))
1917 mask &= ~(0x10 << UNIT(current_drive));
1919 /* starts motor and selects floppy */
1920 del_timer(motor_off_timer + current_drive);
1921 set_dor(current_fdc, mask, data);
1923 /* wait_for_completion also schedules reset if needed. */
1924 return fd_wait_for_completion(drive_state[current_drive].select_date + drive_params[current_drive].select_delay,
1928 static void floppy_ready(void)
1930 if (fdc_state[current_fdc].reset) {
1934 if (start_motor(floppy_ready))
1939 debug_dcl(drive_params[current_drive].flags,
1940 "calling disk change from floppy_ready\n");
1941 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1942 disk_change(current_drive) && !drive_params[current_drive].select_delay)
1943 twaddle(current_fdc, current_drive); /* this clears the dcl on certain
1944 * drive/controller combinations */
1946 #ifdef fd_chose_dma_mode
1947 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1948 unsigned long flags = claim_dma_lock();
1949 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1950 release_dma_lock(flags);
1954 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1955 perpendicular_mode(current_fdc);
1956 fdc_specify(current_fdc, current_drive); /* must be done here because of hut, hlt ... */
1959 if ((raw_cmd->flags & FD_RAW_READ) ||
1960 (raw_cmd->flags & FD_RAW_WRITE))
1961 fdc_specify(current_fdc, current_drive);
1966 static void floppy_start(void)
1968 reschedule_timeout(current_drive, "floppy start");
1971 debug_dcl(drive_params[current_drive].flags,
1972 "setting NEWCHANGE in floppy_start\n");
1973 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags);
1978 * ========================================================================
1979 * here ends the bottom half. Exported routines are:
1980 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1981 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1982 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1984 * ========================================================================
1987 * General purpose continuations.
1988 * ==============================
1991 static void do_wakeup(void)
1993 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1995 command_status += 2;
1996 wake_up(&command_done);
1999 static const struct cont_t wakeup_cont = {
2003 .done = (done_f)empty
2006 static const struct cont_t intr_cont = {
2008 .redo = process_fd_request,
2010 .done = (done_f)empty
2013 /* schedules handler, waiting for completion. May be interrupted, will then
2014 * return -EINTR, in which case the driver will automatically be unlocked.
2016 static int wait_til_done(void (*handler)(void), bool interruptible)
2020 schedule_bh(handler);
2023 wait_event_interruptible(command_done, command_status >= 2);
2025 wait_event(command_done, command_status >= 2);
2027 if (command_status < 2) {
2034 if (fdc_state[current_fdc].reset)
2035 command_status = FD_COMMAND_ERROR;
2036 if (command_status == FD_COMMAND_OKAY)
2040 command_status = FD_COMMAND_NONE;
2044 static void generic_done(int result)
2046 command_status = result;
2047 cont = &wakeup_cont;
2050 static void generic_success(void)
2055 static void generic_failure(void)
2060 static void success_and_wakeup(void)
2067 * formatting and rw support.
2068 * ==========================
2071 static int next_valid_format(int drive)
2075 probed_format = drive_state[drive].probed_format;
2077 if (probed_format >= FD_AUTODETECT_SIZE ||
2078 !drive_params[drive].autodetect[probed_format]) {
2079 drive_state[drive].probed_format = 0;
2082 if (floppy_type[drive_params[drive].autodetect[probed_format]].sect) {
2083 drive_state[drive].probed_format = probed_format;
2090 static void bad_flp_intr(void)
2095 drive_state[current_drive].probed_format++;
2096 if (!next_valid_format(current_drive))
2099 err_count = ++(*errors);
2100 INFBOUND(write_errors[current_drive].badness, err_count);
2101 if (err_count > drive_params[current_drive].max_errors.abort)
2103 if (err_count > drive_params[current_drive].max_errors.reset)
2104 fdc_state[current_fdc].reset = 1;
2105 else if (err_count > drive_params[current_drive].max_errors.recal)
2106 drive_state[current_drive].track = NEED_2_RECAL;
2109 static void set_floppy(int drive)
2111 int type = ITYPE(drive_state[drive].fd_device);
2114 _floppy = floppy_type + type;
2116 _floppy = current_type[drive];
2120 * formatting support.
2121 * ===================
2123 static void format_interrupt(void)
2125 switch (interpret_errors()) {
2136 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2137 #define CT(x) ((x) | 0xc0)
2139 static void setup_format_params(int track)
2147 unsigned char track, head, sect, size;
2148 } *here = (struct fparm *)floppy_track_buffer;
2150 raw_cmd = &default_raw_cmd;
2151 raw_cmd->track = track;
2153 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2154 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2155 raw_cmd->rate = _floppy->rate & 0x43;
2156 raw_cmd->cmd_count = NR_F;
2157 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_FORMAT);
2158 raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2159 raw_cmd->cmd[F_SIZECODE] = FD_SIZECODE(_floppy);
2160 raw_cmd->cmd[F_SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[F_SIZECODE];
2161 raw_cmd->cmd[F_GAP] = _floppy->fmt_gap;
2162 raw_cmd->cmd[F_FILL] = FD_FILL_BYTE;
2164 raw_cmd->kernel_data = floppy_track_buffer;
2165 raw_cmd->length = 4 * raw_cmd->cmd[F_SECT_PER_TRACK];
2167 if (!raw_cmd->cmd[F_SECT_PER_TRACK])
2170 /* allow for about 30ms for data transport per track */
2171 head_shift = (raw_cmd->cmd[F_SECT_PER_TRACK] + 5) / 6;
2173 /* a ``cylinder'' is two tracks plus a little stepping time */
2174 track_shift = 2 * head_shift + 3;
2176 /* position of logical sector 1 on this track */
2177 n = (track_shift * format_req.track + head_shift * format_req.head)
2178 % raw_cmd->cmd[F_SECT_PER_TRACK];
2180 /* determine interleave */
2182 if (_floppy->fmt_gap < 0x22)
2185 /* initialize field */
2186 for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) {
2187 here[count].track = format_req.track;
2188 here[count].head = format_req.head;
2189 here[count].sect = 0;
2190 here[count].size = raw_cmd->cmd[F_SIZECODE];
2192 /* place logical sectors */
2193 for (count = 1; count <= raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) {
2194 here[n].sect = count;
2195 n = (n + il) % raw_cmd->cmd[F_SECT_PER_TRACK];
2196 if (here[n].sect) { /* sector busy, find next free sector */
2198 if (n >= raw_cmd->cmd[F_SECT_PER_TRACK]) {
2199 n -= raw_cmd->cmd[F_SECT_PER_TRACK];
2200 while (here[n].sect)
2205 if (_floppy->stretch & FD_SECTBASEMASK) {
2206 for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; count++)
2207 here[count].sect += FD_SECTBASE(_floppy) - 1;
2211 static void redo_format(void)
2214 setup_format_params(format_req.track << STRETCH(_floppy));
2216 debugt(__func__, "queue format request");
2219 static const struct cont_t format_cont = {
2220 .interrupt = format_interrupt,
2221 .redo = redo_format,
2222 .error = bad_flp_intr,
2223 .done = generic_done
2226 static int do_format(int drive, struct format_descr *tmp_format_req)
2230 if (lock_fdc(drive))
2235 _floppy->track > drive_params[current_drive].tracks ||
2236 tmp_format_req->track >= _floppy->track ||
2237 tmp_format_req->head >= _floppy->head ||
2238 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2239 !_floppy->fmt_gap) {
2240 process_fd_request();
2243 format_req = *tmp_format_req;
2245 cont = &format_cont;
2246 errors = &format_errors;
2247 ret = wait_til_done(redo_format, true);
2250 process_fd_request();
2255 * Buffer read/write and support
2256 * =============================
2259 static void floppy_end_request(struct request *req, blk_status_t error)
2261 unsigned int nr_sectors = current_count_sectors;
2262 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2264 /* current_count_sectors can be zero if transfer failed */
2266 nr_sectors = blk_rq_cur_sectors(req);
2267 if (blk_update_request(req, error, nr_sectors << 9))
2269 __blk_mq_end_request(req, error);
2271 /* We're done with the request */
2276 /* new request_done. Can handle physical sectors which are smaller than a
2278 static void request_done(int uptodate)
2280 struct request *req = current_req;
2282 char msg[sizeof("request done ") + sizeof(int) * 3];
2285 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2286 reschedule_timeout(MAXTIMEOUT, msg);
2289 pr_info("floppy.c: no request in request_done\n");
2294 /* maintain values for invalidation on geometry
2296 block = current_count_sectors + blk_rq_pos(req);
2297 INFBOUND(drive_state[current_drive].maxblock, block);
2298 if (block > _floppy->sect)
2299 drive_state[current_drive].maxtrack = 1;
2301 floppy_end_request(req, 0);
2303 if (rq_data_dir(req) == WRITE) {
2304 /* record write error information */
2305 write_errors[current_drive].write_errors++;
2306 if (write_errors[current_drive].write_errors == 1) {
2307 write_errors[current_drive].first_error_sector = blk_rq_pos(req);
2308 write_errors[current_drive].first_error_generation = drive_state[current_drive].generation;
2310 write_errors[current_drive].last_error_sector = blk_rq_pos(req);
2311 write_errors[current_drive].last_error_generation = drive_state[current_drive].generation;
2313 floppy_end_request(req, BLK_STS_IOERR);
2317 /* Interrupt handler evaluating the result of the r/w operation */
2318 static void rw_interrupt(void)
2325 if (reply_buffer[R_HEAD] >= 2) {
2326 /* some Toshiba floppy controllers occasionnally seem to
2327 * return bogus interrupts after read/write operations, which
2328 * can be recognized by a bad head number (>= 2) */
2332 if (!drive_state[current_drive].first_read_date)
2333 drive_state[current_drive].first_read_date = jiffies;
2336 ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4);
2338 if (reply_buffer[ST1] & ST1_EOC)
2343 if (raw_cmd->cmd[COMMAND] & 0x80)
2348 nr_sectors = (((reply_buffer[R_TRACK] - raw_cmd->cmd[TRACK]) * heads +
2349 reply_buffer[R_HEAD] - raw_cmd->cmd[HEAD]) * raw_cmd->cmd[SECT_PER_TRACK] +
2350 reply_buffer[R_SECTOR] - raw_cmd->cmd[SECTOR] + eoc) << raw_cmd->cmd[SIZECODE] >> 2;
2352 if (nr_sectors / ssize >
2353 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2354 DPRINT("long rw: %x instead of %lx\n",
2355 nr_sectors, current_count_sectors);
2356 pr_info("rs=%d s=%d\n", reply_buffer[R_SECTOR],
2357 raw_cmd->cmd[SECTOR]);
2358 pr_info("rh=%d h=%d\n", reply_buffer[R_HEAD],
2359 raw_cmd->cmd[HEAD]);
2360 pr_info("rt=%d t=%d\n", reply_buffer[R_TRACK],
2361 raw_cmd->cmd[TRACK]);
2362 pr_info("heads=%d eoc=%d\n", heads, eoc);
2363 pr_info("spt=%d st=%d ss=%d\n",
2364 raw_cmd->cmd[SECT_PER_TRACK], fsector_t, ssize);
2365 pr_info("in_sector_offset=%d\n", in_sector_offset);
2368 nr_sectors -= in_sector_offset;
2369 INFBOUND(nr_sectors, 0);
2370 SUPBOUND(current_count_sectors, nr_sectors);
2372 switch (interpret_errors()) {
2377 if (!current_count_sectors) {
2384 if (!current_count_sectors) {
2388 current_type[current_drive] = _floppy;
2389 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2394 if (drive_params[current_drive].flags & FTD_MSG)
2395 DPRINT("Auto-detected floppy type %s in fd%d\n",
2396 _floppy->name, current_drive);
2397 current_type[current_drive] = _floppy;
2398 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2402 if (CT(raw_cmd->cmd[COMMAND]) != FD_READ ||
2403 raw_cmd->kernel_data == bio_data(current_req->bio)) {
2404 /* transfer directly from buffer */
2406 } else if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) {
2407 buffer_track = raw_cmd->track;
2408 buffer_drive = current_drive;
2409 INFBOUND(buffer_max, nr_sectors + fsector_t);
2414 /* Compute maximal contiguous buffer size. */
2415 static int buffer_chain_size(void)
2419 struct req_iterator iter;
2422 base = bio_data(current_req->bio);
2425 rq_for_each_segment(bv, current_req, iter) {
2426 if (page_address(bv.bv_page) + bv.bv_offset != base + size)
2435 /* Compute the maximal transfer size */
2436 static int transfer_size(int ssize, int max_sector, int max_size)
2438 SUPBOUND(max_sector, fsector_t + max_size);
2441 max_sector -= (max_sector % _floppy->sect) % ssize;
2443 /* transfer size, beginning not aligned */
2444 current_count_sectors = max_sector - fsector_t;
2450 * Move data from/to the track buffer to/from the buffer cache.
2452 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2454 int remaining; /* number of transferred 512-byte sectors */
2459 struct req_iterator iter;
2461 max_sector = transfer_size(ssize,
2462 min(max_sector, max_sector_2),
2463 blk_rq_sectors(current_req));
2465 if (current_count_sectors <= 0 && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE &&
2466 buffer_max > fsector_t + blk_rq_sectors(current_req))
2467 current_count_sectors = min_t(int, buffer_max - fsector_t,
2468 blk_rq_sectors(current_req));
2470 remaining = current_count_sectors << 9;
2471 if (remaining > blk_rq_bytes(current_req) && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2472 DPRINT("in copy buffer\n");
2473 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2474 pr_info("remaining=%d\n", remaining >> 9);
2475 pr_info("current_req->nr_sectors=%u\n",
2476 blk_rq_sectors(current_req));
2477 pr_info("current_req->current_nr_sectors=%u\n",
2478 blk_rq_cur_sectors(current_req));
2479 pr_info("max_sector=%d\n", max_sector);
2480 pr_info("ssize=%d\n", ssize);
2483 buffer_max = max(max_sector, buffer_max);
2485 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2487 size = blk_rq_cur_bytes(current_req);
2489 rq_for_each_segment(bv, current_req, iter) {
2494 SUPBOUND(size, remaining);
2496 buffer = page_address(bv.bv_page) + bv.bv_offset;
2497 if (dma_buffer + size >
2498 floppy_track_buffer + (max_buffer_sectors << 10) ||
2499 dma_buffer < floppy_track_buffer) {
2500 DPRINT("buffer overrun in copy buffer %d\n",
2501 (int)((floppy_track_buffer - dma_buffer) >> 9));
2502 pr_info("fsector_t=%d buffer_min=%d\n",
2503 fsector_t, buffer_min);
2504 pr_info("current_count_sectors=%ld\n",
2505 current_count_sectors);
2506 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
2508 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE)
2512 if (((unsigned long)buffer) % 512)
2513 DPRINT("%p buffer not aligned\n", buffer);
2515 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
2516 memcpy(buffer, dma_buffer, size);
2518 memcpy(dma_buffer, buffer, size);
2525 max_sector -= remaining >> 9;
2526 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2530 /* work around a bug in pseudo DMA
2531 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2532 * sending data. Hence we need a different way to signal the
2533 * transfer length: We use raw_cmd->cmd[SECT_PER_TRACK]. Unfortunately, this
2534 * does not work with MT, hence we can only transfer one head at
2537 static void virtualdmabug_workaround(void)
2542 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2543 raw_cmd->cmd[COMMAND] &= ~0x80; /* switch off multiple track mode */
2545 hard_sectors = raw_cmd->length >> (7 + raw_cmd->cmd[SIZECODE]);
2546 end_sector = raw_cmd->cmd[SECTOR] + hard_sectors - 1;
2547 if (end_sector > raw_cmd->cmd[SECT_PER_TRACK]) {
2548 pr_info("too many sectors %d > %d\n",
2549 end_sector, raw_cmd->cmd[SECT_PER_TRACK]);
2552 raw_cmd->cmd[SECT_PER_TRACK] = end_sector;
2553 /* make sure raw_cmd->cmd[SECT_PER_TRACK]
2554 * points to end of transfer */
2559 * Formulate a read/write request.
2560 * this routine decides where to load the data (directly to buffer, or to
2561 * tmp floppy area), how much data to load (the size of the buffer, the whole
2562 * track, or a single sector)
2563 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2564 * allocation on the fly, it should be done here. No other part should need
2568 static int make_raw_rw_request(void)
2570 int aligned_sector_t;
2576 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2579 set_fdc((long)current_req->rq_disk->private_data);
2581 raw_cmd = &default_raw_cmd;
2582 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2583 raw_cmd->cmd_count = NR_RW;
2584 if (rq_data_dir(current_req) == READ) {
2585 raw_cmd->flags |= FD_RAW_READ;
2586 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ);
2587 } else if (rq_data_dir(current_req) == WRITE) {
2588 raw_cmd->flags |= FD_RAW_WRITE;
2589 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_WRITE);
2591 DPRINT("%s: unknown command\n", __func__);
2595 max_sector = _floppy->sect * _floppy->head;
2597 raw_cmd->cmd[TRACK] = (int)blk_rq_pos(current_req) / max_sector;
2598 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2599 if (_floppy->track && raw_cmd->cmd[TRACK] >= _floppy->track) {
2600 if (blk_rq_cur_sectors(current_req) & 1) {
2601 current_count_sectors = 1;
2606 raw_cmd->cmd[HEAD] = fsector_t / _floppy->sect;
2608 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2609 test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) &&
2610 fsector_t < _floppy->sect)
2611 max_sector = _floppy->sect;
2613 /* 2M disks have phantom sectors on the first track */
2614 if ((_floppy->rate & FD_2M) && (!raw_cmd->cmd[TRACK]) && (!raw_cmd->cmd[HEAD])) {
2615 max_sector = 2 * _floppy->sect / 3;
2616 if (fsector_t >= max_sector) {
2617 current_count_sectors =
2618 min_t(int, _floppy->sect - fsector_t,
2619 blk_rq_sectors(current_req));
2622 raw_cmd->cmd[SIZECODE] = 2;
2624 raw_cmd->cmd[SIZECODE] = FD_SIZECODE(_floppy);
2625 raw_cmd->rate = _floppy->rate & 0x43;
2626 if ((_floppy->rate & FD_2M) &&
2627 (raw_cmd->cmd[TRACK] || raw_cmd->cmd[HEAD]) && raw_cmd->rate == 2)
2630 if (raw_cmd->cmd[SIZECODE])
2631 raw_cmd->cmd[SIZECODE2] = 0xff;
2633 raw_cmd->cmd[SIZECODE2] = 0x80;
2634 raw_cmd->track = raw_cmd->cmd[TRACK] << STRETCH(_floppy);
2635 raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, raw_cmd->cmd[HEAD]);
2636 raw_cmd->cmd[GAP] = _floppy->gap;
2637 ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4);
2638 raw_cmd->cmd[SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[SIZECODE];
2639 raw_cmd->cmd[SECTOR] = ((fsector_t % _floppy->sect) << 2 >> raw_cmd->cmd[SIZECODE]) +
2640 FD_SECTBASE(_floppy);
2642 /* tracksize describes the size which can be filled up with sectors
2645 tracksize = _floppy->sect - _floppy->sect % ssize;
2646 if (tracksize < _floppy->sect) {
2647 raw_cmd->cmd[SECT_PER_TRACK]++;
2648 if (tracksize <= fsector_t % _floppy->sect)
2649 raw_cmd->cmd[SECTOR]--;
2651 /* if we are beyond tracksize, fill up using smaller sectors */
2652 while (tracksize <= fsector_t % _floppy->sect) {
2653 while (tracksize + ssize > _floppy->sect) {
2654 raw_cmd->cmd[SIZECODE]--;
2657 raw_cmd->cmd[SECTOR]++;
2658 raw_cmd->cmd[SECT_PER_TRACK]++;
2661 max_sector = raw_cmd->cmd[HEAD] * _floppy->sect + tracksize;
2662 } else if (!raw_cmd->cmd[TRACK] && !raw_cmd->cmd[HEAD] && !(_floppy->rate & FD_2M) && probing) {
2663 max_sector = _floppy->sect;
2664 } else if (!raw_cmd->cmd[HEAD] && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2665 /* for virtual DMA bug workaround */
2666 max_sector = _floppy->sect;
2669 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2670 aligned_sector_t = fsector_t - in_sector_offset;
2671 max_size = blk_rq_sectors(current_req);
2672 if ((raw_cmd->track == buffer_track) &&
2673 (current_drive == buffer_drive) &&
2674 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2675 /* data already in track buffer */
2676 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) {
2677 copy_buffer(1, max_sector, buffer_max);
2680 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2681 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2682 unsigned int sectors;
2684 sectors = fsector_t + blk_rq_sectors(current_req);
2685 if (sectors > ssize && sectors < ssize + ssize)
2686 max_size = ssize + ssize;
2690 raw_cmd->flags &= ~FD_RAW_WRITE;
2691 raw_cmd->flags |= FD_RAW_READ;
2692 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ);
2693 } else if ((unsigned long)bio_data(current_req->bio) < MAX_DMA_ADDRESS) {
2694 unsigned long dma_limit;
2695 int direct, indirect;
2698 transfer_size(ssize, max_sector,
2699 max_buffer_sectors * 2) - fsector_t;
2702 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2703 * on a 64 bit machine!
2705 max_size = buffer_chain_size();
2706 dma_limit = (MAX_DMA_ADDRESS -
2707 ((unsigned long)bio_data(current_req->bio))) >> 9;
2708 if ((unsigned long)max_size > dma_limit)
2709 max_size = dma_limit;
2710 /* 64 kb boundaries */
2711 if (CROSS_64KB(bio_data(current_req->bio), max_size << 9))
2713 ((unsigned long)bio_data(current_req->bio)) %
2715 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2717 * We try to read tracks, but if we get too many errors, we
2718 * go back to reading just one sector at a time.
2720 * This means we should be able to read a sector even if there
2721 * are other bad sectors on this track.
2724 (indirect * 2 > direct * 3 &&
2725 *errors < drive_params[current_drive].max_errors.read_track &&
2727 (drive_params[current_drive].read_track & (1 << drive_state[current_drive].probed_format)))))) {
2728 max_size = blk_rq_sectors(current_req);
2730 raw_cmd->kernel_data = bio_data(current_req->bio);
2731 raw_cmd->length = current_count_sectors << 9;
2732 if (raw_cmd->length == 0) {
2733 DPRINT("%s: zero dma transfer attempted\n", __func__);
2734 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2735 indirect, direct, fsector_t);
2738 virtualdmabug_workaround();
2743 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
2744 max_size = max_sector; /* unbounded */
2746 /* claim buffer track if needed */
2747 if (buffer_track != raw_cmd->track || /* bad track */
2748 buffer_drive != current_drive || /* bad drive */
2749 fsector_t > buffer_max ||
2750 fsector_t < buffer_min ||
2751 ((CT(raw_cmd->cmd[COMMAND]) == FD_READ ||
2752 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2753 max_sector > 2 * max_buffer_sectors + buffer_min &&
2754 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2755 /* not enough space */
2757 buffer_drive = current_drive;
2758 buffer_max = buffer_min = aligned_sector_t;
2760 raw_cmd->kernel_data = floppy_track_buffer +
2761 ((aligned_sector_t - buffer_min) << 9);
2763 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2764 /* copy write buffer to track buffer.
2765 * if we get here, we know that the write
2766 * is either aligned or the data already in the buffer
2767 * (buffer will be overwritten) */
2768 if (in_sector_offset && buffer_track == -1)
2769 DPRINT("internal error offset !=0 on write\n");
2770 buffer_track = raw_cmd->track;
2771 buffer_drive = current_drive;
2772 copy_buffer(ssize, max_sector,
2773 2 * max_buffer_sectors + buffer_min);
2775 transfer_size(ssize, max_sector,
2776 2 * max_buffer_sectors + buffer_min -
2779 /* round up current_count_sectors to get dma xfer size */
2780 raw_cmd->length = in_sector_offset + current_count_sectors;
2781 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2782 raw_cmd->length <<= 9;
2783 if ((raw_cmd->length < current_count_sectors << 9) ||
2784 (raw_cmd->kernel_data != bio_data(current_req->bio) &&
2785 CT(raw_cmd->cmd[COMMAND]) == FD_WRITE &&
2786 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2787 aligned_sector_t < buffer_min)) ||
2788 raw_cmd->length % (128 << raw_cmd->cmd[SIZECODE]) ||
2789 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2790 DPRINT("fractionary current count b=%lx s=%lx\n",
2791 raw_cmd->length, current_count_sectors);
2792 if (raw_cmd->kernel_data != bio_data(current_req->bio))
2793 pr_info("addr=%d, length=%ld\n",
2794 (int)((raw_cmd->kernel_data -
2795 floppy_track_buffer) >> 9),
2796 current_count_sectors);
2797 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2798 fsector_t, aligned_sector_t, max_sector, max_size);
2799 pr_info("ssize=%x SIZECODE=%d\n", ssize, raw_cmd->cmd[SIZECODE]);
2800 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2801 raw_cmd->cmd[COMMAND], raw_cmd->cmd[SECTOR],
2802 raw_cmd->cmd[HEAD], raw_cmd->cmd[TRACK]);
2803 pr_info("buffer drive=%d\n", buffer_drive);
2804 pr_info("buffer track=%d\n", buffer_track);
2805 pr_info("buffer_min=%d\n", buffer_min);
2806 pr_info("buffer_max=%d\n", buffer_max);
2810 if (raw_cmd->kernel_data != bio_data(current_req->bio)) {
2811 if (raw_cmd->kernel_data < floppy_track_buffer ||
2812 current_count_sectors < 0 ||
2813 raw_cmd->length < 0 ||
2814 raw_cmd->kernel_data + raw_cmd->length >
2815 floppy_track_buffer + (max_buffer_sectors << 10)) {
2816 DPRINT("buffer overrun in schedule dma\n");
2817 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2818 fsector_t, buffer_min, raw_cmd->length >> 9);
2819 pr_info("current_count_sectors=%ld\n",
2820 current_count_sectors);
2821 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
2823 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE)
2827 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2828 current_count_sectors > blk_rq_sectors(current_req)) {
2829 DPRINT("buffer overrun in direct transfer\n");
2831 } else if (raw_cmd->length < current_count_sectors << 9) {
2832 DPRINT("more sectors than bytes\n");
2833 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2834 pr_info("sectors=%ld\n", current_count_sectors);
2836 if (raw_cmd->length == 0) {
2837 DPRINT("zero dma transfer attempted from make_raw_request\n");
2841 virtualdmabug_workaround();
2845 static int set_next_request(void)
2847 current_req = list_first_entry_or_null(&floppy_reqs, struct request,
2850 current_req->error_count = 0;
2851 list_del_init(¤t_req->queuelist);
2853 return current_req != NULL;
2856 /* Starts or continues processing request. Will automatically unlock the
2857 * driver at end of request.
2859 static void redo_fd_request(void)
2865 if (current_drive < N_DRIVE)
2866 floppy_off(current_drive);
2872 spin_lock_irq(&floppy_lock);
2873 pending = set_next_request();
2874 spin_unlock_irq(&floppy_lock);
2881 drive = (long)current_req->rq_disk->private_data;
2883 reschedule_timeout(current_drive, "redo fd request");
2886 raw_cmd = &default_raw_cmd;
2888 if (start_motor(redo_fd_request))
2891 disk_change(current_drive);
2892 if (test_bit(current_drive, &fake_change) ||
2893 test_bit(FD_DISK_CHANGED_BIT, &drive_state[current_drive].flags)) {
2894 DPRINT("disk absent or changed during operation\n");
2898 if (!_floppy) { /* Autodetection */
2900 drive_state[current_drive].probed_format = 0;
2901 if (next_valid_format(current_drive)) {
2902 DPRINT("no autodetectable formats\n");
2909 _floppy = floppy_type + drive_params[current_drive].autodetect[drive_state[current_drive].probed_format];
2912 errors = &(current_req->error_count);
2913 tmp = make_raw_rw_request();
2919 if (test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags))
2920 twaddle(current_fdc, current_drive);
2921 schedule_bh(floppy_start);
2922 debugt(__func__, "queue fd request");
2926 static const struct cont_t rw_cont = {
2927 .interrupt = rw_interrupt,
2928 .redo = redo_fd_request,
2929 .error = bad_flp_intr,
2930 .done = request_done
2933 /* schedule the request and automatically unlock the driver on completion */
2934 static void process_fd_request(void)
2937 schedule_bh(redo_fd_request);
2940 static blk_status_t floppy_queue_rq(struct blk_mq_hw_ctx *hctx,
2941 const struct blk_mq_queue_data *bd)
2943 blk_mq_start_request(bd->rq);
2945 if (WARN(max_buffer_sectors == 0,
2946 "VFS: %s called on non-open device\n", __func__))
2947 return BLK_STS_IOERR;
2949 if (WARN(atomic_read(&usage_count) == 0,
2950 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n",
2951 current_req, (long)blk_rq_pos(current_req),
2952 (unsigned long long) current_req->cmd_flags))
2953 return BLK_STS_IOERR;
2955 if (test_and_set_bit(0, &fdc_busy)) {
2956 /* fdc busy, this new request will be treated when the
2957 current one is done */
2958 is_alive(__func__, "old request running");
2959 return BLK_STS_RESOURCE;
2962 spin_lock_irq(&floppy_lock);
2963 list_add_tail(&bd->rq->queuelist, &floppy_reqs);
2964 spin_unlock_irq(&floppy_lock);
2966 command_status = FD_COMMAND_NONE;
2967 __reschedule_timeout(MAXTIMEOUT, "fd_request");
2969 process_fd_request();
2970 is_alive(__func__, "");
2974 static const struct cont_t poll_cont = {
2975 .interrupt = success_and_wakeup,
2976 .redo = floppy_ready,
2977 .error = generic_failure,
2978 .done = generic_done
2981 static int poll_drive(bool interruptible, int flag)
2983 /* no auto-sense, just clear dcl */
2984 raw_cmd = &default_raw_cmd;
2985 raw_cmd->flags = flag;
2987 raw_cmd->cmd_count = 0;
2989 debug_dcl(drive_params[current_drive].flags,
2990 "setting NEWCHANGE in poll_drive\n");
2991 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags);
2993 return wait_til_done(floppy_ready, interruptible);
2997 * User triggered reset
2998 * ====================
3001 static void reset_intr(void)
3003 pr_info("weird, reset interrupt called\n");
3006 static const struct cont_t reset_cont = {
3007 .interrupt = reset_intr,
3008 .redo = success_and_wakeup,
3009 .error = generic_failure,
3010 .done = generic_done
3014 * Resets the FDC connected to drive <drive>.
3015 * Both current_drive and current_fdc are changed to match the new drive.
3017 static int user_reset_fdc(int drive, int arg, bool interruptible)
3021 if (lock_fdc(drive))
3024 if (arg == FD_RESET_ALWAYS)
3025 fdc_state[current_fdc].reset = 1;
3026 if (fdc_state[current_fdc].reset) {
3027 /* note: reset_fdc will take care of unlocking the driver
3031 ret = wait_til_done(reset_fdc, interruptible);
3035 process_fd_request();
3040 * Misc Ioctl's and support
3041 * ========================
3043 static inline int fd_copyout(void __user *param, const void *address,
3046 return copy_to_user(param, address, size) ? -EFAULT : 0;
3049 static inline int fd_copyin(void __user *param, void *address,
3052 return copy_from_user(address, param, size) ? -EFAULT : 0;
3055 static const char *drive_name(int type, int drive)
3057 struct floppy_struct *floppy;
3060 floppy = floppy_type + type;
3062 if (drive_params[drive].native_format)
3063 floppy = floppy_type + drive_params[drive].native_format;
3068 return floppy->name;
3074 static void raw_cmd_done(int flag)
3079 raw_cmd->flags |= FD_RAW_FAILURE;
3080 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3082 raw_cmd->reply_count = inr;
3083 if (raw_cmd->reply_count > FD_RAW_REPLY_SIZE)
3084 raw_cmd->reply_count = 0;
3085 for (i = 0; i < raw_cmd->reply_count; i++)
3086 raw_cmd->reply[i] = reply_buffer[i];
3088 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3089 unsigned long flags;
3090 flags = claim_dma_lock();
3091 raw_cmd->length = fd_get_dma_residue();
3092 release_dma_lock(flags);
3095 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3096 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3097 raw_cmd->flags |= FD_RAW_FAILURE;
3099 if (disk_change(current_drive))
3100 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3102 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3103 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3104 motor_off_callback(&motor_off_timer[current_drive]);
3106 if (raw_cmd->next &&
3107 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3108 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3109 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3110 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3111 raw_cmd = raw_cmd->next;
3118 static const struct cont_t raw_cmd_cont = {
3119 .interrupt = success_and_wakeup,
3120 .redo = floppy_start,
3121 .error = generic_failure,
3122 .done = raw_cmd_done
3125 static int raw_cmd_copyout(int cmd, void __user *param,
3126 struct floppy_raw_cmd *ptr)
3131 struct floppy_raw_cmd cmd = *ptr;
3133 cmd.kernel_data = NULL;
3134 ret = copy_to_user(param, &cmd, sizeof(cmd));
3137 param += sizeof(struct floppy_raw_cmd);
3138 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3139 if (ptr->length >= 0 &&
3140 ptr->length <= ptr->buffer_length) {
3141 long length = ptr->buffer_length - ptr->length;
3142 ret = fd_copyout(ptr->data, ptr->kernel_data,
3154 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3156 struct floppy_raw_cmd *next;
3157 struct floppy_raw_cmd *this;
3162 if (this->buffer_length) {
3163 fd_dma_mem_free((unsigned long)this->kernel_data,
3164 this->buffer_length);
3165 this->buffer_length = 0;
3173 static int raw_cmd_copyin(int cmd, void __user *param,
3174 struct floppy_raw_cmd **rcmd)
3176 struct floppy_raw_cmd *ptr;
3183 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL);
3187 ret = copy_from_user(ptr, param, sizeof(*ptr));
3189 ptr->buffer_length = 0;
3190 ptr->kernel_data = NULL;
3193 param += sizeof(struct floppy_raw_cmd);
3194 if (ptr->cmd_count > FD_RAW_CMD_FULLSIZE)
3197 for (i = 0; i < FD_RAW_REPLY_SIZE; i++)
3199 ptr->resultcode = 0;
3201 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3202 if (ptr->length <= 0)
3204 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3205 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3206 if (!ptr->kernel_data)
3208 ptr->buffer_length = ptr->length;
3210 if (ptr->flags & FD_RAW_WRITE) {
3211 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3216 if (ptr->flags & FD_RAW_MORE) {
3217 rcmd = &(ptr->next);
3225 static int raw_cmd_ioctl(int cmd, void __user *param)
3227 struct floppy_raw_cmd *my_raw_cmd;
3232 if (fdc_state[current_fdc].rawcmd <= 1)
3233 fdc_state[current_fdc].rawcmd = 1;
3234 for (drive = 0; drive < N_DRIVE; drive++) {
3235 if (FDC(drive) != current_fdc)
3237 if (drive == current_drive) {
3238 if (drive_state[drive].fd_ref > 1) {
3239 fdc_state[current_fdc].rawcmd = 2;
3242 } else if (drive_state[drive].fd_ref) {
3243 fdc_state[current_fdc].rawcmd = 2;
3248 if (fdc_state[current_fdc].reset)
3251 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3253 raw_cmd_free(&my_raw_cmd);
3257 raw_cmd = my_raw_cmd;
3258 cont = &raw_cmd_cont;
3259 ret = wait_til_done(floppy_start, true);
3260 debug_dcl(drive_params[current_drive].flags,
3261 "calling disk change from raw_cmd ioctl\n");
3263 if (ret != -EINTR && fdc_state[current_fdc].reset)
3266 drive_state[current_drive].track = NO_TRACK;
3268 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3271 raw_cmd_free(&my_raw_cmd);
3275 static int invalidate_drive(struct block_device *bdev)
3277 /* invalidate the buffer track to force a reread */
3278 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3279 process_fd_request();
3280 if (bdev_check_media_change(bdev))
3281 floppy_revalidate(bdev->bd_disk);
3285 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3286 int drive, int type, struct block_device *bdev)
3290 /* sanity checking for parameters. */
3291 if ((int)g->sect <= 0 ||
3292 (int)g->head <= 0 ||
3293 /* check for overflow in max_sector */
3294 (int)(g->sect * g->head) <= 0 ||
3295 /* check for zero in raw_cmd->cmd[F_SECT_PER_TRACK] */
3296 (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 ||
3297 g->track <= 0 || g->track > drive_params[drive].tracks >> STRETCH(g) ||
3298 /* check if reserved bits are set */
3299 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3302 if (!capable(CAP_SYS_ADMIN))
3304 mutex_lock(&open_lock);
3305 if (lock_fdc(drive)) {
3306 mutex_unlock(&open_lock);
3309 floppy_type[type] = *g;
3310 floppy_type[type].name = "user format";
3311 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3312 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3313 floppy_type[type].size + 1;
3314 process_fd_request();
3315 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3316 struct block_device *bdev = opened_bdev[cnt];
3317 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3319 __invalidate_device(bdev, true);
3321 mutex_unlock(&open_lock);
3325 if (lock_fdc(drive))
3327 if (cmd != FDDEFPRM) {
3328 /* notice a disk change immediately, else
3329 * we lose our settings immediately*/
3330 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3333 oldStretch = g->stretch;
3334 user_params[drive] = *g;
3335 if (buffer_drive == drive)
3336 SUPBOUND(buffer_max, user_params[drive].sect);
3337 current_type[drive] = &user_params[drive];
3338 floppy_sizes[drive] = user_params[drive].size;
3339 if (cmd == FDDEFPRM)
3340 drive_state[current_drive].keep_data = -1;
3342 drive_state[current_drive].keep_data = 1;
3343 /* invalidation. Invalidate only when needed, i.e.
3344 * when there are already sectors in the buffer cache
3345 * whose number will change. This is useful, because
3346 * mtools often changes the geometry of the disk after
3347 * looking at the boot block */
3348 if (drive_state[current_drive].maxblock > user_params[drive].sect ||
3349 drive_state[current_drive].maxtrack ||
3350 ((user_params[drive].sect ^ oldStretch) &
3351 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3352 invalidate_drive(bdev);
3354 process_fd_request();
3359 /* handle obsolete ioctl's */
3360 static unsigned int ioctl_table[] = {
3388 static int normalize_ioctl(unsigned int *cmd, int *size)
3392 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3393 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3394 *size = _IOC_SIZE(*cmd);
3395 *cmd = ioctl_table[i];
3396 if (*size > _IOC_SIZE(*cmd)) {
3397 pr_info("ioctl not yet supported\n");
3406 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3409 *g = &floppy_type[type];
3411 if (lock_fdc(drive))
3413 if (poll_drive(false, 0) == -EINTR)
3415 process_fd_request();
3416 *g = current_type[drive];
3423 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3425 int drive = (long)bdev->bd_disk->private_data;
3426 int type = ITYPE(drive_state[drive].fd_device);
3427 struct floppy_struct *g;
3430 ret = get_floppy_geometry(drive, type, &g);
3434 geo->heads = g->head;
3435 geo->sectors = g->sect;
3436 geo->cylinders = g->track;
3440 static bool valid_floppy_drive_params(const short autodetect[FD_AUTODETECT_SIZE],
3443 size_t floppy_type_size = ARRAY_SIZE(floppy_type);
3446 for (i = 0; i < FD_AUTODETECT_SIZE; ++i) {
3447 if (autodetect[i] < 0 ||
3448 autodetect[i] >= floppy_type_size)
3452 if (native_format < 0 || native_format >= floppy_type_size)
3458 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3459 unsigned long param)
3461 int drive = (long)bdev->bd_disk->private_data;
3462 int type = ITYPE(drive_state[drive].fd_device);
3467 struct floppy_struct g; /* geometry */
3468 struct format_descr f;
3469 struct floppy_max_errors max_errors;
3470 struct floppy_drive_params dp;
3471 } inparam; /* parameters coming from user space */
3472 const void *outparam; /* parameters passed back to user space */
3474 /* convert compatibility eject ioctls into floppy eject ioctl.
3475 * We do this in order to provide a means to eject floppy disks before
3476 * installing the new fdutils package */
3477 if (cmd == CDROMEJECT || /* CD-ROM eject */
3478 cmd == 0x6470) { /* SunOS floppy eject */
3479 DPRINT("obsolete eject ioctl\n");
3480 DPRINT("please use floppycontrol --eject\n");
3484 if (!((cmd & 0xff00) == 0x0200))
3487 /* convert the old style command into a new style command */
3488 ret = normalize_ioctl(&cmd, &size);
3492 /* permission checks */
3493 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3494 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3497 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3501 memset(&inparam, 0, sizeof(inparam));
3502 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3503 ret = fd_copyin((void __user *)param, &inparam, size);
3510 if (drive_state[drive].fd_ref != 1)
3511 /* somebody else has this drive open */
3513 if (lock_fdc(drive))
3516 /* do the actual eject. Fails on
3517 * non-Sparc architectures */
3518 ret = fd_eject(UNIT(drive));
3520 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
3521 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
3522 process_fd_request();
3525 if (lock_fdc(drive))
3527 current_type[drive] = NULL;
3528 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3529 drive_state[drive].keep_data = 0;
3530 return invalidate_drive(bdev);
3533 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3535 ret = get_floppy_geometry(drive, type,
3536 (struct floppy_struct **)&outparam);
3539 memcpy(&inparam.g, outparam,
3540 offsetof(struct floppy_struct, name));
3541 outparam = &inparam.g;
3544 drive_params[drive].flags |= FTD_MSG;
3547 drive_params[drive].flags &= ~FTD_MSG;
3550 if (lock_fdc(drive))
3552 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3554 ret = drive_state[drive].flags;
3555 process_fd_request();
3556 if (ret & FD_VERIFY)
3558 if (!(ret & FD_DISK_WRITABLE))
3562 if (drive_state[drive].fd_ref != 1)
3564 return do_format(drive, &inparam.f);
3567 if (lock_fdc(drive))
3569 return invalidate_drive(bdev);
3570 case FDSETEMSGTRESH:
3571 drive_params[drive].max_errors.reporting = (unsigned short)(param & 0x0f);
3574 outparam = &drive_params[drive].max_errors;
3577 drive_params[drive].max_errors = inparam.max_errors;
3580 outparam = drive_name(type, drive);
3581 SUPBOUND(size, strlen((const char *)outparam) + 1);
3584 if (!valid_floppy_drive_params(inparam.dp.autodetect,
3585 inparam.dp.native_format))
3587 drive_params[drive] = inparam.dp;
3590 outparam = &drive_params[drive];
3593 if (lock_fdc(drive))
3595 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3597 process_fd_request();
3600 outparam = &drive_state[drive];
3603 return user_reset_fdc(drive, (int)param, true);
3605 outparam = &fdc_state[FDC(drive)];
3608 memset(&write_errors[drive], 0, sizeof(write_errors[drive]));
3611 outparam = &write_errors[drive];
3616 if (lock_fdc(drive))
3619 i = raw_cmd_ioctl(cmd, (void __user *)param);
3622 process_fd_request();
3625 if (lock_fdc(drive))
3627 twaddle(current_fdc, current_drive);
3628 process_fd_request();
3634 if (_IOC_DIR(cmd) & _IOC_READ)
3635 return fd_copyout((void __user *)param, outparam, size);
3640 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3641 unsigned int cmd, unsigned long param)
3645 mutex_lock(&floppy_mutex);
3646 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3647 mutex_unlock(&floppy_mutex);
3652 #ifdef CONFIG_COMPAT
3654 struct compat_floppy_drive_params {
3656 compat_ulong_t max_dtr;
3660 compat_ulong_t spinup;
3661 compat_ulong_t spindown;
3662 unsigned char spindown_offset;
3663 unsigned char select_delay;
3665 unsigned char tracks;
3666 compat_ulong_t timeout;
3667 unsigned char interleave_sect;
3668 struct floppy_max_errors max_errors;
3671 short autodetect[FD_AUTODETECT_SIZE];
3672 compat_int_t checkfreq;
3673 compat_int_t native_format;
3676 struct compat_floppy_drive_struct {
3678 compat_ulong_t spinup_date;
3679 compat_ulong_t select_date;
3680 compat_ulong_t first_read_date;
3681 short probed_format;
3685 compat_int_t generation;
3686 compat_int_t keep_data;
3687 compat_int_t fd_ref;
3688 compat_int_t fd_device;
3689 compat_int_t last_checked;
3690 compat_caddr_t dmabuf;
3691 compat_int_t bufblocks;
3694 struct compat_floppy_fdc_state {
3698 unsigned char version;
3700 compat_ulong_t address;
3701 unsigned int rawcmd:2;
3702 unsigned int reset:1;
3703 unsigned int need_configure:1;
3704 unsigned int perp_mode:2;
3705 unsigned int has_fifo:1;
3706 unsigned int driver_version;
3707 unsigned char track[4];
3710 struct compat_floppy_write_errors {
3711 unsigned int write_errors;
3712 compat_ulong_t first_error_sector;
3713 compat_int_t first_error_generation;
3714 compat_ulong_t last_error_sector;
3715 compat_int_t last_error_generation;
3716 compat_uint_t badness;
3719 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
3720 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
3721 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
3722 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
3723 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
3724 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
3725 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
3726 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
3728 static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3729 struct compat_floppy_struct __user *arg)
3731 struct floppy_struct v;
3735 BUILD_BUG_ON(offsetof(struct floppy_struct, name) !=
3736 offsetof(struct compat_floppy_struct, name));
3738 if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL)))
3741 memset(&v, 0, sizeof(struct floppy_struct));
3742 if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name)))
3745 mutex_lock(&floppy_mutex);
3746 drive = (long)bdev->bd_disk->private_data;
3747 type = ITYPE(drive_state[drive].fd_device);
3748 err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM,
3749 &v, drive, type, bdev);
3750 mutex_unlock(&floppy_mutex);
3754 static int compat_get_prm(int drive,
3755 struct compat_floppy_struct __user *arg)
3757 struct compat_floppy_struct v;
3758 struct floppy_struct *p;
3761 memset(&v, 0, sizeof(v));
3762 mutex_lock(&floppy_mutex);
3763 err = get_floppy_geometry(drive, ITYPE(drive_state[drive].fd_device),
3766 mutex_unlock(&floppy_mutex);
3769 memcpy(&v, p, offsetof(struct floppy_struct, name));
3770 mutex_unlock(&floppy_mutex);
3771 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct)))
3776 static int compat_setdrvprm(int drive,
3777 struct compat_floppy_drive_params __user *arg)
3779 struct compat_floppy_drive_params v;
3781 if (!capable(CAP_SYS_ADMIN))
3783 if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params)))
3785 if (!valid_floppy_drive_params(v.autodetect, v.native_format))
3787 mutex_lock(&floppy_mutex);
3788 drive_params[drive].cmos = v.cmos;
3789 drive_params[drive].max_dtr = v.max_dtr;
3790 drive_params[drive].hlt = v.hlt;
3791 drive_params[drive].hut = v.hut;
3792 drive_params[drive].srt = v.srt;
3793 drive_params[drive].spinup = v.spinup;
3794 drive_params[drive].spindown = v.spindown;
3795 drive_params[drive].spindown_offset = v.spindown_offset;
3796 drive_params[drive].select_delay = v.select_delay;
3797 drive_params[drive].rps = v.rps;
3798 drive_params[drive].tracks = v.tracks;
3799 drive_params[drive].timeout = v.timeout;
3800 drive_params[drive].interleave_sect = v.interleave_sect;
3801 drive_params[drive].max_errors = v.max_errors;
3802 drive_params[drive].flags = v.flags;
3803 drive_params[drive].read_track = v.read_track;
3804 memcpy(drive_params[drive].autodetect, v.autodetect,
3805 sizeof(v.autodetect));
3806 drive_params[drive].checkfreq = v.checkfreq;
3807 drive_params[drive].native_format = v.native_format;
3808 mutex_unlock(&floppy_mutex);
3812 static int compat_getdrvprm(int drive,
3813 struct compat_floppy_drive_params __user *arg)
3815 struct compat_floppy_drive_params v;
3817 memset(&v, 0, sizeof(struct compat_floppy_drive_params));
3818 mutex_lock(&floppy_mutex);
3819 v.cmos = drive_params[drive].cmos;
3820 v.max_dtr = drive_params[drive].max_dtr;
3821 v.hlt = drive_params[drive].hlt;
3822 v.hut = drive_params[drive].hut;
3823 v.srt = drive_params[drive].srt;
3824 v.spinup = drive_params[drive].spinup;
3825 v.spindown = drive_params[drive].spindown;
3826 v.spindown_offset = drive_params[drive].spindown_offset;
3827 v.select_delay = drive_params[drive].select_delay;
3828 v.rps = drive_params[drive].rps;
3829 v.tracks = drive_params[drive].tracks;
3830 v.timeout = drive_params[drive].timeout;
3831 v.interleave_sect = drive_params[drive].interleave_sect;
3832 v.max_errors = drive_params[drive].max_errors;
3833 v.flags = drive_params[drive].flags;
3834 v.read_track = drive_params[drive].read_track;
3835 memcpy(v.autodetect, drive_params[drive].autodetect,
3836 sizeof(v.autodetect));
3837 v.checkfreq = drive_params[drive].checkfreq;
3838 v.native_format = drive_params[drive].native_format;
3839 mutex_unlock(&floppy_mutex);
3841 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
3846 static int compat_getdrvstat(int drive, bool poll,
3847 struct compat_floppy_drive_struct __user *arg)
3849 struct compat_floppy_drive_struct v;
3851 memset(&v, 0, sizeof(struct compat_floppy_drive_struct));
3852 mutex_lock(&floppy_mutex);
3855 if (lock_fdc(drive))
3857 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3859 process_fd_request();
3861 v.spinup_date = drive_state[drive].spinup_date;
3862 v.select_date = drive_state[drive].select_date;
3863 v.first_read_date = drive_state[drive].first_read_date;
3864 v.probed_format = drive_state[drive].probed_format;
3865 v.track = drive_state[drive].track;
3866 v.maxblock = drive_state[drive].maxblock;
3867 v.maxtrack = drive_state[drive].maxtrack;
3868 v.generation = drive_state[drive].generation;
3869 v.keep_data = drive_state[drive].keep_data;
3870 v.fd_ref = drive_state[drive].fd_ref;
3871 v.fd_device = drive_state[drive].fd_device;
3872 v.last_checked = drive_state[drive].last_checked;
3873 v.dmabuf = (uintptr_t) drive_state[drive].dmabuf;
3874 v.bufblocks = drive_state[drive].bufblocks;
3875 mutex_unlock(&floppy_mutex);
3877 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
3881 mutex_unlock(&floppy_mutex);
3885 static int compat_getfdcstat(int drive,
3886 struct compat_floppy_fdc_state __user *arg)
3888 struct compat_floppy_fdc_state v32;
3889 struct floppy_fdc_state v;
3891 mutex_lock(&floppy_mutex);
3892 v = fdc_state[FDC(drive)];
3893 mutex_unlock(&floppy_mutex);
3895 memset(&v32, 0, sizeof(struct compat_floppy_fdc_state));
3896 v32.spec1 = v.spec1;
3897 v32.spec2 = v.spec2;
3899 v32.version = v.version;
3901 v32.address = v.address;
3902 v32.rawcmd = v.rawcmd;
3903 v32.reset = v.reset;
3904 v32.need_configure = v.need_configure;
3905 v32.perp_mode = v.perp_mode;
3906 v32.has_fifo = v.has_fifo;
3907 v32.driver_version = v.driver_version;
3908 memcpy(v32.track, v.track, 4);
3909 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state)))
3914 static int compat_werrorget(int drive,
3915 struct compat_floppy_write_errors __user *arg)
3917 struct compat_floppy_write_errors v32;
3918 struct floppy_write_errors v;
3920 memset(&v32, 0, sizeof(struct compat_floppy_write_errors));
3921 mutex_lock(&floppy_mutex);
3922 v = write_errors[drive];
3923 mutex_unlock(&floppy_mutex);
3924 v32.write_errors = v.write_errors;
3925 v32.first_error_sector = v.first_error_sector;
3926 v32.first_error_generation = v.first_error_generation;
3927 v32.last_error_sector = v.last_error_sector;
3928 v32.last_error_generation = v.last_error_generation;
3929 v32.badness = v.badness;
3930 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors)))
3935 static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3936 unsigned long param)
3938 int drive = (long)bdev->bd_disk->private_data;
3940 case CDROMEJECT: /* CD-ROM eject */
3941 case 0x6470: /* SunOS floppy eject */
3945 case FDSETEMSGTRESH:
3953 return fd_ioctl(bdev, mode, cmd, param);
3960 return fd_ioctl(bdev, mode, cmd,
3961 (unsigned long)compat_ptr(param));
3964 return compat_set_geometry(bdev, mode, cmd, compat_ptr(param));
3966 return compat_get_prm(drive, compat_ptr(param));
3968 return compat_setdrvprm(drive, compat_ptr(param));
3970 return compat_getdrvprm(drive, compat_ptr(param));
3971 case FDPOLLDRVSTAT32:
3972 return compat_getdrvstat(drive, true, compat_ptr(param));
3973 case FDGETDRVSTAT32:
3974 return compat_getdrvstat(drive, false, compat_ptr(param));
3975 case FDGETFDCSTAT32:
3976 return compat_getfdcstat(drive, compat_ptr(param));
3978 return compat_werrorget(drive, compat_ptr(param));
3984 static void __init config_types(void)
3986 bool has_drive = false;
3989 /* read drive info out of physical CMOS */
3991 if (!drive_params[drive].cmos)
3992 drive_params[drive].cmos = FLOPPY0_TYPE;
3994 if (!drive_params[drive].cmos)
3995 drive_params[drive].cmos = FLOPPY1_TYPE;
3997 /* FIXME: additional physical CMOS drive detection should go here */
3999 for (drive = 0; drive < N_DRIVE; drive++) {
4000 unsigned int type = drive_params[drive].cmos;
4001 struct floppy_drive_params *params;
4002 const char *name = NULL;
4005 if (type < ARRAY_SIZE(default_drive_params)) {
4006 params = &default_drive_params[type].params;
4008 name = default_drive_params[type].name;
4009 allowed_drive_mask |= 1 << drive;
4011 allowed_drive_mask &= ~(1 << drive);
4013 params = &default_drive_params[0].params;
4014 snprintf(temparea, sizeof(temparea),
4015 "unknown type %d (usb?)", type);
4019 const char *prepend;
4023 pr_info("Floppy drive(s):");
4028 pr_cont("%s fd%d is %s", prepend, drive, name);
4030 drive_params[drive] = *params;
4037 static void floppy_release(struct gendisk *disk, fmode_t mode)
4039 int drive = (long)disk->private_data;
4041 mutex_lock(&floppy_mutex);
4042 mutex_lock(&open_lock);
4043 if (!drive_state[drive].fd_ref--) {
4044 DPRINT("floppy_release with fd_ref == 0");
4045 drive_state[drive].fd_ref = 0;
4047 if (!drive_state[drive].fd_ref)
4048 opened_bdev[drive] = NULL;
4049 mutex_unlock(&open_lock);
4050 mutex_unlock(&floppy_mutex);
4054 * floppy_open check for aliasing (/dev/fd0 can be the same as
4055 * /dev/PS0 etc), and disallows simultaneous access to the same
4056 * drive with different device numbers.
4058 static int floppy_open(struct block_device *bdev, fmode_t mode)
4060 int drive = (long)bdev->bd_disk->private_data;
4061 int old_dev, new_dev;
4066 mutex_lock(&floppy_mutex);
4067 mutex_lock(&open_lock);
4068 old_dev = drive_state[drive].fd_device;
4069 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
4072 if (!drive_state[drive].fd_ref && (drive_params[drive].flags & FD_BROKEN_DCL)) {
4073 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
4074 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
4077 drive_state[drive].fd_ref++;
4079 opened_bdev[drive] = bdev;
4083 if (!floppy_track_buffer) {
4084 /* if opening an ED drive, reserve a big buffer,
4085 * else reserve a small one */
4086 if ((drive_params[drive].cmos == 6) || (drive_params[drive].cmos == 5))
4087 try = 64; /* Only 48 actually useful */
4089 try = 32; /* Only 24 actually useful */
4091 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4092 if (!tmp && !floppy_track_buffer) {
4093 try >>= 1; /* buffer only one side */
4095 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4097 if (!tmp && !floppy_track_buffer)
4098 fallback_on_nodma_alloc(&tmp, 2048 * try);
4099 if (!tmp && !floppy_track_buffer) {
4100 DPRINT("Unable to allocate DMA memory\n");
4103 if (floppy_track_buffer) {
4105 fd_dma_mem_free((unsigned long)tmp, try * 1024);
4107 buffer_min = buffer_max = -1;
4108 floppy_track_buffer = tmp;
4109 max_buffer_sectors = try;
4113 new_dev = MINOR(bdev->bd_dev);
4114 drive_state[drive].fd_device = new_dev;
4115 set_capacity(disks[drive][ITYPE(new_dev)], floppy_sizes[new_dev]);
4116 if (old_dev != -1 && old_dev != new_dev) {
4117 if (buffer_drive == drive)
4121 if (fdc_state[FDC(drive)].rawcmd == 1)
4122 fdc_state[FDC(drive)].rawcmd = 2;
4124 if (mode & (FMODE_READ|FMODE_WRITE)) {
4125 drive_state[drive].last_checked = 0;
4126 clear_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags);
4127 if (bdev_check_media_change(bdev))
4128 floppy_revalidate(bdev->bd_disk);
4129 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags))
4131 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags))
4137 if ((mode & FMODE_WRITE) &&
4138 !test_bit(FD_DISK_WRITABLE_BIT, &drive_state[drive].flags))
4141 mutex_unlock(&open_lock);
4142 mutex_unlock(&floppy_mutex);
4145 drive_state[drive].fd_ref--;
4147 if (!drive_state[drive].fd_ref)
4148 opened_bdev[drive] = NULL;
4150 mutex_unlock(&open_lock);
4151 mutex_unlock(&floppy_mutex);
4156 * Check if the disk has been changed or if a change has been faked.
4158 static unsigned int floppy_check_events(struct gendisk *disk,
4159 unsigned int clearing)
4161 int drive = (long)disk->private_data;
4163 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
4164 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags))
4165 return DISK_EVENT_MEDIA_CHANGE;
4167 if (time_after(jiffies, drive_state[drive].last_checked + drive_params[drive].checkfreq)) {
4168 if (lock_fdc(drive))
4170 poll_drive(false, 0);
4171 process_fd_request();
4174 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
4175 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) ||
4176 test_bit(drive, &fake_change) ||
4177 drive_no_geom(drive))
4178 return DISK_EVENT_MEDIA_CHANGE;
4183 * This implements "read block 0" for floppy_revalidate().
4184 * Needed for format autodetection, checking whether there is
4185 * a disk in the drive, and whether that disk is writable.
4190 struct completion complete;
4193 static void floppy_rb0_cb(struct bio *bio)
4195 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private;
4196 int drive = cbdata->drive;
4198 if (bio->bi_status) {
4199 pr_info("floppy: error %d while reading block 0\n",
4201 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags);
4203 complete(&cbdata->complete);
4206 static int __floppy_read_block_0(struct block_device *bdev, int drive)
4209 struct bio_vec bio_vec;
4211 struct rb0_cbdata cbdata;
4213 page = alloc_page(GFP_NOIO);
4215 process_fd_request();
4219 cbdata.drive = drive;
4221 bio_init(&bio, &bio_vec, 1);
4222 bio_set_dev(&bio, bdev);
4223 bio_add_page(&bio, page, block_size(bdev), 0);
4225 bio.bi_iter.bi_sector = 0;
4226 bio.bi_flags |= (1 << BIO_QUIET);
4227 bio.bi_private = &cbdata;
4228 bio.bi_end_io = floppy_rb0_cb;
4229 bio_set_op_attrs(&bio, REQ_OP_READ, 0);
4231 init_completion(&cbdata.complete);
4234 process_fd_request();
4236 wait_for_completion(&cbdata.complete);
4243 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
4244 * the bootblock (block 0). "Autodetection" is also needed to check whether
4245 * there is a disk in the drive at all... Thus we also do it for fixed
4246 * geometry formats */
4247 static int floppy_revalidate(struct gendisk *disk)
4249 int drive = (long)disk->private_data;
4253 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
4254 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) ||
4255 test_bit(drive, &fake_change) ||
4256 drive_no_geom(drive)) {
4257 if (WARN(atomic_read(&usage_count) == 0,
4258 "VFS: revalidate called on non-open device.\n"))
4261 res = lock_fdc(drive);
4264 cf = (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
4265 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags));
4266 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
4267 process_fd_request(); /*already done by another thread */
4270 drive_state[drive].maxblock = 0;
4271 drive_state[drive].maxtrack = 0;
4272 if (buffer_drive == drive)
4274 clear_bit(drive, &fake_change);
4275 clear_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
4277 drive_state[drive].generation++;
4278 if (drive_no_geom(drive)) {
4280 res = __floppy_read_block_0(opened_bdev[drive], drive);
4283 poll_drive(false, FD_RAW_NEED_DISK);
4284 process_fd_request();
4287 set_capacity(disk, floppy_sizes[drive_state[drive].fd_device]);
4291 static const struct block_device_operations floppy_fops = {
4292 .owner = THIS_MODULE,
4293 .open = floppy_open,
4294 .release = floppy_release,
4296 .getgeo = fd_getgeo,
4297 .check_events = floppy_check_events,
4298 #ifdef CONFIG_COMPAT
4299 .compat_ioctl = fd_compat_ioctl,
4304 * Floppy Driver initialization
4305 * =============================
4308 /* Determine the floppy disk controller type */
4309 /* This routine was written by David C. Niemi */
4310 static char __init get_fdc_version(int fdc)
4314 output_byte(fdc, FD_DUMPREGS); /* 82072 and better know DUMPREGS */
4315 if (fdc_state[fdc].reset)
4319 return FDC_NONE; /* No FDC present ??? */
4320 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4321 pr_info("FDC %d is an 8272A\n", fdc);
4322 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
4325 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
4330 if (!fdc_configure(fdc)) {
4331 pr_info("FDC %d is an 82072\n", fdc);
4332 return FDC_82072; /* 82072 doesn't know CONFIGURE */
4335 output_byte(fdc, FD_PERPENDICULAR);
4336 if (need_more_output(fdc) == MORE_OUTPUT) {
4337 output_byte(fdc, 0);
4339 pr_info("FDC %d is an 82072A\n", fdc);
4340 return FDC_82072A; /* 82072A as found on Sparcs. */
4343 output_byte(fdc, FD_UNLOCK);
4345 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4346 pr_info("FDC %d is a pre-1991 82077\n", fdc);
4347 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
4350 if ((r != 1) || (reply_buffer[0] != 0x00)) {
4351 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
4355 output_byte(fdc, FD_PARTID);
4358 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
4362 if (reply_buffer[0] == 0x80) {
4363 pr_info("FDC %d is a post-1991 82077\n", fdc);
4364 return FDC_82077; /* Revised 82077AA passes all the tests */
4366 switch (reply_buffer[0] >> 5) {
4368 /* Either a 82078-1 or a 82078SL running at 5Volt */
4369 pr_info("FDC %d is an 82078.\n", fdc);
4372 pr_info("FDC %d is a 44pin 82078\n", fdc);
4375 pr_info("FDC %d is a S82078B\n", fdc);
4378 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
4381 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4382 fdc, reply_buffer[0] >> 5);
4383 return FDC_82078_UNKN;
4385 } /* get_fdc_version */
4387 /* lilo configuration */
4389 static void __init floppy_set_flags(int *ints, int param, int param2)
4393 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4395 default_drive_params[i].params.flags |= param2;
4397 default_drive_params[i].params.flags &= ~param2;
4399 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4402 static void __init daring(int *ints, int param, int param2)
4406 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4408 default_drive_params[i].params.select_delay = 0;
4409 default_drive_params[i].params.flags |=
4410 FD_SILENT_DCL_CLEAR;
4412 default_drive_params[i].params.select_delay =
4414 default_drive_params[i].params.flags &=
4415 ~FD_SILENT_DCL_CLEAR;
4418 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4421 static void __init set_cmos(int *ints, int dummy, int dummy2)
4423 int current_drive = 0;
4426 DPRINT("wrong number of parameters for CMOS\n");
4429 current_drive = ints[1];
4430 if (current_drive < 0 || current_drive >= 8) {
4431 DPRINT("bad drive for set_cmos\n");
4435 if (current_drive >= 4 && !FDC2)
4438 drive_params[current_drive].cmos = ints[2];
4439 DPRINT("setting CMOS code to %d\n", ints[2]);
4442 static struct param_table {
4444 void (*fn) (int *ints, int param, int param2);
4448 } config_params[] __initdata = {
4449 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4450 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4451 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4452 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4453 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4454 {"daring", daring, NULL, 1, 0},
4456 {"two_fdc", NULL, &FDC2, 0x370, 0},
4457 {"one_fdc", NULL, &FDC2, 0, 0},
4459 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4460 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4461 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4462 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4463 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4464 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4465 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4466 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4467 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4468 {"nofifo", NULL, &no_fifo, 0x20, 0},
4469 {"usefifo", NULL, &no_fifo, 0, 0},
4470 {"cmos", set_cmos, NULL, 0, 0},
4471 {"slow", NULL, &slow_floppy, 1, 0},
4472 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4473 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4474 {"L40SX", NULL, &print_unex, 0, 0}
4479 static int __init floppy_setup(char *str)
4485 str = get_options(str, ARRAY_SIZE(ints), ints);
4487 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4488 if (strcmp(str, config_params[i].name) == 0) {
4492 param = config_params[i].def_param;
4493 if (config_params[i].fn)
4494 config_params[i].fn(ints, param,
4497 if (config_params[i].var) {
4498 DPRINT("%s=%d\n", str, param);
4499 *config_params[i].var = param;
4506 DPRINT("unknown floppy option [%s]\n", str);
4508 DPRINT("allowed options are:");
4509 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4510 pr_cont(" %s", config_params[i].name);
4513 DPRINT("botched floppy option\n");
4514 DPRINT("Read Documentation/admin-guide/blockdev/floppy.rst\n");
4518 static int have_no_fdc = -ENODEV;
4520 static ssize_t floppy_cmos_show(struct device *dev,
4521 struct device_attribute *attr, char *buf)
4523 struct platform_device *p = to_platform_device(dev);
4527 return sprintf(buf, "%X\n", drive_params[drive].cmos);
4530 static DEVICE_ATTR(cmos, 0444, floppy_cmos_show, NULL);
4532 static struct attribute *floppy_dev_attrs[] = {
4533 &dev_attr_cmos.attr,
4537 ATTRIBUTE_GROUPS(floppy_dev);
4539 static void floppy_device_release(struct device *dev)
4543 static int floppy_resume(struct device *dev)
4548 saved_drive = current_drive;
4549 for (fdc = 0; fdc < N_FDC; fdc++)
4550 if (fdc_state[fdc].address != -1)
4551 user_reset_fdc(REVDRIVE(fdc, 0), FD_RESET_ALWAYS, false);
4552 set_fdc(saved_drive);
4556 static const struct dev_pm_ops floppy_pm_ops = {
4557 .resume = floppy_resume,
4558 .restore = floppy_resume,
4561 static struct platform_driver floppy_driver = {
4564 .pm = &floppy_pm_ops,
4568 static const struct blk_mq_ops floppy_mq_ops = {
4569 .queue_rq = floppy_queue_rq,
4572 static struct platform_device floppy_device[N_DRIVE];
4574 static bool floppy_available(int drive)
4576 if (!(allowed_drive_mask & (1 << drive)))
4578 if (fdc_state[FDC(drive)].version == FDC_NONE)
4583 static int floppy_alloc_disk(unsigned int drive, unsigned int type)
4585 struct gendisk *disk;
4588 disk = alloc_disk(1);
4592 disk->queue = blk_mq_init_queue(&tag_sets[drive]);
4593 if (IS_ERR(disk->queue)) {
4594 err = PTR_ERR(disk->queue);
4600 blk_queue_bounce_limit(disk->queue, BLK_BOUNCE_HIGH);
4601 blk_queue_max_hw_sectors(disk->queue, 64);
4602 disk->major = FLOPPY_MAJOR;
4603 disk->first_minor = TOMINOR(drive) | (type << 2);
4604 disk->fops = &floppy_fops;
4605 disk->events = DISK_EVENT_MEDIA_CHANGE;
4607 sprintf(disk->disk_name, "fd%d_type%d", drive, type);
4609 sprintf(disk->disk_name, "fd%d", drive);
4610 /* to be cleaned up... */
4611 disk->private_data = (void *)(long)drive;
4612 disk->flags |= GENHD_FL_REMOVABLE;
4614 disks[drive][type] = disk;
4618 static DEFINE_MUTEX(floppy_probe_lock);
4620 static void floppy_probe(dev_t dev)
4622 unsigned int drive = (MINOR(dev) & 3) | ((MINOR(dev) & 0x80) >> 5);
4623 unsigned int type = (MINOR(dev) >> 2) & 0x1f;
4625 if (drive >= N_DRIVE || !floppy_available(drive) ||
4626 type >= ARRAY_SIZE(floppy_type))
4629 mutex_lock(&floppy_probe_lock);
4630 if (!disks[drive][type]) {
4631 if (floppy_alloc_disk(drive, type) == 0)
4632 add_disk(disks[drive][type]);
4634 mutex_unlock(&floppy_probe_lock);
4637 static int __init do_floppy_init(void)
4639 int i, unit, drive, err;
4642 interruptjiffies = resultjiffies = jiffies;
4644 #if defined(CONFIG_PPC)
4645 if (check_legacy_ioport(FDC1))
4651 floppy_wq = alloc_ordered_workqueue("floppy", 0);
4655 for (drive = 0; drive < N_DRIVE; drive++) {
4656 memset(&tag_sets[drive], 0, sizeof(tag_sets[drive]));
4657 tag_sets[drive].ops = &floppy_mq_ops;
4658 tag_sets[drive].nr_hw_queues = 1;
4659 tag_sets[drive].nr_maps = 1;
4660 tag_sets[drive].queue_depth = 2;
4661 tag_sets[drive].numa_node = NUMA_NO_NODE;
4662 tag_sets[drive].flags = BLK_MQ_F_SHOULD_MERGE;
4663 err = blk_mq_alloc_tag_set(&tag_sets[drive]);
4667 err = floppy_alloc_disk(drive, 0);
4671 timer_setup(&motor_off_timer[drive], motor_off_callback, 0);
4674 err = __register_blkdev(FLOPPY_MAJOR, "fd", floppy_probe);
4678 err = platform_driver_register(&floppy_driver);
4680 goto out_unreg_blkdev;
4682 for (i = 0; i < 256; i++)
4684 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4686 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4688 reschedule_timeout(MAXTIMEOUT, "floppy init");
4691 for (i = 0; i < N_FDC; i++) {
4692 memset(&fdc_state[i], 0, sizeof(*fdc_state));
4693 fdc_state[i].dtr = -1;
4694 fdc_state[i].dor = 0x4;
4695 #if defined(__sparc__) || defined(__mc68000__)
4696 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4700 fdc_state[i].version = FDC_82072A;
4704 use_virtual_dma = can_use_virtual_dma & 1;
4705 fdc_state[0].address = FDC1;
4706 if (fdc_state[0].address == -1) {
4707 cancel_delayed_work(&fd_timeout);
4709 goto out_unreg_driver;
4712 fdc_state[1].address = FDC2;
4715 current_fdc = 0; /* reset fdc in case of unexpected interrupt */
4716 err = floppy_grab_irq_and_dma();
4718 cancel_delayed_work(&fd_timeout);
4720 goto out_unreg_driver;
4723 /* initialise drive state */
4724 for (drive = 0; drive < N_DRIVE; drive++) {
4725 memset(&drive_state[drive], 0, sizeof(drive_state[drive]));
4726 memset(&write_errors[drive], 0, sizeof(write_errors[drive]));
4727 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags);
4728 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
4729 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
4730 drive_state[drive].fd_device = -1;
4731 floppy_track_buffer = NULL;
4732 max_buffer_sectors = 0;
4735 * Small 10 msec delay to let through any interrupt that
4736 * initialization might have triggered, to not
4737 * confuse detection:
4741 for (i = 0; i < N_FDC; i++) {
4742 fdc_state[i].driver_version = FD_DRIVER_VERSION;
4743 for (unit = 0; unit < 4; unit++)
4744 fdc_state[i].track[unit] = 0;
4745 if (fdc_state[i].address == -1)
4747 fdc_state[i].rawcmd = 2;
4748 if (user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false)) {
4749 /* free ioports reserved by floppy_grab_irq_and_dma() */
4750 floppy_release_regions(i);
4751 fdc_state[i].address = -1;
4752 fdc_state[i].version = FDC_NONE;
4755 /* Try to determine the floppy controller type */
4756 fdc_state[i].version = get_fdc_version(i);
4757 if (fdc_state[i].version == FDC_NONE) {
4758 /* free ioports reserved by floppy_grab_irq_and_dma() */
4759 floppy_release_regions(i);
4760 fdc_state[i].address = -1;
4763 if (can_use_virtual_dma == 2 &&
4764 fdc_state[i].version < FDC_82072A)
4765 can_use_virtual_dma = 0;
4768 /* Not all FDCs seem to be able to handle the version command
4769 * properly, so force a reset for the standard FDC clones,
4770 * to avoid interrupt garbage.
4772 user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false);
4775 cancel_delayed_work(&fd_timeout);
4779 DPRINT("no floppy controllers found\n");
4781 goto out_release_dma;
4784 for (drive = 0; drive < N_DRIVE; drive++) {
4785 if (!floppy_available(drive))
4788 floppy_device[drive].name = floppy_device_name;
4789 floppy_device[drive].id = drive;
4790 floppy_device[drive].dev.release = floppy_device_release;
4791 floppy_device[drive].dev.groups = floppy_dev_groups;
4793 err = platform_device_register(&floppy_device[drive]);
4795 goto out_remove_drives;
4797 device_add_disk(&floppy_device[drive].dev, disks[drive][0],
4805 if (floppy_available(drive)) {
4806 del_gendisk(disks[drive][0]);
4807 platform_device_unregister(&floppy_device[drive]);
4811 if (atomic_read(&usage_count))
4812 floppy_release_irq_and_dma();
4814 platform_driver_unregister(&floppy_driver);
4816 unregister_blkdev(FLOPPY_MAJOR, "fd");
4818 destroy_workqueue(floppy_wq);
4819 for (drive = 0; drive < N_DRIVE; drive++) {
4820 if (!disks[drive][0])
4822 del_timer_sync(&motor_off_timer[drive]);
4823 blk_cleanup_queue(disks[drive][0]->queue);
4824 disks[drive][0]->queue = NULL;
4825 blk_mq_free_tag_set(&tag_sets[drive]);
4826 put_disk(disks[drive][0]);
4832 static __init void floppy_async_init(void *data, async_cookie_t cookie)
4838 static int __init floppy_init(void)
4841 return do_floppy_init();
4843 /* Don't hold up the bootup by the floppy initialization */
4844 async_schedule(floppy_async_init, NULL);
4849 static const struct io_region {
4854 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4856 /* address + 6 is reserved, and may be taken by IDE.
4857 * Unfortunately, Adaptec doesn't know this :-(, */
4861 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4863 while (p != io_regions) {
4865 release_region(fdc_state[fdc].address + p->offset, p->size);
4869 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4871 static int floppy_request_regions(int fdc)
4873 const struct io_region *p;
4875 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4876 if (!request_region(fdc_state[fdc].address + p->offset,
4877 p->size, "floppy")) {
4878 DPRINT("Floppy io-port 0x%04lx in use\n",
4879 fdc_state[fdc].address + p->offset);
4880 floppy_release_allocated_regions(fdc, p);
4887 static void floppy_release_regions(int fdc)
4889 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4892 static int floppy_grab_irq_and_dma(void)
4896 if (atomic_inc_return(&usage_count) > 1)
4900 * We might have scheduled a free_irq(), wait it to
4903 flush_workqueue(floppy_wq);
4905 if (fd_request_irq()) {
4906 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4908 atomic_dec(&usage_count);
4911 if (fd_request_dma()) {
4912 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4914 if (can_use_virtual_dma & 2)
4915 use_virtual_dma = can_use_virtual_dma = 1;
4916 if (!(can_use_virtual_dma & 1)) {
4918 atomic_dec(&usage_count);
4923 for (fdc = 0; fdc < N_FDC; fdc++) {
4924 if (fdc_state[fdc].address != -1) {
4925 if (floppy_request_regions(fdc))
4929 for (fdc = 0; fdc < N_FDC; fdc++) {
4930 if (fdc_state[fdc].address != -1) {
4931 reset_fdc_info(fdc, 1);
4932 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
4936 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4938 for (fdc = 0; fdc < N_FDC; fdc++)
4939 if (fdc_state[fdc].address != -1)
4940 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
4942 * The driver will try and free resources and relies on us
4943 * to know if they were allocated or not.
4946 irqdma_allocated = 1;
4952 floppy_release_regions(fdc);
4954 atomic_dec(&usage_count);
4958 static void floppy_release_irq_and_dma(void)
4965 unsigned long tmpaddr;
4967 if (!atomic_dec_and_test(&usage_count))
4970 if (irqdma_allocated) {
4974 irqdma_allocated = 0;
4981 if (floppy_track_buffer && max_buffer_sectors) {
4982 tmpsize = max_buffer_sectors * 1024;
4983 tmpaddr = (unsigned long)floppy_track_buffer;
4984 floppy_track_buffer = NULL;
4985 max_buffer_sectors = 0;
4986 buffer_min = buffer_max = -1;
4987 fd_dma_mem_free(tmpaddr, tmpsize);
4990 for (drive = 0; drive < N_FDC * 4; drive++)
4991 if (timer_pending(motor_off_timer + drive))
4992 pr_info("motor off timer %d still active\n", drive);
4995 if (delayed_work_pending(&fd_timeout))
4996 pr_info("floppy timer still active:%s\n", timeout_message);
4997 if (delayed_work_pending(&fd_timer))
4998 pr_info("auxiliary floppy timer still active\n");
4999 if (work_pending(&floppy_work))
5000 pr_info("work still pending\n");
5001 for (fdc = 0; fdc < N_FDC; fdc++)
5002 if (fdc_state[fdc].address != -1)
5003 floppy_release_regions(fdc);
5008 static char *floppy;
5010 static void __init parse_floppy_cfg_string(char *cfg)
5016 while (*cfg && *cfg != ' ' && *cfg != '\t')
5027 static int __init floppy_module_init(void)
5030 parse_floppy_cfg_string(floppy);
5031 return floppy_init();
5033 module_init(floppy_module_init);
5035 static void __exit floppy_module_exit(void)
5039 unregister_blkdev(FLOPPY_MAJOR, "fd");
5040 platform_driver_unregister(&floppy_driver);
5042 destroy_workqueue(floppy_wq);
5044 for (drive = 0; drive < N_DRIVE; drive++) {
5045 del_timer_sync(&motor_off_timer[drive]);
5047 if (floppy_available(drive)) {
5048 for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
5049 if (disks[drive][i])
5050 del_gendisk(disks[drive][i]);
5052 platform_device_unregister(&floppy_device[drive]);
5054 for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
5055 if (disks[drive][i])
5056 blk_cleanup_queue(disks[drive][i]->queue);
5058 blk_mq_free_tag_set(&tag_sets[drive]);
5061 * These disks have not called add_disk(). Don't put down
5062 * queue reference in put_disk().
5064 if (!(allowed_drive_mask & (1 << drive)) ||
5065 fdc_state[FDC(drive)].version == FDC_NONE) {
5066 for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
5067 if (disks[drive][i])
5068 disks[drive][i]->queue = NULL;
5072 for (i = 0; i < ARRAY_SIZE(floppy_type); i++) {
5073 if (disks[drive][i])
5074 put_disk(disks[drive][i]);
5078 cancel_delayed_work_sync(&fd_timeout);
5079 cancel_delayed_work_sync(&fd_timer);
5081 if (atomic_read(&usage_count))
5082 floppy_release_irq_and_dma();
5084 /* eject disk, if any */
5088 module_exit(floppy_module_exit);
5090 module_param(floppy, charp, 0);
5091 module_param(FLOPPY_IRQ, int, 0);
5092 module_param(FLOPPY_DMA, int, 0);
5093 MODULE_AUTHOR("Alain L. Knaff");
5094 MODULE_SUPPORTED_DEVICE("fd");
5095 MODULE_LICENSE("GPL");
5097 /* This doesn't actually get used other than for module information */
5098 static const struct pnp_device_id floppy_pnpids[] = {
5103 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
5107 __setup("floppy=", floppy_setup);
5108 module_init(floppy_init)
5111 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);