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 gendisk *disks[N_DRIVE];
406 static struct blk_mq_tag_set tag_sets[N_DRIVE];
407 static struct block_device *opened_bdev[N_DRIVE];
408 static DEFINE_MUTEX(open_lock);
409 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
412 * This struct defines the different floppy types.
414 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
415 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
416 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
417 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
418 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
419 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
420 * side 0 is on physical side 0 (but with the misnamed sector IDs).
421 * 'stretch' should probably be renamed to something more general, like
424 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
425 * The LSB (bit 2) is flipped. For most disks, the first sector
426 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
427 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
428 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
430 * Other parameters should be self-explanatory (see also setfdprm(8)).
439 | | | | | | Data rate, | 0x40 for perp
440 | | | | | | | Spec1 (stepping rate, head unload
441 | | | | | | | | /fmt gap (gap2) */
442 static struct floppy_struct floppy_type[32] = {
443 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
444 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
445 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
446 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
447 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
448 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
449 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
450 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
451 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
452 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
454 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
455 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
456 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
457 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
458 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
459 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
460 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
461 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
462 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
463 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
465 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
466 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
467 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
468 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
469 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
470 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
471 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
472 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
473 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
474 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
476 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
477 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
480 #define SECTSIZE (_FD_SECTSIZE(*floppy))
482 /* Auto-detection: Disk type used until the next media change occurs. */
483 static struct floppy_struct *current_type[N_DRIVE];
486 * User-provided type information. current_type points to
487 * the respective entry of this array.
489 static struct floppy_struct user_params[N_DRIVE];
491 static sector_t floppy_sizes[256];
493 static char floppy_device_name[] = "floppy";
496 * The driver is trying to determine the correct media format
497 * while probing is set. rw_interrupt() clears it after a
502 /* Synchronization of FDC access. */
503 #define FD_COMMAND_NONE -1
504 #define FD_COMMAND_ERROR 2
505 #define FD_COMMAND_OKAY 3
507 static volatile int command_status = FD_COMMAND_NONE;
508 static unsigned long fdc_busy;
509 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
510 static DECLARE_WAIT_QUEUE_HEAD(command_done);
512 /* Errors during formatting are counted here. */
513 static int format_errors;
515 /* Format request descriptor. */
516 static struct format_descr format_req;
519 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
520 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
521 * H is head unload time (1=16ms, 2=32ms, etc)
526 * Because these are written to by the DMA controller, they must
527 * not contain a 64k byte boundary crossing, or data will be
530 static char *floppy_track_buffer;
531 static int max_buffer_sectors;
534 typedef void (*done_f)(int);
535 static const struct cont_t {
536 void (*interrupt)(void);
537 /* this is called after the interrupt of the
539 void (*redo)(void); /* this is called to retry the operation */
540 void (*error)(void); /* this is called to tally an error */
541 done_f done; /* this is called to say if the operation has
542 * succeeded/failed */
545 static void floppy_ready(void);
546 static void floppy_start(void);
547 static void process_fd_request(void);
548 static void recalibrate_floppy(void);
549 static void floppy_shutdown(struct work_struct *);
551 static int floppy_request_regions(int);
552 static void floppy_release_regions(int);
553 static int floppy_grab_irq_and_dma(void);
554 static void floppy_release_irq_and_dma(void);
557 * The "reset" variable should be tested whenever an interrupt is scheduled,
558 * after the commands have been sent. This is to ensure that the driver doesn't
559 * get wedged when the interrupt doesn't come because of a failed command.
560 * reset doesn't need to be tested before sending commands, because
561 * output_byte is automatically disabled when reset is set.
563 static void reset_fdc(void);
564 static int floppy_revalidate(struct gendisk *disk);
567 * These are global variables, as that's the easiest way to give
568 * information to interrupts. They are the data used for the current
572 #define NEED_1_RECAL -2
573 #define NEED_2_RECAL -3
575 static atomic_t usage_count = ATOMIC_INIT(0);
577 /* buffer related variables */
578 static int buffer_track = -1;
579 static int buffer_drive = -1;
580 static int buffer_min = -1;
581 static int buffer_max = -1;
583 /* fdc related variables, should end up in a struct */
584 static struct floppy_fdc_state fdc_state[N_FDC];
585 static int current_fdc; /* current fdc */
587 static struct workqueue_struct *floppy_wq;
589 static struct floppy_struct *_floppy = floppy_type;
590 static unsigned char current_drive;
591 static long current_count_sectors;
592 static unsigned char fsector_t; /* sector in track */
593 static unsigned char in_sector_offset; /* offset within physical sector,
594 * expressed in units of 512 bytes */
596 static inline unsigned char fdc_inb(int fdc, int reg)
598 return fd_inb(fdc_state[fdc].address, reg);
601 static inline void fdc_outb(unsigned char value, int fdc, int reg)
603 fd_outb(value, fdc_state[fdc].address, reg);
606 static inline bool drive_no_geom(int drive)
608 return !current_type[drive] && !ITYPE(drive_state[drive].fd_device);
612 static inline int fd_eject(int drive)
623 static long unsigned debugtimer;
625 static inline void set_debugt(void)
627 debugtimer = jiffies;
630 static inline void debugt(const char *func, const char *msg)
632 if (drive_params[current_drive].flags & DEBUGT)
633 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
636 static inline void set_debugt(void) { }
637 static inline void debugt(const char *func, const char *msg) { }
641 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
642 static const char *timeout_message;
644 static void is_alive(const char *func, const char *message)
646 /* this routine checks whether the floppy driver is "alive" */
647 if (test_bit(0, &fdc_busy) && command_status < 2 &&
648 !delayed_work_pending(&fd_timeout)) {
649 DPRINT("%s: timeout handler died. %s\n", func, message);
653 static void (*do_floppy)(void) = NULL;
657 static void (*lasthandler)(void);
658 static unsigned long interruptjiffies;
659 static unsigned long resultjiffies;
660 static int resultsize;
661 static unsigned long lastredo;
663 static struct output_log {
665 unsigned char status;
666 unsigned long jiffies;
667 } output_log[OLOGSIZE];
669 static int output_log_pos;
671 #define MAXTIMEOUT -2
673 static void __reschedule_timeout(int drive, const char *message)
677 if (drive < 0 || drive >= N_DRIVE) {
681 delay = drive_params[drive].timeout;
683 mod_delayed_work(floppy_wq, &fd_timeout, delay);
684 if (drive_params[drive].flags & FD_DEBUG)
685 DPRINT("reschedule timeout %s\n", message);
686 timeout_message = message;
689 static void reschedule_timeout(int drive, const char *message)
693 spin_lock_irqsave(&floppy_lock, flags);
694 __reschedule_timeout(drive, message);
695 spin_unlock_irqrestore(&floppy_lock, flags);
698 #define INFBOUND(a, b) (a) = max_t(int, a, b)
699 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
702 * Bottom half floppy driver.
703 * ==========================
705 * This part of the file contains the code talking directly to the hardware,
706 * and also the main service loop (seek-configure-spinup-command)
711 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
712 * and the last_checked date.
714 * last_checked is the date of the last check which showed 'no disk change'
715 * FD_DISK_CHANGE is set under two conditions:
716 * 1. The floppy has been changed after some i/o to that floppy already
718 * 2. No floppy disk is in the drive. This is done in order to ensure that
719 * requests are quickly flushed in case there is no disk in the drive. It
720 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
723 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
724 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
725 * each seek. If a disk is present, the disk change line should also be
726 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
727 * change line is set, this means either that no disk is in the drive, or
728 * that it has been removed since the last seek.
730 * This means that we really have a third possibility too:
731 * The floppy has been changed after the last seek.
734 static int disk_change(int drive)
736 int fdc = FDC(drive);
738 if (time_before(jiffies, drive_state[drive].select_date + drive_params[drive].select_delay))
739 DPRINT("WARNING disk change called early\n");
740 if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))) ||
741 (fdc_state[fdc].dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
742 DPRINT("probing disk change on unselected drive\n");
743 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
744 (unsigned int)fdc_state[fdc].dor);
747 debug_dcl(drive_params[drive].flags,
748 "checking disk change line for drive %d\n", drive);
749 debug_dcl(drive_params[drive].flags, "jiffies=%lu\n", jiffies);
750 debug_dcl(drive_params[drive].flags, "disk change line=%x\n",
751 fdc_inb(fdc, FD_DIR) & 0x80);
752 debug_dcl(drive_params[drive].flags, "flags=%lx\n",
753 drive_state[drive].flags);
755 if (drive_params[drive].flags & FD_BROKEN_DCL)
756 return test_bit(FD_DISK_CHANGED_BIT,
757 &drive_state[drive].flags);
758 if ((fdc_inb(fdc, FD_DIR) ^ drive_params[drive].flags) & 0x80) {
759 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
760 /* verify write protection */
762 if (drive_state[drive].maxblock) /* mark it changed */
763 set_bit(FD_DISK_CHANGED_BIT,
764 &drive_state[drive].flags);
766 /* invalidate its geometry */
767 if (drive_state[drive].keep_data >= 0) {
768 if ((drive_params[drive].flags & FTD_MSG) &&
769 current_type[drive] != NULL)
770 DPRINT("Disk type is undefined after disk change\n");
771 current_type[drive] = NULL;
772 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
777 drive_state[drive].last_checked = jiffies;
778 clear_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags);
783 static inline int is_selected(int dor, int unit)
785 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
788 static bool is_ready_state(int status)
790 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
791 return state == STATUS_READY;
794 static int set_dor(int fdc, char mask, char data)
798 unsigned char newdor;
799 unsigned char olddor;
801 if (fdc_state[fdc].address == -1)
804 olddor = fdc_state[fdc].dor;
805 newdor = (olddor & mask) | data;
806 if (newdor != olddor) {
808 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
809 drive = REVDRIVE(fdc, unit);
810 debug_dcl(drive_params[drive].flags,
811 "calling disk change from set_dor\n");
814 fdc_state[fdc].dor = newdor;
815 fdc_outb(newdor, fdc, FD_DOR);
818 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
819 drive = REVDRIVE(fdc, unit);
820 drive_state[drive].select_date = jiffies;
826 static void twaddle(int fdc, int drive)
828 if (drive_params[drive].select_delay)
830 fdc_outb(fdc_state[fdc].dor & ~(0x10 << UNIT(drive)),
832 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
833 drive_state[drive].select_date = jiffies;
837 * Reset all driver information about the specified fdc.
838 * This is needed after a reset, and after a raw command.
840 static void reset_fdc_info(int fdc, int mode)
844 fdc_state[fdc].spec1 = fdc_state[fdc].spec2 = -1;
845 fdc_state[fdc].need_configure = 1;
846 fdc_state[fdc].perp_mode = 1;
847 fdc_state[fdc].rawcmd = 0;
848 for (drive = 0; drive < N_DRIVE; drive++)
849 if (FDC(drive) == fdc &&
850 (mode || drive_state[drive].track != NEED_1_RECAL))
851 drive_state[drive].track = NEED_2_RECAL;
855 * selects the fdc and drive, and enables the fdc's input/dma.
856 * Both current_drive and current_fdc are changed to match the new drive.
858 static void set_fdc(int drive)
862 if (drive < 0 || drive >= N_DRIVE) {
863 pr_info("bad drive value %d\n", drive);
869 pr_info("bad fdc value\n");
875 set_dor(1 - fdc, ~8, 0);
877 if (fdc_state[fdc].rawcmd == 2)
878 reset_fdc_info(fdc, 1);
879 if (fdc_inb(fdc, FD_STATUS) != STATUS_READY)
880 fdc_state[fdc].reset = 1;
882 current_drive = drive;
888 * Both current_drive and current_fdc are changed to match the new drive.
890 static int lock_fdc(int drive)
892 if (WARN(atomic_read(&usage_count) == 0,
893 "Trying to lock fdc while usage count=0\n"))
896 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
899 command_status = FD_COMMAND_NONE;
901 reschedule_timeout(drive, "lock fdc");
906 /* unlocks the driver */
907 static void unlock_fdc(void)
909 if (!test_bit(0, &fdc_busy))
910 DPRINT("FDC access conflict!\n");
913 command_status = FD_COMMAND_NONE;
914 cancel_delayed_work(&fd_timeout);
917 clear_bit(0, &fdc_busy);
921 /* switches the motor off after a given timeout */
922 static void motor_off_callback(struct timer_list *t)
924 unsigned long nr = t - motor_off_timer;
925 unsigned char mask = ~(0x10 << UNIT(nr));
927 if (WARN_ON_ONCE(nr >= N_DRIVE))
930 set_dor(FDC(nr), mask, 0);
933 /* schedules motor off */
934 static void floppy_off(unsigned int drive)
936 unsigned long volatile delta;
937 int fdc = FDC(drive);
939 if (!(fdc_state[fdc].dor & (0x10 << UNIT(drive))))
942 del_timer(motor_off_timer + drive);
944 /* make spindle stop in a position which minimizes spinup time
946 if (drive_params[drive].rps) {
947 delta = jiffies - drive_state[drive].first_read_date + HZ -
948 drive_params[drive].spindown_offset;
949 delta = ((delta * drive_params[drive].rps) % HZ) / drive_params[drive].rps;
950 motor_off_timer[drive].expires =
951 jiffies + drive_params[drive].spindown - delta;
953 add_timer(motor_off_timer + drive);
957 * cycle through all N_DRIVE floppy drives, for disk change testing.
958 * stopping at current drive. This is done before any long operation, to
959 * be sure to have up to date disk change information.
961 static void scandrives(void)
967 if (drive_params[current_drive].select_delay)
970 saved_drive = current_drive;
971 for (i = 0; i < N_DRIVE; i++) {
972 drive = (saved_drive + i + 1) % N_DRIVE;
973 if (drive_state[drive].fd_ref == 0 || drive_params[drive].select_delay != 0)
974 continue; /* skip closed drives */
976 if (!(set_dor(current_fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
977 (0x10 << UNIT(drive))))
978 /* switch the motor off again, if it was off to
980 set_dor(current_fdc, ~(0x10 << UNIT(drive)), 0);
982 set_fdc(saved_drive);
985 static void empty(void)
989 static void (*floppy_work_fn)(void);
991 static void floppy_work_workfn(struct work_struct *work)
996 static DECLARE_WORK(floppy_work, floppy_work_workfn);
998 static void schedule_bh(void (*handler)(void))
1000 WARN_ON(work_pending(&floppy_work));
1002 floppy_work_fn = handler;
1003 queue_work(floppy_wq, &floppy_work);
1006 static void (*fd_timer_fn)(void) = NULL;
1008 static void fd_timer_workfn(struct work_struct *work)
1013 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
1015 static void cancel_activity(void)
1018 cancel_delayed_work_sync(&fd_timer);
1019 cancel_work_sync(&floppy_work);
1022 /* this function makes sure that the disk stays in the drive during the
1024 static void fd_watchdog(void)
1026 debug_dcl(drive_params[current_drive].flags,
1027 "calling disk change from watchdog\n");
1029 if (disk_change(current_drive)) {
1030 DPRINT("disk removed during i/o\n");
1035 cancel_delayed_work(&fd_timer);
1036 fd_timer_fn = fd_watchdog;
1037 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
1041 static void main_command_interrupt(void)
1043 cancel_delayed_work(&fd_timer);
1047 /* waits for a delay (spinup or select) to pass */
1048 static int fd_wait_for_completion(unsigned long expires,
1049 void (*function)(void))
1051 if (fdc_state[current_fdc].reset) {
1052 reset_fdc(); /* do the reset during sleep to win time
1053 * if we don't need to sleep, it's a good
1054 * occasion anyways */
1058 if (time_before(jiffies, expires)) {
1059 cancel_delayed_work(&fd_timer);
1060 fd_timer_fn = function;
1061 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
1067 static void setup_DMA(void)
1071 if (raw_cmd->length == 0) {
1072 print_hex_dump(KERN_INFO, "zero dma transfer size: ",
1073 DUMP_PREFIX_NONE, 16, 1,
1074 raw_cmd->fullcmd, raw_cmd->cmd_count, false);
1076 fdc_state[current_fdc].reset = 1;
1079 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1080 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1082 fdc_state[current_fdc].reset = 1;
1085 f = claim_dma_lock();
1088 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1089 (raw_cmd->flags & FD_RAW_READ) ?
1090 DMA_MODE_READ : DMA_MODE_WRITE,
1091 fdc_state[current_fdc].address) < 0) {
1092 release_dma_lock(f);
1094 fdc_state[current_fdc].reset = 1;
1097 release_dma_lock(f);
1100 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1101 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1102 DMA_MODE_READ : DMA_MODE_WRITE);
1103 fd_set_dma_addr(raw_cmd->kernel_data);
1104 fd_set_dma_count(raw_cmd->length);
1105 virtual_dma_port = fdc_state[current_fdc].address;
1107 release_dma_lock(f);
1111 static void show_floppy(int fdc);
1113 /* waits until the fdc becomes ready */
1114 static int wait_til_ready(int fdc)
1119 if (fdc_state[fdc].reset)
1121 for (counter = 0; counter < 10000; counter++) {
1122 status = fdc_inb(fdc, FD_STATUS);
1123 if (status & STATUS_READY)
1127 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1130 fdc_state[fdc].reset = 1;
1134 /* sends a command byte to the fdc */
1135 static int output_byte(int fdc, char byte)
1137 int status = wait_til_ready(fdc);
1142 if (is_ready_state(status)) {
1143 fdc_outb(byte, fdc, FD_DATA);
1144 output_log[output_log_pos].data = byte;
1145 output_log[output_log_pos].status = status;
1146 output_log[output_log_pos].jiffies = jiffies;
1147 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1150 fdc_state[fdc].reset = 1;
1152 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1159 /* gets the response from the fdc */
1160 static int result(int fdc)
1165 for (i = 0; i < FD_RAW_REPLY_SIZE; i++) {
1166 status = wait_til_ready(fdc);
1169 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1170 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1171 resultjiffies = jiffies;
1175 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1176 reply_buffer[i] = fdc_inb(fdc, FD_DATA);
1181 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1185 fdc_state[fdc].reset = 1;
1189 #define MORE_OUTPUT -2
1190 /* does the fdc need more output? */
1191 static int need_more_output(int fdc)
1193 int status = wait_til_ready(fdc);
1198 if (is_ready_state(status))
1204 /* Set perpendicular mode as required, based on data rate, if supported.
1205 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1207 static void perpendicular_mode(int fdc)
1209 unsigned char perp_mode;
1211 if (raw_cmd->rate & 0x40) {
1212 switch (raw_cmd->rate & 3) {
1220 DPRINT("Invalid data rate for perpendicular mode!\n");
1222 fdc_state[fdc].reset = 1;
1224 * convenient way to return to
1225 * redo without too much hassle
1226 * (deep stack et al.)
1233 if (fdc_state[fdc].perp_mode == perp_mode)
1235 if (fdc_state[fdc].version >= FDC_82077_ORIG) {
1236 output_byte(fdc, FD_PERPENDICULAR);
1237 output_byte(fdc, perp_mode);
1238 fdc_state[fdc].perp_mode = perp_mode;
1239 } else if (perp_mode) {
1240 DPRINT("perpendicular mode not supported by this FDC.\n");
1242 } /* perpendicular_mode */
1244 static int fifo_depth = 0xa;
1247 static int fdc_configure(int fdc)
1250 output_byte(fdc, FD_CONFIGURE);
1251 if (need_more_output(fdc) != MORE_OUTPUT)
1253 output_byte(fdc, 0);
1254 output_byte(fdc, 0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1255 output_byte(fdc, 0); /* pre-compensation from track 0 upwards */
1259 #define NOMINAL_DTR 500
1261 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1262 * head load time, and DMA disable flag to values needed by floppy.
1264 * The value "dtr" is the data transfer rate in Kbps. It is needed
1265 * to account for the data rate-based scaling done by the 82072 and 82077
1266 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1269 * Note that changing the data transfer rate has a (probably deleterious)
1270 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1271 * fdc_specify is called again after each data transfer rate
1274 * srt: 1000 to 16000 in microseconds
1275 * hut: 16 to 240 milliseconds
1276 * hlt: 2 to 254 milliseconds
1278 * These values are rounded up to the next highest available delay time.
1280 static void fdc_specify(int fdc, int drive)
1282 unsigned char spec1;
1283 unsigned char spec2;
1287 unsigned long dtr = NOMINAL_DTR;
1288 unsigned long scale_dtr = NOMINAL_DTR;
1289 int hlt_max_code = 0x7f;
1290 int hut_max_code = 0xf;
1292 if (fdc_state[fdc].need_configure &&
1293 fdc_state[fdc].version >= FDC_82072A) {
1295 fdc_state[fdc].need_configure = 0;
1298 switch (raw_cmd->rate & 0x03) {
1304 if (fdc_state[fdc].version >= FDC_82078) {
1305 /* chose the default rate table, not the one
1306 * where 1 = 2 Mbps */
1307 output_byte(fdc, FD_DRIVESPEC);
1308 if (need_more_output(fdc) == MORE_OUTPUT) {
1309 output_byte(fdc, UNIT(drive));
1310 output_byte(fdc, 0xc0);
1319 if (fdc_state[fdc].version >= FDC_82072) {
1321 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1322 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1325 /* Convert step rate from microseconds to milliseconds and 4 bits */
1326 srt = 16 - DIV_ROUND_UP(drive_params[drive].srt * scale_dtr / 1000,
1334 hlt = DIV_ROUND_UP(drive_params[drive].hlt * scale_dtr / 2,
1338 else if (hlt > 0x7f)
1341 hut = DIV_ROUND_UP(drive_params[drive].hut * scale_dtr / 16,
1348 spec1 = (srt << 4) | hut;
1349 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1351 /* If these parameters did not change, just return with success */
1352 if (fdc_state[fdc].spec1 != spec1 ||
1353 fdc_state[fdc].spec2 != spec2) {
1354 /* Go ahead and set spec1 and spec2 */
1355 output_byte(fdc, FD_SPECIFY);
1356 output_byte(fdc, fdc_state[fdc].spec1 = spec1);
1357 output_byte(fdc, fdc_state[fdc].spec2 = spec2);
1361 /* Set the FDC's data transfer rate on behalf of the specified drive.
1362 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1363 * of the specify command (i.e. using the fdc_specify function).
1365 static int fdc_dtr(void)
1367 /* If data rate not already set to desired value, set it. */
1368 if ((raw_cmd->rate & 3) == fdc_state[current_fdc].dtr)
1372 fdc_outb(raw_cmd->rate & 3, current_fdc, FD_DCR);
1374 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1375 * need a stabilization period of several milliseconds to be
1376 * enforced after data rate changes before R/W operations.
1377 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1379 fdc_state[current_fdc].dtr = raw_cmd->rate & 3;
1380 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready);
1383 static void tell_sector(void)
1385 pr_cont(": track %d, head %d, sector %d, size %d",
1386 reply_buffer[R_TRACK], reply_buffer[R_HEAD],
1387 reply_buffer[R_SECTOR],
1388 reply_buffer[R_SIZECODE]);
1391 static void print_errors(void)
1394 if (reply_buffer[ST0] & ST0_ECE) {
1395 pr_cont("Recalibrate failed!");
1396 } else if (reply_buffer[ST2] & ST2_CRC) {
1397 pr_cont("data CRC error");
1399 } else if (reply_buffer[ST1] & ST1_CRC) {
1400 pr_cont("CRC error");
1402 } else if ((reply_buffer[ST1] & (ST1_MAM | ST1_ND)) ||
1403 (reply_buffer[ST2] & ST2_MAM)) {
1405 pr_cont("sector not found");
1408 pr_cont("probe failed...");
1409 } else if (reply_buffer[ST2] & ST2_WC) { /* seek error */
1410 pr_cont("wrong cylinder");
1411 } else if (reply_buffer[ST2] & ST2_BC) { /* cylinder marked as bad */
1412 pr_cont("bad cylinder");
1414 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1415 reply_buffer[ST0], reply_buffer[ST1],
1423 * OK, this error interpreting routine is called after a
1424 * DMA read/write has succeeded
1425 * or failed, so we check the results, and copy any buffers.
1426 * hhb: Added better error reporting.
1427 * ak: Made this into a separate routine.
1429 static int interpret_errors(void)
1434 DPRINT("-- FDC reply error\n");
1435 fdc_state[current_fdc].reset = 1;
1439 /* check IC to find cause of interrupt */
1440 switch (reply_buffer[ST0] & ST0_INTR) {
1441 case 0x40: /* error occurred during command execution */
1442 if (reply_buffer[ST1] & ST1_EOC)
1443 return 0; /* occurs with pseudo-DMA */
1445 if (reply_buffer[ST1] & ST1_WP) {
1446 DPRINT("Drive is write protected\n");
1447 clear_bit(FD_DISK_WRITABLE_BIT,
1448 &drive_state[current_drive].flags);
1451 } else if (reply_buffer[ST1] & ST1_ND) {
1452 set_bit(FD_NEED_TWADDLE_BIT,
1453 &drive_state[current_drive].flags);
1454 } else if (reply_buffer[ST1] & ST1_OR) {
1455 if (drive_params[current_drive].flags & FTD_MSG)
1456 DPRINT("Over/Underrun - retrying\n");
1458 } else if (*errors >= drive_params[current_drive].max_errors.reporting) {
1461 if (reply_buffer[ST2] & ST2_WC || reply_buffer[ST2] & ST2_BC)
1462 /* wrong cylinder => recal */
1463 drive_state[current_drive].track = NEED_2_RECAL;
1465 case 0x80: /* invalid command given */
1466 DPRINT("Invalid FDC command given!\n");
1470 DPRINT("Abnormal termination caused by polling\n");
1473 default: /* (0) Normal command termination */
1479 * This routine is called when everything should be correctly set up
1480 * for the transfer (i.e. floppy motor is on, the correct floppy is
1481 * selected, and the head is sitting on the right track).
1483 static void setup_rw_floppy(void)
1488 unsigned long ready_date;
1489 void (*function)(void);
1491 flags = raw_cmd->flags;
1492 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1493 flags |= FD_RAW_INTR;
1495 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1496 ready_date = drive_state[current_drive].spinup_date + drive_params[current_drive].spinup;
1497 /* If spinup will take a long time, rerun scandrives
1498 * again just before spinup completion. Beware that
1499 * after scandrives, we must again wait for selection.
1501 if (time_after(ready_date, jiffies + drive_params[current_drive].select_delay)) {
1502 ready_date -= drive_params[current_drive].select_delay;
1503 function = floppy_start;
1505 function = setup_rw_floppy;
1507 /* wait until the floppy is spinning fast enough */
1508 if (fd_wait_for_completion(ready_date, function))
1511 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1514 if (flags & FD_RAW_INTR)
1515 do_floppy = main_command_interrupt;
1518 for (i = 0; i < raw_cmd->cmd_count; i++)
1519 r |= output_byte(current_fdc, raw_cmd->fullcmd[i]);
1521 debugt(__func__, "rw_command");
1529 if (!(flags & FD_RAW_INTR)) {
1530 inr = result(current_fdc);
1532 } else if (flags & FD_RAW_NEED_DISK)
1536 static int blind_seek;
1539 * This is the routine called after every seek (or recalibrate) interrupt
1540 * from the floppy controller.
1542 static void seek_interrupt(void)
1544 debugt(__func__, "");
1545 if (inr != 2 || (reply_buffer[ST0] & 0xF8) != 0x20) {
1546 DPRINT("seek failed\n");
1547 drive_state[current_drive].track = NEED_2_RECAL;
1552 if (drive_state[current_drive].track >= 0 &&
1553 drive_state[current_drive].track != reply_buffer[ST1] &&
1555 debug_dcl(drive_params[current_drive].flags,
1556 "clearing NEWCHANGE flag because of effective seek\n");
1557 debug_dcl(drive_params[current_drive].flags, "jiffies=%lu\n",
1559 clear_bit(FD_DISK_NEWCHANGE_BIT,
1560 &drive_state[current_drive].flags);
1561 /* effective seek */
1562 drive_state[current_drive].select_date = jiffies;
1564 drive_state[current_drive].track = reply_buffer[ST1];
1568 static void check_wp(int fdc, int drive)
1570 if (test_bit(FD_VERIFY_BIT, &drive_state[drive].flags)) {
1571 /* check write protection */
1572 output_byte(fdc, FD_GETSTATUS);
1573 output_byte(fdc, UNIT(drive));
1574 if (result(fdc) != 1) {
1575 fdc_state[fdc].reset = 1;
1578 clear_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
1579 clear_bit(FD_NEED_TWADDLE_BIT,
1580 &drive_state[drive].flags);
1581 debug_dcl(drive_params[drive].flags,
1582 "checking whether disk is write protected\n");
1583 debug_dcl(drive_params[drive].flags, "wp=%x\n",
1584 reply_buffer[ST3] & 0x40);
1585 if (!(reply_buffer[ST3] & 0x40))
1586 set_bit(FD_DISK_WRITABLE_BIT,
1587 &drive_state[drive].flags);
1589 clear_bit(FD_DISK_WRITABLE_BIT,
1590 &drive_state[drive].flags);
1594 static void seek_floppy(void)
1600 debug_dcl(drive_params[current_drive].flags,
1601 "calling disk change from %s\n", __func__);
1603 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) &&
1604 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1605 /* the media changed flag should be cleared after the seek.
1606 * If it isn't, this means that there is really no disk in
1609 set_bit(FD_DISK_CHANGED_BIT,
1610 &drive_state[current_drive].flags);
1615 if (drive_state[current_drive].track <= NEED_1_RECAL) {
1616 recalibrate_floppy();
1618 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags) &&
1619 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1620 (drive_state[current_drive].track <= NO_TRACK || drive_state[current_drive].track == raw_cmd->track)) {
1621 /* we seek to clear the media-changed condition. Does anybody
1622 * know a more elegant way, which works on all drives? */
1624 track = raw_cmd->track - 1;
1626 if (drive_params[current_drive].flags & FD_SILENT_DCL_CLEAR) {
1627 set_dor(current_fdc, ~(0x10 << UNIT(current_drive)), 0);
1629 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1634 check_wp(current_fdc, current_drive);
1635 if (raw_cmd->track != drive_state[current_drive].track &&
1636 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1637 track = raw_cmd->track;
1644 do_floppy = seek_interrupt;
1645 output_byte(current_fdc, FD_SEEK);
1646 output_byte(current_fdc, UNIT(current_drive));
1647 if (output_byte(current_fdc, track) < 0) {
1651 debugt(__func__, "");
1654 static void recal_interrupt(void)
1656 debugt(__func__, "");
1658 fdc_state[current_fdc].reset = 1;
1659 else if (reply_buffer[ST0] & ST0_ECE) {
1660 switch (drive_state[current_drive].track) {
1662 debugt(__func__, "need 1 recal");
1663 /* after a second recalibrate, we still haven't
1664 * reached track 0. Probably no drive. Raise an
1665 * error, as failing immediately might upset
1666 * computers possessed by the Devil :-) */
1671 debugt(__func__, "need 2 recal");
1672 /* If we already did a recalibrate,
1673 * and we are not at track 0, this
1674 * means we have moved. (The only way
1675 * not to move at recalibration is to
1676 * be already at track 0.) Clear the
1677 * new change flag */
1678 debug_dcl(drive_params[current_drive].flags,
1679 "clearing NEWCHANGE flag because of second recalibrate\n");
1681 clear_bit(FD_DISK_NEWCHANGE_BIT,
1682 &drive_state[current_drive].flags);
1683 drive_state[current_drive].select_date = jiffies;
1686 debugt(__func__, "default");
1687 /* Recalibrate moves the head by at
1688 * most 80 steps. If after one
1689 * recalibrate we don't have reached
1690 * track 0, this might mean that we
1691 * started beyond track 80. Try
1693 drive_state[current_drive].track = NEED_1_RECAL;
1697 drive_state[current_drive].track = reply_buffer[ST1];
1701 static void print_result(char *message, int inr)
1705 DPRINT("%s ", message);
1707 for (i = 0; i < inr; i++)
1708 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1712 /* interrupt handler. Note that this can be called externally on the Sparc */
1713 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1717 void (*handler)(void) = do_floppy;
1719 lasthandler = handler;
1720 interruptjiffies = jiffies;
1722 f = claim_dma_lock();
1724 release_dma_lock(f);
1727 if (current_fdc >= N_FDC || fdc_state[current_fdc].address == -1) {
1728 /* we don't even know which FDC is the culprit */
1729 pr_info("DOR0=%x\n", fdc_state[0].dor);
1730 pr_info("floppy interrupt on bizarre fdc %d\n", current_fdc);
1731 pr_info("handler=%ps\n", handler);
1732 is_alive(__func__, "bizarre fdc");
1736 fdc_state[current_fdc].reset = 0;
1737 /* We have to clear the reset flag here, because apparently on boxes
1738 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1739 * emit SENSEI's to clear the interrupt line. And fdc_state[fdc].reset
1740 * blocks the emission of the SENSEI's.
1741 * It is OK to emit floppy commands because we are in an interrupt
1742 * handler here, and thus we have to fear no interference of other
1746 do_print = !handler && print_unex && initialized;
1748 inr = result(current_fdc);
1750 print_result("unexpected interrupt", inr);
1754 output_byte(current_fdc, FD_SENSEI);
1755 inr = result(current_fdc);
1757 print_result("sensei", inr);
1759 } while ((reply_buffer[ST0] & 0x83) != UNIT(current_drive) &&
1760 inr == 2 && max_sensei);
1763 fdc_state[current_fdc].reset = 1;
1766 schedule_bh(handler);
1767 is_alive(__func__, "normal interrupt end");
1769 /* FIXME! Was it really for us? */
1773 static void recalibrate_floppy(void)
1775 debugt(__func__, "");
1776 do_floppy = recal_interrupt;
1777 output_byte(current_fdc, FD_RECALIBRATE);
1778 if (output_byte(current_fdc, UNIT(current_drive)) < 0)
1783 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1785 static void reset_interrupt(void)
1787 debugt(__func__, "");
1788 result(current_fdc); /* get the status ready for set_fdc */
1789 if (fdc_state[current_fdc].reset) {
1790 pr_info("reset set in interrupt, calling %ps\n", cont->error);
1791 cont->error(); /* a reset just after a reset. BAD! */
1797 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1798 * or by setting the self clearing bit 7 of STATUS (newer FDCs).
1799 * This WILL trigger an interrupt, causing the handlers in the current
1800 * cont's ->redo() to be called via reset_interrupt().
1802 static void reset_fdc(void)
1804 unsigned long flags;
1806 do_floppy = reset_interrupt;
1807 fdc_state[current_fdc].reset = 0;
1808 reset_fdc_info(current_fdc, 0);
1810 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1811 /* Irrelevant for systems with true DMA (i386). */
1813 flags = claim_dma_lock();
1815 release_dma_lock(flags);
1817 if (fdc_state[current_fdc].version >= FDC_82072A)
1818 fdc_outb(0x80 | (fdc_state[current_fdc].dtr & 3),
1819 current_fdc, FD_STATUS);
1821 fdc_outb(fdc_state[current_fdc].dor & ~0x04, current_fdc, FD_DOR);
1822 udelay(FD_RESET_DELAY);
1823 fdc_outb(fdc_state[current_fdc].dor, current_fdc, FD_DOR);
1827 static void show_floppy(int fdc)
1832 pr_info("floppy driver state\n");
1833 pr_info("-------------------\n");
1834 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%ps\n",
1835 jiffies, interruptjiffies, jiffies - interruptjiffies,
1838 pr_info("timeout_message=%s\n", timeout_message);
1839 pr_info("last output bytes:\n");
1840 for (i = 0; i < OLOGSIZE; i++)
1841 pr_info("%2x %2x %lu\n",
1842 output_log[(i + output_log_pos) % OLOGSIZE].data,
1843 output_log[(i + output_log_pos) % OLOGSIZE].status,
1844 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1845 pr_info("last result at %lu\n", resultjiffies);
1846 pr_info("last redo_fd_request at %lu\n", lastredo);
1847 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1848 reply_buffer, resultsize, true);
1850 pr_info("status=%x\n", fdc_inb(fdc, FD_STATUS));
1851 pr_info("fdc_busy=%lu\n", fdc_busy);
1853 pr_info("do_floppy=%ps\n", do_floppy);
1854 if (work_pending(&floppy_work))
1855 pr_info("floppy_work.func=%ps\n", floppy_work.func);
1856 if (delayed_work_pending(&fd_timer))
1857 pr_info("delayed work.function=%p expires=%ld\n",
1859 fd_timer.timer.expires - jiffies);
1860 if (delayed_work_pending(&fd_timeout))
1861 pr_info("timer_function=%p expires=%ld\n",
1862 fd_timeout.work.func,
1863 fd_timeout.timer.expires - jiffies);
1865 pr_info("cont=%p\n", cont);
1866 pr_info("current_req=%p\n", current_req);
1867 pr_info("command_status=%d\n", command_status);
1871 static void floppy_shutdown(struct work_struct *arg)
1873 unsigned long flags;
1876 show_floppy(current_fdc);
1879 flags = claim_dma_lock();
1881 release_dma_lock(flags);
1883 /* avoid dma going to a random drive after shutdown */
1886 DPRINT("floppy timeout called\n");
1887 fdc_state[current_fdc].reset = 1;
1890 cont->redo(); /* this will recall reset when needed */
1892 pr_info("no cont in shutdown!\n");
1893 process_fd_request();
1895 is_alive(__func__, "");
1898 /* start motor, check media-changed condition and write protection */
1899 static int start_motor(void (*function)(void))
1905 data = UNIT(current_drive);
1906 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1907 if (!(fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))) {
1909 /* no read since this drive is running */
1910 drive_state[current_drive].first_read_date = 0;
1911 /* note motor start time if motor is not yet running */
1912 drive_state[current_drive].spinup_date = jiffies;
1913 data |= (0x10 << UNIT(current_drive));
1915 } else if (fdc_state[current_fdc].dor & (0x10 << UNIT(current_drive)))
1916 mask &= ~(0x10 << UNIT(current_drive));
1918 /* starts motor and selects floppy */
1919 del_timer(motor_off_timer + current_drive);
1920 set_dor(current_fdc, mask, data);
1922 /* wait_for_completion also schedules reset if needed. */
1923 return fd_wait_for_completion(drive_state[current_drive].select_date + drive_params[current_drive].select_delay,
1927 static void floppy_ready(void)
1929 if (fdc_state[current_fdc].reset) {
1933 if (start_motor(floppy_ready))
1938 debug_dcl(drive_params[current_drive].flags,
1939 "calling disk change from floppy_ready\n");
1940 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1941 disk_change(current_drive) && !drive_params[current_drive].select_delay)
1942 twaddle(current_fdc, current_drive); /* this clears the dcl on certain
1943 * drive/controller combinations */
1945 #ifdef fd_chose_dma_mode
1946 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1947 unsigned long flags = claim_dma_lock();
1948 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1949 release_dma_lock(flags);
1953 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1954 perpendicular_mode(current_fdc);
1955 fdc_specify(current_fdc, current_drive); /* must be done here because of hut, hlt ... */
1958 if ((raw_cmd->flags & FD_RAW_READ) ||
1959 (raw_cmd->flags & FD_RAW_WRITE))
1960 fdc_specify(current_fdc, current_drive);
1965 static void floppy_start(void)
1967 reschedule_timeout(current_drive, "floppy start");
1970 debug_dcl(drive_params[current_drive].flags,
1971 "setting NEWCHANGE in floppy_start\n");
1972 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags);
1977 * ========================================================================
1978 * here ends the bottom half. Exported routines are:
1979 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1980 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1981 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1983 * ========================================================================
1986 * General purpose continuations.
1987 * ==============================
1990 static void do_wakeup(void)
1992 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1994 command_status += 2;
1995 wake_up(&command_done);
1998 static const struct cont_t wakeup_cont = {
2002 .done = (done_f)empty
2005 static const struct cont_t intr_cont = {
2007 .redo = process_fd_request,
2009 .done = (done_f)empty
2012 /* schedules handler, waiting for completion. May be interrupted, will then
2013 * return -EINTR, in which case the driver will automatically be unlocked.
2015 static int wait_til_done(void (*handler)(void), bool interruptible)
2019 schedule_bh(handler);
2022 wait_event_interruptible(command_done, command_status >= 2);
2024 wait_event(command_done, command_status >= 2);
2026 if (command_status < 2) {
2033 if (fdc_state[current_fdc].reset)
2034 command_status = FD_COMMAND_ERROR;
2035 if (command_status == FD_COMMAND_OKAY)
2039 command_status = FD_COMMAND_NONE;
2043 static void generic_done(int result)
2045 command_status = result;
2046 cont = &wakeup_cont;
2049 static void generic_success(void)
2054 static void generic_failure(void)
2059 static void success_and_wakeup(void)
2066 * formatting and rw support.
2067 * ==========================
2070 static int next_valid_format(int drive)
2074 probed_format = drive_state[drive].probed_format;
2076 if (probed_format >= FD_AUTODETECT_SIZE ||
2077 !drive_params[drive].autodetect[probed_format]) {
2078 drive_state[drive].probed_format = 0;
2081 if (floppy_type[drive_params[drive].autodetect[probed_format]].sect) {
2082 drive_state[drive].probed_format = probed_format;
2089 static void bad_flp_intr(void)
2094 drive_state[current_drive].probed_format++;
2095 if (!next_valid_format(current_drive))
2098 err_count = ++(*errors);
2099 INFBOUND(write_errors[current_drive].badness, err_count);
2100 if (err_count > drive_params[current_drive].max_errors.abort)
2102 if (err_count > drive_params[current_drive].max_errors.reset)
2103 fdc_state[current_fdc].reset = 1;
2104 else if (err_count > drive_params[current_drive].max_errors.recal)
2105 drive_state[current_drive].track = NEED_2_RECAL;
2108 static void set_floppy(int drive)
2110 int type = ITYPE(drive_state[drive].fd_device);
2113 _floppy = floppy_type + type;
2115 _floppy = current_type[drive];
2119 * formatting support.
2120 * ===================
2122 static void format_interrupt(void)
2124 switch (interpret_errors()) {
2135 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2136 #define CT(x) ((x) | 0xc0)
2138 static void setup_format_params(int track)
2146 unsigned char track, head, sect, size;
2147 } *here = (struct fparm *)floppy_track_buffer;
2149 raw_cmd = &default_raw_cmd;
2150 raw_cmd->track = track;
2152 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2153 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2154 raw_cmd->rate = _floppy->rate & 0x43;
2155 raw_cmd->cmd_count = NR_F;
2156 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_FORMAT);
2157 raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2158 raw_cmd->cmd[F_SIZECODE] = FD_SIZECODE(_floppy);
2159 raw_cmd->cmd[F_SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[F_SIZECODE];
2160 raw_cmd->cmd[F_GAP] = _floppy->fmt_gap;
2161 raw_cmd->cmd[F_FILL] = FD_FILL_BYTE;
2163 raw_cmd->kernel_data = floppy_track_buffer;
2164 raw_cmd->length = 4 * raw_cmd->cmd[F_SECT_PER_TRACK];
2166 if (!raw_cmd->cmd[F_SECT_PER_TRACK])
2169 /* allow for about 30ms for data transport per track */
2170 head_shift = (raw_cmd->cmd[F_SECT_PER_TRACK] + 5) / 6;
2172 /* a ``cylinder'' is two tracks plus a little stepping time */
2173 track_shift = 2 * head_shift + 3;
2175 /* position of logical sector 1 on this track */
2176 n = (track_shift * format_req.track + head_shift * format_req.head)
2177 % raw_cmd->cmd[F_SECT_PER_TRACK];
2179 /* determine interleave */
2181 if (_floppy->fmt_gap < 0x22)
2184 /* initialize field */
2185 for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) {
2186 here[count].track = format_req.track;
2187 here[count].head = format_req.head;
2188 here[count].sect = 0;
2189 here[count].size = raw_cmd->cmd[F_SIZECODE];
2191 /* place logical sectors */
2192 for (count = 1; count <= raw_cmd->cmd[F_SECT_PER_TRACK]; ++count) {
2193 here[n].sect = count;
2194 n = (n + il) % raw_cmd->cmd[F_SECT_PER_TRACK];
2195 if (here[n].sect) { /* sector busy, find next free sector */
2197 if (n >= raw_cmd->cmd[F_SECT_PER_TRACK]) {
2198 n -= raw_cmd->cmd[F_SECT_PER_TRACK];
2199 while (here[n].sect)
2204 if (_floppy->stretch & FD_SECTBASEMASK) {
2205 for (count = 0; count < raw_cmd->cmd[F_SECT_PER_TRACK]; count++)
2206 here[count].sect += FD_SECTBASE(_floppy) - 1;
2210 static void redo_format(void)
2213 setup_format_params(format_req.track << STRETCH(_floppy));
2215 debugt(__func__, "queue format request");
2218 static const struct cont_t format_cont = {
2219 .interrupt = format_interrupt,
2220 .redo = redo_format,
2221 .error = bad_flp_intr,
2222 .done = generic_done
2225 static int do_format(int drive, struct format_descr *tmp_format_req)
2229 if (lock_fdc(drive))
2234 _floppy->track > drive_params[current_drive].tracks ||
2235 tmp_format_req->track >= _floppy->track ||
2236 tmp_format_req->head >= _floppy->head ||
2237 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2238 !_floppy->fmt_gap) {
2239 process_fd_request();
2242 format_req = *tmp_format_req;
2244 cont = &format_cont;
2245 errors = &format_errors;
2246 ret = wait_til_done(redo_format, true);
2249 process_fd_request();
2254 * Buffer read/write and support
2255 * =============================
2258 static void floppy_end_request(struct request *req, blk_status_t error)
2260 unsigned int nr_sectors = current_count_sectors;
2261 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2263 /* current_count_sectors can be zero if transfer failed */
2265 nr_sectors = blk_rq_cur_sectors(req);
2266 if (blk_update_request(req, error, nr_sectors << 9))
2268 __blk_mq_end_request(req, error);
2270 /* We're done with the request */
2275 /* new request_done. Can handle physical sectors which are smaller than a
2277 static void request_done(int uptodate)
2279 struct request *req = current_req;
2281 char msg[sizeof("request done ") + sizeof(int) * 3];
2284 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2285 reschedule_timeout(MAXTIMEOUT, msg);
2288 pr_info("floppy.c: no request in request_done\n");
2293 /* maintain values for invalidation on geometry
2295 block = current_count_sectors + blk_rq_pos(req);
2296 INFBOUND(drive_state[current_drive].maxblock, block);
2297 if (block > _floppy->sect)
2298 drive_state[current_drive].maxtrack = 1;
2300 floppy_end_request(req, 0);
2302 if (rq_data_dir(req) == WRITE) {
2303 /* record write error information */
2304 write_errors[current_drive].write_errors++;
2305 if (write_errors[current_drive].write_errors == 1) {
2306 write_errors[current_drive].first_error_sector = blk_rq_pos(req);
2307 write_errors[current_drive].first_error_generation = drive_state[current_drive].generation;
2309 write_errors[current_drive].last_error_sector = blk_rq_pos(req);
2310 write_errors[current_drive].last_error_generation = drive_state[current_drive].generation;
2312 floppy_end_request(req, BLK_STS_IOERR);
2316 /* Interrupt handler evaluating the result of the r/w operation */
2317 static void rw_interrupt(void)
2324 if (reply_buffer[R_HEAD] >= 2) {
2325 /* some Toshiba floppy controllers occasionnally seem to
2326 * return bogus interrupts after read/write operations, which
2327 * can be recognized by a bad head number (>= 2) */
2331 if (!drive_state[current_drive].first_read_date)
2332 drive_state[current_drive].first_read_date = jiffies;
2335 ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4);
2337 if (reply_buffer[ST1] & ST1_EOC)
2342 if (raw_cmd->cmd[COMMAND] & 0x80)
2347 nr_sectors = (((reply_buffer[R_TRACK] - raw_cmd->cmd[TRACK]) * heads +
2348 reply_buffer[R_HEAD] - raw_cmd->cmd[HEAD]) * raw_cmd->cmd[SECT_PER_TRACK] +
2349 reply_buffer[R_SECTOR] - raw_cmd->cmd[SECTOR] + eoc) << raw_cmd->cmd[SIZECODE] >> 2;
2351 if (nr_sectors / ssize >
2352 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2353 DPRINT("long rw: %x instead of %lx\n",
2354 nr_sectors, current_count_sectors);
2355 pr_info("rs=%d s=%d\n", reply_buffer[R_SECTOR],
2356 raw_cmd->cmd[SECTOR]);
2357 pr_info("rh=%d h=%d\n", reply_buffer[R_HEAD],
2358 raw_cmd->cmd[HEAD]);
2359 pr_info("rt=%d t=%d\n", reply_buffer[R_TRACK],
2360 raw_cmd->cmd[TRACK]);
2361 pr_info("heads=%d eoc=%d\n", heads, eoc);
2362 pr_info("spt=%d st=%d ss=%d\n",
2363 raw_cmd->cmd[SECT_PER_TRACK], fsector_t, ssize);
2364 pr_info("in_sector_offset=%d\n", in_sector_offset);
2367 nr_sectors -= in_sector_offset;
2368 INFBOUND(nr_sectors, 0);
2369 SUPBOUND(current_count_sectors, nr_sectors);
2371 switch (interpret_errors()) {
2376 if (!current_count_sectors) {
2383 if (!current_count_sectors) {
2387 current_type[current_drive] = _floppy;
2388 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2393 if (drive_params[current_drive].flags & FTD_MSG)
2394 DPRINT("Auto-detected floppy type %s in fd%d\n",
2395 _floppy->name, current_drive);
2396 current_type[current_drive] = _floppy;
2397 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2401 if (CT(raw_cmd->cmd[COMMAND]) != FD_READ ||
2402 raw_cmd->kernel_data == bio_data(current_req->bio)) {
2403 /* transfer directly from buffer */
2405 } else if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) {
2406 buffer_track = raw_cmd->track;
2407 buffer_drive = current_drive;
2408 INFBOUND(buffer_max, nr_sectors + fsector_t);
2413 /* Compute maximal contiguous buffer size. */
2414 static int buffer_chain_size(void)
2418 struct req_iterator iter;
2421 base = bio_data(current_req->bio);
2424 rq_for_each_segment(bv, current_req, iter) {
2425 if (page_address(bv.bv_page) + bv.bv_offset != base + size)
2434 /* Compute the maximal transfer size */
2435 static int transfer_size(int ssize, int max_sector, int max_size)
2437 SUPBOUND(max_sector, fsector_t + max_size);
2440 max_sector -= (max_sector % _floppy->sect) % ssize;
2442 /* transfer size, beginning not aligned */
2443 current_count_sectors = max_sector - fsector_t;
2449 * Move data from/to the track buffer to/from the buffer cache.
2451 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2453 int remaining; /* number of transferred 512-byte sectors */
2458 struct req_iterator iter;
2460 max_sector = transfer_size(ssize,
2461 min(max_sector, max_sector_2),
2462 blk_rq_sectors(current_req));
2464 if (current_count_sectors <= 0 && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE &&
2465 buffer_max > fsector_t + blk_rq_sectors(current_req))
2466 current_count_sectors = min_t(int, buffer_max - fsector_t,
2467 blk_rq_sectors(current_req));
2469 remaining = current_count_sectors << 9;
2470 if (remaining > blk_rq_bytes(current_req) && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2471 DPRINT("in copy buffer\n");
2472 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2473 pr_info("remaining=%d\n", remaining >> 9);
2474 pr_info("current_req->nr_sectors=%u\n",
2475 blk_rq_sectors(current_req));
2476 pr_info("current_req->current_nr_sectors=%u\n",
2477 blk_rq_cur_sectors(current_req));
2478 pr_info("max_sector=%d\n", max_sector);
2479 pr_info("ssize=%d\n", ssize);
2482 buffer_max = max(max_sector, buffer_max);
2484 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2486 size = blk_rq_cur_bytes(current_req);
2488 rq_for_each_segment(bv, current_req, iter) {
2493 SUPBOUND(size, remaining);
2495 buffer = page_address(bv.bv_page) + bv.bv_offset;
2496 if (dma_buffer + size >
2497 floppy_track_buffer + (max_buffer_sectors << 10) ||
2498 dma_buffer < floppy_track_buffer) {
2499 DPRINT("buffer overrun in copy buffer %d\n",
2500 (int)((floppy_track_buffer - dma_buffer) >> 9));
2501 pr_info("fsector_t=%d buffer_min=%d\n",
2502 fsector_t, buffer_min);
2503 pr_info("current_count_sectors=%ld\n",
2504 current_count_sectors);
2505 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
2507 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE)
2511 if (((unsigned long)buffer) % 512)
2512 DPRINT("%p buffer not aligned\n", buffer);
2514 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
2515 memcpy(buffer, dma_buffer, size);
2517 memcpy(dma_buffer, buffer, size);
2524 max_sector -= remaining >> 9;
2525 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2529 /* work around a bug in pseudo DMA
2530 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2531 * sending data. Hence we need a different way to signal the
2532 * transfer length: We use raw_cmd->cmd[SECT_PER_TRACK]. Unfortunately, this
2533 * does not work with MT, hence we can only transfer one head at
2536 static void virtualdmabug_workaround(void)
2541 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2542 raw_cmd->cmd[COMMAND] &= ~0x80; /* switch off multiple track mode */
2544 hard_sectors = raw_cmd->length >> (7 + raw_cmd->cmd[SIZECODE]);
2545 end_sector = raw_cmd->cmd[SECTOR] + hard_sectors - 1;
2546 if (end_sector > raw_cmd->cmd[SECT_PER_TRACK]) {
2547 pr_info("too many sectors %d > %d\n",
2548 end_sector, raw_cmd->cmd[SECT_PER_TRACK]);
2551 raw_cmd->cmd[SECT_PER_TRACK] = end_sector;
2552 /* make sure raw_cmd->cmd[SECT_PER_TRACK]
2553 * points to end of transfer */
2558 * Formulate a read/write request.
2559 * this routine decides where to load the data (directly to buffer, or to
2560 * tmp floppy area), how much data to load (the size of the buffer, the whole
2561 * track, or a single sector)
2562 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2563 * allocation on the fly, it should be done here. No other part should need
2567 static int make_raw_rw_request(void)
2569 int aligned_sector_t;
2575 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2578 set_fdc((long)current_req->rq_disk->private_data);
2580 raw_cmd = &default_raw_cmd;
2581 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2582 raw_cmd->cmd_count = NR_RW;
2583 if (rq_data_dir(current_req) == READ) {
2584 raw_cmd->flags |= FD_RAW_READ;
2585 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ);
2586 } else if (rq_data_dir(current_req) == WRITE) {
2587 raw_cmd->flags |= FD_RAW_WRITE;
2588 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_WRITE);
2590 DPRINT("%s: unknown command\n", __func__);
2594 max_sector = _floppy->sect * _floppy->head;
2596 raw_cmd->cmd[TRACK] = (int)blk_rq_pos(current_req) / max_sector;
2597 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2598 if (_floppy->track && raw_cmd->cmd[TRACK] >= _floppy->track) {
2599 if (blk_rq_cur_sectors(current_req) & 1) {
2600 current_count_sectors = 1;
2605 raw_cmd->cmd[HEAD] = fsector_t / _floppy->sect;
2607 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2608 test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags)) &&
2609 fsector_t < _floppy->sect)
2610 max_sector = _floppy->sect;
2612 /* 2M disks have phantom sectors on the first track */
2613 if ((_floppy->rate & FD_2M) && (!raw_cmd->cmd[TRACK]) && (!raw_cmd->cmd[HEAD])) {
2614 max_sector = 2 * _floppy->sect / 3;
2615 if (fsector_t >= max_sector) {
2616 current_count_sectors =
2617 min_t(int, _floppy->sect - fsector_t,
2618 blk_rq_sectors(current_req));
2621 raw_cmd->cmd[SIZECODE] = 2;
2623 raw_cmd->cmd[SIZECODE] = FD_SIZECODE(_floppy);
2624 raw_cmd->rate = _floppy->rate & 0x43;
2625 if ((_floppy->rate & FD_2M) &&
2626 (raw_cmd->cmd[TRACK] || raw_cmd->cmd[HEAD]) && raw_cmd->rate == 2)
2629 if (raw_cmd->cmd[SIZECODE])
2630 raw_cmd->cmd[SIZECODE2] = 0xff;
2632 raw_cmd->cmd[SIZECODE2] = 0x80;
2633 raw_cmd->track = raw_cmd->cmd[TRACK] << STRETCH(_floppy);
2634 raw_cmd->cmd[DR_SELECT] = UNIT(current_drive) + PH_HEAD(_floppy, raw_cmd->cmd[HEAD]);
2635 raw_cmd->cmd[GAP] = _floppy->gap;
2636 ssize = DIV_ROUND_UP(1 << raw_cmd->cmd[SIZECODE], 4);
2637 raw_cmd->cmd[SECT_PER_TRACK] = _floppy->sect << 2 >> raw_cmd->cmd[SIZECODE];
2638 raw_cmd->cmd[SECTOR] = ((fsector_t % _floppy->sect) << 2 >> raw_cmd->cmd[SIZECODE]) +
2639 FD_SECTBASE(_floppy);
2641 /* tracksize describes the size which can be filled up with sectors
2644 tracksize = _floppy->sect - _floppy->sect % ssize;
2645 if (tracksize < _floppy->sect) {
2646 raw_cmd->cmd[SECT_PER_TRACK]++;
2647 if (tracksize <= fsector_t % _floppy->sect)
2648 raw_cmd->cmd[SECTOR]--;
2650 /* if we are beyond tracksize, fill up using smaller sectors */
2651 while (tracksize <= fsector_t % _floppy->sect) {
2652 while (tracksize + ssize > _floppy->sect) {
2653 raw_cmd->cmd[SIZECODE]--;
2656 raw_cmd->cmd[SECTOR]++;
2657 raw_cmd->cmd[SECT_PER_TRACK]++;
2660 max_sector = raw_cmd->cmd[HEAD] * _floppy->sect + tracksize;
2661 } else if (!raw_cmd->cmd[TRACK] && !raw_cmd->cmd[HEAD] && !(_floppy->rate & FD_2M) && probing) {
2662 max_sector = _floppy->sect;
2663 } else if (!raw_cmd->cmd[HEAD] && CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2664 /* for virtual DMA bug workaround */
2665 max_sector = _floppy->sect;
2668 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2669 aligned_sector_t = fsector_t - in_sector_offset;
2670 max_size = blk_rq_sectors(current_req);
2671 if ((raw_cmd->track == buffer_track) &&
2672 (current_drive == buffer_drive) &&
2673 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2674 /* data already in track buffer */
2675 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ) {
2676 copy_buffer(1, max_sector, buffer_max);
2679 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2680 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2681 unsigned int sectors;
2683 sectors = fsector_t + blk_rq_sectors(current_req);
2684 if (sectors > ssize && sectors < ssize + ssize)
2685 max_size = ssize + ssize;
2689 raw_cmd->flags &= ~FD_RAW_WRITE;
2690 raw_cmd->flags |= FD_RAW_READ;
2691 raw_cmd->cmd[COMMAND] = FM_MODE(_floppy, FD_READ);
2692 } else if ((unsigned long)bio_data(current_req->bio) < MAX_DMA_ADDRESS) {
2693 unsigned long dma_limit;
2694 int direct, indirect;
2697 transfer_size(ssize, max_sector,
2698 max_buffer_sectors * 2) - fsector_t;
2701 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2702 * on a 64 bit machine!
2704 max_size = buffer_chain_size();
2705 dma_limit = (MAX_DMA_ADDRESS -
2706 ((unsigned long)bio_data(current_req->bio))) >> 9;
2707 if ((unsigned long)max_size > dma_limit)
2708 max_size = dma_limit;
2709 /* 64 kb boundaries */
2710 if (CROSS_64KB(bio_data(current_req->bio), max_size << 9))
2712 ((unsigned long)bio_data(current_req->bio)) %
2714 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2716 * We try to read tracks, but if we get too many errors, we
2717 * go back to reading just one sector at a time.
2719 * This means we should be able to read a sector even if there
2720 * are other bad sectors on this track.
2723 (indirect * 2 > direct * 3 &&
2724 *errors < drive_params[current_drive].max_errors.read_track &&
2726 (drive_params[current_drive].read_track & (1 << drive_state[current_drive].probed_format)))))) {
2727 max_size = blk_rq_sectors(current_req);
2729 raw_cmd->kernel_data = bio_data(current_req->bio);
2730 raw_cmd->length = current_count_sectors << 9;
2731 if (raw_cmd->length == 0) {
2732 DPRINT("%s: zero dma transfer attempted\n", __func__);
2733 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2734 indirect, direct, fsector_t);
2737 virtualdmabug_workaround();
2742 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
2743 max_size = max_sector; /* unbounded */
2745 /* claim buffer track if needed */
2746 if (buffer_track != raw_cmd->track || /* bad track */
2747 buffer_drive != current_drive || /* bad drive */
2748 fsector_t > buffer_max ||
2749 fsector_t < buffer_min ||
2750 ((CT(raw_cmd->cmd[COMMAND]) == FD_READ ||
2751 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2752 max_sector > 2 * max_buffer_sectors + buffer_min &&
2753 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2754 /* not enough space */
2756 buffer_drive = current_drive;
2757 buffer_max = buffer_min = aligned_sector_t;
2759 raw_cmd->kernel_data = floppy_track_buffer +
2760 ((aligned_sector_t - buffer_min) << 9);
2762 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE) {
2763 /* copy write buffer to track buffer.
2764 * if we get here, we know that the write
2765 * is either aligned or the data already in the buffer
2766 * (buffer will be overwritten) */
2767 if (in_sector_offset && buffer_track == -1)
2768 DPRINT("internal error offset !=0 on write\n");
2769 buffer_track = raw_cmd->track;
2770 buffer_drive = current_drive;
2771 copy_buffer(ssize, max_sector,
2772 2 * max_buffer_sectors + buffer_min);
2774 transfer_size(ssize, max_sector,
2775 2 * max_buffer_sectors + buffer_min -
2778 /* round up current_count_sectors to get dma xfer size */
2779 raw_cmd->length = in_sector_offset + current_count_sectors;
2780 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2781 raw_cmd->length <<= 9;
2782 if ((raw_cmd->length < current_count_sectors << 9) ||
2783 (raw_cmd->kernel_data != bio_data(current_req->bio) &&
2784 CT(raw_cmd->cmd[COMMAND]) == FD_WRITE &&
2785 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2786 aligned_sector_t < buffer_min)) ||
2787 raw_cmd->length % (128 << raw_cmd->cmd[SIZECODE]) ||
2788 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2789 DPRINT("fractionary current count b=%lx s=%lx\n",
2790 raw_cmd->length, current_count_sectors);
2791 if (raw_cmd->kernel_data != bio_data(current_req->bio))
2792 pr_info("addr=%d, length=%ld\n",
2793 (int)((raw_cmd->kernel_data -
2794 floppy_track_buffer) >> 9),
2795 current_count_sectors);
2796 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2797 fsector_t, aligned_sector_t, max_sector, max_size);
2798 pr_info("ssize=%x SIZECODE=%d\n", ssize, raw_cmd->cmd[SIZECODE]);
2799 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2800 raw_cmd->cmd[COMMAND], raw_cmd->cmd[SECTOR],
2801 raw_cmd->cmd[HEAD], raw_cmd->cmd[TRACK]);
2802 pr_info("buffer drive=%d\n", buffer_drive);
2803 pr_info("buffer track=%d\n", buffer_track);
2804 pr_info("buffer_min=%d\n", buffer_min);
2805 pr_info("buffer_max=%d\n", buffer_max);
2809 if (raw_cmd->kernel_data != bio_data(current_req->bio)) {
2810 if (raw_cmd->kernel_data < floppy_track_buffer ||
2811 current_count_sectors < 0 ||
2812 raw_cmd->length < 0 ||
2813 raw_cmd->kernel_data + raw_cmd->length >
2814 floppy_track_buffer + (max_buffer_sectors << 10)) {
2815 DPRINT("buffer overrun in schedule dma\n");
2816 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2817 fsector_t, buffer_min, raw_cmd->length >> 9);
2818 pr_info("current_count_sectors=%ld\n",
2819 current_count_sectors);
2820 if (CT(raw_cmd->cmd[COMMAND]) == FD_READ)
2822 if (CT(raw_cmd->cmd[COMMAND]) == FD_WRITE)
2826 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2827 current_count_sectors > blk_rq_sectors(current_req)) {
2828 DPRINT("buffer overrun in direct transfer\n");
2830 } else if (raw_cmd->length < current_count_sectors << 9) {
2831 DPRINT("more sectors than bytes\n");
2832 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2833 pr_info("sectors=%ld\n", current_count_sectors);
2835 if (raw_cmd->length == 0) {
2836 DPRINT("zero dma transfer attempted from make_raw_request\n");
2840 virtualdmabug_workaround();
2844 static int set_next_request(void)
2846 current_req = list_first_entry_or_null(&floppy_reqs, struct request,
2849 current_req->error_count = 0;
2850 list_del_init(¤t_req->queuelist);
2852 return current_req != NULL;
2855 /* Starts or continues processing request. Will automatically unlock the
2856 * driver at end of request.
2858 static void redo_fd_request(void)
2864 if (current_drive < N_DRIVE)
2865 floppy_off(current_drive);
2871 spin_lock_irq(&floppy_lock);
2872 pending = set_next_request();
2873 spin_unlock_irq(&floppy_lock);
2880 drive = (long)current_req->rq_disk->private_data;
2882 reschedule_timeout(current_drive, "redo fd request");
2885 raw_cmd = &default_raw_cmd;
2887 if (start_motor(redo_fd_request))
2890 disk_change(current_drive);
2891 if (test_bit(current_drive, &fake_change) ||
2892 test_bit(FD_DISK_CHANGED_BIT, &drive_state[current_drive].flags)) {
2893 DPRINT("disk absent or changed during operation\n");
2897 if (!_floppy) { /* Autodetection */
2899 drive_state[current_drive].probed_format = 0;
2900 if (next_valid_format(current_drive)) {
2901 DPRINT("no autodetectable formats\n");
2908 _floppy = floppy_type + drive_params[current_drive].autodetect[drive_state[current_drive].probed_format];
2911 errors = &(current_req->error_count);
2912 tmp = make_raw_rw_request();
2918 if (test_bit(FD_NEED_TWADDLE_BIT, &drive_state[current_drive].flags))
2919 twaddle(current_fdc, current_drive);
2920 schedule_bh(floppy_start);
2921 debugt(__func__, "queue fd request");
2925 static const struct cont_t rw_cont = {
2926 .interrupt = rw_interrupt,
2927 .redo = redo_fd_request,
2928 .error = bad_flp_intr,
2929 .done = request_done
2932 /* schedule the request and automatically unlock the driver on completion */
2933 static void process_fd_request(void)
2936 schedule_bh(redo_fd_request);
2939 static blk_status_t floppy_queue_rq(struct blk_mq_hw_ctx *hctx,
2940 const struct blk_mq_queue_data *bd)
2942 blk_mq_start_request(bd->rq);
2944 if (WARN(max_buffer_sectors == 0,
2945 "VFS: %s called on non-open device\n", __func__))
2946 return BLK_STS_IOERR;
2948 if (WARN(atomic_read(&usage_count) == 0,
2949 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n",
2950 current_req, (long)blk_rq_pos(current_req),
2951 (unsigned long long) current_req->cmd_flags))
2952 return BLK_STS_IOERR;
2954 if (test_and_set_bit(0, &fdc_busy)) {
2955 /* fdc busy, this new request will be treated when the
2956 current one is done */
2957 is_alive(__func__, "old request running");
2958 return BLK_STS_RESOURCE;
2961 spin_lock_irq(&floppy_lock);
2962 list_add_tail(&bd->rq->queuelist, &floppy_reqs);
2963 spin_unlock_irq(&floppy_lock);
2965 command_status = FD_COMMAND_NONE;
2966 __reschedule_timeout(MAXTIMEOUT, "fd_request");
2968 process_fd_request();
2969 is_alive(__func__, "");
2973 static const struct cont_t poll_cont = {
2974 .interrupt = success_and_wakeup,
2975 .redo = floppy_ready,
2976 .error = generic_failure,
2977 .done = generic_done
2980 static int poll_drive(bool interruptible, int flag)
2982 /* no auto-sense, just clear dcl */
2983 raw_cmd = &default_raw_cmd;
2984 raw_cmd->flags = flag;
2986 raw_cmd->cmd_count = 0;
2988 debug_dcl(drive_params[current_drive].flags,
2989 "setting NEWCHANGE in poll_drive\n");
2990 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[current_drive].flags);
2992 return wait_til_done(floppy_ready, interruptible);
2996 * User triggered reset
2997 * ====================
3000 static void reset_intr(void)
3002 pr_info("weird, reset interrupt called\n");
3005 static const struct cont_t reset_cont = {
3006 .interrupt = reset_intr,
3007 .redo = success_and_wakeup,
3008 .error = generic_failure,
3009 .done = generic_done
3013 * Resets the FDC connected to drive <drive>.
3014 * Both current_drive and current_fdc are changed to match the new drive.
3016 static int user_reset_fdc(int drive, int arg, bool interruptible)
3020 if (lock_fdc(drive))
3023 if (arg == FD_RESET_ALWAYS)
3024 fdc_state[current_fdc].reset = 1;
3025 if (fdc_state[current_fdc].reset) {
3026 /* note: reset_fdc will take care of unlocking the driver
3030 ret = wait_til_done(reset_fdc, interruptible);
3034 process_fd_request();
3039 * Misc Ioctl's and support
3040 * ========================
3042 static inline int fd_copyout(void __user *param, const void *address,
3045 return copy_to_user(param, address, size) ? -EFAULT : 0;
3048 static inline int fd_copyin(void __user *param, void *address,
3051 return copy_from_user(address, param, size) ? -EFAULT : 0;
3054 static const char *drive_name(int type, int drive)
3056 struct floppy_struct *floppy;
3059 floppy = floppy_type + type;
3061 if (drive_params[drive].native_format)
3062 floppy = floppy_type + drive_params[drive].native_format;
3067 return floppy->name;
3073 static void raw_cmd_done(int flag)
3078 raw_cmd->flags |= FD_RAW_FAILURE;
3079 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3081 raw_cmd->reply_count = inr;
3082 if (raw_cmd->reply_count > FD_RAW_REPLY_SIZE)
3083 raw_cmd->reply_count = 0;
3084 for (i = 0; i < raw_cmd->reply_count; i++)
3085 raw_cmd->reply[i] = reply_buffer[i];
3087 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3088 unsigned long flags;
3089 flags = claim_dma_lock();
3090 raw_cmd->length = fd_get_dma_residue();
3091 release_dma_lock(flags);
3094 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3095 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3096 raw_cmd->flags |= FD_RAW_FAILURE;
3098 if (disk_change(current_drive))
3099 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3101 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3102 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3103 motor_off_callback(&motor_off_timer[current_drive]);
3105 if (raw_cmd->next &&
3106 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3107 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3108 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3109 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3110 raw_cmd = raw_cmd->next;
3117 static const struct cont_t raw_cmd_cont = {
3118 .interrupt = success_and_wakeup,
3119 .redo = floppy_start,
3120 .error = generic_failure,
3121 .done = raw_cmd_done
3124 static int raw_cmd_copyout(int cmd, void __user *param,
3125 struct floppy_raw_cmd *ptr)
3130 struct floppy_raw_cmd cmd = *ptr;
3132 cmd.kernel_data = NULL;
3133 ret = copy_to_user(param, &cmd, sizeof(cmd));
3136 param += sizeof(struct floppy_raw_cmd);
3137 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3138 if (ptr->length >= 0 &&
3139 ptr->length <= ptr->buffer_length) {
3140 long length = ptr->buffer_length - ptr->length;
3141 ret = fd_copyout(ptr->data, ptr->kernel_data,
3153 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3155 struct floppy_raw_cmd *next;
3156 struct floppy_raw_cmd *this;
3161 if (this->buffer_length) {
3162 fd_dma_mem_free((unsigned long)this->kernel_data,
3163 this->buffer_length);
3164 this->buffer_length = 0;
3172 static int raw_cmd_copyin(int cmd, void __user *param,
3173 struct floppy_raw_cmd **rcmd)
3175 struct floppy_raw_cmd *ptr;
3182 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL);
3186 ret = copy_from_user(ptr, param, sizeof(*ptr));
3188 ptr->buffer_length = 0;
3189 ptr->kernel_data = NULL;
3192 param += sizeof(struct floppy_raw_cmd);
3193 if (ptr->cmd_count > FD_RAW_CMD_FULLSIZE)
3196 for (i = 0; i < FD_RAW_REPLY_SIZE; i++)
3198 ptr->resultcode = 0;
3200 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3201 if (ptr->length <= 0)
3203 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3204 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3205 if (!ptr->kernel_data)
3207 ptr->buffer_length = ptr->length;
3209 if (ptr->flags & FD_RAW_WRITE) {
3210 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3215 if (ptr->flags & FD_RAW_MORE) {
3216 rcmd = &(ptr->next);
3224 static int raw_cmd_ioctl(int cmd, void __user *param)
3226 struct floppy_raw_cmd *my_raw_cmd;
3231 if (fdc_state[current_fdc].rawcmd <= 1)
3232 fdc_state[current_fdc].rawcmd = 1;
3233 for (drive = 0; drive < N_DRIVE; drive++) {
3234 if (FDC(drive) != current_fdc)
3236 if (drive == current_drive) {
3237 if (drive_state[drive].fd_ref > 1) {
3238 fdc_state[current_fdc].rawcmd = 2;
3241 } else if (drive_state[drive].fd_ref) {
3242 fdc_state[current_fdc].rawcmd = 2;
3247 if (fdc_state[current_fdc].reset)
3250 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3252 raw_cmd_free(&my_raw_cmd);
3256 raw_cmd = my_raw_cmd;
3257 cont = &raw_cmd_cont;
3258 ret = wait_til_done(floppy_start, true);
3259 debug_dcl(drive_params[current_drive].flags,
3260 "calling disk change from raw_cmd ioctl\n");
3262 if (ret != -EINTR && fdc_state[current_fdc].reset)
3265 drive_state[current_drive].track = NO_TRACK;
3267 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3270 raw_cmd_free(&my_raw_cmd);
3274 static int invalidate_drive(struct block_device *bdev)
3276 /* invalidate the buffer track to force a reread */
3277 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3278 process_fd_request();
3279 if (bdev_check_media_change(bdev))
3280 floppy_revalidate(bdev->bd_disk);
3284 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3285 int drive, int type, struct block_device *bdev)
3289 /* sanity checking for parameters. */
3290 if ((int)g->sect <= 0 ||
3291 (int)g->head <= 0 ||
3292 /* check for overflow in max_sector */
3293 (int)(g->sect * g->head) <= 0 ||
3294 /* check for zero in raw_cmd->cmd[F_SECT_PER_TRACK] */
3295 (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 ||
3296 g->track <= 0 || g->track > drive_params[drive].tracks >> STRETCH(g) ||
3297 /* check if reserved bits are set */
3298 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3301 if (!capable(CAP_SYS_ADMIN))
3303 mutex_lock(&open_lock);
3304 if (lock_fdc(drive)) {
3305 mutex_unlock(&open_lock);
3308 floppy_type[type] = *g;
3309 floppy_type[type].name = "user format";
3310 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3311 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3312 floppy_type[type].size + 1;
3313 process_fd_request();
3314 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3315 struct block_device *bdev = opened_bdev[cnt];
3316 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3318 __invalidate_device(bdev, true);
3320 mutex_unlock(&open_lock);
3324 if (lock_fdc(drive))
3326 if (cmd != FDDEFPRM) {
3327 /* notice a disk change immediately, else
3328 * we lose our settings immediately*/
3329 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3332 oldStretch = g->stretch;
3333 user_params[drive] = *g;
3334 if (buffer_drive == drive)
3335 SUPBOUND(buffer_max, user_params[drive].sect);
3336 current_type[drive] = &user_params[drive];
3337 floppy_sizes[drive] = user_params[drive].size;
3338 if (cmd == FDDEFPRM)
3339 drive_state[current_drive].keep_data = -1;
3341 drive_state[current_drive].keep_data = 1;
3342 /* invalidation. Invalidate only when needed, i.e.
3343 * when there are already sectors in the buffer cache
3344 * whose number will change. This is useful, because
3345 * mtools often changes the geometry of the disk after
3346 * looking at the boot block */
3347 if (drive_state[current_drive].maxblock > user_params[drive].sect ||
3348 drive_state[current_drive].maxtrack ||
3349 ((user_params[drive].sect ^ oldStretch) &
3350 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3351 invalidate_drive(bdev);
3353 process_fd_request();
3358 /* handle obsolete ioctl's */
3359 static unsigned int ioctl_table[] = {
3387 static int normalize_ioctl(unsigned int *cmd, int *size)
3391 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3392 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3393 *size = _IOC_SIZE(*cmd);
3394 *cmd = ioctl_table[i];
3395 if (*size > _IOC_SIZE(*cmd)) {
3396 pr_info("ioctl not yet supported\n");
3405 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3408 *g = &floppy_type[type];
3410 if (lock_fdc(drive))
3412 if (poll_drive(false, 0) == -EINTR)
3414 process_fd_request();
3415 *g = current_type[drive];
3422 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3424 int drive = (long)bdev->bd_disk->private_data;
3425 int type = ITYPE(drive_state[drive].fd_device);
3426 struct floppy_struct *g;
3429 ret = get_floppy_geometry(drive, type, &g);
3433 geo->heads = g->head;
3434 geo->sectors = g->sect;
3435 geo->cylinders = g->track;
3439 static bool valid_floppy_drive_params(const short autodetect[FD_AUTODETECT_SIZE],
3442 size_t floppy_type_size = ARRAY_SIZE(floppy_type);
3445 for (i = 0; i < FD_AUTODETECT_SIZE; ++i) {
3446 if (autodetect[i] < 0 ||
3447 autodetect[i] >= floppy_type_size)
3451 if (native_format < 0 || native_format >= floppy_type_size)
3457 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3458 unsigned long param)
3460 int drive = (long)bdev->bd_disk->private_data;
3461 int type = ITYPE(drive_state[drive].fd_device);
3466 struct floppy_struct g; /* geometry */
3467 struct format_descr f;
3468 struct floppy_max_errors max_errors;
3469 struct floppy_drive_params dp;
3470 } inparam; /* parameters coming from user space */
3471 const void *outparam; /* parameters passed back to user space */
3473 /* convert compatibility eject ioctls into floppy eject ioctl.
3474 * We do this in order to provide a means to eject floppy disks before
3475 * installing the new fdutils package */
3476 if (cmd == CDROMEJECT || /* CD-ROM eject */
3477 cmd == 0x6470) { /* SunOS floppy eject */
3478 DPRINT("obsolete eject ioctl\n");
3479 DPRINT("please use floppycontrol --eject\n");
3483 if (!((cmd & 0xff00) == 0x0200))
3486 /* convert the old style command into a new style command */
3487 ret = normalize_ioctl(&cmd, &size);
3491 /* permission checks */
3492 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3493 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3496 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3500 memset(&inparam, 0, sizeof(inparam));
3501 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3502 ret = fd_copyin((void __user *)param, &inparam, size);
3509 if (drive_state[drive].fd_ref != 1)
3510 /* somebody else has this drive open */
3512 if (lock_fdc(drive))
3515 /* do the actual eject. Fails on
3516 * non-Sparc architectures */
3517 ret = fd_eject(UNIT(drive));
3519 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
3520 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
3521 process_fd_request();
3524 if (lock_fdc(drive))
3526 current_type[drive] = NULL;
3527 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3528 drive_state[drive].keep_data = 0;
3529 return invalidate_drive(bdev);
3532 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3534 ret = get_floppy_geometry(drive, type,
3535 (struct floppy_struct **)&outparam);
3538 memcpy(&inparam.g, outparam,
3539 offsetof(struct floppy_struct, name));
3540 outparam = &inparam.g;
3543 drive_params[drive].flags |= FTD_MSG;
3546 drive_params[drive].flags &= ~FTD_MSG;
3549 if (lock_fdc(drive))
3551 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3553 ret = drive_state[drive].flags;
3554 process_fd_request();
3555 if (ret & FD_VERIFY)
3557 if (!(ret & FD_DISK_WRITABLE))
3561 if (drive_state[drive].fd_ref != 1)
3563 return do_format(drive, &inparam.f);
3566 if (lock_fdc(drive))
3568 return invalidate_drive(bdev);
3569 case FDSETEMSGTRESH:
3570 drive_params[drive].max_errors.reporting = (unsigned short)(param & 0x0f);
3573 outparam = &drive_params[drive].max_errors;
3576 drive_params[drive].max_errors = inparam.max_errors;
3579 outparam = drive_name(type, drive);
3580 SUPBOUND(size, strlen((const char *)outparam) + 1);
3583 if (!valid_floppy_drive_params(inparam.dp.autodetect,
3584 inparam.dp.native_format))
3586 drive_params[drive] = inparam.dp;
3589 outparam = &drive_params[drive];
3592 if (lock_fdc(drive))
3594 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3596 process_fd_request();
3599 outparam = &drive_state[drive];
3602 return user_reset_fdc(drive, (int)param, true);
3604 outparam = &fdc_state[FDC(drive)];
3607 memset(&write_errors[drive], 0, sizeof(write_errors[drive]));
3610 outparam = &write_errors[drive];
3615 if (lock_fdc(drive))
3618 i = raw_cmd_ioctl(cmd, (void __user *)param);
3621 process_fd_request();
3624 if (lock_fdc(drive))
3626 twaddle(current_fdc, current_drive);
3627 process_fd_request();
3633 if (_IOC_DIR(cmd) & _IOC_READ)
3634 return fd_copyout((void __user *)param, outparam, size);
3639 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3640 unsigned int cmd, unsigned long param)
3644 mutex_lock(&floppy_mutex);
3645 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3646 mutex_unlock(&floppy_mutex);
3651 #ifdef CONFIG_COMPAT
3653 struct compat_floppy_drive_params {
3655 compat_ulong_t max_dtr;
3659 compat_ulong_t spinup;
3660 compat_ulong_t spindown;
3661 unsigned char spindown_offset;
3662 unsigned char select_delay;
3664 unsigned char tracks;
3665 compat_ulong_t timeout;
3666 unsigned char interleave_sect;
3667 struct floppy_max_errors max_errors;
3670 short autodetect[FD_AUTODETECT_SIZE];
3671 compat_int_t checkfreq;
3672 compat_int_t native_format;
3675 struct compat_floppy_drive_struct {
3677 compat_ulong_t spinup_date;
3678 compat_ulong_t select_date;
3679 compat_ulong_t first_read_date;
3680 short probed_format;
3684 compat_int_t generation;
3685 compat_int_t keep_data;
3686 compat_int_t fd_ref;
3687 compat_int_t fd_device;
3688 compat_int_t last_checked;
3689 compat_caddr_t dmabuf;
3690 compat_int_t bufblocks;
3693 struct compat_floppy_fdc_state {
3697 unsigned char version;
3699 compat_ulong_t address;
3700 unsigned int rawcmd:2;
3701 unsigned int reset:1;
3702 unsigned int need_configure:1;
3703 unsigned int perp_mode:2;
3704 unsigned int has_fifo:1;
3705 unsigned int driver_version;
3706 unsigned char track[4];
3709 struct compat_floppy_write_errors {
3710 unsigned int write_errors;
3711 compat_ulong_t first_error_sector;
3712 compat_int_t first_error_generation;
3713 compat_ulong_t last_error_sector;
3714 compat_int_t last_error_generation;
3715 compat_uint_t badness;
3718 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
3719 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
3720 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
3721 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
3722 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
3723 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
3724 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
3725 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
3727 static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3728 struct compat_floppy_struct __user *arg)
3730 struct floppy_struct v;
3734 BUILD_BUG_ON(offsetof(struct floppy_struct, name) !=
3735 offsetof(struct compat_floppy_struct, name));
3737 if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL)))
3740 memset(&v, 0, sizeof(struct floppy_struct));
3741 if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name)))
3744 mutex_lock(&floppy_mutex);
3745 drive = (long)bdev->bd_disk->private_data;
3746 type = ITYPE(drive_state[drive].fd_device);
3747 err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM,
3748 &v, drive, type, bdev);
3749 mutex_unlock(&floppy_mutex);
3753 static int compat_get_prm(int drive,
3754 struct compat_floppy_struct __user *arg)
3756 struct compat_floppy_struct v;
3757 struct floppy_struct *p;
3760 memset(&v, 0, sizeof(v));
3761 mutex_lock(&floppy_mutex);
3762 err = get_floppy_geometry(drive, ITYPE(drive_state[drive].fd_device),
3765 mutex_unlock(&floppy_mutex);
3768 memcpy(&v, p, offsetof(struct floppy_struct, name));
3769 mutex_unlock(&floppy_mutex);
3770 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct)))
3775 static int compat_setdrvprm(int drive,
3776 struct compat_floppy_drive_params __user *arg)
3778 struct compat_floppy_drive_params v;
3780 if (!capable(CAP_SYS_ADMIN))
3782 if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params)))
3784 if (!valid_floppy_drive_params(v.autodetect, v.native_format))
3786 mutex_lock(&floppy_mutex);
3787 drive_params[drive].cmos = v.cmos;
3788 drive_params[drive].max_dtr = v.max_dtr;
3789 drive_params[drive].hlt = v.hlt;
3790 drive_params[drive].hut = v.hut;
3791 drive_params[drive].srt = v.srt;
3792 drive_params[drive].spinup = v.spinup;
3793 drive_params[drive].spindown = v.spindown;
3794 drive_params[drive].spindown_offset = v.spindown_offset;
3795 drive_params[drive].select_delay = v.select_delay;
3796 drive_params[drive].rps = v.rps;
3797 drive_params[drive].tracks = v.tracks;
3798 drive_params[drive].timeout = v.timeout;
3799 drive_params[drive].interleave_sect = v.interleave_sect;
3800 drive_params[drive].max_errors = v.max_errors;
3801 drive_params[drive].flags = v.flags;
3802 drive_params[drive].read_track = v.read_track;
3803 memcpy(drive_params[drive].autodetect, v.autodetect,
3804 sizeof(v.autodetect));
3805 drive_params[drive].checkfreq = v.checkfreq;
3806 drive_params[drive].native_format = v.native_format;
3807 mutex_unlock(&floppy_mutex);
3811 static int compat_getdrvprm(int drive,
3812 struct compat_floppy_drive_params __user *arg)
3814 struct compat_floppy_drive_params v;
3816 memset(&v, 0, sizeof(struct compat_floppy_drive_params));
3817 mutex_lock(&floppy_mutex);
3818 v.cmos = drive_params[drive].cmos;
3819 v.max_dtr = drive_params[drive].max_dtr;
3820 v.hlt = drive_params[drive].hlt;
3821 v.hut = drive_params[drive].hut;
3822 v.srt = drive_params[drive].srt;
3823 v.spinup = drive_params[drive].spinup;
3824 v.spindown = drive_params[drive].spindown;
3825 v.spindown_offset = drive_params[drive].spindown_offset;
3826 v.select_delay = drive_params[drive].select_delay;
3827 v.rps = drive_params[drive].rps;
3828 v.tracks = drive_params[drive].tracks;
3829 v.timeout = drive_params[drive].timeout;
3830 v.interleave_sect = drive_params[drive].interleave_sect;
3831 v.max_errors = drive_params[drive].max_errors;
3832 v.flags = drive_params[drive].flags;
3833 v.read_track = drive_params[drive].read_track;
3834 memcpy(v.autodetect, drive_params[drive].autodetect,
3835 sizeof(v.autodetect));
3836 v.checkfreq = drive_params[drive].checkfreq;
3837 v.native_format = drive_params[drive].native_format;
3838 mutex_unlock(&floppy_mutex);
3840 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
3845 static int compat_getdrvstat(int drive, bool poll,
3846 struct compat_floppy_drive_struct __user *arg)
3848 struct compat_floppy_drive_struct v;
3850 memset(&v, 0, sizeof(struct compat_floppy_drive_struct));
3851 mutex_lock(&floppy_mutex);
3854 if (lock_fdc(drive))
3856 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3858 process_fd_request();
3860 v.spinup_date = drive_state[drive].spinup_date;
3861 v.select_date = drive_state[drive].select_date;
3862 v.first_read_date = drive_state[drive].first_read_date;
3863 v.probed_format = drive_state[drive].probed_format;
3864 v.track = drive_state[drive].track;
3865 v.maxblock = drive_state[drive].maxblock;
3866 v.maxtrack = drive_state[drive].maxtrack;
3867 v.generation = drive_state[drive].generation;
3868 v.keep_data = drive_state[drive].keep_data;
3869 v.fd_ref = drive_state[drive].fd_ref;
3870 v.fd_device = drive_state[drive].fd_device;
3871 v.last_checked = drive_state[drive].last_checked;
3872 v.dmabuf = (uintptr_t) drive_state[drive].dmabuf;
3873 v.bufblocks = drive_state[drive].bufblocks;
3874 mutex_unlock(&floppy_mutex);
3876 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
3880 mutex_unlock(&floppy_mutex);
3884 static int compat_getfdcstat(int drive,
3885 struct compat_floppy_fdc_state __user *arg)
3887 struct compat_floppy_fdc_state v32;
3888 struct floppy_fdc_state v;
3890 mutex_lock(&floppy_mutex);
3891 v = fdc_state[FDC(drive)];
3892 mutex_unlock(&floppy_mutex);
3894 memset(&v32, 0, sizeof(struct compat_floppy_fdc_state));
3895 v32.spec1 = v.spec1;
3896 v32.spec2 = v.spec2;
3898 v32.version = v.version;
3900 v32.address = v.address;
3901 v32.rawcmd = v.rawcmd;
3902 v32.reset = v.reset;
3903 v32.need_configure = v.need_configure;
3904 v32.perp_mode = v.perp_mode;
3905 v32.has_fifo = v.has_fifo;
3906 v32.driver_version = v.driver_version;
3907 memcpy(v32.track, v.track, 4);
3908 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state)))
3913 static int compat_werrorget(int drive,
3914 struct compat_floppy_write_errors __user *arg)
3916 struct compat_floppy_write_errors v32;
3917 struct floppy_write_errors v;
3919 memset(&v32, 0, sizeof(struct compat_floppy_write_errors));
3920 mutex_lock(&floppy_mutex);
3921 v = write_errors[drive];
3922 mutex_unlock(&floppy_mutex);
3923 v32.write_errors = v.write_errors;
3924 v32.first_error_sector = v.first_error_sector;
3925 v32.first_error_generation = v.first_error_generation;
3926 v32.last_error_sector = v.last_error_sector;
3927 v32.last_error_generation = v.last_error_generation;
3928 v32.badness = v.badness;
3929 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors)))
3934 static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3935 unsigned long param)
3937 int drive = (long)bdev->bd_disk->private_data;
3939 case CDROMEJECT: /* CD-ROM eject */
3940 case 0x6470: /* SunOS floppy eject */
3944 case FDSETEMSGTRESH:
3952 return fd_ioctl(bdev, mode, cmd, param);
3959 return fd_ioctl(bdev, mode, cmd,
3960 (unsigned long)compat_ptr(param));
3963 return compat_set_geometry(bdev, mode, cmd, compat_ptr(param));
3965 return compat_get_prm(drive, compat_ptr(param));
3967 return compat_setdrvprm(drive, compat_ptr(param));
3969 return compat_getdrvprm(drive, compat_ptr(param));
3970 case FDPOLLDRVSTAT32:
3971 return compat_getdrvstat(drive, true, compat_ptr(param));
3972 case FDGETDRVSTAT32:
3973 return compat_getdrvstat(drive, false, compat_ptr(param));
3974 case FDGETFDCSTAT32:
3975 return compat_getfdcstat(drive, compat_ptr(param));
3977 return compat_werrorget(drive, compat_ptr(param));
3983 static void __init config_types(void)
3985 bool has_drive = false;
3988 /* read drive info out of physical CMOS */
3990 if (!drive_params[drive].cmos)
3991 drive_params[drive].cmos = FLOPPY0_TYPE;
3993 if (!drive_params[drive].cmos)
3994 drive_params[drive].cmos = FLOPPY1_TYPE;
3996 /* FIXME: additional physical CMOS drive detection should go here */
3998 for (drive = 0; drive < N_DRIVE; drive++) {
3999 unsigned int type = drive_params[drive].cmos;
4000 struct floppy_drive_params *params;
4001 const char *name = NULL;
4004 if (type < ARRAY_SIZE(default_drive_params)) {
4005 params = &default_drive_params[type].params;
4007 name = default_drive_params[type].name;
4008 allowed_drive_mask |= 1 << drive;
4010 allowed_drive_mask &= ~(1 << drive);
4012 params = &default_drive_params[0].params;
4013 snprintf(temparea, sizeof(temparea),
4014 "unknown type %d (usb?)", type);
4018 const char *prepend;
4022 pr_info("Floppy drive(s):");
4027 pr_cont("%s fd%d is %s", prepend, drive, name);
4029 drive_params[drive] = *params;
4036 static void floppy_release(struct gendisk *disk, fmode_t mode)
4038 int drive = (long)disk->private_data;
4040 mutex_lock(&floppy_mutex);
4041 mutex_lock(&open_lock);
4042 if (!drive_state[drive].fd_ref--) {
4043 DPRINT("floppy_release with fd_ref == 0");
4044 drive_state[drive].fd_ref = 0;
4046 if (!drive_state[drive].fd_ref)
4047 opened_bdev[drive] = NULL;
4048 mutex_unlock(&open_lock);
4049 mutex_unlock(&floppy_mutex);
4053 * floppy_open check for aliasing (/dev/fd0 can be the same as
4054 * /dev/PS0 etc), and disallows simultaneous access to the same
4055 * drive with different device numbers.
4057 static int floppy_open(struct block_device *bdev, fmode_t mode)
4059 int drive = (long)bdev->bd_disk->private_data;
4060 int old_dev, new_dev;
4065 mutex_lock(&floppy_mutex);
4066 mutex_lock(&open_lock);
4067 old_dev = drive_state[drive].fd_device;
4068 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
4071 if (!drive_state[drive].fd_ref && (drive_params[drive].flags & FD_BROKEN_DCL)) {
4072 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
4073 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
4076 drive_state[drive].fd_ref++;
4078 opened_bdev[drive] = bdev;
4082 if (!floppy_track_buffer) {
4083 /* if opening an ED drive, reserve a big buffer,
4084 * else reserve a small one */
4085 if ((drive_params[drive].cmos == 6) || (drive_params[drive].cmos == 5))
4086 try = 64; /* Only 48 actually useful */
4088 try = 32; /* Only 24 actually useful */
4090 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4091 if (!tmp && !floppy_track_buffer) {
4092 try >>= 1; /* buffer only one side */
4094 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4096 if (!tmp && !floppy_track_buffer)
4097 fallback_on_nodma_alloc(&tmp, 2048 * try);
4098 if (!tmp && !floppy_track_buffer) {
4099 DPRINT("Unable to allocate DMA memory\n");
4102 if (floppy_track_buffer) {
4104 fd_dma_mem_free((unsigned long)tmp, try * 1024);
4106 buffer_min = buffer_max = -1;
4107 floppy_track_buffer = tmp;
4108 max_buffer_sectors = try;
4112 new_dev = MINOR(bdev->bd_dev);
4113 drive_state[drive].fd_device = new_dev;
4114 set_capacity(disks[drive], floppy_sizes[new_dev]);
4115 if (old_dev != -1 && old_dev != new_dev) {
4116 if (buffer_drive == drive)
4120 if (fdc_state[FDC(drive)].rawcmd == 1)
4121 fdc_state[FDC(drive)].rawcmd = 2;
4123 if (!(mode & FMODE_NDELAY)) {
4124 if (mode & (FMODE_READ|FMODE_WRITE)) {
4125 drive_state[drive].last_checked = 0;
4126 clear_bit(FD_OPEN_SHOULD_FAIL_BIT,
4127 &drive_state[drive].flags);
4128 if (bdev_check_media_change(bdev))
4129 floppy_revalidate(bdev->bd_disk);
4130 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags))
4132 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags))
4136 if ((mode & FMODE_WRITE) &&
4137 !test_bit(FD_DISK_WRITABLE_BIT, &drive_state[drive].flags))
4140 mutex_unlock(&open_lock);
4141 mutex_unlock(&floppy_mutex);
4144 drive_state[drive].fd_ref--;
4146 if (!drive_state[drive].fd_ref)
4147 opened_bdev[drive] = NULL;
4149 mutex_unlock(&open_lock);
4150 mutex_unlock(&floppy_mutex);
4155 * Check if the disk has been changed or if a change has been faked.
4157 static unsigned int floppy_check_events(struct gendisk *disk,
4158 unsigned int clearing)
4160 int drive = (long)disk->private_data;
4162 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
4163 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags))
4164 return DISK_EVENT_MEDIA_CHANGE;
4166 if (time_after(jiffies, drive_state[drive].last_checked + drive_params[drive].checkfreq)) {
4167 if (lock_fdc(drive))
4169 poll_drive(false, 0);
4170 process_fd_request();
4173 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
4174 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) ||
4175 test_bit(drive, &fake_change) ||
4176 drive_no_geom(drive))
4177 return DISK_EVENT_MEDIA_CHANGE;
4182 * This implements "read block 0" for floppy_revalidate().
4183 * Needed for format autodetection, checking whether there is
4184 * a disk in the drive, and whether that disk is writable.
4189 struct completion complete;
4192 static void floppy_rb0_cb(struct bio *bio)
4194 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private;
4195 int drive = cbdata->drive;
4197 if (bio->bi_status) {
4198 pr_info("floppy: error %d while reading block 0\n",
4200 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &drive_state[drive].flags);
4202 complete(&cbdata->complete);
4205 static int __floppy_read_block_0(struct block_device *bdev, int drive)
4208 struct bio_vec bio_vec;
4210 struct rb0_cbdata cbdata;
4212 page = alloc_page(GFP_NOIO);
4214 process_fd_request();
4218 cbdata.drive = drive;
4220 bio_init(&bio, &bio_vec, 1);
4221 bio_set_dev(&bio, bdev);
4222 bio_add_page(&bio, page, block_size(bdev), 0);
4224 bio.bi_iter.bi_sector = 0;
4225 bio.bi_flags |= (1 << BIO_QUIET);
4226 bio.bi_private = &cbdata;
4227 bio.bi_end_io = floppy_rb0_cb;
4228 bio_set_op_attrs(&bio, REQ_OP_READ, 0);
4230 init_completion(&cbdata.complete);
4233 process_fd_request();
4235 wait_for_completion(&cbdata.complete);
4242 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
4243 * the bootblock (block 0). "Autodetection" is also needed to check whether
4244 * there is a disk in the drive at all... Thus we also do it for fixed
4245 * geometry formats */
4246 static int floppy_revalidate(struct gendisk *disk)
4248 int drive = (long)disk->private_data;
4252 if (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
4253 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags) ||
4254 test_bit(drive, &fake_change) ||
4255 drive_no_geom(drive)) {
4256 if (WARN(atomic_read(&usage_count) == 0,
4257 "VFS: revalidate called on non-open device.\n"))
4260 res = lock_fdc(drive);
4263 cf = (test_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags) ||
4264 test_bit(FD_VERIFY_BIT, &drive_state[drive].flags));
4265 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
4266 process_fd_request(); /*already done by another thread */
4269 drive_state[drive].maxblock = 0;
4270 drive_state[drive].maxtrack = 0;
4271 if (buffer_drive == drive)
4273 clear_bit(drive, &fake_change);
4274 clear_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
4276 drive_state[drive].generation++;
4277 if (drive_no_geom(drive)) {
4279 res = __floppy_read_block_0(opened_bdev[drive], drive);
4282 poll_drive(false, FD_RAW_NEED_DISK);
4283 process_fd_request();
4286 set_capacity(disk, floppy_sizes[drive_state[drive].fd_device]);
4290 static const struct block_device_operations floppy_fops = {
4291 .owner = THIS_MODULE,
4292 .open = floppy_open,
4293 .release = floppy_release,
4295 .getgeo = fd_getgeo,
4296 .check_events = floppy_check_events,
4297 #ifdef CONFIG_COMPAT
4298 .compat_ioctl = fd_compat_ioctl,
4303 * Floppy Driver initialization
4304 * =============================
4307 /* Determine the floppy disk controller type */
4308 /* This routine was written by David C. Niemi */
4309 static char __init get_fdc_version(int fdc)
4313 output_byte(fdc, FD_DUMPREGS); /* 82072 and better know DUMPREGS */
4314 if (fdc_state[fdc].reset)
4318 return FDC_NONE; /* No FDC present ??? */
4319 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4320 pr_info("FDC %d is an 8272A\n", fdc);
4321 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
4324 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
4329 if (!fdc_configure(fdc)) {
4330 pr_info("FDC %d is an 82072\n", fdc);
4331 return FDC_82072; /* 82072 doesn't know CONFIGURE */
4334 output_byte(fdc, FD_PERPENDICULAR);
4335 if (need_more_output(fdc) == MORE_OUTPUT) {
4336 output_byte(fdc, 0);
4338 pr_info("FDC %d is an 82072A\n", fdc);
4339 return FDC_82072A; /* 82072A as found on Sparcs. */
4342 output_byte(fdc, FD_UNLOCK);
4344 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4345 pr_info("FDC %d is a pre-1991 82077\n", fdc);
4346 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
4349 if ((r != 1) || (reply_buffer[0] != 0x00)) {
4350 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
4354 output_byte(fdc, FD_PARTID);
4357 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
4361 if (reply_buffer[0] == 0x80) {
4362 pr_info("FDC %d is a post-1991 82077\n", fdc);
4363 return FDC_82077; /* Revised 82077AA passes all the tests */
4365 switch (reply_buffer[0] >> 5) {
4367 /* Either a 82078-1 or a 82078SL running at 5Volt */
4368 pr_info("FDC %d is an 82078.\n", fdc);
4371 pr_info("FDC %d is a 44pin 82078\n", fdc);
4374 pr_info("FDC %d is a S82078B\n", fdc);
4377 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
4380 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4381 fdc, reply_buffer[0] >> 5);
4382 return FDC_82078_UNKN;
4384 } /* get_fdc_version */
4386 /* lilo configuration */
4388 static void __init floppy_set_flags(int *ints, int param, int param2)
4392 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4394 default_drive_params[i].params.flags |= param2;
4396 default_drive_params[i].params.flags &= ~param2;
4398 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4401 static void __init daring(int *ints, int param, int param2)
4405 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4407 default_drive_params[i].params.select_delay = 0;
4408 default_drive_params[i].params.flags |=
4409 FD_SILENT_DCL_CLEAR;
4411 default_drive_params[i].params.select_delay =
4413 default_drive_params[i].params.flags &=
4414 ~FD_SILENT_DCL_CLEAR;
4417 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4420 static void __init set_cmos(int *ints, int dummy, int dummy2)
4422 int current_drive = 0;
4425 DPRINT("wrong number of parameters for CMOS\n");
4428 current_drive = ints[1];
4429 if (current_drive < 0 || current_drive >= 8) {
4430 DPRINT("bad drive for set_cmos\n");
4434 if (current_drive >= 4 && !FDC2)
4437 drive_params[current_drive].cmos = ints[2];
4438 DPRINT("setting CMOS code to %d\n", ints[2]);
4441 static struct param_table {
4443 void (*fn) (int *ints, int param, int param2);
4447 } config_params[] __initdata = {
4448 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4449 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4450 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4451 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4452 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4453 {"daring", daring, NULL, 1, 0},
4455 {"two_fdc", NULL, &FDC2, 0x370, 0},
4456 {"one_fdc", NULL, &FDC2, 0, 0},
4458 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4459 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4460 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4461 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4462 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4463 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4464 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4465 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4466 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4467 {"nofifo", NULL, &no_fifo, 0x20, 0},
4468 {"usefifo", NULL, &no_fifo, 0, 0},
4469 {"cmos", set_cmos, NULL, 0, 0},
4470 {"slow", NULL, &slow_floppy, 1, 0},
4471 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4472 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4473 {"L40SX", NULL, &print_unex, 0, 0}
4478 static int __init floppy_setup(char *str)
4484 str = get_options(str, ARRAY_SIZE(ints), ints);
4486 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4487 if (strcmp(str, config_params[i].name) == 0) {
4491 param = config_params[i].def_param;
4492 if (config_params[i].fn)
4493 config_params[i].fn(ints, param,
4496 if (config_params[i].var) {
4497 DPRINT("%s=%d\n", str, param);
4498 *config_params[i].var = param;
4505 DPRINT("unknown floppy option [%s]\n", str);
4507 DPRINT("allowed options are:");
4508 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4509 pr_cont(" %s", config_params[i].name);
4512 DPRINT("botched floppy option\n");
4513 DPRINT("Read Documentation/admin-guide/blockdev/floppy.rst\n");
4517 static int have_no_fdc = -ENODEV;
4519 static ssize_t floppy_cmos_show(struct device *dev,
4520 struct device_attribute *attr, char *buf)
4522 struct platform_device *p = to_platform_device(dev);
4526 return sprintf(buf, "%X\n", drive_params[drive].cmos);
4529 static DEVICE_ATTR(cmos, 0444, floppy_cmos_show, NULL);
4531 static struct attribute *floppy_dev_attrs[] = {
4532 &dev_attr_cmos.attr,
4536 ATTRIBUTE_GROUPS(floppy_dev);
4538 static void floppy_device_release(struct device *dev)
4542 static int floppy_resume(struct device *dev)
4547 saved_drive = current_drive;
4548 for (fdc = 0; fdc < N_FDC; fdc++)
4549 if (fdc_state[fdc].address != -1)
4550 user_reset_fdc(REVDRIVE(fdc, 0), FD_RESET_ALWAYS, false);
4551 set_fdc(saved_drive);
4555 static const struct dev_pm_ops floppy_pm_ops = {
4556 .resume = floppy_resume,
4557 .restore = floppy_resume,
4560 static struct platform_driver floppy_driver = {
4563 .pm = &floppy_pm_ops,
4567 static const struct blk_mq_ops floppy_mq_ops = {
4568 .queue_rq = floppy_queue_rq,
4571 static struct platform_device floppy_device[N_DRIVE];
4573 static bool floppy_available(int drive)
4575 if (!(allowed_drive_mask & (1 << drive)))
4577 if (fdc_state[FDC(drive)].version == FDC_NONE)
4582 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4584 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4585 if (drive >= N_DRIVE || !floppy_available(drive))
4587 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4590 return get_disk_and_module(disks[drive]);
4593 static int __init do_floppy_init(void)
4595 int i, unit, drive, err;
4598 interruptjiffies = resultjiffies = jiffies;
4600 #if defined(CONFIG_PPC)
4601 if (check_legacy_ioport(FDC1))
4607 floppy_wq = alloc_ordered_workqueue("floppy", 0);
4611 for (drive = 0; drive < N_DRIVE; drive++) {
4612 disks[drive] = alloc_disk(1);
4613 if (!disks[drive]) {
4618 disks[drive]->queue = blk_mq_init_sq_queue(&tag_sets[drive],
4620 BLK_MQ_F_SHOULD_MERGE);
4621 if (IS_ERR(disks[drive]->queue)) {
4622 err = PTR_ERR(disks[drive]->queue);
4623 disks[drive]->queue = NULL;
4627 blk_queue_bounce_limit(disks[drive]->queue, BLK_BOUNCE_HIGH);
4628 blk_queue_max_hw_sectors(disks[drive]->queue, 64);
4629 disks[drive]->major = FLOPPY_MAJOR;
4630 disks[drive]->first_minor = TOMINOR(drive);
4631 disks[drive]->fops = &floppy_fops;
4632 disks[drive]->events = DISK_EVENT_MEDIA_CHANGE;
4633 sprintf(disks[drive]->disk_name, "fd%d", drive);
4635 timer_setup(&motor_off_timer[drive], motor_off_callback, 0);
4638 err = register_blkdev(FLOPPY_MAJOR, "fd");
4642 err = platform_driver_register(&floppy_driver);
4644 goto out_unreg_blkdev;
4646 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4647 floppy_find, NULL, NULL);
4649 for (i = 0; i < 256; i++)
4651 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4653 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4655 reschedule_timeout(MAXTIMEOUT, "floppy init");
4658 for (i = 0; i < N_FDC; i++) {
4659 memset(&fdc_state[i], 0, sizeof(*fdc_state));
4660 fdc_state[i].dtr = -1;
4661 fdc_state[i].dor = 0x4;
4662 #if defined(__sparc__) || defined(__mc68000__)
4663 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4667 fdc_state[i].version = FDC_82072A;
4671 use_virtual_dma = can_use_virtual_dma & 1;
4672 fdc_state[0].address = FDC1;
4673 if (fdc_state[0].address == -1) {
4674 cancel_delayed_work(&fd_timeout);
4676 goto out_unreg_region;
4679 fdc_state[1].address = FDC2;
4682 current_fdc = 0; /* reset fdc in case of unexpected interrupt */
4683 err = floppy_grab_irq_and_dma();
4685 cancel_delayed_work(&fd_timeout);
4687 goto out_unreg_region;
4690 /* initialise drive state */
4691 for (drive = 0; drive < N_DRIVE; drive++) {
4692 memset(&drive_state[drive], 0, sizeof(drive_state[drive]));
4693 memset(&write_errors[drive], 0, sizeof(write_errors[drive]));
4694 set_bit(FD_DISK_NEWCHANGE_BIT, &drive_state[drive].flags);
4695 set_bit(FD_DISK_CHANGED_BIT, &drive_state[drive].flags);
4696 set_bit(FD_VERIFY_BIT, &drive_state[drive].flags);
4697 drive_state[drive].fd_device = -1;
4698 floppy_track_buffer = NULL;
4699 max_buffer_sectors = 0;
4702 * Small 10 msec delay to let through any interrupt that
4703 * initialization might have triggered, to not
4704 * confuse detection:
4708 for (i = 0; i < N_FDC; i++) {
4709 fdc_state[i].driver_version = FD_DRIVER_VERSION;
4710 for (unit = 0; unit < 4; unit++)
4711 fdc_state[i].track[unit] = 0;
4712 if (fdc_state[i].address == -1)
4714 fdc_state[i].rawcmd = 2;
4715 if (user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false)) {
4716 /* free ioports reserved by floppy_grab_irq_and_dma() */
4717 floppy_release_regions(i);
4718 fdc_state[i].address = -1;
4719 fdc_state[i].version = FDC_NONE;
4722 /* Try to determine the floppy controller type */
4723 fdc_state[i].version = get_fdc_version(i);
4724 if (fdc_state[i].version == FDC_NONE) {
4725 /* free ioports reserved by floppy_grab_irq_and_dma() */
4726 floppy_release_regions(i);
4727 fdc_state[i].address = -1;
4730 if (can_use_virtual_dma == 2 &&
4731 fdc_state[i].version < FDC_82072A)
4732 can_use_virtual_dma = 0;
4735 /* Not all FDCs seem to be able to handle the version command
4736 * properly, so force a reset for the standard FDC clones,
4737 * to avoid interrupt garbage.
4739 user_reset_fdc(REVDRIVE(i, 0), FD_RESET_ALWAYS, false);
4742 cancel_delayed_work(&fd_timeout);
4746 DPRINT("no floppy controllers found\n");
4748 goto out_release_dma;
4751 for (drive = 0; drive < N_DRIVE; drive++) {
4752 if (!floppy_available(drive))
4755 floppy_device[drive].name = floppy_device_name;
4756 floppy_device[drive].id = drive;
4757 floppy_device[drive].dev.release = floppy_device_release;
4758 floppy_device[drive].dev.groups = floppy_dev_groups;
4760 err = platform_device_register(&floppy_device[drive]);
4762 goto out_remove_drives;
4764 /* to be cleaned up... */
4765 disks[drive]->private_data = (void *)(long)drive;
4766 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4767 device_add_disk(&floppy_device[drive].dev, disks[drive], NULL);
4774 if (floppy_available(drive)) {
4775 del_gendisk(disks[drive]);
4776 platform_device_unregister(&floppy_device[drive]);
4780 if (atomic_read(&usage_count))
4781 floppy_release_irq_and_dma();
4783 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4784 platform_driver_unregister(&floppy_driver);
4786 unregister_blkdev(FLOPPY_MAJOR, "fd");
4788 destroy_workqueue(floppy_wq);
4789 for (drive = 0; drive < N_DRIVE; drive++) {
4792 if (disks[drive]->queue) {
4793 del_timer_sync(&motor_off_timer[drive]);
4794 blk_cleanup_queue(disks[drive]->queue);
4795 disks[drive]->queue = NULL;
4796 blk_mq_free_tag_set(&tag_sets[drive]);
4798 put_disk(disks[drive]);
4804 static __init void floppy_async_init(void *data, async_cookie_t cookie)
4810 static int __init floppy_init(void)
4813 return do_floppy_init();
4815 /* Don't hold up the bootup by the floppy initialization */
4816 async_schedule(floppy_async_init, NULL);
4821 static const struct io_region {
4826 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4828 /* address + 6 is reserved, and may be taken by IDE.
4829 * Unfortunately, Adaptec doesn't know this :-(, */
4833 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4835 while (p != io_regions) {
4837 release_region(fdc_state[fdc].address + p->offset, p->size);
4841 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4843 static int floppy_request_regions(int fdc)
4845 const struct io_region *p;
4847 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4848 if (!request_region(fdc_state[fdc].address + p->offset,
4849 p->size, "floppy")) {
4850 DPRINT("Floppy io-port 0x%04lx in use\n",
4851 fdc_state[fdc].address + p->offset);
4852 floppy_release_allocated_regions(fdc, p);
4859 static void floppy_release_regions(int fdc)
4861 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4864 static int floppy_grab_irq_and_dma(void)
4868 if (atomic_inc_return(&usage_count) > 1)
4872 * We might have scheduled a free_irq(), wait it to
4875 flush_workqueue(floppy_wq);
4877 if (fd_request_irq()) {
4878 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4880 atomic_dec(&usage_count);
4883 if (fd_request_dma()) {
4884 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4886 if (can_use_virtual_dma & 2)
4887 use_virtual_dma = can_use_virtual_dma = 1;
4888 if (!(can_use_virtual_dma & 1)) {
4890 atomic_dec(&usage_count);
4895 for (fdc = 0; fdc < N_FDC; fdc++) {
4896 if (fdc_state[fdc].address != -1) {
4897 if (floppy_request_regions(fdc))
4901 for (fdc = 0; fdc < N_FDC; fdc++) {
4902 if (fdc_state[fdc].address != -1) {
4903 reset_fdc_info(fdc, 1);
4904 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
4908 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4910 for (fdc = 0; fdc < N_FDC; fdc++)
4911 if (fdc_state[fdc].address != -1)
4912 fdc_outb(fdc_state[fdc].dor, fdc, FD_DOR);
4914 * The driver will try and free resources and relies on us
4915 * to know if they were allocated or not.
4918 irqdma_allocated = 1;
4924 floppy_release_regions(fdc);
4926 atomic_dec(&usage_count);
4930 static void floppy_release_irq_and_dma(void)
4937 unsigned long tmpaddr;
4939 if (!atomic_dec_and_test(&usage_count))
4942 if (irqdma_allocated) {
4946 irqdma_allocated = 0;
4953 if (floppy_track_buffer && max_buffer_sectors) {
4954 tmpsize = max_buffer_sectors * 1024;
4955 tmpaddr = (unsigned long)floppy_track_buffer;
4956 floppy_track_buffer = NULL;
4957 max_buffer_sectors = 0;
4958 buffer_min = buffer_max = -1;
4959 fd_dma_mem_free(tmpaddr, tmpsize);
4962 for (drive = 0; drive < N_FDC * 4; drive++)
4963 if (timer_pending(motor_off_timer + drive))
4964 pr_info("motor off timer %d still active\n", drive);
4967 if (delayed_work_pending(&fd_timeout))
4968 pr_info("floppy timer still active:%s\n", timeout_message);
4969 if (delayed_work_pending(&fd_timer))
4970 pr_info("auxiliary floppy timer still active\n");
4971 if (work_pending(&floppy_work))
4972 pr_info("work still pending\n");
4973 for (fdc = 0; fdc < N_FDC; fdc++)
4974 if (fdc_state[fdc].address != -1)
4975 floppy_release_regions(fdc);
4980 static char *floppy;
4982 static void __init parse_floppy_cfg_string(char *cfg)
4988 while (*cfg && *cfg != ' ' && *cfg != '\t')
4999 static int __init floppy_module_init(void)
5002 parse_floppy_cfg_string(floppy);
5003 return floppy_init();
5005 module_init(floppy_module_init);
5007 static void __exit floppy_module_exit(void)
5011 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
5012 unregister_blkdev(FLOPPY_MAJOR, "fd");
5013 platform_driver_unregister(&floppy_driver);
5015 destroy_workqueue(floppy_wq);
5017 for (drive = 0; drive < N_DRIVE; drive++) {
5018 del_timer_sync(&motor_off_timer[drive]);
5020 if (floppy_available(drive)) {
5021 del_gendisk(disks[drive]);
5022 platform_device_unregister(&floppy_device[drive]);
5024 blk_cleanup_queue(disks[drive]->queue);
5025 blk_mq_free_tag_set(&tag_sets[drive]);
5028 * These disks have not called add_disk(). Don't put down
5029 * queue reference in put_disk().
5031 if (!(allowed_drive_mask & (1 << drive)) ||
5032 fdc_state[FDC(drive)].version == FDC_NONE)
5033 disks[drive]->queue = NULL;
5035 put_disk(disks[drive]);
5038 cancel_delayed_work_sync(&fd_timeout);
5039 cancel_delayed_work_sync(&fd_timer);
5041 if (atomic_read(&usage_count))
5042 floppy_release_irq_and_dma();
5044 /* eject disk, if any */
5048 module_exit(floppy_module_exit);
5050 module_param(floppy, charp, 0);
5051 module_param(FLOPPY_IRQ, int, 0);
5052 module_param(FLOPPY_DMA, int, 0);
5053 MODULE_AUTHOR("Alain L. Knaff");
5054 MODULE_SUPPORTED_DEVICE("fd");
5055 MODULE_LICENSE("GPL");
5057 /* This doesn't actually get used other than for module information */
5058 static const struct pnp_device_id floppy_pnpids[] = {
5063 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
5067 __setup("floppy=", floppy_setup);
5068 module_init(floppy_init)
5071 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);