2 * linux/drivers/block/floppy.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1993, 1994 Alain Knaff
6 * Copyright (C) 1998 Alan Cox
10 * 02.12.91 - Changed to static variables to indicate need for reset
11 * and recalibrate. This makes some things easier (output_byte reset
12 * checking etc), and means less interrupt jumping in case of errors,
13 * so the code is hopefully easier to understand.
17 * This file is certainly a mess. I've tried my best to get it working,
18 * but I don't like programming floppies, and I have only one anyway.
19 * Urgel. I should check for more errors, and do more graceful error
20 * recovery. Seems there are problems with several drives. I've tried to
21 * correct them. No promises.
25 * As with hd.c, all routines within this file can (and will) be called
26 * by interrupts, so extreme caution is needed. A hardware interrupt
27 * handler may not sleep, or a kernel panic will happen. Thus I cannot
28 * call "floppy-on" directly, but have to set a special timer interrupt
33 * 28.02.92 - made track-buffering routines, based on the routines written
34 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
38 * Automatic floppy-detection and formatting written by Werner Almesberger
39 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
40 * the floppy-change signal detection.
44 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
45 * FDC data overrun bug, added some preliminary stuff for vertical
48 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
50 * TODO: Errors are still not counted properly.
54 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
55 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
56 * Christoph H. Hochst\"atter.
57 * I have fixed the shift values to the ones I always use. Maybe a new
58 * ioctl() should be created to be able to modify them.
59 * There is a bug in the driver that makes it impossible to format a
60 * floppy as the first thing after bootup.
64 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
65 * this helped the floppy driver as well. Much cleaner, and still seems to
69 /* 1994/6/24 --bbroad-- added the floppy table entries and made
70 * minor modifications to allow 2.88 floppies to be run.
73 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
78 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
79 * format bug fixes, but unfortunately some new bugs too...
82 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
83 * errors to allow safe writing by specialized programs.
86 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
87 * by defining bit 1 of the "stretch" parameter to mean put sectors on the
88 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
89 * drives are "upside-down").
93 * 1995/8/26 -- Andreas Busse -- added Mips support.
97 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
98 * features to asm/floppy.h.
102 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
106 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
107 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
108 * use of '0' for NULL.
112 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
117 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
121 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
122 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
123 * being used to store jiffies, which are unsigned longs).
127 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
128 * - get rid of check_region
133 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
134 * floppy controller (lingering task on list after module is gone... boom.)
138 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
139 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
140 * requires many non-obvious changes in arch dependent code.
143 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
144 * Better audit of register_blkdev.
147 #undef FLOPPY_SILENT_DCL_CLEAR
149 #define REALLY_SLOW_IO
153 #define DPRINT(format, args...) \
154 pr_info("floppy%d: " format, current_drive, ##args)
156 #define DCL_DEBUG /* debug disk change line */
158 #define debug_dcl(test, fmt, args...) \
159 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
161 #define debug_dcl(test, fmt, args...) \
162 do { if (0) DPRINT(fmt, ##args); } while (0)
165 /* do print messages for unexpected interrupts */
166 static int print_unex = 1;
167 #include <linux/module.h>
168 #include <linux/sched.h>
169 #include <linux/fs.h>
170 #include <linux/kernel.h>
171 #include <linux/timer.h>
172 #include <linux/workqueue.h>
174 #include <linux/fdreg.h>
175 #include <linux/fd.h>
176 #include <linux/hdreg.h>
177 #include <linux/errno.h>
178 #include <linux/slab.h>
179 #include <linux/mm.h>
180 #include <linux/bio.h>
181 #include <linux/string.h>
182 #include <linux/jiffies.h>
183 #include <linux/fcntl.h>
184 #include <linux/delay.h>
185 #include <linux/mc146818rtc.h> /* CMOS defines */
186 #include <linux/ioport.h>
187 #include <linux/interrupt.h>
188 #include <linux/init.h>
189 #include <linux/platform_device.h>
190 #include <linux/mod_devicetable.h>
191 #include <linux/mutex.h>
192 #include <linux/io.h>
193 #include <linux/uaccess.h>
194 #include <linux/async.h>
197 * PS/2 floppies have much slower step rates than regular floppies.
198 * It's been recommended that take about 1/4 of the default speed
199 * in some more extreme cases.
201 static DEFINE_MUTEX(floppy_mutex);
202 static int slow_floppy;
207 static int FLOPPY_IRQ = 6;
208 static int FLOPPY_DMA = 2;
209 static int can_use_virtual_dma = 2;
211 * can use virtual DMA:
212 * 0 = use of virtual DMA disallowed by config
213 * 1 = use of virtual DMA prescribed by config
214 * 2 = no virtual DMA preference configured. By default try hard DMA,
215 * but fall back on virtual DMA when not enough memory available
218 static int use_virtual_dma;
222 * 1 using virtual DMA
223 * This variable is set to virtual when a DMA mem problem arises, and
224 * reset back in floppy_grab_irq_and_dma.
225 * It is not safe to reset it in other circumstances, because the floppy
226 * driver may have several buffers in use at once, and we do currently not
227 * record each buffers capabilities
230 static DEFINE_SPINLOCK(floppy_lock);
232 static unsigned short virtual_dma_port = 0x3f0;
233 irqreturn_t floppy_interrupt(int irq, void *dev_id);
234 static int set_dor(int fdc, char mask, char data);
236 #define K_64 0x10000 /* 64KB */
238 /* the following is the mask of allowed drives. By default units 2 and
239 * 3 of both floppy controllers are disabled, because switching on the
240 * motor of these drives causes system hangs on some PCI computers. drive
241 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
242 * a drive is allowed.
244 * NOTE: This must come before we include the arch floppy header because
245 * some ports reference this variable from there. -DaveM
248 static int allowed_drive_mask = 0x33;
250 #include <asm/floppy.h>
252 static int irqdma_allocated;
254 #include <linux/blkdev.h>
255 #include <linux/blkpg.h>
256 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
257 #include <linux/completion.h>
259 static struct request *current_req;
260 static void do_fd_request(struct request_queue *q);
261 static int set_next_request(void);
263 #ifndef fd_get_dma_residue
264 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
267 /* Dma Memory related stuff */
269 #ifndef fd_dma_mem_free
270 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
273 #ifndef fd_dma_mem_alloc
274 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
277 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
279 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
281 return; /* we have the memory */
282 if (can_use_virtual_dma != 2)
283 return; /* no fallback allowed */
284 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
285 *addr = (char *)nodma_mem_alloc(l);
291 /* End dma memory related stuff */
293 static unsigned long fake_change;
294 static bool initialized;
296 #define ITYPE(x) (((x) >> 2) & 0x1f)
297 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
298 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
299 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
300 /* reverse mapping from unit and fdc to drive */
301 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
303 #define DP (&drive_params[current_drive])
304 #define DRS (&drive_state[current_drive])
305 #define DRWE (&write_errors[current_drive])
306 #define FDCS (&fdc_state[fdc])
308 #define UDP (&drive_params[drive])
309 #define UDRS (&drive_state[drive])
310 #define UDRWE (&write_errors[drive])
311 #define UFDCS (&fdc_state[FDC(drive)])
313 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
314 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
317 #define COMMAND (raw_cmd->cmd[0])
318 #define DR_SELECT (raw_cmd->cmd[1])
319 #define TRACK (raw_cmd->cmd[2])
320 #define HEAD (raw_cmd->cmd[3])
321 #define SECTOR (raw_cmd->cmd[4])
322 #define SIZECODE (raw_cmd->cmd[5])
323 #define SECT_PER_TRACK (raw_cmd->cmd[6])
324 #define GAP (raw_cmd->cmd[7])
325 #define SIZECODE2 (raw_cmd->cmd[8])
329 #define F_SIZECODE (raw_cmd->cmd[2])
330 #define F_SECT_PER_TRACK (raw_cmd->cmd[3])
331 #define F_GAP (raw_cmd->cmd[4])
332 #define F_FILL (raw_cmd->cmd[5])
336 * Maximum disk size (in kilobytes).
337 * This default is used whenever the current disk size is unknown.
338 * [Now it is rather a minimum]
340 #define MAX_DISK_SIZE 4 /* 3984 */
343 * globals used by 'result()'
345 #define MAX_REPLIES 16
346 static unsigned char reply_buffer[MAX_REPLIES];
347 static int inr; /* size of reply buffer, when called from interrupt */
348 #define ST0 (reply_buffer[0])
349 #define ST1 (reply_buffer[1])
350 #define ST2 (reply_buffer[2])
351 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
352 #define R_TRACK (reply_buffer[3])
353 #define R_HEAD (reply_buffer[4])
354 #define R_SECTOR (reply_buffer[5])
355 #define R_SIZECODE (reply_buffer[6])
357 #define SEL_DLY (2 * HZ / 100)
360 * this struct defines the different floppy drive types.
363 struct floppy_drive_params params;
364 const char *name; /* name printed while booting */
365 } default_drive_params[] = {
366 /* NOTE: the time values in jiffies should be in msec!
368 | Maximum data rate supported by drive type
369 | | Head load time, msec
370 | | | Head unload time, msec (not used)
371 | | | | Step rate interval, usec
372 | | | | | Time needed for spinup time (jiffies)
373 | | | | | | Timeout for spinning down (jiffies)
374 | | | | | | | Spindown offset (where disk stops)
375 | | | | | | | | Select delay
376 | | | | | | | | | RPS
377 | | | | | | | | | | Max number of tracks
378 | | | | | | | | | | | Interrupt timeout
379 | | | | | | | | | | | | Max nonintlv. sectors
380 | | | | | | | | | | | | | -Max Errors- flags */
381 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
382 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
384 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
385 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
387 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
388 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
390 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
391 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
393 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
394 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
396 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
397 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
399 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
400 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
401 /* | --autodetected formats--- | | |
402 * read_track | | Name printed when booting
404 * Frequency of disk change checks */
407 static struct floppy_drive_params drive_params[N_DRIVE];
408 static struct floppy_drive_struct drive_state[N_DRIVE];
409 static struct floppy_write_errors write_errors[N_DRIVE];
410 static struct timer_list motor_off_timer[N_DRIVE];
411 static struct gendisk *disks[N_DRIVE];
412 static struct block_device *opened_bdev[N_DRIVE];
413 static DEFINE_MUTEX(open_lock);
414 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
415 static int fdc_queue;
418 * This struct defines the different floppy types.
420 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
421 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
422 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
423 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
424 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
425 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
426 * side 0 is on physical side 0 (but with the misnamed sector IDs).
427 * 'stretch' should probably be renamed to something more general, like
430 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
431 * The LSB (bit 2) is flipped. For most disks, the first sector
432 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
433 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
434 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
436 * Other parameters should be self-explanatory (see also setfdprm(8)).
445 | | | | | | Data rate, | 0x40 for perp
446 | | | | | | | Spec1 (stepping rate, head unload
447 | | | | | | | | /fmt gap (gap2) */
448 static struct floppy_struct floppy_type[32] = {
449 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
450 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
451 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
452 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
453 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
454 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
455 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
456 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
457 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
458 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
460 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
461 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
462 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
463 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
464 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
465 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
466 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
467 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
468 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
469 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
471 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
472 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
473 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
474 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
475 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
476 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
477 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
478 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
479 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
480 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
482 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
483 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
486 #define SECTSIZE (_FD_SECTSIZE(*floppy))
488 /* Auto-detection: Disk type used until the next media change occurs. */
489 static struct floppy_struct *current_type[N_DRIVE];
492 * User-provided type information. current_type points to
493 * the respective entry of this array.
495 static struct floppy_struct user_params[N_DRIVE];
497 static sector_t floppy_sizes[256];
499 static char floppy_device_name[] = "floppy";
502 * The driver is trying to determine the correct media format
503 * while probing is set. rw_interrupt() clears it after a
508 /* Synchronization of FDC access. */
509 #define FD_COMMAND_NONE -1
510 #define FD_COMMAND_ERROR 2
511 #define FD_COMMAND_OKAY 3
513 static volatile int command_status = FD_COMMAND_NONE;
514 static unsigned long fdc_busy;
515 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
516 static DECLARE_WAIT_QUEUE_HEAD(command_done);
518 /* Errors during formatting are counted here. */
519 static int format_errors;
521 /* Format request descriptor. */
522 static struct format_descr format_req;
525 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
526 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
527 * H is head unload time (1=16ms, 2=32ms, etc)
532 * Because these are written to by the DMA controller, they must
533 * not contain a 64k byte boundary crossing, or data will be
536 static char *floppy_track_buffer;
537 static int max_buffer_sectors;
540 typedef void (*done_f)(int);
541 static const struct cont_t {
542 void (*interrupt)(void);
543 /* this is called after the interrupt of the
545 void (*redo)(void); /* this is called to retry the operation */
546 void (*error)(void); /* this is called to tally an error */
547 done_f done; /* this is called to say if the operation has
548 * succeeded/failed */
551 static void floppy_ready(void);
552 static void floppy_start(void);
553 static void process_fd_request(void);
554 static void recalibrate_floppy(void);
555 static void floppy_shutdown(struct work_struct *);
557 static int floppy_request_regions(int);
558 static void floppy_release_regions(int);
559 static int floppy_grab_irq_and_dma(void);
560 static void floppy_release_irq_and_dma(void);
563 * The "reset" variable should be tested whenever an interrupt is scheduled,
564 * after the commands have been sent. This is to ensure that the driver doesn't
565 * get wedged when the interrupt doesn't come because of a failed command.
566 * reset doesn't need to be tested before sending commands, because
567 * output_byte is automatically disabled when reset is set.
569 static void reset_fdc(void);
572 * These are global variables, as that's the easiest way to give
573 * information to interrupts. They are the data used for the current
577 #define NEED_1_RECAL -2
578 #define NEED_2_RECAL -3
580 static atomic_t usage_count = ATOMIC_INIT(0);
582 /* buffer related variables */
583 static int buffer_track = -1;
584 static int buffer_drive = -1;
585 static int buffer_min = -1;
586 static int buffer_max = -1;
588 /* fdc related variables, should end up in a struct */
589 static struct floppy_fdc_state fdc_state[N_FDC];
590 static int fdc; /* current fdc */
592 static struct workqueue_struct *floppy_wq;
594 static struct floppy_struct *_floppy = floppy_type;
595 static unsigned char current_drive;
596 static long current_count_sectors;
597 static unsigned char fsector_t; /* sector in track */
598 static unsigned char in_sector_offset; /* offset within physical sector,
599 * expressed in units of 512 bytes */
601 static inline bool drive_no_geom(int drive)
603 return !current_type[drive] && !ITYPE(UDRS->fd_device);
607 static inline int fd_eject(int drive)
618 static long unsigned debugtimer;
620 static inline void set_debugt(void)
622 debugtimer = jiffies;
625 static inline void debugt(const char *func, const char *msg)
627 if (DP->flags & DEBUGT)
628 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
631 static inline void set_debugt(void) { }
632 static inline void debugt(const char *func, const char *msg) { }
636 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
637 static const char *timeout_message;
639 static void is_alive(const char *func, const char *message)
641 /* this routine checks whether the floppy driver is "alive" */
642 if (test_bit(0, &fdc_busy) && command_status < 2 &&
643 !delayed_work_pending(&fd_timeout)) {
644 DPRINT("%s: timeout handler died. %s\n", func, message);
648 static void (*do_floppy)(void) = NULL;
652 static void (*lasthandler)(void);
653 static unsigned long interruptjiffies;
654 static unsigned long resultjiffies;
655 static int resultsize;
656 static unsigned long lastredo;
658 static struct output_log {
660 unsigned char status;
661 unsigned long jiffies;
662 } output_log[OLOGSIZE];
664 static int output_log_pos;
666 #define current_reqD -1
667 #define MAXTIMEOUT -2
669 static void __reschedule_timeout(int drive, const char *message)
673 if (drive == current_reqD)
674 drive = current_drive;
676 if (drive < 0 || drive >= N_DRIVE) {
680 delay = UDP->timeout;
682 queue_delayed_work(floppy_wq, &fd_timeout, delay);
683 if (UDP->flags & FD_DEBUG)
684 DPRINT("reschedule timeout %s\n", message);
685 timeout_message = message;
688 static void reschedule_timeout(int drive, const char *message)
692 spin_lock_irqsave(&floppy_lock, flags);
693 __reschedule_timeout(drive, message);
694 spin_unlock_irqrestore(&floppy_lock, flags);
697 #define INFBOUND(a, b) (a) = max_t(int, a, b)
698 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
701 * Bottom half floppy driver.
702 * ==========================
704 * This part of the file contains the code talking directly to the hardware,
705 * and also the main service loop (seek-configure-spinup-command)
710 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
711 * and the last_checked date.
713 * last_checked is the date of the last check which showed 'no disk change'
714 * FD_DISK_CHANGE is set under two conditions:
715 * 1. The floppy has been changed after some i/o to that floppy already
717 * 2. No floppy disk is in the drive. This is done in order to ensure that
718 * requests are quickly flushed in case there is no disk in the drive. It
719 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
722 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
723 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
724 * each seek. If a disk is present, the disk change line should also be
725 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
726 * change line is set, this means either that no disk is in the drive, or
727 * that it has been removed since the last seek.
729 * This means that we really have a third possibility too:
730 * The floppy has been changed after the last seek.
733 static int disk_change(int drive)
735 int fdc = FDC(drive);
737 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
738 DPRINT("WARNING disk change called early\n");
739 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
740 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
741 DPRINT("probing disk change on unselected drive\n");
742 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
743 (unsigned int)FDCS->dor);
746 debug_dcl(UDP->flags,
747 "checking disk change line for drive %d\n", drive);
748 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
749 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
750 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);
752 if (UDP->flags & FD_BROKEN_DCL)
753 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
754 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
755 set_bit(FD_VERIFY_BIT, &UDRS->flags);
756 /* verify write protection */
758 if (UDRS->maxblock) /* mark it changed */
759 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
761 /* invalidate its geometry */
762 if (UDRS->keep_data >= 0) {
763 if ((UDP->flags & FTD_MSG) &&
764 current_type[drive] != NULL)
765 DPRINT("Disk type is undefined after disk change\n");
766 current_type[drive] = NULL;
767 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
772 UDRS->last_checked = jiffies;
773 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
778 static inline int is_selected(int dor, int unit)
780 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
783 static bool is_ready_state(int status)
785 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
786 return state == STATUS_READY;
789 static int set_dor(int fdc, char mask, char data)
793 unsigned char newdor;
794 unsigned char olddor;
796 if (FDCS->address == -1)
800 newdor = (olddor & mask) | data;
801 if (newdor != olddor) {
803 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
804 drive = REVDRIVE(fdc, unit);
805 debug_dcl(UDP->flags,
806 "calling disk change from set_dor\n");
810 fd_outb(newdor, FD_DOR);
813 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
814 drive = REVDRIVE(fdc, unit);
815 UDRS->select_date = jiffies;
821 static void twaddle(void)
823 if (DP->select_delay)
825 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
826 fd_outb(FDCS->dor, FD_DOR);
827 DRS->select_date = jiffies;
831 * Reset all driver information about the current fdc.
832 * This is needed after a reset, and after a raw command.
834 static void reset_fdc_info(int mode)
838 FDCS->spec1 = FDCS->spec2 = -1;
839 FDCS->need_configure = 1;
842 for (drive = 0; drive < N_DRIVE; drive++)
843 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
844 UDRS->track = NEED_2_RECAL;
847 /* selects the fdc and drive, and enables the fdc's input/dma. */
848 static void set_fdc(int drive)
850 if (drive >= 0 && drive < N_DRIVE) {
852 current_drive = drive;
854 if (fdc != 1 && fdc != 0) {
855 pr_info("bad fdc value\n");
860 set_dor(1 - fdc, ~8, 0);
862 if (FDCS->rawcmd == 2)
864 if (fd_inb(FD_STATUS) != STATUS_READY)
868 /* locks the driver */
869 static int lock_fdc(int drive, bool interruptible)
871 if (WARN(atomic_read(&usage_count) == 0,
872 "Trying to lock fdc while usage count=0\n"))
875 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
878 command_status = FD_COMMAND_NONE;
880 reschedule_timeout(drive, "lock fdc");
885 /* unlocks the driver */
886 static void unlock_fdc(void)
888 if (!test_bit(0, &fdc_busy))
889 DPRINT("FDC access conflict!\n");
892 command_status = FD_COMMAND_NONE;
893 __cancel_delayed_work(&fd_timeout);
896 clear_bit(0, &fdc_busy);
900 /* switches the motor off after a given timeout */
901 static void motor_off_callback(unsigned long nr)
903 unsigned char mask = ~(0x10 << UNIT(nr));
905 set_dor(FDC(nr), mask, 0);
908 /* schedules motor off */
909 static void floppy_off(unsigned int drive)
911 unsigned long volatile delta;
912 int fdc = FDC(drive);
914 if (!(FDCS->dor & (0x10 << UNIT(drive))))
917 del_timer(motor_off_timer + drive);
919 /* make spindle stop in a position which minimizes spinup time
922 delta = jiffies - UDRS->first_read_date + HZ -
923 UDP->spindown_offset;
924 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
925 motor_off_timer[drive].expires =
926 jiffies + UDP->spindown - delta;
928 add_timer(motor_off_timer + drive);
932 * cycle through all N_DRIVE floppy drives, for disk change testing.
933 * stopping at current drive. This is done before any long operation, to
934 * be sure to have up to date disk change information.
936 static void scandrives(void)
942 if (DP->select_delay)
945 saved_drive = current_drive;
946 for (i = 0; i < N_DRIVE; i++) {
947 drive = (saved_drive + i + 1) % N_DRIVE;
948 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
949 continue; /* skip closed drives */
951 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
952 (0x10 << UNIT(drive))))
953 /* switch the motor off again, if it was off to
955 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
957 set_fdc(saved_drive);
960 static void empty(void)
964 static DECLARE_WORK(floppy_work, NULL);
966 static void schedule_bh(void (*handler)(void))
968 WARN_ON(work_pending(&floppy_work));
970 PREPARE_WORK(&floppy_work, (work_func_t)handler);
971 queue_work(floppy_wq, &floppy_work);
974 static DECLARE_DELAYED_WORK(fd_timer, NULL);
976 static void cancel_activity(void)
979 cancel_delayed_work_sync(&fd_timer);
980 cancel_work_sync(&floppy_work);
983 /* this function makes sure that the disk stays in the drive during the
985 static void fd_watchdog(struct work_struct *arg)
987 debug_dcl(DP->flags, "calling disk change from watchdog\n");
989 if (disk_change(current_drive)) {
990 DPRINT("disk removed during i/o\n");
995 cancel_delayed_work(&fd_timer);
996 PREPARE_DELAYED_WORK(&fd_timer, fd_watchdog);
997 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
1001 static void main_command_interrupt(void)
1003 cancel_delayed_work(&fd_timer);
1007 /* waits for a delay (spinup or select) to pass */
1008 static int fd_wait_for_completion(unsigned long expires, work_func_t function)
1011 reset_fdc(); /* do the reset during sleep to win time
1012 * if we don't need to sleep, it's a good
1013 * occasion anyways */
1017 if (time_before(jiffies, expires)) {
1018 cancel_delayed_work(&fd_timer);
1019 PREPARE_DELAYED_WORK(&fd_timer, function);
1020 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
1026 static void setup_DMA(void)
1030 if (raw_cmd->length == 0) {
1033 pr_info("zero dma transfer size:");
1034 for (i = 0; i < raw_cmd->cmd_count; i++)
1035 pr_cont("%x,", raw_cmd->cmd[i]);
1041 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1042 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1047 f = claim_dma_lock();
1050 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1051 (raw_cmd->flags & FD_RAW_READ) ?
1052 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1053 release_dma_lock(f);
1058 release_dma_lock(f);
1061 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1062 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1063 DMA_MODE_READ : DMA_MODE_WRITE);
1064 fd_set_dma_addr(raw_cmd->kernel_data);
1065 fd_set_dma_count(raw_cmd->length);
1066 virtual_dma_port = FDCS->address;
1068 release_dma_lock(f);
1072 static void show_floppy(void);
1074 /* waits until the fdc becomes ready */
1075 static int wait_til_ready(void)
1082 for (counter = 0; counter < 10000; counter++) {
1083 status = fd_inb(FD_STATUS);
1084 if (status & STATUS_READY)
1088 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1095 /* sends a command byte to the fdc */
1096 static int output_byte(char byte)
1098 int status = wait_til_ready();
1103 if (is_ready_state(status)) {
1104 fd_outb(byte, FD_DATA);
1105 output_log[output_log_pos].data = byte;
1106 output_log[output_log_pos].status = status;
1107 output_log[output_log_pos].jiffies = jiffies;
1108 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1113 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1120 /* gets the response from the fdc */
1121 static int result(void)
1126 for (i = 0; i < MAX_REPLIES; i++) {
1127 status = wait_til_ready();
1130 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1131 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1132 resultjiffies = jiffies;
1136 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1137 reply_buffer[i] = fd_inb(FD_DATA);
1142 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1150 #define MORE_OUTPUT -2
1151 /* does the fdc need more output? */
1152 static int need_more_output(void)
1154 int status = wait_til_ready();
1159 if (is_ready_state(status))
1165 /* Set perpendicular mode as required, based on data rate, if supported.
1166 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1168 static void perpendicular_mode(void)
1170 unsigned char perp_mode;
1172 if (raw_cmd->rate & 0x40) {
1173 switch (raw_cmd->rate & 3) {
1181 DPRINT("Invalid data rate for perpendicular mode!\n");
1185 * convenient way to return to
1186 * redo without too much hassle
1187 * (deep stack et al.)
1194 if (FDCS->perp_mode == perp_mode)
1196 if (FDCS->version >= FDC_82077_ORIG) {
1197 output_byte(FD_PERPENDICULAR);
1198 output_byte(perp_mode);
1199 FDCS->perp_mode = perp_mode;
1200 } else if (perp_mode) {
1201 DPRINT("perpendicular mode not supported by this FDC.\n");
1203 } /* perpendicular_mode */
1205 static int fifo_depth = 0xa;
1208 static int fdc_configure(void)
1211 output_byte(FD_CONFIGURE);
1212 if (need_more_output() != MORE_OUTPUT)
1215 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1216 output_byte(0); /* pre-compensation from track
1221 #define NOMINAL_DTR 500
1223 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1224 * head load time, and DMA disable flag to values needed by floppy.
1226 * The value "dtr" is the data transfer rate in Kbps. It is needed
1227 * to account for the data rate-based scaling done by the 82072 and 82077
1228 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1231 * Note that changing the data transfer rate has a (probably deleterious)
1232 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1233 * fdc_specify is called again after each data transfer rate
1236 * srt: 1000 to 16000 in microseconds
1237 * hut: 16 to 240 milliseconds
1238 * hlt: 2 to 254 milliseconds
1240 * These values are rounded up to the next highest available delay time.
1242 static void fdc_specify(void)
1244 unsigned char spec1;
1245 unsigned char spec2;
1249 unsigned long dtr = NOMINAL_DTR;
1250 unsigned long scale_dtr = NOMINAL_DTR;
1251 int hlt_max_code = 0x7f;
1252 int hut_max_code = 0xf;
1254 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1256 FDCS->need_configure = 0;
1259 switch (raw_cmd->rate & 0x03) {
1265 if (FDCS->version >= FDC_82078) {
1266 /* chose the default rate table, not the one
1267 * where 1 = 2 Mbps */
1268 output_byte(FD_DRIVESPEC);
1269 if (need_more_output() == MORE_OUTPUT) {
1270 output_byte(UNIT(current_drive));
1280 if (FDCS->version >= FDC_82072) {
1282 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1283 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1286 /* Convert step rate from microseconds to milliseconds and 4 bits */
1287 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1294 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1297 else if (hlt > 0x7f)
1300 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1306 spec1 = (srt << 4) | hut;
1307 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1309 /* If these parameters did not change, just return with success */
1310 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1311 /* Go ahead and set spec1 and spec2 */
1312 output_byte(FD_SPECIFY);
1313 output_byte(FDCS->spec1 = spec1);
1314 output_byte(FDCS->spec2 = spec2);
1318 /* Set the FDC's data transfer rate on behalf of the specified drive.
1319 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1320 * of the specify command (i.e. using the fdc_specify function).
1322 static int fdc_dtr(void)
1324 /* If data rate not already set to desired value, set it. */
1325 if ((raw_cmd->rate & 3) == FDCS->dtr)
1329 fd_outb(raw_cmd->rate & 3, FD_DCR);
1331 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1332 * need a stabilization period of several milliseconds to be
1333 * enforced after data rate changes before R/W operations.
1334 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1336 FDCS->dtr = raw_cmd->rate & 3;
1337 return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1338 (work_func_t)floppy_ready);
1341 static void tell_sector(void)
1343 pr_cont(": track %d, head %d, sector %d, size %d",
1344 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1347 static void print_errors(void)
1350 if (ST0 & ST0_ECE) {
1351 pr_cont("Recalibrate failed!");
1352 } else if (ST2 & ST2_CRC) {
1353 pr_cont("data CRC error");
1355 } else if (ST1 & ST1_CRC) {
1356 pr_cont("CRC error");
1358 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1361 pr_cont("sector not found");
1364 pr_cont("probe failed...");
1365 } else if (ST2 & ST2_WC) { /* seek error */
1366 pr_cont("wrong cylinder");
1367 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1368 pr_cont("bad cylinder");
1370 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1378 * OK, this error interpreting routine is called after a
1379 * DMA read/write has succeeded
1380 * or failed, so we check the results, and copy any buffers.
1381 * hhb: Added better error reporting.
1382 * ak: Made this into a separate routine.
1384 static int interpret_errors(void)
1389 DPRINT("-- FDC reply error\n");
1394 /* check IC to find cause of interrupt */
1395 switch (ST0 & ST0_INTR) {
1396 case 0x40: /* error occurred during command execution */
1398 return 0; /* occurs with pseudo-DMA */
1401 DPRINT("Drive is write protected\n");
1402 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1405 } else if (ST1 & ST1_ND) {
1406 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1407 } else if (ST1 & ST1_OR) {
1408 if (DP->flags & FTD_MSG)
1409 DPRINT("Over/Underrun - retrying\n");
1411 } else if (*errors >= DP->max_errors.reporting) {
1414 if (ST2 & ST2_WC || ST2 & ST2_BC)
1415 /* wrong cylinder => recal */
1416 DRS->track = NEED_2_RECAL;
1418 case 0x80: /* invalid command given */
1419 DPRINT("Invalid FDC command given!\n");
1423 DPRINT("Abnormal termination caused by polling\n");
1426 default: /* (0) Normal command termination */
1432 * This routine is called when everything should be correctly set up
1433 * for the transfer (i.e. floppy motor is on, the correct floppy is
1434 * selected, and the head is sitting on the right track).
1436 static void setup_rw_floppy(void)
1442 unsigned long ready_date;
1443 work_func_t function;
1445 flags = raw_cmd->flags;
1446 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1447 flags |= FD_RAW_INTR;
1449 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1450 ready_date = DRS->spinup_date + DP->spinup;
1451 /* If spinup will take a long time, rerun scandrives
1452 * again just before spinup completion. Beware that
1453 * after scandrives, we must again wait for selection.
1455 if (time_after(ready_date, jiffies + DP->select_delay)) {
1456 ready_date -= DP->select_delay;
1457 function = (work_func_t)floppy_start;
1459 function = (work_func_t)setup_rw_floppy;
1461 /* wait until the floppy is spinning fast enough */
1462 if (fd_wait_for_completion(ready_date, function))
1465 dflags = DRS->flags;
1467 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1470 if (flags & FD_RAW_INTR)
1471 do_floppy = main_command_interrupt;
1474 for (i = 0; i < raw_cmd->cmd_count; i++)
1475 r |= output_byte(raw_cmd->cmd[i]);
1477 debugt(__func__, "rw_command");
1485 if (!(flags & FD_RAW_INTR)) {
1488 } else if (flags & FD_RAW_NEED_DISK)
1492 static int blind_seek;
1495 * This is the routine called after every seek (or recalibrate) interrupt
1496 * from the floppy controller.
1498 static void seek_interrupt(void)
1500 debugt(__func__, "");
1501 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1502 DPRINT("seek failed\n");
1503 DRS->track = NEED_2_RECAL;
1508 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1509 debug_dcl(DP->flags,
1510 "clearing NEWCHANGE flag because of effective seek\n");
1511 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1512 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1513 /* effective seek */
1514 DRS->select_date = jiffies;
1520 static void check_wp(void)
1522 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1523 /* check write protection */
1524 output_byte(FD_GETSTATUS);
1525 output_byte(UNIT(current_drive));
1526 if (result() != 1) {
1530 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1531 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1532 debug_dcl(DP->flags,
1533 "checking whether disk is write protected\n");
1534 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1536 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1538 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1542 static void seek_floppy(void)
1548 debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
1550 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1551 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1552 /* the media changed flag should be cleared after the seek.
1553 * If it isn't, this means that there is really no disk in
1556 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1561 if (DRS->track <= NEED_1_RECAL) {
1562 recalibrate_floppy();
1564 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1565 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1566 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1567 /* we seek to clear the media-changed condition. Does anybody
1568 * know a more elegant way, which works on all drives? */
1570 track = raw_cmd->track - 1;
1572 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1573 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1575 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1581 if (raw_cmd->track != DRS->track &&
1582 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1583 track = raw_cmd->track;
1590 do_floppy = seek_interrupt;
1591 output_byte(FD_SEEK);
1592 output_byte(UNIT(current_drive));
1593 if (output_byte(track) < 0) {
1597 debugt(__func__, "");
1600 static void recal_interrupt(void)
1602 debugt(__func__, "");
1605 else if (ST0 & ST0_ECE) {
1606 switch (DRS->track) {
1608 debugt(__func__, "need 1 recal");
1609 /* after a second recalibrate, we still haven't
1610 * reached track 0. Probably no drive. Raise an
1611 * error, as failing immediately might upset
1612 * computers possessed by the Devil :-) */
1617 debugt(__func__, "need 2 recal");
1618 /* If we already did a recalibrate,
1619 * and we are not at track 0, this
1620 * means we have moved. (The only way
1621 * not to move at recalibration is to
1622 * be already at track 0.) Clear the
1623 * new change flag */
1624 debug_dcl(DP->flags,
1625 "clearing NEWCHANGE flag because of second recalibrate\n");
1627 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1628 DRS->select_date = jiffies;
1631 debugt(__func__, "default");
1632 /* Recalibrate moves the head by at
1633 * most 80 steps. If after one
1634 * recalibrate we don't have reached
1635 * track 0, this might mean that we
1636 * started beyond track 80. Try
1638 DRS->track = NEED_1_RECAL;
1646 static void print_result(char *message, int inr)
1650 DPRINT("%s ", message);
1652 for (i = 0; i < inr; i++)
1653 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1657 /* interrupt handler. Note that this can be called externally on the Sparc */
1658 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1662 void (*handler)(void) = do_floppy;
1664 lasthandler = handler;
1665 interruptjiffies = jiffies;
1667 f = claim_dma_lock();
1669 release_dma_lock(f);
1672 if (fdc >= N_FDC || FDCS->address == -1) {
1673 /* we don't even know which FDC is the culprit */
1674 pr_info("DOR0=%x\n", fdc_state[0].dor);
1675 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1676 pr_info("handler=%pf\n", handler);
1677 is_alive(__func__, "bizarre fdc");
1682 /* We have to clear the reset flag here, because apparently on boxes
1683 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1684 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1685 * emission of the SENSEI's.
1686 * It is OK to emit floppy commands because we are in an interrupt
1687 * handler here, and thus we have to fear no interference of other
1691 do_print = !handler && print_unex && initialized;
1695 print_result("unexpected interrupt", inr);
1699 output_byte(FD_SENSEI);
1702 print_result("sensei", inr);
1704 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1705 inr == 2 && max_sensei);
1711 schedule_bh(handler);
1712 is_alive(__func__, "normal interrupt end");
1714 /* FIXME! Was it really for us? */
1718 static void recalibrate_floppy(void)
1720 debugt(__func__, "");
1721 do_floppy = recal_interrupt;
1722 output_byte(FD_RECALIBRATE);
1723 if (output_byte(UNIT(current_drive)) < 0)
1728 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1730 static void reset_interrupt(void)
1732 debugt(__func__, "");
1733 result(); /* get the status ready for set_fdc */
1735 pr_info("reset set in interrupt, calling %pf\n", cont->error);
1736 cont->error(); /* a reset just after a reset. BAD! */
1742 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1743 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1745 static void reset_fdc(void)
1747 unsigned long flags;
1749 do_floppy = reset_interrupt;
1753 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1754 /* Irrelevant for systems with true DMA (i386). */
1756 flags = claim_dma_lock();
1758 release_dma_lock(flags);
1760 if (FDCS->version >= FDC_82072A)
1761 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1763 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1764 udelay(FD_RESET_DELAY);
1765 fd_outb(FDCS->dor, FD_DOR);
1769 static void show_floppy(void)
1774 pr_info("floppy driver state\n");
1775 pr_info("-------------------\n");
1776 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1777 jiffies, interruptjiffies, jiffies - interruptjiffies,
1780 pr_info("timeout_message=%s\n", timeout_message);
1781 pr_info("last output bytes:\n");
1782 for (i = 0; i < OLOGSIZE; i++)
1783 pr_info("%2x %2x %lu\n",
1784 output_log[(i + output_log_pos) % OLOGSIZE].data,
1785 output_log[(i + output_log_pos) % OLOGSIZE].status,
1786 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1787 pr_info("last result at %lu\n", resultjiffies);
1788 pr_info("last redo_fd_request at %lu\n", lastredo);
1789 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1790 reply_buffer, resultsize, true);
1792 pr_info("status=%x\n", fd_inb(FD_STATUS));
1793 pr_info("fdc_busy=%lu\n", fdc_busy);
1795 pr_info("do_floppy=%pf\n", do_floppy);
1796 if (work_pending(&floppy_work))
1797 pr_info("floppy_work.func=%pf\n", floppy_work.func);
1798 if (delayed_work_pending(&fd_timer))
1799 pr_info("delayed work.function=%p expires=%ld\n",
1801 fd_timer.timer.expires - jiffies);
1802 if (delayed_work_pending(&fd_timeout))
1803 pr_info("timer_function=%p expires=%ld\n",
1804 fd_timeout.work.func,
1805 fd_timeout.timer.expires - jiffies);
1807 pr_info("cont=%p\n", cont);
1808 pr_info("current_req=%p\n", current_req);
1809 pr_info("command_status=%d\n", command_status);
1813 static void floppy_shutdown(struct work_struct *arg)
1815 unsigned long flags;
1821 flags = claim_dma_lock();
1823 release_dma_lock(flags);
1825 /* avoid dma going to a random drive after shutdown */
1828 DPRINT("floppy timeout called\n");
1832 cont->redo(); /* this will recall reset when needed */
1834 pr_info("no cont in shutdown!\n");
1835 process_fd_request();
1837 is_alive(__func__, "");
1840 /* start motor, check media-changed condition and write protection */
1841 static int start_motor(void (*function)(void))
1847 data = UNIT(current_drive);
1848 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1849 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1851 /* no read since this drive is running */
1852 DRS->first_read_date = 0;
1853 /* note motor start time if motor is not yet running */
1854 DRS->spinup_date = jiffies;
1855 data |= (0x10 << UNIT(current_drive));
1857 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1858 mask &= ~(0x10 << UNIT(current_drive));
1860 /* starts motor and selects floppy */
1861 del_timer(motor_off_timer + current_drive);
1862 set_dor(fdc, mask, data);
1864 /* wait_for_completion also schedules reset if needed. */
1865 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1866 (work_func_t)function);
1869 static void floppy_ready(void)
1875 if (start_motor(floppy_ready))
1880 debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1881 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1882 disk_change(current_drive) && !DP->select_delay)
1883 twaddle(); /* this clears the dcl on certain
1884 * drive/controller combinations */
1886 #ifdef fd_chose_dma_mode
1887 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1888 unsigned long flags = claim_dma_lock();
1889 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1890 release_dma_lock(flags);
1894 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1895 perpendicular_mode();
1896 fdc_specify(); /* must be done here because of hut, hlt ... */
1899 if ((raw_cmd->flags & FD_RAW_READ) ||
1900 (raw_cmd->flags & FD_RAW_WRITE))
1906 static void floppy_start(void)
1908 reschedule_timeout(current_reqD, "floppy start");
1911 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1912 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1917 * ========================================================================
1918 * here ends the bottom half. Exported routines are:
1919 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1920 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1921 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1923 * ========================================================================
1926 * General purpose continuations.
1927 * ==============================
1930 static void do_wakeup(void)
1932 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1934 command_status += 2;
1935 wake_up(&command_done);
1938 static const struct cont_t wakeup_cont = {
1942 .done = (done_f)empty
1945 static const struct cont_t intr_cont = {
1947 .redo = process_fd_request,
1949 .done = (done_f)empty
1952 static int wait_til_done(void (*handler)(void), bool interruptible)
1956 schedule_bh(handler);
1959 wait_event_interruptible(command_done, command_status >= 2);
1961 wait_event(command_done, command_status >= 2);
1963 if (command_status < 2) {
1971 command_status = FD_COMMAND_ERROR;
1972 if (command_status == FD_COMMAND_OKAY)
1976 command_status = FD_COMMAND_NONE;
1980 static void generic_done(int result)
1982 command_status = result;
1983 cont = &wakeup_cont;
1986 static void generic_success(void)
1991 static void generic_failure(void)
1996 static void success_and_wakeup(void)
2003 * formatting and rw support.
2004 * ==========================
2007 static int next_valid_format(void)
2011 probed_format = DRS->probed_format;
2013 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2014 DRS->probed_format = 0;
2017 if (floppy_type[DP->autodetect[probed_format]].sect) {
2018 DRS->probed_format = probed_format;
2025 static void bad_flp_intr(void)
2030 DRS->probed_format++;
2031 if (!next_valid_format())
2034 err_count = ++(*errors);
2035 INFBOUND(DRWE->badness, err_count);
2036 if (err_count > DP->max_errors.abort)
2038 if (err_count > DP->max_errors.reset)
2040 else if (err_count > DP->max_errors.recal)
2041 DRS->track = NEED_2_RECAL;
2044 static void set_floppy(int drive)
2046 int type = ITYPE(UDRS->fd_device);
2049 _floppy = floppy_type + type;
2051 _floppy = current_type[drive];
2055 * formatting support.
2056 * ===================
2058 static void format_interrupt(void)
2060 switch (interpret_errors()) {
2071 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2072 #define CT(x) ((x) | 0xc0)
2074 static void setup_format_params(int track)
2082 unsigned char track, head, sect, size;
2083 } *here = (struct fparm *)floppy_track_buffer;
2085 raw_cmd = &default_raw_cmd;
2086 raw_cmd->track = track;
2088 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2089 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2090 raw_cmd->rate = _floppy->rate & 0x43;
2091 raw_cmd->cmd_count = NR_F;
2092 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2093 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2094 F_SIZECODE = FD_SIZECODE(_floppy);
2095 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2096 F_GAP = _floppy->fmt_gap;
2097 F_FILL = FD_FILL_BYTE;
2099 raw_cmd->kernel_data = floppy_track_buffer;
2100 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2102 /* allow for about 30ms for data transport per track */
2103 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2105 /* a ``cylinder'' is two tracks plus a little stepping time */
2106 track_shift = 2 * head_shift + 3;
2108 /* position of logical sector 1 on this track */
2109 n = (track_shift * format_req.track + head_shift * format_req.head)
2112 /* determine interleave */
2114 if (_floppy->fmt_gap < 0x22)
2117 /* initialize field */
2118 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2119 here[count].track = format_req.track;
2120 here[count].head = format_req.head;
2121 here[count].sect = 0;
2122 here[count].size = F_SIZECODE;
2124 /* place logical sectors */
2125 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2126 here[n].sect = count;
2127 n = (n + il) % F_SECT_PER_TRACK;
2128 if (here[n].sect) { /* sector busy, find next free sector */
2130 if (n >= F_SECT_PER_TRACK) {
2131 n -= F_SECT_PER_TRACK;
2132 while (here[n].sect)
2137 if (_floppy->stretch & FD_SECTBASEMASK) {
2138 for (count = 0; count < F_SECT_PER_TRACK; count++)
2139 here[count].sect += FD_SECTBASE(_floppy) - 1;
2143 static void redo_format(void)
2146 setup_format_params(format_req.track << STRETCH(_floppy));
2148 debugt(__func__, "queue format request");
2151 static const struct cont_t format_cont = {
2152 .interrupt = format_interrupt,
2153 .redo = redo_format,
2154 .error = bad_flp_intr,
2155 .done = generic_done
2158 static int do_format(int drive, struct format_descr *tmp_format_req)
2162 if (lock_fdc(drive, true))
2167 _floppy->track > DP->tracks ||
2168 tmp_format_req->track >= _floppy->track ||
2169 tmp_format_req->head >= _floppy->head ||
2170 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2171 !_floppy->fmt_gap) {
2172 process_fd_request();
2175 format_req = *tmp_format_req;
2177 cont = &format_cont;
2178 errors = &format_errors;
2179 ret = wait_til_done(redo_format, true);
2182 process_fd_request();
2187 * Buffer read/write and support
2188 * =============================
2191 static void floppy_end_request(struct request *req, int error)
2193 unsigned int nr_sectors = current_count_sectors;
2194 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2196 /* current_count_sectors can be zero if transfer failed */
2198 nr_sectors = blk_rq_cur_sectors(req);
2199 if (__blk_end_request(req, error, nr_sectors << 9))
2202 /* We're done with the request */
2207 /* new request_done. Can handle physical sectors which are smaller than a
2209 static void request_done(int uptodate)
2211 struct request *req = current_req;
2212 struct request_queue *q;
2213 unsigned long flags;
2215 char msg[sizeof("request done ") + sizeof(int) * 3];
2218 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2219 reschedule_timeout(MAXTIMEOUT, msg);
2222 pr_info("floppy.c: no request in request_done\n");
2229 /* maintain values for invalidation on geometry
2231 block = current_count_sectors + blk_rq_pos(req);
2232 INFBOUND(DRS->maxblock, block);
2233 if (block > _floppy->sect)
2236 /* unlock chained buffers */
2237 spin_lock_irqsave(q->queue_lock, flags);
2238 floppy_end_request(req, 0);
2239 spin_unlock_irqrestore(q->queue_lock, flags);
2241 if (rq_data_dir(req) == WRITE) {
2242 /* record write error information */
2243 DRWE->write_errors++;
2244 if (DRWE->write_errors == 1) {
2245 DRWE->first_error_sector = blk_rq_pos(req);
2246 DRWE->first_error_generation = DRS->generation;
2248 DRWE->last_error_sector = blk_rq_pos(req);
2249 DRWE->last_error_generation = DRS->generation;
2251 spin_lock_irqsave(q->queue_lock, flags);
2252 floppy_end_request(req, -EIO);
2253 spin_unlock_irqrestore(q->queue_lock, flags);
2257 /* Interrupt handler evaluating the result of the r/w operation */
2258 static void rw_interrupt(void)
2266 /* some Toshiba floppy controllers occasionnally seem to
2267 * return bogus interrupts after read/write operations, which
2268 * can be recognized by a bad head number (>= 2) */
2272 if (!DRS->first_read_date)
2273 DRS->first_read_date = jiffies;
2276 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2288 nr_sectors = (((R_TRACK - TRACK) * heads +
2289 R_HEAD - HEAD) * SECT_PER_TRACK +
2290 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2292 if (nr_sectors / ssize >
2293 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2294 DPRINT("long rw: %x instead of %lx\n",
2295 nr_sectors, current_count_sectors);
2296 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2297 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2298 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2299 pr_info("heads=%d eoc=%d\n", heads, eoc);
2300 pr_info("spt=%d st=%d ss=%d\n",
2301 SECT_PER_TRACK, fsector_t, ssize);
2302 pr_info("in_sector_offset=%d\n", in_sector_offset);
2305 nr_sectors -= in_sector_offset;
2306 INFBOUND(nr_sectors, 0);
2307 SUPBOUND(current_count_sectors, nr_sectors);
2309 switch (interpret_errors()) {
2314 if (!current_count_sectors) {
2321 if (!current_count_sectors) {
2325 current_type[current_drive] = _floppy;
2326 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2331 if (DP->flags & FTD_MSG)
2332 DPRINT("Auto-detected floppy type %s in fd%d\n",
2333 _floppy->name, current_drive);
2334 current_type[current_drive] = _floppy;
2335 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2339 if (CT(COMMAND) != FD_READ ||
2340 raw_cmd->kernel_data == current_req->buffer) {
2341 /* transfer directly from buffer */
2343 } else if (CT(COMMAND) == FD_READ) {
2344 buffer_track = raw_cmd->track;
2345 buffer_drive = current_drive;
2346 INFBOUND(buffer_max, nr_sectors + fsector_t);
2351 /* Compute maximal contiguous buffer size. */
2352 static int buffer_chain_size(void)
2356 struct req_iterator iter;
2359 base = bio_data(current_req->bio);
2362 rq_for_each_segment(bv, current_req, iter) {
2363 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2372 /* Compute the maximal transfer size */
2373 static int transfer_size(int ssize, int max_sector, int max_size)
2375 SUPBOUND(max_sector, fsector_t + max_size);
2378 max_sector -= (max_sector % _floppy->sect) % ssize;
2380 /* transfer size, beginning not aligned */
2381 current_count_sectors = max_sector - fsector_t;
2387 * Move data from/to the track buffer to/from the buffer cache.
2389 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2391 int remaining; /* number of transferred 512-byte sectors */
2396 struct req_iterator iter;
2398 max_sector = transfer_size(ssize,
2399 min(max_sector, max_sector_2),
2400 blk_rq_sectors(current_req));
2402 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2403 buffer_max > fsector_t + blk_rq_sectors(current_req))
2404 current_count_sectors = min_t(int, buffer_max - fsector_t,
2405 blk_rq_sectors(current_req));
2407 remaining = current_count_sectors << 9;
2408 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2409 DPRINT("in copy buffer\n");
2410 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2411 pr_info("remaining=%d\n", remaining >> 9);
2412 pr_info("current_req->nr_sectors=%u\n",
2413 blk_rq_sectors(current_req));
2414 pr_info("current_req->current_nr_sectors=%u\n",
2415 blk_rq_cur_sectors(current_req));
2416 pr_info("max_sector=%d\n", max_sector);
2417 pr_info("ssize=%d\n", ssize);
2420 buffer_max = max(max_sector, buffer_max);
2422 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2424 size = blk_rq_cur_bytes(current_req);
2426 rq_for_each_segment(bv, current_req, iter) {
2431 SUPBOUND(size, remaining);
2433 buffer = page_address(bv->bv_page) + bv->bv_offset;
2434 if (dma_buffer + size >
2435 floppy_track_buffer + (max_buffer_sectors << 10) ||
2436 dma_buffer < floppy_track_buffer) {
2437 DPRINT("buffer overrun in copy buffer %d\n",
2438 (int)((floppy_track_buffer - dma_buffer) >> 9));
2439 pr_info("fsector_t=%d buffer_min=%d\n",
2440 fsector_t, buffer_min);
2441 pr_info("current_count_sectors=%ld\n",
2442 current_count_sectors);
2443 if (CT(COMMAND) == FD_READ)
2445 if (CT(COMMAND) == FD_WRITE)
2449 if (((unsigned long)buffer) % 512)
2450 DPRINT("%p buffer not aligned\n", buffer);
2452 if (CT(COMMAND) == FD_READ)
2453 memcpy(buffer, dma_buffer, size);
2455 memcpy(dma_buffer, buffer, size);
2462 max_sector -= remaining >> 9;
2463 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2467 /* work around a bug in pseudo DMA
2468 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2469 * sending data. Hence we need a different way to signal the
2470 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2471 * does not work with MT, hence we can only transfer one head at
2474 static void virtualdmabug_workaround(void)
2479 if (CT(COMMAND) == FD_WRITE) {
2480 COMMAND &= ~0x80; /* switch off multiple track mode */
2482 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2483 end_sector = SECTOR + hard_sectors - 1;
2484 if (end_sector > SECT_PER_TRACK) {
2485 pr_info("too many sectors %d > %d\n",
2486 end_sector, SECT_PER_TRACK);
2489 SECT_PER_TRACK = end_sector;
2490 /* make sure SECT_PER_TRACK
2491 * points to end of transfer */
2496 * Formulate a read/write request.
2497 * this routine decides where to load the data (directly to buffer, or to
2498 * tmp floppy area), how much data to load (the size of the buffer, the whole
2499 * track, or a single sector)
2500 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2501 * allocation on the fly, it should be done here. No other part should need
2505 static int make_raw_rw_request(void)
2507 int aligned_sector_t;
2513 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2516 set_fdc((long)current_req->rq_disk->private_data);
2518 raw_cmd = &default_raw_cmd;
2519 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2521 raw_cmd->cmd_count = NR_RW;
2522 if (rq_data_dir(current_req) == READ) {
2523 raw_cmd->flags |= FD_RAW_READ;
2524 COMMAND = FM_MODE(_floppy, FD_READ);
2525 } else if (rq_data_dir(current_req) == WRITE) {
2526 raw_cmd->flags |= FD_RAW_WRITE;
2527 COMMAND = FM_MODE(_floppy, FD_WRITE);
2529 DPRINT("%s: unknown command\n", __func__);
2533 max_sector = _floppy->sect * _floppy->head;
2535 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2536 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2537 if (_floppy->track && TRACK >= _floppy->track) {
2538 if (blk_rq_cur_sectors(current_req) & 1) {
2539 current_count_sectors = 1;
2544 HEAD = fsector_t / _floppy->sect;
2546 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2547 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2548 fsector_t < _floppy->sect)
2549 max_sector = _floppy->sect;
2551 /* 2M disks have phantom sectors on the first track */
2552 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2553 max_sector = 2 * _floppy->sect / 3;
2554 if (fsector_t >= max_sector) {
2555 current_count_sectors =
2556 min_t(int, _floppy->sect - fsector_t,
2557 blk_rq_sectors(current_req));
2562 SIZECODE = FD_SIZECODE(_floppy);
2563 raw_cmd->rate = _floppy->rate & 0x43;
2564 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2571 raw_cmd->track = TRACK << STRETCH(_floppy);
2572 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2574 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2575 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2576 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2577 FD_SECTBASE(_floppy);
2579 /* tracksize describes the size which can be filled up with sectors
2582 tracksize = _floppy->sect - _floppy->sect % ssize;
2583 if (tracksize < _floppy->sect) {
2585 if (tracksize <= fsector_t % _floppy->sect)
2588 /* if we are beyond tracksize, fill up using smaller sectors */
2589 while (tracksize <= fsector_t % _floppy->sect) {
2590 while (tracksize + ssize > _floppy->sect) {
2598 max_sector = HEAD * _floppy->sect + tracksize;
2599 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2600 max_sector = _floppy->sect;
2601 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2602 /* for virtual DMA bug workaround */
2603 max_sector = _floppy->sect;
2606 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2607 aligned_sector_t = fsector_t - in_sector_offset;
2608 max_size = blk_rq_sectors(current_req);
2609 if ((raw_cmd->track == buffer_track) &&
2610 (current_drive == buffer_drive) &&
2611 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2612 /* data already in track buffer */
2613 if (CT(COMMAND) == FD_READ) {
2614 copy_buffer(1, max_sector, buffer_max);
2617 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2618 if (CT(COMMAND) == FD_WRITE) {
2619 unsigned int sectors;
2621 sectors = fsector_t + blk_rq_sectors(current_req);
2622 if (sectors > ssize && sectors < ssize + ssize)
2623 max_size = ssize + ssize;
2627 raw_cmd->flags &= ~FD_RAW_WRITE;
2628 raw_cmd->flags |= FD_RAW_READ;
2629 COMMAND = FM_MODE(_floppy, FD_READ);
2630 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2631 unsigned long dma_limit;
2632 int direct, indirect;
2635 transfer_size(ssize, max_sector,
2636 max_buffer_sectors * 2) - fsector_t;
2639 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2640 * on a 64 bit machine!
2642 max_size = buffer_chain_size();
2643 dma_limit = (MAX_DMA_ADDRESS -
2644 ((unsigned long)current_req->buffer)) >> 9;
2645 if ((unsigned long)max_size > dma_limit)
2646 max_size = dma_limit;
2647 /* 64 kb boundaries */
2648 if (CROSS_64KB(current_req->buffer, max_size << 9))
2650 ((unsigned long)current_req->buffer) %
2652 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2654 * We try to read tracks, but if we get too many errors, we
2655 * go back to reading just one sector at a time.
2657 * This means we should be able to read a sector even if there
2658 * are other bad sectors on this track.
2661 (indirect * 2 > direct * 3 &&
2662 *errors < DP->max_errors.read_track &&
2664 (DP->read_track & (1 << DRS->probed_format)))))) {
2665 max_size = blk_rq_sectors(current_req);
2667 raw_cmd->kernel_data = current_req->buffer;
2668 raw_cmd->length = current_count_sectors << 9;
2669 if (raw_cmd->length == 0) {
2670 DPRINT("%s: zero dma transfer attempted\n", __func__);
2671 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2672 indirect, direct, fsector_t);
2675 virtualdmabug_workaround();
2680 if (CT(COMMAND) == FD_READ)
2681 max_size = max_sector; /* unbounded */
2683 /* claim buffer track if needed */
2684 if (buffer_track != raw_cmd->track || /* bad track */
2685 buffer_drive != current_drive || /* bad drive */
2686 fsector_t > buffer_max ||
2687 fsector_t < buffer_min ||
2688 ((CT(COMMAND) == FD_READ ||
2689 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2690 max_sector > 2 * max_buffer_sectors + buffer_min &&
2691 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2692 /* not enough space */
2694 buffer_drive = current_drive;
2695 buffer_max = buffer_min = aligned_sector_t;
2697 raw_cmd->kernel_data = floppy_track_buffer +
2698 ((aligned_sector_t - buffer_min) << 9);
2700 if (CT(COMMAND) == FD_WRITE) {
2701 /* copy write buffer to track buffer.
2702 * if we get here, we know that the write
2703 * is either aligned or the data already in the buffer
2704 * (buffer will be overwritten) */
2705 if (in_sector_offset && buffer_track == -1)
2706 DPRINT("internal error offset !=0 on write\n");
2707 buffer_track = raw_cmd->track;
2708 buffer_drive = current_drive;
2709 copy_buffer(ssize, max_sector,
2710 2 * max_buffer_sectors + buffer_min);
2712 transfer_size(ssize, max_sector,
2713 2 * max_buffer_sectors + buffer_min -
2716 /* round up current_count_sectors to get dma xfer size */
2717 raw_cmd->length = in_sector_offset + current_count_sectors;
2718 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2719 raw_cmd->length <<= 9;
2720 if ((raw_cmd->length < current_count_sectors << 9) ||
2721 (raw_cmd->kernel_data != current_req->buffer &&
2722 CT(COMMAND) == FD_WRITE &&
2723 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2724 aligned_sector_t < buffer_min)) ||
2725 raw_cmd->length % (128 << SIZECODE) ||
2726 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2727 DPRINT("fractionary current count b=%lx s=%lx\n",
2728 raw_cmd->length, current_count_sectors);
2729 if (raw_cmd->kernel_data != current_req->buffer)
2730 pr_info("addr=%d, length=%ld\n",
2731 (int)((raw_cmd->kernel_data -
2732 floppy_track_buffer) >> 9),
2733 current_count_sectors);
2734 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2735 fsector_t, aligned_sector_t, max_sector, max_size);
2736 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2737 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2738 COMMAND, SECTOR, HEAD, TRACK);
2739 pr_info("buffer drive=%d\n", buffer_drive);
2740 pr_info("buffer track=%d\n", buffer_track);
2741 pr_info("buffer_min=%d\n", buffer_min);
2742 pr_info("buffer_max=%d\n", buffer_max);
2746 if (raw_cmd->kernel_data != current_req->buffer) {
2747 if (raw_cmd->kernel_data < floppy_track_buffer ||
2748 current_count_sectors < 0 ||
2749 raw_cmd->length < 0 ||
2750 raw_cmd->kernel_data + raw_cmd->length >
2751 floppy_track_buffer + (max_buffer_sectors << 10)) {
2752 DPRINT("buffer overrun in schedule dma\n");
2753 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2754 fsector_t, buffer_min, raw_cmd->length >> 9);
2755 pr_info("current_count_sectors=%ld\n",
2756 current_count_sectors);
2757 if (CT(COMMAND) == FD_READ)
2759 if (CT(COMMAND) == FD_WRITE)
2763 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2764 current_count_sectors > blk_rq_sectors(current_req)) {
2765 DPRINT("buffer overrun in direct transfer\n");
2767 } else if (raw_cmd->length < current_count_sectors << 9) {
2768 DPRINT("more sectors than bytes\n");
2769 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2770 pr_info("sectors=%ld\n", current_count_sectors);
2772 if (raw_cmd->length == 0) {
2773 DPRINT("zero dma transfer attempted from make_raw_request\n");
2777 virtualdmabug_workaround();
2782 * Round-robin between our available drives, doing one request from each
2784 static int set_next_request(void)
2786 struct request_queue *q;
2787 int old_pos = fdc_queue;
2790 q = disks[fdc_queue]->queue;
2791 if (++fdc_queue == N_DRIVE)
2794 current_req = blk_fetch_request(q);
2798 } while (fdc_queue != old_pos);
2800 return current_req != NULL;
2803 static void redo_fd_request(void)
2809 if (current_drive < N_DRIVE)
2810 floppy_off(current_drive);
2816 spin_lock_irq(&floppy_lock);
2817 pending = set_next_request();
2818 spin_unlock_irq(&floppy_lock);
2825 drive = (long)current_req->rq_disk->private_data;
2827 reschedule_timeout(current_reqD, "redo fd request");
2830 raw_cmd = &default_raw_cmd;
2832 if (start_motor(redo_fd_request))
2835 disk_change(current_drive);
2836 if (test_bit(current_drive, &fake_change) ||
2837 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2838 DPRINT("disk absent or changed during operation\n");
2842 if (!_floppy) { /* Autodetection */
2844 DRS->probed_format = 0;
2845 if (next_valid_format()) {
2846 DPRINT("no autodetectable formats\n");
2853 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2856 errors = &(current_req->errors);
2857 tmp = make_raw_rw_request();
2863 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2865 schedule_bh(floppy_start);
2866 debugt(__func__, "queue fd request");
2870 static const struct cont_t rw_cont = {
2871 .interrupt = rw_interrupt,
2872 .redo = redo_fd_request,
2873 .error = bad_flp_intr,
2874 .done = request_done
2877 static void process_fd_request(void)
2880 schedule_bh(redo_fd_request);
2883 static void do_fd_request(struct request_queue *q)
2885 if (WARN(max_buffer_sectors == 0,
2886 "VFS: %s called on non-open device\n", __func__))
2889 if (WARN(atomic_read(&usage_count) == 0,
2890 "warning: usage count=0, current_req=%p sect=%ld type=%x flags=%x\n",
2891 current_req, (long)blk_rq_pos(current_req), current_req->cmd_type,
2892 current_req->cmd_flags))
2895 if (test_and_set_bit(0, &fdc_busy)) {
2896 /* fdc busy, this new request will be treated when the
2897 current one is done */
2898 is_alive(__func__, "old request running");
2901 command_status = FD_COMMAND_NONE;
2902 __reschedule_timeout(MAXTIMEOUT, "fd_request");
2904 process_fd_request();
2905 is_alive(__func__, "");
2908 static const struct cont_t poll_cont = {
2909 .interrupt = success_and_wakeup,
2910 .redo = floppy_ready,
2911 .error = generic_failure,
2912 .done = generic_done
2915 static int poll_drive(bool interruptible, int flag)
2917 /* no auto-sense, just clear dcl */
2918 raw_cmd = &default_raw_cmd;
2919 raw_cmd->flags = flag;
2921 raw_cmd->cmd_count = 0;
2923 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2924 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2926 return wait_til_done(floppy_ready, interruptible);
2930 * User triggered reset
2931 * ====================
2934 static void reset_intr(void)
2936 pr_info("weird, reset interrupt called\n");
2939 static const struct cont_t reset_cont = {
2940 .interrupt = reset_intr,
2941 .redo = success_and_wakeup,
2942 .error = generic_failure,
2943 .done = generic_done
2946 static int user_reset_fdc(int drive, int arg, bool interruptible)
2950 if (lock_fdc(drive, interruptible))
2953 if (arg == FD_RESET_ALWAYS)
2957 ret = wait_til_done(reset_fdc, interruptible);
2961 process_fd_request();
2966 * Misc Ioctl's and support
2967 * ========================
2969 static inline int fd_copyout(void __user *param, const void *address,
2972 return copy_to_user(param, address, size) ? -EFAULT : 0;
2975 static inline int fd_copyin(void __user *param, void *address,
2978 return copy_from_user(address, param, size) ? -EFAULT : 0;
2981 static const char *drive_name(int type, int drive)
2983 struct floppy_struct *floppy;
2986 floppy = floppy_type + type;
2988 if (UDP->native_format)
2989 floppy = floppy_type + UDP->native_format;
2994 return floppy->name;
3000 static void raw_cmd_done(int flag)
3005 raw_cmd->flags |= FD_RAW_FAILURE;
3006 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3008 raw_cmd->reply_count = inr;
3009 if (raw_cmd->reply_count > MAX_REPLIES)
3010 raw_cmd->reply_count = 0;
3011 for (i = 0; i < raw_cmd->reply_count; i++)
3012 raw_cmd->reply[i] = reply_buffer[i];
3014 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3015 unsigned long flags;
3016 flags = claim_dma_lock();
3017 raw_cmd->length = fd_get_dma_residue();
3018 release_dma_lock(flags);
3021 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3022 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3023 raw_cmd->flags |= FD_RAW_FAILURE;
3025 if (disk_change(current_drive))
3026 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3028 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3029 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3030 motor_off_callback(current_drive);
3032 if (raw_cmd->next &&
3033 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3034 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3035 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3036 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3037 raw_cmd = raw_cmd->next;
3044 static const struct cont_t raw_cmd_cont = {
3045 .interrupt = success_and_wakeup,
3046 .redo = floppy_start,
3047 .error = generic_failure,
3048 .done = raw_cmd_done
3051 static int raw_cmd_copyout(int cmd, void __user *param,
3052 struct floppy_raw_cmd *ptr)
3057 ret = copy_to_user(param, ptr, sizeof(*ptr));
3060 param += sizeof(struct floppy_raw_cmd);
3061 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3062 if (ptr->length >= 0 &&
3063 ptr->length <= ptr->buffer_length) {
3064 long length = ptr->buffer_length - ptr->length;
3065 ret = fd_copyout(ptr->data, ptr->kernel_data,
3077 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3079 struct floppy_raw_cmd *next;
3080 struct floppy_raw_cmd *this;
3085 if (this->buffer_length) {
3086 fd_dma_mem_free((unsigned long)this->kernel_data,
3087 this->buffer_length);
3088 this->buffer_length = 0;
3096 static int raw_cmd_copyin(int cmd, void __user *param,
3097 struct floppy_raw_cmd **rcmd)
3099 struct floppy_raw_cmd *ptr;
3106 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3110 ret = copy_from_user(ptr, param, sizeof(*ptr));
3114 ptr->buffer_length = 0;
3115 param += sizeof(struct floppy_raw_cmd);
3116 if (ptr->cmd_count > 33)
3117 /* the command may now also take up the space
3118 * initially intended for the reply & the
3119 * reply count. Needed for long 82078 commands
3120 * such as RESTORE, which takes ... 17 command
3121 * bytes. Murphy's law #137: When you reserve
3122 * 16 bytes for a structure, you'll one day
3123 * discover that you really need 17...
3127 for (i = 0; i < 16; i++)
3129 ptr->resultcode = 0;
3130 ptr->kernel_data = NULL;
3132 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3133 if (ptr->length <= 0)
3135 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3136 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3137 if (!ptr->kernel_data)
3139 ptr->buffer_length = ptr->length;
3141 if (ptr->flags & FD_RAW_WRITE) {
3142 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3147 if (ptr->flags & FD_RAW_MORE) {
3148 rcmd = &(ptr->next);
3156 static int raw_cmd_ioctl(int cmd, void __user *param)
3158 struct floppy_raw_cmd *my_raw_cmd;
3163 if (FDCS->rawcmd <= 1)
3165 for (drive = 0; drive < N_DRIVE; drive++) {
3166 if (FDC(drive) != fdc)
3168 if (drive == current_drive) {
3169 if (UDRS->fd_ref > 1) {
3173 } else if (UDRS->fd_ref) {
3182 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3184 raw_cmd_free(&my_raw_cmd);
3188 raw_cmd = my_raw_cmd;
3189 cont = &raw_cmd_cont;
3190 ret = wait_til_done(floppy_start, true);
3191 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3193 if (ret != -EINTR && FDCS->reset)
3196 DRS->track = NO_TRACK;
3198 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3201 raw_cmd_free(&my_raw_cmd);
3205 static int invalidate_drive(struct block_device *bdev)
3207 /* invalidate the buffer track to force a reread */
3208 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3209 process_fd_request();
3210 check_disk_change(bdev);
3214 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3215 int drive, int type, struct block_device *bdev)
3219 /* sanity checking for parameters. */
3222 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3223 /* check if reserved bits are set */
3224 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3227 if (!capable(CAP_SYS_ADMIN))
3229 mutex_lock(&open_lock);
3230 if (lock_fdc(drive, true)) {
3231 mutex_unlock(&open_lock);
3234 floppy_type[type] = *g;
3235 floppy_type[type].name = "user format";
3236 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3237 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3238 floppy_type[type].size + 1;
3239 process_fd_request();
3240 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3241 struct block_device *bdev = opened_bdev[cnt];
3242 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3244 __invalidate_device(bdev, true);
3246 mutex_unlock(&open_lock);
3250 if (lock_fdc(drive, true))
3252 if (cmd != FDDEFPRM) {
3253 /* notice a disk change immediately, else
3254 * we lose our settings immediately*/
3255 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3258 oldStretch = g->stretch;
3259 user_params[drive] = *g;
3260 if (buffer_drive == drive)
3261 SUPBOUND(buffer_max, user_params[drive].sect);
3262 current_type[drive] = &user_params[drive];
3263 floppy_sizes[drive] = user_params[drive].size;
3264 if (cmd == FDDEFPRM)
3265 DRS->keep_data = -1;
3268 /* invalidation. Invalidate only when needed, i.e.
3269 * when there are already sectors in the buffer cache
3270 * whose number will change. This is useful, because
3271 * mtools often changes the geometry of the disk after
3272 * looking at the boot block */
3273 if (DRS->maxblock > user_params[drive].sect ||
3275 ((user_params[drive].sect ^ oldStretch) &
3276 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3277 invalidate_drive(bdev);
3279 process_fd_request();
3284 /* handle obsolete ioctl's */
3285 static unsigned int ioctl_table[] = {
3313 static int normalize_ioctl(unsigned int *cmd, int *size)
3317 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3318 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3319 *size = _IOC_SIZE(*cmd);
3320 *cmd = ioctl_table[i];
3321 if (*size > _IOC_SIZE(*cmd)) {
3322 pr_info("ioctl not yet supported\n");
3331 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3334 *g = &floppy_type[type];
3336 if (lock_fdc(drive, false))
3338 if (poll_drive(false, 0) == -EINTR)
3340 process_fd_request();
3341 *g = current_type[drive];
3348 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3350 int drive = (long)bdev->bd_disk->private_data;
3351 int type = ITYPE(drive_state[drive].fd_device);
3352 struct floppy_struct *g;
3355 ret = get_floppy_geometry(drive, type, &g);
3359 geo->heads = g->head;
3360 geo->sectors = g->sect;
3361 geo->cylinders = g->track;
3365 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3366 unsigned long param)
3368 int drive = (long)bdev->bd_disk->private_data;
3369 int type = ITYPE(UDRS->fd_device);
3374 struct floppy_struct g; /* geometry */
3375 struct format_descr f;
3376 struct floppy_max_errors max_errors;
3377 struct floppy_drive_params dp;
3378 } inparam; /* parameters coming from user space */
3379 const void *outparam; /* parameters passed back to user space */
3381 /* convert compatibility eject ioctls into floppy eject ioctl.
3382 * We do this in order to provide a means to eject floppy disks before
3383 * installing the new fdutils package */
3384 if (cmd == CDROMEJECT || /* CD-ROM eject */
3385 cmd == 0x6470) { /* SunOS floppy eject */
3386 DPRINT("obsolete eject ioctl\n");
3387 DPRINT("please use floppycontrol --eject\n");
3391 if (!((cmd & 0xff00) == 0x0200))
3394 /* convert the old style command into a new style command */
3395 ret = normalize_ioctl(&cmd, &size);
3399 /* permission checks */
3400 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3401 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3404 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3408 memset(&inparam, 0, sizeof(inparam));
3409 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3410 ret = fd_copyin((void __user *)param, &inparam, size);
3417 if (UDRS->fd_ref != 1)
3418 /* somebody else has this drive open */
3420 if (lock_fdc(drive, true))
3423 /* do the actual eject. Fails on
3424 * non-Sparc architectures */
3425 ret = fd_eject(UNIT(drive));
3427 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3428 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3429 process_fd_request();
3432 if (lock_fdc(drive, true))
3434 current_type[drive] = NULL;
3435 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3436 UDRS->keep_data = 0;
3437 return invalidate_drive(bdev);
3440 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3442 ret = get_floppy_geometry(drive, type,
3443 (struct floppy_struct **)&outparam);
3448 UDP->flags |= FTD_MSG;
3451 UDP->flags &= ~FTD_MSG;
3454 if (lock_fdc(drive, true))
3456 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3459 process_fd_request();
3460 if (ret & FD_VERIFY)
3462 if (!(ret & FD_DISK_WRITABLE))
3466 if (UDRS->fd_ref != 1)
3468 return do_format(drive, &inparam.f);
3471 if (lock_fdc(drive, true))
3473 return invalidate_drive(bdev);
3474 case FDSETEMSGTRESH:
3475 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3478 outparam = &UDP->max_errors;
3481 UDP->max_errors = inparam.max_errors;
3484 outparam = drive_name(type, drive);
3485 SUPBOUND(size, strlen((const char *)outparam) + 1);
3494 if (lock_fdc(drive, true))
3496 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3498 process_fd_request();
3504 return user_reset_fdc(drive, (int)param, true);
3509 memset(UDRWE, 0, sizeof(*UDRWE));
3517 if (lock_fdc(drive, true))
3520 i = raw_cmd_ioctl(cmd, (void __user *)param);
3523 process_fd_request();
3526 if (lock_fdc(drive, true))
3529 process_fd_request();
3535 if (_IOC_DIR(cmd) & _IOC_READ)
3536 return fd_copyout((void __user *)param, outparam, size);
3541 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3542 unsigned int cmd, unsigned long param)
3546 mutex_lock(&floppy_mutex);
3547 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3548 mutex_unlock(&floppy_mutex);
3553 static void __init config_types(void)
3555 bool has_drive = false;
3558 /* read drive info out of physical CMOS */
3561 UDP->cmos = FLOPPY0_TYPE;
3563 if (!UDP->cmos && FLOPPY1_TYPE)
3564 UDP->cmos = FLOPPY1_TYPE;
3566 /* FIXME: additional physical CMOS drive detection should go here */
3568 for (drive = 0; drive < N_DRIVE; drive++) {
3569 unsigned int type = UDP->cmos;
3570 struct floppy_drive_params *params;
3571 const char *name = NULL;
3572 static char temparea[32];
3574 if (type < ARRAY_SIZE(default_drive_params)) {
3575 params = &default_drive_params[type].params;
3577 name = default_drive_params[type].name;
3578 allowed_drive_mask |= 1 << drive;
3580 allowed_drive_mask &= ~(1 << drive);
3582 params = &default_drive_params[0].params;
3583 sprintf(temparea, "unknown type %d (usb?)", type);
3587 const char *prepend;
3591 pr_info("Floppy drive(s):");
3596 pr_cont("%s fd%d is %s", prepend, drive, name);
3605 static int floppy_release(struct gendisk *disk, fmode_t mode)
3607 int drive = (long)disk->private_data;
3609 mutex_lock(&floppy_mutex);
3610 mutex_lock(&open_lock);
3611 if (!UDRS->fd_ref--) {
3612 DPRINT("floppy_release with fd_ref == 0");
3616 opened_bdev[drive] = NULL;
3617 mutex_unlock(&open_lock);
3618 mutex_unlock(&floppy_mutex);
3624 * floppy_open check for aliasing (/dev/fd0 can be the same as
3625 * /dev/PS0 etc), and disallows simultaneous access to the same
3626 * drive with different device numbers.
3628 static int floppy_open(struct block_device *bdev, fmode_t mode)
3630 int drive = (long)bdev->bd_disk->private_data;
3631 int old_dev, new_dev;
3636 mutex_lock(&floppy_mutex);
3637 mutex_lock(&open_lock);
3638 old_dev = UDRS->fd_device;
3639 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3642 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3643 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3644 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3649 opened_bdev[drive] = bdev;
3653 if (!floppy_track_buffer) {
3654 /* if opening an ED drive, reserve a big buffer,
3655 * else reserve a small one */
3656 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3657 try = 64; /* Only 48 actually useful */
3659 try = 32; /* Only 24 actually useful */
3661 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3662 if (!tmp && !floppy_track_buffer) {
3663 try >>= 1; /* buffer only one side */
3665 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3667 if (!tmp && !floppy_track_buffer)
3668 fallback_on_nodma_alloc(&tmp, 2048 * try);
3669 if (!tmp && !floppy_track_buffer) {
3670 DPRINT("Unable to allocate DMA memory\n");
3673 if (floppy_track_buffer) {
3675 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3677 buffer_min = buffer_max = -1;
3678 floppy_track_buffer = tmp;
3679 max_buffer_sectors = try;
3683 new_dev = MINOR(bdev->bd_dev);
3684 UDRS->fd_device = new_dev;
3685 set_capacity(disks[drive], floppy_sizes[new_dev]);
3686 if (old_dev != -1 && old_dev != new_dev) {
3687 if (buffer_drive == drive)
3691 if (UFDCS->rawcmd == 1)
3694 if (!(mode & FMODE_NDELAY)) {
3695 if (mode & (FMODE_READ|FMODE_WRITE)) {
3696 UDRS->last_checked = 0;
3697 check_disk_change(bdev);
3698 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
3702 if ((mode & FMODE_WRITE) &&
3703 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
3706 mutex_unlock(&open_lock);
3707 mutex_unlock(&floppy_mutex);
3713 opened_bdev[drive] = NULL;
3715 mutex_unlock(&open_lock);
3716 mutex_unlock(&floppy_mutex);
3721 * Check if the disk has been changed or if a change has been faked.
3723 static unsigned int floppy_check_events(struct gendisk *disk,
3724 unsigned int clearing)
3726 int drive = (long)disk->private_data;
3728 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3729 test_bit(FD_VERIFY_BIT, &UDRS->flags))
3730 return DISK_EVENT_MEDIA_CHANGE;
3732 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3733 lock_fdc(drive, false);
3734 poll_drive(false, 0);
3735 process_fd_request();
3738 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3739 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3740 test_bit(drive, &fake_change) ||
3741 drive_no_geom(drive))
3742 return DISK_EVENT_MEDIA_CHANGE;
3747 * This implements "read block 0" for floppy_revalidate().
3748 * Needed for format autodetection, checking whether there is
3749 * a disk in the drive, and whether that disk is writable.
3752 static void floppy_rb0_complete(struct bio *bio, int err)
3754 complete((struct completion *)bio->bi_private);
3757 static int __floppy_read_block_0(struct block_device *bdev)
3760 struct bio_vec bio_vec;
3761 struct completion complete;
3765 page = alloc_page(GFP_NOIO);
3767 process_fd_request();
3771 size = bdev->bd_block_size;
3776 bio.bi_io_vec = &bio_vec;
3777 bio_vec.bv_page = page;
3778 bio_vec.bv_len = size;
3779 bio_vec.bv_offset = 0;
3785 bio.bi_flags = (1 << BIO_QUIET);
3786 init_completion(&complete);
3787 bio.bi_private = &complete;
3788 bio.bi_end_io = floppy_rb0_complete;
3790 submit_bio(READ, &bio);
3791 process_fd_request();
3792 wait_for_completion(&complete);
3799 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3800 * the bootblock (block 0). "Autodetection" is also needed to check whether
3801 * there is a disk in the drive at all... Thus we also do it for fixed
3802 * geometry formats */
3803 static int floppy_revalidate(struct gendisk *disk)
3805 int drive = (long)disk->private_data;
3809 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3810 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3811 test_bit(drive, &fake_change) ||
3812 drive_no_geom(drive)) {
3813 if (WARN(atomic_read(&usage_count) == 0,
3814 "VFS: revalidate called on non-open device.\n"))
3817 lock_fdc(drive, false);
3818 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3819 test_bit(FD_VERIFY_BIT, &UDRS->flags));
3820 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
3821 process_fd_request(); /*already done by another thread */
3826 if (buffer_drive == drive)
3828 clear_bit(drive, &fake_change);
3829 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3832 if (drive_no_geom(drive)) {
3834 res = __floppy_read_block_0(opened_bdev[drive]);
3837 poll_drive(false, FD_RAW_NEED_DISK);
3838 process_fd_request();
3841 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3845 static const struct block_device_operations floppy_fops = {
3846 .owner = THIS_MODULE,
3847 .open = floppy_open,
3848 .release = floppy_release,
3850 .getgeo = fd_getgeo,
3851 .check_events = floppy_check_events,
3852 .revalidate_disk = floppy_revalidate,
3856 * Floppy Driver initialization
3857 * =============================
3860 /* Determine the floppy disk controller type */
3861 /* This routine was written by David C. Niemi */
3862 static char __init get_fdc_version(void)
3866 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
3871 return FDC_NONE; /* No FDC present ??? */
3872 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3873 pr_info("FDC %d is an 8272A\n", fdc);
3874 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
3877 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3882 if (!fdc_configure()) {
3883 pr_info("FDC %d is an 82072\n", fdc);
3884 return FDC_82072; /* 82072 doesn't know CONFIGURE */
3887 output_byte(FD_PERPENDICULAR);
3888 if (need_more_output() == MORE_OUTPUT) {
3891 pr_info("FDC %d is an 82072A\n", fdc);
3892 return FDC_82072A; /* 82072A as found on Sparcs. */
3895 output_byte(FD_UNLOCK);
3897 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3898 pr_info("FDC %d is a pre-1991 82077\n", fdc);
3899 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
3902 if ((r != 1) || (reply_buffer[0] != 0x00)) {
3903 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3907 output_byte(FD_PARTID);
3910 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3914 if (reply_buffer[0] == 0x80) {
3915 pr_info("FDC %d is a post-1991 82077\n", fdc);
3916 return FDC_82077; /* Revised 82077AA passes all the tests */
3918 switch (reply_buffer[0] >> 5) {
3920 /* Either a 82078-1 or a 82078SL running at 5Volt */
3921 pr_info("FDC %d is an 82078.\n", fdc);
3924 pr_info("FDC %d is a 44pin 82078\n", fdc);
3927 pr_info("FDC %d is a S82078B\n", fdc);
3930 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
3933 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
3934 fdc, reply_buffer[0] >> 5);
3935 return FDC_82078_UNKN;
3937 } /* get_fdc_version */
3939 /* lilo configuration */
3941 static void __init floppy_set_flags(int *ints, int param, int param2)
3945 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3947 default_drive_params[i].params.flags |= param2;
3949 default_drive_params[i].params.flags &= ~param2;
3951 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
3954 static void __init daring(int *ints, int param, int param2)
3958 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3960 default_drive_params[i].params.select_delay = 0;
3961 default_drive_params[i].params.flags |=
3962 FD_SILENT_DCL_CLEAR;
3964 default_drive_params[i].params.select_delay =
3966 default_drive_params[i].params.flags &=
3967 ~FD_SILENT_DCL_CLEAR;
3970 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3973 static void __init set_cmos(int *ints, int dummy, int dummy2)
3975 int current_drive = 0;
3978 DPRINT("wrong number of parameters for CMOS\n");
3981 current_drive = ints[1];
3982 if (current_drive < 0 || current_drive >= 8) {
3983 DPRINT("bad drive for set_cmos\n");
3987 if (current_drive >= 4 && !FDC2)
3991 DPRINT("setting CMOS code to %d\n", ints[2]);
3994 static struct param_table {
3996 void (*fn) (int *ints, int param, int param2);
4000 } config_params[] __initdata = {
4001 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4002 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4003 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4004 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4005 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4006 {"daring", daring, NULL, 1, 0},
4008 {"two_fdc", NULL, &FDC2, 0x370, 0},
4009 {"one_fdc", NULL, &FDC2, 0, 0},
4011 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4012 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4013 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4014 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4015 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4016 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4017 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4018 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4019 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4020 {"nofifo", NULL, &no_fifo, 0x20, 0},
4021 {"usefifo", NULL, &no_fifo, 0, 0},
4022 {"cmos", set_cmos, NULL, 0, 0},
4023 {"slow", NULL, &slow_floppy, 1, 0},
4024 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4025 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4026 {"L40SX", NULL, &print_unex, 0, 0}
4031 static int __init floppy_setup(char *str)
4037 str = get_options(str, ARRAY_SIZE(ints), ints);
4039 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4040 if (strcmp(str, config_params[i].name) == 0) {
4044 param = config_params[i].def_param;
4045 if (config_params[i].fn)
4046 config_params[i].fn(ints, param,
4049 if (config_params[i].var) {
4050 DPRINT("%s=%d\n", str, param);
4051 *config_params[i].var = param;
4058 DPRINT("unknown floppy option [%s]\n", str);
4060 DPRINT("allowed options are:");
4061 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4062 pr_cont(" %s", config_params[i].name);
4065 DPRINT("botched floppy option\n");
4066 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4070 static int have_no_fdc = -ENODEV;
4072 static ssize_t floppy_cmos_show(struct device *dev,
4073 struct device_attribute *attr, char *buf)
4075 struct platform_device *p = to_platform_device(dev);
4079 return sprintf(buf, "%X\n", UDP->cmos);
4082 static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4084 static void floppy_device_release(struct device *dev)
4088 static int floppy_resume(struct device *dev)
4092 for (fdc = 0; fdc < N_FDC; fdc++)
4093 if (FDCS->address != -1)
4094 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4099 static const struct dev_pm_ops floppy_pm_ops = {
4100 .resume = floppy_resume,
4101 .restore = floppy_resume,
4104 static struct platform_driver floppy_driver = {
4107 .pm = &floppy_pm_ops,
4111 static struct platform_device floppy_device[N_DRIVE];
4113 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4115 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4116 if (drive >= N_DRIVE ||
4117 !(allowed_drive_mask & (1 << drive)) ||
4118 fdc_state[FDC(drive)].version == FDC_NONE)
4120 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4123 return get_disk(disks[drive]);
4126 static int __init do_floppy_init(void)
4132 interruptjiffies = resultjiffies = jiffies;
4134 #if defined(CONFIG_PPC)
4135 if (check_legacy_ioport(FDC1))
4141 for (dr = 0; dr < N_DRIVE; dr++) {
4142 disks[dr] = alloc_disk(1);
4148 floppy_wq = alloc_ordered_workqueue("floppy", 0);
4154 disks[dr]->queue = blk_init_queue(do_fd_request, &floppy_lock);
4155 if (!disks[dr]->queue) {
4157 goto out_destroy_workq;
4160 blk_queue_max_hw_sectors(disks[dr]->queue, 64);
4161 disks[dr]->major = FLOPPY_MAJOR;
4162 disks[dr]->first_minor = TOMINOR(dr);
4163 disks[dr]->fops = &floppy_fops;
4164 sprintf(disks[dr]->disk_name, "fd%d", dr);
4166 init_timer(&motor_off_timer[dr]);
4167 motor_off_timer[dr].data = dr;
4168 motor_off_timer[dr].function = motor_off_callback;
4171 err = register_blkdev(FLOPPY_MAJOR, "fd");
4175 err = platform_driver_register(&floppy_driver);
4177 goto out_unreg_blkdev;
4179 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4180 floppy_find, NULL, NULL);
4182 for (i = 0; i < 256; i++)
4184 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4186 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4188 reschedule_timeout(MAXTIMEOUT, "floppy init");
4191 for (i = 0; i < N_FDC; i++) {
4193 memset(FDCS, 0, sizeof(*FDCS));
4196 #if defined(__sparc__) || defined(__mc68000__)
4197 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4201 FDCS->version = FDC_82072A;
4205 use_virtual_dma = can_use_virtual_dma & 1;
4206 fdc_state[0].address = FDC1;
4207 if (fdc_state[0].address == -1) {
4208 cancel_delayed_work(&fd_timeout);
4210 goto out_unreg_region;
4213 fdc_state[1].address = FDC2;
4216 fdc = 0; /* reset fdc in case of unexpected interrupt */
4217 err = floppy_grab_irq_and_dma();
4219 cancel_delayed_work(&fd_timeout);
4221 goto out_unreg_region;
4224 /* initialise drive state */
4225 for (drive = 0; drive < N_DRIVE; drive++) {
4226 memset(UDRS, 0, sizeof(*UDRS));
4227 memset(UDRWE, 0, sizeof(*UDRWE));
4228 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4229 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4230 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4231 UDRS->fd_device = -1;
4232 floppy_track_buffer = NULL;
4233 max_buffer_sectors = 0;
4236 * Small 10 msec delay to let through any interrupt that
4237 * initialization might have triggered, to not
4238 * confuse detection:
4242 for (i = 0; i < N_FDC; i++) {
4244 FDCS->driver_version = FD_DRIVER_VERSION;
4245 for (unit = 0; unit < 4; unit++)
4246 FDCS->track[unit] = 0;
4247 if (FDCS->address == -1)
4250 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4251 /* free ioports reserved by floppy_grab_irq_and_dma() */
4252 floppy_release_regions(fdc);
4254 FDCS->version = FDC_NONE;
4257 /* Try to determine the floppy controller type */
4258 FDCS->version = get_fdc_version();
4259 if (FDCS->version == FDC_NONE) {
4260 /* free ioports reserved by floppy_grab_irq_and_dma() */
4261 floppy_release_regions(fdc);
4265 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4266 can_use_virtual_dma = 0;
4269 /* Not all FDCs seem to be able to handle the version command
4270 * properly, so force a reset for the standard FDC clones,
4271 * to avoid interrupt garbage.
4273 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4276 cancel_delayed_work(&fd_timeout);
4280 DPRINT("no floppy controllers found\n");
4282 goto out_release_dma;
4285 for (drive = 0; drive < N_DRIVE; drive++) {
4286 if (!(allowed_drive_mask & (1 << drive)))
4288 if (fdc_state[FDC(drive)].version == FDC_NONE)
4291 floppy_device[drive].name = floppy_device_name;
4292 floppy_device[drive].id = drive;
4293 floppy_device[drive].dev.release = floppy_device_release;
4295 err = platform_device_register(&floppy_device[drive]);
4297 goto out_release_dma;
4299 err = device_create_file(&floppy_device[drive].dev,
4302 goto out_unreg_platform_dev;
4304 /* to be cleaned up... */
4305 disks[drive]->private_data = (void *)(long)drive;
4306 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4307 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4308 add_disk(disks[drive]);
4313 out_unreg_platform_dev:
4314 platform_device_unregister(&floppy_device[drive]);
4316 if (atomic_read(&usage_count))
4317 floppy_release_irq_and_dma();
4319 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4320 platform_driver_unregister(&floppy_driver);
4322 destroy_workqueue(floppy_wq);
4324 unregister_blkdev(FLOPPY_MAJOR, "fd");
4327 del_timer_sync(&motor_off_timer[dr]);
4328 if (disks[dr]->queue) {
4329 blk_cleanup_queue(disks[dr]->queue);
4331 * put_disk() is not paired with add_disk() and
4332 * will put queue reference one extra time. fix it.
4334 disks[dr]->queue = NULL;
4336 put_disk(disks[dr]);
4342 static __init void floppy_async_init(void *data, async_cookie_t cookie)
4348 static int __init floppy_init(void)
4351 return do_floppy_init();
4353 /* Don't hold up the bootup by the floppy initialization */
4354 async_schedule(floppy_async_init, NULL);
4359 static const struct io_region {
4364 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4366 /* address + 6 is reserved, and may be taken by IDE.
4367 * Unfortunately, Adaptec doesn't know this :-(, */
4371 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4373 while (p != io_regions) {
4375 release_region(FDCS->address + p->offset, p->size);
4379 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4381 static int floppy_request_regions(int fdc)
4383 const struct io_region *p;
4385 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4386 if (!request_region(FDCS->address + p->offset,
4387 p->size, "floppy")) {
4388 DPRINT("Floppy io-port 0x%04lx in use\n",
4389 FDCS->address + p->offset);
4390 floppy_release_allocated_regions(fdc, p);
4397 static void floppy_release_regions(int fdc)
4399 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4402 static int floppy_grab_irq_and_dma(void)
4404 if (atomic_inc_return(&usage_count) > 1)
4408 * We might have scheduled a free_irq(), wait it to
4411 flush_workqueue(floppy_wq);
4413 if (fd_request_irq()) {
4414 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4416 atomic_dec(&usage_count);
4419 if (fd_request_dma()) {
4420 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4422 if (can_use_virtual_dma & 2)
4423 use_virtual_dma = can_use_virtual_dma = 1;
4424 if (!(can_use_virtual_dma & 1)) {
4426 atomic_dec(&usage_count);
4431 for (fdc = 0; fdc < N_FDC; fdc++) {
4432 if (FDCS->address != -1) {
4433 if (floppy_request_regions(fdc))
4437 for (fdc = 0; fdc < N_FDC; fdc++) {
4438 if (FDCS->address != -1) {
4440 fd_outb(FDCS->dor, FD_DOR);
4444 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4446 for (fdc = 0; fdc < N_FDC; fdc++)
4447 if (FDCS->address != -1)
4448 fd_outb(FDCS->dor, FD_DOR);
4450 * The driver will try and free resources and relies on us
4451 * to know if they were allocated or not.
4454 irqdma_allocated = 1;
4460 floppy_release_regions(fdc);
4461 atomic_dec(&usage_count);
4465 static void floppy_release_irq_and_dma(void)
4472 unsigned long tmpaddr;
4474 if (!atomic_dec_and_test(&usage_count))
4477 if (irqdma_allocated) {
4481 irqdma_allocated = 0;
4488 if (floppy_track_buffer && max_buffer_sectors) {
4489 tmpsize = max_buffer_sectors * 1024;
4490 tmpaddr = (unsigned long)floppy_track_buffer;
4491 floppy_track_buffer = NULL;
4492 max_buffer_sectors = 0;
4493 buffer_min = buffer_max = -1;
4494 fd_dma_mem_free(tmpaddr, tmpsize);
4497 for (drive = 0; drive < N_FDC * 4; drive++)
4498 if (timer_pending(motor_off_timer + drive))
4499 pr_info("motor off timer %d still active\n", drive);
4502 if (delayed_work_pending(&fd_timeout))
4503 pr_info("floppy timer still active:%s\n", timeout_message);
4504 if (delayed_work_pending(&fd_timer))
4505 pr_info("auxiliary floppy timer still active\n");
4506 if (work_pending(&floppy_work))
4507 pr_info("work still pending\n");
4509 for (fdc = 0; fdc < N_FDC; fdc++)
4510 if (FDCS->address != -1)
4511 floppy_release_regions(fdc);
4517 static char *floppy;
4519 static void __init parse_floppy_cfg_string(char *cfg)
4525 while (*cfg && *cfg != ' ' && *cfg != '\t')
4536 static int __init floppy_module_init(void)
4539 parse_floppy_cfg_string(floppy);
4540 return floppy_init();
4542 module_init(floppy_module_init);
4544 static void __exit floppy_module_exit(void)
4548 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4549 unregister_blkdev(FLOPPY_MAJOR, "fd");
4550 platform_driver_unregister(&floppy_driver);
4552 for (drive = 0; drive < N_DRIVE; drive++) {
4553 del_timer_sync(&motor_off_timer[drive]);
4555 if ((allowed_drive_mask & (1 << drive)) &&
4556 fdc_state[FDC(drive)].version != FDC_NONE) {
4557 del_gendisk(disks[drive]);
4558 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4559 platform_device_unregister(&floppy_device[drive]);
4561 blk_cleanup_queue(disks[drive]->queue);
4564 * These disks have not called add_disk(). Don't put down
4565 * queue reference in put_disk().
4567 if (!(allowed_drive_mask & (1 << drive)) ||
4568 fdc_state[FDC(drive)].version == FDC_NONE)
4569 disks[drive]->queue = NULL;
4571 put_disk(disks[drive]);
4574 cancel_delayed_work_sync(&fd_timeout);
4575 cancel_delayed_work_sync(&fd_timer);
4576 destroy_workqueue(floppy_wq);
4578 if (atomic_read(&usage_count))
4579 floppy_release_irq_and_dma();
4581 /* eject disk, if any */
4585 module_exit(floppy_module_exit);
4587 module_param(floppy, charp, 0);
4588 module_param(FLOPPY_IRQ, int, 0);
4589 module_param(FLOPPY_DMA, int, 0);
4590 MODULE_AUTHOR("Alain L. Knaff");
4591 MODULE_SUPPORTED_DEVICE("fd");
4592 MODULE_LICENSE("GPL");
4594 /* This doesn't actually get used other than for module information */
4595 static const struct pnp_device_id floppy_pnpids[] = {
4600 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4604 __setup("floppy=", floppy_setup);
4605 module_init(floppy_init)
4608 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);