2 * linux/drivers/block/floppy.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1993, 1994 Alain Knaff
6 * Copyright (C) 1998 Alan Cox
10 * 02.12.91 - Changed to static variables to indicate need for reset
11 * and recalibrate. This makes some things easier (output_byte reset
12 * checking etc), and means less interrupt jumping in case of errors,
13 * so the code is hopefully easier to understand.
17 * This file is certainly a mess. I've tried my best to get it working,
18 * but I don't like programming floppies, and I have only one anyway.
19 * Urgel. I should check for more errors, and do more graceful error
20 * recovery. Seems there are problems with several drives. I've tried to
21 * correct them. No promises.
25 * As with hd.c, all routines within this file can (and will) be called
26 * by interrupts, so extreme caution is needed. A hardware interrupt
27 * handler may not sleep, or a kernel panic will happen. Thus I cannot
28 * call "floppy-on" directly, but have to set a special timer interrupt
33 * 28.02.92 - made track-buffering routines, based on the routines written
34 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
38 * Automatic floppy-detection and formatting written by Werner Almesberger
39 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
40 * the floppy-change signal detection.
44 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
45 * FDC data overrun bug, added some preliminary stuff for vertical
48 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
50 * TODO: Errors are still not counted properly.
54 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
55 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
56 * Christoph H. Hochst\"atter.
57 * I have fixed the shift values to the ones I always use. Maybe a new
58 * ioctl() should be created to be able to modify them.
59 * There is a bug in the driver that makes it impossible to format a
60 * floppy as the first thing after bootup.
64 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
65 * this helped the floppy driver as well. Much cleaner, and still seems to
69 /* 1994/6/24 --bbroad-- added the floppy table entries and made
70 * minor modifications to allow 2.88 floppies to be run.
73 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
78 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
79 * format bug fixes, but unfortunately some new bugs too...
82 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
83 * errors to allow safe writing by specialized programs.
86 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
87 * by defining bit 1 of the "stretch" parameter to mean put sectors on the
88 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
89 * drives are "upside-down").
93 * 1995/8/26 -- Andreas Busse -- added Mips support.
97 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
98 * features to asm/floppy.h.
102 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
106 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
107 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
108 * use of '0' for NULL.
112 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
117 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
121 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
122 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
123 * being used to store jiffies, which are unsigned longs).
127 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
128 * - get rid of check_region
133 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
134 * floppy controller (lingering task on list after module is gone... boom.)
138 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
139 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
140 * requires many non-obvious changes in arch dependent code.
143 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
144 * Better audit of register_blkdev.
147 #undef FLOPPY_SILENT_DCL_CLEAR
149 #define REALLY_SLOW_IO
153 #define DPRINT(format, args...) \
154 pr_info("floppy%d: " format, current_drive, ##args)
156 #define DCL_DEBUG /* debug disk change line */
158 #define debug_dcl(test, fmt, args...) \
159 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
161 #define debug_dcl(test, fmt, args...) \
162 do { if (0) DPRINT(fmt, ##args); } while (0)
165 /* do print messages for unexpected interrupts */
166 static int print_unex = 1;
167 #include <linux/module.h>
168 #include <linux/sched.h>
169 #include <linux/fs.h>
170 #include <linux/kernel.h>
171 #include <linux/timer.h>
172 #include <linux/workqueue.h>
174 #include <linux/fdreg.h>
175 #include <linux/fd.h>
176 #include <linux/hdreg.h>
177 #include <linux/errno.h>
178 #include <linux/slab.h>
179 #include <linux/mm.h>
180 #include <linux/bio.h>
181 #include <linux/string.h>
182 #include <linux/jiffies.h>
183 #include <linux/fcntl.h>
184 #include <linux/delay.h>
185 #include <linux/mc146818rtc.h> /* CMOS defines */
186 #include <linux/ioport.h>
187 #include <linux/interrupt.h>
188 #include <linux/init.h>
189 #include <linux/platform_device.h>
190 #include <linux/mod_devicetable.h>
191 #include <linux/mutex.h>
192 #include <linux/io.h>
193 #include <linux/uaccess.h>
194 #include <linux/async.h>
195 #include <linux/compat.h>
198 * PS/2 floppies have much slower step rates than regular floppies.
199 * It's been recommended that take about 1/4 of the default speed
200 * in some more extreme cases.
202 static DEFINE_MUTEX(floppy_mutex);
203 static int slow_floppy;
208 static int FLOPPY_IRQ = 6;
209 static int FLOPPY_DMA = 2;
210 static int can_use_virtual_dma = 2;
212 * can use virtual DMA:
213 * 0 = use of virtual DMA disallowed by config
214 * 1 = use of virtual DMA prescribed by config
215 * 2 = no virtual DMA preference configured. By default try hard DMA,
216 * but fall back on virtual DMA when not enough memory available
219 static int use_virtual_dma;
223 * 1 using virtual DMA
224 * This variable is set to virtual when a DMA mem problem arises, and
225 * reset back in floppy_grab_irq_and_dma.
226 * It is not safe to reset it in other circumstances, because the floppy
227 * driver may have several buffers in use at once, and we do currently not
228 * record each buffers capabilities
231 static DEFINE_SPINLOCK(floppy_lock);
233 static unsigned short virtual_dma_port = 0x3f0;
234 irqreturn_t floppy_interrupt(int irq, void *dev_id);
235 static int set_dor(int fdc, char mask, char data);
237 #define K_64 0x10000 /* 64KB */
239 /* the following is the mask of allowed drives. By default units 2 and
240 * 3 of both floppy controllers are disabled, because switching on the
241 * motor of these drives causes system hangs on some PCI computers. drive
242 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
243 * a drive is allowed.
245 * NOTE: This must come before we include the arch floppy header because
246 * some ports reference this variable from there. -DaveM
249 static int allowed_drive_mask = 0x33;
251 #include <asm/floppy.h>
253 static int irqdma_allocated;
255 #include <linux/blkdev.h>
256 #include <linux/blkpg.h>
257 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
258 #include <linux/completion.h>
260 static struct request *current_req;
261 static void do_fd_request(struct request_queue *q);
262 static int set_next_request(void);
264 #ifndef fd_get_dma_residue
265 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
268 /* Dma Memory related stuff */
270 #ifndef fd_dma_mem_free
271 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
274 #ifndef fd_dma_mem_alloc
275 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
278 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
280 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
282 return; /* we have the memory */
283 if (can_use_virtual_dma != 2)
284 return; /* no fallback allowed */
285 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
286 *addr = (char *)nodma_mem_alloc(l);
292 /* End dma memory related stuff */
294 static unsigned long fake_change;
295 static bool initialized;
297 #define ITYPE(x) (((x) >> 2) & 0x1f)
298 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
299 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
300 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
301 /* reverse mapping from unit and fdc to drive */
302 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
304 #define DP (&drive_params[current_drive])
305 #define DRS (&drive_state[current_drive])
306 #define DRWE (&write_errors[current_drive])
307 #define FDCS (&fdc_state[fdc])
309 #define UDP (&drive_params[drive])
310 #define UDRS (&drive_state[drive])
311 #define UDRWE (&write_errors[drive])
312 #define UFDCS (&fdc_state[FDC(drive)])
314 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
315 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
318 #define COMMAND (raw_cmd->cmd[0])
319 #define DR_SELECT (raw_cmd->cmd[1])
320 #define TRACK (raw_cmd->cmd[2])
321 #define HEAD (raw_cmd->cmd[3])
322 #define SECTOR (raw_cmd->cmd[4])
323 #define SIZECODE (raw_cmd->cmd[5])
324 #define SECT_PER_TRACK (raw_cmd->cmd[6])
325 #define GAP (raw_cmd->cmd[7])
326 #define SIZECODE2 (raw_cmd->cmd[8])
330 #define F_SIZECODE (raw_cmd->cmd[2])
331 #define F_SECT_PER_TRACK (raw_cmd->cmd[3])
332 #define F_GAP (raw_cmd->cmd[4])
333 #define F_FILL (raw_cmd->cmd[5])
337 * Maximum disk size (in kilobytes).
338 * This default is used whenever the current disk size is unknown.
339 * [Now it is rather a minimum]
341 #define MAX_DISK_SIZE 4 /* 3984 */
344 * globals used by 'result()'
346 #define MAX_REPLIES 16
347 static unsigned char reply_buffer[MAX_REPLIES];
348 static int inr; /* size of reply buffer, when called from interrupt */
349 #define ST0 (reply_buffer[0])
350 #define ST1 (reply_buffer[1])
351 #define ST2 (reply_buffer[2])
352 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
353 #define R_TRACK (reply_buffer[3])
354 #define R_HEAD (reply_buffer[4])
355 #define R_SECTOR (reply_buffer[5])
356 #define R_SIZECODE (reply_buffer[6])
358 #define SEL_DLY (2 * HZ / 100)
361 * this struct defines the different floppy drive types.
364 struct floppy_drive_params params;
365 const char *name; /* name printed while booting */
366 } default_drive_params[] = {
367 /* NOTE: the time values in jiffies should be in msec!
369 | Maximum data rate supported by drive type
370 | | Head load time, msec
371 | | | Head unload time, msec (not used)
372 | | | | Step rate interval, usec
373 | | | | | Time needed for spinup time (jiffies)
374 | | | | | | Timeout for spinning down (jiffies)
375 | | | | | | | Spindown offset (where disk stops)
376 | | | | | | | | Select delay
377 | | | | | | | | | RPS
378 | | | | | | | | | | Max number of tracks
379 | | | | | | | | | | | Interrupt timeout
380 | | | | | | | | | | | | Max nonintlv. sectors
381 | | | | | | | | | | | | | -Max Errors- flags */
382 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
383 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
385 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
386 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
388 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
389 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
391 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
392 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
394 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
395 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
397 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
398 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
400 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
401 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
402 /* | --autodetected formats--- | | |
403 * read_track | | Name printed when booting
405 * Frequency of disk change checks */
408 static struct floppy_drive_params drive_params[N_DRIVE];
409 static struct floppy_drive_struct drive_state[N_DRIVE];
410 static struct floppy_write_errors write_errors[N_DRIVE];
411 static struct timer_list motor_off_timer[N_DRIVE];
412 static struct gendisk *disks[N_DRIVE];
413 static struct block_device *opened_bdev[N_DRIVE];
414 static DEFINE_MUTEX(open_lock);
415 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
416 static int fdc_queue;
419 * This struct defines the different floppy types.
421 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
422 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
423 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
424 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
425 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
426 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
427 * side 0 is on physical side 0 (but with the misnamed sector IDs).
428 * 'stretch' should probably be renamed to something more general, like
431 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
432 * The LSB (bit 2) is flipped. For most disks, the first sector
433 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
434 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
435 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
437 * Other parameters should be self-explanatory (see also setfdprm(8)).
446 | | | | | | Data rate, | 0x40 for perp
447 | | | | | | | Spec1 (stepping rate, head unload
448 | | | | | | | | /fmt gap (gap2) */
449 static struct floppy_struct floppy_type[32] = {
450 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
451 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
452 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
453 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
454 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
455 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
456 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
457 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
458 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
459 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
461 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
462 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
463 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
464 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
465 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
466 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
467 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
468 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
469 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
470 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
472 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
473 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
474 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
475 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
476 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
477 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
478 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
479 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
480 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
481 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
483 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
484 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
487 #define SECTSIZE (_FD_SECTSIZE(*floppy))
489 /* Auto-detection: Disk type used until the next media change occurs. */
490 static struct floppy_struct *current_type[N_DRIVE];
493 * User-provided type information. current_type points to
494 * the respective entry of this array.
496 static struct floppy_struct user_params[N_DRIVE];
498 static sector_t floppy_sizes[256];
500 static char floppy_device_name[] = "floppy";
503 * The driver is trying to determine the correct media format
504 * while probing is set. rw_interrupt() clears it after a
509 /* Synchronization of FDC access. */
510 #define FD_COMMAND_NONE -1
511 #define FD_COMMAND_ERROR 2
512 #define FD_COMMAND_OKAY 3
514 static volatile int command_status = FD_COMMAND_NONE;
515 static unsigned long fdc_busy;
516 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
517 static DECLARE_WAIT_QUEUE_HEAD(command_done);
519 /* Errors during formatting are counted here. */
520 static int format_errors;
522 /* Format request descriptor. */
523 static struct format_descr format_req;
526 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
527 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
528 * H is head unload time (1=16ms, 2=32ms, etc)
533 * Because these are written to by the DMA controller, they must
534 * not contain a 64k byte boundary crossing, or data will be
537 static char *floppy_track_buffer;
538 static int max_buffer_sectors;
541 typedef void (*done_f)(int);
542 static const struct cont_t {
543 void (*interrupt)(void);
544 /* this is called after the interrupt of the
546 void (*redo)(void); /* this is called to retry the operation */
547 void (*error)(void); /* this is called to tally an error */
548 done_f done; /* this is called to say if the operation has
549 * succeeded/failed */
552 static void floppy_ready(void);
553 static void floppy_start(void);
554 static void process_fd_request(void);
555 static void recalibrate_floppy(void);
556 static void floppy_shutdown(struct work_struct *);
558 static int floppy_request_regions(int);
559 static void floppy_release_regions(int);
560 static int floppy_grab_irq_and_dma(void);
561 static void floppy_release_irq_and_dma(void);
564 * The "reset" variable should be tested whenever an interrupt is scheduled,
565 * after the commands have been sent. This is to ensure that the driver doesn't
566 * get wedged when the interrupt doesn't come because of a failed command.
567 * reset doesn't need to be tested before sending commands, because
568 * output_byte is automatically disabled when reset is set.
570 static void reset_fdc(void);
573 * These are global variables, as that's the easiest way to give
574 * information to interrupts. They are the data used for the current
578 #define NEED_1_RECAL -2
579 #define NEED_2_RECAL -3
581 static atomic_t usage_count = ATOMIC_INIT(0);
583 /* buffer related variables */
584 static int buffer_track = -1;
585 static int buffer_drive = -1;
586 static int buffer_min = -1;
587 static int buffer_max = -1;
589 /* fdc related variables, should end up in a struct */
590 static struct floppy_fdc_state fdc_state[N_FDC];
591 static int fdc; /* current fdc */
593 static struct workqueue_struct *floppy_wq;
595 static struct floppy_struct *_floppy = floppy_type;
596 static unsigned char current_drive;
597 static long current_count_sectors;
598 static unsigned char fsector_t; /* sector in track */
599 static unsigned char in_sector_offset; /* offset within physical sector,
600 * expressed in units of 512 bytes */
602 static inline bool drive_no_geom(int drive)
604 return !current_type[drive] && !ITYPE(UDRS->fd_device);
608 static inline int fd_eject(int drive)
619 static long unsigned debugtimer;
621 static inline void set_debugt(void)
623 debugtimer = jiffies;
626 static inline void debugt(const char *func, const char *msg)
628 if (DP->flags & DEBUGT)
629 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
632 static inline void set_debugt(void) { }
633 static inline void debugt(const char *func, const char *msg) { }
637 static DECLARE_DELAYED_WORK(fd_timeout, floppy_shutdown);
638 static const char *timeout_message;
640 static void is_alive(const char *func, const char *message)
642 /* this routine checks whether the floppy driver is "alive" */
643 if (test_bit(0, &fdc_busy) && command_status < 2 &&
644 !delayed_work_pending(&fd_timeout)) {
645 DPRINT("%s: timeout handler died. %s\n", func, message);
649 static void (*do_floppy)(void) = NULL;
653 static void (*lasthandler)(void);
654 static unsigned long interruptjiffies;
655 static unsigned long resultjiffies;
656 static int resultsize;
657 static unsigned long lastredo;
659 static struct output_log {
661 unsigned char status;
662 unsigned long jiffies;
663 } output_log[OLOGSIZE];
665 static int output_log_pos;
667 #define current_reqD -1
668 #define MAXTIMEOUT -2
670 static void __reschedule_timeout(int drive, const char *message)
674 if (drive == current_reqD)
675 drive = current_drive;
677 if (drive < 0 || drive >= N_DRIVE) {
681 delay = UDP->timeout;
683 mod_delayed_work(floppy_wq, &fd_timeout, delay);
684 if (UDP->flags & FD_DEBUG)
685 DPRINT("reschedule timeout %s\n", message);
686 timeout_message = message;
689 static void reschedule_timeout(int drive, const char *message)
693 spin_lock_irqsave(&floppy_lock, flags);
694 __reschedule_timeout(drive, message);
695 spin_unlock_irqrestore(&floppy_lock, flags);
698 #define INFBOUND(a, b) (a) = max_t(int, a, b)
699 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
702 * Bottom half floppy driver.
703 * ==========================
705 * This part of the file contains the code talking directly to the hardware,
706 * and also the main service loop (seek-configure-spinup-command)
711 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
712 * and the last_checked date.
714 * last_checked is the date of the last check which showed 'no disk change'
715 * FD_DISK_CHANGE is set under two conditions:
716 * 1. The floppy has been changed after some i/o to that floppy already
718 * 2. No floppy disk is in the drive. This is done in order to ensure that
719 * requests are quickly flushed in case there is no disk in the drive. It
720 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
723 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
724 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
725 * each seek. If a disk is present, the disk change line should also be
726 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
727 * change line is set, this means either that no disk is in the drive, or
728 * that it has been removed since the last seek.
730 * This means that we really have a third possibility too:
731 * The floppy has been changed after the last seek.
734 static int disk_change(int drive)
736 int fdc = FDC(drive);
738 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
739 DPRINT("WARNING disk change called early\n");
740 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
741 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
742 DPRINT("probing disk change on unselected drive\n");
743 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
744 (unsigned int)FDCS->dor);
747 debug_dcl(UDP->flags,
748 "checking disk change line for drive %d\n", drive);
749 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
750 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
751 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);
753 if (UDP->flags & FD_BROKEN_DCL)
754 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
755 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
756 set_bit(FD_VERIFY_BIT, &UDRS->flags);
757 /* verify write protection */
759 if (UDRS->maxblock) /* mark it changed */
760 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
762 /* invalidate its geometry */
763 if (UDRS->keep_data >= 0) {
764 if ((UDP->flags & FTD_MSG) &&
765 current_type[drive] != NULL)
766 DPRINT("Disk type is undefined after disk change\n");
767 current_type[drive] = NULL;
768 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
773 UDRS->last_checked = jiffies;
774 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
779 static inline int is_selected(int dor, int unit)
781 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
784 static bool is_ready_state(int status)
786 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
787 return state == STATUS_READY;
790 static int set_dor(int fdc, char mask, char data)
794 unsigned char newdor;
795 unsigned char olddor;
797 if (FDCS->address == -1)
801 newdor = (olddor & mask) | data;
802 if (newdor != olddor) {
804 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
805 drive = REVDRIVE(fdc, unit);
806 debug_dcl(UDP->flags,
807 "calling disk change from set_dor\n");
811 fd_outb(newdor, FD_DOR);
814 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
815 drive = REVDRIVE(fdc, unit);
816 UDRS->select_date = jiffies;
822 static void twaddle(void)
824 if (DP->select_delay)
826 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
827 fd_outb(FDCS->dor, FD_DOR);
828 DRS->select_date = jiffies;
832 * Reset all driver information about the current fdc.
833 * This is needed after a reset, and after a raw command.
835 static void reset_fdc_info(int mode)
839 FDCS->spec1 = FDCS->spec2 = -1;
840 FDCS->need_configure = 1;
843 for (drive = 0; drive < N_DRIVE; drive++)
844 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
845 UDRS->track = NEED_2_RECAL;
848 /* selects the fdc and drive, and enables the fdc's input/dma. */
849 static void set_fdc(int drive)
851 if (drive >= 0 && drive < N_DRIVE) {
853 current_drive = drive;
855 if (fdc != 1 && fdc != 0) {
856 pr_info("bad fdc value\n");
861 set_dor(1 - fdc, ~8, 0);
863 if (FDCS->rawcmd == 2)
865 if (fd_inb(FD_STATUS) != STATUS_READY)
869 /* locks the driver */
870 static int lock_fdc(int drive)
872 if (WARN(atomic_read(&usage_count) == 0,
873 "Trying to lock fdc while usage count=0\n"))
876 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
879 command_status = FD_COMMAND_NONE;
881 reschedule_timeout(drive, "lock fdc");
886 /* unlocks the driver */
887 static void unlock_fdc(void)
889 if (!test_bit(0, &fdc_busy))
890 DPRINT("FDC access conflict!\n");
893 command_status = FD_COMMAND_NONE;
894 cancel_delayed_work(&fd_timeout);
897 clear_bit(0, &fdc_busy);
901 /* switches the motor off after a given timeout */
902 static void motor_off_callback(unsigned long nr)
904 unsigned char mask = ~(0x10 << UNIT(nr));
906 set_dor(FDC(nr), mask, 0);
909 /* schedules motor off */
910 static void floppy_off(unsigned int drive)
912 unsigned long volatile delta;
913 int fdc = FDC(drive);
915 if (!(FDCS->dor & (0x10 << UNIT(drive))))
918 del_timer(motor_off_timer + drive);
920 /* make spindle stop in a position which minimizes spinup time
923 delta = jiffies - UDRS->first_read_date + HZ -
924 UDP->spindown_offset;
925 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
926 motor_off_timer[drive].expires =
927 jiffies + UDP->spindown - delta;
929 add_timer(motor_off_timer + drive);
933 * cycle through all N_DRIVE floppy drives, for disk change testing.
934 * stopping at current drive. This is done before any long operation, to
935 * be sure to have up to date disk change information.
937 static void scandrives(void)
943 if (DP->select_delay)
946 saved_drive = current_drive;
947 for (i = 0; i < N_DRIVE; i++) {
948 drive = (saved_drive + i + 1) % N_DRIVE;
949 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
950 continue; /* skip closed drives */
952 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
953 (0x10 << UNIT(drive))))
954 /* switch the motor off again, if it was off to
956 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
958 set_fdc(saved_drive);
961 static void empty(void)
965 static void (*floppy_work_fn)(void);
967 static void floppy_work_workfn(struct work_struct *work)
972 static DECLARE_WORK(floppy_work, floppy_work_workfn);
974 static void schedule_bh(void (*handler)(void))
976 WARN_ON(work_pending(&floppy_work));
978 floppy_work_fn = handler;
979 queue_work(floppy_wq, &floppy_work);
982 static void (*fd_timer_fn)(void) = NULL;
984 static void fd_timer_workfn(struct work_struct *work)
989 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
991 static void cancel_activity(void)
994 cancel_delayed_work_sync(&fd_timer);
995 cancel_work_sync(&floppy_work);
998 /* this function makes sure that the disk stays in the drive during the
1000 static void fd_watchdog(void)
1002 debug_dcl(DP->flags, "calling disk change from watchdog\n");
1004 if (disk_change(current_drive)) {
1005 DPRINT("disk removed during i/o\n");
1010 cancel_delayed_work(&fd_timer);
1011 fd_timer_fn = fd_watchdog;
1012 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
1016 static void main_command_interrupt(void)
1018 cancel_delayed_work(&fd_timer);
1022 /* waits for a delay (spinup or select) to pass */
1023 static int fd_wait_for_completion(unsigned long expires,
1024 void (*function)(void))
1027 reset_fdc(); /* do the reset during sleep to win time
1028 * if we don't need to sleep, it's a good
1029 * occasion anyways */
1033 if (time_before(jiffies, expires)) {
1034 cancel_delayed_work(&fd_timer);
1035 fd_timer_fn = function;
1036 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
1042 static void setup_DMA(void)
1046 if (raw_cmd->length == 0) {
1049 pr_info("zero dma transfer size:");
1050 for (i = 0; i < raw_cmd->cmd_count; i++)
1051 pr_cont("%x,", raw_cmd->cmd[i]);
1057 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1058 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1063 f = claim_dma_lock();
1066 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1067 (raw_cmd->flags & FD_RAW_READ) ?
1068 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1069 release_dma_lock(f);
1074 release_dma_lock(f);
1077 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1078 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1079 DMA_MODE_READ : DMA_MODE_WRITE);
1080 fd_set_dma_addr(raw_cmd->kernel_data);
1081 fd_set_dma_count(raw_cmd->length);
1082 virtual_dma_port = FDCS->address;
1084 release_dma_lock(f);
1088 static void show_floppy(void);
1090 /* waits until the fdc becomes ready */
1091 static int wait_til_ready(void)
1098 for (counter = 0; counter < 10000; counter++) {
1099 status = fd_inb(FD_STATUS);
1100 if (status & STATUS_READY)
1104 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1111 /* sends a command byte to the fdc */
1112 static int output_byte(char byte)
1114 int status = wait_til_ready();
1119 if (is_ready_state(status)) {
1120 fd_outb(byte, FD_DATA);
1121 output_log[output_log_pos].data = byte;
1122 output_log[output_log_pos].status = status;
1123 output_log[output_log_pos].jiffies = jiffies;
1124 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1129 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1136 /* gets the response from the fdc */
1137 static int result(void)
1142 for (i = 0; i < MAX_REPLIES; i++) {
1143 status = wait_til_ready();
1146 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1147 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1148 resultjiffies = jiffies;
1152 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1153 reply_buffer[i] = fd_inb(FD_DATA);
1158 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1166 #define MORE_OUTPUT -2
1167 /* does the fdc need more output? */
1168 static int need_more_output(void)
1170 int status = wait_til_ready();
1175 if (is_ready_state(status))
1181 /* Set perpendicular mode as required, based on data rate, if supported.
1182 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1184 static void perpendicular_mode(void)
1186 unsigned char perp_mode;
1188 if (raw_cmd->rate & 0x40) {
1189 switch (raw_cmd->rate & 3) {
1197 DPRINT("Invalid data rate for perpendicular mode!\n");
1201 * convenient way to return to
1202 * redo without too much hassle
1203 * (deep stack et al.)
1210 if (FDCS->perp_mode == perp_mode)
1212 if (FDCS->version >= FDC_82077_ORIG) {
1213 output_byte(FD_PERPENDICULAR);
1214 output_byte(perp_mode);
1215 FDCS->perp_mode = perp_mode;
1216 } else if (perp_mode) {
1217 DPRINT("perpendicular mode not supported by this FDC.\n");
1219 } /* perpendicular_mode */
1221 static int fifo_depth = 0xa;
1224 static int fdc_configure(void)
1227 output_byte(FD_CONFIGURE);
1228 if (need_more_output() != MORE_OUTPUT)
1231 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1232 output_byte(0); /* pre-compensation from track
1237 #define NOMINAL_DTR 500
1239 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1240 * head load time, and DMA disable flag to values needed by floppy.
1242 * The value "dtr" is the data transfer rate in Kbps. It is needed
1243 * to account for the data rate-based scaling done by the 82072 and 82077
1244 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1247 * Note that changing the data transfer rate has a (probably deleterious)
1248 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1249 * fdc_specify is called again after each data transfer rate
1252 * srt: 1000 to 16000 in microseconds
1253 * hut: 16 to 240 milliseconds
1254 * hlt: 2 to 254 milliseconds
1256 * These values are rounded up to the next highest available delay time.
1258 static void fdc_specify(void)
1260 unsigned char spec1;
1261 unsigned char spec2;
1265 unsigned long dtr = NOMINAL_DTR;
1266 unsigned long scale_dtr = NOMINAL_DTR;
1267 int hlt_max_code = 0x7f;
1268 int hut_max_code = 0xf;
1270 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1272 FDCS->need_configure = 0;
1275 switch (raw_cmd->rate & 0x03) {
1281 if (FDCS->version >= FDC_82078) {
1282 /* chose the default rate table, not the one
1283 * where 1 = 2 Mbps */
1284 output_byte(FD_DRIVESPEC);
1285 if (need_more_output() == MORE_OUTPUT) {
1286 output_byte(UNIT(current_drive));
1296 if (FDCS->version >= FDC_82072) {
1298 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1299 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1302 /* Convert step rate from microseconds to milliseconds and 4 bits */
1303 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1310 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1313 else if (hlt > 0x7f)
1316 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1322 spec1 = (srt << 4) | hut;
1323 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1325 /* If these parameters did not change, just return with success */
1326 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1327 /* Go ahead and set spec1 and spec2 */
1328 output_byte(FD_SPECIFY);
1329 output_byte(FDCS->spec1 = spec1);
1330 output_byte(FDCS->spec2 = spec2);
1334 /* Set the FDC's data transfer rate on behalf of the specified drive.
1335 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1336 * of the specify command (i.e. using the fdc_specify function).
1338 static int fdc_dtr(void)
1340 /* If data rate not already set to desired value, set it. */
1341 if ((raw_cmd->rate & 3) == FDCS->dtr)
1345 fd_outb(raw_cmd->rate & 3, FD_DCR);
1347 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1348 * need a stabilization period of several milliseconds to be
1349 * enforced after data rate changes before R/W operations.
1350 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1352 FDCS->dtr = raw_cmd->rate & 3;
1353 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready);
1356 static void tell_sector(void)
1358 pr_cont(": track %d, head %d, sector %d, size %d",
1359 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1362 static void print_errors(void)
1365 if (ST0 & ST0_ECE) {
1366 pr_cont("Recalibrate failed!");
1367 } else if (ST2 & ST2_CRC) {
1368 pr_cont("data CRC error");
1370 } else if (ST1 & ST1_CRC) {
1371 pr_cont("CRC error");
1373 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1376 pr_cont("sector not found");
1379 pr_cont("probe failed...");
1380 } else if (ST2 & ST2_WC) { /* seek error */
1381 pr_cont("wrong cylinder");
1382 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1383 pr_cont("bad cylinder");
1385 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1393 * OK, this error interpreting routine is called after a
1394 * DMA read/write has succeeded
1395 * or failed, so we check the results, and copy any buffers.
1396 * hhb: Added better error reporting.
1397 * ak: Made this into a separate routine.
1399 static int interpret_errors(void)
1404 DPRINT("-- FDC reply error\n");
1409 /* check IC to find cause of interrupt */
1410 switch (ST0 & ST0_INTR) {
1411 case 0x40: /* error occurred during command execution */
1413 return 0; /* occurs with pseudo-DMA */
1416 DPRINT("Drive is write protected\n");
1417 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1420 } else if (ST1 & ST1_ND) {
1421 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1422 } else if (ST1 & ST1_OR) {
1423 if (DP->flags & FTD_MSG)
1424 DPRINT("Over/Underrun - retrying\n");
1426 } else if (*errors >= DP->max_errors.reporting) {
1429 if (ST2 & ST2_WC || ST2 & ST2_BC)
1430 /* wrong cylinder => recal */
1431 DRS->track = NEED_2_RECAL;
1433 case 0x80: /* invalid command given */
1434 DPRINT("Invalid FDC command given!\n");
1438 DPRINT("Abnormal termination caused by polling\n");
1441 default: /* (0) Normal command termination */
1447 * This routine is called when everything should be correctly set up
1448 * for the transfer (i.e. floppy motor is on, the correct floppy is
1449 * selected, and the head is sitting on the right track).
1451 static void setup_rw_floppy(void)
1457 unsigned long ready_date;
1458 void (*function)(void);
1460 flags = raw_cmd->flags;
1461 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1462 flags |= FD_RAW_INTR;
1464 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1465 ready_date = DRS->spinup_date + DP->spinup;
1466 /* If spinup will take a long time, rerun scandrives
1467 * again just before spinup completion. Beware that
1468 * after scandrives, we must again wait for selection.
1470 if (time_after(ready_date, jiffies + DP->select_delay)) {
1471 ready_date -= DP->select_delay;
1472 function = floppy_start;
1474 function = setup_rw_floppy;
1476 /* wait until the floppy is spinning fast enough */
1477 if (fd_wait_for_completion(ready_date, function))
1480 dflags = DRS->flags;
1482 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1485 if (flags & FD_RAW_INTR)
1486 do_floppy = main_command_interrupt;
1489 for (i = 0; i < raw_cmd->cmd_count; i++)
1490 r |= output_byte(raw_cmd->cmd[i]);
1492 debugt(__func__, "rw_command");
1500 if (!(flags & FD_RAW_INTR)) {
1503 } else if (flags & FD_RAW_NEED_DISK)
1507 static int blind_seek;
1510 * This is the routine called after every seek (or recalibrate) interrupt
1511 * from the floppy controller.
1513 static void seek_interrupt(void)
1515 debugt(__func__, "");
1516 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1517 DPRINT("seek failed\n");
1518 DRS->track = NEED_2_RECAL;
1523 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1524 debug_dcl(DP->flags,
1525 "clearing NEWCHANGE flag because of effective seek\n");
1526 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1527 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1528 /* effective seek */
1529 DRS->select_date = jiffies;
1535 static void check_wp(void)
1537 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1538 /* check write protection */
1539 output_byte(FD_GETSTATUS);
1540 output_byte(UNIT(current_drive));
1541 if (result() != 1) {
1545 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1546 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1547 debug_dcl(DP->flags,
1548 "checking whether disk is write protected\n");
1549 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1551 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1553 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1557 static void seek_floppy(void)
1563 debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
1565 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1566 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1567 /* the media changed flag should be cleared after the seek.
1568 * If it isn't, this means that there is really no disk in
1571 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1576 if (DRS->track <= NEED_1_RECAL) {
1577 recalibrate_floppy();
1579 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1580 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1581 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1582 /* we seek to clear the media-changed condition. Does anybody
1583 * know a more elegant way, which works on all drives? */
1585 track = raw_cmd->track - 1;
1587 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1588 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1590 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1596 if (raw_cmd->track != DRS->track &&
1597 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1598 track = raw_cmd->track;
1605 do_floppy = seek_interrupt;
1606 output_byte(FD_SEEK);
1607 output_byte(UNIT(current_drive));
1608 if (output_byte(track) < 0) {
1612 debugt(__func__, "");
1615 static void recal_interrupt(void)
1617 debugt(__func__, "");
1620 else if (ST0 & ST0_ECE) {
1621 switch (DRS->track) {
1623 debugt(__func__, "need 1 recal");
1624 /* after a second recalibrate, we still haven't
1625 * reached track 0. Probably no drive. Raise an
1626 * error, as failing immediately might upset
1627 * computers possessed by the Devil :-) */
1632 debugt(__func__, "need 2 recal");
1633 /* If we already did a recalibrate,
1634 * and we are not at track 0, this
1635 * means we have moved. (The only way
1636 * not to move at recalibration is to
1637 * be already at track 0.) Clear the
1638 * new change flag */
1639 debug_dcl(DP->flags,
1640 "clearing NEWCHANGE flag because of second recalibrate\n");
1642 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1643 DRS->select_date = jiffies;
1646 debugt(__func__, "default");
1647 /* Recalibrate moves the head by at
1648 * most 80 steps. If after one
1649 * recalibrate we don't have reached
1650 * track 0, this might mean that we
1651 * started beyond track 80. Try
1653 DRS->track = NEED_1_RECAL;
1661 static void print_result(char *message, int inr)
1665 DPRINT("%s ", message);
1667 for (i = 0; i < inr; i++)
1668 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1672 /* interrupt handler. Note that this can be called externally on the Sparc */
1673 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1677 void (*handler)(void) = do_floppy;
1679 lasthandler = handler;
1680 interruptjiffies = jiffies;
1682 f = claim_dma_lock();
1684 release_dma_lock(f);
1687 if (fdc >= N_FDC || FDCS->address == -1) {
1688 /* we don't even know which FDC is the culprit */
1689 pr_info("DOR0=%x\n", fdc_state[0].dor);
1690 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1691 pr_info("handler=%pf\n", handler);
1692 is_alive(__func__, "bizarre fdc");
1697 /* We have to clear the reset flag here, because apparently on boxes
1698 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1699 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1700 * emission of the SENSEI's.
1701 * It is OK to emit floppy commands because we are in an interrupt
1702 * handler here, and thus we have to fear no interference of other
1706 do_print = !handler && print_unex && initialized;
1710 print_result("unexpected interrupt", inr);
1714 output_byte(FD_SENSEI);
1717 print_result("sensei", inr);
1719 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1720 inr == 2 && max_sensei);
1726 schedule_bh(handler);
1727 is_alive(__func__, "normal interrupt end");
1729 /* FIXME! Was it really for us? */
1733 static void recalibrate_floppy(void)
1735 debugt(__func__, "");
1736 do_floppy = recal_interrupt;
1737 output_byte(FD_RECALIBRATE);
1738 if (output_byte(UNIT(current_drive)) < 0)
1743 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1745 static void reset_interrupt(void)
1747 debugt(__func__, "");
1748 result(); /* get the status ready for set_fdc */
1750 pr_info("reset set in interrupt, calling %pf\n", cont->error);
1751 cont->error(); /* a reset just after a reset. BAD! */
1757 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1758 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1760 static void reset_fdc(void)
1762 unsigned long flags;
1764 do_floppy = reset_interrupt;
1768 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1769 /* Irrelevant for systems with true DMA (i386). */
1771 flags = claim_dma_lock();
1773 release_dma_lock(flags);
1775 if (FDCS->version >= FDC_82072A)
1776 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1778 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1779 udelay(FD_RESET_DELAY);
1780 fd_outb(FDCS->dor, FD_DOR);
1784 static void show_floppy(void)
1789 pr_info("floppy driver state\n");
1790 pr_info("-------------------\n");
1791 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1792 jiffies, interruptjiffies, jiffies - interruptjiffies,
1795 pr_info("timeout_message=%s\n", timeout_message);
1796 pr_info("last output bytes:\n");
1797 for (i = 0; i < OLOGSIZE; i++)
1798 pr_info("%2x %2x %lu\n",
1799 output_log[(i + output_log_pos) % OLOGSIZE].data,
1800 output_log[(i + output_log_pos) % OLOGSIZE].status,
1801 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1802 pr_info("last result at %lu\n", resultjiffies);
1803 pr_info("last redo_fd_request at %lu\n", lastredo);
1804 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1805 reply_buffer, resultsize, true);
1807 pr_info("status=%x\n", fd_inb(FD_STATUS));
1808 pr_info("fdc_busy=%lu\n", fdc_busy);
1810 pr_info("do_floppy=%pf\n", do_floppy);
1811 if (work_pending(&floppy_work))
1812 pr_info("floppy_work.func=%pf\n", floppy_work.func);
1813 if (delayed_work_pending(&fd_timer))
1814 pr_info("delayed work.function=%p expires=%ld\n",
1816 fd_timer.timer.expires - jiffies);
1817 if (delayed_work_pending(&fd_timeout))
1818 pr_info("timer_function=%p expires=%ld\n",
1819 fd_timeout.work.func,
1820 fd_timeout.timer.expires - jiffies);
1822 pr_info("cont=%p\n", cont);
1823 pr_info("current_req=%p\n", current_req);
1824 pr_info("command_status=%d\n", command_status);
1828 static void floppy_shutdown(struct work_struct *arg)
1830 unsigned long flags;
1836 flags = claim_dma_lock();
1838 release_dma_lock(flags);
1840 /* avoid dma going to a random drive after shutdown */
1843 DPRINT("floppy timeout called\n");
1847 cont->redo(); /* this will recall reset when needed */
1849 pr_info("no cont in shutdown!\n");
1850 process_fd_request();
1852 is_alive(__func__, "");
1855 /* start motor, check media-changed condition and write protection */
1856 static int start_motor(void (*function)(void))
1862 data = UNIT(current_drive);
1863 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1864 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1866 /* no read since this drive is running */
1867 DRS->first_read_date = 0;
1868 /* note motor start time if motor is not yet running */
1869 DRS->spinup_date = jiffies;
1870 data |= (0x10 << UNIT(current_drive));
1872 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1873 mask &= ~(0x10 << UNIT(current_drive));
1875 /* starts motor and selects floppy */
1876 del_timer(motor_off_timer + current_drive);
1877 set_dor(fdc, mask, data);
1879 /* wait_for_completion also schedules reset if needed. */
1880 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1884 static void floppy_ready(void)
1890 if (start_motor(floppy_ready))
1895 debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1896 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1897 disk_change(current_drive) && !DP->select_delay)
1898 twaddle(); /* this clears the dcl on certain
1899 * drive/controller combinations */
1901 #ifdef fd_chose_dma_mode
1902 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1903 unsigned long flags = claim_dma_lock();
1904 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1905 release_dma_lock(flags);
1909 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1910 perpendicular_mode();
1911 fdc_specify(); /* must be done here because of hut, hlt ... */
1914 if ((raw_cmd->flags & FD_RAW_READ) ||
1915 (raw_cmd->flags & FD_RAW_WRITE))
1921 static void floppy_start(void)
1923 reschedule_timeout(current_reqD, "floppy start");
1926 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1927 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1932 * ========================================================================
1933 * here ends the bottom half. Exported routines are:
1934 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1935 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1936 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1938 * ========================================================================
1941 * General purpose continuations.
1942 * ==============================
1945 static void do_wakeup(void)
1947 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1949 command_status += 2;
1950 wake_up(&command_done);
1953 static const struct cont_t wakeup_cont = {
1957 .done = (done_f)empty
1960 static const struct cont_t intr_cont = {
1962 .redo = process_fd_request,
1964 .done = (done_f)empty
1967 static int wait_til_done(void (*handler)(void), bool interruptible)
1971 schedule_bh(handler);
1974 wait_event_interruptible(command_done, command_status >= 2);
1976 wait_event(command_done, command_status >= 2);
1978 if (command_status < 2) {
1986 command_status = FD_COMMAND_ERROR;
1987 if (command_status == FD_COMMAND_OKAY)
1991 command_status = FD_COMMAND_NONE;
1995 static void generic_done(int result)
1997 command_status = result;
1998 cont = &wakeup_cont;
2001 static void generic_success(void)
2006 static void generic_failure(void)
2011 static void success_and_wakeup(void)
2018 * formatting and rw support.
2019 * ==========================
2022 static int next_valid_format(void)
2026 probed_format = DRS->probed_format;
2028 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2029 DRS->probed_format = 0;
2032 if (floppy_type[DP->autodetect[probed_format]].sect) {
2033 DRS->probed_format = probed_format;
2040 static void bad_flp_intr(void)
2045 DRS->probed_format++;
2046 if (!next_valid_format())
2049 err_count = ++(*errors);
2050 INFBOUND(DRWE->badness, err_count);
2051 if (err_count > DP->max_errors.abort)
2053 if (err_count > DP->max_errors.reset)
2055 else if (err_count > DP->max_errors.recal)
2056 DRS->track = NEED_2_RECAL;
2059 static void set_floppy(int drive)
2061 int type = ITYPE(UDRS->fd_device);
2064 _floppy = floppy_type + type;
2066 _floppy = current_type[drive];
2070 * formatting support.
2071 * ===================
2073 static void format_interrupt(void)
2075 switch (interpret_errors()) {
2086 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2087 #define CT(x) ((x) | 0xc0)
2089 static void setup_format_params(int track)
2097 unsigned char track, head, sect, size;
2098 } *here = (struct fparm *)floppy_track_buffer;
2100 raw_cmd = &default_raw_cmd;
2101 raw_cmd->track = track;
2103 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2104 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2105 raw_cmd->rate = _floppy->rate & 0x43;
2106 raw_cmd->cmd_count = NR_F;
2107 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2108 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2109 F_SIZECODE = FD_SIZECODE(_floppy);
2110 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2111 F_GAP = _floppy->fmt_gap;
2112 F_FILL = FD_FILL_BYTE;
2114 raw_cmd->kernel_data = floppy_track_buffer;
2115 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2117 /* allow for about 30ms for data transport per track */
2118 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2120 /* a ``cylinder'' is two tracks plus a little stepping time */
2121 track_shift = 2 * head_shift + 3;
2123 /* position of logical sector 1 on this track */
2124 n = (track_shift * format_req.track + head_shift * format_req.head)
2127 /* determine interleave */
2129 if (_floppy->fmt_gap < 0x22)
2132 /* initialize field */
2133 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2134 here[count].track = format_req.track;
2135 here[count].head = format_req.head;
2136 here[count].sect = 0;
2137 here[count].size = F_SIZECODE;
2139 /* place logical sectors */
2140 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2141 here[n].sect = count;
2142 n = (n + il) % F_SECT_PER_TRACK;
2143 if (here[n].sect) { /* sector busy, find next free sector */
2145 if (n >= F_SECT_PER_TRACK) {
2146 n -= F_SECT_PER_TRACK;
2147 while (here[n].sect)
2152 if (_floppy->stretch & FD_SECTBASEMASK) {
2153 for (count = 0; count < F_SECT_PER_TRACK; count++)
2154 here[count].sect += FD_SECTBASE(_floppy) - 1;
2158 static void redo_format(void)
2161 setup_format_params(format_req.track << STRETCH(_floppy));
2163 debugt(__func__, "queue format request");
2166 static const struct cont_t format_cont = {
2167 .interrupt = format_interrupt,
2168 .redo = redo_format,
2169 .error = bad_flp_intr,
2170 .done = generic_done
2173 static int do_format(int drive, struct format_descr *tmp_format_req)
2177 if (lock_fdc(drive))
2182 _floppy->track > DP->tracks ||
2183 tmp_format_req->track >= _floppy->track ||
2184 tmp_format_req->head >= _floppy->head ||
2185 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2186 !_floppy->fmt_gap) {
2187 process_fd_request();
2190 format_req = *tmp_format_req;
2192 cont = &format_cont;
2193 errors = &format_errors;
2194 ret = wait_til_done(redo_format, true);
2197 process_fd_request();
2202 * Buffer read/write and support
2203 * =============================
2206 static void floppy_end_request(struct request *req, blk_status_t error)
2208 unsigned int nr_sectors = current_count_sectors;
2209 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2211 /* current_count_sectors can be zero if transfer failed */
2213 nr_sectors = blk_rq_cur_sectors(req);
2214 if (__blk_end_request(req, error, nr_sectors << 9))
2217 /* We're done with the request */
2222 /* new request_done. Can handle physical sectors which are smaller than a
2224 static void request_done(int uptodate)
2226 struct request *req = current_req;
2227 struct request_queue *q;
2228 unsigned long flags;
2230 char msg[sizeof("request done ") + sizeof(int) * 3];
2233 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2234 reschedule_timeout(MAXTIMEOUT, msg);
2237 pr_info("floppy.c: no request in request_done\n");
2244 /* maintain values for invalidation on geometry
2246 block = current_count_sectors + blk_rq_pos(req);
2247 INFBOUND(DRS->maxblock, block);
2248 if (block > _floppy->sect)
2251 /* unlock chained buffers */
2252 spin_lock_irqsave(q->queue_lock, flags);
2253 floppy_end_request(req, 0);
2254 spin_unlock_irqrestore(q->queue_lock, flags);
2256 if (rq_data_dir(req) == WRITE) {
2257 /* record write error information */
2258 DRWE->write_errors++;
2259 if (DRWE->write_errors == 1) {
2260 DRWE->first_error_sector = blk_rq_pos(req);
2261 DRWE->first_error_generation = DRS->generation;
2263 DRWE->last_error_sector = blk_rq_pos(req);
2264 DRWE->last_error_generation = DRS->generation;
2266 spin_lock_irqsave(q->queue_lock, flags);
2267 floppy_end_request(req, BLK_STS_IOERR);
2268 spin_unlock_irqrestore(q->queue_lock, flags);
2272 /* Interrupt handler evaluating the result of the r/w operation */
2273 static void rw_interrupt(void)
2281 /* some Toshiba floppy controllers occasionnally seem to
2282 * return bogus interrupts after read/write operations, which
2283 * can be recognized by a bad head number (>= 2) */
2287 if (!DRS->first_read_date)
2288 DRS->first_read_date = jiffies;
2291 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2303 nr_sectors = (((R_TRACK - TRACK) * heads +
2304 R_HEAD - HEAD) * SECT_PER_TRACK +
2305 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2307 if (nr_sectors / ssize >
2308 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2309 DPRINT("long rw: %x instead of %lx\n",
2310 nr_sectors, current_count_sectors);
2311 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2312 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2313 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2314 pr_info("heads=%d eoc=%d\n", heads, eoc);
2315 pr_info("spt=%d st=%d ss=%d\n",
2316 SECT_PER_TRACK, fsector_t, ssize);
2317 pr_info("in_sector_offset=%d\n", in_sector_offset);
2320 nr_sectors -= in_sector_offset;
2321 INFBOUND(nr_sectors, 0);
2322 SUPBOUND(current_count_sectors, nr_sectors);
2324 switch (interpret_errors()) {
2329 if (!current_count_sectors) {
2336 if (!current_count_sectors) {
2340 current_type[current_drive] = _floppy;
2341 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2346 if (DP->flags & FTD_MSG)
2347 DPRINT("Auto-detected floppy type %s in fd%d\n",
2348 _floppy->name, current_drive);
2349 current_type[current_drive] = _floppy;
2350 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2354 if (CT(COMMAND) != FD_READ ||
2355 raw_cmd->kernel_data == bio_data(current_req->bio)) {
2356 /* transfer directly from buffer */
2358 } else if (CT(COMMAND) == FD_READ) {
2359 buffer_track = raw_cmd->track;
2360 buffer_drive = current_drive;
2361 INFBOUND(buffer_max, nr_sectors + fsector_t);
2366 /* Compute maximal contiguous buffer size. */
2367 static int buffer_chain_size(void)
2371 struct req_iterator iter;
2374 base = bio_data(current_req->bio);
2377 rq_for_each_segment(bv, current_req, iter) {
2378 if (page_address(bv.bv_page) + bv.bv_offset != base + size)
2387 /* Compute the maximal transfer size */
2388 static int transfer_size(int ssize, int max_sector, int max_size)
2390 SUPBOUND(max_sector, fsector_t + max_size);
2393 max_sector -= (max_sector % _floppy->sect) % ssize;
2395 /* transfer size, beginning not aligned */
2396 current_count_sectors = max_sector - fsector_t;
2402 * Move data from/to the track buffer to/from the buffer cache.
2404 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2406 int remaining; /* number of transferred 512-byte sectors */
2411 struct req_iterator iter;
2413 max_sector = transfer_size(ssize,
2414 min(max_sector, max_sector_2),
2415 blk_rq_sectors(current_req));
2417 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2418 buffer_max > fsector_t + blk_rq_sectors(current_req))
2419 current_count_sectors = min_t(int, buffer_max - fsector_t,
2420 blk_rq_sectors(current_req));
2422 remaining = current_count_sectors << 9;
2423 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2424 DPRINT("in copy buffer\n");
2425 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2426 pr_info("remaining=%d\n", remaining >> 9);
2427 pr_info("current_req->nr_sectors=%u\n",
2428 blk_rq_sectors(current_req));
2429 pr_info("current_req->current_nr_sectors=%u\n",
2430 blk_rq_cur_sectors(current_req));
2431 pr_info("max_sector=%d\n", max_sector);
2432 pr_info("ssize=%d\n", ssize);
2435 buffer_max = max(max_sector, buffer_max);
2437 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2439 size = blk_rq_cur_bytes(current_req);
2441 rq_for_each_segment(bv, current_req, iter) {
2446 SUPBOUND(size, remaining);
2448 buffer = page_address(bv.bv_page) + bv.bv_offset;
2449 if (dma_buffer + size >
2450 floppy_track_buffer + (max_buffer_sectors << 10) ||
2451 dma_buffer < floppy_track_buffer) {
2452 DPRINT("buffer overrun in copy buffer %d\n",
2453 (int)((floppy_track_buffer - dma_buffer) >> 9));
2454 pr_info("fsector_t=%d buffer_min=%d\n",
2455 fsector_t, buffer_min);
2456 pr_info("current_count_sectors=%ld\n",
2457 current_count_sectors);
2458 if (CT(COMMAND) == FD_READ)
2460 if (CT(COMMAND) == FD_WRITE)
2464 if (((unsigned long)buffer) % 512)
2465 DPRINT("%p buffer not aligned\n", buffer);
2467 if (CT(COMMAND) == FD_READ)
2468 memcpy(buffer, dma_buffer, size);
2470 memcpy(dma_buffer, buffer, size);
2477 max_sector -= remaining >> 9;
2478 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2482 /* work around a bug in pseudo DMA
2483 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2484 * sending data. Hence we need a different way to signal the
2485 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2486 * does not work with MT, hence we can only transfer one head at
2489 static void virtualdmabug_workaround(void)
2494 if (CT(COMMAND) == FD_WRITE) {
2495 COMMAND &= ~0x80; /* switch off multiple track mode */
2497 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2498 end_sector = SECTOR + hard_sectors - 1;
2499 if (end_sector > SECT_PER_TRACK) {
2500 pr_info("too many sectors %d > %d\n",
2501 end_sector, SECT_PER_TRACK);
2504 SECT_PER_TRACK = end_sector;
2505 /* make sure SECT_PER_TRACK
2506 * points to end of transfer */
2511 * Formulate a read/write request.
2512 * this routine decides where to load the data (directly to buffer, or to
2513 * tmp floppy area), how much data to load (the size of the buffer, the whole
2514 * track, or a single sector)
2515 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2516 * allocation on the fly, it should be done here. No other part should need
2520 static int make_raw_rw_request(void)
2522 int aligned_sector_t;
2528 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2531 set_fdc((long)current_req->rq_disk->private_data);
2533 raw_cmd = &default_raw_cmd;
2534 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2535 raw_cmd->cmd_count = NR_RW;
2536 if (rq_data_dir(current_req) == READ) {
2537 raw_cmd->flags |= FD_RAW_READ;
2538 COMMAND = FM_MODE(_floppy, FD_READ);
2539 } else if (rq_data_dir(current_req) == WRITE) {
2540 raw_cmd->flags |= FD_RAW_WRITE;
2541 COMMAND = FM_MODE(_floppy, FD_WRITE);
2543 DPRINT("%s: unknown command\n", __func__);
2547 max_sector = _floppy->sect * _floppy->head;
2549 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2550 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2551 if (_floppy->track && TRACK >= _floppy->track) {
2552 if (blk_rq_cur_sectors(current_req) & 1) {
2553 current_count_sectors = 1;
2558 HEAD = fsector_t / _floppy->sect;
2560 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2561 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2562 fsector_t < _floppy->sect)
2563 max_sector = _floppy->sect;
2565 /* 2M disks have phantom sectors on the first track */
2566 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2567 max_sector = 2 * _floppy->sect / 3;
2568 if (fsector_t >= max_sector) {
2569 current_count_sectors =
2570 min_t(int, _floppy->sect - fsector_t,
2571 blk_rq_sectors(current_req));
2576 SIZECODE = FD_SIZECODE(_floppy);
2577 raw_cmd->rate = _floppy->rate & 0x43;
2578 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2585 raw_cmd->track = TRACK << STRETCH(_floppy);
2586 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2588 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2589 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2590 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2591 FD_SECTBASE(_floppy);
2593 /* tracksize describes the size which can be filled up with sectors
2596 tracksize = _floppy->sect - _floppy->sect % ssize;
2597 if (tracksize < _floppy->sect) {
2599 if (tracksize <= fsector_t % _floppy->sect)
2602 /* if we are beyond tracksize, fill up using smaller sectors */
2603 while (tracksize <= fsector_t % _floppy->sect) {
2604 while (tracksize + ssize > _floppy->sect) {
2612 max_sector = HEAD * _floppy->sect + tracksize;
2613 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2614 max_sector = _floppy->sect;
2615 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2616 /* for virtual DMA bug workaround */
2617 max_sector = _floppy->sect;
2620 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2621 aligned_sector_t = fsector_t - in_sector_offset;
2622 max_size = blk_rq_sectors(current_req);
2623 if ((raw_cmd->track == buffer_track) &&
2624 (current_drive == buffer_drive) &&
2625 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2626 /* data already in track buffer */
2627 if (CT(COMMAND) == FD_READ) {
2628 copy_buffer(1, max_sector, buffer_max);
2631 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2632 if (CT(COMMAND) == FD_WRITE) {
2633 unsigned int sectors;
2635 sectors = fsector_t + blk_rq_sectors(current_req);
2636 if (sectors > ssize && sectors < ssize + ssize)
2637 max_size = ssize + ssize;
2641 raw_cmd->flags &= ~FD_RAW_WRITE;
2642 raw_cmd->flags |= FD_RAW_READ;
2643 COMMAND = FM_MODE(_floppy, FD_READ);
2644 } else if ((unsigned long)bio_data(current_req->bio) < MAX_DMA_ADDRESS) {
2645 unsigned long dma_limit;
2646 int direct, indirect;
2649 transfer_size(ssize, max_sector,
2650 max_buffer_sectors * 2) - fsector_t;
2653 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2654 * on a 64 bit machine!
2656 max_size = buffer_chain_size();
2657 dma_limit = (MAX_DMA_ADDRESS -
2658 ((unsigned long)bio_data(current_req->bio))) >> 9;
2659 if ((unsigned long)max_size > dma_limit)
2660 max_size = dma_limit;
2661 /* 64 kb boundaries */
2662 if (CROSS_64KB(bio_data(current_req->bio), max_size << 9))
2664 ((unsigned long)bio_data(current_req->bio)) %
2666 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2668 * We try to read tracks, but if we get too many errors, we
2669 * go back to reading just one sector at a time.
2671 * This means we should be able to read a sector even if there
2672 * are other bad sectors on this track.
2675 (indirect * 2 > direct * 3 &&
2676 *errors < DP->max_errors.read_track &&
2678 (DP->read_track & (1 << DRS->probed_format)))))) {
2679 max_size = blk_rq_sectors(current_req);
2681 raw_cmd->kernel_data = bio_data(current_req->bio);
2682 raw_cmd->length = current_count_sectors << 9;
2683 if (raw_cmd->length == 0) {
2684 DPRINT("%s: zero dma transfer attempted\n", __func__);
2685 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2686 indirect, direct, fsector_t);
2689 virtualdmabug_workaround();
2694 if (CT(COMMAND) == FD_READ)
2695 max_size = max_sector; /* unbounded */
2697 /* claim buffer track if needed */
2698 if (buffer_track != raw_cmd->track || /* bad track */
2699 buffer_drive != current_drive || /* bad drive */
2700 fsector_t > buffer_max ||
2701 fsector_t < buffer_min ||
2702 ((CT(COMMAND) == FD_READ ||
2703 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2704 max_sector > 2 * max_buffer_sectors + buffer_min &&
2705 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2706 /* not enough space */
2708 buffer_drive = current_drive;
2709 buffer_max = buffer_min = aligned_sector_t;
2711 raw_cmd->kernel_data = floppy_track_buffer +
2712 ((aligned_sector_t - buffer_min) << 9);
2714 if (CT(COMMAND) == FD_WRITE) {
2715 /* copy write buffer to track buffer.
2716 * if we get here, we know that the write
2717 * is either aligned or the data already in the buffer
2718 * (buffer will be overwritten) */
2719 if (in_sector_offset && buffer_track == -1)
2720 DPRINT("internal error offset !=0 on write\n");
2721 buffer_track = raw_cmd->track;
2722 buffer_drive = current_drive;
2723 copy_buffer(ssize, max_sector,
2724 2 * max_buffer_sectors + buffer_min);
2726 transfer_size(ssize, max_sector,
2727 2 * max_buffer_sectors + buffer_min -
2730 /* round up current_count_sectors to get dma xfer size */
2731 raw_cmd->length = in_sector_offset + current_count_sectors;
2732 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2733 raw_cmd->length <<= 9;
2734 if ((raw_cmd->length < current_count_sectors << 9) ||
2735 (raw_cmd->kernel_data != bio_data(current_req->bio) &&
2736 CT(COMMAND) == FD_WRITE &&
2737 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2738 aligned_sector_t < buffer_min)) ||
2739 raw_cmd->length % (128 << SIZECODE) ||
2740 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2741 DPRINT("fractionary current count b=%lx s=%lx\n",
2742 raw_cmd->length, current_count_sectors);
2743 if (raw_cmd->kernel_data != bio_data(current_req->bio))
2744 pr_info("addr=%d, length=%ld\n",
2745 (int)((raw_cmd->kernel_data -
2746 floppy_track_buffer) >> 9),
2747 current_count_sectors);
2748 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2749 fsector_t, aligned_sector_t, max_sector, max_size);
2750 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2751 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2752 COMMAND, SECTOR, HEAD, TRACK);
2753 pr_info("buffer drive=%d\n", buffer_drive);
2754 pr_info("buffer track=%d\n", buffer_track);
2755 pr_info("buffer_min=%d\n", buffer_min);
2756 pr_info("buffer_max=%d\n", buffer_max);
2760 if (raw_cmd->kernel_data != bio_data(current_req->bio)) {
2761 if (raw_cmd->kernel_data < floppy_track_buffer ||
2762 current_count_sectors < 0 ||
2763 raw_cmd->length < 0 ||
2764 raw_cmd->kernel_data + raw_cmd->length >
2765 floppy_track_buffer + (max_buffer_sectors << 10)) {
2766 DPRINT("buffer overrun in schedule dma\n");
2767 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2768 fsector_t, buffer_min, raw_cmd->length >> 9);
2769 pr_info("current_count_sectors=%ld\n",
2770 current_count_sectors);
2771 if (CT(COMMAND) == FD_READ)
2773 if (CT(COMMAND) == FD_WRITE)
2777 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2778 current_count_sectors > blk_rq_sectors(current_req)) {
2779 DPRINT("buffer overrun in direct transfer\n");
2781 } else if (raw_cmd->length < current_count_sectors << 9) {
2782 DPRINT("more sectors than bytes\n");
2783 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2784 pr_info("sectors=%ld\n", current_count_sectors);
2786 if (raw_cmd->length == 0) {
2787 DPRINT("zero dma transfer attempted from make_raw_request\n");
2791 virtualdmabug_workaround();
2796 * Round-robin between our available drives, doing one request from each
2798 static int set_next_request(void)
2800 struct request_queue *q;
2801 int old_pos = fdc_queue;
2804 q = disks[fdc_queue]->queue;
2805 if (++fdc_queue == N_DRIVE)
2808 current_req = blk_fetch_request(q);
2810 current_req->error_count = 0;
2814 } while (fdc_queue != old_pos);
2816 return current_req != NULL;
2819 static void redo_fd_request(void)
2825 if (current_drive < N_DRIVE)
2826 floppy_off(current_drive);
2832 spin_lock_irq(&floppy_lock);
2833 pending = set_next_request();
2834 spin_unlock_irq(&floppy_lock);
2841 drive = (long)current_req->rq_disk->private_data;
2843 reschedule_timeout(current_reqD, "redo fd request");
2846 raw_cmd = &default_raw_cmd;
2848 if (start_motor(redo_fd_request))
2851 disk_change(current_drive);
2852 if (test_bit(current_drive, &fake_change) ||
2853 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2854 DPRINT("disk absent or changed during operation\n");
2858 if (!_floppy) { /* Autodetection */
2860 DRS->probed_format = 0;
2861 if (next_valid_format()) {
2862 DPRINT("no autodetectable formats\n");
2869 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2872 errors = &(current_req->error_count);
2873 tmp = make_raw_rw_request();
2879 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2881 schedule_bh(floppy_start);
2882 debugt(__func__, "queue fd request");
2886 static const struct cont_t rw_cont = {
2887 .interrupt = rw_interrupt,
2888 .redo = redo_fd_request,
2889 .error = bad_flp_intr,
2890 .done = request_done
2893 static void process_fd_request(void)
2896 schedule_bh(redo_fd_request);
2899 static void do_fd_request(struct request_queue *q)
2901 if (WARN(max_buffer_sectors == 0,
2902 "VFS: %s called on non-open device\n", __func__))
2905 if (WARN(atomic_read(&usage_count) == 0,
2906 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n",
2907 current_req, (long)blk_rq_pos(current_req),
2908 (unsigned long long) current_req->cmd_flags))
2911 if (test_and_set_bit(0, &fdc_busy)) {
2912 /* fdc busy, this new request will be treated when the
2913 current one is done */
2914 is_alive(__func__, "old request running");
2917 command_status = FD_COMMAND_NONE;
2918 __reschedule_timeout(MAXTIMEOUT, "fd_request");
2920 process_fd_request();
2921 is_alive(__func__, "");
2924 static const struct cont_t poll_cont = {
2925 .interrupt = success_and_wakeup,
2926 .redo = floppy_ready,
2927 .error = generic_failure,
2928 .done = generic_done
2931 static int poll_drive(bool interruptible, int flag)
2933 /* no auto-sense, just clear dcl */
2934 raw_cmd = &default_raw_cmd;
2935 raw_cmd->flags = flag;
2937 raw_cmd->cmd_count = 0;
2939 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2940 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2942 return wait_til_done(floppy_ready, interruptible);
2946 * User triggered reset
2947 * ====================
2950 static void reset_intr(void)
2952 pr_info("weird, reset interrupt called\n");
2955 static const struct cont_t reset_cont = {
2956 .interrupt = reset_intr,
2957 .redo = success_and_wakeup,
2958 .error = generic_failure,
2959 .done = generic_done
2962 static int user_reset_fdc(int drive, int arg, bool interruptible)
2966 if (lock_fdc(drive))
2969 if (arg == FD_RESET_ALWAYS)
2973 ret = wait_til_done(reset_fdc, interruptible);
2977 process_fd_request();
2982 * Misc Ioctl's and support
2983 * ========================
2985 static inline int fd_copyout(void __user *param, const void *address,
2988 return copy_to_user(param, address, size) ? -EFAULT : 0;
2991 static inline int fd_copyin(void __user *param, void *address,
2994 return copy_from_user(address, param, size) ? -EFAULT : 0;
2997 static const char *drive_name(int type, int drive)
2999 struct floppy_struct *floppy;
3002 floppy = floppy_type + type;
3004 if (UDP->native_format)
3005 floppy = floppy_type + UDP->native_format;
3010 return floppy->name;
3016 static void raw_cmd_done(int flag)
3021 raw_cmd->flags |= FD_RAW_FAILURE;
3022 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3024 raw_cmd->reply_count = inr;
3025 if (raw_cmd->reply_count > MAX_REPLIES)
3026 raw_cmd->reply_count = 0;
3027 for (i = 0; i < raw_cmd->reply_count; i++)
3028 raw_cmd->reply[i] = reply_buffer[i];
3030 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3031 unsigned long flags;
3032 flags = claim_dma_lock();
3033 raw_cmd->length = fd_get_dma_residue();
3034 release_dma_lock(flags);
3037 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3038 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3039 raw_cmd->flags |= FD_RAW_FAILURE;
3041 if (disk_change(current_drive))
3042 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3044 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3045 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3046 motor_off_callback(current_drive);
3048 if (raw_cmd->next &&
3049 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3050 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3051 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3052 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3053 raw_cmd = raw_cmd->next;
3060 static const struct cont_t raw_cmd_cont = {
3061 .interrupt = success_and_wakeup,
3062 .redo = floppy_start,
3063 .error = generic_failure,
3064 .done = raw_cmd_done
3067 static int raw_cmd_copyout(int cmd, void __user *param,
3068 struct floppy_raw_cmd *ptr)
3073 struct floppy_raw_cmd cmd = *ptr;
3075 cmd.kernel_data = NULL;
3076 ret = copy_to_user(param, &cmd, sizeof(cmd));
3079 param += sizeof(struct floppy_raw_cmd);
3080 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3081 if (ptr->length >= 0 &&
3082 ptr->length <= ptr->buffer_length) {
3083 long length = ptr->buffer_length - ptr->length;
3084 ret = fd_copyout(ptr->data, ptr->kernel_data,
3096 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3098 struct floppy_raw_cmd *next;
3099 struct floppy_raw_cmd *this;
3104 if (this->buffer_length) {
3105 fd_dma_mem_free((unsigned long)this->kernel_data,
3106 this->buffer_length);
3107 this->buffer_length = 0;
3115 static int raw_cmd_copyin(int cmd, void __user *param,
3116 struct floppy_raw_cmd **rcmd)
3118 struct floppy_raw_cmd *ptr;
3125 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL);
3129 ret = copy_from_user(ptr, param, sizeof(*ptr));
3131 ptr->buffer_length = 0;
3132 ptr->kernel_data = NULL;
3135 param += sizeof(struct floppy_raw_cmd);
3136 if (ptr->cmd_count > 33)
3137 /* the command may now also take up the space
3138 * initially intended for the reply & the
3139 * reply count. Needed for long 82078 commands
3140 * such as RESTORE, which takes ... 17 command
3141 * bytes. Murphy's law #137: When you reserve
3142 * 16 bytes for a structure, you'll one day
3143 * discover that you really need 17...
3147 for (i = 0; i < 16; i++)
3149 ptr->resultcode = 0;
3151 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3152 if (ptr->length <= 0)
3154 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3155 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3156 if (!ptr->kernel_data)
3158 ptr->buffer_length = ptr->length;
3160 if (ptr->flags & FD_RAW_WRITE) {
3161 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3166 if (ptr->flags & FD_RAW_MORE) {
3167 rcmd = &(ptr->next);
3175 static int raw_cmd_ioctl(int cmd, void __user *param)
3177 struct floppy_raw_cmd *my_raw_cmd;
3182 if (FDCS->rawcmd <= 1)
3184 for (drive = 0; drive < N_DRIVE; drive++) {
3185 if (FDC(drive) != fdc)
3187 if (drive == current_drive) {
3188 if (UDRS->fd_ref > 1) {
3192 } else if (UDRS->fd_ref) {
3201 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3203 raw_cmd_free(&my_raw_cmd);
3207 raw_cmd = my_raw_cmd;
3208 cont = &raw_cmd_cont;
3209 ret = wait_til_done(floppy_start, true);
3210 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3212 if (ret != -EINTR && FDCS->reset)
3215 DRS->track = NO_TRACK;
3217 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3220 raw_cmd_free(&my_raw_cmd);
3224 static int invalidate_drive(struct block_device *bdev)
3226 /* invalidate the buffer track to force a reread */
3227 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3228 process_fd_request();
3229 check_disk_change(bdev);
3233 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3234 int drive, int type, struct block_device *bdev)
3238 /* sanity checking for parameters. */
3241 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3242 /* check if reserved bits are set */
3243 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3246 if (!capable(CAP_SYS_ADMIN))
3248 mutex_lock(&open_lock);
3249 if (lock_fdc(drive)) {
3250 mutex_unlock(&open_lock);
3253 floppy_type[type] = *g;
3254 floppy_type[type].name = "user format";
3255 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3256 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3257 floppy_type[type].size + 1;
3258 process_fd_request();
3259 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3260 struct block_device *bdev = opened_bdev[cnt];
3261 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3263 __invalidate_device(bdev, true);
3265 mutex_unlock(&open_lock);
3269 if (lock_fdc(drive))
3271 if (cmd != FDDEFPRM) {
3272 /* notice a disk change immediately, else
3273 * we lose our settings immediately*/
3274 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3277 oldStretch = g->stretch;
3278 user_params[drive] = *g;
3279 if (buffer_drive == drive)
3280 SUPBOUND(buffer_max, user_params[drive].sect);
3281 current_type[drive] = &user_params[drive];
3282 floppy_sizes[drive] = user_params[drive].size;
3283 if (cmd == FDDEFPRM)
3284 DRS->keep_data = -1;
3287 /* invalidation. Invalidate only when needed, i.e.
3288 * when there are already sectors in the buffer cache
3289 * whose number will change. This is useful, because
3290 * mtools often changes the geometry of the disk after
3291 * looking at the boot block */
3292 if (DRS->maxblock > user_params[drive].sect ||
3294 ((user_params[drive].sect ^ oldStretch) &
3295 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3296 invalidate_drive(bdev);
3298 process_fd_request();
3303 /* handle obsolete ioctl's */
3304 static unsigned int ioctl_table[] = {
3332 static int normalize_ioctl(unsigned int *cmd, int *size)
3336 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3337 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3338 *size = _IOC_SIZE(*cmd);
3339 *cmd = ioctl_table[i];
3340 if (*size > _IOC_SIZE(*cmd)) {
3341 pr_info("ioctl not yet supported\n");
3350 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3353 *g = &floppy_type[type];
3355 if (lock_fdc(drive))
3357 if (poll_drive(false, 0) == -EINTR)
3359 process_fd_request();
3360 *g = current_type[drive];
3367 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3369 int drive = (long)bdev->bd_disk->private_data;
3370 int type = ITYPE(drive_state[drive].fd_device);
3371 struct floppy_struct *g;
3374 ret = get_floppy_geometry(drive, type, &g);
3378 geo->heads = g->head;
3379 geo->sectors = g->sect;
3380 geo->cylinders = g->track;
3384 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3385 unsigned long param)
3387 int drive = (long)bdev->bd_disk->private_data;
3388 int type = ITYPE(UDRS->fd_device);
3393 struct floppy_struct g; /* geometry */
3394 struct format_descr f;
3395 struct floppy_max_errors max_errors;
3396 struct floppy_drive_params dp;
3397 } inparam; /* parameters coming from user space */
3398 const void *outparam; /* parameters passed back to user space */
3400 /* convert compatibility eject ioctls into floppy eject ioctl.
3401 * We do this in order to provide a means to eject floppy disks before
3402 * installing the new fdutils package */
3403 if (cmd == CDROMEJECT || /* CD-ROM eject */
3404 cmd == 0x6470) { /* SunOS floppy eject */
3405 DPRINT("obsolete eject ioctl\n");
3406 DPRINT("please use floppycontrol --eject\n");
3410 if (!((cmd & 0xff00) == 0x0200))
3413 /* convert the old style command into a new style command */
3414 ret = normalize_ioctl(&cmd, &size);
3418 /* permission checks */
3419 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3420 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3423 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3427 memset(&inparam, 0, sizeof(inparam));
3428 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3429 ret = fd_copyin((void __user *)param, &inparam, size);
3436 if (UDRS->fd_ref != 1)
3437 /* somebody else has this drive open */
3439 if (lock_fdc(drive))
3442 /* do the actual eject. Fails on
3443 * non-Sparc architectures */
3444 ret = fd_eject(UNIT(drive));
3446 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3447 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3448 process_fd_request();
3451 if (lock_fdc(drive))
3453 current_type[drive] = NULL;
3454 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3455 UDRS->keep_data = 0;
3456 return invalidate_drive(bdev);
3459 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3461 ret = get_floppy_geometry(drive, type,
3462 (struct floppy_struct **)&outparam);
3467 UDP->flags |= FTD_MSG;
3470 UDP->flags &= ~FTD_MSG;
3473 if (lock_fdc(drive))
3475 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3478 process_fd_request();
3479 if (ret & FD_VERIFY)
3481 if (!(ret & FD_DISK_WRITABLE))
3485 if (UDRS->fd_ref != 1)
3487 return do_format(drive, &inparam.f);
3490 if (lock_fdc(drive))
3492 return invalidate_drive(bdev);
3493 case FDSETEMSGTRESH:
3494 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3497 outparam = &UDP->max_errors;
3500 UDP->max_errors = inparam.max_errors;
3503 outparam = drive_name(type, drive);
3504 SUPBOUND(size, strlen((const char *)outparam) + 1);
3513 if (lock_fdc(drive))
3515 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3517 process_fd_request();
3523 return user_reset_fdc(drive, (int)param, true);
3528 memset(UDRWE, 0, sizeof(*UDRWE));
3536 if (lock_fdc(drive))
3539 i = raw_cmd_ioctl(cmd, (void __user *)param);
3542 process_fd_request();
3545 if (lock_fdc(drive))
3548 process_fd_request();
3554 if (_IOC_DIR(cmd) & _IOC_READ)
3555 return fd_copyout((void __user *)param, outparam, size);
3560 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3561 unsigned int cmd, unsigned long param)
3565 mutex_lock(&floppy_mutex);
3566 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3567 mutex_unlock(&floppy_mutex);
3572 #ifdef CONFIG_COMPAT
3574 struct compat_floppy_drive_params {
3576 compat_ulong_t max_dtr;
3580 compat_ulong_t spinup;
3581 compat_ulong_t spindown;
3582 unsigned char spindown_offset;
3583 unsigned char select_delay;
3585 unsigned char tracks;
3586 compat_ulong_t timeout;
3587 unsigned char interleave_sect;
3588 struct floppy_max_errors max_errors;
3591 short autodetect[8];
3592 compat_int_t checkfreq;
3593 compat_int_t native_format;
3596 struct compat_floppy_drive_struct {
3598 compat_ulong_t spinup_date;
3599 compat_ulong_t select_date;
3600 compat_ulong_t first_read_date;
3601 short probed_format;
3605 compat_int_t generation;
3606 compat_int_t keep_data;
3607 compat_int_t fd_ref;
3608 compat_int_t fd_device;
3609 compat_int_t last_checked;
3610 compat_caddr_t dmabuf;
3611 compat_int_t bufblocks;
3614 struct compat_floppy_fdc_state {
3618 unsigned char version;
3620 compat_ulong_t address;
3621 unsigned int rawcmd:2;
3622 unsigned int reset:1;
3623 unsigned int need_configure:1;
3624 unsigned int perp_mode:2;
3625 unsigned int has_fifo:1;
3626 unsigned int driver_version;
3627 unsigned char track[4];
3630 struct compat_floppy_write_errors {
3631 unsigned int write_errors;
3632 compat_ulong_t first_error_sector;
3633 compat_int_t first_error_generation;
3634 compat_ulong_t last_error_sector;
3635 compat_int_t last_error_generation;
3636 compat_uint_t badness;
3639 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
3640 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
3641 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
3642 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
3643 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
3644 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
3645 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
3646 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
3648 static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3649 struct compat_floppy_struct __user *arg)
3651 struct floppy_struct v;
3655 BUILD_BUG_ON(offsetof(struct floppy_struct, name) !=
3656 offsetof(struct compat_floppy_struct, name));
3658 if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL)))
3661 memset(&v, 0, sizeof(struct floppy_struct));
3662 if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name)))
3665 mutex_lock(&floppy_mutex);
3666 drive = (long)bdev->bd_disk->private_data;
3667 type = ITYPE(UDRS->fd_device);
3668 err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM,
3669 &v, drive, type, bdev);
3670 mutex_unlock(&floppy_mutex);
3674 static int compat_get_prm(int drive,
3675 struct compat_floppy_struct __user *arg)
3677 struct compat_floppy_struct v;
3678 struct floppy_struct *p;
3681 memset(&v, 0, sizeof(v));
3682 mutex_lock(&floppy_mutex);
3683 err = get_floppy_geometry(drive, ITYPE(UDRS->fd_device), &p);
3685 mutex_unlock(&floppy_mutex);
3688 memcpy(&v, p, offsetof(struct floppy_struct, name));
3689 mutex_unlock(&floppy_mutex);
3690 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct)))
3695 static int compat_setdrvprm(int drive,
3696 struct compat_floppy_drive_params __user *arg)
3698 struct compat_floppy_drive_params v;
3700 if (!capable(CAP_SYS_ADMIN))
3702 if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params)))
3704 mutex_lock(&floppy_mutex);
3706 UDP->max_dtr = v.max_dtr;
3710 UDP->spinup = v.spinup;
3711 UDP->spindown = v.spindown;
3712 UDP->spindown_offset = v.spindown_offset;
3713 UDP->select_delay = v.select_delay;
3715 UDP->tracks = v.tracks;
3716 UDP->timeout = v.timeout;
3717 UDP->interleave_sect = v.interleave_sect;
3718 UDP->max_errors = v.max_errors;
3719 UDP->flags = v.flags;
3720 UDP->read_track = v.read_track;
3721 memcpy(UDP->autodetect, v.autodetect, sizeof(v.autodetect));
3722 UDP->checkfreq = v.checkfreq;
3723 UDP->native_format = v.native_format;
3724 mutex_unlock(&floppy_mutex);
3728 static int compat_getdrvprm(int drive,
3729 struct compat_floppy_drive_params __user *arg)
3731 struct compat_floppy_drive_params v;
3733 memset(&v, 0, sizeof(struct compat_floppy_drive_params));
3734 mutex_lock(&floppy_mutex);
3736 v.max_dtr = UDP->max_dtr;
3740 v.spinup = UDP->spinup;
3741 v.spindown = UDP->spindown;
3742 v.spindown_offset = UDP->spindown_offset;
3743 v.select_delay = UDP->select_delay;
3745 v.tracks = UDP->tracks;
3746 v.timeout = UDP->timeout;
3747 v.interleave_sect = UDP->interleave_sect;
3748 v.max_errors = UDP->max_errors;
3749 v.flags = UDP->flags;
3750 v.read_track = UDP->read_track;
3751 memcpy(v.autodetect, UDP->autodetect, sizeof(v.autodetect));
3752 v.checkfreq = UDP->checkfreq;
3753 v.native_format = UDP->native_format;
3754 mutex_unlock(&floppy_mutex);
3756 if (copy_from_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
3761 static int compat_getdrvstat(int drive, bool poll,
3762 struct compat_floppy_drive_struct __user *arg)
3764 struct compat_floppy_drive_struct v;
3766 memset(&v, 0, sizeof(struct compat_floppy_drive_struct));
3767 mutex_lock(&floppy_mutex);
3770 if (lock_fdc(drive))
3772 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3774 process_fd_request();
3776 v.spinup_date = UDRS->spinup_date;
3777 v.select_date = UDRS->select_date;
3778 v.first_read_date = UDRS->first_read_date;
3779 v.probed_format = UDRS->probed_format;
3780 v.track = UDRS->track;
3781 v.maxblock = UDRS->maxblock;
3782 v.maxtrack = UDRS->maxtrack;
3783 v.generation = UDRS->generation;
3784 v.keep_data = UDRS->keep_data;
3785 v.fd_ref = UDRS->fd_ref;
3786 v.fd_device = UDRS->fd_device;
3787 v.last_checked = UDRS->last_checked;
3788 v.dmabuf = (uintptr_t)UDRS->dmabuf;
3789 v.bufblocks = UDRS->bufblocks;
3790 mutex_unlock(&floppy_mutex);
3792 if (copy_from_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
3796 mutex_unlock(&floppy_mutex);
3800 static int compat_getfdcstat(int drive,
3801 struct compat_floppy_fdc_state __user *arg)
3803 struct compat_floppy_fdc_state v32;
3804 struct floppy_fdc_state v;
3806 mutex_lock(&floppy_mutex);
3808 mutex_unlock(&floppy_mutex);
3810 memset(&v32, 0, sizeof(struct compat_floppy_fdc_state));
3811 v32.spec1 = v.spec1;
3812 v32.spec2 = v.spec2;
3814 v32.version = v.version;
3816 v32.address = v.address;
3817 v32.rawcmd = v.rawcmd;
3818 v32.reset = v.reset;
3819 v32.need_configure = v.need_configure;
3820 v32.perp_mode = v.perp_mode;
3821 v32.has_fifo = v.has_fifo;
3822 v32.driver_version = v.driver_version;
3823 memcpy(v32.track, v.track, 4);
3824 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state)))
3829 static int compat_werrorget(int drive,
3830 struct compat_floppy_write_errors __user *arg)
3832 struct compat_floppy_write_errors v32;
3833 struct floppy_write_errors v;
3835 memset(&v32, 0, sizeof(struct compat_floppy_write_errors));
3836 mutex_lock(&floppy_mutex);
3838 mutex_unlock(&floppy_mutex);
3839 v32.write_errors = v.write_errors;
3840 v32.first_error_sector = v.first_error_sector;
3841 v32.first_error_generation = v.first_error_generation;
3842 v32.last_error_sector = v.last_error_sector;
3843 v32.last_error_generation = v.last_error_generation;
3844 v32.badness = v.badness;
3845 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors)))
3850 static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3851 unsigned long param)
3853 int drive = (long)bdev->bd_disk->private_data;
3857 case FDSETEMSGTRESH:
3865 return fd_ioctl(bdev, mode, cmd, param);
3872 return fd_ioctl(bdev, mode, cmd,
3873 (unsigned long)compat_ptr(param));
3876 return compat_set_geometry(bdev, mode, cmd, compat_ptr(param));
3878 return compat_get_prm(drive, compat_ptr(param));
3880 return compat_setdrvprm(drive, compat_ptr(param));
3882 return compat_getdrvprm(drive, compat_ptr(param));
3883 case FDPOLLDRVSTAT32:
3884 return compat_getdrvstat(drive, true, compat_ptr(param));
3885 case FDGETDRVSTAT32:
3886 return compat_getdrvstat(drive, false, compat_ptr(param));
3887 case FDGETFDCSTAT32:
3888 return compat_getfdcstat(drive, compat_ptr(param));
3890 return compat_werrorget(drive, compat_ptr(param));
3896 static void __init config_types(void)
3898 bool has_drive = false;
3901 /* read drive info out of physical CMOS */
3904 UDP->cmos = FLOPPY0_TYPE;
3906 if (!UDP->cmos && FLOPPY1_TYPE)
3907 UDP->cmos = FLOPPY1_TYPE;
3909 /* FIXME: additional physical CMOS drive detection should go here */
3911 for (drive = 0; drive < N_DRIVE; drive++) {
3912 unsigned int type = UDP->cmos;
3913 struct floppy_drive_params *params;
3914 const char *name = NULL;
3917 if (type < ARRAY_SIZE(default_drive_params)) {
3918 params = &default_drive_params[type].params;
3920 name = default_drive_params[type].name;
3921 allowed_drive_mask |= 1 << drive;
3923 allowed_drive_mask &= ~(1 << drive);
3925 params = &default_drive_params[0].params;
3926 snprintf(temparea, sizeof(temparea),
3927 "unknown type %d (usb?)", type);
3931 const char *prepend;
3935 pr_info("Floppy drive(s):");
3940 pr_cont("%s fd%d is %s", prepend, drive, name);
3949 static void floppy_release(struct gendisk *disk, fmode_t mode)
3951 int drive = (long)disk->private_data;
3953 mutex_lock(&floppy_mutex);
3954 mutex_lock(&open_lock);
3955 if (!UDRS->fd_ref--) {
3956 DPRINT("floppy_release with fd_ref == 0");
3960 opened_bdev[drive] = NULL;
3961 mutex_unlock(&open_lock);
3962 mutex_unlock(&floppy_mutex);
3966 * floppy_open check for aliasing (/dev/fd0 can be the same as
3967 * /dev/PS0 etc), and disallows simultaneous access to the same
3968 * drive with different device numbers.
3970 static int floppy_open(struct block_device *bdev, fmode_t mode)
3972 int drive = (long)bdev->bd_disk->private_data;
3973 int old_dev, new_dev;
3978 mutex_lock(&floppy_mutex);
3979 mutex_lock(&open_lock);
3980 old_dev = UDRS->fd_device;
3981 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3984 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3985 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3986 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3991 opened_bdev[drive] = bdev;
3995 if (!floppy_track_buffer) {
3996 /* if opening an ED drive, reserve a big buffer,
3997 * else reserve a small one */
3998 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3999 try = 64; /* Only 48 actually useful */
4001 try = 32; /* Only 24 actually useful */
4003 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4004 if (!tmp && !floppy_track_buffer) {
4005 try >>= 1; /* buffer only one side */
4007 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4009 if (!tmp && !floppy_track_buffer)
4010 fallback_on_nodma_alloc(&tmp, 2048 * try);
4011 if (!tmp && !floppy_track_buffer) {
4012 DPRINT("Unable to allocate DMA memory\n");
4015 if (floppy_track_buffer) {
4017 fd_dma_mem_free((unsigned long)tmp, try * 1024);
4019 buffer_min = buffer_max = -1;
4020 floppy_track_buffer = tmp;
4021 max_buffer_sectors = try;
4025 new_dev = MINOR(bdev->bd_dev);
4026 UDRS->fd_device = new_dev;
4027 set_capacity(disks[drive], floppy_sizes[new_dev]);
4028 if (old_dev != -1 && old_dev != new_dev) {
4029 if (buffer_drive == drive)
4033 if (UFDCS->rawcmd == 1)
4036 if (!(mode & FMODE_NDELAY)) {
4037 if (mode & (FMODE_READ|FMODE_WRITE)) {
4038 UDRS->last_checked = 0;
4039 clear_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
4040 check_disk_change(bdev);
4041 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
4043 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags))
4047 if ((mode & FMODE_WRITE) &&
4048 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
4051 mutex_unlock(&open_lock);
4052 mutex_unlock(&floppy_mutex);
4058 opened_bdev[drive] = NULL;
4060 mutex_unlock(&open_lock);
4061 mutex_unlock(&floppy_mutex);
4066 * Check if the disk has been changed or if a change has been faked.
4068 static unsigned int floppy_check_events(struct gendisk *disk,
4069 unsigned int clearing)
4071 int drive = (long)disk->private_data;
4073 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4074 test_bit(FD_VERIFY_BIT, &UDRS->flags))
4075 return DISK_EVENT_MEDIA_CHANGE;
4077 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
4078 if (lock_fdc(drive))
4080 poll_drive(false, 0);
4081 process_fd_request();
4084 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4085 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
4086 test_bit(drive, &fake_change) ||
4087 drive_no_geom(drive))
4088 return DISK_EVENT_MEDIA_CHANGE;
4093 * This implements "read block 0" for floppy_revalidate().
4094 * Needed for format autodetection, checking whether there is
4095 * a disk in the drive, and whether that disk is writable.
4100 struct completion complete;
4103 static void floppy_rb0_cb(struct bio *bio)
4105 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private;
4106 int drive = cbdata->drive;
4108 if (bio->bi_status) {
4109 pr_info("floppy: error %d while reading block 0\n",
4111 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
4113 complete(&cbdata->complete);
4116 static int __floppy_read_block_0(struct block_device *bdev, int drive)
4119 struct bio_vec bio_vec;
4121 struct rb0_cbdata cbdata;
4124 page = alloc_page(GFP_NOIO);
4126 process_fd_request();
4130 size = bdev->bd_block_size;
4134 cbdata.drive = drive;
4136 bio_init(&bio, &bio_vec, 1);
4138 bio_add_page(&bio, page, size, 0);
4140 bio.bi_iter.bi_sector = 0;
4141 bio.bi_flags |= (1 << BIO_QUIET);
4142 bio.bi_private = &cbdata;
4143 bio.bi_end_io = floppy_rb0_cb;
4144 bio_set_op_attrs(&bio, REQ_OP_READ, 0);
4147 process_fd_request();
4149 init_completion(&cbdata.complete);
4150 wait_for_completion(&cbdata.complete);
4157 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
4158 * the bootblock (block 0). "Autodetection" is also needed to check whether
4159 * there is a disk in the drive at all... Thus we also do it for fixed
4160 * geometry formats */
4161 static int floppy_revalidate(struct gendisk *disk)
4163 int drive = (long)disk->private_data;
4167 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4168 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
4169 test_bit(drive, &fake_change) ||
4170 drive_no_geom(drive)) {
4171 if (WARN(atomic_read(&usage_count) == 0,
4172 "VFS: revalidate called on non-open device.\n"))
4175 res = lock_fdc(drive);
4178 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4179 test_bit(FD_VERIFY_BIT, &UDRS->flags));
4180 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
4181 process_fd_request(); /*already done by another thread */
4186 if (buffer_drive == drive)
4188 clear_bit(drive, &fake_change);
4189 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4192 if (drive_no_geom(drive)) {
4194 res = __floppy_read_block_0(opened_bdev[drive], drive);
4197 poll_drive(false, FD_RAW_NEED_DISK);
4198 process_fd_request();
4201 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
4205 static const struct block_device_operations floppy_fops = {
4206 .owner = THIS_MODULE,
4207 .open = floppy_open,
4208 .release = floppy_release,
4210 .getgeo = fd_getgeo,
4211 .check_events = floppy_check_events,
4212 .revalidate_disk = floppy_revalidate,
4213 #ifdef CONFIG_COMPAT
4214 .compat_ioctl = fd_compat_ioctl,
4219 * Floppy Driver initialization
4220 * =============================
4223 /* Determine the floppy disk controller type */
4224 /* This routine was written by David C. Niemi */
4225 static char __init get_fdc_version(void)
4229 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
4234 return FDC_NONE; /* No FDC present ??? */
4235 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4236 pr_info("FDC %d is an 8272A\n", fdc);
4237 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
4240 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
4245 if (!fdc_configure()) {
4246 pr_info("FDC %d is an 82072\n", fdc);
4247 return FDC_82072; /* 82072 doesn't know CONFIGURE */
4250 output_byte(FD_PERPENDICULAR);
4251 if (need_more_output() == MORE_OUTPUT) {
4254 pr_info("FDC %d is an 82072A\n", fdc);
4255 return FDC_82072A; /* 82072A as found on Sparcs. */
4258 output_byte(FD_UNLOCK);
4260 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4261 pr_info("FDC %d is a pre-1991 82077\n", fdc);
4262 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
4265 if ((r != 1) || (reply_buffer[0] != 0x00)) {
4266 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
4270 output_byte(FD_PARTID);
4273 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
4277 if (reply_buffer[0] == 0x80) {
4278 pr_info("FDC %d is a post-1991 82077\n", fdc);
4279 return FDC_82077; /* Revised 82077AA passes all the tests */
4281 switch (reply_buffer[0] >> 5) {
4283 /* Either a 82078-1 or a 82078SL running at 5Volt */
4284 pr_info("FDC %d is an 82078.\n", fdc);
4287 pr_info("FDC %d is a 44pin 82078\n", fdc);
4290 pr_info("FDC %d is a S82078B\n", fdc);
4293 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
4296 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4297 fdc, reply_buffer[0] >> 5);
4298 return FDC_82078_UNKN;
4300 } /* get_fdc_version */
4302 /* lilo configuration */
4304 static void __init floppy_set_flags(int *ints, int param, int param2)
4308 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4310 default_drive_params[i].params.flags |= param2;
4312 default_drive_params[i].params.flags &= ~param2;
4314 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4317 static void __init daring(int *ints, int param, int param2)
4321 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4323 default_drive_params[i].params.select_delay = 0;
4324 default_drive_params[i].params.flags |=
4325 FD_SILENT_DCL_CLEAR;
4327 default_drive_params[i].params.select_delay =
4329 default_drive_params[i].params.flags &=
4330 ~FD_SILENT_DCL_CLEAR;
4333 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4336 static void __init set_cmos(int *ints, int dummy, int dummy2)
4338 int current_drive = 0;
4341 DPRINT("wrong number of parameters for CMOS\n");
4344 current_drive = ints[1];
4345 if (current_drive < 0 || current_drive >= 8) {
4346 DPRINT("bad drive for set_cmos\n");
4350 if (current_drive >= 4 && !FDC2)
4354 DPRINT("setting CMOS code to %d\n", ints[2]);
4357 static struct param_table {
4359 void (*fn) (int *ints, int param, int param2);
4363 } config_params[] __initdata = {
4364 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4365 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4366 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4367 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4368 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4369 {"daring", daring, NULL, 1, 0},
4371 {"two_fdc", NULL, &FDC2, 0x370, 0},
4372 {"one_fdc", NULL, &FDC2, 0, 0},
4374 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4375 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4376 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4377 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4378 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4379 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4380 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4381 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4382 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4383 {"nofifo", NULL, &no_fifo, 0x20, 0},
4384 {"usefifo", NULL, &no_fifo, 0, 0},
4385 {"cmos", set_cmos, NULL, 0, 0},
4386 {"slow", NULL, &slow_floppy, 1, 0},
4387 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4388 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4389 {"L40SX", NULL, &print_unex, 0, 0}
4394 static int __init floppy_setup(char *str)
4400 str = get_options(str, ARRAY_SIZE(ints), ints);
4402 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4403 if (strcmp(str, config_params[i].name) == 0) {
4407 param = config_params[i].def_param;
4408 if (config_params[i].fn)
4409 config_params[i].fn(ints, param,
4412 if (config_params[i].var) {
4413 DPRINT("%s=%d\n", str, param);
4414 *config_params[i].var = param;
4421 DPRINT("unknown floppy option [%s]\n", str);
4423 DPRINT("allowed options are:");
4424 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4425 pr_cont(" %s", config_params[i].name);
4428 DPRINT("botched floppy option\n");
4429 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4433 static int have_no_fdc = -ENODEV;
4435 static ssize_t floppy_cmos_show(struct device *dev,
4436 struct device_attribute *attr, char *buf)
4438 struct platform_device *p = to_platform_device(dev);
4442 return sprintf(buf, "%X\n", UDP->cmos);
4445 static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4447 static struct attribute *floppy_dev_attrs[] = {
4448 &dev_attr_cmos.attr,
4452 ATTRIBUTE_GROUPS(floppy_dev);
4454 static void floppy_device_release(struct device *dev)
4458 static int floppy_resume(struct device *dev)
4462 for (fdc = 0; fdc < N_FDC; fdc++)
4463 if (FDCS->address != -1)
4464 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4469 static const struct dev_pm_ops floppy_pm_ops = {
4470 .resume = floppy_resume,
4471 .restore = floppy_resume,
4474 static struct platform_driver floppy_driver = {
4477 .pm = &floppy_pm_ops,
4481 static struct platform_device floppy_device[N_DRIVE];
4483 static bool floppy_available(int drive)
4485 if (!(allowed_drive_mask & (1 << drive)))
4487 if (fdc_state[FDC(drive)].version == FDC_NONE)
4492 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4494 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4495 if (drive >= N_DRIVE || !floppy_available(drive))
4497 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4500 return get_disk(disks[drive]);
4503 static int __init do_floppy_init(void)
4505 int i, unit, drive, err;
4508 interruptjiffies = resultjiffies = jiffies;
4510 #if defined(CONFIG_PPC)
4511 if (check_legacy_ioport(FDC1))
4517 floppy_wq = alloc_ordered_workqueue("floppy", 0);
4521 for (drive = 0; drive < N_DRIVE; drive++) {
4522 disks[drive] = alloc_disk(1);
4523 if (!disks[drive]) {
4528 disks[drive]->queue = blk_init_queue(do_fd_request, &floppy_lock);
4529 if (!disks[drive]->queue) {
4534 blk_queue_bounce_limit(disks[drive]->queue, BLK_BOUNCE_HIGH);
4535 blk_queue_max_hw_sectors(disks[drive]->queue, 64);
4536 disks[drive]->major = FLOPPY_MAJOR;
4537 disks[drive]->first_minor = TOMINOR(drive);
4538 disks[drive]->fops = &floppy_fops;
4539 sprintf(disks[drive]->disk_name, "fd%d", drive);
4541 setup_timer(&motor_off_timer[drive], motor_off_callback, drive);
4544 err = register_blkdev(FLOPPY_MAJOR, "fd");
4548 err = platform_driver_register(&floppy_driver);
4550 goto out_unreg_blkdev;
4552 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4553 floppy_find, NULL, NULL);
4555 for (i = 0; i < 256; i++)
4557 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4559 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4561 reschedule_timeout(MAXTIMEOUT, "floppy init");
4564 for (i = 0; i < N_FDC; i++) {
4566 memset(FDCS, 0, sizeof(*FDCS));
4569 #if defined(__sparc__) || defined(__mc68000__)
4570 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4574 FDCS->version = FDC_82072A;
4578 use_virtual_dma = can_use_virtual_dma & 1;
4579 fdc_state[0].address = FDC1;
4580 if (fdc_state[0].address == -1) {
4581 cancel_delayed_work(&fd_timeout);
4583 goto out_unreg_region;
4586 fdc_state[1].address = FDC2;
4589 fdc = 0; /* reset fdc in case of unexpected interrupt */
4590 err = floppy_grab_irq_and_dma();
4592 cancel_delayed_work(&fd_timeout);
4594 goto out_unreg_region;
4597 /* initialise drive state */
4598 for (drive = 0; drive < N_DRIVE; drive++) {
4599 memset(UDRS, 0, sizeof(*UDRS));
4600 memset(UDRWE, 0, sizeof(*UDRWE));
4601 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4602 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4603 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4604 UDRS->fd_device = -1;
4605 floppy_track_buffer = NULL;
4606 max_buffer_sectors = 0;
4609 * Small 10 msec delay to let through any interrupt that
4610 * initialization might have triggered, to not
4611 * confuse detection:
4615 for (i = 0; i < N_FDC; i++) {
4617 FDCS->driver_version = FD_DRIVER_VERSION;
4618 for (unit = 0; unit < 4; unit++)
4619 FDCS->track[unit] = 0;
4620 if (FDCS->address == -1)
4623 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4624 /* free ioports reserved by floppy_grab_irq_and_dma() */
4625 floppy_release_regions(fdc);
4627 FDCS->version = FDC_NONE;
4630 /* Try to determine the floppy controller type */
4631 FDCS->version = get_fdc_version();
4632 if (FDCS->version == FDC_NONE) {
4633 /* free ioports reserved by floppy_grab_irq_and_dma() */
4634 floppy_release_regions(fdc);
4638 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4639 can_use_virtual_dma = 0;
4642 /* Not all FDCs seem to be able to handle the version command
4643 * properly, so force a reset for the standard FDC clones,
4644 * to avoid interrupt garbage.
4646 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4649 cancel_delayed_work(&fd_timeout);
4653 DPRINT("no floppy controllers found\n");
4655 goto out_release_dma;
4658 for (drive = 0; drive < N_DRIVE; drive++) {
4659 if (!floppy_available(drive))
4662 floppy_device[drive].name = floppy_device_name;
4663 floppy_device[drive].id = drive;
4664 floppy_device[drive].dev.release = floppy_device_release;
4665 floppy_device[drive].dev.groups = floppy_dev_groups;
4667 err = platform_device_register(&floppy_device[drive]);
4669 goto out_remove_drives;
4671 /* to be cleaned up... */
4672 disks[drive]->private_data = (void *)(long)drive;
4673 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4674 device_add_disk(&floppy_device[drive].dev, disks[drive]);
4681 if (floppy_available(drive)) {
4682 del_gendisk(disks[drive]);
4683 platform_device_unregister(&floppy_device[drive]);
4687 if (atomic_read(&usage_count))
4688 floppy_release_irq_and_dma();
4690 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4691 platform_driver_unregister(&floppy_driver);
4693 unregister_blkdev(FLOPPY_MAJOR, "fd");
4695 destroy_workqueue(floppy_wq);
4696 for (drive = 0; drive < N_DRIVE; drive++) {
4699 if (disks[drive]->queue) {
4700 del_timer_sync(&motor_off_timer[drive]);
4701 blk_cleanup_queue(disks[drive]->queue);
4702 disks[drive]->queue = NULL;
4704 put_disk(disks[drive]);
4710 static __init void floppy_async_init(void *data, async_cookie_t cookie)
4716 static int __init floppy_init(void)
4719 return do_floppy_init();
4721 /* Don't hold up the bootup by the floppy initialization */
4722 async_schedule(floppy_async_init, NULL);
4727 static const struct io_region {
4732 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4734 /* address + 6 is reserved, and may be taken by IDE.
4735 * Unfortunately, Adaptec doesn't know this :-(, */
4739 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4741 while (p != io_regions) {
4743 release_region(FDCS->address + p->offset, p->size);
4747 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4749 static int floppy_request_regions(int fdc)
4751 const struct io_region *p;
4753 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4754 if (!request_region(FDCS->address + p->offset,
4755 p->size, "floppy")) {
4756 DPRINT("Floppy io-port 0x%04lx in use\n",
4757 FDCS->address + p->offset);
4758 floppy_release_allocated_regions(fdc, p);
4765 static void floppy_release_regions(int fdc)
4767 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4770 static int floppy_grab_irq_and_dma(void)
4772 if (atomic_inc_return(&usage_count) > 1)
4776 * We might have scheduled a free_irq(), wait it to
4779 flush_workqueue(floppy_wq);
4781 if (fd_request_irq()) {
4782 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4784 atomic_dec(&usage_count);
4787 if (fd_request_dma()) {
4788 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4790 if (can_use_virtual_dma & 2)
4791 use_virtual_dma = can_use_virtual_dma = 1;
4792 if (!(can_use_virtual_dma & 1)) {
4794 atomic_dec(&usage_count);
4799 for (fdc = 0; fdc < N_FDC; fdc++) {
4800 if (FDCS->address != -1) {
4801 if (floppy_request_regions(fdc))
4805 for (fdc = 0; fdc < N_FDC; fdc++) {
4806 if (FDCS->address != -1) {
4808 fd_outb(FDCS->dor, FD_DOR);
4812 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4814 for (fdc = 0; fdc < N_FDC; fdc++)
4815 if (FDCS->address != -1)
4816 fd_outb(FDCS->dor, FD_DOR);
4818 * The driver will try and free resources and relies on us
4819 * to know if they were allocated or not.
4822 irqdma_allocated = 1;
4828 floppy_release_regions(fdc);
4829 atomic_dec(&usage_count);
4833 static void floppy_release_irq_and_dma(void)
4840 unsigned long tmpaddr;
4842 if (!atomic_dec_and_test(&usage_count))
4845 if (irqdma_allocated) {
4849 irqdma_allocated = 0;
4856 if (floppy_track_buffer && max_buffer_sectors) {
4857 tmpsize = max_buffer_sectors * 1024;
4858 tmpaddr = (unsigned long)floppy_track_buffer;
4859 floppy_track_buffer = NULL;
4860 max_buffer_sectors = 0;
4861 buffer_min = buffer_max = -1;
4862 fd_dma_mem_free(tmpaddr, tmpsize);
4865 for (drive = 0; drive < N_FDC * 4; drive++)
4866 if (timer_pending(motor_off_timer + drive))
4867 pr_info("motor off timer %d still active\n", drive);
4870 if (delayed_work_pending(&fd_timeout))
4871 pr_info("floppy timer still active:%s\n", timeout_message);
4872 if (delayed_work_pending(&fd_timer))
4873 pr_info("auxiliary floppy timer still active\n");
4874 if (work_pending(&floppy_work))
4875 pr_info("work still pending\n");
4877 for (fdc = 0; fdc < N_FDC; fdc++)
4878 if (FDCS->address != -1)
4879 floppy_release_regions(fdc);
4885 static char *floppy;
4887 static void __init parse_floppy_cfg_string(char *cfg)
4893 while (*cfg && *cfg != ' ' && *cfg != '\t')
4904 static int __init floppy_module_init(void)
4907 parse_floppy_cfg_string(floppy);
4908 return floppy_init();
4910 module_init(floppy_module_init);
4912 static void __exit floppy_module_exit(void)
4916 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4917 unregister_blkdev(FLOPPY_MAJOR, "fd");
4918 platform_driver_unregister(&floppy_driver);
4920 destroy_workqueue(floppy_wq);
4922 for (drive = 0; drive < N_DRIVE; drive++) {
4923 del_timer_sync(&motor_off_timer[drive]);
4925 if (floppy_available(drive)) {
4926 del_gendisk(disks[drive]);
4927 platform_device_unregister(&floppy_device[drive]);
4929 blk_cleanup_queue(disks[drive]->queue);
4932 * These disks have not called add_disk(). Don't put down
4933 * queue reference in put_disk().
4935 if (!(allowed_drive_mask & (1 << drive)) ||
4936 fdc_state[FDC(drive)].version == FDC_NONE)
4937 disks[drive]->queue = NULL;
4939 put_disk(disks[drive]);
4942 cancel_delayed_work_sync(&fd_timeout);
4943 cancel_delayed_work_sync(&fd_timer);
4945 if (atomic_read(&usage_count))
4946 floppy_release_irq_and_dma();
4948 /* eject disk, if any */
4952 module_exit(floppy_module_exit);
4954 module_param(floppy, charp, 0);
4955 module_param(FLOPPY_IRQ, int, 0);
4956 module_param(FLOPPY_DMA, int, 0);
4957 MODULE_AUTHOR("Alain L. Knaff");
4958 MODULE_SUPPORTED_DEVICE("fd");
4959 MODULE_LICENSE("GPL");
4961 /* This doesn't actually get used other than for module information */
4962 static const struct pnp_device_id floppy_pnpids[] = {
4967 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4971 __setup("floppy=", floppy_setup);
4972 module_init(floppy_init)
4975 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);