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 unsigned int new_fdc = fdc;
853 if (drive >= 0 && drive < N_DRIVE) {
854 new_fdc = FDC(drive);
855 current_drive = drive;
857 if (new_fdc >= N_FDC) {
858 pr_info("bad fdc value\n");
864 set_dor(1 - fdc, ~8, 0);
866 if (FDCS->rawcmd == 2)
868 if (fd_inb(FD_STATUS) != STATUS_READY)
872 /* locks the driver */
873 static int lock_fdc(int drive)
875 if (WARN(atomic_read(&usage_count) == 0,
876 "Trying to lock fdc while usage count=0\n"))
879 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
882 command_status = FD_COMMAND_NONE;
884 reschedule_timeout(drive, "lock fdc");
889 /* unlocks the driver */
890 static void unlock_fdc(void)
892 if (!test_bit(0, &fdc_busy))
893 DPRINT("FDC access conflict!\n");
896 command_status = FD_COMMAND_NONE;
897 cancel_delayed_work(&fd_timeout);
900 clear_bit(0, &fdc_busy);
904 /* switches the motor off after a given timeout */
905 static void motor_off_callback(unsigned long nr)
907 unsigned char mask = ~(0x10 << UNIT(nr));
909 set_dor(FDC(nr), mask, 0);
912 /* schedules motor off */
913 static void floppy_off(unsigned int drive)
915 unsigned long volatile delta;
916 int fdc = FDC(drive);
918 if (!(FDCS->dor & (0x10 << UNIT(drive))))
921 del_timer(motor_off_timer + drive);
923 /* make spindle stop in a position which minimizes spinup time
926 delta = jiffies - UDRS->first_read_date + HZ -
927 UDP->spindown_offset;
928 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
929 motor_off_timer[drive].expires =
930 jiffies + UDP->spindown - delta;
932 add_timer(motor_off_timer + drive);
936 * cycle through all N_DRIVE floppy drives, for disk change testing.
937 * stopping at current drive. This is done before any long operation, to
938 * be sure to have up to date disk change information.
940 static void scandrives(void)
946 if (DP->select_delay)
949 saved_drive = current_drive;
950 for (i = 0; i < N_DRIVE; i++) {
951 drive = (saved_drive + i + 1) % N_DRIVE;
952 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
953 continue; /* skip closed drives */
955 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
956 (0x10 << UNIT(drive))))
957 /* switch the motor off again, if it was off to
959 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
961 set_fdc(saved_drive);
964 static void empty(void)
968 static void (*floppy_work_fn)(void);
970 static void floppy_work_workfn(struct work_struct *work)
975 static DECLARE_WORK(floppy_work, floppy_work_workfn);
977 static void schedule_bh(void (*handler)(void))
979 WARN_ON(work_pending(&floppy_work));
981 floppy_work_fn = handler;
982 queue_work(floppy_wq, &floppy_work);
985 static void (*fd_timer_fn)(void) = NULL;
987 static void fd_timer_workfn(struct work_struct *work)
992 static DECLARE_DELAYED_WORK(fd_timer, fd_timer_workfn);
994 static void cancel_activity(void)
997 cancel_delayed_work_sync(&fd_timer);
998 cancel_work_sync(&floppy_work);
1001 /* this function makes sure that the disk stays in the drive during the
1003 static void fd_watchdog(void)
1005 debug_dcl(DP->flags, "calling disk change from watchdog\n");
1007 if (disk_change(current_drive)) {
1008 DPRINT("disk removed during i/o\n");
1013 cancel_delayed_work(&fd_timer);
1014 fd_timer_fn = fd_watchdog;
1015 queue_delayed_work(floppy_wq, &fd_timer, HZ / 10);
1019 static void main_command_interrupt(void)
1021 cancel_delayed_work(&fd_timer);
1025 /* waits for a delay (spinup or select) to pass */
1026 static int fd_wait_for_completion(unsigned long expires,
1027 void (*function)(void))
1030 reset_fdc(); /* do the reset during sleep to win time
1031 * if we don't need to sleep, it's a good
1032 * occasion anyways */
1036 if (time_before(jiffies, expires)) {
1037 cancel_delayed_work(&fd_timer);
1038 fd_timer_fn = function;
1039 queue_delayed_work(floppy_wq, &fd_timer, expires - jiffies);
1045 static void setup_DMA(void)
1049 if (raw_cmd->length == 0) {
1052 pr_info("zero dma transfer size:");
1053 for (i = 0; i < raw_cmd->cmd_count; i++)
1054 pr_cont("%x,", raw_cmd->cmd[i]);
1060 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1061 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1066 f = claim_dma_lock();
1069 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1070 (raw_cmd->flags & FD_RAW_READ) ?
1071 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1072 release_dma_lock(f);
1077 release_dma_lock(f);
1080 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1081 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1082 DMA_MODE_READ : DMA_MODE_WRITE);
1083 fd_set_dma_addr(raw_cmd->kernel_data);
1084 fd_set_dma_count(raw_cmd->length);
1085 virtual_dma_port = FDCS->address;
1087 release_dma_lock(f);
1091 static void show_floppy(void);
1093 /* waits until the fdc becomes ready */
1094 static int wait_til_ready(void)
1101 for (counter = 0; counter < 10000; counter++) {
1102 status = fd_inb(FD_STATUS);
1103 if (status & STATUS_READY)
1107 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1114 /* sends a command byte to the fdc */
1115 static int output_byte(char byte)
1117 int status = wait_til_ready();
1122 if (is_ready_state(status)) {
1123 fd_outb(byte, FD_DATA);
1124 output_log[output_log_pos].data = byte;
1125 output_log[output_log_pos].status = status;
1126 output_log[output_log_pos].jiffies = jiffies;
1127 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1132 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1139 /* gets the response from the fdc */
1140 static int result(void)
1145 for (i = 0; i < MAX_REPLIES; i++) {
1146 status = wait_til_ready();
1149 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1150 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1151 resultjiffies = jiffies;
1155 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1156 reply_buffer[i] = fd_inb(FD_DATA);
1161 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1169 #define MORE_OUTPUT -2
1170 /* does the fdc need more output? */
1171 static int need_more_output(void)
1173 int status = wait_til_ready();
1178 if (is_ready_state(status))
1184 /* Set perpendicular mode as required, based on data rate, if supported.
1185 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1187 static void perpendicular_mode(void)
1189 unsigned char perp_mode;
1191 if (raw_cmd->rate & 0x40) {
1192 switch (raw_cmd->rate & 3) {
1200 DPRINT("Invalid data rate for perpendicular mode!\n");
1204 * convenient way to return to
1205 * redo without too much hassle
1206 * (deep stack et al.)
1213 if (FDCS->perp_mode == perp_mode)
1215 if (FDCS->version >= FDC_82077_ORIG) {
1216 output_byte(FD_PERPENDICULAR);
1217 output_byte(perp_mode);
1218 FDCS->perp_mode = perp_mode;
1219 } else if (perp_mode) {
1220 DPRINT("perpendicular mode not supported by this FDC.\n");
1222 } /* perpendicular_mode */
1224 static int fifo_depth = 0xa;
1227 static int fdc_configure(void)
1230 output_byte(FD_CONFIGURE);
1231 if (need_more_output() != MORE_OUTPUT)
1234 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1235 output_byte(0); /* pre-compensation from track
1240 #define NOMINAL_DTR 500
1242 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1243 * head load time, and DMA disable flag to values needed by floppy.
1245 * The value "dtr" is the data transfer rate in Kbps. It is needed
1246 * to account for the data rate-based scaling done by the 82072 and 82077
1247 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1250 * Note that changing the data transfer rate has a (probably deleterious)
1251 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1252 * fdc_specify is called again after each data transfer rate
1255 * srt: 1000 to 16000 in microseconds
1256 * hut: 16 to 240 milliseconds
1257 * hlt: 2 to 254 milliseconds
1259 * These values are rounded up to the next highest available delay time.
1261 static void fdc_specify(void)
1263 unsigned char spec1;
1264 unsigned char spec2;
1268 unsigned long dtr = NOMINAL_DTR;
1269 unsigned long scale_dtr = NOMINAL_DTR;
1270 int hlt_max_code = 0x7f;
1271 int hut_max_code = 0xf;
1273 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1275 FDCS->need_configure = 0;
1278 switch (raw_cmd->rate & 0x03) {
1284 if (FDCS->version >= FDC_82078) {
1285 /* chose the default rate table, not the one
1286 * where 1 = 2 Mbps */
1287 output_byte(FD_DRIVESPEC);
1288 if (need_more_output() == MORE_OUTPUT) {
1289 output_byte(UNIT(current_drive));
1299 if (FDCS->version >= FDC_82072) {
1301 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1302 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1305 /* Convert step rate from microseconds to milliseconds and 4 bits */
1306 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1313 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1316 else if (hlt > 0x7f)
1319 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1325 spec1 = (srt << 4) | hut;
1326 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1328 /* If these parameters did not change, just return with success */
1329 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1330 /* Go ahead and set spec1 and spec2 */
1331 output_byte(FD_SPECIFY);
1332 output_byte(FDCS->spec1 = spec1);
1333 output_byte(FDCS->spec2 = spec2);
1337 /* Set the FDC's data transfer rate on behalf of the specified drive.
1338 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1339 * of the specify command (i.e. using the fdc_specify function).
1341 static int fdc_dtr(void)
1343 /* If data rate not already set to desired value, set it. */
1344 if ((raw_cmd->rate & 3) == FDCS->dtr)
1348 fd_outb(raw_cmd->rate & 3, FD_DCR);
1350 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1351 * need a stabilization period of several milliseconds to be
1352 * enforced after data rate changes before R/W operations.
1353 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1355 FDCS->dtr = raw_cmd->rate & 3;
1356 return fd_wait_for_completion(jiffies + 2UL * HZ / 100, floppy_ready);
1359 static void tell_sector(void)
1361 pr_cont(": track %d, head %d, sector %d, size %d",
1362 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1365 static void print_errors(void)
1368 if (ST0 & ST0_ECE) {
1369 pr_cont("Recalibrate failed!");
1370 } else if (ST2 & ST2_CRC) {
1371 pr_cont("data CRC error");
1373 } else if (ST1 & ST1_CRC) {
1374 pr_cont("CRC error");
1376 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1379 pr_cont("sector not found");
1382 pr_cont("probe failed...");
1383 } else if (ST2 & ST2_WC) { /* seek error */
1384 pr_cont("wrong cylinder");
1385 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1386 pr_cont("bad cylinder");
1388 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1396 * OK, this error interpreting routine is called after a
1397 * DMA read/write has succeeded
1398 * or failed, so we check the results, and copy any buffers.
1399 * hhb: Added better error reporting.
1400 * ak: Made this into a separate routine.
1402 static int interpret_errors(void)
1407 DPRINT("-- FDC reply error\n");
1412 /* check IC to find cause of interrupt */
1413 switch (ST0 & ST0_INTR) {
1414 case 0x40: /* error occurred during command execution */
1416 return 0; /* occurs with pseudo-DMA */
1419 DPRINT("Drive is write protected\n");
1420 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1423 } else if (ST1 & ST1_ND) {
1424 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1425 } else if (ST1 & ST1_OR) {
1426 if (DP->flags & FTD_MSG)
1427 DPRINT("Over/Underrun - retrying\n");
1429 } else if (*errors >= DP->max_errors.reporting) {
1432 if (ST2 & ST2_WC || ST2 & ST2_BC)
1433 /* wrong cylinder => recal */
1434 DRS->track = NEED_2_RECAL;
1436 case 0x80: /* invalid command given */
1437 DPRINT("Invalid FDC command given!\n");
1441 DPRINT("Abnormal termination caused by polling\n");
1444 default: /* (0) Normal command termination */
1450 * This routine is called when everything should be correctly set up
1451 * for the transfer (i.e. floppy motor is on, the correct floppy is
1452 * selected, and the head is sitting on the right track).
1454 static void setup_rw_floppy(void)
1460 unsigned long ready_date;
1461 void (*function)(void);
1463 flags = raw_cmd->flags;
1464 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1465 flags |= FD_RAW_INTR;
1467 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1468 ready_date = DRS->spinup_date + DP->spinup;
1469 /* If spinup will take a long time, rerun scandrives
1470 * again just before spinup completion. Beware that
1471 * after scandrives, we must again wait for selection.
1473 if (time_after(ready_date, jiffies + DP->select_delay)) {
1474 ready_date -= DP->select_delay;
1475 function = floppy_start;
1477 function = setup_rw_floppy;
1479 /* wait until the floppy is spinning fast enough */
1480 if (fd_wait_for_completion(ready_date, function))
1483 dflags = DRS->flags;
1485 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1488 if (flags & FD_RAW_INTR)
1489 do_floppy = main_command_interrupt;
1492 for (i = 0; i < raw_cmd->cmd_count; i++)
1493 r |= output_byte(raw_cmd->cmd[i]);
1495 debugt(__func__, "rw_command");
1503 if (!(flags & FD_RAW_INTR)) {
1506 } else if (flags & FD_RAW_NEED_DISK)
1510 static int blind_seek;
1513 * This is the routine called after every seek (or recalibrate) interrupt
1514 * from the floppy controller.
1516 static void seek_interrupt(void)
1518 debugt(__func__, "");
1519 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1520 DPRINT("seek failed\n");
1521 DRS->track = NEED_2_RECAL;
1526 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1527 debug_dcl(DP->flags,
1528 "clearing NEWCHANGE flag because of effective seek\n");
1529 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1530 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1531 /* effective seek */
1532 DRS->select_date = jiffies;
1538 static void check_wp(void)
1540 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1541 /* check write protection */
1542 output_byte(FD_GETSTATUS);
1543 output_byte(UNIT(current_drive));
1544 if (result() != 1) {
1548 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1549 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1550 debug_dcl(DP->flags,
1551 "checking whether disk is write protected\n");
1552 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1554 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1556 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1560 static void seek_floppy(void)
1566 debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
1568 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1569 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1570 /* the media changed flag should be cleared after the seek.
1571 * If it isn't, this means that there is really no disk in
1574 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1579 if (DRS->track <= NEED_1_RECAL) {
1580 recalibrate_floppy();
1582 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1583 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1584 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1585 /* we seek to clear the media-changed condition. Does anybody
1586 * know a more elegant way, which works on all drives? */
1588 track = raw_cmd->track - 1;
1590 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1591 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1593 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1599 if (raw_cmd->track != DRS->track &&
1600 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1601 track = raw_cmd->track;
1608 do_floppy = seek_interrupt;
1609 output_byte(FD_SEEK);
1610 output_byte(UNIT(current_drive));
1611 if (output_byte(track) < 0) {
1615 debugt(__func__, "");
1618 static void recal_interrupt(void)
1620 debugt(__func__, "");
1623 else if (ST0 & ST0_ECE) {
1624 switch (DRS->track) {
1626 debugt(__func__, "need 1 recal");
1627 /* after a second recalibrate, we still haven't
1628 * reached track 0. Probably no drive. Raise an
1629 * error, as failing immediately might upset
1630 * computers possessed by the Devil :-) */
1635 debugt(__func__, "need 2 recal");
1636 /* If we already did a recalibrate,
1637 * and we are not at track 0, this
1638 * means we have moved. (The only way
1639 * not to move at recalibration is to
1640 * be already at track 0.) Clear the
1641 * new change flag */
1642 debug_dcl(DP->flags,
1643 "clearing NEWCHANGE flag because of second recalibrate\n");
1645 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1646 DRS->select_date = jiffies;
1649 debugt(__func__, "default");
1650 /* Recalibrate moves the head by at
1651 * most 80 steps. If after one
1652 * recalibrate we don't have reached
1653 * track 0, this might mean that we
1654 * started beyond track 80. Try
1656 DRS->track = NEED_1_RECAL;
1664 static void print_result(char *message, int inr)
1668 DPRINT("%s ", message);
1670 for (i = 0; i < inr; i++)
1671 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1675 /* interrupt handler. Note that this can be called externally on the Sparc */
1676 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1680 void (*handler)(void) = do_floppy;
1682 lasthandler = handler;
1683 interruptjiffies = jiffies;
1685 f = claim_dma_lock();
1687 release_dma_lock(f);
1690 if (fdc >= N_FDC || FDCS->address == -1) {
1691 /* we don't even know which FDC is the culprit */
1692 pr_info("DOR0=%x\n", fdc_state[0].dor);
1693 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1694 pr_info("handler=%pf\n", handler);
1695 is_alive(__func__, "bizarre fdc");
1700 /* We have to clear the reset flag here, because apparently on boxes
1701 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1702 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1703 * emission of the SENSEI's.
1704 * It is OK to emit floppy commands because we are in an interrupt
1705 * handler here, and thus we have to fear no interference of other
1709 do_print = !handler && print_unex && initialized;
1713 print_result("unexpected interrupt", inr);
1717 output_byte(FD_SENSEI);
1720 print_result("sensei", inr);
1722 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1723 inr == 2 && max_sensei);
1729 schedule_bh(handler);
1730 is_alive(__func__, "normal interrupt end");
1732 /* FIXME! Was it really for us? */
1736 static void recalibrate_floppy(void)
1738 debugt(__func__, "");
1739 do_floppy = recal_interrupt;
1740 output_byte(FD_RECALIBRATE);
1741 if (output_byte(UNIT(current_drive)) < 0)
1746 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1748 static void reset_interrupt(void)
1750 debugt(__func__, "");
1751 result(); /* get the status ready for set_fdc */
1753 pr_info("reset set in interrupt, calling %pf\n", cont->error);
1754 cont->error(); /* a reset just after a reset. BAD! */
1760 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1761 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1763 static void reset_fdc(void)
1765 unsigned long flags;
1767 do_floppy = reset_interrupt;
1771 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1772 /* Irrelevant for systems with true DMA (i386). */
1774 flags = claim_dma_lock();
1776 release_dma_lock(flags);
1778 if (FDCS->version >= FDC_82072A)
1779 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1781 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1782 udelay(FD_RESET_DELAY);
1783 fd_outb(FDCS->dor, FD_DOR);
1787 static void show_floppy(void)
1792 pr_info("floppy driver state\n");
1793 pr_info("-------------------\n");
1794 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1795 jiffies, interruptjiffies, jiffies - interruptjiffies,
1798 pr_info("timeout_message=%s\n", timeout_message);
1799 pr_info("last output bytes:\n");
1800 for (i = 0; i < OLOGSIZE; i++)
1801 pr_info("%2x %2x %lu\n",
1802 output_log[(i + output_log_pos) % OLOGSIZE].data,
1803 output_log[(i + output_log_pos) % OLOGSIZE].status,
1804 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1805 pr_info("last result at %lu\n", resultjiffies);
1806 pr_info("last redo_fd_request at %lu\n", lastredo);
1807 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1808 reply_buffer, resultsize, true);
1810 pr_info("status=%x\n", fd_inb(FD_STATUS));
1811 pr_info("fdc_busy=%lu\n", fdc_busy);
1813 pr_info("do_floppy=%pf\n", do_floppy);
1814 if (work_pending(&floppy_work))
1815 pr_info("floppy_work.func=%pf\n", floppy_work.func);
1816 if (delayed_work_pending(&fd_timer))
1817 pr_info("delayed work.function=%p expires=%ld\n",
1819 fd_timer.timer.expires - jiffies);
1820 if (delayed_work_pending(&fd_timeout))
1821 pr_info("timer_function=%p expires=%ld\n",
1822 fd_timeout.work.func,
1823 fd_timeout.timer.expires - jiffies);
1825 pr_info("cont=%p\n", cont);
1826 pr_info("current_req=%p\n", current_req);
1827 pr_info("command_status=%d\n", command_status);
1831 static void floppy_shutdown(struct work_struct *arg)
1833 unsigned long flags;
1839 flags = claim_dma_lock();
1841 release_dma_lock(flags);
1843 /* avoid dma going to a random drive after shutdown */
1846 DPRINT("floppy timeout called\n");
1850 cont->redo(); /* this will recall reset when needed */
1852 pr_info("no cont in shutdown!\n");
1853 process_fd_request();
1855 is_alive(__func__, "");
1858 /* start motor, check media-changed condition and write protection */
1859 static int start_motor(void (*function)(void))
1865 data = UNIT(current_drive);
1866 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1867 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1869 /* no read since this drive is running */
1870 DRS->first_read_date = 0;
1871 /* note motor start time if motor is not yet running */
1872 DRS->spinup_date = jiffies;
1873 data |= (0x10 << UNIT(current_drive));
1875 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1876 mask &= ~(0x10 << UNIT(current_drive));
1878 /* starts motor and selects floppy */
1879 del_timer(motor_off_timer + current_drive);
1880 set_dor(fdc, mask, data);
1882 /* wait_for_completion also schedules reset if needed. */
1883 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1887 static void floppy_ready(void)
1893 if (start_motor(floppy_ready))
1898 debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1899 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1900 disk_change(current_drive) && !DP->select_delay)
1901 twaddle(); /* this clears the dcl on certain
1902 * drive/controller combinations */
1904 #ifdef fd_chose_dma_mode
1905 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1906 unsigned long flags = claim_dma_lock();
1907 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1908 release_dma_lock(flags);
1912 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1913 perpendicular_mode();
1914 fdc_specify(); /* must be done here because of hut, hlt ... */
1917 if ((raw_cmd->flags & FD_RAW_READ) ||
1918 (raw_cmd->flags & FD_RAW_WRITE))
1924 static void floppy_start(void)
1926 reschedule_timeout(current_reqD, "floppy start");
1929 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1930 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1935 * ========================================================================
1936 * here ends the bottom half. Exported routines are:
1937 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1938 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1939 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1941 * ========================================================================
1944 * General purpose continuations.
1945 * ==============================
1948 static void do_wakeup(void)
1950 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1952 command_status += 2;
1953 wake_up(&command_done);
1956 static const struct cont_t wakeup_cont = {
1960 .done = (done_f)empty
1963 static const struct cont_t intr_cont = {
1965 .redo = process_fd_request,
1967 .done = (done_f)empty
1970 static int wait_til_done(void (*handler)(void), bool interruptible)
1974 schedule_bh(handler);
1977 wait_event_interruptible(command_done, command_status >= 2);
1979 wait_event(command_done, command_status >= 2);
1981 if (command_status < 2) {
1989 command_status = FD_COMMAND_ERROR;
1990 if (command_status == FD_COMMAND_OKAY)
1994 command_status = FD_COMMAND_NONE;
1998 static void generic_done(int result)
2000 command_status = result;
2001 cont = &wakeup_cont;
2004 static void generic_success(void)
2009 static void generic_failure(void)
2014 static void success_and_wakeup(void)
2021 * formatting and rw support.
2022 * ==========================
2025 static int next_valid_format(void)
2029 probed_format = DRS->probed_format;
2031 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2032 DRS->probed_format = 0;
2035 if (floppy_type[DP->autodetect[probed_format]].sect) {
2036 DRS->probed_format = probed_format;
2043 static void bad_flp_intr(void)
2048 DRS->probed_format++;
2049 if (!next_valid_format())
2052 err_count = ++(*errors);
2053 INFBOUND(DRWE->badness, err_count);
2054 if (err_count > DP->max_errors.abort)
2056 if (err_count > DP->max_errors.reset)
2058 else if (err_count > DP->max_errors.recal)
2059 DRS->track = NEED_2_RECAL;
2062 static void set_floppy(int drive)
2064 int type = ITYPE(UDRS->fd_device);
2067 _floppy = floppy_type + type;
2069 _floppy = current_type[drive];
2073 * formatting support.
2074 * ===================
2076 static void format_interrupt(void)
2078 switch (interpret_errors()) {
2089 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2090 #define CT(x) ((x) | 0xc0)
2092 static void setup_format_params(int track)
2100 unsigned char track, head, sect, size;
2101 } *here = (struct fparm *)floppy_track_buffer;
2103 raw_cmd = &default_raw_cmd;
2104 raw_cmd->track = track;
2106 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2107 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2108 raw_cmd->rate = _floppy->rate & 0x43;
2109 raw_cmd->cmd_count = NR_F;
2110 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2111 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2112 F_SIZECODE = FD_SIZECODE(_floppy);
2113 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2114 F_GAP = _floppy->fmt_gap;
2115 F_FILL = FD_FILL_BYTE;
2117 raw_cmd->kernel_data = floppy_track_buffer;
2118 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2120 if (!F_SECT_PER_TRACK)
2123 /* allow for about 30ms for data transport per track */
2124 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2126 /* a ``cylinder'' is two tracks plus a little stepping time */
2127 track_shift = 2 * head_shift + 3;
2129 /* position of logical sector 1 on this track */
2130 n = (track_shift * format_req.track + head_shift * format_req.head)
2133 /* determine interleave */
2135 if (_floppy->fmt_gap < 0x22)
2138 /* initialize field */
2139 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2140 here[count].track = format_req.track;
2141 here[count].head = format_req.head;
2142 here[count].sect = 0;
2143 here[count].size = F_SIZECODE;
2145 /* place logical sectors */
2146 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2147 here[n].sect = count;
2148 n = (n + il) % F_SECT_PER_TRACK;
2149 if (here[n].sect) { /* sector busy, find next free sector */
2151 if (n >= F_SECT_PER_TRACK) {
2152 n -= F_SECT_PER_TRACK;
2153 while (here[n].sect)
2158 if (_floppy->stretch & FD_SECTBASEMASK) {
2159 for (count = 0; count < F_SECT_PER_TRACK; count++)
2160 here[count].sect += FD_SECTBASE(_floppy) - 1;
2164 static void redo_format(void)
2167 setup_format_params(format_req.track << STRETCH(_floppy));
2169 debugt(__func__, "queue format request");
2172 static const struct cont_t format_cont = {
2173 .interrupt = format_interrupt,
2174 .redo = redo_format,
2175 .error = bad_flp_intr,
2176 .done = generic_done
2179 static int do_format(int drive, struct format_descr *tmp_format_req)
2183 if (lock_fdc(drive))
2188 _floppy->track > DP->tracks ||
2189 tmp_format_req->track >= _floppy->track ||
2190 tmp_format_req->head >= _floppy->head ||
2191 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2192 !_floppy->fmt_gap) {
2193 process_fd_request();
2196 format_req = *tmp_format_req;
2198 cont = &format_cont;
2199 errors = &format_errors;
2200 ret = wait_til_done(redo_format, true);
2203 process_fd_request();
2208 * Buffer read/write and support
2209 * =============================
2212 static void floppy_end_request(struct request *req, blk_status_t error)
2214 unsigned int nr_sectors = current_count_sectors;
2215 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2217 /* current_count_sectors can be zero if transfer failed */
2219 nr_sectors = blk_rq_cur_sectors(req);
2220 if (__blk_end_request(req, error, nr_sectors << 9))
2223 /* We're done with the request */
2228 /* new request_done. Can handle physical sectors which are smaller than a
2230 static void request_done(int uptodate)
2232 struct request *req = current_req;
2233 struct request_queue *q;
2234 unsigned long flags;
2236 char msg[sizeof("request done ") + sizeof(int) * 3];
2239 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2240 reschedule_timeout(MAXTIMEOUT, msg);
2243 pr_info("floppy.c: no request in request_done\n");
2250 /* maintain values for invalidation on geometry
2252 block = current_count_sectors + blk_rq_pos(req);
2253 INFBOUND(DRS->maxblock, block);
2254 if (block > _floppy->sect)
2257 /* unlock chained buffers */
2258 spin_lock_irqsave(q->queue_lock, flags);
2259 floppy_end_request(req, 0);
2260 spin_unlock_irqrestore(q->queue_lock, flags);
2262 if (rq_data_dir(req) == WRITE) {
2263 /* record write error information */
2264 DRWE->write_errors++;
2265 if (DRWE->write_errors == 1) {
2266 DRWE->first_error_sector = blk_rq_pos(req);
2267 DRWE->first_error_generation = DRS->generation;
2269 DRWE->last_error_sector = blk_rq_pos(req);
2270 DRWE->last_error_generation = DRS->generation;
2272 spin_lock_irqsave(q->queue_lock, flags);
2273 floppy_end_request(req, BLK_STS_IOERR);
2274 spin_unlock_irqrestore(q->queue_lock, flags);
2278 /* Interrupt handler evaluating the result of the r/w operation */
2279 static void rw_interrupt(void)
2287 /* some Toshiba floppy controllers occasionnally seem to
2288 * return bogus interrupts after read/write operations, which
2289 * can be recognized by a bad head number (>= 2) */
2293 if (!DRS->first_read_date)
2294 DRS->first_read_date = jiffies;
2297 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2309 nr_sectors = (((R_TRACK - TRACK) * heads +
2310 R_HEAD - HEAD) * SECT_PER_TRACK +
2311 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2313 if (nr_sectors / ssize >
2314 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2315 DPRINT("long rw: %x instead of %lx\n",
2316 nr_sectors, current_count_sectors);
2317 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2318 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2319 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2320 pr_info("heads=%d eoc=%d\n", heads, eoc);
2321 pr_info("spt=%d st=%d ss=%d\n",
2322 SECT_PER_TRACK, fsector_t, ssize);
2323 pr_info("in_sector_offset=%d\n", in_sector_offset);
2326 nr_sectors -= in_sector_offset;
2327 INFBOUND(nr_sectors, 0);
2328 SUPBOUND(current_count_sectors, nr_sectors);
2330 switch (interpret_errors()) {
2335 if (!current_count_sectors) {
2342 if (!current_count_sectors) {
2346 current_type[current_drive] = _floppy;
2347 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2352 if (DP->flags & FTD_MSG)
2353 DPRINT("Auto-detected floppy type %s in fd%d\n",
2354 _floppy->name, current_drive);
2355 current_type[current_drive] = _floppy;
2356 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2360 if (CT(COMMAND) != FD_READ ||
2361 raw_cmd->kernel_data == bio_data(current_req->bio)) {
2362 /* transfer directly from buffer */
2364 } else if (CT(COMMAND) == FD_READ) {
2365 buffer_track = raw_cmd->track;
2366 buffer_drive = current_drive;
2367 INFBOUND(buffer_max, nr_sectors + fsector_t);
2372 /* Compute maximal contiguous buffer size. */
2373 static int buffer_chain_size(void)
2377 struct req_iterator iter;
2380 base = bio_data(current_req->bio);
2383 rq_for_each_segment(bv, current_req, iter) {
2384 if (page_address(bv.bv_page) + bv.bv_offset != base + size)
2393 /* Compute the maximal transfer size */
2394 static int transfer_size(int ssize, int max_sector, int max_size)
2396 SUPBOUND(max_sector, fsector_t + max_size);
2399 max_sector -= (max_sector % _floppy->sect) % ssize;
2401 /* transfer size, beginning not aligned */
2402 current_count_sectors = max_sector - fsector_t;
2408 * Move data from/to the track buffer to/from the buffer cache.
2410 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2412 int remaining; /* number of transferred 512-byte sectors */
2417 struct req_iterator iter;
2419 max_sector = transfer_size(ssize,
2420 min(max_sector, max_sector_2),
2421 blk_rq_sectors(current_req));
2423 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2424 buffer_max > fsector_t + blk_rq_sectors(current_req))
2425 current_count_sectors = min_t(int, buffer_max - fsector_t,
2426 blk_rq_sectors(current_req));
2428 remaining = current_count_sectors << 9;
2429 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2430 DPRINT("in copy buffer\n");
2431 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2432 pr_info("remaining=%d\n", remaining >> 9);
2433 pr_info("current_req->nr_sectors=%u\n",
2434 blk_rq_sectors(current_req));
2435 pr_info("current_req->current_nr_sectors=%u\n",
2436 blk_rq_cur_sectors(current_req));
2437 pr_info("max_sector=%d\n", max_sector);
2438 pr_info("ssize=%d\n", ssize);
2441 buffer_max = max(max_sector, buffer_max);
2443 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2445 size = blk_rq_cur_bytes(current_req);
2447 rq_for_each_segment(bv, current_req, iter) {
2452 SUPBOUND(size, remaining);
2454 buffer = page_address(bv.bv_page) + bv.bv_offset;
2455 if (dma_buffer + size >
2456 floppy_track_buffer + (max_buffer_sectors << 10) ||
2457 dma_buffer < floppy_track_buffer) {
2458 DPRINT("buffer overrun in copy buffer %d\n",
2459 (int)((floppy_track_buffer - dma_buffer) >> 9));
2460 pr_info("fsector_t=%d buffer_min=%d\n",
2461 fsector_t, buffer_min);
2462 pr_info("current_count_sectors=%ld\n",
2463 current_count_sectors);
2464 if (CT(COMMAND) == FD_READ)
2466 if (CT(COMMAND) == FD_WRITE)
2470 if (((unsigned long)buffer) % 512)
2471 DPRINT("%p buffer not aligned\n", buffer);
2473 if (CT(COMMAND) == FD_READ)
2474 memcpy(buffer, dma_buffer, size);
2476 memcpy(dma_buffer, buffer, size);
2483 max_sector -= remaining >> 9;
2484 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2488 /* work around a bug in pseudo DMA
2489 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2490 * sending data. Hence we need a different way to signal the
2491 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2492 * does not work with MT, hence we can only transfer one head at
2495 static void virtualdmabug_workaround(void)
2500 if (CT(COMMAND) == FD_WRITE) {
2501 COMMAND &= ~0x80; /* switch off multiple track mode */
2503 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2504 end_sector = SECTOR + hard_sectors - 1;
2505 if (end_sector > SECT_PER_TRACK) {
2506 pr_info("too many sectors %d > %d\n",
2507 end_sector, SECT_PER_TRACK);
2510 SECT_PER_TRACK = end_sector;
2511 /* make sure SECT_PER_TRACK
2512 * points to end of transfer */
2517 * Formulate a read/write request.
2518 * this routine decides where to load the data (directly to buffer, or to
2519 * tmp floppy area), how much data to load (the size of the buffer, the whole
2520 * track, or a single sector)
2521 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2522 * allocation on the fly, it should be done here. No other part should need
2526 static int make_raw_rw_request(void)
2528 int aligned_sector_t;
2534 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2537 set_fdc((long)current_req->rq_disk->private_data);
2539 raw_cmd = &default_raw_cmd;
2540 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2541 raw_cmd->cmd_count = NR_RW;
2542 if (rq_data_dir(current_req) == READ) {
2543 raw_cmd->flags |= FD_RAW_READ;
2544 COMMAND = FM_MODE(_floppy, FD_READ);
2545 } else if (rq_data_dir(current_req) == WRITE) {
2546 raw_cmd->flags |= FD_RAW_WRITE;
2547 COMMAND = FM_MODE(_floppy, FD_WRITE);
2549 DPRINT("%s: unknown command\n", __func__);
2553 max_sector = _floppy->sect * _floppy->head;
2555 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2556 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2557 if (_floppy->track && TRACK >= _floppy->track) {
2558 if (blk_rq_cur_sectors(current_req) & 1) {
2559 current_count_sectors = 1;
2564 HEAD = fsector_t / _floppy->sect;
2566 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2567 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2568 fsector_t < _floppy->sect)
2569 max_sector = _floppy->sect;
2571 /* 2M disks have phantom sectors on the first track */
2572 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2573 max_sector = 2 * _floppy->sect / 3;
2574 if (fsector_t >= max_sector) {
2575 current_count_sectors =
2576 min_t(int, _floppy->sect - fsector_t,
2577 blk_rq_sectors(current_req));
2582 SIZECODE = FD_SIZECODE(_floppy);
2583 raw_cmd->rate = _floppy->rate & 0x43;
2584 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2591 raw_cmd->track = TRACK << STRETCH(_floppy);
2592 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2594 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2595 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2596 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2597 FD_SECTBASE(_floppy);
2599 /* tracksize describes the size which can be filled up with sectors
2602 tracksize = _floppy->sect - _floppy->sect % ssize;
2603 if (tracksize < _floppy->sect) {
2605 if (tracksize <= fsector_t % _floppy->sect)
2608 /* if we are beyond tracksize, fill up using smaller sectors */
2609 while (tracksize <= fsector_t % _floppy->sect) {
2610 while (tracksize + ssize > _floppy->sect) {
2618 max_sector = HEAD * _floppy->sect + tracksize;
2619 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2620 max_sector = _floppy->sect;
2621 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2622 /* for virtual DMA bug workaround */
2623 max_sector = _floppy->sect;
2626 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2627 aligned_sector_t = fsector_t - in_sector_offset;
2628 max_size = blk_rq_sectors(current_req);
2629 if ((raw_cmd->track == buffer_track) &&
2630 (current_drive == buffer_drive) &&
2631 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2632 /* data already in track buffer */
2633 if (CT(COMMAND) == FD_READ) {
2634 copy_buffer(1, max_sector, buffer_max);
2637 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2638 if (CT(COMMAND) == FD_WRITE) {
2639 unsigned int sectors;
2641 sectors = fsector_t + blk_rq_sectors(current_req);
2642 if (sectors > ssize && sectors < ssize + ssize)
2643 max_size = ssize + ssize;
2647 raw_cmd->flags &= ~FD_RAW_WRITE;
2648 raw_cmd->flags |= FD_RAW_READ;
2649 COMMAND = FM_MODE(_floppy, FD_READ);
2650 } else if ((unsigned long)bio_data(current_req->bio) < MAX_DMA_ADDRESS) {
2651 unsigned long dma_limit;
2652 int direct, indirect;
2655 transfer_size(ssize, max_sector,
2656 max_buffer_sectors * 2) - fsector_t;
2659 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2660 * on a 64 bit machine!
2662 max_size = buffer_chain_size();
2663 dma_limit = (MAX_DMA_ADDRESS -
2664 ((unsigned long)bio_data(current_req->bio))) >> 9;
2665 if ((unsigned long)max_size > dma_limit)
2666 max_size = dma_limit;
2667 /* 64 kb boundaries */
2668 if (CROSS_64KB(bio_data(current_req->bio), max_size << 9))
2670 ((unsigned long)bio_data(current_req->bio)) %
2672 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2674 * We try to read tracks, but if we get too many errors, we
2675 * go back to reading just one sector at a time.
2677 * This means we should be able to read a sector even if there
2678 * are other bad sectors on this track.
2681 (indirect * 2 > direct * 3 &&
2682 *errors < DP->max_errors.read_track &&
2684 (DP->read_track & (1 << DRS->probed_format)))))) {
2685 max_size = blk_rq_sectors(current_req);
2687 raw_cmd->kernel_data = bio_data(current_req->bio);
2688 raw_cmd->length = current_count_sectors << 9;
2689 if (raw_cmd->length == 0) {
2690 DPRINT("%s: zero dma transfer attempted\n", __func__);
2691 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2692 indirect, direct, fsector_t);
2695 virtualdmabug_workaround();
2700 if (CT(COMMAND) == FD_READ)
2701 max_size = max_sector; /* unbounded */
2703 /* claim buffer track if needed */
2704 if (buffer_track != raw_cmd->track || /* bad track */
2705 buffer_drive != current_drive || /* bad drive */
2706 fsector_t > buffer_max ||
2707 fsector_t < buffer_min ||
2708 ((CT(COMMAND) == FD_READ ||
2709 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2710 max_sector > 2 * max_buffer_sectors + buffer_min &&
2711 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2712 /* not enough space */
2714 buffer_drive = current_drive;
2715 buffer_max = buffer_min = aligned_sector_t;
2717 raw_cmd->kernel_data = floppy_track_buffer +
2718 ((aligned_sector_t - buffer_min) << 9);
2720 if (CT(COMMAND) == FD_WRITE) {
2721 /* copy write buffer to track buffer.
2722 * if we get here, we know that the write
2723 * is either aligned or the data already in the buffer
2724 * (buffer will be overwritten) */
2725 if (in_sector_offset && buffer_track == -1)
2726 DPRINT("internal error offset !=0 on write\n");
2727 buffer_track = raw_cmd->track;
2728 buffer_drive = current_drive;
2729 copy_buffer(ssize, max_sector,
2730 2 * max_buffer_sectors + buffer_min);
2732 transfer_size(ssize, max_sector,
2733 2 * max_buffer_sectors + buffer_min -
2736 /* round up current_count_sectors to get dma xfer size */
2737 raw_cmd->length = in_sector_offset + current_count_sectors;
2738 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2739 raw_cmd->length <<= 9;
2740 if ((raw_cmd->length < current_count_sectors << 9) ||
2741 (raw_cmd->kernel_data != bio_data(current_req->bio) &&
2742 CT(COMMAND) == FD_WRITE &&
2743 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2744 aligned_sector_t < buffer_min)) ||
2745 raw_cmd->length % (128 << SIZECODE) ||
2746 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2747 DPRINT("fractionary current count b=%lx s=%lx\n",
2748 raw_cmd->length, current_count_sectors);
2749 if (raw_cmd->kernel_data != bio_data(current_req->bio))
2750 pr_info("addr=%d, length=%ld\n",
2751 (int)((raw_cmd->kernel_data -
2752 floppy_track_buffer) >> 9),
2753 current_count_sectors);
2754 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2755 fsector_t, aligned_sector_t, max_sector, max_size);
2756 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2757 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2758 COMMAND, SECTOR, HEAD, TRACK);
2759 pr_info("buffer drive=%d\n", buffer_drive);
2760 pr_info("buffer track=%d\n", buffer_track);
2761 pr_info("buffer_min=%d\n", buffer_min);
2762 pr_info("buffer_max=%d\n", buffer_max);
2766 if (raw_cmd->kernel_data != bio_data(current_req->bio)) {
2767 if (raw_cmd->kernel_data < floppy_track_buffer ||
2768 current_count_sectors < 0 ||
2769 raw_cmd->length < 0 ||
2770 raw_cmd->kernel_data + raw_cmd->length >
2771 floppy_track_buffer + (max_buffer_sectors << 10)) {
2772 DPRINT("buffer overrun in schedule dma\n");
2773 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2774 fsector_t, buffer_min, raw_cmd->length >> 9);
2775 pr_info("current_count_sectors=%ld\n",
2776 current_count_sectors);
2777 if (CT(COMMAND) == FD_READ)
2779 if (CT(COMMAND) == FD_WRITE)
2783 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2784 current_count_sectors > blk_rq_sectors(current_req)) {
2785 DPRINT("buffer overrun in direct transfer\n");
2787 } else if (raw_cmd->length < current_count_sectors << 9) {
2788 DPRINT("more sectors than bytes\n");
2789 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2790 pr_info("sectors=%ld\n", current_count_sectors);
2792 if (raw_cmd->length == 0) {
2793 DPRINT("zero dma transfer attempted from make_raw_request\n");
2797 virtualdmabug_workaround();
2802 * Round-robin between our available drives, doing one request from each
2804 static int set_next_request(void)
2806 struct request_queue *q;
2807 int old_pos = fdc_queue;
2810 q = disks[fdc_queue]->queue;
2811 if (++fdc_queue == N_DRIVE)
2814 current_req = blk_fetch_request(q);
2816 current_req->error_count = 0;
2820 } while (fdc_queue != old_pos);
2822 return current_req != NULL;
2825 static void redo_fd_request(void)
2831 if (current_drive < N_DRIVE)
2832 floppy_off(current_drive);
2838 spin_lock_irq(&floppy_lock);
2839 pending = set_next_request();
2840 spin_unlock_irq(&floppy_lock);
2847 drive = (long)current_req->rq_disk->private_data;
2849 reschedule_timeout(current_reqD, "redo fd request");
2852 raw_cmd = &default_raw_cmd;
2854 if (start_motor(redo_fd_request))
2857 disk_change(current_drive);
2858 if (test_bit(current_drive, &fake_change) ||
2859 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2860 DPRINT("disk absent or changed during operation\n");
2864 if (!_floppy) { /* Autodetection */
2866 DRS->probed_format = 0;
2867 if (next_valid_format()) {
2868 DPRINT("no autodetectable formats\n");
2875 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2878 errors = &(current_req->error_count);
2879 tmp = make_raw_rw_request();
2885 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2887 schedule_bh(floppy_start);
2888 debugt(__func__, "queue fd request");
2892 static const struct cont_t rw_cont = {
2893 .interrupt = rw_interrupt,
2894 .redo = redo_fd_request,
2895 .error = bad_flp_intr,
2896 .done = request_done
2899 static void process_fd_request(void)
2902 schedule_bh(redo_fd_request);
2905 static void do_fd_request(struct request_queue *q)
2907 if (WARN(max_buffer_sectors == 0,
2908 "VFS: %s called on non-open device\n", __func__))
2911 if (WARN(atomic_read(&usage_count) == 0,
2912 "warning: usage count=0, current_req=%p sect=%ld flags=%llx\n",
2913 current_req, (long)blk_rq_pos(current_req),
2914 (unsigned long long) current_req->cmd_flags))
2917 if (test_and_set_bit(0, &fdc_busy)) {
2918 /* fdc busy, this new request will be treated when the
2919 current one is done */
2920 is_alive(__func__, "old request running");
2923 command_status = FD_COMMAND_NONE;
2924 __reschedule_timeout(MAXTIMEOUT, "fd_request");
2926 process_fd_request();
2927 is_alive(__func__, "");
2930 static const struct cont_t poll_cont = {
2931 .interrupt = success_and_wakeup,
2932 .redo = floppy_ready,
2933 .error = generic_failure,
2934 .done = generic_done
2937 static int poll_drive(bool interruptible, int flag)
2939 /* no auto-sense, just clear dcl */
2940 raw_cmd = &default_raw_cmd;
2941 raw_cmd->flags = flag;
2943 raw_cmd->cmd_count = 0;
2945 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2946 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2948 return wait_til_done(floppy_ready, interruptible);
2952 * User triggered reset
2953 * ====================
2956 static void reset_intr(void)
2958 pr_info("weird, reset interrupt called\n");
2961 static const struct cont_t reset_cont = {
2962 .interrupt = reset_intr,
2963 .redo = success_and_wakeup,
2964 .error = generic_failure,
2965 .done = generic_done
2968 static int user_reset_fdc(int drive, int arg, bool interruptible)
2972 if (lock_fdc(drive))
2975 if (arg == FD_RESET_ALWAYS)
2979 ret = wait_til_done(reset_fdc, interruptible);
2983 process_fd_request();
2988 * Misc Ioctl's and support
2989 * ========================
2991 static inline int fd_copyout(void __user *param, const void *address,
2994 return copy_to_user(param, address, size) ? -EFAULT : 0;
2997 static inline int fd_copyin(void __user *param, void *address,
3000 return copy_from_user(address, param, size) ? -EFAULT : 0;
3003 static const char *drive_name(int type, int drive)
3005 struct floppy_struct *floppy;
3008 floppy = floppy_type + type;
3010 if (UDP->native_format)
3011 floppy = floppy_type + UDP->native_format;
3016 return floppy->name;
3022 static void raw_cmd_done(int flag)
3027 raw_cmd->flags |= FD_RAW_FAILURE;
3028 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3030 raw_cmd->reply_count = inr;
3031 if (raw_cmd->reply_count > MAX_REPLIES)
3032 raw_cmd->reply_count = 0;
3033 for (i = 0; i < raw_cmd->reply_count; i++)
3034 raw_cmd->reply[i] = reply_buffer[i];
3036 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3037 unsigned long flags;
3038 flags = claim_dma_lock();
3039 raw_cmd->length = fd_get_dma_residue();
3040 release_dma_lock(flags);
3043 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3044 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3045 raw_cmd->flags |= FD_RAW_FAILURE;
3047 if (disk_change(current_drive))
3048 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3050 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3051 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3052 motor_off_callback(current_drive);
3054 if (raw_cmd->next &&
3055 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3056 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3057 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3058 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3059 raw_cmd = raw_cmd->next;
3066 static const struct cont_t raw_cmd_cont = {
3067 .interrupt = success_and_wakeup,
3068 .redo = floppy_start,
3069 .error = generic_failure,
3070 .done = raw_cmd_done
3073 static int raw_cmd_copyout(int cmd, void __user *param,
3074 struct floppy_raw_cmd *ptr)
3079 struct floppy_raw_cmd cmd = *ptr;
3081 cmd.kernel_data = NULL;
3082 ret = copy_to_user(param, &cmd, sizeof(cmd));
3085 param += sizeof(struct floppy_raw_cmd);
3086 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3087 if (ptr->length >= 0 &&
3088 ptr->length <= ptr->buffer_length) {
3089 long length = ptr->buffer_length - ptr->length;
3090 ret = fd_copyout(ptr->data, ptr->kernel_data,
3102 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3104 struct floppy_raw_cmd *next;
3105 struct floppy_raw_cmd *this;
3110 if (this->buffer_length) {
3111 fd_dma_mem_free((unsigned long)this->kernel_data,
3112 this->buffer_length);
3113 this->buffer_length = 0;
3121 static int raw_cmd_copyin(int cmd, void __user *param,
3122 struct floppy_raw_cmd **rcmd)
3124 struct floppy_raw_cmd *ptr;
3131 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_KERNEL);
3135 ret = copy_from_user(ptr, param, sizeof(*ptr));
3137 ptr->buffer_length = 0;
3138 ptr->kernel_data = NULL;
3141 param += sizeof(struct floppy_raw_cmd);
3142 if (ptr->cmd_count > 33)
3143 /* the command may now also take up the space
3144 * initially intended for the reply & the
3145 * reply count. Needed for long 82078 commands
3146 * such as RESTORE, which takes ... 17 command
3147 * bytes. Murphy's law #137: When you reserve
3148 * 16 bytes for a structure, you'll one day
3149 * discover that you really need 17...
3153 for (i = 0; i < 16; i++)
3155 ptr->resultcode = 0;
3157 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3158 if (ptr->length <= 0)
3160 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3161 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3162 if (!ptr->kernel_data)
3164 ptr->buffer_length = ptr->length;
3166 if (ptr->flags & FD_RAW_WRITE) {
3167 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3172 if (ptr->flags & FD_RAW_MORE) {
3173 rcmd = &(ptr->next);
3181 static int raw_cmd_ioctl(int cmd, void __user *param)
3183 struct floppy_raw_cmd *my_raw_cmd;
3188 if (FDCS->rawcmd <= 1)
3190 for (drive = 0; drive < N_DRIVE; drive++) {
3191 if (FDC(drive) != fdc)
3193 if (drive == current_drive) {
3194 if (UDRS->fd_ref > 1) {
3198 } else if (UDRS->fd_ref) {
3207 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3209 raw_cmd_free(&my_raw_cmd);
3213 raw_cmd = my_raw_cmd;
3214 cont = &raw_cmd_cont;
3215 ret = wait_til_done(floppy_start, true);
3216 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3218 if (ret != -EINTR && FDCS->reset)
3221 DRS->track = NO_TRACK;
3223 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3226 raw_cmd_free(&my_raw_cmd);
3230 static int invalidate_drive(struct block_device *bdev)
3232 /* invalidate the buffer track to force a reread */
3233 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3234 process_fd_request();
3235 check_disk_change(bdev);
3239 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3240 int drive, int type, struct block_device *bdev)
3244 /* sanity checking for parameters. */
3245 if ((int)g->sect <= 0 ||
3246 (int)g->head <= 0 ||
3247 /* check for overflow in max_sector */
3248 (int)(g->sect * g->head) <= 0 ||
3249 /* check for zero in F_SECT_PER_TRACK */
3250 (unsigned char)((g->sect << 2) >> FD_SIZECODE(g)) == 0 ||
3251 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3252 /* check if reserved bits are set */
3253 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3256 if (!capable(CAP_SYS_ADMIN))
3258 mutex_lock(&open_lock);
3259 if (lock_fdc(drive)) {
3260 mutex_unlock(&open_lock);
3263 floppy_type[type] = *g;
3264 floppy_type[type].name = "user format";
3265 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3266 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3267 floppy_type[type].size + 1;
3268 process_fd_request();
3269 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3270 struct block_device *bdev = opened_bdev[cnt];
3271 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3273 __invalidate_device(bdev, true);
3275 mutex_unlock(&open_lock);
3279 if (lock_fdc(drive))
3281 if (cmd != FDDEFPRM) {
3282 /* notice a disk change immediately, else
3283 * we lose our settings immediately*/
3284 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3287 oldStretch = g->stretch;
3288 user_params[drive] = *g;
3289 if (buffer_drive == drive)
3290 SUPBOUND(buffer_max, user_params[drive].sect);
3291 current_type[drive] = &user_params[drive];
3292 floppy_sizes[drive] = user_params[drive].size;
3293 if (cmd == FDDEFPRM)
3294 DRS->keep_data = -1;
3297 /* invalidation. Invalidate only when needed, i.e.
3298 * when there are already sectors in the buffer cache
3299 * whose number will change. This is useful, because
3300 * mtools often changes the geometry of the disk after
3301 * looking at the boot block */
3302 if (DRS->maxblock > user_params[drive].sect ||
3304 ((user_params[drive].sect ^ oldStretch) &
3305 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3306 invalidate_drive(bdev);
3308 process_fd_request();
3313 /* handle obsolete ioctl's */
3314 static unsigned int ioctl_table[] = {
3342 static int normalize_ioctl(unsigned int *cmd, int *size)
3346 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3347 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3348 *size = _IOC_SIZE(*cmd);
3349 *cmd = ioctl_table[i];
3350 if (*size > _IOC_SIZE(*cmd)) {
3351 pr_info("ioctl not yet supported\n");
3360 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3363 *g = &floppy_type[type];
3365 if (lock_fdc(drive))
3367 if (poll_drive(false, 0) == -EINTR)
3369 process_fd_request();
3370 *g = current_type[drive];
3377 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3379 int drive = (long)bdev->bd_disk->private_data;
3380 int type = ITYPE(drive_state[drive].fd_device);
3381 struct floppy_struct *g;
3384 ret = get_floppy_geometry(drive, type, &g);
3388 geo->heads = g->head;
3389 geo->sectors = g->sect;
3390 geo->cylinders = g->track;
3394 static bool valid_floppy_drive_params(const short autodetect[8],
3397 size_t floppy_type_size = ARRAY_SIZE(floppy_type);
3400 for (i = 0; i < 8; ++i) {
3401 if (autodetect[i] < 0 ||
3402 autodetect[i] >= floppy_type_size)
3406 if (native_format < 0 || native_format >= floppy_type_size)
3412 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3413 unsigned long param)
3415 int drive = (long)bdev->bd_disk->private_data;
3416 int type = ITYPE(UDRS->fd_device);
3421 struct floppy_struct g; /* geometry */
3422 struct format_descr f;
3423 struct floppy_max_errors max_errors;
3424 struct floppy_drive_params dp;
3425 } inparam; /* parameters coming from user space */
3426 const void *outparam; /* parameters passed back to user space */
3428 /* convert compatibility eject ioctls into floppy eject ioctl.
3429 * We do this in order to provide a means to eject floppy disks before
3430 * installing the new fdutils package */
3431 if (cmd == CDROMEJECT || /* CD-ROM eject */
3432 cmd == 0x6470) { /* SunOS floppy eject */
3433 DPRINT("obsolete eject ioctl\n");
3434 DPRINT("please use floppycontrol --eject\n");
3438 if (!((cmd & 0xff00) == 0x0200))
3441 /* convert the old style command into a new style command */
3442 ret = normalize_ioctl(&cmd, &size);
3446 /* permission checks */
3447 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3448 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3451 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3455 memset(&inparam, 0, sizeof(inparam));
3456 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3457 ret = fd_copyin((void __user *)param, &inparam, size);
3464 if (UDRS->fd_ref != 1)
3465 /* somebody else has this drive open */
3467 if (lock_fdc(drive))
3470 /* do the actual eject. Fails on
3471 * non-Sparc architectures */
3472 ret = fd_eject(UNIT(drive));
3474 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3475 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3476 process_fd_request();
3479 if (lock_fdc(drive))
3481 current_type[drive] = NULL;
3482 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3483 UDRS->keep_data = 0;
3484 return invalidate_drive(bdev);
3487 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3489 ret = get_floppy_geometry(drive, type,
3490 (struct floppy_struct **)&outparam);
3493 memcpy(&inparam.g, outparam,
3494 offsetof(struct floppy_struct, name));
3495 outparam = &inparam.g;
3498 UDP->flags |= FTD_MSG;
3501 UDP->flags &= ~FTD_MSG;
3504 if (lock_fdc(drive))
3506 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3509 process_fd_request();
3510 if (ret & FD_VERIFY)
3512 if (!(ret & FD_DISK_WRITABLE))
3516 if (UDRS->fd_ref != 1)
3518 return do_format(drive, &inparam.f);
3521 if (lock_fdc(drive))
3523 return invalidate_drive(bdev);
3524 case FDSETEMSGTRESH:
3525 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3528 outparam = &UDP->max_errors;
3531 UDP->max_errors = inparam.max_errors;
3534 outparam = drive_name(type, drive);
3535 SUPBOUND(size, strlen((const char *)outparam) + 1);
3538 if (!valid_floppy_drive_params(inparam.dp.autodetect,
3539 inparam.dp.native_format))
3547 if (lock_fdc(drive))
3549 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3551 process_fd_request();
3557 return user_reset_fdc(drive, (int)param, true);
3562 memset(UDRWE, 0, sizeof(*UDRWE));
3570 if (lock_fdc(drive))
3573 i = raw_cmd_ioctl(cmd, (void __user *)param);
3576 process_fd_request();
3579 if (lock_fdc(drive))
3582 process_fd_request();
3588 if (_IOC_DIR(cmd) & _IOC_READ)
3589 return fd_copyout((void __user *)param, outparam, size);
3594 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3595 unsigned int cmd, unsigned long param)
3599 mutex_lock(&floppy_mutex);
3600 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3601 mutex_unlock(&floppy_mutex);
3606 #ifdef CONFIG_COMPAT
3608 struct compat_floppy_drive_params {
3610 compat_ulong_t max_dtr;
3614 compat_ulong_t spinup;
3615 compat_ulong_t spindown;
3616 unsigned char spindown_offset;
3617 unsigned char select_delay;
3619 unsigned char tracks;
3620 compat_ulong_t timeout;
3621 unsigned char interleave_sect;
3622 struct floppy_max_errors max_errors;
3625 short autodetect[8];
3626 compat_int_t checkfreq;
3627 compat_int_t native_format;
3630 struct compat_floppy_drive_struct {
3632 compat_ulong_t spinup_date;
3633 compat_ulong_t select_date;
3634 compat_ulong_t first_read_date;
3635 short probed_format;
3639 compat_int_t generation;
3640 compat_int_t keep_data;
3641 compat_int_t fd_ref;
3642 compat_int_t fd_device;
3643 compat_int_t last_checked;
3644 compat_caddr_t dmabuf;
3645 compat_int_t bufblocks;
3648 struct compat_floppy_fdc_state {
3652 unsigned char version;
3654 compat_ulong_t address;
3655 unsigned int rawcmd:2;
3656 unsigned int reset:1;
3657 unsigned int need_configure:1;
3658 unsigned int perp_mode:2;
3659 unsigned int has_fifo:1;
3660 unsigned int driver_version;
3661 unsigned char track[4];
3664 struct compat_floppy_write_errors {
3665 unsigned int write_errors;
3666 compat_ulong_t first_error_sector;
3667 compat_int_t first_error_generation;
3668 compat_ulong_t last_error_sector;
3669 compat_int_t last_error_generation;
3670 compat_uint_t badness;
3673 #define FDSETPRM32 _IOW(2, 0x42, struct compat_floppy_struct)
3674 #define FDDEFPRM32 _IOW(2, 0x43, struct compat_floppy_struct)
3675 #define FDSETDRVPRM32 _IOW(2, 0x90, struct compat_floppy_drive_params)
3676 #define FDGETDRVPRM32 _IOR(2, 0x11, struct compat_floppy_drive_params)
3677 #define FDGETDRVSTAT32 _IOR(2, 0x12, struct compat_floppy_drive_struct)
3678 #define FDPOLLDRVSTAT32 _IOR(2, 0x13, struct compat_floppy_drive_struct)
3679 #define FDGETFDCSTAT32 _IOR(2, 0x15, struct compat_floppy_fdc_state)
3680 #define FDWERRORGET32 _IOR(2, 0x17, struct compat_floppy_write_errors)
3682 static int compat_set_geometry(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3683 struct compat_floppy_struct __user *arg)
3685 struct floppy_struct v;
3689 BUILD_BUG_ON(offsetof(struct floppy_struct, name) !=
3690 offsetof(struct compat_floppy_struct, name));
3692 if (!(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL)))
3695 memset(&v, 0, sizeof(struct floppy_struct));
3696 if (copy_from_user(&v, arg, offsetof(struct floppy_struct, name)))
3699 mutex_lock(&floppy_mutex);
3700 drive = (long)bdev->bd_disk->private_data;
3701 type = ITYPE(UDRS->fd_device);
3702 err = set_geometry(cmd == FDSETPRM32 ? FDSETPRM : FDDEFPRM,
3703 &v, drive, type, bdev);
3704 mutex_unlock(&floppy_mutex);
3708 static int compat_get_prm(int drive,
3709 struct compat_floppy_struct __user *arg)
3711 struct compat_floppy_struct v;
3712 struct floppy_struct *p;
3715 memset(&v, 0, sizeof(v));
3716 mutex_lock(&floppy_mutex);
3717 err = get_floppy_geometry(drive, ITYPE(UDRS->fd_device), &p);
3719 mutex_unlock(&floppy_mutex);
3722 memcpy(&v, p, offsetof(struct floppy_struct, name));
3723 mutex_unlock(&floppy_mutex);
3724 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_struct)))
3729 static int compat_setdrvprm(int drive,
3730 struct compat_floppy_drive_params __user *arg)
3732 struct compat_floppy_drive_params v;
3734 if (!capable(CAP_SYS_ADMIN))
3736 if (copy_from_user(&v, arg, sizeof(struct compat_floppy_drive_params)))
3738 if (!valid_floppy_drive_params(v.autodetect, v.native_format))
3740 mutex_lock(&floppy_mutex);
3742 UDP->max_dtr = v.max_dtr;
3746 UDP->spinup = v.spinup;
3747 UDP->spindown = v.spindown;
3748 UDP->spindown_offset = v.spindown_offset;
3749 UDP->select_delay = v.select_delay;
3751 UDP->tracks = v.tracks;
3752 UDP->timeout = v.timeout;
3753 UDP->interleave_sect = v.interleave_sect;
3754 UDP->max_errors = v.max_errors;
3755 UDP->flags = v.flags;
3756 UDP->read_track = v.read_track;
3757 memcpy(UDP->autodetect, v.autodetect, sizeof(v.autodetect));
3758 UDP->checkfreq = v.checkfreq;
3759 UDP->native_format = v.native_format;
3760 mutex_unlock(&floppy_mutex);
3764 static int compat_getdrvprm(int drive,
3765 struct compat_floppy_drive_params __user *arg)
3767 struct compat_floppy_drive_params v;
3769 memset(&v, 0, sizeof(struct compat_floppy_drive_params));
3770 mutex_lock(&floppy_mutex);
3772 v.max_dtr = UDP->max_dtr;
3776 v.spinup = UDP->spinup;
3777 v.spindown = UDP->spindown;
3778 v.spindown_offset = UDP->spindown_offset;
3779 v.select_delay = UDP->select_delay;
3781 v.tracks = UDP->tracks;
3782 v.timeout = UDP->timeout;
3783 v.interleave_sect = UDP->interleave_sect;
3784 v.max_errors = UDP->max_errors;
3785 v.flags = UDP->flags;
3786 v.read_track = UDP->read_track;
3787 memcpy(v.autodetect, UDP->autodetect, sizeof(v.autodetect));
3788 v.checkfreq = UDP->checkfreq;
3789 v.native_format = UDP->native_format;
3790 mutex_unlock(&floppy_mutex);
3792 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_params)))
3797 static int compat_getdrvstat(int drive, bool poll,
3798 struct compat_floppy_drive_struct __user *arg)
3800 struct compat_floppy_drive_struct v;
3802 memset(&v, 0, sizeof(struct compat_floppy_drive_struct));
3803 mutex_lock(&floppy_mutex);
3806 if (lock_fdc(drive))
3808 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3810 process_fd_request();
3812 v.spinup_date = UDRS->spinup_date;
3813 v.select_date = UDRS->select_date;
3814 v.first_read_date = UDRS->first_read_date;
3815 v.probed_format = UDRS->probed_format;
3816 v.track = UDRS->track;
3817 v.maxblock = UDRS->maxblock;
3818 v.maxtrack = UDRS->maxtrack;
3819 v.generation = UDRS->generation;
3820 v.keep_data = UDRS->keep_data;
3821 v.fd_ref = UDRS->fd_ref;
3822 v.fd_device = UDRS->fd_device;
3823 v.last_checked = UDRS->last_checked;
3824 v.dmabuf = (uintptr_t)UDRS->dmabuf;
3825 v.bufblocks = UDRS->bufblocks;
3826 mutex_unlock(&floppy_mutex);
3828 if (copy_to_user(arg, &v, sizeof(struct compat_floppy_drive_struct)))
3832 mutex_unlock(&floppy_mutex);
3836 static int compat_getfdcstat(int drive,
3837 struct compat_floppy_fdc_state __user *arg)
3839 struct compat_floppy_fdc_state v32;
3840 struct floppy_fdc_state v;
3842 mutex_lock(&floppy_mutex);
3844 mutex_unlock(&floppy_mutex);
3846 memset(&v32, 0, sizeof(struct compat_floppy_fdc_state));
3847 v32.spec1 = v.spec1;
3848 v32.spec2 = v.spec2;
3850 v32.version = v.version;
3852 v32.address = v.address;
3853 v32.rawcmd = v.rawcmd;
3854 v32.reset = v.reset;
3855 v32.need_configure = v.need_configure;
3856 v32.perp_mode = v.perp_mode;
3857 v32.has_fifo = v.has_fifo;
3858 v32.driver_version = v.driver_version;
3859 memcpy(v32.track, v.track, 4);
3860 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_fdc_state)))
3865 static int compat_werrorget(int drive,
3866 struct compat_floppy_write_errors __user *arg)
3868 struct compat_floppy_write_errors v32;
3869 struct floppy_write_errors v;
3871 memset(&v32, 0, sizeof(struct compat_floppy_write_errors));
3872 mutex_lock(&floppy_mutex);
3874 mutex_unlock(&floppy_mutex);
3875 v32.write_errors = v.write_errors;
3876 v32.first_error_sector = v.first_error_sector;
3877 v32.first_error_generation = v.first_error_generation;
3878 v32.last_error_sector = v.last_error_sector;
3879 v32.last_error_generation = v.last_error_generation;
3880 v32.badness = v.badness;
3881 if (copy_to_user(arg, &v32, sizeof(struct compat_floppy_write_errors)))
3886 static int fd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3887 unsigned long param)
3889 int drive = (long)bdev->bd_disk->private_data;
3893 case FDSETEMSGTRESH:
3901 return fd_ioctl(bdev, mode, cmd, param);
3908 return fd_ioctl(bdev, mode, cmd,
3909 (unsigned long)compat_ptr(param));
3912 return compat_set_geometry(bdev, mode, cmd, compat_ptr(param));
3914 return compat_get_prm(drive, compat_ptr(param));
3916 return compat_setdrvprm(drive, compat_ptr(param));
3918 return compat_getdrvprm(drive, compat_ptr(param));
3919 case FDPOLLDRVSTAT32:
3920 return compat_getdrvstat(drive, true, compat_ptr(param));
3921 case FDGETDRVSTAT32:
3922 return compat_getdrvstat(drive, false, compat_ptr(param));
3923 case FDGETFDCSTAT32:
3924 return compat_getfdcstat(drive, compat_ptr(param));
3926 return compat_werrorget(drive, compat_ptr(param));
3932 static void __init config_types(void)
3934 bool has_drive = false;
3937 /* read drive info out of physical CMOS */
3940 UDP->cmos = FLOPPY0_TYPE;
3942 if (!UDP->cmos && FLOPPY1_TYPE)
3943 UDP->cmos = FLOPPY1_TYPE;
3945 /* FIXME: additional physical CMOS drive detection should go here */
3947 for (drive = 0; drive < N_DRIVE; drive++) {
3948 unsigned int type = UDP->cmos;
3949 struct floppy_drive_params *params;
3950 const char *name = NULL;
3953 if (type < ARRAY_SIZE(default_drive_params)) {
3954 params = &default_drive_params[type].params;
3956 name = default_drive_params[type].name;
3957 allowed_drive_mask |= 1 << drive;
3959 allowed_drive_mask &= ~(1 << drive);
3961 params = &default_drive_params[0].params;
3962 snprintf(temparea, sizeof(temparea),
3963 "unknown type %d (usb?)", type);
3967 const char *prepend;
3971 pr_info("Floppy drive(s):");
3976 pr_cont("%s fd%d is %s", prepend, drive, name);
3985 static void floppy_release(struct gendisk *disk, fmode_t mode)
3987 int drive = (long)disk->private_data;
3989 mutex_lock(&floppy_mutex);
3990 mutex_lock(&open_lock);
3991 if (!UDRS->fd_ref--) {
3992 DPRINT("floppy_release with fd_ref == 0");
3996 opened_bdev[drive] = NULL;
3997 mutex_unlock(&open_lock);
3998 mutex_unlock(&floppy_mutex);
4002 * floppy_open check for aliasing (/dev/fd0 can be the same as
4003 * /dev/PS0 etc), and disallows simultaneous access to the same
4004 * drive with different device numbers.
4006 static int floppy_open(struct block_device *bdev, fmode_t mode)
4008 int drive = (long)bdev->bd_disk->private_data;
4009 int old_dev, new_dev;
4014 mutex_lock(&floppy_mutex);
4015 mutex_lock(&open_lock);
4016 old_dev = UDRS->fd_device;
4017 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
4020 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
4021 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4022 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4027 opened_bdev[drive] = bdev;
4031 if (!floppy_track_buffer) {
4032 /* if opening an ED drive, reserve a big buffer,
4033 * else reserve a small one */
4034 if ((UDP->cmos == 6) || (UDP->cmos == 5))
4035 try = 64; /* Only 48 actually useful */
4037 try = 32; /* Only 24 actually useful */
4039 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4040 if (!tmp && !floppy_track_buffer) {
4041 try >>= 1; /* buffer only one side */
4043 tmp = (char *)fd_dma_mem_alloc(1024 * try);
4045 if (!tmp && !floppy_track_buffer)
4046 fallback_on_nodma_alloc(&tmp, 2048 * try);
4047 if (!tmp && !floppy_track_buffer) {
4048 DPRINT("Unable to allocate DMA memory\n");
4051 if (floppy_track_buffer) {
4053 fd_dma_mem_free((unsigned long)tmp, try * 1024);
4055 buffer_min = buffer_max = -1;
4056 floppy_track_buffer = tmp;
4057 max_buffer_sectors = try;
4061 new_dev = MINOR(bdev->bd_dev);
4062 UDRS->fd_device = new_dev;
4063 set_capacity(disks[drive], floppy_sizes[new_dev]);
4064 if (old_dev != -1 && old_dev != new_dev) {
4065 if (buffer_drive == drive)
4069 if (UFDCS->rawcmd == 1)
4072 if (!(mode & FMODE_NDELAY)) {
4073 if (mode & (FMODE_READ|FMODE_WRITE)) {
4074 UDRS->last_checked = 0;
4075 clear_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
4076 check_disk_change(bdev);
4077 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
4079 if (test_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags))
4083 if ((mode & FMODE_WRITE) &&
4084 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
4087 mutex_unlock(&open_lock);
4088 mutex_unlock(&floppy_mutex);
4094 opened_bdev[drive] = NULL;
4096 mutex_unlock(&open_lock);
4097 mutex_unlock(&floppy_mutex);
4102 * Check if the disk has been changed or if a change has been faked.
4104 static unsigned int floppy_check_events(struct gendisk *disk,
4105 unsigned int clearing)
4107 int drive = (long)disk->private_data;
4109 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4110 test_bit(FD_VERIFY_BIT, &UDRS->flags))
4111 return DISK_EVENT_MEDIA_CHANGE;
4113 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
4114 if (lock_fdc(drive))
4116 poll_drive(false, 0);
4117 process_fd_request();
4120 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4121 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
4122 test_bit(drive, &fake_change) ||
4123 drive_no_geom(drive))
4124 return DISK_EVENT_MEDIA_CHANGE;
4129 * This implements "read block 0" for floppy_revalidate().
4130 * Needed for format autodetection, checking whether there is
4131 * a disk in the drive, and whether that disk is writable.
4136 struct completion complete;
4139 static void floppy_rb0_cb(struct bio *bio)
4141 struct rb0_cbdata *cbdata = (struct rb0_cbdata *)bio->bi_private;
4142 int drive = cbdata->drive;
4144 if (bio->bi_status) {
4145 pr_info("floppy: error %d while reading block 0\n",
4147 set_bit(FD_OPEN_SHOULD_FAIL_BIT, &UDRS->flags);
4149 complete(&cbdata->complete);
4152 static int __floppy_read_block_0(struct block_device *bdev, int drive)
4155 struct bio_vec bio_vec;
4157 struct rb0_cbdata cbdata;
4160 page = alloc_page(GFP_NOIO);
4162 process_fd_request();
4166 size = bdev->bd_block_size;
4170 cbdata.drive = drive;
4172 bio_init(&bio, &bio_vec, 1);
4173 bio_set_dev(&bio, bdev);
4174 bio_add_page(&bio, page, size, 0);
4176 bio.bi_iter.bi_sector = 0;
4177 bio.bi_flags |= (1 << BIO_QUIET);
4178 bio.bi_private = &cbdata;
4179 bio.bi_end_io = floppy_rb0_cb;
4180 bio_set_op_attrs(&bio, REQ_OP_READ, 0);
4182 init_completion(&cbdata.complete);
4185 process_fd_request();
4187 wait_for_completion(&cbdata.complete);
4194 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
4195 * the bootblock (block 0). "Autodetection" is also needed to check whether
4196 * there is a disk in the drive at all... Thus we also do it for fixed
4197 * geometry formats */
4198 static int floppy_revalidate(struct gendisk *disk)
4200 int drive = (long)disk->private_data;
4204 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4205 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
4206 test_bit(drive, &fake_change) ||
4207 drive_no_geom(drive)) {
4208 if (WARN(atomic_read(&usage_count) == 0,
4209 "VFS: revalidate called on non-open device.\n"))
4212 res = lock_fdc(drive);
4215 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
4216 test_bit(FD_VERIFY_BIT, &UDRS->flags));
4217 if (!(cf || test_bit(drive, &fake_change) || drive_no_geom(drive))) {
4218 process_fd_request(); /*already done by another thread */
4223 if (buffer_drive == drive)
4225 clear_bit(drive, &fake_change);
4226 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4229 if (drive_no_geom(drive)) {
4231 res = __floppy_read_block_0(opened_bdev[drive], drive);
4234 poll_drive(false, FD_RAW_NEED_DISK);
4235 process_fd_request();
4238 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
4242 static const struct block_device_operations floppy_fops = {
4243 .owner = THIS_MODULE,
4244 .open = floppy_open,
4245 .release = floppy_release,
4247 .getgeo = fd_getgeo,
4248 .check_events = floppy_check_events,
4249 .revalidate_disk = floppy_revalidate,
4250 #ifdef CONFIG_COMPAT
4251 .compat_ioctl = fd_compat_ioctl,
4256 * Floppy Driver initialization
4257 * =============================
4260 /* Determine the floppy disk controller type */
4261 /* This routine was written by David C. Niemi */
4262 static char __init get_fdc_version(void)
4266 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
4271 return FDC_NONE; /* No FDC present ??? */
4272 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4273 pr_info("FDC %d is an 8272A\n", fdc);
4274 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
4277 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
4282 if (!fdc_configure()) {
4283 pr_info("FDC %d is an 82072\n", fdc);
4284 return FDC_82072; /* 82072 doesn't know CONFIGURE */
4287 output_byte(FD_PERPENDICULAR);
4288 if (need_more_output() == MORE_OUTPUT) {
4291 pr_info("FDC %d is an 82072A\n", fdc);
4292 return FDC_82072A; /* 82072A as found on Sparcs. */
4295 output_byte(FD_UNLOCK);
4297 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4298 pr_info("FDC %d is a pre-1991 82077\n", fdc);
4299 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
4302 if ((r != 1) || (reply_buffer[0] != 0x00)) {
4303 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
4307 output_byte(FD_PARTID);
4310 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
4314 if (reply_buffer[0] == 0x80) {
4315 pr_info("FDC %d is a post-1991 82077\n", fdc);
4316 return FDC_82077; /* Revised 82077AA passes all the tests */
4318 switch (reply_buffer[0] >> 5) {
4320 /* Either a 82078-1 or a 82078SL running at 5Volt */
4321 pr_info("FDC %d is an 82078.\n", fdc);
4324 pr_info("FDC %d is a 44pin 82078\n", fdc);
4327 pr_info("FDC %d is a S82078B\n", fdc);
4330 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
4333 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4334 fdc, reply_buffer[0] >> 5);
4335 return FDC_82078_UNKN;
4337 } /* get_fdc_version */
4339 /* lilo configuration */
4341 static void __init floppy_set_flags(int *ints, int param, int param2)
4345 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4347 default_drive_params[i].params.flags |= param2;
4349 default_drive_params[i].params.flags &= ~param2;
4351 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4354 static void __init daring(int *ints, int param, int param2)
4358 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4360 default_drive_params[i].params.select_delay = 0;
4361 default_drive_params[i].params.flags |=
4362 FD_SILENT_DCL_CLEAR;
4364 default_drive_params[i].params.select_delay =
4366 default_drive_params[i].params.flags &=
4367 ~FD_SILENT_DCL_CLEAR;
4370 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4373 static void __init set_cmos(int *ints, int dummy, int dummy2)
4375 int current_drive = 0;
4378 DPRINT("wrong number of parameters for CMOS\n");
4381 current_drive = ints[1];
4382 if (current_drive < 0 || current_drive >= 8) {
4383 DPRINT("bad drive for set_cmos\n");
4387 if (current_drive >= 4 && !FDC2)
4391 DPRINT("setting CMOS code to %d\n", ints[2]);
4394 static struct param_table {
4396 void (*fn) (int *ints, int param, int param2);
4400 } config_params[] __initdata = {
4401 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4402 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4403 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4404 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4405 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4406 {"daring", daring, NULL, 1, 0},
4408 {"two_fdc", NULL, &FDC2, 0x370, 0},
4409 {"one_fdc", NULL, &FDC2, 0, 0},
4411 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4412 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4413 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4414 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4415 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4416 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4417 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4418 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4419 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4420 {"nofifo", NULL, &no_fifo, 0x20, 0},
4421 {"usefifo", NULL, &no_fifo, 0, 0},
4422 {"cmos", set_cmos, NULL, 0, 0},
4423 {"slow", NULL, &slow_floppy, 1, 0},
4424 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4425 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4426 {"L40SX", NULL, &print_unex, 0, 0}
4431 static int __init floppy_setup(char *str)
4437 str = get_options(str, ARRAY_SIZE(ints), ints);
4439 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4440 if (strcmp(str, config_params[i].name) == 0) {
4444 param = config_params[i].def_param;
4445 if (config_params[i].fn)
4446 config_params[i].fn(ints, param,
4449 if (config_params[i].var) {
4450 DPRINT("%s=%d\n", str, param);
4451 *config_params[i].var = param;
4458 DPRINT("unknown floppy option [%s]\n", str);
4460 DPRINT("allowed options are:");
4461 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4462 pr_cont(" %s", config_params[i].name);
4465 DPRINT("botched floppy option\n");
4466 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4470 static int have_no_fdc = -ENODEV;
4472 static ssize_t floppy_cmos_show(struct device *dev,
4473 struct device_attribute *attr, char *buf)
4475 struct platform_device *p = to_platform_device(dev);
4479 return sprintf(buf, "%X\n", UDP->cmos);
4482 static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4484 static struct attribute *floppy_dev_attrs[] = {
4485 &dev_attr_cmos.attr,
4489 ATTRIBUTE_GROUPS(floppy_dev);
4491 static void floppy_device_release(struct device *dev)
4495 static int floppy_resume(struct device *dev)
4499 for (fdc = 0; fdc < N_FDC; fdc++)
4500 if (FDCS->address != -1)
4501 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4506 static const struct dev_pm_ops floppy_pm_ops = {
4507 .resume = floppy_resume,
4508 .restore = floppy_resume,
4511 static struct platform_driver floppy_driver = {
4514 .pm = &floppy_pm_ops,
4518 static struct platform_device floppy_device[N_DRIVE];
4520 static bool floppy_available(int drive)
4522 if (!(allowed_drive_mask & (1 << drive)))
4524 if (fdc_state[FDC(drive)].version == FDC_NONE)
4529 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4531 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4532 if (drive >= N_DRIVE || !floppy_available(drive))
4534 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4537 return get_disk(disks[drive]);
4540 static int __init do_floppy_init(void)
4542 int i, unit, drive, err;
4545 interruptjiffies = resultjiffies = jiffies;
4547 #if defined(CONFIG_PPC)
4548 if (check_legacy_ioport(FDC1))
4554 floppy_wq = alloc_ordered_workqueue("floppy", 0);
4558 for (drive = 0; drive < N_DRIVE; drive++) {
4559 disks[drive] = alloc_disk(1);
4560 if (!disks[drive]) {
4565 disks[drive]->queue = blk_init_queue(do_fd_request, &floppy_lock);
4566 if (!disks[drive]->queue) {
4571 blk_queue_bounce_limit(disks[drive]->queue, BLK_BOUNCE_HIGH);
4572 blk_queue_max_hw_sectors(disks[drive]->queue, 64);
4573 disks[drive]->major = FLOPPY_MAJOR;
4574 disks[drive]->first_minor = TOMINOR(drive);
4575 disks[drive]->fops = &floppy_fops;
4576 sprintf(disks[drive]->disk_name, "fd%d", drive);
4578 setup_timer(&motor_off_timer[drive], motor_off_callback, drive);
4581 err = register_blkdev(FLOPPY_MAJOR, "fd");
4585 err = platform_driver_register(&floppy_driver);
4587 goto out_unreg_blkdev;
4589 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4590 floppy_find, NULL, NULL);
4592 for (i = 0; i < 256; i++)
4594 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4596 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4598 reschedule_timeout(MAXTIMEOUT, "floppy init");
4601 for (i = 0; i < N_FDC; i++) {
4603 memset(FDCS, 0, sizeof(*FDCS));
4606 #if defined(__sparc__) || defined(__mc68000__)
4607 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4611 FDCS->version = FDC_82072A;
4615 use_virtual_dma = can_use_virtual_dma & 1;
4616 fdc_state[0].address = FDC1;
4617 if (fdc_state[0].address == -1) {
4618 cancel_delayed_work(&fd_timeout);
4620 goto out_unreg_region;
4623 fdc_state[1].address = FDC2;
4626 fdc = 0; /* reset fdc in case of unexpected interrupt */
4627 err = floppy_grab_irq_and_dma();
4629 cancel_delayed_work(&fd_timeout);
4631 goto out_unreg_region;
4634 /* initialise drive state */
4635 for (drive = 0; drive < N_DRIVE; drive++) {
4636 memset(UDRS, 0, sizeof(*UDRS));
4637 memset(UDRWE, 0, sizeof(*UDRWE));
4638 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4639 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4640 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4641 UDRS->fd_device = -1;
4642 floppy_track_buffer = NULL;
4643 max_buffer_sectors = 0;
4646 * Small 10 msec delay to let through any interrupt that
4647 * initialization might have triggered, to not
4648 * confuse detection:
4652 for (i = 0; i < N_FDC; i++) {
4654 FDCS->driver_version = FD_DRIVER_VERSION;
4655 for (unit = 0; unit < 4; unit++)
4656 FDCS->track[unit] = 0;
4657 if (FDCS->address == -1)
4660 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4661 /* free ioports reserved by floppy_grab_irq_and_dma() */
4662 floppy_release_regions(fdc);
4664 FDCS->version = FDC_NONE;
4667 /* Try to determine the floppy controller type */
4668 FDCS->version = get_fdc_version();
4669 if (FDCS->version == FDC_NONE) {
4670 /* free ioports reserved by floppy_grab_irq_and_dma() */
4671 floppy_release_regions(fdc);
4675 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4676 can_use_virtual_dma = 0;
4679 /* Not all FDCs seem to be able to handle the version command
4680 * properly, so force a reset for the standard FDC clones,
4681 * to avoid interrupt garbage.
4683 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4686 cancel_delayed_work(&fd_timeout);
4690 DPRINT("no floppy controllers found\n");
4692 goto out_release_dma;
4695 for (drive = 0; drive < N_DRIVE; drive++) {
4696 if (!floppy_available(drive))
4699 floppy_device[drive].name = floppy_device_name;
4700 floppy_device[drive].id = drive;
4701 floppy_device[drive].dev.release = floppy_device_release;
4702 floppy_device[drive].dev.groups = floppy_dev_groups;
4704 err = platform_device_register(&floppy_device[drive]);
4706 goto out_remove_drives;
4708 /* to be cleaned up... */
4709 disks[drive]->private_data = (void *)(long)drive;
4710 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4711 device_add_disk(&floppy_device[drive].dev, disks[drive]);
4718 if (floppy_available(drive)) {
4719 del_gendisk(disks[drive]);
4720 platform_device_unregister(&floppy_device[drive]);
4724 if (atomic_read(&usage_count))
4725 floppy_release_irq_and_dma();
4727 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4728 platform_driver_unregister(&floppy_driver);
4730 unregister_blkdev(FLOPPY_MAJOR, "fd");
4732 destroy_workqueue(floppy_wq);
4733 for (drive = 0; drive < N_DRIVE; drive++) {
4736 if (disks[drive]->queue) {
4737 del_timer_sync(&motor_off_timer[drive]);
4738 blk_cleanup_queue(disks[drive]->queue);
4739 disks[drive]->queue = NULL;
4741 put_disk(disks[drive]);
4747 static __init void floppy_async_init(void *data, async_cookie_t cookie)
4753 static int __init floppy_init(void)
4756 return do_floppy_init();
4758 /* Don't hold up the bootup by the floppy initialization */
4759 async_schedule(floppy_async_init, NULL);
4764 static const struct io_region {
4769 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4771 /* address + 6 is reserved, and may be taken by IDE.
4772 * Unfortunately, Adaptec doesn't know this :-(, */
4776 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4778 while (p != io_regions) {
4780 release_region(FDCS->address + p->offset, p->size);
4784 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4786 static int floppy_request_regions(int fdc)
4788 const struct io_region *p;
4790 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4791 if (!request_region(FDCS->address + p->offset,
4792 p->size, "floppy")) {
4793 DPRINT("Floppy io-port 0x%04lx in use\n",
4794 FDCS->address + p->offset);
4795 floppy_release_allocated_regions(fdc, p);
4802 static void floppy_release_regions(int fdc)
4804 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4807 static int floppy_grab_irq_and_dma(void)
4809 if (atomic_inc_return(&usage_count) > 1)
4813 * We might have scheduled a free_irq(), wait it to
4816 flush_workqueue(floppy_wq);
4818 if (fd_request_irq()) {
4819 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4821 atomic_dec(&usage_count);
4824 if (fd_request_dma()) {
4825 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4827 if (can_use_virtual_dma & 2)
4828 use_virtual_dma = can_use_virtual_dma = 1;
4829 if (!(can_use_virtual_dma & 1)) {
4831 atomic_dec(&usage_count);
4836 for (fdc = 0; fdc < N_FDC; fdc++) {
4837 if (FDCS->address != -1) {
4838 if (floppy_request_regions(fdc))
4842 for (fdc = 0; fdc < N_FDC; fdc++) {
4843 if (FDCS->address != -1) {
4845 fd_outb(FDCS->dor, FD_DOR);
4849 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4851 for (fdc = 0; fdc < N_FDC; fdc++)
4852 if (FDCS->address != -1)
4853 fd_outb(FDCS->dor, FD_DOR);
4855 * The driver will try and free resources and relies on us
4856 * to know if they were allocated or not.
4859 irqdma_allocated = 1;
4865 floppy_release_regions(fdc);
4866 atomic_dec(&usage_count);
4870 static void floppy_release_irq_and_dma(void)
4877 unsigned long tmpaddr;
4879 if (!atomic_dec_and_test(&usage_count))
4882 if (irqdma_allocated) {
4886 irqdma_allocated = 0;
4893 if (floppy_track_buffer && max_buffer_sectors) {
4894 tmpsize = max_buffer_sectors * 1024;
4895 tmpaddr = (unsigned long)floppy_track_buffer;
4896 floppy_track_buffer = NULL;
4897 max_buffer_sectors = 0;
4898 buffer_min = buffer_max = -1;
4899 fd_dma_mem_free(tmpaddr, tmpsize);
4902 for (drive = 0; drive < N_FDC * 4; drive++)
4903 if (timer_pending(motor_off_timer + drive))
4904 pr_info("motor off timer %d still active\n", drive);
4907 if (delayed_work_pending(&fd_timeout))
4908 pr_info("floppy timer still active:%s\n", timeout_message);
4909 if (delayed_work_pending(&fd_timer))
4910 pr_info("auxiliary floppy timer still active\n");
4911 if (work_pending(&floppy_work))
4912 pr_info("work still pending\n");
4914 for (fdc = 0; fdc < N_FDC; fdc++)
4915 if (FDCS->address != -1)
4916 floppy_release_regions(fdc);
4922 static char *floppy;
4924 static void __init parse_floppy_cfg_string(char *cfg)
4930 while (*cfg && *cfg != ' ' && *cfg != '\t')
4941 static int __init floppy_module_init(void)
4944 parse_floppy_cfg_string(floppy);
4945 return floppy_init();
4947 module_init(floppy_module_init);
4949 static void __exit floppy_module_exit(void)
4953 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4954 unregister_blkdev(FLOPPY_MAJOR, "fd");
4955 platform_driver_unregister(&floppy_driver);
4957 destroy_workqueue(floppy_wq);
4959 for (drive = 0; drive < N_DRIVE; drive++) {
4960 del_timer_sync(&motor_off_timer[drive]);
4962 if (floppy_available(drive)) {
4963 del_gendisk(disks[drive]);
4964 platform_device_unregister(&floppy_device[drive]);
4966 blk_cleanup_queue(disks[drive]->queue);
4969 * These disks have not called add_disk(). Don't put down
4970 * queue reference in put_disk().
4972 if (!(allowed_drive_mask & (1 << drive)) ||
4973 fdc_state[FDC(drive)].version == FDC_NONE)
4974 disks[drive]->queue = NULL;
4976 put_disk(disks[drive]);
4979 cancel_delayed_work_sync(&fd_timeout);
4980 cancel_delayed_work_sync(&fd_timer);
4982 if (atomic_read(&usage_count))
4983 floppy_release_irq_and_dma();
4985 /* eject disk, if any */
4989 module_exit(floppy_module_exit);
4991 module_param(floppy, charp, 0);
4992 module_param(FLOPPY_IRQ, int, 0);
4993 module_param(FLOPPY_DMA, int, 0);
4994 MODULE_AUTHOR("Alain L. Knaff");
4995 MODULE_SUPPORTED_DEVICE("fd");
4996 MODULE_LICENSE("GPL");
4998 /* This doesn't actually get used other than for module information */
4999 static const struct pnp_device_id floppy_pnpids[] = {
5004 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
5008 __setup("floppy=", floppy_setup);
5009 module_init(floppy_init)
5012 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);