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/smp_lock.h>
182 #include <linux/string.h>
183 #include <linux/jiffies.h>
184 #include <linux/fcntl.h>
185 #include <linux/delay.h>
186 #include <linux/mc146818rtc.h> /* CMOS defines */
187 #include <linux/ioport.h>
188 #include <linux/interrupt.h>
189 #include <linux/init.h>
190 #include <linux/platform_device.h>
191 #include <linux/mod_devicetable.h>
192 #include <linux/buffer_head.h> /* for invalidate_buffers() */
193 #include <linux/mutex.h>
194 #include <linux/io.h>
195 #include <linux/uaccess.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 int slow_floppy;
206 #include <asm/system.h>
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 struct request_queue *floppy_queue;
262 static void do_fd_request(struct request_queue *q);
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;
418 * This struct defines the different floppy types.
420 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
421 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
422 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
423 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
424 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
425 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
426 * side 0 is on physical side 0 (but with the misnamed sector IDs).
427 * 'stretch' should probably be renamed to something more general, like
430 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
431 * The LSB (bit 2) is flipped. For most disks, the first sector
432 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
433 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
434 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
436 * Other parameters should be self-explanatory (see also setfdprm(8)).
445 | | | | | | Data rate, | 0x40 for perp
446 | | | | | | | Spec1 (stepping rate, head unload
447 | | | | | | | | /fmt gap (gap2) */
448 static struct floppy_struct floppy_type[32] = {
449 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
450 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
451 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
452 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
453 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
454 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
455 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
456 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
457 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
458 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
460 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
461 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
462 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
463 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
464 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
465 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
466 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
467 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
468 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
469 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
471 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
472 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
473 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
474 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
475 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
476 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
477 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
478 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
479 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
480 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
482 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
483 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
486 #define SECTSIZE (_FD_SECTSIZE(*floppy))
488 /* Auto-detection: Disk type used until the next media change occurs. */
489 static struct floppy_struct *current_type[N_DRIVE];
492 * User-provided type information. current_type points to
493 * the respective entry of this array.
495 static struct floppy_struct user_params[N_DRIVE];
497 static sector_t floppy_sizes[256];
499 static char floppy_device_name[] = "floppy";
502 * The driver is trying to determine the correct media format
503 * while probing is set. rw_interrupt() clears it after a
508 /* Synchronization of FDC access. */
509 #define FD_COMMAND_NONE -1
510 #define FD_COMMAND_ERROR 2
511 #define FD_COMMAND_OKAY 3
513 static volatile int command_status = FD_COMMAND_NONE;
514 static unsigned long fdc_busy;
515 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
516 static DECLARE_WAIT_QUEUE_HEAD(command_done);
518 /* Errors during formatting are counted here. */
519 static int format_errors;
521 /* Format request descriptor. */
522 static struct format_descr format_req;
525 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
526 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
527 * H is head unload time (1=16ms, 2=32ms, etc)
532 * Because these are written to by the DMA controller, they must
533 * not contain a 64k byte boundary crossing, or data will be
536 static char *floppy_track_buffer;
537 static int max_buffer_sectors;
540 typedef void (*done_f)(int);
541 static const struct cont_t {
542 void (*interrupt)(void);
543 /* this is called after the interrupt of the
545 void (*redo)(void); /* this is called to retry the operation */
546 void (*error)(void); /* this is called to tally an error */
547 done_f done; /* this is called to say if the operation has
548 * succeeded/failed */
551 static void floppy_ready(void);
552 static void floppy_start(void);
553 static void process_fd_request(void);
554 static void recalibrate_floppy(void);
555 static void floppy_shutdown(unsigned long);
557 static int floppy_request_regions(int);
558 static void floppy_release_regions(int);
559 static int floppy_grab_irq_and_dma(void);
560 static void floppy_release_irq_and_dma(void);
563 * The "reset" variable should be tested whenever an interrupt is scheduled,
564 * after the commands have been sent. This is to ensure that the driver doesn't
565 * get wedged when the interrupt doesn't come because of a failed command.
566 * reset doesn't need to be tested before sending commands, because
567 * output_byte is automatically disabled when reset is set.
569 static void reset_fdc(void);
572 * These are global variables, as that's the easiest way to give
573 * information to interrupts. They are the data used for the current
577 #define NEED_1_RECAL -2
578 #define NEED_2_RECAL -3
580 static atomic_t usage_count = ATOMIC_INIT(0);
582 /* buffer related variables */
583 static int buffer_track = -1;
584 static int buffer_drive = -1;
585 static int buffer_min = -1;
586 static int buffer_max = -1;
588 /* fdc related variables, should end up in a struct */
589 static struct floppy_fdc_state fdc_state[N_FDC];
590 static int fdc; /* current fdc */
592 static struct floppy_struct *_floppy = floppy_type;
593 static unsigned char current_drive;
594 static long current_count_sectors;
595 static unsigned char fsector_t; /* sector in track */
596 static unsigned char in_sector_offset; /* offset within physical sector,
597 * expressed in units of 512 bytes */
600 static inline int fd_eject(int drive)
611 static long unsigned debugtimer;
613 static inline void set_debugt(void)
615 debugtimer = jiffies;
618 static inline void debugt(const char *func, const char *msg)
620 if (DP->flags & DEBUGT)
621 pr_info("%s:%s dtime=%lu\n", func, msg, jiffies - debugtimer);
624 static inline void set_debugt(void) { }
625 static inline void debugt(const char *func, const char *msg) { }
628 typedef void (*timeout_fn)(unsigned long);
629 static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
631 static const char *timeout_message;
633 static void is_alive(const char *func, const char *message)
635 /* this routine checks whether the floppy driver is "alive" */
636 if (test_bit(0, &fdc_busy) && command_status < 2 &&
637 !timer_pending(&fd_timeout)) {
638 DPRINT("%s: timeout handler died. %s\n", func, message);
642 static void (*do_floppy)(void) = NULL;
646 static void (*lasthandler)(void);
647 static unsigned long interruptjiffies;
648 static unsigned long resultjiffies;
649 static int resultsize;
650 static unsigned long lastredo;
652 static struct output_log {
654 unsigned char status;
655 unsigned long jiffies;
656 } output_log[OLOGSIZE];
658 static int output_log_pos;
660 #define current_reqD -1
661 #define MAXTIMEOUT -2
663 static void __reschedule_timeout(int drive, const char *message)
665 if (drive == current_reqD)
666 drive = current_drive;
667 del_timer(&fd_timeout);
668 if (drive < 0 || drive >= N_DRIVE) {
669 fd_timeout.expires = jiffies + 20UL * HZ;
672 fd_timeout.expires = jiffies + UDP->timeout;
673 add_timer(&fd_timeout);
674 if (UDP->flags & FD_DEBUG)
675 DPRINT("reschedule timeout %s\n", message);
676 timeout_message = message;
679 static void reschedule_timeout(int drive, const char *message)
683 spin_lock_irqsave(&floppy_lock, flags);
684 __reschedule_timeout(drive, message);
685 spin_unlock_irqrestore(&floppy_lock, flags);
688 #define INFBOUND(a, b) (a) = max_t(int, a, b)
689 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
692 * Bottom half floppy driver.
693 * ==========================
695 * This part of the file contains the code talking directly to the hardware,
696 * and also the main service loop (seek-configure-spinup-command)
701 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
702 * and the last_checked date.
704 * last_checked is the date of the last check which showed 'no disk change'
705 * FD_DISK_CHANGE is set under two conditions:
706 * 1. The floppy has been changed after some i/o to that floppy already
708 * 2. No floppy disk is in the drive. This is done in order to ensure that
709 * requests are quickly flushed in case there is no disk in the drive. It
710 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
713 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
714 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
715 * each seek. If a disk is present, the disk change line should also be
716 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
717 * change line is set, this means either that no disk is in the drive, or
718 * that it has been removed since the last seek.
720 * This means that we really have a third possibility too:
721 * The floppy has been changed after the last seek.
724 static int disk_change(int drive)
726 int fdc = FDC(drive);
728 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
729 DPRINT("WARNING disk change called early\n");
730 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
731 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
732 DPRINT("probing disk change on unselected drive\n");
733 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
734 (unsigned int)FDCS->dor);
737 debug_dcl(UDP->flags,
738 "checking disk change line for drive %d\n", drive);
739 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
740 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
741 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);
743 if (UDP->flags & FD_BROKEN_DCL)
744 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
745 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
746 set_bit(FD_VERIFY_BIT, &UDRS->flags);
747 /* verify write protection */
749 if (UDRS->maxblock) /* mark it changed */
750 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
752 /* invalidate its geometry */
753 if (UDRS->keep_data >= 0) {
754 if ((UDP->flags & FTD_MSG) &&
755 current_type[drive] != NULL)
756 DPRINT("Disk type is undefined after disk change\n");
757 current_type[drive] = NULL;
758 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
763 UDRS->last_checked = jiffies;
764 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
769 static inline int is_selected(int dor, int unit)
771 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
774 static bool is_ready_state(int status)
776 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
777 return state == STATUS_READY;
780 static int set_dor(int fdc, char mask, char data)
784 unsigned char newdor;
785 unsigned char olddor;
787 if (FDCS->address == -1)
791 newdor = (olddor & mask) | data;
792 if (newdor != olddor) {
794 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
795 drive = REVDRIVE(fdc, unit);
796 debug_dcl(UDP->flags,
797 "calling disk change from set_dor\n");
801 fd_outb(newdor, FD_DOR);
804 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
805 drive = REVDRIVE(fdc, unit);
806 UDRS->select_date = jiffies;
812 static void twaddle(void)
814 if (DP->select_delay)
816 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
817 fd_outb(FDCS->dor, FD_DOR);
818 DRS->select_date = jiffies;
822 * Reset all driver information about the current fdc.
823 * This is needed after a reset, and after a raw command.
825 static void reset_fdc_info(int mode)
829 FDCS->spec1 = FDCS->spec2 = -1;
830 FDCS->need_configure = 1;
833 for (drive = 0; drive < N_DRIVE; drive++)
834 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
835 UDRS->track = NEED_2_RECAL;
838 /* selects the fdc and drive, and enables the fdc's input/dma. */
839 static void set_fdc(int drive)
841 if (drive >= 0 && drive < N_DRIVE) {
843 current_drive = drive;
845 if (fdc != 1 && fdc != 0) {
846 pr_info("bad fdc value\n");
851 set_dor(1 - fdc, ~8, 0);
853 if (FDCS->rawcmd == 2)
855 if (fd_inb(FD_STATUS) != STATUS_READY)
859 /* locks the driver */
860 static int lock_fdc(int drive, bool interruptible)
862 if (WARN(atomic_read(&usage_count) == 0,
863 "Trying to lock fdc while usage count=0\n"))
866 if (wait_event_interruptible(fdc_wait, !test_and_set_bit(0, &fdc_busy)))
869 command_status = FD_COMMAND_NONE;
871 __reschedule_timeout(drive, "lock fdc");
876 /* unlocks the driver */
877 static void unlock_fdc(void)
882 if (!test_bit(0, &fdc_busy))
883 DPRINT("FDC access conflict!\n");
886 DPRINT("device interrupt still active at FDC release: %pf!\n",
888 command_status = FD_COMMAND_NONE;
889 spin_lock_irqsave(&floppy_lock, flags);
890 del_timer(&fd_timeout);
892 clear_bit(0, &fdc_busy);
893 if (current_req || blk_peek_request(floppy_queue))
894 do_fd_request(floppy_queue);
895 spin_unlock_irqrestore(&floppy_lock, flags);
899 /* switches the motor off after a given timeout */
900 static void motor_off_callback(unsigned long nr)
902 unsigned char mask = ~(0x10 << UNIT(nr));
904 set_dor(FDC(nr), mask, 0);
907 /* schedules motor off */
908 static void floppy_off(unsigned int drive)
910 unsigned long volatile delta;
911 int fdc = FDC(drive);
913 if (!(FDCS->dor & (0x10 << UNIT(drive))))
916 del_timer(motor_off_timer + drive);
918 /* make spindle stop in a position which minimizes spinup time
921 delta = jiffies - UDRS->first_read_date + HZ -
922 UDP->spindown_offset;
923 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
924 motor_off_timer[drive].expires =
925 jiffies + UDP->spindown - delta;
927 add_timer(motor_off_timer + drive);
931 * cycle through all N_DRIVE floppy drives, for disk change testing.
932 * stopping at current drive. This is done before any long operation, to
933 * be sure to have up to date disk change information.
935 static void scandrives(void)
941 if (DP->select_delay)
944 saved_drive = current_drive;
945 for (i = 0; i < N_DRIVE; i++) {
946 drive = (saved_drive + i + 1) % N_DRIVE;
947 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
948 continue; /* skip closed drives */
950 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
951 (0x10 << UNIT(drive))))
952 /* switch the motor off again, if it was off to
954 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
956 set_fdc(saved_drive);
959 static void empty(void)
963 static DECLARE_WORK(floppy_work, NULL);
965 static void schedule_bh(void (*handler)(void))
967 PREPARE_WORK(&floppy_work, (work_func_t)handler);
968 schedule_work(&floppy_work);
971 static DEFINE_TIMER(fd_timer, NULL, 0, 0);
973 static void cancel_activity(void)
977 spin_lock_irqsave(&floppy_lock, flags);
979 PREPARE_WORK(&floppy_work, (work_func_t)empty);
980 del_timer(&fd_timer);
981 spin_unlock_irqrestore(&floppy_lock, flags);
984 /* this function makes sure that the disk stays in the drive during the
986 static void fd_watchdog(void)
988 debug_dcl(DP->flags, "calling disk change from watchdog\n");
990 if (disk_change(current_drive)) {
991 DPRINT("disk removed during i/o\n");
996 del_timer(&fd_timer);
997 fd_timer.function = (timeout_fn)fd_watchdog;
998 fd_timer.expires = jiffies + HZ / 10;
999 add_timer(&fd_timer);
1003 static void main_command_interrupt(void)
1005 del_timer(&fd_timer);
1009 /* waits for a delay (spinup or select) to pass */
1010 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1013 reset_fdc(); /* do the reset during sleep to win time
1014 * if we don't need to sleep, it's a good
1015 * occasion anyways */
1019 if (time_before(jiffies, delay)) {
1020 del_timer(&fd_timer);
1021 fd_timer.function = function;
1022 fd_timer.expires = delay;
1023 add_timer(&fd_timer);
1029 static DEFINE_SPINLOCK(floppy_hlt_lock);
1030 static int hlt_disabled;
1031 static void floppy_disable_hlt(void)
1033 unsigned long flags;
1035 spin_lock_irqsave(&floppy_hlt_lock, flags);
1036 if (!hlt_disabled) {
1038 #ifdef HAVE_DISABLE_HLT
1042 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1045 static void floppy_enable_hlt(void)
1047 unsigned long flags;
1049 spin_lock_irqsave(&floppy_hlt_lock, flags);
1052 #ifdef HAVE_DISABLE_HLT
1056 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1059 static void setup_DMA(void)
1063 if (raw_cmd->length == 0) {
1066 pr_info("zero dma transfer size:");
1067 for (i = 0; i < raw_cmd->cmd_count; i++)
1068 pr_cont("%x,", raw_cmd->cmd[i]);
1074 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1075 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1080 f = claim_dma_lock();
1083 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1084 (raw_cmd->flags & FD_RAW_READ) ?
1085 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1086 release_dma_lock(f);
1091 release_dma_lock(f);
1094 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1095 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1096 DMA_MODE_READ : DMA_MODE_WRITE);
1097 fd_set_dma_addr(raw_cmd->kernel_data);
1098 fd_set_dma_count(raw_cmd->length);
1099 virtual_dma_port = FDCS->address;
1101 release_dma_lock(f);
1103 floppy_disable_hlt();
1106 static void show_floppy(void);
1108 /* waits until the fdc becomes ready */
1109 static int wait_til_ready(void)
1116 for (counter = 0; counter < 10000; counter++) {
1117 status = fd_inb(FD_STATUS);
1118 if (status & STATUS_READY)
1122 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1129 /* sends a command byte to the fdc */
1130 static int output_byte(char byte)
1132 int status = wait_til_ready();
1137 if (is_ready_state(status)) {
1138 fd_outb(byte, FD_DATA);
1139 output_log[output_log_pos].data = byte;
1140 output_log[output_log_pos].status = status;
1141 output_log[output_log_pos].jiffies = jiffies;
1142 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1147 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1154 /* gets the response from the fdc */
1155 static int result(void)
1160 for (i = 0; i < MAX_REPLIES; i++) {
1161 status = wait_til_ready();
1164 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1165 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1166 resultjiffies = jiffies;
1170 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1171 reply_buffer[i] = fd_inb(FD_DATA);
1176 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1184 #define MORE_OUTPUT -2
1185 /* does the fdc need more output? */
1186 static int need_more_output(void)
1188 int status = wait_til_ready();
1193 if (is_ready_state(status))
1199 /* Set perpendicular mode as required, based on data rate, if supported.
1200 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1202 static void perpendicular_mode(void)
1204 unsigned char perp_mode;
1206 if (raw_cmd->rate & 0x40) {
1207 switch (raw_cmd->rate & 3) {
1215 DPRINT("Invalid data rate for perpendicular mode!\n");
1219 * convenient way to return to
1220 * redo without too much hassle
1221 * (deep stack et al.)
1228 if (FDCS->perp_mode == perp_mode)
1230 if (FDCS->version >= FDC_82077_ORIG) {
1231 output_byte(FD_PERPENDICULAR);
1232 output_byte(perp_mode);
1233 FDCS->perp_mode = perp_mode;
1234 } else if (perp_mode) {
1235 DPRINT("perpendicular mode not supported by this FDC.\n");
1237 } /* perpendicular_mode */
1239 static int fifo_depth = 0xa;
1242 static int fdc_configure(void)
1245 output_byte(FD_CONFIGURE);
1246 if (need_more_output() != MORE_OUTPUT)
1249 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1250 output_byte(0); /* pre-compensation from track
1255 #define NOMINAL_DTR 500
1257 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1258 * head load time, and DMA disable flag to values needed by floppy.
1260 * The value "dtr" is the data transfer rate in Kbps. It is needed
1261 * to account for the data rate-based scaling done by the 82072 and 82077
1262 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1265 * Note that changing the data transfer rate has a (probably deleterious)
1266 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1267 * fdc_specify is called again after each data transfer rate
1270 * srt: 1000 to 16000 in microseconds
1271 * hut: 16 to 240 milliseconds
1272 * hlt: 2 to 254 milliseconds
1274 * These values are rounded up to the next highest available delay time.
1276 static void fdc_specify(void)
1278 unsigned char spec1;
1279 unsigned char spec2;
1283 unsigned long dtr = NOMINAL_DTR;
1284 unsigned long scale_dtr = NOMINAL_DTR;
1285 int hlt_max_code = 0x7f;
1286 int hut_max_code = 0xf;
1288 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1290 FDCS->need_configure = 0;
1293 switch (raw_cmd->rate & 0x03) {
1299 if (FDCS->version >= FDC_82078) {
1300 /* chose the default rate table, not the one
1301 * where 1 = 2 Mbps */
1302 output_byte(FD_DRIVESPEC);
1303 if (need_more_output() == MORE_OUTPUT) {
1304 output_byte(UNIT(current_drive));
1314 if (FDCS->version >= FDC_82072) {
1316 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1317 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1320 /* Convert step rate from microseconds to milliseconds and 4 bits */
1321 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1328 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1331 else if (hlt > 0x7f)
1334 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1340 spec1 = (srt << 4) | hut;
1341 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1343 /* If these parameters did not change, just return with success */
1344 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1345 /* Go ahead and set spec1 and spec2 */
1346 output_byte(FD_SPECIFY);
1347 output_byte(FDCS->spec1 = spec1);
1348 output_byte(FDCS->spec2 = spec2);
1352 /* Set the FDC's data transfer rate on behalf of the specified drive.
1353 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1354 * of the specify command (i.e. using the fdc_specify function).
1356 static int fdc_dtr(void)
1358 /* If data rate not already set to desired value, set it. */
1359 if ((raw_cmd->rate & 3) == FDCS->dtr)
1363 fd_outb(raw_cmd->rate & 3, FD_DCR);
1365 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1366 * need a stabilization period of several milliseconds to be
1367 * enforced after data rate changes before R/W operations.
1368 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1370 FDCS->dtr = raw_cmd->rate & 3;
1371 return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1372 (timeout_fn)floppy_ready);
1375 static void tell_sector(void)
1377 pr_cont(": track %d, head %d, sector %d, size %d",
1378 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1381 static void print_errors(void)
1384 if (ST0 & ST0_ECE) {
1385 pr_cont("Recalibrate failed!");
1386 } else if (ST2 & ST2_CRC) {
1387 pr_cont("data CRC error");
1389 } else if (ST1 & ST1_CRC) {
1390 pr_cont("CRC error");
1392 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1395 pr_cont("sector not found");
1398 pr_cont("probe failed...");
1399 } else if (ST2 & ST2_WC) { /* seek error */
1400 pr_cont("wrong cylinder");
1401 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1402 pr_cont("bad cylinder");
1404 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1412 * OK, this error interpreting routine is called after a
1413 * DMA read/write has succeeded
1414 * or failed, so we check the results, and copy any buffers.
1415 * hhb: Added better error reporting.
1416 * ak: Made this into a separate routine.
1418 static int interpret_errors(void)
1423 DPRINT("-- FDC reply error\n");
1428 /* check IC to find cause of interrupt */
1429 switch (ST0 & ST0_INTR) {
1430 case 0x40: /* error occurred during command execution */
1432 return 0; /* occurs with pseudo-DMA */
1435 DPRINT("Drive is write protected\n");
1436 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1439 } else if (ST1 & ST1_ND) {
1440 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1441 } else if (ST1 & ST1_OR) {
1442 if (DP->flags & FTD_MSG)
1443 DPRINT("Over/Underrun - retrying\n");
1445 } else if (*errors >= DP->max_errors.reporting) {
1448 if (ST2 & ST2_WC || ST2 & ST2_BC)
1449 /* wrong cylinder => recal */
1450 DRS->track = NEED_2_RECAL;
1452 case 0x80: /* invalid command given */
1453 DPRINT("Invalid FDC command given!\n");
1457 DPRINT("Abnormal termination caused by polling\n");
1460 default: /* (0) Normal command termination */
1466 * This routine is called when everything should be correctly set up
1467 * for the transfer (i.e. floppy motor is on, the correct floppy is
1468 * selected, and the head is sitting on the right track).
1470 static void setup_rw_floppy(void)
1476 unsigned long ready_date;
1477 timeout_fn function;
1479 flags = raw_cmd->flags;
1480 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1481 flags |= FD_RAW_INTR;
1483 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1484 ready_date = DRS->spinup_date + DP->spinup;
1485 /* If spinup will take a long time, rerun scandrives
1486 * again just before spinup completion. Beware that
1487 * after scandrives, we must again wait for selection.
1489 if (time_after(ready_date, jiffies + DP->select_delay)) {
1490 ready_date -= DP->select_delay;
1491 function = (timeout_fn)floppy_start;
1493 function = (timeout_fn)setup_rw_floppy;
1495 /* wait until the floppy is spinning fast enough */
1496 if (fd_wait_for_completion(ready_date, function))
1499 dflags = DRS->flags;
1501 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1504 if (flags & FD_RAW_INTR)
1505 do_floppy = main_command_interrupt;
1508 for (i = 0; i < raw_cmd->cmd_count; i++)
1509 r |= output_byte(raw_cmd->cmd[i]);
1511 debugt(__func__, "rw_command");
1519 if (!(flags & FD_RAW_INTR)) {
1522 } else if (flags & FD_RAW_NEED_DISK)
1526 static int blind_seek;
1529 * This is the routine called after every seek (or recalibrate) interrupt
1530 * from the floppy controller.
1532 static void seek_interrupt(void)
1534 debugt(__func__, "");
1535 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1536 DPRINT("seek failed\n");
1537 DRS->track = NEED_2_RECAL;
1542 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1543 debug_dcl(DP->flags,
1544 "clearing NEWCHANGE flag because of effective seek\n");
1545 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1546 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1547 /* effective seek */
1548 DRS->select_date = jiffies;
1554 static void check_wp(void)
1556 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1557 /* check write protection */
1558 output_byte(FD_GETSTATUS);
1559 output_byte(UNIT(current_drive));
1560 if (result() != 1) {
1564 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1565 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1566 debug_dcl(DP->flags,
1567 "checking whether disk is write protected\n");
1568 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1570 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1572 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1576 static void seek_floppy(void)
1582 debug_dcl(DP->flags, "calling disk change from %s\n", __func__);
1584 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1585 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1586 /* the media changed flag should be cleared after the seek.
1587 * If it isn't, this means that there is really no disk in
1590 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1595 if (DRS->track <= NEED_1_RECAL) {
1596 recalibrate_floppy();
1598 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1599 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1600 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1601 /* we seek to clear the media-changed condition. Does anybody
1602 * know a more elegant way, which works on all drives? */
1604 track = raw_cmd->track - 1;
1606 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1607 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1609 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1615 if (raw_cmd->track != DRS->track &&
1616 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1617 track = raw_cmd->track;
1624 do_floppy = seek_interrupt;
1625 output_byte(FD_SEEK);
1626 output_byte(UNIT(current_drive));
1627 if (output_byte(track) < 0) {
1631 debugt(__func__, "");
1634 static void recal_interrupt(void)
1636 debugt(__func__, "");
1639 else if (ST0 & ST0_ECE) {
1640 switch (DRS->track) {
1642 debugt(__func__, "need 1 recal");
1643 /* after a second recalibrate, we still haven't
1644 * reached track 0. Probably no drive. Raise an
1645 * error, as failing immediately might upset
1646 * computers possessed by the Devil :-) */
1651 debugt(__func__, "need 2 recal");
1652 /* If we already did a recalibrate,
1653 * and we are not at track 0, this
1654 * means we have moved. (The only way
1655 * not to move at recalibration is to
1656 * be already at track 0.) Clear the
1657 * new change flag */
1658 debug_dcl(DP->flags,
1659 "clearing NEWCHANGE flag because of second recalibrate\n");
1661 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1662 DRS->select_date = jiffies;
1665 debugt(__func__, "default");
1666 /* Recalibrate moves the head by at
1667 * most 80 steps. If after one
1668 * recalibrate we don't have reached
1669 * track 0, this might mean that we
1670 * started beyond track 80. Try
1672 DRS->track = NEED_1_RECAL;
1680 static void print_result(char *message, int inr)
1684 DPRINT("%s ", message);
1686 for (i = 0; i < inr; i++)
1687 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1691 /* interrupt handler. Note that this can be called externally on the Sparc */
1692 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1696 void (*handler)(void) = do_floppy;
1698 lasthandler = handler;
1699 interruptjiffies = jiffies;
1701 f = claim_dma_lock();
1703 release_dma_lock(f);
1705 floppy_enable_hlt();
1707 if (fdc >= N_FDC || FDCS->address == -1) {
1708 /* we don't even know which FDC is the culprit */
1709 pr_info("DOR0=%x\n", fdc_state[0].dor);
1710 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1711 pr_info("handler=%pf\n", handler);
1712 is_alive(__func__, "bizarre fdc");
1717 /* We have to clear the reset flag here, because apparently on boxes
1718 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1719 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1720 * emission of the SENSEI's.
1721 * It is OK to emit floppy commands because we are in an interrupt
1722 * handler here, and thus we have to fear no interference of other
1726 do_print = !handler && print_unex && initialized;
1730 print_result("unexpected interrupt", inr);
1734 output_byte(FD_SENSEI);
1737 print_result("sensei", inr);
1739 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1740 inr == 2 && max_sensei);
1746 schedule_bh(handler);
1747 is_alive(__func__, "normal interrupt end");
1749 /* FIXME! Was it really for us? */
1753 static void recalibrate_floppy(void)
1755 debugt(__func__, "");
1756 do_floppy = recal_interrupt;
1757 output_byte(FD_RECALIBRATE);
1758 if (output_byte(UNIT(current_drive)) < 0)
1763 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1765 static void reset_interrupt(void)
1767 debugt(__func__, "");
1768 result(); /* get the status ready for set_fdc */
1770 pr_info("reset set in interrupt, calling %pf\n", cont->error);
1771 cont->error(); /* a reset just after a reset. BAD! */
1777 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1778 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1780 static void reset_fdc(void)
1782 unsigned long flags;
1784 do_floppy = reset_interrupt;
1788 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1789 /* Irrelevant for systems with true DMA (i386). */
1791 flags = claim_dma_lock();
1793 release_dma_lock(flags);
1795 if (FDCS->version >= FDC_82072A)
1796 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1798 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1799 udelay(FD_RESET_DELAY);
1800 fd_outb(FDCS->dor, FD_DOR);
1804 static void show_floppy(void)
1809 pr_info("floppy driver state\n");
1810 pr_info("-------------------\n");
1811 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%pf\n",
1812 jiffies, interruptjiffies, jiffies - interruptjiffies,
1815 pr_info("timeout_message=%s\n", timeout_message);
1816 pr_info("last output bytes:\n");
1817 for (i = 0; i < OLOGSIZE; i++)
1818 pr_info("%2x %2x %lu\n",
1819 output_log[(i + output_log_pos) % OLOGSIZE].data,
1820 output_log[(i + output_log_pos) % OLOGSIZE].status,
1821 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1822 pr_info("last result at %lu\n", resultjiffies);
1823 pr_info("last redo_fd_request at %lu\n", lastredo);
1824 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1825 reply_buffer, resultsize, true);
1827 pr_info("status=%x\n", fd_inb(FD_STATUS));
1828 pr_info("fdc_busy=%lu\n", fdc_busy);
1830 pr_info("do_floppy=%pf\n", do_floppy);
1831 if (work_pending(&floppy_work))
1832 pr_info("floppy_work.func=%pf\n", floppy_work.func);
1833 if (timer_pending(&fd_timer))
1834 pr_info("fd_timer.function=%pf\n", fd_timer.function);
1835 if (timer_pending(&fd_timeout)) {
1836 pr_info("timer_function=%pf\n", fd_timeout.function);
1837 pr_info("expires=%lu\n", fd_timeout.expires - jiffies);
1838 pr_info("now=%lu\n", jiffies);
1840 pr_info("cont=%p\n", cont);
1841 pr_info("current_req=%p\n", current_req);
1842 pr_info("command_status=%d\n", command_status);
1846 static void floppy_shutdown(unsigned long data)
1848 unsigned long flags;
1854 floppy_enable_hlt();
1856 flags = claim_dma_lock();
1858 release_dma_lock(flags);
1860 /* avoid dma going to a random drive after shutdown */
1863 DPRINT("floppy timeout called\n");
1867 cont->redo(); /* this will recall reset when needed */
1869 pr_info("no cont in shutdown!\n");
1870 process_fd_request();
1872 is_alive(__func__, "");
1875 /* start motor, check media-changed condition and write protection */
1876 static int start_motor(void (*function)(void))
1882 data = UNIT(current_drive);
1883 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1884 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1886 /* no read since this drive is running */
1887 DRS->first_read_date = 0;
1888 /* note motor start time if motor is not yet running */
1889 DRS->spinup_date = jiffies;
1890 data |= (0x10 << UNIT(current_drive));
1892 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1893 mask &= ~(0x10 << UNIT(current_drive));
1895 /* starts motor and selects floppy */
1896 del_timer(motor_off_timer + current_drive);
1897 set_dor(fdc, mask, data);
1899 /* wait_for_completion also schedules reset if needed. */
1900 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1901 (timeout_fn)function);
1904 static void floppy_ready(void)
1910 if (start_motor(floppy_ready))
1915 debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1916 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1917 disk_change(current_drive) && !DP->select_delay)
1918 twaddle(); /* this clears the dcl on certain
1919 * drive/controller combinations */
1921 #ifdef fd_chose_dma_mode
1922 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1923 unsigned long flags = claim_dma_lock();
1924 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1925 release_dma_lock(flags);
1929 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1930 perpendicular_mode();
1931 fdc_specify(); /* must be done here because of hut, hlt ... */
1934 if ((raw_cmd->flags & FD_RAW_READ) ||
1935 (raw_cmd->flags & FD_RAW_WRITE))
1941 static void floppy_start(void)
1943 reschedule_timeout(current_reqD, "floppy start");
1946 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1947 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1952 * ========================================================================
1953 * here ends the bottom half. Exported routines are:
1954 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1955 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1956 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
1958 * ========================================================================
1961 * General purpose continuations.
1962 * ==============================
1965 static void do_wakeup(void)
1967 reschedule_timeout(MAXTIMEOUT, "do wakeup");
1969 command_status += 2;
1970 wake_up(&command_done);
1973 static const struct cont_t wakeup_cont = {
1977 .done = (done_f)empty
1980 static const struct cont_t intr_cont = {
1982 .redo = process_fd_request,
1984 .done = (done_f)empty
1987 static int wait_til_done(void (*handler)(void), bool interruptible)
1991 schedule_bh(handler);
1994 wait_event_interruptible(command_done, command_status >= 2);
1996 wait_event(command_done, command_status >= 2);
1998 if (command_status < 2) {
2006 command_status = FD_COMMAND_ERROR;
2007 if (command_status == FD_COMMAND_OKAY)
2011 command_status = FD_COMMAND_NONE;
2015 static void generic_done(int result)
2017 command_status = result;
2018 cont = &wakeup_cont;
2021 static void generic_success(void)
2026 static void generic_failure(void)
2031 static void success_and_wakeup(void)
2038 * formatting and rw support.
2039 * ==========================
2042 static int next_valid_format(void)
2046 probed_format = DRS->probed_format;
2048 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2049 DRS->probed_format = 0;
2052 if (floppy_type[DP->autodetect[probed_format]].sect) {
2053 DRS->probed_format = probed_format;
2060 static void bad_flp_intr(void)
2065 DRS->probed_format++;
2066 if (!next_valid_format())
2069 err_count = ++(*errors);
2070 INFBOUND(DRWE->badness, err_count);
2071 if (err_count > DP->max_errors.abort)
2073 if (err_count > DP->max_errors.reset)
2075 else if (err_count > DP->max_errors.recal)
2076 DRS->track = NEED_2_RECAL;
2079 static void set_floppy(int drive)
2081 int type = ITYPE(UDRS->fd_device);
2084 _floppy = floppy_type + type;
2086 _floppy = current_type[drive];
2090 * formatting support.
2091 * ===================
2093 static void format_interrupt(void)
2095 switch (interpret_errors()) {
2106 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2107 #define CT(x) ((x) | 0xc0)
2109 static void setup_format_params(int track)
2117 unsigned char track, head, sect, size;
2118 } *here = (struct fparm *)floppy_track_buffer;
2120 raw_cmd = &default_raw_cmd;
2121 raw_cmd->track = track;
2123 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2124 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2125 raw_cmd->rate = _floppy->rate & 0x43;
2126 raw_cmd->cmd_count = NR_F;
2127 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2128 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2129 F_SIZECODE = FD_SIZECODE(_floppy);
2130 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2131 F_GAP = _floppy->fmt_gap;
2132 F_FILL = FD_FILL_BYTE;
2134 raw_cmd->kernel_data = floppy_track_buffer;
2135 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2137 /* allow for about 30ms for data transport per track */
2138 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2140 /* a ``cylinder'' is two tracks plus a little stepping time */
2141 track_shift = 2 * head_shift + 3;
2143 /* position of logical sector 1 on this track */
2144 n = (track_shift * format_req.track + head_shift * format_req.head)
2147 /* determine interleave */
2149 if (_floppy->fmt_gap < 0x22)
2152 /* initialize field */
2153 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2154 here[count].track = format_req.track;
2155 here[count].head = format_req.head;
2156 here[count].sect = 0;
2157 here[count].size = F_SIZECODE;
2159 /* place logical sectors */
2160 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2161 here[n].sect = count;
2162 n = (n + il) % F_SECT_PER_TRACK;
2163 if (here[n].sect) { /* sector busy, find next free sector */
2165 if (n >= F_SECT_PER_TRACK) {
2166 n -= F_SECT_PER_TRACK;
2167 while (here[n].sect)
2172 if (_floppy->stretch & FD_SECTBASEMASK) {
2173 for (count = 0; count < F_SECT_PER_TRACK; count++)
2174 here[count].sect += FD_SECTBASE(_floppy) - 1;
2178 static void redo_format(void)
2181 setup_format_params(format_req.track << STRETCH(_floppy));
2183 debugt(__func__, "queue format request");
2186 static const struct cont_t format_cont = {
2187 .interrupt = format_interrupt,
2188 .redo = redo_format,
2189 .error = bad_flp_intr,
2190 .done = generic_done
2193 static int do_format(int drive, struct format_descr *tmp_format_req)
2197 if (lock_fdc(drive, true))
2202 _floppy->track > DP->tracks ||
2203 tmp_format_req->track >= _floppy->track ||
2204 tmp_format_req->head >= _floppy->head ||
2205 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2206 !_floppy->fmt_gap) {
2207 process_fd_request();
2210 format_req = *tmp_format_req;
2212 cont = &format_cont;
2213 errors = &format_errors;
2214 ret = wait_til_done(redo_format, true);
2217 process_fd_request();
2222 * Buffer read/write and support
2223 * =============================
2226 static void floppy_end_request(struct request *req, int error)
2228 unsigned int nr_sectors = current_count_sectors;
2229 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2231 /* current_count_sectors can be zero if transfer failed */
2233 nr_sectors = blk_rq_cur_sectors(req);
2234 if (__blk_end_request(req, error, nr_sectors << 9))
2237 /* We're done with the request */
2242 /* new request_done. Can handle physical sectors which are smaller than a
2244 static void request_done(int uptodate)
2246 struct request_queue *q = floppy_queue;
2247 struct request *req = current_req;
2248 unsigned long flags;
2250 char msg[sizeof("request done ") + sizeof(int) * 3];
2253 snprintf(msg, sizeof(msg), "request done %d", uptodate);
2254 reschedule_timeout(MAXTIMEOUT, msg);
2257 pr_info("floppy.c: no request in request_done\n");
2262 /* maintain values for invalidation on geometry
2264 block = current_count_sectors + blk_rq_pos(req);
2265 INFBOUND(DRS->maxblock, block);
2266 if (block > _floppy->sect)
2269 /* unlock chained buffers */
2270 spin_lock_irqsave(q->queue_lock, flags);
2271 floppy_end_request(req, 0);
2272 spin_unlock_irqrestore(q->queue_lock, flags);
2274 if (rq_data_dir(req) == WRITE) {
2275 /* record write error information */
2276 DRWE->write_errors++;
2277 if (DRWE->write_errors == 1) {
2278 DRWE->first_error_sector = blk_rq_pos(req);
2279 DRWE->first_error_generation = DRS->generation;
2281 DRWE->last_error_sector = blk_rq_pos(req);
2282 DRWE->last_error_generation = DRS->generation;
2284 spin_lock_irqsave(q->queue_lock, flags);
2285 floppy_end_request(req, -EIO);
2286 spin_unlock_irqrestore(q->queue_lock, flags);
2290 /* Interrupt handler evaluating the result of the r/w operation */
2291 static void rw_interrupt(void)
2299 /* some Toshiba floppy controllers occasionnally seem to
2300 * return bogus interrupts after read/write operations, which
2301 * can be recognized by a bad head number (>= 2) */
2305 if (!DRS->first_read_date)
2306 DRS->first_read_date = jiffies;
2309 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2321 nr_sectors = (((R_TRACK - TRACK) * heads +
2322 R_HEAD - HEAD) * SECT_PER_TRACK +
2323 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2325 if (nr_sectors / ssize >
2326 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2327 DPRINT("long rw: %x instead of %lx\n",
2328 nr_sectors, current_count_sectors);
2329 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2330 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2331 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2332 pr_info("heads=%d eoc=%d\n", heads, eoc);
2333 pr_info("spt=%d st=%d ss=%d\n",
2334 SECT_PER_TRACK, fsector_t, ssize);
2335 pr_info("in_sector_offset=%d\n", in_sector_offset);
2338 nr_sectors -= in_sector_offset;
2339 INFBOUND(nr_sectors, 0);
2340 SUPBOUND(current_count_sectors, nr_sectors);
2342 switch (interpret_errors()) {
2347 if (!current_count_sectors) {
2354 if (!current_count_sectors) {
2358 current_type[current_drive] = _floppy;
2359 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2364 if (DP->flags & FTD_MSG)
2365 DPRINT("Auto-detected floppy type %s in fd%d\n",
2366 _floppy->name, current_drive);
2367 current_type[current_drive] = _floppy;
2368 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2372 if (CT(COMMAND) != FD_READ ||
2373 raw_cmd->kernel_data == current_req->buffer) {
2374 /* transfer directly from buffer */
2376 } else if (CT(COMMAND) == FD_READ) {
2377 buffer_track = raw_cmd->track;
2378 buffer_drive = current_drive;
2379 INFBOUND(buffer_max, nr_sectors + fsector_t);
2384 /* Compute maximal contiguous buffer size. */
2385 static int buffer_chain_size(void)
2389 struct req_iterator iter;
2392 base = bio_data(current_req->bio);
2395 rq_for_each_segment(bv, current_req, iter) {
2396 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2405 /* Compute the maximal transfer size */
2406 static int transfer_size(int ssize, int max_sector, int max_size)
2408 SUPBOUND(max_sector, fsector_t + max_size);
2411 max_sector -= (max_sector % _floppy->sect) % ssize;
2413 /* transfer size, beginning not aligned */
2414 current_count_sectors = max_sector - fsector_t;
2420 * Move data from/to the track buffer to/from the buffer cache.
2422 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2424 int remaining; /* number of transferred 512-byte sectors */
2429 struct req_iterator iter;
2431 max_sector = transfer_size(ssize,
2432 min(max_sector, max_sector_2),
2433 blk_rq_sectors(current_req));
2435 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2436 buffer_max > fsector_t + blk_rq_sectors(current_req))
2437 current_count_sectors = min_t(int, buffer_max - fsector_t,
2438 blk_rq_sectors(current_req));
2440 remaining = current_count_sectors << 9;
2441 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2442 DPRINT("in copy buffer\n");
2443 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2444 pr_info("remaining=%d\n", remaining >> 9);
2445 pr_info("current_req->nr_sectors=%u\n",
2446 blk_rq_sectors(current_req));
2447 pr_info("current_req->current_nr_sectors=%u\n",
2448 blk_rq_cur_sectors(current_req));
2449 pr_info("max_sector=%d\n", max_sector);
2450 pr_info("ssize=%d\n", ssize);
2453 buffer_max = max(max_sector, buffer_max);
2455 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2457 size = blk_rq_cur_bytes(current_req);
2459 rq_for_each_segment(bv, current_req, iter) {
2464 SUPBOUND(size, remaining);
2466 buffer = page_address(bv->bv_page) + bv->bv_offset;
2467 if (dma_buffer + size >
2468 floppy_track_buffer + (max_buffer_sectors << 10) ||
2469 dma_buffer < floppy_track_buffer) {
2470 DPRINT("buffer overrun in copy buffer %d\n",
2471 (int)((floppy_track_buffer - dma_buffer) >> 9));
2472 pr_info("fsector_t=%d buffer_min=%d\n",
2473 fsector_t, buffer_min);
2474 pr_info("current_count_sectors=%ld\n",
2475 current_count_sectors);
2476 if (CT(COMMAND) == FD_READ)
2478 if (CT(COMMAND) == FD_WRITE)
2482 if (((unsigned long)buffer) % 512)
2483 DPRINT("%p buffer not aligned\n", buffer);
2485 if (CT(COMMAND) == FD_READ)
2486 memcpy(buffer, dma_buffer, size);
2488 memcpy(dma_buffer, buffer, size);
2495 max_sector -= remaining >> 9;
2496 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2500 /* work around a bug in pseudo DMA
2501 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2502 * sending data. Hence we need a different way to signal the
2503 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2504 * does not work with MT, hence we can only transfer one head at
2507 static void virtualdmabug_workaround(void)
2512 if (CT(COMMAND) == FD_WRITE) {
2513 COMMAND &= ~0x80; /* switch off multiple track mode */
2515 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2516 end_sector = SECTOR + hard_sectors - 1;
2517 if (end_sector > SECT_PER_TRACK) {
2518 pr_info("too many sectors %d > %d\n",
2519 end_sector, SECT_PER_TRACK);
2522 SECT_PER_TRACK = end_sector;
2523 /* make sure SECT_PER_TRACK
2524 * points to end of transfer */
2529 * Formulate a read/write request.
2530 * this routine decides where to load the data (directly to buffer, or to
2531 * tmp floppy area), how much data to load (the size of the buffer, the whole
2532 * track, or a single sector)
2533 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2534 * allocation on the fly, it should be done here. No other part should need
2538 static int make_raw_rw_request(void)
2540 int aligned_sector_t;
2546 if (WARN(max_buffer_sectors == 0, "VFS: Block I/O scheduled on unopened device\n"))
2549 set_fdc((long)current_req->rq_disk->private_data);
2551 raw_cmd = &default_raw_cmd;
2552 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2554 raw_cmd->cmd_count = NR_RW;
2555 if (rq_data_dir(current_req) == READ) {
2556 raw_cmd->flags |= FD_RAW_READ;
2557 COMMAND = FM_MODE(_floppy, FD_READ);
2558 } else if (rq_data_dir(current_req) == WRITE) {
2559 raw_cmd->flags |= FD_RAW_WRITE;
2560 COMMAND = FM_MODE(_floppy, FD_WRITE);
2562 DPRINT("%s: unknown command\n", __func__);
2566 max_sector = _floppy->sect * _floppy->head;
2568 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2569 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2570 if (_floppy->track && TRACK >= _floppy->track) {
2571 if (blk_rq_cur_sectors(current_req) & 1) {
2572 current_count_sectors = 1;
2577 HEAD = fsector_t / _floppy->sect;
2579 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2580 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2581 fsector_t < _floppy->sect)
2582 max_sector = _floppy->sect;
2584 /* 2M disks have phantom sectors on the first track */
2585 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2586 max_sector = 2 * _floppy->sect / 3;
2587 if (fsector_t >= max_sector) {
2588 current_count_sectors =
2589 min_t(int, _floppy->sect - fsector_t,
2590 blk_rq_sectors(current_req));
2595 SIZECODE = FD_SIZECODE(_floppy);
2596 raw_cmd->rate = _floppy->rate & 0x43;
2597 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2604 raw_cmd->track = TRACK << STRETCH(_floppy);
2605 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2607 ssize = DIV_ROUND_UP(1 << SIZECODE, 4);
2608 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2609 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2610 FD_SECTBASE(_floppy);
2612 /* tracksize describes the size which can be filled up with sectors
2615 tracksize = _floppy->sect - _floppy->sect % ssize;
2616 if (tracksize < _floppy->sect) {
2618 if (tracksize <= fsector_t % _floppy->sect)
2621 /* if we are beyond tracksize, fill up using smaller sectors */
2622 while (tracksize <= fsector_t % _floppy->sect) {
2623 while (tracksize + ssize > _floppy->sect) {
2631 max_sector = HEAD * _floppy->sect + tracksize;
2632 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2633 max_sector = _floppy->sect;
2634 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2635 /* for virtual DMA bug workaround */
2636 max_sector = _floppy->sect;
2639 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2640 aligned_sector_t = fsector_t - in_sector_offset;
2641 max_size = blk_rq_sectors(current_req);
2642 if ((raw_cmd->track == buffer_track) &&
2643 (current_drive == buffer_drive) &&
2644 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2645 /* data already in track buffer */
2646 if (CT(COMMAND) == FD_READ) {
2647 copy_buffer(1, max_sector, buffer_max);
2650 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2651 if (CT(COMMAND) == FD_WRITE) {
2652 unsigned int sectors;
2654 sectors = fsector_t + blk_rq_sectors(current_req);
2655 if (sectors > ssize && sectors < ssize + ssize)
2656 max_size = ssize + ssize;
2660 raw_cmd->flags &= ~FD_RAW_WRITE;
2661 raw_cmd->flags |= FD_RAW_READ;
2662 COMMAND = FM_MODE(_floppy, FD_READ);
2663 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2664 unsigned long dma_limit;
2665 int direct, indirect;
2668 transfer_size(ssize, max_sector,
2669 max_buffer_sectors * 2) - fsector_t;
2672 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2673 * on a 64 bit machine!
2675 max_size = buffer_chain_size();
2676 dma_limit = (MAX_DMA_ADDRESS -
2677 ((unsigned long)current_req->buffer)) >> 9;
2678 if ((unsigned long)max_size > dma_limit)
2679 max_size = dma_limit;
2680 /* 64 kb boundaries */
2681 if (CROSS_64KB(current_req->buffer, max_size << 9))
2683 ((unsigned long)current_req->buffer) %
2685 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2687 * We try to read tracks, but if we get too many errors, we
2688 * go back to reading just one sector at a time.
2690 * This means we should be able to read a sector even if there
2691 * are other bad sectors on this track.
2694 (indirect * 2 > direct * 3 &&
2695 *errors < DP->max_errors.read_track &&
2697 (DP->read_track & (1 << DRS->probed_format)))))) {
2698 max_size = blk_rq_sectors(current_req);
2700 raw_cmd->kernel_data = current_req->buffer;
2701 raw_cmd->length = current_count_sectors << 9;
2702 if (raw_cmd->length == 0) {
2703 DPRINT("%s: zero dma transfer attempted\n", __func__);
2704 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2705 indirect, direct, fsector_t);
2708 virtualdmabug_workaround();
2713 if (CT(COMMAND) == FD_READ)
2714 max_size = max_sector; /* unbounded */
2716 /* claim buffer track if needed */
2717 if (buffer_track != raw_cmd->track || /* bad track */
2718 buffer_drive != current_drive || /* bad drive */
2719 fsector_t > buffer_max ||
2720 fsector_t < buffer_min ||
2721 ((CT(COMMAND) == FD_READ ||
2722 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2723 max_sector > 2 * max_buffer_sectors + buffer_min &&
2724 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2725 /* not enough space */
2727 buffer_drive = current_drive;
2728 buffer_max = buffer_min = aligned_sector_t;
2730 raw_cmd->kernel_data = floppy_track_buffer +
2731 ((aligned_sector_t - buffer_min) << 9);
2733 if (CT(COMMAND) == FD_WRITE) {
2734 /* copy write buffer to track buffer.
2735 * if we get here, we know that the write
2736 * is either aligned or the data already in the buffer
2737 * (buffer will be overwritten) */
2738 if (in_sector_offset && buffer_track == -1)
2739 DPRINT("internal error offset !=0 on write\n");
2740 buffer_track = raw_cmd->track;
2741 buffer_drive = current_drive;
2742 copy_buffer(ssize, max_sector,
2743 2 * max_buffer_sectors + buffer_min);
2745 transfer_size(ssize, max_sector,
2746 2 * max_buffer_sectors + buffer_min -
2749 /* round up current_count_sectors to get dma xfer size */
2750 raw_cmd->length = in_sector_offset + current_count_sectors;
2751 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2752 raw_cmd->length <<= 9;
2753 if ((raw_cmd->length < current_count_sectors << 9) ||
2754 (raw_cmd->kernel_data != current_req->buffer &&
2755 CT(COMMAND) == FD_WRITE &&
2756 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2757 aligned_sector_t < buffer_min)) ||
2758 raw_cmd->length % (128 << SIZECODE) ||
2759 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2760 DPRINT("fractionary current count b=%lx s=%lx\n",
2761 raw_cmd->length, current_count_sectors);
2762 if (raw_cmd->kernel_data != current_req->buffer)
2763 pr_info("addr=%d, length=%ld\n",
2764 (int)((raw_cmd->kernel_data -
2765 floppy_track_buffer) >> 9),
2766 current_count_sectors);
2767 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2768 fsector_t, aligned_sector_t, max_sector, max_size);
2769 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2770 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2771 COMMAND, SECTOR, HEAD, TRACK);
2772 pr_info("buffer drive=%d\n", buffer_drive);
2773 pr_info("buffer track=%d\n", buffer_track);
2774 pr_info("buffer_min=%d\n", buffer_min);
2775 pr_info("buffer_max=%d\n", buffer_max);
2779 if (raw_cmd->kernel_data != current_req->buffer) {
2780 if (raw_cmd->kernel_data < floppy_track_buffer ||
2781 current_count_sectors < 0 ||
2782 raw_cmd->length < 0 ||
2783 raw_cmd->kernel_data + raw_cmd->length >
2784 floppy_track_buffer + (max_buffer_sectors << 10)) {
2785 DPRINT("buffer overrun in schedule dma\n");
2786 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2787 fsector_t, buffer_min, raw_cmd->length >> 9);
2788 pr_info("current_count_sectors=%ld\n",
2789 current_count_sectors);
2790 if (CT(COMMAND) == FD_READ)
2792 if (CT(COMMAND) == FD_WRITE)
2796 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2797 current_count_sectors > blk_rq_sectors(current_req)) {
2798 DPRINT("buffer overrun in direct transfer\n");
2800 } else if (raw_cmd->length < current_count_sectors << 9) {
2801 DPRINT("more sectors than bytes\n");
2802 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2803 pr_info("sectors=%ld\n", current_count_sectors);
2805 if (raw_cmd->length == 0) {
2806 DPRINT("zero dma transfer attempted from make_raw_request\n");
2810 virtualdmabug_workaround();
2814 static void redo_fd_request(void)
2820 if (current_drive < N_DRIVE)
2821 floppy_off(current_drive);
2825 struct request *req;
2827 spin_lock_irq(floppy_queue->queue_lock);
2828 req = blk_fetch_request(floppy_queue);
2829 spin_unlock_irq(floppy_queue->queue_lock);
2837 drive = (long)current_req->rq_disk->private_data;
2839 reschedule_timeout(current_reqD, "redo fd request");
2842 raw_cmd = &default_raw_cmd;
2844 if (start_motor(redo_fd_request))
2847 disk_change(current_drive);
2848 if (test_bit(current_drive, &fake_change) ||
2849 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2850 DPRINT("disk absent or changed during operation\n");
2854 if (!_floppy) { /* Autodetection */
2856 DRS->probed_format = 0;
2857 if (next_valid_format()) {
2858 DPRINT("no autodetectable formats\n");
2865 _floppy = floppy_type + DP->autodetect[DRS->probed_format];
2868 errors = &(current_req->errors);
2869 tmp = make_raw_rw_request();
2875 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2877 schedule_bh(floppy_start);
2878 debugt(__func__, "queue fd request");
2882 static const struct cont_t rw_cont = {
2883 .interrupt = rw_interrupt,
2884 .redo = redo_fd_request,
2885 .error = bad_flp_intr,
2886 .done = request_done
2889 static void process_fd_request(void)
2892 schedule_bh(redo_fd_request);
2895 static void do_fd_request(struct request_queue *q)
2897 if (WARN(max_buffer_sectors == 0,
2898 "VFS: %s called on non-open device\n", __func__))
2901 if (WARN(atomic_read(&usage_count) == 0,
2902 "warning: usage count=0, current_req=%p sect=%ld type=%x flags=%x\n",
2903 current_req, (long)blk_rq_pos(current_req), current_req->cmd_type,
2904 current_req->cmd_flags))
2907 if (test_bit(0, &fdc_busy)) {
2908 /* fdc busy, this new request will be treated when the
2909 current one is done */
2910 is_alive(__func__, "old request running");
2913 lock_fdc(MAXTIMEOUT, false);
2914 process_fd_request();
2915 is_alive(__func__, "");
2918 static const struct cont_t poll_cont = {
2919 .interrupt = success_and_wakeup,
2920 .redo = floppy_ready,
2921 .error = generic_failure,
2922 .done = generic_done
2925 static int poll_drive(bool interruptible, int flag)
2927 /* no auto-sense, just clear dcl */
2928 raw_cmd = &default_raw_cmd;
2929 raw_cmd->flags = flag;
2931 raw_cmd->cmd_count = 0;
2933 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
2934 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
2936 return wait_til_done(floppy_ready, interruptible);
2940 * User triggered reset
2941 * ====================
2944 static void reset_intr(void)
2946 pr_info("weird, reset interrupt called\n");
2949 static const struct cont_t reset_cont = {
2950 .interrupt = reset_intr,
2951 .redo = success_and_wakeup,
2952 .error = generic_failure,
2953 .done = generic_done
2956 static int user_reset_fdc(int drive, int arg, bool interruptible)
2960 if (lock_fdc(drive, interruptible))
2963 if (arg == FD_RESET_ALWAYS)
2967 ret = wait_til_done(reset_fdc, interruptible);
2971 process_fd_request();
2976 * Misc Ioctl's and support
2977 * ========================
2979 static inline int fd_copyout(void __user *param, const void *address,
2982 return copy_to_user(param, address, size) ? -EFAULT : 0;
2985 static inline int fd_copyin(void __user *param, void *address,
2988 return copy_from_user(address, param, size) ? -EFAULT : 0;
2991 static const char *drive_name(int type, int drive)
2993 struct floppy_struct *floppy;
2996 floppy = floppy_type + type;
2998 if (UDP->native_format)
2999 floppy = floppy_type + UDP->native_format;
3004 return floppy->name;
3010 static void raw_cmd_done(int flag)
3015 raw_cmd->flags |= FD_RAW_FAILURE;
3016 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3018 raw_cmd->reply_count = inr;
3019 if (raw_cmd->reply_count > MAX_REPLIES)
3020 raw_cmd->reply_count = 0;
3021 for (i = 0; i < raw_cmd->reply_count; i++)
3022 raw_cmd->reply[i] = reply_buffer[i];
3024 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3025 unsigned long flags;
3026 flags = claim_dma_lock();
3027 raw_cmd->length = fd_get_dma_residue();
3028 release_dma_lock(flags);
3031 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3032 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3033 raw_cmd->flags |= FD_RAW_FAILURE;
3035 if (disk_change(current_drive))
3036 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3038 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3039 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3040 motor_off_callback(current_drive);
3042 if (raw_cmd->next &&
3043 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3044 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3045 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3046 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3047 raw_cmd = raw_cmd->next;
3054 static const struct cont_t raw_cmd_cont = {
3055 .interrupt = success_and_wakeup,
3056 .redo = floppy_start,
3057 .error = generic_failure,
3058 .done = raw_cmd_done
3061 static int raw_cmd_copyout(int cmd, void __user *param,
3062 struct floppy_raw_cmd *ptr)
3067 ret = copy_to_user(param, ptr, sizeof(*ptr));
3070 param += sizeof(struct floppy_raw_cmd);
3071 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3072 if (ptr->length >= 0 &&
3073 ptr->length <= ptr->buffer_length) {
3074 long length = ptr->buffer_length - ptr->length;
3075 ret = fd_copyout(ptr->data, ptr->kernel_data,
3087 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3089 struct floppy_raw_cmd *next;
3090 struct floppy_raw_cmd *this;
3095 if (this->buffer_length) {
3096 fd_dma_mem_free((unsigned long)this->kernel_data,
3097 this->buffer_length);
3098 this->buffer_length = 0;
3106 static int raw_cmd_copyin(int cmd, void __user *param,
3107 struct floppy_raw_cmd **rcmd)
3109 struct floppy_raw_cmd *ptr;
3116 ptr = kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3120 ret = copy_from_user(ptr, param, sizeof(*ptr));
3124 ptr->buffer_length = 0;
3125 param += sizeof(struct floppy_raw_cmd);
3126 if (ptr->cmd_count > 33)
3127 /* the command may now also take up the space
3128 * initially intended for the reply & the
3129 * reply count. Needed for long 82078 commands
3130 * such as RESTORE, which takes ... 17 command
3131 * bytes. Murphy's law #137: When you reserve
3132 * 16 bytes for a structure, you'll one day
3133 * discover that you really need 17...
3137 for (i = 0; i < 16; i++)
3139 ptr->resultcode = 0;
3140 ptr->kernel_data = NULL;
3142 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3143 if (ptr->length <= 0)
3145 ptr->kernel_data = (char *)fd_dma_mem_alloc(ptr->length);
3146 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3147 if (!ptr->kernel_data)
3149 ptr->buffer_length = ptr->length;
3151 if (ptr->flags & FD_RAW_WRITE) {
3152 ret = fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3157 if (ptr->flags & FD_RAW_MORE) {
3158 rcmd = &(ptr->next);
3166 static int raw_cmd_ioctl(int cmd, void __user *param)
3168 struct floppy_raw_cmd *my_raw_cmd;
3173 if (FDCS->rawcmd <= 1)
3175 for (drive = 0; drive < N_DRIVE; drive++) {
3176 if (FDC(drive) != fdc)
3178 if (drive == current_drive) {
3179 if (UDRS->fd_ref > 1) {
3183 } else if (UDRS->fd_ref) {
3192 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3194 raw_cmd_free(&my_raw_cmd);
3198 raw_cmd = my_raw_cmd;
3199 cont = &raw_cmd_cont;
3200 ret = wait_til_done(floppy_start, true);
3201 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3203 if (ret != -EINTR && FDCS->reset)
3206 DRS->track = NO_TRACK;
3208 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3211 raw_cmd_free(&my_raw_cmd);
3215 static int invalidate_drive(struct block_device *bdev)
3217 /* invalidate the buffer track to force a reread */
3218 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3219 process_fd_request();
3220 check_disk_change(bdev);
3224 static int set_geometry(unsigned int cmd, struct floppy_struct *g,
3225 int drive, int type, struct block_device *bdev)
3229 /* sanity checking for parameters. */
3232 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3233 /* check if reserved bits are set */
3234 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3237 if (!capable(CAP_SYS_ADMIN))
3239 mutex_lock(&open_lock);
3240 if (lock_fdc(drive, true)) {
3241 mutex_unlock(&open_lock);
3244 floppy_type[type] = *g;
3245 floppy_type[type].name = "user format";
3246 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3247 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3248 floppy_type[type].size + 1;
3249 process_fd_request();
3250 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3251 struct block_device *bdev = opened_bdev[cnt];
3252 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3254 __invalidate_device(bdev);
3256 mutex_unlock(&open_lock);
3260 if (lock_fdc(drive, true))
3262 if (cmd != FDDEFPRM) {
3263 /* notice a disk change immediately, else
3264 * we lose our settings immediately*/
3265 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3268 oldStretch = g->stretch;
3269 user_params[drive] = *g;
3270 if (buffer_drive == drive)
3271 SUPBOUND(buffer_max, user_params[drive].sect);
3272 current_type[drive] = &user_params[drive];
3273 floppy_sizes[drive] = user_params[drive].size;
3274 if (cmd == FDDEFPRM)
3275 DRS->keep_data = -1;
3278 /* invalidation. Invalidate only when needed, i.e.
3279 * when there are already sectors in the buffer cache
3280 * whose number will change. This is useful, because
3281 * mtools often changes the geometry of the disk after
3282 * looking at the boot block */
3283 if (DRS->maxblock > user_params[drive].sect ||
3285 ((user_params[drive].sect ^ oldStretch) &
3286 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3287 invalidate_drive(bdev);
3289 process_fd_request();
3294 /* handle obsolete ioctl's */
3295 static unsigned int ioctl_table[] = {
3323 static int normalize_ioctl(unsigned int *cmd, int *size)
3327 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3328 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3329 *size = _IOC_SIZE(*cmd);
3330 *cmd = ioctl_table[i];
3331 if (*size > _IOC_SIZE(*cmd)) {
3332 pr_info("ioctl not yet supported\n");
3341 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3344 *g = &floppy_type[type];
3346 if (lock_fdc(drive, false))
3348 if (poll_drive(false, 0) == -EINTR)
3350 process_fd_request();
3351 *g = current_type[drive];
3358 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3360 int drive = (long)bdev->bd_disk->private_data;
3361 int type = ITYPE(drive_state[drive].fd_device);
3362 struct floppy_struct *g;
3365 ret = get_floppy_geometry(drive, type, &g);
3369 geo->heads = g->head;
3370 geo->sectors = g->sect;
3371 geo->cylinders = g->track;
3375 static int fd_locked_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3376 unsigned long param)
3378 int drive = (long)bdev->bd_disk->private_data;
3379 int type = ITYPE(UDRS->fd_device);
3384 struct floppy_struct g; /* geometry */
3385 struct format_descr f;
3386 struct floppy_max_errors max_errors;
3387 struct floppy_drive_params dp;
3388 } inparam; /* parameters coming from user space */
3389 const void *outparam; /* parameters passed back to user space */
3391 /* convert compatibility eject ioctls into floppy eject ioctl.
3392 * We do this in order to provide a means to eject floppy disks before
3393 * installing the new fdutils package */
3394 if (cmd == CDROMEJECT || /* CD-ROM eject */
3395 cmd == 0x6470) { /* SunOS floppy eject */
3396 DPRINT("obsolete eject ioctl\n");
3397 DPRINT("please use floppycontrol --eject\n");
3401 if (!((cmd & 0xff00) == 0x0200))
3404 /* convert the old style command into a new style command */
3405 ret = normalize_ioctl(&cmd, &size);
3409 /* permission checks */
3410 if (((cmd & 0x40) && !(mode & (FMODE_WRITE | FMODE_WRITE_IOCTL))) ||
3411 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3414 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3418 memset(&inparam, 0, sizeof(inparam));
3419 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3420 ret = fd_copyin((void __user *)param, &inparam, size);
3427 if (UDRS->fd_ref != 1)
3428 /* somebody else has this drive open */
3430 if (lock_fdc(drive, true))
3433 /* do the actual eject. Fails on
3434 * non-Sparc architectures */
3435 ret = fd_eject(UNIT(drive));
3437 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3438 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3439 process_fd_request();
3442 if (lock_fdc(drive, true))
3444 current_type[drive] = NULL;
3445 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3446 UDRS->keep_data = 0;
3447 return invalidate_drive(bdev);
3450 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3452 ret = get_floppy_geometry(drive, type,
3453 (struct floppy_struct **)&outparam);
3458 UDP->flags |= FTD_MSG;
3461 UDP->flags &= ~FTD_MSG;
3464 if (lock_fdc(drive, true))
3466 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3469 process_fd_request();
3470 if (ret & FD_VERIFY)
3472 if (!(ret & FD_DISK_WRITABLE))
3476 if (UDRS->fd_ref != 1)
3478 return do_format(drive, &inparam.f);
3481 if (lock_fdc(drive, true))
3483 return invalidate_drive(bdev);
3484 case FDSETEMSGTRESH:
3485 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3488 outparam = &UDP->max_errors;
3491 UDP->max_errors = inparam.max_errors;
3494 outparam = drive_name(type, drive);
3495 SUPBOUND(size, strlen((const char *)outparam) + 1);
3504 if (lock_fdc(drive, true))
3506 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3508 process_fd_request();
3514 return user_reset_fdc(drive, (int)param, true);
3519 memset(UDRWE, 0, sizeof(*UDRWE));
3527 if (lock_fdc(drive, true))
3530 i = raw_cmd_ioctl(cmd, (void __user *)param);
3533 process_fd_request();
3536 if (lock_fdc(drive, true))
3539 process_fd_request();
3545 if (_IOC_DIR(cmd) & _IOC_READ)
3546 return fd_copyout((void __user *)param, outparam, size);
3551 static int fd_ioctl(struct block_device *bdev, fmode_t mode,
3552 unsigned int cmd, unsigned long param)
3557 ret = fd_locked_ioctl(bdev, mode, cmd, param);
3563 static void __init config_types(void)
3565 bool has_drive = false;
3568 /* read drive info out of physical CMOS */
3571 UDP->cmos = FLOPPY0_TYPE;
3573 if (!UDP->cmos && FLOPPY1_TYPE)
3574 UDP->cmos = FLOPPY1_TYPE;
3576 /* FIXME: additional physical CMOS drive detection should go here */
3578 for (drive = 0; drive < N_DRIVE; drive++) {
3579 unsigned int type = UDP->cmos;
3580 struct floppy_drive_params *params;
3581 const char *name = NULL;
3582 static char temparea[32];
3584 if (type < ARRAY_SIZE(default_drive_params)) {
3585 params = &default_drive_params[type].params;
3587 name = default_drive_params[type].name;
3588 allowed_drive_mask |= 1 << drive;
3590 allowed_drive_mask &= ~(1 << drive);
3592 params = &default_drive_params[0].params;
3593 sprintf(temparea, "unknown type %d (usb?)", type);
3597 const char *prepend;
3601 pr_info("Floppy drive(s):");
3606 pr_cont("%s fd%d is %s", prepend, drive, name);
3615 static int floppy_release(struct gendisk *disk, fmode_t mode)
3617 int drive = (long)disk->private_data;
3620 mutex_lock(&open_lock);
3621 if (UDRS->fd_ref < 0)
3623 else if (!UDRS->fd_ref--) {
3624 DPRINT("floppy_release with fd_ref == 0");
3628 opened_bdev[drive] = NULL;
3629 mutex_unlock(&open_lock);
3636 * floppy_open check for aliasing (/dev/fd0 can be the same as
3637 * /dev/PS0 etc), and disallows simultaneous access to the same
3638 * drive with different device numbers.
3640 static int floppy_open(struct block_device *bdev, fmode_t mode)
3642 int drive = (long)bdev->bd_disk->private_data;
3643 int old_dev, new_dev;
3649 mutex_lock(&open_lock);
3650 old_dev = UDRS->fd_device;
3651 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3654 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3655 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3656 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3659 if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
3662 if (mode & FMODE_EXCL)
3667 opened_bdev[drive] = bdev;
3671 if (!floppy_track_buffer) {
3672 /* if opening an ED drive, reserve a big buffer,
3673 * else reserve a small one */
3674 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3675 try = 64; /* Only 48 actually useful */
3677 try = 32; /* Only 24 actually useful */
3679 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3680 if (!tmp && !floppy_track_buffer) {
3681 try >>= 1; /* buffer only one side */
3683 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3685 if (!tmp && !floppy_track_buffer)
3686 fallback_on_nodma_alloc(&tmp, 2048 * try);
3687 if (!tmp && !floppy_track_buffer) {
3688 DPRINT("Unable to allocate DMA memory\n");
3691 if (floppy_track_buffer) {
3693 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3695 buffer_min = buffer_max = -1;
3696 floppy_track_buffer = tmp;
3697 max_buffer_sectors = try;
3701 new_dev = MINOR(bdev->bd_dev);
3702 UDRS->fd_device = new_dev;
3703 set_capacity(disks[drive], floppy_sizes[new_dev]);
3704 if (old_dev != -1 && old_dev != new_dev) {
3705 if (buffer_drive == drive)
3709 if (UFDCS->rawcmd == 1)
3712 if (!(mode & FMODE_NDELAY)) {
3713 if (mode & (FMODE_READ|FMODE_WRITE)) {
3714 UDRS->last_checked = 0;
3715 check_disk_change(bdev);
3716 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
3720 if ((mode & FMODE_WRITE) &&
3721 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
3724 mutex_unlock(&open_lock);
3728 if (UDRS->fd_ref < 0)
3733 opened_bdev[drive] = NULL;
3735 mutex_unlock(&open_lock);
3741 * Check if the disk has been changed or if a change has been faked.
3743 static int check_floppy_change(struct gendisk *disk)
3745 int drive = (long)disk->private_data;
3747 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3748 test_bit(FD_VERIFY_BIT, &UDRS->flags))
3751 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3752 lock_fdc(drive, false);
3753 poll_drive(false, 0);
3754 process_fd_request();
3757 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3758 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3759 test_bit(drive, &fake_change) ||
3760 (!ITYPE(UDRS->fd_device) && !current_type[drive]))
3766 * This implements "read block 0" for floppy_revalidate().
3767 * Needed for format autodetection, checking whether there is
3768 * a disk in the drive, and whether that disk is writable.
3771 static void floppy_rb0_complete(struct bio *bio, int err)
3773 complete((struct completion *)bio->bi_private);
3776 static int __floppy_read_block_0(struct block_device *bdev)
3779 struct bio_vec bio_vec;
3780 struct completion complete;
3784 page = alloc_page(GFP_NOIO);
3786 process_fd_request();
3790 size = bdev->bd_block_size;
3795 bio.bi_io_vec = &bio_vec;
3796 bio_vec.bv_page = page;
3797 bio_vec.bv_len = size;
3798 bio_vec.bv_offset = 0;
3804 bio.bi_flags = BIO_QUIET;
3805 init_completion(&complete);
3806 bio.bi_private = &complete;
3807 bio.bi_end_io = floppy_rb0_complete;
3809 submit_bio(READ, &bio);
3810 generic_unplug_device(bdev_get_queue(bdev));
3811 process_fd_request();
3812 wait_for_completion(&complete);
3819 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3820 * the bootblock (block 0). "Autodetection" is also needed to check whether
3821 * there is a disk in the drive at all... Thus we also do it for fixed
3822 * geometry formats */
3823 static int floppy_revalidate(struct gendisk *disk)
3825 int drive = (long)disk->private_data;
3826 #define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
3830 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3831 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3832 test_bit(drive, &fake_change) || NO_GEOM) {
3833 if (WARN(atomic_read(&usage_count) == 0,
3834 "VFS: revalidate called on non-open device.\n"))
3837 lock_fdc(drive, false);
3838 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3839 test_bit(FD_VERIFY_BIT, &UDRS->flags));
3840 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
3841 process_fd_request(); /*already done by another thread */
3846 if (buffer_drive == drive)
3848 clear_bit(drive, &fake_change);
3849 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3854 res = __floppy_read_block_0(opened_bdev[drive]);
3857 poll_drive(false, FD_RAW_NEED_DISK);
3858 process_fd_request();
3861 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3865 static const struct block_device_operations floppy_fops = {
3866 .owner = THIS_MODULE,
3867 .open = floppy_open,
3868 .release = floppy_release,
3870 .getgeo = fd_getgeo,
3871 .media_changed = check_floppy_change,
3872 .revalidate_disk = floppy_revalidate,
3876 * Floppy Driver initialization
3877 * =============================
3880 /* Determine the floppy disk controller type */
3881 /* This routine was written by David C. Niemi */
3882 static char __init get_fdc_version(void)
3886 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
3891 return FDC_NONE; /* No FDC present ??? */
3892 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3893 pr_info("FDC %d is an 8272A\n", fdc);
3894 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
3897 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3902 if (!fdc_configure()) {
3903 pr_info("FDC %d is an 82072\n", fdc);
3904 return FDC_82072; /* 82072 doesn't know CONFIGURE */
3907 output_byte(FD_PERPENDICULAR);
3908 if (need_more_output() == MORE_OUTPUT) {
3911 pr_info("FDC %d is an 82072A\n", fdc);
3912 return FDC_82072A; /* 82072A as found on Sparcs. */
3915 output_byte(FD_UNLOCK);
3917 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3918 pr_info("FDC %d is a pre-1991 82077\n", fdc);
3919 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
3922 if ((r != 1) || (reply_buffer[0] != 0x00)) {
3923 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3927 output_byte(FD_PARTID);
3930 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3934 if (reply_buffer[0] == 0x80) {
3935 pr_info("FDC %d is a post-1991 82077\n", fdc);
3936 return FDC_82077; /* Revised 82077AA passes all the tests */
3938 switch (reply_buffer[0] >> 5) {
3940 /* Either a 82078-1 or a 82078SL running at 5Volt */
3941 pr_info("FDC %d is an 82078.\n", fdc);
3944 pr_info("FDC %d is a 44pin 82078\n", fdc);
3947 pr_info("FDC %d is a S82078B\n", fdc);
3950 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
3953 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
3954 fdc, reply_buffer[0] >> 5);
3955 return FDC_82078_UNKN;
3957 } /* get_fdc_version */
3959 /* lilo configuration */
3961 static void __init floppy_set_flags(int *ints, int param, int param2)
3965 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3967 default_drive_params[i].params.flags |= param2;
3969 default_drive_params[i].params.flags &= ~param2;
3971 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
3974 static void __init daring(int *ints, int param, int param2)
3978 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
3980 default_drive_params[i].params.select_delay = 0;
3981 default_drive_params[i].params.flags |=
3982 FD_SILENT_DCL_CLEAR;
3984 default_drive_params[i].params.select_delay =
3986 default_drive_params[i].params.flags &=
3987 ~FD_SILENT_DCL_CLEAR;
3990 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3993 static void __init set_cmos(int *ints, int dummy, int dummy2)
3995 int current_drive = 0;
3998 DPRINT("wrong number of parameters for CMOS\n");
4001 current_drive = ints[1];
4002 if (current_drive < 0 || current_drive >= 8) {
4003 DPRINT("bad drive for set_cmos\n");
4007 if (current_drive >= 4 && !FDC2)
4011 DPRINT("setting CMOS code to %d\n", ints[2]);
4014 static struct param_table {
4016 void (*fn) (int *ints, int param, int param2);
4020 } config_params[] __initdata = {
4021 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4022 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4023 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4024 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4025 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4026 {"daring", daring, NULL, 1, 0},
4028 {"two_fdc", NULL, &FDC2, 0x370, 0},
4029 {"one_fdc", NULL, &FDC2, 0, 0},
4031 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4032 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4033 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4034 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4035 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4036 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4037 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4038 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4039 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4040 {"nofifo", NULL, &no_fifo, 0x20, 0},
4041 {"usefifo", NULL, &no_fifo, 0, 0},
4042 {"cmos", set_cmos, NULL, 0, 0},
4043 {"slow", NULL, &slow_floppy, 1, 0},
4044 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4045 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4046 {"L40SX", NULL, &print_unex, 0, 0}
4051 static int __init floppy_setup(char *str)
4057 str = get_options(str, ARRAY_SIZE(ints), ints);
4059 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4060 if (strcmp(str, config_params[i].name) == 0) {
4064 param = config_params[i].def_param;
4065 if (config_params[i].fn)
4066 config_params[i].fn(ints, param,
4069 if (config_params[i].var) {
4070 DPRINT("%s=%d\n", str, param);
4071 *config_params[i].var = param;
4078 DPRINT("unknown floppy option [%s]\n", str);
4080 DPRINT("allowed options are:");
4081 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4082 pr_cont(" %s", config_params[i].name);
4085 DPRINT("botched floppy option\n");
4086 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4090 static int have_no_fdc = -ENODEV;
4092 static ssize_t floppy_cmos_show(struct device *dev,
4093 struct device_attribute *attr, char *buf)
4095 struct platform_device *p = to_platform_device(dev);
4099 return sprintf(buf, "%X\n", UDP->cmos);
4102 static DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4104 static void floppy_device_release(struct device *dev)
4108 static int floppy_resume(struct device *dev)
4112 for (fdc = 0; fdc < N_FDC; fdc++)
4113 if (FDCS->address != -1)
4114 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4119 static const struct dev_pm_ops floppy_pm_ops = {
4120 .resume = floppy_resume,
4121 .restore = floppy_resume,
4124 static struct platform_driver floppy_driver = {
4127 .pm = &floppy_pm_ops,
4131 static struct platform_device floppy_device[N_DRIVE];
4133 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4135 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4136 if (drive >= N_DRIVE ||
4137 !(allowed_drive_mask & (1 << drive)) ||
4138 fdc_state[FDC(drive)].version == FDC_NONE)
4140 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4143 return get_disk(disks[drive]);
4146 static int __init floppy_init(void)
4152 interruptjiffies = resultjiffies = jiffies;
4154 #if defined(CONFIG_PPC)
4155 if (check_legacy_ioport(FDC1))
4161 for (dr = 0; dr < N_DRIVE; dr++) {
4162 disks[dr] = alloc_disk(1);
4168 disks[dr]->major = FLOPPY_MAJOR;
4169 disks[dr]->first_minor = TOMINOR(dr);
4170 disks[dr]->fops = &floppy_fops;
4171 sprintf(disks[dr]->disk_name, "fd%d", dr);
4173 init_timer(&motor_off_timer[dr]);
4174 motor_off_timer[dr].data = dr;
4175 motor_off_timer[dr].function = motor_off_callback;
4178 err = register_blkdev(FLOPPY_MAJOR, "fd");
4182 err = platform_driver_register(&floppy_driver);
4184 goto out_unreg_blkdev;
4186 floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
4187 if (!floppy_queue) {
4189 goto out_unreg_driver;
4191 blk_queue_max_hw_sectors(floppy_queue, 64);
4193 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4194 floppy_find, NULL, NULL);
4196 for (i = 0; i < 256; i++)
4198 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4200 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4202 reschedule_timeout(MAXTIMEOUT, "floppy init");
4205 for (i = 0; i < N_FDC; i++) {
4207 memset(FDCS, 0, sizeof(*FDCS));
4210 #if defined(__sparc__) || defined(__mc68000__)
4211 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4215 FDCS->version = FDC_82072A;
4219 use_virtual_dma = can_use_virtual_dma & 1;
4220 fdc_state[0].address = FDC1;
4221 if (fdc_state[0].address == -1) {
4222 del_timer(&fd_timeout);
4224 goto out_unreg_region;
4227 fdc_state[1].address = FDC2;
4230 fdc = 0; /* reset fdc in case of unexpected interrupt */
4231 err = floppy_grab_irq_and_dma();
4233 del_timer(&fd_timeout);
4235 goto out_unreg_region;
4238 /* initialise drive state */
4239 for (drive = 0; drive < N_DRIVE; drive++) {
4240 memset(UDRS, 0, sizeof(*UDRS));
4241 memset(UDRWE, 0, sizeof(*UDRWE));
4242 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4243 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4244 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4245 UDRS->fd_device = -1;
4246 floppy_track_buffer = NULL;
4247 max_buffer_sectors = 0;
4250 * Small 10 msec delay to let through any interrupt that
4251 * initialization might have triggered, to not
4252 * confuse detection:
4256 for (i = 0; i < N_FDC; i++) {
4258 FDCS->driver_version = FD_DRIVER_VERSION;
4259 for (unit = 0; unit < 4; unit++)
4260 FDCS->track[unit] = 0;
4261 if (FDCS->address == -1)
4264 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4265 /* free ioports reserved by floppy_grab_irq_and_dma() */
4266 floppy_release_regions(fdc);
4268 FDCS->version = FDC_NONE;
4271 /* Try to determine the floppy controller type */
4272 FDCS->version = get_fdc_version();
4273 if (FDCS->version == FDC_NONE) {
4274 /* free ioports reserved by floppy_grab_irq_and_dma() */
4275 floppy_release_regions(fdc);
4279 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4280 can_use_virtual_dma = 0;
4283 /* Not all FDCs seem to be able to handle the version command
4284 * properly, so force a reset for the standard FDC clones,
4285 * to avoid interrupt garbage.
4287 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4290 del_timer(&fd_timeout);
4294 DPRINT("no floppy controllers found\n");
4296 goto out_flush_work;
4299 for (drive = 0; drive < N_DRIVE; drive++) {
4300 if (!(allowed_drive_mask & (1 << drive)))
4302 if (fdc_state[FDC(drive)].version == FDC_NONE)
4305 floppy_device[drive].name = floppy_device_name;
4306 floppy_device[drive].id = drive;
4307 floppy_device[drive].dev.release = floppy_device_release;
4309 err = platform_device_register(&floppy_device[drive]);
4311 goto out_flush_work;
4313 err = device_create_file(&floppy_device[drive].dev,
4316 goto out_unreg_platform_dev;
4318 /* to be cleaned up... */
4319 disks[drive]->private_data = (void *)(long)drive;
4320 disks[drive]->queue = floppy_queue;
4321 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4322 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4323 add_disk(disks[drive]);
4328 out_unreg_platform_dev:
4329 platform_device_unregister(&floppy_device[drive]);
4331 flush_scheduled_work();
4332 if (atomic_read(&usage_count))
4333 floppy_release_irq_and_dma();
4335 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4336 blk_cleanup_queue(floppy_queue);
4338 platform_driver_unregister(&floppy_driver);
4340 unregister_blkdev(FLOPPY_MAJOR, "fd");
4343 del_timer(&motor_off_timer[dr]);
4344 put_disk(disks[dr]);
4349 static const struct io_region {
4354 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4356 /* address + 6 is reserved, and may be taken by IDE.
4357 * Unfortunately, Adaptec doesn't know this :-(, */
4361 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4363 while (p != io_regions) {
4365 release_region(FDCS->address + p->offset, p->size);
4369 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4371 static int floppy_request_regions(int fdc)
4373 const struct io_region *p;
4375 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4376 if (!request_region(FDCS->address + p->offset,
4377 p->size, "floppy")) {
4378 DPRINT("Floppy io-port 0x%04lx in use\n",
4379 FDCS->address + p->offset);
4380 floppy_release_allocated_regions(fdc, p);
4387 static void floppy_release_regions(int fdc)
4389 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4392 static int floppy_grab_irq_and_dma(void)
4394 if (atomic_inc_return(&usage_count) > 1)
4398 * We might have scheduled a free_irq(), wait it to
4401 flush_scheduled_work();
4403 if (fd_request_irq()) {
4404 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4406 atomic_dec(&usage_count);
4409 if (fd_request_dma()) {
4410 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4412 if (can_use_virtual_dma & 2)
4413 use_virtual_dma = can_use_virtual_dma = 1;
4414 if (!(can_use_virtual_dma & 1)) {
4416 atomic_dec(&usage_count);
4421 for (fdc = 0; fdc < N_FDC; fdc++) {
4422 if (FDCS->address != -1) {
4423 if (floppy_request_regions(fdc))
4427 for (fdc = 0; fdc < N_FDC; fdc++) {
4428 if (FDCS->address != -1) {
4430 fd_outb(FDCS->dor, FD_DOR);
4434 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4436 for (fdc = 0; fdc < N_FDC; fdc++)
4437 if (FDCS->address != -1)
4438 fd_outb(FDCS->dor, FD_DOR);
4440 * The driver will try and free resources and relies on us
4441 * to know if they were allocated or not.
4444 irqdma_allocated = 1;
4450 floppy_release_regions(fdc);
4451 atomic_dec(&usage_count);
4455 static void floppy_release_irq_and_dma(void)
4462 unsigned long tmpaddr;
4464 if (!atomic_dec_and_test(&usage_count))
4467 if (irqdma_allocated) {
4471 irqdma_allocated = 0;
4477 floppy_enable_hlt();
4479 if (floppy_track_buffer && max_buffer_sectors) {
4480 tmpsize = max_buffer_sectors * 1024;
4481 tmpaddr = (unsigned long)floppy_track_buffer;
4482 floppy_track_buffer = NULL;
4483 max_buffer_sectors = 0;
4484 buffer_min = buffer_max = -1;
4485 fd_dma_mem_free(tmpaddr, tmpsize);
4488 for (drive = 0; drive < N_FDC * 4; drive++)
4489 if (timer_pending(motor_off_timer + drive))
4490 pr_info("motor off timer %d still active\n", drive);
4493 if (timer_pending(&fd_timeout))
4494 pr_info("floppy timer still active:%s\n", timeout_message);
4495 if (timer_pending(&fd_timer))
4496 pr_info("auxiliary floppy timer still active\n");
4497 if (work_pending(&floppy_work))
4498 pr_info("work still pending\n");
4500 for (fdc = 0; fdc < N_FDC; fdc++)
4501 if (FDCS->address != -1)
4502 floppy_release_regions(fdc);
4508 static char *floppy;
4510 static void __init parse_floppy_cfg_string(char *cfg)
4516 while (*cfg && *cfg != ' ' && *cfg != '\t')
4527 static int __init floppy_module_init(void)
4530 parse_floppy_cfg_string(floppy);
4531 return floppy_init();
4533 module_init(floppy_module_init);
4535 static void __exit floppy_module_exit(void)
4539 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4540 unregister_blkdev(FLOPPY_MAJOR, "fd");
4541 platform_driver_unregister(&floppy_driver);
4543 for (drive = 0; drive < N_DRIVE; drive++) {
4544 del_timer_sync(&motor_off_timer[drive]);
4546 if ((allowed_drive_mask & (1 << drive)) &&
4547 fdc_state[FDC(drive)].version != FDC_NONE) {
4548 del_gendisk(disks[drive]);
4549 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4550 platform_device_unregister(&floppy_device[drive]);
4552 put_disk(disks[drive]);
4555 del_timer_sync(&fd_timeout);
4556 del_timer_sync(&fd_timer);
4557 blk_cleanup_queue(floppy_queue);
4559 if (atomic_read(&usage_count))
4560 floppy_release_irq_and_dma();
4562 /* eject disk, if any */
4566 module_exit(floppy_module_exit);
4568 module_param(floppy, charp, 0);
4569 module_param(FLOPPY_IRQ, int, 0);
4570 module_param(FLOPPY_DMA, int, 0);
4571 MODULE_AUTHOR("Alain L. Knaff");
4572 MODULE_SUPPORTED_DEVICE("fd");
4573 MODULE_LICENSE("GPL");
4575 /* This doesn't actually get used other than for module information */
4576 static const struct pnp_device_id floppy_pnpids[] = {
4581 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4585 __setup("floppy=", floppy_setup);
4586 module_init(floppy_init)
4589 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);