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 #define FLOPPY_SANITY_CHECK
148 #undef FLOPPY_SILENT_DCL_CLEAR
150 #define REALLY_SLOW_IO
153 #define DCL_DEBUG /* debug disk change line */
155 /* do print messages for unexpected interrupts */
156 static int print_unex = 1;
157 #include <linux/module.h>
158 #include <linux/sched.h>
159 #include <linux/fs.h>
160 #include <linux/kernel.h>
161 #include <linux/timer.h>
162 #include <linux/workqueue.h>
164 #include <linux/fdreg.h>
165 #include <linux/fd.h>
166 #include <linux/hdreg.h>
167 #include <linux/errno.h>
168 #include <linux/slab.h>
169 #include <linux/mm.h>
170 #include <linux/bio.h>
171 #include <linux/string.h>
172 #include <linux/jiffies.h>
173 #include <linux/fcntl.h>
174 #include <linux/delay.h>
175 #include <linux/mc146818rtc.h> /* CMOS defines */
176 #include <linux/ioport.h>
177 #include <linux/interrupt.h>
178 #include <linux/init.h>
179 #include <linux/platform_device.h>
180 #include <linux/mod_devicetable.h>
181 #include <linux/buffer_head.h> /* for invalidate_buffers() */
182 #include <linux/mutex.h>
183 #include <linux/io.h>
184 #include <linux/uaccess.h>
187 * PS/2 floppies have much slower step rates than regular floppies.
188 * It's been recommended that take about 1/4 of the default speed
189 * in some more extreme cases.
191 static int slow_floppy;
195 #include <asm/system.h>
197 static int FLOPPY_IRQ = 6;
198 static int FLOPPY_DMA = 2;
199 static int can_use_virtual_dma = 2;
201 * can use virtual DMA:
202 * 0 = use of virtual DMA disallowed by config
203 * 1 = use of virtual DMA prescribed by config
204 * 2 = no virtual DMA preference configured. By default try hard DMA,
205 * but fall back on virtual DMA when not enough memory available
208 static int use_virtual_dma;
212 * 1 using virtual DMA
213 * This variable is set to virtual when a DMA mem problem arises, and
214 * reset back in floppy_grab_irq_and_dma.
215 * It is not safe to reset it in other circumstances, because the floppy
216 * driver may have several buffers in use at once, and we do currently not
217 * record each buffers capabilities
220 static DEFINE_SPINLOCK(floppy_lock);
222 static unsigned short virtual_dma_port = 0x3f0;
223 irqreturn_t floppy_interrupt(int irq, void *dev_id);
224 static int set_dor(int fdc, char mask, char data);
226 #define K_64 0x10000 /* 64KB */
228 /* the following is the mask of allowed drives. By default units 2 and
229 * 3 of both floppy controllers are disabled, because switching on the
230 * motor of these drives causes system hangs on some PCI computers. drive
231 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
232 * a drive is allowed.
234 * NOTE: This must come before we include the arch floppy header because
235 * some ports reference this variable from there. -DaveM
238 static int allowed_drive_mask = 0x33;
240 #include <asm/floppy.h>
242 static int irqdma_allocated;
244 #define DEVICE_NAME "floppy"
246 #include <linux/blkdev.h>
247 #include <linux/blkpg.h>
248 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
249 #include <linux/completion.h>
251 static struct request *current_req;
252 static struct request_queue *floppy_queue;
253 static void do_fd_request(struct request_queue *q);
255 #ifndef fd_get_dma_residue
256 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
259 /* Dma Memory related stuff */
261 #ifndef fd_dma_mem_free
262 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
265 #ifndef fd_dma_mem_alloc
266 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
269 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
271 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
273 return; /* we have the memory */
274 if (can_use_virtual_dma != 2)
275 return; /* no fallback allowed */
276 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
277 *addr = (char *)nodma_mem_alloc(l);
283 /* End dma memory related stuff */
285 static unsigned long fake_change;
286 static int initialising = 1;
288 #define ITYPE(x) (((x) >> 2) & 0x1f)
289 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
290 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
291 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
292 /* reverse mapping from unit and fdc to drive */
293 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
295 #define DP (&drive_params[current_drive])
296 #define DRS (&drive_state[current_drive])
297 #define DRWE (&write_errors[current_drive])
298 #define FDCS (&fdc_state[fdc])
299 #define CLEARF(x) clear_bit(x##_BIT, &DRS->flags)
300 #define SETF(x) set_bit(x##_BIT, &DRS->flags)
301 #define TESTF(x) test_bit(x##_BIT, &DRS->flags)
303 #define UDP (&drive_params[drive])
304 #define UDRS (&drive_state[drive])
305 #define UDRWE (&write_errors[drive])
306 #define UFDCS (&fdc_state[FDC(drive)])
307 #define UCLEARF(x) clear_bit(x##_BIT, &UDRS->flags)
308 #define USETF(x) set_bit(x##_BIT, &UDRS->flags)
309 #define UTESTF(x) test_bit(x##_BIT, &UDRS->flags)
311 #define DPRINT(format, args...) \
312 pr_info(DEVICE_NAME "%d: " format, current_drive, ##args)
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 #define NO_SIGNAL (!interruptible || !signal_pending(current))
519 #define CALL(x) if ((x) == -EINTR) return -EINTR
520 #define ECALL(x) if ((ret = (x))) return ret;
521 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
522 #define WAIT(x) _WAIT((x),interruptible)
523 #define IWAIT(x) _WAIT((x),1)
525 /* Errors during formatting are counted here. */
526 static int format_errors;
528 /* Format request descriptor. */
529 static struct format_descr format_req;
532 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
533 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
534 * H is head unload time (1=16ms, 2=32ms, etc)
539 * Because these are written to by the DMA controller, they must
540 * not contain a 64k byte boundary crossing, or data will be
543 static char *floppy_track_buffer;
544 static int max_buffer_sectors;
547 typedef void (*done_f)(int);
548 static struct cont_t {
549 void (*interrupt)(void);
550 /* this is called after the interrupt of the
552 void (*redo)(void); /* this is called to retry the operation */
553 void (*error)(void); /* this is called to tally an error */
554 done_f done; /* this is called to say if the operation has
555 * succeeded/failed */
558 static void floppy_ready(void);
559 static void floppy_start(void);
560 static void process_fd_request(void);
561 static void recalibrate_floppy(void);
562 static void floppy_shutdown(unsigned long);
564 static int floppy_request_regions(int);
565 static void floppy_release_regions(int);
566 static int floppy_grab_irq_and_dma(void);
567 static void floppy_release_irq_and_dma(void);
570 * The "reset" variable should be tested whenever an interrupt is scheduled,
571 * after the commands have been sent. This is to ensure that the driver doesn't
572 * get wedged when the interrupt doesn't come because of a failed command.
573 * reset doesn't need to be tested before sending commands, because
574 * output_byte is automatically disabled when reset is set.
576 static void reset_fdc(void);
579 * These are global variables, as that's the easiest way to give
580 * information to interrupts. They are the data used for the current
584 #define NEED_1_RECAL -2
585 #define NEED_2_RECAL -3
587 static int usage_count;
589 /* buffer related variables */
590 static int buffer_track = -1;
591 static int buffer_drive = -1;
592 static int buffer_min = -1;
593 static int buffer_max = -1;
595 /* fdc related variables, should end up in a struct */
596 static struct floppy_fdc_state fdc_state[N_FDC];
597 static int fdc; /* current fdc */
599 static struct floppy_struct *_floppy = floppy_type;
600 static unsigned char current_drive;
601 static long current_count_sectors;
602 static unsigned char fsector_t; /* sector in track */
603 static unsigned char in_sector_offset; /* offset within physical sector,
604 * expressed in units of 512 bytes */
607 static inline int fd_eject(int drive)
618 static long unsigned debugtimer;
620 static inline void set_debugt(void)
622 debugtimer = jiffies;
625 static inline void debugt(const char *message)
627 if (DP->flags & DEBUGT)
628 pr_info("%s dtime=%lu\n", message, jiffies - debugtimer);
631 static inline void set_debugt(void) { }
632 static inline void debugt(const char *message) { }
635 typedef void (*timeout_fn)(unsigned long);
636 static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
638 static const char *timeout_message;
640 #ifdef FLOPPY_SANITY_CHECK
641 static void is_alive(const char *message)
643 /* this routine checks whether the floppy driver is "alive" */
644 if (test_bit(0, &fdc_busy) && command_status < 2
645 && !timer_pending(&fd_timeout)) {
646 DPRINT("timeout handler died: %s\n", message);
651 static void (*do_floppy)(void) = NULL;
653 #ifdef FLOPPY_SANITY_CHECK
657 static void (*lasthandler)(void);
658 static unsigned long interruptjiffies;
659 static unsigned long resultjiffies;
660 static int resultsize;
661 static unsigned long lastredo;
663 static struct output_log {
665 unsigned char status;
666 unsigned long jiffies;
667 } output_log[OLOGSIZE];
669 static int output_log_pos;
672 #define current_reqD -1
673 #define MAXTIMEOUT -2
675 static void __reschedule_timeout(int drive, const char *message, int marg)
677 if (drive == current_reqD)
678 drive = current_drive;
679 del_timer(&fd_timeout);
680 if (drive < 0 || drive >= N_DRIVE) {
681 fd_timeout.expires = jiffies + 20UL * HZ;
684 fd_timeout.expires = jiffies + UDP->timeout;
685 add_timer(&fd_timeout);
686 if (UDP->flags & FD_DEBUG)
687 DPRINT("reschedule timeout %s %d\n", message, marg);
688 timeout_message = message;
691 static void reschedule_timeout(int drive, const char *message, int marg)
695 spin_lock_irqsave(&floppy_lock, flags);
696 __reschedule_timeout(drive, message, marg);
697 spin_unlock_irqrestore(&floppy_lock, flags);
700 #define INFBOUND(a, b) (a) = max_t(int, a, b)
701 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
704 * Bottom half floppy driver.
705 * ==========================
707 * This part of the file contains the code talking directly to the hardware,
708 * and also the main service loop (seek-configure-spinup-command)
713 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
714 * and the last_checked date.
716 * last_checked is the date of the last check which showed 'no disk change'
717 * FD_DISK_CHANGE is set under two conditions:
718 * 1. The floppy has been changed after some i/o to that floppy already
720 * 2. No floppy disk is in the drive. This is done in order to ensure that
721 * requests are quickly flushed in case there is no disk in the drive. It
722 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
725 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
726 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
727 * each seek. If a disk is present, the disk change line should also be
728 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
729 * change line is set, this means either that no disk is in the drive, or
730 * that it has been removed since the last seek.
732 * This means that we really have a third possibility too:
733 * The floppy has been changed after the last seek.
736 static int disk_change(int drive)
738 int fdc = FDC(drive);
740 #ifdef FLOPPY_SANITY_CHECK
741 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
742 DPRINT("WARNING disk change called early\n");
743 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
744 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
745 DPRINT("probing disk change on unselected drive\n");
746 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
747 (unsigned int)FDCS->dor);
752 if (UDP->flags & FD_DEBUG) {
753 DPRINT("checking disk change line for drive %d\n", drive);
754 DPRINT("jiffies=%lu\n", jiffies);
755 DPRINT("disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
756 DPRINT("flags=%lx\n", UDRS->flags);
759 if (UDP->flags & FD_BROKEN_DCL)
760 return UTESTF(FD_DISK_CHANGED);
761 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
762 USETF(FD_VERIFY); /* verify write protection */
763 if (UDRS->maxblock) {
764 /* mark it changed */
765 USETF(FD_DISK_CHANGED);
768 /* invalidate its geometry */
769 if (UDRS->keep_data >= 0) {
770 if ((UDP->flags & FTD_MSG) &&
771 current_type[drive] != NULL)
772 DPRINT("Disk type is undefined after "
774 current_type[drive] = NULL;
775 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
780 UDRS->last_checked = jiffies;
781 UCLEARF(FD_DISK_NEWCHANGE);
786 static inline int is_selected(int dor, int unit)
788 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
791 static int set_dor(int fdc, char mask, char data)
795 unsigned char newdor;
796 unsigned char olddor;
798 if (FDCS->address == -1)
802 newdor = (olddor & mask) | data;
803 if (newdor != olddor) {
805 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
806 drive = REVDRIVE(fdc, unit);
808 if (UDP->flags & FD_DEBUG)
809 DPRINT("calling disk change from set_dor\n");
814 fd_outb(newdor, FD_DOR);
817 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
818 drive = REVDRIVE(fdc, unit);
819 UDRS->select_date = jiffies;
825 static void twaddle(void)
827 if (DP->select_delay)
829 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
830 fd_outb(FDCS->dor, FD_DOR);
831 DRS->select_date = jiffies;
834 /* reset all driver information about the current fdc. This is needed after
835 * a reset, and after a raw command. */
836 static void reset_fdc_info(int mode)
840 FDCS->spec1 = FDCS->spec2 = -1;
841 FDCS->need_configure = 1;
844 for (drive = 0; drive < N_DRIVE; drive++)
845 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
846 UDRS->track = NEED_2_RECAL;
849 /* selects the fdc and drive, and enables the fdc's input/dma. */
850 static void set_fdc(int drive)
852 if (drive >= 0 && drive < N_DRIVE) {
854 current_drive = drive;
856 if (fdc != 1 && fdc != 0) {
857 pr_info("bad fdc value\n");
862 set_dor(1 - fdc, ~8, 0);
864 if (FDCS->rawcmd == 2)
866 if (fd_inb(FD_STATUS) != STATUS_READY)
870 /* locks the driver */
871 static int _lock_fdc(int drive, int interruptible, int line)
874 pr_err("Trying to lock fdc while usage count=0 at line %d\n",
879 if (test_and_set_bit(0, &fdc_busy)) {
880 DECLARE_WAITQUEUE(wait, current);
881 add_wait_queue(&fdc_wait, &wait);
884 set_current_state(TASK_INTERRUPTIBLE);
886 if (!test_and_set_bit(0, &fdc_busy))
892 remove_wait_queue(&fdc_wait, &wait);
897 set_current_state(TASK_RUNNING);
898 remove_wait_queue(&fdc_wait, &wait);
899 flush_scheduled_work();
901 command_status = FD_COMMAND_NONE;
903 __reschedule_timeout(drive, "lock fdc", 0);
908 #define lock_fdc(drive, interruptible) \
909 _lock_fdc(drive, interruptible, __LINE__)
911 /* unlocks the driver */
912 static inline void unlock_fdc(void)
917 if (!test_bit(0, &fdc_busy))
918 DPRINT("FDC access conflict!\n");
921 DPRINT("device interrupt still active at FDC release: %p!\n",
923 command_status = FD_COMMAND_NONE;
924 spin_lock_irqsave(&floppy_lock, flags);
925 del_timer(&fd_timeout);
927 clear_bit(0, &fdc_busy);
928 if (current_req || blk_peek_request(floppy_queue))
929 do_fd_request(floppy_queue);
930 spin_unlock_irqrestore(&floppy_lock, flags);
934 /* switches the motor off after a given timeout */
935 static void motor_off_callback(unsigned long nr)
937 unsigned char mask = ~(0x10 << UNIT(nr));
939 set_dor(FDC(nr), mask, 0);
942 /* schedules motor off */
943 static void floppy_off(unsigned int drive)
945 unsigned long volatile delta;
946 int fdc = FDC(drive);
948 if (!(FDCS->dor & (0x10 << UNIT(drive))))
951 del_timer(motor_off_timer + drive);
953 /* make spindle stop in a position which minimizes spinup time
956 delta = jiffies - UDRS->first_read_date + HZ -
957 UDP->spindown_offset;
958 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
959 motor_off_timer[drive].expires =
960 jiffies + UDP->spindown - delta;
962 add_timer(motor_off_timer + drive);
966 * cycle through all N_DRIVE floppy drives, for disk change testing.
967 * stopping at current drive. This is done before any long operation, to
968 * be sure to have up to date disk change information.
970 static void scandrives(void)
976 if (DP->select_delay)
979 saved_drive = current_drive;
980 for (i = 0; i < N_DRIVE; i++) {
981 drive = (saved_drive + i + 1) % N_DRIVE;
982 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
983 continue; /* skip closed drives */
985 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
986 (0x10 << UNIT(drive))))
987 /* switch the motor off again, if it was off to
989 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
991 set_fdc(saved_drive);
994 static void empty(void)
998 static DECLARE_WORK(floppy_work, NULL);
1000 static void schedule_bh(void (*handler)(void))
1002 PREPARE_WORK(&floppy_work, (work_func_t)handler);
1003 schedule_work(&floppy_work);
1006 static DEFINE_TIMER(fd_timer, NULL, 0, 0);
1008 static void cancel_activity(void)
1010 unsigned long flags;
1012 spin_lock_irqsave(&floppy_lock, flags);
1014 PREPARE_WORK(&floppy_work, (work_func_t)empty);
1015 del_timer(&fd_timer);
1016 spin_unlock_irqrestore(&floppy_lock, flags);
1019 /* this function makes sure that the disk stays in the drive during the
1021 static void fd_watchdog(void)
1024 if (DP->flags & FD_DEBUG)
1025 DPRINT("calling disk change from watchdog\n");
1028 if (disk_change(current_drive)) {
1029 DPRINT("disk removed during i/o\n");
1034 del_timer(&fd_timer);
1035 fd_timer.function = (timeout_fn)fd_watchdog;
1036 fd_timer.expires = jiffies + HZ / 10;
1037 add_timer(&fd_timer);
1041 static void main_command_interrupt(void)
1043 del_timer(&fd_timer);
1047 /* waits for a delay (spinup or select) to pass */
1048 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1051 reset_fdc(); /* do the reset during sleep to win time
1052 * if we don't need to sleep, it's a good
1053 * occasion anyways */
1057 if (time_before(jiffies, delay)) {
1058 del_timer(&fd_timer);
1059 fd_timer.function = function;
1060 fd_timer.expires = delay;
1061 add_timer(&fd_timer);
1067 static DEFINE_SPINLOCK(floppy_hlt_lock);
1068 static int hlt_disabled;
1069 static void floppy_disable_hlt(void)
1071 unsigned long flags;
1073 spin_lock_irqsave(&floppy_hlt_lock, flags);
1074 if (!hlt_disabled) {
1076 #ifdef HAVE_DISABLE_HLT
1080 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1083 static void floppy_enable_hlt(void)
1085 unsigned long flags;
1087 spin_lock_irqsave(&floppy_hlt_lock, flags);
1090 #ifdef HAVE_DISABLE_HLT
1094 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1097 static void setup_DMA(void)
1101 #ifdef FLOPPY_SANITY_CHECK
1102 if (raw_cmd->length == 0) {
1105 pr_info("zero dma transfer size:");
1106 for (i = 0; i < raw_cmd->cmd_count; i++)
1107 pr_cont("%x,", raw_cmd->cmd[i]);
1113 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1114 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1120 f = claim_dma_lock();
1123 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1124 (raw_cmd->flags & FD_RAW_READ) ?
1125 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1126 release_dma_lock(f);
1131 release_dma_lock(f);
1134 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1135 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1136 DMA_MODE_READ : DMA_MODE_WRITE);
1137 fd_set_dma_addr(raw_cmd->kernel_data);
1138 fd_set_dma_count(raw_cmd->length);
1139 virtual_dma_port = FDCS->address;
1141 release_dma_lock(f);
1143 floppy_disable_hlt();
1146 static void show_floppy(void);
1148 /* waits until the fdc becomes ready */
1149 static int wait_til_ready(void)
1156 for (counter = 0; counter < 10000; counter++) {
1157 status = fd_inb(FD_STATUS);
1158 if (status & STATUS_READY)
1161 if (!initialising) {
1162 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1169 /* sends a command byte to the fdc */
1170 static int output_byte(char byte)
1172 int status = wait_til_ready();
1176 if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY) {
1177 fd_outb(byte, FD_DATA);
1178 #ifdef FLOPPY_SANITY_CHECK
1179 output_log[output_log_pos].data = byte;
1180 output_log[output_log_pos].status = status;
1181 output_log[output_log_pos].jiffies = jiffies;
1182 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1187 if (!initialising) {
1188 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1195 /* gets the response from the fdc */
1196 static int result(void)
1201 for (i = 0; i < MAX_REPLIES; i++) {
1202 status = wait_til_ready();
1205 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1206 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1207 #ifdef FLOPPY_SANITY_CHECK
1208 resultjiffies = jiffies;
1213 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1214 reply_buffer[i] = fd_inb(FD_DATA);
1218 if (!initialising) {
1220 ("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1228 #define MORE_OUTPUT -2
1229 /* does the fdc need more output? */
1230 static int need_more_output(void)
1232 int status = wait_til_ready();
1236 if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY)
1241 /* Set perpendicular mode as required, based on data rate, if supported.
1242 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1244 static inline void perpendicular_mode(void)
1246 unsigned char perp_mode;
1248 if (raw_cmd->rate & 0x40) {
1249 switch (raw_cmd->rate & 3) {
1257 DPRINT("Invalid data rate for perpendicular mode!\n");
1261 * convenient way to return to
1262 * redo without too much hassle
1263 * (deep stack et al.)
1270 if (FDCS->perp_mode == perp_mode)
1272 if (FDCS->version >= FDC_82077_ORIG) {
1273 output_byte(FD_PERPENDICULAR);
1274 output_byte(perp_mode);
1275 FDCS->perp_mode = perp_mode;
1276 } else if (perp_mode) {
1277 DPRINT("perpendicular mode not supported by this FDC.\n");
1279 } /* perpendicular_mode */
1281 static int fifo_depth = 0xa;
1284 static int fdc_configure(void)
1287 output_byte(FD_CONFIGURE);
1288 if (need_more_output() != MORE_OUTPUT)
1291 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1292 output_byte(0); /* pre-compensation from track
1297 #define NOMINAL_DTR 500
1299 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1300 * head load time, and DMA disable flag to values needed by floppy.
1302 * The value "dtr" is the data transfer rate in Kbps. It is needed
1303 * to account for the data rate-based scaling done by the 82072 and 82077
1304 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1307 * Note that changing the data transfer rate has a (probably deleterious)
1308 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1309 * fdc_specify is called again after each data transfer rate
1312 * srt: 1000 to 16000 in microseconds
1313 * hut: 16 to 240 milliseconds
1314 * hlt: 2 to 254 milliseconds
1316 * These values are rounded up to the next highest available delay time.
1318 static void fdc_specify(void)
1320 unsigned char spec1;
1321 unsigned char spec2;
1325 unsigned long dtr = NOMINAL_DTR;
1326 unsigned long scale_dtr = NOMINAL_DTR;
1327 int hlt_max_code = 0x7f;
1328 int hut_max_code = 0xf;
1330 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1332 FDCS->need_configure = 0;
1335 switch (raw_cmd->rate & 0x03) {
1341 if (FDCS->version >= FDC_82078) {
1342 /* chose the default rate table, not the one
1343 * where 1 = 2 Mbps */
1344 output_byte(FD_DRIVESPEC);
1345 if (need_more_output() == MORE_OUTPUT) {
1346 output_byte(UNIT(current_drive));
1356 if (FDCS->version >= FDC_82072) {
1358 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1359 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1362 /* Convert step rate from microseconds to milliseconds and 4 bits */
1363 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1370 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1373 else if (hlt > 0x7f)
1376 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1382 spec1 = (srt << 4) | hut;
1383 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1385 /* If these parameters did not change, just return with success */
1386 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1387 /* Go ahead and set spec1 and spec2 */
1388 output_byte(FD_SPECIFY);
1389 output_byte(FDCS->spec1 = spec1);
1390 output_byte(FDCS->spec2 = spec2);
1394 /* Set the FDC's data transfer rate on behalf of the specified drive.
1395 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1396 * of the specify command (i.e. using the fdc_specify function).
1398 static int fdc_dtr(void)
1400 /* If data rate not already set to desired value, set it. */
1401 if ((raw_cmd->rate & 3) == FDCS->dtr)
1405 fd_outb(raw_cmd->rate & 3, FD_DCR);
1407 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1408 * need a stabilization period of several milliseconds to be
1409 * enforced after data rate changes before R/W operations.
1410 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1412 FDCS->dtr = raw_cmd->rate & 3;
1413 return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1414 (timeout_fn)floppy_ready);
1417 static void tell_sector(void)
1419 pr_cont(": track %d, head %d, sector %d, size %d",
1420 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1423 static void print_errors(void)
1426 if (ST0 & ST0_ECE) {
1427 pr_cont("Recalibrate failed!");
1428 } else if (ST2 & ST2_CRC) {
1429 pr_cont("data CRC error");
1431 } else if (ST1 & ST1_CRC) {
1432 pr_cont("CRC error");
1434 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1437 pr_cont("sector not found");
1440 pr_cont("probe failed...");
1441 } else if (ST2 & ST2_WC) { /* seek error */
1442 pr_cont("wrong cylinder");
1443 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1444 pr_cont("bad cylinder");
1446 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1454 * OK, this error interpreting routine is called after a
1455 * DMA read/write has succeeded
1456 * or failed, so we check the results, and copy any buffers.
1457 * hhb: Added better error reporting.
1458 * ak: Made this into a separate routine.
1460 static int interpret_errors(void)
1465 DPRINT("-- FDC reply error");
1470 /* check IC to find cause of interrupt */
1471 switch (ST0 & ST0_INTR) {
1472 case 0x40: /* error occurred during command execution */
1474 return 0; /* occurs with pseudo-DMA */
1477 DPRINT("Drive is write protected\n");
1478 CLEARF(FD_DISK_WRITABLE);
1481 } else if (ST1 & ST1_ND) {
1482 SETF(FD_NEED_TWADDLE);
1483 } else if (ST1 & ST1_OR) {
1484 if (DP->flags & FTD_MSG)
1485 DPRINT("Over/Underrun - retrying\n");
1487 } else if (*errors >= DP->max_errors.reporting) {
1490 if (ST2 & ST2_WC || ST2 & ST2_BC)
1491 /* wrong cylinder => recal */
1492 DRS->track = NEED_2_RECAL;
1494 case 0x80: /* invalid command given */
1495 DPRINT("Invalid FDC command given!\n");
1499 DPRINT("Abnormal termination caused by polling\n");
1502 default: /* (0) Normal command termination */
1508 * This routine is called when everything should be correctly set up
1509 * for the transfer (i.e. floppy motor is on, the correct floppy is
1510 * selected, and the head is sitting on the right track).
1512 static void setup_rw_floppy(void)
1518 unsigned long ready_date;
1519 timeout_fn function;
1521 flags = raw_cmd->flags;
1522 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1523 flags |= FD_RAW_INTR;
1525 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1526 ready_date = DRS->spinup_date + DP->spinup;
1527 /* If spinup will take a long time, rerun scandrives
1528 * again just before spinup completion. Beware that
1529 * after scandrives, we must again wait for selection.
1531 if (time_after(ready_date, jiffies + DP->select_delay)) {
1532 ready_date -= DP->select_delay;
1533 function = (timeout_fn)floppy_start;
1535 function = (timeout_fn)setup_rw_floppy;
1537 /* wait until the floppy is spinning fast enough */
1538 if (fd_wait_for_completion(ready_date, function))
1541 dflags = DRS->flags;
1543 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1546 if (flags & FD_RAW_INTR)
1547 do_floppy = main_command_interrupt;
1550 for (i = 0; i < raw_cmd->cmd_count; i++)
1551 r |= output_byte(raw_cmd->cmd[i]);
1553 debugt("rw_command: ");
1561 if (!(flags & FD_RAW_INTR)) {
1564 } else if (flags & FD_RAW_NEED_DISK)
1568 static int blind_seek;
1571 * This is the routine called after every seek (or recalibrate) interrupt
1572 * from the floppy controller.
1574 static void seek_interrupt(void)
1576 debugt("seek interrupt:");
1577 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1578 DPRINT("seek failed\n");
1579 DRS->track = NEED_2_RECAL;
1584 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1586 if (DP->flags & FD_DEBUG) {
1587 DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1588 DPRINT("jiffies=%lu\n", jiffies);
1591 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1592 DRS->select_date = jiffies;
1598 static void check_wp(void)
1600 if (TESTF(FD_VERIFY)) {
1601 /* check write protection */
1602 output_byte(FD_GETSTATUS);
1603 output_byte(UNIT(current_drive));
1604 if (result() != 1) {
1609 CLEARF(FD_NEED_TWADDLE);
1611 if (DP->flags & FD_DEBUG) {
1612 DPRINT("checking whether disk is write protected\n");
1613 DPRINT("wp=%x\n", ST3 & 0x40);
1617 SETF(FD_DISK_WRITABLE);
1619 CLEARF(FD_DISK_WRITABLE);
1623 static void seek_floppy(void)
1630 if (DP->flags & FD_DEBUG)
1631 DPRINT("calling disk change from seek\n");
1634 if (!TESTF(FD_DISK_NEWCHANGE) &&
1635 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1636 /* the media changed flag should be cleared after the seek.
1637 * If it isn't, this means that there is really no disk in
1640 SETF(FD_DISK_CHANGED);
1645 if (DRS->track <= NEED_1_RECAL) {
1646 recalibrate_floppy();
1648 } else if (TESTF(FD_DISK_NEWCHANGE) &&
1649 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1650 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1651 /* we seek to clear the media-changed condition. Does anybody
1652 * know a more elegant way, which works on all drives? */
1654 track = raw_cmd->track - 1;
1656 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1657 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1659 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1665 if (raw_cmd->track != DRS->track &&
1666 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1667 track = raw_cmd->track;
1674 do_floppy = seek_interrupt;
1675 output_byte(FD_SEEK);
1676 output_byte(UNIT(current_drive));
1677 if (output_byte(track) < 0) {
1681 debugt("seek command:");
1684 static void recal_interrupt(void)
1686 debugt("recal interrupt:");
1689 else if (ST0 & ST0_ECE) {
1690 switch (DRS->track) {
1692 debugt("recal interrupt need 1 recal:");
1693 /* after a second recalibrate, we still haven't
1694 * reached track 0. Probably no drive. Raise an
1695 * error, as failing immediately might upset
1696 * computers possessed by the Devil :-) */
1701 debugt("recal interrupt need 2 recal:");
1702 /* If we already did a recalibrate,
1703 * and we are not at track 0, this
1704 * means we have moved. (The only way
1705 * not to move at recalibration is to
1706 * be already at track 0.) Clear the
1707 * new change flag */
1709 if (DP->flags & FD_DEBUG)
1710 DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1713 CLEARF(FD_DISK_NEWCHANGE);
1714 DRS->select_date = jiffies;
1717 debugt("recal interrupt default:");
1718 /* Recalibrate moves the head by at
1719 * most 80 steps. If after one
1720 * recalibrate we don't have reached
1721 * track 0, this might mean that we
1722 * started beyond track 80. Try
1724 DRS->track = NEED_1_RECAL;
1732 static void print_result(char *message, int inr)
1736 DPRINT("%s ", message);
1738 for (i = 0; i < inr; i++)
1739 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1743 /* interrupt handler. Note that this can be called externally on the Sparc */
1744 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1748 void (*handler)(void) = do_floppy;
1750 lasthandler = handler;
1751 interruptjiffies = jiffies;
1753 f = claim_dma_lock();
1755 release_dma_lock(f);
1757 floppy_enable_hlt();
1759 if (fdc >= N_FDC || FDCS->address == -1) {
1760 /* we don't even know which FDC is the culprit */
1761 pr_info("DOR0=%x\n", fdc_state[0].dor);
1762 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1763 pr_info("handler=%p\n", handler);
1764 is_alive("bizarre fdc");
1769 /* We have to clear the reset flag here, because apparently on boxes
1770 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1771 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1772 * emission of the SENSEI's.
1773 * It is OK to emit floppy commands because we are in an interrupt
1774 * handler here, and thus we have to fear no interference of other
1778 do_print = !handler && print_unex && !initialising;
1782 print_result("unexpected interrupt", inr);
1786 output_byte(FD_SENSEI);
1789 print_result("sensei", inr);
1791 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2
1798 schedule_bh(handler);
1799 is_alive("normal interrupt end");
1801 /* FIXME! Was it really for us? */
1805 static void recalibrate_floppy(void)
1807 debugt("recalibrate floppy:");
1808 do_floppy = recal_interrupt;
1809 output_byte(FD_RECALIBRATE);
1810 if (output_byte(UNIT(current_drive)) < 0) {
1817 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1819 static void reset_interrupt(void)
1821 debugt("reset interrupt:");
1822 result(); /* get the status ready for set_fdc */
1824 pr_info("reset set in interrupt, calling %p\n", cont->error);
1825 cont->error(); /* a reset just after a reset. BAD! */
1831 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1832 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1834 static void reset_fdc(void)
1836 unsigned long flags;
1838 do_floppy = reset_interrupt;
1842 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1843 /* Irrelevant for systems with true DMA (i386). */
1845 flags = claim_dma_lock();
1847 release_dma_lock(flags);
1849 if (FDCS->version >= FDC_82072A)
1850 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1852 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1853 udelay(FD_RESET_DELAY);
1854 fd_outb(FDCS->dor, FD_DOR);
1858 static void show_floppy(void)
1863 pr_info("floppy driver state\n");
1864 pr_info("-------------------\n");
1865 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n",
1866 jiffies, interruptjiffies, jiffies - interruptjiffies,
1869 #ifdef FLOPPY_SANITY_CHECK
1870 pr_info("timeout_message=%s\n", timeout_message);
1871 pr_info("last output bytes:\n");
1872 for (i = 0; i < OLOGSIZE; i++)
1873 pr_info("%2x %2x %lu\n",
1874 output_log[(i + output_log_pos) % OLOGSIZE].data,
1875 output_log[(i + output_log_pos) % OLOGSIZE].status,
1876 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1877 pr_info("last result at %lu\n", resultjiffies);
1878 pr_info("last redo_fd_request at %lu\n", lastredo);
1879 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1880 reply_buffer, resultsize, true);
1883 pr_info("status=%x\n", fd_inb(FD_STATUS));
1884 pr_info("fdc_busy=%lu\n", fdc_busy);
1886 pr_info("do_floppy=%p\n", do_floppy);
1887 if (work_pending(&floppy_work))
1888 pr_info("floppy_work.func=%p\n", floppy_work.func);
1889 if (timer_pending(&fd_timer))
1890 pr_info("fd_timer.function=%p\n", fd_timer.function);
1891 if (timer_pending(&fd_timeout)) {
1892 pr_info("timer_function=%p\n", fd_timeout.function);
1893 pr_info("expires=%lu\n", fd_timeout.expires - jiffies);
1894 pr_info("now=%lu\n", jiffies);
1896 pr_info("cont=%p\n", cont);
1897 pr_info("current_req=%p\n", current_req);
1898 pr_info("command_status=%d\n", command_status);
1902 static void floppy_shutdown(unsigned long data)
1904 unsigned long flags;
1910 floppy_enable_hlt();
1912 flags = claim_dma_lock();
1914 release_dma_lock(flags);
1916 /* avoid dma going to a random drive after shutdown */
1919 DPRINT("floppy timeout called\n");
1923 cont->redo(); /* this will recall reset when needed */
1925 pr_info("no cont in shutdown!\n");
1926 process_fd_request();
1928 is_alive("floppy shutdown");
1931 /* start motor, check media-changed condition and write protection */
1932 static int start_motor(void (*function)(void))
1938 data = UNIT(current_drive);
1939 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1940 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1942 /* no read since this drive is running */
1943 DRS->first_read_date = 0;
1944 /* note motor start time if motor is not yet running */
1945 DRS->spinup_date = jiffies;
1946 data |= (0x10 << UNIT(current_drive));
1948 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1949 mask &= ~(0x10 << UNIT(current_drive));
1951 /* starts motor and selects floppy */
1952 del_timer(motor_off_timer + current_drive);
1953 set_dor(fdc, mask, data);
1955 /* wait_for_completion also schedules reset if needed. */
1956 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1957 (timeout_fn)function);
1960 static void floppy_ready(void)
1966 if (start_motor(floppy_ready))
1972 if (DP->flags & FD_DEBUG)
1973 DPRINT("calling disk change from floppy_ready\n");
1975 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1976 disk_change(current_drive) && !DP->select_delay)
1977 twaddle(); /* this clears the dcl on certain
1978 * drive/controller combinations */
1980 #ifdef fd_chose_dma_mode
1981 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1982 unsigned long flags = claim_dma_lock();
1983 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1984 release_dma_lock(flags);
1988 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1989 perpendicular_mode();
1990 fdc_specify(); /* must be done here because of hut, hlt ... */
1993 if ((raw_cmd->flags & FD_RAW_READ) ||
1994 (raw_cmd->flags & FD_RAW_WRITE))
2000 static void floppy_start(void)
2002 reschedule_timeout(current_reqD, "floppy start", 0);
2006 if (DP->flags & FD_DEBUG)
2007 DPRINT("setting NEWCHANGE in floppy_start\n");
2009 SETF(FD_DISK_NEWCHANGE);
2014 * ========================================================================
2015 * here ends the bottom half. Exported routines are:
2016 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
2017 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
2018 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
2020 * ========================================================================
2023 * General purpose continuations.
2024 * ==============================
2027 static void do_wakeup(void)
2029 reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
2031 command_status += 2;
2032 wake_up(&command_done);
2035 static struct cont_t wakeup_cont = {
2039 .done = (done_f)empty
2042 static struct cont_t intr_cont = {
2044 .redo = process_fd_request,
2046 .done = (done_f)empty
2049 static int wait_til_done(void (*handler)(void), int interruptible)
2053 schedule_bh(handler);
2055 if (command_status < 2 && NO_SIGNAL) {
2056 DECLARE_WAITQUEUE(wait, current);
2058 add_wait_queue(&command_done, &wait);
2060 set_current_state(interruptible ?
2061 TASK_INTERRUPTIBLE :
2062 TASK_UNINTERRUPTIBLE);
2064 if (command_status >= 2 || !NO_SIGNAL)
2067 is_alive("wait_til_done");
2071 set_current_state(TASK_RUNNING);
2072 remove_wait_queue(&command_done, &wait);
2075 if (command_status < 2) {
2083 command_status = FD_COMMAND_ERROR;
2084 if (command_status == FD_COMMAND_OKAY)
2088 command_status = FD_COMMAND_NONE;
2092 static void generic_done(int result)
2094 command_status = result;
2095 cont = &wakeup_cont;
2098 static void generic_success(void)
2103 static void generic_failure(void)
2108 static void success_and_wakeup(void)
2115 * formatting and rw support.
2116 * ==========================
2119 static int next_valid_format(void)
2123 probed_format = DRS->probed_format;
2125 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2126 DRS->probed_format = 0;
2129 if (floppy_type[DP->autodetect[probed_format]].sect) {
2130 DRS->probed_format = probed_format;
2137 static void bad_flp_intr(void)
2142 DRS->probed_format++;
2143 if (!next_valid_format())
2146 err_count = ++(*errors);
2147 INFBOUND(DRWE->badness, err_count);
2148 if (err_count > DP->max_errors.abort)
2150 if (err_count > DP->max_errors.reset)
2152 else if (err_count > DP->max_errors.recal)
2153 DRS->track = NEED_2_RECAL;
2156 static void set_floppy(int drive)
2158 int type = ITYPE(UDRS->fd_device);
2161 _floppy = floppy_type + type;
2163 _floppy = current_type[drive];
2167 * formatting support.
2168 * ===================
2170 static void format_interrupt(void)
2172 switch (interpret_errors()) {
2183 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
2184 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2185 #define CT(x) ((x) | 0xc0)
2187 static void setup_format_params(int track)
2195 unsigned char track, head, sect, size;
2196 } *here = (struct fparm *)floppy_track_buffer;
2198 raw_cmd = &default_raw_cmd;
2199 raw_cmd->track = track;
2201 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2202 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2203 raw_cmd->rate = _floppy->rate & 0x43;
2204 raw_cmd->cmd_count = NR_F;
2205 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2206 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2207 F_SIZECODE = FD_SIZECODE(_floppy);
2208 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2209 F_GAP = _floppy->fmt_gap;
2210 F_FILL = FD_FILL_BYTE;
2212 raw_cmd->kernel_data = floppy_track_buffer;
2213 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2215 /* allow for about 30ms for data transport per track */
2216 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2218 /* a ``cylinder'' is two tracks plus a little stepping time */
2219 track_shift = 2 * head_shift + 3;
2221 /* position of logical sector 1 on this track */
2222 n = (track_shift * format_req.track + head_shift * format_req.head)
2225 /* determine interleave */
2227 if (_floppy->fmt_gap < 0x22)
2230 /* initialize field */
2231 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2232 here[count].track = format_req.track;
2233 here[count].head = format_req.head;
2234 here[count].sect = 0;
2235 here[count].size = F_SIZECODE;
2237 /* place logical sectors */
2238 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2239 here[n].sect = count;
2240 n = (n + il) % F_SECT_PER_TRACK;
2241 if (here[n].sect) { /* sector busy, find next free sector */
2243 if (n >= F_SECT_PER_TRACK) {
2244 n -= F_SECT_PER_TRACK;
2245 while (here[n].sect)
2250 if (_floppy->stretch & FD_SECTBASEMASK) {
2251 for (count = 0; count < F_SECT_PER_TRACK; count++)
2252 here[count].sect += FD_SECTBASE(_floppy) - 1;
2256 static void redo_format(void)
2259 setup_format_params(format_req.track << STRETCH(_floppy));
2261 debugt("queue format request");
2264 static struct cont_t format_cont = {
2265 .interrupt = format_interrupt,
2266 .redo = redo_format,
2267 .error = bad_flp_intr,
2268 .done = generic_done
2271 static int do_format(int drive, struct format_descr *tmp_format_req)
2275 if (lock_fdc(drive, 1))
2280 _floppy->track > DP->tracks ||
2281 tmp_format_req->track >= _floppy->track ||
2282 tmp_format_req->head >= _floppy->head ||
2283 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2284 !_floppy->fmt_gap) {
2285 process_fd_request();
2288 format_req = *tmp_format_req;
2290 cont = &format_cont;
2291 errors = &format_errors;
2293 process_fd_request();
2298 * Buffer read/write and support
2299 * =============================
2302 static void floppy_end_request(struct request *req, int error)
2304 unsigned int nr_sectors = current_count_sectors;
2305 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2307 /* current_count_sectors can be zero if transfer failed */
2309 nr_sectors = blk_rq_cur_sectors(req);
2310 if (__blk_end_request(req, error, nr_sectors << 9))
2313 /* We're done with the request */
2318 /* new request_done. Can handle physical sectors which are smaller than a
2320 static void request_done(int uptodate)
2322 struct request_queue *q = floppy_queue;
2323 struct request *req = current_req;
2324 unsigned long flags;
2328 reschedule_timeout(MAXTIMEOUT, "request done", uptodate);
2331 pr_info("floppy.c: no request in request_done\n");
2336 /* maintain values for invalidation on geometry
2338 block = current_count_sectors + blk_rq_pos(req);
2339 INFBOUND(DRS->maxblock, block);
2340 if (block > _floppy->sect)
2343 /* unlock chained buffers */
2344 spin_lock_irqsave(q->queue_lock, flags);
2345 floppy_end_request(req, 0);
2346 spin_unlock_irqrestore(q->queue_lock, flags);
2348 if (rq_data_dir(req) == WRITE) {
2349 /* record write error information */
2350 DRWE->write_errors++;
2351 if (DRWE->write_errors == 1) {
2352 DRWE->first_error_sector = blk_rq_pos(req);
2353 DRWE->first_error_generation = DRS->generation;
2355 DRWE->last_error_sector = blk_rq_pos(req);
2356 DRWE->last_error_generation = DRS->generation;
2358 spin_lock_irqsave(q->queue_lock, flags);
2359 floppy_end_request(req, -EIO);
2360 spin_unlock_irqrestore(q->queue_lock, flags);
2364 /* Interrupt handler evaluating the result of the r/w operation */
2365 static void rw_interrupt(void)
2373 /* some Toshiba floppy controllers occasionnally seem to
2374 * return bogus interrupts after read/write operations, which
2375 * can be recognized by a bad head number (>= 2) */
2379 if (!DRS->first_read_date)
2380 DRS->first_read_date = jiffies;
2395 nr_sectors = (((R_TRACK - TRACK) * heads +
2396 R_HEAD - HEAD) * SECT_PER_TRACK +
2397 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2399 #ifdef FLOPPY_SANITY_CHECK
2400 if (nr_sectors / ssize >
2401 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2402 DPRINT("long rw: %x instead of %lx\n",
2403 nr_sectors, current_count_sectors);
2404 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2405 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2406 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2407 pr_info("heads=%d eoc=%d\n", heads, eoc);
2408 pr_info("spt=%d st=%d ss=%d\n",
2409 SECT_PER_TRACK, fsector_t, ssize);
2410 pr_info("in_sector_offset=%d\n", in_sector_offset);
2414 nr_sectors -= in_sector_offset;
2415 INFBOUND(nr_sectors, 0);
2416 SUPBOUND(current_count_sectors, nr_sectors);
2418 switch (interpret_errors()) {
2423 if (!current_count_sectors) {
2430 if (!current_count_sectors) {
2434 current_type[current_drive] = _floppy;
2435 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2440 if (DP->flags & FTD_MSG)
2441 DPRINT("Auto-detected floppy type %s in fd%d\n",
2442 _floppy->name, current_drive);
2443 current_type[current_drive] = _floppy;
2444 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2448 if (CT(COMMAND) != FD_READ ||
2449 raw_cmd->kernel_data == current_req->buffer) {
2450 /* transfer directly from buffer */
2452 } else if (CT(COMMAND) == FD_READ) {
2453 buffer_track = raw_cmd->track;
2454 buffer_drive = current_drive;
2455 INFBOUND(buffer_max, nr_sectors + fsector_t);
2460 /* Compute maximal contiguous buffer size. */
2461 static int buffer_chain_size(void)
2465 struct req_iterator iter;
2468 base = bio_data(current_req->bio);
2471 rq_for_each_segment(bv, current_req, iter) {
2472 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2481 /* Compute the maximal transfer size */
2482 static int transfer_size(int ssize, int max_sector, int max_size)
2484 SUPBOUND(max_sector, fsector_t + max_size);
2487 max_sector -= (max_sector % _floppy->sect) % ssize;
2489 /* transfer size, beginning not aligned */
2490 current_count_sectors = max_sector - fsector_t;
2496 * Move data from/to the track buffer to/from the buffer cache.
2498 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2500 int remaining; /* number of transferred 512-byte sectors */
2505 struct req_iterator iter;
2507 max_sector = transfer_size(ssize,
2508 min(max_sector, max_sector_2),
2509 blk_rq_sectors(current_req));
2511 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2512 buffer_max > fsector_t + blk_rq_sectors(current_req))
2513 current_count_sectors = min_t(int, buffer_max - fsector_t,
2514 blk_rq_sectors(current_req));
2516 remaining = current_count_sectors << 9;
2517 #ifdef FLOPPY_SANITY_CHECK
2518 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2519 DPRINT("in copy buffer\n");
2520 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2521 pr_info("remaining=%d\n", remaining >> 9);
2522 pr_info("current_req->nr_sectors=%u\n",
2523 blk_rq_sectors(current_req));
2524 pr_info("current_req->current_nr_sectors=%u\n",
2525 blk_rq_cur_sectors(current_req));
2526 pr_info("max_sector=%d\n", max_sector);
2527 pr_info("ssize=%d\n", ssize);
2531 buffer_max = max(max_sector, buffer_max);
2533 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2535 size = blk_rq_cur_bytes(current_req);
2537 rq_for_each_segment(bv, current_req, iter) {
2542 SUPBOUND(size, remaining);
2544 buffer = page_address(bv->bv_page) + bv->bv_offset;
2545 #ifdef FLOPPY_SANITY_CHECK
2546 if (dma_buffer + size >
2547 floppy_track_buffer + (max_buffer_sectors << 10) ||
2548 dma_buffer < floppy_track_buffer) {
2549 DPRINT("buffer overrun in copy buffer %d\n",
2550 (int)((floppy_track_buffer - dma_buffer) >> 9));
2551 pr_info("fsector_t=%d buffer_min=%d\n",
2552 fsector_t, buffer_min);
2553 pr_info("current_count_sectors=%ld\n",
2554 current_count_sectors);
2555 if (CT(COMMAND) == FD_READ)
2557 if (CT(COMMAND) == FD_WRITE)
2561 if (((unsigned long)buffer) % 512)
2562 DPRINT("%p buffer not aligned\n", buffer);
2564 if (CT(COMMAND) == FD_READ)
2565 memcpy(buffer, dma_buffer, size);
2567 memcpy(dma_buffer, buffer, size);
2572 #ifdef FLOPPY_SANITY_CHECK
2575 max_sector -= remaining >> 9;
2576 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2581 /* work around a bug in pseudo DMA
2582 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2583 * sending data. Hence we need a different way to signal the
2584 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2585 * does not work with MT, hence we can only transfer one head at
2588 static void virtualdmabug_workaround(void)
2593 if (CT(COMMAND) == FD_WRITE) {
2594 COMMAND &= ~0x80; /* switch off multiple track mode */
2596 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2597 end_sector = SECTOR + hard_sectors - 1;
2598 #ifdef FLOPPY_SANITY_CHECK
2599 if (end_sector > SECT_PER_TRACK) {
2600 pr_info("too many sectors %d > %d\n",
2601 end_sector, SECT_PER_TRACK);
2605 SECT_PER_TRACK = end_sector;
2606 /* make sure SECT_PER_TRACK
2607 * points to end of transfer */
2612 * Formulate a read/write request.
2613 * this routine decides where to load the data (directly to buffer, or to
2614 * tmp floppy area), how much data to load (the size of the buffer, the whole
2615 * track, or a single sector)
2616 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2617 * allocation on the fly, it should be done here. No other part should need
2621 static int make_raw_rw_request(void)
2623 int aligned_sector_t;
2629 if (max_buffer_sectors == 0) {
2630 pr_info("VFS: Block I/O scheduled on unopened device\n");
2634 set_fdc((long)current_req->rq_disk->private_data);
2636 raw_cmd = &default_raw_cmd;
2637 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2639 raw_cmd->cmd_count = NR_RW;
2640 if (rq_data_dir(current_req) == READ) {
2641 raw_cmd->flags |= FD_RAW_READ;
2642 COMMAND = FM_MODE(_floppy, FD_READ);
2643 } else if (rq_data_dir(current_req) == WRITE) {
2644 raw_cmd->flags |= FD_RAW_WRITE;
2645 COMMAND = FM_MODE(_floppy, FD_WRITE);
2647 DPRINT("make_raw_rw_request: unknown command\n");
2651 max_sector = _floppy->sect * _floppy->head;
2653 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2654 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2655 if (_floppy->track && TRACK >= _floppy->track) {
2656 if (blk_rq_cur_sectors(current_req) & 1) {
2657 current_count_sectors = 1;
2662 HEAD = fsector_t / _floppy->sect;
2664 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2665 TESTF(FD_NEED_TWADDLE)) && fsector_t < _floppy->sect)
2666 max_sector = _floppy->sect;
2668 /* 2M disks have phantom sectors on the first track */
2669 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2670 max_sector = 2 * _floppy->sect / 3;
2671 if (fsector_t >= max_sector) {
2672 current_count_sectors =
2673 min_t(int, _floppy->sect - fsector_t,
2674 blk_rq_sectors(current_req));
2679 SIZECODE = FD_SIZECODE(_floppy);
2680 raw_cmd->rate = _floppy->rate & 0x43;
2681 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2688 raw_cmd->track = TRACK << STRETCH(_floppy);
2689 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2692 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2693 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2694 FD_SECTBASE(_floppy);
2696 /* tracksize describes the size which can be filled up with sectors
2699 tracksize = _floppy->sect - _floppy->sect % ssize;
2700 if (tracksize < _floppy->sect) {
2702 if (tracksize <= fsector_t % _floppy->sect)
2705 /* if we are beyond tracksize, fill up using smaller sectors */
2706 while (tracksize <= fsector_t % _floppy->sect) {
2707 while (tracksize + ssize > _floppy->sect) {
2715 max_sector = HEAD * _floppy->sect + tracksize;
2716 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2717 max_sector = _floppy->sect;
2718 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2719 /* for virtual DMA bug workaround */
2720 max_sector = _floppy->sect;
2723 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2724 aligned_sector_t = fsector_t - in_sector_offset;
2725 max_size = blk_rq_sectors(current_req);
2726 if ((raw_cmd->track == buffer_track) &&
2727 (current_drive == buffer_drive) &&
2728 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2729 /* data already in track buffer */
2730 if (CT(COMMAND) == FD_READ) {
2731 copy_buffer(1, max_sector, buffer_max);
2734 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2735 if (CT(COMMAND) == FD_WRITE) {
2736 unsigned int sectors;
2738 sectors = fsector_t + blk_rq_sectors(current_req);
2739 if (sectors > ssize && sectors < ssize + ssize)
2740 max_size = ssize + ssize;
2744 raw_cmd->flags &= ~FD_RAW_WRITE;
2745 raw_cmd->flags |= FD_RAW_READ;
2746 COMMAND = FM_MODE(_floppy, FD_READ);
2747 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2748 unsigned long dma_limit;
2749 int direct, indirect;
2752 transfer_size(ssize, max_sector,
2753 max_buffer_sectors * 2) - fsector_t;
2756 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2757 * on a 64 bit machine!
2759 max_size = buffer_chain_size();
2760 dma_limit = (MAX_DMA_ADDRESS -
2761 ((unsigned long)current_req->buffer)) >> 9;
2762 if ((unsigned long)max_size > dma_limit)
2763 max_size = dma_limit;
2764 /* 64 kb boundaries */
2765 if (CROSS_64KB(current_req->buffer, max_size << 9))
2767 ((unsigned long)current_req->buffer) %
2769 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2771 * We try to read tracks, but if we get too many errors, we
2772 * go back to reading just one sector at a time.
2774 * This means we should be able to read a sector even if there
2775 * are other bad sectors on this track.
2778 (indirect * 2 > direct * 3 &&
2779 *errors < DP->max_errors.read_track &&
2781 (DP->read_track & (1 << DRS->probed_format)))))) {
2782 max_size = blk_rq_sectors(current_req);
2784 raw_cmd->kernel_data = current_req->buffer;
2785 raw_cmd->length = current_count_sectors << 9;
2786 if (raw_cmd->length == 0) {
2787 DPRINT("zero dma transfer attempted from make_raw_request\n");
2788 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2789 indirect, direct, fsector_t);
2792 virtualdmabug_workaround();
2797 if (CT(COMMAND) == FD_READ)
2798 max_size = max_sector; /* unbounded */
2800 /* claim buffer track if needed */
2801 if (buffer_track != raw_cmd->track || /* bad track */
2802 buffer_drive != current_drive || /* bad drive */
2803 fsector_t > buffer_max ||
2804 fsector_t < buffer_min ||
2805 ((CT(COMMAND) == FD_READ ||
2806 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2807 max_sector > 2 * max_buffer_sectors + buffer_min &&
2808 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2809 /* not enough space */
2811 buffer_drive = current_drive;
2812 buffer_max = buffer_min = aligned_sector_t;
2814 raw_cmd->kernel_data = floppy_track_buffer +
2815 ((aligned_sector_t - buffer_min) << 9);
2817 if (CT(COMMAND) == FD_WRITE) {
2818 /* copy write buffer to track buffer.
2819 * if we get here, we know that the write
2820 * is either aligned or the data already in the buffer
2821 * (buffer will be overwritten) */
2822 #ifdef FLOPPY_SANITY_CHECK
2823 if (in_sector_offset && buffer_track == -1)
2824 DPRINT("internal error offset !=0 on write\n");
2826 buffer_track = raw_cmd->track;
2827 buffer_drive = current_drive;
2828 copy_buffer(ssize, max_sector,
2829 2 * max_buffer_sectors + buffer_min);
2831 transfer_size(ssize, max_sector,
2832 2 * max_buffer_sectors + buffer_min -
2835 /* round up current_count_sectors to get dma xfer size */
2836 raw_cmd->length = in_sector_offset + current_count_sectors;
2837 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2838 raw_cmd->length <<= 9;
2839 #ifdef FLOPPY_SANITY_CHECK
2840 if ((raw_cmd->length < current_count_sectors << 9) ||
2841 (raw_cmd->kernel_data != current_req->buffer &&
2842 CT(COMMAND) == FD_WRITE &&
2843 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2844 aligned_sector_t < buffer_min)) ||
2845 raw_cmd->length % (128 << SIZECODE) ||
2846 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2847 DPRINT("fractionary current count b=%lx s=%lx\n",
2848 raw_cmd->length, current_count_sectors);
2849 if (raw_cmd->kernel_data != current_req->buffer)
2850 pr_info("addr=%d, length=%ld\n",
2851 (int)((raw_cmd->kernel_data -
2852 floppy_track_buffer) >> 9),
2853 current_count_sectors);
2854 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2855 fsector_t, aligned_sector_t, max_sector, max_size);
2856 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2857 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2858 COMMAND, SECTOR, HEAD, TRACK);
2859 pr_info("buffer drive=%d\n", buffer_drive);
2860 pr_info("buffer track=%d\n", buffer_track);
2861 pr_info("buffer_min=%d\n", buffer_min);
2862 pr_info("buffer_max=%d\n", buffer_max);
2866 if (raw_cmd->kernel_data != current_req->buffer) {
2867 if (raw_cmd->kernel_data < floppy_track_buffer ||
2868 current_count_sectors < 0 ||
2869 raw_cmd->length < 0 ||
2870 raw_cmd->kernel_data + raw_cmd->length >
2871 floppy_track_buffer + (max_buffer_sectors << 10)) {
2872 DPRINT("buffer overrun in schedule dma\n");
2873 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2874 fsector_t, buffer_min, raw_cmd->length >> 9);
2875 pr_info("current_count_sectors=%ld\n",
2876 current_count_sectors);
2877 if (CT(COMMAND) == FD_READ)
2879 if (CT(COMMAND) == FD_WRITE)
2883 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2884 current_count_sectors > blk_rq_sectors(current_req)) {
2885 DPRINT("buffer overrun in direct transfer\n");
2887 } else if (raw_cmd->length < current_count_sectors << 9) {
2888 DPRINT("more sectors than bytes\n");
2889 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2890 pr_info("sectors=%ld\n", current_count_sectors);
2892 if (raw_cmd->length == 0) {
2893 DPRINT("zero dma transfer attempted from make_raw_request\n");
2898 virtualdmabug_workaround();
2902 static void redo_fd_request(void)
2904 #define REPEAT {request_done(0); continue; }
2909 if (current_drive < N_DRIVE)
2910 floppy_off(current_drive);
2914 struct request *req;
2916 spin_lock_irq(floppy_queue->queue_lock);
2917 req = blk_fetch_request(floppy_queue);
2918 spin_unlock_irq(floppy_queue->queue_lock);
2926 drive = (long)current_req->rq_disk->private_data;
2928 reschedule_timeout(current_reqD, "redo fd request", 0);
2931 raw_cmd = &default_raw_cmd;
2933 if (start_motor(redo_fd_request))
2935 disk_change(current_drive);
2936 if (test_bit(current_drive, &fake_change) ||
2937 TESTF(FD_DISK_CHANGED)) {
2938 DPRINT("disk absent or changed during operation\n");
2941 if (!_floppy) { /* Autodetection */
2943 DRS->probed_format = 0;
2944 if (next_valid_format()) {
2945 DPRINT("no autodetectable formats\n");
2952 floppy_type + DP->autodetect[DRS->probed_format];
2955 errors = &(current_req->errors);
2956 tmp = make_raw_rw_request();
2962 if (TESTF(FD_NEED_TWADDLE))
2964 schedule_bh(floppy_start);
2965 debugt("queue fd request");
2971 static struct cont_t rw_cont = {
2972 .interrupt = rw_interrupt,
2973 .redo = redo_fd_request,
2974 .error = bad_flp_intr,
2975 .done = request_done
2978 static void process_fd_request(void)
2981 schedule_bh(redo_fd_request);
2984 static void do_fd_request(struct request_queue *q)
2986 if (max_buffer_sectors == 0) {
2987 pr_info("VFS: do_fd_request called on non-open device\n");
2991 if (usage_count == 0) {
2992 pr_info("warning: usage count=0, current_req=%p exiting\n",
2994 pr_info("sect=%ld type=%x flags=%x\n",
2995 (long)blk_rq_pos(current_req), current_req->cmd_type,
2996 current_req->cmd_flags);
2999 if (test_bit(0, &fdc_busy)) {
3000 /* fdc busy, this new request will be treated when the
3001 current one is done */
3002 is_alive("do fd request, old request running");
3005 lock_fdc(MAXTIMEOUT, 0);
3006 process_fd_request();
3007 is_alive("do fd request");
3010 static struct cont_t poll_cont = {
3011 .interrupt = success_and_wakeup,
3012 .redo = floppy_ready,
3013 .error = generic_failure,
3014 .done = generic_done
3017 static int poll_drive(int interruptible, int flag)
3021 /* no auto-sense, just clear dcl */
3022 raw_cmd = &default_raw_cmd;
3023 raw_cmd->flags = flag;
3025 raw_cmd->cmd_count = 0;
3028 if (DP->flags & FD_DEBUG)
3029 DPRINT("setting NEWCHANGE in poll_drive\n");
3031 SETF(FD_DISK_NEWCHANGE);
3037 * User triggered reset
3038 * ====================
3041 static void reset_intr(void)
3043 pr_info("weird, reset interrupt called\n");
3046 static struct cont_t reset_cont = {
3047 .interrupt = reset_intr,
3048 .redo = success_and_wakeup,
3049 .error = generic_failure,
3050 .done = generic_done
3053 static int user_reset_fdc(int drive, int arg, int interruptible)
3057 if (lock_fdc(drive, interruptible))
3060 if (arg == FD_RESET_ALWAYS)
3066 process_fd_request();
3071 * Misc Ioctl's and support
3072 * ========================
3074 static inline int fd_copyout(void __user *param, const void *address,
3077 return copy_to_user(param, address, size) ? -EFAULT : 0;
3080 static inline int fd_copyin(void __user *param, void *address,
3083 return copy_from_user(address, param, size) ? -EFAULT : 0;
3086 #define _COPYOUT(x) (copy_to_user((void __user *)param, &(x), sizeof(x)) \
3088 #define _COPYIN(x) (copy_from_user(&(x), (void __user *)param, sizeof(x)) \
3091 #define COPYOUT(x) ECALL(_COPYOUT(x))
3092 #define COPYIN(x) ECALL(_COPYIN(x))
3094 static inline const char *drive_name(int type, int drive)
3096 struct floppy_struct *floppy;
3099 floppy = floppy_type + type;
3101 if (UDP->native_format)
3102 floppy = floppy_type + UDP->native_format;
3107 return floppy->name;
3113 static void raw_cmd_done(int flag)
3118 raw_cmd->flags |= FD_RAW_FAILURE;
3119 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3121 raw_cmd->reply_count = inr;
3122 if (raw_cmd->reply_count > MAX_REPLIES)
3123 raw_cmd->reply_count = 0;
3124 for (i = 0; i < raw_cmd->reply_count; i++)
3125 raw_cmd->reply[i] = reply_buffer[i];
3127 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3128 unsigned long flags;
3129 flags = claim_dma_lock();
3130 raw_cmd->length = fd_get_dma_residue();
3131 release_dma_lock(flags);
3134 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3135 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3136 raw_cmd->flags |= FD_RAW_FAILURE;
3138 if (disk_change(current_drive))
3139 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3141 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3142 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3143 motor_off_callback(current_drive);
3145 if (raw_cmd->next &&
3146 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3147 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3148 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3149 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3150 raw_cmd = raw_cmd->next;
3157 static struct cont_t raw_cmd_cont = {
3158 .interrupt = success_and_wakeup,
3159 .redo = floppy_start,
3160 .error = generic_failure,
3161 .done = raw_cmd_done
3164 static inline int raw_cmd_copyout(int cmd, char __user *param,
3165 struct floppy_raw_cmd *ptr)
3171 param += sizeof(struct floppy_raw_cmd);
3172 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3173 if (ptr->length >= 0 &&
3174 ptr->length <= ptr->buffer_length) {
3175 long length = ptr->buffer_length - ptr->length;
3176 ECALL(fd_copyout(ptr->data, ptr->kernel_data,
3185 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3187 struct floppy_raw_cmd *next;
3188 struct floppy_raw_cmd *this;
3193 if (this->buffer_length) {
3194 fd_dma_mem_free((unsigned long)this->kernel_data,
3195 this->buffer_length);
3196 this->buffer_length = 0;
3204 static inline int raw_cmd_copyin(int cmd, char __user *param,
3205 struct floppy_raw_cmd **rcmd)
3207 struct floppy_raw_cmd *ptr;
3213 ptr = (struct floppy_raw_cmd *)
3214 kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3220 ptr->buffer_length = 0;
3221 param += sizeof(struct floppy_raw_cmd);
3222 if (ptr->cmd_count > 33)
3223 /* the command may now also take up the space
3224 * initially intended for the reply & the
3225 * reply count. Needed for long 82078 commands
3226 * such as RESTORE, which takes ... 17 command
3227 * bytes. Murphy's law #137: When you reserve
3228 * 16 bytes for a structure, you'll one day
3229 * discover that you really need 17...
3233 for (i = 0; i < 16; i++)
3235 ptr->resultcode = 0;
3236 ptr->kernel_data = NULL;
3238 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3239 if (ptr->length <= 0)
3242 (char *)fd_dma_mem_alloc(ptr->length);
3243 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3244 if (!ptr->kernel_data)
3246 ptr->buffer_length = ptr->length;
3248 if (ptr->flags & FD_RAW_WRITE)
3249 ECALL(fd_copyin(ptr->data, ptr->kernel_data,
3251 rcmd = &(ptr->next);
3252 if (!(ptr->flags & FD_RAW_MORE))
3258 static int raw_cmd_ioctl(int cmd, void __user *param)
3260 struct floppy_raw_cmd *my_raw_cmd;
3265 if (FDCS->rawcmd <= 1)
3267 for (drive = 0; drive < N_DRIVE; drive++) {
3268 if (FDC(drive) != fdc)
3270 if (drive == current_drive) {
3271 if (UDRS->fd_ref > 1) {
3275 } else if (UDRS->fd_ref) {
3284 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3286 raw_cmd_free(&my_raw_cmd);
3290 raw_cmd = my_raw_cmd;
3291 cont = &raw_cmd_cont;
3292 ret = wait_til_done(floppy_start, 1);
3294 if (DP->flags & FD_DEBUG)
3295 DPRINT("calling disk change from raw_cmd ioctl\n");
3298 if (ret != -EINTR && FDCS->reset)
3301 DRS->track = NO_TRACK;
3303 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3306 raw_cmd_free(&my_raw_cmd);
3310 static int invalidate_drive(struct block_device *bdev)
3312 /* invalidate the buffer track to force a reread */
3313 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3314 process_fd_request();
3315 check_disk_change(bdev);
3319 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
3320 int drive, int type, struct block_device *bdev)
3324 /* sanity checking for parameters. */
3327 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3328 /* check if reserved bits are set */
3329 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3332 if (!capable(CAP_SYS_ADMIN))
3334 mutex_lock(&open_lock);
3335 if (lock_fdc(drive, 1)) {
3336 mutex_unlock(&open_lock);
3339 floppy_type[type] = *g;
3340 floppy_type[type].name = "user format";
3341 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3342 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3343 floppy_type[type].size + 1;
3344 process_fd_request();
3345 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3346 struct block_device *bdev = opened_bdev[cnt];
3347 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3349 __invalidate_device(bdev);
3351 mutex_unlock(&open_lock);
3355 if (lock_fdc(drive, 1))
3357 if (cmd != FDDEFPRM)
3358 /* notice a disk change immediately, else
3359 * we lose our settings immediately*/
3360 CALL(poll_drive(1, FD_RAW_NEED_DISK));
3361 oldStretch = g->stretch;
3362 user_params[drive] = *g;
3363 if (buffer_drive == drive)
3364 SUPBOUND(buffer_max, user_params[drive].sect);
3365 current_type[drive] = &user_params[drive];
3366 floppy_sizes[drive] = user_params[drive].size;
3367 if (cmd == FDDEFPRM)
3368 DRS->keep_data = -1;
3371 /* invalidation. Invalidate only when needed, i.e.
3372 * when there are already sectors in the buffer cache
3373 * whose number will change. This is useful, because
3374 * mtools often changes the geometry of the disk after
3375 * looking at the boot block */
3376 if (DRS->maxblock > user_params[drive].sect ||
3378 ((user_params[drive].sect ^ oldStretch) &
3379 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3380 invalidate_drive(bdev);
3382 process_fd_request();
3387 /* handle obsolete ioctl's */
3388 static int ioctl_table[] = {
3416 static inline int normalize_ioctl(int *cmd, int *size)
3420 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3421 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3422 *size = _IOC_SIZE(*cmd);
3423 *cmd = ioctl_table[i];
3424 if (*size > _IOC_SIZE(*cmd)) {
3425 pr_info("ioctl not yet supported\n");
3434 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3437 *g = &floppy_type[type];
3439 if (lock_fdc(drive, 0))
3441 CALL(poll_drive(0, 0));
3442 process_fd_request();
3443 *g = current_type[drive];
3450 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3452 int drive = (long)bdev->bd_disk->private_data;
3453 int type = ITYPE(drive_state[drive].fd_device);
3454 struct floppy_struct *g;
3457 ret = get_floppy_geometry(drive, type, &g);
3461 geo->heads = g->head;
3462 geo->sectors = g->sect;
3463 geo->cylinders = g->track;
3467 static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3468 unsigned long param)
3470 #define FD_IOCTL_ALLOWED (mode & (FMODE_WRITE|FMODE_WRITE_IOCTL))
3472 int drive = (long)bdev->bd_disk->private_data;
3473 int type = ITYPE(UDRS->fd_device);
3478 struct floppy_struct g; /* geometry */
3479 struct format_descr f;
3480 struct floppy_max_errors max_errors;
3481 struct floppy_drive_params dp;
3482 } inparam; /* parameters coming from user space */
3483 const char *outparam; /* parameters passed back to user space */
3485 /* convert compatibility eject ioctls into floppy eject ioctl.
3486 * We do this in order to provide a means to eject floppy disks before
3487 * installing the new fdutils package */
3488 if (cmd == CDROMEJECT || /* CD-ROM eject */
3489 cmd == 0x6470) { /* SunOS floppy eject */
3490 DPRINT("obsolete eject ioctl\n");
3491 DPRINT("please use floppycontrol --eject\n");
3495 if (!((cmd & 0xff00) == 0x0200))
3498 /* convert the old style command into a new style command */
3499 ECALL(normalize_ioctl(&cmd, &size));
3501 /* permission checks */
3502 if (((cmd & 0x40) && !FD_IOCTL_ALLOWED) ||
3503 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3506 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3510 memset(&inparam, 0, sizeof(inparam));
3511 if (_IOC_DIR(cmd) & _IOC_WRITE)
3512 ECALL(fd_copyin((void __user *)param, &inparam, size));
3516 if (UDRS->fd_ref != 1)
3517 /* somebody else has this drive open */
3519 if (lock_fdc(drive, 1))
3522 /* do the actual eject. Fails on
3523 * non-Sparc architectures */
3524 ret = fd_eject(UNIT(drive));
3526 USETF(FD_DISK_CHANGED);
3528 process_fd_request();
3531 if (lock_fdc(drive, 1))
3533 current_type[drive] = NULL;
3534 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3535 UDRS->keep_data = 0;
3536 return invalidate_drive(bdev);
3539 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3541 ECALL(get_floppy_geometry(drive, type,
3542 (struct floppy_struct **)
3546 UDP->flags |= FTD_MSG;
3549 UDP->flags &= ~FTD_MSG;
3552 if (lock_fdc(drive, 1))
3554 CALL(poll_drive(1, FD_RAW_NEED_DISK));
3556 process_fd_request();
3557 if (ret & FD_VERIFY)
3559 if (!(ret & FD_DISK_WRITABLE))
3563 if (UDRS->fd_ref != 1)
3565 return do_format(drive, &inparam.f);
3568 if (lock_fdc(drive, 1))
3570 return invalidate_drive(bdev);
3571 case FDSETEMSGTRESH:
3572 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3575 outparam = (const char *)&UDP->max_errors;
3578 UDP->max_errors = inparam.max_errors;
3581 outparam = drive_name(type, drive);
3582 SUPBOUND(size, strlen(outparam) + 1);
3588 outparam = (const char *)UDP;
3591 if (lock_fdc(drive, 1))
3593 CALL(poll_drive(1, FD_RAW_NEED_DISK));
3594 process_fd_request();
3597 outparam = (const char *)UDRS;
3600 return user_reset_fdc(drive, (int)param, 1);
3602 outparam = (const char *)UFDCS;
3605 memset(UDRWE, 0, sizeof(*UDRWE));
3608 outparam = (const char *)UDRWE;
3613 if (lock_fdc(drive, 1))
3616 CALL(i = raw_cmd_ioctl(cmd, (void __user *)param));
3617 process_fd_request();
3620 if (lock_fdc(drive, 1))
3623 process_fd_request();
3629 if (_IOC_DIR(cmd) & _IOC_READ)
3630 return fd_copyout((void __user *)param, outparam, size);
3635 static void __init config_types(void)
3637 bool has_drive = false;
3640 /* read drive info out of physical CMOS */
3643 UDP->cmos = FLOPPY0_TYPE;
3645 if (!UDP->cmos && FLOPPY1_TYPE)
3646 UDP->cmos = FLOPPY1_TYPE;
3648 /* FIXME: additional physical CMOS drive detection should go here */
3650 for (drive = 0; drive < N_DRIVE; drive++) {
3651 unsigned int type = UDP->cmos;
3652 struct floppy_drive_params *params;
3653 const char *name = NULL;
3654 static char temparea[32];
3656 if (type < ARRAY_SIZE(default_drive_params)) {
3657 params = &default_drive_params[type].params;
3659 name = default_drive_params[type].name;
3660 allowed_drive_mask |= 1 << drive;
3662 allowed_drive_mask &= ~(1 << drive);
3664 params = &default_drive_params[0].params;
3665 sprintf(temparea, "unknown type %d (usb?)", type);
3669 const char *prepend;
3673 pr_info("Floppy drive(s):");
3678 pr_cont("%s fd%d is %s", prepend, drive, name);
3687 static int floppy_release(struct gendisk *disk, fmode_t mode)
3689 int drive = (long)disk->private_data;
3691 mutex_lock(&open_lock);
3692 if (UDRS->fd_ref < 0)
3694 else if (!UDRS->fd_ref--) {
3695 DPRINT("floppy_release with fd_ref == 0");
3699 opened_bdev[drive] = NULL;
3700 mutex_unlock(&open_lock);
3706 * floppy_open check for aliasing (/dev/fd0 can be the same as
3707 * /dev/PS0 etc), and disallows simultaneous access to the same
3708 * drive with different device numbers.
3710 static int floppy_open(struct block_device *bdev, fmode_t mode)
3712 int drive = (long)bdev->bd_disk->private_data;
3713 int old_dev, new_dev;
3718 mutex_lock(&open_lock);
3719 old_dev = UDRS->fd_device;
3720 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3723 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3724 USETF(FD_DISK_CHANGED);
3728 if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
3731 if (mode & FMODE_EXCL)
3736 opened_bdev[drive] = bdev;
3740 if (!floppy_track_buffer) {
3741 /* if opening an ED drive, reserve a big buffer,
3742 * else reserve a small one */
3743 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3744 try = 64; /* Only 48 actually useful */
3746 try = 32; /* Only 24 actually useful */
3748 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3749 if (!tmp && !floppy_track_buffer) {
3750 try >>= 1; /* buffer only one side */
3752 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3754 if (!tmp && !floppy_track_buffer)
3755 fallback_on_nodma_alloc(&tmp, 2048 * try);
3756 if (!tmp && !floppy_track_buffer) {
3757 DPRINT("Unable to allocate DMA memory\n");
3760 if (floppy_track_buffer) {
3762 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3764 buffer_min = buffer_max = -1;
3765 floppy_track_buffer = tmp;
3766 max_buffer_sectors = try;
3770 new_dev = MINOR(bdev->bd_dev);
3771 UDRS->fd_device = new_dev;
3772 set_capacity(disks[drive], floppy_sizes[new_dev]);
3773 if (old_dev != -1 && old_dev != new_dev) {
3774 if (buffer_drive == drive)
3778 if (UFDCS->rawcmd == 1)
3781 if (!(mode & FMODE_NDELAY)) {
3782 if (mode & (FMODE_READ|FMODE_WRITE)) {
3783 UDRS->last_checked = 0;
3784 check_disk_change(bdev);
3785 if (UTESTF(FD_DISK_CHANGED))
3789 if ((mode & FMODE_WRITE) && !(UTESTF(FD_DISK_WRITABLE)))
3792 mutex_unlock(&open_lock);
3795 if (UDRS->fd_ref < 0)
3800 opened_bdev[drive] = NULL;
3802 mutex_unlock(&open_lock);
3807 * Check if the disk has been changed or if a change has been faked.
3809 static int check_floppy_change(struct gendisk *disk)
3811 int drive = (long)disk->private_data;
3813 if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3816 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3819 process_fd_request();
3822 if (UTESTF(FD_DISK_CHANGED) ||
3823 UTESTF(FD_VERIFY) ||
3824 test_bit(drive, &fake_change) ||
3825 (!ITYPE(UDRS->fd_device) && !current_type[drive]))
3831 * This implements "read block 0" for floppy_revalidate().
3832 * Needed for format autodetection, checking whether there is
3833 * a disk in the drive, and whether that disk is writable.
3836 static void floppy_rb0_complete(struct bio *bio, int err)
3838 complete((struct completion *)bio->bi_private);
3841 static int __floppy_read_block_0(struct block_device *bdev)
3844 struct bio_vec bio_vec;
3845 struct completion complete;
3849 page = alloc_page(GFP_NOIO);
3851 process_fd_request();
3855 size = bdev->bd_block_size;
3860 bio.bi_io_vec = &bio_vec;
3861 bio_vec.bv_page = page;
3862 bio_vec.bv_len = size;
3863 bio_vec.bv_offset = 0;
3869 init_completion(&complete);
3870 bio.bi_private = &complete;
3871 bio.bi_end_io = floppy_rb0_complete;
3873 submit_bio(READ, &bio);
3874 generic_unplug_device(bdev_get_queue(bdev));
3875 process_fd_request();
3876 wait_for_completion(&complete);
3883 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3884 * the bootblock (block 0). "Autodetection" is also needed to check whether
3885 * there is a disk in the drive at all... Thus we also do it for fixed
3886 * geometry formats */
3887 static int floppy_revalidate(struct gendisk *disk)
3889 int drive = (long)disk->private_data;
3890 #define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
3894 if (UTESTF(FD_DISK_CHANGED) ||
3895 UTESTF(FD_VERIFY) || test_bit(drive, &fake_change) || NO_GEOM) {
3896 if (usage_count == 0) {
3897 pr_info("VFS: revalidate called on non-open device.\n");
3901 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3902 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
3903 process_fd_request(); /*already done by another thread */
3908 if (buffer_drive == drive)
3910 clear_bit(drive, &fake_change);
3911 UCLEARF(FD_DISK_CHANGED);
3916 res = __floppy_read_block_0(opened_bdev[drive]);
3919 poll_drive(0, FD_RAW_NEED_DISK);
3920 process_fd_request();
3923 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3927 static const struct block_device_operations floppy_fops = {
3928 .owner = THIS_MODULE,
3929 .open = floppy_open,
3930 .release = floppy_release,
3931 .locked_ioctl = fd_ioctl,
3932 .getgeo = fd_getgeo,
3933 .media_changed = check_floppy_change,
3934 .revalidate_disk = floppy_revalidate,
3938 * Floppy Driver initialization
3939 * =============================
3942 /* Determine the floppy disk controller type */
3943 /* This routine was written by David C. Niemi */
3944 static char __init get_fdc_version(void)
3948 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
3953 return FDC_NONE; /* No FDC present ??? */
3954 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3955 pr_info("FDC %d is an 8272A\n", fdc);
3956 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
3959 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3964 if (!fdc_configure()) {
3965 pr_info("FDC %d is an 82072\n", fdc);
3966 return FDC_82072; /* 82072 doesn't know CONFIGURE */
3969 output_byte(FD_PERPENDICULAR);
3970 if (need_more_output() == MORE_OUTPUT) {
3973 pr_info("FDC %d is an 82072A\n", fdc);
3974 return FDC_82072A; /* 82072A as found on Sparcs. */
3977 output_byte(FD_UNLOCK);
3979 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3980 pr_info("FDC %d is a pre-1991 82077\n", fdc);
3981 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
3984 if ((r != 1) || (reply_buffer[0] != 0x00)) {
3985 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3989 output_byte(FD_PARTID);
3992 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3996 if (reply_buffer[0] == 0x80) {
3997 pr_info("FDC %d is a post-1991 82077\n", fdc);
3998 return FDC_82077; /* Revised 82077AA passes all the tests */
4000 switch (reply_buffer[0] >> 5) {
4002 /* Either a 82078-1 or a 82078SL running at 5Volt */
4003 pr_info("FDC %d is an 82078.\n", fdc);
4006 pr_info("FDC %d is a 44pin 82078\n", fdc);
4009 pr_info("FDC %d is a S82078B\n", fdc);
4012 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
4015 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4016 fdc, reply_buffer[0] >> 5);
4017 return FDC_82078_UNKN;
4019 } /* get_fdc_version */
4021 /* lilo configuration */
4023 static void __init floppy_set_flags(int *ints, int param, int param2)
4027 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4029 default_drive_params[i].params.flags |= param2;
4031 default_drive_params[i].params.flags &= ~param2;
4033 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4036 static void __init daring(int *ints, int param, int param2)
4040 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4042 default_drive_params[i].params.select_delay = 0;
4043 default_drive_params[i].params.flags |=
4044 FD_SILENT_DCL_CLEAR;
4046 default_drive_params[i].params.select_delay =
4048 default_drive_params[i].params.flags &=
4049 ~FD_SILENT_DCL_CLEAR;
4052 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4055 static void __init set_cmos(int *ints, int dummy, int dummy2)
4057 int current_drive = 0;
4060 DPRINT("wrong number of parameters for CMOS\n");
4063 current_drive = ints[1];
4064 if (current_drive < 0 || current_drive >= 8) {
4065 DPRINT("bad drive for set_cmos\n");
4069 if (current_drive >= 4 && !FDC2)
4073 DPRINT("setting CMOS code to %d\n", ints[2]);
4076 static struct param_table {
4078 void (*fn) (int *ints, int param, int param2);
4082 } config_params[] __initdata = {
4083 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4084 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4085 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4086 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4087 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4088 {"daring", daring, NULL, 1, 0},
4090 {"two_fdc", NULL, &FDC2, 0x370, 0},
4091 {"one_fdc", NULL, &FDC2, 0, 0},
4093 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4094 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4095 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4096 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4097 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4098 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4099 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4100 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4101 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4102 {"nofifo", NULL, &no_fifo, 0x20, 0},
4103 {"usefifo", NULL, &no_fifo, 0, 0},
4104 {"cmos", set_cmos, NULL, 0, 0},
4105 {"slow", NULL, &slow_floppy, 1, 0},
4106 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4107 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4108 {"L40SX", NULL, &print_unex, 0, 0}
4113 static int __init floppy_setup(char *str)
4119 str = get_options(str, ARRAY_SIZE(ints), ints);
4121 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4122 if (strcmp(str, config_params[i].name) == 0) {
4126 param = config_params[i].def_param;
4127 if (config_params[i].fn)
4128 config_params[i].fn(ints, param,
4131 if (config_params[i].var) {
4132 DPRINT("%s=%d\n", str, param);
4133 *config_params[i].var = param;
4140 DPRINT("unknown floppy option [%s]\n", str);
4142 DPRINT("allowed options are:");
4143 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4144 pr_cont(" %s", config_params[i].name);
4147 DPRINT("botched floppy option\n");
4148 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4152 static int have_no_fdc = -ENODEV;
4154 static ssize_t floppy_cmos_show(struct device *dev,
4155 struct device_attribute *attr, char *buf)
4157 struct platform_device *p = to_platform_device(dev);
4161 return sprintf(buf, "%X\n", UDP->cmos);
4164 DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4166 static void floppy_device_release(struct device *dev)
4170 static int floppy_resume(struct device *dev)
4174 for (fdc = 0; fdc < N_FDC; fdc++)
4175 if (FDCS->address != -1)
4176 user_reset_fdc(-1, FD_RESET_ALWAYS, 0);
4181 static const struct dev_pm_ops floppy_pm_ops = {
4182 .resume = floppy_resume,
4183 .restore = floppy_resume,
4186 static struct platform_driver floppy_driver = {
4189 .pm = &floppy_pm_ops,
4193 static struct platform_device floppy_device[N_DRIVE];
4195 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4197 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4198 if (drive >= N_DRIVE ||
4199 !(allowed_drive_mask & (1 << drive)) ||
4200 fdc_state[FDC(drive)].version == FDC_NONE)
4202 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4205 return get_disk(disks[drive]);
4208 static int __init floppy_init(void)
4213 #if defined(CONFIG_PPC)
4214 if (check_legacy_ioport(FDC1))
4220 for (dr = 0; dr < N_DRIVE; dr++) {
4221 disks[dr] = alloc_disk(1);
4227 disks[dr]->major = FLOPPY_MAJOR;
4228 disks[dr]->first_minor = TOMINOR(dr);
4229 disks[dr]->fops = &floppy_fops;
4230 sprintf(disks[dr]->disk_name, "fd%d", dr);
4232 init_timer(&motor_off_timer[dr]);
4233 motor_off_timer[dr].data = dr;
4234 motor_off_timer[dr].function = motor_off_callback;
4237 err = register_blkdev(FLOPPY_MAJOR, "fd");
4241 err = platform_driver_register(&floppy_driver);
4243 goto out_unreg_blkdev;
4245 floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
4246 if (!floppy_queue) {
4248 goto out_unreg_driver;
4250 blk_queue_max_hw_sectors(floppy_queue, 64);
4252 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4253 floppy_find, NULL, NULL);
4255 for (i = 0; i < 256; i++)
4257 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4259 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4261 reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
4264 for (i = 0; i < N_FDC; i++) {
4266 memset(FDCS, 0, sizeof(*FDCS));
4269 #if defined(__sparc__) || defined(__mc68000__)
4270 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4274 FDCS->version = FDC_82072A;
4278 use_virtual_dma = can_use_virtual_dma & 1;
4279 fdc_state[0].address = FDC1;
4280 if (fdc_state[0].address == -1) {
4281 del_timer(&fd_timeout);
4283 goto out_unreg_region;
4286 fdc_state[1].address = FDC2;
4289 fdc = 0; /* reset fdc in case of unexpected interrupt */
4290 err = floppy_grab_irq_and_dma();
4292 del_timer(&fd_timeout);
4294 goto out_unreg_region;
4297 /* initialise drive state */
4298 for (drive = 0; drive < N_DRIVE; drive++) {
4299 memset(UDRS, 0, sizeof(*UDRS));
4300 memset(UDRWE, 0, sizeof(*UDRWE));
4301 USETF(FD_DISK_NEWCHANGE);
4302 USETF(FD_DISK_CHANGED);
4304 UDRS->fd_device = -1;
4305 floppy_track_buffer = NULL;
4306 max_buffer_sectors = 0;
4309 * Small 10 msec delay to let through any interrupt that
4310 * initialization might have triggered, to not
4311 * confuse detection:
4315 for (i = 0; i < N_FDC; i++) {
4317 FDCS->driver_version = FD_DRIVER_VERSION;
4318 for (unit = 0; unit < 4; unit++)
4319 FDCS->track[unit] = 0;
4320 if (FDCS->address == -1)
4323 if (user_reset_fdc(-1, FD_RESET_ALWAYS, 0)) {
4324 /* free ioports reserved by floppy_grab_irq_and_dma() */
4325 floppy_release_regions(fdc);
4327 FDCS->version = FDC_NONE;
4330 /* Try to determine the floppy controller type */
4331 FDCS->version = get_fdc_version();
4332 if (FDCS->version == FDC_NONE) {
4333 /* free ioports reserved by floppy_grab_irq_and_dma() */
4334 floppy_release_regions(fdc);
4338 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4339 can_use_virtual_dma = 0;
4342 /* Not all FDCs seem to be able to handle the version command
4343 * properly, so force a reset for the standard FDC clones,
4344 * to avoid interrupt garbage.
4346 user_reset_fdc(-1, FD_RESET_ALWAYS, 0);
4349 del_timer(&fd_timeout);
4353 DPRINT("no floppy controllers found\n");
4355 goto out_flush_work;
4358 for (drive = 0; drive < N_DRIVE; drive++) {
4359 if (!(allowed_drive_mask & (1 << drive)))
4361 if (fdc_state[FDC(drive)].version == FDC_NONE)
4364 floppy_device[drive].name = floppy_device_name;
4365 floppy_device[drive].id = drive;
4366 floppy_device[drive].dev.release = floppy_device_release;
4368 err = platform_device_register(&floppy_device[drive]);
4370 goto out_flush_work;
4372 err = device_create_file(&floppy_device[drive].dev,
4375 goto out_unreg_platform_dev;
4377 /* to be cleaned up... */
4378 disks[drive]->private_data = (void *)(long)drive;
4379 disks[drive]->queue = floppy_queue;
4380 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4381 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4382 add_disk(disks[drive]);
4387 out_unreg_platform_dev:
4388 platform_device_unregister(&floppy_device[drive]);
4390 flush_scheduled_work();
4392 floppy_release_irq_and_dma();
4394 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4395 blk_cleanup_queue(floppy_queue);
4397 platform_driver_unregister(&floppy_driver);
4399 unregister_blkdev(FLOPPY_MAJOR, "fd");
4402 del_timer(&motor_off_timer[dr]);
4403 put_disk(disks[dr]);
4408 static DEFINE_SPINLOCK(floppy_usage_lock);
4410 static const struct io_region {
4415 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4417 /* address + 6 is reserved, and may be taken by IDE.
4418 * Unfortunately, Adaptec doesn't know this :-(, */
4422 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4424 while (p != io_regions) {
4426 release_region(FDCS->address + p->offset, p->size);
4430 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4432 static int floppy_request_regions(int fdc)
4434 const struct io_region *p;
4436 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4437 if (!request_region(FDCS->address + p->offset,
4438 p->size, "floppy")) {
4439 DPRINT("Floppy io-port 0x%04lx in use\n",
4440 FDCS->address + p->offset);
4441 floppy_release_allocated_regions(fdc, p);
4448 static void floppy_release_regions(int fdc)
4450 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4453 static int floppy_grab_irq_and_dma(void)
4455 unsigned long flags;
4457 spin_lock_irqsave(&floppy_usage_lock, flags);
4458 if (usage_count++) {
4459 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4462 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4465 * We might have scheduled a free_irq(), wait it to
4468 flush_scheduled_work();
4470 if (fd_request_irq()) {
4471 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4473 spin_lock_irqsave(&floppy_usage_lock, flags);
4475 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4478 if (fd_request_dma()) {
4479 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4481 if (can_use_virtual_dma & 2)
4482 use_virtual_dma = can_use_virtual_dma = 1;
4483 if (!(can_use_virtual_dma & 1)) {
4485 spin_lock_irqsave(&floppy_usage_lock, flags);
4487 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4492 for (fdc = 0; fdc < N_FDC; fdc++) {
4493 if (FDCS->address != -1) {
4494 if (floppy_request_regions(fdc))
4498 for (fdc = 0; fdc < N_FDC; fdc++) {
4499 if (FDCS->address != -1) {
4501 fd_outb(FDCS->dor, FD_DOR);
4505 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4507 for (fdc = 0; fdc < N_FDC; fdc++)
4508 if (FDCS->address != -1)
4509 fd_outb(FDCS->dor, FD_DOR);
4511 * The driver will try and free resources and relies on us
4512 * to know if they were allocated or not.
4515 irqdma_allocated = 1;
4521 floppy_release_regions(fdc);
4522 spin_lock_irqsave(&floppy_usage_lock, flags);
4524 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4528 static void floppy_release_irq_and_dma(void)
4531 #ifdef FLOPPY_SANITY_CHECK
4537 unsigned long tmpaddr;
4538 unsigned long flags;
4540 spin_lock_irqsave(&floppy_usage_lock, flags);
4541 if (--usage_count) {
4542 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4545 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4546 if (irqdma_allocated) {
4550 irqdma_allocated = 0;
4556 floppy_enable_hlt();
4558 if (floppy_track_buffer && max_buffer_sectors) {
4559 tmpsize = max_buffer_sectors * 1024;
4560 tmpaddr = (unsigned long)floppy_track_buffer;
4561 floppy_track_buffer = NULL;
4562 max_buffer_sectors = 0;
4563 buffer_min = buffer_max = -1;
4564 fd_dma_mem_free(tmpaddr, tmpsize);
4566 #ifdef FLOPPY_SANITY_CHECK
4568 for (drive = 0; drive < N_FDC * 4; drive++)
4569 if (timer_pending(motor_off_timer + drive))
4570 pr_info("motor off timer %d still active\n", drive);
4573 if (timer_pending(&fd_timeout))
4574 pr_info("floppy timer still active:%s\n", timeout_message);
4575 if (timer_pending(&fd_timer))
4576 pr_info("auxiliary floppy timer still active\n");
4577 if (work_pending(&floppy_work))
4578 pr_info("work still pending\n");
4581 for (fdc = 0; fdc < N_FDC; fdc++)
4582 if (FDCS->address != -1)
4583 floppy_release_regions(fdc);
4589 static char *floppy;
4591 static void __init parse_floppy_cfg_string(char *cfg)
4597 while (*cfg && *cfg != ' ' && *cfg != '\t')
4608 static int __init floppy_module_init(void)
4611 parse_floppy_cfg_string(floppy);
4612 return floppy_init();
4614 module_init(floppy_module_init);
4616 static void __exit floppy_module_exit(void)
4620 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4621 unregister_blkdev(FLOPPY_MAJOR, "fd");
4622 platform_driver_unregister(&floppy_driver);
4624 for (drive = 0; drive < N_DRIVE; drive++) {
4625 del_timer_sync(&motor_off_timer[drive]);
4627 if ((allowed_drive_mask & (1 << drive)) &&
4628 fdc_state[FDC(drive)].version != FDC_NONE) {
4629 del_gendisk(disks[drive]);
4630 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4631 platform_device_unregister(&floppy_device[drive]);
4633 put_disk(disks[drive]);
4636 del_timer_sync(&fd_timeout);
4637 del_timer_sync(&fd_timer);
4638 blk_cleanup_queue(floppy_queue);
4641 floppy_release_irq_and_dma();
4643 /* eject disk, if any */
4647 module_exit(floppy_module_exit);
4649 module_param(floppy, charp, 0);
4650 module_param(FLOPPY_IRQ, int, 0);
4651 module_param(FLOPPY_DMA, int, 0);
4652 MODULE_AUTHOR("Alain L. Knaff");
4653 MODULE_SUPPORTED_DEVICE("fd");
4654 MODULE_LICENSE("GPL");
4656 /* This doesn't actually get used other than for module information */
4657 static const struct pnp_device_id floppy_pnpids[] = {
4662 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4666 __setup("floppy=", floppy_setup);
4667 module_init(floppy_init)
4670 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);