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 */
156 #define debug_dcl(test, fmt, args...) \
157 do { if ((test) & FD_DEBUG) DPRINT(fmt, ##args); } while (0)
159 #define debug_dcl(test, fmt, args...) \
160 do { if (0) DPRINT(fmt, ##args); } while (0)
164 /* do print messages for unexpected interrupts */
165 static int print_unex = 1;
166 #include <linux/module.h>
167 #include <linux/sched.h>
168 #include <linux/fs.h>
169 #include <linux/kernel.h>
170 #include <linux/timer.h>
171 #include <linux/workqueue.h>
173 #include <linux/fdreg.h>
174 #include <linux/fd.h>
175 #include <linux/hdreg.h>
176 #include <linux/errno.h>
177 #include <linux/slab.h>
178 #include <linux/mm.h>
179 #include <linux/bio.h>
180 #include <linux/string.h>
181 #include <linux/jiffies.h>
182 #include <linux/fcntl.h>
183 #include <linux/delay.h>
184 #include <linux/mc146818rtc.h> /* CMOS defines */
185 #include <linux/ioport.h>
186 #include <linux/interrupt.h>
187 #include <linux/init.h>
188 #include <linux/platform_device.h>
189 #include <linux/mod_devicetable.h>
190 #include <linux/buffer_head.h> /* for invalidate_buffers() */
191 #include <linux/mutex.h>
192 #include <linux/io.h>
193 #include <linux/uaccess.h>
196 * PS/2 floppies have much slower step rates than regular floppies.
197 * It's been recommended that take about 1/4 of the default speed
198 * in some more extreme cases.
200 static int slow_floppy;
204 #include <asm/system.h>
206 static int FLOPPY_IRQ = 6;
207 static int FLOPPY_DMA = 2;
208 static int can_use_virtual_dma = 2;
210 * can use virtual DMA:
211 * 0 = use of virtual DMA disallowed by config
212 * 1 = use of virtual DMA prescribed by config
213 * 2 = no virtual DMA preference configured. By default try hard DMA,
214 * but fall back on virtual DMA when not enough memory available
217 static int use_virtual_dma;
221 * 1 using virtual DMA
222 * This variable is set to virtual when a DMA mem problem arises, and
223 * reset back in floppy_grab_irq_and_dma.
224 * It is not safe to reset it in other circumstances, because the floppy
225 * driver may have several buffers in use at once, and we do currently not
226 * record each buffers capabilities
229 static DEFINE_SPINLOCK(floppy_lock);
231 static unsigned short virtual_dma_port = 0x3f0;
232 irqreturn_t floppy_interrupt(int irq, void *dev_id);
233 static int set_dor(int fdc, char mask, char data);
235 #define K_64 0x10000 /* 64KB */
237 /* the following is the mask of allowed drives. By default units 2 and
238 * 3 of both floppy controllers are disabled, because switching on the
239 * motor of these drives causes system hangs on some PCI computers. drive
240 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
241 * a drive is allowed.
243 * NOTE: This must come before we include the arch floppy header because
244 * some ports reference this variable from there. -DaveM
247 static int allowed_drive_mask = 0x33;
249 #include <asm/floppy.h>
251 static int irqdma_allocated;
253 #include <linux/blkdev.h>
254 #include <linux/blkpg.h>
255 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
256 #include <linux/completion.h>
258 static struct request *current_req;
259 static struct request_queue *floppy_queue;
260 static void do_fd_request(struct request_queue *q);
262 #ifndef fd_get_dma_residue
263 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
266 /* Dma Memory related stuff */
268 #ifndef fd_dma_mem_free
269 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
272 #ifndef fd_dma_mem_alloc
273 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL, get_order(size))
276 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
278 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
280 return; /* we have the memory */
281 if (can_use_virtual_dma != 2)
282 return; /* no fallback allowed */
283 pr_info("DMA memory shortage. Temporarily falling back on virtual DMA\n");
284 *addr = (char *)nodma_mem_alloc(l);
290 /* End dma memory related stuff */
292 static unsigned long fake_change;
293 static bool initialized;
295 #define ITYPE(x) (((x) >> 2) & 0x1f)
296 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
297 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
298 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
299 /* reverse mapping from unit and fdc to drive */
300 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
302 #define DP (&drive_params[current_drive])
303 #define DRS (&drive_state[current_drive])
304 #define DRWE (&write_errors[current_drive])
305 #define FDCS (&fdc_state[fdc])
307 #define UDP (&drive_params[drive])
308 #define UDRS (&drive_state[drive])
309 #define UDRWE (&write_errors[drive])
310 #define UFDCS (&fdc_state[FDC(drive)])
312 #define DPRINT(format, args...) \
313 pr_info("floppy%d: " format, current_drive, ##args)
315 #define PH_HEAD(floppy, head) (((((floppy)->stretch & 2) >> 1) ^ head) << 2)
316 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
319 #define COMMAND (raw_cmd->cmd[0])
320 #define DR_SELECT (raw_cmd->cmd[1])
321 #define TRACK (raw_cmd->cmd[2])
322 #define HEAD (raw_cmd->cmd[3])
323 #define SECTOR (raw_cmd->cmd[4])
324 #define SIZECODE (raw_cmd->cmd[5])
325 #define SECT_PER_TRACK (raw_cmd->cmd[6])
326 #define GAP (raw_cmd->cmd[7])
327 #define SIZECODE2 (raw_cmd->cmd[8])
331 #define F_SIZECODE (raw_cmd->cmd[2])
332 #define F_SECT_PER_TRACK (raw_cmd->cmd[3])
333 #define F_GAP (raw_cmd->cmd[4])
334 #define F_FILL (raw_cmd->cmd[5])
338 * Maximum disk size (in kilobytes).
339 * This default is used whenever the current disk size is unknown.
340 * [Now it is rather a minimum]
342 #define MAX_DISK_SIZE 4 /* 3984 */
345 * globals used by 'result()'
347 #define MAX_REPLIES 16
348 static unsigned char reply_buffer[MAX_REPLIES];
349 static int inr; /* size of reply buffer, when called from interrupt */
350 #define ST0 (reply_buffer[0])
351 #define ST1 (reply_buffer[1])
352 #define ST2 (reply_buffer[2])
353 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
354 #define R_TRACK (reply_buffer[3])
355 #define R_HEAD (reply_buffer[4])
356 #define R_SECTOR (reply_buffer[5])
357 #define R_SIZECODE (reply_buffer[6])
359 #define SEL_DLY (2 * HZ / 100)
362 * this struct defines the different floppy drive types.
365 struct floppy_drive_params params;
366 const char *name; /* name printed while booting */
367 } default_drive_params[] = {
368 /* NOTE: the time values in jiffies should be in msec!
370 | Maximum data rate supported by drive type
371 | | Head load time, msec
372 | | | Head unload time, msec (not used)
373 | | | | Step rate interval, usec
374 | | | | | Time needed for spinup time (jiffies)
375 | | | | | | Timeout for spinning down (jiffies)
376 | | | | | | | Spindown offset (where disk stops)
377 | | | | | | | | Select delay
378 | | | | | | | | | RPS
379 | | | | | | | | | | Max number of tracks
380 | | | | | | | | | | | Interrupt timeout
381 | | | | | | | | | | | | Max nonintlv. sectors
382 | | | | | | | | | | | | | -Max Errors- flags */
383 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
384 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
386 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
387 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
389 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
390 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
392 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
393 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
395 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
396 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
398 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
399 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
401 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
402 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
403 /* | --autodetected formats--- | | |
404 * read_track | | Name printed when booting
406 * Frequency of disk change checks */
409 static struct floppy_drive_params drive_params[N_DRIVE];
410 static struct floppy_drive_struct drive_state[N_DRIVE];
411 static struct floppy_write_errors write_errors[N_DRIVE];
412 static struct timer_list motor_off_timer[N_DRIVE];
413 static struct gendisk *disks[N_DRIVE];
414 static struct block_device *opened_bdev[N_DRIVE];
415 static DEFINE_MUTEX(open_lock);
416 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
419 * This struct defines the different floppy types.
421 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
422 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
423 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
424 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
425 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
426 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
427 * side 0 is on physical side 0 (but with the misnamed sector IDs).
428 * 'stretch' should probably be renamed to something more general, like
431 * Bits 2 through 9 of 'stretch' tell the number of the first sector.
432 * The LSB (bit 2) is flipped. For most disks, the first sector
433 * is 1 (represented by 0x00<<2). For some CP/M and music sampler
434 * disks (such as Ensoniq EPS 16plus) it is 0 (represented as 0x01<<2).
435 * For Amstrad CPC disks it is 0xC1 (represented as 0xC0<<2).
437 * Other parameters should be self-explanatory (see also setfdprm(8)).
446 | | | | | | Data rate, | 0x40 for perp
447 | | | | | | | Spec1 (stepping rate, head unload
448 | | | | | | | | /fmt gap (gap2) */
449 static struct floppy_struct floppy_type[32] = {
450 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
451 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
452 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
453 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
454 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
455 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
456 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
457 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
458 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
459 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
461 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
462 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
463 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
464 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
465 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
466 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
467 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
468 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
469 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
470 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
472 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
473 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
474 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
475 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
476 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
477 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
478 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
479 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
480 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
481 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
483 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
484 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
487 #define SECTSIZE (_FD_SECTSIZE(*floppy))
489 /* Auto-detection: Disk type used until the next media change occurs. */
490 static struct floppy_struct *current_type[N_DRIVE];
493 * User-provided type information. current_type points to
494 * the respective entry of this array.
496 static struct floppy_struct user_params[N_DRIVE];
498 static sector_t floppy_sizes[256];
500 static char floppy_device_name[] = "floppy";
503 * The driver is trying to determine the correct media format
504 * while probing is set. rw_interrupt() clears it after a
509 /* Synchronization of FDC access. */
510 #define FD_COMMAND_NONE -1
511 #define FD_COMMAND_ERROR 2
512 #define FD_COMMAND_OKAY 3
514 static volatile int command_status = FD_COMMAND_NONE;
515 static unsigned long fdc_busy;
516 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
517 static DECLARE_WAIT_QUEUE_HEAD(command_done);
519 #define NO_SIGNAL (!interruptible || !signal_pending(current))
521 /* Errors during formatting are counted here. */
522 static int format_errors;
524 /* Format request descriptor. */
525 static struct format_descr format_req;
528 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
529 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
530 * H is head unload time (1=16ms, 2=32ms, etc)
535 * Because these are written to by the DMA controller, they must
536 * not contain a 64k byte boundary crossing, or data will be
539 static char *floppy_track_buffer;
540 static int max_buffer_sectors;
543 typedef void (*done_f)(int);
544 static struct cont_t {
545 void (*interrupt)(void);
546 /* this is called after the interrupt of the
548 void (*redo)(void); /* this is called to retry the operation */
549 void (*error)(void); /* this is called to tally an error */
550 done_f done; /* this is called to say if the operation has
551 * succeeded/failed */
554 static void floppy_ready(void);
555 static void floppy_start(void);
556 static void process_fd_request(void);
557 static void recalibrate_floppy(void);
558 static void floppy_shutdown(unsigned long);
560 static int floppy_request_regions(int);
561 static void floppy_release_regions(int);
562 static int floppy_grab_irq_and_dma(void);
563 static void floppy_release_irq_and_dma(void);
566 * The "reset" variable should be tested whenever an interrupt is scheduled,
567 * after the commands have been sent. This is to ensure that the driver doesn't
568 * get wedged when the interrupt doesn't come because of a failed command.
569 * reset doesn't need to be tested before sending commands, because
570 * output_byte is automatically disabled when reset is set.
572 static void reset_fdc(void);
575 * These are global variables, as that's the easiest way to give
576 * information to interrupts. They are the data used for the current
580 #define NEED_1_RECAL -2
581 #define NEED_2_RECAL -3
583 static int usage_count;
585 /* buffer related variables */
586 static int buffer_track = -1;
587 static int buffer_drive = -1;
588 static int buffer_min = -1;
589 static int buffer_max = -1;
591 /* fdc related variables, should end up in a struct */
592 static struct floppy_fdc_state fdc_state[N_FDC];
593 static int fdc; /* current fdc */
595 static struct floppy_struct *_floppy = floppy_type;
596 static unsigned char current_drive;
597 static long current_count_sectors;
598 static unsigned char fsector_t; /* sector in track */
599 static unsigned char in_sector_offset; /* offset within physical sector,
600 * expressed in units of 512 bytes */
603 static inline int fd_eject(int drive)
614 static long unsigned debugtimer;
616 static inline void set_debugt(void)
618 debugtimer = jiffies;
621 static inline void debugt(const char *message)
623 if (DP->flags & DEBUGT)
624 pr_info("%s dtime=%lu\n", message, jiffies - debugtimer);
627 static inline void set_debugt(void) { }
628 static inline void debugt(const char *message) { }
631 typedef void (*timeout_fn)(unsigned long);
632 static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
634 static const char *timeout_message;
636 #ifdef FLOPPY_SANITY_CHECK
637 static void is_alive(const char *message)
639 /* this routine checks whether the floppy driver is "alive" */
640 if (test_bit(0, &fdc_busy) && command_status < 2 &&
641 !timer_pending(&fd_timeout)) {
642 DPRINT("timeout handler died: %s\n", message);
647 static void (*do_floppy)(void) = NULL;
649 #ifdef FLOPPY_SANITY_CHECK
653 static void (*lasthandler)(void);
654 static unsigned long interruptjiffies;
655 static unsigned long resultjiffies;
656 static int resultsize;
657 static unsigned long lastredo;
659 static struct output_log {
661 unsigned char status;
662 unsigned long jiffies;
663 } output_log[OLOGSIZE];
665 static int output_log_pos;
668 #define current_reqD -1
669 #define MAXTIMEOUT -2
671 static void __reschedule_timeout(int drive, const char *message, int marg)
673 if (drive == current_reqD)
674 drive = current_drive;
675 del_timer(&fd_timeout);
676 if (drive < 0 || drive >= N_DRIVE) {
677 fd_timeout.expires = jiffies + 20UL * HZ;
680 fd_timeout.expires = jiffies + UDP->timeout;
681 add_timer(&fd_timeout);
682 if (UDP->flags & FD_DEBUG)
683 DPRINT("reschedule timeout %s %d\n", message, marg);
684 timeout_message = message;
687 static void reschedule_timeout(int drive, const char *message, int marg)
691 spin_lock_irqsave(&floppy_lock, flags);
692 __reschedule_timeout(drive, message, marg);
693 spin_unlock_irqrestore(&floppy_lock, flags);
696 #define INFBOUND(a, b) (a) = max_t(int, a, b)
697 #define SUPBOUND(a, b) (a) = min_t(int, a, b)
700 * Bottom half floppy driver.
701 * ==========================
703 * This part of the file contains the code talking directly to the hardware,
704 * and also the main service loop (seek-configure-spinup-command)
709 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
710 * and the last_checked date.
712 * last_checked is the date of the last check which showed 'no disk change'
713 * FD_DISK_CHANGE is set under two conditions:
714 * 1. The floppy has been changed after some i/o to that floppy already
716 * 2. No floppy disk is in the drive. This is done in order to ensure that
717 * requests are quickly flushed in case there is no disk in the drive. It
718 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
721 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
722 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
723 * each seek. If a disk is present, the disk change line should also be
724 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
725 * change line is set, this means either that no disk is in the drive, or
726 * that it has been removed since the last seek.
728 * This means that we really have a third possibility too:
729 * The floppy has been changed after the last seek.
732 static int disk_change(int drive)
734 int fdc = FDC(drive);
736 #ifdef FLOPPY_SANITY_CHECK
737 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
738 DPRINT("WARNING disk change called early\n");
739 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
740 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
741 DPRINT("probing disk change on unselected drive\n");
742 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
743 (unsigned int)FDCS->dor);
747 debug_dcl(UDP->flags,
748 "checking disk change line for drive %d\n", drive);
749 debug_dcl(UDP->flags, "jiffies=%lu\n", jiffies);
750 debug_dcl(UDP->flags, "disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
751 debug_dcl(UDP->flags, "flags=%lx\n", UDRS->flags);
753 if (UDP->flags & FD_BROKEN_DCL)
754 return test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
755 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
756 set_bit(FD_VERIFY_BIT, &UDRS->flags);
757 /* verify write protection */
759 if (UDRS->maxblock) /* mark it changed */
760 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
762 /* invalidate its geometry */
763 if (UDRS->keep_data >= 0) {
764 if ((UDP->flags & FTD_MSG) &&
765 current_type[drive] != NULL)
766 DPRINT("Disk type is undefined after "
768 current_type[drive] = NULL;
769 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
774 UDRS->last_checked = jiffies;
775 clear_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
780 static inline int is_selected(int dor, int unit)
782 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
785 static bool is_ready_state(int status)
787 int state = status & (STATUS_READY | STATUS_DIR | STATUS_DMA);
788 return state == STATUS_READY;
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);
807 debug_dcl(UDP->flags,
808 "calling disk change from set_dor\n");
812 fd_outb(newdor, FD_DOR);
815 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
816 drive = REVDRIVE(fdc, unit);
817 UDRS->select_date = jiffies;
823 static void twaddle(void)
825 if (DP->select_delay)
827 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
828 fd_outb(FDCS->dor, FD_DOR);
829 DRS->select_date = jiffies;
833 * Reset all driver information about the current fdc.
834 * This is needed after 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, bool 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)
1023 debug_dcl(DP->flags, "calling disk change from watchdog\n");
1025 if (disk_change(current_drive)) {
1026 DPRINT("disk removed during i/o\n");
1031 del_timer(&fd_timer);
1032 fd_timer.function = (timeout_fn)fd_watchdog;
1033 fd_timer.expires = jiffies + HZ / 10;
1034 add_timer(&fd_timer);
1038 static void main_command_interrupt(void)
1040 del_timer(&fd_timer);
1044 /* waits for a delay (spinup or select) to pass */
1045 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1048 reset_fdc(); /* do the reset during sleep to win time
1049 * if we don't need to sleep, it's a good
1050 * occasion anyways */
1054 if (time_before(jiffies, delay)) {
1055 del_timer(&fd_timer);
1056 fd_timer.function = function;
1057 fd_timer.expires = delay;
1058 add_timer(&fd_timer);
1064 static DEFINE_SPINLOCK(floppy_hlt_lock);
1065 static int hlt_disabled;
1066 static void floppy_disable_hlt(void)
1068 unsigned long flags;
1070 spin_lock_irqsave(&floppy_hlt_lock, flags);
1071 if (!hlt_disabled) {
1073 #ifdef HAVE_DISABLE_HLT
1077 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1080 static void floppy_enable_hlt(void)
1082 unsigned long flags;
1084 spin_lock_irqsave(&floppy_hlt_lock, flags);
1087 #ifdef HAVE_DISABLE_HLT
1091 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1094 static void setup_DMA(void)
1098 #ifdef FLOPPY_SANITY_CHECK
1099 if (raw_cmd->length == 0) {
1102 pr_info("zero dma transfer size:");
1103 for (i = 0; i < raw_cmd->cmd_count; i++)
1104 pr_cont("%x,", raw_cmd->cmd[i]);
1110 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1111 pr_info("non aligned address: %p\n", raw_cmd->kernel_data);
1117 f = claim_dma_lock();
1120 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1121 (raw_cmd->flags & FD_RAW_READ) ?
1122 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1123 release_dma_lock(f);
1128 release_dma_lock(f);
1131 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1132 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1133 DMA_MODE_READ : DMA_MODE_WRITE);
1134 fd_set_dma_addr(raw_cmd->kernel_data);
1135 fd_set_dma_count(raw_cmd->length);
1136 virtual_dma_port = FDCS->address;
1138 release_dma_lock(f);
1140 floppy_disable_hlt();
1143 static void show_floppy(void);
1145 /* waits until the fdc becomes ready */
1146 static int wait_til_ready(void)
1153 for (counter = 0; counter < 10000; counter++) {
1154 status = fd_inb(FD_STATUS);
1155 if (status & STATUS_READY)
1159 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1166 /* sends a command byte to the fdc */
1167 static int output_byte(char byte)
1169 int status = wait_til_ready();
1174 if (is_ready_state(status)) {
1175 fd_outb(byte, FD_DATA);
1176 #ifdef FLOPPY_SANITY_CHECK
1177 output_log[output_log_pos].data = byte;
1178 output_log[output_log_pos].status = status;
1179 output_log[output_log_pos].jiffies = jiffies;
1180 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1186 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1193 /* gets the response from the fdc */
1194 static int result(void)
1199 for (i = 0; i < MAX_REPLIES; i++) {
1200 status = wait_til_ready();
1203 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1204 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1205 #ifdef FLOPPY_SANITY_CHECK
1206 resultjiffies = jiffies;
1211 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1212 reply_buffer[i] = fd_inb(FD_DATA);
1217 DPRINT("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1225 #define MORE_OUTPUT -2
1226 /* does the fdc need more output? */
1227 static int need_more_output(void)
1229 int status = wait_til_ready();
1234 if (is_ready_state(status))
1240 /* Set perpendicular mode as required, based on data rate, if supported.
1241 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1243 static inline void perpendicular_mode(void)
1245 unsigned char perp_mode;
1247 if (raw_cmd->rate & 0x40) {
1248 switch (raw_cmd->rate & 3) {
1256 DPRINT("Invalid data rate for perpendicular mode!\n");
1260 * convenient way to return to
1261 * redo without too much hassle
1262 * (deep stack et al.)
1269 if (FDCS->perp_mode == perp_mode)
1271 if (FDCS->version >= FDC_82077_ORIG) {
1272 output_byte(FD_PERPENDICULAR);
1273 output_byte(perp_mode);
1274 FDCS->perp_mode = perp_mode;
1275 } else if (perp_mode) {
1276 DPRINT("perpendicular mode not supported by this FDC.\n");
1278 } /* perpendicular_mode */
1280 static int fifo_depth = 0xa;
1283 static int fdc_configure(void)
1286 output_byte(FD_CONFIGURE);
1287 if (need_more_output() != MORE_OUTPUT)
1290 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1291 output_byte(0); /* pre-compensation from track
1296 #define NOMINAL_DTR 500
1298 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1299 * head load time, and DMA disable flag to values needed by floppy.
1301 * The value "dtr" is the data transfer rate in Kbps. It is needed
1302 * to account for the data rate-based scaling done by the 82072 and 82077
1303 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1306 * Note that changing the data transfer rate has a (probably deleterious)
1307 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1308 * fdc_specify is called again after each data transfer rate
1311 * srt: 1000 to 16000 in microseconds
1312 * hut: 16 to 240 milliseconds
1313 * hlt: 2 to 254 milliseconds
1315 * These values are rounded up to the next highest available delay time.
1317 static void fdc_specify(void)
1319 unsigned char spec1;
1320 unsigned char spec2;
1324 unsigned long dtr = NOMINAL_DTR;
1325 unsigned long scale_dtr = NOMINAL_DTR;
1326 int hlt_max_code = 0x7f;
1327 int hut_max_code = 0xf;
1329 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1331 FDCS->need_configure = 0;
1334 switch (raw_cmd->rate & 0x03) {
1340 if (FDCS->version >= FDC_82078) {
1341 /* chose the default rate table, not the one
1342 * where 1 = 2 Mbps */
1343 output_byte(FD_DRIVESPEC);
1344 if (need_more_output() == MORE_OUTPUT) {
1345 output_byte(UNIT(current_drive));
1355 if (FDCS->version >= FDC_82072) {
1357 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1358 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1361 /* Convert step rate from microseconds to milliseconds and 4 bits */
1362 srt = 16 - DIV_ROUND_UP(DP->srt * scale_dtr / 1000, NOMINAL_DTR);
1369 hlt = DIV_ROUND_UP(DP->hlt * scale_dtr / 2, NOMINAL_DTR);
1372 else if (hlt > 0x7f)
1375 hut = DIV_ROUND_UP(DP->hut * scale_dtr / 16, NOMINAL_DTR);
1381 spec1 = (srt << 4) | hut;
1382 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1384 /* If these parameters did not change, just return with success */
1385 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1386 /* Go ahead and set spec1 and spec2 */
1387 output_byte(FD_SPECIFY);
1388 output_byte(FDCS->spec1 = spec1);
1389 output_byte(FDCS->spec2 = spec2);
1393 /* Set the FDC's data transfer rate on behalf of the specified drive.
1394 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1395 * of the specify command (i.e. using the fdc_specify function).
1397 static int fdc_dtr(void)
1399 /* If data rate not already set to desired value, set it. */
1400 if ((raw_cmd->rate & 3) == FDCS->dtr)
1404 fd_outb(raw_cmd->rate & 3, FD_DCR);
1406 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1407 * need a stabilization period of several milliseconds to be
1408 * enforced after data rate changes before R/W operations.
1409 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1411 FDCS->dtr = raw_cmd->rate & 3;
1412 return fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1413 (timeout_fn)floppy_ready);
1416 static void tell_sector(void)
1418 pr_cont(": track %d, head %d, sector %d, size %d",
1419 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1422 static void print_errors(void)
1425 if (ST0 & ST0_ECE) {
1426 pr_cont("Recalibrate failed!");
1427 } else if (ST2 & ST2_CRC) {
1428 pr_cont("data CRC error");
1430 } else if (ST1 & ST1_CRC) {
1431 pr_cont("CRC error");
1433 } else if ((ST1 & (ST1_MAM | ST1_ND)) ||
1436 pr_cont("sector not found");
1439 pr_cont("probe failed...");
1440 } else if (ST2 & ST2_WC) { /* seek error */
1441 pr_cont("wrong cylinder");
1442 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1443 pr_cont("bad cylinder");
1445 pr_cont("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1453 * OK, this error interpreting routine is called after a
1454 * DMA read/write has succeeded
1455 * or failed, so we check the results, and copy any buffers.
1456 * hhb: Added better error reporting.
1457 * ak: Made this into a separate routine.
1459 static int interpret_errors(void)
1464 DPRINT("-- FDC reply error");
1469 /* check IC to find cause of interrupt */
1470 switch (ST0 & ST0_INTR) {
1471 case 0x40: /* error occurred during command execution */
1473 return 0; /* occurs with pseudo-DMA */
1476 DPRINT("Drive is write protected\n");
1477 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1480 } else if (ST1 & ST1_ND) {
1481 set_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1482 } else if (ST1 & ST1_OR) {
1483 if (DP->flags & FTD_MSG)
1484 DPRINT("Over/Underrun - retrying\n");
1486 } else if (*errors >= DP->max_errors.reporting) {
1489 if (ST2 & ST2_WC || ST2 & ST2_BC)
1490 /* wrong cylinder => recal */
1491 DRS->track = NEED_2_RECAL;
1493 case 0x80: /* invalid command given */
1494 DPRINT("Invalid FDC command given!\n");
1498 DPRINT("Abnormal termination caused by polling\n");
1501 default: /* (0) Normal command termination */
1507 * This routine is called when everything should be correctly set up
1508 * for the transfer (i.e. floppy motor is on, the correct floppy is
1509 * selected, and the head is sitting on the right track).
1511 static void setup_rw_floppy(void)
1517 unsigned long ready_date;
1518 timeout_fn function;
1520 flags = raw_cmd->flags;
1521 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1522 flags |= FD_RAW_INTR;
1524 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1525 ready_date = DRS->spinup_date + DP->spinup;
1526 /* If spinup will take a long time, rerun scandrives
1527 * again just before spinup completion. Beware that
1528 * after scandrives, we must again wait for selection.
1530 if (time_after(ready_date, jiffies + DP->select_delay)) {
1531 ready_date -= DP->select_delay;
1532 function = (timeout_fn)floppy_start;
1534 function = (timeout_fn)setup_rw_floppy;
1536 /* wait until the floppy is spinning fast enough */
1537 if (fd_wait_for_completion(ready_date, function))
1540 dflags = DRS->flags;
1542 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1545 if (flags & FD_RAW_INTR)
1546 do_floppy = main_command_interrupt;
1549 for (i = 0; i < raw_cmd->cmd_count; i++)
1550 r |= output_byte(raw_cmd->cmd[i]);
1552 debugt("rw_command: ");
1560 if (!(flags & FD_RAW_INTR)) {
1563 } else if (flags & FD_RAW_NEED_DISK)
1567 static int blind_seek;
1570 * This is the routine called after every seek (or recalibrate) interrupt
1571 * from the floppy controller.
1573 static void seek_interrupt(void)
1575 debugt("seek interrupt:");
1576 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1577 DPRINT("seek failed\n");
1578 DRS->track = NEED_2_RECAL;
1583 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1584 debug_dcl(DP->flags,
1585 "clearing NEWCHANGE flag because of effective seek\n");
1586 debug_dcl(DP->flags, "jiffies=%lu\n", jiffies);
1587 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1588 /* effective seek */
1589 DRS->select_date = jiffies;
1595 static void check_wp(void)
1597 if (test_bit(FD_VERIFY_BIT, &DRS->flags)) {
1598 /* check write protection */
1599 output_byte(FD_GETSTATUS);
1600 output_byte(UNIT(current_drive));
1601 if (result() != 1) {
1605 clear_bit(FD_VERIFY_BIT, &DRS->flags);
1606 clear_bit(FD_NEED_TWADDLE_BIT, &DRS->flags);
1607 debug_dcl(DP->flags,
1608 "checking whether disk is write protected\n");
1609 debug_dcl(DP->flags, "wp=%x\n", ST3 & 0x40);
1611 set_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1613 clear_bit(FD_DISK_WRITABLE_BIT, &DRS->flags);
1617 static void seek_floppy(void)
1623 debug_dcl(DP->flags, "calling disk change from seek\n");
1625 if (!test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1626 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1627 /* the media changed flag should be cleared after the seek.
1628 * If it isn't, this means that there is really no disk in
1631 set_bit(FD_DISK_CHANGED_BIT, &DRS->flags);
1636 if (DRS->track <= NEED_1_RECAL) {
1637 recalibrate_floppy();
1639 } else if (test_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags) &&
1640 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1641 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1642 /* we seek to clear the media-changed condition. Does anybody
1643 * know a more elegant way, which works on all drives? */
1645 track = raw_cmd->track - 1;
1647 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1648 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1650 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1656 if (raw_cmd->track != DRS->track &&
1657 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1658 track = raw_cmd->track;
1665 do_floppy = seek_interrupt;
1666 output_byte(FD_SEEK);
1667 output_byte(UNIT(current_drive));
1668 if (output_byte(track) < 0) {
1672 debugt("seek command:");
1675 static void recal_interrupt(void)
1677 debugt("recal interrupt:");
1680 else if (ST0 & ST0_ECE) {
1681 switch (DRS->track) {
1683 debugt("recal interrupt need 1 recal:");
1684 /* after a second recalibrate, we still haven't
1685 * reached track 0. Probably no drive. Raise an
1686 * error, as failing immediately might upset
1687 * computers possessed by the Devil :-) */
1692 debugt("recal interrupt need 2 recal:");
1693 /* If we already did a recalibrate,
1694 * and we are not at track 0, this
1695 * means we have moved. (The only way
1696 * not to move at recalibration is to
1697 * be already at track 0.) Clear the
1698 * new change flag */
1699 debug_dcl(DP->flags,
1700 "clearing NEWCHANGE flag because of second recalibrate\n");
1702 clear_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1703 DRS->select_date = jiffies;
1706 debugt("recal interrupt default:");
1707 /* Recalibrate moves the head by at
1708 * most 80 steps. If after one
1709 * recalibrate we don't have reached
1710 * track 0, this might mean that we
1711 * started beyond track 80. Try
1713 DRS->track = NEED_1_RECAL;
1721 static void print_result(char *message, int inr)
1725 DPRINT("%s ", message);
1727 for (i = 0; i < inr; i++)
1728 pr_cont("repl[%d]=%x ", i, reply_buffer[i]);
1732 /* interrupt handler. Note that this can be called externally on the Sparc */
1733 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1737 void (*handler)(void) = do_floppy;
1739 lasthandler = handler;
1740 interruptjiffies = jiffies;
1742 f = claim_dma_lock();
1744 release_dma_lock(f);
1746 floppy_enable_hlt();
1748 if (fdc >= N_FDC || FDCS->address == -1) {
1749 /* we don't even know which FDC is the culprit */
1750 pr_info("DOR0=%x\n", fdc_state[0].dor);
1751 pr_info("floppy interrupt on bizarre fdc %d\n", fdc);
1752 pr_info("handler=%p\n", handler);
1753 is_alive("bizarre fdc");
1758 /* We have to clear the reset flag here, because apparently on boxes
1759 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1760 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1761 * emission of the SENSEI's.
1762 * It is OK to emit floppy commands because we are in an interrupt
1763 * handler here, and thus we have to fear no interference of other
1767 do_print = !handler && print_unex && initialized;
1771 print_result("unexpected interrupt", inr);
1775 output_byte(FD_SENSEI);
1778 print_result("sensei", inr);
1780 } while ((ST0 & 0x83) != UNIT(current_drive) &&
1781 inr == 2 && max_sensei);
1787 schedule_bh(handler);
1788 is_alive("normal interrupt end");
1790 /* FIXME! Was it really for us? */
1794 static void recalibrate_floppy(void)
1796 debugt("recalibrate floppy:");
1797 do_floppy = recal_interrupt;
1798 output_byte(FD_RECALIBRATE);
1799 if (output_byte(UNIT(current_drive)) < 0) {
1806 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1808 static void reset_interrupt(void)
1810 debugt("reset interrupt:");
1811 result(); /* get the status ready for set_fdc */
1813 pr_info("reset set in interrupt, calling %p\n", cont->error);
1814 cont->error(); /* a reset just after a reset. BAD! */
1820 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1821 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1823 static void reset_fdc(void)
1825 unsigned long flags;
1827 do_floppy = reset_interrupt;
1831 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1832 /* Irrelevant for systems with true DMA (i386). */
1834 flags = claim_dma_lock();
1836 release_dma_lock(flags);
1838 if (FDCS->version >= FDC_82072A)
1839 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1841 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1842 udelay(FD_RESET_DELAY);
1843 fd_outb(FDCS->dor, FD_DOR);
1847 static void show_floppy(void)
1852 pr_info("floppy driver state\n");
1853 pr_info("-------------------\n");
1854 pr_info("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n",
1855 jiffies, interruptjiffies, jiffies - interruptjiffies,
1858 #ifdef FLOPPY_SANITY_CHECK
1859 pr_info("timeout_message=%s\n", timeout_message);
1860 pr_info("last output bytes:\n");
1861 for (i = 0; i < OLOGSIZE; i++)
1862 pr_info("%2x %2x %lu\n",
1863 output_log[(i + output_log_pos) % OLOGSIZE].data,
1864 output_log[(i + output_log_pos) % OLOGSIZE].status,
1865 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1866 pr_info("last result at %lu\n", resultjiffies);
1867 pr_info("last redo_fd_request at %lu\n", lastredo);
1868 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1,
1869 reply_buffer, resultsize, true);
1872 pr_info("status=%x\n", fd_inb(FD_STATUS));
1873 pr_info("fdc_busy=%lu\n", fdc_busy);
1875 pr_info("do_floppy=%p\n", do_floppy);
1876 if (work_pending(&floppy_work))
1877 pr_info("floppy_work.func=%p\n", floppy_work.func);
1878 if (timer_pending(&fd_timer))
1879 pr_info("fd_timer.function=%p\n", fd_timer.function);
1880 if (timer_pending(&fd_timeout)) {
1881 pr_info("timer_function=%p\n", fd_timeout.function);
1882 pr_info("expires=%lu\n", fd_timeout.expires - jiffies);
1883 pr_info("now=%lu\n", jiffies);
1885 pr_info("cont=%p\n", cont);
1886 pr_info("current_req=%p\n", current_req);
1887 pr_info("command_status=%d\n", command_status);
1891 static void floppy_shutdown(unsigned long data)
1893 unsigned long flags;
1899 floppy_enable_hlt();
1901 flags = claim_dma_lock();
1903 release_dma_lock(flags);
1905 /* avoid dma going to a random drive after shutdown */
1908 DPRINT("floppy timeout called\n");
1912 cont->redo(); /* this will recall reset when needed */
1914 pr_info("no cont in shutdown!\n");
1915 process_fd_request();
1917 is_alive("floppy shutdown");
1920 /* start motor, check media-changed condition and write protection */
1921 static int start_motor(void (*function)(void))
1927 data = UNIT(current_drive);
1928 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1929 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1931 /* no read since this drive is running */
1932 DRS->first_read_date = 0;
1933 /* note motor start time if motor is not yet running */
1934 DRS->spinup_date = jiffies;
1935 data |= (0x10 << UNIT(current_drive));
1937 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1938 mask &= ~(0x10 << UNIT(current_drive));
1940 /* starts motor and selects floppy */
1941 del_timer(motor_off_timer + current_drive);
1942 set_dor(fdc, mask, data);
1944 /* wait_for_completion also schedules reset if needed. */
1945 return fd_wait_for_completion(DRS->select_date + DP->select_delay,
1946 (timeout_fn)function);
1949 static void floppy_ready(void)
1955 if (start_motor(floppy_ready))
1960 debug_dcl(DP->flags, "calling disk change from floppy_ready\n");
1961 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1962 disk_change(current_drive) && !DP->select_delay)
1963 twaddle(); /* this clears the dcl on certain
1964 * drive/controller combinations */
1966 #ifdef fd_chose_dma_mode
1967 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1968 unsigned long flags = claim_dma_lock();
1969 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1970 release_dma_lock(flags);
1974 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1975 perpendicular_mode();
1976 fdc_specify(); /* must be done here because of hut, hlt ... */
1979 if ((raw_cmd->flags & FD_RAW_READ) ||
1980 (raw_cmd->flags & FD_RAW_WRITE))
1986 static void floppy_start(void)
1988 reschedule_timeout(current_reqD, "floppy start", 0);
1991 debug_dcl(DP->flags, "setting NEWCHANGE in floppy_start\n");
1992 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
1997 * ========================================================================
1998 * here ends the bottom half. Exported routines are:
1999 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
2000 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
2001 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
2003 * ========================================================================
2006 * General purpose continuations.
2007 * ==============================
2010 static void do_wakeup(void)
2012 reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
2014 command_status += 2;
2015 wake_up(&command_done);
2018 static struct cont_t wakeup_cont = {
2022 .done = (done_f)empty
2025 static struct cont_t intr_cont = {
2027 .redo = process_fd_request,
2029 .done = (done_f)empty
2032 static int wait_til_done(void (*handler)(void), bool interruptible)
2036 schedule_bh(handler);
2038 if (command_status < 2 && NO_SIGNAL) {
2039 DECLARE_WAITQUEUE(wait, current);
2041 add_wait_queue(&command_done, &wait);
2043 set_current_state(interruptible ?
2044 TASK_INTERRUPTIBLE :
2045 TASK_UNINTERRUPTIBLE);
2047 if (command_status >= 2 || !NO_SIGNAL)
2050 is_alive("wait_til_done");
2054 set_current_state(TASK_RUNNING);
2055 remove_wait_queue(&command_done, &wait);
2058 if (command_status < 2) {
2066 command_status = FD_COMMAND_ERROR;
2067 if (command_status == FD_COMMAND_OKAY)
2071 command_status = FD_COMMAND_NONE;
2075 static void generic_done(int result)
2077 command_status = result;
2078 cont = &wakeup_cont;
2081 static void generic_success(void)
2086 static void generic_failure(void)
2091 static void success_and_wakeup(void)
2098 * formatting and rw support.
2099 * ==========================
2102 static int next_valid_format(void)
2106 probed_format = DRS->probed_format;
2108 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2109 DRS->probed_format = 0;
2112 if (floppy_type[DP->autodetect[probed_format]].sect) {
2113 DRS->probed_format = probed_format;
2120 static void bad_flp_intr(void)
2125 DRS->probed_format++;
2126 if (!next_valid_format())
2129 err_count = ++(*errors);
2130 INFBOUND(DRWE->badness, err_count);
2131 if (err_count > DP->max_errors.abort)
2133 if (err_count > DP->max_errors.reset)
2135 else if (err_count > DP->max_errors.recal)
2136 DRS->track = NEED_2_RECAL;
2139 static void set_floppy(int drive)
2141 int type = ITYPE(UDRS->fd_device);
2144 _floppy = floppy_type + type;
2146 _floppy = current_type[drive];
2150 * formatting support.
2151 * ===================
2153 static void format_interrupt(void)
2155 switch (interpret_errors()) {
2166 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
2167 #define FM_MODE(x, y) ((y) & ~(((x)->rate & 0x80) >> 1))
2168 #define CT(x) ((x) | 0xc0)
2170 static void setup_format_params(int track)
2178 unsigned char track, head, sect, size;
2179 } *here = (struct fparm *)floppy_track_buffer;
2181 raw_cmd = &default_raw_cmd;
2182 raw_cmd->track = track;
2184 raw_cmd->flags = (FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2185 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK);
2186 raw_cmd->rate = _floppy->rate & 0x43;
2187 raw_cmd->cmd_count = NR_F;
2188 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2189 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2190 F_SIZECODE = FD_SIZECODE(_floppy);
2191 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2192 F_GAP = _floppy->fmt_gap;
2193 F_FILL = FD_FILL_BYTE;
2195 raw_cmd->kernel_data = floppy_track_buffer;
2196 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2198 /* allow for about 30ms for data transport per track */
2199 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2201 /* a ``cylinder'' is two tracks plus a little stepping time */
2202 track_shift = 2 * head_shift + 3;
2204 /* position of logical sector 1 on this track */
2205 n = (track_shift * format_req.track + head_shift * format_req.head)
2208 /* determine interleave */
2210 if (_floppy->fmt_gap < 0x22)
2213 /* initialize field */
2214 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2215 here[count].track = format_req.track;
2216 here[count].head = format_req.head;
2217 here[count].sect = 0;
2218 here[count].size = F_SIZECODE;
2220 /* place logical sectors */
2221 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2222 here[n].sect = count;
2223 n = (n + il) % F_SECT_PER_TRACK;
2224 if (here[n].sect) { /* sector busy, find next free sector */
2226 if (n >= F_SECT_PER_TRACK) {
2227 n -= F_SECT_PER_TRACK;
2228 while (here[n].sect)
2233 if (_floppy->stretch & FD_SECTBASEMASK) {
2234 for (count = 0; count < F_SECT_PER_TRACK; count++)
2235 here[count].sect += FD_SECTBASE(_floppy) - 1;
2239 static void redo_format(void)
2242 setup_format_params(format_req.track << STRETCH(_floppy));
2244 debugt("queue format request");
2247 static struct cont_t format_cont = {
2248 .interrupt = format_interrupt,
2249 .redo = redo_format,
2250 .error = bad_flp_intr,
2251 .done = generic_done
2254 static int do_format(int drive, struct format_descr *tmp_format_req)
2258 if (lock_fdc(drive, true))
2263 _floppy->track > DP->tracks ||
2264 tmp_format_req->track >= _floppy->track ||
2265 tmp_format_req->head >= _floppy->head ||
2266 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2267 !_floppy->fmt_gap) {
2268 process_fd_request();
2271 format_req = *tmp_format_req;
2273 cont = &format_cont;
2274 errors = &format_errors;
2275 ret = wait_til_done(redo_format, true);
2278 process_fd_request();
2283 * Buffer read/write and support
2284 * =============================
2287 static void floppy_end_request(struct request *req, int error)
2289 unsigned int nr_sectors = current_count_sectors;
2290 unsigned int drive = (unsigned long)req->rq_disk->private_data;
2292 /* current_count_sectors can be zero if transfer failed */
2294 nr_sectors = blk_rq_cur_sectors(req);
2295 if (__blk_end_request(req, error, nr_sectors << 9))
2298 /* We're done with the request */
2303 /* new request_done. Can handle physical sectors which are smaller than a
2305 static void request_done(int uptodate)
2307 struct request_queue *q = floppy_queue;
2308 struct request *req = current_req;
2309 unsigned long flags;
2313 reschedule_timeout(MAXTIMEOUT, "request done", uptodate);
2316 pr_info("floppy.c: no request in request_done\n");
2321 /* maintain values for invalidation on geometry
2323 block = current_count_sectors + blk_rq_pos(req);
2324 INFBOUND(DRS->maxblock, block);
2325 if (block > _floppy->sect)
2328 /* unlock chained buffers */
2329 spin_lock_irqsave(q->queue_lock, flags);
2330 floppy_end_request(req, 0);
2331 spin_unlock_irqrestore(q->queue_lock, flags);
2333 if (rq_data_dir(req) == WRITE) {
2334 /* record write error information */
2335 DRWE->write_errors++;
2336 if (DRWE->write_errors == 1) {
2337 DRWE->first_error_sector = blk_rq_pos(req);
2338 DRWE->first_error_generation = DRS->generation;
2340 DRWE->last_error_sector = blk_rq_pos(req);
2341 DRWE->last_error_generation = DRS->generation;
2343 spin_lock_irqsave(q->queue_lock, flags);
2344 floppy_end_request(req, -EIO);
2345 spin_unlock_irqrestore(q->queue_lock, flags);
2349 /* Interrupt handler evaluating the result of the r/w operation */
2350 static void rw_interrupt(void)
2358 /* some Toshiba floppy controllers occasionnally seem to
2359 * return bogus interrupts after read/write operations, which
2360 * can be recognized by a bad head number (>= 2) */
2364 if (!DRS->first_read_date)
2365 DRS->first_read_date = jiffies;
2380 nr_sectors = (((R_TRACK - TRACK) * heads +
2381 R_HEAD - HEAD) * SECT_PER_TRACK +
2382 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2384 #ifdef FLOPPY_SANITY_CHECK
2385 if (nr_sectors / ssize >
2386 DIV_ROUND_UP(in_sector_offset + current_count_sectors, ssize)) {
2387 DPRINT("long rw: %x instead of %lx\n",
2388 nr_sectors, current_count_sectors);
2389 pr_info("rs=%d s=%d\n", R_SECTOR, SECTOR);
2390 pr_info("rh=%d h=%d\n", R_HEAD, HEAD);
2391 pr_info("rt=%d t=%d\n", R_TRACK, TRACK);
2392 pr_info("heads=%d eoc=%d\n", heads, eoc);
2393 pr_info("spt=%d st=%d ss=%d\n",
2394 SECT_PER_TRACK, fsector_t, ssize);
2395 pr_info("in_sector_offset=%d\n", in_sector_offset);
2399 nr_sectors -= in_sector_offset;
2400 INFBOUND(nr_sectors, 0);
2401 SUPBOUND(current_count_sectors, nr_sectors);
2403 switch (interpret_errors()) {
2408 if (!current_count_sectors) {
2415 if (!current_count_sectors) {
2419 current_type[current_drive] = _floppy;
2420 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2425 if (DP->flags & FTD_MSG)
2426 DPRINT("Auto-detected floppy type %s in fd%d\n",
2427 _floppy->name, current_drive);
2428 current_type[current_drive] = _floppy;
2429 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2433 if (CT(COMMAND) != FD_READ ||
2434 raw_cmd->kernel_data == current_req->buffer) {
2435 /* transfer directly from buffer */
2437 } else if (CT(COMMAND) == FD_READ) {
2438 buffer_track = raw_cmd->track;
2439 buffer_drive = current_drive;
2440 INFBOUND(buffer_max, nr_sectors + fsector_t);
2445 /* Compute maximal contiguous buffer size. */
2446 static int buffer_chain_size(void)
2450 struct req_iterator iter;
2453 base = bio_data(current_req->bio);
2456 rq_for_each_segment(bv, current_req, iter) {
2457 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2466 /* Compute the maximal transfer size */
2467 static int transfer_size(int ssize, int max_sector, int max_size)
2469 SUPBOUND(max_sector, fsector_t + max_size);
2472 max_sector -= (max_sector % _floppy->sect) % ssize;
2474 /* transfer size, beginning not aligned */
2475 current_count_sectors = max_sector - fsector_t;
2481 * Move data from/to the track buffer to/from the buffer cache.
2483 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2485 int remaining; /* number of transferred 512-byte sectors */
2490 struct req_iterator iter;
2492 max_sector = transfer_size(ssize,
2493 min(max_sector, max_sector_2),
2494 blk_rq_sectors(current_req));
2496 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2497 buffer_max > fsector_t + blk_rq_sectors(current_req))
2498 current_count_sectors = min_t(int, buffer_max - fsector_t,
2499 blk_rq_sectors(current_req));
2501 remaining = current_count_sectors << 9;
2502 #ifdef FLOPPY_SANITY_CHECK
2503 if (remaining > blk_rq_bytes(current_req) && CT(COMMAND) == FD_WRITE) {
2504 DPRINT("in copy buffer\n");
2505 pr_info("current_count_sectors=%ld\n", current_count_sectors);
2506 pr_info("remaining=%d\n", remaining >> 9);
2507 pr_info("current_req->nr_sectors=%u\n",
2508 blk_rq_sectors(current_req));
2509 pr_info("current_req->current_nr_sectors=%u\n",
2510 blk_rq_cur_sectors(current_req));
2511 pr_info("max_sector=%d\n", max_sector);
2512 pr_info("ssize=%d\n", ssize);
2516 buffer_max = max(max_sector, buffer_max);
2518 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2520 size = blk_rq_cur_bytes(current_req);
2522 rq_for_each_segment(bv, current_req, iter) {
2527 SUPBOUND(size, remaining);
2529 buffer = page_address(bv->bv_page) + bv->bv_offset;
2530 #ifdef FLOPPY_SANITY_CHECK
2531 if (dma_buffer + size >
2532 floppy_track_buffer + (max_buffer_sectors << 10) ||
2533 dma_buffer < floppy_track_buffer) {
2534 DPRINT("buffer overrun in copy buffer %d\n",
2535 (int)((floppy_track_buffer - dma_buffer) >> 9));
2536 pr_info("fsector_t=%d buffer_min=%d\n",
2537 fsector_t, buffer_min);
2538 pr_info("current_count_sectors=%ld\n",
2539 current_count_sectors);
2540 if (CT(COMMAND) == FD_READ)
2542 if (CT(COMMAND) == FD_WRITE)
2546 if (((unsigned long)buffer) % 512)
2547 DPRINT("%p buffer not aligned\n", buffer);
2549 if (CT(COMMAND) == FD_READ)
2550 memcpy(buffer, dma_buffer, size);
2552 memcpy(dma_buffer, buffer, size);
2557 #ifdef FLOPPY_SANITY_CHECK
2560 max_sector -= remaining >> 9;
2561 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2566 /* work around a bug in pseudo DMA
2567 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2568 * sending data. Hence we need a different way to signal the
2569 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2570 * does not work with MT, hence we can only transfer one head at
2573 static void virtualdmabug_workaround(void)
2578 if (CT(COMMAND) == FD_WRITE) {
2579 COMMAND &= ~0x80; /* switch off multiple track mode */
2581 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2582 end_sector = SECTOR + hard_sectors - 1;
2583 #ifdef FLOPPY_SANITY_CHECK
2584 if (end_sector > SECT_PER_TRACK) {
2585 pr_info("too many sectors %d > %d\n",
2586 end_sector, SECT_PER_TRACK);
2590 SECT_PER_TRACK = end_sector;
2591 /* make sure SECT_PER_TRACK
2592 * points to end of transfer */
2597 * Formulate a read/write request.
2598 * this routine decides where to load the data (directly to buffer, or to
2599 * tmp floppy area), how much data to load (the size of the buffer, the whole
2600 * track, or a single sector)
2601 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2602 * allocation on the fly, it should be done here. No other part should need
2606 static int make_raw_rw_request(void)
2608 int aligned_sector_t;
2614 if (max_buffer_sectors == 0) {
2615 pr_info("VFS: Block I/O scheduled on unopened device\n");
2619 set_fdc((long)current_req->rq_disk->private_data);
2621 raw_cmd = &default_raw_cmd;
2622 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2624 raw_cmd->cmd_count = NR_RW;
2625 if (rq_data_dir(current_req) == READ) {
2626 raw_cmd->flags |= FD_RAW_READ;
2627 COMMAND = FM_MODE(_floppy, FD_READ);
2628 } else if (rq_data_dir(current_req) == WRITE) {
2629 raw_cmd->flags |= FD_RAW_WRITE;
2630 COMMAND = FM_MODE(_floppy, FD_WRITE);
2632 DPRINT("make_raw_rw_request: unknown command\n");
2636 max_sector = _floppy->sect * _floppy->head;
2638 TRACK = (int)blk_rq_pos(current_req) / max_sector;
2639 fsector_t = (int)blk_rq_pos(current_req) % max_sector;
2640 if (_floppy->track && TRACK >= _floppy->track) {
2641 if (blk_rq_cur_sectors(current_req) & 1) {
2642 current_count_sectors = 1;
2647 HEAD = fsector_t / _floppy->sect;
2649 if (((_floppy->stretch & (FD_SWAPSIDES | FD_SECTBASEMASK)) ||
2650 test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags)) &&
2651 fsector_t < _floppy->sect)
2652 max_sector = _floppy->sect;
2654 /* 2M disks have phantom sectors on the first track */
2655 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2656 max_sector = 2 * _floppy->sect / 3;
2657 if (fsector_t >= max_sector) {
2658 current_count_sectors =
2659 min_t(int, _floppy->sect - fsector_t,
2660 blk_rq_sectors(current_req));
2665 SIZECODE = FD_SIZECODE(_floppy);
2666 raw_cmd->rate = _floppy->rate & 0x43;
2667 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2674 raw_cmd->track = TRACK << STRETCH(_floppy);
2675 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2678 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2679 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2680 FD_SECTBASE(_floppy);
2682 /* tracksize describes the size which can be filled up with sectors
2685 tracksize = _floppy->sect - _floppy->sect % ssize;
2686 if (tracksize < _floppy->sect) {
2688 if (tracksize <= fsector_t % _floppy->sect)
2691 /* if we are beyond tracksize, fill up using smaller sectors */
2692 while (tracksize <= fsector_t % _floppy->sect) {
2693 while (tracksize + ssize > _floppy->sect) {
2701 max_sector = HEAD * _floppy->sect + tracksize;
2702 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2703 max_sector = _floppy->sect;
2704 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2705 /* for virtual DMA bug workaround */
2706 max_sector = _floppy->sect;
2709 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2710 aligned_sector_t = fsector_t - in_sector_offset;
2711 max_size = blk_rq_sectors(current_req);
2712 if ((raw_cmd->track == buffer_track) &&
2713 (current_drive == buffer_drive) &&
2714 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2715 /* data already in track buffer */
2716 if (CT(COMMAND) == FD_READ) {
2717 copy_buffer(1, max_sector, buffer_max);
2720 } else if (in_sector_offset || blk_rq_sectors(current_req) < ssize) {
2721 if (CT(COMMAND) == FD_WRITE) {
2722 unsigned int sectors;
2724 sectors = fsector_t + blk_rq_sectors(current_req);
2725 if (sectors > ssize && sectors < ssize + ssize)
2726 max_size = ssize + ssize;
2730 raw_cmd->flags &= ~FD_RAW_WRITE;
2731 raw_cmd->flags |= FD_RAW_READ;
2732 COMMAND = FM_MODE(_floppy, FD_READ);
2733 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2734 unsigned long dma_limit;
2735 int direct, indirect;
2738 transfer_size(ssize, max_sector,
2739 max_buffer_sectors * 2) - fsector_t;
2742 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2743 * on a 64 bit machine!
2745 max_size = buffer_chain_size();
2746 dma_limit = (MAX_DMA_ADDRESS -
2747 ((unsigned long)current_req->buffer)) >> 9;
2748 if ((unsigned long)max_size > dma_limit)
2749 max_size = dma_limit;
2750 /* 64 kb boundaries */
2751 if (CROSS_64KB(current_req->buffer, max_size << 9))
2753 ((unsigned long)current_req->buffer) %
2755 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2757 * We try to read tracks, but if we get too many errors, we
2758 * go back to reading just one sector at a time.
2760 * This means we should be able to read a sector even if there
2761 * are other bad sectors on this track.
2764 (indirect * 2 > direct * 3 &&
2765 *errors < DP->max_errors.read_track &&
2767 (DP->read_track & (1 << DRS->probed_format)))))) {
2768 max_size = blk_rq_sectors(current_req);
2770 raw_cmd->kernel_data = current_req->buffer;
2771 raw_cmd->length = current_count_sectors << 9;
2772 if (raw_cmd->length == 0) {
2773 DPRINT("zero dma transfer attempted from make_raw_request\n");
2774 DPRINT("indirect=%d direct=%d fsector_t=%d\n",
2775 indirect, direct, fsector_t);
2778 virtualdmabug_workaround();
2783 if (CT(COMMAND) == FD_READ)
2784 max_size = max_sector; /* unbounded */
2786 /* claim buffer track if needed */
2787 if (buffer_track != raw_cmd->track || /* bad track */
2788 buffer_drive != current_drive || /* bad drive */
2789 fsector_t > buffer_max ||
2790 fsector_t < buffer_min ||
2791 ((CT(COMMAND) == FD_READ ||
2792 (!in_sector_offset && blk_rq_sectors(current_req) >= ssize)) &&
2793 max_sector > 2 * max_buffer_sectors + buffer_min &&
2794 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)) {
2795 /* not enough space */
2797 buffer_drive = current_drive;
2798 buffer_max = buffer_min = aligned_sector_t;
2800 raw_cmd->kernel_data = floppy_track_buffer +
2801 ((aligned_sector_t - buffer_min) << 9);
2803 if (CT(COMMAND) == FD_WRITE) {
2804 /* copy write buffer to track buffer.
2805 * if we get here, we know that the write
2806 * is either aligned or the data already in the buffer
2807 * (buffer will be overwritten) */
2808 #ifdef FLOPPY_SANITY_CHECK
2809 if (in_sector_offset && buffer_track == -1)
2810 DPRINT("internal error offset !=0 on write\n");
2812 buffer_track = raw_cmd->track;
2813 buffer_drive = current_drive;
2814 copy_buffer(ssize, max_sector,
2815 2 * max_buffer_sectors + buffer_min);
2817 transfer_size(ssize, max_sector,
2818 2 * max_buffer_sectors + buffer_min -
2821 /* round up current_count_sectors to get dma xfer size */
2822 raw_cmd->length = in_sector_offset + current_count_sectors;
2823 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2824 raw_cmd->length <<= 9;
2825 #ifdef FLOPPY_SANITY_CHECK
2826 if ((raw_cmd->length < current_count_sectors << 9) ||
2827 (raw_cmd->kernel_data != current_req->buffer &&
2828 CT(COMMAND) == FD_WRITE &&
2829 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2830 aligned_sector_t < buffer_min)) ||
2831 raw_cmd->length % (128 << SIZECODE) ||
2832 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2833 DPRINT("fractionary current count b=%lx s=%lx\n",
2834 raw_cmd->length, current_count_sectors);
2835 if (raw_cmd->kernel_data != current_req->buffer)
2836 pr_info("addr=%d, length=%ld\n",
2837 (int)((raw_cmd->kernel_data -
2838 floppy_track_buffer) >> 9),
2839 current_count_sectors);
2840 pr_info("st=%d ast=%d mse=%d msi=%d\n",
2841 fsector_t, aligned_sector_t, max_sector, max_size);
2842 pr_info("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2843 pr_info("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2844 COMMAND, SECTOR, HEAD, TRACK);
2845 pr_info("buffer drive=%d\n", buffer_drive);
2846 pr_info("buffer track=%d\n", buffer_track);
2847 pr_info("buffer_min=%d\n", buffer_min);
2848 pr_info("buffer_max=%d\n", buffer_max);
2852 if (raw_cmd->kernel_data != current_req->buffer) {
2853 if (raw_cmd->kernel_data < floppy_track_buffer ||
2854 current_count_sectors < 0 ||
2855 raw_cmd->length < 0 ||
2856 raw_cmd->kernel_data + raw_cmd->length >
2857 floppy_track_buffer + (max_buffer_sectors << 10)) {
2858 DPRINT("buffer overrun in schedule dma\n");
2859 pr_info("fsector_t=%d buffer_min=%d current_count=%ld\n",
2860 fsector_t, buffer_min, raw_cmd->length >> 9);
2861 pr_info("current_count_sectors=%ld\n",
2862 current_count_sectors);
2863 if (CT(COMMAND) == FD_READ)
2865 if (CT(COMMAND) == FD_WRITE)
2869 } else if (raw_cmd->length > blk_rq_bytes(current_req) ||
2870 current_count_sectors > blk_rq_sectors(current_req)) {
2871 DPRINT("buffer overrun in direct transfer\n");
2873 } else if (raw_cmd->length < current_count_sectors << 9) {
2874 DPRINT("more sectors than bytes\n");
2875 pr_info("bytes=%ld\n", raw_cmd->length >> 9);
2876 pr_info("sectors=%ld\n", current_count_sectors);
2878 if (raw_cmd->length == 0) {
2879 DPRINT("zero dma transfer attempted from make_raw_request\n");
2884 virtualdmabug_workaround();
2888 static void redo_fd_request(void)
2890 #define REPEAT {request_done(0); continue; }
2895 if (current_drive < N_DRIVE)
2896 floppy_off(current_drive);
2900 struct request *req;
2902 spin_lock_irq(floppy_queue->queue_lock);
2903 req = blk_fetch_request(floppy_queue);
2904 spin_unlock_irq(floppy_queue->queue_lock);
2912 drive = (long)current_req->rq_disk->private_data;
2914 reschedule_timeout(current_reqD, "redo fd request", 0);
2917 raw_cmd = &default_raw_cmd;
2919 if (start_motor(redo_fd_request))
2921 disk_change(current_drive);
2922 if (test_bit(current_drive, &fake_change) ||
2923 test_bit(FD_DISK_CHANGED_BIT, &DRS->flags)) {
2924 DPRINT("disk absent or changed during operation\n");
2927 if (!_floppy) { /* Autodetection */
2929 DRS->probed_format = 0;
2930 if (next_valid_format()) {
2931 DPRINT("no autodetectable formats\n");
2938 floppy_type + DP->autodetect[DRS->probed_format];
2941 errors = &(current_req->errors);
2942 tmp = make_raw_rw_request();
2948 if (test_bit(FD_NEED_TWADDLE_BIT, &DRS->flags))
2950 schedule_bh(floppy_start);
2951 debugt("queue fd request");
2957 static struct cont_t rw_cont = {
2958 .interrupt = rw_interrupt,
2959 .redo = redo_fd_request,
2960 .error = bad_flp_intr,
2961 .done = request_done
2964 static void process_fd_request(void)
2967 schedule_bh(redo_fd_request);
2970 static void do_fd_request(struct request_queue *q)
2972 if (max_buffer_sectors == 0) {
2973 pr_info("VFS: do_fd_request called on non-open device\n");
2977 if (usage_count == 0) {
2978 pr_info("warning: usage count=0, current_req=%p exiting\n",
2980 pr_info("sect=%ld type=%x flags=%x\n",
2981 (long)blk_rq_pos(current_req), current_req->cmd_type,
2982 current_req->cmd_flags);
2985 if (test_bit(0, &fdc_busy)) {
2986 /* fdc busy, this new request will be treated when the
2987 current one is done */
2988 is_alive("do fd request, old request running");
2991 lock_fdc(MAXTIMEOUT, false);
2992 process_fd_request();
2993 is_alive("do fd request");
2996 static struct cont_t poll_cont = {
2997 .interrupt = success_and_wakeup,
2998 .redo = floppy_ready,
2999 .error = generic_failure,
3000 .done = generic_done
3003 static int poll_drive(bool interruptible, int flag)
3005 /* no auto-sense, just clear dcl */
3006 raw_cmd = &default_raw_cmd;
3007 raw_cmd->flags = flag;
3009 raw_cmd->cmd_count = 0;
3011 debug_dcl(DP->flags, "setting NEWCHANGE in poll_drive\n");
3012 set_bit(FD_DISK_NEWCHANGE_BIT, &DRS->flags);
3014 return wait_til_done(floppy_ready, interruptible);
3018 * User triggered reset
3019 * ====================
3022 static void reset_intr(void)
3024 pr_info("weird, reset interrupt called\n");
3027 static struct cont_t reset_cont = {
3028 .interrupt = reset_intr,
3029 .redo = success_and_wakeup,
3030 .error = generic_failure,
3031 .done = generic_done
3034 static int user_reset_fdc(int drive, int arg, bool interruptible)
3038 if (lock_fdc(drive, interruptible))
3041 if (arg == FD_RESET_ALWAYS)
3045 ret = wait_til_done(reset_fdc, interruptible);
3049 process_fd_request();
3054 * Misc Ioctl's and support
3055 * ========================
3057 static inline int fd_copyout(void __user *param, const void *address,
3060 return copy_to_user(param, address, size) ? -EFAULT : 0;
3063 static inline int fd_copyin(void __user *param, void *address,
3066 return copy_from_user(address, param, size) ? -EFAULT : 0;
3069 static inline const char *drive_name(int type, int drive)
3071 struct floppy_struct *floppy;
3074 floppy = floppy_type + type;
3076 if (UDP->native_format)
3077 floppy = floppy_type + UDP->native_format;
3082 return floppy->name;
3088 static void raw_cmd_done(int flag)
3093 raw_cmd->flags |= FD_RAW_FAILURE;
3094 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3096 raw_cmd->reply_count = inr;
3097 if (raw_cmd->reply_count > MAX_REPLIES)
3098 raw_cmd->reply_count = 0;
3099 for (i = 0; i < raw_cmd->reply_count; i++)
3100 raw_cmd->reply[i] = reply_buffer[i];
3102 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3103 unsigned long flags;
3104 flags = claim_dma_lock();
3105 raw_cmd->length = fd_get_dma_residue();
3106 release_dma_lock(flags);
3109 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3110 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3111 raw_cmd->flags |= FD_RAW_FAILURE;
3113 if (disk_change(current_drive))
3114 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3116 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3117 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3118 motor_off_callback(current_drive);
3120 if (raw_cmd->next &&
3121 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3122 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3123 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3124 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3125 raw_cmd = raw_cmd->next;
3132 static struct cont_t raw_cmd_cont = {
3133 .interrupt = success_and_wakeup,
3134 .redo = floppy_start,
3135 .error = generic_failure,
3136 .done = raw_cmd_done
3139 static inline int raw_cmd_copyout(int cmd, char __user *param,
3140 struct floppy_raw_cmd *ptr)
3145 ret = copy_to_user((void __user *)param, ptr, sizeof(*ptr));
3148 param += sizeof(struct floppy_raw_cmd);
3149 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3150 if (ptr->length >= 0 &&
3151 ptr->length <= ptr->buffer_length) {
3152 long length = ptr->buffer_length - ptr->length;
3153 ret = fd_copyout(ptr->data, ptr->kernel_data,
3164 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3166 struct floppy_raw_cmd *next;
3167 struct floppy_raw_cmd *this;
3172 if (this->buffer_length) {
3173 fd_dma_mem_free((unsigned long)this->kernel_data,
3174 this->buffer_length);
3175 this->buffer_length = 0;
3183 static inline int raw_cmd_copyin(int cmd, char __user *param,
3184 struct floppy_raw_cmd **rcmd)
3186 struct floppy_raw_cmd *ptr;
3192 ptr = (struct floppy_raw_cmd *)
3193 kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3197 ret = copy_from_user(ptr, (void __user *)param, sizeof(*ptr));
3201 ptr->buffer_length = 0;
3202 param += sizeof(struct floppy_raw_cmd);
3203 if (ptr->cmd_count > 33)
3204 /* the command may now also take up the space
3205 * initially intended for the reply & the
3206 * reply count. Needed for long 82078 commands
3207 * such as RESTORE, which takes ... 17 command
3208 * bytes. Murphy's law #137: When you reserve
3209 * 16 bytes for a structure, you'll one day
3210 * discover that you really need 17...
3214 for (i = 0; i < 16; i++)
3216 ptr->resultcode = 0;
3217 ptr->kernel_data = NULL;
3219 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3220 if (ptr->length <= 0)
3223 (char *)fd_dma_mem_alloc(ptr->length);
3224 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3225 if (!ptr->kernel_data)
3227 ptr->buffer_length = ptr->length;
3229 if (ptr->flags & FD_RAW_WRITE) {
3230 ret = fd_copyin(ptr->data, ptr->kernel_data,
3235 rcmd = &(ptr->next);
3236 if (!(ptr->flags & FD_RAW_MORE))
3242 static int raw_cmd_ioctl(int cmd, void __user *param)
3244 struct floppy_raw_cmd *my_raw_cmd;
3249 if (FDCS->rawcmd <= 1)
3251 for (drive = 0; drive < N_DRIVE; drive++) {
3252 if (FDC(drive) != fdc)
3254 if (drive == current_drive) {
3255 if (UDRS->fd_ref > 1) {
3259 } else if (UDRS->fd_ref) {
3268 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3270 raw_cmd_free(&my_raw_cmd);
3274 raw_cmd = my_raw_cmd;
3275 cont = &raw_cmd_cont;
3276 ret = wait_til_done(floppy_start, true);
3277 debug_dcl(DP->flags, "calling disk change from raw_cmd ioctl\n");
3279 if (ret != -EINTR && FDCS->reset)
3282 DRS->track = NO_TRACK;
3284 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3287 raw_cmd_free(&my_raw_cmd);
3291 static int invalidate_drive(struct block_device *bdev)
3293 /* invalidate the buffer track to force a reread */
3294 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3295 process_fd_request();
3296 check_disk_change(bdev);
3300 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
3301 int drive, int type, struct block_device *bdev)
3305 /* sanity checking for parameters. */
3308 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3309 /* check if reserved bits are set */
3310 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_SECTBASEMASK)) != 0)
3313 if (!capable(CAP_SYS_ADMIN))
3315 mutex_lock(&open_lock);
3316 if (lock_fdc(drive, true)) {
3317 mutex_unlock(&open_lock);
3320 floppy_type[type] = *g;
3321 floppy_type[type].name = "user format";
3322 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3323 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3324 floppy_type[type].size + 1;
3325 process_fd_request();
3326 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3327 struct block_device *bdev = opened_bdev[cnt];
3328 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3330 __invalidate_device(bdev);
3332 mutex_unlock(&open_lock);
3336 if (lock_fdc(drive, true))
3338 if (cmd != FDDEFPRM) {
3339 /* notice a disk change immediately, else
3340 * we lose our settings immediately*/
3341 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3344 oldStretch = g->stretch;
3345 user_params[drive] = *g;
3346 if (buffer_drive == drive)
3347 SUPBOUND(buffer_max, user_params[drive].sect);
3348 current_type[drive] = &user_params[drive];
3349 floppy_sizes[drive] = user_params[drive].size;
3350 if (cmd == FDDEFPRM)
3351 DRS->keep_data = -1;
3354 /* invalidation. Invalidate only when needed, i.e.
3355 * when there are already sectors in the buffer cache
3356 * whose number will change. This is useful, because
3357 * mtools often changes the geometry of the disk after
3358 * looking at the boot block */
3359 if (DRS->maxblock > user_params[drive].sect ||
3361 ((user_params[drive].sect ^ oldStretch) &
3362 (FD_SWAPSIDES | FD_SECTBASEMASK)))
3363 invalidate_drive(bdev);
3365 process_fd_request();
3370 /* handle obsolete ioctl's */
3371 static int ioctl_table[] = {
3399 static inline int normalize_ioctl(int *cmd, int *size)
3403 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3404 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3405 *size = _IOC_SIZE(*cmd);
3406 *cmd = ioctl_table[i];
3407 if (*size > _IOC_SIZE(*cmd)) {
3408 pr_info("ioctl not yet supported\n");
3417 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3420 *g = &floppy_type[type];
3422 if (lock_fdc(drive, false))
3424 if (poll_drive(false, 0) == -EINTR)
3426 process_fd_request();
3427 *g = current_type[drive];
3434 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3436 int drive = (long)bdev->bd_disk->private_data;
3437 int type = ITYPE(drive_state[drive].fd_device);
3438 struct floppy_struct *g;
3441 ret = get_floppy_geometry(drive, type, &g);
3445 geo->heads = g->head;
3446 geo->sectors = g->sect;
3447 geo->cylinders = g->track;
3451 static int fd_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
3452 unsigned long param)
3454 #define FD_IOCTL_ALLOWED (mode & (FMODE_WRITE|FMODE_WRITE_IOCTL))
3456 int drive = (long)bdev->bd_disk->private_data;
3457 int type = ITYPE(UDRS->fd_device);
3462 struct floppy_struct g; /* geometry */
3463 struct format_descr f;
3464 struct floppy_max_errors max_errors;
3465 struct floppy_drive_params dp;
3466 } inparam; /* parameters coming from user space */
3467 const char *outparam; /* parameters passed back to user space */
3469 /* convert compatibility eject ioctls into floppy eject ioctl.
3470 * We do this in order to provide a means to eject floppy disks before
3471 * installing the new fdutils package */
3472 if (cmd == CDROMEJECT || /* CD-ROM eject */
3473 cmd == 0x6470) { /* SunOS floppy eject */
3474 DPRINT("obsolete eject ioctl\n");
3475 DPRINT("please use floppycontrol --eject\n");
3479 if (!((cmd & 0xff00) == 0x0200))
3482 /* convert the old style command into a new style command */
3483 ret = normalize_ioctl(&cmd, &size);
3487 /* permission checks */
3488 if (((cmd & 0x40) && !FD_IOCTL_ALLOWED) ||
3489 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3492 if (WARN_ON(size < 0 || size > sizeof(inparam)))
3496 memset(&inparam, 0, sizeof(inparam));
3497 if (_IOC_DIR(cmd) & _IOC_WRITE) {
3498 ret = fd_copyin((void __user *)param, &inparam, size);
3505 if (UDRS->fd_ref != 1)
3506 /* somebody else has this drive open */
3508 if (lock_fdc(drive, true))
3511 /* do the actual eject. Fails on
3512 * non-Sparc architectures */
3513 ret = fd_eject(UNIT(drive));
3515 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3516 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3517 process_fd_request();
3520 if (lock_fdc(drive, true))
3522 current_type[drive] = NULL;
3523 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3524 UDRS->keep_data = 0;
3525 return invalidate_drive(bdev);
3528 return set_geometry(cmd, &inparam.g, drive, type, bdev);
3530 ret = get_floppy_geometry(drive, type,
3531 (struct floppy_struct **)
3537 UDP->flags |= FTD_MSG;
3540 UDP->flags &= ~FTD_MSG;
3543 if (lock_fdc(drive, true))
3545 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3548 process_fd_request();
3549 if (ret & FD_VERIFY)
3551 if (!(ret & FD_DISK_WRITABLE))
3555 if (UDRS->fd_ref != 1)
3557 return do_format(drive, &inparam.f);
3560 if (lock_fdc(drive, true))
3562 return invalidate_drive(bdev);
3563 case FDSETEMSGTRESH:
3564 UDP->max_errors.reporting = (unsigned short)(param & 0x0f);
3567 outparam = (const char *)&UDP->max_errors;
3570 UDP->max_errors = inparam.max_errors;
3573 outparam = drive_name(type, drive);
3574 SUPBOUND(size, strlen(outparam) + 1);
3580 outparam = (const char *)UDP;
3583 if (lock_fdc(drive, true))
3585 if (poll_drive(true, FD_RAW_NEED_DISK) == -EINTR)
3587 process_fd_request();
3590 outparam = (const char *)UDRS;
3593 return user_reset_fdc(drive, (int)param, true);
3595 outparam = (const char *)UFDCS;
3598 memset(UDRWE, 0, sizeof(*UDRWE));
3601 outparam = (const char *)UDRWE;
3606 if (lock_fdc(drive, true))
3609 i = raw_cmd_ioctl(cmd, (void __user *)param);
3612 process_fd_request();
3615 if (lock_fdc(drive, true))
3618 process_fd_request();
3624 if (_IOC_DIR(cmd) & _IOC_READ)
3625 return fd_copyout((void __user *)param, outparam, size);
3630 static void __init config_types(void)
3632 bool has_drive = false;
3635 /* read drive info out of physical CMOS */
3638 UDP->cmos = FLOPPY0_TYPE;
3640 if (!UDP->cmos && FLOPPY1_TYPE)
3641 UDP->cmos = FLOPPY1_TYPE;
3643 /* FIXME: additional physical CMOS drive detection should go here */
3645 for (drive = 0; drive < N_DRIVE; drive++) {
3646 unsigned int type = UDP->cmos;
3647 struct floppy_drive_params *params;
3648 const char *name = NULL;
3649 static char temparea[32];
3651 if (type < ARRAY_SIZE(default_drive_params)) {
3652 params = &default_drive_params[type].params;
3654 name = default_drive_params[type].name;
3655 allowed_drive_mask |= 1 << drive;
3657 allowed_drive_mask &= ~(1 << drive);
3659 params = &default_drive_params[0].params;
3660 sprintf(temparea, "unknown type %d (usb?)", type);
3664 const char *prepend;
3668 pr_info("Floppy drive(s):");
3673 pr_cont("%s fd%d is %s", prepend, drive, name);
3682 static int floppy_release(struct gendisk *disk, fmode_t mode)
3684 int drive = (long)disk->private_data;
3686 mutex_lock(&open_lock);
3687 if (UDRS->fd_ref < 0)
3689 else if (!UDRS->fd_ref--) {
3690 DPRINT("floppy_release with fd_ref == 0");
3694 opened_bdev[drive] = NULL;
3695 mutex_unlock(&open_lock);
3701 * floppy_open check for aliasing (/dev/fd0 can be the same as
3702 * /dev/PS0 etc), and disallows simultaneous access to the same
3703 * drive with different device numbers.
3705 static int floppy_open(struct block_device *bdev, fmode_t mode)
3707 int drive = (long)bdev->bd_disk->private_data;
3708 int old_dev, new_dev;
3713 mutex_lock(&open_lock);
3714 old_dev = UDRS->fd_device;
3715 if (opened_bdev[drive] && opened_bdev[drive] != bdev)
3718 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3719 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3720 set_bit(FD_VERIFY_BIT, &UDRS->flags);
3723 if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (mode & FMODE_EXCL)))
3726 if (mode & FMODE_EXCL)
3731 opened_bdev[drive] = bdev;
3735 if (!floppy_track_buffer) {
3736 /* if opening an ED drive, reserve a big buffer,
3737 * else reserve a small one */
3738 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3739 try = 64; /* Only 48 actually useful */
3741 try = 32; /* Only 24 actually useful */
3743 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3744 if (!tmp && !floppy_track_buffer) {
3745 try >>= 1; /* buffer only one side */
3747 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3749 if (!tmp && !floppy_track_buffer)
3750 fallback_on_nodma_alloc(&tmp, 2048 * try);
3751 if (!tmp && !floppy_track_buffer) {
3752 DPRINT("Unable to allocate DMA memory\n");
3755 if (floppy_track_buffer) {
3757 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3759 buffer_min = buffer_max = -1;
3760 floppy_track_buffer = tmp;
3761 max_buffer_sectors = try;
3765 new_dev = MINOR(bdev->bd_dev);
3766 UDRS->fd_device = new_dev;
3767 set_capacity(disks[drive], floppy_sizes[new_dev]);
3768 if (old_dev != -1 && old_dev != new_dev) {
3769 if (buffer_drive == drive)
3773 if (UFDCS->rawcmd == 1)
3776 if (!(mode & FMODE_NDELAY)) {
3777 if (mode & (FMODE_READ|FMODE_WRITE)) {
3778 UDRS->last_checked = 0;
3779 check_disk_change(bdev);
3780 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags))
3784 if ((mode & FMODE_WRITE) &&
3785 !test_bit(FD_DISK_WRITABLE_BIT, &UDRS->flags))
3788 mutex_unlock(&open_lock);
3791 if (UDRS->fd_ref < 0)
3796 opened_bdev[drive] = NULL;
3798 mutex_unlock(&open_lock);
3803 * Check if the disk has been changed or if a change has been faked.
3805 static int check_floppy_change(struct gendisk *disk)
3807 int drive = (long)disk->private_data;
3809 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3810 test_bit(FD_VERIFY_BIT, &UDRS->flags))
3813 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3814 lock_fdc(drive, false);
3815 poll_drive(false, 0);
3816 process_fd_request();
3819 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3820 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3821 test_bit(drive, &fake_change) ||
3822 (!ITYPE(UDRS->fd_device) && !current_type[drive]))
3828 * This implements "read block 0" for floppy_revalidate().
3829 * Needed for format autodetection, checking whether there is
3830 * a disk in the drive, and whether that disk is writable.
3833 static void floppy_rb0_complete(struct bio *bio, int err)
3835 complete((struct completion *)bio->bi_private);
3838 static int __floppy_read_block_0(struct block_device *bdev)
3841 struct bio_vec bio_vec;
3842 struct completion complete;
3846 page = alloc_page(GFP_NOIO);
3848 process_fd_request();
3852 size = bdev->bd_block_size;
3857 bio.bi_io_vec = &bio_vec;
3858 bio_vec.bv_page = page;
3859 bio_vec.bv_len = size;
3860 bio_vec.bv_offset = 0;
3866 init_completion(&complete);
3867 bio.bi_private = &complete;
3868 bio.bi_end_io = floppy_rb0_complete;
3870 submit_bio(READ, &bio);
3871 generic_unplug_device(bdev_get_queue(bdev));
3872 process_fd_request();
3873 wait_for_completion(&complete);
3880 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3881 * the bootblock (block 0). "Autodetection" is also needed to check whether
3882 * there is a disk in the drive at all... Thus we also do it for fixed
3883 * geometry formats */
3884 static int floppy_revalidate(struct gendisk *disk)
3886 int drive = (long)disk->private_data;
3887 #define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
3891 if (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3892 test_bit(FD_VERIFY_BIT, &UDRS->flags) ||
3893 test_bit(drive, &fake_change) || NO_GEOM) {
3894 if (usage_count == 0) {
3895 pr_info("VFS: revalidate called on non-open device.\n");
3898 lock_fdc(drive, false);
3899 cf = (test_bit(FD_DISK_CHANGED_BIT, &UDRS->flags) ||
3900 test_bit(FD_VERIFY_BIT, &UDRS->flags));
3901 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
3902 process_fd_request(); /*already done by another thread */
3907 if (buffer_drive == drive)
3909 clear_bit(drive, &fake_change);
3910 clear_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
3915 res = __floppy_read_block_0(opened_bdev[drive]);
3918 poll_drive(false, FD_RAW_NEED_DISK);
3919 process_fd_request();
3922 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3926 static const struct block_device_operations floppy_fops = {
3927 .owner = THIS_MODULE,
3928 .open = floppy_open,
3929 .release = floppy_release,
3930 .locked_ioctl = fd_ioctl,
3931 .getgeo = fd_getgeo,
3932 .media_changed = check_floppy_change,
3933 .revalidate_disk = floppy_revalidate,
3937 * Floppy Driver initialization
3938 * =============================
3941 /* Determine the floppy disk controller type */
3942 /* This routine was written by David C. Niemi */
3943 static char __init get_fdc_version(void)
3947 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
3952 return FDC_NONE; /* No FDC present ??? */
3953 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3954 pr_info("FDC %d is an 8272A\n", fdc);
3955 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
3958 pr_info("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3963 if (!fdc_configure()) {
3964 pr_info("FDC %d is an 82072\n", fdc);
3965 return FDC_82072; /* 82072 doesn't know CONFIGURE */
3968 output_byte(FD_PERPENDICULAR);
3969 if (need_more_output() == MORE_OUTPUT) {
3972 pr_info("FDC %d is an 82072A\n", fdc);
3973 return FDC_82072A; /* 82072A as found on Sparcs. */
3976 output_byte(FD_UNLOCK);
3978 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3979 pr_info("FDC %d is a pre-1991 82077\n", fdc);
3980 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
3983 if ((r != 1) || (reply_buffer[0] != 0x00)) {
3984 pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3988 output_byte(FD_PARTID);
3991 pr_info("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3995 if (reply_buffer[0] == 0x80) {
3996 pr_info("FDC %d is a post-1991 82077\n", fdc);
3997 return FDC_82077; /* Revised 82077AA passes all the tests */
3999 switch (reply_buffer[0] >> 5) {
4001 /* Either a 82078-1 or a 82078SL running at 5Volt */
4002 pr_info("FDC %d is an 82078.\n", fdc);
4005 pr_info("FDC %d is a 44pin 82078\n", fdc);
4008 pr_info("FDC %d is a S82078B\n", fdc);
4011 pr_info("FDC %d is a National Semiconductor PC87306\n", fdc);
4014 pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4015 fdc, reply_buffer[0] >> 5);
4016 return FDC_82078_UNKN;
4018 } /* get_fdc_version */
4020 /* lilo configuration */
4022 static void __init floppy_set_flags(int *ints, int param, int param2)
4026 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4028 default_drive_params[i].params.flags |= param2;
4030 default_drive_params[i].params.flags &= ~param2;
4032 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4035 static void __init daring(int *ints, int param, int param2)
4039 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4041 default_drive_params[i].params.select_delay = 0;
4042 default_drive_params[i].params.flags |=
4043 FD_SILENT_DCL_CLEAR;
4045 default_drive_params[i].params.select_delay =
4047 default_drive_params[i].params.flags &=
4048 ~FD_SILENT_DCL_CLEAR;
4051 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4054 static void __init set_cmos(int *ints, int dummy, int dummy2)
4056 int current_drive = 0;
4059 DPRINT("wrong number of parameters for CMOS\n");
4062 current_drive = ints[1];
4063 if (current_drive < 0 || current_drive >= 8) {
4064 DPRINT("bad drive for set_cmos\n");
4068 if (current_drive >= 4 && !FDC2)
4072 DPRINT("setting CMOS code to %d\n", ints[2]);
4075 static struct param_table {
4077 void (*fn) (int *ints, int param, int param2);
4081 } config_params[] __initdata = {
4082 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4083 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4084 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4085 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4086 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4087 {"daring", daring, NULL, 1, 0},
4089 {"two_fdc", NULL, &FDC2, 0x370, 0},
4090 {"one_fdc", NULL, &FDC2, 0, 0},
4092 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4093 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4094 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4095 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4096 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4097 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4098 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4099 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4100 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4101 {"nofifo", NULL, &no_fifo, 0x20, 0},
4102 {"usefifo", NULL, &no_fifo, 0, 0},
4103 {"cmos", set_cmos, NULL, 0, 0},
4104 {"slow", NULL, &slow_floppy, 1, 0},
4105 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4106 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4107 {"L40SX", NULL, &print_unex, 0, 0}
4112 static int __init floppy_setup(char *str)
4118 str = get_options(str, ARRAY_SIZE(ints), ints);
4120 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4121 if (strcmp(str, config_params[i].name) == 0) {
4125 param = config_params[i].def_param;
4126 if (config_params[i].fn)
4127 config_params[i].fn(ints, param,
4130 if (config_params[i].var) {
4131 DPRINT("%s=%d\n", str, param);
4132 *config_params[i].var = param;
4139 DPRINT("unknown floppy option [%s]\n", str);
4141 DPRINT("allowed options are:");
4142 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4143 pr_cont(" %s", config_params[i].name);
4146 DPRINT("botched floppy option\n");
4147 DPRINT("Read Documentation/blockdev/floppy.txt\n");
4151 static int have_no_fdc = -ENODEV;
4153 static ssize_t floppy_cmos_show(struct device *dev,
4154 struct device_attribute *attr, char *buf)
4156 struct platform_device *p = to_platform_device(dev);
4160 return sprintf(buf, "%X\n", UDP->cmos);
4163 DEVICE_ATTR(cmos, S_IRUGO, floppy_cmos_show, NULL);
4165 static void floppy_device_release(struct device *dev)
4169 static int floppy_resume(struct device *dev)
4173 for (fdc = 0; fdc < N_FDC; fdc++)
4174 if (FDCS->address != -1)
4175 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4180 static const struct dev_pm_ops floppy_pm_ops = {
4181 .resume = floppy_resume,
4182 .restore = floppy_resume,
4185 static struct platform_driver floppy_driver = {
4188 .pm = &floppy_pm_ops,
4192 static struct platform_device floppy_device[N_DRIVE];
4194 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4196 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4197 if (drive >= N_DRIVE ||
4198 !(allowed_drive_mask & (1 << drive)) ||
4199 fdc_state[FDC(drive)].version == FDC_NONE)
4201 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4204 return get_disk(disks[drive]);
4207 static int __init floppy_init(void)
4212 #if defined(CONFIG_PPC)
4213 if (check_legacy_ioport(FDC1))
4219 for (dr = 0; dr < N_DRIVE; dr++) {
4220 disks[dr] = alloc_disk(1);
4226 disks[dr]->major = FLOPPY_MAJOR;
4227 disks[dr]->first_minor = TOMINOR(dr);
4228 disks[dr]->fops = &floppy_fops;
4229 sprintf(disks[dr]->disk_name, "fd%d", dr);
4231 init_timer(&motor_off_timer[dr]);
4232 motor_off_timer[dr].data = dr;
4233 motor_off_timer[dr].function = motor_off_callback;
4236 err = register_blkdev(FLOPPY_MAJOR, "fd");
4240 err = platform_driver_register(&floppy_driver);
4242 goto out_unreg_blkdev;
4244 floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
4245 if (!floppy_queue) {
4247 goto out_unreg_driver;
4249 blk_queue_max_hw_sectors(floppy_queue, 64);
4251 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4252 floppy_find, NULL, NULL);
4254 for (i = 0; i < 256; i++)
4256 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4258 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4260 reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
4263 for (i = 0; i < N_FDC; i++) {
4265 memset(FDCS, 0, sizeof(*FDCS));
4268 #if defined(__sparc__) || defined(__mc68000__)
4269 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4273 FDCS->version = FDC_82072A;
4277 use_virtual_dma = can_use_virtual_dma & 1;
4278 fdc_state[0].address = FDC1;
4279 if (fdc_state[0].address == -1) {
4280 del_timer(&fd_timeout);
4282 goto out_unreg_region;
4285 fdc_state[1].address = FDC2;
4288 fdc = 0; /* reset fdc in case of unexpected interrupt */
4289 err = floppy_grab_irq_and_dma();
4291 del_timer(&fd_timeout);
4293 goto out_unreg_region;
4296 /* initialise drive state */
4297 for (drive = 0; drive < N_DRIVE; drive++) {
4298 memset(UDRS, 0, sizeof(*UDRS));
4299 memset(UDRWE, 0, sizeof(*UDRWE));
4300 set_bit(FD_DISK_NEWCHANGE_BIT, &UDRS->flags);
4301 set_bit(FD_DISK_CHANGED_BIT, &UDRS->flags);
4302 set_bit(FD_VERIFY_BIT, &UDRS->flags);
4303 UDRS->fd_device = -1;
4304 floppy_track_buffer = NULL;
4305 max_buffer_sectors = 0;
4308 * Small 10 msec delay to let through any interrupt that
4309 * initialization might have triggered, to not
4310 * confuse detection:
4314 for (i = 0; i < N_FDC; i++) {
4316 FDCS->driver_version = FD_DRIVER_VERSION;
4317 for (unit = 0; unit < 4; unit++)
4318 FDCS->track[unit] = 0;
4319 if (FDCS->address == -1)
4322 if (user_reset_fdc(-1, FD_RESET_ALWAYS, false)) {
4323 /* free ioports reserved by floppy_grab_irq_and_dma() */
4324 floppy_release_regions(fdc);
4326 FDCS->version = FDC_NONE;
4329 /* Try to determine the floppy controller type */
4330 FDCS->version = get_fdc_version();
4331 if (FDCS->version == FDC_NONE) {
4332 /* free ioports reserved by floppy_grab_irq_and_dma() */
4333 floppy_release_regions(fdc);
4337 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4338 can_use_virtual_dma = 0;
4341 /* Not all FDCs seem to be able to handle the version command
4342 * properly, so force a reset for the standard FDC clones,
4343 * to avoid interrupt garbage.
4345 user_reset_fdc(-1, FD_RESET_ALWAYS, false);
4348 del_timer(&fd_timeout);
4352 DPRINT("no floppy controllers found\n");
4354 goto out_flush_work;
4357 for (drive = 0; drive < N_DRIVE; drive++) {
4358 if (!(allowed_drive_mask & (1 << drive)))
4360 if (fdc_state[FDC(drive)].version == FDC_NONE)
4363 floppy_device[drive].name = floppy_device_name;
4364 floppy_device[drive].id = drive;
4365 floppy_device[drive].dev.release = floppy_device_release;
4367 err = platform_device_register(&floppy_device[drive]);
4369 goto out_flush_work;
4371 err = device_create_file(&floppy_device[drive].dev,
4374 goto out_unreg_platform_dev;
4376 /* to be cleaned up... */
4377 disks[drive]->private_data = (void *)(long)drive;
4378 disks[drive]->queue = floppy_queue;
4379 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4380 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4381 add_disk(disks[drive]);
4386 out_unreg_platform_dev:
4387 platform_device_unregister(&floppy_device[drive]);
4389 flush_scheduled_work();
4391 floppy_release_irq_and_dma();
4393 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4394 blk_cleanup_queue(floppy_queue);
4396 platform_driver_unregister(&floppy_driver);
4398 unregister_blkdev(FLOPPY_MAJOR, "fd");
4401 del_timer(&motor_off_timer[dr]);
4402 put_disk(disks[dr]);
4407 static DEFINE_SPINLOCK(floppy_usage_lock);
4409 static const struct io_region {
4414 /* address + 3 is sometimes reserved by pnp bios for motherboard */
4416 /* address + 6 is reserved, and may be taken by IDE.
4417 * Unfortunately, Adaptec doesn't know this :-(, */
4421 static void floppy_release_allocated_regions(int fdc, const struct io_region *p)
4423 while (p != io_regions) {
4425 release_region(FDCS->address + p->offset, p->size);
4429 #define ARRAY_END(X) (&((X)[ARRAY_SIZE(X)]))
4431 static int floppy_request_regions(int fdc)
4433 const struct io_region *p;
4435 for (p = io_regions; p < ARRAY_END(io_regions); p++) {
4436 if (!request_region(FDCS->address + p->offset,
4437 p->size, "floppy")) {
4438 DPRINT("Floppy io-port 0x%04lx in use\n",
4439 FDCS->address + p->offset);
4440 floppy_release_allocated_regions(fdc, p);
4447 static void floppy_release_regions(int fdc)
4449 floppy_release_allocated_regions(fdc, ARRAY_END(io_regions));
4452 static int floppy_grab_irq_and_dma(void)
4454 unsigned long flags;
4456 spin_lock_irqsave(&floppy_usage_lock, flags);
4457 if (usage_count++) {
4458 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4461 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4464 * We might have scheduled a free_irq(), wait it to
4467 flush_scheduled_work();
4469 if (fd_request_irq()) {
4470 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4472 spin_lock_irqsave(&floppy_usage_lock, flags);
4474 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4477 if (fd_request_dma()) {
4478 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4480 if (can_use_virtual_dma & 2)
4481 use_virtual_dma = can_use_virtual_dma = 1;
4482 if (!(can_use_virtual_dma & 1)) {
4484 spin_lock_irqsave(&floppy_usage_lock, flags);
4486 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4491 for (fdc = 0; fdc < N_FDC; fdc++) {
4492 if (FDCS->address != -1) {
4493 if (floppy_request_regions(fdc))
4497 for (fdc = 0; fdc < N_FDC; fdc++) {
4498 if (FDCS->address != -1) {
4500 fd_outb(FDCS->dor, FD_DOR);
4504 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4506 for (fdc = 0; fdc < N_FDC; fdc++)
4507 if (FDCS->address != -1)
4508 fd_outb(FDCS->dor, FD_DOR);
4510 * The driver will try and free resources and relies on us
4511 * to know if they were allocated or not.
4514 irqdma_allocated = 1;
4520 floppy_release_regions(fdc);
4521 spin_lock_irqsave(&floppy_usage_lock, flags);
4523 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4527 static void floppy_release_irq_and_dma(void)
4530 #ifdef FLOPPY_SANITY_CHECK
4536 unsigned long tmpaddr;
4537 unsigned long flags;
4539 spin_lock_irqsave(&floppy_usage_lock, flags);
4540 if (--usage_count) {
4541 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4544 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4545 if (irqdma_allocated) {
4549 irqdma_allocated = 0;
4555 floppy_enable_hlt();
4557 if (floppy_track_buffer && max_buffer_sectors) {
4558 tmpsize = max_buffer_sectors * 1024;
4559 tmpaddr = (unsigned long)floppy_track_buffer;
4560 floppy_track_buffer = NULL;
4561 max_buffer_sectors = 0;
4562 buffer_min = buffer_max = -1;
4563 fd_dma_mem_free(tmpaddr, tmpsize);
4565 #ifdef FLOPPY_SANITY_CHECK
4567 for (drive = 0; drive < N_FDC * 4; drive++)
4568 if (timer_pending(motor_off_timer + drive))
4569 pr_info("motor off timer %d still active\n", drive);
4572 if (timer_pending(&fd_timeout))
4573 pr_info("floppy timer still active:%s\n", timeout_message);
4574 if (timer_pending(&fd_timer))
4575 pr_info("auxiliary floppy timer still active\n");
4576 if (work_pending(&floppy_work))
4577 pr_info("work still pending\n");
4580 for (fdc = 0; fdc < N_FDC; fdc++)
4581 if (FDCS->address != -1)
4582 floppy_release_regions(fdc);
4588 static char *floppy;
4590 static void __init parse_floppy_cfg_string(char *cfg)
4596 while (*cfg && *cfg != ' ' && *cfg != '\t')
4607 static int __init floppy_module_init(void)
4610 parse_floppy_cfg_string(floppy);
4611 return floppy_init();
4613 module_init(floppy_module_init);
4615 static void __exit floppy_module_exit(void)
4619 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4620 unregister_blkdev(FLOPPY_MAJOR, "fd");
4621 platform_driver_unregister(&floppy_driver);
4623 for (drive = 0; drive < N_DRIVE; drive++) {
4624 del_timer_sync(&motor_off_timer[drive]);
4626 if ((allowed_drive_mask & (1 << drive)) &&
4627 fdc_state[FDC(drive)].version != FDC_NONE) {
4628 del_gendisk(disks[drive]);
4629 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4630 platform_device_unregister(&floppy_device[drive]);
4632 put_disk(disks[drive]);
4635 del_timer_sync(&fd_timeout);
4636 del_timer_sync(&fd_timer);
4637 blk_cleanup_queue(floppy_queue);
4640 floppy_release_irq_and_dma();
4642 /* eject disk, if any */
4646 module_exit(floppy_module_exit);
4648 module_param(floppy, charp, 0);
4649 module_param(FLOPPY_IRQ, int, 0);
4650 module_param(FLOPPY_DMA, int, 0);
4651 MODULE_AUTHOR("Alain L. Knaff");
4652 MODULE_SUPPORTED_DEVICE("fd");
4653 MODULE_LICENSE("GPL");
4655 /* This doesn't actually get used other than for module information */
4656 static const struct pnp_device_id floppy_pnpids[] = {
4661 MODULE_DEVICE_TABLE(pnp, floppy_pnpids);
4665 __setup("floppy=", floppy_setup);
4666 module_init(floppy_init)
4669 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);