2 * linux/drivers/block/floppy.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 1993, 1994 Alain Knaff
6 * Copyright (C) 1998 Alan Cox
10 * 02.12.91 - Changed to static variables to indicate need for reset
11 * and recalibrate. This makes some things easier (output_byte reset
12 * checking etc), and means less interrupt jumping in case of errors,
13 * so the code is hopefully easier to understand.
17 * This file is certainly a mess. I've tried my best to get it working,
18 * but I don't like programming floppies, and I have only one anyway.
19 * Urgel. I should check for more errors, and do more graceful error
20 * recovery. Seems there are problems with several drives. I've tried to
21 * correct them. No promises.
25 * As with hd.c, all routines within this file can (and will) be called
26 * by interrupts, so extreme caution is needed. A hardware interrupt
27 * handler may not sleep, or a kernel panic will happen. Thus I cannot
28 * call "floppy-on" directly, but have to set a special timer interrupt
33 * 28.02.92 - made track-buffering routines, based on the routines written
34 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
38 * Automatic floppy-detection and formatting written by Werner Almesberger
39 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
40 * the floppy-change signal detection.
44 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
45 * FDC data overrun bug, added some preliminary stuff for vertical
48 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
50 * TODO: Errors are still not counted properly.
54 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
55 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
56 * Christoph H. Hochst\"atter.
57 * I have fixed the shift values to the ones I always use. Maybe a new
58 * ioctl() should be created to be able to modify them.
59 * There is a bug in the driver that makes it impossible to format a
60 * floppy as the first thing after bootup.
64 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
65 * this helped the floppy driver as well. Much cleaner, and still seems to
69 /* 1994/6/24 --bbroad-- added the floppy table entries and made
70 * minor modifications to allow 2.88 floppies to be run.
73 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
78 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
79 * format bug fixes, but unfortunately some new bugs too...
82 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
83 * errors to allow safe writing by specialized programs.
86 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
87 * by defining bit 1 of the "stretch" parameter to mean put sectors on the
88 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
89 * drives are "upside-down").
93 * 1995/8/26 -- Andreas Busse -- added Mips support.
97 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
98 * features to asm/floppy.h.
102 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
106 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
107 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
108 * use of '0' for NULL.
112 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
117 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
121 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
122 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
123 * being used to store jiffies, which are unsigned longs).
127 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
128 * - get rid of check_region
133 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
134 * floppy controller (lingering task on list after module is gone... boom.)
138 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
139 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
140 * requires many non-obvious changes in arch dependent code.
143 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
144 * Better audit of register_blkdev.
147 #define FLOPPY_SANITY_CHECK
148 #undef FLOPPY_SILENT_DCL_CLEAR
150 #define REALLY_SLOW_IO
153 #define DCL_DEBUG /* debug disk change line */
155 /* do print messages for unexpected interrupts */
156 static int print_unex = 1;
157 #include <linux/module.h>
158 #include <linux/sched.h>
159 #include <linux/fs.h>
160 #include <linux/kernel.h>
161 #include <linux/timer.h>
162 #include <linux/workqueue.h>
164 #include <linux/fdreg.h>
165 #include <linux/fd.h>
166 #include <linux/hdreg.h>
167 #include <linux/errno.h>
168 #include <linux/slab.h>
169 #include <linux/mm.h>
170 #include <linux/bio.h>
171 #include <linux/string.h>
172 #include <linux/jiffies.h>
173 #include <linux/fcntl.h>
174 #include <linux/delay.h>
175 #include <linux/mc146818rtc.h> /* CMOS defines */
176 #include <linux/ioport.h>
177 #include <linux/interrupt.h>
178 #include <linux/init.h>
179 #include <linux/platform_device.h>
180 #include <linux/buffer_head.h> /* for invalidate_buffers() */
181 #include <linux/mutex.h>
184 * PS/2 floppies have much slower step rates than regular floppies.
185 * It's been recommended that take about 1/4 of the default speed
186 * in some more extreme cases.
188 static int slow_floppy;
192 #include <asm/system.h>
194 #include <asm/uaccess.h>
196 static int FLOPPY_IRQ = 6;
197 static int FLOPPY_DMA = 2;
198 static int can_use_virtual_dma = 2;
200 * can use virtual DMA:
201 * 0 = use of virtual DMA disallowed by config
202 * 1 = use of virtual DMA prescribed by config
203 * 2 = no virtual DMA preference configured. By default try hard DMA,
204 * but fall back on virtual DMA when not enough memory available
207 static int use_virtual_dma;
211 * 1 using virtual DMA
212 * This variable is set to virtual when a DMA mem problem arises, and
213 * reset back in floppy_grab_irq_and_dma.
214 * It is not safe to reset it in other circumstances, because the floppy
215 * driver may have several buffers in use at once, and we do currently not
216 * record each buffers capabilities
219 static DEFINE_SPINLOCK(floppy_lock);
220 static struct completion device_release;
222 static unsigned short virtual_dma_port = 0x3f0;
223 irqreturn_t floppy_interrupt(int irq, void *dev_id);
224 static int set_dor(int fdc, char mask, char data);
226 #define K_64 0x10000 /* 64KB */
228 /* the following is the mask of allowed drives. By default units 2 and
229 * 3 of both floppy controllers are disabled, because switching on the
230 * motor of these drives causes system hangs on some PCI computers. drive
231 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
232 * a drive is allowed.
234 * NOTE: This must come before we include the arch floppy header because
235 * some ports reference this variable from there. -DaveM
238 static int allowed_drive_mask = 0x33;
240 #include <asm/floppy.h>
242 static int irqdma_allocated;
244 #define DEVICE_NAME "floppy"
246 #include <linux/blkdev.h>
247 #include <linux/blkpg.h>
248 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
249 #include <linux/completion.h>
251 static struct request *current_req;
252 static struct request_queue *floppy_queue;
253 static void do_fd_request(struct request_queue * q);
255 #ifndef fd_get_dma_residue
256 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
259 /* Dma Memory related stuff */
261 #ifndef fd_dma_mem_free
262 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
265 #ifndef fd_dma_mem_alloc
266 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL,get_order(size))
269 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
271 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
273 return; /* we have the memory */
274 if (can_use_virtual_dma != 2)
275 return; /* no fallback allowed */
276 printk("DMA memory shortage. Temporarily falling back on virtual DMA\n");
277 *addr = (char *)nodma_mem_alloc(l);
283 /* End dma memory related stuff */
285 static unsigned long fake_change;
286 static int initialising = 1;
288 #define ITYPE(x) (((x)>>2) & 0x1f)
289 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
290 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
291 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
292 /* reverse mapping from unit and fdc to drive */
293 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
294 #define DP (&drive_params[current_drive])
295 #define DRS (&drive_state[current_drive])
296 #define DRWE (&write_errors[current_drive])
297 #define FDCS (&fdc_state[fdc])
298 #define CLEARF(x) clear_bit(x##_BIT, &DRS->flags)
299 #define SETF(x) set_bit(x##_BIT, &DRS->flags)
300 #define TESTF(x) test_bit(x##_BIT, &DRS->flags)
302 #define UDP (&drive_params[drive])
303 #define UDRS (&drive_state[drive])
304 #define UDRWE (&write_errors[drive])
305 #define UFDCS (&fdc_state[FDC(drive)])
306 #define UCLEARF(x) clear_bit(x##_BIT, &UDRS->flags)
307 #define USETF(x) set_bit(x##_BIT, &UDRS->flags)
308 #define UTESTF(x) test_bit(x##_BIT, &UDRS->flags)
310 #define DPRINT(format, args...) printk(DEVICE_NAME "%d: " format, current_drive , ## args)
312 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
313 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
315 #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
318 #define COMMAND raw_cmd->cmd[0]
319 #define DR_SELECT raw_cmd->cmd[1]
320 #define TRACK raw_cmd->cmd[2]
321 #define HEAD raw_cmd->cmd[3]
322 #define SECTOR raw_cmd->cmd[4]
323 #define SIZECODE raw_cmd->cmd[5]
324 #define SECT_PER_TRACK raw_cmd->cmd[6]
325 #define GAP raw_cmd->cmd[7]
326 #define SIZECODE2 raw_cmd->cmd[8]
330 #define F_SIZECODE raw_cmd->cmd[2]
331 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
332 #define F_GAP raw_cmd->cmd[4]
333 #define F_FILL raw_cmd->cmd[5]
337 * Maximum disk size (in kilobytes). This default is used whenever the
338 * current disk size is unknown.
339 * [Now it is rather a minimum]
341 #define MAX_DISK_SIZE 4 /* 3984 */
344 * globals used by 'result()'
346 #define MAX_REPLIES 16
347 static unsigned char reply_buffer[MAX_REPLIES];
348 static int inr; /* size of reply buffer, when called from interrupt */
349 #define ST0 (reply_buffer[0])
350 #define ST1 (reply_buffer[1])
351 #define ST2 (reply_buffer[2])
352 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
353 #define R_TRACK (reply_buffer[3])
354 #define R_HEAD (reply_buffer[4])
355 #define R_SECTOR (reply_buffer[5])
356 #define R_SIZECODE (reply_buffer[6])
357 #define SEL_DLY (2*HZ/100)
360 * this struct defines the different floppy drive types.
363 struct floppy_drive_params params;
364 const char *name; /* name printed while booting */
365 } default_drive_params[] = {
366 /* NOTE: the time values in jiffies should be in msec!
368 | Maximum data rate supported by drive type
369 | | Head load time, msec
370 | | | Head unload time, msec (not used)
371 | | | | Step rate interval, usec
372 | | | | | Time needed for spinup time (jiffies)
373 | | | | | | Timeout for spinning down (jiffies)
374 | | | | | | | Spindown offset (where disk stops)
375 | | | | | | | | Select delay
376 | | | | | | | | | RPS
377 | | | | | | | | | | Max number of tracks
378 | | | | | | | | | | | Interrupt timeout
379 | | | | | | | | | | | | Max nonintlv. sectors
380 | | | | | | | | | | | | | -Max Errors- flags */
381 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
382 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
384 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
385 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
387 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
388 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
390 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
391 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
393 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
394 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
396 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
397 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
399 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
400 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
401 /* | --autodetected formats--- | | |
402 * read_track | | Name printed when booting
404 * Frequency of disk change checks */
407 static struct floppy_drive_params drive_params[N_DRIVE];
408 static struct floppy_drive_struct drive_state[N_DRIVE];
409 static struct floppy_write_errors write_errors[N_DRIVE];
410 static struct timer_list motor_off_timer[N_DRIVE];
411 static struct gendisk *disks[N_DRIVE];
412 static struct block_device *opened_bdev[N_DRIVE];
413 static DEFINE_MUTEX(open_lock);
414 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
417 * This struct defines the different floppy types.
419 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
420 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
421 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
422 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
423 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
424 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
425 * side 0 is on physical side 0 (but with the misnamed sector IDs).
426 * 'stretch' should probably be renamed to something more general, like
427 * 'options'. Other parameters should be self-explanatory (see also
437 | | | | | | Data rate, | 0x40 for perp
438 | | | | | | | Spec1 (stepping rate, head unload
439 | | | | | | | | /fmt gap (gap2) */
440 static struct floppy_struct floppy_type[32] = {
441 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
442 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
443 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
444 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
445 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
446 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
447 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
448 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
449 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
450 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
452 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
453 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
454 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
455 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
456 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
457 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
458 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
459 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
460 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
461 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
463 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
464 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
465 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
466 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
467 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
468 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
469 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
470 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
471 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
472 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
474 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
475 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
478 #define SECTSIZE (_FD_SECTSIZE(*floppy))
480 /* Auto-detection: Disk type used until the next media change occurs. */
481 static struct floppy_struct *current_type[N_DRIVE];
484 * User-provided type information. current_type points to
485 * the respective entry of this array.
487 static struct floppy_struct user_params[N_DRIVE];
489 static sector_t floppy_sizes[256];
491 static char floppy_device_name[] = "floppy";
494 * The driver is trying to determine the correct media format
495 * while probing is set. rw_interrupt() clears it after a
500 /* Synchronization of FDC access. */
501 #define FD_COMMAND_NONE -1
502 #define FD_COMMAND_ERROR 2
503 #define FD_COMMAND_OKAY 3
505 static volatile int command_status = FD_COMMAND_NONE;
506 static unsigned long fdc_busy;
507 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
508 static DECLARE_WAIT_QUEUE_HEAD(command_done);
510 #define NO_SIGNAL (!interruptible || !signal_pending(current))
511 #define CALL(x) if ((x) == -EINTR) return -EINTR
512 #define ECALL(x) if ((ret = (x))) return ret;
513 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
514 #define WAIT(x) _WAIT((x),interruptible)
515 #define IWAIT(x) _WAIT((x),1)
517 /* Errors during formatting are counted here. */
518 static int format_errors;
520 /* Format request descriptor. */
521 static struct format_descr format_req;
524 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
525 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
526 * H is head unload time (1=16ms, 2=32ms, etc)
531 * Because these are written to by the DMA controller, they must
532 * not contain a 64k byte boundary crossing, or data will be
535 static char *floppy_track_buffer;
536 static int max_buffer_sectors;
539 typedef void (*done_f)(int);
540 static struct cont_t {
541 void (*interrupt)(void); /* this is called after the interrupt of the
543 void (*redo)(void); /* this is called to retry the operation */
544 void (*error)(void); /* this is called to tally an error */
545 done_f done; /* this is called to say if the operation has
546 * succeeded/failed */
549 static void floppy_ready(void);
550 static void floppy_start(void);
551 static void process_fd_request(void);
552 static void recalibrate_floppy(void);
553 static void floppy_shutdown(unsigned long);
555 static int floppy_grab_irq_and_dma(void);
556 static void floppy_release_irq_and_dma(void);
559 * The "reset" variable should be tested whenever an interrupt is scheduled,
560 * after the commands have been sent. This is to ensure that the driver doesn't
561 * get wedged when the interrupt doesn't come because of a failed command.
562 * reset doesn't need to be tested before sending commands, because
563 * output_byte is automatically disabled when reset is set.
565 #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
566 static void reset_fdc(void);
569 * These are global variables, as that's the easiest way to give
570 * information to interrupts. They are the data used for the current
574 #define NEED_1_RECAL -2
575 #define NEED_2_RECAL -3
577 static int usage_count;
579 /* buffer related variables */
580 static int buffer_track = -1;
581 static int buffer_drive = -1;
582 static int buffer_min = -1;
583 static int buffer_max = -1;
585 /* fdc related variables, should end up in a struct */
586 static struct floppy_fdc_state fdc_state[N_FDC];
587 static int fdc; /* current fdc */
589 static struct floppy_struct *_floppy = floppy_type;
590 static unsigned char current_drive;
591 static long current_count_sectors;
592 static unsigned char fsector_t; /* sector in track */
593 static unsigned char in_sector_offset; /* offset within physical sector,
594 * expressed in units of 512 bytes */
597 static inline int fd_eject(int drive)
608 static long unsigned debugtimer;
610 static inline void set_debugt(void)
612 debugtimer = jiffies;
615 static inline void debugt(const char *message)
617 if (DP->flags & DEBUGT)
618 printk("%s dtime=%lu\n", message, jiffies - debugtimer);
621 static inline void set_debugt(void) { }
622 static inline void debugt(const char *message) { }
625 typedef void (*timeout_fn) (unsigned long);
626 static DEFINE_TIMER(fd_timeout, floppy_shutdown, 0, 0);
628 static const char *timeout_message;
630 #ifdef FLOPPY_SANITY_CHECK
631 static void is_alive(const char *message)
633 /* this routine checks whether the floppy driver is "alive" */
634 if (test_bit(0, &fdc_busy) && command_status < 2
635 && !timer_pending(&fd_timeout)) {
636 DPRINT("timeout handler died: %s\n", message);
641 static void (*do_floppy) (void) = NULL;
643 #ifdef FLOPPY_SANITY_CHECK
647 static void (*lasthandler) (void);
648 static unsigned long interruptjiffies;
649 static unsigned long resultjiffies;
650 static int resultsize;
651 static unsigned long lastredo;
653 static struct output_log {
655 unsigned char status;
656 unsigned long jiffies;
657 } output_log[OLOGSIZE];
659 static int output_log_pos;
662 #define current_reqD -1
663 #define MAXTIMEOUT -2
665 static void __reschedule_timeout(int drive, const char *message, int marg)
667 if (drive == current_reqD)
668 drive = current_drive;
669 del_timer(&fd_timeout);
670 if (drive < 0 || drive >= N_DRIVE) {
671 fd_timeout.expires = jiffies + 20UL * HZ;
674 fd_timeout.expires = jiffies + UDP->timeout;
675 add_timer(&fd_timeout);
676 if (UDP->flags & FD_DEBUG) {
677 DPRINT("reschedule timeout ");
678 printk(message, marg);
681 timeout_message = message;
684 static void reschedule_timeout(int drive, const char *message, int marg)
688 spin_lock_irqsave(&floppy_lock, flags);
689 __reschedule_timeout(drive, message, marg);
690 spin_unlock_irqrestore(&floppy_lock, flags);
693 #define INFBOUND(a,b) (a)=max_t(int, a, b)
694 #define SUPBOUND(a,b) (a)=min_t(int, a, b)
697 * Bottom half floppy driver.
698 * ==========================
700 * This part of the file contains the code talking directly to the hardware,
701 * and also the main service loop (seek-configure-spinup-command)
706 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
707 * and the last_checked date.
709 * last_checked is the date of the last check which showed 'no disk change'
710 * FD_DISK_CHANGE is set under two conditions:
711 * 1. The floppy has been changed after some i/o to that floppy already
713 * 2. No floppy disk is in the drive. This is done in order to ensure that
714 * requests are quickly flushed in case there is no disk in the drive. It
715 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
718 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
719 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
720 * each seek. If a disk is present, the disk change line should also be
721 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
722 * change line is set, this means either that no disk is in the drive, or
723 * that it has been removed since the last seek.
725 * This means that we really have a third possibility too:
726 * The floppy has been changed after the last seek.
729 static int disk_change(int drive)
731 int fdc = FDC(drive);
733 #ifdef FLOPPY_SANITY_CHECK
734 if (time_before(jiffies, UDRS->select_date + UDP->select_delay))
735 DPRINT("WARNING disk change called early\n");
736 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
737 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
738 DPRINT("probing disk change on unselected drive\n");
739 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
740 (unsigned int)FDCS->dor);
745 if (UDP->flags & FD_DEBUG) {
746 DPRINT("checking disk change line for drive %d\n", drive);
747 DPRINT("jiffies=%lu\n", jiffies);
748 DPRINT("disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
749 DPRINT("flags=%lx\n", UDRS->flags);
752 if (UDP->flags & FD_BROKEN_DCL)
753 return UTESTF(FD_DISK_CHANGED);
754 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
755 USETF(FD_VERIFY); /* verify write protection */
756 if (UDRS->maxblock) {
757 /* mark it changed */
758 USETF(FD_DISK_CHANGED);
761 /* invalidate its geometry */
762 if (UDRS->keep_data >= 0) {
763 if ((UDP->flags & FTD_MSG) &&
764 current_type[drive] != NULL)
765 DPRINT("Disk type is undefined after "
767 current_type[drive] = NULL;
768 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
771 /*USETF(FD_DISK_NEWCHANGE); */
774 UDRS->last_checked = jiffies;
775 UCLEARF(FD_DISK_NEWCHANGE);
780 static inline int is_selected(int dor, int unit)
782 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
785 static int set_dor(int fdc, char mask, char data)
787 register unsigned char drive, unit, newdor, olddor;
789 if (FDCS->address == -1)
793 newdor = (olddor & mask) | data;
794 if (newdor != olddor) {
796 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
797 drive = REVDRIVE(fdc, unit);
799 if (UDP->flags & FD_DEBUG) {
800 DPRINT("calling disk change from set_dor\n");
806 fd_outb(newdor, FD_DOR);
809 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
810 drive = REVDRIVE(fdc, unit);
811 UDRS->select_date = jiffies;
817 static void twaddle(void)
819 if (DP->select_delay)
821 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
822 fd_outb(FDCS->dor, FD_DOR);
823 DRS->select_date = jiffies;
826 /* reset all driver information about the current fdc. This is needed after
827 * a reset, and after a raw command. */
828 static void reset_fdc_info(int mode)
832 FDCS->spec1 = FDCS->spec2 = -1;
833 FDCS->need_configure = 1;
836 for (drive = 0; drive < N_DRIVE; drive++)
837 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
838 UDRS->track = NEED_2_RECAL;
841 /* selects the fdc and drive, and enables the fdc's input/dma. */
842 static void set_fdc(int drive)
844 if (drive >= 0 && drive < N_DRIVE) {
846 current_drive = drive;
848 if (fdc != 1 && fdc != 0) {
849 printk("bad fdc value\n");
854 set_dor(1 - fdc, ~8, 0);
856 if (FDCS->rawcmd == 2)
858 if (fd_inb(FD_STATUS) != STATUS_READY)
862 /* locks the driver */
863 static int _lock_fdc(int drive, int interruptible, int line)
867 "Trying to lock fdc while usage count=0 at line %d\n",
872 if (test_and_set_bit(0, &fdc_busy)) {
873 DECLARE_WAITQUEUE(wait, current);
874 add_wait_queue(&fdc_wait, &wait);
877 set_current_state(TASK_INTERRUPTIBLE);
879 if (!test_and_set_bit(0, &fdc_busy))
885 remove_wait_queue(&fdc_wait, &wait);
890 set_current_state(TASK_RUNNING);
891 remove_wait_queue(&fdc_wait, &wait);
892 flush_scheduled_work();
894 command_status = FD_COMMAND_NONE;
896 __reschedule_timeout(drive, "lock fdc", 0);
901 #define lock_fdc(drive,interruptible) _lock_fdc(drive,interruptible, __LINE__)
903 #define LOCK_FDC(drive,interruptible) \
904 if (lock_fdc(drive,interruptible)) return -EINTR;
906 /* unlocks the driver */
907 static inline void unlock_fdc(void)
912 if (!test_bit(0, &fdc_busy))
913 DPRINT("FDC access conflict!\n");
916 DPRINT("device interrupt still active at FDC release: %p!\n",
918 command_status = FD_COMMAND_NONE;
919 spin_lock_irqsave(&floppy_lock, flags);
920 del_timer(&fd_timeout);
922 clear_bit(0, &fdc_busy);
923 if (elv_next_request(floppy_queue))
924 do_fd_request(floppy_queue);
925 spin_unlock_irqrestore(&floppy_lock, flags);
929 /* switches the motor off after a given timeout */
930 static void motor_off_callback(unsigned long nr)
932 unsigned char mask = ~(0x10 << UNIT(nr));
934 set_dor(FDC(nr), mask, 0);
937 /* schedules motor off */
938 static void floppy_off(unsigned int drive)
940 unsigned long volatile delta;
941 register int fdc = FDC(drive);
943 if (!(FDCS->dor & (0x10 << UNIT(drive))))
946 del_timer(motor_off_timer + drive);
948 /* make spindle stop in a position which minimizes spinup time
951 delta = jiffies - UDRS->first_read_date + HZ -
952 UDP->spindown_offset;
953 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
954 motor_off_timer[drive].expires =
955 jiffies + UDP->spindown - delta;
957 add_timer(motor_off_timer + drive);
961 * cycle through all N_DRIVE floppy drives, for disk change testing.
962 * stopping at current drive. This is done before any long operation, to
963 * be sure to have up to date disk change information.
965 static void scandrives(void)
971 if (DP->select_delay)
974 saved_drive = current_drive;
975 for (i = 0; i < N_DRIVE; i++) {
976 drive = (saved_drive + i + 1) % N_DRIVE;
977 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
978 continue; /* skip closed drives */
980 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
981 (0x10 << UNIT(drive))))
982 /* switch the motor off again, if it was off to
984 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
986 set_fdc(saved_drive);
989 static void empty(void)
993 static DECLARE_WORK(floppy_work, NULL);
995 static void schedule_bh(void (*handler) (void))
997 PREPARE_WORK(&floppy_work, (work_func_t)handler);
998 schedule_work(&floppy_work);
1001 static DEFINE_TIMER(fd_timer, NULL, 0, 0);
1003 static void cancel_activity(void)
1005 unsigned long flags;
1007 spin_lock_irqsave(&floppy_lock, flags);
1009 PREPARE_WORK(&floppy_work, (work_func_t)empty);
1010 del_timer(&fd_timer);
1011 spin_unlock_irqrestore(&floppy_lock, flags);
1014 /* this function makes sure that the disk stays in the drive during the
1016 static void fd_watchdog(void)
1019 if (DP->flags & FD_DEBUG) {
1020 DPRINT("calling disk change from watchdog\n");
1024 if (disk_change(current_drive)) {
1025 DPRINT("disk removed during i/o\n");
1030 del_timer(&fd_timer);
1031 fd_timer.function = (timeout_fn) fd_watchdog;
1032 fd_timer.expires = jiffies + HZ / 10;
1033 add_timer(&fd_timer);
1037 static void main_command_interrupt(void)
1039 del_timer(&fd_timer);
1043 /* waits for a delay (spinup or select) to pass */
1044 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1047 reset_fdc(); /* do the reset during sleep to win time
1048 * if we don't need to sleep, it's a good
1049 * occasion anyways */
1053 if (time_before(jiffies, delay)) {
1054 del_timer(&fd_timer);
1055 fd_timer.function = function;
1056 fd_timer.expires = delay;
1057 add_timer(&fd_timer);
1063 static DEFINE_SPINLOCK(floppy_hlt_lock);
1064 static int hlt_disabled;
1065 static void floppy_disable_hlt(void)
1067 unsigned long flags;
1069 spin_lock_irqsave(&floppy_hlt_lock, flags);
1070 if (!hlt_disabled) {
1072 #ifdef HAVE_DISABLE_HLT
1076 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1079 static void floppy_enable_hlt(void)
1081 unsigned long flags;
1083 spin_lock_irqsave(&floppy_hlt_lock, flags);
1086 #ifdef HAVE_DISABLE_HLT
1090 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1093 static void setup_DMA(void)
1097 #ifdef FLOPPY_SANITY_CHECK
1098 if (raw_cmd->length == 0) {
1101 printk("zero dma transfer size:");
1102 for (i = 0; i < raw_cmd->cmd_count; i++)
1103 printk("%x,", raw_cmd->cmd[i]);
1109 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1110 printk("non aligned address: %p\n", raw_cmd->kernel_data);
1116 f = claim_dma_lock();
1119 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1120 (raw_cmd->flags & FD_RAW_READ) ?
1121 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1122 release_dma_lock(f);
1127 release_dma_lock(f);
1130 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1131 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1132 DMA_MODE_READ : DMA_MODE_WRITE);
1133 fd_set_dma_addr(raw_cmd->kernel_data);
1134 fd_set_dma_count(raw_cmd->length);
1135 virtual_dma_port = FDCS->address;
1137 release_dma_lock(f);
1139 floppy_disable_hlt();
1142 static void show_floppy(void);
1144 /* waits until the fdc becomes ready */
1145 static int wait_til_ready(void)
1152 for (counter = 0; counter < 10000; counter++) {
1153 status = fd_inb(FD_STATUS);
1154 if (status & STATUS_READY)
1157 if (!initialising) {
1158 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1165 /* sends a command byte to the fdc */
1166 static int output_byte(char byte)
1170 if ((status = wait_til_ready()) < 0)
1172 if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY) {
1173 fd_outb(byte, FD_DATA);
1174 #ifdef FLOPPY_SANITY_CHECK
1175 output_log[output_log_pos].data = byte;
1176 output_log[output_log_pos].status = status;
1177 output_log[output_log_pos].jiffies = jiffies;
1178 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1183 if (!initialising) {
1184 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1191 #define LAST_OUT(x) if (output_byte(x)<0){ reset_fdc();return;}
1193 /* gets the response from the fdc */
1194 static int result(void)
1199 for (i = 0; i < MAX_REPLIES; i++) {
1200 if ((status = wait_til_ready()) < 0)
1202 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1203 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1204 #ifdef FLOPPY_SANITY_CHECK
1205 resultjiffies = jiffies;
1210 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1211 reply_buffer[i] = fd_inb(FD_DATA);
1215 if (!initialising) {
1217 ("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)
1231 if ((status = wait_til_ready()) < 0)
1233 if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY)
1238 /* Set perpendicular mode as required, based on data rate, if supported.
1239 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1241 static inline void perpendicular_mode(void)
1243 unsigned char perp_mode;
1245 if (raw_cmd->rate & 0x40) {
1246 switch (raw_cmd->rate & 3) {
1254 DPRINT("Invalid data rate for perpendicular mode!\n");
1256 FDCS->reset = 1; /* convenient way to return to
1257 * redo without to much hassle (deep
1264 if (FDCS->perp_mode == perp_mode)
1266 if (FDCS->version >= FDC_82077_ORIG) {
1267 output_byte(FD_PERPENDICULAR);
1268 output_byte(perp_mode);
1269 FDCS->perp_mode = perp_mode;
1270 } else if (perp_mode) {
1271 DPRINT("perpendicular mode not supported by this FDC.\n");
1273 } /* perpendicular_mode */
1275 static int fifo_depth = 0xa;
1278 static int fdc_configure(void)
1281 output_byte(FD_CONFIGURE);
1282 if (need_more_output() != MORE_OUTPUT)
1285 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1286 output_byte(0); /* pre-compensation from track
1291 #define NOMINAL_DTR 500
1293 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1294 * head load time, and DMA disable flag to values needed by floppy.
1296 * The value "dtr" is the data transfer rate in Kbps. It is needed
1297 * to account for the data rate-based scaling done by the 82072 and 82077
1298 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1301 * Note that changing the data transfer rate has a (probably deleterious)
1302 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1303 * fdc_specify is called again after each data transfer rate
1306 * srt: 1000 to 16000 in microseconds
1307 * hut: 16 to 240 milliseconds
1308 * hlt: 2 to 254 milliseconds
1310 * These values are rounded up to the next highest available delay time.
1312 static void fdc_specify(void)
1314 unsigned char spec1;
1315 unsigned char spec2;
1319 unsigned long dtr = NOMINAL_DTR;
1320 unsigned long scale_dtr = NOMINAL_DTR;
1321 int hlt_max_code = 0x7f;
1322 int hut_max_code = 0xf;
1324 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1326 FDCS->need_configure = 0;
1327 /*DPRINT("FIFO enabled\n"); */
1330 switch (raw_cmd->rate & 0x03) {
1336 if (FDCS->version >= FDC_82078) {
1337 /* chose the default rate table, not the one
1338 * where 1 = 2 Mbps */
1339 output_byte(FD_DRIVESPEC);
1340 if (need_more_output() == MORE_OUTPUT) {
1341 output_byte(UNIT(current_drive));
1351 if (FDCS->version >= FDC_82072) {
1353 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1354 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1357 /* Convert step rate from microseconds to milliseconds and 4 bits */
1358 srt = 16 - (DP->srt * scale_dtr / 1000 + NOMINAL_DTR - 1) / NOMINAL_DTR;
1365 hlt = (DP->hlt * scale_dtr / 2 + NOMINAL_DTR - 1) / NOMINAL_DTR;
1368 else if (hlt > 0x7f)
1371 hut = (DP->hut * scale_dtr / 16 + NOMINAL_DTR - 1) / NOMINAL_DTR;
1377 spec1 = (srt << 4) | hut;
1378 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1380 /* If these parameters did not change, just return with success */
1381 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1382 /* Go ahead and set spec1 and spec2 */
1383 output_byte(FD_SPECIFY);
1384 output_byte(FDCS->spec1 = spec1);
1385 output_byte(FDCS->spec2 = spec2);
1389 /* Set the FDC's data transfer rate on behalf of the specified drive.
1390 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1391 * of the specify command (i.e. using the fdc_specify function).
1393 static int fdc_dtr(void)
1395 /* If data rate not already set to desired value, set it. */
1396 if ((raw_cmd->rate & 3) == FDCS->dtr)
1400 fd_outb(raw_cmd->rate & 3, FD_DCR);
1402 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1403 * need a stabilization period of several milliseconds to be
1404 * enforced after data rate changes before R/W operations.
1405 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1407 FDCS->dtr = raw_cmd->rate & 3;
1408 return (fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1409 (timeout_fn) floppy_ready));
1412 static void tell_sector(void)
1414 printk(": track %d, head %d, sector %d, size %d",
1415 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1419 * OK, this error interpreting routine is called after a
1420 * DMA read/write has succeeded
1421 * or failed, so we check the results, and copy any buffers.
1422 * hhb: Added better error reporting.
1423 * ak: Made this into a separate routine.
1425 static int interpret_errors(void)
1430 DPRINT("-- FDC reply error");
1435 /* check IC to find cause of interrupt */
1436 switch (ST0 & ST0_INTR) {
1437 case 0x40: /* error occurred during command execution */
1439 return 0; /* occurs with pseudo-DMA */
1442 DPRINT("Drive is write protected\n");
1443 CLEARF(FD_DISK_WRITABLE);
1446 } else if (ST1 & ST1_ND) {
1447 SETF(FD_NEED_TWADDLE);
1448 } else if (ST1 & ST1_OR) {
1449 if (DP->flags & FTD_MSG)
1450 DPRINT("Over/Underrun - retrying\n");
1452 } else if (*errors >= DP->max_errors.reporting) {
1454 if (ST0 & ST0_ECE) {
1455 printk("Recalibrate failed!");
1456 } else if (ST2 & ST2_CRC) {
1457 printk("data CRC error");
1459 } else if (ST1 & ST1_CRC) {
1460 printk("CRC error");
1462 } else if ((ST1 & (ST1_MAM | ST1_ND))
1463 || (ST2 & ST2_MAM)) {
1465 printk("sector not found");
1468 printk("probe failed...");
1469 } else if (ST2 & ST2_WC) { /* seek error */
1470 printk("wrong cylinder");
1471 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1472 printk("bad cylinder");
1475 ("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1481 if (ST2 & ST2_WC || ST2 & ST2_BC)
1482 /* wrong cylinder => recal */
1483 DRS->track = NEED_2_RECAL;
1485 case 0x80: /* invalid command given */
1486 DPRINT("Invalid FDC command given!\n");
1490 DPRINT("Abnormal termination caused by polling\n");
1493 default: /* (0) Normal command termination */
1499 * This routine is called when everything should be correctly set up
1500 * for the transfer (i.e. floppy motor is on, the correct floppy is
1501 * selected, and the head is sitting on the right track).
1503 static void setup_rw_floppy(void)
1509 unsigned long ready_date;
1510 timeout_fn function;
1512 flags = raw_cmd->flags;
1513 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1514 flags |= FD_RAW_INTR;
1516 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1517 ready_date = DRS->spinup_date + DP->spinup;
1518 /* If spinup will take a long time, rerun scandrives
1519 * again just before spinup completion. Beware that
1520 * after scandrives, we must again wait for selection.
1522 if (time_after(ready_date, jiffies + DP->select_delay)) {
1523 ready_date -= DP->select_delay;
1524 function = (timeout_fn) floppy_start;
1526 function = (timeout_fn) setup_rw_floppy;
1528 /* wait until the floppy is spinning fast enough */
1529 if (fd_wait_for_completion(ready_date, function))
1532 dflags = DRS->flags;
1534 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1537 if (flags & FD_RAW_INTR)
1538 do_floppy = main_command_interrupt;
1541 for (i = 0; i < raw_cmd->cmd_count; i++)
1542 r |= output_byte(raw_cmd->cmd[i]);
1544 debugt("rw_command: ");
1552 if (!(flags & FD_RAW_INTR)) {
1555 } else if (flags & FD_RAW_NEED_DISK)
1559 static int blind_seek;
1562 * This is the routine called after every seek (or recalibrate) interrupt
1563 * from the floppy controller.
1565 static void seek_interrupt(void)
1567 debugt("seek interrupt:");
1568 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1569 DPRINT("seek failed\n");
1570 DRS->track = NEED_2_RECAL;
1575 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1577 if (DP->flags & FD_DEBUG) {
1579 ("clearing NEWCHANGE flag because of effective seek\n");
1580 DPRINT("jiffies=%lu\n", jiffies);
1583 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1584 DRS->select_date = jiffies;
1590 static void check_wp(void)
1592 if (TESTF(FD_VERIFY)) {
1593 /* check write protection */
1594 output_byte(FD_GETSTATUS);
1595 output_byte(UNIT(current_drive));
1596 if (result() != 1) {
1601 CLEARF(FD_NEED_TWADDLE);
1603 if (DP->flags & FD_DEBUG) {
1604 DPRINT("checking whether disk is write protected\n");
1605 DPRINT("wp=%x\n", ST3 & 0x40);
1609 SETF(FD_DISK_WRITABLE);
1611 CLEARF(FD_DISK_WRITABLE);
1615 static void seek_floppy(void)
1622 if (DP->flags & FD_DEBUG) {
1623 DPRINT("calling disk change from seek\n");
1627 if (!TESTF(FD_DISK_NEWCHANGE) &&
1628 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1629 /* the media changed flag should be cleared after the seek.
1630 * If it isn't, this means that there is really no disk in
1633 SETF(FD_DISK_CHANGED);
1638 if (DRS->track <= NEED_1_RECAL) {
1639 recalibrate_floppy();
1641 } else if (TESTF(FD_DISK_NEWCHANGE) &&
1642 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1643 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1644 /* we seek to clear the media-changed condition. Does anybody
1645 * know a more elegant way, which works on all drives? */
1647 track = raw_cmd->track - 1;
1649 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1650 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1652 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1658 if (raw_cmd->track != DRS->track &&
1659 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1660 track = raw_cmd->track;
1667 do_floppy = seek_interrupt;
1668 output_byte(FD_SEEK);
1669 output_byte(UNIT(current_drive));
1671 debugt("seek command:");
1674 static void recal_interrupt(void)
1676 debugt("recal interrupt:");
1679 else if (ST0 & ST0_ECE) {
1680 switch (DRS->track) {
1682 debugt("recal interrupt need 1 recal:");
1683 /* after a second recalibrate, we still haven't
1684 * reached track 0. Probably no drive. Raise an
1685 * error, as failing immediately might upset
1686 * computers possessed by the Devil :-) */
1691 debugt("recal interrupt need 2 recal:");
1692 /* If we already did a recalibrate,
1693 * and we are not at track 0, this
1694 * means we have moved. (The only way
1695 * not to move at recalibration is to
1696 * be already at track 0.) Clear the
1697 * new change flag */
1699 if (DP->flags & FD_DEBUG) {
1701 ("clearing NEWCHANGE flag because of second recalibrate\n");
1705 CLEARF(FD_DISK_NEWCHANGE);
1706 DRS->select_date = jiffies;
1709 debugt("recal interrupt default:");
1710 /* Recalibrate moves the head by at
1711 * most 80 steps. If after one
1712 * recalibrate we don't have reached
1713 * track 0, this might mean that we
1714 * started beyond track 80. Try
1716 DRS->track = NEED_1_RECAL;
1724 static void print_result(char *message, int inr)
1728 DPRINT("%s ", message);
1730 for (i = 0; i < inr; i++)
1731 printk("repl[%d]=%x ", i, reply_buffer[i]);
1735 /* interrupt handler. Note that this can be called externally on the Sparc */
1736 irqreturn_t floppy_interrupt(int irq, void *dev_id)
1740 void (*handler)(void) = do_floppy;
1742 lasthandler = handler;
1743 interruptjiffies = jiffies;
1745 f = claim_dma_lock();
1747 release_dma_lock(f);
1749 floppy_enable_hlt();
1751 if (fdc >= N_FDC || FDCS->address == -1) {
1752 /* we don't even know which FDC is the culprit */
1753 printk("DOR0=%x\n", fdc_state[0].dor);
1754 printk("floppy interrupt on bizarre fdc %d\n", fdc);
1755 printk("handler=%p\n", handler);
1756 is_alive("bizarre fdc");
1761 /* We have to clear the reset flag here, because apparently on boxes
1762 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1763 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1764 * emission of the SENSEI's.
1765 * It is OK to emit floppy commands because we are in an interrupt
1766 * handler here, and thus we have to fear no interference of other
1770 do_print = !handler && print_unex && !initialising;
1774 print_result("unexpected interrupt", inr);
1778 output_byte(FD_SENSEI);
1781 print_result("sensei", inr);
1783 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2
1790 schedule_bh(handler);
1791 is_alive("normal interrupt end");
1793 /* FIXME! Was it really for us? */
1797 static void recalibrate_floppy(void)
1799 debugt("recalibrate floppy:");
1800 do_floppy = recal_interrupt;
1801 output_byte(FD_RECALIBRATE);
1802 LAST_OUT(UNIT(current_drive));
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 printk("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 printk("floppy driver state\n");
1853 printk("-------------------\n");
1854 printk("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n",
1855 jiffies, interruptjiffies, jiffies - interruptjiffies,
1858 #ifdef FLOPPY_SANITY_CHECK
1859 printk("timeout_message=%s\n", timeout_message);
1860 printk("last output bytes:\n");
1861 for (i = 0; i < OLOGSIZE; i++)
1862 printk("%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 printk("last result at %lu\n", resultjiffies);
1867 printk("last redo_fd_request at %lu\n", lastredo);
1868 for (i = 0; i < resultsize; i++) {
1869 printk("%2x ", reply_buffer[i]);
1874 printk("status=%x\n", fd_inb(FD_STATUS));
1875 printk("fdc_busy=%lu\n", fdc_busy);
1877 printk("do_floppy=%p\n", do_floppy);
1878 if (work_pending(&floppy_work))
1879 printk("floppy_work.func=%p\n", floppy_work.func);
1880 if (timer_pending(&fd_timer))
1881 printk("fd_timer.function=%p\n", fd_timer.function);
1882 if (timer_pending(&fd_timeout)) {
1883 printk("timer_function=%p\n", fd_timeout.function);
1884 printk("expires=%lu\n", fd_timeout.expires - jiffies);
1885 printk("now=%lu\n", jiffies);
1887 printk("cont=%p\n", cont);
1888 printk("current_req=%p\n", current_req);
1889 printk("command_status=%d\n", command_status);
1893 static void floppy_shutdown(unsigned long data)
1895 unsigned long flags;
1901 floppy_enable_hlt();
1903 flags = claim_dma_lock();
1905 release_dma_lock(flags);
1907 /* avoid dma going to a random drive after shutdown */
1910 DPRINT("floppy timeout called\n");
1914 cont->redo(); /* this will recall reset when needed */
1916 printk("no cont in shutdown!\n");
1917 process_fd_request();
1919 is_alive("floppy shutdown");
1922 /*typedef void (*timeout_fn)(unsigned long);*/
1924 /* start motor, check media-changed condition and write protection */
1925 static int start_motor(void (*function)(void))
1931 data = UNIT(current_drive);
1932 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1933 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1935 /* no read since this drive is running */
1936 DRS->first_read_date = 0;
1937 /* note motor start time if motor is not yet running */
1938 DRS->spinup_date = jiffies;
1939 data |= (0x10 << UNIT(current_drive));
1941 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1942 mask &= ~(0x10 << UNIT(current_drive));
1944 /* starts motor and selects floppy */
1945 del_timer(motor_off_timer + current_drive);
1946 set_dor(fdc, mask, data);
1948 /* wait_for_completion also schedules reset if needed. */
1949 return (fd_wait_for_completion(DRS->select_date + DP->select_delay,
1950 (timeout_fn) function));
1953 static void floppy_ready(void)
1956 if (start_motor(floppy_ready))
1962 if (DP->flags & FD_DEBUG) {
1963 DPRINT("calling disk change from floppy_ready\n");
1966 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1967 disk_change(current_drive) && !DP->select_delay)
1968 twaddle(); /* this clears the dcl on certain drive/controller
1971 #ifdef fd_chose_dma_mode
1972 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1973 unsigned long flags = claim_dma_lock();
1974 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1975 release_dma_lock(flags);
1979 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1980 perpendicular_mode();
1981 fdc_specify(); /* must be done here because of hut, hlt ... */
1984 if ((raw_cmd->flags & FD_RAW_READ) ||
1985 (raw_cmd->flags & FD_RAW_WRITE))
1991 static void floppy_start(void)
1993 reschedule_timeout(current_reqD, "floppy start", 0);
1997 if (DP->flags & FD_DEBUG) {
1998 DPRINT("setting NEWCHANGE in floppy_start\n");
2001 SETF(FD_DISK_NEWCHANGE);
2006 * ========================================================================
2007 * here ends the bottom half. Exported routines are:
2008 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
2009 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
2010 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
2012 * ========================================================================
2015 * General purpose continuations.
2016 * ==============================
2019 static void do_wakeup(void)
2021 reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
2023 command_status += 2;
2024 wake_up(&command_done);
2027 static struct cont_t wakeup_cont = {
2031 .done = (done_f)empty
2034 static struct cont_t intr_cont = {
2036 .redo = process_fd_request,
2038 .done = (done_f)empty
2041 static int wait_til_done(void (*handler)(void), int interruptible)
2045 schedule_bh(handler);
2047 if (command_status < 2 && NO_SIGNAL) {
2048 DECLARE_WAITQUEUE(wait, current);
2050 add_wait_queue(&command_done, &wait);
2052 set_current_state(interruptible ?
2053 TASK_INTERRUPTIBLE :
2054 TASK_UNINTERRUPTIBLE);
2056 if (command_status >= 2 || !NO_SIGNAL)
2059 is_alive("wait_til_done");
2063 set_current_state(TASK_RUNNING);
2064 remove_wait_queue(&command_done, &wait);
2067 if (command_status < 2) {
2075 command_status = FD_COMMAND_ERROR;
2076 if (command_status == FD_COMMAND_OKAY)
2080 command_status = FD_COMMAND_NONE;
2084 static void generic_done(int result)
2086 command_status = result;
2087 cont = &wakeup_cont;
2090 static void generic_success(void)
2095 static void generic_failure(void)
2100 static void success_and_wakeup(void)
2107 * formatting and rw support.
2108 * ==========================
2111 static int next_valid_format(void)
2115 probed_format = DRS->probed_format;
2117 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2118 DRS->probed_format = 0;
2121 if (floppy_type[DP->autodetect[probed_format]].sect) {
2122 DRS->probed_format = probed_format;
2129 static void bad_flp_intr(void)
2134 DRS->probed_format++;
2135 if (!next_valid_format())
2138 err_count = ++(*errors);
2139 INFBOUND(DRWE->badness, err_count);
2140 if (err_count > DP->max_errors.abort)
2142 if (err_count > DP->max_errors.reset)
2144 else if (err_count > DP->max_errors.recal)
2145 DRS->track = NEED_2_RECAL;
2148 static void set_floppy(int drive)
2150 int type = ITYPE(UDRS->fd_device);
2153 _floppy = floppy_type + type;
2155 _floppy = current_type[drive];
2159 * formatting support.
2160 * ===================
2162 static void format_interrupt(void)
2164 switch (interpret_errors()) {
2175 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
2176 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
2177 #define CT(x) ((x) | 0xc0)
2178 static void setup_format_params(int track)
2186 unsigned char track, head, sect, size;
2187 } *here = (struct fparm *)floppy_track_buffer;
2189 raw_cmd = &default_raw_cmd;
2190 raw_cmd->track = track;
2192 raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2193 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2194 raw_cmd->rate = _floppy->rate & 0x43;
2195 raw_cmd->cmd_count = NR_F;
2196 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2197 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2198 F_SIZECODE = FD_SIZECODE(_floppy);
2199 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2200 F_GAP = _floppy->fmt_gap;
2201 F_FILL = FD_FILL_BYTE;
2203 raw_cmd->kernel_data = floppy_track_buffer;
2204 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2206 /* allow for about 30ms for data transport per track */
2207 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2209 /* a ``cylinder'' is two tracks plus a little stepping time */
2210 track_shift = 2 * head_shift + 3;
2212 /* position of logical sector 1 on this track */
2213 n = (track_shift * format_req.track + head_shift * format_req.head)
2216 /* determine interleave */
2218 if (_floppy->fmt_gap < 0x22)
2221 /* initialize field */
2222 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2223 here[count].track = format_req.track;
2224 here[count].head = format_req.head;
2225 here[count].sect = 0;
2226 here[count].size = F_SIZECODE;
2228 /* place logical sectors */
2229 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2230 here[n].sect = count;
2231 n = (n + il) % F_SECT_PER_TRACK;
2232 if (here[n].sect) { /* sector busy, find next free sector */
2234 if (n >= F_SECT_PER_TRACK) {
2235 n -= F_SECT_PER_TRACK;
2236 while (here[n].sect)
2241 if (_floppy->stretch & FD_ZEROBASED) {
2242 for (count = 0; count < F_SECT_PER_TRACK; count++)
2247 static void redo_format(void)
2250 setup_format_params(format_req.track << STRETCH(_floppy));
2252 debugt("queue format request");
2255 static struct cont_t format_cont = {
2256 .interrupt = format_interrupt,
2257 .redo = redo_format,
2258 .error = bad_flp_intr,
2259 .done = generic_done
2262 static int do_format(int drive, struct format_descr *tmp_format_req)
2269 _floppy->track > DP->tracks ||
2270 tmp_format_req->track >= _floppy->track ||
2271 tmp_format_req->head >= _floppy->head ||
2272 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2273 !_floppy->fmt_gap) {
2274 process_fd_request();
2277 format_req = *tmp_format_req;
2279 cont = &format_cont;
2280 errors = &format_errors;
2282 process_fd_request();
2287 * Buffer read/write and support
2288 * =============================
2291 static void floppy_end_request(struct request *req, int uptodate)
2293 unsigned int nr_sectors = current_count_sectors;
2295 /* current_count_sectors can be zero if transfer failed */
2297 nr_sectors = req->current_nr_sectors;
2298 if (end_that_request_first(req, uptodate, nr_sectors))
2300 add_disk_randomness(req->rq_disk);
2301 floppy_off((long)req->rq_disk->private_data);
2302 blkdev_dequeue_request(req);
2303 end_that_request_last(req, uptodate);
2305 /* We're done with the request */
2309 /* new request_done. Can handle physical sectors which are smaller than a
2311 static void request_done(int uptodate)
2313 struct request_queue *q = floppy_queue;
2314 struct request *req = current_req;
2315 unsigned long flags;
2319 reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2322 printk("floppy.c: no request in request_done\n");
2327 /* maintain values for invalidation on geometry
2329 block = current_count_sectors + req->sector;
2330 INFBOUND(DRS->maxblock, block);
2331 if (block > _floppy->sect)
2334 /* unlock chained buffers */
2335 spin_lock_irqsave(q->queue_lock, flags);
2336 floppy_end_request(req, 1);
2337 spin_unlock_irqrestore(q->queue_lock, flags);
2339 if (rq_data_dir(req) == WRITE) {
2340 /* record write error information */
2341 DRWE->write_errors++;
2342 if (DRWE->write_errors == 1) {
2343 DRWE->first_error_sector = req->sector;
2344 DRWE->first_error_generation = DRS->generation;
2346 DRWE->last_error_sector = req->sector;
2347 DRWE->last_error_generation = DRS->generation;
2349 spin_lock_irqsave(q->queue_lock, flags);
2350 floppy_end_request(req, 0);
2351 spin_unlock_irqrestore(q->queue_lock, flags);
2355 /* Interrupt handler evaluating the result of the r/w operation */
2356 static void rw_interrupt(void)
2364 /* some Toshiba floppy controllers occasionnally seem to
2365 * return bogus interrupts after read/write operations, which
2366 * can be recognized by a bad head number (>= 2) */
2370 if (!DRS->first_read_date)
2371 DRS->first_read_date = jiffies;
2386 nr_sectors = (((R_TRACK - TRACK) * heads +
2387 R_HEAD - HEAD) * SECT_PER_TRACK +
2388 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2390 #ifdef FLOPPY_SANITY_CHECK
2391 if (nr_sectors / ssize >
2392 (in_sector_offset + current_count_sectors + ssize - 1) / ssize) {
2393 DPRINT("long rw: %x instead of %lx\n",
2394 nr_sectors, current_count_sectors);
2395 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2396 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2397 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2398 printk("heads=%d eoc=%d\n", heads, eoc);
2399 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2401 printk("in_sector_offset=%d\n", in_sector_offset);
2405 nr_sectors -= in_sector_offset;
2406 INFBOUND(nr_sectors, 0);
2407 SUPBOUND(current_count_sectors, nr_sectors);
2409 switch (interpret_errors()) {
2414 if (!current_count_sectors) {
2421 if (!current_count_sectors) {
2425 current_type[current_drive] = _floppy;
2426 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2431 if (DP->flags & FTD_MSG)
2432 DPRINT("Auto-detected floppy type %s in fd%d\n",
2433 _floppy->name, current_drive);
2434 current_type[current_drive] = _floppy;
2435 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2439 if (CT(COMMAND) != FD_READ ||
2440 raw_cmd->kernel_data == current_req->buffer) {
2441 /* transfer directly from buffer */
2443 } else if (CT(COMMAND) == FD_READ) {
2444 buffer_track = raw_cmd->track;
2445 buffer_drive = current_drive;
2446 INFBOUND(buffer_max, nr_sectors + fsector_t);
2451 /* Compute maximal contiguous buffer size. */
2452 static int buffer_chain_size(void)
2456 struct req_iterator iter;
2459 base = bio_data(current_req->bio);
2462 rq_for_each_segment(bv, current_req, iter) {
2463 if (page_address(bv->bv_page) + bv->bv_offset != base + size)
2472 /* Compute the maximal transfer size */
2473 static int transfer_size(int ssize, int max_sector, int max_size)
2475 SUPBOUND(max_sector, fsector_t + max_size);
2478 max_sector -= (max_sector % _floppy->sect) % ssize;
2480 /* transfer size, beginning not aligned */
2481 current_count_sectors = max_sector - fsector_t;
2487 * Move data from/to the track buffer to/from the buffer cache.
2489 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2491 int remaining; /* number of transferred 512-byte sectors */
2496 struct req_iterator iter;
2498 max_sector = transfer_size(ssize,
2499 min(max_sector, max_sector_2),
2500 current_req->nr_sectors);
2502 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2503 buffer_max > fsector_t + current_req->nr_sectors)
2504 current_count_sectors = min_t(int, buffer_max - fsector_t,
2505 current_req->nr_sectors);
2507 remaining = current_count_sectors << 9;
2508 #ifdef FLOPPY_SANITY_CHECK
2509 if ((remaining >> 9) > current_req->nr_sectors &&
2510 CT(COMMAND) == FD_WRITE) {
2511 DPRINT("in copy buffer\n");
2512 printk("current_count_sectors=%ld\n", current_count_sectors);
2513 printk("remaining=%d\n", remaining >> 9);
2514 printk("current_req->nr_sectors=%ld\n",
2515 current_req->nr_sectors);
2516 printk("current_req->current_nr_sectors=%u\n",
2517 current_req->current_nr_sectors);
2518 printk("max_sector=%d\n", max_sector);
2519 printk("ssize=%d\n", ssize);
2523 buffer_max = max(max_sector, buffer_max);
2525 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2527 size = current_req->current_nr_sectors << 9;
2529 rq_for_each_segment(bv, current_req, iter) {
2534 SUPBOUND(size, remaining);
2536 buffer = page_address(bv->bv_page) + bv->bv_offset;
2537 #ifdef FLOPPY_SANITY_CHECK
2538 if (dma_buffer + size >
2539 floppy_track_buffer + (max_buffer_sectors << 10) ||
2540 dma_buffer < floppy_track_buffer) {
2541 DPRINT("buffer overrun in copy buffer %d\n",
2542 (int)((floppy_track_buffer -
2544 printk("fsector_t=%d buffer_min=%d\n",
2545 fsector_t, buffer_min);
2546 printk("current_count_sectors=%ld\n",
2547 current_count_sectors);
2548 if (CT(COMMAND) == FD_READ)
2550 if (CT(COMMAND) == FD_WRITE)
2554 if (((unsigned long)buffer) % 512)
2555 DPRINT("%p buffer not aligned\n", buffer);
2557 if (CT(COMMAND) == FD_READ)
2558 memcpy(buffer, dma_buffer, size);
2560 memcpy(dma_buffer, buffer, size);
2565 #ifdef FLOPPY_SANITY_CHECK
2568 max_sector -= remaining >> 9;
2569 DPRINT("weirdness: remaining %d\n", remaining >> 9);
2575 static inline int check_dma_crossing(char *start,
2576 unsigned long length, char *message)
2578 if (CROSS_64KB(start, length)) {
2579 printk("DMA xfer crosses 64KB boundary in %s %p-%p\n",
2580 message, start, start + length);
2587 /* work around a bug in pseudo DMA
2588 * (on some FDCs) pseudo DMA does not stop when the CPU stops
2589 * sending data. Hence we need a different way to signal the
2590 * transfer length: We use SECT_PER_TRACK. Unfortunately, this
2591 * does not work with MT, hence we can only transfer one head at
2594 static void virtualdmabug_workaround(void)
2599 if (CT(COMMAND) == FD_WRITE) {
2600 COMMAND &= ~0x80; /* switch off multiple track mode */
2602 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2603 end_sector = SECTOR + hard_sectors - 1;
2604 #ifdef FLOPPY_SANITY_CHECK
2605 if (end_sector > SECT_PER_TRACK) {
2606 printk("too many sectors %d > %d\n",
2607 end_sector, SECT_PER_TRACK);
2611 SECT_PER_TRACK = end_sector; /* make sure SECT_PER_TRACK points
2612 * to end of transfer */
2617 * Formulate a read/write request.
2618 * this routine decides where to load the data (directly to buffer, or to
2619 * tmp floppy area), how much data to load (the size of the buffer, the whole
2620 * track, or a single sector)
2621 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2622 * allocation on the fly, it should be done here. No other part should need
2626 static int make_raw_rw_request(void)
2628 int aligned_sector_t;
2634 if (max_buffer_sectors == 0) {
2635 printk("VFS: Block I/O scheduled on unopened device\n");
2639 set_fdc((long)current_req->rq_disk->private_data);
2641 raw_cmd = &default_raw_cmd;
2642 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2644 raw_cmd->cmd_count = NR_RW;
2645 if (rq_data_dir(current_req) == READ) {
2646 raw_cmd->flags |= FD_RAW_READ;
2647 COMMAND = FM_MODE(_floppy, FD_READ);
2648 } else if (rq_data_dir(current_req) == WRITE) {
2649 raw_cmd->flags |= FD_RAW_WRITE;
2650 COMMAND = FM_MODE(_floppy, FD_WRITE);
2652 DPRINT("make_raw_rw_request: unknown command\n");
2656 max_sector = _floppy->sect * _floppy->head;
2658 TRACK = (int)current_req->sector / max_sector;
2659 fsector_t = (int)current_req->sector % max_sector;
2660 if (_floppy->track && TRACK >= _floppy->track) {
2661 if (current_req->current_nr_sectors & 1) {
2662 current_count_sectors = 1;
2667 HEAD = fsector_t / _floppy->sect;
2669 if (((_floppy->stretch & (FD_SWAPSIDES | FD_ZEROBASED)) ||
2670 TESTF(FD_NEED_TWADDLE)) && fsector_t < _floppy->sect)
2671 max_sector = _floppy->sect;
2673 /* 2M disks have phantom sectors on the first track */
2674 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2675 max_sector = 2 * _floppy->sect / 3;
2676 if (fsector_t >= max_sector) {
2677 current_count_sectors =
2678 min_t(int, _floppy->sect - fsector_t,
2679 current_req->nr_sectors);
2684 SIZECODE = FD_SIZECODE(_floppy);
2685 raw_cmd->rate = _floppy->rate & 0x43;
2686 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2693 raw_cmd->track = TRACK << STRETCH(_floppy);
2694 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2697 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2698 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2699 ((_floppy->stretch & FD_ZEROBASED) ? 0 : 1);
2701 /* tracksize describes the size which can be filled up with sectors
2704 tracksize = _floppy->sect - _floppy->sect % ssize;
2705 if (tracksize < _floppy->sect) {
2707 if (tracksize <= fsector_t % _floppy->sect)
2710 /* if we are beyond tracksize, fill up using smaller sectors */
2711 while (tracksize <= fsector_t % _floppy->sect) {
2712 while (tracksize + ssize > _floppy->sect) {
2720 max_sector = HEAD * _floppy->sect + tracksize;
2721 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2722 max_sector = _floppy->sect;
2723 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2724 /* for virtual DMA bug workaround */
2725 max_sector = _floppy->sect;
2728 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2729 aligned_sector_t = fsector_t - in_sector_offset;
2730 max_size = current_req->nr_sectors;
2731 if ((raw_cmd->track == buffer_track) &&
2732 (current_drive == buffer_drive) &&
2733 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2734 /* data already in track buffer */
2735 if (CT(COMMAND) == FD_READ) {
2736 copy_buffer(1, max_sector, buffer_max);
2739 } else if (in_sector_offset || current_req->nr_sectors < ssize) {
2740 if (CT(COMMAND) == FD_WRITE) {
2741 if (fsector_t + current_req->nr_sectors > ssize &&
2742 fsector_t + current_req->nr_sectors < ssize + ssize)
2743 max_size = ssize + ssize;
2747 raw_cmd->flags &= ~FD_RAW_WRITE;
2748 raw_cmd->flags |= FD_RAW_READ;
2749 COMMAND = FM_MODE(_floppy, FD_READ);
2750 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2751 unsigned long dma_limit;
2752 int direct, indirect;
2755 transfer_size(ssize, max_sector,
2756 max_buffer_sectors * 2) - fsector_t;
2759 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2760 * on a 64 bit machine!
2762 max_size = buffer_chain_size();
2765 ((unsigned long)current_req->buffer)) >> 9;
2766 if ((unsigned long)max_size > dma_limit) {
2767 max_size = dma_limit;
2769 /* 64 kb boundaries */
2770 if (CROSS_64KB(current_req->buffer, max_size << 9))
2772 ((unsigned long)current_req->buffer) %
2774 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2776 * We try to read tracks, but if we get too many errors, we
2777 * go back to reading just one sector at a time.
2779 * This means we should be able to read a sector even if there
2780 * are other bad sectors on this track.
2783 (indirect * 2 > direct * 3 &&
2784 *errors < DP->max_errors.read_track &&
2785 /*!TESTF(FD_NEED_TWADDLE) && */
2787 || (DP->read_track & (1 << DRS->probed_format)))))) {
2788 max_size = current_req->nr_sectors;
2790 raw_cmd->kernel_data = current_req->buffer;
2791 raw_cmd->length = current_count_sectors << 9;
2792 if (raw_cmd->length == 0) {
2794 ("zero dma transfer attempted from make_raw_request\n");
2795 DPRINT("indirect=%d direct=%d fsector_t=%d",
2796 indirect, direct, fsector_t);
2799 /* check_dma_crossing(raw_cmd->kernel_data,
2801 "end of make_raw_request [1]");*/
2803 virtualdmabug_workaround();
2808 if (CT(COMMAND) == FD_READ)
2809 max_size = max_sector; /* unbounded */
2811 /* claim buffer track if needed */
2812 if (buffer_track != raw_cmd->track || /* bad track */
2813 buffer_drive != current_drive || /* bad drive */
2814 fsector_t > buffer_max ||
2815 fsector_t < buffer_min ||
2816 ((CT(COMMAND) == FD_READ ||
2817 (!in_sector_offset && current_req->nr_sectors >= ssize)) &&
2818 max_sector > 2 * max_buffer_sectors + buffer_min &&
2819 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)
2820 /* not enough space */
2823 buffer_drive = current_drive;
2824 buffer_max = buffer_min = aligned_sector_t;
2826 raw_cmd->kernel_data = floppy_track_buffer +
2827 ((aligned_sector_t - buffer_min) << 9);
2829 if (CT(COMMAND) == FD_WRITE) {
2830 /* copy write buffer to track buffer.
2831 * if we get here, we know that the write
2832 * is either aligned or the data already in the buffer
2833 * (buffer will be overwritten) */
2834 #ifdef FLOPPY_SANITY_CHECK
2835 if (in_sector_offset && buffer_track == -1)
2836 DPRINT("internal error offset !=0 on write\n");
2838 buffer_track = raw_cmd->track;
2839 buffer_drive = current_drive;
2840 copy_buffer(ssize, max_sector,
2841 2 * max_buffer_sectors + buffer_min);
2843 transfer_size(ssize, max_sector,
2844 2 * max_buffer_sectors + buffer_min -
2847 /* round up current_count_sectors to get dma xfer size */
2848 raw_cmd->length = in_sector_offset + current_count_sectors;
2849 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2850 raw_cmd->length <<= 9;
2851 #ifdef FLOPPY_SANITY_CHECK
2852 /*check_dma_crossing(raw_cmd->kernel_data, raw_cmd->length,
2853 "end of make_raw_request"); */
2854 if ((raw_cmd->length < current_count_sectors << 9) ||
2855 (raw_cmd->kernel_data != current_req->buffer &&
2856 CT(COMMAND) == FD_WRITE &&
2857 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2858 aligned_sector_t < buffer_min)) ||
2859 raw_cmd->length % (128 << SIZECODE) ||
2860 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2861 DPRINT("fractionary current count b=%lx s=%lx\n",
2862 raw_cmd->length, current_count_sectors);
2863 if (raw_cmd->kernel_data != current_req->buffer)
2864 printk("addr=%d, length=%ld\n",
2865 (int)((raw_cmd->kernel_data -
2866 floppy_track_buffer) >> 9),
2867 current_count_sectors);
2868 printk("st=%d ast=%d mse=%d msi=%d\n",
2869 fsector_t, aligned_sector_t, max_sector, max_size);
2870 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2871 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2872 COMMAND, SECTOR, HEAD, TRACK);
2873 printk("buffer drive=%d\n", buffer_drive);
2874 printk("buffer track=%d\n", buffer_track);
2875 printk("buffer_min=%d\n", buffer_min);
2876 printk("buffer_max=%d\n", buffer_max);
2880 if (raw_cmd->kernel_data != current_req->buffer) {
2881 if (raw_cmd->kernel_data < floppy_track_buffer ||
2882 current_count_sectors < 0 ||
2883 raw_cmd->length < 0 ||
2884 raw_cmd->kernel_data + raw_cmd->length >
2885 floppy_track_buffer + (max_buffer_sectors << 10)) {
2886 DPRINT("buffer overrun in schedule dma\n");
2887 printk("fsector_t=%d buffer_min=%d current_count=%ld\n",
2888 fsector_t, buffer_min, raw_cmd->length >> 9);
2889 printk("current_count_sectors=%ld\n",
2890 current_count_sectors);
2891 if (CT(COMMAND) == FD_READ)
2893 if (CT(COMMAND) == FD_WRITE)
2897 } else if (raw_cmd->length > current_req->nr_sectors << 9 ||
2898 current_count_sectors > current_req->nr_sectors) {
2899 DPRINT("buffer overrun in direct transfer\n");
2901 } else if (raw_cmd->length < current_count_sectors << 9) {
2902 DPRINT("more sectors than bytes\n");
2903 printk("bytes=%ld\n", raw_cmd->length >> 9);
2904 printk("sectors=%ld\n", current_count_sectors);
2906 if (raw_cmd->length == 0) {
2907 DPRINT("zero dma transfer attempted from make_raw_request\n");
2912 virtualdmabug_workaround();
2916 static void redo_fd_request(void)
2918 #define REPEAT {request_done(0); continue; }
2923 if (current_drive < N_DRIVE)
2924 floppy_off(current_drive);
2928 struct request *req;
2930 spin_lock_irq(floppy_queue->queue_lock);
2931 req = elv_next_request(floppy_queue);
2932 spin_unlock_irq(floppy_queue->queue_lock);
2940 drive = (long)current_req->rq_disk->private_data;
2942 reschedule_timeout(current_reqD, "redo fd request", 0);
2945 raw_cmd = &default_raw_cmd;
2947 if (start_motor(redo_fd_request))
2949 disk_change(current_drive);
2950 if (test_bit(current_drive, &fake_change) ||
2951 TESTF(FD_DISK_CHANGED)) {
2952 DPRINT("disk absent or changed during operation\n");
2955 if (!_floppy) { /* Autodetection */
2957 DRS->probed_format = 0;
2958 if (next_valid_format()) {
2959 DPRINT("no autodetectable formats\n");
2966 floppy_type + DP->autodetect[DRS->probed_format];
2969 errors = &(current_req->errors);
2970 tmp = make_raw_rw_request();
2976 if (TESTF(FD_NEED_TWADDLE))
2978 schedule_bh(floppy_start);
2979 debugt("queue fd request");
2985 static struct cont_t rw_cont = {
2986 .interrupt = rw_interrupt,
2987 .redo = redo_fd_request,
2988 .error = bad_flp_intr,
2989 .done = request_done
2992 static void process_fd_request(void)
2995 schedule_bh(redo_fd_request);
2998 static void do_fd_request(struct request_queue * q)
3000 if (max_buffer_sectors == 0) {
3001 printk("VFS: do_fd_request called on non-open device\n");
3005 if (usage_count == 0) {
3006 printk("warning: usage count=0, current_req=%p exiting\n",
3008 printk("sect=%ld type=%x flags=%x\n", (long)current_req->sector,
3009 current_req->cmd_type, current_req->cmd_flags);
3012 if (test_bit(0, &fdc_busy)) {
3013 /* fdc busy, this new request will be treated when the
3014 current one is done */
3015 is_alive("do fd request, old request running");
3018 lock_fdc(MAXTIMEOUT, 0);
3019 process_fd_request();
3020 is_alive("do fd request");
3023 static struct cont_t poll_cont = {
3024 .interrupt = success_and_wakeup,
3025 .redo = floppy_ready,
3026 .error = generic_failure,
3027 .done = generic_done
3030 static int poll_drive(int interruptible, int flag)
3034 /* no auto-sense, just clear dcl */
3035 raw_cmd = &default_raw_cmd;
3036 raw_cmd->flags = flag;
3038 raw_cmd->cmd_count = 0;
3041 if (DP->flags & FD_DEBUG) {
3042 DPRINT("setting NEWCHANGE in poll_drive\n");
3045 SETF(FD_DISK_NEWCHANGE);
3051 * User triggered reset
3052 * ====================
3055 static void reset_intr(void)
3057 printk("weird, reset interrupt called\n");
3060 static struct cont_t reset_cont = {
3061 .interrupt = reset_intr,
3062 .redo = success_and_wakeup,
3063 .error = generic_failure,
3064 .done = generic_done
3067 static int user_reset_fdc(int drive, int arg, int interruptible)
3072 LOCK_FDC(drive, interruptible);
3073 if (arg == FD_RESET_ALWAYS)
3079 process_fd_request();
3084 * Misc Ioctl's and support
3085 * ========================
3087 static inline int fd_copyout(void __user *param, const void *address,
3090 return copy_to_user(param, address, size) ? -EFAULT : 0;
3093 static inline int fd_copyin(void __user *param, void *address, unsigned long size)
3095 return copy_from_user(address, param, size) ? -EFAULT : 0;
3098 #define _COPYOUT(x) (copy_to_user((void __user *)param, &(x), sizeof(x)) ? -EFAULT : 0)
3099 #define _COPYIN(x) (copy_from_user(&(x), (void __user *)param, sizeof(x)) ? -EFAULT : 0)
3101 #define COPYOUT(x) ECALL(_COPYOUT(x))
3102 #define COPYIN(x) ECALL(_COPYIN(x))
3104 static inline const char *drive_name(int type, int drive)
3106 struct floppy_struct *floppy;
3109 floppy = floppy_type + type;
3111 if (UDP->native_format)
3112 floppy = floppy_type + UDP->native_format;
3117 return floppy->name;
3123 static void raw_cmd_done(int flag)
3128 raw_cmd->flags |= FD_RAW_FAILURE;
3129 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3131 raw_cmd->reply_count = inr;
3132 if (raw_cmd->reply_count > MAX_REPLIES)
3133 raw_cmd->reply_count = 0;
3134 for (i = 0; i < raw_cmd->reply_count; i++)
3135 raw_cmd->reply[i] = reply_buffer[i];
3137 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3138 unsigned long flags;
3139 flags = claim_dma_lock();
3140 raw_cmd->length = fd_get_dma_residue();
3141 release_dma_lock(flags);
3144 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3145 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3146 raw_cmd->flags |= FD_RAW_FAILURE;
3148 if (disk_change(current_drive))
3149 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3151 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3152 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3153 motor_off_callback(current_drive);
3155 if (raw_cmd->next &&
3156 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3157 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3158 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3159 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3160 raw_cmd = raw_cmd->next;
3167 static struct cont_t raw_cmd_cont = {
3168 .interrupt = success_and_wakeup,
3169 .redo = floppy_start,
3170 .error = generic_failure,
3171 .done = raw_cmd_done
3174 static inline int raw_cmd_copyout(int cmd, char __user *param,
3175 struct floppy_raw_cmd *ptr)
3181 param += sizeof(struct floppy_raw_cmd);
3182 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3183 if (ptr->length >= 0
3184 && ptr->length <= ptr->buffer_length)
3186 (ptr->data, ptr->kernel_data,
3187 ptr->buffer_length - ptr->length));
3194 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3196 struct floppy_raw_cmd *next;
3197 struct floppy_raw_cmd *this;
3202 if (this->buffer_length) {
3203 fd_dma_mem_free((unsigned long)this->kernel_data,
3204 this->buffer_length);
3205 this->buffer_length = 0;
3213 static inline int raw_cmd_copyin(int cmd, char __user *param,
3214 struct floppy_raw_cmd **rcmd)
3216 struct floppy_raw_cmd *ptr;
3222 ptr = (struct floppy_raw_cmd *)
3223 kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3229 ptr->buffer_length = 0;
3230 param += sizeof(struct floppy_raw_cmd);
3231 if (ptr->cmd_count > 33)
3232 /* the command may now also take up the space
3233 * initially intended for the reply & the
3234 * reply count. Needed for long 82078 commands
3235 * such as RESTORE, which takes ... 17 command
3236 * bytes. Murphy's law #137: When you reserve
3237 * 16 bytes for a structure, you'll one day
3238 * discover that you really need 17...
3242 for (i = 0; i < 16; i++)
3244 ptr->resultcode = 0;
3245 ptr->kernel_data = NULL;
3247 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3248 if (ptr->length <= 0)
3251 (char *)fd_dma_mem_alloc(ptr->length);
3252 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3253 if (!ptr->kernel_data)
3255 ptr->buffer_length = ptr->length;
3257 if (ptr->flags & FD_RAW_WRITE)
3258 ECALL(fd_copyin(ptr->data, ptr->kernel_data,
3260 rcmd = &(ptr->next);
3261 if (!(ptr->flags & FD_RAW_MORE))
3267 static int raw_cmd_ioctl(int cmd, void __user *param)
3269 struct floppy_raw_cmd *my_raw_cmd;
3274 if (FDCS->rawcmd <= 1)
3276 for (drive = 0; drive < N_DRIVE; drive++) {
3277 if (FDC(drive) != fdc)
3279 if (drive == current_drive) {
3280 if (UDRS->fd_ref > 1) {
3284 } else if (UDRS->fd_ref) {
3293 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3295 raw_cmd_free(&my_raw_cmd);
3299 raw_cmd = my_raw_cmd;
3300 cont = &raw_cmd_cont;
3301 ret = wait_til_done(floppy_start, 1);
3303 if (DP->flags & FD_DEBUG) {
3304 DPRINT("calling disk change from raw_cmd ioctl\n");
3308 if (ret != -EINTR && FDCS->reset)
3311 DRS->track = NO_TRACK;
3313 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3316 raw_cmd_free(&my_raw_cmd);
3320 static int invalidate_drive(struct block_device *bdev)
3322 /* invalidate the buffer track to force a reread */
3323 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3324 process_fd_request();
3325 check_disk_change(bdev);
3329 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
3330 int drive, int type, struct block_device *bdev)
3334 /* sanity checking for parameters. */
3337 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3338 /* check if reserved bits are set */
3339 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_ZEROBASED)) != 0)
3342 if (!capable(CAP_SYS_ADMIN))
3344 mutex_lock(&open_lock);
3346 floppy_type[type] = *g;
3347 floppy_type[type].name = "user format";
3348 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3349 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3350 floppy_type[type].size + 1;
3351 process_fd_request();
3352 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3353 struct block_device *bdev = opened_bdev[cnt];
3354 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3356 __invalidate_device(bdev);
3358 mutex_unlock(&open_lock);
3362 if (cmd != FDDEFPRM)
3363 /* notice a disk change immediately, else
3364 * we lose our settings immediately*/
3365 CALL(poll_drive(1, FD_RAW_NEED_DISK));
3366 oldStretch = g->stretch;
3367 user_params[drive] = *g;
3368 if (buffer_drive == drive)
3369 SUPBOUND(buffer_max, user_params[drive].sect);
3370 current_type[drive] = &user_params[drive];
3371 floppy_sizes[drive] = user_params[drive].size;
3372 if (cmd == FDDEFPRM)
3373 DRS->keep_data = -1;
3376 /* invalidation. Invalidate only when needed, i.e.
3377 * when there are already sectors in the buffer cache
3378 * whose number will change. This is useful, because
3379 * mtools often changes the geometry of the disk after
3380 * looking at the boot block */
3381 if (DRS->maxblock > user_params[drive].sect ||
3383 ((user_params[drive].sect ^ oldStretch) &
3384 (FD_SWAPSIDES | FD_ZEROBASED)))
3385 invalidate_drive(bdev);
3387 process_fd_request();
3392 /* handle obsolete ioctl's */
3393 static int ioctl_table[] = {
3421 static inline int normalize_ioctl(int *cmd, int *size)
3425 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3426 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3427 *size = _IOC_SIZE(*cmd);
3428 *cmd = ioctl_table[i];
3429 if (*size > _IOC_SIZE(*cmd)) {
3430 printk("ioctl not yet supported\n");
3439 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3442 *g = &floppy_type[type];
3445 CALL(poll_drive(0, 0));
3446 process_fd_request();
3447 *g = current_type[drive];
3454 static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3456 int drive = (long)bdev->bd_disk->private_data;
3457 int type = ITYPE(drive_state[drive].fd_device);
3458 struct floppy_struct *g;
3461 ret = get_floppy_geometry(drive, type, &g);
3465 geo->heads = g->head;
3466 geo->sectors = g->sect;
3467 geo->cylinders = g->track;
3471 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
3472 unsigned long param)
3474 #define FD_IOCTL_ALLOWED ((filp) && (filp)->private_data)
3475 #define OUT(c,x) case c: outparam = (const char *) (x); break
3476 #define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
3478 int drive = (long)inode->i_bdev->bd_disk->private_data;
3479 int type = ITYPE(UDRS->fd_device);
3484 struct floppy_struct g; /* geometry */
3485 struct format_descr f;
3486 struct floppy_max_errors max_errors;
3487 struct floppy_drive_params dp;
3488 } inparam; /* parameters coming from user space */
3489 const char *outparam; /* parameters passed back to user space */
3491 /* convert compatibility eject ioctls into floppy eject ioctl.
3492 * We do this in order to provide a means to eject floppy disks before
3493 * installing the new fdutils package */
3494 if (cmd == CDROMEJECT || /* CD-ROM eject */
3495 cmd == 0x6470 /* SunOS floppy eject */ ) {
3496 DPRINT("obsolete eject ioctl\n");
3497 DPRINT("please use floppycontrol --eject\n");
3501 /* convert the old style command into a new style command */
3502 if ((cmd & 0xff00) == 0x0200) {
3503 ECALL(normalize_ioctl(&cmd, &size));
3507 /* permission checks */
3508 if (((cmd & 0x40) && !FD_IOCTL_ALLOWED) ||
3509 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3513 CLEARSTRUCT(&inparam);
3514 if (_IOC_DIR(cmd) & _IOC_WRITE)
3515 ECALL(fd_copyin((void __user *)param, &inparam, size))
3519 if (UDRS->fd_ref != 1)
3520 /* somebody else has this drive open */
3524 /* do the actual eject. Fails on
3525 * non-Sparc architectures */
3526 ret = fd_eject(UNIT(drive));
3528 USETF(FD_DISK_CHANGED);
3530 process_fd_request();
3534 current_type[drive] = NULL;
3535 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3536 UDRS->keep_data = 0;
3537 return invalidate_drive(inode->i_bdev);
3540 return set_geometry(cmd, &inparam.g,
3541 drive, type, inode->i_bdev);
3543 ECALL(get_floppy_geometry(drive, type,
3544 (struct floppy_struct **)
3549 UDP->flags |= FTD_MSG;
3552 UDP->flags &= ~FTD_MSG;
3557 CALL(poll_drive(1, FD_RAW_NEED_DISK));
3559 process_fd_request();
3560 if (ret & FD_VERIFY)
3562 if (!(ret & FD_DISK_WRITABLE))
3566 if (UDRS->fd_ref != 1)
3568 return do_format(drive, &inparam.f);
3572 return invalidate_drive(inode->i_bdev);
3574 case FDSETEMSGTRESH:
3575 UDP->max_errors.reporting =
3576 (unsigned short)(param & 0x0f);
3578 OUT(FDGETMAXERRS, &UDP->max_errors);
3579 IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
3582 outparam = drive_name(type, drive);
3583 SUPBOUND(size, strlen(outparam) + 1);
3586 IN(FDSETDRVPRM, UDP, dp);
3587 OUT(FDGETDRVPRM, UDP);
3591 CALL(poll_drive(1, FD_RAW_NEED_DISK));
3592 process_fd_request();
3594 OUT(FDGETDRVSTAT, UDRS);
3597 return user_reset_fdc(drive, (int)param, 1);
3599 OUT(FDGETFDCSTAT, UFDCS);
3604 OUT(FDWERRORGET, UDRWE);
3611 CALL(i = raw_cmd_ioctl(cmd, (void __user *)param));
3612 process_fd_request();
3618 process_fd_request();
3625 if (_IOC_DIR(cmd) & _IOC_READ)
3626 return fd_copyout((void __user *)param, outparam, size);
3633 static void __init config_types(void)
3638 /* read drive info out of physical CMOS */
3641 UDP->cmos = FLOPPY0_TYPE;
3643 if (!UDP->cmos && FLOPPY1_TYPE)
3644 UDP->cmos = FLOPPY1_TYPE;
3646 /* FIXME: additional physical CMOS drive detection should go here */
3648 for (drive = 0; drive < N_DRIVE; drive++) {
3649 unsigned int type = UDP->cmos;
3650 struct floppy_drive_params *params;
3651 const char *name = NULL;
3652 static char temparea[32];
3654 if (type < ARRAY_SIZE(default_drive_params)) {
3655 params = &default_drive_params[type].params;
3657 name = default_drive_params[type].name;
3658 allowed_drive_mask |= 1 << drive;
3660 allowed_drive_mask &= ~(1 << drive);
3662 params = &default_drive_params[0].params;
3663 sprintf(temparea, "unknown type %d (usb?)", type);
3667 const char *prepend = ",";
3669 prepend = KERN_INFO "Floppy drive(s):";
3672 printk("%s fd%d is %s", prepend, drive, name);
3680 static int floppy_release(struct inode *inode, struct file *filp)
3682 int drive = (long)inode->i_bdev->bd_disk->private_data;
3684 mutex_lock(&open_lock);
3685 if (UDRS->fd_ref < 0)
3687 else if (!UDRS->fd_ref--) {
3688 DPRINT("floppy_release with fd_ref == 0");
3692 opened_bdev[drive] = NULL;
3693 mutex_unlock(&open_lock);
3699 * floppy_open check for aliasing (/dev/fd0 can be the same as
3700 * /dev/PS0 etc), and disallows simultaneous access to the same
3701 * drive with different device numbers.
3703 static int floppy_open(struct inode *inode, struct file *filp)
3705 int drive = (long)inode->i_bdev->bd_disk->private_data;
3711 filp->private_data = (void *)0;
3712 mutex_lock(&open_lock);
3713 old_dev = UDRS->fd_device;
3714 if (opened_bdev[drive] && opened_bdev[drive] != inode->i_bdev)
3717 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3718 USETF(FD_DISK_CHANGED);
3722 if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3725 if (filp->f_flags & O_EXCL)
3730 opened_bdev[drive] = inode->i_bdev;
3734 if (!floppy_track_buffer) {
3735 /* if opening an ED drive, reserve a big buffer,
3736 * else reserve a small one */
3737 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3738 try = 64; /* Only 48 actually useful */
3740 try = 32; /* Only 24 actually useful */
3742 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3743 if (!tmp && !floppy_track_buffer) {
3744 try >>= 1; /* buffer only one side */
3746 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3748 if (!tmp && !floppy_track_buffer) {
3749 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 UDRS->fd_device = iminor(inode);
3766 set_capacity(disks[drive], floppy_sizes[iminor(inode)]);
3767 if (old_dev != -1 && old_dev != iminor(inode)) {
3768 if (buffer_drive == drive)
3772 /* Allow ioctls if we have write-permissions even if read-only open.
3773 * Needed so that programs such as fdrawcmd still can work on write
3774 * protected disks */
3775 if ((filp->f_mode & FMODE_WRITE) || !file_permission(filp, MAY_WRITE))
3776 filp->private_data = (void *)8;
3778 if (UFDCS->rawcmd == 1)
3781 if (!(filp->f_flags & O_NDELAY)) {
3782 if (filp->f_mode & 3) {
3783 UDRS->last_checked = 0;
3784 check_disk_change(inode->i_bdev);
3785 if (UTESTF(FD_DISK_CHANGED))
3789 if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3792 mutex_unlock(&open_lock);
3795 if (UDRS->fd_ref < 0)
3800 opened_bdev[drive] = NULL;
3802 mutex_unlock(&open_lock);
3807 * Check if the disk has been changed or if a change has been faked.
3809 static int check_floppy_change(struct gendisk *disk)
3811 int drive = (long)disk->private_data;
3813 if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3816 if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
3819 process_fd_request();
3822 if (UTESTF(FD_DISK_CHANGED) ||
3823 UTESTF(FD_VERIFY) ||
3824 test_bit(drive, &fake_change) ||
3825 (!ITYPE(UDRS->fd_device) && !current_type[drive]))
3831 * This implements "read block 0" for floppy_revalidate().
3832 * Needed for format autodetection, checking whether there is
3833 * a disk in the drive, and whether that disk is writable.
3836 static void floppy_rb0_complete(struct bio *bio,
3839 complete((struct completion *)bio->bi_private);
3842 static int __floppy_read_block_0(struct block_device *bdev)
3845 struct bio_vec bio_vec;
3846 struct completion complete;
3850 page = alloc_page(GFP_NOIO);
3852 process_fd_request();
3856 size = bdev->bd_block_size;
3861 bio.bi_io_vec = &bio_vec;
3862 bio_vec.bv_page = page;
3863 bio_vec.bv_len = size;
3864 bio_vec.bv_offset = 0;
3870 init_completion(&complete);
3871 bio.bi_private = &complete;
3872 bio.bi_end_io = floppy_rb0_complete;
3874 submit_bio(READ, &bio);
3875 generic_unplug_device(bdev_get_queue(bdev));
3876 process_fd_request();
3877 wait_for_completion(&complete);
3884 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3885 * the bootblock (block 0). "Autodetection" is also needed to check whether
3886 * there is a disk in the drive at all... Thus we also do it for fixed
3887 * geometry formats */
3888 static int floppy_revalidate(struct gendisk *disk)
3890 int drive = (long)disk->private_data;
3891 #define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
3895 if (UTESTF(FD_DISK_CHANGED) ||
3896 UTESTF(FD_VERIFY) || test_bit(drive, &fake_change) || NO_GEOM) {
3897 if (usage_count == 0) {
3898 printk("VFS: revalidate called on non-open device.\n");
3902 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3903 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
3904 process_fd_request(); /*already done by another thread */
3909 if (buffer_drive == drive)
3911 clear_bit(drive, &fake_change);
3912 UCLEARF(FD_DISK_CHANGED);
3917 res = __floppy_read_block_0(opened_bdev[drive]);
3920 poll_drive(0, FD_RAW_NEED_DISK);
3921 process_fd_request();
3924 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3928 static struct block_device_operations floppy_fops = {
3929 .owner = THIS_MODULE,
3930 .open = floppy_open,
3931 .release = floppy_release,
3933 .getgeo = fd_getgeo,
3934 .media_changed = check_floppy_change,
3935 .revalidate_disk = floppy_revalidate,
3939 * Floppy Driver initialization
3940 * =============================
3943 /* Determine the floppy disk controller type */
3944 /* This routine was written by David C. Niemi */
3945 static char __init get_fdc_version(void)
3949 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
3952 if ((r = result()) <= 0x00)
3953 return FDC_NONE; /* No FDC present ??? */
3954 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3955 printk(KERN_INFO "FDC %d is an 8272A\n", fdc);
3956 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
3960 ("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3965 if (!fdc_configure()) {
3966 printk(KERN_INFO "FDC %d is an 82072\n", fdc);
3967 return FDC_82072; /* 82072 doesn't know CONFIGURE */
3970 output_byte(FD_PERPENDICULAR);
3971 if (need_more_output() == MORE_OUTPUT) {
3974 printk(KERN_INFO "FDC %d is an 82072A\n", fdc);
3975 return FDC_82072A; /* 82072A as found on Sparcs. */
3978 output_byte(FD_UNLOCK);
3980 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3981 printk(KERN_INFO "FDC %d is a pre-1991 82077\n", fdc);
3982 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
3985 if ((r != 1) || (reply_buffer[0] != 0x00)) {
3986 printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3990 output_byte(FD_PARTID);
3993 printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3997 if (reply_buffer[0] == 0x80) {
3998 printk(KERN_INFO "FDC %d is a post-1991 82077\n", fdc);
3999 return FDC_82077; /* Revised 82077AA passes all the tests */
4001 switch (reply_buffer[0] >> 5) {
4003 /* Either a 82078-1 or a 82078SL running at 5Volt */
4004 printk(KERN_INFO "FDC %d is an 82078.\n", fdc);
4007 printk(KERN_INFO "FDC %d is a 44pin 82078\n", fdc);
4010 printk(KERN_INFO "FDC %d is a S82078B\n", fdc);
4013 printk(KERN_INFO "FDC %d is a National Semiconductor PC87306\n",
4018 "FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4019 fdc, reply_buffer[0] >> 5);
4020 return FDC_82078_UNKN;
4022 } /* get_fdc_version */
4024 /* lilo configuration */
4026 static void __init floppy_set_flags(int *ints, int param, int param2)
4030 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4032 default_drive_params[i].params.flags |= param2;
4034 default_drive_params[i].params.flags &= ~param2;
4036 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4039 static void __init daring(int *ints, int param, int param2)
4043 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4045 default_drive_params[i].params.select_delay = 0;
4046 default_drive_params[i].params.flags |=
4047 FD_SILENT_DCL_CLEAR;
4049 default_drive_params[i].params.select_delay =
4051 default_drive_params[i].params.flags &=
4052 ~FD_SILENT_DCL_CLEAR;
4055 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4058 static void __init set_cmos(int *ints, int dummy, int dummy2)
4060 int current_drive = 0;
4063 DPRINT("wrong number of parameters for CMOS\n");
4066 current_drive = ints[1];
4067 if (current_drive < 0 || current_drive >= 8) {
4068 DPRINT("bad drive for set_cmos\n");
4072 if (current_drive >= 4 && !FDC2)
4076 DPRINT("setting CMOS code to %d\n", ints[2]);
4079 static struct param_table {
4081 void (*fn) (int *ints, int param, int param2);
4085 } config_params[] __initdata = {
4086 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4087 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4088 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4089 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4090 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4091 {"daring", daring, NULL, 1, 0},
4093 {"two_fdc", NULL, &FDC2, 0x370, 0},
4094 {"one_fdc", NULL, &FDC2, 0, 0},
4096 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4097 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4098 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4099 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4100 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4101 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4102 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4103 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4104 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4105 {"nofifo", NULL, &no_fifo, 0x20, 0},
4106 {"usefifo", NULL, &no_fifo, 0, 0},
4107 {"cmos", set_cmos, NULL, 0, 0},
4108 {"slow", NULL, &slow_floppy, 1, 0},
4109 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4110 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4111 {"L40SX", NULL, &print_unex, 0, 0}
4116 static int __init floppy_setup(char *str)
4122 str = get_options(str, ARRAY_SIZE(ints), ints);
4124 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4125 if (strcmp(str, config_params[i].name) == 0) {
4129 param = config_params[i].def_param;
4130 if (config_params[i].fn)
4133 config_params[i].param2);
4134 if (config_params[i].var) {
4135 DPRINT("%s=%d\n", str, param);
4136 *config_params[i].var = param;
4143 DPRINT("unknown floppy option [%s]\n", str);
4145 DPRINT("allowed options are:");
4146 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4147 printk(" %s", config_params[i].name);
4150 DPRINT("botched floppy option\n");
4151 DPRINT("Read Documentation/floppy.txt\n");
4155 static int have_no_fdc = -ENODEV;
4157 static ssize_t floppy_cmos_show(struct device *dev,
4158 struct device_attribute *attr, char *buf)
4160 struct platform_device *p;
4163 p = container_of(dev, struct platform_device,dev);
4165 return sprintf(buf, "%X\n", UDP->cmos);
4167 DEVICE_ATTR(cmos,S_IRUGO,floppy_cmos_show,NULL);
4169 static void floppy_device_release(struct device *dev)
4171 complete(&device_release);
4174 static struct platform_device floppy_device[N_DRIVE];
4176 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4178 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4179 if (drive >= N_DRIVE ||
4180 !(allowed_drive_mask & (1 << drive)) ||
4181 fdc_state[FDC(drive)].version == FDC_NONE)
4183 if (((*part >> 2) & 0x1f) >= ARRAY_SIZE(floppy_type))
4186 return get_disk(disks[drive]);
4189 static int __init floppy_init(void)
4194 #if defined(CONFIG_PPC_MERGE)
4195 if (check_legacy_ioport(FDC1))
4201 for (dr = 0; dr < N_DRIVE; dr++) {
4202 disks[dr] = alloc_disk(1);
4208 disks[dr]->major = FLOPPY_MAJOR;
4209 disks[dr]->first_minor = TOMINOR(dr);
4210 disks[dr]->fops = &floppy_fops;
4211 sprintf(disks[dr]->disk_name, "fd%d", dr);
4213 init_timer(&motor_off_timer[dr]);
4214 motor_off_timer[dr].data = dr;
4215 motor_off_timer[dr].function = motor_off_callback;
4218 err = register_blkdev(FLOPPY_MAJOR, "fd");
4222 floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
4223 if (!floppy_queue) {
4225 goto out_unreg_blkdev;
4227 blk_queue_max_sectors(floppy_queue, 64);
4229 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4230 floppy_find, NULL, NULL);
4232 for (i = 0; i < 256; i++)
4234 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4236 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4238 reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
4241 for (i = 0; i < N_FDC; i++) {
4246 #if defined(__sparc__) || defined(__mc68000__)
4247 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4251 FDCS->version = FDC_82072A;
4255 use_virtual_dma = can_use_virtual_dma & 1;
4256 fdc_state[0].address = FDC1;
4257 if (fdc_state[0].address == -1) {
4258 del_timer(&fd_timeout);
4260 goto out_unreg_region;
4263 fdc_state[1].address = FDC2;
4266 fdc = 0; /* reset fdc in case of unexpected interrupt */
4267 err = floppy_grab_irq_and_dma();
4269 del_timer(&fd_timeout);
4271 goto out_unreg_region;
4274 /* initialise drive state */
4275 for (drive = 0; drive < N_DRIVE; drive++) {
4278 USETF(FD_DISK_NEWCHANGE);
4279 USETF(FD_DISK_CHANGED);
4281 UDRS->fd_device = -1;
4282 floppy_track_buffer = NULL;
4283 max_buffer_sectors = 0;
4286 * Small 10 msec delay to let through any interrupt that
4287 * initialization might have triggered, to not
4288 * confuse detection:
4292 for (i = 0; i < N_FDC; i++) {
4294 FDCS->driver_version = FD_DRIVER_VERSION;
4295 for (unit = 0; unit < 4; unit++)
4296 FDCS->track[unit] = 0;
4297 if (FDCS->address == -1)
4300 if (user_reset_fdc(-1, FD_RESET_ALWAYS, 0)) {
4301 /* free ioports reserved by floppy_grab_irq_and_dma() */
4302 release_region(FDCS->address + 2, 4);
4303 release_region(FDCS->address + 7, 1);
4305 FDCS->version = FDC_NONE;
4308 /* Try to determine the floppy controller type */
4309 FDCS->version = get_fdc_version();
4310 if (FDCS->version == FDC_NONE) {
4311 /* free ioports reserved by floppy_grab_irq_and_dma() */
4312 release_region(FDCS->address + 2, 4);
4313 release_region(FDCS->address + 7, 1);
4317 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4318 can_use_virtual_dma = 0;
4321 /* Not all FDCs seem to be able to handle the version command
4322 * properly, so force a reset for the standard FDC clones,
4323 * to avoid interrupt garbage.
4325 user_reset_fdc(-1, FD_RESET_ALWAYS, 0);
4328 del_timer(&fd_timeout);
4332 DPRINT("no floppy controllers found\n");
4334 goto out_flush_work;
4337 for (drive = 0; drive < N_DRIVE; drive++) {
4338 if (!(allowed_drive_mask & (1 << drive)))
4340 if (fdc_state[FDC(drive)].version == FDC_NONE)
4343 floppy_device[drive].name = floppy_device_name;
4344 floppy_device[drive].id = drive;
4345 floppy_device[drive].dev.release = floppy_device_release;
4347 err = platform_device_register(&floppy_device[drive]);
4349 goto out_flush_work;
4351 err = device_create_file(&floppy_device[drive].dev,&dev_attr_cmos);
4353 goto out_unreg_platform_dev;
4355 /* to be cleaned up... */
4356 disks[drive]->private_data = (void *)(long)drive;
4357 disks[drive]->queue = floppy_queue;
4358 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4359 disks[drive]->driverfs_dev = &floppy_device[drive].dev;
4360 add_disk(disks[drive]);
4365 out_unreg_platform_dev:
4366 platform_device_unregister(&floppy_device[drive]);
4368 flush_scheduled_work();
4370 floppy_release_irq_and_dma();
4372 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4373 blk_cleanup_queue(floppy_queue);
4375 unregister_blkdev(FLOPPY_MAJOR, "fd");
4378 del_timer(&motor_off_timer[dr]);
4379 put_disk(disks[dr]);
4384 static DEFINE_SPINLOCK(floppy_usage_lock);
4386 static int floppy_grab_irq_and_dma(void)
4388 unsigned long flags;
4390 spin_lock_irqsave(&floppy_usage_lock, flags);
4391 if (usage_count++) {
4392 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4395 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4398 * We might have scheduled a free_irq(), wait it to
4401 flush_scheduled_work();
4403 if (fd_request_irq()) {
4404 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4406 spin_lock_irqsave(&floppy_usage_lock, flags);
4408 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4411 if (fd_request_dma()) {
4412 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4414 if (can_use_virtual_dma & 2)
4415 use_virtual_dma = can_use_virtual_dma = 1;
4416 if (!(can_use_virtual_dma & 1)) {
4418 spin_lock_irqsave(&floppy_usage_lock, flags);
4420 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4425 for (fdc = 0; fdc < N_FDC; fdc++) {
4426 if (FDCS->address != -1) {
4427 if (!request_region(FDCS->address + 2, 4, "floppy")) {
4428 DPRINT("Floppy io-port 0x%04lx in use\n",
4432 if (!request_region(FDCS->address + 7, 1, "floppy DIR")) {
4433 DPRINT("Floppy io-port 0x%04lx in use\n",
4437 /* address + 6 is reserved, and may be taken by IDE.
4438 * Unfortunately, Adaptec doesn't know this :-(, */
4441 for (fdc = 0; fdc < N_FDC; fdc++) {
4442 if (FDCS->address != -1) {
4444 fd_outb(FDCS->dor, FD_DOR);
4448 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4450 for (fdc = 0; fdc < N_FDC; fdc++)
4451 if (FDCS->address != -1)
4452 fd_outb(FDCS->dor, FD_DOR);
4454 * The driver will try and free resources and relies on us
4455 * to know if they were allocated or not.
4458 irqdma_allocated = 1;
4461 release_region(FDCS->address + 2, 4);
4465 while (--fdc >= 0) {
4466 release_region(FDCS->address + 2, 4);
4467 release_region(FDCS->address + 7, 1);
4469 spin_lock_irqsave(&floppy_usage_lock, flags);
4471 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4475 static void floppy_release_irq_and_dma(void)
4478 #ifdef FLOPPY_SANITY_CHECK
4484 unsigned long tmpaddr;
4485 unsigned long flags;
4487 spin_lock_irqsave(&floppy_usage_lock, flags);
4488 if (--usage_count) {
4489 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4492 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4493 if (irqdma_allocated) {
4497 irqdma_allocated = 0;
4503 floppy_enable_hlt();
4505 if (floppy_track_buffer && max_buffer_sectors) {
4506 tmpsize = max_buffer_sectors * 1024;
4507 tmpaddr = (unsigned long)floppy_track_buffer;
4508 floppy_track_buffer = NULL;
4509 max_buffer_sectors = 0;
4510 buffer_min = buffer_max = -1;
4511 fd_dma_mem_free(tmpaddr, tmpsize);
4513 #ifdef FLOPPY_SANITY_CHECK
4515 for (drive = 0; drive < N_FDC * 4; drive++)
4516 if (timer_pending(motor_off_timer + drive))
4517 printk("motor off timer %d still active\n", drive);
4520 if (timer_pending(&fd_timeout))
4521 printk("floppy timer still active:%s\n", timeout_message);
4522 if (timer_pending(&fd_timer))
4523 printk("auxiliary floppy timer still active\n");
4524 if (work_pending(&floppy_work))
4525 printk("work still pending\n");
4528 for (fdc = 0; fdc < N_FDC; fdc++)
4529 if (FDCS->address != -1) {
4530 release_region(FDCS->address + 2, 4);
4531 release_region(FDCS->address + 7, 1);
4538 static char *floppy;
4540 static void __init parse_floppy_cfg_string(char *cfg)
4545 for (ptr = cfg; *cfg && *cfg != ' ' && *cfg != '\t'; cfg++) ;
4555 int __init init_module(void)
4558 parse_floppy_cfg_string(floppy);
4559 return floppy_init();
4562 void cleanup_module(void)
4566 init_completion(&device_release);
4567 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4568 unregister_blkdev(FLOPPY_MAJOR, "fd");
4570 for (drive = 0; drive < N_DRIVE; drive++) {
4571 del_timer_sync(&motor_off_timer[drive]);
4573 if ((allowed_drive_mask & (1 << drive)) &&
4574 fdc_state[FDC(drive)].version != FDC_NONE) {
4575 del_gendisk(disks[drive]);
4576 device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
4577 platform_device_unregister(&floppy_device[drive]);
4579 put_disk(disks[drive]);
4582 del_timer_sync(&fd_timeout);
4583 del_timer_sync(&fd_timer);
4584 blk_cleanup_queue(floppy_queue);
4587 floppy_release_irq_and_dma();
4589 /* eject disk, if any */
4592 wait_for_completion(&device_release);
4595 module_param(floppy, charp, 0);
4596 module_param(FLOPPY_IRQ, int, 0);
4597 module_param(FLOPPY_DMA, int, 0);
4598 MODULE_AUTHOR("Alain L. Knaff");
4599 MODULE_SUPPORTED_DEVICE("fd");
4600 MODULE_LICENSE("GPL");
4604 __setup("floppy=", floppy_setup);
4605 module_init(floppy_init)
4608 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);