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
9 * 02.12.91 - Changed to static variables to indicate need for reset
10 * and recalibrate. This makes some things easier (output_byte reset
11 * checking etc), and means less interrupt jumping in case of errors,
12 * so the code is hopefully easier to understand.
16 * This file is certainly a mess. I've tried my best to get it working,
17 * but I don't like programming floppies, and I have only one anyway.
18 * Urgel. I should check for more errors, and do more graceful error
19 * recovery. Seems there are problems with several drives. I've tried to
20 * correct them. No promises.
24 * As with hd.c, all routines within this file can (and will) be called
25 * by interrupts, so extreme caution is needed. A hardware interrupt
26 * handler may not sleep, or a kernel panic will happen. Thus I cannot
27 * call "floppy-on" directly, but have to set a special timer interrupt
32 * 28.02.92 - made track-buffering routines, based on the routines written
33 * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
37 * Automatic floppy-detection and formatting written by Werner Almesberger
38 * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
39 * the floppy-change signal detection.
43 * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
44 * FDC data overrun bug, added some preliminary stuff for vertical
47 * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
49 * TODO: Errors are still not counted properly.
53 * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
54 * modeled after the freeware MS-DOS program fdformat/88 V1.8 by
55 * Christoph H. Hochst\"atter.
56 * I have fixed the shift values to the ones I always use. Maybe a new
57 * ioctl() should be created to be able to modify them.
58 * There is a bug in the driver that makes it impossible to format a
59 * floppy as the first thing after bootup.
63 * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
64 * this helped the floppy driver as well. Much cleaner, and still seems to
68 /* 1994/6/24 --bbroad-- added the floppy table entries and made
69 * minor modifications to allow 2.88 floppies to be run.
72 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
77 * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
78 * format bug fixes, but unfortunately some new bugs too...
81 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
82 * errors to allow safe writing by specialized programs.
85 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
86 * by defining bit 1 of the "stretch" parameter to mean put sectors on the
87 * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
88 * drives are "upside-down").
92 * 1995/8/26 -- Andreas Busse -- added Mips support.
96 * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
97 * features to asm/floppy.h.
101 * 1998/05/07 -- Russell King -- More portability cleanups; moved definition of
102 * interrupt and dma channel to asm/floppy.h. Cleaned up some formatting &
103 * use of '0' for NULL.
107 * 1998/06/07 -- Alan Cox -- Merged the 2.0.34 fixes for resource allocation
112 * 1998/09/20 -- David Weinehall -- Added slow-down code for buggy PS/2-drives.
116 * 1999/08/13 -- Paul Slootman -- floppy stopped working on Alpha after 24
117 * days, 6 hours, 32 minutes and 32 seconds (i.e. MAXINT jiffies; ints were
118 * being used to store jiffies, which are unsigned longs).
122 * 2000/08/28 -- Arnaldo Carvalho de Melo <acme@conectiva.com.br>
123 * - get rid of check_region
128 * 2001/08/26 -- Paul Gortmaker - fix insmod oops on machines with no
129 * floppy controller (lingering task on list after module is gone... boom.)
133 * 2002/02/07 -- Anton Altaparmakov - Fix io ports reservation to correct range
134 * (0x3f2-0x3f5, 0x3f7). This fix is a bit of a hack but the proper fix
135 * requires many non-obvious changes in arch dependent code.
138 /* 2003/07/28 -- Daniele Bellucci <bellucda@tiscali.it>.
139 * Better audit of register_blkdev.
142 #define FLOPPY_SANITY_CHECK
143 #undef FLOPPY_SILENT_DCL_CLEAR
145 #define REALLY_SLOW_IO
148 #define DCL_DEBUG /* debug disk change line */
150 /* do print messages for unexpected interrupts */
151 static int print_unex = 1;
152 #include <linux/module.h>
153 #include <linux/sched.h>
154 #include <linux/fs.h>
155 #include <linux/kernel.h>
156 #include <linux/timer.h>
157 #include <linux/workqueue.h>
158 #include <linux/version.h>
160 #include <linux/fdreg.h>
163 * 1998/1/21 -- Richard Gooch <rgooch@atnf.csiro.au> -- devfs support
166 #include <linux/fd.h>
167 #include <linux/hdreg.h>
169 #include <linux/errno.h>
170 #include <linux/slab.h>
171 #include <linux/mm.h>
172 #include <linux/bio.h>
173 #include <linux/string.h>
174 #include <linux/fcntl.h>
175 #include <linux/delay.h>
176 #include <linux/mc146818rtc.h> /* CMOS defines */
177 #include <linux/ioport.h>
178 #include <linux/interrupt.h>
179 #include <linux/init.h>
180 #include <linux/devfs_fs_kernel.h>
181 #include <linux/device.h>
182 #include <linux/buffer_head.h> /* for invalidate_buffers() */
185 * PS/2 floppies have much slower step rates than regular floppies.
186 * It's been recommended that take about 1/4 of the default speed
187 * in some more extreme cases.
189 static int slow_floppy;
193 #include <asm/system.h>
195 #include <asm/uaccess.h>
197 static int FLOPPY_IRQ = 6;
198 static int FLOPPY_DMA = 2;
199 static int can_use_virtual_dma = 2;
201 * can use virtual DMA:
202 * 0 = use of virtual DMA disallowed by config
203 * 1 = use of virtual DMA prescribed by config
204 * 2 = no virtual DMA preference configured. By default try hard DMA,
205 * but fall back on virtual DMA when not enough memory available
208 static int use_virtual_dma;
212 * 1 using virtual DMA
213 * This variable is set to virtual when a DMA mem problem arises, and
214 * reset back in floppy_grab_irq_and_dma.
215 * It is not safe to reset it in other circumstances, because the floppy
216 * driver may have several buffers in use at once, and we do currently not
217 * record each buffers capabilities
220 static spinlock_t floppy_lock = SPIN_LOCK_UNLOCKED;
221 static struct completion device_release;
223 static unsigned short virtual_dma_port = 0x3f0;
224 irqreturn_t floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs);
225 static int set_dor(int fdc, char mask, char data);
226 static void register_devfs_entries(int drive) __init;
228 #define K_64 0x10000 /* 64KB */
230 /* the following is the mask of allowed drives. By default units 2 and
231 * 3 of both floppy controllers are disabled, because switching on the
232 * motor of these drives causes system hangs on some PCI computers. drive
233 * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
234 * a drive is allowed.
236 * NOTE: This must come before we include the arch floppy header because
237 * some ports reference this variable from there. -DaveM
240 static int allowed_drive_mask = 0x33;
242 #include <asm/floppy.h>
244 static int irqdma_allocated;
246 #define LOCAL_END_REQUEST
247 #define DEVICE_NAME "floppy"
249 #include <linux/blkdev.h>
250 #include <linux/blkpg.h>
251 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
252 #include <linux/completion.h>
254 static struct request *current_req;
255 static struct request_queue *floppy_queue;
256 static void do_fd_request(request_queue_t * q);
258 #ifndef fd_get_dma_residue
259 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
262 /* Dma Memory related stuff */
264 #ifndef fd_dma_mem_free
265 #define fd_dma_mem_free(addr, size) free_pages(addr, get_order(size))
268 #ifndef fd_dma_mem_alloc
269 #define fd_dma_mem_alloc(size) __get_dma_pages(GFP_KERNEL,get_order(size))
272 static inline void fallback_on_nodma_alloc(char **addr, size_t l)
274 #ifdef FLOPPY_CAN_FALLBACK_ON_NODMA
276 return; /* we have the memory */
277 if (can_use_virtual_dma != 2)
278 return; /* no fallback allowed */
280 ("DMA memory shortage. Temporarily falling back on virtual DMA\n");
281 *addr = (char *)nodma_mem_alloc(l);
287 /* End dma memory related stuff */
289 static unsigned long fake_change;
290 static int initialising = 1;
292 #define ITYPE(x) (((x)>>2) & 0x1f)
293 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
294 #define UNIT(x) ((x) & 0x03) /* drive on fdc */
295 #define FDC(x) (((x) & 0x04) >> 2) /* fdc of drive */
296 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
297 /* reverse mapping from unit and fdc to drive */
298 #define DP (&drive_params[current_drive])
299 #define DRS (&drive_state[current_drive])
300 #define DRWE (&write_errors[current_drive])
301 #define FDCS (&fdc_state[fdc])
302 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
303 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
304 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
306 #define UDP (&drive_params[drive])
307 #define UDRS (&drive_state[drive])
308 #define UDRWE (&write_errors[drive])
309 #define UFDCS (&fdc_state[FDC(drive)])
310 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
311 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
312 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
314 #define DPRINT(format, args...) printk(DEVICE_NAME "%d: " format, current_drive , ## args)
316 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
317 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
319 #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
322 #define COMMAND raw_cmd->cmd[0]
323 #define DR_SELECT raw_cmd->cmd[1]
324 #define TRACK raw_cmd->cmd[2]
325 #define HEAD raw_cmd->cmd[3]
326 #define SECTOR raw_cmd->cmd[4]
327 #define SIZECODE raw_cmd->cmd[5]
328 #define SECT_PER_TRACK raw_cmd->cmd[6]
329 #define GAP raw_cmd->cmd[7]
330 #define SIZECODE2 raw_cmd->cmd[8]
334 #define F_SIZECODE raw_cmd->cmd[2]
335 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
336 #define F_GAP raw_cmd->cmd[4]
337 #define F_FILL raw_cmd->cmd[5]
341 * Maximum disk size (in kilobytes). This default is used whenever the
342 * current disk size is unknown.
343 * [Now it is rather a minimum]
345 #define MAX_DISK_SIZE 4 /* 3984 */
348 * globals used by 'result()'
350 #define MAX_REPLIES 16
351 static unsigned char reply_buffer[MAX_REPLIES];
352 static int inr; /* size of reply buffer, when called from interrupt */
353 #define ST0 (reply_buffer[0])
354 #define ST1 (reply_buffer[1])
355 #define ST2 (reply_buffer[2])
356 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
357 #define R_TRACK (reply_buffer[3])
358 #define R_HEAD (reply_buffer[4])
359 #define R_SECTOR (reply_buffer[5])
360 #define R_SIZECODE (reply_buffer[6])
362 #define SEL_DLY (2*HZ/100)
365 * this struct defines the different floppy drive types.
368 struct floppy_drive_params params;
369 const char *name; /* name printed while booting */
370 } default_drive_params[] = {
371 /* NOTE: the time values in jiffies should be in msec!
373 | Maximum data rate supported by drive type
374 | | Head load time, msec
375 | | | Head unload time, msec (not used)
376 | | | | Step rate interval, usec
377 | | | | | Time needed for spinup time (jiffies)
378 | | | | | | Timeout for spinning down (jiffies)
379 | | | | | | | Spindown offset (where disk stops)
380 | | | | | | | | Select delay
381 | | | | | | | | | RPS
382 | | | | | | | | | | Max number of tracks
383 | | | | | | | | | | | Interrupt timeout
384 | | | | | | | | | | | | Max nonintlv. sectors
385 | | | | | | | | | | | | | -Max Errors- flags */
386 {{0, 500, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 80, 3*HZ, 20, {3,1,2,0,2}, 0,
387 0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
389 {{1, 300, 16, 16, 8000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 40, 3*HZ, 17, {3,1,2,0,2}, 0,
390 0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
392 {{2, 500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6, 83, 3*HZ, 17, {3,1,2,0,2}, 0,
393 0, { 2, 5, 6,23,10,20,12, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
395 {{3, 250, 16, 16, 3000, 1*HZ, 3*HZ, 0, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
396 0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
398 {{4, 500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 20, {3,1,2,0,2}, 0,
399 0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
401 {{5, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
402 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
404 {{6, 1000, 15, 8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5, 83, 3*HZ, 40, {3,1,2,0,2}, 0,
405 0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
406 /* | --autodetected formats--- | | |
407 * read_track | | Name printed when booting
409 * Frequency of disk change checks */
412 static struct floppy_drive_params drive_params[N_DRIVE];
413 static struct floppy_drive_struct drive_state[N_DRIVE];
414 static struct floppy_write_errors write_errors[N_DRIVE];
415 static struct timer_list motor_off_timer[N_DRIVE];
416 static struct gendisk *disks[N_DRIVE];
417 static struct block_device *opened_bdev[N_DRIVE];
418 static DECLARE_MUTEX(open_lock);
419 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
422 * This struct defines the different floppy types.
424 * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
425 * types (e.g. 360kB diskette in 1.2MB drive, etc.). Bit 1 of 'stretch'
426 * tells if the disk is in Commodore 1581 format, which means side 0 sectors
427 * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
428 * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
429 * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
430 * side 0 is on physical side 0 (but with the misnamed sector IDs).
431 * 'stretch' should probably be renamed to something more general, like
432 * 'options'. Other parameters should be self-explanatory (see also
442 | | | | | | Data rate, | 0x40 for perp
443 | | | | | | | Spec1 (stepping rate, head unload
444 | | | | | | | | /fmt gap (gap2) */
445 static struct floppy_struct floppy_type[32] = {
446 { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* 0 no testing */
447 { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360" }, /* 1 360KB PC */
448 { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /* 2 1.2MB AT */
449 { 720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360" }, /* 3 360KB SS 3.5" */
450 { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720" }, /* 4 720KB 3.5" */
451 { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360" }, /* 5 360KB AT */
452 { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720" }, /* 6 720KB AT */
453 { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /* 7 1.44MB 3.5" */
454 { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /* 8 2.88MB 3.5" */
455 { 6240,39,2,80,0,0x1B,0x43,0xAF,0x28,"E3120" }, /* 9 3.12MB 3.5" */
457 { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25" */
458 { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5" */
459 { 820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410" }, /* 12 410KB 5.25" */
460 { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820" }, /* 13 820KB 3.5" */
461 { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25" */
462 { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5" */
463 { 840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420" }, /* 16 420KB 5.25" */
464 { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830" }, /* 17 830KB 3.5" */
465 { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25" */
466 { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5" */
468 { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880" }, /* 20 880KB 5.25" */
469 { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5" */
470 { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5" */
471 { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25" */
472 { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5" */
473 { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5" */
474 { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5" */
475 { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5" */
476 { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5" */
478 { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5" */
479 { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800" }, /* 30 800KB 3.5" */
480 { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5" */
483 #define NUMBER(x) (sizeof(x) / sizeof(*(x)))
484 #define SECTSIZE (_FD_SECTSIZE(*floppy))
486 /* Auto-detection: Disk type used until the next media change occurs. */
487 static struct floppy_struct *current_type[N_DRIVE];
490 * User-provided type information. current_type points to
491 * the respective entry of this array.
493 static struct floppy_struct user_params[N_DRIVE];
495 static sector_t floppy_sizes[256];
498 * The driver is trying to determine the correct media format
499 * while probing is set. rw_interrupt() clears it after a
504 /* Synchronization of FDC access. */
505 #define FD_COMMAND_NONE -1
506 #define FD_COMMAND_ERROR 2
507 #define FD_COMMAND_OKAY 3
509 static volatile int command_status = FD_COMMAND_NONE;
510 static unsigned long fdc_busy;
511 static DECLARE_WAIT_QUEUE_HEAD(fdc_wait);
512 static DECLARE_WAIT_QUEUE_HEAD(command_done);
514 #define NO_SIGNAL (!interruptible || !signal_pending(current))
515 #define CALL(x) if ((x) == -EINTR) return -EINTR
516 #define ECALL(x) if ((ret = (x))) return ret;
517 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
518 #define WAIT(x) _WAIT((x),interruptible)
519 #define IWAIT(x) _WAIT((x),1)
521 /* Errors during formatting are counted here. */
522 static int format_errors;
524 /* Format request descriptor. */
525 static struct format_descr format_req;
528 * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
529 * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
530 * H is head unload time (1=16ms, 2=32ms, etc)
535 * Because these are written to by the DMA controller, they must
536 * not contain a 64k byte boundary crossing, or data will be
539 static char *floppy_track_buffer;
540 static int max_buffer_sectors;
543 typedef void (*done_f) (int);
544 static struct cont_t {
545 void (*interrupt) (void); /* this is called after the interrupt of the
547 void (*redo) (void); /* this is called to retry the operation */
548 void (*error) (void); /* this is called to tally an error */
549 done_f done; /* this is called to say if the operation has
550 * succeeded/failed */
553 static void floppy_ready(void);
554 static void floppy_start(void);
555 static void process_fd_request(void);
556 static void recalibrate_floppy(void);
557 static void floppy_shutdown(unsigned long);
559 static int floppy_grab_irq_and_dma(void);
560 static void floppy_release_irq_and_dma(void);
563 * The "reset" variable should be tested whenever an interrupt is scheduled,
564 * after the commands have been sent. This is to ensure that the driver doesn't
565 * get wedged when the interrupt doesn't come because of a failed command.
566 * reset doesn't need to be tested before sending commands, because
567 * output_byte is automatically disabled when reset is set.
569 #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
570 static void reset_fdc(void);
573 * These are global variables, as that's the easiest way to give
574 * information to interrupts. They are the data used for the current
578 #define NEED_1_RECAL -2
579 #define NEED_2_RECAL -3
581 static int usage_count;
583 /* buffer related variables */
584 static int buffer_track = -1;
585 static int buffer_drive = -1;
586 static int buffer_min = -1;
587 static int buffer_max = -1;
589 /* fdc related variables, should end up in a struct */
590 static struct floppy_fdc_state fdc_state[N_FDC];
591 static int fdc; /* current fdc */
593 static struct floppy_struct *_floppy = floppy_type;
594 static unsigned char current_drive;
595 static long current_count_sectors;
596 static unsigned char fsector_t; /* sector in track */
597 static unsigned char in_sector_offset; /* offset within physical sector,
598 * expressed in units of 512 bytes */
601 static inline int fd_eject(int drive)
612 static long unsigned debugtimer;
614 static inline void set_debugt(void)
616 debugtimer = jiffies;
619 static inline void debugt(const char *message)
621 if (DP->flags & DEBUGT)
622 printk("%s dtime=%lu\n", message, jiffies - debugtimer);
625 static inline void set_debugt(void) { }
626 static inline void debugt(const char *message) { }
629 typedef void (*timeout_fn) (unsigned long);
630 static struct timer_list fd_timeout = TIMER_INITIALIZER(floppy_shutdown, 0, 0);
632 static const char *timeout_message;
634 #ifdef FLOPPY_SANITY_CHECK
635 static void is_alive(const char *message)
637 /* this routine checks whether the floppy driver is "alive" */
638 if (test_bit(0, &fdc_busy) && command_status < 2
639 && !timer_pending(&fd_timeout)) {
640 DPRINT("timeout handler died: %s\n", message);
645 static void (*do_floppy) (void) = NULL;
647 #ifdef FLOPPY_SANITY_CHECK
651 static void (*lasthandler) (void);
652 static unsigned long interruptjiffies;
653 static unsigned long resultjiffies;
654 static int resultsize;
655 static unsigned long lastredo;
657 static struct output_log {
659 unsigned char status;
660 unsigned long jiffies;
661 } output_log[OLOGSIZE];
663 static int output_log_pos;
666 #define current_reqD -1
667 #define MAXTIMEOUT -2
669 static void __reschedule_timeout(int drive, const char *message, int marg)
671 if (drive == current_reqD)
672 drive = current_drive;
673 del_timer(&fd_timeout);
674 if (drive < 0 || drive > N_DRIVE) {
675 fd_timeout.expires = jiffies + 20UL * HZ;
678 fd_timeout.expires = jiffies + UDP->timeout;
679 add_timer(&fd_timeout);
680 if (UDP->flags & FD_DEBUG) {
681 DPRINT("reschedule timeout ");
682 printk(message, marg);
685 timeout_message = message;
688 static void reschedule_timeout(int drive, const char *message, int marg)
692 spin_lock_irqsave(&floppy_lock, flags);
693 __reschedule_timeout(drive, message, marg);
694 spin_unlock_irqrestore(&floppy_lock, flags);
697 #define INFBOUND(a,b) (a)=max_t(int, a, b)
699 #define SUPBOUND(a,b) (a)=min_t(int, a, b)
702 * Bottom half floppy driver.
703 * ==========================
705 * This part of the file contains the code talking directly to the hardware,
706 * and also the main service loop (seek-configure-spinup-command)
711 * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
712 * and the last_checked date.
714 * last_checked is the date of the last check which showed 'no disk change'
715 * FD_DISK_CHANGE is set under two conditions:
716 * 1. The floppy has been changed after some i/o to that floppy already
718 * 2. No floppy disk is in the drive. This is done in order to ensure that
719 * requests are quickly flushed in case there is no disk in the drive. It
720 * follows that FD_DISK_CHANGE can only be cleared if there is a disk in
723 * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
724 * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
725 * each seek. If a disk is present, the disk change line should also be
726 * cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
727 * change line is set, this means either that no disk is in the drive, or
728 * that it has been removed since the last seek.
730 * This means that we really have a third possibility too:
731 * The floppy has been changed after the last seek.
734 static int disk_change(int drive)
736 int fdc = FDC(drive);
737 #ifdef FLOPPY_SANITY_CHECK
738 if (jiffies - UDRS->select_date < UDP->select_delay)
739 DPRINT("WARNING disk change called early\n");
740 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
741 (FDCS->dor & 3) != UNIT(drive) || fdc != FDC(drive)) {
742 DPRINT("probing disk change on unselected drive\n");
743 DPRINT("drive=%d fdc=%d dor=%x\n", drive, FDC(drive),
744 (unsigned int)FDCS->dor);
749 if (UDP->flags & FD_DEBUG) {
750 DPRINT("checking disk change line for drive %d\n", drive);
751 DPRINT("jiffies=%lu\n", jiffies);
752 DPRINT("disk change line=%x\n", fd_inb(FD_DIR) & 0x80);
753 DPRINT("flags=%lx\n", UDRS->flags);
756 if (UDP->flags & FD_BROKEN_DCL)
757 return UTESTF(FD_DISK_CHANGED);
758 if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80) {
759 USETF(FD_VERIFY); /* verify write protection */
760 if (UDRS->maxblock) {
761 /* mark it changed */
762 USETF(FD_DISK_CHANGED);
765 /* invalidate its geometry */
766 if (UDRS->keep_data >= 0) {
767 if ((UDP->flags & FTD_MSG) &&
768 current_type[drive] != NULL)
769 DPRINT("Disk type is undefined after "
771 current_type[drive] = NULL;
772 floppy_sizes[TOMINOR(drive)] = MAX_DISK_SIZE << 1;
775 /*USETF(FD_DISK_NEWCHANGE); */
778 UDRS->last_checked = jiffies;
779 UCLEARF(FD_DISK_NEWCHANGE);
784 static inline int is_selected(int dor, int unit)
786 return ((dor & (0x10 << unit)) && (dor & 3) == unit);
789 static int set_dor(int fdc, char mask, char data)
791 register unsigned char drive, unit, newdor, olddor;
793 if (FDCS->address == -1)
797 newdor = (olddor & mask) | data;
798 if (newdor != olddor) {
800 if (is_selected(olddor, unit) && !is_selected(newdor, unit)) {
801 drive = REVDRIVE(fdc, unit);
803 if (UDP->flags & FD_DEBUG) {
804 DPRINT("calling disk change from set_dor\n");
810 fd_outb(newdor, FD_DOR);
813 if (!is_selected(olddor, unit) && is_selected(newdor, unit)) {
814 drive = REVDRIVE(fdc, unit);
815 UDRS->select_date = jiffies;
819 * We should propagate failures to grab the resources back
820 * nicely from here. Actually we ought to rewrite the fd
821 * driver some day too.
823 if (newdor & FLOPPY_MOTOR_MASK)
824 floppy_grab_irq_and_dma();
825 if (olddor & FLOPPY_MOTOR_MASK)
826 floppy_release_irq_and_dma();
830 static void twaddle(void)
832 if (DP->select_delay)
834 fd_outb(FDCS->dor & ~(0x10 << UNIT(current_drive)), FD_DOR);
835 fd_outb(FDCS->dor, FD_DOR);
836 DRS->select_date = jiffies;
839 /* reset all driver information about the current fdc. This is needed after
840 * a reset, and after a raw command. */
841 static void reset_fdc_info(int mode)
845 FDCS->spec1 = FDCS->spec2 = -1;
846 FDCS->need_configure = 1;
849 for (drive = 0; drive < N_DRIVE; drive++)
850 if (FDC(drive) == fdc && (mode || UDRS->track != NEED_1_RECAL))
851 UDRS->track = NEED_2_RECAL;
854 /* selects the fdc and drive, and enables the fdc's input/dma. */
855 static void set_fdc(int drive)
857 if (drive >= 0 && drive < N_DRIVE) {
859 current_drive = drive;
861 if (fdc != 1 && fdc != 0) {
862 printk("bad fdc value\n");
867 set_dor(1 - fdc, ~8, 0);
869 if (FDCS->rawcmd == 2)
871 if (fd_inb(FD_STATUS) != STATUS_READY)
875 /* locks the driver */
876 static int _lock_fdc(int drive, int interruptible, int line)
880 "Trying to lock fdc while usage count=0 at line %d\n",
884 if (floppy_grab_irq_and_dma() == -1)
887 if (test_and_set_bit(0, &fdc_busy)) {
888 DECLARE_WAITQUEUE(wait, current);
889 add_wait_queue(&fdc_wait, &wait);
892 set_current_state(TASK_INTERRUPTIBLE);
894 if (!test_and_set_bit(0, &fdc_busy))
900 remove_wait_queue(&fdc_wait, &wait);
905 set_current_state(TASK_RUNNING);
906 remove_wait_queue(&fdc_wait, &wait);
908 command_status = FD_COMMAND_NONE;
910 __reschedule_timeout(drive, "lock fdc", 0);
915 #define lock_fdc(drive,interruptible) _lock_fdc(drive,interruptible, __LINE__)
917 #define LOCK_FDC(drive,interruptible) \
918 if (lock_fdc(drive,interruptible)) return -EINTR;
920 /* unlocks the driver */
921 static inline void unlock_fdc(void)
926 if (!test_bit(0, &fdc_busy))
927 DPRINT("FDC access conflict!\n");
930 DPRINT("device interrupt still active at FDC release: %p!\n",
932 command_status = FD_COMMAND_NONE;
933 spin_lock_irqsave(&floppy_lock, flags);
934 del_timer(&fd_timeout);
936 clear_bit(0, &fdc_busy);
937 if (elv_next_request(floppy_queue))
938 do_fd_request(floppy_queue);
939 spin_unlock_irqrestore(&floppy_lock, flags);
940 floppy_release_irq_and_dma();
944 /* switches the motor off after a given timeout */
945 static void motor_off_callback(unsigned long nr)
947 unsigned char mask = ~(0x10 << UNIT(nr));
949 set_dor(FDC(nr), mask, 0);
952 /* schedules motor off */
953 static void floppy_off(unsigned int drive)
955 unsigned long volatile delta;
956 register int fdc = FDC(drive);
958 if (!(FDCS->dor & (0x10 << UNIT(drive))))
961 del_timer(motor_off_timer + drive);
963 /* make spindle stop in a position which minimizes spinup time
966 delta = jiffies - UDRS->first_read_date + HZ -
967 UDP->spindown_offset;
968 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
969 motor_off_timer[drive].expires =
970 jiffies + UDP->spindown - delta;
972 add_timer(motor_off_timer + drive);
976 * cycle through all N_DRIVE floppy drives, for disk change testing.
977 * stopping at current drive. This is done before any long operation, to
978 * be sure to have up to date disk change information.
980 static void scandrives(void)
982 int i, drive, saved_drive;
984 if (DP->select_delay)
987 saved_drive = current_drive;
988 for (i = 0; i < N_DRIVE; i++) {
989 drive = (saved_drive + i + 1) % N_DRIVE;
990 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
991 continue; /* skip closed drives */
993 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
994 (0x10 << UNIT(drive))))
995 /* switch the motor off again, if it was off to
997 set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
999 set_fdc(saved_drive);
1002 static void empty(void)
1006 static DECLARE_WORK(floppy_work, NULL, NULL);
1008 static void schedule_bh(void (*handler) (void))
1010 PREPARE_WORK(&floppy_work, (void (*)(void *))handler, NULL);
1011 schedule_work(&floppy_work);
1014 static struct timer_list fd_timer = TIMER_INITIALIZER(NULL, 0, 0);
1016 static void cancel_activity(void)
1018 unsigned long flags;
1020 spin_lock_irqsave(&floppy_lock, flags);
1022 PREPARE_WORK(&floppy_work, (void *)empty, NULL);
1023 del_timer(&fd_timer);
1024 spin_unlock_irqrestore(&floppy_lock, flags);
1027 /* this function makes sure that the disk stays in the drive during the
1029 static void fd_watchdog(void)
1032 if (DP->flags & FD_DEBUG) {
1033 DPRINT("calling disk change from watchdog\n");
1037 if (disk_change(current_drive)) {
1038 DPRINT("disk removed during i/o\n");
1043 del_timer(&fd_timer);
1044 fd_timer.function = (timeout_fn) fd_watchdog;
1045 fd_timer.expires = jiffies + HZ / 10;
1046 add_timer(&fd_timer);
1050 static void main_command_interrupt(void)
1052 del_timer(&fd_timer);
1056 /* waits for a delay (spinup or select) to pass */
1057 static int fd_wait_for_completion(unsigned long delay, timeout_fn function)
1060 reset_fdc(); /* do the reset during sleep to win time
1061 * if we don't need to sleep, it's a good
1062 * occasion anyways */
1066 if ((signed)(jiffies - delay) < 0) {
1067 del_timer(&fd_timer);
1068 fd_timer.function = function;
1069 fd_timer.expires = delay;
1070 add_timer(&fd_timer);
1076 static spinlock_t floppy_hlt_lock = SPIN_LOCK_UNLOCKED;
1077 static int hlt_disabled;
1078 static void floppy_disable_hlt(void)
1080 unsigned long flags;
1082 spin_lock_irqsave(&floppy_hlt_lock, flags);
1083 if (!hlt_disabled) {
1085 #ifdef HAVE_DISABLE_HLT
1089 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1092 static void floppy_enable_hlt(void)
1094 unsigned long flags;
1096 spin_lock_irqsave(&floppy_hlt_lock, flags);
1099 #ifdef HAVE_DISABLE_HLT
1103 spin_unlock_irqrestore(&floppy_hlt_lock, flags);
1106 static void setup_DMA(void)
1110 #ifdef FLOPPY_SANITY_CHECK
1111 if (raw_cmd->length == 0) {
1114 printk("zero dma transfer size:");
1115 for (i = 0; i < raw_cmd->cmd_count; i++)
1116 printk("%x,", raw_cmd->cmd[i]);
1122 if (((unsigned long)raw_cmd->kernel_data) % 512) {
1123 printk("non aligned address: %p\n", raw_cmd->kernel_data);
1129 f = claim_dma_lock();
1132 if (fd_dma_setup(raw_cmd->kernel_data, raw_cmd->length,
1133 (raw_cmd->flags & FD_RAW_READ) ?
1134 DMA_MODE_READ : DMA_MODE_WRITE, FDCS->address) < 0) {
1135 release_dma_lock(f);
1140 release_dma_lock(f);
1143 fd_cacheflush(raw_cmd->kernel_data, raw_cmd->length);
1144 fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ) ?
1145 DMA_MODE_READ : DMA_MODE_WRITE);
1146 fd_set_dma_addr(raw_cmd->kernel_data);
1147 fd_set_dma_count(raw_cmd->length);
1148 virtual_dma_port = FDCS->address;
1150 release_dma_lock(f);
1152 floppy_disable_hlt();
1155 static void show_floppy(void);
1157 /* waits until the fdc becomes ready */
1158 static int wait_til_ready(void)
1160 int counter, status;
1163 for (counter = 0; counter < 10000; counter++) {
1164 status = fd_inb(FD_STATUS);
1165 if (status & STATUS_READY)
1168 if (!initialising) {
1169 DPRINT("Getstatus times out (%x) on fdc %d\n", status, fdc);
1176 /* sends a command byte to the fdc */
1177 static int output_byte(char byte)
1181 if ((status = wait_til_ready()) < 0)
1183 if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY) {
1184 fd_outb(byte, FD_DATA);
1185 #ifdef FLOPPY_SANITY_CHECK
1186 output_log[output_log_pos].data = byte;
1187 output_log[output_log_pos].status = status;
1188 output_log[output_log_pos].jiffies = jiffies;
1189 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1194 if (!initialising) {
1195 DPRINT("Unable to send byte %x to FDC. Fdc=%x Status=%x\n",
1202 #define LAST_OUT(x) if (output_byte(x)<0){ reset_fdc();return;}
1204 /* gets the response from the fdc */
1205 static int result(void)
1209 for (i = 0; i < MAX_REPLIES; i++) {
1210 if ((status = wait_til_ready()) < 0)
1212 status &= STATUS_DIR | STATUS_READY | STATUS_BUSY | STATUS_DMA;
1213 if ((status & ~STATUS_BUSY) == STATUS_READY) {
1214 #ifdef FLOPPY_SANITY_CHECK
1215 resultjiffies = jiffies;
1220 if (status == (STATUS_DIR | STATUS_READY | STATUS_BUSY))
1221 reply_buffer[i] = fd_inb(FD_DATA);
1225 if (!initialising) {
1227 ("get result error. Fdc=%d Last status=%x Read bytes=%d\n",
1235 #define MORE_OUTPUT -2
1236 /* does the fdc need more output? */
1237 static int need_more_output(void)
1240 if ((status = wait_til_ready()) < 0)
1242 if ((status & (STATUS_READY | STATUS_DIR | STATUS_DMA)) == STATUS_READY)
1247 /* Set perpendicular mode as required, based on data rate, if supported.
1248 * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1250 static inline void perpendicular_mode(void)
1252 unsigned char perp_mode;
1254 if (raw_cmd->rate & 0x40) {
1255 switch (raw_cmd->rate & 3) {
1263 DPRINT("Invalid data rate for perpendicular mode!\n");
1265 FDCS->reset = 1; /* convenient way to return to
1266 * redo without to much hassle (deep
1273 if (FDCS->perp_mode == perp_mode)
1275 if (FDCS->version >= FDC_82077_ORIG) {
1276 output_byte(FD_PERPENDICULAR);
1277 output_byte(perp_mode);
1278 FDCS->perp_mode = perp_mode;
1279 } else if (perp_mode) {
1280 DPRINT("perpendicular mode not supported by this FDC.\n");
1282 } /* perpendicular_mode */
1284 static int fifo_depth = 0xa;
1287 static int fdc_configure(void)
1290 output_byte(FD_CONFIGURE);
1291 if (need_more_output() != MORE_OUTPUT)
1294 output_byte(0x10 | (no_fifo & 0x20) | (fifo_depth & 0xf));
1295 output_byte(0); /* pre-compensation from track
1300 #define NOMINAL_DTR 500
1302 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1303 * head load time, and DMA disable flag to values needed by floppy.
1305 * The value "dtr" is the data transfer rate in Kbps. It is needed
1306 * to account for the data rate-based scaling done by the 82072 and 82077
1307 * FDC types. This parameter is ignored for other types of FDCs (i.e.
1310 * Note that changing the data transfer rate has a (probably deleterious)
1311 * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1312 * fdc_specify is called again after each data transfer rate
1315 * srt: 1000 to 16000 in microseconds
1316 * hut: 16 to 240 milliseconds
1317 * hlt: 2 to 254 milliseconds
1319 * These values are rounded up to the next highest available delay time.
1321 static void fdc_specify(void)
1323 unsigned char spec1, spec2;
1324 unsigned long srt, hlt, hut;
1325 unsigned long dtr = NOMINAL_DTR;
1326 unsigned long scale_dtr = NOMINAL_DTR;
1327 int hlt_max_code = 0x7f;
1328 int hut_max_code = 0xf;
1330 if (FDCS->need_configure && FDCS->version >= FDC_82072A) {
1332 FDCS->need_configure = 0;
1333 /*DPRINT("FIFO enabled\n"); */
1336 switch (raw_cmd->rate & 0x03) {
1342 if (FDCS->version >= FDC_82078) {
1343 /* chose the default rate table, not the one
1344 * where 1 = 2 Mbps */
1345 output_byte(FD_DRIVESPEC);
1346 if (need_more_output() == MORE_OUTPUT) {
1347 output_byte(UNIT(current_drive));
1357 if (FDCS->version >= FDC_82072) {
1359 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1360 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1363 /* Convert step rate from microseconds to milliseconds and 4 bits */
1364 srt = 16 - (DP->srt * scale_dtr / 1000 + NOMINAL_DTR - 1) / NOMINAL_DTR;
1371 hlt = (DP->hlt * scale_dtr / 2 + NOMINAL_DTR - 1) / NOMINAL_DTR;
1374 else if (hlt > 0x7f)
1377 hut = (DP->hut * scale_dtr / 16 + NOMINAL_DTR - 1) / NOMINAL_DTR;
1383 spec1 = (srt << 4) | hut;
1384 spec2 = (hlt << 1) | (use_virtual_dma & 1);
1386 /* If these parameters did not change, just return with success */
1387 if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1388 /* Go ahead and set spec1 and spec2 */
1389 output_byte(FD_SPECIFY);
1390 output_byte(FDCS->spec1 = spec1);
1391 output_byte(FDCS->spec2 = spec2);
1395 /* Set the FDC's data transfer rate on behalf of the specified drive.
1396 * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1397 * of the specify command (i.e. using the fdc_specify function).
1399 static int fdc_dtr(void)
1401 /* If data rate not already set to desired value, set it. */
1402 if ((raw_cmd->rate & 3) == FDCS->dtr)
1406 fd_outb(raw_cmd->rate & 3, FD_DCR);
1408 /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1409 * need a stabilization period of several milliseconds to be
1410 * enforced after data rate changes before R/W operations.
1411 * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1413 FDCS->dtr = raw_cmd->rate & 3;
1414 return (fd_wait_for_completion(jiffies + 2UL * HZ / 100,
1415 (timeout_fn) floppy_ready));
1418 static void tell_sector(void)
1420 printk(": track %d, head %d, sector %d, size %d",
1421 R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1425 * OK, this error interpreting routine is called after a
1426 * DMA read/write has succeeded
1427 * or failed, so we check the results, and copy any buffers.
1428 * hhb: Added better error reporting.
1429 * ak: Made this into a separate routine.
1431 static int interpret_errors(void)
1436 DPRINT("-- FDC reply error");
1441 /* check IC to find cause of interrupt */
1442 switch (ST0 & ST0_INTR) {
1443 case 0x40: /* error occurred during command execution */
1445 return 0; /* occurs with pseudo-DMA */
1448 DPRINT("Drive is write protected\n");
1449 CLEARF(FD_DISK_WRITABLE);
1452 } else if (ST1 & ST1_ND) {
1453 SETF(FD_NEED_TWADDLE);
1454 } else if (ST1 & ST1_OR) {
1455 if (DP->flags & FTD_MSG)
1456 DPRINT("Over/Underrun - retrying\n");
1458 } else if (*errors >= DP->max_errors.reporting) {
1460 if (ST0 & ST0_ECE) {
1461 printk("Recalibrate failed!");
1462 } else if (ST2 & ST2_CRC) {
1463 printk("data CRC error");
1465 } else if (ST1 & ST1_CRC) {
1466 printk("CRC error");
1468 } else if ((ST1 & (ST1_MAM | ST1_ND))
1469 || (ST2 & ST2_MAM)) {
1471 printk("sector not found");
1474 printk("probe failed...");
1475 } else if (ST2 & ST2_WC) { /* seek error */
1476 printk("wrong cylinder");
1477 } else if (ST2 & ST2_BC) { /* cylinder marked as bad */
1478 printk("bad cylinder");
1481 ("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x",
1488 if (ST2 & ST2_WC || ST2 & ST2_BC)
1489 /* wrong cylinder => recal */
1490 DRS->track = NEED_2_RECAL;
1492 case 0x80: /* invalid command given */
1493 DPRINT("Invalid FDC command given!\n");
1497 DPRINT("Abnormal termination caused by polling\n");
1500 default: /* (0) Normal command termination */
1506 * This routine is called when everything should be correctly set up
1507 * for the transfer (i.e. floppy motor is on, the correct floppy is
1508 * selected, and the head is sitting on the right track).
1510 static void setup_rw_floppy(void)
1512 int i, r, flags, dflags;
1513 unsigned long ready_date;
1514 timeout_fn function;
1516 flags = raw_cmd->flags;
1517 if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1518 flags |= FD_RAW_INTR;
1520 if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)) {
1521 ready_date = DRS->spinup_date + DP->spinup;
1522 /* If spinup will take a long time, rerun scandrives
1523 * again just before spinup completion. Beware that
1524 * after scandrives, we must again wait for selection.
1526 if ((signed)(ready_date - jiffies) > DP->select_delay) {
1527 ready_date -= DP->select_delay;
1528 function = (timeout_fn) floppy_start;
1530 function = (timeout_fn) setup_rw_floppy;
1532 /* wait until the floppy is spinning fast enough */
1533 if (fd_wait_for_completion(ready_date, function))
1536 dflags = DRS->flags;
1538 if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1541 if (flags & FD_RAW_INTR)
1542 do_floppy = main_command_interrupt;
1545 for (i = 0; i < raw_cmd->cmd_count; i++)
1546 r |= output_byte(raw_cmd->cmd[i]);
1548 debugt("rw_command: ");
1556 if (!(flags & FD_RAW_INTR)) {
1559 } else if (flags & FD_RAW_NEED_DISK)
1563 static int blind_seek;
1566 * This is the routine called after every seek (or recalibrate) interrupt
1567 * from the floppy controller.
1569 static void seek_interrupt(void)
1571 debugt("seek interrupt:");
1572 if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1573 DPRINT("seek failed\n");
1574 DRS->track = NEED_2_RECAL;
1579 if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek) {
1581 if (DP->flags & FD_DEBUG) {
1583 ("clearing NEWCHANGE flag because of effective seek\n");
1584 DPRINT("jiffies=%lu\n", jiffies);
1587 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1588 DRS->select_date = jiffies;
1594 static void check_wp(void)
1596 if (TESTF(FD_VERIFY)) {
1597 /* check write protection */
1598 output_byte(FD_GETSTATUS);
1599 output_byte(UNIT(current_drive));
1600 if (result() != 1) {
1605 CLEARF(FD_NEED_TWADDLE);
1607 if (DP->flags & FD_DEBUG) {
1608 DPRINT("checking whether disk is write protected\n");
1609 DPRINT("wp=%x\n", ST3 & 0x40);
1613 SETF(FD_DISK_WRITABLE);
1615 CLEARF(FD_DISK_WRITABLE);
1619 static void seek_floppy(void)
1626 if (DP->flags & FD_DEBUG) {
1627 DPRINT("calling disk change from seek\n");
1631 if (!TESTF(FD_DISK_NEWCHANGE) &&
1632 disk_change(current_drive) && (raw_cmd->flags & FD_RAW_NEED_DISK)) {
1633 /* the media changed flag should be cleared after the seek.
1634 * If it isn't, this means that there is really no disk in
1637 SETF(FD_DISK_CHANGED);
1642 if (DRS->track <= NEED_1_RECAL) {
1643 recalibrate_floppy();
1645 } else if (TESTF(FD_DISK_NEWCHANGE) &&
1646 (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1647 (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1648 /* we seek to clear the media-changed condition. Does anybody
1649 * know a more elegant way, which works on all drives? */
1651 track = raw_cmd->track - 1;
1653 if (DP->flags & FD_SILENT_DCL_CLEAR) {
1654 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1656 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1662 if (raw_cmd->track != DRS->track &&
1663 (raw_cmd->flags & FD_RAW_NEED_SEEK))
1664 track = raw_cmd->track;
1671 do_floppy = seek_interrupt;
1672 output_byte(FD_SEEK);
1673 output_byte(UNIT(current_drive));
1675 debugt("seek command:");
1678 static void recal_interrupt(void)
1680 debugt("recal interrupt:");
1683 else if (ST0 & ST0_ECE) {
1684 switch (DRS->track) {
1686 debugt("recal interrupt need 1 recal:");
1687 /* after a second recalibrate, we still haven't
1688 * reached track 0. Probably no drive. Raise an
1689 * error, as failing immediately might upset
1690 * computers possessed by the Devil :-) */
1695 debugt("recal interrupt need 2 recal:");
1696 /* If we already did a recalibrate,
1697 * and we are not at track 0, this
1698 * means we have moved. (The only way
1699 * not to move at recalibration is to
1700 * be already at track 0.) Clear the
1701 * new change flag */
1703 if (DP->flags & FD_DEBUG) {
1705 ("clearing NEWCHANGE flag because of second recalibrate\n");
1709 CLEARF(FD_DISK_NEWCHANGE);
1710 DRS->select_date = jiffies;
1713 debugt("recal interrupt default:");
1714 /* Recalibrate moves the head by at
1715 * most 80 steps. If after one
1716 * recalibrate we don't have reached
1717 * track 0, this might mean that we
1718 * started beyond track 80. Try
1720 DRS->track = NEED_1_RECAL;
1728 static void print_result(char *message, int inr)
1732 DPRINT("%s ", message);
1734 for (i = 0; i < inr; i++)
1735 printk("repl[%d]=%x ", i, reply_buffer[i]);
1739 /* interrupt handler. Note that this can be called externally on the Sparc */
1740 irqreturn_t floppy_interrupt(int irq, void *dev_id, struct pt_regs *regs)
1742 void (*handler) (void) = do_floppy;
1746 lasthandler = handler;
1747 interruptjiffies = jiffies;
1749 f = claim_dma_lock();
1751 release_dma_lock(f);
1753 floppy_enable_hlt();
1755 if (fdc >= N_FDC || FDCS->address == -1) {
1756 /* we don't even know which FDC is the culprit */
1757 printk("DOR0=%x\n", fdc_state[0].dor);
1758 printk("floppy interrupt on bizarre fdc %d\n", fdc);
1759 printk("handler=%p\n", handler);
1760 is_alive("bizarre fdc");
1765 /* We have to clear the reset flag here, because apparently on boxes
1766 * with level triggered interrupts (PS/2, Sparc, ...), it is needed to
1767 * emit SENSEI's to clear the interrupt line. And FDCS->reset blocks the
1768 * emission of the SENSEI's.
1769 * It is OK to emit floppy commands because we are in an interrupt
1770 * handler here, and thus we have to fear no interference of other
1774 do_print = !handler && print_unex && !initialising;
1778 print_result("unexpected interrupt", inr);
1782 output_byte(FD_SENSEI);
1785 print_result("sensei", inr);
1787 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2
1791 schedule_bh(handler);
1794 is_alive("normal interrupt end");
1796 /* FIXME! Was it really for us? */
1800 static void recalibrate_floppy(void)
1802 debugt("recalibrate floppy:");
1803 do_floppy = recal_interrupt;
1804 output_byte(FD_RECALIBRATE);
1805 LAST_OUT(UNIT(current_drive));
1809 * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1811 static void reset_interrupt(void)
1813 debugt("reset interrupt:");
1814 result(); /* get the status ready for set_fdc */
1816 printk("reset set in interrupt, calling %p\n", cont->error);
1817 cont->error(); /* a reset just after a reset. BAD! */
1823 * reset is done by pulling bit 2 of DOR low for a while (old FDCs),
1824 * or by setting the self clearing bit 7 of STATUS (newer FDCs)
1826 static void reset_fdc(void)
1828 unsigned long flags;
1830 do_floppy = reset_interrupt;
1834 /* Pseudo-DMA may intercept 'reset finished' interrupt. */
1835 /* Irrelevant for systems with true DMA (i386). */
1837 flags = claim_dma_lock();
1839 release_dma_lock(flags);
1841 if (FDCS->version >= FDC_82072A)
1842 fd_outb(0x80 | (FDCS->dtr & 3), FD_STATUS);
1844 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1845 udelay(FD_RESET_DELAY);
1846 fd_outb(FDCS->dor, FD_DOR);
1850 static void show_floppy(void)
1855 printk("floppy driver state\n");
1856 printk("-------------------\n");
1857 printk("now=%lu last interrupt=%lu diff=%lu last called handler=%p\n",
1858 jiffies, interruptjiffies, jiffies - interruptjiffies,
1861 #ifdef FLOPPY_SANITY_CHECK
1862 printk("timeout_message=%s\n", timeout_message);
1863 printk("last output bytes:\n");
1864 for (i = 0; i < OLOGSIZE; i++)
1865 printk("%2x %2x %lu\n",
1866 output_log[(i + output_log_pos) % OLOGSIZE].data,
1867 output_log[(i + output_log_pos) % OLOGSIZE].status,
1868 output_log[(i + output_log_pos) % OLOGSIZE].jiffies);
1869 printk("last result at %lu\n", resultjiffies);
1870 printk("last redo_fd_request at %lu\n", lastredo);
1871 for (i = 0; i < resultsize; i++) {
1872 printk("%2x ", reply_buffer[i]);
1877 printk("status=%x\n", fd_inb(FD_STATUS));
1878 printk("fdc_busy=%lu\n", fdc_busy);
1880 printk("do_floppy=%p\n", do_floppy);
1881 if (floppy_work.pending)
1882 printk("floppy_work.func=%p\n", floppy_work.func);
1883 if (timer_pending(&fd_timer))
1884 printk("fd_timer.function=%p\n", fd_timer.function);
1885 if (timer_pending(&fd_timeout)) {
1886 printk("timer_function=%p\n", fd_timeout.function);
1887 printk("expires=%lu\n", fd_timeout.expires - jiffies);
1888 printk("now=%lu\n", jiffies);
1890 printk("cont=%p\n", cont);
1891 printk("current_req=%p\n", current_req);
1892 printk("command_status=%d\n", command_status);
1896 static void floppy_shutdown(unsigned long data)
1898 unsigned long flags;
1904 floppy_enable_hlt();
1906 flags = claim_dma_lock();
1908 release_dma_lock(flags);
1910 /* avoid dma going to a random drive after shutdown */
1913 DPRINT("floppy timeout called\n");
1917 cont->redo(); /* this will recall reset when needed */
1919 printk("no cont in shutdown!\n");
1920 process_fd_request();
1922 is_alive("floppy shutdown");
1925 /*typedef void (*timeout_fn)(unsigned long);*/
1927 /* start motor, check media-changed condition and write protection */
1928 static int start_motor(void (*function) (void))
1933 data = UNIT(current_drive);
1934 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)) {
1935 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))) {
1937 /* no read since this drive is running */
1938 DRS->first_read_date = 0;
1939 /* note motor start time if motor is not yet running */
1940 DRS->spinup_date = jiffies;
1941 data |= (0x10 << UNIT(current_drive));
1943 } else if (FDCS->dor & (0x10 << UNIT(current_drive)))
1944 mask &= ~(0x10 << UNIT(current_drive));
1946 /* starts motor and selects floppy */
1947 del_timer(motor_off_timer + current_drive);
1948 set_dor(fdc, mask, data);
1950 /* wait_for_completion also schedules reset if needed. */
1951 return (fd_wait_for_completion(DRS->select_date + DP->select_delay,
1952 (timeout_fn) function));
1955 static void floppy_ready(void)
1958 if (start_motor(floppy_ready))
1964 if (DP->flags & FD_DEBUG) {
1965 DPRINT("calling disk change from floppy_ready\n");
1968 if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1969 disk_change(current_drive) && !DP->select_delay)
1970 twaddle(); /* this clears the dcl on certain drive/controller
1973 #ifdef fd_chose_dma_mode
1974 if ((raw_cmd->flags & FD_RAW_READ) || (raw_cmd->flags & FD_RAW_WRITE)) {
1975 unsigned long flags = claim_dma_lock();
1976 fd_chose_dma_mode(raw_cmd->kernel_data, raw_cmd->length);
1977 release_dma_lock(flags);
1981 if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)) {
1982 perpendicular_mode();
1983 fdc_specify(); /* must be done here because of hut, hlt ... */
1986 if ((raw_cmd->flags & FD_RAW_READ) ||
1987 (raw_cmd->flags & FD_RAW_WRITE))
1993 static void floppy_start(void)
1995 reschedule_timeout(current_reqD, "floppy start", 0);
1999 if (DP->flags & FD_DEBUG) {
2000 DPRINT("setting NEWCHANGE in floppy_start\n");
2003 SETF(FD_DISK_NEWCHANGE);
2008 * ========================================================================
2009 * here ends the bottom half. Exported routines are:
2010 * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
2011 * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
2012 * Initialization also uses output_byte, result, set_dor, floppy_interrupt
2014 * ========================================================================
2017 * General purpose continuations.
2018 * ==============================
2021 static void do_wakeup(void)
2023 reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
2025 command_status += 2;
2026 wake_up(&command_done);
2029 static struct cont_t wakeup_cont = {
2033 .done = (done_f) empty
2036 static struct cont_t intr_cont = {
2038 .redo = process_fd_request,
2040 .done = (done_f) empty
2043 static int wait_til_done(void (*handler) (void), int interruptible)
2047 schedule_bh(handler);
2049 if (command_status < 2 && NO_SIGNAL) {
2050 DECLARE_WAITQUEUE(wait, current);
2052 add_wait_queue(&command_done, &wait);
2054 set_current_state(interruptible ?
2055 TASK_INTERRUPTIBLE :
2056 TASK_UNINTERRUPTIBLE);
2058 if (command_status >= 2 || !NO_SIGNAL)
2061 is_alive("wait_til_done");
2066 set_current_state(TASK_RUNNING);
2067 remove_wait_queue(&command_done, &wait);
2070 if (command_status < 2) {
2078 command_status = FD_COMMAND_ERROR;
2079 if (command_status == FD_COMMAND_OKAY)
2083 command_status = FD_COMMAND_NONE;
2087 static void generic_done(int result)
2089 command_status = result;
2090 cont = &wakeup_cont;
2093 static void generic_success(void)
2098 static void generic_failure(void)
2103 static void success_and_wakeup(void)
2110 * formatting and rw support.
2111 * ==========================
2114 static int next_valid_format(void)
2118 probed_format = DRS->probed_format;
2120 if (probed_format >= 8 || !DP->autodetect[probed_format]) {
2121 DRS->probed_format = 0;
2124 if (floppy_type[DP->autodetect[probed_format]].sect) {
2125 DRS->probed_format = probed_format;
2132 static void bad_flp_intr(void)
2137 DRS->probed_format++;
2138 if (!next_valid_format())
2141 err_count = ++(*errors);
2142 INFBOUND(DRWE->badness, err_count);
2143 if (err_count > DP->max_errors.abort)
2145 if (err_count > DP->max_errors.reset)
2147 else if (err_count > DP->max_errors.recal)
2148 DRS->track = NEED_2_RECAL;
2151 static void set_floppy(int drive)
2153 int type = ITYPE(UDRS->fd_device);
2155 _floppy = floppy_type + type;
2157 _floppy = current_type[drive];
2161 * formatting support.
2162 * ===================
2164 static void format_interrupt(void)
2166 switch (interpret_errors()) {
2177 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
2178 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
2179 #define CT(x) ((x) | 0xc0)
2180 static void setup_format_params(int track)
2183 unsigned char track, head, sect, size;
2184 } *here = (struct fparm *)floppy_track_buffer;
2186 int count, head_shift, track_shift;
2188 raw_cmd = &default_raw_cmd;
2189 raw_cmd->track = track;
2191 raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2192 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
2193 raw_cmd->rate = _floppy->rate & 0x43;
2194 raw_cmd->cmd_count = NR_F;
2195 COMMAND = FM_MODE(_floppy, FD_FORMAT);
2196 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, format_req.head);
2197 F_SIZECODE = FD_SIZECODE(_floppy);
2198 F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2199 F_GAP = _floppy->fmt_gap;
2200 F_FILL = FD_FILL_BYTE;
2202 raw_cmd->kernel_data = floppy_track_buffer;
2203 raw_cmd->length = 4 * F_SECT_PER_TRACK;
2205 /* allow for about 30ms for data transport per track */
2206 head_shift = (F_SECT_PER_TRACK + 5) / 6;
2208 /* a ``cylinder'' is two tracks plus a little stepping time */
2209 track_shift = 2 * head_shift + 3;
2211 /* position of logical sector 1 on this track */
2212 n = (track_shift * format_req.track + head_shift * format_req.head)
2215 /* determine interleave */
2217 if (_floppy->fmt_gap < 0x22)
2220 /* initialize field */
2221 for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2222 here[count].track = format_req.track;
2223 here[count].head = format_req.head;
2224 here[count].sect = 0;
2225 here[count].size = F_SIZECODE;
2227 /* place logical sectors */
2228 for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2229 here[n].sect = count;
2230 n = (n + il) % F_SECT_PER_TRACK;
2231 if (here[n].sect) { /* sector busy, find next free sector */
2233 if (n >= F_SECT_PER_TRACK) {
2234 n -= F_SECT_PER_TRACK;
2235 while (here[n].sect)
2240 if (_floppy->stretch & FD_ZEROBASED) {
2241 for (count = 0; count < F_SECT_PER_TRACK; count++)
2246 static void redo_format(void)
2249 setup_format_params(format_req.track << STRETCH(_floppy));
2251 debugt("queue format request");
2254 static struct cont_t format_cont = {
2255 .interrupt = format_interrupt,
2256 .redo = redo_format,
2257 .error = bad_flp_intr,
2258 .done = generic_done
2261 static int do_format(int drive, struct format_descr *tmp_format_req)
2268 _floppy->track > DP->tracks ||
2269 tmp_format_req->track >= _floppy->track ||
2270 tmp_format_req->head >= _floppy->head ||
2271 (_floppy->sect << 2) % (1 << FD_SIZECODE(_floppy)) ||
2272 !_floppy->fmt_gap) {
2273 process_fd_request();
2276 format_req = *tmp_format_req;
2278 cont = &format_cont;
2279 errors = &format_errors;
2281 process_fd_request();
2286 * Buffer read/write and support
2287 * =============================
2290 static void floppy_end_request(struct request *req, int uptodate)
2292 unsigned int nr_sectors = current_count_sectors;
2294 /* current_count_sectors can be zero if transfer failed */
2296 nr_sectors = req->current_nr_sectors;
2297 if (end_that_request_first(req, uptodate, nr_sectors))
2299 add_disk_randomness(req->rq_disk);
2300 floppy_off((long)req->rq_disk->private_data);
2301 blkdev_dequeue_request(req);
2302 end_that_request_last(req);
2304 /* We're done with the request */
2308 /* new request_done. Can handle physical sectors which are smaller than a
2310 static void request_done(int uptodate)
2312 struct request_queue *q = floppy_queue;
2313 struct request *req = current_req;
2314 unsigned long flags;
2318 reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2321 printk("floppy.c: no request in request_done\n");
2326 /* maintain values for invalidation on geometry
2328 block = current_count_sectors + req->sector;
2329 INFBOUND(DRS->maxblock, block);
2330 if (block > _floppy->sect)
2333 /* unlock chained buffers */
2334 spin_lock_irqsave(q->queue_lock, flags);
2335 floppy_end_request(req, 1);
2336 spin_unlock_irqrestore(q->queue_lock, flags);
2338 if (rq_data_dir(req) == WRITE) {
2339 /* record write error information */
2340 DRWE->write_errors++;
2341 if (DRWE->write_errors == 1) {
2342 DRWE->first_error_sector = req->sector;
2343 DRWE->first_error_generation = DRS->generation;
2345 DRWE->last_error_sector = req->sector;
2346 DRWE->last_error_generation = DRS->generation;
2348 spin_lock_irqsave(q->queue_lock, flags);
2349 floppy_end_request(req, 0);
2350 spin_unlock_irqrestore(q->queue_lock, flags);
2354 /* Interrupt handler evaluating the result of the r/w operation */
2355 static void rw_interrupt(void)
2357 int nr_sectors, ssize, eoc, heads;
2360 /* some Toshiba floppy controllers occasionnally seem to
2361 * return bogus interrupts after read/write operations, which
2362 * can be recognized by a bad head number (>= 2) */
2366 if (!DRS->first_read_date)
2367 DRS->first_read_date = jiffies;
2382 nr_sectors = (((R_TRACK - TRACK) * heads +
2383 R_HEAD - HEAD) * SECT_PER_TRACK +
2384 R_SECTOR - SECTOR + eoc) << SIZECODE >> 2;
2386 #ifdef FLOPPY_SANITY_CHECK
2387 if (nr_sectors / ssize >
2388 (in_sector_offset + current_count_sectors + ssize - 1) / ssize) {
2389 DPRINT("long rw: %x instead of %lx\n",
2390 nr_sectors, current_count_sectors);
2391 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2392 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2393 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2394 printk("heads=%d eoc=%d\n", heads, eoc);
2395 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2397 printk("in_sector_offset=%d\n", in_sector_offset);
2401 nr_sectors -= in_sector_offset;
2402 INFBOUND(nr_sectors, 0);
2403 SUPBOUND(current_count_sectors, nr_sectors);
2405 switch (interpret_errors()) {
2410 if (!current_count_sectors) {
2417 if (!current_count_sectors) {
2421 current_type[current_drive] = _floppy;
2422 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2427 if (DP->flags & FTD_MSG)
2428 DPRINT("Auto-detected floppy type %s in fd%d\n",
2429 _floppy->name, current_drive);
2430 current_type[current_drive] = _floppy;
2431 floppy_sizes[TOMINOR(current_drive)] = _floppy->size;
2435 if (CT(COMMAND) != FD_READ ||
2436 raw_cmd->kernel_data == current_req->buffer) {
2437 /* transfer directly from buffer */
2439 } else if (CT(COMMAND) == FD_READ) {
2440 buffer_track = raw_cmd->track;
2441 buffer_drive = current_drive;
2442 INFBOUND(buffer_max, nr_sectors + fsector_t);
2447 /* Compute maximal contiguous buffer size. */
2448 static int buffer_chain_size(void)
2455 base = bio_data(current_req->bio);
2458 rq_for_each_bio(bio, current_req) {
2459 bio_for_each_segment(bv, bio, i) {
2460 if (page_address(bv->bv_page) + bv->bv_offset !=
2471 /* Compute the maximal transfer size */
2472 static int transfer_size(int ssize, int max_sector, int max_size)
2474 SUPBOUND(max_sector, fsector_t + max_size);
2477 max_sector -= (max_sector % _floppy->sect) % ssize;
2479 /* transfer size, beginning not aligned */
2480 current_count_sectors = max_sector - fsector_t;
2486 * Move data from/to the track buffer to/from the buffer cache.
2488 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
2490 int remaining; /* number of transferred 512-byte sectors */
2493 char *buffer, *dma_buffer;
2496 max_sector = transfer_size(ssize,
2497 min(max_sector, max_sector_2),
2498 current_req->nr_sectors);
2500 if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2501 buffer_max > fsector_t + current_req->nr_sectors)
2502 current_count_sectors = min_t(int, buffer_max - fsector_t,
2503 current_req->nr_sectors);
2505 remaining = current_count_sectors << 9;
2506 #ifdef FLOPPY_SANITY_CHECK
2507 if ((remaining >> 9) > current_req->nr_sectors &&
2508 CT(COMMAND) == FD_WRITE) {
2509 DPRINT("in copy buffer\n");
2510 printk("current_count_sectors=%ld\n", current_count_sectors);
2511 printk("remaining=%d\n", remaining >> 9);
2512 printk("current_req->nr_sectors=%ld\n",
2513 current_req->nr_sectors);
2514 printk("current_req->current_nr_sectors=%u\n",
2515 current_req->current_nr_sectors);
2516 printk("max_sector=%d\n", max_sector);
2517 printk("ssize=%d\n", ssize);
2521 buffer_max = max(max_sector, buffer_max);
2523 dma_buffer = floppy_track_buffer + ((fsector_t - buffer_min) << 9);
2525 size = current_req->current_nr_sectors << 9;
2527 rq_for_each_bio(bio, current_req) {
2528 bio_for_each_segment(bv, bio, i) {
2533 SUPBOUND(size, remaining);
2535 buffer = page_address(bv->bv_page) + bv->bv_offset;
2536 #ifdef FLOPPY_SANITY_CHECK
2537 if (dma_buffer + size >
2538 floppy_track_buffer + (max_buffer_sectors << 10) ||
2539 dma_buffer < floppy_track_buffer) {
2540 DPRINT("buffer overrun in copy buffer %d\n",
2541 (int)((floppy_track_buffer -
2543 printk("fsector_t=%d buffer_min=%d\n",
2544 fsector_t, buffer_min);
2545 printk("current_count_sectors=%ld\n",
2546 current_count_sectors);
2547 if (CT(COMMAND) == FD_READ)
2549 if (CT(COMMAND) == FD_WRITE)
2553 if (((unsigned long)buffer) % 512)
2554 DPRINT("%p buffer not aligned\n", buffer);
2556 if (CT(COMMAND) == FD_READ)
2557 memcpy(buffer, dma_buffer, size);
2559 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)
2596 int hard_sectors, end_sector;
2598 if (CT(COMMAND) == FD_WRITE) {
2599 COMMAND &= ~0x80; /* switch off multiple track mode */
2601 hard_sectors = raw_cmd->length >> (7 + SIZECODE);
2602 end_sector = SECTOR + hard_sectors - 1;
2603 #ifdef FLOPPY_SANITY_CHECK
2604 if (end_sector > SECT_PER_TRACK) {
2605 printk("too many sectors %d > %d\n",
2606 end_sector, SECT_PER_TRACK);
2610 SECT_PER_TRACK = end_sector; /* make sure SECT_PER_TRACK points
2611 * to end of transfer */
2616 * Formulate a read/write request.
2617 * this routine decides where to load the data (directly to buffer, or to
2618 * tmp floppy area), how much data to load (the size of the buffer, the whole
2619 * track, or a single sector)
2620 * All floppy_track_buffer handling goes in here. If we ever add track buffer
2621 * allocation on the fly, it should be done here. No other part should need
2625 static int make_raw_rw_request(void)
2627 int aligned_sector_t;
2628 int max_sector, max_size, tracksize, ssize;
2630 if (max_buffer_sectors == 0) {
2631 printk("VFS: Block I/O scheduled on unopened device\n");
2635 set_fdc((long)current_req->rq_disk->private_data);
2637 raw_cmd = &default_raw_cmd;
2638 raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2640 raw_cmd->cmd_count = NR_RW;
2641 if (rq_data_dir(current_req) == READ) {
2642 raw_cmd->flags |= FD_RAW_READ;
2643 COMMAND = FM_MODE(_floppy, FD_READ);
2644 } else if (rq_data_dir(current_req) == WRITE) {
2645 raw_cmd->flags |= FD_RAW_WRITE;
2646 COMMAND = FM_MODE(_floppy, FD_WRITE);
2648 DPRINT("make_raw_rw_request: unknown command\n");
2652 max_sector = _floppy->sect * _floppy->head;
2654 TRACK = (int)current_req->sector / max_sector;
2655 fsector_t = (int)current_req->sector % max_sector;
2656 if (_floppy->track && TRACK >= _floppy->track) {
2657 if (current_req->current_nr_sectors & 1) {
2658 current_count_sectors = 1;
2663 HEAD = fsector_t / _floppy->sect;
2665 if (((_floppy->stretch & (FD_SWAPSIDES | FD_ZEROBASED)) ||
2666 TESTF(FD_NEED_TWADDLE)) && fsector_t < _floppy->sect)
2667 max_sector = _floppy->sect;
2669 /* 2M disks have phantom sectors on the first track */
2670 if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)) {
2671 max_sector = 2 * _floppy->sect / 3;
2672 if (fsector_t >= max_sector) {
2673 current_count_sectors =
2674 min_t(int, _floppy->sect - fsector_t,
2675 current_req->nr_sectors);
2680 SIZECODE = FD_SIZECODE(_floppy);
2681 raw_cmd->rate = _floppy->rate & 0x43;
2682 if ((_floppy->rate & FD_2M) && (TRACK || HEAD) && raw_cmd->rate == 2)
2689 raw_cmd->track = TRACK << STRETCH(_floppy);
2690 DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy, HEAD);
2693 SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2694 SECTOR = ((fsector_t % _floppy->sect) << 2 >> SIZECODE) +
2695 ((_floppy->stretch & FD_ZEROBASED) ? 0 : 1);
2697 /* tracksize describes the size which can be filled up with sectors
2700 tracksize = _floppy->sect - _floppy->sect % ssize;
2701 if (tracksize < _floppy->sect) {
2703 if (tracksize <= fsector_t % _floppy->sect)
2706 /* if we are beyond tracksize, fill up using smaller sectors */
2707 while (tracksize <= fsector_t % _floppy->sect) {
2708 while (tracksize + ssize > _floppy->sect) {
2716 max_sector = HEAD * _floppy->sect + tracksize;
2717 } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing) {
2718 max_sector = _floppy->sect;
2719 } else if (!HEAD && CT(COMMAND) == FD_WRITE) {
2720 /* for virtual DMA bug workaround */
2721 max_sector = _floppy->sect;
2724 in_sector_offset = (fsector_t % _floppy->sect) % ssize;
2725 aligned_sector_t = fsector_t - in_sector_offset;
2726 max_size = current_req->nr_sectors;
2727 if ((raw_cmd->track == buffer_track) &&
2728 (current_drive == buffer_drive) &&
2729 (fsector_t >= buffer_min) && (fsector_t < buffer_max)) {
2730 /* data already in track buffer */
2731 if (CT(COMMAND) == FD_READ) {
2732 copy_buffer(1, max_sector, buffer_max);
2735 } else if (in_sector_offset || current_req->nr_sectors < ssize) {
2736 if (CT(COMMAND) == FD_WRITE) {
2737 if (fsector_t + current_req->nr_sectors > ssize &&
2738 fsector_t + current_req->nr_sectors < ssize + ssize)
2739 max_size = ssize + ssize;
2743 raw_cmd->flags &= ~FD_RAW_WRITE;
2744 raw_cmd->flags |= FD_RAW_READ;
2745 COMMAND = FM_MODE(_floppy, FD_READ);
2746 } else if ((unsigned long)current_req->buffer < MAX_DMA_ADDRESS) {
2747 unsigned long dma_limit;
2748 int direct, indirect;
2751 transfer_size(ssize, max_sector,
2752 max_buffer_sectors * 2) - fsector_t;
2755 * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2756 * on a 64 bit machine!
2758 max_size = buffer_chain_size();
2761 ((unsigned long)current_req->buffer)) >> 9;
2762 if ((unsigned long)max_size > dma_limit) {
2763 max_size = dma_limit;
2765 /* 64 kb boundaries */
2766 if (CROSS_64KB(current_req->buffer, max_size << 9))
2768 ((unsigned long)current_req->buffer) %
2770 direct = transfer_size(ssize, max_sector, max_size) - fsector_t;
2772 * We try to read tracks, but if we get too many errors, we
2773 * go back to reading just one sector at a time.
2775 * This means we should be able to read a sector even if there
2776 * are other bad sectors on this track.
2779 (indirect * 2 > direct * 3 &&
2780 *errors < DP->max_errors.read_track &&
2781 /*!TESTF(FD_NEED_TWADDLE) && */
2783 || (DP->read_track & (1 << DRS->probed_format)))))) {
2784 max_size = current_req->nr_sectors;
2786 raw_cmd->kernel_data = current_req->buffer;
2787 raw_cmd->length = current_count_sectors << 9;
2788 if (raw_cmd->length == 0) {
2790 ("zero dma transfer attempted from make_raw_request\n");
2791 DPRINT("indirect=%d direct=%d fsector_t=%d",
2792 indirect, direct, fsector_t);
2795 /* check_dma_crossing(raw_cmd->kernel_data,
2797 "end of make_raw_request [1]");*/
2799 virtualdmabug_workaround();
2804 if (CT(COMMAND) == FD_READ)
2805 max_size = max_sector; /* unbounded */
2807 /* claim buffer track if needed */
2808 if (buffer_track != raw_cmd->track || /* bad track */
2809 buffer_drive != current_drive || /* bad drive */
2810 fsector_t > buffer_max ||
2811 fsector_t < buffer_min ||
2812 ((CT(COMMAND) == FD_READ ||
2813 (!in_sector_offset && current_req->nr_sectors >= ssize)) &&
2814 max_sector > 2 * max_buffer_sectors + buffer_min &&
2815 max_size + fsector_t > 2 * max_buffer_sectors + buffer_min)
2816 /* not enough space */
2819 buffer_drive = current_drive;
2820 buffer_max = buffer_min = aligned_sector_t;
2822 raw_cmd->kernel_data = floppy_track_buffer +
2823 ((aligned_sector_t - buffer_min) << 9);
2825 if (CT(COMMAND) == FD_WRITE) {
2826 /* copy write buffer to track buffer.
2827 * if we get here, we know that the write
2828 * is either aligned or the data already in the buffer
2829 * (buffer will be overwritten) */
2830 #ifdef FLOPPY_SANITY_CHECK
2831 if (in_sector_offset && buffer_track == -1)
2832 DPRINT("internal error offset !=0 on write\n");
2834 buffer_track = raw_cmd->track;
2835 buffer_drive = current_drive;
2836 copy_buffer(ssize, max_sector,
2837 2 * max_buffer_sectors + buffer_min);
2839 transfer_size(ssize, max_sector,
2840 2 * max_buffer_sectors + buffer_min -
2843 /* round up current_count_sectors to get dma xfer size */
2844 raw_cmd->length = in_sector_offset + current_count_sectors;
2845 raw_cmd->length = ((raw_cmd->length - 1) | (ssize - 1)) + 1;
2846 raw_cmd->length <<= 9;
2847 #ifdef FLOPPY_SANITY_CHECK
2848 /*check_dma_crossing(raw_cmd->kernel_data, raw_cmd->length,
2849 "end of make_raw_request"); */
2850 if ((raw_cmd->length < current_count_sectors << 9) ||
2851 (raw_cmd->kernel_data != current_req->buffer &&
2852 CT(COMMAND) == FD_WRITE &&
2853 (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2854 aligned_sector_t < buffer_min)) ||
2855 raw_cmd->length % (128 << SIZECODE) ||
2856 raw_cmd->length <= 0 || current_count_sectors <= 0) {
2857 DPRINT("fractionary current count b=%lx s=%lx\n",
2858 raw_cmd->length, current_count_sectors);
2859 if (raw_cmd->kernel_data != current_req->buffer)
2860 printk("addr=%d, length=%ld\n",
2861 (int)((raw_cmd->kernel_data -
2862 floppy_track_buffer) >> 9),
2863 current_count_sectors);
2864 printk("st=%d ast=%d mse=%d msi=%d\n",
2865 fsector_t, aligned_sector_t, max_sector, max_size);
2866 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2867 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2868 COMMAND, SECTOR, HEAD, TRACK);
2869 printk("buffer drive=%d\n", buffer_drive);
2870 printk("buffer track=%d\n", buffer_track);
2871 printk("buffer_min=%d\n", buffer_min);
2872 printk("buffer_max=%d\n", buffer_max);
2876 if (raw_cmd->kernel_data != current_req->buffer) {
2877 if (raw_cmd->kernel_data < floppy_track_buffer ||
2878 current_count_sectors < 0 ||
2879 raw_cmd->length < 0 ||
2880 raw_cmd->kernel_data + raw_cmd->length >
2881 floppy_track_buffer + (max_buffer_sectors << 10)) {
2882 DPRINT("buffer overrun in schedule dma\n");
2883 printk("fsector_t=%d buffer_min=%d current_count=%ld\n",
2884 fsector_t, buffer_min, raw_cmd->length >> 9);
2885 printk("current_count_sectors=%ld\n",
2886 current_count_sectors);
2887 if (CT(COMMAND) == FD_READ)
2889 if (CT(COMMAND) == FD_WRITE)
2893 } else if (raw_cmd->length > current_req->nr_sectors << 9 ||
2894 current_count_sectors > current_req->nr_sectors) {
2895 DPRINT("buffer overrun in direct transfer\n");
2897 } else if (raw_cmd->length < current_count_sectors << 9) {
2898 DPRINT("more sectors than bytes\n");
2899 printk("bytes=%ld\n", raw_cmd->length >> 9);
2900 printk("sectors=%ld\n", current_count_sectors);
2902 if (raw_cmd->length == 0) {
2903 DPRINT("zero dma transfer attempted from make_raw_request\n");
2908 virtualdmabug_workaround();
2912 static void redo_fd_request(void)
2914 #define REPEAT {request_done(0); continue; }
2919 if (current_drive < N_DRIVE)
2920 floppy_off(current_drive);
2924 struct request *req;
2926 spin_lock_irq(floppy_queue->queue_lock);
2927 req = elv_next_request(floppy_queue);
2928 spin_unlock_irq(floppy_queue->queue_lock);
2936 drive = (long)current_req->rq_disk->private_data;
2938 reschedule_timeout(current_reqD, "redo fd request", 0);
2941 raw_cmd = &default_raw_cmd;
2943 if (start_motor(redo_fd_request))
2945 disk_change(current_drive);
2946 if (test_bit(current_drive, &fake_change) ||
2947 TESTF(FD_DISK_CHANGED)) {
2948 DPRINT("disk absent or changed during operation\n");
2951 if (!_floppy) { /* Autodetection */
2953 DRS->probed_format = 0;
2954 if (next_valid_format()) {
2955 DPRINT("no autodetectable formats\n");
2962 floppy_type + DP->autodetect[DRS->probed_format];
2965 errors = &(current_req->errors);
2966 tmp = make_raw_rw_request();
2972 if (TESTF(FD_NEED_TWADDLE))
2974 schedule_bh(floppy_start);
2975 debugt("queue fd request");
2981 static struct cont_t rw_cont = {
2982 .interrupt = rw_interrupt,
2983 .redo = redo_fd_request,
2984 .error = bad_flp_intr,
2985 .done = request_done
2988 static void process_fd_request(void)
2991 schedule_bh(redo_fd_request);
2994 static void do_fd_request(request_queue_t * q)
2996 if (max_buffer_sectors == 0) {
2997 printk("VFS: do_fd_request called on non-open device\n");
3001 if (usage_count == 0) {
3002 printk("warning: usage count=0, current_req=%p exiting\n",
3004 printk("sect=%ld flags=%lx\n", (long)current_req->sector,
3005 current_req->flags);
3008 if (test_bit(0, &fdc_busy)) {
3009 /* fdc busy, this new request will be treated when the
3010 current one is done */
3011 is_alive("do fd request, old request running");
3014 lock_fdc(MAXTIMEOUT, 0);
3015 process_fd_request();
3016 is_alive("do fd request");
3019 static struct cont_t poll_cont = {
3020 .interrupt = success_and_wakeup,
3021 .redo = floppy_ready,
3022 .error = generic_failure,
3023 .done = generic_done
3026 static int poll_drive(int interruptible, int flag)
3029 /* no auto-sense, just clear dcl */
3030 raw_cmd = &default_raw_cmd;
3031 raw_cmd->flags = flag;
3033 raw_cmd->cmd_count = 0;
3036 if (DP->flags & FD_DEBUG) {
3037 DPRINT("setting NEWCHANGE in poll_drive\n");
3040 SETF(FD_DISK_NEWCHANGE);
3046 * User triggered reset
3047 * ====================
3050 static void reset_intr(void)
3052 printk("weird, reset interrupt called\n");
3055 static struct cont_t reset_cont = {
3056 .interrupt = reset_intr,
3057 .redo = success_and_wakeup,
3058 .error = generic_failure,
3059 .done = generic_done
3062 static int user_reset_fdc(int drive, int arg, int interruptible)
3067 LOCK_FDC(drive, interruptible);
3068 if (arg == FD_RESET_ALWAYS)
3074 process_fd_request();
3079 * Misc Ioctl's and support
3080 * ========================
3082 static inline int fd_copyout(void __user *param, const void *address,
3085 return copy_to_user(param, address, size) ? -EFAULT : 0;
3088 static inline int fd_copyin(void __user *param, void *address, unsigned long size)
3090 return copy_from_user(address, param, size) ? -EFAULT : 0;
3093 #define _COPYOUT(x) (copy_to_user((void __user *)param, &(x), sizeof(x)) ? -EFAULT : 0)
3094 #define _COPYIN(x) (copy_from_user(&(x), (void __user *)param, sizeof(x)) ? -EFAULT : 0)
3096 #define COPYOUT(x) ECALL(_COPYOUT(x))
3097 #define COPYIN(x) ECALL(_COPYIN(x))
3099 static inline const char *drive_name(int type, int drive)
3101 struct floppy_struct *floppy;
3104 floppy = floppy_type + type;
3106 if (UDP->native_format)
3107 floppy = floppy_type + UDP->native_format;
3112 return floppy->name;
3118 static void raw_cmd_done(int flag)
3123 raw_cmd->flags |= FD_RAW_FAILURE;
3124 raw_cmd->flags |= FD_RAW_HARDFAILURE;
3126 raw_cmd->reply_count = inr;
3127 if (raw_cmd->reply_count > MAX_REPLIES)
3128 raw_cmd->reply_count = 0;
3129 for (i = 0; i < raw_cmd->reply_count; i++)
3130 raw_cmd->reply[i] = reply_buffer[i];
3132 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3133 unsigned long flags;
3134 flags = claim_dma_lock();
3135 raw_cmd->length = fd_get_dma_residue();
3136 release_dma_lock(flags);
3139 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
3140 (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
3141 raw_cmd->flags |= FD_RAW_FAILURE;
3143 if (disk_change(current_drive))
3144 raw_cmd->flags |= FD_RAW_DISK_CHANGE;
3146 raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
3147 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
3148 motor_off_callback(current_drive);
3150 if (raw_cmd->next &&
3151 (!(raw_cmd->flags & FD_RAW_FAILURE) ||
3152 !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
3153 ((raw_cmd->flags & FD_RAW_FAILURE) ||
3154 !(raw_cmd->flags & FD_RAW_STOP_IF_SUCCESS))) {
3155 raw_cmd = raw_cmd->next;
3162 static struct cont_t raw_cmd_cont = {
3163 .interrupt = success_and_wakeup,
3164 .redo = floppy_start,
3165 .error = generic_failure,
3166 .done = raw_cmd_done
3169 static inline int raw_cmd_copyout(int cmd, char __user *param,
3170 struct floppy_raw_cmd *ptr)
3176 param += sizeof(struct floppy_raw_cmd);
3177 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length) {
3178 if (ptr->length >= 0
3179 && ptr->length <= ptr->buffer_length)
3181 (ptr->data, ptr->kernel_data,
3182 ptr->buffer_length - ptr->length));
3189 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
3191 struct floppy_raw_cmd *next, *this;
3196 if (this->buffer_length) {
3197 fd_dma_mem_free((unsigned long)this->kernel_data,
3198 this->buffer_length);
3199 this->buffer_length = 0;
3207 static inline int raw_cmd_copyin(int cmd, char __user *param,
3208 struct floppy_raw_cmd **rcmd)
3210 struct floppy_raw_cmd *ptr;
3216 ptr = (struct floppy_raw_cmd *)
3217 kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
3223 ptr->buffer_length = 0;
3224 param += sizeof(struct floppy_raw_cmd);
3225 if (ptr->cmd_count > 33)
3226 /* the command may now also take up the space
3227 * initially intended for the reply & the
3228 * reply count. Needed for long 82078 commands
3229 * such as RESTORE, which takes ... 17 command
3230 * bytes. Murphy's law #137: When you reserve
3231 * 16 bytes for a structure, you'll one day
3232 * discover that you really need 17...
3236 for (i = 0; i < 16; i++)
3238 ptr->resultcode = 0;
3239 ptr->kernel_data = NULL;
3241 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3242 if (ptr->length <= 0)
3245 (char *)fd_dma_mem_alloc(ptr->length);
3246 fallback_on_nodma_alloc(&ptr->kernel_data, ptr->length);
3247 if (!ptr->kernel_data)
3249 ptr->buffer_length = ptr->length;
3251 if (ptr->flags & FD_RAW_WRITE)
3252 ECALL(fd_copyin(ptr->data, ptr->kernel_data,
3254 rcmd = &(ptr->next);
3255 if (!(ptr->flags & FD_RAW_MORE))
3261 static int raw_cmd_ioctl(int cmd, void __user *param)
3263 int drive, ret, ret2;
3264 struct floppy_raw_cmd *my_raw_cmd;
3266 if (FDCS->rawcmd <= 1)
3268 for (drive = 0; drive < N_DRIVE; drive++) {
3269 if (FDC(drive) != fdc)
3271 if (drive == current_drive) {
3272 if (UDRS->fd_ref > 1) {
3276 } else if (UDRS->fd_ref) {
3285 ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3287 raw_cmd_free(&my_raw_cmd);
3291 raw_cmd = my_raw_cmd;
3292 cont = &raw_cmd_cont;
3293 ret = wait_til_done(floppy_start, 1);
3295 if (DP->flags & FD_DEBUG) {
3296 DPRINT("calling disk change from raw_cmd ioctl\n");
3300 if (ret != -EINTR && FDCS->reset)
3303 DRS->track = NO_TRACK;
3305 ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3308 raw_cmd_free(&my_raw_cmd);
3312 static int invalidate_drive(struct block_device *bdev)
3314 /* invalidate the buffer track to force a reread */
3315 set_bit((long)bdev->bd_disk->private_data, &fake_change);
3316 process_fd_request();
3317 check_disk_change(bdev);
3321 static inline void clear_write_error(int drive)
3326 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
3327 int drive, int type, struct block_device *bdev)
3331 /* sanity checking for parameters. */
3334 g->track <= 0 || g->track > UDP->tracks >> STRETCH(g) ||
3335 /* check if reserved bits are set */
3336 (g->stretch & ~(FD_STRETCH | FD_SWAPSIDES | FD_ZEROBASED)) != 0)
3339 if (!capable(CAP_SYS_ADMIN))
3343 floppy_type[type] = *g;
3344 floppy_type[type].name = "user format";
3345 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3346 floppy_sizes[cnt] = floppy_sizes[cnt + 0x80] =
3347 floppy_type[type].size + 1;
3348 process_fd_request();
3349 for (cnt = 0; cnt < N_DRIVE; cnt++) {
3350 struct block_device *bdev = opened_bdev[cnt];
3351 if (!bdev || ITYPE(drive_state[cnt].fd_device) != type)
3353 __invalidate_device(bdev, 0);
3359 if (cmd != FDDEFPRM)
3360 /* notice a disk change immediately, else
3361 * we lose our settings immediately*/
3362 CALL(poll_drive(1, FD_RAW_NEED_DISK));
3363 oldStretch = g->stretch;
3364 user_params[drive] = *g;
3365 if (buffer_drive == drive)
3366 SUPBOUND(buffer_max, user_params[drive].sect);
3367 current_type[drive] = &user_params[drive];
3368 floppy_sizes[drive] = user_params[drive].size;
3369 if (cmd == FDDEFPRM)
3370 DRS->keep_data = -1;
3373 /* invalidation. Invalidate only when needed, i.e.
3374 * when there are already sectors in the buffer cache
3375 * whose number will change. This is useful, because
3376 * mtools often changes the geometry of the disk after
3377 * looking at the boot block */
3378 if (DRS->maxblock > user_params[drive].sect ||
3380 ((user_params[drive].sect ^ oldStretch) &
3381 (FD_SWAPSIDES | FD_ZEROBASED)))
3382 invalidate_drive(bdev);
3384 process_fd_request();
3389 /* handle obsolete ioctl's */
3390 static int ioctl_table[] = {
3418 static inline int normalize_ioctl(int *cmd, int *size)
3422 for (i = 0; i < ARRAY_SIZE(ioctl_table); i++) {
3423 if ((*cmd & 0xffff) == (ioctl_table[i] & 0xffff)) {
3424 *size = _IOC_SIZE(*cmd);
3425 *cmd = ioctl_table[i];
3426 if (*size > _IOC_SIZE(*cmd)) {
3427 printk("ioctl not yet supported\n");
3436 static int get_floppy_geometry(int drive, int type, struct floppy_struct **g)
3439 *g = &floppy_type[type];
3442 CALL(poll_drive(0, 0));
3443 process_fd_request();
3444 *g = current_type[drive];
3451 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
3452 unsigned long param)
3454 #define FD_IOCTL_ALLOWED ((filp) && (filp)->private_data)
3455 #define OUT(c,x) case c: outparam = (const char *) (x); break
3456 #define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
3458 int drive = (long)inode->i_bdev->bd_disk->private_data;
3459 int i, type = ITYPE(UDRS->fd_device);
3463 struct floppy_struct g; /* geometry */
3464 struct format_descr f;
3465 struct floppy_max_errors max_errors;
3466 struct floppy_drive_params dp;
3467 } inparam; /* parameters coming from user space */
3468 const char *outparam; /* parameters passed back to user space */
3470 /* convert compatibility eject ioctls into floppy eject ioctl.
3471 * We do this in order to provide a means to eject floppy disks before
3472 * installing the new fdutils package */
3473 if (cmd == CDROMEJECT || /* CD-ROM eject */
3474 cmd == 0x6470 /* SunOS floppy eject */ ) {
3475 DPRINT("obsolete eject ioctl\n");
3476 DPRINT("please use floppycontrol --eject\n");
3480 /* generic block device ioctls */
3482 /* the following have been inspired by the corresponding
3483 * code for other block devices. */
3484 struct floppy_struct *g;
3487 struct hd_geometry loc;
3488 ECALL(get_floppy_geometry(drive, type, &g));
3489 loc.heads = g->head;
3490 loc.sectors = g->sect;
3491 loc.cylinders = g->track;
3493 return _COPYOUT(loc);
3497 /* convert the old style command into a new style command */
3498 if ((cmd & 0xff00) == 0x0200) {
3499 ECALL(normalize_ioctl(&cmd, &size));
3503 /* permission checks */
3504 if (((cmd & 0x40) && !FD_IOCTL_ALLOWED) ||
3505 ((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
3509 CLEARSTRUCT(&inparam);
3510 if (_IOC_DIR(cmd) & _IOC_WRITE)
3511 ECALL(fd_copyin((void __user *)param, &inparam, size))
3515 if (UDRS->fd_ref != 1)
3516 /* somebody else has this drive open */
3520 /* do the actual eject. Fails on
3521 * non-Sparc architectures */
3522 ret = fd_eject(UNIT(drive));
3524 USETF(FD_DISK_CHANGED);
3526 process_fd_request();
3530 current_type[drive] = NULL;
3531 floppy_sizes[drive] = MAX_DISK_SIZE << 1;
3532 UDRS->keep_data = 0;
3533 return invalidate_drive(inode->i_bdev);
3536 return set_geometry(cmd, &inparam.g,
3537 drive, type, inode->i_bdev);
3539 ECALL(get_floppy_geometry(drive, type,
3540 (struct floppy_struct **)
3545 UDP->flags |= FTD_MSG;
3548 UDP->flags &= ~FTD_MSG;
3553 CALL(poll_drive(1, FD_RAW_NEED_DISK));
3555 process_fd_request();
3556 if (ret & FD_VERIFY)
3558 if (!(ret & FD_DISK_WRITABLE))
3562 if (UDRS->fd_ref != 1)
3564 return do_format(drive, &inparam.f);
3568 return invalidate_drive(inode->i_bdev);
3570 case FDSETEMSGTRESH:
3571 UDP->max_errors.reporting =
3572 (unsigned short)(param & 0x0f);
3574 OUT(FDGETMAXERRS, &UDP->max_errors);
3575 IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
3578 outparam = drive_name(type, drive);
3579 SUPBOUND(size, strlen(outparam) + 1);
3582 IN(FDSETDRVPRM, UDP, dp);
3583 OUT(FDGETDRVPRM, UDP);
3587 CALL(poll_drive(1, FD_RAW_NEED_DISK));
3588 process_fd_request();
3590 OUT(FDGETDRVSTAT, UDRS);
3593 return user_reset_fdc(drive, (int)param, 1);
3595 OUT(FDGETFDCSTAT, UFDCS);
3600 OUT(FDWERRORGET, UDRWE);
3607 CALL(i = raw_cmd_ioctl(cmd, (void __user *)param));
3608 process_fd_request();
3614 process_fd_request();
3621 if (_IOC_DIR(cmd) & _IOC_READ)
3622 return fd_copyout((void __user *)param, outparam, size);
3629 static void __init config_types(void)
3634 /* read drive info out of physical CMOS */
3637 UDP->cmos = FLOPPY0_TYPE;
3639 if (!UDP->cmos && FLOPPY1_TYPE)
3640 UDP->cmos = FLOPPY1_TYPE;
3643 /* additional physical CMOS drive detection should go here */
3645 for (drive = 0; drive < N_DRIVE; drive++) {
3646 unsigned int type = UDP->cmos;
3647 struct floppy_drive_params *params;
3648 const char *name = NULL;
3649 static char temparea[32];
3651 if (type < NUMBER(default_drive_params)) {
3652 params = &default_drive_params[type].params;
3654 name = default_drive_params[type].name;
3655 allowed_drive_mask |= 1 << drive;
3657 allowed_drive_mask &= ~(1 << drive);
3659 params = &default_drive_params[0].params;
3660 sprintf(temparea, "unknown type %d (usb?)", type);
3664 const char *prepend = ",";
3666 prepend = KERN_INFO "Floppy drive(s):";
3669 printk("%s fd%d is %s", prepend, drive, name);
3670 register_devfs_entries(drive);
3678 static int floppy_release(struct inode *inode, struct file *filp)
3680 int drive = (long)inode->i_bdev->bd_disk->private_data;
3683 if (UDRS->fd_ref < 0)
3685 else if (!UDRS->fd_ref--) {
3686 DPRINT("floppy_release with fd_ref == 0");
3690 opened_bdev[drive] = NULL;
3691 floppy_release_irq_and_dma();
3697 * floppy_open check for aliasing (/dev/fd0 can be the same as
3698 * /dev/PS0 etc), and disallows simultaneous access to the same
3699 * drive with different device numbers.
3701 static int floppy_open(struct inode *inode, struct file *filp)
3703 int drive = (long)inode->i_bdev->bd_disk->private_data;
3709 filp->private_data = (void *)0;
3711 old_dev = UDRS->fd_device;
3712 if (opened_bdev[drive] && opened_bdev[drive] != inode->i_bdev)
3715 if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)) {
3716 USETF(FD_DISK_CHANGED);
3720 if (UDRS->fd_ref == -1 || (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3723 if (floppy_grab_irq_and_dma())
3726 if (filp->f_flags & O_EXCL)
3731 opened_bdev[drive] = inode->i_bdev;
3735 if (!floppy_track_buffer) {
3736 /* if opening an ED drive, reserve a big buffer,
3737 * else reserve a small one */
3738 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3739 try = 64; /* Only 48 actually useful */
3741 try = 32; /* Only 24 actually useful */
3743 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3744 if (!tmp && !floppy_track_buffer) {
3745 try >>= 1; /* buffer only one side */
3747 tmp = (char *)fd_dma_mem_alloc(1024 * try);
3749 if (!tmp && !floppy_track_buffer) {
3750 fallback_on_nodma_alloc(&tmp, 2048 * try);
3752 if (!tmp && !floppy_track_buffer) {
3753 DPRINT("Unable to allocate DMA memory\n");
3756 if (floppy_track_buffer) {
3758 fd_dma_mem_free((unsigned long)tmp, try * 1024);
3760 buffer_min = buffer_max = -1;
3761 floppy_track_buffer = tmp;
3762 max_buffer_sectors = try;
3766 UDRS->fd_device = iminor(inode);
3767 set_capacity(disks[drive], floppy_sizes[iminor(inode)]);
3768 if (old_dev != -1 && old_dev != iminor(inode)) {
3769 if (buffer_drive == drive)
3773 /* Allow ioctls if we have write-permissions even if read-only open.
3774 * Needed so that programs such as fdrawcmd still can work on write
3775 * protected disks */
3776 if (filp->f_mode & 2
3777 || permission(filp->f_dentry->d_inode, 2, NULL) == 0)
3778 filp->private_data = (void *)8;
3780 if (UFDCS->rawcmd == 1)
3783 if (!(filp->f_flags & O_NDELAY)) {
3784 if (filp->f_mode & 3) {
3785 UDRS->last_checked = 0;
3786 check_disk_change(inode->i_bdev);
3787 if (UTESTF(FD_DISK_CHANGED))
3791 if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3797 if (UDRS->fd_ref < 0)
3802 opened_bdev[drive] = NULL;
3803 floppy_release_irq_and_dma();
3810 * Check if the disk has been changed or if a change has been faked.
3812 static int check_floppy_change(struct gendisk *disk)
3814 int drive = (long)disk->private_data;
3816 if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3819 if (UDP->checkfreq < (int)(jiffies - UDRS->last_checked)) {
3820 if (floppy_grab_irq_and_dma()) {
3826 process_fd_request();
3827 floppy_release_irq_and_dma();
3830 if (UTESTF(FD_DISK_CHANGED) ||
3831 UTESTF(FD_VERIFY) ||
3832 test_bit(drive, &fake_change) ||
3833 (!ITYPE(UDRS->fd_device) && !current_type[drive]))
3839 * This implements "read block 0" for floppy_revalidate().
3840 * Needed for format autodetection, checking whether there is
3841 * a disk in the drive, and whether that disk is writable.
3844 static int floppy_rb0_complete(struct bio *bio, unsigned int bytes_done,
3850 complete((struct completion *)bio->bi_private);
3854 static int __floppy_read_block_0(struct block_device *bdev)
3857 struct bio_vec bio_vec;
3858 struct completion complete;
3862 page = alloc_page(GFP_NOIO);
3864 process_fd_request();
3868 size = bdev->bd_block_size;
3873 bio.bi_io_vec = &bio_vec;
3874 bio_vec.bv_page = page;
3875 bio_vec.bv_len = size;
3876 bio_vec.bv_offset = 0;
3882 init_completion(&complete);
3883 bio.bi_private = &complete;
3884 bio.bi_end_io = floppy_rb0_complete;
3886 submit_bio(READ, &bio);
3887 generic_unplug_device(bdev_get_queue(bdev));
3888 process_fd_request();
3889 wait_for_completion(&complete);
3896 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3897 * the bootblock (block 0). "Autodetection" is also needed to check whether
3898 * there is a disk in the drive at all... Thus we also do it for fixed
3899 * geometry formats */
3900 static int floppy_revalidate(struct gendisk *disk)
3902 int drive = (long)disk->private_data;
3903 #define NO_GEOM (!current_type[drive] && !ITYPE(UDRS->fd_device))
3907 if (UTESTF(FD_DISK_CHANGED) ||
3908 UTESTF(FD_VERIFY) || test_bit(drive, &fake_change) || NO_GEOM) {
3909 if (usage_count == 0) {
3910 printk("VFS: revalidate called on non-open device.\n");
3914 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3915 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)) {
3916 process_fd_request(); /*already done by another thread */
3921 if (buffer_drive == drive)
3923 clear_bit(drive, &fake_change);
3924 UCLEARF(FD_DISK_CHANGED);
3929 res = __floppy_read_block_0(opened_bdev[drive]);
3932 poll_drive(0, FD_RAW_NEED_DISK);
3933 process_fd_request();
3936 set_capacity(disk, floppy_sizes[UDRS->fd_device]);
3940 static struct block_device_operations floppy_fops = {
3941 .owner = THIS_MODULE,
3942 .open = floppy_open,
3943 .release = floppy_release,
3945 .media_changed = check_floppy_change,
3946 .revalidate_disk = floppy_revalidate,
3948 static char *table[] = {
3949 "", "d360", "h1200", "u360", "u720", "h360", "h720",
3950 "u1440", "u2880", "CompaQ", "h1440", "u1680", "h410",
3951 "u820", "h1476", "u1722", "h420", "u830", "h1494", "u1743",
3952 "h880", "u1040", "u1120", "h1600", "u1760", "u1920",
3953 "u3200", "u3520", "u3840", "u1840", "u800", "u1600",
3956 static int t360[] = { 1, 0 },
3957 t1200[] = { 2, 5, 6, 10, 12, 14, 16, 18, 20, 23, 0 },
3958 t3in[] = { 8, 9, 26, 27, 28, 7, 11, 15, 19, 24, 25, 29, 31, 3, 4, 13,
3959 17, 21, 22, 30, 0 };
3960 static int *table_sup[] =
3961 { NULL, t360, t1200, t3in + 5 + 8, t3in + 5, t3in, t3in };
3963 static void __init register_devfs_entries(int drive)
3965 int base_minor = (drive < 4) ? drive : (124 + drive);
3967 if (UDP->cmos < NUMBER(default_drive_params)) {
3970 int minor = base_minor + (table_sup[UDP->cmos][i] << 2);
3972 devfs_mk_bdev(MKDEV(FLOPPY_MAJOR, minor),
3973 S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP |
3974 S_IWGRP, "floppy/%d%s", drive,
3975 table[table_sup[UDP->cmos][i]]);
3976 } while (table_sup[UDP->cmos][i++]);
3981 * Floppy Driver initialization
3982 * =============================
3985 /* Determine the floppy disk controller type */
3986 /* This routine was written by David C. Niemi */
3987 static char __init get_fdc_version(void)
3991 output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
3994 if ((r = result()) <= 0x00)
3995 return FDC_NONE; /* No FDC present ??? */
3996 if ((r == 1) && (reply_buffer[0] == 0x80)) {
3997 printk(KERN_INFO "FDC %d is an 8272A\n", fdc);
3998 return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
4002 ("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
4007 if (!fdc_configure()) {
4008 printk(KERN_INFO "FDC %d is an 82072\n", fdc);
4009 return FDC_82072; /* 82072 doesn't know CONFIGURE */
4012 output_byte(FD_PERPENDICULAR);
4013 if (need_more_output() == MORE_OUTPUT) {
4016 printk(KERN_INFO "FDC %d is an 82072A\n", fdc);
4017 return FDC_82072A; /* 82072A as found on Sparcs. */
4020 output_byte(FD_UNLOCK);
4022 if ((r == 1) && (reply_buffer[0] == 0x80)) {
4023 printk(KERN_INFO "FDC %d is a pre-1991 82077\n", fdc);
4024 return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
4027 if ((r != 1) || (reply_buffer[0] != 0x00)) {
4028 printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
4032 output_byte(FD_PARTID);
4035 printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
4039 if (reply_buffer[0] == 0x80) {
4040 printk(KERN_INFO "FDC %d is a post-1991 82077\n", fdc);
4041 return FDC_82077; /* Revised 82077AA passes all the tests */
4043 switch (reply_buffer[0] >> 5) {
4045 /* Either a 82078-1 or a 82078SL running at 5Volt */
4046 printk(KERN_INFO "FDC %d is an 82078.\n", fdc);
4049 printk(KERN_INFO "FDC %d is a 44pin 82078\n", fdc);
4052 printk(KERN_INFO "FDC %d is a S82078B\n", fdc);
4055 printk(KERN_INFO "FDC %d is a National Semiconductor PC87306\n",
4060 "FDC %d init: 82078 variant with unknown PARTID=%d.\n",
4061 fdc, reply_buffer[0] >> 5);
4062 return FDC_82078_UNKN;
4064 } /* get_fdc_version */
4066 /* lilo configuration */
4068 static void __init floppy_set_flags(int *ints, int param, int param2)
4072 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4074 default_drive_params[i].params.flags |= param2;
4076 default_drive_params[i].params.flags &= ~param2;
4078 DPRINT("%s flag 0x%x\n", param2 ? "Setting" : "Clearing", param);
4081 static void __init daring(int *ints, int param, int param2)
4085 for (i = 0; i < ARRAY_SIZE(default_drive_params); i++) {
4087 default_drive_params[i].params.select_delay = 0;
4088 default_drive_params[i].params.flags |=
4089 FD_SILENT_DCL_CLEAR;
4091 default_drive_params[i].params.select_delay =
4093 default_drive_params[i].params.flags &=
4094 ~FD_SILENT_DCL_CLEAR;
4097 DPRINT("Assuming %s floppy hardware\n", param ? "standard" : "broken");
4100 static void __init set_cmos(int *ints, int dummy, int dummy2)
4102 int current_drive = 0;
4105 DPRINT("wrong number of parameters for CMOS\n");
4108 current_drive = ints[1];
4109 if (current_drive < 0 || current_drive >= 8) {
4110 DPRINT("bad drive for set_cmos\n");
4114 if (current_drive >= 4 && !FDC2)
4118 DPRINT("setting CMOS code to %d\n", ints[2]);
4121 static struct param_table {
4123 void (*fn) (int *ints, int param, int param2);
4127 } config_params[] = {
4128 {"allowed_drive_mask", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4129 {"all_drives", NULL, &allowed_drive_mask, 0xff, 0}, /* obsolete */
4130 {"asus_pci", NULL, &allowed_drive_mask, 0x33, 0},
4131 {"irq", NULL, &FLOPPY_IRQ, 6, 0},
4132 {"dma", NULL, &FLOPPY_DMA, 2, 0},
4133 {"daring", daring, NULL, 1, 0},
4135 {"two_fdc", NULL, &FDC2, 0x370, 0},
4136 {"one_fdc", NULL, &FDC2, 0, 0},
4138 {"thinkpad", floppy_set_flags, NULL, 1, FD_INVERTED_DCL},
4139 {"broken_dcl", floppy_set_flags, NULL, 1, FD_BROKEN_DCL},
4140 {"messages", floppy_set_flags, NULL, 1, FTD_MSG},
4141 {"silent_dcl_clear", floppy_set_flags, NULL, 1, FD_SILENT_DCL_CLEAR},
4142 {"debug", floppy_set_flags, NULL, 1, FD_DEBUG},
4143 {"nodma", NULL, &can_use_virtual_dma, 1, 0},
4144 {"omnibook", NULL, &can_use_virtual_dma, 1, 0},
4145 {"yesdma", NULL, &can_use_virtual_dma, 0, 0},
4146 {"fifo_depth", NULL, &fifo_depth, 0xa, 0},
4147 {"nofifo", NULL, &no_fifo, 0x20, 0},
4148 {"usefifo", NULL, &no_fifo, 0, 0},
4149 {"cmos", set_cmos, NULL, 0, 0},
4150 {"slow", NULL, &slow_floppy, 1, 0},
4151 {"unexpected_interrupts", NULL, &print_unex, 1, 0},
4152 {"no_unexpected_interrupts", NULL, &print_unex, 0, 0},
4153 {"L40SX", NULL, &print_unex, 0, 0}
4158 static int __init floppy_setup(char *str)
4164 str = get_options(str, ARRAY_SIZE(ints), ints);
4166 for (i = 0; i < ARRAY_SIZE(config_params); i++) {
4167 if (strcmp(str, config_params[i].name) == 0) {
4171 param = config_params[i].def_param;
4172 if (config_params[i].fn)
4175 config_params[i].param2);
4176 if (config_params[i].var) {
4177 DPRINT("%s=%d\n", str, param);
4178 *config_params[i].var = param;
4185 DPRINT("unknown floppy option [%s]\n", str);
4187 DPRINT("allowed options are:");
4188 for (i = 0; i < ARRAY_SIZE(config_params); i++)
4189 printk(" %s", config_params[i].name);
4192 DPRINT("botched floppy option\n");
4193 DPRINT("Read Documentation/floppy.txt\n");
4197 static int have_no_fdc = -ENODEV;
4199 static void floppy_device_release(struct device *dev)
4201 complete(&device_release);
4204 static struct platform_device floppy_device = {
4208 .release = floppy_device_release,
4212 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
4214 int drive = (*part & 3) | ((*part & 0x80) >> 5);
4215 if (drive >= N_DRIVE ||
4216 !(allowed_drive_mask & (1 << drive)) ||
4217 fdc_state[FDC(drive)].version == FDC_NONE)
4219 if (((*part >> 2) & 0x1f) >= NUMBER(floppy_type))
4222 return get_disk(disks[drive]);
4225 int __init floppy_init(void)
4232 for (dr = 0; dr < N_DRIVE; dr++) {
4233 disks[dr] = alloc_disk(1);
4239 disks[dr]->major = FLOPPY_MAJOR;
4240 disks[dr]->first_minor = TOMINOR(dr);
4241 disks[dr]->fops = &floppy_fops;
4242 sprintf(disks[dr]->disk_name, "fd%d", dr);
4244 init_timer(&motor_off_timer[dr]);
4245 motor_off_timer[dr].data = dr;
4246 motor_off_timer[dr].function = motor_off_callback;
4249 devfs_mk_dir("floppy");
4251 err = register_blkdev(FLOPPY_MAJOR, "fd");
4253 goto out_devfs_remove;
4255 floppy_queue = blk_init_queue(do_fd_request, &floppy_lock);
4256 if (!floppy_queue) {
4258 goto out_unreg_blkdev;
4260 blk_queue_max_sectors(floppy_queue, 64);
4262 blk_register_region(MKDEV(FLOPPY_MAJOR, 0), 256, THIS_MODULE,
4263 floppy_find, NULL, NULL);
4265 for (i = 0; i < 256; i++)
4267 floppy_sizes[i] = floppy_type[ITYPE(i)].size;
4269 floppy_sizes[i] = MAX_DISK_SIZE << 1;
4271 reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
4274 for (i = 0; i < N_FDC; i++) {
4279 #if defined(__sparc__) || defined(__mc68000__)
4280 /*sparcs/sun3x don't have a DOR reset which we can fall back on to */
4284 FDCS->version = FDC_82072A;
4288 use_virtual_dma = can_use_virtual_dma & 1;
4289 fdc_state[0].address = FDC1;
4290 if (fdc_state[0].address == -1) {
4291 del_timer(&fd_timeout);
4293 goto out_unreg_region;
4296 fdc_state[1].address = FDC2;
4299 fdc = 0; /* reset fdc in case of unexpected interrupt */
4300 err = floppy_grab_irq_and_dma();
4302 del_timer(&fd_timeout);
4304 goto out_unreg_region;
4307 /* initialise drive state */
4308 for (drive = 0; drive < N_DRIVE; drive++) {
4311 USETF(FD_DISK_NEWCHANGE);
4312 USETF(FD_DISK_CHANGED);
4314 UDRS->fd_device = -1;
4315 floppy_track_buffer = NULL;
4316 max_buffer_sectors = 0;
4319 for (i = 0; i < N_FDC; i++) {
4321 FDCS->driver_version = FD_DRIVER_VERSION;
4322 for (unit = 0; unit < 4; unit++)
4323 FDCS->track[unit] = 0;
4324 if (FDCS->address == -1)
4327 if (user_reset_fdc(-1, FD_RESET_ALWAYS, 0)) {
4328 /* free ioports reserved by floppy_grab_irq_and_dma() */
4329 release_region(FDCS->address + 2, 4);
4330 release_region(FDCS->address + 7, 1);
4332 FDCS->version = FDC_NONE;
4335 /* Try to determine the floppy controller type */
4336 FDCS->version = get_fdc_version();
4337 if (FDCS->version == FDC_NONE) {
4338 /* free ioports reserved by floppy_grab_irq_and_dma() */
4339 release_region(FDCS->address + 2, 4);
4340 release_region(FDCS->address + 7, 1);
4344 if (can_use_virtual_dma == 2 && FDCS->version < FDC_82072A)
4345 can_use_virtual_dma = 0;
4348 /* Not all FDCs seem to be able to handle the version command
4349 * properly, so force a reset for the standard FDC clones,
4350 * to avoid interrupt garbage.
4352 user_reset_fdc(-1, FD_RESET_ALWAYS, 0);
4355 del_timer(&fd_timeout);
4357 floppy_release_irq_and_dma();
4360 DPRINT("no floppy controllers found\n");
4362 goto out_flush_work;
4365 for (drive = 0; drive < N_DRIVE; drive++) {
4366 if (!(allowed_drive_mask & (1 << drive)))
4368 if (fdc_state[FDC(drive)].version == FDC_NONE)
4370 /* to be cleaned up... */
4371 disks[drive]->private_data = (void *)(long)drive;
4372 disks[drive]->queue = floppy_queue;
4373 disks[drive]->flags |= GENHD_FL_REMOVABLE;
4374 add_disk(disks[drive]);
4377 err = platform_device_register(&floppy_device);
4384 for (drive = 0; drive < N_DRIVE; drive++) {
4385 if (!(allowed_drive_mask & (1 << drive)))
4387 if (fdc_state[FDC(drive)].version == FDC_NONE)
4389 del_gendisk(disks[drive]);
4392 flush_scheduled_work();
4394 floppy_release_irq_and_dma();
4396 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4397 blk_cleanup_queue(floppy_queue);
4399 unregister_blkdev(FLOPPY_MAJOR, "fd");
4401 devfs_remove("floppy");
4404 del_timer(&motor_off_timer[dr]);
4405 put_disk(disks[dr]);
4410 static spinlock_t floppy_usage_lock = SPIN_LOCK_UNLOCKED;
4412 static int floppy_grab_irq_and_dma(void)
4414 unsigned long flags;
4416 spin_lock_irqsave(&floppy_usage_lock, flags);
4417 if (usage_count++) {
4418 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4421 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4422 if (fd_request_irq()) {
4423 DPRINT("Unable to grab IRQ%d for the floppy driver\n",
4425 spin_lock_irqsave(&floppy_usage_lock, flags);
4427 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4430 if (fd_request_dma()) {
4431 DPRINT("Unable to grab DMA%d for the floppy driver\n",
4434 spin_lock_irqsave(&floppy_usage_lock, flags);
4436 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4440 for (fdc = 0; fdc < N_FDC; fdc++) {
4441 if (FDCS->address != -1) {
4442 if (!request_region(FDCS->address + 2, 4, "floppy")) {
4443 DPRINT("Floppy io-port 0x%04lx in use\n",
4447 if (!request_region(FDCS->address + 7, 1, "floppy DIR")) {
4448 DPRINT("Floppy io-port 0x%04lx in use\n",
4452 /* address + 6 is reserved, and may be taken by IDE.
4453 * Unfortunately, Adaptec doesn't know this :-(, */
4456 for (fdc = 0; fdc < N_FDC; fdc++) {
4457 if (FDCS->address != -1) {
4459 fd_outb(FDCS->dor, FD_DOR);
4463 set_dor(0, ~0, 8); /* avoid immediate interrupt */
4465 for (fdc = 0; fdc < N_FDC; fdc++)
4466 if (FDCS->address != -1)
4467 fd_outb(FDCS->dor, FD_DOR);
4469 * The driver will try and free resources and relies on us
4470 * to know if they were allocated or not.
4473 irqdma_allocated = 1;
4476 release_region(FDCS->address + 2, 4);
4480 while (--fdc >= 0) {
4481 release_region(FDCS->address + 2, 4);
4482 release_region(FDCS->address + 7, 1);
4484 spin_lock_irqsave(&floppy_usage_lock, flags);
4486 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4490 static void floppy_release_irq_and_dma(void)
4493 #ifdef FLOPPY_SANITY_CHECK
4499 unsigned long tmpaddr;
4500 unsigned long flags;
4502 spin_lock_irqsave(&floppy_usage_lock, flags);
4503 if (--usage_count) {
4504 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4507 spin_unlock_irqrestore(&floppy_usage_lock, flags);
4508 if (irqdma_allocated) {
4512 irqdma_allocated = 0;
4518 floppy_enable_hlt();
4520 if (floppy_track_buffer && max_buffer_sectors) {
4521 tmpsize = max_buffer_sectors * 1024;
4522 tmpaddr = (unsigned long)floppy_track_buffer;
4523 floppy_track_buffer = NULL;
4524 max_buffer_sectors = 0;
4525 buffer_min = buffer_max = -1;
4526 fd_dma_mem_free(tmpaddr, tmpsize);
4528 #ifdef FLOPPY_SANITY_CHECK
4530 for (drive = 0; drive < N_FDC * 4; drive++)
4531 if (timer_pending(motor_off_timer + drive))
4532 printk("motor off timer %d still active\n", drive);
4535 if (timer_pending(&fd_timeout))
4536 printk("floppy timer still active:%s\n", timeout_message);
4537 if (timer_pending(&fd_timer))
4538 printk("auxiliary floppy timer still active\n");
4539 if (floppy_work.pending)
4540 printk("work still pending\n");
4543 for (fdc = 0; fdc < N_FDC; fdc++)
4544 if (FDCS->address != -1) {
4545 release_region(FDCS->address + 2, 4);
4546 release_region(FDCS->address + 7, 1);
4555 static void unregister_devfs_entries(int drive)
4559 if (UDP->cmos < NUMBER(default_drive_params)) {
4562 devfs_remove("floppy/%d%s", drive,
4563 table[table_sup[UDP->cmos][i]]);
4564 } while (table_sup[UDP->cmos][i++]);
4568 static void __init parse_floppy_cfg_string(char *cfg)
4573 for (ptr = cfg; *cfg && *cfg != ' ' && *cfg != '\t'; cfg++) ;
4583 int init_module(void)
4585 printk(KERN_INFO "inserting floppy driver for " UTS_RELEASE "\n");
4588 parse_floppy_cfg_string(floppy);
4589 return floppy_init();
4592 void cleanup_module(void)
4596 init_completion(&device_release);
4597 platform_device_unregister(&floppy_device);
4598 blk_unregister_region(MKDEV(FLOPPY_MAJOR, 0), 256);
4599 unregister_blkdev(FLOPPY_MAJOR, "fd");
4601 for (drive = 0; drive < N_DRIVE; drive++) {
4602 del_timer_sync(&motor_off_timer[drive]);
4604 if ((allowed_drive_mask & (1 << drive)) &&
4605 fdc_state[FDC(drive)].version != FDC_NONE) {
4606 del_gendisk(disks[drive]);
4607 unregister_devfs_entries(drive);
4609 put_disk(disks[drive]);
4611 devfs_remove("floppy");
4613 del_timer_sync(&fd_timeout);
4614 del_timer_sync(&fd_timer);
4615 blk_cleanup_queue(floppy_queue);
4618 floppy_release_irq_and_dma();
4620 /* eject disk, if any */
4623 wait_for_completion(&device_release);
4626 MODULE_PARM(floppy, "s");
4627 MODULE_PARM(FLOPPY_IRQ, "i");
4628 MODULE_PARM(FLOPPY_DMA, "i");
4629 MODULE_AUTHOR("Alain L. Knaff");
4630 MODULE_SUPPORTED_DEVICE("fd");
4631 MODULE_LICENSE("GPL");
4635 __setup("floppy=", floppy_setup);
4636 module_init(floppy_init)
4639 MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);