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1.1 root 1: /*
2: * linux/kernel/floppy.c
3: *
4: * (C) 1991 Linus Torvalds
5: */
6:
7: /*
1.1.1.2 root 8: * 02.12.91 - Changed to static variables to indicate need for reset
9: * and recalibrate. This makes some things easier (output_byte reset
10: * checking etc), and means less interrupt jumping in case of errors,
11: * so the code is hopefully easier to understand.
12: */
13:
14: /*
15: * This file is certainly a mess. I've tried my best to get it working,
16: * but I don't like programming floppies, and I have only one anyway.
17: * Urgel. I should check for more errors, and do more graceful error
18: * recovery. Seems there are problems with several drives. I've tried to
19: * correct them. No promises.
20: */
21:
22: /*
1.1 root 23: * As with hd.c, all routines within this file can (and will) be called
24: * by interrupts, so extreme caution is needed. A hardware interrupt
25: * handler may not sleep, or a kernel panic will happen. Thus I cannot
26: * call "floppy-on" directly, but have to set a special timer interrupt
27: * etc.
1.1.1.4 root 28: */
29:
30: /*
31: * 28.02.92 - made track-buffering routines, based on the routines written
32: * by [email protected] (Lawrence Foard). Linus.
1.1 root 33: */
34:
1.1.1.7 root 35: /*
36: * Automatic floppy-detection and formatting written by Werner Almesberger
37: * ([email protected]), who also corrected some problems with
1.1.1.8 root 38: * the floppy-change signal detection.
1.1.1.7 root 39: */
40:
1.1 root 41: #include <linux/sched.h>
42: #include <linux/fs.h>
43: #include <linux/kernel.h>
1.1.1.7 root 44: #include <linux/timer.h>
1.1 root 45: #include <linux/fdreg.h>
1.1.1.7 root 46: #include <linux/fd.h>
1.1 root 47: #include <asm/system.h>
48: #include <asm/io.h>
49: #include <asm/segment.h>
1.1.1.7 root 50: #include <errno.h>
1.1 root 51:
52: #define MAJOR_NR 2
53: #include "blk.h"
54:
1.1.1.7 root 55: static unsigned int changed_floppies = 0, fake_change = 0;
1.1.1.5 root 56:
1.1.1.2 root 57: static int recalibrate = 0;
58: static int reset = 0;
1.1.1.7 root 59: static int recover = 0; /* recalibrate immediately after resetting */
1.1.1.2 root 60: static int seek = 0;
1.1 root 61:
62: extern unsigned char current_DOR;
63:
64: #define immoutb_p(val,port) \
65: __asm__("outb %0,%1\n\tjmp 1f\n1:\tjmp 1f\n1:"::"a" ((char) (val)),"i" (port))
66:
67: #define TYPE(x) ((x)>>2)
68: #define DRIVE(x) ((x)&0x03)
69: /*
1.1.1.4 root 70: * Note that MAX_ERRORS=X doesn't imply that we retry every bad read
1.1.1.5 root 71: * max X times - some types of errors increase the errorcount by 2 or
72: * even 3, so we might actually retry only X/2 times before giving up.
1.1 root 73: */
1.1.1.4 root 74: #define MAX_ERRORS 12
1.1 root 75:
76: /*
1.1.1.7 root 77: * Maximum disk size (in kilobytes). This default is used whenever the
78: * current disk size is unknown.
79: */
80:
81: #define MAX_DISK_SIZE 1440
82:
83: /*
84: * Maximum number of sectors in a track buffer. Track buffering is disabled
85: * if tracks are bigger.
86: */
87:
88: #define MAX_BUFFER_SECTORS 18
89:
90: /*
1.1 root 91: * globals used by 'result()'
92: */
93: #define MAX_REPLIES 7
94: static unsigned char reply_buffer[MAX_REPLIES];
95: #define ST0 (reply_buffer[0])
96: #define ST1 (reply_buffer[1])
97: #define ST2 (reply_buffer[2])
98: #define ST3 (reply_buffer[3])
99:
100: /*
101: * This struct defines the different floppy types. Unlike minix
102: * linux doesn't have a "search for right type"-type, as the code
1.1.1.2 root 103: * for that is convoluted and weird. I've got enough problems with
104: * this driver as it is.
1.1 root 105: *
106: * The 'stretch' tells if the tracks need to be boubled for some
107: * types (ie 360kB diskette in 1.2MB drive etc). Others should
108: * be self-explanatory.
109: */
1.1.1.4 root 110:
111: static struct floppy_struct floppy_type[] = {
1.1.1.7 root 112: { 0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL }, /* no testing */
113: { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,NULL }, /* 360kB PC diskettes */
114: { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,NULL }, /* 1.2 MB AT-diskettes */
115: { 720, 9,2,40,1,0x2A,0x02,0xDF,0x50,NULL }, /* 360kB in 720kB drive */
116: { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,NULL }, /* 3.5" 720kB diskette */
117: { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,NULL }, /* 360kB in 1.2MB drive */
118: { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,NULL }, /* 720kB in 1.2MB drive */
119: { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,NULL }, /* 1.44MB diskette */
120: };
121:
122: /* For auto-detection. Each drive type has a pair of formats to try. */
123:
124: static struct floppy_struct floppy_types[] = {
125: { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"360k/PC" }, /* 360kB PC diskettes */
126: { 720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"360k/PC" }, /* 360kB PC diskettes */
127: { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"1.2M" }, /* 1.2 MB AT-diskettes */
128: { 720, 9,2,40,1,0x23,0x01,0xDF,0x50,"360k/AT" }, /* 360kB in 1.2MB drive */
129: { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"720k" }, /* 3.5" 720kB diskette */
130: { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"720k" }, /* 3.5" 720kB diskette */
131: { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"1.44M" }, /* 1.44MB diskette */
132: { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"720k/AT" }, /* 3.5" 720kB diskette */
133: };
134:
135: /* Auto-detection: Disk type used until the next media change occurs. */
136:
137: struct floppy_struct *current_type[4] = { NULL, NULL, NULL, NULL };
138:
139: /* This type is tried first. */
140:
141: struct floppy_struct *base_type[4];
142:
143: /* User-provided type information. current_type points to the respective entry
144: of this array. */
145:
146: struct floppy_struct user_params[4];
147:
148: static int floppy_sizes[] ={
149: MAX_DISK_SIZE, MAX_DISK_SIZE, MAX_DISK_SIZE, MAX_DISK_SIZE,
150: 360, 360 ,360, 360,
151: 1200,1200,1200,1200,
152: 360, 360, 360, 360,
153: 720, 720, 720, 720,
154: 360, 360, 360, 360,
155: 720, 720, 720, 720,
156: 1440,1440,1440,1440
1.1 root 157: };
1.1.1.3 root 158:
1.1.1.7 root 159: /* The driver is trying to determine the correct media format while probing
160: is set. rw_interrupts clears it after a successful access. */
161:
162: static int probing = 0;
163:
164: /* (User-provided) media information is _not_ discarded after a media change
165: if the corresponding keep_data flag is non-zero. Positive values are
166: decremented after each probe. */
167:
168: static int keep_data[4] = { 0,0,0,0 };
169:
170: /* Announce successful media type detection and media information loss after
171: disk changes. */
172:
173: static ftd_msg[4] = { 1,1,1,1 };
174:
175: /* Synchronization of FDC access. */
176:
177: static volatile int format_status = FORMAT_NONE, fdc_busy = 0;
178: static struct task_struct *fdc_wait = NULL, *format_done = NULL;
179:
180: /* Errors during formatting are counted here. */
181:
182: static int format_errors;
183:
184: /* Format request descriptor. */
185:
186: static struct format_descr format_req;
187:
188: /* Current device number. Taken either from the block header or from the
189: format request descriptor. */
190:
191: #define CURRENT_DEVICE (format_status == FORMAT_BUSY ? format_req.device : \
192: (CURRENT->dev))
193:
194: /* Current error count. */
195:
196: #define CURRENT_ERRORS (format_status == FORMAT_BUSY ? format_errors : \
197: (CURRENT->errors))
198:
1.1 root 199: /*
200: * Rate is 0 for 500kb/s, 2 for 300kbps, 1 for 250kbps
201: * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
202: * H is head unload time (1=16ms, 2=32ms, etc)
203: *
204: * Spec2 is (HLD<<1 | ND), where HLD is head load time (1=2ms, 2=4 ms etc)
205: * and ND is set means no DMA. Hardcoded to 6 (HLD=6ms, use DMA).
206: */
207:
208: extern void floppy_interrupt(void);
209: extern char tmp_floppy_area[1024];
1.1.1.7 root 210: extern char floppy_track_buffer[512*2*MAX_BUFFER_SECTORS];
211:
212: static void redo_fd_request(void);
1.1 root 213:
214: /*
215: * These are global variables, as that's the easiest way to give
216: * information to interrupts. They are the data used for the current
217: * request.
218: */
1.1.1.5 root 219: #define NO_TRACK 255
220:
1.1.1.4 root 221: static int read_track = 0; /* flag to indicate if we want to read all track */
222: static int buffer_track = -1;
223: static int buffer_drive = -1;
1.1 root 224: static int cur_spec1 = -1;
225: static int cur_rate = -1;
226: static struct floppy_struct * floppy = floppy_type;
1.1.1.5 root 227: static unsigned char current_drive = 255;
1.1 root 228: static unsigned char sector = 0;
229: static unsigned char head = 0;
230: static unsigned char track = 0;
231: static unsigned char seek_track = 0;
1.1.1.5 root 232: static unsigned char current_track = NO_TRACK;
1.1 root 233: static unsigned char command = 0;
1.1.1.2 root 234: unsigned char selected = 0;
235: struct task_struct * wait_on_floppy_select = NULL;
236:
237: void floppy_deselect(unsigned int nr)
238: {
239: if (nr != (current_DOR & 3))
240: printk("floppy_deselect: drive not selected\n\r");
241: selected = 0;
242: wake_up(&wait_on_floppy_select);
243: }
1.1 root 244:
1.1.1.7 root 245: void request_done(int uptodate)
246: {
247: timer_active &= ~(1 << FLOPPY_TIMER);
248: if (format_status != FORMAT_BUSY) end_request(uptodate);
249: else {
250: format_status = uptodate ? FORMAT_OKAY : FORMAT_ERROR;
251: wake_up(&format_done);
252: }
253: }
254:
1.1 root 255: /*
256: * floppy-change is never called from an interrupt, so we can relax a bit
1.1.1.2 root 257: * here, sleep etc. Note that floppy-on tries to set current_DOR to point
258: * to the desired drive, but it will probably not survive the sleep if
259: * several floppies are used at the same time: thus the loop.
1.1 root 260: */
1.1.1.5 root 261: int floppy_change(struct buffer_head * bh)
1.1 root 262: {
1.1.1.5 root 263: unsigned int mask = 1 << (bh->b_dev & 0x03);
264:
265: if (MAJOR(bh->b_dev) != 2) {
1.1.1.7 root 266: printk("floppy_changed: not a floppy\r\n");
1.1.1.5 root 267: return 0;
268: }
1.1.1.7 root 269: if (fake_change & mask) {
270: fake_change &= ~mask;
271: /* omitting the next line breaks formatting in a horrible way ... */
272: changed_floppies &= ~mask;
273: return 1;
274: }
1.1.1.5 root 275: if (changed_floppies & mask) {
276: changed_floppies &= ~mask;
277: recalibrate = 1;
1.1 root 278: return 1;
279: }
1.1.1.5 root 280: if (!bh)
281: return 0;
282: if (bh->b_dirt)
283: ll_rw_block(WRITE,bh);
284: else {
285: buffer_track = -1;
286: bh->b_uptodate = 0;
287: ll_rw_block(READ,bh);
288: }
289: cli();
290: while (bh->b_lock)
291: sleep_on(&bh->b_wait);
292: sti();
293: if (changed_floppies & mask) {
294: changed_floppies &= ~mask;
295: recalibrate = 1;
296: return 1;
1.1.1.7 root 297: }
1.1 root 298: return 0;
299: }
300:
301: #define copy_buffer(from,to) \
302: __asm__("cld ; rep ; movsl" \
303: ::"c" (BLOCK_SIZE/4),"S" ((long)(from)),"D" ((long)(to)) \
304: :"cx","di","si")
305:
306: static void setup_DMA(void)
307: {
1.1.1.7 root 308: unsigned long addr,count;
1.1 root 309:
1.1.1.7 root 310: if (command == FD_FORMAT) {
311: addr = (long) tmp_floppy_area;
312: count = floppy->sect*4;
313: }
314: else {
315: addr = (long) CURRENT->buffer;
316: count = 1024;
317: }
1.1.1.4 root 318: if (read_track) {
319: /* mark buffer-track bad, in case all this fails.. */
320: buffer_drive = buffer_track = -1;
321: count = floppy->sect*2*512;
322: addr = (long) floppy_track_buffer;
323: } else if (addr >= 0x100000) {
1.1 root 324: addr = (long) tmp_floppy_area;
325: if (command == FD_WRITE)
326: copy_buffer(CURRENT->buffer,tmp_floppy_area);
327: }
328: /* mask DMA 2 */
1.1.1.7 root 329: cli();
1.1 root 330: immoutb_p(4|2,10);
331: /* output command byte. I don't know why, but everyone (minix, */
332: /* sanches & canton) output this twice, first to 12 then to 11 */
333: __asm__("outb %%al,$12\n\tjmp 1f\n1:\tjmp 1f\n1:\t"
334: "outb %%al,$11\n\tjmp 1f\n1:\tjmp 1f\n1:"::
335: "a" ((char) ((command == FD_READ)?DMA_READ:DMA_WRITE)));
336: /* 8 low bits of addr */
337: immoutb_p(addr,4);
338: addr >>= 8;
339: /* bits 8-15 of addr */
340: immoutb_p(addr,4);
341: addr >>= 8;
342: /* bits 16-19 of addr */
343: immoutb_p(addr,0x81);
1.1.1.4 root 344: /* low 8 bits of count-1 */
345: count--;
346: immoutb_p(count,5);
347: count >>= 8;
1.1 root 348: /* high 8 bits of count-1 */
1.1.1.4 root 349: immoutb_p(count,5);
1.1 root 350: /* activate DMA 2 */
351: immoutb_p(0|2,10);
1.1.1.2 root 352: sti();
1.1 root 353: }
354:
355: static void output_byte(char byte)
356: {
357: int counter;
358: unsigned char status;
359:
1.1.1.2 root 360: if (reset)
361: return;
1.1 root 362: for(counter = 0 ; counter < 10000 ; counter++) {
1.1.1.2 root 363: status = inb_p(FD_STATUS) & (STATUS_READY | STATUS_DIR);
1.1 root 364: if (status == STATUS_READY) {
365: outb(byte,FD_DATA);
366: return;
367: }
368: }
1.1.1.5 root 369: current_track = NO_TRACK;
1.1.1.2 root 370: reset = 1;
1.1 root 371: printk("Unable to send byte to FDC\n\r");
372: }
373:
374: static int result(void)
375: {
376: int i = 0, counter, status;
377:
1.1.1.2 root 378: if (reset)
379: return -1;
1.1 root 380: for (counter = 0 ; counter < 10000 ; counter++) {
1.1.1.2 root 381: status = inb_p(FD_STATUS)&(STATUS_DIR|STATUS_READY|STATUS_BUSY);
1.1 root 382: if (status == STATUS_READY)
383: return i;
384: if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
385: if (i >= MAX_REPLIES)
386: break;
1.1.1.2 root 387: reply_buffer[i++] = inb_p(FD_DATA);
1.1 root 388: }
389: }
1.1.1.2 root 390: reset = 1;
1.1.1.5 root 391: current_track = NO_TRACK;
1.1 root 392: printk("Getstatus times out\n\r");
393: return -1;
394: }
395:
1.1.1.2 root 396: static void bad_flp_intr(void)
397: {
1.1.1.5 root 398: current_track = NO_TRACK;
1.1.1.7 root 399: CURRENT_ERRORS++;
400: if (CURRENT_ERRORS > MAX_ERRORS) {
1.1.1.2 root 401: floppy_deselect(current_drive);
1.1.1.7 root 402: request_done(0);
1.1.1.2 root 403: }
1.1.1.7 root 404: if (CURRENT_ERRORS > MAX_ERRORS/2)
1.1.1.2 root 405: reset = 1;
1.1.1.5 root 406: else
407: recalibrate = 1;
1.1.1.2 root 408: }
409:
1.1 root 410: /*
1.1.1.2 root 411: * Ok, this interrupt is called after a DMA read/write has succeeded,
412: * so we check the results, and copy any buffers.
1.1 root 413: */
1.1.1.2 root 414: static void rw_interrupt(void)
1.1 root 415: {
1.1.1.4 root 416: char * buffer_area;
417:
1.1.1.2 root 418: if (result() != 7 || (ST0 & 0xf8) || (ST1 & 0xbf) || (ST2 & 0x73)) {
419: if (ST1 & 0x02) {
420: printk("Drive %d is write protected\n\r",current_drive);
1.1 root 421: floppy_deselect(current_drive);
1.1.1.7 root 422: request_done(0);
1.1.1.2 root 423: } else
424: bad_flp_intr();
1.1.1.7 root 425: redo_fd_request();
1.1 root 426: return;
427: }
1.1.1.7 root 428: if (probing) {
429: int drive = MINOR(CURRENT->dev);
430:
431: if (ftd_msg[drive])
432: printk("Auto-detected floppy type %s in fd%d\r\n",
433: floppy->name,drive);
434: current_type[drive] = floppy;
435: floppy_sizes[drive] = floppy->size >> 1;
436: probing = 0;
437: }
1.1.1.4 root 438: if (read_track) {
439: buffer_track = seek_track;
440: buffer_drive = current_drive;
441: buffer_area = floppy_track_buffer +
442: ((sector-1 + head*floppy->sect)<<9);
443: copy_buffer(buffer_area,CURRENT->buffer);
444: } else if (command == FD_READ &&
445: (unsigned long)(CURRENT->buffer) >= 0x100000)
1.1.1.2 root 446: copy_buffer(tmp_floppy_area,CURRENT->buffer);
447: floppy_deselect(current_drive);
1.1.1.7 root 448: request_done(1);
449: redo_fd_request();
1.1.1.2 root 450: }
451:
1.1.1.4 root 452: /*
453: * We try to read tracks, but if we get too many errors, we
454: * go back to reading just one sector at a time.
455: *
456: * This means we should be able to read a sector even if there
457: * are other bad sectors on this track.
458: */
1.1.1.2 root 459: inline void setup_rw_floppy(void)
460: {
1.1 root 461: setup_DMA();
462: do_floppy = rw_interrupt;
463: output_byte(command);
1.1.1.7 root 464: if (command != FD_FORMAT) {
465: if (read_track) {
466: output_byte(current_drive);
467: output_byte(track);
468: output_byte(0);
469: output_byte(1);
470: } else {
471: output_byte(head<<2 | current_drive);
472: output_byte(track);
473: output_byte(head);
474: output_byte(sector);
475: }
476: output_byte(2); /* sector size = 512 */
477: output_byte(floppy->sect);
478: output_byte(floppy->gap);
479: output_byte(0xFF); /* sector size (0xff when n!=0 ?) */
1.1.1.4 root 480: } else {
481: output_byte(head<<2 | current_drive);
1.1.1.7 root 482: output_byte(2);
483: output_byte(floppy->sect);
484: output_byte(floppy->fmt_gap);
485: output_byte(FD_FILL_BYTE);
486: }
1.1.1.2 root 487: if (reset)
1.1.1.7 root 488: redo_fd_request();
1.1 root 489: }
490:
491: /*
1.1.1.2 root 492: * This is the routine called after every seek (or recalibrate) interrupt
493: * from the floppy controller. Note that the "unexpected interrupt" routine
494: * also does a recalibrate, but doesn't come here.
1.1 root 495: */
1.1.1.2 root 496: static void seek_interrupt(void)
1.1 root 497: {
1.1.1.2 root 498: /* sense drive status */
499: output_byte(FD_SENSEI);
500: if (result() != 2 || (ST0 & 0xF8) != 0x20 || ST1 != seek_track) {
1.1.1.4 root 501: recalibrate = 1;
1.1.1.2 root 502: bad_flp_intr();
1.1.1.7 root 503: redo_fd_request();
1.1 root 504: return;
505: }
1.1.1.2 root 506: current_track = ST1;
507: setup_rw_floppy();
1.1 root 508: }
509:
510: /*
511: * This routine is called when everything should be correctly set up
512: * for the transfer (ie floppy motor is on and the correct floppy is
513: * selected).
514: */
515: static void transfer(void)
516: {
1.1.1.7 root 517: read_track = (command == FD_READ) && (CURRENT_ERRORS < 4) &&
518: (floppy->sect <= MAX_BUFFER_SECTORS);
1.1 root 519: if (cur_spec1 != floppy->spec1) {
520: cur_spec1 = floppy->spec1;
521: output_byte(FD_SPECIFY);
522: output_byte(cur_spec1); /* hut etc */
523: output_byte(6); /* Head load time =6ms, DMA */
524: }
525: if (cur_rate != floppy->rate)
526: outb_p(cur_rate = floppy->rate,FD_DCR);
1.1.1.2 root 527: if (reset) {
1.1.1.7 root 528: redo_fd_request();
1.1.1.2 root 529: return;
530: }
531: if (!seek) {
532: setup_rw_floppy();
533: return;
534: }
1.1 root 535: do_floppy = seek_interrupt;
1.1.1.4 root 536: output_byte(FD_SEEK);
537: if (read_track)
538: output_byte(current_drive);
539: else
540: output_byte((head<<2) | current_drive);
541: output_byte(seek_track);
1.1.1.2 root 542: if (reset)
1.1.1.7 root 543: redo_fd_request();
1.1 root 544: }
545:
546: /*
547: * Special case - used after a unexpected interrupt (or reset)
548: */
1.1.1.7 root 549:
550: static void recalibrate_floppy();
551:
1.1 root 552: static void recal_interrupt(void)
553: {
554: output_byte(FD_SENSEI);
1.1.1.5 root 555: current_track = NO_TRACK;
1.1.1.2 root 556: if (result()!=2 || (ST0 & 0xE0) == 0x60)
557: reset = 1;
1.1.1.7 root 558: /* Recalibrate until track 0 is reached. Might help on some errors. */
559: if ((ST0 & 0x10) == 0x10) recalibrate_floppy();
560: else redo_fd_request();
1.1 root 561: }
562:
563: void unexpected_floppy_interrupt(void)
564: {
1.1.1.5 root 565: current_track = NO_TRACK;
1.1 root 566: output_byte(FD_SENSEI);
1.1.1.2 root 567: if (result()!=2 || (ST0 & 0xE0) == 0x60)
568: reset = 1;
569: else
570: recalibrate = 1;
571: }
572:
573: static void recalibrate_floppy(void)
574: {
575: recalibrate = 0;
576: current_track = 0;
1.1 root 577: do_floppy = recal_interrupt;
578: output_byte(FD_RECALIBRATE);
579: output_byte(head<<2 | current_drive);
1.1.1.2 root 580: if (reset)
1.1.1.7 root 581: redo_fd_request();
1.1 root 582: }
583:
584: static void reset_interrupt(void)
585: {
586: output_byte(FD_SENSEI);
587: (void) result();
1.1.1.2 root 588: output_byte(FD_SPECIFY);
589: output_byte(cur_spec1); /* hut etc */
590: output_byte(6); /* Head load time =6ms, DMA */
1.1.1.7 root 591: if (!recover) redo_fd_request();
592: else {
593: recalibrate_floppy();
594: recover = 0;
595: }
1.1 root 596: }
597:
1.1.1.2 root 598: /*
599: * reset is done by pulling bit 2 of DOR low for a while.
600: */
1.1 root 601: static void reset_floppy(void)
602: {
1.1.1.2 root 603: int i;
604:
1.1.1.5 root 605: do_floppy = reset_interrupt;
1.1.1.2 root 606: reset = 0;
1.1.1.5 root 607: current_track = NO_TRACK;
1.1.1.2 root 608: cur_spec1 = -1;
609: cur_rate = -1;
610: recalibrate = 1;
1.1 root 611: printk("Reset-floppy called\n\r");
1.1.1.2 root 612: cli();
613: outb_p(current_DOR & ~0x04,FD_DOR);
1.1.1.5 root 614: for (i=0 ; i<1000 ; i++)
1.1.1.2 root 615: __asm__("nop");
1.1 root 616: outb(current_DOR,FD_DOR);
1.1.1.2 root 617: sti();
1.1 root 618: }
619:
1.1.1.7 root 620: static void floppy_shutdown(void)
621: {
622: cli();
623: request_done(0);
624: recover = 1;
625: reset_floppy();
626: sti();
627: }
628:
629: static void shake_done(void)
630: {
631: current_track = NO_TRACK;
632: if (inb(FD_DIR) & 0x80) request_done(0);
633: redo_fd_request();
634: }
635:
636: static int retry_recal(void (*proc)(void))
637: {
638: output_byte(FD_SENSEI);
639: if (result() == 2 && (ST0 & 0x10) != 0x10) return 0;
640: do_floppy = proc;
641: output_byte(FD_RECALIBRATE);
642: output_byte(head<<2 | current_drive);
643: return 1;
644: }
645:
646: static void shake_zero(void)
647: {
648: if (!retry_recal(shake_zero)) shake_done();
649: }
650:
651: static void shake_one(void)
652: {
653: if (retry_recal(shake_one)) return;
654: do_floppy = shake_done;
655: output_byte(FD_SEEK);
656: output_byte(head << 2 | current_drive);
657: output_byte(1);
658: }
659:
1.1 root 660: static void floppy_on_interrupt(void)
661: {
1.1.1.5 root 662: if (inb(FD_DIR) & 0x80) {
663: changed_floppies |= 1<<current_drive;
664: buffer_track = -1;
1.1.1.7 root 665: if (keep_data[current_drive]) {
666: if (keep_data[current_drive] > 0)
667: keep_data[current_drive]--;
668: }
669: else {
670: if (ftd_msg[current_drive] && current_type[
671: current_drive] != NULL)
672: printk("Disk type is undefined after disk "
673: "change in fd%d\r\n",current_drive);
674: current_type[current_drive] = NULL;
675: floppy_sizes[current_drive] = MAX_DISK_SIZE;
676: }
677: /* Forcing the drive to seek makes the "media changed" condition go away.
678: There should be a cleaner solution for that ... */
679: if (!reset && !recalibrate) {
680: do_floppy = (current_track && current_track != NO_TRACK)
681: ? shake_zero : shake_one;
682: output_byte(FD_RECALIBRATE);
683: output_byte(head<<2 | current_drive);
684: return;
685: }
1.1.1.5 root 686: }
687: if (reset) {
688: reset_floppy();
689: return;
690: }
691: if (recalibrate) {
692: recalibrate_floppy();
693: return;
694: }
1.1 root 695: /* We cannot do a floppy-select, as that might sleep. We just force it */
696: selected = 1;
1.1.1.2 root 697: if (current_drive != (current_DOR & 3)) {
1.1.1.6 root 698: seek = 1;
699: current_track = NO_TRACK;
1.1.1.2 root 700: current_DOR &= 0xFC;
701: current_DOR |= current_drive;
702: outb(current_DOR,FD_DOR);
703: add_timer(2,&transfer);
704: } else
705: transfer();
1.1 root 706: }
707:
1.1.1.7 root 708: static void setup_format_params(void)
709: {
710: unsigned char *here = (unsigned char *) tmp_floppy_area;
711: int count;
712:
713: for (count = 1; count <= floppy->sect; count++) {
714: *here++ = track;
715: *here++ = head;
716: *here++ = count;
717: *here++ = 2; /* 512 bytes */
718: }
719: }
720:
721: static void redo_fd_request(void)
1.1 root 722: {
723: unsigned int block;
1.1.1.4 root 724: char * buffer_area;
1.1.1.7 root 725: int device;
1.1 root 726:
1.1.1.7 root 727: repeat:
728: if (format_status == FORMAT_WAIT) format_status = FORMAT_BUSY;
729: if (format_status != FORMAT_BUSY) {
730: if (!CURRENT) {
731: if (!fdc_busy) panic("FDC access conflict");
732: fdc_busy = 0;
733: wake_up(&fdc_wait);
734: CLEAR_INTR;
735: return;
736: }
737: if (MAJOR(CURRENT->dev) != MAJOR_NR)
738: panic(DEVICE_NAME ": request list destroyed"); \
739: if (CURRENT->bh) {
740: if (!CURRENT->bh->b_lock)
741: panic(DEVICE_NAME ": block not locked");
742: }
743: }
1.1.1.5 root 744: seek = 0;
1.1.1.7 root 745: probing = 0;
746: device = MINOR(CURRENT_DEVICE);
747: if (device > 3)
748: floppy = (device >> 2) + floppy_type;
749: else { /* Auto-detection */
750: if ((floppy = current_type[device & 3]) == NULL) {
751: probing = 1;
752: if ((floppy = base_type[device & 3]) ==
753: NULL) {
754: request_done(0);
755: goto repeat;
756: }
757: floppy += CURRENT_ERRORS & 1;
758: }
759: }
760: if (format_status != FORMAT_BUSY) {
761: if (current_drive != CURRENT_DEV)
762: current_track = NO_TRACK;
763: current_drive = CURRENT_DEV;
764: block = CURRENT->sector;
765: if (block+2 > floppy->size) {
766: request_done(0);
767: goto repeat;
768: }
769: sector = block % floppy->sect;
770: block /= floppy->sect;
771: head = block % floppy->head;
772: track = block / floppy->head;
773: seek_track = track << floppy->stretch;
774: if (CURRENT->cmd == READ)
775: command = FD_READ;
776: else if (CURRENT->cmd == WRITE)
777: command = FD_WRITE;
778: else {
779: printk("do_fd_request: unknown command\n");
780: request_done(0);
781: goto repeat;
782: }
783: }
1.1.1.4 root 784: else {
1.1.1.7 root 785: if (current_drive != (format_req.device & 3))
786: current_track = NO_TRACK;
787: current_drive = format_req.device & 3;
1.1.1.9 ! root 788: if (((unsigned) format_req.track) >= floppy->track ||
1.1.1.7 root 789: (format_req.head & 0xfffe) || probing) {
790: request_done(0);
791: goto repeat;
792: }
793: head = format_req.head;
794: track = format_req.track;
795: seek_track = track << floppy->stretch;
796: if (seek_track == buffer_track) buffer_track = -1;
797: command = FD_FORMAT;
798: setup_format_params();
1.1.1.4 root 799: }
1.1.1.7 root 800: timer_table[FLOPPY_TIMER].expires = jiffies+10*HZ;
801: timer_active |= 1 << FLOPPY_TIMER;
1.1.1.4 root 802: if ((seek_track == buffer_track) &&
803: (current_drive == buffer_drive)) {
804: buffer_area = floppy_track_buffer +
805: ((sector + head*floppy->sect)<<9);
806: if (command == FD_READ) {
807: copy_buffer(buffer_area,CURRENT->buffer);
1.1.1.7 root 808: request_done(1);
1.1.1.4 root 809: goto repeat;
1.1.1.7 root 810: } else if (command == FD_WRITE)
1.1.1.4 root 811: copy_buffer(CURRENT->buffer,buffer_area);
812: }
813: if (seek_track != current_track)
814: seek = 1;
815: sector++;
1.1 root 816: add_timer(ticks_to_floppy_on(current_drive),&floppy_on_interrupt);
817: }
818:
1.1.1.7 root 819: void do_fd_request(void)
820: {
821: cli();
822: while (fdc_busy) sleep_on(&fdc_wait);
823: fdc_busy = 1;
824: sti();
825: redo_fd_request();
826: }
827:
828: static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
829: unsigned int param)
830: {
831: int drive,cnt,okay;
832: struct floppy_struct *this;
833:
834: if (!suser()) return -EPERM;
835: drive = MINOR(inode->i_rdev);
836: switch (cmd) {
837: case FDFMTBEG:
838: return 0;
839: case FDFMTEND:
840: cli();
841: fake_change |= 1 << (drive & 3);
842: sti();
843: drive &= 3;
844: cmd = FDCLRPRM;
845: break;
846: case FDGETPRM:
847: if (drive > 3) this = &floppy_type[drive >> 2];
848: else if ((this = current_type[drive & 3]) == NULL)
849: return -ENODEV;
850: verify_area((void *) param,sizeof(struct floppy_struct));
851: for (cnt = 0; cnt < sizeof(struct floppy_struct); cnt++)
852: put_fs_byte(((char *) this)[cnt],
853: (char *) param+cnt);
854: return 0;
855: case FDFMTTRK:
856: cli();
857: while (format_status != FORMAT_NONE)
858: sleep_on(&format_done);
859: for (cnt = 0; cnt < sizeof(struct format_descr); cnt++)
860: ((char *) &format_req)[cnt] = get_fs_byte(
861: (char *) param+cnt);
862: format_req.device = drive;
863: format_status = FORMAT_WAIT;
864: format_errors = 0;
865: while (format_status != FORMAT_OKAY && format_status !=
866: FORMAT_ERROR) {
867: if (fdc_busy) sleep_on(&fdc_wait);
868: else {
869: fdc_busy = 1;
870: redo_fd_request();
871: }
872: }
873: while (format_status != FORMAT_OKAY && format_status !=
874: FORMAT_ERROR)
875: sleep_on(&format_done);
876: sti();
877: okay = format_status == FORMAT_OKAY;
878: format_status = FORMAT_NONE;
879: wake_up(&format_done);
880: return okay ? 0 : -EIO;
881: }
882: if (drive < 0 || drive > 3) return -EINVAL;
883: switch (cmd) {
884: case FDCLRPRM:
885: current_type[drive] = NULL;
886: floppy_sizes[drive] = MAX_DISK_SIZE;
887: keep_data[drive] = 0;
888: break;
889: case FDSETPRM:
890: case FDDEFPRM:
891: for (cnt = 0; cnt < sizeof(struct floppy_struct); cnt++)
892: ((char *) &user_params[drive])[cnt] =
893: get_fs_byte((char *) param+cnt);
894: current_type[drive] = &user_params[drive];
895: floppy_sizes[drive] = user_params[drive].size >> 1;
896: if (cmd == FDDEFPRM) keep_data[drive] = -1;
897: else {
898: cli();
899: while (fdc_busy) sleep_on(&fdc_wait);
900: fdc_busy = 1;
901: sti();
902: outb_p((current_DOR & 0xfc) | drive |
903: (0x10 << drive),FD_DOR);
904: for (cnt = 0; cnt < 1000; cnt++) __asm__("nop");
905: keep_data[drive] = (inb(FD_DIR) & 0x80) ? 1 : 0;
906: outb_p(current_DOR,FD_DOR);
907: fdc_busy = 0;
908: wake_up(&fdc_wait);
909: }
910: break;
911: case FDMSGON:
912: ftd_msg[drive] = 1;
913: break;
914: case FDMSGOFF:
915: ftd_msg[drive] = 0;
916: break;
917: default:
918: return -EINVAL;
919: }
920: return 0;
921: }
922:
923: #define CMOS_READ(addr) ({ \
924: outb_p(0x80|addr,0x70); \
925: inb_p(0x71); \
926: })
927:
928: static struct floppy_struct *find_base(int drive,int code)
929: {
930: struct floppy_struct *base;
931:
932: if (code > 0 && code < 5) {
933: base = &floppy_types[(code-1)*2];
934: printk("fd%d is %s",drive,base->name);
935: return base;
936: }
937: printk("fd%d is unknown type %d",drive,code);
938: return NULL;
939: }
940:
941: static void config_types(void)
942: {
943: printk("Floppy drive(s): ");
944: base_type[0] = find_base(0,(CMOS_READ(0x10) >> 4) & 15);
1.1.1.8 root 945: if (((CMOS_READ(0x14) >> 6) & 1) == 0)
946: base_type[1] = NULL;
1.1.1.7 root 947: else {
948: printk(", ");
949: base_type[1] = find_base(1,CMOS_READ(0x10) & 15);
950: }
951: base_type[2] = base_type[3] = NULL;
952: printk("\r\n");
953: }
954:
955: static int floppy_open(struct inode * inode, struct file * filp)
956: {
957: if (filp->f_mode)
958: check_disk_change(inode->i_rdev);
959: return 0;
960: }
961:
962: static void floppy_release(struct inode * inode, struct file * filp)
963: {
964: sync_dev(inode->i_rdev);
965: }
966:
967: static struct file_operations floppy_fops = {
968: NULL, /* lseek - default */
969: block_read, /* read - general block-dev read */
970: block_write, /* write - general block-dev write */
971: NULL, /* readdir - bad */
972: NULL, /* select */
973: fd_ioctl, /* ioctl */
974: floppy_open, /* open */
975: floppy_release /* release */
1.1.1.3 root 976: };
977:
1.1 root 978: void floppy_init(void)
979: {
1.1.1.4 root 980: outb(current_DOR,FD_DOR);
1.1.1.3 root 981: blk_size[MAJOR_NR] = floppy_sizes;
1.1 root 982: blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
1.1.1.7 root 983: blkdev_fops[MAJOR_NR] = &floppy_fops;
984: timer_table[FLOPPY_TIMER].fn = floppy_shutdown;
985: timer_active &= ~(1 << FLOPPY_TIMER);
986: config_types();
1.1.1.4 root 987: set_intr_gate(0x26,&floppy_interrupt);
1.1 root 988: outb(inb_p(0x21)&~0x40,0x21);
989: }
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