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1.1 root 1: // 16bit code to access floppy drives.
2: //
3: // Copyright (C) 2008,2009 Kevin O'Connor <[email protected]>
4: // Copyright (C) 2002 MandrakeSoft S.A.
5: //
6: // This file may be distributed under the terms of the GNU LGPLv3 license.
7:
8: #include "types.h" // u8
9: #include "disk.h" // DISK_RET_SUCCESS
10: #include "config.h" // CONFIG_FLOPPY
11: #include "biosvar.h" // SET_BDA
12: #include "util.h" // wait_irq
13: #include "cmos.h" // inb_cmos
14: #include "pic.h" // eoi_pic1
15: #include "bregs.h" // struct bregs
16:
17: #define FLOPPY_SIZE_CODE 0x02 // 512 byte sectors
18: #define FLOPPY_DATALEN 0xff // Not used - because size code is 0x02
19: #define FLOPPY_MOTOR_TICKS 37 // ~2 seconds
20: #define FLOPPY_FILLBYTE 0xf6
21: #define FLOPPY_GAPLEN 0x1B
22: #define FLOPPY_FORMAT_GAPLEN 0x6c
23:
24: // New diskette parameter table adding 3 parameters from IBM
25: // Since no provisions are made for multiple drive types, most
26: // values in this table are ignored. I set parameters for 1.44M
27: // floppy here
28: struct floppy_ext_dbt_s diskette_param_table2 VAR16VISIBLE = {
29: .dbt = {
30: .specify1 = 0xAF, // step rate 12ms, head unload 240ms
31: .specify2 = 0x02, // head load time 4ms, DMA used
32: .shutoff_ticks = FLOPPY_MOTOR_TICKS, // ~2 seconds
33: .bps_code = FLOPPY_SIZE_CODE,
34: .sectors = 18,
35: .interblock_len = FLOPPY_GAPLEN,
36: .data_len = FLOPPY_DATALEN,
37: .gap_len = FLOPPY_FORMAT_GAPLEN,
38: .fill_byte = FLOPPY_FILLBYTE,
39: .settle_time = 0x0F, // 15ms
40: .startup_time = 0x08, // 1 second
41: },
42: .max_track = 79, // maximum track
43: .data_rate = 0, // data transfer rate
44: .drive_type = 4, // drive type in cmos
45: };
46:
47: // Since no provisions are made for multiple drive types, most
48: // values in this table are ignored. I set parameters for 1.44M
49: // floppy here
50: struct floppy_dbt_s diskette_param_table VAR16FIXED(0xefc7) = {
51: .specify1 = 0xAF,
52: .specify2 = 0x02,
53: .shutoff_ticks = FLOPPY_MOTOR_TICKS,
54: .bps_code = FLOPPY_SIZE_CODE,
55: .sectors = 18,
56: .interblock_len = FLOPPY_GAPLEN,
57: .data_len = FLOPPY_DATALEN,
58: .gap_len = FLOPPY_FORMAT_GAPLEN,
59: .fill_byte = FLOPPY_FILLBYTE,
60: .settle_time = 0x0F,
61: .startup_time = 0x08,
62: };
63:
64: struct floppyinfo_s {
65: struct chs_s chs;
66: u8 config_data;
67: u8 media_state;
68: };
69:
70: struct floppyinfo_s FloppyInfo[] VAR16VISIBLE = {
71: // Unknown
72: { {0, 0, 0}, 0x00, 0x00},
73: // 1 - 360KB, 5.25" - 2 heads, 40 tracks, 9 sectors
74: { {2, 40, 9}, 0x00, 0x25},
75: // 2 - 1.2MB, 5.25" - 2 heads, 80 tracks, 15 sectors
76: { {2, 80, 15}, 0x00, 0x25},
77: // 3 - 720KB, 3.5" - 2 heads, 80 tracks, 9 sectors
78: { {2, 80, 9}, 0x00, 0x17},
79: // 4 - 1.44MB, 3.5" - 2 heads, 80 tracks, 18 sectors
80: { {2, 80, 18}, 0x00, 0x17},
81: // 5 - 2.88MB, 3.5" - 2 heads, 80 tracks, 36 sectors
82: { {2, 80, 36}, 0xCC, 0xD7},
83: // 6 - 160k, 5.25" - 1 heads, 40 tracks, 8 sectors
84: { {1, 40, 8}, 0x00, 0x27},
85: // 7 - 180k, 5.25" - 1 heads, 40 tracks, 9 sectors
86: { {1, 40, 9}, 0x00, 0x27},
87: // 8 - 320k, 5.25" - 2 heads, 40 tracks, 8 sectors
88: { {2, 40, 8}, 0x00, 0x27},
89: };
90:
91: struct drive_s *
92: addFloppy(int floppyid, int ftype, int driver)
93: {
94: if (ftype <= 0 || ftype >= ARRAY_SIZE(FloppyInfo)) {
95: dprintf(1, "Bad floppy type %d\n", ftype);
96: return NULL;
97: }
98:
1.1.1.3 root 99: char *desc = malloc_tmp(MAXDESCSIZE);
100: struct drive_s *drive_g = malloc_fseg(sizeof(*drive_g));
101: if (!drive_g || !desc) {
102: warn_noalloc();
103: free(desc);
104: free(drive_g);
1.1 root 105: return NULL;
1.1.1.3 root 106: }
107: memset(drive_g, 0, sizeof(*drive_g));
1.1 root 108: drive_g->cntl_id = floppyid;
109: drive_g->type = driver;
110: drive_g->blksize = DISK_SECTOR_SIZE;
111: drive_g->floppy_type = ftype;
112: drive_g->sectors = (u64)-1;
1.1.1.3 root 113: drive_g->desc = desc;
114: snprintf(desc, MAXDESCSIZE, "drive %c", 'A' + floppyid);
1.1 root 115:
116: memcpy(&drive_g->lchs, &FloppyInfo[ftype].chs
117: , sizeof(FloppyInfo[ftype].chs));
118:
119: map_floppy_drive(drive_g);
120: return drive_g;
121: }
122:
123: void
1.1.1.2 root 124: floppy_setup(void)
1.1 root 125: {
126: if (! CONFIG_FLOPPY)
127: return;
128: dprintf(3, "init floppy drives\n");
129:
130: if (CONFIG_COREBOOT) {
131: // XXX - disable floppies on coreboot for now.
132: } else {
133: u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
134: if (type & 0xf0)
135: addFloppy(0, type >> 4, DTYPE_FLOPPY);
136: if (type & 0x0f)
137: addFloppy(1, type & 0x0f, DTYPE_FLOPPY);
138: }
139:
140: outb(0x02, PORT_DMA1_MASK_REG);
141:
1.1.1.4 ! root 142: enable_hwirq(6, FUNC16(entry_0e));
1.1 root 143: }
144:
145: // Find a floppy type that matches a given image size.
146: int
147: find_floppy_type(u32 size)
148: {
149: int i;
150: for (i=1; i<ARRAY_SIZE(FloppyInfo); i++) {
151: struct chs_s *c = &FloppyInfo[i].chs;
152: if (c->cylinders * c->heads * c->spt * DISK_SECTOR_SIZE == size)
153: return i;
154: }
155: return -1;
156: }
157:
158:
159: /****************************************************************
160: * Low-level floppy IO
161: ****************************************************************/
162:
163: static void
1.1.1.2 root 164: floppy_reset_controller(void)
1.1 root 165: {
166: // Reset controller
167: u8 val8 = inb(PORT_FD_DOR);
168: outb(val8 & ~0x04, PORT_FD_DOR);
169: outb(val8 | 0x04, PORT_FD_DOR);
170:
171: // Wait for controller to come out of reset
172: while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
173: ;
174: }
175:
176: static int
1.1.1.2 root 177: wait_floppy_irq(void)
1.1 root 178: {
179: ASSERT16();
180: u8 v;
181: for (;;) {
182: if (!GET_BDA(floppy_motor_counter))
183: return -1;
184: v = GET_BDA(floppy_recalibration_status);
185: if (v & FRS_TIMEOUT)
186: break;
1.1.1.3 root 187: // Could use wait_irq() here, but that causes issues on
188: // bochs, so use yield() instead.
189: yield();
1.1 root 190: }
191:
192: v &= ~FRS_TIMEOUT;
193: SET_BDA(floppy_recalibration_status, v);
194: return 0;
195: }
196:
197: static void
198: floppy_prepare_controller(u8 floppyid)
199: {
200: CLEARBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
201:
202: // turn on motor of selected drive, DMA & int enabled, normal operation
203: u8 prev_reset = inb(PORT_FD_DOR) & 0x04;
204: u8 dor = 0x10;
205: if (floppyid)
206: dor = 0x20;
207: dor |= 0x0c;
208: dor |= floppyid;
209: outb(dor, PORT_FD_DOR);
210:
211: // reset the disk motor timeout value of INT 08
212: SET_BDA(floppy_motor_counter, FLOPPY_MOTOR_TICKS);
213:
214: // wait for drive readiness
215: while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
216: ;
217:
218: if (!prev_reset)
219: wait_floppy_irq();
220: }
221:
222: static int
223: floppy_pio(u8 *cmd, u8 cmdlen)
224: {
225: floppy_prepare_controller(cmd[1] & 1);
226:
227: // send command to controller
228: u8 i;
229: for (i=0; i<cmdlen; i++)
230: outb(cmd[i], PORT_FD_DATA);
231:
232: int ret = wait_floppy_irq();
233: if (ret) {
234: floppy_reset_controller();
235: return -1;
236: }
237:
238: return 0;
239: }
240:
241: static int
242: floppy_cmd(struct disk_op_s *op, u16 count, u8 *cmd, u8 cmdlen)
243: {
244: // es:bx = pointer to where to place information from diskette
245: u32 addr = (u32)op->buf_fl;
246:
247: // check for 64K boundary overrun
248: u16 end = count - 1;
249: u32 last_addr = addr + end;
250: if ((addr >> 16) != (last_addr >> 16))
251: return DISK_RET_EBOUNDARY;
252:
253: u8 mode_register = 0x4a; // single mode, increment, autoinit disable,
254: if (cmd[0] == 0xe6)
255: // read
256: mode_register = 0x46;
257:
258: //DEBUGF("floppy dma c2\n");
259: outb(0x06, PORT_DMA1_MASK_REG);
260: outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
261: outb(addr, PORT_DMA_ADDR_2);
262: outb(addr>>8, PORT_DMA_ADDR_2);
263: outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
264: outb(end, PORT_DMA_CNT_2);
265: outb(end>>8, PORT_DMA_CNT_2);
266:
267: // port 0b: DMA-1 Mode Register
268: // transfer type=write, channel 2
269: outb(mode_register, PORT_DMA1_MODE_REG);
270:
271: // port 81: DMA-1 Page Register, channel 2
272: outb(addr>>16, PORT_DMA_PAGE_2);
273:
274: outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2
275:
276: int ret = floppy_pio(cmd, cmdlen);
277: if (ret)
278: return DISK_RET_ETIMEOUT;
279:
280: // check port 3f4 for accessibility to status bytes
281: if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
282: return DISK_RET_ECONTROLLER;
283:
284: // read 7 return status bytes from controller
285: u8 i;
286: for (i=0; i<7; i++) {
287: u8 v = inb(PORT_FD_DATA);
288: cmd[i] = v;
289: SET_BDA(floppy_return_status[i], v);
290: }
291:
292: return DISK_RET_SUCCESS;
293: }
294:
295:
296: /****************************************************************
297: * Floppy media sense
298: ****************************************************************/
299:
300: static inline void
301: set_diskette_current_cyl(u8 floppyid, u8 cyl)
302: {
303: SET_BDA(floppy_track[floppyid], cyl);
304: }
305:
306: static void
307: floppy_drive_recal(u8 floppyid)
308: {
309: // send Recalibrate command (2 bytes) to controller
310: u8 data[12];
311: data[0] = 0x07; // 07: Recalibrate
312: data[1] = floppyid; // 0=drive0, 1=drive1
313: floppy_pio(data, 2);
314:
315: SETBITS_BDA(floppy_recalibration_status, 1<<floppyid);
316: set_diskette_current_cyl(floppyid, 0);
317: }
318:
319: static int
320: floppy_media_sense(struct drive_s *drive_g)
321: {
322: // for now cheat and get drive type from CMOS,
323: // assume media is same as drive type
324:
325: // ** config_data **
326: // Bitfields for diskette media control:
327: // Bit(s) Description (Table M0028)
328: // 7-6 last data rate set by controller
329: // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
330: // 5-4 last diskette drive step rate selected
331: // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
332: // 3-2 {data rate at start of operation}
333: // 1-0 reserved
334:
335: // ** media_state **
336: // Bitfields for diskette drive media state:
337: // Bit(s) Description (Table M0030)
338: // 7-6 data rate
339: // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
340: // 5 double stepping required (e.g. 360kB in 1.2MB)
341: // 4 media type established
342: // 3 drive capable of supporting 4MB media
343: // 2-0 on exit from BIOS, contains
344: // 000 trying 360kB in 360kB
345: // 001 trying 360kB in 1.2MB
346: // 010 trying 1.2MB in 1.2MB
347: // 011 360kB in 360kB established
348: // 100 360kB in 1.2MB established
349: // 101 1.2MB in 1.2MB established
350: // 110 reserved
351: // 111 all other formats/drives
352:
353: u8 ftype = GET_GLOBAL(drive_g->floppy_type);
354: SET_BDA(floppy_last_data_rate, GET_GLOBAL(FloppyInfo[ftype].config_data));
355: u8 floppyid = GET_GLOBAL(drive_g->cntl_id);
356: SET_BDA(floppy_media_state[floppyid]
357: , GET_GLOBAL(FloppyInfo[ftype].media_state));
358: return DISK_RET_SUCCESS;
359: }
360:
361: static int
362: check_recal_drive(struct drive_s *drive_g)
363: {
364: u8 floppyid = GET_GLOBAL(drive_g->cntl_id);
365: if ((GET_BDA(floppy_recalibration_status) & (1<<floppyid))
366: && (GET_BDA(floppy_media_state[floppyid]) & FMS_MEDIA_DRIVE_ESTABLISHED))
367: // Media is known.
368: return DISK_RET_SUCCESS;
369:
370: // Recalibrate drive.
371: floppy_drive_recal(floppyid);
372:
373: // Sense media.
374: return floppy_media_sense(drive_g);
375: }
376:
377:
378: /****************************************************************
379: * Floppy handlers
380: ****************************************************************/
381:
382: static void
383: lba2chs(struct disk_op_s *op, u8 *track, u8 *sector, u8 *head)
384: {
385: u32 lba = op->lba;
386:
387: u32 tmp = lba + 1;
388: u16 nlspt = GET_GLOBAL(op->drive_g->lchs.spt);
389: *sector = tmp % nlspt;
390:
391: tmp /= nlspt;
392: u16 nlh = GET_GLOBAL(op->drive_g->lchs.heads);
393: *head = tmp % nlh;
394:
395: tmp /= nlh;
396: *track = tmp;
397: }
398:
399: // diskette controller reset
400: static int
401: floppy_reset(struct disk_op_s *op)
402: {
403: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
404: set_diskette_current_cyl(floppyid, 0); // current cylinder
405: return DISK_RET_SUCCESS;
406: }
407:
408: // Read Diskette Sectors
409: static int
410: floppy_read(struct disk_op_s *op)
411: {
412: int res = check_recal_drive(op->drive_g);
413: if (res)
414: goto fail;
415:
416: u8 track, sector, head;
417: lba2chs(op, &track, §or, &head);
418:
419: // send read-normal-data command (9 bytes) to controller
420: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
421: u8 data[12];
422: data[0] = 0xe6; // e6: read normal data
423: data[1] = (head << 2) | floppyid; // HD DR1 DR2
424: data[2] = track;
425: data[3] = head;
426: data[4] = sector;
427: data[5] = FLOPPY_SIZE_CODE;
428: data[6] = sector + op->count - 1; // last sector to read on track
429: data[7] = FLOPPY_GAPLEN;
430: data[8] = FLOPPY_DATALEN;
431:
432: res = floppy_cmd(op, op->count * DISK_SECTOR_SIZE, data, 9);
433: if (res)
434: goto fail;
435:
436: if (data[0] & 0xc0) {
437: res = DISK_RET_ECONTROLLER;
438: goto fail;
439: }
440:
441: // ??? should track be new val from return_status[3] ?
442: set_diskette_current_cyl(floppyid, track);
443: return DISK_RET_SUCCESS;
444: fail:
445: op->count = 0; // no sectors read
446: return res;
447: }
448:
449: // Write Diskette Sectors
450: static int
451: floppy_write(struct disk_op_s *op)
452: {
453: int res = check_recal_drive(op->drive_g);
454: if (res)
455: goto fail;
456:
457: u8 track, sector, head;
458: lba2chs(op, &track, §or, &head);
459:
460: // send write-normal-data command (9 bytes) to controller
461: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
462: u8 data[12];
463: data[0] = 0xc5; // c5: write normal data
464: data[1] = (head << 2) | floppyid; // HD DR1 DR2
465: data[2] = track;
466: data[3] = head;
467: data[4] = sector;
468: data[5] = FLOPPY_SIZE_CODE;
469: data[6] = sector + op->count - 1; // last sector to write on track
470: data[7] = FLOPPY_GAPLEN;
471: data[8] = FLOPPY_DATALEN;
472:
473: res = floppy_cmd(op, op->count * DISK_SECTOR_SIZE, data, 9);
474: if (res)
475: goto fail;
476:
477: if (data[0] & 0xc0) {
478: if (data[1] & 0x02)
479: res = DISK_RET_EWRITEPROTECT;
480: else
481: res = DISK_RET_ECONTROLLER;
482: goto fail;
483: }
484:
485: // ??? should track be new val from return_status[3] ?
486: set_diskette_current_cyl(floppyid, track);
487: return DISK_RET_SUCCESS;
488: fail:
489: op->count = 0; // no sectors read
490: return res;
491: }
492:
493: // Verify Diskette Sectors
494: static int
495: floppy_verify(struct disk_op_s *op)
496: {
497: int res = check_recal_drive(op->drive_g);
498: if (res)
499: goto fail;
500:
501: u8 track, sector, head;
502: lba2chs(op, &track, §or, &head);
503:
504: // ??? should track be new val from return_status[3] ?
505: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
506: set_diskette_current_cyl(floppyid, track);
507: return DISK_RET_SUCCESS;
508: fail:
509: op->count = 0; // no sectors read
510: return res;
511: }
512:
513: // format diskette track
514: static int
515: floppy_format(struct disk_op_s *op)
516: {
517: int ret = check_recal_drive(op->drive_g);
518: if (ret)
519: return ret;
520:
521: u8 head = op->lba;
522:
523: // send format-track command (6 bytes) to controller
524: u8 floppyid = GET_GLOBAL(op->drive_g->cntl_id);
525: u8 data[12];
526: data[0] = 0x4d; // 4d: format track
527: data[1] = (head << 2) | floppyid; // HD DR1 DR2
528: data[2] = FLOPPY_SIZE_CODE;
529: data[3] = op->count; // number of sectors per track
530: data[4] = FLOPPY_FORMAT_GAPLEN;
531: data[5] = FLOPPY_FILLBYTE;
532:
533: ret = floppy_cmd(op, op->count * 4, data, 6);
534: if (ret)
535: return ret;
536:
537: if (data[0] & 0xc0) {
538: if (data[1] & 0x02)
539: return DISK_RET_EWRITEPROTECT;
540: return DISK_RET_ECONTROLLER;
541: }
542:
543: set_diskette_current_cyl(floppyid, 0);
544: return DISK_RET_SUCCESS;
545: }
546:
547: int
548: process_floppy_op(struct disk_op_s *op)
549: {
550: if (!CONFIG_FLOPPY)
551: return 0;
552:
553: switch (op->command) {
554: case CMD_RESET:
555: return floppy_reset(op);
556: case CMD_READ:
557: return floppy_read(op);
558: case CMD_WRITE:
559: return floppy_write(op);
560: case CMD_VERIFY:
561: return floppy_verify(op);
562: case CMD_FORMAT:
563: return floppy_format(op);
564: default:
565: op->count = 0;
566: return DISK_RET_EPARAM;
567: }
568: }
569:
570:
571: /****************************************************************
572: * HW irqs
573: ****************************************************************/
574:
575: // INT 0Eh Diskette Hardware ISR Entry Point
576: void VISIBLE16
1.1.1.2 root 577: handle_0e(void)
1.1 root 578: {
579: debug_isr(DEBUG_ISR_0e);
580: if (! CONFIG_FLOPPY)
581: goto done;
582:
583: if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
584: outb(0x08, PORT_FD_DATA); // sense interrupt status
585: while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
586: ;
587: do {
588: inb(PORT_FD_DATA);
589: } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
590: }
591: // diskette interrupt has occurred
592: SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
593:
594: done:
595: eoi_pic1();
596: }
597:
598: // Called from int08 handler.
599: void
1.1.1.2 root 600: floppy_tick(void)
1.1 root 601: {
602: if (! CONFIG_FLOPPY)
603: return;
604:
605: // time to turn off drive(s)?
606: u8 fcount = GET_BDA(floppy_motor_counter);
607: if (fcount) {
608: fcount--;
609: SET_BDA(floppy_motor_counter, fcount);
610: if (fcount == 0)
611: // turn motor(s) off
612: outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR);
613: }
614: }
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