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