1 // 16bit code to access floppy drives.
3 // Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2002 MandrakeSoft S.A.
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
8 #include "types.h" // u8
9 #include "disk.h" // DISK_RET_SUCCESS
10 #include "config.h" // CONFIG_FLOPPY_SUPPORT
11 #include "biosvar.h" // SET_BDA
12 #include "util.h" // irq_disable
13 #include "cmos.h" // inb_cmos
14 #include "pic.h" // eoi_pic1
15 #include "bregs.h" // struct bregs
17 #define BX_FLOPPY_ON_CNT 37 /* 2 seconds */
19 // New diskette parameter table adding 3 parameters from IBM
20 // Since no provisions are made for multiple drive types, most
21 // values in this table are ignored. I set parameters for 1.44M
23 struct floppy_ext_dbt_s diskette_param_table2 VAR16_32 = {
26 .specify2 = 0x02, // head load time 0000001, DMA used
27 .shutoff_ticks = 0x25,
30 .interblock_len = 0x1B,
37 .max_track = 79, // maximum track
38 .data_rate = 0, // data transfer rate
39 .drive_type = 4, // drive type in cmos
45 if (! CONFIG_FLOPPY_SUPPORT)
47 dprintf(3, "init floppy drives\n");
49 // XXX - disable floppies on coreboot for now.
50 outb_cmos(0, CMOS_FLOPPY_DRIVE_TYPE);
51 u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
63 SET_BDA(floppy_harddisk_info, out);
65 // Update equipment word bits for floppy
66 if (num_floppies == 1)
67 // 1 drive, ready for boot
68 SETBITS_BDA(equipment_list_flags, 0x01);
69 else if (num_floppies == 2)
70 // 2 drives, ready for boot
71 SETBITS_BDA(equipment_list_flags, 0x41);
73 outb(0x02, PORT_DMA1_MASK_REG);
75 enable_hwirq(6, entry_0e);
79 set_diskette_current_cyl(u8 drive, u8 cyl)
82 SET_BDA(floppy_track1, cyl);
84 SET_BDA(floppy_track0, cyl);
88 get_drive_type(u8 drive)
90 // check CMOS to see if drive exists
91 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
100 floppy_media_known(u8 drive)
102 if (!(GET_BDA(floppy_recalibration_status) & (1<<drive)))
104 u8 v = GET_BDA(floppy_media_state[drive]);
105 if (!(v & FMS_MEDIA_DRIVE_ESTABLISHED))
111 floppy_reset_controller()
114 u8 val8 = inb(PORT_FD_DOR);
115 outb(val8 & ~0x04, PORT_FD_DOR);
116 outb(val8 | 0x04, PORT_FD_DOR);
118 // Wait for controller to come out of reset
119 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
124 floppy_prepare_controller(u8 drive)
126 CLEARBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
128 // turn on motor of selected drive, DMA & int enabled, normal operation
129 u8 prev_reset = inb(PORT_FD_DOR) & 0x04;
135 outb(dor, PORT_FD_DOR);
137 // reset the disk motor timeout value of INT 08
138 SET_BDA(floppy_motor_counter, BX_FLOPPY_ON_CNT);
140 // wait for drive readiness
141 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
144 if (prev_reset == 0) {
148 v = GET_BDA(floppy_recalibration_status);
156 SET_BDA(floppy_recalibration_status, v);
161 floppy_pio(u8 *cmd, u8 cmdlen)
163 floppy_prepare_controller(cmd[1] & 1);
165 // send command to controller
167 for (i=0; i<cmdlen; i++)
168 outb(cmd[i], PORT_FD_DATA);
173 if (!GET_BDA(floppy_motor_counter)) {
175 floppy_reset_controller();
178 v = GET_BDA(floppy_recalibration_status);
186 SET_BDA(floppy_recalibration_status, v);
191 #define floppy_ret(regs, code) \
192 __floppy_ret((regs), (code) | (__LINE__ << 8), __func__)
195 __floppy_ret(struct bregs *regs, u32 linecode, const char *fname)
198 SET_BDA(floppy_last_status, code);
200 __set_code_fail(regs, linecode, fname);
202 set_code_success(regs);
206 floppy_cmd(struct bregs *regs, u16 count, u8 *cmd, u8 cmdlen)
208 // es:bx = pointer to where to place information from diskette
209 u32 addr = (u32)MAKE_FARPTR(regs->es, regs->bx);
211 // check for 64K boundary overrun
212 u32 last_addr = addr + count;
213 if ((addr >> 16) != (last_addr >> 16)) {
214 floppy_ret(regs, DISK_RET_EBOUNDARY);
218 u8 mode_register = 0x4a; // single mode, increment, autoinit disable,
221 mode_register = 0x46;
223 //DEBUGF("floppy dma c2\n");
224 outb(0x06, PORT_DMA1_MASK_REG);
225 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
226 outb(addr, PORT_DMA_ADDR_2);
227 outb(addr>>8, PORT_DMA_ADDR_2);
228 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
229 outb(count, PORT_DMA_CNT_2);
230 outb(count>>8, PORT_DMA_CNT_2);
232 // port 0b: DMA-1 Mode Register
233 // transfer type=write, channel 2
234 outb(mode_register, PORT_DMA1_MODE_REG);
236 // port 81: DMA-1 Page Register, channel 2
237 outb(addr>>16, PORT_DMA_PAGE_2);
239 outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2
241 int ret = floppy_pio(cmd, cmdlen);
243 floppy_ret(regs, DISK_RET_ETIMEOUT);
247 // check port 3f4 for accessibility to status bytes
248 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
249 BX_PANIC("int13_diskette: ctrl not ready\n");
251 // read 7 return status bytes from controller
253 for (i=0; i<7; i++) {
254 u8 v = inb(PORT_FD_DATA);
256 SET_BDA(floppy_return_status[i], v);
263 floppy_drive_recal(u8 drive)
265 // send Recalibrate command (2 bytes) to controller
267 data[0] = 0x07; // 07: Recalibrate
268 data[1] = drive; // 0=drive0, 1=drive1
271 SETBITS_BDA(floppy_recalibration_status, 1<<drive);
272 set_diskette_current_cyl(drive, 0);
276 floppy_media_sense(u8 drive)
279 u8 config_data, media_state;
281 floppy_drive_recal(drive);
283 // for now cheat and get drive type from CMOS,
284 // assume media is same as drive type
287 // Bitfields for diskette media control:
288 // Bit(s) Description (Table M0028)
289 // 7-6 last data rate set by controller
290 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
291 // 5-4 last diskette drive step rate selected
292 // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
293 // 3-2 {data rate at start of operation}
297 // Bitfields for diskette drive media state:
298 // Bit(s) Description (Table M0030)
300 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
301 // 5 double stepping required (e.g. 360kB in 1.2MB)
302 // 4 media type established
303 // 3 drive capable of supporting 4MB media
304 // 2-0 on exit from BIOS, contains
305 // 000 trying 360kB in 360kB
306 // 001 trying 360kB in 1.2MB
307 // 010 trying 1.2MB in 1.2MB
308 // 011 360kB in 360kB established
309 // 100 360kB in 1.2MB established
310 // 101 1.2MB in 1.2MB established
312 // 111 all other formats/drives
314 switch (get_drive_type(drive)) {
317 config_data = 0x00; // 0000 0000
318 media_state = 0x25; // 0010 0101
322 // 1.2 MB 5.25" drive
323 config_data = 0x00; // 0000 0000
324 media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5)
329 config_data = 0x00; // 0000 0000 ???
330 media_state = 0x17; // 0001 0111
334 // 1.44 MB 3.5" drive
335 config_data = 0x00; // 0000 0000
336 media_state = 0x17; // 0001 0111
340 // 2.88 MB 3.5" drive
341 config_data = 0xCC; // 1100 1100
342 media_state = 0xD7; // 1101 0111
346 // Extended floppy size uses special cmos setting
349 config_data = 0x00; // 0000 0000
350 media_state = 0x27; // 0010 0111
355 config_data = 0x00; // 0000 0000
356 media_state = 0x27; // 0010 0111
361 config_data = 0x00; // 0000 0000
362 media_state = 0x27; // 0010 0111
367 config_data = 0x00; // 0000 0000
368 media_state = 0x00; // 0000 0000
372 SET_BDA(floppy_last_data_rate, config_data);
373 SET_BDA(floppy_media_state[drive], media_state);
378 check_drive(struct bregs *regs, u8 drive)
380 // see if drive exists
381 if (drive > 1 || !get_drive_type(drive)) {
382 // XXX - return type doesn't match
383 floppy_ret(regs, DISK_RET_ETIMEOUT);
387 // see if media in drive, and type is known
388 if (floppy_media_known(drive) == 0 && floppy_media_sense(drive) == 0) {
389 floppy_ret(regs, DISK_RET_EMEDIA);
395 // diskette controller reset
397 floppy_1300(struct bregs *regs, u8 drive)
400 floppy_ret(regs, DISK_RET_EPARAM);
403 if (!get_drive_type(drive)) {
404 floppy_ret(regs, DISK_RET_ETIMEOUT);
407 set_diskette_current_cyl(drive, 0); // current cylinder
408 floppy_ret(regs, DISK_RET_SUCCESS);
411 // Read Diskette Status
413 floppy_1301(struct bregs *regs, u8 drive)
415 u8 v = GET_BDA(floppy_last_status);
420 // Read Diskette Sectors
422 floppy_1302(struct bregs *regs, u8 drive)
424 if (check_drive(regs, drive))
427 u8 num_sectors = regs->al;
429 u8 sector = regs->cl;
432 if (head > 1 || sector == 0 || num_sectors == 0
433 || track > 79 || num_sectors > 72) {
434 floppy_ret(regs, DISK_RET_EPARAM);
438 // send read-normal-data command (9 bytes) to controller
440 data[0] = 0xe6; // e6: read normal data
441 data[1] = (head << 2) | drive; // HD DR1 DR2
445 data[5] = 2; // 512 byte sector size
446 data[6] = sector + num_sectors - 1; // last sector to read on track
447 data[7] = 0; // Gap length
448 data[8] = 0xff; // Gap length
450 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
454 if (data[0] & 0xc0) {
455 floppy_ret(regs, DISK_RET_ECONTROLLER);
459 // ??? should track be new val from return_status[3] ?
460 set_diskette_current_cyl(drive, track);
461 // AL = number of sectors read (same value as passed)
462 floppy_ret(regs, DISK_RET_SUCCESS);
465 regs->al = 0; // no sectors read
468 // Write Diskette Sectors
470 floppy_1303(struct bregs *regs, u8 drive)
472 if (check_drive(regs, drive))
475 u8 num_sectors = regs->al;
477 u8 sector = regs->cl;
480 if (head > 1 || sector == 0 || num_sectors == 0
481 || track > 79 || num_sectors > 72) {
482 floppy_ret(regs, DISK_RET_EPARAM);
486 // send write-normal-data command (9 bytes) to controller
488 data[0] = 0xc5; // c5: write normal data
489 data[1] = (head << 2) | drive; // HD DR1 DR2
493 data[5] = 2; // 512 byte sector size
494 data[6] = sector + num_sectors - 1; // last sector to write on track
495 data[7] = 0; // Gap length
496 data[8] = 0xff; // Gap length
498 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
502 if (data[0] & 0xc0) {
503 if (data[1] & 0x02) {
504 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
507 BX_PANIC("int13_diskette_function: read error\n");
510 // ??? should track be new val from return_status[3] ?
511 set_diskette_current_cyl(drive, track);
512 // AL = number of sectors read (same value as passed)
513 floppy_ret(regs, DISK_RET_SUCCESS);
516 regs->al = 0; // no sectors read
519 // Verify Diskette Sectors
521 floppy_1304(struct bregs *regs, u8 drive)
523 if (check_drive(regs, drive))
526 u8 num_sectors = regs->al;
528 u8 sector = regs->cl;
531 if (head > 1 || sector == 0 || num_sectors == 0
532 || track > 79 || num_sectors > 72) {
533 floppy_ret(regs, DISK_RET_EPARAM);
537 // ??? should track be new val from return_status[3] ?
538 set_diskette_current_cyl(drive, track);
539 // AL = number of sectors verified (same value as passed)
540 floppy_ret(regs, DISK_RET_SUCCESS);
543 regs->al = 0; // no sectors read
546 // format diskette track
548 floppy_1305(struct bregs *regs, u8 drive)
550 dprintf(3, "floppy f05\n");
552 if (check_drive(regs, drive))
555 u8 num_sectors = regs->al;
558 if (head > 1 || num_sectors == 0 || num_sectors > 18) {
559 floppy_ret(regs, DISK_RET_EPARAM);
563 // send format-track command (6 bytes) to controller
565 data[0] = 0x4d; // 4d: format track
566 data[1] = (head << 2) | drive; // HD DR1 DR2
567 data[2] = 2; // 512 byte sector size
568 data[3] = num_sectors; // number of sectors per track
569 data[4] = 0; // Gap length
570 data[5] = 0xf6; // Fill byte
572 int ret = floppy_cmd(regs, (num_sectors * 4) - 1, data, 6);
576 if (data[0] & 0xc0) {
577 if (data[1] & 0x02) {
578 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
581 BX_PANIC("int13_diskette_function: read error\n");
584 set_diskette_current_cyl(drive, 0);
588 // read diskette drive parameters
590 floppy_1308(struct bregs *regs, u8 drive)
592 dprintf(3, "floppy f08\n");
594 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
596 if (drive_type & 0xf0)
598 if (drive_type & 0x0f)
608 regs->dl = num_floppies;
619 regs->bl = drive_type;
622 regs->dl = num_floppies;
624 switch (drive_type) {
627 regs->dh = 0; // max head #
630 case 1: // 360KB, 5.25"
631 regs->cx = 0x2709; // 40 tracks, 9 sectors
632 regs->dh = 1; // max head #
635 case 2: // 1.2MB, 5.25"
636 regs->cx = 0x4f0f; // 80 tracks, 15 sectors
637 regs->dh = 1; // max head #
640 case 3: // 720KB, 3.5"
641 regs->cx = 0x4f09; // 80 tracks, 9 sectors
642 regs->dh = 1; // max head #
645 case 4: // 1.44MB, 3.5"
646 regs->cx = 0x4f12; // 80 tracks, 18 sectors
647 regs->dh = 1; // max head #
650 case 5: // 2.88MB, 3.5"
651 regs->cx = 0x4f24; // 80 tracks, 36 sectors
652 regs->dh = 1; // max head #
655 case 6: // 160k, 5.25"
656 regs->cx = 0x2708; // 40 tracks, 8 sectors
657 regs->dh = 0; // max head #
660 case 7: // 180k, 5.25"
661 regs->cx = 0x2709; // 40 tracks, 9 sectors
662 regs->dh = 0; // max head #
665 case 8: // 320k, 5.25"
666 regs->cx = 0x2708; // 40 tracks, 8 sectors
667 regs->dh = 1; // max head #
671 BX_PANIC("floppy: int13: bad floppy type\n");
674 /* set es & di to point to 11 byte diskette param table in ROM */
676 regs->di = (u32)&diskette_param_table2;
677 /* disk status not changed upon success */
681 // read diskette drive type
683 floppy_1315(struct bregs *regs, u8 drive)
685 dprintf(6, "floppy f15\n");
688 regs->ah = 0; // only 2 drives supported
689 // set_diskette_ret_status here ???
692 u8 drive_type = get_drive_type(drive);
694 regs->ah = (drive_type != 0);
698 // get diskette change line status
700 floppy_1316(struct bregs *regs, u8 drive)
703 floppy_ret(regs, DISK_RET_EPARAM);
706 floppy_ret(regs, DISK_RET_ECHANGED);
710 floppy_13XX(struct bregs *regs, u8 drive)
712 floppy_ret(regs, DISK_RET_EPARAM);
716 floppy_13(struct bregs *regs, u8 drive)
718 if (! CONFIG_FLOPPY_SUPPORT) {
721 case 0x01: floppy_1301(regs, drive); break;
722 default: floppy_13XX(regs, drive); break;
727 case 0x00: floppy_1300(regs, drive); break;
728 case 0x01: floppy_1301(regs, drive); break;
729 case 0x02: floppy_1302(regs, drive); break;
730 case 0x03: floppy_1303(regs, drive); break;
731 case 0x04: floppy_1304(regs, drive); break;
732 case 0x05: floppy_1305(regs, drive); break;
733 case 0x08: floppy_1308(regs, drive); break;
734 case 0x15: floppy_1315(regs, drive); break;
735 case 0x16: floppy_1316(regs, drive); break;
736 default: floppy_13XX(regs, drive); break;
740 // INT 0Eh Diskette Hardware ISR Entry Point
744 debug_isr(DEBUG_ISR_0e);
745 if (! CONFIG_FLOPPY_SUPPORT)
748 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
749 outb(0x08, PORT_FD_DATA); // sense interrupt status
750 while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
754 } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
756 // diskette interrupt has occurred
757 SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
763 // Called from int08 handler.
767 if (! CONFIG_FLOPPY_SUPPORT)
770 // time to turn off drive(s)?
771 u8 fcount = GET_BDA(floppy_motor_counter);
774 SET_BDA(floppy_motor_counter, fcount);
777 outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR);