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 GPLv3 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
24 struct floppy_ext_dbt_s diskette_param_table2 VISIBLE16 = {
27 .specify2 = 0x02, // head load time 0000001, DMA used
28 .shutoff_ticks = 0x25,
31 .interblock_len = 0x1B,
38 .max_track = 79, // maximum track
39 .data_rate = 0, // data transfer rate
40 .drive_type = 4, // drive type in cmos
47 if (! CONFIG_FLOPPY_SUPPORT)
49 dprintf(3, "init floppy drives\n");
51 // XXX - disable floppies on coreboot for now.
52 outb_cmos(0, CMOS_FLOPPY_DRIVE_TYPE);
53 u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
65 SET_BDA(floppy_harddisk_info, out);
67 // Update equipment word bits for floppy
68 if (num_floppies == 1)
69 // 1 drive, ready for boot
70 SETBITS_BDA(equipment_list_flags, 0x01);
71 else if (num_floppies == 2)
72 // 2 drives, ready for boot
73 SETBITS_BDA(equipment_list_flags, 0x41);
75 outb(0x02, PORT_DMA1_MASK_REG);
77 enable_hwirq(6, entry_0e);
81 set_diskette_current_cyl(u8 drive, u8 cyl)
84 SET_BDA(floppy_track1, cyl);
86 SET_BDA(floppy_track0, cyl);
90 get_drive_type(u8 drive)
92 // check CMOS to see if drive exists
93 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
102 floppy_media_known(u8 drive)
104 if (!(GET_BDA(floppy_recalibration_status) & (1<<drive)))
106 u8 v = GET_BDA(floppy_media_state[drive]);
107 if (!(v & FMS_MEDIA_DRIVE_ESTABLISHED))
113 floppy_reset_controller()
116 u8 val8 = inb(PORT_FD_DOR);
117 outb(val8 & ~0x04, PORT_FD_DOR);
118 outb(val8 | 0x04, PORT_FD_DOR);
120 // Wait for controller to come out of reset
121 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
126 floppy_prepare_controller(u8 drive)
128 CLEARBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
130 // turn on motor of selected drive, DMA & int enabled, normal operation
131 u8 prev_reset = inb(PORT_FD_DOR) & 0x04;
137 outb(dor, PORT_FD_DOR);
139 // reset the disk motor timeout value of INT 08
140 SET_BDA(floppy_motor_counter, BX_FLOPPY_ON_CNT);
142 // wait for drive readiness
143 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
146 if (prev_reset == 0) {
150 v = GET_BDA(floppy_recalibration_status);
158 SET_BDA(floppy_recalibration_status, v);
163 floppy_pio(u8 *cmd, u8 cmdlen)
165 floppy_prepare_controller(cmd[1] & 1);
167 // send command to controller
169 for (i=0; i<cmdlen; i++)
170 outb(cmd[i], PORT_FD_DATA);
175 if (!GET_BDA(floppy_motor_counter)) {
177 floppy_reset_controller();
180 v = GET_BDA(floppy_recalibration_status);
188 SET_BDA(floppy_recalibration_status, v);
193 #define floppy_ret(regs, code) \
194 __floppy_ret(__func__, __LINE__, (regs), (code))
197 __floppy_ret(const char *fname, int lineno, struct bregs *regs, u8 code)
199 SET_BDA(floppy_last_status, code);
201 __set_code_fail(fname, lineno, regs, code);
203 set_code_success(regs);
207 floppy_cmd(struct bregs *regs, u16 count, u8 *cmd, u8 cmdlen)
209 // es:bx = pointer to where to place information from diskette
210 u32 addr = (u32)MAKE_FARPTR(regs->es, regs->bx);
212 // check for 64K boundary overrun
213 u32 last_addr = addr + count;
214 if ((addr >> 16) != (last_addr >> 16)) {
215 floppy_ret(regs, DISK_RET_EBOUNDARY);
219 u8 mode_register = 0x4a; // single mode, increment, autoinit disable,
222 mode_register = 0x46;
224 //DEBUGF("floppy dma c2\n");
225 outb(0x06, PORT_DMA1_MASK_REG);
226 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
227 outb(addr, PORT_DMA_ADDR_2);
228 outb(addr>>8, PORT_DMA_ADDR_2);
229 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
230 outb(count, PORT_DMA_CNT_2);
231 outb(count>>8, PORT_DMA_CNT_2);
233 // port 0b: DMA-1 Mode Register
234 // transfer type=write, channel 2
235 outb(mode_register, PORT_DMA1_MODE_REG);
237 // port 81: DMA-1 Page Register, channel 2
238 outb(addr>>16, PORT_DMA_PAGE_2);
240 outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2
242 int ret = floppy_pio(cmd, cmdlen);
244 floppy_ret(regs, DISK_RET_ETIMEOUT);
248 // check port 3f4 for accessibility to status bytes
249 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
250 BX_PANIC("int13_diskette: ctrl not ready\n");
252 // read 7 return status bytes from controller
254 for (i=0; i<7; i++) {
255 u8 v = inb(PORT_FD_DATA);
257 SET_BDA(floppy_return_status[i], v);
264 floppy_drive_recal(u8 drive)
266 // send Recalibrate command (2 bytes) to controller
268 data[0] = 0x07; // 07: Recalibrate
269 data[1] = drive; // 0=drive0, 1=drive1
272 SETBITS_BDA(floppy_recalibration_status, 1<<drive);
273 set_diskette_current_cyl(drive, 0);
277 floppy_media_sense(u8 drive)
280 u8 config_data, media_state;
282 floppy_drive_recal(drive);
284 // for now cheat and get drive type from CMOS,
285 // assume media is same as drive type
288 // Bitfields for diskette media control:
289 // Bit(s) Description (Table M0028)
290 // 7-6 last data rate set by controller
291 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
292 // 5-4 last diskette drive step rate selected
293 // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
294 // 3-2 {data rate at start of operation}
298 // Bitfields for diskette drive media state:
299 // Bit(s) Description (Table M0030)
301 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
302 // 5 double stepping required (e.g. 360kB in 1.2MB)
303 // 4 media type established
304 // 3 drive capable of supporting 4MB media
305 // 2-0 on exit from BIOS, contains
306 // 000 trying 360kB in 360kB
307 // 001 trying 360kB in 1.2MB
308 // 010 trying 1.2MB in 1.2MB
309 // 011 360kB in 360kB established
310 // 100 360kB in 1.2MB established
311 // 101 1.2MB in 1.2MB established
313 // 111 all other formats/drives
315 switch (get_drive_type(drive)) {
318 config_data = 0x00; // 0000 0000
319 media_state = 0x25; // 0010 0101
323 // 1.2 MB 5.25" drive
324 config_data = 0x00; // 0000 0000
325 media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5)
330 config_data = 0x00; // 0000 0000 ???
331 media_state = 0x17; // 0001 0111
335 // 1.44 MB 3.5" drive
336 config_data = 0x00; // 0000 0000
337 media_state = 0x17; // 0001 0111
341 // 2.88 MB 3.5" drive
342 config_data = 0xCC; // 1100 1100
343 media_state = 0xD7; // 1101 0111
347 // Extended floppy size uses special cmos setting
350 config_data = 0x00; // 0000 0000
351 media_state = 0x27; // 0010 0111
356 config_data = 0x00; // 0000 0000
357 media_state = 0x27; // 0010 0111
362 config_data = 0x00; // 0000 0000
363 media_state = 0x27; // 0010 0111
368 config_data = 0x00; // 0000 0000
369 media_state = 0x00; // 0000 0000
373 SET_BDA(floppy_last_data_rate, config_data);
374 SET_BDA(floppy_media_state[drive], media_state);
379 check_drive(struct bregs *regs, u8 drive)
381 // see if drive exists
382 if (drive > 1 || !get_drive_type(drive)) {
383 // XXX - return type doesn't match
384 floppy_ret(regs, DISK_RET_ETIMEOUT);
388 // see if media in drive, and type is known
389 if (floppy_media_known(drive) == 0 && floppy_media_sense(drive) == 0) {
390 floppy_ret(regs, DISK_RET_EMEDIA);
396 // diskette controller reset
398 floppy_1300(struct bregs *regs, u8 drive)
401 floppy_ret(regs, DISK_RET_EPARAM);
404 if (!get_drive_type(drive)) {
405 floppy_ret(regs, DISK_RET_ETIMEOUT);
408 set_diskette_current_cyl(drive, 0); // current cylinder
409 floppy_ret(regs, DISK_RET_SUCCESS);
412 // Read Diskette Status
414 floppy_1301(struct bregs *regs, u8 drive)
416 u8 v = GET_BDA(floppy_last_status);
421 // Read Diskette Sectors
423 floppy_1302(struct bregs *regs, u8 drive)
425 if (check_drive(regs, drive))
428 u8 num_sectors = regs->al;
430 u8 sector = regs->cl;
433 if (head > 1 || sector == 0 || num_sectors == 0
434 || track > 79 || num_sectors > 72) {
435 floppy_ret(regs, DISK_RET_EPARAM);
439 // send read-normal-data command (9 bytes) to controller
441 data[0] = 0xe6; // e6: read normal data
442 data[1] = (head << 2) | drive; // HD DR1 DR2
446 data[5] = 2; // 512 byte sector size
447 data[6] = sector + num_sectors - 1; // last sector to read on track
448 data[7] = 0; // Gap length
449 data[8] = 0xff; // Gap length
451 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
455 if (data[0] & 0xc0) {
456 floppy_ret(regs, DISK_RET_ECONTROLLER);
460 // ??? should track be new val from return_status[3] ?
461 set_diskette_current_cyl(drive, track);
462 // AL = number of sectors read (same value as passed)
463 floppy_ret(regs, DISK_RET_SUCCESS);
466 regs->al = 0; // no sectors read
469 // Write Diskette Sectors
471 floppy_1303(struct bregs *regs, u8 drive)
473 if (check_drive(regs, drive))
476 u8 num_sectors = regs->al;
478 u8 sector = regs->cl;
481 if (head > 1 || sector == 0 || num_sectors == 0
482 || track > 79 || num_sectors > 72) {
483 floppy_ret(regs, DISK_RET_EPARAM);
487 // send write-normal-data command (9 bytes) to controller
489 data[0] = 0xc5; // c5: write normal data
490 data[1] = (head << 2) | drive; // HD DR1 DR2
494 data[5] = 2; // 512 byte sector size
495 data[6] = sector + num_sectors - 1; // last sector to write on track
496 data[7] = 0; // Gap length
497 data[8] = 0xff; // Gap length
499 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
503 if (data[0] & 0xc0) {
504 if (data[1] & 0x02) {
505 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
508 BX_PANIC("int13_diskette_function: read error\n");
511 // ??? should track be new val from return_status[3] ?
512 set_diskette_current_cyl(drive, track);
513 // AL = number of sectors read (same value as passed)
514 floppy_ret(regs, DISK_RET_SUCCESS);
517 regs->al = 0; // no sectors read
520 // Verify Diskette Sectors
522 floppy_1304(struct bregs *regs, u8 drive)
524 if (check_drive(regs, drive))
527 u8 num_sectors = regs->al;
529 u8 sector = regs->cl;
532 if (head > 1 || sector == 0 || num_sectors == 0
533 || track > 79 || num_sectors > 72) {
534 floppy_ret(regs, DISK_RET_EPARAM);
538 // ??? should track be new val from return_status[3] ?
539 set_diskette_current_cyl(drive, track);
540 // AL = number of sectors verified (same value as passed)
541 floppy_ret(regs, DISK_RET_SUCCESS);
544 regs->al = 0; // no sectors read
547 // format diskette track
549 floppy_1305(struct bregs *regs, u8 drive)
551 dprintf(3, "floppy f05\n");
553 if (check_drive(regs, drive))
556 u8 num_sectors = regs->al;
559 if (head > 1 || num_sectors == 0 || num_sectors > 18) {
560 floppy_ret(regs, DISK_RET_EPARAM);
564 // send format-track command (6 bytes) to controller
566 data[0] = 0x4d; // 4d: format track
567 data[1] = (head << 2) | drive; // HD DR1 DR2
568 data[2] = 2; // 512 byte sector size
569 data[3] = num_sectors; // number of sectors per track
570 data[4] = 0; // Gap length
571 data[5] = 0xf6; // Fill byte
573 int ret = floppy_cmd(regs, (num_sectors * 4) - 1, data, 6);
577 if (data[0] & 0xc0) {
578 if (data[1] & 0x02) {
579 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
582 BX_PANIC("int13_diskette_function: read error\n");
585 set_diskette_current_cyl(drive, 0);
589 // read diskette drive parameters
591 floppy_1308(struct bregs *regs, u8 drive)
593 dprintf(3, "floppy f08\n");
595 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
597 if (drive_type & 0xf0)
599 if (drive_type & 0x0f)
609 regs->dl = num_floppies;
620 regs->bl = drive_type;
623 regs->dl = num_floppies;
625 switch (drive_type) {
628 regs->dh = 0; // max head #
631 case 1: // 360KB, 5.25"
632 regs->cx = 0x2709; // 40 tracks, 9 sectors
633 regs->dh = 1; // max head #
636 case 2: // 1.2MB, 5.25"
637 regs->cx = 0x4f0f; // 80 tracks, 15 sectors
638 regs->dh = 1; // max head #
641 case 3: // 720KB, 3.5"
642 regs->cx = 0x4f09; // 80 tracks, 9 sectors
643 regs->dh = 1; // max head #
646 case 4: // 1.44MB, 3.5"
647 regs->cx = 0x4f12; // 80 tracks, 18 sectors
648 regs->dh = 1; // max head #
651 case 5: // 2.88MB, 3.5"
652 regs->cx = 0x4f24; // 80 tracks, 36 sectors
653 regs->dh = 1; // max head #
656 case 6: // 160k, 5.25"
657 regs->cx = 0x2708; // 40 tracks, 8 sectors
658 regs->dh = 0; // max head #
661 case 7: // 180k, 5.25"
662 regs->cx = 0x2709; // 40 tracks, 9 sectors
663 regs->dh = 0; // max head #
666 case 8: // 320k, 5.25"
667 regs->cx = 0x2708; // 40 tracks, 8 sectors
668 regs->dh = 1; // max head #
672 BX_PANIC("floppy: int13: bad floppy type\n");
675 /* set es & di to point to 11 byte diskette param table in ROM */
677 regs->di = (u32)&diskette_param_table2;
678 /* disk status not changed upon success */
682 // read diskette drive type
684 floppy_1315(struct bregs *regs, u8 drive)
686 dprintf(6, "floppy f15\n");
689 regs->ah = 0; // only 2 drives supported
690 // set_diskette_ret_status here ???
693 u8 drive_type = get_drive_type(drive);
695 regs->ah = (drive_type != 0);
699 // get diskette change line status
701 floppy_1316(struct bregs *regs, u8 drive)
704 floppy_ret(regs, DISK_RET_EPARAM);
707 floppy_ret(regs, DISK_RET_ECHANGED);
711 floppy_13XX(struct bregs *regs, u8 drive)
713 floppy_ret(regs, DISK_RET_EPARAM);
717 floppy_13(struct bregs *regs, u8 drive)
719 if (! CONFIG_FLOPPY_SUPPORT) {
722 case 0x01: floppy_1301(regs, drive); break;
723 default: floppy_13XX(regs, drive); break;
728 case 0x00: floppy_1300(regs, drive); break;
729 case 0x01: floppy_1301(regs, drive); break;
730 case 0x02: floppy_1302(regs, drive); break;
731 case 0x03: floppy_1303(regs, drive); break;
732 case 0x04: floppy_1304(regs, drive); break;
733 case 0x05: floppy_1305(regs, drive); break;
734 case 0x08: floppy_1308(regs, drive); break;
735 case 0x15: floppy_1315(regs, drive); break;
736 case 0x16: floppy_1316(regs, drive); break;
737 default: floppy_13XX(regs, drive); break;
741 // INT 0Eh Diskette Hardware ISR Entry Point
745 debug_isr(DEBUG_ISR_0e);
746 if (! CONFIG_FLOPPY_SUPPORT)
749 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
750 outb(0x08, PORT_FD_DATA); // sense interrupt status
751 while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
755 } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
757 // diskette interrupt has occurred
758 SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
764 // Called from int08 handler.
768 if (! CONFIG_FLOPPY_SUPPORT)
771 // time to turn off drive(s)?
772 u8 fcount = GET_BDA(floppy_motor_counter);
775 SET_BDA(floppy_motor_counter, fcount);
778 outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR);