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
42 // Since no provisions are made for multiple drive types, most
43 // values in this table are ignored. I set parameters for 1.44M
45 struct floppy_dbt_s diskette_param_table VAR16FIXED(0xefc7) = {
47 .specify2 = 0x02, // head load time 0000001, DMA used
48 .shutoff_ticks = 0x25,
51 .interblock_len = 0x1B,
59 u8 FloppyCount VAR16_32;
60 u8 FloppyTypes[2] VAR16_32;
65 if (! CONFIG_FLOPPY_SUPPORT)
67 dprintf(3, "init floppy drives\n");
69 FloppyTypes[0] = FloppyTypes[1] = 0;
72 if (CONFIG_COREBOOT) {
73 // XXX - disable floppies on coreboot for now.
75 u8 type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
78 FloppyTypes[0] = type >> 4;
83 FloppyTypes[1] = type & 0x0f;
87 SET_BDA(floppy_harddisk_info, out);
89 // Update equipment word bits for floppy
91 // 1 drive, ready for boot
92 SETBITS_BDA(equipment_list_flags, 0x01);
93 else if (FloppyCount == 2)
94 // 2 drives, ready for boot
95 SETBITS_BDA(equipment_list_flags, 0x41);
97 outb(0x02, PORT_DMA1_MASK_REG);
99 enable_hwirq(6, entry_0e);
103 set_diskette_current_cyl(u8 drive, u8 cyl)
106 SET_BDA(floppy_track1, cyl);
108 SET_BDA(floppy_track0, cyl);
112 floppy_media_known(u8 drive)
114 if (!(GET_BDA(floppy_recalibration_status) & (1<<drive)))
116 u8 v = GET_BDA(floppy_media_state[drive]);
117 if (!(v & FMS_MEDIA_DRIVE_ESTABLISHED))
123 floppy_reset_controller()
126 u8 val8 = inb(PORT_FD_DOR);
127 outb(val8 & ~0x04, PORT_FD_DOR);
128 outb(val8 | 0x04, PORT_FD_DOR);
130 // Wait for controller to come out of reset
131 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
136 floppy_prepare_controller(u8 drive)
138 CLEARBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
140 // turn on motor of selected drive, DMA & int enabled, normal operation
141 u8 prev_reset = inb(PORT_FD_DOR) & 0x04;
147 outb(dor, PORT_FD_DOR);
149 // reset the disk motor timeout value of INT 08
150 SET_BDA(floppy_motor_counter, BX_FLOPPY_ON_CNT);
152 // wait for drive readiness
153 while ((inb(PORT_FD_STATUS) & 0xc0) != 0x80)
156 if (prev_reset == 0) {
160 v = GET_BDA(floppy_recalibration_status);
168 SET_BDA(floppy_recalibration_status, v);
173 floppy_pio(u8 *cmd, u8 cmdlen)
175 floppy_prepare_controller(cmd[1] & 1);
177 // send command to controller
179 for (i=0; i<cmdlen; i++)
180 outb(cmd[i], PORT_FD_DATA);
185 if (!GET_BDA(floppy_motor_counter)) {
187 floppy_reset_controller();
190 v = GET_BDA(floppy_recalibration_status);
198 SET_BDA(floppy_recalibration_status, v);
203 #define floppy_ret(regs, code) \
204 __floppy_ret((regs), (code) | (__LINE__ << 8), __func__)
207 __floppy_ret(struct bregs *regs, u32 linecode, const char *fname)
210 SET_BDA(floppy_last_status, code);
212 __set_code_fail(regs, linecode, fname);
214 set_code_success(regs);
218 floppy_cmd(struct bregs *regs, u16 count, u8 *cmd, u8 cmdlen)
220 // es:bx = pointer to where to place information from diskette
221 u32 addr = (u32)MAKE_FLATPTR(regs->es, regs->bx);
223 // check for 64K boundary overrun
224 u32 last_addr = addr + count;
225 if ((addr >> 16) != (last_addr >> 16)) {
226 floppy_ret(regs, DISK_RET_EBOUNDARY);
230 u8 mode_register = 0x4a; // single mode, increment, autoinit disable,
233 mode_register = 0x46;
235 //DEBUGF("floppy dma c2\n");
236 outb(0x06, PORT_DMA1_MASK_REG);
237 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
238 outb(addr, PORT_DMA_ADDR_2);
239 outb(addr>>8, PORT_DMA_ADDR_2);
240 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
241 outb(count, PORT_DMA_CNT_2);
242 outb(count>>8, PORT_DMA_CNT_2);
244 // port 0b: DMA-1 Mode Register
245 // transfer type=write, channel 2
246 outb(mode_register, PORT_DMA1_MODE_REG);
248 // port 81: DMA-1 Page Register, channel 2
249 outb(addr>>16, PORT_DMA_PAGE_2);
251 outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2
253 int ret = floppy_pio(cmd, cmdlen);
255 floppy_ret(regs, DISK_RET_ETIMEOUT);
259 // check port 3f4 for accessibility to status bytes
260 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
261 floppy_ret(regs, DISK_RET_ECONTROLLER);
265 // read 7 return status bytes from controller
267 for (i=0; i<7; i++) {
268 u8 v = inb(PORT_FD_DATA);
270 SET_BDA(floppy_return_status[i], v);
277 floppy_drive_recal(u8 drive)
279 // send Recalibrate command (2 bytes) to controller
281 data[0] = 0x07; // 07: Recalibrate
282 data[1] = drive; // 0=drive0, 1=drive1
285 SETBITS_BDA(floppy_recalibration_status, 1<<drive);
286 set_diskette_current_cyl(drive, 0);
290 floppy_media_sense(u8 drive)
293 u8 config_data, media_state;
295 floppy_drive_recal(drive);
297 // for now cheat and get drive type from CMOS,
298 // assume media is same as drive type
301 // Bitfields for diskette media control:
302 // Bit(s) Description (Table M0028)
303 // 7-6 last data rate set by controller
304 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
305 // 5-4 last diskette drive step rate selected
306 // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
307 // 3-2 {data rate at start of operation}
311 // Bitfields for diskette drive media state:
312 // Bit(s) Description (Table M0030)
314 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
315 // 5 double stepping required (e.g. 360kB in 1.2MB)
316 // 4 media type established
317 // 3 drive capable of supporting 4MB media
318 // 2-0 on exit from BIOS, contains
319 // 000 trying 360kB in 360kB
320 // 001 trying 360kB in 1.2MB
321 // 010 trying 1.2MB in 1.2MB
322 // 011 360kB in 360kB established
323 // 100 360kB in 1.2MB established
324 // 101 1.2MB in 1.2MB established
326 // 111 all other formats/drives
328 switch (GET_GLOBAL(FloppyTypes[drive])) {
331 config_data = 0x00; // 0000 0000
332 media_state = 0x25; // 0010 0101
336 // 1.2 MB 5.25" drive
337 config_data = 0x00; // 0000 0000
338 media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5)
343 config_data = 0x00; // 0000 0000 ???
344 media_state = 0x17; // 0001 0111
348 // 1.44 MB 3.5" drive
349 config_data = 0x00; // 0000 0000
350 media_state = 0x17; // 0001 0111
354 // 2.88 MB 3.5" drive
355 config_data = 0xCC; // 1100 1100
356 media_state = 0xD7; // 1101 0111
360 // Extended floppy size uses special cmos setting
363 config_data = 0x00; // 0000 0000
364 media_state = 0x27; // 0010 0111
369 config_data = 0x00; // 0000 0000
370 media_state = 0x27; // 0010 0111
375 config_data = 0x00; // 0000 0000
376 media_state = 0x27; // 0010 0111
381 config_data = 0x00; // 0000 0000
382 media_state = 0x00; // 0000 0000
386 SET_BDA(floppy_last_data_rate, config_data);
387 SET_BDA(floppy_media_state[drive], media_state);
392 check_drive(struct bregs *regs, u8 drive)
394 // see if drive exists
395 if (drive > 1 || !GET_GLOBAL(FloppyTypes[drive])) {
396 // XXX - return type doesn't match
397 floppy_ret(regs, DISK_RET_ETIMEOUT);
401 // see if media in drive, and type is known
402 if (floppy_media_known(drive) == 0 && floppy_media_sense(drive) == 0) {
403 floppy_ret(regs, DISK_RET_EMEDIA);
409 // diskette controller reset
411 floppy_1300(struct bregs *regs, u8 drive)
414 floppy_ret(regs, DISK_RET_EPARAM);
417 if (!GET_GLOBAL(FloppyTypes[drive])) {
418 floppy_ret(regs, DISK_RET_ETIMEOUT);
421 set_diskette_current_cyl(drive, 0); // current cylinder
422 floppy_ret(regs, DISK_RET_SUCCESS);
425 // Read Diskette Status
427 floppy_1301(struct bregs *regs, u8 drive)
429 u8 v = GET_BDA(floppy_last_status);
434 // Read Diskette Sectors
436 floppy_1302(struct bregs *regs, u8 drive)
438 if (check_drive(regs, drive))
441 u8 num_sectors = regs->al;
443 u8 sector = regs->cl;
446 if (head > 1 || sector == 0 || num_sectors == 0
447 || track > 79 || num_sectors > 72) {
448 floppy_ret(regs, DISK_RET_EPARAM);
452 // send read-normal-data command (9 bytes) to controller
454 data[0] = 0xe6; // e6: read normal data
455 data[1] = (head << 2) | drive; // HD DR1 DR2
459 data[5] = 2; // 512 byte sector size
460 data[6] = sector + num_sectors - 1; // last sector to read on track
461 data[7] = 0; // Gap length
462 data[8] = 0xff; // Gap length
464 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
468 if (data[0] & 0xc0) {
469 floppy_ret(regs, DISK_RET_ECONTROLLER);
473 // ??? should track be new val from return_status[3] ?
474 set_diskette_current_cyl(drive, track);
475 // AL = number of sectors read (same value as passed)
476 floppy_ret(regs, DISK_RET_SUCCESS);
479 regs->al = 0; // no sectors read
482 // Write Diskette Sectors
484 floppy_1303(struct bregs *regs, u8 drive)
486 if (check_drive(regs, drive))
489 u8 num_sectors = regs->al;
491 u8 sector = regs->cl;
494 if (head > 1 || sector == 0 || num_sectors == 0
495 || track > 79 || num_sectors > 72) {
496 floppy_ret(regs, DISK_RET_EPARAM);
500 // send write-normal-data command (9 bytes) to controller
502 data[0] = 0xc5; // c5: write normal data
503 data[1] = (head << 2) | drive; // HD DR1 DR2
507 data[5] = 2; // 512 byte sector size
508 data[6] = sector + num_sectors - 1; // last sector to write on track
509 data[7] = 0; // Gap length
510 data[8] = 0xff; // Gap length
512 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
516 if (data[0] & 0xc0) {
518 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
520 floppy_ret(regs, DISK_RET_ECONTROLLER);
524 // ??? should track be new val from return_status[3] ?
525 set_diskette_current_cyl(drive, track);
526 // AL = number of sectors read (same value as passed)
527 floppy_ret(regs, DISK_RET_SUCCESS);
530 regs->al = 0; // no sectors read
533 // Verify Diskette Sectors
535 floppy_1304(struct bregs *regs, u8 drive)
537 if (check_drive(regs, drive))
540 u8 num_sectors = regs->al;
542 u8 sector = regs->cl;
545 if (head > 1 || sector == 0 || num_sectors == 0
546 || track > 79 || num_sectors > 72) {
547 floppy_ret(regs, DISK_RET_EPARAM);
551 // ??? should track be new val from return_status[3] ?
552 set_diskette_current_cyl(drive, track);
553 // AL = number of sectors verified (same value as passed)
554 floppy_ret(regs, DISK_RET_SUCCESS);
557 regs->al = 0; // no sectors read
560 // format diskette track
562 floppy_1305(struct bregs *regs, u8 drive)
564 dprintf(3, "floppy f05\n");
566 if (check_drive(regs, drive))
569 u8 num_sectors = regs->al;
572 if (head > 1 || num_sectors == 0 || num_sectors > 18) {
573 floppy_ret(regs, DISK_RET_EPARAM);
577 // send format-track command (6 bytes) to controller
579 data[0] = 0x4d; // 4d: format track
580 data[1] = (head << 2) | drive; // HD DR1 DR2
581 data[2] = 2; // 512 byte sector size
582 data[3] = num_sectors; // number of sectors per track
583 data[4] = 0; // Gap length
584 data[5] = 0xf6; // Fill byte
586 int ret = floppy_cmd(regs, (num_sectors * 4) - 1, data, 6);
590 if (data[0] & 0xc0) {
592 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
594 floppy_ret(regs, DISK_RET_ECONTROLLER);
598 set_diskette_current_cyl(drive, 0);
602 // read diskette drive parameters
604 floppy_1308(struct bregs *regs, u8 drive)
606 dprintf(3, "floppy f08\n");
609 regs->dx = GET_GLOBAL(FloppyCount);
619 u8 drive_type = GET_GLOBAL(FloppyTypes[drive]);
620 regs->bx = drive_type;
622 switch (drive_type) {
624 dprintf(1, "floppy: int13: bad floppy type\n");
628 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 #
634 case 2: // 1.2MB, 5.25"
635 regs->cx = 0x4f0f; // 80 tracks, 15 sectors
636 regs->dh = 1; // max head #
638 case 3: // 720KB, 3.5"
639 regs->cx = 0x4f09; // 80 tracks, 9 sectors
640 regs->dh = 1; // max head #
642 case 4: // 1.44MB, 3.5"
643 regs->cx = 0x4f12; // 80 tracks, 18 sectors
644 regs->dh = 1; // max head #
646 case 5: // 2.88MB, 3.5"
647 regs->cx = 0x4f24; // 80 tracks, 36 sectors
648 regs->dh = 1; // max head #
650 case 6: // 160k, 5.25"
651 regs->cx = 0x2708; // 40 tracks, 8 sectors
652 regs->dh = 0; // max head #
654 case 7: // 180k, 5.25"
655 regs->cx = 0x2709; // 40 tracks, 9 sectors
656 regs->dh = 0; // max head #
658 case 8: // 320k, 5.25"
659 regs->cx = 0x2708; // 40 tracks, 8 sectors
660 regs->dh = 1; // max head #
664 /* set es & di to point to 11 byte diskette param table in ROM */
666 regs->di = (u32)&diskette_param_table2;
667 /* disk status not changed upon success */
671 // read diskette drive type
673 floppy_1315(struct bregs *regs, u8 drive)
675 dprintf(6, "floppy f15\n");
678 regs->ah = 0; // only 2 drives supported
679 // set_diskette_ret_status here ???
682 u8 drive_type = GET_GLOBAL(FloppyTypes[drive]);
684 regs->ah = (drive_type != 0);
688 // get diskette change line status
690 floppy_1316(struct bregs *regs, u8 drive)
693 floppy_ret(regs, DISK_RET_EPARAM);
696 floppy_ret(regs, DISK_RET_ECHANGED);
700 floppy_13XX(struct bregs *regs, u8 drive)
702 floppy_ret(regs, DISK_RET_EPARAM);
706 floppy_13(struct bregs *regs, u8 drive)
708 if (! CONFIG_FLOPPY_SUPPORT) {
711 case 0x01: floppy_1301(regs, drive); break;
712 default: floppy_13XX(regs, drive); break;
717 case 0x00: floppy_1300(regs, drive); break;
718 case 0x01: floppy_1301(regs, drive); break;
719 case 0x02: floppy_1302(regs, drive); break;
720 case 0x03: floppy_1303(regs, drive); break;
721 case 0x04: floppy_1304(regs, drive); break;
722 case 0x05: floppy_1305(regs, drive); break;
723 case 0x08: floppy_1308(regs, drive); break;
724 case 0x15: floppy_1315(regs, drive); break;
725 case 0x16: floppy_1316(regs, drive); break;
726 default: floppy_13XX(regs, drive); break;
730 // INT 0Eh Diskette Hardware ISR Entry Point
734 debug_isr(DEBUG_ISR_0e);
735 if (! CONFIG_FLOPPY_SUPPORT)
738 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
739 outb(0x08, PORT_FD_DATA); // sense interrupt status
740 while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
744 } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
746 // diskette interrupt has occurred
747 SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
753 // Called from int08 handler.
757 if (! CONFIG_FLOPPY_SUPPORT)
760 // time to turn off drive(s)?
761 u8 fcount = GET_BDA(floppy_motor_counter);
764 SET_BDA(floppy_motor_counter, fcount);
767 outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR);