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
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(__func__, __LINE__, (regs), (code))
195 __floppy_ret(const char *fname, int lineno, struct bregs *regs, u8 code)
197 SET_BDA(floppy_last_status, code);
199 __set_code_fail(fname, lineno, regs, code);
201 set_code_success(regs);
205 floppy_cmd(struct bregs *regs, u16 count, u8 *cmd, u8 cmdlen)
207 // es:bx = pointer to where to place information from diskette
208 u32 addr = (u32)MAKE_FARPTR(regs->es, regs->bx);
210 // check for 64K boundary overrun
211 u32 last_addr = addr + count;
212 if ((addr >> 16) != (last_addr >> 16)) {
213 floppy_ret(regs, DISK_RET_EBOUNDARY);
217 u8 mode_register = 0x4a; // single mode, increment, autoinit disable,
220 mode_register = 0x46;
222 //DEBUGF("floppy dma c2\n");
223 outb(0x06, PORT_DMA1_MASK_REG);
224 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
225 outb(addr, PORT_DMA_ADDR_2);
226 outb(addr>>8, PORT_DMA_ADDR_2);
227 outb(0x00, PORT_DMA1_CLEAR_FF_REG); // clear flip-flop
228 outb(count, PORT_DMA_CNT_2);
229 outb(count>>8, PORT_DMA_CNT_2);
231 // port 0b: DMA-1 Mode Register
232 // transfer type=write, channel 2
233 outb(mode_register, PORT_DMA1_MODE_REG);
235 // port 81: DMA-1 Page Register, channel 2
236 outb(addr>>16, PORT_DMA_PAGE_2);
238 outb(0x02, PORT_DMA1_MASK_REG); // unmask channel 2
240 int ret = floppy_pio(cmd, cmdlen);
242 floppy_ret(regs, DISK_RET_ETIMEOUT);
246 // check port 3f4 for accessibility to status bytes
247 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
248 BX_PANIC("int13_diskette: ctrl not ready\n");
250 // read 7 return status bytes from controller
252 for (i=0; i<7; i++) {
253 u8 v = inb(PORT_FD_DATA);
255 SET_BDA(floppy_return_status[i], v);
262 floppy_drive_recal(u8 drive)
264 // send Recalibrate command (2 bytes) to controller
266 data[0] = 0x07; // 07: Recalibrate
267 data[1] = drive; // 0=drive0, 1=drive1
270 SETBITS_BDA(floppy_recalibration_status, 1<<drive);
271 set_diskette_current_cyl(drive, 0);
275 floppy_media_sense(u8 drive)
278 u8 config_data, media_state;
280 floppy_drive_recal(drive);
282 // for now cheat and get drive type from CMOS,
283 // assume media is same as drive type
286 // Bitfields for diskette media control:
287 // Bit(s) Description (Table M0028)
288 // 7-6 last data rate set by controller
289 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
290 // 5-4 last diskette drive step rate selected
291 // 00=0Ch, 01=0Dh, 10=0Eh, 11=0Ah
292 // 3-2 {data rate at start of operation}
296 // Bitfields for diskette drive media state:
297 // Bit(s) Description (Table M0030)
299 // 00=500kbps, 01=300kbps, 10=250kbps, 11=1Mbps
300 // 5 double stepping required (e.g. 360kB in 1.2MB)
301 // 4 media type established
302 // 3 drive capable of supporting 4MB media
303 // 2-0 on exit from BIOS, contains
304 // 000 trying 360kB in 360kB
305 // 001 trying 360kB in 1.2MB
306 // 010 trying 1.2MB in 1.2MB
307 // 011 360kB in 360kB established
308 // 100 360kB in 1.2MB established
309 // 101 1.2MB in 1.2MB established
311 // 111 all other formats/drives
313 switch (get_drive_type(drive)) {
316 config_data = 0x00; // 0000 0000
317 media_state = 0x25; // 0010 0101
321 // 1.2 MB 5.25" drive
322 config_data = 0x00; // 0000 0000
323 media_state = 0x25; // 0010 0101 // need double stepping??? (bit 5)
328 config_data = 0x00; // 0000 0000 ???
329 media_state = 0x17; // 0001 0111
333 // 1.44 MB 3.5" drive
334 config_data = 0x00; // 0000 0000
335 media_state = 0x17; // 0001 0111
339 // 2.88 MB 3.5" drive
340 config_data = 0xCC; // 1100 1100
341 media_state = 0xD7; // 1101 0111
345 // Extended floppy size uses special cmos setting
348 config_data = 0x00; // 0000 0000
349 media_state = 0x27; // 0010 0111
354 config_data = 0x00; // 0000 0000
355 media_state = 0x27; // 0010 0111
360 config_data = 0x00; // 0000 0000
361 media_state = 0x27; // 0010 0111
366 config_data = 0x00; // 0000 0000
367 media_state = 0x00; // 0000 0000
371 SET_BDA(floppy_last_data_rate, config_data);
372 SET_BDA(floppy_media_state[drive], media_state);
377 check_drive(struct bregs *regs, u8 drive)
379 // see if drive exists
380 if (drive > 1 || !get_drive_type(drive)) {
381 // XXX - return type doesn't match
382 floppy_ret(regs, DISK_RET_ETIMEOUT);
386 // see if media in drive, and type is known
387 if (floppy_media_known(drive) == 0 && floppy_media_sense(drive) == 0) {
388 floppy_ret(regs, DISK_RET_EMEDIA);
394 // diskette controller reset
396 floppy_1300(struct bregs *regs, u8 drive)
399 floppy_ret(regs, DISK_RET_EPARAM);
402 if (!get_drive_type(drive)) {
403 floppy_ret(regs, DISK_RET_ETIMEOUT);
406 set_diskette_current_cyl(drive, 0); // current cylinder
407 floppy_ret(regs, DISK_RET_SUCCESS);
410 // Read Diskette Status
412 floppy_1301(struct bregs *regs, u8 drive)
414 u8 v = GET_BDA(floppy_last_status);
419 // Read Diskette Sectors
421 floppy_1302(struct bregs *regs, u8 drive)
423 if (check_drive(regs, drive))
426 u8 num_sectors = regs->al;
428 u8 sector = regs->cl;
431 if (head > 1 || sector == 0 || num_sectors == 0
432 || track > 79 || num_sectors > 72) {
433 floppy_ret(regs, DISK_RET_EPARAM);
437 // send read-normal-data command (9 bytes) to controller
439 data[0] = 0xe6; // e6: read normal data
440 data[1] = (head << 2) | drive; // HD DR1 DR2
444 data[5] = 2; // 512 byte sector size
445 data[6] = sector + num_sectors - 1; // last sector to read on track
446 data[7] = 0; // Gap length
447 data[8] = 0xff; // Gap length
449 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
453 if (data[0] & 0xc0) {
454 floppy_ret(regs, DISK_RET_ECONTROLLER);
458 // ??? should track be new val from return_status[3] ?
459 set_diskette_current_cyl(drive, track);
460 // AL = number of sectors read (same value as passed)
461 floppy_ret(regs, DISK_RET_SUCCESS);
464 regs->al = 0; // no sectors read
467 // Write Diskette Sectors
469 floppy_1303(struct bregs *regs, u8 drive)
471 if (check_drive(regs, drive))
474 u8 num_sectors = regs->al;
476 u8 sector = regs->cl;
479 if (head > 1 || sector == 0 || num_sectors == 0
480 || track > 79 || num_sectors > 72) {
481 floppy_ret(regs, DISK_RET_EPARAM);
485 // send write-normal-data command (9 bytes) to controller
487 data[0] = 0xc5; // c5: write normal data
488 data[1] = (head << 2) | drive; // HD DR1 DR2
492 data[5] = 2; // 512 byte sector size
493 data[6] = sector + num_sectors - 1; // last sector to write on track
494 data[7] = 0; // Gap length
495 data[8] = 0xff; // Gap length
497 int ret = floppy_cmd(regs, (num_sectors * 512) - 1, data, 9);
501 if (data[0] & 0xc0) {
502 if (data[1] & 0x02) {
503 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
506 BX_PANIC("int13_diskette_function: read error\n");
509 // ??? should track be new val from return_status[3] ?
510 set_diskette_current_cyl(drive, track);
511 // AL = number of sectors read (same value as passed)
512 floppy_ret(regs, DISK_RET_SUCCESS);
515 regs->al = 0; // no sectors read
518 // Verify Diskette Sectors
520 floppy_1304(struct bregs *regs, u8 drive)
522 if (check_drive(regs, drive))
525 u8 num_sectors = regs->al;
527 u8 sector = regs->cl;
530 if (head > 1 || sector == 0 || num_sectors == 0
531 || track > 79 || num_sectors > 72) {
532 floppy_ret(regs, DISK_RET_EPARAM);
536 // ??? should track be new val from return_status[3] ?
537 set_diskette_current_cyl(drive, track);
538 // AL = number of sectors verified (same value as passed)
539 floppy_ret(regs, DISK_RET_SUCCESS);
542 regs->al = 0; // no sectors read
545 // format diskette track
547 floppy_1305(struct bregs *regs, u8 drive)
549 dprintf(3, "floppy f05\n");
551 if (check_drive(regs, drive))
554 u8 num_sectors = regs->al;
557 if (head > 1 || num_sectors == 0 || num_sectors > 18) {
558 floppy_ret(regs, DISK_RET_EPARAM);
562 // send format-track command (6 bytes) to controller
564 data[0] = 0x4d; // 4d: format track
565 data[1] = (head << 2) | drive; // HD DR1 DR2
566 data[2] = 2; // 512 byte sector size
567 data[3] = num_sectors; // number of sectors per track
568 data[4] = 0; // Gap length
569 data[5] = 0xf6; // Fill byte
571 int ret = floppy_cmd(regs, (num_sectors * 4) - 1, data, 6);
575 if (data[0] & 0xc0) {
576 if (data[1] & 0x02) {
577 floppy_ret(regs, DISK_RET_EWRITEPROTECT);
580 BX_PANIC("int13_diskette_function: read error\n");
583 set_diskette_current_cyl(drive, 0);
587 // read diskette drive parameters
589 floppy_1308(struct bregs *regs, u8 drive)
591 dprintf(3, "floppy f08\n");
593 u8 drive_type = inb_cmos(CMOS_FLOPPY_DRIVE_TYPE);
595 if (drive_type & 0xf0)
597 if (drive_type & 0x0f)
607 regs->dl = num_floppies;
618 regs->bl = drive_type;
621 regs->dl = num_floppies;
623 switch (drive_type) {
626 regs->dh = 0; // max head #
629 case 1: // 360KB, 5.25"
630 regs->cx = 0x2709; // 40 tracks, 9 sectors
631 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 #
639 case 3: // 720KB, 3.5"
640 regs->cx = 0x4f09; // 80 tracks, 9 sectors
641 regs->dh = 1; // max head #
644 case 4: // 1.44MB, 3.5"
645 regs->cx = 0x4f12; // 80 tracks, 18 sectors
646 regs->dh = 1; // max head #
649 case 5: // 2.88MB, 3.5"
650 regs->cx = 0x4f24; // 80 tracks, 36 sectors
651 regs->dh = 1; // max head #
654 case 6: // 160k, 5.25"
655 regs->cx = 0x2708; // 40 tracks, 8 sectors
656 regs->dh = 0; // max head #
659 case 7: // 180k, 5.25"
660 regs->cx = 0x2709; // 40 tracks, 9 sectors
661 regs->dh = 0; // max head #
664 case 8: // 320k, 5.25"
665 regs->cx = 0x2708; // 40 tracks, 8 sectors
666 regs->dh = 1; // max head #
670 BX_PANIC("floppy: int13: bad floppy type\n");
673 /* set es & di to point to 11 byte diskette param table in ROM */
675 regs->di = (u32)&diskette_param_table2;
676 /* disk status not changed upon success */
680 // read diskette drive type
682 floppy_1315(struct bregs *regs, u8 drive)
684 dprintf(6, "floppy f15\n");
687 regs->ah = 0; // only 2 drives supported
688 // set_diskette_ret_status here ???
691 u8 drive_type = get_drive_type(drive);
693 regs->ah = (drive_type != 0);
697 // get diskette change line status
699 floppy_1316(struct bregs *regs, u8 drive)
702 floppy_ret(regs, DISK_RET_EPARAM);
705 floppy_ret(regs, DISK_RET_ECHANGED);
709 floppy_13XX(struct bregs *regs, u8 drive)
711 floppy_ret(regs, DISK_RET_EPARAM);
715 floppy_13(struct bregs *regs, u8 drive)
717 if (! CONFIG_FLOPPY_SUPPORT) {
720 case 0x01: floppy_1301(regs, drive); break;
721 default: floppy_13XX(regs, drive); break;
726 case 0x00: floppy_1300(regs, drive); break;
727 case 0x01: floppy_1301(regs, drive); break;
728 case 0x02: floppy_1302(regs, drive); break;
729 case 0x03: floppy_1303(regs, drive); break;
730 case 0x04: floppy_1304(regs, drive); break;
731 case 0x05: floppy_1305(regs, drive); break;
732 case 0x08: floppy_1308(regs, drive); break;
733 case 0x15: floppy_1315(regs, drive); break;
734 case 0x16: floppy_1316(regs, drive); break;
735 default: floppy_13XX(regs, drive); break;
739 // INT 0Eh Diskette Hardware ISR Entry Point
743 debug_isr(DEBUG_ISR_0e);
744 if (! CONFIG_FLOPPY_SUPPORT)
747 if ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0) {
748 outb(0x08, PORT_FD_DATA); // sense interrupt status
749 while ((inb(PORT_FD_STATUS) & 0xc0) != 0xc0)
753 } while ((inb(PORT_FD_STATUS) & 0xc0) == 0xc0);
755 // diskette interrupt has occurred
756 SETBITS_BDA(floppy_recalibration_status, FRS_TIMEOUT);
762 // Called from int08 handler.
766 if (! CONFIG_FLOPPY_SUPPORT)
769 // time to turn off drive(s)?
770 u8 fcount = GET_BDA(floppy_motor_counter);
773 SET_BDA(floppy_motor_counter, fcount);
776 outb(inb(PORT_FD_DOR) & 0xcf, PORT_FD_DOR);