1 // Low level ATA disk access
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 "ioport.h" // inb
10 #include "util.h" // dprintf
11 #include "cmos.h" // inb_cmos
12 #include "pic.h" // enable_hwirq
13 #include "biosvar.h" // GET_EBDA
14 #include "pci.h" // pci_find_class
15 #include "pci_ids.h" // PCI_CLASS_STORAGE_OTHER
16 #include "pci_regs.h" // PCI_INTERRUPT_LINE
17 #include "disk.h" // struct ata_s
18 #include "atabits.h" // ATA_CB_STAT
24 #define NOT_BSY_NOT_DRQ 4
27 #define IDE_SECTOR_SIZE 512
28 #define CDROM_SECTOR_SIZE 2048
30 #define IDE_TIMEOUT 32000u //32 seconds max for IDE ops
32 struct ata_s ATA VAR16_32;
35 /****************************************************************
37 ****************************************************************/
39 // Wait for the specified ide state
41 await_ide(u8 mask, u8 flags, u16 base, u16 timeout)
43 u64 end = calc_future_tsc(timeout);
45 u8 status = inb(base+ATA_CB_STAT);
46 if ((status & mask) == flags)
48 if (rdtscll() >= end) {
49 dprintf(1, "IDE time out\n");
55 // Wait for the device to be not-busy.
57 await_not_bsy(u16 base)
59 return await_ide(ATA_CB_STAT_BSY, 0, base, IDE_TIMEOUT);
62 // Wait for the device to be ready.
66 return await_ide(ATA_CB_STAT_RDY, ATA_CB_STAT_RDY, base, IDE_TIMEOUT);
69 // Wait for ide state - pauses for one ata cycle first.
70 static __always_inline int
71 pause_await_not_bsy(u16 iobase1, u16 iobase2)
73 // Wait one PIO transfer cycle.
74 inb(iobase2 + ATA_CB_ASTAT);
76 return await_not_bsy(iobase1);
79 // Wait for ide state - pause for 400ns first.
80 static __always_inline int
81 ndelay_await_not_bsy(u16 iobase1)
84 return await_not_bsy(iobase1);
89 ata_reset(int driveid)
91 u8 channel = driveid / 2;
92 u8 slave = driveid % 2;
93 u16 iobase1 = GET_GLOBAL(ATA.channels[channel].iobase1);
94 u16 iobase2 = GET_GLOBAL(ATA.channels[channel].iobase2);
96 dprintf(6, "ata_reset driveid=%d\n", driveid);
98 outb(ATA_CB_DC_HD15 | ATA_CB_DC_NIEN | ATA_CB_DC_SRST, iobase2+ATA_CB_DC);
100 outb(ATA_CB_DC_HD15 | ATA_CB_DC_NIEN, iobase2+ATA_CB_DC);
103 // wait for device to become not busy.
104 int status = await_not_bsy(iobase1);
109 u64 end = calc_future_tsc(IDE_TIMEOUT);
111 outb(ATA_CB_DH_DEV1, iobase1 + ATA_CB_DH);
112 status = await_not_bsy(iobase1);
115 if (inb(iobase1 + ATA_CB_DH) == ATA_CB_DH_DEV1)
117 // Change drive request failed to take effect - retry.
118 if (rdtscll() >= end) {
119 dprintf(1, "ata_reset slave time out\n");
125 // On a user-reset request, wait for RDY if it is an ATA device.
126 u8 type=GET_GLOBAL(ATA.devices[driveid].type);
127 if (type == ATA_TYPE_ATA)
128 status = await_rdy(iobase1);
132 outb(ATA_CB_DC_HD15, iobase2+ATA_CB_DC);
134 dprintf(6, "ata_reset exit status=%x\n", status);
138 /****************************************************************
140 ****************************************************************/
142 struct ata_pio_command {
157 // Send an ata command to the drive.
159 send_cmd(int driveid, struct ata_pio_command *cmd)
161 u8 channel = driveid / 2;
162 u8 slave = driveid % 2;
163 u16 iobase1 = GET_GLOBAL(ATA.channels[channel].iobase1);
164 u16 iobase2 = GET_GLOBAL(ATA.channels[channel].iobase2);
166 // Disable interrupts
167 outb(ATA_CB_DC_HD15 | ATA_CB_DC_NIEN, iobase2 + ATA_CB_DC);
170 int status = await_not_bsy(iobase1);
173 u8 newdh = ((cmd->device & ~ATA_CB_DH_DEV1)
174 | (slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0));
175 u8 olddh = inb(iobase1 + ATA_CB_DH);
176 outb(newdh, iobase1 + ATA_CB_DH);
177 if ((olddh ^ newdh) & (1<<4)) {
178 // Was a device change - wait for device to become not busy.
179 status = await_not_bsy(iobase1);
184 if (cmd->command & 0x04) {
185 outb(0x00, iobase1 + ATA_CB_FR);
186 outb(cmd->sector_count2, iobase1 + ATA_CB_SC);
187 outb(cmd->lba_low2, iobase1 + ATA_CB_SN);
188 outb(cmd->lba_mid2, iobase1 + ATA_CB_CL);
189 outb(cmd->lba_high2, iobase1 + ATA_CB_CH);
191 outb(cmd->feature, iobase1 + ATA_CB_FR);
192 outb(cmd->sector_count, iobase1 + ATA_CB_SC);
193 outb(cmd->lba_low, iobase1 + ATA_CB_SN);
194 outb(cmd->lba_mid, iobase1 + ATA_CB_CL);
195 outb(cmd->lba_high, iobase1 + ATA_CB_CH);
196 outb(cmd->command, iobase1 + ATA_CB_CMD);
198 status = ndelay_await_not_bsy(iobase1);
202 if (status & ATA_CB_STAT_ERR) {
203 dprintf(6, "send_cmd : read error (status=%02x err=%02x)\n"
204 , status, inb(iobase1 + ATA_CB_ERR));
207 if (!(status & ATA_CB_STAT_DRQ)) {
208 dprintf(6, "send_cmd : DRQ not set (status %02x)\n", status);
216 /****************************************************************
218 ****************************************************************/
220 // Read and discard x number of bytes from an io channel.
222 insx_discard(int mode, int iobase1, int bytes)
225 if (mode == ATA_MODE_PIO32) {
227 for (i=0; i<count; i++)
231 for (i=0; i<count; i++)
236 // Transfer 'count' blocks (of 'blocksize' bytes) to/from drive
237 // 'driveid'. If 'skipfirst' or 'skiplast' is set then the first
238 // and/or last block may be partially transferred. This function is
239 // inlined because all the callers use different forms and because the
240 // large number of parameters would consume a lot of stack space.
241 static __always_inline int
242 ata_transfer(int driveid, int iswrite, int count, int blocksize
243 , int skipfirst, int skiplast, void *buf_fl)
245 dprintf(16, "ata_transfer id=%d write=%d count=%d bs=%d"
246 " skipf=%d skipl=%d buf=%p\n"
247 , driveid, iswrite, count, blocksize
248 , skipfirst, skiplast, buf_fl);
250 // Reset count of transferred data
251 SET_EBDA(sector_count, 0);
253 u8 channel = driveid / 2;
254 u16 iobase1 = GET_GLOBAL(ATA.channels[channel].iobase1);
255 u16 iobase2 = GET_GLOBAL(ATA.channels[channel].iobase2);
256 u8 mode = GET_GLOBAL(ATA.devices[driveid].mode);
260 int bsize = blocksize;
261 if (skipfirst && current == 0) {
262 insx_discard(mode, iobase1, skipfirst);
265 if (skiplast && current == count-1)
269 // Write data to controller
270 dprintf(16, "Write sector id=%d dest=%p\n", driveid, buf_fl);
271 if (mode == ATA_MODE_PIO32)
272 outsl_fl(iobase1, buf_fl, bsize / 4);
274 outsw_fl(iobase1, buf_fl, bsize / 2);
276 // Read data from controller
277 dprintf(16, "Read sector id=%d dest=%p\n", driveid, buf_fl);
278 if (mode == ATA_MODE_PIO32)
279 insl_fl(iobase1, buf_fl, bsize / 4);
281 insw_fl(iobase1, buf_fl, bsize / 2);
285 if (skiplast && current == count-1)
286 insx_discard(mode, iobase1, skiplast);
288 status = pause_await_not_bsy(iobase1, iobase2);
294 SET_EBDA(sector_count, current);
295 if (current == count)
297 status &= (ATA_CB_STAT_BSY | ATA_CB_STAT_DRQ | ATA_CB_STAT_ERR);
298 if (status != ATA_CB_STAT_DRQ) {
299 dprintf(6, "ata_transfer : more sectors left (status %02x)\n"
305 status &= (ATA_CB_STAT_BSY | ATA_CB_STAT_DF | ATA_CB_STAT_DRQ
308 status &= ~ATA_CB_STAT_DF;
310 dprintf(6, "ata_transfer : no sectors left (status %02x)\n", status);
315 outb(ATA_CB_DC_HD15, iobase2+ATA_CB_DC);
320 ata_transfer_disk(const struct disk_op_s *op)
322 return ata_transfer(op->driveid, op->command == ATA_CMD_WRITE_SECTORS
323 , op->count, IDE_SECTOR_SIZE, 0, 0, op->buf_fl);
327 ata_transfer_cdrom(const struct disk_op_s *op)
329 return ata_transfer(op->driveid, 0, op->count, CDROM_SECTOR_SIZE
334 ata_transfer_cdemu(const struct disk_op_s *op, int before, int after)
336 int vcount = op->count * 4 - before - after;
337 int ret = ata_transfer(op->driveid, 0, op->count, CDROM_SECTOR_SIZE
338 , before*512, after*512, op->buf_fl);
340 SET_EBDA(sector_count, 0);
343 SET_EBDA(sector_count, vcount);
348 /****************************************************************
349 * ATA hard drive functions
350 ****************************************************************/
353 send_cmd_disk(const struct disk_op_s *op)
357 struct ata_pio_command cmd;
358 memset(&cmd, 0, sizeof(cmd));
360 cmd.command = op->command;
361 if (op->count >= (1<<8) || lba + op->count >= (1<<28)) {
362 cmd.sector_count2 = op->count >> 8;
363 cmd.lba_low2 = lba >> 24;
364 cmd.lba_mid2 = lba >> 32;
365 cmd.lba_high2 = lba >> 40;
372 cmd.sector_count = op->count;
374 cmd.lba_mid = lba >> 8;
375 cmd.lba_high = lba >> 16;
376 cmd.device = ((lba >> 24) & 0xf) | ATA_CB_DH_LBA;
378 return send_cmd(op->driveid, &cmd);
381 // Read/write count blocks from a harddrive.
383 ata_cmd_data(struct disk_op_s *op)
385 int ret = send_cmd_disk(op);
388 return ata_transfer_disk(op);
392 /****************************************************************
394 ****************************************************************/
396 // Low-level atapi command transmit function.
397 static __always_inline int
398 send_atapi_cmd(int driveid, u8 *cmdbuf, u8 cmdlen, u16 blocksize)
400 u8 channel = driveid / 2;
401 u16 iobase1 = GET_GLOBAL(ATA.channels[channel].iobase1);
402 u16 iobase2 = GET_GLOBAL(ATA.channels[channel].iobase2);
404 struct ata_pio_command cmd;
405 cmd.sector_count = 0;
408 cmd.lba_mid = blocksize;
409 cmd.lba_high = blocksize >> 8;
411 cmd.command = ATA_CMD_PACKET;
413 int ret = send_cmd(driveid, &cmd);
417 // Send command to device
418 outsw_fl(iobase1, MAKE_FLATPTR(GET_SEG(SS), cmdbuf), cmdlen / 2);
420 int status = pause_await_not_bsy(iobase1, iobase2);
424 if (status & ATA_CB_STAT_ERR) {
425 dprintf(6, "send_atapi_cmd : read error (status=%02x err=%02x)\n"
426 , status, inb(iobase1 + ATA_CB_ERR));
429 if (!(status & ATA_CB_STAT_DRQ)) {
430 dprintf(6, "send_atapi_cmd : DRQ not set (status %02x)\n", status);
437 // Low-level cdrom read atapi command transmit function.
439 send_cmd_cdrom(const struct disk_op_s *op)
442 memset(atacmd, 0, sizeof(atacmd));
444 atacmd[0]=0x28; // READ command
445 atacmd[7]=(op->count & 0xff00) >> 8; // Sectors
446 atacmd[8]=(op->count & 0x00ff);
447 atacmd[2]=(op->lba & 0xff000000) >> 24; // LBA
448 atacmd[3]=(op->lba & 0x00ff0000) >> 16;
449 atacmd[4]=(op->lba & 0x0000ff00) >> 8;
450 atacmd[5]=(op->lba & 0x000000ff);
452 return send_atapi_cmd(op->driveid, atacmd, sizeof(atacmd)
453 , CDROM_SECTOR_SIZE);
456 // Read sectors from the cdrom.
458 cdrom_read(struct disk_op_s *op)
460 int ret = send_cmd_cdrom(op);
464 return ata_transfer_cdrom(op);
467 // Pretend the cdrom has 512 byte sectors (instead of 2048) and read
470 cdrom_read_512(struct disk_op_s *op)
473 u32 vcount = op->count;
474 u32 lba = op->lba = vlba / 4;
475 u32 velba = vlba + vcount - 1;
476 u32 elba = velba / 4;
477 op->count = elba - lba + 1;
478 int before = vlba % 4;
479 int after = 3 - (velba % 4);
481 dprintf(16, "cdrom_read_512: id=%d vlba=%d vcount=%d buf=%p lba=%d elba=%d"
482 " count=%d before=%d after=%d\n"
483 , op->driveid, vlba, vcount, op->buf_fl, lba, elba
484 , op->count, before, after);
486 int ret = send_cmd_cdrom(op);
490 return ata_transfer_cdemu(op, before, after);
493 // Send a simple atapi command to a drive.
495 ata_cmd_packet(int driveid, u8 *cmdbuf, u8 cmdlen
496 , u32 length, void *buf_fl)
498 int ret = send_atapi_cmd(driveid, cmdbuf, cmdlen, length);
502 return ata_transfer(driveid, 0, 1, length, 0, 0, buf_fl);
506 /****************************************************************
507 * ATA detect and init
508 ****************************************************************/
511 report_model(int driveid, u8 *buffer)
517 for (i=0; i<40; i+=2) {
518 model[i] = buffer[i+54+1];
519 model[i+1] = buffer[i+54];
524 for (i=39; i>0; i--) {
525 if (model[i] != 0x20)
530 u8 channel = driveid / 2;
531 u8 slave = driveid % 2;
532 // XXX - model on stack not %cs
533 printf("ata%d %s: %s", channel, slave ? " slave" : "master", model);
537 get_ata_version(u8 *buffer)
539 u16 ataversion = *(u16*)&buffer[160];
541 for (version=15; version>0; version--)
542 if (ataversion & (1<<version))
548 init_drive_atapi(int driveid)
550 // Send an IDENTIFY_DEVICE_PACKET command to device
552 memset(buffer, 0, sizeof(buffer));
553 struct disk_op_s dop;
554 dop.driveid = driveid;
555 dop.command = ATA_CMD_IDENTIFY_DEVICE_PACKET;
558 dop.buf_fl = MAKE_FLATPTR(GET_SEG(SS), buffer);
559 int ret = ata_cmd_data(&dop);
563 // Success - setup as ATAPI.
564 SET_GLOBAL(ATA.devices[driveid].type, ATA_TYPE_ATAPI);
566 u8 type = buffer[1] & 0x1f;
567 u8 removable = (buffer[0] & 0x80) ? 1 : 0;
568 u8 mode = buffer[96] ? ATA_MODE_PIO32 : ATA_MODE_PIO16;
569 u16 blksize = CDROM_SECTOR_SIZE;
571 SET_GLOBAL(ATA.devices[driveid].device, type);
572 SET_GLOBAL(ATA.devices[driveid].removable, removable);
573 SET_GLOBAL(ATA.devices[driveid].mode, mode);
574 SET_GLOBAL(ATA.devices[driveid].blksize, blksize);
577 u8 cdcount = GET_GLOBAL(ATA.cdcount);
578 SET_GLOBAL(ATA.idmap[1][cdcount], driveid);
579 SET_GLOBAL(ATA.cdcount, ++cdcount);
581 report_model(driveid, buffer);
582 u8 version = get_ata_version(buffer);
583 if (GET_GLOBAL(ATA.devices[driveid].device)==ATA_DEVICE_CDROM)
584 printf(" ATAPI-%d CD-Rom/DVD-Rom\n", version);
586 printf(" ATAPI-%d Device\n", version);
592 fill_fdpt(int driveid)
597 u16 nlc = GET_GLOBAL(ATA.devices[driveid].lchs.cylinders);
598 u16 nlh = GET_GLOBAL(ATA.devices[driveid].lchs.heads);
599 u16 nlspt = GET_GLOBAL(ATA.devices[driveid].lchs.spt);
601 u16 npc = GET_GLOBAL(ATA.devices[driveid].pchs.cylinders);
602 u16 nph = GET_GLOBAL(ATA.devices[driveid].pchs.heads);
603 u16 npspt = GET_GLOBAL(ATA.devices[driveid].pchs.spt);
605 struct extended_bios_data_area_s *ebda = get_ebda_ptr();
606 ebda->fdpt[driveid].precompensation = 0xffff;
607 ebda->fdpt[driveid].drive_control_byte = 0xc0 | ((nph > 8) << 3);
608 ebda->fdpt[driveid].landing_zone = npc;
609 ebda->fdpt[driveid].cylinders = nlc;
610 ebda->fdpt[driveid].heads = nlh;
611 ebda->fdpt[driveid].sectors = nlspt;
613 if (nlc == npc && nlh == nph && nlspt == npspt)
614 // no logical CHS mapping used, just physical CHS
615 // use Standard Fixed Disk Parameter Table (FDPT)
618 // complies with Phoenix style Translated Fixed Disk Parameter
620 ebda->fdpt[driveid].phys_cylinders = npc;
621 ebda->fdpt[driveid].phys_heads = nph;
622 ebda->fdpt[driveid].phys_sectors = npspt;
623 ebda->fdpt[driveid].a0h_signature = 0xa0;
625 // Checksum structure.
626 u8 sum = checksum((u8*)&ebda->fdpt[driveid], sizeof(ebda->fdpt[driveid])-1);
627 ebda->fdpt[driveid].checksum = -sum;
631 get_translation(int driveid)
633 if (! CONFIG_COREBOOT) {
634 // Emulators pass in the translation info via nvram.
635 u8 channel = driveid / 2;
636 u8 translation = inb_cmos(CMOS_BIOS_DISKTRANSFLAG + channel/2);
637 translation >>= 2 * (driveid % 4);
642 // On COREBOOT, use a heuristic to determine translation type.
643 u16 heads = GET_GLOBAL(ATA.devices[driveid].pchs.heads);
644 u16 cylinders = GET_GLOBAL(ATA.devices[driveid].pchs.cylinders);
645 u16 spt = GET_GLOBAL(ATA.devices[driveid].pchs.spt);
647 if (cylinders <= 1024 && heads <= 16 && spt <= 63)
648 return ATA_TRANSLATION_NONE;
649 if (cylinders * heads <= 131072)
650 return ATA_TRANSLATION_LARGE;
651 return ATA_TRANSLATION_LBA;
655 setup_translation(int driveid)
657 u8 translation = get_translation(driveid);
658 SET_GLOBAL(ATA.devices[driveid].translation, translation);
660 u8 channel = driveid / 2;
661 u8 slave = driveid % 2;
662 u16 heads = GET_GLOBAL(ATA.devices[driveid].pchs.heads);
663 u16 cylinders = GET_GLOBAL(ATA.devices[driveid].pchs.cylinders);
664 u16 spt = GET_GLOBAL(ATA.devices[driveid].pchs.spt);
665 u64 sectors = GET_GLOBAL(ATA.devices[driveid].sectors);
667 dprintf(1, "ata%d-%d: PCHS=%u/%d/%d translation="
668 , channel, slave, cylinders, heads, spt);
669 switch (translation) {
670 case ATA_TRANSLATION_NONE:
673 case ATA_TRANSLATION_LBA:
676 if (sectors > 63*255*1024) {
681 u32 sect = (u32)sectors / 63;
693 cylinders = sect / heads;
695 case ATA_TRANSLATION_RECHS:
696 dprintf(1, "r-echs");
697 // Take care not to overflow
702 cylinders = (u16)((u32)(cylinders)*16/15);
704 // then go through the large bitshift process
705 case ATA_TRANSLATION_LARGE:
706 if (translation == ATA_TRANSLATION_LARGE)
708 while (cylinders > 1024) {
712 // If we max out the head count
718 // clip to 1024 cylinders in lchs
719 if (cylinders > 1024)
721 dprintf(1, " LCHS=%d/%d/%d\n", cylinders, heads, spt);
723 SET_GLOBAL(ATA.devices[driveid].lchs.heads, heads);
724 SET_GLOBAL(ATA.devices[driveid].lchs.cylinders, cylinders);
725 SET_GLOBAL(ATA.devices[driveid].lchs.spt, spt);
729 init_drive_ata(int driveid)
731 // Send an IDENTIFY_DEVICE command to device
733 memset(buffer, 0, sizeof(buffer));
734 struct disk_op_s dop;
735 dop.driveid = driveid;
736 dop.command = ATA_CMD_IDENTIFY_DEVICE;
739 dop.buf_fl = MAKE_FLATPTR(GET_SEG(SS), buffer);
740 int ret = ata_cmd_data(&dop);
744 // Success - setup as ATA.
745 SET_GLOBAL(ATA.devices[driveid].type, ATA_TYPE_ATA);
747 u8 removable = (buffer[0] & 0x80) ? 1 : 0;
748 u8 mode = buffer[48*2] ? ATA_MODE_PIO32 : ATA_MODE_PIO16;
749 u16 blksize = IDE_SECTOR_SIZE;
751 u16 cylinders = *(u16*)&buffer[1*2]; // word 1
752 u16 heads = *(u16*)&buffer[3*2]; // word 3
753 u16 spt = *(u16*)&buffer[6*2]; // word 6
756 if (*(u16*)&buffer[83*2] & (1 << 10)) // word 83 - lba48 support
757 sectors = *(u64*)&buffer[100*2]; // word 100-103
759 sectors = *(u32*)&buffer[60*2]; // word 60 and word 61
761 SET_GLOBAL(ATA.devices[driveid].device, ATA_DEVICE_HD);
762 SET_GLOBAL(ATA.devices[driveid].removable, removable);
763 SET_GLOBAL(ATA.devices[driveid].mode, mode);
764 SET_GLOBAL(ATA.devices[driveid].blksize, blksize);
765 SET_GLOBAL(ATA.devices[driveid].pchs.heads, heads);
766 SET_GLOBAL(ATA.devices[driveid].pchs.cylinders, cylinders);
767 SET_GLOBAL(ATA.devices[driveid].pchs.spt, spt);
768 SET_GLOBAL(ATA.devices[driveid].sectors, sectors);
770 // Setup disk geometry translation.
771 setup_translation(driveid);
774 u8 hdcount = GET_BDA(hdcount);
775 SET_GLOBAL(ATA.idmap[0][hdcount], driveid);
776 SET_BDA(hdcount, ++hdcount);
778 // Fill "fdpt" structure.
781 // Report drive info to user.
782 u64 sizeinmb = GET_GLOBAL(ATA.devices[driveid].sectors) >> 11;
783 report_model(driveid, buffer);
784 u8 version = get_ata_version(buffer);
785 if (sizeinmb < (1 << 16))
786 printf(" ATA-%d Hard-Disk (%u MiBytes)\n", version, (u32)sizeinmb);
788 printf(" ATA-%d Hard-Disk (%u GiBytes)\n", version
789 , (u32)(sizeinmb >> 10));
798 int driveid, last_reset_driveid;
799 for(driveid=0; driveid<CONFIG_MAX_ATA_DEVICES; driveid++) {
800 u8 channel = driveid / 2;
801 u8 slave = driveid % 2;
803 u16 iobase1 = GET_GLOBAL(ATA.channels[channel].iobase1);
808 outb(slave ? ATA_CB_DH_DEV1 : ATA_CB_DH_DEV0, iobase1+ATA_CB_DH);
809 outb(0x55, iobase1+ATA_CB_SC);
810 outb(0xaa, iobase1+ATA_CB_SN);
811 outb(0xaa, iobase1+ATA_CB_SC);
812 outb(0x55, iobase1+ATA_CB_SN);
813 outb(0x55, iobase1+ATA_CB_SC);
814 outb(0xaa, iobase1+ATA_CB_SN);
816 // Check if ioport registers look valid.
817 u8 sc = inb(iobase1+ATA_CB_SC);
818 u8 sn = inb(iobase1+ATA_CB_SN);
819 dprintf(6, "ata_detect drive=%d sc=%x sn=%x\n", driveid, sc, sn);
820 if (sc != 0x55 || sn != 0xaa)
824 if (slave && driveid == last_reset_driveid + 1) {
825 // The drive was just reset - no need to reset it again.
828 last_reset_driveid = driveid;
832 int ret = init_drive_atapi(driveid);
834 // Found an ATAPI drive.
837 u8 st = inb(iobase1+ATA_CB_STAT);
839 // Status not set - can't be a valid drive.
843 ret = await_rdy(iobase1);
848 init_drive_ata(driveid);
857 memset(&ATA, 0, sizeof(ATA));
859 // hdidmap and cdidmap init.
861 for (device=0; device < CONFIG_MAX_ATA_DEVICES; device++) {
862 SET_GLOBAL(ATA.idmap[0][device], CONFIG_MAX_ATA_DEVICES);
863 SET_GLOBAL(ATA.idmap[1][device], CONFIG_MAX_ATA_DEVICES);
866 // Scan PCI bus for ATA adapters
869 foreachpci(bdf, max) {
870 if (pci_config_readw(bdf, PCI_CLASS_DEVICE) != PCI_CLASS_STORAGE_IDE)
873 u8 irq = pci_config_readb(bdf, PCI_INTERRUPT_LINE);
874 SET_GLOBAL(ATA.channels[count].irq, irq);
875 SET_GLOBAL(ATA.channels[count].pci_bdf, bdf);
877 u8 prog_if = pci_config_readb(bdf, PCI_CLASS_PROG);
881 port1 = pci_config_readl(bdf, PCI_BASE_ADDRESS_0) & ~3;
882 port2 = pci_config_readl(bdf, PCI_BASE_ADDRESS_1) & ~3;
887 SET_GLOBAL(ATA.channels[count].iobase1, port1);
888 SET_GLOBAL(ATA.channels[count].iobase2, port2);
889 dprintf(1, "ATA controller %d at %x/%x (dev %x prog_if %x)\n"
890 , count, port1, port2, bdf, prog_if);
894 port1 = pci_config_readl(bdf, PCI_BASE_ADDRESS_2) & ~3;
895 port2 = pci_config_readl(bdf, PCI_BASE_ADDRESS_3) & ~3;
900 dprintf(1, "ATA controller %d at %x/%x (dev %x prog_if %x)\n"
901 , count, port1, port2, bdf, prog_if);
902 SET_GLOBAL(ATA.channels[count].iobase1, port1);
903 SET_GLOBAL(ATA.channels[count].iobase2, port2);
914 dprintf(3, "init hard drives\n");
918 SET_BDA(disk_control_byte, 0xc0);
920 enable_hwirq(14, entry_76);