cmd_ide.c 35.4 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449
/*
 * (C) Copyright 2000-2011
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * IDE support
 */

#include <common.h>
#include <config.h>
#include <watchdog.h>
#include <command.h>
#include <image.h>
#include <asm/byteorder.h>
#include <asm/io.h>

#if defined(CONFIG_IDE_8xx_DIRECT) || defined(CONFIG_IDE_PCMCIA)
# include <pcmcia.h>
#endif

#include <ide.h>
#include <ata.h>

#ifdef CONFIG_STATUS_LED
# include <status_led.h>
#endif

#ifdef __PPC__
# define EIEIO		__asm__ volatile ("eieio")
# define SYNC		__asm__ volatile ("sync")
#else
# define EIEIO		/* nothing */
# define SYNC		/* nothing */
#endif

/* ------------------------------------------------------------------------- */

/* Current I/O Device	*/
static int curr_device = -1;

/* Current offset for IDE0 / IDE1 bus access	*/
ulong ide_bus_offset[CONFIG_SYS_IDE_MAXBUS] = {
#if defined(CONFIG_SYS_ATA_IDE0_OFFSET)
	CONFIG_SYS_ATA_IDE0_OFFSET,
#endif
#if defined(CONFIG_SYS_ATA_IDE1_OFFSET) && (CONFIG_SYS_IDE_MAXBUS > 1)
	CONFIG_SYS_ATA_IDE1_OFFSET,
#endif
};

static int ide_bus_ok[CONFIG_SYS_IDE_MAXBUS];

block_dev_desc_t ide_dev_desc[CONFIG_SYS_IDE_MAXDEVICE];
/* ------------------------------------------------------------------------- */

#ifdef CONFIG_IDE_RESET
static void  ide_reset (void);
#else
#define ide_reset()	/* dummy */
#endif

static void  ide_ident (block_dev_desc_t *dev_desc);
static uchar ide_wait  (int dev, ulong t);

#define IDE_TIME_OUT	2000	/* 2 sec timeout */

#define ATAPI_TIME_OUT	7000	/* 7 sec timeout (5 sec seems to work...) */

#define IDE_SPIN_UP_TIME_OUT 5000 /* 5 sec spin-up timeout */

static void ident_cpy (unsigned char *dest, unsigned char *src, unsigned int len);

#ifndef CONFIG_SYS_ATA_PORT_ADDR
#define CONFIG_SYS_ATA_PORT_ADDR(port) (port)
#endif

#ifdef CONFIG_ATAPI
static void	atapi_inquiry(block_dev_desc_t *dev_desc);
static ulong atapi_read(int device, ulong blknr, lbaint_t blkcnt,
			void *buffer);
#endif


/* ------------------------------------------------------------------------- */

int do_ide(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
	int rcode = 0;

	switch (argc) {
	case 0:
	case 1:
		return CMD_RET_USAGE;
	case 2:
		if (strncmp(argv[1], "res", 3) == 0) {
			puts("\nReset IDE"
#ifdef CONFIG_IDE_8xx_DIRECT
			     " on PCMCIA " PCMCIA_SLOT_MSG
#endif
			     ": ");

			ide_init();
			return 0;
		} else if (strncmp(argv[1], "inf", 3) == 0) {
			int i;

			putc('\n');

			for (i = 0; i < CONFIG_SYS_IDE_MAXDEVICE; ++i) {
				if (ide_dev_desc[i].type == DEV_TYPE_UNKNOWN)
					continue;  /* list only known devices */
				printf("IDE device %d: ", i);
				dev_print(&ide_dev_desc[i]);
			}
			return 0;

		} else if (strncmp(argv[1], "dev", 3) == 0) {
			if ((curr_device < 0)
			    || (curr_device >= CONFIG_SYS_IDE_MAXDEVICE)) {
				puts("\nno IDE devices available\n");
				return 1;
			}
			printf("\nIDE device %d: ", curr_device);
			dev_print(&ide_dev_desc[curr_device]);
			return 0;
		} else if (strncmp(argv[1], "part", 4) == 0) {
			int dev, ok;

			for (ok = 0, dev = 0;
			     dev < CONFIG_SYS_IDE_MAXDEVICE;
			     ++dev) {
				if (ide_dev_desc[dev].part_type !=
				    PART_TYPE_UNKNOWN) {
					++ok;
					if (dev)
						putc('\n');
					print_part(&ide_dev_desc[dev]);
				}
			}
			if (!ok) {
				puts("\nno IDE devices available\n");
				rcode++;
			}
			return rcode;
		}
		return CMD_RET_USAGE;
	case 3:
		if (strncmp(argv[1], "dev", 3) == 0) {
			int dev = (int) simple_strtoul(argv[2], NULL, 10);

			printf("\nIDE device %d: ", dev);
			if (dev >= CONFIG_SYS_IDE_MAXDEVICE) {
				puts("unknown device\n");
				return 1;
			}
			dev_print(&ide_dev_desc[dev]);
			/*ide_print (dev); */

			if (ide_dev_desc[dev].type == DEV_TYPE_UNKNOWN)
				return 1;

			curr_device = dev;

			puts("... is now current device\n");

			return 0;
		} else if (strncmp(argv[1], "part", 4) == 0) {
			int dev = (int) simple_strtoul(argv[2], NULL, 10);

			if (ide_dev_desc[dev].part_type != PART_TYPE_UNKNOWN) {
				print_part(&ide_dev_desc[dev]);
			} else {
				printf("\nIDE device %d not available\n",
				       dev);
				rcode = 1;
			}
			return rcode;
		}

		return CMD_RET_USAGE;
	default:
		/* at least 4 args */

		if (strcmp(argv[1], "read") == 0) {
			ulong addr = simple_strtoul(argv[2], NULL, 16);
			ulong cnt = simple_strtoul(argv[4], NULL, 16);
			ulong n;

#ifdef CONFIG_SYS_64BIT_LBA
			lbaint_t blk = simple_strtoull(argv[3], NULL, 16);

			printf("\nIDE read: device %d block # %lld, count %ld ... ",
				curr_device, blk, cnt);
#else
			lbaint_t blk = simple_strtoul(argv[3], NULL, 16);

			printf("\nIDE read: device %d block # %ld, count %ld ... ",
				curr_device, blk, cnt);
#endif

			n = ide_dev_desc[curr_device].block_read(curr_device,
								 blk, cnt,
								 (ulong *)addr);
			/* flush cache after read */
			flush_cache(addr,
				    cnt * ide_dev_desc[curr_device].blksz);

			printf("%ld blocks read: %s\n",
			       n, (n == cnt) ? "OK" : "ERROR");
			if (n == cnt)
				return 0;
			else
				return 1;
		} else if (strcmp(argv[1], "write") == 0) {
			ulong addr = simple_strtoul(argv[2], NULL, 16);
			ulong cnt = simple_strtoul(argv[4], NULL, 16);
			ulong n;

#ifdef CONFIG_SYS_64BIT_LBA
			lbaint_t blk = simple_strtoull(argv[3], NULL, 16);

			printf("\nIDE write: device %d block # %lld, count %ld ... ",
				curr_device, blk, cnt);
#else
			lbaint_t blk = simple_strtoul(argv[3], NULL, 16);

			printf("\nIDE write: device %d block # %ld, count %ld ... ",
				curr_device, blk, cnt);
#endif
			n = ide_write(curr_device, blk, cnt, (ulong *) addr);

			printf("%ld blocks written: %s\n",
				n, (n == cnt) ? "OK" : "ERROR");
			if (n == cnt)
				return 0;
			else
				return 1;
		} else {
			return CMD_RET_USAGE;
		}

		return rcode;
	}
}

int do_diskboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
	return common_diskboot(cmdtp, "ide", argc, argv);
}

/* ------------------------------------------------------------------------- */

__weak void ide_led(uchar led, uchar status)
{
#if defined(CONFIG_IDE_LED) && defined(PER8_BASE) /* required by LED_PORT */
	static uchar led_buffer;	/* Buffer for current LED status */

	uchar *led_port = LED_PORT;

	if (status)		/* switch LED on        */
		led_buffer |= led;
	else			/* switch LED off       */
		led_buffer &= ~led;

	*led_port = led_buffer;
#endif
}

#ifndef CONFIG_IDE_LED	/* define LED macros, they are not used anyways */
# define DEVICE_LED(x) 0
# define LED_IDE1 1
# define LED_IDE2 2
#endif

/* ------------------------------------------------------------------------- */

__weak void ide_outb(int dev, int port, unsigned char val)
{
	debug("ide_outb (dev= %d, port= 0x%x, val= 0x%02x) : @ 0x%08lx\n",
	      dev, port, val,
	      (ATA_CURR_BASE(dev) + CONFIG_SYS_ATA_PORT_ADDR(port)));

#if defined(CONFIG_IDE_AHB)
	if (port) {
		/* write command */
		ide_write_register(dev, port, val);
	} else {
		/* write data */
		outb(val, (ATA_CURR_BASE(dev)));
	}
#else
	outb(val, (ATA_CURR_BASE(dev) + CONFIG_SYS_ATA_PORT_ADDR(port)));
#endif
}

__weak unsigned char ide_inb(int dev, int port)
{
	uchar val;

#if defined(CONFIG_IDE_AHB)
	val = ide_read_register(dev, port);
#else
	val = inb((ATA_CURR_BASE(dev) + CONFIG_SYS_ATA_PORT_ADDR(port)));
#endif

	debug("ide_inb (dev= %d, port= 0x%x) : @ 0x%08lx -> 0x%02x\n",
	      dev, port,
	      (ATA_CURR_BASE(dev) + CONFIG_SYS_ATA_PORT_ADDR(port)), val);
	return val;
}

void ide_init(void)
{
	unsigned char c;
	int i, bus;

#ifdef CONFIG_IDE_8xx_PCCARD
	extern int ide_devices_found;	/* Initialized in check_ide_device() */
#endif /* CONFIG_IDE_8xx_PCCARD */

#ifdef CONFIG_IDE_PREINIT
	WATCHDOG_RESET();

	if (ide_preinit()) {
		puts("ide_preinit failed\n");
		return;
	}
#endif /* CONFIG_IDE_PREINIT */

	WATCHDOG_RESET();

	/*
	 * Reset the IDE just to be sure.
	 * Light LED's to show
	 */
	ide_led((LED_IDE1 | LED_IDE2), 1);	/* LED's on     */

	/* ATAPI Drives seems to need a proper IDE Reset */
	ide_reset();

#ifdef CONFIG_IDE_INIT_POSTRESET
	WATCHDOG_RESET();

	if (ide_init_postreset()) {
		puts("ide_preinit_postreset failed\n");
		return;
	}
#endif /* CONFIG_IDE_INIT_POSTRESET */

	/*
	 * Wait for IDE to get ready.
	 * According to spec, this can take up to 31 seconds!
	 */
	for (bus = 0; bus < CONFIG_SYS_IDE_MAXBUS; ++bus) {
		int dev =
			bus * (CONFIG_SYS_IDE_MAXDEVICE /
			       CONFIG_SYS_IDE_MAXBUS);

#ifdef CONFIG_IDE_8xx_PCCARD
		/* Skip non-ide devices from probing */
		if ((ide_devices_found & (1 << bus)) == 0) {
			ide_led((LED_IDE1 | LED_IDE2), 0);	/* LED's off */
			continue;
		}
#endif
		printf("Bus %d: ", bus);

		ide_bus_ok[bus] = 0;

		/* Select device
		 */
		udelay(100000);	/* 100 ms */
		ide_outb(dev, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(dev));
		udelay(100000);	/* 100 ms */
		i = 0;
		do {
			udelay(10000);	/* 10 ms */

			c = ide_inb(dev, ATA_STATUS);
			i++;
			if (i > (ATA_RESET_TIME * 100)) {
				puts("** Timeout **\n");
				/* LED's off */
				ide_led((LED_IDE1 | LED_IDE2), 0);
				return;
			}
			if ((i >= 100) && ((i % 100) == 0))
				putc('.');

		} while (c & ATA_STAT_BUSY);

		if (c & (ATA_STAT_BUSY | ATA_STAT_FAULT)) {
			puts("not available  ");
			debug("Status = 0x%02X ", c);
#ifndef CONFIG_ATAPI		/* ATAPI Devices do not set DRDY */
		} else if ((c & ATA_STAT_READY) == 0) {
			puts("not available  ");
			debug("Status = 0x%02X ", c);
#endif
		} else {
			puts("OK ");
			ide_bus_ok[bus] = 1;
		}
		WATCHDOG_RESET();
	}

	putc('\n');

	ide_led((LED_IDE1 | LED_IDE2), 0);	/* LED's off    */

	curr_device = -1;
	for (i = 0; i < CONFIG_SYS_IDE_MAXDEVICE; ++i) {
		int led = (IDE_BUS(i) == 0) ? LED_IDE1 : LED_IDE2;
		ide_dev_desc[i].type = DEV_TYPE_UNKNOWN;
		ide_dev_desc[i].if_type = IF_TYPE_IDE;
		ide_dev_desc[i].dev = i;
		ide_dev_desc[i].part_type = PART_TYPE_UNKNOWN;
		ide_dev_desc[i].blksz = 0;
		ide_dev_desc[i].log2blksz =
			LOG2_INVALID(typeof(ide_dev_desc[i].log2blksz));
		ide_dev_desc[i].lba = 0;
		ide_dev_desc[i].block_read = ide_read;
		ide_dev_desc[i].block_write = ide_write;
		if (!ide_bus_ok[IDE_BUS(i)])
			continue;
		ide_led(led, 1);	/* LED on       */
		ide_ident(&ide_dev_desc[i]);
		ide_led(led, 0);	/* LED off      */
		dev_print(&ide_dev_desc[i]);

		if ((ide_dev_desc[i].lba > 0) && (ide_dev_desc[i].blksz > 0)) {
			/* initialize partition type */
			init_part(&ide_dev_desc[i]);
			if (curr_device < 0)
				curr_device = i;
		}
	}
	WATCHDOG_RESET();
}

/* ------------------------------------------------------------------------- */

#ifdef CONFIG_PARTITIONS
block_dev_desc_t *ide_get_dev(int dev)
{
	return (dev < CONFIG_SYS_IDE_MAXDEVICE) ? &ide_dev_desc[dev] : NULL;
}
#endif

/* ------------------------------------------------------------------------- */

/* We only need to swap data if we are running on a big endian cpu. */
#if defined(__LITTLE_ENDIAN)
__weak void ide_input_swap_data(int dev, ulong *sect_buf, int words)
{
	ide_input_data(dev, sect_buf, words);
}
#else
__weak void ide_input_swap_data(int dev, ulong *sect_buf, int words)
{
	volatile ushort *pbuf =
		(ushort *) (ATA_CURR_BASE(dev) + ATA_DATA_REG);
	ushort *dbuf = (ushort *) sect_buf;

	debug("in input swap data base for read is %lx\n",
	      (unsigned long) pbuf);

	while (words--) {
#ifdef __MIPS__
		*dbuf++ = swab16p((u16 *) pbuf);
		*dbuf++ = swab16p((u16 *) pbuf);
#else
		*dbuf++ = ld_le16(pbuf);
		*dbuf++ = ld_le16(pbuf);
#endif /* !MIPS */
	}
}
#endif /* __LITTLE_ENDIAN */


#if defined(CONFIG_IDE_SWAP_IO)
__weak void ide_output_data(int dev, const ulong *sect_buf, int words)
{
	ushort *dbuf;
	volatile ushort *pbuf;

	pbuf = (ushort *) (ATA_CURR_BASE(dev) + ATA_DATA_REG);
	dbuf = (ushort *) sect_buf;
	while (words--) {
		EIEIO;
		*pbuf = *dbuf++;
		EIEIO;
		*pbuf = *dbuf++;
	}
}
#else  /* ! CONFIG_IDE_SWAP_IO */
__weak void ide_output_data(int dev, const ulong *sect_buf, int words)
{
#if defined(CONFIG_IDE_AHB)
	ide_write_data(dev, sect_buf, words);
#else
	outsw(ATA_CURR_BASE(dev) + ATA_DATA_REG, sect_buf, words << 1);
#endif
}
#endif /* CONFIG_IDE_SWAP_IO */

#if defined(CONFIG_IDE_SWAP_IO)
__weak void ide_input_data(int dev, ulong *sect_buf, int words)
{
	ushort *dbuf;
	volatile ushort *pbuf;

	pbuf = (ushort *) (ATA_CURR_BASE(dev) + ATA_DATA_REG);
	dbuf = (ushort *) sect_buf;

	debug("in input data base for read is %lx\n", (unsigned long) pbuf);

	while (words--) {
		EIEIO;
		*dbuf++ = *pbuf;
		EIEIO;
		*dbuf++ = *pbuf;
	}
}
#else  /* ! CONFIG_IDE_SWAP_IO */
__weak void ide_input_data(int dev, ulong *sect_buf, int words)
{
#if defined(CONFIG_IDE_AHB)
	ide_read_data(dev, sect_buf, words);
#else
	insw(ATA_CURR_BASE(dev) + ATA_DATA_REG, sect_buf, words << 1);
#endif
}

#endif /* CONFIG_IDE_SWAP_IO */

/* -------------------------------------------------------------------------
 */
static void ide_ident(block_dev_desc_t *dev_desc)
{
	unsigned char c;
	hd_driveid_t iop;

#ifdef CONFIG_ATAPI
	int retries = 0;
#endif
	int device;

	device = dev_desc->dev;
	printf("  Device %d: ", device);

	ide_led(DEVICE_LED(device), 1);	/* LED on       */
	/* Select device
	 */
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	dev_desc->if_type = IF_TYPE_IDE;
#ifdef CONFIG_ATAPI

	retries = 0;

	/* Warning: This will be tricky to read */
	while (retries <= 1) {
		/* check signature */
		if ((ide_inb(device, ATA_SECT_CNT) == 0x01) &&
		    (ide_inb(device, ATA_SECT_NUM) == 0x01) &&
		    (ide_inb(device, ATA_CYL_LOW) == 0x14) &&
		    (ide_inb(device, ATA_CYL_HIGH) == 0xEB)) {
			/* ATAPI Signature found */
			dev_desc->if_type = IF_TYPE_ATAPI;
			/*
			 * Start Ident Command
			 */
			ide_outb(device, ATA_COMMAND, ATAPI_CMD_IDENT);
			/*
			 * Wait for completion - ATAPI devices need more time
			 * to become ready
			 */
			c = ide_wait(device, ATAPI_TIME_OUT);
		} else
#endif
		{
			/*
			 * Start Ident Command
			 */
			ide_outb(device, ATA_COMMAND, ATA_CMD_IDENT);

			/*
			 * Wait for completion
			 */
			c = ide_wait(device, IDE_TIME_OUT);
		}
		ide_led(DEVICE_LED(device), 0);	/* LED off      */

		if (((c & ATA_STAT_DRQ) == 0) ||
		    ((c & (ATA_STAT_FAULT | ATA_STAT_ERR)) != 0)) {
#ifdef CONFIG_ATAPI
			{
				/*
				 * Need to soft reset the device
				 * in case it's an ATAPI...
				 */
				debug("Retrying...\n");
				ide_outb(device, ATA_DEV_HD,
					 ATA_LBA | ATA_DEVICE(device));
				udelay(100000);
				ide_outb(device, ATA_COMMAND, 0x08);
				udelay(500000);	/* 500 ms */
			}
			/*
			 * Select device
			 */
			ide_outb(device, ATA_DEV_HD,
				 ATA_LBA | ATA_DEVICE(device));
			retries++;
#else
			return;
#endif
		}
#ifdef CONFIG_ATAPI
		else
			break;
	}			/* see above - ugly to read */

	if (retries == 2)	/* Not found */
		return;
#endif

	ide_input_swap_data(device, (ulong *)&iop, ATA_SECTORWORDS);

	ident_cpy((unsigned char *) dev_desc->revision, iop.fw_rev,
		  sizeof(dev_desc->revision));
	ident_cpy((unsigned char *) dev_desc->vendor, iop.model,
		  sizeof(dev_desc->vendor));
	ident_cpy((unsigned char *) dev_desc->product, iop.serial_no,
		  sizeof(dev_desc->product));
#ifdef __LITTLE_ENDIAN
	/*
	 * firmware revision, model, and serial number have Big Endian Byte
	 * order in Word. Convert all three to little endian.
	 *
	 * See CF+ and CompactFlash Specification Revision 2.0:
	 * 6.2.1.6: Identify Drive, Table 39 for more details
	 */

	strswab(dev_desc->revision);
	strswab(dev_desc->vendor);
	strswab(dev_desc->product);
#endif /* __LITTLE_ENDIAN */

	if ((iop.config & 0x0080) == 0x0080)
		dev_desc->removable = 1;
	else
		dev_desc->removable = 0;

#ifdef CONFIG_ATAPI
	if (dev_desc->if_type == IF_TYPE_ATAPI) {
		atapi_inquiry(dev_desc);
		return;
	}
#endif /* CONFIG_ATAPI */

#ifdef __BIG_ENDIAN
	/* swap shorts */
	dev_desc->lba = (iop.lba_capacity << 16) | (iop.lba_capacity >> 16);
#else  /* ! __BIG_ENDIAN */
	/*
	 * do not swap shorts on little endian
	 *
	 * See CF+ and CompactFlash Specification Revision 2.0:
	 * 6.2.1.6: Identfy Drive, Table 39, Word Address 57-58 for details.
	 */
	dev_desc->lba = iop.lba_capacity;
#endif /* __BIG_ENDIAN */

#ifdef CONFIG_LBA48
	if (iop.command_set_2 & 0x0400) {	/* LBA 48 support */
		dev_desc->lba48 = 1;
		dev_desc->lba = (unsigned long long) iop.lba48_capacity[0] |
			((unsigned long long) iop.lba48_capacity[1] << 16) |
			((unsigned long long) iop.lba48_capacity[2] << 32) |
			((unsigned long long) iop.lba48_capacity[3] << 48);
	} else {
		dev_desc->lba48 = 0;
	}
#endif /* CONFIG_LBA48 */
	/* assuming HD */
	dev_desc->type = DEV_TYPE_HARDDISK;
	dev_desc->blksz = ATA_BLOCKSIZE;
	dev_desc->log2blksz = LOG2(dev_desc->blksz);
	dev_desc->lun = 0;	/* just to fill something in... */

#if 0				/* only used to test the powersaving mode,
				 * if enabled, the drive goes after 5 sec
				 * in standby mode */
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	c = ide_wait(device, IDE_TIME_OUT);
	ide_outb(device, ATA_SECT_CNT, 1);
	ide_outb(device, ATA_LBA_LOW, 0);
	ide_outb(device, ATA_LBA_MID, 0);
	ide_outb(device, ATA_LBA_HIGH, 0);
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	ide_outb(device, ATA_COMMAND, 0xe3);
	udelay(50);
	c = ide_wait(device, IDE_TIME_OUT);	/* can't take over 500 ms */
#endif
}


/* ------------------------------------------------------------------------- */

ulong ide_read(int device, lbaint_t blknr, lbaint_t blkcnt, void *buffer)
{
	ulong n = 0;
	unsigned char c;
	unsigned char pwrsave = 0;	/* power save */

#ifdef CONFIG_LBA48
	unsigned char lba48 = 0;

	if (blknr & 0x0000fffff0000000ULL) {
		/* more than 28 bits used, use 48bit mode */
		lba48 = 1;
	}
#endif
	debug("ide_read dev %d start " LBAF ", blocks " LBAF " buffer at %lX\n",
	      device, blknr, blkcnt, (ulong) buffer);

	ide_led(DEVICE_LED(device), 1);	/* LED on       */

	/* Select device
	 */
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	c = ide_wait(device, IDE_TIME_OUT);

	if (c & ATA_STAT_BUSY) {
		printf("IDE read: device %d not ready\n", device);
		goto IDE_READ_E;
	}

	/* first check if the drive is in Powersaving mode, if yes,
	 * increase the timeout value */
	ide_outb(device, ATA_COMMAND, ATA_CMD_CHK_PWR);
	udelay(50);

	c = ide_wait(device, IDE_TIME_OUT);	/* can't take over 500 ms */

	if (c & ATA_STAT_BUSY) {
		printf("IDE read: device %d not ready\n", device);
		goto IDE_READ_E;
	}
	if ((c & ATA_STAT_ERR) == ATA_STAT_ERR) {
		printf("No Powersaving mode %X\n", c);
	} else {
		c = ide_inb(device, ATA_SECT_CNT);
		debug("Powersaving %02X\n", c);
		if (c == 0)
			pwrsave = 1;
	}


	while (blkcnt-- > 0) {

		c = ide_wait(device, IDE_TIME_OUT);

		if (c & ATA_STAT_BUSY) {
			printf("IDE read: device %d not ready\n", device);
			break;
		}
#ifdef CONFIG_LBA48
		if (lba48) {
			/* write high bits */
			ide_outb(device, ATA_SECT_CNT, 0);
			ide_outb(device, ATA_LBA_LOW, (blknr >> 24) & 0xFF);
#ifdef CONFIG_SYS_64BIT_LBA
			ide_outb(device, ATA_LBA_MID, (blknr >> 32) & 0xFF);
			ide_outb(device, ATA_LBA_HIGH, (blknr >> 40) & 0xFF);
#else
			ide_outb(device, ATA_LBA_MID, 0);
			ide_outb(device, ATA_LBA_HIGH, 0);
#endif
		}
#endif
		ide_outb(device, ATA_SECT_CNT, 1);
		ide_outb(device, ATA_LBA_LOW, (blknr >> 0) & 0xFF);
		ide_outb(device, ATA_LBA_MID, (blknr >> 8) & 0xFF);
		ide_outb(device, ATA_LBA_HIGH, (blknr >> 16) & 0xFF);

#ifdef CONFIG_LBA48
		if (lba48) {
			ide_outb(device, ATA_DEV_HD,
				 ATA_LBA | ATA_DEVICE(device));
			ide_outb(device, ATA_COMMAND, ATA_CMD_READ_EXT);

		} else
#endif
		{
			ide_outb(device, ATA_DEV_HD, ATA_LBA |
				 ATA_DEVICE(device) | ((blknr >> 24) & 0xF));
			ide_outb(device, ATA_COMMAND, ATA_CMD_READ);
		}

		udelay(50);

		if (pwrsave) {
			/* may take up to 4 sec */
			c = ide_wait(device, IDE_SPIN_UP_TIME_OUT);
			pwrsave = 0;
		} else {
			/* can't take over 500 ms */
			c = ide_wait(device, IDE_TIME_OUT);
		}

		if ((c & (ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR)) !=
		    ATA_STAT_DRQ) {
			printf("Error (no IRQ) dev %d blk " LBAF ": status "
			       "%#02x\n", device, blknr, c);
			break;
		}

		ide_input_data(device, buffer, ATA_SECTORWORDS);
		(void) ide_inb(device, ATA_STATUS);	/* clear IRQ */

		++n;
		++blknr;
		buffer += ATA_BLOCKSIZE;
	}
IDE_READ_E:
	ide_led(DEVICE_LED(device), 0);	/* LED off      */
	return (n);
}

/* ------------------------------------------------------------------------- */


ulong ide_write(int device, lbaint_t blknr, lbaint_t blkcnt, const void *buffer)
{
	ulong n = 0;
	unsigned char c;

#ifdef CONFIG_LBA48
	unsigned char lba48 = 0;

	if (blknr & 0x0000fffff0000000ULL) {
		/* more than 28 bits used, use 48bit mode */
		lba48 = 1;
	}
#endif

	ide_led(DEVICE_LED(device), 1);	/* LED on       */

	/* Select device
	 */
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));

	while (blkcnt-- > 0) {

		c = ide_wait(device, IDE_TIME_OUT);

		if (c & ATA_STAT_BUSY) {
			printf("IDE read: device %d not ready\n", device);
			goto WR_OUT;
		}
#ifdef CONFIG_LBA48
		if (lba48) {
			/* write high bits */
			ide_outb(device, ATA_SECT_CNT, 0);
			ide_outb(device, ATA_LBA_LOW, (blknr >> 24) & 0xFF);
#ifdef CONFIG_SYS_64BIT_LBA
			ide_outb(device, ATA_LBA_MID, (blknr >> 32) & 0xFF);
			ide_outb(device, ATA_LBA_HIGH, (blknr >> 40) & 0xFF);
#else
			ide_outb(device, ATA_LBA_MID, 0);
			ide_outb(device, ATA_LBA_HIGH, 0);
#endif
		}
#endif
		ide_outb(device, ATA_SECT_CNT, 1);
		ide_outb(device, ATA_LBA_LOW, (blknr >> 0) & 0xFF);
		ide_outb(device, ATA_LBA_MID, (blknr >> 8) & 0xFF);
		ide_outb(device, ATA_LBA_HIGH, (blknr >> 16) & 0xFF);

#ifdef CONFIG_LBA48
		if (lba48) {
			ide_outb(device, ATA_DEV_HD,
				 ATA_LBA | ATA_DEVICE(device));
			ide_outb(device, ATA_COMMAND, ATA_CMD_WRITE_EXT);

		} else
#endif
		{
			ide_outb(device, ATA_DEV_HD, ATA_LBA |
				 ATA_DEVICE(device) | ((blknr >> 24) & 0xF));
			ide_outb(device, ATA_COMMAND, ATA_CMD_WRITE);
		}

		udelay(50);

		/* can't take over 500 ms */
		c = ide_wait(device, IDE_TIME_OUT);

		if ((c & (ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR)) !=
		    ATA_STAT_DRQ) {
			printf("Error (no IRQ) dev %d blk " LBAF ": status "
				"%#02x\n", device, blknr, c);
			goto WR_OUT;
		}

		ide_output_data(device, buffer, ATA_SECTORWORDS);
		c = ide_inb(device, ATA_STATUS);	/* clear IRQ */
		++n;
		++blknr;
		buffer += ATA_BLOCKSIZE;
	}
WR_OUT:
	ide_led(DEVICE_LED(device), 0);	/* LED off      */
	return (n);
}

/* ------------------------------------------------------------------------- */

/*
 * copy src to dest, skipping leading and trailing blanks and null
 * terminate the string
 * "len" is the size of available memory including the terminating '\0'
 */
static void ident_cpy(unsigned char *dst, unsigned char *src,
		      unsigned int len)
{
	unsigned char *end, *last;

	last = dst;
	end = src + len - 1;

	/* reserve space for '\0' */
	if (len < 2)
		goto OUT;

	/* skip leading white space */
	while ((*src) && (src < end) && (*src == ' '))
		++src;

	/* copy string, omitting trailing white space */
	while ((*src) && (src < end)) {
		*dst++ = *src;
		if (*src++ != ' ')
			last = dst;
	}
OUT:
	*last = '\0';
}

/* ------------------------------------------------------------------------- */

/*
 * Wait until Busy bit is off, or timeout (in ms)
 * Return last status
 */
static uchar ide_wait(int dev, ulong t)
{
	ulong delay = 10 * t;	/* poll every 100 us */
	uchar c;

	while ((c = ide_inb(dev, ATA_STATUS)) & ATA_STAT_BUSY) {
		udelay(100);
		if (delay-- == 0)
			break;
	}
	return (c);
}

/* ------------------------------------------------------------------------- */

#ifdef CONFIG_IDE_RESET
extern void ide_set_reset(int idereset);

static void ide_reset(void)
{
	int i;

	curr_device = -1;
	for (i = 0; i < CONFIG_SYS_IDE_MAXBUS; ++i)
		ide_bus_ok[i] = 0;
	for (i = 0; i < CONFIG_SYS_IDE_MAXDEVICE; ++i)
		ide_dev_desc[i].type = DEV_TYPE_UNKNOWN;

	ide_set_reset(1);	/* assert reset */

	/* the reset signal shall be asserted for et least 25 us */
	udelay(25);

	WATCHDOG_RESET();

	/* de-assert RESET signal */
	ide_set_reset(0);

	/* wait 250 ms */
	for (i = 0; i < 250; ++i)
		udelay(1000);
}

#endif /* CONFIG_IDE_RESET */

/* ------------------------------------------------------------------------- */

#if defined(CONFIG_OF_IDE_FIXUP)
int ide_device_present(int dev)
{
	if (dev >= CONFIG_SYS_IDE_MAXBUS)
		return 0;
	return (ide_dev_desc[dev].type == DEV_TYPE_UNKNOWN ? 0 : 1);
}
#endif
/* ------------------------------------------------------------------------- */

#ifdef CONFIG_ATAPI
/****************************************************************************
 * ATAPI Support
 */

#if defined(CONFIG_IDE_SWAP_IO)
/* since ATAPI may use commands with not 4 bytes alligned length
 * we have our own transfer functions, 2 bytes alligned */
__weak void ide_output_data_shorts(int dev, ushort *sect_buf, int shorts)
{
	ushort *dbuf;
	volatile ushort *pbuf;

	pbuf = (ushort *) (ATA_CURR_BASE(dev) + ATA_DATA_REG);
	dbuf = (ushort *) sect_buf;

	debug("in output data shorts base for read is %lx\n",
	      (unsigned long) pbuf);

	while (shorts--) {
		EIEIO;
		*pbuf = *dbuf++;
	}
}

__weak void ide_input_data_shorts(int dev, ushort *sect_buf, int shorts)
{
	ushort *dbuf;
	volatile ushort *pbuf;

	pbuf = (ushort *) (ATA_CURR_BASE(dev) + ATA_DATA_REG);
	dbuf = (ushort *) sect_buf;

	debug("in input data shorts base for read is %lx\n",
	      (unsigned long) pbuf);

	while (shorts--) {
		EIEIO;
		*dbuf++ = *pbuf;
	}
}

#else  /* ! CONFIG_IDE_SWAP_IO */
__weak void ide_output_data_shorts(int dev, ushort *sect_buf, int shorts)
{
	outsw(ATA_CURR_BASE(dev) + ATA_DATA_REG, sect_buf, shorts);
}

__weak void ide_input_data_shorts(int dev, ushort *sect_buf, int shorts)
{
	insw(ATA_CURR_BASE(dev) + ATA_DATA_REG, sect_buf, shorts);
}

#endif /* CONFIG_IDE_SWAP_IO */

/*
 * Wait until (Status & mask) == res, or timeout (in ms)
 * Return last status
 * This is used since some ATAPI CD ROMs clears their Busy Bit first
 * and then they set their DRQ Bit
 */
static uchar atapi_wait_mask(int dev, ulong t, uchar mask, uchar res)
{
	ulong delay = 10 * t;	/* poll every 100 us */
	uchar c;

	/* prevents to read the status before valid */
	c = ide_inb(dev, ATA_DEV_CTL);

	while (((c = ide_inb(dev, ATA_STATUS)) & mask) != res) {
		/* break if error occurs (doesn't make sense to wait more) */
		if ((c & ATA_STAT_ERR) == ATA_STAT_ERR)
			break;
		udelay(100);
		if (delay-- == 0)
			break;
	}
	return (c);
}

/*
 * issue an atapi command
 */
unsigned char atapi_issue(int device, unsigned char *ccb, int ccblen,
			  unsigned char *buffer, int buflen)
{
	unsigned char c, err, mask, res;
	int n;

	ide_led(DEVICE_LED(device), 1);	/* LED on       */

	/* Select device
	 */
	mask = ATA_STAT_BUSY | ATA_STAT_DRQ;
	res = 0;
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));
	c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);
	if ((c & mask) != res) {
		printf("ATAPI_ISSUE: device %d not ready status %X\n", device,
		       c);
		err = 0xFF;
		goto AI_OUT;
	}
	/* write taskfile */
	ide_outb(device, ATA_ERROR_REG, 0);	/* no DMA, no overlaped */
	ide_outb(device, ATA_SECT_CNT, 0);
	ide_outb(device, ATA_SECT_NUM, 0);
	ide_outb(device, ATA_CYL_LOW, (unsigned char) (buflen & 0xFF));
	ide_outb(device, ATA_CYL_HIGH,
		 (unsigned char) ((buflen >> 8) & 0xFF));
	ide_outb(device, ATA_DEV_HD, ATA_LBA | ATA_DEVICE(device));

	ide_outb(device, ATA_COMMAND, ATAPI_CMD_PACKET);
	udelay(50);

	mask = ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR;
	res = ATA_STAT_DRQ;
	c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);

	if ((c & mask) != res) {	/* DRQ must be 1, BSY 0 */
		printf("ATAPI_ISSUE: Error (no IRQ) before sending ccb dev %d status 0x%02x\n",
			device, c);
		err = 0xFF;
		goto AI_OUT;
	}

	/* write command block */
	ide_output_data_shorts(device, (unsigned short *) ccb, ccblen / 2);

	/* ATAPI Command written wait for completition */
	udelay(5000);		/* device must set bsy */

	mask = ATA_STAT_DRQ | ATA_STAT_BUSY | ATA_STAT_ERR;
	/*
	 * if no data wait for DRQ = 0 BSY = 0
	 * if data wait for DRQ = 1 BSY = 0
	 */
	res = 0;
	if (buflen)
		res = ATA_STAT_DRQ;
	c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);
	if ((c & mask) != res) {
		if (c & ATA_STAT_ERR) {
			err = (ide_inb(device, ATA_ERROR_REG)) >> 4;
			debug("atapi_issue 1 returned sense key %X status %02X\n",
				err, c);
		} else {
			printf("ATAPI_ISSUE: (no DRQ) after sending ccb (%x)  status 0x%02x\n",
				ccb[0], c);
			err = 0xFF;
		}
		goto AI_OUT;
	}
	n = ide_inb(device, ATA_CYL_HIGH);
	n <<= 8;
	n += ide_inb(device, ATA_CYL_LOW);
	if (n > buflen) {
		printf("ERROR, transfer bytes %d requested only %d\n", n,
		       buflen);
		err = 0xff;
		goto AI_OUT;
	}
	if ((n == 0) && (buflen < 0)) {
		printf("ERROR, transfer bytes %d requested %d\n", n, buflen);
		err = 0xff;
		goto AI_OUT;
	}
	if (n != buflen) {
		debug("WARNING, transfer bytes %d not equal with requested %d\n",
			n, buflen);
	}
	if (n != 0) {		/* data transfer */
		debug("ATAPI_ISSUE: %d Bytes to transfer\n", n);
		/* we transfer shorts */
		n >>= 1;
		/* ok now decide if it is an in or output */
		if ((ide_inb(device, ATA_SECT_CNT) & 0x02) == 0) {
			debug("Write to device\n");
			ide_output_data_shorts(device,
				(unsigned short *) buffer, n);
		} else {
			debug("Read from device @ %p shorts %d\n", buffer, n);
			ide_input_data_shorts(device,
				(unsigned short *) buffer, n);
		}
	}
	udelay(5000);		/* seems that some CD ROMs need this... */
	mask = ATA_STAT_BUSY | ATA_STAT_ERR;
	res = 0;
	c = atapi_wait_mask(device, ATAPI_TIME_OUT, mask, res);
	if ((c & ATA_STAT_ERR) == ATA_STAT_ERR) {
		err = (ide_inb(device, ATA_ERROR_REG) >> 4);
		debug("atapi_issue 2 returned sense key %X status %X\n", err,
		      c);
	} else {
		err = 0;
	}
AI_OUT:
	ide_led(DEVICE_LED(device), 0);	/* LED off      */
	return (err);
}

/*
 * sending the command to atapi_issue. If an status other than good
 * returns, an request_sense will be issued
 */

#define ATAPI_DRIVE_NOT_READY	100
#define ATAPI_UNIT_ATTN		10

unsigned char atapi_issue_autoreq(int device,
				  unsigned char *ccb,
				  int ccblen,
				  unsigned char *buffer, int buflen)
{
	unsigned char sense_data[18], sense_ccb[12];
	unsigned char res, key, asc, ascq;
	int notready, unitattn;

	unitattn = ATAPI_UNIT_ATTN;
	notready = ATAPI_DRIVE_NOT_READY;

retry:
	res = atapi_issue(device, ccb, ccblen, buffer, buflen);
	if (res == 0)
		return 0;	/* Ok */

	if (res == 0xFF)
		return 0xFF;	/* error */

	debug("(auto_req)atapi_issue returned sense key %X\n", res);

	memset(sense_ccb, 0, sizeof(sense_ccb));
	memset(sense_data, 0, sizeof(sense_data));
	sense_ccb[0] = ATAPI_CMD_REQ_SENSE;
	sense_ccb[4] = 18;	/* allocation Length */

	res = atapi_issue(device, sense_ccb, 12, sense_data, 18);
	key = (sense_data[2] & 0xF);
	asc = (sense_data[12]);
	ascq = (sense_data[13]);

	debug("ATAPI_CMD_REQ_SENSE returned %x\n", res);
	debug(" Sense page: %02X key %02X ASC %02X ASCQ %02X\n",
	      sense_data[0], key, asc, ascq);

	if ((key == 0))
		return 0;	/* ok device ready */

	if ((key == 6) || (asc == 0x29) || (asc == 0x28)) { /* Unit Attention */
		if (unitattn-- > 0) {
			udelay(200 * 1000);
			goto retry;
		}
		printf("Unit Attention, tried %d\n", ATAPI_UNIT_ATTN);
		goto error;
	}
	if ((asc == 0x4) && (ascq == 0x1)) {
		/* not ready, but will be ready soon */
		if (notready-- > 0) {
			udelay(200 * 1000);
			goto retry;
		}
		printf("Drive not ready, tried %d times\n",
		       ATAPI_DRIVE_NOT_READY);
		goto error;
	}
	if (asc == 0x3a) {
		debug("Media not present\n");
		goto error;
	}

	printf("ERROR: Unknown Sense key %02X ASC %02X ASCQ %02X\n", key, asc,
	       ascq);
error:
	debug("ERROR Sense key %02X ASC %02X ASCQ %02X\n", key, asc, ascq);
	return (0xFF);
}


static void atapi_inquiry(block_dev_desc_t *dev_desc)
{
	unsigned char ccb[12];	/* Command descriptor block */
	unsigned char iobuf[64];	/* temp buf */
	unsigned char c;
	int device;

	device = dev_desc->dev;
	dev_desc->type = DEV_TYPE_UNKNOWN;	/* not yet valid */
	dev_desc->block_read = atapi_read;

	memset(ccb, 0, sizeof(ccb));
	memset(iobuf, 0, sizeof(iobuf));

	ccb[0] = ATAPI_CMD_INQUIRY;
	ccb[4] = 40;		/* allocation Legnth */
	c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *) iobuf, 40);

	debug("ATAPI_CMD_INQUIRY returned %x\n", c);
	if (c != 0)
		return;

	/* copy device ident strings */
	ident_cpy((unsigned char *) dev_desc->vendor, &iobuf[8], 8);
	ident_cpy((unsigned char *) dev_desc->product, &iobuf[16], 16);
	ident_cpy((unsigned char *) dev_desc->revision, &iobuf[32], 5);

	dev_desc->lun = 0;
	dev_desc->lba = 0;
	dev_desc->blksz = 0;
	dev_desc->log2blksz = LOG2_INVALID(typeof(dev_desc->log2blksz));
	dev_desc->type = iobuf[0] & 0x1f;

	if ((iobuf[1] & 0x80) == 0x80)
		dev_desc->removable = 1;
	else
		dev_desc->removable = 0;

	memset(ccb, 0, sizeof(ccb));
	memset(iobuf, 0, sizeof(iobuf));
	ccb[0] = ATAPI_CMD_START_STOP;
	ccb[4] = 0x03;		/* start */

	c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *) iobuf, 0);

	debug("ATAPI_CMD_START_STOP returned %x\n", c);
	if (c != 0)
		return;

	memset(ccb, 0, sizeof(ccb));
	memset(iobuf, 0, sizeof(iobuf));
	c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *) iobuf, 0);

	debug("ATAPI_CMD_UNIT_TEST_READY returned %x\n", c);
	if (c != 0)
		return;

	memset(ccb, 0, sizeof(ccb));
	memset(iobuf, 0, sizeof(iobuf));
	ccb[0] = ATAPI_CMD_READ_CAP;
	c = atapi_issue_autoreq(device, ccb, 12, (unsigned char *) iobuf, 8);
	debug("ATAPI_CMD_READ_CAP returned %x\n", c);
	if (c != 0)
		return;

	debug("Read Cap: LBA %02X%02X%02X%02X blksize %02X%02X%02X%02X\n",
	      iobuf[0], iobuf[1], iobuf[2], iobuf[3],
	      iobuf[4], iobuf[5], iobuf[6], iobuf[7]);

	dev_desc->lba = ((unsigned long) iobuf[0] << 24) +
		((unsigned long) iobuf[1] << 16) +
		((unsigned long) iobuf[2] << 8) + ((unsigned long) iobuf[3]);
	dev_desc->blksz = ((unsigned long) iobuf[4] << 24) +
		((unsigned long) iobuf[5] << 16) +
		((unsigned long) iobuf[6] << 8) + ((unsigned long) iobuf[7]);
	dev_desc->log2blksz = LOG2(dev_desc->blksz);
#ifdef CONFIG_LBA48
	/* ATAPI devices cannot use 48bit addressing (ATA/ATAPI v7) */
	dev_desc->lba48 = 0;
#endif
	return;
}


/*
 * atapi_read:
 * we transfer only one block per command, since the multiple DRQ per
 * command is not yet implemented
 */
#define ATAPI_READ_MAX_BYTES	2048	/* we read max 2kbytes */
#define ATAPI_READ_BLOCK_SIZE	2048	/* assuming CD part */
#define ATAPI_READ_MAX_BLOCK	(ATAPI_READ_MAX_BYTES/ATAPI_READ_BLOCK_SIZE)

ulong atapi_read(int device, ulong blknr, lbaint_t blkcnt, void *buffer)
{
	ulong n = 0;
	unsigned char ccb[12];	/* Command descriptor block */
	ulong cnt;

	debug("atapi_read dev %d start %lX, blocks " LBAF " buffer at %lX\n",
	      device, blknr, blkcnt, (ulong) buffer);

	do {
		if (blkcnt > ATAPI_READ_MAX_BLOCK)
			cnt = ATAPI_READ_MAX_BLOCK;
		else
			cnt = blkcnt;

		ccb[0] = ATAPI_CMD_READ_12;
		ccb[1] = 0;	/* reserved */
		ccb[2] = (unsigned char) (blknr >> 24) & 0xFF;	/* MSB Block */
		ccb[3] = (unsigned char) (blknr >> 16) & 0xFF;	/*  */
		ccb[4] = (unsigned char) (blknr >> 8) & 0xFF;
		ccb[5] = (unsigned char) blknr & 0xFF;	/* LSB Block */
		ccb[6] = (unsigned char) (cnt >> 24) & 0xFF; /* MSB Block cnt */
		ccb[7] = (unsigned char) (cnt >> 16) & 0xFF;
		ccb[8] = (unsigned char) (cnt >> 8) & 0xFF;
		ccb[9] = (unsigned char) cnt & 0xFF;	/* LSB Block */
		ccb[10] = 0;	/* reserved */
		ccb[11] = 0;	/* reserved */

		if (atapi_issue_autoreq(device, ccb, 12,
					(unsigned char *) buffer,
					cnt * ATAPI_READ_BLOCK_SIZE)
		    == 0xFF) {
			return (n);
		}
		n += cnt;
		blkcnt -= cnt;
		blknr += cnt;
		buffer += (cnt * ATAPI_READ_BLOCK_SIZE);
	} while (blkcnt > 0);
	return (n);
}

/* ------------------------------------------------------------------------- */

#endif /* CONFIG_ATAPI */

U_BOOT_CMD(ide, 5, 1, do_ide,
	   "IDE sub-system",
	   "reset - reset IDE controller\n"
	   "ide info  - show available IDE devices\n"
	   "ide device [dev] - show or set current device\n"
	   "ide part [dev] - print partition table of one or all IDE devices\n"
	   "ide read  addr blk# cnt\n"
	   "ide write addr blk# cnt - read/write `cnt'"
	   " blocks starting at block `blk#'\n"
	   "    to/from memory address `addr'");

U_BOOT_CMD(diskboot, 3, 1, do_diskboot,
	   "boot from IDE device", "loadAddr dev:part");