cmd_ide.c

 * 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	/* max blocks */

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

	AT_PRINTF("atapi_read dev %d start %lX, blocks %lX 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 count */
		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/4); /* ulong blocksize in ulong */
	} while (blkcnt > 0);
	return (n);
}

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

#endif /* CONFIG_ATAPI */

U_BOOT_CMD(
	ide,  5,  1,  do_ide,
	"ide     - IDE sub-system\n",
	"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'\n"
);

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

#endif	/* CONFIG_COMMANDS & CFG_CMD_IDE */