ide.c

ep9315平台下硬盘驱动的源码

 * "hdx=noremap"	: do not remap 0->1 even though EZD was detected
 * "hdx=autotune"	: driver will attempt to tune interface speed
 *				to the fastest PIO mode supported,
 *				if possible for this drive only.
 *				Not fully supported by all chipset types,
 *				and quite likely to cause trouble with
 *				older/odd IDE drives.
 *
 * "hdx=slow"		: insert a huge pause after each access to the data
 *				port. Should be used only as a last resort.
 *
 * "hdx=swapdata"	: when the drive is a disk, byte swap all data
 * "hdx=bswap"		: same as above..........
 * "hdxlun=xx"          : set the drive last logical unit.
 * "hdx=flash"		: allows for more than one ata_flash disk to be
 *				registered. In most cases, only one device
 *				will be present.
 * "hdx=scsi"		: the return of the ide-scsi flag, this is useful for
 *				allowwing ide-floppy, ide-tape, and ide-cdrom|writers
 *				to use ide-scsi emulation on a device specific option.
 * "idebus=xx"		: inform IDE driver of VESA/PCI bus speed in MHz,
 *				where "xx" is between 20 and 66 inclusive,
 *				used when tuning chipset PIO modes.
 *				For PCI bus, 25 is correct for a P75 system,
 *				30 is correct for P90,P120,P180 systems,
 *				and 33 is used for P100,P133,P166 systems.
 *				If in doubt, use idebus=33 for PCI.
 *				As for VLB, it is safest to not specify it.
 *
 * "idex=noprobe"	: do not attempt to access/use this interface
 * "idex=base"		: probe for an interface at the addr specified,
 *				where "base" is usually 0x1f0 or 0x170
 *				and "ctl" is assumed to be "base"+0x206
 * "idex=base,ctl"	: specify both base and ctl
 * "idex=base,ctl,irq"	: specify base, ctl, and irq number
 * "idex=autotune"	: driver will attempt to tune interface speed
 *				to the fastest PIO mode supported,
 *				for all drives on this interface.
 *				Not fully supported by all chipset types,
 *				and quite likely to cause trouble with
 *				older/odd IDE drives.
 * "idex=noautotune"	: driver will NOT attempt to tune interface speed
 *				This is the default for most chipsets,
 *				except the cmd640.
 * "idex=serialize"	: do not overlap operations on idex and ide(x^1)
 * "idex=four"		: four drives on idex and ide(x^1) share same ports
 * "idex=reset"		: reset interface before first use
 * "idex=dma"		: enable DMA by default on both drives if possible
 * "idex=ata66"		: informs the interface that it has an 80c cable
 *				for chipsets that are ATA-66 capable, but
 *				the ablity to bit test for detection is
 *				currently unknown.
 * "ide=reverse"	: Formerly called to pci sub-system, but now local.
 *
 * The following are valid ONLY on ide0, (except dc4030)
 * and the defaults for the base,ctl ports must not be altered.
 *
 * "ide0=dtc2278"	: probe/support DTC2278 interface
 * "ide0=ht6560b"	: probe/support HT6560B interface
 * "ide0=cmd640_vlb"	: *REQUIRED* for VLB cards with the CMD640 chip
 *			  (not for PCI -- automatically detected)
 * "ide0=qd65xx"	: probe/support qd65xx interface
 * "ide0=ali14xx"	: probe/support ali14xx chipsets (ALI M1439, M1443, M1445)
 * "ide0=umc8672"	: probe/support umc8672 chipsets
 * "idex=dc4030"	: probe/support Promise DC4030VL interface
 * "ide=doubler"	: probe/support IDE doublers on Amiga
 */
int __init ide_setup (char *s)
{
	int i, vals[3];
	ide_hwif_t *hwif;
	ide_drive_t *drive;
	unsigned int hw, unit;
	const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
	const char max_hwif  = '0' + (MAX_HWIFS - 1);

	
	if (strncmp(s,"hd",2) == 0 && s[2] == '=')	/* hd= is for hd.c   */
		return 0;				/* driver and not us */

	if (strncmp(s,"ide",3) &&
	    strncmp(s,"idebus",6) &&
	    strncmp(s,"hd",2))		/* hdx= & hdxlun= */
		return 0;

	printk(KERN_INFO "ide_setup: %s", s);
	init_ide_data ();

#ifdef CONFIG_BLK_DEV_IDEDOUBLER
	if (!strcmp(s, "ide=doubler")) {
		extern int ide_doubler;

		printk(" : Enabled support for IDE doublers\n");
		ide_doubler = 1;
		return 1;
	}
#endif /* CONFIG_BLK_DEV_IDEDOUBLER */

	if (!strcmp(s, "ide=nodma")) {
		printk(" : Prevented DMA\n");
		noautodma = 1;
		return 1;
	}

#ifdef CONFIG_BLK_DEV_IDEPCI
	if (!strcmp(s, "ide=reverse")) {
		ide_scan_direction = 1;
		printk(" : Enabled support for IDE inverse scan order.\n");
		return 1;
	}
#endif /* CONFIG_BLK_DEV_IDEPCI */

	/*
	 * Look for drive options:  "hdx="
	 */
	if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
		const char *hd_words[] = {"none", "noprobe", "nowerr", "cdrom",
				"serialize", "autotune", "noautotune",
				"slow", "swapdata", "bswap", "flash",
				"remap", "noremap", "scsi", NULL};
		unit = s[2] - 'a';
		hw   = unit / MAX_DRIVES;
		unit = unit % MAX_DRIVES;
		hwif = &ide_hwifs[hw];
		drive = &hwif->drives[unit];
		if (strncmp(s + 4, "ide-", 4) == 0) {
			strncpy(drive->driver_req, s + 4, 9);
			goto done;
		}
		/*
		 * Look for last lun option:  "hdxlun="
		 */
		if (s[3] == 'l' && s[4] == 'u' && s[5] == 'n') {
			if (match_parm(&s[6], NULL, vals, 1) != 1)
				goto bad_option;
			if (vals[0] >= 0 && vals[0] <= 7) {
				drive->last_lun = vals[0];
				drive->forced_lun = 1;
			} else
				printk(" -- BAD LAST LUN! Expected value from 0 to 7");
			goto done;
		}
		switch (match_parm(&s[3], hd_words, vals, 3)) {
			case -1: /* "none" */
				drive->nobios = 1;  /* drop into "noprobe" */
			case -2: /* "noprobe" */
				drive->noprobe = 1;
				goto done;
			case -3: /* "nowerr" */
				drive->bad_wstat = BAD_R_STAT;
				hwif->noprobe = 0;
				goto done;
			case -4: /* "cdrom" */
				drive->present = 1;
				drive->media = ide_cdrom;
				hwif->noprobe = 0;
				goto done;
			case -5: /* "serialize" */
				printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
				goto do_serialize;
			case -6: /* "autotune" */
				drive->autotune = 1;
				goto done;
			case -7: /* "noautotune" */
				drive->autotune = 2;
				goto done;
			case -8: /* "slow" */
				drive->slow = 1;
				goto done;
			case -9: /* "swapdata" or "bswap" */
			case -10:
				drive->bswap = 1;
				goto done;
			case -11: /* "flash" */
				drive->ata_flash = 1;
				goto done;
			case -12: /* "remap" */
				drive->remap_0_to_1 = 1;
				goto done;
			case -13: /* "noremap" */
				drive->remap_0_to_1 = 2;
				goto done;
			case -14: /* "scsi" */
				drive->scsi = 1;
				goto done;
			case 3: /* cyl,head,sect */
				drive->media	= ide_disk;
				drive->cyl	= drive->bios_cyl  = vals[0];
				drive->head	= drive->bios_head = vals[1];
				drive->sect	= drive->bios_sect = vals[2];
				drive->present	= 1;
				drive->forced_geom = 1;
				hwif->noprobe = 0;
				goto done;
			default:
				goto bad_option;
		}
	}

	if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
		goto bad_option;
	/*
	 * Look for bus speed option:  "idebus="
	 */
	if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
		if (match_parm(&s[6], NULL, vals, 1) != 1)
			goto bad_option;
		if (vals[0] >= 20 && vals[0] <= 66) {
			idebus_parameter = vals[0];
		} else
			printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
		goto done;
	}
	/*
	 * Look for interface options:  "idex="
	 */
	if (s[3] >= '0' && s[3] <= max_hwif) {
		/*
		 * Be VERY CAREFUL changing this: note hardcoded indexes below
		 * -8,-9,-10 : are reserved for future idex calls to ease the hardcoding.
		 */
		const char *ide_words[] = {
			"noprobe", "serialize", "autotune", "noautotune", "reset", "dma", "ata66",
			"minus8", "minus9", "minus10",
			"four", "qd65xx", "ht6560b", "cmd640_vlb", "dtc2278", "umc8672", "ali14xx", "dc4030", NULL };
		hw = s[3] - '0';
		hwif = &ide_hwifs[hw];
		i = match_parm(&s[4], ide_words, vals, 3);

		/*
		 * Cryptic check to ensure chipset not already set for hwif:
		 */
		if (i > 0 || i <= -11) {			/* is parameter a chipset name? */
			if (hwif->chipset != ide_unknown)
				goto bad_option;	/* chipset already specified */
			if (i <= -11 && i != -18 && hw != 0)
				goto bad_hwif;		/* chipset drivers are for "ide0=" only */
			if (i <= -11 && i != -18 && ide_hwifs[hw+1].chipset != ide_unknown)
				goto bad_option;	/* chipset for 2nd port already specified */
			printk("\n");
		}

		switch (i) {
#ifdef CONFIG_BLK_DEV_PDC4030
			case -18: /* "dc4030" */
			{
				extern void init_pdc4030(void);
				init_pdc4030();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_PDC4030 */
#ifdef CONFIG_BLK_DEV_ALI14XX
			case -17: /* "ali14xx" */
			{
				extern void init_ali14xx (void);
				init_ali14xx();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_ALI14XX */
#ifdef CONFIG_BLK_DEV_UMC8672
			case -16: /* "umc8672" */
			{
				extern void init_umc8672 (void);
				init_umc8672();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_UMC8672 */
#ifdef CONFIG_BLK_DEV_DTC2278
			case -15: /* "dtc2278" */
			{
				extern void init_dtc2278 (void);
				init_dtc2278();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_DTC2278 */
#ifdef CONFIG_BLK_DEV_CMD640
			case -14: /* "cmd640_vlb" */
			{
				extern int cmd640_vlb; /* flag for cmd640.c */
				cmd640_vlb = 1;
				goto done;
			}
#endif /* CONFIG_BLK_DEV_CMD640 */
#ifdef CONFIG_BLK_DEV_HT6560B
			case -13: /* "ht6560b" */
			{
				extern void init_ht6560b (void);
				init_ht6560b();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_HT6560B */
#if CONFIG_BLK_DEV_QD65XX
			case -12: /* "qd65xx" */
			{
				extern void init_qd65xx (void);
				init_qd65xx();
				goto done;
			}
#endif /* CONFIG_BLK_DEV_QD65XX */
#ifdef CONFIG_BLK_DEV_4DRIVES
			case -11: /* "four" drives on one set of ports */
			{
				ide_hwif_t *mate = &ide_hwifs[hw^1];
				mate->drives[0].select.all ^= 0x20;
				mate->drives[1].select.all ^= 0x20;
				hwif->chipset = mate->chipset = ide_4drives;
				mate->irq = hwif->irq;
				memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
				goto do_serialize;
			}
#endif /* CONFIG_BLK_DEV_4DRIVES */
			case -10: /* minus10 */
			case -9: /* minus9 */
			case -8: /* minus8 */
				goto bad_option;
			case -7: /* ata66 */
#ifdef CONFIG_BLK_DEV_IDEPCI
				hwif->udma_four = 1;
				goto done;
#else /* !CONFIG_BLK_DEV_IDEPCI */
				hwif->udma_four = 0;
				goto bad_hwif;
#endif /* CONFIG_BLK_DEV_IDEPCI */
			case -6: /* dma */
				hwif->autodma = 1;
				goto done;
			case -5: /* "reset" */
				hwif->reset = 1;
				goto done;
			case -4: /* "noautotune" */
				hwif->drives[0].autotune = 2;
				hwif->drives[1].autotune = 2;
				goto done;
			case -3: /* "autotune" */
				hwif->drives[0].autotune = 1;
				hwif->drives[1].autotune = 1;
				goto done;
			case -2: /* "serialize" */
			do_serialize:
				hwif->mate = &ide_hwifs[hw^1];
				hwif->mate->mate = hwif;
				hwif->serialized = hwif->mate->serialized = 1;
				goto done;

			case -1: /* "noprobe" */
				hwif->noprobe = 1;
				goto done;

			case 1:	/* base */
				vals[1] = vals[0] + 0x206; /* default ctl */
			case 2: /* base,ctl */
				vals[2] = 0;	/* default irq = probe for it */
			case 3: /* base,ctl,irq */
				hwif->hw.irq = vals[2];
				ide_init_hwif_ports(&hwif->hw, (ide_ioreg_t) vals[0], (ide_ioreg_t) vals[1], &hwif->irq);
				memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
				hwif->irq      = vals[2];
				hwif->noprobe  = 0;
				hwif->chipset  = ide_generic;
				goto done;

			case 0: goto bad_option;
			default:
				printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
				return 1;
		}
	}
bad_option:
	printk(" -- BAD OPTION\n");
	return 1;
bad_hwif:
	printk("-- NOT SUPPORTED ON ide%d", hw);
done:
	printk("\n");
	return 1;
}

/*
 * probe_for_hwifs() finds/initializes "known" IDE interfaces
 */
static void __init probe_for_hwifs (void)
{
#ifdef CONFIG_BLK_DEV_IDEPCI
	if (pci_present())
	{
		ide_scan_pcibus(ide_scan_direction);
	}
#endif /* CONFIG_BLK_DEV_IDEPCI */

#ifdef CONFIG_ETRAX_IDE
	{
		extern void init_e100_ide(void);
		init_e100_ide();
	}
#endif /* CONFIG_ETRAX_IDE */
#ifdef CONFIG_BLK_DEV_CMD640
	{
		extern void ide_probe_for_cmd640x(void);
		ide_probe_for_cmd640x();
	}
#endif /* CONFIG_BLK_DEV_CMD640 */
#ifdef CONFIG_BLK_DEV_PDC4030
	{
		extern int ide_probe_for_pdc4030(void);
		(void) ide_probe_for_pdc4030();
	}
#endif /* CONFIG_BLK_DEV_PDC4030 */
#ifdef CONFIG_BLK_DEV_IDE_PMAC
	{
		extern void pmac_ide_probe(void);
		pmac_ide_probe();
	}
#endif /* CONFIG_BLK_DEV_IDE_PMAC */
#ifdef CONFIG_BLK_DEV_IDE_SIBYTE
	{
		extern void sibyte_ide_probe(void);
		sibyte_ide_probe();
	}
#endif /* CONFIG_BLK_DEV_IDE_SIBYTE */
#ifdef CONFIG_BLK_DEV_IDE_ICSIDE
	{
		extern void icside_init(void);
		icside_init();
	}
#endif /* CONFIG_BLK_DEV_IDE_ICSIDE */
#ifdef CONFIG_BLK_DEV_IDE_RAPIDE
	{
		extern void rapide_init(void);
		rapide_init();
	}
#endif /* CONFIG_BLK_DEV_IDE_RAPIDE */
#ifdef CONFIG_BLK_DEV_IDE_RISCSTATION
	{
	    extern void rside_init(void);
	    rside_init();
	}
#endif /* CONFIG_BLK_DEV_IDE_RISCSTATION */
#ifdef CONFIG_BLK_DEV_GAYLE
	{
		extern void gayle_init(void);
		gayle_init();
	}
#endif /* CONFIG_BLK_DEV_GAYLE */
#ifdef CONFIG_BLK_DEV_FALCON_IDE
	{
		extern void falconide_init(void);
		falconide_init();
	}
#endif /* CONFIG_BLK_DEV_FALCON_IDE */
#ifdef CONFIG_BLK_DEV_MAC_IDE
	{
		extern void macide_init(void);
		macide_init();
	}
#endif /* CONFIG_BLK_DEV_MAC_IDE */
#ifdef CONFIG_BLK_DEV_Q40IDE
	{
		extern void q40ide_init(void);
		q40ide_init();
	}
#endif /* CONFIG_BLK_DEV_