icside.c

em85xx的大硬盘修正代码包

	{ "Toshiba CD-ROM XM-6202B",		"ALL"		},
	{ "CD-532E-A",				"ALL"		},
	{ "E-IDE CD-ROM CR-840",		"ALL"		},
	{ "CD-ROM Drive/F5A",			"ALL"		},
	{ "RICOH CD-R/RW MP7083A",		"ALL"		},
	{ "WPI CDD-820",			"ALL"		},
	{ "SAMSUNG CD-ROM SC-148C",		"ALL"		},
	{ "SAMSUNG CD-ROM SC-148F",		"ALL"		},
	{ "SAMSUNG CD-ROM SC",			"ALL"		},
	{ "SanDisk SDP3B-64",			"ALL"		},
	{ "SAMSUNG CD-ROM SN-124",		"ALL"		},
	{ "PLEXTOR CD-R PX-W8432T",		"ALL"		},
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",	"ALL"		},
	{ "_NEC DV5800A",			"ALL"		},
	{ NULL,					0		}
};

static int in_drive_list(struct hd_driveid *id, struct drive_list_entry * drive_table)
{
	for ( ; drive_table->id_model ; drive_table++)
		if ((!strcmp(drive_table->id_model, id->model)) &&
		    ((!strstr(drive_table->id_firmware, id->fw_rev)) ||
		     (!strcmp(drive_table->id_firmware, "ALL"))))
			return 1;
	return 0;
}

/*
 *  For both Blacklisted and Whitelisted drives.
 *  This is setup to be called as an extern for future support
 *  to other special driver code.
 */
static int check_drive_lists(ide_drive_t *drive, int good_bad)
{
	struct hd_driveid *id = drive->id;

	if (good_bad) {
		return in_drive_list(id, drive_whitelist);
	} else {
		int blacklist = in_drive_list(id, drive_blacklist);
		if (blacklist)
			printk("%s: Disabling DMA for %s\n", drive->name, id->model);
		return(blacklist);
	}
	return 0;
}

static int
icside_dma_check(ide_drive_t *drive)
{
	struct hd_driveid *id = drive->id;
	ide_hwif_t *hwif = HWIF(drive);
	int autodma = hwif->autodma;
	int xfer_mode = XFER_PIO_2;
	int func = ide_dma_off_quietly;

	if (!id || !(id->capability & 1) || !autodma)
		goto out;

	/*
	 * Consult the list of known "bad" drives
	 */
	if (check_drive_lists(drive, 0)) {
		func = ide_dma_off;
		goto out;
	}

	/*
	 * Enable DMA on any drive that has multiword DMA
	 */
	if (id->field_valid & 2) {
		if (id->dma_mword & 4) {
			xfer_mode = XFER_MW_DMA_2;
			func = ide_dma_on;
		} else if (id->dma_mword & 2) {
			xfer_mode = XFER_MW_DMA_1;
			func = ide_dma_on;
		} else if (id->dma_mword & 1) {
			xfer_mode = XFER_MW_DMA_0;
			func = ide_dma_on;
		}
		goto out;
	}

	/*
	 * Consult the list of known "good" drives
	 */
	if (check_drive_lists(drive, 1)) {
		if (id->eide_dma_time > 150)
			goto out;
		xfer_mode = XFER_MW_DMA_1;
		func = ide_dma_on;
	}

out:
	func = icside_config_if(drive, xfer_mode);

	return hwif->dmaproc(func, drive);
}

static int
icside_dma_verbose(ide_drive_t *drive)
{
	printk(", DMA");
	return 1;
}

static int
icside_dmaproc(ide_dma_action_t func, ide_drive_t *drive)
{
	ide_hwif_t *hwif = HWIF(drive);
	int count, reading = 0;

	switch (func) {
	case ide_dma_off:
		printk("%s: DMA disabled\n", drive->name);
		/*FALLTHROUGH*/

	case ide_dma_off_quietly:
	case ide_dma_on:
		drive->using_dma = (func == ide_dma_on);
		return 0;

	case ide_dma_check:
		return icside_dma_check(drive);

	case ide_dma_read:
		reading = 1;
	case ide_dma_write:
		count = icside_build_dmatable(drive, reading);
		if (!count)
			return 1;
		disable_dma(hwif->hw.dma);

		/* Route the DMA signals to
		 * to the correct interface.
		 */
		outb(hwif->select_data, hwif->config_data);

		/* Select the correct timing
		 * for this drive
		 */
		set_dma_speed(hwif->hw.dma, drive->drive_data);

		set_dma_sg(hwif->hw.dma, HWIF(drive)->sg_table, count);
		set_dma_mode(hwif->hw.dma, reading ? DMA_MODE_READ
			     : DMA_MODE_WRITE);

		drive->waiting_for_dma = 1;
		if (drive->media != ide_disk)
			return 0;

		ide_set_handler(drive, &icside_dmaintr, WAIT_CMD, NULL);
		OUT_BYTE(reading ? WIN_READDMA : WIN_WRITEDMA,
			 IDE_COMMAND_REG);

	case ide_dma_begin:
		enable_dma(hwif->hw.dma);
		return 0;

	case ide_dma_end:
		drive->waiting_for_dma = 0;
		disable_dma(hwif->hw.dma);
		icside_destroy_dmatable(drive);
		return get_dma_residue(hwif->hw.dma) != 0;

	case ide_dma_test_irq:
		return inb((unsigned long)hwif->hw.priv) & 1;

	case ide_dma_bad_drive:
	case ide_dma_good_drive:
		return check_drive_lists(drive, (func == ide_dma_good_drive));

	case ide_dma_verbose:
		return icside_dma_verbose(drive);

	case ide_dma_timeout:
	default:
		printk("icside_dmaproc: unsupported %s func: %d\n",
			ide_dmafunc_verbose(func), func);
	}
	return 1;
}

static int
icside_setup_dma(ide_hwif_t *hwif, int autodma)
{
	printk("    %s: SG-DMA", hwif->name);

	hwif->sg_table = kmalloc(sizeof(struct scatterlist) * NR_ENTRIES,
				 GFP_KERNEL);
	if (!hwif->sg_table)
		goto failed;

	hwif->dmatable_cpu = NULL;
	hwif->dmatable_dma = 0;
	hwif->speedproc = icside_set_speed;
	hwif->dmaproc = icside_dmaproc;
	hwif->autodma = autodma;

	printk(" capable%s\n", autodma ?
		", auto-enable" : "");

	return 1;

failed:
	printk(" -- ERROR, unable to allocate DMA table\n");
	return 0;
}
#endif

static ide_hwif_t *
icside_find_hwif(unsigned long dataport)
{
	ide_hwif_t *hwif;
	int index;

	for (index = 0; index < MAX_HWIFS; ++index) {
		hwif = &ide_hwifs[index];
		if (hwif->io_ports[IDE_DATA_OFFSET] == (ide_ioreg_t)dataport)
			goto found;
	}

	for (index = 0; index < MAX_HWIFS; ++index) {
		hwif = &ide_hwifs[index];
		if (!hwif->io_ports[IDE_DATA_OFFSET])
			goto found;
	}

	return NULL;
found:
	return hwif;
}

static ide_hwif_t *
icside_setup(unsigned long base, struct cardinfo *info, int irq)
{
	unsigned long port = base + info->dataoffset;
	ide_hwif_t *hwif;

	hwif = icside_find_hwif(base);
	if (hwif) {
		int i;

		memset(&hwif->hw, 0, sizeof(hw_regs_t));

		for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
			hwif->hw.io_ports[i] = (ide_ioreg_t)port;
			hwif->io_ports[i] = (ide_ioreg_t)port;
			port += 1 << info->stepping;
		}
		hwif->hw.io_ports[IDE_CONTROL_OFFSET] = base + info->ctrloffset;
		hwif->io_ports[IDE_CONTROL_OFFSET] = base + info->ctrloffset;
		hwif->hw.irq  = irq;
		hwif->irq     = irq;
		hwif->hw.dma  = NO_DMA;
		hwif->noprobe = 0;
		hwif->chipset = ide_acorn;
	}

	return hwif;
}

static int __init icside_register_v5(struct expansion_card *ec, int autodma)
{
	unsigned long slot_port;
	ide_hwif_t *hwif;

	slot_port = ecard_address(ec, ECARD_MEMC, 0);

	ec->irqaddr  = (unsigned char *)ioaddr(slot_port + ICS_ARCIN_V5_INTRSTAT);
	ec->irqmask  = 1;
	ec->irq_data = (void *)slot_port;
	ec->ops      = (expansioncard_ops_t *)&icside_ops_arcin_v5;

	/*
	 * Be on the safe side - disable interrupts
	 */
	inb(slot_port + ICS_ARCIN_V5_INTROFFSET);

	hwif = icside_setup(slot_port, &icside_cardinfo_v5, ec->irq);

	return hwif ? 0 : -1;
}

static int __init icside_register_v6(struct expansion_card *ec, int autodma)
{
	unsigned long slot_port, port;
	ide_hwif_t *hwif, *mate;
	int sel = 0;

	slot_port = ecard_address(ec, ECARD_IOC, ECARD_FAST);
	port      = ecard_address(ec, ECARD_EASI, ECARD_FAST);

	if (port == 0)
		port = slot_port;
	else
		sel = 1 << 5;

	outb(sel, slot_port);

	ec->irq_data = (void *)port;
	ec->ops      = (expansioncard_ops_t *)&icside_ops_arcin_v6;

	/*
	 * Be on the safe side - disable interrupts
	 */
	inb(port + ICS_ARCIN_V6_INTROFFSET_1);
	inb(port + ICS_ARCIN_V6_INTROFFSET_2);

	hwif = icside_setup(port, &icside_cardinfo_v6_1, ec->irq);
	mate = icside_setup(port, &icside_cardinfo_v6_2, ec->irq);

#ifdef CONFIG_BLK_DEV_IDEDMA_ICS
	if (ec->dma != NO_DMA) {
		if (request_dma(ec->dma, hwif->name))
			goto no_dma;

		if (hwif) {
			hwif->config_data = slot_port;
			hwif->select_data = sel;
			hwif->hw.dma  = ec->dma;
			hwif->hw.priv = (void *)
					(port + ICS_ARCIN_V6_INTRSTAT_1);
			hwif->channel = 0;
			icside_setup_dma(hwif, autodma);
		}
		if (mate) {
			mate->config_data = slot_port;
			mate->select_data = sel | 1;
			mate->hw.dma  = ec->dma;
			mate->hw.priv = (void *)
					(port + ICS_ARCIN_V6_INTRSTAT_2);
			mate->channel = 1;
			icside_setup_dma(mate, autodma);
		}
	}
no_dma:
#endif
	return hwif || mate ? 0 : -1;
}

int __init icside_init(void)
{
	int autodma = 0;

#ifdef CONFIG_IDEDMA_ICS_AUTO
	autodma = 1;
#endif

	ecard_startfind ();

	do {
		struct expansion_card *ec;
		int result;

		ec = ecard_find(0, icside_cids);
		if (ec == NULL)
			break;

		ecard_claim(ec);

		switch (icside_identifyif(ec)) {
		case ics_if_arcin_v5:
			result = icside_register_v5(ec, autodma);
			break;

		case ics_if_arcin_v6:
			result = icside_register_v6(ec, autodma);
			break;

		default:
			result = -1;
			break;
		}

		if (result)
			ecard_release(ec);
	} while (1);

	return 0;
}