libata: PIIX3 support

This I believe completes the PIIX range of support for libata

This adds the table entries needed for the PIIX3, both a new PCI
identifier and a new mode list. It also fixes an erroneous access to PCI
configuration 0x48 on non UDMA capable chips.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/ata_piix.c

@@ -118,7 +118,7 @@ enum {
 	PIIX_80C_SEC		= (1 << 7) | (1 << 6),
 
 	/* controller IDs */
-	piix_pata_33		= 0,	/* PIIX3 or 4 at 33Mhz */
+	piix_pata_33		= 0,	/* PIIX4 at 33Mhz */
 	ich_pata_33		= 1,	/* ICH up to UDMA 33 only */
 	ich_pata_66		= 2,	/* ICH up to 66 Mhz */
 	ich_pata_100		= 3,	/* ICH up to UDMA 100 */
@@ -128,6 +128,7 @@ enum {
 	ich6_sata_ahci		= 7,
 	ich6m_sata_ahci		= 8,
 	ich8_sata_ahci		= 9,
+	piix_pata_mwdma		= 10,	/* PIIX3 MWDMA only */
 
 	/* constants for mapping table */
 	P0			= 0,  /* port 0 */
@@ -165,6 +166,8 @@ static unsigned int in_module_init = 1;
 
 static const struct pci_device_id piix_pci_tbl[] = {
 #ifdef ATA_ENABLE_PATA
+	/* Intel PIIX3 for the 430HX etc */
+	{ 0x8086, 0x7010, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix_pata_mwdma },
 	/* Intel PIIX4 for the 430TX/440BX/MX chipset: UDMA 33 */
 	/* Also PIIX4E (fn3 rev 2) and PIIX4M (fn3 rev 3) */
 	{ 0x8086, 0x7111, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix_pata_33 },
@@ -441,7 +444,7 @@ static const struct piix_map_db *piix_map_db_table[] = {
 };
 
 static struct ata_port_info piix_port_info[] = {
-	/* piix_pata_33: 0:  PIIX3 or 4 at 33MHz */
+	/* piix_pata_33: 0:  PIIX4 at 33MHz */
 	{
 		.sht		= &piix_sht,
 		.flags		= PIIX_PATA_FLAGS,
@@ -543,6 +546,14 @@ static struct ata_port_info piix_port_info[] = {
 		.port_ops	= &piix_sata_ops,
 	},
 
+	/* piix_pata_mwdma: 10:  PIIX3 MWDMA only */
+	{
+		.sht		= &piix_sht,
+		.flags		= PIIX_PATA_FLAGS,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x06, /* mwdma1-2 ?? CHECK 0 should be ok but slow */
+		.port_ops	= &piix_pata_ops,
+	},
 };
 
 static struct pci_bits piix_enable_bits[] = {
@@ -787,6 +798,7 @@ static void do_pata_set_dmamode (struct ata_port *ap, struct ata_device *adev, i
 			    { 2, 3 }, };
 
 	pci_read_config_word(dev, master_port, &master_data);
+	if (ap->udma_mask)
 		pci_read_config_byte(dev, 0x48, &udma_enable);
 
 	if (speed >= XFER_UDMA_0) {