1 files changed, 15 insertions, 3 deletions

diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index aadfcb3ceb1b..33bbeac785cc 100644
--- a/drivers/ata/ata_piix.c
+++ b/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[] = {
@@ -787,7 +798,8 @@ 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);
-        pci_read_config_byte(dev, 0x48, &udma_enable);
+        if (ap->udma_mask)
+                pci_read_config_byte(dev, 0x48, &udma_enable);
 
         if (speed >= XFER_UDMA_0) {
                 unsigned int udma = adev->dma_mode - XFER_UDMA_0;