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Diffstat (limited to 'drivers/scsi/ata_piix.c')
-rw-r--r--drivers/scsi/ata_piix.c127
1 files changed, 93 insertions, 34 deletions
diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c
index 333d69dd84e..0ea27873b9f 100644
--- a/drivers/scsi/ata_piix.c
+++ b/drivers/scsi/ata_piix.c
@@ -37,6 +37,49 @@
*
* Hardware documentation available at http://developer.intel.com/
*
+ * Documentation
+ * Publically available from Intel web site. Errata documentation
+ * is also publically available. As an aide to anyone hacking on this
+ * driver the list of errata that are relevant is below.going back to
+ * PIIX4. Older device documentation is now a bit tricky to find.
+ *
+ * The chipsets all follow very much the same design. The orginal Triton
+ * series chipsets do _not_ support independant device timings, but this
+ * is fixed in Triton II. With the odd mobile exception the chips then
+ * change little except in gaining more modes until SATA arrives. This
+ * driver supports only the chips with independant timing (that is those
+ * with SITRE and the 0x44 timing register). See pata_oldpiix and pata_mpiix
+ * for the early chip drivers.
+ *
+ * Errata of note:
+ *
+ * Unfixable
+ * PIIX4 errata #9 - Only on ultra obscure hw
+ * ICH3 errata #13 - Not observed to affect real hw
+ * by Intel
+ *
+ * Things we must deal with
+ * PIIX4 errata #10 - BM IDE hang with non UDMA
+ * (must stop/start dma to recover)
+ * 440MX errata #15 - As PIIX4 errata #10
+ * PIIX4 errata #15 - Must not read control registers
+ * during a PIO transfer
+ * 440MX errata #13 - As PIIX4 errata #15
+ * ICH2 errata #21 - DMA mode 0 doesn't work right
+ * ICH0/1 errata #55 - As ICH2 errata #21
+ * ICH2 spec c #9 - Extra operations needed to handle
+ * drive hotswap [NOT YET SUPPORTED]
+ * ICH2 spec c #20 - IDE PRD must not cross a 64K boundary
+ * and must be dword aligned
+ * ICH2 spec c #24 - UDMA mode 4,5 t85/86 should be 6ns not 3.3
+ *
+ * Should have been BIOS fixed:
+ * 450NX: errata #19 - DMA hangs on old 450NX
+ * 450NX: errata #20 - DMA hangs on old 450NX
+ * 450NX: errata #25 - Corruption with DMA on old 450NX
+ * ICH3 errata #15 - IDE deadlock under high load
+ * (BIOS must set dev 31 fn 0 bit 23)
+ * ICH3 errata #18 - Don't use native mode
*/
#include <linux/kernel.h>
@@ -78,9 +121,7 @@ enum {
ich5_sata = 1,
piix4_pata = 2,
ich6_sata = 3,
- ich6_sata_rm = 4,
- ich7_sata = 5,
- esb2_sata = 6,
+ ich6_sata_ahci = 4,
PIIX_AHCI_DEVICE = 6,
};
@@ -111,11 +152,11 @@ static const struct pci_device_id piix_pci_tbl[] = {
{ 0x8086, 0x25a3, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },
{ 0x8086, 0x25b0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },
{ 0x8086, 0x2651, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata },
- { 0x8086, 0x2652, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_rm },
- { 0x8086, 0x2653, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_rm },
- { 0x8086, 0x27c0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich7_sata },
- { 0x8086, 0x27c4, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich7_sata },
- { 0x8086, 0x2680, PCI_ANY_ID, PCI_ANY_ID, 0, 0, esb2_sata },
+ { 0x8086, 0x2652, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_ahci },
+ { 0x8086, 0x2653, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_ahci },
+ { 0x8086, 0x27c0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_ahci },
+ { 0x8086, 0x27c4, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_ahci },
+ { 0x8086, 0x2680, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_ahci },
{ } /* terminate list */
};
@@ -258,31 +299,7 @@ static struct ata_port_info piix_port_info[] = {
.port_ops = &piix_sata_ops,
},
- /* ich6_sata_rm */
- {
- .sht = &piix_sht,
- .host_flags = ATA_FLAG_SATA | ATA_FLAG_SRST |
- PIIX_FLAG_COMBINED | PIIX_FLAG_CHECKINTR |
- ATA_FLAG_SLAVE_POSS | PIIX_FLAG_AHCI,
- .pio_mask = 0x1f, /* pio0-4 */
- .mwdma_mask = 0x07, /* mwdma0-2 */
- .udma_mask = 0x7f, /* udma0-6 */
- .port_ops = &piix_sata_ops,
- },
-
- /* ich7_sata */
- {
- .sht = &piix_sht,
- .host_flags = ATA_FLAG_SATA | ATA_FLAG_SRST |
- PIIX_FLAG_COMBINED | PIIX_FLAG_CHECKINTR |
- ATA_FLAG_SLAVE_POSS | PIIX_FLAG_AHCI,
- .pio_mask = 0x1f, /* pio0-4 */
- .mwdma_mask = 0x07, /* mwdma0-2 */
- .udma_mask = 0x7f, /* udma0-6 */
- .port_ops = &piix_sata_ops,
- },
-
- /* esb2_sata */
+ /* ich6_sata_ahci */
{
.sht = &piix_sht,
.host_flags = ATA_FLAG_SATA | ATA_FLAG_SRST |
@@ -603,6 +620,40 @@ static int piix_disable_ahci(struct pci_dev *pdev)
}
/**
+ * piix_check_450nx_errata - Check for problem 450NX setup
+ *
+ * Check for the present of 450NX errata #19 and errata #25. If
+ * they are found return an error code so we can turn off DMA
+ */
+
+static int __devinit piix_check_450nx_errata(struct pci_dev *ata_dev)
+{
+ struct pci_dev *pdev = NULL;
+ u16 cfg;
+ u8 rev;
+ int no_piix_dma = 0;
+
+ while((pdev = pci_get_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454NX, pdev)) != NULL)
+ {
+ /* Look for 450NX PXB. Check for problem configurations
+ A PCI quirk checks bit 6 already */
+ pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
+ pci_read_config_word(pdev, 0x41, &cfg);
+ /* Only on the original revision: IDE DMA can hang */
+ if(rev == 0x00)
+ no_piix_dma = 1;
+ /* On all revisions below 5 PXB bus lock must be disabled for IDE */
+ else if(cfg & (1<<14) && rev < 5)
+ no_piix_dma = 2;
+ }
+ if(no_piix_dma)
+ dev_printk(KERN_WARNING, &ata_dev->dev, "450NX errata present, disabling IDE DMA.\n");
+ if(no_piix_dma == 2)
+ dev_printk(KERN_WARNING, &ata_dev->dev, "A BIOS update may resolve this.\n");
+ return no_piix_dma;
+}
+
+/**
* piix_init_one - Register PIIX ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in piix_pci_tbl matching with @pdev
@@ -676,7 +727,15 @@ static int piix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
"combined mode detected (p=%u, s=%u)\n",
pata_chan, sata_chan);
}
-
+ if (piix_check_450nx_errata(pdev)) {
+ /* This writes into the master table but it does not
+ really matter for this errata as we will apply it to
+ all the PIIX devices on the board */
+ port_info[0]->mwdma_mask = 0;
+ port_info[0]->udma_mask = 0;
+ port_info[1]->mwdma_mask = 0;
+ port_info[1]->udma_mask = 0;
+ }
return ata_pci_init_one(pdev, port_info, 2);
}