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[PATCH] ahci: add support for VIA VT8251 

Adds AHCI support for the VIA VT8251.

Includes a workaround for a hardware bug which requires a Command List
Override before softreset.

Signed-off-by: Bastiaan Jacques <b.jacques@planet.nl>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Bastiaan Jacques 2006-04-17 14:17:59 +02:00 committed by Jeff Garzik
parent 857c68f733
commit bf2af2a202
1 changed files with 49 additions and 15 deletions
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64
drivers/scsi/ahci.c
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@ -73,6 +73,7 @@ enum {
RX_FIS_D2H_REG = 0x40, /* offset of D2H Register FIS data */
board_ahci = 0,
board_ahci_vt8251 = 1,
/* global controller registers */
HOST_CAP = 0x00, /* host capabilities */
@ -153,6 +154,9 @@ enum {
/* hpriv->flags bits */
AHCI_FLAG_MSI = (1 << 0),
/* ap->flags bits */
AHCI_FLAG_RESET_NEEDS_CLO = (1 << 24),
};
struct ahci_cmd_hdr {
@ -255,6 +259,16 @@ static const struct ata_port_info ahci_port_info[] = {
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
.port_ops = &ahci_ops,
},
/* board_ahci_vt8251 */
{
.sht = &ahci_sht,
.host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
AHCI_FLAG_RESET_NEEDS_CLO,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
.port_ops = &ahci_ops,
},
};
static const struct pci_device_id ahci_pci_tbl[] = {
@ -296,6 +310,8 @@ static const struct pci_device_id ahci_pci_tbl[] = {
board_ahci }, /* ATI SB600 non-raid */
{ PCI_VENDOR_ID_ATI, 0x4381, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
board_ahci }, /* ATI SB600 raid */
{ PCI_VENDOR_ID_VIA, 0x3349, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
board_ahci_vt8251 }, /* VIA VT8251 */
{ } /* terminate list */
};
@ -516,9 +532,29 @@ static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, u32 opts)
pp->cmd_slot[0].tbl_addr_hi = cpu_to_le32((pp->cmd_tbl_dma >> 16) >> 16);
}
static int ahci_clo(struct ata_port *ap)
{
void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
struct ahci_host_priv *hpriv = ap->host_set->private_data;
u32 tmp;
if (!(hpriv->cap & HOST_CAP_CLO))
return -EOPNOTSUPP;
tmp = readl(port_mmio + PORT_CMD);
tmp |= PORT_CMD_CLO;
writel(tmp, port_mmio + PORT_CMD);
tmp = ata_wait_register(port_mmio + PORT_CMD,
PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
if (tmp & PORT_CMD_CLO)
return -EIO;
return 0;
}
static int ahci_softreset(struct ata_port *ap, unsigned int *class)
{
struct ahci_host_priv *hpriv = ap->host_set->private_data;
struct ahci_port_priv *pp = ap->private_data;
void __iomem *mmio = ap->host_set->mmio_base;
void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
@ -547,21 +583,13 @@ static int ahci_softreset(struct ata_port *ap, unsigned int *class)
/* check BUSY/DRQ, perform Command List Override if necessary */
ahci_tf_read(ap, &tf);
if (tf.command & (ATA_BUSY | ATA_DRQ)) {
if (!(hpriv->cap & HOST_CAP_CLO)) {
rc = -EIO;
reason = "port busy but no CLO";
rc = ahci_clo(ap);
if (rc == -EOPNOTSUPP) {
reason = "port busy but CLO unavailable";
goto fail_restart;
}
tmp = readl(port_mmio + PORT_CMD);
tmp |= PORT_CMD_CLO;
writel(tmp, port_mmio + PORT_CMD);
tmp = ata_wait_register(port_mmio + PORT_CMD,
PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
if (tmp & PORT_CMD_CLO) {
rc = -EIO;
reason = "CLO failed";
} else if (rc) {
reason = "port busy but CLO failed";
goto fail_restart;
}
}
@ -672,6 +700,12 @@ static void ahci_postreset(struct ata_port *ap, unsigned int *class)
static int ahci_probe_reset(struct ata_port *ap, unsigned int *classes)
{
if ((ap->flags & AHCI_FLAG_RESET_NEEDS_CLO) &&
(ata_busy_wait(ap, ATA_BUSY, 1000) & ATA_BUSY)) {
/* ATA_BUSY hasn't cleared, so send a CLO */
ahci_clo(ap);
}
return ata_drive_probe_reset(ap, ata_std_probeinit,
ahci_softreset, ahci_hardreset,
ahci_postreset, classes);