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[PATCH] sata_sil24: implement loss of completion interrupt on PCI-X errta fix

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SiI3124 might lose completion interrupt if completion interrupt occurs
shortly after SLOT_STAT register is read for the previous completion
interrupt if it is operating in PCI-X mode.

This currently doesn't trigger as libata never queues more than one
command, but it will with NCQ changes.  This patch implements the
workaround - turning on WoC and explicitly clearing interrupt.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2006-04-11 22:32:19 +09:00 committed by Jeff Garzik
parent 9466d85bb2
commit 37024e8ee0
1 changed files with 25 additions and 2 deletions
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27
drivers/scsi/sata_sil24.c
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@ -221,6 +221,7 @@ enum {
/* host flags */
SIL24_COMMON_FLAGS = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA,
SIL24_FLAG_PCIX_IRQ_WOC = (1 << 24), /* IRQ loss errata on PCI-X */
IRQ_STAT_4PORTS = 0xf,
};
@ -348,7 +349,8 @@ static struct ata_port_info sil24_port_info[] = {
/* sil_3124 */
{
.sht = &sil24_sht,
.host_flags = SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(4),
.host_flags = SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(4) |
SIL24_FLAG_PCIX_IRQ_WOC,
.pio_mask = 0x1f, /* pio0-4 */
.mwdma_mask = 0x07, /* mwdma0-2 */
.udma_mask = 0x3f, /* udma0-5 */
@ -737,6 +739,10 @@ static inline void sil24_host_intr(struct ata_port *ap)
slot_stat = readl(port + PORT_SLOT_STAT);
if (!(slot_stat & HOST_SSTAT_ATTN)) {
struct sil24_port_priv *pp = ap->private_data;
if (ap->flags & SIL24_FLAG_PCIX_IRQ_WOC)
writel(PORT_IRQ_COMPLETE, port + PORT_IRQ_STAT);
/*
* !HOST_SSAT_ATTN guarantees successful completion,
* so reading back tf registers is unnecessary for
@ -868,6 +874,7 @@ static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
void __iomem *host_base = NULL;
void __iomem *port_base = NULL;
int i, rc;
u32 tmp;
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
@ -941,13 +948,23 @@ static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
/* GPIO off */
writel(0, host_base + HOST_FLASH_CMD);
/* Apply workaround for completion IRQ loss on PCI-X errata */
if (probe_ent->host_flags & SIL24_FLAG_PCIX_IRQ_WOC) {
tmp = readl(host_base + HOST_CTRL);
if (tmp & (HOST_CTRL_TRDY | HOST_CTRL_STOP | HOST_CTRL_DEVSEL))
dev_printk(KERN_INFO, &pdev->dev,
"Applying completion IRQ loss on PCI-X "
"errata fix\n");
else
probe_ent->host_flags &= ~SIL24_FLAG_PCIX_IRQ_WOC;
}
/* clear global reset & mask interrupts during initialization */
writel(0, host_base + HOST_CTRL);
for (i = 0; i < probe_ent->n_ports; i++) {
void __iomem *port = port_base + i * PORT_REGS_SIZE;
unsigned long portu = (unsigned long)port;
u32 tmp;
probe_ent->port[i].cmd_addr = portu + PORT_PRB;
probe_ent->port[i].scr_addr = portu + PORT_SCONTROL;
@ -969,6 +986,12 @@ static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
"failed to clear port RST\n");
}
/* Configure IRQ WoC */
if (probe_ent->host_flags & SIL24_FLAG_PCIX_IRQ_WOC)
writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_STAT);
else
writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_CLR);
/* Zero error counters. */
writel(0x8000, port + PORT_DECODE_ERR_THRESH);
writel(0x8000, port + PORT_CRC_ERR_THRESH);