From 37024e8ee0d8dbcd0c2634192cb3836549db054e Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 11 Apr 2006 22:32:19 +0900 Subject: [PATCH] [PATCH] sata_sil24: implement loss of completion interrupt on PCI-X errta fix 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 Signed-off-by: Jeff Garzik --- drivers/scsi/sata_sil24.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c index 50c2c6bcba6e..c535607e995a 100644 --- a/drivers/scsi/sata_sil24.c +++ b/drivers/scsi/sata_sil24.c @@ -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);