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authorAlan Cox <alan@linux.intel.com>2010-05-05 10:25:58 +0100
committerJeff Garzik <jgarzik@redhat.com>2010-05-14 22:34:30 -0400
commitc4acf99bdebb84b21cf2d12521f990bbfe5d5500 (patch)
treead086bb1e6419cd81c4d270b3457c5cdeb98912d /drivers/ata
parent978c066691a49a205673672a55685305663a2554 (diff)
downloadlinux-2.6.34-ux500-c4acf99bdebb84b21cf2d12521f990bbfe5d5500.tar.gz
pata_sil680: Do our own exec_command posting
Use our own mmio area to avoid PCI posting. This avoids the rather slow paranoid implementation in the default handler. Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/pata_sil680.c30
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c
index c6c589c23ff..43faf106f64 100644
--- a/drivers/ata/pata_sil680.c
+++ b/drivers/ata/pata_sil680.c
@@ -190,15 +190,37 @@ static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
pci_write_config_word(pdev, ua, ultra);
}
+/**
+ * sil680_sff_exec_command - issue ATA command to host controller
+ * @ap: port to which command is being issued
+ * @tf: ATA taskfile register set
+ *
+ * Issues ATA command, with proper synchronization with interrupt
+ * handler / other threads. Use our MMIO space for PCI posting to avoid
+ * a hideously slow cycle all the way to the device.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+void sil680_sff_exec_command(struct ata_port *ap,
+ const struct ata_taskfile *tf)
+{
+ DPRINTK("ata%u: cmd 0x%X\n", ap->print_id, tf->command);
+ iowrite8(tf->command, ap->ioaddr.command_addr);
+ ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+}
+
static struct scsi_host_template sil680_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
+
static struct ata_port_operations sil680_port_ops = {
- .inherits = &ata_bmdma32_port_ops,
- .cable_detect = sil680_cable_detect,
- .set_piomode = sil680_set_piomode,
- .set_dmamode = sil680_set_dmamode,
+ .inherits = &ata_bmdma32_port_ops,
+ .sff_exec_command = sil680_sff_exec_command,
+ .cable_detect = sil680_cable_detect,
+ .set_piomode = sil680_set_piomode,
+ .set_dmamode = sil680_set_dmamode,
};
/**