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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>
This commit is contained in:
Alan Cox 2010-05-05 10:25:58 +01:00 committed by Jeff Garzik
parent 978c066691
commit c4acf99bde
1 changed files with 26 additions and 4 deletions
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30
drivers/ata/pata_sil680.c
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@ -190,15 +190,37 @@ static void sil680_set_dmamode(struct ata_port *ap, struct ata_device *adev)
pci_write_config_word(pdev, ua, ultra); 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 = { static struct scsi_host_template sil680_sht = {
ATA_BMDMA_SHT(DRV_NAME), ATA_BMDMA_SHT(DRV_NAME),
}; };
static struct ata_port_operations sil680_port_ops = { static struct ata_port_operations sil680_port_ops = {
.inherits = &ata_bmdma32_port_ops, .inherits = &ata_bmdma32_port_ops,
.cable_detect = sil680_cable_detect, .sff_exec_command = sil680_sff_exec_command,
.set_piomode = sil680_set_piomode, .cable_detect = sil680_cable_detect,
.set_dmamode = sil680_set_dmamode, .set_piomode = sil680_set_piomode,
.set_dmamode = sil680_set_dmamode,
}; };
/** /**