Commit c4acf99b authored by Alan Cox's avatar Alan Cox Committed by Jeff Garzik
Browse files

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: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 978c0666

drivers/ata/pata_sil680.c

+26 −4
Original line number Diff line number Diff line
@@ -190,12 +190,34 @@ 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,

	.sff_exec_command	= sil680_sff_exec_command,

	.cable_detect		= sil680_cable_detect,

	.set_piomode		= sil680_set_piomode,

	.set_dmamode		= sil680_set_dmamode,