diff options
| author | Alan Cox <alan@linux.intel.com> | 2010-05-05 10:25:58 +0100 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2010-05-14 22:34:30 -0400 |
| commit | c4acf99bdebb84b21cf2d12521f990bbfe5d5500 (patch) | |
| tree | ad086bb1e6419cd81c4d270b3457c5cdeb98912d /drivers/ata/pata_sil680.c | |
| parent | 978c066691a49a205673672a55685305663a2554 (diff) | |
| download | lwn-c4acf99bdebb84b21cf2d12521f990bbfe5d5500.tar.gz lwn-c4acf99bdebb84b21cf2d12521f990bbfe5d5500.zip | |
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/pata_sil680.c')
| -rw-r--r-- | drivers/ata/pata_sil680.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/ata/pata_sil680.c b/drivers/ata/pata_sil680.c index c6c589c23ffc..43faf106f647 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, }; /** |