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author | Tejun Heo <htejun@gmail.com> | 2006-07-26 08:59:26 +0200 |
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committer | Jeff Garzik <jeff@garzik.org> | 2006-07-29 10:01:31 +0200 |
commit | c1332875cbe0c148c7f200d4f9b36b64e34d9872 (patch) | |
tree | c4456bfe0a3892989081c1ed1faaff145b9a8837 /drivers/scsi/ahci.c | |
parent | [PATCH] ahci: separate out ahci_reset_controller() and ahci_init_controller() (diff) | |
download | linux-c1332875cbe0c148c7f200d4f9b36b64e34d9872.tar.xz linux-c1332875cbe0c148c7f200d4f9b36b64e34d9872.zip |
[PATCH] ahci: implement Power Management support
Implement power management support.
Original implementation is from Zhao, Forrest <forrest.zhao@intel.com>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Zhao, Forrest <forrest.zhao@intel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/scsi/ahci.c')
-rw-r--r-- | drivers/scsi/ahci.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c index a9e0c5f79096..909a4dc79d08 100644 --- a/drivers/scsi/ahci.c +++ b/drivers/scsi/ahci.c @@ -215,6 +215,10 @@ static void ahci_freeze(struct ata_port *ap); static void ahci_thaw(struct ata_port *ap); static void ahci_error_handler(struct ata_port *ap); static void ahci_post_internal_cmd(struct ata_queued_cmd *qc); +static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg); +static int ahci_port_resume(struct ata_port *ap); +static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg); +static int ahci_pci_device_resume(struct pci_dev *pdev); static void ahci_remove_one (struct pci_dev *pdev); static struct scsi_host_template ahci_sht = { @@ -234,6 +238,8 @@ static struct scsi_host_template ahci_sht = { .slave_configure = ata_scsi_slave_config, .slave_destroy = ata_scsi_slave_destroy, .bios_param = ata_std_bios_param, + .suspend = ata_scsi_device_suspend, + .resume = ata_scsi_device_resume, }; static const struct ata_port_operations ahci_ops = { @@ -260,6 +266,9 @@ static const struct ata_port_operations ahci_ops = { .error_handler = ahci_error_handler, .post_internal_cmd = ahci_post_internal_cmd, + .port_suspend = ahci_port_suspend, + .port_resume = ahci_port_resume, + .port_start = ahci_port_start, .port_stop = ahci_port_stop, }; @@ -361,6 +370,8 @@ static struct pci_driver ahci_pci_driver = { .name = DRV_NAME, .id_table = ahci_pci_tbl, .probe = ahci_init_one, + .suspend = ahci_pci_device_suspend, + .resume = ahci_pci_device_resume, .remove = ahci_remove_one, }; @@ -1199,6 +1210,79 @@ static void ahci_post_internal_cmd(struct ata_queued_cmd *qc) } } +static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg) +{ + struct ahci_host_priv *hpriv = ap->host_set->private_data; + struct ahci_port_priv *pp = ap->private_data; + void __iomem *mmio = ap->host_set->mmio_base; + void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no); + const char *emsg = NULL; + int rc; + + rc = ahci_deinit_port(port_mmio, hpriv->cap, &emsg); + if (rc) { + ata_port_printk(ap, KERN_ERR, "%s (%d)\n", emsg, rc); + ahci_init_port(port_mmio, hpriv->cap, + pp->cmd_slot_dma, pp->rx_fis_dma); + } + + return rc; +} + +static int ahci_port_resume(struct ata_port *ap) +{ + struct ahci_port_priv *pp = ap->private_data; + struct ahci_host_priv *hpriv = ap->host_set->private_data; + void __iomem *mmio = ap->host_set->mmio_base; + void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no); + + ahci_init_port(port_mmio, hpriv->cap, pp->cmd_slot_dma, pp->rx_fis_dma); + + return 0; +} + +static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg) +{ + struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev); + void __iomem *mmio = host_set->mmio_base; + u32 ctl; + + if (mesg.event == PM_EVENT_SUSPEND) { + /* AHCI spec rev1.1 section 8.3.3: + * Software must disable interrupts prior to requesting a + * transition of the HBA to D3 state. + */ + ctl = readl(mmio + HOST_CTL); + ctl &= ~HOST_IRQ_EN; + writel(ctl, mmio + HOST_CTL); + readl(mmio + HOST_CTL); /* flush */ + } + + return ata_pci_device_suspend(pdev, mesg); +} + +static int ahci_pci_device_resume(struct pci_dev *pdev) +{ + struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev); + struct ahci_host_priv *hpriv = host_set->private_data; + void __iomem *mmio = host_set->mmio_base; + int rc; + + ata_pci_device_do_resume(pdev); + + if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) { + rc = ahci_reset_controller(mmio, pdev); + if (rc) + return rc; + + ahci_init_controller(mmio, pdev, host_set->n_ports, hpriv->cap); + } + + ata_host_set_resume(host_set); + + return 0; +} + static int ahci_port_start(struct ata_port *ap) { struct device *dev = ap->host_set->dev; |