diff options
| -rw-r--r-- | drivers/ata/ahci_platform.c | 68 | ||||
| -rw-r--r-- | include/linux/ahci_platform.h | 2 |
2 files changed, 70 insertions, 0 deletions
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c index 43b875810d1..48be4e18916 100644 --- a/drivers/ata/ahci_platform.c +++ b/drivers/ata/ahci_platform.c @@ -202,6 +202,71 @@ static int __devexit ahci_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM +static int ahci_suspend(struct device *dev) +{ + struct ahci_platform_data *pdata = dev_get_platdata(dev); + struct ata_host *host = dev_get_drvdata(dev); + struct ahci_host_priv *hpriv = host->private_data; + void __iomem *mmio = hpriv->mmio; + u32 ctl; + int rc; + + if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) { + dev_err(dev, "firmware update required for suspend/resume\n"); + return -EIO; + } + + /* + * 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 */ + + rc = ata_host_suspend(host, PMSG_SUSPEND); + if (rc) + return rc; + + if (pdata && pdata->suspend) + return pdata->suspend(dev); + return 0; +} + +static int ahci_resume(struct device *dev) +{ + struct ahci_platform_data *pdata = dev_get_platdata(dev); + struct ata_host *host = dev_get_drvdata(dev); + int rc; + + if (pdata && pdata->resume) { + rc = pdata->resume(dev); + if (rc) + return rc; + } + + if (dev->power.power_state.event == PM_EVENT_SUSPEND) { + rc = ahci_reset_controller(host); + if (rc) + return rc; + + ahci_init_controller(host); + } + + ata_host_resume(host); + + return 0; +} + +static struct dev_pm_ops ahci_pm_ops = { + .suspend = &ahci_suspend, + .resume = &ahci_resume, +}; +#endif + static const struct of_device_id ahci_of_match[] = { { .compatible = "calxeda,hb-ahci", }, {}, @@ -214,6 +279,9 @@ static struct platform_driver ahci_driver = { .name = "ahci", .owner = THIS_MODULE, .of_match_table = ahci_of_match, +#ifdef CONFIG_PM + .pm = &ahci_pm_ops, +#endif }, .id_table = ahci_devtype, }; diff --git a/include/linux/ahci_platform.h b/include/linux/ahci_platform.h index be3d9a77d6e..73a25005d88 100644 --- a/include/linux/ahci_platform.h +++ b/include/linux/ahci_platform.h @@ -23,6 +23,8 @@ struct ata_port_info; struct ahci_platform_data { int (*init)(struct device *dev, void __iomem *addr); void (*exit)(struct device *dev); + int (*suspend)(struct device *dev); + int (*resume)(struct device *dev); const struct ata_port_info *ata_port_info; unsigned int force_port_map; unsigned int mask_port_map; |