ahci: platform support for suspend/resume
Add platform hooks for custom suspend() and resume() functions. The generic suspend/resume code in drivers/ata/ahci_platform.c is adapted from the PCI version in drivers/ata/ahci.c. Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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@ -202,6 +202,71 @@ static int __devexit ahci_remove(struct platform_device *pdev)
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return 0;
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}
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#ifdef CONFIG_PM
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static int ahci_suspend(struct device *dev)
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{
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struct ahci_platform_data *pdata = dev_get_platdata(dev);
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struct ata_host *host = dev_get_drvdata(dev);
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struct ahci_host_priv *hpriv = host->private_data;
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void __iomem *mmio = hpriv->mmio;
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u32 ctl;
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int rc;
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if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
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dev_err(dev, "firmware update required for suspend/resume\n");
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return -EIO;
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}
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/*
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* AHCI spec rev1.1 section 8.3.3:
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* Software must disable interrupts prior to requesting a
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* transition of the HBA to D3 state.
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*/
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ctl = readl(mmio + HOST_CTL);
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ctl &= ~HOST_IRQ_EN;
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writel(ctl, mmio + HOST_CTL);
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readl(mmio + HOST_CTL); /* flush */
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rc = ata_host_suspend(host, PMSG_SUSPEND);
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if (rc)
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return rc;
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if (pdata && pdata->suspend)
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return pdata->suspend(dev);
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return 0;
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}
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static int ahci_resume(struct device *dev)
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{
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struct ahci_platform_data *pdata = dev_get_platdata(dev);
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struct ata_host *host = dev_get_drvdata(dev);
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int rc;
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if (pdata && pdata->resume) {
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rc = pdata->resume(dev);
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if (rc)
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return rc;
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}
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if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
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rc = ahci_reset_controller(host);
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if (rc)
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return rc;
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ahci_init_controller(host);
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}
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ata_host_resume(host);
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return 0;
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}
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static struct dev_pm_ops ahci_pm_ops = {
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.suspend = &ahci_suspend,
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.resume = &ahci_resume,
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};
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#endif
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static const struct of_device_id ahci_of_match[] = {
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{ .compatible = "calxeda,hb-ahci", },
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{},
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@ -214,6 +279,9 @@ static struct platform_driver ahci_driver = {
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.name = "ahci",
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.owner = THIS_MODULE,
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.of_match_table = ahci_of_match,
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#ifdef CONFIG_PM
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.pm = &ahci_pm_ops,
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#endif
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},
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.id_table = ahci_devtype,
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};
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@ -23,6 +23,8 @@ struct ata_port_info;
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struct ahci_platform_data {
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int (*init)(struct device *dev, void __iomem *addr);
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void (*exit)(struct device *dev);
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int (*suspend)(struct device *dev);
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int (*resume)(struct device *dev);
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const struct ata_port_info *ata_port_info;
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unsigned int force_port_map;
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unsigned int mask_port_map;
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