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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>
This commit is contained in:
Brian Norris 2011-11-18 11:10:10 -08:00 committed by Jeff Garzik
parent 80a9c43000
commit 17ab594fa5
2 changed files with 70 additions and 0 deletions
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68
drivers/ata/ahci_platform.c
View File

@ -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,
};

2
include/linux/ahci_platform.h
View File

@ -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;