You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
173 lines
5.0 KiB
173 lines
5.0 KiB
From 8121ed9c7ea2d56f5e0a98c2db396214f85d7485 Mon Sep 17 00:00:00 2001
|
|
From: Hans de Goede <hdegoede@redhat.com>
|
|
Date: Sat, 22 Feb 2014 16:53:35 +0100
|
|
Subject: [PATCH 115/182] ahci-platform: "Library-ise" suspend / resume
|
|
functionality
|
|
|
|
Split suspend / resume code into host suspend / resume functionality and
|
|
resource enable / disabling phases, and export the new suspend_ / resume_host
|
|
functions.
|
|
|
|
tj: Minor comment formatting updates.
|
|
|
|
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
|
|
Signed-off-by: Tejun Heo <tj@kernel.org>
|
|
---
|
|
drivers/ata/ahci_platform.c | 97 ++++++++++++++++++++++++++++++++++-------
|
|
include/linux/ahci_platform.h | 5 +++
|
|
2 files changed, 87 insertions(+), 15 deletions(-)
|
|
|
|
--- a/drivers/ata/ahci_platform.c
|
|
+++ b/drivers/ata/ahci_platform.c
|
|
@@ -432,14 +432,23 @@ static void ahci_host_stop(struct ata_ho
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
-static int ahci_suspend(struct device *dev)
|
|
+/**
|
|
+ * ahci_platform_suspend_host - Suspend an ahci-platform host
|
|
+ * @dev: device pointer for the host
|
|
+ *
|
|
+ * This function does all the usual steps needed to suspend an
|
|
+ * ahci-platform host, note any necessary resources (ie clks, phy, etc.)
|
|
+ * must be disabled after calling this.
|
|
+ *
|
|
+ * RETURNS:
|
|
+ * 0 on success otherwise a negative error code
|
|
+ */
|
|
+int ahci_platform_suspend_host(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");
|
|
@@ -456,7 +465,58 @@ static int ahci_suspend(struct device *d
|
|
writel(ctl, mmio + HOST_CTL);
|
|
readl(mmio + HOST_CTL); /* flush */
|
|
|
|
- rc = ata_host_suspend(host, PMSG_SUSPEND);
|
|
+ return ata_host_suspend(host, PMSG_SUSPEND);
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(ahci_platform_suspend_host);
|
|
+
|
|
+/**
|
|
+ * ahci_platform_resume_host - Resume an ahci-platform host
|
|
+ * @dev: device pointer for the host
|
|
+ *
|
|
+ * This function does all the usual steps needed to resume an ahci-platform
|
|
+ * host, note any necessary resources (ie clks, phy, etc.) must be
|
|
+ * initialized / enabled before calling this.
|
|
+ *
|
|
+ * RETURNS:
|
|
+ * 0 on success otherwise a negative error code
|
|
+ */
|
|
+int ahci_platform_resume_host(struct device *dev)
|
|
+{
|
|
+ struct ata_host *host = dev_get_drvdata(dev);
|
|
+ int 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;
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(ahci_platform_resume_host);
|
|
+
|
|
+/**
|
|
+ * ahci_platform_suspend - Suspend an ahci-platform device
|
|
+ * @dev: the platform device to suspend
|
|
+ *
|
|
+ * This function suspends the host associated with the device, followed by
|
|
+ * disabling all the resources of the device.
|
|
+ *
|
|
+ * RETURNS:
|
|
+ * 0 on success otherwise a negative error code
|
|
+ */
|
|
+int ahci_platform_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;
|
|
+ int rc;
|
|
+
|
|
+ rc = ahci_platform_suspend_host(dev);
|
|
if (rc)
|
|
return rc;
|
|
|
|
@@ -467,8 +527,19 @@ static int ahci_suspend(struct device *d
|
|
|
|
return 0;
|
|
}
|
|
+EXPORT_SYMBOL_GPL(ahci_platform_suspend);
|
|
|
|
-static int ahci_resume(struct device *dev)
|
|
+/**
|
|
+ * ahci_platform_resume - Resume an ahci-platform device
|
|
+ * @dev: the platform device to resume
|
|
+ *
|
|
+ * This function enables all the resources of the device followed by
|
|
+ * resuming the host associated with the device.
|
|
+ *
|
|
+ * RETURNS:
|
|
+ * 0 on success otherwise a negative error code
|
|
+ */
|
|
+int ahci_platform_resume(struct device *dev)
|
|
{
|
|
struct ahci_platform_data *pdata = dev_get_platdata(dev);
|
|
struct ata_host *host = dev_get_drvdata(dev);
|
|
@@ -485,15 +556,9 @@ static int ahci_resume(struct device *de
|
|
goto disable_resources;
|
|
}
|
|
|
|
- if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
|
|
- rc = ahci_reset_controller(host);
|
|
- if (rc)
|
|
- goto disable_resources;
|
|
-
|
|
- ahci_init_controller(host);
|
|
- }
|
|
-
|
|
- ata_host_resume(host);
|
|
+ rc = ahci_platform_resume_host(dev);
|
|
+ if (rc)
|
|
+ goto disable_resources;
|
|
|
|
return 0;
|
|
|
|
@@ -502,9 +567,11 @@ disable_resources:
|
|
|
|
return rc;
|
|
}
|
|
+EXPORT_SYMBOL_GPL(ahci_platform_resume);
|
|
#endif
|
|
|
|
-static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);
|
|
+static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
|
|
+ ahci_platform_resume);
|
|
|
|
static const struct of_device_id ahci_of_match[] = {
|
|
{ .compatible = "snps,spear-ahci", },
|
|
--- a/include/linux/ahci_platform.h
|
|
+++ b/include/linux/ahci_platform.h
|
|
@@ -50,4 +50,9 @@ int ahci_platform_init_host(struct platf
|
|
unsigned int force_port_map,
|
|
unsigned int mask_port_map);
|
|
|
|
+int ahci_platform_suspend_host(struct device *dev);
|
|
+int ahci_platform_resume_host(struct device *dev);
|
|
+int ahci_platform_suspend(struct device *dev);
|
|
+int ahci_platform_resume(struct device *dev);
|
|
+
|
|
#endif /* _AHCI_PLATFORM_H */
|
|
|