[PATCH v7 06/15] ahci-platform: "Library-ise" suspend / resume functionality

[hdegoede@redhat.com (Hans de Goede)]

Split suspend / resume code into host suspend / resume functionality and
resource enable / disabling phases, and export the new suspend_ / resume_host
functions.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/ata/ahci_platform.c   | 109 ++++++++++++++++++++++++++++++++++++------
 include/linux/ahci_platform.h |   5 ++
 2 files changed, 99 insertions(+), 15 deletions(-)

diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 7f3f2ac..bdadec1 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -452,14 +452,26 @@ static void ahci_host_stop(struct ata_host *host)
 }
 
 #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.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	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");
@@ -476,7 +488,64 @@ static int ahci_suspend(struct device *dev)
 	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.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	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.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	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;
 
@@ -487,8 +556,22 @@ static int ahci_suspend(struct device *dev)
 
 	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.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	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);
@@ -505,15 +588,9 @@ static int ahci_resume(struct device *dev)
 			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;
 
@@ -522,9 +599,11 @@ 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", },
diff --git a/include/linux/ahci_platform.h b/include/linux/ahci_platform.h
index b80c51c..542f268 100644
--- a/include/linux/ahci_platform.h
+++ b/include/linux/ahci_platform.h
@@ -50,4 +50,9 @@ int ahci_platform_init_host(struct platform_device *pdev,
 			    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 */
-- 
1.9.0