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