[PATCH] mmc: sdhci-omap: Add Support for Suspend/Resume

[Faiz Abbas <faiz_abbas@ti.com>]

Add power management ops which save and restore the driver context and
facilitate a system suspend and resume.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
---
 drivers/mmc/host/sdhci-omap.c | 59 +++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index 882053151a47..a524c01da8de 100644
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -108,6 +108,11 @@ struct sdhci_omap_host {
 	struct pinctrl		*pinctrl;
 	struct pinctrl_state	**pinctrl_state;
 	bool			is_tuning;
+	/* Omap specific context save */
+	u32			con;
+	u32			hctl;
+	u32			sysctl;
+	u32			capa;
 };
 
 static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
@@ -1233,11 +1238,65 @@ static int sdhci_omap_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void sdhci_omap_context_save(struct sdhci_omap_host *omap_host)
+{
+	omap_host->con = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
+	omap_host->hctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
+	omap_host->sysctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
+	omap_host->capa = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
+}
+
+static void sdhci_omap_context_restore(struct sdhci_omap_host *omap_host)
+{
+	sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, omap_host->con);
+	sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, omap_host->hctl);
+	sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, omap_host->sysctl);
+	sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, omap_host->capa);
+}
+
+static int __maybe_unused sdhci_omap_suspend(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
+
+	sdhci_suspend_host(host);
+
+	sdhci_omap_context_save(omap_host);
+
+	pinctrl_pm_select_idle_state(dev);
+
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+static int __maybe_unused sdhci_omap_resume(struct device *dev)
+{
+	struct sdhci_host *host = dev_get_drvdata(dev);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
+
+	pm_runtime_get_sync(dev);
+
+	pinctrl_pm_select_default_state(dev);
+
+	sdhci_omap_context_restore(omap_host);
+
+	sdhci_resume_host(host);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(sdhci_omap_dev_pm_ops, sdhci_omap_suspend,
+			 sdhci_omap_resume);
+
 static struct platform_driver sdhci_omap_driver = {
 	.probe = sdhci_omap_probe,
 	.remove = sdhci_omap_remove,
 	.driver = {
 		   .name = "sdhci-omap",
+		   .pm = &sdhci_omap_dev_pm_ops,
 		   .of_match_table = omap_sdhci_match,
 		  },
 };
-- 
2.19.2