pinctrl: mvebu: add suspend/resume support to Armada XP pinctrl driver

This commit adds suspend/resume support to the Armada XP pinctrl
driver, by simply saving and restoring the MPP registers.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-xp.c b/drivers/pinctrl/mvebu/pinctrl-armada-xp.c
index fc3376147c18..d191c3a24885 100644
--- a/drivers/pinctrl/mvebu/pinctrl-armada-xp.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-xp.c
@@ -34,6 +34,7 @@
 #include "pinctrl-mvebu.h"
 
 static void __iomem *mpp_base;
+static u32 *mpp_saved_regs;
 
 static int armada_xp_mpp_ctrl_get(unsigned pid, unsigned long *config)
 {
@@ -406,12 +407,42 @@ static struct pinctrl_gpio_range mv78460_mpp_gpio_ranges[] = {
         MPP_GPIO_RANGE(2,  64, 64,  3),
 };
 
+static int armada_xp_pinctrl_suspend(struct platform_device *pdev,
+                                     pm_message_t state)
+{
+        struct mvebu_pinctrl_soc_info *soc =
+                platform_get_drvdata(pdev);
+        int i, nregs;
+
+        nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
+
+        for (i = 0; i < nregs; i++)
+                mpp_saved_regs[i] = readl(mpp_base + i * 4);
+
+        return 0;
+}
+
+static int armada_xp_pinctrl_resume(struct platform_device *pdev)
+{
+        struct mvebu_pinctrl_soc_info *soc =
+                platform_get_drvdata(pdev);
+        int i, nregs;
+
+        nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
+
+        for (i = 0; i < nregs; i++)
+                writel(mpp_saved_regs[i], mpp_base + i * 4);
+
+        return 0;
+}
+
 static int armada_xp_pinctrl_probe(struct platform_device *pdev)
 {
         struct mvebu_pinctrl_soc_info *soc = &armada_xp_pinctrl_info;
         const struct of_device_id *match =
                 of_match_device(armada_xp_pinctrl_of_match, &pdev->dev);
         struct resource *res;
+        int nregs;
 
         if (!match)
                 return -ENODEV;
@@ -459,6 +490,13 @@ static int armada_xp_pinctrl_probe(struct platform_device *pdev)
                 break;
         }
 
+        nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
+
+        mpp_saved_regs = devm_kmalloc(&pdev->dev, nregs * sizeof(u32),
+                                      GFP_KERNEL);
+        if (!mpp_saved_regs)
+                return -ENOMEM;
+
         pdev->dev.platform_data = soc;
 
         return mvebu_pinctrl_probe(pdev);
@@ -476,6 +514,8 @@ static struct platform_driver armada_xp_pinctrl_driver = {
         },
         .probe = armada_xp_pinctrl_probe,
         .remove = armada_xp_pinctrl_remove,
+        .suspend = armada_xp_pinctrl_suspend,
+        .resume = armada_xp_pinctrl_resume,
 };
 
 module_platform_driver(armada_xp_pinctrl_driver);