pinctrl: sirf: save the status in suspend and restore after resuming

this patch saves the status of pinctrl registers and restore them while
resuming. this makes all drivers have coherent status for pinmux after
suspending and resuming.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/pinctrl/sirf/pinctrl-sirf.c b/drivers/pinctrl/sirf/pinctrl-sirf.c
index b4727db65504..0677e198db60 100644
--- a/drivers/pinctrl/sirf/pinctrl-sirf.c
+++ b/drivers/pinctrl/sirf/pinctrl-sirf.c
@@ -390,11 +390,67 @@ out_no_rsc_remap:
         return ret;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int sirfsoc_pinmux_suspend_noirq(struct device *dev)
+{
+        int i, j;
+        struct sirfsoc_pmx *spmx = dev_get_drvdata(dev);
+
+        for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
+                for (j = 0; j < SIRFSOC_GPIO_BANK_SIZE; j++) {
+                        spmx->gpio_regs[i][j] = readl(spmx->gpio_virtbase +
+                                SIRFSOC_GPIO_CTRL(i, j));
+                }
+                spmx->ints_regs[i] = readl(spmx->gpio_virtbase +
+                        SIRFSOC_GPIO_INT_STATUS(i));
+                spmx->paden_regs[i] = readl(spmx->gpio_virtbase +
+                        SIRFSOC_GPIO_PAD_EN(i));
+        }
+        spmx->dspen_regs = readl(spmx->gpio_virtbase + SIRFSOC_GPIO_DSP_EN0);
+
+        for (i = 0; i < 3; i++)
+                spmx->rsc_regs[i] = readl(spmx->rsc_virtbase + 4 * i);
+
+        return 0;
+}
+
+static int sirfsoc_pinmux_resume_noirq(struct device *dev)
+{
+        int i, j;
+        struct sirfsoc_pmx *spmx = dev_get_drvdata(dev);
+
+        for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
+                for (j = 0; j < SIRFSOC_GPIO_BANK_SIZE; j++) {
+                        writel(spmx->gpio_regs[i][j], spmx->gpio_virtbase +
+                                SIRFSOC_GPIO_CTRL(i, j));
+                }
+                writel(spmx->ints_regs[i], spmx->gpio_virtbase +
+                        SIRFSOC_GPIO_INT_STATUS(i));
+                writel(spmx->paden_regs[i], spmx->gpio_virtbase +
+                        SIRFSOC_GPIO_PAD_EN(i));
+        }
+        writel(spmx->dspen_regs, spmx->gpio_virtbase + SIRFSOC_GPIO_DSP_EN0);
+
+        for (i = 0; i < 3; i++)
+                writel(spmx->rsc_regs[i], spmx->rsc_virtbase + 4 * i);
+
+        return 0;
+}
+
+static const struct dev_pm_ops sirfsoc_pinmux_pm_ops = {
+        .suspend_noirq = sirfsoc_pinmux_suspend_noirq,
+        .resume_noirq = sirfsoc_pinmux_resume_noirq,
+};
+#endif
+
 static struct platform_driver sirfsoc_pinmux_driver = {
         .driver = {
                 .name = DRIVER_NAME,
                 .owner = THIS_MODULE,
                 .of_match_table = pinmux_ids,
+#ifdef CONFIG_PM_SLEEP
+                .pm = &sirfsoc_pinmux_pm_ops,
+#endif
         },
         .probe = sirfsoc_pinmux_probe,
 };