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

[Barry Song]

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 at csr.com>
---
 drivers/pinctrl/sirf/pinctrl-sirf.c | 56 +++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/drivers/pinctrl/sirf/pinctrl-sirf.c b/drivers/pinctrl/sirf/pinctrl-sirf.c
index b4727db..0677e19 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,
 };
-- 
1.8.2.3



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