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Date: Thu, 1 Nov 2012 19:53:06 +0400
From: Dmitry Osipenko <digetx@...il.com>
To: swarren@...dotorg.org
Cc: digetx@...il.com, linus.walleij@...aro.org,
linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] pinctrl: tegra: add suspend/resume support
Added suspend/resume pm ops. We need to store current regs vals on suspend and
restore them on resume.
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
Tested on my tablet.
drivers/pinctrl/pinctrl-tegra.c | 94 +++++++++++++++++++++++++++++++++++++++--
1 file changed, 91 insertions(+), 3 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-tegra.c b/drivers/pinctrl/pinctrl-tegra.c
index 7da0b37..03a3afb 100644
--- a/drivers/pinctrl/pinctrl-tegra.c
+++ b/drivers/pinctrl/pinctrl-tegra.c
@@ -41,6 +41,11 @@ struct tegra_pmx {
int nbanks;
void __iomem **regs;
+
+ int *bank_size;
+#ifdef CONFIG_PM_SLEEP
+ u32 *regs_store;
+#endif
};
static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
@@ -685,11 +690,72 @@ static struct pinctrl_desc tegra_pinctrl_desc = {
.owner = THIS_MODULE,
};
+#ifdef CONFIG_PM_SLEEP
+static int tegra_pinctrl_suspend_noirq(struct device *dev)
+{
+ struct tegra_pmx *pmx = dev_get_drvdata(dev);
+ int store_offset = 0;
+ int i, reg;
+ u32 val;
+
+ if (!pmx)
+ return -ENOMEM;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+
+ for (reg = 0; reg < pmx->bank_size[i]; reg += 4) {
+ val = pmx_readl(pmx, i, reg);
+ pmx->regs_store[store_offset] = val;
+ store_offset++;
+
+ dev_dbg(dev, "stored val: 0x%x bank: %d reg: 0x%x\n",
+ val, i, reg);
+ }
+ }
+
+ return 0;
+}
+
+static int tegra_pinctrl_resume_noirq(struct device *dev)
+{
+ struct tegra_pmx *pmx = dev_get_drvdata(dev);
+ int store_offset = 0;
+ int i, reg;
+ u32 val;
+
+ if (!pmx)
+ return -ENOMEM;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+
+ for (reg = 0; reg < pmx->bank_size[i]; reg += 4) {
+ val = pmx->regs_store[store_offset];
+ pmx_writel(pmx, val, i, reg);
+ store_offset++;
+
+ dev_dbg(dev, "restored val: 0x%x bank: %d reg: 0x%x\n",
+ val, i, reg);
+ }
+ }
+
+ return 0;
+}
+
+static const struct dev_pm_ops tegra_pinctrl_pm_ops = {
+ .suspend_noirq = tegra_pinctrl_suspend_noirq,
+ .resume_noirq = tegra_pinctrl_resume_noirq,
+};
+#define TEGRA_PINCTRL_PM (&tegra_pinctrl_pm_ops)
+#else
+#define TEGRA_PINCTRL_PM NULL
+#endif
+
int __devinit tegra_pinctrl_probe(struct platform_device *pdev,
const struct tegra_pinctrl_soc_data *soc_data)
{
struct tegra_pmx *pmx;
struct resource *res;
+ int nregs = 0;
int i;
pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
@@ -712,6 +778,13 @@ int __devinit tegra_pinctrl_probe(struct platform_device *pdev,
}
pmx->nbanks = i;
+ pmx->bank_size = devm_kzalloc(&pdev->dev, pmx->nbanks * sizeof(int),
+ GFP_KERNEL);
+ if (!pmx->bank_size) {
+ dev_err(&pdev->dev, "Can't alloc banks sizes pointer\n");
+ return -ENODEV;
+ }
+
pmx->regs = devm_kzalloc(&pdev->dev, pmx->nbanks * sizeof(*pmx->regs),
GFP_KERNEL);
if (!pmx->regs) {
@@ -726,22 +799,35 @@ int __devinit tegra_pinctrl_probe(struct platform_device *pdev,
return -ENODEV;
}
+ pmx->bank_size[i] = resource_size(res);
+
if (!devm_request_mem_region(&pdev->dev, res->start,
- resource_size(res),
- dev_name(&pdev->dev))) {
+ pmx->bank_size[i],
+ dev_name(&pdev->dev))) {
dev_err(&pdev->dev,
"Couldn't request MEM resource %d\n", i);
return -ENODEV;
}
pmx->regs[i] = devm_ioremap(&pdev->dev, res->start,
- resource_size(res));
+ pmx->bank_size[i]);
if (!pmx->regs[i]) {
dev_err(&pdev->dev, "Couldn't ioremap regs %d\n", i);
return -ENODEV;
}
+
+ nregs += pmx->bank_size[i] / 4;
}
+#ifdef CONFIG_PM_SLEEP
+ pmx->regs_store = devm_kzalloc(&pdev->dev, nregs * sizeof(u32),
+ GFP_KERNEL);
+ if (!pmx->regs_store) {
+ dev_err(&pdev->dev, "Can't alloc regs store pointer\n");
+ return -ENODEV;
+ }
+#endif
+
pmx->pctl = pinctrl_register(&tegra_pinctrl_desc, &pdev->dev, pmx);
if (!pmx->pctl) {
dev_err(&pdev->dev, "Couldn't register pinctrl driver\n");
@@ -752,6 +838,8 @@ int __devinit tegra_pinctrl_probe(struct platform_device *pdev,
platform_set_drvdata(pdev, pmx);
+ pdev->dev.driver->pm = TEGRA_PINCTRL_PM;
+
dev_dbg(&pdev->dev, "Probed Tegra pinctrl driver\n");
return 0;
--
1.7.12
--
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