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Date: Thu, 28 Mar 2013 22:41:25 +0530
From: Bibek Basu <bbasu@...dia.com>
To: Linus Walleij <linus.walleij@...aro.org>
CC: <linux-kernel@...r.kernel.org>,
Pritesh Raithatha <praithatha@...dia.com>,
Bibek Basu <bbasu@...dia.com>
Subject: [PATCH] pinctrl: tegra: add suspend-resume support
From: Pritesh Raithatha <praithatha@...dia.com>
This patch adds suspend and resume callbacks to the pinctrl-tegra driver.
Based on work by:
Pritesh Raithatha <praithatha@...dia.com>
Signed-off-by: Pritesh Raithatha <praithatha@...dia.com>
Signed-off-by: Bibek Basu <bbasu@...dia.com>
---
drivers/pinctrl/pinctrl-tegra.c | 71 +++++++++++++++++++++++++++++++++++++++--
1 file changed, 68 insertions(+), 3 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-tegra.c b/drivers/pinctrl/pinctrl-tegra.c
index f195d77..c789326 100644
--- a/drivers/pinctrl/pinctrl-tegra.c
+++ b/drivers/pinctrl/pinctrl-tegra.c
@@ -29,6 +29,7 @@
#include <linux/pinctrl/pinmux.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/slab.h>
+#include <linux/syscore_ops.h>
#include "core.h"
#include "pinctrl-tegra.h"
@@ -41,8 +42,13 @@ struct tegra_pmx {
int nbanks;
void __iomem **regs;
+ int *regs_size;
+
+ u32 *pg_data;
};
+static struct tegra_pmx *pmx;
+
static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
{
return readl(pmx->regs[bank] + reg);
@@ -701,12 +707,47 @@ static struct pinctrl_desc tegra_pinctrl_desc = {
.owner = THIS_MODULE,
};
+#ifdef CONFIG_PM_SLEEP
+
+static int pinctrl_suspend(void)
+{
+ int i, j;
+ u32 *pg_data = pmx->pg_data;
+ u32 *regs;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+ regs = pmx->regs[i];
+ for (j = 0; j < pmx->regs_size[i] / 4; j++)
+ *pg_data++ = readl(regs++);
+ }
+ return 0;
+}
+
+static void pinctrl_resume(void)
+{
+ int i, j;
+ u32 *pg_data = pmx->pg_data;
+ u32 *regs;
+
+ for (i = 0; i < pmx->nbanks; i++) {
+ regs = pmx->regs[i];
+ for (j = 0; j < pmx->regs_size[i] / 4; j++)
+ writel(*pg_data++, regs++);
+ }
+}
+
+static struct syscore_ops pinctrl_syscore_ops = {
+ .suspend = pinctrl_suspend,
+ .resume = pinctrl_resume,
+};
+
+#endif
+
int tegra_pinctrl_probe(struct platform_device *pdev,
const struct tegra_pinctrl_soc_data *soc_data)
-{
- struct tegra_pmx *pmx;
+ {
struct resource *res;
- int i;
+ int i, pg_data_size = 0;
pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
if (!pmx) {
@@ -725,6 +766,7 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res)
break;
+ pg_data_size += resource_size(res);
}
pmx->nbanks = i;
@@ -735,6 +777,22 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
return -ENODEV;
}
+#ifdef CONFIG_PM_SLEEP
+ pmx->regs_size = devm_kzalloc(&pdev->dev,
+ pmx->nbanks * sizeof(*(pmx->regs_size)),
+ GFP_KERNEL);
+ if (!pmx->regs_size) {
+ dev_err(&pdev->dev, "Can't alloc regs pointer\n");
+ return -ENODEV;
+ }
+
+ pmx->pg_data = devm_kzalloc(&pdev->dev, pg_data_size, GFP_KERNEL);
+ if (!pmx->pg_data) {
+ dev_err(&pdev->dev, "Can't alloc pingroup data pointer\n");
+ return -ENODEV;
+ }
+#endif
+
for (i = 0; i < pmx->nbanks; i++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res) {
@@ -756,6 +814,10 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
dev_err(&pdev->dev, "Couldn't ioremap regs %d\n", i);
return -ENODEV;
}
+
+#ifdef CONFIG_PM_SLEEP
+ pmx->regs_size[i] = resource_size(res);
+#endif
}
pmx->pctl = pinctrl_register(&tegra_pinctrl_desc, &pdev->dev, pmx);
@@ -768,6 +830,9 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
platform_set_drvdata(pdev, pmx);
+#ifdef CONFIG_PM_SLEEP
+ register_syscore_ops(&pinctrl_syscore_ops);
+#endif
dev_dbg(&pdev->dev, "Probed Tegra pinctrl driver\n");
return 0;
--
1.8.1.5
--
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