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Date: Tue, 23 Apr 2013 23:39:01 +0530
From: Bibek Basu <bbasu@...dia.com>
To: <linus.walleij@...aro.org>, <swarren@...dotorg.org>
CC: <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Pritesh Raithatha <praithatha@...dia.com>,
Bibek Basu <bbasu@...dia.com>
Subject: [PATCH 1/2] pinctrl: tegra: add suspend-resume support
From: Pritesh Raithatha <praithatha@...dia.com>
This patch adds suspend and resume callbacks to the pinctrl-tegra driver.
Signed-off-by: Pritesh Raithatha <praithatha@...dia.com>
Signed-off-by: Bibek Basu <bbasu@...dia.com>
---
drivers/pinctrl/pinctrl-tegra.c | 56 ++++++++++++++++++++++++++++++++++++--
drivers/pinctrl/pinctrl-tegra.h | 3 +-
drivers/pinctrl/pinctrl-tegra114.c | 3 ++
drivers/pinctrl/pinctrl-tegra20.c | 3 ++
drivers/pinctrl/pinctrl-tegra30.c | 2 ++
5 files changed, 64 insertions(+), 3 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-tegra.c b/drivers/pinctrl/pinctrl-tegra.c
index f195d77..16ffd79 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/pm.h>
#include "core.h"
#include "pinctrl-tegra.h"
@@ -41,6 +42,8 @@ struct tegra_pmx {
int nbanks;
void __iomem **regs;
+ int *regs_size;
+ u32 *pg_data;
};
static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg)
@@ -701,12 +704,42 @@ static struct pinctrl_desc tegra_pinctrl_desc = {
.owner = THIS_MODULE,
};
+int pinctrl_suspend(struct device *dev)
+{
+ int i, j;
+ struct tegra_pmx *pmx = dev_get_drvdata(dev);
+ 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;
+}
+
+int pinctrl_resume(struct device *dev)
+{
+ int i, j;
+ struct tegra_pmx *pmx = dev_get_drvdata(dev);
+ 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++);
+ }
+ return 0;
+}
+
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;
+ struct tegra_pmx *pmx;
+ int i, pg_data_size = 0;
pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
if (!pmx) {
@@ -725,6 +758,7 @@ 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 +769,21 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
return -ENODEV;
}
+if (IS_ENABLED(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;
+ }
+
for (i = 0; i < pmx->nbanks; i++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res) {
@@ -756,6 +805,9 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
dev_err(&pdev->dev, "Couldn't ioremap regs %d\n", i);
return -ENODEV;
}
+
+if (IS_ENABLED(CONFIG_PM_SLEEP))
+ pmx->regs_size[i] = resource_size(res);
}
pmx->pctl = pinctrl_register(&tegra_pinctrl_desc, &pdev->dev, pmx);
diff --git a/drivers/pinctrl/pinctrl-tegra.h b/drivers/pinctrl/pinctrl-tegra.h
index 817f706..71616c7 100644
--- a/drivers/pinctrl/pinctrl-tegra.h
+++ b/drivers/pinctrl/pinctrl-tegra.h
@@ -202,5 +202,6 @@ struct tegra_pinctrl_soc_data {
int tegra_pinctrl_probe(struct platform_device *pdev,
const struct tegra_pinctrl_soc_data *soc_data);
int tegra_pinctrl_remove(struct platform_device *pdev);
-
+int pinctrl_suspend(struct device *dev);
+int pinctrl_resume(struct device *dev);
#endif
diff --git a/drivers/pinctrl/pinctrl-tegra114.c b/drivers/pinctrl/pinctrl-tegra114.c
index 622c485..9641588 100644
--- a/drivers/pinctrl/pinctrl-tegra114.c
+++ b/drivers/pinctrl/pinctrl-tegra114.c
@@ -2752,10 +2752,13 @@ static struct of_device_id tegra114_pinctrl_of_match[] = {
};
MODULE_DEVICE_TABLE(of, tegra114_pinctrl_of_match);
+static SIMPLE_DEV_PM_OPS(pinctrl_dev_pm_ops, pinctrl_suspend, pinctrl_resume);
+
static struct platform_driver tegra114_pinctrl_driver = {
.driver = {
.name = "tegra114-pinctrl",
.owner = THIS_MODULE,
+ .pm = &pinctrl_dev_pm_ops,
.of_match_table = tegra114_pinctrl_of_match,
},
.probe = tegra114_pinctrl_probe,
diff --git a/drivers/pinctrl/pinctrl-tegra20.c b/drivers/pinctrl/pinctrl-tegra20.c
index fcfb7d0..ea45ad5 100644
--- a/drivers/pinctrl/pinctrl-tegra20.c
+++ b/drivers/pinctrl/pinctrl-tegra20.c
@@ -2872,10 +2872,13 @@ static struct of_device_id tegra20_pinctrl_of_match[] = {
{ },
};
+static SIMPLE_DEV_PM_OPS(pinctrl_dev_pm_ops, pinctrl_suspend, pinctrl_resume);
+
static struct platform_driver tegra20_pinctrl_driver = {
.driver = {
.name = "tegra20-pinctrl",
.owner = THIS_MODULE,
+ .pm = &pinctrl_dev_pm_ops,
.of_match_table = tegra20_pinctrl_of_match,
},
.probe = tegra20_pinctrl_probe,
diff --git a/drivers/pinctrl/pinctrl-tegra30.c b/drivers/pinctrl/pinctrl-tegra30.c
index 2300deb..11899d4 100644
--- a/drivers/pinctrl/pinctrl-tegra30.c
+++ b/drivers/pinctrl/pinctrl-tegra30.c
@@ -3736,6 +3736,8 @@ static struct of_device_id tegra30_pinctrl_of_match[] = {
{ },
};
+static SIMPLE_DEV_PM_OPS(pinctrl_dev_pm_ops, pinctrl_suspend, pinctrl_resume);
+
static struct platform_driver tegra30_pinctrl_driver = {
.driver = {
.name = "tegra30-pinctrl",
--
1.8.1.5
--
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