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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2015-03-19 11:30:47 +0100
committerLinus Walleij <linus.walleij@linaro.org>2015-03-27 09:35:08 +0100
commit12149a20b86330d6eac71edaad0357541abdcd05 (patch)
tree2e0d48e7233045c309cbbb7d11670516dc3c319e /drivers/pinctrl/mvebu
parentpinctrl: st: Display pin's function when printing pinctrl debug information (diff)
downloadlinux-12149a20b86330d6eac71edaad0357541abdcd05.tar.xz
linux-12149a20b86330d6eac71edaad0357541abdcd05.zip
pinctrl: mvebu: add suspend/resume support to Armada XP pinctrl driver
This commit adds suspend/resume support to the Armada XP pinctrl driver, by simply saving and restoring the MPP registers. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/mvebu')
-rw-r--r--drivers/pinctrl/mvebu/pinctrl-armada-xp.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-xp.c b/drivers/pinctrl/mvebu/pinctrl-armada-xp.c
index fc3376147c18..d191c3a24885 100644
--- a/drivers/pinctrl/mvebu/pinctrl-armada-xp.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-xp.c
@@ -34,6 +34,7 @@
#include "pinctrl-mvebu.h"
static void __iomem *mpp_base;
+static u32 *mpp_saved_regs;
static int armada_xp_mpp_ctrl_get(unsigned pid, unsigned long *config)
{
@@ -406,12 +407,42 @@ static struct pinctrl_gpio_range mv78460_mpp_gpio_ranges[] = {
MPP_GPIO_RANGE(2, 64, 64, 3),
};
+static int armada_xp_pinctrl_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct mvebu_pinctrl_soc_info *soc =
+ platform_get_drvdata(pdev);
+ int i, nregs;
+
+ nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
+
+ for (i = 0; i < nregs; i++)
+ mpp_saved_regs[i] = readl(mpp_base + i * 4);
+
+ return 0;
+}
+
+static int armada_xp_pinctrl_resume(struct platform_device *pdev)
+{
+ struct mvebu_pinctrl_soc_info *soc =
+ platform_get_drvdata(pdev);
+ int i, nregs;
+
+ nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
+
+ for (i = 0; i < nregs; i++)
+ writel(mpp_saved_regs[i], mpp_base + i * 4);
+
+ return 0;
+}
+
static int armada_xp_pinctrl_probe(struct platform_device *pdev)
{
struct mvebu_pinctrl_soc_info *soc = &armada_xp_pinctrl_info;
const struct of_device_id *match =
of_match_device(armada_xp_pinctrl_of_match, &pdev->dev);
struct resource *res;
+ int nregs;
if (!match)
return -ENODEV;
@@ -459,6 +490,13 @@ static int armada_xp_pinctrl_probe(struct platform_device *pdev)
break;
}
+ nregs = DIV_ROUND_UP(soc->nmodes, MVEBU_MPPS_PER_REG);
+
+ mpp_saved_regs = devm_kmalloc(&pdev->dev, nregs * sizeof(u32),
+ GFP_KERNEL);
+ if (!mpp_saved_regs)
+ return -ENOMEM;
+
pdev->dev.platform_data = soc;
return mvebu_pinctrl_probe(pdev);
@@ -476,6 +514,8 @@ static struct platform_driver armada_xp_pinctrl_driver = {
},
.probe = armada_xp_pinctrl_probe,
.remove = armada_xp_pinctrl_remove,
+ .suspend = armada_xp_pinctrl_suspend,
+ .resume = armada_xp_pinctrl_resume,
};
module_platform_driver(armada_xp_pinctrl_driver);