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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>
This commit is contained in:
Thomas Petazzoni 2015-03-19 11:30:47 +01:00 committed by Linus Walleij
parent a8381faca5
commit 12149a20b8
1 changed files with 40 additions and 0 deletions
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40
drivers/pinctrl/mvebu/pinctrl-armada-xp.c
View File

@ -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);