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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2014-10-24 15:59:19 +0400
committerLinus Walleij <linus.walleij@linaro.org>2014-11-03 16:28:03 +0300
commitb5b7b487431b01619f2947d91dadd7c7a233692e (patch)
treebc1bc9164747b69410948f154610530aa17d68e4 /drivers/gpio/gpio-mvebu.c
parent5bb5428956d3eecb428e72e7f521ff6ac767384b (diff)
downloadlinux-b5b7b487431b01619f2947d91dadd7c7a233692e.tar.xz
gpio: mvebu: add suspend/resume support
This commit adds the implementation of ->suspend() and ->resume() platform_driver hooks in order to save and restore the state of the GPIO configuration. In order to achieve that, additional fields are added to the mvebu_gpio_chip structure. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-mvebu.c')
-rw-r--r--drivers/gpio/gpio-mvebu.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c
index 418e38650363..dd5545c293d4 100644
--- a/drivers/gpio/gpio-mvebu.c
+++ b/drivers/gpio/gpio-mvebu.c
@@ -83,6 +83,14 @@ struct mvebu_gpio_chip {
int irqbase;
struct irq_domain *domain;
int soc_variant;
+
+ /* Used to preserve GPIO registers accross suspend/resume */
+ u32 out_reg;
+ u32 io_conf_reg;
+ u32 blink_en_reg;
+ u32 in_pol_reg;
+ u32 edge_mask_regs[4];
+ u32 level_mask_regs[4];
};
/*
@@ -554,6 +562,93 @@ static const struct of_device_id mvebu_gpio_of_match[] = {
};
MODULE_DEVICE_TABLE(of, mvebu_gpio_of_match);
+static int mvebu_gpio_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
+ int i;
+
+ mvchip->out_reg = readl(mvebu_gpioreg_out(mvchip));
+ mvchip->io_conf_reg = readl(mvebu_gpioreg_io_conf(mvchip));
+ mvchip->blink_en_reg = readl(mvebu_gpioreg_blink(mvchip));
+ mvchip->in_pol_reg = readl(mvebu_gpioreg_in_pol(mvchip));
+
+ switch (mvchip->soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ mvchip->edge_mask_regs[0] =
+ readl(mvchip->membase + GPIO_EDGE_MASK_OFF);
+ mvchip->level_mask_regs[0] =
+ readl(mvchip->membase + GPIO_LEVEL_MASK_OFF);
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ for (i = 0; i < 2; i++) {
+ mvchip->edge_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_EDGE_MASK_MV78200_OFF(i));
+ mvchip->level_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_LEVEL_MASK_MV78200_OFF(i));
+ }
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ for (i = 0; i < 4; i++) {
+ mvchip->edge_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_EDGE_MASK_ARMADAXP_OFF(i));
+ mvchip->level_mask_regs[i] =
+ readl(mvchip->membase +
+ GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
+ }
+ break;
+ default:
+ BUG();
+ }
+
+ return 0;
+}
+
+static int mvebu_gpio_resume(struct platform_device *pdev)
+{
+ struct mvebu_gpio_chip *mvchip = platform_get_drvdata(pdev);
+ int i;
+
+ writel(mvchip->out_reg, mvebu_gpioreg_out(mvchip));
+ writel(mvchip->io_conf_reg, mvebu_gpioreg_io_conf(mvchip));
+ writel(mvchip->blink_en_reg, mvebu_gpioreg_blink(mvchip));
+ writel(mvchip->in_pol_reg, mvebu_gpioreg_in_pol(mvchip));
+
+ switch (mvchip->soc_variant) {
+ case MVEBU_GPIO_SOC_VARIANT_ORION:
+ writel(mvchip->edge_mask_regs[0],
+ mvchip->membase + GPIO_EDGE_MASK_OFF);
+ writel(mvchip->level_mask_regs[0],
+ mvchip->membase + GPIO_LEVEL_MASK_OFF);
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_MV78200:
+ for (i = 0; i < 2; i++) {
+ writel(mvchip->edge_mask_regs[i],
+ mvchip->membase + GPIO_EDGE_MASK_MV78200_OFF(i));
+ writel(mvchip->level_mask_regs[i],
+ mvchip->membase +
+ GPIO_LEVEL_MASK_MV78200_OFF(i));
+ }
+ break;
+ case MVEBU_GPIO_SOC_VARIANT_ARMADAXP:
+ for (i = 0; i < 4; i++) {
+ writel(mvchip->edge_mask_regs[i],
+ mvchip->membase +
+ GPIO_EDGE_MASK_ARMADAXP_OFF(i));
+ writel(mvchip->level_mask_regs[i],
+ mvchip->membase +
+ GPIO_LEVEL_MASK_ARMADAXP_OFF(i));
+ }
+ break;
+ default:
+ BUG();
+ }
+
+ return 0;
+}
+
static int mvebu_gpio_probe(struct platform_device *pdev)
{
struct mvebu_gpio_chip *mvchip;
@@ -577,6 +672,8 @@ static int mvebu_gpio_probe(struct platform_device *pdev)
if (!mvchip)
return -ENOMEM;
+ platform_set_drvdata(pdev, mvchip);
+
if (of_property_read_u32(pdev->dev.of_node, "ngpios", &ngpios)) {
dev_err(&pdev->dev, "Missing ngpios OF property\n");
return -ENODEV;
@@ -735,5 +832,7 @@ static struct platform_driver mvebu_gpio_driver = {
.of_match_table = mvebu_gpio_of_match,
},
.probe = mvebu_gpio_probe,
+ .suspend = mvebu_gpio_suspend,
+ .resume = mvebu_gpio_resume,
};
module_platform_driver(mvebu_gpio_driver);