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pinctrl: armada-37xx: add suspend/resume support 

Add suspend/resume hooks in pinctrl driver to handle S2RAM operations.

Beyond the traditional register save/restore operations, these hooks
also keep the GPIOs used for both-edge IRQ synchronized between their
level (low/high) and expected IRQ polarity (falling/rising edge).

Since pinctrl is an infrastructure module, its resume should be issued
prior to other IO drivers. The pinctrl PM operations are requested at
early/late stages for this reason.

Suggested-by: Ken Ma <make@marvell.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Miquel Raynal 2018-06-26 16:06:13 +02:00 committed by Linus Walleij
parent 6c5d0736e9
commit 6a230edd5d
1 changed files with 118 additions and 0 deletions
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118
drivers/pinctrl/mvebu/pinctrl-armada-37xx.c
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@ -80,6 +80,18 @@ struct armada_37xx_pmx_func {
unsigned int ngroups;
};
struct armada_37xx_pm_state {
u32 out_en_l;
u32 out_en_h;
u32 out_val_l;
u32 out_val_h;
u32 irq_en_l;
u32 irq_en_h;
u32 irq_pol_l;
u32 irq_pol_h;
u32 selection;
};
struct armada_37xx_pinctrl {
struct regmap *regmap;
void __iomem *base;
@ -94,6 +106,7 @@ struct armada_37xx_pinctrl {
unsigned int ngroups;
struct armada_37xx_pmx_func *funcs;
unsigned int nfuncs;
struct armada_37xx_pm_state pm;
};
#define PIN_GRP(_name, _start, _nr, _mask, _func1, _func2) \
@ -996,6 +1009,110 @@ static int armada_37xx_pinctrl_register(struct platform_device *pdev,
return 0;
}
#if defined(CONFIG_PM)
static int armada_3700_pinctrl_suspend(struct device *dev)
{
struct armada_37xx_pinctrl *info = dev_get_drvdata(dev);
/* Save GPIO state */
regmap_read(info->regmap, OUTPUT_EN, &info->pm.out_en_l);
regmap_read(info->regmap, OUTPUT_EN + sizeof(u32), &info->pm.out_en_h);
regmap_read(info->regmap, OUTPUT_VAL, &info->pm.out_val_l);
regmap_read(info->regmap, OUTPUT_VAL + sizeof(u32),
&info->pm.out_val_h);
info->pm.irq_en_l = readl(info->base + IRQ_EN);
info->pm.irq_en_h = readl(info->base + IRQ_EN + sizeof(u32));
info->pm.irq_pol_l = readl(info->base + IRQ_POL);
info->pm.irq_pol_h = readl(info->base + IRQ_POL + sizeof(u32));
/* Save pinctrl state */
regmap_read(info->regmap, SELECTION, &info->pm.selection);
return 0;
}
static int armada_3700_pinctrl_resume(struct device *dev)
{
struct armada_37xx_pinctrl *info = dev_get_drvdata(dev);
struct gpio_chip *gc;
struct irq_domain *d;
int i;
/* Restore GPIO state */
regmap_write(info->regmap, OUTPUT_EN, info->pm.out_en_l);
regmap_write(info->regmap, OUTPUT_EN + sizeof(u32),
info->pm.out_en_h);
regmap_write(info->regmap, OUTPUT_VAL, info->pm.out_val_l);
regmap_write(info->regmap, OUTPUT_VAL + sizeof(u32),
info->pm.out_val_h);
/*
* Input levels may change during suspend, which is not monitored at
* that time. GPIOs used for both-edge IRQs may not be synchronized
* anymore with their polarities (rising/falling edge) and must be
* re-configured manually.
*/
gc = &info->gpio_chip;
d = gc->irq.domain;
for (i = 0; i < gc->ngpio; i++) {
u32 irq_bit = BIT(i % GPIO_PER_REG);
u32 mask, *irq_pol, input_reg, virq, type, level;
if (i < GPIO_PER_REG) {
mask = info->pm.irq_en_l;
irq_pol = &info->pm.irq_pol_l;
input_reg = INPUT_VAL;
} else {
mask = info->pm.irq_en_h;
irq_pol = &info->pm.irq_pol_h;
input_reg = INPUT_VAL + sizeof(u32);
}
if (!(mask & irq_bit))
continue;
virq = irq_find_mapping(d, i);
type = irq_get_trigger_type(virq);
/*
* Synchronize level and polarity for both-edge irqs:
* - a high input level expects a falling edge,
* - a low input level exepects a rising edge.
*/
if ((type & IRQ_TYPE_SENSE_MASK) ==
IRQ_TYPE_EDGE_BOTH) {
regmap_read(info->regmap, input_reg, &level);
if ((*irq_pol ^ level) & irq_bit)
*irq_pol ^= irq_bit;
}
}
writel(info->pm.irq_en_l, info->base + IRQ_EN);
writel(info->pm.irq_en_h, info->base + IRQ_EN + sizeof(u32));
writel(info->pm.irq_pol_l, info->base + IRQ_POL);
writel(info->pm.irq_pol_h, info->base + IRQ_POL + sizeof(u32));
/* Restore pinctrl state */
regmap_write(info->regmap, SELECTION, info->pm.selection);
return 0;
}
/*
* Since pinctrl is an infrastructure module, its resume should be issued prior
* to other IO drivers.
*/
static const struct dev_pm_ops armada_3700_pinctrl_pm_ops = {
.suspend_late = armada_3700_pinctrl_suspend,
.resume_early = armada_3700_pinctrl_resume,
};
#define PINCTRL_ARMADA_37XX_DEV_PM_OPS (&armada_3700_pinctrl_pm_ops)
#else
#define PINCTRL_ARMADA_37XX_DEV_PM_OPS NULL
#endif /* CONFIG_PM */
static const struct of_device_id armada_37xx_pinctrl_of_match[] = {
{
.compatible = "marvell,armada3710-sb-pinctrl",
@ -1049,6 +1166,7 @@ static struct platform_driver armada_37xx_pinctrl_driver = {
.driver = {
.name = "armada-37xx-pinctrl",
.of_match_table = armada_37xx_pinctrl_of_match,
.pm = PINCTRL_ARMADA_37XX_DEV_PM_OPS,
},
};