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gpio: zynq: Add support for suspend resume

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Add support for suspend resume. Now that we can lose context across
a suspend/ resume cycle. Add support for the context restore.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Shubhrajyoti Datta 2017-08-07 13:01:54 +02:00 committed by Linus Walleij
parent 275b13a655
commit e11de4de28
1 changed files with 79 additions and 3 deletions
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82
drivers/gpio/gpio-zynq.c
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@ -99,6 +99,17 @@
/* set to differentiate zynq from zynqmp, 0=zynqmp, 1=zynq */
#define ZYNQ_GPIO_QUIRK_IS_ZYNQ BIT(0)
struct gpio_regs {
u32 datamsw[ZYNQMP_GPIO_MAX_BANK];
u32 datalsw[ZYNQMP_GPIO_MAX_BANK];
u32 dirm[ZYNQMP_GPIO_MAX_BANK];
u32 outen[ZYNQMP_GPIO_MAX_BANK];
u32 int_en[ZYNQMP_GPIO_MAX_BANK];
u32 int_dis[ZYNQMP_GPIO_MAX_BANK];
u32 int_type[ZYNQMP_GPIO_MAX_BANK];
u32 int_polarity[ZYNQMP_GPIO_MAX_BANK];
u32 int_any[ZYNQMP_GPIO_MAX_BANK];
};
/**
* struct zynq_gpio - gpio device private data structure
* @chip: instance of the gpio_chip
@ -106,6 +117,7 @@
* @clk: clock resource for this controller
* @irq: interrupt for the GPIO device
* @p_data: pointer to platform data
* @context: context registers
*/
struct zynq_gpio {
struct gpio_chip chip;
@ -113,6 +125,7 @@ struct zynq_gpio {
struct clk *clk;
int irq;
const struct zynq_platform_data *p_data;
struct gpio_regs context;
};
/**
@ -560,14 +573,72 @@ static void zynq_gpio_irqhandler(struct irq_desc *desc)
chained_irq_exit(irqchip, desc);
}
static void zynq_gpio_save_context(struct zynq_gpio *gpio)
{
unsigned int bank_num;
for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
gpio->context.datalsw[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num));
gpio->context.datamsw[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num));
gpio->context.dirm[bank_num] = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_DIRM_OFFSET(bank_num));
gpio->context.int_en[bank_num] = readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTMASK_OFFSET(bank_num));
gpio->context.int_type[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
gpio->context.int_polarity[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
gpio->context.int_any[bank_num] =
readl_relaxed(gpio->base_addr +
ZYNQ_GPIO_INTANY_OFFSET(bank_num));
}
}
static void zynq_gpio_restore_context(struct zynq_gpio *gpio)
{
unsigned int bank_num;
for (bank_num = 0; bank_num < gpio->p_data->max_bank; bank_num++) {
writel_relaxed(gpio->context.datalsw[bank_num],
gpio->base_addr +
ZYNQ_GPIO_DATA_LSW_OFFSET(bank_num));
writel_relaxed(gpio->context.datamsw[bank_num],
gpio->base_addr +
ZYNQ_GPIO_DATA_MSW_OFFSET(bank_num));
writel_relaxed(gpio->context.dirm[bank_num],
gpio->base_addr +
ZYNQ_GPIO_DIRM_OFFSET(bank_num));
writel_relaxed(gpio->context.int_en[bank_num],
gpio->base_addr +
ZYNQ_GPIO_INTEN_OFFSET(bank_num));
writel_relaxed(gpio->context.int_type[bank_num],
gpio->base_addr +
ZYNQ_GPIO_INTTYPE_OFFSET(bank_num));
writel_relaxed(gpio->context.int_polarity[bank_num],
gpio->base_addr +
ZYNQ_GPIO_INTPOL_OFFSET(bank_num));
writel_relaxed(gpio->context.int_any[bank_num],
gpio->base_addr +
ZYNQ_GPIO_INTANY_OFFSET(bank_num));
}
}
static int __maybe_unused zynq_gpio_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
int irq = platform_get_irq(pdev, 0);
struct irq_data *data = irq_get_irq_data(irq);
struct zynq_gpio *gpio = platform_get_drvdata(pdev);
if (!irqd_is_wakeup_set(data))
if (!irqd_is_wakeup_set(data)) {
zynq_gpio_save_context(gpio);
return pm_runtime_force_suspend(dev);
}
return 0;
}
@ -577,9 +648,14 @@ static int __maybe_unused zynq_gpio_resume(struct device *dev)
struct platform_device *pdev = to_platform_device(dev);
int irq = platform_get_irq(pdev, 0);
struct irq_data *data = irq_get_irq_data(irq);
struct zynq_gpio *gpio = platform_get_drvdata(pdev);
int ret;
if (!irqd_is_wakeup_set(data))
return pm_runtime_force_resume(dev);
if (!irqd_is_wakeup_set(data)) {
ret = pm_runtime_force_resume(dev);
zynq_gpio_restore_context(gpio);
return ret;
}
return 0;
}