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Commit 1e960dbb authored by Weike Chen's avatar Weike Chen Committed by Linus Walleij
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GPIO: gpio-dwapb: Suspend & Resume PM enabling



This patch enables suspend and resume mode for the power management, and
it is based on Josef Ahmad's previous work.

Reviewed-by: default avatarHock Leong Kweh <hock.leong.kweh@intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: default avatarWeike Chen <alvin.chen@intel.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 5d60d9ef
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+115 −0
Original line number Diff line number Diff line
@@ -51,10 +51,28 @@

struct dwapb_gpio;

#ifdef CONFIG_PM_SLEEP
/* Store GPIO context across system-wide suspend/resume transitions */
struct dwapb_context {
	u32 data;
	u32 dir;
	u32 ext;
	u32 int_en;
	u32 int_mask;
	u32 int_type;
	u32 int_pol;
	u32 int_deb;
};
#endif

struct dwapb_gpio_port {
	struct bgpio_chip	bgc;
	bool			is_registered;
	struct dwapb_gpio	*gpio;
#ifdef CONFIG_PM_SLEEP
	struct dwapb_context	*ctx;
#endif
	unsigned int		idx;
};

struct dwapb_gpio {
@@ -381,6 +399,13 @@ static int dwapb_gpio_add_port(struct dwapb_gpio *gpio,

	port = &gpio->ports[offs];
	port->gpio = gpio;
	port->idx = pp->idx;

#ifdef CONFIG_PM_SLEEP
	port->ctx = devm_kzalloc(gpio->dev, sizeof(*port->ctx), GFP_KERNEL);
	if (!port->ctx)
		return -ENOMEM;
#endif

	dat = gpio->regs + GPIO_EXT_PORTA + (pp->idx * GPIO_EXT_PORT_SIZE);
	set = gpio->regs + GPIO_SWPORTA_DR + (pp->idx * GPIO_SWPORT_DR_SIZE);
@@ -586,10 +611,100 @@ static const struct of_device_id dwapb_of_match[] = {
};
MODULE_DEVICE_TABLE(of, dwapb_of_match);

#ifdef CONFIG_PM_SLEEP
static int dwapb_gpio_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
	struct bgpio_chip *bgc	= &gpio->ports[0].bgc;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&bgc->lock, flags);
	for (i = 0; i < gpio->nr_ports; i++) {
		unsigned int offset;
		unsigned int idx = gpio->ports[i].idx;
		struct dwapb_context *ctx = gpio->ports[i].ctx;

		BUG_ON(ctx == 0);

		offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE;
		ctx->dir = dwapb_read(gpio, offset);

		offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE;
		ctx->data = dwapb_read(gpio, offset);

		offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE;
		ctx->ext = dwapb_read(gpio, offset);

		/* Only port A can provide interrupts */
		if (idx == 0) {
			ctx->int_mask	= dwapb_read(gpio, GPIO_INTMASK);
			ctx->int_en	= dwapb_read(gpio, GPIO_INTEN);
			ctx->int_pol	= dwapb_read(gpio, GPIO_INT_POLARITY);
			ctx->int_type	= dwapb_read(gpio, GPIO_INTTYPE_LEVEL);
			ctx->int_deb	= dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);

			/* Mask out interrupts */
			dwapb_write(gpio, GPIO_INTMASK, 0xffffffff);
		}
	}
	spin_unlock_irqrestore(&bgc->lock, flags);

	return 0;
}

static int dwapb_gpio_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct dwapb_gpio *gpio = platform_get_drvdata(pdev);
	struct bgpio_chip *bgc	= &gpio->ports[0].bgc;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&bgc->lock, flags);
	for (i = 0; i < gpio->nr_ports; i++) {
		unsigned int offset;
		unsigned int idx = gpio->ports[i].idx;
		struct dwapb_context *ctx = gpio->ports[i].ctx;

		BUG_ON(ctx == 0);

		offset = GPIO_SWPORTA_DR + idx * GPIO_SWPORT_DR_SIZE;
		dwapb_write(gpio, offset, ctx->data);

		offset = GPIO_SWPORTA_DDR + idx * GPIO_SWPORT_DDR_SIZE;
		dwapb_write(gpio, offset, ctx->dir);

		offset = GPIO_EXT_PORTA + idx * GPIO_EXT_PORT_SIZE;
		dwapb_write(gpio, offset, ctx->ext);

		/* Only port A can provide interrupts */
		if (idx == 0) {
			dwapb_write(gpio, GPIO_INTTYPE_LEVEL, ctx->int_type);
			dwapb_write(gpio, GPIO_INT_POLARITY, ctx->int_pol);
			dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, ctx->int_deb);
			dwapb_write(gpio, GPIO_INTEN, ctx->int_en);
			dwapb_write(gpio, GPIO_INTMASK, ctx->int_mask);

			/* Clear out spurious interrupts */
			dwapb_write(gpio, GPIO_PORTA_EOI, 0xffffffff);
		}
	}
	spin_unlock_irqrestore(&bgc->lock, flags);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(dwapb_gpio_pm_ops, dwapb_gpio_suspend,
			 dwapb_gpio_resume);

static struct platform_driver dwapb_gpio_driver = {
	.driver		= {
		.name	= "gpio-dwapb",
		.owner	= THIS_MODULE,
		.pm	= &dwapb_gpio_pm_ops,
		.of_match_table = of_match_ptr(dwapb_of_match),
	},
	.probe		= dwapb_gpio_probe,