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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: Hock Leong Kweh <hock.leong.kweh@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Weike Chen <alvin.chen@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Weike Chen 2014-09-17 09:18:42 -07:00 committed by Linus Walleij
parent 5d60d9efe1
commit 1e960dbb7b
1 changed files with 115 additions and 0 deletions
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115
drivers/gpio/gpio-dwapb.c
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@ -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,