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 <[email protected]> Reviewed-by: Shevchenko, Andriy <[email protected]> Signed-off-by: Weike Chen <[email protected]> --- drivers/gpio/gpio-dwapb.c | 67 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c index e0ab988..1055cb3 100644 --- a/drivers/gpio/gpio-dwapb.c +++ b/drivers/gpio/gpio-dwapb.c @@ -560,10 +560,77 @@ static const struct of_device_id dwapb_of_match[] = { }; MODULE_DEVICE_TABLE(of, dwapb_of_match); +#if defined CONFIG_PM_SLEEP +/* Store GPIO context across system-wide suspend/resume transitions */ +static struct gpio_saved_regs { + unsigned long data; + unsigned long dir; + unsigned long int_en; + unsigned long int_mask; + unsigned long int_type; + unsigned long int_pol; + unsigned long int_deb; +} saved_regs; + +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; + + spin_lock_irqsave(&bgc->lock, flags); + + saved_regs.int_mask = dwapb_read(gpio, GPIO_INTMASK); + saved_regs.int_en = dwapb_read(gpio, GPIO_INTEN); + saved_regs.int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE); + saved_regs.int_pol = dwapb_read(gpio, GPIO_INT_POLARITY); + saved_regs.int_type = dwapb_read(gpio, GPIO_INTTYPE_LEVEL); + saved_regs.dir = dwapb_read(gpio, GPIO_SWPORTA_DDR); + saved_regs.data = dwapb_read(gpio, GPIO_SWPORTA_DR); + + /* 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; + + spin_lock_irqsave(&bgc->lock, flags); + + dwapb_write(gpio, GPIO_SWPORTA_DR, saved_regs.data); + dwapb_write(gpio, GPIO_SWPORTA_DDR, saved_regs.dir); + dwapb_write(gpio, GPIO_INTTYPE_LEVEL, saved_regs.int_type); + dwapb_write(gpio, GPIO_INT_POLARITY, saved_regs.int_pol); + dwapb_write(gpio, GPIO_PORTA_DEBOUNCE, saved_regs.int_deb); + dwapb_write(gpio, GPIO_INTEN, saved_regs.int_en); + dwapb_write(gpio, GPIO_INTMASK, saved_regs.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, -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
