diff options
| -rw-r--r-- | drivers/gpio/gpio-brcmstb.c | 56 |
1 files changed, 50 insertions, 6 deletions
diff --git a/drivers/gpio/gpio-brcmstb.c b/drivers/gpio/gpio-brcmstb.c index 16b66d51f109..113dc07fbfbe 100644 --- a/drivers/gpio/gpio-brcmstb.c +++ b/drivers/gpio/gpio-brcmstb.c @@ -20,6 +20,7 @@ #include <linux/irqdomain.h> #include <linux/irqchip/chained_irq.h> #include <linux/interrupt.h> +#include <linux/reboot.h> #define GIO_BANK_SIZE 0x20 #define GIO_ODEN(bank) (((bank) * GIO_BANK_SIZE) + 0x00) @@ -48,6 +49,7 @@ struct brcmstb_gpio_priv { int gpio_base; bool can_wake; int parent_wake_irq; + struct notifier_block reboot_notifier; }; #define MAX_GPIO_PER_BANK 32 @@ -167,10 +169,9 @@ static int brcmstb_gpio_irq_set_type(struct irq_data *d, unsigned int type) return 0; } -static int brcmstb_gpio_irq_set_wake(struct irq_data *d, unsigned int enable) +static int brcmstb_gpio_priv_set_wake(struct brcmstb_gpio_priv *priv, + unsigned int enable) { - struct gpio_chip *gc = irq_data_get_irq_chip_data(d); - struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc); int ret = 0; /* @@ -188,6 +189,14 @@ static int brcmstb_gpio_irq_set_wake(struct irq_data *d, unsigned int enable) return ret; } +static int brcmstb_gpio_irq_set_wake(struct irq_data *d, unsigned int enable) +{ + struct gpio_chip *gc = irq_data_get_irq_chip_data(d); + struct brcmstb_gpio_priv *priv = brcmstb_gpio_gc_to_priv(gc); + + return brcmstb_gpio_priv_set_wake(priv, enable); +} + static irqreturn_t brcmstb_gpio_wake_irq_handler(int irq, void *data) { struct brcmstb_gpio_priv *priv = data; @@ -246,6 +255,19 @@ static void brcmstb_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) chained_irq_exit(chip, desc); } +static int brcmstb_gpio_reboot(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct brcmstb_gpio_priv *priv = + container_of(nb, struct brcmstb_gpio_priv, reboot_notifier); + + /* Enable GPIO for S5 cold boot */ + if (action == SYS_POWER_OFF) + brcmstb_gpio_priv_set_wake(priv, 1); + + return NOTIFY_DONE; +} + /* Make sure that the number of banks matches up between properties */ static int brcmstb_gpio_sanity_check_banks(struct device *dev, struct device_node *np, struct resource *res) @@ -276,6 +298,12 @@ static int brcmstb_gpio_remove(struct platform_device *pdev) if (ret) dev_err(&pdev->dev, "gpiochip_remove fail in cleanup\n"); } + if (priv->reboot_notifier.notifier_call) { + ret = unregister_reboot_notifier(&priv->reboot_notifier); + if (ret) + dev_err(&pdev->dev, + "failed to unregister reboot notifier\n"); + } return ret; } @@ -333,7 +361,16 @@ static int brcmstb_gpio_irq_setup(struct platform_device *pdev, dev_warn(dev, "Couldn't get wake IRQ - GPIOs will not be able to wake from sleep"); } else { - int err = devm_request_irq(dev, priv->parent_wake_irq, + int err; + + /* + * Set wakeup capability before requesting wakeup + * interrupt, so we can process boot-time "wakeups" + * (e.g., from S5 cold boot) + */ + device_set_wakeup_capable(dev, true); + device_wakeup_enable(dev); + err = devm_request_irq(dev, priv->parent_wake_irq, brcmstb_gpio_wake_irq_handler, 0, "brcmstb-gpio-wake", priv); @@ -342,8 +379,9 @@ static int brcmstb_gpio_irq_setup(struct platform_device *pdev, return err; } - device_set_wakeup_capable(dev, true); - device_wakeup_enable(dev); + priv->reboot_notifier.notifier_call = + brcmstb_gpio_reboot; + register_reboot_notifier(&priv->reboot_notifier); priv->can_wake = true; } } @@ -445,6 +483,12 @@ static int brcmstb_gpio_probe(struct platform_device *pdev) /* not all ngpio lines are valid, will use bank width later */ gc->ngpio = MAX_GPIO_PER_BANK; + /* + * Mask all interrupts by default, since wakeup interrupts may + * be retained from S5 cold boot + */ + bank->bgc.write_reg(reg_base + GIO_MASK(bank->id), 0); + err = gpiochip_add(gc); if (err) { dev_err(dev, "Could not add gpiochip for bank %d\n", |