ARM: 6353/1: nomadik-gpio: add SLPM register handing for DB8500v2

The SLPM register enables/disables wakeup detection on DB8500v2.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
index 977c8f9..014da39 100644 (file)
--- a/arch/arm/plat-nomadik/gpio.c
+++ b/arch/arm/plat-nomadik/gpio.c
@@ -118,8 +118,8 @@ static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
                [3] /* illegal */       = "??"
        };
        static const char *slpmnames[] = {
-               [NMK_GPIO_SLPM_INPUT]           = "input",
-               [NMK_GPIO_SLPM_NOCHANGE]        = "no-change",
+               [NMK_GPIO_SLPM_INPUT]           = "input/wakeup",
+               [NMK_GPIO_SLPM_NOCHANGE]        = "no-change/no-wakeup",
        };
 
        int pin = PIN_NUM(cfg);
@@ -200,6 +200,10 @@ EXPORT_SYMBOL(nmk_config_pins);
  * changed to an input (with pullup/down enabled) in sleep and deep sleep.  If
  * @mode is NMK_GPIO_SLPM_NOCHANGE, the pin remains in the state it was
  * configured even when in sleep and deep sleep.
+ *
+ * On DB8500v2 onwards, this setting loses the previous meaning and instead
+ * indicates if wakeup detection is enabled on the pin.  Note that
+ * enable_irq_wake() will automatically enable wakeup detection.
  */
 int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
 {
@@ -367,7 +371,27 @@ static void nmk_gpio_irq_unmask(unsigned int irq)
 
 static int nmk_gpio_irq_set_wake(unsigned int irq, unsigned int on)
 {
-       return nmk_gpio_irq_modify(irq, WAKE, on);
+       struct nmk_gpio_chip *nmk_chip;
+       unsigned long flags;
+       int gpio;
+
+       gpio = NOMADIK_IRQ_TO_GPIO(irq);
+       nmk_chip = get_irq_chip_data(irq);
+       if (!nmk_chip)
+               return -EINVAL;
+
+       spin_lock_irqsave(&nmk_chip->lock, flags);
+#ifdef CONFIG_ARCH_U8500
+       if (cpu_is_u8500v2()) {
+               __nmk_gpio_set_slpm(nmk_chip, gpio,
+                                   on ? NMK_GPIO_SLPM_WAKEUP_ENABLE
+                                      : NMK_GPIO_SLPM_WAKEUP_DISABLE);
+       }
+#endif
+       __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on);
+       spin_unlock_irqrestore(&nmk_chip->lock, flags);
+
+       return 0;
 }
 
 static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)

diff --git a/arch/arm/plat-nomadik/include/plat/gpio.h b/arch/arm/plat-nomadik/include/plat/gpio.h
index aba3551..67b113d 100644 (file)
--- a/arch/arm/plat-nomadik/include/plat/gpio.h
+++ b/arch/arm/plat-nomadik/include/plat/gpio.h
@@ -65,7 +65,9 @@ enum nmk_gpio_pull {
 /* Sleep mode */
 enum nmk_gpio_slpm {
        NMK_GPIO_SLPM_INPUT,
+       NMK_GPIO_SLPM_WAKEUP_ENABLE = NMK_GPIO_SLPM_INPUT,
        NMK_GPIO_SLPM_NOCHANGE,
+       NMK_GPIO_SLPM_WAKEUP_DISABLE = NMK_GPIO_SLPM_NOCHANGE,
 };
 
 extern int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode);

diff --git a/arch/arm/plat-nomadik/include/plat/pincfg.h b/arch/arm/plat-nomadik/include/plat/pincfg.h
index 7eed11c..432a201 100644 (file)
--- a/arch/arm/plat-nomadik/include/plat/pincfg.h
+++ b/arch/arm/plat-nomadik/include/plat/pincfg.h
@@ -24,7 +24,7 @@
  *
  * PIN_CFG_DEFAULT - default config (0):
  *                  pull up/down = disabled
- *                  sleep mode = input
+ *                  sleep mode = input/wakeup
  *
  * PIN_CFG        - default config with alternate function
  * PIN_CFG_PULL           - default config with alternate function and pull up/down
@@ -55,6 +55,9 @@ typedef unsigned long pin_cfg_t;
 #define PIN_SLPM(x)            (((x) & PIN_SLPM_MASK) >> PIN_SLPM_SHIFT)
 #define PIN_SLPM_INPUT         (NMK_GPIO_SLPM_INPUT << PIN_SLPM_SHIFT)
 #define PIN_SLPM_NOCHANGE      (NMK_GPIO_SLPM_NOCHANGE << PIN_SLPM_SHIFT)
+/* These two replace the above in DB8500v2+ */
+#define PIN_SLPM_WAKEUP_ENABLE (NMK_GPIO_SLPM_WAKEUP_ENABLE << PIN_SLPM_SHIFT)
+#define PIN_SLPM_WAKEUP_DISABLE        (NMK_GPIO_SLPM_WAKEUP_DISABLE << PIN_SLPM_SHIFT)
 
 #define PIN_CFG_DEFAULT                (PIN_PULL_NONE | PIN_SLPM_INPUT)