[PATCH] gpio/nomadik: fix sleepmode for elder Nomadik

[Linus Walleij]

From: Linus Walleij <linus.walleij at linaro.org>

The mach-nomadik machine did not compile properly due to bad
ux500-specific functions being called. Introduce new state
variables to fix this up.

Reported-by: Axel Lin <axel.lin at gmail.com>
Cc: Alessandro Rubini <rubini at unipv.it>
Cc: Prafulla Wadaskar <prafulla.wadaskar at st.com>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
 arch/arm/mach-ux500/cpu-db8500.c          |    3 ++
 arch/arm/plat-nomadik/include/plat/gpio.h |    1 +
 drivers/gpio/gpio-nomadik.c               |   40 +++++++++++++++++++++--------
 3 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index c3c4176..4598b06 100644
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -159,6 +159,9 @@ static void __init db8500_add_gpios(void)
 		/* No custom data yet */
 	};
 
+	if (cpu_is_u8500v2())
+		pdata.supports_sleepmode = true;
+
 	dbx500_add_gpios(ARRAY_AND_SIZE(db8500_gpio_base),
 			 IRQ_DB8500_GPIO0, &pdata);
 }
diff --git a/arch/arm/plat-nomadik/include/plat/gpio.h b/arch/arm/plat-nomadik/include/plat/gpio.h
index ea19a5b..d5d7e65 100644
--- a/arch/arm/plat-nomadik/include/plat/gpio.h
+++ b/arch/arm/plat-nomadik/include/plat/gpio.h
@@ -90,6 +90,7 @@ struct nmk_gpio_platform_data {
 	int num_gpio;
 	u32 (*get_secondary_status)(unsigned int bank);
 	void (*set_ioforce)(bool enable);
+	bool supports_sleepmode;
 };
 
 #endif /* __ASM_PLAT_GPIO_H */
diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c
index 4961ef9..2c212c7 100644
--- a/drivers/gpio/gpio-nomadik.c
+++ b/drivers/gpio/gpio-nomadik.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2008,2009 STMicroelectronics
  * Copyright (C) 2009 Alessandro Rubini <rubini at unipv.it>
  *   Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar at st.com>
+ * Copyright (C) 2011 Linus Walleij <linus.walleij at linaro.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -49,6 +50,7 @@ struct nmk_gpio_chip {
 	u32 (*get_secondary_status)(unsigned int bank);
 	void (*set_ioforce)(bool enable);
 	spinlock_t lock;
+	bool sleepmode;
 	/* Keep track of configured edges */
 	u32 edge_rising;
 	u32 edge_falling;
@@ -393,14 +395,25 @@ EXPORT_SYMBOL(nmk_config_pins_sleep);
  * @gpio: pin number
  * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE,
  *
- * Sets the sleep mode of a pin.  If @mode is NMK_GPIO_SLPM_INPUT, the pin is
- * 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.
+ * This register is actually in the pinmux layer, not the GPIO block itself.
+ * The GPIO1B_SLPM register defines the GPIO mode when SLEEP/DEEP-SLEEP
+ * mode is entered (i.e. when signal IOFORCE is HIGH by the platform code).
+ * Each GPIO can be configured to be forced into GPIO mode when IOFORCE is
+ * HIGH, overriding the normal setting defined by GPIO_AFSELx registers.
+ * When IOFORCE returns LOW (by software, after SLEEP/DEEP-SLEEP exit),
+ * the GPIOs return to the normal setting defined by GPIO_AFSELx registers.
  *
- * 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.
+ * If @mode is NMK_GPIO_SLPM_INPUT, the corresponding GPIO is switched to GPIO
+ * mode when signal IOFORCE is HIGH (i.e. when SLEEP/DEEP-SLEEP mode is
+ * entered) regardless of the altfunction selected. Also wake-up detection is
+ * ENABLED.
+ *
+ * If @mode is NMK_GPIO_SLPM_NOCHANGE, the corresponding GPIO remains
+ * controlled by NMK_GPIO_DATC, NMK_GPIO_DATS, NMK_GPIO_DIR, NMK_GPIO_PDIS
+ * (for altfunction GPIO) or respective on-chip peripherals (for other
+ * altfuncs) when IOFORCE is HIGH. Also wake-up detection DISABLED.
+ *
+ * Note that enable_irq_wake() will automatically enable wakeup detection.
  */
 int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
 {
@@ -551,6 +564,12 @@ static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
 static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
 				int gpio, bool on)
 {
+	if (nmk_chip->sleepmode) {
+		__nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base,
+				    on ? NMK_GPIO_SLPM_WAKEUP_ENABLE
+				    : NMK_GPIO_SLPM_WAKEUP_DISABLE);
+	}
+
 	__nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on);
 }
 
@@ -901,7 +920,7 @@ void nmk_gpio_wakeups_suspend(void)
 		writel(chip->fwimsc & chip->real_wake,
 		       chip->addr + NMK_GPIO_FWIMSC);
 
-		if (cpu_is_u8500v2()) {
+		if (chip->sleepmode) {
 			chip->slpm = readl(chip->addr + NMK_GPIO_SLPC);
 
 			/* 0 -> wakeup enable */
@@ -923,7 +942,7 @@ void nmk_gpio_wakeups_resume(void)
 		writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC);
 		writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC);
 
-		if (cpu_is_u8500v2())
+		if (chip->sleepmode)
 			writel(chip->slpm, chip->addr + NMK_GPIO_SLPC);
 	}
 }
@@ -1010,6 +1029,7 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev)
 	nmk_chip->secondary_parent_irq = secondary_irq;
 	nmk_chip->get_secondary_status = pdata->get_secondary_status;
 	nmk_chip->set_ioforce = pdata->set_ioforce;
+	nmk_chip->sleepmode = pdata->supports_sleepmode;
 	spin_lock_init(&nmk_chip->lock);
 
 	chip = &nmk_chip->chip;
@@ -1065,5 +1085,3 @@ core_initcall(nmk_gpio_init);
 MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini");
 MODULE_DESCRIPTION("Nomadik GPIO Driver");
 MODULE_LICENSE("GPL");
-
-
-- 
1.7.3.2