Commit c0a596d6 authored by eric miao's avatar eric miao Committed by Russell King
Browse files

[ARM] pxa: allow dynamic enable/disable of GPIO wakeup for pxa{25x,27x} 



Changes include:

1. rename MFP_LPM_WAKEUP_ENABLE into MFP_LPM_CAN_WAKEUP to indicate
   the board capability of this pin to wakeup the system

2. add gpio_set_wake() and keypad_set_wake() to allow dynamically
   enable/disable wakeup from GPIOs and keypad GPIO

   * these functions are currently kept in mfp-pxa2xx.c due to their
     dependency to the MFP configuration

3. pxa2xx_mfp_config() only gives early warning if MFP_LPM_CAN_WAKEUP
   is set on incorrect pins

So that the GPIO's wakeup capability is now decided by the following:

   a) processor's capability: (only those GPIOs which have dedicated
      bits within PWER/PRER/PFER can wakeup the system), this is
      initialized by pxa{25x,27x}_init_mfp()

   b) board design decides:
      - whether the pin is designed to wakeup the system (some of
        the GPIOs are configured as other functions, which is not
        intended to be a wakeup source), by OR'ing the pin config
        with MFP_LPM_CAN_WAKEUP

      - which edge the pin is designed to wakeup the system, this
        may depends on external peripherals/connections, which is
        totally board specific; this is indicated by MFP_LPM_EDGE_*

   c) the corresponding device's (most likely the gpio_keys.c) wakeup
      attribute:

Signed-off-by: default avatareric miao <eric.miao@marvell.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 9b02b2df

arch/arm/mach-pxa/mfp-pxa2xx.c

+74 −19
Original line number Diff line number Diff line
@@ -28,15 +28,17 @@ 


#define PWER_WE35	(1 << 24)



static struct {

struct gpio_desc {

	unsigned	valid		: 1;

	unsigned	can_wakeup	: 1;

	unsigned	keypad_gpio	: 1;

	unsigned int	mask; /* bit mask in PWER or PKWR */

	unsigned long	config;

} gpio_desc[MFP_PIN_GPIO127 + 1];

};



static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];



static inline int __mfp_config_gpio(unsigned gpio, unsigned long c)

static int __mfp_config_gpio(unsigned gpio, unsigned long c)

{

	unsigned long gafr, mask = GPIO_bit(gpio);

	int fn;
@@ -70,26 +72,19 @@ static inline int __mfp_config_gpio(unsigned gpio, unsigned long c) 
		return -EINVAL;

	}



	/* wakeup enabling */

	if ((c & MFP_LPM_WAKEUP_ENABLE) == 0)

		return 0;



	if (!gpio_desc[gpio].can_wakeup || c & MFP_DIR_OUT) {

	/* give early warning if MFP_LPM_CAN_WAKEUP is set on the

	 * configurations of those pins not able to wakeup

	 */

	if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {

		pr_warning("%s: GPIO%d unable to wakeup\n",

				__func__, gpio);

		return -EINVAL;

	}



	if (gpio_desc[gpio].keypad_gpio)

		PKWR |= gpio_desc[gpio].mask;

	else {

		PWER |= gpio_desc[gpio].mask;



		if (c & MFP_LPM_EDGE_RISE)

			PRER |= gpio_desc[gpio].mask;



		if (c & MFP_LPM_EDGE_FALL)

			PFER |= gpio_desc[gpio].mask;

	if ((c & MFP_LPM_CAN_WAKEUP) && (c & MFP_DIR_OUT)) {

		pr_warning("%s: output GPIO%d unable to wakeup\n",

				__func__, gpio);

		return -EINVAL;

	}



	return 0;
@@ -120,6 +115,45 @@ void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) 
	}

}



int gpio_set_wake(unsigned int gpio, unsigned int on)

{

	struct gpio_desc *d;

	unsigned long c;



	if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))

		return -EINVAL;



	d = &gpio_desc[gpio];

	c = d->config;



	if (!d->valid)

		return -EINVAL;



	if (d->keypad_gpio)

		return -EINVAL;



	if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {

		if (on) {

			PWER |= d->mask;



			if (c & MFP_LPM_EDGE_RISE)

				PRER |= d->mask;

			else

				PRER &= ~d->mask;



			if (c & MFP_LPM_EDGE_FALL)

				PFER |= d->mask;

			else

				PFER &= ~d->mask;

		} else {

			PWER &= ~d->mask;

			PRER &= ~d->mask;

			PFER &= ~d->mask;

		}

	}

	return 0;

}



#ifdef CONFIG_PXA25x

static int __init pxa25x_mfp_init(void)

{
@@ -141,11 +175,32 @@ postcore_initcall(pxa25x_mfp_init); 
#endif /* CONFIG_PXA25x */



#ifdef CONFIG_PXA27x

static int pxa27x_pkwr_gpio[] __initdata = {

static int pxa27x_pkwr_gpio[] = {

	13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,

	95, 96, 97, 98, 99, 100, 101, 102

};



int keypad_set_wake(unsigned int on)

{

	unsigned int i, gpio, mask = 0;



	if (!on) {

		PKWR = 0;

		return 0;

	}



	for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {



		gpio = pxa27x_pkwr_gpio[i];



		if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)

			mask |= gpio_desc[gpio].mask;

	}



	PKWR = mask;

	return 0;

}



static int __init pxa27x_mfp_init(void)

{

	int i, gpio;

arch/arm/mach-pxa/pxa25x.c

+5 −18
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <asm/hardware.h>

#include <asm/arch/irqs.h>

#include <asm/arch/pxa-regs.h>

#include <asm/arch/mfp-pxa25x.h>

#include <asm/arch/pm.h>

#include <asm/arch/dma.h>
@@ -230,24 +231,10 @@ static inline void pxa25x_init_pm(void) {} 
static int pxa25x_set_wake(unsigned int irq, unsigned int on)

{

	int gpio = IRQ_TO_GPIO(irq);

	uint32_t gpio_bit, mask = 0;



	if (gpio >= 0 && gpio <= 15) {

		gpio_bit = GPIO_bit(gpio);

		mask = gpio_bit;

		if (on) {

			if (GRER(gpio) | gpio_bit)

				PRER |= gpio_bit;

			else

				PRER &= ~gpio_bit;

	uint32_t mask = 0;



			if (GFER(gpio) | gpio_bit)

				PFER |= gpio_bit;

			else

				PFER &= ~gpio_bit;

		}

		goto set_pwer;

	}

	if (gpio >= 0 && gpio < 85)

		return gpio_set_wake(gpio, on);



	if (irq == IRQ_RTCAlrm) {

		mask = PWER_RTC;

arch/arm/mach-pxa/pxa27x.c

+5 −26
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <asm/arch/irqs.h>

#include <asm/arch/pxa-regs.h>

#include <asm/arch/pxa2xx-regs.h>

#include <asm/arch/mfp-pxa27x.h>

#include <asm/arch/ohci.h>

#include <asm/arch/pm.h>

#include <asm/arch/dma.h>
@@ -286,37 +287,16 @@ static inline void pxa27x_init_pm(void) {} 
/* PXA27x:  Various gpios can issue wakeup events.  This logic only

 * handles the simple cases, not the WEMUX2 and WEMUX3 options

 */

#define PXA27x_GPIO_NOWAKE_MASK \

        ((1 << 8) | (1 << 7) | (1 << 6) | (1 << 5) | (1 << 2))

#define WAKEMASK(gpio) \

        (((gpio) <= 15) \

                 ? ((1 << (gpio)) & ~PXA27x_GPIO_NOWAKE_MASK) \

                 : ((gpio == 35) ? (1 << 24) : 0))



static int pxa27x_set_wake(unsigned int irq, unsigned int on)

{

	int gpio = IRQ_TO_GPIO(irq);

	uint32_t mask;



	if ((gpio >= 0 && gpio <= 15) || (gpio == 35)) {

		if (WAKEMASK(gpio) == 0)

			return -EINVAL;



		mask = WAKEMASK(gpio);



		if (on) {

			if (GRER(gpio) | GPIO_bit(gpio))

				PRER |= mask;

			else

				PRER &= ~mask;

	if (gpio >= 0 && gpio < 128)

		return gpio_set_wake(gpio, on);



			if (GFER(gpio) | GPIO_bit(gpio))

				PFER |= mask;

			else

				PFER &= ~mask;

		}

		goto set_pwer;

	}

	if (irq == IRQ_KEYPAD)

		return keypad_set_wake(on);



	switch (irq) {

	case IRQ_RTCAlrm:
@@ -329,7 +309,6 @@ static int pxa27x_set_wake(unsigned int irq, unsigned int on) 
		return -EINVAL;

	}



set_pwer:

	if (on)

		PWER |= mask;

	else

include/asm-arm/arch-pxa/mfp-pxa27x.h

+1 −0
Original line number Diff line number Diff line
@@ -428,4 +428,5 @@ 
#define GPIO112_nMSINS		MFP_CFG_IN(GPIO112, AF2)

#define GPIO32_MSSCLK		MFP_CFG_OUT(GPIO32, AF1, DRIVE_LOW)



extern int keypad_set_wake(unsigned int on);

#endif /* __ASM_ARCH_MFP_PXA27X_H */

include/asm-arm/arch-pxa/mfp-pxa2xx.h

+6 −5
Original line number Diff line number Diff line
@@ -24,13 +24,13 @@ 
#define MFP_DIR_MASK		(0x1 << 23)

#define MFP_DIR(x)		(((x) >> 23) & 0x1)



#define MFP_LPM_WAKEUP_ENABLE	(0x1 << 24)

#define WAKEUP_ON_EDGE_RISE	(MFP_LPM_WAKEUP_ENABLE | MFP_LPM_EDGE_RISE)

#define WAKEUP_ON_EDGE_FALL	(MFP_LPM_WAKEUP_ENABLE | MFP_LPM_EDGE_FALL)

#define WAKEUP_ON_EDGE_BOTH	(MFP_LPM_WAKEUP_ENABLE | MFP_LPM_EDGE_BOTH)

#define MFP_LPM_CAN_WAKEUP	(0x1 << 24)

#define WAKEUP_ON_EDGE_RISE	(MFP_LPM_CAN_WAKEUP | MFP_LPM_EDGE_RISE)

#define WAKEUP_ON_EDGE_FALL	(MFP_LPM_CAN_WAKEUP | MFP_LPM_EDGE_FALL)

#define WAKEUP_ON_EDGE_BOTH	(MFP_LPM_CAN_WAKEUP | MFP_LPM_EDGE_BOTH)



/* specifically for enabling wakeup on keypad GPIOs */

#define WAKEUP_ON_LEVEL_HIGH	(MFP_LPM_WAKEUP_ENABLE)

#define WAKEUP_ON_LEVEL_HIGH	(MFP_LPM_CAN_WAKEUP)



#define MFP_CFG_IN(pin, af)		\

	((MFP_CFG_DEFAULT & ~(MFP_AF_MASK | MFP_DIR_MASK)) |\
@@ -128,4 +128,5 @@ 
#define GPIO84_GPIO	MFP_CFG_IN(GPIO84, AF0)



extern void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num);

extern int gpio_set_wake(unsigned int gpio, unsigned int on);

#endif /* __ASM_ARCH_MFP_PXA2XX_H */

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