diff options
author | eric miao <eric.miao@marvell.com> | 2008-03-11 09:46:28 +0800 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-04-19 11:29:05 +0100 |
commit | c0a596d6a138ea281bed4ff3018c07c45dd245a2 (patch) | |
tree | ab3c25663433bf8c3f16026d969f9722d4ecff92 /arch/arm/mach-pxa/mfp-pxa2xx.c | |
parent | 9b02b2df0099c083ea40ba8c7068e3dcbe381302 (diff) |
[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: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-pxa/mfp-pxa2xx.c')
-rw-r--r-- | arch/arm/mach-pxa/mfp-pxa2xx.c | 93 |
1 files changed, 74 insertions, 19 deletions
diff --git a/arch/arm/mach-pxa/mfp-pxa2xx.c b/arch/arm/mach-pxa/mfp-pxa2xx.c index f85f681c039..22097a1707c 100644 --- a/arch/arm/mach-pxa/mfp-pxa2xx.c +++ b/arch/arm/mach-pxa/mfp-pxa2xx.c @@ -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; |