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authoreric miao <eric.miao@marvell.com>2008-03-11 04:46:28 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-04-19 14:29:05 +0400
commitc0a596d6a138ea281bed4ff3018c07c45dd245a2 (patch)
treeab3c25663433bf8c3f16026d969f9722d4ecff92 /arch/arm/mach-pxa/mfp-pxa2xx.c
parent9b02b2df0099c083ea40ba8c7068e3dcbe381302 (diff)
downloadlinux-c0a596d6a138ea281bed4ff3018c07c45dd245a2.tar.xz
[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.c93
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 f85f681c0393..22097a1707cc 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;