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[ARM] pxa: add pxa2xx_mfp_set_lpm() to facilitate low power state change

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Some boards want to change low power state of pins on-the-fly, this
function helps to facilitate that operation instead of switching
back-n-forth between two configurations with pxa2xx_mfp_config().

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Eric Miao 2008-06-16 09:47:47 +08:00 committed by Russell King
parent 0fedb0cad6
commit 566b450c33
2 changed files with 38 additions and 14 deletions
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51
arch/arm/mach-pxa/mfp-pxa2xx.c
View File

@ -39,6 +39,28 @@ struct gpio_desc {
static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
static int __mfp_config_lpm(unsigned gpio, unsigned long lpm)
{
unsigned mask = GPIO_bit(gpio);
/* low power state */
switch (lpm) {
case MFP_LPM_DRIVE_HIGH:
PGSR(gpio) |= mask;
break;
case MFP_LPM_DRIVE_LOW:
PGSR(gpio) &= ~mask;
break;
case MFP_LPM_INPUT:
break;
default:
pr_warning("%s: invalid low power state for GPIO%d\n",
__func__, gpio);
return -EINVAL;
}
return 0;
}
static int __mfp_config_gpio(unsigned gpio, unsigned long c)
{
unsigned long gafr, mask = GPIO_bit(gpio);
@ -57,21 +79,8 @@ static int __mfp_config_gpio(unsigned gpio, unsigned long c)
else
GPDR(gpio) &= ~mask;
/* low power state */
switch (c & MFP_LPM_STATE_MASK) {
case MFP_LPM_DRIVE_HIGH:
PGSR(gpio) |= mask;
break;
case MFP_LPM_DRIVE_LOW:
PGSR(gpio) &= ~mask;
break;
case MFP_LPM_INPUT:
break;
default:
pr_warning("%s: invalid low power state for GPIO%d\n",
__func__, gpio);
if (__mfp_config_lpm(gpio, c & MFP_LPM_STATE_MASK))
return -EINVAL;
}
/* give early warning if MFP_LPM_CAN_WAKEUP is set on the
* configurations of those pins not able to wakeup
@ -124,6 +133,20 @@ void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
}
}
void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
{
unsigned long flags;
int gpio;
gpio = __mfp_validate(mfp);
if (gpio < 0)
return;
local_irq_save(flags);
__mfp_config_lpm(gpio, lpm);
local_irq_restore(flags);
}
int gpio_set_wake(unsigned int gpio, unsigned int on)
{
struct gpio_desc *d;

1
include/asm-arm/arch-pxa/mfp-pxa2xx.h
View File

@ -128,5 +128,6 @@
#define GPIO84_GPIO MFP_CFG_IN(GPIO84, AF0)
extern void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num);
extern void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm);
extern int gpio_set_wake(unsigned int gpio, unsigned int on);
#endif /* __ASM_ARCH_MFP_PXA2XX_H */