diff options
Diffstat (limited to 'arch/arm/mach-pxa/mfp.c')
| -rw-r--r-- | arch/arm/mach-pxa/mfp.c | 59 |
1 files changed, 57 insertions, 2 deletions
diff --git a/arch/arm/mach-pxa/mfp.c b/arch/arm/mach-pxa/mfp.c index c66b1cd7df64..ec1b2d8f61c4 100644 --- a/arch/arm/mach-pxa/mfp.c +++ b/arch/arm/mach-pxa/mfp.c @@ -17,6 +17,7 @@ #include <linux/kernel.h> #include <linux/init.h> #include <linux/io.h> +#include <linux/sysdev.h> #include <asm/hardware.h> #include <asm/arch/mfp.h> @@ -87,8 +88,13 @@ static inline void __mfp_config_run(struct pxa3xx_mfp_pin *p) static inline void __mfp_config_lpm(struct pxa3xx_mfp_pin *p) { - if (mfp_configured(p) && p->mfpr_lpm != p->mfpr_run) - mfpr_writel(p->mfpr_off, p->mfpr_lpm); + if (mfp_configured(p)) { + unsigned long mfpr_clr = (p->mfpr_run & ~MFPR_EDGE_BOTH) | MFPR_EDGE_CLEAR; + if (mfpr_clr != p->mfpr_run) + mfpr_writel(p->mfpr_off, mfpr_clr); + if (p->mfpr_lpm != mfpr_clr) + mfpr_writel(p->mfpr_off, p->mfpr_lpm); + } } void pxa3xx_mfp_config(unsigned long *mfp_cfgs, int num) @@ -189,3 +195,52 @@ void __init pxa3xx_init_mfp(void) for (i = 0; i < ARRAY_SIZE(mfp_table); i++) mfp_table[i].config = -1; } + +#ifdef CONFIG_PM +/* + * Configure the MFPs appropriately for suspend/resume. + * FIXME: this should probably depend on which system state we're + * entering - for instance, we might not want to place MFP pins in + * a pull-down mode if they're an active low chip select, and we're + * just entering standby. + */ +static int pxa3xx_mfp_suspend(struct sys_device *d, pm_message_t state) +{ + int pin; + + for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++) { + struct pxa3xx_mfp_pin *p = &mfp_table[pin]; + __mfp_config_lpm(p); + } + return 0; +} + +static int pxa3xx_mfp_resume(struct sys_device *d) +{ + int pin; + + for (pin = 0; pin < ARRAY_SIZE(mfp_table); pin++) { + struct pxa3xx_mfp_pin *p = &mfp_table[pin]; + __mfp_config_run(p); + } + return 0; +} + +static struct sysdev_class mfp_sysclass = { + set_kset_name("mfp"), + .suspend = pxa3xx_mfp_suspend, + .resume = pxa3xx_mfp_resume, +}; + +static struct sys_device mfp_device = { + .id = 0, + .cls = &mfp_sysclass, +}; + +static int __init mfp_init_devicefs(void) +{ + sysdev_class_register(&mfp_sysclass); + return sysdev_register(&mfp_device); +} +device_initcall(mfp_init_devicefs); +#endif |