diff options
Diffstat (limited to 'arch/arm/mach-pxa/mfp-pxa2xx.c')
| -rw-r--r-- | arch/arm/mach-pxa/mfp-pxa2xx.c | 225 |
1 files changed, 152 insertions, 73 deletions
diff --git a/arch/arm/mach-pxa/mfp-pxa2xx.c b/arch/arm/mach-pxa/mfp-pxa2xx.c index 925575f10ac..2061c00c8ea 100644 --- a/arch/arm/mach-pxa/mfp-pxa2xx.c +++ b/arch/arm/mach-pxa/mfp-pxa2xx.c @@ -25,7 +25,12 @@ #include "generic.h" -#define PGSR(x) __REG2(0x40F00020, ((x) & 0x60) >> 3) +#define gpio_to_bank(gpio) ((gpio) >> 5) + +#define PGSR(x) __REG2(0x40F00020, (x) << 2) +#define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3) +#define GAFR_L(x) __GAFR(0, x) +#define GAFR_U(x) __GAFR(1, x) #define PWER_WE35 (1 << 24) @@ -38,49 +43,59 @@ struct gpio_desc { }; static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; +static int gpio_nr; -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 unsigned long gpdr_lpm[4]; static int __mfp_config_gpio(unsigned gpio, unsigned long c) { unsigned long gafr, mask = GPIO_bit(gpio); - int fn; + int bank = gpio_to_bank(gpio); + int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */ + int shft = (gpio & 0xf) << 1; + int fn = MFP_AF(c); + int dir = c & MFP_DIR_OUT; - fn = MFP_AF(c); if (fn > 3) return -EINVAL; - /* alternate function and direction */ - gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2)); - GAFR(gpio) = gafr | (fn << ((gpio & 0xf) * 2)); + /* alternate function and direction at run-time */ + gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank); + gafr = (gafr & ~(0x3 << shft)) | (fn << shft); - if (c & MFP_DIR_OUT) + if (uorl == 0) + GAFR_L(bank) = gafr; + else + GAFR_U(bank) = gafr; + + if (dir == MFP_DIR_OUT) GPDR(gpio) |= mask; else GPDR(gpio) &= ~mask; - if (__mfp_config_lpm(gpio, c & MFP_LPM_STATE_MASK)) - return -EINVAL; + /* alternate function and direction at low power mode */ + switch (c & MFP_LPM_STATE_MASK) { + case MFP_LPM_DRIVE_HIGH: + PGSR(bank) |= mask; + dir = MFP_DIR_OUT; + break; + case MFP_LPM_DRIVE_LOW: + PGSR(bank) &= ~mask; + dir = MFP_DIR_OUT; + break; + case MFP_LPM_DEFAULT: + break; + default: + /* warning and fall through, treat as MFP_LPM_DEFAULT */ + pr_warning("%s: GPIO%d: unsupported low power mode\n", + __func__, gpio); + break; + } + + if (dir == MFP_DIR_OUT) + gpdr_lpm[bank] |= mask; + else + gpdr_lpm[bank] &= ~mask; /* give early warning if MFP_LPM_CAN_WAKEUP is set on the * configurations of those pins not able to wakeup @@ -91,7 +106,7 @@ static int __mfp_config_gpio(unsigned gpio, unsigned long c) return -EINVAL; } - if ((c & MFP_LPM_CAN_WAKEUP) && (c & MFP_DIR_OUT)) { + if ((c & MFP_LPM_CAN_WAKEUP) && (dir == MFP_DIR_OUT)) { pr_warning("%s: output GPIO%d unable to wakeup\n", __func__, gpio); return -EINVAL; @@ -135,7 +150,7 @@ void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) { - unsigned long flags; + unsigned long flags, c; int gpio; gpio = __mfp_validate(mfp); @@ -143,7 +158,11 @@ void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) return; local_irq_save(flags); - __mfp_config_lpm(gpio, lpm); + + c = gpio_desc[gpio].config; + c = (c & ~MFP_LPM_STATE_MASK) | lpm; + __mfp_config_gpio(gpio, c); + local_irq_restore(flags); } @@ -187,23 +206,22 @@ int gpio_set_wake(unsigned int gpio, unsigned int on) } #ifdef CONFIG_PXA25x -static int __init pxa25x_mfp_init(void) +static void __init pxa25x_mfp_init(void) { int i; - if (cpu_is_pxa25x()) { - for (i = 0; i <= 84; i++) - gpio_desc[i].valid = 1; + for (i = 0; i <= 84; i++) + gpio_desc[i].valid = 1; - for (i = 0; i <= 15; i++) { - gpio_desc[i].can_wakeup = 1; - gpio_desc[i].mask = GPIO_bit(i); - } + for (i = 0; i <= 15; i++) { + gpio_desc[i].can_wakeup = 1; + gpio_desc[i].mask = GPIO_bit(i); } - return 0; + gpio_nr = 85; } -postcore_initcall(pxa25x_mfp_init); +#else +static inline void pxa25x_mfp_init(void) {} #endif /* CONFIG_PXA25x */ #ifdef CONFIG_PXA27x @@ -233,45 +251,106 @@ int keypad_set_wake(unsigned int on) return 0; } -static int __init pxa27x_mfp_init(void) +static void __init pxa27x_mfp_init(void) { int i, gpio; - if (cpu_is_pxa27x()) { - for (i = 0; i <= 120; i++) { - /* skip GPIO2, 5, 6, 7, 8, they are not - * valid pins allow configuration - */ - if (i == 2 || i == 5 || i == 6 || - i == 7 || i == 8) - continue; + for (i = 0; i <= 120; i++) { + /* skip GPIO2, 5, 6, 7, 8, they are not + * valid pins allow configuration + */ + if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) + continue; - gpio_desc[i].valid = 1; - } + gpio_desc[i].valid = 1; + } - /* Keypad GPIOs */ - for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { - gpio = pxa27x_pkwr_gpio[i]; - gpio_desc[gpio].can_wakeup = 1; - gpio_desc[gpio].keypad_gpio = 1; - gpio_desc[gpio].mask = 1 << i; - } + /* Keypad GPIOs */ + for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { + gpio = pxa27x_pkwr_gpio[i]; + gpio_desc[gpio].can_wakeup = 1; + gpio_desc[gpio].keypad_gpio = 1; + gpio_desc[gpio].mask = 1 << i; + } - /* Overwrite GPIO13 as a PWER wakeup source */ - for (i = 0; i <= 15; i++) { - /* skip GPIO2, 5, 6, 7, 8 */ - if (GPIO_bit(i) & 0x1e4) - continue; + /* Overwrite GPIO13 as a PWER wakeup source */ + for (i = 0; i <= 15; i++) { + /* skip GPIO2, 5, 6, 7, 8 */ + if (GPIO_bit(i) & 0x1e4) + continue; - gpio_desc[i].can_wakeup = 1; - gpio_desc[i].mask = GPIO_bit(i); - } + gpio_desc[i].can_wakeup = 1; + gpio_desc[i].mask = GPIO_bit(i); + } + + gpio_desc[35].can_wakeup = 1; + gpio_desc[35].mask = PWER_WE35; + + gpio_nr = 121; +} +#else +static inline void pxa27x_mfp_init(void) {} +#endif /* CONFIG_PXA27x */ + +#ifdef CONFIG_PM +static unsigned long saved_gafr[2][4]; +static unsigned long saved_gpdr[4]; - gpio_desc[35].can_wakeup = 1; - gpio_desc[35].mask = PWER_WE35; +static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state) +{ + int i; + + for (i = 0; i <= gpio_to_bank(gpio_nr); i++) { + + saved_gafr[0][i] = GAFR_L(i); + saved_gafr[1][i] = GAFR_U(i); + saved_gpdr[i] = GPDR(i * 32); + + GPDR(i * 32) = gpdr_lpm[i]; } + return 0; +} +static int pxa2xx_mfp_resume(struct sys_device *d) +{ + int i; + + for (i = 0; i <= gpio_to_bank(gpio_nr); i++) { + GAFR_L(i) = saved_gafr[0][i]; + GAFR_U(i) = saved_gafr[1][i]; + GPDR(i * 32) = saved_gpdr[i]; + } + PSSR = PSSR_RDH | PSSR_PH; return 0; } -postcore_initcall(pxa27x_mfp_init); -#endif /* CONFIG_PXA27x */ +#else +#define pxa2xx_mfp_suspend NULL +#define pxa2xx_mfp_resume NULL +#endif + +struct sysdev_class pxa2xx_mfp_sysclass = { + .name = "mfp", + .suspend = pxa2xx_mfp_suspend, + .resume = pxa2xx_mfp_resume, +}; + +static int __init pxa2xx_mfp_init(void) +{ + int i; + + if (!cpu_is_pxa2xx()) + return 0; + + if (cpu_is_pxa25x()) + pxa25x_mfp_init(); + + if (cpu_is_pxa27x()) + pxa27x_mfp_init(); + + /* initialize gafr_run[], pgsr_lpm[] from existing values */ + for (i = 0; i <= gpio_to_bank(gpio_nr); i++) + gpdr_lpm[i] = GPDR(i * 32); + + return sysdev_class_register(&pxa2xx_mfp_sysclass); +} +postcore_initcall(pxa2xx_mfp_init); |