diff options
Diffstat (limited to 'arch/arm/mach-pxa/mfp-pxa2xx.c')
| -rw-r--r-- | arch/arm/mach-pxa/mfp-pxa2xx.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/mfp-pxa2xx.c b/arch/arm/mach-pxa/mfp-pxa2xx.c new file mode 100644 index 00000000000..22097a1707c --- /dev/null +++ b/arch/arm/mach-pxa/mfp-pxa2xx.c @@ -0,0 +1,245 @@ +/* + * linux/arch/arm/mach-pxa/mfp-pxa2xx.c + * + * PXA2xx pin mux configuration support + * + * The GPIOs on PXA2xx can be configured as one of many alternate + * functions, this is by concept samilar to the MFP configuration + * on PXA3xx, what's more important, the low power pin state and + * wakeup detection are also supported by the same framework. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/sysdev.h> + +#include <asm/arch/hardware.h> +#include <asm/arch/pxa-regs.h> +#include <asm/arch/mfp-pxa2xx.h> + +#include "generic.h" + +#define PGSR(x) __REG2(0x40F00020, ((x) & 0x60) >> 3) + +#define PWER_WE35 (1 << 24) + +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; +}; + +static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; + +static int __mfp_config_gpio(unsigned gpio, unsigned long c) +{ + unsigned long gafr, mask = GPIO_bit(gpio); + int fn; + + 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)); + + if (c & MFP_DIR_OUT) + GPDR(gpio) |= mask; + 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); + return -EINVAL; + } + + /* 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 ((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; +} + +void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) +{ + unsigned long flags; + unsigned long *c; + int i, gpio; + + for (i = 0, c = mfp_cfgs; i < num; i++, c++) { + + gpio = mfp_to_gpio(MFP_PIN(*c)); + + if (!gpio_desc[gpio].valid) { + pr_warning("%s: GPIO%d is invalid pin\n", + __func__, gpio); + continue; + } + + local_irq_save(flags); + + gpio_desc[gpio].config = *c; + __mfp_config_gpio(gpio, *c); + + local_irq_restore(flags); + } +} + +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) +{ + int i; + + if (cpu_is_pxa25x()) { + 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); + } + } + + return 0; +} +postcore_initcall(pxa25x_mfp_init); +#endif /* CONFIG_PXA25x */ + +#ifdef CONFIG_PXA27x +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; + + 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; + + 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; + } + + /* 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[35].can_wakeup = 1; + gpio_desc[35].mask = PWER_WE35; + } + + return 0; +} +postcore_initcall(pxa27x_mfp_init); +#endif /* CONFIG_PXA27x */ |