| /* |
| * 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) |
| |
| static struct { |
| 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 inline 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; |
| } |
| |
| /* wakeup enabling */ |
| if ((c & MFP_LPM_WAKEUP_ENABLE) == 0) |
| return 0; |
| |
| if (!gpio_desc[gpio].can_wakeup || c & MFP_DIR_OUT) { |
| 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; |
| } |
| |
| 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); |
| } |
| } |
| |
| #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[] __initdata = { |
| 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, |
| 95, 96, 97, 98, 99, 100, 101, 102 |
| }; |
| |
| 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 */ |