| /* |
| * TI DaVinci GPIO Support |
| * |
| * Copyright (c) 2006 David Brownell |
| * Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| #ifndef __DAVINCI_GPIO_H |
| #define __DAVINCI_GPIO_H |
| |
| #include <linux/io.h> |
| #include <asm/arch/hardware.h> |
| |
| /* |
| * basic gpio routines |
| * |
| * board-specific init should be done by arch/.../.../board-XXX.c (maybe |
| * initializing banks together) rather than boot loaders; kexec() won't |
| * go through boot loaders. |
| * |
| * the gpio clock will be turned on when gpios are used, and you may also |
| * need to pay attention to PINMUX0 and PINMUX1 to be sure those pins are |
| * used as gpios, not with other peripherals. |
| * |
| * GPIOs are numbered 0..(DAVINCI_N_GPIO-1). For documentation, and maybe |
| * for later updates, code should write GPIO(N) or: |
| * - GPIOV18(N) for 1.8V pins, N in 0..53; same as GPIO(0)..GPIO(53) |
| * - GPIOV33(N) for 3.3V pins, N in 0..17; same as GPIO(54)..GPIO(70) |
| * |
| * For GPIO IRQs use gpio_to_irq(GPIO(N)) or gpio_to_irq(GPIOV33(N)) etc |
| * for now, that's != GPIO(N) |
| */ |
| #define GPIO(X) (X) /* 0 <= X <= 70 */ |
| #define GPIOV18(X) (X) /* 1.8V i/o; 0 <= X <= 53 */ |
| #define GPIOV33(X) ((X)+54) /* 3.3V i/o; 0 <= X <= 17 */ |
| |
| struct gpio_controller { |
| u32 dir; |
| u32 out_data; |
| u32 set_data; |
| u32 clr_data; |
| u32 in_data; |
| u32 set_rising; |
| u32 clr_rising; |
| u32 set_falling; |
| u32 clr_falling; |
| u32 intstat; |
| }; |
| |
| /* The __gpio_to_controller() and __gpio_mask() functions inline to constants |
| * with constant parameters; or in outlined code they execute at runtime. |
| * |
| * You'd access the controller directly when reading or writing more than |
| * one gpio value at a time, and to support wired logic where the value |
| * being driven by the cpu need not match the value read back. |
| * |
| * These are NOT part of the cross-platform GPIO interface |
| */ |
| static inline struct gpio_controller *__iomem |
| __gpio_to_controller(unsigned gpio) |
| { |
| void *__iomem ptr; |
| |
| if (gpio < 32) |
| ptr = (void *__iomem)IO_ADDRESS(DAVINCI_GPIO_BASE + 0x10); |
| else if (gpio < 64) |
| ptr = (void *__iomem)IO_ADDRESS(DAVINCI_GPIO_BASE + 0x38); |
| else if (gpio < DAVINCI_N_GPIO) |
| ptr = (void *__iomem)IO_ADDRESS(DAVINCI_GPIO_BASE + 0x60); |
| else |
| ptr = NULL; |
| return ptr; |
| } |
| |
| static inline u32 __gpio_mask(unsigned gpio) |
| { |
| return 1 << (gpio % 32); |
| } |
| |
| /* The get/set/clear functions will inline when called with constant |
| * parameters, for low-overhead bitbanging. Illegal constant parameters |
| * cause link-time errors. |
| * |
| * Otherwise, calls with variable parameters use outlined functions. |
| */ |
| extern int __error_inval_gpio(void); |
| |
| extern void __gpio_set(unsigned gpio, int value); |
| extern int __gpio_get(unsigned gpio); |
| |
| static inline void gpio_set_value(unsigned gpio, int value) |
| { |
| if (__builtin_constant_p(value)) { |
| struct gpio_controller *__iomem g; |
| u32 mask; |
| |
| if (gpio >= DAVINCI_N_GPIO) |
| __error_inval_gpio(); |
| |
| g = __gpio_to_controller(gpio); |
| mask = __gpio_mask(gpio); |
| if (value) |
| __raw_writel(mask, &g->set_data); |
| else |
| __raw_writel(mask, &g->clr_data); |
| return; |
| } |
| |
| __gpio_set(gpio, value); |
| } |
| |
| /* Returns zero or nonzero; works for gpios configured as inputs OR |
| * as outputs. |
| * |
| * NOTE: changes in reported values are synchronized to the GPIO clock. |
| * This is most easily seen after calling gpio_set_value() and then immediatly |
| * gpio_get_value(), where the gpio_get_value() would return the old value |
| * until the GPIO clock ticks and the new value gets latched. |
| */ |
| |
| static inline int gpio_get_value(unsigned gpio) |
| { |
| struct gpio_controller *__iomem g; |
| |
| if (!__builtin_constant_p(gpio)) |
| return __gpio_get(gpio); |
| |
| if (gpio >= DAVINCI_N_GPIO) |
| return __error_inval_gpio(); |
| |
| g = __gpio_to_controller(gpio); |
| return !!(__gpio_mask(gpio) & __raw_readl(&g->in_data)); |
| } |
| |
| /* powerup default direction is IN */ |
| extern int gpio_direction_input(unsigned gpio); |
| extern int gpio_direction_output(unsigned gpio, int value); |
| |
| #include <asm-generic/gpio.h> /* cansleep wrappers */ |
| |
| extern int gpio_request(unsigned gpio, const char *tag); |
| extern void gpio_free(unsigned gpio); |
| |
| static inline int gpio_to_irq(unsigned gpio) |
| { |
| return DAVINCI_N_AINTC_IRQ + gpio; |
| } |
| |
| static inline int irq_to_gpio(unsigned irq) |
| { |
| return irq - DAVINCI_N_AINTC_IRQ; |
| } |
| |
| #endif /* __DAVINCI_GPIO_H */ |