2 * TI DaVinci GPIO Support
4 * Copyright (c) 2006 David Brownell
5 * Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
13 #ifndef __DAVINCI_GPIO_H
14 #define __DAVINCI_GPIO_H
17 #include <asm-generic/gpio.h>
18 #include <mach/hardware.h>
19 #include <mach/irqs.h>
24 * board-specific init should be done by arch/.../.../board-XXX.c (maybe
25 * initializing banks together) rather than boot loaders; kexec() won't
26 * go through boot loaders.
28 * the gpio clock will be turned on when gpios are used, and you may also
29 * need to pay attention to PINMUX0 and PINMUX1 to be sure those pins are
30 * used as gpios, not with other peripherals.
32 * On-chip GPIOs are numbered 0..(DAVINCI_N_GPIO-1). For documentation,
33 * and maybe for later updates, code should write GPIO(N) or:
34 * - GPIOV18(N) for 1.8V pins, N in 0..53; same as GPIO(0)..GPIO(53)
35 * - GPIOV33(N) for 3.3V pins, N in 0..17; same as GPIO(54)..GPIO(70)
37 * For GPIO IRQs use gpio_to_irq(GPIO(N)) or gpio_to_irq(GPIOV33(N)) etc
38 * for now, that's != GPIO(N)
40 * GPIOs can also be on external chips, numbered after the ones built-in
41 * to the DaVinci chip. For now, they won't be usable as IRQ sources.
43 #define GPIO(X) (X) /* 0 <= X <= 70 */
44 #define GPIOV18(X) (X) /* 1.8V i/o; 0 <= X <= 53 */
45 #define GPIOV33(X) ((X)+54) /* 3.3V i/o; 0 <= X <= 17 */
47 struct gpio_controller {
60 /* The __gpio_to_controller() and __gpio_mask() functions inline to constants
61 * with constant parameters; or in outlined code they execute at runtime.
63 * You'd access the controller directly when reading or writing more than
64 * one gpio value at a time, and to support wired logic where the value
65 * being driven by the cpu need not match the value read back.
67 * These are NOT part of the cross-platform GPIO interface
69 static inline struct gpio_controller *__iomem
70 __gpio_to_controller(unsigned gpio)
75 ptr = IO_ADDRESS(DAVINCI_GPIO_BASE + 0x10);
77 ptr = IO_ADDRESS(DAVINCI_GPIO_BASE + 0x38);
78 else if (gpio < DAVINCI_N_GPIO)
79 ptr = IO_ADDRESS(DAVINCI_GPIO_BASE + 0x60);
85 static inline u32 __gpio_mask(unsigned gpio)
87 return 1 << (gpio % 32);
90 /* The get/set/clear functions will inline when called with constant
91 * parameters referencing built-in GPIOs, for low-overhead bitbanging.
93 * Otherwise, calls with variable parameters or referencing external
94 * GPIOs (e.g. on GPIO expander chips) use outlined functions.
96 static inline void gpio_set_value(unsigned gpio, int value)
98 if (__builtin_constant_p(value) && gpio < DAVINCI_N_GPIO) {
99 struct gpio_controller *__iomem g;
102 g = __gpio_to_controller(gpio);
103 mask = __gpio_mask(gpio);
105 __raw_writel(mask, &g->set_data);
107 __raw_writel(mask, &g->clr_data);
111 __gpio_set_value(gpio, value);
114 /* Returns zero or nonzero; works for gpios configured as inputs OR
115 * as outputs, at least for built-in GPIOs.
117 * NOTE: for built-in GPIOs, changes in reported values are synchronized
118 * to the GPIO clock. This is easily seen after calling gpio_set_value()
119 * and then immediately gpio_get_value(), where the gpio_get_value() will
120 * return the old value until the GPIO clock ticks and the new value gets
123 static inline int gpio_get_value(unsigned gpio)
125 struct gpio_controller *__iomem g;
127 if (!__builtin_constant_p(gpio) || gpio >= DAVINCI_N_GPIO)
128 return __gpio_get_value(gpio);
130 g = __gpio_to_controller(gpio);
131 return __gpio_mask(gpio) & __raw_readl(&g->in_data);
134 static inline int gpio_cansleep(unsigned gpio)
136 if (__builtin_constant_p(gpio) && gpio < DAVINCI_N_GPIO)
139 return __gpio_cansleep(gpio);
142 static inline int gpio_to_irq(unsigned gpio)
144 if (gpio >= DAVINCI_N_GPIO)
146 return DAVINCI_N_AINTC_IRQ + gpio;
149 static inline int irq_to_gpio(unsigned irq)
151 /* caller guarantees gpio_to_irq() succeeded */
152 return irq - DAVINCI_N_AINTC_IRQ;
155 #endif /* __DAVINCI_GPIO_H */