LXR uboot/arch/avr32/include/asm/arch-common/portmux-gpio.h

   1/*
   2 * Copyright (C) 2008 Atmel Corporation
   3 *
   4 * See file CREDITS for list of people who contributed to this
   5 * project.
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License as
   9 * published by the Free Software Foundation; either version 2 of
  10 * the License, or (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20 * MA 02111-1307 USA
  21 */
  22#ifndef __AVR32_PORTMUX_GPIO_H__
  23#define __AVR32_PORTMUX_GPIO_H__
  24
  25#include <asm/io.h>
  26
  27/* Register layout for this specific device */
  28#include <asm/arch/gpio-impl.h>
  29
  30/* Register access macros */
  31#define gpio_readl(port, reg)                                           \
  32        __raw_readl(&((struct gpio_regs *)port)->reg)
  33#define gpio_writel(gpio, reg, value)                                   \
  34        __raw_writel(value, &((struct gpio_regs *)port)->reg)
  35
  36/* Portmux API starts here. See doc/README.AVR32-port-muxing */
  37
  38enum portmux_function {
  39        PORTMUX_FUNC_A,
  40        PORTMUX_FUNC_B,
  41        PORTMUX_FUNC_C,
  42        PORTMUX_FUNC_D,
  43};
  44
  45#define PORTMUX_DIR_INPUT       (0 << 0)
  46#define PORTMUX_DIR_OUTPUT      (1 << 0)
  47#define PORTMUX_INIT_LOW        (0 << 1)
  48#define PORTMUX_INIT_HIGH       (1 << 1)
  49#define PORTMUX_PULL_UP         (1 << 2)
  50#define PORTMUX_PULL_DOWN       (2 << 2)
  51#define PORTMUX_BUSKEEPER       (3 << 2)
  52#define PORTMUX_DRIVE_MIN       (0 << 4)
  53#define PORTMUX_DRIVE_LOW       (1 << 4)
  54#define PORTMUX_DRIVE_HIGH      (2 << 4)
  55#define PORTMUX_DRIVE_MAX       (3 << 4)
  56#define PORTMUX_OPEN_DRAIN      (1 << 6)
  57
  58void portmux_select_peripheral(void *port, unsigned long pin_mask,
  59                enum portmux_function func, unsigned long flags);
  60void portmux_select_gpio(void *port, unsigned long pin_mask,
  61                unsigned long flags);
  62
  63/* Internal helper functions */
  64
  65static inline void *gpio_pin_to_port(unsigned int pin)
  66{
  67        return (void *)GPIO_BASE + (pin >> 5) * 0x200;
  68}
  69
  70static inline void __gpio_set_output_value(void *port, unsigned int pin,
  71                int value)
  72{
  73        if (value)
  74                gpio_writel(port, OVRS, 1 << pin);
  75        else
  76                gpio_writel(port, OVRC, 1 << pin);
  77}
  78
  79static inline int __gpio_get_input_value(void *port, unsigned int pin)
  80{
  81        return (gpio_readl(port, PVR) >> pin) & 1;
  82}
  83
  84void gpio_set_output_value(unsigned int pin, int value);
  85int gpio_get_input_value(unsigned int pin);
  86
  87/* GPIO API starts here */
  88
  89/*
  90 * GCC doesn't realize that the constant case is extremely trivial,
  91 * so we need to help it make the right decision by using
  92 * always_inline.
  93 */
  94__attribute__((always_inline))
  95static inline void gpio_set_value(unsigned int pin, int value)
  96{
  97        if (__builtin_constant_p(pin))
  98                __gpio_set_output_value(gpio_pin_to_port(pin),
  99                                pin & 0x1f, value);
 100        else
 101                gpio_set_output_value(pin, value);
 102}
 103
 104__attribute__((always_inline))
 105static inline int gpio_get_value(unsigned int pin)
 106{
 107        if (__builtin_constant_p(pin))
 108                return __gpio_get_input_value(gpio_pin_to_port(pin),
 109                                pin & 0x1f);
 110        else
 111                return gpio_get_input_value(pin);
 112}
 113
 114#endif /* __AVR32_PORTMUX_GPIO_H__ */
 115