LXR linux/arch/unicore32/kernel/gpio.c

   1/*
   2 * linux/arch/unicore32/kernel/gpio.c
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
   7 *      Copyright (C) 2001-2010 Guan Xuetao
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 */
  13/* in FPGA, no GPIO support */
  14
  15#include <linux/init.h>
  16#include <linux/module.h>
  17#include <linux/gpio/driver.h>
  18/* FIXME: needed for gpio_set_value() - convert to use descriptors or hogs */
  19#include <linux/gpio.h>
  20#include <mach/hardware.h>
  21
  22#ifdef CONFIG_LEDS
  23#include <linux/leds.h>
  24#include <linux/platform_device.h>
  25
  26static const struct gpio_led puv3_gpio_leds[] = {
  27        { .name = "cpuhealth", .gpio = GPO_CPU_HEALTH, .active_low = 0,
  28                .default_trigger = "heartbeat", },
  29        { .name = "hdd_led", .gpio = GPO_HDD_LED, .active_low = 1,
  30                .default_trigger = "disk-activity", },
  31};
  32
  33static const struct gpio_led_platform_data puv3_gpio_led_data = {
  34        .num_leds =     ARRAY_SIZE(puv3_gpio_leds),
  35        .leds =         (void *) puv3_gpio_leds,
  36};
  37
  38static struct platform_device puv3_gpio_gpio_leds = {
  39        .name =         "leds-gpio",
  40        .id =           -1,
  41        .dev = {
  42                .platform_data = (void *) &puv3_gpio_led_data,
  43        }
  44};
  45
  46static int __init puv3_gpio_leds_init(void)
  47{
  48        platform_device_register(&puv3_gpio_gpio_leds);
  49        return 0;
  50}
  51
  52device_initcall(puv3_gpio_leds_init);
  53#endif
  54
  55static int puv3_gpio_get(struct gpio_chip *chip, unsigned offset)
  56{
  57        return !!(readl(GPIO_GPLR) & GPIO_GPIO(offset));
  58}
  59
  60static void puv3_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
  61{
  62        if (value)
  63                writel(GPIO_GPIO(offset), GPIO_GPSR);
  64        else
  65                writel(GPIO_GPIO(offset), GPIO_GPCR);
  66}
  67
  68static int puv3_direction_input(struct gpio_chip *chip, unsigned offset)
  69{
  70        unsigned long flags;
  71
  72        local_irq_save(flags);
  73        writel(readl(GPIO_GPDR) & ~GPIO_GPIO(offset), GPIO_GPDR);
  74        local_irq_restore(flags);
  75        return 0;
  76}
  77
  78static int puv3_direction_output(struct gpio_chip *chip, unsigned offset,
  79                int value)
  80{
  81        unsigned long flags;
  82
  83        local_irq_save(flags);
  84        puv3_gpio_set(chip, offset, value);
  85        writel(readl(GPIO_GPDR) | GPIO_GPIO(offset), GPIO_GPDR);
  86        local_irq_restore(flags);
  87        return 0;
  88}
  89
  90static struct gpio_chip puv3_gpio_chip = {
  91        .label                  = "gpio",
  92        .direction_input        = puv3_direction_input,
  93        .direction_output       = puv3_direction_output,
  94        .set                    = puv3_gpio_set,
  95        .get                    = puv3_gpio_get,
  96        .base                   = 0,
  97        .ngpio                  = GPIO_MAX + 1,
  98};
  99
 100void __init puv3_init_gpio(void)
 101{
 102        writel(GPIO_DIR, GPIO_GPDR);
 103#if     defined(CONFIG_PUV3_NB0916) || defined(CONFIG_PUV3_SMW0919)     \
 104        || defined(CONFIG_PUV3_DB0913)
 105        gpio_set_value(GPO_WIFI_EN, 1);
 106        gpio_set_value(GPO_HDD_LED, 1);
 107        gpio_set_value(GPO_VGA_EN, 1);
 108        gpio_set_value(GPO_LCD_EN, 1);
 109        gpio_set_value(GPO_CAM_PWR_EN, 0);
 110        gpio_set_value(GPO_LCD_VCC_EN, 1);
 111        gpio_set_value(GPO_SOFT_OFF, 1);
 112        gpio_set_value(GPO_BT_EN, 1);
 113        gpio_set_value(GPO_FAN_ON, 0);
 114        gpio_set_value(GPO_SPKR, 0);
 115        gpio_set_value(GPO_CPU_HEALTH, 1);
 116        gpio_set_value(GPO_LAN_SEL, 1);
 117/*
 118 * DO NOT modify the GPO_SET_V1 and GPO_SET_V2 in kernel
 119 *      gpio_set_value(GPO_SET_V1, 1);
 120 *      gpio_set_value(GPO_SET_V2, 1);
 121 */
 122#endif
 123        gpiochip_add_data(&puv3_gpio_chip, NULL);
 124}
 125