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.h>
  18 #include <mach/hardware.h>
  19
  20 #ifdef CONFIG_LEDS
  21 #include <linux/leds.h>
  22 #include <linux/platform_device.h>
  23
  24 static const struct gpio_led puv3_gpio_leds[] = {
  25         { .name = "cpuhealth", .gpio = GPO_CPU_HEALTH, .active_low = 0,
  26                 .default_trigger = "heartbeat", },
  27         { .name = "hdd_led", .gpio = GPO_HDD_LED, .active_low = 1,
  28                 .default_trigger = "ide-disk", },
  29 };
  30
  31 static const struct gpio_led_platform_data puv3_gpio_led_data = {
  32         .num_leds =     ARRAY_SIZE(puv3_gpio_leds),
  33         .leds =         (void *) puv3_gpio_leds,
  34 };
  35
  36 static struct platform_device puv3_gpio_gpio_leds = {
  37         .name =         "leds-gpio",
  38         .id =           -1,
  39         .dev = {
  40                 .platform_data = (void *) &puv3_gpio_led_data,
  41         }
  42 };
  43
  44 static int __init puv3_gpio_leds_init(void)
  45 {
  46         platform_device_register(&puv3_gpio_gpio_leds);
  47         return 0;
  48 }
  49
  50 device_initcall(puv3_gpio_leds_init);
  51 #endif
  52
  53 static int puv3_gpio_get(struct gpio_chip *chip, unsigned offset)
  54 {
  55         return readl(GPIO_GPLR) & GPIO_GPIO(offset);
  56 }
  57
  58 static void puv3_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
  59 {
  60         if (value)
  61                 writel(GPIO_GPIO(offset), GPIO_GPSR);
  62         else
  63                 writel(GPIO_GPIO(offset), GPIO_GPCR);
  64 }
  65
  66 static int puv3_direction_input(struct gpio_chip *chip, unsigned offset)
  67 {
  68         unsigned long flags;
  69
  70         local_irq_save(flags);
  71         writel(readl(GPIO_GPDR) & ~GPIO_GPIO(offset), GPIO_GPDR);
  72         local_irq_restore(flags);
  73         return 0;
  74 }
  75
  76 static int puv3_direction_output(struct gpio_chip *chip, unsigned offset,
  77                 int value)
  78 {
  79         unsigned long flags;
  80
  81         local_irq_save(flags);
  82         puv3_gpio_set(chip, offset, value);
  83         writel(readl(GPIO_GPDR) | GPIO_GPIO(offset), GPIO_GPDR);
  84         local_irq_restore(flags);
  85         return 0;
  86 }
  87
  88 static struct gpio_chip puv3_gpio_chip = {
  89         .label                  = "gpio",
  90         .direction_input        = puv3_direction_input,
  91         .direction_output       = puv3_direction_output,
  92         .set                    = puv3_gpio_set,
  93         .get                    = puv3_gpio_get,
  94         .base                   = 0,
  95         .ngpio                  = GPIO_MAX + 1,
  96 };
  97
  98 void __init puv3_init_gpio(void)
  99 {
 100         writel(GPIO_DIR, GPIO_GPDR);
 101 #if     defined(CONFIG_PUV3_NB0916) || defined(CONFIG_PUV3_SMW0919)     \
 102         || defined(CONFIG_PUV3_DB0913)
 103         gpio_set_value(GPO_WIFI_EN, 1);
 104         gpio_set_value(GPO_HDD_LED, 1);
 105         gpio_set_value(GPO_VGA_EN, 1);
 106         gpio_set_value(GPO_LCD_EN, 1);
 107         gpio_set_value(GPO_CAM_PWR_EN, 0);
 108         gpio_set_value(GPO_LCD_VCC_EN, 1);
 109         gpio_set_value(GPO_SOFT_OFF, 1);
 110         gpio_set_value(GPO_BT_EN, 1);
 111         gpio_set_value(GPO_FAN_ON, 0);
 112         gpio_set_value(GPO_SPKR, 0);
 113         gpio_set_value(GPO_CPU_HEALTH, 1);
 114         gpio_set_value(GPO_LAN_SEL, 1);
 115 /*
 116  * DO NOT modify the GPO_SET_V1 and GPO_SET_V2 in kernel
 117  *      gpio_set_value(GPO_SET_V1, 1);
 118  *      gpio_set_value(GPO_SET_V2, 1);
 119  */
 120 #endif
 121         gpiochip_add(&puv3_gpio_chip);
 122 }