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
  26 static 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
  33 static 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
  38 static 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
  46 static int __init puv3_gpio_leds_init(void)
  47 {
  48         platform_device_register(&puv3_gpio_gpio_leds);
  49         return 0;
  50 }
  51
  52 device_initcall(puv3_gpio_leds_init);
  53 #endif
  54
  55 static int puv3_gpio_get(struct gpio_chip *chip, unsigned offset)
  56 {
  57         return !!(readl(GPIO_GPLR) & GPIO_GPIO(offset));
  58 }
  59
  60 static 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
  68 static 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
  78 static 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
  90 static 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
 100 void __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 }