kernel/arch/unicore32/kernel/puv3-nb0916.c

   1 /*
   2  * linux/arch/unicore32/kernel/puv3-nb0916.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
  14 #include <linux/init.h>
  15 #include <linux/device.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/mtd/physmap.h>
  18 #include <linux/io.h>
  19 #include <linux/reboot.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/i2c.h>
  22 #include <linux/pwm.h>
  23 #include <linux/pwm_backlight.h>
  24 #include <linux/gpio.h>
  25 #include <linux/gpio_keys.h>
  26 #include <linux/input.h>
  27
  28 #include <mach/hardware.h>
  29
  30 static struct physmap_flash_data physmap_flash_data = {
  31         .width          = 1,
  32 };
  33
  34 static struct resource physmap_flash_resource = {
  35         .start          = 0xFFF80000,
  36         .end            = 0xFFFFFFFF,
  37         .flags          = IORESOURCE_MEM,
  38 };
  39
  40 static struct resource puv3_i2c_resources[] = {
  41         [0] = {
  42                 .start = io_v2p(PKUNITY_I2C_BASE),
  43                 .end   = io_v2p(PKUNITY_I2C_BASE) + 0xff,
  44                 .flags = IORESOURCE_MEM,
  45         },
  46         [1] = {
  47                 .start = IRQ_I2C,
  48                 .end   = IRQ_I2C,
  49                 .flags = IORESOURCE_IRQ,
  50         }
  51 };
  52
  53 static struct pwm_lookup nb0916_pwm_lookup[] = {
  54         PWM_LOOKUP("PKUnity-v3-PWM", 0, "pwm-backlight", NULL, 70 * 1024,
  55                    PWM_POLARITY_NORMAL),
  56 };
  57
  58 static struct platform_pwm_backlight_data nb0916_backlight_data = {
  59         .max_brightness = 100,
  60         .dft_brightness = 100,
  61         .enable_gpio    = -1,
  62 };
  63
  64 static struct gpio_keys_button nb0916_gpio_keys[] = {
  65         {
  66                 .type   = EV_KEY,
  67                 .code   = KEY_POWER,
  68                 .gpio   = GPI_SOFF_REQ,
  69                 .desc   = "Power Button",
  70                 .wakeup = 1,
  71                 .active_low = 1,
  72         },
  73         {
  74                 .type   = EV_KEY,
  75                 .code   = BTN_TOUCH,
  76                 .gpio   = GPI_BTN_TOUCH,
  77                 .desc   = "Touchpad Button",
  78                 .wakeup = 1,
  79                 .active_low = 1,
  80         },
  81 };
  82
  83 static struct gpio_keys_platform_data nb0916_gpio_button_data = {
  84         .buttons        = nb0916_gpio_keys,
  85         .nbuttons       = ARRAY_SIZE(nb0916_gpio_keys),
  86 };
  87
  88 static irqreturn_t nb0916_lcdcaseoff_handler(int irq, void *dev_id)
  89 {
  90         if (gpio_get_value(GPI_LCD_CASE_OFF))
  91                 gpio_set_value(GPO_LCD_EN, 1);
  92         else
  93                 gpio_set_value(GPO_LCD_EN, 0);
  94
  95         return IRQ_HANDLED;
  96 }
  97
  98 static irqreturn_t nb0916_overheat_handler(int irq, void *dev_id)
  99 {
 100         machine_halt();
 101         /* SYSTEM HALT, NO RETURN */
 102         return IRQ_HANDLED;
 103 }
 104
 105 static struct i2c_board_info __initdata puv3_i2c_devices[] = {
 106         {       I2C_BOARD_INFO("lm75",          I2C_TAR_THERMAL),       },
 107         {       I2C_BOARD_INFO("bq27200",       I2C_TAR_PWIC),          },
 108         {       I2C_BOARD_INFO("24c02",         I2C_TAR_EEPROM),        },
 109 };
 110
 111 int __init mach_nb0916_init(void)
 112 {
 113         i2c_register_board_info(0, puv3_i2c_devices,
 114                         ARRAY_SIZE(puv3_i2c_devices));
 115
 116         platform_device_register_simple("PKUnity-v3-I2C", -1,
 117                         puv3_i2c_resources, ARRAY_SIZE(puv3_i2c_resources));
 118
 119         pwm_add_table(nb0916_pwm_lookup, ARRAY_SIZE(nb0916_pwm_lookup));
 120
 121         platform_device_register_data(NULL, "pwm-backlight", -1,
 122                         &nb0916_backlight_data, sizeof(nb0916_backlight_data));
 123
 124         platform_device_register_data(NULL, "gpio-keys", -1,
 125                         &nb0916_gpio_button_data, sizeof(nb0916_gpio_button_data));
 126
 127         platform_device_register_resndata(NULL, "physmap-flash", -1,
 128                         &physmap_flash_resource, 1,
 129                         &physmap_flash_data, sizeof(physmap_flash_data));
 130
 131         if (request_irq(gpio_to_irq(GPI_LCD_CASE_OFF),
 132                 &nb0916_lcdcaseoff_handler,
 133                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 134                 "NB0916 lcd case off", NULL) < 0) {
 135
 136                 printk(KERN_DEBUG "LCD-Case-OFF IRQ %d not available\n",
 137                         gpio_to_irq(GPI_LCD_CASE_OFF));
 138         }
 139
 140         if (request_irq(gpio_to_irq(GPI_OTP_INT), &nb0916_overheat_handler,
 141                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 142                 "NB0916 overheating protection", NULL) < 0) {
 143
 144                 printk(KERN_DEBUG "Overheating Protection IRQ %d not available\n",
 145                         gpio_to_irq(GPI_OTP_INT));
 146         }
 147
 148         return 0;
 149 }
 150
 151 subsys_initcall_sync(mach_nb0916_init);