arch/unicore32/kernel/puv3-nb0916.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/unicore32/kernel/puv3-nb0916.c
   4  *
   5  * Code specific to PKUnity SoC and UniCore ISA
   6  *
   7  *      Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
   8  *      Copyright (C) 2001-2010 Guan Xuetao
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/mtd/physmap.h>
  15 #include <linux/io.h>
  16 #include <linux/reboot.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/i2c.h>
  19 #include <linux/pwm.h>
  20 #include <linux/pwm_backlight.h>
  21 #include <linux/gpio.h>
  22 #include <linux/gpio_keys.h>
  23 #include <linux/input.h>
  24
  25 #include <mach/hardware.h>
  26
  27 static struct physmap_flash_data physmap_flash_data = {
  28         .width          = 1,
  29 };
  30
  31 static struct resource physmap_flash_resource = {
  32         .start          = 0xFFF80000,
  33         .end            = 0xFFFFFFFF,
  34         .flags          = IORESOURCE_MEM,
  35 };
  36
  37 static struct resource puv3_i2c_resources[] = {
  38         [0] = {
  39                 .start = io_v2p(PKUNITY_I2C_BASE),
  40                 .end   = io_v2p(PKUNITY_I2C_BASE) + 0xff,
  41                 .flags = IORESOURCE_MEM,
  42         },
  43         [1] = {
  44                 .start = IRQ_I2C,
  45                 .end   = IRQ_I2C,
  46                 .flags = IORESOURCE_IRQ,
  47         }
  48 };
  49
  50 static struct pwm_lookup nb0916_pwm_lookup[] = {
  51         PWM_LOOKUP("PKUnity-v3-PWM", 0, "pwm-backlight", NULL, 70 * 1024,
  52                    PWM_POLARITY_NORMAL),
  53 };
  54
  55 static struct platform_pwm_backlight_data nb0916_backlight_data = {
  56         .max_brightness = 100,
  57         .dft_brightness = 100,
  58 };
  59
  60 static struct gpio_keys_button nb0916_gpio_keys[] = {
  61         {
  62                 .type   = EV_KEY,
  63                 .code   = KEY_POWER,
  64                 .gpio   = GPI_SOFF_REQ,
  65                 .desc   = "Power Button",
  66                 .wakeup = 1,
  67                 .active_low = 1,
  68         },
  69         {
  70                 .type   = EV_KEY,
  71                 .code   = BTN_TOUCH,
  72                 .gpio   = GPI_BTN_TOUCH,
  73                 .desc   = "Touchpad Button",
  74                 .wakeup = 1,
  75                 .active_low = 1,
  76         },
  77 };
  78
  79 static struct gpio_keys_platform_data nb0916_gpio_button_data = {
  80         .buttons        = nb0916_gpio_keys,
  81         .nbuttons       = ARRAY_SIZE(nb0916_gpio_keys),
  82 };
  83
  84 static irqreturn_t nb0916_lcdcaseoff_handler(int irq, void *dev_id)
  85 {
  86         if (gpio_get_value(GPI_LCD_CASE_OFF))
  87                 gpio_set_value(GPO_LCD_EN, 1);
  88         else
  89                 gpio_set_value(GPO_LCD_EN, 0);
  90
  91         return IRQ_HANDLED;
  92 }
  93
  94 static irqreturn_t nb0916_overheat_handler(int irq, void *dev_id)
  95 {
  96         machine_halt();
  97         /* SYSTEM HALT, NO RETURN */
  98         return IRQ_HANDLED;
  99 }
 100
 101 static struct i2c_board_info __initdata puv3_i2c_devices[] = {
 102         {       I2C_BOARD_INFO("lm75",          I2C_TAR_THERMAL),       },
 103         {       I2C_BOARD_INFO("bq27200",       I2C_TAR_PWIC),          },
 104         {       I2C_BOARD_INFO("24c02",         I2C_TAR_EEPROM),        },
 105 };
 106
 107 int __init mach_nb0916_init(void)
 108 {
 109         i2c_register_board_info(0, puv3_i2c_devices,
 110                         ARRAY_SIZE(puv3_i2c_devices));
 111
 112         platform_device_register_simple("PKUnity-v3-I2C", -1,
 113                         puv3_i2c_resources, ARRAY_SIZE(puv3_i2c_resources));
 114
 115         pwm_add_table(nb0916_pwm_lookup, ARRAY_SIZE(nb0916_pwm_lookup));
 116
 117         platform_device_register_data(NULL, "pwm-backlight", -1,
 118                         &nb0916_backlight_data, sizeof(nb0916_backlight_data));
 119
 120         platform_device_register_data(NULL, "gpio-keys", -1,
 121                         &nb0916_gpio_button_data, sizeof(nb0916_gpio_button_data));
 122
 123         platform_device_register_resndata(NULL, "physmap-flash", -1,
 124                         &physmap_flash_resource, 1,
 125                         &physmap_flash_data, sizeof(physmap_flash_data));
 126
 127         if (request_irq(gpio_to_irq(GPI_LCD_CASE_OFF),
 128                 &nb0916_lcdcaseoff_handler,
 129                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 130                 "NB0916 lcd case off", NULL) < 0) {
 131
 132                 printk(KERN_DEBUG "LCD-Case-OFF IRQ %d not available\n",
 133                         gpio_to_irq(GPI_LCD_CASE_OFF));
 134         }
 135
 136         if (request_irq(gpio_to_irq(GPI_OTP_INT), &nb0916_overheat_handler,
 137                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 138                 "NB0916 overheating protection", NULL) < 0) {
 139
 140                 printk(KERN_DEBUG "Overheating Protection IRQ %d not available\n",
 141                         gpio_to_irq(GPI_OTP_INT));
 142         }
 143
 144         return 0;
 145 }
 146
 147 subsys_initcall_sync(mach_nb0916_init);