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
nb0916_lcdcaseoff_handler(int irq,void * dev_id)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
nb0916_overheat_handler(int irq,void * dev_id)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
mach_nb0916_init(void)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);
152
