[brcm63xx] register gpiochip earlier, allowing gpio-based runtime detection to be...
[openwrt/svn-archive/archive.git] / target / linux / brcm63xx / files / arch / mips / bcm63xx / gpio.c
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
7 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/spinlock.h>
13 #include <linux/platform_device.h>
14 #include <linux/gpio.h>
15
16 #include <bcm63xx_cpu.h>
17 #include <bcm63xx_gpio.h>
18 #include <bcm63xx_io.h>
19 #include <bcm63xx_regs.h>
20
21 static void bcm63xx_gpio_set(struct gpio_chip *chip,
22 unsigned gpio, int val)
23 {
24 u32 reg;
25 u32 mask;
26 u32 tmp;
27 unsigned long flags;
28
29 if (gpio >= chip->ngpio)
30 BUG();
31
32 if (gpio < 32) {
33 reg = GPIO_DATA_LO_REG;
34 mask = 1 << gpio;
35 } else {
36 reg = GPIO_DATA_HI_REG;
37 mask = 1 << (gpio - 32);
38 }
39
40 local_irq_save(flags);
41 tmp = bcm_gpio_readl(reg);
42 if (val)
43 tmp |= mask;
44 else
45 tmp &= ~mask;
46 bcm_gpio_writel(tmp, reg);
47 local_irq_restore(flags);
48 }
49
50 static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
51 {
52 u32 reg;
53 u32 mask;
54
55 if (gpio >= chip->ngpio)
56 BUG();
57
58 if (gpio < 32) {
59 reg = GPIO_DATA_LO_REG;
60 mask = 1 << gpio;
61 } else {
62 reg = GPIO_DATA_HI_REG;
63 mask = 1 << (gpio - 32);
64 }
65
66 return !!(bcm_gpio_readl(reg) & mask);
67 }
68
69 static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
70 unsigned gpio, int dir)
71 {
72 u32 reg;
73 u32 mask;
74 u32 tmp;
75 unsigned long flags;
76
77 if (gpio >= chip->ngpio)
78 BUG();
79
80 if (gpio < 32) {
81 reg = GPIO_CTL_LO_REG;
82 mask = 1 << gpio;
83 } else {
84 reg = GPIO_CTL_HI_REG;
85 mask = 1 << (gpio - 32);
86 }
87
88 local_irq_save(flags);
89 tmp = bcm_gpio_readl(reg);
90 if (dir == GPIO_DIR_IN)
91 tmp &= ~mask;
92 else
93 tmp |= mask;
94 bcm_gpio_writel(tmp, reg);
95 local_irq_restore(flags);
96
97 return 0;
98 }
99
100 static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
101 {
102 return bcm63xx_gpio_set_direction(chip, gpio, GPIO_DIR_IN);
103 }
104
105 static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
106 unsigned gpio, int value)
107 {
108 bcm63xx_gpio_set(chip, gpio, value);
109 return bcm63xx_gpio_set_direction(chip, gpio, GPIO_DIR_OUT);
110 }
111
112
113 static struct gpio_chip bcm63xx_gpio_chip = {
114 .label = "bcm63xx-gpio",
115 .direction_input = bcm63xx_gpio_direction_input,
116 .direction_output = bcm63xx_gpio_direction_output,
117 .get = bcm63xx_gpio_get,
118 .set = bcm63xx_gpio_set,
119 .base = 0,
120 .ngpio = BCM63XX_GPIO_COUNT,
121 };
122
123 int __init bcm63xx_gpio_init(void)
124 {
125 printk(KERN_INFO "registering %d GPIOs\n", BCM63XX_GPIO_COUNT);
126 return gpiochip_add(&bcm63xx_gpio_chip);
127 }