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review.evervolv.com / android_kernel_htc_msm8960 / eda2e5dcc914b4d70f665443efc9780e89a5e5c1 / . / arch / mips / bcm63xx / gpio.c
blob: f560fe7d38ddafd0920f3afbea58ffb91683dcc5 [file] [log] [blame]
Maxime Bizone7300d02009-08-18 13:23:37 +0100[diff] [blame]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
21static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
22static u32 gpio_out_low, gpio_out_high;
23
24static void bcm63xx_gpio_set(struct gpio_chip *chip,
25 unsigned gpio, int val)
26{
27 u32 reg;
28 u32 mask;
29 u32 *v;
30 unsigned long flags;
31
32 if (gpio >= chip->ngpio)
33 BUG();
34
35 if (gpio < 32) {
36 reg = GPIO_DATA_LO_REG;
37 mask = 1 << gpio;
38 v = &gpio_out_low;
39 } else {
40 reg = GPIO_DATA_HI_REG;
41 mask = 1 << (gpio - 32);
42 v = &gpio_out_high;
43 }
44
45 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
46 if (val)
47 *v |= mask;
48 else
49 *v &= ~mask;
50 bcm_gpio_writel(*v, reg);
51 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
52}
53
54static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
55{
56 u32 reg;
57 u32 mask;
58
59 if (gpio >= chip->ngpio)
60 BUG();
61
62 if (gpio < 32) {
63 reg = GPIO_DATA_LO_REG;
64 mask = 1 << gpio;
65 } else {
66 reg = GPIO_DATA_HI_REG;
67 mask = 1 << (gpio - 32);
68 }
69
70 return !!(bcm_gpio_readl(reg) & mask);
71}
72
73static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
74 unsigned gpio, int dir)
75{
76 u32 reg;
77 u32 mask;
78 u32 tmp;
79 unsigned long flags;
80
81 if (gpio >= chip->ngpio)
82 BUG();
83
84 if (gpio < 32) {
85 reg = GPIO_CTL_LO_REG;
86 mask = 1 << gpio;
87 } else {
88 reg = GPIO_CTL_HI_REG;
89 mask = 1 << (gpio - 32);
90 }
91
92 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
93 tmp = bcm_gpio_readl(reg);
Florian Fainelli3e1bf292010-05-04 10:38:57 +0200[diff] [blame]94 if (dir == BCM63XX_GPIO_DIR_IN)
Maxime Bizone7300d02009-08-18 13:23:37 +0100[diff] [blame]95 tmp &= ~mask;
96 else
97 tmp |= mask;
98 bcm_gpio_writel(tmp, reg);
99 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
100
101 return 0;
102}
103
104static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
105{
Florian Fainelli3e1bf292010-05-04 10:38:57 +0200[diff] [blame]106 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN);
Maxime Bizone7300d02009-08-18 13:23:37 +0100[diff] [blame]107}
108
109static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
110 unsigned gpio, int value)
111{
112 bcm63xx_gpio_set(chip, gpio, value);
Florian Fainelli3e1bf292010-05-04 10:38:57 +0200[diff] [blame]113 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT);
Maxime Bizone7300d02009-08-18 13:23:37 +0100[diff] [blame]114}
115
116
117static struct gpio_chip bcm63xx_gpio_chip = {
118 .label = "bcm63xx-gpio",
119 .direction_input = bcm63xx_gpio_direction_input,
120 .direction_output = bcm63xx_gpio_direction_output,
121 .get = bcm63xx_gpio_get,
122 .set = bcm63xx_gpio_set,
123 .base = 0,
124};
125
126int __init bcm63xx_gpio_init(void)
127{
Maxime Bizon9538ca62010-01-30 18:34:58 +0100[diff] [blame]128 gpio_out_low = bcm_gpio_readl(GPIO_DATA_LO_REG);
129 gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
Maxime Bizone7300d02009-08-18 13:23:37 +0100[diff] [blame]130 bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
131 pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);
132
133 return gpiochip_add(&bcm63xx_gpio_chip);
134}