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) 2008-2011 Florian Fainelli <florian@openwrt.org>
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/spinlock.h>
13 #include <linux/platform_device.h>
14 #include <linux/gpio/driver.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 u32 gpio_out_low_reg;
22
bcm63xx_gpio_out_low_reg_init(void)23 static void bcm63xx_gpio_out_low_reg_init(void)
24 {
25 switch (bcm63xx_get_cpu_id()) {
26 case BCM6345_CPU_ID:
27 gpio_out_low_reg = GPIO_DATA_LO_REG_6345;
28 break;
29 default:
30 gpio_out_low_reg = GPIO_DATA_LO_REG;
31 break;
32 }
33 }
34
35 static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
36 static u32 gpio_out_low, gpio_out_high;
37
bcm63xx_gpio_set(struct gpio_chip * chip,unsigned int gpio,int val)38 static int bcm63xx_gpio_set(struct gpio_chip *chip, unsigned int gpio, int val)
39 {
40 u32 reg;
41 u32 mask;
42 u32 *v;
43 unsigned long flags;
44
45 BUG_ON(gpio >= chip->ngpio);
46
47 if (gpio < 32) {
48 reg = gpio_out_low_reg;
49 mask = 1 << gpio;
50 v = &gpio_out_low;
51 } else {
52 reg = GPIO_DATA_HI_REG;
53 mask = 1 << (gpio - 32);
54 v = &gpio_out_high;
55 }
56
57 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
58 if (val)
59 *v |= mask;
60 else
61 *v &= ~mask;
62 bcm_gpio_writel(*v, reg);
63 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
64
65 return 0;
66 }
67
bcm63xx_gpio_get(struct gpio_chip * chip,unsigned gpio)68 static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
69 {
70 u32 reg;
71 u32 mask;
72
73 BUG_ON(gpio >= chip->ngpio);
74
75 if (gpio < 32) {
76 reg = gpio_out_low_reg;
77 mask = 1 << gpio;
78 } else {
79 reg = GPIO_DATA_HI_REG;
80 mask = 1 << (gpio - 32);
81 }
82
83 return !!(bcm_gpio_readl(reg) & mask);
84 }
85
bcm63xx_gpio_set_direction(struct gpio_chip * chip,unsigned gpio,int dir)86 static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
87 unsigned gpio, int dir)
88 {
89 u32 reg;
90 u32 mask;
91 u32 tmp;
92 unsigned long flags;
93
94 BUG_ON(gpio >= chip->ngpio);
95
96 if (gpio < 32) {
97 reg = GPIO_CTL_LO_REG;
98 mask = 1 << gpio;
99 } else {
100 reg = GPIO_CTL_HI_REG;
101 mask = 1 << (gpio - 32);
102 }
103
104 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
105 tmp = bcm_gpio_readl(reg);
106 if (dir == BCM63XX_GPIO_DIR_IN)
107 tmp &= ~mask;
108 else
109 tmp |= mask;
110 bcm_gpio_writel(tmp, reg);
111 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
112
113 return 0;
114 }
115
bcm63xx_gpio_direction_input(struct gpio_chip * chip,unsigned gpio)116 static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
117 {
118 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN);
119 }
120
bcm63xx_gpio_direction_output(struct gpio_chip * chip,unsigned gpio,int value)121 static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
122 unsigned gpio, int value)
123 {
124 bcm63xx_gpio_set(chip, gpio, value);
125 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT);
126 }
127
128
129 static struct gpio_chip bcm63xx_gpio_chip = {
130 .label = "bcm63xx-gpio",
131 .direction_input = bcm63xx_gpio_direction_input,
132 .direction_output = bcm63xx_gpio_direction_output,
133 .get = bcm63xx_gpio_get,
134 .set_rv = bcm63xx_gpio_set,
135 .base = 0,
136 };
137
bcm63xx_gpio_init(void)138 int __init bcm63xx_gpio_init(void)
139 {
140 bcm63xx_gpio_out_low_reg_init();
141
142 gpio_out_low = bcm_gpio_readl(gpio_out_low_reg);
143 if (!BCMCPU_IS_6345())
144 gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
145 bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
146 pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);
147
148 return gpiochip_add_data(&bcm63xx_gpio_chip, NULL);
149 }
150