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 gpio,int val)38 static void bcm63xx_gpio_set(struct gpio_chip *chip,
39 unsigned gpio, int val)
40 {
41 u32 reg;
42 u32 mask;
43 u32 *v;
44 unsigned long flags;
45
46 BUG_ON(gpio >= chip->ngpio);
47
48 if (gpio < 32) {
49 reg = gpio_out_low_reg;
50 mask = 1 << gpio;
51 v = &gpio_out_low;
52 } else {
53 reg = GPIO_DATA_HI_REG;
54 mask = 1 << (gpio - 32);
55 v = &gpio_out_high;
56 }
57
58 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
59 if (val)
60 *v |= mask;
61 else
62 *v &= ~mask;
63 bcm_gpio_writel(*v, reg);
64 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
65 }
66
bcm63xx_gpio_get(struct gpio_chip * chip,unsigned gpio)67 static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
68 {
69 u32 reg;
70 u32 mask;
71
72 BUG_ON(gpio >= chip->ngpio);
73
74 if (gpio < 32) {
75 reg = gpio_out_low_reg;
76 mask = 1 << gpio;
77 } else {
78 reg = GPIO_DATA_HI_REG;
79 mask = 1 << (gpio - 32);
80 }
81
82 return !!(bcm_gpio_readl(reg) & mask);
83 }
84
bcm63xx_gpio_set_direction(struct gpio_chip * chip,unsigned gpio,int dir)85 static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
86 unsigned gpio, int dir)
87 {
88 u32 reg;
89 u32 mask;
90 u32 tmp;
91 unsigned long flags;
92
93 BUG_ON(gpio >= chip->ngpio);
94
95 if (gpio < 32) {
96 reg = GPIO_CTL_LO_REG;
97 mask = 1 << gpio;
98 } else {
99 reg = GPIO_CTL_HI_REG;
100 mask = 1 << (gpio - 32);
101 }
102
103 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
104 tmp = bcm_gpio_readl(reg);
105 if (dir == BCM63XX_GPIO_DIR_IN)
106 tmp &= ~mask;
107 else
108 tmp |= mask;
109 bcm_gpio_writel(tmp, reg);
110 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
111
112 return 0;
113 }
114
bcm63xx_gpio_direction_input(struct gpio_chip * chip,unsigned gpio)115 static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
116 {
117 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN);
118 }
119
bcm63xx_gpio_direction_output(struct gpio_chip * chip,unsigned gpio,int value)120 static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
121 unsigned gpio, int value)
122 {
123 bcm63xx_gpio_set(chip, gpio, value);
124 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT);
125 }
126
127
128 static struct gpio_chip bcm63xx_gpio_chip = {
129 .label = "bcm63xx-gpio",
130 .direction_input = bcm63xx_gpio_direction_input,
131 .direction_output = bcm63xx_gpio_direction_output,
132 .get = bcm63xx_gpio_get,
133 .set = bcm63xx_gpio_set,
134 .base = 0,
135 };
136
bcm63xx_gpio_init(void)137 int __init bcm63xx_gpio_init(void)
138 {
139 bcm63xx_gpio_out_low_reg_init();
140
141 gpio_out_low = bcm_gpio_readl(gpio_out_low_reg);
142 if (!BCMCPU_IS_6345())
143 gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
144 bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
145 pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);
146
147 return gpiochip_add_data(&bcm63xx_gpio_chip, NULL);
148 }
149