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 | |
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 | |
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(lock: &bcm63xx_gpio_lock, flags); |
65 | } |
66 | |
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 | |
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(lock: &bcm63xx_gpio_lock, flags); |
111 | |
112 | return 0; |
113 | } |
114 | |
115 | static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) |
116 | { |
117 | return bcm63xx_gpio_set_direction(chip, gpio, dir: BCM63XX_GPIO_DIR_IN); |
118 | } |
119 | |
120 | static int bcm63xx_gpio_direction_output(struct gpio_chip *chip, |
121 | unsigned gpio, int value) |
122 | { |
123 | bcm63xx_gpio_set(chip, gpio, val: value); |
124 | return bcm63xx_gpio_set_direction(chip, gpio, dir: 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 | |
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 | |