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e7300d04 MB |
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> | |
92d9ae20 | 7 | * Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org> |
e7300d04 MB |
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 | ||
92d9ae20 FF |
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 | } | |
92d9ae20 | 34 | |
e7300d04 MB |
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 | if (gpio >= chip->ngpio) | |
47 | BUG(); | |
48 | ||
49 | if (gpio < 32) { | |
92d9ae20 | 50 | reg = gpio_out_low_reg; |
e7300d04 MB |
51 | mask = 1 << gpio; |
52 | v = &gpio_out_low; | |
53 | } else { | |
54 | reg = GPIO_DATA_HI_REG; | |
55 | mask = 1 << (gpio - 32); | |
56 | v = &gpio_out_high; | |
57 | } | |
58 | ||
59 | spin_lock_irqsave(&bcm63xx_gpio_lock, flags); | |
60 | if (val) | |
61 | *v |= mask; | |
62 | else | |
63 | *v &= ~mask; | |
64 | bcm_gpio_writel(*v, reg); | |
65 | spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); | |
66 | } | |
67 | ||
68 | static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio) | |
69 | { | |
70 | u32 reg; | |
71 | u32 mask; | |
72 | ||
73 | if (gpio >= chip->ngpio) | |
74 | BUG(); | |
75 | ||
76 | if (gpio < 32) { | |
92d9ae20 | 77 | reg = gpio_out_low_reg; |
e7300d04 MB |
78 | mask = 1 << gpio; |
79 | } else { | |
80 | reg = GPIO_DATA_HI_REG; | |
81 | mask = 1 << (gpio - 32); | |
82 | } | |
83 | ||
84 | return !!(bcm_gpio_readl(reg) & mask); | |
85 | } | |
86 | ||
87 | static int bcm63xx_gpio_set_direction(struct gpio_chip *chip, | |
88 | unsigned gpio, int dir) | |
89 | { | |
90 | u32 reg; | |
91 | u32 mask; | |
92 | u32 tmp; | |
93 | unsigned long flags; | |
94 | ||
95 | if (gpio >= chip->ngpio) | |
96 | BUG(); | |
97 | ||
98 | if (gpio < 32) { | |
99 | reg = GPIO_CTL_LO_REG; | |
100 | mask = 1 << gpio; | |
101 | } else { | |
102 | reg = GPIO_CTL_HI_REG; | |
103 | mask = 1 << (gpio - 32); | |
104 | } | |
105 | ||
106 | spin_lock_irqsave(&bcm63xx_gpio_lock, flags); | |
107 | tmp = bcm_gpio_readl(reg); | |
3e1bf29f | 108 | if (dir == BCM63XX_GPIO_DIR_IN) |
e7300d04 MB |
109 | tmp &= ~mask; |
110 | else | |
111 | tmp |= mask; | |
112 | bcm_gpio_writel(tmp, reg); | |
113 | spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) | |
119 | { | |
3e1bf29f | 120 | return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN); |
e7300d04 MB |
121 | } |
122 | ||
123 | static int bcm63xx_gpio_direction_output(struct gpio_chip *chip, | |
124 | unsigned gpio, int value) | |
125 | { | |
126 | bcm63xx_gpio_set(chip, gpio, value); | |
3e1bf29f | 127 | return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT); |
e7300d04 MB |
128 | } |
129 | ||
130 | ||
131 | static struct gpio_chip bcm63xx_gpio_chip = { | |
132 | .label = "bcm63xx-gpio", | |
133 | .direction_input = bcm63xx_gpio_direction_input, | |
134 | .direction_output = bcm63xx_gpio_direction_output, | |
135 | .get = bcm63xx_gpio_get, | |
136 | .set = bcm63xx_gpio_set, | |
137 | .base = 0, | |
138 | }; | |
139 | ||
140 | int __init bcm63xx_gpio_init(void) | |
141 | { | |
92d9ae20 FF |
142 | bcm63xx_gpio_out_low_reg_init(); |
143 | ||
144 | gpio_out_low = bcm_gpio_readl(gpio_out_low_reg); | |
145 | if (!BCMCPU_IS_6345()) | |
146 | gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG); | |
e7300d04 MB |
147 | bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count(); |
148 | pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio); | |
149 | ||
150 | return gpiochip_add(&bcm63xx_gpio_chip); | |
151 | } |