Loading...
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
21static u32 gpio_out_low_reg;
22
23static 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
35static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
36static u32 gpio_out_low, gpio_out_high;
37
38static 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
67static 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
85static 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
115static 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
120static 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
128static 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
137int __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}
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/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
21#ifndef BCMCPU_RUNTIME_DETECT
22#define gpio_out_low_reg GPIO_DATA_LO_REG
23#ifdef CONFIG_BCM63XX_CPU_6345
24#ifdef gpio_out_low_reg
25#undef gpio_out_low_reg
26#define gpio_out_low_reg GPIO_DATA_LO_REG_6345
27#endif /* gpio_out_low_reg */
28#endif /* CONFIG_BCM63XX_CPU_6345 */
29
30static inline void bcm63xx_gpio_out_low_reg_init(void)
31{
32}
33#else /* ! BCMCPU_RUNTIME_DETECT */
34static u32 gpio_out_low_reg;
35
36static void bcm63xx_gpio_out_low_reg_init(void)
37{
38 switch (bcm63xx_get_cpu_id()) {
39 case BCM6345_CPU_ID:
40 gpio_out_low_reg = GPIO_DATA_LO_REG_6345;
41 break;
42 default:
43 gpio_out_low_reg = GPIO_DATA_LO_REG;
44 break;
45 }
46}
47#endif /* ! BCMCPU_RUNTIME_DETECT */
48
49static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
50static u32 gpio_out_low, gpio_out_high;
51
52static void bcm63xx_gpio_set(struct gpio_chip *chip,
53 unsigned gpio, int val)
54{
55 u32 reg;
56 u32 mask;
57 u32 *v;
58 unsigned long flags;
59
60 if (gpio >= chip->ngpio)
61 BUG();
62
63 if (gpio < 32) {
64 reg = gpio_out_low_reg;
65 mask = 1 << gpio;
66 v = &gpio_out_low;
67 } else {
68 reg = GPIO_DATA_HI_REG;
69 mask = 1 << (gpio - 32);
70 v = &gpio_out_high;
71 }
72
73 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
74 if (val)
75 *v |= mask;
76 else
77 *v &= ~mask;
78 bcm_gpio_writel(*v, reg);
79 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
80}
81
82static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
83{
84 u32 reg;
85 u32 mask;
86
87 if (gpio >= chip->ngpio)
88 BUG();
89
90 if (gpio < 32) {
91 reg = gpio_out_low_reg;
92 mask = 1 << gpio;
93 } else {
94 reg = GPIO_DATA_HI_REG;
95 mask = 1 << (gpio - 32);
96 }
97
98 return !!(bcm_gpio_readl(reg) & mask);
99}
100
101static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
102 unsigned gpio, int dir)
103{
104 u32 reg;
105 u32 mask;
106 u32 tmp;
107 unsigned long flags;
108
109 if (gpio >= chip->ngpio)
110 BUG();
111
112 if (gpio < 32) {
113 reg = GPIO_CTL_LO_REG;
114 mask = 1 << gpio;
115 } else {
116 reg = GPIO_CTL_HI_REG;
117 mask = 1 << (gpio - 32);
118 }
119
120 spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
121 tmp = bcm_gpio_readl(reg);
122 if (dir == BCM63XX_GPIO_DIR_IN)
123 tmp &= ~mask;
124 else
125 tmp |= mask;
126 bcm_gpio_writel(tmp, reg);
127 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
128
129 return 0;
130}
131
132static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
133{
134 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN);
135}
136
137static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
138 unsigned gpio, int value)
139{
140 bcm63xx_gpio_set(chip, gpio, value);
141 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT);
142}
143
144
145static struct gpio_chip bcm63xx_gpio_chip = {
146 .label = "bcm63xx-gpio",
147 .direction_input = bcm63xx_gpio_direction_input,
148 .direction_output = bcm63xx_gpio_direction_output,
149 .get = bcm63xx_gpio_get,
150 .set = bcm63xx_gpio_set,
151 .base = 0,
152};
153
154int __init bcm63xx_gpio_init(void)
155{
156 bcm63xx_gpio_out_low_reg_init();
157
158 gpio_out_low = bcm_gpio_readl(gpio_out_low_reg);
159 if (!BCMCPU_IS_6345())
160 gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
161 bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
162 pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);
163
164 return gpiochip_add(&bcm63xx_gpio_chip);
165}