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}
149