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
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	if (gpio >= chip->ngpio)
47		BUG();
48
49	if (gpio < 32) {
50		reg = gpio_out_low_reg;
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
68static 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) {
77		reg = gpio_out_low_reg;
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
87static 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);
108	if (dir == BCM63XX_GPIO_DIR_IN)
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
118static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
119{
120	return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN);
121}
122
123static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
124					 unsigned gpio, int value)
125{
126	bcm63xx_gpio_set(chip, gpio, value);
127	return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT);
128}
129
130
131static 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
140int __init bcm63xx_gpio_init(void)
141{
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);
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}
152