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/Ethereal-msm8939-beta9/arch/mips/bcm63xx/gpio.c

https://bitbucket.org/MilosStamenkovic95/etherealos
C | 165 lines | 131 code | 26 blank | 8 comment | 14 complexity | 81ecebf46a8d23e8b5c20bc4c967fde6 MD5 | raw file
  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}