arch/mips/ath79/gpio.c

   1 /*
   2  *  Atheros AR71XX/AR724X/AR913X GPIO API support
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify it
   8  *  under the terms of the GNU General Public License version 2 as published
   9  *  by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/io.h>
  18 #include <linux/ioport.h>
  19 #include <linux/gpio.h>
  20
  21 #include <asm/mach-ath79/ar71xx_regs.h>
  22 #include <asm/mach-ath79/ath79.h>
  23 #include "common.h"
  24
  25 static void __iomem *ath79_gpio_base;
  26 static unsigned long ath79_gpio_count;
  27 static DEFINE_SPINLOCK(ath79_gpio_lock);
  28
  29 static void __ath79_gpio_set_value(unsigned gpio, int value)
  30 {
  31         void __iomem *base = ath79_gpio_base;
  32
  33         if (value)
  34                 __raw_writel(1 << gpio, base + AR71XX_GPIO_REG_SET);
  35         else
  36                 __raw_writel(1 << gpio, base + AR71XX_GPIO_REG_CLEAR);
  37 }
  38
  39 static int __ath79_gpio_get_value(unsigned gpio)
  40 {
  41         return (__raw_readl(ath79_gpio_base + AR71XX_GPIO_REG_IN) >> gpio) & 1;
  42 }
  43
  44 static int ath79_gpio_get_value(struct gpio_chip *chip, unsigned offset)
  45 {
  46         return __ath79_gpio_get_value(offset);
  47 }
  48
  49 static void ath79_gpio_set_value(struct gpio_chip *chip,
  50                                   unsigned offset, int value)
  51 {
  52         __ath79_gpio_set_value(offset, value);
  53 }
  54
  55 static int ath79_gpio_direction_input(struct gpio_chip *chip,
  56                                        unsigned offset)
  57 {
  58         void __iomem *base = ath79_gpio_base;
  59         unsigned long flags;
  60
  61         spin_lock_irqsave(&ath79_gpio_lock, flags);
  62
  63         __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
  64                      base + AR71XX_GPIO_REG_OE);
  65
  66         spin_unlock_irqrestore(&ath79_gpio_lock, flags);
  67
  68         return 0;
  69 }
  70
  71 static int ath79_gpio_direction_output(struct gpio_chip *chip,
  72                                         unsigned offset, int value)
  73 {
  74         void __iomem *base = ath79_gpio_base;
  75         unsigned long flags;
  76
  77         spin_lock_irqsave(&ath79_gpio_lock, flags);
  78
  79         if (value)
  80                 __raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET);
  81         else
  82                 __raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR);
  83
  84         __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset),
  85                      base + AR71XX_GPIO_REG_OE);
  86
  87         spin_unlock_irqrestore(&ath79_gpio_lock, flags);
  88
  89         return 0;
  90 }
  91
  92 static struct gpio_chip ath79_gpio_chip = {
  93         .label                  = "ath79",
  94         .get                    = ath79_gpio_get_value,
  95         .set                    = ath79_gpio_set_value,
  96         .direction_input        = ath79_gpio_direction_input,
  97         .direction_output       = ath79_gpio_direction_output,
  98         .base                   = 0,
  99 };
 100
 101 void ath79_gpio_function_enable(u32 mask)
 102 {
 103         void __iomem *base = ath79_gpio_base;
 104         unsigned long flags;
 105
 106         spin_lock_irqsave(&ath79_gpio_lock, flags);
 107
 108         __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) | mask,
 109                      base + AR71XX_GPIO_REG_FUNC);
 110         /* flush write */
 111         __raw_readl(base + AR71XX_GPIO_REG_FUNC);
 112
 113         spin_unlock_irqrestore(&ath79_gpio_lock, flags);
 114 }
 115
 116 void ath79_gpio_function_disable(u32 mask)
 117 {
 118         void __iomem *base = ath79_gpio_base;
 119         unsigned long flags;
 120
 121         spin_lock_irqsave(&ath79_gpio_lock, flags);
 122
 123         __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~mask,
 124                      base + AR71XX_GPIO_REG_FUNC);
 125         /* flush write */
 126         __raw_readl(base + AR71XX_GPIO_REG_FUNC);
 127
 128         spin_unlock_irqrestore(&ath79_gpio_lock, flags);
 129 }
 130
 131 void ath79_gpio_function_setup(u32 set, u32 clear)
 132 {
 133         void __iomem *base = ath79_gpio_base;
 134         unsigned long flags;
 135
 136         spin_lock_irqsave(&ath79_gpio_lock, flags);
 137
 138         __raw_writel((__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~clear) | set,
 139                      base + AR71XX_GPIO_REG_FUNC);
 140         /* flush write */
 141         __raw_readl(base + AR71XX_GPIO_REG_FUNC);
 142
 143         spin_unlock_irqrestore(&ath79_gpio_lock, flags);
 144 }
 145
 146 void __init ath79_gpio_init(void)
 147 {
 148         int err;
 149
 150         if (soc_is_ar71xx())
 151                 ath79_gpio_count = AR71XX_GPIO_COUNT;
 152         else if (soc_is_ar724x())
 153                 ath79_gpio_count = AR724X_GPIO_COUNT;
 154         else if (soc_is_ar913x())
 155                 ath79_gpio_count = AR913X_GPIO_COUNT;
 156         else if (soc_is_ar933x())
 157                 ath79_gpio_count = AR933X_GPIO_COUNT;
 158         else
 159                 BUG();
 160
 161         ath79_gpio_base = ioremap_nocache(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE);
 162         ath79_gpio_chip.ngpio = ath79_gpio_count;
 163
 164         err = gpiochip_add(&ath79_gpio_chip);
 165         if (err)
 166                 panic("cannot add AR71xx GPIO chip, error=%d", err);
 167 }
 168
 169 int gpio_get_value(unsigned gpio)
 170 {
 171         if (gpio < ath79_gpio_count)
 172                 return __ath79_gpio_get_value(gpio);
 173
 174         return __gpio_get_value(gpio);
 175 }
 176 EXPORT_SYMBOL(gpio_get_value);
 177
 178 void gpio_set_value(unsigned gpio, int value)
 179 {
 180         if (gpio < ath79_gpio_count)
 181                 __ath79_gpio_set_value(gpio, value);
 182         else
 183                 __gpio_set_value(gpio, value);
 184 }
 185 EXPORT_SYMBOL(gpio_set_value);
 186
 187 int gpio_to_irq(unsigned gpio)
 188 {
 189         /* FIXME */
 190         return -EINVAL;
 191 }
 192 EXPORT_SYMBOL(gpio_to_irq);
 193
 194 int irq_to_gpio(unsigned irq)
 195 {
 196         /* FIXME */
 197         return -EINVAL;
 198 }
 199 EXPORT_SYMBOL(irq_to_gpio);