MIPS: ath79: add GPIO support code for AR934X

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Acked-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Cc: linux-mips@linux-mips.org
Cc: mcgrof@infradead.org
Patchwork: https://patchwork.linux-mips.org/patch/3508/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/ath79/gpio.c b/arch/mips/ath79/gpio.c
index a2f8ca6..29054f2 100644 (file)
--- a/arch/mips/ath79/gpio.c
+++ b/arch/mips/ath79/gpio.c
@@ -1,9 +1,12 @@
 /*
  *  Atheros AR71XX/AR724X/AR913X GPIO API support
  *
- *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
+ *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  *
+ *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
+ *
  *  This program is free software; you can redistribute it and/or modify it
  *  under the terms of the GNU General Public License version 2 as published
  *  by the Free Software Foundation.
@@ -89,6 +92,42 @@ static int ath79_gpio_direction_output(struct gpio_chip *chip,
        return 0;
 }
 
+static int ar934x_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+       void __iomem *base = ath79_gpio_base;
+       unsigned long flags;
+
+       spin_lock_irqsave(&ath79_gpio_lock, flags);
+
+       __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset),
+                    base + AR71XX_GPIO_REG_OE);
+
+       spin_unlock_irqrestore(&ath79_gpio_lock, flags);
+
+       return 0;
+}
+
+static int ar934x_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
+                                       int value)
+{
+       void __iomem *base = ath79_gpio_base;
+       unsigned long flags;
+
+       spin_lock_irqsave(&ath79_gpio_lock, flags);
+
+       if (value)
+               __raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET);
+       else
+               __raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR);
+
+       __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset),
+                    base + AR71XX_GPIO_REG_OE);
+
+       spin_unlock_irqrestore(&ath79_gpio_lock, flags);
+
+       return 0;
+}
+
 static struct gpio_chip ath79_gpio_chip = {
        .label                  = "ath79",
        .get                    = ath79_gpio_get_value,
@@ -155,11 +194,17 @@ void __init ath79_gpio_init(void)
                ath79_gpio_count = AR913X_GPIO_COUNT;
        else if (soc_is_ar933x())
                ath79_gpio_count = AR933X_GPIO_COUNT;
+       else if (soc_is_ar934x())
+               ath79_gpio_count = AR934X_GPIO_COUNT;
        else
                BUG();
 
        ath79_gpio_base = ioremap_nocache(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE);
        ath79_gpio_chip.ngpio = ath79_gpio_count;
+       if (soc_is_ar934x()) {
+               ath79_gpio_chip.direction_input = ar934x_gpio_direction_input;
+               ath79_gpio_chip.direction_output = ar934x_gpio_direction_output;
+       }
 
        err = gpiochip_add(&ath79_gpio_chip);
        if (err)

diff --git a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
index bc1c345..1a9234b 100644 (file)
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -367,5 +367,6 @@
 #define AR724X_GPIO_COUNT              18
 #define AR913X_GPIO_COUNT              22
 #define AR933X_GPIO_COUNT              30
+#define AR934X_GPIO_COUNT              23
 
 #endif /* __ASM_MACH_AR71XX_REGS_H */