From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/mips/bcm63xx/gpio.c | 151 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 arch/mips/bcm63xx/gpio.c

(limited to 'arch/mips/bcm63xx/gpio.c')

diff --git a/arch/mips/bcm63xx/gpio.c b/arch/mips/bcm63xx/gpio.c
new file mode 100644
index 000000000..468bc7b99
--- /dev/null
+++ b/arch/mips/bcm63xx/gpio.c
@@ -0,0 +1,151 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ * Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+#include <bcm63xx_cpu.h>
+#include <bcm63xx_gpio.h>
+#include <bcm63xx_io.h>
+#include <bcm63xx_regs.h>
+
+static u32 gpio_out_low_reg;
+
+static void bcm63xx_gpio_out_low_reg_init(void)
+{
+	switch (bcm63xx_get_cpu_id()) {
+	case BCM6345_CPU_ID:
+		gpio_out_low_reg = GPIO_DATA_LO_REG_6345;
+		break;
+	default:
+		gpio_out_low_reg = GPIO_DATA_LO_REG;
+		break;
+	}
+}
+
+static DEFINE_SPINLOCK(bcm63xx_gpio_lock);
+static u32 gpio_out_low, gpio_out_high;
+
+static void bcm63xx_gpio_set(struct gpio_chip *chip,
+			     unsigned gpio, int val)
+{
+	u32 reg;
+	u32 mask;
+	u32 *v;
+	unsigned long flags;
+
+	if (gpio >= chip->ngpio)
+		BUG();
+
+	if (gpio < 32) {
+		reg = gpio_out_low_reg;
+		mask = 1 << gpio;
+		v = &gpio_out_low;
+	} else {
+		reg = GPIO_DATA_HI_REG;
+		mask = 1 << (gpio - 32);
+		v = &gpio_out_high;
+	}
+
+	spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
+	if (val)
+		*v |= mask;
+	else
+		*v &= ~mask;
+	bcm_gpio_writel(*v, reg);
+	spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
+}
+
+static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio)
+{
+	u32 reg;
+	u32 mask;
+
+	if (gpio >= chip->ngpio)
+		BUG();
+
+	if (gpio < 32) {
+		reg = gpio_out_low_reg;
+		mask = 1 << gpio;
+	} else {
+		reg = GPIO_DATA_HI_REG;
+		mask = 1 << (gpio - 32);
+	}
+
+	return !!(bcm_gpio_readl(reg) & mask);
+}
+
+static int bcm63xx_gpio_set_direction(struct gpio_chip *chip,
+				      unsigned gpio, int dir)
+{
+	u32 reg;
+	u32 mask;
+	u32 tmp;
+	unsigned long flags;
+
+	if (gpio >= chip->ngpio)
+		BUG();
+
+	if (gpio < 32) {
+		reg = GPIO_CTL_LO_REG;
+		mask = 1 << gpio;
+	} else {
+		reg = GPIO_CTL_HI_REG;
+		mask = 1 << (gpio - 32);
+	}
+
+	spin_lock_irqsave(&bcm63xx_gpio_lock, flags);
+	tmp = bcm_gpio_readl(reg);
+	if (dir == BCM63XX_GPIO_DIR_IN)
+		tmp &= ~mask;
+	else
+		tmp |= mask;
+	bcm_gpio_writel(tmp, reg);
+	spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags);
+
+	return 0;
+}
+
+static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+	return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN);
+}
+
+static int bcm63xx_gpio_direction_output(struct gpio_chip *chip,
+					 unsigned gpio, int value)
+{
+	bcm63xx_gpio_set(chip, gpio, value);
+	return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT);
+}
+
+
+static struct gpio_chip bcm63xx_gpio_chip = {
+	.label			= "bcm63xx-gpio",
+	.direction_input	= bcm63xx_gpio_direction_input,
+	.direction_output	= bcm63xx_gpio_direction_output,
+	.get			= bcm63xx_gpio_get,
+	.set			= bcm63xx_gpio_set,
+	.base			= 0,
+};
+
+int __init bcm63xx_gpio_init(void)
+{
+	bcm63xx_gpio_out_low_reg_init();
+
+	gpio_out_low = bcm_gpio_readl(gpio_out_low_reg);
+	if (!BCMCPU_IS_6345())
+		gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG);
+	bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count();
+	pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio);
+
+	return gpiochip_add(&bcm63xx_gpio_chip);
+}
-- 
cgit v1.2.3-54-g00ecf