openwrt/target/linux/octeon/patches-3.10/130-gpio.patch

Index: linux-3.10.49/drivers/gpio/Kconfig
===================================================================
--- linux-3.10.49.orig/drivers/gpio/Kconfig	2014-07-18 00:58:15.000000000 +0200
+++ linux-3.10.49/drivers/gpio/Kconfig	2014-08-07 11:41:16.517169817 +0200
@@ -171,6 +171,14 @@
 	  Qualcomm MSM chips.  Most of the pins on the MSM can be
 	  selected for GPIO, and are controlled by this driver.
 
+config GPIO_OCTEON
+	tristate "Cavium OCTEON GPIO"
+	depends on GPIOLIB && CPU_CAVIUM_OCTEON
+	default y
+	help
+	  Say yes here to support the on-chip GPIO lines on the OCTEON
+	  family of SOCs.
+
 config GPIO_MVEBU
 	def_bool y
 	depends on PLAT_ORION
Index: linux-3.10.49/drivers/gpio/Makefile
===================================================================
--- linux-3.10.49.orig/drivers/gpio/Makefile	2014-07-18 00:58:15.000000000 +0200
+++ linux-3.10.49/drivers/gpio/Makefile	2014-08-07 11:41:16.517169817 +0200
@@ -10,6 +10,7 @@
 # Device drivers. Generally keep list sorted alphabetically
 obj-$(CONFIG_GPIO_GENERIC)	+= gpio-generic.o
 
+obj-$(CONFIG_GPIO_OCTEON)	+= gpio-octeon.o
 obj-$(CONFIG_GPIO_74X164)	+= gpio-74x164.o
 obj-$(CONFIG_GPIO_ADNP)		+= gpio-adnp.o
 obj-$(CONFIG_GPIO_ADP5520)	+= gpio-adp5520.o
Index: linux-3.10.49/drivers/gpio/gpio-octeon.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-3.10.49/drivers/gpio/gpio-octeon.c	2014-08-07 11:53:14.733161106 +0200
@@ -0,0 +1,166 @@
+/*
+ * 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) 2011,2012 Cavium Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+
+#include <asm/octeon/octeon.h>
+#include <asm/octeon/cvmx-gpio-defs.h>
+
+#define DRV_VERSION "1.0"
+#define DRV_DESCRIPTION "Cavium Inc. OCTEON GPIO Driver"
+
+#define RX_DAT 0x80
+#define TX_SET 0x88
+#define TX_CLEAR 0x90
+
+int gpio_to_irq(unsigned gpio)
+{
+	return -EINVAL;
+}
+EXPORT_SYMBOL(gpio_to_irq);
+
+/*
+ * The address offset of the GPIO configuration register for a given
+ * line.
+ */
+static unsigned int bit_cfg_reg(unsigned int gpio)
+{
+	if (gpio < 16)
+		return 8 * gpio;
+	else
+		return 8 * (gpio - 16) + 0x100;
+}
+
+struct octeon_gpio {
+	struct gpio_chip chip;
+	u64 register_base;
+};
+
+static int octeon_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
+{
+	struct octeon_gpio *gpio = container_of(chip, struct octeon_gpio, chip);
+
+	cvmx_write_csr(gpio->register_base + bit_cfg_reg(offset), 0);
+	return 0;
+}
+
+static void octeon_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	struct octeon_gpio *gpio = container_of(chip, struct octeon_gpio, chip);
+	u64 mask = 1ull << offset;
+	u64 reg = gpio->register_base + (value ? TX_SET : TX_CLEAR);
+	cvmx_write_csr(reg, mask);
+}
+
+static int octeon_gpio_dir_out(struct gpio_chip *chip, unsigned offset,
+			       int value)
+{
+	struct octeon_gpio *gpio = container_of(chip, struct octeon_gpio, chip);
+	union cvmx_gpio_bit_cfgx cfgx;
+
+
+	octeon_gpio_set(chip, offset, value);
+
+	cfgx.u64 = 0;
+	cfgx.s.tx_oe = 1;
+
+	cvmx_write_csr(gpio->register_base + bit_cfg_reg(offset), cfgx.u64);
+	return 0;
+}
+
+static int octeon_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct octeon_gpio *gpio = container_of(chip, struct octeon_gpio, chip);
+	u64 read_bits = cvmx_read_csr(gpio->register_base + RX_DAT);
+
+	return ((1ull << offset) & read_bits) != 0;
+}
+
+static int octeon_gpio_probe(struct platform_device *pdev)
+{
+	struct octeon_gpio *gpio;
+	struct gpio_chip *chip;
+	struct resource *res_mem;
+	int err = 0;
+
+	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+	if (!gpio)
+		return -ENOMEM;
+	chip = &gpio->chip;
+
+	res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res_mem == NULL) {
+		dev_err(&pdev->dev, "found no memory resource\n");
+		err = -ENXIO;
+		goto out;
+	}
+	if (!devm_request_mem_region(&pdev->dev, res_mem->start,
+					resource_size(res_mem),
+				     res_mem->name)) {
+		dev_err(&pdev->dev, "request_mem_region failed\n");
+		err = -ENXIO;
+		goto out;
+	}
+	gpio->register_base = (u64)devm_ioremap(&pdev->dev, res_mem->start,
+						resource_size(res_mem));
+
+
+	pdev->dev.platform_data = chip;
+	chip->label = "octeon-gpio";
+	chip->dev = &pdev->dev;
+	chip->owner = THIS_MODULE;
+	chip->base = 0;
+	chip->can_sleep = 0;
+	chip->ngpio = 20;
+	chip->direction_input = octeon_gpio_dir_in;
+	chip->get = octeon_gpio_get;
+	chip->direction_output = octeon_gpio_dir_out;
+	chip->set = octeon_gpio_set;
+	err = gpiochip_add(chip);
+	if (err)
+		goto out;
+
+	dev_info(&pdev->dev, "version: " DRV_VERSION "\n");
+out:
+	return err;
+}
+
+static int octeon_gpio_remove(struct platform_device *pdev)
+{
+	struct gpio_chip *chip = pdev->dev.platform_data;
+	return gpiochip_remove(chip);
+}
+
+static struct of_device_id octeon_gpio_match[] = {
+	{
+		.compatible = "cavium,octeon-3860-gpio",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, octeon_gpio_match);
+
+static struct platform_driver octeon_gpio_driver = {
+	.probe		= octeon_gpio_probe,
+	.remove		= octeon_gpio_remove,
+	.driver = {
+		.name		= "octeon_gpio",
+		.owner		= THIS_MODULE,
+		.of_match_table = octeon_gpio_match,
+	},
+};
+
+module_platform_driver(octeon_gpio_driver);
+
+MODULE_DESCRIPTION(DRV_DESCRIPTION);
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
Index: linux-3.10.49/arch/mips/Kconfig
===================================================================
--- linux-3.10.49.orig/arch/mips/Kconfig	2014-08-07 11:41:14.809169838 +0200
+++ linux-3.10.49/arch/mips/Kconfig	2014-08-07 11:41:16.521169817 +0200
@@ -769,6 +769,7 @@
 	select USB_ARCH_HAS_OHCI
 	select USB_ARCH_HAS_EHCI
 	select HOLES_IN_ZONE
+	select ARCH_REQUIRE_GPIOLIB
 	help
 	  This option supports all of the Octeon reference boards from Cavium
 	  Networks. It builds a kernel that dynamically determines the Octeon