OF: pinctrl: MIPS: lantiq: implement lantiq/xway pinctrl support

Implement support for pinctrl on lantiq/xway socs. The IO core found on these
socs has the registers for pinctrl, pinconf and gpio mixed up in the same
register range. As the gpio_chip handling is only a few lines, the driver also
implements the gpio functionality. This obseletes the old gpio driver that was
located in the arch/ folder.

Signed-off-by: John Crispin <blogic@openwrt.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org

4 files changed, 4 insertions, 184 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 331d574df99..b0f74b89d6f 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -241,6 +241,8 @@ config LANTIQ
 	select HAVE_MACH_CLKDEV
 	select CLKDEV_LOOKUP
 	select USE_OF
+	select PINCTRL
+	select PINCTRL_LANTIQ
 
 config LASAT
 	bool "LASAT Networks platforms"
diff --git a/arch/mips/lantiq/Kconfig b/arch/mips/lantiq/Kconfig
index 20bdf40b3ef..080c01349f9 100644
--- a/arch/mips/lantiq/Kconfig
+++ b/arch/mips/lantiq/Kconfig
@@ -2,6 +2,7 @@ if LANTIQ
 
 config SOC_TYPE_XWAY
 	bool
+	select PINCTRL_XWAY
 	default n
 
 choice
diff --git a/arch/mips/lantiq/xway/Makefile b/arch/mips/lantiq/xway/Makefile
index f7053b89ad1..70a58c747bd 100644
--- a/arch/mips/lantiq/xway/Makefile
+++ b/arch/mips/lantiq/xway/Makefile
@@ -1 +1 @@
-obj-y := prom.o sysctrl.o clk.o reset.o gpio.o dma.o gptu.o
+obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o
diff --git a/arch/mips/lantiq/xway/gpio.c b/arch/mips/lantiq/xway/gpio.c
deleted file mode 100644
index 2ab39e93d9b..00000000000
--- a/arch/mips/lantiq/xway/gpio.c
+++ /dev/null
@@ -1,183 +0,0 @@
-/*
- *  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.
- *
- *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
- */
-
-#include <linux/slab.h>
-#include <linux/export.h>
-#include <linux/platform_device.h>
-#include <linux/gpio.h>
-#include <linux/ioport.h>
-#include <linux/io.h>
-
-#include <lantiq_soc.h>
-
-#define LTQ_GPIO_OUT		0x00
-#define LTQ_GPIO_IN		0x04
-#define LTQ_GPIO_DIR		0x08
-#define LTQ_GPIO_ALTSEL0	0x0C
-#define LTQ_GPIO_ALTSEL1	0x10
-#define LTQ_GPIO_OD		0x14
-
-#define PINS_PER_PORT		16
-#define MAX_PORTS		3
-
-#define ltq_gpio_getbit(m, r, p)	(!!(ltq_r32(m + r) & (1 << p)))
-#define ltq_gpio_setbit(m, r, p)	ltq_w32_mask(0, (1 << p), m + r)
-#define ltq_gpio_clearbit(m, r, p)	ltq_w32_mask((1 << p), 0, m + r)
-
-struct ltq_gpio {
-	void __iomem *membase;
-	struct gpio_chip chip;
-};
-
-static struct ltq_gpio ltq_gpio_port[MAX_PORTS];
-
-int ltq_gpio_request(unsigned int pin, unsigned int alt0,
-	unsigned int alt1, unsigned int dir, const char *name)
-{
-	int id = 0;
-
-	if (pin >= (MAX_PORTS * PINS_PER_PORT))
-		return -EINVAL;
-	if (gpio_request(pin, name)) {
-		pr_err("failed to setup lantiq gpio: %s\n", name);
-		return -EBUSY;
-	}
-	if (dir)
-		gpio_direction_output(pin, 1);
-	else
-		gpio_direction_input(pin);
-	while (pin >= PINS_PER_PORT) {
-		pin -= PINS_PER_PORT;
-		id++;
-	}
-	if (alt0)
-		ltq_gpio_setbit(ltq_gpio_port[id].membase,
-			LTQ_GPIO_ALTSEL0, pin);
-	else
-		ltq_gpio_clearbit(ltq_gpio_port[id].membase,
-			LTQ_GPIO_ALTSEL0, pin);
-	if (alt1)
-		ltq_gpio_setbit(ltq_gpio_port[id].membase,
-			LTQ_GPIO_ALTSEL1, pin);
-	else
-		ltq_gpio_clearbit(ltq_gpio_port[id].membase,
-			LTQ_GPIO_ALTSEL1, pin);
-	return 0;
-}
-EXPORT_SYMBOL(ltq_gpio_request);
-
-static void ltq_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
-{
-	struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
-
-	if (value)
-		ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_OUT, offset);
-	else
-		ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_OUT, offset);
-}
-
-static int ltq_gpio_get(struct gpio_chip *chip, unsigned int offset)
-{
-	struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
-
-	return ltq_gpio_getbit(ltq_gpio->membase, LTQ_GPIO_IN, offset);
-}
-
-static int ltq_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
-{
-	struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
-
-	ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
-	ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_DIR, offset);
-
-	return 0;
-}
-
-static int ltq_gpio_direction_output(struct gpio_chip *chip,
-	unsigned int offset, int value)
-{
-	struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
-
-	ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_OD, offset);
-	ltq_gpio_setbit(ltq_gpio->membase, LTQ_GPIO_DIR, offset);
-	ltq_gpio_set(chip, offset, value);
-
-	return 0;
-}
-
-static int ltq_gpio_req(struct gpio_chip *chip, unsigned offset)
-{
-	struct ltq_gpio *ltq_gpio = container_of(chip, struct ltq_gpio, chip);
-
-	ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_ALTSEL0, offset);
-	ltq_gpio_clearbit(ltq_gpio->membase, LTQ_GPIO_ALTSEL1, offset);
-	return 0;
-}
-
-static int ltq_gpio_probe(struct platform_device *pdev)
-{
-	struct resource *res;
-
-	if (pdev->id >= MAX_PORTS) {
-		dev_err(&pdev->dev, "invalid gpio port %d\n",
-			pdev->id);
-		return -EINVAL;
-	}
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "failed to get memory for gpio port %d\n",
-			pdev->id);
-		return -ENOENT;
-	}
-	res = devm_request_mem_region(&pdev->dev, res->start,
-		resource_size(res), dev_name(&pdev->dev));
-	if (!res) {
-		dev_err(&pdev->dev,
-			"failed to request memory for gpio port %d\n",
-			pdev->id);
-		return -EBUSY;
-	}
-	ltq_gpio_port[pdev->id].membase = devm_ioremap_nocache(&pdev->dev,
-		res->start, resource_size(res));
-	if (!ltq_gpio_port[pdev->id].membase) {
-		dev_err(&pdev->dev, "failed to remap memory for gpio port %d\n",
-			pdev->id);
-		return -ENOMEM;
-	}
-	ltq_gpio_port[pdev->id].chip.label = "ltq_gpio";
-	ltq_gpio_port[pdev->id].chip.direction_input = ltq_gpio_direction_input;
-	ltq_gpio_port[pdev->id].chip.direction_output =
-		ltq_gpio_direction_output;
-	ltq_gpio_port[pdev->id].chip.get = ltq_gpio_get;
-	ltq_gpio_port[pdev->id].chip.set = ltq_gpio_set;
-	ltq_gpio_port[pdev->id].chip.request = ltq_gpio_req;
-	ltq_gpio_port[pdev->id].chip.base = PINS_PER_PORT * pdev->id;
-	ltq_gpio_port[pdev->id].chip.ngpio = PINS_PER_PORT;
-	platform_set_drvdata(pdev, &ltq_gpio_port[pdev->id]);
-	return gpiochip_add(&ltq_gpio_port[pdev->id].chip);
-}
-
-static struct platform_driver
-ltq_gpio_driver = {
-	.probe = ltq_gpio_probe,
-	.driver = {
-		.name = "ltq_gpio",
-		.owner = THIS_MODULE,
-	},
-};
-
-int __init ltq_gpio_init(void)
-{
-	int ret = platform_driver_register(&ltq_gpio_driver);
-
-	if (ret)
-		pr_info("ltq_gpio : Error registering platform driver!");
-	return ret;
-}
-
-postcore_initcall(ltq_gpio_init);