ralink: add mt7621 support

there are still various missing pieces for full support.

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39040 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 228 insertions, 0 deletions

diff --git a/target/linux/ramips/patches-3.10/0506-GPIO-ralink-add-mt7621-gpio-controller.patch b/target/linux/ramips/patches-3.10/0506-GPIO-ralink-add-mt7621-gpio-controller.patch
new file mode 100644
index 0000000000..72048c57cc
--- /dev/null
+++ b/target/linux/ramips/patches-3.10/0506-GPIO-ralink-add-mt7621-gpio-controller.patch
@@ -0,0 +1,228 @@
+From e19957560170d63c6a5f0b1d7ba63695e4d1f033 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Mon, 2 Dec 2013 16:14:28 +0100
+Subject: [PATCH 506/507] GPIO: ralink: add mt7621 gpio controller
+
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ arch/mips/Kconfig          |    1 +
+ drivers/gpio/Kconfig       |    6 ++
+ drivers/gpio/Makefile      |    1 +
+ drivers/gpio/gpio-mt7621.c |  183 ++++++++++++++++++++++++++++++++++++++++++++
+ 4 files changed, 191 insertions(+)
+ create mode 100644 drivers/gpio/gpio-mt7621.c
+
+Index: linux-3.10.21/drivers/gpio/Kconfig
+===================================================================
+--- linux-3.10.21.orig/drivers/gpio/Kconfig	2013-12-09 19:56:09.376682007 +0100
++++ linux-3.10.21/drivers/gpio/Kconfig	2013-12-09 19:58:35.372685422 +0100
+@@ -710,6 +710,12 @@
+ 	  Enable support for GPIO on intel MSIC controllers found in
+ 	  intel MID devices
+ 
++config GPIO_MT7621
++	bool "Mediatek GPIO Support"
++	depends on RALINK && SOC_MT7621
++	help
++	  Say yes here to support the Mediatek SoC GPIO device
++
+ comment "USB GPIO expanders:"
+ 
+ config GPIO_VIPERBOARD
+Index: linux-3.10.21/drivers/gpio/Makefile
+===================================================================
+--- linux-3.10.21.orig/drivers/gpio/Makefile	2013-12-09 19:56:09.376682007 +0100
++++ linux-3.10.21/drivers/gpio/Makefile	2013-12-09 19:56:09.760682017 +0100
+@@ -88,3 +88,4 @@
+ obj-$(CONFIG_GPIO_WM8350)	+= gpio-wm8350.o
+ obj-$(CONFIG_GPIO_WM8994)	+= gpio-wm8994.o
+ obj-$(CONFIG_GPIO_XILINX)	+= gpio-xilinx.o
++obj-$(CONFIG_GPIO_MT7621)	+= gpio-mt7621.o
+Index: linux-3.10.21/drivers/gpio/gpio-mt7621.c
+===================================================================
+--- /dev/null	1970-01-01 00:00:00.000000000 +0000
++++ linux-3.10.21/drivers/gpio/gpio-mt7621.c	2013-12-09 19:56:09.760682017 +0100
+@@ -0,0 +1,183 @@
++/*
++ * 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) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
++ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
++ */
++
++#include <linux/io.h>
++#include <linux/err.h>
++#include <linux/gpio.h>
++#include <linux/module.h>
++#include <linux/of_irq.h>
++#include <linux/spinlock.h>
++#include <linux/irqdomain.h>
++#include <linux/interrupt.h>
++#include <linux/platform_device.h>
++
++#define MTK_BANK_WIDTH		32
++
++enum mediatek_gpio_reg {
++	GPIO_REG_CTRL = 0,
++	GPIO_REG_POL,
++	GPIO_REG_DATA,
++	GPIO_REG_DSET,
++	GPIO_REG_DCLR,
++};
++
++static void __iomem *mtk_gc_membase;
++
++struct mtk_gc {
++	struct gpio_chip chip;
++	spinlock_t lock;
++	int bank;
++};
++
++int
++gpio_to_irq(unsigned gpio)
++{
++	return -1;
++}
++
++static inline struct mtk_gc
++*to_mediatek_gpio(struct gpio_chip *chip)
++{
++	struct mtk_gc *mgc;
++
++	mgc = container_of(chip, struct mtk_gc, chip);
++
++	return mgc;
++}
++
++static inline void
++mtk_gpio_w32(struct mtk_gc *rg, u8 reg, u32 val)
++{
++	iowrite32(val, mtk_gc_membase + (reg * 0x10) + (rg->bank * 0x4));
++}
++
++static inline u32
++mtk_gpio_r32(struct mtk_gc *rg, u8 reg)
++{
++	return ioread32(mtk_gc_membase + (reg * 0x10) + (rg->bank * 0x4));
++}
++
++static void
++mediatek_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
++{
++	struct mtk_gc *rg = to_mediatek_gpio(chip);
++
++	mtk_gpio_w32(rg, (value) ? GPIO_REG_DSET : GPIO_REG_DCLR, BIT(offset));
++}
++
++static int
++mediatek_gpio_get(struct gpio_chip *chip, unsigned offset)
++{
++	struct mtk_gc *rg = to_mediatek_gpio(chip);
++
++	return !!(mtk_gpio_r32(rg, GPIO_REG_DATA) & BIT(offset));
++}
++
++static int
++mediatek_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
++{
++	struct mtk_gc *rg = to_mediatek_gpio(chip);
++	unsigned long flags;
++	u32 t;
++
++	spin_lock_irqsave(&rg->lock, flags);
++	t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
++	t &= ~BIT(offset);
++	mtk_gpio_w32(rg, GPIO_REG_CTRL, t);
++	spin_unlock_irqrestore(&rg->lock, flags);
++
++	return 0;
++}
++
++static int
++mediatek_gpio_direction_output(struct gpio_chip *chip,
++					unsigned offset, int value)
++{
++	struct mtk_gc *rg = to_mediatek_gpio(chip);
++	unsigned long flags;
++	u32 t;
++
++	spin_lock_irqsave(&rg->lock, flags);
++	t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
++	t |= BIT(offset);
++	mtk_gpio_w32(rg, GPIO_REG_CTRL, t);
++	mediatek_gpio_set(chip, offset, value);
++	spin_unlock_irqrestore(&rg->lock, flags);
++
++	return 0;
++}
++
++static int
++mediatek_gpio_bank_probe(struct platform_device *pdev, struct device_node *bank)
++{
++	const __be32 *id = of_get_property(bank, "reg", NULL);
++	struct mtk_gc *rg = devm_kzalloc(&pdev->dev,
++				sizeof(struct mtk_gc), GFP_KERNEL);
++	if (!rg || !id)
++		return -ENOMEM;
++
++	spin_lock_init(&rg->lock);
++
++	rg->chip.dev = &pdev->dev;
++	rg->chip.label = dev_name(&pdev->dev);
++	rg->chip.of_node = bank;
++	rg->chip.base = MTK_BANK_WIDTH * be32_to_cpu(*id);
++	rg->chip.ngpio = MTK_BANK_WIDTH;
++	rg->chip.direction_input = mediatek_gpio_direction_input;
++	rg->chip.direction_output = mediatek_gpio_direction_output;
++	rg->chip.get = mediatek_gpio_get;
++	rg->chip.set = mediatek_gpio_set;
++
++	/* set polarity to low for all gpios */
++	mtk_gpio_w32(rg, GPIO_REG_POL, 0);
++
++	dev_info(&pdev->dev, "registering %d gpios\n", rg->chip.ngpio);
++
++	return gpiochip_add(&rg->chip);
++}
++
++static int
++mediatek_gpio_probe(struct platform_device *pdev)
++{
++	struct device_node *bank, *np = pdev->dev.of_node;
++	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++
++	mtk_gc_membase = devm_request_and_ioremap(&pdev->dev, res);
++	if (IS_ERR(mtk_gc_membase))
++		return PTR_ERR(mtk_gc_membase);
++
++	for_each_child_of_node(np, bank)
++		if (of_device_is_compatible(bank, "mtk,mt7621-gpio-bank"))
++			mediatek_gpio_bank_probe(pdev, bank);
++
++	return 0;
++}
++
++static const struct of_device_id mediatek_gpio_match[] = {
++	{ .compatible = "mtk,mt7621-gpio" },
++	{},
++};
++MODULE_DEVICE_TABLE(of, mediatek_gpio_match);
++
++static struct platform_driver mediatek_gpio_driver = {
++	.probe = mediatek_gpio_probe,
++	.driver = {
++		.name = "mt7621_gpio",
++		.owner = THIS_MODULE,
++		.of_match_table = mediatek_gpio_match,
++	},
++};
++
++static int __init
++mediatek_gpio_init(void)
++{
++	return platform_driver_register(&mediatek_gpio_driver);
++}
++
++subsys_initcall(mediatek_gpio_init);