aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/ramips/patches-3.10/0506-GPIO-ralink-add-mt7621-gpio-controller.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/ramips/patches-3.10/0506-GPIO-ralink-add-mt7621-gpio-controller.patch')
-rw-r--r--target/linux/ramips/patches-3.10/0506-GPIO-ralink-add-mt7621-gpio-controller.patch228
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);