You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
231 lines
5.8 KiB
Diff
231 lines
5.8 KiB
Diff
From 8481cdf6f96dc16cbcc129d046c021d17a891274 Mon Sep 17 00:00:00 2001
|
|
From: John Crispin <blogic@openwrt.org>
|
|
Date: Sun, 27 Jul 2014 11:00:32 +0100
|
|
Subject: [PATCH 48/57] GPIO: ralink: add mt7621 gpio controller
|
|
|
|
Signed-off-by: John Crispin <blogic@openwrt.org>
|
|
---
|
|
arch/mips/Kconfig | 3 +
|
|
drivers/gpio/Kconfig | 6 ++
|
|
drivers/gpio/Makefile | 1 +
|
|
drivers/gpio/gpio-mt7621.c | 177 ++++++++++++++++++++++++++++++++++++++++++++
|
|
4 files changed, 187 insertions(+)
|
|
create mode 100644 drivers/gpio/gpio-mt7621.c
|
|
|
|
--- a/arch/mips/Kconfig
|
|
+++ b/arch/mips/Kconfig
|
|
@@ -455,6 +455,9 @@ config RALINK
|
|
select RESET_CONTROLLER
|
|
select PINCTRL
|
|
select PINCTRL_RT2880
|
|
+ select ARCH_HAS_RESET_CONTROLLER
|
|
+ select RESET_CONTROLLER
|
|
+ select ARCH_REQUIRE_GPIOLIB
|
|
|
|
config SGI_IP22
|
|
bool "SGI IP22 (Indy/Indigo2)"
|
|
--- a/drivers/gpio/Kconfig
|
|
+++ b/drivers/gpio/Kconfig
|
|
@@ -898,6 +898,12 @@ config GPIO_BCM_KONA
|
|
help
|
|
Turn on GPIO support for Broadcom "Kona" chips.
|
|
|
|
+config GPIO_MT7621
|
|
+ bool "Mediatek GPIO Support"
|
|
+ depends on SOC_MT7620 || SOC_MT7621
|
|
+ help
|
|
+ Say yes here to support the Mediatek SoC GPIO device
|
|
+
|
|
comment "USB GPIO expanders:"
|
|
|
|
config GPIO_VIPERBOARD
|
|
--- a/drivers/gpio/Makefile
|
|
+++ b/drivers/gpio/Makefile
|
|
@@ -107,3 +107,5 @@ obj-$(CONFIG_GPIO_XILINX) += gpio-xilinx
|
|
obj-$(CONFIG_GPIO_XTENSA) += gpio-xtensa.o
|
|
obj-$(CONFIG_GPIO_ZEVIO) += gpio-zevio.o
|
|
obj-$(CONFIG_GPIO_ZYNQ) += gpio-zynq.o
|
|
+obj-$(CONFIG_GPIO_MT7621) += gpio-mt7621.o
|
|
+
|
|
--- /dev/null
|
|
+++ b/drivers/gpio/gpio-mt7621.c
|
|
@@ -0,0 +1,178 @@
|
|
+/*
|
|
+ * 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;
|
|
+};
|
|
+
|
|
+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;
|
|
+ rg->bank = be32_to_cpu(*id);
|
|
+
|
|
+ /* 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_ioremap_resource(&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);
|