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Diffstat (limited to 'target/linux/cns21xx/patches-2.6.37/005-arm-add-fa-gpio-driver.patch')
-rw-r--r--target/linux/cns21xx/patches-2.6.37/005-arm-add-fa-gpio-driver.patch335
1 files changed, 335 insertions, 0 deletions
diff --git a/target/linux/cns21xx/patches-2.6.37/005-arm-add-fa-gpio-driver.patch b/target/linux/cns21xx/patches-2.6.37/005-arm-add-fa-gpio-driver.patch
new file mode 100644
index 0000000000..263a8328b3
--- /dev/null
+++ b/target/linux/cns21xx/patches-2.6.37/005-arm-add-fa-gpio-driver.patch
@@ -0,0 +1,335 @@
+--- /dev/null
++++ b/arch/arm/plat-fa/gpio.c
+@@ -0,0 +1,275 @@
++/*
++ * Gpiochip and interrupt routines for Faraday FA526 based SoCs
++ *
++ * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
++ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
++ *
++ * Based on plat-mxc/gpio.c:
++ * MXC GPIO supchip. (c) 2008 Daniel Mack <daniel@caiaq.de>
++ * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ */
++
++#include <linux/spinlock.h>
++
++#include <plat/gpio.h>
++
++#define GPIO_DATA_OUT 0x0
++#define GPIO_DATA_IN 0x4
++#define GPIO_DIR 0x8
++#define GPIO_DATA_SET 0x10
++#define GPIO_DATA_CLR 0x14
++#define GPIO_PULL_EN 0x18
++#define GPIO_PULL_TYPE 0x1C
++#define GPIO_INT_EN 0x20
++#define GPIO_INT_STAT 0x24
++#define GPIO_INT_MASK 0x2C
++#define GPIO_INT_CLR 0x30
++#define GPIO_INT_TYPE 0x34
++#define GPIO_INT_BOTH_EDGE 0x38
++#define GPIO_INT_LEVEL 0x3C
++#define GPIO_DEBOUNCE_EN 0x40
++#define GPIO_DEBOUNCE_PRESCALE 0x44
++
++#define GPIO_REGS_SIZE 0x48
++
++static DEFINE_SPINLOCK(fa_gpio_lock);
++
++static inline struct fa_gpio_chip *to_fgc(struct gpio_chip *chip)
++{
++ return container_of(chip, struct fa_gpio_chip, gpio_chip);
++}
++
++static void _fa_gpio_irq_setenable(unsigned int irq, int enable)
++{
++ struct fa_gpio_chip *fgc = get_irq_chip_data(irq);
++ void __iomem *base = fgc->mem_base;
++ unsigned int gpio = irq - fgc->irq_base;
++ unsigned int reg;
++
++ reg = __raw_readl(base + GPIO_INT_EN);
++ reg = (reg & (~(1 << gpio))) | (!!enable << gpio);
++ __raw_writel(reg, base + GPIO_INT_EN);
++}
++
++static void fa_gpio_irq_ack(unsigned int irq)
++{
++ struct fa_gpio_chip *fgc = get_irq_chip_data(irq);
++ unsigned int gpio = irq - fgc->irq_base;
++
++ __raw_writel(1 << gpio, fgc->mem_base + GPIO_INT_CLR);
++}
++
++static void fa_gpio_irq_mask(unsigned int irq)
++{
++ _fa_gpio_irq_setenable(irq, 0);
++}
++
++static void fa_gpio_irq_unmask(unsigned int irq)
++{
++ _fa_gpio_irq_setenable(irq, 1);
++}
++
++static int fa_gpio_irq_set_type(unsigned int irq, unsigned int type)
++{
++ struct fa_gpio_chip *fgc = get_irq_chip_data(irq);
++ void __iomem *base = fgc->mem_base;
++ unsigned int gpio = irq - fgc->irq_base;
++ unsigned int gpio_mask = 1 << gpio;
++ unsigned int reg_both, reg_level, reg_type;
++
++ reg_type = __raw_readl(base + GPIO_INT_TYPE);
++ reg_level = __raw_readl(base + GPIO_INT_LEVEL);
++ reg_both = __raw_readl(base + GPIO_INT_BOTH_EDGE);
++
++ switch (type) {
++ case IRQ_TYPE_EDGE_BOTH:
++ reg_type &= ~gpio_mask;
++ reg_both |= gpio_mask;
++ break;
++ case IRQ_TYPE_EDGE_RISING:
++ reg_type &= ~gpio_mask;
++ reg_both &= ~gpio_mask;
++ reg_level &= ~gpio_mask;
++ break;
++ case IRQ_TYPE_EDGE_FALLING:
++ reg_type &= ~gpio_mask;
++ reg_both &= ~gpio_mask;
++ reg_level |= gpio_mask;
++ break;
++ case IRQ_TYPE_LEVEL_HIGH:
++ reg_type |= gpio_mask;
++ reg_level &= ~gpio_mask;
++ break;
++ case IRQ_TYPE_LEVEL_LOW:
++ reg_type |= gpio_mask;
++ reg_level |= gpio_mask;
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ __raw_writel(reg_type, base + GPIO_INT_TYPE);
++ __raw_writel(reg_level, base + GPIO_INT_LEVEL);
++ __raw_writel(reg_both, base + GPIO_INT_BOTH_EDGE);
++
++ fa_gpio_irq_ack(irq);
++
++ return 0;
++}
++
++static void fa_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
++{
++ struct fa_gpio_data *data = get_irq_data(irq);
++ unsigned int chip;
++
++ for (chip = 0; chip < data->nchips; chip++) {
++ struct fa_gpio_chip *fgc = &data->chips[chip];
++ unsigned int status;
++ unsigned int i;
++
++ status = __raw_readl(fgc->mem_base + GPIO_INT_STAT);
++ for (i = fgc->irq_base; status != 0; status >>= 1, i++) {
++ if ((status & 1) == 0)
++ continue;
++
++ BUG_ON(!(irq_desc[i].handle_irq));
++ irq_desc[i].handle_irq(i, &irq_desc[i]);
++ }
++ }
++}
++
++static struct irq_chip fa_gpio_irq_chip = {
++ .name = "GPIO",
++ .ack = fa_gpio_irq_ack,
++ .mask = fa_gpio_irq_mask,
++ .unmask = fa_gpio_irq_unmask,
++ .set_type = fa_gpio_irq_set_type,
++};
++
++static void _fa_gpio_set_direction(struct fa_gpio_chip *fgc, unsigned offset,
++ int is_output)
++{
++ unsigned int reg;
++
++ reg = __raw_readl(fgc->mem_base + GPIO_DIR);
++ if (is_output)
++ reg |= 1 << offset;
++ else
++ reg &= ~(1 << offset);
++ __raw_writel(reg, fgc->mem_base + GPIO_DIR);
++}
++
++static void _fa_gpio_set(struct fa_gpio_chip *fgc, unsigned offset, int value)
++{
++ if (value)
++ __raw_writel(1 << offset, fgc->mem_base + GPIO_DATA_SET);
++ else
++ __raw_writel(1 << offset, fgc->mem_base + GPIO_DATA_CLR);
++}
++
++static void fa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
++{
++ struct fa_gpio_chip *fgc = to_fgc(chip);
++
++ _fa_gpio_set(fgc, offset, value);
++}
++
++static int fa_gpio_get(struct gpio_chip *chip, unsigned offset)
++{
++ struct fa_gpio_chip *fgc = to_fgc(chip);
++
++ return (__raw_readl(fgc->mem_base + GPIO_DATA_IN) >> offset) & 1;
++}
++
++static int fa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
++{
++ struct fa_gpio_chip *fgc = to_fgc(chip);
++ unsigned long flags;
++
++ spin_lock_irqsave(&fa_gpio_lock, flags);
++
++ _fa_gpio_set_direction(fgc, offset, 0);
++
++ spin_unlock_irqrestore(&fa_gpio_lock, flags);
++
++ return 0;
++}
++
++static int fa_gpio_direction_output(struct gpio_chip *chip,
++ unsigned offset,
++ int value)
++{
++ struct fa_gpio_chip *fgc = to_fgc(chip);
++ unsigned long flags;
++
++ spin_lock_irqsave(&fa_gpio_lock, flags);
++
++ _fa_gpio_set(fgc, offset, value);
++ _fa_gpio_set_direction(fgc, offset, 1);
++
++ spin_unlock_irqrestore(&fa_gpio_lock, flags);
++
++ return 0;
++}
++
++static int fa_gpio_init_chip(struct fa_gpio_chip *fgc)
++{
++ void __iomem *mem_base;
++ unsigned int i;
++ int err;
++
++ mem_base = ioremap(fgc->map_base, GPIO_REGS_SIZE);
++ if (!mem_base)
++ return -ENXIO;
++
++ fgc->mem_base = mem_base;
++
++ fgc->gpio_chip.direction_input = fa_gpio_direction_input;
++ fgc->gpio_chip.direction_output = fa_gpio_direction_output;
++ fgc->gpio_chip.get = fa_gpio_get;
++ fgc->gpio_chip.set = fa_gpio_set;
++
++ /* disable, unmask and clear all interrupts */
++ __raw_writel(0x0, mem_base + GPIO_INT_EN);
++ __raw_writel(0x0, mem_base + GPIO_INT_MASK);
++ __raw_writel(~0x0, mem_base + GPIO_INT_CLR);
++
++ for (i = fgc->irq_base;
++ i < fgc->irq_base + fgc->gpio_chip.ngpio; i++) {
++ set_irq_chip(i, &fa_gpio_irq_chip);
++ set_irq_chip_data(i, fgc);
++ set_irq_handler(i, handle_edge_irq);
++ set_irq_flags(i, IRQF_VALID);
++ }
++
++ err = gpiochip_add(&fgc->gpio_chip);
++ if (err)
++ goto unmap;
++
++ return 0;
++
++ unmap:
++ iounmap(fgc->mem_base);
++ return err;
++}
++
++void __init fa_gpio_init(struct fa_gpio_data *data)
++{
++ unsigned int i;
++
++ for (i = 0; i < data->nchips; i++) {
++ int err;
++
++ err = fa_gpio_init_chip(&data->chips[i]);
++ if (WARN(err, "GPIO init failed\n"))
++ return;
++ }
++
++ set_irq_chained_handler(data->irq, fa_gpio_irq_handler);
++ set_irq_data(data->irq, data);
++}
+--- /dev/null
++++ b/arch/arm/plat-fa/include/plat/gpio.h
+@@ -0,0 +1,33 @@
++/*
++ * Copyright (c) 2010 Gabor Juhos <juhosg@openwrt.org>
++ *
++ * This file 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.
++ */
++
++#ifndef _FA_GPIO_H
++#define _FA_GPIO_H
++
++#include <linux/init.h>
++#include <linux/gpio.h>
++#include <linux/irq.h>
++#include <linux/io.h>
++
++struct fa_gpio_chip {
++ struct gpio_chip gpio_chip;
++ unsigned int map_base;
++ unsigned int irq_base;
++
++ void __iomem *mem_base;
++};
++
++struct fa_gpio_data {
++ struct fa_gpio_chip *chips;
++ unsigned int nchips;
++ unsigned int irq;
++};
++
++void __init fa_gpio_init(struct fa_gpio_data *data);
++
++#endif /* _FA_GPIO_H */
+--- a/arch/arm/plat-fa/Kconfig
++++ b/arch/arm/plat-fa/Kconfig
+@@ -1,5 +1,8 @@
+ if PLAT_FA
+
++config PLAT_FA_GPIO
++ def_bool n
++
+ config PLAT_FA_TIME
+ def_bool n
+
+--- a/arch/arm/plat-fa/Makefile
++++ b/arch/arm/plat-fa/Makefile
+@@ -4,6 +4,7 @@
+
+ obj-y :=
+
++obj-$(CONFIG_PLAT_FA_GPIO) += gpio.o
+ obj-$(CONFIG_PLAT_FA_TIME) += time.o
+
+ obj-m :=