--- /dev/null
+From cf908990d4a8ccdb73ee4484aa8cadad379ca314 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Sun, 30 Nov 2014 14:54:27 +0100
+Subject: [PATCH 2/5] irqchip: add support for bcm6345-style external
+ interrupt controller
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ .../interrupt-controller/brcm,bcm6345-ext-intc.txt | 29 ++
+ drivers/irqchip/Kconfig | 4 +
+ drivers/irqchip/Makefile | 1 +
+ drivers/irqchip/irq-bcm6345-ext.c | 287 ++++++++++++++++++++
+ include/linux/irqchip/irq-bcm6345-ext.h | 14 +
+ 5 files changed, 335 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-ext-intc.txt
+ create mode 100644 drivers/irqchip/irq-bcm6345-ext.c
+ create mode 100644 include/linux/irqchip/irq-bcm6345-ext.h
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-ext-intc.txt
+@@ -0,0 +1,29 @@
++Broadcom BCM6345-style external interrupt controller
++
++Required properties:
++
++- compatible: Should be "brcm,bcm6345-ext-intc".
++- reg: Specifies the base physical addresses and size of the registers.
++- interrupt-controller: identifies the node as an interrupt controller.
++- #interrupt-cells: Specifies the number of cells needed to encode an interrupt
++ source, Should be 2.
++- interrupt-parent: Specifies the phandle to the parent interrupt controller
++ this one is cascaded from.
++- interrupts: Specifies the interrupt line(s) in the interrupt-parent controller
++ node, valid values depend on the type of parent interrupt controller.
++
++Optional properties:
++
++- brcm,field-width: Size of each field (mask, clear, sense, ...) in bits in the
++ register. Defaults to 4.
++
++Example:
++
++ext_intc: interrupt-controller@10000018 {
++ compatible = "brcm,bcm6345-ext-intc";
++ interrupt-parent = <&periph_intc>;
++ #interrupt-cells = <2>;
++ reg = <0x10000018 0x4>;
++ interrupt-controller;
++ interrupts = <24>, <25>, <26>, <27>;
++};
+--- a/drivers/irqchip/Kconfig
++++ b/drivers/irqchip/Kconfig
+@@ -80,6 +80,10 @@ config BRCMSTB_L2_IRQ
+ select GENERIC_IRQ_CHIP
+ select IRQ_DOMAIN
+
++config BCM6345_EXT_IRQ
++ bool
++ select IRQ_DOMAIN
++
+ config BCM6345_PERIPH_IRQ
+ bool
+ select IRQ_DOMAIN
+--- a/drivers/irqchip/Makefile
++++ b/drivers/irqchip/Makefile
+@@ -9,6 +9,7 @@ obj-$(CONFIG_ARCH_MVEBU) += irq-armada-
+ obj-$(CONFIG_IRQ_MXS) += irq-mxs.o
+ obj-$(CONFIG_ARCH_TEGRA) += irq-tegra.o
+ obj-$(CONFIG_ARCH_S3C24XX) += irq-s3c24xx.o
++obj-$(CONFIG_BCM6345_EXT_IRQ) += irq-bcm6345-ext.o
+ obj-$(CONFIG_BCM6345_PERIPH_IRQ) += irq-bcm6345-periph.o
+ obj-$(CONFIG_DW_APB_ICTL) += irq-dw-apb-ictl.o
+ obj-$(CONFIG_METAG) += irq-metag-ext.o
+--- /dev/null
++++ b/drivers/irqchip/irq-bcm6345-ext.c
+@@ -0,0 +1,288 @@
++/*
++ * This file is subject to the terms and conditions of the GNU General Public
++ * License. See the file "COPYING" in the main directory of this archive
++ * for more details.
++ *
++ * Copyright (C) 2014 Jonas Gorski <jogo@openwrt.org>
++ */
++
++#include <linux/ioport.h>
++#include <linux/irq.h>
++#include <linux/irqchip.h>
++#include <linux/irqchip/chained_irq.h>
++#include <linux/irqchip/irq-bcm6345-ext.h>
++#include <linux/kernel.h>
++#include <linux/of.h>
++#include <linux/of_irq.h>
++#include <linux/of_address.h>
++#include <linux/slab.h>
++#include <linux/spinlock.h>
++
++#ifdef CONFIG_BCM63XX
++#include <asm/mach-bcm63xx/bcm63xx_irq.h>
++
++#define VIRQ_BASE IRQ_EXTERNAL_BASE
++#else
++#define VIRQ_BASE 0
++#endif
++
++#define MAX_IRQS 4
++
++#define EXTIRQ_CFG_SENSE 0
++#define EXTIRQ_CFG_STAT 1
++#define EXTIRQ_CFG_CLEAR 2
++#define EXTIRQ_CFG_MASK 3
++#define EXTIRQ_CFG_BOTHEDGE 4
++#define EXTIRQ_CFG_LEVELSENSE 5
++
++struct intc_data {
++ struct irq_chip chip;
++ struct irq_domain *domain;
++ raw_spinlock_t lock;
++
++ int parent_irq[MAX_IRQS];
++ void __iomem *reg;
++ int shift;
++};
++
++static void bcm6345_ext_intc_irq_handle(struct irq_desc *desc)
++{
++ struct intc_data *data = irq_desc_get_handler_data(desc);
++ struct irq_chip *chip = irq_desc_get_chip(desc);
++ unsigned int irq = irq_desc_get_irq(desc);
++ unsigned int idx;
++
++ chained_irq_enter(chip, desc);
++
++ for (idx = 0; idx < MAX_IRQS; idx++) {
++ if (data->parent_irq[idx] != irq)
++ continue;
++
++ generic_handle_irq(irq_find_mapping(data->domain, idx));
++ }
++
++ chained_irq_exit(chip, desc);
++}
++
++static void bcm6345_ext_intc_irq_ack(struct irq_data *data)
++{
++ struct intc_data *priv = data->domain->host_data;
++ irq_hw_number_t hwirq = irqd_to_hwirq(data);
++ u32 reg;
++
++ raw_spin_lock(&priv->lock);
++ reg = __raw_readl(priv->reg);
++ reg |= hwirq << (EXTIRQ_CFG_CLEAR * priv->shift);
++ __raw_writel(reg, priv->reg);
++ raw_spin_unlock(&priv->lock);
++}
++
++static void bcm6345_ext_intc_irq_mask(struct irq_data *data)
++{
++ struct intc_data *priv = data->domain->host_data;
++ irq_hw_number_t hwirq = irqd_to_hwirq(data);
++ u32 reg;
++
++ raw_spin_lock(&priv->lock);
++ reg = __raw_readl(priv->reg);
++ reg &= ~(hwirq << (EXTIRQ_CFG_MASK * priv->shift));
++ __raw_writel(reg, priv->reg);
++ raw_spin_unlock(&priv->lock);
++}
++
++static void bcm6345_ext_intc_irq_unmask(struct irq_data *data)
++{
++ struct intc_data *priv = data->domain->host_data;
++ irq_hw_number_t hwirq = irqd_to_hwirq(data);
++ u32 reg;
++
++ raw_spin_lock(&priv->lock);
++ reg = __raw_readl(priv->reg);
++ reg |= hwirq << (EXTIRQ_CFG_MASK * priv->shift);
++ __raw_writel(reg, priv->reg);
++ raw_spin_unlock(&priv->lock);
++}
++
++static int bcm6345_ext_intc_set_type(struct irq_data *data,
++ unsigned int flow_type)
++{
++ struct intc_data *priv = data->domain->host_data;
++ irq_hw_number_t hwirq = irqd_to_hwirq(data);
++ bool levelsense = 0, sense = 0, bothedge = 0;
++ u32 reg;
++
++ flow_type &= IRQ_TYPE_SENSE_MASK;
++
++ if (flow_type == IRQ_TYPE_NONE)
++ flow_type = IRQ_TYPE_LEVEL_LOW;
++
++ switch (flow_type) {
++ case IRQ_TYPE_EDGE_BOTH:
++ bothedge = 1;
++ break;
++
++ case IRQ_TYPE_EDGE_RISING:
++ break;
++
++ case IRQ_TYPE_EDGE_FALLING:
++ sense = 1;
++ break;
++
++ case IRQ_TYPE_LEVEL_HIGH:
++ levelsense = 1;
++ sense = 1;
++ break;
++
++ case IRQ_TYPE_LEVEL_LOW:
++ levelsense = 1;
++ break;
++
++ default:
++ pr_err("bogus flow type combination given!\n");
++ return -EINVAL;
++ }
++
++ raw_spin_lock(&priv->lock);
++ reg = __raw_readl(priv->reg);
++
++ if (levelsense)
++ reg |= hwirq << (EXTIRQ_CFG_LEVELSENSE * priv->shift);
++ else
++ reg &= ~(hwirq << (EXTIRQ_CFG_LEVELSENSE * priv->shift));
++ if (sense)
++ reg |= hwirq << (EXTIRQ_CFG_SENSE * priv->shift);
++ else
++ reg &= ~(hwirq << (EXTIRQ_CFG_SENSE * priv->shift));
++ if (bothedge)
++ reg |= hwirq << (EXTIRQ_CFG_BOTHEDGE * priv->shift);
++ else
++ reg &= ~(hwirq << (EXTIRQ_CFG_BOTHEDGE * priv->shift));
++
++ __raw_writel(reg, priv->reg);
++ raw_spin_unlock(&priv->lock);
++
++ irqd_set_trigger_type(data, flow_type);
++ if (flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
++ irq_set_handler_locked(data, handle_level_irq);
++ else
++ irq_set_handler_locked(data, handle_edge_irq);
++
++ return 0;
++}
++
++static int bcm6345_ext_intc_map(struct irq_domain *d, unsigned int irq,
++ irq_hw_number_t hw)
++{
++ struct intc_data *priv = d->host_data;
++
++ irq_set_chip_and_handler(irq, &priv->chip, handle_level_irq);
++
++ return 0;
++}
++
++static const struct irq_domain_ops bcm6345_ext_domain_ops = {
++ .xlate = irq_domain_xlate_twocell,
++ .map = bcm6345_ext_intc_map,
++};
++
++static int __init __bcm6345_ext_intc_init(struct device_node *node,
++ int num_irqs, int *irqs,
++ void __iomem *reg, int shift)
++{
++ struct intc_data *data;
++ unsigned int i;
++ int start = VIRQ_BASE;
++
++ data = kzalloc(sizeof(*data), GFP_KERNEL);
++ if (!data)
++ return -ENOMEM;
++
++ raw_spin_lock_init(&data->lock);
++
++ for (i = 0; i < num_irqs; i++) {
++ data->parent_irq[i] = irqs[i];
++
++ irq_set_handler_data(irqs[i], data);
++ irq_set_chained_handler(irqs[i], bcm6345_ext_intc_irq_handle);
++ }
++
++ data->reg = reg;
++ data->shift = shift;
++
++ data->chip.name = "bcm6345-ext-intc";
++ data->chip.irq_ack = bcm6345_ext_intc_irq_ack;
++ data->chip.irq_mask = bcm6345_ext_intc_irq_mask;
++ data->chip.irq_unmask = bcm6345_ext_intc_irq_unmask;
++ data->chip.irq_set_type = bcm6345_ext_intc_set_type;
++
++ /*
++ * If we have less than 4 irqs, this is the second controller on
++ * bcm63xx. So increase the VIRQ start to not overlap with the first
++ * one, but only do so if we actually use a non-zero start.
++ *
++ * This can be removed when bcm63xx has no legacy users anymore.
++ */
++ if (start && num_irqs < 4)
++ start += 4;
++
++ data->domain = irq_domain_add_simple(node, num_irqs, start,
++ &bcm6345_ext_domain_ops, data);
++ if (!data->domain) {
++ kfree(data);
++ return -ENOMEM;
++ }
++
++ return 0;
++}
++
++void __init bcm6345_ext_intc_init(int num_irqs, int *irqs, void __iomem *reg,
++ int shift)
++{
++ __bcm6345_ext_intc_init(NULL, num_irqs, irqs, reg, shift);
++}
++
++#ifdef CONFIG_OF
++static int __init bcm6345_ext_intc_of_init(struct device_node *node,
++ struct device_node *parent)
++{
++ int num_irqs, ret = -EINVAL;
++ unsigned i;
++ void __iomem *base;
++ int irqs[MAX_IRQS] = { 0 };
++ u32 shift;
++
++ num_irqs = of_irq_count(node);
++
++ if (!num_irqs || num_irqs > MAX_IRQS)
++ return -EINVAL;
++
++ if (of_property_read_u32(node, "brcm,field-width", &shift))
++ shift = 4;
++
++ for (i = 0; i < num_irqs; i++) {
++ irqs[i] = irq_of_parse_and_map(node, i);
++ if (!irqs[i]) {
++ ret = -ENOMEM;
++ goto out_unmap;
++ }
++ }
++
++ base = of_iomap(node, 0);
++ if (!base)
++ goto out_unmap;
++
++ ret = __bcm6345_ext_intc_init(node, num_irqs, irqs, base, shift);
++ if (!ret)
++ return 0;
++out_unmap:
++ iounmap(base);
++
++ for (i = 0; i < num_irqs; i++)
++ irq_dispose_mapping(irqs[i]);
++
++ return ret;
++}
++
++IRQCHIP_DECLARE(bcm6345_ext_intc, "brcm,bcm6345-ext-intc",
++ bcm6345_ext_intc_of_init);
++#endif
+--- /dev/null
++++ b/include/linux/irqchip/irq-bcm6345-ext.h
+@@ -0,0 +1,14 @@
++/*
++ * This file is subject to the terms and conditions of the GNU General Public
++ * License. See the file "COPYING" in the main directory of this archive
++ * for more details.
++ *
++ * Copyright (C) 2014 Jonas Gorski <jogo@openwrt.org>
++ */
++
++#ifndef __INCLUDE_LINUX_IRQCHIP_IRQ_BCM6345_EXT_H
++#define __INCLUDE_LINUX_IRQCHIP_IRQ_BCM6345_EXT_H
++
++void bcm6345_ext_intc_init(int n_irqs, int *irqs, void __iomem *reg, int shift);
++
++#endif /* __INCLUDE_LINUX_IRQCHIP_IRQ_BCM6345_EXT_H */
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