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Diffstat (limited to 'target/linux/brcm63xx/patches-3.18/320-irqchip-add-support-for-bcm6345-style-periphery-irq-.patch')
-rw-r--r--target/linux/brcm63xx/patches-3.18/320-irqchip-add-support-for-bcm6345-style-periphery-irq-.patch455
1 files changed, 455 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.18/320-irqchip-add-support-for-bcm6345-style-periphery-irq-.patch b/target/linux/brcm63xx/patches-3.18/320-irqchip-add-support-for-bcm6345-style-periphery-irq-.patch
new file mode 100644
index 0000000..11eedf9
--- /dev/null
+++ b/target/linux/brcm63xx/patches-3.18/320-irqchip-add-support-for-bcm6345-style-periphery-irq-.patch
@@ -0,0 +1,455 @@
+From 301744ecbeece89ab3a9d6beef7802fa22598f00 Mon Sep 17 00:00:00 2001
+From: Jonas Gorski <jogo@openwrt.org>
+Date: Sun, 30 Nov 2014 14:53:12 +0100
+Subject: [PATCH 1/5] irqchip: add support for bcm6345-style periphery irq
+ controller
+
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ .../brcm,bcm6345-periph-intc.txt | 50 +++
+ drivers/irqchip/Kconfig | 4 +
+ drivers/irqchip/Makefile | 1 +
+ drivers/irqchip/irq-bcm6345-periph.c | 339 ++++++++++++++++++++
+ include/linux/irqchip/irq-bcm6345-periph.h | 16 +
+ 5 files changed, 410 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-periph-intc.txt
+ create mode 100644 drivers/irqchip/irq-bcm6345-periph.c
+ create mode 100644 include/linux/irqchip/irq-bcm6345-periph.h
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-periph-intc.txt
+@@ -0,0 +1,50 @@
++Broadcom BCM6345 Level 1 periphery interrupt controller
++
++This block is a interrupt controller that is typically connected directly
++to one of the HW INT lines on each CPU. Every BCM63XX xDSL chip since
++BCM6345 has contained this hardware.
++
++Key elements of the hardware design include:
++
++- 32, 64, or 128 incoming level IRQ lines
++
++- All onchip peripherals are wired directly to an L2 input
++
++- A separate instance of the register set for each CPU, allowing individual
++ peripheral IRQs to be routed to any CPU
++
++- No atomic mask/unmask operations
++
++- No polarity/level/edge settings
++
++- No FIFO or priority encoder logic; software is expected to read all
++ 1-4 status words to determine which IRQs are pending
++
++Required properties:
++
++- compatible: Should be "brcm,bcm6345-periph-intc".
++- reg: Specifies the base physical address and size of the registers.
++ Multiple register addresses may be specified, and must match the amount of
++ parent interrupts.
++- interrupt-controller: Identifies the node as an interrupt controller.
++- #interrupt-cells: Specifies the number of cells needed to encode an interrupt
++ source, should be 1.
++- 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.
++ Multiple lines are used to route interrupts to different cpus, with the first
++ assumed to be for the boot CPU.
++
++Example:
++
++periph_intc: interrupt-controller@f0406800 {
++ compatible = "brcm,bcm6345-periph-intc";
++ reg = <0x10000020 0x10>, <0x10000030 0x10>;
++
++ interrupt-controller;
++ #interrupt-cells = <1>;
++
++ interrupt-parent = <&cpu_intc>;
++ interrupts = <2>, <3>;
++};
+--- a/drivers/irqchip/Kconfig
++++ b/drivers/irqchip/Kconfig
+@@ -54,6 +54,10 @@ config BRCMSTB_L2_IRQ
+ select GENERIC_IRQ_CHIP
+ select IRQ_DOMAIN
+
++config BCM6345_PERIPH_IRQ
++ bool
++ select IRQ_DOMAIN
++
+ config DW_APB_ICTL
+ bool
+ select IRQ_DOMAIN
+--- a/drivers/irqchip/Makefile
++++ b/drivers/irqchip/Makefile
+@@ -7,6 +7,7 @@ obj-$(CONFIG_ARCH_MMP) += irq-mmp.o
+ obj-$(CONFIG_ARCH_MVEBU) += irq-armada-370-xp.o
+ obj-$(CONFIG_ARCH_MXS) += irq-mxs.o
+ obj-$(CONFIG_ARCH_S3C24XX) += irq-s3c24xx.o
++obj-$(CONFIG_BCM6345_PERIPH_IRQ) += irq-bcm6345-periph.o
+ obj-$(CONFIG_DW_APB_ICTL) += irq-dw-apb-ictl.o
+ obj-$(CONFIG_METAG) += irq-metag-ext.o
+ obj-$(CONFIG_METAG_PERFCOUNTER_IRQS) += irq-metag.o
+--- /dev/null
++++ b/drivers/irqchip/irq-bcm6345-periph.c
+@@ -0,0 +1,339 @@
++/*
++ * 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/chained_irq.h>
++#include <linux/irqchip/irq-bcm6345-periph.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_INTERNAL_BASE
++#else
++#define VIRQ_BASE 0
++#endif
++
++#include "irqchip.h"
++
++#define MAX_WORDS 4
++#define MAX_PARENT_IRQS 2
++#define IRQS_PER_WORD 32
++
++struct intc_block {
++ int parent_irq;
++ void __iomem *base;
++ void __iomem *en_reg[MAX_WORDS];
++ void __iomem *status_reg[MAX_WORDS];
++ u32 mask_cache[MAX_WORDS];
++};
++
++struct intc_data {
++ struct irq_chip chip;
++ struct intc_block block[MAX_PARENT_IRQS];
++
++ int num_words;
++
++ struct irq_domain *domain;
++ raw_spinlock_t lock;
++};
++
++static void bcm6345_periph_irq_handle(unsigned int irq, struct irq_desc *desc)
++{
++ struct intc_data *data = irq_desc_get_handler_data(desc);
++ struct irq_chip *chip = irq_desc_get_chip(desc);
++ struct intc_block *block;
++ unsigned int idx;
++
++ chained_irq_enter(chip, desc);
++
++ for (idx = 0; idx < MAX_PARENT_IRQS; idx++)
++ if (irq == data->block[idx].parent_irq)
++ block = &data->block[idx];
++
++ for (idx = 0; idx < data->num_words; idx++) {
++ int base = idx * IRQS_PER_WORD;
++ unsigned long pending;
++ int hw_irq;
++
++ raw_spin_lock(&data->lock);
++ pending = __raw_readl(block->en_reg[idx]) &
++ __raw_readl(block->status_reg[idx]);
++ raw_spin_unlock(&data->lock);
++
++ for_each_set_bit(hw_irq, &pending, IRQS_PER_WORD) {
++ int virq;
++
++ virq = irq_find_mapping(data->domain, base + hw_irq);
++ generic_handle_irq(virq);
++ }
++ }
++
++ chained_irq_exit(chip, desc);
++}
++
++static void __bcm6345_periph_enable(struct intc_block *block, int reg, int bit,
++ bool enable)
++{
++ u32 val;
++
++ val = __raw_readl(block->en_reg[reg]);
++ if (enable)
++ val |= BIT(bit);
++ else
++ val &= ~BIT(bit);
++ __raw_writel(val, block->en_reg[reg]);
++}
++
++static void bcm6345_periph_irq_mask(struct irq_data *data)
++{
++ unsigned int i, reg, bit;
++ struct intc_data *priv = data->domain->host_data;
++ irq_hw_number_t hwirq = irqd_to_hwirq(data);
++
++ reg = hwirq / IRQS_PER_WORD;
++ bit = hwirq % IRQS_PER_WORD;
++
++ raw_spin_lock(&priv->lock);
++ for (i = 0; i < MAX_PARENT_IRQS; i++) {
++ struct intc_block *block = &priv->block[i];
++
++ if (!block->parent_irq)
++ break;
++
++ __bcm6345_periph_enable(block, reg, bit, false);
++ }
++ raw_spin_unlock(&priv->lock);
++}
++
++static void bcm6345_periph_irq_unmask(struct irq_data *data)
++{
++ struct intc_data *priv = data->domain->host_data;
++ irq_hw_number_t hwirq = irqd_to_hwirq(data);
++ unsigned int i, reg, bit;
++
++ reg = hwirq / IRQS_PER_WORD;
++ bit = hwirq % IRQS_PER_WORD;
++
++ raw_spin_lock(&priv->lock);
++ for (i = 0; i < MAX_PARENT_IRQS; i++) {
++ struct intc_block *block = &priv->block[i];
++
++ if (!block->parent_irq)
++ break;
++
++ if (block->mask_cache[reg] & BIT(bit))
++ __bcm6345_periph_enable(block, reg, bit, true);
++ else
++ __bcm6345_periph_enable(block, reg, bit, false);
++ }
++ raw_spin_unlock(&priv->lock);
++}
++
++#ifdef CONFIG_SMP
++static int bcm6345_periph_set_affinity(struct irq_data *data,
++ const struct cpumask *mask, bool force)
++{
++ irq_hw_number_t hwirq = irqd_to_hwirq(data);
++ struct intc_data *priv = data->domain->host_data;
++ unsigned int i, reg, bit;
++ unsigned long flags;
++ bool enabled;
++ int cpu;
++
++ reg = hwirq / IRQS_PER_WORD;
++ bit = hwirq % IRQS_PER_WORD;
++
++ /* we could route to more than one cpu, but performance
++ suffers, so fix it to one.
++ */
++ cpu = cpumask_any_and(mask, cpu_online_mask);
++ if (cpu >= nr_cpu_ids)
++ return -EINVAL;
++
++ if (cpu >= MAX_PARENT_IRQS)
++ return -EINVAL;
++
++ if (!priv->block[cpu].parent_irq)
++ return -EINVAL;
++
++ raw_spin_lock_irqsave(&priv->lock, flags);
++ enabled = !irqd_irq_masked(data);
++ for (i = 0; i < MAX_PARENT_IRQS; i++) {
++ struct intc_block *block = &priv->block[i];
++
++ if (!block->parent_irq)
++ break;
++
++ if (i == cpu) {
++ block->mask_cache[reg] |= BIT(bit);
++ __bcm6345_periph_enable(block, reg, bit, enabled);
++ } else {
++ block->mask_cache[reg] &= ~BIT(bit);
++ __bcm6345_periph_enable(block, reg, bit, false);
++ }
++ }
++ raw_spin_unlock_irqrestore(&priv->lock, flags);
++
++ return 0;
++}
++#endif
++
++static int bcm6345_periph_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_periph_domain_ops = {
++ .xlate = irq_domain_xlate_onecell,
++ .map = bcm6345_periph_map,
++};
++
++static int __init __bcm6345_periph_intc_init(struct device_node *node,
++ int num_blocks, int *irq,
++ void __iomem **base, int num_words)
++{
++ struct intc_data *data;
++ unsigned int i, w, status_offset;
++
++ data = kzalloc(sizeof(*data), GFP_KERNEL);
++ if (!data)
++ return -ENOMEM;
++
++ raw_spin_lock_init(&data->lock);
++
++ status_offset = num_words * sizeof(u32);
++
++ for (i = 0; i < num_blocks; i++) {
++ struct intc_block *block = &data->block[i];
++
++ block->parent_irq = irq[i];
++ block->base = base[i];
++
++ for (w = 0; w < num_words; w++) {
++ int word_offset = sizeof(u32) * ((num_words - w) - 1);
++
++ block->en_reg[w] = base[i] + word_offset;
++ block->status_reg[w] = base[i] + status_offset;
++ block->status_reg[w] += word_offset;
++
++ /* route all interrupts to line 0 by default */
++ if (i == 0)
++ block->mask_cache[w] = 0xffffffff;
++ }
++
++ irq_set_handler_data(block->parent_irq, data);
++ irq_set_chained_handler(block->parent_irq,
++ bcm6345_periph_irq_handle);
++ }
++
++ data->num_words = num_words;
++
++ data->chip.name = "bcm6345-periph-intc";
++ data->chip.irq_mask = bcm6345_periph_irq_mask;
++ data->chip.irq_unmask = bcm6345_periph_irq_unmask;
++
++#ifdef CONFIG_SMP
++ if (num_blocks > 1)
++ data->chip.irq_set_affinity = bcm6345_periph_set_affinity;
++#endif
++
++ data->domain = irq_domain_add_simple(node, IRQS_PER_WORD * num_words,
++ VIRQ_BASE,
++ &bcm6345_periph_domain_ops, data);
++ if (!data->domain) {
++ kfree(data);
++ return -EINVAL;
++ }
++
++ return 0;
++}
++
++void __init bcm6345_periph_intc_init(int num_blocks, int *irq,
++ void __iomem **base, int num_words)
++{
++ __bcm6345_periph_intc_init(NULL, num_blocks, irq, base, num_words);
++}
++
++#ifdef CONFIG_OF
++static int __init bcm6345_periph_of_init(struct device_node *node,
++ struct device_node *parent)
++{
++ struct resource res;
++ int num_irqs, ret = -EINVAL;
++ int irqs[MAX_PARENT_IRQS] = { 0 };
++ void __iomem *bases[MAX_PARENT_IRQS] = { NULL };
++ int words = 0;
++ int i;
++
++ num_irqs = of_irq_count(node);
++
++ if (num_irqs < 1 || num_irqs > MAX_PARENT_IRQS)
++ return -EINVAL;
++
++ for (i = 0; i < num_irqs; i++) {
++ resource_size_t size;
++
++ irqs[i] = irq_of_parse_and_map(node, i);
++ if (!irqs[i])
++ goto out_unmap;
++
++ if (of_address_to_resource(node, i, &res))
++ goto out_unmap;
++
++ size = resource_size(&res);
++ switch (size) {
++ case 8:
++ case 16:
++ case 32:
++ size = size / 8;
++ break;
++ default:
++ goto out_unmap;
++ }
++
++ if (words && words != size) {
++ ret = -EINVAL;
++ goto out_unmap;
++ }
++ words = size;
++
++ bases[i] = of_iomap(node, i);
++ if (!bases[i]) {
++ ret = -ENOMEM;
++ goto out_unmap;
++ }
++ }
++
++ ret = __bcm6345_periph_intc_init(node, num_irqs, irqs, bases, words);
++ if (!ret)
++ return 0;
++
++out_unmap:
++ for (i = 0; i < num_irqs; i++) {
++ iounmap(bases[i]);
++ irq_dispose_mapping(irqs[i]);
++ }
++
++ return ret;
++}
++
++IRQCHIP_DECLARE(bcm6345_periph_intc, "brcm,bcm6345-periph-intc",
++ bcm6345_periph_of_init);
++#endif
+--- /dev/null
++++ b/include/linux/irqchip/irq-bcm6345-periph.h
+@@ -0,0 +1,16 @@
++/*
++ * 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) 2008 Maxime Bizon <mbizon@freebox.fr>
++ * Copyright (C) 2008 Nicolas Schichan <nschichan@freebox.fr>
++ */
++
++#ifndef __INCLUDE_LINUX_IRQCHIP_IRQ_BCM6345_PERIPH_H
++#define __INCLUDE_LINUX_IRQCHIP_IRQ_BCM6345_PERIPH_H
++
++void bcm6345_periph_intc_init(int num_blocks, int *irq, void __iomem **base,
++ int num_words);
++
++#endif /* __INCLUDE_LINUX_IRQCHIP_IRQ_BCM6345_PERIPH_H */
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