280 lines
6.9 KiB
C
280 lines
6.9 KiB
C
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/*
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* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Combiner irqchip for EXYNOS
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/syscore_ops.h>
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#include <linux/irqdomain.h>
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#include <linux/irqchip.h>
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#include <linux/irqchip/chained_irq.h>
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#include <linux/interrupt.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#define COMBINER_ENABLE_SET 0x0
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#define COMBINER_ENABLE_CLEAR 0x4
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#define COMBINER_INT_STATUS 0xC
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#define IRQ_IN_COMBINER 8
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static DEFINE_SPINLOCK(irq_controller_lock);
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struct combiner_chip_data {
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unsigned int hwirq_offset;
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unsigned int irq_mask;
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void __iomem *base;
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unsigned int parent_irq;
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#ifdef CONFIG_PM
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u32 pm_save;
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#endif
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};
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static struct combiner_chip_data *combiner_data;
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static struct irq_domain *combiner_irq_domain;
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static unsigned int max_nr = 20;
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static inline void __iomem *combiner_base(struct irq_data *data)
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{
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struct combiner_chip_data *combiner_data =
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irq_data_get_irq_chip_data(data);
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return combiner_data->base;
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}
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static void combiner_mask_irq(struct irq_data *data)
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{
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u32 mask = 1 << (data->hwirq % 32);
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writel_relaxed(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
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}
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static void combiner_unmask_irq(struct irq_data *data)
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{
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u32 mask = 1 << (data->hwirq % 32);
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writel_relaxed(mask, combiner_base(data) + COMBINER_ENABLE_SET);
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}
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static void combiner_handle_cascade_irq(struct irq_desc *desc)
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{
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struct combiner_chip_data *chip_data = irq_desc_get_handler_data(desc);
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struct irq_chip *chip = irq_desc_get_chip(desc);
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unsigned int cascade_irq, combiner_irq;
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unsigned long status;
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chained_irq_enter(chip, desc);
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spin_lock(&irq_controller_lock);
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status = readl_relaxed(chip_data->base + COMBINER_INT_STATUS);
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spin_unlock(&irq_controller_lock);
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status &= chip_data->irq_mask;
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if (status == 0)
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goto out;
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combiner_irq = chip_data->hwirq_offset + __ffs(status);
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cascade_irq = irq_find_mapping(combiner_irq_domain, combiner_irq);
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if (unlikely(!cascade_irq))
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handle_bad_irq(desc);
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else
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generic_handle_irq(cascade_irq);
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out:
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chained_irq_exit(chip, desc);
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}
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#ifdef CONFIG_SMP
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static int combiner_set_affinity(struct irq_data *d,
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const struct cpumask *mask_val, bool force)
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{
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struct combiner_chip_data *chip_data = irq_data_get_irq_chip_data(d);
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struct irq_chip *chip = irq_get_chip(chip_data->parent_irq);
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struct irq_data *data = irq_get_irq_data(chip_data->parent_irq);
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if (chip && chip->irq_set_affinity)
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return chip->irq_set_affinity(data, mask_val, force);
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else
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return -EINVAL;
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}
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#endif
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static struct irq_chip combiner_chip = {
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.name = "COMBINER",
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.irq_mask = combiner_mask_irq,
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.irq_unmask = combiner_unmask_irq,
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#ifdef CONFIG_SMP
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.irq_set_affinity = combiner_set_affinity,
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#endif
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};
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static void __init combiner_cascade_irq(struct combiner_chip_data *combiner_data,
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unsigned int irq)
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{
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irq_set_chained_handler_and_data(irq, combiner_handle_cascade_irq,
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combiner_data);
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}
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static void __init combiner_init_one(struct combiner_chip_data *combiner_data,
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unsigned int combiner_nr,
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void __iomem *base, unsigned int irq)
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{
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combiner_data->base = base;
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combiner_data->hwirq_offset = (combiner_nr & ~3) * IRQ_IN_COMBINER;
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combiner_data->irq_mask = 0xff << ((combiner_nr % 4) << 3);
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combiner_data->parent_irq = irq;
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/* Disable all interrupts */
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writel_relaxed(combiner_data->irq_mask, base + COMBINER_ENABLE_CLEAR);
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}
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static int combiner_irq_domain_xlate(struct irq_domain *d,
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struct device_node *controller,
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const u32 *intspec, unsigned int intsize,
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unsigned long *out_hwirq,
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unsigned int *out_type)
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{
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if (irq_domain_get_of_node(d) != controller)
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return -EINVAL;
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if (intsize < 2)
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return -EINVAL;
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*out_hwirq = intspec[0] * IRQ_IN_COMBINER + intspec[1];
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*out_type = 0;
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return 0;
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}
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static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
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irq_hw_number_t hw)
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{
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struct combiner_chip_data *combiner_data = d->host_data;
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irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq);
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irq_set_chip_data(irq, &combiner_data[hw >> 3]);
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irq_set_probe(irq);
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return 0;
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}
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static const struct irq_domain_ops combiner_irq_domain_ops = {
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.xlate = combiner_irq_domain_xlate,
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.map = combiner_irq_domain_map,
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};
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static void __init combiner_init(void __iomem *combiner_base,
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struct device_node *np)
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{
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int i, irq;
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unsigned int nr_irq;
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nr_irq = max_nr * IRQ_IN_COMBINER;
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combiner_data = kcalloc(max_nr, sizeof (*combiner_data), GFP_KERNEL);
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if (!combiner_data) {
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pr_warn("%s: could not allocate combiner data\n", __func__);
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return;
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}
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combiner_irq_domain = irq_domain_add_linear(np, nr_irq,
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&combiner_irq_domain_ops, combiner_data);
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if (WARN_ON(!combiner_irq_domain)) {
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pr_warn("%s: irq domain init failed\n", __func__);
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return;
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}
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for (i = 0; i < max_nr; i++) {
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irq = irq_of_parse_and_map(np, i);
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combiner_init_one(&combiner_data[i], i,
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combiner_base + (i >> 2) * 0x10, irq);
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combiner_cascade_irq(&combiner_data[i], irq);
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}
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}
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#ifdef CONFIG_PM
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/**
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* combiner_suspend - save interrupt combiner state before suspend
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*
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* Save the interrupt enable set register for all combiner groups since
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* the state is lost when the system enters into a sleep state.
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*
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*/
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static int combiner_suspend(void)
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{
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int i;
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for (i = 0; i < max_nr; i++)
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combiner_data[i].pm_save =
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readl_relaxed(combiner_data[i].base + COMBINER_ENABLE_SET);
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return 0;
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}
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/**
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* combiner_resume - restore interrupt combiner state after resume
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*
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* Restore the interrupt enable set register for all combiner groups since
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* the state is lost when the system enters into a sleep state on suspend.
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*
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*/
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static void combiner_resume(void)
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{
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int i;
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for (i = 0; i < max_nr; i++) {
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writel_relaxed(combiner_data[i].irq_mask,
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combiner_data[i].base + COMBINER_ENABLE_CLEAR);
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writel_relaxed(combiner_data[i].pm_save,
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combiner_data[i].base + COMBINER_ENABLE_SET);
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}
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}
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#else
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#define combiner_suspend NULL
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#define combiner_resume NULL
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#endif
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static struct syscore_ops combiner_syscore_ops = {
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.suspend = combiner_suspend,
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.resume = combiner_resume,
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};
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static int __init combiner_of_init(struct device_node *np,
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struct device_node *parent)
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{
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void __iomem *combiner_base;
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combiner_base = of_iomap(np, 0);
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if (!combiner_base) {
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pr_err("%s: failed to map combiner registers\n", __func__);
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return -ENXIO;
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}
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if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) {
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pr_info("%s: number of combiners not specified, "
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"setting default as %d.\n",
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__func__, max_nr);
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}
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combiner_init(combiner_base, np);
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register_syscore_ops(&combiner_syscore_ops);
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return 0;
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}
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IRQCHIP_DECLARE(exynos4210_combiner, "samsung,exynos4210-combiner",
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combiner_of_init);
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