2014-11-25 11:04:20 +03:00
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/*
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* Copyright (c) 2014 MediaTek Inc.
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* Author: Joe.C <yingjoe.chen@mediatek.com>
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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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/irq.h>
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2015-07-08 00:11:46 +03:00
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#include <linux/irqchip.h>
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2014-11-25 11:04:20 +03:00
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/of_address.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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struct mtk_sysirq_chip_data {
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spinlock_t lock;
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void __iomem *intpol_base;
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};
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static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
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{
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irq_hw_number_t hwirq = data->hwirq;
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struct mtk_sysirq_chip_data *chip_data = data->chip_data;
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u32 offset, reg_index, value;
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unsigned long flags;
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int ret;
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offset = hwirq & 0x1f;
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reg_index = hwirq >> 5;
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spin_lock_irqsave(&chip_data->lock, flags);
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value = readl_relaxed(chip_data->intpol_base + reg_index * 4);
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if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
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if (type == IRQ_TYPE_LEVEL_LOW)
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type = IRQ_TYPE_LEVEL_HIGH;
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else
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type = IRQ_TYPE_EDGE_RISING;
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value |= (1 << offset);
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} else {
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value &= ~(1 << offset);
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}
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writel(value, chip_data->intpol_base + reg_index * 4);
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data = data->parent_data;
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ret = data->chip->irq_set_type(data, type);
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spin_unlock_irqrestore(&chip_data->lock, flags);
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return ret;
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}
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static struct irq_chip mtk_sysirq_chip = {
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.name = "MT_SYSIRQ",
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.irq_mask = irq_chip_mask_parent,
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.irq_unmask = irq_chip_unmask_parent,
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.irq_eoi = irq_chip_eoi_parent,
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.irq_set_type = mtk_sysirq_set_type,
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.irq_retrigger = irq_chip_retrigger_hierarchy,
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.irq_set_affinity = irq_chip_set_affinity_parent,
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};
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2015-10-13 14:51:33 +03:00
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static int mtk_sysirq_domain_translate(struct irq_domain *d,
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struct irq_fwspec *fwspec,
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unsigned long *hwirq,
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unsigned int *type)
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2014-11-25 11:04:20 +03:00
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{
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2015-10-13 14:51:33 +03:00
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if (is_of_node(fwspec->fwnode)) {
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if (fwspec->param_count != 3)
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return -EINVAL;
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2014-11-25 11:04:20 +03:00
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2015-10-13 14:51:33 +03:00
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/* No PPI should point to this domain */
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if (fwspec->param[0] != 0)
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return -EINVAL;
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*hwirq = fwspec->param[1];
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*type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
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return 0;
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}
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2014-11-25 11:04:20 +03:00
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2015-10-13 14:51:33 +03:00
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return -EINVAL;
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2014-11-25 11:04:20 +03:00
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}
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static int mtk_sysirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs, void *arg)
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{
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int i;
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irq_hw_number_t hwirq;
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2015-10-13 14:51:33 +03:00
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struct irq_fwspec *fwspec = arg;
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struct irq_fwspec gic_fwspec = *fwspec;
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2014-11-25 11:04:20 +03:00
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2015-10-13 14:51:33 +03:00
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if (fwspec->param_count != 3)
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2014-11-25 11:04:20 +03:00
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return -EINVAL;
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/* sysirq doesn't support PPI */
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2015-10-13 14:51:33 +03:00
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if (fwspec->param[0])
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2014-11-25 11:04:20 +03:00
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return -EINVAL;
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2015-10-13 14:51:33 +03:00
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hwirq = fwspec->param[1];
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2014-11-25 11:04:20 +03:00
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for (i = 0; i < nr_irqs; i++)
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irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
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&mtk_sysirq_chip,
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domain->host_data);
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2015-10-13 14:51:33 +03:00
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gic_fwspec.fwnode = domain->parent->fwnode;
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return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_fwspec);
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2014-11-25 11:04:20 +03:00
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}
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2015-04-27 15:54:24 +03:00
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static const struct irq_domain_ops sysirq_domain_ops = {
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2015-10-13 14:51:33 +03:00
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.translate = mtk_sysirq_domain_translate,
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.alloc = mtk_sysirq_domain_alloc,
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.free = irq_domain_free_irqs_common,
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2014-11-25 11:04:20 +03:00
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};
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static int __init mtk_sysirq_of_init(struct device_node *node,
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struct device_node *parent)
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{
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struct irq_domain *domain, *domain_parent;
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struct mtk_sysirq_chip_data *chip_data;
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2015-01-12 12:14:31 +03:00
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int ret, size, intpol_num;
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struct resource res;
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2014-11-25 11:04:20 +03:00
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domain_parent = irq_find_host(parent);
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if (!domain_parent) {
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pr_err("mtk_sysirq: interrupt-parent not found\n");
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return -EINVAL;
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}
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2015-01-12 12:14:31 +03:00
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ret = of_address_to_resource(node, 0, &res);
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if (ret)
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return ret;
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2014-11-25 11:04:20 +03:00
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chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
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if (!chip_data)
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return -ENOMEM;
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2015-01-12 12:14:31 +03:00
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size = resource_size(&res);
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intpol_num = size * 8;
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chip_data->intpol_base = ioremap(res.start, size);
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if (!chip_data->intpol_base) {
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2014-11-25 11:04:20 +03:00
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pr_err("mtk_sysirq: unable to map sysirq register\n");
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2015-05-21 17:57:34 +03:00
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ret = -ENXIO;
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2014-11-25 11:04:20 +03:00
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goto out_free;
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}
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2015-01-12 12:14:31 +03:00
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domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node,
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2014-11-25 11:04:20 +03:00
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&sysirq_domain_ops, chip_data);
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if (!domain) {
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ret = -ENOMEM;
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goto out_unmap;
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}
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spin_lock_init(&chip_data->lock);
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return 0;
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out_unmap:
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iounmap(chip_data->intpol_base);
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out_free:
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kfree(chip_data);
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return ret;
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}
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IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init);
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