drivers/irqchip/irq-mtk-sysirq.c

   1 /*
   2  * Copyright (c) 2014 MediaTek Inc.
   3  * Author: Joe.C <yingjoe.chen@mediatek.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/irq.h>
  16 #include <linux/irqdomain.h>
  17 #include <linux/of.h>
  18 #include <linux/of_irq.h>
  19 #include <linux/of_address.h>
  20 #include <linux/io.h>
  21 #include <linux/slab.h>
  22 #include <linux/spinlock.h>
  23
  24 #include "irqchip.h"
  25
  26 struct mtk_sysirq_chip_data {
  27         spinlock_t lock;
  28         void __iomem *intpol_base;
  29 };
  30
  31 static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
  32 {
  33         irq_hw_number_t hwirq = data->hwirq;
  34         struct mtk_sysirq_chip_data *chip_data = data->chip_data;
  35         u32 offset, reg_index, value;
  36         unsigned long flags;
  37         int ret;
  38
  39         offset = hwirq & 0x1f;
  40         reg_index = hwirq >> 5;
  41
  42         spin_lock_irqsave(&chip_data->lock, flags);
  43         value = readl_relaxed(chip_data->intpol_base + reg_index * 4);
  44         if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
  45                 if (type == IRQ_TYPE_LEVEL_LOW)
  46                         type = IRQ_TYPE_LEVEL_HIGH;
  47                 else
  48                         type = IRQ_TYPE_EDGE_RISING;
  49                 value |= (1 << offset);
  50         } else {
  51                 value &= ~(1 << offset);
  52         }
  53         writel(value, chip_data->intpol_base + reg_index * 4);
  54
  55         data = data->parent_data;
  56         ret = data->chip->irq_set_type(data, type);
  57         spin_unlock_irqrestore(&chip_data->lock, flags);
  58         return ret;
  59 }
  60
  61 static struct irq_chip mtk_sysirq_chip = {
  62         .name                   = "MT_SYSIRQ",
  63         .irq_mask               = irq_chip_mask_parent,
  64         .irq_unmask             = irq_chip_unmask_parent,
  65         .irq_eoi                = irq_chip_eoi_parent,
  66         .irq_set_type           = mtk_sysirq_set_type,
  67         .irq_retrigger          = irq_chip_retrigger_hierarchy,
  68         .irq_set_affinity       = irq_chip_set_affinity_parent,
  69 };
  70
  71 static int mtk_sysirq_domain_xlate(struct irq_domain *d,
  72                                    struct device_node *controller,
  73                                    const u32 *intspec, unsigned int intsize,
  74                                    unsigned long *out_hwirq,
  75                                    unsigned int *out_type)
  76 {
  77         if (intsize != 3)
  78                 return -EINVAL;
  79
  80         /* sysirq doesn't support PPI */
  81         if (intspec[0])
  82                 return -EINVAL;
  83
  84         *out_hwirq = intspec[1];
  85         *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
  86         return 0;
  87 }
  88
  89 static int mtk_sysirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
  90                                    unsigned int nr_irqs, void *arg)
  91 {
  92         int i;
  93         irq_hw_number_t hwirq;
  94         struct of_phandle_args *irq_data = arg;
  95         struct of_phandle_args gic_data = *irq_data;
  96
  97         if (irq_data->args_count != 3)
  98                 return -EINVAL;
  99
 100         /* sysirq doesn't support PPI */
 101         if (irq_data->args[0])
 102                 return -EINVAL;
 103
 104         hwirq = irq_data->args[1];
 105         for (i = 0; i < nr_irqs; i++)
 106                 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
 107                                               &mtk_sysirq_chip,
 108                                               domain->host_data);
 109
 110         gic_data.np = domain->parent->of_node;
 111         return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_data);
 112 }
 113
 114 static struct irq_domain_ops sysirq_domain_ops = {
 115         .xlate = mtk_sysirq_domain_xlate,
 116         .alloc = mtk_sysirq_domain_alloc,
 117         .free = irq_domain_free_irqs_common,
 118 };
 119
 120 static int __init mtk_sysirq_of_init(struct device_node *node,
 121                                      struct device_node *parent)
 122 {
 123         struct irq_domain *domain, *domain_parent;
 124         struct mtk_sysirq_chip_data *chip_data;
 125         int ret, size, intpol_num;
 126         struct resource res;
 127
 128         domain_parent = irq_find_host(parent);
 129         if (!domain_parent) {
 130                 pr_err("mtk_sysirq: interrupt-parent not found\n");
 131                 return -EINVAL;
 132         }
 133
 134         ret = of_address_to_resource(node, 0, &res);
 135         if (ret)
 136                 return ret;
 137
 138         chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
 139         if (!chip_data)
 140                 return -ENOMEM;
 141
 142         size = resource_size(&res);
 143         intpol_num = size * 8;
 144         chip_data->intpol_base = ioremap(res.start, size);
 145         if (!chip_data->intpol_base) {
 146                 pr_err("mtk_sysirq: unable to map sysirq register\n");
 147                 ret = PTR_ERR(chip_data->intpol_base);
 148                 goto out_free;
 149         }
 150
 151         domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node,
 152                                           &sysirq_domain_ops, chip_data);
 153         if (!domain) {
 154                 ret = -ENOMEM;
 155                 goto out_unmap;
 156         }
 157         spin_lock_init(&chip_data->lock);
 158
 159         return 0;
 160
 161 out_unmap:
 162         iounmap(chip_data->intpol_base);
 163 out_free:
 164         kfree(chip_data);
 165         return ret;
 166 }
 167 IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init);