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 #define MT6577_SYS_INTPOL_NUM   (224)
  27
  28 struct mtk_sysirq_chip_data {
  29         spinlock_t lock;
  30         void __iomem *intpol_base;
  31 };
  32
  33 static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
  34 {
  35         irq_hw_number_t hwirq = data->hwirq;
  36         struct mtk_sysirq_chip_data *chip_data = data->chip_data;
  37         u32 offset, reg_index, value;
  38         unsigned long flags;
  39         int ret;
  40
  41         offset = hwirq & 0x1f;
  42         reg_index = hwirq >> 5;
  43
  44         spin_lock_irqsave(&chip_data->lock, flags);
  45         value = readl_relaxed(chip_data->intpol_base + reg_index * 4);
  46         if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
  47                 if (type == IRQ_TYPE_LEVEL_LOW)
  48                         type = IRQ_TYPE_LEVEL_HIGH;
  49                 else
  50                         type = IRQ_TYPE_EDGE_RISING;
  51                 value |= (1 << offset);
  52         } else {
  53                 value &= ~(1 << offset);
  54         }
  55         writel(value, chip_data->intpol_base + reg_index * 4);
  56
  57         data = data->parent_data;
  58         ret = data->chip->irq_set_type(data, type);
  59         spin_unlock_irqrestore(&chip_data->lock, flags);
  60         return ret;
  61 }
  62
  63 static struct irq_chip mtk_sysirq_chip = {
  64         .name                   = "MT_SYSIRQ",
  65         .irq_mask               = irq_chip_mask_parent,
  66         .irq_unmask             = irq_chip_unmask_parent,
  67         .irq_eoi                = irq_chip_eoi_parent,
  68         .irq_set_type           = mtk_sysirq_set_type,
  69         .irq_retrigger          = irq_chip_retrigger_hierarchy,
  70         .irq_set_affinity       = irq_chip_set_affinity_parent,
  71 };
  72
  73 static int mtk_sysirq_domain_xlate(struct irq_domain *d,
  74                                    struct device_node *controller,
  75                                    const u32 *intspec, unsigned int intsize,
  76                                    unsigned long *out_hwirq,
  77                                    unsigned int *out_type)
  78 {
  79         if (intsize != 3)
  80                 return -EINVAL;
  81
  82         /* sysirq doesn't support PPI */
  83         if (intspec[0])
  84                 return -EINVAL;
  85
  86         *out_hwirq = intspec[1];
  87         *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
  88         return 0;
  89 }
  90
  91 static int mtk_sysirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
  92                                    unsigned int nr_irqs, void *arg)
  93 {
  94         int i;
  95         irq_hw_number_t hwirq;
  96         struct of_phandle_args *irq_data = arg;
  97         struct of_phandle_args gic_data = *irq_data;
  98
  99         if (irq_data->args_count != 3)
 100                 return -EINVAL;
 101
 102         /* sysirq doesn't support PPI */
 103         if (irq_data->args[0])
 104                 return -EINVAL;
 105
 106         hwirq = irq_data->args[1];
 107         for (i = 0; i < nr_irqs; i++)
 108                 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
 109                                               &mtk_sysirq_chip,
 110                                               domain->host_data);
 111
 112         gic_data.np = domain->parent->of_node;
 113         return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_data);
 114 }
 115
 116 static struct irq_domain_ops sysirq_domain_ops = {
 117         .xlate = mtk_sysirq_domain_xlate,
 118         .alloc = mtk_sysirq_domain_alloc,
 119         .free = irq_domain_free_irqs_common,
 120 };
 121
 122 static int __init mtk_sysirq_of_init(struct device_node *node,
 123                                      struct device_node *parent)
 124 {
 125         struct irq_domain *domain, *domain_parent;
 126         struct mtk_sysirq_chip_data *chip_data;
 127         int ret = 0;
 128
 129         domain_parent = irq_find_host(parent);
 130         if (!domain_parent) {
 131                 pr_err("mtk_sysirq: interrupt-parent not found\n");
 132                 return -EINVAL;
 133         }
 134
 135         chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
 136         if (!chip_data)
 137                 return -ENOMEM;
 138
 139         chip_data->intpol_base = of_io_request_and_map(node, 0, "intpol");
 140         if (!chip_data->intpol_base) {
 141                 pr_err("mtk_sysirq: unable to map sysirq register\n");
 142                 ret = -ENOMEM;
 143                 goto out_free;
 144         }
 145
 146         domain = irq_domain_add_hierarchy(domain_parent, 0,
 147                                           MT6577_SYS_INTPOL_NUM, node,
 148                                           &sysirq_domain_ops, chip_data);
 149         if (!domain) {
 150                 ret = -ENOMEM;
 151                 goto out_unmap;
 152         }
 153         spin_lock_init(&chip_data->lock);
 154
 155         return 0;
 156
 157 out_unmap:
 158         iounmap(chip_data->intpol_base);
 159 out_free:
 160         kfree(chip_data);
 161         return ret;
 162 }
 163 IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init);