linux/drivers/irqchip/irq-mtk-sysirq.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2014 MediaTek Inc.
   4 * Author: Joe.C <yingjoe.chen@mediatek.com>
   5 */
   6
   7#include <linux/irq.h>
   8#include <linux/irqchip.h>
   9#include <linux/irqdomain.h>
  10#include <linux/of.h>
  11#include <linux/of_irq.h>
  12#include <linux/of_address.h>
  13#include <linux/io.h>
  14#include <linux/slab.h>
  15#include <linux/spinlock.h>
  16
  17struct mtk_sysirq_chip_data {
  18        raw_spinlock_t lock;
  19        u32 nr_intpol_bases;
  20        void __iomem **intpol_bases;
  21        u32 *intpol_words;
  22        u8 *intpol_idx;
  23        u16 *which_word;
  24};
  25
  26static int mtk_sysirq_set_type(struct irq_data *data, unsigned int type)
  27{
  28        irq_hw_number_t hwirq = data->hwirq;
  29        struct mtk_sysirq_chip_data *chip_data = data->chip_data;
  30        u8 intpol_idx = chip_data->intpol_idx[hwirq];
  31        void __iomem *base;
  32        u32 offset, reg_index, value;
  33        unsigned long flags;
  34        int ret;
  35
  36        base = chip_data->intpol_bases[intpol_idx];
  37        reg_index = chip_data->which_word[hwirq];
  38        offset = hwirq & 0x1f;
  39
  40        raw_spin_lock_irqsave(&chip_data->lock, flags);
  41        value = readl_relaxed(base + reg_index * 4);
  42        if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
  43                if (type == IRQ_TYPE_LEVEL_LOW)
  44                        type = IRQ_TYPE_LEVEL_HIGH;
  45                else
  46                        type = IRQ_TYPE_EDGE_RISING;
  47                value |= (1 << offset);
  48        } else {
  49                value &= ~(1 << offset);
  50        }
  51
  52        writel_relaxed(value, base + reg_index * 4);
  53
  54        data = data->parent_data;
  55        ret = data->chip->irq_set_type(data, type);
  56        raw_spin_unlock_irqrestore(&chip_data->lock, flags);
  57        return ret;
  58}
  59
  60static struct irq_chip mtk_sysirq_chip = {
  61        .name                   = "MT_SYSIRQ",
  62        .irq_mask               = irq_chip_mask_parent,
  63        .irq_unmask             = irq_chip_unmask_parent,
  64        .irq_eoi                = irq_chip_eoi_parent,
  65        .irq_set_type           = mtk_sysirq_set_type,
  66        .irq_retrigger          = irq_chip_retrigger_hierarchy,
  67        .irq_set_affinity       = irq_chip_set_affinity_parent,
  68};
  69
  70static int mtk_sysirq_domain_translate(struct irq_domain *d,
  71                                       struct irq_fwspec *fwspec,
  72                                       unsigned long *hwirq,
  73                                       unsigned int *type)
  74{
  75        if (is_of_node(fwspec->fwnode)) {
  76                if (fwspec->param_count != 3)
  77                        return -EINVAL;
  78
  79                /* No PPI should point to this domain */
  80                if (fwspec->param[0] != 0)
  81                        return -EINVAL;
  82
  83                *hwirq = fwspec->param[1];
  84                *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
  85                return 0;
  86        }
  87
  88        return -EINVAL;
  89}
  90
  91static 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 irq_fwspec *fwspec = arg;
  97        struct irq_fwspec gic_fwspec = *fwspec;
  98
  99        if (fwspec->param_count != 3)
 100                return -EINVAL;
 101
 102        /* sysirq doesn't support PPI */
 103        if (fwspec->param[0])
 104                return -EINVAL;
 105
 106        hwirq = fwspec->param[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_fwspec.fwnode = domain->parent->fwnode;
 113        return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_fwspec);
 114}
 115
 116static const struct irq_domain_ops sysirq_domain_ops = {
 117        .translate      = mtk_sysirq_domain_translate,
 118        .alloc          = mtk_sysirq_domain_alloc,
 119        .free           = irq_domain_free_irqs_common,
 120};
 121
 122static 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, size, intpol_num = 0, nr_intpol_bases = 0, i = 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        while (of_get_address(node, i++, NULL, NULL))
 140                nr_intpol_bases++;
 141
 142        if (nr_intpol_bases == 0) {
 143                pr_err("mtk_sysirq: base address not specified\n");
 144                ret = -EINVAL;
 145                goto out_free_chip;
 146        }
 147
 148        chip_data->intpol_words = kcalloc(nr_intpol_bases,
 149                                          sizeof(*chip_data->intpol_words),
 150                                          GFP_KERNEL);
 151        if (!chip_data->intpol_words) {
 152                ret = -ENOMEM;
 153                goto out_free_chip;
 154        }
 155
 156        chip_data->intpol_bases = kcalloc(nr_intpol_bases,
 157                                          sizeof(*chip_data->intpol_bases),
 158                                          GFP_KERNEL);
 159        if (!chip_data->intpol_bases) {
 160                ret = -ENOMEM;
 161                goto out_free_intpol_words;
 162        }
 163
 164        for (i = 0; i < nr_intpol_bases; i++) {
 165                struct resource res;
 166
 167                ret = of_address_to_resource(node, i, &res);
 168                size = resource_size(&res);
 169                intpol_num += size * 8;
 170                chip_data->intpol_words[i] = size / 4;
 171                chip_data->intpol_bases[i] = of_iomap(node, i);
 172                if (ret || !chip_data->intpol_bases[i]) {
 173                        pr_err("%pOF: couldn't map region %d\n", node, i);
 174                        ret = -ENODEV;
 175                        goto out_free_intpol;
 176                }
 177        }
 178
 179        chip_data->intpol_idx = kcalloc(intpol_num,
 180                                        sizeof(*chip_data->intpol_idx),
 181                                        GFP_KERNEL);
 182        if (!chip_data->intpol_idx) {
 183                ret = -ENOMEM;
 184                goto out_free_intpol;
 185        }
 186
 187        chip_data->which_word = kcalloc(intpol_num,
 188                                        sizeof(*chip_data->which_word),
 189                                        GFP_KERNEL);
 190        if (!chip_data->which_word) {
 191                ret = -ENOMEM;
 192                goto out_free_intpol_idx;
 193        }
 194
 195        /*
 196         * assign an index of the intpol_bases for each irq
 197         * to set it fast later
 198         */
 199        for (i = 0; i < intpol_num ; i++) {
 200                u32 word = i / 32, j;
 201
 202                for (j = 0; word >= chip_data->intpol_words[j] ; j++)
 203                        word -= chip_data->intpol_words[j];
 204
 205                chip_data->intpol_idx[i] = j;
 206                chip_data->which_word[i] = word;
 207        }
 208
 209        domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node,
 210                                          &sysirq_domain_ops, chip_data);
 211        if (!domain) {
 212                ret = -ENOMEM;
 213                goto out_free_which_word;
 214        }
 215        raw_spin_lock_init(&chip_data->lock);
 216
 217        return 0;
 218
 219out_free_which_word:
 220        kfree(chip_data->which_word);
 221out_free_intpol_idx:
 222        kfree(chip_data->intpol_idx);
 223out_free_intpol:
 224        for (i = 0; i < nr_intpol_bases; i++)
 225                if (chip_data->intpol_bases[i])
 226                        iounmap(chip_data->intpol_bases[i]);
 227        kfree(chip_data->intpol_bases);
 228out_free_intpol_words:
 229        kfree(chip_data->intpol_words);
 230out_free_chip:
 231        kfree(chip_data);
 232        return ret;
 233}
 234IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init);
 235
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