drivers/irqchip/irq-mtk-sysirq.c

   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
  17 struct 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
  26 static 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
  60 static 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         .flags                  = IRQCHIP_SKIP_SET_WAKE,
  69 };
  70
  71 static int mtk_sysirq_domain_translate(struct irq_domain *d,
  72                                        struct irq_fwspec *fwspec,
  73                                        unsigned long *hwirq,
  74                                        unsigned int *type)
  75 {
  76         if (is_of_node(fwspec->fwnode)) {
  77                 if (fwspec->param_count != 3)
  78                         return -EINVAL;
  79
  80                 /* No PPI should point to this domain */
  81                 if (fwspec->param[0] != 0)
  82                         return -EINVAL;
  83
  84                 *hwirq = fwspec->param[1];
  85                 *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
  86                 return 0;
  87         }
  88
  89         return -EINVAL;
  90 }
  91
  92 static int mtk_sysirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
  93                                    unsigned int nr_irqs, void *arg)
  94 {
  95         int i;
  96         irq_hw_number_t hwirq;
  97         struct irq_fwspec *fwspec = arg;
  98         struct irq_fwspec gic_fwspec = *fwspec;
  99
 100         if (fwspec->param_count != 3)
 101                 return -EINVAL;
 102
 103         /* sysirq doesn't support PPI */
 104         if (fwspec->param[0])
 105                 return -EINVAL;
 106
 107         hwirq = fwspec->param[1];
 108         for (i = 0; i < nr_irqs; i++)
 109                 irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
 110                                               &mtk_sysirq_chip,
 111                                               domain->host_data);
 112
 113         gic_fwspec.fwnode = domain->parent->fwnode;
 114         return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_fwspec);
 115 }
 116
 117 static const struct irq_domain_ops sysirq_domain_ops = {
 118         .translate      = mtk_sysirq_domain_translate,
 119         .alloc          = mtk_sysirq_domain_alloc,
 120         .free           = irq_domain_free_irqs_common,
 121 };
 122
 123 static int __init mtk_sysirq_of_init(struct device_node *node,
 124                                      struct device_node *parent)
 125 {
 126         struct irq_domain *domain, *domain_parent;
 127         struct mtk_sysirq_chip_data *chip_data;
 128         int ret, size, intpol_num = 0, nr_intpol_bases = 0, i = 0;
 129
 130         domain_parent = irq_find_host(parent);
 131         if (!domain_parent) {
 132                 pr_err("mtk_sysirq: interrupt-parent not found\n");
 133                 return -EINVAL;
 134         }
 135
 136         chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
 137         if (!chip_data)
 138                 return -ENOMEM;
 139
 140         while (of_get_address(node, i++, NULL, NULL))
 141                 nr_intpol_bases++;
 142
 143         if (nr_intpol_bases == 0) {
 144                 pr_err("mtk_sysirq: base address not specified\n");
 145                 ret = -EINVAL;
 146                 goto out_free_chip;
 147         }
 148
 149         chip_data->intpol_words = kcalloc(nr_intpol_bases,
 150                                           sizeof(*chip_data->intpol_words),
 151                                           GFP_KERNEL);
 152         if (!chip_data->intpol_words) {
 153                 ret = -ENOMEM;
 154                 goto out_free_chip;
 155         }
 156
 157         chip_data->intpol_bases = kcalloc(nr_intpol_bases,
 158                                           sizeof(*chip_data->intpol_bases),
 159                                           GFP_KERNEL);
 160         if (!chip_data->intpol_bases) {
 161                 ret = -ENOMEM;
 162                 goto out_free_intpol_words;
 163         }
 164
 165         for (i = 0; i < nr_intpol_bases; i++) {
 166                 struct resource res;
 167
 168                 ret = of_address_to_resource(node, i, &res);
 169                 size = resource_size(&res);
 170                 intpol_num += size * 8;
 171                 chip_data->intpol_words[i] = size / 4;
 172                 chip_data->intpol_bases[i] = of_iomap(node, i);
 173                 if (ret || !chip_data->intpol_bases[i]) {
 174                         pr_err("%pOF: couldn't map region %d\n", node, i);
 175                         ret = -ENODEV;
 176                         goto out_free_intpol;
 177                 }
 178         }
 179
 180         chip_data->intpol_idx = kcalloc(intpol_num,
 181                                         sizeof(*chip_data->intpol_idx),
 182                                         GFP_KERNEL);
 183         if (!chip_data->intpol_idx) {
 184                 ret = -ENOMEM;
 185                 goto out_free_intpol;
 186         }
 187
 188         chip_data->which_word = kcalloc(intpol_num,
 189                                         sizeof(*chip_data->which_word),
 190                                         GFP_KERNEL);
 191         if (!chip_data->which_word) {
 192                 ret = -ENOMEM;
 193                 goto out_free_intpol_idx;
 194         }
 195
 196         /*
 197          * assign an index of the intpol_bases for each irq
 198          * to set it fast later
 199          */
 200         for (i = 0; i < intpol_num ; i++) {
 201                 u32 word = i / 32, j;
 202
 203                 for (j = 0; word >= chip_data->intpol_words[j] ; j++)
 204                         word -= chip_data->intpol_words[j];
 205
 206                 chip_data->intpol_idx[i] = j;
 207                 chip_data->which_word[i] = word;
 208         }
 209
 210         domain = irq_domain_add_hierarchy(domain_parent, 0, intpol_num, node,
 211                                           &sysirq_domain_ops, chip_data);
 212         if (!domain) {
 213                 ret = -ENOMEM;
 214                 goto out_free_which_word;
 215         }
 216         raw_spin_lock_init(&chip_data->lock);
 217
 218         return 0;
 219
 220 out_free_which_word:
 221         kfree(chip_data->which_word);
 222 out_free_intpol_idx:
 223         kfree(chip_data->intpol_idx);
 224 out_free_intpol:
 225         for (i = 0; i < nr_intpol_bases; i++)
 226                 if (chip_data->intpol_bases[i])
 227                         iounmap(chip_data->intpol_bases[i]);
 228         kfree(chip_data->intpol_bases);
 229 out_free_intpol_words:
 230         kfree(chip_data->intpol_words);
 231 out_free_chip:
 232         kfree(chip_data);
 233         return ret;
 234 }
 235 IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init);