linux/drivers/irqchip/irq-ls-extirq.c
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   1// SPDX-License-Identifier: GPL-2.0
   2
   3#define pr_fmt(fmt) "irq-ls-extirq: " fmt
   4
   5#include <linux/irq.h>
   6#include <linux/irqchip.h>
   7#include <linux/irqdomain.h>
   8#include <linux/of.h>
   9#include <linux/mfd/syscon.h>
  10#include <linux/regmap.h>
  11#include <linux/slab.h>
  12
  13#include <dt-bindings/interrupt-controller/arm-gic.h>
  14
  15#define MAXIRQ 12
  16#define LS1021A_SCFGREVCR 0x200
  17
  18struct ls_extirq_data {
  19        struct regmap           *syscon;
  20        u32                     intpcr;
  21        bool                    is_ls1021a_or_ls1043a;
  22        u32                     nirq;
  23        struct irq_fwspec       map[MAXIRQ];
  24};
  25
  26static int
  27ls_extirq_set_type(struct irq_data *data, unsigned int type)
  28{
  29        struct ls_extirq_data *priv = data->chip_data;
  30        irq_hw_number_t hwirq = data->hwirq;
  31        u32 value, mask;
  32
  33        if (priv->is_ls1021a_or_ls1043a)
  34                mask = 1U << (31 - hwirq);
  35        else
  36                mask = 1U << hwirq;
  37
  38        switch (type) {
  39        case IRQ_TYPE_LEVEL_LOW:
  40                type = IRQ_TYPE_LEVEL_HIGH;
  41                value = mask;
  42                break;
  43        case IRQ_TYPE_EDGE_FALLING:
  44                type = IRQ_TYPE_EDGE_RISING;
  45                value = mask;
  46                break;
  47        case IRQ_TYPE_LEVEL_HIGH:
  48        case IRQ_TYPE_EDGE_RISING:
  49                value = 0;
  50                break;
  51        default:
  52                return -EINVAL;
  53        }
  54        regmap_update_bits(priv->syscon, priv->intpcr, mask, value);
  55
  56        return irq_chip_set_type_parent(data, type);
  57}
  58
  59static struct irq_chip ls_extirq_chip = {
  60        .name                   = "ls-extirq",
  61        .irq_mask               = irq_chip_mask_parent,
  62        .irq_unmask             = irq_chip_unmask_parent,
  63        .irq_eoi                = irq_chip_eoi_parent,
  64        .irq_set_type           = ls_extirq_set_type,
  65        .irq_retrigger          = irq_chip_retrigger_hierarchy,
  66        .irq_set_affinity       = irq_chip_set_affinity_parent,
  67        .flags                  = IRQCHIP_SET_TYPE_MASKED,
  68};
  69
  70static int
  71ls_extirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
  72                       unsigned int nr_irqs, void *arg)
  73{
  74        struct ls_extirq_data *priv = domain->host_data;
  75        struct irq_fwspec *fwspec = arg;
  76        irq_hw_number_t hwirq;
  77
  78        if (fwspec->param_count != 2)
  79                return -EINVAL;
  80
  81        hwirq = fwspec->param[0];
  82        if (hwirq >= priv->nirq)
  83                return -EINVAL;
  84
  85        irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &ls_extirq_chip,
  86                                      priv);
  87
  88        return irq_domain_alloc_irqs_parent(domain, virq, 1, &priv->map[hwirq]);
  89}
  90
  91static const struct irq_domain_ops extirq_domain_ops = {
  92        .xlate          = irq_domain_xlate_twocell,
  93        .alloc          = ls_extirq_domain_alloc,
  94        .free           = irq_domain_free_irqs_common,
  95};
  96
  97static int
  98ls_extirq_parse_map(struct ls_extirq_data *priv, struct device_node *node)
  99{
 100        const __be32 *map;
 101        u32 mapsize;
 102        int ret;
 103
 104        map = of_get_property(node, "interrupt-map", &mapsize);
 105        if (!map)
 106                return -ENOENT;
 107        if (mapsize % sizeof(*map))
 108                return -EINVAL;
 109        mapsize /= sizeof(*map);
 110
 111        while (mapsize) {
 112                struct device_node *ipar;
 113                u32 hwirq, intsize, j;
 114
 115                if (mapsize < 3)
 116                        return -EINVAL;
 117                hwirq = be32_to_cpup(map);
 118                if (hwirq >= MAXIRQ)
 119                        return -EINVAL;
 120                priv->nirq = max(priv->nirq, hwirq + 1);
 121
 122                ipar = of_find_node_by_phandle(be32_to_cpup(map + 2));
 123                map += 3;
 124                mapsize -= 3;
 125                if (!ipar)
 126                        return -EINVAL;
 127                priv->map[hwirq].fwnode = &ipar->fwnode;
 128                ret = of_property_read_u32(ipar, "#interrupt-cells", &intsize);
 129                if (ret)
 130                        return ret;
 131
 132                if (intsize > mapsize)
 133                        return -EINVAL;
 134
 135                priv->map[hwirq].param_count = intsize;
 136                for (j = 0; j < intsize; ++j)
 137                        priv->map[hwirq].param[j] = be32_to_cpup(map++);
 138                mapsize -= intsize;
 139        }
 140        return 0;
 141}
 142
 143static int __init
 144ls_extirq_of_init(struct device_node *node, struct device_node *parent)
 145{
 146
 147        struct irq_domain *domain, *parent_domain;
 148        struct ls_extirq_data *priv;
 149        int ret;
 150
 151        parent_domain = irq_find_host(parent);
 152        if (!parent_domain) {
 153                pr_err("Cannot find parent domain\n");
 154                return -ENODEV;
 155        }
 156
 157        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 158        if (!priv)
 159                return -ENOMEM;
 160
 161        priv->syscon = syscon_node_to_regmap(node->parent);
 162        if (IS_ERR(priv->syscon)) {
 163                ret = PTR_ERR(priv->syscon);
 164                pr_err("Failed to lookup parent regmap\n");
 165                goto out;
 166        }
 167        ret = of_property_read_u32(node, "reg", &priv->intpcr);
 168        if (ret) {
 169                pr_err("Missing INTPCR offset value\n");
 170                goto out;
 171        }
 172
 173        ret = ls_extirq_parse_map(priv, node);
 174        if (ret)
 175                goto out;
 176
 177        priv->is_ls1021a_or_ls1043a = of_device_is_compatible(node, "fsl,ls1021a-extirq") ||
 178                                      of_device_is_compatible(node, "fsl,ls1043a-extirq");
 179
 180        domain = irq_domain_add_hierarchy(parent_domain, 0, priv->nirq, node,
 181                                          &extirq_domain_ops, priv);
 182        if (!domain)
 183                ret = -ENOMEM;
 184
 185out:
 186        if (ret)
 187                kfree(priv);
 188        return ret;
 189}
 190
 191IRQCHIP_DECLARE(ls1021a_extirq, "fsl,ls1021a-extirq", ls_extirq_of_init);
 192IRQCHIP_DECLARE(ls1043a_extirq, "fsl,ls1043a-extirq", ls_extirq_of_init);
 193IRQCHIP_DECLARE(ls1088a_extirq, "fsl,ls1088a-extirq", ls_extirq_of_init);
 194