0001
0002
0003 #define pr_fmt(fmt) "irq-ls-extirq: " fmt
0004
0005 #include <linux/irq.h>
0006 #include <linux/irqchip.h>
0007 #include <linux/irqdomain.h>
0008 #include <linux/of.h>
0009 #include <linux/mfd/syscon.h>
0010 #include <linux/regmap.h>
0011 #include <linux/slab.h>
0012
0013 #include <dt-bindings/interrupt-controller/arm-gic.h>
0014
0015 #define MAXIRQ 12
0016 #define LS1021A_SCFGREVCR 0x200
0017
0018 struct ls_extirq_data {
0019 struct regmap *syscon;
0020 u32 intpcr;
0021 bool is_ls1021a_or_ls1043a;
0022 u32 nirq;
0023 struct irq_fwspec map[MAXIRQ];
0024 };
0025
0026 static int
0027 ls_extirq_set_type(struct irq_data *data, unsigned int type)
0028 {
0029 struct ls_extirq_data *priv = data->chip_data;
0030 irq_hw_number_t hwirq = data->hwirq;
0031 u32 value, mask;
0032
0033 if (priv->is_ls1021a_or_ls1043a)
0034 mask = 1U << (31 - hwirq);
0035 else
0036 mask = 1U << hwirq;
0037
0038 switch (type) {
0039 case IRQ_TYPE_LEVEL_LOW:
0040 type = IRQ_TYPE_LEVEL_HIGH;
0041 value = mask;
0042 break;
0043 case IRQ_TYPE_EDGE_FALLING:
0044 type = IRQ_TYPE_EDGE_RISING;
0045 value = mask;
0046 break;
0047 case IRQ_TYPE_LEVEL_HIGH:
0048 case IRQ_TYPE_EDGE_RISING:
0049 value = 0;
0050 break;
0051 default:
0052 return -EINVAL;
0053 }
0054 regmap_update_bits(priv->syscon, priv->intpcr, mask, value);
0055
0056 return irq_chip_set_type_parent(data, type);
0057 }
0058
0059 static struct irq_chip ls_extirq_chip = {
0060 .name = "ls-extirq",
0061 .irq_mask = irq_chip_mask_parent,
0062 .irq_unmask = irq_chip_unmask_parent,
0063 .irq_eoi = irq_chip_eoi_parent,
0064 .irq_set_type = ls_extirq_set_type,
0065 .irq_retrigger = irq_chip_retrigger_hierarchy,
0066 .irq_set_affinity = irq_chip_set_affinity_parent,
0067 .flags = IRQCHIP_SET_TYPE_MASKED | IRQCHIP_SKIP_SET_WAKE,
0068 };
0069
0070 static int
0071 ls_extirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
0072 unsigned int nr_irqs, void *arg)
0073 {
0074 struct ls_extirq_data *priv = domain->host_data;
0075 struct irq_fwspec *fwspec = arg;
0076 irq_hw_number_t hwirq;
0077
0078 if (fwspec->param_count != 2)
0079 return -EINVAL;
0080
0081 hwirq = fwspec->param[0];
0082 if (hwirq >= priv->nirq)
0083 return -EINVAL;
0084
0085 irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &ls_extirq_chip,
0086 priv);
0087
0088 return irq_domain_alloc_irqs_parent(domain, virq, 1, &priv->map[hwirq]);
0089 }
0090
0091 static const struct irq_domain_ops extirq_domain_ops = {
0092 .xlate = irq_domain_xlate_twocell,
0093 .alloc = ls_extirq_domain_alloc,
0094 .free = irq_domain_free_irqs_common,
0095 };
0096
0097 static int
0098 ls_extirq_parse_map(struct ls_extirq_data *priv, struct device_node *node)
0099 {
0100 const __be32 *map;
0101 u32 mapsize;
0102 int ret;
0103
0104 map = of_get_property(node, "interrupt-map", &mapsize);
0105 if (!map)
0106 return -ENOENT;
0107 if (mapsize % sizeof(*map))
0108 return -EINVAL;
0109 mapsize /= sizeof(*map);
0110
0111 while (mapsize) {
0112 struct device_node *ipar;
0113 u32 hwirq, intsize, j;
0114
0115 if (mapsize < 3)
0116 return -EINVAL;
0117 hwirq = be32_to_cpup(map);
0118 if (hwirq >= MAXIRQ)
0119 return -EINVAL;
0120 priv->nirq = max(priv->nirq, hwirq + 1);
0121
0122 ipar = of_find_node_by_phandle(be32_to_cpup(map + 2));
0123 map += 3;
0124 mapsize -= 3;
0125 if (!ipar)
0126 return -EINVAL;
0127 priv->map[hwirq].fwnode = &ipar->fwnode;
0128 ret = of_property_read_u32(ipar, "#interrupt-cells", &intsize);
0129 if (ret)
0130 return ret;
0131
0132 if (intsize > mapsize)
0133 return -EINVAL;
0134
0135 priv->map[hwirq].param_count = intsize;
0136 for (j = 0; j < intsize; ++j)
0137 priv->map[hwirq].param[j] = be32_to_cpup(map++);
0138 mapsize -= intsize;
0139 }
0140 return 0;
0141 }
0142
0143 static int __init
0144 ls_extirq_of_init(struct device_node *node, struct device_node *parent)
0145 {
0146
0147 struct irq_domain *domain, *parent_domain;
0148 struct ls_extirq_data *priv;
0149 int ret;
0150
0151 parent_domain = irq_find_host(parent);
0152 if (!parent_domain) {
0153 pr_err("Cannot find parent domain\n");
0154 return -ENODEV;
0155 }
0156
0157 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0158 if (!priv)
0159 return -ENOMEM;
0160
0161 priv->syscon = syscon_node_to_regmap(node->parent);
0162 if (IS_ERR(priv->syscon)) {
0163 ret = PTR_ERR(priv->syscon);
0164 pr_err("Failed to lookup parent regmap\n");
0165 goto out;
0166 }
0167 ret = of_property_read_u32(node, "reg", &priv->intpcr);
0168 if (ret) {
0169 pr_err("Missing INTPCR offset value\n");
0170 goto out;
0171 }
0172
0173 ret = ls_extirq_parse_map(priv, node);
0174 if (ret)
0175 goto out;
0176
0177 priv->is_ls1021a_or_ls1043a = of_device_is_compatible(node, "fsl,ls1021a-extirq") ||
0178 of_device_is_compatible(node, "fsl,ls1043a-extirq");
0179
0180 domain = irq_domain_add_hierarchy(parent_domain, 0, priv->nirq, node,
0181 &extirq_domain_ops, priv);
0182 if (!domain)
0183 ret = -ENOMEM;
0184
0185 out:
0186 if (ret)
0187 kfree(priv);
0188 return ret;
0189 }
0190
0191 IRQCHIP_DECLARE(ls1021a_extirq, "fsl,ls1021a-extirq", ls_extirq_of_init);
0192 IRQCHIP_DECLARE(ls1043a_extirq, "fsl,ls1043a-extirq", ls_extirq_of_init);
0193 IRQCHIP_DECLARE(ls1088a_extirq, "fsl,ls1088a-extirq", ls_extirq_of_init);
