drivers/irqchip/irq-renesas-rza1.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Renesas RZ/A1 IRQC Driver
   4  *
   5  * Copyright (C) 2019 Glider bvba
   6  */
   7
   8 #include <linux/err.h>
   9 #include <linux/init.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/io.h>
  12 #include <linux/irqdomain.h>
  13 #include <linux/irq.h>
  14 #include <linux/module.h>
  15 #include <linux/of_irq.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18
  19 #include <dt-bindings/interrupt-controller/arm-gic.h>
  20
  21 #define IRQC_NUM_IRQ            8
  22
  23 #define ICR0                    0       /* Interrupt Control Register 0 */
  24
  25 #define ICR0_NMIL               BIT(15) /* NMI Input Level (0=low, 1=high) */
  26 #define ICR0_NMIE               BIT(8)  /* Edge Select (0=falling, 1=rising) */
  27 #define ICR0_NMIF               BIT(1)  /* NMI Interrupt Request */
  28
  29 #define ICR1                    2       /* Interrupt Control Register 1 */
  30
  31 #define ICR1_IRQS(n, sense)     ((sense) << ((n) * 2))  /* IRQ Sense Select */
  32 #define ICR1_IRQS_LEVEL_LOW     0
  33 #define ICR1_IRQS_EDGE_FALLING  1
  34 #define ICR1_IRQS_EDGE_RISING   2
  35 #define ICR1_IRQS_EDGE_BOTH     3
  36 #define ICR1_IRQS_MASK(n)       ICR1_IRQS((n), 3)
  37
  38 #define IRQRR                   4       /* IRQ Interrupt Request Register */
  39
  40
  41 struct rza1_irqc_priv {
  42         struct device *dev;
  43         void __iomem *base;
  44         struct irq_chip chip;
  45         struct irq_domain *irq_domain;
  46         struct of_phandle_args map[IRQC_NUM_IRQ];
  47 };
  48
  49 static struct rza1_irqc_priv *irq_data_to_priv(struct irq_data *data)
  50 {
  51         return data->domain->host_data;
  52 }
  53
  54 static void rza1_irqc_eoi(struct irq_data *d)
  55 {
  56         struct rza1_irqc_priv *priv = irq_data_to_priv(d);
  57         u16 bit = BIT(irqd_to_hwirq(d));
  58         u16 tmp;
  59
  60         tmp = readw_relaxed(priv->base + IRQRR);
  61         if (tmp & bit)
  62                 writew_relaxed(GENMASK(IRQC_NUM_IRQ - 1, 0) & ~bit,
  63                                priv->base + IRQRR);
  64
  65         irq_chip_eoi_parent(d);
  66 }
  67
  68 static int rza1_irqc_set_type(struct irq_data *d, unsigned int type)
  69 {
  70         struct rza1_irqc_priv *priv = irq_data_to_priv(d);
  71         unsigned int hw_irq = irqd_to_hwirq(d);
  72         u16 sense, tmp;
  73
  74         switch (type & IRQ_TYPE_SENSE_MASK) {
  75         case IRQ_TYPE_LEVEL_LOW:
  76                 sense = ICR1_IRQS_LEVEL_LOW;
  77                 break;
  78
  79         case IRQ_TYPE_EDGE_FALLING:
  80                 sense = ICR1_IRQS_EDGE_FALLING;
  81                 break;
  82
  83         case IRQ_TYPE_EDGE_RISING:
  84                 sense = ICR1_IRQS_EDGE_RISING;
  85                 break;
  86
  87         case IRQ_TYPE_EDGE_BOTH:
  88                 sense = ICR1_IRQS_EDGE_BOTH;
  89                 break;
  90
  91         default:
  92                 return -EINVAL;
  93         }
  94
  95         tmp = readw_relaxed(priv->base + ICR1);
  96         tmp &= ~ICR1_IRQS_MASK(hw_irq);
  97         tmp |= ICR1_IRQS(hw_irq, sense);
  98         writew_relaxed(tmp, priv->base + ICR1);
  99         return 0;
 100 }
 101
 102 static int rza1_irqc_alloc(struct irq_domain *domain, unsigned int virq,
 103                            unsigned int nr_irqs, void *arg)
 104 {
 105         struct rza1_irqc_priv *priv = domain->host_data;
 106         struct irq_fwspec *fwspec = arg;
 107         unsigned int hwirq = fwspec->param[0];
 108         struct irq_fwspec spec;
 109         unsigned int i;
 110         int ret;
 111
 112         ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &priv->chip,
 113                                             priv);
 114         if (ret)
 115                 return ret;
 116
 117         spec.fwnode = &priv->dev->of_node->fwnode;
 118         spec.param_count = priv->map[hwirq].args_count;
 119         for (i = 0; i < spec.param_count; i++)
 120                 spec.param[i] = priv->map[hwirq].args[i];
 121
 122         return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &spec);
 123 }
 124
 125 static int rza1_irqc_translate(struct irq_domain *domain,
 126                                struct irq_fwspec *fwspec, unsigned long *hwirq,
 127                                unsigned int *type)
 128 {
 129         if (fwspec->param_count != 2 || fwspec->param[0] >= IRQC_NUM_IRQ)
 130                 return -EINVAL;
 131
 132         *hwirq = fwspec->param[0];
 133         *type = fwspec->param[1];
 134         return 0;
 135 }
 136
 137 static const struct irq_domain_ops rza1_irqc_domain_ops = {
 138         .alloc = rza1_irqc_alloc,
 139         .translate = rza1_irqc_translate,
 140 };
 141
 142 static int rza1_irqc_parse_map(struct rza1_irqc_priv *priv,
 143                                struct device_node *gic_node)
 144 {
 145         unsigned int imaplen, i, j, ret;
 146         struct device *dev = priv->dev;
 147         struct device_node *ipar;
 148         const __be32 *imap;
 149         u32 intsize;
 150
 151         imap = of_get_property(dev->of_node, "interrupt-map", &imaplen);
 152         if (!imap)
 153                 return -EINVAL;
 154
 155         for (i = 0; i < IRQC_NUM_IRQ; i++) {
 156                 if (imaplen < 3)
 157                         return -EINVAL;
 158
 159                 /* Check interrupt number, ignore sense */
 160                 if (be32_to_cpup(imap) != i)
 161                         return -EINVAL;
 162
 163                 ipar = of_find_node_by_phandle(be32_to_cpup(imap + 2));
 164                 if (ipar != gic_node) {
 165                         of_node_put(ipar);
 166                         return -EINVAL;
 167                 }
 168
 169                 imap += 3;
 170                 imaplen -= 3;
 171
 172                 ret = of_property_read_u32(ipar, "#interrupt-cells", &intsize);
 173                 of_node_put(ipar);
 174                 if (ret)
 175                         return ret;
 176
 177                 if (imaplen < intsize)
 178                         return -EINVAL;
 179
 180                 priv->map[i].args_count = intsize;
 181                 for (j = 0; j < intsize; j++)
 182                         priv->map[i].args[j] = be32_to_cpup(imap++);
 183
 184                 imaplen -= intsize;
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int rza1_irqc_probe(struct platform_device *pdev)
 191 {
 192         struct device *dev = &pdev->dev;
 193         struct device_node *np = dev->of_node;
 194         struct irq_domain *parent = NULL;
 195         struct device_node *gic_node;
 196         struct rza1_irqc_priv *priv;
 197         int ret;
 198
 199         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 200         if (!priv)
 201                 return -ENOMEM;
 202
 203         platform_set_drvdata(pdev, priv);
 204         priv->dev = dev;
 205
 206         priv->base = devm_platform_ioremap_resource(pdev, 0);
 207         if (IS_ERR(priv->base))
 208                 return PTR_ERR(priv->base);
 209
 210         gic_node = of_irq_find_parent(np);
 211         if (gic_node)
 212                 parent = irq_find_host(gic_node);
 213
 214         if (!parent) {
 215                 dev_err(dev, "cannot find parent domain\n");
 216                 ret = -ENODEV;
 217                 goto out_put_node;
 218         }
 219
 220         ret = rza1_irqc_parse_map(priv, gic_node);
 221         if (ret) {
 222                 dev_err(dev, "cannot parse %s: %d\n", "interrupt-map", ret);
 223                 goto out_put_node;
 224         }
 225
 226         priv->chip.name = "rza1-irqc",
 227         priv->chip.irq_mask = irq_chip_mask_parent,
 228         priv->chip.irq_unmask = irq_chip_unmask_parent,
 229         priv->chip.irq_eoi = rza1_irqc_eoi,
 230         priv->chip.irq_retrigger = irq_chip_retrigger_hierarchy,
 231         priv->chip.irq_set_type = rza1_irqc_set_type,
 232         priv->chip.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE;
 233
 234         priv->irq_domain = irq_domain_add_hierarchy(parent, 0, IRQC_NUM_IRQ,
 235                                                     np, &rza1_irqc_domain_ops,
 236                                                     priv);
 237         if (!priv->irq_domain) {
 238                 dev_err(dev, "cannot initialize irq domain\n");
 239                 ret = -ENOMEM;
 240         }
 241
 242 out_put_node:
 243         of_node_put(gic_node);
 244         return ret;
 245 }
 246
 247 static int rza1_irqc_remove(struct platform_device *pdev)
 248 {
 249         struct rza1_irqc_priv *priv = platform_get_drvdata(pdev);
 250
 251         irq_domain_remove(priv->irq_domain);
 252         return 0;
 253 }
 254
 255 static const struct of_device_id rza1_irqc_dt_ids[] = {
 256         { .compatible = "renesas,rza1-irqc" },
 257         {},
 258 };
 259 MODULE_DEVICE_TABLE(of, rza1_irqc_dt_ids);
 260
 261 static struct platform_driver rza1_irqc_device_driver = {
 262         .probe          = rza1_irqc_probe,
 263         .remove         = rza1_irqc_remove,
 264         .driver         = {
 265                 .name   = "renesas_rza1_irqc",
 266                 .of_match_table = rza1_irqc_dt_ids,
 267         }
 268 };
 269
 270 static int __init rza1_irqc_init(void)
 271 {
 272         return platform_driver_register(&rza1_irqc_device_driver);
 273 }
 274 postcore_initcall(rza1_irqc_init);
 275
 276 static void __exit rza1_irqc_exit(void)
 277 {
 278         platform_driver_unregister(&rza1_irqc_device_driver);
 279 }
 280 module_exit(rza1_irqc_exit);
 281
 282 MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
 283 MODULE_DESCRIPTION("Renesas RZ/A1 IRQC Driver");
 284 MODULE_LICENSE("GPL v2");