drivers/misc/irq-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2019 Google, LLC
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #define LOG_CATEGORY UCLASS_IRQ
   8
   9 #include <dm.h>
  10 #include <dt-structs.h>
  11 #include <irq.h>
  12 #include <log.h>
  13 #include <dm/device-internal.h>
  14
  15 int irq_route_pmc_gpio_gpe(struct udevice *dev, uint pmc_gpe_num)
  16 {
  17         const struct irq_ops *ops = irq_get_ops(dev);
  18
  19         if (!ops->route_pmc_gpio_gpe)
  20                 return -ENOSYS;
  21
  22         return ops->route_pmc_gpio_gpe(dev, pmc_gpe_num);
  23 }
  24
  25 int irq_set_polarity(struct udevice *dev, uint irq, bool active_low)
  26 {
  27         const struct irq_ops *ops = irq_get_ops(dev);
  28
  29         if (!ops->set_polarity)
  30                 return -ENOSYS;
  31
  32         return ops->set_polarity(dev, irq, active_low);
  33 }
  34
  35 int irq_snapshot_polarities(struct udevice *dev)
  36 {
  37         const struct irq_ops *ops = irq_get_ops(dev);
  38
  39         if (!ops->snapshot_polarities)
  40                 return -ENOSYS;
  41
  42         return ops->snapshot_polarities(dev);
  43 }
  44
  45 int irq_restore_polarities(struct udevice *dev)
  46 {
  47         const struct irq_ops *ops = irq_get_ops(dev);
  48
  49         if (!ops->restore_polarities)
  50                 return -ENOSYS;
  51
  52         return ops->restore_polarities(dev);
  53 }
  54
  55 int irq_read_and_clear(struct irq *irq)
  56 {
  57         const struct irq_ops *ops = irq_get_ops(irq->dev);
  58
  59         if (!ops->read_and_clear)
  60                 return -ENOSYS;
  61
  62         return ops->read_and_clear(irq);
  63 }
  64
  65 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  66 int irq_get_by_phandle(struct udevice *dev, const struct phandle_2_arg *cells,
  67                        struct irq *irq)
  68 {
  69         int ret;
  70
  71         ret = device_get_by_ofplat_idx(cells->idx, &irq->dev);
  72         if (ret)
  73                 return ret;
  74         irq->id = cells->arg[0];
  75
  76         /*
  77          * Note: we could call irq_of_xlate_default() here to do this properly.
  78          * For now, this is good enough for existing cases.
  79          */
  80         irq->flags = cells->arg[1];
  81
  82         return 0;
  83 }
  84 #else
  85 static int irq_of_xlate_default(struct irq *irq,
  86                                 struct ofnode_phandle_args *args)
  87 {
  88         log_debug("(irq=%p)\n", irq);
  89
  90         if (args->args_count > 1) {
  91                 log_debug("Invalid args_count: %d\n", args->args_count);
  92                 return -EINVAL;
  93         }
  94
  95         if (args->args_count)
  96                 irq->id = args->args[0];
  97         else
  98                 irq->id = 0;
  99
 100         return 0;
 101 }
 102
 103 static int irq_get_by_index_tail(int ret, ofnode node,
 104                                  struct ofnode_phandle_args *args,
 105                                  const char *list_name, int index,
 106                                  struct irq *irq)
 107 {
 108         struct udevice *dev_irq;
 109         const struct irq_ops *ops;
 110
 111         assert(irq);
 112         irq->dev = NULL;
 113         if (ret)
 114                 goto err;
 115
 116         ret = uclass_get_device_by_ofnode(UCLASS_IRQ, args->node, &dev_irq);
 117         if (ret) {
 118                 log_debug("uclass_get_device_by_ofnode failed: err=%d\n", ret);
 119                 return ret;
 120         }
 121
 122         irq->dev = dev_irq;
 123
 124         ops = irq_get_ops(dev_irq);
 125
 126         if (ops->of_xlate)
 127                 ret = ops->of_xlate(irq, args);
 128         else
 129                 ret = irq_of_xlate_default(irq, args);
 130         if (ret) {
 131                 log_debug("of_xlate() failed: %d\n", ret);
 132                 return ret;
 133         }
 134
 135         return irq_request(dev_irq, irq);
 136 err:
 137         log_debug("Node '%s', property '%s', failed to request IRQ index %d: %d\n",
 138                   ofnode_get_name(node), list_name, index, ret);
 139         return ret;
 140 }
 141
 142 int irq_get_by_index(struct udevice *dev, int index, struct irq *irq)
 143 {
 144         struct ofnode_phandle_args args;
 145         int ret;
 146
 147         ret = dev_read_phandle_with_args(dev, "interrupts-extended",
 148                                          "#interrupt-cells", 0, index, &args);
 149
 150         return irq_get_by_index_tail(ret, dev_ofnode(dev), &args,
 151                                      "interrupts-extended", index > 0, irq);
 152 }
 153 #endif /* OF_PLATDATA */
 154
 155 int irq_request(struct udevice *dev, struct irq *irq)
 156 {
 157         const struct irq_ops *ops;
 158
 159         log_debug("(dev=%p, irq=%p)\n", dev, irq);
 160         ops = irq_get_ops(dev);
 161
 162         irq->dev = dev;
 163
 164         if (!ops->request)
 165                 return 0;
 166
 167         return ops->request(irq);
 168 }
 169
 170 int irq_first_device_type(enum irq_dev_t type, struct udevice **devp)
 171 {
 172         int ret;
 173
 174         ret = uclass_first_device_drvdata(UCLASS_IRQ, type, devp);
 175         if (ret)
 176                 return ret;
 177
 178         return 0;
 179 }
 180
 181 #if CONFIG_IS_ENABLED(ACPIGEN)
 182 int irq_get_acpi(const struct irq *irq, struct acpi_irq *acpi_irq)
 183 {
 184         struct irq_ops *ops;
 185
 186         if (!irq_is_valid(irq))
 187                 return -EINVAL;
 188
 189         ops = irq_get_ops(irq->dev);
 190         if (!ops->get_acpi)
 191                 return -ENOSYS;
 192
 193         return ops->get_acpi(irq, acpi_irq);
 194 }
 195 #endif
 196
 197 UCLASS_DRIVER(irq) = {
 198         .id             = UCLASS_IRQ,
 199         .name           = "irq",
 200 };