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 <common.h>
  10 #include <dm.h>
  11 #include <dt-structs.h>
  12 #include <irq.h>
  13 #include <log.h>
  14 #include <dm/device-internal.h>
  15
  16 int irq_route_pmc_gpio_gpe(struct udevice *dev, uint pmc_gpe_num)
  17 {
  18         const struct irq_ops *ops = irq_get_ops(dev);
  19
  20         if (!ops->route_pmc_gpio_gpe)
  21                 return -ENOSYS;
  22
  23         return ops->route_pmc_gpio_gpe(dev, pmc_gpe_num);
  24 }
  25
  26 int irq_set_polarity(struct udevice *dev, uint irq, bool active_low)
  27 {
  28         const struct irq_ops *ops = irq_get_ops(dev);
  29
  30         if (!ops->set_polarity)
  31                 return -ENOSYS;
  32
  33         return ops->set_polarity(dev, irq, active_low);
  34 }
  35
  36 int irq_snapshot_polarities(struct udevice *dev)
  37 {
  38         const struct irq_ops *ops = irq_get_ops(dev);
  39
  40         if (!ops->snapshot_polarities)
  41                 return -ENOSYS;
  42
  43         return ops->snapshot_polarities(dev);
  44 }
  45
  46 int irq_restore_polarities(struct udevice *dev)
  47 {
  48         const struct irq_ops *ops = irq_get_ops(dev);
  49
  50         if (!ops->restore_polarities)
  51                 return -ENOSYS;
  52
  53         return ops->restore_polarities(dev);
  54 }
  55
  56 int irq_read_and_clear(struct irq *irq)
  57 {
  58         const struct irq_ops *ops = irq_get_ops(irq->dev);
  59
  60         if (!ops->read_and_clear)
  61                 return -ENOSYS;
  62
  63         return ops->read_and_clear(irq);
  64 }
  65
  66 #if CONFIG_IS_ENABLED(OF_PLATDATA)
  67 int irq_get_by_phandle(struct udevice *dev, const struct phandle_2_arg *cells,
  68                        struct irq *irq)
  69 {
  70         int ret;
  71
  72         ret = device_get_by_ofplat_idx(cells->idx, &irq->dev);
  73         if (ret)
  74                 return ret;
  75         irq->id = cells->arg[0];
  76
  77         /*
  78          * Note: we could call irq_of_xlate_default() here to do this properly.
  79          * For now, this is good enough for existing cases.
  80          */
  81         irq->flags = cells->arg[1];
  82
  83         return 0;
  84 }
  85 #else
  86 static int irq_of_xlate_default(struct irq *irq,
  87                                 struct ofnode_phandle_args *args)
  88 {
  89         log_debug("(irq=%p)\n", irq);
  90
  91         if (args->args_count > 1) {
  92                 log_debug("Invalid args_count: %d\n", args->args_count);
  93                 return -EINVAL;
  94         }
  95
  96         if (args->args_count)
  97                 irq->id = args->args[0];
  98         else
  99                 irq->id = 0;
 100
 101         return 0;
 102 }
 103
 104 static int irq_get_by_index_tail(int ret, ofnode node,
 105                                  struct ofnode_phandle_args *args,
 106                                  const char *list_name, int index,
 107                                  struct irq *irq)
 108 {
 109         struct udevice *dev_irq;
 110         const struct irq_ops *ops;
 111
 112         assert(irq);
 113         irq->dev = NULL;
 114         if (ret)
 115                 goto err;
 116
 117         ret = uclass_get_device_by_ofnode(UCLASS_IRQ, args->node, &dev_irq);
 118         if (ret) {
 119                 log_debug("uclass_get_device_by_ofnode failed: err=%d\n", ret);
 120                 return ret;
 121         }
 122
 123         irq->dev = dev_irq;
 124
 125         ops = irq_get_ops(dev_irq);
 126
 127         if (ops->of_xlate)
 128                 ret = ops->of_xlate(irq, args);
 129         else
 130                 ret = irq_of_xlate_default(irq, args);
 131         if (ret) {
 132                 log_debug("of_xlate() failed: %d\n", ret);
 133                 return ret;
 134         }
 135
 136         return irq_request(dev_irq, irq);
 137 err:
 138         log_debug("Node '%s', property '%s', failed to request IRQ index %d: %d\n",
 139                   ofnode_get_name(node), list_name, index, ret);
 140         return ret;
 141 }
 142
 143 int irq_get_by_index(struct udevice *dev, int index, struct irq *irq)
 144 {
 145         struct ofnode_phandle_args args;
 146         int ret;
 147
 148         ret = dev_read_phandle_with_args(dev, "interrupts-extended",
 149                                          "#interrupt-cells", 0, index, &args);
 150
 151         return irq_get_by_index_tail(ret, dev_ofnode(dev), &args,
 152                                      "interrupts-extended", index > 0, irq);
 153 }
 154 #endif /* OF_PLATDATA */
 155
 156 int irq_request(struct udevice *dev, struct irq *irq)
 157 {
 158         const struct irq_ops *ops;
 159
 160         log_debug("(dev=%p, irq=%p)\n", dev, irq);
 161         ops = irq_get_ops(dev);
 162
 163         irq->dev = dev;
 164
 165         if (!ops->request)
 166                 return 0;
 167
 168         return ops->request(irq);
 169 }
 170
 171 int irq_first_device_type(enum irq_dev_t type, struct udevice **devp)
 172 {
 173         int ret;
 174
 175         ret = uclass_first_device_drvdata(UCLASS_IRQ, type, devp);
 176         if (ret)
 177                 return ret;
 178
 179         return 0;
 180 }
 181
 182 #if CONFIG_IS_ENABLED(ACPIGEN)
 183 int irq_get_acpi(const struct irq *irq, struct acpi_irq *acpi_irq)
 184 {
 185         struct irq_ops *ops;
 186
 187         if (!irq_is_valid(irq))
 188                 return -EINVAL;
 189
 190         ops = irq_get_ops(irq->dev);
 191         if (!ops->get_acpi)
 192                 return -ENOSYS;
 193
 194         return ops->get_acpi(irq, acpi_irq);
 195 }
 196 #endif
 197
 198 UCLASS_DRIVER(irq) = {
 199         .id             = UCLASS_IRQ,
 200         .name           = "irq",
 201 };