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_index_platdata(struct udevice *dev, int index,
  68                               struct phandle_1_arg *cells, struct irq *irq)
  69 {
  70         int ret;
  71
  72         if (index != 0)
  73                 return -ENOSYS;
  74         ret = uclass_get_device(UCLASS_IRQ, 0, &irq->dev);
  75         if (ret)
  76                 return ret;
  77         irq->id = cells[0].arg[0];
  78
  79         return 0;
  80 }
  81 #else
  82 static int irq_of_xlate_default(struct irq *irq,
  83                                 struct ofnode_phandle_args *args)
  84 {
  85         log_debug("(irq=%p)\n", irq);
  86
  87         if (args->args_count > 1) {
  88                 log_debug("Invaild args_count: %d\n", args->args_count);
  89                 return -EINVAL;
  90         }
  91
  92         if (args->args_count)
  93                 irq->id = args->args[0];
  94         else
  95                 irq->id = 0;
  96
  97         return 0;
  98 }
  99
 100 static int irq_get_by_index_tail(int ret, ofnode node,
 101                                  struct ofnode_phandle_args *args,
 102                                  const char *list_name, int index,
 103                                  struct irq *irq)
 104 {
 105         struct udevice *dev_irq;
 106         const struct irq_ops *ops;
 107
 108         assert(irq);
 109         irq->dev = NULL;
 110         if (ret)
 111                 goto err;
 112
 113         ret = uclass_get_device_by_ofnode(UCLASS_IRQ, args->node, &dev_irq);
 114         if (ret) {
 115                 log_debug("uclass_get_device_by_ofnode failed: err=%d\n", ret);
 116                 return ret;
 117         }
 118
 119         irq->dev = dev_irq;
 120
 121         ops = irq_get_ops(dev_irq);
 122
 123         if (ops->of_xlate)
 124                 ret = ops->of_xlate(irq, args);
 125         else
 126                 ret = irq_of_xlate_default(irq, args);
 127         if (ret) {
 128                 log_debug("of_xlate() failed: %d\n", ret);
 129                 return ret;
 130         }
 131
 132         return irq_request(dev_irq, irq);
 133 err:
 134         log_debug("Node '%s', property '%s', failed to request IRQ index %d: %d\n",
 135                   ofnode_get_name(node), list_name, index, ret);
 136         return ret;
 137 }
 138
 139 int irq_get_by_index(struct udevice *dev, int index, struct irq *irq)
 140 {
 141         struct ofnode_phandle_args args;
 142         int ret;
 143
 144         ret = dev_read_phandle_with_args(dev, "interrupts-extended",
 145                                          "#interrupt-cells", 0, index, &args);
 146
 147         return irq_get_by_index_tail(ret, dev_ofnode(dev), &args,
 148                                      "interrupts-extended", index > 0, irq);
 149 }
 150 #endif /* OF_PLATDATA */
 151
 152 int irq_request(struct udevice *dev, struct irq *irq)
 153 {
 154         const struct irq_ops *ops;
 155
 156         log_debug("(dev=%p, irq=%p)\n", dev, irq);
 157         if (!irq)
 158                 return 0;
 159         ops = irq_get_ops(dev);
 160
 161         irq->dev = dev;
 162
 163         if (!ops->request)
 164                 return 0;
 165
 166         return ops->request(irq);
 167 }
 168
 169 int irq_first_device_type(enum irq_dev_t type, struct udevice **devp)
 170 {
 171         int ret;
 172
 173         ret = uclass_first_device_drvdata(UCLASS_IRQ, type, devp);
 174         if (ret)
 175                 return log_msg_ret("find", ret);
 176
 177         return 0;
 178 }
 179
 180 UCLASS_DRIVER(irq) = {
 181         .id             = UCLASS_IRQ,
 182         .name           = "irq",
 183 };