drivers/misc/irq_sandbox.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Sandbox driver for interrupts
   4  *
   5  * Copyright 2019 Google LLC
   6  */
   7
   8 #include <dm.h>
   9 #include <irq.h>
  10 #include <acpi/acpi_device.h>
  11 #include <asm/irq.h>
  12 #include <asm/test.h>
  13
  14 static int sandbox_set_polarity(struct udevice *dev, uint irq, bool active_low)
  15 {
  16         if (irq > 10)
  17                 return -EINVAL;
  18
  19         return 0;
  20 }
  21
  22 static int sandbox_route_pmc_gpio_gpe(struct udevice *dev, uint pmc_gpe_num)
  23 {
  24         if (pmc_gpe_num > 10)
  25                 return -ENOENT;
  26
  27         return pmc_gpe_num + 1;
  28 }
  29
  30 static int sandbox_snapshot_polarities(struct udevice *dev)
  31 {
  32         return 0;
  33 }
  34
  35 static int sandbox_restore_polarities(struct udevice *dev)
  36 {
  37         return 0;
  38 }
  39
  40 static int sandbox_irq_read_and_clear(struct irq *irq)
  41 {
  42         struct sandbox_irq_priv *priv = dev_get_priv(irq->dev);
  43
  44         if (irq->id != SANDBOX_IRQN_PEND)
  45                 return -EINVAL;
  46         priv->count++;
  47         if (priv->pending) {
  48                 priv->pending = false;
  49                 return 1;
  50         }
  51
  52         if (!(priv->count % 3))
  53                 priv->pending = true;
  54
  55         return 0;
  56 }
  57
  58 static int sandbox_irq_of_xlate(struct irq *irq,
  59                                 struct ofnode_phandle_args *args)
  60 {
  61         irq->id = args->args[0];
  62
  63         return 0;
  64 }
  65
  66 static __maybe_unused int sandbox_get_acpi(const struct irq *irq,
  67                                            struct acpi_irq *acpi_irq)
  68 {
  69         acpi_irq->pin = irq->id;
  70         acpi_irq->mode = ACPI_IRQ_LEVEL_TRIGGERED;
  71         acpi_irq->polarity = ACPI_IRQ_ACTIVE_HIGH;
  72         acpi_irq->shared = ACPI_IRQ_SHARED;
  73         acpi_irq->wake = ACPI_IRQ_WAKE;
  74
  75         return 0;
  76 }
  77
  78 static const struct irq_ops sandbox_irq_ops = {
  79         .route_pmc_gpio_gpe     = sandbox_route_pmc_gpio_gpe,
  80         .set_polarity           = sandbox_set_polarity,
  81         .snapshot_polarities    = sandbox_snapshot_polarities,
  82         .restore_polarities     = sandbox_restore_polarities,
  83         .read_and_clear         = sandbox_irq_read_and_clear,
  84         .of_xlate               = sandbox_irq_of_xlate,
  85 #if CONFIG_IS_ENABLED(ACPIGEN)
  86         .get_acpi               = sandbox_get_acpi,
  87 #endif
  88 };
  89
  90 static const struct udevice_id sandbox_irq_ids[] = {
  91         { .compatible = "sandbox,irq", SANDBOX_IRQT_BASE },
  92         { }
  93 };
  94
  95 U_BOOT_DRIVER(sandbox_irq) = {
  96         .name           = "sandbox_irq",
  97         .id             = UCLASS_IRQ,
  98         .of_match       = sandbox_irq_ids,
  99         .ops            = &sandbox_irq_ops,
 100         .priv_auto      = sizeof(struct sandbox_irq_priv),
 101         DM_HEADER(<asm/irq.h>)
 102 };