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 <common.h>
   9 #include <dm.h>
  10 #include <irq.h>
  11 #include <acpi/acpi_device.h>
  12 #include <asm/test.h>
  13
  14 /**
  15  * struct sandbox_irq_priv - private data for this driver
  16  *
  17  * @count: Counts the number calls to the read_and_clear() method
  18  * @pending: true if an interrupt is pending, else false
  19  */
  20 struct sandbox_irq_priv {
  21         int count;
  22         bool pending;
  23 };
  24
  25 static int sandbox_set_polarity(struct udevice *dev, uint irq, bool active_low)
  26 {
  27         if (irq > 10)
  28                 return -EINVAL;
  29
  30         return 0;
  31 }
  32
  33 static int sandbox_route_pmc_gpio_gpe(struct udevice *dev, uint pmc_gpe_num)
  34 {
  35         if (pmc_gpe_num > 10)
  36                 return -ENOENT;
  37
  38         return pmc_gpe_num + 1;
  39 }
  40
  41 static int sandbox_snapshot_polarities(struct udevice *dev)
  42 {
  43         return 0;
  44 }
  45
  46 static int sandbox_restore_polarities(struct udevice *dev)
  47 {
  48         return 0;
  49 }
  50
  51 static int sandbox_irq_read_and_clear(struct irq *irq)
  52 {
  53         struct sandbox_irq_priv *priv = dev_get_priv(irq->dev);
  54
  55         if (irq->id != SANDBOX_IRQN_PEND)
  56                 return -EINVAL;
  57         priv->count++;
  58         if (priv->pending) {
  59                 priv->pending = false;
  60                 return 1;
  61         }
  62
  63         if (!(priv->count % 3))
  64                 priv->pending = true;
  65
  66         return 0;
  67 }
  68
  69 static int sandbox_irq_of_xlate(struct irq *irq,
  70                                 struct ofnode_phandle_args *args)
  71 {
  72         irq->id = args->args[0];
  73
  74         return 0;
  75 }
  76
  77 static __maybe_unused int sandbox_get_acpi(const struct irq *irq,
  78                                            struct acpi_irq *acpi_irq)
  79 {
  80         acpi_irq->pin = irq->id;
  81         acpi_irq->mode = ACPI_IRQ_LEVEL_TRIGGERED;
  82         acpi_irq->polarity = ACPI_IRQ_ACTIVE_HIGH;
  83         acpi_irq->shared = ACPI_IRQ_SHARED;
  84         acpi_irq->wake = ACPI_IRQ_WAKE;
  85
  86         return 0;
  87 }
  88
  89 static const struct irq_ops sandbox_irq_ops = {
  90         .route_pmc_gpio_gpe     = sandbox_route_pmc_gpio_gpe,
  91         .set_polarity           = sandbox_set_polarity,
  92         .snapshot_polarities    = sandbox_snapshot_polarities,
  93         .restore_polarities     = sandbox_restore_polarities,
  94         .read_and_clear         = sandbox_irq_read_and_clear,
  95         .of_xlate               = sandbox_irq_of_xlate,
  96 #if CONFIG_IS_ENABLED(ACPIGEN)
  97         .get_acpi               = sandbox_get_acpi,
  98 #endif
  99 };
 100
 101 static const struct udevice_id sandbox_irq_ids[] = {
 102         { .compatible = "sandbox,irq", SANDBOX_IRQT_BASE },
 103         { }
 104 };
 105
 106 U_BOOT_DRIVER(sandbox_irq_drv) = {
 107         .name           = "sandbox_irq",
 108         .id             = UCLASS_IRQ,
 109         .of_match       = sandbox_irq_ids,
 110         .ops            = &sandbox_irq_ops,
 111         .priv_auto_alloc_size   = sizeof(struct sandbox_irq_priv),
 112 };