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