LXR uboot/drivers/misc/irq

   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 */
  20struct sandbox_irq_priv {
  21        int count;
  22        bool pending;
  23};
  24
  25static 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
  33static 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
  41static int sandbox_snapshot_polarities(struct udevice *dev)
  42{
  43        return 0;
  44}
  45
  46static int sandbox_restore_polarities(struct udevice *dev)
  47{
  48        return 0;
  49}
  50
  51static 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
  69static 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
  77static __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
  89static 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
 101static const struct udevice_id sandbox_irq_ids[] = {
 102        { .compatible = "sandbox,irq", SANDBOX_IRQT_BASE },
 103        { }
 104};
 105
 106U_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};
 113