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
sandbox_set_polarity(struct udevice * dev,uint irq,bool active_low)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
sandbox_route_pmc_gpio_gpe(struct udevice * dev,uint pmc_gpe_num)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
sandbox_snapshot_polarities(struct udevice * dev)41 static int sandbox_snapshot_polarities(struct udevice *dev)
42 {
43 return 0;
44 }
45
sandbox_restore_polarities(struct udevice * dev)46 static int sandbox_restore_polarities(struct udevice *dev)
47 {
48 return 0;
49 }
50
sandbox_irq_read_and_clear(struct irq * irq)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
sandbox_irq_of_xlate(struct irq * irq,struct ofnode_phandle_args * args)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
sandbox_get_acpi(const struct irq * irq,struct acpi_irq * acpi_irq)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 = sizeof(struct sandbox_irq_priv),
112 };
113