1 // SPDX-License-Identifier: GPL-2.0-only
3 * This file implements handling of
4 * Arm Generic Diagnostic Dump and Reset Interface table (AGDI)
6 * Copyright (c) 2022, Ampere Computing LLC
9 #define pr_fmt(fmt) "ACPI: AGDI: " fmt
11 #include <linux/acpi.h>
12 #include <linux/acpi_agdi.h>
13 #include <linux/arm_sdei.h>
15 #include <linux/kernel.h>
16 #include <linux/platform_device.h>
22 static int agdi_sdei_handler(u32 sdei_event, struct pt_regs *regs, void *arg)
24 nmi_panic(regs, "Arm Generic Diagnostic Dump and Reset SDEI event issued");
28 static int agdi_sdei_probe(struct platform_device *pdev,
29 struct agdi_data *adata)
33 err = sdei_event_register(adata->sdei_event, agdi_sdei_handler, pdev);
35 dev_err(&pdev->dev, "Failed to register for SDEI event %d",
40 err = sdei_event_enable(adata->sdei_event);
42 sdei_event_unregister(adata->sdei_event);
43 dev_err(&pdev->dev, "Failed to enable event %d\n",
51 static int agdi_probe(struct platform_device *pdev)
53 struct agdi_data *adata = dev_get_platdata(&pdev->dev);
58 return agdi_sdei_probe(pdev, adata);
61 static int agdi_remove(struct platform_device *pdev)
63 struct agdi_data *adata = dev_get_platdata(&pdev->dev);
66 err = sdei_event_disable(adata->sdei_event);
70 for (i = 0; i < 3; i++) {
71 err = sdei_event_unregister(adata->sdei_event);
72 if (err != -EINPROGRESS)
81 static struct platform_driver agdi_driver = {
86 .remove = agdi_remove,
89 void __init acpi_agdi_init(void)
91 struct acpi_table_agdi *agdi_table;
92 struct agdi_data pdata;
93 struct platform_device *pdev;
96 status = acpi_get_table(ACPI_SIG_AGDI, 0,
97 (struct acpi_table_header **) &agdi_table);
98 if (ACPI_FAILURE(status))
101 if (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE) {
102 pr_warn("Interrupt signaling is not supported");
106 pdata.sdei_event = agdi_table->sdei_event;
108 pdev = platform_device_register_data(NULL, "agdi", 0, &pdata, sizeof(pdata));
112 if (platform_driver_register(&agdi_driver))
113 platform_device_unregister(pdev);
116 acpi_put_table((struct acpi_table_header *)agdi_table);