| @@ -0,0 +1,116 @@ |
| 1 | +// SPDX-License-Identifier: GPL-2.0-only |
| 2 | +/* |
| 3 | + * This file implements handling of |
| 4 | + * Arm Generic Diagnostic Dump and Reset Interface table (AGDI) |
| 5 | + * |
| 6 | + * Copyright (c) 2022, Ampere Computing LLC |
| 7 | + */ |
| 8 | + |
| 9 | +#define pr_fmt(fmt) "ACPI: AGDI: " fmt |
| 10 | + |
| 11 | +#include <linux/acpi.h> |
| 12 | +#include <linux/arm_sdei.h> |
| 13 | +#include <linux/io.h> |
| 14 | +#include <linux/kernel.h> |
| 15 | +#include <linux/platform_device.h> |
| 16 | + |
| 17 | +struct agdi_data { |
| 18 | + int sdei_event; |
| 19 | +}; |
| 20 | + |
| 21 | +static int agdi_sdei_handler(u32 sdei_event, struct pt_regs *regs, void *arg) |
| 22 | +{ |
| 23 | + nmi_panic(regs, "Arm Generic Diagnostic Dump and Reset SDEI event issued"); |
| 24 | + return 0; |
| 25 | +} |
| 26 | + |
| 27 | +static int agdi_sdei_probe(struct platform_device *pdev, |
| 28 | + struct agdi_data *adata) |
| 29 | +{ |
| 30 | + int err; |
| 31 | + |
| 32 | + err = sdei_event_register(adata->sdei_event, agdi_sdei_handler, pdev); |
| 33 | + if (err) { |
| 34 | + dev_err(&pdev->dev, "Failed to register for SDEI event %d", |
| 35 | + adata->sdei_event); |
| 36 | + return err; |
| 37 | + } |
| 38 | + |
| 39 | + err = sdei_event_enable(adata->sdei_event); |
| 40 | + if (err) { |
| 41 | + sdei_event_unregister(adata->sdei_event); |
| 42 | + dev_err(&pdev->dev, "Failed to enable event %d\n", |
| 43 | + adata->sdei_event); |
| 44 | + return err; |
| 45 | + } |
| 46 | + |
| 47 | + return 0; |
| 48 | +} |
| 49 | + |
| 50 | +static int agdi_probe(struct platform_device *pdev) |
| 51 | +{ |
| 52 | + struct agdi_data *adata = dev_get_platdata(&pdev->dev); |
| 53 | + |
| 54 | + if (!adata) |
| 55 | + return -EINVAL; |
| 56 | + |
| 57 | + return agdi_sdei_probe(pdev, adata); |
| 58 | +} |
| 59 | + |
| 60 | +static int agdi_remove(struct platform_device *pdev) |
| 61 | +{ |
| 62 | + struct agdi_data *adata = dev_get_platdata(&pdev->dev); |
| 63 | + int err, i; |
| 64 | + |
| 65 | + err = sdei_event_disable(adata->sdei_event); |
| 66 | + if (err) |
| 67 | + return err; |
| 68 | + |
| 69 | + for (i = 0; i < 3; i++) { |
| 70 | + err = sdei_event_unregister(adata->sdei_event); |
| 71 | + if (err != -EINPROGRESS) |
| 72 | + break; |
| 73 | + |
| 74 | + schedule(); |
| 75 | + } |
| 76 | + |
| 77 | + return err; |
| 78 | +} |
| 79 | + |
| 80 | +static struct platform_driver agdi_driver = { |
| 81 | + .driver = { |
| 82 | + .name = "agdi", |
| 83 | + }, |
| 84 | + .probe = agdi_probe, |
| 85 | + .remove = agdi_remove, |
| 86 | +}; |
| 87 | + |
| 88 | +void __init acpi_agdi_init(void) |
| 89 | +{ |
| 90 | + struct acpi_table_agdi *agdi_table; |
| 91 | + struct agdi_data pdata; |
| 92 | + struct platform_device *pdev; |
| 93 | + acpi_status status; |
| 94 | + |
| 95 | + status = acpi_get_table(ACPI_SIG_AGDI, 0, |
| 96 | + (struct acpi_table_header **) &agdi_table); |
| 97 | + if (ACPI_FAILURE(status)) |
| 98 | + return; |
| 99 | + |
| 100 | + if (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE) { |
| 101 | + pr_warn("Interrupt signaling is not supported"); |
| 102 | + goto err_put_table; |
| 103 | + } |
| 104 | + |
| 105 | + pdata.sdei_event = agdi_table->sdei_event; |
| 106 | + |
| 107 | + pdev = platform_device_register_data(NULL, "agdi", 0, &pdata, sizeof(pdata)); |
| 108 | + if (IS_ERR(pdev)) |
| 109 | + goto err_put_table; |
| 110 | + |
| 111 | + if (platform_driver_register(&agdi_driver)) |
| 112 | + platform_device_unregister(pdev); |
| 113 | + |
| 114 | +err_put_table: |
| 115 | + acpi_put_table((struct acpi_table_header *)agdi_table); |
| 116 | +} |