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117 lines
2.4 KiB
117 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* This file implements handling of |
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* Arm Generic Diagnostic Dump and Reset Interface table (AGDI) |
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* |
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* Copyright (c) 2022, Ampere Computing LLC |
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*/ |
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#define pr_fmt(fmt) "ACPI: AGDI: " fmt |
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#include <linux/acpi.h> |
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#include <linux/acpi_agdi.h> |
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#include <linux/arm_sdei.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/platform_device.h> |
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struct agdi_data { |
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int sdei_event; |
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}; |
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static int agdi_sdei_handler(u32 sdei_event, struct pt_regs *regs, void *arg) |
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{ |
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nmi_panic(regs, "Arm Generic Diagnostic Dump and Reset SDEI event issued"); |
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return 0; |
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} |
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static int agdi_sdei_probe(struct platform_device *pdev, |
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struct agdi_data *adata) |
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{ |
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int err; |
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err = sdei_event_register(adata->sdei_event, agdi_sdei_handler, pdev); |
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if (err) { |
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dev_err(&pdev->dev, "Failed to register for SDEI event %d", |
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adata->sdei_event); |
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return err; |
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} |
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err = sdei_event_enable(adata->sdei_event); |
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if (err) { |
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sdei_event_unregister(adata->sdei_event); |
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dev_err(&pdev->dev, "Failed to enable event %d\n", |
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adata->sdei_event); |
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return err; |
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} |
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return 0; |
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} |
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static int agdi_probe(struct platform_device *pdev) |
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{ |
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struct agdi_data *adata = dev_get_platdata(&pdev->dev); |
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if (!adata) |
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return -EINVAL; |
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return agdi_sdei_probe(pdev, adata); |
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} |
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static int agdi_remove(struct platform_device *pdev) |
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{ |
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struct agdi_data *adata = dev_get_platdata(&pdev->dev); |
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int err, i; |
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err = sdei_event_disable(adata->sdei_event); |
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if (err) |
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return err; |
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for (i = 0; i < 3; i++) { |
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err = sdei_event_unregister(adata->sdei_event); |
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if (err != -EINPROGRESS) |
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break; |
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schedule(); |
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} |
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return err; |
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} |
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static struct platform_driver agdi_driver = { |
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.driver = { |
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.name = "agdi", |
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}, |
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.probe = agdi_probe, |
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.remove = agdi_remove, |
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}; |
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void __init acpi_agdi_init(void) |
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{ |
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struct acpi_table_agdi *agdi_table; |
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struct agdi_data pdata; |
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struct platform_device *pdev; |
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acpi_status status; |
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status = acpi_get_table(ACPI_SIG_AGDI, 0, |
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(struct acpi_table_header **) &agdi_table); |
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if (ACPI_FAILURE(status)) |
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return; |
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if (agdi_table->flags & ACPI_AGDI_SIGNALING_MODE) { |
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pr_warn("Interrupt signaling is not supported"); |
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goto err_put_table; |
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} |
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pdata.sdei_event = agdi_table->sdei_event; |
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pdev = platform_device_register_data(NULL, "agdi", 0, &pdata, sizeof(pdata)); |
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if (IS_ERR(pdev)) |
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goto err_put_table; |
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if (platform_driver_register(&agdi_driver)) |
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platform_device_unregister(pdev); |
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err_put_table: |
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acpi_put_table((struct acpi_table_header *)agdi_table); |
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}
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