155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* A64FX diag driver.
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* Copyright (c) 2022 Fujitsu Ltd.
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*/
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#include <linux/acpi.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#define A64FX_DIAG_IRQ 1
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#define BMC_DIAG_INTERRUPT_ENABLE 0x40
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#define BMC_DIAG_INTERRUPT_STATUS 0x44
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#define BMC_DIAG_INTERRUPT_MASK BIT(31)
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struct a64fx_diag_priv {
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void __iomem *mmsc_reg_base;
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int irq;
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bool has_nmi;
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};
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static irqreturn_t a64fx_diag_handler_nmi(int irq, void *dev_id)
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{
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nmi_panic(NULL, "a64fx_diag: interrupt received\n");
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return IRQ_HANDLED;
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}
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static irqreturn_t a64fx_diag_handler_irq(int irq, void *dev_id)
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{
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panic("a64fx_diag: interrupt received\n");
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return IRQ_HANDLED;
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}
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static void a64fx_diag_interrupt_clear(struct a64fx_diag_priv *priv)
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{
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void __iomem *diag_status_reg_addr;
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u32 mmsc;
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diag_status_reg_addr = priv->mmsc_reg_base + BMC_DIAG_INTERRUPT_STATUS;
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mmsc = readl(diag_status_reg_addr);
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if (mmsc & BMC_DIAG_INTERRUPT_MASK)
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writel(BMC_DIAG_INTERRUPT_MASK, diag_status_reg_addr);
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}
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static void a64fx_diag_interrupt_enable(struct a64fx_diag_priv *priv)
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{
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void __iomem *diag_enable_reg_addr;
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u32 mmsc;
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diag_enable_reg_addr = priv->mmsc_reg_base + BMC_DIAG_INTERRUPT_ENABLE;
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mmsc = readl(diag_enable_reg_addr);
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if (!(mmsc & BMC_DIAG_INTERRUPT_MASK)) {
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mmsc |= BMC_DIAG_INTERRUPT_MASK;
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writel(mmsc, diag_enable_reg_addr);
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}
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}
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static void a64fx_diag_interrupt_disable(struct a64fx_diag_priv *priv)
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{
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void __iomem *diag_enable_reg_addr;
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u32 mmsc;
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diag_enable_reg_addr = priv->mmsc_reg_base + BMC_DIAG_INTERRUPT_ENABLE;
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mmsc = readl(diag_enable_reg_addr);
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if (mmsc & BMC_DIAG_INTERRUPT_MASK) {
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mmsc &= ~BMC_DIAG_INTERRUPT_MASK;
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writel(mmsc, diag_enable_reg_addr);
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}
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}
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static int a64fx_diag_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct a64fx_diag_priv *priv;
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unsigned long irq_flags;
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int ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (priv == NULL)
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return -ENOMEM;
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priv->mmsc_reg_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(priv->mmsc_reg_base))
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return PTR_ERR(priv->mmsc_reg_base);
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priv->irq = platform_get_irq(pdev, A64FX_DIAG_IRQ);
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if (priv->irq < 0)
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return priv->irq;
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platform_set_drvdata(pdev, priv);
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irq_flags = IRQF_PERCPU | IRQF_NOBALANCING | IRQF_NO_AUTOEN |
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IRQF_NO_THREAD;
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ret = request_nmi(priv->irq, &a64fx_diag_handler_nmi, irq_flags,
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"a64fx_diag_nmi", NULL);
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if (ret) {
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ret = request_irq(priv->irq, &a64fx_diag_handler_irq,
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irq_flags, "a64fx_diag_irq", NULL);
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if (ret) {
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dev_err(dev, "cannot register IRQ %d\n", ret);
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return ret;
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}
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enable_irq(priv->irq);
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} else {
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enable_nmi(priv->irq);
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priv->has_nmi = true;
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}
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a64fx_diag_interrupt_clear(priv);
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a64fx_diag_interrupt_enable(priv);
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return 0;
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}
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static int a64fx_diag_remove(struct platform_device *pdev)
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{
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struct a64fx_diag_priv *priv = platform_get_drvdata(pdev);
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a64fx_diag_interrupt_disable(priv);
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a64fx_diag_interrupt_clear(priv);
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if (priv->has_nmi)
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free_nmi(priv->irq, NULL);
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else
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free_irq(priv->irq, NULL);
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return 0;
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}
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static const struct acpi_device_id a64fx_diag_acpi_match[] = {
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{ "FUJI2007", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, a64fx_diag_acpi_match);
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static struct platform_driver a64fx_diag_driver = {
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.driver = {
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.name = "a64fx_diag_driver",
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.acpi_match_table = ACPI_PTR(a64fx_diag_acpi_match),
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},
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.probe = a64fx_diag_probe,
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.remove = a64fx_diag_remove,
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};
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module_platform_driver(a64fx_diag_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Hitomi Hasegawa <hasegawa-hitomi@fujitsu.com>");
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MODULE_DESCRIPTION("A64FX diag driver");
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