drivers/soc/fujitsu/a64fx-diag.c

Source file repositories/reference/linux-study-clean/drivers/soc/fujitsu/a64fx-diag.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/fujitsu/a64fx-diag.c
Extension
.c
Size
3641 bytes
Lines
152
Domain
Driver Families
Bucket
drivers/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct a64fx_diag_priv {
	void __iomem *mmsc_reg_base;
	int irq;
	bool has_nmi;
};

static irqreturn_t a64fx_diag_handler_nmi(int irq, void *dev_id)
{
	nmi_panic(NULL, "a64fx_diag: interrupt received\n");

	return IRQ_HANDLED;
}

static irqreturn_t a64fx_diag_handler_irq(int irq, void *dev_id)
{
	panic("a64fx_diag: interrupt received\n");

	return IRQ_HANDLED;
}

static void a64fx_diag_interrupt_clear(struct a64fx_diag_priv *priv)
{
	void __iomem *diag_status_reg_addr;
	u32 mmsc;

	diag_status_reg_addr = priv->mmsc_reg_base + BMC_DIAG_INTERRUPT_STATUS;
	mmsc = readl(diag_status_reg_addr);
	if (mmsc & BMC_DIAG_INTERRUPT_MASK)
		writel(BMC_DIAG_INTERRUPT_MASK, diag_status_reg_addr);
}

static void a64fx_diag_interrupt_enable(struct a64fx_diag_priv *priv)
{
	void __iomem *diag_enable_reg_addr;
	u32 mmsc;

	diag_enable_reg_addr = priv->mmsc_reg_base + BMC_DIAG_INTERRUPT_ENABLE;
	mmsc = readl(diag_enable_reg_addr);
	if (!(mmsc & BMC_DIAG_INTERRUPT_MASK)) {
		mmsc |= BMC_DIAG_INTERRUPT_MASK;
		writel(mmsc, diag_enable_reg_addr);
	}
}

static void a64fx_diag_interrupt_disable(struct a64fx_diag_priv *priv)
{
	void __iomem *diag_enable_reg_addr;
	u32 mmsc;

	diag_enable_reg_addr = priv->mmsc_reg_base + BMC_DIAG_INTERRUPT_ENABLE;
	mmsc = readl(diag_enable_reg_addr);
	if (mmsc & BMC_DIAG_INTERRUPT_MASK) {
		mmsc &= ~BMC_DIAG_INTERRUPT_MASK;
		writel(mmsc, diag_enable_reg_addr);
	}
}

static int a64fx_diag_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct a64fx_diag_priv *priv;
	unsigned long irq_flags;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (priv == NULL)
		return -ENOMEM;

	priv->mmsc_reg_base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(priv->mmsc_reg_base))
		return PTR_ERR(priv->mmsc_reg_base);

	priv->irq = platform_get_irq(pdev, A64FX_DIAG_IRQ);
	if (priv->irq < 0)
		return priv->irq;

	platform_set_drvdata(pdev, priv);

	irq_flags = IRQF_PERCPU | IRQF_NOBALANCING | IRQF_NO_AUTOEN |
		   IRQF_NO_THREAD;
	ret = request_nmi(priv->irq, &a64fx_diag_handler_nmi, irq_flags,
			"a64fx_diag_nmi", NULL);
	if (ret) {
		ret = request_irq(priv->irq, &a64fx_diag_handler_irq,
				irq_flags, "a64fx_diag_irq", NULL);
		if (ret) {
			dev_err(dev, "cannot register IRQ %d\n", ret);
			return ret;
		}
		enable_irq(priv->irq);

Annotation

Implementation Notes