drivers/spi/spi-iproc-qspi.c

Source file repositories/reference/linux-study-clean/drivers/spi/spi-iproc-qspi.c

File Facts

System
Linux kernel
Corpus path
drivers/spi/spi-iproc-qspi.c
Extension
.c
Size
3796 bytes
Lines
153
Domain
Driver Families
Bucket
drivers/spi
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 bcm_iproc_intc {
	struct bcm_qspi_soc_intc soc_intc;
	struct platform_device *pdev;
	void __iomem *int_reg;
	void __iomem *int_status_reg;
	spinlock_t soclock;
	bool big_endian;
};

static u32 bcm_iproc_qspi_get_l2_int_status(struct bcm_qspi_soc_intc *soc_intc)
{
	struct bcm_iproc_intc *priv =
			container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
	void __iomem *mmio = priv->int_status_reg;
	int i;
	u32 val = 0, sts = 0;

	for (i = 0; i < INTR_COUNT; i++) {
		if (bcm_qspi_readl(priv->big_endian, mmio + (i * 4)))
			val |= 1UL << i;
	}

	if (val & INTR_MSPI_DONE_MASK)
		sts |= MSPI_DONE;

	if (val & BSPI_LR_INTERRUPTS_ALL)
		sts |= BSPI_DONE;

	if (val & BSPI_LR_INTERRUPTS_ERROR)
		sts |= BSPI_ERR;

	return sts;
}

static void bcm_iproc_qspi_int_ack(struct bcm_qspi_soc_intc *soc_intc, int type)
{
	struct bcm_iproc_intc *priv =
			container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
	void __iomem *mmio = priv->int_status_reg;
	u32 mask = get_qspi_mask(type);
	int i;

	for (i = 0; i < INTR_COUNT; i++) {
		if (mask & (1UL << i))
			bcm_qspi_writel(priv->big_endian, 1, mmio + (i * 4));
	}
}

static void bcm_iproc_qspi_int_set(struct bcm_qspi_soc_intc *soc_intc, int type,
				   bool en)
{
	struct bcm_iproc_intc *priv =
			container_of(soc_intc, struct bcm_iproc_intc, soc_intc);
	void __iomem *mmio = priv->int_reg;
	u32 mask = get_qspi_mask(type);
	u32 val;
	unsigned long flags;

	spin_lock_irqsave(&priv->soclock, flags);

	val = bcm_qspi_readl(priv->big_endian, mmio);

	if (en)
		val = val | (mask << INTR_BASE_BIT_SHIFT);
	else
		val = val & ~(mask << INTR_BASE_BIT_SHIFT);

	bcm_qspi_writel(priv->big_endian, val, mmio);

	spin_unlock_irqrestore(&priv->soclock, flags);
}

static int bcm_iproc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct bcm_iproc_intc *priv;
	struct bcm_qspi_soc_intc *soc_intc;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;
	soc_intc = &priv->soc_intc;
	priv->pdev = pdev;

	spin_lock_init(&priv->soclock);

	priv->int_reg = devm_platform_ioremap_resource_byname(pdev, "intr_regs");
	if (IS_ERR(priv->int_reg))
		return PTR_ERR(priv->int_reg);

Annotation

Implementation Notes