drivers/mtd/nand/raw/brcmnand/bcm6368_nand.c

Source file repositories/reference/linux-study-clean/drivers/mtd/nand/raw/brcmnand/bcm6368_nand.c

File Facts

System
Linux kernel
Corpus path
drivers/mtd/nand/raw/brcmnand/bcm6368_nand.c
Extension
.c
Size
3504 bytes
Lines
132
Domain
Driver Families
Bucket
drivers/mtd
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 bcm6368_nand_soc {
	struct brcmnand_soc soc;
	void __iomem *base;
};

#define BCM6368_NAND_INT		0x00
#define  BCM6368_NAND_STATUS_SHIFT	0
#define  BCM6368_NAND_STATUS_MASK	(0xfff << BCM6368_NAND_STATUS_SHIFT)
#define  BCM6368_NAND_ENABLE_SHIFT	16
#define  BCM6368_NAND_ENABLE_MASK	(0xffff << BCM6368_NAND_ENABLE_SHIFT)
#define BCM6368_NAND_BASE_ADDR0	0x04
#define BCM6368_NAND_BASE_ADDR1	0x0c

enum {
	BCM6368_NP_READ		= BIT(0),
	BCM6368_BLOCK_ERASE	= BIT(1),
	BCM6368_COPY_BACK	= BIT(2),
	BCM6368_PAGE_PGM	= BIT(3),
	BCM6368_CTRL_READY	= BIT(4),
	BCM6368_DEV_RBPIN	= BIT(5),
	BCM6368_ECC_ERR_UNC	= BIT(6),
	BCM6368_ECC_ERR_CORR	= BIT(7),
};

static bool bcm6368_nand_intc_ack(struct brcmnand_soc *soc)
{
	struct bcm6368_nand_soc *priv =
			container_of(soc, struct bcm6368_nand_soc, soc);
	void __iomem *mmio = priv->base + BCM6368_NAND_INT;
	u32 val = brcmnand_readl(mmio);

	if (val & (BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT)) {
		/* Ack interrupt */
		val &= ~BCM6368_NAND_STATUS_MASK;
		val |= BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT;
		brcmnand_writel(val, mmio);
		return true;
	}

	return false;
}

static void bcm6368_nand_intc_set(struct brcmnand_soc *soc, bool en)
{
	struct bcm6368_nand_soc *priv =
			container_of(soc, struct bcm6368_nand_soc, soc);
	void __iomem *mmio = priv->base + BCM6368_NAND_INT;
	u32 val = brcmnand_readl(mmio);

	/* Don't ack any interrupts */
	val &= ~BCM6368_NAND_STATUS_MASK;

	if (en)
		val |= BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT;
	else
		val &= ~(BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT);

	brcmnand_writel(val, mmio);
}

static int bcm6368_nand_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct bcm6368_nand_soc *priv;
	struct brcmnand_soc *soc;

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

	priv->base = devm_platform_ioremap_resource_byname(pdev, "nand-int-base");
	if (IS_ERR(priv->base))
		return PTR_ERR(priv->base);

	soc->ctlrdy_ack = bcm6368_nand_intc_ack;
	soc->ctlrdy_set_enabled = bcm6368_nand_intc_set;

	/* Disable and ack all interrupts  */
	brcmnand_writel(0, priv->base + BCM6368_NAND_INT);
	brcmnand_writel(BCM6368_NAND_STATUS_MASK,
			priv->base + BCM6368_NAND_INT);

	return brcmnand_probe(pdev, soc);
}

static const struct of_device_id bcm6368_nand_of_match[] = {
	{ .compatible = "brcm,nand-bcm6368" },
	{},
};

Annotation

Implementation Notes