drivers/net/dsa/vitesse-vsc73xx-platform.c

Source file repositories/reference/linux-study-clean/drivers/net/dsa/vitesse-vsc73xx-platform.c

File Facts

System
Linux kernel
Corpus path
drivers/net/dsa/vitesse-vsc73xx-platform.c
Extension
.c
Size
4618 bytes
Lines
173
Domain
Driver Families
Bucket
drivers/net
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 vsc73xx_platform {
	struct platform_device	*pdev;
	void __iomem		*base_addr;
	struct vsc73xx		vsc;
};

static const struct vsc73xx_ops vsc73xx_platform_ops;

static u32 vsc73xx_make_addr(u8 block, u8 subblock, u8 reg)
{
	u32 ret;

	ret = (block & VSC73XX_CMD_PLATFORM_BLOCK_MASK)
	    << VSC73XX_CMD_PLATFORM_BLOCK_SHIFT;
	ret |= (subblock & VSC73XX_CMD_PLATFORM_SUBBLOCK_MASK)
	    << VSC73XX_CMD_PLATFORM_SUBBLOCK_SHIFT;
	ret |= reg << VSC73XX_CMD_PLATFORM_REGISTER_SHIFT;

	return ret;
}

static int vsc73xx_platform_read(struct vsc73xx *vsc, u8 block, u8 subblock,
				 u8 reg, u32 *val)
{
	struct vsc73xx_platform *vsc_platform = vsc->priv;
	u32 offset;

	if (!vsc73xx_is_addr_valid(block, subblock))
		return -EINVAL;

	offset = vsc73xx_make_addr(block, subblock, reg);
	/* By default vsc73xx running in big-endian mode.
	 * (See "Register Addressing" section 5.5.3 in the VSC7385 manual.)
	 */
	*val = ioread32be(vsc_platform->base_addr + offset);

	return 0;
}

static int vsc73xx_platform_write(struct vsc73xx *vsc, u8 block, u8 subblock,
				  u8 reg, u32 val)
{
	struct vsc73xx_platform *vsc_platform = vsc->priv;
	u32 offset;

	if (!vsc73xx_is_addr_valid(block, subblock))
		return -EINVAL;

	offset = vsc73xx_make_addr(block, subblock, reg);
	iowrite32be(val, vsc_platform->base_addr + offset);

	return 0;
}

static int vsc73xx_platform_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct vsc73xx_platform *vsc_platform;
	int ret;

	vsc_platform = devm_kzalloc(dev, sizeof(*vsc_platform), GFP_KERNEL);
	if (!vsc_platform)
		return -ENOMEM;

	platform_set_drvdata(pdev, vsc_platform);
	vsc_platform->pdev = pdev;
	vsc_platform->vsc.dev = dev;
	vsc_platform->vsc.priv = vsc_platform;
	vsc_platform->vsc.ops = &vsc73xx_platform_ops;

	/* obtain I/O memory space */
	vsc_platform->base_addr = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(vsc_platform->base_addr)) {
		dev_err(&pdev->dev, "cannot request I/O memory space\n");
		ret = -ENXIO;
		return ret;
	}

	return vsc73xx_probe(&vsc_platform->vsc);
}

static void vsc73xx_platform_remove(struct platform_device *pdev)
{
	struct vsc73xx_platform *vsc_platform = platform_get_drvdata(pdev);

	if (!vsc_platform)
		return;

	vsc73xx_remove(&vsc_platform->vsc);
}

Annotation

Implementation Notes