drivers/media/platform/ti/vpe/vpdma.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/ti/vpe/vpdma.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/ti/vpe/vpdma.c
Extension
.c
Size
31615 bytes
Lines
1195
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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 vpdma_channel_info {
	int num;		/* VPDMA channel number */
	int cstat_offset;	/* client CSTAT register offset */
};

static const struct vpdma_channel_info chan_info[] = {
	[VPE_CHAN_LUMA1_IN] = {
		.num		= VPE_CHAN_NUM_LUMA1_IN,
		.cstat_offset	= VPDMA_DEI_LUMA1_CSTAT,
	},
	[VPE_CHAN_CHROMA1_IN] = {
		.num		= VPE_CHAN_NUM_CHROMA1_IN,
		.cstat_offset	= VPDMA_DEI_CHROMA1_CSTAT,
	},
	[VPE_CHAN_LUMA2_IN] = {
		.num		= VPE_CHAN_NUM_LUMA2_IN,
		.cstat_offset	= VPDMA_DEI_LUMA2_CSTAT,
	},
	[VPE_CHAN_CHROMA2_IN] = {
		.num		= VPE_CHAN_NUM_CHROMA2_IN,
		.cstat_offset	= VPDMA_DEI_CHROMA2_CSTAT,
	},
	[VPE_CHAN_LUMA3_IN] = {
		.num		= VPE_CHAN_NUM_LUMA3_IN,
		.cstat_offset	= VPDMA_DEI_LUMA3_CSTAT,
	},
	[VPE_CHAN_CHROMA3_IN] = {
		.num		= VPE_CHAN_NUM_CHROMA3_IN,
		.cstat_offset	= VPDMA_DEI_CHROMA3_CSTAT,
	},
	[VPE_CHAN_MV_IN] = {
		.num		= VPE_CHAN_NUM_MV_IN,
		.cstat_offset	= VPDMA_DEI_MV_IN_CSTAT,
	},
	[VPE_CHAN_MV_OUT] = {
		.num		= VPE_CHAN_NUM_MV_OUT,
		.cstat_offset	= VPDMA_DEI_MV_OUT_CSTAT,
	},
	[VPE_CHAN_LUMA_OUT] = {
		.num		= VPE_CHAN_NUM_LUMA_OUT,
		.cstat_offset	= VPDMA_VIP_UP_Y_CSTAT,
	},
	[VPE_CHAN_CHROMA_OUT] = {
		.num		= VPE_CHAN_NUM_CHROMA_OUT,
		.cstat_offset	= VPDMA_VIP_UP_UV_CSTAT,
	},
	[VPE_CHAN_RGB_OUT] = {
		.num		= VPE_CHAN_NUM_RGB_OUT,
		.cstat_offset	= VPDMA_VIP_UP_Y_CSTAT,
	},
};

static u32 read_reg(struct vpdma_data *vpdma, int offset)
{
	return ioread32(vpdma->base + offset);
}

static void write_reg(struct vpdma_data *vpdma, int offset, u32 value)
{
	iowrite32(value, vpdma->base + offset);
}

static int read_field_reg(struct vpdma_data *vpdma, int offset,
		u32 mask, int shift)
{
	return (read_reg(vpdma, offset) & (mask << shift)) >> shift;
}

static void write_field_reg(struct vpdma_data *vpdma, int offset, u32 field,
		u32 mask, int shift)
{
	u32 val = read_reg(vpdma, offset);

	val &= ~(mask << shift);
	val |= (field & mask) << shift;

	write_reg(vpdma, offset, val);
}

void vpdma_dump_regs(struct vpdma_data *vpdma)
{
	struct device *dev = &vpdma->pdev->dev;

#define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, read_reg(vpdma, VPDMA_##r))

	dev_dbg(dev, "VPDMA Registers:\n");

	DUMPREG(PID);
	DUMPREG(LIST_ADDR);
	DUMPREG(LIST_ATTR);

Annotation

Implementation Notes