drivers/media/platform/renesas/sh_vou.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/renesas/sh_vou.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/renesas/sh_vou.c
Extension
.c
Size
37483 bytes
Lines
1373
Domain
Driver Families
Bucket
drivers/media
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 sh_vou_buffer {
	struct vb2_v4l2_buffer vb;
	struct list_head list;
};

static inline struct
sh_vou_buffer *to_sh_vou_buffer(struct vb2_v4l2_buffer *vb2)
{
	return container_of(vb2, struct sh_vou_buffer, vb);
}

struct sh_vou_device {
	struct v4l2_device v4l2_dev;
	struct video_device vdev;
	struct sh_vou_pdata *pdata;
	spinlock_t lock;
	void __iomem *base;
	/* State information */
	struct v4l2_pix_format pix;
	struct v4l2_rect rect;
	struct list_head buf_list;
	v4l2_std_id std;
	int pix_idx;
	struct vb2_queue queue;
	struct sh_vou_buffer *active;
	enum sh_vou_status status;
	unsigned sequence;
	struct mutex fop_lock;
};

/* Register access routines for sides A, B and mirror addresses */
static void sh_vou_reg_a_write(struct sh_vou_device *vou_dev, unsigned int reg,
			       u32 value)
{
	__raw_writel(value, vou_dev->base + reg);
}

static void sh_vou_reg_ab_write(struct sh_vou_device *vou_dev, unsigned int reg,
				u32 value)
{
	__raw_writel(value, vou_dev->base + reg);
	__raw_writel(value, vou_dev->base + reg + 0x1000);
}

static void sh_vou_reg_m_write(struct sh_vou_device *vou_dev, unsigned int reg,
			       u32 value)
{
	__raw_writel(value, vou_dev->base + reg + 0x2000);
}

static u32 sh_vou_reg_a_read(struct sh_vou_device *vou_dev, unsigned int reg)
{
	return __raw_readl(vou_dev->base + reg);
}

static void sh_vou_reg_a_set(struct sh_vou_device *vou_dev, unsigned int reg,
			     u32 value, u32 mask)
{
	u32 old = __raw_readl(vou_dev->base + reg);

	value = (value & mask) | (old & ~mask);
	__raw_writel(value, vou_dev->base + reg);
}

static void sh_vou_reg_b_set(struct sh_vou_device *vou_dev, unsigned int reg,
			     u32 value, u32 mask)
{
	sh_vou_reg_a_set(vou_dev, reg + 0x1000, value, mask);
}

static void sh_vou_reg_ab_set(struct sh_vou_device *vou_dev, unsigned int reg,
			      u32 value, u32 mask)
{
	sh_vou_reg_a_set(vou_dev, reg, value, mask);
	sh_vou_reg_b_set(vou_dev, reg, value, mask);
}

struct sh_vou_fmt {
	u32		pfmt;
	unsigned char	bpp;
	unsigned char	bpl;
	unsigned char	rgb;
	unsigned char	yf;
	unsigned char	pkf;
};

/* Further pixel formats can be added */
static struct sh_vou_fmt vou_fmt[] = {
	{
		.pfmt	= V4L2_PIX_FMT_NV12,

Annotation

Implementation Notes