drivers/media/platform/samsung/s5p-jpeg/jpeg-hw-s5p.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/samsung/s5p-jpeg/jpeg-hw-s5p.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/samsung/s5p-jpeg/jpeg-hw-s5p.c
Extension
.c
Size
7022 bytes
Lines
306
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

// SPDX-License-Identifier: GPL-2.0-only
/* linux/drivers/media/platform/samsung/s5p-jpeg/jpeg-hw.h
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 *
 * Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
 */

#include <linux/io.h>
#include <linux/videodev2.h>

#include "jpeg-core.h"
#include "jpeg-regs.h"
#include "jpeg-hw-s5p.h"

void s5p_jpeg_reset(void __iomem *regs)
{
	unsigned long reg;

	writel(1, regs + S5P_JPG_SW_RESET);
	reg = readl(regs + S5P_JPG_SW_RESET);
	/* no other way but polling for when JPEG IP becomes operational */
	while (reg != 0) {
		cpu_relax();
		reg = readl(regs + S5P_JPG_SW_RESET);
	}
}

void s5p_jpeg_poweron(void __iomem *regs)
{
	writel(S5P_POWER_ON, regs + S5P_JPGCLKCON);
}

void s5p_jpeg_input_raw_mode(void __iomem *regs, unsigned long mode)
{
	unsigned long reg, m;

	m = S5P_MOD_SEL_565;
	if (mode == S5P_JPEG_RAW_IN_565)
		m = S5P_MOD_SEL_565;
	else if (mode == S5P_JPEG_RAW_IN_422)
		m = S5P_MOD_SEL_422;

	reg = readl(regs + S5P_JPGCMOD);
	reg &= ~S5P_MOD_SEL_MASK;
	reg |= m;
	writel(reg, regs + S5P_JPGCMOD);
}

void s5p_jpeg_proc_mode(void __iomem *regs, unsigned long mode)
{
	unsigned long reg, m;

	if (mode == S5P_JPEG_ENCODE)
		m = S5P_PROC_MODE_COMPR;
	else
		m = S5P_PROC_MODE_DECOMPR;
	reg = readl(regs + S5P_JPGMOD);
	reg &= ~S5P_PROC_MODE_MASK;
	reg |= m;
	writel(reg, regs + S5P_JPGMOD);
}

void s5p_jpeg_subsampling_mode(void __iomem *regs, unsigned int mode)
{
	unsigned long reg, m;

	if (mode == V4L2_JPEG_CHROMA_SUBSAMPLING_420)
		m = S5P_SUBSAMPLING_MODE_420;
	else
		m = S5P_SUBSAMPLING_MODE_422;

	reg = readl(regs + S5P_JPGMOD);
	reg &= ~S5P_SUBSAMPLING_MODE_MASK;
	reg |= m;
	writel(reg, regs + S5P_JPGMOD);
}

unsigned int s5p_jpeg_get_subsampling_mode(void __iomem *regs)
{
	return readl(regs + S5P_JPGMOD) & S5P_SUBSAMPLING_MODE_MASK;
}

void s5p_jpeg_dri(void __iomem *regs, unsigned int dri)
{
	unsigned long reg;

	reg = readl(regs + S5P_JPGDRI_U);
	reg &= ~0xff;

Annotation

Implementation Notes