drivers/media/platform/samsung/s5p-jpeg/jpeg-hw-exynos4.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/samsung/s5p-jpeg/jpeg-hw-exynos4.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/samsung/s5p-jpeg/jpeg-hw-exynos4.c
Extension
.c
Size
7837 bytes
Lines
303
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
/* Copyright (c) 2013 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com/
 *
 * Author: Jacek Anaszewski <j.anaszewski@samsung.com>
 *
 * Register interface file for JPEG driver on Exynos4x12.
 */
#include <linux/io.h>
#include <linux/delay.h>

#include "jpeg-core.h"
#include "jpeg-hw-exynos4.h"
#include "jpeg-regs.h"

void exynos4_jpeg_sw_reset(void __iomem *base)
{
	unsigned int reg;

	reg = readl(base + EXYNOS4_JPEG_CNTL_REG);
	writel(reg & ~(EXYNOS4_DEC_MODE | EXYNOS4_ENC_MODE),
				base + EXYNOS4_JPEG_CNTL_REG);

	reg = readl(base + EXYNOS4_JPEG_CNTL_REG);
	writel(reg & ~EXYNOS4_SOFT_RESET_HI, base + EXYNOS4_JPEG_CNTL_REG);

	udelay(100);

	writel(reg | EXYNOS4_SOFT_RESET_HI, base + EXYNOS4_JPEG_CNTL_REG);
}

void exynos4_jpeg_set_enc_dec_mode(void __iomem *base, unsigned int mode)
{
	unsigned int reg;

	reg = readl(base + EXYNOS4_JPEG_CNTL_REG);
	/* set exynos4_jpeg mod register */
	if (mode == S5P_JPEG_DECODE) {
		writel((reg & EXYNOS4_ENC_DEC_MODE_MASK) |
					EXYNOS4_DEC_MODE,
			base + EXYNOS4_JPEG_CNTL_REG);
	} else if (mode == S5P_JPEG_ENCODE) {/* encode */
		writel((reg & EXYNOS4_ENC_DEC_MODE_MASK) |
					EXYNOS4_ENC_MODE,
			base + EXYNOS4_JPEG_CNTL_REG);
	} else { /* disable both */
		writel(reg & EXYNOS4_ENC_DEC_MODE_MASK,
			base + EXYNOS4_JPEG_CNTL_REG);
	}
}

void __exynos4_jpeg_set_img_fmt(void __iomem *base, unsigned int img_fmt,
				unsigned int version)
{
	unsigned int reg;
	unsigned int exynos4_swap_chroma_cbcr;
	unsigned int exynos4_swap_chroma_crcb;

	if (version == SJPEG_EXYNOS4) {
		exynos4_swap_chroma_cbcr = EXYNOS4_SWAP_CHROMA_CBCR;
		exynos4_swap_chroma_crcb = EXYNOS4_SWAP_CHROMA_CRCB;
	} else {
		exynos4_swap_chroma_cbcr = EXYNOS5433_SWAP_CHROMA_CBCR;
		exynos4_swap_chroma_crcb = EXYNOS5433_SWAP_CHROMA_CRCB;
	}

	reg = readl(base + EXYNOS4_IMG_FMT_REG) &
			EXYNOS4_ENC_IN_FMT_MASK; /* clear except enc format */

	switch (img_fmt) {
	case V4L2_PIX_FMT_GREY:
		reg = reg | EXYNOS4_ENC_GRAY_IMG | EXYNOS4_GRAY_IMG_IP;
		break;
	case V4L2_PIX_FMT_RGB32:
		reg = reg | EXYNOS4_ENC_RGB_IMG |
				EXYNOS4_RGB_IP_RGB_32BIT_IMG;
		break;
	case V4L2_PIX_FMT_RGB565:
		reg = reg | EXYNOS4_ENC_RGB_IMG |
				EXYNOS4_RGB_IP_RGB_16BIT_IMG;
		break;
	case V4L2_PIX_FMT_NV24:
		reg = reg | EXYNOS4_ENC_YUV_444_IMG |
				EXYNOS4_YUV_444_IP_YUV_444_2P_IMG |
				exynos4_swap_chroma_cbcr;
		break;
	case V4L2_PIX_FMT_NV42:
		reg = reg | EXYNOS4_ENC_YUV_444_IMG |
				EXYNOS4_YUV_444_IP_YUV_444_2P_IMG |
				exynos4_swap_chroma_crcb;

Annotation

Implementation Notes