path: root/drivers/media/video/davinci/dm644x_ccdc.c

/*
 * Copyright (C) 2006-2009 Texas Instruments Inc
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * CCDC hardware module for DM6446
 * ------------------------------
 *
 * This module is for configuring CCD controller of DM6446 VPFE to capture
 * Raw yuv or Bayer RGB data from a decoder. CCDC has several modules
 * such as Defect Pixel Correction, Color Space Conversion etc to
 * pre-process the Raw Bayer RGB data, before writing it to SDRAM. This
 * module also allows application to configure individual
 * module parameters through VPFE_CMD_S_CCDC_RAW_PARAMS IOCTL.
 * To do so, application includes dm644x_ccdc.h and vpfe_capture.h header
 * files.  The setparams() API is called by vpfe_capture driver
 * to configure module parameters. This file is named DM644x so that other
 * variants such DM6443 may be supported using the same module.
 *
 * TODO: Test Raw bayer parameter settings and bayer capture
 * 	 Split module parameter structure to module specific ioctl structs
 * 	 investigate if enum used for user space type definition
 * 	 to be replaced by #defines or integer
 */
#include <linux/platform_device.h>
#include <linux/uaccess.h>
#include <linux/videodev2.h>
#include <linux/gfp.h>
#include <linux/clk.h>
#include <linux/err.h>

#include <media/davinci/dm644x_ccdc.h>
#include <media/davinci/vpss.h>

#include "dm644x_ccdc_regs.h"
#include "ccdc_hw_device.h"

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CCDC Driver for DM6446");
MODULE_AUTHOR("Texas Instruments");

static struct ccdc_oper_config {
	struct device *dev;
	/* CCDC interface type */
	enum vpfe_hw_if_type if_type;
	/* Raw Bayer configuration */
	struct ccdc_params_raw bayer;
	/* YCbCr configuration */
	struct ccdc_params_ycbcr ycbcr;
	/* Master clock */
	struct clk *mclk;
	/* slave clock */
	struct clk *sclk;
	/* ccdc base address */
	void __iomem *base_addr;
} ccdc_cfg = {
	/* Raw configurations */
	.bayer = {
		.pix_fmt = CCDC_PIXFMT_RAW,
		.frm_fmt = CCDC_FRMFMT_PROGRESSIVE,
		.win = CCDC_WIN_VGA,
		.fid_pol = VPFE_PINPOL_POSITIVE,
		.vd_pol = VPFE_PINPOL_POSITIVE,
		.hd_pol = VPFE_PINPOL_POSITIVE,
		.config_params = {
			.data_sz = CCDC_DATA_10BITS,
		},
	},
	.ycbcr = {
		.pix_fmt = CCDC_PIXFMT_YCBCR_8BIT,
		.frm_fmt = CCDC_FRMFMT_INTERLACED,
		.win = CCDC_WIN_PAL,
		.fid_pol = VPFE_PINPOL_POSITIVE,
		.vd_pol = VPFE_PINPOL_POSITIVE,
		.hd_pol = VPFE_PINPOL_POSITIVE,
		.bt656_enable = 1,
		.pix_order = CCDC_PIXORDER_CBYCRY,
		.buf_type = CCDC_BUFTYPE_FLD_INTERLEAVED
	},
};

#define CCDC_MAX_RAW_YUV_FORMATS	2

/* Raw Bayer formats */
static u32 ccdc_raw_bayer_pix_formats[] =
	{V4L2_PIX_FMT_SBGGR8, V4L2_PIX_FMT_SBGGR16};

/* Raw YUV formats */
static u32 ccdc_raw_yuv_pix_formats[] =
	{V4L2_PIX_FMT_UYVY, V4L2_PIX_FMT_YUYV};

/* CCDC Save/Restore context */
static u32 ccdc_ctx[CCDC_REG_END / sizeof(u32)];

/* register access routines */
static inline u32 regr(u32 offset)
{
	return __raw_readl(ccdc_cfg.base_addr + offset);
}

static inline void regw(u32 val, u32 offset)
{
	__raw_writel(val, ccdc_cfg.base_addr + offset);
}

static void ccdc_enable(int flag)
{
	regw(flag, CCDC_PCR);
}

static void ccdc_enable_vport(int flag)
{
	if (flag)
		/* enable video port */
		regw(CCDC_ENABLE_VIDEO_PORT, CCDC_FMTCFG);
	else
		regw(CCDC_DISABLE_VIDEO_PORT, CCDC_FMTCFG);
}

/*
 * ccdc_setwin()
 * This function will configure the window size
 * to be capture in CCDC reg
 */
void ccdc_setwin(struct v4l2_rect *image_win,
		enum ccdc_frmfmt frm_fmt,
		int ppc)
{
	int horz_start, horz_nr_pixels;
	int vert_start, vert_nr_lines;
	int val = 0, mid_img = 0;

	dev_dbg(ccdc_cfg.dev, "\nStarting ccdc_setwin...");
	/*
	 * ppc - per pixel count. indicates how many pixels per cell
	 * output to SDRAM. example, for ycbcr, it is one y and one c, so 2.
	 * raw capture this is 1
	 */
	horz_start = image_win->left << (ppc - 1);
	horz_nr_pixels = (image_win->width << (ppc - 1)) - 1;
	regw((horz_start << CCDC_HORZ_INFO_SPH_SHIFT) | horz_nr_pixels,
	     CCDC_HORZ_INFO);

	vert_start = image_win->top;