path: root/drivers/media/video/mx3_camera.c

/*
 * V4L2 Driver for i.MX3x camera host
 *
 * Copyright (C) 2008
 * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/videodev2.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/vmalloc.h>
#include <linux/interrupt.h>

#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/videobuf-dma-contig.h>
#include <media/soc_camera.h>

#include <mach/ipu.h>
#include <mach/mx3_camera.h>

#define MX3_CAM_DRV_NAME "mx3-camera"

/* CMOS Sensor Interface Registers */
#define CSI_REG_START		0x60

#define CSI_SENS_CONF		(0x60 - CSI_REG_START)
#define CSI_SENS_FRM_SIZE	(0x64 - CSI_REG_START)
#define CSI_ACT_FRM_SIZE	(0x68 - CSI_REG_START)
#define CSI_OUT_FRM_CTRL	(0x6C - CSI_REG_START)
#define CSI_TST_CTRL		(0x70 - CSI_REG_START)
#define CSI_CCIR_CODE_1		(0x74 - CSI_REG_START)
#define CSI_CCIR_CODE_2		(0x78 - CSI_REG_START)
#define CSI_CCIR_CODE_3		(0x7C - CSI_REG_START)
#define CSI_FLASH_STROBE_1	(0x80 - CSI_REG_START)
#define CSI_FLASH_STROBE_2	(0x84 - CSI_REG_START)

#define CSI_SENS_CONF_VSYNC_POL_SHIFT		0
#define CSI_SENS_CONF_HSYNC_POL_SHIFT		1
#define CSI_SENS_CONF_DATA_POL_SHIFT		2
#define CSI_SENS_CONF_PIX_CLK_POL_SHIFT		3
#define CSI_SENS_CONF_SENS_PRTCL_SHIFT		4
#define CSI_SENS_CONF_SENS_CLKSRC_SHIFT		7
#define CSI_SENS_CONF_DATA_FMT_SHIFT		8
#define CSI_SENS_CONF_DATA_WIDTH_SHIFT		10
#define CSI_SENS_CONF_EXT_VSYNC_SHIFT		15
#define CSI_SENS_CONF_DIVRATIO_SHIFT		16

#define CSI_SENS_CONF_DATA_FMT_RGB_YUV444	(0UL << CSI_SENS_CONF_DATA_FMT_SHIFT)
#define CSI_SENS_CONF_DATA_FMT_YUV422		(2UL << CSI_SENS_CONF_DATA_FMT_SHIFT)
#define CSI_SENS_CONF_DATA_FMT_BAYER		(3UL << CSI_SENS_CONF_DATA_FMT_SHIFT)

#define MAX_VIDEO_MEM 16

struct mx3_camera_buffer {
	/* common v4l buffer stuff -- must be first */
	struct videobuf_buffer			vb;
	const struct soc_camera_data_format	*fmt;

	/* One descriptot per scatterlist (per frame) */
	struct dma_async_tx_descriptor		*txd;

	/* We have to "build" a scatterlist ourselves - one element per frame */
	struct scatterlist			sg;
};

/**
 * struct mx3_camera_dev - i.MX3x camera (CSI) object
 * @dev:		camera device, to which the coherent buffer is attached
 * @icd:		currently attached camera sensor
 * @clk:		pointer to clock
 * @base:		remapped register base address
 * @pdata:		platform data
 * @platform_flags:	platform flags
 * @mclk:		master clock frequency in Hz
 * @capture:		list of capture videobuffers
 * @lock:		protects video buffer lists
 * @active:		active video buffer
 * @idmac_channel:	array of pointers to IPU DMAC DMA channels
 * @soc_host:		embedded soc_host object
 */
struct mx3_camera_dev {
	/*
	 * i.MX3x is only supposed to handle one camera on its Camera Sensor
	 * Interface. If anyone ever builds hardware to enable more than one
	 * camera _simultaneously_, they will have to modify this driver too
	 */
	struct soc_camera_device *icd;
	struct clk		*clk;

	void __iomem		*base;

	struct mx3_camera_pdata	*pdata;

	unsigned long		platform_flags;
	unsigned long		mclk;

	struct list_head	capture;
	spinlock_t		lock;		/* Protects video buffer lists */
	struct mx3_camera_buffer *active;

	/* IDMAC / dmaengine interface */
	struct idmac_channel	*idmac_channel[1];	/* We need one channel */

	struct soc_camera_host	soc_host;
};

struct dma_chan_request {
	struct mx3_camera_dev	*mx3_cam;
	enum ipu_channel	id;
};

static int mx3_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt);

static u32 csi_reg_read(struct mx3_camera_dev *mx3, off_t reg)
{
	return __raw_readl(mx3->base + reg);
}

static void csi_reg_write(struct mx3_camera_dev *mx3, u32 value, off_t reg)
{
	__raw_writel(value, mx3->base + reg);
}

/* Called from the IPU IDMAC ISR */
static void mx3_cam_dma_done(void *arg)
{
	struct idmac_tx_desc *desc = to_tx_desc(arg);
	struct dma_chan *chan = desc->txd.chan;
	struct idmac_channel *ichannel = to_idmac_chan(chan);
	struct mx3_camera_dev *mx3_cam = ichannel->client;
	struct videobuf_buffer *vb;

	dev_dbg(chan->device->dev, "callback cookie %d, active DMA 0x%08x