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

/*
 * V4L2 Driver for PXA camera host
 *
 * Copyright (C) 2006, Sascha Hauer, Pengutronix
 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
 *
 * 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.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/time.h>
#include <linux/version.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/clk.h>

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

#include <linux/videodev2.h>

#include <asm/dma.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/camera.h>

#define PXA_CAM_VERSION_CODE KERNEL_VERSION(0, 0, 5)
#define PXA_CAM_DRV_NAME "pxa27x-camera"

#define CICR0_SIM_MP	(0 << 24)
#define CICR0_SIM_SP	(1 << 24)
#define CICR0_SIM_MS	(2 << 24)
#define CICR0_SIM_EP	(3 << 24)
#define CICR0_SIM_ES	(4 << 24)

#define CICR1_DW_VAL(x)   ((x) & CICR1_DW)	    /* Data bus width */
#define CICR1_PPL_VAL(x)  (((x) << 15) & CICR1_PPL) /* Pixels per line */
#define CICR1_COLOR_SP_VAL(x)	(((x) << 3) & CICR1_COLOR_SP)	/* color space */
#define CICR1_RGB_BPP_VAL(x)	(((x) << 7) & CICR1_RGB_BPP)	/* bpp for rgb */
#define CICR1_RGBT_CONV_VAL(x)	(((x) << 29) & CICR1_RGBT_CONV)	/* rgbt conv */

#define CICR2_BLW_VAL(x)  (((x) << 24) & CICR2_BLW) /* Beginning-of-line pixel clock wait count */
#define CICR2_ELW_VAL(x)  (((x) << 16) & CICR2_ELW) /* End-of-line pixel clock wait count */
#define CICR2_HSW_VAL(x)  (((x) << 10) & CICR2_HSW) /* Horizontal sync pulse width */
#define CICR2_BFPW_VAL(x) (((x) << 3) & CICR2_BFPW) /* Beginning-of-frame pixel clock wait count */
#define CICR2_FSW_VAL(x)  (((x) << 0) & CICR2_FSW)  /* Frame stabilization wait count */

#define CICR3_BFW_VAL(x)  (((x) << 24) & CICR3_BFW) /* Beginning-of-frame line clock wait count  */
#define CICR3_EFW_VAL(x)  (((x) << 16) & CICR3_EFW) /* End-of-frame line clock wait count */
#define CICR3_VSW_VAL(x)  (((x) << 11) & CICR3_VSW) /* Vertical sync pulse width */
#define CICR3_LPF_VAL(x)  (((x) << 0) & CICR3_LPF)  /* Lines per frame */

#define CICR0_IRQ_MASK (CICR0_TOM | CICR0_RDAVM | CICR0_FEM | CICR0_EOLM | \
			CICR0_PERRM | CICR0_QDM | CICR0_CDM | CICR0_SOFM | \
			CICR0_EOFM | CICR0_FOM)

static DEFINE_MUTEX(camera_lock);

/*
 * Structures
 */
enum pxa_camera_active_dma {
	DMA_Y = 0x1,
	DMA_U = 0x2,
	DMA_V = 0x4,
};

/* descriptor needed for the PXA DMA engine */
struct pxa_cam_dma {
	dma_addr_t		sg_dma;
	struct pxa_dma_desc	*sg_cpu;
	size_t			sg_size;
	int			sglen;
};

/* buffer for one video frame */
struct pxa_buffer {
	/* common v4l buffer stuff -- must be first */
	struct videobuf_buffer vb;

	const struct soc_camera_data_format        *fmt;

	/* our descriptor lists for Y, U and V channels */
	struct pxa_cam_dma dmas[3];

	int			inwork;

	enum pxa_camera_active_dma active_dma;
};

struct pxa_camera_dev {
	struct device		*dev;
	/* PXA27x is only supposed to handle one camera on its Quick Capture
	 * interface. If anyone ever builds hardware to enable more than
	 * one camera, they will have to modify this driver too */
	struct soc_camera_device *icd;
	struct clk		*clk;

	unsigned int		irq;
	void __iomem		*base;

	int			channels;
	unsigned int		dma_chans[3];

	struct pxacamera_platform_data *pdata;
	struct resource		*res;
	unsigned long		platform_flags;
	unsigned long		platform_mclk_10khz;

	struct list_head	capture;

	spinlock_t		lock;

	struct pxa_buffer	*active;
	struct pxa_dma_desc	*sg_tail[3];
};

static const char *pxa_cam_driver_description = "PXA_Camera";

static unsigned int vid_limit = 16;	/* Video memory limit, in Mb */

/*
 *  Videobuf operations
 */
static int pxa_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
			      unsigned int *size)
{
	struct soc_camera_device *icd = vq->priv_data;
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.