Re: [RFC PATCH V2] Add camera (CSI) driver for MX1

[Darius Augulis <augulis.darius@gmail.com>]

Changelog since V1:

- Licensing fixed (GPL V2)
- Includes sorted
- Code indentation fixed
- Fixed errors listed by checkpatch
- Most of Guennadi comments fixed
- Spinlocks removed
- .power and .reset removed from pdata
- Redundant test "if (!(common_flags & SOCAM_DATAWIDTH_8))" removed
- Setup bus parameters in imx_camera_set_bus_param() based on pdata choice
- .set_crop method added
- Driver based on newest v4l-dvb tree
- Suspend and resume moved to soc_camera_host_ops
- Driver dependencies fixed
- Driver renamed to mx1_camera
- My signed-off line added


Notes:

- Buffer count unfixed (if (!*count) *count = 32;). Don't know how to fix correctly.
- Suspend and resume are almost redundant. Maybe remove them at all?
- Several WARN_ON warning still here, not sure about removing them.


Waiting for further comments and recommendations.



Darius Augulis wrote:
> From: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
> 
> Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
> ---
> 
>  arch/arm/mach-mx1/Makefile                  |    7 
>  arch/arm/mach-mx1/ksym_mx1.c                |   20 +
>  arch/arm/mach-mx1/mx1_camera_fiq.S          |   35 +
>  arch/arm/plat-mxc/include/mach/memory.h     |    8 
>  arch/arm/plat-mxc/include/mach/mx1_camera.h |   39 +
>  drivers/media/video/Kconfig                 |    9 
>  drivers/media/video/Makefile                |    1 
>  drivers/media/video/mx1_camera.c            |  838 +++++++++++++++++++++++++++
>  8 files changed, 955 insertions(+), 2 deletions(-)
>  create mode 100644 arch/arm/mach-mx1/ksym_mx1.c
>  create mode 100644 arch/arm/mach-mx1/mx1_camera_fiq.S
>  create mode 100644 arch/arm/plat-mxc/include/mach/mx1_camera.h
>  create mode 100644 drivers/media/video/mx1_camera.c
> 
> 
> diff --git a/arch/arm/mach-mx1/Makefile b/arch/arm/mach-mx1/Makefile
> index b969719..4fbdbbd 100644
> --- a/arch/arm/mach-mx1/Makefile
> +++ b/arch/arm/mach-mx1/Makefile
> @@ -4,7 +4,12 @@
>  
>  # Object file lists.
>  
> -obj-y			+= generic.o clock.o devices.o
> +obj-y			+= generic.o clock.o devices.o ksym_mx1.o
> +
> +# Support for CMOS sensor interface
> +ifdef CONFIG_VIDEO_MX1
> +obj-y	+= mx1_camera_fiq.o
> +endif
>  
>  # Specific board support
>  obj-$(CONFIG_ARCH_MX1ADS) += mx1ads.o
> diff --git a/arch/arm/mach-mx1/ksym_mx1.c b/arch/arm/mach-mx1/ksym_mx1.c
> new file mode 100644
> index 0000000..d771b2c
> --- /dev/null
> +++ b/arch/arm/mach-mx1/ksym_mx1.c
> @@ -0,0 +1,20 @@
> +/*
> + * Exported ksyms of ARCH_MX1
> + *
> + * Copyright (C) 2008, Darius Augulis <augulis.darius@gmail.com>
> + *
> + * 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/platform_device.h>
> +#include <linux/module.h>
> +
> +#if defined(CONFIG_VIDEO_MX1) || defined(CONFIG_VIDEO_MX1_MODULE)
> +#include <mach/mx1_camera.h>
> +
> +/* IMX camera FIQ handler */
> +EXPORT_SYMBOL(mx1_camera_sof_fiq_start);
> +EXPORT_SYMBOL(mx1_camera_sof_fiq_end);
> +#endif
> diff --git a/arch/arm/mach-mx1/mx1_camera_fiq.S b/arch/arm/mach-mx1/mx1_camera_fiq.S
> new file mode 100644
> index 0000000..9c69aa6
> --- /dev/null
> +++ b/arch/arm/mach-mx1/mx1_camera_fiq.S
> @@ -0,0 +1,35 @@
> +/*
> + *  Copyright (C) 2008 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
> + *
> + *  Based on linux/arch/arm/lib/floppydma.S
> + *      Copyright (C) 1995, 1996 Russell King
> + *
> + * 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/linkage.h>
> +#include <asm/assembler.h>
> +
> +		.text
> +		.global	mx1_camera_sof_fiq_end
> +		.global	mx1_camera_sof_fiq_start
> +mx1_camera_sof_fiq_start:
> +		@ enable dma
> +		ldr	r12, [r9]
> +		orr	r12, r12, #0x00000001
> +		str	r12, [r9]
> +		@ unmask DMA interrupt
> +		ldr	r12, [r8]
> +		bic	r12, r12, r13
> +		str	r12, [r8]
> +		@ disable SOF interrupt
> +		ldr	r12, [r10]
> +		bic	r12, r12, #0x00010000
> +		str	r12, [r10]
> +		@ clear SOF flag
> +		mov	r12, #0x00010000
> +		str	r12, [r11]
> +		@ return from FIQ
> +		subs	pc, lr, #4
> +mx1_camera_sof_fiq_end:
> diff --git a/arch/arm/plat-mxc/include/mach/memory.h b/arch/arm/plat-mxc/include/mach/memory.h
> index 0b80839..c6f2170 100644
> --- a/arch/arm/plat-mxc/include/mach/memory.h
> +++ b/arch/arm/plat-mxc/include/mach/memory.h
> @@ -19,4 +19,12 @@
>  #define PHYS_OFFSET		UL(0x80000000)
>  #endif
>  
> +#if defined(CONFIG_VIDEO_MX1) || defined(CONFIG_VIDEO_MX1_MODULE)
> +/*
> + * Increase size of DMA-consistent memory region.
> + * This is required for i.MX camera driver to capture at least four VGA frames.
> + */
> +#define CONSISTENT_DMA_SIZE SZ_8M
> +#endif /* CONFIG_VIDEO_MX1 */
> +
>  #endif /* __ASM_ARCH_MXC_MEMORY_H__ */
> diff --git a/arch/arm/plat-mxc/include/mach/mx1_camera.h b/arch/arm/plat-mxc/include/mach/mx1_camera.h
> new file mode 100644
> index 0000000..1bf03e8
> --- /dev/null
> +++ b/arch/arm/plat-mxc/include/mach/mx1_camera.h
> @@ -0,0 +1,39 @@
> +/*
> + * mx1_camera.h - i.MX1/i.MXL camera driver header file
> + *
> + * Copyright (c) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
> + * Copyright (C) 2009, Darius Augulis <augulis.darius@gmail.com>
> + *
> + * Based on PXA camera.h file:
> + * Copyright (C) 2003, Intel Corporation
> + * 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 version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef __ASM_ARCH_CAMERA_H_
> +#define __ASM_ARCH_CAMERA_H_
> +
> +#define MX1_CAMERA_DP		1
> +#define MX1_CAMERA_PCP		2
> +#define MX1_CAMERA_VSP		4
> +
> +extern unsigned char mx1_camera_sof_fiq_start, mx1_camera_sof_fiq_end;
> +
> +/**
> + * struct mx1_camera_pdata - i.MX1/i.MXL camera platform data
> + * @init:	Init board resources
> + * @exit:	Release board resources
> + * @mclk_10khz:	master clock frequency in 10kHz units
> + * @flags:	MX1 camera platform flags
> + */
> +struct mx1_camera_pdata {
> +	int (*init)(struct device *);
> +	int (*exit)(struct device *);
> +	unsigned long mclk_10khz;
> +	unsigned long flags;
> +};
> +
> +#endif /* __ASM_ARCH_CAMERA_H_ */
> diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
> index 58abbe3..e5eeb4a 100644
> --- a/drivers/media/video/Kconfig
> +++ b/drivers/media/video/Kconfig
> @@ -746,6 +746,14 @@ config SOC_CAMERA_OV772X
>  	help
>  	  This is a ov772x camera driver
>  
> +config VIDEO_MX1
> +	tristate "i.MX1/i.MXL CMOS Sensor Interface driver"
> +	depends on VIDEO_DEV && ARCH_MX1 && SOC_CAMERA
> +	select FIQ
> +	select VIDEOBUF_DMA_CONTIG
> +	---help---
> +	  This is a v4l2 driver for the i.MX1/i.MXL CMOS Sensor Interface
> +
>  config VIDEO_MX3
>  	tristate "i.MX3x Camera Sensor Interface driver"
>  	depends on VIDEO_DEV && MX3_IPU && SOC_CAMERA
> @@ -906,5 +914,4 @@ config USB_S2255
>  	  This driver can be compiled as a module, called s2255drv.
>  
>  endif # V4L_USB_DRIVERS
> -
>  endif # VIDEO_CAPTURE_DRIVERS
> diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
> index 08765d8..7c0bd6e 100644
> --- a/drivers/media/video/Makefile
> +++ b/drivers/media/video/Makefile
> @@ -134,6 +134,7 @@ obj-$(CONFIG_VIDEO_CX18) += cx18/
>  obj-$(CONFIG_VIDEO_VIVI) += vivi.o
>  obj-$(CONFIG_VIDEO_CX23885) += cx23885/
>  
> +obj-$(CONFIG_VIDEO_MX1)			+= mx1_camera.o
>  obj-$(CONFIG_VIDEO_MX3)			+= mx3_camera.o
>  obj-$(CONFIG_VIDEO_PXA27x)		+= pxa_camera.o
>  obj-$(CONFIG_VIDEO_SH_MOBILE_CEU)	+= sh_mobile_ceu_camera.o
> diff --git a/drivers/media/video/mx1_camera.c b/drivers/media/video/mx1_camera.c
> new file mode 100644
> index 0000000..86f8d89
> --- /dev/null
> +++ b/drivers/media/video/mx1_camera.c
> @@ -0,0 +1,838 @@
> +/*
> + * V4L2 Driver for i.MXL/i.MXL camera (CSI) host
> + *
> + * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
> + * Copyright (C) 2009, Darius Augulis <augulis.darius@gmail.com>
> + *
> + * Based on PXA SoC camera driver
> + * 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 version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/errno.h>
> +#include <linux/fs.h>
> +#include <linux/kernel.h>
> +#include <linux/mm.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/time.h>
> +#include <linux/version.h>
> +#include <linux/videodev2.h>
> +
> +#include <media/soc_camera.h>
> +#include <media/v4l2-common.h>
> +#include <media/v4l2-dev.h>
> +#include <media/videobuf-dma-contig.h>
> +
> +#include <asm/dma.h>
> +#include <asm/fiq.h>
> +#include <mach/dma-mx1-mx2.h>
> +#include <mach/hardware.h>
> +#include <mach/mx1_camera.h>
> +
> +/*
> + * CSI registers
> + */
> +#define DMA_CCR(x)	(0x8c + ((x) << 6))	/* Control Registers */
> +#define DMA_DIMR	0x08			/* Interrupt mask Register */
> +#define CSICR1		0x00			/* CSI Control Register 1 */
> +#define CSISR		0x08			/* CSI Status Register */
> +#define CSIRXR		0x10			/* CSI RxFIFO Register */
> +
> +#define CSICR1_RXFF_LEVEL(x)	(((x) & 0x3) << 19)
> +#define CSICR1_SOF_POL		(1 << 17)
> +#define CSICR1_SOF_INTEN	(1 << 16)
> +#define CSICR1_MCLKDIV(x)	(((x) & 0xf) << 12)
> +#define CSICR1_MCLKEN		(1 << 9)
> +#define CSICR1_FCC		(1 << 8)
> +#define CSICR1_BIG_ENDIAN	(1 << 7)
> +#define CSICR1_CLR_RXFIFO	(1 << 5)
> +#define CSICR1_GCLK_MODE	(1 << 4)
> +#define CSICR1_DATA_POL		(1 << 2)
> +#define CSICR1_REDGE		(1 << 1)
> +#define CSICR1_EN		(1 << 0)
> +
> +#define CSISR_SFF_OR_INT	(1 << 25)
> +#define CSISR_RFF_OR_INT	(1 << 24)
> +#define CSISR_STATFF_INT	(1 << 21)
> +#define CSISR_RXFF_INT		(1 << 18)
> +#define CSISR_SOF_INT		(1 << 16)
> +#define CSISR_DRDY		(1 << 0)
> +
> +#define VERSION_CODE KERNEL_VERSION(0, 0, 1)
> +#define DRIVER_NAME "mx1-camera"
> +
> +#define CSI_IRQ_MASK	(CSISR_SFF_OR_INT | CSISR_RFF_OR_INT | \
> +			CSISR_STATFF_INT | CSISR_RXFF_INT | CSISR_SOF_INT)
> +
> +#define CSI_BUS_FLAGS	(SOCAM_MASTER | SOCAM_HSYNC_ACTIVE_HIGH | \
> +			SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW | \
> +			SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING | \
> +			SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW | \
> +			SOCAM_DATAWIDTH_8)
> +
> +/*
> + * Structures
> + */
> +
> +/* buffer for one video frame */
> +struct mx1_buffer {
> +	/* common v4l buffer stuff -- must be first */
> +	struct videobuf_buffer vb;
> +	const struct soc_camera_data_format *fmt;
> +	int inwork;
> +};
> +
> +/* i.MX is only supposed to handle one camera on its Camera Sensor
> + * Interface. If anyone ever builds hardware to enable more than
> + * one camera, they will have to modify this driver too */
> +struct mx1_camera_dev {
> +	struct soc_camera_device	*icd;
> +	struct mx1_camera_pdata		*pdata;
> +	struct mx1_buffer		*active;
> +	struct device			*dev;
> +	struct resource			*res;
> +	struct clk			*clk;
> +	struct list_head		capture;
> +
> +	void __iomem			*base;
> +	int				dma_chan;
> +	unsigned int			irq;
> +	unsigned long			mclk;
> +
> +	spinlock_t			lock;
> +};
> +
> +/*
> + *  Videobuf operations
> + */
> +static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
> +			      unsigned int *size)
> +{
> +	struct soc_camera_device *icd = vq->priv_data;
> +
> +	*size = icd->width * icd->height *
> +		((icd->current_fmt->depth + 7) >> 3);
> +
> +	if (!*count)
> +		*count = 32;
> +
> +	dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);
> +
> +	return 0;
> +}
> +
> +static void free_buffer(struct videobuf_queue *vq, struct mx1_buffer *buf)
> +{
> +	struct soc_camera_device *icd = vq->priv_data;
> +	struct videobuf_buffer *vb = &buf->vb;
> +
> +	BUG_ON(in_interrupt());
> +
> +	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> +		vb, buf->vb.baddr, buf->vb.bsize);
> +
> +	/* This waits until this buffer is out of danger, i.e., until it is no
> +	 * longer in STATE_QUEUED or STATE_ACTIVE */
> +	videobuf_waiton(vb, 0, 0);
> +	videobuf_dma_contig_free(vq, vb);
> +
> +	buf->vb.state = VIDEOBUF_NEEDS_INIT;
> +}
> +
> +static int mx1_videobuf_prepare(struct videobuf_queue *vq,
> +		struct videobuf_buffer *vb, enum v4l2_field field)
> +{
> +	struct soc_camera_device *icd = vq->priv_data;
> +	struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
> +	int ret;
> +
> +	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> +		vb, vb->baddr, vb->bsize);
> +
> +	/* Added list head initialization on alloc */
> +	WARN_ON(!list_empty(&vb->queue));
> +
> +	BUG_ON(NULL == icd->current_fmt);
> +
> +	/* I think, in buf_prepare you only have to protect global data,
> +	 * the actual buffer is yours */
> +	buf->inwork = 1;
> +
> +	if	(buf->fmt	!= icd->current_fmt ||
> +		vb->width	!= icd->width ||
> +		vb->height	!= icd->height ||
> +		vb->field	!= field) {
> +			buf->fmt	= icd->current_fmt;
> +			vb->width	= icd->width;
> +			vb->height	= icd->height;
> +			vb->field	= field;
> +			vb->state	= VIDEOBUF_NEEDS_INIT;
> +	}
> +
> +	vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
> +	if (0 != vb->baddr && vb->bsize < vb->size) {
> +		ret = -EINVAL;
> +		goto out;
> +	}
> +
> +	if (vb->state == VIDEOBUF_NEEDS_INIT) {
> +		ret = videobuf_iolock(vq, vb, NULL);
> +		if (ret)
> +			goto fail;
> +
> +		vb->state = VIDEOBUF_PREPARED;
> +	}
> +
> +	buf->inwork = 0;
> +
> +	return 0;
> +
> +fail:
> +	free_buffer(vq, buf);
> +out:
> +	buf->inwork = 0;
> +	return ret;
> +}
> +
> +static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev)
> +{
> +	struct videobuf_buffer *vbuf = &pcdev->active->vb;
> +	int ret;
> +
> +	if (unlikely(!pcdev->active)) {
> +		dev_err(pcdev->dev, "DMA End IRQ with no active buffer\n");
> +		return -EFAULT;
> +	}
> +
> +	/* setup sg list for future DMA */
> +	ret = imx_dma_setup_single(pcdev->dma_chan,
> +		videobuf_to_dma_contig(vbuf),
> +		vbuf->size, pcdev->res->start +
> +		CSIRXR, DMA_MODE_READ);
> +	if (unlikely(ret))
> +		dev_err(pcdev->dev, "Failed to setup DMA sg list\n");
> +
> +	return ret;
> +}
> +
> +static void mx1_videobuf_queue(struct videobuf_queue *vq,
> +						struct videobuf_buffer *vb)
> +{
> +	struct soc_camera_device *icd = vq->priv_data;
> +	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> +	struct mx1_camera_dev *pcdev = ici->priv;
> +	struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
> +
> +	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> +		vb, vb->baddr, vb->bsize);
> +
> +	list_add_tail(&vb->queue, &pcdev->capture);
> +
> +	vb->state = VIDEOBUF_ACTIVE;
> +
> +	if (!pcdev->active) {
> +		pcdev->active = buf;
> +
> +		/* setup sg list for future DMA */
> +		if (!mx1_camera_setup_dma(pcdev)) {
> +			unsigned int temp;
> +			/* enable SOF irq */
> +			temp = __raw_readl(pcdev->base + CSICR1) |
> +							CSICR1_SOF_INTEN;
> +			__raw_writel(temp, pcdev->base + CSICR1);
> +		}
> +	}
> +}
> +
> +static void mx1_videobuf_release(struct videobuf_queue *vq,
> +				 struct videobuf_buffer *vb)
> +{
> +	struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
> +#ifdef DEBUG
> +	struct soc_camera_device *icd = vq->priv_data;
> +
> +	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> +		vb, vb->baddr, vb->bsize);
> +
> +	switch (vb->state) {
> +	case VIDEOBUF_ACTIVE:
> +		dev_dbg(&icd->dev, "%s (active)\n", __func__);
> +		break;
> +	case VIDEOBUF_QUEUED:
> +		dev_dbg(&icd->dev, "%s (queued)\n", __func__);
> +		break;
> +	case VIDEOBUF_PREPARED:
> +		dev_dbg(&icd->dev, "%s (prepared)\n", __func__);
> +		break;
> +	default:
> +		dev_dbg(&icd->dev, "%s (unknown)\n", __func__);
> +		break;
> +	}
> +#endif
> +
> +	free_buffer(vq, buf);
> +}
> +
> +static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
> +			      struct videobuf_buffer *vb,
> +			      struct mx1_buffer *buf)
> +{
> +	/* _init is used to debug races, see comment in mx1_camera_reqbufs() */
> +	list_del_init(&vb->queue);
> +	vb->state = VIDEOBUF_DONE;
> +	do_gettimeofday(&vb->ts);
> +	vb->field_count++;
> +	wake_up(&vb->done);
> +
> +	if (list_empty(&pcdev->capture)) {
> +		pcdev->active = NULL;
> +		return;
> +	}
> +
> +	pcdev->active = list_entry(pcdev->capture.next,
> +				   struct mx1_buffer, vb.queue);
> +
> +	/* setup sg list for future DMA */
> +	if (likely(!mx1_camera_setup_dma(pcdev))) {
> +		unsigned int temp;
> +
> +		/* enable SOF irq */
> +		temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
> +		__raw_writel(temp, pcdev->base + CSICR1);
> +	}
> +}
> +
> +static void mx1_camera_dma_irq(int channel, void *data)
> +{
> +	struct mx1_camera_dev *pcdev = data;
> +	struct mx1_buffer *buf;
> +	struct videobuf_buffer *vb;
> +
> +	imx_dma_disable(channel);
> +
> +	if (unlikely(!pcdev->active)) {
> +		dev_err(pcdev->dev, "DMA End IRQ with no active buffer\n");
> +		return;
> +	}
> +
> +	vb = &pcdev->active->vb;
> +	buf = container_of(vb, struct mx1_buffer, vb);
> +	WARN_ON(buf->inwork || list_empty(&vb->queue));
> +	dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> +		vb, vb->baddr, vb->bsize);
> +
> +	mx1_camera_wakeup(pcdev, vb, buf);
> +}
> +
> +static struct videobuf_queue_ops mx1_videobuf_ops = {
> +	.buf_setup	= mx1_videobuf_setup,
> +	.buf_prepare	= mx1_videobuf_prepare,
> +	.buf_queue	= mx1_videobuf_queue,
> +	.buf_release	= mx1_videobuf_release,
> +};
> +
> +static void mx1_camera_init_videobuf(struct videobuf_queue *q,
> +				     struct soc_camera_device *icd)
> +{
> +	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> +	struct mx1_camera_dev *pcdev = ici->priv;
> +
> +	videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, pcdev->dev,
> +					&pcdev->lock,
> +					V4L2_BUF_TYPE_VIDEO_CAPTURE,
> +					V4L2_FIELD_NONE,
> +					sizeof(struct mx1_buffer), icd);
> +}
> +
> +static int mclk_get_divisor(struct mx1_camera_dev *pcdev)
> +{
> +	unsigned int mclk = pcdev->mclk;
> +	unsigned long div;
> +	unsigned long lcdclk;
> +
> +	lcdclk = clk_get_rate(pcdev->clk);
> +
> +	/* We verify platform_mclk_10khz != 0, so if anyone breaks it, here
> +	 * they get a nice Oops */
> +	div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
> +
> +	dev_dbg(pcdev->dev, "System clock %lukHz, target freq %dkHz, "
> +		"divisor %lu\n", lcdclk / 1000, mclk / 1000, div);
> +
> +	return div;
> +}
> +
> +static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
> +{
> +	struct mx1_camera_pdata *pdata = pcdev->pdata;
> +	unsigned int csicr1 = CSICR1_EN;
> +
> +	dev_dbg(pcdev->dev, "Registered platform device at %p\n",
> +		pcdev);
> +
> +	if (pdata && pdata->init) {
> +		dev_dbg(pcdev->dev, "%s: Init gpios\n", __func__);
> +		pdata->init(pcdev->dev);
> +	}
> +
> +	clk_enable(pcdev->clk);
> +
> +	/* enable CSI before doing anything else */
> +	__raw_writel(csicr1, pcdev->base + CSICR1);
> +
> +	csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
> +	csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
> +	csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
> +
> +	__raw_writel(csicr1, pcdev->base + CSICR1);
> +}
> +
> +static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
> +{
> +	struct mx1_camera_pdata *board = pcdev->pdata;
> +
> +	/* Disable all CSI interface */
> +	__raw_writel(0x00, pcdev->base + CSICR1);
> +
> +	clk_disable(pcdev->clk);
> +
> +	if (board && board->exit) {
> +		dev_dbg(pcdev->dev, "%s: Release gpios\n", __func__);
> +		board->exit(pcdev->dev);
> +	}
> +}
> +
> +/* The following two functions absolutely depend on the fact, that
> + * there can be only one camera on i.MX camera sensor interface */
> +static int mx1_camera_add_device(struct soc_camera_device *icd)
> +{
> +	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> +	struct mx1_camera_dev *pcdev = ici->priv;
> +	int ret;
> +
> +	if (pcdev->icd) {
> +		ret = -EBUSY;
> +		goto ebusy;
> +	}
> +
> +	dev_info(&icd->dev, "i.MX Camera driver attached to camera %d\n",
> +		 icd->devnum);
> +
> +	mx1_camera_activate(pcdev);
> +	ret = icd->ops->init(icd);
> +
> +	if (!ret)
> +		pcdev->icd = icd;
> +
> +ebusy:
> +	return ret;
> +}
> +
> +static void mx1_camera_remove_device(struct soc_camera_device *icd)
> +{
> +	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> +	struct mx1_camera_dev *pcdev = ici->priv;
> +	unsigned int csicr1;
> +
> +	BUG_ON(icd != pcdev->icd);
> +
> +	/* disable interrupts */
> +	csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
> +	__raw_writel(csicr1, pcdev->base + CSICR1);
> +
> +	/* Stop DMA engine */
> +	imx_dma_disable(pcdev->dma_chan);
> +
> +	dev_info(&icd->dev, "i.MX Camera driver detached from camera %d\n",
> +		 icd->devnum);
> +
> +	icd->ops->release(icd);
> +
> +	mx1_camera_deactivate(pcdev);
> +
> +	pcdev->icd = NULL;
> +}
> +
> +#ifdef CONFIG_PM
> +static int mx1_camera_suspend(struct soc_camera_device *icd, pm_message_t state)
> +{
> +	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> +	struct mx1_camera_dev *pcdev = ici->priv;
> +
> +	if (pcdev->active)
> +		return -EBUSY;
> +
> +	return 0;
> +}
> +
> +static int mx1_camera_resume(struct soc_camera_device *icd)
> +{
> +	return 0;
> +}
> +#else
> +#define mx1_camera_suspend NULL
> +#define mx1_camera_resume NULL
> +#endif
> +
> +static int mx1_camera_set_crop(struct soc_camera_device *icd,
> +			       struct v4l2_rect *rect)
> +{
> +	return icd->ops->set_crop(icd, rect);
> +}
> +
> +static int mx1_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
> +{
> +	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> +	struct mx1_camera_dev *pcdev = ici->priv;
> +	unsigned long camera_flags, common_flags;
> +	unsigned int csicr1;
> +	int ret;
> +
> +	camera_flags = icd->ops->query_bus_param(icd);
> +
> +	/* MX1 supports only 8bit buswidth */
> +	common_flags = soc_camera_bus_param_compatible(camera_flags,
> +							       CSI_BUS_FLAGS);
> +	if (!common_flags)
> +		return -EINVAL;
> +
> +	icd->buswidth = 8;
> +
> +	/* Make choises, based on platform choice */
> +	if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
> +		(common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
> +			if (pcdev->pdata->flags & MX1_CAMERA_VSP)
> +				common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
> +			else
> +				common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
> +	}
> +
> +	if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
> +		(common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
> +		if (pcdev->pdata->flags & MX1_CAMERA_PCP)
> +			common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
> +		else
> +			common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
> +	}
> +
> +	if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
> +		(common_flags & SOCAM_DATA_ACTIVE_LOW)) {
> +		if (pcdev->pdata->flags & MX1_CAMERA_DP)
> +			common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
> +		else
> +			common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
> +	}
> +
> +	ret = icd->ops->set_bus_param(icd, common_flags);
> +	if (ret < 0)
> +		return ret;
> +
> +	csicr1 = __raw_readl(pcdev->base + CSICR1);
> +
> +	if (common_flags & SOCAM_PCLK_SAMPLE_RISING)
> +		csicr1 |= CSICR1_REDGE;
> +	if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH)
> +		csicr1 |= CSICR1_SOF_POL;
> +	if (common_flags & SOCAM_DATA_ACTIVE_LOW)
> +		csicr1 |= CSICR1_DATA_POL;
> +
> +	__raw_writel(csicr1, pcdev->base + CSICR1);
> +
> +	return 0;
> +}
> +
> +static int mx1_camera_set_fmt(struct soc_camera_device *icd,
> +			      struct v4l2_format *f)
> +{
> +	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> +	const struct soc_camera_format_xlate *xlate;
> +	struct v4l2_pix_format *pix = &f->fmt.pix;
> +	int ret;
> +
> +	xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
> +	if (!xlate) {
> +		dev_warn(&ici->dev, "Format %x not found\n", pix->pixelformat);
> +		return -EINVAL;
> +	}
> +
> +	ret = icd->ops->set_fmt(icd, f);
> +	if (!ret) {
> +		icd->buswidth = xlate->buswidth;
> +		icd->current_fmt = xlate->host_fmt;
> +	}
> +
> +	return ret;
> +}
> +
> +static int mx1_camera_try_fmt(struct soc_camera_device *icd,
> +			      struct v4l2_format *f)
> +{
> +	/* TODO: limit to mx1 hardware capabilities */
> +
> +	/* limit to sensor capabilities */
> +	return icd->ops->try_fmt(icd, f);
> +}
> +
> +static int mx1_camera_reqbufs(struct soc_camera_file *icf,
> +			      struct v4l2_requestbuffers *p)
> +{
> +	int i;
> +
> +	/* This is for locking debugging only. I removed spinlocks and now I
> +	 * check whether .prepare is ever called on a linked buffer, or whether
> +	 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
> +	 * it hadn't triggered */
> +	for (i = 0; i < p->count; i++) {
> +		struct mx1_buffer *buf = container_of(icf->vb_vidq.bufs[i],
> +						      struct mx1_buffer, vb);
> +		buf->inwork = 0;
> +		INIT_LIST_HEAD(&buf->vb.queue);
> +	}
> +
> +	return 0;
> +}
> +
> +static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
> +{
> +	struct soc_camera_file *icf = file->private_data;
> +	struct mx1_buffer *buf;
> +
> +	buf = list_entry(icf->vb_vidq.stream.next, struct mx1_buffer,
> +			 vb.stream);
> +
> +	poll_wait(file, &buf->vb.done, pt);
> +
> +	if (buf->vb.state == VIDEOBUF_DONE ||
> +	    buf->vb.state == VIDEOBUF_ERROR)
> +		return POLLIN | POLLRDNORM;
> +
> +	return 0;
> +}
> +
> +static int mx1_camera_querycap(struct soc_camera_host *ici,
> +			       struct v4l2_capability *cap)
> +{
> +	/* cap->name is set by the friendly caller:-> */
> +	strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
> +	cap->version = VERSION_CODE;
> +	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> +
> +	return 0;
> +}
> +
> +static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
> +	.owner		= THIS_MODULE,
> +	.add		= mx1_camera_add_device,
> +	.remove		= mx1_camera_remove_device,
> +	.suspend	= mx1_camera_suspend,
> +	.resume		= mx1_camera_resume,
> +	.set_bus_param	= mx1_camera_set_bus_param,
> +	.set_crop	= mx1_camera_set_crop,
> +	.set_fmt	= mx1_camera_set_fmt,
> +	.try_fmt	= mx1_camera_try_fmt,
> +	.init_videobuf	= mx1_camera_init_videobuf,
> +	.reqbufs	= mx1_camera_reqbufs,
> +	.poll		= mx1_camera_poll,
> +	.querycap	= mx1_camera_querycap,
> +};
> +
> +/* Should be allocated dynamically too, but we have only one. */
> +static struct soc_camera_host mx1_soc_camera_host = {
> +	.drv_name	= DRIVER_NAME,
> +	.ops		= &mx1_soc_camera_host_ops,
> +};
> +
> +static struct fiq_handler fh = {
> +	.name		= "csi_sof"
> +};
> +
> +static int __init mx1_camera_probe(struct platform_device *pdev)
> +{
> +	struct mx1_camera_dev *pcdev;
> +	struct resource *res;
> +	struct pt_regs regs;
> +	struct clk *clk;
> +	void __iomem *base;
> +	unsigned int irq;
> +	int err = 0;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	irq = platform_get_irq(pdev, 0);
> +	if (!res || !irq) {
> +		err = -ENODEV;
> +		goto exit;
> +	}
> +
> +	clk = clk_get(&pdev->dev, "csi_clk");
> +	if (IS_ERR(clk)) {
> +		err = PTR_ERR(clk);
> +		goto exit;
> +	}
> +
> +	pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
> +	if (!pcdev) {
> +		dev_err(&pdev->dev, "Could not allocate pcdev\n");
> +		err = -ENOMEM;
> +		goto exit;
> +	}
> +
> +	dev_set_drvdata(&pdev->dev, pcdev);
> +	pcdev->res = res;
> +	pcdev->clk = clk;
> +
> +	pcdev->pdata = pdev->dev.platform_data;
> +	pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
> +
> +	if (!pcdev->mclk) {
> +		dev_warn(&pdev->dev,
> +			 "mclk_10khz == 0! Please, fix your platform data. "
> +			 "Using default 20MHz\n");
> +		pcdev->mclk = 20000000;
> +	}
> +
> +	INIT_LIST_HEAD(&pcdev->capture);
> +	spin_lock_init(&pcdev->lock);
> +
> +	/*
> +	 * Request the regions.
> +	 */
> +	if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
> +		err = -EBUSY;
> +		goto exit_kfree;
> +	}
> +
> +	base = ioremap(res->start, resource_size(res));
> +	if (!base) {
> +		err = -ENOMEM;
> +		goto exit_release;
> +	}
> +	pcdev->irq = irq;
> +	pcdev->base = base;
> +	pcdev->dev = &pdev->dev;
> +
> +	/* request dma */
> +	pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
> +	if (pcdev->dma_chan < 0) {
> +		dev_err(pcdev->dev, "Can't request DMA for i.MX CSI\n");
> +		err = -EBUSY;
> +		goto exit_iounmap;
> +	}
> +	dev_dbg(pcdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
> +
> +	imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
> +			       pcdev);
> +
> +	imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
> +			       IMX_DMA_MEMSIZE_32, DMA_REQ_CSI_R, 0);
> +	/* burst length : 16 words = 64 bytes */
> +	imx_dma_config_burstlen(pcdev->dma_chan, 0);
> +
> +	/* request irq */
> +	err = claim_fiq(&fh);
> +	if (err) {
> +		dev_err(pcdev->dev, "Camera interrupt register failed \n");
> +		goto exit_free_dma;
> +	}
> +
> +	set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
> +						   &mx1_camera_sof_fiq_start);
> +
> +	regs.ARM_r8 = DMA_BASE + DMA_DIMR;
> +	regs.ARM_r9 = DMA_BASE + DMA_CCR(pcdev->dma_chan);
> +	regs.ARM_r10 = (long)pcdev->base + CSICR1;
> +	regs.ARM_fp = (long)pcdev->base + CSISR;
> +	regs.ARM_sp = 1 << pcdev->dma_chan;
> +	set_fiq_regs(&regs);
> +
> +	mxc_set_irq_fiq(irq, 1);
> +	enable_fiq(irq);
> +
> +	mx1_soc_camera_host.priv	= pcdev;
> +	mx1_soc_camera_host.dev.parent	= &pdev->dev;
> +	mx1_soc_camera_host.nr		= pdev->id;
> +	err = soc_camera_host_register(&mx1_soc_camera_host);
> +	if (err)
> +		goto exit_free_irq;
> +
> +	dev_info(&pdev->dev, "i.MX Camera driver loaded\n");
> +
> +	return 0;
> +
> +exit_free_irq:
> +	disable_fiq(irq);
> +	mxc_set_irq_fiq(irq, 0);
> +	release_fiq(&fh);
> +exit_free_dma:
> +	imx_dma_free(pcdev->dma_chan);
> +exit_iounmap:
> +	iounmap(base);
> +exit_release:
> +	release_mem_region(res->start, resource_size(res));
> +exit_kfree:
> +	kfree(pcdev);
> +exit:
> +	return err;
> +}
> +
> +static int __exit mx1_camera_remove(struct platform_device *pdev)
> +{
> +	struct mx1_camera_dev *pcdev = platform_get_drvdata(pdev);
> +	struct resource *res;
> +
> +	imx_dma_free(pcdev->dma_chan);
> +	disable_fiq(pcdev->irq);
> +	mxc_set_irq_fiq(pcdev->irq, 0);
> +	release_fiq(&fh);
> +
> +	soc_camera_host_unregister(&mx1_soc_camera_host);
> +
> +	iounmap(pcdev->base);
> +
> +	res = pcdev->res;
> +	release_mem_region(res->start, resource_size(res));
> +
> +	kfree(pcdev);
> +
> +	dev_info(&pdev->dev, "i.MX Camera driver unloaded\n");
> +
> +	return 0;
> +}
> +
> +static struct platform_driver mx1_camera_driver = {
> +	.driver 	= {
> +		.name	= DRIVER_NAME,
> +	},
> +	.remove		= __exit_p(mx1_camera_remove),
> +};
> +
> +static int __init mx1_camera_init(void)
> +{
> +	return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
> +}
> +
> +static void __exit mx1_camera_exit(void)
> +{
> +	return platform_driver_unregister(&mx1_camera_driver);
> +}
> +
> +module_init(mx1_camera_init);
> +module_exit(mx1_camera_exit);
> +
> +MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
> +MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_ALIAS("platform:" DRIVER_NAME);
> 
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