Hi Darius,
I think Guennadi will have a closer look at the driver later. I looked
only at the ARM part, so only some comments inline.
Sascha
> From: Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
>
> Driver for i.MX1/L camera (CSI) host.
>
> Signed-off-by: Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
> ---
>
> Index: linux-2.6.29/drivers/media/video/imx_camera.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6.29/drivers/media/video/imx_camera.c
> @@ -0,0 +1,872 @@
> +/*
> + * V4L2 Driver for i.MX camera (CSI) host
> + *
> + * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
> + *
> + * Based on PXA SoC camera driver
> + * Copyright (C) 2006, Sascha Hauer, Pengutronix
> + * Copyright (C) 2008, Guennadi Liakhovetski <kernel@xxxxxxxxxxxxxx>
> + *
> + * 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-contig.h>
> +#include <media/soc_camera.h>
> +
> +#include <linux/videodev2.h>
> +
> +#include <asm/dma.h>
> +#include <asm/fiq.h>
> +#include <mach/hardware.h>
> +#include <mach/dma-mx1-mx2.h>
> +#include <mach/camera.h>
> +
> +/*
> + * CSI registers
> + */
> +
> +#define DMA_DIMR 0x08 /* Interrupt mask Register */
> +#define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */
> +
> +#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_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 "imx-csi"
> +
> +#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_DATAWIDTH_8)
> +
> +static DEFINE_MUTEX(camera_lock);
> +
> +static int mclk;
> +
> +/*
> + * Structures
> + */
> +
> +/* buffer for one video frame */
> +struct imx_buffer {
> + /* common v4l buffer stuff -- must be first */
> + struct videobuf_buffer vb;
> +
> + const struct soc_camera_data_format *fmt;
> +
> + int inwork;
> +};
> +
> +struct imx_camera_dev {
> + struct device *dev;
> + /* 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 soc_camera_device *icd;
> +
> + unsigned int irq;
> + void __iomem *base;
> +
> + int dma_chan;
> +
> + struct imxcamera_platform_data *pdata;
> + struct resource *res;
> + struct clk *clk;
> + unsigned long platform_mclk_10khz;
> +
> + struct list_head capture;
> +
> + spinlock_t lock;
> +
> + struct imx_buffer *active;
> +};
> +
> +static const char *imx_cam_driver_description = "i.MX_Camera";
> +
> +/*
> + * Videobuf operations
> + */
> +static int imx_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 (0 == *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 imx_buffer *buf)
> +{
> + struct soc_camera_device *icd = vq->priv_data;
> +
> + BUG_ON(in_interrupt());
> +
> + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> + &buf->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(&buf->vb, 0, 0);
> + videobuf_dma_contig_free(vq, &buf->vb);
> +
> + buf->vb.state = VIDEOBUF_NEEDS_INIT;
> +}
> +
> +static int imx_videobuf_prepare(struct videobuf_queue *vq,
> + struct videobuf_buffer *vb, enum v4l2_field field)
> +{
> + struct soc_camera_device *icd = vq->priv_data;
> + struct imx_buffer *buf = container_of(vb, struct imx_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 imx_camera_setup_dma(struct imx_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 imx_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 imx_camera_dev *pcdev = ici->priv;
> + struct imx_buffer *buf = container_of(vb, struct imx_buffer, vb);
> + unsigned long flags;
> +
> + dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
> + vb, vb->baddr, vb->bsize);
> + spin_lock_irqsave(&pcdev->lock, flags);
> +
> + list_add_tail(&vb->queue, &pcdev->capture);
> +
> + vb->state = VIDEOBUF_ACTIVE;
> +
> + if (!pcdev->active) {
> + pcdev->active = buf;
> +
> + /* setup sg list for future DMA */
> + if (!imx_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);
> + }
> + }
> +
> + spin_unlock_irqrestore(&pcdev->lock, flags);
> +}
> +
> +static void imx_videobuf_release(struct videobuf_queue *vq,
> + struct videobuf_buffer *vb)
> +{
> + struct imx_buffer *buf = container_of(vb, struct imx_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 inline void imx_camera_wakeup(struct imx_camera_dev *pcdev,
> + struct videobuf_buffer *vb,
> + struct imx_buffer *buf)
> +{
> + /* _init is used to debug races, see comment in imx_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 imx_buffer, vb.queue);
> +
> + /* setup sg list for future DMA */
> + if (likely(!imx_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 imx_camera_dma_irq(int channel, void *data)
> +{
> + struct imx_camera_dev *pcdev = data;
> + struct imx_buffer *buf;
> + unsigned long flags;
> + struct videobuf_buffer *vb;
> +
> + spin_lock_irqsave(&pcdev->lock, flags);
> +
> + imx_dma_disable(channel);
> +
> + if (unlikely(!pcdev->active)) {
> + dev_err(pcdev->dev, "DMA End IRQ with no active buffer\n");
> + goto out;
> + }
> +
> + vb = &pcdev->active->vb;
> + buf = container_of(vb, struct imx_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);
> +
> + imx_camera_wakeup(pcdev, vb, buf);
> +
> +out:
> + spin_unlock_irqrestore(&pcdev->lock, flags);
> +}
> +
> +static struct videobuf_queue_ops imx_videobuf_ops = {
> + .buf_setup = imx_videobuf_setup,
> + .buf_prepare = imx_videobuf_prepare,
> + .buf_queue = imx_videobuf_queue,
> + .buf_release = imx_videobuf_release,
> +};
> +
> +static void imx_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 imx_camera_dev *pcdev = ici->priv;
> +
> + videobuf_queue_dma_contig_init(q, &imx_videobuf_ops, pcdev->dev,
> + &pcdev->lock,
> + V4L2_BUF_TYPE_VIDEO_CAPTURE,
> + V4L2_FIELD_NONE,
> + sizeof(struct imx_buffer), icd);
> +}
> +
> +static int mclk_get_divisor(struct imx_camera_dev *pcdev)
> +{
> + unsigned int mclk_10khz = pcdev->platform_mclk_10khz;
> + unsigned long div;
> + unsigned long lcdclk;
> +
> + lcdclk = clk_get_rate(pcdev->clk) / 10000;
> +
> + /* We verify platform_mclk_10khz != 0, so if anyone breaks it, here
> + * they get a nice Oops */
> + div = (lcdclk + 2 * mclk_10khz - 1) / (2 * mclk_10khz) - 1;
> +
> + dev_dbg(pcdev->dev, "System clock %lukHz, target freq %dkHz, "
> + "divisor %lu\n", lcdclk * 10, mclk_10khz * 10, div);
> +
> + return div;
> +}
> +
> +static void imx_camera_activate(struct imx_camera_dev *pcdev)
> +{
> + struct imxcamera_platform_data *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);
> + }
> +
> + if (pdata && pdata->power) {
> + dev_dbg(pcdev->dev, "%s: Power on camera\n", __func__);
> + pdata->power(pcdev->dev, 1);
> + }
> +
> + 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);
> +
> + if (pdata && pdata->reset) {
> + dev_dbg(pcdev->dev, "%s: Releasing camera reset\n",
> + __func__);
> + pdata->reset(pcdev->dev, 1);
> + }
> +}
> +
> +static void imx_camera_deactivate(struct imx_camera_dev *pcdev)
> +{
> + struct imxcamera_platform_data *board = pcdev->pdata;
> +
> + /* Disable all CSI interface */
> + __raw_writel(0x00, pcdev->base + CSICR1);
> +
> + clk_disable(pcdev->clk);
> +
> + if (board && board->reset) {
> + dev_dbg(pcdev->dev, "%s: Asserting camera reset\n",
> + __func__);
> + board->reset(pcdev->dev, 0);
> + }
> +
> + if (board && board->power) {
> + dev_dbg(pcdev->dev, "%s: Power off camera\n", __func__);
> + board->power(pcdev->dev, 0);
> + }
> +
> + 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 imx_camera_add_device(struct soc_camera_device *icd)
> +{
> + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> + struct imx_camera_dev *pcdev = ici->priv;
> + int ret;
> +
> + mutex_lock(&camera_lock);
> +
> + if (pcdev->icd) {
> + ret = -EBUSY;
> + goto ebusy;
> + }
> +
> + dev_info(&icd->dev, "i.MX Camera driver attached to camera %d\n",
> + icd->devnum);
> +
> + imx_camera_activate(pcdev);
> + ret = icd->ops->init(icd);
> +
> + if (!ret)
> + pcdev->icd = icd;
> +
> +ebusy:
> + mutex_unlock(&camera_lock);
> +
> + return ret;
> +}
> +
> +static void imx_camera_remove_device(struct soc_camera_device *icd)
> +{
> + struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
> + struct imx_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);
> +
> + imx_camera_deactivate(pcdev);
> +
> + pcdev->icd = NULL;
> +}
> +
> +static int imx_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
> +{
> + struct soc_camera_host *ici =
> + to_soc_camera_host(icd->dev.parent);
> + struct imx_camera_dev *pcdev = ici->priv;
> + unsigned long camera_flags, common_flags;
> + unsigned int csicr1;
> + int ret;
> +
> + camera_flags = icd->ops->query_bus_param(icd);
> +
> + common_flags = soc_camera_bus_param_compatible(camera_flags,
> + CSI_BUS_FLAGS);
> + if (!common_flags)
> + return -EINVAL;
> +
> + if (!(common_flags & SOCAM_DATAWIDTH_8)) {
> + dev_warn(&icd->dev, "Camera sensor doesn't support 8-bit bus "
> + "width\n");
> + /* set it so sensor set_bus_param could fail */
> + common_flags |= SOCAM_DATAWIDTH_8;
> + }
> +
> + icd->buswidth = 8;
> +
> + /* Make choises, based on platform defaults */
> + if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
> + (common_flags & SOCAM_VSYNC_ACTIVE_LOW))
> + common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
> +
> + if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
> + (common_flags & SOCAM_PCLK_SAMPLE_FALLING))
> + common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
> +
> + 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;
> +
> + __raw_writel(csicr1, pcdev->base + CSICR1);
> +
> + return 0;
> +}
> +
> +static int imx_camera_set_fmt(struct soc_camera_device *icd,
> + __u32 pixfmt, struct v4l2_rect *rect)
> +{
> + return icd->ops->set_fmt(icd, pixfmt, rect);
> +}
> +
> +static int imx_camera_try_fmt(struct soc_camera_device *icd,
> + struct v4l2_format *f)
> +{
> + /* TODO: limit to imx hardware capabilities */
> +
> + /* limit to sensor capabilities */
> + return icd->ops->try_fmt(icd, f);
> +}
> +
> +static int imx_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 imx_buffer *buf = container_of(icf->vb_vidq.bufs[i],
> + struct imx_buffer, vb);
> + buf->inwork = 0;
> + INIT_LIST_HEAD(&buf->vb.queue);
> + }
> +
> + return 0;
> +}
> +
> +static unsigned int imx_camera_poll(struct file *file, poll_table *pt)
> +{
> + struct soc_camera_file *icf = file->private_data;
> + struct imx_buffer *buf;
> +
> + buf = list_entry(icf->vb_vidq.stream.next, struct imx_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 imx_camera_querycap(struct soc_camera_host *ici,
> + struct v4l2_capability *cap)
> +{
> + /* cap->name is set by the firendly caller:-> */
> + strlcpy(cap->card, imx_cam_driver_description, sizeof(cap->card));
> + cap->version = VERSION_CODE;
> + cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> +
> + return 0;
> +}
> +
> +static struct soc_camera_host_ops imx_soc_camera_host_ops = {
> + .owner = THIS_MODULE,
> + .add = imx_camera_add_device,
> + .remove = imx_camera_remove_device,
> + .set_fmt = imx_camera_set_fmt,
> + .try_fmt = imx_camera_try_fmt,
> + .init_videobuf = imx_camera_init_videobuf,
> + .reqbufs = imx_camera_reqbufs,
> + .poll = imx_camera_poll,
> + .querycap = imx_camera_querycap,
> + .set_bus_param = imx_camera_set_bus_param,
> +};
> +
> +/* Should be allocated dynamically too, but we have only one. */
> +static struct soc_camera_host imx_soc_camera_host = {
> + .drv_name = DRIVER_NAME,
> + .ops = &imx_soc_camera_host_ops,
> +};
> +
> +static struct fiq_handler fh = {
> + .name = "csi_sof"
> +};
> +
> +static int __init imx_camera_probe(struct platform_device *pdev)
> +{
> + struct imx_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;
> +
> + if (pcdev->pdata)
> + pcdev->platform_mclk_10khz = pcdev->pdata->mclk_10khz;
> + else
> + dev_warn(&pdev->dev, "No platform data provided!\n");
> +
> + /* override if user entered mclk frequency as module param */
> + if (mclk)
> + pcdev->platform_mclk_10khz = mclk / 10000;
> +
> + if (!pcdev->platform_mclk_10khz) {
> + dev_warn(&pdev->dev,
> + "mclk_10khz == 0! Please, fix your platform data. "
> + "Using default 20MHz\n");
> + pcdev->platform_mclk_10khz = 2000;
> + }
> +
> + INIT_LIST_HEAD(&pcdev->capture);
> + spin_lock_init(&pcdev->lock);
> +
> + /*
> + * Request the regions.
> + */
> + if (!request_mem_region(res->start, res->end - res->start + 1,
> + DRIVER_NAME)) {
You already know what we're usually nagging about here.
> + err = -EBUSY;
> + goto exit_kfree;
> + }
> +
> + base = ioremap(res->start, res->end - res->start + 1);
and here
> + 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 = -ENOMEM;
> + goto exit_iounmap;
> + }
> + dev_dbg(pcdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
> +
> + imx_dma_setup_handlers(pcdev->dma_chan, imx_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(&imx_camera_sof_fiq_start, &imx_camera_sof_fiq_end -
> + &imx_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(®s);
> +
> + mxc_set_irq_fiq(irq, 1);
> + enable_fiq(irq);
> +
> + imx_soc_camera_host.priv = pcdev;
> + imx_soc_camera_host.dev.parent = &pdev->dev;
> + imx_soc_camera_host.nr = pdev->id;
> + err = soc_camera_host_register(&imx_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, res->end - res->start + 1);
ditto
> +exit_kfree:
> + kfree(pcdev);
> +exit:
> + return err;
> +}
> +
> +static int __exit imx_camera_remove(struct platform_device *pdev)
> +{
> + struct imx_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(&imx_soc_camera_host);
> +
> + iounmap(pcdev->base);
> +
> + res = pcdev->res;
> + release_mem_region(res->start, res->end - res->start + 1);
> +
> + kfree(pcdev);
> +
> + dev_info(&pdev->dev, "i.MX Camera driver unloaded\n");
> +
> + return 0;
> +}
> +
> +static int imx_camera_suspend(struct platform_device *pdev, pm_message_t state)
> +{
> + struct imx_camera_dev *pcdev = platform_get_drvdata(pdev);
> + struct imxcamera_platform_data *pdata = pcdev->pdata;
> +
> + if (pcdev->active)
> + return -EBUSY;
> +
> + if (pdata && pdata->power) {
> + dev_dbg(pcdev->dev, "%s: Power off camera\n", __func__);
> + pdata->power(pcdev->dev, 0);
> + }
> +
> + return 0;
> +}
> +
> +static int imx_camera_resume(struct platform_device *pdev)
> +{
> + struct imx_camera_dev *pcdev = platform_get_drvdata(pdev);
> + struct imxcamera_platform_data *pdata = pcdev->pdata;
> +
> + if (pdata && pdata->power) {
> + dev_dbg(pcdev->dev, "%s: Power on camera\n", __func__);
> + pdata->power(pcdev->dev, 1);
> + }
> +
> + return 0;
> +}
> +
> +static struct platform_driver imx_camera_driver = {
> + .driver = {
> + .name = DRIVER_NAME,
> + },
> + .remove = __exit_p(imx_camera_remove),
> + .suspend = imx_camera_suspend,
> + .resume = imx_camera_resume,
> +};
> +
> +static int __init imx_camera_init(void)
> +{
> + return platform_driver_probe(&imx_camera_driver, imx_camera_probe);
> +}
> +
> +static void __exit imx_camera_exit(void)
> +{
> + return platform_driver_unregister(&imx_camera_driver);
> +}
> +
> +module_init(imx_camera_init);
> +module_exit(imx_camera_exit);
> +
> +MODULE_DESCRIPTION("i.MX SoC Camera Host driver");
> +MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:" DRIVER_NAME);
> +
> +module_param(mclk, int, 0);
> +MODULE_PARM_DESC(mclk, "MCLK value in Hz");
> Index: linux-2.6.29/drivers/media/video/Kconfig
> ===================================================================
> --- linux-2.6.29.orig/drivers/media/video/Kconfig
> +++ linux-2.6.29/drivers/media/video/Kconfig
> @@ -929,4 +929,13 @@ config USB_S2255
>
> endif # V4L_USB_DRIVERS
>
> +config VIDEO_IMX
> + tristate "i.MX CMOS Sensor Interface driver"
> + depends on VIDEO_DEV && ARCH_MX1
> + select FIQ
> + select SOC_CAMERA
> + select VIDEOBUF_DMA_CONTIG
> + ---help---
> + This is a v4l2 driver for the i.MX CMOS Sensor Interface
> +
> endif # VIDEO_CAPTURE_DRIVERS
> Index: linux-2.6.29/drivers/media/video/Makefile
> ===================================================================
> --- linux-2.6.29.orig/drivers/media/video/Makefile
> +++ linux-2.6.29/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_IMX) += imx_camera.o
> obj-$(CONFIG_VIDEO_PXA27x) += pxa_camera.o
> obj-$(CONFIG_VIDEO_SH_MOBILE_CEU) += sh_mobile_ceu_camera.o
> obj-$(CONFIG_VIDEO_OMAP2) += omap2cam.o
> Index: linux-2.6.29/arch/arm/mach-mx1/Makefile
> ===================================================================
> --- linux-2.6.29.orig/arch/arm/mach-mx1/Makefile
> +++ linux-2.6.29/arch/arm/mach-mx1/Makefile
> @@ -4,7 +4,7 @@
>
> # Object file lists.
>
> -obj-y += generic.o clock.o devices.o
> +obj-y += generic.o clock.o devices.o ksym_mx1.o
>
> # Power management
> obj-$(CONFIG_PM) += pm.o
> @@ -13,5 +13,10 @@ ifeq ($(CONFIG_PM_DEBUG),y)
> CFLAGS_pm.o += -DDEBUG
> endif
>
> +# Support for CMOS sensor interface
> +ifdef CONFIG_VIDEO_IMX
> +obj-y += imx_camera_fiq.o
> +endif
> +
> # Specific board support
> obj-$(CONFIG_ARCH_MX1ADS) += mx1ads.o
> Index: linux-2.6.29/arch/arm/plat-mxc/include/mach/memory.h
> ===================================================================
> --- linux-2.6.29.orig/arch/arm/plat-mxc/include/mach/memory.h
> +++ linux-2.6.29/arch/arm/plat-mxc/include/mach/memory.h
> @@ -19,4 +19,12 @@
> #define PHYS_OFFSET UL(0x80000000)
> #endif
>
> +#if defined(CONFIG_VIDEO_IMX) || defined(CONFIG_VIDEO_IMX_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_IMX */
> +
> #endif /* __ASM_ARCH_MXC_MEMORY_H__ */
> Index: linux-2.6.29/arch/arm/plat-mxc/include/mach/camera.h
As we will get a camera specific header for mx3 and maybe even mx2,
please rename this to something like mx1-camera.h.
> ===================================================================
> --- /dev/null
> +++ linux-2.6.29/arch/arm/plat-mxc/include/mach/camera.h
> @@ -0,0 +1,27 @@
> +/*
> + * camera.h - i.MX camera driver header file
> + *
> + * Copyright (c) 2008, Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
> + *
> + * Based on PXA camera.h file:
> + * Copyright (C) 2003, Intel Corporation
> + * Copyright (C) 2008, Guennadi Liakhovetski <kernel@xxxxxxxxxxxxxx>
> + *
> + * This file is released under the GPLv2
> + */
> +
> +#ifndef __ASM_ARCH_CAMERA_H_
> +#define __ASM_ARCH_CAMERA_H_
> +
> +extern unsigned char imx_camera_sof_fiq_start, imx_camera_sof_fiq_end;
> +
> +struct imxcamera_platform_data {
> + int (*init)(struct device *);
> + int (*exit)(struct device *);
> + int (*power)(struct device *, int);
> + int (*reset)(struct device *, int);
> +
> + unsigned long mclk_10khz;
> +};
> +
> +#endif /* __ASM_ARCH_CAMERA_H_ */
> Index: linux-2.6.29/arch/arm/mach-mx1/imx_camera_fiq.S
> ===================================================================
> --- /dev/null
> +++ linux-2.6.29/arch/arm/mach-mx1/imx_camera_fiq.S
> @@ -0,0 +1,35 @@
> +/*
> + * Copyright (C) 2008 Paulius Zaleckas <paulius.zaleckas@xxxxxxxxxxxx>
> + *
> + * 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 imx_camera_sof_fiq_end
> + .global imx_camera_sof_fiq_start
> +imx_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
> +imx_camera_sof_fiq_end:
> Index: linux-2.6.29/arch/arm/mach-mx1/ksym_mx1.c
> ===================================================================
> --- /dev/null
> +++ linux-2.6.29/arch/arm/mach-mx1/ksym_mx1.c
> @@ -0,0 +1,23 @@
> +/*
> + * Exported ksyms of ARCH_MX1
> + *
> + * Copyright (C) 2008, Darius Augulis <augulis.darius@xxxxxxxxx>
> + *
> + *
> + * 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/platform_device.h>
> +#include <linux/module.h>
> +
> +
> +#if defined(CONFIG_VIDEO_IMX) || defined(CONFIG_VIDEO_IMX_MODULE)
> +#include <mach/camera.h>
> +
> +/* IMX camera FIQ handler */
> +EXPORT_SYMBOL(imx_camera_sof_fiq_start);
> +EXPORT_SYMBOL(imx_camera_sof_fiq_end);
> +#endif
--
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