- 根目录:
- drivers
- media
- platform
- soc_camera
- mx1_camera.c
/*
* 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/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/time.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 <media/soc_mediabus.h>
#include <asm/dma.h>
#include <asm/fiq.h>
#include <mach/dma-mx1-mx2.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <linux/platform_data/camera-mx1.h>
/*
* CSI 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_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 DRIVER_VERSION "0.0.2"
#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 (V4L2_MBUS_MASTER | V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW | \
V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING | \
V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_LOW)
#define MAX_VIDEO_MEM 16 /* Video memory limit in megabytes */
/*
* Structures
*/
/* buffer for one video frame */
struct mx1_buffer {
/* common v4l buffer stuff -- must be first */
struct videobuf_buffer vb;
enum v4l2_mbus_pixelcode code;
int inwork;
};
/*
* i.MX1/i.MXL 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_host soc_host;
struct soc_camera_device *icd;
struct mx1_camera_pdata *pdata;
struct mx1_buffer *active;
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->sizeimage;
if (!*count)
*count = 32;
if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
*count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
dev_dbg(icd->parent, "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->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
vb, vb->baddr, 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(vq, vb, 0, 0);
videobuf_dma_contig_free(vq, vb);
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->parent, "%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->code != icd->current_fmt->code ||
vb->width != icd->user_width ||
vb->height != icd->user_height ||
vb->field != field) {
buf->code = icd->current_fmt->code;
vb->width = icd->user_width;
vb->height = icd->user_height;
vb->field = field;
vb->state = VIDEOBUF_NEEDS_INIT;
}
vb->size = icd->sizeimage;
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;
struct device *dev = pcdev->icd->parent;
int ret;
if (unlikely(!pcdev->active)) {
dev_err(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(dev, "Failed to setup DMA sg list\n");
return ret;
}
/* Called under spinlock_irqsave(&pcdev->lock, ...) */
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->parent);
struct mx1_camera_dev *pcdev = ici->priv;
struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
dev_dbg(icd->parent, "%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;
struct device *dev = icd->parent;
dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
vb, vb->baddr, vb->bsize);
switch (vb->state) {
case VIDEOBUF_ACTIVE:
dev_dbg(dev, "%s (active)\n", __func__);
break;
case VIDEOBUF_QUEUED:
dev_dbg(dev, "%s (queued)\n", __func__);
break;
case VIDEOBUF_PREPARED:
dev_dbg(dev, "%s (prepared)\n", __func__);
break;
default:
dev_dbg(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;
v4l2_get_timestamp(&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 device *dev = pcdev->icd->parent;
struct mx1_buffer *buf;
struct videobuf_buffer *vb;
unsigned long flags;
spin_lock_irqsave(&pcdev->lock, flags);
imx_dma_disable(channel);
if (unlikely(!pcdev->active)) {
dev_err(dev, "DMA End IRQ with no active buffer\n");
goto out;
}
vb = &pcdev->active->vb;
buf = container_of(vb, struct mx1_buffer, vb);
WARN_ON(buf->inwork || list_empty(&vb->queue));
dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
vb, vb->baddr, vb->bsize);
mx1_camera_wakeup(pcdev, vb, buf);
out:
spin_unlock_irqrestore(&pcdev->lock, flags);
}
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->parent);
struct mx1_camera_dev *pcdev = ici->priv;
videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, icd->parent,
&pcdev->lock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
V4L2_FIELD_NONE,
sizeof(struct mx1_buffer), icd, &ici->host_lock);
}
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->icd->parent,
"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)
{
unsigned int csicr1 = CSICR1_EN;
dev_dbg(pcdev->icd->parent, "Activate device\n");
clk_prepare_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)
{
dev_dbg(pcdev->icd->parent, "Deactivate device\n");
/* Disable all CSI interface */
__raw_writel(0x00, pcdev->base + CSICR1);
clk_disable_unprepare(pcdev->clk);
}
/*
* The following two functions absolutely depend on the fact, that
* there can be only one camera on i.MX1/i.MXL camera sensor interface
*/
static int mx1_camera_add_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct mx1_camera_dev *pcdev = ici->priv;
if (pcdev->icd)
return -EBUSY;
dev_info(icd->parent, "MX1 Camera driver attached to camera %d\n",
icd->devnum);
mx1_camera_activate(pcdev);
pcdev->icd = icd;
return 0;
}
static void mx1_camera_remove_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->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->parent, "MX1 Camera driver detached from camera %d\n",
icd->devnum);
mx1_camera_deactivate(pcdev);
pcdev->icd = NULL;
}
static int mx1_camera_set_bus_param(struct soc_camera_device *icd)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
struct mx1_camera_dev *pcdev = ici->priv;
struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
unsigned long common_flags;
unsigned int csicr1;
int ret;
/* MX1 supports only 8bit buswidth */
ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
if (!ret) {
common_flags = soc_mbus_config_compatible(&cfg, CSI_BUS_FLAGS);
if (!common_flags) {
dev_warn(icd->parent,
"Flags incompatible: camera 0x%x, host 0x%x\n",
cfg.flags, CSI_BUS_FLAGS);
return -EINVAL;
}
} else if (ret != -ENOIOCTLCMD) {
return ret;
} else {
common_flags = CSI_BUS_FLAGS;
}
/* Make choises, based on platform choice */
if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
(common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
if (!pcdev->pdata ||
pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
else
common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
}
if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
(common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
if (!pcdev->pdata ||
pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
else
common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
}
if ((common_flags & V4L2_MBUS_DATA_ACTIVE_HIGH) &&
(common_flags & V4L2_MBUS_DATA_ACTIVE_LOW)) {
if (!pcdev->pdata ||
pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
common_flags &= ~V4L2_MBUS_DATA_ACTIVE_LOW;
else
common_flags &= ~V4L2_MBUS_DATA_ACTIVE_HIGH;
}
cfg.flags = common_flags;
ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
if (ret < 0 && ret != -ENOIOCTLCMD) {
dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
common_flags, ret);
return ret;
}
csicr1 = __raw_readl(pcdev->base + CSICR1);
if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
csicr1 |= CSICR1_REDGE;
if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
csicr1 |= CSICR1_SOF_POL;
if (common_flags & V4L2_MBUS_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 v4l2_subdev *sd = soc_camera_to_subdev(icd);
const struct soc_camera_format_xlate *xlate;
struct v4l2_pix_format *pix = &f->fmt.pix;
struct v4l2_mbus_framefmt mf;
int ret, buswidth;
xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
if (!xlate) {
dev_warn(icd->parent, "Format %x not found\n",
pix->pixelformat);
return -EINVAL;
}
buswidth = xlate->host_fmt->bits_per_sample;
if (buswidth > 8) {
dev_warn(icd->parent,
"bits-per-sample %d for format %x unsupported\n",
buswidth, pix->pixelformat);
return -EINVAL;
}
mf.width = pix->width;
mf.height = pix->height;
mf.field = pix->field;
mf.colorspace = pix->colorspace;
mf.code = xlate->code;
ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
if (ret < 0)
return ret;
if (mf.code != xlate->code)
return -EINVAL;
pix->width = mf.width;
pix->height = mf.height;
pix->field = mf.field;
pix->colorspace = mf.colorspace;
icd->current_fmt = xlate;
return ret;
}
static int mx1_camera_try_fmt(struct soc_camera_device *icd,
struct v4l2_format *f)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
const struct soc_camera_format_xlate *xlate;
struct v4l2_pix_format *pix = &f->fmt.pix;
struct v4l2_mbus_framefmt mf;
int ret;
/* TODO: limit to mx1 hardware capabilities */
xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
if (!xlate) {
dev_warn(icd->parent, "Format %x not found\n",
pix->pixelformat);
return -EINVAL;
}
mf.width = pix->width;
mf.height = pix->height;
mf.field = pix->field;
mf.colorspace = pix->colorspace;
mf.code = xlate->code;
/* limit to sensor capabilities */
ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
if (ret < 0)
return ret;
pix->width = mf.width;
pix->height = mf.height;
pix->field = mf.field;
pix->colorspace = mf.colorspace;
return 0;
}
static int mx1_camera_reqbufs(struct soc_camera_device *icd,
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(icd->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_device *icd = file->private_data;
struct mx1_buffer *buf;
buf = list_entry(icd->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->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,
.set_bus_param = mx1_camera_set_bus_param,
.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,
};
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 || (int)irq <= 0) {
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_put_clk;
}
pcdev->res = res;
pcdev->clk = clk;
pcdev->pdata = pdev->dev.platform_data;
if (pcdev->pdata)
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;
/* request dma */
pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
if (pcdev->dma_chan < 0) {
dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n");
err = -EBUSY;
goto exit_iounmap;
}
dev_dbg(&pdev->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, MX1_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(&pdev->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 = (long)MX1_DMA_DIMR;
regs.ARM_r9 = (long)MX1_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);
pcdev->soc_host.drv_name = DRIVER_NAME;
pcdev->soc_host.ops = &mx1_soc_camera_host_ops;
pcdev->soc_host.priv = pcdev;
pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
pcdev->soc_host.nr = pdev->id;
err = soc_camera_host_register(&pcdev->soc_host);
if (err)
goto exit_free_irq;
dev_info(&pdev->dev, "MX1 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_put_clk:
clk_put(clk);
exit:
return err;
}
static int __exit mx1_camera_remove(struct platform_device *pdev)
{
struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
struct mx1_camera_dev *pcdev = container_of(soc_host,
struct mx1_camera_dev, soc_host);
struct resource *res;
imx_dma_free(pcdev->dma_chan);
disable_fiq(pcdev->irq);
mxc_set_irq_fiq(pcdev->irq, 0);
release_fiq(&fh);
clk_put(pcdev->clk);
soc_camera_host_unregister(soc_host);
iounmap(pcdev->base);
res = pcdev->res;
release_mem_region(res->start, resource_size(res));
kfree(pcdev);
dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
return 0;
}
static struct platform_driver mx1_camera_driver = {
.driver = {
.name = DRIVER_NAME,
},
.remove = __exit_p(mx1_camera_remove),
};
module_platform_driver_probe(mx1_camera_driver, mx1_camera_probe);
MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(DRIVER_VERSION);
MODULE_ALIAS("platform:" DRIVER_NAME);