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linux/drivers/media/video/mx3_camera.c

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/*
* 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 <linux/sched.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/videobuf-dma-contig.h>
#include <media/soc_camera.h>
#include <media/soc_mediabus.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;
enum v4l2_mbus_pixelcode code;
/* 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 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\n",
desc->txd.cookie, mx3_cam->active ? sg_dma_address(&mx3_cam->active->sg) : 0);
spin_lock(&mx3_cam->lock);
if (mx3_cam->active) {
vb = &mx3_cam->active->vb;
list_del_init(&vb->queue);
vb->state = VIDEOBUF_DONE;
do_gettimeofday(&vb->ts);
vb->field_count++;
wake_up(&vb->done);
}
if (list_empty(&mx3_cam->capture)) {
mx3_cam->active = NULL;
spin_unlock(&mx3_cam->lock);
/*
* stop capture - without further buffers IPU_CHA_BUF0_RDY will
* not get updated
*/
return;
}
mx3_cam->active = list_entry(mx3_cam->capture.next,
struct mx3_camera_buffer, vb.queue);
mx3_cam->active->vb.state = VIDEOBUF_ACTIVE;
spin_unlock(&mx3_cam->lock);
}
static void free_buffer(struct videobuf_queue *vq, struct mx3_camera_buffer *buf)
{
struct soc_camera_device *icd = vq->priv_data;
struct videobuf_buffer *vb = &buf->vb;
struct dma_async_tx_descriptor *txd = buf->txd;
struct idmac_channel *ichan;
BUG_ON(in_interrupt());
dev_dbg(icd->dev.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(vb, 0, 0);
if (txd) {
ichan = to_idmac_chan(txd->chan);
async_tx_ack(txd);
}
videobuf_dma_contig_free(vq, vb);
buf->txd = NULL;
vb->state = VIDEOBUF_NEEDS_INIT;
}
/*
* Videobuf operations
*/
/*
* Calculate the __buffer__ (not data) size and number of buffers.
* Called with .vb_lock held
*/
static int mx3_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.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
icd->current_fmt->host_fmt);
if (bytes_per_line < 0)
return bytes_per_line;
if (!mx3_cam->idmac_channel[0])
return -EINVAL;
*size = bytes_per_line * icd->user_height;
if (!*count)
*count = 32;
if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
*count = MAX_VIDEO_MEM * 1024 * 1024 / *size;
return 0;
}
/* Called with .vb_lock held */
static int mx3_videobuf_prepare(struct videobuf_queue *vq,
struct videobuf_buffer *vb, enum v4l2_field field)
{
struct soc_camera_device *icd = vq->priv_data;
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
struct mx3_camera_buffer *buf =
container_of(vb, struct mx3_camera_buffer, vb);
size_t new_size;
int ret;
int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
icd->current_fmt->host_fmt);
if (bytes_per_line < 0)
return bytes_per_line;
new_size = bytes_per_line * icd->user_height;
/*
* I think, in buf_prepare you only have to protect global data,
* the actual buffer is yours
*/
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;
if (vb->state != VIDEOBUF_NEEDS_INIT)
free_buffer(vq, buf);
}
if (vb->baddr && vb->bsize < new_size) {
/* User provided buffer, but it is too small */
ret = -ENOMEM;
goto out;
}
if (vb->state == VIDEOBUF_NEEDS_INIT) {
struct idmac_channel *ichan = mx3_cam->idmac_channel[0];
struct scatterlist *sg = &buf->sg;
/*
* The total size of video-buffers that will be allocated / mapped.
* *size that we calculated in videobuf_setup gets assigned to
* vb->bsize, and now we use the same calculation to get vb->size.
*/
vb->size = new_size;
/* This actually (allocates and) maps buffers */
ret = videobuf_iolock(vq, vb, NULL);
if (ret)
goto fail;
/*
* We will have to configure the IDMAC channel. It has two slots
* for DMA buffers, we shall enter the first two buffers there,
* and then submit new buffers in DMA-ready interrupts
*/
sg_init_table(sg, 1);
sg_dma_address(sg) = videobuf_to_dma_contig(vb);
sg_dma_len(sg) = vb->size;
buf->txd = ichan->dma_chan.device->device_prep_slave_sg(
&ichan->dma_chan, sg, 1, DMA_FROM_DEVICE,
DMA_PREP_INTERRUPT);
if (!buf->txd) {
ret = -EIO;
goto fail;
}
buf->txd->callback_param = buf->txd;
buf->txd->callback = mx3_cam_dma_done;
vb->state = VIDEOBUF_PREPARED;
}
return 0;
fail:
free_buffer(vq, buf);
out:
return ret;
}
static enum pixel_fmt fourcc_to_ipu_pix(__u32 fourcc)
{
/* Add more formats as need arises and test possibilities appear... */
switch (fourcc) {
case V4L2_PIX_FMT_RGB565:
return IPU_PIX_FMT_RGB565;
case V4L2_PIX_FMT_RGB24:
return IPU_PIX_FMT_RGB24;
case V4L2_PIX_FMT_RGB332:
return IPU_PIX_FMT_RGB332;
case V4L2_PIX_FMT_YUV422P:
return IPU_PIX_FMT_YVU422P;
default:
return IPU_PIX_FMT_GENERIC;
}
}
/*
* Called with .vb_lock mutex held and
* under spinlock_irqsave(&mx3_cam->lock, ...)
*/
static void mx3_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 mx3_camera_dev *mx3_cam = ici->priv;
struct mx3_camera_buffer *buf =
container_of(vb, struct mx3_camera_buffer, vb);
struct dma_async_tx_descriptor *txd = buf->txd;
struct idmac_channel *ichan = to_idmac_chan(txd->chan);
struct idmac_video_param *video = &ichan->params.video;
dma_cookie_t cookie;
u32 fourcc = icd->current_fmt->host_fmt->fourcc;
BUG_ON(!irqs_disabled());
/* This is the configuration of one sg-element */
video->out_pixel_fmt = fourcc_to_ipu_pix(fourcc);
video->out_width = icd->user_width;
video->out_height = icd->user_height;
video->out_stride = icd->user_width;
#ifdef DEBUG
/* helps to see what DMA actually has written */
memset((void *)vb->baddr, 0xaa, vb->bsize);
#endif
list_add_tail(&vb->queue, &mx3_cam->capture);
if (!mx3_cam->active) {
mx3_cam->active = buf;
vb->state = VIDEOBUF_ACTIVE;
} else {
vb->state = VIDEOBUF_QUEUED;
}
spin_unlock_irq(&mx3_cam->lock);
cookie = txd->tx_submit(txd);
dev_dbg(icd->dev.parent, "Submitted cookie %d DMA 0x%08x\n",
cookie, sg_dma_address(&buf->sg));
spin_lock_irq(&mx3_cam->lock);
if (cookie >= 0)
return;
/* Submit error */
vb->state = VIDEOBUF_PREPARED;
list_del_init(&vb->queue);
if (mx3_cam->active == buf)
mx3_cam->active = NULL;
}
/* Called with .vb_lock held */
static void mx3_videobuf_release(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 mx3_camera_dev *mx3_cam = ici->priv;
struct mx3_camera_buffer *buf =
container_of(vb, struct mx3_camera_buffer, vb);
unsigned long flags;
dev_dbg(icd->dev.parent,
"Release%s DMA 0x%08x (state %d), queue %sempty\n",
mx3_cam->active == buf ? " active" : "", sg_dma_address(&buf->sg),
vb->state, list_empty(&vb->queue) ? "" : "not ");
spin_lock_irqsave(&mx3_cam->lock, flags);
if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) &&
!list_empty(&vb->queue)) {
vb->state = VIDEOBUF_ERROR;
list_del_init(&vb->queue);
if (mx3_cam->active == buf)
mx3_cam->active = NULL;
}
spin_unlock_irqrestore(&mx3_cam->lock, flags);
free_buffer(vq, buf);
}
static struct videobuf_queue_ops mx3_videobuf_ops = {
.buf_setup = mx3_videobuf_setup,
.buf_prepare = mx3_videobuf_prepare,
.buf_queue = mx3_videobuf_queue,
.buf_release = mx3_videobuf_release,
};
static void mx3_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 mx3_camera_dev *mx3_cam = ici->priv;
videobuf_queue_dma_contig_init(q, &mx3_videobuf_ops, icd->dev.parent,
&mx3_cam->lock,
V4L2_BUF_TYPE_VIDEO_CAPTURE,
V4L2_FIELD_NONE,
sizeof(struct mx3_camera_buffer), icd);
}
/* First part of ipu_csi_init_interface() */
static void mx3_camera_activate(struct mx3_camera_dev *mx3_cam,
struct soc_camera_device *icd)
{
u32 conf;
long rate;
/* Set default size: ipu_csi_set_window_size() */
csi_reg_write(mx3_cam, (640 - 1) | ((480 - 1) << 16), CSI_ACT_FRM_SIZE);
/* ...and position to 0:0: ipu_csi_set_window_pos() */
conf = csi_reg_read(mx3_cam, CSI_OUT_FRM_CTRL) & 0xffff0000;
csi_reg_write(mx3_cam, conf, CSI_OUT_FRM_CTRL);
/* We use only gated clock synchronisation mode so far */
conf = 0 << CSI_SENS_CONF_SENS_PRTCL_SHIFT;
/* Set generic data, platform-biggest bus-width */
conf |= CSI_SENS_CONF_DATA_FMT_BAYER;
if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_15)
conf |= 3 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_10)
conf |= 2 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_8)
conf |= 1 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
else/* if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_4)*/
conf |= 0 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
if (mx3_cam->platform_flags & MX3_CAMERA_CLK_SRC)
conf |= 1 << CSI_SENS_CONF_SENS_CLKSRC_SHIFT;
if (mx3_cam->platform_flags & MX3_CAMERA_EXT_VSYNC)
conf |= 1 << CSI_SENS_CONF_EXT_VSYNC_SHIFT;
if (mx3_cam->platform_flags & MX3_CAMERA_DP)
conf |= 1 << CSI_SENS_CONF_DATA_POL_SHIFT;
if (mx3_cam->platform_flags & MX3_CAMERA_PCP)
conf |= 1 << CSI_SENS_CONF_PIX_CLK_POL_SHIFT;
if (mx3_cam->platform_flags & MX3_CAMERA_HSP)
conf |= 1 << CSI_SENS_CONF_HSYNC_POL_SHIFT;
if (mx3_cam->platform_flags & MX3_CAMERA_VSP)
conf |= 1 << CSI_SENS_CONF_VSYNC_POL_SHIFT;
/* ipu_csi_init_interface() */
csi_reg_write(mx3_cam, conf, CSI_SENS_CONF);
clk_enable(mx3_cam->clk);
rate = clk_round_rate(mx3_cam->clk, mx3_cam->mclk);
dev_dbg(icd->dev.parent, "Set SENS_CONF to %x, rate %ld\n", conf, rate);
if (rate)
clk_set_rate(mx3_cam->clk, rate);
}
/* Called with .video_lock held */
static int mx3_camera_add_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
if (mx3_cam->icd)
return -EBUSY;
mx3_camera_activate(mx3_cam, icd);
mx3_cam->icd = icd;
dev_info(icd->dev.parent, "MX3 Camera driver attached to camera %d\n",
icd->devnum);
return 0;
}
/* Called with .video_lock held */
static void mx3_camera_remove_device(struct soc_camera_device *icd)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
struct idmac_channel **ichan = &mx3_cam->idmac_channel[0];
BUG_ON(icd != mx3_cam->icd);
if (*ichan) {
dma_release_channel(&(*ichan)->dma_chan);
*ichan = NULL;
}
clk_disable(mx3_cam->clk);
mx3_cam->icd = NULL;
dev_info(icd->dev.parent, "MX3 Camera driver detached from camera %d\n",
icd->devnum);
}
static bool channel_change_requested(struct soc_camera_device *icd,
struct v4l2_rect *rect)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
struct idmac_channel *ichan = mx3_cam->idmac_channel[0];
/* Do buffers have to be re-allocated or channel re-configured? */
return ichan && rect->width * rect->height >
icd->user_width * icd->user_height;
}
static int test_platform_param(struct mx3_camera_dev *mx3_cam,
unsigned char buswidth, unsigned long *flags)
{
/*
* Platform specified synchronization and pixel clock polarities are
* only a recommendation and are only used during probing. MX3x
* camera interface only works in master mode, i.e., uses HSYNC and
* VSYNC signals from the sensor
*/
*flags = SOCAM_MASTER |
SOCAM_HSYNC_ACTIVE_HIGH |
SOCAM_HSYNC_ACTIVE_LOW |
SOCAM_VSYNC_ACTIVE_HIGH |
SOCAM_VSYNC_ACTIVE_LOW |
SOCAM_PCLK_SAMPLE_RISING |
SOCAM_PCLK_SAMPLE_FALLING |
SOCAM_DATA_ACTIVE_HIGH |
SOCAM_DATA_ACTIVE_LOW;
/*
* If requested data width is supported by the platform, use it or any
* possible lower value - i.MX31 is smart enough to schift bits
*/
if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_15)
*flags |= SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_10 |
SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_4;
else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_10)
*flags |= SOCAM_DATAWIDTH_10 | SOCAM_DATAWIDTH_8 |
SOCAM_DATAWIDTH_4;
else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_8)
*flags |= SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_4;
else if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_4)
*flags |= SOCAM_DATAWIDTH_4;
switch (buswidth) {
case 15:
if (!(*flags & SOCAM_DATAWIDTH_15))
return -EINVAL;
break;
case 10:
if (!(*flags & SOCAM_DATAWIDTH_10))
return -EINVAL;
break;
case 8:
if (!(*flags & SOCAM_DATAWIDTH_8))
return -EINVAL;
break;
case 4:
if (!(*flags & SOCAM_DATAWIDTH_4))
return -EINVAL;
break;
default:
dev_warn(mx3_cam->soc_host.v4l2_dev.dev,
"Unsupported bus width %d\n", buswidth);
return -EINVAL;
}
return 0;
}
static int mx3_camera_try_bus_param(struct soc_camera_device *icd,
const unsigned int depth)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
unsigned long bus_flags, camera_flags;
int ret = test_platform_param(mx3_cam, depth, &bus_flags);
dev_dbg(icd->dev.parent, "request bus width %d bit: %d\n", depth, ret);
if (ret < 0)
return ret;
camera_flags = icd->ops->query_bus_param(icd);
ret = soc_camera_bus_param_compatible(camera_flags, bus_flags);
if (ret < 0)
dev_warn(icd->dev.parent,
"Flags incompatible: camera %lx, host %lx\n",
camera_flags, bus_flags);
return ret;
}
static bool chan_filter(struct dma_chan *chan, void *arg)
{
struct dma_chan_request *rq = arg;
struct mx3_camera_pdata *pdata;
if (!rq)
return false;
pdata = rq->mx3_cam->soc_host.v4l2_dev.dev->platform_data;
return rq->id == chan->chan_id &&
pdata->dma_dev == chan->device->dev;
}
static const struct soc_mbus_pixelfmt mx3_camera_formats[] = {
{
.fourcc = V4L2_PIX_FMT_SBGGR8,
.name = "Bayer BGGR (sRGB) 8 bit",
.bits_per_sample = 8,
.packing = SOC_MBUS_PACKING_NONE,
.order = SOC_MBUS_ORDER_LE,
}, {
.fourcc = V4L2_PIX_FMT_GREY,
.name = "Monochrome 8 bit",
.bits_per_sample = 8,
.packing = SOC_MBUS_PACKING_NONE,
.order = SOC_MBUS_ORDER_LE,
},
};
/* This will be corrected as we get more formats */
static bool mx3_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
{
return fmt->packing == SOC_MBUS_PACKING_NONE ||
(fmt->bits_per_sample == 8 &&
fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
(fmt->bits_per_sample > 8 &&
fmt->packing == SOC_MBUS_PACKING_EXTEND16);
}
static int mx3_camera_get_formats(struct soc_camera_device *icd, int idx,
struct soc_camera_format_xlate *xlate)
{
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct device *dev = icd->dev.parent;
int formats = 0, ret;
enum v4l2_mbus_pixelcode code;
const struct soc_mbus_pixelfmt *fmt;
ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
if (ret < 0)
/* No more formats */
return 0;
fmt = soc_mbus_get_fmtdesc(code);
if (!fmt) {
dev_err(icd->dev.parent,
"Invalid format code #%d: %d\n", idx, code);
return 0;
}
/* This also checks support for the requested bits-per-sample */
ret = mx3_camera_try_bus_param(icd, fmt->bits_per_sample);
if (ret < 0)
return 0;
switch (code) {
case V4L2_MBUS_FMT_SBGGR10_1X10:
formats++;
if (xlate) {
xlate->host_fmt = &mx3_camera_formats[0];
xlate->code = code;
xlate++;
dev_dbg(dev, "Providing format %s using code %d\n",
mx3_camera_formats[0].name, code);
}
break;
case V4L2_MBUS_FMT_Y10_1X10:
formats++;
if (xlate) {
xlate->host_fmt = &mx3_camera_formats[1];
xlate->code = code;
xlate++;
dev_dbg(dev, "Providing format %s using code %d\n",
mx3_camera_formats[1].name, code);
}
break;
default:
if (!mx3_camera_packing_supported(fmt))
return 0;
}
/* Generic pass-through */
formats++;
if (xlate) {
xlate->host_fmt = fmt;
xlate->code = code;
xlate++;
dev_dbg(dev, "Providing format %x in pass-through mode\n",
xlate->host_fmt->fourcc);
}
return formats;
}
static void configure_geometry(struct mx3_camera_dev *mx3_cam,
unsigned int width, unsigned int height)
{
u32 ctrl, width_field, height_field;
/* Setup frame size - this cannot be changed on-the-fly... */
width_field = width - 1;
height_field = height - 1;
csi_reg_write(mx3_cam, width_field | (height_field << 16), CSI_SENS_FRM_SIZE);
csi_reg_write(mx3_cam, width_field << 16, CSI_FLASH_STROBE_1);
csi_reg_write(mx3_cam, (height_field << 16) | 0x22, CSI_FLASH_STROBE_2);
csi_reg_write(mx3_cam, width_field | (height_field << 16), CSI_ACT_FRM_SIZE);
/* ...and position */
ctrl = csi_reg_read(mx3_cam, CSI_OUT_FRM_CTRL) & 0xffff0000;
/* Sensor does the cropping */
csi_reg_write(mx3_cam, ctrl | 0 | (0 << 8), CSI_OUT_FRM_CTRL);
}
static int acquire_dma_channel(struct mx3_camera_dev *mx3_cam)
{
dma_cap_mask_t mask;
struct dma_chan *chan;
struct idmac_channel **ichan = &mx3_cam->idmac_channel[0];
/* We have to use IDMAC_IC_7 for Bayer / generic data */
struct dma_chan_request rq = {.mx3_cam = mx3_cam,
.id = IDMAC_IC_7};
if (*ichan) {
struct videobuf_buffer *vb, *_vb;
dma_release_channel(&(*ichan)->dma_chan);
*ichan = NULL;
mx3_cam->active = NULL;
list_for_each_entry_safe(vb, _vb, &mx3_cam->capture, queue) {
list_del_init(&vb->queue);
vb->state = VIDEOBUF_ERROR;
wake_up(&vb->done);
}
}
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
dma_cap_set(DMA_PRIVATE, mask);
chan = dma_request_channel(mask, chan_filter, &rq);
if (!chan)
return -EBUSY;
*ichan = to_idmac_chan(chan);
(*ichan)->client = mx3_cam;
return 0;
}
/*
* FIXME: learn to use stride != width, then we can keep stride properly aligned
* and support arbitrary (even) widths.
*/
static inline void stride_align(__u32 *width)
{
if (((*width + 7) & ~7) < 4096)
*width = (*width + 7) & ~7;
else
*width = *width & ~7;
}
/*
* As long as we don't implement host-side cropping and scaling, we can use
* default g_crop and cropcap from soc_camera.c
*/
static int mx3_camera_set_crop(struct soc_camera_device *icd,
struct v4l2_crop *a)
{
struct v4l2_rect *rect = &a->c;
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
struct v4l2_mbus_framefmt mf;
int ret;
soc_camera_limit_side(&rect->left, &rect->width, 0, 2, 4096);
soc_camera_limit_side(&rect->top, &rect->height, 0, 2, 4096);
ret = v4l2_subdev_call(sd, video, s_crop, a);
if (ret < 0)
return ret;
/* The capture device might have changed its output */
ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
if (ret < 0)
return ret;
if (mf.width & 7) {
/* Ouch! We can only handle 8-byte aligned width... */
stride_align(&mf.width);
ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
if (ret < 0)
return ret;
}
if (mf.width != icd->user_width || mf.height != icd->user_height) {
/*
* We now know pixel formats and can decide upon DMA-channel(s)
* So far only direct camera-to-memory is supported
*/
if (channel_change_requested(icd, rect)) {
ret = acquire_dma_channel(mx3_cam);
if (ret < 0)
return ret;
}
configure_geometry(mx3_cam, mf.width, mf.height);
}
dev_dbg(icd->dev.parent, "Sensor cropped %dx%d\n",
mf.width, mf.height);
icd->user_width = mf.width;
icd->user_height = mf.height;
return ret;
}
static int mx3_camera_set_fmt(struct soc_camera_device *icd,
struct v4l2_format *f)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
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;
xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
if (!xlate) {
dev_warn(icd->dev.parent, "Format %x not found\n",
pix->pixelformat);
return -EINVAL;
}
stride_align(&pix->width);
dev_dbg(icd->dev.parent, "Set format %dx%d\n", pix->width, pix->height);
ret = acquire_dma_channel(mx3_cam);
if (ret < 0)
return ret;
/*
* Might have to perform a complete interface initialisation like in
* ipu_csi_init_interface() in mxc_v4l2_s_param(). Also consider
* mxc_v4l2_s_fmt()
*/
configure_geometry(mx3_cam, pix->width, pix->height);
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;
dev_dbg(icd->dev.parent, "Sensor set %dx%d\n", pix->width, pix->height);
return ret;
}
static int mx3_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;
__u32 pixfmt = pix->pixelformat;
int ret;
xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
if (pixfmt && !xlate) {
dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
return -EINVAL;
}
/* limit to MX3 hardware capabilities */
if (pix->height > 4096)
pix->height = 4096;
if (pix->width > 4096)
pix->width = 4096;
pix->bytesperline = soc_mbus_bytes_per_line(pix->width,
xlate->host_fmt);
if (pix->bytesperline < 0)
return pix->bytesperline;
pix->sizeimage = pix->height * pix->bytesperline;
/* limit to sensor capabilities */
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, try_mbus_fmt, &mf);
if (ret < 0)
return ret;
pix->width = mf.width;
pix->height = mf.height;
pix->colorspace = mf.colorspace;
switch (mf.field) {
case V4L2_FIELD_ANY:
pix->field = V4L2_FIELD_NONE;
break;
case V4L2_FIELD_NONE:
break;
default:
dev_err(icd->dev.parent, "Field type %d unsupported.\n",
mf.field);
ret = -EINVAL;
}
return ret;
}
static int mx3_camera_reqbufs(struct soc_camera_file *icf,
struct v4l2_requestbuffers *p)
{
return 0;
}
static unsigned int mx3_camera_poll(struct file *file, poll_table *pt)
{
struct soc_camera_file *icf = file->private_data;
return videobuf_poll_stream(file, &icf->vb_vidq, pt);
}
static int mx3_camera_querycap(struct soc_camera_host *ici,
struct v4l2_capability *cap)
{
/* cap->name is set by the firendly caller:-> */
strlcpy(cap->card, "i.MX3x Camera", sizeof(cap->card));
cap->version = KERNEL_VERSION(0, 2, 2);
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
return 0;
}
static int mx3_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
{
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
struct mx3_camera_dev *mx3_cam = ici->priv;
unsigned long bus_flags, camera_flags, common_flags;
u32 dw, sens_conf;
const struct soc_mbus_pixelfmt *fmt;
int buswidth;
int ret;
const struct soc_camera_format_xlate *xlate;
struct device *dev = icd->dev.parent;
fmt = soc_mbus_get_fmtdesc(icd->current_fmt->code);
if (!fmt)
return -EINVAL;
buswidth = fmt->bits_per_sample;
ret = test_platform_param(mx3_cam, buswidth, &bus_flags);
xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
if (!xlate) {
dev_warn(dev, "Format %x not found\n", pixfmt);
return -EINVAL;
}
dev_dbg(dev, "requested bus width %d bit: %d\n", buswidth, ret);
if (ret < 0)
return ret;
camera_flags = icd->ops->query_bus_param(icd);
common_flags = soc_camera_bus_param_compatible(camera_flags, bus_flags);
dev_dbg(dev, "Flags cam: 0x%lx host: 0x%lx common: 0x%lx\n",
camera_flags, bus_flags, common_flags);
if (!common_flags) {
dev_dbg(dev, "no common flags");
return -EINVAL;
}
/* Make choices, based on platform preferences */
if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
(common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
if (mx3_cam->platform_flags & MX3_CAMERA_HSP)
common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
else
common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
}
if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
(common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
if (mx3_cam->platform_flags & MX3_CAMERA_VSP)
common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
else
common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
}
if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
(common_flags & SOCAM_DATA_ACTIVE_LOW)) {
if (mx3_cam->platform_flags & MX3_CAMERA_DP)
common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
else
common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
}
if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
(common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
if (mx3_cam->platform_flags & MX3_CAMERA_PCP)
common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
else
common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
}
/*
* Make the camera work in widest common mode, we'll take care of
* the rest
*/
if (common_flags & SOCAM_DATAWIDTH_15)
common_flags = (common_flags & ~SOCAM_DATAWIDTH_MASK) |
SOCAM_DATAWIDTH_15;
else if (common_flags & SOCAM_DATAWIDTH_10)
common_flags = (common_flags & ~SOCAM_DATAWIDTH_MASK) |
SOCAM_DATAWIDTH_10;
else if (common_flags & SOCAM_DATAWIDTH_8)
common_flags = (common_flags & ~SOCAM_DATAWIDTH_MASK) |
SOCAM_DATAWIDTH_8;
else
common_flags = (common_flags & ~SOCAM_DATAWIDTH_MASK) |
SOCAM_DATAWIDTH_4;
ret = icd->ops->set_bus_param(icd, common_flags);
if (ret < 0) {
dev_dbg(dev, "camera set_bus_param(%lx) returned %d\n",
common_flags, ret);
return ret;
}
/*
* So far only gated clock mode is supported. Add a line
* (3 << CSI_SENS_CONF_SENS_PRTCL_SHIFT) |
* below and select the required mode when supporting other
* synchronisation protocols.
*/
sens_conf = csi_reg_read(mx3_cam, CSI_SENS_CONF) &
~((1 << CSI_SENS_CONF_VSYNC_POL_SHIFT) |
(1 << CSI_SENS_CONF_HSYNC_POL_SHIFT) |
(1 << CSI_SENS_CONF_DATA_POL_SHIFT) |
(1 << CSI_SENS_CONF_PIX_CLK_POL_SHIFT) |
(3 << CSI_SENS_CONF_DATA_FMT_SHIFT) |
(3 << CSI_SENS_CONF_DATA_WIDTH_SHIFT));
/* TODO: Support RGB and YUV formats */
/* This has been set in mx3_camera_activate(), but we clear it above */
sens_conf |= CSI_SENS_CONF_DATA_FMT_BAYER;
if (common_flags & SOCAM_PCLK_SAMPLE_FALLING)
sens_conf |= 1 << CSI_SENS_CONF_PIX_CLK_POL_SHIFT;
if (common_flags & SOCAM_HSYNC_ACTIVE_LOW)
sens_conf |= 1 << CSI_SENS_CONF_HSYNC_POL_SHIFT;
if (common_flags & SOCAM_VSYNC_ACTIVE_LOW)
sens_conf |= 1 << CSI_SENS_CONF_VSYNC_POL_SHIFT;
if (common_flags & SOCAM_DATA_ACTIVE_LOW)
sens_conf |= 1 << CSI_SENS_CONF_DATA_POL_SHIFT;
/* Just do what we're asked to do */
switch (xlate->host_fmt->bits_per_sample) {
case 4:
dw = 0 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
break;
case 8:
dw = 1 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
break;
case 10:
dw = 2 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
break;
default:
/*
* Actually it can only be 15 now, default is just to silence
* compiler warnings
*/
case 15:
dw = 3 << CSI_SENS_CONF_DATA_WIDTH_SHIFT;
}
csi_reg_write(mx3_cam, sens_conf | dw, CSI_SENS_CONF);
dev_dbg(dev, "Set SENS_CONF to %x\n", sens_conf | dw);
return 0;
}
static struct soc_camera_host_ops mx3_soc_camera_host_ops = {
.owner = THIS_MODULE,
.add = mx3_camera_add_device,
.remove = mx3_camera_remove_device,
.set_crop = mx3_camera_set_crop,
.set_fmt = mx3_camera_set_fmt,
.try_fmt = mx3_camera_try_fmt,
.get_formats = mx3_camera_get_formats,
.init_videobuf = mx3_camera_init_videobuf,
.reqbufs = mx3_camera_reqbufs,
.poll = mx3_camera_poll,
.querycap = mx3_camera_querycap,
.set_bus_param = mx3_camera_set_bus_param,
};
static int __devinit mx3_camera_probe(struct platform_device *pdev)
{
struct mx3_camera_dev *mx3_cam;
struct resource *res;
void __iomem *base;
int err = 0;
struct soc_camera_host *soc_host;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
err = -ENODEV;
goto egetres;
}
mx3_cam = vmalloc(sizeof(*mx3_cam));
if (!mx3_cam) {
dev_err(&pdev->dev, "Could not allocate mx3 camera object\n");
err = -ENOMEM;
goto ealloc;
}
memset(mx3_cam, 0, sizeof(*mx3_cam));
mx3_cam->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(mx3_cam->clk)) {
err = PTR_ERR(mx3_cam->clk);
goto eclkget;
}
mx3_cam->pdata = pdev->dev.platform_data;
mx3_cam->platform_flags = mx3_cam->pdata->flags;
if (!(mx3_cam->platform_flags & (MX3_CAMERA_DATAWIDTH_4 |
MX3_CAMERA_DATAWIDTH_8 | MX3_CAMERA_DATAWIDTH_10 |
MX3_CAMERA_DATAWIDTH_15))) {
/*
* Platform hasn't set available data widths. This is bad.
* Warn and use a default.
*/
dev_warn(&pdev->dev, "WARNING! Platform hasn't set available "
"data widths, using default 8 bit\n");
mx3_cam->platform_flags |= MX3_CAMERA_DATAWIDTH_8;
}
mx3_cam->mclk = mx3_cam->pdata->mclk_10khz * 10000;
if (!mx3_cam->mclk) {
dev_warn(&pdev->dev,
"mclk_10khz == 0! Please, fix your platform data. "
"Using default 20MHz\n");
mx3_cam->mclk = 20000000;
}
/* list of video-buffers */
INIT_LIST_HEAD(&mx3_cam->capture);
spin_lock_init(&mx3_cam->lock);
base = ioremap(res->start, resource_size(res));
if (!base) {
pr_err("Couldn't map %x@%x\n", resource_size(res), res->start);
err = -ENOMEM;
goto eioremap;
}
mx3_cam->base = base;
soc_host = &mx3_cam->soc_host;
soc_host->drv_name = MX3_CAM_DRV_NAME;
soc_host->ops = &mx3_soc_camera_host_ops;
soc_host->priv = mx3_cam;
soc_host->v4l2_dev.dev = &pdev->dev;
soc_host->nr = pdev->id;
err = soc_camera_host_register(soc_host);
if (err)
goto ecamhostreg;
/* IDMAC interface */
dmaengine_get();
return 0;
ecamhostreg:
iounmap(base);
eioremap:
clk_put(mx3_cam->clk);
eclkget:
vfree(mx3_cam);
ealloc:
egetres:
return err;
}
static int __devexit mx3_camera_remove(struct platform_device *pdev)
{
struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
struct mx3_camera_dev *mx3_cam = container_of(soc_host,
struct mx3_camera_dev, soc_host);
clk_put(mx3_cam->clk);
soc_camera_host_unregister(soc_host);
iounmap(mx3_cam->base);
/*
* The channel has either not been allocated,
* or should have been released
*/
if (WARN_ON(mx3_cam->idmac_channel[0]))
dma_release_channel(&mx3_cam->idmac_channel[0]->dma_chan);
vfree(mx3_cam);
dmaengine_put();
dev_info(&pdev->dev, "i.MX3x Camera driver unloaded\n");
return 0;
}
static struct platform_driver mx3_camera_driver = {
.driver = {
.name = MX3_CAM_DRV_NAME,
},
.probe = mx3_camera_probe,
.remove = __devexit_p(mx3_camera_remove),
};
static int __init mx3_camera_init(void)
{
return platform_driver_register(&mx3_camera_driver);
}
static void __exit mx3_camera_exit(void)
{
platform_driver_unregister(&mx3_camera_driver);
}
module_init(mx3_camera_init);
module_exit(mx3_camera_exit);
MODULE_DESCRIPTION("i.MX3x SoC Camera Host driver");
MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" MX3_CAM_DRV_NAME);
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