--- /dev/null
+/*
+ * 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 <media/v4l2-common.h>
+#include <media/v4l2-dev.h>
+#include <media/videobuf-dma-contig.h>
+#include <media/soc_camera.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;
+ const struct soc_camera_data_format *fmt;
+
+ /* 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 {
+ struct device *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 int mx3_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt);
+
+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, "%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;
+ /*
+ * bits-per-pixel (depth) as specified in camera's pixel format does
+ * not necessarily match what the camera interface writes to RAM, but
+ * it should be good enough for now.
+ */
+ unsigned int bpp = DIV_ROUND_UP(icd->current_fmt->depth, 8);
+
+ if (!mx3_cam->idmac_channel[0])
+ return -EINVAL;
+
+ *size = icd->width * icd->height * bpp;
+
+ 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);
+ /* current_fmt _must_ always be set */
+ size_t new_size = icd->width * icd->height *
+ ((icd->current_fmt->depth + 7) >> 3);
+ int ret;
+
+ /*
+ * I think, in buf_prepare you only have to protect global data,
+ * the actual buffer is yours
+ */
+
+ 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;
+ 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 held */
+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;
+ const struct soc_camera_data_format *data_fmt = icd->current_fmt;
+ dma_cookie_t cookie;
+ unsigned long flags;
+
+ /* This is the configuration of one sg-element */
+ video->out_pixel_fmt = fourcc_to_ipu_pix(data_fmt->fourcc);
+ video->out_width = icd->width;
+ video->out_height = icd->height;
+ video->out_stride = icd->width;
+
+#ifdef DEBUG
+ /* helps to see what DMA actually has written */
+ memset((void *)vb->baddr, 0xaa, vb->bsize);
+#endif
+
+ spin_lock_irqsave(&mx3_cam->lock, flags);
+
+ 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_irqrestore(&mx3_cam->lock, flags);
+
+ cookie = txd->tx_submit(txd);
+ dev_dbg(&icd->dev, "Submitted cookie %d DMA 0x%08x\n", cookie, sg_dma_address(&buf->sg));
+ if (cookie >= 0)
+ return;
+
+ /* Submit error */
+ vb->state = VIDEOBUF_PREPARED;
+
+ spin_lock_irqsave(&mx3_cam->lock, flags);
+
+ list_del_init(&vb->queue);
+
+ if (mx3_cam->active == buf)
+ mx3_cam->active = NULL;
+
+ spin_unlock_irqrestore(&mx3_cam->lock, flags);
+}
+
+/* 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, "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, mx3_cam->dev,
+ &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, "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;
+ int ret;
+
+ if (mx3_cam->icd) {
+ ret = -EBUSY;
+ goto ebusy;
+ }
+
+ mx3_camera_activate(mx3_cam, icd);
+ ret = icd->ops->init(icd);
+ if (ret < 0) {
+ clk_disable(mx3_cam->clk);
+ goto einit;
+ }
+
+ mx3_cam->icd = icd;
+
+einit:
+ebusy:
+ if (!ret)
+ dev_info(&icd->dev, "MX3 Camera driver attached to camera %d\n",
+ icd->devnum);
+
+ return ret;
+}
+
+/* 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;
+ }
+
+ icd->ops->release(icd);
+
+ clk_disable(mx3_cam->clk);
+
+ mx3_cam->icd = NULL;
+
+ dev_info(&icd->dev, "MX3 Camera driver detached from camera %d\n",
+ icd->devnum);
+}
+
+static bool channel_change_requested(struct soc_camera_device *icd,
+ const struct soc_camera_format_xlate *xlate,
+ __u32 pixfmt, 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];
+
+ /* So far only one configuration is supported */
+ return pixfmt || (ichan && rect->width * rect->height >
+ icd->width * icd->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 */
+ switch (buswidth) {
+ case 15:
+ if (!(mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_15))
+ return -EINVAL;
+ *flags |= SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_10 |
+ SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_4;
+ break;
+ case 10:
+ if (!(mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_10))
+ return -EINVAL;
+ *flags |= SOCAM_DATAWIDTH_10 | SOCAM_DATAWIDTH_8 |
+ SOCAM_DATAWIDTH_4;
+ break;
+ case 8:
+ if (!(mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_8))
+ return -EINVAL;
+ *flags |= SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_4;
+ break;
+ case 4:
+ if (!(mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_4))
+ return -EINVAL;
+ *flags |= SOCAM_DATAWIDTH_4;
+ break;
+ default:
+ dev_info(mx3_cam->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(&ici->dev, "requested 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, "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->dev->platform_data;
+
+ return rq->id == chan->chan_id &&
+ pdata->dma_dev == chan->device->dev;
+}
+
+static const struct soc_camera_data_format mx3_camera_formats[] = {
+ {
+ .name = "Bayer (sRGB) 8 bit",
+ .depth = 8,
+ .fourcc = V4L2_PIX_FMT_SBGGR8,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+ }, {
+ .name = "Monochrome 8 bit",
+ .depth = 8,
+ .fourcc = V4L2_PIX_FMT_GREY,
+ .colorspace = V4L2_COLORSPACE_JPEG,
+ },
+};
+
+static bool buswidth_supported(struct soc_camera_host *ici, int depth)
+{
+ struct mx3_camera_dev *mx3_cam = ici->priv;
+
+ switch (depth) {
+ case 4:
+ return !!(mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_4);
+ case 8:
+ return !!(mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_8);
+ case 10:
+ return !!(mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_10);
+ case 15:
+ return !!(mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_15);
+ }
+ return false;
+}
+
+static int mx3_camera_get_formats(struct soc_camera_device *icd, int idx,
+ struct soc_camera_format_xlate *xlate)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ int formats = 0, buswidth, ret;
+
+ buswidth = icd->formats[idx].depth;
+
+ if (!buswidth_supported(ici, buswidth))
+ return 0;
+
+ ret = mx3_camera_try_bus_param(icd, buswidth);
+ if (ret < 0)
+ return 0;
+
+ switch (icd->formats[idx].fourcc) {
+ case V4L2_PIX_FMT_SGRBG10:
+ formats++;
+ if (xlate) {
+ xlate->host_fmt = &mx3_camera_formats[0];
+ xlate->cam_fmt = icd->formats + idx;
+ xlate->buswidth = buswidth;
+ xlate++;
+ dev_dbg(&ici->dev, "Providing format %s using %s\n",
+ mx3_camera_formats[0].name,
+ icd->formats[idx].name);
+ }
+ goto passthrough;
+ case V4L2_PIX_FMT_Y16:
+ formats++;
+ if (xlate) {
+ xlate->host_fmt = &mx3_camera_formats[1];
+ xlate->cam_fmt = icd->formats + idx;
+ xlate->buswidth = buswidth;
+ xlate++;
+ dev_dbg(&ici->dev, "Providing format %s using %s\n",
+ mx3_camera_formats[0].name,
+ icd->formats[idx].name);
+ }
+ default:
+passthrough:
+ /* Generic pass-through */
+ formats++;
+ if (xlate) {
+ xlate->host_fmt = icd->formats + idx;
+ xlate->cam_fmt = icd->formats + idx;
+ xlate->buswidth = buswidth;
+ xlate++;
+ dev_dbg(&ici->dev,
+ "Providing format %s in pass-through mode\n",
+ icd->formats[idx].name);
+ }
+ }
+
+ return formats;
+}
+
+static int mx3_camera_set_fmt(struct soc_camera_device *icd,
+ __u32 pixfmt, struct v4l2_rect *rect)
+{
+ struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+ struct mx3_camera_dev *mx3_cam = ici->priv;
+ const struct soc_camera_format_xlate *xlate;
+ u32 ctrl, width_field, height_field;
+ int ret;
+
+ xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
+ if (pixfmt && !xlate) {
+ dev_warn(&ici->dev, "Format %x not found\n", pixfmt);
+ return -EINVAL;
+ }
+
+ /*
+ * 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, xlate, pixfmt, rect)) {
+ 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;
+ }
+
+ /*
+ * 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()
+ */
+
+ /* Setup frame size - this cannot be changed on-the-fly... */
+ width_field = rect->width - 1;
+ height_field = rect->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);
+
+ /*
+ * No need to free resources here if we fail, we'll see if we need to
+ * do this next time we are called
+ */
+
+ ret = icd->ops->set_fmt(icd, pixfmt ? xlate->cam_fmt->fourcc : 0, rect);
+ if (pixfmt && !ret) {
+ icd->buswidth = xlate->buswidth;
+ icd->current_fmt = xlate->host_fmt;
+ }
+
+ return ret;
+}
+
+static int mx3_camera_try_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;
+ __u32 pixfmt = pix->pixelformat;
+ enum v4l2_field field;
+ int ret;
+
+ xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
+ if (pixfmt && !xlate) {
+ dev_warn(&ici->dev, "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 = pix->width *
+ DIV_ROUND_UP(xlate->host_fmt->depth, 8);
+ pix->sizeimage = pix->height * pix->bytesperline;
+
+ /* camera has to see its format, but the user the original one */
+ pix->pixelformat = xlate->cam_fmt->fourcc;
+ /* limit to sensor capabilities */
+ ret = icd->ops->try_fmt(icd, f);
+ pix->pixelformat = xlate->host_fmt->fourcc;
+
+ field = pix->field;
+
+ if (field == V4L2_FIELD_ANY) {
+ pix->field = V4L2_FIELD_NONE;
+ } else if (field != V4L2_FIELD_NONE) {
+ dev_err(&icd->dev, "Field type %d unsupported.\n", field);
+ return -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;
+ int ret = test_platform_param(mx3_cam, icd->buswidth, &bus_flags);
+ const struct soc_camera_format_xlate *xlate;
+
+ xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
+ if (!xlate) {
+ dev_warn(&ici->dev, "Format %x not found\n", pixfmt);
+ return -EINVAL;
+ }
+
+ dev_dbg(&ici->dev, "requested bus width %d bit: %d\n",
+ icd->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);
+ if (!common_flags) {
+ dev_dbg(&ici->dev, "no common flags: camera %lx, host %lx\n",
+ camera_flags, bus_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)
+ 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->depth) {
+ 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(&ici->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,
+#ifdef CONFIG_PM
+ .suspend = mx3_camera_suspend,
+ .resume = mx3_camera_resume,
+#endif
+ .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 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, "csi_clk");
+ if (IS_ERR(mx3_cam->clk)) {
+ err = PTR_ERR(mx3_cam->clk);
+ goto eclkget;
+ }
+
+ dev_set_drvdata(&pdev->dev, mx3_cam);
+
+ 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, res->end - res->start + 1);
+ if (!base) {
+ err = -ENOMEM;
+ goto eioremap;
+ }
+
+ mx3_cam->base = base;
+ mx3_cam->dev = &pdev->dev;
+
+ 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->dev.parent = &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 mx3_camera_dev *mx3_cam = platform_get_drvdata(pdev);
+
+ clk_put(mx3_cam->clk);
+
+ soc_camera_host_unregister(&mx3_cam->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 = __exit_p(mx3_camera_remove),
+};
+
+
+static int __devinit 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");
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff