/* * 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 { /* * 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, ici->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, 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->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->soc_host.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->soc_host.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 void configure_geometry(struct mx3_camera_dev *mx3_cam, struct v4l2_rect *rect) { u32 ctrl, width_field, height_field; /* 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 */ } 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; } static int mx3_camera_set_crop(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; /* * 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)) { int ret = acquire_dma_channel(mx3_cam); if (ret < 0) return ret; } configure_geometry(mx3_cam, rect); return icd->ops->set_crop(icd, rect); } 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; const struct soc_camera_format_xlate *xlate; struct v4l2_pix_format *pix = &f->fmt.pix; struct v4l2_rect rect = { .left = icd->x_current, .top = icd->y_current, .width = pix->width, .height = pix->height, }; int ret; xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat); if (!xlate) { dev_warn(ici->dev, "Format %x not found\n", pix->pixelformat); return -EINVAL; } ret = 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, &rect); ret = icd->ops->set_fmt(icd, f); if (!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, .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, res->end - res->start + 1); if (!base) { 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->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");