/* * V4L2 Driver for i.MX3x camera host * * Copyright (C) 2008 * Guennadi Liakhovetski, DENX Software Engineering, * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 vb2_buffer vb; struct list_head queue; /* 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 clk *clk; void __iomem *base; struct mx3_camera_pdata *pdata; unsigned long platform_flags; unsigned long mclk; u16 width_flags; /* max 15 bits */ struct list_head capture; spinlock_t lock; /* Protects video buffer lists */ struct mx3_camera_buffer *active; size_t buf_total; struct vb2_alloc_ctx *alloc_ctx; enum v4l2_field field; int sequence; /* 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); } static struct mx3_camera_buffer *to_mx3_vb(struct vb2_buffer *vb) { return container_of(vb, struct mx3_camera_buffer, vb); } /* 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; 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) { struct vb2_buffer *vb = &mx3_cam->active->vb; struct mx3_camera_buffer *buf = to_mx3_vb(vb); list_del_init(&buf->queue); v4l2_get_timestamp(&vb->v4l2_buf.timestamp); vb->v4l2_buf.field = mx3_cam->field; vb->v4l2_buf.sequence = mx3_cam->sequence++; vb2_buffer_done(vb, VB2_BUF_STATE_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, queue); spin_unlock(&mx3_cam->lock); } /* * Videobuf operations */ /* * Calculate the __buffer__ (not data) size and number of buffers. */ static int mx3_videobuf_setup(struct vb2_queue *vq, const struct v4l2_format *fmt, unsigned int *count, unsigned int *num_planes, unsigned int sizes[], void *alloc_ctxs[]) { struct soc_camera_device *icd = soc_camera_from_vb2q(vq); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct mx3_camera_dev *mx3_cam = ici->priv; if (!mx3_cam->idmac_channel[0]) return -EINVAL; if (fmt) { const struct soc_camera_format_xlate *xlate = soc_camera_xlate_by_fourcc(icd, fmt->fmt.pix.pixelformat); unsigned int bytes_per_line; int ret; if (!xlate) return -EINVAL; ret = soc_mbus_bytes_per_line(fmt->fmt.pix.width, xlate->host_fmt); if (ret < 0) return ret; bytes_per_line = max_t(u32, fmt->fmt.pix.bytesperline, ret); ret = soc_mbus_image_size(xlate->host_fmt, bytes_per_line, fmt->fmt.pix.height); if (ret < 0) return ret; sizes[0] = max_t(u32, fmt->fmt.pix.sizeimage, ret); } else { /* Called from VIDIOC_REQBUFS or in compatibility mode */ sizes[0] = icd->sizeimage; } alloc_ctxs[0] = mx3_cam->alloc_ctx; if (!vq->num_buffers) mx3_cam->sequence = 0; if (!*count) *count = 2; /* If *num_planes != 0, we have already verified *count. */ if (!*num_planes && sizes[0] * *count + mx3_cam->buf_total > MAX_VIDEO_MEM * 1024 * 1024) *count = (MAX_VIDEO_MEM * 1024 * 1024 - mx3_cam->buf_total) / sizes[0]; *num_planes = 1; return 0; } 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_RGB24: return IPU_PIX_FMT_RGB24; case V4L2_PIX_FMT_UYVY: case V4L2_PIX_FMT_RGB565: default: return IPU_PIX_FMT_GENERIC; } } static void mx3_videobuf_queue(struct vb2_buffer *vb) { struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct mx3_camera_dev *mx3_cam = ici->priv; struct mx3_camera_buffer *buf = to_mx3_vb(vb); struct scatterlist *sg = &buf->sg; struct dma_async_tx_descriptor *txd; struct idmac_channel *ichan = mx3_cam->idmac_channel[0]; struct idmac_video_param *video = &ichan->params.video; const struct soc_mbus_pixelfmt *host_fmt = icd->current_fmt->host_fmt; dma_cookie_t cookie; size_t new_size; new_size = icd->sizeimage; if (vb2_plane_size(vb, 0) < new_size) { dev_err(icd->parent, "Buffer #%d too small (%lu < %zu)\n", vb->v4l2_buf.index, vb2_plane_size(vb, 0), new_size); goto error; } if (!buf->txd) { sg_dma_address(sg) = vb2_dma_contig_plane_dma_addr(vb, 0); sg_dma_len(sg) = new_size; txd = dmaengine_prep_slave_sg( &ichan->dma_chan, sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); if (!txd) goto error; txd->callback_param = txd; txd->callback = mx3_cam_dma_done; buf->txd = txd; } else { txd = buf->txd; } vb2_set_plane_payload(vb, 0, new_size); /* This is the configuration of one sg-element */ video->out_pixel_fmt = fourcc_to_ipu_pix(host_fmt->fourcc); if (video->out_pixel_fmt == IPU_PIX_FMT_GENERIC) { /* * If the IPU DMA channel is configured to transfer generic * 8-bit data, we have to set up the geometry parameters * correctly, according to the current pixel format. The DMA * horizontal parameters in this case are expressed in bytes, * not in pixels. */ video->out_width = icd->bytesperline; video->out_height = icd->user_height; video->out_stride = icd->bytesperline; } else { /* * For IPU known formats the pixel unit will be managed * successfully by the IPU code */ 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 */ if (vb2_plane_vaddr(vb, 0)) memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0)); #endif spin_lock_irq(&mx3_cam->lock); list_add_tail(&buf->queue, &mx3_cam->capture); if (!mx3_cam->active) mx3_cam->active = buf; spin_unlock_irq(&mx3_cam->lock); cookie = txd->tx_submit(txd); dev_dbg(icd->parent, "Submitted cookie %d DMA 0x%08x\n", cookie, sg_dma_address(&buf->sg)); if (cookie >= 0) return; spin_lock_irq(&mx3_cam->lock); /* Submit error */ list_del_init(&buf->queue); if (mx3_cam->active == buf) mx3_cam->active = NULL; spin_unlock_irq(&mx3_cam->lock); error: vb2_buffer_done(vb, VB2_BUF_STATE_ERROR); } static void mx3_videobuf_release(struct vb2_buffer *vb) { struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct mx3_camera_dev *mx3_cam = ici->priv; struct mx3_camera_buffer *buf = to_mx3_vb(vb); struct dma_async_tx_descriptor *txd = buf->txd; unsigned long flags; dev_dbg(icd->parent, "Release%s DMA 0x%08x, queue %sempty\n", mx3_cam->active == buf ? " active" : "", sg_dma_address(&buf->sg), list_empty(&buf->queue) ? "" : "not "); spin_lock_irqsave(&mx3_cam->lock, flags); if (mx3_cam->active == buf) mx3_cam->active = NULL; /* Doesn't hurt also if the list is empty */ list_del_init(&buf->queue); if (txd) { buf->txd = NULL; if (mx3_cam->idmac_channel[0]) async_tx_ack(txd); } spin_unlock_irqrestore(&mx3_cam->lock, flags); mx3_cam->buf_total -= vb2_plane_size(vb, 0); } static int mx3_videobuf_init(struct vb2_buffer *vb) { struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct mx3_camera_dev *mx3_cam = ici->priv; struct mx3_camera_buffer *buf = to_mx3_vb(vb); if (!buf->txd) { /* This is for locking debugging only */ INIT_LIST_HEAD(&buf->queue); sg_init_table(&buf->sg, 1); mx3_cam->buf_total += vb2_plane_size(vb, 0); } return 0; } static void mx3_stop_streaming(struct vb2_queue *q) { struct soc_camera_device *icd = soc_camera_from_vb2q(q); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct mx3_camera_dev *mx3_cam = ici->priv; struct idmac_channel *ichan = mx3_cam->idmac_channel[0]; struct mx3_camera_buffer *buf, *tmp; unsigned long flags; if (ichan) dmaengine_pause(&ichan->dma_chan); spin_lock_irqsave(&mx3_cam->lock, flags); mx3_cam->active = NULL; list_for_each_entry_safe(buf, tmp, &mx3_cam->capture, queue) { list_del_init(&buf->queue); vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); } spin_unlock_irqrestore(&mx3_cam->lock, flags); } static struct vb2_ops mx3_videobuf_ops = { .queue_setup = mx3_videobuf_setup, .buf_queue = mx3_videobuf_queue, .buf_cleanup = mx3_videobuf_release, .buf_init = mx3_videobuf_init, .wait_prepare = vb2_ops_wait_prepare, .wait_finish = vb2_ops_wait_finish, .stop_streaming = mx3_stop_streaming, }; static int mx3_camera_init_videobuf(struct vb2_queue *q, struct soc_camera_device *icd) { struct soc_camera_host *ici = to_soc_camera_host(icd->parent); q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; q->io_modes = VB2_MMAP | VB2_USERPTR; q->drv_priv = icd; q->ops = &mx3_videobuf_ops; q->mem_ops = &vb2_dma_contig_memops; q->buf_struct_size = sizeof(struct mx3_camera_buffer); q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; q->lock = &ici->host_lock; return vb2_queue_init(q); } /* First part of ipu_csi_init_interface() */ static void mx3_camera_activate(struct mx3_camera_dev *mx3_cam) { 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_prepare_enable(mx3_cam->clk); rate = clk_round_rate(mx3_cam->clk, mx3_cam->mclk); dev_dbg(mx3_cam->soc_host.v4l2_dev.dev, "Set SENS_CONF to %x, rate %ld\n", conf, rate); if (rate) clk_set_rate(mx3_cam->clk, rate); } static int mx3_camera_add_device(struct soc_camera_device *icd) { dev_info(icd->parent, "MX3 Camera driver attached to camera %d\n", icd->devnum); return 0; } static void mx3_camera_remove_device(struct soc_camera_device *icd) { dev_info(icd->parent, "MX3 Camera driver detached from camera %d\n", icd->devnum); } /* Called with .host_lock held */ static int mx3_camera_clock_start(struct soc_camera_host *ici) { struct mx3_camera_dev *mx3_cam = ici->priv; mx3_camera_activate(mx3_cam); mx3_cam->buf_total = 0; return 0; } /* Called with .host_lock held */ static void mx3_camera_clock_stop(struct soc_camera_host *ici) { struct mx3_camera_dev *mx3_cam = ici->priv; struct idmac_channel **ichan = &mx3_cam->idmac_channel[0]; if (*ichan) { dma_release_channel(&(*ichan)->dma_chan); *ichan = NULL; } clk_disable_unprepare(mx3_cam->clk); } static int test_platform_param(struct mx3_camera_dev *mx3_cam, unsigned char buswidth, unsigned long *flags) { /* * If requested data width is supported by the platform, use it or any * possible lower value - i.MX31 is smart enough to shift bits */ if (buswidth > fls(mx3_cam->width_flags)) return -EINVAL; /* * 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 = V4L2_MBUS_MASTER | V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW | V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW | V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING | V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_LOW; return 0; } static int mx3_camera_try_bus_param(struct soc_camera_device *icd, const unsigned int depth) { struct v4l2_subdev *sd = soc_camera_to_subdev(icd); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct mx3_camera_dev *mx3_cam = ici->priv; struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; unsigned long bus_flags, common_flags; int ret = test_platform_param(mx3_cam, depth, &bus_flags); dev_dbg(icd->parent, "request bus width %d bit: %d\n", depth, ret); if (ret < 0) return ret; ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); if (!ret) { common_flags = soc_mbus_config_compatible(&cfg, bus_flags); if (!common_flags) { dev_warn(icd->parent, "Flags incompatible: camera 0x%x, host 0x%lx\n", cfg.flags, bus_flags); return -EINVAL; } } else if (ret != -ENOIOCTLCMD) { return ret; } return 0; } static bool chan_filter(struct dma_chan *chan, void *arg) { struct dma_chan_request *rq = arg; struct mx3_camera_pdata *pdata; if (!imx_dma_is_ipu(chan)) return false; 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, .layout = SOC_MBUS_LAYOUT_PACKED, }, { .fourcc = V4L2_PIX_FMT_GREY, .name = "Monochrome 8 bit", .bits_per_sample = 8, .packing = SOC_MBUS_PACKING_NONE, .order = SOC_MBUS_ORDER_LE, .layout = SOC_MBUS_LAYOUT_PACKED, }, }; /* 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, unsigned int idx, struct soc_camera_format_xlate *xlate) { struct v4l2_subdev *sd = soc_camera_to_subdev(icd); struct device *dev = icd->parent; int formats = 0, ret; struct v4l2_subdev_mbus_code_enum code = { .which = V4L2_SUBDEV_FORMAT_ACTIVE, .index = idx, }; const struct soc_mbus_pixelfmt *fmt; ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code); if (ret < 0) /* No more formats */ return 0; fmt = soc_mbus_get_fmtdesc(code.code); if (!fmt) { dev_warn(icd->parent, "Unsupported format code #%u: 0x%x\n", idx, code.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.code) { case MEDIA_BUS_FMT_SBGGR10_1X10: formats++; if (xlate) { xlate->host_fmt = &mx3_camera_formats[0]; xlate->code = code.code; xlate++; dev_dbg(dev, "Providing format %s using code 0x%x\n", mx3_camera_formats[0].name, code.code); } break; case MEDIA_BUS_FMT_Y10_1X10: formats++; if (xlate) { xlate->host_fmt = &mx3_camera_formats[1]; xlate->code = code.code; xlate++; dev_dbg(dev, "Providing format %s using code 0x%x\n", mx3_camera_formats[1].name, code.code); } break; default: if (!mx3_camera_packing_supported(fmt)) return 0; } /* Generic pass-through */ formats++; if (xlate) { xlate->host_fmt = fmt; xlate->code = code.code; dev_dbg(dev, "Providing format %c%c%c%c in pass-through mode\n", (fmt->fourcc >> (0*8)) & 0xFF, (fmt->fourcc >> (1*8)) & 0xFF, (fmt->fourcc >> (2*8)) & 0xFF, (fmt->fourcc >> (3*8)) & 0xFF); xlate++; } return formats; } static void configure_geometry(struct mx3_camera_dev *mx3_cam, unsigned int width, unsigned int height, const struct soc_mbus_pixelfmt *fmt) { u32 ctrl, width_field, height_field; if (fourcc_to_ipu_pix(fmt->fourcc) == IPU_PIX_FMT_GENERIC) { /* * As the CSI will be configured to output BAYER, here * the width parameter count the number of samples to * capture to complete the whole image width. */ unsigned int num, den; int ret = soc_mbus_samples_per_pixel(fmt, &num, &den); BUG_ON(ret < 0); width = width * num / den; } /* 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}; 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 (ALIGN(*width, 8) < 4096) *width = ALIGN(*width, 8); 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, const struct v4l2_crop *a) { struct v4l2_crop a_writable = *a; struct v4l2_rect *rect = &a_writable.c; struct soc_camera_host *ici = to_soc_camera_host(icd->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 sizes */ ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf); if (ret < 0) return ret; if (mf.code != icd->current_fmt->code) return -EINVAL; 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) configure_geometry(mx3_cam, mf.width, mf.height, icd->current_fmt->host_fmt); dev_dbg(icd->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->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->parent, "Format %x not found\n", pix->pixelformat); return -EINVAL; } stride_align(&pix->width); dev_dbg(icd->parent, "Set format %dx%d\n", pix->width, pix->height); /* * 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, xlate->host_fmt); 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; if (!mx3_cam->idmac_channel[0]) { ret = acquire_dma_channel(mx3_cam); if (ret < 0) return ret; } pix->width = mf.width; pix->height = mf.height; pix->field = mf.field; mx3_cam->field = mf.field; pix->colorspace = mf.colorspace; icd->current_fmt = xlate; dev_dbg(icd->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->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; /* 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->parent, "Field type %d unsupported.\n", mf.field); ret = -EINVAL; } return ret; } static int mx3_camera_reqbufs(struct soc_camera_device *icd, struct v4l2_requestbuffers *p) { return 0; } static unsigned int mx3_camera_poll(struct file *file, poll_table *pt) { struct soc_camera_device *icd = file->private_data; return vb2_poll(&icd->vb2_vidq, file, 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->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; return 0; } static int mx3_camera_set_bus_param(struct soc_camera_device *icd) { struct v4l2_subdev *sd = soc_camera_to_subdev(icd); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct mx3_camera_dev *mx3_cam = ici->priv; struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; u32 pixfmt = icd->current_fmt->host_fmt->fourcc; unsigned long bus_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->parent; fmt = soc_mbus_get_fmtdesc(icd->current_fmt->code); if (!fmt) return -EINVAL; xlate = soc_camera_xlate_by_fourcc(icd, pixfmt); if (!xlate) { dev_warn(dev, "Format %x not found\n", pixfmt); return -EINVAL; } buswidth = fmt->bits_per_sample; ret = test_platform_param(mx3_cam, buswidth, &bus_flags); dev_dbg(dev, "requested bus width %d bit: %d\n", buswidth, ret); if (ret < 0) return ret; ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); if (!ret) { common_flags = soc_mbus_config_compatible(&cfg, bus_flags); if (!common_flags) { dev_warn(icd->parent, "Flags incompatible: camera 0x%x, host 0x%lx\n", cfg.flags, bus_flags); return -EINVAL; } } else if (ret != -ENOIOCTLCMD) { return ret; } else { common_flags = bus_flags; } dev_dbg(dev, "Flags cam: 0x%x host: 0x%lx common: 0x%lx\n", cfg.flags, bus_flags, common_flags); /* Make choices, based on platform preferences */ if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) && (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) { if (mx3_cam->platform_flags & MX3_CAMERA_HSP) common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH; else common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW; } if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) && (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) { if (mx3_cam->platform_flags & MX3_CAMERA_VSP) common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH; else common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW; } if ((common_flags & V4L2_MBUS_DATA_ACTIVE_HIGH) && (common_flags & V4L2_MBUS_DATA_ACTIVE_LOW)) { if (mx3_cam->platform_flags & MX3_CAMERA_DP) common_flags &= ~V4L2_MBUS_DATA_ACTIVE_HIGH; else common_flags &= ~V4L2_MBUS_DATA_ACTIVE_LOW; } if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) && (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) { if (mx3_cam->platform_flags & MX3_CAMERA_PCP) common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING; else common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING; } cfg.flags = common_flags; ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg); if (ret < 0 && ret != -ENOIOCTLCMD) { dev_dbg(dev, "camera s_mbus_config(0x%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 & V4L2_MBUS_PCLK_SAMPLE_FALLING) sens_conf |= 1 << CSI_SENS_CONF_PIX_CLK_POL_SHIFT; if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW) sens_conf |= 1 << CSI_SENS_CONF_HSYNC_POL_SHIFT; if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW) sens_conf |= 1 << CSI_SENS_CONF_VSYNC_POL_SHIFT; if (common_flags & V4L2_MBUS_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, .clock_start = mx3_camera_clock_start, .clock_stop = mx3_camera_clock_stop, .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_videobuf2 = 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_pdata *pdata = pdev->dev.platform_data; 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); base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(base)) return PTR_ERR(base); if (!pdata) return -EINVAL; mx3_cam = devm_kzalloc(&pdev->dev, sizeof(*mx3_cam), GFP_KERNEL); if (!mx3_cam) { dev_err(&pdev->dev, "Could not allocate mx3 camera object\n"); return -ENOMEM; } mx3_cam->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(mx3_cam->clk)) return PTR_ERR(mx3_cam->clk); mx3_cam->pdata = pdata; mx3_cam->platform_flags = pdata->flags; if (!(mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_MASK)) { /* * 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; } if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_4) mx3_cam->width_flags = 1 << 3; if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_8) mx3_cam->width_flags |= 1 << 7; if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_10) mx3_cam->width_flags |= 1 << 9; if (mx3_cam->platform_flags & MX3_CAMERA_DATAWIDTH_15) mx3_cam->width_flags |= 1 << 14; mx3_cam->mclk = 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); 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; mx3_cam->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev); if (IS_ERR(mx3_cam->alloc_ctx)) return PTR_ERR(mx3_cam->alloc_ctx); if (pdata->asd_sizes) { soc_host->asd = pdata->asd; soc_host->asd_sizes = pdata->asd_sizes; } err = soc_camera_host_register(soc_host); if (err) goto ecamhostreg; /* IDMAC interface */ dmaengine_get(); return 0; ecamhostreg: vb2_dma_contig_cleanup_ctx(mx3_cam->alloc_ctx); return err; } static int 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); soc_camera_host_unregister(soc_host); /* * 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); vb2_dma_contig_cleanup_ctx(mx3_cam->alloc_ctx); dmaengine_put(); return 0; } static struct platform_driver mx3_camera_driver = { .driver = { .name = MX3_CAM_DRV_NAME, }, .probe = mx3_camera_probe, .remove = mx3_camera_remove, }; module_platform_driver(mx3_camera_driver); MODULE_DESCRIPTION("i.MX3x SoC Camera Host driver"); MODULE_AUTHOR("Guennadi Liakhovetski "); MODULE_LICENSE("GPL v2"); MODULE_VERSION("0.2.3"); MODULE_ALIAS("platform:" MX3_CAM_DRV_NAME);