diff options
Diffstat (limited to 'drivers/media/video/mx3_camera.c')
| -rw-r--r-- | drivers/media/video/mx3_camera.c | 1183 |
1 files changed, 1183 insertions, 0 deletions
diff --git a/drivers/media/video/mx3_camera.c b/drivers/media/video/mx3_camera.c new file mode 100644 index 000000000000..f525dc48f6ca --- /dev/null +++ b/drivers/media/video/mx3_camera.c @@ -0,0 +1,1183 @@ +/* + * 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"); |