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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/clk.h> #include <linux/completion.h> #include <linux/delay.h> #include <linux/fs.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <media/atmel-isi.h> #include <media/soc_camera.h> #include <media/soc_mediabus.h> #include <media/videobuf2-dma-contig.h> #define MAX_BUFFER_NUM 32 #define MAX_SUPPORT_WIDTH 2048 #define MAX_SUPPORT_HEIGHT 2048 #define VID_LIMIT_BYTES (16 * 1024 * 1024) #define MIN_FRAME_RATE 15 #define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE) /* ISI states */ enum { ISI_STATE_IDLE = 0, ISI_STATE_READY, ISI_STATE_WAIT_SOF, }; /* Frame buffer descriptor */ struct fbd { /* Physical address of the frame buffer */ u32 fb_address; /* DMA Control Register(only in HISI2) */ u32 dma_ctrl; /* Physical address of the next fbd */ u32 next_fbd_address; }; static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl) { fb_desc->dma_ctrl = ctrl; } struct isi_dma_desc { struct list_head list; struct fbd *p_fbd; u32 fbd_phys; }; /* Frame buffer data */ struct frame_buffer { struct vb2_buffer vb; struct isi_dma_desc *p_dma_desc; struct list_head list; }; struct atmel_isi { /* Protects the access of variables shared with the ISR */ spinlock_t lock; void __iomem *regs; int sequence; /* State of the ISI module in capturing mode */ int state; /* Wait queue for waiting for SOF */ wait_queue_head_t vsync_wq; struct vb2_alloc_ctx *alloc_ctx; /* Allocate descriptors for dma buffer use */ struct fbd *p_fb_descriptors; u32 fb_descriptors_phys; struct list_head dma_desc_head; struct isi_dma_desc dma_desc[MAX_BUFFER_NUM]; struct completion complete; /* ISI peripherial clock */ struct clk *pclk; /* ISI_MCK, feed to camera sensor to generate pixel clock */ struct clk *mck; unsigned int irq; struct isi_platform_data *pdata; u16 width_flags; /* max 12 bits */ struct list_head video_buffer_list; struct frame_buffer *active; struct soc_camera_device *icd; struct soc_camera_host soc_host; }; static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val) { writel(val, isi->regs + reg); } static u32 isi_readl(struct atmel_isi *isi, u32 reg) { return readl(isi->regs + reg); } static int configure_geometry(struct atmel_isi *isi, u32 width, u32 height, enum v4l2_mbus_pixelcode code) { u32 cfg2, cr; switch (code) { /* YUV, including grey */ case V4L2_MBUS_FMT_Y8_1X8: cr = ISI_CFG2_GRAYSCALE; break; case V4L2_MBUS_FMT_UYVY8_2X8: cr = ISI_CFG2_YCC_SWAP_MODE_3; break; case V4L2_MBUS_FMT_VYUY8_2X8: cr = ISI_CFG2_YCC_SWAP_MODE_2; break; case V4L2_MBUS_FMT_YUYV8_2X8: cr = ISI_CFG2_YCC_SWAP_MODE_1; break; case V4L2_MBUS_FMT_YVYU8_2X8: cr = ISI_CFG2_YCC_SWAP_DEFAULT; break; /* RGB, TODO */ default: return -EINVAL; } isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); cfg2 = isi_readl(isi, ISI_CFG2); cfg2 |= cr; /* Set width */ cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK); cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) & ISI_CFG2_IM_HSIZE_MASK; /* Set height */ cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK); cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET) & ISI_CFG2_IM_VSIZE_MASK; isi_writel(isi, ISI_CFG2, cfg2); return 0; } static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi) { if (isi->active) { struct vb2_buffer *vb = &isi->active->vb; struct frame_buffer *buf = isi->active; list_del_init(&buf->list); v4l2_get_timestamp(&vb->v4l2_buf.timestamp); vb->v4l2_buf.sequence = isi->sequence++; vb2_buffer_done(vb, VB2_BUF_STATE_DONE); } if (list_empty(&isi->video_buffer_list)) { isi->active = NULL; } else { /* start next dma frame. */ isi->active = list_entry(isi->video_buffer_list.next, struct frame_buffer, list); isi_writel(isi, ISI_DMA_C_DSCR, isi->active->p_dma_desc->fbd_phys); isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE); isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH); } return IRQ_HANDLED; } /* ISI interrupt service routine */ static irqreturn_t isi_interrupt(int irq, void *dev_id) { struct atmel_isi *isi = dev_id; u32 status, mask, pending; irqreturn_t ret = IRQ_NONE; spin_lock(&isi->lock); status = isi_readl(isi, ISI_STATUS); mask = isi_readl(isi, ISI_INTMASK); pending = status & mask; if (pending & ISI_CTRL_SRST) { complete(&isi->complete); isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST); ret = IRQ_HANDLED; } else if (pending & ISI_CTRL_DIS) { complete(&isi->complete); isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS); ret = IRQ_HANDLED; } else { if ((pending & ISI_SR_VSYNC) && (isi->state == ISI_STATE_IDLE)) { isi->state = ISI_STATE_READY; wake_up_interruptible(&isi->vsync_wq); ret = IRQ_HANDLED; } if (likely(pending & ISI_SR_CXFR_DONE)) ret = atmel_isi_handle_streaming(isi); } spin_unlock(&isi->lock); return ret; } #define WAIT_ISI_RESET 1 #define WAIT_ISI_DISABLE 0 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset) { unsigned long timeout; /* * The reset or disable will only succeed if we have a * pixel clock from the camera. */ init_completion(&isi->complete); if (wait_reset) { isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST); isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST); } else { isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS); isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); } timeout = wait_for_completion_timeout(&isi->complete, msecs_to_jiffies(100)); if (timeout == 0) return -ETIMEDOUT; return 0; } /* ------------------------------------------------------------------ Videobuf operations ------------------------------------------------------------------*/ static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt, unsigned int *nbuffers, unsigned int *nplanes, 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 atmel_isi *isi = ici->priv; unsigned long size; int ret; /* Reset ISI */ ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET); if (ret < 0) { dev_err(icd->parent, "Reset ISI timed out\n"); return ret; } /* Disable all interrupts */ isi_writel(isi, ISI_INTDIS, ~0UL); size = icd->sizeimage; if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM) *nbuffers = MAX_BUFFER_NUM; if (size * *nbuffers > VID_LIMIT_BYTES) *nbuffers = VID_LIMIT_BYTES / size; *nplanes = 1; sizes[0] = size; alloc_ctxs[0] = isi->alloc_ctx; isi->sequence = 0; isi->active = NULL; dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__, *nbuffers, size); return 0; } static int buffer_init(struct vb2_buffer *vb) { struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); buf->p_dma_desc = NULL; INIT_LIST_HEAD(&buf->list); return 0; } static int buffer_prepare(struct vb2_buffer *vb) { struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue); struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct atmel_isi *isi = ici->priv; unsigned long size; struct isi_dma_desc *desc; size = icd->sizeimage; if (vb2_plane_size(vb, 0) < size) { dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n", __func__, vb2_plane_size(vb, 0), size); return -EINVAL; } vb2_set_plane_payload(&buf->vb, 0, size); if (!buf->p_dma_desc) { if (list_empty(&isi->dma_desc_head)) { dev_err(icd->parent, "Not enough dma descriptors.\n"); return -EINVAL; } else { /* Get an available descriptor */ desc = list_entry(isi->dma_desc_head.next, struct isi_dma_desc, list); /* Delete the descriptor since now it is used */ list_del_init(&desc->list); /* Initialize the dma descriptor */ desc->p_fbd->fb_address = vb2_dma_contig_plane_dma_addr(vb, 0); desc->p_fbd->next_fbd_address = 0; set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB); buf->p_dma_desc = desc; } } return 0; } static void buffer_cleanup(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 atmel_isi *isi = ici->priv; struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); /* This descriptor is available now and we add to head list */ if (buf->p_dma_desc) list_add(&buf->p_dma_desc->list, &isi->dma_desc_head); } static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer) { u32 ctrl, cfg1; cfg1 = isi_readl(isi, ISI_CFG1); /* Enable irq: cxfr for the codec path, pxfr for the preview path */ isi_writel(isi, ISI_INTEN, ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE); /* Check if already in a frame */ if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) { dev_err(isi->icd->parent, "Already in frame handling.\n"); return; } isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys); isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE); isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH); /* Enable linked list */ cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR; /* Enable codec path and ISI */ ctrl = ISI_CTRL_CDC | ISI_CTRL_EN; isi_writel(isi, ISI_CTRL, ctrl); isi_writel(isi, ISI_CFG1, cfg1); } static void buffer_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 atmel_isi *isi = ici->priv; struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb); unsigned long flags = 0; spin_lock_irqsave(&isi->lock, flags); list_add_tail(&buf->list, &isi->video_buffer_list); if (isi->active == NULL) { isi->active = buf; if (vb2_is_streaming(vb->vb2_queue)) start_dma(isi, buf); } spin_unlock_irqrestore(&isi->lock, flags); } static int start_streaming(struct vb2_queue *vq, unsigned int count) { struct soc_camera_device *icd = soc_camera_from_vb2q(vq); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct atmel_isi *isi = ici->priv; u32 sr = 0; int ret; spin_lock_irq(&isi->lock); isi->state = ISI_STATE_IDLE; /* Clear any pending SOF interrupt */ sr = isi_readl(isi, ISI_STATUS); /* Enable VSYNC interrupt for SOF */ isi_writel(isi, ISI_INTEN, ISI_SR_VSYNC); isi_writel(isi, ISI_CTRL, ISI_CTRL_EN); spin_unlock_irq(&isi->lock); dev_dbg(icd->parent, "Waiting for SOF\n"); ret = wait_event_interruptible(isi->vsync_wq, isi->state != ISI_STATE_IDLE); if (ret) goto err; if (isi->state != ISI_STATE_READY) { ret = -EIO; goto err; } spin_lock_irq(&isi->lock); isi->state = ISI_STATE_WAIT_SOF; isi_writel(isi, ISI_INTDIS, ISI_SR_VSYNC); if (count) start_dma(isi, isi->active); spin_unlock_irq(&isi->lock); return 0; err: isi->active = NULL; isi->sequence = 0; INIT_LIST_HEAD(&isi->video_buffer_list); return ret; } /* abort streaming and wait for last buffer */ static int stop_streaming(struct vb2_queue *vq) { struct soc_camera_device *icd = soc_camera_from_vb2q(vq); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct atmel_isi *isi = ici->priv; struct frame_buffer *buf, *node; int ret = 0; unsigned long timeout; spin_lock_irq(&isi->lock); isi->active = NULL; /* Release all active buffers */ list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) { list_del_init(&buf->list); vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); } spin_unlock_irq(&isi->lock); timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ; /* Wait until the end of the current frame. */ while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) && time_before(jiffies, timeout)) msleep(1); if (time_after(jiffies, timeout)) { dev_err(icd->parent, "Timeout waiting for finishing codec request\n"); return -ETIMEDOUT; } /* Disable interrupts */ isi_writel(isi, ISI_INTDIS, ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE); /* Disable ISI and wait for it is done */ ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE); if (ret < 0) dev_err(icd->parent, "Disable ISI timed out\n"); return ret; } static struct vb2_ops isi_video_qops = { .queue_setup = queue_setup, .buf_init = buffer_init, .buf_prepare = buffer_prepare, .buf_cleanup = buffer_cleanup, .buf_queue = buffer_queue, .start_streaming = start_streaming, .stop_streaming = stop_streaming, .wait_prepare = soc_camera_unlock, .wait_finish = soc_camera_lock, }; /* ------------------------------------------------------------------ SOC camera operations for the device ------------------------------------------------------------------*/ static int isi_camera_init_videobuf(struct vb2_queue *q, struct soc_camera_device *icd) { q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; q->io_modes = VB2_MMAP; q->drv_priv = icd; q->buf_struct_size = sizeof(struct frame_buffer); q->ops = &isi_video_qops; q->mem_ops = &vb2_dma_contig_memops; q->timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; return vb2_queue_init(q); } static int isi_camera_set_fmt(struct soc_camera_device *icd, struct v4l2_format *f) { struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct atmel_isi *isi = 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; } dev_dbg(icd->parent, "Plan to set format %dx%d\n", pix->width, pix->height); mf.width = pix->width; mf.height = pix->height; mf.field = pix->field; mf.colorspace = pix->colorspace; mf.code = xlate->code; ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf); if (ret < 0) return ret; if (mf.code != xlate->code) return -EINVAL; ret = configure_geometry(isi, pix->width, pix->height, xlate->code); if (ret < 0) return ret; pix->width = mf.width; pix->height = mf.height; pix->field = mf.field; pix->colorspace = mf.colorspace; icd->current_fmt = xlate; dev_dbg(icd->parent, "Finally set format %dx%d\n", pix->width, pix->height); return ret; } static int isi_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 Atmel ISI hardware capabilities */ if (pix->height > MAX_SUPPORT_HEIGHT) pix->height = MAX_SUPPORT_HEIGHT; if (pix->width > MAX_SUPPORT_WIDTH) pix->width = MAX_SUPPORT_WIDTH; /* 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 const struct soc_mbus_pixelfmt isi_camera_formats[] = { { .fourcc = V4L2_PIX_FMT_YUYV, .name = "Packed YUV422 16 bit", .bits_per_sample = 8, .packing = SOC_MBUS_PACKING_2X8_PADHI, .order = SOC_MBUS_ORDER_LE, .layout = SOC_MBUS_LAYOUT_PACKED, }, }; /* This will be corrected as we get more formats */ static bool isi_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); } #define ISI_BUS_PARAM (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) static int isi_camera_try_bus_param(struct soc_camera_device *icd, unsigned char buswidth) { struct v4l2_subdev *sd = soc_camera_to_subdev(icd); struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct atmel_isi *isi = ici->priv; struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; unsigned long common_flags; int ret; ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); if (!ret) { common_flags = soc_mbus_config_compatible(&cfg, ISI_BUS_PARAM); if (!common_flags) { dev_warn(icd->parent, "Flags incompatible: camera 0x%x, host 0x%x\n", cfg.flags, ISI_BUS_PARAM); return -EINVAL; } } else if (ret != -ENOIOCTLCMD) { return ret; } if ((1 << (buswidth - 1)) & isi->width_flags) return 0; return -EINVAL; } static int isi_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); int formats = 0, ret; /* sensor format */ enum v4l2_mbus_pixelcode code; /* soc camera host format */ const struct soc_mbus_pixelfmt *fmt; ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code); if (ret < 0) /* No more formats */ return 0; fmt = soc_mbus_get_fmtdesc(code); if (!fmt) { dev_err(icd->parent, "Invalid format code #%u: %d\n", idx, code); return 0; } /* This also checks support for the requested bits-per-sample */ ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample); if (ret < 0) { dev_err(icd->parent, "Fail to try the bus parameters.\n"); return 0; } switch (code) { case V4L2_MBUS_FMT_UYVY8_2X8: case V4L2_MBUS_FMT_VYUY8_2X8: case V4L2_MBUS_FMT_YUYV8_2X8: case V4L2_MBUS_FMT_YVYU8_2X8: formats++; if (xlate) { xlate->host_fmt = &isi_camera_formats[0]; xlate->code = code; xlate++; dev_dbg(icd->parent, "Providing format %s using code %d\n", isi_camera_formats[0].name, code); } break; default: if (!isi_camera_packing_supported(fmt)) return 0; if (xlate) dev_dbg(icd->parent, "Providing format %s in pass-through mode\n", fmt->name); } /* Generic pass-through */ formats++; if (xlate) { xlate->host_fmt = fmt; xlate->code = code; xlate++; } return formats; } /* Called with .host_lock held */ static int isi_camera_add_device(struct soc_camera_device *icd) { struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct atmel_isi *isi = ici->priv; int ret; if (isi->icd) return -EBUSY; ret = clk_enable(isi->pclk); if (ret) return ret; ret = clk_enable(isi->mck); if (ret) { clk_disable(isi->pclk); return ret; } isi->icd = icd; dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n", icd->devnum); return 0; } /* Called with .host_lock held */ static void isi_camera_remove_device(struct soc_camera_device *icd) { struct soc_camera_host *ici = to_soc_camera_host(icd->parent); struct atmel_isi *isi = ici->priv; BUG_ON(icd != isi->icd); clk_disable(isi->mck); clk_disable(isi->pclk); isi->icd = NULL; dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n", icd->devnum); } static unsigned int isi_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 isi_camera_querycap(struct soc_camera_host *ici, struct v4l2_capability *cap) { strcpy(cap->driver, "atmel-isi"); strcpy(cap->card, "Atmel Image Sensor Interface"); cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING); return 0; } static int isi_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 atmel_isi *isi = ici->priv; struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,}; unsigned long common_flags; int ret; u32 cfg1 = 0; ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg); if (!ret) { common_flags = soc_mbus_config_compatible(&cfg, ISI_BUS_PARAM); if (!common_flags) { dev_warn(icd->parent, "Flags incompatible: camera 0x%x, host 0x%x\n", cfg.flags, ISI_BUS_PARAM); return -EINVAL; } } else if (ret != -ENOIOCTLCMD) { return ret; } else { common_flags = ISI_BUS_PARAM; } dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n", cfg.flags, ISI_BUS_PARAM, common_flags); /* Make choises, based on platform preferences */ if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) && (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) { if (isi->pdata->hsync_act_low) 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 (isi->pdata->vsync_act_low) common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH; else common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW; } if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) && (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) { if (isi->pdata->pclk_act_falling) 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(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n", common_flags, ret); return ret; } /* set bus param for ISI */ if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW) cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW; if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW) cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW; if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING) cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING; if (isi->pdata->has_emb_sync) cfg1 |= ISI_CFG1_EMB_SYNC; if (isi->pdata->full_mode) cfg1 |= ISI_CFG1_FULL_MODE; isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); isi_writel(isi, ISI_CFG1, cfg1); return 0; } static struct soc_camera_host_ops isi_soc_camera_host_ops = { .owner = THIS_MODULE, .add = isi_camera_add_device, .remove = isi_camera_remove_device, .set_fmt = isi_camera_set_fmt, .try_fmt = isi_camera_try_fmt, .get_formats = isi_camera_get_formats, .init_videobuf2 = isi_camera_init_videobuf, .poll = isi_camera_poll, .querycap = isi_camera_querycap, .set_bus_param = isi_camera_set_bus_param, }; /* -----------------------------------------------------------------------*/ static int atmel_isi_remove(struct platform_device *pdev) { struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev); struct atmel_isi *isi = container_of(soc_host, struct atmel_isi, soc_host); free_irq(isi->irq, isi); soc_camera_host_unregister(soc_host); vb2_dma_contig_cleanup_ctx(isi->alloc_ctx); dma_free_coherent(&pdev->dev, sizeof(struct fbd) * MAX_BUFFER_NUM, isi->p_fb_descriptors, isi->fb_descriptors_phys); iounmap(isi->regs); clk_unprepare(isi->mck); clk_put(isi->mck); clk_unprepare(isi->pclk); clk_put(isi->pclk); kfree(isi); return 0; } static int atmel_isi_probe(struct platform_device *pdev) { unsigned int irq; struct atmel_isi *isi; struct clk *pclk; struct resource *regs; int ret, i; struct device *dev = &pdev->dev; struct soc_camera_host *soc_host; struct isi_platform_data *pdata; pdata = dev->platform_data; if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) { dev_err(&pdev->dev, "No config available for Atmel ISI\n"); return -EINVAL; } regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!regs) return -ENXIO; pclk = clk_get(&pdev->dev, "isi_clk"); if (IS_ERR(pclk)) return PTR_ERR(pclk); ret = clk_prepare(pclk); if (ret) goto err_clk_prepare_pclk; isi = kzalloc(sizeof(struct atmel_isi), GFP_KERNEL); if (!isi) { ret = -ENOMEM; dev_err(&pdev->dev, "Can't allocate interface!\n"); goto err_alloc_isi; } isi->pclk = pclk; isi->pdata = pdata; isi->active = NULL; spin_lock_init(&isi->lock); init_waitqueue_head(&isi->vsync_wq); INIT_LIST_HEAD(&isi->video_buffer_list); INIT_LIST_HEAD(&isi->dma_desc_head); /* Get ISI_MCK, provided by programmable clock or external clock */ isi->mck = clk_get(dev, "isi_mck"); if (IS_ERR(isi->mck)) { dev_err(dev, "Failed to get isi_mck\n"); ret = PTR_ERR(isi->mck); goto err_clk_get; } ret = clk_prepare(isi->mck); if (ret) goto err_clk_prepare_mck; /* Set ISI_MCK's frequency, it should be faster than pixel clock */ ret = clk_set_rate(isi->mck, pdata->mck_hz); if (ret < 0) goto err_set_mck_rate; isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev, sizeof(struct fbd) * MAX_BUFFER_NUM, &isi->fb_descriptors_phys, GFP_KERNEL); if (!isi->p_fb_descriptors) { ret = -ENOMEM; dev_err(&pdev->dev, "Can't allocate descriptors!\n"); goto err_alloc_descriptors; } for (i = 0; i < MAX_BUFFER_NUM; i++) { isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i; isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys + i * sizeof(struct fbd); list_add(&isi->dma_desc[i].list, &isi->dma_desc_head); } isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev); if (IS_ERR(isi->alloc_ctx)) { ret = PTR_ERR(isi->alloc_ctx); goto err_alloc_ctx; } isi->regs = ioremap(regs->start, resource_size(regs)); if (!isi->regs) { ret = -ENOMEM; goto err_ioremap; } if (pdata->data_width_flags & ISI_DATAWIDTH_8) isi->width_flags = 1 << 7; if (pdata->data_width_flags & ISI_DATAWIDTH_10) isi->width_flags |= 1 << 9; isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS); irq = platform_get_irq(pdev, 0); if (IS_ERR_VALUE(irq)) { ret = irq; goto err_req_irq; } ret = request_irq(irq, isi_interrupt, 0, "isi", isi); if (ret) { dev_err(&pdev->dev, "Unable to request irq %d\n", irq); goto err_req_irq; } isi->irq = irq; soc_host = &isi->soc_host; soc_host->drv_name = "isi-camera"; soc_host->ops = &isi_soc_camera_host_ops; soc_host->priv = isi; soc_host->v4l2_dev.dev = &pdev->dev; soc_host->nr = pdev->id; ret = soc_camera_host_register(soc_host); if (ret) { dev_err(&pdev->dev, "Unable to register soc camera host\n"); goto err_register_soc_camera_host; } return 0; err_register_soc_camera_host: free_irq(isi->irq, isi); err_req_irq: iounmap(isi->regs); err_ioremap: vb2_dma_contig_cleanup_ctx(isi->alloc_ctx); err_alloc_ctx: dma_free_coherent(&pdev->dev, sizeof(struct fbd) * MAX_BUFFER_NUM, isi->p_fb_descriptors, isi->fb_descriptors_phys); err_alloc_descriptors: err_set_mck_rate: clk_unprepare(isi->mck); err_clk_prepare_mck: clk_put(isi->mck); err_clk_get: kfree(isi); err_alloc_isi: clk_unprepare(pclk); err_clk_prepare_pclk: clk_put(pclk); return ret; } static struct platform_driver atmel_isi_driver = { .remove = atmel_isi_remove, .driver = { .name = "atmel_isi", .owner = THIS_MODULE, }, }; module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe); MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>"); MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux"); MODULE_LICENSE("GPL"); MODULE_SUPPORTED_DEVICE("video"); |