/* * The Marvell camera core. This device appears in a number of settings, * so it needs platform-specific support outside of the core. * * Copyright 2011 Jonathan Corbet corbet@lwn.net */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mcam-core.h" #ifdef MCAM_MODE_VMALLOC /* * Internal DMA buffer management. Since the controller cannot do S/G I/O, * we must have physically contiguous buffers to bring frames into. * These parameters control how many buffers we use, whether we * allocate them at load time (better chance of success, but nails down * memory) or when somebody tries to use the camera (riskier), and, * for load-time allocation, how big they should be. * * The controller can cycle through three buffers. We could use * more by flipping pointers around, but it probably makes little * sense. */ static bool alloc_bufs_at_read; module_param(alloc_bufs_at_read, bool, 0444); MODULE_PARM_DESC(alloc_bufs_at_read, "Non-zero value causes DMA buffers to be allocated when the " "video capture device is read, rather than at module load " "time. This saves memory, but decreases the chances of " "successfully getting those buffers. This parameter is " "only used in the vmalloc buffer mode"); static int n_dma_bufs = 3; module_param(n_dma_bufs, uint, 0644); MODULE_PARM_DESC(n_dma_bufs, "The number of DMA buffers to allocate. Can be either two " "(saves memory, makes timing tighter) or three."); static int dma_buf_size = VGA_WIDTH * VGA_HEIGHT * 2; /* Worst case */ module_param(dma_buf_size, uint, 0444); MODULE_PARM_DESC(dma_buf_size, "The size of the allocated DMA buffers. If actual operating " "parameters require larger buffers, an attempt to reallocate " "will be made."); #else /* MCAM_MODE_VMALLOC */ static const bool alloc_bufs_at_read = 0; static const int n_dma_bufs = 3; /* Used by S/G_PARM */ #endif /* MCAM_MODE_VMALLOC */ static bool flip; module_param(flip, bool, 0444); MODULE_PARM_DESC(flip, "If set, the sensor will be instructed to flip the image " "vertically."); static int buffer_mode = -1; module_param(buffer_mode, int, 0444); MODULE_PARM_DESC(buffer_mode, "Set the buffer mode to be used; default is to go with what " "the platform driver asks for. Set to 0 for vmalloc, 1 for " "DMA contiguous."); /* * Status flags. Always manipulated with bit operations. */ #define CF_BUF0_VALID 0 /* Buffers valid - first three */ #define CF_BUF1_VALID 1 #define CF_BUF2_VALID 2 #define CF_DMA_ACTIVE 3 /* A frame is incoming */ #define CF_CONFIG_NEEDED 4 /* Must configure hardware */ #define CF_SINGLE_BUFFER 5 /* Running with a single buffer */ #define CF_SG_RESTART 6 /* SG restart needed */ #define sensor_call(cam, o, f, args...) \ v4l2_subdev_call(cam->sensor, o, f, ##args) static struct mcam_format_struct { __u8 *desc; __u32 pixelformat; int bpp; /* Bytes per pixel */ enum v4l2_mbus_pixelcode mbus_code; } mcam_formats[] = { { .desc = "YUYV 4:2:2", .pixelformat = V4L2_PIX_FMT_YUYV, .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8, .bpp = 2, }, { .desc = "RGB 444", .pixelformat = V4L2_PIX_FMT_RGB444, .mbus_code = V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE, .bpp = 2, }, { .desc = "RGB 565", .pixelformat = V4L2_PIX_FMT_RGB565, .mbus_code = V4L2_MBUS_FMT_RGB565_2X8_LE, .bpp = 2, }, { .desc = "Raw RGB Bayer", .pixelformat = V4L2_PIX_FMT_SBGGR8, .mbus_code = V4L2_MBUS_FMT_SBGGR8_1X8, .bpp = 1 }, }; #define N_MCAM_FMTS ARRAY_SIZE(mcam_formats) static struct mcam_format_struct *mcam_find_format(u32 pixelformat) { unsigned i; for (i = 0; i < N_MCAM_FMTS; i++) if (mcam_formats[i].pixelformat == pixelformat) return mcam_formats + i; /* Not found? Then return the first format. */ return mcam_formats; } /* * The default format we use until somebody says otherwise. */ static const struct v4l2_pix_format mcam_def_pix_format = { .width = VGA_WIDTH, .height = VGA_HEIGHT, .pixelformat = V4L2_PIX_FMT_YUYV, .field = V4L2_FIELD_NONE, .bytesperline = VGA_WIDTH*2, .sizeimage = VGA_WIDTH*VGA_HEIGHT*2, }; static const enum v4l2_mbus_pixelcode mcam_def_mbus_code = V4L2_MBUS_FMT_YUYV8_2X8; /* * The two-word DMA descriptor format used by the Armada 610 and like. There * Is a three-word format as well (set C1_DESC_3WORD) where the third * word is a pointer to the next descriptor, but we don't use it. Two-word * descriptors have to be contiguous in memory. */ struct mcam_dma_desc { u32 dma_addr; u32 segment_len; }; /* * Our buffer type for working with videobuf2. Note that the vb2 * developers have decreed that struct vb2_buffer must be at the * beginning of this structure. */ struct mcam_vb_buffer { struct vb2_buffer vb_buf; struct list_head queue; struct mcam_dma_desc *dma_desc; /* Descriptor virtual address */ dma_addr_t dma_desc_pa; /* Descriptor physical address */ int dma_desc_nent; /* Number of mapped descriptors */ }; static inline struct mcam_vb_buffer *vb_to_mvb(struct vb2_buffer *vb) { return container_of(vb, struct mcam_vb_buffer, vb_buf); } /* * Hand a completed buffer back to user space. */ static void mcam_buffer_done(struct mcam_camera *cam, int frame, struct vb2_buffer *vbuf) { vbuf->v4l2_buf.bytesused = cam->pix_format.sizeimage; vbuf->v4l2_buf.sequence = cam->buf_seq[frame]; vb2_set_plane_payload(vbuf, 0, cam->pix_format.sizeimage); vb2_buffer_done(vbuf, VB2_BUF_STATE_DONE); } /* * Debugging and related. */ #define cam_err(cam, fmt, arg...) \ dev_err((cam)->dev, fmt, ##arg); #define cam_warn(cam, fmt, arg...) \ dev_warn((cam)->dev, fmt, ##arg); #define cam_dbg(cam, fmt, arg...) \ dev_dbg((cam)->dev, fmt, ##arg); /* * Flag manipulation helpers */ static void mcam_reset_buffers(struct mcam_camera *cam) { int i; cam->next_buf = -1; for (i = 0; i < cam->nbufs; i++) clear_bit(i, &cam->flags); } static inline int mcam_needs_config(struct mcam_camera *cam) { return test_bit(CF_CONFIG_NEEDED, &cam->flags); } static void mcam_set_config_needed(struct mcam_camera *cam, int needed) { if (needed) set_bit(CF_CONFIG_NEEDED, &cam->flags); else clear_bit(CF_CONFIG_NEEDED, &cam->flags); } /* ------------------------------------------------------------------- */ /* * Make the controller start grabbing images. Everything must * be set up before doing this. */ static void mcam_ctlr_start(struct mcam_camera *cam) { /* set_bit performs a read, so no other barrier should be needed here */ mcam_reg_set_bit(cam, REG_CTRL0, C0_ENABLE); } static void mcam_ctlr_stop(struct mcam_camera *cam) { mcam_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE); } /* ------------------------------------------------------------------- */ #ifdef MCAM_MODE_VMALLOC /* * Code specific to the vmalloc buffer mode. */ /* * Allocate in-kernel DMA buffers for vmalloc mode. */ static int mcam_alloc_dma_bufs(struct mcam_camera *cam, int loadtime) { int i; mcam_set_config_needed(cam, 1); if (loadtime) cam->dma_buf_size = dma_buf_size; else cam->dma_buf_size = cam->pix_format.sizeimage; if (n_dma_bufs > 3) n_dma_bufs = 3; cam->nbufs = 0; for (i = 0; i < n_dma_bufs; i++) { cam->dma_bufs[i] = dma_alloc_coherent(cam->dev, cam->dma_buf_size, cam->dma_handles + i, GFP_KERNEL); if (cam->dma_bufs[i] == NULL) { cam_warn(cam, "Failed to allocate DMA buffer\n"); break; } (cam->nbufs)++; } switch (cam->nbufs) { case 1: dma_free_coherent(cam->dev, cam->dma_buf_size, cam->dma_bufs[0], cam->dma_handles[0]); cam->nbufs = 0; case 0: cam_err(cam, "Insufficient DMA buffers, cannot operate\n"); return -ENOMEM; case 2: if (n_dma_bufs > 2) cam_warn(cam, "Will limp along with only 2 buffers\n"); break; } return 0; } static void mcam_free_dma_bufs(struct mcam_camera *cam) { int i; for (i = 0; i < cam->nbufs; i++) { dma_free_coherent(cam->dev, cam->dma_buf_size, cam->dma_bufs[i], cam->dma_handles[i]); cam->dma_bufs[i] = NULL; } cam->nbufs = 0; } /* * Set up DMA buffers when operating in vmalloc mode */ static void mcam_ctlr_dma_vmalloc(struct mcam_camera *cam) { /* * Store the first two Y buffers (we aren't supporting * planar formats for now, so no UV bufs). Then either * set the third if it exists, or tell the controller * to just use two. */ mcam_reg_write(cam, REG_Y0BAR, cam->dma_handles[0]); mcam_reg_write(cam, REG_Y1BAR, cam->dma_handles[1]); if (cam->nbufs > 2) { mcam_reg_write(cam, REG_Y2BAR, cam->dma_handles[2]); mcam_reg_clear_bit(cam, REG_CTRL1, C1_TWOBUFS); } else mcam_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS); if (cam->chip_id == V4L2_IDENT_CAFE) mcam_reg_write(cam, REG_UBAR, 0); /* 32 bits only */ } /* * Copy data out to user space in the vmalloc case */ static void mcam_frame_tasklet(unsigned long data) { struct mcam_camera *cam = (struct mcam_camera *) data; int i; unsigned long flags; struct mcam_vb_buffer *buf; spin_lock_irqsave(&cam->dev_lock, flags); for (i = 0; i < cam->nbufs; i++) { int bufno = cam->next_buf; if (cam->state != S_STREAMING || bufno < 0) break; /* I/O got stopped */ if (++(cam->next_buf) >= cam->nbufs) cam->next_buf = 0; if (!test_bit(bufno, &cam->flags)) continue; if (list_empty(&cam->buffers)) { cam->frame_state.singles++; break; /* Leave it valid, hope for better later */ } cam->frame_state.delivered++; clear_bit(bufno, &cam->flags); buf = list_first_entry(&cam->buffers, struct mcam_vb_buffer, queue); list_del_init(&buf->queue); /* * Drop the lock during the big copy. This *should* be safe... */ spin_unlock_irqrestore(&cam->dev_lock, flags); memcpy(vb2_plane_vaddr(&buf->vb_buf, 0), cam->dma_bufs[bufno], cam->pix_format.sizeimage); mcam_buffer_done(cam, bufno, &buf->vb_buf); spin_lock_irqsave(&cam->dev_lock, flags); } spin_unlock_irqrestore(&cam->dev_lock, flags); } /* * Make sure our allocated buffers are up to the task. */ static int mcam_check_dma_buffers(struct mcam_camera *cam) { if (cam->nbufs > 0 && cam->dma_buf_size < cam->pix_format.sizeimage) mcam_free_dma_bufs(cam); if (cam->nbufs == 0) return mcam_alloc_dma_bufs(cam, 0); return 0; } static void mcam_vmalloc_done(struct mcam_camera *cam, int frame) { tasklet_schedule(&cam->s_tasklet); } #else /* MCAM_MODE_VMALLOC */ static inline int mcam_alloc_dma_bufs(struct mcam_camera *cam, int loadtime) { return 0; } static inline void mcam_free_dma_bufs(struct mcam_camera *cam) { return; } static inline int mcam_check_dma_buffers(struct mcam_camera *cam) { return 0; } #endif /* MCAM_MODE_VMALLOC */ #ifdef MCAM_MODE_DMA_CONTIG /* ---------------------------------------------------------------------- */ /* * DMA-contiguous code. */ /* * Set up a contiguous buffer for the given frame. Here also is where * the underrun strategy is set: if there is no buffer available, reuse * the buffer from the other BAR and set the CF_SINGLE_BUFFER flag to * keep the interrupt handler from giving that buffer back to user * space. In this way, we always have a buffer to DMA to and don't * have to try to play games stopping and restarting the controller. */ static void mcam_set_contig_buffer(struct mcam_camera *cam, int frame) { struct mcam_vb_buffer *buf; /* * If there are no available buffers, go into single mode */ if (list_empty(&cam->buffers)) { buf = cam->vb_bufs[frame ^ 0x1]; cam->vb_bufs[frame] = buf; mcam_reg_write(cam, frame == 0 ? REG_Y0BAR : REG_Y1BAR, vb2_dma_contig_plane_dma_addr(&buf->vb_buf, 0)); set_bit(CF_SINGLE_BUFFER, &cam->flags); cam->frame_state.singles++; return; } /* * OK, we have a buffer we can use. */ buf = list_first_entry(&cam->buffers, struct mcam_vb_buffer, queue); list_del_init(&buf->queue); mcam_reg_write(cam, frame == 0 ? REG_Y0BAR : REG_Y1BAR, vb2_dma_contig_plane_dma_addr(&buf->vb_buf, 0)); cam->vb_bufs[frame] = buf; clear_bit(CF_SINGLE_BUFFER, &cam->flags); } /* * Initial B_DMA_contig setup. */ static void mcam_ctlr_dma_contig(struct mcam_camera *cam) { mcam_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS); cam->nbufs = 2; mcam_set_contig_buffer(cam, 0); mcam_set_contig_buffer(cam, 1); } /* * Frame completion handling. */ static void mcam_dma_contig_done(struct mcam_camera *cam, int frame) { struct mcam_vb_buffer *buf = cam->vb_bufs[frame]; if (!test_bit(CF_SINGLE_BUFFER, &cam->flags)) { cam->frame_state.delivered++; mcam_buffer_done(cam, frame, &buf->vb_buf); } mcam_set_contig_buffer(cam, frame); } #endif /* MCAM_MODE_DMA_CONTIG */ #ifdef MCAM_MODE_DMA_SG /* ---------------------------------------------------------------------- */ /* * Scatter/gather-specific code. */ /* * Set up the next buffer for S/G I/O; caller should be sure that * the controller is stopped and a buffer is available. */ static void mcam_sg_next_buffer(struct mcam_camera *cam) { struct mcam_vb_buffer *buf; buf = list_first_entry(&cam->buffers, struct mcam_vb_buffer, queue); list_del_init(&buf->queue); /* * Very Bad Not Good Things happen if you don't clear * C1_DESC_ENA before making any descriptor changes. */ mcam_reg_clear_bit(cam, REG_CTRL1, C1_DESC_ENA); mcam_reg_write(cam, REG_DMA_DESC_Y, buf->dma_desc_pa); mcam_reg_write(cam, REG_DESC_LEN_Y, buf->dma_desc_nent*sizeof(struct mcam_dma_desc)); mcam_reg_write(cam, REG_DESC_LEN_U, 0); mcam_reg_write(cam, REG_DESC_LEN_V, 0); mcam_reg_set_bit(cam, REG_CTRL1, C1_DESC_ENA); cam->vb_bufs[0] = buf; } /* * Initial B_DMA_sg setup */ static void mcam_ctlr_dma_sg(struct mcam_camera *cam) { /* * The list-empty condition can hit us at resume time * if the buffer list was empty when the system was suspended. */ if (list_empty(&cam->buffers)) { set_bit(CF_SG_RESTART, &cam->flags); return; } mcam_reg_clear_bit(cam, REG_CTRL1, C1_DESC_3WORD); mcam_sg_next_buffer(cam); cam->nbufs = 3; } /* * Frame completion with S/G is trickier. We can't muck with * a descriptor chain on the fly, since the controller buffers it * internally. So we have to actually stop and restart; Marvell * says this is the way to do it. * * Of course, stopping is easier said than done; experience shows * that the controller can start a frame *after* C0_ENABLE has been * cleared. So when running in S/G mode, the controller is "stopped" * on receipt of the start-of-frame interrupt. That means we can * safely change the DMA descriptor array here and restart things * (assuming there's another buffer waiting to go). */ static void mcam_dma_sg_done(struct mcam_camera *cam, int frame) { struct mcam_vb_buffer *buf = cam->vb_bufs[0]; /* * If we're no longer supposed to be streaming, don't do anything. */ if (cam->state != S_STREAMING) return; /* * If we have another buffer available, put it in and * restart the engine. */ if (!list_empty(&cam->buffers)) { mcam_sg_next_buffer(cam); mcam_ctlr_start(cam); /* * Otherwise set CF_SG_RESTART and the controller will * be restarted once another buffer shows up. */ } else { set_bit(CF_SG_RESTART, &cam->flags); cam->frame_state.singles++; cam->vb_bufs[0] = NULL; } /* * Now we can give the completed frame back to user space. */ cam->frame_state.delivered++; mcam_buffer_done(cam, frame, &buf->vb_buf); } /* * Scatter/gather mode requires stopping the controller between * frames so we can put in a new DMA descriptor array. If no new * buffer exists at frame completion, the controller is left stopped; * this function is charged with gettig things going again. */ static void mcam_sg_restart(struct mcam_camera *cam) { mcam_ctlr_dma_sg(cam); mcam_ctlr_start(cam); clear_bit(CF_SG_RESTART, &cam->flags); } #else /* MCAM_MODE_DMA_SG */ static inline void mcam_sg_restart(struct mcam_camera *cam) { return; } #endif /* MCAM_MODE_DMA_SG */ /* ---------------------------------------------------------------------- */ /* * Buffer-mode-independent controller code. */ /* * Image format setup */ static void mcam_ctlr_image(struct mcam_camera *cam) { int imgsz; struct v4l2_pix_format *fmt = &cam->pix_format; imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) | (fmt->bytesperline & IMGSZ_H_MASK); mcam_reg_write(cam, REG_IMGSIZE, imgsz); mcam_reg_write(cam, REG_IMGOFFSET, 0); /* YPITCH just drops the last two bits */ mcam_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline, IMGP_YP_MASK); /* * Tell the controller about the image format we are using. */ switch (cam->pix_format.pixelformat) { case V4L2_PIX_FMT_YUYV: mcam_reg_write_mask(cam, REG_CTRL0, C0_DF_YUV|C0_YUV_PACKED|C0_YUVE_YUYV, C0_DF_MASK); break; case V4L2_PIX_FMT_RGB444: mcam_reg_write_mask(cam, REG_CTRL0, C0_DF_RGB|C0_RGBF_444|C0_RGB4_XRGB, C0_DF_MASK); /* Alpha value? */ break; case V4L2_PIX_FMT_RGB565: mcam_reg_write_mask(cam, REG_CTRL0, C0_DF_RGB|C0_RGBF_565|C0_RGB5_BGGR, C0_DF_MASK); break; default: cam_err(cam, "Unknown format %x\n", cam->pix_format.pixelformat); break; } /* * Make sure it knows we want to use hsync/vsync. */ mcam_reg_write_mask(cam, REG_CTRL0, C0_SIF_HVSYNC, C0_SIFM_MASK); } /* * Configure the controller for operation; caller holds the * device mutex. */ static int mcam_ctlr_configure(struct mcam_camera *cam) { unsigned long flags; spin_lock_irqsave(&cam->dev_lock, flags); clear_bit(CF_SG_RESTART, &cam->flags); cam->dma_setup(cam); mcam_ctlr_image(cam); mcam_set_config_needed(cam, 0); spin_unlock_irqrestore(&cam->dev_lock, flags); return 0; } static void mcam_ctlr_irq_enable(struct mcam_camera *cam) { /* * Clear any pending interrupts, since we do not * expect to have I/O active prior to enabling. */ mcam_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); mcam_reg_set_bit(cam, REG_IRQMASK, FRAMEIRQS); } static void mcam_ctlr_irq_disable(struct mcam_camera *cam) { mcam_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS); } static void mcam_ctlr_init(struct mcam_camera *cam) { unsigned long flags; spin_lock_irqsave(&cam->dev_lock, flags); /* * Make sure it's not powered down. */ mcam_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN); /* * Turn off the enable bit. It sure should be off anyway, * but it's good to be sure. */ mcam_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE); /* * Clock the sensor appropriately. Controller clock should * be 48MHz, sensor "typical" value is half that. */ mcam_reg_write_mask(cam, REG_CLKCTRL, 2, CLK_DIV_MASK); spin_unlock_irqrestore(&cam->dev_lock, flags); } /* * Stop the controller, and don't return until we're really sure that no * further DMA is going on. */ static void mcam_ctlr_stop_dma(struct mcam_camera *cam) { unsigned long flags; /* * Theory: stop the camera controller (whether it is operating * or not). Delay briefly just in case we race with the SOF * interrupt, then wait until no DMA is active. */ spin_lock_irqsave(&cam->dev_lock, flags); clear_bit(CF_SG_RESTART, &cam->flags); mcam_ctlr_stop(cam); cam->state = S_IDLE; spin_unlock_irqrestore(&cam->dev_lock, flags); /* * This is a brutally long sleep, but experience shows that * it can take the controller a while to get the message that * it needs to stop grabbing frames. In particular, we can * sometimes (on mmp) get a frame at the end WITHOUT the * start-of-frame indication. */ msleep(150); if (test_bit(CF_DMA_ACTIVE, &cam->flags)) cam_err(cam, "Timeout waiting for DMA to end\n"); /* This would be bad news - what now? */ spin_lock_irqsave(&cam->dev_lock, flags); mcam_ctlr_irq_disable(cam); spin_unlock_irqrestore(&cam->dev_lock, flags); } /* * Power up and down. */ static void mcam_ctlr_power_up(struct mcam_camera *cam) { unsigned long flags; spin_lock_irqsave(&cam->dev_lock, flags); cam->plat_power_up(cam); mcam_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN); spin_unlock_irqrestore(&cam->dev_lock, flags); msleep(5); /* Just to be sure */ } static void mcam_ctlr_power_down(struct mcam_camera *cam) { unsigned long flags; spin_lock_irqsave(&cam->dev_lock, flags); /* * School of hard knocks department: be sure we do any register * twiddling on the controller *before* calling the platform * power down routine. */ mcam_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN); cam->plat_power_down(cam); spin_unlock_irqrestore(&cam->dev_lock, flags); } /* -------------------------------------------------------------------- */ /* * Communications with the sensor. */ static int __mcam_cam_reset(struct mcam_camera *cam) { return sensor_call(cam, core, reset, 0); } /* * We have found the sensor on the i2c. Let's try to have a * conversation. */ static int mcam_cam_init(struct mcam_camera *cam) { struct v4l2_dbg_chip_ident chip; int ret; mutex_lock(&cam->s_mutex); if (cam->state != S_NOTREADY) cam_warn(cam, "Cam init with device in funky state %d", cam->state); ret = __mcam_cam_reset(cam); if (ret) goto out; chip.ident = V4L2_IDENT_NONE; chip.match.type = V4L2_CHIP_MATCH_I2C_ADDR; chip.match.addr = cam->sensor_addr; ret = sensor_call(cam, core, g_chip_ident, &chip); if (ret) goto out; cam->sensor_type = chip.ident; if (cam->sensor_type != V4L2_IDENT_OV7670) { cam_err(cam, "Unsupported sensor type 0x%x", cam->sensor_type); ret = -EINVAL; goto out; } /* Get/set parameters? */ ret = 0; cam->state = S_IDLE; out: mcam_ctlr_power_down(cam); mutex_unlock(&cam->s_mutex); return ret; } /* * Configure the sensor to match the parameters we have. Caller should * hold s_mutex */ static int mcam_cam_set_flip(struct mcam_camera *cam) { struct v4l2_control ctrl; memset(&ctrl, 0, sizeof(ctrl)); ctrl.id = V4L2_CID_VFLIP; ctrl.value = flip; return sensor_call(cam, core, s_ctrl, &ctrl); } static int mcam_cam_configure(struct mcam_camera *cam) { struct v4l2_mbus_framefmt mbus_fmt; int ret; v4l2_fill_mbus_format(&mbus_fmt, &cam->pix_format, cam->mbus_code); ret = sensor_call(cam, core, init, 0); if (ret == 0) ret = sensor_call(cam, video, s_mbus_fmt, &mbus_fmt); /* * OV7670 does weird things if flip is set *before* format... */ ret += mcam_cam_set_flip(cam); return ret; } /* * Get everything ready, and start grabbing frames. */ static int mcam_read_setup(struct mcam_camera *cam) { int ret; unsigned long flags; /* * Configuration. If we still don't have DMA buffers, * make one last, desperate attempt. */ if (cam->buffer_mode == B_vmalloc && cam->nbufs == 0 && mcam_alloc_dma_bufs(cam, 0)) return -ENOMEM; if (mcam_needs_config(cam)) { mcam_cam_configure(cam); ret = mcam_ctlr_configure(cam); if (ret) return ret; } /* * Turn it loose. */ spin_lock_irqsave(&cam->dev_lock, flags); clear_bit(CF_DMA_ACTIVE, &cam->flags); mcam_reset_buffers(cam); mcam_ctlr_irq_enable(cam); cam->state = S_STREAMING; if (!test_bit(CF_SG_RESTART, &cam->flags)) mcam_ctlr_start(cam); spin_unlock_irqrestore(&cam->dev_lock, flags); return 0; } /* ----------------------------------------------------------------------- */ /* * Videobuf2 interface code. */ static int mcam_vb_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt, unsigned int *nbufs, unsigned int *num_planes, unsigned int sizes[], void *alloc_ctxs[]) { struct mcam_camera *cam = vb2_get_drv_priv(vq); int minbufs = (cam->buffer_mode == B_DMA_contig) ? 3 : 2; sizes[0] = cam->pix_format.sizeimage; *num_planes = 1; /* Someday we have to support planar formats... */ if (*nbufs < minbufs) *nbufs = minbufs; if (cam->buffer_mode == B_DMA_contig) alloc_ctxs[0] = cam->vb_alloc_ctx; return 0; } static void mcam_vb_buf_queue(struct vb2_buffer *vb) { struct mcam_vb_buffer *mvb = vb_to_mvb(vb); struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue); unsigned long flags; int start; spin_lock_irqsave(&cam->dev_lock, flags); start = (cam->state == S_BUFWAIT) && !list_empty(&cam->buffers); list_add(&mvb->queue, &cam->buffers); if (cam->state == S_STREAMING && test_bit(CF_SG_RESTART, &cam->flags)) mcam_sg_restart(cam); spin_unlock_irqrestore(&cam->dev_lock, flags); if (start) mcam_read_setup(cam); } /* * vb2 uses these to release the mutex when waiting in dqbuf. I'm * not actually sure we need to do this (I'm not sure that vb2_dqbuf() needs * to be called with the mutex held), but better safe than sorry. */ static void mcam_vb_wait_prepare(struct vb2_queue *vq) { struct mcam_camera *cam = vb2_get_drv_priv(vq); mutex_unlock(&cam->s_mutex); } static void mcam_vb_wait_finish(struct vb2_queue *vq) { struct mcam_camera *cam = vb2_get_drv_priv(vq); mutex_lock(&cam->s_mutex); } /* * These need to be called with the mutex held from vb2 */ static int mcam_vb_start_streaming(struct vb2_queue *vq, unsigned int count) { struct mcam_camera *cam = vb2_get_drv_priv(vq); if (cam->state != S_IDLE) { INIT_LIST_HEAD(&cam->buffers); return -EINVAL; } cam->sequence = 0; /* * Videobuf2 sneakily hoards all the buffers and won't * give them to us until *after* streaming starts. But * we can't actually start streaming until we have a * destination. So go into a wait state and hope they * give us buffers soon. */ if (cam->buffer_mode != B_vmalloc && list_empty(&cam->buffers)) { cam->state = S_BUFWAIT; return 0; } return mcam_read_setup(cam); } static int mcam_vb_stop_streaming(struct vb2_queue *vq) { struct mcam_camera *cam = vb2_get_drv_priv(vq); unsigned long flags; if (cam->state == S_BUFWAIT) { /* They never gave us buffers */ cam->state = S_IDLE; return 0; } if (cam->state != S_STREAMING) return -EINVAL; mcam_ctlr_stop_dma(cam); /* * VB2 reclaims the buffers, so we need to forget * about them. */ spin_lock_irqsave(&cam->dev_lock, flags); INIT_LIST_HEAD(&cam->buffers); spin_unlock_irqrestore(&cam->dev_lock, flags); return 0; } static const struct vb2_ops mcam_vb2_ops = { .queue_setup = mcam_vb_queue_setup, .buf_queue = mcam_vb_buf_queue, .start_streaming = mcam_vb_start_streaming, .stop_streaming = mcam_vb_stop_streaming, .wait_prepare = mcam_vb_wait_prepare, .wait_finish = mcam_vb_wait_finish, }; #ifdef MCAM_MODE_DMA_SG /* * Scatter/gather mode uses all of the above functions plus a * few extras to deal with DMA mapping. */ static int mcam_vb_sg_buf_init(struct vb2_buffer *vb) { struct mcam_vb_buffer *mvb = vb_to_mvb(vb); struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue); int ndesc = cam->pix_format.sizeimage/PAGE_SIZE + 1; mvb->dma_desc = dma_alloc_coherent(cam->dev, ndesc * sizeof(struct mcam_dma_desc), &mvb->dma_desc_pa, GFP_KERNEL); if (mvb->dma_desc == NULL) { cam_err(cam, "Unable to get DMA descriptor array\n"); return -ENOMEM; } return 0; } static int mcam_vb_sg_buf_prepare(struct vb2_buffer *vb) { struct mcam_vb_buffer *mvb = vb_to_mvb(vb); struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue); struct vb2_dma_sg_desc *sgd = vb2_dma_sg_plane_desc(vb, 0); struct mcam_dma_desc *desc = mvb->dma_desc; struct scatterlist *sg; int i; mvb->dma_desc_nent = dma_map_sg(cam->dev, sgd->sglist, sgd->num_pages, DMA_FROM_DEVICE); if (mvb->dma_desc_nent <= 0) return -EIO; /* Not sure what's right here */ for_each_sg(sgd->sglist, sg, mvb->dma_desc_nent, i) { desc->dma_addr = sg_dma_address(sg); desc->segment_len = sg_dma_len(sg); desc++; } return 0; } static int mcam_vb_sg_buf_finish(struct vb2_buffer *vb) { struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue); struct vb2_dma_sg_desc *sgd = vb2_dma_sg_plane_desc(vb, 0); dma_unmap_sg(cam->dev, sgd->sglist, sgd->num_pages, DMA_FROM_DEVICE); return 0; } static void mcam_vb_sg_buf_cleanup(struct vb2_buffer *vb) { struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue); struct mcam_vb_buffer *mvb = vb_to_mvb(vb); int ndesc = cam->pix_format.sizeimage/PAGE_SIZE + 1; dma_free_coherent(cam->dev, ndesc * sizeof(struct mcam_dma_desc), mvb->dma_desc, mvb->dma_desc_pa); } static const struct vb2_ops mcam_vb2_sg_ops = { .queue_setup = mcam_vb_queue_setup, .buf_init = mcam_vb_sg_buf_init, .buf_prepare = mcam_vb_sg_buf_prepare, .buf_queue = mcam_vb_buf_queue, .buf_finish = mcam_vb_sg_buf_finish, .buf_cleanup = mcam_vb_sg_buf_cleanup, .start_streaming = mcam_vb_start_streaming, .stop_streaming = mcam_vb_stop_streaming, .wait_prepare = mcam_vb_wait_prepare, .wait_finish = mcam_vb_wait_finish, }; #endif /* MCAM_MODE_DMA_SG */ static int mcam_setup_vb2(struct mcam_camera *cam) { struct vb2_queue *vq = &cam->vb_queue; memset(vq, 0, sizeof(*vq)); vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; vq->drv_priv = cam; INIT_LIST_HEAD(&cam->buffers); switch (cam->buffer_mode) { case B_DMA_contig: #ifdef MCAM_MODE_DMA_CONTIG vq->ops = &mcam_vb2_ops; vq->mem_ops = &vb2_dma_contig_memops; cam->vb_alloc_ctx = vb2_dma_contig_init_ctx(cam->dev); vq->io_modes = VB2_MMAP | VB2_USERPTR; cam->dma_setup = mcam_ctlr_dma_contig; cam->frame_complete = mcam_dma_contig_done; #endif break; case B_DMA_sg: #ifdef MCAM_MODE_DMA_SG vq->ops = &mcam_vb2_sg_ops; vq->mem_ops = &vb2_dma_sg_memops; vq->io_modes = VB2_MMAP | VB2_USERPTR; cam->dma_setup = mcam_ctlr_dma_sg; cam->frame_complete = mcam_dma_sg_done; #endif break; case B_vmalloc: #ifdef MCAM_MODE_VMALLOC tasklet_init(&cam->s_tasklet, mcam_frame_tasklet, (unsigned long) cam); vq->ops = &mcam_vb2_ops; vq->mem_ops = &vb2_vmalloc_memops; vq->buf_struct_size = sizeof(struct mcam_vb_buffer); vq->io_modes = VB2_MMAP; cam->dma_setup = mcam_ctlr_dma_vmalloc; cam->frame_complete = mcam_vmalloc_done; #endif break; } return vb2_queue_init(vq); } static void mcam_cleanup_vb2(struct mcam_camera *cam) { vb2_queue_release(&cam->vb_queue); #ifdef MCAM_MODE_DMA_CONTIG if (cam->buffer_mode == B_DMA_contig) vb2_dma_contig_cleanup_ctx(cam->vb_alloc_ctx); #endif } /* ---------------------------------------------------------------------- */ /* * The long list of V4L2 ioctl() operations. */ static int mcam_vidioc_streamon(struct file *filp, void *priv, enum v4l2_buf_type type) { struct mcam_camera *cam = filp->private_data; int ret; mutex_lock(&cam->s_mutex); ret = vb2_streamon(&cam->vb_queue, type); mutex_unlock(&cam->s_mutex); return ret; } static int mcam_vidioc_streamoff(struct file *filp, void *priv, enum v4l2_buf_type type) { struct mcam_camera *cam = filp->private_data; int ret; mutex_lock(&cam->s_mutex); ret = vb2_streamoff(&cam->vb_queue, type); mutex_unlock(&cam->s_mutex); return ret; } static int mcam_vidioc_reqbufs(struct file *filp, void *priv, struct v4l2_requestbuffers *req) { struct mcam_camera *cam = filp->private_data; int ret; mutex_lock(&cam->s_mutex); ret = vb2_reqbufs(&cam->vb_queue, req); mutex_unlock(&cam->s_mutex); return ret; } static int mcam_vidioc_querybuf(struct file *filp, void *priv, struct v4l2_buffer *buf) { struct mcam_camera *cam = filp->private_data; int ret; mutex_lock(&cam->s_mutex); ret = vb2_querybuf(&cam->vb_queue, buf); mutex_unlock(&cam->s_mutex); return ret; } static int mcam_vidioc_qbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) { struct mcam_camera *cam = filp->private_data; int ret; mutex_lock(&cam->s_mutex); ret = vb2_qbuf(&cam->vb_queue, buf); mutex_unlock(&cam->s_mutex); return ret; } static int mcam_vidioc_dqbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) { struct mcam_camera *cam = filp->private_data; int ret; mutex_lock(&cam->s_mutex); ret = vb2_dqbuf(&cam->vb_queue, buf, filp->f_flags & O_NONBLOCK); mutex_unlock(&cam->s_mutex); return ret; } static int mcam_vidioc_querycap(struct file *file, void *priv, struct v4l2_capability *cap) { strcpy(cap->driver, "marvell_ccic"); strcpy(cap->card, "marvell_ccic"); cap->version = 1; cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; return 0; } static int mcam_vidioc_enum_fmt_vid_cap(struct file *filp, void *priv, struct v4l2_fmtdesc *fmt) { if (fmt->index >= N_MCAM_FMTS) return -EINVAL; strlcpy(fmt->description, mcam_formats[fmt->index].desc, sizeof(fmt->description)); fmt->pixelformat = mcam_formats[fmt->index].pixelformat; return 0; } static int mcam_vidioc_try_fmt_vid_cap(struct file *filp, void *priv, struct v4l2_format *fmt) { struct mcam_camera *cam = priv; struct mcam_format_struct *f; struct v4l2_pix_format *pix = &fmt->fmt.pix; struct v4l2_mbus_framefmt mbus_fmt; int ret; f = mcam_find_format(pix->pixelformat); pix->pixelformat = f->pixelformat; v4l2_fill_mbus_format(&mbus_fmt, pix, f->mbus_code); mutex_lock(&cam->s_mutex); ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt); mutex_unlock(&cam->s_mutex); v4l2_fill_pix_format(pix, &mbus_fmt); pix->bytesperline = pix->width * f->bpp; pix->sizeimage = pix->height * pix->bytesperline; return ret; } static int mcam_vidioc_s_fmt_vid_cap(struct file *filp, void *priv, struct v4l2_format *fmt) { struct mcam_camera *cam = priv; struct mcam_format_struct *f; int ret; /* * Can't do anything if the device is not idle * Also can't if there are streaming buffers in place. */ if (cam->state != S_IDLE || cam->vb_queue.num_buffers > 0) return -EBUSY; f = mcam_find_format(fmt->fmt.pix.pixelformat); /* * See if the formatting works in principle. */ ret = mcam_vidioc_try_fmt_vid_cap(filp, priv, fmt); if (ret) return ret; /* * Now we start to change things for real, so let's do it * under lock. */ mutex_lock(&cam->s_mutex); cam->pix_format = fmt->fmt.pix; cam->mbus_code = f->mbus_code; /* * Make sure we have appropriate DMA buffers. */ if (cam->buffer_mode == B_vmalloc) { ret = mcam_check_dma_buffers(cam); if (ret) goto out; } mcam_set_config_needed(cam, 1); out: mutex_unlock(&cam->s_mutex); return ret; } /* * Return our stored notion of how the camera is/should be configured. * The V4l2 spec wants us to be smarter, and actually get this from * the camera (and not mess with it at open time). Someday. */ static int mcam_vidioc_g_fmt_vid_cap(struct file *filp, void *priv, struct v4l2_format *f) { struct mcam_camera *cam = priv; f->fmt.pix = cam->pix_format; return 0; } /* * We only have one input - the sensor - so minimize the nonsense here. */ static int mcam_vidioc_enum_input(struct file *filp, void *priv, struct v4l2_input *input) { if (input->index != 0) return -EINVAL; input->type = V4L2_INPUT_TYPE_CAMERA; input->std = V4L2_STD_ALL; /* Not sure what should go here */ strcpy(input->name, "Camera"); return 0; } static int mcam_vidioc_g_input(struct file *filp, void *priv, unsigned int *i) { *i = 0; return 0; } static int mcam_vidioc_s_input(struct file *filp, void *priv, unsigned int i) { if (i != 0) return -EINVAL; return 0; } /* from vivi.c */ static int mcam_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a) { return 0; } /* * G/S_PARM. Most of this is done by the sensor, but we are * the level which controls the number of read buffers. */ static int mcam_vidioc_g_parm(struct file *filp, void *priv, struct v4l2_streamparm *parms) { struct mcam_camera *cam = priv; int ret; mutex_lock(&cam->s_mutex); ret = sensor_call(cam, video, g_parm, parms); mutex_unlock(&cam->s_mutex); parms->parm.capture.readbuffers = n_dma_bufs; return ret; } static int mcam_vidioc_s_parm(struct file *filp, void *priv, struct v4l2_streamparm *parms) { struct mcam_camera *cam = priv; int ret; mutex_lock(&cam->s_mutex); ret = sensor_call(cam, video, s_parm, parms); mutex_unlock(&cam->s_mutex); parms->parm.capture.readbuffers = n_dma_bufs; return ret; } static int mcam_vidioc_g_chip_ident(struct file *file, void *priv, struct v4l2_dbg_chip_ident *chip) { struct mcam_camera *cam = priv; chip->ident = V4L2_IDENT_NONE; chip->revision = 0; if (v4l2_chip_match_host(&chip->match)) { chip->ident = cam->chip_id; return 0; } return sensor_call(cam, core, g_chip_ident, chip); } static int mcam_vidioc_enum_framesizes(struct file *filp, void *priv, struct v4l2_frmsizeenum *sizes) { struct mcam_camera *cam = priv; int ret; mutex_lock(&cam->s_mutex); ret = sensor_call(cam, video, enum_framesizes, sizes); mutex_unlock(&cam->s_mutex); return ret; } static int mcam_vidioc_enum_frameintervals(struct file *filp, void *priv, struct v4l2_frmivalenum *interval) { struct mcam_camera *cam = priv; int ret; mutex_lock(&cam->s_mutex); ret = sensor_call(cam, video, enum_frameintervals, interval); mutex_unlock(&cam->s_mutex); return ret; } #ifdef CONFIG_VIDEO_ADV_DEBUG static int mcam_vidioc_g_register(struct file *file, void *priv, struct v4l2_dbg_register *reg) { struct mcam_camera *cam = priv; if (v4l2_chip_match_host(®->match)) { reg->val = mcam_reg_read(cam, reg->reg); reg->size = 4; return 0; } return sensor_call(cam, core, g_register, reg); } static int mcam_vidioc_s_register(struct file *file, void *priv, struct v4l2_dbg_register *reg) { struct mcam_camera *cam = priv; if (v4l2_chip_match_host(®->match)) { mcam_reg_write(cam, reg->reg, reg->val); return 0; } return sensor_call(cam, core, s_register, reg); } #endif static const struct v4l2_ioctl_ops mcam_v4l_ioctl_ops = { .vidioc_querycap = mcam_vidioc_querycap, .vidioc_enum_fmt_vid_cap = mcam_vidioc_enum_fmt_vid_cap, .vidioc_try_fmt_vid_cap = mcam_vidioc_try_fmt_vid_cap, .vidioc_s_fmt_vid_cap = mcam_vidioc_s_fmt_vid_cap, .vidioc_g_fmt_vid_cap = mcam_vidioc_g_fmt_vid_cap, .vidioc_enum_input = mcam_vidioc_enum_input, .vidioc_g_input = mcam_vidioc_g_input, .vidioc_s_input = mcam_vidioc_s_input, .vidioc_s_std = mcam_vidioc_s_std, .vidioc_reqbufs = mcam_vidioc_reqbufs, .vidioc_querybuf = mcam_vidioc_querybuf, .vidioc_qbuf = mcam_vidioc_qbuf, .vidioc_dqbuf = mcam_vidioc_dqbuf, .vidioc_streamon = mcam_vidioc_streamon, .vidioc_streamoff = mcam_vidioc_streamoff, .vidioc_g_parm = mcam_vidioc_g_parm, .vidioc_s_parm = mcam_vidioc_s_parm, .vidioc_enum_framesizes = mcam_vidioc_enum_framesizes, .vidioc_enum_frameintervals = mcam_vidioc_enum_frameintervals, .vidioc_g_chip_ident = mcam_vidioc_g_chip_ident, #ifdef CONFIG_VIDEO_ADV_DEBUG .vidioc_g_register = mcam_vidioc_g_register, .vidioc_s_register = mcam_vidioc_s_register, #endif }; /* ---------------------------------------------------------------------- */ /* * Our various file operations. */ static int mcam_v4l_open(struct file *filp) { struct mcam_camera *cam = video_drvdata(filp); int ret = 0; filp->private_data = cam; cam->frame_state.frames = 0; cam->frame_state.singles = 0; cam->frame_state.delivered = 0; mutex_lock(&cam->s_mutex); if (cam->users == 0) { ret = mcam_setup_vb2(cam); if (ret) goto out; mcam_ctlr_power_up(cam); __mcam_cam_reset(cam); mcam_set_config_needed(cam, 1); } (cam->users)++; out: mutex_unlock(&cam->s_mutex); return ret; } static int mcam_v4l_release(struct file *filp) { struct mcam_camera *cam = filp->private_data; cam_dbg(cam, "Release, %d frames, %d singles, %d delivered\n", cam->frame_state.frames, cam->frame_state.singles, cam->frame_state.delivered); mutex_lock(&cam->s_mutex); (cam->users)--; if (cam->users == 0) { mcam_ctlr_stop_dma(cam); mcam_cleanup_vb2(cam); mcam_ctlr_power_down(cam); if (cam->buffer_mode == B_vmalloc && alloc_bufs_at_read) mcam_free_dma_bufs(cam); } mutex_unlock(&cam->s_mutex); return 0; } static ssize_t mcam_v4l_read(struct file *filp, char __user *buffer, size_t len, loff_t *pos) { struct mcam_camera *cam = filp->private_data; int ret; mutex_lock(&cam->s_mutex); ret = vb2_read(&cam->vb_queue, buffer, len, pos, filp->f_flags & O_NONBLOCK); mutex_unlock(&cam->s_mutex); return ret; } static unsigned int mcam_v4l_poll(struct file *filp, struct poll_table_struct *pt) { struct mcam_camera *cam = filp->private_data; int ret; mutex_lock(&cam->s_mutex); ret = vb2_poll(&cam->vb_queue, filp, pt); mutex_unlock(&cam->s_mutex); return ret; } static int mcam_v4l_mmap(struct file *filp, struct vm_area_struct *vma) { struct mcam_camera *cam = filp->private_data; int ret; mutex_lock(&cam->s_mutex); ret = vb2_mmap(&cam->vb_queue, vma); mutex_unlock(&cam->s_mutex); return ret; } static const struct v4l2_file_operations mcam_v4l_fops = { .owner = THIS_MODULE, .open = mcam_v4l_open, .release = mcam_v4l_release, .read = mcam_v4l_read, .poll = mcam_v4l_poll, .mmap = mcam_v4l_mmap, .unlocked_ioctl = video_ioctl2, }; /* * This template device holds all of those v4l2 methods; we * clone it for specific real devices. */ static struct video_device mcam_v4l_template = { .name = "mcam", .tvnorms = V4L2_STD_NTSC_M, .current_norm = V4L2_STD_NTSC_M, /* make mplayer happy */ .fops = &mcam_v4l_fops, .ioctl_ops = &mcam_v4l_ioctl_ops, .release = video_device_release_empty, }; /* ---------------------------------------------------------------------- */ /* * Interrupt handler stuff */ static void mcam_frame_complete(struct mcam_camera *cam, int frame) { /* * Basic frame housekeeping. */ set_bit(frame, &cam->flags); clear_bit(CF_DMA_ACTIVE, &cam->flags); cam->next_buf = frame; cam->buf_seq[frame] = ++(cam->sequence); cam->frame_state.frames++; /* * "This should never happen" */ if (cam->state != S_STREAMING) return; /* * Process the frame and set up the next one. */ cam->frame_complete(cam, frame); } /* * The interrupt handler; this needs to be called from the * platform irq handler with the lock held. */ int mccic_irq(struct mcam_camera *cam, unsigned int irqs) { unsigned int frame, handled = 0; mcam_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); /* Clear'em all */ /* * Handle any frame completions. There really should * not be more than one of these, or we have fallen * far behind. * * When running in S/G mode, the frame number lacks any * real meaning - there's only one descriptor array - but * the controller still picks a different one to signal * each time. */ for (frame = 0; frame < cam->nbufs; frame++) if (irqs & (IRQ_EOF0 << frame)) { mcam_frame_complete(cam, frame); handled = 1; if (cam->buffer_mode == B_DMA_sg) break; } /* * If a frame starts, note that we have DMA active. This * code assumes that we won't get multiple frame interrupts * at once; may want to rethink that. */ if (irqs & (IRQ_SOF0 | IRQ_SOF1 | IRQ_SOF2)) { set_bit(CF_DMA_ACTIVE, &cam->flags); handled = 1; if (cam->buffer_mode == B_DMA_sg) mcam_ctlr_stop(cam); } return handled; } /* ---------------------------------------------------------------------- */ /* * Registration and such. */ static struct ov7670_config sensor_cfg = { /* * Exclude QCIF mode, because it only captures a tiny portion * of the sensor FOV */ .min_width = 320, .min_height = 240, }; int mccic_register(struct mcam_camera *cam) { struct i2c_board_info ov7670_info = { .type = "ov7670", .addr = 0x42 >> 1, .platform_data = &sensor_cfg, }; int ret; /* * Validate the requested buffer mode. */ if (buffer_mode >= 0) cam->buffer_mode = buffer_mode; if (cam->buffer_mode == B_DMA_sg && cam->chip_id == V4L2_IDENT_CAFE) { printk(KERN_ERR "marvell-cam: Cafe can't do S/G I/O, " "attempting vmalloc mode instead\n"); cam->buffer_mode = B_vmalloc; } if (!mcam_buffer_mode_supported(cam->buffer_mode)) { printk(KERN_ERR "marvell-cam: buffer mode %d unsupported\n", cam->buffer_mode); return -EINVAL; } /* * Register with V4L */ ret = v4l2_device_register(cam->dev, &cam->v4l2_dev); if (ret) return ret; mutex_init(&cam->s_mutex); cam->state = S_NOTREADY; mcam_set_config_needed(cam, 1); cam->pix_format = mcam_def_pix_format; cam->mbus_code = mcam_def_mbus_code; INIT_LIST_HEAD(&cam->buffers); mcam_ctlr_init(cam); /* * Try to find the sensor. */ sensor_cfg.clock_speed = cam->clock_speed; sensor_cfg.use_smbus = cam->use_smbus; cam->sensor_addr = ov7670_info.addr; cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, cam->i2c_adapter, &ov7670_info, NULL); if (cam->sensor == NULL) { ret = -ENODEV; goto out_unregister; } ret = mcam_cam_init(cam); if (ret) goto out_unregister; /* * Get the v4l2 setup done. */ ret = v4l2_ctrl_handler_init(&cam->ctrl_handler, 10); if (ret) goto out_unregister; cam->v4l2_dev.ctrl_handler = &cam->ctrl_handler; mutex_lock(&cam->s_mutex); cam->vdev = mcam_v4l_template; cam->vdev.debug = 0; cam->vdev.v4l2_dev = &cam->v4l2_dev; video_set_drvdata(&cam->vdev, cam); ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1); if (ret) goto out; /* * If so requested, try to get our DMA buffers now. */ if (cam->buffer_mode == B_vmalloc && !alloc_bufs_at_read) { if (mcam_alloc_dma_bufs(cam, 1)) cam_warn(cam, "Unable to alloc DMA buffers at load" " will try again later."); } out: v4l2_ctrl_handler_free(&cam->ctrl_handler); mutex_unlock(&cam->s_mutex); return ret; out_unregister: v4l2_device_unregister(&cam->v4l2_dev); return ret; } void mccic_shutdown(struct mcam_camera *cam) { /* * If we have no users (and we really, really should have no * users) the device will already be powered down. Trying to * take it down again will wedge the machine, which is frowned * upon. */ if (cam->users > 0) { cam_warn(cam, "Removing a device with users!\n"); mcam_ctlr_power_down(cam); } vb2_queue_release(&cam->vb_queue); if (cam->buffer_mode == B_vmalloc) mcam_free_dma_bufs(cam); video_unregister_device(&cam->vdev); v4l2_ctrl_handler_free(&cam->ctrl_handler); v4l2_device_unregister(&cam->v4l2_dev); } /* * Power management */ #ifdef CONFIG_PM void mccic_suspend(struct mcam_camera *cam) { mutex_lock(&cam->s_mutex); if (cam->users > 0) { enum mcam_state cstate = cam->state; mcam_ctlr_stop_dma(cam); mcam_ctlr_power_down(cam); cam->state = cstate; } mutex_unlock(&cam->s_mutex); } int mccic_resume(struct mcam_camera *cam) { int ret = 0; mutex_lock(&cam->s_mutex); if (cam->users > 0) { mcam_ctlr_power_up(cam); __mcam_cam_reset(cam); } else { mcam_ctlr_power_down(cam); } mutex_unlock(&cam->s_mutex); set_bit(CF_CONFIG_NEEDED, &cam->flags); if (cam->state == S_STREAMING) { /* * If there was a buffer in the DMA engine at suspend * time, put it back on the queue or we'll forget about it. */ if (cam->buffer_mode == B_DMA_sg && cam->vb_bufs[0]) list_add(&cam->vb_bufs[0]->queue, &cam->buffers); ret = mcam_read_setup(cam); } return ret; } #endif /* CONFIG_PM */