--- /dev/null
+/*
+ * 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/vmalloc.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-ctrls.h>
+#include <media/ov7670.h>
+#include <media/videobuf2-vmalloc.h>
+#include <media/videobuf2-dma-contig.h>
+#include <media/videobuf2-dma-sg.h>
+
+#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;
+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 CF_FRAME_SOF0 7 /* Frame 0 started */
+#define CF_FRAME_SOF1 8
+#define CF_FRAME_SOF2 9
+
+#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 */
+ bool planar;
+ u32 mbus_code;
+} mcam_formats[] = {
+ {
+ .desc = "YUYV 4:2:2",
+ .pixelformat = V4L2_PIX_FMT_YUYV,
+ .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
+ .bpp = 2,
+ .planar = false,
+ },
+ {
+ .desc = "YVYU 4:2:2",
+ .pixelformat = V4L2_PIX_FMT_YVYU,
+ .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
+ .bpp = 2,
+ .planar = false,
+ },
+ {
+ .desc = "YUV 4:2:2 PLANAR",
+ .pixelformat = V4L2_PIX_FMT_YUV422P,
+ .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
+ .bpp = 2,
+ .planar = true,
+ },
+ {
+ .desc = "YUV 4:2:0 PLANAR",
+ .pixelformat = V4L2_PIX_FMT_YUV420,
+ .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
+ .bpp = 2,
+ .planar = true,
+ },
+ {
+ .desc = "YVU 4:2:0 PLANAR",
+ .pixelformat = V4L2_PIX_FMT_YVU420,
+ .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
+ .bpp = 2,
+ .planar = true,
+ },
+ {
+ .desc = "RGB 444",
+ .pixelformat = V4L2_PIX_FMT_RGB444,
+ .mbus_code = MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE,
+ .bpp = 2,
+ .planar = false,
+ },
+ {
+ .desc = "RGB 565",
+ .pixelformat = V4L2_PIX_FMT_RGB565,
+ .mbus_code = MEDIA_BUS_FMT_RGB565_2X8_LE,
+ .bpp = 2,
+ .planar = false,
+ },
+ {
+ .desc = "Raw RGB Bayer",
+ .pixelformat = V4L2_PIX_FMT_SBGGR8,
+ .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
+ .bpp = 1,
+ .planar = false,
+ },
+};
+#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 u32 mcam_def_mbus_code = MEDIA_BUS_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;
+};
+
+struct yuv_pointer_t {
+ dma_addr_t y;
+ dma_addr_t u;
+ dma_addr_t v;
+};
+
+/*
+ * 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 */
+ struct yuv_pointer_t yuv_p;
+};
+
+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);
+ clear_bit(CF_FRAME_SOF0 + 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);
+}
+
+static void mcam_enable_mipi(struct mcam_camera *mcam)
+{
+ /* Using MIPI mode and enable MIPI */
+ cam_dbg(mcam, "camera: DPHY3=0x%x, DPHY5=0x%x, DPHY6=0x%x\n",
+ mcam->dphy[0], mcam->dphy[1], mcam->dphy[2]);
+ mcam_reg_write(mcam, REG_CSI2_DPHY3, mcam->dphy[0]);
+ mcam_reg_write(mcam, REG_CSI2_DPHY5, mcam->dphy[1]);
+ mcam_reg_write(mcam, REG_CSI2_DPHY6, mcam->dphy[2]);
+
+ if (!mcam->mipi_enabled) {
+ if (mcam->lane > 4 || mcam->lane <= 0) {
+ cam_warn(mcam, "lane number error\n");
+ mcam->lane = 1; /* set the default value */
+ }
+ /*
+ * 0x41 actives 1 lane
+ * 0x43 actives 2 lanes
+ * 0x45 actives 3 lanes (never happen)
+ * 0x47 actives 4 lanes
+ */
+ mcam_reg_write(mcam, REG_CSI2_CTRL0,
+ CSI2_C0_MIPI_EN | CSI2_C0_ACT_LANE(mcam->lane));
+ mcam_reg_write(mcam, REG_CLKCTRL,
+ (mcam->mclk_src << 29) | mcam->mclk_div);
+
+ mcam->mipi_enabled = true;
+ }
+}
+
+static void mcam_disable_mipi(struct mcam_camera *mcam)
+{
+ /* Using Parallel mode or disable MIPI */
+ mcam_reg_write(mcam, REG_CSI2_CTRL0, 0x0);
+ mcam_reg_write(mcam, REG_CSI2_DPHY3, 0x0);
+ mcam_reg_write(mcam, REG_CSI2_DPHY5, 0x0);
+ mcam_reg_write(mcam, REG_CSI2_DPHY6, 0x0);
+ mcam->mipi_enabled = false;
+}
+
+/* ------------------------------------------------------------------- */
+
+#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 == MCAM_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.
+ */
+
+static bool mcam_fmt_is_planar(__u32 pfmt)
+{
+ struct mcam_format_struct *f;
+
+ f = mcam_find_format(pfmt);
+ return f->planar;
+}
+
+/*
+ * 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;
+ struct v4l2_pix_format *fmt = &cam->pix_format;
+ dma_addr_t dma_handle;
+ u32 pixel_count = fmt->width * fmt->height;
+ struct vb2_buffer *vb;
+
+ /*
+ * If there are no available buffers, go into single mode
+ */
+ if (list_empty(&cam->buffers)) {
+ buf = cam->vb_bufs[frame ^ 0x1];
+ set_bit(CF_SINGLE_BUFFER, &cam->flags);
+ cam->frame_state.singles++;
+ } else {
+ /*
+ * OK, we have a buffer we can use.
+ */
+ buf = list_first_entry(&cam->buffers, struct mcam_vb_buffer,
+ queue);
+ list_del_init(&buf->queue);
+ clear_bit(CF_SINGLE_BUFFER, &cam->flags);
+ }
+
+ cam->vb_bufs[frame] = buf;
+ vb = &buf->vb_buf;
+
+ dma_handle = vb2_dma_contig_plane_dma_addr(vb, 0);
+ buf->yuv_p.y = dma_handle;
+
+ switch (cam->pix_format.pixelformat) {
+ case V4L2_PIX_FMT_YUV422P:
+ buf->yuv_p.u = buf->yuv_p.y + pixel_count;
+ buf->yuv_p.v = buf->yuv_p.u + pixel_count / 2;
+ break;
+ case V4L2_PIX_FMT_YUV420:
+ buf->yuv_p.u = buf->yuv_p.y + pixel_count;
+ buf->yuv_p.v = buf->yuv_p.u + pixel_count / 4;
+ break;
+ case V4L2_PIX_FMT_YVU420:
+ buf->yuv_p.v = buf->yuv_p.y + pixel_count;
+ buf->yuv_p.u = buf->yuv_p.v + pixel_count / 4;
+ break;
+ default:
+ break;
+ }
+
+ mcam_reg_write(cam, frame == 0 ? REG_Y0BAR : REG_Y1BAR, buf->yuv_p.y);
+ if (mcam_fmt_is_planar(fmt->pixelformat)) {
+ mcam_reg_write(cam, frame == 0 ?
+ REG_U0BAR : REG_U1BAR, buf->yuv_p.u);
+ mcam_reg_write(cam, frame == 0 ?
+ REG_V0BAR : REG_V1BAR, buf->yuv_p.v);
+ }
+}
+
+/*
+ * 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)
+{
+ struct v4l2_pix_format *fmt = &cam->pix_format;
+ u32 widthy = 0, widthuv = 0, imgsz_h, imgsz_w;
+
+ cam_dbg(cam, "camera: bytesperline = %d; height = %d\n",
+ fmt->bytesperline, fmt->sizeimage / fmt->bytesperline);
+ imgsz_h = (fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK;
+ imgsz_w = (fmt->width * 2) & IMGSZ_H_MASK;
+
+ switch (fmt->pixelformat) {
+ case V4L2_PIX_FMT_YUYV:
+ case V4L2_PIX_FMT_YVYU:
+ widthy = fmt->width * 2;
+ widthuv = 0;
+ break;
+ case V4L2_PIX_FMT_JPEG:
+ imgsz_h = (fmt->sizeimage / fmt->bytesperline) << IMGSZ_V_SHIFT;
+ widthy = fmt->bytesperline;
+ widthuv = 0;
+ break;
+ case V4L2_PIX_FMT_YUV422P:
+ case V4L2_PIX_FMT_YUV420:
+ case V4L2_PIX_FMT_YVU420:
+ widthy = fmt->width;
+ widthuv = fmt->width / 2;
+ break;
+ default:
+ widthy = fmt->bytesperline;
+ widthuv = 0;
+ }
+
+ mcam_reg_write_mask(cam, REG_IMGPITCH, widthuv << 16 | widthy,
+ IMGP_YP_MASK | IMGP_UVP_MASK);
+ mcam_reg_write(cam, REG_IMGSIZE, imgsz_h | imgsz_w);
+ mcam_reg_write(cam, REG_IMGOFFSET, 0x0);
+
+ /*
+ * Tell the controller about the image format we are using.
+ */
+ switch (fmt->pixelformat) {
+ case V4L2_PIX_FMT_YUV422P:
+ mcam_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_YUV | C0_YUV_PLANAR | C0_YUVE_YVYU, C0_DF_MASK);
+ break;
+ case V4L2_PIX_FMT_YUV420:
+ case V4L2_PIX_FMT_YVU420:
+ mcam_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_YUV | C0_YUV_420PL | C0_YUVE_VYUY, C0_DF_MASK);
+ break;
+ case V4L2_PIX_FMT_YUYV:
+ mcam_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_YUV | C0_YUV_PACKED | C0_YUVE_NOSWAP, C0_DF_MASK);
+ break;
+ case V4L2_PIX_FMT_YVYU:
+ mcam_reg_write_mask(cam, REG_CTRL0,
+ C0_DF_YUV | C0_YUV_PACKED | C0_YUVE_SWAP24, C0_DF_MASK);
+ break;
+ case V4L2_PIX_FMT_JPEG:
+ 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, "camera: unknown format: %#x\n", fmt->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);
+ /*
+ * This field controls the generation of EOF(DVP only)
+ */
+ if (cam->bus_type != V4L2_MBUS_CSI2)
+ mcam_reg_set_bit(cam, REG_CTRL0,
+ C0_EOF_VSYNC | C0_VEDGE_CTRL);
+}
+
+
+/*
+ * 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 int mcam_ctlr_power_up(struct mcam_camera *cam)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&cam->dev_lock, flags);
+ ret = cam->plat_power_up(cam);
+ if (ret) {
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ return ret;
+ }
+ mcam_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN);
+ spin_unlock_irqrestore(&cam->dev_lock, flags);
+ msleep(5); /* Just to be sure */
+ return 0;
+}
+
+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)
+{
+ 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);
+ /* Get/set parameters? */
+ cam->state = S_IDLE;
+ 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);
+ /*
+ * Update CSI2_DPHY value
+ */
+ if (cam->calc_dphy)
+ cam->calc_dphy(cam);
+ cam_dbg(cam, "camera: DPHY sets: dphy3=0x%x, dphy5=0x%x, dphy6=0x%x\n",
+ cam->dphy[0], cam->dphy[1], cam->dphy[2]);
+ if (cam->bus_type == V4L2_MBUS_CSI2)
+ mcam_enable_mipi(cam);
+ else
+ mcam_disable_mipi(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;
+ else if (cam->buffer_mode == B_DMA_sg)
+ alloc_ctxs[0] = cam->vb_alloc_ctx_sg;
+ 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);
+}
+
+/*
+ * 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);
+ unsigned int frame;
+
+ 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;
+ }
+
+ /*
+ * Ensure clear the left over frame flags
+ * before every really start streaming
+ */
+ for (frame = 0; frame < cam->nbufs; frame++)
+ clear_bit(CF_FRAME_SOF0 + frame, &cam->flags);
+
+ return mcam_read_setup(cam);
+}
+
+static void 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;
+ }
+ if (cam->state != S_STREAMING)
+ return;
+ mcam_ctlr_stop_dma(cam);
+ /*
+ * Reset the CCIC PHY after stopping streaming,
+ * otherwise, the CCIC may be unstable.
+ */
+ if (cam->ctlr_reset)
+ cam->ctlr_reset(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);
+}
+
+
+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 = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_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 sg_table *sg_table = vb2_dma_sg_plane_desc(vb, 0);
+ struct mcam_dma_desc *desc = mvb->dma_desc;
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sg_table->sgl, sg, sg_table->nents, i) {
+ desc->dma_addr = sg_dma_address(sg);
+ desc->segment_len = sg_dma_len(sg);
+ desc++;
+ }
+ 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_cleanup = mcam_vb_sg_buf_cleanup,
+ .start_streaming = mcam_vb_start_streaming,
+ .stop_streaming = mcam_vb_stop_streaming,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_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;
+ vq->lock = &cam->s_mutex;
+ 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;
+ vq->buf_struct_size = sizeof(struct mcam_vb_buffer);
+ vq->io_modes = VB2_MMAP | VB2_USERPTR;
+ cam->dma_setup = mcam_ctlr_dma_contig;
+ cam->frame_complete = mcam_dma_contig_done;
+ cam->vb_alloc_ctx = vb2_dma_contig_init_ctx(cam->dev);
+ if (IS_ERR(cam->vb_alloc_ctx))
+ return PTR_ERR(cam->vb_alloc_ctx);
+#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->buf_struct_size = sizeof(struct mcam_vb_buffer);
+ vq->io_modes = VB2_MMAP | VB2_USERPTR;
+ cam->dma_setup = mcam_ctlr_dma_sg;
+ cam->frame_complete = mcam_dma_sg_done;
+ cam->vb_alloc_ctx_sg = vb2_dma_sg_init_ctx(cam->dev);
+ if (IS_ERR(cam->vb_alloc_ctx_sg))
+ return PTR_ERR(cam->vb_alloc_ctx_sg);
+#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
+#ifdef MCAM_MODE_DMA_SG
+ if (cam->buffer_mode == B_DMA_sg)
+ vb2_dma_sg_cleanup_ctx(cam->vb_alloc_ctx_sg);
+#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->device_caps = V4L2_CAP_VIDEO_CAPTURE |
+ V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
+ cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
+ 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);
+ switch (f->pixelformat) {
+ case V4L2_PIX_FMT_YUV420:
+ case V4L2_PIX_FMT_YVU420:
+ pix->bytesperline = pix->width * 3 / 2;
+ break;
+ default:
+ pix->bytesperline = pix->width * f->bpp;
+ break;
+ }
+ 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;
+}
+
+static int mcam_vidioc_g_std(struct file *filp, void *priv, v4l2_std_id *a)
+{
+ *a = V4L2_STD_NTSC_M;
+ 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_enum_framesizes(struct file *filp, void *priv,
+ struct v4l2_frmsizeenum *sizes)
+{
+ struct mcam_camera *cam = priv;
+ struct mcam_format_struct *f;
+ struct v4l2_subdev_frame_size_enum fse = {
+ .index = sizes->index,
+ .which = V4L2_SUBDEV_FORMAT_ACTIVE,
+ };
+ int ret;
+
+ f = mcam_find_format(sizes->pixel_format);
+ if (f->pixelformat != sizes->pixel_format)
+ return -EINVAL;
+ fse.code = f->mbus_code;
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, pad, enum_frame_size, NULL, &fse);
+ mutex_unlock(&cam->s_mutex);
+ if (ret)
+ return ret;
+ if (fse.min_width == fse.max_width &&
+ fse.min_height == fse.max_height) {
+ sizes->type = V4L2_FRMSIZE_TYPE_DISCRETE;
+ sizes->discrete.width = fse.min_width;
+ sizes->discrete.height = fse.min_height;
+ return 0;
+ }
+ sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
+ sizes->stepwise.min_width = fse.min_width;
+ sizes->stepwise.max_width = fse.max_width;
+ sizes->stepwise.min_height = fse.min_height;
+ sizes->stepwise.max_height = fse.max_height;
+ sizes->stepwise.step_width = 1;
+ sizes->stepwise.step_height = 1;
+ return 0;
+}
+
+static int mcam_vidioc_enum_frameintervals(struct file *filp, void *priv,
+ struct v4l2_frmivalenum *interval)
+{
+ struct mcam_camera *cam = priv;
+ struct mcam_format_struct *f;
+ struct v4l2_subdev_frame_interval_enum fie = {
+ .index = interval->index,
+ .width = interval->width,
+ .height = interval->height,
+ .which = V4L2_SUBDEV_FORMAT_ACTIVE,
+ };
+ int ret;
+
+ f = mcam_find_format(interval->pixel_format);
+ if (f->pixelformat != interval->pixel_format)
+ return -EINVAL;
+ fie.code = f->mbus_code;
+ mutex_lock(&cam->s_mutex);
+ ret = sensor_call(cam, pad, enum_frame_interval, NULL, &fie);
+ mutex_unlock(&cam->s_mutex);
+ if (ret)
+ return ret;
+ interval->type = V4L2_FRMIVAL_TYPE_DISCRETE;
+ interval->discrete = fie.interval;
+ return 0;
+}
+
+#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 (reg->reg > cam->regs_size - 4)
+ return -EINVAL;
+ reg->val = mcam_reg_read(cam, reg->reg);
+ reg->size = 4;
+ return 0;
+}
+
+static int mcam_vidioc_s_register(struct file *file, void *priv,
+ const struct v4l2_dbg_register *reg)
+{
+ struct mcam_camera *cam = priv;
+
+ if (reg->reg > cam->regs_size - 4)
+ return -EINVAL;
+ mcam_reg_write(cam, reg->reg, reg->val);
+ return 0;
+}
+#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_g_std = mcam_vidioc_g_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,
+#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;
+ ret = mcam_ctlr_power_up(cam);
+ if (ret)
+ goto out;
+ __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_disable_mipi(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,
+
+ .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) &&
+ test_bit(CF_FRAME_SOF0 + frame, &cam->flags)) {
+ mcam_frame_complete(cam, frame);
+ handled = 1;
+ clear_bit(CF_FRAME_SOF0 + frame, &cam->flags);
+ 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.
+ */
+ for (frame = 0; frame < cam->nbufs; frame++) {
+ if (irqs & (IRQ_SOF0 << frame)) {
+ set_bit(CF_FRAME_SOF0 + frame, &cam->flags);
+ handled = IRQ_HANDLED;
+ }
+ }
+
+ if (handled == IRQ_HANDLED) {
+ set_bit(CF_DMA_ACTIVE, &cam->flags);
+ 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 == MCAM_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.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) {
+ ret = mcam_ctlr_power_up(cam);
+ if (ret) {
+ mutex_unlock(&cam->s_mutex);
+ return ret;
+ }
+ __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 */
Code Review / kvmfornfv.git / blobdiff