diff options
Diffstat (limited to 'drivers/media/pci/tw686x/tw686x-video.c')
| -rw-r--r-- | drivers/media/pci/tw686x/tw686x-video.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/media/pci/tw686x/tw686x-video.c b/drivers/media/pci/tw686x/tw686x-video.c index b5cb385e4cb1..0e839f617e03 100644 --- a/drivers/media/pci/tw686x/tw686x-video.c +++ b/drivers/media/pci/tw686x/tw686x-video.c @@ -20,6 +20,7 @@ #include <media/v4l2-common.h> #include <media/v4l2-event.h> #include <media/videobuf2-dma-contig.h> +#include <media/videobuf2-dma-sg.h> #include <media/videobuf2-vmalloc.h> #include "tw686x.h" #include "tw686x-regs.h" @@ -28,6 +29,10 @@ #define TW686X_VIDEO_WIDTH 720 #define TW686X_VIDEO_HEIGHT(id) ((id & V4L2_STD_525_60) ? 480 : 576) +#define TW686X_MAX_SG_ENTRY_SIZE 4096 +#define TW686X_MAX_SG_DESC_COUNT 256 /* PAL 720x576 needs 203 4-KB pages */ +#define TW686X_SG_TABLE_SIZE (TW686X_MAX_SG_DESC_COUNT * sizeof(struct tw686x_sg_desc)) + static const struct tw686x_format formats[] = { { .fourcc = V4L2_PIX_FMT_UYVY, @@ -196,6 +201,174 @@ const struct tw686x_dma_ops contig_dma_ops = { .field = V4L2_FIELD_INTERLACED, }; +static int tw686x_sg_desc_fill(struct tw686x_sg_desc *descs, + struct tw686x_v4l2_buf *buf, + unsigned int buf_len) +{ + struct sg_table *vbuf = vb2_dma_sg_plane_desc(&buf->vb.vb2_buf, 0); + unsigned int len, entry_len; + struct scatterlist *sg; + int i, count; + + /* Clear the scatter-gather table */ + memset(descs, 0, TW686X_SG_TABLE_SIZE); + + count = 0; + for_each_sg(vbuf->sgl, sg, vbuf->nents, i) { + dma_addr_t phys = sg_dma_address(sg); + len = sg_dma_len(sg); + + while (len && buf_len) { + + if (count == TW686X_MAX_SG_DESC_COUNT) + return -ENOMEM; + + entry_len = min_t(unsigned int, len, + TW686X_MAX_SG_ENTRY_SIZE); + entry_len = min_t(unsigned int, entry_len, buf_len); + descs[count].phys = cpu_to_le32(phys); + descs[count++].flags_length = + cpu_to_le32(BIT(30) | entry_len); + phys += entry_len; + len -= entry_len; + buf_len -= entry_len; + } + + if (!buf_len) + return 0; + } + + return -ENOMEM; +} + +static void tw686x_sg_buf_refill(struct tw686x_video_channel *vc, + unsigned int pb) +{ + struct tw686x_dev *dev = vc->dev; + struct tw686x_v4l2_buf *buf; + + while (!list_empty(&vc->vidq_queued)) { + unsigned int buf_len; + + buf = list_first_entry(&vc->vidq_queued, + struct tw686x_v4l2_buf, list); + list_del(&buf->list); + + buf_len = (vc->width * vc->height * vc->format->depth) >> 3; + if (tw686x_sg_desc_fill(vc->sg_descs[pb], buf, buf_len)) { + v4l2_err(&dev->v4l2_dev, + "dma%d: unable to fill %s-buffer\n", + vc->ch, pb ? "B" : "P"); + vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); + continue; + } + + buf->vb.vb2_buf.state = VB2_BUF_STATE_ACTIVE; + vc->curr_bufs[pb] = buf; + return; + } + + vc->curr_bufs[pb] = NULL; +} + +static void tw686x_sg_dma_free(struct tw686x_video_channel *vc, + unsigned int pb) +{ + struct tw686x_dma_desc *desc = &vc->dma_descs[pb]; + struct tw686x_dev *dev = vc->dev; + + if (desc->size) { + pci_free_consistent(dev->pci_dev, desc->size, + desc->virt, desc->phys); + desc->virt = NULL; + } + + vc->sg_descs[pb] = NULL; +} + +static int tw686x_sg_dma_alloc(struct tw686x_video_channel *vc, + unsigned int pb) +{ + struct tw686x_dma_desc *desc = &vc->dma_descs[pb]; + struct tw686x_dev *dev = vc->dev; + u32 reg = pb ? DMA_PAGE_TABLE1_ADDR[vc->ch] : + DMA_PAGE_TABLE0_ADDR[vc->ch]; + void *virt; + + if (desc->size) { + + virt = pci_alloc_consistent(dev->pci_dev, desc->size, + &desc->phys); + if (!virt) { + v4l2_err(&dev->v4l2_dev, + "dma%d: unable to allocate %s-buffer\n", + vc->ch, pb ? "B" : "P"); + return -ENOMEM; + } + desc->virt = virt; + reg_write(dev, reg, desc->phys); + } else { + virt = dev->video_channels[0].dma_descs[pb].virt + + vc->ch * TW686X_SG_TABLE_SIZE; + } + + vc->sg_descs[pb] = virt; + return 0; +} + +static void tw686x_sg_cleanup(struct tw686x_dev *dev) +{ + vb2_dma_sg_cleanup_ctx(dev->alloc_ctx); +} + +static int tw686x_sg_setup(struct tw686x_dev *dev) +{ + unsigned int sg_table_size, pb, ch, channels; + + dev->alloc_ctx = vb2_dma_sg_init_ctx(&dev->pci_dev->dev); + if (IS_ERR(dev->alloc_ctx)) { + dev_err(&dev->pci_dev->dev, "unable to init DMA context\n"); + return PTR_ERR(dev->alloc_ctx); + } + + if (is_second_gen(dev)) { + /* + * TW6865/TW6869: each channel needs a pair of + * P-B descriptor tables. + */ + channels = max_channels(dev); + sg_table_size = TW686X_SG_TABLE_SIZE; + } else { + /* + * TW6864/TW6868: we need to allocate a pair of + * P-B descriptor tables, common for all channels. + * Each table will be bigger than 4 KB. + */ + channels = 1; + sg_table_size = max_channels(dev) * TW686X_SG_TABLE_SIZE; + } + + for (ch = 0; ch < channels; ch++) { + struct tw686x_video_channel *vc = &dev->video_channels[ch]; + + for (pb = 0; pb < 2; pb++) + vc->dma_descs[pb].size = sg_table_size; + } + + return 0; +} + +const struct tw686x_dma_ops sg_dma_ops = { + .setup = tw686x_sg_setup, + .cleanup = tw686x_sg_cleanup, + .alloc = tw686x_sg_dma_alloc, + .free = tw686x_sg_dma_free, + .buf_refill = tw686x_sg_buf_refill, + .mem_ops = &vb2_dma_sg_memops, + .hw_dma_mode = TW686X_SG_MODE, + .field = V4L2_FIELD_SEQ_TB, +}; + static unsigned int tw686x_fields_map(v4l2_std_id std, unsigned int fps) { static const unsigned int map[15] = { @@ -554,6 +727,19 @@ static int tw686x_s_fmt_vid_cap(struct file *file, void *priv, else val &= ~BIT(24); + val &= ~0x7ffff; + + /* Program the DMA scatter-gather */ + if (dev->dma_mode == TW686X_DMA_MODE_SG) { + u32 start_idx, end_idx; + + start_idx = is_second_gen(dev) ? + 0 : vc->ch * TW686X_MAX_SG_DESC_COUNT; + end_idx = start_idx + TW686X_MAX_SG_DESC_COUNT - 1; + + val |= (end_idx << 10) | start_idx; + } + val &= ~(0x7 << 20); val |= vc->format->mode << 20; reg_write(vc->dev, VDMA_CHANNEL_CONFIG[vc->ch], val); @@ -891,6 +1077,8 @@ int tw686x_video_init(struct tw686x_dev *dev) dev->dma_ops = &memcpy_dma_ops; else if (dev->dma_mode == TW686X_DMA_MODE_CONTIG) dev->dma_ops = &contig_dma_ops; + else if (dev->dma_mode == TW686X_DMA_MODE_SG) + dev->dma_ops = &sg_dma_ops; else return -EINVAL; |