diff options
| -rw-r--r-- | drivers/dma/omap-dma.c | 69 |
1 files changed, 64 insertions, 5 deletions
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c index fe33ddd8eb0f..82a7ac7c048b 100644 --- a/drivers/dma/omap-dma.c +++ b/drivers/dma/omap-dma.c @@ -194,14 +194,73 @@ static void omap_dma_free_chan_resources(struct dma_chan *chan) dev_info(c->vc.chan.device->dev, "freeing channel for %u\n", c->dma_sig); } +static size_t omap_dma_sg_size(struct omap_sg *sg) +{ + return sg->en * sg->fn; +} + +static size_t omap_dma_desc_size(struct omap_desc *d) +{ + unsigned i; + size_t size; + + for (size = i = 0; i < d->sglen; i++) + size += omap_dma_sg_size(&d->sg[i]); + + return size * es_bytes[d->es]; +} + +static size_t omap_dma_desc_size_pos(struct omap_desc *d, dma_addr_t addr) +{ + unsigned i; + size_t size, es_size = es_bytes[d->es]; + + for (size = i = 0; i < d->sglen; i++) { + size_t this_size = omap_dma_sg_size(&d->sg[i]) * es_size; + + if (size) + size += this_size; + else if (addr >= d->sg[i].addr && + addr < d->sg[i].addr + this_size) + size += d->sg[i].addr + this_size - addr; + } + return size; +} + static enum dma_status omap_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate) { - /* - * FIXME: do we need to return pending bytes? - * We have no users of that info at the moment... - */ - return dma_cookie_status(chan, cookie, txstate); + struct omap_chan *c = to_omap_dma_chan(chan); + struct virt_dma_desc *vd; + enum dma_status ret; + unsigned long flags; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_SUCCESS || !txstate) + return ret; + + spin_lock_irqsave(&c->vc.lock, flags); + vd = vchan_find_desc(&c->vc, cookie); + if (vd) { + txstate->residue = omap_dma_desc_size(to_omap_dma_desc(&vd->tx)); + } else if (c->desc && c->desc->vd.tx.cookie == cookie) { + struct omap_desc *d = c->desc; + dma_addr_t pos; + + if (d->dir == DMA_MEM_TO_DEV) + pos = omap_get_dma_src_pos(c->dma_ch); + else if (d->dir == DMA_DEV_TO_MEM) + pos = omap_get_dma_dst_pos(c->dma_ch); + else + pos = 0; + + txstate->residue = omap_dma_desc_size_pos(d, pos); + } else { + txstate->residue = 0; + } + spin_unlock_irqrestore(&c->vc.lock, flags); + + return ret; } static void omap_dma_issue_pending(struct dma_chan *chan) |