diff options
Diffstat (limited to 'drivers/dma/edma.c')
| -rw-r--r-- | drivers/dma/edma.c | 335 |
1 files changed, 260 insertions, 75 deletions
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 926360c..d08c4de 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -57,14 +57,48 @@ #define EDMA_MAX_SLOTS MAX_NR_SG #define EDMA_DESCRIPTORS 16 +struct edma_pset { + u32 len; + dma_addr_t addr; + struct edmacc_param param; +}; + struct edma_desc { struct virt_dma_desc vdesc; struct list_head node; + enum dma_transfer_direction direction; int cyclic; int absync; int pset_nr; + struct edma_chan *echan; int processed; - struct edmacc_param pset[0]; + + /* + * The following 4 elements are used for residue accounting. + * + * - processed_stat: the number of SG elements we have traversed + * so far to cover accounting. This is updated directly to processed + * during edma_callback and is always <= processed, because processed + * refers to the number of pending transfer (programmed to EDMA + * controller), where as processed_stat tracks number of transfers + * accounted for so far. + * + * - residue: The amount of bytes we have left to transfer for this desc + * + * - residue_stat: The residue in bytes of data we have covered + * so far for accounting. This is updated directly to residue + * during callbacks to keep it current. + * + * - sg_len: Tracks the length of the current intermediate transfer, + * this is required to update the residue during intermediate transfer + * completion callback. + */ + int processed_stat; + u32 sg_len; + u32 residue; + u32 residue_stat; + + struct edma_pset pset[0]; }; struct edma_cc; @@ -136,12 +170,14 @@ static void edma_execute(struct edma_chan *echan) /* Find out how many left */ left = edesc->pset_nr - edesc->processed; nslots = min(MAX_NR_SG, left); + edesc->sg_len = 0; /* Write descriptor PaRAM set(s) */ for (i = 0; i < nslots; i++) { j = i + edesc->processed; - edma_write_slot(echan->slot[i], &edesc->pset[j]); - dev_dbg(echan->vchan.chan.device->dev, + edma_write_slot(echan->slot[i], &edesc->pset[j].param); + edesc->sg_len += edesc->pset[j].len; + dev_vdbg(echan->vchan.chan.device->dev, "\n pset[%d]:\n" " chnum\t%d\n" " slot\t%d\n" @@ -154,14 +190,14 @@ static void edma_execute(struct edma_chan *echan) " cidx\t%08x\n" " lkrld\t%08x\n", j, echan->ch_num, echan->slot[i], - edesc->pset[j].opt, - edesc->pset[j].src, - edesc->pset[j].dst, - edesc->pset[j].a_b_cnt, - edesc->pset[j].ccnt, - edesc->pset[j].src_dst_bidx, - edesc->pset[j].src_dst_cidx, - edesc->pset[j].link_bcntrld); + edesc->pset[j].param.opt, + edesc->pset[j].param.src, + edesc->pset[j].param.dst, + edesc->pset[j].param.a_b_cnt, + edesc->pset[j].param.ccnt, + edesc->pset[j].param.src_dst_bidx, + edesc->pset[j].param.src_dst_cidx, + edesc->pset[j].param.link_bcntrld); /* Link to the previous slot if not the last set */ if (i != (nslots - 1)) edma_link(echan->slot[i], echan->slot[i+1]); @@ -183,7 +219,8 @@ static void edma_execute(struct edma_chan *echan) } if (edesc->processed <= MAX_NR_SG) { - dev_dbg(dev, "first transfer starting %d\n", echan->ch_num); + dev_dbg(dev, "first transfer starting on channel %d\n", + echan->ch_num); edma_start(echan->ch_num); } else { dev_dbg(dev, "chan: %d: completed %d elements, resuming\n", @@ -197,7 +234,7 @@ static void edma_execute(struct edma_chan *echan) * MAX_NR_SG */ if (echan->missed) { - dev_dbg(dev, "missed event in execute detected\n"); + dev_dbg(dev, "missed event on channel %d\n", echan->ch_num); edma_clean_channel(echan->ch_num); edma_stop(echan->ch_num); edma_start(echan->ch_num); @@ -242,6 +279,26 @@ static int edma_slave_config(struct edma_chan *echan, return 0; } +static int edma_dma_pause(struct edma_chan *echan) +{ + /* Pause/Resume only allowed with cyclic mode */ + if (!echan->edesc->cyclic) + return -EINVAL; + + edma_pause(echan->ch_num); + return 0; +} + +static int edma_dma_resume(struct edma_chan *echan) +{ + /* Pause/Resume only allowed with cyclic mode */ + if (!echan->edesc->cyclic) + return -EINVAL; + + edma_resume(echan->ch_num); + return 0; +} + static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg) { @@ -257,6 +314,14 @@ static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, config = (struct dma_slave_config *)arg; ret = edma_slave_config(echan, config); break; + case DMA_PAUSE: + ret = edma_dma_pause(echan); + break; + + case DMA_RESUME: + ret = edma_dma_resume(echan); + break; + default: ret = -ENOSYS; } @@ -275,18 +340,23 @@ static int edma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, * @dma_length: Total length of the DMA transfer * @direction: Direction of the transfer */ -static int edma_config_pset(struct dma_chan *chan, struct edmacc_param *pset, +static int edma_config_pset(struct dma_chan *chan, struct edma_pset *epset, dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst, enum dma_slave_buswidth dev_width, unsigned int dma_length, enum dma_transfer_direction direction) { struct edma_chan *echan = to_edma_chan(chan); struct device *dev = chan->device->dev; + struct edmacc_param *param = &epset->param; int acnt, bcnt, ccnt, cidx; int src_bidx, dst_bidx, src_cidx, dst_cidx; int absync; acnt = dev_width; + + /* src/dst_maxburst == 0 is the same case as src/dst_maxburst == 1 */ + if (!burst) + burst = 1; /* * If the maxburst is equal to the fifo width, use * A-synced transfers. This allows for large contiguous @@ -337,41 +407,50 @@ static int edma_config_pset(struct dma_chan *chan, struct edmacc_param *pset, cidx = acnt * bcnt; } + epset->len = dma_length; + if (direction == DMA_MEM_TO_DEV) { src_bidx = acnt; src_cidx = cidx; dst_bidx = 0; dst_cidx = 0; + epset->addr = src_addr; } else if (direction == DMA_DEV_TO_MEM) { src_bidx = 0; src_cidx = 0; dst_bidx = acnt; dst_cidx = cidx; + epset->addr = dst_addr; + } else if (direction == DMA_MEM_TO_MEM) { + src_bidx = acnt; + src_cidx = cidx; + dst_bidx = acnt; + dst_cidx = cidx; } else { dev_err(dev, "%s: direction not implemented yet\n", __func__); return -EINVAL; } - pset->opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num)); + param->opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num)); /* Configure A or AB synchronized transfers */ if (absync) - pset->opt |= SYNCDIM; + param->opt |= SYNCDIM; - pset->src = src_addr; - pset->dst = dst_addr; + param->src = src_addr; + param->dst = dst_addr; - pset->src_dst_bidx = (dst_bidx << 16) | src_bidx; - pset->src_dst_cidx = (dst_cidx << 16) | src_cidx; + param->src_dst_bidx = (dst_bidx << 16) | src_bidx; + param->src_dst_cidx = (dst_cidx << 16) | src_cidx; - pset->a_b_cnt = bcnt << 16 | acnt; - pset->ccnt = ccnt; + param->a_b_cnt = bcnt << 16 | acnt; + param->ccnt = ccnt; /* * Only time when (bcntrld) auto reload is required is for * A-sync case, and in this case, a requirement of reload value * of SZ_64K-1 only is assured. 'link' is initially set to NULL * and then later will be populated by edma_execute. */ - pset->link_bcntrld = 0xffffffff; + param->link_bcntrld = 0xffffffff; return absync; } @@ -401,23 +480,26 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg( dev_width = echan->cfg.dst_addr_width; burst = echan->cfg.dst_maxburst; } else { - dev_err(dev, "%s: bad direction?\n", __func__); + dev_err(dev, "%s: bad direction: %d\n", __func__, direction); return NULL; } if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) { - dev_err(dev, "Undefined slave buswidth\n"); + dev_err(dev, "%s: Undefined slave buswidth\n", __func__); return NULL; } edesc = kzalloc(sizeof(*edesc) + sg_len * sizeof(edesc->pset[0]), GFP_ATOMIC); if (!edesc) { - dev_dbg(dev, "Failed to allocate a descriptor\n"); + dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__); return NULL; } edesc->pset_nr = sg_len; + edesc->residue = 0; + edesc->direction = direction; + edesc->echan = echan; /* Allocate a PaRAM slot, if needed */ nslots = min_t(unsigned, MAX_NR_SG, sg_len); @@ -429,7 +511,8 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg( EDMA_SLOT_ANY); if (echan->slot[i] < 0) { kfree(edesc); - dev_err(dev, "Failed to allocate slot\n"); + dev_err(dev, "%s: Failed to allocate slot\n", + __func__); return NULL; } } @@ -452,16 +535,56 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg( } edesc->absync = ret; + edesc->residue += sg_dma_len(sg); /* If this is the last in a current SG set of transactions, enable interrupts so that next set is processed */ if (!((i+1) % MAX_NR_SG)) - edesc->pset[i].opt |= TCINTEN; + edesc->pset[i].param.opt |= TCINTEN; /* If this is the last set, enable completion interrupt flag */ if (i == sg_len - 1) - edesc->pset[i].opt |= TCINTEN; + edesc->pset[i].param.opt |= TCINTEN; } + edesc->residue_stat = edesc->residue; + + return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); +} + +struct dma_async_tx_descriptor *edma_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long tx_flags) +{ + int ret; + struct edma_desc *edesc; + struct device *dev = chan->device->dev; + struct edma_chan *echan = to_edma_chan(chan); + + if (unlikely(!echan || !len)) + return NULL; + + edesc = kzalloc(sizeof(*edesc) + sizeof(edesc->pset[0]), GFP_ATOMIC); + if (!edesc) { + dev_dbg(dev, "Failed to allocate a descriptor\n"); + return NULL; + } + + edesc->pset_nr = 1; + + ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1, + DMA_SLAVE_BUSWIDTH_4_BYTES, len, DMA_MEM_TO_MEM); + if (ret < 0) + return NULL; + + edesc->absync = ret; + + /* + * Enable intermediate transfer chaining to re-trigger channel + * on completion of every TR, and enable transfer-completion + * interrupt on completion of the whole transfer. + */ + edesc->pset[0].param.opt |= ITCCHEN; + edesc->pset[0].param.opt |= TCINTEN; return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); } @@ -493,12 +616,12 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( dev_width = echan->cfg.dst_addr_width; burst = echan->cfg.dst_maxburst; } else { - dev_err(dev, "%s: bad direction?\n", __func__); + dev_err(dev, "%s: bad direction: %d\n", __func__, direction); return NULL; } if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) { - dev_err(dev, "Undefined slave buswidth\n"); + dev_err(dev, "%s: Undefined slave buswidth\n", __func__); return NULL; } @@ -523,16 +646,18 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]), GFP_ATOMIC); if (!edesc) { - dev_dbg(dev, "Failed to allocate a descriptor\n"); + dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__); return NULL; } edesc->cyclic = 1; edesc->pset_nr = nslots; + edesc->residue = edesc->residue_stat = buf_len; + edesc->direction = direction; + edesc->echan = echan; - dev_dbg(dev, "%s: nslots=%d\n", __func__, nslots); - dev_dbg(dev, "%s: period_len=%d\n", __func__, period_len); - dev_dbg(dev, "%s: buf_len=%d\n", __func__, buf_len); + dev_dbg(dev, "%s: channel=%d nslots=%d period_len=%zu buf_len=%zu\n", + __func__, echan->ch_num, nslots, period_len, buf_len); for (i = 0; i < nslots; i++) { /* Allocate a PaRAM slot, if needed */ @@ -542,7 +667,8 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( EDMA_SLOT_ANY); if (echan->slot[i] < 0) { kfree(edesc); - dev_err(dev, "Failed to allocate slot\n"); + dev_err(dev, "%s: Failed to allocate slot\n", + __func__); return NULL; } } @@ -566,8 +692,8 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( else src_addr += period_len; - dev_dbg(dev, "%s: Configure period %d of buf:\n", __func__, i); - dev_dbg(dev, + dev_vdbg(dev, "%s: Configure period %d of buf:\n", __func__, i); + dev_vdbg(dev, "\n pset[%d]:\n" " chnum\t%d\n" " slot\t%d\n" @@ -580,14 +706,14 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( " cidx\t%08x\n" " lkrld\t%08x\n", i, echan->ch_num, echan->slot[i], - edesc->pset[i].opt, - edesc->pset[i].src, - edesc->pset[i].dst, - edesc->pset[i].a_b_cnt, - edesc->pset[i].ccnt, - edesc->pset[i].src_dst_bidx, - edesc->pset[i].src_dst_cidx, - edesc->pset[i].link_bcntrld); + edesc->pset[i].param.opt, + edesc->pset[i].param.src, + edesc->pset[i].param.dst, + edesc->pset[i].param.a_b_cnt, + edesc->pset[i].param.ccnt, + edesc->pset[i].param.src_dst_bidx, + edesc->pset[i].param.src_dst_cidx, + edesc->pset[i].param.link_bcntrld); edesc->absync = ret; @@ -595,7 +721,7 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( * Enable interrupts for every period because callback * has to be called for every period. */ - edesc->pset[i].opt |= TCINTEN; + edesc->pset[i].param.opt |= TCINTEN; } return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); @@ -606,7 +732,6 @@ static void edma_callback(unsigned ch_num, u16 ch_status, void *data) struct edma_chan *echan = data; struct device *dev = echan->vchan.chan.device->dev; struct edma_desc *edesc; - unsigned long flags; struct edmacc_param p; edesc = echan->edesc; @@ -617,27 +742,34 @@ static void edma_callback(unsigned ch_num, u16 ch_status, void *data) switch (ch_status) { case EDMA_DMA_COMPLETE: - spin_lock_irqsave(&echan->vchan.lock, flags); + spin_lock(&echan->vchan.lock); if (edesc) { if (edesc->cyclic) { vchan_cyclic_callback(&edesc->vdesc); } else if (edesc->processed == edesc->pset_nr) { dev_dbg(dev, "Transfer complete, stopping channel %d\n", ch_num); + edesc->residue = 0; edma_stop(echan->ch_num); vchan_cookie_complete(&edesc->vdesc); edma_execute(echan); } else { dev_dbg(dev, "Intermediate transfer complete on channel %d\n", ch_num); + + /* Update statistics for tx_status */ + edesc->residue -= edesc->sg_len; + edesc->residue_stat = edesc->residue; + edesc->processed_stat = edesc->processed; + edma_execute(echan); } } - spin_unlock_irqrestore(&echan->vchan.lock, flags); + spin_unlock(&echan->vchan.lock); break; case EDMA_DMA_CC_ERROR: - spin_lock_irqsave(&echan->vchan.lock, flags); + spin_lock(&echan->vchan.lock); edma_read_slot(EDMA_CHAN_SLOT(echan->slot[0]), &p); @@ -668,7 +800,7 @@ static void edma_callback(unsigned ch_num, u16 ch_status, void *data) edma_trigger_channel(echan->ch_num); } - spin_unlock_irqrestore(&echan->vchan.lock, flags); + spin_unlock(&echan->vchan.lock); break; default: @@ -704,7 +836,7 @@ static int edma_alloc_chan_resources(struct dma_chan *chan) echan->alloced = true; echan->slot[0] = echan->ch_num; - dev_dbg(dev, "allocated channel for %u:%u\n", + dev_dbg(dev, "allocated channel %d for %u:%u\n", echan->ch_num, EDMA_CTLR(echan->ch_num), EDMA_CHAN_SLOT(echan->ch_num)); return 0; @@ -756,23 +888,52 @@ static void edma_issue_pending(struct dma_chan *chan) spin_unlock_irqrestore(&echan->vchan.lock, flags); } -static size_t edma_desc_size(struct edma_desc *edesc) +static u32 edma_residue(struct edma_desc *edesc) { + bool dst = edesc->direction == DMA_DEV_TO_MEM; + struct edma_pset *pset = edesc->pset; + dma_addr_t done, pos; int i; - size_t size; - - if (edesc->absync) - for (size = i = 0; i < edesc->pset_nr; i++) - size += (edesc->pset[i].a_b_cnt & 0xffff) * - (edesc->pset[i].a_b_cnt >> 16) * - edesc->pset[i].ccnt; - else - size = (edesc->pset[0].a_b_cnt & 0xffff) * - (edesc->pset[0].a_b_cnt >> 16) + - (edesc->pset[0].a_b_cnt & 0xffff) * - (SZ_64K - 1) * edesc->pset[0].ccnt; - - return size; + + /* + * We always read the dst/src position from the first RamPar + * pset. That's the one which is active now. + */ + pos = edma_get_position(edesc->echan->slot[0], dst); + + /* + * Cyclic is simple. Just subtract pset[0].addr from pos. + * + * We never update edesc->residue in the cyclic case, so we + * can tell the remaining room to the end of the circular + * buffer. + */ + if (edesc->cyclic) { + done = pos - pset->addr; + edesc->residue_stat = edesc->residue - done; + return edesc->residue_stat; + } + + /* + * For SG operation we catch up with the last processed + * status. + */ + pset += edesc->processed_stat; + + for (i = edesc->processed_stat; i < edesc->processed; i++, pset++) { + /* + * If we are inside this pset address range, we know + * this is the active one. Get the current delta and + * stop walking the psets. + */ + if (pos >= pset->addr && pos < pset->addr + pset->len) + return edesc->residue_stat - (pos - pset->addr); + + /* Otherwise mark it done and update residue_stat. */ + edesc->processed_stat++; + edesc->residue_stat -= pset->len; + } + return edesc->residue_stat; } /* Check request completion status */ @@ -790,13 +951,10 @@ static enum dma_status edma_tx_status(struct dma_chan *chan, return ret; spin_lock_irqsave(&echan->vchan.lock, flags); - vdesc = vchan_find_desc(&echan->vchan, cookie); - if (vdesc) { - txstate->residue = edma_desc_size(to_edma_desc(&vdesc->tx)); - } else if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie) { - struct edma_desc *edesc = echan->edesc; - txstate->residue = edma_desc_size(edesc); - } + if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie) + txstate->residue = edma_residue(echan->edesc); + else if ((vdesc = vchan_find_desc(&echan->vchan, cookie))) + txstate->residue = to_edma_desc(&vdesc->tx)->residue; spin_unlock_irqrestore(&echan->vchan.lock, flags); return ret; @@ -822,18 +980,43 @@ static void __init edma_chan_init(struct edma_cc *ecc, } } +#define EDMA_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) + +static int edma_dma_device_slave_caps(struct dma_chan *dchan, + struct dma_slave_caps *caps) +{ + caps->src_addr_widths = EDMA_DMA_BUSWIDTHS; + caps->dstn_addr_widths = EDMA_DMA_BUSWIDTHS; + caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + caps->cmd_pause = true; + caps->cmd_terminate = true; + caps->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; + + return 0; +} + static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma, struct device *dev) { dma->device_prep_slave_sg = edma_prep_slave_sg; dma->device_prep_dma_cyclic = edma_prep_dma_cyclic; + dma->device_prep_dma_memcpy = edma_prep_dma_memcpy; dma->device_alloc_chan_resources = edma_alloc_chan_resources; dma->device_free_chan_resources = edma_free_chan_resources; dma->device_issue_pending = edma_issue_pending; dma->device_tx_status = edma_tx_status; dma->device_control = edma_control; + dma->device_slave_caps = edma_dma_device_slave_caps; dma->dev = dev; + /* + * code using dma memcpy must make sure alignment of + * length is at dma->copy_align boundary. + */ + dma->copy_align = DMA_SLAVE_BUSWIDTH_4_BYTES; + INIT_LIST_HEAD(&dma->channels); } @@ -861,6 +1044,8 @@ static int edma_probe(struct platform_device *pdev) dma_cap_zero(ecc->dma_slave.cap_mask); dma_cap_set(DMA_SLAVE, ecc->dma_slave.cap_mask); + dma_cap_set(DMA_CYCLIC, ecc->dma_slave.cap_mask); + dma_cap_set(DMA_MEMCPY, ecc->dma_slave.cap_mask); edma_dma_init(ecc, &ecc->dma_slave, &pdev->dev); |
