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-rw-r--r--drivers/dma/edma.c335
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);
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