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Subject[PATCH v3 2/3] dmaengine: imx-sdma: add memcpy interface
Date
Add MEMCPY capability for imx-sdma driver.

Signed-off-by: Robin Gong <yibin.gong@nxp.com>
---
drivers/dma/imx-sdma.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 90 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index e3d5e73..b4ec2d2 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -342,6 +342,7 @@ struct sdma_desc {
* @pc_from_device: script address for those device_2_memory
* @pc_to_device: script address for those memory_2_device
* @device_to_device: script address for those device_2_device
+ * @pc_to_pc: script address for those memory_2_memory
* @flags: loop mode or not
* @per_address: peripheral source or destination address in common case
* destination address in p_2_p case
@@ -367,6 +368,7 @@ struct sdma_channel {
enum dma_slave_buswidth word_size;
unsigned int pc_from_device, pc_to_device;
unsigned int device_to_device;
+ unsigned int pc_to_pc;
unsigned long flags;
dma_addr_t per_address, per_address2;
unsigned long event_mask[2];
@@ -869,14 +871,16 @@ static void sdma_get_pc(struct sdma_channel *sdmac,
* These are needed once we start to support transfers between
* two peripherals or memory-to-memory transfers
*/
- int per_2_per = 0;
+ int per_2_per = 0, emi_2_emi = 0;

sdmac->pc_from_device = 0;
sdmac->pc_to_device = 0;
sdmac->device_to_device = 0;
+ sdmac->pc_to_pc = 0;

switch (peripheral_type) {
case IMX_DMATYPE_MEMORY:
+ emi_2_emi = sdma->script_addrs->ap_2_ap_addr;
break;
case IMX_DMATYPE_DSP:
emi_2_per = sdma->script_addrs->bp_2_ap_addr;
@@ -949,6 +953,7 @@ static void sdma_get_pc(struct sdma_channel *sdmac,
sdmac->pc_from_device = per_2_emi;
sdmac->pc_to_device = emi_2_per;
sdmac->device_to_device = per_2_per;
+ sdmac->pc_to_pc = emi_2_emi;
}

static int sdma_load_context(struct sdma_channel *sdmac)
@@ -965,6 +970,8 @@ static int sdma_load_context(struct sdma_channel *sdmac)
load_address = sdmac->pc_from_device;
else if (sdmac->direction == DMA_DEV_TO_DEV)
load_address = sdmac->device_to_device;
+ else if (sdmac->direction == DMA_MEM_TO_MEM)
+ load_address = sdmac->pc_to_pc;
else
load_address = sdmac->pc_to_device;

@@ -1214,10 +1221,28 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan)
{
struct sdma_channel *sdmac = to_sdma_chan(chan);
struct imx_dma_data *data = chan->private;
+ struct imx_dma_data mem_data;
int prio, ret;

- if (!data)
- return -EINVAL;
+ /*
+ * MEMCPY may never setup chan->private by filter function such as
+ * dmatest, thus create 'struct imx_dma_data mem_data' for this case.
+ * Please note in any other slave case, you have to setup chan->private
+ * with 'struct imx_dma_data' in your own filter function if you want to
+ * request dma channel by dma_request_channel() rather than
+ * dma_request_slave_channel(). Othwise, 'MEMCPY in case?' will appear
+ * to warn you to correct your filter function.
+ */
+ if (!data) {
+ dev_dbg(sdmac->sdma->dev, "MEMCPY in case?\n");
+ mem_data.priority = 2;
+ mem_data.peripheral_type = IMX_DMATYPE_MEMORY;
+ mem_data.dma_request = 0;
+ mem_data.dma_request2 = 0;
+ data = &mem_data;
+
+ sdma_get_pc(sdmac, IMX_DMATYPE_MEMORY);
+ }

switch (data->priority) {
case DMA_PRIO_HIGH:
@@ -1307,6 +1332,10 @@ static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,
if (sdma_alloc_bd(desc))
goto err_desc_out;

+ /* No slave_config called in MEMCPY case, so do here */
+ if (direction == DMA_MEM_TO_MEM)
+ sdma_config_ownership(sdmac, false, true, false);
+
if (sdma_load_context(sdmac))
goto err_desc_out;

@@ -1318,6 +1347,62 @@ static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,
return NULL;
}

+static struct dma_async_tx_descriptor *sdma_prep_memcpy(
+ struct dma_chan *chan, dma_addr_t dma_dst,
+ dma_addr_t dma_src, size_t len, unsigned long flags)
+{
+ struct sdma_channel *sdmac = to_sdma_chan(chan);
+ struct sdma_engine *sdma = sdmac->sdma;
+ int channel = sdmac->channel;
+ size_t count;
+ int i = 0, param;
+ struct sdma_buffer_descriptor *bd;
+ struct sdma_desc *desc;
+
+ if (!chan || !len)
+ return NULL;
+
+ dev_dbg(sdma->dev, "memcpy: %pad->%pad, len=%zu, channel=%d.\n",
+ &dma_src, &dma_dst, len, channel);
+
+ desc = sdma_transfer_init(sdmac, DMA_MEM_TO_MEM,
+ len / SDMA_BD_MAX_CNT + 1);
+ if (!desc)
+ return NULL;
+
+ do {
+ count = min_t(size_t, len, SDMA_BD_MAX_CNT);
+ bd = &desc->bd[i];
+ bd->buffer_addr = dma_src;
+ bd->ext_buffer_addr = dma_dst;
+ bd->mode.count = count;
+ desc->chn_count += count;
+ bd->mode.command = 0;
+
+ dma_src += count;
+ dma_dst += count;
+ len -= count;
+ i++;
+
+ param = BD_DONE | BD_EXTD | BD_CONT;
+ /* last bd */
+ if (!len) {
+ param |= BD_INTR;
+ param |= BD_LAST;
+ param &= ~BD_CONT;
+ }
+
+ dev_dbg(sdma->dev, "entry %d: count: %zd dma: 0x%x %s%s\n",
+ i, count, bd->buffer_addr,
+ param & BD_WRAP ? "wrap" : "",
+ param & BD_INTR ? " intr" : "");
+
+ bd->mode.status = param;
+ } while (len);
+
+ return vchan_tx_prep(&sdmac->vc, &desc->vd, flags);
+}
+
static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
struct dma_chan *chan, struct scatterlist *sgl,
unsigned int sg_len, enum dma_transfer_direction direction,
@@ -1903,6 +1988,7 @@ static int sdma_probe(struct platform_device *pdev)

dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);
+ dma_cap_set(DMA_MEMCPY, sdma->dma_device.cap_mask);

INIT_LIST_HEAD(&sdma->dma_device.channels);
/* Initialize channel parameters */
@@ -1969,6 +2055,7 @@ static int sdma_probe(struct platform_device *pdev)
sdma->dma_device.dst_addr_widths = SDMA_DMA_BUSWIDTHS;
sdma->dma_device.directions = SDMA_DMA_DIRECTIONS;
sdma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
+ sdma->dma_device.device_prep_dma_memcpy = sdma_prep_memcpy;
sdma->dma_device.device_issue_pending = sdma_issue_pending;
sdma->dma_device.dev->dma_parms = &sdma->dma_parms;
dma_set_max_seg_size(sdma->dma_device.dev, SDMA_BD_MAX_CNT);
--
2.7.4
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