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[v2,21/26] dmaengine: dw-edma: Drop DT-region allocation

Message ID 20220503225104.12108-22-Sergey.Semin@baikalelectronics.ru (mailing list archive)
State Superseded
Delegated to: Lorenzo Pieralisi
Headers show
Series dmaengine: dw-edma: Add RP/EP local DMA controllers support | expand

Commit Message

Serge Semin May 3, 2022, 10:50 p.m. UTC 
There is no point in allocating an additional memory for the data target
regions passed then to the client drivers. Just use the already available
structures defined in the dw_edma_chip instance.

Note these regions are unused in normal circumstances since they are
specific to the case of eDMA being embedded into the DW PCIe End-point and
having it's CSRs accessible over a End-point' BAR. This case is only known
to be implemented as a part of the Synopsys PCIe EndPoint IP prototype
kit.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
 drivers/dma/dw-edma/dw-edma-core.c | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)
diff mbox series

Patch

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index 7ba3b60c960c..98a94a66fb82 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -744,7 +744,6 @@  static void dw_edma_free_chan_resources(struct dma_chan *dchan)
 static int dw_edma_channel_setup(struct dw_edma *dw, u32 wr_alloc, u32 rd_alloc)
 {
 	struct dw_edma_chip *chip = dw->chip;
-	struct dw_edma_region *dt_region;
 	struct device *dev = chip->dev;
 	struct dw_edma_chan *chan;
 	struct dw_edma_irq *irq;
@@ -760,12 +759,6 @@  static int dw_edma_channel_setup(struct dw_edma *dw, u32 wr_alloc, u32 rd_alloc)
 	for (i = 0; i < ch_cnt; i++) {
 		chan = &dw->chan[i];
 
-		dt_region = devm_kzalloc(dev, sizeof(*dt_region), GFP_KERNEL);
-		if (!dt_region)
-			return -ENOMEM;
-
-		chan->vc.chan.private = dt_region;
-
 		chan->dw = dw;
 
 		if (i < dw->wr_ch_cnt) {
@@ -813,17 +806,11 @@  static int dw_edma_channel_setup(struct dw_edma *dw, u32 wr_alloc, u32 rd_alloc)
 			 chan->msi.data);
 
 		chan->vc.desc_free = vchan_free_desc;
-		vchan_init(&chan->vc, dma);
+		chan->vc.chan.private = chan->dir == EDMA_DIR_WRITE ?
+					&dw->chip->dt_region_wr[chan->id] :
+					&dw->chip->dt_region_rd[chan->id];
 
-		if (chan->dir == EDMA_DIR_WRITE) {
-			dt_region->paddr = chip->dt_region_wr[chan->id].paddr;
-			dt_region->vaddr = chip->dt_region_wr[chan->id].vaddr;
-			dt_region->sz = chip->dt_region_wr[chan->id].sz;
-		} else {
-			dt_region->paddr = chip->dt_region_rd[chan->id].paddr;
-			dt_region->vaddr = chip->dt_region_rd[chan->id].vaddr;
-			dt_region->sz = chip->dt_region_rd[chan->id].sz;
-		}
+		vchan_init(&chan->vc, dma);
 
 		dw_edma_v0_core_device_config(chan);
 	}