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Make bcm2835 DMA address handling less egregious #6658

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merged 2 commits into from
Feb 7, 2025
Merged

Make bcm2835 DMA address handling less egregious #6658

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480c9f0
dma-direct: take dma-ranges/offsets into account in resource mapping
fancer Jun 10, 2022
d26d1a0
dmaengine: bcm2835: Use dma_map_resource
pelwell May 11, 2023
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13 changes: 8 additions & 5 deletions drivers/dma/bcm2835-dma.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,6 @@
* Copyright 2012 Marvell International Ltd.
*/
#include <linux/dmaengine.h>
#include <linux/dma-direct.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/err.h>
Expand Down Expand Up @@ -1024,12 +1023,14 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_slave_sg(
if (direction == DMA_DEV_TO_MEM) {
if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
src = phys_to_dma(chan->device->dev, c->cfg.src_addr);
src = dma_map_resource(chan->device->dev, DMA_SLAVE_BUSWIDTH_4_BYTES,
c->cfg.src_addr, DMA_FROM_DEVICE, 0);
info |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC;
} else {
if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
dst = phys_to_dma(chan->device->dev, c->cfg.dst_addr);
dst = dma_map_resource(chan->device->dev, DMA_SLAVE_BUSWIDTH_4_BYTES,
c->cfg.dst_addr, DMA_TO_DEVICE, 0);
info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC;
}

Expand Down Expand Up @@ -1099,13 +1100,15 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic(
if (direction == DMA_DEV_TO_MEM) {
if (c->cfg.src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
src = phys_to_dma(chan->device->dev, c->cfg.src_addr);
src = dma_map_resource(chan->device->dev, DMA_SLAVE_BUSWIDTH_4_BYTES,
c->cfg.src_addr, DMA_FROM_DEVICE, 0);
dst = buf_addr;
info |= BCM2835_DMA_S_DREQ | BCM2835_DMA_D_INC;
} else {
if (c->cfg.dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)
return NULL;
dst = phys_to_dma(chan->device->dev, c->cfg.dst_addr);
dst = dma_map_resource(chan->device->dev, DMA_SLAVE_BUSWIDTH_4_BYTES,
c->cfg.dst_addr, DMA_TO_DEVICE, 0);
src = buf_addr;
info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC;

Expand Down
2 changes: 1 addition & 1 deletion kernel/dma/direct.c
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Original file line number Diff line number Diff line change
Expand Up @@ -505,7 +505,7 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
size_t size, enum dma_data_direction dir, unsigned long attrs)
{
dma_addr_t dma_addr = paddr;
dma_addr_t dma_addr = phys_to_dma_direct(dev, paddr);

if (unlikely(!dma_capable(dev, dma_addr, size, false))) {
dev_err_once(dev,
Expand Down
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