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i.MX28: Add cache support into the APBH DMA driver

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The desc_append() now flushes descriptors into RAM.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Marek Vasut 2012-03-15 18:33:18 +00:00 committed by Albert ARIBAUD
parent a4aaad7048
commit c3dfe70776
1 changed files with 22 additions and 1 deletions
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23
drivers/dma/apbh_dma.c
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@ -93,6 +93,21 @@ static int mxs_dma_read_semaphore(int channel)
return tmp;
}
#ifndef CONFIG_SYS_DCACHE_OFF
void mxs_dma_flush_desc(struct mxs_dma_desc *desc)
{
uint32_t addr;
uint32_t size;
addr = (uint32_t)desc;
size = roundup(sizeof(struct mxs_dma_desc), MXS_DMA_ALIGNMENT);
flush_dcache_range(addr, addr + size);
}
#else
inline void mxs_dma_flush_desc(struct mxs_dma_desc *desc) {}
#endif
/*
* Enable a DMA channel.
*
@ -329,8 +344,10 @@ static int mxs_dma_release(int channel)
struct mxs_dma_desc *mxs_dma_desc_alloc(void)
{
struct mxs_dma_desc *pdesc;
uint32_t size;
pdesc = memalign(MXS_DMA_ALIGNMENT, sizeof(struct mxs_dma_desc));
size = roundup(sizeof(struct mxs_dma_desc), MXS_DMA_ALIGNMENT);
pdesc = memalign(MXS_DMA_ALIGNMENT, size);
if (pdesc == NULL)
return NULL;
@ -415,12 +432,16 @@ int mxs_dma_desc_append(int channel, struct mxs_dma_desc *pdesc)
last->cmd.next = mxs_dma_cmd_address(pdesc);
last->cmd.data |= MXS_DMA_DESC_CHAIN;
mxs_dma_flush_desc(last);
}
pdesc->flags |= MXS_DMA_DESC_READY;
if (pdesc->flags & MXS_DMA_DESC_FIRST)
pchan->pending_num++;
list_add_tail(&pdesc->node, &pchan->active);
mxs_dma_flush_desc(pdesc);
return ret;
}