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dw-dma: add method to retrieve lli from memory 

Implements new platform specific method, which allows for
retrieving linked list item from memory. The best example
are cAVS platforms, which need read it through uncached
memory region. Rest of the platforms currently don't need
the implementation, since they don't support hardware linked list.

Signed-off-by: Tomasz Lauda <tomasz.lauda@linux.intel.com>
This commit is contained in:
Tomasz Lauda 2020-01-27 11:19:58 +01:00 committed by Janusz Jankowski
parent e74ed8dc56
commit 9e4d1aae90
2 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/drivers/dw/dma.c
View File

@ -816,7 +816,7 @@ static void dw_dma_verify_transfer(struct dma_chan_data *channel,
{
struct dw_dma_chan_data *dw_chan = dma_chan_get_data(channel);
#if CONFIG_HW_LLI
struct dw_lli *ll_uncached = cache_to_uncache(dw_chan->lli_current);
struct dw_lli *lli = platform_dw_dma_lli_get(dw_chan->lli_current);
switch (next->status) {
case DMA_CB_STATUS_END:
@ -825,11 +825,11 @@ static void dw_dma_verify_transfer(struct dma_chan_data *channel,
DW_CHAN_MASK(channel->index));
/* fallthrough */
default:
while (ll_uncached->ctrl_hi & DW_CTLH_DONE(1)) {
ll_uncached->ctrl_hi &= ~DW_CTLH_DONE(1);
while (lli->ctrl_hi & DW_CTLH_DONE(1)) {
lli->ctrl_hi &= ~DW_CTLH_DONE(1);
dw_chan->lli_current =
(struct dw_lli *)dw_chan->lli_current->llp;
ll_uncached = cache_to_uncache(dw_chan->lli_current);
lli = platform_dw_dma_lli_get(dw_chan->lli_current);
}
break;
}

5
src/platform/intel/cavs/include/cavs/drivers/dw-dma.h
View File

@ -85,6 +85,11 @@ static inline void platform_dw_dma_llp_disable(struct dma *dma,
shim_read(DW_CHLLPC(dma, chan)) & ~SHIM_GPDMA_CHLLPC_EN);
}
static inline struct dw_lli *platform_dw_dma_lli_get(struct dw_lli *lli)
{
return cache_to_uncache(lli);
}
#endif /* __CAVS_LIB_DW_DMA_H__ */
#else