diff options
Diffstat (limited to 'drivers/dma/dw/dw.c')
| -rw-r--r-- | drivers/dma/dw/dw.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/dma/dw/dw.c b/drivers/dma/dw/dw.c index 156088f768f2..7a085b3c1854 100644 --- a/drivers/dma/dw/dw.c +++ b/drivers/dma/dw/dw.c @@ -4,6 +4,7 @@ // Copyright (C) 2013,2018 Intel Corporation #include <linux/bitops.h> +#include <linux/dmaengine.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/types.h> @@ -63,6 +64,22 @@ static size_t dw_dma_block2bytes(struct dw_dma_chan *dwc, u32 block, u32 width) return DWC_CTLH_BLOCK_TS(block) << width; } +static u32 dw_dma_prepare_ctllo(struct dw_dma_chan *dwc) +{ + struct dma_slave_config *sconfig = &dwc->dma_sconfig; + bool is_slave = is_slave_direction(dwc->direction); + u8 smsize = is_slave ? sconfig->src_maxburst : DW_DMA_MSIZE_16; + u8 dmsize = is_slave ? sconfig->dst_maxburst : DW_DMA_MSIZE_16; + u8 p_master = dwc->dws.p_master; + u8 m_master = dwc->dws.m_master; + u8 dms = (dwc->direction == DMA_MEM_TO_DEV) ? p_master : m_master; + u8 sms = (dwc->direction == DMA_DEV_TO_MEM) ? p_master : m_master; + + return DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN | + DWC_CTLL_DST_MSIZE(dmsize) | DWC_CTLL_SRC_MSIZE(smsize) | + DWC_CTLL_DMS(dms) | DWC_CTLL_SMS(sms); +} + static void dw_dma_encode_maxburst(struct dw_dma_chan *dwc, u32 *maxburst) { /* @@ -99,6 +116,7 @@ int dw_dma_probe(struct dw_dma_chip *chip) dw->initialize_chan = dw_dma_initialize_chan; dw->suspend_chan = dw_dma_suspend_chan; dw->resume_chan = dw_dma_resume_chan; + dw->prepare_ctllo = dw_dma_prepare_ctllo; dw->encode_maxburst = dw_dma_encode_maxburst; dw->bytes2block = dw_dma_bytes2block; dw->block2bytes = dw_dma_block2bytes; |