[PATCH v7 01/11] dmaengine: dw: keep copy of custom slave config in dwc

Andy Shevchenko
2016-06-17T12:43:00Z

It seems we need to extend custom slave configuration by one more member to
support Intel Quart UART. It becomes a burden to manage all members of struct
dw_dma_slave one-by-one.

Replace set of fields by embedding struct dw_dma_slave into struct dw_dma_chan.

Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/dma/dw/core.c | 29 ++++++++++-------------------
drivers/dma/dw/regs.h | 5 +----
2 files changed, 11 insertions(+), 23 deletions(-)

diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index edf053f..81b06df 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -46,9 +46,9 @@
u8 _dmsize = _is_slave ? _sconfig->dst_maxburst : \
DW_DMA_MSIZE_16; \
u8 _dms = (_dwc->direction == DMA_MEM_TO_DEV) ? \
- _dwc->p_master : _dwc->m_master; \
+ _dwc->dws.p_master : _dwc->dws.m_master; \
u8 _sms = (_dwc->direction == DMA_DEV_TO_MEM) ? \
- _dwc->p_master : _dwc->m_master; \
+ _dwc->dws.p_master : _dwc->dws.m_master; \
\
(DWC_CTLL_DST_MSIZE(_dmsize) \
| DWC_CTLL_SRC_MSIZE(_smsize) \
@@ -147,8 +147,8 @@ static void dwc_initialize(struct dw_dma_chan *dwc)
if (test_bit(DW_DMA_IS_INITIALIZED, &dwc->flags))
return;

- cfghi |= DWC_CFGH_DST_PER(dwc->dst_id);
- cfghi |= DWC_CFGH_SRC_PER(dwc->src_id);
+ cfghi |= DWC_CFGH_DST_PER(dwc->dws.dst_id);
+ cfghi |= DWC_CFGH_SRC_PER(dwc->dws.src_id);

channel_writel(dwc, CFG_LO, cfglo);
channel_writel(dwc, CFG_HI, cfghi);
@@ -209,7 +209,7 @@ static inline void dwc_do_single_block(struct dw_dma_chan *dwc,
static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
- u8 lms = DWC_LLP_LMS(dwc->m_master);
+ u8 lms = DWC_LLP_LMS(dwc->dws.m_master);
unsigned long was_soft_llp;

/* ASSERT: channel is idle */
@@ -662,7 +662,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
struct dw_desc *prev;
size_t xfer_count;
size_t offset;
- u8 m_master = dwc->m_master;
+ u8 m_master = dwc->dws.m_master;
unsigned int src_width;
unsigned int dst_width;
unsigned int data_width = dw->pdata->data_width[m_master];
@@ -740,7 +740,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
struct dw_desc *prev;
struct dw_desc *first;
u32 ctllo;
- u8 m_master = dwc->m_master;
+ u8 m_master = dwc->dws.m_master;
u8 lms = DWC_LLP_LMS(m_master);
dma_addr_t reg;
unsigned int reg_width;
@@ -895,12 +895,7 @@ bool dw_dma_filter(struct dma_chan *chan, void *param)
return false;

/* We have to copy data since dws can be temporary storage */
-
- dwc->src_id = dws->src_id;
- dwc->dst_id = dws->dst_id;
-
- dwc->m_master = dws->m_master;
- dwc->p_master = dws->p_master;
+ memcpy(&dwc->dws, dws, sizeof(struct dw_dma_slave));

return true;
}
@@ -1167,11 +1162,7 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
spin_lock_irqsave(&dwc->lock, flags);

/* Clear custom channel configuration */
- dwc->src_id = 0;
- dwc->dst_id = 0;
-
- dwc->m_master = 0;
- dwc->p_master = 0;
+ memset(&dwc->dws, 0, sizeof(struct dw_dma_slave));

clear_bit(DW_DMA_IS_INITIALIZED, &dwc->flags);

@@ -1264,7 +1255,7 @@ struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan,
struct dw_cyclic_desc *retval = NULL;
struct dw_desc *desc;
struct dw_desc *last = NULL;
- u8 lms = DWC_LLP_LMS(dwc->m_master);
+ u8 lms = DWC_LLP_LMS(dwc->dws.m_master);
unsigned long was_cyclic;
unsigned int reg_width;
unsigned int periods;
diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h
index 4b7bd78..f65dd10 100644
--- a/drivers/dma/dw/regs.h
+++ b/drivers/dma/dw/regs.h
@@ -245,10 +245,7 @@ struct dw_dma_chan {
bool nollp;

/* custom slave configuration */
- u8 src_id;
- u8 dst_id;
- u8 m_master;
- u8 p_master;
+ struct dw_dma_slave dws;

/* configuration passed via .device_config */
struct dma_slave_config dma_sconfig;
--
2.8.1