xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dw_dmac: Pass Channel Priority from platform_data

Browse Source 
In Synopsys designware, channel priority is programmable. This patch adds
support for passing channel priority through platform data. By default Ascending
channel priority will be followed, i.e. channel 0 will get highest priority and
channel 7 will get lowest.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Viresh Kumar
2011-03-03 15:47:22 +05:30
committed by Vinod Koul
parent b0c3130d69
commit 93317e8e35
3 changed files with 16 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/dw_dmac.h
View File

@@ -25,6 +25,9 @@ struct dw_dma_platform_data {
#define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */
#define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */
unsigned char chan_allocation_order;
#define CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */
#define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */
unsigned char chan_priority;
};
/**
@@ -70,7 +73,6 @@ struct dw_dma_slave {
#define DWC_CFGH_DST_PER(x) ((x) << 11)
/* Platform-configurable bits in CFG_LO */
#define DWC_CFGL_PRIO(x) ((x) << 5) /* priority */
#define DWC_CFGL_LOCK_CH_XFER (0 << 12) /* scope of LOCK_CH */
#define DWC_CFGL_LOCK_CH_BLOCK (1 << 12)
#define DWC_CFGL_LOCK_CH_XACT (2 << 12)