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dmaengine/dw_dmac fix: use readl & writel instead of __raw_readl & __raw_writel 

On ARMv7 cores, device memory mapped as Normal Non-cacheable, may not guarantee
ordered access causing failures in device drivers that do not use the mandatory
memory barriers. readl & writel versions contain necessary memory barriers for
this.

commit 79f64dbf68c8a9779a7e9a25e0a9f0217a25b57a: "ARM: 6273/1: Add barriers to
the I/O accessors if ARM_DMA_MEM_BUFFERABLE" can be referred for more
information on this.

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 2011-03-04 14:58:32 +05:30 committed by Vinod Koul
parent 1c5b0538c7
commit 29782da5f0
1 changed files with 4 additions and 4 deletions
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8
drivers/dma/dw_dmac_regs.h
View File

@ -159,9 +159,9 @@ __dwc_regs(struct dw_dma_chan *dwc)
}
#define channel_readl(dwc, name) \
__raw_readl(&(__dwc_regs(dwc)->name))
readl(&(__dwc_regs(dwc)->name))
#define channel_writel(dwc, name, val) \
__raw_writel((val), &(__dwc_regs(dwc)->name))
writel((val), &(__dwc_regs(dwc)->name))
static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan)
{
@ -185,9 +185,9 @@ static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw)
}
#define dma_readl(dw, name) \
__raw_readl(&(__dw_regs(dw)->name))
readl(&(__dw_regs(dw)->name))
#define dma_writel(dw, name, val) \
__raw_writel((val), &(__dw_regs(dw)->name))
writel((val), &(__dw_regs(dw)->name))
#define channel_set_bit(dw, reg, mask) \
dma_writel(dw, reg, ((mask) << 8) | (mask))