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| author |   Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2015-09-14 11:55:41 +0300 |
|---|---|---|
| committer |   Vinod Koul <vinod.koul@intel.com> | 2015-09-25 07:54:05 +0530 |
| commit | 97c37accd38f6136fa0abbdef01b5f864e91e6c7 (patch) | |
| tree | bff92ff0e32a0afbeeabdd01633b40c81982c66c /drivers/dma/idma64.h | |
| parent | dmaengine: idma64: make better performance on pause / resume (diff) | |
| download | linux-dev-97c37accd38f6136fa0abbdef01b5f864e91e6c7.tar.xz linux-dev-97c37accd38f6136fa0abbdef01b5f864e91e6c7.zip | |
dmaengine: idma64: use lo_hi_readq() / lo_hi_writeq()
There are already helper functions to do 64-bit I/O on 32-bit machines, thus we
don't need to reinvent the wheel. In our case we can't use readq() / writeq()
even on 64-bit kernel since there is a hardware limitation (OCP bus is a 32-bit
bus).
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/idma64.h')
| -rw-r--r-- | drivers/dma/idma64.h | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/dma/idma64.h b/drivers/dma/idma64.h index 323c3f13ba2f..f6aeff0af8a5 100644 --- a/drivers/dma/idma64.h +++ b/drivers/dma/idma64.h @@ -16,6 +16,8 @@ #include <linux/spinlock.h> #include <linux/types.h> +#include <asm-generic/io-64-nonatomic-lo-hi.h> + #include "virt-dma.h" /* Channel registers */ @@ -166,19 +168,13 @@ static inline void idma64c_writel(struct idma64_chan *idma64c, int offset, static inline u64 idma64c_readq(struct idma64_chan *idma64c, int offset) { - u64 l, h; - - l = idma64c_readl(idma64c, offset); - h = idma64c_readl(idma64c, offset + 4); - - return l | (h << 32); + return lo_hi_readq(idma64c->regs + offset); } static inline void idma64c_writeq(struct idma64_chan *idma64c, int offset, u64 value) { - idma64c_writel(idma64c, offset, value); - idma64c_writel(idma64c, offset + 4, value >> 32); + lo_hi_writeq(value, idma64c->regs + offset); } #define channel_readq(idma64c, reg) \ |