On Tue, 2014-07-15 at 11:38 +0200, Arnd Bergmann wrote:
> More importantly: you do the same operation for both _for_cpu and _for_device.
> I assume your CPU can never do speculative cache prefetches, so it's not
> incorrect, but you do twice the number of invalidations and flushes that
> you need.
On Thu, Jul 24, 2014 at 8:05 PM, Arnd Bergmann wrote:
>> I have spent some times look at other architectures and below is what
>> I found. Please correct me if I am wrong, especially
>> for_device():DMA_FROM_DEVICE.
>>
>> _for_cpu():
>> case DMA_BIDIRECTIONAL:
>> case DMA_FROM_DEVICE:
>> /* i
On Thu, Jul 24, 2014 at 02:05:16PM +0200, Arnd Bergmann wrote:
> > >> +void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
> > >> + size_t size, enum dma_data_direction
> > >> direction)
> > >> +{
> > >> + BUG_ON(!valid_dma_direction(direction));
>
On Thursday 24 July 2014 19:37:11 Ley Foon Tan wrote:
> On Tue, Jul 15, 2014 at 5:38 PM, Arnd Bergmann wrote:
> > On Tuesday 15 July 2014 16:45:40 Ley Foon Tan wrote:
> >> +#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
> >> +#define dma_free_noncoherent(d, s, v, h) dma_f
On Tue, Jul 15, 2014 at 5:38 PM, Arnd Bergmann wrote:
> On Tuesday 15 July 2014 16:45:40 Ley Foon Tan wrote:
>
>> +static inline void __dma_sync(void *vaddr, size_t size,
>> + enum dma_data_direction direction)
>> +{
>> + switch (direction) {
>> + case DMA_FROM_DE
On Tuesday 15 July 2014 16:45:40 Ley Foon Tan wrote:
> +static inline void __dma_sync(void *vaddr, size_t size,
> + enum dma_data_direction direction)
> +{
> + switch (direction) {
> + case DMA_FROM_DEVICE: /* invalidate cache */
> + invalidate_dcach
This patch adds support for the DMA mapping API.
Signed-off-by: Ley Foon Tan
---
arch/nios2/include/asm/dma-mapping.h | 106
arch/nios2/mm/dma-mapping.c | 186 +++
2 files changed, 292 insertions(+)
create mode 100644 arch/nios2/incl
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