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authorChristoph Hellwig <hch@lst.de>2019-04-28 14:00:52 -0500
committerChristoph Hellwig <hch@lst.de>2019-06-25 14:28:06 +0200
commitb1acd4b8a8942f614053e516c56c88e1716562d6 (patch)
treeb8951a3c62f573aa7445bf695a19f66a282fd578 /arch/nios2
parent6309513c1be47cd3805a6ceae60ab70285df36ae (diff)
downloadlinux-b1acd4b8a8942f614053e516c56c88e1716562d6.tar.bz2
nios2: use the generic uncached segment support in dma-direct
Stop providing our own arch alloc/free hooks and just expose the segment offset and use the generic dma-direct allocator. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Ley Foon Tan <ley.foon.tan@intel.com>
Diffstat (limited to 'arch/nios2')
-rw-r--r--arch/nios2/Kconfig1
-rw-r--r--arch/nios2/include/asm/page.h6
-rw-r--r--arch/nios2/mm/dma-mapping.c34
3 files changed, 16 insertions, 25 deletions
diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 26a9c760a98b..44b5da37e8bd 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -4,6 +4,7 @@ config NIOS2
select ARCH_32BIT_OFF_T
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+ select ARCH_HAS_UNCACHED_SEGMENT
select ARCH_NO_SWAP
select TIMER_OF
select GENERIC_ATOMIC64
diff --git a/arch/nios2/include/asm/page.h b/arch/nios2/include/asm/page.h
index f1fbdc47bdaf..79fcac61f6ef 100644
--- a/arch/nios2/include/asm/page.h
+++ b/arch/nios2/include/asm/page.h
@@ -101,12 +101,6 @@ static inline bool pfn_valid(unsigned long pfn)
# define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
-# define UNCAC_ADDR(addr) \
- ((void *)((unsigned)(addr) | CONFIG_NIOS2_IO_REGION_BASE))
-# define CAC_ADDR(addr) \
- ((void *)(((unsigned)(addr) & ~CONFIG_NIOS2_IO_REGION_BASE) | \
- CONFIG_NIOS2_KERNEL_REGION_BASE))
-
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c
index 4af9e5b5ba1c..9cb238664584 100644
--- a/arch/nios2/mm/dma-mapping.c
+++ b/arch/nios2/mm/dma-mapping.c
@@ -60,32 +60,28 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
}
}
-void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
- gfp_t gfp, unsigned long attrs)
+void arch_dma_prep_coherent(struct page *page, size_t size)
{
- void *ret;
+ unsigned long start = (unsigned long)page_address(page);
- /* optimized page clearing */
- gfp |= __GFP_ZERO;
+ flush_dcache_range(start, start + size);
+}
- if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
- gfp |= GFP_DMA;
+void *uncached_kernel_address(void *ptr)
+{
+ unsigned long addr = (unsigned long)ptr;
- ret = (void *) __get_free_pages(gfp, get_order(size));
- if (ret != NULL) {
- *dma_handle = virt_to_phys(ret);
- flush_dcache_range((unsigned long) ret,
- (unsigned long) ret + size);
- ret = UNCAC_ADDR(ret);
- }
+ addr |= CONFIG_NIOS2_IO_REGION_BASE;
- return ret;
+ return (void *)ptr;
}
-void arch_dma_free(struct device *dev, size_t size, void *vaddr,
- dma_addr_t dma_handle, unsigned long attrs)
+void *cached_kernel_address(void *ptr)
{
- unsigned long addr = (unsigned long) CAC_ADDR((unsigned long) vaddr);
+ unsigned long addr = (unsigned long)ptr;
+
+ addr &= ~CONFIG_NIOS2_IO_REGION_BASE;
+ addr |= CONFIG_NIOS2_KERNEL_REGION_BASE;
- free_pages(addr, get_order(size));
+ return (void *)ptr;
}