MIPS: Loongson: Add swiotlb to support All-Memory DMA

Loongson doesn't support DMA address above 4GB traditionally. If memory
is more than 4GB, CONFIG_SWIOTLB and ZONE_DMA32 should be selected. In
this way, DMA pages are allocated below 4GB preferably. However, if low
memory is not enough, high pages are allocated and swiotlb is used for
bouncing.

Moreover, we provide a platform-specific dma_map_ops::set_dma_mask() to
set a device's dma_mask and coherent_dma_mask. We use these masks to
distinguishes an allocated page can be used for DMA directly, or need
swiotlb to bounce.

Recently, we found that 32-bit DMA isn't a hardware bug, but a hardware
configuration issue. So, latest firmware has enable the DMA support as
high as 40-bit. To support all-memory DMA for all devices (besides the
Loongson platform limit, there are still some devices have their own
DMA32 limit), and also to be compatible with old firmware, we keep use
swiotlb.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Hongliang Tao <taohl@lemote.com>
Signed-off-by: Hua Yan <yanh@lemote.com>
Tested-by: Alex Smith <alex.smith@imgtec.com>
Reviewed-by: Alex Smith <alex.smith@imgtec.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/6636
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 26 insertions, 1 deletions

diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index 84238c574d5e..06412aa9e3fb 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -49,9 +49,14 @@ static inline int dma_mapping_error(struct device *dev, u64 mask)
 static inline int
 dma_set_mask(struct device *dev, u64 mask)
 {
+	struct dma_map_ops *ops = get_dma_ops(dev);
+
 	if(!dev->dma_mask || !dma_supported(dev, mask))
 		return -EIO;
 
+	if (ops->set_dma_mask)
+		return ops->set_dma_mask(dev, mask);
+
 	*dev->dma_mask = mask;
 
 	return 0;
diff --git a/arch/mips/include/asm/mach-loongson/dma-coherence.h b/arch/mips/include/asm/mach-loongson/dma-coherence.h
index aeb2c05d6145..6a902751cc7f 100644
--- a/arch/mips/include/asm/mach-loongson/dma-coherence.h
+++ b/arch/mips/include/asm/mach-loongson/dma-coherence.h
@@ -11,24 +11,40 @@
 #ifndef __ASM_MACH_LOONGSON_DMA_COHERENCE_H
 #define __ASM_MACH_LOONGSON_DMA_COHERENCE_H
 
+#ifdef CONFIG_SWIOTLB
+#include <linux/swiotlb.h>
+#endif
+
 struct device;
 
+extern dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
+extern phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr);
 static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr,
 					  size_t size)
 {
+#ifdef CONFIG_CPU_LOONGSON3
+	return virt_to_phys(addr);
+#else
 	return virt_to_phys(addr) | 0x80000000;
+#endif
 }
 
 static inline dma_addr_t plat_map_dma_mem_page(struct device *dev,
 					       struct page *page)
 {
+#ifdef CONFIG_CPU_LOONGSON3
+	return page_to_phys(page);
+#else
 	return page_to_phys(page) | 0x80000000;
+#endif
 }
 
 static inline unsigned long plat_dma_addr_to_phys(struct device *dev,
 	dma_addr_t dma_addr)
 {
-#if defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
+#if defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_64BIT)
+	return dma_addr;
+#elif defined(CONFIG_CPU_LOONGSON2F) && defined(CONFIG_64BIT)
 	return (dma_addr > 0x8fffffff) ? dma_addr : (dma_addr & 0x0fffffff);
 #else
 	return dma_addr & 0x7fffffff;
@@ -55,7 +71,11 @@ static inline int plat_dma_supported(struct device *dev, u64 mask)
 
 static inline int plat_device_is_coherent(struct device *dev)
 {
+#ifdef CONFIG_DMA_NONCOHERENT
 	return 0;
+#else
+	return 1;
+#endif /* CONFIG_DMA_NONCOHERENT */
 }
 
 #endif /* __ASM_MACH_LOONGSON_DMA_COHERENCE_H */