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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/mips/loongson/common/dma-swiotlb.c
Initial import
Diffstat (limited to 'arch/mips/loongson/common/dma-swiotlb.c')
-rw-r--r--arch/mips/loongson/common/dma-swiotlb.c150
1 files changed, 150 insertions, 0 deletions
diff --git a/arch/mips/loongson/common/dma-swiotlb.c b/arch/mips/loongson/common/dma-swiotlb.c
new file mode 100644
index 000000000..2c6b989c1
--- /dev/null
+++ b/arch/mips/loongson/common/dma-swiotlb.c
@@ -0,0 +1,150 @@
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+#include <linux/swiotlb.h>
+#include <linux/bootmem.h>
+
+#include <asm/bootinfo.h>
+#include <boot_param.h>
+#include <dma-coherence.h>
+
+static void *loongson_dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
+{
+ void *ret;
+
+ if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
+ return ret;
+
+ /* ignore region specifiers */
+ gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
+
+#ifdef CONFIG_ISA
+ if (dev == NULL)
+ gfp |= __GFP_DMA;
+ else
+#endif
+#ifdef CONFIG_ZONE_DMA
+ if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
+ gfp |= __GFP_DMA;
+ else
+#endif
+#ifdef CONFIG_ZONE_DMA32
+ if (dev->coherent_dma_mask < DMA_BIT_MASK(40))
+ gfp |= __GFP_DMA32;
+ else
+#endif
+ ;
+ gfp |= __GFP_NORETRY;
+
+ ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
+ mb();
+ return ret;
+}
+
+static void loongson_dma_free_coherent(struct device *dev, size_t size,
+ void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs)
+{
+ int order = get_order(size);
+
+ if (dma_release_from_coherent(dev, order, vaddr))
+ return;
+
+ swiotlb_free_coherent(dev, size, vaddr, dma_handle);
+}
+
+static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
+ dir, attrs);
+ mb();
+ return daddr;
+}
+
+static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, NULL);
+ mb();
+
+ return r;
+}
+
+static void loongson_dma_sync_single_for_device(struct device *dev,
+ dma_addr_t dma_handle, size_t size,
+ enum dma_data_direction dir)
+{
+ swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
+ mb();
+}
+
+static void loongson_dma_sync_sg_for_device(struct device *dev,
+ struct scatterlist *sg, int nents,
+ enum dma_data_direction dir)
+{
+ swiotlb_sync_sg_for_device(dev, sg, nents, dir);
+ mb();
+}
+
+static int loongson_dma_set_mask(struct device *dev, u64 mask)
+{
+ if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) {
+ *dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits);
+ return -EIO;
+ }
+
+ *dev->dma_mask = mask;
+
+ return 0;
+}
+
+dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+ long nid;
+#ifdef CONFIG_PHYS48_TO_HT40
+ /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
+ * Loongson-3's 48bit address space and embed it into 40bit */
+ nid = (paddr >> 44) & 0x3;
+ paddr = ((nid << 44) ^ paddr) | (nid << 37);
+#endif
+ return paddr;
+}
+
+phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+ long nid;
+#ifdef CONFIG_PHYS48_TO_HT40
+ /* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
+ * Loongson-3's 48bit address space and embed it into 40bit */
+ nid = (daddr >> 37) & 0x3;
+ daddr = ((nid << 37) ^ daddr) | (nid << 44);
+#endif
+ return daddr;
+}
+
+static struct dma_map_ops loongson_dma_map_ops = {
+ .alloc = loongson_dma_alloc_coherent,
+ .free = loongson_dma_free_coherent,
+ .map_page = loongson_dma_map_page,
+ .unmap_page = swiotlb_unmap_page,
+ .map_sg = loongson_dma_map_sg,
+ .unmap_sg = swiotlb_unmap_sg_attrs,
+ .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
+ .sync_single_for_device = loongson_dma_sync_single_for_device,
+ .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
+ .sync_sg_for_device = loongson_dma_sync_sg_for_device,
+ .mapping_error = swiotlb_dma_mapping_error,
+ .dma_supported = swiotlb_dma_supported,
+ .set_dma_mask = loongson_dma_set_mask
+};
+
+void __init plat_swiotlb_setup(void)
+{
+ swiotlb_init(1);
+ mips_dma_map_ops = &loongson_dma_map_ops;
+}