[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/arch/mn10300/mm/dma-alloc.c b/src/kernel/linux/v4.14/arch/mn10300/mm/dma-alloc.c
new file mode 100644
index 0000000..86108d2
--- /dev/null
+++ b/src/kernel/linux/v4.14/arch/mn10300/mm/dma-alloc.c
@@ -0,0 +1,131 @@
+/* MN10300 Dynamic DMA mapping support
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ * Derived from: arch/i386/kernel/pci-dma.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/gfp.h>
+#include <linux/export.h>
+#include <asm/io.h>
+
+static unsigned long pci_sram_allocated = 0xbc000000;
+
+static void *mn10300_dma_alloc(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
+{
+ unsigned long addr;
+ void *ret;
+
+ pr_debug("dma_alloc_coherent(%s,%zu,%x)\n",
+ dev ? dev_name(dev) : "?", size, gfp);
+
+ if (0xbe000000 - pci_sram_allocated >= size) {
+ size = (size + 255) & ~255;
+ addr = pci_sram_allocated;
+ pci_sram_allocated += size;
+ ret = (void *) addr;
+ goto done;
+ }
+
+ /* ignore region specifiers */
+ gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
+
+ if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
+ gfp |= GFP_DMA;
+
+ addr = __get_free_pages(gfp, get_order(size));
+ if (!addr)
+ return NULL;
+
+ /* map the coherent memory through the uncached memory window */
+ ret = (void *) (addr | 0x20000000);
+
+ /* fill the memory with obvious rubbish */
+ memset((void *) addr, 0xfb, size);
+
+ /* write back and evict all cache lines covering this region */
+ mn10300_dcache_flush_inv_range2(virt_to_phys((void *) addr), PAGE_SIZE);
+
+done:
+ *dma_handle = virt_to_bus((void *) addr);
+ printk("dma_alloc_coherent() = %p [%x]\n", ret, *dma_handle);
+ return ret;
+}
+
+static void mn10300_dma_free(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle, unsigned long attrs)
+{
+ unsigned long addr = (unsigned long) vaddr & ~0x20000000;
+
+ if (addr >= 0x9c000000)
+ return;
+
+ free_pages(addr, get_order(size));
+}
+
+static int mn10300_dma_map_sg(struct device *dev, struct scatterlist *sglist,
+ int nents, enum dma_data_direction direction,
+ unsigned long attrs)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sglist, sg, nents, i) {
+ BUG_ON(!sg_page(sg));
+
+ sg->dma_address = sg_phys(sg);
+ }
+
+ mn10300_dcache_flush_inv();
+ return nents;
+}
+
+static dma_addr_t mn10300_dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction direction, unsigned long attrs)
+{
+ return page_to_bus(page) + offset;
+}
+
+static void mn10300_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+ size_t size, enum dma_data_direction direction)
+{
+ mn10300_dcache_flush_inv();
+}
+
+static void mn10300_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+ int nelems, enum dma_data_direction direction)
+{
+ mn10300_dcache_flush_inv();
+}
+
+static int mn10300_dma_supported(struct device *dev, u64 mask)
+{
+ /*
+ * we fall back to GFP_DMA when the mask isn't all 1s, so we can't
+ * guarantee allocations that must be within a tighter range than
+ * GFP_DMA
+ */
+ if (mask < 0x00ffffff)
+ return 0;
+ return 1;
+}
+
+const struct dma_map_ops mn10300_dma_ops = {
+ .alloc = mn10300_dma_alloc,
+ .free = mn10300_dma_free,
+ .map_page = mn10300_dma_map_page,
+ .map_sg = mn10300_dma_map_sg,
+ .sync_single_for_device = mn10300_dma_sync_single_for_device,
+ .sync_sg_for_device = mn10300_dma_sync_sg_for_device,
+};