[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/arch/m68k/sun3/dvma.c b/src/kernel/linux/v4.14/arch/m68k/sun3/dvma.c
new file mode 100644
index 0000000..5f92c72
--- /dev/null
+++ b/src/kernel/linux/v4.14/arch/m68k/sun3/dvma.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/arch/m68k/sun3/dvma.c
+ *
+ * Written by Sam Creasey
+ *
+ * Sun3 IOMMU routines used for dvma accesses.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/list.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/sun3mmu.h>
+#include <asm/dvma.h>
+
+
+static unsigned long ptelist[120];
+
+static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
+{
+ unsigned long pte;
+ unsigned long j;
+ pte_t ptep;
+
+ j = *(volatile unsigned long *)kaddr;
+ *(volatile unsigned long *)kaddr = j;
+
+ ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
+ pte = pte_val(ptep);
+// pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
+ if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
+ sun3_put_pte(vaddr, pte);
+ ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
+ }
+
+ return (vaddr + (kaddr & ~PAGE_MASK));
+
+}
+
+int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
+ int len)
+{
+
+ unsigned long end;
+ unsigned long vaddr;
+
+ vaddr = dvma_btov(baddr);
+
+ end = vaddr + len;
+
+ while(vaddr < end) {
+ dvma_page(kaddr, vaddr);
+ kaddr += PAGE_SIZE;
+ vaddr += PAGE_SIZE;
+ }
+
+ return 0;
+
+}
+
+void __init sun3_dvma_init(void)
+{
+ memset(ptelist, 0, sizeof(ptelist));
+}