1 files changed, 48 insertions, 0 deletions

diff --git a/arch/csky/mm/ioremap.c b/arch/csky/mm/ioremap.c
new file mode 100644
index 000000000000..7ad3ff103f4a
--- /dev/null
+++ b/arch/csky/mm/ioremap.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/io.h>
+
+#include <asm/pgtable.h>
+
+void __iomem *ioremap(phys_addr_t addr, size_t size)
+{
+        phys_addr_t last_addr;
+        unsigned long offset, vaddr;
+        struct vm_struct *area;
+        pgprot_t prot;
+
+        last_addr = addr + size - 1;
+        if (!size || last_addr < addr)
+                return NULL;
+
+        offset = addr & (~PAGE_MASK);
+        addr &= PAGE_MASK;
+        size = PAGE_ALIGN(size + offset);
+
+        area = get_vm_area_caller(size, VM_ALLOC, __builtin_return_address(0));
+        if (!area)
+                return NULL;
+
+        vaddr = (unsigned long)area->addr;
+
+        prot = __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE |
+                        _PAGE_GLOBAL | _CACHE_UNCACHED);
+
+        if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
+                free_vm_area(area);
+                return NULL;
+        }
+
+        return (void __iomem *)(vaddr + offset);
+}
+EXPORT_SYMBOL(ioremap);
+
+void iounmap(void __iomem *addr)
+{
+        vunmap((void *)((unsigned long)addr & PAGE_MASK));
+}
+EXPORT_SYMBOL(iounmap);