1 files changed, 44 insertions, 0 deletions
diff --git a/arch/hexagon/mm/ioremap.c b/arch/hexagon/mm/ioremap.c
new file mode 100644
index 000000000..255c5b1ee
--- /dev/null
+++ b/arch/hexagon/mm/ioremap.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * I/O remap functions for Hexagon
+ *
+ * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/io.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+
+void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
+{
+	unsigned long last_addr, addr;
+	unsigned long offset = phys_addr & ~PAGE_MASK;
+	struct vm_struct *area;
+
+	pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
+					|(__HEXAGON_C_DEV << 6));
+
+	last_addr = phys_addr + size - 1;
+
+	/*  Wrapping not allowed  */
+	if (!size || (last_addr < phys_addr))
+		return NULL;
+
+	/*  Rounds up to next page size, including whole-page offset */
+	size = PAGE_ALIGN(offset + size);
+
+	area = get_vm_area(size, VM_IOREMAP);
+	addr = (unsigned long)area->addr;
+
+	if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
+		vunmap((void *)addr);
+		return NULL;
+	}
+
+	return (void __iomem *) (offset + addr);
+}
+
+void iounmap(const volatile void __iomem *addr)
+{
+	vunmap((void *) ((unsigned long) addr & PAGE_MASK));
+}