1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * I/O remap functions for Hexagon
4  *
5  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6  */
7 
8 #include <linux/io.h>
9 #include <linux/vmalloc.h>
10 #include <linux/mm.h>
11 
ioremap_nocache(unsigned long phys_addr,unsigned long size)12 void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size)
13 {
14 	unsigned long last_addr, addr;
15 	unsigned long offset = phys_addr & ~PAGE_MASK;
16 	struct vm_struct *area;
17 
18 	pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
19 					|(__HEXAGON_C_DEV << 6));
20 
21 	last_addr = phys_addr + size - 1;
22 
23 	/*  Wrapping not allowed  */
24 	if (!size || (last_addr < phys_addr))
25 		return NULL;
26 
27 	/*  Rounds up to next page size, including whole-page offset */
28 	size = PAGE_ALIGN(offset + size);
29 
30 	area = get_vm_area(size, VM_IOREMAP);
31 	addr = (unsigned long)area->addr;
32 
33 	if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
34 		vunmap((void *)addr);
35 		return NULL;
36 	}
37 
38 	return (void __iomem *) (offset + addr);
39 }
40 
__iounmap(const volatile void __iomem * addr)41 void __iounmap(const volatile void __iomem *addr)
42 {
43 	vunmap((void *) ((unsigned long) addr & PAGE_MASK));
44 }
45