1/*
  2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  3 *
  4 * This program is free software; you can redistribute it and/or modify
  5 * it under the terms of the GNU General Public License version 2 as
  6 * published by the Free Software Foundation.
  7 */
  8
  9#include <linux/vmalloc.h>
 10#include <linux/init.h>
 11#include <linux/module.h>
 12#include <linux/io.h>
 13#include <linux/mm.h>
 14#include <linux/slab.h>
 15#include <linux/cache.h>
 16
 17static inline bool arc_uncached_addr_space(phys_addr_t paddr)
 18{
 19	if (is_isa_arcompact()) {
 20		if (paddr >= ARC_UNCACHED_ADDR_SPACE)
 21			return true;
 22	} else if (paddr >= perip_base && paddr <= perip_end) {
 23		return true;
 24	}
 25
 26	return false;
 27}
 28
 29void __iomem *ioremap(phys_addr_t paddr, unsigned long size)
 30{
 31	phys_addr_t end;
 32
 33	/* Don't allow wraparound or zero size */
 34	end = paddr + size - 1;
 35	if (!size || (end < paddr))
 36		return NULL;
 37
 38	/*
 39	 * If the region is h/w uncached, MMU mapping can be elided as optim
 40	 * The cast to u32 is fine as this region can only be inside 4GB
 41	 */
 42	if (arc_uncached_addr_space(paddr))
 43		return (void __iomem *)(u32)paddr;
 44
 45	return ioremap_prot(paddr, size, PAGE_KERNEL_NO_CACHE);
 
 46}
 47EXPORT_SYMBOL(ioremap);
 48
 49/*
 50 * ioremap with access flags
 51 * Cache semantics wise it is same as ioremap - "forced" uncached.
 52 * However unlike vanilla ioremap which bypasses ARC MMU for addresses in
 53 * ARC hardware uncached region, this one still goes thru the MMU as caller
 54 * might need finer access control (R/W/X)
 55 */
 56void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
 57			   unsigned long flags)
 58{
 59	unsigned long vaddr;
 60	struct vm_struct *area;
 61	phys_addr_t off, end;
 62	pgprot_t prot = __pgprot(flags);
 63
 64	/* Don't allow wraparound, zero size */
 65	end = paddr + size - 1;
 66	if ((!size) || (end < paddr))
 67		return NULL;
 68
 69	/* An early platform driver might end up here */
 70	if (!slab_is_available())
 71		return NULL;
 72
 73	/* force uncached */
 74	prot = pgprot_noncached(prot);
 75
 76	/* Mappings have to be page-aligned */
 77	off = paddr & ~PAGE_MASK;
 78	paddr &= PAGE_MASK;
 79	size = PAGE_ALIGN(end + 1) - paddr;
 80
 81	/*
 82	 * Ok, go for it..
 83	 */
 84	area = get_vm_area(size, VM_IOREMAP);
 85	if (!area)
 86		return NULL;
 87	area->phys_addr = paddr;
 88	vaddr = (unsigned long)area->addr;
 89	if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) {
 90		vunmap((void __force *)vaddr);
 91		return NULL;
 92	}
 93	return (void __iomem *)(off + (char __iomem *)vaddr);
 94}
 95EXPORT_SYMBOL(ioremap_prot);
 96
 97
 98void iounmap(const void __iomem *addr)
 99{
100	/* weird double cast to handle phys_addr_t > 32 bits */
101	if (arc_uncached_addr_space((phys_addr_t)(u32)addr))
102		return;
103
104	vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
105}
106EXPORT_SYMBOL(iounmap);

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 
 
 
 
 4 */
 5
 6#include <linux/vmalloc.h>
 7#include <linux/init.h>
 8#include <linux/module.h>
 9#include <linux/io.h>
10#include <linux/mm.h>
 
11#include <linux/cache.h>
12
13static inline bool arc_uncached_addr_space(phys_addr_t paddr)
14{
15	if (is_isa_arcompact()) {
16		if (paddr >= ARC_UNCACHED_ADDR_SPACE)
17			return true;
18	} else if (paddr >= perip_base && paddr <= perip_end) {
19		return true;
20	}
21
22	return false;
23}
24
25void __iomem *ioremap(phys_addr_t paddr, unsigned long size)
26{
 
 
 
 
 
 
 
27	/*
28	 * If the region is h/w uncached, MMU mapping can be elided as optim
29	 * The cast to u32 is fine as this region can only be inside 4GB
30	 */
31	if (arc_uncached_addr_space(paddr))
32		return (void __iomem *)(u32)paddr;
33
34	return ioremap_prot(paddr, size,
35			    pgprot_val(pgprot_noncached(PAGE_KERNEL)));
36}
37EXPORT_SYMBOL(ioremap);
38
39/*
40 * ioremap with access flags
41 * Cache semantics wise it is same as ioremap - "forced" uncached.
42 * However unlike vanilla ioremap which bypasses ARC MMU for addresses in
43 * ARC hardware uncached region, this one still goes thru the MMU as caller
44 * might need finer access control (R/W/X)
45 */
46void __iomem *ioremap_prot(phys_addr_t paddr, size_t size,
47			   unsigned long flags)
48{
 
 
 
49	pgprot_t prot = __pgprot(flags);
50
 
 
 
 
 
 
 
 
 
51	/* force uncached */
52	return generic_ioremap_prot(paddr, size, pgprot_noncached(prot));
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
53}
54EXPORT_SYMBOL(ioremap_prot);
55
56void iounmap(volatile void __iomem *addr)
 
57{
58	/* weird double cast to handle phys_addr_t > 32 bits */
59	if (arc_uncached_addr_space((phys_addr_t)(u32)addr))
60		return;
61
62	generic_iounmap(addr);
63}
64EXPORT_SYMBOL(iounmap);