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
17void __iomem *ioremap(unsigned long paddr, unsigned long size)
18{
19	unsigned long end;
 
 
 
 
 
20
21	/* Don't allow wraparound or zero size */
22	end = paddr + size - 1;
23	if (!size || (end < paddr))
24		return NULL;
25
26	/* If the region is h/w uncached, avoid MMU mappings */
27	if (paddr >= ARC_UNCACHED_ADDR_SPACE)
28		return (void __iomem *)paddr;
29
30	return ioremap_prot(paddr, size, PAGE_KERNEL_NO_CACHE);
 
 
 
 
 
 
 
 
 
 
31}
32EXPORT_SYMBOL(ioremap);
33
34/*
35 * ioremap with access flags
36 * Cache semantics wise it is same as ioremap - "forced" uncached.
37 * However unline vanilla ioremap which bypasses ARC MMU for addresses in
38 * ARC hardware uncached region, this one still goes thru the MMU as caller
39 * might need finer access control (R/W/X)
40 */
41void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
42			   unsigned long flags)
43{
44	void __iomem *vaddr;
45	struct vm_struct *area;
46	unsigned long off, end;
47	pgprot_t prot = __pgprot(flags);
48
49	/* Don't allow wraparound, zero size */
50	end = paddr + size - 1;
51	if ((!size) || (end < paddr))
52		return NULL;
53
54	/* An early platform driver might end up here */
55	if (!slab_is_available())
56		return NULL;
57
58	/* force uncached */
59	prot = pgprot_noncached(prot);
60
61	/* Mappings have to be page-aligned */
62	off = paddr & ~PAGE_MASK;
63	paddr &= PAGE_MASK;
64	size = PAGE_ALIGN(end + 1) - paddr;
65
66	/*
67	 * Ok, go for it..
68	 */
69	area = get_vm_area(size, VM_IOREMAP);
70	if (!area)
71		return NULL;
72	area->phys_addr = paddr;
73	vaddr = (void __iomem *)area->addr;
74	if (ioremap_page_range((unsigned long)vaddr,
75			       (unsigned long)vaddr + size, paddr, prot)) {
76		vunmap((void __force *)vaddr);
77		return NULL;
78	}
79	return (void __iomem *)(off + (char __iomem *)vaddr);
80}
81EXPORT_SYMBOL(ioremap_prot);
82
83
84void iounmap(const void __iomem *addr)
85{
86	if (addr >= (void __force __iomem *)ARC_UNCACHED_ADDR_SPACE)
 
87		return;
88
89	vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
90}
91EXPORT_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);