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