1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
6 #include <linux/vmalloc.h>
7 #include <linux/init.h>
8 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/cache.h>
14 static inline bool arc_uncached_addr_space(phys_addr_t paddr)
16 if (is_isa_arcompact()) {
17 if (paddr >= ARC_UNCACHED_ADDR_SPACE)
19 } else if (paddr >= perip_base && paddr <= perip_end) {
26 void __iomem *ioremap(phys_addr_t paddr, unsigned long size)
30 /* Don't allow wraparound or zero size */
31 end = paddr + size - 1;
32 if (!size || (end < paddr))
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
39 if (arc_uncached_addr_space(paddr))
40 return (void __iomem *)(u32)paddr;
42 return ioremap_prot(paddr, size,
43 pgprot_val(pgprot_noncached(PAGE_KERNEL)));
45 EXPORT_SYMBOL(ioremap);
48 * ioremap with access flags
49 * Cache semantics wise it is same as ioremap - "forced" uncached.
50 * However unlike vanilla ioremap which bypasses ARC MMU for addresses in
51 * ARC hardware uncached region, this one still goes thru the MMU as caller
52 * might need finer access control (R/W/X)
54 void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
59 struct vm_struct *area;
61 pgprot_t prot = __pgprot(flags);
63 /* Don't allow wraparound, zero size */
64 end = paddr + size - 1;
65 if ((!size) || (end < paddr))
68 /* An early platform driver might end up here */
69 if (!slab_is_available())
73 prot = pgprot_noncached(prot);
75 /* Mappings have to be page-aligned */
76 off = paddr & ~PAGE_MASK;
77 paddr &= PAGE_MASK_PHYS;
78 size = PAGE_ALIGN(end + 1) - paddr;
83 area = get_vm_area(size, VM_IOREMAP);
86 area->phys_addr = paddr;
87 vaddr = (unsigned long)area->addr;
88 if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) {
89 vunmap((void __force *)vaddr);
92 return (void __iomem *)(off + (char __iomem *)vaddr);
94 EXPORT_SYMBOL(ioremap_prot);
97 void iounmap(const void __iomem *addr)
99 /* weird double cast to handle phys_addr_t > 32 bits */
100 if (arc_uncached_addr_space((phys_addr_t)(u32)addr))
103 vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
105 EXPORT_SYMBOL(iounmap);