1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ioremap implementation.
4 *
5 * Copyright (C) 2015 Cadence Design Systems Inc.
6 */
7
8 #include <linux/io.h>
9 #include <linux/vmalloc.h>
10 #include <asm/cacheflush.h>
11 #include <asm/io.h>
12 #include <asm/pgtable.h>
13
xtensa_ioremap(unsigned long paddr,unsigned long size,pgprot_t prot)14 static void __iomem *xtensa_ioremap(unsigned long paddr, unsigned long size,
15 pgprot_t prot)
16 {
17 unsigned long offset = paddr & ~PAGE_MASK;
18 unsigned long pfn = __phys_to_pfn(paddr);
19 struct vm_struct *area;
20 unsigned long vaddr;
21 int err;
22
23 paddr &= PAGE_MASK;
24
25 WARN_ON(pfn_valid(pfn));
26
27 size = PAGE_ALIGN(offset + size);
28
29 area = get_vm_area(size, VM_IOREMAP);
30 if (!area)
31 return NULL;
32
33 vaddr = (unsigned long)area->addr;
34 area->phys_addr = paddr;
35
36 err = ioremap_page_range(vaddr, vaddr + size, paddr, prot);
37
38 if (err) {
39 vunmap((void *)vaddr);
40 return NULL;
41 }
42
43 flush_cache_vmap(vaddr, vaddr + size);
44 return (void __iomem *)(offset + vaddr);
45 }
46
xtensa_ioremap_nocache(unsigned long addr,unsigned long size)47 void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size)
48 {
49 return xtensa_ioremap(addr, size, pgprot_noncached(PAGE_KERNEL));
50 }
51 EXPORT_SYMBOL(xtensa_ioremap_nocache);
52
xtensa_ioremap_cache(unsigned long addr,unsigned long size)53 void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size)
54 {
55 return xtensa_ioremap(addr, size, PAGE_KERNEL);
56 }
57 EXPORT_SYMBOL(xtensa_ioremap_cache);
58
xtensa_iounmap(volatile void __iomem * io_addr)59 void xtensa_iounmap(volatile void __iomem *io_addr)
60 {
61 void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
62
63 vunmap(addr);
64 }
65 EXPORT_SYMBOL(xtensa_iounmap);
66
