Greentime Hu | 4a64f68 | 2017-10-24 16:21:01 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // Copyright (C) 2005-2017 Andes Technology Corporation |
| 3 | |
| 4 | #include <linux/vmalloc.h> |
| 5 | #include <linux/io.h> |
| 6 | #include <linux/mm.h> |
| 7 | #include <asm/pgtable.h> |
| 8 | |
| 9 | void __iomem *ioremap(phys_addr_t phys_addr, size_t size); |
| 10 | |
| 11 | static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size, |
| 12 | void *caller) |
| 13 | { |
| 14 | struct vm_struct *area; |
| 15 | unsigned long addr, offset, last_addr; |
| 16 | pgprot_t prot; |
| 17 | |
| 18 | /* Don't allow wraparound or zero size */ |
| 19 | last_addr = phys_addr + size - 1; |
| 20 | if (!size || last_addr < phys_addr) |
| 21 | return NULL; |
| 22 | |
| 23 | /* |
| 24 | * Mappings have to be page-aligned |
| 25 | */ |
| 26 | offset = phys_addr & ~PAGE_MASK; |
| 27 | phys_addr &= PAGE_MASK; |
| 28 | size = PAGE_ALIGN(last_addr + 1) - phys_addr; |
| 29 | |
| 30 | /* |
| 31 | * Ok, go for it.. |
| 32 | */ |
| 33 | area = get_vm_area_caller(size, VM_IOREMAP, caller); |
| 34 | if (!area) |
| 35 | return NULL; |
| 36 | |
| 37 | area->phys_addr = phys_addr; |
| 38 | addr = (unsigned long)area->addr; |
| 39 | prot = __pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D | |
| 40 | _PAGE_G | _PAGE_C_DEV); |
| 41 | if (ioremap_page_range(addr, addr + size, phys_addr, prot)) { |
| 42 | vunmap((void *)addr); |
| 43 | return NULL; |
| 44 | } |
| 45 | return (__force void __iomem *)(offset + (char *)addr); |
| 46 | |
| 47 | } |
| 48 | |
| 49 | void __iomem *ioremap(phys_addr_t phys_addr, size_t size) |
| 50 | { |
| 51 | return __ioremap_caller(phys_addr, size, |
| 52 | __builtin_return_address(0)); |
| 53 | } |
| 54 | |
| 55 | EXPORT_SYMBOL(ioremap); |
| 56 | |
| 57 | void iounmap(volatile void __iomem * addr) |
| 58 | { |
| 59 | vunmap((void *)(PAGE_MASK & (unsigned long)addr)); |
| 60 | } |
| 61 | |
| 62 | EXPORT_SYMBOL(iounmap); |