forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
2.4 KiB
101 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Based on arch/arm/mm/ioremap.c |
|
* |
|
* (C) Copyright 1995 1996 Linus Torvalds |
|
* Hacked for ARM by Phil Blundell <[email protected]> |
|
* Hacked to allow all architectures to build, and various cleanups |
|
* by Russell King |
|
* Copyright (C) 2012 ARM Ltd. |
|
*/ |
|
|
|
#include <linux/export.h> |
|
#include <linux/mm.h> |
|
#include <linux/vmalloc.h> |
|
#include <linux/io.h> |
|
|
|
#include <asm/fixmap.h> |
|
#include <asm/tlbflush.h> |
|
|
|
static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size, |
|
pgprot_t prot, void *caller) |
|
{ |
|
unsigned long last_addr; |
|
unsigned long offset = phys_addr & ~PAGE_MASK; |
|
int err; |
|
unsigned long addr; |
|
struct vm_struct *area; |
|
|
|
/* |
|
* Page align the mapping address and size, taking account of any |
|
* offset. |
|
*/ |
|
phys_addr &= PAGE_MASK; |
|
size = PAGE_ALIGN(size + offset); |
|
|
|
/* |
|
* Don't allow wraparound, zero size or outside PHYS_MASK. |
|
*/ |
|
last_addr = phys_addr + size - 1; |
|
if (!size || last_addr < phys_addr || (last_addr & ~PHYS_MASK)) |
|
return NULL; |
|
|
|
/* |
|
* Don't allow RAM to be mapped. |
|
*/ |
|
if (WARN_ON(pfn_is_map_memory(__phys_to_pfn(phys_addr)))) |
|
return NULL; |
|
|
|
area = get_vm_area_caller(size, VM_IOREMAP, caller); |
|
if (!area) |
|
return NULL; |
|
addr = (unsigned long)area->addr; |
|
area->phys_addr = phys_addr; |
|
|
|
err = ioremap_page_range(addr, addr + size, phys_addr, prot); |
|
if (err) { |
|
vunmap((void *)addr); |
|
return NULL; |
|
} |
|
|
|
return (void __iomem *)(offset + addr); |
|
} |
|
|
|
void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot) |
|
{ |
|
return __ioremap_caller(phys_addr, size, prot, |
|
__builtin_return_address(0)); |
|
} |
|
EXPORT_SYMBOL(__ioremap); |
|
|
|
void iounmap(volatile void __iomem *io_addr) |
|
{ |
|
unsigned long addr = (unsigned long)io_addr & PAGE_MASK; |
|
|
|
/* |
|
* We could get an address outside vmalloc range in case |
|
* of ioremap_cache() reusing a RAM mapping. |
|
*/ |
|
if (is_vmalloc_addr((void *)addr)) |
|
vunmap((void *)addr); |
|
} |
|
EXPORT_SYMBOL(iounmap); |
|
|
|
void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size) |
|
{ |
|
/* For normal memory we already have a cacheable mapping. */ |
|
if (pfn_is_map_memory(__phys_to_pfn(phys_addr))) |
|
return (void __iomem *)__phys_to_virt(phys_addr); |
|
|
|
return __ioremap_caller(phys_addr, size, __pgprot(PROT_NORMAL), |
|
__builtin_return_address(0)); |
|
} |
|
EXPORT_SYMBOL(ioremap_cache); |
|
|
|
/* |
|
* Must be called after early_fixmap_init |
|
*/ |
|
void __init early_ioremap_init(void) |
|
{ |
|
early_ioremap_setup(); |
|
}
|
|
|