63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/pgtable.h>
|
|
|
|
void __iomem *ioremap(phys_addr_t addr, size_t size)
|
|
{
|
|
phys_addr_t last_addr;
|
|
unsigned long offset, vaddr;
|
|
struct vm_struct *area;
|
|
pgprot_t prot;
|
|
|
|
last_addr = addr + size - 1;
|
|
if (!size || last_addr < addr)
|
|
return NULL;
|
|
|
|
offset = addr & (~PAGE_MASK);
|
|
addr &= PAGE_MASK;
|
|
size = PAGE_ALIGN(size + offset);
|
|
|
|
area = get_vm_area_caller(size, VM_ALLOC, __builtin_return_address(0));
|
|
if (!area)
|
|
return NULL;
|
|
|
|
vaddr = (unsigned long)area->addr;
|
|
|
|
prot = __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE |
|
|
_PAGE_GLOBAL | _CACHE_UNCACHED | _PAGE_SO);
|
|
|
|
if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
|
|
free_vm_area(area);
|
|
return NULL;
|
|
}
|
|
|
|
return (void __iomem *)(vaddr + offset);
|
|
}
|
|
EXPORT_SYMBOL(ioremap);
|
|
|
|
void iounmap(void __iomem *addr)
|
|
{
|
|
vunmap((void *)((unsigned long)addr & PAGE_MASK));
|
|
}
|
|
EXPORT_SYMBOL(iounmap);
|
|
|
|
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
|
|
unsigned long size, pgprot_t vma_prot)
|
|
{
|
|
if (!pfn_valid(pfn)) {
|
|
vma_prot.pgprot |= _PAGE_SO;
|
|
return pgprot_noncached(vma_prot);
|
|
} else if (file->f_flags & O_SYNC) {
|
|
return pgprot_noncached(vma_prot);
|
|
}
|
|
|
|
return vma_prot;
|
|
}
|
|
EXPORT_SYMBOL(phys_mem_access_prot);
|