45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* I/O remap functions for Hexagon
|
|
*
|
|
* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/mm.h>
|
|
|
|
void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
|
|
{
|
|
unsigned long last_addr, addr;
|
|
unsigned long offset = phys_addr & ~PAGE_MASK;
|
|
struct vm_struct *area;
|
|
|
|
pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
|
|
|(__HEXAGON_C_DEV << 6));
|
|
|
|
last_addr = phys_addr + size - 1;
|
|
|
|
/* Wrapping not allowed */
|
|
if (!size || (last_addr < phys_addr))
|
|
return NULL;
|
|
|
|
/* Rounds up to next page size, including whole-page offset */
|
|
size = PAGE_ALIGN(offset + size);
|
|
|
|
area = get_vm_area(size, VM_IOREMAP);
|
|
addr = (unsigned long)area->addr;
|
|
|
|
if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
|
|
vunmap((void *)addr);
|
|
return NULL;
|
|
}
|
|
|
|
return (void __iomem *) (offset + addr);
|
|
}
|
|
|
|
void iounmap(const volatile void __iomem *addr)
|
|
{
|
|
vunmap((void *) ((unsigned long) addr & PAGE_MASK));
|
|
}
|