69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
|
|
* ioremap implementation.
|
|
*
|
|
* Copyright (C) 2015 Cadence Design Systems Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/io.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
static void __iomem *xtensa_ioremap(unsigned long paddr, unsigned long size,
|
|
pgprot_t prot)
|
|
{
|
|
unsigned long offset = paddr & ~PAGE_MASK;
|
|
unsigned long pfn = __phys_to_pfn(paddr);
|
|
struct vm_struct *area;
|
|
unsigned long vaddr;
|
|
int err;
|
|
|
|
paddr &= PAGE_MASK;
|
|
|
|
WARN_ON(pfn_valid(pfn));
|
|
|
|
size = PAGE_ALIGN(offset + size);
|
|
|
|
area = get_vm_area(size, VM_IOREMAP);
|
|
if (!area)
|
|
return NULL;
|
|
|
|
vaddr = (unsigned long)area->addr;
|
|
area->phys_addr = paddr;
|
|
|
|
err = ioremap_page_range(vaddr, vaddr + size, paddr, prot);
|
|
|
|
if (err) {
|
|
vunmap((void *)vaddr);
|
|
return NULL;
|
|
}
|
|
|
|
flush_cache_vmap(vaddr, vaddr + size);
|
|
return (void __iomem *)(offset + vaddr);
|
|
}
|
|
|
|
void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size)
|
|
{
|
|
return xtensa_ioremap(addr, size, pgprot_noncached(PAGE_KERNEL));
|
|
}
|
|
EXPORT_SYMBOL(xtensa_ioremap_nocache);
|
|
|
|
void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size)
|
|
{
|
|
return xtensa_ioremap(addr, size, PAGE_KERNEL);
|
|
}
|
|
EXPORT_SYMBOL(xtensa_ioremap_cache);
|
|
|
|
void xtensa_iounmap(volatile void __iomem *io_addr)
|
|
{
|
|
void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
|
|
|
|
vunmap(addr);
|
|
}
|
|
EXPORT_SYMBOL(xtensa_iounmap);
|