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kernel add
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/*
* (c) Copyright 2006, 2007 Hewlett-Packard Development Company, L.P.
* Bjorn Helgaas <bjorn.helgaas@hp.com>
*
* 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/compiler.h>
#include <linux/module.h>
#include <linux/efi.h>
#include <linux/io.h>
#include <linux/vmalloc.h>
#include <asm/io.h>
#include <asm/meminit.h>
static inline void __iomem *
__ioremap_uc(unsigned long phys_addr)
{
return (void __iomem *) (__IA64_UNCACHED_OFFSET | phys_addr);
}
void __iomem *
early_ioremap (unsigned long phys_addr, unsigned long size)
{
u64 attr;
attr = kern_mem_attribute(phys_addr, size);
if (attr & EFI_MEMORY_WB)
return (void __iomem *) phys_to_virt(phys_addr);
return __ioremap_uc(phys_addr);
}
void __iomem *
ioremap (unsigned long phys_addr, unsigned long size)
{
void __iomem *addr;
struct vm_struct *area;
unsigned long offset;
pgprot_t prot;
u64 attr;
unsigned long gran_base, gran_size;
unsigned long page_base;
/*
* For things in kern_memmap, we must use the same attribute
* as the rest of the kernel. For more details, see
* Documentation/ia64/aliasing.txt.
*/
attr = kern_mem_attribute(phys_addr, size);
if (attr & EFI_MEMORY_WB)
return (void __iomem *) phys_to_virt(phys_addr);
else if (attr & EFI_MEMORY_UC)
return __ioremap_uc(phys_addr);
/*
* Some chipsets don't support UC access to memory. If
* WB is supported for the whole granule, we prefer that.
*/
gran_base = GRANULEROUNDDOWN(phys_addr);
gran_size = GRANULEROUNDUP(phys_addr + size) - gran_base;
if (efi_mem_attribute(gran_base, gran_size) & EFI_MEMORY_WB)
return (void __iomem *) phys_to_virt(phys_addr);
/*
* WB is not supported for the whole granule, so we can't use
* the region 7 identity mapping. If we can safely cover the
* area with kernel page table mappings, we can use those
* instead.
*/
page_base = phys_addr & PAGE_MASK;
size = PAGE_ALIGN(phys_addr + size) - page_base;
if (efi_mem_attribute(page_base, size) & EFI_MEMORY_WB) {
prot = PAGE_KERNEL;
/*
* Mappings have to be page-aligned
*/
offset = phys_addr & ~PAGE_MASK;
phys_addr &= PAGE_MASK;
/*
* Ok, go for it..
*/
area = get_vm_area(size, VM_IOREMAP);
if (!area)
return NULL;
area->phys_addr = phys_addr;
addr = (void __iomem *) area->addr;
if (ioremap_page_range((unsigned long) addr,
(unsigned long) addr + size, phys_addr, prot)) {
vunmap((void __force *) addr);
return NULL;
}
return (void __iomem *) (offset + (char __iomem *)addr);
}
return __ioremap_uc(phys_addr);
}
EXPORT_SYMBOL(ioremap);
void __iomem *
ioremap_nocache (unsigned long phys_addr, unsigned long size)
{
if (kern_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
return NULL;
return __ioremap_uc(phys_addr);
}
EXPORT_SYMBOL(ioremap_nocache);
void
early_iounmap (volatile void __iomem *addr, unsigned long size)
{
}
void
iounmap (volatile void __iomem *addr)
{
if (REGION_NUMBER(addr) == RGN_GATE)
vunmap((void *) ((unsigned long) addr & PAGE_MASK));
}
EXPORT_SYMBOL(iounmap);
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