124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* (c) Copyright 2006, 2007 Hewlett-Packard Development Company, L.P.
|
|
* Bjorn Helgaas <bjorn.helgaas@hp.com>
|
|
*/
|
|
|
|
#include <linux/compiler.h>
|
|
#include <linux/module.h>
|
|
#include <linux/efi.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mm.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.rst.
|
|
*/
|
|
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_uc(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_uc);
|
|
|
|
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);
|