mirror of https://gitee.com/openkylin/linux.git
341 lines
8.0 KiB
C
341 lines
8.0 KiB
C
/*
|
|
* This file contains ioremap and related functions for 64-bit machines.
|
|
*
|
|
* Derived from arch/ppc64/mm/init.c
|
|
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
|
|
*
|
|
* Modifications by Paul Mackerras (PowerMac) (paulus@samba.org)
|
|
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
|
|
* Copyright (C) 1996 Paul Mackerras
|
|
* Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
|
|
*
|
|
* Derived from "arch/i386/mm/init.c"
|
|
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
|
|
*
|
|
* Dave Engebretsen <engebret@us.ibm.com>
|
|
* Rework for PPC64 port.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/page.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/lmb.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/io.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/eeh.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/mmzone.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/system.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/abs_addr.h>
|
|
#include <asm/vdso.h>
|
|
#include <asm/firmware.h>
|
|
|
|
#include "mmu_decl.h"
|
|
|
|
unsigned long ioremap_bot = IMALLOC_BASE;
|
|
static unsigned long phbs_io_bot = PHBS_IO_BASE;
|
|
|
|
/*
|
|
* map_io_page currently only called by __ioremap
|
|
* map_io_page adds an entry to the ioremap page table
|
|
* and adds an entry to the HPT, possibly bolting it
|
|
*/
|
|
static int map_io_page(unsigned long ea, unsigned long pa, int flags)
|
|
{
|
|
pgd_t *pgdp;
|
|
pud_t *pudp;
|
|
pmd_t *pmdp;
|
|
pte_t *ptep;
|
|
|
|
if (mem_init_done) {
|
|
pgdp = pgd_offset_k(ea);
|
|
pudp = pud_alloc(&init_mm, pgdp, ea);
|
|
if (!pudp)
|
|
return -ENOMEM;
|
|
pmdp = pmd_alloc(&init_mm, pudp, ea);
|
|
if (!pmdp)
|
|
return -ENOMEM;
|
|
ptep = pte_alloc_kernel(pmdp, ea);
|
|
if (!ptep)
|
|
return -ENOMEM;
|
|
set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
|
|
__pgprot(flags)));
|
|
} else {
|
|
/*
|
|
* If the mm subsystem is not fully up, we cannot create a
|
|
* linux page table entry for this mapping. Simply bolt an
|
|
* entry in the hardware page table.
|
|
*
|
|
*/
|
|
if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags,
|
|
mmu_io_psize)) {
|
|
printk(KERN_ERR "Failed to do bolted mapping IO "
|
|
"memory at %016lx !\n", pa);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void __iomem * __ioremap_com(phys_addr_t addr, unsigned long pa,
|
|
unsigned long ea, unsigned long size,
|
|
unsigned long flags)
|
|
{
|
|
unsigned long i;
|
|
|
|
if ((flags & _PAGE_PRESENT) == 0)
|
|
flags |= pgprot_val(PAGE_KERNEL);
|
|
|
|
for (i = 0; i < size; i += PAGE_SIZE)
|
|
if (map_io_page(ea+i, pa+i, flags))
|
|
return NULL;
|
|
|
|
return (void __iomem *) (ea + (addr & ~PAGE_MASK));
|
|
}
|
|
|
|
void __iomem * __ioremap(phys_addr_t addr, unsigned long size,
|
|
unsigned long flags)
|
|
{
|
|
unsigned long pa, ea;
|
|
void __iomem *ret;
|
|
|
|
/*
|
|
* Choose an address to map it to.
|
|
* Once the imalloc system is running, we use it.
|
|
* Before that, we map using addresses going
|
|
* up from ioremap_bot. imalloc will use
|
|
* the addresses from ioremap_bot through
|
|
* IMALLOC_END
|
|
*
|
|
*/
|
|
pa = addr & PAGE_MASK;
|
|
size = PAGE_ALIGN(addr + size) - pa;
|
|
|
|
if ((size == 0) || (pa == 0))
|
|
return NULL;
|
|
|
|
if (mem_init_done) {
|
|
struct vm_struct *area;
|
|
area = im_get_free_area(size);
|
|
if (area == NULL)
|
|
return NULL;
|
|
ea = (unsigned long)(area->addr);
|
|
ret = __ioremap_com(addr, pa, ea, size, flags);
|
|
if (!ret)
|
|
im_free(area->addr);
|
|
} else {
|
|
ea = ioremap_bot;
|
|
ret = __ioremap_com(addr, pa, ea, size, flags);
|
|
if (ret)
|
|
ioremap_bot += size;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
void __iomem * ioremap(phys_addr_t addr, unsigned long size)
|
|
{
|
|
unsigned long flags = _PAGE_NO_CACHE | _PAGE_GUARDED;
|
|
|
|
if (ppc_md.ioremap)
|
|
return ppc_md.ioremap(addr, size, flags);
|
|
return __ioremap(addr, size, flags);
|
|
}
|
|
|
|
void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size,
|
|
unsigned long flags)
|
|
{
|
|
if (ppc_md.ioremap)
|
|
return ppc_md.ioremap(addr, size, flags);
|
|
return __ioremap(addr, size, flags);
|
|
}
|
|
|
|
|
|
#define IS_PAGE_ALIGNED(_val) ((_val) == ((_val) & PAGE_MASK))
|
|
|
|
int __ioremap_explicit(phys_addr_t pa, unsigned long ea,
|
|
unsigned long size, unsigned long flags)
|
|
{
|
|
struct vm_struct *area;
|
|
void __iomem *ret;
|
|
|
|
/* For now, require page-aligned values for pa, ea, and size */
|
|
if (!IS_PAGE_ALIGNED(pa) || !IS_PAGE_ALIGNED(ea) ||
|
|
!IS_PAGE_ALIGNED(size)) {
|
|
printk(KERN_ERR "unaligned value in %s\n", __FUNCTION__);
|
|
return 1;
|
|
}
|
|
|
|
if (!mem_init_done) {
|
|
/* Two things to consider in this case:
|
|
* 1) No records will be kept (imalloc, etc) that the region
|
|
* has been remapped
|
|
* 2) It won't be easy to iounmap() the region later (because
|
|
* of 1)
|
|
*/
|
|
;
|
|
} else {
|
|
area = im_get_area(ea, size,
|
|
IM_REGION_UNUSED|IM_REGION_SUBSET|IM_REGION_EXISTS);
|
|
if (area == NULL) {
|
|
/* Expected when PHB-dlpar is in play */
|
|
return 1;
|
|
}
|
|
if (ea != (unsigned long) area->addr) {
|
|
printk(KERN_ERR "unexpected addr return from "
|
|
"im_get_area\n");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
ret = __ioremap_com(pa, pa, ea, size, flags);
|
|
if (ret == NULL) {
|
|
printk(KERN_ERR "ioremap_explicit() allocation failure !\n");
|
|
return 1;
|
|
}
|
|
if (ret != (void *) ea) {
|
|
printk(KERN_ERR "__ioremap_com() returned unexpected addr\n");
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Unmap an IO region and remove it from imalloc'd list.
|
|
* Access to IO memory should be serialized by driver.
|
|
* This code is modeled after vmalloc code - unmap_vm_area()
|
|
*
|
|
* XXX what about calls before mem_init_done (ie python_countermeasures())
|
|
*/
|
|
void __iounmap(volatile void __iomem *token)
|
|
{
|
|
void *addr;
|
|
|
|
if (!mem_init_done)
|
|
return;
|
|
|
|
addr = (void *) ((unsigned long __force) token & PAGE_MASK);
|
|
|
|
im_free(addr);
|
|
}
|
|
|
|
void iounmap(volatile void __iomem *token)
|
|
{
|
|
if (ppc_md.iounmap)
|
|
ppc_md.iounmap(token);
|
|
else
|
|
__iounmap(token);
|
|
}
|
|
|
|
static int iounmap_subset_regions(unsigned long addr, unsigned long size)
|
|
{
|
|
struct vm_struct *area;
|
|
|
|
/* Check whether subsets of this region exist */
|
|
area = im_get_area(addr, size, IM_REGION_SUPERSET);
|
|
if (area == NULL)
|
|
return 1;
|
|
|
|
while (area) {
|
|
iounmap((void __iomem *) area->addr);
|
|
area = im_get_area(addr, size,
|
|
IM_REGION_SUPERSET);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __iounmap_explicit(volatile void __iomem *start, unsigned long size)
|
|
{
|
|
struct vm_struct *area;
|
|
unsigned long addr;
|
|
int rc;
|
|
|
|
addr = (unsigned long __force) start & PAGE_MASK;
|
|
|
|
/* Verify that the region either exists or is a subset of an existing
|
|
* region. In the latter case, split the parent region to create
|
|
* the exact region
|
|
*/
|
|
area = im_get_area(addr, size,
|
|
IM_REGION_EXISTS | IM_REGION_SUBSET);
|
|
if (area == NULL) {
|
|
/* Determine whether subset regions exist. If so, unmap */
|
|
rc = iounmap_subset_regions(addr, size);
|
|
if (rc) {
|
|
printk(KERN_ERR
|
|
"%s() cannot unmap nonexistent range 0x%lx\n",
|
|
__FUNCTION__, addr);
|
|
return 1;
|
|
}
|
|
} else {
|
|
iounmap((void __iomem *) area->addr);
|
|
}
|
|
/*
|
|
* FIXME! This can't be right:
|
|
iounmap(area->addr);
|
|
* Maybe it should be "iounmap(area);"
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ioremap);
|
|
EXPORT_SYMBOL(ioremap_flags);
|
|
EXPORT_SYMBOL(__ioremap);
|
|
EXPORT_SYMBOL(iounmap);
|
|
EXPORT_SYMBOL(__iounmap);
|
|
|
|
static DEFINE_SPINLOCK(phb_io_lock);
|
|
|
|
void __iomem * reserve_phb_iospace(unsigned long size)
|
|
{
|
|
void __iomem *virt_addr;
|
|
|
|
if (phbs_io_bot >= IMALLOC_BASE)
|
|
panic("reserve_phb_iospace(): phb io space overflow\n");
|
|
|
|
spin_lock(&phb_io_lock);
|
|
virt_addr = (void __iomem *) phbs_io_bot;
|
|
phbs_io_bot += size;
|
|
spin_unlock(&phb_io_lock);
|
|
|
|
return virt_addr;
|
|
}
|