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