/*
* arch/sh/mm/ioremap.c
*
+ * (C) Copyright 1995 1996 Linus Torvalds
+ * (C) Copyright 2005 - 2010 Paul Mundt
+ *
* Re-map IO memory to kernel address space so that we can access it.
* This is needed for high PCI addresses that aren't mapped in the
* 640k-1MB IO memory area on PC's
*
- * (C) Copyright 1995 1996 Linus Torvalds
- * (C) Copyright 2005, 2006 Paul Mundt
- *
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
*/
#include <linux/vmalloc.h>
#include <linux/module.h>
+#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pci.h>
-#include <asm/io.h>
+#include <linux/io.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/addrspace.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
-
-static inline void remap_area_pte(pte_t * pte, unsigned long address,
- unsigned long size, unsigned long phys_addr, unsigned long flags)
-{
- unsigned long end;
- unsigned long pfn;
- pgprot_t pgprot = __pgprot(pgprot_val(PAGE_KERNEL_NOCACHE) | flags);
-
- address &= ~PMD_MASK;
- end = address + size;
- if (end > PMD_SIZE)
- end = PMD_SIZE;
- if (address >= end)
- BUG();
- pfn = phys_addr >> PAGE_SHIFT;
- do {
- if (!pte_none(*pte)) {
- printk("remap_area_pte: page already exists\n");
- BUG();
- }
- set_pte(pte, pfn_pte(pfn, pgprot));
- address += PAGE_SIZE;
- pfn++;
- pte++;
- } while (address && (address < end));
-}
-
-static inline int remap_area_pmd(pmd_t * pmd, unsigned long address,
- unsigned long size, unsigned long phys_addr, unsigned long flags)
-{
- unsigned long end;
-
- address &= ~PGDIR_MASK;
- end = address + size;
- if (end > PGDIR_SIZE)
- end = PGDIR_SIZE;
- phys_addr -= address;
- if (address >= end)
- BUG();
- do {
- pte_t * pte = pte_alloc_kernel(pmd, address);
- if (!pte)
- return -ENOMEM;
- remap_area_pte(pte, address, end - address, address + phys_addr, flags);
- address = (address + PMD_SIZE) & PMD_MASK;
- pmd++;
- } while (address && (address < end));
- return 0;
-}
-
-int remap_area_pages(unsigned long address, unsigned long phys_addr,
- unsigned long size, unsigned long flags)
-{
- int error;
- pgd_t * dir;
- unsigned long end = address + size;
-
- phys_addr -= address;
- dir = pgd_offset_k(address);
- flush_cache_all();
- if (address >= end)
- BUG();
- do {
- pud_t *pud;
- pmd_t *pmd;
-
- error = -ENOMEM;
-
- pud = pud_alloc(&init_mm, dir, address);
- if (!pud)
- break;
- pmd = pmd_alloc(&init_mm, pud, address);
- if (!pmd)
- break;
- if (remap_area_pmd(pmd, address, end - address,
- phys_addr + address, flags))
- break;
- error = 0;
- address = (address + PGDIR_SIZE) & PGDIR_MASK;
- dir++;
- } while (address && (address < end));
- flush_tlb_all();
- return error;
-}
+#include <asm/mmu.h>
/*
* Remap an arbitrary physical address space into the kernel virtual
* have to convert them into an offset in a page-aligned mapping, but the
* caller shouldn't need to know that small detail.
*/
-void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
- unsigned long flags)
+void __iomem * __init_refok
+__ioremap_caller(phys_addr_t phys_addr, unsigned long size,
+ pgprot_t pgprot, void *caller)
{
- struct vm_struct * area;
+ struct vm_struct *area;
unsigned long offset, last_addr, addr, orig_addr;
+ void __iomem *mapped;
/* Don't allow wraparound or zero size */
last_addr = phys_addr + size - 1;
return NULL;
/*
- * Don't remap the low PCI/ISA area, it's always mapped..
- */
- if (phys_addr >= 0xA0000 && last_addr < 0x100000)
- return (void __iomem *)phys_to_virt(phys_addr);
-
- /*
- * If we're on an SH7751 or SH7780 PCI controller, PCI memory is
- * mapped at the end of the address space (typically 0xfd000000)
- * in a non-translatable area, so mapping through page tables for
- * this area is not only pointless, but also fundamentally
- * broken. Just return the physical address instead.
- *
- * For boards that map a small PCI memory aperture somewhere in
- * P1/P2 space, ioremap() will already do the right thing,
- * and we'll never get this far.
+ * If we can't yet use the regular approach, go the fixmap route.
*/
- if (is_pci_memaddr(phys_addr) && is_pci_memaddr(last_addr))
- return (void __iomem *)phys_addr;
+ if (!mem_init_done)
+ return ioremap_fixed(phys_addr, size, pgprot);
/*
- * Don't allow anybody to remap normal RAM that we're using..
+ * First try to remap through the PMB.
+ * PMB entries are all pre-faulted.
*/
- if (phys_addr < virt_to_phys(high_memory))
- return NULL;
+ mapped = pmb_remap_caller(phys_addr, size, pgprot, caller);
+ if (mapped && !IS_ERR(mapped))
+ return mapped;
/*
* Mappings have to be page-aligned
/*
* Ok, go for it..
*/
- area = get_vm_area(size, VM_IOREMAP);
+ area = get_vm_area_caller(size, VM_IOREMAP, caller);
if (!area)
return NULL;
area->phys_addr = phys_addr;
orig_addr = addr = (unsigned long)area->addr;
-#ifdef CONFIG_32BIT
+ if (ioremap_page_range(addr, addr + size, phys_addr, pgprot)) {
+ vunmap((void *)orig_addr);
+ return NULL;
+ }
+
+ return (void __iomem *)(offset + (char *)orig_addr);
+}
+EXPORT_SYMBOL(__ioremap_caller);
+
+/*
+ * Simple checks for non-translatable mappings.
+ */
+static inline int iomapping_nontranslatable(unsigned long offset)
+{
+#ifdef CONFIG_29BIT
/*
- * First try to remap through the PMB once a valid VMA has been
- * established. Smaller allocations (or the rest of the size
- * remaining after a PMB mapping due to the size not being
- * perfectly aligned on a PMB size boundary) are then mapped
- * through the UTLB using conventional page tables.
- *
- * PMB entries are all pre-faulted.
+ * In 29-bit mode this includes the fixed P1/P2 areas, as well as
+ * parts of P3.
*/
- if (unlikely(size >= 0x1000000)) {
- unsigned long mapped = pmb_remap(addr, phys_addr, size, flags);
-
- if (likely(mapped)) {
- addr += mapped;
- phys_addr += mapped;
- size -= mapped;
- }
- }
+ if (PXSEG(offset) < P3SEG || offset >= P3_ADDR_MAX)
+ return 1;
#endif
- if (likely(size))
- if (remap_area_pages(addr, phys_addr, size, flags)) {
- vunmap((void *)orig_addr);
- return NULL;
- }
-
- return (void __iomem *)(offset + (char *)orig_addr);
+ return 0;
}
-EXPORT_SYMBOL(__ioremap);
void __iounmap(void __iomem *addr)
{
unsigned long vaddr = (unsigned long __force)addr;
struct vm_struct *p;
- if (PXSEG(vaddr) < P3SEG || is_pci_memaddr(vaddr))
+ /*
+ * Nothing to do if there is no translatable mapping.
+ */
+ if (iomapping_nontranslatable(vaddr))
return;
-#ifdef CONFIG_32BIT
/*
- * Purge any PMB entries that may have been established for this
- * mapping, then proceed with conventional VMA teardown.
- *
- * XXX: Note that due to the way that remove_vm_area() does
- * matching of the resultant VMA, we aren't able to fast-forward
- * the address past the PMB space until the end of the VMA where
- * the page tables reside. As such, unmap_vm_area() will be
- * forced to linearly scan over the area until it finds the page
- * tables where PTEs that need to be unmapped actually reside,
- * which is far from optimal. Perhaps we need to use a separate
- * VMA for the PMB mappings?
- * -- PFM.
+ * There's no VMA if it's from an early fixed mapping.
*/
- pmb_unmap(vaddr);
-#endif
+ if (iounmap_fixed(addr) == 0)
+ return;
+
+ /*
+ * If the PMB handled it, there's nothing else to do.
+ */
+ if (pmb_unmap(addr) == 0)
+ return;
p = remove_vm_area((void *)(vaddr & PAGE_MASK));
if (!p) {
- printk(KERN_ERR "%s: bad address %p\n", __FUNCTION__, addr);
+ printk(KERN_ERR "%s: bad address %p\n", __func__, addr);
return;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff