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-rw-r--r--arch/sh/mm/ioremap.c186
1 files changed, 81 insertions, 105 deletions
diff --git a/arch/sh/mm/ioremap.c b/arch/sh/mm/ioremap.c
index e794e27a72f..0c99ec2e7ed 100644
--- a/arch/sh/mm/ioremap.c
+++ b/arch/sh/mm/ioremap.c
@@ -1,104 +1,29 @@
/*
* 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
+ * 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 <asm/io.h>
+#include <linux/pci.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(_PAGE_PRESENT | _PAGE_RW |
- _PAGE_DIRTY | _PAGE_ACCESSED |
- _PAGE_HW_SHARED | _PAGE_FLAGS_HARD | 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 {
- pmd_t *pmd;
- pmd = pmd_alloc(&init_mm, dir, address);
- error = -ENOMEM;
- 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;
-}
-
-/*
- * Generic mapping function (not visible outside):
- */
+#include <asm/mmu.h>
/*
* Remap an arbitrary physical address space into the kernel virtual
@@ -109,11 +34,13 @@ int remap_area_pages(unsigned long address, unsigned long phys_addr,
* have to convert them into an offset in a page-aligned mapping, but the
* caller shouldn't need to know that small detail.
*/
-void * p3_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)
{
- void * addr;
- struct vm_struct * area;
- unsigned long offset, last_addr;
+ 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;
@@ -121,16 +48,18 @@ void * p3_ioremap(unsigned long phys_addr, unsigned long size, unsigned long fla
return NULL;
/*
- * Don't remap the low PCI/ISA area, it's always mapped..
+ * If we can't yet use the regular approach, go the fixmap route.
*/
- if (phys_addr >= 0xA0000 && last_addr < 0x100000)
- return phys_to_virt(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
@@ -142,20 +71,67 @@ void * p3_ioremap(unsigned long phys_addr, unsigned long size, unsigned long fla
/*
* 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;
- addr = area->addr;
- if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
- vunmap(addr);
+ orig_addr = addr = (unsigned long)area->addr;
+
+ if (ioremap_page_range(addr, addr + size, phys_addr, pgprot)) {
+ vunmap((void *)orig_addr);
return NULL;
}
- return (void *) (offset + (char *)addr);
+
+ return (void __iomem *)(offset + (char *)orig_addr);
}
+EXPORT_SYMBOL(__ioremap_caller);
-void p3_iounmap(void *addr)
+/*
+ * Simple checks for non-translatable mappings.
+ */
+static inline int iomapping_nontranslatable(unsigned long offset)
+{
+#ifdef CONFIG_29BIT
+ /*
+ * In 29-bit mode this includes the fixed P1/P2 areas, as well as
+ * parts of P3.
+ */
+ if (PXSEG(offset) < P3SEG || offset >= P3_ADDR_MAX)
+ return 1;
+#endif
+
+ return 0;
+}
+
+void __iounmap(void __iomem *addr)
{
- if (addr > high_memory)
- vfree((void *)(PAGE_MASK & (unsigned long)addr));
+ unsigned long vaddr = (unsigned long __force)addr;
+ struct vm_struct *p;
+
+ /*
+ * Nothing to do if there is no translatable mapping.
+ */
+ if (iomapping_nontranslatable(vaddr))
+ return;
+
+ /*
+ * There's no VMA if it's from an early fixed mapping.
+ */
+ 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", __func__, addr);
+ return;
+ }
+
+ kfree(p);
}
+EXPORT_SYMBOL(__iounmap);
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