/*
* arch/parisc/mm/ioremap.c
*
- * 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 2001 Helge Deller <deller@gmx.de>
+ * (C) Copyright 2001-2006 Helge Deller <deller@gmx.de>
+ * (C) Copyright 2005 Kyle McMartin <kyle@parisc-linux.org>
*/
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
-static inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
- unsigned long phys_addr, unsigned long flags)
+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 end, pfn;
+ pgprot_t pgprot = __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY |
+ _PAGE_ACCESSED | flags);
address &= ~PMD_MASK;
+
end = address + size;
if (end > PMD_SIZE)
end = PMD_SIZE;
- if (address >= end)
- BUG();
+
+ BUG_ON(address >= end);
+
+ pfn = phys_addr >> PAGE_SHIFT;
do {
- if (!pte_none(*pte)) {
- printk(KERN_ERR "remap_area_pte: page already exists\n");
- BUG();
- }
- set_pte(pte, mk_pte_phys(phys_addr, __pgprot(_PAGE_PRESENT | _PAGE_RW |
- _PAGE_DIRTY | _PAGE_ACCESSED | flags)));
+ BUG_ON(!pte_none(*pte));
+
+ set_pte(pte, pfn_pte(pfn, pgprot));
+
address += PAGE_SIZE;
- phys_addr += 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)
+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;
+
+ BUG_ON(address >= end);
+
phys_addr -= address;
- if (address >= end)
- BUG();
do {
- pte_t * pte = pte_alloc_kernel(NULL, pmd, address);
+ pte_t *pte = pte_alloc_kernel(pmd, address);
if (!pte)
return -ENOMEM;
- remap_area_pte(pte, address, end - address, address + phys_addr, flags);
+
+ remap_area_pte(pte, address, end - address,
+ address + phys_addr, flags);
+
address = (address + PMD_SIZE) & PMD_MASK;
pmd++;
} while (address && (address < end));
+
return 0;
}
-#if (USE_HPPA_IOREMAP)
-static int remap_area_pages(unsigned long address, unsigned long phys_addr,
- unsigned long size, unsigned long flags)
+static int
+remap_area_pages(unsigned long address, unsigned long phys_addr,
+ unsigned long size, unsigned long flags)
{
- int error;
- pgd_t * dir;
+ pgd_t *dir;
+ int error = 0;
unsigned long end = address + size;
+ BUG_ON(address >= end);
+
phys_addr -= address;
- dir = pgd_offset(&init_mm, address);
+ dir = pgd_offset_k(address);
+
flush_cache_all();
- if (address >= end)
- BUG();
- spin_lock(&init_mm.page_table_lock);
+
do {
+ pud_t *pud;
pmd_t *pmd;
- pmd = pmd_alloc(dir, address);
+
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))
+ phys_addr + address, flags))
break;
+
error = 0;
address = (address + PGDIR_SIZE) & PGDIR_MASK;
dir++;
} while (address && (address < end));
- spin_unlock(&init_mm.page_table_lock);
- flush_tlb_all();
- return error;
-}
-#endif /* USE_HPPA_IOREMAP */
-#ifdef CONFIG_DEBUG_IOREMAP
-static unsigned long last = 0;
+ flush_tlb_all();
-void gsc_bad_addr(unsigned long addr)
-{
- if (time_after(jiffies, last + HZ*10)) {
- printk("gsc_foo() called with bad address 0x%lx\n", addr);
- dump_stack();
- last = jiffies;
- }
+ return error;
}
-EXPORT_SYMBOL(gsc_bad_addr);
-
-void __raw_bad_addr(const volatile void __iomem *addr)
-{
- if (time_after(jiffies, last + HZ*10)) {
- printk("__raw_foo() called with bad address 0x%p\n", addr);
- dump_stack();
- last = jiffies;
- }
-}
-EXPORT_SYMBOL(__raw_bad_addr);
-#endif
/*
* Generic mapping function (not visible outside):
/*
* Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
+ * address space.
*
* NOTE! We need to allow non-page-aligned mappings too: we will obviously
* have to convert them into an offset in a page-aligned mapping, but the
*/
void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
{
-#if !(USE_HPPA_IOREMAP)
+ void *addr;
+ struct vm_struct *area;
+ unsigned long offset, last_addr;
+#ifdef CONFIG_EISA
unsigned long end = phys_addr + size - 1;
/* Support EISA addresses */
- if ((phys_addr >= 0x00080000 && end < 0x000fffff)
- || (phys_addr >= 0x00500000 && end < 0x03bfffff)) {
- phys_addr |= 0xfc000000;
+ if ((phys_addr >= 0x00080000 && end < 0x000fffff) ||
+ (phys_addr >= 0x00500000 && end < 0x03bfffff)) {
+ phys_addr |= F_EXTEND(0xfc000000);
+ flags |= _PAGE_NO_CACHE;
}
-
-#ifdef CONFIG_DEBUG_IOREMAP
- return (void __iomem *)(phys_addr - (0x1UL << NYBBLE_SHIFT));
-#else
- return (void __iomem *)phys_addr;
#endif
-#else
- void * addr;
- struct vm_struct * area;
- unsigned long offset, last_addr;
-
/* Don't allow wraparound or zero size */
last_addr = phys_addr + size - 1;
if (!size || last_addr < phys_addr)
t_addr = __va(phys_addr);
t_end = t_addr + (size - 1);
- for(page = virt_to_page(t_addr); page <= virt_to_page(t_end); page++)
+ for (page = virt_to_page(t_addr);
+ page <= virt_to_page(t_end); page++) {
if(!PageReserved(page))
return NULL;
+ }
}
/*
area = get_vm_area(size, VM_IOREMAP);
if (!area)
return NULL;
+
addr = area->addr;
if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
vfree(addr);
return NULL;
}
+
return (void __iomem *) (offset + (char *)addr);
-#endif
}
+EXPORT_SYMBOL(__ioremap);
void iounmap(void __iomem *addr)
{
-#if !(USE_HPPA_IOREMAP)
- return;
-#else
if (addr > high_memory)
return vfree((void *) (PAGE_MASK & (unsigned long __force) addr));
-#endif
}
+EXPORT_SYMBOL(iounmap);
git://git.onelab.eu / linux-2.6.git / blobdiff