12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091 |
- /*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
- #include <linux/vmalloc.h>
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/io.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #include <linux/cache.h>
- void __iomem *ioremap(unsigned long paddr, unsigned long size)
- {
- unsigned long end;
- /* Don't allow wraparound or zero size */
- end = paddr + size - 1;
- if (!size || (end < paddr))
- return NULL;
- /* If the region is h/w uncached, avoid MMU mappings */
- if (paddr >= ARC_UNCACHED_ADDR_SPACE)
- return (void __iomem *)paddr;
- return ioremap_prot(paddr, size, PAGE_KERNEL_NO_CACHE);
- }
- EXPORT_SYMBOL(ioremap);
- /*
- * ioremap with access flags
- * Cache semantics wise it is same as ioremap - "forced" uncached.
- * However unline vanilla ioremap which bypasses ARC MMU for addresses in
- * ARC hardware uncached region, this one still goes thru the MMU as caller
- * might need finer access control (R/W/X)
- */
- void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
- unsigned long flags)
- {
- void __iomem *vaddr;
- struct vm_struct *area;
- unsigned long off, end;
- pgprot_t prot = __pgprot(flags);
- /* Don't allow wraparound, zero size */
- end = paddr + size - 1;
- if ((!size) || (end < paddr))
- return NULL;
- /* An early platform driver might end up here */
- if (!slab_is_available())
- return NULL;
- /* force uncached */
- prot = pgprot_noncached(prot);
- /* Mappings have to be page-aligned */
- off = paddr & ~PAGE_MASK;
- paddr &= PAGE_MASK;
- size = PAGE_ALIGN(end + 1) - paddr;
- /*
- * Ok, go for it..
- */
- area = get_vm_area(size, VM_IOREMAP);
- if (!area)
- return NULL;
- area->phys_addr = paddr;
- vaddr = (void __iomem *)area->addr;
- if (ioremap_page_range((unsigned long)vaddr,
- (unsigned long)vaddr + size, paddr, prot)) {
- vunmap((void __force *)vaddr);
- return NULL;
- }
- return (void __iomem *)(off + (char __iomem *)vaddr);
- }
- EXPORT_SYMBOL(ioremap_prot);
- void iounmap(const void __iomem *addr)
- {
- if (addr >= (void __force __iomem *)ARC_UNCACHED_ADDR_SPACE)
- return;
- vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
- }
- EXPORT_SYMBOL(iounmap);
|