arch/hexagon/mm/ioremap.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * I/O remap functions for Hexagon
   4  *
   5  * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
   6  */
   7
   8 #include <linux/io.h>
   9 #include <linux/vmalloc.h>
  10 #include <linux/mm.h>
  11
  12 void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
  13 {
  14         unsigned long last_addr, addr;
  15         unsigned long offset = phys_addr & ~PAGE_MASK;
  16         struct vm_struct *area;
  17
  18         pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
  19                                         |(__HEXAGON_C_DEV << 6));
  20
  21         last_addr = phys_addr + size - 1;
  22
  23         /*  Wrapping not allowed  */
  24         if (!size || (last_addr < phys_addr))
  25                 return NULL;
  26
  27         /*  Rounds up to next page size, including whole-page offset */
  28         size = PAGE_ALIGN(offset + size);
  29
  30         area = get_vm_area(size, VM_IOREMAP);
  31         addr = (unsigned long)area->addr;
  32
  33         if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
  34                 vunmap((void *)addr);
  35                 return NULL;
  36         }
  37
  38         return (void __iomem *) (offset + addr);
  39 }
  40
  41 void iounmap(const volatile void __iomem *addr)
  42 {
  43         vunmap((void *) ((unsigned long) addr & PAGE_MASK));
  44 }