LXR linux/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
  12void __iomem *ioremap_nocache(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
  41void __iounmap(const volatile void __iomem *addr)
  42{
  43        vunmap((void *) ((unsigned long) addr & PAGE_MASK));
  44}
  45