1/*
2 * Copyright (C) 2009,  Netronome Systems, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to
6 * deal in the Software without restriction, including without limitation the
7 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
8 * sell copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 * DEALINGS IN THE SOFTWARE.
21 */
22
23
24#include <mini-os/types.h>
25#include <mini-os/lib.h>
26#include <mini-os/mm.h>
27#include <mini-os/ioremap.h>
28
29/* Map a physical address range into virtual address space with provided
30 * flags. Return a virtual address range it is mapped to. */
31static void *__do_ioremap(unsigned long phys_addr, unsigned long size,
32                          unsigned long prot)
33{
34    unsigned long va;
35    unsigned long mfns, mfn;
36    unsigned long num_pages, offset;
37    int i;
38
39    /* allow non page aligned addresses but for mapping we need to align them */
40    offset = (phys_addr & ~PAGE_MASK);
41    num_pages = (offset + size + PAGE_SIZE - 1) / PAGE_SIZE;
42    phys_addr &= PAGE_MASK;
43    mfns = mfn = phys_addr >> PAGE_SHIFT;
44
45    /* sanity checks on list of MFNs */
46    for ( i = 0; i < num_pages; i++, mfn++ )
47    {
48        if ( mfn_is_ram(mfn) )
49        {
50            minios_printk("ioremap: mfn 0x%ulx is RAM\n", mfn);
51            goto mfn_invalid;
52        }
53    }
54    va = (unsigned long)minios_map_frames_ex(&mfns, num_pages, 0, 1, 1,
55                                             DOMID_IO, NULL, prot);
56    return (void *)(va + offset);
57
58mfn_invalid:
59    return NULL;
60}
61
62void *minios_ioremap(unsigned long phys_addr, unsigned long size)
63{
64    return __do_ioremap(phys_addr, size, IO_PROT);
65}
66
67void *minios_ioremap_nocache(unsigned long phys_addr, unsigned long size)
68{
69    return __do_ioremap(phys_addr, size, IO_PROT_NOCACHE);
70}
71
72/* Un-map the io-remapped region. Currently no list of existing mappings is
73 * maintained, so the caller has to supply the size */
74void minios_iounmap(void *virt_addr, unsigned long size)
75{
76    unsigned long num_pages;
77    unsigned long va = (unsigned long)virt_addr;
78
79    /* work out number of frames to unmap */
80    num_pages = ((va & ~PAGE_MASK) + size + PAGE_SIZE - 1) / PAGE_SIZE;
81
82    unmap_frames(va & PAGE_MASK, num_pages);
83}
84
85
86
87/* -*-  Mode:C; c-basic-offset:4; tab-width:4 indent-tabs-mode:nil -*- */
88