1 /*
2 * arch/arm/mach-tegra/io.c
3 *
4 * Copyright (C) 2010 Google, Inc.
5 *
6 * Author:
7 * Colin Cross <ccross@google.com>
8 * Erik Gilling <konkers@google.com>
9 *
10 * This software is licensed under the terms of the GNU General Public
11 * License version 2, as published by the Free Software Foundation, and
12 * may be copied, distributed, and modified under those terms.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 */
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/mm.h>
25 #include <linux/io.h>
26
27 #include <mach/hardware.h>
28 #include <asm/page.h>
29 #include <asm/mach/map.h>
30
31 #include "board.h"
32
33 static struct map_desc tegra_io_desc[] __initdata = {
34 {
35 .virtual = IO_PPSB_VIRT,
36 .pfn = __phys_to_pfn(IO_PPSB_PHYS),
37 .length = IO_PPSB_SIZE,
38 .type = MT_DEVICE,
39 },
40 {
41 .virtual = IO_APB_VIRT,
42 .pfn = __phys_to_pfn(IO_APB_PHYS),
43 .length = IO_APB_SIZE,
44 .type = MT_DEVICE,
45 },
46 {
47 .virtual = IO_CPU_VIRT,
48 .pfn = __phys_to_pfn(IO_CPU_PHYS),
49 .length = IO_CPU_SIZE,
50 .type = MT_DEVICE,
51 },
52 {
53 .virtual = IO_IRAM_VIRT,
54 .pfn = __phys_to_pfn(IO_IRAM_PHYS),
55 .length = IO_IRAM_SIZE,
56 .type = MT_DEVICE,
57 },
58 };
59
tegra_map_common_io(void)60 void __init tegra_map_common_io(void)
61 {
62 iotable_init(tegra_io_desc, ARRAY_SIZE(tegra_io_desc));
63 }
64
65 /*
66 * Intercept ioremap() requests for addresses in our fixed mapping regions.
67 */
tegra_ioremap(unsigned long p,size_t size,unsigned int type)68 void __iomem *tegra_ioremap(unsigned long p, size_t size, unsigned int type)
69 {
70 void __iomem *v = IO_ADDRESS(p);
71 if (v == NULL)
72 v = __arm_ioremap(p, size, type);
73 return v;
74 }
75 EXPORT_SYMBOL(tegra_ioremap);
76
tegra_iounmap(volatile void __iomem * addr)77 void tegra_iounmap(volatile void __iomem *addr)
78 {
79 unsigned long virt = (unsigned long)addr;
80
81 if (virt >= VMALLOC_START && virt < VMALLOC_END)
82 __iounmap(addr);
83 }
84 EXPORT_SYMBOL(tegra_iounmap);
85