1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/mach-omap1/io.c
4 *
5 * OMAP1 I/O mapping code
6 */
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/io.h>
12#include <linux/omap-dma.h>
13
14#include <asm/tlb.h>
15#include <asm/mach/map.h>
16
17#include "tc.h"
18#include "iomap.h"
19#include "common.h"
20
21/*
22 * The machine specific code may provide the extra mapping besides the
23 * default mapping provided here.
24 */
25static struct map_desc omap1_io_desc[] __initdata = {
26 {
27 .virtual = OMAP1_IO_VIRT,
28 .pfn = __phys_to_pfn(OMAP1_IO_PHYS),
29 .length = OMAP1_IO_SIZE,
30 .type = MT_DEVICE
31 }, {
32 .virtual = OMAP1_DSP_BASE,
33 .pfn = __phys_to_pfn(OMAP1_DSP_START),
34 .length = OMAP1_DSP_SIZE,
35 .type = MT_DEVICE
36 }, {
37 .virtual = OMAP1_DSPREG_BASE,
38 .pfn = __phys_to_pfn(OMAP1_DSPREG_START),
39 .length = OMAP1_DSPREG_SIZE,
40 .type = MT_DEVICE
41 }
42};
43
44/*
45 * Maps common IO regions for omap1
46 */
47void __init omap1_map_io(void)
48{
49 iotable_init(omap1_io_desc, ARRAY_SIZE(omap1_io_desc));
50}
51
52/*
53 * Common low-level hardware init for omap1.
54 */
55void __init omap1_init_early(void)
56{
57 omap_check_revision();
58
59 /* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
60 * on a Posted Write in the TIPB Bridge".
61 */
62 omap_writew(v: 0x0, MPU_PUBLIC_TIPB_CNTL);
63 omap_writew(v: 0x0, MPU_PRIVATE_TIPB_CNTL);
64}
65
66void __init omap1_init_late(void)
67{
68 omap_serial_wakeup_init();
69}
70
71/*
72 * NOTE: Please use ioremap + __raw_read/write where possible instead of these
73 */
74
75u8 omap_readb(u32 pa)
76{
77 return __raw_readb(OMAP1_IO_ADDRESS(pa));
78}
79EXPORT_SYMBOL(omap_readb);
80
81u16 omap_readw(u32 pa)
82{
83 return __raw_readw(OMAP1_IO_ADDRESS(pa));
84}
85EXPORT_SYMBOL(omap_readw);
86
87u32 omap_readl(u32 pa)
88{
89 return __raw_readl(OMAP1_IO_ADDRESS(pa));
90}
91EXPORT_SYMBOL(omap_readl);
92
93void omap_writeb(u8 v, u32 pa)
94{
95 __raw_writeb(val: v, OMAP1_IO_ADDRESS(pa));
96}
97EXPORT_SYMBOL(omap_writeb);
98
99void omap_writew(u16 v, u32 pa)
100{
101 __raw_writew(val: v, OMAP1_IO_ADDRESS(pa));
102}
103EXPORT_SYMBOL(omap_writew);
104
105void omap_writel(u32 v, u32 pa)
106{
107 __raw_writel(val: v, OMAP1_IO_ADDRESS(pa));
108}
109EXPORT_SYMBOL(omap_writel);
110

source code of linux/arch/arm/mach-omap1/io.c