xref: /kernel/linux/linux-6.6/arch/arm/mach-omap1/io.c (revision 62306a36) 
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(0x0, MPU_PUBLIC_TIPB_CNTL);
63	omap_writew(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(v, OMAP1_IO_ADDRESS(pa));
96}
97EXPORT_SYMBOL(omap_writeb);
98
99void omap_writew(u16 v, u32 pa)
100{
101	__raw_writew(v, OMAP1_IO_ADDRESS(pa));
102}
103EXPORT_SYMBOL(omap_writew);
104
105void omap_writel(u32 v, u32 pa)
106{
107	__raw_writel(v, OMAP1_IO_ADDRESS(pa));
108}
109EXPORT_SYMBOL(omap_writel);
110