blob: fa0b3273a8a9c5d389bf86df4c6040a28793c03c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/*
* Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* This library provides CMOS (inside RTC SRAM) access routines at a very
* early stage when driver model is not available yet. Only read access is
* provided. The 16-bit/32-bit read are compatible with driver model RTC
* uclass write ops, that data is stored in little-endian mode.
*/
#include <common.h>
#include <asm/early_cmos.h>
#include <asm/io.h>
u8 cmos_read8(u8 addr)
{
outb(addr, CMOS_IO_PORT);
return inb(CMOS_IO_PORT + 1);
}
u16 cmos_read16(u8 addr)
{
u16 value = 0;
u16 data;
int i;
for (i = 0; i < sizeof(value); i++) {
data = cmos_read8(addr + i);
value |= data << (i << 3);
}
return value;
}
u32 cmos_read32(u8 addr)
{
u32 value = 0;
u32 data;
int i;
for (i = 0; i < sizeof(value); i++) {
data = cmos_read8(addr + i);
value |= data << (i << 3);
}
return value;
}
|
