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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*
* Copied from Linux drivers/gpu/drm/ast/ast_mode.c
*
* Copyright 2012 Red Hat Inc.
* Parts based on xf86-video-ast
* Copyright (c) 2005 ASPEED Technology Inc.
* Copyright Dave Airlie <airlied@redhat.com>
* Copyright 2019 9Elements Agency GmbH <patrick.rudolph@9elements.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*/
#include <delay.h>
#include <device/i2c_simple.h>
#include "ast_drv.h"
static struct ast_private *ast;
#define _GET_INDEX_REG(x) ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, (x))
#define ASPEED_BUS 0
static int get_clock(unsigned int bus)
{
uint32_t val, val2, count, pass;
count = 0;
pass = 0;
val = (_GET_INDEX_REG(0x10) >> 4) & 0x01;
do {
val2 = (_GET_INDEX_REG(0x10) >> 4) & 0x01;
if (val == val2) {
pass++;
} else {
pass = 0;
val = (_GET_INDEX_REG(0x10) >> 4) & 0x01;
}
} while ((pass < 5) && (count++ < 0x10000));
return val & 1 ? 1 : 0;
}
static int get_data(unsigned int bus)
{
uint32_t val, val2, count, pass;
count = 0;
pass = 0;
val = (_GET_INDEX_REG(0x20) >> 5) & 0x01;
do {
val2 = (_GET_INDEX_REG(0x20) >> 5) & 0x01;
if (val == val2) {
pass++;
} else {
pass = 0;
val = (_GET_INDEX_REG(0x20) >> 5) & 0x01;
}
} while ((pass < 5) && (count++ < 0x10000));
return val & 1 ? 1 : 0;
}
static void set_clock(unsigned int bus, int clock)
{
int i;
u8 ujcrb7, jtemp;
for (i = 0; i < 0x10000; i++) {
ujcrb7 = ((clock & 0x01) ? 0 : 1);
ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf4, ujcrb7);
jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x01);
if (ujcrb7 == jtemp)
break;
}
}
static void set_data(unsigned int bus, int data)
{
int i;
u8 ujcrb7, jtemp;
for (i = 0; i < 0x10000; i++) {
ujcrb7 = ((data & 0x01) ? 0 : 1) << 2;
ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf1, ujcrb7);
jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0x04);
if (ujcrb7 == jtemp)
break;
}
}
static struct software_i2c_ops ast_ops = {
.set_sda = set_data,
.set_scl = set_clock,
.get_sda = get_data,
.get_scl = get_clock,
};
int ast_software_i2c_read(struct ast_private *ast_priv, uint8_t edid[128])
{
struct software_i2c_ops *backup;
int ret;
backup = software_i2c[ASPEED_BUS];
software_i2c[ASPEED_BUS] = &ast_ops;
ast = ast_priv;
/* Ast POST pulled SDA and SCL low, recover the bus to a known state */
set_clock(ASPEED_BUS, 1);
set_data(ASPEED_BUS, 1);
udelay(100);
/* Need to reset internal EEPROM counter to 0 */
ret = i2c_read_bytes(ASPEED_BUS, 0x50, 0, edid, 128);
software_i2c[ASPEED_BUS] = backup;
return ret;
}
|
