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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/azalia_device.h>
#include <device/mmio.h>
#include <delay.h>
#include "hda_verb.h"
int hda_codec_detect(u8 *base)
{
u8 reg8;
/* Set Bit 0 to 1 to exit reset state (BAR + 0x8)[0] */
if (azalia_exit_reset(base) < 0)
goto no_codec;
/* Write back the value once reset bit is set. */
write16(base + HDA_GCAP_REG, read16(base + HDA_GCAP_REG));
/*
* Clear the "State Change Status Register" STATESTS bits
* for each of the "SDIN Stat Change Status Flag"
*/
write8(base + HDA_STATESTS_REG, 0xf);
/* Turn off the link and poll RESET# bit until it reads back as 0 */
if (azalia_enter_reset(base) < 0)
goto no_codec;
/* Turn on the link and poll RESET# bit until it reads back as 1 */
if (azalia_exit_reset(base) < 0)
goto no_codec;
/* Read in Codec location (BAR + 0xe)[2..0] */
reg8 = read8(base + HDA_STATESTS_REG);
reg8 &= 0x0f;
if (!reg8)
goto no_codec;
return reg8;
no_codec:
/* Codec not found, put HDA back in reset */
azalia_enter_reset(base);
printk(BIOS_DEBUG, "HDA: No codec!\n");
return 0;
}
/*
* Wait 50usec for the codec to indicate it is ready.
* No response would imply that the codec is non-operative.
*/
static int hda_wait_for_ready(u8 *base)
{
/* Use a 50 usec timeout - the Linux kernel uses the same duration */
int timeout = 50;
while (timeout--) {
u32 reg32 = read32(base + HDA_ICII_REG);
if (!(reg32 & HDA_ICII_BUSY))
return 0;
udelay(1);
}
return -1;
}
/*
* Wait 50usec for the codec to indicate that it accepted the previous command.
* No response would imply that the code is non-operative.
*/
static int hda_wait_for_valid(u8 *base)
{
u32 reg32;
/* Use a 50 usec timeout - the Linux kernel uses the same duration */
int timeout = 50;
/* Send the verb to the codec */
reg32 = read32(base + HDA_ICII_REG);
reg32 |= HDA_ICII_BUSY | HDA_ICII_VALID;
write32(base + HDA_ICII_REG, reg32);
while (timeout--) {
reg32 = read32(base + HDA_ICII_REG);
if ((reg32 & (HDA_ICII_VALID | HDA_ICII_BUSY)) == HDA_ICII_VALID)
return 0;
udelay(1);
}
return -1;
}
int hda_codec_write(u8 *base, u32 size, const u32 *data)
{
int i;
for (i = 0; i < size; i++) {
if (hda_wait_for_ready(base) < 0)
return -1;
write32(base + HDA_IC_REG, data[i]);
if (hda_wait_for_valid(base) < 0)
return -1;
}
return 0;
}
int hda_codec_init(u8 *base, int addr, int verb_size, const u32 *verb_data)
{
const u32 *verb;
u32 reg32, size;
int rc;
printk(BIOS_DEBUG, "HDA: Initializing codec #%d\n", addr);
if (!verb_size || !verb_data) {
printk(BIOS_DEBUG, "HDA: No verb list!\n");
return -1;
}
/* 1 */
if (hda_wait_for_ready(base) < 0) {
printk(BIOS_DEBUG, " codec not ready.\n");
return -1;
}
reg32 = (addr << 28) | 0x000f0000;
write32(base + HDA_IC_REG, reg32);
if (hda_wait_for_valid(base) < 0) {
printk(BIOS_DEBUG, " codec not valid.\n");
return -1;
}
/* 2 */
reg32 = read32(base + HDA_IR_REG);
printk(BIOS_DEBUG, "HDA: codec viddid: %08x\n", reg32);
size = azalia_find_verb(verb_data, verb_size, reg32, &verb);
if (!size) {
printk(BIOS_DEBUG, "HDA: No verb table entry found\n");
return -1;
}
/* 3 */
rc = hda_codec_write(base, size, verb);
if (rc < 0)
printk(BIOS_DEBUG, "HDA: verb not loaded\n");
else
printk(BIOS_DEBUG, "HDA: verb loaded.\n");
return rc;
}
|
