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
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdint.h>
#include <string.h>
#include <arch/io.h>
#include <device/device.h>
#include <device/pci.h>
#include <soc/pcr.h>
#include <soc/iomap.h>
#include <console/console.h>
static inline void *pcr_reg_address(u8 pid, u16 offset)
{
uintptr_t reg_addr;
/* Create an address based off of port id and offset. */
reg_addr = PCH_PCR_BASE_ADDRESS;
reg_addr += ((uintptr_t)pid) << PCR_PORTID_SHIFT;
reg_addr += ((uintptr_t)offset) << PCR_OFFSET_SHIFT;
return (void *)reg_addr;
}
uint8_t *pcr_port_regs(u8 pid)
{
return pcr_reg_address(pid, 0);
}
/*
* Read PCR register. (This is internal function)
* It returns PCR register and size in 1/2/4 bytes.
* The offset should not exceed 0xFFFF and must be aligned with size
*/
static int pch_pcr_read(u8 pid, u16 offset, u32 size, void *data)
{
if ((offset & (size - 1)) != 0) {
printk(BIOS_DEBUG,
"PchPcrRead error. Invalid Offset: %x Size: %x",
offset, size);
return -1;
}
switch (size) {
case 4:
*(u32 *) data = read32(pcr_reg_address(pid, offset));
break;
case 2:
*(u16 *) data = read16(pcr_reg_address(pid, offset));
break;
case 1:
*(u8 *) data = read8(pcr_reg_address(pid, offset));
break;
default:
return -1;
}
return 0;
}
int pcr_read32(u8 pid, u16 offset, u32 *outdata)
{
return pch_pcr_read(pid, offset, sizeof(u32), (u32 *)outdata);
}
int pcr_read16(u8 pid, u16 offset, u16 *outdata)
{
return pch_pcr_read(pid, offset, sizeof(u16), (u32 *)outdata);
}
int pcr_read8(u8 pid, u16 offset, u8 *outdata)
{
return pch_pcr_read(pid, offset, sizeof(u8), (u32 *)outdata);
}
/*
* After every write one needs to perform a read an innocuous register to
* ensure the writes are completed for certain ports. This is done for
* all ports so that the callers don't need the per-port knowledge for
* each transaction.
*/
static inline void complete_write(void)
{
/* Read the general control and function disable register. */
const size_t R_PCH_PCR_LPC_GCFD = 0x3418;
read32(pcr_reg_address(PID_LPC, R_PCH_PCR_LPC_GCFD));
}
/*
* Write PCR register. (This is internal function)
* It returns PCR register and size in 1/2/4 bytes.
* The offset should not exceed 0xFFFF and must be aligned with size
*/
static int pch_pcr_write(u8 pid, u16 offset, u32 size, u32 data)
{
if ((offset & (size - 1)) != 0) {
printk(BIOS_DEBUG,
"PchPcrWrite error. Invalid Offset: %x Size: %x",
offset, size);
return -1;
}
/* Write the PCR register with provided data
* Then read back PCR register to prevent from back to back write.
*/
switch (size) {
case 4:
write32(pcr_reg_address(pid, offset), (u32) data);
break;
case 2:
write16(pcr_reg_address(pid, offset), (u16) data);
break;
case 1:
write8(pcr_reg_address(pid, offset), (u8) data);
break;
default:
return -1;
}
/* Ensure the writes complete. */
complete_write();
return 0;
}
int pcr_write32(u8 pid, u16 offset, u32 indata)
{
return pch_pcr_write(pid, offset, sizeof(u32), indata);
}
int pcr_write16(u8 pid, u16 offset, u16 indata)
{
return pch_pcr_write(pid, offset, sizeof(u16), indata);
}
int pcr_write8(u8 pid, u16 offset, u8 indata)
{
return pch_pcr_write(pid, offset, sizeof(u8), indata);
}
/*
* Write PCR register. (This is internal function)
* It programs PCR register and size in 1/2/4 bytes.
* The offset should not exceed 0xFFFF and must be aligned with size
*
* u8 defines as 8 bit Port ID that will be used when sending
* transaction to sideband.
*/
static int pcr_and_then_or(u8 pid, u16 offset, u32 size, u32 anddata,
u32 ordata)
{
u8 status;
u32 data32 = 0;
status = pch_pcr_read(pid, offset, size, &data32);
if (status != 0)
return -1;
data32 &= anddata;
data32 |= ordata;
status = pch_pcr_write(pid, offset, size, data32);
return status;
}
int pcr_andthenor32(u8 pid, u16 offset, u32 anddata, u32 ordata)
{
return pcr_and_then_or(pid, offset, sizeof(u32), anddata, ordata);
}
int pcr_andthenor16(u8 pid, u16 offset, u16 anddata, u16 ordata)
{
return pcr_and_then_or(pid, offset, sizeof(u16), anddata, ordata);
}
int pcr_andthenor8(u8 pid, u16 offset, u8 anddata, u8 ordata)
{
return pcr_and_then_or(pid, offset, sizeof(u8), anddata, ordata);
}
|
