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
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
// SPDX-License-Identifier: Apache-2.0
/*
* NVRAM support
*
* Copyright 2013-2018 IBM Corp.
*/
#include <skiboot.h>
#include <fsp.h>
#include <opal.h>
#include <lock.h>
#include <device.h>
#include <platform.h>
#include <nvram.h>
#include <timebase.h>
static void *nvram_image;
static uint32_t nvram_size;
static bool nvram_ready; /* has the nvram been loaded? */
static bool nvram_valid; /* is the nvram format ok? */
static int64_t opal_read_nvram(uint64_t buffer, uint64_t size, uint64_t offset)
{
if (!nvram_ready)
return OPAL_HARDWARE;
if (!opal_addr_valid((void *)buffer))
return OPAL_PARAMETER;
if (offset >= nvram_size || (offset + size) > nvram_size)
return OPAL_PARAMETER;
memcpy((void *)buffer, nvram_image + offset, size);
return OPAL_SUCCESS;
}
opal_call(OPAL_READ_NVRAM, opal_read_nvram, 3);
static int64_t opal_write_nvram(uint64_t buffer, uint64_t size, uint64_t offset)
{
if (!nvram_ready)
return OPAL_HARDWARE;
if (!opal_addr_valid((void *)buffer))
return OPAL_PARAMETER;
if (offset >= nvram_size || (offset + size) > nvram_size)
return OPAL_PARAMETER;
memcpy(nvram_image + offset, (void *)buffer, size);
if (platform.nvram_write)
platform.nvram_write(offset, nvram_image + offset, size);
/* The host OS has written to the NVRAM so we can't be sure that it's
* well formatted.
*/
nvram_valid = false;
return OPAL_SUCCESS;
}
opal_call(OPAL_WRITE_NVRAM, opal_write_nvram, 3);
bool nvram_validate(void)
{
if (!nvram_valid) {
if (!nvram_check(nvram_image, nvram_size))
nvram_valid = true;
}
return nvram_valid;
}
static void nvram_reformat(void)
{
if (nvram_format(nvram_image, nvram_size)) {
prerror("NVRAM: Failed to format NVRAM!\n");
nvram_valid = false;
return;
}
/* Write the whole thing back */
if (platform.nvram_write)
platform.nvram_write(0, nvram_image, nvram_size);
nvram_validate();
}
void nvram_reinit(void)
{
/* It's possible we failed to load nvram at boot. */
if (!nvram_ready)
nvram_init();
else if (!nvram_validate())
nvram_reformat();
}
void nvram_read_complete(bool success)
{
struct dt_node *np;
/* Read not successful, error out and free the buffer */
if (!success) {
free(nvram_image);
nvram_size = 0;
return;
}
if (!nvram_validate())
nvram_reformat();
/* Add nvram node */
np = dt_new(opal_node, "nvram");
dt_add_property_cells(np, "#bytes", nvram_size);
dt_add_property_string(np, "compatible", "ibm,opal-nvram");
/* Mark ready */
nvram_ready = true;
}
bool nvram_wait_for_load(void)
{
uint64_t started;
/* Short cut */
if (nvram_ready)
return true;
/* Tell the caller it will never happen */
if (!platform.nvram_info)
return false;
/*
* One of two things has happened here.
* 1. nvram_wait_for_load() was called before nvram_init()
* 2. The read of NVRAM failed.
* Either way, this is quite a bad event.
*/
if (!nvram_image && !nvram_size) {
prlog(PR_CRIT, "NVRAM: Possible wait before nvram_init()!\n");
return false;
}
started = mftb();
while (!nvram_ready) {
opal_run_pollers();
/* If the read fails, tell the caller */
if (!nvram_image && !nvram_size)
return false;
}
prlog(PR_DEBUG, "NVRAM: Waited %lums for nvram to load\n",
tb_to_msecs(mftb() - started));
return true;
}
bool nvram_has_loaded(void)
{
return nvram_ready;
}
void nvram_init(void)
{
int rc;
if (!platform.nvram_info)
return;
rc = platform.nvram_info(&nvram_size);
if (rc) {
prerror("NVRAM: Error %d retrieving nvram info\n", rc);
return;
}
prlog(PR_INFO, "NVRAM: Size is %d KB\n", nvram_size >> 10);
if (nvram_size > 0x100000) {
prlog(PR_WARNING, "NVRAM: Cropping to 1MB !\n");
nvram_size = 0x100000;
}
/*
* We allocate the nvram image with 4k alignment to make the
* FSP backend job's easier
*/
nvram_image = memalign(0x1000, nvram_size);
if (!nvram_image) {
prerror("NVRAM: Failed to allocate nvram image\n");
nvram_size = 0;
return;
}
/* Read it in */
rc = platform.nvram_start_read(nvram_image, 0, nvram_size);
if (rc) {
prerror("NVRAM: Failed to read NVRAM from FSP !\n");
nvram_size = 0;
free(nvram_image);
return;
}
/*
* We'll get called back later (or recursively from
* nvram_start_read) in nvram_read_complete()
*/
}
|
