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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2012 secunet Security Networks AG
* Copyright (C) 2013 Edward O'Callaghan <eocallaghan@alterapraxis.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <libpayload.h>
#include <pci.h>
#include <storage/ata.h>
#include <storage/ahci.h>
#include "ahci_private.h"
#ifdef DEBUG_STATUS
static inline u32 _ahci_clear_status(volatile u32 *const reg,
const char *const r,
const char *const f)
{
const u32 bits = *reg;
if (bits)
*reg = bits;
printf("ahci: %s: %s == 0x%08x\n", f, r, bits);
return bits;
}
#define ahci_clear_status(p, r) _ahci_clear_status(&(p)->r, #r, __func__)
#else
static inline u32 _ahci_clear_status(volatile u32 *const reg)
{
const u32 bits = *reg;
if (bits)
*reg = bits;
return bits;
}
#define ahci_clear_status(p, r) _ahci_clear_status(&(p)->r)
#endif
/** Give a buffer with even address. */
static u8 *ahci_prdbuf_init(ahci_dev_t *const dev,
u8 *const user_buf, const size_t len,
const int out)
{
if ((u32)user_buf & 1) {
printf("ahci: Odd buffer pointer (%p).\n", user_buf);
if (dev->buf) /* orphaned buffer */
free((void *)dev->buf - *(dev->buf - 1));
dev->buf = malloc(len + 2);
if (!dev->buf)
return NULL;
dev->user_buf = user_buf;
dev->write_back = !out;
dev->buflen = len;
if ((u32)dev->buf & 1) {
dev->buf[0] = 1;
dev->buf += 1;
} else {
dev->buf[0] = 1;
dev->buf[1] = 2;
dev->buf += 2;
}
if (out)
memcpy(dev->buf, user_buf, len);
return dev->buf;
} else {
return user_buf;
}
}
static void ahci_prdbuf_finalize(ahci_dev_t *const dev)
{
if (dev->buf) {
if (dev->write_back)
memcpy(dev->user_buf, dev->buf, dev->buflen);
free((void *)dev->buf - *(dev->buf - 1));
}
dev->buf = NULL;
dev->user_buf = NULL;
dev->write_back = 0;
dev->buflen = 0;
}
int ahci_cmdengine_start(hba_port_t *const port)
{
/* CR has to be clear before starting the command engine.
This shouldn't take too long, but we should time out nevertheless. */
int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during start of command engine.\n");
return 1;
}
port->cmd_stat |= HBA_PxCMD_FRE;
port->cmd_stat |= HBA_PxCMD_ST;
return 0;
}
int ahci_cmdengine_stop(hba_port_t *const port)
{
port->cmd_stat &= ~HBA_PxCMD_ST;
/* Wait for the controller to clear CR.
This shouldn't take too long, but we should time out nevertheless. */
int timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_CR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during stopping of command engine.\n");
return 1;
}
port->cmd_stat &= ~HBA_PxCMD_FRE;
/* Wait for the controller to clear FR.
This shouldn't take too long, but we should time out nevertheless. */
timeout = 1000; /* Time out after 1000 * 1us == 1ms. */
while ((port->cmd_stat & HBA_PxCMD_FR) && timeout--)
udelay(1);
if (timeout < 0) {
printf("ahci: Timeout during stopping of command engine.\n");
return 1;
}
return 0;
}
ssize_t ahci_cmdslot_exec(ahci_dev_t *const dev)
{
const int slotnum = 0; /* We always use the first slot. */
if (!(dev->port->cmd_stat & HBA_PxCMD_CR))
return -1;
/* Trigger command execution. */
dev->port->cmd_issue |= (1 << slotnum);
/* Wait for the controller to finish command execution. */
int timeout = 50000; /* Time out after 50000 * 100us == 5s. */
while ((dev->port->cmd_issue & (1 << slotnum)) &&
!(dev->port->intr_status & HBA_PxIS_TFES) &&
timeout--)
udelay(100);
if (timeout < 0) {
printf("ahci: Timeout during command execution.\n");
return -1;
}
ahci_prdbuf_finalize(dev);
const u32 intr_status = ahci_clear_status(dev->port, intr_status);
if (intr_status & (HBA_PxIS_FATAL | HBA_PxIS_PCS)) {
ahci_error_recovery(dev, intr_status);
return -1;
} else {
return dev->cmdlist[slotnum].prd_bytes;
}
}
size_t ahci_cmdslot_prepare(ahci_dev_t *const dev,
u8 *const user_buf, size_t buf_len,
const int out)
{
const int slotnum = 0; /* We always use the first slot. */
size_t read_count = 0;
memset((void *)&dev->cmdlist[slotnum],
'\0', sizeof(dev->cmdlist[slotnum]));
memset((void *)dev->cmdtable,
'\0', sizeof(*dev->cmdtable));
dev->cmdlist[slotnum].cmd = CMD_CFL(FIS_H2D_FIS_LEN);
dev->cmdlist[slotnum].cmdtable_base = virt_to_phys(dev->cmdtable);
if (buf_len > 0) {
size_t prdt_len;
u8 *buf;
int i;
prdt_len = ((buf_len - 1) >> BYTES_PER_PRD_SHIFT) + 1;
const size_t max_prdt_len = ARRAY_SIZE(dev->cmdtable->prdt);
if (prdt_len > max_prdt_len) {
prdt_len = max_prdt_len;
buf_len = prdt_len << BYTES_PER_PRD_SHIFT;
}
dev->cmdlist[slotnum].prdt_length = prdt_len;
read_count = buf_len;
buf = ahci_prdbuf_init(dev, user_buf, buf_len, out);
if (!buf)
return 0;
for (i = 0; i < prdt_len; ++i) {
const size_t bytes =
(buf_len < BYTES_PER_PRD)
? buf_len : BYTES_PER_PRD;
dev->cmdtable->prdt[i].data_base = virt_to_phys(buf);
dev->cmdtable->prdt[i].flags = PRD_TABLE_BYTES(bytes);
buf_len -= bytes;
buf += bytes;
}
}
return read_count;
}
int ahci_identify_device(ata_dev_t *const ata_dev, u8 *const buf)
{
ahci_dev_t *const dev = (ahci_dev_t *)ata_dev;
ahci_cmdslot_prepare(dev, buf, 512, 0);
dev->cmdtable->fis[0] = FIS_HOST_TO_DEVICE;
dev->cmdtable->fis[1] = FIS_H2D_CMD;
dev->cmdtable->fis[2] = ata_dev->identify_cmd;
if ((ahci_cmdslot_exec(dev) < 0) || (dev->cmdlist->prd_bytes != 512))
return -1;
else
return 0;
}
|
