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
|
/*
* Copyright (c) 2010-2013 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#define NDEBUG
#include <bsp/ata.h>
#include <bsp.h>
#include <bsp/fatal.h>
#include <bsp/mpc5200.h>
#include <libcpu/powerpc-utility.h>
bool ata_execute_io_command(uint8_t command, uint32_t lba, uint32_t sector_count_32)
{
assert(sector_count_32 >= 1);
assert(sector_count_32 <= 256);
assert(ata_is_drive_ready_for_selection());
ATA->write.head = (uint8_t) (0xe0 | ((lba >> 24) & 0x0f));
ata_wait_400_nano_seconds();
ata_wait_for_drive_ready();
/*
* It seems that the write to the ATA device registers is sometimes not
* successful. The write is retried until the read back values are all right
* or a timeout is reached.
*/
bool ok = false;
uint8_t sector = (uint8_t) lba;
uint8_t cylinder_low = (uint8_t) (lba >> 8);
uint8_t cylinder_high = (uint8_t) (lba >> 16);
uint8_t sector_count = (uint8_t) sector_count_32;
int i;
for (i = 0; !ok && i < 100; ++i) {
ATA->write.sector = sector;
ATA->write.cylinder_low = cylinder_low;
ATA->write.cylinder_high = cylinder_high;
ATA->write.sector_count = sector_count;
uint8_t actual_sector = ATA->read.sector;
uint8_t actual_cylinder_low = ATA->read.cylinder_low;
uint8_t actual_cylinder_high = ATA->read.cylinder_high;
uint8_t actual_sector_count = ATA->read.sector_count;
ok = actual_cylinder_high == cylinder_high
&& actual_cylinder_low == cylinder_low
&& actual_sector == sector
&& actual_sector_count == sector_count;
}
if (ok) {
ATA->write.command = command;
}
return ok;
}
void ata_reset_device(void)
{
/* ATA/ATAPI-7 V2, 11.2 Software reset protocol */
ATA->write.control = DCTRL_SRST;
rtems_bsp_delay(5);
ATA->write.control = 0;
rtems_bsp_delay(2000);
ata_wait_for_not_busy();
}
bool ata_set_transfer_mode(uint8_t mode)
{
assert(ata_is_drive_ready_for_selection());
ATA->write.head = 0xe0;
ata_wait_400_nano_seconds();
ata_wait_for_drive_ready();
ATA->write.feature = 0x3;
ATA->write.sector_count = mode;
ATA->write.command = 0xef;
ata_wait_for_not_busy();
return ata_check_status();
}
static bool probe(void)
{
bool card_present = true;
#ifdef MPC5200_BOARD_BRS5L
volatile struct mpc5200_gpt *gpt = &mpc5200.gpt[GPT2];
/* Enable card detection on GPT2 */
gpt->emsel = (GPT_EMSEL_GPIO_IN | GPT_EMSEL_TIMER_MS_GPIO);
/* Check for card detection (-CD0) */
if ((gpt->status & GPT_STATUS_PIN) != 0) {
card_present = false;
}
#endif
return card_present;
}
static void create_lock(ata_driver *self)
{
rtems_status_code sc = rtems_semaphore_create(
rtems_build_name('A', 'T', 'A', ' '),
1,
RTEMS_LOCAL | RTEMS_BINARY_SEMAPHORE | RTEMS_PRIORITY | RTEMS_INHERIT_PRIORITY,
0,
&self->lock
);
if (sc != RTEMS_SUCCESSFUL) {
bsp_fatal(MPC5200_FATAL_ATA_LOCK_CREATE);
}
}
static void destroy_lock(const ata_driver *self)
{
rtems_status_code sc = rtems_semaphore_delete(self->lock);
if (sc != RTEMS_SUCCESSFUL) {
bsp_fatal(MPC5200_FATAL_ATA_LOCK_DESTROY);
}
}
void ata_driver_create(ata_driver *self, const char *device_file_path, rtems_block_device_ioctl io_control)
{
self->card_present = probe();
if (ata_driver_is_card_present(self)) {
create_lock(self);
ata_reset_device();
uint16_t sector_buffer[256];
ata_dev_t ata_device;
rtems_status_code sc = ata_identify_device(0, 0, sector_buffer, &ata_device);
if (sc == RTEMS_SUCCESSFUL && ata_device.lba_avaible) {
sc = ide_controller_config_io_speed(0, ata_device.modes_available);
if (sc == RTEMS_SUCCESSFUL) {
sc = rtems_blkdev_create(
device_file_path,
ATA_SECTOR_SIZE,
ata_device.lba_sectors,
io_control,
self
);
if (sc != RTEMS_SUCCESSFUL) {
bsp_fatal(MPC5200_FATAL_ATA_DISK_CREATE);
}
}
}
}
}
void ata_driver_destroy(ata_driver *self)
{
destroy_lock(self);
/* TODO */
assert(0);
}
static bool transfer_pio_polled(ata_driver *self, bool read, rtems_blkdev_sg_buffer *sg, size_t sg_count)
{
bool ok = true;
ata_sg_context sg_context;
ata_sg_create(&sg_context, sg, sg_count);
rtems_blkdev_bnum start_sector = ata_sg_get_start_sector(&sg_context);
rtems_blkdev_bnum sector_count = ata_sg_get_sector_count(&sg_context);
rtems_blkdev_bnum relative_sector = 0;
uint8_t command = ata_read_or_write_sectors_command(read);
while (ok && relative_sector < sector_count) {
rtems_blkdev_bnum remaining_sectors = sector_count - relative_sector;
rtems_blkdev_bnum transfer_count = ata_max_transfer_count(remaining_sectors);
rtems_blkdev_bnum transfer_end = relative_sector + transfer_count;
ok = ata_execute_io_command(command, start_sector + relative_sector, transfer_count);
rtems_blkdev_bnum transfer;
for (transfer = relative_sector; ok && transfer < transfer_end; ++transfer) {
uint16_t *current = ata_sg_get_sector_data_begin(&sg_context, transfer);
uint16_t *end = ata_sg_get_sector_data_end(&sg_context, current);
ok = ata_wait_for_data_request();
if (ok) {
if (read) {
while (current != end) {
*current = ATA->read.data;
++current;
}
} else {
while (current != end) {
ATA->write.data = *current;
++current;
}
}
}
}
if (ok) {
ata_wait_for_not_busy();
ok = ata_check_status();
}
relative_sector += ATA_PER_TRANSFER_SECTOR_COUNT_MAX;
}
return ok;
}
int ata_driver_io_control_pio_polled(
rtems_disk_device *dd,
uint32_t cmd,
void *arg
)
{
return ata_driver_io_control(dd, cmd, arg, transfer_pio_polled);
}
|
