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
|
/* -*- c++ -*- */
/*
* Copyright 2009 Free Software Foundation, Inc.
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "bsm12.h"
#include "memory_map.h"
#include "buffer_pool.h"
#include "bool.h"
#include "nonstdio.h"
#include "buffer_state.h"
#include <stdlib.h>
static uint32_t last_send_ctrl[NBUFFERS];
void
bsm12_init(bsm12_t *sm, int buf0,
const buf_cmd_args_t *recv,
const buf_cmd_args_t *send0,
const buf_cmd_args_t *send1,
bsm12_inspector_t inspect)
{
if (buf0 & 0x3) // precondition: buf0 % 4 == 0
abort();
sm->buf0 = buf0;
sm->running = false;
sm->recv_args = *recv;
sm->send_args[0] = *send0;
sm->send_args[1] = *send1;
sm->rx_idle = true;
sm->tx_idle[0] = true;
sm->tx_idle[1] = true;
sm->inspect = inspect;
sm->bps_error = BPS_ERROR(buf0 + 0) | BPS_ERROR(buf0 + 1) | BPS_ERROR(buf0 + 2);
sm->bps_done = BPS_DONE(buf0 + 0) | BPS_DONE(buf0 + 1) | BPS_DONE(buf0 + 2);
sm->bps_error_or_done = sm->bps_error | sm->bps_done;
// How much to adjust the last_line register.
// It's 1 for everything but the ethernet.
sm->last_line_adj = recv->port == PORT_ETH ? 3 : 1;
buffer_state[sm->buf0 + 0] = BS_EMPTY;
buffer_state[sm->buf0 + 1] = BS_EMPTY;
buffer_state[sm->buf0 + 2] = BS_EMPTY;
for (int i = 0; i < 3; i++){
sm->precomputed_receive_to_buf_ctrl_word[i] =
(BPC_READ
| BPC_BUFFER(sm->buf0 + i)
| BPC_PORT(sm->recv_args.port)
| BPC_STEP(1)
| BPC_FIRST_LINE(sm->recv_args.first_line)
| BPC_LAST_LINE(sm->recv_args.last_line));
for (int j = 0; j < 2; j++){
sm->precomputed_send_from_buf_ctrl_word[i][j] =
(BPC_WRITE
| BPC_BUFFER(sm->buf0 + i)
| BPC_PORT(sm->send_args[j].port)
| BPC_STEP(1)
| BPC_FIRST_LINE(sm->send_args[j].first_line)
| BPC_LAST_LINE(0)); // last line filled in at runtime
}
}
}
static inline void
bsm12_receive_to_buf(bsm12_t *sm, int bufno)
{
buffer_pool_ctrl->ctrl = sm->precomputed_receive_to_buf_ctrl_word[bufno & 0x3];
}
static inline void
bsm12_send_from_buf(bsm12_t *sm, int bufno, int dst_idx)
{
uint32_t t = (sm->precomputed_send_from_buf_ctrl_word[bufno & 0x3][dst_idx]
| BPC_LAST_LINE(buffer_pool_status->last_line[bufno] - sm->last_line_adj));
buffer_pool_ctrl->ctrl = t;
last_send_ctrl[bufno] = t;
}
static inline void
bsm12_resend_from_buf(bsm12_t *sm, int bufno)
{
buffer_pool_ctrl->ctrl = last_send_ctrl[bufno];
}
void
bsm12_start(bsm12_t *sm)
{
sm->running = true;
buffer_state[sm->buf0 + 0] = BS_EMPTY;
buffer_state[sm->buf0 + 1] = BS_EMPTY;
buffer_state[sm->buf0 + 2] = BS_EMPTY;
bp_clear_buf(sm->buf0 + 0);
bp_clear_buf(sm->buf0 + 1);
bp_clear_buf(sm->buf0 + 2);
sm->rx_idle = false;
sm->tx_idle[0] = true;
sm->tx_idle[1] = true;
bsm12_receive_to_buf(sm, sm->buf0);
buffer_state[sm->buf0] = BS_FILLING;
}
void
bsm12_stop(bsm12_t *sm)
{
sm->running = false;
bp_clear_buf(sm->buf0 + 0);
bp_clear_buf(sm->buf0 + 1);
bp_clear_buf(sm->buf0 + 2);
buffer_state[sm->buf0 + 0] = BS_EMPTY;
buffer_state[sm->buf0 + 1] = BS_EMPTY;
buffer_state[sm->buf0 + 2] = BS_EMPTY;
}
static void bsm12_process_helper(bsm12_t *sm, int buf_this);
static void bsm12_error_helper(bsm12_t *sm, int buf_this);
void
bsm12_process_status(bsm12_t *sm, uint32_t status)
{
// anything for us?
if ((status & sm->bps_error_or_done) == 0 || !sm->running)
return;
if (status & sm->bps_error){
// Most likely an ethernet Rx error. We just restart the transfer.
if (status & (BPS_ERROR(sm->buf0 + 0)))
bsm12_error_helper(sm, sm->buf0 + 0);
if (status & (BPS_ERROR(sm->buf0 + 1)))
bsm12_error_helper(sm, sm->buf0 + 1);
if (status & (BPS_ERROR(sm->buf0 + 2)))
bsm12_error_helper(sm, sm->buf0 + 2);
}
if (status & BPS_DONE(sm->buf0 + 0))
bsm12_process_helper(sm, sm->buf0 + 0);
if (status & BPS_DONE(sm->buf0 + 1))
bsm12_process_helper(sm, sm->buf0 + 1);
if (status & BPS_DONE(sm->buf0 + 2))
bsm12_process_helper(sm, sm->buf0 + 2);
}
static void
bsm12_process_helper(bsm12_t *sm, int buf_this)
{
}
static void
bsm12_error_helper(bsm12_t *sm, int buf_this)
{
bp_clear_buf(buf_this); // clears ERROR flag
if (buffer_state[buf_this] == BS_FILLING){
bsm12_receive_to_buf(sm, buf_this); // restart the xfer
}
else { // buffer was emptying
bsm12_resend_from_buf(sm, buf_this); // restart the xfer
}
}
void
bsm12_handle_tx_underrun(bsm12_t *sm)
{
}
void
bsm12_handle_rx_overrun(bsm12_t *sm)
{
}
|
