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1 | /* | |
2 | * This file is part of the libsigrok project. | |
3 | * | |
4 | * Copyright (C) 2014 Daniel Elstner <daniel.kitta@gmail.com> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include "lwla.h" | |
21 | #include "protocol.h" | |
22 | #include "libsigrok-internal.h" | |
23 | #include <errno.h> | |
24 | #include <glib/gstdio.h> | |
25 | ||
26 | #define BITSTREAM_MAX_SIZE 262144 /* bitstream size limit for safety */ | |
27 | #define BITSTREAM_HEADER_SIZE 4 /* transfer header size in bytes */ | |
28 | ||
29 | /* Load a bitstream file into memory. Returns a newly allocated array | |
30 | * consisting of a 32-bit length field followed by the bitstream data. | |
31 | */ | |
32 | static unsigned char *load_bitstream_file(const char *filename, int *length_p) | |
33 | { | |
34 | GStatBuf statbuf; | |
35 | FILE *file; | |
36 | unsigned char *stream; | |
37 | size_t length, count; | |
38 | ||
39 | /* Retrieve and validate the file size. */ | |
40 | if (g_stat(filename, &statbuf) < 0) { | |
41 | sr_err("Failed to access bitstream file: %s.", | |
42 | g_strerror(errno)); | |
43 | return NULL; | |
44 | } | |
45 | if (!S_ISREG(statbuf.st_mode)) { | |
46 | sr_err("Bitstream is not a regular file."); | |
47 | return NULL; | |
48 | } | |
49 | if (statbuf.st_size <= 0 || statbuf.st_size > BITSTREAM_MAX_SIZE) { | |
50 | sr_err("Refusing to load bitstream of unreasonable size " | |
51 | "(%" PRIu64 " bytes).", (uint64_t)statbuf.st_size); | |
52 | return NULL; | |
53 | } | |
54 | ||
55 | /* The message length includes the 4-byte header. */ | |
56 | length = BITSTREAM_HEADER_SIZE + statbuf.st_size; | |
57 | stream = g_try_malloc(length); | |
58 | if (!stream) { | |
59 | sr_err("Failed to allocate bitstream buffer."); | |
60 | return NULL; | |
61 | } | |
62 | ||
63 | file = g_fopen(filename, "rb"); | |
64 | if (!file) { | |
65 | sr_err("Failed to open bitstream file: %s.", g_strerror(errno)); | |
66 | g_free(stream); | |
67 | return NULL; | |
68 | } | |
69 | ||
70 | /* Write the message length header. */ | |
71 | *(uint32_t *)stream = GUINT32_TO_BE(length); | |
72 | ||
73 | count = fread(stream + BITSTREAM_HEADER_SIZE, | |
74 | length - BITSTREAM_HEADER_SIZE, 1, file); | |
75 | if (count != 1) { | |
76 | sr_err("Failed to read bitstream file: %s.", g_strerror(errno)); | |
77 | fclose(file); | |
78 | g_free(stream); | |
79 | return NULL; | |
80 | } | |
81 | fclose(file); | |
82 | ||
83 | *length_p = length; | |
84 | return stream; | |
85 | } | |
86 | ||
87 | /* Load a Raw Binary File (.rbf) from the firmware directory and transfer | |
88 | * it to the device. | |
89 | */ | |
90 | SR_PRIV int lwla_send_bitstream(const struct sr_usb_dev_inst *usb, | |
91 | const char *basename) | |
92 | { | |
93 | char *filename; | |
94 | unsigned char *stream; | |
95 | int ret; | |
96 | int length; | |
97 | int xfer_len; | |
98 | ||
99 | if (!usb || !basename) | |
100 | return SR_ERR_BUG; | |
101 | ||
102 | filename = g_build_filename(FIRMWARE_DIR, basename, NULL); | |
103 | sr_info("Downloading FPGA bitstream at '%s'.", filename); | |
104 | ||
105 | stream = load_bitstream_file(filename, &length); | |
106 | g_free(filename); | |
107 | ||
108 | if (!stream) | |
109 | return SR_ERR; | |
110 | ||
111 | /* Transfer the entire bitstream in one URB. */ | |
112 | ret = libusb_bulk_transfer(usb->devhdl, EP_BITSTREAM, | |
113 | stream, length, &xfer_len, USB_TIMEOUT); | |
114 | g_free(stream); | |
115 | ||
116 | if (ret != 0) { | |
117 | sr_err("Failed to transfer bitstream: %s.", | |
118 | libusb_error_name(ret)); | |
119 | return SR_ERR; | |
120 | } | |
121 | if (xfer_len != length) { | |
122 | sr_err("Failed to transfer bitstream: incorrect length " | |
123 | "%d != %d.", xfer_len, length); | |
124 | return SR_ERR; | |
125 | } | |
126 | sr_info("FPGA bitstream download of %d bytes done.", xfer_len); | |
127 | ||
128 | /* This delay appears to be necessary for reliable operation. */ | |
129 | g_usleep(30000); | |
130 | ||
131 | return SR_OK; | |
132 | } | |
133 | ||
134 | SR_PRIV int lwla_send_command(const struct sr_usb_dev_inst *usb, | |
135 | const uint16_t *command, int cmd_len) | |
136 | { | |
137 | int ret; | |
138 | int xfer_len; | |
139 | ||
140 | if (!usb || !command || cmd_len <= 0) | |
141 | return SR_ERR_BUG; | |
142 | ||
143 | xfer_len = 0; | |
144 | ret = libusb_bulk_transfer(usb->devhdl, EP_COMMAND, | |
145 | (unsigned char *)command, cmd_len * 2, | |
146 | &xfer_len, USB_TIMEOUT); | |
147 | if (ret != 0) { | |
148 | sr_dbg("Failed to send command %d: %s.", | |
149 | LWLA_TO_UINT16(command[0]), libusb_error_name(ret)); | |
150 | return SR_ERR; | |
151 | } | |
152 | if (xfer_len != cmd_len * 2) { | |
153 | sr_dbg("Failed to send command %d: incorrect length %d != %d.", | |
154 | LWLA_TO_UINT16(command[0]), xfer_len, cmd_len * 2); | |
155 | return SR_ERR; | |
156 | } | |
157 | return SR_OK; | |
158 | } | |
159 | ||
160 | SR_PRIV int lwla_receive_reply(const struct sr_usb_dev_inst *usb, | |
161 | uint32_t *reply, int reply_len, int expect_len) | |
162 | { | |
163 | int ret; | |
164 | int xfer_len; | |
165 | ||
166 | if (!usb || !reply || reply_len <= 0) | |
167 | return SR_ERR_BUG; | |
168 | ||
169 | xfer_len = 0; | |
170 | ret = libusb_bulk_transfer(usb->devhdl, EP_REPLY, | |
171 | (unsigned char *)reply, reply_len * 4, | |
172 | &xfer_len, USB_TIMEOUT); | |
173 | if (ret != 0) { | |
174 | sr_dbg("Failed to receive reply: %s.", libusb_error_name(ret)); | |
175 | return SR_ERR; | |
176 | } | |
177 | if (xfer_len != expect_len * 4) { | |
178 | sr_dbg("Failed to receive reply: incorrect length %d != %d.", | |
179 | xfer_len, expect_len * 4); | |
180 | return SR_ERR; | |
181 | } | |
182 | return SR_OK; | |
183 | } | |
184 | ||
185 | SR_PRIV int lwla_read_reg(const struct sr_usb_dev_inst *usb, | |
186 | uint16_t reg, uint32_t *value) | |
187 | { | |
188 | int ret; | |
189 | uint16_t command[2]; | |
190 | uint32_t reply[128]; /* full EP buffer to avoid overflows */ | |
191 | ||
192 | command[0] = LWLA_WORD(CMD_READ_REG); | |
193 | command[1] = LWLA_WORD(reg); | |
194 | ||
195 | ret = lwla_send_command(usb, command, G_N_ELEMENTS(command)); | |
196 | ||
197 | if (ret != SR_OK) | |
198 | return ret; | |
199 | ||
200 | ret = lwla_receive_reply(usb, reply, G_N_ELEMENTS(reply), 1); | |
201 | ||
202 | if (ret == SR_OK) | |
203 | *value = LWLA_TO_UINT32(reply[0]); | |
204 | ||
205 | return ret; | |
206 | } | |
207 | ||
208 | SR_PRIV int lwla_write_reg(const struct sr_usb_dev_inst *usb, | |
209 | uint16_t reg, uint32_t value) | |
210 | { | |
211 | uint16_t command[4]; | |
212 | ||
213 | command[0] = LWLA_WORD(CMD_WRITE_REG); | |
214 | command[1] = LWLA_WORD(reg); | |
215 | command[2] = LWLA_WORD_0(value); | |
216 | command[3] = LWLA_WORD_1(value); | |
217 | ||
218 | return lwla_send_command(usb, command, G_N_ELEMENTS(command)); | |
219 | } | |
220 | ||
221 | SR_PRIV int lwla_write_regs(const struct sr_usb_dev_inst *usb, | |
222 | const struct regval_pair *regvals, int count) | |
223 | { | |
224 | int i; | |
225 | int ret; | |
226 | ||
227 | ret = SR_OK; | |
228 | ||
229 | for (i = 0; i < count; ++i) { | |
230 | ret = lwla_write_reg(usb, regvals[i].reg, regvals[i].val); | |
231 | ||
232 | if (ret != SR_OK) | |
233 | break; | |
234 | } | |
235 | ||
236 | return ret; | |
237 | } |