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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 <config.h> | |
21 | #include <glib/gstdio.h> | |
22 | #include <libsigrok/libsigrok.h> | |
23 | #include <libsigrok-internal.h> | |
24 | #include "lwla.h" | |
25 | #include "protocol.h" | |
26 | ||
27 | #define BITSTREAM_MAX_SIZE (256 * 1024) /* Bitstream size limit for safety */ | |
28 | #define BITSTREAM_HEADER_SIZE 4 /* Transfer header size in bytes */ | |
29 | ||
30 | /* Load a bitstream file into memory. Returns a newly allocated array | |
31 | * consisting of a 32-bit length field followed by the bitstream data. | |
32 | */ | |
33 | static unsigned char *load_bitstream(struct sr_context *ctx, | |
34 | const char *name, int *length_p) | |
35 | { | |
36 | struct sr_resource rbf; | |
37 | unsigned char *stream; | |
38 | ssize_t length, count; | |
39 | ||
40 | if (sr_resource_open(ctx, &rbf, SR_RESOURCE_FIRMWARE, name) != SR_OK) | |
41 | return NULL; | |
42 | ||
43 | if (rbf.size == 0 || rbf.size > BITSTREAM_MAX_SIZE) { | |
44 | sr_err("Refusing to load bitstream of unreasonable size " | |
45 | "(%" PRIu64 " bytes).", rbf.size); | |
46 | sr_resource_close(ctx, &rbf); | |
47 | return NULL; | |
48 | } | |
49 | ||
50 | /* The message length includes the 4-byte header. */ | |
51 | length = BITSTREAM_HEADER_SIZE + rbf.size; | |
52 | stream = g_try_malloc(length); | |
53 | if (!stream) { | |
54 | sr_err("Failed to allocate bitstream buffer."); | |
55 | sr_resource_close(ctx, &rbf); | |
56 | return NULL; | |
57 | } | |
58 | ||
59 | /* Write the message length header. */ | |
60 | *(uint32_t *)stream = GUINT32_TO_BE(length); | |
61 | ||
62 | count = sr_resource_read(ctx, &rbf, stream + BITSTREAM_HEADER_SIZE, | |
63 | length - BITSTREAM_HEADER_SIZE); | |
64 | sr_resource_close(ctx, &rbf); | |
65 | ||
66 | if (count != length - BITSTREAM_HEADER_SIZE) { | |
67 | sr_err("Failed to read bitstream '%s'.", name); | |
68 | g_free(stream); | |
69 | return NULL; | |
70 | } | |
71 | ||
72 | *length_p = length; | |
73 | return stream; | |
74 | } | |
75 | ||
76 | /* Load a Raw Binary File (.rbf) from the firmware directory and transfer | |
77 | * it to the device. | |
78 | */ | |
79 | SR_PRIV int lwla_send_bitstream(struct sr_context *ctx, | |
80 | const struct sr_usb_dev_inst *usb, | |
81 | const char *name) | |
82 | { | |
83 | unsigned char *stream; | |
84 | int ret, length, xfer_len; | |
85 | ||
86 | if (!ctx || !usb || !name) | |
87 | return SR_ERR_BUG; | |
88 | ||
89 | stream = load_bitstream(ctx, name, &length); | |
90 | if (!stream) | |
91 | return SR_ERR; | |
92 | ||
93 | sr_info("Downloading FPGA bitstream '%s'.", name); | |
94 | ||
95 | /* Transfer the entire bitstream in one URB. */ | |
96 | ret = libusb_bulk_transfer(usb->devhdl, EP_CONFIG, | |
97 | stream, length, &xfer_len, USB_TIMEOUT_MS); | |
98 | g_free(stream); | |
99 | ||
100 | if (ret != 0) { | |
101 | sr_err("Failed to transfer bitstream: %s.", | |
102 | libusb_error_name(ret)); | |
103 | return SR_ERR; | |
104 | } | |
105 | if (xfer_len != length) { | |
106 | sr_err("Failed to transfer bitstream: incorrect length " | |
107 | "%d != %d.", xfer_len, length); | |
108 | return SR_ERR; | |
109 | } | |
110 | sr_info("FPGA bitstream download of %d bytes done.", xfer_len); | |
111 | ||
112 | /* This delay appears to be necessary for reliable operation. */ | |
113 | g_usleep(30 * 1000); | |
114 | ||
115 | return SR_OK; | |
116 | } | |
117 | ||
118 | SR_PRIV int lwla_send_command(const struct sr_usb_dev_inst *usb, | |
119 | const uint16_t *command, int cmd_len) | |
120 | { | |
121 | int ret, xfer_len; | |
122 | ||
123 | if (!usb || !command || cmd_len <= 0) | |
124 | return SR_ERR_BUG; | |
125 | ||
126 | xfer_len = 0; | |
127 | ret = libusb_bulk_transfer(usb->devhdl, EP_COMMAND, | |
128 | (unsigned char *)command, cmd_len * 2, | |
129 | &xfer_len, USB_TIMEOUT_MS); | |
130 | if (ret != 0) { | |
131 | sr_dbg("Failed to send command %d: %s.", | |
132 | LWLA_TO_UINT16(command[0]), libusb_error_name(ret)); | |
133 | return SR_ERR; | |
134 | } | |
135 | if (xfer_len != cmd_len * 2) { | |
136 | sr_dbg("Failed to send command %d: incorrect length %d != %d.", | |
137 | LWLA_TO_UINT16(command[0]), xfer_len, cmd_len * 2); | |
138 | return SR_ERR; | |
139 | } | |
140 | ||
141 | return SR_OK; | |
142 | } | |
143 | ||
144 | SR_PRIV int lwla_receive_reply(const struct sr_usb_dev_inst *usb, | |
145 | void *reply, int buf_size, int *xfer_len) | |
146 | { | |
147 | int ret; | |
148 | ||
149 | if (!usb || !reply || buf_size <= 0) | |
150 | return SR_ERR_BUG; | |
151 | ||
152 | ret = libusb_bulk_transfer(usb->devhdl, EP_REPLY, reply, buf_size, | |
153 | xfer_len, USB_TIMEOUT_MS); | |
154 | if (ret != 0) { | |
155 | sr_dbg("Failed to receive reply: %s.", libusb_error_name(ret)); | |
156 | return SR_ERR; | |
157 | } | |
158 | ||
159 | return SR_OK; | |
160 | } | |
161 | ||
162 | SR_PRIV int lwla_read_reg(const struct sr_usb_dev_inst *usb, | |
163 | uint16_t reg, uint32_t *value) | |
164 | { | |
165 | int xfer_len, ret; | |
166 | uint16_t command[2]; | |
167 | uint32_t reply[128]; /* Full EP buffer to avoid overflows. */ | |
168 | ||
169 | command[0] = LWLA_WORD(CMD_READ_REG); | |
170 | command[1] = LWLA_WORD(reg); | |
171 | ||
172 | ret = lwla_send_command(usb, command, ARRAY_SIZE(command)); | |
173 | if (ret != SR_OK) | |
174 | return ret; | |
175 | ||
176 | ret = lwla_receive_reply(usb, reply, sizeof(reply), &xfer_len); | |
177 | if (ret != SR_OK) | |
178 | return ret; | |
179 | ||
180 | if (xfer_len != 4) { | |
181 | sr_dbg("Invalid register read response of length %d.", | |
182 | xfer_len); | |
183 | return SR_ERR; | |
184 | } | |
185 | *value = LWLA_TO_UINT32(reply[0]); | |
186 | ||
187 | return SR_OK; | |
188 | } | |
189 | ||
190 | SR_PRIV int lwla_write_reg(const struct sr_usb_dev_inst *usb, | |
191 | uint16_t reg, uint32_t value) | |
192 | { | |
193 | uint16_t command[4]; | |
194 | ||
195 | command[0] = LWLA_WORD(CMD_WRITE_REG); | |
196 | command[1] = LWLA_WORD(reg); | |
197 | command[2] = LWLA_WORD_0(value); | |
198 | command[3] = LWLA_WORD_1(value); | |
199 | ||
200 | return lwla_send_command(usb, command, ARRAY_SIZE(command)); | |
201 | } | |
202 | ||
203 | SR_PRIV int lwla_write_regs(const struct sr_usb_dev_inst *usb, | |
204 | const struct regval *regvals, int count) | |
205 | { | |
206 | int i, ret; | |
207 | ||
208 | ret = SR_OK; | |
209 | ||
210 | for (i = 0; i < count; i++) { | |
211 | ret = lwla_write_reg(usb, regvals[i].reg, regvals[i].val); | |
212 | ||
213 | if (ret != SR_OK) | |
214 | break; | |
215 | } | |
216 | ||
217 | return ret; | |
218 | } |