--- /dev/null
+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2014 Daniel Elstner <daniel.kitta@gmail.com>
+ *
+ * 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/>.
+ */
+
+#include "lwla.h"
+#include "protocol.h"
+#include "libsigrok-internal.h"
+#include <errno.h>
+#include <glib/gstdio.h>
+
+#define BITSTREAM_MAX_SIZE 262144 /* bitstream size limit for safety */
+#define BITSTREAM_HEADER_SIZE 4 /* transfer header size in bytes */
+
+/* Load a bitstream file into memory. Returns a newly allocated array
+ * consisting of a 32-bit length field followed by the bitstream data.
+ */
+static unsigned char *load_bitstream_file(const char *filename, int *length_p)
+{
+ GStatBuf statbuf;
+ FILE *file;
+ unsigned char *stream;
+ size_t length, count;
+
+ /* Retrieve and validate the file size. */
+ if (g_stat(filename, &statbuf) < 0) {
+ sr_err("Failed to access bitstream file: %s.",
+ g_strerror(errno));
+ return NULL;
+ }
+ if (!S_ISREG(statbuf.st_mode)) {
+ sr_err("Bitstream is not a regular file.");
+ return NULL;
+ }
+ if (statbuf.st_size <= 0 || statbuf.st_size > BITSTREAM_MAX_SIZE) {
+ sr_err("Refusing to load bitstream of unreasonable size "
+ "(%" PRIu64 " bytes).", (uint64_t)statbuf.st_size);
+ return NULL;
+ }
+
+ /* The message length includes the 4-byte header. */
+ length = BITSTREAM_HEADER_SIZE + statbuf.st_size;
+ stream = g_try_malloc(length);
+ if (!stream) {
+ sr_err("Failed to allocate bitstream buffer.");
+ return NULL;
+ }
+
+ file = g_fopen(filename, "rb");
+ if (!file) {
+ sr_err("Failed to open bitstream file: %s.", g_strerror(errno));
+ g_free(stream);
+ return NULL;
+ }
+
+ /* Write the message length header. */
+ *(uint32_t *)stream = GUINT32_TO_BE(length);
+
+ count = fread(stream + BITSTREAM_HEADER_SIZE,
+ length - BITSTREAM_HEADER_SIZE, 1, file);
+ if (count != 1) {
+ sr_err("Failed to read bitstream file: %s.", g_strerror(errno));
+ fclose(file);
+ g_free(stream);
+ return NULL;
+ }
+ fclose(file);
+
+ *length_p = length;
+ return stream;
+}
+
+/* Load a Raw Binary File (.rbf) from the firmware directory and transfer
+ * it to the device.
+ */
+SR_PRIV int lwla_send_bitstream(const struct sr_usb_dev_inst *usb,
+ const char *basename)
+{
+ char *filename;
+ unsigned char *stream;
+ int ret;
+ int length;
+ int xfer_len;
+
+ if (!usb || !basename)
+ return SR_ERR_BUG;
+
+ filename = g_build_filename(FIRMWARE_DIR, basename, NULL);
+ sr_info("Downloading FPGA bitstream at '%s'.", filename);
+
+ stream = load_bitstream_file(filename, &length);
+ g_free(filename);
+
+ if (!stream)
+ return SR_ERR;
+
+ /* Transfer the entire bitstream in one URB. */
+ ret = libusb_bulk_transfer(usb->devhdl, EP_BITSTREAM,
+ stream, length, &xfer_len, USB_TIMEOUT);
+ g_free(stream);
+
+ if (ret != 0) {
+ sr_err("Failed to transfer bitstream: %s.",
+ libusb_error_name(ret));
+ return SR_ERR;
+ }
+ if (xfer_len != length) {
+ sr_err("Failed to transfer bitstream: incorrect length "
+ "%d != %d.", xfer_len, length);
+ return SR_ERR;
+ }
+ sr_info("FPGA bitstream download of %d bytes done.", xfer_len);
+
+ /* This delay appears to be necessary for reliable operation. */
+ g_usleep(30000);
+
+ return SR_OK;
+}
+
+SR_PRIV int lwla_send_command(const struct sr_usb_dev_inst *usb,
+ const uint16_t *command, int cmd_len)
+{
+ int ret;
+ int xfer_len;
+
+ if (!usb || !command || cmd_len <= 0)
+ return SR_ERR_BUG;
+
+ xfer_len = 0;
+ ret = libusb_bulk_transfer(usb->devhdl, EP_COMMAND,
+ (unsigned char *)command, cmd_len * 2,
+ &xfer_len, USB_TIMEOUT);
+ if (ret != 0) {
+ sr_dbg("Failed to send command %d: %s.",
+ LWLA_TO_UINT16(command[0]), libusb_error_name(ret));
+ return SR_ERR;
+ }
+ if (xfer_len != cmd_len * 2) {
+ sr_dbg("Failed to send command %d: incorrect length %d != %d.",
+ LWLA_TO_UINT16(command[0]), xfer_len, cmd_len * 2);
+ return SR_ERR;
+ }
+ return SR_OK;
+}
+
+SR_PRIV int lwla_receive_reply(const struct sr_usb_dev_inst *usb,
+ uint32_t *reply, int reply_len, int expect_len)
+{
+ int ret;
+ int xfer_len;
+
+ if (!usb || !reply || reply_len <= 0)
+ return SR_ERR_BUG;
+
+ xfer_len = 0;
+ ret = libusb_bulk_transfer(usb->devhdl, EP_REPLY,
+ (unsigned char *)reply, reply_len * 4,
+ &xfer_len, USB_TIMEOUT);
+ if (ret != 0) {
+ sr_dbg("Failed to receive reply: %s.", libusb_error_name(ret));
+ return SR_ERR;
+ }
+ if (xfer_len != expect_len * 4) {
+ sr_dbg("Failed to receive reply: incorrect length %d != %d.",
+ xfer_len, expect_len * 4);
+ return SR_ERR;
+ }
+ return SR_OK;
+}
+
+SR_PRIV int lwla_read_reg(const struct sr_usb_dev_inst *usb,
+ uint16_t reg, uint32_t *value)
+{
+ int ret;
+ uint16_t command[2];
+ uint32_t reply[128]; /* full EP buffer to avoid overflows */
+
+ command[0] = LWLA_WORD(CMD_READ_REG);
+ command[1] = LWLA_WORD(reg);
+
+ ret = lwla_send_command(usb, command, G_N_ELEMENTS(command));
+
+ if (ret != SR_OK)
+ return ret;
+
+ ret = lwla_receive_reply(usb, reply, G_N_ELEMENTS(reply), 1);
+
+ if (ret == SR_OK)
+ *value = LWLA_TO_UINT32(reply[0]);
+
+ return ret;
+}
+
+SR_PRIV int lwla_write_reg(const struct sr_usb_dev_inst *usb,
+ uint16_t reg, uint32_t value)
+{
+ uint16_t command[4];
+
+ command[0] = LWLA_WORD(CMD_WRITE_REG);
+ command[1] = LWLA_WORD(reg);
+ command[2] = LWLA_WORD_0(value);
+ command[3] = LWLA_WORD_1(value);
+
+ return lwla_send_command(usb, command, G_N_ELEMENTS(command));
+}
+
+SR_PRIV int lwla_write_regs(const struct sr_usb_dev_inst *usb,
+ const struct regval_pair *regvals, int count)
+{
+ int i;
+ int ret;
+
+ ret = SR_OK;
+
+ for (i = 0; i < count; ++i) {
+ ret = lwla_write_reg(usb, regvals[i].reg, regvals[i].val);
+
+ if (ret != SR_OK)
+ break;
+ }
+
+ return ret;
+}
projects / libsigrok.git / blobdiff