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-rw-r--r--usrp/host/lib/fusb_ra_wb.cc258
1 files changed, 258 insertions, 0 deletions
diff --git a/usrp/host/lib/fusb_ra_wb.cc b/usrp/host/lib/fusb_ra_wb.cc
new file mode 100644
index 000000000..c95f4afbe
--- /dev/null
+++ b/usrp/host/lib/fusb_ra_wb.cc
@@ -0,0 +1,258 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2003,2006 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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 2, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <fusb_ra_wb.h>
+#include <usb.h>
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+
+#include <sys/event.h>
+#include <dev/usb/usb.h>
+
+static const int USB_TIMEOUT = 1000; // in milliseconds
+
+// the following comment and function is from fusb_linux.cc
+#if 0
+// Totally evil and fragile extraction of file descriptor from
+// guts of libusb. They don't install usbi.h, which is what we'd need
+// to do this nicely.
+//
+// FIXME if everything breaks someday in the future, look here...
+
+static int
+fd_from_usb_dev_handle (usb_dev_handle *udh)
+{
+ return *((int *) udh);
+}
+#endif
+
+// the control endpoint doesn't actually do us any good so here is a
+// new "fragile extraction"
+static int
+ep_fd_from_usb_dev_handle (usb_dev_handle *udh, int endpoint)
+{
+ struct usb_dev_handle_kludge2 { // see also usrp_prims.cc
+ int fd;
+ struct usb_bus *bus;
+ struct usb_device *device;
+ int config;
+ int interface;
+ int altsetting;
+ void *impl_info;
+ };
+ struct bsd_usb_dev_handle_info_kludge {
+ int ep_fd[USB_MAX_ENDPOINTS];
+ };
+ struct bsd_usb_dev_handle_info_kludge *info
+ = (struct bsd_usb_dev_handle_info_kludge *)
+ ((struct usb_dev_handle_kludge2 *)udh)->impl_info;
+ return info->ep_fd[UE_GET_ADDR(endpoint)];
+}
+
+
+fusb_devhandle_ra_wb::fusb_devhandle_ra_wb (usb_dev_handle *udh)
+ : fusb_devhandle (udh)
+{
+ // that's it
+}
+
+fusb_devhandle_ra_wb::~fusb_devhandle_ra_wb ()
+{
+ // nop
+}
+
+fusb_ephandle *
+fusb_devhandle_ra_wb::make_ephandle (int endpoint, bool input_p,
+ int block_size, int nblocks)
+{
+ return new fusb_ephandle_ra_wb (this, endpoint, input_p,
+ block_size, nblocks);
+}
+
+// ----------------------------------------------------------------
+
+fusb_ephandle_ra_wb::fusb_ephandle_ra_wb (fusb_devhandle_ra_wb *dh,
+ int endpoint, bool input_p,
+ int block_size, int nblocks)
+ : fusb_ephandle (endpoint, input_p, block_size, nblocks),
+ d_devhandle (dh), d_ra_wb_on (false)
+{
+ // that's it
+}
+
+fusb_ephandle_ra_wb::~fusb_ephandle_ra_wb ()
+{
+ // nop
+}
+
+bool
+fusb_ephandle_ra_wb::start ()
+{
+ d_started = true;
+
+ char buf = '\0';
+ int fd;
+
+ // this is to cause libusb to open the endpoint
+ if (!d_input_p) {
+ write(&buf, 0);
+ fd = ep_fd_from_usb_dev_handle (d_devhandle->get_usb_dev_handle(),
+ d_endpoint);
+ }
+ else {
+ read(&buf, 0);
+ fd = ep_fd_from_usb_dev_handle (d_devhandle->get_usb_dev_handle(),
+ d_endpoint|USB_ENDPOINT_IN);
+ }
+
+ // enable read ahead/write behind
+ int ret;
+ struct usb_bulk_ra_wb_opt opts;
+ int enable = 1;
+
+ opts.ra_wb_buffer_size = d_block_size*d_nblocks;
+ opts.ra_wb_request_size = d_block_size;
+// fprintf (stderr, "setting buffer size to %d, request size to %d\n",
+// opts.ra_wb_buffer_size, opts.ra_wb_request_size);
+ if (!d_input_p) {
+ ret = ioctl (fd, USB_SET_BULK_WB_OPT, &opts);
+ if (ret < 0)
+ fprintf (stderr, "USB_SET_BULK_WB_OPT: %s\n", strerror(errno));
+ else {
+ ret = ioctl (fd, USB_SET_BULK_WB, &enable);
+ if (ret < 0)
+ fprintf (stderr, "USB_SET_BULK_WB: %s\n", strerror(errno));
+ else
+ d_ra_wb_on = true;
+ }
+ }
+ else {
+ ret = ioctl (fd, USB_SET_BULK_RA_OPT, &opts);
+ if (ret < 0)
+ fprintf (stderr, "USB_SET_BULK_RA_OPT: %s\n", strerror(errno));
+ else {
+ ret = ioctl (fd, USB_SET_BULK_RA, &enable);
+ if (ret < 0)
+ fprintf (stderr, "USB_SET_BULK_RA: %s\n", strerror(errno));
+ else
+ d_ra_wb_on = true;
+ }
+ }
+
+ return true;
+}
+
+bool
+fusb_ephandle_ra_wb::stop ()
+{
+ int fd;
+ int ret;
+ int enable = 0;
+ if (d_ra_wb_on) {
+ if (!d_input_p) {
+ fd = ep_fd_from_usb_dev_handle (d_devhandle->get_usb_dev_handle(),
+ d_endpoint);
+ ret = ioctl (fd, USB_SET_BULK_WB, &enable);
+ if (ret < 0)
+ fprintf (stderr, "USB_SET_BULK_WB: %s\n", strerror(errno));
+ else
+ d_ra_wb_on = false;
+ }
+ else {
+ fd = ep_fd_from_usb_dev_handle (d_devhandle->get_usb_dev_handle(),
+ d_endpoint|USB_ENDPOINT_IN);
+ ret = ioctl (fd, USB_SET_BULK_RA, &enable);
+ if (ret < 0)
+ fprintf (stderr, "USB_SET_BULK_RA: %s\n", strerror(errno));
+ else
+ d_ra_wb_on = false;
+ }
+ }
+
+ d_started = false;
+ return true;
+}
+
+int
+fusb_ephandle_ra_wb::write (const void *buffer, int nbytes)
+{
+ if (!d_started)
+ return -1;
+
+ if (d_input_p)
+ return -1;
+
+ return usb_bulk_write (d_devhandle->get_usb_dev_handle (),
+ d_endpoint, (char *) buffer, nbytes, USB_TIMEOUT);
+}
+
+int
+fusb_ephandle_ra_wb::read (void *buffer, int nbytes)
+{
+ if (!d_started)
+ return -1;
+
+ if (!d_input_p)
+ return -1;
+
+ return usb_bulk_read (d_devhandle->get_usb_dev_handle (),
+ d_endpoint|USB_ENDPOINT_IN, (char *) buffer, nbytes,
+ USB_TIMEOUT);
+}
+
+void
+fusb_ephandle_ra_wb::wait_for_completion ()
+{
+ // as the driver is implemented this only makes sense for write
+ if (d_ra_wb_on && !d_input_p) {
+ int fd = ep_fd_from_usb_dev_handle (d_devhandle->get_usb_dev_handle(),
+ d_endpoint);
+ int kq = kqueue();
+ if (kq < 0)
+ return;
+ struct kevent evt;
+ int nevents;
+ EV_SET (&evt, fd, EVFILT_WRITE, EV_ADD | EV_ENABLE, 0, 0, 0/*NULL*/);
+ nevents = kevent (kq, &evt, 1, &evt, 1, NULL);
+ if (nevents < 1) {
+ close(kq);
+ return;
+ }
+ while (!(evt.flags & EV_ERROR) && evt.data < (d_block_size*d_nblocks)) {
+ // it's a busy loop, but that's all I can do at the moment
+ nevents = kevent (kq, NULL, 0, &evt, 1, NULL);
+ // let's see if this improves the test_usrp_standard_tx throughput &
+ // "CPU usage" by looping less frequently
+ struct timeval timeout;
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 1000; // 1 ms
+ select (0, NULL, NULL, NULL, &timeout);
+ }
+ close (kq);
+ }
+}
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