usrp2: implemented packet ctrl to read and write slow path packets from the new interface

1 files changed, 54 insertions, 0 deletions

diff --git a/firmware/microblaze/lib/pkt_ctrl.c b/firmware/microblaze/lib/pkt_ctrl.c
new file mode 100644
index 000000000..235a09459
--- /dev/null
+++ b/firmware/microblaze/lib/pkt_ctrl.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2010 Ettus Research LLC
+ *
+ * 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 "pkt_ctrl.h"
+#include "memory_map.h"
+#include <stdint.h>
+#include <stdbool.h>
+#include <nonstdio.h>
+
+static void set_control(uint32_t value, uint32_t mask){
+    static uint32_t ctrl_shadow = 0;
+
+    ctrl_shadow &= ~mask;
+    ctrl_shadow |= value & mask;
+
+    buffer_pool_ctrl->ctrl = ctrl_shadow;
+}
+
+void *claim_incoming_buffer(size_t *num_lines){
+    if ((buffer_pool_status->status & 0x1) != 1) return NULL;
+    *num_lines = (buffer_pool_status->status >> 16) & 0xffff;
+    set_control(0x1, 0x1);
+    return buffer_ram(0);
+}
+
+void release_incoming_buffer(void){
+    set_control(0x0, 0x1);
+    while ((buffer_pool_status->status & 0x1) != 0){}
+}
+
+void *claim_outgoing_buffer(void){
+    while ((buffer_pool_status->status & 0x2) != 0x2){}
+    return buffer_ram(1);
+}
+
+void commit_outgoing_buffer(size_t num_lines){
+    set_control(0x2 | (num_lines << 16), 0x2 | (0xffff << 16));
+    while ((buffer_pool_status->status & 0x2) != 0x0){}
+    set_control(0x0, 0x2);
+}