1 files changed, 56 insertions, 0 deletions
diff --git a/meta-facebook/meta-wedge/recipes-wedge/fbutils/files/us_monitor.sh b/meta-facebook/meta-wedge/recipes-wedge/fbutils/files/us_monitor.sh
new file mode 100644
index 0000000..b7a9cb6
--- /dev/null
+++ b/meta-facebook/meta-wedge/recipes-wedge/fbutils/files/us_monitor.sh
@@ -0,0 +1,56 @@
+#!/bin/bash
+#
+# Copyright 2015-present Facebook. All Rights Reserved.
+#
+# This program file 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; version 2 of the License.
+#
+# 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 in a file named COPYING; if not, write to the
+# Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301 USA
+
+. /usr/local/bin/openbmc-utils.sh
+
+PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin
+
+# Because the voltage leak from uS COM pins could cause uS to struck when
+# transitting from S5 to S0, we will need to explicitely pull down uS COM
+# pins before powering off/reset and restoring COM pins after
+
+pull_down_us_com() {
+    # set GPIOL6 and GPIOL7 low
+    devmem_clear_bit $(scu_addr 84) 22
+    devmem_clear_bit $(scu_addr 84) 23
+    gpio_set 94 0
+    gpio_set 95 0
+    # now, connect uart from BMC to the uS
+    gpio_set 32 1
+}
+
+restore_us_com() {
+    devmem_set_bit $(scu_addr 84) 22
+    devmem_set_bit $(scu_addr 84) 23
+    # if sol.sh is running, keep uart from uS connected with BMC
+    if pidof -x sol.sh > /dev/null 2>&1; then
+        gpio_set 32 1
+    else
+        gpio_set 32 0
+    fi
+}
+
+while true; do
+    if ! wedge_is_us_on 1 '' 0 > /dev/null 2>&1; then
+        pull_down_us_com
+    else
+        restore_us_com
+    fi
+    usleep 400000               # 400ms
+done