serial: Add Darwin/macOS support for custom and >230400 baudrates
This change is based on the patch proposed by Denis Ahrens in
https://review.coreboot.org/c/flashrom/+/67822
Change-Id: I3e6b88d2b4c2a130b16456752681fd9f807bf6f0
Signed-off-by: Peter Stuge <peter@stuge.se>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/70571
Original-Reviewed-by: Thomas Heijligen <src@posteo.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/73480
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/Makefile b/Makefile
index 95aeae6..dde09a5 100644
--- a/Makefile
+++ b/Makefile
@@ -796,9 +796,13 @@
ifeq ($(TARGET_OS), Linux)
LIB_OBJS += custom_baud_linux.o
else
+ifeq ($(TARGET_OS), Darwin)
+LIB_OBJS += custom_baud_darwin.o
+else
LIB_OBJS += custom_baud.o
endif
endif
+endif
USE_SOCKETS := $(if $(call filter_deps,$(DEPENDS_ON_SOCKETS)),yes,no)
ifeq ($(USE_SOCKETS), yes)
diff --git a/custom_baud_darwin.c b/custom_baud_darwin.c
new file mode 100644
index 0000000..e8764dd
--- /dev/null
+++ b/custom_baud_darwin.c
@@ -0,0 +1,61 @@
+/*
+ * This file is part of the flashrom project.
+ *
+ * Copyright (C) 2022 Peter Stuge <peter@stuge.se>
+ *
+ * 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 2 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.
+ */
+
+#include <termios.h>
+#include <sys/ioctl.h>
+#include <IOKit/serial/ioss.h>
+#include <errno.h>
+
+#include "custom_baud.h"
+
+int use_custom_baud(unsigned int baud, const struct baudentry *baudtable)
+{
+ int i;
+
+ if (baud > 230400)
+ return 1;
+
+ for (i = 0; baudtable[i].baud; i++) {
+ if (baudtable[i].baud == baud)
+ return 0;
+
+ if (baudtable[i].baud > baud)
+ return 1;
+ }
+
+ return 1;
+}
+
+int set_custom_baudrate(int fd, unsigned int baud, const enum custom_baud_stage stage, void *tio_wanted)
+{
+ struct termios *wanted;
+ speed_t speed;
+
+ switch (stage) {
+ case BEFORE_FLAGS:
+ break;
+
+ case WITH_FLAGS:
+ wanted = tio_wanted;
+ return cfsetspeed(wanted, B19200);
+
+ case AFTER_FLAGS:
+ speed = baud;
+ return ioctl(fd, IOSSIOSPEED, &speed);
+ }
+
+ return 0;
+}
diff --git a/meson.build b/meson.build
index 7a91300..fa08c93 100644
--- a/meson.build
+++ b/meson.build
@@ -100,6 +100,8 @@
if host_machine.system() == 'linux'
custom_baud_c = 'custom_baud_linux.c'
+elif host_machine.system() == 'darwin'
+ custom_baud_c = 'custom_baud_darwin.c'
else
custom_baud_c = 'custom_baud.c'
endif
diff --git a/serial.c b/serial.c
index cfc9b1e..d3a7e93 100644
--- a/serial.c
+++ b/serial.c
@@ -47,6 +47,10 @@
* On Linux there is a non-standard way to use arbitrary baud rates that we use if there is no
* matching standard rate, see custom_baud.c
*
+ * On Darwin there is also a non-standard ioctl() to set arbitrary baud rates
+ * and any above 230400, see custom_baud_darwin.c and
+ * https://opensource.apple.com/source/IOSerialFamily/IOSerialFamily-91/tests/IOSerialTestLib.c.auto.html
+ *
* On Windows there exist similar macros (starting with CBR_ instead of B) but they are only defined for
* backwards compatibility and the API supports arbitrary baud rates in the same manner as the macros, see
* http://msdn.microsoft.com/en-us/library/windows/desktop/aa363214(v=vs.85).aspx