Bring up STM32L476G-Eval

This patch adds initial set of files to bring up STM32L476G-Eval board.

BUG=none
BRANCH=tot
TEST=Tested console. make buildall && make tests

Change-Id: I0c0f73f31e84099746fced4214c5ed7f45468cef
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/340100
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

7 files changed, 134 insertions, 0 deletions

diff --git a/board/stm32l476g-eval/Makefile b/board/stm32l476g-eval/Makefile
new file mode 120000
index 0000000000..94aaae2c4d
--- /dev/null
+++ b/board/stm32l476g-eval/Makefile
@@ -0,0 +1 @@
+../../Makefile
\ No newline at end of file
diff --git a/board/stm32l476g-eval/board.c b/board/stm32l476g-eval/board.c
new file mode 100644
index 0000000000..37ff088090
--- /dev/null
+++ b/board/stm32l476g-eval/board.c
@@ -0,0 +1,20 @@
+/* Copyright 2016 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "common.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "registers.h"
+#include "gpio_list.h"
+
+void tick_event(void)
+{
+	static int count;
+
+	gpio_set_level(GPIO_LED_GREEN, (count & 0x03) == 0);
+
+	count++;
+}
+DECLARE_HOOK(HOOK_TICK, tick_event, HOOK_PRIO_DEFAULT);
diff --git a/board/stm32l476g-eval/board.h b/board/stm32l476g-eval/board.h
new file mode 100644
index 0000000000..b4972a63cb
--- /dev/null
+++ b/board/stm32l476g-eval/board.h
@@ -0,0 +1,42 @@
+/* Copyright 2016 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* STM32L476G-Eval board configuration */
+
+#ifndef __CROS_EC_BOARD_H
+#define __CROS_EC_BOARD_H
+
+/* Optional features */
+#undef CONFIG_WATCHDOG_HELP
+#undef CONFIG_LID_SWITCH
+
+/* the UART console is on USART1 (PB6/7) */
+#undef CONFIG_UART_CONSOLE
+#define CONFIG_UART_CONSOLE 1
+
+/* Use USART1 for DMA TX */
+#define CONFIG_UART_TX_DMA_CH STM32_DMAC_USART1_TX
+#define CONFIG_UART_TX_DMA_PH 2
+
+/* Optional features */
+#define CONFIG_STM_HWTIMER32
+
+/*
+ * Allow dangerous commands all the time, since we don't have a write protect
+ * switch.
+ */
+#define CONFIG_SYSTEM_UNLOCKED
+
+#ifndef __ASSEMBLER__
+
+#undef CONFIG_FLASH
+
+/* Timer selection */
+#define TIM_CLOCK32 5
+
+#include "gpio_signal.h"
+
+#endif /* !__ASSEMBLER__ */
+#endif /* __CROS_EC_BOARD_H */
diff --git a/board/stm32l476g-eval/build.mk b/board/stm32l476g-eval/build.mk
new file mode 100644
index 0000000000..23c7cd9d38
--- /dev/null
+++ b/board/stm32l476g-eval/build.mk
@@ -0,0 +1,12 @@
+# -*- makefile -*-
+# Copyright 2016 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# Board specific files build
+
+CHIP:=stm32
+CHIP_FAMILY:=stm32l4
+CHIP_VARIANT:=stm32l476
+
+board-y=board.o
diff --git a/board/stm32l476g-eval/ec.tasklist b/board/stm32l476g-eval/ec.tasklist
new file mode 100644
index 0000000000..0c19123e58
--- /dev/null
+++ b/board/stm32l476g-eval/ec.tasklist
@@ -0,0 +1,21 @@
+/* Copyright 2016 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/**
+ * List of enabled tasks in the priority order
+ *
+ * The first one has the lowest priority.
+ *
+ * For each task, use the macro TASK_ALWAYS(n, r, d, s) for base tasks and
+ * TASK_NOTEST(n, r, d, s) for tasks that can be excluded in test binaries,
+ * where :
+ * 'n' in the name of the task
+ * 'r' in the main routine of the task
+ * 'd' in an opaque parameter passed to the routine at startup
+ * 's' is the stack size in bytes; must be a multiple of 8
+ */
+#define CONFIG_TASK_LIST \
+	TASK_ALWAYS(HOOKS, hook_task, NULL, TASK_STACK_SIZE) \
+	TASK_ALWAYS(CONSOLE, console_task, NULL, TASK_STACK_SIZE)
diff --git a/board/stm32l476g-eval/gpio.inc b/board/stm32l476g-eval/gpio.inc
new file mode 100644
index 0000000000..3028956ad4
--- /dev/null
+++ b/board/stm32l476g-eval/gpio.inc
@@ -0,0 +1,19 @@
+/* -*- mode:c -*-
+ *
+ * Copyright 2016 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Declare symbolic names for all the GPIOs that we care about.
+ * Note: Those with interrupt handlers must be declared first. */
+
+/* Outputs */
+GPIO(LED_GREEN,   PIN(B, 2), GPIO_OUT_LOW)
+GPIO(LED_RED,    PIN(C, 1), GPIO_OUT_LOW)
+
+/* Unimplemented signals which we need to emulate for now */
+UNIMPLEMENTED(ENTERING_RW)
+UNIMPLEMENTED(WP_L)
+
+ALTERNATE(PIN_MASK(B, 0xC0), GPIO_ALT_F7, MODULE_UART,  0) /* USART1: PB6/7 */
diff --git a/board/stm32l476g-eval/openocd-flash.cfg b/board/stm32l476g-eval/openocd-flash.cfg
new file mode 100644
index 0000000000..a347f88b79
--- /dev/null
+++ b/board/stm32l476g-eval/openocd-flash.cfg
@@ -0,0 +1,19 @@
+# Copyright 2016 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source [find board/stm32l4discovery.cfg]
+
+# For flashing, force the board into reset on connect, this ensures that
+# code running on the core can't interfere with programming.
+reset_config connect_assert_srst
+
+gdb_port 0
+tcl_port 0
+telnet_port 0
+init
+reset init
+flash write_image erase $BUILD_DIR/ec.bin 0x08000000
+reset halt
+resume
+shutdown