basic support for STM32L-Discovery board

Support for the basic development board built by STmicro with STM32L152
chip.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BUG=none
TEST=See that LEDs can be driven from the console, button can be read.  With
additional print statement, see that button hook is called.
BRANCH=none

Change-Id: I494ab525f17e08b57595ee49489ade63b3305f2a
Reviewed-on: https://chromium-review.googlesource.com/170920
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Jeremy Thorpe <jeremyt@chromium.org>
Tested-by: Jeremy Thorpe <jeremyt@chromium.org>

4 files changed, 129 insertions, 0 deletions

diff --git a/board/discovery/board.c b/board/discovery/board.c
new file mode 100644
index 0000000000..f900acf015
--- /dev/null
+++ b/board/discovery/board.c
@@ -0,0 +1,43 @@
+/* Copyright (c) 2013 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.
+ */
+/* STM32L-discovery board configuration */
+
+#include "common.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "registers.h"
+#include "task.h"
+#include "util.h"
+
+void button_event(enum gpio_signal signal)
+{
+}
+
+/* GPIO signal list.  Must match order from enum gpio_signal. */
+const struct gpio_info gpio_list[] = {
+	/* Inputs with interrupt handlers are first for efficiency */
+	{"USER_BUTTON", GPIO_A, (1<<0),  GPIO_INT_BOTH, button_event},
+	/* Outputs */
+	{"LED_BLUE",    GPIO_B, (1<<6),  GPIO_OUT_LOW, NULL},
+	{"LED_GREEN",   GPIO_B, (1<<7),  GPIO_OUT_LOW, NULL},
+
+	/* Unimplemented signals which we need to emulate for now */
+	GPIO_SIGNAL_NOT_IMPLEMENTED("ENTERING_RW"),
+	GPIO_SIGNAL_NOT_IMPLEMENTED("WP_L"),
+};
+BUILD_ASSERT(ARRAY_SIZE(gpio_list) == GPIO_COUNT);
+
+/* Initialize board. */
+static void board_init(void)
+{
+	gpio_enable_interrupt(GPIO_USER_BUTTON);
+}
+DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT);
+
+/* Pins with alternate functions */
+const struct gpio_alt_func gpio_alt_funcs[] = {
+	{GPIO_A, 0x0600, GPIO_ALT_USART, MODULE_UART},
+};
+const int gpio_alt_funcs_count = ARRAY_SIZE(gpio_alt_funcs);
diff --git a/board/discovery/board.h b/board/discovery/board.h
new file mode 100644
index 0000000000..541568dd00
--- /dev/null
+++ b/board/discovery/board.h
@@ -0,0 +1,52 @@
+/* Copyright (c) 2013 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.
+ */
+
+/* STM32L-discovery board configuration */
+
+#ifndef __BOARD_H
+#define __BOARD_H
+
+/* Optional features */
+#undef  CONFIG_WATCHDOG_HELP
+#undef CONFIG_LID_SWITCH
+
+/*
+ * Allow dangerous commands all the time, since we don't have a write protect
+ * switch.
+ */
+#define CONFIG_SYSTEM_UNLOCKED
+
+#ifndef __ASSEMBLER__
+
+/* Module IDs */
+enum module_id {
+	MODULE_UART,
+	MODULE_CHIPSET,
+};
+
+/* By default, enable all console messages except keyboard */
+#define CC_DEFAULT	(CC_ALL & ~CC_MASK(CC_KEYSCAN))
+
+/* Timer selection */
+#define TIM_CLOCK_MSB 3
+#define TIM_CLOCK_LSB 4
+
+/* GPIO signal list */
+enum gpio_signal {
+	/* Inputs with interrupt handlers are first for efficiency */
+	GPIO_USER_BUTTON = 0,
+	/* Outputs */
+	GPIO_LED_BLUE,
+	GPIO_LED_GREEN,
+	/* Unimplemented signals we emulate */
+	GPIO_ENTERING_RW,
+	GPIO_WP_L,
+	/* Number of GPIOs; not an actual GPIO */
+	GPIO_COUNT
+};
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* __BOARD_H */
diff --git a/board/discovery/build.mk b/board/discovery/build.mk
new file mode 100644
index 0000000000..8de1b957d3
--- /dev/null
+++ b/board/discovery/build.mk
@@ -0,0 +1,13 @@
+# -*- makefile -*-
+# Copyright (c) 2013 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
+
+# the IC is STmicro STM32L151R8H6
+CHIP:=stm32
+CHIP_FAMILY:=stm32l
+CHIP_VARIANT:=stm32l15x
+
+board-y=board.o
diff --git a/board/discovery/ec.tasklist b/board/discovery/ec.tasklist
new file mode 100644
index 0000000000..d3ac489b42
--- /dev/null
+++ b/board/discovery/ec.tasklist
@@ -0,0 +1,21 @@
+/* Copyright (c) 2013 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)