discovery-stm32f072: Initial working version

This version of the EC firmware just provides a console and some
blinking lights for the stm32f0 discovery board.  This is a
convenient board to work with for peripheral bringup.

Signed-off-by: Anton Staaf <robotboy@chromium.org>

BRANCH=none
TEST=make buildall -j

Change-Id: I9ae87235e8a505d58fa7a5c996528c4dd6c3f2ac
Reviewed-on: https://chromium-review.googlesource.com/207130
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Queue: Anton Staaf <robotboy@chromium.org>
Tested-by: Anton Staaf <robotboy@chromium.org>

board/discovery-stm32f072/Makefile

@@ -0,0 +1,20 @@
+# Copyright (c) 2014 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.
+
+#
+# Simple flashing command to reflash the discovery board using openocd
+#
+.PHONY: flash
+
+flash:
+	sudo openocd -f board/stm32f0discovery.cfg \
+		-c "gdb_port 0" \
+		-c "tcl_port 0" \
+		-c "telnet_port 0" \
+		-c "init" \
+		-c "reset init" \
+		-c "flash write_image erase ../../build/discovery-stm32f072/ec.bin 0x08000000" \
+		-c "reset halt" \
+		-c "resume" \
+		-c "shutdown"

board/discovery-stm32f072/board.c

@@ -0,0 +1,41 @@
+/* Copyright (c) 2014 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.
+ */
+/* STM32F072-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);
+
+#include "gpio_list.h"
+
+void button_event(enum gpio_signal signal)
+{
+	static int count = 0;
+
+	gpio_set_level(GPIO_LED_U, (count & 0x03) == 0);
+	gpio_set_level(GPIO_LED_R, (count & 0x03) == 1);
+	gpio_set_level(GPIO_LED_D, (count & 0x03) == 2);
+	gpio_set_level(GPIO_LED_L, (count & 0x03) == 3);
+
+	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, 0xC000, 1, MODULE_UART}, /* USART2: PA14/PA15 */
+};
+const int gpio_alt_funcs_count = ARRAY_SIZE(gpio_alt_funcs);

board/discovery-stm32f072/board.h

@@ -0,0 +1,40 @@
+/* Copyright (c) 2014 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.
+ */
+
+/* STM32F072-discovery board configuration */
+
+#ifndef __BOARD_H
+#define __BOARD_H
+
+/* 48 MHz SYSCLK clock frequency */
+#define CPU_CLOCK 48000000
+
+/* the UART console is on USART2 (PA14/PA15) */
+#undef CONFIG_UART_CONSOLE
+#define CONFIG_UART_CONSOLE 2
+
+/* Optional features */
+#define CONFIG_STM_HWTIMER32
+#define CONFIG_HW_CRC
+
+#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__
+
+/* Timer selection */
+#define TIM_CLOCK32 2
+
+#include "gpio_signal.h"
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* __BOARD_H */

board/discovery-stm32f072/build.mk

@@ -0,0 +1,13 @@
+# -*- makefile -*-
+# Copyright (c) 2014 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 STM32F072RBT6
+CHIP:=stm32
+CHIP_FAMILY:=stm32f0
+CHIP_VARIANT:=stm32f07x
+
+board-y=board.o

board/discovery-stm32f072/ec.tasklist

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+/* Copyright (c) 2014 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)

board/discovery-stm32f072/gpio.inc

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+/* -*- mode:c -*-
+ *
+ * Copyright (c) 2014 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.
+ */
+
+/* Inputs with interrupt handlers are first for efficiency */
+GPIO(USER_BUTTON, A, 0, GPIO_INT_FALLING, button_event)
+
+/* Outputs */
+GPIO(LED_U, C, 6, GPIO_OUT_LOW, NULL)
+GPIO(LED_D, C, 7, GPIO_OUT_LOW, NULL)
+GPIO(LED_L, C, 8, GPIO_OUT_LOW, NULL)
+GPIO(LED_R, C, 9, GPIO_OUT_LOW, NULL)
+
+/* Unimplemented signals which we need to emulate for now */
+UNIMPLEMENTED(ENTERING_RW)
+UNIMPLEMENTED(WP_L)