stm32l4: add gpio support

Just the basic core common functionality gained for free by being a common
peripheral.  Enough for a miniblink.

Fixes some errors in the GPIO memory map.  ST's naming of AHB2 vs AHB3 is
confusing.

doc/stm32l4/Doxyfile

@@ -19,10 +19,15 @@ INPUT		= ../../include/libopencm3/license.dox
 INPUT		+=../../include/libopencm3/stm32/l4
 #INPUT		+=../../include/libopencm3/stm32/common
 INPUT		+=../../include/libopencm3/stm32/common/rcc_common_all.h
+INPUT		+=../../include/libopencm3/stm32/common/gpio_common_all.h
+INPUT		+=../../include/libopencm3/stm32/common/gpio_common_f234.h
+INPUT		+=../../include/libopencm3/stm32/common/gpio_common_f24.h
 
 INPUT		+=../../lib/stm32/l4
 #INPUT		+=../../lib/stm32/common
 INPUT		+=../../lib/stm32/common/rcc_common_all.c
+INPUT		+=../../lib/stm32/common/gpio_common_all.c
+INPUT		+=../../lib/stm32/common/gpio_common_f0234.c
 
 # No headers to exclude until we include some!
 EXCLUDE		=

include/libopencm3/stm32/gpio.h

@@ -36,6 +36,8 @@
 #       include <libopencm3/stm32/l0/gpio.h>
 #elif defined(STM32L1)
 #       include <libopencm3/stm32/l1/gpio.h>
+#elif defined(STM32L4)
+#       include <libopencm3/stm32/l4/gpio.h>
 #else
 #       error "stm32 family not defined."
 #endif

include/libopencm3/stm32/l4/gpio.h

@@ -0,0 +1,89 @@
+/** @defgroup gpio_defines GPIO Defines
+ *
+ * @brief <b>Defined Constants and Types for the STM32L4xx General Purpose I/O</b>
+ *
+ * @ingroup STM32L4xx_defines
+ *
+ * @version 1.0.0
+ *
+ * @date 12 November 2015
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LIBOPENCM3_GPIO_H
+#define LIBOPENCM3_GPIO_H
+
+#include <libopencm3/stm32/common/gpio_common_f24.h>
+
+/*****************************************************************************/
+/* Module definitions                                                        */
+/*****************************************************************************/
+
+/*****************************************************************************/
+/* Register definitions                                                      */
+/*****************************************************************************/
+
+#define GPIO_BRR(port)			MMIO32((port) + 0x28)
+#define GPIOA_BRR			GPIO_BRR(GPIOA)
+#define GPIOB_BRR			GPIO_BRR(GPIOB)
+#define GPIOC_BRR			GPIO_BRR(GPIOC)
+#define GPIOD_BRR			GPIO_BRR(GPIOD)
+#define GPIOE_BRR			GPIO_BRR(GPIOE)
+#define GPIOF_BRR			GPIO_BRR(GPIOF)
+#define GPIOG_BRR			GPIO_BRR(GPIOG)
+#define GPIOH_BRR			GPIO_BRR(GPIOH)
+
+#define GPIO_ASC(port)			MMIO32((port) + 0x2c)
+#define GPIOA_ASC			GPIO_ASC(GPIOA)
+#define GPIOB_ASC			GPIO_ASC(GPIOB)
+#define GPIOC_ASC			GPIO_ASC(GPIOC)
+#define GPIOD_ASC			GPIO_ASC(GPIOD)
+#define GPIOE_ASC			GPIO_ASC(GPIOE)
+#define GPIOF_ASC			GPIO_ASC(GPIOF)
+#define GPIOG_ASC			GPIO_ASC(GPIOG)
+#define GPIOH_ASC			GPIO_ASC(GPIOH)
+
+/*****************************************************************************/
+/* Register values                                                           */
+/*****************************************************************************/
+
+/** @defgroup gpio_speed GPIO Output Pin Speed
+@ingroup gpio_defines
+@{*/
+#define GPIO_OSPEED_LOW		0x0
+#define GPIO_OSPEED_MED		0x1
+#define GPIO_OSPEED_FAST	0x2
+#define GPIO_OSPEED_HIGH	0x3
+/**@}*/
+
+/*****************************************************************************/
+/* API definitions                                                           */
+/*****************************************************************************/
+
+/*****************************************************************************/
+/* API Functions                                                             */
+/*****************************************************************************/
+
+BEGIN_DECLS
+
+END_DECLS
+
+#endif

include/libopencm3/stm32/l4/memorymap.h

@@ -32,7 +32,7 @@
 #define PERIPH_BASE_APB1		(PERIPH_BASE + 0x00000)
 #define PERIPH_BASE_APB2		(PERIPH_BASE + 0x10000)
 #define PERIPH_BASE_AHB1		(PERIPH_BASE + 0x20000)
-#define PERIPH_BASE_AHB2		(PERIPH_BASE + 0x80000)
+#define PERIPH_BASE_AHB2		(0x48000000U)
 
 /* Register boundary addresses */
 
@@ -93,10 +93,10 @@
 #define TSC_BASE			(PERIPH_BASE_AHB1 + 0x4000)
 
 /* AHB2 */
-#define GPIO_PORT_A_BASE		(PERIPH_BASE_AHB2 + 0x00000)
+#define GPIO_PORT_A_BASE		(PERIPH_BASE_AHB2 + 0x0000)
-#define GPIO_PORT_B_BASE		(PERIPH_BASE_AHB2 + 0x00000)
+#define GPIO_PORT_B_BASE		(PERIPH_BASE_AHB2 + 0x0400)
-#define GPIO_PORT_C_BASE		(PERIPH_BASE_AHB2 + 0x00000)
+#define GPIO_PORT_C_BASE		(PERIPH_BASE_AHB2 + 0x0800)
-#define GPIO_PORT_D_BASE		(PERIPH_BASE_AHB2 + 0x00000)
+#define GPIO_PORT_D_BASE		(PERIPH_BASE_AHB2 + 0x0c00)
 #define GPIO_PORT_E_BASE		(PERIPH_BASE_AHB2 + 0x1000)
 #define GPIO_PORT_F_BASE		(PERIPH_BASE_AHB2 + 0x1400)
 #define GPIO_PORT_G_BASE		(PERIPH_BASE_AHB2 + 0x1800)

lib/stm32/l4/Makefile

@@ -41,6 +41,7 @@ OBJS		=
 
 # common/shared objs
 OBJS            += rcc_common_all.o
+OBJS            += gpio_common_all.o gpio_common_f0234.o
 
 VPATH += ../../usb:../:../../cm3:../common
 VPATH += ../../ethernet