Move Flash support for STM32F1 to libmaple/stm32f1/.

This is a backwards-compatible change.

The Flash registers on the STM32F2 line are different than on
STM32F1. Therefore, move the register map and bit definitions to new
libmaple/stm32f1/include/family/flash.h.

Move flash_enable_prefetch() from libmaple/flash.c to new
libmaple/stm32f1/flash.c. The remaining pieces of libmaple/flash.c use
a common subset of the Flash registers, so they're's portable to F2,
and that's all we're currently interested in.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

3 files changed, 178 insertions, 0 deletions

diff --git a/libmaple/stm32f1/flash.c b/libmaple/stm32f1/flash.c
new file mode 100644
index 0000000..73fc93f
--- /dev/null
+++ b/libmaple/stm32f1/flash.c
@@ -0,0 +1,41 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ * Copyright (c) 2011 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file libmaple/stm32f1/flash.c
+ * @brief Flash management functions
+ */
+
+#include <libmaple/flash.h>
+#include <libmaple/bitband.h>
+
+/**
+ * @brief Turn on the hardware prefetcher.
+ */
+void flash_enable_prefetch(void) {
+    *bb_perip(&FLASH_BASE->ACR, FLASH_ACR_PRFTBE_BIT) = 1;
+}
diff --git a/libmaple/stm32f1/include/family/flash.h b/libmaple/stm32f1/include/family/flash.h
new file mode 100644
index 0000000..aedb326
--- /dev/null
+++ b/libmaple/stm32f1/include/family/flash.h
@@ -0,0 +1,135 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file libmaple/stm32f1/flash.h
+ * @brief STM32F1 Flash header.
+ *
+ * Provides register map, base pointer, and register bit definitions
+ * for the Flash controller on the STM32F1 line.
+ */
+
+#ifndef _LIBMAPLE_STM32F1_FLASH_H_
+#define _LIBMAPLE_STM32F1_FLASH_H_
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+#include <libmaple/libmaple.h>
+
+/*
+ * Register map
+ */
+
+/** Flash register map type */
+typedef struct flash_reg_map {
+    __io uint32 ACR;            /**< Access control register */
+    __io uint32 KEYR;           /**< Key register */
+    __io uint32 OPTKEYR;        /**< OPTKEY register */
+    __io uint32 SR;             /**< Status register */
+    __io uint32 CR;             /**< Control register */
+    __io uint32 AR;             /**< Address register */
+    __io uint32 OBR;            /**< Option byte register */
+    __io uint32 WRPR;           /**< Write protection register */
+} flash_reg_map;
+
+/** Flash register map base pointer */
+#define FLASH_BASE                      ((struct flash_reg_map*)0x40022000)
+
+/*
+ * Register bit definitions
+ */
+
+/* Access control register */
+
+#define FLASH_ACR_PRFTBS_BIT            5
+#define FLASH_ACR_PRFTBE_BIT            4
+#define FLASH_ACR_HLFCYA_BIT            3
+
+#define FLASH_ACR_PRFTBS                BIT(FLASH_ACR_PRFTBS_BIT)
+#define FLASH_ACR_PRFTBE                BIT(FLASH_ACR_PRFTBE_BIT)
+#define FLASH_ACR_HLFCYA                BIT(FLASH_ACR_HLFCYA_BIT)
+#define FLASH_ACR_LATENCY               0x7
+
+/* Status register */
+
+#define FLASH_SR_EOP_BIT                5
+#define FLASH_SR_WRPRTERR_BIT           4
+#define FLASH_SR_PGERR_BIT              2
+#define FLASH_SR_BSY_BIT                0
+
+#define FLASH_SR_EOP                    BIT(FLASH_SR_EOP_BIT)
+#define FLASH_SR_WRPRTERR               BIT(FLASH_SR_WRPRTERR_BIT)
+#define FLASH_SR_PGERR                  BIT(FLASH_SR_PGERR_BIT)
+#define FLASH_SR_BSY                    BIT(FLASH_SR_BSY_BIT)
+
+/* Control register */
+
+#define FLASH_CR_EOPIE_BIT              12
+#define FLASH_CR_ERRIE_BIT              10
+#define FLASH_CR_OPTWRE_BIT             9
+#define FLASH_CR_LOCK_BIT               7
+#define FLASH_CR_STRT_BIT               6
+#define FLASH_CR_OPTER_BIT              5
+#define FLASH_CR_OPTPG_BIT              4
+#define FLASH_CR_MER_BIT                2
+#define FLASH_CR_PER_BIT                1
+#define FLASH_CR_PG_BIT                 0
+
+#define FLASH_CR_EOPIE                  BIT(FLASH_CR_EOPIE_BIT)
+#define FLASH_CR_ERRIE                  BIT(FLASH_CR_ERRIE_BIT)
+#define FLASH_CR_OPTWRE                 BIT(FLASH_CR_OPTWRE_BIT)
+#define FLASH_CR_LOCK                   BIT(FLASH_CR_LOCK_BIT)
+#define FLASH_CR_STRT                   BIT(FLASH_CR_STRT_BIT)
+#define FLASH_CR_OPTER                  BIT(FLASH_CR_OPTER_BIT)
+#define FLASH_CR_OPTPG                  BIT(FLASH_CR_OPTPG_BIT)
+#define FLASH_CR_MER                    BIT(FLASH_CR_MER_BIT)
+#define FLASH_CR_PER                    BIT(FLASH_CR_PER_BIT)
+#define FLASH_CR_PG                     BIT(FLASH_CR_PG_BIT)
+
+/* Option byte register */
+
+#define FLASH_OBR_nRST_STDBY_BIT        4
+#define FLASH_OBR_nRST_STOP_BIT         3
+#define FLASH_OBR_WDG_SW_BIT            2
+#define FLASH_OBR_RDPRT_BIT             1
+#define FLASH_OBR_OPTERR_BIT            0
+
+#define FLASH_OBR_DATA1                 (0xFF << 18)
+#define FLASH_OBR_DATA0                 (0xFF << 10)
+#define FLASH_OBR_USER                  0x3FF
+#define FLASH_OBR_nRST_STDBY            BIT(FLASH_OBR_nRST_STDBY_BIT)
+#define FLASH_OBR_nRST_STOP             BIT(FLASH_OBR_nRST_STOP_BIT)
+#define FLASH_OBR_WDG_SW                BIT(FLASH_OBR_WDG_SW_BIT)
+#define FLASH_OBR_RDPRT                 BIT(FLASH_OBR_RDPRT_BIT)
+#define FLASH_OBR_OPTERR                BIT(FLASH_OBR_OPTERR_BIT)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/libmaple/stm32f1/rules.mk b/libmaple/stm32f1/rules.mk
index 3c87920..2bdc423 100644
--- a/libmaple/stm32f1/rules.mk
+++ b/libmaple/stm32f1/rules.mk
@@ -10,7 +10,9 @@ CFLAGS_$(d) = -I$(d) $(LIBMAPLE_INCLUDES) -Wall -Werror
 # Local rules and targets
 sSRCS_$(d) := isrs_performance.S            \
               vector_table_performance.S
+
 cSRCS_$(d) := rcc.c
+cSRCS_$(d) += flash.c
 
 sFILES_$(d) := $(sSRCS_$(d):%=$(d)/%)
 cFILES_$(d) := $(cSRCS_$(d):%=$(d)/%)