RCC: Break out some portable functionality from stm32f1/.

Portions of rcc_clk_enable(), rcc_reset_dev(), and rcc_set_prescaler()
are portable; break these into static inline helpers in
rcc_private.h. These guts of these are portable, but the arrays of
registers etc. are not.

Also add an extern declaration for rcc_dev_table into
rcc_private.h. This lets us put rcc_dev_clk() into a newly resurrected
libmaple/rcc.c, since that's portable.

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

1 files changed, 44 insertions, 0 deletions

diff --git a/libmaple/rcc.c b/libmaple/rcc.c
new file mode 100644
index 0000000..d6ed2d6
--- /dev/null
+++ b/libmaple/rcc.c
@@ -0,0 +1,44 @@
+/******************************************************************************
+ * 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/rcc.c
+ * @brief Portable RCC routines.
+ */
+
+#include <libmaple/rcc.h>
+
+#include "rcc_private.h"
+
+/**
+ * @brief Get a peripheral's clock domain
+ * @param id Clock ID of the peripheral whose clock domain to return
+ * @return Clock source for the given clock ID
+ */
+rcc_clk_domain rcc_dev_clk(rcc_clk_id id) {
+    return rcc_dev_table[id].clk_domain;
+}