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, 67 insertions, 0 deletions

diff --git a/libmaple/rcc_private.h b/libmaple/rcc_private.h
new file mode 100644
index 0000000..66eaf00
--- /dev/null
+++ b/libmaple/rcc_private.h
@@ -0,0 +1,67 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * 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.
+ *****************************************************************************/
+
+/*
+ * RCC private header.
+ */
+
+#ifndef _LIBMAPLE_PRIVATE_RCC_H_
+#define _LIBMAPLE_PRIVATE_RCC_H_
+
+#include <libmaple/bitband.h>
+
+struct rcc_dev_info {
+    const rcc_clk_domain clk_domain;
+    const uint8 line_num;
+};
+
+extern const struct rcc_dev_info rcc_dev_table[];
+
+static inline void rcc_do_clk_enable(__io uint32** enable_regs,
+                                     rcc_clk_id id) {
+    __io uint32 *enable_reg = enable_regs[rcc_dev_clk(id)];
+    uint8 line_num = rcc_dev_table[id].line_num;
+    bb_peri_set_bit(enable_reg, line_num, 1);
+}
+
+static inline void rcc_do_reset_dev(__io uint32** reset_regs,
+                                    rcc_clk_id id) {
+    __io uint32 *reset_reg = reset_regs[rcc_dev_clk(id)];
+    uint8 line_num = rcc_dev_table[id].line_num;
+    bb_peri_set_bit(reset_reg, line_num, 1);
+    bb_peri_set_bit(reset_reg, line_num, 0);
+}
+
+static inline void rcc_do_set_prescaler(const uint32 *masks,
+                                        rcc_prescaler prescaler,
+                                        uint32 divider) {
+    uint32 cfgr = RCC_BASE->CFGR;
+    cfgr &= ~masks[prescaler];
+    cfgr |= divider;
+    RCC_BASE->CFGR = cfgr;
+}
+
+#endif