mirror of
https://github.com/RIOT-OS/RIOT.git
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df5c319978
Provide a common clock initialization driver rather than leaving clock initialization to the boards code. A declarative description of the board's clock configuration using a struct does still allow to fine-tune settings. In addition, a board is still allowed to just provide a custom `void clock_init(void)` if there really is the need to do crazy things.
146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Modified by Kaspar Schleiser
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*/
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/**
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* @ingroup cpu
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* @{
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*
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* @file
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* @brief MSP430 CPU initialization
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*
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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* @author Oliver Hahm <oliver.hahm@inria.fr>
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*
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* @}
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*/
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#include "cpu.h"
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#include "irq.h"
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#include "periph/init.h"
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#include "periph_cpu.h"
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/*---------------------------------------------------------------------------*/
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static void
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init_ports(void)
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{
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/* Turn everything off, device drivers enable what is needed. */
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/* All configured for digital I/O */
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#ifdef P1SEL
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P1SEL = 0;
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#endif
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#ifdef P2SEL
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P2SEL = 0;
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#endif
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#ifdef P3SEL
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P3SEL = 0;
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#endif
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#ifdef P4SEL
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P4SEL = 0;
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#endif
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#ifdef P5SEL
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P5SEL = 0;
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#endif
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#ifdef P6SEL
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P6SEL = 0;
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#endif
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/* All available inputs */
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#ifdef P1DIR
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P1DIR = 0;
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P1OUT = 0;
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#endif
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#ifdef P2DIR
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P2DIR = 0;
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P2OUT = 0;
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#endif
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#ifdef P3DIR
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P3DIR = 0;
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P3OUT = 0;
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#endif
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#ifdef P4DIR
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P4DIR = 0;
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P4OUT = 0;
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#endif
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#ifdef P5DIR
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P5DIR = 0;
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P5OUT = 0;
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#endif
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#ifdef P6DIR
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P6DIR = 0;
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P6OUT = 0;
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#endif
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P1IE = 0;
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P2IE = 0;
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}
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void msp430_cpu_init(void)
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{
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irq_disable();
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init_ports();
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clock_init();
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irq_enable();
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}
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/*---------------------------------------------------------------------------*/
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#define asmv(arg) __asm__ __volatile__(arg)
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/*---------------------------------------------------------------------------*/
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/*
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* Mask all interrupts that can be masked.
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*/
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int
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splhigh_(void)
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{
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/* Clear the GIE (General Interrupt Enable) flag. */
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int sr;
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asmv("mov r2, %0" : "=r"(sr));
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asmv("bic %0, r2" : : "i"(GIE));
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asmv("nop");
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return sr & GIE; /* Ignore other sr bits. */
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Restore previous interrupt mask.
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*/
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void
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splx_(int sr)
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{
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sr &= GIE;
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/* If GIE was set, restore it. */
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asmv("bis %0, r2" : : "r"(sr));
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asmv("nop");
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}
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extern void board_init(void);
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