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9e2c85e076
This is part of the preparation to add support for iPod Nano 3G and Nano 4G. There are some optimisations left, like merging similar blocks of registers that share the same layout, but the base address have changed between SoC generations. Change-Id: I4f06727b4061977141b65d39ae19591bd5b29680
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id: timer-s5l8700.c 23103 2009-10-11 11:35:14Z theseven $
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*
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* Copyright (C) 2009 Bertrik Sikken
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "inttypes.h"
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#include "s5l87xx.h"
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#include "system.h"
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#include "timer.h"
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void INT_TIMERF(void)
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{
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/* clear interrupt */
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TSTAT = (0x07 << 16);
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if (pfn_timer != NULL) {
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pfn_timer();
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}
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}
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bool timer_set(long cycles, bool start)
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{
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int tf_en = TFCMD & (1 << 0); /* save TF_EN status */
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/* stop timer */
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TFCMD = (0 << 0); /* TF_EN = disable */
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/* optionally unregister any previously registered timer user */
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if (start) {
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if (pfn_unregister != NULL) {
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pfn_unregister();
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pfn_unregister = NULL;
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}
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}
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/* configure timer */
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TFCON = (1 << 12) | /* TF_INT0_EN */
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(4 << 8) | /* TF_CS = ECLK / 1 */
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(1 << 6) | /* select ECLK (12 MHz) */
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(0 << 4); /* TF_MODE_SEL = interval mode */
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TFPRE = 0; /* no prescaler */
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TFDATA0 = cycles; /* set interval period */
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/* After the configuration, we must write '1' in TF_CLR to
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* initialize the timer (s5l8700 DS):
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* - Clear the counter register.
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* - The value of TF_START is set to TF_OUT.
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* - TF_DATA0 and TF_DATA1 are updated to the internal buffers.
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* - Initialize the state of the previously captured signal.
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*/
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TFCMD = (1 << 1) | /* TF_CLR = initialize timer */
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(tf_en << 0); /* TF_EN = restore previous status */
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return true;
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}
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bool timer_start(void)
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{
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TFCMD = (1 << 0); /* TF_EN = enable */
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return true;
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}
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void timer_stop(void)
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{
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TFCMD = (0 << 0); /* TF_EN = disable */
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}
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