b4b7c7501e
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21124 a1c6a512-1295-4272-9138-f99709370657
145 lines
6.7 KiB
C
145 lines
6.7 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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* $Id$
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*
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* Copyright © 2008 Rafaël Carré
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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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#ifndef CLOCK_TARGET_H
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#define CLOCK_TARGET_H
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/* returns clock divider, given maximal target frequency and clock reference */
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#define CLK_DIV(ref, target) ((ref + target - 1) / target)
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/* Frequency and Bus Settings
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* These bus settings work on the assumption that unboosted performance will be
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* based on fastbus mode(FCLK == PCLK) at a frequency configured with this file.
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* Boosted performance defaults to synchronous bus but will be changed to
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* asynchronous bus if FCLK is not an integer multiple of PCLK.
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* The player starts up in fastbus mode and synchronous or asynchronous mode is
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* implemented in the set_cpu_frequency() function in system-as3525.c. There
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* are limitations on both frequencies and frequency relationships listed in 7.3.14
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* of the as3525 datasheet that need to be observed. If you are determined to
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* use a frequency that is not "legal" you can do that. There are no checks for
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* legal frequency values, only some validity checks to make sure the divider
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* value fits into the number of bits allotted to it.
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*
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* The CLOCK_DIV macro does a pretty good job at selecting divider values but
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* you can always override it by choosing your own value and commenting out the
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* macro. If you are going to use AS3525_FCLK_PREDIV or AS3525_PCLK_DIV1 you
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* will have to do a manual calculation. I have included USB & PLLB for future
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* use but commented them out for now.
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*/
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/* Clock Sources */
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#define AS3525_CLK_MAIN 0
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#define AS3525_CLK_PLLA 1
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//#define AS3525_CLK_PLLB 2
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#define AS3525_CLK_FCLK 3 /* Available as PCLK input only */
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/* PLL frequencies and settings*/
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#define AS3525_PLLA_FREQ 248000000 /*124,82.7,62,49.6,41.3,35.4 */
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/* FCLK_PREDIV-> *7/8 = 217MHz 108.5 ,72.3, 54.25, 43.4, 36.17 */
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/* *6/8 = 186MHz 93, 62, 46.5, 37.2 */
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/* *5/8 = 155MHz 77.5, 51.67, 38.75 */
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#define AS3525_PLLA_SETTING 0x261F
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//#define AS3525_PLLA_FREQ 384000000 /*192,128,96,76.8,64,54.9,48,42.7,38.4*/
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/* FCLK_PREDIV-> *7/8 = 336MHz 168, 112, 84, 67.2, 56, 48, 42, 37.3*/
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/* *6/8 = 288MHz 144, 96, 72, 57.6, 48, 41.1, */
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/* *5/8 = 240MHz 120, 80, 60, 48, 40 */
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//#define AS3525_PLLA_SETTING 0x2630
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/* PLLB not used at this time! */
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//#define AS3525_PLLB_FREQ
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//#define AS3525_PLLB_SETTING
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/** ************ Change these to reconfigure clocking scheme *******************/
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#define AS3525_FCLK_FREQ 248000000 /* Boosted FCLK frequency */
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#define AS3525_PCLK_FREQ 62000000 /* Initial PCLK frequency */
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#define AS3525_DBOP_FREQ AS3525_PCLK_FREQ /* Initial DBOP frequency */
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/** ****************************************************************************/
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/* Figure out if we need to use asynchronous bus */
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#if (AS3525_FCLK_FREQ % AS3525_PCLK_FREQ)
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#define ASYNCHRONOUS_BUS /* Boosted mode asynchronous */
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#endif
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/* Tell the software what frequencies we're running */
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#define CPUFREQ_MAX AS3525_FCLK_FREQ
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#define CPUFREQ_DEFAULT AS3525_PCLK_FREQ
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#define CPUFREQ_NORMAL AS3525_PCLK_FREQ
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/* FCLK */
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#define AS3525_FCLK_SEL AS3525_CLK_PLLA
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#define AS3525_FCLK_PREDIV 0 /* div = (8-n)/8 acts strange when used!*/
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#define AS3525_FCLK_POSTDIV (CLK_DIV(AS3525_PLLA_FREQ, AS3525_FCLK_FREQ) - 1) /*div=1/(n+1)*/
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/* PCLK */
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#ifdef ASYNCHRONOUS_BUS
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#define AS3525_PCLK_SEL AS3525_CLK_PLLA /* PLLA input for asynchronous */
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#define AS3525_PCLK_DIV0 (CLK_DIV(AS3525_PLLA_FREQ, AS3525_PCLK_FREQ) - 1)/*div=1/(n+1)*/
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#else
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#define AS3525_PCLK_SEL AS3525_CLK_FCLK /* Fclk input for synchronous */
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#define AS3525_PCLK_DIV0 (CLK_DIV(AS3525_FCLK_FREQ, AS3525_PCLK_FREQ) - 1) /*div=1/(n+1)*/
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#endif
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#define AS3525_PCLK_DIV1 0 /* div = 1/(n+1) unable to use successfuly so far*/
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/* PCLK as Source */
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#define AS3525_DBOP_DIV (CLK_DIV(AS3525_PCLK_FREQ, AS3525_DBOP_FREQ) - 1) /*div=1/(n+1)*/
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#define AS3525_I2C_PRESCALER CLK_DIV(AS3525_PCLK_FREQ, AS3525_I2C_FREQ)
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#define AS3525_I2C_FREQ 400000
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#define AS3525_SD_IDENT_DIV ((CLK_DIV(AS3525_PCLK_FREQ, AS3525_SD_IDENT_FREQ) / 2) - 1)
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#define AS3525_SD_IDENT_FREQ 400000 /* must be between 100 & 400 kHz */
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#define AS3525_IDE_SEL AS3525_CLK_PLLA /* Input Source */
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#define AS3525_IDE_DIV (CLK_DIV(AS3525_PLLA_FREQ, AS3525_IDE_FREQ) - 1)/*div=1/(n+1)*/
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#define AS3525_IDE_FREQ 90000000 /* The OF uses 66MHz maximal freq
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but sd transfers fail on some
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players with this limit */
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//#define AS3525_USB_SEL AS3525_CLK_PLLA /* Input Source */
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//#define AS3525_USB_DIV /* div = 1/(n=0?1:2n)*/
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/* Validity Checks */
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/* AS3525_PCLK_FREQ */
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#if (CLK_DIV(AS3525_PLLA_FREQ, AS3525_PCLK_FREQ) - 1) >= (1<<4) /* 4 bits */
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#error PCLK frequency is too low : clock divider will not fit !
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#endif
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/* AS3525_DBOP_FREQ */
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#if (CLK_DIV(AS3525_PCLK_FREQ, AS3525_DBOP_FREQ) - 1) >= (1<<3) /* 3 bits */
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#error DBOP frequency is too low : clock divider will not fit !
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#endif
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/* AS3525_IDE_FREQ */
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#if (CLK_DIV(AS3525_PLLA_FREQ, AS3525_IDE_FREQ) - 1) >= (1<<4) /* 4 bits */
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#error IDE frequency is too low : clock divider will not fit !
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#endif
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/* AS3525_I2C_FREQ */
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#if (CLK_DIV(AS3525_PCLK_FREQ, AS3525_I2C_FREQ)) >= (1<<10) /* 2+8 bits */
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#error I2C frequency is too low : clock divider will not fit !
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#endif
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/* AS3525_SD_IDENT_FREQ */
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#if ((CLK_DIV(AS3525_PCLK_FREQ, AS3525_SD_IDENT_FREQ) / 2) - 1) >= (1<<8) /* 8 bits */
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#error SD IDENTIFICATION frequency is too low : clock divider will not fit !
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#endif
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#endif /* CLOCK_TARGET_H */
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