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AMSSansa: Add AS3525_DRAM_FREQ as a configurable frequency. Attempts to use PCLK != DRAM still fail but a method is now in place. Default scheme remains 248/62/62.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21130 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jack Halpin 2009-05-29 20:19:35 +00:00
parent dd742b72ff
commit 95ac12a68f
1 changed files with 19 additions and 12 deletions
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31
firmware/target/arm/as3525/clock-target.h
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@ -40,9 +40,13 @@
*
* The CLOCK_DIV macro does a pretty good job at selecting divider values but
* you can always override it by choosing your own value and commenting out the
* macro. If you are going to use AS3525_FCLK_PREDIV or AS3525_PCLK_DIV1 you
* will have to do a manual calculation. I have included USB & PLLB for future
* use but commented them out for now.
* macro. AS3525_FCLK_PREDIV values other than 0 allow you to choose frequencies
* from lines below the main PLL frequency lines. AS3525_FCLK_POSTDIV
* will be calculated automagically depending on the value you have selected
* for AS3525_FCLK_FREQ. You may add more PLL frequencies by simply commenting
* out the current #defines for AS3525_PLLA_FREQ & AS3525_PLLA_SETTING and
* adding a #define for FREQ and divider setting to produce that frequency.I
* have included USB & PLLB for future use but commented them out for now.
*/
/* Clock Sources */
@ -51,8 +55,8 @@
//#define AS3525_CLK_PLLB 2
#define AS3525_CLK_FCLK 3 /* Available as PCLK input only */
/** ************ Change these to reconfigure clocking scheme *******************/
/* PLL frequencies and settings*/
#define AS3525_PLLA_FREQ 248000000 /*124,82.7,62,49.6,41.3,35.4 */
/* FCLK_PREDIV-> *7/8 = 217MHz 108.5 ,72.3, 54.25, 43.4, 36.17 */
/* *6/8 = 186MHz 93, 62, 46.5, 37.2 */
@ -69,11 +73,14 @@
//#define AS3525_PLLB_FREQ
//#define AS3525_PLLB_SETTING
/** ************ Change these to reconfigure clocking scheme *******************/
#define AS3525_FCLK_PREDIV 0 /* div = (8-n)/8 Enter manually & postdiv will be calculated*/
/* 0 gives you the PLLA 1st line choices, 1 the 2nd line etc. */
#define AS3525_FCLK_FREQ 248000000 /* Boosted FCLK frequency */
#define AS3525_PCLK_FREQ 62000000 /* Initial PCLK frequency */
#define AS3525_DBOP_FREQ AS3525_PCLK_FREQ /* Initial DBOP frequency */
#define AS3525_FCLK_FREQ 248000000 /* Boosted FCLK frequency */
#define AS3525_DRAM_FREQ 62000000 /* Initial DRAM frequency */
/* AS3525_PCLK_FREQ != AS3525_DRAM_FREQ/1 will boot to white lcd screen */
#define AS3525_PCLK_FREQ AS3525_DRAM_FREQ/1 /* PCLK divided from DRAM freq */
#define AS3525_DBOP_FREQ AS3525_PCLK_FREQ/1 /* DBOP divided from PCLK freq */
/** ****************************************************************************/
@ -89,18 +96,18 @@
/* FCLK */
#define AS3525_FCLK_SEL AS3525_CLK_PLLA
#define AS3525_FCLK_PREDIV 0 /* div = (8-n)/8 Enter manually & postdiv will be calculated*/
#define AS3525_FCLK_POSTDIV (CLK_DIV((AS3525_PLLA_FREQ*(8-AS3525_FCLK_PREDIV)/8), AS3525_FCLK_FREQ) - 1) /*div=1/(n+1)*/
/* PCLK */
#ifdef ASYNCHRONOUS_BUS
#define AS3525_PCLK_SEL AS3525_CLK_PLLA /* PLLA input for asynchronous */
#define AS3525_PCLK_DIV0 (CLK_DIV(AS3525_PLLA_FREQ, AS3525_PCLK_FREQ) - 1)/*div=1/(n+1)*/
#define AS3525_PCLK_DIV0 (CLK_DIV(AS3525_PLLA_FREQ, AS3525_DRAM_FREQ) - 1)/*div=1/(n+1)*/
#else
#define AS3525_PCLK_SEL AS3525_CLK_FCLK /* Fclk input for synchronous */
#define AS3525_PCLK_DIV0 (CLK_DIV(AS3525_FCLK_FREQ, AS3525_PCLK_FREQ) - 1) /*div=1/(n+1)*/
#define AS3525_PCLK_DIV0 (CLK_DIV(AS3525_FCLK_FREQ, AS3525_DRAM_FREQ) - 1) /*div=1/(n+1)*/
#endif
#define AS3525_PCLK_DIV1 0 /* div = 1/(n+1) unable to use successfuly so far*/
/*unable to use AS3525_PCLK_DIV1 != 0 successfuly so far*/
#define AS3525_PCLK_DIV1 (CLK_DIV(AS3525_DRAM_FREQ, AS3525_PCLK_FREQ) - 1)/* div = 1/(n+1)*/
/* PCLK as Source */
#define AS3525_DBOP_DIV (CLK_DIV(AS3525_PCLK_FREQ, AS3525_DBOP_FREQ) - 1) /*div=1/(n+1)*/