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490 lines
16 KiB
490 lines
16 KiB
/*****************************************************************************
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* *
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* FAT-FTL Lite Software Development Kit *
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* Copyright (C) M-Systems Ltd. 1995-2001 *
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* *
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*****************************************************************************
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* *
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* In order to make your code faster: *
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* *
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* 1. Get rid of routines flRead8bitRegPlus()/flPreInitRead8bitReg()Plus, *
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* and make M+ MTD calling routine mplusReadReg8() directly. *
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* *
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* 2. Get rid of routines flWrite8bitRegPlus()/flPreInitWrite8bitReg()Plus, *
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* and make M+ MTD calling routine mplusWriteReg8() directly. *
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* *
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* 3. Eliminate overhead of calling routines tffscpy/tffsset() by *
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* adding these routines' code into docPlusRead/docPlusWrite/docPlusSet *
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* routines. *
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* *
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*****************************************************************************/
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/*
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* $Log: V:/Flite/archives/TrueFFS5/Src/docsysp.c_V $
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*
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* Rev 1.4 Nov 18 2001 20:26:50 oris
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* Bug fix- Bad implementation of 8-bit access when ENVIRNOMENT_VARS is not defined.
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*
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* Rev 1.3 Nov 16 2001 00:26:54 oris
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* When ENVIRONMENT_VARS is not defined use for loop of bytes instead of tffscpy.
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*
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* Rev 1.2 Sep 25 2001 15:39:38 oris
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* Bug fix - Add special support for flUse8Bit environement variable.
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*
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* Rev 1.1 Sep 24 2001 18:23:32 oris
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* Completely revised to support runtime true 16-bit access.
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*/
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/*
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* configuration
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*/
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/* #define FL_INIT_MMU_PAGES */
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/*
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* includes
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*/
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#include "docsysp.h"
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/*
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* macros
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*/
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/* types of access to M+: 8 or 16-bit */
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#define FL_MPLUS_ACCESS_8BIT 0x10
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#define FL_MPLUS_ACCESS_16BIT 0x20
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#define FL_MPLUS_ACCESS_MASK 0xf0 /* mask for the above */
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/* in case of 16-bit access to M+ */
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#define FL_MPLUS_ACCESS_BE 0x100
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/*
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* routines
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*/
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#ifdef FL_INIT_MMU_PAGES
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static void flInitMMUpages (byte FAR1 *buf, int bufsize);
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#endif
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/*
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* vars
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*/
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/* run-time configuration of DiskOnChip access */
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int flMplusAccessType = FL_MPLUS_ACCESS_8BIT;
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/* FL_MPLUS_ACCESS_8BIT
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FL_MPLUS_ACCESS_16BIT
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FL_MPLUS_ACCESS_BE */
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/* ---------------------------------------------------------------------- *
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* *
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* m p l u s R e a d R e g 8 *
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* *
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* Read single byte from memory mapped 8-bit M+ register. *
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* *
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* ---------------------------------------------------------------------- */
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unsigned char mplusReadReg8 ( void FAR0 * win, int offset )
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{
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if( flMplusAccessType & FL_MPLUS_ACCESS_16BIT ) {
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/* can't read byte, only short word */
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unsigned short sval;
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sval = *((volatile unsigned short FAR0 *)win + (offset >> 1));
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return *(((unsigned char *) &sval) + (offset & 0x1));
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}
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/* FL_MPLUS_ACCESS_8BIT case */
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return *((volatile unsigned char FAR0 *)win + offset);
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}
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/* ---------------------------------------------------------------------- *
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* *
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* m p l u s W r i t e R e g 8 *
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* *
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* Write single byte to memory mapped 8-bit M+ register. *
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* *
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* ---------------------------------------------------------------------- */
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void mplusWriteReg8 ( void FAR0 * win, int offset, unsigned char val )
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{
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switch( flMplusAccessType & FL_MPLUS_ACCESS_MASK ) {
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case FL_MPLUS_ACCESS_16BIT:
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*((volatile unsigned short FAR0 *)win + (offset >> 1)) =
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(unsigned short)(val * 0x0101);
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break;
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default: /* FL_MPLUS_ACCESS_8BIT */
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*((volatile unsigned char FAR0 *)win + offset) = val;
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break;
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}
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}
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/* ---------------------------------------------------------------------- *
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* *
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* f l R e a d 1 6 b i t R e g P l u s *
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* *
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* Read single word from memory mapped 16-bit M+ register. *
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* *
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* ---------------------------------------------------------------------- */
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Reg16bitType flRead16bitRegPlus ( FLFlash vol, unsigned offset )
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{
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return (Reg16bitType)
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(*((volatile unsigned short FAR0 *)((char FAR0 *)NFDC21thisVars->win + (int)offset)));
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}
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/* ---------------------------------------------------------------------- *
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* *
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* f l W r i t e 1 6 b i t R e g P l u s *
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* *
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* Write single word to memory mapped 16-bit M+ register. *
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* *
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* ---------------------------------------------------------------------- */
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void flWrite16bitRegPlus ( FLFlash vol, unsigned offset, Reg16bitType val )
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{
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*((volatile unsigned short FAR0 *)((char FAR0 *)NFDC21thisVars->win + (int)offset)) =
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(unsigned short) val;
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}
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/* ---------------------------------------------------------------------- *
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* *
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* d o c P l u s R e a d *
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* *
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* This routine is called from M+ MTD to read data block from M+. *
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* *
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* ---------------------------------------------------------------------- */
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void docPlusRead ( FLFlash vol, unsigned offset, void FAR1 * dest, unsigned int count )
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{
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volatile unsigned short FAR0 * swin;
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register int i;
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register unsigned short tmp;
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if (count == 0)
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return;
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#ifdef FL_INIT_MMU_PAGES
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flInitMMUpages( (byte FAR1 *)dest, (int)count );
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#endif
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if ((vol.interleaving == 1) && (NFDC21thisVars->if_cfg == 16)) {
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/* rare case: 16-bit hardware interface AND interleave == 1 */
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for (i = 0; i < (int)count; i++) {
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*((unsigned char FAR1 *)dest + i) =
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mplusReadReg8 ((void FAR0 *)NFDC21thisVars->win, ((int)offset));
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}
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}
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else {
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switch( flMplusAccessType & FL_MPLUS_ACCESS_MASK ) {
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case FL_MPLUS_ACCESS_16BIT:
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swin = (volatile unsigned short FAR0 *)NFDC21thisVars->win + ((int)offset >> 1);
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if( pointerToPhysical(dest) & 0x1 ) {
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/* rare case: unaligned target buffer */
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if( flMplusAccessType & FL_MPLUS_ACCESS_BE ) { /* big endian */
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for (i = 0; i < (int)count; ) {
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tmp = *(swin + (i >> 1));
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*((unsigned char FAR1 *)dest + (i++)) = (unsigned char) (tmp >> 8);
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*((unsigned char FAR1 *)dest + (i++)) = (unsigned char) tmp;
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}
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}
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else { /* little endian */
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for (i = 0; i < (int)count; ) {
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tmp = *(swin + (i >> 1));
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*((unsigned char FAR1 *)dest + (i++)) = (unsigned char) tmp;
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*((unsigned char FAR1 *)dest + (i++)) = (unsigned char) (tmp >> 8);
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}
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}
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}
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else { /* mainstream case */
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#ifdef ENVIRONMENT_VARS
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if (flUse8Bit == 0) {
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tffscpy( dest, (void FAR0 *)((NDOC2window)NFDC21thisWin + offset), count );
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}
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else
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#endif /* ENVIRONMENT_VARS */
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{ /* read in short words */ /* andrayk: do we need this ? */
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for (i = 0; i < ((int)count >> 1); i++)
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*((unsigned short FAR1 *)dest + i) = *(swin + i);
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}
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}
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break;
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default: /* FL_MPLUS_ACCESS_8BIT */
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#ifdef ENVIRONMENT_VARS
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tffscpy( dest, (void FAR0 *)((NDOC2window)NFDC21thisWin + offset), count );
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#else
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for (i = 0; i < (int)count; i++)
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((byte FAR1 *)dest)[i] = *((NDOC2window)NFDC21thisWin + offset);
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#endif /* ENVIRONMENT_VARS */
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break;
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}
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}
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}
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/* ---------------------------------------------------------------------- *
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* *
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* d o c P l u s W r i t e *
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* *
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* This routine is called from M+ MTD to write data block to M+. *
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* *
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* ---------------------------------------------------------------------- */
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void docPlusWrite ( FLFlash vol, void FAR1 * src, unsigned int count )
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{
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volatile unsigned short FAR0 * swin;
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register int i;
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register unsigned short tmp;
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if (count == 0)
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return;
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if ((vol.interleaving == 1) && (NFDC21thisVars->if_cfg == 16)) {
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/* rare case: 16-bit hardware interface AND interleave == 1 */
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for (i = 0; i < (int)count; i++) {
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mplusWriteReg8( (void FAR0 *)NFDC21thisVars->win, ((int)NFDC21thisIO),
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*((unsigned char FAR1 *)src + i) );
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}
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}
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else {
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switch( flMplusAccessType & FL_MPLUS_ACCESS_MASK ) {
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case FL_MPLUS_ACCESS_16BIT:
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swin = (volatile unsigned short FAR0 *)NFDC21thisVars->win + ((int)NFDC21thisIO >> 1);
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if( pointerToPhysical(src) & 0x1 ) {
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/* rare case: unaligned source buffer */
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if( flMplusAccessType & FL_MPLUS_ACCESS_BE ) { /* big endian */
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for (i = 0; i < (int)count; ) {
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tmp = ((unsigned short) (*((unsigned char FAR1 *)src + (i++)))) << 8;
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tmp |= (*((unsigned char FAR1 *)src + (i++)));
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*(swin + (i >> 1)) = tmp;
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}
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}
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else {
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for (i = 0; i < (int)count; ) { /* little endian */
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tmp = (*((unsigned char FAR1 *)src + (i++)));
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tmp |= ((unsigned short) (*((unsigned char FAR1 *)src + (i++)))) << 8;
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*(swin + (i >> 1)) = tmp;
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}
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}
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}
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else { /* mainstream case */
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#ifdef ENVIRONMENT_VARS
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if (flUse8Bit == 0) {
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tffscpy( (void FAR0 *)((NDOC2window)NFDC21thisWin + NFDC21thisIO), src, count );
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}
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else
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#endif /* ENVIRONMENT_VARS */
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{ /* write in short words */ /* andrayk: do we need this ? */
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for (i = 0; i < ((int)count >> 1); i++)
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*(swin + i) = *((unsigned short FAR1 *)src + i);
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}
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}
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break;
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default: /* FL_MPLUS_ACCESS_8BIT */
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#ifdef ENVIRONMENT_VARS
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tffscpy( (void FAR0 *)((NDOC2window)NFDC21thisWin + NFDC21thisIO), src, count );
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#else
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for (i = 0; i < (int)count; i++)
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*((NDOC2window)NFDC21thisWin + NFDC21thisIO) =
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((byte FAR1 *)src)[i];
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#endif /* ENVIRONMENT_VARS */
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break;
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}
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}
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}
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/* ---------------------------------------------------------------------- *
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* *
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* d o c P l u s S e t *
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* *
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* This routine is called from M+ MTD to set data block on M+ to 'val'. *
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* *
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* ---------------------------------------------------------------------- */
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void docPlusSet ( FLFlash vol, unsigned int count, unsigned char val )
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{
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volatile unsigned short FAR0 * swin;
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register int i;
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register unsigned short sval;
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if (count == 0)
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return;
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if ((vol.interleaving == 1) && (NFDC21thisVars->if_cfg == 16)) {
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/* rare case: 16-bit hardware interface AND interleave == 1 */
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for (i = 0; i < (int)count; i++)
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mplusWriteReg8( (void FAR0 *)NFDC21thisVars->win, (int)NFDC21thisIO, val );
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}
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else { /* mainstream case */
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switch( flMplusAccessType & FL_MPLUS_ACCESS_MASK ) {
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case FL_MPLUS_ACCESS_16BIT:
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#ifdef ENVIRONMENT_VARS
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if (flUse8Bit == 0) {
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tffsset( (void FAR0 *)((NDOC2window)NFDC21thisWin + NFDC21thisIO), val, count );
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}
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else
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#endif /* ENVIRONMENT_VARS */
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{ /* do short word access */ /* andrayk: do we need this ? */
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swin = (volatile unsigned short FAR0 *)NFDC21thisVars->win +
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((int)NFDC21thisIO >> 1);
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sval = ((unsigned short)val << 8) | val;
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for (i = 0; i < ((int)count >> 1); i++)
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*(swin + i) = sval;
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}
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break;
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default: /* FL_MPLUS_ACCESS_8BIT */
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#ifdef ENVIRONMENT_VARS
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tffsset( (void FAR0 *)((NDOC2window)NFDC21thisWin + NFDC21thisIO), val, count );
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#else
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for (i = 0; i < (int)count; i++)
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*((NDOC2window)NFDC21thisWin + NFDC21thisIO) = val;
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#endif /* ENVIRONMENT_VARS */
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break;
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}
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}
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}
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/* ---------------------------------------------------------------------- *
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* *
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* m p l u s W i n S i z e *
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* *
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* This routine is called from M+ MTD to find out size of M+ window in *
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* bytes. *
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* *
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* ---------------------------------------------------------------------- */
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unsigned long mplusWinSize ( void )
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{
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return 0x2000L;
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}
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#ifdef FL_INIT_MMU_PAGES
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/* ---------------------------------------------------------------------- *
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* *
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* f l I n i t M M U p a g e s *
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* *
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* Initializes the first and last byte of the given buffer. *
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* When the user buffer resides on separated memory pages the read *
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* operation may cause a page fault. Some CPU's return from a page *
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* fault (after loading the new page) and reread the bytes that caused *
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* the page fault from the new loaded page. In order to prevent such a *
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* case the first and last bytes of the buffer are written *
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* *
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* ---------------------------------------------------------------------- */
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static void flInitMMUpages ( byte FAR1 *buf, int bufsize )
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{
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*buf = (byte)0;
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*( addToFarPointer(buf, (bufsize - 1)) ) = (byte)0;
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}
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#endif /* FL_INIT_MMU_PAGES */
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