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fat_read() now reads multiple sectors per ATA command

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1737 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Björn Stenberg 2002-08-14 16:39:39 +00:00
parent 63457c5c63
commit 30033df6fa
1 changed files with 18 additions and 9 deletions
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25
firmware/drivers/fat.c
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@ -881,20 +881,14 @@ int fat_read( struct fat_file *file, int sectorcount, void* buf )
int cluster = file->nextcluster; int cluster = file->nextcluster;
int sector = file->nextsector; int sector = file->nextsector;
int numsec = file->sectornum; int numsec = file->sectornum;
int first = sector, last = sector;
int err, i; int err, i;
if ( sector == -1 ) if ( sector == -1 )
return 0; return 0;
/* find sequential sectors and read them all at once */
for (i=0; i<sectorcount; i++ ) { for (i=0; i<sectorcount; i++ ) {
err = ata_read_sectors(sector + fat_bpb.startsector, 1,
(char*)buf+(i*SECTOR_SIZE));
if(err) {
DEBUGF( "fat_read() - Couldn't read sector %d"
" (error code %d)\n", sector,err);
return -1;
}
numsec++; numsec++;
if ( numsec >= fat_bpb.bpb_secperclus ) { if ( numsec >= fat_bpb.bpb_secperclus ) {
cluster = get_next_cluster(cluster); cluster = get_next_cluster(cluster);
@ -911,6 +905,21 @@ int fat_read( struct fat_file *file, int sectorcount, void* buf )
} }
else else
sector++; sector++;
if ( (sector != last+1) || /* not sequential any more? */
(i == sectorcount-1) || /* last sector requested? */
(last-first+1 == 256) ) { /* max 256 sectors per ata request */
int count = last-first+1;
err = ata_read_sectors(first + fat_bpb.startsector, count, buf);
if(err) {
DEBUGF( "fat_read() - Couldn't read sector %d"
" (error code %d)\n", sector,err);
return -1;
}
((char*)buf) += count * SECTOR_SIZE;
first = sector;
}
last = sector;
} }
file->nextcluster = cluster; file->nextcluster = cluster;
file->nextsector = sector; file->nextsector = sector;