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sd-as3525: avoid division when calculating current bank, we only deal with 1 or 2 banks

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26161 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2010-05-19 12:11:57 +00:00
parent 6f2afd36bc
commit b3a8170afe
1 changed files with 7 additions and 5 deletions
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12
firmware/target/arm/as3525/sd-as3525.c
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@ -105,7 +105,7 @@ static int sd_select_bank(signed char bank);
static int sd_init_card(const int drive);
static void init_pl180_controller(const int drive);
#define BLOCKS_PER_BANK 0x7a7800
#define BLOCKS_PER_BANK 0x7a7800u
static tCardInfo card_info[NUM_DRIVES];
@ -712,7 +712,12 @@ static int sd_transfer_sectors(IF_MD2(int drive,) unsigned long start,
/* Only switch banks for internal storage */
if(drive == INTERNAL_AS3525)
{
unsigned int bank = start / BLOCKS_PER_BANK; /* Current bank */
unsigned int bank = 0;
while(bank_start >= BLOCKS_PER_BANK)
{
bank_start -= BLOCKS_PER_BANK;
bank++;
}
/* Switch bank if needed */
if(card_info[INTERNAL_AS3525].current_bank != bank)
@ -725,9 +730,6 @@ static int sd_transfer_sectors(IF_MD2(int drive,) unsigned long start,
}
}
/* Adjust start block in current bank */
bank_start -= bank * BLOCKS_PER_BANK;
/* Do not cross a bank boundary in a single transfer loop */
if((transfer + bank_start) > BLOCKS_PER_BANK)
transfer = BLOCKS_PER_BANK - bank_start;