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(Re-)added the delayed write feature to avoid wearing the flash unnecessarily

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5162 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2004-10-04 22:29:06 +00:00
parent 36813086e6
commit a15386bb9d
1 changed files with 24 additions and 4 deletions
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28
firmware/drivers/ata_mmc.c
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@ -99,6 +99,10 @@ static char mmc_stack[DEFAULT_STACK_SIZE];
static const char mmc_thread_name[] = "mmc";
static struct event_queue mmc_queue;
static bool initialized = false;
static bool delayed_write = false;
static unsigned char delayed_sector[SECTOR_SIZE];
static int delayed_sector_num;
static int current_card = 0;
static const unsigned char dummy[] = {
@ -264,7 +268,7 @@ static unsigned char poll_busy(int timeout)
/* get data response */
SSR1 = 0; /* start receiving */
while (!(SSR1 & SCI_RDRF)); /* wait for data */
data = RDR1; /* read byte */
data = fliptable[(signed char)(RDR1)]; /* read byte */
/* wait until the card is ready again */
i = 0;
@ -274,7 +278,7 @@ static unsigned char poll_busy(int timeout)
dummy = RDR1; /* read byte */
} while ((dummy != 0xFF) && (++i < timeout));
return fliptable[(signed char)data];
return data;
}
static int send_cmd(int cmd, unsigned long parameter, unsigned char *response)
@ -498,6 +502,10 @@ int ata_read_sectors(unsigned long start,
deselect_card();
mutex_unlock(&mmc_mutex);
/* only flush if reading went ok */
if ( (ret == 0) && delayed_write )
ata_flush();
return ret;
}
@ -552,17 +560,29 @@ int ata_write_sectors(unsigned long start,
deselect_card();
mutex_unlock(&mmc_mutex);
/* only flush if writing went ok */
if ( (ret == 0) && delayed_write )
ata_flush();
return ret;
}
/* no need to delay with flash memory. There is no spinup :) */
/* While there is no spinup, the delayed write is still here to avoid
wearing the flash unnecessarily */
extern void ata_delayed_write(unsigned long sector, const void* buf)
{
ata_write_sectors(sector, 1, buf);
memcpy(delayed_sector, buf, SECTOR_SIZE);
delayed_sector_num = sector;
delayed_write = true;
}
extern void ata_flush(void)
{
if ( delayed_write ) {
DEBUGF("ata_flush()\n");
delayed_write = false;
ata_write_sectors(delayed_sector_num, 1, delayed_sector);
}
}
void ata_spindown(int seconds)