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set/clear port bits with atomic instructions instead of read-modify-write, saves time+space, allows port usage in ISR

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4022 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jörg Hohensohn 2003-11-06 01:34:50 +00:00
parent 9e95757928
commit 75bab49a54
8 changed files with 88 additions and 67 deletions
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14
firmware/drivers/ata.c
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@ -607,11 +607,11 @@ int ata_hard_reset(void)
int ret;
/* state HRR0 */
PADR &= ~0x0200; /* assert _RESET */
__clear_bit_constant(9-8, &PADRH); /* assert _RESET */
sleep(1); /* > 25us */
/* state HRR1 */
PADR |= 0x0200; /* negate _RESET */
__set_bit_constant(9-8, &PADRH); /* negate _RESET */
sleep(1); /* > 2ms */
/* state HRR2 */
@ -718,11 +718,11 @@ static int io_address_detect(void)
void ata_enable(bool on)
{
if(on)
PADR &= ~0x80; /* enable ATA */
__clear_bit_constant(7, &PADRL); /* enable ATA */
else
PADR |= 0x80; /* disable ATA */
__set_bit_constant(7, &PADRL); /* disable ATA */
PAIOR |= 0x80;
__set_bit_constant(7, &PAIORL);
}
static int identify(void)
@ -787,8 +787,8 @@ int ata_init(void)
led(false);
/* Port A setup */
PAIOR |= 0x0200; /* output for ATA reset */
PADR |= 0x0200; /* release ATA reset */
__set_bit_constant(9-8, &PAIORH); /* output for ATA reset */
__set_bit_constant(9-8, &PADRH); /* release ATA reset */
PACR2 &= 0xBFFF; /* GPIO function for PA7 (IDE enable) */
sleeping = false;