diff options
Diffstat (limited to 'arch/x86/lib/pcat_timer.c')
-rw-r--r-- | arch/x86/lib/pcat_timer.c | 37 |
1 files changed, 18 insertions, 19 deletions
diff --git a/arch/x86/lib/pcat_timer.c b/arch/x86/lib/pcat_timer.c index f2a5422..6b3db69 100644 --- a/arch/x86/lib/pcat_timer.c +++ b/arch/x86/lib/pcat_timer.c @@ -30,7 +30,7 @@ #define TIMER0_VALUE 0x04aa /* 1kHz 1.9318MHz / 1000 */ #define TIMER2_VALUE 0x0a8e /* 440Hz */ -static int timer_init_done = 0; +static int timer_init_done; int timer_init(void) { @@ -42,18 +42,18 @@ int timer_init(void) * (to stasrt a beep: write 3 to port 0x61, * to stop it again: write 0) */ - outb (PIT_CMD_CTR0 | PIT_CMD_BOTH | PIT_CMD_MODE2, - PIT_BASE + PIT_COMMAND); - outb (TIMER0_VALUE & 0xff, PIT_BASE + PIT_T0); - outb (TIMER0_VALUE >> 8, PIT_BASE + PIT_T0); + outb(PIT_CMD_CTR0 | PIT_CMD_BOTH | PIT_CMD_MODE2, + PIT_BASE + PIT_COMMAND); + outb(TIMER0_VALUE & 0xff, PIT_BASE + PIT_T0); + outb(TIMER0_VALUE >> 8, PIT_BASE + PIT_T0); - outb (PIT_CMD_CTR2 | PIT_CMD_BOTH | PIT_CMD_MODE3, - PIT_BASE + PIT_COMMAND); - outb (TIMER2_VALUE & 0xff, PIT_BASE + PIT_T2); - outb (TIMER2_VALUE >> 8, PIT_BASE + PIT_T2); + outb(PIT_CMD_CTR2 | PIT_CMD_BOTH | PIT_CMD_MODE3, + PIT_BASE + PIT_COMMAND); + outb(TIMER2_VALUE & 0xff, PIT_BASE + PIT_T2); + outb(TIMER2_VALUE >> 8, PIT_BASE + PIT_T2); - irq_install_handler (0, timer_isr, NULL); - unmask_irq (0); + irq_install_handler(0, timer_isr, NULL); + unmask_irq(0); timer_init_done = 1; @@ -64,21 +64,20 @@ static u16 read_pit(void) { u8 low; - outb (PIT_CMD_LATCH, PIT_BASE + PIT_COMMAND); - low = inb (PIT_BASE + PIT_T0); + outb(PIT_CMD_LATCH, PIT_BASE + PIT_COMMAND); + low = inb(PIT_BASE + PIT_T0); - return ((inb (PIT_BASE + PIT_T0) << 8) | low); + return (inb(PIT_BASE + PIT_T0) << 8) | low; } /* this is not very exact */ -void __udelay (unsigned long usec) +void __udelay(unsigned long usec) { int counter; int wraps; - if (timer_init_done) - { - counter = read_pit (); + if (timer_init_done) { + counter = read_pit(); wraps = usec / 1000; usec = usec % 1000; @@ -92,7 +91,7 @@ void __udelay (unsigned long usec) } while (1) { - int new_count = read_pit (); + int new_count = read_pit(); if (((new_count < usec) && !wraps) || wraps < 0) break; |