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403a038845
Mutex system call fixed for multiple contenders Userspace irq support extended to keyboard/mouse. Scheduler modified for real-time irq tasks
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
/*
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* SP804 primecell driver honoring generic
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* timer library API
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*
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* Copyright (C) 2010 B Labs Ltd.
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*
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* Author: Bahadir Balban
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*/
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#include <l4lib/types.h>
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#include "timer.h"
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/* Enable timer with its current configuration */
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void timer_start(unsigned long timer_base)
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{
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volatile u32 reg = read(timer_base + SP804_CTRL);
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reg |= SP804_ENABLE;
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write(reg, timer_base + SP804_CTRL);
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}
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/* Load the timer with ticks value */
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void timer_load(u32 loadval, unsigned long timer_base)
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{
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write(loadval, timer_base + SP804_LOAD);
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}
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u32 timer_read(unsigned long timer_base)
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{
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return read(timer_base + SP804_VALUE);
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}
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void timer_stop(unsigned long timer_base)
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{
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write(0, timer_base + SP804_CTRL);
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}
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void timer_init_periodic(unsigned long timer_base, u32 load_value)
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{
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volatile u32 reg = read(timer_base + SP804_CTRL);
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reg |= SP804_PERIODIC | SP804_32BIT | SP804_IRQEN;
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write(reg, timer_base + SP804_CTRL);
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if (load_value)
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timer_load(load_value, timer_base);
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else
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/* 1 tick per usec, 1 irq per msec */
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timer_load(1000, timer_base);
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}
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void timer_init_oneshot(unsigned long timer_base)
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{
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volatile u32 reg = read(timer_base + SP804_CTRL);
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/* One shot, 32 bits, no irqs */
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reg |= SP804_32BIT | SP804_ONESHOT;
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write(reg, timer_base + SP804_CTRL);
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}
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void timer_init(unsigned long timer_base, u32 load_value)
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{
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timer_stop(timer_base);
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timer_init_periodic(timer_base, load_value);
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}
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