diff options
Diffstat (limited to 'qemu/roms/u-boot/arch/microblaze/cpu/timer.c')
-rw-r--r-- | qemu/roms/u-boot/arch/microblaze/cpu/timer.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/arch/microblaze/cpu/timer.c b/qemu/roms/u-boot/arch/microblaze/cpu/timer.c new file mode 100644 index 000000000..3960bbb08 --- /dev/null +++ b/qemu/roms/u-boot/arch/microblaze/cpu/timer.c @@ -0,0 +1,92 @@ +/* + * (C) Copyright 2007 Michal Simek + * + * Michal SIMEK <monstr@monstr.eu> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/microblaze_timer.h> +#include <asm/microblaze_intc.h> + +volatile int timestamp = 0; +microblaze_timer_t *tmr; + +ulong get_timer (ulong base) +{ + if (tmr) + return timestamp - base; + return timestamp++ - base; +} + +void __udelay(unsigned long usec) +{ + u32 i; + + if (tmr) { + i = get_timer(0); + while ((get_timer(0) - i) < (usec / 1000)) + ; + } else { + for (i = 0; i < (usec * XILINX_CLOCK_FREQ / 10000000); i++) + ; + } +} + +#ifndef CONFIG_SPL_BUILD +static void timer_isr(void *arg) +{ + timestamp++; + tmr->control = tmr->control | TIMER_INTERRUPT; +} + +int timer_init (void) +{ + int irq = -1; + u32 preload = 0; + u32 ret = 0; + +#if defined(CONFIG_SYS_TIMER_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM) + preload = XILINX_CLOCK_FREQ / CONFIG_SYS_HZ; + irq = CONFIG_SYS_TIMER_0_IRQ; + tmr = (microblaze_timer_t *) (CONFIG_SYS_TIMER_0_ADDR); +#endif + + if (tmr && preload && irq >= 0) { + tmr->loadreg = preload; + tmr->control = TIMER_INTERRUPT | TIMER_RESET; + tmr->control = TIMER_ENABLE | TIMER_ENABLE_INTR |\ + TIMER_RELOAD | TIMER_DOWN_COUNT; + timestamp = 0; + ret = install_interrupt_handler (irq, timer_isr, (void *)tmr); + if (ret) + tmr = NULL; + } + /* No problem if timer is not found/initialized */ + return 0; +} +#else +int timer_init(void) +{ + return 0; +} +#endif + +/* + * This function is derived from PowerPC code (read timebase as long long). + * On Microblaze it just returns the timer value. + */ +unsigned long long get_ticks(void) +{ + return get_timer(0); +} + +/* + * This function is derived from PowerPC code (timebase clock frequency). + * On Microblaze it returns the number of timer ticks per second. + */ +ulong get_tbclk(void) +{ + return CONFIG_SYS_HZ; +} |