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Diffstat (limited to 'board/zinger/runtime.c')
-rw-r--r-- | board/zinger/runtime.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/board/zinger/runtime.c b/board/zinger/runtime.c new file mode 100644 index 0000000000..24558693db --- /dev/null +++ b/board/zinger/runtime.c @@ -0,0 +1,96 @@ +/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ +/* tiny substitute of the runtime layer */ + +#include "common.h" +#include "cpu.h" +#include "debug.h" +#include "irq_handler.h" +#include "registers.h" +#include "timer.h" +#include "util.h" + +volatile uint32_t last_event; + +timestamp_t get_time(void) +{ + timestamp_t t; + + t.le.lo = STM32_TIM32_CNT(2); + t.le.hi = 0; + return t; +} + +void udelay(unsigned us) +{ + unsigned t0 = STM32_TIM32_CNT(2); + while ((STM32_TIM32_CNT(2) - t0) < us) + ; +} + +void task_enable_irq(int irq) +{ + CPU_NVIC_EN(0) = 1 << irq; +} + +void task_disable_irq(int irq) +{ + CPU_NVIC_DIS(0) = 1 << irq; +} + +void task_clear_pending_irq(int irq) +{ + CPU_NVIC_UNPEND(0) = 1 << irq; +} + +uint32_t task_set_event(task_id_t tskid, uint32_t event, int wait) +{ + last_event = event; + + return 0; +} + +void IRQ_HANDLER(STM32_IRQ_TIM2)(void) +{ + STM32_TIM_DIER(2) = 0; /* disable match interrupt */ + task_clear_pending_irq(STM32_IRQ_TIM2); + last_event = 1 << 29 /* task event wake */; +} + +uint32_t task_wait_event(int timeout_us) +{ + uint32_t evt; + + /* the event already happened */ + if (last_event || !timeout_us) { + evt = last_event; + last_event = 0; + + return evt; + } + + /* set timeout on timer */ + if (timeout_us > 0) { + STM32_TIM32_CCR1(2) = STM32_TIM32_CNT(2) + timeout_us; + STM32_TIM_SR(2) = 0; /* clear match flag */ + STM32_TIM_DIER(2) = 2; /* match interrupt */ + } + + /* sleep until next interrupt */ + asm volatile("wfi"); + + STM32_TIM_DIER(2) = 0; /* disable match interrupt */ + evt = last_event; + last_event = 0; + + return evt; +} + +/* --- stubs --- */ +void __hw_timer_enable_clock(int n, int enable) +{ /* Done in hardware init */ } + +void usleep(unsigned us) +{ /* Used only as a workaround */ } |