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98 lines
3.2 KiB
C
98 lines
3.2 KiB
C
/*
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* Copyright (c) 2011, Anup Patel. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. No personal names or organizations' names associated with the
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* Atomthreads project may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE ATOMTHREADS PROJECT AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <atom.h>
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#include <atomport.h>
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#include <arm_io.h>
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#include <arm_irq.h>
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#include <arm_config.h>
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#include <arm_plat.h>
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#include <arm_timer.h>
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unsigned long long jiffies;
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void arm_timer_enable(void)
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{
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uint32_t ctrl;
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ctrl = arm_readl((void *)(REALVIEW_PBA8_TIMER0_1_BASE + TIMER_CTRL));
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ctrl |= TIMER_CTRL_ENABLE;
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arm_writel(ctrl, (void *)(REALVIEW_PBA8_TIMER0_1_BASE + TIMER_CTRL));
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}
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void arm_timer_disable(void)
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{
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uint32_t ctrl;
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ctrl = arm_readl((void *)(REALVIEW_PBA8_TIMER0_1_BASE + TIMER_CTRL));
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ctrl &= ~TIMER_CTRL_ENABLE;
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arm_writel(ctrl, (void *)(REALVIEW_PBA8_TIMER0_1_BASE + TIMER_CTRL));
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}
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void arm_timer_clearirq(void)
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{
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arm_writel(1, (void *)(REALVIEW_PBA8_TIMER0_1_BASE + TIMER_INTCLR));
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}
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int arm_timer_irqhndl(uint32_t irq_no, pt_regs_t * regs)
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{
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/* Call the OS system tick handler */
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atomTimerTick();
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arm_timer_clearirq();
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return 0;
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}
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int arm_timer_init(uint32_t ticks_per_sec)
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{
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uint32_t val;
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/*
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* set clock frequency:
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* REALVIEW_TIMCLK is 1MHz
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*/
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val = arm_readl((void *)REALVIEW_SCTL_BASE) | (REALVIEW_TIMCLK << 0x1);
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arm_writel(val, (void *)REALVIEW_SCTL_BASE);
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/* Register interrupt handler */
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arm_irq_register(IRQ_PBA8_TIMER0_1, &arm_timer_irqhndl);
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val = arm_readl((void *)(REALVIEW_PBA8_TIMER0_1_BASE + TIMER_CTRL));
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val &= ~TIMER_CTRL_ENABLE;
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val |= (TIMER_CTRL_32BIT | TIMER_CTRL_PERIODIC | TIMER_CTRL_IE);
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arm_writel(val, (void *)(REALVIEW_PBA8_TIMER0_1_BASE + TIMER_CTRL));
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arm_writel((1000000 / ticks_per_sec),
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(void *)(REALVIEW_PBA8_TIMER0_1_BASE + TIMER_LOAD));
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arm_writel((1000000 / ticks_per_sec),
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(void *)(REALVIEW_PBA8_TIMER0_1_BASE + TIMER_VALUE));
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return 0;
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}
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