114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/*
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* (C) Copyright 2007-2011
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* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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* Tom Cubie <tangliang@allwinnertech.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/timer.h>
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DECLARE_GLOBAL_DATA_PTR;
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#define TIMER_MODE (0x0 << 7) /* continuous mode */
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#define TIMER_DIV (0x0 << 4) /* pre scale 1 */
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#define TIMER_SRC (0x1 << 2) /* osc24m */
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#define TIMER_RELOAD (0x1 << 1) /* reload internal value */
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#define TIMER_EN (0x1 << 0) /* enable timer */
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#define TIMER_CLOCK (24 * 1000 * 1000)
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#define COUNT_TO_USEC(x) ((x) / 24)
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#define USEC_TO_COUNT(x) ((x) * 24)
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#define TICKS_PER_HZ (TIMER_CLOCK / CONFIG_SYS_HZ)
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#define TICKS_TO_HZ(x) ((x) / TICKS_PER_HZ)
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#define TIMER_LOAD_VAL 0xffffffff
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#define TIMER_NUM 0 /* we use timer 0 */
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/* read the 32-bit timer */
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static ulong read_timer(void)
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{
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struct sunxi_timer_reg *timers =
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(struct sunxi_timer_reg *)SUNXI_TIMER_BASE;
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struct sunxi_timer *timer = &timers->timer[TIMER_NUM];
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/*
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* The hardware timer counts down, therefore we invert to
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* produce an incrementing timer.
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*/
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return ~readl(&timer->val);
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}
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/* init timer register */
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int timer_init(void)
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{
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struct sunxi_timer_reg *timers =
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(struct sunxi_timer_reg *)SUNXI_TIMER_BASE;
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struct sunxi_timer *timer = &timers->timer[TIMER_NUM];
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writel(TIMER_LOAD_VAL, &timer->inter);
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writel(TIMER_MODE | TIMER_DIV | TIMER_SRC | TIMER_RELOAD | TIMER_EN,
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&timer->ctl);
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return 0;
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}
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/* timer without interrupts */
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ulong get_timer(ulong base)
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{
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return get_timer_masked() - base;
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}
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ulong get_timer_masked(void)
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{
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/* current tick value */
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ulong now = TICKS_TO_HZ(read_timer());
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if (now >= gd->arch.lastinc) /* normal (non rollover) */
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gd->arch.tbl += (now - gd->arch.lastinc);
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else {
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/* rollover */
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gd->arch.tbl += (TICKS_TO_HZ(TIMER_LOAD_VAL)
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- gd->arch.lastinc) + now;
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}
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gd->arch.lastinc = now;
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return gd->arch.tbl;
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}
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/* delay x useconds */
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void __udelay(unsigned long usec)
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{
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long tmo = USEC_TO_COUNT(usec);
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ulong now, last = read_timer();
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while (tmo > 0) {
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now = read_timer();
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if (now > last) /* normal (non rollover) */
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tmo -= now - last;
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else /* rollover */
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tmo -= TIMER_LOAD_VAL - last + now;
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last = now;
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}
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This function is derived from PowerPC code (timebase clock frequency).
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* On ARM it returns the number of timer ticks per second.
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*/
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ulong get_tbclk(void)
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{
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return CONFIG_SYS_HZ;
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}
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