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