| /* |
| * (C) Copyright 2009 Faraday Technology |
| * Po-Yu Chuang <ratbert@faraday-tech.com> |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <div64.h> |
| #include <asm/io.h> |
| #include <faraday/ftpmu010.h> |
| #include <faraday/fttmr010.h> |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| #define TIMER_CLOCK 32768 |
| #define TIMER_LOAD_VAL 0xffffffff |
| |
| static inline unsigned long long tick_to_time(unsigned long long tick) |
| { |
| tick *= CONFIG_SYS_HZ; |
| do_div(tick, gd->arch.timer_rate_hz); |
| |
| return tick; |
| } |
| |
| static inline unsigned long long usec_to_tick(unsigned long long usec) |
| { |
| usec *= gd->arch.timer_rate_hz; |
| do_div(usec, 1000000); |
| |
| return usec; |
| } |
| |
| int timer_init(void) |
| { |
| struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE; |
| unsigned int cr; |
| |
| debug("%s()\n", __func__); |
| |
| /* disable timers */ |
| writel(0, &tmr->cr); |
| |
| /* use 32768Hz oscillator for RTC, WDT, TIMER */ |
| ftpmu010_32768osc_enable(); |
| |
| /* setup timer */ |
| writel(TIMER_LOAD_VAL, &tmr->timer3_load); |
| writel(TIMER_LOAD_VAL, &tmr->timer3_counter); |
| writel(0, &tmr->timer3_match1); |
| writel(0, &tmr->timer3_match2); |
| |
| /* we don't want timer to issue interrupts */ |
| writel(FTTMR010_TM3_MATCH1 | |
| FTTMR010_TM3_MATCH2 | |
| FTTMR010_TM3_OVERFLOW, |
| &tmr->interrupt_mask); |
| |
| cr = readl(&tmr->cr); |
| cr |= FTTMR010_TM3_CLOCK; /* use external clock */ |
| cr |= FTTMR010_TM3_ENABLE; |
| writel(cr, &tmr->cr); |
| |
| gd->arch.timer_rate_hz = TIMER_CLOCK; |
| gd->arch.tbu = gd->arch.tbl = 0; |
| |
| return 0; |
| } |
| |
| /* |
| * Get the current 64 bit timer tick count |
| */ |
| unsigned long long get_ticks(void) |
| { |
| struct fttmr010 *tmr = (struct fttmr010 *)CONFIG_FTTMR010_BASE; |
| ulong now = TIMER_LOAD_VAL - readl(&tmr->timer3_counter); |
| |
| /* increment tbu if tbl has rolled over */ |
| if (now < gd->arch.tbl) |
| gd->arch.tbu++; |
| gd->arch.tbl = now; |
| return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl; |
| } |
| |
| void __udelay(unsigned long usec) |
| { |
| unsigned long long start; |
| ulong tmo; |
| |
| start = get_ticks(); /* get current timestamp */ |
| tmo = usec_to_tick(usec); /* convert usecs to ticks */ |
| while ((get_ticks() - start) < tmo) |
| ; /* loop till time has passed */ |
| } |
| |
| /* |
| * get_timer(base) can be used to check for timeouts or |
| * to measure elasped time relative to an event: |
| * |
| * ulong start_time = get_timer(0) sets start_time to the current |
| * time value. |
| * get_timer(start_time) returns the time elapsed since then. |
| * |
| * The time is used in CONFIG_SYS_HZ units! |
| */ |
| ulong get_timer(ulong base) |
| { |
| return tick_to_time(get_ticks()) - base; |
| } |
| |
| /* |
| * Return the number of timer ticks per second. |
| */ |
| ulong get_tbclk(void) |
| { |
| return gd->arch.timer_rate_hz; |
| } |