| /* |
| * Copyright 2013 Freescale Semiconductor, Inc. |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <common.h> |
| #include <asm/io.h> |
| #include <div64.h> |
| #include <asm/arch/imx-regs.h> |
| #include <asm/arch/clock.h> |
| |
| static struct pit_reg *cur_pit = (struct pit_reg *)PIT_BASE_ADDR; |
| |
| DECLARE_GLOBAL_DATA_PTR; |
| |
| #define TIMER_LOAD_VAL 0xffffffff |
| |
| static inline unsigned long long tick_to_time(unsigned long long tick) |
| { |
| tick *= CONFIG_SYS_HZ; |
| do_div(tick, mxc_get_clock(MXC_IPG_CLK)); |
| |
| return tick; |
| } |
| |
| static inline unsigned long long us_to_tick(unsigned long long usec) |
| { |
| usec = usec * mxc_get_clock(MXC_IPG_CLK) + 999999; |
| do_div(usec, 1000000); |
| |
| return usec; |
| } |
| |
| int timer_init(void) |
| { |
| __raw_writel(0, &cur_pit->mcr); |
| |
| __raw_writel(TIMER_LOAD_VAL, &cur_pit->ldval1); |
| __raw_writel(0, &cur_pit->tctrl1); |
| __raw_writel(1, &cur_pit->tctrl1); |
| |
| gd->arch.tbl = 0; |
| gd->arch.tbu = 0; |
| |
| return 0; |
| } |
| |
| unsigned long long get_ticks(void) |
| { |
| ulong now = TIMER_LOAD_VAL - __raw_readl(&cur_pit->cval1); |
| |
| /* 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; |
| } |
| |
| ulong get_timer_masked(void) |
| { |
| return tick_to_time(get_ticks()); |
| } |
| |
| ulong get_timer(ulong base) |
| { |
| return get_timer_masked() - base; |
| } |
| |
| /* delay x useconds AND preserve advance timstamp value */ |
| void __udelay(unsigned long usec) |
| { |
| unsigned long long start; |
| ulong tmo; |
| |
| start = get_ticks(); /* get current timestamp */ |
| tmo = us_to_tick(usec); /* convert usecs to ticks */ |
| while ((get_ticks() - start) < tmo) |
| ; /* loop till time has passed */ |
| } |
| |
| /* |
| * 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 mxc_get_clock(MXC_IPG_CLK); |
| } |