projects / thirdparty / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 83d290c5 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
| 24e8bee5 AW |
2 | /* |
| 3 | * Copyright 2013 Freescale Semiconductor, Inc. | |
| 24e8bee5 AW |
4 | */ |
| 5 | ||
| d678a59d | 6 | #include <common.h> |
| 691d719d | 7 | #include <init.h> |
| 1045315d | 8 | #include <time.h> |
| 401d1c4f | 9 | #include <asm/global_data.h> |
| 24e8bee5 AW |
10 | #include <asm/io.h> |
| 11 | #include <div64.h> | |
| 12 | #include <asm/arch/imx-regs.h> | |
| 13 | #include <asm/arch/clock.h> | |
| c05ed00a | 14 | #include <linux/delay.h> |
| 24e8bee5 AW |
15 | |
| 16 | static struct pit_reg *cur_pit = (struct pit_reg *)PIT_BASE_ADDR; | |
| 17 | ||
| 18 | DECLARE_GLOBAL_DATA_PTR; | |
| 19 | ||
| 20 | #define TIMER_LOAD_VAL 0xffffffff | |
| 21 | ||
| 22 | static inline unsigned long long tick_to_time(unsigned long long tick) | |
| 23 | { | |
| 24 | tick *= CONFIG_SYS_HZ; | |
| 25 | do_div(tick, mxc_get_clock(MXC_IPG_CLK)); | |
| 26 | ||
| 27 | return tick; | |
| 28 | } | |
| 29 | ||
| 30 | static inline unsigned long long us_to_tick(unsigned long long usec) | |
| 31 | { | |
| 32 | usec = usec * mxc_get_clock(MXC_IPG_CLK) + 999999; | |
| 33 | do_div(usec, 1000000); | |
| 34 | ||
| 35 | return usec; | |
| 36 | } | |
| 37 | ||
| 38 | int timer_init(void) | |
| 39 | { | |
| 40 | __raw_writel(0, &cur_pit->mcr); | |
| 41 | ||
| 42 | __raw_writel(TIMER_LOAD_VAL, &cur_pit->ldval1); | |
| 43 | __raw_writel(0, &cur_pit->tctrl1); | |
| 44 | __raw_writel(1, &cur_pit->tctrl1); | |
| 45 | ||
| 46 | gd->arch.tbl = 0; | |
| 47 | gd->arch.tbu = 0; | |
| 48 | ||
| 49 | return 0; | |
| 50 | } | |
| 51 | ||
| 52 | unsigned long long get_ticks(void) | |
| 53 | { | |
| 54 | ulong now = TIMER_LOAD_VAL - __raw_readl(&cur_pit->cval1); | |
| 55 | ||
| 56 | /* increment tbu if tbl has rolled over */ | |
| 57 | if (now < gd->arch.tbl) | |
| 58 | gd->arch.tbu++; | |
| 59 | gd->arch.tbl = now; | |
| 60 | ||
| 61 | return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl; | |
| 62 | } | |
| 63 | ||
| 24e8bee5 AW |
64 | ulong get_timer(ulong base) |
| 65 | { | |
| 6180ea7e | 66 | return tick_to_time(get_ticks()) - base; |
| 24e8bee5 AW |
67 | } |
| 68 | ||
| 69 | /* delay x useconds AND preserve advance timstamp value */ | |
| 70 | void __udelay(unsigned long usec) | |
| 71 | { | |
| 72 | unsigned long long start; | |
| 73 | ulong tmo; | |
| 74 | ||
| 75 | start = get_ticks(); /* get current timestamp */ | |
| 76 | tmo = us_to_tick(usec); /* convert usecs to ticks */ | |
| 77 | while ((get_ticks() - start) < tmo) | |
| 78 | ; /* loop till time has passed */ | |
| 79 | } | |
| 80 | ||
| 81 | /* | |
| 82 | * This function is derived from PowerPC code (timebase clock frequency). | |
| 83 | * On ARM it returns the number of timer ticks per second. | |
| 84 | */ | |
| 85 | ulong get_tbclk(void) | |
| 86 | { | |
| 87 | return mxc_get_clock(MXC_IPG_CLK); | |
| 88 | } |