| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * (C) Copyright 2008 |
| 3 | * Texas Instruments |
| 4 | * |
| 5 | * Richard Woodruff <r-woodruff2@ti.com> |
| 6 | * Syed Moahmmed Khasim <khasim@ti.com> |
| 7 | * |
| 8 | * (C) Copyright 2002 |
| 9 | * Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
| 10 | * Marius Groeger <mgroeger@sysgo.de> |
| 11 | * Alex Zuepke <azu@sysgo.de> |
| 12 | * |
| 13 | * (C) Copyright 2002 |
| 14 | * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> |
| 15 | * |
| 16 | * SPDX-License-Identifier: GPL-2.0+ |
| 17 | */ |
| 18 | |
| 19 | #include <common.h> |
| 20 | #include <asm/io.h> |
| 21 | #include <asm/arch/cpu.h> |
| 22 | #include <asm/arch/clock.h> |
| 23 | |
| 24 | DECLARE_GLOBAL_DATA_PTR; |
| 25 | |
| 26 | static struct gptimer *timer_base = (struct gptimer *)CONFIG_SYS_TIMERBASE; |
| 27 | |
| 28 | /* |
| 29 | * Nothing really to do with interrupts, just starts up a counter. |
| 30 | */ |
| 31 | |
| 32 | #define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV)) |
| 33 | #define TIMER_OVERFLOW_VAL 0xffffffff |
| 34 | #define TIMER_LOAD_VAL 0 |
| 35 | |
| 36 | int timer_init(void) |
| 37 | { |
| 38 | /* start the counter ticking up, reload value on overflow */ |
| 39 | writel(TIMER_LOAD_VAL, &timer_base->tldr); |
| 40 | /* enable timer */ |
| 41 | writel((CONFIG_SYS_PTV << 2) | TCLR_PRE | TCLR_AR | TCLR_ST, |
| 42 | &timer_base->tclr); |
| 43 | |
| 44 | /* reset time, capture current incrementer value time */ |
| 45 | gd->arch.lastinc = readl(&timer_base->tcrr) / |
| 46 | (TIMER_CLOCK / CONFIG_SYS_HZ); |
| 47 | gd->arch.tbl = 0; /* start "advancing" time stamp from 0 */ |
| 48 | |
| 49 | return 0; |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | * timer without interrupts |
| 54 | */ |
| 55 | ulong get_timer(ulong base) |
| 56 | { |
| 57 | return get_timer_masked() - base; |
| 58 | } |
| 59 | |
| 60 | /* delay x useconds */ |
| 61 | void __udelay(unsigned long usec) |
| 62 | { |
| 63 | long tmo = usec * (TIMER_CLOCK / 1000) / 1000; |
| 64 | unsigned long now, last = readl(&timer_base->tcrr); |
| 65 | |
| 66 | while (tmo > 0) { |
| 67 | now = readl(&timer_base->tcrr); |
| 68 | if (last > now) /* count up timer overflow */ |
| 69 | tmo -= TIMER_OVERFLOW_VAL - last + now + 1; |
| 70 | else |
| 71 | tmo -= now - last; |
| 72 | last = now; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | ulong get_timer_masked(void) |
| 77 | { |
| 78 | /* current tick value */ |
| 79 | ulong now = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ); |
| 80 | |
| 81 | if (now >= gd->arch.lastinc) { /* normal mode (non roll) */ |
| 82 | /* move stamp fordward with absoulte diff ticks */ |
| 83 | gd->arch.tbl += (now - gd->arch.lastinc); |
| 84 | } else { /* we have rollover of incrementer */ |
| 85 | gd->arch.tbl += ((TIMER_LOAD_VAL / (TIMER_CLOCK / |
| 86 | CONFIG_SYS_HZ)) - gd->arch.lastinc) + now; |
| 87 | } |
| 88 | gd->arch.lastinc = now; |
| 89 | return gd->arch.tbl; |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * This function is derived from PowerPC code (read timebase as long long). |
| 94 | * On ARM it just returns the timer value. |
| 95 | */ |
| 96 | unsigned long long get_ticks(void) |
| 97 | { |
| 98 | return get_timer(0); |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * This function is derived from PowerPC code (timebase clock frequency). |
| 103 | * On ARM it returns the number of timer ticks per second. |
| 104 | */ |
| 105 | ulong get_tbclk(void) |
| 106 | { |
| 107 | return CONFIG_SYS_HZ; |
| 108 | } |