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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Dirk Behme91eee542008-12-14 09:47:15 +01002/*
3 * (C) Copyright 2008
4 * Texas Instruments
5 *
6 * Richard Woodruff <r-woodruff2@ti.com>
7 * Syed Moahmmed Khasim <khasim@ti.com>
8 *
9 * (C) Copyright 2002
10 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
11 * Marius Groeger <mgroeger@sysgo.de>
12 * Alex Zuepke <azu@sysgo.de>
13 *
14 * (C) Copyright 2002
Detlev Zundel792a09e2009-05-13 10:54:10 +020015 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
Dirk Behme91eee542008-12-14 09:47:15 +010016 */
17
18#include <common.h>
19#include <asm/io.h>
Tom Rini98f92002013-03-14 11:15:25 +000020#include <asm/arch/cpu.h>
Sricharan Rf9b814a2013-05-30 03:19:34 +000021#include <asm/arch/clock.h>
Dirk Behme91eee542008-12-14 09:47:15 +010022
Dirk Behmeb03c8402010-12-11 10:50:48 -050023DECLARE_GLOBAL_DATA_PTR;
24
Dirk Behme97a099e2009-08-08 09:30:21 +020025static struct gptimer *timer_base = (struct gptimer *)CONFIG_SYS_TIMERBASE;
Patrick Delaunay6180ea72018-10-05 11:33:52 +020026static ulong get_timer_masked(void);
Dirk Behme91eee542008-12-14 09:47:15 +010027
Manikandan Pillaid3a513c2009-04-21 17:29:05 +020028/*
29 * Nothing really to do with interrupts, just starts up a counter.
Manikandan Pillaid3a513c2009-04-21 17:29:05 +020030 */
31
John Rigbyaadcfc12010-12-27 14:33:10 +000032#define TIMER_CLOCK (V_SCLK / (2 << CONFIG_SYS_PTV))
33#define TIMER_OVERFLOW_VAL 0xffffffff
34#define TIMER_LOAD_VAL 0
Manikandan Pillaid3a513c2009-04-21 17:29:05 +020035
Jean-Christophe PLAGNIOL-VILLARDb54384e2009-05-15 23:47:02 +020036int timer_init(void)
Dirk Behme91eee542008-12-14 09:47:15 +010037{
38 /* start the counter ticking up, reload value on overflow */
39 writel(TIMER_LOAD_VAL, &timer_base->tldr);
40 /* enable timer */
Ladislav Michl81472d82009-03-30 18:58:41 +020041 writel((CONFIG_SYS_PTV << 2) | TCLR_PRE | TCLR_AR | TCLR_ST,
Dirk Behme91eee542008-12-14 09:47:15 +010042 &timer_base->tclr);
43
Dirk Behme91eee542008-12-14 09:47:15 +010044 return 0;
45}
46
47/*
48 * timer without interrupts
49 */
Dirk Behme91eee542008-12-14 09:47:15 +010050ulong get_timer(ulong base)
51{
52 return get_timer_masked() - base;
53}
54
Manikandan Pillaid3a513c2009-04-21 17:29:05 +020055/* delay x useconds */
Ingo van Lil3eb90ba2009-11-24 14:09:21 +010056void __udelay(unsigned long usec)
Dirk Behme91eee542008-12-14 09:47:15 +010057{
Manikandan Pillaid3a513c2009-04-21 17:29:05 +020058 long tmo = usec * (TIMER_CLOCK / 1000) / 1000;
59 unsigned long now, last = readl(&timer_base->tcrr);
Dirk Behme91eee542008-12-14 09:47:15 +010060
Manikandan Pillaid3a513c2009-04-21 17:29:05 +020061 while (tmo > 0) {
62 now = readl(&timer_base->tcrr);
63 if (last > now) /* count up timer overflow */
John Rigbyaadcfc12010-12-27 14:33:10 +000064 tmo -= TIMER_OVERFLOW_VAL - last + now + 1;
Manikandan Pillaid3a513c2009-04-21 17:29:05 +020065 else
66 tmo -= now - last;
67 last = now;
Dirk Behme91eee542008-12-14 09:47:15 +010068 }
Dirk Behme91eee542008-12-14 09:47:15 +010069}
70
Patrick Delaunay6180ea72018-10-05 11:33:52 +020071static ulong get_timer_masked(void)
Dirk Behme91eee542008-12-14 09:47:15 +010072{
Manikandan Pillaid3a513c2009-04-21 17:29:05 +020073 /* current tick value */
74 ulong now = readl(&timer_base->tcrr) / (TIMER_CLOCK / CONFIG_SYS_HZ);
Dirk Behme91eee542008-12-14 09:47:15 +010075
Simon Glass582601d2012-12-13 20:48:35 +000076 if (now >= gd->arch.lastinc) { /* normal mode (non roll) */
Dirk Behme91eee542008-12-14 09:47:15 +010077 /* move stamp fordward with absoulte diff ticks */
Simon Glass582601d2012-12-13 20:48:35 +000078 gd->arch.tbl += (now - gd->arch.lastinc);
Simon Glass66ee6922012-12-13 20:48:34 +000079 } else { /* we have rollover of incrementer */
Daniel Gorsulowski85a2f772016-06-06 09:40:11 +020080 gd->arch.tbl += ((TIMER_OVERFLOW_VAL / (TIMER_CLOCK /
Simon Glass582601d2012-12-13 20:48:35 +000081 CONFIG_SYS_HZ)) - gd->arch.lastinc) + now;
Simon Glass66ee6922012-12-13 20:48:34 +000082 }
Simon Glass582601d2012-12-13 20:48:35 +000083 gd->arch.lastinc = now;
Simon Glass66ee6922012-12-13 20:48:34 +000084 return gd->arch.tbl;
Dirk Behme91eee542008-12-14 09:47:15 +010085}
86
Dirk Behme91eee542008-12-14 09:47:15 +010087/*
88 * This function is derived from PowerPC code (read timebase as long long).
89 * On ARM it just returns the timer value.
90 */
91unsigned long long get_ticks(void)
92{
93 return get_timer(0);
94}
95
96/*
97 * This function is derived from PowerPC code (timebase clock frequency).
98 * On ARM it returns the number of timer ticks per second.
99 */
100ulong get_tbclk(void)
101{
Manikandan Pillaid3a513c2009-04-21 17:29:05 +0200102 return CONFIG_SYS_HZ;
Dirk Behme91eee542008-12-14 09:47:15 +0100103}