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arm: pxa: use common timer functions 

This patch moves pxa to the common timer functions added in commit

  8dfafdd - Introduce common timer functions <Rob Herring>

The (removed) pxa timer code (specifically __udelay()) could deadlock at
the 32-bit boundary of get_ticks().  get_ticks() returned a 32-bit value
cast up to a 64-bit value.  If get_ticks() + tmo in __udelay() crossed
the 32-bit boundary, the while condition became unconditionally true and
locked the processor.  Rather than patch the specific pxa issues, simply
move everything over to the common code.

Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Tom Rini <trini@konsuiko.com>
This commit is contained in:
Andrew Ruder 2015-08-12 13:18:31 -05:00 committed by Marek Vasut
parent 07a8e6d6ee
commit 7d211fec96
3 changed files with 30 additions and 69 deletions
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69
arch/arm/cpu/pxa/timer.c
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@ -6,80 +6,13 @@
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm/arch/pxa-regs.h>
#include <asm/io.h>
#include <common.h>
#include <div64.h>
DECLARE_GLOBAL_DATA_PTR;
#define TIMER_LOAD_VAL 0xffffffff
#define timestamp (gd->arch.tbl)
#define lastinc (gd->arch.lastinc)
#if defined(CONFIG_CPU_PXA27X) || defined(CONFIG_CPU_MONAHANS)
#define TIMER_FREQ_HZ 3250000
#elif defined(CONFIG_CPU_PXA25X)
#define TIMER_FREQ_HZ 3686400
#else
#error "Timer frequency unknown - please config PXA CPU type"
#endif
static unsigned long long tick_to_time(unsigned long long tick)
{
return lldiv(tick * CONFIG_SYS_HZ, TIMER_FREQ_HZ);
}
static unsigned long long us_to_tick(unsigned long long us)
{
return lldiv(us * TIMER_FREQ_HZ, 1000000);
}
int timer_init(void)
{
writel(0, OSCR);
writel(0, CONFIG_SYS_TIMER_COUNTER);
return 0;
}
unsigned long long get_ticks(void)
{
/* Current tick value */
uint32_t now = readl(OSCR);
if (now >= lastinc) {
/*
* Normal mode (non roll)
* Move stamp forward with absolute diff ticks
*/
timestamp += (now - lastinc);
} else {
/* We have rollover of incrementer */
timestamp += (TIMER_LOAD_VAL - lastinc) + now;
}
lastinc = now;
return timestamp;
}
ulong get_timer(ulong base)
{
return tick_to_time(get_ticks()) - base;
}
void __udelay(unsigned long usec)
{
unsigned long long tmp;
ulong tmo;
tmo = us_to_tick(usec);
tmp = get_ticks() + tmo; /* get current timestamp */
while (get_ticks() < tmp) /* loop till event */
/*NOP*/;
}
ulong get_tbclk(void)
{
return TIMER_FREQ_HZ;
}

25
arch/arm/include/asm/arch-pxa/config.h Normal file
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@ -0,0 +1,25 @@
/*
* Copyright (C) 2014 Andrew Ruder <andrew.ruder@elecsyscorp.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _ASM_ARM_PXA_CONFIG_
#define _ASM_ARM_PXA_CONFIG_
#include <asm/arch/pxa-regs.h>
/*
* Generic timer support
*/
#if defined(CONFIG_CPU_PXA27X) || defined(CONFIG_CPU_MONAHANS)
#define CONFIG_SYS_TIMER_RATE 3250000
#elif defined(CONFIG_CPU_PXA25X)
#define CONFIG_SYS_TIMER_RATE 3686400
#else
#error "Timer frequency unknown - please config PXA CPU type"
#endif
#define CONFIG_SYS_TIMER_COUNTER OSCR
#endif /* _ASM_ARM_PXA_CONFIG_ */

5
arch/arm/include/asm/config.h
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@ -19,7 +19,10 @@
#include <asm/arch-fsl-lsch3/config.h>
#endif
#ifdef CONFIG_LS102XA
#if defined(CONFIG_LS102XA) || \
defined(CONFIG_CPU_PXA27X) || \
defined(CONFIG_CPU_MONAHANS) || \
defined(CONFIG_CPU_PXA25X)
#include <asm/arch/config.h>
#endif