diff options
author | Andrew Ruder <andrew.ruder@elecsyscorp.com> | 2015-08-12 13:18:31 -0500 |
---|---|---|
committer | Marek Vasut <marex@denx.de> | 2015-08-24 20:30:37 +0200 |
commit | 7d211fec96d1d6b6d828f3bb4abc59180f6e3556 (patch) | |
tree | a10e3e64eb5fd80cbace76d51f2e99179a7c2b51 /arch/arm | |
parent | 07a8e6d6ee04de7c95de9824e3d1821744f92970 (diff) |
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>
Diffstat (limited to 'arch/arm')
-rw-r--r-- | arch/arm/cpu/pxa/timer.c | 69 | ||||
-rw-r--r-- | arch/arm/include/asm/arch-pxa/config.h | 25 | ||||
-rw-r--r-- | arch/arm/include/asm/config.h | 5 |
3 files changed, 30 insertions, 69 deletions
diff --git a/arch/arm/cpu/pxa/timer.c b/arch/arm/cpu/pxa/timer.c index c4717de6a9..11fefd5499 100644 --- a/arch/arm/cpu/pxa/timer.c +++ b/arch/arm/cpu/pxa/timer.c @@ -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; -} diff --git a/arch/arm/include/asm/arch-pxa/config.h b/arch/arm/include/asm/arch-pxa/config.h new file mode 100644 index 0000000000..5836945214 --- /dev/null +++ b/arch/arm/include/asm/arch-pxa/config.h @@ -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_ */ diff --git a/arch/arm/include/asm/config.h b/arch/arm/include/asm/config.h index 7a34a0186c..22fff02778 100644 --- a/arch/arm/include/asm/config.h +++ b/arch/arm/include/asm/config.h @@ -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 |