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ARM: convert arm to arch_gettimeoffset()

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Convert arm to use GENERIC_TIME via the arch_getoffset() infrastructure,
reducing the amount of arch specific code we need to maintain.

The arm architecture is the last arch that need to be converted.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
John Stultz 2010-03-24 00:22:36 +00:00 committed by Russell King
parent e4bf5beccc
commit 5cfc8ee0bb
4 changed files with 31 additions and 65 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/arm/Kconfig
View File

@ -42,6 +42,11 @@ config GENERIC_GPIO
config GENERIC_TIME
bool
default y
config ARCH_USES_GETTIMEOFFSET
bool
default n
config GENERIC_CLOCKEVENTS
bool
@ -231,6 +236,7 @@ config ARCH_AAEC2000
select CPU_ARM920T
select ARM_AMBA
select HAVE_CLK
select ARCH_USES_GETTIMEOFFSET
help
This enables support for systems based on the Agilent AAEC-2000
@ -271,6 +277,7 @@ config ARCH_AT91
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
select HAVE_CLK
select ARCH_USES_GETTIMEOFFSET
help
This enables support for systems based on the Atmel AT91RM9200,
AT91SAM9 and AT91CAP9 processors.
@ -290,6 +297,7 @@ config ARCH_BCMRING
config ARCH_CLPS711X
bool "Cirrus Logic CLPS711x/EP721x-based"
select CPU_ARM720T
select ARCH_USES_GETTIMEOFFSET
help
Support for Cirrus Logic 711x/721x based boards.
@ -298,6 +306,7 @@ config ARCH_GEMINI
select CPU_FA526
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
select ARCH_USES_GETTIMEOFFSET
help
Support for the Cortina Systems Gemini family SoCs
@ -306,6 +315,7 @@ config ARCH_EBSA110
select CPU_SA110
select ISA
select NO_IOPORT
select ARCH_USES_GETTIMEOFFSET
help
This is an evaluation board for the StrongARM processor available
from Digital. It has limited hardware on-board, including an
@ -321,6 +331,7 @@ config ARCH_EP93XX
select COMMON_CLKDEV
select ARCH_REQUIRE_GPIOLIB
select ARCH_HAS_HOLES_MEMORYMODEL
select ARCH_USES_GETTIMEOFFSET
help
This enables support for the Cirrus EP93xx series of CPUs.
@ -328,6 +339,7 @@ config ARCH_FOOTBRIDGE
bool "FootBridge"
select CPU_SA110
select FOOTBRIDGE
select ARCH_USES_GETTIMEOFFSET
help
Support for systems based on the DC21285 companion chip
("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
@ -366,6 +378,7 @@ config ARCH_H720X
bool "Hynix HMS720x-based"
select CPU_ARM720T
select ISA_DMA_API
select ARCH_USES_GETTIMEOFFSET
help
This enables support for systems based on the Hynix HMS720x
@ -408,6 +421,7 @@ config ARCH_IXP23XX
depends on MMU
select CPU_XSC3
select PCI
select ARCH_USES_GETTIMEOFFSET
help
Support for Intel's IXP23xx (XScale) family of processors.
@ -416,6 +430,7 @@ config ARCH_IXP2000
depends on MMU
select CPU_XSCALE
select PCI
select ARCH_USES_GETTIMEOFFSET
help
Support for Intel's IXP2400/2800 (XScale) family of processors.
@ -434,6 +449,7 @@ config ARCH_L7200
bool "LinkUp-L7200"
select CPU_ARM720T
select FIQ
select ARCH_USES_GETTIMEOFFSET
help
Say Y here if you intend to run this kernel on a LinkUp Systems
L7200 Software Development Board which uses an ARM720T processor.
@ -523,6 +539,7 @@ config ARCH_KS8695
select CPU_ARM922T
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
select ARCH_USES_GETTIMEOFFSET
help
Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
System-on-Chip devices.
@ -569,6 +586,7 @@ config ARCH_PNX4008
bool "Philips Nexperia PNX4008 Mobile"
select CPU_ARM926T
select COMMON_CLKDEV
select ARCH_USES_GETTIMEOFFSET
help
This enables support for Philips PNX4008 mobile platform.
@ -613,6 +631,7 @@ config ARCH_RPC
select ISA_DMA_API
select NO_IOPORT
select ARCH_SPARSEMEM_ENABLE
select ARCH_USES_GETTIMEOFFSET
help
On the Acorn Risc-PC, Linux can support the internal IDE disk and
CD-ROM interface, serial and parallel port, and the floppy drive.
@ -639,6 +658,7 @@ config ARCH_S3C2410
select GENERIC_GPIO
select ARCH_HAS_CPUFREQ
select HAVE_CLK
select ARCH_USES_GETTIMEOFFSET
help
Samsung S3C2410X CPU based systems, such as the Simtec Electronics
BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
@ -652,6 +672,7 @@ config ARCH_S3C64XX
select ARM_VIC
select HAVE_CLK
select NO_IOPORT
select ARCH_USES_GETTIMEOFFSET
select ARCH_HAS_CPUFREQ
select ARCH_REQUIRE_GPIOLIB
select SAMSUNG_CLKSRC
@ -708,6 +729,7 @@ config ARCH_SHARK
select ISA_DMA
select ZONE_DMA
select PCI
select ARCH_USES_GETTIMEOFFSET
help
Support for the StrongARM based Digital DNARD machine, also known
as "Shark" (<http://www.shark-linux.de/shark.html>).
@ -717,6 +739,7 @@ config ARCH_LH7A40X
select CPU_ARM922T
select ARCH_DISCONTIGMEM_ENABLE if !LH7A40X_CONTIGMEM
select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
select ARCH_USES_GETTIMEOFFSET
help
Say Y here for systems based on one of the Sharp LH7A40X
System on a Chip processors. These CPUs include an ARM922T

2
arch/arm/include/asm/mach/time.h
View File

@ -38,7 +38,7 @@ struct sys_timer {
void (*init)(void);
void (*suspend)(void);
void (*resume)(void);
#ifndef CONFIG_GENERIC_TIME
#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
unsigned long (*offset)(void);
#endif
};

70
arch/arm/kernel/time.c
View File

@ -72,12 +72,15 @@ unsigned long profile_pc(struct pt_regs *regs)
EXPORT_SYMBOL(profile_pc);
#endif
#ifndef CONFIG_GENERIC_TIME
static unsigned long dummy_gettimeoffset(void)
#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
u32 arch_gettimeoffset(void)
{
if (system_timer->offset != NULL)
return system_timer->offset() * 1000;
return 0;
}
#endif
#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
#ifdef CONFIG_LEDS_TIMER
static inline void do_leds(void)
@ -93,63 +96,6 @@ static inline void do_leds(void)
#define do_leds()
#endif
#ifndef CONFIG_GENERIC_TIME
void do_gettimeofday(struct timeval *tv)
{
unsigned long flags;
unsigned long seq;
unsigned long usec, sec;
do {
seq = read_seqbegin_irqsave(&xtime_lock, flags);
usec = system_timer->offset();
sec = xtime.tv_sec;
usec += xtime.tv_nsec / 1000;
} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
/* usec may have gone up a lot: be safe */
while (usec >= 1000000) {
usec -= 1000000;
sec++;
}
tv->tv_sec = sec;
tv->tv_usec = usec;
}
EXPORT_SYMBOL(do_gettimeofday);
int do_settimeofday(struct timespec *tv)
{
time_t wtm_sec, sec = tv->tv_sec;
long wtm_nsec, nsec = tv->tv_nsec;
if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
return -EINVAL;
write_seqlock_irq(&xtime_lock);
/*
* This is revolting. We need to set "xtime" correctly. However, the
* value in this location is the value at the most recent update of
* wall time. Discover what correction gettimeofday() would have
* done, and then undo it!
*/
nsec -= system_timer->offset() * NSEC_PER_USEC;
wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
set_normalized_timespec(&xtime, sec, nsec);
set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
ntp_clear();
write_sequnlock_irq(&xtime_lock);
clock_was_set();
return 0;
}
EXPORT_SYMBOL(do_settimeofday);
#endif /* !CONFIG_GENERIC_TIME */
#ifndef CONFIG_GENERIC_CLOCKEVENTS
/*
@ -214,10 +160,6 @@ device_initcall(timer_init_sysfs);
void __init time_init(void)
{
#ifndef CONFIG_GENERIC_TIME
if (system_timer->offset == NULL)
system_timer->offset = dummy_gettimeoffset;
#endif
system_timer->init();
}

1
arch/arm/mach-at91/Kconfig
View File

@ -97,6 +97,7 @@ config ARCH_AT572D940HF
config ARCH_AT91X40
bool "AT91x40"
select ARCH_USES_GETTIMEOFFSET
endchoice