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Date: Tue, 14 Apr 2009 18:41:08 -0700
From: john stultz <johnstul@...ibm.com>
To: lkml <linux-kernel@...r.kernel.org>
Cc: rmk+lkml@....linux.org.uk, cooloney@...nel.org, starvik@...s.com,
takata@...ux-m32r.org, geert@...ux-m68k.org,
Roman Zippel <zippel@...ux-m68k.org>, lethal@...ux-sh.org,
Magnus Damm <magnus.damm@...il.com>, wli@...omorphy.com,
rth@...ddle.net
Subject: [RFC][PATCH 2/8] Convert arm to use arch_getoffset()
infrastructure.
This patch converts arm to use GENERIC_TIME via the arch_getoffset()
infrastructure
I do not have cross compilers for these architectures, and in some cases
the architectures can be compiles both with and without clocksources. So
I've taken my best swing at converting this, but I'm not confident I got
it right. Any assistance from arch maintainers or testers would be
great.
NOT FOR INCLUSION
Signed-off-by: John Stultz <johnstul@...ibm.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e02b893..61c88e1 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -38,7 +38,7 @@ config GENERIC_GPIO
config GENERIC_TIME
bool
- default n
+ default y
config GENERIC_CLOCKEVENTS
bool
@@ -203,6 +203,7 @@ 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
@@ -212,6 +213,7 @@ config ARCH_INTEGRATOR
select HAVE_CLK
select COMMON_CLKDEV
select ICST525
+ select ARCH_USES_GETTIMEOFFSET
help
Support for ARM's Integrator platform.
@@ -221,7 +223,6 @@ config ARCH_REALVIEW
select HAVE_CLK
select COMMON_CLKDEV
select ICST307
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
help
This enables support for ARM Ltd RealView boards.
@@ -233,7 +234,6 @@ config ARCH_VERSATILE
select HAVE_CLK
select COMMON_CLKDEV
select ICST307
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
help
This enables support for ARM Ltd Versatile board.
@@ -243,6 +243,7 @@ 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.
@@ -258,6 +259,7 @@ 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
@@ -273,6 +275,7 @@ config ARCH_EP93XX
select HAVE_CLK
select COMMON_CLKDEV
select ARCH_REQUIRE_GPIOLIB
+ select ARCH_USES_GETTIMEOFFSET
help
This enables support for the Cirrus EP93xx series of CPUs.
@@ -288,6 +291,7 @@ 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.
@@ -297,7 +301,6 @@ config ARCH_NETX
select CPU_ARM926T
select ARM_VIC
select GENERIC_CLOCKEVENTS
- select GENERIC_TIME
help
This enables support for systems based on the Hilscher NetX Soc
@@ -305,6 +308,7 @@ 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
@@ -312,7 +316,6 @@ config ARCH_IMX
bool "IMX"
select CPU_ARM920T
select GENERIC_GPIO
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
help
Support for Motorola's i.MX family of processors (MX1, MXL).
@@ -325,6 +328,7 @@ config ARCH_IOP13XX
select PCI
select ARCH_SUPPORTS_MSI
select VMSPLIT_1G
+ select ARCH_USES_GETTIMEOFFSET
help
Support for Intel's IOP13XX (XScale) family of processors.
@@ -336,6 +340,7 @@ config ARCH_IOP32X
select PCI
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
+ select ARCH_USES_GETTIMEOFFSET
help
Support for Intel's 80219 and IOP32X (XScale) family of
processors.
@@ -348,6 +353,7 @@ config ARCH_IOP33X
select PCI
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
+ select ARCH_USES_GETTIMEOFFSET
help
Support for Intel's IOP33X (XScale) family of processors.
@@ -356,6 +362,7 @@ 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.
@@ -364,6 +371,7 @@ 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.
@@ -372,7 +380,6 @@ config ARCH_IXP4XX
depends on MMU
select CPU_XSCALE
select GENERIC_GPIO
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select DMABOUNCE if PCI
help
@@ -382,6 +389,7 @@ 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.
@@ -397,7 +405,6 @@ config ARCH_KIRKWOOD
select CPU_FEROCEON
select PCI
select GENERIC_GPIO
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select PLAT_ORION
help
@@ -409,6 +416,7 @@ 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.
@@ -417,7 +425,6 @@ config ARCH_NS9XXX
bool "NetSilicon NS9xxx"
select CPU_ARM926T
select GENERIC_GPIO
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select HAVE_CLK
help
@@ -429,7 +436,6 @@ config ARCH_NS9XXX
config ARCH_LOKI
bool "Marvell Loki (88RC8480)"
select CPU_FEROCEON
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select PLAT_ORION
help
@@ -440,7 +446,6 @@ config ARCH_MV78XX0
select CPU_FEROCEON
select PCI
select GENERIC_GPIO
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select PLAT_ORION
help
@@ -449,7 +454,6 @@ config ARCH_MV78XX0
config ARCH_MXC
bool "Freescale MXC/iMX-based"
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select ARCH_MTD_XIP
select GENERIC_GPIO
@@ -463,7 +467,6 @@ config ARCH_ORION5X
select CPU_FEROCEON
select PCI
select GENERIC_GPIO
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select PLAT_ORION
help
@@ -475,6 +478,7 @@ config ARCH_PNX4008
bool "Philips Nexperia PNX4008 Mobile"
select CPU_ARM926T
select HAVE_CLK
+ select ARCH_USES_GETTIMEOFFSET
help
This enables support for Philips PNX4008 mobile platform.
@@ -488,7 +492,6 @@ config ARCH_PXA
select ARCH_REQUIRE_GPIOLIB
select HAVE_CLK
select COMMON_CLKDEV
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select TICK_ONESHOT
select PLAT_PXA
@@ -502,7 +505,6 @@ config ARCH_MMP
select ARCH_REQUIRE_GPIOLIB
select HAVE_CLK
select COMMON_CLKDEV
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select TICK_ONESHOT
select PLAT_PXA
@@ -519,6 +521,7 @@ 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.
@@ -530,7 +533,6 @@ config ARCH_SA1100
select ARCH_SPARSEMEM_ENABLE
select ARCH_MTD_XIP
select GENERIC_GPIO
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select HAVE_CLK
select TICK_ONESHOT
@@ -542,6 +544,7 @@ config ARCH_S3C2410
bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
select GENERIC_GPIO
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
@@ -551,6 +554,7 @@ config ARCH_S3C64XX
bool "Samsung S3C64XX"
select GENERIC_GPIO
select HAVE_CLK
+ select ARCH_USES_GETTIMEOFFSET
help
Samsung S3C64XX series based systems
@@ -561,6 +565,7 @@ 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>).
@@ -570,6 +575,7 @@ 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
@@ -579,7 +585,6 @@ config ARCH_LH7A40X
config ARCH_DAVINCI
bool "TI DaVinci"
select CPU_ARM926T
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
@@ -593,7 +598,6 @@ config ARCH_OMAP
select GENERIC_GPIO
select HAVE_CLK
select ARCH_REQUIRE_GPIOLIB
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
help
Support for TI's OMAP platform (OMAP1 and OMAP2).
@@ -601,7 +605,6 @@ config ARCH_OMAP
config ARCH_MSM
bool "Qualcomm MSM"
select CPU_V6
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
help
Support for Qualcomm MSM7K based systems. This runs on the ARM11
@@ -612,6 +615,7 @@ config ARCH_MSM
config ARCH_W90X900
bool "Nuvoton W90X900 CPU"
select CPU_ARM926T
+ select ARCH_USES_GETTIMEOFFSET
help
Support for Nuvoton (Winbond logic dept.) ARM9 processor,You
can login www.mcuos.com or www.nuvoton.com to know more.
diff --git a/arch/arm/include/asm/mach/time.h b/arch/arm/include/asm/mach/time.h
index b2cc1fc..20c1d84 100644
--- a/arch/arm/include/asm/mach/time.h
+++ b/arch/arm/include/asm/mach/time.h
@@ -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
};
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 4cdc4a0..d9d8d6d 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -81,7 +81,7 @@ EXPORT_SYMBOL(profile_pc);
*/
int (*set_rtc)(void);
-#ifndef CONFIG_GENERIC_TIME
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
static unsigned long dummy_gettimeoffset(void)
{
return 0;
@@ -236,63 +236,12 @@ static inline void do_leds(void)
#define do_leds()
#endif
-#ifndef CONFIG_GENERIC_TIME
-void do_gettimeofday(struct timeval *tv)
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
+u32 arch_gettimeoffset(void)
{
- 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;
+ return system_timer->offset() * 1000;
}
-
-EXPORT_SYMBOL(do_settimeofday);
-#endif /* !CONFIG_GENERIC_TIME */
+#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
/**
* save_time_delta - Save the offset between system time and RTC time
@@ -391,7 +340,7 @@ device_initcall(timer_init_sysfs);
void __init time_init(void)
{
-#ifndef CONFIG_GENERIC_TIME
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
if (system_timer->offset == NULL)
system_timer->offset = dummy_gettimeoffset;
#endif
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 323b47f..e82979c 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -8,47 +8,41 @@ choice
config ARCH_AT91RM9200
bool "AT91RM9200"
select CPU_ARM920T
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
config ARCH_AT91SAM9260
bool "AT91SAM9260 or AT91SAM9XE"
select CPU_ARM926T
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
config ARCH_AT91SAM9261
bool "AT91SAM9261"
select CPU_ARM926T
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
config ARCH_AT91SAM9263
bool "AT91SAM9263"
select CPU_ARM926T
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
config ARCH_AT91SAM9RL
bool "AT91SAM9RL"
select CPU_ARM926T
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
config ARCH_AT91SAM9G20
bool "AT91SAM9G20"
select CPU_ARM926T
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
config ARCH_AT91CAP9
bool "AT91CAP9"
select CPU_ARM926T
- select GENERIC_TIME
select GENERIC_CLOCKEVENTS
config ARCH_AT91X40
bool "AT91x40"
+ select ARCH_USES_GETTIMEOFFSET
endchoice
--
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