ARM: convert arm to arch_gettimeoffset()

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>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index bcaa8c8..bf856f4 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -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

diff --git a/arch/arm/include/asm/mach/time.h b/arch/arm/include/asm/mach/time.h
index 8bffc3f..35d408f 100644 (file)
--- 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 2875380..38c261f 100644 (file)
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -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();
 }
 

diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 2db43a5..8a5e8e9 100644 (file)
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -97,6 +97,7 @@ config ARCH_AT572D940HF
 
 config ARCH_AT91X40
        bool "AT91x40"
+       select ARCH_USES_GETTIMEOFFSET
 
 endchoice