From 779e7d41ad004946603da139da99ba775f74cb1c Mon Sep 17 00:00:00 2001 From: Manuel Lauss Date: Sun, 21 Dec 2008 09:26:22 +0100 Subject: [PATCH] MIPS: make cp0 counter clocksource/event usable as fallback. The current mips clock build infrastructure lets a system only use either the MIPS cp0 counter or a SoC specific timer as a clocksource / clockevent device. This patch renames the core cp0 counter clocksource / clockevent functions from mips_* to r4k_* and updates the wrappers in asm-mips/time.h to call these renamed functions instead. Chips which can detect whether it is safe to use a chip-specific timer can now fall back on the cp0 counter if necessary and possible (e.g. Alchemy with a follow-on patch). Existing behaviour is not changed in any way. Signed-off-by: Manuel Lauss Signed-off-by: Ralf Baechle --- arch/mips/Kconfig | 8 ++++++++ arch/mips/include/asm/time.h | 24 ++++++++++++++++-------- arch/mips/kernel/Makefile | 4 ++-- arch/mips/kernel/cevt-r4k.c | 2 +- arch/mips/kernel/csrc-r4k.c | 2 +- 5 files changed, 28 insertions(+), 12 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 424ff744d07..52c80c2a57f 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -721,7 +721,11 @@ config CEVT_DS1287 config CEVT_GT641XX bool +config CEVT_R4K_LIB + bool + config CEVT_R4K + select CEVT_R4K_LIB bool config CEVT_SB1250 @@ -736,7 +740,11 @@ config CSRC_BCM1480 config CSRC_IOASIC bool +config CSRC_R4K_LIB + bool + config CSRC_R4K + select CSRC_R4K_LIB bool config CSRC_SB1250 diff --git a/arch/mips/include/asm/time.h b/arch/mips/include/asm/time.h index 9601ea95054..38a30d2ee95 100644 --- a/arch/mips/include/asm/time.h +++ b/arch/mips/include/asm/time.h @@ -50,27 +50,35 @@ extern int (*perf_irq)(void); /* * Initialize the calling CPU's compare interrupt as clockevent device */ -#ifdef CONFIG_CEVT_R4K -extern int mips_clockevent_init(void); +#ifdef CONFIG_CEVT_R4K_LIB extern unsigned int __weak get_c0_compare_int(void); -#else +extern int r4k_clockevent_init(void); +#endif + static inline int mips_clockevent_init(void) { +#ifdef CONFIG_CEVT_R4K + return r4k_clockevent_init(); +#else return -ENXIO; -} #endif +} /* * Initialize the count register as a clocksource */ -#ifdef CONFIG_CSRC_R4K -extern int init_mips_clocksource(void); -#else +#ifdef CONFIG_CSRC_R4K_LIB +extern int init_r4k_clocksource(void); +#endif + static inline int init_mips_clocksource(void) { +#ifdef CONFIG_CSRC_R4K + return init_r4k_clocksource(); +#else return 0; -} #endif +} extern void clocksource_set_clock(struct clocksource *cs, unsigned int clock); extern void clockevent_set_clock(struct clock_event_device *cd, diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index 3ab4ac971fc..e9612215992 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -9,7 +9,7 @@ obj-y += cpu-probe.o branch.o entry.o genex.o irq.o process.o \ time.o topology.o traps.o unaligned.o watch.o obj-$(CONFIG_CEVT_BCM1480) += cevt-bcm1480.o -obj-$(CONFIG_CEVT_R4K) += cevt-r4k.o +obj-$(CONFIG_CEVT_R4K_LIB) += cevt-r4k.o obj-$(CONFIG_MIPS_MT_SMTC) += cevt-smtc.o obj-$(CONFIG_CEVT_DS1287) += cevt-ds1287.o obj-$(CONFIG_CEVT_GT641XX) += cevt-gt641xx.o @@ -17,7 +17,7 @@ obj-$(CONFIG_CEVT_SB1250) += cevt-sb1250.o obj-$(CONFIG_CEVT_TXX9) += cevt-txx9.o obj-$(CONFIG_CSRC_BCM1480) += csrc-bcm1480.o obj-$(CONFIG_CSRC_IOASIC) += csrc-ioasic.o -obj-$(CONFIG_CSRC_R4K) += csrc-r4k.o +obj-$(CONFIG_CSRC_R4K_LIB) += csrc-r4k.o obj-$(CONFIG_CSRC_SB1250) += csrc-sb1250.o obj-$(CONFIG_SYNC_R4K) += sync-r4k.o diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c index e1ec83b6803..0015e442572 100644 --- a/arch/mips/kernel/cevt-r4k.c +++ b/arch/mips/kernel/cevt-r4k.c @@ -160,7 +160,7 @@ int c0_compare_int_usable(void) #ifndef CONFIG_MIPS_MT_SMTC -int __cpuinit mips_clockevent_init(void) +int __cpuinit r4k_clockevent_init(void) { uint64_t mips_freq = mips_hpt_frequency; unsigned int cpu = smp_processor_id(); diff --git a/arch/mips/kernel/csrc-r4k.c b/arch/mips/kernel/csrc-r4k.c index 74fb74583b4..f1a2893931e 100644 --- a/arch/mips/kernel/csrc-r4k.c +++ b/arch/mips/kernel/csrc-r4k.c @@ -22,7 +22,7 @@ static struct clocksource clocksource_mips = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; -int __init init_mips_clocksource(void) +int __init init_r4k_clocksource(void) { if (!cpu_has_counter || !mips_hpt_frequency) return -ENXIO; -- 2.20.1