diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/clocksource/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/clocksource/Makefile | 2 | ||||
| -rw-r--r-- | drivers/clocksource/i8253.c | 13 |
3 files changed, 19 insertions, 2 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 96c921910469..330343bcb67e 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -1,5 +1,11 @@ config CLKSRC_I8253 bool +config I8253_LOCK + bool + +config CLKBLD_I8253 + def_bool y if CLKSRC_I8253 || I8253_LOCK + config CLKSRC_MMIO bool diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index b995942a5060..7922a0cfc99f 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -6,5 +6,5 @@ obj-$(CONFIG_CS5535_CLOCK_EVENT_SRC) += cs5535-clockevt.o obj-$(CONFIG_SH_TIMER_CMT) += sh_cmt.o obj-$(CONFIG_SH_TIMER_MTU2) += sh_mtu2.o obj-$(CONFIG_SH_TIMER_TMU) += sh_tmu.o -obj-$(CONFIG_CLKSRC_I8253) += i8253.o +obj-$(CONFIG_CLKBLD_I8253) += i8253.o obj-$(CONFIG_CLKSRC_MMIO) += mmio.o diff --git a/drivers/clocksource/i8253.c b/drivers/clocksource/i8253.c index 33735ebd2dcc..e594f52eb88e 100644 --- a/drivers/clocksource/i8253.c +++ b/drivers/clocksource/i8253.c @@ -6,10 +6,20 @@ #include <linux/io.h> #include <linux/spinlock.h> #include <linux/timex.h> - +#include <linux/module.h> #include <linux/i8253.h> /* + * Protects access to I/O ports + * + * 0040-0043 : timer0, i8253 / i8254 + * 0061-0061 : NMI Control Register which contains two speaker control bits. + */ +DEFINE_RAW_SPINLOCK(i8253_lock); +EXPORT_SYMBOL(i8253_lock); + +#ifdef CONFIG_CLKSRC_I8253 +/* * Since the PIT overflows every tick, its not very useful * to just read by itself. So use jiffies to emulate a free * running counter: @@ -86,3 +96,4 @@ int __init clocksource_i8253_init(void) { return clocksource_register_hz(&i8253_cs, PIT_TICK_RATE); } +#endif |