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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2011-08-23 09:29:43 -0400
committerThomas Gleixner <tglx@linutronix.de>2011-09-08 05:10:56 -0400
commit65516f8a7c2028381f0dae4c16ddb621c96158cc (patch)
tree1f6192832c77e25499331b074398e165c1220197 /include
parentd1748302f70be7469809809283fe164156a34231 (diff)
clockevents: Add direct ktime programming function
There is at least one architecture (s390) with a sane clockevent device that can be programmed with the equivalent of a ktime. No need to create a delta against the current time, the ktime can be used directly. A new clock device function 'set_next_ktime' is introduced that is called with the unmodified ktime for the timer if the clock event device has the CLOCK_EVT_FEAT_KTIME bit set. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: john stultz <johnstul@us.ibm.com> Link: http://lkml.kernel.org/r/20110823133142.815350967@de.ibm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/clockchips.h10
1 files changed, 7 insertions, 3 deletions
diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h
index 39bb050bdbb2..81e803e90aa4 100644
--- a/include/linux/clockchips.h
+++ b/include/linux/clockchips.h
@@ -45,20 +45,22 @@ enum clock_event_nofitiers {
45 */ 45 */
46#define CLOCK_EVT_FEAT_PERIODIC 0x000001 46#define CLOCK_EVT_FEAT_PERIODIC 0x000001
47#define CLOCK_EVT_FEAT_ONESHOT 0x000002 47#define CLOCK_EVT_FEAT_ONESHOT 0x000002
48#define CLOCK_EVT_FEAT_KTIME 0x000004
48/* 49/*
49 * x86(64) specific misfeatures: 50 * x86(64) specific misfeatures:
50 * 51 *
51 * - Clockevent source stops in C3 State and needs broadcast support. 52 * - Clockevent source stops in C3 State and needs broadcast support.
52 * - Local APIC timer is used as a dummy device. 53 * - Local APIC timer is used as a dummy device.
53 */ 54 */
54#define CLOCK_EVT_FEAT_C3STOP 0x000004 55#define CLOCK_EVT_FEAT_C3STOP 0x000008
55#define CLOCK_EVT_FEAT_DUMMY 0x000008 56#define CLOCK_EVT_FEAT_DUMMY 0x000010
56 57
57/** 58/**
58 * struct clock_event_device - clock event device descriptor 59 * struct clock_event_device - clock event device descriptor
59 * @event_handler: Assigned by the framework to be called by the low 60 * @event_handler: Assigned by the framework to be called by the low
60 * level handler of the event source 61 * level handler of the event source
61 * @set_next_event: set next event function 62 * @set_next_event: set next event function using a clocksource delta
63 * @set_next_ktime: set next event function using a direct ktime value
62 * @next_event: local storage for the next event in oneshot mode 64 * @next_event: local storage for the next event in oneshot mode
63 * @max_delta_ns: maximum delta value in ns 65 * @max_delta_ns: maximum delta value in ns
64 * @min_delta_ns: minimum delta value in ns 66 * @min_delta_ns: minimum delta value in ns
@@ -81,6 +83,8 @@ struct clock_event_device {
81 void (*event_handler)(struct clock_event_device *); 83 void (*event_handler)(struct clock_event_device *);
82 int (*set_next_event)(unsigned long evt, 84 int (*set_next_event)(unsigned long evt,
83 struct clock_event_device *); 85 struct clock_event_device *);
86 int (*set_next_ktime)(ktime_t expires,
87 struct clock_event_device *);
84 ktime_t next_event; 88 ktime_t next_event;
85 u64 max_delta_ns; 89 u64 max_delta_ns;
86 u64 min_delta_ns; 90 u64 min_delta_ns;