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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /arch/s390/lib/delay.c
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'arch/s390/lib/delay.c')
-rw-r--r--arch/s390/lib/delay.c30
1 files changed, 14 insertions, 16 deletions
diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index 246a7eb4b..501dcd4ca 100644
--- a/arch/s390/lib/delay.c
+++ b/arch/s390/lib/delay.c
@@ -12,8 +12,10 @@
#include <linux/module.h>
#include <linux/irqflags.h>
#include <linux/interrupt.h>
+#include <linux/irq.h>
#include <asm/vtimer.h>
#include <asm/div64.h>
+#include <asm/idle.h>
void __delay(unsigned long loops)
{
@@ -30,26 +32,22 @@ EXPORT_SYMBOL(__delay);
static void __udelay_disabled(unsigned long long usecs)
{
- unsigned long cr0, cr6, new;
- u64 clock_saved, end;
+ unsigned long cr0, cr0_new, psw_mask;
+ struct s390_idle_data idle;
+ u64 end;
end = get_tod_clock() + (usecs << 12);
- clock_saved = local_tick_disable();
__ctl_store(cr0, 0, 0);
- __ctl_store(cr6, 6, 6);
- new = (cr0 & 0xffff00e0) | 0x00000800;
- __ctl_load(new , 0, 0);
- new = 0;
- __ctl_load(new, 6, 6);
- lockdep_off();
- do {
- set_clock_comparator(end);
- enabled_wait();
- } while (get_tod_clock_fast() < end);
- lockdep_on();
+ cr0_new = cr0 & ~CR0_IRQ_SUBCLASS_MASK;
+ cr0_new |= (1UL << (63 - 52)); /* enable clock comparator irq */
+ __ctl_load(cr0_new, 0, 0);
+ psw_mask = __extract_psw() | PSW_MASK_EXT | PSW_MASK_WAIT;
+ set_clock_comparator(end);
+ set_cpu_flag(CIF_IGNORE_IRQ);
+ psw_idle(&idle, psw_mask);
+ clear_cpu_flag(CIF_IGNORE_IRQ);
+ set_clock_comparator(S390_lowcore.clock_comparator);
__ctl_load(cr0, 0, 0);
- __ctl_load(cr6, 6, 6);
- local_tick_enable(clock_saved);
}
static void __udelay_enabled(unsigned long long usecs)