sparc32: generic clockevent support

The kernel uses l14 timers as clockevents. l10 timer is used
as clocksource if platform master_l10_counter isn't constantly
zero. The clocksource is continuous, so it's possible to use
high resolution timers. l10 timer is also used as clockevent
on UP configurations.

This realization is for sun4m, sun4d, sun4c, microsparc-IIep
and LEON platforms. The appropriate LEON changes was made by
Konrad Eisele.

In case of sun4m's oneshot mode, profile irq is zeroed in
smp4m_percpu_timer_interrupt(). It is maybe
needless (double, triple etc overflow does nothing).

sun4d is able to have oneshot mode too, but I haven't
any way to test it. So code of its percpu timer handler
is made as much equal to the current code as possible.

The patch is tested on sun4m box in SMP mode by me,
and tested by Konrad on leon in up mode (leon smp
is broken atm - due to other reasons).

Signed-off-by: Tkhai Kirill <tkhai@yandex.ru>
Tested-by: Konrad Eisele <konrad@gaisler.com> [leon up]
[sam: revised patch to provide generic support for leon]
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 30 deletions

diff --git a/arch/sparc/kernel/leon_smp.c b/arch/sparc/kernel/leon_smp.c
index 1210fde18740..6173f4d82ded 100644
--- a/arch/sparc/kernel/leon_smp.c
+++ b/arch/sparc/kernel/leon_smp.c
@@ -23,6 +23,8 @@
 #include <linux/pm.h>
 #include <linux/delay.h>
 #include <linux/gfp.h>
+#include <linux/cpu.h>
+#include <linux/clockchips.h>
 
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
@@ -42,6 +44,7 @@
 #include <asm/asi.h>
 #include <asm/leon.h>
 #include <asm/leon_amba.h>
+#include <asm/timer.h>
 
 #include "kernel.h"
 
@@ -68,8 +71,6 @@ static inline unsigned long do_swap(volatile unsigned long *ptr,
         return val;
 }
 
-static void smp_setup_percpu_timer(void);
-
 void __cpuinit leon_callin(void)
 {
         int cpuid = hard_smpleon_processor_id();
@@ -79,7 +80,7 @@ void __cpuinit leon_callin(void)
         leon_configure_cache_smp();
 
         /* Get our local ticker going. */
-        smp_setup_percpu_timer();
+        register_percpu_ce(cpuid);
 
         calibrate_delay();
         smp_store_cpu_info(cpuid);
@@ -196,7 +197,6 @@ void __init leon_boot_cpus(void)
         leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
 
         leon_configure_cache_smp();
-        smp_setup_percpu_timer();
         local_flush_cache_all();
 
 }
@@ -489,32 +489,6 @@ void leon_cross_call_irq(void)
         ccall_info.processors_out[i] = 1;
 }
 
-irqreturn_t leon_percpu_timer_interrupt(int irq, void *unused)
-{
-        int cpu = smp_processor_id();
-
-        leon_clear_profile_irq(cpu);
-
-        profile_tick(CPU_PROFILING);
-
-        if (!--prof_counter(cpu)) {
-                int user = user_mode(get_irq_regs());
-
-                update_process_times(user);
-
-                prof_counter(cpu) = prof_multiplier(cpu);
-        }
-
-        return IRQ_HANDLED;
-}
-
-static void __init smp_setup_percpu_timer(void)
-{
-        int cpu = smp_processor_id();
-
-        prof_counter(cpu) = prof_multiplier(cpu) = 1;
-}
-
 void __init leon_blackbox_id(unsigned *addr)
 {
         int rd = *addr & 0x3e000000;