[ARM] smp: allow re-use of realview localtimer TWD support

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

5 files changed, 8 insertions, 144 deletions

diff --git a/arch/arm/mach-realview/Makefile b/arch/arm/mach-realview/Makefile
index 7bea8ffc4b59..e13d0947ad0b 100644
--- a/arch/arm/mach-realview/Makefile
+++ b/arch/arm/mach-realview/Makefile
@@ -7,5 +7,6 @@ obj-$(CONFIG_MACH_REALVIEW_EB)		+= realview_eb.o
 obj-$(CONFIG_MACH_REALVIEW_PB11MP)      += realview_pb11mp.o
 obj-$(CONFIG_MACH_REALVIEW_PB1176)      += realview_pb1176.o
 obj-$(CONFIG_MACH_REALVIEW_PBA8)        += realview_pba8.o
-obj-$(CONFIG_SMP)                       += platsmp.o headsmp.o localtimer.o
+obj-$(CONFIG_SMP)                       += platsmp.o headsmp.o
 obj-$(CONFIG_HOTPLUG_CPU)               += hotplug.o
+obj-$(CONFIG_LOCAL_TIMERS)              += localtimer.o
diff --git a/arch/arm/mach-realview/core.h b/arch/arm/mach-realview/core.h
index 21c08637683b..59a337ba4be7 100644
--- a/arch/arm/mach-realview/core.h
+++ b/arch/arm/mach-realview/core.h
@@ -51,9 +51,6 @@ extern struct mmc_platform_data realview_mmc0_plat_data;
 extern struct mmc_platform_data realview_mmc1_plat_data;
 extern struct clcd_board clcd_plat_data;
 extern void __iomem *gic_cpu_base_addr;
-#ifdef CONFIG_LOCAL_TIMERS
-extern void __iomem *twd_base;
-#endif
 extern void __iomem *timer0_va_base;
 extern void __iomem *timer1_va_base;
 extern void __iomem *timer2_va_base;
diff --git a/arch/arm/mach-realview/localtimer.c b/arch/arm/mach-realview/localtimer.c
index cd98e7acd94d..60b4e111f459 100644
--- a/arch/arm/mach-realview/localtimer.c
+++ b/arch/arm/mach-realview/localtimer.c
@@ -9,154 +9,18 @@
  * published by the Free Software Foundation.
  */
 #include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
 #include <linux/smp.h>
-#include <linux/jiffies.h>
 #include <linux/clockchips.h>
-#include <linux/irq.h>
-#include <linux/io.h>
 
-#include <asm/hardware/arm_twd.h>
-#include <asm/hardware/gic.h>
-#include <mach/hardware.h>
 #include <asm/irq.h>
-
-#ifdef CONFIG_LOCAL_TIMERS
-
-/* set up by the platform code */
-void __iomem *twd_base;
-
-static unsigned long mpcore_timer_rate;
-
-static void local_timer_set_mode(enum clock_event_mode mode,
-                                 struct clock_event_device *evt)
-{
-        unsigned long ctrl;
-
-        switch(mode) {
-        case CLOCK_EVT_MODE_PERIODIC:
-                /* timer load already set up */
-                ctrl = TWD_TIMER_CONTROL_ENABLE | TWD_TIMER_CONTROL_IT_ENABLE
-                        | TWD_TIMER_CONTROL_PERIODIC;
-                break;
-        case CLOCK_EVT_MODE_ONESHOT:
-                /* period set, and timer enabled in 'next_event' hook */
-                ctrl = TWD_TIMER_CONTROL_IT_ENABLE | TWD_TIMER_CONTROL_ONESHOT;
-                break;
-        case CLOCK_EVT_MODE_UNUSED:
-        case CLOCK_EVT_MODE_SHUTDOWN:
-        default:
-                ctrl = 0;
-        }
-
-        __raw_writel(ctrl, twd_base + TWD_TIMER_CONTROL);
-}
-
-static int local_timer_set_next_event(unsigned long evt,
-                                      struct clock_event_device *unused)
-{
-        unsigned long ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL);
-
-        __raw_writel(evt, twd_base + TWD_TIMER_COUNTER);
-        __raw_writel(ctrl | TWD_TIMER_CONTROL_ENABLE, twd_base + TWD_TIMER_CONTROL);
-
-        return 0;
-}
-
-/*
- * local_timer_ack: checks for a local timer interrupt.
- *
- * If a local timer interrupt has occurred, acknowledge and return 1.
- * Otherwise, return 0.
- */
-int local_timer_ack(void)
-{
-        if (__raw_readl(twd_base + TWD_TIMER_INTSTAT)) {
-                __raw_writel(1, twd_base + TWD_TIMER_INTSTAT);
-                return 1;
-        }
-
-        return 0;
-}
-
-static void __cpuinit twd_calibrate_rate(void)
-{
-        unsigned long load, count;
-        u64 waitjiffies;
-
-        /*
-         * If this is the first time round, we need to work out how fast
-         * the timer ticks
-         */
-        if (mpcore_timer_rate == 0) {
-                printk("Calibrating local timer... ");
-
-                /* Wait for a tick to start */
-                waitjiffies = get_jiffies_64() + 1;
-
-                while (get_jiffies_64() < waitjiffies)
-                        udelay(10);
-
-                /* OK, now the tick has started, let's get the timer going */
-                waitjiffies += 5;
-
-                                 /* enable, no interrupt or reload */
-                __raw_writel(0x1, twd_base + TWD_TIMER_CONTROL);
-
-                                 /* maximum value */
-                __raw_writel(0xFFFFFFFFU, twd_base + TWD_TIMER_COUNTER);
-
-                while (get_jiffies_64() < waitjiffies)
-                        udelay(10);
-
-                count = __raw_readl(twd_base + TWD_TIMER_COUNTER);
-
-                mpcore_timer_rate = (0xFFFFFFFFU - count) * (HZ / 5);
-
-                printk("%lu.%02luMHz.\n", mpcore_timer_rate / 1000000,
-                        (mpcore_timer_rate / 100000) % 100);
-        }
-
-        load = mpcore_timer_rate / HZ;
-
-        __raw_writel(load, twd_base + TWD_TIMER_LOAD);
-}
+#include <asm/smp_twd.h>
+#include <asm/localtimer.h>
 
 /*
  * Setup the local clock events for a CPU.
  */
 void __cpuinit local_timer_setup(struct clock_event_device *evt)
 {
-        unsigned long flags;
-
-        twd_calibrate_rate();
-
-        evt->name               = "local_timer";
-        evt->features           = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
-        evt->rating             = 350;
-        evt->set_mode           = local_timer_set_mode;
-        evt->set_next_event     = local_timer_set_next_event;
-        evt->irq                = IRQ_LOCALTIMER;
-        evt->shift              = 20;
-        evt->mult               = div_sc(mpcore_timer_rate, NSEC_PER_SEC, evt->shift);
-        evt->max_delta_ns       = clockevent_delta2ns(0xffffffff, evt);
-        evt->min_delta_ns       = clockevent_delta2ns(0xf, evt);
-
-        /* Make sure our local interrupt controller has this enabled */
-        local_irq_save(flags);
-        get_irq_chip(IRQ_LOCALTIMER)->unmask(IRQ_LOCALTIMER);
-        local_irq_restore(flags);
-
-        clockevents_register_device(evt);
+        evt->irq = IRQ_LOCALTIMER;
+        twd_timer_setup(evt);
 }
-
-/*
- * take a local timer down
- */
-void __cpuexit local_timer_stop(void)
-{
-        __raw_writel(0, twd_base + TWD_TIMER_CONTROL);
-}
-
-#endif  /* CONFIG_LOCAL_TIMERS */
diff --git a/arch/arm/mach-realview/realview_eb.c b/arch/arm/mach-realview/realview_eb.c
index c20fbef122b3..8dfa44e08a94 100644
--- a/arch/arm/mach-realview/realview_eb.c
+++ b/arch/arm/mach-realview/realview_eb.c
@@ -32,6 +32,7 @@
 #include <asm/hardware/gic.h>
 #include <asm/hardware/icst307.h>
 #include <asm/hardware/cache-l2x0.h>
+#include <asm/localtimer.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
diff --git a/arch/arm/mach-realview/realview_pb11mp.c b/arch/arm/mach-realview/realview_pb11mp.c
index ea1e60eca359..dc4b16943907 100644
--- a/arch/arm/mach-realview/realview_pb11mp.c
+++ b/arch/arm/mach-realview/realview_pb11mp.c
@@ -32,6 +32,7 @@
 #include <asm/hardware/gic.h>
 #include <asm/hardware/icst307.h>
 #include <asm/hardware/cache-l2x0.h>
+#include <asm/localtimer.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/flash.h>