Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
  [MIPS] time: Move R4000 clockevent device code to separate configurable file
  [MIPS] time: Delete dead cycles_per_jiffy, mips_timer_ack and null_timer_ack
  [MIPS] IP32: Retire use of plat_timer_setup.
  [MIPS] Jazz: Retire use of plat_timer_setup.
  [MIPS] IP27: Convert to clock_event_device.
  [MIPS] JMR3927: Convert to clock_event_device.
  [MIPS] Always do the ARC64_TWIDDLE_PC thing.

17 files changed, 483 insertions, 375 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 235d451..cb02758 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -21,6 +21,7 @@ config MACH_ALCHEMY
 
 config BASLER_EXCITE
 	bool "Basler eXcite smart camera"
+	select CEVT_R4K
 	select DMA_COHERENT
 	select HW_HAS_PCI
 	select IRQ_CPU
@@ -47,6 +48,7 @@ config BASLER_EXCITE_PROTOTYPE
 
 config BCM47XX
 	bool "BCM47XX based boards"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select HW_HAS_PCI
 	select IRQ_CPU
@@ -63,6 +65,7 @@ config BCM47XX
 
 config MIPS_COBALT
 	bool "Cobalt Server"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select HW_HAS_PCI
 	select I8253
@@ -80,6 +83,7 @@ config MIPS_COBALT
 config MACH_DECSTATION
 	bool "DECstations"
 	select BOOT_ELF32
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select NO_IOPORT
 	select IRQ_CPU
@@ -111,6 +115,7 @@ config MACH_JAZZ
 	select ARC
 	select ARC32
 	select ARCH_MAY_HAVE_PC_FDC
+	select CEVT_R4K
 	select GENERIC_ISA_DMA
 	select IRQ_CPU
 	select I8253
@@ -130,6 +135,7 @@ config MACH_JAZZ
 
 config LASAT
 	bool "LASAT Networks platforms"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select SYS_HAS_EARLY_PRINTK
 	select HW_HAS_PCI
@@ -146,6 +152,7 @@ config LASAT
 config LEMOTE_FULONG
 	bool "Lemote Fulong mini-PC"
 	select ARCH_SPARSEMEM_ENABLE
+	select CEVT_R4K
 	select SYS_HAS_CPU_LOONGSON2
 	select DMA_NONCOHERENT
 	select BOOT_ELF32
@@ -170,6 +177,7 @@ config LEMOTE_FULONG
 config MIPS_ATLAS
 	bool "MIPS Atlas board"
 	select BOOT_ELF32
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select SYS_HAS_EARLY_PRINTK
 	select IRQ_CPU
@@ -200,6 +208,7 @@ config MIPS_MALTA
 	bool "MIPS Malta board"
 	select ARCH_MAY_HAVE_PC_FDC
 	select BOOT_ELF32
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select GENERIC_ISA_DMA
 	select IRQ_CPU
@@ -230,6 +239,7 @@ config MIPS_MALTA
 
 config MIPS_SEAD
 	bool "MIPS SEAD board"
+	select CEVT_R4K
 	select IRQ_CPU
 	select DMA_NONCOHERENT
 	select SYS_HAS_EARLY_PRINTK
@@ -248,6 +258,7 @@ config MIPS_SEAD
 
 config MIPS_SIM
 	bool 'MIPS simulator (MIPSsim)'
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select SYS_HAS_EARLY_PRINTK
 	select IRQ_CPU
@@ -265,6 +276,7 @@ config MIPS_SIM
 
 config MARKEINS
 	bool "NEC EMMA2RH Mark-eins"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select HW_HAS_PCI
 	select IRQ_CPU
@@ -279,6 +291,7 @@ config MARKEINS
 
 config MACH_VR41XX
 	bool "NEC VR4100 series based machines"
+	select CEVT_R4K
 	select SYS_HAS_CPU_VR41XX
 	select GENERIC_HARDIRQS_NO__DO_IRQ
 
@@ -315,6 +328,7 @@ config PMC_MSP
 
 config PMC_YOSEMITE
 	bool "PMC-Sierra Yosemite eval board"
+	select CEVT_R4K
 	select DMA_COHERENT
 	select HW_HAS_PCI
 	select IRQ_CPU
@@ -335,6 +349,7 @@ config PMC_YOSEMITE
 
 config QEMU
 	bool "Qemu"
+	select CEVT_R4K
 	select DMA_COHERENT
 	select GENERIC_ISA_DMA
 	select HAVE_STD_PC_SERIAL_PORT
@@ -365,6 +380,7 @@ config SGI_IP22
 	select ARC
 	select ARC32
 	select BOOT_ELF32
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select HW_HAS_EISA
 	select I8253
@@ -409,6 +425,7 @@ config SGI_IP32
 	select ARC
 	select ARC32
 	select BOOT_ELF32
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select HW_HAS_PCI
 	select IRQ_CPU
@@ -536,6 +553,7 @@ config SNI_RM
 	select ARC32 if CPU_LITTLE_ENDIAN
 	select ARCH_MAY_HAVE_PC_FDC
 	select BOOT_ELF32
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select GENERIC_ISA_DMA
 	select HW_HAS_EISA
@@ -577,6 +595,7 @@ config TOSHIBA_JMR3927
 
 config TOSHIBA_RBTX4927
 	bool "Toshiba RBTX49[23]7 board"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select HAS_TXX9_SERIAL
 	select HW_HAS_PCI
@@ -597,6 +616,7 @@ config TOSHIBA_RBTX4927
 
 config TOSHIBA_RBTX4938
 	bool "Toshiba RBTX4938 board"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select HAS_TXX9_SERIAL
 	select HW_HAS_PCI
@@ -616,6 +636,7 @@ config TOSHIBA_RBTX4938
 
 config WR_PPMC
 	bool "Wind River PPMC board"
+	select CEVT_R4K
 	select IRQ_CPU
 	select BOOT_ELF32
 	select DMA_NONCOHERENT
@@ -708,6 +729,9 @@ config ARCH_MAY_HAVE_PC_FDC
 config BOOT_RAW
 	bool
 
+config CEVT_R4K
+	bool
+
 config CFE
 	bool
 
diff --git a/arch/mips/au1000/Kconfig b/arch/mips/au1000/Kconfig
index a23d415..b36cec58 100644
--- a/arch/mips/au1000/Kconfig
+++ b/arch/mips/au1000/Kconfig
@@ -137,6 +137,7 @@ config SOC_AU1200
 config SOC_AU1X00
 	bool
 	select 64BIT_PHYS_ADDR
+	select CEVT_R4K
 	select IRQ_CPU
 	select SYS_HAS_CPU_MIPS32_R1
 	select SYS_SUPPORTS_32BIT_KERNEL
diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c
index 835b056..ae25b48 100644
--- a/arch/mips/jazz/irq.c
+++ b/arch/mips/jazz/irq.c
@@ -4,7 +4,7 @@
  * for more details.
  *
  * Copyright (C) 1992 Linus Torvalds
- * Copyright (C) 1994 - 2001, 2003 Ralf Baechle
+ * Copyright (C) 1994 - 2001, 2003, 07 Ralf Baechle
  */
 #include <linux/clockchips.h>
 #include <linux/init.h>
@@ -13,6 +13,7 @@
 #include <linux/spinlock.h>
 
 #include <asm/irq_cpu.h>
+#include <asm/i8253.h>
 #include <asm/i8259.h>
 #include <asm/io.h>
 #include <asm/jazz.h>
@@ -136,7 +137,7 @@ static struct irqaction r4030_timer_irqaction = {
 	.name		= "timer",
 };
 
-void __init plat_timer_setup(struct irqaction *ignored)
+void __init plat_time_init(void)
 {
 	struct irqaction *irq = &r4030_timer_irqaction;
 
@@ -152,4 +153,5 @@ void __init plat_timer_setup(struct irqaction *ignored)
 	setup_irq(JAZZ_TIMER_IRQ, irq);
 
 	clockevents_register_device(&r4030_clockevent);
+	setup_pit_timer();
 }
diff --git a/arch/mips/jazz/setup.c b/arch/mips/jazz/setup.c
index cfc7dce..a785797 100644
--- a/arch/mips/jazz/setup.c
+++ b/arch/mips/jazz/setup.c
@@ -5,7 +5,7 @@
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  *
- * Copyright (C) 1996, 1997, 1998, 2001 by Ralf Baechle
+ * Copyright (C) 1996, 1997, 1998, 2001, 07 by Ralf Baechle
  * Copyright (C) 2001 MIPS Technologies, Inc.
  * Copyright (C) 2007 by Thomas Bogendoerfer
  */
@@ -25,7 +25,6 @@
 #include <linux/serial_8250.h>
 
 #include <asm/bootinfo.h>
-#include <asm/i8253.h>
 #include <asm/irq.h>
 #include <asm/jazz.h>
 #include <asm/jazzdma.h>
@@ -64,11 +63,6 @@ static struct resource jazz_io_resources[] = {
 	}
 };
 
-void __init plat_time_init(void)
-{
-	setup_pit_timer();
-}
-
 void __init plat_mem_setup(void)
 {
 	int i;
diff --git a/arch/mips/jmr3927/rbhma3100/setup.c b/arch/mips/jmr3927/rbhma3100/setup.c
index 0c7aee1..edb9e59 100644
--- a/arch/mips/jmr3927/rbhma3100/setup.c
+++ b/arch/mips/jmr3927/rbhma3100/setup.c
@@ -1,15 +1,4 @@
-/***********************************************************************
- *
- * Copyright 2001 MontaVista Software Inc.
- * Author: MontaVista Software, Inc.
- *              ahennessy@mvista.com
- *
- * Based on arch/mips/ddb5xxx/ddb5477/setup.c
- *
- *     Setup file for JMR3927.
- *
- * Copyright (C) 2000-2001 Toshiba Corporation
- *
+/*
  *  This program is free software; you can redistribute  it and/or modify it
  *  under  the terms of  the GNU General  Public License as published by the
  *  Free Software Foundation;  either version 2 of the  License, or (at your
@@ -30,9 +19,15 @@
  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  *  675 Mass Ave, Cambridge, MA 02139, USA.
  *
- ***********************************************************************
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ *              ahennessy@mvista.com
+ *
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ * Copyright (C) 2007 Ralf Baechle (ralf@linux-mips.org)
  */
 
+#include <linux/clockchips.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/kdev_t.h>
@@ -104,27 +99,60 @@ static cycle_t jmr3927_hpt_read(void)
 	return jiffies * (JMR3927_TIMER_CLK / HZ) + jmr3927_tmrptr->trr;
 }
 
-static void jmr3927_timer_ack(void)
+static void jmr3927_set_mode(enum clock_event_mode mode,
+	struct clock_event_device *evt)
+{
+	/* Nothing to do here */
+}
+
+struct clock_event_device jmr3927_clock_event_device = {
+	.name		= "MIPS",
+	.features	= CLOCK_EVT_FEAT_PERIODIC,
+	.shift		= 32,
+	.rating		= 300,
+	.cpumask	= CPU_MASK_CPU0,
+	.irq		= JMR3927_IRQ_TICK,
+	.set_mode	= jmr3927_set_mode,
+};
+
+static irqreturn_t jmr3927_timer_interrupt(int irq, void *dev_id)
 {
+	struct clock_event_device *cd = &jmr3927_clock_event_device;
+
 	jmr3927_tmrptr->tisr = 0;       /* ack interrupt */
+
+	cd->event_handler(cd);
+
+	return IRQ_HANDLED;
 }
 
+static struct irqaction jmr3927_timer_irqaction = {
+	.handler	= jmr3927_timer_interrupt,
+	.flags		= IRQF_DISABLED | IRQF_PERCPU,
+	.name		= "jmr3927-timer",
+};
+
 void __init plat_time_init(void)
 {
+	struct clock_event_device *cd;
+
 	clocksource_mips.read = jmr3927_hpt_read;
-	mips_timer_ack = jmr3927_timer_ack;
 	mips_hpt_frequency = JMR3927_TIMER_CLK;
-}
 
-void __init plat_timer_setup(struct irqaction *irq)
-{
 	jmr3927_tmrptr->cpra = JMR3927_TIMER_CLK / HZ;
 	jmr3927_tmrptr->itmr = TXx927_TMTITMR_TIIE | TXx927_TMTITMR_TZCE;
 	jmr3927_tmrptr->ccdr = JMR3927_TIMER_CCD;
 	jmr3927_tmrptr->tcr =
 		TXx927_TMTCR_TCE | TXx927_TMTCR_CCDE | TXx927_TMTCR_TMODE_ITVL;
 
-	setup_irq(JMR3927_IRQ_TICK, irq);
+	cd = &jmr3927_clock_event_device;
+	/* Calculate the min / max delta */
+	cd->mult = div_sc((unsigned long) JMR3927_IMCLK, NSEC_PER_SEC, 32);
+	cd->max_delta_ns	= clockevent_delta2ns(0x7fffffff, cd);
+	cd->min_delta_ns	= clockevent_delta2ns(0x300, cd);
+	clockevents_register_device(cd);
+
+	setup_irq(JMR3927_IRQ_TICK, &jmr3927_timer_irqaction);
 }
 
 #define DO_WRITE_THROUGH
diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile
index 95a356e..a3afa39 100644
--- a/arch/mips/kernel/Makefile
+++ b/arch/mips/kernel/Makefile
@@ -8,6 +8,8 @@ obj-y		+= cpu-probe.o branch.o entry.o genex.o irq.o process.o \
 		   ptrace.o reset.o semaphore.o setup.o signal.o syscall.o \
 		   time.o topology.o traps.o unaligned.o
 
+obj-$(CONFIG_CEVT_R4K)		+= cevt-r4k.o
+
 binfmt_irix-objs	:= irixelf.o irixinv.o irixioctl.o irixsig.o	\
 			   irix5sys.o sysirix.o
 
diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c
new file mode 100644
index 0000000..08b84d4
--- /dev/null
+++ b/arch/mips/kernel/cevt-r4k.c
@@ -0,0 +1,272 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2007 MIPS Technologies, Inc.
+ * Copyright (C) 2007 Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+#include <linux/percpu.h>
+
+#include <asm/time.h>
+
+static int mips_next_event(unsigned long delta,
+                           struct clock_event_device *evt)
+{
+	unsigned int cnt;
+	int res;
+
+#ifdef CONFIG_MIPS_MT_SMTC
+	{
+	unsigned long flags, vpflags;
+	local_irq_save(flags);
+	vpflags = dvpe();
+#endif
+	cnt = read_c0_count();
+	cnt += delta;
+	write_c0_compare(cnt);
+	res = ((long)(read_c0_count() - cnt ) > 0) ? -ETIME : 0;
+#ifdef CONFIG_MIPS_MT_SMTC
+	evpe(vpflags);
+	local_irq_restore(flags);
+	}
+#endif
+	return res;
+}
+
+static void mips_set_mode(enum clock_event_mode mode,
+                          struct clock_event_device *evt)
+{
+	/* Nothing to do ...  */
+}
+
+static DEFINE_PER_CPU(struct clock_event_device, mips_clockevent_device);
+static int cp0_timer_irq_installed;
+
+/*
+ * Timer ack for an R4k-compatible timer of a known frequency.
+ */
+static void c0_timer_ack(void)
+{
+	write_c0_compare(read_c0_compare());
+}
+
+/*
+ * Possibly handle a performance counter interrupt.
+ * Return true if the timer interrupt should not be checked
+ */
+static inline int handle_perf_irq(int r2)
+{
+	/*
+	 * The performance counter overflow interrupt may be shared with the
+	 * timer interrupt (cp0_perfcount_irq < 0). If it is and a
+	 * performance counter has overflowed (perf_irq() == IRQ_HANDLED)
+	 * and we can't reliably determine if a counter interrupt has also
+	 * happened (!r2) then don't check for a timer interrupt.
+	 */
+	return (cp0_perfcount_irq < 0) &&
+		perf_irq() == IRQ_HANDLED &&
+		!r2;
+}
+
+static irqreturn_t c0_compare_interrupt(int irq, void *dev_id)
+{
+	const int r2 = cpu_has_mips_r2;
+	struct clock_event_device *cd;
+	int cpu = smp_processor_id();
+
+	/*
+	 * Suckage alert:
+	 * Before R2 of the architecture there was no way to see if a
+	 * performance counter interrupt was pending, so we have to run
+	 * the performance counter interrupt handler anyway.
+	 */
+	if (handle_perf_irq(r2))
+		goto out;
+
+	/*
+	 * The same applies to performance counter interrupts.  But with the
+	 * above we now know that the reason we got here must be a timer
+	 * interrupt.  Being the paranoiacs we are we check anyway.
+	 */
+	if (!r2 || (read_c0_cause() & (1 << 30))) {
+		c0_timer_ack();
+#ifdef CONFIG_MIPS_MT_SMTC
+		if (cpu_data[cpu].vpe_id)
+			goto out;
+		cpu = 0;
+#endif
+		cd = &per_cpu(mips_clockevent_device, cpu);
+		cd->event_handler(cd);
+	}
+
+out:
+	return IRQ_HANDLED;
+}
+
+static struct irqaction c0_compare_irqaction = {
+	.handler = c0_compare_interrupt,
+#ifdef CONFIG_MIPS_MT_SMTC
+	.flags = IRQF_DISABLED,
+#else
+	.flags = IRQF_DISABLED | IRQF_PERCPU,
+#endif
+	.name = "timer",
+};
+
+#ifdef CONFIG_MIPS_MT_SMTC
+DEFINE_PER_CPU(struct clock_event_device, smtc_dummy_clockevent_device);
+
+static void smtc_set_mode(enum clock_event_mode mode,
+                          struct clock_event_device *evt)
+{
+}
+
+static void mips_broadcast(cpumask_t mask)
+{
+	unsigned int cpu;
+
+	for_each_cpu_mask(cpu, mask)
+		smtc_send_ipi(cpu, SMTC_CLOCK_TICK, 0);
+}
+
+static void setup_smtc_dummy_clockevent_device(void)
+{
+	//uint64_t mips_freq = mips_hpt_^frequency;
+	unsigned int cpu = smp_processor_id();
+	struct clock_event_device *cd;
+
+	cd = &per_cpu(smtc_dummy_clockevent_device, cpu);
+
+	cd->name		= "SMTC";
+	cd->features		= CLOCK_EVT_FEAT_DUMMY;
+
+	/* Calculate the min / max delta */
+	cd->mult	= 0; //div_sc((unsigned long) mips_freq, NSEC_PER_SEC, 32);
+	cd->shift		= 0; //32;
+	cd->max_delta_ns	= 0; //clockevent_delta2ns(0x7fffffff, cd);
+	cd->min_delta_ns	= 0; //clockevent_delta2ns(0x30, cd);
+
+	cd->rating		= 200;
+	cd->irq			= 17; //-1;
+//	if (cpu)
+//		cd->cpumask	= CPU_MASK_ALL; // cpumask_of_cpu(cpu);
+//	else
+		cd->cpumask	= cpumask_of_cpu(cpu);
+
+	cd->set_mode		= smtc_set_mode;
+
+	cd->broadcast		= mips_broadcast;
+
+	clockevents_register_device(cd);
+}
+#endif
+
+static void mips_event_handler(struct clock_event_device *dev)
+{
+}
+
+/*
+ * FIXME: This doesn't hold for the relocated E9000 compare interrupt.
+ */
+static int c0_compare_int_pending(void)
+{
+	return (read_c0_cause() >> cp0_compare_irq) & 0x100;
+}
+
+static int c0_compare_int_usable(void)
+{
+	const unsigned int delta = 0x300000;
+	unsigned int cnt;
+
+	/*
+	 * IP7 already pending?  Try to clear it by acking the timer.
+	 */
+	if (c0_compare_int_pending()) {
+		write_c0_compare(read_c0_compare());
+		irq_disable_hazard();
+		if (c0_compare_int_pending())
+			return 0;
+	}
+
+	cnt = read_c0_count();
+	cnt += delta;
+	write_c0_compare(cnt);
+
+	while ((long)(read_c0_count() - cnt) <= 0)
+		;	/* Wait for expiry  */
+
+	if (!c0_compare_int_pending())
+		return 0;
+
+	write_c0_compare(read_c0_compare());
+	irq_disable_hazard();
+	if (c0_compare_int_pending())
+		return 0;
+
+	/*
+	 * Feels like a real count / compare timer.
+	 */
+	return 1;
+}
+
+void __cpuinit mips_clockevent_init(void)
+{
+	uint64_t mips_freq = mips_hpt_frequency;
+	unsigned int cpu = smp_processor_id();
+	struct clock_event_device *cd;
+	unsigned int irq = MIPS_CPU_IRQ_BASE + 7;
+
+	if (!cpu_has_counter)
+		return;
+
+#ifdef CONFIG_MIPS_MT_SMTC
+	setup_smtc_dummy_clockevent_device();
+
+	/*
+	 * On SMTC we only register VPE0's compare interrupt as clockevent
+	 * device.
+	 */
+	if (cpu)
+		return;
+#endif
+
+	if (!c0_compare_int_usable())
+		return;
+
+	cd = &per_cpu(mips_clockevent_device, cpu);
+
+	cd->name		= "MIPS";
+	cd->features		= CLOCK_EVT_FEAT_ONESHOT;
+
+	/* Calculate the min / max delta */
+	cd->mult	= div_sc((unsigned long) mips_freq, NSEC_PER_SEC, 32);
+	cd->shift		= 32;
+	cd->max_delta_ns	= clockevent_delta2ns(0x7fffffff, cd);
+	cd->min_delta_ns	= clockevent_delta2ns(0x300, cd);
+
+	cd->rating		= 300;
+	cd->irq			= irq;
+#ifdef CONFIG_MIPS_MT_SMTC
+	cd->cpumask		= CPU_MASK_ALL;
+#else
+	cd->cpumask		= cpumask_of_cpu(cpu);
+#endif
+	cd->set_next_event	= mips_next_event;
+	cd->set_mode		= mips_set_mode;
+	cd->event_handler	= mips_event_handler;
+
+	clockevents_register_device(cd);
+
+	if (!cp0_timer_irq_installed) {
+#ifdef CONFIG_MIPS_MT_SMTC
+#define CPUCTR_IMASKBIT (0x100 << cp0_compare_irq)
+		setup_irq_smtc(irq, &c0_compare_irqaction, CPUCTR_IMASKBIT);
+#else
+		setup_irq(irq, &c0_compare_irqaction);
+#endif /* CONFIG_MIPS_MT_SMTC */
+		cp0_timer_irq_installed = 1;
+	}
+}
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index bf164a5..2367687 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -27,16 +27,6 @@
 
 #include <kernel-entry-init.h>
 
-	.macro	ARC64_TWIDDLE_PC
-#if defined(CONFIG_ARC64) || defined(CONFIG_MAPPED_KERNEL)
-	/* We get launched at a XKPHYS address but the kernel is linked to
-	   run at a KSEG0 address, so jump there.  */
-	PTR_LA	t0, \@f
-	jr	t0
-\@:
-#endif
-	.endm
-
 	/*
 	 * inputs are the text nasid in t1, data nasid in t2.
 	 */
@@ -157,7 +147,11 @@ NESTED(kernel_entry, 16, sp)			# kernel entry point
 
 	setup_c0_status_pri
 
-	ARC64_TWIDDLE_PC
+	/* We might not get launched at the address the kernel is linked to,
+	   so we jump there.  */
+	PTR_LA	t0, 0f
+	jr	t0
+0:
 
 #ifdef CONFIG_MIPS_MT_SMTC
 	/*
diff --git a/arch/mips/kernel/time.c b/arch/mips/kernel/time.c
index e4b5e64..ea7cfe7 100644
--- a/arch/mips/kernel/time.c
+++ b/arch/mips/kernel/time.c
@@ -72,14 +72,6 @@ int update_persistent_clock(struct timespec now)
 	return rtc_mips_set_mmss(now.tv_sec);
 }
 
-/* how many counter cycles in a jiffy */
-static unsigned long cycles_per_jiffy __read_mostly;
-
-/*
- * Null timer ack for systems not needing one (e.g. i8254).
- */
-static void null_timer_ack(void) { /* nothing */ }
-
 /*
  * Null high precision timer functions for systems lacking one.
  */
@@ -89,14 +81,6 @@ static cycle_t null_hpt_read(void)
 }
 
 /*
- * Timer ack for an R4k-compatible timer of a known frequency.
- */
-static void c0_timer_ack(void)
-{
-	write_c0_compare(read_c0_compare());
-}
-
-/*
  * High precision timer functions for a R4k-compatible timer.
  */
 static cycle_t c0_hpt_read(void)
@@ -105,7 +89,6 @@ static cycle_t c0_hpt_read(void)
 }
 
 int (*mips_timer_state)(void);
-void (*mips_timer_ack)(void);
 
 /*
  * local_timer_interrupt() does profiling and process accounting
@@ -135,35 +118,6 @@ int (*perf_irq)(void) = null_perf_irq;
 EXPORT_SYMBOL(perf_irq);
 
 /*
- * Timer interrupt
- */
-int cp0_compare_irq;
-
-/*
- * Performance counter IRQ or -1 if shared with timer
- */
-int cp0_perfcount_irq;
-EXPORT_SYMBOL_GPL(cp0_perfcount_irq);
-
-/*
- * Possibly handle a performance counter interrupt.
- * Return true if the timer interrupt should not be checked
- */
-static inline int handle_perf_irq(int r2)
-{
-	/*
-	 * The performance counter overflow interrupt may be shared with the
-	 * timer interrupt (cp0_perfcount_irq < 0). If it is and a
-	 * performance counter has overflowed (perf_irq() == IRQ_HANDLED)
-	 * and we can't reliably determine if a counter interrupt has also
-	 * happened (!r2) then don't check for a timer interrupt.
-	 */
-	return (cp0_perfcount_irq < 0) &&
-		perf_irq() == IRQ_HANDLED &&
-		!r2;
-}
-
-/*
  * time_init() - it does the following things.
  *
  * 1) plat_time_init() -
@@ -228,84 +182,6 @@ struct clocksource clocksource_mips = {
 	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
-static int mips_next_event(unsigned long delta,
-                           struct clock_event_device *evt)
-{
-	unsigned int cnt;
-	int res;
-
-#ifdef CONFIG_MIPS_MT_SMTC
-	{
-	unsigned long flags, vpflags;
-	local_irq_save(flags);
-	vpflags = dvpe();
-#endif
-	cnt = read_c0_count();
-	cnt += delta;
-	write_c0_compare(cnt);
-	res = ((long)(read_c0_count() - cnt ) > 0) ? -ETIME : 0;
-#ifdef CONFIG_MIPS_MT_SMTC
-	evpe(vpflags);
-	local_irq_restore(flags);
-	}
-#endif
-	return res;
-}
-
-static void mips_set_mode(enum clock_event_mode mode,
-                          struct clock_event_device *evt)
-{
-	/* Nothing to do ...  */
-}
-
-static DEFINE_PER_CPU(struct clock_event_device, mips_clockevent_device);
-static int cp0_timer_irq_installed;
-
-static irqreturn_t timer_interrupt(int irq, void *dev_id)
-{
-	const int r2 = cpu_has_mips_r2;
-	struct clock_event_device *cd;
-	int cpu = smp_processor_id();
-
-	/*
-	 * Suckage alert:
-	 * Before R2 of the architecture there was no way to see if a
-	 * performance counter interrupt was pending, so we have to run
-	 * the performance counter interrupt handler anyway.
-	 */
-	if (handle_perf_irq(r2))
-		goto out;
-
-	/*
-	 * The same applies to performance counter interrupts.  But with the
-	 * above we now know that the reason we got here must be a timer
-	 * interrupt.  Being the paranoiacs we are we check anyway.
-	 */
-	if (!r2 || (read_c0_cause() & (1 << 30))) {
-		c0_timer_ack();
-#ifdef CONFIG_MIPS_MT_SMTC
-		if (cpu_data[cpu].vpe_id)
-			goto out;
-		cpu = 0;
-#endif
-		cd = &per_cpu(mips_clockevent_device, cpu);
-		cd->event_handler(cd);
-	}
-
-out:
-	return IRQ_HANDLED;
-}
-
-static struct irqaction timer_irqaction = {
-	.handler = timer_interrupt,
-#ifdef CONFIG_MIPS_MT_SMTC
-	.flags = IRQF_DISABLED,
-#else
-	.flags = IRQF_DISABLED | IRQF_PERCPU,
-#endif
-	.name = "timer",
-};
-
 static void __init init_mips_clocksource(void)
 {
 	u64 temp;
@@ -345,8 +221,6 @@ static void smtc_set_mode(enum clock_event_mode mode,
 {
 }
 
-int dummycnt[NR_CPUS];
-
 static void mips_broadcast(cpumask_t mask)
 {
 	unsigned int cpu;
@@ -387,113 +261,6 @@ static void setup_smtc_dummy_clockevent_device(void)
 }
 #endif
 
-static void mips_event_handler(struct clock_event_device *dev)
-{
-}
-
-/*
- * FIXME: This doesn't hold for the relocated E9000 compare interrupt.
- */
-static int c0_compare_int_pending(void)
-{
-	return (read_c0_cause() >> cp0_compare_irq) & 0x100;
-}
-
-static int c0_compare_int_usable(void)
-{
-	const unsigned int delta = 0x300000;
-	unsigned int cnt;
-
-	/*
-	 * IP7 already pending?  Try to clear it by acking the timer.
-	 */
-	if (c0_compare_int_pending()) {
-		write_c0_compare(read_c0_compare());
-		irq_disable_hazard();
-		if (c0_compare_int_pending())
-			return 0;
-	}
-
-	cnt = read_c0_count();
-	cnt += delta;
-	write_c0_compare(cnt);
-
-	while ((long)(read_c0_count() - cnt) <= 0)
-		;	/* Wait for expiry  */
-
-	if (!c0_compare_int_pending())
-		return 0;
-
-	write_c0_compare(read_c0_compare());
-	irq_disable_hazard();
-	if (c0_compare_int_pending())
-		return 0;
-
-	/*
-	 * Feels like a real count / compare timer.
-	 */
-	return 1;
-}
-
-void __cpuinit mips_clockevent_init(void)
-{
-	uint64_t mips_freq = mips_hpt_frequency;
-	unsigned int cpu = smp_processor_id();
-	struct clock_event_device *cd;
-	unsigned int irq = MIPS_CPU_IRQ_BASE + 7;
-
-	if (!cpu_has_counter)
-		return;
-
-#ifdef CONFIG_MIPS_MT_SMTC
-	setup_smtc_dummy_clockevent_device();
-
-	/*
-	 * On SMTC we only register VPE0's compare interrupt as clockevent
-	 * device.
-	 */
-	if (cpu)
-		return;
-#endif
-
-	if (!c0_compare_int_usable())
-		return;
-
-	cd = &per_cpu(mips_clockevent_device, cpu);
-
-	cd->name		= "MIPS";
-	cd->features		= CLOCK_EVT_FEAT_ONESHOT;
-
-	/* Calculate the min / max delta */
-	cd->mult	= div_sc((unsigned long) mips_freq, NSEC_PER_SEC, 32);
-	cd->shift		= 32;
-	cd->max_delta_ns	= clockevent_delta2ns(0x7fffffff, cd);
-	cd->min_delta_ns	= clockevent_delta2ns(0x300, cd);
-
-	cd->rating		= 300;
-	cd->irq			= irq;
-#ifdef CONFIG_MIPS_MT_SMTC
-	cd->cpumask		= CPU_MASK_ALL;
-#else
-	cd->cpumask		= cpumask_of_cpu(cpu);
-#endif
-	cd->set_next_event	= mips_next_event;
-	cd->set_mode		= mips_set_mode;
-	cd->event_handler	= mips_event_handler;
-
-	clockevents_register_device(cd);
-
-	if (!cp0_timer_irq_installed) {
-#ifdef CONFIG_MIPS_MT_SMTC
-#define CPUCTR_IMASKBIT (0x100 << cp0_compare_irq)
-		setup_irq_smtc(irq, &timer_irqaction, CPUCTR_IMASKBIT);
-#else
-		setup_irq(irq, &timer_irqaction);
-#endif /* CONFIG_MIPS_MT_SMTC */
-		cp0_timer_irq_installed = 1;
-	}
-}
-
 void __init time_init(void)
 {
 	plat_time_init();
@@ -512,14 +279,6 @@ void __init time_init(void)
 		if (!clocksource_mips.read) {
 			/* No external high precision timer -- use R4k.  */
 			clocksource_mips.read = c0_hpt_read;
-
-			if (!mips_timer_state) {
-				/* No external timer interrupt -- use R4k.  */
-				mips_timer_ack = c0_timer_ack;
-				/* Calculate cache parameters.  */
-				cycles_per_jiffy =
-					(mips_hpt_frequency + HZ / 2) / HZ;
-			}
 		}
 		if (!mips_hpt_frequency)
 			mips_hpt_frequency = calibrate_hpt();
@@ -528,29 +287,8 @@ void __init time_init(void)
 		printk("Using %u.%03u MHz high precision timer.\n",
 		       ((mips_hpt_frequency + 500) / 1000) / 1000,
 		       ((mips_hpt_frequency + 500) / 1000) % 1000);
-
-#ifdef CONFIG_IRQ_CPU
-		setup_irq(MIPS_CPU_IRQ_BASE + 7, &timer_irqaction);
-#endif
 	}
 
-	if (!mips_timer_ack)
-		/* No timer interrupt ack (e.g. i8254).  */
-		mips_timer_ack = null_timer_ack;
-
-	/*
-	 * Call board specific timer interrupt setup.
-	 *
-	 * this pointer must be setup in machine setup routine.
-	 *
-	 * Even if a machine chooses to use a low-level timer interrupt,
-	 * it still needs to setup the timer_irqaction.
-	 * In that case, it might be better to set timer_irqaction.handler
-	 * to be NULL function so that we are sure the high-level code
-	 * is not invoked accidentally.
-	 */
-	plat_timer_setup(&timer_irqaction);
-
 	init_mips_clocksource();
 	mips_clockevent_init();
 }
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index bbf01b8..7b78d13 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1336,6 +1336,17 @@ extern void cpu_cache_init(void);
 extern void tlb_init(void);
 extern void flush_tlb_handlers(void);
 
+/*
+ * Timer interrupt
+ */
+int cp0_compare_irq;
+
+/*
+ * Performance counter IRQ or -1 if shared with timer
+ */
+int cp0_perfcount_irq;
+EXPORT_SYMBOL_GPL(cp0_perfcount_irq);
+
 void __init per_cpu_trap_init(void)
 {
 	unsigned int cpu = smp_processor_id();
diff --git a/arch/mips/pmc-sierra/Kconfig b/arch/mips/pmc-sierra/Kconfig
index abbd0bb..6b293ce 100644
--- a/arch/mips/pmc-sierra/Kconfig
+++ b/arch/mips/pmc-sierra/Kconfig
@@ -4,11 +4,13 @@ choice
 
 config PMC_MSP4200_EVAL
 	bool "PMC-Sierra MSP4200 Eval Board"
+	select CEVT_R4K
 	select IRQ_MSP_SLP
 	select HW_HAS_PCI
 
 config PMC_MSP4200_GW
 	bool "PMC-Sierra MSP4200 VoIP Gateway"
+	select CEVT_R4K
 	select IRQ_MSP_SLP
 	select HW_HAS_PCI
 
diff --git a/arch/mips/sgi-ip27/ip27-irq.c b/arch/mips/sgi-ip27/ip27-irq.c
index 856649c..1bb692a 100644
--- a/arch/mips/sgi-ip27/ip27-irq.c
+++ b/arch/mips/sgi-ip27/ip27-irq.c
@@ -374,14 +374,13 @@ int __devinit request_bridge_irq(struct bridge_controller *bc)
 	return irq;
 }
 
-extern void ip27_rt_timer_interrupt(void);
-
 asmlinkage void plat_irq_dispatch(void)
 {
 	unsigned long pending = read_c0_cause() & read_c0_status();
+	extern unsigned int rt_timer_irq;
 
 	if (pending & CAUSEF_IP4)
-		ip27_rt_timer_interrupt();
+		do_IRQ(rt_timer_irq);
 	else if (pending & CAUSEF_IP2)	/* PI_INT_PEND_0 or CC_PEND_{A|B} */
 		ip27_do_irq_mask0();
 	else if (pending & CAUSEF_IP3)	/* PI_INT_PEND_1 */
diff --git a/arch/mips/sgi-ip27/ip27-timer.c b/arch/mips/sgi-ip27/ip27-timer.c
index b7b3479..d467bf4 100644
--- a/arch/mips/sgi-ip27/ip27-timer.c
+++ b/arch/mips/sgi-ip27/ip27-timer.c
@@ -3,6 +3,7 @@
  * Copytight (C) 1999, 2000 Silicon Graphics, Inc.
  */
 #include <linux/bcd.h>
+#include <linux/clockchips.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
@@ -25,22 +26,8 @@
 #include <asm/sn/sn0/ip27.h>
 #include <asm/sn/sn0/hub.h>
 
-/*
- * This is a hack; we really need to figure these values out dynamically
- *
- * Since 800 ns works very well with various HUB frequencies, such as
- * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
- *
- * Ralf: which clock rate is used to feed the counter?
- */
-#define NSEC_PER_CYCLE		800
-#define CYCLES_PER_SEC		(NSEC_PER_SEC/NSEC_PER_CYCLE)
-#define CYCLES_PER_JIFFY	(CYCLES_PER_SEC/HZ)
-
 #define TICK_SIZE (tick_nsec / 1000)
 
-static unsigned long ct_cur[NR_CPUS];	/* What counter should be at next timer irq */
-
 #if 0
 static int set_rtc_mmss(unsigned long nowtime)
 {
@@ -86,36 +73,6 @@ static int set_rtc_mmss(unsigned long nowtime)
 }
 #endif
 
-static unsigned int rt_timer_irq;
-
-void ip27_rt_timer_interrupt(void)
-{
-	int cpu = smp_processor_id();
-	int cpuA = cputoslice(cpu) == 0;
-	unsigned int irq = rt_timer_irq;
-
-	irq_enter();
-	write_seqlock(&xtime_lock);
-
-again:
-	LOCAL_HUB_S(cpuA ? PI_RT_PEND_A : PI_RT_PEND_B, 0);	/* Ack  */
-	ct_cur[cpu] += CYCLES_PER_JIFFY;
-	LOCAL_HUB_S(cpuA ? PI_RT_COMPARE_A : PI_RT_COMPARE_B, ct_cur[cpu]);
-
-	if (LOCAL_HUB_L(PI_RT_COUNT) >= ct_cur[cpu])
-		goto again;
-
-	kstat_this_cpu.irqs[irq]++;		/* kstat only for bootcpu? */
-
-	if (cpu == 0)
-		do_timer(1);
-
-	update_process_times(user_mode(get_irq_regs()));
-
-	write_sequnlock(&xtime_lock);
-	irq_exit();
-}
-
 /* Includes for ioc3_init().  */
 #include <asm/sn/types.h>
 #include <asm/sn/sn0/addrs.h>
@@ -154,6 +111,46 @@ unsigned long read_persistent_clock(void)
         return mktime(year, month, date, hour, min, sec);
 }
 
+static int rt_set_next_event(unsigned long delta,
+		struct clock_event_device *evt)
+{
+	unsigned int cpu = smp_processor_id();
+	int slice = cputoslice(cpu) == 0;
+	unsigned long cnt;
+
+	cnt = LOCAL_HUB_L(PI_RT_COUNT);
+	cnt += delta;
+	LOCAL_HUB_S(slice ? PI_RT_COMPARE_A : PI_RT_COMPARE_B, cnt);
+
+	return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
+}
+
+static void rt_set_mode(enum clock_event_mode mode,
+		struct clock_event_device *evt)
+{
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		/* The only mode supported */
+		break;
+
+	case CLOCK_EVT_MODE_UNUSED:
+	case CLOCK_EVT_MODE_SHUTDOWN:
+	case CLOCK_EVT_MODE_ONESHOT:
+	case CLOCK_EVT_MODE_RESUME:
+		/* Nothing to do  */
+		break;
+	}
+}
+
+struct clock_event_device rt_clock_event_device = {
+	.name		= "HUB-RT",
+	.features	= CLOCK_EVT_FEAT_ONESHOT,
+
+	.rating		= 300,
+	.set_next_event	= rt_set_next_event,
+	.set_mode	= rt_set_mode,
+};
+
 static void enable_rt_irq(unsigned int irq)
 {
 }
@@ -171,6 +168,20 @@ static struct irq_chip rt_irq_type = {
 	.eoi		= enable_rt_irq,
 };
 
+unsigned int rt_timer_irq;
+
+static irqreturn_t ip27_rt_timer_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *cd = &rt_clock_event_device;
+	unsigned int cpu = smp_processor_id();
+	int slice = cputoslice(cpu) == 0;
+
+	LOCAL_HUB_S(slice ? PI_RT_PEND_A : PI_RT_PEND_B, 0);	/* Ack  */
+	cd->event_handler(cd);
+
+	return IRQ_HANDLED;
+}
+
 static struct irqaction rt_irqaction = {
 	.handler	= (irq_handler_t) ip27_rt_timer_interrupt,
 	.flags		= IRQF_DISABLED,
@@ -178,26 +189,43 @@ static struct irqaction rt_irqaction = {
 	.name		= "timer"
 };
 
-void __init plat_timer_setup(struct irqaction *irq)
+/*
+ * This is a hack; we really need to figure these values out dynamically
+ *
+ * Since 800 ns works very well with various HUB frequencies, such as
+ * 360, 380, 390 and 400 MHZ, we use 800 ns rtc cycle time.
+ *
+ * Ralf: which clock rate is used to feed the counter?
+ */
+#define NSEC_PER_CYCLE		800
+#define CYCLES_PER_SEC		(NSEC_PER_SEC / NSEC_PER_CYCLE)
+
+static void __init ip27_rt_clock_event_init(void)
 {
-	int irqno  = allocate_irqno();
+	struct clock_event_device *cd = &rt_clock_event_device;
+	unsigned int cpu = smp_processor_id();
+	int irq = allocate_irqno();
 
-	if (irqno < 0)
+	if (irq < 0)
 		panic("Can't allocate interrupt number for timer interrupt");
 
-	set_irq_chip_and_handler(irqno, &rt_irq_type, handle_percpu_irq);
+	rt_timer_irq = irq;
 
-	/* over-write the handler, we use our own way */
-	irq->handler = no_action;
+	cd->irq			= irq,
+	cd->cpumask		= cpumask_of_cpu(cpu),
 
-	/* setup irqaction */
-	irq_desc[irqno].status |= IRQ_PER_CPU;
-
-	rt_timer_irq = irqno;
 	/*
-	 * Only needed to get /proc/interrupt to display timer irq stats
+	 * Calculate the min / max delta
 	 */
-	setup_irq(irqno, &rt_irqaction);
+	cd->mult        	=
+		div_sc((unsigned long) CYCLES_PER_SEC, NSEC_PER_SEC, 32);
+	cd->shift               = 32;
+	cd->max_delta_ns        = clockevent_delta2ns(0x7fffffff, cd);
+	cd->min_delta_ns        = clockevent_delta2ns(0x300, cd);
+	clockevents_register_device(cd);
+
+	set_irq_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
+	setup_irq(irq, &rt_irqaction);
 }
 
 static cycle_t hub_rt_read(void)
@@ -206,7 +234,7 @@ static cycle_t hub_rt_read(void)
 }
 
 struct clocksource ht_rt_clocksource = {
-	.name	= "HUB",
+	.name	= "HUB-RT",
 	.rating	= 200,
 	.read	= hub_rt_read,
 	.mask	= CLOCKSOURCE_MASK(52),
@@ -214,11 +242,17 @@ struct clocksource ht_rt_clocksource = {
 	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
-void __init plat_time_init(void)
+static void __init ip27_rt_clocksource_init(void)
 {
 	clocksource_register(&ht_rt_clocksource);
 }
 
+void __init plat_time_init(void)
+{
+	ip27_rt_clock_event_init();
+	ip27_rt_clocksource_init();
+}
+
 void __init cpu_time_init(void)
 {
 	lboard_t *board;
@@ -248,17 +282,12 @@ void __init hub_rtc_init(cnodeid_t cnode)
 	 * node and timeouts will not happen there.
 	 */
 	if (get_compact_nodeid() == cnode) {
-		int cpu = smp_processor_id();
 		LOCAL_HUB_S(PI_RT_EN_A, 1);
 		LOCAL_HUB_S(PI_RT_EN_B, 1);
 		LOCAL_HUB_S(PI_PROF_EN_A, 0);
 		LOCAL_HUB_S(PI_PROF_EN_B, 0);
-		ct_cur[cpu] = CYCLES_PER_JIFFY;
-		LOCAL_HUB_S(PI_RT_COMPARE_A, ct_cur[cpu]);
 		LOCAL_HUB_S(PI_RT_COUNT, 0);
 		LOCAL_HUB_S(PI_RT_PEND_A, 0);
-		LOCAL_HUB_S(PI_RT_COMPARE_B, ct_cur[cpu]);
-		LOCAL_HUB_S(PI_RT_COUNT, 0);
 		LOCAL_HUB_S(PI_RT_PEND_B, 0);
 	}
 }
diff --git a/arch/mips/sgi-ip32/ip32-setup.c b/arch/mips/sgi-ip32/ip32-setup.c
index fc75bfc..1024bf4 100644
--- a/arch/mips/sgi-ip32/ip32-setup.c
+++ b/arch/mips/sgi-ip32/ip32-setup.c
@@ -80,12 +80,6 @@ void __init plat_time_init(void)
 	printk("%d MHz CPU detected\n", mips_hpt_frequency * 2 / 1000000);
 }
 
-void __init plat_timer_setup(struct irqaction *irq)
-{
-	irq->handler = no_action;
-	setup_irq(MIPS_CPU_IRQ_BASE + 7, irq);
-}
-
 void __init plat_mem_setup(void)
 {
 	board_be_init = ip32_be_init;
diff --git a/arch/mips/vr41xx/Kconfig b/arch/mips/vr41xx/Kconfig
index 8f4d3e7..eeb089f 100644
--- a/arch/mips/vr41xx/Kconfig
+++ b/arch/mips/vr41xx/Kconfig
@@ -5,6 +5,7 @@ choice
 
 config CASIO_E55
 	bool "CASIO CASSIOPEIA E-10/15/55/65"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select IRQ_CPU
 	select ISA
@@ -13,6 +14,7 @@ config CASIO_E55
 
 config IBM_WORKPAD
 	bool "IBM WorkPad z50"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select IRQ_CPU
 	select ISA
@@ -21,6 +23,7 @@ config IBM_WORKPAD
 
 config NEC_CMBVR4133
 	bool "NEC CMB-VR4133"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select IRQ_CPU
 	select HW_HAS_PCI
@@ -29,6 +32,7 @@ config NEC_CMBVR4133
 
 config TANBAC_TB022X
 	bool "TANBAC VR4131 multichip module and TANBAC VR4131DIMM"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select IRQ_CPU
 	select HW_HAS_PCI
@@ -43,6 +47,7 @@ config TANBAC_TB022X
 
 config VICTOR_MPC30X
 	bool "Victor MP-C303/304"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select IRQ_CPU
 	select HW_HAS_PCI
@@ -52,6 +57,7 @@ config VICTOR_MPC30X
 
 config ZAO_CAPCELLA
 	bool "ZAO Networks Capcella"
+	select CEVT_R4K
 	select DMA_NONCOHERENT
 	select IRQ_CPU
 	select HW_HAS_PCI
diff --git a/include/asm-mips/mach-ip27/kernel-entry-init.h b/include/asm-mips/mach-ip27/kernel-entry-init.h
index c1a1031..624d66c 100644
--- a/include/asm-mips/mach-ip27/kernel-entry-init.h
+++ b/include/asm-mips/mach-ip27/kernel-entry-init.h
@@ -46,7 +46,14 @@
 	lh	t1, KV_RO_NASID_OFFSET(t0)
 	lh	t2, KV_RW_NASID_OFFSET(t0)
 	MAPPED_KERNEL_SETUP_TLB
-	ARC64_TWIDDLE_PC
+
+	/*
+	 * We might not get launched at the address the kernel is linked to,
+	 * so we jump there.
+	 */
+	PTR_LA  t0, 0f
+	jr      t0
+0:
 	.endm
 
 #endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */
diff --git a/include/asm-mips/time.h b/include/asm-mips/time.h
index 35555bd..cf76f4f 100644
--- a/include/asm-mips/time.h
+++ b/include/asm-mips/time.h
@@ -40,7 +40,6 @@ extern int rtc_mips_set_mmss(unsigned long);
  * mips_timer_ack may be NULL if the interrupt is self-recoverable.
  */
 extern int (*mips_timer_state)(void);
-extern void (*mips_timer_ack)(void);
 
 /*
  * High precision timer clocksource.
@@ -76,6 +75,12 @@ extern int (*perf_irq)(void);
 /*
  * Initialize the calling CPU's compare interrupt as clockevent device
  */
+#ifdef CONFIG_CEVT_R4K
 extern void mips_clockevent_init(void);
+#else
+static inline void mips_clockevent_init(void)
+{
+}
+#endif
 
 #endif /* _ASM_TIME_H */