Merge with ARM SMP tree

config LOCAL_TIMERS

config LOCAL_TIMERS

	bool "Use local timer interrupts"

	bool "Use local timer interrupts"

	depends on SMP && n

	depends on SMP && REALVIEW_MPCORE

	default y

	default y

	help

	help

	  Enable support for local timers on SMP platforms, rather then the

	  Enable support for local timers on SMP platforms, rather then the

obj-y					:= core.o clock.o

obj-y					:= core.o clock.o

obj-$(CONFIG_MACH_REALVIEW_EB)		+= realview_eb.o

obj-$(CONFIG_MACH_REALVIEW_EB)		+= realview_eb.o

obj-$(CONFIG_SMP)			+= platsmp.o headsmp.o

obj-$(CONFIG_SMP)			+= platsmp.o headsmp.o

obj-$(CONFIG_HOTPLUG_CPU)		+= hotplug.o

obj-$(CONFIG_LOCAL_TIMERS)		+= localtimer.o

	timer_tick(regs);

	timer_tick(regs);

#ifdef CONFIG_SMP

#if defined(CONFIG_SMP) && !defined(CONFIG_LOCAL_TIMERS)

	smp_send_timer();

	smp_send_timer();

	update_process_times(user_mode(regs));

	update_process_times(user_mode(regs));

#endif

#endif

/*

 *  linux/arch/arm/mach-realview/hotplug.c

 *

 *  Copyright (C) 2002 ARM Ltd.

 *  All Rights Reserved

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/smp.h>

#include <linux/completion.h>

extern volatile int pen_release;

static DECLARE_COMPLETION(cpu_killed);

static inline void cpu_enter_lowpower(void)

{

	unsigned int v;

	asm volatile(	"mcr	p15, 0, %1, c7, c14, 0\n"

	"	mcr	p15, 0, %1, c7, c5, 0\n"

	"	mcr	p15, 0, %1, c7, c10, 4\n"

	/*

	 * Turn off coherency

	 */

	"	mrc	p15, 0, %0, c1, c0, 1\n"

	"	bic	%0, %0, #0x20\n"

	"	mcr	p15, 0, %0, c1, c0, 1\n"

	"	mrc	p15, 0, %0, c1, c0, 0\n"

	"	bic	%0, %0, #0x04\n"

	"	mcr	p15, 0, %0, c1, c0, 0\n"

	  : "=&r" (v)

	  : "r" (0)

	  : "cc");

}

static inline void cpu_leave_lowpower(void)

{

	unsigned int v;

	asm volatile(	"mrc	p15, 0, %0, c1, c0, 0\n"

	"	orr	%0, %0, #0x04\n"

	"	mcr	p15, 0, %0, c1, c0, 0\n"

	"	mrc	p15, 0, %0, c1, c0, 1\n"

	"	orr	%0, %0, #0x20\n"

	"	mcr	p15, 0, %0, c1, c0, 1\n"

	  : "=&r" (v)

	  :

	  : "cc");

}

static inline void platform_do_lowpower(unsigned int cpu)

{

	/*

	 * there is no power-control hardware on this platform, so all

	 * we can do is put the core into WFI; this is safe as the calling

	 * code will have already disabled interrupts

	 */

	for (;;) {

		/*

		 * here's the WFI

		 */

		asm(".word	0xe320f003\n"

		    :

		    :

		    : "memory", "cc");

		if (pen_release == cpu) {

			/*

			 * OK, proper wakeup, we're done

			 */

			break;

		}

		/*

		 * getting here, means that we have come out of WFI without

		 * having been woken up - this shouldn't happen

		 *

		 * The trouble is, letting people know about this is not really

		 * possible, since we are currently running incoherently, and

		 * therefore cannot safely call printk() or anything else

		 */

#ifdef DEBUG

		printk("CPU%u: spurious wakeup call\n", cpu);

#endif

	}

}

int platform_cpu_kill(unsigned int cpu)

{

	return wait_for_completion_timeout(&cpu_killed, 5000);

}

/*

 * platform-specific code to shutdown a CPU

 *

 * Called with IRQs disabled

 */

void platform_cpu_die(unsigned int cpu)

{

#ifdef DEBUG

	unsigned int this_cpu = hard_smp_processor_id();

	if (cpu != this_cpu) {

		printk(KERN_CRIT "Eek! platform_cpu_die running on %u, should be %u\n",

			   this_cpu, cpu);

		BUG();

	}

#endif

	printk(KERN_NOTICE "CPU%u: shutdown\n", cpu);

	complete(&cpu_killed);

	/*

	 * we're ready for shutdown now, so do it

	 */

	cpu_enter_lowpower();

	platform_do_lowpower(cpu);

	/*

	 * bring this CPU back into the world of cache

	 * coherency, and then restore interrupts

	 */

	cpu_leave_lowpower();

}

int mach_cpu_disable(unsigned int cpu)

{

	/*

	 * we don't allow CPU 0 to be shutdown (it is still too special

	 * e.g. clock tick interrupts)

	 */

	return cpu == 0 ? -EPERM : 0;

}

/*

 *  linux/arch/arm/mach-realview/localtimer.c

 *

 *  Copyright (C) 2002 ARM Ltd.

 *  All Rights Reserved

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/smp.h>

#include <asm/mach/time.h>

#include <asm/hardware/arm_twd.h>

#include <asm/hardware/gic.h>

#include <asm/hardware.h>

#include <asm/io.h>

#include <asm/irq.h>

#include "core.h"

#define TWD_BASE(cpu)	(__io_address(REALVIEW_TWD_BASE) + \

			 ((cpu) * REALVIEW_TWD_SIZE))

static unsigned long mpcore_timer_rate;

/*

 * local_timer_ack: checks for a local timer interrupt.

 *

 * If a local timer interrupt has occured, acknowledge and return 1.

 * Otherwise, return 0.

 */

int local_timer_ack(void)

{

	void __iomem *base = TWD_BASE(smp_processor_id());

	if (__raw_readl(base + TWD_TIMER_INTSTAT)) {

		__raw_writel(1, base + TWD_TIMER_INTSTAT);

		return 1;

	}

	return 0;

}

void __cpuinit local_timer_setup(unsigned int cpu)

{

	void __iomem *base = TWD_BASE(cpu);

	unsigned int load, offset;

	u64 waitjiffies;

	unsigned int count;

	/*

	 * 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, base + TWD_TIMER_CONTROL);

				 /* maximum value */

		__raw_writel(0xFFFFFFFFU, base + TWD_TIMER_COUNTER);

		while (get_jiffies_64() < waitjiffies)

			udelay(10);

		count = __raw_readl(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, base + TWD_TIMER_LOAD);

	__raw_writel(0x7,  base + TWD_TIMER_CONTROL);

	/*

	 * Now maneuver our local tick into the right part of the jiffy.

	 * Start by working out where within the tick our local timer

	 * interrupt should go.

	 */

	offset = ((mpcore_timer_rate / HZ) / (NR_CPUS + 1)) * (cpu + 1);

	/*

	 * gettimeoffset() will return a number of us since the last tick.

	 * Convert this number of us to a local timer tick count.

	 * Be careful of integer overflow whilst keeping maximum precision.

	 *

	 * with HZ=100 and 1MHz (fpga) ~ 1GHz processor:

	 * load = 1 ~ 10,000

	 * mpcore_timer_rate/10000 = 100 ~ 100,000

	 *

	 * so the multiply value will be less than 10^9 always.

	 */

	load = (system_timer->offset() * (mpcore_timer_rate / 10000)) / 100;

	/* Add on our offset to get the load value */

	load = (load + offset) % (mpcore_timer_rate / HZ);

	__raw_writel(load, base + TWD_TIMER_COUNTER);

	/* Make sure our local interrupt controller has this enabled */

	__raw_writel(1 << IRQ_LOCALTIMER,

		     __io_address(REALVIEW_GIC_DIST_BASE) + GIC_DIST_ENABLE_SET);

}

/*

 * take a local timer down

 */

void __cpuexit local_timer_stop(unsigned int cpu)

{

	__raw_writel(0, TWD_BASE(cpu) + TWD_TIMER_CONTROL);

}