arch/mips/loongson/loongson-3/smp.c - maze/linux - Git at Google

 /*
  * Copyright (C) 2010, 2011, 2012, Lemote, Inc.
  * Author: Chen Huacai, chenhc@lemote.com
  *
  * 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 option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  */

 #include <linux/init.h>
 #include <linux/cpu.h>
 #include <linux/sched.h>
 #include <linux/smp.h>
 #include <linux/cpufreq.h>
 #include <asm/processor.h>
 #include <asm/time.h>
 #include <asm/clock.h>
 #include <asm/tlbflush.h>
 #include <asm/cacheflush.h>
 #include <loongson.h>

 #include "smp.h"

 DEFINE_PER_CPU(int, cpu_state);
 DEFINE_PER_CPU(uint32_t, core0_c0count);

 /* read a 32bit value from ipi register */
 #define loongson3_ipi_read32(addr) readl(addr)
 /* read a 64bit value from ipi register */
 #define loongson3_ipi_read64(addr) readq(addr)
 /* write a 32bit value to ipi register */
 #define loongson3_ipi_write32(action, addr)	\
 	do {					\
 		writel(action, addr);		\
 		__wbflush();			\
 	} while (0)
 /* write a 64bit value to ipi register */
 #define loongson3_ipi_write64(action, addr)	\
 	do {					\
 		writeq(action, addr);		\
 		__wbflush();			\
 	} while (0)

 static void *ipi_set0_regs[] = {
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + SET0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + SET0),
 };

 static void *ipi_clear0_regs[] = {
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + CLEAR0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + CLEAR0),
 };

 static void *ipi_status0_regs[] = {
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + STATUS0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + STATUS0),
 };

 static void *ipi_en0_regs[] = {
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + EN0),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + EN0),
 };

 static void *ipi_mailbox_buf[] = {
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + BUF),
 	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + BUF),
 };

 /*
  * Simple enough, just poke the appropriate ipi register
  */
 static void loongson3_send_ipi_single(int cpu, unsigned int action)
 {
 	loongson3_ipi_write32((u32)action, ipi_set0_regs[cpu]);
 }

 static void
 loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action)
 {
 	unsigned int i;

 	for_each_cpu(i, mask)
 		loongson3_ipi_write32((u32)action, ipi_set0_regs[i]);
 }

 void loongson3_ipi_interrupt(struct pt_regs *regs)
 {
 	int i, cpu = smp_processor_id();
 	unsigned int action, c0count;

 	/* Load the ipi register to figure out what we're supposed to do */
 	action = loongson3_ipi_read32(ipi_status0_regs[cpu]);

 	/* Clear the ipi register to clear the interrupt */
 	loongson3_ipi_write32((u32)action, ipi_clear0_regs[cpu]);

 	if (action & SMP_RESCHEDULE_YOURSELF)
 		scheduler_ipi();

 	if (action & SMP_CALL_FUNCTION)
 		smp_call_function_interrupt();

 	if (action & SMP_ASK_C0COUNT) {
 		BUG_ON(cpu != 0);
 		c0count = read_c0_count();
 		for (i = 1; i < loongson_sysconf.nr_cpus; i++)
 			per_cpu(core0_c0count, i) = c0count;
 	}
 }

 #define MAX_LOOPS 1111
 /*
  * SMP init and finish on secondary CPUs
  */
 static void loongson3_init_secondary(void)
 {
 	int i;
 	uint32_t initcount;
 	unsigned int cpu = smp_processor_id();
 	unsigned int imask = STATUSF_IP7 | STATUSF_IP6 |
 			     STATUSF_IP3 | STATUSF_IP2;

 	/* Set interrupt mask, but don't enable */
 	change_c0_status(ST0_IM, imask);

 	for (i = 0; i < loongson_sysconf.nr_cpus; i++)
 		loongson3_ipi_write32(0xffffffff, ipi_en0_regs[i]);

 	per_cpu(cpu_state, cpu) = CPU_ONLINE;

 	i = 0;
 	__get_cpu_var(core0_c0count) = 0;
 	loongson3_send_ipi_single(0, SMP_ASK_C0COUNT);
 	while (!__get_cpu_var(core0_c0count)) {
 		i++;
 		cpu_relax();
 	}

 	if (i > MAX_LOOPS)
 		i = MAX_LOOPS;
 	initcount = __get_cpu_var(core0_c0count) + i;
 	write_c0_count(initcount);
 }

 static void loongson3_smp_finish(void)
 {
 	write_c0_compare(read_c0_count() + mips_hpt_frequency/HZ);
 	local_irq_enable();
 	loongson3_ipi_write64(0,
 			(void *)(ipi_mailbox_buf[smp_processor_id()]+0x0));
 	pr_info("CPU#%d finished, CP0_ST=%x\n",
 			smp_processor_id(), read_c0_status());
 }

 static void __init loongson3_smp_setup(void)
 {
 	int i, num;

 	init_cpu_possible(cpu_none_mask);
 	set_cpu_possible(0, true);

 	__cpu_number_map[0] = 0;
 	__cpu_logical_map[0] = 0;

 	/* For unified kernel, NR_CPUS is the maximum possible value,
 	 * loongson_sysconf.nr_cpus is the really present value */
 	for (i = 1, num = 0; i < loongson_sysconf.nr_cpus; i++) {
 		set_cpu_possible(i, true);
 		__cpu_number_map[i] = ++num;
 		__cpu_logical_map[num] = i;
 	}
 	pr_info("Detected %i available secondary CPU(s)\n", num);
 }

 static void __init loongson3_prepare_cpus(unsigned int max_cpus)
 {
 	init_cpu_present(cpu_possible_mask);
 	per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
 }

 /*
  * Setup the PC, SP, and GP of a secondary processor and start it runing!
  */
 static void loongson3_boot_secondary(int cpu, struct task_struct *idle)
 {
 	unsigned long startargs[4];

 	pr_info("Booting CPU#%d...\n", cpu);

 	/* startargs[] are initial PC, SP and GP for secondary CPU */
 	startargs[0] = (unsigned long)&smp_bootstrap;
 	startargs[1] = (unsigned long)__KSTK_TOS(idle);
 	startargs[2] = (unsigned long)task_thread_info(idle);
 	startargs[3] = 0;

 	pr_debug("CPU#%d, func_pc=%lx, sp=%lx, gp=%lx\n",
 			cpu, startargs[0], startargs[1], startargs[2]);

 	loongson3_ipi_write64(startargs[3], (void *)(ipi_mailbox_buf[cpu]+0x18));
 	loongson3_ipi_write64(startargs[2], (void *)(ipi_mailbox_buf[cpu]+0x10));
 	loongson3_ipi_write64(startargs[1], (void *)(ipi_mailbox_buf[cpu]+0x8));
 	loongson3_ipi_write64(startargs[0], (void *)(ipi_mailbox_buf[cpu]+0x0));
 }

 /*
  * Final cleanup after all secondaries booted
  */
 static void __init loongson3_cpus_done(void)
 {
 }

 #ifdef CONFIG_HOTPLUG_CPU

 static int loongson3_cpu_disable(void)
 {
 	unsigned long flags;
 	unsigned int cpu = smp_processor_id();

 	if (cpu == 0)
 		return -EBUSY;

 	set_cpu_online(cpu, false);
 	cpu_clear(cpu, cpu_callin_map);
 	local_irq_save(flags);
 	fixup_irqs();
 	local_irq_restore(flags);
 	flush_cache_all();
 	local_flush_tlb_all();

 	return 0;
 }


 static void loongson3_cpu_die(unsigned int cpu)
 {
 	while (per_cpu(cpu_state, cpu) != CPU_DEAD)
 		cpu_relax();

 	mb();
 }

 /* To shutdown a core in Loongson 3, the target core should go to CKSEG1 and
  * flush all L1 entries at first. Then, another core (usually Core 0) can
  * safely disable the clock of the target core. loongson3_play_dead() is
  * called via CKSEG1 (uncached and unmmaped) */
 static void loongson3_play_dead(int *state_addr)
 {
 	register int val;
 	register long cpuid, core, node, count;
 	register void *addr, *base, *initfunc;

 	__asm__ __volatile__(
 		"   .set push                     \n"
 		"   .set noreorder                \n"
 		"   li %[addr], 0x80000000        \n" /* KSEG0 */
 		"1: cache 0, 0(%[addr])           \n" /* flush L1 ICache */
 		"   cache 0, 1(%[addr])           \n"
 		"   cache 0, 2(%[addr])           \n"
 		"   cache 0, 3(%[addr])           \n"
 		"   cache 1, 0(%[addr])           \n" /* flush L1 DCache */
 		"   cache 1, 1(%[addr])           \n"
 		"   cache 1, 2(%[addr])           \n"
 		"   cache 1, 3(%[addr])           \n"
 		"   addiu %[sets], %[sets], -1    \n"
 		"   bnez  %[sets], 1b             \n"
 		"   addiu %[addr], %[addr], 0x20  \n"
 		"   li    %[val], 0x7             \n" /* *state_addr = CPU_DEAD; */
 		"   sw    %[val], (%[state_addr]) \n"
 		"   sync                          \n"
 		"   cache 21, (%[state_addr])     \n" /* flush entry of *state_addr */
 		"   .set pop                      \n"
 		: [addr] "=&r" (addr), [val] "=&r" (val)
 		: [state_addr] "r" (state_addr),
 		  [sets] "r" (cpu_data[smp_processor_id()].dcache.sets));

 	__asm__ __volatile__(
 		"   .set push                         \n"
 		"   .set noreorder                    \n"
 		"   .set mips64                       \n"
 		"   mfc0  %[cpuid], $15, 1            \n"
 		"   andi  %[cpuid], 0x3ff             \n"
 		"   dli   %[base], 0x900000003ff01000 \n"
 		"   andi  %[core], %[cpuid], 0x3      \n"
 		"   sll   %[core], 8                  \n" /* get core id */
 		"   or    %[base], %[base], %[core]   \n"
 		"   andi  %[node], %[cpuid], 0xc      \n"
 		"   dsll  %[node], 42                 \n" /* get node id */
 		"   or    %[base], %[base], %[node]   \n"
 		"1: li    %[count], 0x100             \n" /* wait for init loop */
 		"2: bnez  %[count], 2b                \n" /* limit mailbox access */
 		"   addiu %[count], -1                \n"
 		"   ld    %[initfunc], 0x20(%[base])  \n" /* get PC via mailbox */
 		"   beqz  %[initfunc], 1b             \n"
 		"   nop                               \n"
 		"   ld    $sp, 0x28(%[base])          \n" /* get SP via mailbox */
 		"   ld    $gp, 0x30(%[base])          \n" /* get GP via mailbox */
 		"   ld    $a1, 0x38(%[base])          \n"
 		"   jr    %[initfunc]                 \n" /* jump to initial PC */
 		"   nop                               \n"
 		"   .set pop                          \n"
 		: [core] "=&r" (core), [node] "=&r" (node),
 		  [base] "=&r" (base), [cpuid] "=&r" (cpuid),
 		  [count] "=&r" (count), [initfunc] "=&r" (initfunc)
 		: /* No Input */
 		: "a1");
 }

 void play_dead(void)
 {
 	int *state_addr;
 	unsigned int cpu = smp_processor_id();
 	void (*play_dead_at_ckseg1)(int *);

 	idle_task_exit();
 	play_dead_at_ckseg1 =
 		(void *)CKSEG1ADDR((unsigned long)loongson3_play_dead);
 	state_addr = &per_cpu(cpu_state, cpu);
 	mb();
 	play_dead_at_ckseg1(state_addr);
 }

 #define CPU_POST_DEAD_FROZEN	(CPU_POST_DEAD | CPU_TASKS_FROZEN)
 static int loongson3_cpu_callback(struct notifier_block *nfb,
 	unsigned long action, void *hcpu)
 {
 	unsigned int cpu = (unsigned long)hcpu;

 	switch (action) {
 	case CPU_POST_DEAD:
 	case CPU_POST_DEAD_FROZEN:
 		pr_info("Disable clock for CPU#%d\n", cpu);
 		LOONGSON_CHIPCFG0 &= ~(1 << (12 + cpu));
 		break;
 	case CPU_UP_PREPARE:
 	case CPU_UP_PREPARE_FROZEN:
 		pr_info("Enable clock for CPU#%d\n", cpu);
 		LOONGSON_CHIPCFG0 |= 1 << (12 + cpu);
 		break;
 	}

 	return NOTIFY_OK;
 }

 static int register_loongson3_notifier(void)
 {
 	hotcpu_notifier(loongson3_cpu_callback, 0);
 	return 0;
 }
 early_initcall(register_loongson3_notifier);

 #endif

 struct plat_smp_ops loongson3_smp_ops = {
 	.send_ipi_single = loongson3_send_ipi_single,
 	.send_ipi_mask = loongson3_send_ipi_mask,
 	.init_secondary = loongson3_init_secondary,
 	.smp_finish = loongson3_smp_finish,
 	.cpus_done = loongson3_cpus_done,
 	.boot_secondary = loongson3_boot_secondary,
 	.smp_setup = loongson3_smp_setup,
 	.prepare_cpus = loongson3_prepare_cpus,
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_disable = loongson3_cpu_disable,
 	.cpu_die = loongson3_cpu_die,
 #endif
 };
	/*
	* Copyright (C) 2010, 2011, 2012, Lemote, Inc.
	* Author: Chen Huacai, chenhc@lemote.com
	*
	* 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 option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*/

	#include <linux/init.h>
	#include <linux/cpu.h>
	#include <linux/sched.h>
	#include <linux/smp.h>
	#include <linux/cpufreq.h>
	#include <asm/processor.h>
	#include <asm/time.h>
	#include <asm/clock.h>
	#include <asm/tlbflush.h>
	#include <asm/cacheflush.h>
	#include <loongson.h>

	#include "smp.h"

	DEFINE_PER_CPU(int, cpu_state);
	DEFINE_PER_CPU(uint32_t, core0_c0count);

	/* read a 32bit value from ipi register */
	#define loongson3_ipi_read32(addr) readl(addr)
	/* read a 64bit value from ipi register */
	#define loongson3_ipi_read64(addr) readq(addr)
	/* write a 32bit value to ipi register */
	#define loongson3_ipi_write32(action, addr) \
	do { \
	writel(action, addr); \
	__wbflush(); \
	} while (0)
	/* write a 64bit value to ipi register */
	#define loongson3_ipi_write64(action, addr) \
	do { \
	writeq(action, addr); \
	__wbflush(); \
	} while (0)

	static void *ipi_set0_regs[] = {
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + SET0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + SET0),
	};

	static void *ipi_clear0_regs[] = {
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + CLEAR0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + CLEAR0),
	};

	static void *ipi_status0_regs[] = {
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + STATUS0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + STATUS0),
	};

	static void *ipi_en0_regs[] = {
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + EN0),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + EN0),
	};

	static void *ipi_mailbox_buf[] = {
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE0_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE1_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE2_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP0_BASE + SMP_CORE3_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE0_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE1_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE2_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP1_BASE + SMP_CORE3_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE0_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE1_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE2_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP2_BASE + SMP_CORE3_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE0_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE1_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE2_OFFSET + BUF),
	(void *)(SMP_CORE_GROUP3_BASE + SMP_CORE3_OFFSET + BUF),
	};

	/*
	* Simple enough, just poke the appropriate ipi register
	*/
	static void loongson3_send_ipi_single(int cpu, unsigned int action)
	{
	loongson3_ipi_write32((u32)action, ipi_set0_regs[cpu]);
	}

	static void
	loongson3_send_ipi_mask(const struct cpumask *mask, unsigned int action)
	{
	unsigned int i;

	for_each_cpu(i, mask)
	loongson3_ipi_write32((u32)action, ipi_set0_regs[i]);
	}

	void loongson3_ipi_interrupt(struct pt_regs *regs)
	{
	int i, cpu = smp_processor_id();
	unsigned int action, c0count;

	/* Load the ipi register to figure out what we're supposed to do */
	action = loongson3_ipi_read32(ipi_status0_regs[cpu]);

	/* Clear the ipi register to clear the interrupt */
	loongson3_ipi_write32((u32)action, ipi_clear0_regs[cpu]);

	if (action & SMP_RESCHEDULE_YOURSELF)
	scheduler_ipi();

	if (action & SMP_CALL_FUNCTION)
	smp_call_function_interrupt();

	if (action & SMP_ASK_C0COUNT) {
	BUG_ON(cpu != 0);
	c0count = read_c0_count();
	for (i = 1; i < loongson_sysconf.nr_cpus; i++)
	per_cpu(core0_c0count, i) = c0count;
	}
	}

	#define MAX_LOOPS 1111
	/*
	* SMP init and finish on secondary CPUs
	*/
	static void loongson3_init_secondary(void)
	{
	int i;
	uint32_t initcount;
	unsigned int cpu = smp_processor_id();
	unsigned int imask = STATUSF_IP7 \| STATUSF_IP6 \|
	STATUSF_IP3 \| STATUSF_IP2;

	/* Set interrupt mask, but don't enable */
	change_c0_status(ST0_IM, imask);

	for (i = 0; i < loongson_sysconf.nr_cpus; i++)
	loongson3_ipi_write32(0xffffffff, ipi_en0_regs[i]);

	per_cpu(cpu_state, cpu) = CPU_ONLINE;

	i = 0;
	__get_cpu_var(core0_c0count) = 0;
	loongson3_send_ipi_single(0, SMP_ASK_C0COUNT);
	while (!__get_cpu_var(core0_c0count)) {
	i++;
	cpu_relax();
	}

	if (i > MAX_LOOPS)
	i = MAX_LOOPS;
	initcount = __get_cpu_var(core0_c0count) + i;
	write_c0_count(initcount);
	}

	static void loongson3_smp_finish(void)
	{
	write_c0_compare(read_c0_count() + mips_hpt_frequency/HZ);
	local_irq_enable();
	loongson3_ipi_write64(0,
	(void *)(ipi_mailbox_buf[smp_processor_id()]+0x0));
	pr_info("CPU#%d finished, CP0_ST=%x\n",
	smp_processor_id(), read_c0_status());
	}

	static void __init loongson3_smp_setup(void)
	{
	int i, num;

	init_cpu_possible(cpu_none_mask);
	set_cpu_possible(0, true);

	__cpu_number_map[0] = 0;
	__cpu_logical_map[0] = 0;

	/* For unified kernel, NR_CPUS is the maximum possible value,
	* loongson_sysconf.nr_cpus is the really present value */
	for (i = 1, num = 0; i < loongson_sysconf.nr_cpus; i++) {
	set_cpu_possible(i, true);
	__cpu_number_map[i] = ++num;
	__cpu_logical_map[num] = i;
	}
	pr_info("Detected %i available secondary CPU(s)\n", num);
	}

	static void __init loongson3_prepare_cpus(unsigned int max_cpus)
	{
	init_cpu_present(cpu_possible_mask);
	per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
	}

	/*
	* Setup the PC, SP, and GP of a secondary processor and start it runing!
	*/
	static void loongson3_boot_secondary(int cpu, struct task_struct *idle)
	{
	unsigned long startargs[4];

	pr_info("Booting CPU#%d...\n", cpu);

	/* startargs[] are initial PC, SP and GP for secondary CPU */
	startargs[0] = (unsigned long)&smp_bootstrap;
	startargs[1] = (unsigned long)__KSTK_TOS(idle);
	startargs[2] = (unsigned long)task_thread_info(idle);
	startargs[3] = 0;

	pr_debug("CPU#%d, func_pc=%lx, sp=%lx, gp=%lx\n",
	cpu, startargs[0], startargs[1], startargs[2]);

	loongson3_ipi_write64(startargs[3], (void *)(ipi_mailbox_buf[cpu]+0x18));
	loongson3_ipi_write64(startargs[2], (void *)(ipi_mailbox_buf[cpu]+0x10));
	loongson3_ipi_write64(startargs[1], (void *)(ipi_mailbox_buf[cpu]+0x8));
	loongson3_ipi_write64(startargs[0], (void *)(ipi_mailbox_buf[cpu]+0x0));
	}

	/*
	* Final cleanup after all secondaries booted
	*/
	static void __init loongson3_cpus_done(void)
	{
	}

	#ifdef CONFIG_HOTPLUG_CPU

	static int loongson3_cpu_disable(void)
	{
	unsigned long flags;
	unsigned int cpu = smp_processor_id();

	if (cpu == 0)
	return -EBUSY;

	set_cpu_online(cpu, false);
	cpu_clear(cpu, cpu_callin_map);
	local_irq_save(flags);
	fixup_irqs();
	local_irq_restore(flags);
	flush_cache_all();
	local_flush_tlb_all();

	return 0;
	}


	static void loongson3_cpu_die(unsigned int cpu)
	{
	while (per_cpu(cpu_state, cpu) != CPU_DEAD)
	cpu_relax();

	mb();
	}

	/* To shutdown a core in Loongson 3, the target core should go to CKSEG1 and
	* flush all L1 entries at first. Then, another core (usually Core 0) can
	* safely disable the clock of the target core. loongson3_play_dead() is
	* called via CKSEG1 (uncached and unmmaped) */
	static void loongson3_play_dead(int *state_addr)
	{
	register int val;
	register long cpuid, core, node, count;
	register void addr, base, *initfunc;

	__asm__ __volatile__(
	" .set push \n"
	" .set noreorder \n"
	" li %[addr], 0x80000000 \n" /* KSEG0 */
	"1: cache 0, 0(%[addr]) \n" /* flush L1 ICache */
	" cache 0, 1(%[addr]) \n"
	" cache 0, 2(%[addr]) \n"
	" cache 0, 3(%[addr]) \n"
	" cache 1, 0(%[addr]) \n" /* flush L1 DCache */
	" cache 1, 1(%[addr]) \n"
	" cache 1, 2(%[addr]) \n"
	" cache 1, 3(%[addr]) \n"
	" addiu %[sets], %[sets], -1 \n"
	" bnez %[sets], 1b \n"
	" addiu %[addr], %[addr], 0x20 \n"
	" li %[val], 0x7 \n" /* state_addr = CPU_DEAD; /
	" sw %[val], (%[state_addr]) \n"
	" sync \n"
	" cache 21, (%[state_addr]) \n" /* flush entry of state_addr /
	" .set pop \n"
	: [addr] "=&r" (addr), [val] "=&r" (val)
	: [state_addr] "r" (state_addr),
	[sets] "r" (cpu_data[smp_processor_id()].dcache.sets));

	__asm__ __volatile__(
	" .set push \n"
	" .set noreorder \n"
	" .set mips64 \n"
	" mfc0 %[cpuid], $15, 1 \n"
	" andi %[cpuid], 0x3ff \n"
	" dli %[base], 0x900000003ff01000 \n"
	" andi %[core], %[cpuid], 0x3 \n"
	" sll %[core], 8 \n" /* get core id */
	" or %[base], %[base], %[core] \n"
	" andi %[node], %[cpuid], 0xc \n"
	" dsll %[node], 42 \n" /* get node id */
	" or %[base], %[base], %[node] \n"
	"1: li %[count], 0x100 \n" /* wait for init loop */
	"2: bnez %[count], 2b \n" /* limit mailbox access */
	" addiu %[count], -1 \n"
	" ld %[initfunc], 0x20(%[base]) \n" /* get PC via mailbox */
	" beqz %[initfunc], 1b \n"
	" nop \n"
	" ld $sp, 0x28(%[base]) \n" /* get SP via mailbox */
	" ld $gp, 0x30(%[base]) \n" /* get GP via mailbox */
	" ld $a1, 0x38(%[base]) \n"
	" jr %[initfunc] \n" /* jump to initial PC */
	" nop \n"
	" .set pop \n"
	: [core] "=&r" (core), [node] "=&r" (node),
	[base] "=&r" (base), [cpuid] "=&r" (cpuid),
	[count] "=&r" (count), [initfunc] "=&r" (initfunc)
	: /* No Input */
	: "a1");
	}

	void play_dead(void)
	{
	int *state_addr;
	unsigned int cpu = smp_processor_id();
	void (play_dead_at_ckseg1)(int );

	idle_task_exit();
	play_dead_at_ckseg1 =
	(void *)CKSEG1ADDR((unsigned long)loongson3_play_dead);
	state_addr = &per_cpu(cpu_state, cpu);
	mb();
	play_dead_at_ckseg1(state_addr);
	}

	#define CPU_POST_DEAD_FROZEN (CPU_POST_DEAD \| CPU_TASKS_FROZEN)
	static int loongson3_cpu_callback(struct notifier_block *nfb,
	unsigned long action, void *hcpu)
	{
	unsigned int cpu = (unsigned long)hcpu;

	switch (action) {
	case CPU_POST_DEAD:
	case CPU_POST_DEAD_FROZEN:
	pr_info("Disable clock for CPU#%d\n", cpu);
	LOONGSON_CHIPCFG0 &= ~(1 << (12 + cpu));
	break;
	case CPU_UP_PREPARE:
	case CPU_UP_PREPARE_FROZEN:
	pr_info("Enable clock for CPU#%d\n", cpu);
	LOONGSON_CHIPCFG0 \|= 1 << (12 + cpu);
	break;
	}

	return NOTIFY_OK;
	}

	static int register_loongson3_notifier(void)
	{
	hotcpu_notifier(loongson3_cpu_callback, 0);
	return 0;
	}
	early_initcall(register_loongson3_notifier);

	#endif

	struct plat_smp_ops loongson3_smp_ops = {
	.send_ipi_single = loongson3_send_ipi_single,
	.send_ipi_mask = loongson3_send_ipi_mask,
	.init_secondary = loongson3_init_secondary,
	.smp_finish = loongson3_smp_finish,
	.cpus_done = loongson3_cpus_done,
	.boot_secondary = loongson3_boot_secondary,
	.smp_setup = loongson3_smp_setup,
	.prepare_cpus = loongson3_prepare_cpus,
	#ifdef CONFIG_HOTPLUG_CPU
	.cpu_disable = loongson3_cpu_disable,
	.cpu_die = loongson3_cpu_die,
	#endif
	};