[deliverable/linux.git] / arch / mips / cavium-octeon / smp.c

/*
 * 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) 2004-2008, 2009, 2010 Cavium Networks
 */
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/sched.h>
#include <linux/module.h>

#include <asm/mmu_context.h>
#include <asm/time.h>
#include <asm/setup.h>

#include <asm/octeon/octeon.h>

#include "octeon_boot.h"

volatile unsigned long octeon_processor_boot = 0xff;
volatile unsigned long octeon_processor_sp;
volatile unsigned long octeon_processor_gp;

#ifdef CONFIG_HOTPLUG_CPU
uint64_t octeon_bootloader_entry_addr;
EXPORT_SYMBOL(octeon_bootloader_entry_addr);
#endif

static void octeon_icache_flush(void)
{
	asm volatile ("synci 0($0)\n");
}

static void (*octeon_message_functions[8])(void) = {
	scheduler_ipi,
	generic_smp_call_function_interrupt,
	octeon_icache_flush,
};

static irqreturn_t mailbox_interrupt(int irq, void *dev_id)
{
	u64 mbox_clrx = CVMX_CIU_MBOX_CLRX(cvmx_get_core_num());
	u64 action;
	int i;

	/*
	 * Make sure the function array initialization remains
	 * correct.
	 */
	BUILD_BUG_ON(SMP_RESCHEDULE_YOURSELF != (1 << 0));
	BUILD_BUG_ON(SMP_CALL_FUNCTION       != (1 << 1));
	BUILD_BUG_ON(SMP_ICACHE_FLUSH        != (1 << 2));

	/*
	 * Load the mailbox register to figure out what we're supposed
	 * to do.
	 */
	action = cvmx_read_csr(mbox_clrx);

	if (OCTEON_IS_MODEL(OCTEON_CN68XX))
		action &= 0xff;
	else
		action &= 0xffff;

	/* Clear the mailbox to clear the interrupt */
	cvmx_write_csr(mbox_clrx, action);

	for (i = 0; i < ARRAY_SIZE(octeon_message_functions) && action;) {
		if (action & 1) {
			void (*fn)(void) = octeon_message_functions[i];

			if (fn)
				fn();
		}
		action >>= 1;
		i++;
	}
	return IRQ_HANDLED;
}

/**
 * Cause the function described by call_data to be executed on the passed
 * cpu.	 When the function has finished, increment the finished field of
 * call_data.
 */
void octeon_send_ipi_single(int cpu, unsigned int action)
{
	int coreid = cpu_logical_map(cpu);
	/*
	pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu,
	       coreid, action);
	*/
	cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
}

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

	for_each_cpu(i, mask)
		octeon_send_ipi_single(i, action);
}

/**
 * Detect available CPUs, populate cpu_possible_mask
 */
static void octeon_smp_hotplug_setup(void)
{
#ifdef CONFIG_HOTPLUG_CPU
	struct linux_app_boot_info *labi;

	if (!setup_max_cpus)
		return;

	labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
	if (labi->labi_signature != LABI_SIGNATURE) {
		pr_info("The bootloader on this board does not support HOTPLUG_CPU.");
		return;
	}

	octeon_bootloader_entry_addr = labi->InitTLBStart_addr;
#endif
}

static void __init octeon_smp_setup(void)
{
	const int coreid = cvmx_get_core_num();
	int cpus;
	int id;
	struct cvmx_sysinfo *sysinfo = cvmx_sysinfo_get();

#ifdef CONFIG_HOTPLUG_CPU
	int core_mask = octeon_get_boot_coremask();
	unsigned int num_cores = cvmx_octeon_num_cores();
#endif

	/* The present CPUs are initially just the boot cpu (CPU 0). */
	for (id = 0; id < NR_CPUS; id++) {
		set_cpu_possible(id, id == 0);
		set_cpu_present(id, id == 0);
	}

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

	/* The present CPUs get the lowest CPU numbers. */
	cpus = 1;
	for (id = 0; id < NR_CPUS; id++) {
		if ((id != coreid) && cvmx_coremask_is_core_set(&sysinfo->core_mask, id)) {
			set_cpu_possible(cpus, true);
			set_cpu_present(cpus, true);
			__cpu_number_map[id] = cpus;
			__cpu_logical_map[cpus] = id;
			cpus++;
		}
	}

#ifdef CONFIG_HOTPLUG_CPU
	/*
	 * The possible CPUs are all those present on the chip.	 We
	 * will assign CPU numbers for possible cores as well.	Cores
	 * are always consecutively numberd from 0.
	 */
	for (id = 0; setup_max_cpus && octeon_bootloader_entry_addr &&
		     id < num_cores && id < NR_CPUS; id++) {
		if (!(core_mask & (1 << id))) {
			set_cpu_possible(cpus, true);
			__cpu_number_map[id] = cpus;
			__cpu_logical_map[cpus] = id;
			cpus++;
		}
	}
#endif

	octeon_smp_hotplug_setup();
}

/**
 * Firmware CPU startup hook
 *
 */
static void octeon_boot_secondary(int cpu, struct task_struct *idle)
{
	int count;

	pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu,
		cpu_logical_map(cpu));

	octeon_processor_sp = __KSTK_TOS(idle);
	octeon_processor_gp = (unsigned long)(task_thread_info(idle));
	octeon_processor_boot = cpu_logical_map(cpu);
	mb();

	count = 10000;
	while (octeon_processor_sp && count) {
		/* Waiting for processor to get the SP and GP */
		udelay(1);
		count--;
	}
	if (count == 0)
		pr_err("Secondary boot timeout\n");
}

/**
 * After we've done initial boot, this function is called to allow the
 * board code to clean up state, if needed
 */
static void octeon_init_secondary(void)
{
	unsigned int sr;

	sr = set_c0_status(ST0_BEV);
	write_c0_ebase((u32)ebase);
	write_c0_status(sr);

	octeon_check_cpu_bist();
	octeon_init_cvmcount();

	octeon_irq_setup_secondary();
}

/**
 * Callout to firmware before smp_init
 *
 */
static void __init octeon_prepare_cpus(unsigned int max_cpus)
{
	/*
	 * Only the low order mailbox bits are used for IPIs, leave
	 * the other bits alone.
	 */
	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffff);
	if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt,
			IRQF_PERCPU | IRQF_NO_THREAD, "SMP-IPI",
			mailbox_interrupt)) {
		panic("Cannot request_irq(OCTEON_IRQ_MBOX0)");
	}
}

/**
 * Last chance for the board code to finish SMP initialization before
 * the CPU is "online".
 */
static void octeon_smp_finish(void)
{
	octeon_user_io_init();

	/* to generate the first CPU timer interrupt */
	write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
	local_irq_enable();
}

#ifdef CONFIG_HOTPLUG_CPU

/* State of each CPU. */
DEFINE_PER_CPU(int, cpu_state);

static int octeon_cpu_disable(void)
{
	unsigned int cpu = smp_processor_id();

	if (cpu == 0)
		return -EBUSY;

	if (!octeon_bootloader_entry_addr)
		return -ENOTSUPP;

	set_cpu_online(cpu, false);
	calculate_cpu_foreign_map();
	cpumask_clear_cpu(cpu, &cpu_callin_map);
	octeon_fixup_irqs();

	__flush_cache_all();
	local_flush_tlb_all();

	return 0;
}

static void octeon_cpu_die(unsigned int cpu)
{
	int coreid = cpu_logical_map(cpu);
	uint32_t mask, new_mask;
	const struct cvmx_bootmem_named_block_desc *block_desc;

	while (per_cpu(cpu_state, cpu) != CPU_DEAD)
		cpu_relax();

	/*
	 * This is a bit complicated strategics of getting/settig available
	 * cores mask, copied from bootloader
	 */

	mask = 1 << coreid;
	/* LINUX_APP_BOOT_BLOCK is initialized in bootoct binary */
	block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);

	if (!block_desc) {
		struct linux_app_boot_info *labi;

		labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);

		labi->avail_coremask |= mask;
		new_mask = labi->avail_coremask;
	} else {		       /* alternative, already initialized */
		uint32_t *p = (uint32_t *)PHYS_TO_XKSEG_CACHED(block_desc->base_addr +
							       AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
		*p |= mask;
		new_mask = *p;
	}

	pr_info("Reset core %d. Available Coremask = 0x%x \n", coreid, new_mask);
	mb();
	cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
	cvmx_write_csr(CVMX_CIU_PP_RST, 0);
}

void play_dead(void)
{
	int cpu = cpu_number_map(cvmx_get_core_num());

	idle_task_exit();
	octeon_processor_boot = 0xff;
	per_cpu(cpu_state, cpu) = CPU_DEAD;

	mb();

	while (1)	/* core will be reset here */
		;
}

extern void kernel_entry(unsigned long arg1, ...);

static void start_after_reset(void)
{
	kernel_entry(0, 0, 0);	/* set a2 = 0 for secondary core */
}

static int octeon_update_boot_vector(unsigned int cpu)
{

	int coreid = cpu_logical_map(cpu);
	uint32_t avail_coremask;
	const struct cvmx_bootmem_named_block_desc *block_desc;
	struct boot_init_vector *boot_vect =
		(struct boot_init_vector *)PHYS_TO_XKSEG_CACHED(BOOTLOADER_BOOT_VECTOR);

	block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);

	if (!block_desc) {
		struct linux_app_boot_info *labi;

		labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);

		avail_coremask = labi->avail_coremask;
		labi->avail_coremask &= ~(1 << coreid);
	} else {		       /* alternative, already initialized */
		avail_coremask = *(uint32_t *)PHYS_TO_XKSEG_CACHED(
			block_desc->base_addr + AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
	}

	if (!(avail_coremask & (1 << coreid))) {
		/* core not available, assume, that caught by simple-executive */
		cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
		cvmx_write_csr(CVMX_CIU_PP_RST, 0);
	}

	boot_vect[coreid].app_start_func_addr =
		(uint32_t) (unsigned long) start_after_reset;
	boot_vect[coreid].code_addr = octeon_bootloader_entry_addr;

	mb();

	cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask);

	return 0;
}

static int octeon_cpu_callback(struct notifier_block *nfb,
	unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long)hcpu;

	switch (action & ~CPU_TASKS_FROZEN) {
	case CPU_UP_PREPARE:
		octeon_update_boot_vector(cpu);
		break;
	case CPU_ONLINE:
		pr_info("Cpu %d online\n", cpu);
		break;
	case CPU_DEAD:
		break;
	}

	return NOTIFY_OK;
}

static int register_cavium_notifier(void)
{
	hotcpu_notifier(octeon_cpu_callback, 0);
	return 0;
}
late_initcall(register_cavium_notifier);

#endif	/* CONFIG_HOTPLUG_CPU */

struct plat_smp_ops octeon_smp_ops = {
	.send_ipi_single	= octeon_send_ipi_single,
	.send_ipi_mask		= octeon_send_ipi_mask,
	.init_secondary		= octeon_init_secondary,
	.smp_finish		= octeon_smp_finish,
	.boot_secondary		= octeon_boot_secondary,
	.smp_setup		= octeon_smp_setup,
	.prepare_cpus		= octeon_prepare_cpus,
#ifdef CONFIG_HOTPLUG_CPU
	.cpu_disable		= octeon_cpu_disable,
	.cpu_die		= octeon_cpu_die,
#endif
};

static irqreturn_t octeon_78xx_reched_interrupt(int irq, void *dev_id)
{
	scheduler_ipi();
	return IRQ_HANDLED;
}

static irqreturn_t octeon_78xx_call_function_interrupt(int irq, void *dev_id)
{
	generic_smp_call_function_interrupt();
	return IRQ_HANDLED;
}

static irqreturn_t octeon_78xx_icache_flush_interrupt(int irq, void *dev_id)
{
	octeon_icache_flush();
	return IRQ_HANDLED;
}

/*
 * Callout to firmware before smp_init
 */
static void octeon_78xx_prepare_cpus(unsigned int max_cpus)
{
	if (request_irq(OCTEON_IRQ_MBOX0 + 0,
			octeon_78xx_reched_interrupt,
			IRQF_PERCPU | IRQF_NO_THREAD, "Scheduler",
			octeon_78xx_reched_interrupt)) {
		panic("Cannot request_irq for SchedulerIPI");
	}
	if (request_irq(OCTEON_IRQ_MBOX0 + 1,
			octeon_78xx_call_function_interrupt,
			IRQF_PERCPU | IRQF_NO_THREAD, "SMP-Call",
			octeon_78xx_call_function_interrupt)) {
		panic("Cannot request_irq for SMP-Call");
	}
	if (request_irq(OCTEON_IRQ_MBOX0 + 2,
			octeon_78xx_icache_flush_interrupt,
			IRQF_PERCPU | IRQF_NO_THREAD, "ICache-Flush",
			octeon_78xx_icache_flush_interrupt)) {
		panic("Cannot request_irq for ICache-Flush");
	}
}

static void octeon_78xx_send_ipi_single(int cpu, unsigned int action)
{
	int i;

	for (i = 0; i < 8; i++) {
		if (action & 1)
			octeon_ciu3_mbox_send(cpu, i);
		action >>= 1;
	}
}

static void octeon_78xx_send_ipi_mask(const struct cpumask *mask,
				      unsigned int action)
{
	unsigned int cpu;

	for_each_cpu(cpu, mask)
		octeon_78xx_send_ipi_single(cpu, action);
}

static struct plat_smp_ops octeon_78xx_smp_ops = {
	.send_ipi_single	= octeon_78xx_send_ipi_single,
	.send_ipi_mask		= octeon_78xx_send_ipi_mask,
	.init_secondary		= octeon_init_secondary,
	.smp_finish		= octeon_smp_finish,
	.boot_secondary		= octeon_boot_secondary,
	.smp_setup		= octeon_smp_setup,
	.prepare_cpus		= octeon_78xx_prepare_cpus,
#ifdef CONFIG_HOTPLUG_CPU
	.cpu_disable		= octeon_cpu_disable,
	.cpu_die		= octeon_cpu_die,
#endif
};

void __init octeon_setup_smp(void)
{
	struct plat_smp_ops *ops;

	if (octeon_has_feature(OCTEON_FEATURE_CIU3))
		ops = &octeon_78xx_smp_ops;
	else
		ops = &octeon_smp_ops;

	register_smp_ops(ops);
}
Commit	Line	Data
5b3b1688 DD	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
edfcbb8c	6	* Copyright (C) 2004-2008, 2009, 2010 Cavium Networks
5b3b1688	7	*/
773cb77d	8	#include <linux/cpu.h>
5b3b1688 DD	9	#include <linux/delay.h>
	10	#include <linux/smp.h>
	11	#include <linux/interrupt.h>
	12	#include <linux/kernel_stat.h>
	13	#include <linux/sched.h>
	14	#include <linux/module.h>
	15
	16	#include <asm/mmu_context.h>
5b3b1688	17	#include <asm/time.h>
b81947c6	18	#include <asm/setup.h>
5b3b1688 DD	19
	20	#include <asm/octeon/octeon.h>
	21
773cb77d RB	22	#include "octeon_boot.h"
773cb77d RB	23
5b3b1688 DD	24	volatile unsigned long octeon_processor_boot = 0xff;
	25	volatile unsigned long octeon_processor_sp;
	26	volatile unsigned long octeon_processor_gp;
	27
773cb77d	28	#ifdef CONFIG_HOTPLUG_CPU
babba4f1 DD	29	uint64_t octeon_bootloader_entry_addr;
babba4f1 DD	30	EXPORT_SYMBOL(octeon_bootloader_entry_addr);
773cb77d RB	31	#endif
773cb77d RB	32
c6d2b22e DD	33	static void octeon_icache_flush(void)
	34	{
	35	asm volatile ("synci 0($0)\n");
	36	}
	37
	38	static void (*octeon_message_functions[8])(void) = {
	39	scheduler_ipi,
	40	generic_smp_call_function_interrupt,
	41	octeon_icache_flush,
	42	};
	43
5b3b1688 DD	44	static irqreturn_t mailbox_interrupt(int irq, void *dev_id)
5b3b1688 DD	45	{
c6d2b22e DD	46	u64 mbox_clrx = CVMX_CIU_MBOX_CLRX(cvmx_get_core_num());
	47	u64 action;
	48	int i;
	49
	50	/*
	51	* Make sure the function array initialization remains
	52	* correct.
	53	*/
	54	BUILD_BUG_ON(SMP_RESCHEDULE_YOURSELF != (1 << 0));
	55	BUILD_BUG_ON(SMP_CALL_FUNCTION != (1 << 1));
	56	BUILD_BUG_ON(SMP_ICACHE_FLUSH != (1 << 2));
	57
	58	/*
	59	* Load the mailbox register to figure out what we're supposed
	60	* to do.
	61	*/
	62	action = cvmx_read_csr(mbox_clrx);
5b3b1688	63
c6d2b22e DD	64	if (OCTEON_IS_MODEL(OCTEON_CN68XX))
	65	action &= 0xff;
	66	else
	67	action &= 0xffff;
5b3b1688 DD	68
5b3b1688 DD	69	/* Clear the mailbox to clear the interrupt */
c6d2b22e	70	cvmx_write_csr(mbox_clrx, action);
5b3b1688	71
c6d2b22e DD	72	for (i = 0; i < ARRAY_SIZE(octeon_message_functions) && action;) {
	73	if (action & 1) {
	74	void (*fn)(void) = octeon_message_functions[i];
5b3b1688	75
c6d2b22e DD	76	if (fn)
	77	fn();
	78	}
	79	action >>= 1;
	80	i++;
	81	}
5b3b1688 DD	82	return IRQ_HANDLED;
	83	}
	84
	85	/**
	86	* Cause the function described by call_data to be executed on the passed
70342287	87	* cpu. When the function has finished, increment the finished field of
5b3b1688 DD	88	* call_data.
	89	*/
	90	void octeon_send_ipi_single(int cpu, unsigned int action)
	91	{
	92	int coreid = cpu_logical_map(cpu);
	93	/*
	94	pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu,
	95	coreid, action);
	96	*/
	97	cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
	98	}
	99
067f3290 DD	100	static inline void octeon_send_ipi_mask(const struct cpumask *mask,
067f3290 DD	101	unsigned int action)
5b3b1688 DD	102	{
	103	unsigned int i;
	104
8dd92891	105	for_each_cpu(i, mask)
5b3b1688 DD	106	octeon_send_ipi_single(i, action);
	107	}
	108
	109	/**
5f054e31	110	* Detect available CPUs, populate cpu_possible_mask
5b3b1688	111	*/
773cb77d RB	112	static void octeon_smp_hotplug_setup(void)
	113	{
	114	#ifdef CONFIG_HOTPLUG_CPU
babba4f1 DD	115	struct linux_app_boot_info *labi;
babba4f1 DD	116
5ca0e377 AK	117	if (!setup_max_cpus)
	118	return;
	119
babba4f1	120	labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
eac44d9c AK	121	if (labi->labi_signature != LABI_SIGNATURE) {
	122	pr_info("The bootloader on this board does not support HOTPLUG_CPU.");
	123	return;
	124	}
babba4f1 DD	125
babba4f1 DD	126	octeon_bootloader_entry_addr = labi->InitTLBStart_addr;
773cb77d RB	127	#endif
	128	}
	129
0e8c1a32	130	static void __init octeon_smp_setup(void)
5b3b1688 DD	131	{
	132	const int coreid = cvmx_get_core_num();
	133	int cpus;
	134	int id;
7d52ab16 DD	135	struct cvmx_sysinfo *sysinfo = cvmx_sysinfo_get();
7d52ab16 DD	136
edfcbb8c	137	#ifdef CONFIG_HOTPLUG_CPU
c6d2b22e	138	int core_mask = octeon_get_boot_coremask();
edfcbb8c DD	139	unsigned int num_cores = cvmx_octeon_num_cores();
	140	#endif
	141
	142	/* The present CPUs are initially just the boot cpu (CPU 0). */
	143	for (id = 0; id < NR_CPUS; id++) {
	144	set_cpu_possible(id, id == 0);
	145	set_cpu_present(id, id == 0);
	146	}
5b3b1688	147
5b3b1688 DD	148	__cpu_number_map[coreid] = 0;
5b3b1688 DD	149	__cpu_logical_map[0] = coreid;
5b3b1688	150
edfcbb8c	151	/* The present CPUs get the lowest CPU numbers. */
5b3b1688	152	cpus = 1;
edfcbb8c	153	for (id = 0; id < NR_CPUS; id++) {
7d52ab16	154	if ((id != coreid) && cvmx_coremask_is_core_set(&sysinfo->core_mask, id)) {
edfcbb8c DD	155	set_cpu_possible(cpus, true);
	156	set_cpu_present(cpus, true);
	157	__cpu_number_map[id] = cpus;
	158	__cpu_logical_map[cpus] = id;
	159	cpus++;
	160	}
	161	}
	162
	163	#ifdef CONFIG_HOTPLUG_CPU
	164	/*
70342287 RB	165	* The possible CPUs are all those present on the chip. We
70342287 RB	166	* will assign CPU numbers for possible cores as well. Cores
edfcbb8c DD	167	* are always consecutively numberd from 0.
edfcbb8c DD	168	*/
eac44d9c AK	169	for (id = 0; setup_max_cpus && octeon_bootloader_entry_addr &&
eac44d9c AK	170	id < num_cores && id < NR_CPUS; id++) {
edfcbb8c DD	171	if (!(core_mask & (1 << id))) {
edfcbb8c DD	172	set_cpu_possible(cpus, true);
5b3b1688 DD	173	__cpu_number_map[id] = cpus;
	174	__cpu_logical_map[cpus] = id;
	175	cpus++;
	176	}
	177	}
edfcbb8c	178	#endif
773cb77d RB	179
773cb77d RB	180	octeon_smp_hotplug_setup();
5b3b1688 DD	181	}
	182
	183	/**
	184	* Firmware CPU startup hook
	185	*
	186	*/
	187	static void octeon_boot_secondary(int cpu, struct task_struct *idle)
	188	{
	189	int count;
	190
	191	pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu,
	192	cpu_logical_map(cpu));
	193
	194	octeon_processor_sp = __KSTK_TOS(idle);
	195	octeon_processor_gp = (unsigned long)(task_thread_info(idle));
	196	octeon_processor_boot = cpu_logical_map(cpu);
	197	mb();
	198
	199	count = 10000;
	200	while (octeon_processor_sp && count) {
	201	/* Waiting for processor to get the SP and GP */
	202	udelay(1);
	203	count--;
	204	}
	205	if (count == 0)
	206	pr_err("Secondary boot timeout\n");
	207	}
	208
	209	/**
	210	* After we've done initial boot, this function is called to allow the
	211	* board code to clean up state, if needed
	212	*/
078a55fc	213	static void octeon_init_secondary(void)
5b3b1688	214	{
babba4f1	215	unsigned int sr;
5b3b1688	216
babba4f1 DD	217	sr = set_c0_status(ST0_BEV);
	218	write_c0_ebase((u32)ebase);
	219	write_c0_status(sr);
	220
5b3b1688 DD	221	octeon_check_cpu_bist();
5b3b1688 DD	222	octeon_init_cvmcount();
0c326387 DD	223
0c326387 DD	224	octeon_irq_setup_secondary();
5b3b1688 DD	225	}
	226
	227	/**
	228	* Callout to firmware before smp_init
	229	*
	230	*/
0e8c1a32	231	static void __init octeon_prepare_cpus(unsigned int max_cpus)
5b3b1688	232	{
e650ce0f DD	233	/*
	234	* Only the low order mailbox bits are used for IPIs, leave
	235	* the other bits alone.
	236	*/
	237	cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffff);
e63fb7a9 VS	238	if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt,
	239	IRQF_PERCPU \| IRQF_NO_THREAD, "SMP-IPI",
	240	mailbox_interrupt)) {
ab75dc02	241	panic("Cannot request_irq(OCTEON_IRQ_MBOX0)");
5b3b1688	242	}
5b3b1688 DD	243	}
	244
	245	/**
	246	* Last chance for the board code to finish SMP initialization before
	247	* the CPU is "online".
	248	*/
	249	static void octeon_smp_finish(void)
	250	{
5b3b1688 DD	251	octeon_user_io_init();
	252
	253	/* to generate the first CPU timer interrupt */
	254	write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
1bcfecc0	255	local_irq_enable();
5b3b1688 DD	256	}
5b3b1688 DD	257
773cb77d RB	258	#ifdef CONFIG_HOTPLUG_CPU
	259
	260	/* State of each CPU. */
	261	DEFINE_PER_CPU(int, cpu_state);
	262
773cb77d RB	263	static int octeon_cpu_disable(void)
	264	{
	265	unsigned int cpu = smp_processor_id();
	266
	267	if (cpu == 0)
	268	return -EBUSY;
	269
eac44d9c AK	270	if (!octeon_bootloader_entry_addr)
	271	return -ENOTSUPP;
	272
0b5f9c00	273	set_cpu_online(cpu, false);
826e99be	274	calculate_cpu_foreign_map();
8dd92891	275	cpumask_clear_cpu(cpu, &cpu_callin_map);
17efb59a	276	octeon_fixup_irqs();
773cb77d	277
9329c154	278	__flush_cache_all();
773cb77d RB	279	local_flush_tlb_all();
773cb77d RB	280
773cb77d RB	281	return 0;
	282	}
	283
	284	static void octeon_cpu_die(unsigned int cpu)
	285	{
	286	int coreid = cpu_logical_map(cpu);
babba4f1 DD	287	uint32_t mask, new_mask;
babba4f1 DD	288	const struct cvmx_bootmem_named_block_desc *block_desc;
773cb77d	289
773cb77d RB	290	while (per_cpu(cpu_state, cpu) != CPU_DEAD)
	291	cpu_relax();
	292
	293	/*
	294	* This is a bit complicated strategics of getting/settig available
	295	* cores mask, copied from bootloader
	296	*/
babba4f1 DD	297
babba4f1 DD	298	mask = 1 << coreid;
773cb77d RB	299	/* LINUX_APP_BOOT_BLOCK is initialized in bootoct binary */
	300	block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
	301
	302	if (!block_desc) {
babba4f1	303	struct linux_app_boot_info *labi;
773cb77d	304
babba4f1	305	labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
773cb77d	306
babba4f1 DD	307	labi->avail_coremask \|= mask;
	308	new_mask = labi->avail_coremask;
	309	} else { /* alternative, already initialized */
	310	uint32_t p = (uint32_t )PHYS_TO_XKSEG_CACHED(block_desc->base_addr +
	311	AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
	312	*p \|= mask;
	313	new_mask = *p;
773cb77d RB	314	}
773cb77d RB	315
babba4f1 DD	316	pr_info("Reset core %d. Available Coremask = 0x%x \n", coreid, new_mask);
babba4f1 DD	317	mb();
773cb77d RB	318	cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
	319	cvmx_write_csr(CVMX_CIU_PP_RST, 0);
	320	}
	321
	322	void play_dead(void)
	323	{
babba4f1	324	int cpu = cpu_number_map(cvmx_get_core_num());
773cb77d RB	325
	326	idle_task_exit();
	327	octeon_processor_boot = 0xff;
babba4f1 DD	328	per_cpu(cpu_state, cpu) = CPU_DEAD;
	329
	330	mb();
773cb77d RB	331
	332	while (1) /* core will be reset here */
	333	;
	334	}
	335
	336	extern void kernel_entry(unsigned long arg1, ...);
	337
	338	static void start_after_reset(void)
	339	{
70342287	340	kernel_entry(0, 0, 0); /* set a2 = 0 for secondary core */
773cb77d RB	341	}
773cb77d RB	342
babba4f1	343	static int octeon_update_boot_vector(unsigned int cpu)
773cb77d RB	344	{
	345
	346	int coreid = cpu_logical_map(cpu);
babba4f1 DD	347	uint32_t avail_coremask;
babba4f1 DD	348	const struct cvmx_bootmem_named_block_desc *block_desc;
773cb77d	349	struct boot_init_vector *boot_vect =
babba4f1	350	(struct boot_init_vector *)PHYS_TO_XKSEG_CACHED(BOOTLOADER_BOOT_VECTOR);
773cb77d RB	351
	352	block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
	353
	354	if (!block_desc) {
babba4f1 DD	355	struct linux_app_boot_info *labi;
	356
	357	labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
	358
	359	avail_coremask = labi->avail_coremask;
	360	labi->avail_coremask &= ~(1 << coreid);
773cb77d	361	} else { /* alternative, already initialized */
babba4f1 DD	362	avail_coremask = (uint32_t )PHYS_TO_XKSEG_CACHED(
babba4f1 DD	363	block_desc->base_addr + AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
773cb77d RB	364	}
	365
	366	if (!(avail_coremask & (1 << coreid))) {
92a76f6d	367	/* core not available, assume, that caught by simple-executive */
773cb77d RB	368	cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
	369	cvmx_write_csr(CVMX_CIU_PP_RST, 0);
	370	}
	371
	372	boot_vect[coreid].app_start_func_addr =
	373	(uint32_t) (unsigned long) start_after_reset;
babba4f1	374	boot_vect[coreid].code_addr = octeon_bootloader_entry_addr;
773cb77d	375
babba4f1	376	mb();
773cb77d RB	377
	378	cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask);
	379
	380	return 0;
	381	}
	382
078a55fc	383	static int octeon_cpu_callback(struct notifier_block *nfb,
773cb77d RB	384	unsigned long action, void *hcpu)
	385	{
	386	unsigned int cpu = (unsigned long)hcpu;
	387
a8c5ddf0	388	switch (action & ~CPU_TASKS_FROZEN) {
773cb77d RB	389	case CPU_UP_PREPARE:
	390	octeon_update_boot_vector(cpu);
	391	break;
	392	case CPU_ONLINE:
	393	pr_info("Cpu %d online\n", cpu);
	394	break;
	395	case CPU_DEAD:
	396	break;
	397	}
	398
	399	return NOTIFY_OK;
	400	}
	401
078a55fc	402	static int register_cavium_notifier(void)
773cb77d	403	{
442f2012	404	hotcpu_notifier(octeon_cpu_callback, 0);
773cb77d RB	405	return 0;
773cb77d RB	406	}
773cb77d RB	407	late_initcall(register_cavium_notifier);
773cb77d RB	408
70342287	409	#endif /* CONFIG_HOTPLUG_CPU */
773cb77d	410
5b3b1688 DD	411	struct plat_smp_ops octeon_smp_ops = {
	412	.send_ipi_single = octeon_send_ipi_single,
	413	.send_ipi_mask = octeon_send_ipi_mask,
	414	.init_secondary = octeon_init_secondary,
	415	.smp_finish = octeon_smp_finish,
5b3b1688 DD	416	.boot_secondary = octeon_boot_secondary,
	417	.smp_setup = octeon_smp_setup,
	418	.prepare_cpus = octeon_prepare_cpus,
773cb77d RB	419	#ifdef CONFIG_HOTPLUG_CPU
	420	.cpu_disable = octeon_cpu_disable,
	421	.cpu_die = octeon_cpu_die,
	422	#endif
5b3b1688	423	};
c6d2b22e DD	424
	425	static irqreturn_t octeon_78xx_reched_interrupt(int irq, void *dev_id)
	426	{
	427	scheduler_ipi();
	428	return IRQ_HANDLED;
	429	}
	430
	431	static irqreturn_t octeon_78xx_call_function_interrupt(int irq, void *dev_id)
	432	{
	433	generic_smp_call_function_interrupt();
	434	return IRQ_HANDLED;
	435	}
	436
	437	static irqreturn_t octeon_78xx_icache_flush_interrupt(int irq, void *dev_id)
	438	{
	439	octeon_icache_flush();
	440	return IRQ_HANDLED;
	441	}
	442
	443	/*
	444	* Callout to firmware before smp_init
	445	*/
	446	static void octeon_78xx_prepare_cpus(unsigned int max_cpus)
	447	{
	448	if (request_irq(OCTEON_IRQ_MBOX0 + 0,
	449	octeon_78xx_reched_interrupt,
	450	IRQF_PERCPU \| IRQF_NO_THREAD, "Scheduler",
	451	octeon_78xx_reched_interrupt)) {
	452	panic("Cannot request_irq for SchedulerIPI");
	453	}
	454	if (request_irq(OCTEON_IRQ_MBOX0 + 1,
	455	octeon_78xx_call_function_interrupt,
	456	IRQF_PERCPU \| IRQF_NO_THREAD, "SMP-Call",
	457	octeon_78xx_call_function_interrupt)) {
	458	panic("Cannot request_irq for SMP-Call");
	459	}
	460	if (request_irq(OCTEON_IRQ_MBOX0 + 2,
	461	octeon_78xx_icache_flush_interrupt,
	462	IRQF_PERCPU \| IRQF_NO_THREAD, "ICache-Flush",
	463	octeon_78xx_icache_flush_interrupt)) {
	464	panic("Cannot request_irq for ICache-Flush");
	465	}
	466	}
	467
	468	static void octeon_78xx_send_ipi_single(int cpu, unsigned int action)
	469	{
	470	int i;
	471
	472	for (i = 0; i < 8; i++) {
	473	if (action & 1)
	474	octeon_ciu3_mbox_send(cpu, i);
	475	action >>= 1;
	476	}
	477	}
	478
	479	static void octeon_78xx_send_ipi_mask(const struct cpumask *mask,
	480	unsigned int action)
	481	{
	482	unsigned int cpu;
	483
	484	for_each_cpu(cpu, mask)
	485	octeon_78xx_send_ipi_single(cpu, action);
	486	}
	487
488	static struct plat_smp_ops octeon_78xx_smp_ops = {
489	.send_ipi_single = octeon_78xx_send_ipi_single,
490	.send_ipi_mask = octeon_78xx_send_ipi_mask,
491	.init_secondary = octeon_init_secondary,
492	.smp_finish = octeon_smp_finish,
493	.boot_secondary = octeon_boot_secondary,
494	.smp_setup = octeon_smp_setup,
495	.prepare_cpus = octeon_78xx_prepare_cpus,
496	#ifdef CONFIG_HOTPLUG_CPU
497	.cpu_disable = octeon_cpu_disable,
498	.cpu_die = octeon_cpu_die,
499	#endif
500	};
501
502	void __init octeon_setup_smp(void)
503	{
504	struct plat_smp_ops *ops;
505
506	if (octeon_has_feature(OCTEON_FEATURE_CIU3))
507	ops = &octeon_78xx_smp_ops;
508	else
509	ops = &octeon_smp_ops;
510
511	register_smp_ops(ops);
512	}