[mirror_ubuntu-artful-kernel.git] / arch / sparc / kernel / leon_smp.c

/* leon_smp.c: Sparc-Leon SMP support.
 *
 * based on sun4m_smp.c
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
 * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
 */

#include <asm/head.h>

#include <linux/kernel.h>
#include <linux/sched/mm.h>
#include <linux/threads.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/profile.h>
#include <linux/pm.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/cpu.h>
#include <linux/clockchips.h>

#include <asm/cacheflush.h>
#include <asm/tlbflush.h>

#include <asm/ptrace.h>
#include <linux/atomic.h>
#include <asm/irq_regs.h>
#include <asm/traps.h>

#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/cpudata.h>
#include <asm/asi.h>
#include <asm/leon.h>
#include <asm/leon_amba.h>
#include <asm/timer.h>

#include "kernel.h"

#include "irq.h"

extern ctxd_t *srmmu_ctx_table_phys;
static int smp_processors_ready;
extern volatile unsigned long cpu_callin_map[NR_CPUS];
extern cpumask_t smp_commenced_mask;
void leon_configure_cache_smp(void);
static void leon_ipi_init(void);

/* IRQ number of LEON IPIs */
int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT;

static inline unsigned long do_swap(volatile unsigned long *ptr,
				    unsigned long val)
{
	__asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
			     : "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
			     : "memory");
	return val;
}

void leon_cpu_pre_starting(void *arg)
{
	leon_configure_cache_smp();
}

void leon_cpu_pre_online(void *arg)
{
	int cpuid = hard_smp_processor_id();

	/* Allow master to continue. The master will then give us the
	 * go-ahead by setting the smp_commenced_mask and will wait without
	 * timeouts until our setup is completed fully (signified by
	 * our bit being set in the cpu_online_mask).
	 */
	do_swap(&cpu_callin_map[cpuid], 1);

	local_ops->cache_all();
	local_ops->tlb_all();

	/* Fix idle thread fields. */
	__asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(&current_set[cpuid])
			     : "memory" /* paranoid */);

	/* Attach to the address space of init_task. */
	mmgrab(&init_mm);
	current->active_mm = &init_mm;

	while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
		mb();
}

/*
 *	Cycle through the processors asking the PROM to start each one.
 */

extern struct linux_prom_registers smp_penguin_ctable;

void leon_configure_cache_smp(void)
{
	unsigned long cfg = sparc_leon3_get_dcachecfg();
	int me = smp_processor_id();

	if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
		printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
		     (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
		     (unsigned int)cfg, (unsigned int)me);
		sparc_leon3_disable_cache();
	} else {
		if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
			sparc_leon3_enable_snooping();
		} else {
			printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
			     me);
			sparc_leon3_disable_cache();
		}
	}

	local_ops->cache_all();
	local_ops->tlb_all();
}

static void leon_smp_setbroadcast(unsigned int mask)
{
	int broadcast =
	    ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
	      LEON3_IRQMPSTATUS_BROADCAST) & 1);
	if (!broadcast) {
		prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
		     leon_smp_nrcpus());
		if (leon_smp_nrcpus() > 1) {
			BUG();
		} else {
			prom_printf("continue anyway\n");
			return;
		}
	}
	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
}

int leon_smp_nrcpus(void)
{
	int nrcpu =
	    ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
	      LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
	return nrcpu;
}

void __init leon_boot_cpus(void)
{
	int nrcpu = leon_smp_nrcpus();
	int me = smp_processor_id();

	/* Setup IPI */
	leon_ipi_init();

	printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
	       (unsigned int)nrcpu, (unsigned int)NR_CPUS,
	       (unsigned int)&(leon3_irqctrl_regs->mpstatus));

	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
	leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
	leon_enable_irq_cpu(leon_ipi_irq, me);

	leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);

	leon_configure_cache_smp();
	local_ops->cache_all();

}

int leon_boot_one_cpu(int i, struct task_struct *idle)
{
	int timeout;

	current_set[i] = task_thread_info(idle);

	/* See trampoline.S:leon_smp_cpu_startup for details...
	 * Initialize the contexts table
	 * Since the call to prom_startcpu() trashes the structure,
	 * we need to re-initialize it for each cpu
	 */
	smp_penguin_ctable.which_io = 0;
	smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
	smp_penguin_ctable.reg_size = 0;

	/* whirrr, whirrr, whirrrrrrrrr... */
	printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
	       (unsigned int)&leon3_irqctrl_regs->mpstatus);
	local_ops->cache_all();

	/* Make sure all IRQs are of from the start for this new CPU */
	LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0);

	/* Wake one CPU */
	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);

	/* wheee... it's going... */
	for (timeout = 0; timeout < 10000; timeout++) {
		if (cpu_callin_map[i])
			break;
		udelay(200);
	}
	printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);

	if (!(cpu_callin_map[i])) {
		printk(KERN_ERR "Processor %d is stuck.\n", i);
		return -ENODEV;
	} else {
		leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
		leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
		leon_enable_irq_cpu(leon_ipi_irq, i);
	}

	local_ops->cache_all();
	return 0;
}

void __init leon_smp_done(void)
{

	int i, first;
	int *prev;

	/* setup cpu list for irq rotation */
	first = 0;
	prev = &first;
	for (i = 0; i < NR_CPUS; i++) {
		if (cpu_online(i)) {
			*prev = i;
			prev = &cpu_data(i).next;
		}
	}
	*prev = first;
	local_ops->cache_all();

	/* Free unneeded trap tables */
	if (!cpu_present(1)) {
		free_reserved_page(virt_to_page(&trapbase_cpu1));
	}
	if (!cpu_present(2)) {
		free_reserved_page(virt_to_page(&trapbase_cpu2));
	}
	if (!cpu_present(3)) {
		free_reserved_page(virt_to_page(&trapbase_cpu3));
	}
	/* Ok, they are spinning and ready to go. */
	smp_processors_ready = 1;

}

struct leon_ipi_work {
	int single;
	int msk;
	int resched;
};

static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work);

/* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ
 * is used for all three types of IPIs.
 */
static void __init leon_ipi_init(void)
{
	int cpu, len;
	struct leon_ipi_work *work;
	struct property *pp;
	struct device_node *rootnp;
	struct tt_entry *trap_table;
	unsigned long flags;

	/* Find IPI IRQ or stick with default value */
	rootnp = of_find_node_by_path("/ambapp0");
	if (rootnp) {
		pp = of_find_property(rootnp, "ipi_num", &len);
		if (pp && (*(int *)pp->value))
			leon_ipi_irq = *(int *)pp->value;
	}
	printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq);

	/* Adjust so that we jump directly to smpleon_ipi */
	local_irq_save(flags);
	trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)];
	trap_table->inst_three += smpleon_ipi - real_irq_entry;
	local_ops->cache_all();
	local_irq_restore(flags);

	for_each_possible_cpu(cpu) {
		work = &per_cpu(leon_ipi_work, cpu);
		work->single = work->msk = work->resched = 0;
	}
}

static void leon_send_ipi(int cpu, int level)
{
	unsigned long mask;
	mask = leon_get_irqmask(level);
	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
}

static void leon_ipi_single(int cpu)
{
	struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);

	/* Mark work */
	work->single = 1;

	/* Generate IRQ on the CPU */
	leon_send_ipi(cpu, leon_ipi_irq);
}

static void leon_ipi_mask_one(int cpu)
{
	struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);

	/* Mark work */
	work->msk = 1;

	/* Generate IRQ on the CPU */
	leon_send_ipi(cpu, leon_ipi_irq);
}

static void leon_ipi_resched(int cpu)
{
	struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);

	/* Mark work */
	work->resched = 1;

	/* Generate IRQ on the CPU (any IRQ will cause resched) */
	leon_send_ipi(cpu, leon_ipi_irq);
}

void leonsmp_ipi_interrupt(void)
{
	struct leon_ipi_work *work = this_cpu_ptr(&leon_ipi_work);

	if (work->single) {
		work->single = 0;
		smp_call_function_single_interrupt();
	}
	if (work->msk) {
		work->msk = 0;
		smp_call_function_interrupt();
	}
	if (work->resched) {
		work->resched = 0;
		smp_resched_interrupt();
	}
}

static struct smp_funcall {
	smpfunc_t func;
	unsigned long arg1;
	unsigned long arg2;
	unsigned long arg3;
	unsigned long arg4;
	unsigned long arg5;
	unsigned long processors_in[NR_CPUS];	/* Set when ipi entered. */
	unsigned long processors_out[NR_CPUS];	/* Set when ipi exited. */
} ccall_info __attribute__((aligned(8)));

static DEFINE_SPINLOCK(cross_call_lock);

/* Cross calls must be serialized, at least currently. */
static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
			    unsigned long arg2, unsigned long arg3,
			    unsigned long arg4)
{
	if (smp_processors_ready) {
		register int high = NR_CPUS - 1;
		unsigned long flags;

		spin_lock_irqsave(&cross_call_lock, flags);

		{
			/* If you make changes here, make sure gcc generates proper code... */
			register smpfunc_t f asm("i0") = func;
			register unsigned long a1 asm("i1") = arg1;
			register unsigned long a2 asm("i2") = arg2;
			register unsigned long a3 asm("i3") = arg3;
			register unsigned long a4 asm("i4") = arg4;
			register unsigned long a5 asm("i5") = 0;

			__asm__ __volatile__("std %0, [%6]\n\t"
					     "std %2, [%6 + 8]\n\t"
					     "std %4, [%6 + 16]\n\t" : :
					     "r"(f), "r"(a1), "r"(a2), "r"(a3),
					     "r"(a4), "r"(a5),
					     "r"(&ccall_info.func));
		}

		/* Init receive/complete mapping, plus fire the IPI's off. */
		{
			register int i;

			cpumask_clear_cpu(smp_processor_id(), &mask);
			cpumask_and(&mask, cpu_online_mask, &mask);
			for (i = 0; i <= high; i++) {
				if (cpumask_test_cpu(i, &mask)) {
					ccall_info.processors_in[i] = 0;
					ccall_info.processors_out[i] = 0;
					leon_send_ipi(i, LEON3_IRQ_CROSS_CALL);

				}
			}
		}

		{
			register int i;

			i = 0;
			do {
				if (!cpumask_test_cpu(i, &mask))
					continue;

				while (!ccall_info.processors_in[i])
					barrier();
			} while (++i <= high);

			i = 0;
			do {
				if (!cpumask_test_cpu(i, &mask))
					continue;

				while (!ccall_info.processors_out[i])
					barrier();
			} while (++i <= high);
		}

		spin_unlock_irqrestore(&cross_call_lock, flags);
	}
}

/* Running cross calls. */
void leon_cross_call_irq(void)
{
	int i = smp_processor_id();

	ccall_info.processors_in[i] = 1;
	ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
			ccall_info.arg4, ccall_info.arg5);
	ccall_info.processors_out[i] = 1;
}

static const struct sparc32_ipi_ops leon_ipi_ops = {
	.cross_call = leon_cross_call,
	.resched    = leon_ipi_resched,
	.single     = leon_ipi_single,
	.mask_one   = leon_ipi_mask_one,
};

void __init leon_init_smp(void)
{
	/* Patch ipi15 trap table */
	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);

	sparc32_ipi_ops = &leon_ipi_ops;
}
Commit	Line	Data
8401707f KE	1	/* leon_smp.c: Sparc-Leon SMP support.
	2	*
	3	* based on sun4m_smp.c
	4	* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
	5	* Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
	6	* Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
	7	*/
	8
	9	#include <asm/head.h>
	10
	11	#include <linux/kernel.h>
68e21be2	12	#include <linux/sched/mm.h>
8401707f KE	13	#include <linux/threads.h>
8401707f KE	14	#include <linux/smp.h>
8401707f KE	15	#include <linux/interrupt.h>
8401707f KE	16	#include <linux/kernel_stat.h>
1ca0c808	17	#include <linux/of.h>
8401707f KE	18	#include <linux/init.h>
	19	#include <linux/spinlock.h>
	20	#include <linux/mm.h>
	21	#include <linux/swap.h>
	22	#include <linux/profile.h>
	23	#include <linux/pm.h>
	24	#include <linux/delay.h>
5a0e3ad6	25	#include <linux/gfp.h>
62f08283 TK	26	#include <linux/cpu.h>
62f08283 TK	27	#include <linux/clockchips.h>
8401707f KE	28
	29	#include <asm/cacheflush.h>
	30	#include <asm/tlbflush.h>
	31
	32	#include <asm/ptrace.h>
60063497	33	#include <linux/atomic.h>
8401707f	34	#include <asm/irq_regs.h>
1ca0c808	35	#include <asm/traps.h>
8401707f KE	36
	37	#include <asm/delay.h>
	38	#include <asm/irq.h>
	39	#include <asm/page.h>
	40	#include <asm/pgalloc.h>
	41	#include <asm/pgtable.h>
	42	#include <asm/oplib.h>
	43	#include <asm/cpudata.h>
	44	#include <asm/asi.h>
	45	#include <asm/leon.h>
	46	#include <asm/leon_amba.h>
62f08283	47	#include <asm/timer.h>
8401707f	48
a2a211cb SR	49	#include "kernel.h"
a2a211cb SR	50
8401707f KE	51	#include "irq.h"
	52
	53	extern ctxd_t *srmmu_ctx_table_phys;
	54	static int smp_processors_ready;
	55	extern volatile unsigned long cpu_callin_map[NR_CPUS];
8401707f	56	extern cpumask_t smp_commenced_mask;
2066aadd	57	void leon_configure_cache_smp(void);
1ca0c808 DH	58	static void leon_ipi_init(void);
	59
	60	/* IRQ number of LEON IPIs */
	61	int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT;
8401707f KE	62
	63	static inline unsigned long do_swap(volatile unsigned long *ptr,
	64	unsigned long val)
	65	{
502279a7 DH	66	__asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
502279a7 DH	67	: "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
8401707f KE	68	: "memory");
	69	return val;
	70	}
	71
2066aadd	72	void leon_cpu_pre_starting(void *arg)
8401707f	73	{
8401707f	74	leon_configure_cache_smp();
f9fd3488	75	}
8401707f	76
2066aadd	77	void leon_cpu_pre_online(void *arg)
f9fd3488 SR	78	{
f9fd3488 SR	79	int cpuid = hard_smp_processor_id();
8401707f	80
f9fd3488 SR	81	/* Allow master to continue. The master will then give us the
	82	* go-ahead by setting the smp_commenced_mask and will wait without
	83	* timeouts until our setup is completed fully (signified by
	84	* our bit being set in the cpu_online_mask).
8401707f KE	85	*/
	86	do_swap(&cpu_callin_map[cpuid], 1);
	87
5d83d666 DM	88	local_ops->cache_all();
5d83d666 DM	89	local_ops->tlb_all();
8401707f	90
8401707f KE	91	/* Fix idle thread fields. */
	92	__asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(&current_set[cpuid])
	93	: "memory" /* paranoid */);
	94
	95	/* Attach to the address space of init_task. */
f1f10076	96	mmgrab(&init_mm);
8401707f KE	97	current->active_mm = &init_mm;
8401707f KE	98
fb1fece5	99	while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
8401707f	100	mb();
8401707f KE	101	}
	102
	103	/*
	104	* Cycle through the processors asking the PROM to start each one.
	105	*/
	106
	107	extern struct linux_prom_registers smp_penguin_ctable;
	108
2066aadd	109	void leon_configure_cache_smp(void)
8401707f KE	110	{
	111	unsigned long cfg = sparc_leon3_get_dcachecfg();
	112	int me = smp_processor_id();
	113
	114	if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
	115	printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
	116	(unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
	117	(unsigned int)cfg, (unsigned int)me);
	118	sparc_leon3_disable_cache();
	119	} else {
	120	if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
	121	sparc_leon3_enable_snooping();
	122	} else {
	123	printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
	124	me);
	125	sparc_leon3_disable_cache();
	126	}
	127	}
	128
5d83d666 DM	129	local_ops->cache_all();
5d83d666 DM	130	local_ops->tlb_all();
8401707f KE	131	}
8401707f KE	132
1bbc9060	133	static void leon_smp_setbroadcast(unsigned int mask)
8401707f KE	134	{
	135	int broadcast =
	136	((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
	137	LEON3_IRQMPSTATUS_BROADCAST) & 1);
	138	if (!broadcast) {
	139	prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
	140	leon_smp_nrcpus());
	141	if (leon_smp_nrcpus() > 1) {
	142	BUG();
	143	} else {
	144	prom_printf("continue anyway\n");
	145	return;
	146	}
	147	}
	148	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
	149	}
	150
8401707f KE	151	int leon_smp_nrcpus(void)
	152	{
	153	int nrcpu =
	154	((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
	155	LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
	156	return nrcpu;
	157	}
	158
	159	void __init leon_boot_cpus(void)
	160	{
	161	int nrcpu = leon_smp_nrcpus();
	162	int me = smp_processor_id();
	163
1ca0c808 DH	164	/* Setup IPI */
	165	leon_ipi_init();
	166
0da2b300	167	printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
8401707f KE	168	(unsigned int)nrcpu, (unsigned int)NR_CPUS,
	169	(unsigned int)&(leon3_irqctrl_regs->mpstatus));
	170
	171	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
	172	leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
1ca0c808	173	leon_enable_irq_cpu(leon_ipi_irq, me);
8401707f KE	174
	175	leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
	176
	177	leon_configure_cache_smp();
5d83d666	178	local_ops->cache_all();
8401707f KE	179
	180	}
	181
2066aadd	182	int leon_boot_one_cpu(int i, struct task_struct *idle)
8401707f	183	{
8401707f KE	184	int timeout;
8401707f KE	185
f0a2bc7e	186	current_set[i] = task_thread_info(idle);
8401707f KE	187
	188	/* See trampoline.S:leon_smp_cpu_startup for details...
	189	* Initialize the contexts table
	190	* Since the call to prom_startcpu() trashes the structure,
	191	* we need to re-initialize it for each cpu
	192	*/
	193	smp_penguin_ctable.which_io = 0;
	194	smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
	195	smp_penguin_ctable.reg_size = 0;
	196
	197	/* whirrr, whirrr, whirrrrrrrrr... */
	198	printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
	199	(unsigned int)&leon3_irqctrl_regs->mpstatus);
5d83d666	200	local_ops->cache_all();
8401707f	201
970def65 DH	202	/* Make sure all IRQs are of from the start for this new CPU */
	203	LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0);
	204
	205	/* Wake one CPU */
8401707f KE	206	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
	207
	208	/* wheee... it's going... */
	209	for (timeout = 0; timeout < 10000; timeout++) {
	210	if (cpu_callin_map[i])
	211	break;
	212	udelay(200);
	213	}
0da2b300	214	printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
8401707f KE	215
	216	if (!(cpu_callin_map[i])) {
	217	printk(KERN_ERR "Processor %d is stuck.\n", i);
	218	return -ENODEV;
	219	} else {
	220	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
	221	leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
1ca0c808	222	leon_enable_irq_cpu(leon_ipi_irq, i);
8401707f KE	223	}
8401707f KE	224
5d83d666	225	local_ops->cache_all();
8401707f KE	226	return 0;
	227	}
	228
	229	void __init leon_smp_done(void)
	230	{
	231
	232	int i, first;
	233	int *prev;
	234
	235	/* setup cpu list for irq rotation */
	236	first = 0;
	237	prev = &first;
	238	for (i = 0; i < NR_CPUS; i++) {
	239	if (cpu_online(i)) {
	240	*prev = i;
	241	prev = &cpu_data(i).next;
	242	}
	243	}
	244	*prev = first;
5d83d666	245	local_ops->cache_all();
8401707f KE	246
8401707f KE	247	/* Free unneeded trap tables */
fb1fece5	248	if (!cpu_present(1)) {
70affe45	249	free_reserved_page(virt_to_page(&trapbase_cpu1));
8401707f	250	}
fb1fece5	251	if (!cpu_present(2)) {
70affe45	252	free_reserved_page(virt_to_page(&trapbase_cpu2));
8401707f	253	}
fb1fece5	254	if (!cpu_present(3)) {
70affe45	255	free_reserved_page(virt_to_page(&trapbase_cpu3));
8401707f KE	256	}
	257	/* Ok, they are spinning and ready to go. */
	258	smp_processors_ready = 1;
	259
	260	}
	261
1ca0c808 DH	262	struct leon_ipi_work {
	263	int single;
	264	int msk;
	265	int resched;
	266	};
	267
	268	static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work);
	269
	270	/* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ
	271	* is used for all three types of IPIs.
	272	*/
	273	static void __init leon_ipi_init(void)
	274	{
	275	int cpu, len;
	276	struct leon_ipi_work *work;
	277	struct property *pp;
	278	struct device_node *rootnp;
	279	struct tt_entry *trap_table;
	280	unsigned long flags;
	281
	282	/* Find IPI IRQ or stick with default value */
	283	rootnp = of_find_node_by_path("/ambapp0");
	284	if (rootnp) {
	285	pp = of_find_property(rootnp, "ipi_num", &len);
	286	if (pp && ((int )pp->value))
	287	leon_ipi_irq = (int )pp->value;
	288	}
	289	printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq);
	290
	291	/* Adjust so that we jump directly to smpleon_ipi */
	292	local_irq_save(flags);
	293	trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)];
	294	trap_table->inst_three += smpleon_ipi - real_irq_entry;
5d83d666	295	local_ops->cache_all();
1ca0c808 DH	296	local_irq_restore(flags);
	297
	298	for_each_possible_cpu(cpu) {
	299	work = &per_cpu(leon_ipi_work, cpu);
	300	work->single = work->msk = work->resched = 0;
	301	}
	302	}
	303
4ba22b16 SR	304	static void leon_send_ipi(int cpu, int level)
	305	{
	306	unsigned long mask;
	307	mask = leon_get_irqmask(level);
	308	LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
	309	}
	310
1ca0c808 DH	311	static void leon_ipi_single(int cpu)
	312	{
	313	struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
	314
	315	/* Mark work */
	316	work->single = 1;
	317
	318	/* Generate IRQ on the CPU */
4ba22b16	319	leon_send_ipi(cpu, leon_ipi_irq);
1ca0c808 DH	320	}
	321
	322	static void leon_ipi_mask_one(int cpu)
	323	{
	324	struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
	325
	326	/* Mark work */
	327	work->msk = 1;
	328
	329	/* Generate IRQ on the CPU */
4ba22b16	330	leon_send_ipi(cpu, leon_ipi_irq);
1ca0c808 DH	331	}
	332
	333	static void leon_ipi_resched(int cpu)
	334	{
	335	struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
	336
	337	/* Mark work */
	338	work->resched = 1;
	339
	340	/* Generate IRQ on the CPU (any IRQ will cause resched) */
4ba22b16	341	leon_send_ipi(cpu, leon_ipi_irq);
1ca0c808 DH	342	}
	343
	344	void leonsmp_ipi_interrupt(void)
	345	{
494fc421	346	struct leon_ipi_work *work = this_cpu_ptr(&leon_ipi_work);
1ca0c808 DH	347
	348	if (work->single) {
	349	work->single = 0;
	350	smp_call_function_single_interrupt();
	351	}
	352	if (work->msk) {
	353	work->msk = 0;
	354	smp_call_function_interrupt();
	355	}
	356	if (work->resched) {
	357	work->resched = 0;
	358	smp_resched_interrupt();
	359	}
	360	}
	361
8401707f KE	362	static struct smp_funcall {
	363	smpfunc_t func;
	364	unsigned long arg1;
	365	unsigned long arg2;
	366	unsigned long arg3;
	367	unsigned long arg4;
	368	unsigned long arg5;
	369	unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */
	370	unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
92f268ee	371	} ccall_info __attribute__((aligned(8)));
8401707f KE	372
	373	static DEFINE_SPINLOCK(cross_call_lock);
	374
	375	/* Cross calls must be serialized, at least currently. */
	376	static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
	377	unsigned long arg2, unsigned long arg3,
	378	unsigned long arg4)
	379	{
	380	if (smp_processors_ready) {
	381	register int high = NR_CPUS - 1;
	382	unsigned long flags;
	383
	384	spin_lock_irqsave(&cross_call_lock, flags);
	385
	386	{
	387	/* If you make changes here, make sure gcc generates proper code... */
	388	register smpfunc_t f asm("i0") = func;
	389	register unsigned long a1 asm("i1") = arg1;
	390	register unsigned long a2 asm("i2") = arg2;
	391	register unsigned long a3 asm("i3") = arg3;
	392	register unsigned long a4 asm("i4") = arg4;
	393	register unsigned long a5 asm("i5") = 0;
	394
	395	__asm__ __volatile__("std %0, [%6]\n\t"
	396	"std %2, [%6 + 8]\n\t"
	397	"std %4, [%6 + 16]\n\t" : :
	398	"r"(f), "r"(a1), "r"(a2), "r"(a3),
	399	"r"(a4), "r"(a5),
	400	"r"(&ccall_info.func));
	401	}
	402
	403	/* Init receive/complete mapping, plus fire the IPI's off. */
	404	{
	405	register int i;
	406
fb1fece5 KM	407	cpumask_clear_cpu(smp_processor_id(), &mask);
fb1fece5 KM	408	cpumask_and(&mask, cpu_online_mask, &mask);
8401707f	409	for (i = 0; i <= high; i++) {
fb1fece5	410	if (cpumask_test_cpu(i, &mask)) {
8401707f KE	411	ccall_info.processors_in[i] = 0;
8401707f KE	412	ccall_info.processors_out[i] = 0;
4ba22b16	413	leon_send_ipi(i, LEON3_IRQ_CROSS_CALL);
8401707f KE	414
	415	}
	416	}
	417	}
	418
	419	{
	420	register int i;
	421
	422	i = 0;
	423	do {
fb1fece5	424	if (!cpumask_test_cpu(i, &mask))
8401707f KE	425	continue;
	426
	427	while (!ccall_info.processors_in[i])
	428	barrier();
	429	} while (++i <= high);
	430
	431	i = 0;
	432	do {
fb1fece5	433	if (!cpumask_test_cpu(i, &mask))
8401707f KE	434	continue;
	435
	436	while (!ccall_info.processors_out[i])
	437	barrier();
	438	} while (++i <= high);
	439	}
	440
	441	spin_unlock_irqrestore(&cross_call_lock, flags);
	442	}
	443	}
	444
	445	/* Running cross calls. */
	446	void leon_cross_call_irq(void)
	447	{
	448	int i = smp_processor_id();
	449
	450	ccall_info.processors_in[i] = 1;
	451	ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
	452	ccall_info.arg4, ccall_info.arg5);
	453	ccall_info.processors_out[i] = 1;
	454	}
	455
4ba22b16 SR	456	static const struct sparc32_ipi_ops leon_ipi_ops = {
	457	.cross_call = leon_cross_call,
	458	.resched = leon_ipi_resched,
	459	.single = leon_ipi_single,
	460	.mask_one = leon_ipi_mask_one,
	461	};
	462
8401707f KE	463	void __init leon_init_smp(void)
	464	{
	465	/* Patch ipi15 trap table */
	466	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
	467
4ba22b16	468	sparc32_ipi_ops = &leon_ipi_ops;
8401707f	469	}