[deliverable/linux.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.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 <asm/cacheflush.h>
#include <asm/tlbflush.h>

#include <asm/ptrace.h>
#include <asm/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 "kernel.h"

#ifdef CONFIG_SPARC_LEON

#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 __init 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;
}

static void smp_setup_percpu_timer(void);

void __cpuinit leon_callin(void)
{
	int cpuid = hard_smpleon_processor_id();

	local_flush_cache_all();
	local_flush_tlb_all();
	leon_configure_cache_smp();

	/* Get our local ticker going. */
	smp_setup_percpu_timer();

	calibrate_delay();
	smp_store_cpu_info(cpuid);

	local_flush_cache_all();
	local_flush_tlb_all();

	/*
	 * Unblock the master CPU _only_ when the scheduler state
	 * of all secondary CPUs will be up-to-date, so after
	 * the SMP initialization the master will be just allowed
	 * to call the scheduler code.
	 * Allow master to continue.
	 */
	do_swap(&cpu_callin_map[cpuid], 1);

	local_flush_cache_all();
	local_flush_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. */
	atomic_inc(&init_mm.mm_count);
	current->active_mm = &init_mm;

	while (!cpu_isset(cpuid, smp_commenced_mask))
		mb();

	local_irq_enable();
	cpu_set(cpuid, cpu_online_map);
}

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

extern struct linux_prom_registers smp_penguin_ctable;

void __init 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_flush_cache_all();
	local_flush_tlb_all();
}

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);
}

unsigned int leon_smp_getbroadcast(void)
{
	unsigned int mask;
	mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
	return 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();
	smp_setup_percpu_timer();
	local_flush_cache_all();

}

int __cpuinit leon_boot_one_cpu(int i)
{

	struct task_struct *p;
	int timeout;

	/* Cook up an idler for this guy. */
	p = fork_idle(i);

	current_set[i] = task_thread_info(p);

	/* 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_flush_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_flush_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_flush_cache_all();

	/* Free unneeded trap tables */
	if (!cpu_isset(1, cpu_present_map)) {
		ClearPageReserved(virt_to_page(&trapbase_cpu1));
		init_page_count(virt_to_page(&trapbase_cpu1));
		free_page((unsigned long)&trapbase_cpu1);
		totalram_pages++;
		num_physpages++;
	}
	if (!cpu_isset(2, cpu_present_map)) {
		ClearPageReserved(virt_to_page(&trapbase_cpu2));
		init_page_count(virt_to_page(&trapbase_cpu2));
		free_page((unsigned long)&trapbase_cpu2);
		totalram_pages++;
		num_physpages++;
	}
	if (!cpu_isset(3, cpu_present_map)) {
		ClearPageReserved(virt_to_page(&trapbase_cpu3));
		init_page_count(virt_to_page(&trapbase_cpu3));
		free_page((unsigned long)&trapbase_cpu3);
		totalram_pages++;
		num_physpages++;
	}
	/* Ok, they are spinning and ready to go. */
	smp_processors_ready = 1;

}

void leon_irq_rotate(int cpu)
{
}

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_flush_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_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 */
	set_cpu_int(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 */
	set_cpu_int(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) */
	set_cpu_int(cpu, leon_ipi_irq);
}

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

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;

			cpu_clear(smp_processor_id(), mask);
			cpus_and(mask, cpu_online_map, mask);
			for (i = 0; i <= high; i++) {
				if (cpu_isset(i, mask)) {
					ccall_info.processors_in[i] = 0;
					ccall_info.processors_out[i] = 0;
					set_cpu_int(i, LEON3_IRQ_CROSS_CALL);

				}
			}
		}

		{
			register int i;

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

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

			i = 0;
			do {
				if (!cpu_isset(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;
}

irqreturn_t leon_percpu_timer_interrupt(int irq, void *unused)
{
	int cpu = smp_processor_id();

	leon_clear_profile_irq(cpu);

	profile_tick(CPU_PROFILING);

	if (!--prof_counter(cpu)) {
		int user = user_mode(get_irq_regs());

		update_process_times(user);

		prof_counter(cpu) = prof_multiplier(cpu);
	}

	return IRQ_HANDLED;
}

static void __init smp_setup_percpu_timer(void)
{
	int cpu = smp_processor_id();

	prof_counter(cpu) = prof_multiplier(cpu) = 1;
}

void __init leon_blackbox_id(unsigned *addr)
{
	int rd = *addr & 0x3e000000;
	int rs1 = rd >> 11;

	/* patch places where ___b_hard_smp_processor_id appears */
	addr[0] = 0x81444000 | rd;	/* rd %asr17, reg */
	addr[1] = 0x8130201c | rd | rs1;	/* srl reg, 0x1c, reg */
	addr[2] = 0x01000000;	/* nop */
}

void __init leon_blackbox_current(unsigned *addr)
{
	int rd = *addr & 0x3e000000;
	int rs1 = rd >> 11;

	/* patch LOAD_CURRENT macro where ___b_load_current appears */
	addr[0] = 0x81444000 | rd;	/* rd %asr17, reg */
	addr[2] = 0x8130201c | rd | rs1;	/* srl reg, 0x1c, reg */
	addr[4] = 0x81282002 | rd | rs1;	/* sll reg, 0x2, reg */

}

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

	BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
	BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
	BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
			BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(smp_ipi_resched, leon_ipi_resched, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(smp_ipi_single, leon_ipi_single, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(smp_ipi_mask_one, leon_ipi_mask_one, BTFIXUPCALL_NORM);
}

#endif /* CONFIG_SPARC_LEON */
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>
	12	#include <linux/sched.h>
	13	#include <linux/threads.h>
	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>
8401707f KE	26
	27	#include <asm/cacheflush.h>
	28	#include <asm/tlbflush.h>
	29
	30	#include <asm/ptrace.h>
	31	#include <asm/atomic.h>
	32	#include <asm/irq_regs.h>
1ca0c808	33	#include <asm/traps.h>
8401707f KE	34
	35	#include <asm/delay.h>
	36	#include <asm/irq.h>
	37	#include <asm/page.h>
	38	#include <asm/pgalloc.h>
	39	#include <asm/pgtable.h>
	40	#include <asm/oplib.h>
	41	#include <asm/cpudata.h>
	42	#include <asm/asi.h>
	43	#include <asm/leon.h>
	44	#include <asm/leon_amba.h>
	45
a2a211cb SR	46	#include "kernel.h"
a2a211cb SR	47
8401707f KE	48	#ifdef CONFIG_SPARC_LEON
	49
	50	#include "irq.h"
	51
	52	extern ctxd_t *srmmu_ctx_table_phys;
	53	static int smp_processors_ready;
	54	extern volatile unsigned long cpu_callin_map[NR_CPUS];
8401707f KE	55	extern cpumask_t smp_commenced_mask;
8401707f KE	56	void __init leon_configure_cache_smp(void);
1ca0c808 DH	57	static void leon_ipi_init(void);
	58
	59	/* IRQ number of LEON IPIs */
	60	int leon_ipi_irq = LEON3_IRQ_IPI_DEFAULT;
8401707f KE	61
	62	static inline unsigned long do_swap(volatile unsigned long *ptr,
	63	unsigned long val)
	64	{
502279a7 DH	65	__asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
502279a7 DH	66	: "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
8401707f KE	67	: "memory");
	68	return val;
	69	}
	70
	71	static void smp_setup_percpu_timer(void);
	72
	73	void __cpuinit leon_callin(void)
	74	{
	75	int cpuid = hard_smpleon_processor_id();
	76
	77	local_flush_cache_all();
	78	local_flush_tlb_all();
	79	leon_configure_cache_smp();
	80
	81	/* Get our local ticker going. */
	82	smp_setup_percpu_timer();
	83
	84	calibrate_delay();
	85	smp_store_cpu_info(cpuid);
	86
	87	local_flush_cache_all();
	88	local_flush_tlb_all();
	89
	90	/*
	91	* Unblock the master CPU _only_ when the scheduler state
	92	* of all secondary CPUs will be up-to-date, so after
	93	* the SMP initialization the master will be just allowed
	94	* to call the scheduler code.
	95	* Allow master to continue.
	96	*/
	97	do_swap(&cpu_callin_map[cpuid], 1);
	98
	99	local_flush_cache_all();
	100	local_flush_tlb_all();
	101
8401707f KE	102	/* Fix idle thread fields. */
	103	__asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(&current_set[cpuid])
	104	: "memory" /* paranoid */);
	105
	106	/* Attach to the address space of init_task. */
	107	atomic_inc(&init_mm.mm_count);
	108	current->active_mm = &init_mm;
	109
	110	while (!cpu_isset(cpuid, smp_commenced_mask))
	111	mb();
	112
	113	local_irq_enable();
	114	cpu_set(cpuid, cpu_online_map);
	115	}
	116
	117	/*
	118	* Cycle through the processors asking the PROM to start each one.
	119	*/
	120
	121	extern struct linux_prom_registers smp_penguin_ctable;
	122
	123	void __init leon_configure_cache_smp(void)
	124	{
	125	unsigned long cfg = sparc_leon3_get_dcachecfg();
	126	int me = smp_processor_id();
	127
	128	if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
	129	printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
	130	(unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
	131	(unsigned int)cfg, (unsigned int)me);
	132	sparc_leon3_disable_cache();
	133	} else {
	134	if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
	135	sparc_leon3_enable_snooping();
	136	} else {
	137	printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
	138	me);
	139	sparc_leon3_disable_cache();
	140	}
	141	}
	142
	143	local_flush_cache_all();
	144	local_flush_tlb_all();
	145	}
	146
	147	void leon_smp_setbroadcast(unsigned int mask)
	148	{
	149	int broadcast =
	150	((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
	151	LEON3_IRQMPSTATUS_BROADCAST) & 1);
	152	if (!broadcast) {
	153	prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
	154	leon_smp_nrcpus());
	155	if (leon_smp_nrcpus() > 1) {
	156	BUG();
	157	} else {
	158	prom_printf("continue anyway\n");
	159	return;
	160	}
	161	}
	162	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
	163	}
	164
	165	unsigned int leon_smp_getbroadcast(void)
166	{
167	unsigned int mask;
168	mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
169	return mask;
170	}
171
172	int leon_smp_nrcpus(void)
173	{
174	int nrcpu =
175	((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
176	LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
177	return nrcpu;
178	}
179
180	void __init leon_boot_cpus(void)
181	{
182	int nrcpu = leon_smp_nrcpus();
183	int me = smp_processor_id();
184
1ca0c808 DH	185	/* Setup IPI */
	186	leon_ipi_init();
	187
0da2b300	188	printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
8401707f KE	189	(unsigned int)nrcpu, (unsigned int)NR_CPUS,
	190	(unsigned int)&(leon3_irqctrl_regs->mpstatus));
	191
	192	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
	193	leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
1ca0c808	194	leon_enable_irq_cpu(leon_ipi_irq, me);
8401707f KE	195
	196	leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
	197
	198	leon_configure_cache_smp();
	199	smp_setup_percpu_timer();
	200	local_flush_cache_all();
	201
	202	}
	203
	204	int __cpuinit leon_boot_one_cpu(int i)
	205	{
	206
	207	struct task_struct *p;
	208	int timeout;
	209
	210	/* Cook up an idler for this guy. */
	211	p = fork_idle(i);
	212
	213	current_set[i] = task_thread_info(p);
	214
	215	/* See trampoline.S:leon_smp_cpu_startup for details...
	216	* Initialize the contexts table
	217	* Since the call to prom_startcpu() trashes the structure,
	218	* we need to re-initialize it for each cpu
	219	*/
	220	smp_penguin_ctable.which_io = 0;
	221	smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
	222	smp_penguin_ctable.reg_size = 0;
	223
	224	/* whirrr, whirrr, whirrrrrrrrr... */
	225	printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
	226	(unsigned int)&leon3_irqctrl_regs->mpstatus);
	227	local_flush_cache_all();
	228
970def65 DH	229	/* Make sure all IRQs are of from the start for this new CPU */
	230	LEON_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[i], 0);
	231
	232	/* Wake one CPU */
8401707f KE	233	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
	234
	235	/* wheee... it's going... */
	236	for (timeout = 0; timeout < 10000; timeout++) {
	237	if (cpu_callin_map[i])
	238	break;
	239	udelay(200);
	240	}
0da2b300	241	printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
8401707f KE	242
	243	if (!(cpu_callin_map[i])) {
	244	printk(KERN_ERR "Processor %d is stuck.\n", i);
	245	return -ENODEV;
	246	} else {
	247	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
	248	leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
1ca0c808	249	leon_enable_irq_cpu(leon_ipi_irq, i);
8401707f KE	250	}
	251
	252	local_flush_cache_all();
	253	return 0;
	254	}
	255
	256	void __init leon_smp_done(void)
	257	{
	258
	259	int i, first;
	260	int *prev;
	261
	262	/* setup cpu list for irq rotation */
	263	first = 0;
	264	prev = &first;
	265	for (i = 0; i < NR_CPUS; i++) {
	266	if (cpu_online(i)) {
	267	*prev = i;
	268	prev = &cpu_data(i).next;
	269	}
	270	}
	271	*prev = first;
	272	local_flush_cache_all();
	273
	274	/* Free unneeded trap tables */
	275	if (!cpu_isset(1, cpu_present_map)) {
a2a211cb SR	276	ClearPageReserved(virt_to_page(&trapbase_cpu1));
	277	init_page_count(virt_to_page(&trapbase_cpu1));
	278	free_page((unsigned long)&trapbase_cpu1);
8401707f KE	279	totalram_pages++;
	280	num_physpages++;
	281	}
	282	if (!cpu_isset(2, cpu_present_map)) {
a2a211cb SR	283	ClearPageReserved(virt_to_page(&trapbase_cpu2));
	284	init_page_count(virt_to_page(&trapbase_cpu2));
	285	free_page((unsigned long)&trapbase_cpu2);
8401707f KE	286	totalram_pages++;
	287	num_physpages++;
	288	}
	289	if (!cpu_isset(3, cpu_present_map)) {
a2a211cb SR	290	ClearPageReserved(virt_to_page(&trapbase_cpu3));
	291	init_page_count(virt_to_page(&trapbase_cpu3));
	292	free_page((unsigned long)&trapbase_cpu3);
8401707f KE	293	totalram_pages++;
	294	num_physpages++;
	295	}
	296	/* Ok, they are spinning and ready to go. */
	297	smp_processors_ready = 1;
	298
	299	}
	300
	301	void leon_irq_rotate(int cpu)
	302	{
	303	}
	304
1ca0c808 DH	305	struct leon_ipi_work {
	306	int single;
	307	int msk;
	308	int resched;
	309	};
	310
	311	static DEFINE_PER_CPU_SHARED_ALIGNED(struct leon_ipi_work, leon_ipi_work);
	312
	313	/* Initialize IPIs on the LEON, in order to save IRQ resources only one IRQ
	314	* is used for all three types of IPIs.
	315	*/
	316	static void __init leon_ipi_init(void)
	317	{
	318	int cpu, len;
	319	struct leon_ipi_work *work;
	320	struct property *pp;
	321	struct device_node *rootnp;
	322	struct tt_entry *trap_table;
	323	unsigned long flags;
	324
	325	/* Find IPI IRQ or stick with default value */
	326	rootnp = of_find_node_by_path("/ambapp0");
	327	if (rootnp) {
	328	pp = of_find_property(rootnp, "ipi_num", &len);
	329	if (pp && ((int )pp->value))
	330	leon_ipi_irq = (int )pp->value;
	331	}
	332	printk(KERN_INFO "leon: SMP IPIs at IRQ %d\n", leon_ipi_irq);
	333
	334	/* Adjust so that we jump directly to smpleon_ipi */
	335	local_irq_save(flags);
	336	trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_ipi_irq - 1)];
	337	trap_table->inst_three += smpleon_ipi - real_irq_entry;
	338	local_flush_cache_all();
	339	local_irq_restore(flags);
	340
	341	for_each_possible_cpu(cpu) {
	342	work = &per_cpu(leon_ipi_work, cpu);
	343	work->single = work->msk = work->resched = 0;
	344	}
	345	}
	346
	347	static void leon_ipi_single(int cpu)
	348	{
	349	struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
	350
	351	/* Mark work */
	352	work->single = 1;
	353
	354	/* Generate IRQ on the CPU */
	355	set_cpu_int(cpu, leon_ipi_irq);
	356	}
	357
	358	static void leon_ipi_mask_one(int cpu)
	359	{
	360	struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
	361
	362	/* Mark work */
	363	work->msk = 1;
	364
	365	/* Generate IRQ on the CPU */
	366	set_cpu_int(cpu, leon_ipi_irq);
	367	}
	368
369	static void leon_ipi_resched(int cpu)
370	{
371	struct leon_ipi_work *work = &per_cpu(leon_ipi_work, cpu);
372
373	/* Mark work */
374	work->resched = 1;
375
376	/* Generate IRQ on the CPU (any IRQ will cause resched) */
377	set_cpu_int(cpu, leon_ipi_irq);
378	}
379
380	void leonsmp_ipi_interrupt(void)
381	{
382	struct leon_ipi_work *work = &__get_cpu_var(leon_ipi_work);
383
384	if (work->single) {
385	work->single = 0;
386	smp_call_function_single_interrupt();
387	}
388	if (work->msk) {
389	work->msk = 0;
390	smp_call_function_interrupt();
391	}
392	if (work->resched) {
393	work->resched = 0;
394	smp_resched_interrupt();
395	}
396	}
397
8401707f KE	398	static struct smp_funcall {
	399	smpfunc_t func;
	400	unsigned long arg1;
	401	unsigned long arg2;
	402	unsigned long arg3;
	403	unsigned long arg4;
	404	unsigned long arg5;
	405	unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */
	406	unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
	407	} ccall_info;
	408
	409	static DEFINE_SPINLOCK(cross_call_lock);
	410
	411	/* Cross calls must be serialized, at least currently. */
	412	static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
	413	unsigned long arg2, unsigned long arg3,
	414	unsigned long arg4)
	415	{
	416	if (smp_processors_ready) {
	417	register int high = NR_CPUS - 1;
	418	unsigned long flags;
	419
	420	spin_lock_irqsave(&cross_call_lock, flags);
	421
	422	{
	423	/* If you make changes here, make sure gcc generates proper code... */
	424	register smpfunc_t f asm("i0") = func;
	425	register unsigned long a1 asm("i1") = arg1;
	426	register unsigned long a2 asm("i2") = arg2;
	427	register unsigned long a3 asm("i3") = arg3;
	428	register unsigned long a4 asm("i4") = arg4;
	429	register unsigned long a5 asm("i5") = 0;
	430
	431	__asm__ __volatile__("std %0, [%6]\n\t"
	432	"std %2, [%6 + 8]\n\t"
	433	"std %4, [%6 + 16]\n\t" : :
	434	"r"(f), "r"(a1), "r"(a2), "r"(a3),
	435	"r"(a4), "r"(a5),
	436	"r"(&ccall_info.func));
	437	}
	438
	439	/* Init receive/complete mapping, plus fire the IPI's off. */
	440	{
	441	register int i;
	442
	443	cpu_clear(smp_processor_id(), mask);
	444	cpus_and(mask, cpu_online_map, mask);
	445	for (i = 0; i <= high; i++) {
	446	if (cpu_isset(i, mask)) {
	447	ccall_info.processors_in[i] = 0;
	448	ccall_info.processors_out[i] = 0;
	449	set_cpu_int(i, LEON3_IRQ_CROSS_CALL);
	450
	451	}
	452	}
	453	}
	454
	455	{
	456	register int i;
	457
	458	i = 0;
	459	do {
	460	if (!cpu_isset(i, mask))
	461	continue;
462
463	while (!ccall_info.processors_in[i])
464	barrier();
465	} while (++i <= high);
466
467	i = 0;
468	do {
469	if (!cpu_isset(i, mask))
470	continue;
471
472	while (!ccall_info.processors_out[i])
473	barrier();
474	} while (++i <= high);
475	}
476
477	spin_unlock_irqrestore(&cross_call_lock, flags);
478	}
479	}
480
481	/* Running cross calls. */
482	void leon_cross_call_irq(void)
483	{
484	int i = smp_processor_id();
485
486	ccall_info.processors_in[i] = 1;
487	ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
488	ccall_info.arg4, ccall_info.arg5);
489	ccall_info.processors_out[i] = 1;
490	}
491
2cf95304	492	irqreturn_t leon_percpu_timer_interrupt(int irq, void *unused)
8401707f	493	{
8401707f KE	494	int cpu = smp_processor_id();
8401707f KE	495
8401707f KE	496	leon_clear_profile_irq(cpu);
	497
	498	profile_tick(CPU_PROFILING);
	499
	500	if (!--prof_counter(cpu)) {
2cf95304	501	int user = user_mode(get_irq_regs());
8401707f	502
8401707f	503	update_process_times(user);
8401707f KE	504
	505	prof_counter(cpu) = prof_multiplier(cpu);
	506	}
2cf95304 DH	507
2cf95304 DH	508	return IRQ_HANDLED;
8401707f KE	509	}
	510
	511	static void __init smp_setup_percpu_timer(void)
	512	{
	513	int cpu = smp_processor_id();
	514
	515	prof_counter(cpu) = prof_multiplier(cpu) = 1;
	516	}
	517
	518	void __init leon_blackbox_id(unsigned *addr)
	519	{
	520	int rd = *addr & 0x3e000000;
	521	int rs1 = rd >> 11;
	522
	523	/* patch places where ___b_hard_smp_processor_id appears */
	524	addr[0] = 0x81444000 \| rd; /* rd %asr17, reg */
	525	addr[1] = 0x8130201c \| rd \| rs1; /* srl reg, 0x1c, reg */
	526	addr[2] = 0x01000000; /* nop */
	527	}
	528
	529	void __init leon_blackbox_current(unsigned *addr)
	530	{
	531	int rd = *addr & 0x3e000000;
	532	int rs1 = rd >> 11;
	533
	534	/* patch LOAD_CURRENT macro where ___b_load_current appears */
	535	addr[0] = 0x81444000 \| rd; /* rd %asr17, reg */
	536	addr[2] = 0x8130201c \| rd \| rs1; /* srl reg, 0x1c, reg */
	537	addr[4] = 0x81282002 \| rd \| rs1; /* sll reg, 0x2, reg */
	538
	539	}
	540
8401707f KE	541	void __init leon_init_smp(void)
	542	{
	543	/* Patch ipi15 trap table */
	544	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
	545
	546	BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
	547	BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
	548	BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
	549	BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
	550	BTFIXUPCALL_NORM);
1ca0c808 DH	551	BTFIXUPSET_CALL(smp_ipi_resched, leon_ipi_resched, BTFIXUPCALL_NORM);
	552	BTFIXUPSET_CALL(smp_ipi_single, leon_ipi_single, BTFIXUPCALL_NORM);
	553	BTFIXUPSET_CALL(smp_ipi_mask_one, leon_ipi_mask_one, BTFIXUPCALL_NORM);
8401707f KE	554	}
	555
	556	#endif /* CONFIG_SPARC_LEON */