Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* sun4d_smp.c: Sparc SS1000/SC2000 SMP support.

 *

 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)

 *

 * Based on sun4m's smp.c, which is:

 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)

 */

#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/init.h>

#include <linux/spinlock.h>

#include <linux/mm.h>

#include <linux/swap.h>

#include <linux/profile.h>

#include <asm/ptrace.h>

#include <asm/atomic.h>

#include <asm/irq_regs.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/sbus.h>

#include <asm/sbi.h>

#include <asm/tlbflush.h>

#include <asm/cacheflush.h>

#include <asm/cpudata.h>

#include "irq.h"

#define IRQ_CROSS_CALL          15

extern ctxd_t *srmmu_ctx_table_phys;

extern void calibrate_delay(void);

static volatile int smp_processors_ready = 0;

static int smp_highest_cpu;

extern volatile unsigned long cpu_callin_map[NR_CPUS];

extern cpuinfo_sparc cpu_data[NR_CPUS];

extern unsigned char boot_cpu_id;

extern volatile int smp_process_available;

extern cpumask_t smp_commenced_mask;

extern int __smp4d_processor_id(void);

/* #define SMP_DEBUG */

#ifdef SMP_DEBUG

#define SMP_PRINTK(x)   printk x

#else

#define SMP_PRINTK(x)

#endif

static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)

{

        __asm__ __volatile__("swap [%1], %0\n\t" :

                             "=&r" (val), "=&r" (ptr) :

                             "0" (val), "1" (ptr));

        return val;

}

static void smp_setup_percpu_timer(void);

extern void cpu_probe(void);

extern void sun4d_distribute_irqs(void);

void __init smp4d_callin(void)

{

        int cpuid = hard_smp4d_processor_id();

        extern spinlock_t sun4d_imsk_lock;

        unsigned long flags;

        /* Show we are alive */

        cpu_leds[cpuid] = 0x6;

        show_leds(cpuid);

        /* Enable level15 interrupt, disable level14 interrupt for now */

        cc_set_imsk((cc_get_imsk() & ~0x8000) | 0x4000);

        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.

         */

        /* Get our local ticker going. */

        smp_setup_percpu_timer();

        calibrate_delay();

        smp_store_cpu_info(cpuid);

        local_flush_cache_all();

        local_flush_tlb_all();

        /* Allow master to continue. */

        swap((unsigned long *)&cpu_callin_map[cpuid], 1);

        local_flush_cache_all();

        local_flush_tlb_all();

        cpu_probe();

        while((unsigned long)current_set[cpuid] < PAGE_OFFSET)

                barrier();

        while(current_set[cpuid]->cpu != cpuid)

                barrier();

        /* Fix idle thread fields. */

        __asm__ __volatile__("ld [%0], %%g6\n\t"

                             : : "r" (&current_set[cpuid])

                             : "memory" /* paranoid */);

        cpu_leds[cpuid] = 0x9;

        show_leds(cpuid);

        /* Attach to the address space of init_task. */

        atomic_inc(&init_mm.mm_count);

        current->active_mm = &init_mm;

        local_flush_cache_all();

        local_flush_tlb_all();

        local_irq_enable();     /* We don't allow PIL 14 yet */

        while (!cpu_isset(cpuid, smp_commenced_mask))

                barrier();

        spin_lock_irqsave(&sun4d_imsk_lock, flags);

        cc_set_imsk(cc_get_imsk() & ~0x4000); /* Allow PIL 14 as well */

        spin_unlock_irqrestore(&sun4d_imsk_lock, flags);

        cpu_set(cpuid, cpu_online_map);

}

extern void init_IRQ(void);

extern void cpu_panic(void);

/*

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

 */

extern struct linux_prom_registers smp_penguin_ctable;

extern unsigned long trapbase_cpu1[];

extern unsigned long trapbase_cpu2[];

extern unsigned long trapbase_cpu3[];

void __init smp4d_boot_cpus(void)

{

        if (boot_cpu_id)

                current_set[0] = NULL;

        smp_setup_percpu_timer();

        local_flush_cache_all();

}

int __cpuinit smp4d_boot_one_cpu(int i)

{

                        extern unsigned long sun4d_cpu_startup;

                        unsigned long *entry = &sun4d_cpu_startup;

                        struct task_struct *p;

                        int timeout;

                        int cpu_node;

                        cpu_find_by_instance(i, &cpu_node,NULL);

                        /* Cook up an idler for this guy. */

                        p = fork_idle(i);

                        current_set[i] = task_thread_info(p);

                        /*

                         * 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... */

                        SMP_PRINTK(("Starting CPU %d at %p \n", i, entry));

                        local_flush_cache_all();

                        prom_startcpu(cpu_node,

                                      &smp_penguin_ctable, 0, (char *)entry);

                        SMP_PRINTK(("prom_startcpu returned :)\n"));

                        /* wheee... it's going... */

                        for(timeout = 0; timeout < 10000; timeout++) {

                                if(cpu_callin_map[i])

                                        break;

                                udelay(200);

                        }

        if (!(cpu_callin_map[i])) {

                printk("Processor %d is stuck.\n", i);

                return -ENODEV;

        }

        local_flush_cache_all();

        return 0;

}

void __init smp4d_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 */

        ClearPageReserved(virt_to_page(trapbase_cpu1));

        init_page_count(virt_to_page(trapbase_cpu1));

        free_page((unsigned long)trapbase_cpu1);

        totalram_pages++;

        num_physpages++;

        ClearPageReserved(virt_to_page(trapbase_cpu2));

        init_page_count(virt_to_page(trapbase_cpu2));

        free_page((unsigned long)trapbase_cpu2);

        totalram_pages++;

        num_physpages++;

        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;

        sun4d_distribute_irqs();

}

static struct smp_funcall {

        smpfunc_t func;

        unsigned long arg1;

        unsigned long arg2;

        unsigned long arg3;

        unsigned long arg4;

        unsigned long arg5;

        unsigned char processors_in[NR_CPUS];  /* Set when ipi entered. */

        unsigned char 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. */

void smp4d_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,

                    unsigned long arg3, unsigned long arg4, unsigned long arg5)

{

        if(smp_processors_ready) {

                register int high = smp_highest_cpu;

                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") = arg5;

                        __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. */

                {

                        cpumask_t mask;

                        register int i;

                        mask = cpumask_of_cpu(hard_smp4d_processor_id());

                        cpus_andnot(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;

                                        sun4d_send_ipi(i, IRQ_CROSS_CALL);

                                }

                        }

                }

                {

                        register int i;

                        i = 0;

                        do {

                                while(!ccall_info.processors_in[i])

                                        barrier();

                        } while(++i <= high);

                        i = 0;

                        do {

                                while(!ccall_info.processors_out[i])

                                        barrier();

                        } while(++i <= high);

                }

                spin_unlock_irqrestore(&cross_call_lock, flags);

        }

}

/* Running cross calls. */

void smp4d_cross_call_irq(void)

{

        int i = hard_smp4d_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 int smp4d_stop_cpu_sender;

static void smp4d_stop_cpu(void)

{

        int me = hard_smp4d_processor_id();

        if (me != smp4d_stop_cpu_sender)

                while(1) barrier();

}

/* Cross calls, in order to work efficiently and atomically do all

 * the message passing work themselves, only stopcpu and reschedule

 * messages come through here.

 */

void smp4d_message_pass(int target, int msg, unsigned long data, int wait)

{

        int me = hard_smp4d_processor_id();

        SMP_PRINTK(("smp4d_message_pass %d %d %08lx %d\n", target, msg, data, wait));

        if (msg == MSG_STOP_CPU && target == MSG_ALL_BUT_SELF) {

                unsigned long flags;

                static DEFINE_SPINLOCK(stop_cpu_lock);

                spin_lock_irqsave(&stop_cpu_lock, flags);

                smp4d_stop_cpu_sender = me;

                smp4d_cross_call((smpfunc_t)smp4d_stop_cpu, 0, 0, 0, 0, 0);

                spin_unlock_irqrestore(&stop_cpu_lock, flags);

        }

        printk("Yeeee, trying to send SMP msg(%d) to %d on cpu %d\n", msg, target, me);

        panic("Bogon SMP message pass.");

}

void smp4d_percpu_timer_interrupt(struct pt_regs *regs)

{

        struct pt_regs *old_regs;

        int cpu = hard_smp4d_processor_id();

        static int cpu_tick[NR_CPUS];

        static char led_mask[] = { 0xe, 0xd, 0xb, 0x7, 0xb, 0xd };

        old_regs = set_irq_regs(regs);

        bw_get_prof_limit(cpu);

        bw_clear_intr_mask(0, 1);        /* INTR_TABLE[0] & 1 is Profile IRQ */

        cpu_tick[cpu]++;

        if (!(cpu_tick[cpu] & 15)) {

                if (cpu_tick[cpu] == 0x60)

                        cpu_tick[cpu] = 0;

                cpu_leds[cpu] = led_mask[cpu_tick[cpu] >> 4];

                show_leds(cpu);

        }

        profile_tick(CPU_PROFILING);

        if(!--prof_counter(cpu)) {

                int user = user_mode(regs);

                irq_enter();

                update_process_times(user);

                irq_exit();

                prof_counter(cpu) = prof_multiplier(cpu);

        }

        set_irq_regs(old_regs);

}

extern unsigned int lvl14_resolution;

static void __init smp_setup_percpu_timer(void)

{

        int cpu = hard_smp4d_processor_id();

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

        load_profile_irq(cpu, lvl14_resolution);

}

void __init smp4d_blackbox_id(unsigned *addr)

{

        int rd = *addr & 0x3e000000;

        addr[0] = 0xc0800800 | rd;               /* lda [%g0] ASI_M_VIKING_TMP1, reg */

        addr[1] = 0x01000000;                   /* nop */

        addr[2] = 0x01000000;                   /* nop */

}

void __init smp4d_blackbox_current(unsigned *addr)

{

        int rd = *addr & 0x3e000000;

        addr[0] = 0xc0800800 | rd;               /* lda [%g0] ASI_M_VIKING_TMP1, reg */

        addr[2] = 0x81282002 | rd | (rd >> 11); /* sll reg, 2, reg */

        addr[4] = 0x01000000;                   /* nop */

}

void __init sun4d_init_smp(void)

{

        int i;

        extern unsigned int t_nmi[], linux_trap_ipi15_sun4d[], linux_trap_ipi15_sun4m[];

        /* Patch ipi15 trap table */

        t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_sun4d - linux_trap_ipi15_sun4m);

        /* And set btfixup... */

        BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4d_blackbox_id);

        BTFIXUPSET_BLACKBOX(load_current, smp4d_blackbox_current);

        BTFIXUPSET_CALL(smp_cross_call, smp4d_cross_call, BTFIXUPCALL_NORM);

        BTFIXUPSET_CALL(smp_message_pass, smp4d_message_pass, BTFIXUPCALL_NORM);

        BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4d_processor_id, BTFIXUPCALL_NORM);

        for (i = 0; i < NR_CPUS; i++) {

                ccall_info.processors_in[i] = 1;

                ccall_info.processors_out[i] = 1;

        }

}