ip27-init.c

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/*
 * 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) 2000 - 2001 by Kanoj Sarcar ([email protected])
 * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/cpumask.h>
#include <asm/cpu.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/time.h>
#include <asm/sn/types.h>
#include <asm/sn/sn0/addrs.h>
#include <asm/sn/sn0/hubni.h>
#include <asm/sn/sn0/hubio.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/ioc3.h>
#include <asm/mipsregs.h>
#include <asm/sn/gda.h>
#include <asm/sn/hub.h>
#include <asm/sn/intr.h>
#include <asm/current.h>
#include <asm/processor.h>
#include <asm/mmu_context.h>
#include <asm/thread_info.h>
#include <asm/sn/launch.h>
#include <asm/sn/sn_private.h>
#include <asm/sn/sn0/ip27.h>
#include <asm/sn/mapped_kernel.h>

#define CPU_NONE        (cpuid_t)-1

static DECLARE_BITMAP(hub_init_mask, MAX_COMPACT_NODES);
nasid_t master_nasid = INVALID_NASID;

cnodeid_t   nasid_to_compact_node[MAX_NASIDS];
nasid_t     compact_to_nasid_node[MAX_COMPACT_NODES];
cnodeid_t   cpuid_to_compact_node[MAXCPUS];

EXPORT_SYMBOL(nasid_to_compact_node);

struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
EXPORT_SYMBOL_GPL(sn_cpu_info);

extern void pcibr_setup(cnodeid_t);

extern void xtalk_probe_node(cnodeid_t nid);

static void __cpuinit per_hub_init(cnodeid_t cnode)
{
    struct hub_data *hub = hub_data(cnode);
    nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
    int i;

    cpu_set(smp_processor_id(), hub->h_cpus);

    if (test_and_set_bit(cnode, hub_init_mask))
        return;
    /*
     * Set CRB timeout at 5ms, (< PI timeout of 10ms)
     */
    REMOTE_HUB_S(nasid, IIO_ICTP, 0x800);
    REMOTE_HUB_S(nasid, IIO_ICTO, 0xff);

    hub_rtc_init(cnode);
    xtalk_probe_node(cnode);

#ifdef CONFIG_REPLICATE_EXHANDLERS
    /*
     * If this is not a headless node initialization,
     * copy over the caliased exception handlers.
     */
    if (get_compact_nodeid() == cnode) {
        extern char except_vec2_generic, except_vec3_generic;
        extern void build_tlb_refill_handler(void);

        memcpy((void *)(CKSEG0 + 0x100), &except_vec2_generic, 0x80);
        memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x80);
        build_tlb_refill_handler();
        memcpy((void *)(CKSEG0 + 0x100), (void *) CKSEG0, 0x80);
        memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x100);
        __flush_cache_all();
    }
#endif

    /*
     * Some interrupts are reserved by hardware or by software convention.
     * Mark these as reserved right away so they won't be used accidentally
     * later.
     */
    for (i = 0; i <= BASE_PCI_IRQ; i++) {
        __set_bit(i, hub->irq_alloc_mask);
        LOCAL_HUB_CLR_INTR(INT_PEND0_BASELVL + i);
    }

    __set_bit(IP_PEND0_6_63, hub->irq_alloc_mask);
    LOCAL_HUB_S(PI_INT_PEND_MOD, IP_PEND0_6_63);

    for (i = NI_BRDCAST_ERR_A; i <= MSC_PANIC_INTR; i++) {
        __set_bit(i, hub->irq_alloc_mask);
        LOCAL_HUB_CLR_INTR(INT_PEND1_BASELVL + i);
    }
}

void __cpuinit per_cpu_init(void)
{
    int cpu = smp_processor_id();
    int slice = LOCAL_HUB_L(PI_CPU_NUM);
    cnodeid_t cnode = get_compact_nodeid();
    struct hub_data *hub = hub_data(cnode);
    struct slice_data *si = hub->slice + slice;
    int i;

    if (test_and_set_bit(slice, &hub->slice_map))
        return;

    clear_c0_status(ST0_IM);

    per_hub_init(cnode);

    for (i = 0; i < LEVELS_PER_SLICE; i++)
        si->level_to_irq[i] = -1;

    /*
     * We use this so we can find the local hub's data as fast as only
     * possible.
     */
    cpu_data[cpu].data = si;

    cpu_time_init();
    install_ipi();

    /* Install our NMI handler if symmon hasn't installed one. */
    install_cpu_nmi_handler(cputoslice(cpu));

    set_c0_status(SRB_DEV0 | SRB_DEV1);
}

/*
 * get_nasid() returns the physical node id number of the caller.
 */
nasid_t
get_nasid(void)
{
    return (nasid_t)((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_NODEID_MASK)
                     >> NSRI_NODEID_SHFT);
}

/*
 * Map the physical node id to a virtual node id (virtual node ids are contiguous).
 */
cnodeid_t get_compact_nodeid(void)
{
    return NASID_TO_COMPACT_NODEID(get_nasid());
}

static inline void ioc3_eth_init(void)
{
    struct ioc3 *ioc3;
    nasid_t nid;

    nid = get_nasid();
    ioc3 = (struct ioc3 *) KL_CONFIG_CH_CONS_INFO(nid)->memory_base;

    ioc3->eier = 0;
}

extern void ip27_reboot_setup(void);

void __init plat_mem_setup(void)
{
    hubreg_t p, e, n_mode;
    nasid_t nid;

    ip27_reboot_setup();

    /*
     * hub_rtc init and cpu clock intr enabled for later calibrate_delay.
     */
    nid = get_nasid();
    printk("IP27: Running on node %d.\n", nid);

    p = LOCAL_HUB_L(PI_CPU_PRESENT_A) & 1;
    e = LOCAL_HUB_L(PI_CPU_ENABLE_A) & 1;
    printk("Node %d has %s primary CPU%s.\n", nid,
           p ? "a" : "no",
           e ? ", CPU is running" : "");

    p = LOCAL_HUB_L(PI_CPU_PRESENT_B) & 1;
    e = LOCAL_HUB_L(PI_CPU_ENABLE_B) & 1;
    printk("Node %d has %s secondary CPU%s.\n", nid,
           p ? "a" : "no",
           e ? ", CPU is running" : "");

    /*
     * Try to catch kernel missconfigurations and give user an
     * indication what option to select.
     */
    n_mode = LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_MORENODES_MASK;
    printk("Machine is in %c mode.\n", n_mode ? 'N' : 'M');
#ifdef CONFIG_SGI_SN_N_MODE
    if (!n_mode)
        panic("Kernel compiled for M mode.");
#else
    if (n_mode)
        panic("Kernel compiled for N mode.");
#endif

    ioc3_eth_init();
    per_cpu_init();

    set_io_port_base(IO_BASE);
}