ip27-xtalk.c

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/*
 * Copyright (C) 1999, 2000 Ralf Baechle ([email protected])
 * Copyright (C) 1999, 2000 Silcon Graphics, Inc.
 * Copyright (C) 2004 Christoph Hellwig.
 *  Released under GPL v2.
 *
 * Generic XTALK initialization code
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <asm/sn/types.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/hub.h>
#include <asm/pci/bridge.h>
#include <asm/xtalk/xtalk.h>


#define XBOW_WIDGET_PART_NUM    0x0
#define XXBOW_WIDGET_PART_NUM   0xd000  /* Xbow in Xbridge */
#define BASE_XBOW_PORT      8     /* Lowest external port */

extern int bridge_probe(nasid_t nasid, int widget, int masterwid);

static int __cpuinit probe_one_port(nasid_t nasid, int widget, int masterwid)
{
    widgetreg_t         widget_id;
    xwidget_part_num_t  partnum;

    widget_id = *(volatile widgetreg_t *)
        (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID);
    partnum = XWIDGET_PART_NUM(widget_id);

    printk(KERN_INFO "Cpu %d, Nasid 0x%x, widget 0x%x (partnum 0x%x) is ",
            smp_processor_id(), nasid, widget, partnum);

    switch (partnum) {
    case BRIDGE_WIDGET_PART_NUM:
    case XBRIDGE_WIDGET_PART_NUM:
        bridge_probe(nasid, widget, masterwid);
        break;
    default:
        break;
    }

    return 0;
}

static int __cpuinit xbow_probe(nasid_t nasid)
{
    lboard_t *brd;
    klxbow_t *xbow_p;
    unsigned masterwid, i;

    printk("is xbow\n");

    /*
     * found xbow, so may have multiple bridges
     * need to probe xbow
     */
    brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8);
    if (!brd)
        return -ENODEV;

    xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
    if (!xbow_p)
        return -ENODEV;

    /*
     * Okay, here's a xbow. Lets arbitrate and find
     * out if we should initialize it. Set enabled
     * hub connected at highest or lowest widget as
     * master.
     */
#ifdef WIDGET_A
    i = HUB_WIDGET_ID_MAX + 1;
    do {
        i--;
    } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
         (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
#else
    i = HUB_WIDGET_ID_MIN - 1;
    do {
        i++;
    } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
         (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
#endif

    masterwid = i;
    if (nasid != XBOW_PORT_NASID(xbow_p, i))
        return 1;

    for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) {
        if (XBOW_PORT_IS_ENABLED(xbow_p, i) &&
            XBOW_PORT_TYPE_IO(xbow_p, i))
            probe_one_port(nasid, i, masterwid);
    }

    return 0;
}

void __cpuinit xtalk_probe_node(cnodeid_t nid)
{
    volatile u64        hubreg;
    nasid_t         nasid;
    xwidget_part_num_t  partnum;
    widgetreg_t         widget_id;

    nasid = COMPACT_TO_NASID_NODEID(nid);
    hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR);

    /* check whether the link is up */
    if (!(hubreg & IIO_LLP_CSR_IS_UP))
        return;

    widget_id = *(volatile widgetreg_t *)
                       (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID);
    partnum = XWIDGET_PART_NUM(widget_id);

    printk(KERN_INFO "Cpu %d, Nasid 0x%x: partnum 0x%x is ",
            smp_processor_id(), nasid, partnum);

    switch (partnum) {
    case BRIDGE_WIDGET_PART_NUM:
        bridge_probe(nasid, 0x8, 0xa);
        break;
    case XBOW_WIDGET_PART_NUM:
    case XXBOW_WIDGET_PART_NUM:
        xbow_probe(nasid);
        break;
    default:
        printk(" unknown widget??\n");
        break;
    }
}