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ip27-xtalk.c

/*
 * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org)
 * 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 <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 __init 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 __init 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 __init 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;
      }
}

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