LXR linux/arch/mips/sgi-ip27/ip27-xtalk.c

   1/*
   2 * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org)
   3 * Copyright (C) 1999, 2000 Silcon Graphics, Inc.
   4 * Copyright (C) 2004 Christoph Hellwig.
   5 *      Released under GPL v2.
   6 *
   7 * Generic XTALK initialization code
   8 */
   9
  10#include <linux/init.h>
  11#include <linux/kernel.h>
  12#include <asm/sn/types.h>
  13#include <asm/sn/klconfig.h>
  14#include <asm/sn/hub.h>
  15#include <asm/pci/bridge.h>
  16#include <asm/xtalk/xtalk.h>
  17
  18
  19#define XBOW_WIDGET_PART_NUM    0x0
  20#define XXBOW_WIDGET_PART_NUM   0xd000  /* Xbow in Xbridge */
  21#define BASE_XBOW_PORT          8     /* Lowest external port */
  22
  23extern int bridge_probe(nasid_t nasid, int widget, int masterwid);
  24
  25static int __cpuinit probe_one_port(nasid_t nasid, int widget, int masterwid)
  26{
  27        widgetreg_t             widget_id;
  28        xwidget_part_num_t      partnum;
  29
  30        widget_id = *(volatile widgetreg_t *)
  31                (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID);
  32        partnum = XWIDGET_PART_NUM(widget_id);
  33
  34        printk(KERN_INFO "Cpu %d, Nasid 0x%x, widget 0x%x (partnum 0x%x) is ",
  35                        smp_processor_id(), nasid, widget, partnum);
  36
  37        switch (partnum) {
  38        case BRIDGE_WIDGET_PART_NUM:
  39        case XBRIDGE_WIDGET_PART_NUM:
  40                bridge_probe(nasid, widget, masterwid);
  41                break;
  42        default:
  43                break;
  44        }
  45
  46        return 0;
  47}
  48
  49static int __cpuinit xbow_probe(nasid_t nasid)
  50{
  51        lboard_t *brd;
  52        klxbow_t *xbow_p;
  53        unsigned masterwid, i;
  54
  55        printk("is xbow\n");
  56
  57        /*
  58         * found xbow, so may have multiple bridges
  59         * need to probe xbow
  60         */
  61        brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8);
  62        if (!brd)
  63                return -ENODEV;
  64
  65        xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
  66        if (!xbow_p)
  67                return -ENODEV;
  68
  69        /*
  70         * Okay, here's a xbow. Lets arbitrate and find
  71         * out if we should initialize it. Set enabled
  72         * hub connected at highest or lowest widget as
  73         * master.
  74         */
  75#ifdef WIDGET_A
  76        i = HUB_WIDGET_ID_MAX + 1;
  77        do {
  78                i--;
  79        } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
  80                 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
  81#else
  82        i = HUB_WIDGET_ID_MIN - 1;
  83        do {
  84                i++;
  85        } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
  86                 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
  87#endif
  88
  89        masterwid = i;
  90        if (nasid != XBOW_PORT_NASID(xbow_p, i))
  91                return 1;
  92
  93        for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) {
  94                if (XBOW_PORT_IS_ENABLED(xbow_p, i) &&
  95                    XBOW_PORT_TYPE_IO(xbow_p, i))
  96                        probe_one_port(nasid, i, masterwid);
  97        }
  98
  99        return 0;
 100}
 101
 102void __cpuinit xtalk_probe_node(cnodeid_t nid)
 103{
 104        volatile u64            hubreg;
 105        nasid_t                 nasid;
 106        xwidget_part_num_t      partnum;
 107        widgetreg_t             widget_id;
 108
 109        nasid = COMPACT_TO_NASID_NODEID(nid);
 110        hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR);
 111
 112        /* check whether the link is up */
 113        if (!(hubreg & IIO_LLP_CSR_IS_UP))
 114                return;
 115
 116        widget_id = *(volatile widgetreg_t *)
 117                       (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID);
 118        partnum = XWIDGET_PART_NUM(widget_id);
 119
 120        printk(KERN_INFO "Cpu %d, Nasid 0x%x: partnum 0x%x is ",
 121                        smp_processor_id(), nasid, partnum);
 122
 123        switch (partnum) {
 124        case BRIDGE_WIDGET_PART_NUM:
 125                bridge_probe(nasid, 0x8, 0xa);
 126                break;
 127        case XBOW_WIDGET_PART_NUM:
 128        case XXBOW_WIDGET_PART_NUM:
 129                xbow_probe(nasid);
 130                break;
 131        default:
 132                printk(" unknown widget??\n");
 133                break;
 134        }
 135}
 136