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
  23 extern int bridge_probe(nasid_t nasid, int widget, int masterwid);
  24
  25 static 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
  49 static 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
 102 void __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 }