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