ia64/linux-2.6.18-xen.hg

annotate arch/mips/sgi-ip27/ip27-xtalk.c @ 0:831230e53067

Import 2.6.18 from kernel.org tarball.
author Ian Campbell <ian.campbell@xensource.com>
date Wed Apr 11 14:15:44 2007 +0100 (2007-04-11)
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rev   line source
ian@0 1 /*
ian@0 2 * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org)
ian@0 3 * Copyright (C) 1999, 2000 Silcon Graphics, Inc.
ian@0 4 * Copyright (C) 2004 Christoph Hellwig.
ian@0 5 * Released under GPL v2.
ian@0 6 *
ian@0 7 * Generic XTALK initialization code
ian@0 8 */
ian@0 9
ian@0 10 #include <linux/init.h>
ian@0 11 #include <linux/kernel.h>
ian@0 12 #include <asm/sn/types.h>
ian@0 13 #include <asm/sn/klconfig.h>
ian@0 14 #include <asm/sn/hub.h>
ian@0 15 #include <asm/pci/bridge.h>
ian@0 16 #include <asm/xtalk/xtalk.h>
ian@0 17
ian@0 18
ian@0 19 #define XBOW_WIDGET_PART_NUM 0x0
ian@0 20 #define XXBOW_WIDGET_PART_NUM 0xd000 /* Xbow in Xbridge */
ian@0 21 #define BASE_XBOW_PORT 8 /* Lowest external port */
ian@0 22
ian@0 23 extern int bridge_probe(nasid_t nasid, int widget, int masterwid);
ian@0 24
ian@0 25 static int __init probe_one_port(nasid_t nasid, int widget, int masterwid)
ian@0 26 {
ian@0 27 widgetreg_t widget_id;
ian@0 28 xwidget_part_num_t partnum;
ian@0 29
ian@0 30 widget_id = *(volatile widgetreg_t *)
ian@0 31 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID);
ian@0 32 partnum = XWIDGET_PART_NUM(widget_id);
ian@0 33
ian@0 34 printk(KERN_INFO "Cpu %d, Nasid 0x%x, widget 0x%x (partnum 0x%x) is ",
ian@0 35 smp_processor_id(), nasid, widget, partnum);
ian@0 36
ian@0 37 switch (partnum) {
ian@0 38 case BRIDGE_WIDGET_PART_NUM:
ian@0 39 case XBRIDGE_WIDGET_PART_NUM:
ian@0 40 bridge_probe(nasid, widget, masterwid);
ian@0 41 break;
ian@0 42 default:
ian@0 43 break;
ian@0 44 }
ian@0 45
ian@0 46 return 0;
ian@0 47 }
ian@0 48
ian@0 49 static int __init xbow_probe(nasid_t nasid)
ian@0 50 {
ian@0 51 lboard_t *brd;
ian@0 52 klxbow_t *xbow_p;
ian@0 53 unsigned masterwid, i;
ian@0 54
ian@0 55 printk("is xbow\n");
ian@0 56
ian@0 57 /*
ian@0 58 * found xbow, so may have multiple bridges
ian@0 59 * need to probe xbow
ian@0 60 */
ian@0 61 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8);
ian@0 62 if (!brd)
ian@0 63 return -ENODEV;
ian@0 64
ian@0 65 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
ian@0 66 if (!xbow_p)
ian@0 67 return -ENODEV;
ian@0 68
ian@0 69 /*
ian@0 70 * Okay, here's a xbow. Lets arbitrate and find
ian@0 71 * out if we should initialize it. Set enabled
ian@0 72 * hub connected at highest or lowest widget as
ian@0 73 * master.
ian@0 74 */
ian@0 75 #ifdef WIDGET_A
ian@0 76 i = HUB_WIDGET_ID_MAX + 1;
ian@0 77 do {
ian@0 78 i--;
ian@0 79 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
ian@0 80 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
ian@0 81 #else
ian@0 82 i = HUB_WIDGET_ID_MIN - 1;
ian@0 83 do {
ian@0 84 i++;
ian@0 85 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
ian@0 86 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
ian@0 87 #endif
ian@0 88
ian@0 89 masterwid = i;
ian@0 90 if (nasid != XBOW_PORT_NASID(xbow_p, i))
ian@0 91 return 1;
ian@0 92
ian@0 93 for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) {
ian@0 94 if (XBOW_PORT_IS_ENABLED(xbow_p, i) &&
ian@0 95 XBOW_PORT_TYPE_IO(xbow_p, i))
ian@0 96 probe_one_port(nasid, i, masterwid);
ian@0 97 }
ian@0 98
ian@0 99 return 0;
ian@0 100 }
ian@0 101
ian@0 102 void __init xtalk_probe_node(cnodeid_t nid)
ian@0 103 {
ian@0 104 volatile u64 hubreg;
ian@0 105 nasid_t nasid;
ian@0 106 xwidget_part_num_t partnum;
ian@0 107 widgetreg_t widget_id;
ian@0 108
ian@0 109 nasid = COMPACT_TO_NASID_NODEID(nid);
ian@0 110 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR);
ian@0 111
ian@0 112 /* check whether the link is up */
ian@0 113 if (!(hubreg & IIO_LLP_CSR_IS_UP))
ian@0 114 return;
ian@0 115
ian@0 116 widget_id = *(volatile widgetreg_t *)
ian@0 117 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID);
ian@0 118 partnum = XWIDGET_PART_NUM(widget_id);
ian@0 119
ian@0 120 printk(KERN_INFO "Cpu %d, Nasid 0x%x: partnum 0x%x is ",
ian@0 121 smp_processor_id(), nasid, partnum);
ian@0 122
ian@0 123 switch (partnum) {
ian@0 124 case BRIDGE_WIDGET_PART_NUM:
ian@0 125 bridge_probe(nasid, 0x8, 0xa);
ian@0 126 break;
ian@0 127 case XBOW_WIDGET_PART_NUM:
ian@0 128 case XXBOW_WIDGET_PART_NUM:
ian@0 129 xbow_probe(nasid);
ian@0 130 break;
ian@0 131 default:
ian@0 132 printk(" unknown widget??\n");
ian@0 133 break;
ian@0 134 }
ian@0 135 }