ia64/linux-2.6.18-xen.hg

view 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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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 */
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>
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 */
23 extern int bridge_probe(nasid_t nasid, int widget, int masterwid);
25 static int __init probe_one_port(nasid_t nasid, int widget, int masterwid)
26 {
27 widgetreg_t widget_id;
28 xwidget_part_num_t partnum;
30 widget_id = *(volatile widgetreg_t *)
31 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID);
32 partnum = XWIDGET_PART_NUM(widget_id);
34 printk(KERN_INFO "Cpu %d, Nasid 0x%x, widget 0x%x (partnum 0x%x) is ",
35 smp_processor_id(), nasid, widget, partnum);
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 }
46 return 0;
47 }
49 static int __init xbow_probe(nasid_t nasid)
50 {
51 lboard_t *brd;
52 klxbow_t *xbow_p;
53 unsigned masterwid, i;
55 printk("is xbow\n");
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;
65 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
66 if (!xbow_p)
67 return -ENODEV;
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
89 masterwid = i;
90 if (nasid != XBOW_PORT_NASID(xbow_p, i))
91 return 1;
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 }
99 return 0;
100 }
102 void __init 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;
109 nasid = COMPACT_TO_NASID_NODEID(nid);
110 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR);
112 /* check whether the link is up */
113 if (!(hubreg & IIO_LLP_CSR_IS_UP))
114 return;
116 widget_id = *(volatile widgetreg_t *)
117 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID);
118 partnum = XWIDGET_PART_NUM(widget_id);
120 printk(KERN_INFO "Cpu %d, Nasid 0x%x: partnum 0x%x is ",
121 smp_processor_id(), nasid, partnum);
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 }