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
probe_one_port(nasid_t nasid,int widget,int masterwid)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
xbow_probe(nasid_t nasid)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
xtalk_probe_node(cnodeid_t nid)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 }
137