summaryrefslogtreecommitdiffstats
path: root/arch/mips/sgi-ip27/ip27-xtalk.c
blob: ce06aaa115ae33c70538e608196ee956bec01ebd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/*
 * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org)
 * Copyright (C) 1999, 2000 Silcon Graphics, Inc.
 * Copyright (C) 2004 Christoph Hellwig.
 *	Released under GPL v2.
 *
 * Generic XTALK initialization code
 */

#include <linux/kernel.h>
#include <linux/smp.h>
#include <asm/sn/types.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/hub.h>
#include <asm/pci/bridge.h>
#include <asm/xtalk/xtalk.h>


#define XBOW_WIDGET_PART_NUM	0x0
#define XXBOW_WIDGET_PART_NUM	0xd000	/* Xbow in Xbridge */
#define BASE_XBOW_PORT		8     /* Lowest external port */

extern int bridge_probe(nasid_t nasid, int widget, int masterwid);

static int probe_one_port(nasid_t nasid, int widget, int masterwid)
{
	widgetreg_t		widget_id;
	xwidget_part_num_t	partnum;

	widget_id = *(volatile widgetreg_t *)
		(RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID);
	partnum = XWIDGET_PART_NUM(widget_id);

	printk(KERN_INFO "Cpu %d, Nasid 0x%x, widget 0x%x (partnum 0x%x) is ",
			smp_processor_id(), nasid, widget, partnum);

	switch (partnum) {
	case BRIDGE_WIDGET_PART_NUM:
	case XBRIDGE_WIDGET_PART_NUM:
		bridge_probe(nasid, widget, masterwid);
		break;
	default:
		break;
	}

	return 0;
}

static int xbow_probe(nasid_t nasid)
{
	lboard_t *brd;
	klxbow_t *xbow_p;
	unsigned masterwid, i;

	printk("is xbow\n");

	/*
	 * found xbow, so may have multiple bridges
	 * need to probe xbow
	 */
	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8);
	if (!brd)
		return -ENODEV;

	xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
	if (!xbow_p)
		return -ENODEV;

	/*
	 * Okay, here's a xbow. Let's arbitrate and find
	 * out if we should initialize it. Set enabled
	 * hub connected at highest or lowest widget as
	 * master.
	 */
#ifdef WIDGET_A
	i = HUB_WIDGET_ID_MAX + 1;
	do {
		i--;
	} while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
		 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
#else
	i = HUB_WIDGET_ID_MIN - 1;
	do {
		i++;
	} while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
		 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
#endif

	masterwid = i;
	if (nasid != XBOW_PORT_NASID(xbow_p, i))
		return 1;

	for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) {
		if (XBOW_PORT_IS_ENABLED(xbow_p, i) &&
		    XBOW_PORT_TYPE_IO(xbow_p, i))
			probe_one_port(nasid, i, masterwid);
	}

	return 0;
}

static void xtalk_probe_node(cnodeid_t nid)
{
	volatile u64		hubreg;
	nasid_t			nasid;
	xwidget_part_num_t	partnum;
	widgetreg_t		widget_id;

	nasid = COMPACT_TO_NASID_NODEID(nid);
	hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR);

	/* check whether the link is up */
	if (!(hubreg & IIO_LLP_CSR_IS_UP))
		return;

	widget_id = *(volatile widgetreg_t *)
		       (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID);
	partnum = XWIDGET_PART_NUM(widget_id);

	printk(KERN_INFO "Cpu %d, Nasid 0x%x: partnum 0x%x is ",
			smp_processor_id(), nasid, partnum);

	switch (partnum) {
	case BRIDGE_WIDGET_PART_NUM:
		bridge_probe(nasid, 0x8, 0xa);
		break;
	case XBOW_WIDGET_PART_NUM:
	case XXBOW_WIDGET_PART_NUM:
		xbow_probe(nasid);
		break;
	default:
		printk(" unknown widget??\n");
		break;
	}
}

static int __init xtalk_init(void)
{
	cnodeid_t cnode;

	for_each_online_node(cnode)
		xtalk_probe_node(cnode);

	return 0;
}
arch_initcall(xtalk_init);