1 files changed, 135 insertions, 0 deletions

diff --git a/kernel/arch/mips/sgi-ip27/ip27-xtalk.c b/kernel/arch/mips/sgi-ip27/ip27-xtalk.c
new file mode 100644
index 000000000..20f582a21
--- /dev/null
+++ b/kernel/arch/mips/sgi-ip27/ip27-xtalk.c
@@ -0,0 +1,135 @@
+/*
+ * 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. Lets 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;
+}
+
+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;
+	}
+}