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- /*
- * 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;
- }
- }
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