4939788eb8
As noticed by Sergei in the discussion of Andrea Gelmini's patch series. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Reported-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
/*
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* Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org)
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* Copyright (C) 1999, 2000 Silcon Graphics, Inc.
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* Copyright (C) 2004 Christoph Hellwig.
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* Released under GPL v2.
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*
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* Generic XTALK initialization code
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*/
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#include <linux/kernel.h>
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#include <linux/smp.h>
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#include <asm/sn/types.h>
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#include <asm/sn/klconfig.h>
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#include <asm/sn/hub.h>
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#include <asm/pci/bridge.h>
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#include <asm/xtalk/xtalk.h>
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#define XBOW_WIDGET_PART_NUM 0x0
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#define XXBOW_WIDGET_PART_NUM 0xd000 /* Xbow in Xbridge */
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#define BASE_XBOW_PORT 8 /* Lowest external port */
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extern int bridge_probe(nasid_t nasid, int widget, int masterwid);
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static int probe_one_port(nasid_t nasid, int widget, int masterwid)
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{
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widgetreg_t widget_id;
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xwidget_part_num_t partnum;
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widget_id = *(volatile widgetreg_t *)
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(RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID);
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partnum = XWIDGET_PART_NUM(widget_id);
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printk(KERN_INFO "Cpu %d, Nasid 0x%x, widget 0x%x (partnum 0x%x) is ",
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smp_processor_id(), nasid, widget, partnum);
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switch (partnum) {
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case BRIDGE_WIDGET_PART_NUM:
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case XBRIDGE_WIDGET_PART_NUM:
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bridge_probe(nasid, widget, masterwid);
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break;
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default:
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break;
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}
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return 0;
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}
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static int xbow_probe(nasid_t nasid)
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{
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lboard_t *brd;
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klxbow_t *xbow_p;
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unsigned masterwid, i;
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printk("is xbow\n");
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/*
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* found xbow, so may have multiple bridges
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* need to probe xbow
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*/
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brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8);
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if (!brd)
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return -ENODEV;
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xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
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if (!xbow_p)
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return -ENODEV;
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/*
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* Okay, here's a xbow. Let's arbitrate and find
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* out if we should initialize it. Set enabled
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* hub connected at highest or lowest widget as
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* master.
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*/
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#ifdef WIDGET_A
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i = HUB_WIDGET_ID_MAX + 1;
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do {
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i--;
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} while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
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(!XBOW_PORT_IS_ENABLED(xbow_p, i)));
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#else
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i = HUB_WIDGET_ID_MIN - 1;
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do {
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i++;
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} while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
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(!XBOW_PORT_IS_ENABLED(xbow_p, i)));
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#endif
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masterwid = i;
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if (nasid != XBOW_PORT_NASID(xbow_p, i))
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return 1;
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for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) {
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if (XBOW_PORT_IS_ENABLED(xbow_p, i) &&
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XBOW_PORT_TYPE_IO(xbow_p, i))
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probe_one_port(nasid, i, masterwid);
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}
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return 0;
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}
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void xtalk_probe_node(cnodeid_t nid)
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{
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volatile u64 hubreg;
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nasid_t nasid;
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xwidget_part_num_t partnum;
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widgetreg_t widget_id;
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nasid = COMPACT_TO_NASID_NODEID(nid);
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hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR);
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/* check whether the link is up */
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if (!(hubreg & IIO_LLP_CSR_IS_UP))
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return;
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widget_id = *(volatile widgetreg_t *)
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(RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID);
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partnum = XWIDGET_PART_NUM(widget_id);
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printk(KERN_INFO "Cpu %d, Nasid 0x%x: partnum 0x%x is ",
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smp_processor_id(), nasid, partnum);
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switch (partnum) {
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case BRIDGE_WIDGET_PART_NUM:
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bridge_probe(nasid, 0x8, 0xa);
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break;
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case XBOW_WIDGET_PART_NUM:
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case XXBOW_WIDGET_PART_NUM:
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xbow_probe(nasid);
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break;
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default:
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printk(" unknown widget??\n");
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break;
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}
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}
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