Eric Lee / smarc-fsl-linux-kernel

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arch/mips/sgi-ip27/ip27-xtalk.c 3.07 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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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/init.h>
  #include <linux/kernel.h>
631330f58   Ralf Baechle   MIPS: Build fix -... 
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  #include <linux/smp.h>
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #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);
234fcd148   Ralf Baechle   [MIPS] Fix loads ... 
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  static int __cpuinit probe_one_port(nasid_t nasid, int widget, int masterwid)
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  {
  	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;
  }
234fcd148   Ralf Baechle   [MIPS] Fix loads ... 
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  static int __cpuinit xbow_probe(nasid_t nasid)
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  {
  	lboard_t *brd;
  	klxbow_t *xbow_p;
  	unsigned masterwid, i;
  
  	printk("is xbow
  ");
  
  	/*
  	 * 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;
  }
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  void __cpuinit xtalk_probe_node(cnodeid_t nid)
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  {
  	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??
  ");
  		break;
  	}
  }