1 /* 2 * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org) 3 * Copyright (C) 1999, 2000 Silcon Graphics, Inc. 4 * Copyright (C) 2004 Christoph Hellwig. 5 * Released under GPL v2. 6 * 7 * Generic XTALK initialization code 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/smp.h> 12 #include <asm/sn/types.h> 13 #include <asm/sn/klconfig.h> 14 #include <asm/sn/hub.h> 15 #include <asm/pci/bridge.h> 16 #include <asm/xtalk/xtalk.h> 17 18 19 #define XBOW_WIDGET_PART_NUM 0x0 20 #define XXBOW_WIDGET_PART_NUM 0xd000 /* Xbow in Xbridge */ 21 #define BASE_XBOW_PORT 8 /* Lowest external port */ 22 23 extern int bridge_probe(nasid_t nasid, int widget, int masterwid); 24 25 static int probe_one_port(nasid_t nasid, int widget, int masterwid) 26 { 27 widgetreg_t widget_id; 28 xwidget_part_num_t partnum; 29 30 widget_id = *(volatile widgetreg_t *) 31 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID); 32 partnum = XWIDGET_PART_NUM(widget_id); 33 34 printk(KERN_INFO "Cpu %d, Nasid 0x%x, widget 0x%x (partnum 0x%x) is ", 35 smp_processor_id(), nasid, widget, partnum); 36 37 switch (partnum) { 38 case BRIDGE_WIDGET_PART_NUM: 39 case XBRIDGE_WIDGET_PART_NUM: 40 bridge_probe(nasid, widget, masterwid); 41 break; 42 default: 43 break; 44 } 45 46 return 0; 47 } 48 49 static int xbow_probe(nasid_t nasid) 50 { 51 lboard_t *brd; 52 klxbow_t *xbow_p; 53 unsigned masterwid, i; 54 55 printk("is xbow\n"); 56 57 /* 58 * found xbow, so may have multiple bridges 59 * need to probe xbow 60 */ 61 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8); 62 if (!brd) 63 return -ENODEV; 64 65 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW); 66 if (!xbow_p) 67 return -ENODEV; 68 69 /* 70 * Okay, here's a xbow. Let's arbitrate and find 71 * out if we should initialize it. Set enabled 72 * hub connected at highest or lowest widget as 73 * master. 74 */ 75 #ifdef WIDGET_A 76 i = HUB_WIDGET_ID_MAX + 1; 77 do { 78 i--; 79 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 80 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 81 #else 82 i = HUB_WIDGET_ID_MIN - 1; 83 do { 84 i++; 85 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 86 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 87 #endif 88 89 masterwid = i; 90 if (nasid != XBOW_PORT_NASID(xbow_p, i)) 91 return 1; 92 93 for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) { 94 if (XBOW_PORT_IS_ENABLED(xbow_p, i) && 95 XBOW_PORT_TYPE_IO(xbow_p, i)) 96 probe_one_port(nasid, i, masterwid); 97 } 98 99 return 0; 100 } 101 102 void xtalk_probe_node(cnodeid_t nid) 103 { 104 volatile u64 hubreg; 105 nasid_t nasid; 106 xwidget_part_num_t partnum; 107 widgetreg_t widget_id; 108 109 nasid = COMPACT_TO_NASID_NODEID(nid); 110 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR); 111 112 /* check whether the link is up */ 113 if (!(hubreg & IIO_LLP_CSR_IS_UP)) 114 return; 115 116 widget_id = *(volatile widgetreg_t *) 117 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID); 118 partnum = XWIDGET_PART_NUM(widget_id); 119 120 printk(KERN_INFO "Cpu %d, Nasid 0x%x: partnum 0x%x is ", 121 smp_processor_id(), nasid, partnum); 122 123 switch (partnum) { 124 case BRIDGE_WIDGET_PART_NUM: 125 bridge_probe(nasid, 0x8, 0xa); 126 break; 127 case XBOW_WIDGET_PART_NUM: 128 case XXBOW_WIDGET_PART_NUM: 129 xbow_probe(nasid); 130 break; 131 default: 132 printk(" unknown widget??\n"); 133 break; 134 } 135 } 136