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/init.h> 11 #include <linux/kernel.h> 12 #include <linux/smp.h> 13 #include <asm/sn/types.h> 14 #include <asm/sn/klconfig.h> 15 #include <asm/sn/hub.h> 16 #include <asm/pci/bridge.h> 17 #include <asm/xtalk/xtalk.h> 18 19 20 #define XBOW_WIDGET_PART_NUM 0x0 21 #define XXBOW_WIDGET_PART_NUM 0xd000 /* Xbow in Xbridge */ 22 #define BASE_XBOW_PORT 8 /* Lowest external port */ 23 24 extern int bridge_probe(nasid_t nasid, int widget, int masterwid); 25 26 static int __cpuinit probe_one_port(nasid_t nasid, int widget, int masterwid) 27 { 28 widgetreg_t widget_id; 29 xwidget_part_num_t partnum; 30 31 widget_id = *(volatile widgetreg_t *) 32 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID); 33 partnum = XWIDGET_PART_NUM(widget_id); 34 35 printk(KERN_INFO "Cpu %d, Nasid 0x%x, widget 0x%x (partnum 0x%x) is ", 36 smp_processor_id(), nasid, widget, partnum); 37 38 switch (partnum) { 39 case BRIDGE_WIDGET_PART_NUM: 40 case XBRIDGE_WIDGET_PART_NUM: 41 bridge_probe(nasid, widget, masterwid); 42 break; 43 default: 44 break; 45 } 46 47 return 0; 48 } 49 50 static int __cpuinit xbow_probe(nasid_t nasid) 51 { 52 lboard_t *brd; 53 klxbow_t *xbow_p; 54 unsigned masterwid, i; 55 56 printk("is xbow\n"); 57 58 /* 59 * found xbow, so may have multiple bridges 60 * need to probe xbow 61 */ 62 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8); 63 if (!brd) 64 return -ENODEV; 65 66 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW); 67 if (!xbow_p) 68 return -ENODEV; 69 70 /* 71 * Okay, here's a xbow. Lets arbitrate and find 72 * out if we should initialize it. Set enabled 73 * hub connected at highest or lowest widget as 74 * master. 75 */ 76 #ifdef WIDGET_A 77 i = HUB_WIDGET_ID_MAX + 1; 78 do { 79 i--; 80 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 81 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 82 #else 83 i = HUB_WIDGET_ID_MIN - 1; 84 do { 85 i++; 86 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 87 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 88 #endif 89 90 masterwid = i; 91 if (nasid != XBOW_PORT_NASID(xbow_p, i)) 92 return 1; 93 94 for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) { 95 if (XBOW_PORT_IS_ENABLED(xbow_p, i) && 96 XBOW_PORT_TYPE_IO(xbow_p, i)) 97 probe_one_port(nasid, i, masterwid); 98 } 99 100 return 0; 101 } 102 103 void __cpuinit xtalk_probe_node(cnodeid_t nid) 104 { 105 volatile u64 hubreg; 106 nasid_t nasid; 107 xwidget_part_num_t partnum; 108 widgetreg_t widget_id; 109 110 nasid = COMPACT_TO_NASID_NODEID(nid); 111 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR); 112 113 /* check whether the link is up */ 114 if (!(hubreg & IIO_LLP_CSR_IS_UP)) 115 return; 116 117 widget_id = *(volatile widgetreg_t *) 118 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID); 119 partnum = XWIDGET_PART_NUM(widget_id); 120 121 printk(KERN_INFO "Cpu %d, Nasid 0x%x: partnum 0x%x is ", 122 smp_processor_id(), nasid, partnum); 123 124 switch (partnum) { 125 case BRIDGE_WIDGET_PART_NUM: 126 bridge_probe(nasid, 0x8, 0xa); 127 break; 128 case XBOW_WIDGET_PART_NUM: 129 case XXBOW_WIDGET_PART_NUM: 130 xbow_probe(nasid); 131 break; 132 default: 133 printk(" unknown widget??\n"); 134 break; 135 } 136 } 137