1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org) 4 * Copyright (C) 1999, 2000 Silcon Graphics, Inc. 5 * Copyright (C) 2004 Christoph Hellwig. 6 * 7 * Generic XTALK initialization code 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/smp.h> 12 #include <linux/platform_device.h> 13 #include <linux/platform_data/xtalk-bridge.h> 14 #include <asm/sn/addrs.h> 15 #include <asm/sn/types.h> 16 #include <asm/sn/klconfig.h> 17 #include <asm/sn/hub.h> 18 #include <asm/pci/bridge.h> 19 #include <asm/xtalk/xtalk.h> 20 21 22 #define XBOW_WIDGET_PART_NUM 0x0 23 #define XXBOW_WIDGET_PART_NUM 0xd000 /* Xbow in Xbridge */ 24 #define BASE_XBOW_PORT 8 /* Lowest external port */ 25 26 static void bridge_platform_create(nasid_t nasid, int widget, int masterwid) 27 { 28 struct xtalk_bridge_platform_data *bd; 29 struct platform_device *pdev; 30 unsigned long offset; 31 32 bd = kzalloc(sizeof(*bd), GFP_KERNEL); 33 if (!bd) 34 goto no_mem; 35 pdev = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO); 36 if (!pdev) { 37 kfree(bd); 38 goto no_mem; 39 } 40 41 offset = NODE_OFFSET(nasid); 42 43 bd->bridge_addr = RAW_NODE_SWIN_BASE(nasid, widget); 44 bd->intr_addr = BIT_ULL(47) + 0x01800000 + PI_INT_PEND_MOD; 45 bd->nasid = nasid; 46 bd->masterwid = masterwid; 47 48 bd->mem.name = "Bridge PCI MEM"; 49 bd->mem.start = offset + (widget << SWIN_SIZE_BITS); 50 bd->mem.end = bd->mem.start + SWIN_SIZE - 1; 51 bd->mem.flags = IORESOURCE_MEM; 52 bd->mem_offset = offset; 53 54 bd->io.name = "Bridge PCI IO"; 55 bd->io.start = offset + (widget << SWIN_SIZE_BITS); 56 bd->io.end = bd->io.start + SWIN_SIZE - 1; 57 bd->io.flags = IORESOURCE_IO; 58 bd->io_offset = offset; 59 60 platform_device_add_data(pdev, bd, sizeof(*bd)); 61 platform_device_add(pdev); 62 pr_info("xtalk:n%d/%x bridge widget\n", nasid, widget); 63 return; 64 65 no_mem: 66 pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); 67 } 68 69 static int probe_one_port(nasid_t nasid, int widget, int masterwid) 70 { 71 widgetreg_t widget_id; 72 xwidget_part_num_t partnum; 73 74 widget_id = *(volatile widgetreg_t *) 75 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID); 76 partnum = XWIDGET_PART_NUM(widget_id); 77 78 switch (partnum) { 79 case BRIDGE_WIDGET_PART_NUM: 80 case XBRIDGE_WIDGET_PART_NUM: 81 bridge_platform_create(nasid, widget, masterwid); 82 break; 83 default: 84 break; 85 } 86 87 return 0; 88 } 89 90 static int xbow_probe(nasid_t nasid) 91 { 92 lboard_t *brd; 93 klxbow_t *xbow_p; 94 unsigned masterwid, i; 95 96 /* 97 * found xbow, so may have multiple bridges 98 * need to probe xbow 99 */ 100 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8); 101 if (!brd) 102 return -ENODEV; 103 104 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW); 105 if (!xbow_p) 106 return -ENODEV; 107 108 /* 109 * Okay, here's a xbow. Let's arbitrate and find 110 * out if we should initialize it. Set enabled 111 * hub connected at highest or lowest widget as 112 * master. 113 */ 114 #ifdef WIDGET_A 115 i = HUB_WIDGET_ID_MAX + 1; 116 do { 117 i--; 118 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 119 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 120 #else 121 i = HUB_WIDGET_ID_MIN - 1; 122 do { 123 i++; 124 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 125 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 126 #endif 127 128 masterwid = i; 129 if (nasid != XBOW_PORT_NASID(xbow_p, i)) 130 return 1; 131 132 for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) { 133 if (XBOW_PORT_IS_ENABLED(xbow_p, i) && 134 XBOW_PORT_TYPE_IO(xbow_p, i)) 135 probe_one_port(nasid, i, masterwid); 136 } 137 138 return 0; 139 } 140 141 static void xtalk_probe_node(cnodeid_t nid) 142 { 143 volatile u64 hubreg; 144 nasid_t nasid; 145 xwidget_part_num_t partnum; 146 widgetreg_t widget_id; 147 148 nasid = COMPACT_TO_NASID_NODEID(nid); 149 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR); 150 151 /* check whether the link is up */ 152 if (!(hubreg & IIO_LLP_CSR_IS_UP)) 153 return; 154 155 widget_id = *(volatile widgetreg_t *) 156 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID); 157 partnum = XWIDGET_PART_NUM(widget_id); 158 159 switch (partnum) { 160 case BRIDGE_WIDGET_PART_NUM: 161 bridge_platform_create(nasid, 0x8, 0xa); 162 break; 163 case XBOW_WIDGET_PART_NUM: 164 case XXBOW_WIDGET_PART_NUM: 165 pr_info("xtalk:n%d/0 xbow widget\n", nasid); 166 xbow_probe(nasid); 167 break; 168 default: 169 pr_info("xtalk:n%d/0 unknown widget (0x%x)\n", nasid, partnum); 170 break; 171 } 172 } 173 174 static int __init xtalk_init(void) 175 { 176 cnodeid_t cnode; 177 178 for_each_online_node(cnode) 179 xtalk_probe_node(cnode); 180 181 return 0; 182 } 183 arch_initcall(xtalk_init); 184