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/sgi-w1.h> 14 #include <linux/platform_data/xtalk-bridge.h> 15 #include <asm/sn/addrs.h> 16 #include <asm/sn/types.h> 17 #include <asm/sn/klconfig.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 sgi_w1_platform_data *wd; 30 struct platform_device *pdev; 31 struct resource w1_res; 32 unsigned long offset; 33 34 offset = NODE_OFFSET(nasid); 35 36 wd = kzalloc(sizeof(*wd), GFP_KERNEL); 37 if (!wd) 38 goto no_mem; 39 40 snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx", 41 offset + (widget << SWIN_SIZE_BITS)); 42 43 memset(&w1_res, 0, sizeof(w1_res)); 44 w1_res.start = offset + (widget << SWIN_SIZE_BITS) + 45 offsetof(struct bridge_regs, b_nic); 46 w1_res.end = w1_res.start + 3; 47 w1_res.flags = IORESOURCE_MEM; 48 49 pdev = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO); 50 if (!pdev) { 51 kfree(wd); 52 goto no_mem; 53 } 54 platform_device_add_resources(pdev, &w1_res, 1); 55 platform_device_add_data(pdev, wd, sizeof(*wd)); 56 platform_device_add(pdev); 57 58 bd = kzalloc(sizeof(*bd), GFP_KERNEL); 59 if (!bd) 60 goto no_mem; 61 pdev = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO); 62 if (!pdev) { 63 kfree(bd); 64 goto no_mem; 65 } 66 67 68 bd->bridge_addr = RAW_NODE_SWIN_BASE(nasid, widget); 69 bd->intr_addr = BIT_ULL(47) + 0x01800000 + PI_INT_PEND_MOD; 70 bd->nasid = nasid; 71 bd->masterwid = masterwid; 72 73 bd->mem.name = "Bridge PCI MEM"; 74 bd->mem.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0; 75 bd->mem.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1; 76 bd->mem.flags = IORESOURCE_MEM; 77 bd->mem_offset = offset; 78 79 bd->io.name = "Bridge PCI IO"; 80 bd->io.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0; 81 bd->io.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1; 82 bd->io.flags = IORESOURCE_IO; 83 bd->io_offset = offset; 84 85 platform_device_add_data(pdev, bd, sizeof(*bd)); 86 platform_device_add(pdev); 87 pr_info("xtalk:n%d/%x bridge widget\n", nasid, widget); 88 return; 89 90 no_mem: 91 pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); 92 } 93 94 static int probe_one_port(nasid_t nasid, int widget, int masterwid) 95 { 96 widgetreg_t widget_id; 97 xwidget_part_num_t partnum; 98 99 widget_id = *(volatile widgetreg_t *) 100 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID); 101 partnum = XWIDGET_PART_NUM(widget_id); 102 103 switch (partnum) { 104 case BRIDGE_WIDGET_PART_NUM: 105 case XBRIDGE_WIDGET_PART_NUM: 106 bridge_platform_create(nasid, widget, masterwid); 107 break; 108 default: 109 pr_info("xtalk:n%d/%d unknown widget (0x%x)\n", 110 nasid, widget, partnum); 111 break; 112 } 113 114 return 0; 115 } 116 117 static int xbow_probe(nasid_t nasid) 118 { 119 lboard_t *brd; 120 klxbow_t *xbow_p; 121 unsigned masterwid, i; 122 123 /* 124 * found xbow, so may have multiple bridges 125 * need to probe xbow 126 */ 127 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8); 128 if (!brd) 129 return -ENODEV; 130 131 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW); 132 if (!xbow_p) 133 return -ENODEV; 134 135 /* 136 * Okay, here's a xbow. Let's arbitrate and find 137 * out if we should initialize it. Set enabled 138 * hub connected at highest or lowest widget as 139 * master. 140 */ 141 #ifdef WIDGET_A 142 i = HUB_WIDGET_ID_MAX + 1; 143 do { 144 i--; 145 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 146 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 147 #else 148 i = HUB_WIDGET_ID_MIN - 1; 149 do { 150 i++; 151 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 152 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 153 #endif 154 155 masterwid = i; 156 if (nasid != XBOW_PORT_NASID(xbow_p, i)) 157 return 1; 158 159 for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) { 160 if (XBOW_PORT_IS_ENABLED(xbow_p, i) && 161 XBOW_PORT_TYPE_IO(xbow_p, i)) 162 probe_one_port(nasid, i, masterwid); 163 } 164 165 return 0; 166 } 167 168 static void xtalk_probe_node(nasid_t nasid) 169 { 170 volatile u64 hubreg; 171 xwidget_part_num_t partnum; 172 widgetreg_t widget_id; 173 174 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR); 175 176 /* check whether the link is up */ 177 if (!(hubreg & IIO_LLP_CSR_IS_UP)) 178 return; 179 180 widget_id = *(volatile widgetreg_t *) 181 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID); 182 partnum = XWIDGET_PART_NUM(widget_id); 183 184 switch (partnum) { 185 case BRIDGE_WIDGET_PART_NUM: 186 bridge_platform_create(nasid, 0x8, 0xa); 187 break; 188 case XBOW_WIDGET_PART_NUM: 189 case XXBOW_WIDGET_PART_NUM: 190 pr_info("xtalk:n%d/0 xbow widget\n", nasid); 191 xbow_probe(nasid); 192 break; 193 default: 194 pr_info("xtalk:n%d/0 unknown widget (0x%x)\n", nasid, partnum); 195 break; 196 } 197 } 198 199 static int __init xtalk_init(void) 200 { 201 nasid_t nasid; 202 203 for_each_online_node(nasid) 204 xtalk_probe_node(nasid); 205 206 return 0; 207 } 208 arch_initcall(xtalk_init); 209