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 26static 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_wd; 31 struct platform_device *pdev_bd; 32 struct resource w1_res; 33 unsigned long offset; 34 35 offset = NODE_OFFSET(nasid); 36 37 wd = kzalloc(sizeof(*wd), GFP_KERNEL); 38 if (!wd) { 39 pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); 40 return; 41 } 42 43 snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx", 44 offset + (widget << SWIN_SIZE_BITS)); 45 46 memset(&w1_res, 0, sizeof(w1_res)); 47 w1_res.start = offset + (widget << SWIN_SIZE_BITS) + 48 offsetof(struct bridge_regs, b_nic); 49 w1_res.end = w1_res.start + 3; 50 w1_res.flags = IORESOURCE_MEM; 51 52 pdev_wd = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO); 53 if (!pdev_wd) { 54 pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); 55 goto err_kfree_wd; 56 } 57 if (platform_device_add_resources(pdev_wd, &w1_res, 1)) { 58 pr_warn("xtalk:n%d/%x bridge failed to add platform resources.\n", nasid, widget); 59 goto err_put_pdev_wd; 60 } 61 if (platform_device_add_data(pdev_wd, wd, sizeof(*wd))) { 62 pr_warn("xtalk:n%d/%x bridge failed to add platform data.\n", nasid, widget); 63 goto err_put_pdev_wd; 64 } 65 if (platform_device_add(pdev_wd)) { 66 pr_warn("xtalk:n%d/%x bridge failed to add platform device.\n", nasid, widget); 67 goto err_put_pdev_wd; 68 } 69 /* platform_device_add_data() duplicates the data */ 70 kfree(wd); 71 72 bd = kzalloc(sizeof(*bd), GFP_KERNEL); 73 if (!bd) { 74 pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); 75 goto err_unregister_pdev_wd; 76 } 77 pdev_bd = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO); 78 if (!pdev_bd) { 79 pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); 80 goto err_kfree_bd; 81 } 82 83 84 bd->bridge_addr = RAW_NODE_SWIN_BASE(nasid, widget); 85 bd->intr_addr = BIT_ULL(47) + 0x01800000 + PI_INT_PEND_MOD; 86 bd->nasid = nasid; 87 bd->masterwid = masterwid; 88 89 bd->mem.name = "Bridge PCI MEM"; 90 bd->mem.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0; 91 bd->mem.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1; 92 bd->mem.flags = IORESOURCE_MEM; 93 bd->mem_offset = offset; 94 95 bd->io.name = "Bridge PCI IO"; 96 bd->io.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0; 97 bd->io.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1; 98 bd->io.flags = IORESOURCE_IO; 99 bd->io_offset = offset; 100 101 if (platform_device_add_data(pdev_bd, bd, sizeof(*bd))) { 102 pr_warn("xtalk:n%d/%x bridge failed to add platform data.\n", nasid, widget); 103 goto err_put_pdev_bd; 104 } 105 if (platform_device_add(pdev_bd)) { 106 pr_warn("xtalk:n%d/%x bridge failed to add platform device.\n", nasid, widget); 107 goto err_put_pdev_bd; 108 } 109 /* platform_device_add_data() duplicates the data */ 110 kfree(bd); 111 pr_info("xtalk:n%d/%x bridge widget\n", nasid, widget); 112 return; 113 114err_put_pdev_bd: 115 platform_device_put(pdev_bd); 116err_kfree_bd: 117 kfree(bd); 118err_unregister_pdev_wd: 119 platform_device_unregister(pdev_wd); 120 return; 121err_put_pdev_wd: 122 platform_device_put(pdev_wd); 123err_kfree_wd: 124 kfree(wd); 125 return; 126} 127 128static int probe_one_port(nasid_t nasid, int widget, int masterwid) 129{ 130 widgetreg_t widget_id; 131 xwidget_part_num_t partnum; 132 133 widget_id = *(volatile widgetreg_t *) 134 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID); 135 partnum = XWIDGET_PART_NUM(widget_id); 136 137 switch (partnum) { 138 case BRIDGE_WIDGET_PART_NUM: 139 case XBRIDGE_WIDGET_PART_NUM: 140 bridge_platform_create(nasid, widget, masterwid); 141 break; 142 default: 143 pr_info("xtalk:n%d/%d unknown widget (0x%x)\n", 144 nasid, widget, partnum); 145 break; 146 } 147 148 return 0; 149} 150 151static int xbow_probe(nasid_t nasid) 152{ 153 lboard_t *brd; 154 klxbow_t *xbow_p; 155 unsigned masterwid, i; 156 157 /* 158 * found xbow, so may have multiple bridges 159 * need to probe xbow 160 */ 161 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8); 162 if (!brd) 163 return -ENODEV; 164 165 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW); 166 if (!xbow_p) 167 return -ENODEV; 168 169 /* 170 * Okay, here's a xbow. Let's arbitrate and find 171 * out if we should initialize it. Set enabled 172 * hub connected at highest or lowest widget as 173 * master. 174 */ 175#ifdef WIDGET_A 176 i = HUB_WIDGET_ID_MAX + 1; 177 do { 178 i--; 179 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 180 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 181#else 182 i = HUB_WIDGET_ID_MIN - 1; 183 do { 184 i++; 185 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 186 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 187#endif 188 189 masterwid = i; 190 if (nasid != XBOW_PORT_NASID(xbow_p, i)) 191 return 1; 192 193 for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) { 194 if (XBOW_PORT_IS_ENABLED(xbow_p, i) && 195 XBOW_PORT_TYPE_IO(xbow_p, i)) 196 probe_one_port(nasid, i, masterwid); 197 } 198 199 return 0; 200} 201 202static void xtalk_probe_node(nasid_t nasid) 203{ 204 volatile u64 hubreg; 205 xwidget_part_num_t partnum; 206 widgetreg_t widget_id; 207 208 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR); 209 210 /* check whether the link is up */ 211 if (!(hubreg & IIO_LLP_CSR_IS_UP)) 212 return; 213 214 widget_id = *(volatile widgetreg_t *) 215 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID); 216 partnum = XWIDGET_PART_NUM(widget_id); 217 218 switch (partnum) { 219 case BRIDGE_WIDGET_PART_NUM: 220 bridge_platform_create(nasid, 0x8, 0xa); 221 break; 222 case XBOW_WIDGET_PART_NUM: 223 case XXBOW_WIDGET_PART_NUM: 224 pr_info("xtalk:n%d/0 xbow widget\n", nasid); 225 xbow_probe(nasid); 226 break; 227 default: 228 pr_info("xtalk:n%d/0 unknown widget (0x%x)\n", nasid, partnum); 229 break; 230 } 231} 232 233static int __init xtalk_init(void) 234{ 235 nasid_t nasid; 236 237 for_each_online_node(nasid) 238 xtalk_probe_node(nasid); 239 240 return 0; 241} 242arch_initcall(xtalk_init); 243