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/sn/hub.h> 19 #include <asm/pci/bridge.h> 20 #include <asm/xtalk/xtalk.h> 21 22 23 #define XBOW_WIDGET_PART_NUM 0x0 24 #define XXBOW_WIDGET_PART_NUM 0xd000 /* Xbow in Xbridge */ 25 #define BASE_XBOW_PORT 8 /* Lowest external port */ 26 27 static void bridge_platform_create(nasid_t nasid, int widget, int masterwid) 28 { 29 struct xtalk_bridge_platform_data *bd; 30 struct sgi_w1_platform_data *wd; 31 struct platform_device *pdev; 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 goto no_mem; 40 41 snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx", 42 offset + (widget << SWIN_SIZE_BITS)); 43 44 memset(&w1_res, 0, sizeof(w1_res)); 45 w1_res.start = offset + (widget << SWIN_SIZE_BITS) + 46 offsetof(struct bridge_regs, b_nic); 47 w1_res.end = w1_res.start + 3; 48 w1_res.flags = IORESOURCE_MEM; 49 50 pdev = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO); 51 if (!pdev) { 52 kfree(wd); 53 goto no_mem; 54 } 55 platform_device_add_resources(pdev, &w1_res, 1); 56 platform_device_add_data(pdev, wd, sizeof(*wd)); 57 platform_device_add(pdev); 58 59 bd = kzalloc(sizeof(*bd), GFP_KERNEL); 60 if (!bd) 61 goto no_mem; 62 pdev = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO); 63 if (!pdev) { 64 kfree(bd); 65 goto no_mem; 66 } 67 68 69 bd->bridge_addr = RAW_NODE_SWIN_BASE(nasid, widget); 70 bd->intr_addr = BIT_ULL(47) + 0x01800000 + PI_INT_PEND_MOD; 71 bd->nasid = nasid; 72 bd->masterwid = masterwid; 73 74 bd->mem.name = "Bridge PCI MEM"; 75 bd->mem.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0; 76 bd->mem.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1; 77 bd->mem.flags = IORESOURCE_MEM; 78 bd->mem_offset = offset; 79 80 bd->io.name = "Bridge PCI IO"; 81 bd->io.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0; 82 bd->io.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1; 83 bd->io.flags = IORESOURCE_IO; 84 bd->io_offset = offset; 85 86 platform_device_add_data(pdev, bd, sizeof(*bd)); 87 platform_device_add(pdev); 88 pr_info("xtalk:n%d/%x bridge widget\n", nasid, widget); 89 return; 90 91 no_mem: 92 pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget); 93 } 94 95 static int probe_one_port(nasid_t nasid, int widget, int masterwid) 96 { 97 widgetreg_t widget_id; 98 xwidget_part_num_t partnum; 99 100 widget_id = *(volatile widgetreg_t *) 101 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID); 102 partnum = XWIDGET_PART_NUM(widget_id); 103 104 switch (partnum) { 105 case BRIDGE_WIDGET_PART_NUM: 106 case XBRIDGE_WIDGET_PART_NUM: 107 bridge_platform_create(nasid, widget, masterwid); 108 break; 109 default: 110 pr_info("xtalk:n%d/%d unknown widget (0x%x)\n", 111 nasid, widget, partnum); 112 break; 113 } 114 115 return 0; 116 } 117 118 static int xbow_probe(nasid_t nasid) 119 { 120 lboard_t *brd; 121 klxbow_t *xbow_p; 122 unsigned masterwid, i; 123 124 /* 125 * found xbow, so may have multiple bridges 126 * need to probe xbow 127 */ 128 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8); 129 if (!brd) 130 return -ENODEV; 131 132 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW); 133 if (!xbow_p) 134 return -ENODEV; 135 136 /* 137 * Okay, here's a xbow. Let's arbitrate and find 138 * out if we should initialize it. Set enabled 139 * hub connected at highest or lowest widget as 140 * master. 141 */ 142 #ifdef WIDGET_A 143 i = HUB_WIDGET_ID_MAX + 1; 144 do { 145 i--; 146 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 147 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 148 #else 149 i = HUB_WIDGET_ID_MIN - 1; 150 do { 151 i++; 152 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) || 153 (!XBOW_PORT_IS_ENABLED(xbow_p, i))); 154 #endif 155 156 masterwid = i; 157 if (nasid != XBOW_PORT_NASID(xbow_p, i)) 158 return 1; 159 160 for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) { 161 if (XBOW_PORT_IS_ENABLED(xbow_p, i) && 162 XBOW_PORT_TYPE_IO(xbow_p, i)) 163 probe_one_port(nasid, i, masterwid); 164 } 165 166 return 0; 167 } 168 169 static void xtalk_probe_node(nasid_t nasid) 170 { 171 volatile u64 hubreg; 172 xwidget_part_num_t partnum; 173 widgetreg_t widget_id; 174 175 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR); 176 177 /* check whether the link is up */ 178 if (!(hubreg & IIO_LLP_CSR_IS_UP)) 179 return; 180 181 widget_id = *(volatile widgetreg_t *) 182 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID); 183 partnum = XWIDGET_PART_NUM(widget_id); 184 185 switch (partnum) { 186 case BRIDGE_WIDGET_PART_NUM: 187 bridge_platform_create(nasid, 0x8, 0xa); 188 break; 189 case XBOW_WIDGET_PART_NUM: 190 case XXBOW_WIDGET_PART_NUM: 191 pr_info("xtalk:n%d/0 xbow widget\n", nasid); 192 xbow_probe(nasid); 193 break; 194 default: 195 pr_info("xtalk:n%d/0 unknown widget (0x%x)\n", nasid, partnum); 196 break; 197 } 198 } 199 200 static int __init xtalk_init(void) 201 { 202 nasid_t nasid; 203 204 for_each_online_node(nasid) 205 xtalk_probe_node(nasid); 206 207 return 0; 208 } 209 arch_initcall(xtalk_init); 210