1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ip30-xtalk.c - Very basic Crosstalk (XIO) detection support. 4 * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org> 5 * Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de> 6 * Copyright (C) 2007, 2014-2016 Joshua Kinard <kumba@gentoo.org> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/platform_device.h> 12 #include <linux/platform_data/sgi-w1.h> 13 #include <linux/platform_data/xtalk-bridge.h> 14 15 #include <asm/xtalk/xwidget.h> 16 #include <asm/pci/bridge.h> 17 18 #define IP30_SWIN_BASE(widget) \ 19 (0x0000000010000000 | (((unsigned long)(widget)) << 24)) 20 21 #define IP30_RAW_SWIN_BASE(widget) (IO_BASE + IP30_SWIN_BASE(widget)) 22 23 #define IP30_SWIN_SIZE (1 << 24) 24 25 #define IP30_WIDGET_XBOW _AC(0x0, UL) /* XBow is always 0 */ 26 #define IP30_WIDGET_HEART _AC(0x8, UL) /* HEART is always 8 */ 27 #define IP30_WIDGET_PCI_BASE _AC(0xf, UL) /* BaseIO PCI is always 15 */ 28 29 #define XTALK_NODEV 0xffffffff 30 31 #define XBOW_REG_LINK_STAT_0 0x114 32 #define XBOW_REG_LINK_BLK_SIZE 0x40 33 #define XBOW_REG_LINK_ALIVE 0x80000000 34 35 #define HEART_INTR_ADDR 0x00000080 36 37 #define xtalk_read __raw_readl 38 39 static void bridge_platform_create(int widget, int masterwid) 40 { 41 struct xtalk_bridge_platform_data *bd; 42 struct sgi_w1_platform_data *wd; 43 struct platform_device *pdev; 44 struct resource w1_res; 45 46 wd = kzalloc(sizeof(*wd), GFP_KERNEL); 47 if (!wd) 48 goto no_mem; 49 50 snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx", 51 IP30_SWIN_BASE(widget)); 52 53 memset(&w1_res, 0, sizeof(w1_res)); 54 w1_res.start = IP30_SWIN_BASE(widget) + 55 offsetof(struct bridge_regs, b_nic); 56 w1_res.end = w1_res.start + 3; 57 w1_res.flags = IORESOURCE_MEM; 58 59 pdev = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO); 60 if (!pdev) { 61 kfree(wd); 62 goto no_mem; 63 } 64 platform_device_add_resources(pdev, &w1_res, 1); 65 platform_device_add_data(pdev, wd, sizeof(*wd)); 66 platform_device_add(pdev); 67 68 bd = kzalloc(sizeof(*bd), GFP_KERNEL); 69 if (!bd) 70 goto no_mem; 71 pdev = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO); 72 if (!pdev) { 73 kfree(bd); 74 goto no_mem; 75 } 76 77 bd->bridge_addr = IP30_RAW_SWIN_BASE(widget); 78 bd->intr_addr = HEART_INTR_ADDR; 79 bd->nasid = 0; 80 bd->masterwid = masterwid; 81 82 bd->mem.name = "Bridge PCI MEM"; 83 bd->mem.start = IP30_SWIN_BASE(widget) + BRIDGE_DEVIO0; 84 bd->mem.end = IP30_SWIN_BASE(widget) + IP30_SWIN_SIZE - 1; 85 bd->mem.flags = IORESOURCE_MEM; 86 bd->mem_offset = IP30_SWIN_BASE(widget); 87 88 bd->io.name = "Bridge PCI IO"; 89 bd->io.start = IP30_SWIN_BASE(widget) + BRIDGE_DEVIO0; 90 bd->io.end = IP30_SWIN_BASE(widget) + IP30_SWIN_SIZE - 1; 91 bd->io.flags = IORESOURCE_IO; 92 bd->io_offset = IP30_SWIN_BASE(widget); 93 94 platform_device_add_data(pdev, bd, sizeof(*bd)); 95 platform_device_add(pdev); 96 pr_info("xtalk:%x bridge widget\n", widget); 97 return; 98 99 no_mem: 100 pr_warn("xtalk:%x bridge create out of memory\n", widget); 101 } 102 103 static unsigned int __init xbow_widget_active(s8 wid) 104 { 105 unsigned int link_stat; 106 107 link_stat = xtalk_read((void *)(IP30_RAW_SWIN_BASE(IP30_WIDGET_XBOW) + 108 XBOW_REG_LINK_STAT_0 + 109 XBOW_REG_LINK_BLK_SIZE * 110 (wid - 8))); 111 112 return (link_stat & XBOW_REG_LINK_ALIVE) ? 1 : 0; 113 } 114 115 static void __init xtalk_init_widget(s8 wid, s8 masterwid) 116 { 117 xwidget_part_num_t partnum; 118 widgetreg_t widget_id; 119 120 if (!xbow_widget_active(wid)) 121 return; 122 123 widget_id = xtalk_read((void *)(IP30_RAW_SWIN_BASE(wid) + WIDGET_ID)); 124 125 partnum = XWIDGET_PART_NUM(widget_id); 126 127 switch (partnum) { 128 case BRIDGE_WIDGET_PART_NUM: 129 case XBRIDGE_WIDGET_PART_NUM: 130 bridge_platform_create(wid, masterwid); 131 break; 132 default: 133 pr_info("xtalk:%x unknown widget (0x%x)\n", wid, partnum); 134 break; 135 } 136 } 137 138 static int __init ip30_xtalk_init(void) 139 { 140 int i; 141 142 /* 143 * Walk widget IDs backwards so that BaseIO is probed first. This 144 * ensures that the BaseIO IOC3 is always detected as eth0. 145 */ 146 for (i = IP30_WIDGET_PCI_BASE; i > IP30_WIDGET_HEART; i--) 147 xtalk_init_widget(i, IP30_WIDGET_HEART); 148 149 return 0; 150 } 151 152 arch_initcall(ip30_xtalk_init); 153