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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | // SPDX-License-Identifier: GPL-2.0 /* * ip30-xtalk.c - Very basic Crosstalk (XIO) detection support. * Copyright (C) 2004-2007 Stanislaw Skowronek <skylark@unaligned.org> * Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de> * Copyright (C) 2007, 2014-2016 Joshua Kinard <kumba@gentoo.org> */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/platform_device.h> #include <linux/platform_data/sgi-w1.h> #include <linux/platform_data/xtalk-bridge.h> #include <asm/xtalk/xwidget.h> #include <asm/pci/bridge.h> #define IP30_SWIN_BASE(widget) \ (0x0000000010000000 | (((unsigned long)(widget)) << 24)) #define IP30_RAW_SWIN_BASE(widget) (IO_BASE + IP30_SWIN_BASE(widget)) #define IP30_SWIN_SIZE (1 << 24) #define IP30_WIDGET_XBOW _AC(0x0, UL) /* XBow is always 0 */ #define IP30_WIDGET_HEART _AC(0x8, UL) /* HEART is always 8 */ #define IP30_WIDGET_PCI_BASE _AC(0xf, UL) /* BaseIO PCI is always 15 */ #define XTALK_NODEV 0xffffffff #define XBOW_REG_LINK_STAT_0 0x114 #define XBOW_REG_LINK_BLK_SIZE 0x40 #define XBOW_REG_LINK_ALIVE 0x80000000 #define HEART_INTR_ADDR 0x00000080 #define xtalk_read __raw_readl static void bridge_platform_create(int widget, int masterwid) { struct xtalk_bridge_platform_data *bd; struct sgi_w1_platform_data *wd; struct platform_device *pdev_wd; struct platform_device *pdev_bd; struct resource w1_res; wd = kzalloc(sizeof(*wd), GFP_KERNEL); if (!wd) { pr_warn("xtalk:%x bridge create out of memory\n", widget); return; } snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx", IP30_SWIN_BASE(widget)); memset(&w1_res, 0, sizeof(w1_res)); w1_res.start = IP30_SWIN_BASE(widget) + offsetof(struct bridge_regs, b_nic); w1_res.end = w1_res.start + 3; w1_res.flags = IORESOURCE_MEM; pdev_wd = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO); if (!pdev_wd) { pr_warn("xtalk:%x bridge create out of memory\n", widget); goto err_kfree_wd; } if (platform_device_add_resources(pdev_wd, &w1_res, 1)) { pr_warn("xtalk:%x bridge failed to add platform resources.\n", widget); goto err_put_pdev_wd; } if (platform_device_add_data(pdev_wd, wd, sizeof(*wd))) { pr_warn("xtalk:%x bridge failed to add platform data.\n", widget); goto err_put_pdev_wd; } if (platform_device_add(pdev_wd)) { pr_warn("xtalk:%x bridge failed to add platform device.\n", widget); goto err_put_pdev_wd; } /* platform_device_add_data() duplicates the data */ kfree(wd); bd = kzalloc(sizeof(*bd), GFP_KERNEL); if (!bd) { pr_warn("xtalk:%x bridge create out of memory\n", widget); goto err_unregister_pdev_wd; } pdev_bd = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO); if (!pdev_bd) { pr_warn("xtalk:%x bridge create out of memory\n", widget); goto err_kfree_bd; } bd->bridge_addr = IP30_RAW_SWIN_BASE(widget); bd->intr_addr = HEART_INTR_ADDR; bd->nasid = 0; bd->masterwid = masterwid; bd->mem.name = "Bridge PCI MEM"; bd->mem.start = IP30_SWIN_BASE(widget) + BRIDGE_DEVIO0; bd->mem.end = IP30_SWIN_BASE(widget) + IP30_SWIN_SIZE - 1; bd->mem.flags = IORESOURCE_MEM; bd->mem_offset = IP30_SWIN_BASE(widget); bd->io.name = "Bridge PCI IO"; bd->io.start = IP30_SWIN_BASE(widget) + BRIDGE_DEVIO0; bd->io.end = IP30_SWIN_BASE(widget) + IP30_SWIN_SIZE - 1; bd->io.flags = IORESOURCE_IO; bd->io_offset = IP30_SWIN_BASE(widget); if (platform_device_add_data(pdev_bd, bd, sizeof(*bd))) { pr_warn("xtalk:%x bridge failed to add platform data.\n", widget); goto err_put_pdev_bd; } if (platform_device_add(pdev_bd)) { pr_warn("xtalk:%x bridge failed to add platform device.\n", widget); goto err_put_pdev_bd; } /* platform_device_add_data() duplicates the data */ kfree(bd); pr_info("xtalk:%x bridge widget\n", widget); return; err_put_pdev_bd: platform_device_put(pdev_bd); err_kfree_bd: kfree(bd); err_unregister_pdev_wd: platform_device_unregister(pdev_wd); return; err_put_pdev_wd: platform_device_put(pdev_wd); err_kfree_wd: kfree(wd); return; } static unsigned int __init xbow_widget_active(s8 wid) { unsigned int link_stat; link_stat = xtalk_read((void *)(IP30_RAW_SWIN_BASE(IP30_WIDGET_XBOW) + XBOW_REG_LINK_STAT_0 + XBOW_REG_LINK_BLK_SIZE * (wid - 8))); return (link_stat & XBOW_REG_LINK_ALIVE) ? 1 : 0; } static void __init xtalk_init_widget(s8 wid, s8 masterwid) { xwidget_part_num_t partnum; widgetreg_t widget_id; if (!xbow_widget_active(wid)) return; widget_id = xtalk_read((void *)(IP30_RAW_SWIN_BASE(wid) + WIDGET_ID)); partnum = XWIDGET_PART_NUM(widget_id); switch (partnum) { case BRIDGE_WIDGET_PART_NUM: case XBRIDGE_WIDGET_PART_NUM: bridge_platform_create(wid, masterwid); break; default: pr_info("xtalk:%x unknown widget (0x%x)\n", wid, partnum); break; } } static int __init ip30_xtalk_init(void) { int i; /* * Walk widget IDs backwards so that BaseIO is probed first. This * ensures that the BaseIO IOC3 is always detected as eth0. */ for (i = IP30_WIDGET_PCI_BASE; i > IP30_WIDGET_HEART; i--) xtalk_init_widget(i, IP30_WIDGET_HEART); return 0; } arch_initcall(ip30_xtalk_init); |