arch/mips/sgi-ip27/ip27-xtalk.c

   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_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
 114 err_put_pdev_bd:
 115         platform_device_put(pdev_bd);
 116 err_kfree_bd:
 117         kfree(bd);
 118 err_unregister_pdev_wd:
 119         platform_device_unregister(pdev_wd);
 120         return;
 121 err_put_pdev_wd:
 122         platform_device_put(pdev_wd);
 123 err_kfree_wd:
 124         kfree(wd);
 125         return;
 126 }
 127
 128 static 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
 151 static 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
 202 static 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
 233 static 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 }
 242 arch_initcall(xtalk_init);