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