1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 1999, 2000 Ralf Baechle (ralf@gnu.org)
4 * Copyright (C) 1999, 2000 Silcon Graphics, Inc.
5 * Copyright (C) 2004 Christoph Hellwig.
7 * Generic XTALK initialization code
10 #include <linux/kernel.h>
11 #include <linux/smp.h>
12 #include <linux/platform_device.h>
13 #include <linux/platform_data/xtalk-bridge.h>
14 #include <asm/sn/addrs.h>
15 #include <asm/sn/types.h>
16 #include <asm/sn/klconfig.h>
17 #include <asm/sn/hub.h>
18 #include <asm/pci/bridge.h>
19 #include <asm/xtalk/xtalk.h>
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 */
26 static void bridge_platform_create(nasid_t nasid, int widget, int masterwid)
28 struct xtalk_bridge_platform_data *bd;
29 struct platform_device *pdev;
32 bd = kzalloc(sizeof(*bd), GFP_KERNEL);
35 pdev = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO);
41 offset = NODE_OFFSET(nasid);
43 bd->bridge_addr = RAW_NODE_SWIN_BASE(nasid, widget);
44 bd->intr_addr = BIT_ULL(47) + 0x01800000 + PI_INT_PEND_MOD;
46 bd->masterwid = masterwid;
48 bd->mem.name = "Bridge PCI MEM";
49 bd->mem.start = offset + (widget << SWIN_SIZE_BITS);
50 bd->mem.end = bd->mem.start + SWIN_SIZE - 1;
51 bd->mem.flags = IORESOURCE_MEM;
52 bd->mem_offset = offset;
54 bd->io.name = "Bridge PCI IO";
55 bd->io.start = offset + (widget << SWIN_SIZE_BITS);
56 bd->io.end = bd->io.start + SWIN_SIZE - 1;
57 bd->io.flags = IORESOURCE_IO;
58 bd->io_offset = offset;
60 platform_device_add_data(pdev, bd, sizeof(*bd));
61 platform_device_add(pdev);
62 pr_info("xtalk:n%d/%x bridge widget\n", nasid, widget);
66 pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget);
69 static int probe_one_port(nasid_t nasid, int widget, int masterwid)
71 widgetreg_t widget_id;
72 xwidget_part_num_t partnum;
74 widget_id = *(volatile widgetreg_t *)
75 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID);
76 partnum = XWIDGET_PART_NUM(widget_id);
79 case BRIDGE_WIDGET_PART_NUM:
80 case XBRIDGE_WIDGET_PART_NUM:
81 bridge_platform_create(nasid, widget, masterwid);
90 static int xbow_probe(nasid_t nasid)
94 unsigned masterwid, i;
97 * found xbow, so may have multiple bridges
100 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8);
104 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
109 * Okay, here's a xbow. Let's arbitrate and find
110 * out if we should initialize it. Set enabled
111 * hub connected at highest or lowest widget as
115 i = HUB_WIDGET_ID_MAX + 1;
118 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
119 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
121 i = HUB_WIDGET_ID_MIN - 1;
124 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
125 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
129 if (nasid != XBOW_PORT_NASID(xbow_p, i))
132 for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) {
133 if (XBOW_PORT_IS_ENABLED(xbow_p, i) &&
134 XBOW_PORT_TYPE_IO(xbow_p, i))
135 probe_one_port(nasid, i, masterwid);
141 static void xtalk_probe_node(cnodeid_t nid)
145 xwidget_part_num_t partnum;
146 widgetreg_t widget_id;
148 nasid = COMPACT_TO_NASID_NODEID(nid);
149 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR);
151 /* check whether the link is up */
152 if (!(hubreg & IIO_LLP_CSR_IS_UP))
155 widget_id = *(volatile widgetreg_t *)
156 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID);
157 partnum = XWIDGET_PART_NUM(widget_id);
160 case BRIDGE_WIDGET_PART_NUM:
161 bridge_platform_create(nasid, 0x8, 0xa);
163 case XBOW_WIDGET_PART_NUM:
164 case XXBOW_WIDGET_PART_NUM:
165 pr_info("xtalk:n%d/0 xbow widget\n", nasid);
169 pr_info("xtalk:n%d/0 unknown widget (0x%x)\n", nasid, partnum);
174 static int __init xtalk_init(void)
178 for_each_online_node(cnode)
179 xtalk_probe_node(cnode);
183 arch_initcall(xtalk_init);