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/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>
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 sgi_w1_platform_data *wd;
30 struct platform_device *pdev;
31 struct resource w1_res;
34 offset = NODE_OFFSET(nasid);
36 wd = kzalloc(sizeof(*wd), GFP_KERNEL);
40 snprintf(wd->dev_id, sizeof(wd->dev_id), "bridge-%012lx",
41 offset + (widget << SWIN_SIZE_BITS));
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;
49 pdev = platform_device_alloc("sgi_w1", PLATFORM_DEVID_AUTO);
54 platform_device_add_resources(pdev, &w1_res, 1);
55 platform_device_add_data(pdev, wd, sizeof(*wd));
56 /* platform_device_add_data() duplicates the data */
58 platform_device_add(pdev);
60 bd = kzalloc(sizeof(*bd), GFP_KERNEL);
63 pdev = platform_device_alloc("xtalk-bridge", PLATFORM_DEVID_AUTO);
70 bd->bridge_addr = RAW_NODE_SWIN_BASE(nasid, widget);
71 bd->intr_addr = BIT_ULL(47) + 0x01800000 + PI_INT_PEND_MOD;
73 bd->masterwid = masterwid;
75 bd->mem.name = "Bridge PCI MEM";
76 bd->mem.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0;
77 bd->mem.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1;
78 bd->mem.flags = IORESOURCE_MEM;
79 bd->mem_offset = offset;
81 bd->io.name = "Bridge PCI IO";
82 bd->io.start = offset + (widget << SWIN_SIZE_BITS) + BRIDGE_DEVIO0;
83 bd->io.end = offset + (widget << SWIN_SIZE_BITS) + SWIN_SIZE - 1;
84 bd->io.flags = IORESOURCE_IO;
85 bd->io_offset = offset;
87 platform_device_add_data(pdev, bd, sizeof(*bd));
88 /* platform_device_add_data() duplicates the data */
90 platform_device_add(pdev);
91 pr_info("xtalk:n%d/%x bridge widget\n", nasid, widget);
95 pr_warn("xtalk:n%d/%x bridge create out of memory\n", nasid, widget);
98 static int probe_one_port(nasid_t nasid, int widget, int masterwid)
100 widgetreg_t widget_id;
101 xwidget_part_num_t partnum;
103 widget_id = *(volatile widgetreg_t *)
104 (RAW_NODE_SWIN_BASE(nasid, widget) + WIDGET_ID);
105 partnum = XWIDGET_PART_NUM(widget_id);
108 case BRIDGE_WIDGET_PART_NUM:
109 case XBRIDGE_WIDGET_PART_NUM:
110 bridge_platform_create(nasid, widget, masterwid);
113 pr_info("xtalk:n%d/%d unknown widget (0x%x)\n",
114 nasid, widget, partnum);
121 static int xbow_probe(nasid_t nasid)
125 unsigned masterwid, i;
128 * found xbow, so may have multiple bridges
131 brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_MIDPLANE8);
135 xbow_p = (klxbow_t *)find_component(brd, NULL, KLSTRUCT_XBOW);
140 * Okay, here's a xbow. Let's arbitrate and find
141 * out if we should initialize it. Set enabled
142 * hub connected at highest or lowest widget as
146 i = HUB_WIDGET_ID_MAX + 1;
149 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
150 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
152 i = HUB_WIDGET_ID_MIN - 1;
155 } while ((!XBOW_PORT_TYPE_HUB(xbow_p, i)) ||
156 (!XBOW_PORT_IS_ENABLED(xbow_p, i)));
160 if (nasid != XBOW_PORT_NASID(xbow_p, i))
163 for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++) {
164 if (XBOW_PORT_IS_ENABLED(xbow_p, i) &&
165 XBOW_PORT_TYPE_IO(xbow_p, i))
166 probe_one_port(nasid, i, masterwid);
172 static void xtalk_probe_node(nasid_t nasid)
175 xwidget_part_num_t partnum;
176 widgetreg_t widget_id;
178 hubreg = REMOTE_HUB_L(nasid, IIO_LLP_CSR);
180 /* check whether the link is up */
181 if (!(hubreg & IIO_LLP_CSR_IS_UP))
184 widget_id = *(volatile widgetreg_t *)
185 (RAW_NODE_SWIN_BASE(nasid, 0x0) + WIDGET_ID);
186 partnum = XWIDGET_PART_NUM(widget_id);
189 case BRIDGE_WIDGET_PART_NUM:
190 bridge_platform_create(nasid, 0x8, 0xa);
192 case XBOW_WIDGET_PART_NUM:
193 case XXBOW_WIDGET_PART_NUM:
194 pr_info("xtalk:n%d/0 xbow widget\n", nasid);
198 pr_info("xtalk:n%d/0 unknown widget (0x%x)\n", nasid, partnum);
203 static int __init xtalk_init(void)
207 for_each_online_node(nasid)
208 xtalk_probe_node(nasid);
212 arch_initcall(xtalk_init);