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
bridge_platform_create(nasid_t nasid,int widget,int masterwid)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
probe_one_port(nasid_t nasid,int widget,int masterwid)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
xbow_probe(nasid_t nasid)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
xtalk_probe_node(nasid_t nasid)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
xtalk_init(void)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);
243