xref: /openbmc/linux/arch/mips/sgi-ip27/ip27-xtalk.c (revision 93296e7a)
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