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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/bus/vexpress-config.c
....@@ -1,22 +1,66 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
2
- * This program is free software; you can redistribute it and/or modify
3
- * it under the terms of the GNU General Public License version 2 as
4
- * published by the Free Software Foundation.
5
- *
6
- * This program is distributed in the hope that it will be useful,
7
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
8
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9
- * GNU General Public License for more details.
103  *
114  * Copyright (C) 2014 ARM Limited
125  */
136 
147 #include <linux/err.h>
158 #include <linux/init.h>
9
+#include <linux/io.h>
10
+#include <linux/module.h>
1611 #include <linux/of.h>
12
+#include <linux/platform_device.h>
1713 #include <linux/of_device.h>
14
+#include <linux/sched/signal.h>
15
+#include <linux/slab.h>
1816 #include <linux/vexpress.h>
1917 
18
+#define SYS_MISC		0x0
19
+#define SYS_MISC_MASTERSITE	(1 << 14)
20
+
21
+#define SYS_PROCID0		0x24
22
+#define SYS_PROCID1		0x28
23
+#define SYS_HBI_MASK		0xfff
24
+#define SYS_PROCIDx_HBI_SHIFT	0
25
+
26
+#define SYS_CFGDATA		0x40
27
+
28
+#define SYS_CFGCTRL		0x44
29
+#define SYS_CFGCTRL_START	(1 << 31)
30
+#define SYS_CFGCTRL_WRITE	(1 << 30)
31
+#define SYS_CFGCTRL_DCC(n)	(((n) & 0xf) << 26)
32
+#define SYS_CFGCTRL_FUNC(n)	(((n) & 0x3f) << 20)
33
+#define SYS_CFGCTRL_SITE(n)	(((n) & 0x3) << 16)
34
+#define SYS_CFGCTRL_POSITION(n)	(((n) & 0xf) << 12)
35
+#define SYS_CFGCTRL_DEVICE(n)	(((n) & 0xfff) << 0)
36
+
37
+#define SYS_CFGSTAT		0x48
38
+#define SYS_CFGSTAT_ERR		(1 << 1)
39
+#define SYS_CFGSTAT_COMPLETE	(1 << 0)
40
+
41
+#define VEXPRESS_SITE_MB		0
42
+#define VEXPRESS_SITE_DB1		1
43
+#define VEXPRESS_SITE_DB2		2
44
+#define VEXPRESS_SITE_MASTER		0xf
45
+
46
+struct vexpress_syscfg {
47
+	struct device *dev;
48
+	void __iomem *base;
49
+	struct list_head funcs;
50
+};
51
+
52
+struct vexpress_syscfg_func {
53
+	struct list_head list;
54
+	struct vexpress_syscfg *syscfg;
55
+	struct regmap *regmap;
56
+	int num_templates;
57
+	u32 template[]; /* Keep it last! */
58
+};
59
+
60
+struct vexpress_config_bridge_ops {
61
+	struct regmap * (*regmap_init)(struct device *dev, void *context);
62
+	void (*regmap_exit)(struct regmap *regmap, void *context);
63
+};
2064 
2165 struct vexpress_config_bridge {
2266 	struct vexpress_config_bridge_ops *ops;
....@@ -25,26 +69,20 @@
2569 
2670 
2771 static DEFINE_MUTEX(vexpress_config_mutex);
28
-static struct class *vexpress_config_class;
2972 static u32 vexpress_config_site_master = VEXPRESS_SITE_MASTER;
3073 
3174 
32
-void vexpress_config_set_master(u32 site)
75
+static void vexpress_config_set_master(u32 site)
3376 {
3477 	vexpress_config_site_master = site;
3578 }
3679 
37
-u32 vexpress_config_get_master(void)
38
-{
39
-	return vexpress_config_site_master;
40
-}
41
-
42
-void vexpress_config_lock(void *arg)
80
+static void vexpress_config_lock(void *arg)
4381 {
4482 	mutex_lock(&vexpress_config_mutex);
4583 }
4684 
47
-void vexpress_config_unlock(void *arg)
85
+static void vexpress_config_unlock(void *arg)
4886 {
4987 	mutex_unlock(&vexpress_config_mutex);
5088 }
....@@ -66,7 +104,7 @@
66104 	}
67105 }
68106 
69
-int vexpress_config_get_topo(struct device_node *node, u32 *site,
107
+static int vexpress_config_get_topo(struct device_node *node, u32 *site,
70108 		u32 *position, u32 *dcc)
71109 {
72110 	vexpress_config_find_prop(node, "arm,vexpress,site", site);
....@@ -95,9 +133,6 @@
95133 	struct regmap *regmap;
96134 	struct regmap **res;
97135 
98
-	if (WARN_ON(dev->parent->class != vexpress_config_class))
99
-		return ERR_PTR(-ENODEV);
100
-
101136 	bridge = dev_get_drvdata(dev->parent);
102137 	if (WARN_ON(!bridge))
103138 		return ERR_PTR(-EINVAL);
....@@ -120,91 +155,265 @@
120155 }
121156 EXPORT_SYMBOL_GPL(devm_regmap_init_vexpress_config);
122157 
123
-struct device *vexpress_config_bridge_register(struct device *parent,
124
-		struct vexpress_config_bridge_ops *ops, void *context)
158
+static int vexpress_syscfg_exec(struct vexpress_syscfg_func *func,
159
+		int index, bool write, u32 *data)
125160 {
126
-	struct device *dev;
127
-	struct vexpress_config_bridge *bridge;
161
+	struct vexpress_syscfg *syscfg = func->syscfg;
162
+	u32 command, status;
163
+	int tries;
164
+	long timeout;
128165 
129
-	if (!vexpress_config_class) {
130
-		vexpress_config_class = class_create(THIS_MODULE,
131
-				"vexpress-config");
132
-		if (IS_ERR(vexpress_config_class))
133
-			return (void *)vexpress_config_class;
134
-	}
135
-
136
-	dev = device_create(vexpress_config_class, parent, 0,
137
-			NULL, "%s.bridge", dev_name(parent));
138
-
139
-	if (IS_ERR(dev))
140
-		return dev;
141
-
142
-	bridge = devm_kmalloc(dev, sizeof(*bridge), GFP_KERNEL);
143
-	if (!bridge) {
144
-		put_device(dev);
145
-		device_unregister(dev);
146
-		return ERR_PTR(-ENOMEM);
147
-	}
148
-	bridge->ops = ops;
149
-	bridge->context = context;
150
-
151
-	dev_set_drvdata(dev, bridge);
152
-
153
-	dev_dbg(parent, "Registered bridge '%s', parent node %p\n",
154
-			dev_name(dev), parent->of_node);
155
-
156
-	return dev;
157
-}
158
-
159
-
160
-static int vexpress_config_node_match(struct device *dev, const void *data)
161
-{
162
-	const struct device_node *node = data;
163
-
164
-	dev_dbg(dev, "Parent node %p, looking for %p\n",
165
-			dev->parent->of_node, node);
166
-
167
-	return dev->parent->of_node == node;
168
-}
169
-
170
-static int vexpress_config_populate(struct device_node *node)
171
-{
172
-	struct device_node *bridge;
173
-	struct device *parent;
174
-	int ret;
175
-
176
-	bridge = of_parse_phandle(node, "arm,vexpress,config-bridge", 0);
177
-	if (!bridge)
166
+	if (WARN_ON(index >= func->num_templates))
178167 		return -EINVAL;
179168 
180
-	parent = class_find_device(vexpress_config_class, NULL, bridge,
181
-			vexpress_config_node_match);
182
-	of_node_put(bridge);
183
-	if (WARN_ON(!parent))
184
-		return -ENODEV;
169
+	command = readl(syscfg->base + SYS_CFGCTRL);
170
+	if (WARN_ON(command & SYS_CFGCTRL_START))
171
+		return -EBUSY;
185172 
186
-	ret = of_platform_populate(node, NULL, NULL, parent);
173
+	command = func->template[index];
174
+	command |= SYS_CFGCTRL_START;
175
+	command |= write ? SYS_CFGCTRL_WRITE : 0;
187176 
188
-	put_device(parent);
177
+	/* Use a canary for reads */
178
+	if (!write)
179
+		*data = 0xdeadbeef;
189180 
190
-	return ret;
181
+	dev_dbg(syscfg->dev, "func %p, command %x, data %x\n",
182
+			func, command, *data);
183
+	writel(*data, syscfg->base + SYS_CFGDATA);
184
+	writel(0, syscfg->base + SYS_CFGSTAT);
185
+	writel(command, syscfg->base + SYS_CFGCTRL);
186
+	mb();
187
+
188
+	/* The operation can take ages... Go to sleep, 100us initially */
189
+	tries = 100;
190
+	timeout = 100;
191
+	do {
192
+		if (!irqs_disabled()) {
193
+			set_current_state(TASK_INTERRUPTIBLE);
194
+			schedule_timeout(usecs_to_jiffies(timeout));
195
+			if (signal_pending(current))
196
+				return -EINTR;
197
+		} else {
198
+			udelay(timeout);
199
+		}
200
+
201
+		status = readl(syscfg->base + SYS_CFGSTAT);
202
+		if (status & SYS_CFGSTAT_ERR)
203
+			return -EFAULT;
204
+
205
+		if (timeout > 20)
206
+			timeout -= 20;
207
+	} while (--tries && !(status & SYS_CFGSTAT_COMPLETE));
208
+	if (WARN_ON_ONCE(!tries))
209
+		return -ETIMEDOUT;
210
+
211
+	if (!write) {
212
+		*data = readl(syscfg->base + SYS_CFGDATA);
213
+		dev_dbg(syscfg->dev, "func %p, read data %x\n", func, *data);
214
+	}
215
+
216
+	return 0;
191217 }
192218 
193
-static int __init vexpress_config_init(void)
219
+static int vexpress_syscfg_read(void *context, unsigned int index,
220
+		unsigned int *val)
194221 {
195
-	int err = 0;
196
-	struct device_node *node;
222
+	struct vexpress_syscfg_func *func = context;
197223 
198
-	/* Need the config devices early, before the "normal" devices... */
199
-	for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") {
200
-		err = vexpress_config_populate(node);
201
-		if (err) {
202
-			of_node_put(node);
224
+	return vexpress_syscfg_exec(func, index, false, val);
225
+}
226
+
227
+static int vexpress_syscfg_write(void *context, unsigned int index,
228
+		unsigned int val)
229
+{
230
+	struct vexpress_syscfg_func *func = context;
231
+
232
+	return vexpress_syscfg_exec(func, index, true, &val);
233
+}
234
+
235
+static struct regmap_config vexpress_syscfg_regmap_config = {
236
+	.lock = vexpress_config_lock,
237
+	.unlock = vexpress_config_unlock,
238
+	.reg_bits = 32,
239
+	.val_bits = 32,
240
+	.reg_read = vexpress_syscfg_read,
241
+	.reg_write = vexpress_syscfg_write,
242
+	.reg_format_endian = REGMAP_ENDIAN_LITTLE,
243
+	.val_format_endian = REGMAP_ENDIAN_LITTLE,
244
+};
245
+
246
+
247
+static struct regmap *vexpress_syscfg_regmap_init(struct device *dev,
248
+		void *context)
249
+{
250
+	int err;
251
+	struct vexpress_syscfg *syscfg = context;
252
+	struct vexpress_syscfg_func *func;
253
+	struct property *prop;
254
+	const __be32 *val = NULL;
255
+	__be32 energy_quirk[4];
256
+	int num;
257
+	u32 site, position, dcc;
258
+	int i;
259
+
260
+	err = vexpress_config_get_topo(dev->of_node, &site,
261
+				&position, &dcc);
262
+	if (err)
263
+		return ERR_PTR(err);
264
+
265
+	prop = of_find_property(dev->of_node,
266
+			"arm,vexpress-sysreg,func", NULL);
267
+	if (!prop)
268
+		return ERR_PTR(-EINVAL);
269
+
270
+	num = prop->length / sizeof(u32) / 2;
271
+	val = prop->value;
272
+
273
+	/*
274
+	 * "arm,vexpress-energy" function used to be described
275
+	 * by its first device only, now it requires both
276
+	 */
277
+	if (num == 1 && of_device_is_compatible(dev->of_node,
278
+			"arm,vexpress-energy")) {
279
+		num = 2;
280
+		energy_quirk[0] = *val;
281
+		energy_quirk[2] = *val++;
282
+		energy_quirk[1] = *val;
283
+		energy_quirk[3] = cpu_to_be32(be32_to_cpup(val) + 1);
284
+		val = energy_quirk;
285
+	}
286
+
287
+	func = kzalloc(struct_size(func, template, num), GFP_KERNEL);
288
+	if (!func)
289
+		return ERR_PTR(-ENOMEM);
290
+
291
+	func->syscfg = syscfg;
292
+	func->num_templates = num;
293
+
294
+	for (i = 0; i < num; i++) {
295
+		u32 function, device;
296
+
297
+		function = be32_to_cpup(val++);
298
+		device = be32_to_cpup(val++);
299
+
300
+		dev_dbg(dev, "func %p: %u/%u/%u/%u/%u\n",
301
+				func, site, position, dcc,
302
+				function, device);
303
+
304
+		func->template[i] = SYS_CFGCTRL_DCC(dcc);
305
+		func->template[i] |= SYS_CFGCTRL_SITE(site);
306
+		func->template[i] |= SYS_CFGCTRL_POSITION(position);
307
+		func->template[i] |= SYS_CFGCTRL_FUNC(function);
308
+		func->template[i] |= SYS_CFGCTRL_DEVICE(device);
309
+	}
310
+
311
+	vexpress_syscfg_regmap_config.max_register = num - 1;
312
+
313
+	func->regmap = regmap_init(dev, NULL, func,
314
+			&vexpress_syscfg_regmap_config);
315
+
316
+	if (IS_ERR(func->regmap)) {
317
+		void *err = func->regmap;
318
+
319
+		kfree(func);
320
+		return err;
321
+	}
322
+
323
+	list_add(&func->list, &syscfg->funcs);
324
+
325
+	return func->regmap;
326
+}
327
+
328
+static void vexpress_syscfg_regmap_exit(struct regmap *regmap, void *context)
329
+{
330
+	struct vexpress_syscfg *syscfg = context;
331
+	struct vexpress_syscfg_func *func, *tmp;
332
+
333
+	regmap_exit(regmap);
334
+
335
+	list_for_each_entry_safe(func, tmp, &syscfg->funcs, list) {
336
+		if (func->regmap == regmap) {
337
+			list_del(&syscfg->funcs);
338
+			kfree(func);
203339 			break;
204340 		}
205341 	}
206
-
207
-	return err;
208342 }
209
-postcore_initcall(vexpress_config_init);
210343 
344
+static struct vexpress_config_bridge_ops vexpress_syscfg_bridge_ops = {
345
+	.regmap_init = vexpress_syscfg_regmap_init,
346
+	.regmap_exit = vexpress_syscfg_regmap_exit,
347
+};
348
+
349
+
350
+static int vexpress_syscfg_probe(struct platform_device *pdev)
351
+{
352
+	struct vexpress_syscfg *syscfg;
353
+	struct resource *res;
354
+	struct vexpress_config_bridge *bridge;
355
+	struct device_node *node;
356
+	int master;
357
+	u32 dt_hbi;
358
+
359
+	syscfg = devm_kzalloc(&pdev->dev, sizeof(*syscfg), GFP_KERNEL);
360
+	if (!syscfg)
361
+		return -ENOMEM;
362
+	syscfg->dev = &pdev->dev;
363
+	INIT_LIST_HEAD(&syscfg->funcs);
364
+
365
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
366
+	syscfg->base = devm_ioremap_resource(&pdev->dev, res);
367
+	if (IS_ERR(syscfg->base))
368
+		return PTR_ERR(syscfg->base);
369
+
370
+	bridge = devm_kmalloc(&pdev->dev, sizeof(*bridge), GFP_KERNEL);
371
+	if (!bridge)
372
+		return -ENOMEM;
373
+
374
+	bridge->ops = &vexpress_syscfg_bridge_ops;
375
+	bridge->context = syscfg;
376
+
377
+	dev_set_drvdata(&pdev->dev, bridge);
378
+
379
+	master = readl(syscfg->base + SYS_MISC) & SYS_MISC_MASTERSITE ?
380
+			VEXPRESS_SITE_DB2 : VEXPRESS_SITE_DB1;
381
+	vexpress_config_set_master(master);
382
+
383
+	/* Confirm board type against DT property, if available */
384
+	if (of_property_read_u32(of_root, "arm,hbi", &dt_hbi) == 0) {
385
+		u32 id = readl(syscfg->base + (master == VEXPRESS_SITE_DB1 ?
386
+				 SYS_PROCID0 : SYS_PROCID1));
387
+		u32 hbi = (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;
388
+
389
+		if (WARN_ON(dt_hbi != hbi))
390
+			dev_warn(&pdev->dev, "DT HBI (%x) is not matching hardware (%x)!\n",
391
+					dt_hbi, hbi);
392
+	}
393
+
394
+	for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") {
395
+		struct device_node *bridge_np;
396
+
397
+		bridge_np = of_parse_phandle(node, "arm,vexpress,config-bridge", 0);
398
+		if (bridge_np != pdev->dev.parent->of_node)
399
+			continue;
400
+
401
+		of_platform_populate(node, NULL, NULL, &pdev->dev);
402
+	}
403
+
404
+	return 0;
405
+}
406
+
407
+static const struct platform_device_id vexpress_syscfg_id_table[] = {
408
+	{ "vexpress-syscfg", },
409
+	{},
410
+};
411
+MODULE_DEVICE_TABLE(platform, vexpress_syscfg_id_table);
412
+
413
+static struct platform_driver vexpress_syscfg_driver = {
414
+	.driver.name = "vexpress-syscfg",
415
+	.id_table = vexpress_syscfg_id_table,
416
+	.probe = vexpress_syscfg_probe,
417
+};
418
+module_platform_driver(vexpress_syscfg_driver);
419
+MODULE_LICENSE("GPL v2");