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2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d 
 kernel/drivers/firmware/google/coreboot_table.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * coreboot_table.c
34  *
....@@ -5,31 +6,23 @@
56  *
67  * Copyright 2017 Google Inc.
78  * Copyright 2017 Samuel Holland <samuel@sholland.org>
8
- *
9
- * This program is free software; you can redistribute it and/or modify
10
- * it under the terms of the GNU General Public License v2.0 as published by
11
- * the Free Software Foundation.
12
- *
13
- * This program is distributed in the hope that it will be useful,
14
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
179  */
1810 
11
+#include <linux/acpi.h>
1912 #include <linux/device.h>
2013 #include <linux/err.h>
2114 #include <linux/init.h>
2215 #include <linux/io.h>
2316 #include <linux/kernel.h>
2417 #include <linux/module.h>
18
+#include <linux/of.h>
19
+#include <linux/platform_device.h>
2520 #include <linux/slab.h>
2621 
2722 #include "coreboot_table.h"
2823 
2924 #define CB_DEV(d) container_of(d, struct coreboot_device, dev)
3025 #define CB_DRV(d) container_of(d, struct coreboot_driver, drv)
31
-
32
-static struct coreboot_table_header __iomem *ptr_header;
3326 
3427 static int coreboot_bus_match(struct device *dev, struct device_driver *drv)
3528 {
....@@ -70,12 +63,6 @@
7063 	.remove		= coreboot_bus_remove,
7164 };
7265 
73
-static int __init coreboot_bus_init(void)
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-{
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-	return bus_register(&coreboot_bus_type);
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-}
77
-module_init(coreboot_bus_init);
78
-
7966 static void coreboot_device_release(struct device *dev)
8067 {
8168 	struct coreboot_device *device = CB_DEV(dev);
....@@ -97,63 +84,145 @@
9784 }
9885 EXPORT_SYMBOL(coreboot_driver_unregister);
9986 
100
-int coreboot_table_init(struct device *dev, void __iomem *ptr)
87
+static int coreboot_table_populate(struct device *dev, void *ptr)
10188 {
10289 	int i, ret;
10390 	void *ptr_entry;
10491 	struct coreboot_device *device;
105
-	struct coreboot_table_entry entry;
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-	struct coreboot_table_header header;
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+	struct coreboot_table_entry *entry;
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+	struct coreboot_table_header *header = ptr;
10794 
108
-	ptr_header = ptr;
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-	memcpy_fromio(&header, ptr_header, sizeof(header));
95
+	ptr_entry = ptr + header->header_bytes;
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+	for (i = 0; i < header->table_entries; i++) {
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+		entry = ptr_entry;
11098 
111
-	if (strncmp(header.signature, "LBIO", sizeof(header.signature))) {
112
-		pr_warn("coreboot_table: coreboot table missing or corrupt!\n");
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-		ret = -ENODEV;
114
-		goto out;
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-	}
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-
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-	ptr_entry = (void *)ptr_header + header.header_bytes;
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-	for (i = 0; i < header.table_entries; i++) {
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-		memcpy_fromio(&entry, ptr_entry, sizeof(entry));
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-
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-		device = kzalloc(sizeof(struct device) + entry.size, GFP_KERNEL);
122
-		if (!device) {
123
-			ret = -ENOMEM;
124
-			break;
125
-		}
99
+		device = kzalloc(sizeof(struct device) + entry->size, GFP_KERNEL);
100
+		if (!device)
101
+			return -ENOMEM;
126102 
127103 		dev_set_name(&device->dev, "coreboot%d", i);
128104 		device->dev.parent = dev;
129105 		device->dev.bus = &coreboot_bus_type;
130106 		device->dev.release = coreboot_device_release;
131
-		memcpy_fromio(&device->entry, ptr_entry, entry.size);
107
+		memcpy(&device->entry, ptr_entry, entry->size);
132108 
133109 		ret = device_register(&device->dev);
134110 		if (ret) {
135111 			put_device(&device->dev);
136
-			break;
112
+			return ret;
137113 		}
138114 
139
-		ptr_entry += entry.size;
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-	}
141
-out:
142
-	iounmap(ptr);
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-	return ret;
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-}
145
-EXPORT_SYMBOL(coreboot_table_init);
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-
147
-int coreboot_table_exit(void)
148
-{
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-	if (ptr_header) {
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-		bus_unregister(&coreboot_bus_type);
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-		ptr_header = NULL;
115
+		ptr_entry += entry->size;
152116 	}
153117 
154118 	return 0;
155119 }
156
-EXPORT_SYMBOL(coreboot_table_exit);
120
+
121
+static int coreboot_table_probe(struct platform_device *pdev)
122
+{
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+	resource_size_t len;
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+	struct coreboot_table_header *header;
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+	struct resource *res;
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+	struct device *dev = &pdev->dev;
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+	void *ptr;
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+	int ret;
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+
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+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+	if (!res)
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+		return -EINVAL;
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+
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+	len = resource_size(res);
135
+	if (!res->start || !len)
136
+		return -EINVAL;
137
+
138
+	/* Check just the header first to make sure things are sane */
139
+	header = memremap(res->start, sizeof(*header), MEMREMAP_WB);
140
+	if (!header)
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+		return -ENOMEM;
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+
143
+	len = header->header_bytes + header->table_bytes;
144
+	ret = strncmp(header->signature, "LBIO", sizeof(header->signature));
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+	memunmap(header);
146
+	if (ret) {
147
+		dev_warn(dev, "coreboot table missing or corrupt!\n");
148
+		return -ENODEV;
149
+	}
150
+
151
+	ptr = memremap(res->start, len, MEMREMAP_WB);
152
+	if (!ptr)
153
+		return -ENOMEM;
154
+
155
+	ret = coreboot_table_populate(dev, ptr);
156
+
157
+	memunmap(ptr);
158
+
159
+	return ret;
160
+}
161
+
162
+static int __cb_dev_unregister(struct device *dev, void *dummy)
163
+{
164
+	device_unregister(dev);
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+	return 0;
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+}
167
+
168
+static int coreboot_table_remove(struct platform_device *pdev)
169
+{
170
+	bus_for_each_dev(&coreboot_bus_type, NULL, NULL, __cb_dev_unregister);
171
+	return 0;
172
+}
173
+
174
+#ifdef CONFIG_ACPI
175
+static const struct acpi_device_id cros_coreboot_acpi_match[] = {
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+	{ "GOOGCB00", 0 },
177
+	{ "BOOT0000", 0 },
178
+	{ }
179
+};
180
+MODULE_DEVICE_TABLE(acpi, cros_coreboot_acpi_match);
181
+#endif
182
+
183
+#ifdef CONFIG_OF
184
+static const struct of_device_id coreboot_of_match[] = {
185
+	{ .compatible = "coreboot" },
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+	{}
187
+};
188
+MODULE_DEVICE_TABLE(of, coreboot_of_match);
189
+#endif
190
+
191
+static struct platform_driver coreboot_table_driver = {
192
+	.probe = coreboot_table_probe,
193
+	.remove = coreboot_table_remove,
194
+	.driver = {
195
+		.name = "coreboot_table",
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+		.acpi_match_table = ACPI_PTR(cros_coreboot_acpi_match),
197
+		.of_match_table = of_match_ptr(coreboot_of_match),
198
+	},
199
+};
200
+
201
+static int __init coreboot_table_driver_init(void)
202
+{
203
+	int ret;
204
+
205
+	ret = bus_register(&coreboot_bus_type);
206
+	if (ret)
207
+		return ret;
208
+
209
+	ret = platform_driver_register(&coreboot_table_driver);
210
+	if (ret) {
211
+		bus_unregister(&coreboot_bus_type);
212
+		return ret;
213
+	}
214
+
215
+	return 0;
216
+}
217
+
218
+static void __exit coreboot_table_driver_exit(void)
219
+{
220
+	platform_driver_unregister(&coreboot_table_driver);
221
+	bus_unregister(&coreboot_bus_type);
222
+}
223
+
224
+module_init(coreboot_table_driver_init);
225
+module_exit(coreboot_table_driver_exit);
157226 
158227 MODULE_AUTHOR("Google, Inc.");
159228 MODULE_LICENSE("GPL");