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2024-05-16 8d2a02b24d66aa359e83eebc1ed3c0f85367a1cb 
 kernel/drivers/nvmem/sunxi_sid.c
....@@ -1,18 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0+
12 /*
23  * Allwinner sunXi SoCs Security ID support.
34  *
45  * Copyright (c) 2013 Oliver Schinagl <oliver@schinagl.nl>
56  * Copyright (C) 2014 Maxime Ripard <maxime.ripard@free-electrons.com>
6
- *
7
- * This program is free software; you can redistribute it and/or modify
8
- * it under the terms of the GNU General Public License as published by
9
- * the Free Software Foundation; either version 2 of the License, or
10
- * (at your option) any later version.
11
- *
12
- * This program is distributed in the hope that it will be useful,
13
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
- * GNU General Public License for more details.
167  */
178 
189 #include <linux/device.h>
....@@ -35,13 +26,6 @@
3526 #define SUN8I_SID_OP_LOCK	(0xAC << 8)
3627 #define SUN8I_SID_READ		BIT(1)
3728 
38
-static struct nvmem_config econfig = {
39
-	.name = "sunxi-sid",
40
-	.read_only = true,
41
-	.stride = 4,
42
-	.word_size = 1,
43
-};
44
-
4529 struct sunxi_sid_cfg {
4630 	u32	value_offset;
4731 	u32	size;
....@@ -53,33 +37,12 @@
5337 	u32			value_offset;
5438 };
5539 
56
-/* We read the entire key, due to a 32 bit read alignment requirement. Since we
57
- * want to return the requested byte, this results in somewhat slower code and
58
- * uses 4 times more reads as needed but keeps code simpler. Since the SID is
59
- * only very rarely probed, this is not really an issue.
60
- */
61
-static u8 sunxi_sid_read_byte(const struct sunxi_sid *sid,
62
-			      const unsigned int offset)
63
-{
64
-	u32 sid_key;
65
-
66
-	sid_key = ioread32be(sid->base + round_down(offset, 4));
67
-	sid_key >>= (offset % 4) * 8;
68
-
69
-	return sid_key; /* Only return the last byte */
70
-}
71
-
7240 static int sunxi_sid_read(void *context, unsigned int offset,
7341 			  void *val, size_t bytes)
7442 {
7543 	struct sunxi_sid *sid = context;
76
-	u8 *buf = val;
7744 
78
-	/* Offset the read operation to the real position of SID */
79
-	offset += sid->value_offset;
80
-
81
-	while (bytes--)
82
-		*buf++ = sunxi_sid_read_byte(sid, offset++);
45
+	memcpy_fromio(val, sid->base + sid->value_offset + offset, bytes);
8346 
8447 	return 0;
8548 }
....@@ -115,35 +78,33 @@
11578  * to be not reliable at all.
11679  * Read by the registers instead.
11780  */
118
-static int sun8i_sid_read_byte_by_reg(const struct sunxi_sid *sid,
119
-				      const unsigned int offset,
120
-				      u8 *out)
121
-{
122
-	u32 word;
123
-	int ret;
124
-
125
-	ret = sun8i_sid_register_readout(sid, offset & ~0x03, &word);
126
-
127
-	if (ret)
128
-		return ret;
129
-
130
-	*out = (word >> ((offset & 0x3) * 8)) & 0xff;
131
-
132
-	return 0;
133
-}
134
-
13581 static int sun8i_sid_read_by_reg(void *context, unsigned int offset,
13682 				 void *val, size_t bytes)
13783 {
13884 	struct sunxi_sid *sid = context;
139
-	u8 *buf = val;
85
+	u32 word;
14086 	int ret;
14187 
142
-	while (bytes--) {
143
-		ret = sun8i_sid_read_byte_by_reg(sid, offset++, buf++);
88
+	/* .stride = 4 so offset is guaranteed to be aligned */
89
+	while (bytes >= 4) {
90
+		ret = sun8i_sid_register_readout(sid, offset, val);
14491 		if (ret)
14592 			return ret;
93
+
94
+		val += 4;
95
+		offset += 4;
96
+		bytes -= 4;
14697 	}
98
+
99
+	if (!bytes)
100
+		return 0;
101
+
102
+	/* Handle any trailing bytes */
103
+	ret = sun8i_sid_register_readout(sid, offset, &word);
104
+	if (ret)
105
+		return ret;
106
+
107
+	memcpy(val, &word, bytes);
147108 
148109 	return 0;
149110 }
....@@ -152,9 +113,10 @@
152113 {
153114 	struct device *dev = &pdev->dev;
154115 	struct resource *res;
116
+	struct nvmem_config *nvmem_cfg;
155117 	struct nvmem_device *nvmem;
156118 	struct sunxi_sid *sid;
157
-	int ret, i, size;
119
+	int size;
158120 	char *randomness;
159121 	const struct sunxi_sid_cfg *cfg;
160122 
....@@ -174,43 +136,37 @@
174136 
175137 	size = cfg->size;
176138 
177
-	econfig.size = size;
178
-	econfig.dev = dev;
139
+	nvmem_cfg = devm_kzalloc(dev, sizeof(*nvmem_cfg), GFP_KERNEL);
140
+	if (!nvmem_cfg)
141
+		return -ENOMEM;
142
+
143
+	nvmem_cfg->dev = dev;
144
+	nvmem_cfg->name = "sunxi-sid";
145
+	nvmem_cfg->read_only = true;
146
+	nvmem_cfg->size = cfg->size;
147
+	nvmem_cfg->word_size = 1;
148
+	nvmem_cfg->stride = 4;
149
+	nvmem_cfg->priv = sid;
179150 	if (cfg->need_register_readout)
180
-		econfig.reg_read = sun8i_sid_read_by_reg;
151
+		nvmem_cfg->reg_read = sun8i_sid_read_by_reg;
181152 	else
182
-		econfig.reg_read = sunxi_sid_read;
183
-	econfig.priv = sid;
184
-	nvmem = nvmem_register(&econfig);
153
+		nvmem_cfg->reg_read = sunxi_sid_read;
154
+
155
+	nvmem = devm_nvmem_register(dev, nvmem_cfg);
185156 	if (IS_ERR(nvmem))
186157 		return PTR_ERR(nvmem);
187158 
188159 	randomness = kzalloc(size, GFP_KERNEL);
189
-	if (!randomness) {
190
-		ret = -EINVAL;
191
-		goto err_unreg_nvmem;
192
-	}
160
+	if (!randomness)
161
+		return -ENOMEM;
193162 
194
-	for (i = 0; i < size; i++)
195
-		econfig.reg_read(sid, i, &randomness[i], 1);
196
-
163
+	nvmem_cfg->reg_read(sid, 0, randomness, size);
197164 	add_device_randomness(randomness, size);
198165 	kfree(randomness);
199166 
200167 	platform_set_drvdata(pdev, nvmem);
201168 
202169 	return 0;
203
-
204
-err_unreg_nvmem:
205
-	nvmem_unregister(nvmem);
206
-	return ret;
207
-}
208
-
209
-static int sunxi_sid_remove(struct platform_device *pdev)
210
-{
211
-	struct nvmem_device *nvmem = platform_get_drvdata(pdev);
212
-
213
-	return nvmem_unregister(nvmem);
214170 }
215171 
216172 static const struct sunxi_sid_cfg sun4i_a10_cfg = {
....@@ -230,6 +186,12 @@
230186 static const struct sunxi_sid_cfg sun50i_a64_cfg = {
231187 	.value_offset = 0x200,
232188 	.size = 0x100,
189
+	.need_register_readout = true,
190
+};
191
+
192
+static const struct sunxi_sid_cfg sun50i_h6_cfg = {
193
+	.value_offset = 0x200,
194
+	.size = 0x200,
233195 };
234196 
235197 static const struct of_device_id sunxi_sid_of_match[] = {
....@@ -239,13 +201,13 @@
239201 	{ .compatible = "allwinner,sun8i-h3-sid", .data = &sun8i_h3_cfg },
240202 	{ .compatible = "allwinner,sun50i-a64-sid", .data = &sun50i_a64_cfg },
241203 	{ .compatible = "allwinner,sun50i-h5-sid", .data = &sun50i_a64_cfg },
204
+	{ .compatible = "allwinner,sun50i-h6-sid", .data = &sun50i_h6_cfg },
242205 	{/* sentinel */},
243206 };
244207 MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);
245208 
246209 static struct platform_driver sunxi_sid_driver = {
247210 	.probe = sunxi_sid_probe,
248
-	.remove = sunxi_sid_remove,
249211 	.driver = {
250212 		.name = "eeprom-sunxi-sid",
251213 		.of_match_table = sunxi_sid_of_match,