1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2019 NXP.
4 */
5
6 #include <linux/init.h>
7 #include <linux/io.h>
8 #include <linux/of_address.h>
9 #include <linux/slab.h>
10 #include <linux/sys_soc.h>
11 #include <linux/platform_device.h>
12 #include <linux/arm-smccc.h>
13 #include <linux/of.h>
14 #include <linux/clk.h>
15
16 #define REV_B1 0x21
17
18 #define IMX8MQ_SW_INFO_B1 0x40
19 #define IMX8MQ_SW_MAGIC_B1 0xff0055aa
20
21 #define IMX_SIP_GET_SOC_INFO 0xc2000006
22
23 #define OCOTP_UID_LOW 0x410
24 #define OCOTP_UID_HIGH 0x420
25
26 #define IMX8MP_OCOTP_UID_OFFSET 0x10
27
28 /* Same as ANADIG_DIGPROG_IMX7D */
29 #define ANADIG_DIGPROG_IMX8MM 0x800
30
31 struct imx8_soc_data {
32 char *name;
33 u32 (*soc_revision)(void);
34 };
35
36 static u64 soc_uid;
37
38 #ifdef CONFIG_HAVE_ARM_SMCCC
imx8mq_soc_revision_from_atf(void)39 static u32 imx8mq_soc_revision_from_atf(void)
40 {
41 struct arm_smccc_res res;
42
43 arm_smccc_smc(IMX_SIP_GET_SOC_INFO, 0, 0, 0, 0, 0, 0, 0, &res);
44
45 if (res.a0 == SMCCC_RET_NOT_SUPPORTED)
46 return 0;
47 else
48 return res.a0 & 0xff;
49 }
50 #else
imx8mq_soc_revision_from_atf(void)51 static inline u32 imx8mq_soc_revision_from_atf(void) { return 0; };
52 #endif
53
imx8mq_soc_revision(void)54 static u32 __init imx8mq_soc_revision(void)
55 {
56 struct device_node *np;
57 void __iomem *ocotp_base;
58 u32 magic;
59 u32 rev;
60 struct clk *clk;
61
62 np = of_find_compatible_node(NULL, NULL, "fsl,imx8mq-ocotp");
63 if (!np)
64 return 0;
65
66 ocotp_base = of_iomap(np, 0);
67 WARN_ON(!ocotp_base);
68 clk = of_clk_get_by_name(np, NULL);
69 if (IS_ERR(clk)) {
70 WARN_ON(IS_ERR(clk));
71 return 0;
72 }
73
74 clk_prepare_enable(clk);
75
76 /*
77 * SOC revision on older imx8mq is not available in fuses so query
78 * the value from ATF instead.
79 */
80 rev = imx8mq_soc_revision_from_atf();
81 if (!rev) {
82 magic = readl_relaxed(ocotp_base + IMX8MQ_SW_INFO_B1);
83 if (magic == IMX8MQ_SW_MAGIC_B1)
84 rev = REV_B1;
85 }
86
87 soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH);
88 soc_uid <<= 32;
89 soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW);
90
91 clk_disable_unprepare(clk);
92 clk_put(clk);
93 iounmap(ocotp_base);
94 of_node_put(np);
95
96 return rev;
97 }
98
imx8mm_soc_uid(void)99 static void __init imx8mm_soc_uid(void)
100 {
101 void __iomem *ocotp_base;
102 struct device_node *np;
103 struct clk *clk;
104 u32 offset = of_machine_is_compatible("fsl,imx8mp") ?
105 IMX8MP_OCOTP_UID_OFFSET : 0;
106
107 np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-ocotp");
108 if (!np)
109 return;
110
111 ocotp_base = of_iomap(np, 0);
112 WARN_ON(!ocotp_base);
113 clk = of_clk_get_by_name(np, NULL);
114 if (IS_ERR(clk)) {
115 WARN_ON(IS_ERR(clk));
116 return;
117 }
118
119 clk_prepare_enable(clk);
120
121 soc_uid = readl_relaxed(ocotp_base + OCOTP_UID_HIGH + offset);
122 soc_uid <<= 32;
123 soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW + offset);
124
125 clk_disable_unprepare(clk);
126 clk_put(clk);
127 iounmap(ocotp_base);
128 of_node_put(np);
129 }
130
imx8mm_soc_revision(void)131 static u32 __init imx8mm_soc_revision(void)
132 {
133 struct device_node *np;
134 void __iomem *anatop_base;
135 u32 rev;
136
137 np = of_find_compatible_node(NULL, NULL, "fsl,imx8mm-anatop");
138 if (!np)
139 return 0;
140
141 anatop_base = of_iomap(np, 0);
142 WARN_ON(!anatop_base);
143
144 rev = readl_relaxed(anatop_base + ANADIG_DIGPROG_IMX8MM);
145
146 iounmap(anatop_base);
147 of_node_put(np);
148
149 imx8mm_soc_uid();
150
151 return rev;
152 }
153
154 static const struct imx8_soc_data imx8mq_soc_data = {
155 .name = "i.MX8MQ",
156 .soc_revision = imx8mq_soc_revision,
157 };
158
159 static const struct imx8_soc_data imx8mm_soc_data = {
160 .name = "i.MX8MM",
161 .soc_revision = imx8mm_soc_revision,
162 };
163
164 static const struct imx8_soc_data imx8mn_soc_data = {
165 .name = "i.MX8MN",
166 .soc_revision = imx8mm_soc_revision,
167 };
168
169 static const struct imx8_soc_data imx8mp_soc_data = {
170 .name = "i.MX8MP",
171 .soc_revision = imx8mm_soc_revision,
172 };
173
174 static __maybe_unused const struct of_device_id imx8_soc_match[] = {
175 { .compatible = "fsl,imx8mq", .data = &imx8mq_soc_data, },
176 { .compatible = "fsl,imx8mm", .data = &imx8mm_soc_data, },
177 { .compatible = "fsl,imx8mn", .data = &imx8mn_soc_data, },
178 { .compatible = "fsl,imx8mp", .data = &imx8mp_soc_data, },
179 { }
180 };
181
182 #define imx8_revision(soc_rev) \
183 soc_rev ? \
184 kasprintf(GFP_KERNEL, "%d.%d", (soc_rev >> 4) & 0xf, soc_rev & 0xf) : \
185 "unknown"
186
imx8_soc_init(void)187 static int __init imx8_soc_init(void)
188 {
189 struct soc_device_attribute *soc_dev_attr;
190 struct soc_device *soc_dev;
191 const struct of_device_id *id;
192 u32 soc_rev = 0;
193 const struct imx8_soc_data *data;
194 int ret;
195
196 soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
197 if (!soc_dev_attr)
198 return -ENOMEM;
199
200 soc_dev_attr->family = "Freescale i.MX";
201
202 ret = of_property_read_string(of_root, "model", &soc_dev_attr->machine);
203 if (ret)
204 goto free_soc;
205
206 id = of_match_node(imx8_soc_match, of_root);
207 if (!id) {
208 ret = -ENODEV;
209 goto free_soc;
210 }
211
212 data = id->data;
213 if (data) {
214 soc_dev_attr->soc_id = data->name;
215 if (data->soc_revision)
216 soc_rev = data->soc_revision();
217 }
218
219 soc_dev_attr->revision = imx8_revision(soc_rev);
220 if (!soc_dev_attr->revision) {
221 ret = -ENOMEM;
222 goto free_soc;
223 }
224
225 soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
226 if (!soc_dev_attr->serial_number) {
227 ret = -ENOMEM;
228 goto free_rev;
229 }
230
231 soc_dev = soc_device_register(soc_dev_attr);
232 if (IS_ERR(soc_dev)) {
233 ret = PTR_ERR(soc_dev);
234 goto free_serial_number;
235 }
236
237 pr_info("SoC: %s revision %s\n", soc_dev_attr->soc_id,
238 soc_dev_attr->revision);
239
240 if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
241 platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
242
243 return 0;
244
245 free_serial_number:
246 kfree(soc_dev_attr->serial_number);
247 free_rev:
248 if (strcmp(soc_dev_attr->revision, "unknown"))
249 kfree(soc_dev_attr->revision);
250 free_soc:
251 kfree(soc_dev_attr);
252 return ret;
253 }
254 device_initcall(imx8_soc_init);
255 MODULE_LICENSE("GPL");
256