xref: /openbmc/linux/drivers/soc/imx/soc-imx.c (revision 8dd3cdea)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright 2020 NXP
4  */
5 
6 #include <linux/mfd/syscon.h>
7 #include <linux/of.h>
8 #include <linux/of_address.h>
9 #include <linux/regmap.h>
10 #include <linux/slab.h>
11 #include <linux/sys_soc.h>
12 
13 #include <soc/imx/cpu.h>
14 #include <soc/imx/revision.h>
15 
16 #define IIM_UID		0x820
17 
18 #define OCOTP_UID_H	0x420
19 #define OCOTP_UID_L	0x410
20 
21 #define OCOTP_ULP_UID_1		0x4b0
22 #define OCOTP_ULP_UID_2		0x4c0
23 #define OCOTP_ULP_UID_3		0x4d0
24 #define OCOTP_ULP_UID_4		0x4e0
25 
26 static int __init imx_soc_device_init(void)
27 {
28 	struct soc_device_attribute *soc_dev_attr;
29 	const char *ocotp_compat = NULL;
30 	struct soc_device *soc_dev;
31 	struct device_node *root;
32 	struct regmap *ocotp = NULL;
33 	const char *soc_id;
34 	u64 soc_uid = 0;
35 	u32 val;
36 	int ret;
37 	int i;
38 
39 	/* Return early if this is running on devices with different SoCs */
40 	if (!__mxc_cpu_type)
41 		return 0;
42 
43 	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
44 	if (!soc_dev_attr)
45 		return -ENOMEM;
46 
47 	soc_dev_attr->family = "Freescale i.MX";
48 
49 	root = of_find_node_by_path("/");
50 	ret = of_property_read_string(root, "model", &soc_dev_attr->machine);
51 	of_node_put(root);
52 	if (ret)
53 		goto free_soc;
54 
55 	switch (__mxc_cpu_type) {
56 	case MXC_CPU_MX1:
57 		soc_id = "i.MX1";
58 		break;
59 	case MXC_CPU_MX21:
60 		soc_id = "i.MX21";
61 		break;
62 	case MXC_CPU_MX25:
63 		soc_id = "i.MX25";
64 		break;
65 	case MXC_CPU_MX27:
66 		soc_id = "i.MX27";
67 		break;
68 	case MXC_CPU_MX31:
69 		soc_id = "i.MX31";
70 		break;
71 	case MXC_CPU_MX35:
72 		soc_id = "i.MX35";
73 		break;
74 	case MXC_CPU_MX50:
75 		soc_id = "i.MX50";
76 		break;
77 	case MXC_CPU_MX51:
78 		ocotp_compat = "fsl,imx51-iim";
79 		soc_id = "i.MX51";
80 		break;
81 	case MXC_CPU_MX53:
82 		ocotp_compat = "fsl,imx53-iim";
83 		soc_id = "i.MX53";
84 		break;
85 	case MXC_CPU_IMX6SL:
86 		ocotp_compat = "fsl,imx6sl-ocotp";
87 		soc_id = "i.MX6SL";
88 		break;
89 	case MXC_CPU_IMX6DL:
90 		ocotp_compat = "fsl,imx6q-ocotp";
91 		soc_id = "i.MX6DL";
92 		break;
93 	case MXC_CPU_IMX6SX:
94 		ocotp_compat = "fsl,imx6sx-ocotp";
95 		soc_id = "i.MX6SX";
96 		break;
97 	case MXC_CPU_IMX6Q:
98 		ocotp_compat = "fsl,imx6q-ocotp";
99 		soc_id = "i.MX6Q";
100 		break;
101 	case MXC_CPU_IMX6UL:
102 		ocotp_compat = "fsl,imx6ul-ocotp";
103 		soc_id = "i.MX6UL";
104 		break;
105 	case MXC_CPU_IMX6ULL:
106 		ocotp_compat = "fsl,imx6ull-ocotp";
107 		soc_id = "i.MX6ULL";
108 		break;
109 	case MXC_CPU_IMX6ULZ:
110 		ocotp_compat = "fsl,imx6ull-ocotp";
111 		soc_id = "i.MX6ULZ";
112 		break;
113 	case MXC_CPU_IMX6SLL:
114 		ocotp_compat = "fsl,imx6sll-ocotp";
115 		soc_id = "i.MX6SLL";
116 		break;
117 	case MXC_CPU_IMX7D:
118 		ocotp_compat = "fsl,imx7d-ocotp";
119 		soc_id = "i.MX7D";
120 		break;
121 	case MXC_CPU_IMX7ULP:
122 		ocotp_compat = "fsl,imx7ulp-ocotp";
123 		soc_id = "i.MX7ULP";
124 		break;
125 	case MXC_CPU_VF500:
126 		ocotp_compat = "fsl,vf610-ocotp";
127 		soc_id = "VF500";
128 		break;
129 	case MXC_CPU_VF510:
130 		ocotp_compat = "fsl,vf610-ocotp";
131 		soc_id = "VF510";
132 		break;
133 	case MXC_CPU_VF600:
134 		ocotp_compat = "fsl,vf610-ocotp";
135 		soc_id = "VF600";
136 		break;
137 	case MXC_CPU_VF610:
138 		ocotp_compat = "fsl,vf610-ocotp";
139 		soc_id = "VF610";
140 		break;
141 	default:
142 		soc_id = "Unknown";
143 	}
144 	soc_dev_attr->soc_id = soc_id;
145 
146 	if (ocotp_compat) {
147 		ocotp = syscon_regmap_lookup_by_compatible(ocotp_compat);
148 		if (IS_ERR(ocotp))
149 			pr_err("%s: failed to find %s regmap!\n", __func__, ocotp_compat);
150 	}
151 
152 	if (!IS_ERR_OR_NULL(ocotp)) {
153 		if (__mxc_cpu_type == MXC_CPU_IMX7ULP) {
154 			regmap_read(ocotp, OCOTP_ULP_UID_4, &val);
155 			soc_uid = val & 0xffff;
156 			regmap_read(ocotp, OCOTP_ULP_UID_3, &val);
157 			soc_uid <<= 16;
158 			soc_uid |= val & 0xffff;
159 			regmap_read(ocotp, OCOTP_ULP_UID_2, &val);
160 			soc_uid <<= 16;
161 			soc_uid |= val & 0xffff;
162 			regmap_read(ocotp, OCOTP_ULP_UID_1, &val);
163 			soc_uid <<= 16;
164 			soc_uid |= val & 0xffff;
165 		} else if (__mxc_cpu_type == MXC_CPU_MX51 ||
166 			   __mxc_cpu_type == MXC_CPU_MX53) {
167 			for (i=0; i < 8; i++) {
168 				regmap_read(ocotp, IIM_UID + i*4, &val);
169 				soc_uid <<= 8;
170 				soc_uid |= (val & 0xff);
171 			}
172 		} else {
173 			regmap_read(ocotp, OCOTP_UID_H, &val);
174 			soc_uid = val;
175 			regmap_read(ocotp, OCOTP_UID_L, &val);
176 			soc_uid <<= 32;
177 			soc_uid |= val;
178 		}
179 	}
180 
181 	soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d.%d",
182 					   (imx_get_soc_revision() >> 4) & 0xf,
183 					   imx_get_soc_revision() & 0xf);
184 	if (!soc_dev_attr->revision) {
185 		ret = -ENOMEM;
186 		goto free_soc;
187 	}
188 
189 	soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
190 	if (!soc_dev_attr->serial_number) {
191 		ret = -ENOMEM;
192 		goto free_rev;
193 	}
194 
195 	soc_dev = soc_device_register(soc_dev_attr);
196 	if (IS_ERR(soc_dev)) {
197 		ret = PTR_ERR(soc_dev);
198 		goto free_serial_number;
199 	}
200 
201 	return 0;
202 
203 free_serial_number:
204 	kfree(soc_dev_attr->serial_number);
205 free_rev:
206 	kfree(soc_dev_attr->revision);
207 free_soc:
208 	kfree(soc_dev_attr);
209 	return ret;
210 }
211 device_initcall(imx_soc_device_init);
212