1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright 2019 NXP.
4  */
5 
6 #include <dt-bindings/firmware/imx/rsrc.h>
7 #include <linux/firmware/imx/sci.h>
8 #include <linux/slab.h>
9 #include <linux/sys_soc.h>
10 #include <linux/platform_device.h>
11 #include <linux/of.h>
12 
13 static struct imx_sc_ipc *imx_sc_soc_ipc_handle;
14 
15 struct imx_sc_msg_misc_get_soc_id {
16 	struct imx_sc_rpc_msg hdr;
17 	union {
18 		struct {
19 			u32 control;
20 			u16 resource;
21 		} __packed req;
22 		struct {
23 			u32 id;
24 		} resp;
25 	} data;
26 } __packed __aligned(4);
27 
28 struct imx_sc_msg_misc_get_soc_uid {
29 	struct imx_sc_rpc_msg hdr;
30 	u32 uid_low;
31 	u32 uid_high;
32 } __packed;
33 
34 static int imx_scu_soc_uid(u64 *soc_uid)
35 {
36 	struct imx_sc_msg_misc_get_soc_uid msg;
37 	struct imx_sc_rpc_msg *hdr = &msg.hdr;
38 	int ret;
39 
40 	hdr->ver = IMX_SC_RPC_VERSION;
41 	hdr->svc = IMX_SC_RPC_SVC_MISC;
42 	hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
43 	hdr->size = 1;
44 
45 	ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
46 	if (ret) {
47 		pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
48 		return ret;
49 	}
50 
51 	*soc_uid = msg.uid_high;
52 	*soc_uid <<= 32;
53 	*soc_uid |= msg.uid_low;
54 
55 	return 0;
56 }
57 
58 static int imx_scu_soc_id(void)
59 {
60 	struct imx_sc_msg_misc_get_soc_id msg;
61 	struct imx_sc_rpc_msg *hdr = &msg.hdr;
62 	int ret;
63 
64 	hdr->ver = IMX_SC_RPC_VERSION;
65 	hdr->svc = IMX_SC_RPC_SVC_MISC;
66 	hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
67 	hdr->size = 3;
68 
69 	msg.data.req.control = IMX_SC_C_ID;
70 	msg.data.req.resource = IMX_SC_R_SYSTEM;
71 
72 	ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
73 	if (ret) {
74 		pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
75 		return ret;
76 	}
77 
78 	return msg.data.resp.id;
79 }
80 
81 int imx_scu_soc_init(struct device *dev)
82 {
83 	struct soc_device_attribute *soc_dev_attr;
84 	struct soc_device *soc_dev;
85 	int id, ret;
86 	u64 uid = 0;
87 	u32 val;
88 
89 	ret = imx_scu_get_handle(&imx_sc_soc_ipc_handle);
90 	if (ret)
91 		return ret;
92 
93 	soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr),
94 				    GFP_KERNEL);
95 	if (!soc_dev_attr)
96 		return -ENOMEM;
97 
98 	soc_dev_attr->family = "Freescale i.MX";
99 
100 	ret = of_property_read_string(of_root,
101 				      "model",
102 				      &soc_dev_attr->machine);
103 	if (ret)
104 		return ret;
105 
106 	id = imx_scu_soc_id();
107 	if (id < 0)
108 		return -EINVAL;
109 
110 	ret = imx_scu_soc_uid(&uid);
111 	if (ret < 0)
112 		return -EINVAL;
113 
114 	/* format soc_id value passed from SCU firmware */
115 	val = id & 0x1f;
116 	soc_dev_attr->soc_id = devm_kasprintf(dev, GFP_KERNEL, "0x%x", val);
117 	if (!soc_dev_attr->soc_id)
118 		return -ENOMEM;
119 
120 	/* format revision value passed from SCU firmware */
121 	val = (id >> 5) & 0xf;
122 	val = (((val >> 2) + 1) << 4) | (val & 0x3);
123 	soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
124 						(val >> 4) & 0xf, val & 0xf);
125 	if (!soc_dev_attr->revision)
126 		return -ENOMEM;
127 
128 	soc_dev_attr->serial_number = devm_kasprintf(dev, GFP_KERNEL,
129 						     "%016llX", uid);
130 	if (!soc_dev_attr->serial_number)
131 		return -ENOMEM;
132 
133 	soc_dev = soc_device_register(soc_dev_attr);
134 	if (IS_ERR(soc_dev))
135 		return PTR_ERR(soc_dev);
136 
137 	return 0;
138 }
139