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
13static struct imx_sc_ipc *imx_sc_soc_ipc_handle;
14
15struct 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
28struct 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
34static 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
58static 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
81static const char *imx_scu_soc_name(u32 id)
82{
83	switch (id) {
84	case 0x1:
85		return "i.MX8QM";
86	case 0x2:
87		return "i.MX8QXP";
88	case 0xe:
89		return "i.MX8DXL";
90	default:
91		break;
92	}
93
94	return "NULL";
95}
96
97int imx_scu_soc_init(struct device *dev)
98{
99	struct soc_device_attribute *soc_dev_attr;
100	struct soc_device *soc_dev;
101	int id, ret;
102	u64 uid = 0;
103	u32 val;
104
105	ret = imx_scu_get_handle(&imx_sc_soc_ipc_handle);
106	if (ret)
107		return ret;
108
109	soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr),
110				    GFP_KERNEL);
111	if (!soc_dev_attr)
112		return -ENOMEM;
113
114	soc_dev_attr->family = "Freescale i.MX";
115
116	ret = of_property_read_string(of_root,
117				      "model",
118				      &soc_dev_attr->machine);
119	if (ret)
120		return ret;
121
122	id = imx_scu_soc_id();
123	if (id < 0)
124		return -EINVAL;
125
126	ret = imx_scu_soc_uid(&uid);
127	if (ret < 0)
128		return -EINVAL;
129
130	/* format soc_id value passed from SCU firmware */
131	val = id & 0x1f;
132	soc_dev_attr->soc_id = imx_scu_soc_name(val);
133
134	/* format revision value passed from SCU firmware */
135	val = (id >> 5) & 0xf;
136	val = (((val >> 2) + 1) << 4) | (val & 0x3);
137	soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
138						(val >> 4) & 0xf, val & 0xf);
139	if (!soc_dev_attr->revision)
140		return -ENOMEM;
141
142	soc_dev_attr->serial_number = devm_kasprintf(dev, GFP_KERNEL,
143						     "%016llX", uid);
144	if (!soc_dev_attr->serial_number)
145		return -ENOMEM;
146
147	soc_dev = soc_device_register(soc_dev_attr);
148	if (IS_ERR(soc_dev))
149		return PTR_ERR(soc_dev);
150
151	return 0;
152}
153