summaryrefslogtreecommitdiffstats
path: root/drivers/firmware/imx/imx-scu-soc.c
blob: 2f32353de2c9cb3b6d1cbbfd6318d2071943128c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2019 NXP.
 */

#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/firmware/imx/sci.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/platform_device.h>
#include <linux/of.h>

static struct imx_sc_ipc *imx_sc_soc_ipc_handle;

struct imx_sc_msg_misc_get_soc_id {
	struct imx_sc_rpc_msg hdr;
	union {
		struct {
			u32 control;
			u16 resource;
		} __packed req;
		struct {
			u32 id;
		} resp;
	} data;
} __packed __aligned(4);

struct imx_sc_msg_misc_get_soc_uid {
	struct imx_sc_rpc_msg hdr;
	u32 uid_low;
	u32 uid_high;
} __packed;

static int imx_scu_soc_uid(u64 *soc_uid)
{
	struct imx_sc_msg_misc_get_soc_uid msg;
	struct imx_sc_rpc_msg *hdr = &msg.hdr;
	int ret;

	hdr->ver = IMX_SC_RPC_VERSION;
	hdr->svc = IMX_SC_RPC_SVC_MISC;
	hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
	hdr->size = 1;

	ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
	if (ret) {
		pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
		return ret;
	}

	*soc_uid = msg.uid_high;
	*soc_uid <<= 32;
	*soc_uid |= msg.uid_low;

	return 0;
}

static int imx_scu_soc_id(void)
{
	struct imx_sc_msg_misc_get_soc_id msg;
	struct imx_sc_rpc_msg *hdr = &msg.hdr;
	int ret;

	hdr->ver = IMX_SC_RPC_VERSION;
	hdr->svc = IMX_SC_RPC_SVC_MISC;
	hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
	hdr->size = 3;

	msg.data.req.control = IMX_SC_C_ID;
	msg.data.req.resource = IMX_SC_R_SYSTEM;

	ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
	if (ret) {
		pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
		return ret;
	}

	return msg.data.resp.id;
}

int imx_scu_soc_init(struct device *dev)
{
	struct soc_device_attribute *soc_dev_attr;
	struct soc_device *soc_dev;
	int id, ret;
	u64 uid = 0;
	u32 val;

	ret = imx_scu_get_handle(&imx_sc_soc_ipc_handle);
	if (ret)
		return ret;

	soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr),
				    GFP_KERNEL);
	if (!soc_dev_attr)
		return -ENOMEM;

	soc_dev_attr->family = "Freescale i.MX";

	ret = of_property_read_string(of_root,
				      "model",
				      &soc_dev_attr->machine);
	if (ret)
		return ret;

	id = imx_scu_soc_id();
	if (id < 0)
		return -EINVAL;

	ret = imx_scu_soc_uid(&uid);
	if (ret < 0)
		return -EINVAL;

	/* format soc_id value passed from SCU firmware */
	val = id & 0x1f;
	soc_dev_attr->soc_id = devm_kasprintf(dev, GFP_KERNEL, "0x%x", val);
	if (!soc_dev_attr->soc_id)
		return -ENOMEM;

	/* format revision value passed from SCU firmware */
	val = (id >> 5) & 0xf;
	val = (((val >> 2) + 1) << 4) | (val & 0x3);
	soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
						(val >> 4) & 0xf, val & 0xf);
	if (!soc_dev_attr->revision)
		return -ENOMEM;

	soc_dev_attr->serial_number = devm_kasprintf(dev, GFP_KERNEL,
						     "%016llX", uid);
	if (!soc_dev_attr->serial_number)
		return -ENOMEM;

	soc_dev = soc_device_register(soc_dev_attr);
	if (IS_ERR(soc_dev))
		return PTR_ERR(soc_dev);

	return 0;
}