1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2019 NXP.
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <dt-bindings/firmware/imx/rsrc.h>
7*4882a593Smuzhiyun #include <linux/firmware/imx/sci.h>
8*4882a593Smuzhiyun #include <linux/slab.h>
9*4882a593Smuzhiyun #include <linux/sys_soc.h>
10*4882a593Smuzhiyun #include <linux/platform_device.h>
11*4882a593Smuzhiyun #include <linux/of.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun static struct imx_sc_ipc *imx_sc_soc_ipc_handle;
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun struct imx_sc_msg_misc_get_soc_id {
16*4882a593Smuzhiyun struct imx_sc_rpc_msg hdr;
17*4882a593Smuzhiyun union {
18*4882a593Smuzhiyun struct {
19*4882a593Smuzhiyun u32 control;
20*4882a593Smuzhiyun u16 resource;
21*4882a593Smuzhiyun } __packed req;
22*4882a593Smuzhiyun struct {
23*4882a593Smuzhiyun u32 id;
24*4882a593Smuzhiyun } resp;
25*4882a593Smuzhiyun } data;
26*4882a593Smuzhiyun } __packed __aligned(4);
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun struct imx_sc_msg_misc_get_soc_uid {
29*4882a593Smuzhiyun struct imx_sc_rpc_msg hdr;
30*4882a593Smuzhiyun u32 uid_low;
31*4882a593Smuzhiyun u32 uid_high;
32*4882a593Smuzhiyun } __packed;
33*4882a593Smuzhiyun
imx_scu_soc_uid(u64 * soc_uid)34*4882a593Smuzhiyun static int imx_scu_soc_uid(u64 *soc_uid)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun struct imx_sc_msg_misc_get_soc_uid msg;
37*4882a593Smuzhiyun struct imx_sc_rpc_msg *hdr = &msg.hdr;
38*4882a593Smuzhiyun int ret;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun hdr->ver = IMX_SC_RPC_VERSION;
41*4882a593Smuzhiyun hdr->svc = IMX_SC_RPC_SVC_MISC;
42*4882a593Smuzhiyun hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
43*4882a593Smuzhiyun hdr->size = 1;
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
46*4882a593Smuzhiyun if (ret) {
47*4882a593Smuzhiyun pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
48*4882a593Smuzhiyun return ret;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun *soc_uid = msg.uid_high;
52*4882a593Smuzhiyun *soc_uid <<= 32;
53*4882a593Smuzhiyun *soc_uid |= msg.uid_low;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun return 0;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
imx_scu_soc_id(void)58*4882a593Smuzhiyun static int imx_scu_soc_id(void)
59*4882a593Smuzhiyun {
60*4882a593Smuzhiyun struct imx_sc_msg_misc_get_soc_id msg;
61*4882a593Smuzhiyun struct imx_sc_rpc_msg *hdr = &msg.hdr;
62*4882a593Smuzhiyun int ret;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun hdr->ver = IMX_SC_RPC_VERSION;
65*4882a593Smuzhiyun hdr->svc = IMX_SC_RPC_SVC_MISC;
66*4882a593Smuzhiyun hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
67*4882a593Smuzhiyun hdr->size = 3;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun msg.data.req.control = IMX_SC_C_ID;
70*4882a593Smuzhiyun msg.data.req.resource = IMX_SC_R_SYSTEM;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
73*4882a593Smuzhiyun if (ret) {
74*4882a593Smuzhiyun pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
75*4882a593Smuzhiyun return ret;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun return msg.data.resp.id;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
imx_scu_soc_init(struct device * dev)81*4882a593Smuzhiyun int imx_scu_soc_init(struct device *dev)
82*4882a593Smuzhiyun {
83*4882a593Smuzhiyun struct soc_device_attribute *soc_dev_attr;
84*4882a593Smuzhiyun struct soc_device *soc_dev;
85*4882a593Smuzhiyun int id, ret;
86*4882a593Smuzhiyun u64 uid = 0;
87*4882a593Smuzhiyun u32 val;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun ret = imx_scu_get_handle(&imx_sc_soc_ipc_handle);
90*4882a593Smuzhiyun if (ret)
91*4882a593Smuzhiyun return ret;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr),
94*4882a593Smuzhiyun GFP_KERNEL);
95*4882a593Smuzhiyun if (!soc_dev_attr)
96*4882a593Smuzhiyun return -ENOMEM;
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun soc_dev_attr->family = "Freescale i.MX";
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun ret = of_property_read_string(of_root,
101*4882a593Smuzhiyun "model",
102*4882a593Smuzhiyun &soc_dev_attr->machine);
103*4882a593Smuzhiyun if (ret)
104*4882a593Smuzhiyun return ret;
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun id = imx_scu_soc_id();
107*4882a593Smuzhiyun if (id < 0)
108*4882a593Smuzhiyun return -EINVAL;
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun ret = imx_scu_soc_uid(&uid);
111*4882a593Smuzhiyun if (ret < 0)
112*4882a593Smuzhiyun return -EINVAL;
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun /* format soc_id value passed from SCU firmware */
115*4882a593Smuzhiyun val = id & 0x1f;
116*4882a593Smuzhiyun soc_dev_attr->soc_id = devm_kasprintf(dev, GFP_KERNEL, "0x%x", val);
117*4882a593Smuzhiyun if (!soc_dev_attr->soc_id)
118*4882a593Smuzhiyun return -ENOMEM;
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun /* format revision value passed from SCU firmware */
121*4882a593Smuzhiyun val = (id >> 5) & 0xf;
122*4882a593Smuzhiyun val = (((val >> 2) + 1) << 4) | (val & 0x3);
123*4882a593Smuzhiyun soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
124*4882a593Smuzhiyun (val >> 4) & 0xf, val & 0xf);
125*4882a593Smuzhiyun if (!soc_dev_attr->revision)
126*4882a593Smuzhiyun return -ENOMEM;
127*4882a593Smuzhiyun
128*4882a593Smuzhiyun soc_dev_attr->serial_number = devm_kasprintf(dev, GFP_KERNEL,
129*4882a593Smuzhiyun "%016llX", uid);
130*4882a593Smuzhiyun if (!soc_dev_attr->serial_number)
131*4882a593Smuzhiyun return -ENOMEM;
132*4882a593Smuzhiyun
133*4882a593Smuzhiyun soc_dev = soc_device_register(soc_dev_attr);
134*4882a593Smuzhiyun if (IS_ERR(soc_dev))
135*4882a593Smuzhiyun return PTR_ERR(soc_dev);
136*4882a593Smuzhiyun
137*4882a593Smuzhiyun return 0;
138*4882a593Smuzhiyun }
139