firmware/imx/imx-scu-soc.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Copyright 2019 NXP.
0004  */
0005
0006 #include <dt-bindings/firmware/imx/rsrc.h>
0007 #include <linux/firmware/imx/sci.h>
0008 #include <linux/slab.h>
0009 #include <linux/sys_soc.h>
0010 #include <linux/platform_device.h>
0011 #include <linux/of.h>
0012
0013 static struct imx_sc_ipc *imx_sc_soc_ipc_handle;
0014
0015 struct imx_sc_msg_misc_get_soc_id {
0016     struct imx_sc_rpc_msg hdr;
0017     union {
0018         struct {
0019             u32 control;
0020             u16 resource;
0021         } __packed req;
0022         struct {
0023             u32 id;
0024         } resp;
0025     } data;
0026 } __packed __aligned(4);
0027
0028 struct imx_sc_msg_misc_get_soc_uid {
0029     struct imx_sc_rpc_msg hdr;
0030     u32 uid_low;
0031     u32 uid_high;
0032 } __packed;
0033
0034 static int imx_scu_soc_uid(u64 *soc_uid)
0035 {
0036     struct imx_sc_msg_misc_get_soc_uid msg;
0037     struct imx_sc_rpc_msg *hdr = &msg.hdr;
0038     int ret;
0039
0040     hdr->ver = IMX_SC_RPC_VERSION;
0041     hdr->svc = IMX_SC_RPC_SVC_MISC;
0042     hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
0043     hdr->size = 1;
0044
0045     ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
0046     if (ret) {
0047         pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
0048         return ret;
0049     }
0050
0051     *soc_uid = msg.uid_high;
0052     *soc_uid <<= 32;
0053     *soc_uid |= msg.uid_low;
0054
0055     return 0;
0056 }
0057
0058 static int imx_scu_soc_id(void)
0059 {
0060     struct imx_sc_msg_misc_get_soc_id msg;
0061     struct imx_sc_rpc_msg *hdr = &msg.hdr;
0062     int ret;
0063
0064     hdr->ver = IMX_SC_RPC_VERSION;
0065     hdr->svc = IMX_SC_RPC_SVC_MISC;
0066     hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
0067     hdr->size = 3;
0068
0069     msg.data.req.control = IMX_SC_C_ID;
0070     msg.data.req.resource = IMX_SC_R_SYSTEM;
0071
0072     ret = imx_scu_call_rpc(imx_sc_soc_ipc_handle, &msg, true);
0073     if (ret) {
0074         pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
0075         return ret;
0076     }
0077
0078     return msg.data.resp.id;
0079 }
0080
0081 int imx_scu_soc_init(struct device *dev)
0082 {
0083     struct soc_device_attribute *soc_dev_attr;
0084     struct soc_device *soc_dev;
0085     int id, ret;
0086     u64 uid = 0;
0087     u32 val;
0088
0089     ret = imx_scu_get_handle(&imx_sc_soc_ipc_handle);
0090     if (ret)
0091         return ret;
0092
0093     soc_dev_attr = devm_kzalloc(dev, sizeof(*soc_dev_attr),
0094                     GFP_KERNEL);
0095     if (!soc_dev_attr)
0096         return -ENOMEM;
0097
0098     soc_dev_attr->family = "Freescale i.MX";
0099
0100     ret = of_property_read_string(of_root,
0101                       "model",
0102                       &soc_dev_attr->machine);
0103     if (ret)
0104         return ret;
0105
0106     id = imx_scu_soc_id();
0107     if (id < 0)
0108         return -EINVAL;
0109
0110     ret = imx_scu_soc_uid(&uid);
0111     if (ret < 0)
0112         return -EINVAL;
0113
0114     /* format soc_id value passed from SCU firmware */
0115     val = id & 0x1f;
0116     soc_dev_attr->soc_id = devm_kasprintf(dev, GFP_KERNEL, "0x%x", val);
0117     if (!soc_dev_attr->soc_id)
0118         return -ENOMEM;
0119
0120     /* format revision value passed from SCU firmware */
0121     val = (id >> 5) & 0xf;
0122     val = (((val >> 2) + 1) << 4) | (val & 0x3);
0123     soc_dev_attr->revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
0124                         (val >> 4) & 0xf, val & 0xf);
0125     if (!soc_dev_attr->revision)
0126         return -ENOMEM;
0127
0128     soc_dev_attr->serial_number = devm_kasprintf(dev, GFP_KERNEL,
0129                              "%016llX", uid);
0130     if (!soc_dev_attr->serial_number)
0131         return -ENOMEM;
0132
0133     soc_dev = soc_device_register(soc_dev_attr);
0134     if (IS_ERR(soc_dev))
0135         return PTR_ERR(soc_dev);
0136
0137     return 0;
0138 }