drivers/soc/imx/soc-imx-scu.c

   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 #define IMX_SCU_SOC_DRIVER_NAME         "imx-scu-soc"
  14
  15 static struct imx_sc_ipc *soc_ipc_handle;
  16
  17 struct imx_sc_msg_misc_get_soc_id {
  18         struct imx_sc_rpc_msg hdr;
  19         union {
  20                 struct {
  21                         u32 control;
  22                         u16 resource;
  23                 } __packed req;
  24                 struct {
  25                         u32 id;
  26                 } resp;
  27         } data;
  28 } __packed;
  29
  30 struct imx_sc_msg_misc_get_soc_uid {
  31         struct imx_sc_rpc_msg hdr;
  32         u32 uid_low;
  33         u32 uid_high;
  34 } __packed;
  35
  36 static int imx_scu_soc_uid(u64 *soc_uid)
  37 {
  38         struct imx_sc_msg_misc_get_soc_uid msg;
  39         struct imx_sc_rpc_msg *hdr = &msg.hdr;
  40         int ret;
  41
  42         hdr->ver = IMX_SC_RPC_VERSION;
  43         hdr->svc = IMX_SC_RPC_SVC_MISC;
  44         hdr->func = IMX_SC_MISC_FUNC_UNIQUE_ID;
  45         hdr->size = 1;
  46
  47         ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
  48         if (ret) {
  49                 pr_err("%s: get soc uid failed, ret %d\n", __func__, ret);
  50                 return ret;
  51         }
  52
  53         *soc_uid = msg.uid_high;
  54         *soc_uid <<= 32;
  55         *soc_uid |= msg.uid_low;
  56
  57         return 0;
  58 }
  59
  60 static int imx_scu_soc_id(void)
  61 {
  62         struct imx_sc_msg_misc_get_soc_id msg;
  63         struct imx_sc_rpc_msg *hdr = &msg.hdr;
  64         int ret;
  65
  66         hdr->ver = IMX_SC_RPC_VERSION;
  67         hdr->svc = IMX_SC_RPC_SVC_MISC;
  68         hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
  69         hdr->size = 3;
  70
  71         msg.data.req.control = IMX_SC_C_ID;
  72         msg.data.req.resource = IMX_SC_R_SYSTEM;
  73
  74         ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
  75         if (ret) {
  76                 pr_err("%s: get soc info failed, ret %d\n", __func__, ret);
  77                 return ret;
  78         }
  79
  80         return msg.data.resp.id;
  81 }
  82
  83 static int imx_scu_soc_probe(struct platform_device *pdev)
  84 {
  85         struct soc_device_attribute *soc_dev_attr;
  86         struct soc_device *soc_dev;
  87         int id, ret;
  88         u64 uid = 0;
  89         u32 val;
  90
  91         ret = imx_scu_get_handle(&soc_ipc_handle);
  92         if (ret)
  93                 return ret;
  94
  95         soc_dev_attr = devm_kzalloc(&pdev->dev, sizeof(*soc_dev_attr),
  96                                     GFP_KERNEL);
  97         if (!soc_dev_attr)
  98                 return -ENOMEM;
  99
 100         soc_dev_attr->family = "Freescale i.MX";
 101
 102         ret = of_property_read_string(of_root,
 103                                       "model",
 104                                       &soc_dev_attr->machine);
 105         if (ret)
 106                 return ret;
 107
 108         id = imx_scu_soc_id();
 109         if (id < 0)
 110                 return -EINVAL;
 111
 112         ret = imx_scu_soc_uid(&uid);
 113         if (ret < 0)
 114                 return -EINVAL;
 115
 116         /* format soc_id value passed from SCU firmware */
 117         val = id & 0x1f;
 118         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "0x%x", val);
 119         if (!soc_dev_attr->soc_id)
 120                 return -ENOMEM;
 121
 122         /* format revision value passed from SCU firmware */
 123         val = (id >> 5) & 0xf;
 124         val = (((val >> 2) + 1) << 4) | (val & 0x3);
 125         soc_dev_attr->revision = kasprintf(GFP_KERNEL,
 126                                            "%d.%d",
 127                                            (val >> 4) & 0xf,
 128                                            val & 0xf);
 129         if (!soc_dev_attr->revision) {
 130                 ret = -ENOMEM;
 131                 goto free_soc_id;
 132         }
 133
 134         soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", uid);
 135         if (!soc_dev_attr->serial_number) {
 136                 ret = -ENOMEM;
 137                 goto free_revision;
 138         }
 139
 140         soc_dev = soc_device_register(soc_dev_attr);
 141         if (IS_ERR(soc_dev)) {
 142                 ret = PTR_ERR(soc_dev);
 143                 goto free_serial_number;
 144         }
 145
 146         return 0;
 147
 148 free_serial_number:
 149         kfree(soc_dev_attr->serial_number);
 150 free_revision:
 151         kfree(soc_dev_attr->revision);
 152 free_soc_id:
 153         kfree(soc_dev_attr->soc_id);
 154         return ret;
 155 }
 156
 157 static struct platform_driver imx_scu_soc_driver = {
 158         .driver = {
 159                 .name = IMX_SCU_SOC_DRIVER_NAME,
 160         },
 161         .probe = imx_scu_soc_probe,
 162 };
 163
 164 static int __init imx_scu_soc_init(void)
 165 {
 166         struct platform_device *pdev;
 167         struct device_node *np;
 168         int ret;
 169
 170         np = of_find_compatible_node(NULL, NULL, "fsl,imx-scu");
 171         if (!np)
 172                 return -ENODEV;
 173
 174         of_node_put(np);
 175
 176         ret = platform_driver_register(&imx_scu_soc_driver);
 177         if (ret)
 178                 return ret;
 179
 180         pdev = platform_device_register_simple(IMX_SCU_SOC_DRIVER_NAME,
 181                                                -1, NULL, 0);
 182         if (IS_ERR(pdev))
 183                 platform_driver_unregister(&imx_scu_soc_driver);
 184
 185         return PTR_ERR_OR_ZERO(pdev);
 186 }
 187 device_initcall(imx_scu_soc_init);