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

DEFINITIONS

1. soc_uid_show
2. imx_scu_soc_id
3. imx_scu_soc_probe
4. imx_scu_soc_init

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