drivers/soc/imx/soc-imx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2020 NXP
   4  */
   5
   6 #include <linux/mfd/syscon.h>
   7 #include <linux/of.h>
   8 #include <linux/of_address.h>
   9 #include <linux/regmap.h>
  10 #include <linux/slab.h>
  11 #include <linux/sys_soc.h>
  12
  13 #include <soc/imx/cpu.h>
  14 #include <soc/imx/revision.h>
  15
  16 #define IIM_UID         0x820
  17
  18 #define OCOTP_UID_H     0x420
  19 #define OCOTP_UID_L     0x410
  20
  21 #define OCOTP_ULP_UID_1         0x4b0
  22 #define OCOTP_ULP_UID_2         0x4c0
  23 #define OCOTP_ULP_UID_3         0x4d0
  24 #define OCOTP_ULP_UID_4         0x4e0
  25
  26 static int __init imx_soc_device_init(void)
  27 {
  28         struct soc_device_attribute *soc_dev_attr;
  29         const char *ocotp_compat = NULL;
  30         struct soc_device *soc_dev;
  31         struct device_node *root;
  32         struct regmap *ocotp = NULL;
  33         const char *soc_id;
  34         u64 soc_uid = 0;
  35         u32 val;
  36         int ret;
  37         int i;
  38
  39         /* Return early if this is running on devices with different SoCs */
  40         if (!__mxc_cpu_type)
  41                 return 0;
  42
  43         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
  44         if (!soc_dev_attr)
  45                 return -ENOMEM;
  46
  47         soc_dev_attr->family = "Freescale i.MX";
  48
  49         root = of_find_node_by_path("/");
  50         ret = of_property_read_string(root, "model", &soc_dev_attr->machine);
  51         of_node_put(root);
  52         if (ret)
  53                 goto free_soc;
  54
  55         switch (__mxc_cpu_type) {
  56         case MXC_CPU_MX1:
  57                 soc_id = "i.MX1";
  58                 break;
  59         case MXC_CPU_MX21:
  60                 soc_id = "i.MX21";
  61                 break;
  62         case MXC_CPU_MX25:
  63                 soc_id = "i.MX25";
  64                 break;
  65         case MXC_CPU_MX27:
  66                 soc_id = "i.MX27";
  67                 break;
  68         case MXC_CPU_MX31:
  69                 soc_id = "i.MX31";
  70                 break;
  71         case MXC_CPU_MX35:
  72                 soc_id = "i.MX35";
  73                 break;
  74         case MXC_CPU_MX50:
  75                 soc_id = "i.MX50";
  76                 break;
  77         case MXC_CPU_MX51:
  78                 ocotp_compat = "fsl,imx51-iim";
  79                 soc_id = "i.MX51";
  80                 break;
  81         case MXC_CPU_MX53:
  82                 ocotp_compat = "fsl,imx53-iim";
  83                 soc_id = "i.MX53";
  84                 break;
  85         case MXC_CPU_IMX6SL:
  86                 ocotp_compat = "fsl,imx6sl-ocotp";
  87                 soc_id = "i.MX6SL";
  88                 break;
  89         case MXC_CPU_IMX6DL:
  90                 ocotp_compat = "fsl,imx6q-ocotp";
  91                 soc_id = "i.MX6DL";
  92                 break;
  93         case MXC_CPU_IMX6SX:
  94                 ocotp_compat = "fsl,imx6sx-ocotp";
  95                 soc_id = "i.MX6SX";
  96                 break;
  97         case MXC_CPU_IMX6Q:
  98                 ocotp_compat = "fsl,imx6q-ocotp";
  99                 soc_id = "i.MX6Q";
 100                 break;
 101         case MXC_CPU_IMX6UL:
 102                 ocotp_compat = "fsl,imx6ul-ocotp";
 103                 soc_id = "i.MX6UL";
 104                 break;
 105         case MXC_CPU_IMX6ULL:
 106                 ocotp_compat = "fsl,imx6ull-ocotp";
 107                 soc_id = "i.MX6ULL";
 108                 break;
 109         case MXC_CPU_IMX6ULZ:
 110                 ocotp_compat = "fsl,imx6ull-ocotp";
 111                 soc_id = "i.MX6ULZ";
 112                 break;
 113         case MXC_CPU_IMX6SLL:
 114                 ocotp_compat = "fsl,imx6sll-ocotp";
 115                 soc_id = "i.MX6SLL";
 116                 break;
 117         case MXC_CPU_IMX7D:
 118                 ocotp_compat = "fsl,imx7d-ocotp";
 119                 soc_id = "i.MX7D";
 120                 break;
 121         case MXC_CPU_IMX7ULP:
 122                 ocotp_compat = "fsl,imx7ulp-ocotp";
 123                 soc_id = "i.MX7ULP";
 124                 break;
 125         case MXC_CPU_VF500:
 126                 ocotp_compat = "fsl,vf610-ocotp";
 127                 soc_id = "VF500";
 128                 break;
 129         case MXC_CPU_VF510:
 130                 ocotp_compat = "fsl,vf610-ocotp";
 131                 soc_id = "VF510";
 132                 break;
 133         case MXC_CPU_VF600:
 134                 ocotp_compat = "fsl,vf610-ocotp";
 135                 soc_id = "VF600";
 136                 break;
 137         case MXC_CPU_VF610:
 138                 ocotp_compat = "fsl,vf610-ocotp";
 139                 soc_id = "VF610";
 140                 break;
 141         default:
 142                 soc_id = "Unknown";
 143         }
 144         soc_dev_attr->soc_id = soc_id;
 145
 146         if (ocotp_compat) {
 147                 ocotp = syscon_regmap_lookup_by_compatible(ocotp_compat);
 148                 if (IS_ERR(ocotp))
 149                         pr_err("%s: failed to find %s regmap!\n", __func__, ocotp_compat);
 150         }
 151
 152         if (!IS_ERR_OR_NULL(ocotp)) {
 153                 if (__mxc_cpu_type == MXC_CPU_IMX7ULP) {
 154                         regmap_read(ocotp, OCOTP_ULP_UID_4, &val);
 155                         soc_uid = val & 0xffff;
 156                         regmap_read(ocotp, OCOTP_ULP_UID_3, &val);
 157                         soc_uid <<= 16;
 158                         soc_uid |= val & 0xffff;
 159                         regmap_read(ocotp, OCOTP_ULP_UID_2, &val);
 160                         soc_uid <<= 16;
 161                         soc_uid |= val & 0xffff;
 162                         regmap_read(ocotp, OCOTP_ULP_UID_1, &val);
 163                         soc_uid <<= 16;
 164                         soc_uid |= val & 0xffff;
 165                 } else if (__mxc_cpu_type == MXC_CPU_MX51 ||
 166                            __mxc_cpu_type == MXC_CPU_MX53) {
 167                         for (i=0; i < 8; i++) {
 168                                 regmap_read(ocotp, IIM_UID + i*4, &val);
 169                                 soc_uid <<= 8;
 170                                 soc_uid |= (val & 0xff);
 171                         }
 172                 } else {
 173                         regmap_read(ocotp, OCOTP_UID_H, &val);
 174                         soc_uid = val;
 175                         regmap_read(ocotp, OCOTP_UID_L, &val);
 176                         soc_uid <<= 32;
 177                         soc_uid |= val;
 178                 }
 179         }
 180
 181         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d.%d",
 182                                            (imx_get_soc_revision() >> 4) & 0xf,
 183                                            imx_get_soc_revision() & 0xf);
 184         if (!soc_dev_attr->revision) {
 185                 ret = -ENOMEM;
 186                 goto free_soc;
 187         }
 188
 189         soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
 190         if (!soc_dev_attr->serial_number) {
 191                 ret = -ENOMEM;
 192                 goto free_rev;
 193         }
 194
 195         soc_dev = soc_device_register(soc_dev_attr);
 196         if (IS_ERR(soc_dev)) {
 197                 ret = PTR_ERR(soc_dev);
 198                 goto free_serial_number;
 199         }
 200
 201         return 0;
 202
 203 free_serial_number:
 204         kfree(soc_dev_attr->serial_number);
 205 free_rev:
 206         kfree(soc_dev_attr->revision);
 207 free_soc:
 208         kfree(soc_dev_attr);
 209         return ret;
 210 }
 211 device_initcall(imx_soc_device_init);