drivers/soc/ti/k3-socinfo.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * TI K3 SoC info driver
   4  *
   5  * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com
   6  */
   7
   8 #include <linux/mfd/syscon.h>
   9 #include <linux/of.h>
  10 #include <linux/of_address.h>
  11 #include <linux/regmap.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/slab.h>
  14 #include <linux/string.h>
  15 #include <linux/sys_soc.h>
  16
  17 #define CTRLMMR_WKUP_JTAGID_REG         0
  18 /*
  19  * Bits:
  20  *  31-28 VARIANT       Device variant
  21  *  27-12 PARTNO        Part number
  22  *  11-1  MFG           Indicates TI as manufacturer (0x17)
  23  *  1                   Always 1
  24  */
  25 #define CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT       (28)
  26 #define CTRLMMR_WKUP_JTAGID_VARIANT_MASK        GENMASK(31, 28)
  27
  28 #define CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT        (12)
  29 #define CTRLMMR_WKUP_JTAGID_PARTNO_MASK         GENMASK(27, 12)
  30
  31 #define CTRLMMR_WKUP_JTAGID_MFG_SHIFT           (1)
  32 #define CTRLMMR_WKUP_JTAGID_MFG_MASK            GENMASK(11, 1)
  33
  34 #define CTRLMMR_WKUP_JTAGID_MFG_TI              0x17
  35
  36 static const struct k3_soc_id {
  37         unsigned int id;
  38         const char *family_name;
  39 } k3_soc_ids[] = {
  40         { 0xBB5A, "AM65X" },
  41         { 0xBB64, "J721E" },
  42         { 0xBB6D, "J7200" },
  43         { 0xBB38, "AM64X" }
  44 };
  45
  46 static int
  47 k3_chipinfo_partno_to_names(unsigned int partno,
  48                             struct soc_device_attribute *soc_dev_attr)
  49 {
  50         int i;
  51
  52         for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
  53                 if (partno == k3_soc_ids[i].id) {
  54                         soc_dev_attr->family = k3_soc_ids[i].family_name;
  55                         return 0;
  56                 }
  57
  58         return -EINVAL;
  59 }
  60
  61 static int k3_chipinfo_probe(struct platform_device *pdev)
  62 {
  63         struct device_node *node = pdev->dev.of_node;
  64         struct soc_device_attribute *soc_dev_attr;
  65         struct device *dev = &pdev->dev;
  66         struct soc_device *soc_dev;
  67         struct regmap *regmap;
  68         u32 partno_id;
  69         u32 variant;
  70         u32 jtag_id;
  71         u32 mfg;
  72         int ret;
  73
  74         regmap = device_node_to_regmap(node);
  75         if (IS_ERR(regmap))
  76                 return PTR_ERR(regmap);
  77
  78         ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
  79         if (ret < 0)
  80                 return ret;
  81
  82         mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
  83                CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
  84
  85         if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
  86                 dev_err(dev, "Invalid MFG SoC\n");
  87                 return -ENODEV;
  88         }
  89
  90         variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
  91                   CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
  92         variant++;
  93
  94         partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
  95                  CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
  96
  97         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
  98         if (!soc_dev_attr)
  99                 return -ENOMEM;
 100
 101         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
 102         if (!soc_dev_attr->revision) {
 103                 ret = -ENOMEM;
 104                 goto err;
 105         }
 106
 107         ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
 108         if (ret) {
 109                 dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id);
 110                 ret = -ENODEV;
 111                 goto err_free_rev;
 112         }
 113
 114         node = of_find_node_by_path("/");
 115         of_property_read_string(node, "model", &soc_dev_attr->machine);
 116         of_node_put(node);
 117
 118         soc_dev = soc_device_register(soc_dev_attr);
 119         if (IS_ERR(soc_dev)) {
 120                 ret = PTR_ERR(soc_dev);
 121                 goto err_free_rev;
 122         }
 123
 124         dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
 125                  soc_dev_attr->family,
 126                  soc_dev_attr->revision, jtag_id);
 127
 128         return 0;
 129
 130 err_free_rev:
 131         kfree(soc_dev_attr->revision);
 132 err:
 133         kfree(soc_dev_attr);
 134         return ret;
 135 }
 136
 137 static const struct of_device_id k3_chipinfo_of_match[] = {
 138         { .compatible = "ti,am654-chipid", },
 139         { /* sentinel */ },
 140 };
 141
 142 static struct platform_driver k3_chipinfo_driver = {
 143         .driver = {
 144                 .name = "k3-chipinfo",
 145                 .of_match_table = k3_chipinfo_of_match,
 146         },
 147         .probe = k3_chipinfo_probe,
 148 };
 149
 150 static int __init k3_chipinfo_init(void)
 151 {
 152         return platform_driver_register(&k3_chipinfo_driver);
 153 }
 154 subsys_initcall(k3_chipinfo_init);