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  *  0                   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         { 0xBB75, "J721S2"},
  45         { 0xBB7E, "AM62X" },
  46         { 0xBB80, "J784S4" },
  47         { 0xBB8D, "AM62AX" },
  48         { 0xBB9D, "AM62PX" },
  49 };
  50
  51 static int
  52 k3_chipinfo_partno_to_names(unsigned int partno,
  53                             struct soc_device_attribute *soc_dev_attr)
  54 {
  55         int i;
  56
  57         for (i = 0; i < ARRAY_SIZE(k3_soc_ids); i++)
  58                 if (partno == k3_soc_ids[i].id) {
  59                         soc_dev_attr->family = k3_soc_ids[i].family_name;
  60                         return 0;
  61                 }
  62
  63         return -ENODEV;
  64 }
  65
  66 static int k3_chipinfo_probe(struct platform_device *pdev)
  67 {
  68         struct device_node *node = pdev->dev.of_node;
  69         struct soc_device_attribute *soc_dev_attr;
  70         struct device *dev = &pdev->dev;
  71         struct soc_device *soc_dev;
  72         struct regmap *regmap;
  73         u32 partno_id;
  74         u32 variant;
  75         u32 jtag_id;
  76         u32 mfg;
  77         int ret;
  78
  79         regmap = device_node_to_regmap(node);
  80         if (IS_ERR(regmap))
  81                 return PTR_ERR(regmap);
  82
  83         ret = regmap_read(regmap, CTRLMMR_WKUP_JTAGID_REG, &jtag_id);
  84         if (ret < 0)
  85                 return ret;
  86
  87         mfg = (jtag_id & CTRLMMR_WKUP_JTAGID_MFG_MASK) >>
  88                CTRLMMR_WKUP_JTAGID_MFG_SHIFT;
  89
  90         if (mfg != CTRLMMR_WKUP_JTAGID_MFG_TI) {
  91                 dev_err(dev, "Invalid MFG SoC\n");
  92                 return -ENODEV;
  93         }
  94
  95         variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >>
  96                   CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT;
  97         variant++;
  98
  99         partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >>
 100                  CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT;
 101
 102         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 103         if (!soc_dev_attr)
 104                 return -ENOMEM;
 105
 106         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant);
 107         if (!soc_dev_attr->revision) {
 108                 ret = -ENOMEM;
 109                 goto err;
 110         }
 111
 112         ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr);
 113         if (ret) {
 114                 dev_err(dev, "Unknown SoC JTAGID[0x%08X]: %d\n", jtag_id, ret);
 115                 goto err_free_rev;
 116         }
 117
 118         node = of_find_node_by_path("/");
 119         of_property_read_string(node, "model", &soc_dev_attr->machine);
 120         of_node_put(node);
 121
 122         soc_dev = soc_device_register(soc_dev_attr);
 123         if (IS_ERR(soc_dev)) {
 124                 ret = PTR_ERR(soc_dev);
 125                 goto err_free_rev;
 126         }
 127
 128         dev_info(dev, "Family:%s rev:%s JTAGID[0x%08x] Detected\n",
 129                  soc_dev_attr->family,
 130                  soc_dev_attr->revision, jtag_id);
 131
 132         return 0;
 133
 134 err_free_rev:
 135         kfree(soc_dev_attr->revision);
 136 err:
 137         kfree(soc_dev_attr);
 138         return ret;
 139 }
 140
 141 static const struct of_device_id k3_chipinfo_of_match[] = {
 142         { .compatible = "ti,am654-chipid", },
 143         { /* sentinel */ },
 144 };
 145
 146 static struct platform_driver k3_chipinfo_driver = {
 147         .driver = {
 148                 .name = "k3-chipinfo",
 149                 .of_match_table = k3_chipinfo_of_match,
 150         },
 151         .probe = k3_chipinfo_probe,
 152 };
 153
 154 static int __init k3_chipinfo_init(void)
 155 {
 156         return platform_driver_register(&k3_chipinfo_driver);
 157 }
 158 subsys_initcall(k3_chipinfo_init);