drivers/soc/versatile/soc-integrator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2014 Linaro Ltd.
   4  *
   5  * Author: Linus Walleij <linus.walleij@linaro.org>
   6  */
   7 #include <linux/init.h>
   8 #include <linux/io.h>
   9 #include <linux/slab.h>
  10 #include <linux/sys_soc.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/regmap.h>
  14 #include <linux/of.h>
  15
  16 #define INTEGRATOR_HDR_ID_OFFSET        0x00
  17
  18 static u32 integrator_coreid;
  19
  20 static const struct of_device_id integrator_cm_match[] = {
  21         { .compatible = "arm,core-module-integrator", },
  22         { }
  23 };
  24
  25 static const char *integrator_arch_str(u32 id)
  26 {
  27         switch ((id >> 16) & 0xff) {
  28         case 0x00:
  29                 return "ASB little-endian";
  30         case 0x01:
  31                 return "AHB little-endian";
  32         case 0x03:
  33                 return "AHB-Lite system bus, bi-endian";
  34         case 0x04:
  35                 return "AHB";
  36         case 0x08:
  37                 return "AHB system bus, ASB processor bus";
  38         default:
  39                 return "Unknown";
  40         }
  41 }
  42
  43 static const char *integrator_fpga_str(u32 id)
  44 {
  45         switch ((id >> 12) & 0xf) {
  46         case 0x01:
  47                 return "XC4062";
  48         case 0x02:
  49                 return "XC4085";
  50         case 0x03:
  51                 return "XVC600";
  52         case 0x04:
  53                 return "EPM7256AE (Altera PLD)";
  54         default:
  55                 return "Unknown";
  56         }
  57 }
  58
  59 static ssize_t
  60 manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
  61 {
  62         return sprintf(buf, "%02x\n", integrator_coreid >> 24);
  63 }
  64
  65 static DEVICE_ATTR_RO(manufacturer);
  66
  67 static ssize_t
  68 arch_show(struct device *dev, struct device_attribute *attr, char *buf)
  69 {
  70         return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
  71 }
  72
  73 static DEVICE_ATTR_RO(arch);
  74
  75 static ssize_t
  76 fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
  77 {
  78         return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
  79 }
  80
  81 static DEVICE_ATTR_RO(fpga);
  82
  83 static ssize_t
  84 build_show(struct device *dev, struct device_attribute *attr, char *buf)
  85 {
  86         return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
  87 }
  88
  89 static DEVICE_ATTR_RO(build);
  90
  91 static struct attribute *integrator_attrs[] = {
  92         &dev_attr_manufacturer.attr,
  93         &dev_attr_arch.attr,
  94         &dev_attr_fpga.attr,
  95         &dev_attr_build.attr,
  96         NULL
  97 };
  98
  99 ATTRIBUTE_GROUPS(integrator);
 100
 101 static int __init integrator_soc_init(void)
 102 {
 103         struct regmap *syscon_regmap;
 104         struct soc_device *soc_dev;
 105         struct soc_device_attribute *soc_dev_attr;
 106         struct device_node *np;
 107         struct device *dev;
 108         u32 val;
 109         int ret;
 110
 111         np = of_find_matching_node(NULL, integrator_cm_match);
 112         if (!np)
 113                 return -ENODEV;
 114
 115         syscon_regmap = syscon_node_to_regmap(np);
 116         of_node_put(np);
 117         if (IS_ERR(syscon_regmap))
 118                 return PTR_ERR(syscon_regmap);
 119
 120         ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
 121                           &val);
 122         if (ret)
 123                 return -ENODEV;
 124         integrator_coreid = val;
 125
 126         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 127         if (!soc_dev_attr)
 128                 return -ENOMEM;
 129
 130         soc_dev_attr->soc_id = "Integrator";
 131         soc_dev_attr->machine = "Integrator";
 132         soc_dev_attr->family = "Versatile";
 133         soc_dev_attr->custom_attr_group = integrator_groups[0];
 134         soc_dev = soc_device_register(soc_dev_attr);
 135         if (IS_ERR(soc_dev)) {
 136                 kfree(soc_dev_attr);
 137                 return -ENODEV;
 138         }
 139         dev = soc_device_to_device(soc_dev);
 140
 141         dev_info(dev, "Detected ARM core module:\n");
 142         dev_info(dev, "    Manufacturer: %02x\n", (val >> 24));
 143         dev_info(dev, "    Architecture: %s\n", integrator_arch_str(val));
 144         dev_info(dev, "    FPGA: %s\n", integrator_fpga_str(val));
 145         dev_info(dev, "    Build: %02x\n", (val >> 4) & 0xFF);
 146         dev_info(dev, "    Rev: %c\n", ('A' + (val & 0x03)));
 147
 148         return 0;
 149 }
 150 device_initcall(integrator_soc_init);