drivers/soc/versatile/soc-integrator.c

   1 /*
   2  * Copyright (C) 2014 Linaro Ltd.
   3  *
   4  * Author: Linus Walleij <linus.walleij@linaro.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  */
  11 #include <linux/init.h>
  12 #include <linux/io.h>
  13 #include <linux/slab.h>
  14 #include <linux/sys_soc.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/mfd/syscon.h>
  17 #include <linux/regmap.h>
  18 #include <linux/of.h>
  19
  20 #define INTEGRATOR_HDR_ID_OFFSET        0x00
  21
  22 static u32 integrator_coreid;
  23
  24 static const struct of_device_id integrator_cm_match[] = {
  25         { .compatible = "arm,core-module-integrator", },
  26         { }
  27 };
  28
  29 static const char *integrator_arch_str(u32 id)
  30 {
  31         switch ((id >> 16) & 0xff) {
  32         case 0x00:
  33                 return "ASB little-endian";
  34         case 0x01:
  35                 return "AHB little-endian";
  36         case 0x03:
  37                 return "AHB-Lite system bus, bi-endian";
  38         case 0x04:
  39                 return "AHB";
  40         case 0x08:
  41                 return "AHB system bus, ASB processor bus";
  42         default:
  43                 return "Unknown";
  44         }
  45 }
  46
  47 static const char *integrator_fpga_str(u32 id)
  48 {
  49         switch ((id >> 12) & 0xf) {
  50         case 0x01:
  51                 return "XC4062";
  52         case 0x02:
  53                 return "XC4085";
  54         case 0x03:
  55                 return "XVC600";
  56         case 0x04:
  57                 return "EPM7256AE (Altera PLD)";
  58         default:
  59                 return "Unknown";
  60         }
  61 }
  62
  63 static ssize_t integrator_get_manf(struct device *dev,
  64                               struct device_attribute *attr,
  65                               char *buf)
  66 {
  67         return sprintf(buf, "%02x\n", integrator_coreid >> 24);
  68 }
  69
  70 static struct device_attribute integrator_manf_attr =
  71         __ATTR(manufacturer,  S_IRUGO, integrator_get_manf,  NULL);
  72
  73 static ssize_t integrator_get_arch(struct device *dev,
  74                               struct device_attribute *attr,
  75                               char *buf)
  76 {
  77         return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
  78 }
  79
  80 static struct device_attribute integrator_arch_attr =
  81         __ATTR(arch,  S_IRUGO, integrator_get_arch,  NULL);
  82
  83 static ssize_t integrator_get_fpga(struct device *dev,
  84                               struct device_attribute *attr,
  85                               char *buf)
  86 {
  87         return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
  88 }
  89
  90 static struct device_attribute integrator_fpga_attr =
  91         __ATTR(fpga,  S_IRUGO, integrator_get_fpga,  NULL);
  92
  93 static ssize_t integrator_get_build(struct device *dev,
  94                                struct device_attribute *attr,
  95                                char *buf)
  96 {
  97         return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
  98 }
  99
 100 static struct device_attribute integrator_build_attr =
 101         __ATTR(build,  S_IRUGO, integrator_get_build,  NULL);
 102
 103 static int __init integrator_soc_init(void)
 104 {
 105         static struct regmap *syscon_regmap;
 106         struct soc_device *soc_dev;
 107         struct soc_device_attribute *soc_dev_attr;
 108         struct device_node *np;
 109         struct device *dev;
 110         u32 val;
 111         int ret;
 112
 113         np = of_find_matching_node(NULL, integrator_cm_match);
 114         if (!np)
 115                 return -ENODEV;
 116
 117         syscon_regmap = syscon_node_to_regmap(np);
 118         if (IS_ERR(syscon_regmap))
 119                 return PTR_ERR(syscon_regmap);
 120
 121         ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
 122                           &val);
 123         if (ret)
 124                 return -ENODEV;
 125         integrator_coreid = val;
 126
 127         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 128         if (!soc_dev_attr)
 129                 return -ENOMEM;
 130
 131         soc_dev_attr->soc_id = "Integrator";
 132         soc_dev_attr->machine = "Integrator";
 133         soc_dev_attr->family = "Versatile";
 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         device_create_file(dev, &integrator_manf_attr);
 142         device_create_file(dev, &integrator_arch_attr);
 143         device_create_file(dev, &integrator_fpga_attr);
 144         device_create_file(dev, &integrator_build_attr);
 145
 146         dev_info(dev, "Detected ARM core module:\n");
 147         dev_info(dev, "    Manufacturer: %02x\n", (val >> 24));
 148         dev_info(dev, "    Architecture: %s\n", integrator_arch_str(val));
 149         dev_info(dev, "    FPGA: %s\n", integrator_fpga_str(val));
 150         dev_info(dev, "    Build: %02x\n", (val >> 4) & 0xFF);
 151         dev_info(dev, "    Rev: %c\n", ('A' + (val & 0x03)));
 152
 153         return 0;
 154 }
 155 device_initcall(integrator_soc_init);