drivers/soc/bcm/brcmstb/common.c

   1 /*
   2  * Copyright © 2014 NVIDIA Corporation
   3  * Copyright © 2015 Broadcom Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/io.h>
  16 #include <linux/of.h>
  17 #include <linux/of_address.h>
  18 #include <linux/slab.h>
  19 #include <linux/soc/brcmstb/brcmstb.h>
  20 #include <linux/sys_soc.h>
  21
  22 #include <soc/brcmstb/common.h>
  23
  24 static u32 family_id;
  25 static u32 product_id;
  26
  27 static const struct of_device_id brcmstb_machine_match[] = {
  28         { .compatible = "brcm,brcmstb", },
  29         { }
  30 };
  31
  32 bool soc_is_brcmstb(void)
  33 {
  34         struct device_node *root;
  35
  36         root = of_find_node_by_path("/");
  37         if (!root)
  38                 return false;
  39
  40         return of_match_node(brcmstb_machine_match, root) != NULL;
  41 }
  42
  43 static const struct of_device_id sun_top_ctrl_match[] = {
  44         { .compatible = "brcm,brcmstb-sun-top-ctrl", },
  45         { }
  46 };
  47
  48 static int __init brcmstb_soc_device_init(void)
  49 {
  50         struct soc_device_attribute *soc_dev_attr;
  51         struct soc_device *soc_dev;
  52         struct device_node *sun_top_ctrl;
  53         void __iomem *sun_top_ctrl_base;
  54         int ret = 0;
  55
  56         sun_top_ctrl = of_find_matching_node(NULL, sun_top_ctrl_match);
  57         if (!sun_top_ctrl)
  58                 return -ENODEV;
  59
  60         sun_top_ctrl_base = of_iomap(sun_top_ctrl, 0);
  61         if (!sun_top_ctrl_base)
  62                 return -ENODEV;
  63
  64         family_id = readl(sun_top_ctrl_base);
  65         product_id = readl(sun_top_ctrl_base + 0x4);
  66
  67         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
  68         if (!soc_dev_attr) {
  69                 ret = -ENOMEM;
  70                 goto out;
  71         }
  72
  73         soc_dev_attr->family = kasprintf(GFP_KERNEL, "%x",
  74                                          family_id >> 28 ?
  75                                          family_id >> 16 : family_id >> 8);
  76         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%x",
  77                                          product_id >> 28 ?
  78                                          product_id >> 16 : product_id >> 8);
  79         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%c%d",
  80                                          ((product_id & 0xf0) >> 4) + 'A',
  81                                            product_id & 0xf);
  82
  83         soc_dev = soc_device_register(soc_dev_attr);
  84         if (IS_ERR(soc_dev)) {
  85                 kfree(soc_dev_attr->family);
  86                 kfree(soc_dev_attr->soc_id);
  87                 kfree(soc_dev_attr->revision);
  88                 kfree(soc_dev_attr);
  89                 ret = -ENODEV;
  90                 goto out;
  91         }
  92
  93         return 0;
  94
  95 out:
  96         iounmap(sun_top_ctrl_base);
  97         return ret;
  98 }
  99 arch_initcall(brcmstb_soc_device_init);