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         const struct of_device_id *match;
  35         struct device_node *root;
  36
  37         root = of_find_node_by_path("/");
  38         if (!root)
  39                 return false;
  40
  41         match = of_match_node(brcmstb_machine_match, root);
  42         of_node_put(root);
  43
  44         return match != NULL;
  45 }
  46
  47 static const struct of_device_id sun_top_ctrl_match[] = {
  48         { .compatible = "brcm,bcm7125-sun-top-ctrl", },
  49         { .compatible = "brcm,bcm7346-sun-top-ctrl", },
  50         { .compatible = "brcm,bcm7358-sun-top-ctrl", },
  51         { .compatible = "brcm,bcm7360-sun-top-ctrl", },
  52         { .compatible = "brcm,bcm7362-sun-top-ctrl", },
  53         { .compatible = "brcm,bcm7420-sun-top-ctrl", },
  54         { .compatible = "brcm,bcm7425-sun-top-ctrl", },
  55         { .compatible = "brcm,bcm7429-sun-top-ctrl", },
  56         { .compatible = "brcm,bcm7435-sun-top-ctrl", },
  57         { .compatible = "brcm,brcmstb-sun-top-ctrl", },
  58         { }
  59 };
  60
  61 static int __init brcmstb_soc_device_init(void)
  62 {
  63         struct soc_device_attribute *soc_dev_attr;
  64         struct soc_device *soc_dev;
  65         struct device_node *sun_top_ctrl;
  66         void __iomem *sun_top_ctrl_base;
  67         int ret = 0;
  68
  69         sun_top_ctrl = of_find_matching_node(NULL, sun_top_ctrl_match);
  70         if (!sun_top_ctrl)
  71                 return -ENODEV;
  72
  73         sun_top_ctrl_base = of_iomap(sun_top_ctrl, 0);
  74         if (!sun_top_ctrl_base)
  75                 return -ENODEV;
  76
  77         family_id = readl(sun_top_ctrl_base);
  78         product_id = readl(sun_top_ctrl_base + 0x4);
  79
  80         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
  81         if (!soc_dev_attr) {
  82                 ret = -ENOMEM;
  83                 goto out;
  84         }
  85
  86         soc_dev_attr->family = kasprintf(GFP_KERNEL, "%x",
  87                                          family_id >> 28 ?
  88                                          family_id >> 16 : family_id >> 8);
  89         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%x",
  90                                          product_id >> 28 ?
  91                                          product_id >> 16 : product_id >> 8);
  92         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%c%d",
  93                                          ((product_id & 0xf0) >> 4) + 'A',
  94                                            product_id & 0xf);
  95
  96         soc_dev = soc_device_register(soc_dev_attr);
  97         if (IS_ERR(soc_dev)) {
  98                 kfree(soc_dev_attr->family);
  99                 kfree(soc_dev_attr->soc_id);
 100                 kfree(soc_dev_attr->revision);
 101                 kfree(soc_dev_attr);
 102                 ret = -ENODEV;
 103                 goto out;
 104         }
 105
 106         return 0;
 107
 108 out:
 109         iounmap(sun_top_ctrl_base);
 110         return ret;
 111 }
 112 arch_initcall(brcmstb_soc_device_init);