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 u32 brcmstb_get_family_id(void)
  44 {
  45         return family_id;
  46 }
  47 EXPORT_SYMBOL(brcmstb_get_family_id);
  48
  49 u32 brcmstb_get_product_id(void)
  50 {
  51         return product_id;
  52 }
  53 EXPORT_SYMBOL(brcmstb_get_product_id);
  54
  55 static const struct of_device_id sun_top_ctrl_match[] = {
  56         { .compatible = "brcm,bcm7125-sun-top-ctrl", },
  57         { .compatible = "brcm,bcm7346-sun-top-ctrl", },
  58         { .compatible = "brcm,bcm7358-sun-top-ctrl", },
  59         { .compatible = "brcm,bcm7360-sun-top-ctrl", },
  60         { .compatible = "brcm,bcm7362-sun-top-ctrl", },
  61         { .compatible = "brcm,bcm7420-sun-top-ctrl", },
  62         { .compatible = "brcm,bcm7425-sun-top-ctrl", },
  63         { .compatible = "brcm,bcm7429-sun-top-ctrl", },
  64         { .compatible = "brcm,bcm7435-sun-top-ctrl", },
  65         { .compatible = "brcm,brcmstb-sun-top-ctrl", },
  66         { }
  67 };
  68
  69 static int __init brcmstb_soc_device_early_init(void)
  70 {
  71         struct device_node *sun_top_ctrl;
  72         void __iomem *sun_top_ctrl_base;
  73         int ret = 0;
  74
  75         /* We could be on a multi-platform kernel, don't make this fatal but
  76          * bail out early
  77          */
  78         sun_top_ctrl = of_find_matching_node(NULL, sun_top_ctrl_match);
  79         if (!sun_top_ctrl)
  80                 return ret;
  81
  82         sun_top_ctrl_base = of_iomap(sun_top_ctrl, 0);
  83         if (!sun_top_ctrl_base) {
  84                 ret = -ENODEV;
  85                 goto out;
  86         }
  87
  88         family_id = readl(sun_top_ctrl_base);
  89         product_id = readl(sun_top_ctrl_base + 0x4);
  90         iounmap(sun_top_ctrl_base);
  91 out:
  92         of_node_put(sun_top_ctrl);
  93         return ret;
  94 }
  95 early_initcall(brcmstb_soc_device_early_init);
  96
  97 static int __init brcmstb_soc_device_init(void)
  98 {
  99         struct soc_device_attribute *soc_dev_attr;
 100         struct device_node *sun_top_ctrl;
 101         struct soc_device *soc_dev;
 102         int ret = 0;
 103
 104         /* We could be on a multi-platform kernel, don't make this fatal but
 105          * bail out early
 106          */
 107         sun_top_ctrl = of_find_matching_node(NULL, sun_top_ctrl_match);
 108         if (!sun_top_ctrl)
 109                 return ret;
 110
 111         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 112         if (!soc_dev_attr) {
 113                 ret = -ENOMEM;
 114                 goto out;
 115         }
 116
 117         soc_dev_attr->family = kasprintf(GFP_KERNEL, "%x",
 118                                          family_id >> 28 ?
 119                                          family_id >> 16 : family_id >> 8);
 120         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%x",
 121                                          product_id >> 28 ?
 122                                          product_id >> 16 : product_id >> 8);
 123         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%c%d",
 124                                          ((product_id & 0xf0) >> 4) + 'A',
 125                                            product_id & 0xf);
 126
 127         soc_dev = soc_device_register(soc_dev_attr);
 128         if (IS_ERR(soc_dev)) {
 129                 kfree(soc_dev_attr->family);
 130                 kfree(soc_dev_attr->soc_id);
 131                 kfree(soc_dev_attr->revision);
 132                 kfree(soc_dev_attr);
 133                 ret = -ENOMEM;
 134         }
 135 out:
 136         of_node_put(sun_top_ctrl);
 137         return ret;
 138 }
 139 arch_initcall(brcmstb_soc_device_init);