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 u32 brcmstb_get_family_id(void)
  48 {
  49         return family_id;
  50 }
  51 EXPORT_SYMBOL(brcmstb_get_family_id);
  52
  53 u32 brcmstb_get_product_id(void)
  54 {
  55         return product_id;
  56 }
  57 EXPORT_SYMBOL(brcmstb_get_product_id);
  58
  59 static const struct of_device_id sun_top_ctrl_match[] = {
  60         { .compatible = "brcm,bcm7125-sun-top-ctrl", },
  61         { .compatible = "brcm,bcm7346-sun-top-ctrl", },
  62         { .compatible = "brcm,bcm7358-sun-top-ctrl", },
  63         { .compatible = "brcm,bcm7360-sun-top-ctrl", },
  64         { .compatible = "brcm,bcm7362-sun-top-ctrl", },
  65         { .compatible = "brcm,bcm7420-sun-top-ctrl", },
  66         { .compatible = "brcm,bcm7425-sun-top-ctrl", },
  67         { .compatible = "brcm,bcm7429-sun-top-ctrl", },
  68         { .compatible = "brcm,bcm7435-sun-top-ctrl", },
  69         { .compatible = "brcm,brcmstb-sun-top-ctrl", },
  70         { }
  71 };
  72
  73 static int __init brcmstb_soc_device_early_init(void)
  74 {
  75         struct device_node *sun_top_ctrl;
  76         void __iomem *sun_top_ctrl_base;
  77         int ret = 0;
  78
  79         /* We could be on a multi-platform kernel, don't make this fatal but
  80          * bail out early
  81          */
  82         sun_top_ctrl = of_find_matching_node(NULL, sun_top_ctrl_match);
  83         if (!sun_top_ctrl)
  84                 return ret;
  85
  86         sun_top_ctrl_base = of_iomap(sun_top_ctrl, 0);
  87         if (!sun_top_ctrl_base) {
  88                 ret = -ENODEV;
  89                 goto out;
  90         }
  91
  92         family_id = readl(sun_top_ctrl_base);
  93         product_id = readl(sun_top_ctrl_base + 0x4);
  94         iounmap(sun_top_ctrl_base);
  95 out:
  96         of_node_put(sun_top_ctrl);
  97         return ret;
  98 }
  99 early_initcall(brcmstb_soc_device_early_init);
 100
 101 static int __init brcmstb_soc_device_init(void)
 102 {
 103         struct soc_device_attribute *soc_dev_attr;
 104         struct device_node *sun_top_ctrl;
 105         struct soc_device *soc_dev;
 106         int ret = 0;
 107
 108         /* We could be on a multi-platform kernel, don't make this fatal but
 109          * bail out early
 110          */
 111         sun_top_ctrl = of_find_matching_node(NULL, sun_top_ctrl_match);
 112         if (!sun_top_ctrl)
 113                 return ret;
 114
 115         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 116         if (!soc_dev_attr) {
 117                 ret = -ENOMEM;
 118                 goto out;
 119         }
 120
 121         soc_dev_attr->family = kasprintf(GFP_KERNEL, "%x",
 122                                          family_id >> 28 ?
 123                                          family_id >> 16 : family_id >> 8);
 124         soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%x",
 125                                          product_id >> 28 ?
 126                                          product_id >> 16 : product_id >> 8);
 127         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%c%d",
 128                                          ((product_id & 0xf0) >> 4) + 'A',
 129                                            product_id & 0xf);
 130
 131         soc_dev = soc_device_register(soc_dev_attr);
 132         if (IS_ERR(soc_dev)) {
 133                 kfree(soc_dev_attr->family);
 134                 kfree(soc_dev_attr->soc_id);
 135                 kfree(soc_dev_attr->revision);
 136                 kfree(soc_dev_attr);
 137                 ret = -ENOMEM;
 138         }
 139 out:
 140         of_node_put(sun_top_ctrl);
 141         return ret;
 142 }
 143 arch_initcall(brcmstb_soc_device_init);