arch/x86/cpu/cpu_x86.c

   1 /*
   2  * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <cpu.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <asm/cpu.h>
  12
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 int cpu_x86_bind(struct udevice *dev)
  16 {
  17         struct cpu_platdata *plat = dev_get_parent_platdata(dev);
  18
  19         plat->cpu_id = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
  20                                       "intel,apic-id", -1);
  21
  22         return 0;
  23 }
  24
  25 int cpu_x86_get_desc(struct udevice *dev, char *buf, int size)
  26 {
  27         if (size < CPU_MAX_NAME_LEN)
  28                 return -ENOSPC;
  29
  30         cpu_get_name(buf);
  31
  32         return 0;
  33 }
  34
  35 static int cpu_x86_get_count(struct udevice *dev)
  36 {
  37         int node, cpu;
  38         int num = 0;
  39
  40         node = fdt_path_offset(gd->fdt_blob, "/cpus");
  41         if (node < 0)
  42                 return -ENOENT;
  43
  44         for (cpu = fdt_first_subnode(gd->fdt_blob, node);
  45              cpu >= 0;
  46              cpu = fdt_next_subnode(gd->fdt_blob, cpu)) {
  47                 const char *device_type;
  48
  49                 device_type = fdt_getprop(gd->fdt_blob, cpu,
  50                                           "device_type", NULL);
  51                 if (!device_type)
  52                         continue;
  53                 if (strcmp(device_type, "cpu") == 0)
  54                         num++;
  55         }
  56
  57         return num;
  58 }
  59
  60 static const struct cpu_ops cpu_x86_ops = {
  61         .get_desc       = cpu_x86_get_desc,
  62         .get_count      = cpu_x86_get_count,
  63 };
  64
  65 static const struct udevice_id cpu_x86_ids[] = {
  66         { .compatible = "cpu-x86" },
  67         { }
  68 };
  69
  70 U_BOOT_DRIVER(cpu_x86_drv) = {
  71         .name           = "cpu_x86",
  72         .id             = UCLASS_CPU,
  73         .of_match       = cpu_x86_ids,
  74         .bind           = cpu_x86_bind,
  75         .ops            = &cpu_x86_ops,
  76 };