cmd/cpu.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  * Copyright (c) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <cpu.h>
  11 #include <dm.h>
  12 #include <errno.h>
  13
  14 static const char *cpu_feature_name[CPU_FEAT_COUNT] = {
  15         "L1 cache",
  16         "MMU",
  17         "Microcode",
  18         "Device ID",
  19 };
  20
  21 static int print_cpu_list(bool detail)
  22 {
  23         struct udevice *dev;
  24         char buf[100];
  25
  26         for (uclass_first_device(UCLASS_CPU, &dev);
  27                      dev;
  28                      uclass_next_device(&dev)) {
  29                 struct cpu_plat *plat = dev_get_parent_plat(dev);
  30                 struct cpu_info info;
  31                 bool first = true;
  32                 int ret, i;
  33
  34                 ret = cpu_get_desc(dev, buf, sizeof(buf));
  35                 printf("%3d: %-10s %s\n", dev_seq(dev), dev->name,
  36                        ret ? "<no description>" : buf);
  37                 if (!detail)
  38                         continue;
  39                 ret = cpu_get_info(dev, &info);
  40                 if (ret) {
  41                         printf("\t(no detail available");
  42                         if (ret != -ENOSYS)
  43                                 printf(": err=%d", ret);
  44                         printf(")\n");
  45                         continue;
  46                 }
  47                 printf("\tID = %d, freq = ", plat->cpu_id);
  48                 print_freq(info.cpu_freq, "");
  49                 for (i = 0; i < CPU_FEAT_COUNT; i++) {
  50                         if (info.features & (1 << i)) {
  51                                 printf("%s%s", first ? ": " : ", ",
  52                                        cpu_feature_name[i]);
  53                                 first = false;
  54                         }
  55                 }
  56                 printf("\n");
  57                 if (info.features & (1 << CPU_FEAT_UCODE))
  58                         printf("\tMicrocode version %#x\n",
  59                                plat->ucode_version);
  60                 if (info.features & (1 << CPU_FEAT_DEVICE_ID))
  61                         printf("\tDevice ID %#lx\n", plat->device_id);
  62         }
  63
  64         return 0;
  65 }
  66
  67 static int do_cpu_list(struct cmd_tbl *cmdtp, int flag, int argc,
  68                        char *const argv[])
  69 {
  70         if (print_cpu_list(false))
  71                 return CMD_RET_FAILURE;
  72
  73         return 0;
  74 }
  75
  76 static int do_cpu_detail(struct cmd_tbl *cmdtp, int flag, int argc,
  77                          char *const argv[])
  78 {
  79         if (print_cpu_list(true))
  80                 return CMD_RET_FAILURE;
  81
  82         return 0;
  83 }
  84
  85 #if CONFIG_IS_ENABLED(SYS_LONGHELP)
  86 static char cpu_help_text[] =
  87         "list   - list available CPUs\n"
  88         "cpu detail     - show CPU detail"
  89         ;
  90 #endif
  91
  92 U_BOOT_CMD_WITH_SUBCMDS(cpu, "display information about CPUs", cpu_help_text,
  93         U_BOOT_SUBCMD_MKENT(list, 1, 1, do_cpu_list),
  94         U_BOOT_SUBCMD_MKENT(detail, 1, 0, do_cpu_detail));