cmd/cpu.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  * Copyright (c) 2017 Álvaro Fernández Rojas <noltari@gmail.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <command.h>
  11 #include <cpu.h>
  12 #include <dm.h>
  13 #include <errno.h>
  14
  15 static const char *cpu_feature_name[CPU_FEAT_COUNT] = {
  16         "L1 cache",
  17         "MMU",
  18         "Microcode",
  19         "Device ID",
  20 };
  21
  22 static int print_cpu_list(bool detail)
  23 {
  24         struct udevice *dev;
  25         char buf[100];
  26
  27         for (uclass_first_device(UCLASS_CPU, &dev);
  28                      dev;
  29                      uclass_next_device(&dev)) {
  30                 struct cpu_platdata *plat = dev_get_parent_platdata(dev);
  31                 struct cpu_info info;
  32                 bool first = true;
  33                 int ret, i;
  34
  35                 ret = cpu_get_desc(dev, buf, sizeof(buf));
  36                 printf("%3d: %-10s %s\n", dev->seq, dev->name,
  37                        ret ? "<no description>" : buf);
  38                 if (!detail)
  39                         continue;
  40                 ret = cpu_get_info(dev, &info);
  41                 if (ret) {
  42                         printf("\t(no detail available");
  43                         if (ret != -ENOSYS)
  44                                 printf(": err=%d", ret);
  45                         printf(")\n");
  46                         continue;
  47                 }
  48                 printf("\tID = %d, freq = ", plat->cpu_id);
  49                 print_freq(info.cpu_freq, "");
  50                 for (i = 0; i < CPU_FEAT_COUNT; i++) {
  51                         if (info.features & (1 << i)) {
  52                                 printf("%s%s", first ? ": " : ", ",
  53                                        cpu_feature_name[i]);
  54                                 first = false;
  55                         }
  56                 }
  57                 printf("\n");
  58                 if (info.features & (1 << CPU_FEAT_UCODE))
  59                         printf("\tMicrocode version %#x\n",
  60                                plat->ucode_version);
  61                 if (info.features & (1 << CPU_FEAT_DEVICE_ID))
  62                         printf("\tDevice ID %#lx\n", plat->device_id);
  63         }
  64
  65         return 0;
  66 }
  67
  68 static int do_cpu_list(cmd_tbl_t *cmdtp, int flag, int argc,
  69                        char *const argv[])
  70 {
  71         if (print_cpu_list(false))
  72                 return CMD_RET_FAILURE;
  73
  74         return 0;
  75 }
  76
  77 static int do_cpu_detail(cmd_tbl_t *cmdtp, int flag, int argc,
  78                          char *const argv[])
  79 {
  80         if (print_cpu_list(true))
  81                 return CMD_RET_FAILURE;
  82
  83         return 0;
  84 }
  85
  86 static cmd_tbl_t cmd_cpu_sub[] = {
  87         U_BOOT_CMD_MKENT(list, 2, 1, do_cpu_list, "", ""),
  88         U_BOOT_CMD_MKENT(detail, 4, 0, do_cpu_detail, "", ""),
  89 };
  90
  91 /*
  92  * Process a cpu sub-command
  93  */
  94 static int do_cpu(cmd_tbl_t *cmdtp, int flag, int argc,
  95                   char * const argv[])
  96 {
  97         cmd_tbl_t *c = NULL;
  98
  99         /* Strip off leading 'cpu' command argument */
 100         argc--;
 101         argv++;
 102
 103         if (argc)
 104                 c = find_cmd_tbl(argv[0], cmd_cpu_sub,
 105                                  ARRAY_SIZE(cmd_cpu_sub));
 106
 107         if (c)
 108                 return c->cmd(cmdtp, flag, argc, argv);
 109         else
 110                 return CMD_RET_USAGE;
 111 }
 112
 113 U_BOOT_CMD(
 114         cpu, 2, 1, do_cpu,
 115         "display information about CPUs",
 116         "list   - list available CPUs\n"
 117         "cpu detail     - show CPU detail"
 118 );