cmd/cpu.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   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 };
  19
  20 static int print_cpu_list(bool detail)
  21 {
  22         struct udevice *dev;
  23         struct uclass *uc;
  24         char buf[100];
  25         int ret;
  26
  27         ret = uclass_get(UCLASS_CPU, &uc);
  28         if (ret) {
  29                 printf("Cannot find CPU uclass\n");
  30                 return ret;
  31         }
  32         uclass_foreach_dev(dev, uc) {
  33                 struct cpu_platdata *plat = dev_get_parent_platdata(dev);
  34                 struct cpu_info info;
  35                 bool first;
  36                 int i;
  37
  38                 ret = cpu_get_desc(dev, buf, sizeof(buf));
  39                 printf("%3d: %-10s %s\n", dev->seq, dev->name,
  40                        ret ? "<no description>" : buf);
  41                 if (!detail)
  42                         continue;
  43                 ret = cpu_get_info(dev, &info);
  44                 if (ret) {
  45                         printf("\t(no detail available");
  46                         if (ret != -ENOSYS)
  47                                 printf(": err=%d\n", ret);
  48                         printf(")\n");
  49                         continue;
  50                 }
  51                 printf("\tID = %d, freq = ", plat->cpu_id);
  52                 print_freq(info.cpu_freq, "");
  53                 first = true;
  54                 for (i = 0; i < CPU_FEAT_COUNT; i++) {
  55                         if (info.features & (1 << i)) {
  56                                 printf("%s%s", first ? ": " : ", ",
  57                                        cpu_feature_name[i]);
  58                                 first = false;
  59                         }
  60                 }
  61                 printf("\n");
  62                 if (info.features & (1 << CPU_FEAT_UCODE)) {
  63                         printf("\tMicrocode version %#x\n",
  64                                plat->ucode_version);
  65                 }
  66                 if (info.features & (1 << CPU_FEAT_DEVICE_ID))
  67                         printf("\tDevice ID %#lx\n", plat->device_id);
  68         }
  69
  70         return 0;
  71 }
  72
  73 static int do_cpu_list(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  74 {
  75         if (print_cpu_list(false))
  76                 return CMD_RET_FAILURE;
  77
  78         return 0;
  79 }
  80
  81 static int do_cpu_detail(cmd_tbl_t *cmdtp, int flag, int argc,
  82                          char *const argv[])
  83 {
  84         if (print_cpu_list(true))
  85                 return CMD_RET_FAILURE;
  86
  87         return 0;
  88 }
  89
  90 static cmd_tbl_t cmd_cpu_sub[] = {
  91         U_BOOT_CMD_MKENT(list, 2, 1, do_cpu_list, "", ""),
  92         U_BOOT_CMD_MKENT(detail, 4, 0, do_cpu_detail, "", ""),
  93 };
  94
  95 /*
  96  * Process a cpu sub-command
  97  */
  98 static int do_cpu(cmd_tbl_t *cmdtp, int flag, int argc,
  99                        char * const argv[])
 100 {
 101         cmd_tbl_t *c = NULL;
 102
 103         /* Strip off leading 'cpu' command argument */
 104         argc--;
 105         argv++;
 106
 107         if (argc)
 108                 c = find_cmd_tbl(argv[0], cmd_cpu_sub, ARRAY_SIZE(cmd_cpu_sub));
 109
 110         if (c)
 111                 return c->cmd(cmdtp, flag, argc, argv);
 112         else
 113                 return CMD_RET_USAGE;
 114 }
 115
 116 U_BOOT_CMD(
 117         cpu, 2, 1, do_cpu,
 118         "display information about CPUs",
 119         "list   - list available CPUs\n"
 120         "cpu detail     - show CPU detail"
 121 );