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 };
  18
  19 static int print_cpu_list(bool detail)
  20 {
  21         struct udevice *dev;
  22         struct uclass *uc;
  23         char buf[100];
  24         int ret;
  25
  26         ret = uclass_get(UCLASS_CPU, &uc);
  27         if (ret) {
  28                 printf("Cannot find CPU uclass\n");
  29                 return ret;
  30         }
  31         uclass_foreach_dev(dev, uc) {
  32                 struct cpu_platdata *plat = dev_get_parent_platdata(dev);
  33                 struct cpu_info info;
  34                 bool first;
  35                 int i;
  36
  37                 ret = cpu_get_desc(dev, buf, sizeof(buf));
  38                 printf("%3d: %-10s %s\n", dev->seq, dev->name,
  39                        ret ? "<no description>" : buf);
  40                 if (!detail)
  41                         continue;
  42                 ret = cpu_get_info(dev, &info);
  43                 if (ret) {
  44                         printf("\t(no detail available");
  45                         if (ret != -ENOSYS)
  46                                 printf(": err=%d\n", ret);
  47                         printf(")\n");
  48                         continue;
  49                 }
  50                 printf("\tID = %d, freq = ", plat->cpu_id);
  51                 print_freq(info.cpu_freq, "");
  52                 first = true;
  53                 for (i = 0; i < CPU_FEAT_COUNT; i++) {
  54                         if (info.features & (1 << i)) {
  55                                 printf("%s%s", first ? ": " : ", ",
  56                                        cpu_feature_name[i]);
  57                                 first = false;
  58                         }
  59                 }
  60                 printf("\n");
  61         }
  62
  63         return 0;
  64 }
  65
  66 static int do_cpu_list(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  67 {
  68         if (print_cpu_list(false))
  69                 return CMD_RET_FAILURE;
  70
  71         return 0;
  72 }
  73
  74 static int do_cpu_detail(cmd_tbl_t *cmdtp, int flag, int argc,
  75                          char *const argv[])
  76 {
  77         if (print_cpu_list(true))
  78                 return CMD_RET_FAILURE;
  79
  80         return 0;
  81 }
  82
  83 static cmd_tbl_t cmd_cpu_sub[] = {
  84         U_BOOT_CMD_MKENT(list, 2, 1, do_cpu_list, "", ""),
  85         U_BOOT_CMD_MKENT(detail, 4, 0, do_cpu_detail, "", ""),
  86 };
  87
  88 /*
  89  * Process a cpu sub-command
  90  */
  91 static int do_cpu(cmd_tbl_t *cmdtp, int flag, int argc,
  92                        char * const argv[])
  93 {
  94         cmd_tbl_t *c = NULL;
  95
  96         /* Strip off leading 'cpu' command argument */
  97         argc--;
  98         argv++;
  99
 100         if (argc)
 101                 c = find_cmd_tbl(argv[0], cmd_cpu_sub, ARRAY_SIZE(cmd_cpu_sub));
 102
 103         if (c)
 104                 return c->cmd(cmdtp, flag, argc, argv);
 105         else
 106                 return CMD_RET_USAGE;
 107 }
 108
 109 U_BOOT_CMD(
 110         cpu, 2, 1, do_cpu,
 111         "display information about CPUs",
 112         "list   - list available CPUs\n"
 113         "cpu detail     - show CPU detail"
 114 );