Add a 'cpu' command to print CPU information

Add a simple command which provides access to a list of available CPUs along
with descriptions and basic information.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/common/Kconfig b/common/Kconfig
index 5d7e48a5b633e89a913fe7b0eda424db153b7e08..15759f75aa35b2655afd63502aa77a5f055bd227 100644 (file)
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -31,6 +31,14 @@ config CMD_CONSOLE
        help
          Print console devices and information.
 
+config CMD_CPU
+       bool "cpu"
+       help
+         Print information about available CPUs. This normally shows the
+         number of CPUs, type (e.g. manufacturer, architecture, product or
+         internal name) and clock frequency. Other information may be
+         available depending on the CPU driver.
+
 config CMD_LICENSE
        bool "license"
        help

diff --git a/common/Makefile b/common/Makefile
index fba3830f1d2cf19788e42d09dc8ee8d124a39960..9084c73ad9960ed7a03cb4dd1d8e3d18ba78448e 100644 (file)
--- a/common/Makefile
+++ b/common/Makefile
@@ -74,6 +74,7 @@ obj-$(CONFIG_CMD_CBFS) += cmd_cbfs.o
 obj-$(CONFIG_CMD_CLK) += cmd_clk.o
 obj-$(CONFIG_CMD_CONSOLE) += cmd_console.o
 obj-$(CONFIG_CMD_CPLBINFO) += cmd_cplbinfo.o
+obj-$(CONFIG_CMD_CPU) += cmd_cpu.o
 obj-$(CONFIG_DATAFLASH_MMC_SELECT) += cmd_dataflash_mmc_mux.o
 obj-$(CONFIG_CMD_DATE) += cmd_date.o
 obj-$(CONFIG_CMD_DEMO) += cmd_demo.o

diff --git a/common/cmd_cpu.c b/common/cmd_cpu.c
new file mode 100644 (file)
index 0000000..c3e229f
--- /dev/null
+++ b/common/cmd_cpu.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <cpu.h>
+#include <dm.h>
+
+static const char *cpu_feature_name[CPU_FEAT_COUNT] = {
+       "L1 cache",
+       "MMU",
+};
+
+static int print_cpu_list(bool detail)
+{
+       struct udevice *dev;
+       struct uclass *uc;
+       char buf[100];
+       int ret;
+
+       ret = uclass_get(UCLASS_CPU, &uc);
+       if (ret) {
+               printf("Cannot find CPU uclass\n");
+               return ret;
+       }
+       uclass_foreach_dev(dev, uc) {
+               struct cpu_platdata *plat = dev_get_parent_platdata(dev);
+               struct cpu_info info;
+               bool first;
+               int i;
+
+               ret = cpu_get_desc(dev, buf, sizeof(buf));
+               printf("%3d: %-10s %s\n", dev->seq, dev->name,
+                      ret ? "<no description>" : buf);
+               if (!detail)
+                       continue;
+               ret = cpu_get_info(dev, &info);
+               if (ret) {
+                       printf("\t(no detail available");
+                       if (ret != -ENOSYS)
+                               printf(": err=%d\n", ret);
+                       printf(")\n");
+                       continue;
+               }
+               printf("\tID = %d, freq = ", plat->cpu_id);
+               print_freq(info.cpu_freq, "");
+               first = true;
+               for (i = 0; i < CPU_FEAT_COUNT; i++) {
+                       if (info.features & (1 << i)) {
+                               printf("%s%s", first ? ": " : ", ",
+                                      cpu_feature_name[i]);
+                               first = false;
+                       }
+               }
+               printf("\n");
+       }
+
+       return 0;
+}
+
+static int do_cpu_list(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+       if (print_cpu_list(false))
+               return CMD_RET_FAILURE;
+
+       return 0;
+}
+
+static int do_cpu_detail(cmd_tbl_t *cmdtp, int flag, int argc,
+                        char *const argv[])
+{
+       if (print_cpu_list(true))
+               return CMD_RET_FAILURE;
+
+       return 0;
+}
+
+static cmd_tbl_t cmd_cpu_sub[] = {
+       U_BOOT_CMD_MKENT(list, 2, 1, do_cpu_list, "", ""),
+       U_BOOT_CMD_MKENT(detail, 4, 0, do_cpu_detail, "", ""),
+};
+
+/*
+ * Process a cpu sub-command
+ */
+static int do_cpu(cmd_tbl_t *cmdtp, int flag, int argc,
+                      char * const argv[])
+{
+       cmd_tbl_t *c = NULL;
+
+       /* Strip off leading 'cpu' command argument */
+       argc--;
+       argv++;
+
+       if (argc)
+               c = find_cmd_tbl(argv[0], cmd_cpu_sub, ARRAY_SIZE(cmd_cpu_sub));
+
+       if (c)
+               return c->cmd(cmdtp, flag, argc, argv);
+       else
+               return CMD_RET_USAGE;
+}
+
+U_BOOT_CMD(
+       cpu, 2, 1, do_cpu,
+       "display information about CPUs",
+       "list   - list available CPUs\n"
+       "cpu detail     - show CPU detail"
+);