Add an I/O tracing feature

[people/ms/u-boot.git] / common / cmd_iotrace.c

diff --git a/common/cmd_iotrace.c b/common/cmd_iotrace.c
new file mode 100644 (file)
index 0000000..f54276d
--- /dev/null
+++ b/common/cmd_iotrace.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <iotrace.h>
+
+static void do_print_stats(void)
+{
+       ulong start, size, offset, count;
+
+       printf("iotrace is %sabled\n", iotrace_get_enabled() ? "en" : "dis");
+       iotrace_get_buffer(&start, &size, &offset, &count);
+       printf("Start:  %08lx\n", start);
+       printf("Size:   %08lx\n", size);
+       printf("Offset: %08lx\n", offset);
+       printf("Output: %08lx\n", start + offset);
+       printf("Count:  %08lx\n", count);
+       printf("CRC32:  %08lx\n", (ulong)iotrace_get_checksum());
+}
+
+static int do_set_buffer(int argc, char * const argv[])
+{
+       ulong addr = 0, size = 0;
+
+       if (argc == 2) {
+               addr = simple_strtoul(*argv++, NULL, 16);
+               size = simple_strtoul(*argv++, NULL, 16);
+       } else if (argc != 0) {
+               return CMD_RET_USAGE;
+       }
+
+       iotrace_set_buffer(addr, size);
+
+       return 0;
+}
+
+int do_iotrace(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+       const char *cmd = argc < 2 ? NULL : argv[1];
+
+       if (!cmd)
+               return cmd_usage(cmdtp);
+       switch (*cmd) {
+       case 'b':
+               return do_set_buffer(argc - 2, argv + 2);
+       case 'p':
+               iotrace_set_enabled(0);
+               break;
+       case 'r':
+               iotrace_set_enabled(1);
+               break;
+       case 's':
+               do_print_stats();
+               break;
+       default:
+               return CMD_RET_USAGE;
+       }
+
+       return 0;
+}
+
+U_BOOT_CMD(
+       iotrace,        4,      1,      do_iotrace,
+       "iotrace utility commands",
+       "stats                        - display iotrace stats\n"
+       "iotrace buffer <address> <size>      - set iotrace buffer\n"
+       "iotrace pause                        - pause tracing\n"
+       "iotrace resume                       - resume tracing"
+);