cmd/io.c

   1 /*
   2  * Copyright (c) 2012 The Chromium OS Authors.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 /*
   8  * IO space access commands.
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <asm/io.h>
  14
  15 /*
  16  * IO Display
  17  *
  18  * Syntax:
  19  *      iod{.b, .w, .l} {addr}
  20  */
  21 int do_io_iod(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  22 {
  23         ulong addr;
  24         int size;
  25
  26         if (argc != 2)
  27                 return CMD_RET_USAGE;
  28
  29         size = cmd_get_data_size(argv[0], 4);
  30         if (size < 0)
  31                 return 1;
  32
  33         addr = simple_strtoul(argv[1], NULL, 16);
  34
  35         printf("%04x: ", (u16) addr);
  36
  37         if (size == 4)
  38                 printf("%08x\n", inl(addr));
  39         else if (size == 2)
  40                 printf("%04x\n", inw(addr));
  41         else
  42                 printf("%02x\n", inb(addr));
  43
  44         return 0;
  45 }
  46
  47 int do_io_iow(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
  48 {
  49         ulong addr, val;
  50         int size;
  51
  52         if (argc != 3)
  53                 return CMD_RET_USAGE;
  54
  55         size = cmd_get_data_size(argv[0], 4);
  56         if (size < 0)
  57                 return 1;
  58
  59         addr = simple_strtoul(argv[1], NULL, 16);
  60         val = simple_strtoul(argv[2], NULL, 16);
  61
  62         if (size == 4)
  63                 outl((u32) val, addr);
  64         else if (size == 2)
  65                 outw((u16) val, addr);
  66         else
  67                 outb((u8) val, addr);
  68
  69         return 0;
  70 }
  71
  72 /**************************************************/
  73 U_BOOT_CMD(iod, 2, 0, do_io_iod,
  74            "IO space display", "[.b, .w, .l] address");
  75
  76 U_BOOT_CMD(iow, 3, 0, do_io_iow,
  77            "IO space modify",
  78            "[.b, .w, .l] address value");