cmd/io.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2012 The Chromium OS Authors.
   4  */
   5
   6 /*
   7  * IO space access commands.
   8  */
   9
  10 #include <common.h>
  11 #include <command.h>
  12 #include <display_options.h>
  13 #include <asm/io.h>
  14
  15 /* Display values from last command */
  16 static ulong last_addr, last_size;
  17 static ulong last_length = 0x40;
  18 static ulong base_address;
  19
  20 #define DISP_LINE_LEN   16
  21
  22 /*
  23  * IO Display
  24  *
  25  * Syntax:
  26  *      iod{.b, .w, .l} {addr}
  27  */
  28 int do_io_iod(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  29 {
  30         ulong addr, length, bytes;
  31         u8 buf[DISP_LINE_LEN];
  32         int size, todo;
  33
  34         /*
  35          * We use the last specified parameters, unless new ones are
  36          * entered.
  37          */
  38         addr = last_addr;
  39         size = last_size;
  40         length = last_length;
  41
  42         if (argc < 2)
  43                 return CMD_RET_USAGE;
  44
  45         if ((flag & CMD_FLAG_REPEAT) == 0) {
  46                 /*
  47                  * New command specified.  Check for a size specification.
  48                  * Defaults to long if no or incorrect specification.
  49                  */
  50                 size = cmd_get_data_size(argv[0], 4);
  51                 if (size < 0)
  52                         return 1;
  53
  54                 /* Address is specified since argc > 1 */
  55                 addr = hextoul(argv[1], NULL);
  56                 addr += base_address;
  57
  58                 /*
  59                  * If another parameter, it is the length to display.
  60                  * Length is the number of objects, not number of bytes.
  61                  */
  62                 if (argc > 2)
  63                         length = hextoul(argv[2], NULL);
  64         }
  65
  66         bytes = size * length;
  67
  68         /* Print the lines */
  69         for (; bytes > 0; addr += todo) {
  70                 u8 *ptr = buf;
  71                 int i;
  72
  73                 todo = min(bytes, (ulong)DISP_LINE_LEN);
  74                 for (i = 0; i < todo; i += size, ptr += size) {
  75                         if (size == 4)
  76                                 *(u32 *)ptr = inl(addr + i);
  77                         else if (size == 2)
  78                                 *(u16 *)ptr = inw(addr + i);
  79                         else
  80                                 *ptr = inb(addr + i);
  81                 }
  82                 print_buffer(addr, buf, size, todo / size,
  83                              DISP_LINE_LEN / size);
  84                 bytes -= todo;
  85         }
  86
  87         last_addr = addr;
  88         last_length = length;
  89         last_size = size;
  90
  91         return 0;
  92 }
  93
  94 int do_io_iow(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  95 {
  96         ulong addr, val;
  97         int size;
  98
  99         if (argc != 3)
 100                 return CMD_RET_USAGE;
 101
 102         size = cmd_get_data_size(argv[0], 4);
 103         if (size < 0)
 104                 return 1;
 105
 106         addr = hextoul(argv[1], NULL);
 107         val = hextoul(argv[2], NULL);
 108
 109         if (size == 4)
 110                 outl((u32) val, addr);
 111         else if (size == 2)
 112                 outw((u16) val, addr);
 113         else
 114                 outb((u8) val, addr);
 115
 116         return 0;
 117 }
 118
 119 /**************************************************/
 120 U_BOOT_CMD(iod, 3, 1, do_io_iod,
 121            "IO space display", "[.b, .w, .l] address");
 122
 123 U_BOOT_CMD(iow, 3, 0, do_io_iow,
 124            "IO space modify",
 125            "[.b, .w, .l] address value");