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