board/imgtec/malta/superio.c

   1 /*
   2  * Copyright (C) 2013 Imagination Technologies
   3  * Author: Paul Burton <paul.burton@imgtec.com>
   4  *
   5  * Setup code for the FDC37M817 super I/O controller
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <asm/io.h>
  12
  13 #define SIO_CONF_PORT           0x3f0
  14 #define SIO_DATA_PORT           0x3f1
  15
  16 enum sio_conf_key {
  17         SIOCONF_DEVNUM          = 0x07,
  18         SIOCONF_ACTIVATE        = 0x30,
  19         SIOCONF_ENTER_SETUP     = 0x55,
  20         SIOCONF_BASE_HIGH       = 0x60,
  21         SIOCONF_BASE_LOW        = 0x61,
  22         SIOCONF_PRIMARY_INT     = 0x70,
  23         SIOCONF_EXIT_SETUP      = 0xaa,
  24         SIOCONF_MODE            = 0xf0,
  25 };
  26
  27 static struct {
  28         u8 key;
  29         u8 data;
  30 } sio_config[] = {
  31         /* tty0 */
  32         { SIOCONF_DEVNUM,       0x04 },
  33         { SIOCONF_BASE_HIGH,    0x03 },
  34         { SIOCONF_BASE_LOW,     0xf8 },
  35         { SIOCONF_MODE,         0x02 },
  36         { SIOCONF_PRIMARY_INT,  0x04 },
  37         { SIOCONF_ACTIVATE,     0x01 },
  38
  39         /* tty1 */
  40         { SIOCONF_DEVNUM,       0x05 },
  41         { SIOCONF_BASE_HIGH,    0x02 },
  42         { SIOCONF_BASE_LOW,     0xf8 },
  43         { SIOCONF_MODE,         0x02 },
  44         { SIOCONF_PRIMARY_INT,  0x03 },
  45         { SIOCONF_ACTIVATE,     0x01 },
  46 };
  47
  48 void malta_superio_init(void)
  49 {
  50         unsigned i;
  51
  52         /* enter config state */
  53         outb(SIOCONF_ENTER_SETUP, SIO_CONF_PORT);
  54
  55         /* configure peripherals */
  56         for (i = 0; i < ARRAY_SIZE(sio_config); i++) {
  57                 outb(sio_config[i].key, SIO_CONF_PORT);
  58                 outb(sio_config[i].data, SIO_DATA_PORT);
  59         }
  60
  61         /* exit config state */
  62         outb(SIOCONF_EXIT_SETUP, SIO_CONF_PORT);
  63 }