util/superiotool/via.c

   1 /*
   2  * This file is part of the superiotool project.
   3  *
   4  * Copyright (C) 2009 Carl-Daniel Hailfinger
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "superiotool.h"
  22
  23 #define DEVICE_ID_VT82C686_REG  0xe0
  24 #define DEVICE_REV_VT82C686_REG 0xe1
  25
  26 static const struct superio_registers reg_table[] = {
  27         {0x3c, "VT82C686A/VT82C686B", {
  28                 {EOT}}},
  29         {EOT}
  30 };
  31
  32 static uint8_t vt82c686_conf = 0;
  33
  34 static int enter_conf_mode_via_vt82c686(void)
  35 {
  36         struct pci_dev *dev;
  37
  38         dev = pci_dev_find(0x1106, 0x0686);
  39         if (!dev) {
  40                 if (verbose)
  41                         printf("  PCI device 1106:0686 not found.\n");
  42                 return 1;
  43         }
  44
  45         vt82c686_conf = pci_read_byte(dev, 0x85);
  46         if (verbose)
  47                 printf("  Super I/O %sabled, Super I/O configuration %sabled\n",
  48                        (vt82c686_conf & (1 << 0)) ? "en" : "dis",
  49                        (vt82c686_conf & (1 << 1)) ? "en" : "dis");
  50
  51         /* If the Super I/O is not enabled, skip it. */
  52         if (!(vt82c686_conf & (1 << 0)))
  53                 return 1;
  54
  55         /* Enable Super I/O configuration mode. */
  56         pci_write_byte(dev, 0x85, vt82c686_conf | (1 << 1));
  57
  58         return 0;
  59 }
  60
  61 static void exit_conf_mode_via_vt82c686(void)
  62 {
  63         struct pci_dev *dev;
  64
  65         dev = pci_dev_find(0x1106, 0x0686);
  66         if (!dev) {
  67                 printf("Bug: PCI device 1106:0686 not found during shutdown.\n"
  68                        "Please report to coreboot@coreboot.org.\n");
  69                 return;
  70         }
  71
  72         /* Restore (disable?) Super I/O configuration mode setting. */
  73         pci_write_byte(dev, 0x85, vt82c686_conf);
  74 }
  75
  76 void probe_idregs_via(uint16_t port)
  77 {
  78         uint16_t id;
  79         uint8_t rev;
  80
  81         probing_for("VIA", "", port);
  82
  83         if (enter_conf_mode_via_vt82c686())
  84                 return;
  85
  86         id = regval(port, DEVICE_ID_VT82C686_REG);
  87         rev = regval(port, DEVICE_REV_VT82C686_REG);
  88
  89         if (superio_unknown(reg_table, id)) {
  90                 if (verbose)
  91                         printf(NOTFOUND "id=0x%04x, rev=0x%02x\n", id, rev);
  92                 exit_conf_mode_via_vt82c686();
  93                 return;
  94         }
  95
  96         printf("Found VIA %s (id=0x%04x, rev=0x%02x) at 0x%x\n",
  97                get_superio_name(reg_table, id), id, rev, port);
  98         chip_found = 1;
  99
 100         exit_conf_mode_via_vt82c686();
 101 }
 102
 103 void print_via_chips(void)
 104 {
 105         print_vendor_chips("VIA", reg_table);
 106 }