src/soc/amd/picasso/reset.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <arch/io.h>
  16 #include <reset.h>
  17 #include <soc/northbridge.h>
  18 #include <soc/pci_devs.h>
  19 #include <device/pci_ops.h>
  20 #include <soc/southbridge.h>
  21 #include <amdblocks/acpimmio.h>
  22 #include <amdblocks/reset.h>
  23
  24 void set_warm_reset_flag(void)
  25 {
  26         uint8_t ncp = inw(NCP_ERR);
  27
  28         outb(NCP_ERR, ncp | NCP_WARM_BOOT);
  29 }
  30
  31 int is_warm_reset(void)
  32 {
  33         return !!(inb(NCP_ERR) & NCP_WARM_BOOT);
  34 }
  35
  36 void do_cold_reset(void)
  37 {
  38         /* De-assert and then assert all PwrGood signals on CF9 reset. */
  39         pm_write16(PWR_RESET_CFG, pm_read16(PWR_RESET_CFG) |
  40                 TOGGLE_ALL_PWR_GOOD);
  41         outb(RST_CMD | SYS_RST, SYS_RESET);
  42 }
  43
  44 void do_warm_reset(void)
  45 {
  46         set_warm_reset_flag();
  47
  48         /* Assert reset signals only. */
  49         outb(RST_CMD | SYS_RST, SYS_RESET);
  50 }
  51
  52 void do_board_reset(void)
  53 {
  54         /* TODO: Would a warm_reset() suffice? */
  55         do_cold_reset();
  56 }