drivers/mfd/rtsx_gops.c

   1 /* Driver for Realtek PCI-Express card reader
   2  *
   3  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2, or (at your option) any
   8  * later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author:
  19  *   Micky Ching <micky_ching@realsil.com.cn>
  20  */
  21
  22 #include <linux/mfd/rtsx_pci.h>
  23 #include "rtsx_pcr.h"
  24
  25 int rtsx_gops_pm_reset(struct rtsx_pcr *pcr)
  26 {
  27         int err;
  28
  29         /* init aspm */
  30         rtsx_pci_write_register(pcr, ASPM_FORCE_CTL, 0xFF, 0x00);
  31         err = rtsx_pci_update_cfg_byte(pcr, LCTLR, ~LCTLR_ASPM_CTL_MASK, 0x00);
  32         if (err < 0)
  33                 return err;
  34
  35         /* reset PM_CTRL3 before send buffer cmd */
  36         return rtsx_pci_write_register(pcr, PM_CTRL3, D3_DELINK_MODE_EN, 0x00);
  37 }