drivers/mfd/rtl8411.c

   1 /* Driver for Realtek PCI-Express card reader
   2  *
   3  * Copyright(c) 2009 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  *   Wei WANG <wei_wang@realsil.com.cn>
  20  *   No. 450, Shenhu Road, Suzhou Industry Park, Suzhou, China
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/bitops.h>
  25 #include <linux/delay.h>
  26 #include <linux/mfd/rtsx_pci.h>
  27
  28 #include "rtsx_pcr.h"
  29
  30 static u8 rtl8411_get_ic_version(struct rtsx_pcr *pcr)
  31 {
  32         u8 val;
  33
  34         rtsx_pci_read_register(pcr, SYS_VER, &val);
  35         return val & 0x0F;
  36 }
  37
  38 static int rtl8411_extra_init_hw(struct rtsx_pcr *pcr)
  39 {
  40         return rtsx_pci_write_register(pcr, CD_PAD_CTL,
  41                         CD_DISABLE_MASK | CD_AUTO_DISABLE, CD_ENABLE);
  42 }
  43
  44 static int rtl8411_turn_on_led(struct rtsx_pcr *pcr)
  45 {
  46         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
  47 }
  48
  49 static int rtl8411_turn_off_led(struct rtsx_pcr *pcr)
  50 {
  51         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
  52 }
  53
  54 static int rtl8411_enable_auto_blink(struct rtsx_pcr *pcr)
  55 {
  56         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
  57 }
  58
  59 static int rtl8411_disable_auto_blink(struct rtsx_pcr *pcr)
  60 {
  61         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
  62 }
  63
  64 static int rtl8411_card_power_on(struct rtsx_pcr *pcr, int card)
  65 {
  66         int err;
  67
  68         rtsx_pci_init_cmd(pcr);
  69         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
  70                         BPP_POWER_MASK, BPP_POWER_5_PERCENT_ON);
  71         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_CTL,
  72                         BPP_LDO_POWB, BPP_LDO_SUSPEND);
  73         err = rtsx_pci_send_cmd(pcr, 100);
  74         if (err < 0)
  75                 return err;
  76
  77         /* To avoid too large in-rush current */
  78         udelay(150);
  79
  80         err = rtsx_pci_write_register(pcr, CARD_PWR_CTL,
  81                         BPP_POWER_MASK, BPP_POWER_10_PERCENT_ON);
  82         if (err < 0)
  83                 return err;
  84
  85         udelay(150);
  86
  87         err = rtsx_pci_write_register(pcr, CARD_PWR_CTL,
  88                         BPP_POWER_MASK, BPP_POWER_15_PERCENT_ON);
  89         if (err < 0)
  90                 return err;
  91
  92         udelay(150);
  93
  94         err = rtsx_pci_write_register(pcr, CARD_PWR_CTL,
  95                         BPP_POWER_MASK, BPP_POWER_ON);
  96         if (err < 0)
  97                 return err;
  98
  99         return rtsx_pci_write_register(pcr, LDO_CTL, BPP_LDO_POWB, BPP_LDO_ON);
 100 }
 101
 102 static int rtl8411_card_power_off(struct rtsx_pcr *pcr, int card)
 103 {
 104         int err;
 105
 106         err = rtsx_pci_write_register(pcr, CARD_PWR_CTL,
 107                         BPP_POWER_MASK, BPP_POWER_OFF);
 108         if (err < 0)
 109                 return err;
 110
 111         return rtsx_pci_write_register(pcr, LDO_CTL,
 112                         BPP_LDO_POWB, BPP_LDO_SUSPEND);
 113 }
 114
 115 static unsigned int rtl8411_cd_deglitch(struct rtsx_pcr *pcr)
 116 {
 117         unsigned int card_exist;
 118
 119         card_exist = rtsx_pci_readl(pcr, RTSX_BIPR);
 120         card_exist &= CARD_EXIST;
 121         if (!card_exist) {
 122                 /* Enable card CD */
 123                 rtsx_pci_write_register(pcr, CD_PAD_CTL,
 124                                 CD_DISABLE_MASK, CD_ENABLE);
 125                 /* Enable card interrupt */
 126                 rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x00);
 127                 return 0;
 128         }
 129
 130         if (hweight32(card_exist) > 1) {
 131                 rtsx_pci_write_register(pcr, CARD_PWR_CTL,
 132                                 BPP_POWER_MASK, BPP_POWER_5_PERCENT_ON);
 133                 msleep(100);
 134
 135                 card_exist = rtsx_pci_readl(pcr, RTSX_BIPR);
 136                 if (card_exist & MS_EXIST)
 137                         card_exist = MS_EXIST;
 138                 else if (card_exist & SD_EXIST)
 139                         card_exist = SD_EXIST;
 140                 else
 141                         card_exist = 0;
 142
 143                 rtsx_pci_write_register(pcr, CARD_PWR_CTL,
 144                                 BPP_POWER_MASK, BPP_POWER_OFF);
 145
 146                 dev_dbg(&(pcr->pci->dev),
 147                                 "After CD deglitch, card_exist = 0x%x\n",
 148                                 card_exist);
 149         }
 150
 151         if (card_exist & MS_EXIST) {
 152                 /* Disable SD interrupt */
 153                 rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x40);
 154                 rtsx_pci_write_register(pcr, CD_PAD_CTL,
 155                                 CD_DISABLE_MASK, MS_CD_EN_ONLY);
 156         } else if (card_exist & SD_EXIST) {
 157                 /* Disable MS interrupt */
 158                 rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x80);
 159                 rtsx_pci_write_register(pcr, CD_PAD_CTL,
 160                                 CD_DISABLE_MASK, SD_CD_EN_ONLY);
 161         }
 162
 163         return card_exist;
 164 }
 165
 166 static const struct pcr_ops rtl8411_pcr_ops = {
 167         .extra_init_hw = rtl8411_extra_init_hw,
 168         .optimize_phy = NULL,
 169         .turn_on_led = rtl8411_turn_on_led,
 170         .turn_off_led = rtl8411_turn_off_led,
 171         .enable_auto_blink = rtl8411_enable_auto_blink,
 172         .disable_auto_blink = rtl8411_disable_auto_blink,
 173         .card_power_on = rtl8411_card_power_on,
 174         .card_power_off = rtl8411_card_power_off,
 175         .cd_deglitch = rtl8411_cd_deglitch,
 176 };
 177
 178 /* SD Pull Control Enable:
 179  *     SD_DAT[3:0] ==> pull up
 180  *     SD_CD       ==> pull up
 181  *     SD_WP       ==> pull up
 182  *     SD_CMD      ==> pull up
 183  *     SD_CLK      ==> pull down
 184  */
 185 static const u32 rtl8411_sd_pull_ctl_enable_tbl[] = {
 186         RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
 187         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 188         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xA9),
 189         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
 190         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x09),
 191         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 192         0,
 193 };
 194
 195 /* SD Pull Control Disable:
 196  *     SD_DAT[3:0] ==> pull down
 197  *     SD_CD       ==> pull up
 198  *     SD_WP       ==> pull down
 199  *     SD_CMD      ==> pull down
 200  *     SD_CLK      ==> pull down
 201  */
 202 static const u32 rtl8411_sd_pull_ctl_disable_tbl[] = {
 203         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
 204         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 205         RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
 206         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
 207         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
 208         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 209         0,
 210 };
 211
 212 /* MS Pull Control Enable:
 213  *     MS CD       ==> pull up
 214  *     others      ==> pull down
 215  */
 216 static const u32 rtl8411_ms_pull_ctl_enable_tbl[] = {
 217         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
 218         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 219         RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
 220         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x05),
 221         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
 222         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 223         0,
 224 };
 225
 226 /* MS Pull Control Disable:
 227  *     MS CD       ==> pull up
 228  *     others      ==> pull down
 229  */
 230 static const u32 rtl8411_ms_pull_ctl_disable_tbl[] = {
 231         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
 232         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 233         RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
 234         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
 235         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
 236         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 237         0,
 238 };
 239
 240 void rtl8411_init_params(struct rtsx_pcr *pcr)
 241 {
 242         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 243         pcr->num_slots = 2;
 244         pcr->ops = &rtl8411_pcr_ops;
 245
 246         pcr->ic_version = rtl8411_get_ic_version(pcr);
 247         pcr->sd_pull_ctl_enable_tbl = rtl8411_sd_pull_ctl_enable_tbl;
 248         pcr->sd_pull_ctl_disable_tbl = rtl8411_sd_pull_ctl_disable_tbl;
 249         pcr->ms_pull_ctl_enable_tbl = rtl8411_ms_pull_ctl_enable_tbl;
 250         pcr->ms_pull_ctl_disable_tbl = rtl8411_ms_pull_ctl_disable_tbl;
 251 }