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 int rtl8411_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 116 {
 117         u8 mask, val;
 118
 119         mask = (BPP_REG_TUNED18 << BPP_TUNED18_SHIFT_8411) | BPP_PAD_MASK;
 120         if (voltage == OUTPUT_3V3)
 121                 val = (BPP_ASIC_3V3 << BPP_TUNED18_SHIFT_8411) | BPP_PAD_3V3;
 122         else if (voltage == OUTPUT_1V8)
 123                 val = (BPP_ASIC_1V8 << BPP_TUNED18_SHIFT_8411) | BPP_PAD_1V8;
 124         else
 125                 return -EINVAL;
 126
 127         return rtsx_pci_write_register(pcr, LDO_CTL, mask, val);
 128 }
 129
 130 static unsigned int rtl8411_cd_deglitch(struct rtsx_pcr *pcr)
 131 {
 132         unsigned int card_exist;
 133
 134         card_exist = rtsx_pci_readl(pcr, RTSX_BIPR);
 135         card_exist &= CARD_EXIST;
 136         if (!card_exist) {
 137                 /* Enable card CD */
 138                 rtsx_pci_write_register(pcr, CD_PAD_CTL,
 139                                 CD_DISABLE_MASK, CD_ENABLE);
 140                 /* Enable card interrupt */
 141                 rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x00);
 142                 return 0;
 143         }
 144
 145         if (hweight32(card_exist) > 1) {
 146                 rtsx_pci_write_register(pcr, CARD_PWR_CTL,
 147                                 BPP_POWER_MASK, BPP_POWER_5_PERCENT_ON);
 148                 msleep(100);
 149
 150                 card_exist = rtsx_pci_readl(pcr, RTSX_BIPR);
 151                 if (card_exist & MS_EXIST)
 152                         card_exist = MS_EXIST;
 153                 else if (card_exist & SD_EXIST)
 154                         card_exist = SD_EXIST;
 155                 else
 156                         card_exist = 0;
 157
 158                 rtsx_pci_write_register(pcr, CARD_PWR_CTL,
 159                                 BPP_POWER_MASK, BPP_POWER_OFF);
 160
 161                 dev_dbg(&(pcr->pci->dev),
 162                                 "After CD deglitch, card_exist = 0x%x\n",
 163                                 card_exist);
 164         }
 165
 166         if (card_exist & MS_EXIST) {
 167                 /* Disable SD interrupt */
 168                 rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x40);
 169                 rtsx_pci_write_register(pcr, CD_PAD_CTL,
 170                                 CD_DISABLE_MASK, MS_CD_EN_ONLY);
 171         } else if (card_exist & SD_EXIST) {
 172                 /* Disable MS interrupt */
 173                 rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x80);
 174                 rtsx_pci_write_register(pcr, CD_PAD_CTL,
 175                                 CD_DISABLE_MASK, SD_CD_EN_ONLY);
 176         }
 177
 178         return card_exist;
 179 }
 180
 181 static const struct pcr_ops rtl8411_pcr_ops = {
 182         .extra_init_hw = rtl8411_extra_init_hw,
 183         .optimize_phy = NULL,
 184         .turn_on_led = rtl8411_turn_on_led,
 185         .turn_off_led = rtl8411_turn_off_led,
 186         .enable_auto_blink = rtl8411_enable_auto_blink,
 187         .disable_auto_blink = rtl8411_disable_auto_blink,
 188         .card_power_on = rtl8411_card_power_on,
 189         .card_power_off = rtl8411_card_power_off,
 190         .switch_output_voltage = rtl8411_switch_output_voltage,
 191         .cd_deglitch = rtl8411_cd_deglitch,
 192 };
 193
 194 /* SD Pull Control Enable:
 195  *     SD_DAT[3:0] ==> pull up
 196  *     SD_CD       ==> pull up
 197  *     SD_WP       ==> pull up
 198  *     SD_CMD      ==> pull up
 199  *     SD_CLK      ==> pull down
 200  */
 201 static const u32 rtl8411_sd_pull_ctl_enable_tbl[] = {
 202         RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
 203         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 204         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xA9),
 205         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
 206         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x09),
 207         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 208         0,
 209 };
 210
 211 /* SD Pull Control Disable:
 212  *     SD_DAT[3:0] ==> pull down
 213  *     SD_CD       ==> pull up
 214  *     SD_WP       ==> pull down
 215  *     SD_CMD      ==> pull down
 216  *     SD_CLK      ==> pull down
 217  */
 218 static const u32 rtl8411_sd_pull_ctl_disable_tbl[] = {
 219         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
 220         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 221         RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
 222         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
 223         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
 224         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 225         0,
 226 };
 227
 228 /* MS Pull Control Enable:
 229  *     MS CD       ==> pull up
 230  *     others      ==> pull down
 231  */
 232 static const u32 rtl8411_ms_pull_ctl_enable_tbl[] = {
 233         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
 234         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 235         RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
 236         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x05),
 237         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
 238         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 239         0,
 240 };
 241
 242 /* MS Pull Control Disable:
 243  *     MS CD       ==> pull up
 244  *     others      ==> pull down
 245  */
 246 static const u32 rtl8411_ms_pull_ctl_disable_tbl[] = {
 247         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
 248         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 249         RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
 250         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
 251         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
 252         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 253         0,
 254 };
 255
 256 void rtl8411_init_params(struct rtsx_pcr *pcr)
 257 {
 258         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 259         pcr->num_slots = 2;
 260         pcr->ops = &rtl8411_pcr_ops;
 261
 262         pcr->ic_version = rtl8411_get_ic_version(pcr);
 263         pcr->sd_pull_ctl_enable_tbl = rtl8411_sd_pull_ctl_enable_tbl;
 264         pcr->sd_pull_ctl_disable_tbl = rtl8411_sd_pull_ctl_disable_tbl;
 265         pcr->ms_pull_ctl_enable_tbl = rtl8411_ms_pull_ctl_enable_tbl;
 266         pcr->ms_pull_ctl_disable_tbl = rtl8411_ms_pull_ctl_disable_tbl;
 267 }