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         int err;
 119
 120         mask = (BPP_REG_TUNED18 << BPP_TUNED18_SHIFT_8411) | BPP_PAD_MASK;
 121         if (voltage == OUTPUT_3V3) {
 122                 err = rtsx_pci_write_register(pcr,
 123                                 SD30_DRIVE_SEL, 0x07, DRIVER_TYPE_D);
 124                 if (err < 0)
 125                         return err;
 126                 val = (BPP_ASIC_3V3 << BPP_TUNED18_SHIFT_8411) | BPP_PAD_3V3;
 127         } else if (voltage == OUTPUT_1V8) {
 128                 err = rtsx_pci_write_register(pcr,
 129                                 SD30_DRIVE_SEL, 0x07, DRIVER_TYPE_B);
 130                 if (err < 0)
 131                         return err;
 132                 val = (BPP_ASIC_1V8 << BPP_TUNED18_SHIFT_8411) | BPP_PAD_1V8;
 133         } else {
 134                 return -EINVAL;
 135         }
 136
 137         return rtsx_pci_write_register(pcr, LDO_CTL, mask, val);
 138 }
 139
 140 static unsigned int rtl8411_cd_deglitch(struct rtsx_pcr *pcr)
 141 {
 142         unsigned int card_exist;
 143
 144         card_exist = rtsx_pci_readl(pcr, RTSX_BIPR);
 145         card_exist &= CARD_EXIST;
 146         if (!card_exist) {
 147                 /* Enable card CD */
 148                 rtsx_pci_write_register(pcr, CD_PAD_CTL,
 149                                 CD_DISABLE_MASK, CD_ENABLE);
 150                 /* Enable card interrupt */
 151                 rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x00);
 152                 return 0;
 153         }
 154
 155         if (hweight32(card_exist) > 1) {
 156                 rtsx_pci_write_register(pcr, CARD_PWR_CTL,
 157                                 BPP_POWER_MASK, BPP_POWER_5_PERCENT_ON);
 158                 msleep(100);
 159
 160                 card_exist = rtsx_pci_readl(pcr, RTSX_BIPR);
 161                 if (card_exist & MS_EXIST)
 162                         card_exist = MS_EXIST;
 163                 else if (card_exist & SD_EXIST)
 164                         card_exist = SD_EXIST;
 165                 else
 166                         card_exist = 0;
 167
 168                 rtsx_pci_write_register(pcr, CARD_PWR_CTL,
 169                                 BPP_POWER_MASK, BPP_POWER_OFF);
 170
 171                 dev_dbg(&(pcr->pci->dev),
 172                                 "After CD deglitch, card_exist = 0x%x\n",
 173                                 card_exist);
 174         }
 175
 176         if (card_exist & MS_EXIST) {
 177                 /* Disable SD interrupt */
 178                 rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x40);
 179                 rtsx_pci_write_register(pcr, CD_PAD_CTL,
 180                                 CD_DISABLE_MASK, MS_CD_EN_ONLY);
 181         } else if (card_exist & SD_EXIST) {
 182                 /* Disable MS interrupt */
 183                 rtsx_pci_write_register(pcr, EFUSE_CONTENT, 0xe0, 0x80);
 184                 rtsx_pci_write_register(pcr, CD_PAD_CTL,
 185                                 CD_DISABLE_MASK, SD_CD_EN_ONLY);
 186         }
 187
 188         return card_exist;
 189 }
 190
 191 static int rtl8411_conv_clk_and_div_n(int input, int dir)
 192 {
 193         int output;
 194
 195         if (dir == CLK_TO_DIV_N)
 196                 output = input * 4 / 5 - 2;
 197         else
 198                 output = (input + 2) * 5 / 4;
 199
 200         return output;
 201 }
 202
 203 static const struct pcr_ops rtl8411_pcr_ops = {
 204         .extra_init_hw = rtl8411_extra_init_hw,
 205         .optimize_phy = NULL,
 206         .turn_on_led = rtl8411_turn_on_led,
 207         .turn_off_led = rtl8411_turn_off_led,
 208         .enable_auto_blink = rtl8411_enable_auto_blink,
 209         .disable_auto_blink = rtl8411_disable_auto_blink,
 210         .card_power_on = rtl8411_card_power_on,
 211         .card_power_off = rtl8411_card_power_off,
 212         .switch_output_voltage = rtl8411_switch_output_voltage,
 213         .cd_deglitch = rtl8411_cd_deglitch,
 214         .conv_clk_and_div_n = rtl8411_conv_clk_and_div_n,
 215 };
 216
 217 /* SD Pull Control Enable:
 218  *     SD_DAT[3:0] ==> pull up
 219  *     SD_CD       ==> pull up
 220  *     SD_WP       ==> pull up
 221  *     SD_CMD      ==> pull up
 222  *     SD_CLK      ==> pull down
 223  */
 224 static const u32 rtl8411_sd_pull_ctl_enable_tbl[] = {
 225         RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
 226         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 227         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xA9),
 228         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
 229         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x09),
 230         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 231         0,
 232 };
 233
 234 /* SD Pull Control Disable:
 235  *     SD_DAT[3:0] ==> pull down
 236  *     SD_CD       ==> pull up
 237  *     SD_WP       ==> pull down
 238  *     SD_CMD      ==> pull down
 239  *     SD_CLK      ==> pull down
 240  */
 241 static const u32 rtl8411_sd_pull_ctl_disable_tbl[] = {
 242         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
 243         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 244         RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
 245         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
 246         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
 247         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 248         0,
 249 };
 250
 251 /* MS Pull Control Enable:
 252  *     MS CD       ==> pull up
 253  *     others      ==> pull down
 254  */
 255 static const u32 rtl8411_ms_pull_ctl_enable_tbl[] = {
 256         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
 257         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 258         RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
 259         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x05),
 260         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
 261         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 262         0,
 263 };
 264
 265 /* MS Pull Control Disable:
 266  *     MS CD       ==> pull up
 267  *     others      ==> pull down
 268  */
 269 static const u32 rtl8411_ms_pull_ctl_disable_tbl[] = {
 270         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x65),
 271         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 272         RTSX_REG_PAIR(CARD_PULL_CTL3, 0x95),
 273         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x09),
 274         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x05),
 275         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x04),
 276         0,
 277 };
 278
 279 void rtl8411_init_params(struct rtsx_pcr *pcr)
 280 {
 281         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 282         pcr->num_slots = 2;
 283         pcr->ops = &rtl8411_pcr_ops;
 284
 285         pcr->ic_version = rtl8411_get_ic_version(pcr);
 286         pcr->sd_pull_ctl_enable_tbl = rtl8411_sd_pull_ctl_enable_tbl;
 287         pcr->sd_pull_ctl_disable_tbl = rtl8411_sd_pull_ctl_disable_tbl;
 288         pcr->ms_pull_ctl_enable_tbl = rtl8411_ms_pull_ctl_enable_tbl;
 289         pcr->ms_pull_ctl_disable_tbl = rtl8411_ms_pull_ctl_disable_tbl;
 290 }