linux/drivers/mfd/rtl8411.c
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   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
  30static 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
  38static 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
  44static int rtl8411_turn_on_led(struct rtsx_pcr *pcr)
  45{
  46        return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
  47}
  48
  49static int rtl8411_turn_off_led(struct rtsx_pcr *pcr)
  50{
  51        return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
  52}
  53
  54static int rtl8411_enable_auto_blink(struct rtsx_pcr *pcr)
  55{
  56        return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
  57}
  58
  59static int rtl8411_disable_auto_blink(struct rtsx_pcr *pcr)
  60{
  61        return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
  62}
  63
  64static 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
 102static 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
 115static 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
 140static 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
 191static 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
 203static 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 */
 224static 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 */
 241static 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 */
 255static 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 */
 269static 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
 279void 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}
 291
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