linux/drivers/mfd/rts5249.c
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   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 *   Wei WANG <wei_wang@realsil.com.cn>
  20 *   No. 128, West Shenhu Road, Suzhou Industry Park, Suzhou, China
  21 */
  22
  23#include <linux/module.h>
  24#include <linux/delay.h>
  25#include <linux/mfd/rtsx_pci.h>
  26
  27#include "rtsx_pcr.h"
  28
  29static u8 rts5249_get_ic_version(struct rtsx_pcr *pcr)
  30{
  31        u8 val;
  32
  33        rtsx_pci_read_register(pcr, DUMMY_REG_RESET_0, &val);
  34        return val & 0x0F;
  35}
  36
  37static int rts5249_extra_init_hw(struct rtsx_pcr *pcr)
  38{
  39        rtsx_pci_init_cmd(pcr);
  40
  41        /* Configure GPIO as output */
  42        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, GPIO_CTL, 0x02, 0x02);
  43        /* Switch LDO3318 source from DV33 to card_3v3 */
  44        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x00);
  45        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x01);
  46        /* LED shine disabled, set initial shine cycle period */
  47        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, OLT_LED_CTL, 0x0F, 0x02);
  48        /* Correct driving */
  49        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
  50                        SD30_CLK_DRIVE_SEL, 0xFF, 0x99);
  51        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
  52                        SD30_CMD_DRIVE_SEL, 0xFF, 0x99);
  53        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
  54                        SD30_DAT_DRIVE_SEL, 0xFF, 0x92);
  55
  56        return rtsx_pci_send_cmd(pcr, 100);
  57}
  58
  59static int rts5249_optimize_phy(struct rtsx_pcr *pcr)
  60{
  61        int err;
  62
  63        err = rtsx_pci_write_phy_register(pcr, PHY_REG_REV, 0xFE46);
  64        if (err < 0)
  65                return err;
  66
  67        msleep(1);
  68
  69        return rtsx_pci_write_phy_register(pcr, PHY_BPCR, 0x05C0);
  70}
  71
  72static int rts5249_turn_on_led(struct rtsx_pcr *pcr)
  73{
  74        return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x02);
  75}
  76
  77static int rts5249_turn_off_led(struct rtsx_pcr *pcr)
  78{
  79        return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x00);
  80}
  81
  82static int rts5249_enable_auto_blink(struct rtsx_pcr *pcr)
  83{
  84        return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x08);
  85}
  86
  87static int rts5249_disable_auto_blink(struct rtsx_pcr *pcr)
  88{
  89        return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x00);
  90}
  91
  92static int rts5249_card_power_on(struct rtsx_pcr *pcr, int card)
  93{
  94        int err;
  95
  96        rtsx_pci_init_cmd(pcr);
  97        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
  98                        SD_POWER_MASK, SD_VCC_PARTIAL_POWER_ON);
  99        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 100                        LDO3318_PWR_MASK, 0x02);
 101        err = rtsx_pci_send_cmd(pcr, 100);
 102        if (err < 0)
 103                return err;
 104
 105        msleep(5);
 106
 107        rtsx_pci_init_cmd(pcr);
 108        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 109                        SD_POWER_MASK, SD_VCC_POWER_ON);
 110        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 111                        LDO3318_PWR_MASK, 0x06);
 112        err = rtsx_pci_send_cmd(pcr, 100);
 113        if (err < 0)
 114                return err;
 115
 116        return 0;
 117}
 118
 119static int rts5249_card_power_off(struct rtsx_pcr *pcr, int card)
 120{
 121        rtsx_pci_init_cmd(pcr);
 122        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 123                        SD_POWER_MASK, SD_POWER_OFF);
 124        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 125                        LDO3318_PWR_MASK, 0x00);
 126        return rtsx_pci_send_cmd(pcr, 100);
 127}
 128
 129static int rts5249_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 130{
 131        int err;
 132        u8 clk_drive, cmd_drive, dat_drive;
 133
 134        if (voltage == OUTPUT_3V3) {
 135                err = rtsx_pci_write_phy_register(pcr, PHY_TUNE, 0x4FC0 | 0x24);
 136                if (err < 0)
 137                        return err;
 138                clk_drive = 0x99;
 139                cmd_drive = 0x99;
 140                dat_drive = 0x92;
 141        } else if (voltage == OUTPUT_1V8) {
 142                err = rtsx_pci_write_phy_register(pcr, PHY_BACR, 0x3C02);
 143                if (err < 0)
 144                        return err;
 145                err = rtsx_pci_write_phy_register(pcr, PHY_TUNE, 0x4C40 | 0x24);
 146                if (err < 0)
 147                        return err;
 148                clk_drive = 0xb3;
 149                cmd_drive = 0xb3;
 150                dat_drive = 0xb3;
 151        } else {
 152                return -EINVAL;
 153        }
 154
 155        /* set pad drive */
 156        rtsx_pci_init_cmd(pcr);
 157        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_CLK_DRIVE_SEL,
 158                        0xFF, clk_drive);
 159        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_CMD_DRIVE_SEL,
 160                        0xFF, cmd_drive);
 161        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_DAT_DRIVE_SEL,
 162                        0xFF, dat_drive);
 163        return rtsx_pci_send_cmd(pcr, 100);
 164}
 165
 166static const struct pcr_ops rts5249_pcr_ops = {
 167        .extra_init_hw = rts5249_extra_init_hw,
 168        .optimize_phy = rts5249_optimize_phy,
 169        .turn_on_led = rts5249_turn_on_led,
 170        .turn_off_led = rts5249_turn_off_led,
 171        .enable_auto_blink = rts5249_enable_auto_blink,
 172        .disable_auto_blink = rts5249_disable_auto_blink,
 173        .card_power_on = rts5249_card_power_on,
 174        .card_power_off = rts5249_card_power_off,
 175        .switch_output_voltage = rts5249_switch_output_voltage,
 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 */
 185static const u32 rts5249_sd_pull_ctl_enable_tbl[] = {
 186        RTSX_REG_PAIR(CARD_PULL_CTL1, 0x66),
 187        RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 188        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 189        RTSX_REG_PAIR(CARD_PULL_CTL4, 0xAA),
 190        0,
 191};
 192
 193/* SD Pull Control Disable:
 194 *     SD_DAT[3:0] ==> pull down
 195 *     SD_CD       ==> pull up
 196 *     SD_WP       ==> pull down
 197 *     SD_CMD      ==> pull down
 198 *     SD_CLK      ==> pull down
 199 */
 200static const u32 rts5249_sd_pull_ctl_disable_tbl[] = {
 201        RTSX_REG_PAIR(CARD_PULL_CTL1, 0x66),
 202        RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 203        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 204        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 205        0,
 206};
 207
 208/* MS Pull Control Enable:
 209 *     MS CD       ==> pull up
 210 *     others      ==> pull down
 211 */
 212static const u32 rts5249_ms_pull_ctl_enable_tbl[] = {
 213        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 214        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 215        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 216        0,
 217};
 218
 219/* MS Pull Control Disable:
 220 *     MS CD       ==> pull up
 221 *     others      ==> pull down
 222 */
 223static const u32 rts5249_ms_pull_ctl_disable_tbl[] = {
 224        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 225        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 226        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 227        0,
 228};
 229
 230void rts5249_init_params(struct rtsx_pcr *pcr)
 231{
 232        pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 233        pcr->num_slots = 2;
 234        pcr->ops = &rts5249_pcr_ops;
 235
 236        pcr->ic_version = rts5249_get_ic_version(pcr);
 237        pcr->sd_pull_ctl_enable_tbl = rts5249_sd_pull_ctl_enable_tbl;
 238        pcr->sd_pull_ctl_disable_tbl = rts5249_sd_pull_ctl_disable_tbl;
 239        pcr->ms_pull_ctl_enable_tbl = rts5249_ms_pull_ctl_enable_tbl;
 240        pcr->ms_pull_ctl_disable_tbl = rts5249_ms_pull_ctl_disable_tbl;
 241}
 242
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