linux/drivers/mfd/rts5229.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/delay.h>
  25#include <linux/mfd/rtsx_pci.h>
  26
  27#include "rtsx_pcr.h"
  28
  29static u8 rts5229_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 rts5229_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
  49        return rtsx_pci_send_cmd(pcr, 100);
  50}
  51
  52static int rts5229_optimize_phy(struct rtsx_pcr *pcr)
  53{
  54        /* Optimize RX sensitivity */
  55        return rtsx_pci_write_phy_register(pcr, 0x00, 0xBA42);
  56}
  57
  58static int rts5229_turn_on_led(struct rtsx_pcr *pcr)
  59{
  60        return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x02);
  61}
  62
  63static int rts5229_turn_off_led(struct rtsx_pcr *pcr)
  64{
  65        return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x00);
  66}
  67
  68static int rts5229_enable_auto_blink(struct rtsx_pcr *pcr)
  69{
  70        return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x08);
  71}
  72
  73static int rts5229_disable_auto_blink(struct rtsx_pcr *pcr)
  74{
  75        return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x00);
  76}
  77
  78static int rts5229_card_power_on(struct rtsx_pcr *pcr, int card)
  79{
  80        int err;
  81
  82        rtsx_pci_init_cmd(pcr);
  83        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
  84                        SD_POWER_MASK, SD_PARTIAL_POWER_ON);
  85        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
  86                        LDO3318_PWR_MASK, 0x02);
  87        err = rtsx_pci_send_cmd(pcr, 100);
  88        if (err < 0)
  89                return err;
  90
  91        /* To avoid too large in-rush current */
  92        udelay(150);
  93
  94        rtsx_pci_init_cmd(pcr);
  95        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
  96                        SD_POWER_MASK, SD_POWER_ON);
  97        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
  98                        LDO3318_PWR_MASK, 0x06);
  99        err = rtsx_pci_send_cmd(pcr, 100);
 100        if (err < 0)
 101                return err;
 102
 103        return 0;
 104}
 105
 106static int rts5229_card_power_off(struct rtsx_pcr *pcr, int card)
 107{
 108        rtsx_pci_init_cmd(pcr);
 109        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 110                        SD_POWER_MASK | PMOS_STRG_MASK,
 111                        SD_POWER_OFF | PMOS_STRG_400mA);
 112        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 113                        LDO3318_PWR_MASK, 0X00);
 114        return rtsx_pci_send_cmd(pcr, 100);
 115}
 116
 117static int rts5229_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 118{
 119        int err;
 120
 121        if (voltage == OUTPUT_3V3) {
 122                err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 123                if (err < 0)
 124                        return err;
 125        } else if (voltage == OUTPUT_1V8) {
 126                err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
 127                if (err < 0)
 128                        return err;
 129        } else {
 130                return -EINVAL;
 131        }
 132
 133        return 0;
 134}
 135
 136static const struct pcr_ops rts5229_pcr_ops = {
 137        .extra_init_hw = rts5229_extra_init_hw,
 138        .optimize_phy = rts5229_optimize_phy,
 139        .turn_on_led = rts5229_turn_on_led,
 140        .turn_off_led = rts5229_turn_off_led,
 141        .enable_auto_blink = rts5229_enable_auto_blink,
 142        .disable_auto_blink = rts5229_disable_auto_blink,
 143        .card_power_on = rts5229_card_power_on,
 144        .card_power_off = rts5229_card_power_off,
 145        .switch_output_voltage = rts5229_switch_output_voltage,
 146        .cd_deglitch = NULL,
 147        .conv_clk_and_div_n = NULL,
 148};
 149
 150/* SD Pull Control Enable:
 151 *     SD_DAT[3:0] ==> pull up
 152 *     SD_CD       ==> pull up
 153 *     SD_WP       ==> pull up
 154 *     SD_CMD      ==> pull up
 155 *     SD_CLK      ==> pull down
 156 */
 157static const u32 rts5229_sd_pull_ctl_enable_tbl1[] = {
 158        RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 159        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 160        0,
 161};
 162
 163/* For RTS5229 version C */
 164static const u32 rts5229_sd_pull_ctl_enable_tbl2[] = {
 165        RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 166        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD9),
 167        0,
 168};
 169
 170/* SD Pull Control Disable:
 171 *     SD_DAT[3:0] ==> pull down
 172 *     SD_CD       ==> pull up
 173 *     SD_WP       ==> pull down
 174 *     SD_CMD      ==> pull down
 175 *     SD_CLK      ==> pull down
 176 */
 177static const u32 rts5229_sd_pull_ctl_disable_tbl1[] = {
 178        RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 179        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 180        0,
 181};
 182
 183/* For RTS5229 version C */
 184static const u32 rts5229_sd_pull_ctl_disable_tbl2[] = {
 185        RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 186        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE5),
 187        0,
 188};
 189
 190/* MS Pull Control Enable:
 191 *     MS CD       ==> pull up
 192 *     others      ==> pull down
 193 */
 194static const u32 rts5229_ms_pull_ctl_enable_tbl[] = {
 195        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 196        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 197        0,
 198};
 199
 200/* MS Pull Control Disable:
 201 *     MS CD       ==> pull up
 202 *     others      ==> pull down
 203 */
 204static const u32 rts5229_ms_pull_ctl_disable_tbl[] = {
 205        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 206        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 207        0,
 208};
 209
 210void rts5229_init_params(struct rtsx_pcr *pcr)
 211{
 212        pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 213        pcr->num_slots = 2;
 214        pcr->ops = &rts5229_pcr_ops;
 215
 216        pcr->ic_version = rts5229_get_ic_version(pcr);
 217        if (pcr->ic_version == IC_VER_C) {
 218                pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl2;
 219                pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl2;
 220        } else {
 221                pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl1;
 222                pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl1;
 223        }
 224        pcr->ms_pull_ctl_enable_tbl = rts5229_ms_pull_ctl_enable_tbl;
 225        pcr->ms_pull_ctl_disable_tbl = rts5229_ms_pull_ctl_disable_tbl;
 226}
 227
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