drivers/mfd/rts5229.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/delay.h>
  25 #include <linux/mfd/rtsx_pci.h>
  26
  27 #include "rtsx_pcr.h"
  28
  29 static 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
  37 static 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
  52 static 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
  58 static int rts5229_turn_on_led(struct rtsx_pcr *pcr)
  59 {
  60         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x02);
  61 }
  62
  63 static int rts5229_turn_off_led(struct rtsx_pcr *pcr)
  64 {
  65         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x00);
  66 }
  67
  68 static int rts5229_enable_auto_blink(struct rtsx_pcr *pcr)
  69 {
  70         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x08);
  71 }
  72
  73 static int rts5229_disable_auto_blink(struct rtsx_pcr *pcr)
  74 {
  75         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x00);
  76 }
  77
  78 static 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
 106 static 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
 117 static 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_register(pcr,
 123                                 SD30_DRIVE_SEL, 0x07, DRIVER_TYPE_D);
 124                 if (err < 0)
 125                         return err;
 126                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 127                 if (err < 0)
 128                         return err;
 129         } else if (voltage == OUTPUT_1V8) {
 130                 err = rtsx_pci_write_register(pcr,
 131                                 SD30_DRIVE_SEL, 0x07, DRIVER_TYPE_B);
 132                 if (err < 0)
 133                         return err;
 134                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
 135                 if (err < 0)
 136                         return err;
 137         } else {
 138                 return -EINVAL;
 139         }
 140
 141         return 0;
 142 }
 143
 144 static const struct pcr_ops rts5229_pcr_ops = {
 145         .extra_init_hw = rts5229_extra_init_hw,
 146         .optimize_phy = rts5229_optimize_phy,
 147         .turn_on_led = rts5229_turn_on_led,
 148         .turn_off_led = rts5229_turn_off_led,
 149         .enable_auto_blink = rts5229_enable_auto_blink,
 150         .disable_auto_blink = rts5229_disable_auto_blink,
 151         .card_power_on = rts5229_card_power_on,
 152         .card_power_off = rts5229_card_power_off,
 153         .switch_output_voltage = rts5229_switch_output_voltage,
 154         .cd_deglitch = NULL,
 155         .conv_clk_and_div_n = NULL,
 156 };
 157
 158 /* SD Pull Control Enable:
 159  *     SD_DAT[3:0] ==> pull up
 160  *     SD_CD       ==> pull up
 161  *     SD_WP       ==> pull up
 162  *     SD_CMD      ==> pull up
 163  *     SD_CLK      ==> pull down
 164  */
 165 static const u32 rts5229_sd_pull_ctl_enable_tbl1[] = {
 166         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 167         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 168         0,
 169 };
 170
 171 /* For RTS5229 version C */
 172 static const u32 rts5229_sd_pull_ctl_enable_tbl2[] = {
 173         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 174         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD9),
 175         0,
 176 };
 177
 178 /* SD Pull Control Disable:
 179  *     SD_DAT[3:0] ==> pull down
 180  *     SD_CD       ==> pull up
 181  *     SD_WP       ==> pull down
 182  *     SD_CMD      ==> pull down
 183  *     SD_CLK      ==> pull down
 184  */
 185 static const u32 rts5229_sd_pull_ctl_disable_tbl1[] = {
 186         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 187         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 188         0,
 189 };
 190
 191 /* For RTS5229 version C */
 192 static const u32 rts5229_sd_pull_ctl_disable_tbl2[] = {
 193         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 194         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE5),
 195         0,
 196 };
 197
 198 /* MS Pull Control Enable:
 199  *     MS CD       ==> pull up
 200  *     others      ==> pull down
 201  */
 202 static const u32 rts5229_ms_pull_ctl_enable_tbl[] = {
 203         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 204         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 205         0,
 206 };
 207
 208 /* MS Pull Control Disable:
 209  *     MS CD       ==> pull up
 210  *     others      ==> pull down
 211  */
 212 static const u32 rts5229_ms_pull_ctl_disable_tbl[] = {
 213         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 214         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 215         0,
 216 };
 217
 218 void rts5229_init_params(struct rtsx_pcr *pcr)
 219 {
 220         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 221         pcr->num_slots = 2;
 222         pcr->ops = &rts5229_pcr_ops;
 223
 224         pcr->ic_version = rts5229_get_ic_version(pcr);
 225         if (pcr->ic_version == IC_VER_C) {
 226                 pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl2;
 227                 pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl2;
 228         } else {
 229                 pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl1;
 230                 pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl1;
 231         }
 232         pcr->ms_pull_ctl_enable_tbl = rts5229_ms_pull_ctl_enable_tbl;
 233         pcr->ms_pull_ctl_disable_tbl = rts5229_ms_pull_ctl_disable_tbl;
 234 }