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 const struct pcr_ops rts5229_pcr_ops = {
 118         .extra_init_hw = rts5229_extra_init_hw,
 119         .optimize_phy = rts5229_optimize_phy,
 120         .turn_on_led = rts5229_turn_on_led,
 121         .turn_off_led = rts5229_turn_off_led,
 122         .enable_auto_blink = rts5229_enable_auto_blink,
 123         .disable_auto_blink = rts5229_disable_auto_blink,
 124         .card_power_on = rts5229_card_power_on,
 125         .card_power_off = rts5229_card_power_off,
 126         .cd_deglitch = NULL,
 127 };
 128
 129 /* SD Pull Control Enable:
 130  *     SD_DAT[3:0] ==> pull up
 131  *     SD_CD       ==> pull up
 132  *     SD_WP       ==> pull up
 133  *     SD_CMD      ==> pull up
 134  *     SD_CLK      ==> pull down
 135  */
 136 static const u32 rts5229_sd_pull_ctl_enable_tbl1[] = {
 137         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 138         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 139         0,
 140 };
 141
 142 /* For RTS5229 version C */
 143 static const u32 rts5229_sd_pull_ctl_enable_tbl2[] = {
 144         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 145         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD9),
 146         0,
 147 };
 148
 149 /* SD Pull Control Disable:
 150  *     SD_DAT[3:0] ==> pull down
 151  *     SD_CD       ==> pull up
 152  *     SD_WP       ==> pull down
 153  *     SD_CMD      ==> pull down
 154  *     SD_CLK      ==> pull down
 155  */
 156 static const u32 rts5229_sd_pull_ctl_disable_tbl1[] = {
 157         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 158         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 159         0,
 160 };
 161
 162 /* For RTS5229 version C */
 163 static const u32 rts5229_sd_pull_ctl_disable_tbl2[] = {
 164         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 165         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE5),
 166         0,
 167 };
 168
 169 /* MS Pull Control Enable:
 170  *     MS CD       ==> pull up
 171  *     others      ==> pull down
 172  */
 173 static const u32 rts5229_ms_pull_ctl_enable_tbl[] = {
 174         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 175         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 176         0,
 177 };
 178
 179 /* MS Pull Control Disable:
 180  *     MS CD       ==> pull up
 181  *     others      ==> pull down
 182  */
 183 static const u32 rts5229_ms_pull_ctl_disable_tbl[] = {
 184         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 185         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 186         0,
 187 };
 188
 189 void rts5229_init_params(struct rtsx_pcr *pcr)
 190 {
 191         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 192         pcr->num_slots = 2;
 193         pcr->ops = &rts5229_pcr_ops;
 194
 195         pcr->ic_version = rts5229_get_ic_version(pcr);
 196         if (pcr->ic_version == IC_VER_C) {
 197                 pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl2;
 198                 pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl2;
 199         } else {
 200                 pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl1;
 201                 pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl1;
 202         }
 203         pcr->ms_pull_ctl_enable_tbl = rts5229_ms_pull_ctl_enable_tbl;
 204         pcr->ms_pull_ctl_disable_tbl = rts5229_ms_pull_ctl_disable_tbl;
 205 }