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 void rts5229_fetch_vendor_settings(struct rtsx_pcr *pcr)
  38 {
  39         u32 reg;
  40
  41         rtsx_pci_read_config_dword(pcr, PCR_SETTING_REG1, &reg);
  42         dev_dbg(&(pcr->pci->dev), "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG1, reg);
  43
  44         if (!rtsx_vendor_setting_valid(reg))
  45                 return;
  46
  47         pcr->aspm_en = rtsx_reg_to_aspm(reg);
  48         pcr->sd30_drive_sel_1v8 =
  49                 map_sd_drive(rtsx_reg_to_sd30_drive_sel_1v8(reg));
  50         pcr->card_drive_sel &= 0x3F;
  51         pcr->card_drive_sel |= rtsx_reg_to_card_drive_sel(reg);
  52
  53         rtsx_pci_read_config_dword(pcr, PCR_SETTING_REG2, &reg);
  54         dev_dbg(&(pcr->pci->dev), "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG2, reg);
  55         pcr->sd30_drive_sel_3v3 =
  56                 map_sd_drive(rtsx_reg_to_sd30_drive_sel_3v3(reg));
  57 }
  58
  59 static int rts5229_extra_init_hw(struct rtsx_pcr *pcr)
  60 {
  61         rtsx_pci_init_cmd(pcr);
  62
  63         /* Configure GPIO as output */
  64         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, GPIO_CTL, 0x02, 0x02);
  65         /* Switch LDO3318 source from DV33 to card_3v3 */
  66         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x00);
  67         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x01);
  68         /* LED shine disabled, set initial shine cycle period */
  69         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, OLT_LED_CTL, 0x0F, 0x02);
  70         /* Configure driving */
  71         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_DRIVE_SEL,
  72                         0xFF, pcr->sd30_drive_sel_3v3);
  73
  74         return rtsx_pci_send_cmd(pcr, 100);
  75 }
  76
  77 static int rts5229_optimize_phy(struct rtsx_pcr *pcr)
  78 {
  79         /* Optimize RX sensitivity */
  80         return rtsx_pci_write_phy_register(pcr, 0x00, 0xBA42);
  81 }
  82
  83 static int rts5229_turn_on_led(struct rtsx_pcr *pcr)
  84 {
  85         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x02);
  86 }
  87
  88 static int rts5229_turn_off_led(struct rtsx_pcr *pcr)
  89 {
  90         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x00);
  91 }
  92
  93 static int rts5229_enable_auto_blink(struct rtsx_pcr *pcr)
  94 {
  95         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x08);
  96 }
  97
  98 static int rts5229_disable_auto_blink(struct rtsx_pcr *pcr)
  99 {
 100         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x00);
 101 }
 102
 103 static int rts5229_card_power_on(struct rtsx_pcr *pcr, int card)
 104 {
 105         int err;
 106
 107         rtsx_pci_init_cmd(pcr);
 108         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 109                         SD_POWER_MASK, SD_PARTIAL_POWER_ON);
 110         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 111                         LDO3318_PWR_MASK, 0x02);
 112         err = rtsx_pci_send_cmd(pcr, 100);
 113         if (err < 0)
 114                 return err;
 115
 116         /* To avoid too large in-rush current */
 117         udelay(150);
 118
 119         rtsx_pci_init_cmd(pcr);
 120         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 121                         SD_POWER_MASK, SD_POWER_ON);
 122         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 123                         LDO3318_PWR_MASK, 0x06);
 124         err = rtsx_pci_send_cmd(pcr, 100);
 125         if (err < 0)
 126                 return err;
 127
 128         return 0;
 129 }
 130
 131 static int rts5229_card_power_off(struct rtsx_pcr *pcr, int card)
 132 {
 133         rtsx_pci_init_cmd(pcr);
 134         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 135                         SD_POWER_MASK | PMOS_STRG_MASK,
 136                         SD_POWER_OFF | PMOS_STRG_400mA);
 137         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 138                         LDO3318_PWR_MASK, 0x00);
 139         return rtsx_pci_send_cmd(pcr, 100);
 140 }
 141
 142 static int rts5229_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 143 {
 144         int err;
 145
 146         if (voltage == OUTPUT_3V3) {
 147                 err = rtsx_pci_write_register(pcr,
 148                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_3v3);
 149                 if (err < 0)
 150                         return err;
 151                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 152                 if (err < 0)
 153                         return err;
 154         } else if (voltage == OUTPUT_1V8) {
 155                 err = rtsx_pci_write_register(pcr,
 156                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_1v8);
 157                 if (err < 0)
 158                         return err;
 159                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
 160                 if (err < 0)
 161                         return err;
 162         } else {
 163                 return -EINVAL;
 164         }
 165
 166         return 0;
 167 }
 168
 169 static const struct pcr_ops rts5229_pcr_ops = {
 170         .fetch_vendor_settings = rts5229_fetch_vendor_settings,
 171         .extra_init_hw = rts5229_extra_init_hw,
 172         .optimize_phy = rts5229_optimize_phy,
 173         .turn_on_led = rts5229_turn_on_led,
 174         .turn_off_led = rts5229_turn_off_led,
 175         .enable_auto_blink = rts5229_enable_auto_blink,
 176         .disable_auto_blink = rts5229_disable_auto_blink,
 177         .card_power_on = rts5229_card_power_on,
 178         .card_power_off = rts5229_card_power_off,
 179         .switch_output_voltage = rts5229_switch_output_voltage,
 180         .cd_deglitch = NULL,
 181         .conv_clk_and_div_n = NULL,
 182 };
 183
 184 /* SD Pull Control Enable:
 185  *     SD_DAT[3:0] ==> pull up
 186  *     SD_CD       ==> pull up
 187  *     SD_WP       ==> pull up
 188  *     SD_CMD      ==> pull up
 189  *     SD_CLK      ==> pull down
 190  */
 191 static const u32 rts5229_sd_pull_ctl_enable_tbl1[] = {
 192         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 193         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 194         0,
 195 };
 196
 197 /* For RTS5229 version C */
 198 static const u32 rts5229_sd_pull_ctl_enable_tbl2[] = {
 199         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 200         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD9),
 201         0,
 202 };
 203
 204 /* SD Pull Control Disable:
 205  *     SD_DAT[3:0] ==> pull down
 206  *     SD_CD       ==> pull up
 207  *     SD_WP       ==> pull down
 208  *     SD_CMD      ==> pull down
 209  *     SD_CLK      ==> pull down
 210  */
 211 static const u32 rts5229_sd_pull_ctl_disable_tbl1[] = {
 212         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 213         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 214         0,
 215 };
 216
 217 /* For RTS5229 version C */
 218 static const u32 rts5229_sd_pull_ctl_disable_tbl2[] = {
 219         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 220         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE5),
 221         0,
 222 };
 223
 224 /* MS Pull Control Enable:
 225  *     MS CD       ==> pull up
 226  *     others      ==> pull down
 227  */
 228 static const u32 rts5229_ms_pull_ctl_enable_tbl[] = {
 229         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 230         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 231         0,
 232 };
 233
 234 /* MS Pull Control Disable:
 235  *     MS CD       ==> pull up
 236  *     others      ==> pull down
 237  */
 238 static const u32 rts5229_ms_pull_ctl_disable_tbl[] = {
 239         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 240         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 241         0,
 242 };
 243
 244 void rts5229_init_params(struct rtsx_pcr *pcr)
 245 {
 246         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 247         pcr->num_slots = 2;
 248         pcr->ops = &rts5229_pcr_ops;
 249
 250         pcr->flags = 0;
 251         pcr->card_drive_sel = RTSX_CARD_DRIVE_DEFAULT;
 252         pcr->sd30_drive_sel_1v8 = DRIVER_TYPE_B;
 253         pcr->sd30_drive_sel_3v3 = DRIVER_TYPE_D;
 254         pcr->aspm_en = ASPM_L1_EN;
 255
 256         pcr->ic_version = rts5229_get_ic_version(pcr);
 257         if (pcr->ic_version == IC_VER_C) {
 258                 pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl2;
 259                 pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl2;
 260         } else {
 261                 pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl1;
 262                 pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl1;
 263         }
 264         pcr->ms_pull_ctl_enable_tbl = rts5229_ms_pull_ctl_enable_tbl;
 265         pcr->ms_pull_ctl_disable_tbl = rts5229_ms_pull_ctl_disable_tbl;
 266 }