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 void rts5229_force_power_down(struct rtsx_pcr *pcr)
  60 {
  61         rtsx_pci_write_register(pcr, FPDCTL, 0x03, 0x03);
  62 }
  63
  64 static int rts5229_extra_init_hw(struct rtsx_pcr *pcr)
  65 {
  66         rtsx_pci_init_cmd(pcr);
  67
  68         /* Configure GPIO as output */
  69         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, GPIO_CTL, 0x02, 0x02);
  70         /* Reset ASPM state to default value */
  71         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, ASPM_FORCE_CTL, 0x3F, 0);
  72         /* Force CLKREQ# PIN to drive 0 to request clock */
  73         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG, 0x08, 0x08);
  74         /* Switch LDO3318 source from DV33 to card_3v3 */
  75         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x00);
  76         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x01);
  77         /* LED shine disabled, set initial shine cycle period */
  78         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, OLT_LED_CTL, 0x0F, 0x02);
  79         /* Configure driving */
  80         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_DRIVE_SEL,
  81                         0xFF, pcr->sd30_drive_sel_3v3);
  82
  83         return rtsx_pci_send_cmd(pcr, 100);
  84 }
  85
  86 static int rts5229_optimize_phy(struct rtsx_pcr *pcr)
  87 {
  88         /* Optimize RX sensitivity */
  89         return rtsx_pci_write_phy_register(pcr, 0x00, 0xBA42);
  90 }
  91
  92 static int rts5229_turn_on_led(struct rtsx_pcr *pcr)
  93 {
  94         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x02);
  95 }
  96
  97 static int rts5229_turn_off_led(struct rtsx_pcr *pcr)
  98 {
  99         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x00);
 100 }
 101
 102 static int rts5229_enable_auto_blink(struct rtsx_pcr *pcr)
 103 {
 104         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x08);
 105 }
 106
 107 static int rts5229_disable_auto_blink(struct rtsx_pcr *pcr)
 108 {
 109         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x00);
 110 }
 111
 112 static int rts5229_card_power_on(struct rtsx_pcr *pcr, int card)
 113 {
 114         int err;
 115
 116         rtsx_pci_init_cmd(pcr);
 117         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 118                         SD_POWER_MASK, SD_PARTIAL_POWER_ON);
 119         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 120                         LDO3318_PWR_MASK, 0x02);
 121         err = rtsx_pci_send_cmd(pcr, 100);
 122         if (err < 0)
 123                 return err;
 124
 125         /* To avoid too large in-rush current */
 126         udelay(150);
 127
 128         rtsx_pci_init_cmd(pcr);
 129         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 130                         SD_POWER_MASK, SD_POWER_ON);
 131         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 132                         LDO3318_PWR_MASK, 0x06);
 133         err = rtsx_pci_send_cmd(pcr, 100);
 134         if (err < 0)
 135                 return err;
 136
 137         return 0;
 138 }
 139
 140 static int rts5229_card_power_off(struct rtsx_pcr *pcr, int card)
 141 {
 142         rtsx_pci_init_cmd(pcr);
 143         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 144                         SD_POWER_MASK | PMOS_STRG_MASK,
 145                         SD_POWER_OFF | PMOS_STRG_400mA);
 146         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 147                         LDO3318_PWR_MASK, 0x00);
 148         return rtsx_pci_send_cmd(pcr, 100);
 149 }
 150
 151 static int rts5229_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 152 {
 153         int err;
 154
 155         if (voltage == OUTPUT_3V3) {
 156                 err = rtsx_pci_write_register(pcr,
 157                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_3v3);
 158                 if (err < 0)
 159                         return err;
 160                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 161                 if (err < 0)
 162                         return err;
 163         } else if (voltage == OUTPUT_1V8) {
 164                 err = rtsx_pci_write_register(pcr,
 165                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_1v8);
 166                 if (err < 0)
 167                         return err;
 168                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
 169                 if (err < 0)
 170                         return err;
 171         } else {
 172                 return -EINVAL;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static const struct pcr_ops rts5229_pcr_ops = {
 179         .fetch_vendor_settings = rts5229_fetch_vendor_settings,
 180         .extra_init_hw = rts5229_extra_init_hw,
 181         .optimize_phy = rts5229_optimize_phy,
 182         .turn_on_led = rts5229_turn_on_led,
 183         .turn_off_led = rts5229_turn_off_led,
 184         .enable_auto_blink = rts5229_enable_auto_blink,
 185         .disable_auto_blink = rts5229_disable_auto_blink,
 186         .card_power_on = rts5229_card_power_on,
 187         .card_power_off = rts5229_card_power_off,
 188         .switch_output_voltage = rts5229_switch_output_voltage,
 189         .cd_deglitch = NULL,
 190         .conv_clk_and_div_n = NULL,
 191         .force_power_down = rts5229_force_power_down,
 192 };
 193
 194 /* SD Pull Control Enable:
 195  *     SD_DAT[3:0] ==> pull up
 196  *     SD_CD       ==> pull up
 197  *     SD_WP       ==> pull up
 198  *     SD_CMD      ==> pull up
 199  *     SD_CLK      ==> pull down
 200  */
 201 static const u32 rts5229_sd_pull_ctl_enable_tbl1[] = {
 202         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 203         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 204         0,
 205 };
 206
 207 /* For RTS5229 version C */
 208 static const u32 rts5229_sd_pull_ctl_enable_tbl2[] = {
 209         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 210         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD9),
 211         0,
 212 };
 213
 214 /* SD Pull Control Disable:
 215  *     SD_DAT[3:0] ==> pull down
 216  *     SD_CD       ==> pull up
 217  *     SD_WP       ==> pull down
 218  *     SD_CMD      ==> pull down
 219  *     SD_CLK      ==> pull down
 220  */
 221 static const u32 rts5229_sd_pull_ctl_disable_tbl1[] = {
 222         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 223         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 224         0,
 225 };
 226
 227 /* For RTS5229 version C */
 228 static const u32 rts5229_sd_pull_ctl_disable_tbl2[] = {
 229         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 230         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE5),
 231         0,
 232 };
 233
 234 /* MS Pull Control Enable:
 235  *     MS CD       ==> pull up
 236  *     others      ==> pull down
 237  */
 238 static const u32 rts5229_ms_pull_ctl_enable_tbl[] = {
 239         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 240         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 241         0,
 242 };
 243
 244 /* MS Pull Control Disable:
 245  *     MS CD       ==> pull up
 246  *     others      ==> pull down
 247  */
 248 static const u32 rts5229_ms_pull_ctl_disable_tbl[] = {
 249         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 250         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 251         0,
 252 };
 253
 254 void rts5229_init_params(struct rtsx_pcr *pcr)
 255 {
 256         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 257         pcr->num_slots = 2;
 258         pcr->ops = &rts5229_pcr_ops;
 259
 260         pcr->flags = 0;
 261         pcr->card_drive_sel = RTSX_CARD_DRIVE_DEFAULT;
 262         pcr->sd30_drive_sel_1v8 = DRIVER_TYPE_B;
 263         pcr->sd30_drive_sel_3v3 = DRIVER_TYPE_D;
 264         pcr->aspm_en = ASPM_L1_EN;
 265
 266         pcr->ic_version = rts5229_get_ic_version(pcr);
 267         if (pcr->ic_version == IC_VER_C) {
 268                 pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl2;
 269                 pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl2;
 270         } else {
 271                 pcr->sd_pull_ctl_enable_tbl = rts5229_sd_pull_ctl_enable_tbl1;
 272                 pcr->sd_pull_ctl_disable_tbl = rts5229_sd_pull_ctl_disable_tbl1;
 273         }
 274         pcr->ms_pull_ctl_enable_tbl = rts5229_ms_pull_ctl_enable_tbl;
 275         pcr->ms_pull_ctl_disable_tbl = rts5229_ms_pull_ctl_disable_tbl;
 276 }