drivers/mfd/rts5209.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 rts5209_get_ic_version(struct rtsx_pcr *pcr)
  30 {
  31         u8 val;
  32
  33         val = rtsx_pci_readb(pcr, 0x1C);
  34         return val & 0x0F;
  35 }
  36
  37 static void rts5209_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 (rts5209_vendor_setting1_valid(reg)) {
  45                 if (rts5209_reg_check_ms_pmos(reg))
  46                         pcr->flags |= PCR_MS_PMOS;
  47                 pcr->aspm_en = rts5209_reg_to_aspm(reg);
  48         }
  49
  50         rtsx_pci_read_config_dword(pcr, PCR_SETTING_REG2, &reg);
  51         dev_dbg(&(pcr->pci->dev), "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG2, reg);
  52
  53         if (rts5209_vendor_setting2_valid(reg)) {
  54                 pcr->sd30_drive_sel_1v8 =
  55                         rts5209_reg_to_sd30_drive_sel_1v8(reg);
  56                 pcr->sd30_drive_sel_3v3 =
  57                         rts5209_reg_to_sd30_drive_sel_3v3(reg);
  58                 pcr->card_drive_sel = rts5209_reg_to_card_drive_sel(reg);
  59         }
  60 }
  61
  62 static int rts5209_extra_init_hw(struct rtsx_pcr *pcr)
  63 {
  64         rtsx_pci_init_cmd(pcr);
  65
  66         /* Turn off LED */
  67         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO, 0xFF, 0x03);
  68         /* Configure GPIO as output */
  69         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO_DIR, 0xFF, 0x03);
  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 rts5209_optimize_phy(struct rtsx_pcr *pcr)
  78 {
  79         return rtsx_pci_write_phy_register(pcr, 0x00, 0xB966);
  80 }
  81
  82 static int rts5209_turn_on_led(struct rtsx_pcr *pcr)
  83 {
  84         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
  85 }
  86
  87 static int rts5209_turn_off_led(struct rtsx_pcr *pcr)
  88 {
  89         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
  90 }
  91
  92 static int rts5209_enable_auto_blink(struct rtsx_pcr *pcr)
  93 {
  94         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
  95 }
  96
  97 static int rts5209_disable_auto_blink(struct rtsx_pcr *pcr)
  98 {
  99         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
 100 }
 101
 102 static int rts5209_card_power_on(struct rtsx_pcr *pcr, int card)
 103 {
 104         int err;
 105         u8 pwr_mask, partial_pwr_on, pwr_on;
 106
 107         pwr_mask = SD_POWER_MASK;
 108         partial_pwr_on = SD_PARTIAL_POWER_ON;
 109         pwr_on = SD_POWER_ON;
 110
 111         if ((pcr->flags & PCR_MS_PMOS) && (card == RTSX_MS_CARD)) {
 112                 pwr_mask = MS_POWER_MASK;
 113                 partial_pwr_on = MS_PARTIAL_POWER_ON;
 114                 pwr_on = MS_POWER_ON;
 115         }
 116
 117         rtsx_pci_init_cmd(pcr);
 118         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 119                         pwr_mask, partial_pwr_on);
 120         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 121                         LDO3318_PWR_MASK, 0x04);
 122         err = rtsx_pci_send_cmd(pcr, 100);
 123         if (err < 0)
 124                 return err;
 125
 126         /* To avoid too large in-rush current */
 127         udelay(150);
 128
 129         rtsx_pci_init_cmd(pcr);
 130         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL, pwr_mask, pwr_on);
 131         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 132                         LDO3318_PWR_MASK, 0x00);
 133         err = rtsx_pci_send_cmd(pcr, 100);
 134         if (err < 0)
 135                 return err;
 136
 137         return 0;
 138 }
 139
 140 static int rts5209_card_power_off(struct rtsx_pcr *pcr, int card)
 141 {
 142         u8 pwr_mask, pwr_off;
 143
 144         pwr_mask = SD_POWER_MASK;
 145         pwr_off = SD_POWER_OFF;
 146
 147         if ((pcr->flags & PCR_MS_PMOS) && (card == RTSX_MS_CARD)) {
 148                 pwr_mask = MS_POWER_MASK;
 149                 pwr_off = MS_POWER_OFF;
 150         }
 151
 152         rtsx_pci_init_cmd(pcr);
 153         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 154                         pwr_mask | PMOS_STRG_MASK, pwr_off | PMOS_STRG_400mA);
 155         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 156                         LDO3318_PWR_MASK, 0x06);
 157         return rtsx_pci_send_cmd(pcr, 100);
 158 }
 159
 160 static int rts5209_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 161 {
 162         int err;
 163
 164         if (voltage == OUTPUT_3V3) {
 165                 err = rtsx_pci_write_register(pcr,
 166                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_3v3);
 167                 if (err < 0)
 168                         return err;
 169                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 170                 if (err < 0)
 171                         return err;
 172         } else if (voltage == OUTPUT_1V8) {
 173                 err = rtsx_pci_write_register(pcr,
 174                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_1v8);
 175                 if (err < 0)
 176                         return err;
 177                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
 178                 if (err < 0)
 179                         return err;
 180         } else {
 181                 return -EINVAL;
 182         }
 183
 184         return 0;
 185 }
 186
 187 static const struct pcr_ops rts5209_pcr_ops = {
 188         .fetch_vendor_settings = rts5209_fetch_vendor_settings,
 189         .extra_init_hw = rts5209_extra_init_hw,
 190         .optimize_phy = rts5209_optimize_phy,
 191         .turn_on_led = rts5209_turn_on_led,
 192         .turn_off_led = rts5209_turn_off_led,
 193         .enable_auto_blink = rts5209_enable_auto_blink,
 194         .disable_auto_blink = rts5209_disable_auto_blink,
 195         .card_power_on = rts5209_card_power_on,
 196         .card_power_off = rts5209_card_power_off,
 197         .switch_output_voltage = rts5209_switch_output_voltage,
 198         .cd_deglitch = NULL,
 199         .conv_clk_and_div_n = NULL,
 200 };
 201
 202 /* SD Pull Control Enable:
 203  *     SD_DAT[3:0] ==> pull up
 204  *     SD_CD       ==> pull up
 205  *     SD_WP       ==> pull up
 206  *     SD_CMD      ==> pull up
 207  *     SD_CLK      ==> pull down
 208  */
 209 static const u32 rts5209_sd_pull_ctl_enable_tbl[] = {
 210         RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
 211         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 212         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 213         0,
 214 };
 215
 216 /* SD Pull Control Disable:
 217  *     SD_DAT[3:0] ==> pull down
 218  *     SD_CD       ==> pull up
 219  *     SD_WP       ==> pull down
 220  *     SD_CMD      ==> pull down
 221  *     SD_CLK      ==> pull down
 222  */
 223 static const u32 rts5209_sd_pull_ctl_disable_tbl[] = {
 224         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x55),
 225         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 226         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 227         0,
 228 };
 229
 230 /* MS Pull Control Enable:
 231  *     MS CD       ==> pull up
 232  *     others      ==> pull down
 233  */
 234 static const u32 rts5209_ms_pull_ctl_enable_tbl[] = {
 235         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 236         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 237         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 238         0,
 239 };
 240
 241 /* MS Pull Control Disable:
 242  *     MS CD       ==> pull up
 243  *     others      ==> pull down
 244  */
 245 static const u32 rts5209_ms_pull_ctl_disable_tbl[] = {
 246         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 247         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 248         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 249         0,
 250 };
 251
 252 void rts5209_init_params(struct rtsx_pcr *pcr)
 253 {
 254         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 |
 255                 EXTRA_CAPS_SD_SDR104 | EXTRA_CAPS_MMC_8BIT;
 256         pcr->num_slots = 2;
 257         pcr->ops = &rts5209_pcr_ops;
 258
 259         pcr->flags = 0;
 260         pcr->card_drive_sel = RTS5209_CARD_DRIVE_DEFAULT;
 261         pcr->sd30_drive_sel_1v8 = DRIVER_TYPE_B;
 262         pcr->sd30_drive_sel_3v3 = DRIVER_TYPE_D;
 263         pcr->aspm_en = ASPM_L1_EN;
 264
 265         pcr->ic_version = rts5209_get_ic_version(pcr);
 266         pcr->sd_pull_ctl_enable_tbl = rts5209_sd_pull_ctl_enable_tbl;
 267         pcr->sd_pull_ctl_disable_tbl = rts5209_sd_pull_ctl_disable_tbl;
 268         pcr->ms_pull_ctl_enable_tbl = rts5209_ms_pull_ctl_enable_tbl;
 269         pcr->ms_pull_ctl_disable_tbl = rts5209_ms_pull_ctl_disable_tbl;
 270 }