drivers/mfd/rts5209.c

   1 /* Driver for Realtek PCI-Express card reader
   2  *
   3  * Copyright(c) 2009-2013 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  */
  21
  22 #include <linux/module.h>
  23 #include <linux/delay.h>
  24 #include <linux/mfd/rtsx_pci.h>
  25
  26 #include "rtsx_pcr.h"
  27
  28 static u8 rts5209_get_ic_version(struct rtsx_pcr *pcr)
  29 {
  30         u8 val;
  31
  32         val = rtsx_pci_readb(pcr, 0x1C);
  33         return val & 0x0F;
  34 }
  35
  36 static void rts5209_fetch_vendor_settings(struct rtsx_pcr *pcr)
  37 {
  38         u32 reg;
  39
  40         rtsx_pci_read_config_dword(pcr, PCR_SETTING_REG1, &reg);
  41         pcr_dbg(pcr, "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG1, reg);
  42
  43         if (rts5209_vendor_setting1_valid(reg)) {
  44                 if (rts5209_reg_check_ms_pmos(reg))
  45                         pcr->flags |= PCR_MS_PMOS;
  46                 pcr->aspm_en = rts5209_reg_to_aspm(reg);
  47         }
  48
  49         rtsx_pci_read_config_dword(pcr, PCR_SETTING_REG2, &reg);
  50         pcr_dbg(pcr, "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG2, reg);
  51
  52         if (rts5209_vendor_setting2_valid(reg)) {
  53                 pcr->sd30_drive_sel_1v8 =
  54                         rts5209_reg_to_sd30_drive_sel_1v8(reg);
  55                 pcr->sd30_drive_sel_3v3 =
  56                         rts5209_reg_to_sd30_drive_sel_3v3(reg);
  57                 pcr->card_drive_sel = rts5209_reg_to_card_drive_sel(reg);
  58         }
  59 }
  60
  61 static void rts5209_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
  62 {
  63         rtsx_pci_write_register(pcr, FPDCTL, 0x07, 0x07);
  64 }
  65
  66 static int rts5209_extra_init_hw(struct rtsx_pcr *pcr)
  67 {
  68         rtsx_pci_init_cmd(pcr);
  69
  70         /* Turn off LED */
  71         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO, 0xFF, 0x03);
  72         /* Reset ASPM state to default value */
  73         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, ASPM_FORCE_CTL, 0x3F, 0);
  74         /* Force CLKREQ# PIN to drive 0 to request clock */
  75         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG, 0x08, 0x08);
  76         /* Configure GPIO as output */
  77         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO_DIR, 0xFF, 0x03);
  78         /* Configure driving */
  79         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_DRIVE_SEL,
  80                         0xFF, pcr->sd30_drive_sel_3v3);
  81
  82         return rtsx_pci_send_cmd(pcr, 100);
  83 }
  84
  85 static int rts5209_optimize_phy(struct rtsx_pcr *pcr)
  86 {
  87         return rtsx_pci_write_phy_register(pcr, 0x00, 0xB966);
  88 }
  89
  90 static int rts5209_turn_on_led(struct rtsx_pcr *pcr)
  91 {
  92         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
  93 }
  94
  95 static int rts5209_turn_off_led(struct rtsx_pcr *pcr)
  96 {
  97         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
  98 }
  99
 100 static int rts5209_enable_auto_blink(struct rtsx_pcr *pcr)
 101 {
 102         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
 103 }
 104
 105 static int rts5209_disable_auto_blink(struct rtsx_pcr *pcr)
 106 {
 107         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
 108 }
 109
 110 static int rts5209_card_power_on(struct rtsx_pcr *pcr, int card)
 111 {
 112         int err;
 113         u8 pwr_mask, partial_pwr_on, pwr_on;
 114
 115         pwr_mask = SD_POWER_MASK;
 116         partial_pwr_on = SD_PARTIAL_POWER_ON;
 117         pwr_on = SD_POWER_ON;
 118
 119         if ((pcr->flags & PCR_MS_PMOS) && (card == RTSX_MS_CARD)) {
 120                 pwr_mask = MS_POWER_MASK;
 121                 partial_pwr_on = MS_PARTIAL_POWER_ON;
 122                 pwr_on = MS_POWER_ON;
 123         }
 124
 125         rtsx_pci_init_cmd(pcr);
 126         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 127                         pwr_mask, partial_pwr_on);
 128         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 129                         LDO3318_PWR_MASK, 0x04);
 130         err = rtsx_pci_send_cmd(pcr, 100);
 131         if (err < 0)
 132                 return err;
 133
 134         /* To avoid too large in-rush current */
 135         udelay(150);
 136
 137         rtsx_pci_init_cmd(pcr);
 138         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL, pwr_mask, pwr_on);
 139         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 140                         LDO3318_PWR_MASK, 0x00);
 141         return rtsx_pci_send_cmd(pcr, 100);
 142 }
 143
 144 static int rts5209_card_power_off(struct rtsx_pcr *pcr, int card)
 145 {
 146         u8 pwr_mask, pwr_off;
 147
 148         pwr_mask = SD_POWER_MASK;
 149         pwr_off = SD_POWER_OFF;
 150
 151         if ((pcr->flags & PCR_MS_PMOS) && (card == RTSX_MS_CARD)) {
 152                 pwr_mask = MS_POWER_MASK;
 153                 pwr_off = MS_POWER_OFF;
 154         }
 155
 156         rtsx_pci_init_cmd(pcr);
 157         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 158                         pwr_mask | PMOS_STRG_MASK, pwr_off | PMOS_STRG_400mA);
 159         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 160                         LDO3318_PWR_MASK, 0x06);
 161         return rtsx_pci_send_cmd(pcr, 100);
 162 }
 163
 164 static int rts5209_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 165 {
 166         int err;
 167
 168         if (voltage == OUTPUT_3V3) {
 169                 err = rtsx_pci_write_register(pcr,
 170                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_3v3);
 171                 if (err < 0)
 172                         return err;
 173                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 174                 if (err < 0)
 175                         return err;
 176         } else if (voltage == OUTPUT_1V8) {
 177                 err = rtsx_pci_write_register(pcr,
 178                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_1v8);
 179                 if (err < 0)
 180                         return err;
 181                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
 182                 if (err < 0)
 183                         return err;
 184         } else {
 185                 return -EINVAL;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static const struct pcr_ops rts5209_pcr_ops = {
 192         .fetch_vendor_settings = rts5209_fetch_vendor_settings,
 193         .extra_init_hw = rts5209_extra_init_hw,
 194         .optimize_phy = rts5209_optimize_phy,
 195         .turn_on_led = rts5209_turn_on_led,
 196         .turn_off_led = rts5209_turn_off_led,
 197         .enable_auto_blink = rts5209_enable_auto_blink,
 198         .disable_auto_blink = rts5209_disable_auto_blink,
 199         .card_power_on = rts5209_card_power_on,
 200         .card_power_off = rts5209_card_power_off,
 201         .switch_output_voltage = rts5209_switch_output_voltage,
 202         .cd_deglitch = NULL,
 203         .conv_clk_and_div_n = NULL,
 204         .force_power_down = rts5209_force_power_down,
 205 };
 206
 207 /* SD Pull Control Enable:
 208  *     SD_DAT[3:0] ==> pull up
 209  *     SD_CD       ==> pull up
 210  *     SD_WP       ==> pull up
 211  *     SD_CMD      ==> pull up
 212  *     SD_CLK      ==> pull down
 213  */
 214 static const u32 rts5209_sd_pull_ctl_enable_tbl[] = {
 215         RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
 216         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 217         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 218         0,
 219 };
 220
 221 /* SD Pull Control Disable:
 222  *     SD_DAT[3:0] ==> pull down
 223  *     SD_CD       ==> pull up
 224  *     SD_WP       ==> pull down
 225  *     SD_CMD      ==> pull down
 226  *     SD_CLK      ==> pull down
 227  */
 228 static const u32 rts5209_sd_pull_ctl_disable_tbl[] = {
 229         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x55),
 230         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 231         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 232         0,
 233 };
 234
 235 /* MS Pull Control Enable:
 236  *     MS CD       ==> pull up
 237  *     others      ==> pull down
 238  */
 239 static const u32 rts5209_ms_pull_ctl_enable_tbl[] = {
 240         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 241         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 242         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 243         0,
 244 };
 245
 246 /* MS Pull Control Disable:
 247  *     MS CD       ==> pull up
 248  *     others      ==> pull down
 249  */
 250 static const u32 rts5209_ms_pull_ctl_disable_tbl[] = {
 251         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 252         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 253         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 254         0,
 255 };
 256
 257 void rts5209_init_params(struct rtsx_pcr *pcr)
 258 {
 259         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 |
 260                 EXTRA_CAPS_SD_SDR104 | EXTRA_CAPS_MMC_8BIT;
 261         pcr->num_slots = 2;
 262         pcr->ops = &rts5209_pcr_ops;
 263
 264         pcr->flags = 0;
 265         pcr->card_drive_sel = RTS5209_CARD_DRIVE_DEFAULT;
 266         pcr->sd30_drive_sel_1v8 = DRIVER_TYPE_B;
 267         pcr->sd30_drive_sel_3v3 = DRIVER_TYPE_D;
 268         pcr->aspm_en = ASPM_L1_EN;
 269         pcr->tx_initial_phase = SET_CLOCK_PHASE(27, 27, 16);
 270         pcr->rx_initial_phase = SET_CLOCK_PHASE(24, 6, 5);
 271
 272         pcr->ic_version = rts5209_get_ic_version(pcr);
 273         pcr->sd_pull_ctl_enable_tbl = rts5209_sd_pull_ctl_enable_tbl;
 274         pcr->sd_pull_ctl_disable_tbl = rts5209_sd_pull_ctl_disable_tbl;
 275         pcr->ms_pull_ctl_enable_tbl = rts5209_ms_pull_ctl_enable_tbl;
 276         pcr->ms_pull_ctl_disable_tbl = rts5209_ms_pull_ctl_disable_tbl;
 277 }