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 void rts5209_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
  63 {
  64         rtsx_pci_write_register(pcr, FPDCTL, 0x07, 0x07);
  65 }
  66
  67 static int rts5209_extra_init_hw(struct rtsx_pcr *pcr)
  68 {
  69         rtsx_pci_init_cmd(pcr);
  70
  71         /* Turn off LED */
  72         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO, 0xFF, 0x03);
  73         /* Reset ASPM state to default value */
  74         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, ASPM_FORCE_CTL, 0x3F, 0);
  75         /* Force CLKREQ# PIN to drive 0 to request clock */
  76         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG, 0x08, 0x08);
  77         /* Configure GPIO as output */
  78         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_GPIO_DIR, 0xFF, 0x03);
  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 rts5209_optimize_phy(struct rtsx_pcr *pcr)
  87 {
  88         return rtsx_pci_write_phy_register(pcr, 0x00, 0xB966);
  89 }
  90
  91 static int rts5209_turn_on_led(struct rtsx_pcr *pcr)
  92 {
  93         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
  94 }
  95
  96 static int rts5209_turn_off_led(struct rtsx_pcr *pcr)
  97 {
  98         return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
  99 }
 100
 101 static int rts5209_enable_auto_blink(struct rtsx_pcr *pcr)
 102 {
 103         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
 104 }
 105
 106 static int rts5209_disable_auto_blink(struct rtsx_pcr *pcr)
 107 {
 108         return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
 109 }
 110
 111 static int rts5209_card_power_on(struct rtsx_pcr *pcr, int card)
 112 {
 113         int err;
 114         u8 pwr_mask, partial_pwr_on, pwr_on;
 115
 116         pwr_mask = SD_POWER_MASK;
 117         partial_pwr_on = SD_PARTIAL_POWER_ON;
 118         pwr_on = SD_POWER_ON;
 119
 120         if ((pcr->flags & PCR_MS_PMOS) && (card == RTSX_MS_CARD)) {
 121                 pwr_mask = MS_POWER_MASK;
 122                 partial_pwr_on = MS_PARTIAL_POWER_ON;
 123                 pwr_on = MS_POWER_ON;
 124         }
 125
 126         rtsx_pci_init_cmd(pcr);
 127         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 128                         pwr_mask, partial_pwr_on);
 129         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 130                         LDO3318_PWR_MASK, 0x04);
 131         err = rtsx_pci_send_cmd(pcr, 100);
 132         if (err < 0)
 133                 return err;
 134
 135         /* To avoid too large in-rush current */
 136         udelay(150);
 137
 138         rtsx_pci_init_cmd(pcr);
 139         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL, pwr_mask, pwr_on);
 140         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 141                         LDO3318_PWR_MASK, 0x00);
 142         err = rtsx_pci_send_cmd(pcr, 100);
 143         if (err < 0)
 144                 return err;
 145
 146         return 0;
 147 }
 148
 149 static int rts5209_card_power_off(struct rtsx_pcr *pcr, int card)
 150 {
 151         u8 pwr_mask, pwr_off;
 152
 153         pwr_mask = SD_POWER_MASK;
 154         pwr_off = SD_POWER_OFF;
 155
 156         if ((pcr->flags & PCR_MS_PMOS) && (card == RTSX_MS_CARD)) {
 157                 pwr_mask = MS_POWER_MASK;
 158                 pwr_off = MS_POWER_OFF;
 159         }
 160
 161         rtsx_pci_init_cmd(pcr);
 162         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 163                         pwr_mask | PMOS_STRG_MASK, pwr_off | PMOS_STRG_400mA);
 164         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 165                         LDO3318_PWR_MASK, 0x06);
 166         return rtsx_pci_send_cmd(pcr, 100);
 167 }
 168
 169 static int rts5209_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 170 {
 171         int err;
 172
 173         if (voltage == OUTPUT_3V3) {
 174                 err = rtsx_pci_write_register(pcr,
 175                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_3v3);
 176                 if (err < 0)
 177                         return err;
 178                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 179                 if (err < 0)
 180                         return err;
 181         } else if (voltage == OUTPUT_1V8) {
 182                 err = rtsx_pci_write_register(pcr,
 183                                 SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_1v8);
 184                 if (err < 0)
 185                         return err;
 186                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
 187                 if (err < 0)
 188                         return err;
 189         } else {
 190                 return -EINVAL;
 191         }
 192
 193         return 0;
 194 }
 195
 196 static const struct pcr_ops rts5209_pcr_ops = {
 197         .fetch_vendor_settings = rts5209_fetch_vendor_settings,
 198         .extra_init_hw = rts5209_extra_init_hw,
 199         .optimize_phy = rts5209_optimize_phy,
 200         .turn_on_led = rts5209_turn_on_led,
 201         .turn_off_led = rts5209_turn_off_led,
 202         .enable_auto_blink = rts5209_enable_auto_blink,
 203         .disable_auto_blink = rts5209_disable_auto_blink,
 204         .card_power_on = rts5209_card_power_on,
 205         .card_power_off = rts5209_card_power_off,
 206         .switch_output_voltage = rts5209_switch_output_voltage,
 207         .cd_deglitch = NULL,
 208         .conv_clk_and_div_n = NULL,
 209         .force_power_down = rts5209_force_power_down,
 210 };
 211
 212 /* SD Pull Control Enable:
 213  *     SD_DAT[3:0] ==> pull up
 214  *     SD_CD       ==> pull up
 215  *     SD_WP       ==> pull up
 216  *     SD_CMD      ==> pull up
 217  *     SD_CLK      ==> pull down
 218  */
 219 static const u32 rts5209_sd_pull_ctl_enable_tbl[] = {
 220         RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
 221         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 222         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 223         0,
 224 };
 225
 226 /* SD Pull Control Disable:
 227  *     SD_DAT[3:0] ==> pull down
 228  *     SD_CD       ==> pull up
 229  *     SD_WP       ==> pull down
 230  *     SD_CMD      ==> pull down
 231  *     SD_CLK      ==> pull down
 232  */
 233 static const u32 rts5209_sd_pull_ctl_disable_tbl[] = {
 234         RTSX_REG_PAIR(CARD_PULL_CTL1, 0x55),
 235         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 236         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 237         0,
 238 };
 239
 240 /* MS Pull Control Enable:
 241  *     MS CD       ==> pull up
 242  *     others      ==> pull down
 243  */
 244 static const u32 rts5209_ms_pull_ctl_enable_tbl[] = {
 245         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 246         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 247         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 248         0,
 249 };
 250
 251 /* MS Pull Control Disable:
 252  *     MS CD       ==> pull up
 253  *     others      ==> pull down
 254  */
 255 static const u32 rts5209_ms_pull_ctl_disable_tbl[] = {
 256         RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 257         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 258         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 259         0,
 260 };
 261
 262 void rts5209_init_params(struct rtsx_pcr *pcr)
 263 {
 264         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 |
 265                 EXTRA_CAPS_SD_SDR104 | EXTRA_CAPS_MMC_8BIT;
 266         pcr->num_slots = 2;
 267         pcr->ops = &rts5209_pcr_ops;
 268
 269         pcr->flags = 0;
 270         pcr->card_drive_sel = RTS5209_CARD_DRIVE_DEFAULT;
 271         pcr->sd30_drive_sel_1v8 = DRIVER_TYPE_B;
 272         pcr->sd30_drive_sel_3v3 = DRIVER_TYPE_D;
 273         pcr->aspm_en = ASPM_L1_EN;
 274
 275         pcr->ic_version = rts5209_get_ic_version(pcr);
 276         pcr->sd_pull_ctl_enable_tbl = rts5209_sd_pull_ctl_enable_tbl;
 277         pcr->sd_pull_ctl_disable_tbl = rts5209_sd_pull_ctl_disable_tbl;
 278         pcr->ms_pull_ctl_enable_tbl = rts5209_ms_pull_ctl_enable_tbl;
 279         pcr->ms_pull_ctl_disable_tbl = rts5209_ms_pull_ctl_disable_tbl;
 280 }