drivers/mfd/rts5227.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  *   Roger Tseng <rogerable@realtek.com>
  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 void rts5227_fill_driving(struct rtsx_pcr *pcr, u8 voltage)
  30 {
  31         u8 driving_3v3[4][3] = {
  32                 {0x13, 0x13, 0x13},
  33                 {0x96, 0x96, 0x96},
  34                 {0x7F, 0x7F, 0x7F},
  35                 {0x96, 0x96, 0x96},
  36         };
  37         u8 driving_1v8[4][3] = {
  38                 {0x99, 0x99, 0x99},
  39                 {0xAA, 0xAA, 0xAA},
  40                 {0xFE, 0xFE, 0xFE},
  41                 {0xB3, 0xB3, 0xB3},
  42         };
  43         u8 (*driving)[3], drive_sel;
  44
  45         if (voltage == OUTPUT_3V3) {
  46                 driving = driving_3v3;
  47                 drive_sel = pcr->sd30_drive_sel_3v3;
  48         } else {
  49                 driving = driving_1v8;
  50                 drive_sel = pcr->sd30_drive_sel_1v8;
  51         }
  52
  53         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_CLK_DRIVE_SEL,
  54                         0xFF, driving[drive_sel][0]);
  55         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_CMD_DRIVE_SEL,
  56                         0xFF, driving[drive_sel][1]);
  57         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_DAT_DRIVE_SEL,
  58                         0xFF, driving[drive_sel][2]);
  59 }
  60
  61 static void rts5227_fetch_vendor_settings(struct rtsx_pcr *pcr)
  62 {
  63         u32 reg;
  64
  65         rtsx_pci_read_config_dword(pcr, PCR_SETTING_REG1, &reg);
  66         dev_dbg(&(pcr->pci->dev), "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG1, reg);
  67
  68         if (!rtsx_vendor_setting_valid(reg))
  69                 return;
  70
  71         pcr->aspm_en = rtsx_reg_to_aspm(reg);
  72         pcr->sd30_drive_sel_1v8 = rtsx_reg_to_sd30_drive_sel_1v8(reg);
  73         pcr->card_drive_sel &= 0x3F;
  74         pcr->card_drive_sel |= rtsx_reg_to_card_drive_sel(reg);
  75
  76         rtsx_pci_read_config_dword(pcr, PCR_SETTING_REG2, &reg);
  77         dev_dbg(&(pcr->pci->dev), "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG2, reg);
  78         pcr->sd30_drive_sel_3v3 = rtsx_reg_to_sd30_drive_sel_3v3(reg);
  79         if (rtsx_reg_check_reverse_socket(reg))
  80                 pcr->flags |= PCR_REVERSE_SOCKET;
  81 }
  82
  83 static void rts5227_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
  84 {
  85         /* Set relink_time to 0 */
  86         rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 1, 0xFF, 0);
  87         rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 2, 0xFF, 0);
  88         rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 3, 0x01, 0);
  89
  90         if (pm_state == HOST_ENTER_S3)
  91                 rtsx_pci_write_register(pcr, PM_CTRL3, 0x10, 0x10);
  92
  93         rtsx_pci_write_register(pcr, FPDCTL, 0x03, 0x03);
  94 }
  95
  96 static int rts5227_extra_init_hw(struct rtsx_pcr *pcr)
  97 {
  98         u16 cap;
  99
 100         rtsx_pci_init_cmd(pcr);
 101
 102         /* Configure GPIO as output */
 103         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, GPIO_CTL, 0x02, 0x02);
 104         /* Reset ASPM state to default value */
 105         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, ASPM_FORCE_CTL, 0x3F, 0);
 106         /* Switch LDO3318 source from DV33 to card_3v3 */
 107         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x00);
 108         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x01);
 109         /* LED shine disabled, set initial shine cycle period */
 110         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, OLT_LED_CTL, 0x0F, 0x02);
 111         /* Configure LTR */
 112         pcie_capability_read_word(pcr->pci, PCI_EXP_DEVCTL2, &cap);
 113         if (cap & PCI_EXP_DEVCTL2_LTR_EN)
 114                 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LTR_CTL, 0xFF, 0xA3);
 115         /* Configure OBFF */
 116         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, OBFF_CFG, 0x03, 0x03);
 117         /* Configure driving */
 118         rts5227_fill_driving(pcr, OUTPUT_3V3);
 119         /* Configure force_clock_req */
 120         if (pcr->flags & PCR_REVERSE_SOCKET)
 121                 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
 122                                 AUTOLOAD_CFG_BASE + 3, 0xB8, 0xB8);
 123         else
 124                 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD,
 125                                 AUTOLOAD_CFG_BASE + 3, 0xB8, 0x88);
 126         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PM_CTRL3, 0x10, 0x00);
 127
 128         return rtsx_pci_send_cmd(pcr, 100);
 129 }
 130
 131 static int rts5227_optimize_phy(struct rtsx_pcr *pcr)
 132 {
 133         int err;
 134
 135         err = rtsx_gops_pm_reset(pcr);
 136         if (err < 0)
 137                 return err;
 138
 139         /* Optimize RX sensitivity */
 140         return rtsx_pci_write_phy_register(pcr, 0x00, 0xBA42);
 141 }
 142
 143 static int rts5227_turn_on_led(struct rtsx_pcr *pcr)
 144 {
 145         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x02);
 146 }
 147
 148 static int rts5227_turn_off_led(struct rtsx_pcr *pcr)
 149 {
 150         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x00);
 151 }
 152
 153 static int rts5227_enable_auto_blink(struct rtsx_pcr *pcr)
 154 {
 155         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x08);
 156 }
 157
 158 static int rts5227_disable_auto_blink(struct rtsx_pcr *pcr)
 159 {
 160         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x00);
 161 }
 162
 163 static int rts5227_card_power_on(struct rtsx_pcr *pcr, int card)
 164 {
 165         int err;
 166
 167         rtsx_pci_init_cmd(pcr);
 168         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 169                         SD_POWER_MASK, SD_PARTIAL_POWER_ON);
 170         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 171                         LDO3318_PWR_MASK, 0x02);
 172         err = rtsx_pci_send_cmd(pcr, 100);
 173         if (err < 0)
 174                 return err;
 175
 176         /* To avoid too large in-rush current */
 177         udelay(150);
 178
 179         rtsx_pci_init_cmd(pcr);
 180         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 181                         SD_POWER_MASK, SD_POWER_ON);
 182         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 183                         LDO3318_PWR_MASK, 0x06);
 184         err = rtsx_pci_send_cmd(pcr, 100);
 185         if (err < 0)
 186                 return err;
 187
 188         return 0;
 189 }
 190
 191 static int rts5227_card_power_off(struct rtsx_pcr *pcr, int card)
 192 {
 193         rtsx_pci_init_cmd(pcr);
 194         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 195                         SD_POWER_MASK | PMOS_STRG_MASK,
 196                         SD_POWER_OFF | PMOS_STRG_400mA);
 197         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 198                         LDO3318_PWR_MASK, 0X00);
 199         return rtsx_pci_send_cmd(pcr, 100);
 200 }
 201
 202 static int rts5227_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 203 {
 204         int err;
 205
 206         if (voltage == OUTPUT_3V3) {
 207                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 208                 if (err < 0)
 209                         return err;
 210         } else if (voltage == OUTPUT_1V8) {
 211                 err = rtsx_pci_write_phy_register(pcr, 0x11, 0x3C02);
 212                 if (err < 0)
 213                         return err;
 214                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C80 | 0x24);
 215                 if (err < 0)
 216                         return err;
 217         } else {
 218                 return -EINVAL;
 219         }
 220
 221         /* set pad drive */
 222         rtsx_pci_init_cmd(pcr);
 223         rts5227_fill_driving(pcr, voltage);
 224         return rtsx_pci_send_cmd(pcr, 100);
 225 }
 226
 227 static const struct pcr_ops rts5227_pcr_ops = {
 228         .fetch_vendor_settings = rts5227_fetch_vendor_settings,
 229         .extra_init_hw = rts5227_extra_init_hw,
 230         .optimize_phy = rts5227_optimize_phy,
 231         .turn_on_led = rts5227_turn_on_led,
 232         .turn_off_led = rts5227_turn_off_led,
 233         .enable_auto_blink = rts5227_enable_auto_blink,
 234         .disable_auto_blink = rts5227_disable_auto_blink,
 235         .card_power_on = rts5227_card_power_on,
 236         .card_power_off = rts5227_card_power_off,
 237         .switch_output_voltage = rts5227_switch_output_voltage,
 238         .cd_deglitch = NULL,
 239         .conv_clk_and_div_n = NULL,
 240         .force_power_down = rts5227_force_power_down,
 241 };
 242
 243 /* SD Pull Control Enable:
 244  *     SD_DAT[3:0] ==> pull up
 245  *     SD_CD       ==> pull up
 246  *     SD_WP       ==> pull up
 247  *     SD_CMD      ==> pull up
 248  *     SD_CLK      ==> pull down
 249  */
 250 static const u32 rts5227_sd_pull_ctl_enable_tbl[] = {
 251         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 252         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 253         0,
 254 };
 255
 256 /* SD Pull Control Disable:
 257  *     SD_DAT[3:0] ==> pull down
 258  *     SD_CD       ==> pull up
 259  *     SD_WP       ==> pull down
 260  *     SD_CMD      ==> pull down
 261  *     SD_CLK      ==> pull down
 262  */
 263 static const u32 rts5227_sd_pull_ctl_disable_tbl[] = {
 264         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 265         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 266         0,
 267 };
 268
 269 /* MS Pull Control Enable:
 270  *     MS CD       ==> pull up
 271  *     others      ==> pull down
 272  */
 273 static const u32 rts5227_ms_pull_ctl_enable_tbl[] = {
 274         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 275         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 276         0,
 277 };
 278
 279 /* MS Pull Control Disable:
 280  *     MS CD       ==> pull up
 281  *     others      ==> pull down
 282  */
 283 static const u32 rts5227_ms_pull_ctl_disable_tbl[] = {
 284         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 285         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 286         0,
 287 };
 288
 289 void rts5227_init_params(struct rtsx_pcr *pcr)
 290 {
 291         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 292         pcr->num_slots = 2;
 293         pcr->ops = &rts5227_pcr_ops;
 294
 295         pcr->flags = 0;
 296         pcr->card_drive_sel = RTSX_CARD_DRIVE_DEFAULT;
 297         pcr->sd30_drive_sel_1v8 = CFG_DRIVER_TYPE_B;
 298         pcr->sd30_drive_sel_3v3 = CFG_DRIVER_TYPE_B;
 299         pcr->aspm_en = ASPM_L1_EN;
 300         pcr->tx_initial_phase = SET_CLOCK_PHASE(27, 27, 15);
 301         pcr->rx_initial_phase = SET_CLOCK_PHASE(30, 7, 7);
 302
 303         pcr->sd_pull_ctl_enable_tbl = rts5227_sd_pull_ctl_enable_tbl;
 304         pcr->sd_pull_ctl_disable_tbl = rts5227_sd_pull_ctl_disable_tbl;
 305         pcr->ms_pull_ctl_enable_tbl = rts5227_ms_pull_ctl_enable_tbl;
 306         pcr->ms_pull_ctl_disable_tbl = rts5227_ms_pull_ctl_disable_tbl;
 307 }