kernel/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         pcr_dbg(pcr, "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         pcr_dbg(pcr, "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, PETXCFG, 0xB8, 0xB8);
 122         else
 123                 rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG, 0xB8, 0x88);
 124         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PM_CTRL3, 0x10, 0x00);
 125
 126         return rtsx_pci_send_cmd(pcr, 100);
 127 }
 128
 129 static int rts5227_optimize_phy(struct rtsx_pcr *pcr)
 130 {
 131         int err;
 132
 133         err = rtsx_pci_write_register(pcr, PM_CTRL3, D3_DELINK_MODE_EN, 0x00);
 134         if (err < 0)
 135                 return err;
 136
 137         /* Optimize RX sensitivity */
 138         return rtsx_pci_write_phy_register(pcr, 0x00, 0xBA42);
 139 }
 140
 141 static int rts5227_turn_on_led(struct rtsx_pcr *pcr)
 142 {
 143         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x02);
 144 }
 145
 146 static int rts5227_turn_off_led(struct rtsx_pcr *pcr)
 147 {
 148         return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x00);
 149 }
 150
 151 static int rts5227_enable_auto_blink(struct rtsx_pcr *pcr)
 152 {
 153         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x08);
 154 }
 155
 156 static int rts5227_disable_auto_blink(struct rtsx_pcr *pcr)
 157 {
 158         return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x00);
 159 }
 160
 161 static int rts5227_card_power_on(struct rtsx_pcr *pcr, int card)
 162 {
 163         int err;
 164
 165         rtsx_pci_init_cmd(pcr);
 166         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 167                         SD_POWER_MASK, SD_PARTIAL_POWER_ON);
 168         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 169                         LDO3318_PWR_MASK, 0x02);
 170         err = rtsx_pci_send_cmd(pcr, 100);
 171         if (err < 0)
 172                 return err;
 173
 174         /* To avoid too large in-rush current */
 175         udelay(150);
 176
 177         rtsx_pci_init_cmd(pcr);
 178         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 179                         SD_POWER_MASK, SD_POWER_ON);
 180         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 181                         LDO3318_PWR_MASK, 0x06);
 182         err = rtsx_pci_send_cmd(pcr, 100);
 183         if (err < 0)
 184                 return err;
 185
 186         return 0;
 187 }
 188
 189 static int rts5227_card_power_off(struct rtsx_pcr *pcr, int card)
 190 {
 191         rtsx_pci_init_cmd(pcr);
 192         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 193                         SD_POWER_MASK | PMOS_STRG_MASK,
 194                         SD_POWER_OFF | PMOS_STRG_400mA);
 195         rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 196                         LDO3318_PWR_MASK, 0X00);
 197         return rtsx_pci_send_cmd(pcr, 100);
 198 }
 199
 200 static int rts5227_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 201 {
 202         int err;
 203
 204         if (voltage == OUTPUT_3V3) {
 205                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 206                 if (err < 0)
 207                         return err;
 208         } else if (voltage == OUTPUT_1V8) {
 209                 err = rtsx_pci_write_phy_register(pcr, 0x11, 0x3C02);
 210                 if (err < 0)
 211                         return err;
 212                 err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C80 | 0x24);
 213                 if (err < 0)
 214                         return err;
 215         } else {
 216                 return -EINVAL;
 217         }
 218
 219         /* set pad drive */
 220         rtsx_pci_init_cmd(pcr);
 221         rts5227_fill_driving(pcr, voltage);
 222         return rtsx_pci_send_cmd(pcr, 100);
 223 }
 224
 225 static const struct pcr_ops rts5227_pcr_ops = {
 226         .fetch_vendor_settings = rts5227_fetch_vendor_settings,
 227         .extra_init_hw = rts5227_extra_init_hw,
 228         .optimize_phy = rts5227_optimize_phy,
 229         .turn_on_led = rts5227_turn_on_led,
 230         .turn_off_led = rts5227_turn_off_led,
 231         .enable_auto_blink = rts5227_enable_auto_blink,
 232         .disable_auto_blink = rts5227_disable_auto_blink,
 233         .card_power_on = rts5227_card_power_on,
 234         .card_power_off = rts5227_card_power_off,
 235         .switch_output_voltage = rts5227_switch_output_voltage,
 236         .cd_deglitch = NULL,
 237         .conv_clk_and_div_n = NULL,
 238         .force_power_down = rts5227_force_power_down,
 239 };
 240
 241 /* SD Pull Control Enable:
 242  *     SD_DAT[3:0] ==> pull up
 243  *     SD_CD       ==> pull up
 244  *     SD_WP       ==> pull up
 245  *     SD_CMD      ==> pull up
 246  *     SD_CLK      ==> pull down
 247  */
 248 static const u32 rts5227_sd_pull_ctl_enable_tbl[] = {
 249         RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 250         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 251         0,
 252 };
 253
 254 /* SD Pull Control Disable:
 255  *     SD_DAT[3:0] ==> pull down
 256  *     SD_CD       ==> pull up
 257  *     SD_WP       ==> pull down
 258  *     SD_CMD      ==> pull down
 259  *     SD_CLK      ==> pull down
 260  */
 261 static const u32 rts5227_sd_pull_ctl_disable_tbl[] = {
 262         RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 263         RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 264         0,
 265 };
 266
 267 /* MS Pull Control Enable:
 268  *     MS CD       ==> pull up
 269  *     others      ==> pull down
 270  */
 271 static const u32 rts5227_ms_pull_ctl_enable_tbl[] = {
 272         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 273         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 274         0,
 275 };
 276
 277 /* MS Pull Control Disable:
 278  *     MS CD       ==> pull up
 279  *     others      ==> pull down
 280  */
 281 static const u32 rts5227_ms_pull_ctl_disable_tbl[] = {
 282         RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 283         RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 284         0,
 285 };
 286
 287 void rts5227_init_params(struct rtsx_pcr *pcr)
 288 {
 289         pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
 290         pcr->num_slots = 2;
 291         pcr->ops = &rts5227_pcr_ops;
 292
 293         pcr->flags = 0;
 294         pcr->card_drive_sel = RTSX_CARD_DRIVE_DEFAULT;
 295         pcr->sd30_drive_sel_1v8 = CFG_DRIVER_TYPE_B;
 296         pcr->sd30_drive_sel_3v3 = CFG_DRIVER_TYPE_B;
 297         pcr->aspm_en = ASPM_L1_EN;
 298         pcr->tx_initial_phase = SET_CLOCK_PHASE(27, 27, 15);
 299         pcr->rx_initial_phase = SET_CLOCK_PHASE(30, 7, 7);
 300
 301         pcr->sd_pull_ctl_enable_tbl = rts5227_sd_pull_ctl_enable_tbl;
 302         pcr->sd_pull_ctl_disable_tbl = rts5227_sd_pull_ctl_disable_tbl;
 303         pcr->ms_pull_ctl_enable_tbl = rts5227_ms_pull_ctl_enable_tbl;
 304         pcr->ms_pull_ctl_disable_tbl = rts5227_ms_pull_ctl_disable_tbl;
 305 }