linux/drivers/mfd/rts5209.c
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   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
  28static 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
  36static 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        dev_dbg(&(pcr->pci->dev), "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        dev_dbg(&(pcr->pci->dev), "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
  61static void rts5209_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
  62{
  63        rtsx_pci_write_register(pcr, FPDCTL, 0x07, 0x07);
  64}
  65
  66static 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
  85static int rts5209_optimize_phy(struct rtsx_pcr *pcr)
  86{
  87        return rtsx_pci_write_phy_register(pcr, 0x00, 0xB966);
  88}
  89
  90static int rts5209_turn_on_led(struct rtsx_pcr *pcr)
  91{
  92        return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x00);
  93}
  94
  95static int rts5209_turn_off_led(struct rtsx_pcr *pcr)
  96{
  97        return rtsx_pci_write_register(pcr, CARD_GPIO, 0x01, 0x01);
  98}
  99
 100static int rts5209_enable_auto_blink(struct rtsx_pcr *pcr)
 101{
 102        return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0xFF, 0x0D);
 103}
 104
 105static int rts5209_disable_auto_blink(struct rtsx_pcr *pcr)
 106{
 107        return rtsx_pci_write_register(pcr, CARD_AUTO_BLINK, 0x08, 0x00);
 108}
 109
 110static 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        err = rtsx_pci_send_cmd(pcr, 100);
 142        if (err < 0)
 143                return err;
 144
 145        return 0;
 146}
 147
 148static int rts5209_card_power_off(struct rtsx_pcr *pcr, int card)
 149{
 150        u8 pwr_mask, pwr_off;
 151
 152        pwr_mask = SD_POWER_MASK;
 153        pwr_off = SD_POWER_OFF;
 154
 155        if ((pcr->flags & PCR_MS_PMOS) && (card == RTSX_MS_CARD)) {
 156                pwr_mask = MS_POWER_MASK;
 157                pwr_off = MS_POWER_OFF;
 158        }
 159
 160        rtsx_pci_init_cmd(pcr);
 161        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
 162                        pwr_mask | PMOS_STRG_MASK, pwr_off | PMOS_STRG_400mA);
 163        rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 164                        LDO3318_PWR_MASK, 0x06);
 165        return rtsx_pci_send_cmd(pcr, 100);
 166}
 167
 168static int rts5209_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
 169{
 170        int err;
 171
 172        if (voltage == OUTPUT_3V3) {
 173                err = rtsx_pci_write_register(pcr,
 174                                SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_3v3);
 175                if (err < 0)
 176                        return err;
 177                err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
 178                if (err < 0)
 179                        return err;
 180        } else if (voltage == OUTPUT_1V8) {
 181                err = rtsx_pci_write_register(pcr,
 182                                SD30_DRIVE_SEL, 0x07, pcr->sd30_drive_sel_1v8);
 183                if (err < 0)
 184                        return err;
 185                err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C40 | 0x24);
 186                if (err < 0)
 187                        return err;
 188        } else {
 189                return -EINVAL;
 190        }
 191
 192        return 0;
 193}
 194
 195static const struct pcr_ops rts5209_pcr_ops = {
 196        .fetch_vendor_settings = rts5209_fetch_vendor_settings,
 197        .extra_init_hw = rts5209_extra_init_hw,
 198        .optimize_phy = rts5209_optimize_phy,
 199        .turn_on_led = rts5209_turn_on_led,
 200        .turn_off_led = rts5209_turn_off_led,
 201        .enable_auto_blink = rts5209_enable_auto_blink,
 202        .disable_auto_blink = rts5209_disable_auto_blink,
 203        .card_power_on = rts5209_card_power_on,
 204        .card_power_off = rts5209_card_power_off,
 205        .switch_output_voltage = rts5209_switch_output_voltage,
 206        .cd_deglitch = NULL,
 207        .conv_clk_and_div_n = NULL,
 208        .force_power_down = rts5209_force_power_down,
 209};
 210
 211/* SD Pull Control Enable:
 212 *     SD_DAT[3:0] ==> pull up
 213 *     SD_CD       ==> pull up
 214 *     SD_WP       ==> pull up
 215 *     SD_CMD      ==> pull up
 216 *     SD_CLK      ==> pull down
 217 */
 218static const u32 rts5209_sd_pull_ctl_enable_tbl[] = {
 219        RTSX_REG_PAIR(CARD_PULL_CTL1, 0xAA),
 220        RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
 221        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
 222        0,
 223};
 224
 225/* SD Pull Control Disable:
 226 *     SD_DAT[3:0] ==> pull down
 227 *     SD_CD       ==> pull up
 228 *     SD_WP       ==> pull down
 229 *     SD_CMD      ==> pull down
 230 *     SD_CLK      ==> pull down
 231 */
 232static const u32 rts5209_sd_pull_ctl_disable_tbl[] = {
 233        RTSX_REG_PAIR(CARD_PULL_CTL1, 0x55),
 234        RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
 235        RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
 236        0,
 237};
 238
 239/* MS Pull Control Enable:
 240 *     MS CD       ==> pull up
 241 *     others      ==> pull down
 242 */
 243static const u32 rts5209_ms_pull_ctl_enable_tbl[] = {
 244        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 245        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 246        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 247        0,
 248};
 249
 250/* MS Pull Control Disable:
 251 *     MS CD       ==> pull up
 252 *     others      ==> pull down
 253 */
 254static const u32 rts5209_ms_pull_ctl_disable_tbl[] = {
 255        RTSX_REG_PAIR(CARD_PULL_CTL4, 0x55),
 256        RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
 257        RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
 258        0,
 259};
 260
 261void rts5209_init_params(struct rtsx_pcr *pcr)
 262{
 263        pcr->extra_caps = EXTRA_CAPS_SD_SDR50 |
 264                EXTRA_CAPS_SD_SDR104 | EXTRA_CAPS_MMC_8BIT;
 265        pcr->num_slots = 2;
 266        pcr->ops = &rts5209_pcr_ops;
 267
 268        pcr->flags = 0;
 269        pcr->card_drive_sel = RTS5209_CARD_DRIVE_DEFAULT;
 270        pcr->sd30_drive_sel_1v8 = DRIVER_TYPE_B;
 271        pcr->sd30_drive_sel_3v3 = DRIVER_TYPE_D;
 272        pcr->aspm_en = ASPM_L1_EN;
 273        pcr->tx_initial_phase = SET_CLOCK_PHASE(27, 27, 16);
 274        pcr->rx_initial_phase = SET_CLOCK_PHASE(24, 6, 5);
 275
 276        pcr->ic_version = rts5209_get_ic_version(pcr);
 277        pcr->sd_pull_ctl_enable_tbl = rts5209_sd_pull_ctl_enable_tbl;
 278        pcr->sd_pull_ctl_disable_tbl = rts5209_sd_pull_ctl_disable_tbl;
 279        pcr->ms_pull_ctl_enable_tbl = rts5209_ms_pull_ctl_enable_tbl;
 280        pcr->ms_pull_ctl_disable_tbl = rts5209_ms_pull_ctl_disable_tbl;
 281}
 282
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