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linux/drivers/misc/cardreader/rts5227.c
Ricky Wu 807221d3c5 misc: rtsx_pci: Add separate CD/WP pin polarity reversal support 
Previously, the Card Detect (CD) and Write Protect (WP) pins shared the
same reverse polarity setting in the configuration space. This meant both
signals were reversed together, without the ability to configure them
individually.

This patch introduces two new parameters:
sd_cd_reverse_en – enable reverse polarity for the CD pin.
sd_wp_reverse_en – enable reverse polarity for the WP pin.

With this change, the controller can now support:
1.Reversing both CD and WP pins together (original behavior).
2.Reversing CD and WP pins separately (newly added behavior), if
supported by the configuration space.

This provides greater flexibility when dealing with devices that have
independent polarity requirements for CD and WP pins.

Signed-off-by: Ricky Wu <ricky_wu@realtek.com>
Link: https://lore.kernel.org/r/20250812063521.2427696-1-ricky_wu@realtek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-08-19 12:37:10 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/* Driver for Realtek PCI-Express card reader
*
* Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
*
* Author:
* Wei WANG <wei_wang@realsil.com.cn>
* Roger Tseng <rogerable@realtek.com>
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/rtsx_pci.h>
#include "rtsx_pcr.h"
static u8 rts5227_get_ic_version(struct rtsx_pcr *pcr)
{
u8 val;
rtsx_pci_read_register(pcr, DUMMY_REG_RESET_0, &val);
return val & 0x0F;
}
static void rts5227_fill_driving(struct rtsx_pcr *pcr, u8 voltage)
{
u8 driving_3v3[4][3] = {
{0x13, 0x13, 0x13},
{0x96, 0x96, 0x96},
{0x7F, 0x7F, 0x7F},
{0x96, 0x96, 0x96},
};
u8 driving_1v8[4][3] = {
{0x99, 0x99, 0x99},
{0xAA, 0xAA, 0xAA},
{0xFE, 0xFE, 0xFE},
{0xB3, 0xB3, 0xB3},
};
u8 (*driving)[3], drive_sel;
if (voltage == OUTPUT_3V3) {
driving = driving_3v3;
drive_sel = pcr->sd30_drive_sel_3v3;
} else {
driving = driving_1v8;
drive_sel = pcr->sd30_drive_sel_1v8;
}
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_CLK_DRIVE_SEL,
0xFF, driving[drive_sel][0]);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_CMD_DRIVE_SEL,
0xFF, driving[drive_sel][1]);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, SD30_DAT_DRIVE_SEL,
0xFF, driving[drive_sel][2]);
}
static void rts5227_fetch_vendor_settings(struct rtsx_pcr *pcr)
{
struct pci_dev *pdev = pcr->pci;
u32 reg;
pci_read_config_dword(pdev, PCR_SETTING_REG1, &reg);
pcr_dbg(pcr, "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG1, reg);
if (!rtsx_vendor_setting_valid(reg))
return;
pcr->aspm_en = rtsx_reg_to_aspm(reg);
pcr->sd30_drive_sel_1v8 = rtsx_reg_to_sd30_drive_sel_1v8(reg);
pcr->card_drive_sel &= 0x3F;
pcr->card_drive_sel |= rtsx_reg_to_card_drive_sel(reg);
pci_read_config_dword(pdev, PCR_SETTING_REG2, &reg);
pcr_dbg(pcr, "Cfg 0x%x: 0x%x\n", PCR_SETTING_REG2, reg);
if (CHK_PCI_PID(pcr, 0x522A))
pcr->rtd3_en = rtsx_reg_to_rtd3(reg);
if (rtsx_check_mmc_support(reg))
pcr->extra_caps |= EXTRA_CAPS_NO_MMC;
pcr->sd30_drive_sel_3v3 = rtsx_reg_to_sd30_drive_sel_3v3(reg);
if (rtsx_reg_check_reverse_socket(reg))
pcr->flags |= PCR_REVERSE_SOCKET;
if (rtsx_reg_check_cd_reverse(reg))
pcr->option.sd_cd_reverse_en = 1;
if (rtsx_reg_check_wp_reverse(reg))
pcr->option.sd_wp_reverse_en = 1;
}
static void rts5227_init_from_cfg(struct rtsx_pcr *pcr)
{
struct rtsx_cr_option *option = &pcr->option;
if (CHK_PCI_PID(pcr, 0x522A)) {
if (rtsx_check_dev_flag(pcr, ASPM_L1_1_EN | ASPM_L1_2_EN
| PM_L1_1_EN | PM_L1_2_EN))
rtsx_pci_disable_oobs_polling(pcr);
else
rtsx_pci_enable_oobs_polling(pcr);
}
if (option->ltr_en) {
if (option->ltr_enabled)
rtsx_set_ltr_latency(pcr, option->ltr_active_latency);
}
}
static int rts5227_extra_init_hw(struct rtsx_pcr *pcr)
{
u16 cap;
struct rtsx_cr_option *option = &pcr->option;
rts5227_init_from_cfg(pcr);
rtsx_pci_init_cmd(pcr);
/* Configure GPIO as output */
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, GPIO_CTL, 0x02, 0x02);
/* Reset ASPM state to default value */
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, ASPM_FORCE_CTL, 0x3F, 0);
/* Switch LDO3318 source from DV33 to card_3v3 */
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x00);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LDO_PWR_SEL, 0x03, 0x01);
/* LED shine disabled, set initial shine cycle period */
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, OLT_LED_CTL, 0x0F, 0x02);
/* Configure LTR */
pcie_capability_read_word(pcr->pci, PCI_EXP_DEVCTL2, &cap);
if (cap & PCI_EXP_DEVCTL2_LTR_EN)
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, LTR_CTL, 0xFF, 0xA3);
/* Configure OBFF */
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, OBFF_CFG, 0x03, 0x03);
/* Configure driving */
rts5227_fill_driving(pcr, OUTPUT_3V3);
/* Configure force_clock_req */
if (pcr->flags & PCR_REVERSE_SOCKET)
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG, 0x30, 0x30);
else {
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG, 0x20, option->sd_cd_reverse_en << 5);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG, 0x10, option->sd_wp_reverse_en << 4);
}
if (CHK_PCI_PID(pcr, 0x522A))
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, RTS522A_AUTOLOAD_CFG1,
CD_RESUME_EN_MASK, CD_RESUME_EN_MASK);
if (pcr->rtd3_en) {
if (CHK_PCI_PID(pcr, 0x522A)) {
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, RTS522A_PM_CTRL3, 0x01, 0x01);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, RTS522A_PME_FORCE_CTL, 0x30, 0x30);
} else {
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PM_CTRL3, 0x01, 0x01);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PME_FORCE_CTL, 0xFF, 0x33);
}
} else {
if (CHK_PCI_PID(pcr, 0x522A)) {
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, RTS522A_PM_CTRL3, 0x01, 0x00);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, RTS522A_PME_FORCE_CTL, 0x30, 0x20);
} else {
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PME_FORCE_CTL, 0xFF, 0x30);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PM_CTRL3, 0x01, 0x00);
}
}
if (option->force_clkreq_0)
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG,
FORCE_CLKREQ_DELINK_MASK, FORCE_CLKREQ_LOW);
else
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PETXCFG,
FORCE_CLKREQ_DELINK_MASK, FORCE_CLKREQ_HIGH);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, pcr->reg_pm_ctrl3, 0x10, 0x00);
return rtsx_pci_send_cmd(pcr, 100);
}
static int rts5227_optimize_phy(struct rtsx_pcr *pcr)
{
int err;
err = rtsx_pci_write_register(pcr, PM_CTRL3, D3_DELINK_MODE_EN, 0x00);
if (err < 0)
return err;
/* Optimize RX sensitivity */
return rtsx_pci_write_phy_register(pcr, 0x00, 0xBA42);
}
static int rts5227_turn_on_led(struct rtsx_pcr *pcr)
{
return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x02);
}
static int rts5227_turn_off_led(struct rtsx_pcr *pcr)
{
return rtsx_pci_write_register(pcr, GPIO_CTL, 0x02, 0x00);
}
static int rts5227_enable_auto_blink(struct rtsx_pcr *pcr)
{
return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x08);
}
static int rts5227_disable_auto_blink(struct rtsx_pcr *pcr)
{
return rtsx_pci_write_register(pcr, OLT_LED_CTL, 0x08, 0x00);
}
static int rts5227_card_power_on(struct rtsx_pcr *pcr, int card)
{
int err;
if (pcr->option.ocp_en)
rtsx_pci_enable_ocp(pcr);
rtsx_pci_init_cmd(pcr);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
SD_POWER_MASK, SD_PARTIAL_POWER_ON);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
LDO3318_PWR_MASK, 0x02);
err = rtsx_pci_send_cmd(pcr, 100);
if (err < 0)
return err;
/* To avoid too large in-rush current */
msleep(20);
rtsx_pci_init_cmd(pcr);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_PWR_CTL,
SD_POWER_MASK, SD_POWER_ON);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
LDO3318_PWR_MASK, 0x06);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_OE,
SD_OUTPUT_EN, SD_OUTPUT_EN);
rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, CARD_OE,
MS_OUTPUT_EN, MS_OUTPUT_EN);
return rtsx_pci_send_cmd(pcr, 100);
}
static int rts5227_card_power_off(struct rtsx_pcr *pcr, int card)
{
if (pcr->option.ocp_en)
rtsx_pci_disable_ocp(pcr);
rtsx_pci_write_register(pcr, CARD_PWR_CTL, SD_POWER_MASK |
PMOS_STRG_MASK, SD_POWER_OFF | PMOS_STRG_400mA);
rtsx_pci_write_register(pcr, PWR_GATE_CTRL, LDO3318_PWR_MASK, 0X00);
return 0;
}
static int rts5227_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
{
int err;
if (voltage == OUTPUT_3V3) {
err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4FC0 | 0x24);
if (err < 0)
return err;
} else if (voltage == OUTPUT_1V8) {
err = rtsx_pci_write_phy_register(pcr, 0x11, 0x3C02);
if (err < 0)
return err;
err = rtsx_pci_write_phy_register(pcr, 0x08, 0x4C80 | 0x24);
if (err < 0)
return err;
} else {
return -EINVAL;
}
/* set pad drive */
rtsx_pci_init_cmd(pcr);
rts5227_fill_driving(pcr, voltage);
return rtsx_pci_send_cmd(pcr, 100);
}
static const struct pcr_ops rts5227_pcr_ops = {
.fetch_vendor_settings = rts5227_fetch_vendor_settings,
.extra_init_hw = rts5227_extra_init_hw,
.optimize_phy = rts5227_optimize_phy,
.turn_on_led = rts5227_turn_on_led,
.turn_off_led = rts5227_turn_off_led,
.enable_auto_blink = rts5227_enable_auto_blink,
.disable_auto_blink = rts5227_disable_auto_blink,
.card_power_on = rts5227_card_power_on,
.card_power_off = rts5227_card_power_off,
.switch_output_voltage = rts5227_switch_output_voltage,
.cd_deglitch = NULL,
.conv_clk_and_div_n = NULL,
};
/* SD Pull Control Enable:
* SD_DAT[3:0] ==> pull up
* SD_CD ==> pull up
* SD_WP ==> pull up
* SD_CMD ==> pull up
* SD_CLK ==> pull down
*/
static const u32 rts5227_sd_pull_ctl_enable_tbl[] = {
RTSX_REG_PAIR(CARD_PULL_CTL2, 0xAA),
RTSX_REG_PAIR(CARD_PULL_CTL3, 0xE9),
0,
};
/* SD Pull Control Disable:
* SD_DAT[3:0] ==> pull down
* SD_CD ==> pull up
* SD_WP ==> pull down
* SD_CMD ==> pull down
* SD_CLK ==> pull down
*/
static const u32 rts5227_sd_pull_ctl_disable_tbl[] = {
RTSX_REG_PAIR(CARD_PULL_CTL2, 0x55),
RTSX_REG_PAIR(CARD_PULL_CTL3, 0xD5),
0,
};
/* MS Pull Control Enable:
* MS CD ==> pull up
* others ==> pull down
*/
static const u32 rts5227_ms_pull_ctl_enable_tbl[] = {
RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
0,
};
/* MS Pull Control Disable:
* MS CD ==> pull up
* others ==> pull down
*/
static const u32 rts5227_ms_pull_ctl_disable_tbl[] = {
RTSX_REG_PAIR(CARD_PULL_CTL5, 0x55),
RTSX_REG_PAIR(CARD_PULL_CTL6, 0x15),
0,
};
void rts5227_init_params(struct rtsx_pcr *pcr)
{
pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
pcr->num_slots = 2;
pcr->ops = &rts5227_pcr_ops;
pcr->flags = 0;
pcr->card_drive_sel = RTSX_CARD_DRIVE_DEFAULT;
pcr->sd30_drive_sel_1v8 = CFG_DRIVER_TYPE_B;
pcr->sd30_drive_sel_3v3 = CFG_DRIVER_TYPE_B;
pcr->aspm_en = ASPM_L1_EN;
pcr->aspm_mode = ASPM_MODE_CFG;
pcr->tx_initial_phase = SET_CLOCK_PHASE(27, 27, 15);
pcr->rx_initial_phase = SET_CLOCK_PHASE(30, 7, 7);
pcr->ic_version = rts5227_get_ic_version(pcr);
pcr->sd_pull_ctl_enable_tbl = rts5227_sd_pull_ctl_enable_tbl;
pcr->sd_pull_ctl_disable_tbl = rts5227_sd_pull_ctl_disable_tbl;
pcr->ms_pull_ctl_enable_tbl = rts5227_ms_pull_ctl_enable_tbl;
pcr->ms_pull_ctl_disable_tbl = rts5227_ms_pull_ctl_disable_tbl;
pcr->reg_pm_ctrl3 = PM_CTRL3;
pcr->option.sd_cd_reverse_en = 0;
pcr->option.sd_wp_reverse_en = 0;
}
static int rts522a_optimize_phy(struct rtsx_pcr *pcr)
{
int err;
err = rtsx_pci_write_register(pcr, RTS522A_PM_CTRL3, D3_DELINK_MODE_EN,
0x00);
if (err < 0)
return err;
if (is_version(pcr, 0x522A, IC_VER_A)) {
err = rtsx_pci_write_phy_register(pcr, PHY_RCR2,
PHY_RCR2_INIT_27S);
if (err)
return err;
rtsx_pci_write_phy_register(pcr, PHY_RCR1, PHY_RCR1_INIT_27S);
rtsx_pci_write_phy_register(pcr, PHY_FLD0, PHY_FLD0_INIT_27S);
rtsx_pci_write_phy_register(pcr, PHY_FLD3, PHY_FLD3_INIT_27S);
rtsx_pci_write_phy_register(pcr, PHY_FLD4, PHY_FLD4_INIT_27S);
}
return 0;
}
static int rts522a_extra_init_hw(struct rtsx_pcr *pcr)
{
rts5227_extra_init_hw(pcr);
/* Power down OCP for power consumption */
if (!pcr->card_exist)
rtsx_pci_write_register(pcr, FPDCTL, OC_POWER_DOWN,
OC_POWER_DOWN);
rtsx_pci_write_register(pcr, FUNC_FORCE_CTL, FUNC_FORCE_UPME_XMT_DBG,
FUNC_FORCE_UPME_XMT_DBG);
rtsx_pci_write_register(pcr, PCLK_CTL, 0x04, 0x04);
rtsx_pci_write_register(pcr, PM_EVENT_DEBUG, PME_DEBUG_0, PME_DEBUG_0);
rtsx_pci_write_register(pcr, PM_CLK_FORCE_CTL, 0xFF, 0x11);
return 0;
}
static int rts522a_switch_output_voltage(struct rtsx_pcr *pcr, u8 voltage)
{
int err;
if (voltage == OUTPUT_3V3) {
err = rtsx_pci_write_phy_register(pcr, 0x08, 0x57E4);
if (err < 0)
return err;
} else if (voltage == OUTPUT_1V8) {
err = rtsx_pci_write_phy_register(pcr, 0x11, 0x3C02);
if (err < 0)
return err;
err = rtsx_pci_write_phy_register(pcr, 0x08, 0x54A4);
if (err < 0)
return err;
} else {
return -EINVAL;
}
/* set pad drive */
rtsx_pci_init_cmd(pcr);
rts5227_fill_driving(pcr, voltage);
return rtsx_pci_send_cmd(pcr, 100);
}
static void rts522a_force_power_down(struct rtsx_pcr *pcr, u8 pm_state, bool runtime)
{
/* Set relink_time to 0 */
rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 1, MASK_8_BIT_DEF, 0);
rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 2, MASK_8_BIT_DEF, 0);
rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 3,
RELINK_TIME_MASK, 0);
rtsx_pci_write_register(pcr, RTS522A_PM_CTRL3,
D3_DELINK_MODE_EN, D3_DELINK_MODE_EN);
if (!runtime) {
rtsx_pci_write_register(pcr, RTS522A_AUTOLOAD_CFG1,
CD_RESUME_EN_MASK, 0);
rtsx_pci_write_register(pcr, RTS522A_PM_CTRL3, 0x01, 0x00);
rtsx_pci_write_register(pcr, RTS522A_PME_FORCE_CTL, 0x30, 0x20);
}
rtsx_pci_write_register(pcr, FPDCTL, ALL_POWER_DOWN, ALL_POWER_DOWN);
}
static void rts522a_set_l1off_cfg_sub_d0(struct rtsx_pcr *pcr, int active)
{
struct rtsx_cr_option *option = &pcr->option;
int aspm_L1_1, aspm_L1_2;
u8 val = 0;
aspm_L1_1 = rtsx_check_dev_flag(pcr, ASPM_L1_1_EN);
aspm_L1_2 = rtsx_check_dev_flag(pcr, ASPM_L1_2_EN);
if (active) {
/* run, latency: 60us */
if (aspm_L1_1)
val = option->ltr_l1off_snooze_sspwrgate;
} else {
/* l1off, latency: 300us */
if (aspm_L1_2)
val = option->ltr_l1off_sspwrgate;
}
rtsx_set_l1off_sub(pcr, val);
}
/* rts522a operations mainly derived from rts5227, except phy/hw init setting.
*/
static const struct pcr_ops rts522a_pcr_ops = {
.fetch_vendor_settings = rts5227_fetch_vendor_settings,
.extra_init_hw = rts522a_extra_init_hw,
.optimize_phy = rts522a_optimize_phy,
.turn_on_led = rts5227_turn_on_led,
.turn_off_led = rts5227_turn_off_led,
.enable_auto_blink = rts5227_enable_auto_blink,
.disable_auto_blink = rts5227_disable_auto_blink,
.card_power_on = rts5227_card_power_on,
.card_power_off = rts5227_card_power_off,
.switch_output_voltage = rts522a_switch_output_voltage,
.force_power_down = rts522a_force_power_down,
.cd_deglitch = NULL,
.conv_clk_and_div_n = NULL,
.set_l1off_cfg_sub_d0 = rts522a_set_l1off_cfg_sub_d0,
};
void rts522a_init_params(struct rtsx_pcr *pcr)
{
struct rtsx_cr_option *option = &pcr->option;
rts5227_init_params(pcr);
pcr->ops = &rts522a_pcr_ops;
pcr->aspm_mode = ASPM_MODE_REG;
pcr->tx_initial_phase = SET_CLOCK_PHASE(20, 20, 11);
pcr->reg_pm_ctrl3 = RTS522A_PM_CTRL3;
option->dev_flags = LTR_L1SS_PWR_GATE_EN;
option->ltr_en = true;
/* init latency of active, idle, L1OFF to 60us, 300us, 3ms */
option->ltr_active_latency = LTR_ACTIVE_LATENCY_DEF;
option->ltr_idle_latency = LTR_IDLE_LATENCY_DEF;
option->ltr_l1off_latency = LTR_L1OFF_LATENCY_DEF;
option->l1_snooze_delay = L1_SNOOZE_DELAY_DEF;
option->ltr_l1off_sspwrgate = 0x7F;
option->ltr_l1off_snooze_sspwrgate = 0x78;
pcr->option.ocp_en = 1;
if (pcr->option.ocp_en)
pcr->hw_param.interrupt_en |= SD_OC_INT_EN;
pcr->hw_param.ocp_glitch = SD_OCP_GLITCH_10M;
pcr->option.sd_800mA_ocp_thd = RTS522A_OCP_THD_800;
}
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