[PATCH 5.10 125/147] misc: rtsx: Add SD Express mode support for RTS5261

Sasha Levin
2026-02-28T18:19:16Z

From: Rui Feng <rui_feng@realsil.com.cn>

[ Upstream commit 5afe802132f242f5520d2acac09ea05d31e3c7cf ]

RTS5261 support SD mode and PCIe/NVMe mode. The workflow is as follows.
1.RTS5261 work in SD mode and set MMC_CAPS2_SD_EXP flag.
2.If card is plugged in, Host send CMD8 to ask card's PCIe availability.
3.If the card has PCIe availability and WP is not set, init_sd_express() will be invoked,
RTS5261 switch to PCIe/NVMe mode.
4.Mmc driver handover it to NVMe driver.
5.If card is unplugged, RTS5261 will switch to SD mode.

Signed-off-by: Rui Feng <rui_feng@realsil.com.cn>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/1603936668-3363-1-git-send-email-rui_feng@realsil.com.cn
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Stable-dep-of: aced969e9bf3 ("mmc: rtsx_pci_sdmmc: increase power-on settling delay to 5ms")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/misc/cardreader/rts5261.c | 4 ++++
drivers/misc/cardreader/rts5261.h | 23 -----------------------
drivers/misc/cardreader/rtsx_pcr.c | 5 +++++
include/linux/rtsx_pci.h | 23 +++++++++++++++++++++++
4 files changed, 32 insertions(+), 23 deletions(-)

diff --git a/drivers/misc/cardreader/rts5261.c b/drivers/misc/cardreader/rts5261.c
index 471961487ff8f..536c90d4fd763 100644
--- a/drivers/misc/cardreader/rts5261.c
+++ b/drivers/misc/cardreader/rts5261.c
@@ -738,8 +738,12 @@ void rts5261_init_params(struct rtsx_pcr *pcr)
{
struct rtsx_cr_option *option = &pcr->option;
struct rtsx_hw_param *hw_param = &pcr->hw_param;
+ u8 val;

pcr->extra_caps = EXTRA_CAPS_SD_SDR50 | EXTRA_CAPS_SD_SDR104;
+ rtsx_pci_read_register(pcr, RTS5261_FW_STATUS, &val);
+ if (!(val & RTS5261_EXPRESS_LINK_FAIL_MASK))
+ pcr->extra_caps |= EXTRA_CAPS_SD_EXPRESS;
pcr->num_slots = 1;
pcr->ops = &rts5261_pcr_ops;

diff --git a/drivers/misc/cardreader/rts5261.h b/drivers/misc/cardreader/rts5261.h
index ebfdd236a553e..8d80f0d5d5d63 100644
--- a/drivers/misc/cardreader/rts5261.h
+++ b/drivers/misc/cardreader/rts5261.h
@@ -65,23 +65,6 @@
#define RTS5261_FW_EXPRESS_TEST_MASK (0x01<<0)
#define RTS5261_FW_EA_MODE_MASK (0x01<<5)

-/* FW config register */
-#define RTS5261_FW_CFG0 0xFF54
-#define RTS5261_FW_ENTER_EXPRESS (0x01<<0)
-
-#define RTS5261_FW_CFG1 0xFF55
-#define RTS5261_SYS_CLK_SEL_MCU_CLK (0x01<<7)
-#define RTS5261_CRC_CLK_SEL_MCU_CLK (0x01<<6)
-#define RTS5261_FAKE_MCU_CLOCK_GATING (0x01<<5)
-/*MCU_bus_mode_sel: 0=real 8051 1=fake mcu*/
-#define RTS5261_MCU_BUS_SEL_MASK (0x01<<4)
-/*MCU_clock_sel:VerA 00=aux16M 01=aux400K 1x=REFCLK100M*/
-/*MCU_clock_sel:VerB 00=aux400K 01=aux16M 10=REFCLK100M*/
-#define RTS5261_MCU_CLOCK_SEL_MASK (0x03<<2)
-#define RTS5261_MCU_CLOCK_SEL_16M (0x01<<2)
-#define RTS5261_MCU_CLOCK_GATING (0x01<<1)
-#define RTS5261_DRIVER_ENABLE_FW (0x01<<0)
-
/* FW status register */
#define RTS5261_FW_STATUS 0xFF56
#define RTS5261_EXPRESS_LINK_FAIL_MASK (0x01<<7)
@@ -121,12 +104,6 @@
#define RTS5261_DV3318_19 (0x04<<4)
#define RTS5261_DV3318_33 (0x07<<4)

-#define RTS5261_LDO1_CFG0 0xFF72
-#define RTS5261_LDO1_OCP_THD_MASK (0x07<<5)
-#define RTS5261_LDO1_OCP_EN (0x01<<4)
-#define RTS5261_LDO1_OCP_LMT_THD_MASK (0x03<<2)
-#define RTS5261_LDO1_OCP_LMT_EN (0x01<<1)
-
/* CRD6603-433 190319 request changed */
#define RTS5261_LDO1_OCP_THD_740 (0x00<<5)
#define RTS5261_LDO1_OCP_THD_800 (0x01<<5)
diff --git a/drivers/misc/cardreader/rtsx_pcr.c b/drivers/misc/cardreader/rtsx_pcr.c
index 358b000b3a552..4c57ecb2be404 100644
--- a/drivers/misc/cardreader/rtsx_pcr.c
+++ b/drivers/misc/cardreader/rtsx_pcr.c
@@ -990,6 +990,11 @@ static irqreturn_t rtsx_pci_isr(int irq, void *dev_id)
} else {
pcr->card_removed |= SD_EXIST;
pcr->card_inserted &= ~SD_EXIST;
+ if (PCI_PID(pcr) == PID_5261) {
+ rtsx_pci_write_register(pcr, RTS5261_FW_STATUS,
+ RTS5261_EXPRESS_LINK_FAIL_MASK, 0);
+ pcr->extra_caps |= EXTRA_CAPS_SD_EXPRESS;
+ }
}
pcr->dma_error_count = 0;
}
diff --git a/include/linux/rtsx_pci.h b/include/linux/rtsx_pci.h
index 745f5e73f99ac..b47959f48ccd4 100644
--- a/include/linux/rtsx_pci.h
+++ b/include/linux/rtsx_pci.h
@@ -658,6 +658,19 @@
#define PM_WAKE_EN 0x01
#define PM_CTRL4 0xFF47

+#define RTS5261_FW_CFG0 0xFF54
+#define RTS5261_FW_ENTER_EXPRESS (0x01 << 0)
+
+#define RTS5261_FW_CFG1 0xFF55
+#define RTS5261_SYS_CLK_SEL_MCU_CLK (0x01 << 7)
+#define RTS5261_CRC_CLK_SEL_MCU_CLK (0x01 << 6)
+#define RTS5261_FAKE_MCU_CLOCK_GATING (0x01 << 5)
+#define RTS5261_MCU_BUS_SEL_MASK (0x01 << 4)
+#define RTS5261_MCU_CLOCK_SEL_MASK (0x03 << 2)
+#define RTS5261_MCU_CLOCK_SEL_16M (0x01 << 2)
+#define RTS5261_MCU_CLOCK_GATING (0x01 << 1)
+#define RTS5261_DRIVER_ENABLE_FW (0x01 << 0)
+
#define REG_CFG_OOBS_OFF_TIMER 0xFEA6
#define REG_CFG_OOBS_ON_TIMER 0xFEA7
#define REG_CFG_VCM_ON_TIMER 0xFEA8
@@ -701,6 +714,13 @@
#define RTS5260_DVCC_TUNE_MASK 0x70
#define RTS5260_DVCC_33 0x70

+/*RTS5261*/
+#define RTS5261_LDO1_CFG0 0xFF72
+#define RTS5261_LDO1_OCP_THD_MASK (0x07 << 5)
+#define RTS5261_LDO1_OCP_EN (0x01 << 4)
+#define RTS5261_LDO1_OCP_LMT_THD_MASK (0x03 << 2)
+#define RTS5261_LDO1_OCP_LMT_EN (0x01 << 1)
+
#define LDO_VCC_CFG1 0xFF73
#define LDO_VCC_REF_TUNE_MASK 0x30
#define LDO_VCC_REF_1V2 0x20
@@ -741,6 +761,8 @@

#define RTS5260_AUTOLOAD_CFG4 0xFF7F
#define RTS5260_MIMO_DISABLE 0x8A
+/*RTS5261*/
+#define RTS5261_AUX_CLK_16M_EN (1 << 5)

#define RTS5260_REG_GPIO_CTL0 0xFC1A
#define RTS5260_REG_GPIO_MASK 0x01
@@ -1191,6 +1213,7 @@ struct rtsx_pcr {
#define EXTRA_CAPS_MMC_HS200 (1 << 4)
#define EXTRA_CAPS_MMC_8BIT (1 << 5)
#define EXTRA_CAPS_NO_MMC (1 << 7)
+#define EXTRA_CAPS_SD_EXPRESS (1 << 8)
u32 extra_caps;

#define IC_VER_A 0
--
2.51.0