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From:   <rui_feng@realsil.com.cn>
To:     <arnd@arndb.de>, <gregkh@linuxfoundation.org>,
        <ulf.hansson@linaro.org>
CC:     <linux-kernel@vger.kernel.org>, <linux-mmc@vger.kernel.org>,
        Rui Feng <rui_feng@realsil.com.cn>
Subject: [PATCH v2 2/3] misc: rtsx: Add SD Express mode support for RTS5261
Date:   Thu, 22 Oct 2020 16:03:33 +0800
Message-ID: <1603353813-3334-1-git-send-email-rui_feng@realsil.com.cn>
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From: Rui Feng <rui_feng@realsil.com.cn>

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>
---
v2:remove duplicate define
---
 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 471961487ff8..536c90d4fd76 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 ebfdd236a553..8d80f0d5d5d6 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 37ccc67f4914..6e5c16b4b7d1 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 745f5e73f99a..b47959f48ccd 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
-- 
2.17.1