[PATCH] mmc: rtsx: Add SD Express mode support for RTS5261

From: rui_feng
Date: Sat Apr 25 2020 - 21:26:26 EST

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From: Rui Feng <rui_feng@xxxxxxxxxxxxxx>

RTS5261 support legacy SD mode and SD Express mode.
In SD7.x, SD association introduce SD Express as a new mode.
SD Express mode is distinguished by CMD8.
Therefore, CMD8 has new bit for SD Express.
SD Express is based on PCIe/NVMe.
RTS5261 uses CMD8 to switch to SD Express mode.

Signed-off-by: Rui Feng <rui_feng@xxxxxxxxxxxxxx>
---
drivers/misc/cardreader/Kconfig | 8 ++++++
drivers/misc/cardreader/Makefile | 3 +++
drivers/misc/cardreader/rts5261.c | 7 +++++
drivers/misc/cardreader/rtsx_pcr.c | 7 +++++
drivers/mmc/core/sd_ops.c | 9 ++++++-
drivers/mmc/host/rtsx_pci_sdmmc.c | 43 ++++++++++++++++++++++++++++++
include/linux/mmc/host.h | 1 +
include/linux/rtsx_pci.h | 15 +++++++++++
8 files changed, 92 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/cardreader/Kconfig b/drivers/misc/cardreader/Kconfig
index 022322dfb36e..1ce6bf1d121c 100644
--- a/drivers/misc/cardreader/Kconfig
+++ b/drivers/misc/cardreader/Kconfig
@@ -21,6 +21,14 @@ config MISC_RTSX_PCI
such as Memory Stick, Memory Stick Pro, Secure Digital and
MultiMediaCard.

+config MISC_RTSX_PCI_SD_EXPRESS
+ bool "Realtek PCI-E card reader support sd express card"
+ depends on MISC_RTSX_PCI
+ default y
+ help
+ RTS5261 support SD Express card.
+ Say Y here if you want to enable PCIe/NVMe mode.
+
config MISC_RTSX_USB
tristate "Realtek USB card reader"
depends on USB
diff --git a/drivers/misc/cardreader/Makefile b/drivers/misc/cardreader/Makefile
index 1f56267ed2f4..589011999f78 100644
--- a/drivers/misc/cardreader/Makefile
+++ b/drivers/misc/cardreader/Makefile
@@ -2,4 +2,7 @@
obj-$(CONFIG_MISC_ALCOR_PCI) += alcor_pci.o
obj-$(CONFIG_MISC_RTSX_PCI) += rtsx_pci.o
rtsx_pci-objs := rtsx_pcr.o rts5209.o rts5229.o rtl8411.o rts5227.o rts5249.o rts5260.o rts5261.o
+
+ccflags-$(CONFIG_MISC_RTSX_PCI_SD_EXPRESS) += -DMISC_RTSX_PCI_SD_EXPRESS
+
obj-$(CONFIG_MISC_RTSX_USB) += rtsx_usb.o
diff --git a/drivers/misc/cardreader/rts5261.c b/drivers/misc/cardreader/rts5261.c
index 547db5ffd3f6..68cb0562c278 100644
--- a/drivers/misc/cardreader/rts5261.c
+++ b/drivers/misc/cardreader/rts5261.c
@@ -759,8 +759,14 @@ 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;
+#ifdef MISC_RTSX_PCI_SD_EXPRESS
+ rtsx_pci_read_register(pcr, RTS5261_FW_STATUS, &val);
+ if (!(val & RTS5261_EXPRESS_LINK_FAIL_MASK))
+ pcr->extra_caps |= EXTRA_CAPS_SD_EXPRESS;
+#endif
pcr->num_slots = 1;
pcr->ops = &rts5261_pcr_ops;

@@ -791,6 +797,7 @@ void rts5261_init_params(struct rtsx_pcr *pcr)
option->ltr_l1off_snooze_sspwrgate = 0x78;
option->dev_aspm_mode = DEV_ASPM_DYNAMIC;

+ hw_param->interrupt_en |= DELINK_INT_EN;
option->ocp_en = 1;
hw_param->interrupt_en |= SD_OC_INT_EN;
hw_param->ocp_glitch = SD_OCP_GLITCH_800U;
diff --git a/drivers/misc/cardreader/rtsx_pcr.c b/drivers/misc/cardreader/rtsx_pcr.c
index 06038b325b02..2127c7b6b2e1 100644
--- a/drivers/misc/cardreader/rtsx_pcr.c
+++ b/drivers/misc/cardreader/rtsx_pcr.c
@@ -1026,6 +1026,13 @@ static irqreturn_t rtsx_pci_isr(int irq, void *dev_id)
} else {
pcr->card_removed |= SD_EXIST;
pcr->card_inserted &= ~SD_EXIST;
+#ifdef MISC_RTSX_PCI_SD_EXPRESS
+ 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;
+ }
+#endif
}
pcr->dma_error_count = 0;
}
diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
index 22bf528294b9..7c70d267644b 100644
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -171,7 +171,14 @@ int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
* SD 1.0 cards.
*/
cmd.opcode = SD_SEND_IF_COND;
- cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
+ /*
+ * Host asks card's PCIe availability
+ * if PCIe interface is supported by host.
+ */
+ if ((ocr & 0xFF8000) && (host->caps2 & MMC_CAP2_SD_EXPRESS))
+ cmd.arg = 0x31 << 8 | test_pattern;
+ else
+ cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;

err = mmc_wait_for_cmd(host, &cmd, 0);
diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c
index bd50935dc37d..87ad75b253eb 100644
--- a/drivers/mmc/host/rtsx_pci_sdmmc.c
+++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
@@ -219,6 +219,7 @@ static void sd_send_cmd_get_rsp(struct realtek_pci_sdmmc *host,
int rsp_type;
int stat_idx;
bool clock_toggled = false;
+ u32 relink_time, val;

dev_dbg(sdmmc_dev(host), "%s: SD/MMC CMD %d, arg = 0x%08x\n",
__func__, cmd_idx, arg);
@@ -322,6 +323,44 @@ static void sd_send_cmd_get_rsp(struct realtek_pci_sdmmc *host,
if (err && clock_toggled)
rtsx_pci_write_register(pcr, SD_BUS_STAT,
SD_CLK_TOGGLE_EN | SD_CLK_FORCE_STOP, 0);
+
+ /*
+ * If card has PCIe availability and WP if off,
+ * reader switch to PCIe mode.
+ */
+ val = rtsx_pci_readl(pcr, RTSX_BIPR);
+ if (cmd->opcode == 8 && ((cmd->resp[0] >> 8) & 0x10)
+ && !(val & SD_WRITE_PROTECT)) {
+ /* Set relink_time for changing to PCIe card */
+ relink_time = 0x8FFF;
+
+ rtsx_pci_write_register(pcr, 0xFF01, 0xFF, relink_time);
+ rtsx_pci_write_register(pcr, 0xFF02, 0xFF, relink_time >> 8);
+ rtsx_pci_write_register(pcr, 0xFF03, 0x01, relink_time >> 16);
+
+ rtsx_pci_write_register(pcr, PETXCFG, 0x80, 0x80);
+ rtsx_pci_write_register(pcr, LDO_VCC_CFG0,
+ RTS5261_LDO1_OCP_THD_MASK,
+ pcr->option.sd_800mA_ocp_thd);
+
+ if (pcr->ops->disable_auto_blink)
+ pcr->ops->disable_auto_blink(pcr);
+
+ /* For PCIe/NVMe mode can't enter delink issue */
+ pcr->hw_param.interrupt_en &= ~(SD_INT_EN);
+ rtsx_pci_writel(pcr, RTSX_BIER, pcr->hw_param.interrupt_en);
+
+ rtsx_pci_write_register(pcr, RTS5260_AUTOLOAD_CFG4,
+ RTS5261_AUX_CLK_16M_EN, RTS5261_AUX_CLK_16M_EN);
+ rtsx_pci_write_register(pcr, RTS5261_FW_CFG0,
+ RTS5261_FW_ENTER_EXPRESS, RTS5261_FW_ENTER_EXPRESS);
+ rtsx_pci_write_register(pcr, RTS5261_FW_CFG1,
+ RTS5261_MCU_BUS_SEL_MASK | RTS5261_MCU_CLOCK_SEL_MASK
+ | RTS5261_MCU_CLOCK_GATING | RTS5261_DRIVER_ENABLE_FW,
+ RTS5261_MCU_CLOCK_SEL_16M | RTS5261_MCU_CLOCK_GATING
+ | RTS5261_DRIVER_ENABLE_FW);
+ cmd->error = -EPERM;
+ }
}

static int sd_read_data(struct realtek_pci_sdmmc *host, struct mmc_command *cmd,
@@ -1123,6 +1162,8 @@ static int sdmmc_get_cd(struct mmc_host *mmc)
dev_dbg(sdmmc_dev(host), "%s: RTSX_BIPR = 0x%08x\n", __func__, val);
if (val & SD_EXIST)
cd = 1;
+ if (pcr->extra_caps & EXTRA_CAPS_SD_EXPRESS)
+ mmc->caps2 |= MMC_CAP2_SD_EXPRESS;

mutex_unlock(&pcr->pcr_mutex);

@@ -1333,6 +1374,8 @@ static void init_extra_caps(struct realtek_pci_sdmmc *host)
mmc->caps |= MMC_CAP_1_8V_DDR;
if (pcr->extra_caps & EXTRA_CAPS_MMC_8BIT)
mmc->caps |= MMC_CAP_8_BIT_DATA;
+ if (pcr->extra_caps & EXTRA_CAPS_SD_EXPRESS)
+ mmc->caps2 |= MMC_CAP2_SD_EXPRESS;
}

static void realtek_init_host(struct realtek_pci_sdmmc *host)
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index ba703384bea0..ac1e3da4ad4f 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -369,6 +369,7 @@ struct mmc_host {
#define MMC_CAP2_CQE_DCMD (1 << 24) /* CQE can issue a direct command */
#define MMC_CAP2_AVOID_3_3V (1 << 25) /* Host must negotiate down from 3.3V */
#define MMC_CAP2_MERGE_CAPABLE (1 << 26) /* Host can merge a segment over the segment size */
+#define MMC_CAP2_SD_EXPRESS (1 << 27) /* Host support sd express card */

int fixed_drv_type; /* fixed driver type for non-removable media */

diff --git a/include/linux/rtsx_pci.h b/include/linux/rtsx_pci.h
index 65b8142a7fed..2783dc5202ea 100644
--- a/include/linux/rtsx_pci.h
+++ b/include/linux/rtsx_pci.h
@@ -667,6 +667,16 @@
#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_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)
+
/* Memory mapping */
#define SRAM_BASE 0xE600
#define RBUF_BASE 0xF400
@@ -704,6 +714,8 @@
/*RTS5260*/
#define RTS5260_DVCC_TUNE_MASK 0x70
#define RTS5260_DVCC_33 0x70
+/*RTS5261*/
+#define RTS5261_LDO1_OCP_THD_MASK (0x07<<5)

#define LDO_VCC_CFG1 0xFF73
#define LDO_VCC_REF_TUNE_MASK 0x30
@@ -745,6 +757,8 @@

#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
@@ -1217,6 +1231,7 @@ struct rtsx_pcr {
#define EXTRA_CAPS_MMC_HSDDR (1 << 3)
#define EXTRA_CAPS_MMC_HS200 (1 << 4)
#define EXTRA_CAPS_MMC_8BIT (1 << 5)
+#define EXTRA_CAPS_SD_EXPRESS (1 << 6)
u32 extra_caps;

#define IC_VER_A 0
--
2.17.1

Next message: Dmitry Osipenko: "Re: [RFC PATCH v10 6/9] media: tegra: Add Tegra210 Video input driver"
Previous message: kbuild test robot: "[tip:x86/mm] BUILD SUCCESS 325518e9b743686f471e7a4ef617b57c91386795"
Next in thread: Christoph Hellwig: "Re: [PATCH] mmc: rtsx: Add SD Express mode support for RTS5261"
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