From 9ff43c7be9b417ed712de0f6a0918974f60beacf Mon Sep 17 00:00:00 2001 From: Rui Feng Date: Thu, 29 Oct 2020 09:58:23 +0800 Subject: mmc: rtsx_pci: Add SD Express mode support for RTS5261 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 Link: https://lore.kernel.org/r/1603936703-3403-1-git-send-email-rui_feng@realsil.com.cn Signed-off-by: Ulf Hansson --- drivers/mmc/host/rtsx_pci_sdmmc.c | 58 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c index eb395e144207..c584070b39fe 100644 --- a/drivers/mmc/host/rtsx_pci_sdmmc.c +++ b/drivers/mmc/host/rtsx_pci_sdmmc.c @@ -895,7 +895,9 @@ static int sd_set_bus_width(struct realtek_pci_sdmmc *host, static int sd_power_on(struct realtek_pci_sdmmc *host) { struct rtsx_pcr *pcr = host->pcr; + struct mmc_host *mmc = host->mmc; int err; + u32 val; if (host->power_state == SDMMC_POWER_ON) return 0; @@ -922,6 +924,21 @@ static int sd_power_on(struct realtek_pci_sdmmc *host) if (err < 0) return err; + if (PCI_PID(pcr) == PID_5261) { + if (pcr->extra_caps & EXTRA_CAPS_SD_EXPRESS) + mmc->caps2 |= MMC_CAP2_SD_EXP | MMC_CAP2_SD_EXP_1_2V; + /* + * HW read wp status when resuming from S3/S4, + * and then picks SD legacy interface if it's set + * in read-only mode. + */ + val = rtsx_pci_readl(pcr, RTSX_BIPR); + if (val & SD_WRITE_PROTECT) { + pcr->extra_caps &= ~EXTRA_CAPS_SD_EXPRESS; + mmc->caps2 &= ~(MMC_CAP2_SD_EXP | MMC_CAP2_SD_EXP_1_2V); + } + } + host->power_state = SDMMC_POWER_ON; return 0; } @@ -1308,6 +1325,44 @@ out: return err; } +static int sdmmc_init_sd_express(struct mmc_host *mmc, struct mmc_ios *ios) +{ + u32 relink_time; + struct realtek_pci_sdmmc *host = mmc_priv(mmc); + struct rtsx_pcr *pcr = host->pcr; + + /* 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); + host->eject = true; + return 0; +} + static const struct mmc_host_ops realtek_pci_sdmmc_ops = { .pre_req = sdmmc_pre_req, .post_req = sdmmc_post_req, @@ -1317,6 +1372,7 @@ static const struct mmc_host_ops realtek_pci_sdmmc_ops = { .get_cd = sdmmc_get_cd, .start_signal_voltage_switch = sdmmc_switch_voltage, .execute_tuning = sdmmc_execute_tuning, + .init_sd_express = sdmmc_init_sd_express, }; static void init_extra_caps(struct realtek_pci_sdmmc *host) @@ -1338,6 +1394,8 @@ static void init_extra_caps(struct realtek_pci_sdmmc *host) mmc->caps |= MMC_CAP_8_BIT_DATA; if (pcr->extra_caps & EXTRA_CAPS_NO_MMC) mmc->caps2 |= MMC_CAP2_NO_MMC; + if (pcr->extra_caps & EXTRA_CAPS_SD_EXPRESS) + mmc->caps2 |= MMC_CAP2_SD_EXP | MMC_CAP2_SD_EXP_1_2V; } static void realtek_init_host(struct realtek_pci_sdmmc *host) -- cgit v1.2.3