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Date: Wed, 31 May 2023 10:14:42 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Victor Shih <victorshihgli@...il.com>, ulf.hansson@...aro.org
Cc: linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
benchuanggli@...il.com, HL.Liu@...esyslogic.com.tw,
Greg.tu@...esyslogic.com.tw,
Ben Chuang <ben.chuang@...esyslogic.com.tw>,
Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: Re: [PATCH V2 3/3] mmc: sdhci-pci-gli: Add support SD Express card
for GL9767
On 30/05/23 12:53, Victor Shih wrote:
> From: Victor Shih <victor.shih@...esyslogic.com.tw>
>
> Add support SD Express card for GL9767. The workflow of the
> SD Express card in GL9767 is as below.
> 1. GL9767 operates in SD mode and set MMC_CAP2_SD_EXP flag.
> 2. If card is inserted, Host send CMD8 to ask the capabilities
> of the card.
> 3. If the card has PCIe capability, then init_sd_express()
> will be invoked.
> 4. If the card has been put in write protect state then the
> SD features supported by SD mode but not supported by
> PCIe mode, therefore GL9767 switch to SD mode.
> 5. If the card has not been put in write protect state then
> GL9767 switch from SD mode to PCIe/NVMe mode and mmc driver
> handover control to NVMe driver.
> 6. If card is removed, GL9767 will return to SD mode.
>
> Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
> drivers/mmc/host/sdhci-pci-gli.c | 105 +++++++++++++++++++++++++++++++
> 1 file changed, 105 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> index 178253a7e86f..c7fa92fdadcd 100644
> --- a/drivers/mmc/host/sdhci-pci-gli.c
> +++ b/drivers/mmc/host/sdhci-pci-gli.c
> @@ -164,6 +164,10 @@
> #define PCIE_GLI_9767_CFG 0x8A0
> #define PCIE_GLI_9767_CFG_LOW_PWR_OFF BIT(12)
>
> +#define PCIE_GLI_9767_COMBO_MUX_CTL 0x8C8
> +#define PCIE_GLI_9767_COMBO_MUX_CTL_RST_EN BIT(6)
> +#define PCIE_GLI_9767_COMBO_MUX_CTL_WAIT_PERST_EN BIT(10)
> +
> #define PCIE_GLI_9767_PWR_MACRO_CTL 0x8D0
> #define PCIE_GLI_9767_PWR_MACRO_CTL_LOW_VOLTAGE GENMASK(3, 0)
> #define PCIE_GLI_9767_PWR_MACRO_CTL_LD0_LOW_OUTPUT_VOLTAGE GENMASK(15, 12)
> @@ -181,6 +185,26 @@
> #define PCIE_GLI_9767_SCR_CORE_PWR_D3_OFF BIT(21)
> #define PCIE_GLI_9767_SCR_CFG_RST_DATA_LINK_DOWN BIT(30)
>
> +#define PCIE_GLI_9767_SDHC_CAP 0x91C
> +#define PCIE_GLI_9767_SDHC_CAP_SDEI_RESULT BIT(5)
> +
> +#define PCIE_GLI_9767_SD_EXPRESS_CTL 0x940
> +#define PCIE_GLI_9767_SD_EXPRESS_CTL_SDEI_EXE BIT(0)
> +#define PCIE_GLI_9767_SD_EXPRESS_CTL_SD_EXPRESS_MODE BIT(1)
> +
> +#define PCIE_GLI_9767_SD_DATA_MULTI_CTL 0x944
> +#define PCIE_GLI_9767_SD_DATA_MULTI_CTL_DISCONNECT_TIME GENMASK(23, 16)
> +#define PCIE_GLI_9767_SD_DATA_MULTI_CTL_DISCONNECT_TIME_VALUE 0x64
> +
> +#define PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_REG2 0x950
> +#define PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_REG2_SDEI_COMPLETE BIT(0)
> +
> +#define PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_EN_REG2 0x954
> +#define PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_EN_REG2_SDEI_COMPLETE_STATUS_EN BIT(0)
> +
> +#define PCIE_GLI_9767_NORMAL_ERR_INT_SIGNAL_EN_REG2 0x958
> +#define PCIE_GLI_9767_NORMAL_ERR_INT_SIGNAL_EN_REG2_SDEI_COMPLETE_SIGNAL_EN BIT(0)
> +
> #define PCIE_GLI_9767_SD_PLL_CTL 0x938
> #define PCIE_GLI_9767_SD_PLL_CTL_PLL_LDIV GENMASK(9, 0)
> #define PCIE_GLI_9767_SD_PLL_CTL_PLL_PDIV GENMASK(15, 12)
> @@ -935,6 +959,85 @@ static void sdhci_gl9767_reset(struct sdhci_host *host, u8 mask)
> gli_set_9767(host);
> }
>
> +static int gl9767_init_sd_express(struct mmc_host *mmc, struct mmc_ios *ios)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + struct sdhci_pci_slot *slot = sdhci_priv(host);
> + struct pci_dev *pdev;
> + u32 value;
> + int i;
> +
> + pdev = slot->chip->pdev;
> +
> + if (mmc->ops->get_ro(mmc)) {
> + mmc->ios.timing &= ~(MMC_TIMING_SD_EXP | MMC_TIMING_SD_EXP_1_2V);
> + return 0;
> + }
> +
> + gl9767_vhs_write(pdev);
> +
> + pci_read_config_dword(pdev, PCIE_GLI_9767_COMBO_MUX_CTL, &value);
> + value &= ~(PCIE_GLI_9767_COMBO_MUX_CTL_RST_EN | PCIE_GLI_9767_COMBO_MUX_CTL_WAIT_PERST_EN);
> + pci_write_config_dword(pdev, PCIE_GLI_9767_COMBO_MUX_CTL, value);
> +
> + pci_read_config_dword(pdev, PCIE_GLI_9767_SD_DATA_MULTI_CTL, &value);
> + value &= ~PCIE_GLI_9767_SD_DATA_MULTI_CTL_DISCONNECT_TIME;
> + value |= FIELD_PREP(PCIE_GLI_9767_SD_DATA_MULTI_CTL_DISCONNECT_TIME,
> + PCIE_GLI_9767_SD_DATA_MULTI_CTL_DISCONNECT_TIME_VALUE);
> + pci_write_config_dword(pdev, PCIE_GLI_9767_SD_DATA_MULTI_CTL, value);
> +
> + pci_read_config_dword(pdev, PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_REG2, &value);
> + value |= PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_REG2_SDEI_COMPLETE;
> + pci_write_config_dword(pdev, PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_REG2, value);
> +
> + pci_read_config_dword(pdev, PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_EN_REG2, &value);
> + value |= PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_EN_REG2_SDEI_COMPLETE_STATUS_EN;
> + pci_write_config_dword(pdev, PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_EN_REG2, value);
> +
> + pci_read_config_dword(pdev, PCIE_GLI_9767_NORMAL_ERR_INT_SIGNAL_EN_REG2, &value);
> + value |= PCIE_GLI_9767_NORMAL_ERR_INT_SIGNAL_EN_REG2_SDEI_COMPLETE_SIGNAL_EN;
> + pci_write_config_dword(pdev, PCIE_GLI_9767_NORMAL_ERR_INT_SIGNAL_EN_REG2, value);
> +
> + pci_read_config_dword(pdev, PCIE_GLI_9767_CFG, &value);
> + value |= PCIE_GLI_9767_CFG_LOW_PWR_OFF;
> + pci_write_config_dword(pdev, PCIE_GLI_9767_CFG, value);
> +
> + value = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> + value &= ~(SDHCI_CLOCK_CARD_EN | SDHCI_CLOCK_PLL_EN);
> + sdhci_writew(host, value, SDHCI_CLOCK_CONTROL);
> +
> + value = sdhci_readb(host, SDHCI_POWER_CONTROL);
> + value |= ((SDHCI_POWER_180 | SDHCI_POWER_ON) << 4);
> + sdhci_writeb(host, value, SDHCI_POWER_CONTROL);
> +
> + pci_read_config_dword(pdev, PCIE_GLI_9767_SD_EXPRESS_CTL, &value);
> + value |= PCIE_GLI_9767_SD_EXPRESS_CTL_SDEI_EXE;
> + pci_write_config_dword(pdev, PCIE_GLI_9767_SD_EXPRESS_CTL, value);
> +
> + for (i = 0; i < 2; i++) {
> + msleep(10);
> + pci_read_config_dword(pdev, PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_REG2, &value);
> + if (value & PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_REG2_SDEI_COMPLETE) {
> + pci_write_config_dword(pdev, PCIE_GLI_9767_NORMAL_ERR_INT_STATUS_REG2,
> + value);
> + break;
> + }
> + }
> +
> + pci_read_config_dword(pdev, PCIE_GLI_9767_SDHC_CAP, &value);
> + if ((value & PCIE_GLI_9767_SDHC_CAP_SDEI_RESULT) == PCIE_GLI_9767_SDHC_CAP_SDEI_RESULT) {
> + pci_read_config_dword(pdev, PCIE_GLI_9767_SD_EXPRESS_CTL, &value);
> + value |= PCIE_GLI_9767_SD_EXPRESS_CTL_SD_EXPRESS_MODE;
> + pci_write_config_dword(pdev, PCIE_GLI_9767_SD_EXPRESS_CTL, value);
> + } else {
> + mmc->ios.timing &= ~(MMC_TIMING_SD_EXP | MMC_TIMING_SD_EXP_1_2V);
> + }
> +
> + gl9767_vhs_read(pdev);
> +
> + return 0;
> +}
> +
> static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
> {
> struct sdhci_host *host = slot->host;
> @@ -967,6 +1070,8 @@ static int gli_probe_slot_gl9767(struct sdhci_pci_slot *slot)
> gl9767_hw_setting(slot);
> gli_pcie_enable_msi(slot);
> slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
> + host->mmc->caps2 |= MMC_CAP2_SD_EXP;
> + host->mmc_host_ops.init_sd_express = gl9767_init_sd_express;
> sdhci_enable_v4_mode(host);
>
> return 0;
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