Re: [PATCH V1 3/3] mmc: sdhci-pci-gli: Add support SD Express card for GL9767

From: Victor Shih
Date: Tue May 30 2023 - 05:52:16 EST

Hi, Ben

On Mon, May 15, 2023 at 8:15 AM Ben Chuang <benchuanggli@xxxxxxxxx> wrote:
>
> Hi Victor,
>
> On Fri, May 12, 2023 at 6:47 PM Victor Shih <victorshihgli@xxxxxxxxx> wrote:
> >
> > 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 and write protect is not
> > enable, then init_sd_express() will be invoked.
> > 4. GL9767 switch from SD mode to PCIe/NVMe mode and mmc driver
> > handover control to NVMe driver.
> > 5. If card is removed, GL9767 will return to SD mode.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> > ---
> > drivers/mmc/host/sdhci-pci-gli.c | 115 +++++++++++++++++++++++++++++++
> > 1 file changed, 115 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> > index 300512740cb0..a0f9c24439be 100644
> > --- a/drivers/mmc/host/sdhci-pci-gli.c
> > +++ b/drivers/mmc/host/sdhci-pci-gli.c
> > @@ -158,6 +158,13 @@
> > #define GLI_9767_VHS_REV_M 0x1
> > #define GLI_9767_VHS_REV_W 0x2
> >
> > +#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)
> > @@ -175,6 +182,27 @@
> > #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_REG2_SDEI_GEN_TIMER GENMASK(1, 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 GENMASK(1, 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 GENMASK(1, 0)
> > +
> > #define GLI_MAX_TUNING_LOOP 40
> >
> > /* Genesys Logic chipset */
> > @@ -774,6 +802,91 @@ 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 (sdhci_check_ro(host)) {
> > + mmc->ios.timing &= ~(MMC_TIMING_SD_EXP | MMC_TIMING_SD_EXP_1_2V);
> > + return 0;
> > + }
> > +
> > + pci_read_config_dword(pdev, PCIE_GLI_9767_VHS, &value);
> > + value &= ~GLI_9767_VHS_REV;
> > + value |= FIELD_PREP(GLI_9767_VHS_REV, GLI_9767_VHS_REV_W);
> > + pci_write_config_dword(pdev, PCIE_GLI_9767_VHS, value);
> > +
> > + 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_GEN_TIMER;
> > + 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 < 10; i++) {
> > + mdelay(10);
>
> A little question.
> Can you explain or comment on the reason for up to 10 loops (max. 100 ms wait),
> For example "because of asic specs..." or "hardware measurements".
>
> Best regards,
> Ben
>

Because specs define the time between Power valid to CLKREQ at most 1ms.
To be on the safe side I will update to 3 loops(max. 30 ms wait) in Patch v2.

> > + 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);
> > + }
> > +
> > + pci_read_config_dword(pdev, PCIE_GLI_9767_VHS, &value);
> > + value &= ~GLI_9767_VHS_REV;
> > + value |= FIELD_PREP(GLI_9767_VHS_REV, GLI_9767_VHS_REV_R);
> > + pci_write_config_dword(pdev, PCIE_GLI_9767_VHS, value);
> > +
> > + return 0;
> > +}
> > +
> > static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
> > {
> > struct sdhci_host *host = slot->host;
> > @@ -806,6 +919,8 @@ 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;
> > --
> > 2.25.1
> >

Thanks, Victor Shih