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Date: Wed, 31 May 2023 19:14:14 +0800
From: Victor Shih <victorshihgli@...il.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: ulf.hansson@...aro.org, 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 V3 3/3] mmc: sdhci-pci-gli: Add support SD Express card
for GL9767
Hi, Adrian
On Wed, May 31, 2023 at 6:17 PM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> On 31/05/23 12:57, 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>
> > ---
> > drivers/mmc/host/sdhci-pci-gli.c | 113 +++++++++++++++++++++++++++++++
> > 1 file changed, 113 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> > index 392a106cea18..bd5185476d0f 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 +185,9 @@
> > #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_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)
> > @@ -191,6 +198,23 @@
> > #define PCIE_GLI_9767_SD_PLL_CTL2 0x93C
> > #define PCIE_GLI_9767_SD_PLL_CTL2_PLLSSC_PPM GENMASK(31, 16)
> >
> > +#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 GLI_MAX_TUNING_LOOP 40
> >
> > /* Genesys Logic chipset */
> > @@ -935,6 +959,93 @@ 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);
>
> Sorry I didn't notice this before but these VDD2 bits should be
> defined:
>
>
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index f4f2085c274c..f219bdea8f28 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -99,6 +99,13 @@
> #define SDHCI_POWER_180 0x0A
> #define SDHCI_POWER_300 0x0C
> #define SDHCI_POWER_330 0x0E
> +/*
> + * VDD2 - UHS2 or PCIe/NVMe
> + * VDD2 power on/off and voltage select
> + */
> +#define SDHCI_VDD2_POWER_ON 0x10
> +#define SDHCI_VDD2_POWER_120 0x80
> +#define SDHCI_VDD2_POWER_180 0xA0
>
> #define SDHCI_BLOCK_GAP_CONTROL 0x2A
>
>
>
I will update it in patch v4.
> > + 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) {
> > + 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);
> > +
> > + value = sdhci_readb(host, SDHCI_POWER_CONTROL);
> > + value &= ~((SDHCI_POWER_180 | SDHCI_POWER_ON) << 4);
>
> See above
>
I will update it in patch v4.
> > + sdhci_writeb(host, value, SDHCI_POWER_CONTROL);
> > +
> > + value = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> > + value |= (SDHCI_CLOCK_CARD_EN | SDHCI_CLOCK_PLL_EN);
> > + sdhci_writew(host, value, SDHCI_CLOCK_CONTROL);
> > + }
> > +
> > + 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 +1078,8 @@ 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;
>
Thanks, Victor Shih
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