linux-kernel - Re: [PATCH v5 4/4] mmc: sdhci-of-aspeed: Configure the SDHCIs as specified by the devicetree.

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Message-ID: <CAPDyKFqd+ZdPVuFKf-C7ztQp_aH9HOXByq6qwykkdU9Aku3pAA@mail.gmail.com>
Date:   Mon, 24 May 2021 16:11:08 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Steven Lee <steven_lee@...eedtech.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        "moderated list:ASPEED SD/MMC DRIVER" <openbmc@...ts.ozlabs.org>,
        Hongweiz@....com, ryan_chen@...eedtech.com,
        chin-ting_kuo@...eedtech.com
Subject: Re: [PATCH v5 4/4] mmc: sdhci-of-aspeed: Configure the SDHCIs as
 specified by the devicetree.

On Mon, 24 May 2021 at 09:33, Steven Lee <steven_lee@...eedtech.com> wrote:
>
> The hardware provides capability configuration registers for each SDHCI
> in the global configuration space for the SD controller. Writes to the
> global capability registers are mirrored to the capability registers in
> the associated SDHCI. Configuration of the capabilities must be written
> through the mirror registers prior to initialisation of the SDHCI.
>
> Signed-off-by: Steven Lee <steven_lee@...eedtech.com>
> Reviewed-by: Andrew Jeffery <andrew@...id.au>
> Reviewed-by: Joel Stanley <joel@....id.au>

Applied for next, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/sdhci-of-aspeed.c | 48 ++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
> index d001c51074a0..65b5685f6c15 100644
> --- a/drivers/mmc/host/sdhci-of-aspeed.c
> +++ b/drivers/mmc/host/sdhci-of-aspeed.c
> @@ -31,6 +31,11 @@
>  #define   ASPEED_SDC_S0_PHASE_OUT_EN   GENMASK(1, 0)
>  #define   ASPEED_SDC_PHASE_MAX         31
>
> +/* SDIO{10,20} */
> +#define ASPEED_SDC_CAP1_1_8V           (0 * 32 + 26)
> +/* SDIO{14,24} */
> +#define ASPEED_SDC_CAP2_SDR104         (1 * 32 + 1)
> +
>  struct aspeed_sdc {
>         struct clk *clk;
>         struct resource *res;
> @@ -72,6 +77,37 @@ struct aspeed_sdhci {
>         const struct aspeed_sdhci_phase_desc *phase_desc;
>  };
>
> +/*
> + * The function sets the mirror register for updating
> + * capbilities of the current slot.
> + *
> + *   slot | capability  | caps_reg | mirror_reg
> + *   -----|-------------|----------|------------
> + *     0  | CAP1_1_8V   | SDIO140  |   SDIO10
> + *     0  | CAP2_SDR104 | SDIO144  |   SDIO14
> + *     1  | CAP1_1_8V   | SDIO240  |   SDIO20
> + *     1  | CAP2_SDR104 | SDIO244  |   SDIO24
> + */
> +static void aspeed_sdc_set_slot_capability(struct sdhci_host *host, struct aspeed_sdc *sdc,
> +                                          int capability, bool enable, u8 slot)
> +{
> +       u32 mirror_reg_offset;
> +       u32 cap_val;
> +       u8 cap_reg;
> +
> +       if (slot > 1)
> +               return;
> +
> +       cap_reg = capability / 32;
> +       cap_val = sdhci_readl(host, 0x40 + (cap_reg * 4));
> +       if (enable)
> +               cap_val |= BIT(capability % 32);
> +       else
> +               cap_val &= ~BIT(capability % 32);
> +       mirror_reg_offset = ((slot + 1) * 0x10) + (cap_reg * 4);
> +       writel(cap_val, sdc->regs + mirror_reg_offset);
> +}
> +
>  static void aspeed_sdc_configure_8bit_mode(struct aspeed_sdc *sdc,
>                                            struct aspeed_sdhci *sdhci,
>                                            bool bus8)
> @@ -328,6 +364,7 @@ static inline int aspeed_sdhci_calculate_slot(struct aspeed_sdhci *dev,
>  static int aspeed_sdhci_probe(struct platform_device *pdev)
>  {
>         const struct aspeed_sdhci_pdata *aspeed_pdata;
> +       struct device_node *np = pdev->dev.of_node;
>         struct sdhci_pltfm_host *pltfm_host;
>         struct aspeed_sdhci *dev;
>         struct sdhci_host *host;
> @@ -372,6 +409,17 @@ static int aspeed_sdhci_probe(struct platform_device *pdev)
>
>         sdhci_get_of_property(pdev);
>
> +       if (of_property_read_bool(np, "mmc-hs200-1_8v") ||
> +           of_property_read_bool(np, "sd-uhs-sdr104")) {
> +               aspeed_sdc_set_slot_capability(host, dev->parent, ASPEED_SDC_CAP1_1_8V,
> +                                              true, slot);
> +       }
> +
> +       if (of_property_read_bool(np, "sd-uhs-sdr104")) {
> +               aspeed_sdc_set_slot_capability(host, dev->parent, ASPEED_SDC_CAP2_SDR104,
> +                                              true, slot);
> +       }
> +
>         pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
>         if (IS_ERR(pltfm_host->clk))
>                 return PTR_ERR(pltfm_host->clk);
> --
> 2.17.1
>