linux-kernel - Re: [PATCH 2/2] tpm: tis: add support for MMIO TPM on SynQuacer

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Date:   Tue, 14 Jan 2020 11:13:13 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Masahisa Kojima <masahisa.kojima@...aro.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        linux-integrity <linux-integrity@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Hüwe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>
Subject: Re: [PATCH 2/2] tpm: tis: add support for MMIO TPM on SynQuacer

On Tue, 14 Jan 2020 at 10:46, Ard Biesheuvel <ardb@...nel.org> wrote:
>
> When fitted, the SynQuacer platform exposes its SPI TPM via a MMIO
> window that is backed by the SPI command sequencer in the SPI bus
> controller. This arrangement has the limitation that only byte size
> accesses are supported, and so we'll need to provide a separate set
> of read and write accessors that take this into account.
>
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> ---
>  drivers/char/tpm/tpm_tis.c | 31 ++++++++++++++++++--
>  1 file changed, 29 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index e7df342a317d..693e48096035 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -32,6 +32,7 @@
>
>  struct tpm_info {
>         struct resource res;
> +       const struct tpm_tis_phy_ops *ops;
>         /* irq > 0 means: use irq $irq;
>          * irq = 0 means: autoprobe for an irq;
>          * irq = -1 means: no irq support
> @@ -186,6 +187,29 @@ static const struct tpm_tis_phy_ops tpm_tcg = {
>         .write32 = tpm_tcg_write32,
>  };
>
> +static int tpm_tcg_read16_bw(struct tpm_tis_data *data, u32 addr, u16 *result)
> +{
> +       return tpm_tcg_read_bytes(data, addr, 2, (u8 *)result);
> +}
> +
> +static int tpm_tcg_read32_bw(struct tpm_tis_data *data, u32 addr, u32 *result)
> +{
> +       return tpm_tcg_read_bytes(data, addr, 4, (u8 *)result);
> +}
> +
> +static int tpm_tcg_write32_bw(struct tpm_tis_data *data, u32 addr, u32 value)
> +{
> +       return tpm_tcg_write_bytes(data, addr, 4, (u8 *)&value);
> +}
> +

These are wrong - I'll need to respin. Apologies for the noise.

> +static const struct tpm_tis_phy_ops tpm_tcg_bw = {
> +       .read_bytes     = tpm_tcg_read_bytes,
> +       .write_bytes    = tpm_tcg_write_bytes,
> +       .read16         = tpm_tcg_read16_bw,
> +       .read32         = tpm_tcg_read32_bw,
> +       .write32        = tpm_tcg_write32_bw,
> +};
> +
>  static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info)
>  {
>         struct tpm_tis_tcg_phy *phy;
> @@ -210,7 +234,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info)
>         if (itpm || is_itpm(ACPI_COMPANION(dev)))
>                 phy->priv.flags |= TPM_TIS_ITPM_WORKAROUND;
>
> -       return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
> +       return tpm_tis_core_init(dev, &phy->priv, irq, tpm_info->ops,
>                                  ACPI_HANDLE(dev));
>  }
>
> @@ -219,7 +243,7 @@ static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
>  static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
>                             const struct pnp_device_id *pnp_id)
>  {
> -       struct tpm_info tpm_info = {};
> +       struct tpm_info tpm_info = { .ops = &tpm_tcg };
>         struct resource *res;
>
>         res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
> @@ -295,6 +319,8 @@ static int tpm_tis_plat_probe(struct platform_device *pdev)
>                         tpm_info.irq = 0;
>         }
>
> +       tpm_info.ops = of_device_get_match_data(&pdev->dev) ?: &tpm_tcg;
> +
>         return tpm_tis_init(&pdev->dev, &tpm_info);
>  }
>
> @@ -311,6 +337,7 @@ static int tpm_tis_plat_remove(struct platform_device *pdev)
>  #ifdef CONFIG_OF
>  static const struct of_device_id tis_of_platform_match[] = {
>         {.compatible = "tcg,tpm-tis-mmio"},
> +       {.compatible = "socionext,synquacer-tpm-mmio", .data = &tpm_tcg_bw},
>         {},
>  };
>  MODULE_DEVICE_TABLE(of, tis_of_platform_match);
> --
> 2.20.1
>