linux-kernel - Re: [PATCH v1 1/1] mmc: sdhci-acpi: Add support for NVIDIA BlueField-3 SoC

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Date:   Mon, 15 Mar 2021 10:33:30 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Liming Sun <limings@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Khalil Blaiech <kblaiech@...dia.com>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] mmc: sdhci-acpi: Add support for NVIDIA
 BlueField-3 SoC

On 12/03/21 3:48 pm, Liming Sun wrote:
> This commit adds ACPI support for the BlueField-3 SoC which uses
> the DWC_mshc eMMC controller. The boundary check logic in static
> function dwcmshc_adma_write_desc() comes from sdhci-of-dwcmshc.c.

Did you consider adding ACPI support to sdhci-of-dwcmshc.c ?
Other drivers have taken that approach, see sdhci-xenon.c or sdhci-iproc.c

> 
> Signed-off-by: Liming Sun <limings@...dia.com>
> Reviewed-by: Khalil Blaiech <kblaiech@...dia.com>
> ---
>  drivers/mmc/host/sdhci-acpi.c | 64 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 64 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
> index 54205e3..6448e94e 100644
> --- a/drivers/mmc/host/sdhci-acpi.c
> +++ b/drivers/mmc/host/sdhci-acpi.c
> @@ -716,6 +716,68 @@ static int sdhci_acpi_emmc_amd_probe_slot(struct platform_device *pdev,
>  	.priv_size	= sizeof(struct amd_sdhci_host),
>  };
>  
> +/* Check DMA address/length boundary. */
> +static inline bool dwcmshc_adma_boundary_ok(dma_addr_t addr, int len)
> +{
> +	return (addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1));
> +}
> +
> +/*
> + * If DMA addr spans 128MB boundary, we split the DMA transfer into two
> + * so that each DMA transfer doesn't exceed the boundary.
> + */
> +static void dwcmshc_adma_write_desc(struct sdhci_host *host, void **desc,
> +				    dma_addr_t addr, int len, unsigned int cmd)
> +{
> +	int tmplen, offset;
> +
> +	if (likely(!len || dwcmshc_adma_boundary_ok(addr, len))) {
> +		sdhci_adma_write_desc(host, desc, addr, len, cmd);
> +		return;
> +	}
> +
> +	offset = addr & (SZ_128M - 1);
> +	tmplen = SZ_128M - offset;
> +	sdhci_adma_write_desc(host, desc, addr, tmplen, cmd);
> +
> +	addr += tmplen;
> +	len -= tmplen;
> +	sdhci_adma_write_desc(host, desc, addr, len, cmd);
> +}
> +
> +static int sdhci_acpi_emmc_nvda_bf_probe_slot(struct platform_device *pdev,
> +					      struct acpi_device *adev)
> +{
> +	struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
> +	struct sdhci_host *host = c->host;
> +	u32 extra;
> +
> +	/* Extra adma table cnt for cross 128M boundary handling. */
> +	extra = DIV_ROUND_UP_ULL(dma_get_required_mask(&pdev->dev), SZ_128M);
> +	extra = min(extra, (u32)SDHCI_MAX_SEGS);
> +	host->adma_table_cnt += extra;
> +
> +	return 0;
> +}
> +
> +static const struct sdhci_ops sdhci_acpi_ops_nvda_bf = {
> +	.set_clock		= sdhci_set_clock,
> +	.set_bus_width		= sdhci_set_bus_width,
> +	.set_uhs_signaling	= sdhci_set_uhs_signaling,
> +	.reset			= sdhci_reset,
> +	.adma_write_desc	= dwcmshc_adma_write_desc,
> +};
> +
> +static const struct sdhci_acpi_chip sdhci_acpi_chip_nvda_bf = {
> +	.ops = &sdhci_acpi_ops_nvda_bf,
> +};
> +
> +static const struct sdhci_acpi_slot sdhci_acpi_slot_nvda_bf_emmc = {
> +	.chip		= &sdhci_acpi_chip_nvda_bf,
> +	.caps		= MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE,
> +	.probe_slot	= sdhci_acpi_emmc_nvda_bf_probe_slot,
> +};
> +
>  struct sdhci_acpi_uid_slot {
>  	const char *hid;
>  	const char *uid;
> @@ -740,6 +802,7 @@ struct sdhci_acpi_uid_slot {
>  	{ "QCOM8051", NULL, &sdhci_acpi_slot_qcom_sd_3v },
>  	{ "QCOM8052", NULL, &sdhci_acpi_slot_qcom_sd },
>  	{ "AMDI0040", NULL, &sdhci_acpi_slot_amd_emmc },
> +	{ "MLNXBF30", NULL, &sdhci_acpi_slot_nvda_bf_emmc },
>  	{ },
>  };
>  
> @@ -757,6 +820,7 @@ struct sdhci_acpi_uid_slot {
>  	{ "QCOM8051" },
>  	{ "QCOM8052" },
>  	{ "AMDI0040" },
> +	{ "MLNXBF30" },
>  	{ },
>  };
>  MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
>