Commit eb81ed51 authored by Liming Sun's avatar Liming Sun Committed by Ulf Hansson
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mmc: sdhci-of-dwcmshc: add ACPI support for BlueField-3 SoC 



This commit adds ACPI support in the sdhci-of-dwcmshc driver for
BlueField-3 SoC. It has changes to only use the clock hierarchy
for Deviec Tree since the clk is not supported by ACPI. Instead,
ACPI can define 'clock-frequency' which is parsed by existing
sdhci_get_property(). This clock value will be returned in function
dwcmshc_get_max_clock().

Signed-off-by: default avatarLiming Sun <limings@nvidia.com>
Reviewed-by: default avatarKhalil Blaiech <kblaiech@nvidia.com>
Link: https://lore.kernel.org/r/1616453211-275165-1-git-send-email-limings@nvidia.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent ee629112

drivers/mmc/host/sdhci-of-dwcmshc.c

+36 −14
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
 * Author: Jisheng Zhang <jszhang@kernel.org>

 */



#include <linux/acpi.h>

#include <linux/clk.h>

#include <linux/dma-mapping.h>

#include <linux/iopoll.h>
@@ -94,6 +95,16 @@ static void dwcmshc_adma_write_desc(struct sdhci_host *host, void **desc, 
	sdhci_adma_write_desc(host, desc, addr, len, cmd);

}



static unsigned int dwcmshc_get_max_clock(struct sdhci_host *host)

{

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);



	if (pltfm_host->clk)

		return sdhci_pltfm_clk_get_max_clock(host);

	else

		return pltfm_host->clock;

}



static void dwcmshc_check_auto_cmd23(struct mmc_host *mmc,

				     struct mmc_request *mrq)

{
@@ -248,7 +259,7 @@ static const struct sdhci_ops sdhci_dwcmshc_ops = { 
	.set_clock		= sdhci_set_clock,

	.set_bus_width		= sdhci_set_bus_width,

	.set_uhs_signaling	= dwcmshc_set_uhs_signaling,

	.get_max_clock		= sdhci_pltfm_clk_get_max_clock,

	.get_max_clock		= dwcmshc_get_max_clock,

	.reset			= sdhci_reset,

	.adma_write_desc	= dwcmshc_adma_write_desc,

};
@@ -323,8 +334,16 @@ static const struct of_device_id sdhci_dwcmshc_dt_ids[] = { 
};

MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids);



#ifdef CONFIG_ACPI

static const struct acpi_device_id sdhci_dwcmshc_acpi_ids[] = {

	{ .id = "MLNXBF30" },

	{}

};

#endif



static int dwcmshc_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct sdhci_pltfm_host *pltfm_host;

	struct sdhci_host *host;

	struct dwcmshc_priv *priv;
@@ -347,7 +366,7 @@ static int dwcmshc_probe(struct platform_device *pdev) 
	/*

	 * extra adma table cnt for cross 128M boundary handling.

	 */

	extra = DIV_ROUND_UP_ULL(dma_get_required_mask(&pdev->dev), SZ_128M);

	extra = DIV_ROUND_UP_ULL(dma_get_required_mask(dev), SZ_128M);

	if (extra > SDHCI_MAX_SEGS)

		extra = SDHCI_MAX_SEGS;

	host->adma_table_cnt += extra;
@@ -355,19 +374,21 @@ static int dwcmshc_probe(struct platform_device *pdev) 
	pltfm_host = sdhci_priv(host);

	priv = sdhci_pltfm_priv(pltfm_host);



	pltfm_host->clk = devm_clk_get(&pdev->dev, "core");

	if (dev->of_node) {

		pltfm_host->clk = devm_clk_get(dev, "core");

		if (IS_ERR(pltfm_host->clk)) {

			err = PTR_ERR(pltfm_host->clk);

		dev_err(&pdev->dev, "failed to get core clk: %d\n", err);

			dev_err(dev, "failed to get core clk: %d\n", err);

			goto free_pltfm;

		}

		err = clk_prepare_enable(pltfm_host->clk);

		if (err)

			goto free_pltfm;



	priv->bus_clk = devm_clk_get(&pdev->dev, "bus");

		priv->bus_clk = devm_clk_get(dev, "bus");

		if (!IS_ERR(priv->bus_clk))

			clk_prepare_enable(priv->bus_clk);

	}



	err = mmc_of_parse(host->mmc);

	if (err)
@@ -489,6 +510,7 @@ static struct platform_driver sdhci_dwcmshc_driver = { 
		.name	= "sdhci-dwcmshc",

		.probe_type = PROBE_PREFER_ASYNCHRONOUS,

		.of_match_table = sdhci_dwcmshc_dt_ids,

		.acpi_match_table = ACPI_PTR(sdhci_dwcmshc_acpi_ids),

		.pm = &dwcmshc_pmops,

	},

	.probe	= dwcmshc_probe,