Commit 9b1c779d authored by Victor Shih's avatar Victor Shih Committed by Ulf Hansson
Browse files

mmc: sdhci-uhs2: add reset function 



Sdhci_uhs2_reset() does a UHS-II specific reset operation.

Signed-off-by: default avatarBen Chuang <ben.chuang@genesyslogic.com.tw>
Signed-off-by: default avatarAKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: default avatarVictor Shih <victor.shih@genesyslogic.com.tw>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Message-ID: <20241018105333.4569-6-victorshihgli@gmail.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 0f8186f1

drivers/mmc/host/sdhci-uhs2.c

+37 −0
Original line number Diff line number Diff line
@@ -10,7 +10,9 @@ 
 *  Author: AKASHI Takahiro <takahiro.akashi@linaro.org>

 */



#include <linux/delay.h>

#include <linux/module.h>

#include <linux/iopoll.h>



#include "sdhci.h"

#include "sdhci-uhs2.h"
@@ -21,6 +23,8 @@ 
#define SDHCI_UHS2_DUMP(f, x...) \

	pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)



#define UHS2_RESET_TIMEOUT_100MS		100000



void sdhci_uhs2_dump_regs(struct sdhci_host *host)

{

	if (!(mmc_card_uhs2(host->mmc)))
@@ -49,6 +53,39 @@ void sdhci_uhs2_dump_regs(struct sdhci_host *host) 
}

EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs);



/*****************************************************************************\

 *                                                                           *

 * Low level functions                                                       *

 *                                                                           *

\*****************************************************************************/



/**

 * sdhci_uhs2_reset - invoke SW reset

 * @host: SDHCI host

 * @mask: Control mask

 *

 * Invoke SW reset, depending on a bit in @mask and wait for completion.

 */

void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask)

{

	u32 val;



	sdhci_writew(host, mask, SDHCI_UHS2_SW_RESET);



	if (mask & SDHCI_UHS2_SW_RESET_FULL)

		host->clock = 0;



	/* hw clears the bit when it's done */

	if (read_poll_timeout_atomic(sdhci_readw, val, !(val & mask), 10,

				     UHS2_RESET_TIMEOUT_100MS, true, host, SDHCI_UHS2_SW_RESET)) {

		pr_warn("%s: %s: Reset 0x%x never completed. %s: clean reset bit.\n", __func__,

			mmc_hostname(host->mmc), (int)mask, mmc_hostname(host->mmc));

		sdhci_writeb(host, 0, SDHCI_UHS2_SW_RESET);

		return;

	}

}

EXPORT_SYMBOL_GPL(sdhci_uhs2_reset);



/*****************************************************************************\

 *                                                                           *

 * Driver init/exit                                                          *

drivers/mmc/host/sdhci-uhs2.h

+1 −0
Original line number Diff line number Diff line
@@ -175,5 +175,6 @@ 
struct sdhci_host;



void sdhci_uhs2_dump_regs(struct sdhci_host *host);

void sdhci_uhs2_reset(struct sdhci_host *host, u16 mask);



#endif /* __SDHCI_UHS2_H */