Commit 7e5b19f3 authored by Victor Shih's avatar Victor Shih Committed by Ulf Hansson
Browse files

mmc: sdhci-uhs2: add set_timeout() 



This is a UHS-II version of sdhci's set_timeout() operation.
Use sdhci_uhs2_set_timeout() to set and calculate the timeout time.

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: <20241018105333.4569-8-victorshihgli@gmail.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 6eb2c8e1

drivers/mmc/host/sdhci-uhs2.c

+72 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/delay.h>

#include <linux/module.h>

#include <linux/iopoll.h>

#include <linux/bitfield.h>



#include "sdhci.h"

#include "sdhci-uhs2.h"
@@ -135,6 +136,77 @@ void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, unsigned 
}

EXPORT_SYMBOL_GPL(sdhci_uhs2_set_power);



static u8 sdhci_calc_timeout_uhs2(struct sdhci_host *host, u8 *cmd_res, u8 *dead_lock)

{

	/* timeout in us */

	unsigned int dead_lock_timeout = 1 * 1000 * 1000;

	unsigned int cmd_res_timeout = 5 * 1000;

	unsigned int current_timeout;

	u8 count;



	/*

	 * Figure out needed cycles.

	 * We do this in steps in order to fit inside a 32 bit int.

	 * The first step is the minimum timeout, which will have a

	 * minimum resolution of 6 bits:

	 * (1) 2^13*1000 > 2^22,

	 * (2) host->timeout_clk < 2^16

	 *     =>

	 *     (1) / (2) > 2^6

	 */

	count = 0;

	current_timeout = (1 << 13) * 1000 / host->timeout_clk;

	while (current_timeout < cmd_res_timeout) {

		count++;

		current_timeout <<= 1;

		if (count >= 0xF)

			break;

	}



	if (count >= 0xF) {

		DBG("%s: Too large timeout 0x%x requested for CMD_RES!\n",

		    mmc_hostname(host->mmc), count);

		count = 0xE;

	}

	*cmd_res = count;



	count = 0;

	current_timeout = (1 << 13) * 1000 / host->timeout_clk;

	while (current_timeout < dead_lock_timeout) {

		count++;

		current_timeout <<= 1;

		if (count >= 0xF)

			break;

	}



	if (count >= 0xF) {

		DBG("%s: Too large timeout 0x%x requested for DEADLOCK!\n",

		    mmc_hostname(host->mmc), count);

		count = 0xE;

	}

	*dead_lock = count;



	return count;

}



static void __sdhci_uhs2_set_timeout(struct sdhci_host *host)

{

	u8 cmd_res, dead_lock;



	sdhci_calc_timeout_uhs2(host, &cmd_res, &dead_lock);

	cmd_res |= FIELD_PREP(SDHCI_UHS2_TIMER_CTRL_DEADLOCK_MASK, dead_lock);

	sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);

}



void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)

{

	__sdhci_set_timeout(host, cmd);



	if (mmc_card_uhs2(host->mmc))

		__sdhci_uhs2_set_timeout(host);

}

EXPORT_SYMBOL_GPL(sdhci_uhs2_set_timeout);



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

 *                                                                           *

 * Driver init/exit                                                          *

drivers/mmc/host/sdhci-uhs2.h

+2 −0
Original line number Diff line number Diff line
@@ -173,9 +173,11 @@ 
#define SDHCI_UHS2_VENDOR_PTR			0xE8



struct sdhci_host;

struct mmc_command;



void sdhci_uhs2_dump_regs(struct sdhci_host *host);

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

void sdhci_uhs2_set_power(struct sdhci_host *host, unsigned char mode, unsigned short vdd);

void sdhci_uhs2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);



#endif /* __SDHCI_UHS2_H */