Commit 375b5359 authored by Avri Altman's avatar Avri Altman Committed by Ulf Hansson
Browse files

mmc: sd: Add Extension memory addressing 



SDUC memory addressing spans beyond 2TB and up to 128TB.  Therefore, 38
bits are required to access the entire memory space of all sectors.
Those extra 6 bits are to be carried by CMD22 prior of sending
read/write/erase commands: CMD17, CMD18, CMD24, CMD25, CMD32, and CMD33.

CMD22 will carry the higher order 6 bits, and must precedes any of the
above commands even if it targets sector < 2TB.

No error related to address or length is indicated in CMD22 but rather
in the read/write command itself.

Tested-by: default avatarRicky WU <ricky_wu@realtek.com>
Reviewed-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarAvri Altman <avri.altman@wdc.com>
Link: https://lore.kernel.org/r/20241006051148.160278-3-avri.altman@wdc.com


Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent fce2ce78

drivers/mmc/core/sd_ops.c

+15 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/mmc/sd.h>



#include "core.h"

#include "card.h"

#include "sd_ops.h"

#include "mmc_ops.h"
@@ -188,6 +189,20 @@ int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) 
	return 0;

}



int mmc_send_ext_addr(struct mmc_host *host, u32 addr)

{

	struct mmc_command cmd = {

		.opcode = SD_ADDR_EXT,

		.arg = addr,

		.flags = MMC_RSP_R1 | MMC_CMD_AC,

	};



	if (!mmc_card_ult_capacity(host->card))

		return 0;



	return mmc_wait_for_cmd(host, &cmd, 0);

}



static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8 pcie_bits,

			      u32 *resp)

{

drivers/mmc/core/sd_ops.h

+1 −0
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca); 
int mmc_app_send_scr(struct mmc_card *card);

int mmc_app_sd_status(struct mmc_card *card, void *ssr);

int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card);

int mmc_send_ext_addr(struct mmc_host *host, u32 addr);



#endif

include/linux/mmc/sd.h

+3 −0
Original line number Diff line number Diff line
@@ -15,6 +15,9 @@ 
#define SD_SEND_IF_COND           8   /* bcr  [11:0] See below   R7  */

#define SD_SWITCH_VOLTAGE         11  /* ac                      R1  */



/* Class 2 */

#define SD_ADDR_EXT		 22   /* ac   [5:0]              R1  */



  /* class 10 */

#define SD_SWITCH                 6   /* adtc [31:0] See below   R1  */