mmc: core: Prepare mmc_send_cxd_data() to be re-used for additional cmds

The function mmc_send_cxd_data() sends a data read command of ADTC type and
prepares to receive an R1 response. To make it even more re-usable, let's
extend it with another in-parameter for the command argument. While at it,
let's also rename the function to mmc_send_adtc_data() as it better
describes its purpose.

Note that, this change doesn't add any new users of the function. Instead
that is done from subsequent changes.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Avri Altman <avri.altman@wdc.com>
Link: https://lore.kernel.org/r/20210504161222.101536-7-ulf.hansson@linaro.org

drivers/mmc/core/mmc_ops.c

@@ -252,9 +252,8 @@ mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
  * NOTE: void *buf, caller for the buf is required to use DMA-capable
  * buffer or on-stack buffer (with some overhead in callee).
  */
-static int
-mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
-		u32 opcode, void *buf, unsigned len)
+int mmc_send_adtc_data(struct mmc_card *card, struct mmc_host *host, u32 opcode,
+		       u32 args, void *buf, unsigned len)
 {
 	struct mmc_request mrq = {};
 	struct mmc_command cmd = {};
@@ -265,7 +264,7 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 	mrq.data = &data;
 
 	cmd.opcode = opcode;
-	cmd.arg = 0;
+	cmd.arg = args;
 
 	/* NOTE HACK:  the MMC_RSP_SPI_R1 is always correct here, but we
 	 * rely on callers to never use this with "native" calls for reading
@@ -311,7 +310,7 @@ static int mmc_spi_send_cxd(struct mmc_host *host, u32 *cxd, u32 opcode)
 	if (!cxd_tmp)
 		return -ENOMEM;
 
-	ret = mmc_send_cxd_data(NULL, host, opcode, cxd_tmp, 16);
+	ret = mmc_send_adtc_data(NULL, host, opcode, 0, cxd_tmp, 16);
 	if (ret)
 		goto err;
 
@@ -359,7 +358,7 @@ int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 	if (!ext_csd)
 		return -ENOMEM;
 
-	err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
+	err = mmc_send_adtc_data(card, card->host, MMC_SEND_EXT_CSD, 0, ext_csd,
 				512);
 	if (err)
 		kfree(ext_csd);

drivers/mmc/core/mmc_ops.h

@@ -26,6 +26,8 @@ int mmc_set_dsr(struct mmc_host *host);
 int mmc_go_idle(struct mmc_host *host);
 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr);
 int mmc_set_relative_addr(struct mmc_card *card);
+int mmc_send_adtc_data(struct mmc_card *card, struct mmc_host *host, u32 opcode,
+		       u32 args, void *buf, unsigned len);
 int mmc_send_csd(struct mmc_card *card, u32 *csd);
 int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries);
 int mmc_send_status(struct mmc_card *card, u32 *status);