diff mbox series

[v6,2/9] mmc: sd: Add Extension memory addressing

Message ID 20240904145256.3670679-3-avri.altman@wdc.com (mailing list archive)
State New
Headers show
Series Add SDUC Support | expand

Commit Message

Avri Altman Sept. 4, 2024, 2:52 p.m. UTC 
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: Ricky WU <ricky_wu@realtek.com>
Signed-off-by: Avri Altman <avri.altman@wdc.com>
---
 drivers/mmc/core/sd_ops.c | 16 ++++++++++++++++
 drivers/mmc/core/sd_ops.h |  1 +
 include/linux/mmc/sd.h    |  3 +++
 3 files changed, 20 insertions(+)
diff mbox series

Patch

diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
index 8b9b34286ef3..4397e5e06dd8 100644
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -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 +189,21 @@  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);
+}
+EXPORT_SYMBOL_GPL(mmc_send_ext_addr);
+
 static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8 pcie_bits,
 			      u32 *resp)
 {
diff --git a/drivers/mmc/core/sd_ops.h b/drivers/mmc/core/sd_ops.h
index 7667fc223b74..fd3f10b9cf86 100644
--- a/drivers/mmc/core/sd_ops.h
+++ b/drivers/mmc/core/sd_ops.h
@@ -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
 
diff --git a/include/linux/mmc/sd.h b/include/linux/mmc/sd.h
index 865cc0ca8543..af5fc70e09a2 100644
--- a/include/linux/mmc/sd.h
+++ b/include/linux/mmc/sd.h
@@ -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  */