MMC: APIs to support resize of EMMC boot partition

This patch adds APIs to access(open / close) and to resize boot partiton of EMMC.

Signed-off-by: Amar <amarendra.xt@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

drivers/mmc/mmc.c

@@ -1374,3 +1374,137 @@ int mmc_initialize(bd_t *bis)
 
 	return 0;
 }
+
+#ifdef CONFIG_SUPPORT_EMMC_BOOT
+/*
+ * This function changes the size of boot partition and the size of rpmb
+ * partition present on EMMC devices.
+ *
+ * Input Parameters:
+ * struct *mmc: pointer for the mmc device strcuture
+ * bootsize: size of boot partition
+ * rpmbsize: size of rpmb partition
+ *
+ * Returns 0 on success.
+ */
+
+int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
+				unsigned long rpmbsize)
+{
+	int err;
+	struct mmc_cmd cmd;
+
+	/* Only use this command for raw EMMC moviNAND. Enter backdoor mode */
+	cmd.cmdidx = MMC_CMD_RES_MAN;
+	cmd.resp_type = MMC_RSP_R1b;
+	cmd.cmdarg = MMC_CMD62_ARG1;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+	if (err) {
+		debug("mmc_boot_partition_size_change: Error1 = %d\n", err);
+		return err;
+	}
+
+	/* Boot partition changing mode */
+	cmd.cmdidx = MMC_CMD_RES_MAN;
+	cmd.resp_type = MMC_RSP_R1b;
+	cmd.cmdarg = MMC_CMD62_ARG2;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+	if (err) {
+		debug("mmc_boot_partition_size_change: Error2 = %d\n", err);
+		return err;
+	}
+	/* boot partition size is multiple of 128KB */
+	bootsize = (bootsize * 1024) / 128;
+
+	/* Arg: boot partition size */
+	cmd.cmdidx = MMC_CMD_RES_MAN;
+	cmd.resp_type = MMC_RSP_R1b;
+	cmd.cmdarg = bootsize;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+	if (err) {
+		debug("mmc_boot_partition_size_change: Error3 = %d\n", err);
+		return err;
+	}
+	/* RPMB partition size is multiple of 128KB */
+	rpmbsize = (rpmbsize * 1024) / 128;
+	/* Arg: RPMB partition size */
+	cmd.cmdidx = MMC_CMD_RES_MAN;
+	cmd.resp_type = MMC_RSP_R1b;
+	cmd.cmdarg = rpmbsize;
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+	if (err) {
+		debug("mmc_boot_partition_size_change: Error4 = %d\n", err);
+		return err;
+	}
+	return 0;
+}
+
+/*
+ * This function shall form and send the commands to open / close the
+ * boot partition specified by user.
+ *
+ * Input Parameters:
+ * ack: 0x0 - No boot acknowledge sent (default)
+ *	0x1 - Boot acknowledge sent during boot operation
+ * part_num: User selects boot data that will be sent to master
+ *	0x0 - Device not boot enabled (default)
+ *	0x1 - Boot partition 1 enabled for boot
+ *	0x2 - Boot partition 2 enabled for boot
+ * access: User selects partitions to access
+ *	0x0 : No access to boot partition (default)
+ *	0x1 : R/W boot partition 1
+ *	0x2 : R/W boot partition 2
+ *	0x3 : R/W Replay Protected Memory Block (RPMB)
+ *
+ * Returns 0 on success.
+ */
+int mmc_boot_part_access(struct mmc *mmc, u8 ack, u8 part_num, u8 access)
+{
+	int err;
+	struct mmc_cmd cmd;
+
+	/* Boot ack enable, boot partition enable , boot partition access */
+	cmd.cmdidx = MMC_CMD_SWITCH;
+	cmd.resp_type = MMC_RSP_R1b;
+
+	cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
+			(EXT_CSD_PART_CONF << 16) |
+			((EXT_CSD_BOOT_ACK(ack) |
+			EXT_CSD_BOOT_PART_NUM(part_num) |
+			EXT_CSD_PARTITION_ACCESS(access)) << 8);
+
+	err = mmc_send_cmd(mmc, &cmd, NULL);
+	if (err) {
+		if (access) {
+			debug("mmc boot partition#%d open fail:Error1 = %d\n",
+			      part_num, err);
+		} else {
+			debug("mmc boot partition#%d close fail:Error = %d\n",
+			      part_num, err);
+		}
+		return err;
+	}
+
+	if (access) {
+		/* 4bit transfer mode at booting time. */
+		cmd.cmdidx = MMC_CMD_SWITCH;
+		cmd.resp_type = MMC_RSP_R1b;
+
+		cmd.cmdarg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
+				(EXT_CSD_BOOT_BUS_WIDTH << 16) |
+				((1 << 0) << 8);
+
+		err = mmc_send_cmd(mmc, &cmd, NULL);
+		if (err) {
+			debug("mmc boot partition#%d open fail:Error2 = %d\n",
+			      part_num, err);
+			return err;
+		}
+	}
+	return 0;
+}
+#endif

include/mmc.h

@@ -92,6 +92,11 @@
 #define MMC_CMD_APP_CMD			55
 #define MMC_CMD_SPI_READ_OCR		58
 #define MMC_CMD_SPI_CRC_ON_OFF		59
+#define MMC_CMD_RES_MAN			62
+
+#define MMC_CMD62_ARG1			0xefac62ec
+#define MMC_CMD62_ARG2			0xcbaea7
+
 
 #define SD_CMD_SEND_RELATIVE_ADDR	3
 #define SD_CMD_SWITCH_FUNC		6
@@ -159,6 +164,7 @@
  */
 #define EXT_CSD_PARTITIONING_SUPPORT	160	/* RO */
 #define EXT_CSD_ERASE_GROUP_DEF		175	/* R/W */
+#define EXT_CSD_BOOT_BUS_WIDTH		177
 #define EXT_CSD_PART_CONF		179	/* R/W */
 #define EXT_CSD_BUS_WIDTH		183	/* R/W */
 #define EXT_CSD_HS_TIMING		185	/* R/W */
@@ -183,6 +189,16 @@
 #define EXT_CSD_BUS_WIDTH_4	1	/* Card is in 4 bit mode */
 #define EXT_CSD_BUS_WIDTH_8	2	/* Card is in 8 bit mode */
 
+#define EXT_CSD_BOOT_ACK_ENABLE			(1 << 6)
+#define EXT_CSD_BOOT_PARTITION_ENABLE		(1 << 3)
+#define EXT_CSD_PARTITION_ACCESS_ENABLE		(1 << 0)
+#define EXT_CSD_PARTITION_ACCESS_DISABLE	(0 << 0)
+
+#define EXT_CSD_BOOT_ACK(x)		(x << 6)
+#define EXT_CSD_BOOT_PART_NUM(x)	(x << 3)
+#define EXT_CSD_PARTITION_ACCESS(x)	(x << 0)
+
+
 #define R1_ILLEGAL_COMMAND		(1 << 22)
 #define R1_APP_CMD			(1 << 5)
 
@@ -210,6 +226,11 @@
 /* Maximum block size for MMC */
 #define MMC_MAX_BLOCK_LEN	512
 
+/* The number of MMC physical partitions.  These consist of:
+ * boot partitions (2), general purpose partitions (4) in MMC v4.4.
+ */
+#define MMC_NUM_BOOT_PARTITION	2
+
 struct mmc_cid {
 	unsigned long psn;
 	unsigned short oid;
@@ -286,6 +307,11 @@ int mmc_switch_part(int dev_num, unsigned int part_num);
 int mmc_getcd(struct mmc *mmc);
 int mmc_getwp(struct mmc *mmc);
 void spl_mmc_load(void) __noreturn;
+/* Function to change the size of boot partition and rpmb partitions */
+int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
+					unsigned long rpmbsize);
+/* Function to send commands to open/close the specified boot partition */
+int mmc_boot_part_access(struct mmc *mmc, u8 ack, u8 part_num, u8 access);
 
 #ifdef CONFIG_GENERIC_MMC
 #define mmc_host_is_spi(mmc)	((mmc)->host_caps & MMC_MODE_SPI)