ENGR00125411 eMMC: Boot Partition switch func used in MFG tool

User can get eMMC partitions info from user space layer in
linux OS enviroment.
User can do switch operations between the eMMC boot partitions
and the user partition.
User can access the eMMC boot partitions from user space layer
in linux OS enviroment.
NOTE:This func had been verified on TOSHIBA eMMC44 card only.

Signed-off-by: Richard Zhu <r65037@freescale.com>
Signed-off-by: Rob Herring <r.herring@freescale.com>

3 files changed, 118 insertions, 0 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 20b42c835ab3..f53aa48b7100 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -281,7 +281,14 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 		if (card->ext_csd.sectors > (2u * 1024 * 1024 * 1024) / 512)
 			mmc_card_set_blockaddr(card);
 	}
+
 	card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
+
+	card->ext_csd.boot_info = ext_csd[EXT_CSD_BOOT_INFO];
+	card->ext_csd.boot_size_mult = ext_csd[EXT_CSD_BOOT_SIZE_MULT];
+	card->ext_csd.boot_config = ext_csd[EXT_CSD_BOOT_CONFIG];
+	card->ext_csd.card_type = ext_csd[EXT_CSD_CARD_TYPE];
+
 	switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
 	case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
 	     EXT_CSD_CARD_TYPE_26:
@@ -484,6 +491,102 @@ out:
 	return err;
 }
 
+/* switch the partitions */
+static ssize_t
+switch_partitions(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	int err;
+	u32 part, new_part;
+	u8 *ext_csd, boot_config;
+	struct mmc_card *card = container_of(dev, struct mmc_card, dev);
+	struct mmc_host *host = card->host;
+
+	BUG_ON(!card);
+
+	mmc_claim_host(card->host);
+	sscanf(buf, "%d\n", &part);
+
+	/* partition must be -
+	 * 0 - user area
+	 * 1 - boot partition 1
+	 * 2 - boot partition 2
+	 */
+	if (part > 2) {
+		printk(KERN_ERR "%s: wrong partition id"
+			" 0 (user area), 1 (boot1), 2 (boot2)\n",
+			mmc_hostname(card->host));
+		return -EINVAL;
+	}
+
+	if (card->csd.mmca_vsn < CSD_SPEC_VER_4) {
+		printk(KERN_ERR "%s: invalid mmc version"
+			" mmc version is below version 4!)\n",
+			mmc_hostname(card->host));
+		return -EINVAL;
+	}
+
+	/* it's a normal SD/MMC but user request to configure boot partition */
+	if (card->ext_csd.boot_size_mult <= 0) {
+		printk(KERN_ERR "%s: this is a normal SD/MMC card"
+			" but you request to access boot partition!\n",
+			mmc_hostname(card->host));
+		return -EINVAL;
+	}
+
+	ext_csd = kmalloc(512, GFP_KERNEL);
+	if (!ext_csd) {
+		printk(KERN_ERR "%s: could not allocate a buffer to "
+			"receive the ext_csd.\n", mmc_hostname(card->host));
+		return -ENOMEM;
+	}
+
+	err = mmc_send_ext_csd(card, ext_csd);
+	if (err) {
+		printk(KERN_ERR "%s: unable to read EXT_CSD.\n",
+			mmc_hostname(card->host));
+		goto err_rtn;
+	}
+
+	/* Send SWITCH command to change partition for access */
+	boot_config = (ext_csd[EXT_CSD_BOOT_CONFIG] &
+			~EXT_CSD_BOOT_PARTITION_ACCESS_MASK) | part;
+	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			EXT_CSD_BOOT_CONFIG, boot_config);
+	if (err) {
+		printk(KERN_ERR "%s: fail to send SWITCH command"
+				" to card to swich partition for access!\n",
+			mmc_hostname(card->host));
+		goto err_rtn;
+	}
+
+	/* Now check whether it works */
+	err = mmc_send_ext_csd(card, ext_csd);
+	if (err) {
+		printk(KERN_ERR "%s: %d unable to read EXT_CSD.\n",
+			mmc_hostname(card->host), err);
+		goto err_rtn;
+	}
+
+	new_part = ext_csd[EXT_CSD_BOOT_CONFIG] &
+		EXT_CSD_BOOT_PARTITION_ACCESS_MASK;
+	if (part != new_part) {
+		printk(KERN_ERR "%s: after SWITCH, current part id %d is not"
+				" same as requested partition %d!\n",
+			mmc_hostname(card->host), new_part, part);
+		goto err_rtn;
+	}
+	card->ext_csd.boot_config = ext_csd[EXT_CSD_BOOT_CONFIG];
+
+err_rtn:
+	mmc_release_host(card->host);
+	kfree(ext_csd);
+	if (err)
+		return err;
+	else
+		return count;
+}
+
 MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 	card->raw_cid[2], card->raw_cid[3]);
 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
@@ -500,6 +603,10 @@ MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
 MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
 		card->ext_csd.enhanced_area_offset);
 MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
+MMC_DEV_ATTR(boot_info, "Info:0x%02x;Size:0x%02xMB;Part:0x%02x\n",
+	card->ext_csd.boot_info, card->ext_csd.boot_size_mult / 8,
+	card->ext_csd.boot_config);
+DEVICE_ATTR(boot_config, S_IWUGO, NULL, switch_partitions);
 
 static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_cid.attr,
@@ -515,6 +622,8 @@ static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_serial.attr,
 	&dev_attr_enhanced_area_offset.attr,
 	&dev_attr_enhanced_area_size.attr,
+	&dev_attr_boot_info.attr,
+	&dev_attr_boot_config.attr,
 	NULL,
 };
 
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 6ad43554ac05..a7aff5c74c0b 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -77,6 +77,10 @@ struct mmc_ext_csd {
 	u8			raw_sec_feature_support;/* 231 */
 	u8			raw_trim_mult;		/* 232 */
 	u8			raw_sectors[4];		/* 212 - 4 bytes */
+#define MMC_DDR_MODE_MASK 	(0x3<<2)
+	unsigned char		boot_info;
+	unsigned char		boot_size_mult;
+	unsigned char		boot_config;
 };
 
 struct sd_scr {
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index ac26a685cca8..fe1da341e28d 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -283,6 +283,9 @@ struct _mmc_csd {
 #define EXT_CSD_SEC_ERASE_MULT		230	/* RO */
 #define EXT_CSD_SEC_FEATURE_SUPPORT	231	/* RO */
 #define EXT_CSD_TRIM_MULT		232	/* RO */
+#define EXT_CSD_BOOT_CONFIG 		179	/* R/W */
+#define EXT_CSD_BOOT_SIZE_MULT		226	/* RO, 1 bytes */
+#define EXT_CSD_BOOT_INFO		228	/* RO, 1 bytes */
 
 /*
  * EXT_CSD field definitions
@@ -318,6 +321,8 @@ struct _mmc_csd {
 #define EXT_CSD_SEC_BD_BLK_EN	BIT(2)
 #define EXT_CSD_SEC_GB_CL_EN	BIT(4)
 
+#define EXT_CSD_BOOT_PARTITION_ACCESS_MASK      (0x3)
+
 /*
  * MMC_SWITCH access modes
  */