ENGR00126228 eMMC: Configure boot_partition_enable

Enable the configurations of the boot enable on the eMMC cards.

Add the interface that used to configure the boot_bus_width

In order to make sure that the re-read the ext-csd of card
can be completed successfully, add the method to wait for
the finish of the busy state.

NOTE:
The following are the valid inputs when configure the boot
bus width of the eMMC cards.
+--------------------------------------------------------------------+
| Bit7 Bit6 Bit5 | Bit4 Bit3 | Bit2                 | Bit1 Bit0      |
|----------------|----------------------------------|----------------|
| X              | BOOT_MODE | RESET_BOOT_BUS_WIDTH | BOOT_BUS_WIDTH |
+--------------------------------------------------------------------+
Bit [4:3] : BOOT_MODE (non-volatile)
0x0 : Use single data rate + backward compatible timings in boot
operation (default)
0x1 : Use single data rate + high speed timings in boot operation mode
0x2 : Use dual data rate in boot operation
0x3 : Reserved
Bit [2]: RESET_BOOT_BUS_WIDTH (non-volatile)
0x0 : Reset bus width to x1, single data rate and backward compatible
timings after boot operation (default)
0x1 : Retain boot bus width and boot mode after boot operation
Bit[1:0] : BOOT_BUS_WIDTH (non-volatile)
0x0 : x1 (sdr) or x4 (ddr) bus width in boot operation mode (default)
0x1 : x4 (sdr/ddr) bus width in boot operation mode
0x2 : x8 (sdr/ddr) bus width in boot operation mode
0x3 : Reserved

The following are the valid inputs when configure the boot
partitions of the eMMC cards.
+------------------------------------------------------------+
| Bit7 | Bit6     | Bit5 Bit4 Bit3        | Bit2 Bit1 Bit0   |
|------|----------|-----------------------|------------------|
| X    | BOOT_ACK | BOOT_PARTITION_ENABLE | PARTITION_ACCESS |
+------------------------------------------------------------+
Bit7: Reserved
Bit6: always set to vaule '1' when boot_part is enabled
Bit[5:3]:
0x0 : Device not boot enabled (default)
0x1 : Boot partition 1 enabled for boot
0x2 : Boot partition 2 enabled for boot
0x7 : User area enabled for boot
Bit[2:0]:
0x0 : No access to boot partition (default)
0x1 : R/W boot partition 1
0x2 : R/W boot partition 2
So only the '0, 1, 2; 8, 9, 10; 16, 17, 18; 56, 57, 58' are
valid parameters when configure the boot_partiton.

Signed-off-by: Richard Zhu <r65037@freescale.com>

1 files changed, 208 insertions, 21 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index acb2e41bfeb0..4833d4bc268d 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -287,6 +287,7 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
 	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.boot_bus_width = ext_csd[EXT_CSD_BOOT_BUS_WIDTH];
 	card->ext_csd.card_type = ext_csd[EXT_CSD_CARD_TYPE];
 
 	switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
@@ -491,34 +492,21 @@ out:
 	return err;
 }
 
-/* switch the partitions */
+/* configure the boot partitions */
 static ssize_t
-switch_partitions(struct device *dev, struct device_attribute *attr,
+setup_boot_partitions(struct device *dev, struct device_attribute *attr,
 		const char *buf, size_t count)
 {
-	int err;
+	int err, busy = 0;
 	u32 part, new_part;
 	u8 *ext_csd, boot_config;
+	struct mmc_command cmd;
 	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",
@@ -541,6 +529,7 @@ switch_partitions(struct device *dev, struct device_attribute *attr,
 		return -ENOMEM;
 	}
 
+	mmc_claim_host(card->host);
 	err = mmc_send_ext_csd(card, ext_csd);
 	if (err) {
 		printk(KERN_ERR "%s: unable to read EXT_CSD.\n",
@@ -548,9 +537,62 @@ switch_partitions(struct device *dev, struct device_attribute *attr,
 		goto err_rtn;
 	}
 
+	/* enable the boot partition in boot mode */
+	/* boot enable be -
+	 * 0x00 - disable boot enable.
+	 * 0x08 - boot partition 1 is enabled for boot.
+	 * 0x10 - boot partition 2 is enabled for boot.
+	 * 0x38 - User area is enabled for boot.
+	 */
+	switch (part & EXT_CSD_BOOT_PARTITION_ENABLE_MASK) {
+	case 0:
+		boot_config = (ext_csd[EXT_CSD_BOOT_CONFIG]
+				& ~EXT_CSD_BOOT_PARTITION_ENABLE_MASK
+				& ~EXT_CSD_BOOT_ACK_ENABLE);
+		break;
+	case EXT_CSD_BOOT_PARTITION_PART1:
+		boot_config = ((ext_csd[EXT_CSD_BOOT_CONFIG]
+				& ~EXT_CSD_BOOT_PARTITION_ENABLE_MASK)
+				| EXT_CSD_BOOT_PARTITION_PART1
+				| EXT_CSD_BOOT_ACK_ENABLE);
+		break;
+	case EXT_CSD_BOOT_PARTITION_PART2:
+		boot_config = ((ext_csd[EXT_CSD_BOOT_CONFIG]
+				& ~EXT_CSD_BOOT_PARTITION_ENABLE_MASK)
+				| EXT_CSD_BOOT_PARTITION_PART2
+				| EXT_CSD_BOOT_ACK_ENABLE);
+		break;
+	case EXT_CSD_BOOT_PARTITION_ENABLE_MASK:
+		boot_config = ((ext_csd[EXT_CSD_BOOT_CONFIG]
+				| EXT_CSD_BOOT_PARTITION_ENABLE_MASK)
+				& ~EXT_CSD_BOOT_ACK_ENABLE);
+		break;
+	default:
+		printk(KERN_ERR "%s: wrong boot config parameter"
+			" 00 (disable boot), 08 (enable boot1),"
+			"16 (enable boot2), 56 (User area)\n",
+			mmc_hostname(card->host));
+		err = -EINVAL;
+		goto err_rtn;
+	}
+
+	/* switch the partitions that used to be accessed in OS layer */
+	/* partition must be -
+	 * 0 - user area
+	 * 1 - boot partition 1
+	 * 2 - boot partition 2
+	 */
+	if ((part & EXT_CSD_BOOT_PARTITION_ACCESS_MASK) > 2) {
+		printk(KERN_ERR "%s: wrong partition id"
+			" 0 (user area), 1 (boot1), 2 (boot2)\n",
+			mmc_hostname(card->host));
+		err = -EINVAL;
+		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;
+	boot_config &= ~EXT_CSD_BOOT_PARTITION_ACCESS_MASK;
+	boot_config |= (part & EXT_CSD_BOOT_PARTITION_ACCESS_MASK);
 	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 			EXT_CSD_BOOT_CONFIG, boot_config);
 	if (err) {
@@ -560,17 +602,41 @@ switch_partitions(struct device *dev, struct device_attribute *attr,
 		goto err_rtn;
 	}
 
+	/* waiting for the card to finish the busy state */
+	do {
+		memset(&cmd, 0, sizeof(struct mmc_command));
+
+		cmd.opcode = MMC_SEND_STATUS;
+		cmd.arg = card->rca << 16;
+		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+		err = mmc_wait_for_cmd(card->host, &cmd, 0);
+		if (err || busy > 100) {
+			printk(KERN_ERR "%s: failed to wait for"
+				"the busy state to end.\n",
+				mmc_hostname(card->host));
+			break;
+		}
+
+		if (!busy && !(cmd.resp[0] & R1_READY_FOR_DATA)) {
+			printk(KERN_INFO "%s: card is in busy state"
+				"pls wait for busy state to end.\n",
+				mmc_hostname(card->host));
+		}
+		busy++;
+	} while (!(cmd.resp[0] & R1_READY_FOR_DATA));
+
 	/* 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",
+		printk(KERN_ERR "%s: %d unable to re-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) {
+	if ((part & EXT_CSD_BOOT_PARTITION_ACCESS_MASK) != 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);
@@ -587,6 +653,120 @@ err_rtn:
 		return count;
 }
 
+/* configure the boot bus */
+static ssize_t
+setup_boot_bus(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	int err, busy = 0;
+	u32 boot_bus, new_bus;
+	u8 *ext_csd;
+	struct mmc_command cmd;
+	struct mmc_card *card = container_of(dev, struct mmc_card, dev);
+
+	BUG_ON(!card);
+
+	sscanf(buf, "%d\n", &boot_bus);
+
+	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 bus */
+	if (card->ext_csd.boot_size_mult <= 0) {
+		printk(KERN_ERR "%s: this is a normal SD/MMC card"
+			" but you request to configure boot bus !\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;
+	}
+
+	mmc_claim_host(card->host);
+	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;
+	}
+
+	/* Configure the boot bus width when boot partition is enabled */
+	if (((boot_bus & EXT_CSD_BOOT_BUS_WIDTH_MODE_MASK) >> 3) > 2
+			|| (boot_bus & EXT_CSD_BOOT_BUS_WIDTH_WIDTH_MASK) > 2
+			|| (boot_bus & ~EXT_CSD_BOOT_BUS_WIDTH_MASK) > 0) {
+		printk(KERN_ERR "%s: Invalid inputs!\n",
+			mmc_hostname(card->host));
+		err = -EINVAL;
+		goto err_rtn;
+	}
+
+	err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			EXT_CSD_BOOT_BUS_WIDTH, boot_bus);
+	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;
+	}
+
+	/* waiting for the card to finish the busy state */
+	do {
+		memset(&cmd, 0, sizeof(struct mmc_command));
+
+		cmd.opcode = MMC_SEND_STATUS;
+		cmd.arg = card->rca << 16;
+		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+
+		err = mmc_wait_for_cmd(card->host, &cmd, 0);
+		if (err || busy > 100) {
+			printk(KERN_ERR "%s: failed to wait for"
+				"the busy state to end.\n",
+				mmc_hostname(card->host));
+			break;
+		}
+
+		if (!busy && !(cmd.resp[0] & R1_READY_FOR_DATA)) {
+			printk(KERN_INFO "%s: card is in busy state"
+				"pls wait for busy state to end.\n",
+				mmc_hostname(card->host));
+		}
+		busy++;
+	} while (!(cmd.resp[0] & R1_READY_FOR_DATA));
+
+	/* Now check whether it works */
+	err = mmc_send_ext_csd(card, ext_csd);
+	if (err) {
+		printk(KERN_ERR "%s: %d unable to re-read EXT_CSD.\n",
+			mmc_hostname(card->host), err);
+		goto err_rtn;
+	}
+
+	new_bus = ext_csd[EXT_CSD_BOOT_BUS_WIDTH];
+	if (boot_bus  != new_bus) {
+		printk(KERN_ERR "%s: after SWITCH, current boot bus mode %d"
+				" is not same as requested bus mode %d!\n",
+			mmc_hostname(card->host), new_bus, boot_bus);
+		goto err_rtn;
+	}
+	card->ext_csd.boot_bus_width = ext_csd[EXT_CSD_BOOT_BUS_WIDTH];
+
+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],
@@ -607,6 +787,12 @@ 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);
+MMC_DEV_ATTR(boot_info, "boot_info:0x%02x; boot_size:%04dKB;"
+		" boot_partition:0x%02x; boot_bus:0x%02x\n",
+	card->ext_csd.boot_info, card->ext_csd.boot_size_mult * 128,
+	card->ext_csd.boot_config, card->ext_csd.boot_bus_width);
+DEVICE_ATTR(boot_config, S_IWUGO, NULL, setup_boot_partitions);
+DEVICE_ATTR(boot_bus_config, S_IWUGO, NULL, setup_boot_bus);
 
 static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_cid.attr,
@@ -624,6 +810,7 @@ static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_enhanced_area_size.attr,
 	&dev_attr_boot_info.attr,
 	&dev_attr_boot_config.attr,
+	&dev_attr_boot_bus_config.attr,
 	NULL,
 };