ENGR00133884 eMMC: improve boot_info message output

Output bit means of important esd_csd register

Read esd_csd info each time when cat boot_info
becasue user may change config affect esd_csd
value.

boot_info:0x07;
  ALT_BOOT_MODE:1 - Supports alternate boot method
  DDR_BOOT_MODE:1 - Supports alternate dual data rate during boot
  HS_BOOTMODE:1 - Supports high speed timing during boot
boot_size:0512KB
  boot_partition:0x48;
  BOOT_ACK:1 - Boot acknowledge sent during boot operation
  BOOT_PARTITION-ENABLE: 1 - Boot partition 1 enabled
  PARTITION_ACCESS:0 - No access to boot partition
boot_bus:0x01
  BOOT_MODE:0 - Use single data rate + backward compatible timings
in boot operation
  RESET_BOOT_BUS_WIDTH:0 - Reset bus width to x1, single data rate
and backward compatible timings after boot operation
  BOOT_BUS_WIDTH:1 - x4 (sdr/ddr) bus width in boot operation mode

Signed-off-by: Frank Li <Frank.Li@freescale.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 6af789fd6ed5..c627c372cefb 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -791,8 +791,114 @@ 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);
+
+static ssize_t mmc_boot_info_show(struct device *dev,
+			struct device_attribute *attr, char *buf)
+{
+	char *boot_partition[8] = {
+		"Device not boot enabled",
+		"Boot partition 1 enabled",
+		"Boot partition 2 enabled",
+		"Reserved",
+		"Reserved",
+		"Reserved",
+		"Reserved",
+		"User area enabled for boot"};
+
+	char *boot_partition_access[8] = {
+		"No access to boot partition",
+		"R/W boot partition 1",
+		"R/W boot partition 2",
+		"R/W Replay Protected Memory Block (RPMB)",
+		"Access to General Purpose partition 1",
+		"Access to General Purpose partition 2",
+		"Access to General Purpose partition 3",
+		"Access to General Purpose partition 4"};
+
+	char *bus_width[4] = {
+		"x1 (sdr) or x4 (ddr) bus width in boot operation mode",
+		"x4 (sdr/ddr) bus width in boot operation mode",
+		"x8 (sdr/ddr) bus width in boot operation mode",
+		"Reserved"};
+
+	char *boot_mode[4] = {
+	"Use single data rate + backward compatible timings in boot operation",
+	"Use single data rate + high speed timings in boot operation mode",
+	"Use dual data rate in boot operation",
+	"Reserved"};
+
+	int partition;
+	int access;
+	int width;
+	int mode;
+	struct mmc_card *card = container_of(dev, struct mmc_card, dev);
+
+	/* read it again because user may change it */
+	mmc_claim_host(card->host);
+	mmc_read_ext_csd(card);
+	mmc_release_host(card->host);
+
+	partition = (card->ext_csd.boot_config >> 3) & 0x7;
+	access = card->ext_csd.boot_config & 0x7;
+	width =  card->ext_csd.boot_bus_width & 0x3;
+	mode = (card->ext_csd.boot_bus_width >> 3) & 0x3;
+
+	return sprintf(buf,
+		"boot_info:0x%02x;\n"
+		"  ALT_BOOT_MODE:%x - %s\n"
+		"  DDR_BOOT_MODE:%x - %s\n"
+		"  HS_BOOTMODE:%x - %s\n"
+		"boot_size:%04dKB\n"
+		"boot_partition:0x%02x;\n"
+		"  BOOT_ACK:%x - %s\n"
+		"  BOOT_PARTITION-ENABLE: %x - %s\n"
+		"  PARTITION_ACCESS:%x - %s\n"
+		"boot_bus:0x%02x\n"
+		"  BOOT_MODE:%x - %s\n"
+		"  RESET_BOOT_BUS_WIDTH:%x - %s\n"
+		"  BOOT_BUS_WIDTH:%x - %s\n",
+
+		card->ext_csd.boot_info,
+		!!(card->ext_csd.boot_info & 0x1),
+		(card->ext_csd.boot_info & 0x1) ?
+			"Supports alternate boot method" :
+			"Does not support alternate boot method",
+		!!(card->ext_csd.boot_info & 0x2),
+		(card->ext_csd.boot_info & 0x2) ?
+			"Supports alternate dual data rate during boot" :
+			"Does not support dual data rate during boot",
+		!!(card->ext_csd.boot_info & 0x4),
+		(card->ext_csd.boot_info & 0x4) ?
+			"Supports high speed timing during boot" :
+			"Does not support high speed timing during boot",
+
+		card->ext_csd.boot_size_mult * 128,
+
+		card->ext_csd.boot_config,
+		!!(card->ext_csd.boot_config & 0x40),
+		(card->ext_csd.boot_config & 0x40) ?
+			"Boot acknowledge sent during boot operation" :
+			"No boot acknowledge sent",
+		partition,
+		boot_partition[partition],
+		access,
+		boot_partition_access[access],
+
+		card->ext_csd.boot_bus_width,
+		mode,
+		boot_mode[mode],
+		!!(card->ext_csd.boot_bus_width & 0x4),
+		(card->ext_csd.boot_bus_width & 0x4) ?
+		  "Retain boot bus width and boot mode after boot operation" :
+		  "Reset bus width to x1, single data rate and backward"
+		  "compatible timings after boot operation",
+		width,
+		bus_width[width]);
+}
+
 DEVICE_ATTR(boot_config, S_IWUGO, NULL, setup_boot_partitions);
 DEVICE_ATTR(boot_bus_config, S_IWUGO, NULL, setup_boot_bus);
+DEVICE_ATTR(boot_info, S_IRUGO, mmc_boot_info_show, NULL);
 
 static struct attribute *mmc_std_attrs[] = {
 	&dev_attr_cid.attr,