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mmc: Checks EXT_CSD_PARTITION_SETTING_COMPLETED before partitions computation 

Checks EXT_CSD_PARTITION_SETTING_COMPLETED bit before
 computing enhanced user area offset and size, and
 adding mmc general purpose partitions. The two needs
 EXT_CSD_PARTITION_SETTING_COMPLETED bit be set to be
 valid (as described in JEDEC standard).
Warn user in case of misconfiguration.

Signed-off-by: Grégory Soutadé <gsoutade@neotion.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Grégory Soutadé 2014-09-15 17:47:11 +02:00 committed by Ulf Hansson
parent 69803d4f48
commit 994324bbab
1 changed files with 44 additions and 37 deletions
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81
drivers/mmc/core/mmc.c
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@ -301,7 +301,13 @@ static void mmc_select_card_type(struct mmc_card *card)
static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
{
u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
u8 hc_erase_grp_sz, hc_wp_grp_sz;
/*
* Disable these attributes by default
*/
card->ext_csd.enhanced_area_offset = -EINVAL;
card->ext_csd.enhanced_area_size = -EINVAL;
/*
* Enhanced area feature support -- check whether the eMMC
@ -310,43 +316,41 @@ static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
*/
if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
(ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
hc_erase_grp_sz =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
hc_wp_grp_sz =
ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
if (card->ext_csd.partition_setting_completed) {
hc_erase_grp_sz =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
hc_wp_grp_sz =
ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
/*
* calculate the enhanced data area offset, in bytes
*/
card->ext_csd.enhanced_area_offset =
(ext_csd[139] << 24) + (ext_csd[138] << 16) +
(ext_csd[137] << 8) + ext_csd[136];
if (mmc_card_blockaddr(card))
card->ext_csd.enhanced_area_offset <<= 9;
/*
* calculate the enhanced data area size, in kilobytes
*/
card->ext_csd.enhanced_area_size =
(ext_csd[142] << 16) + (ext_csd[141] << 8) +
ext_csd[140];
card->ext_csd.enhanced_area_size *=
(size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
card->ext_csd.enhanced_area_size <<= 9;
} else {
/*
* If the enhanced area is not enabled, disable these
* device attributes.
*/
card->ext_csd.enhanced_area_offset = -EINVAL;
card->ext_csd.enhanced_area_size = -EINVAL;
/*
* calculate the enhanced data area offset, in bytes
*/
card->ext_csd.enhanced_area_offset =
(ext_csd[139] << 24) + (ext_csd[138] << 16) +
(ext_csd[137] << 8) + ext_csd[136];
if (mmc_card_blockaddr(card))
card->ext_csd.enhanced_area_offset <<= 9;
/*
* calculate the enhanced data area size, in kilobytes
*/
card->ext_csd.enhanced_area_size =
(ext_csd[142] << 16) + (ext_csd[141] << 8) +
ext_csd[140];
card->ext_csd.enhanced_area_size *=
(size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
card->ext_csd.enhanced_area_size <<= 9;
} else {
pr_warn("%s: defines enhanced area without partition setting complete\n",
mmc_hostname(card->host));
}
}
}
static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
{
unsigned int part_size;
u8 hc_erase_grp_sz = 0, hc_wp_grp_sz = 0;
int idx;
u8 hc_erase_grp_sz, hc_wp_grp_sz;
unsigned int part_size;
/*
* General purpose partition feature support --
@ -355,18 +359,21 @@ static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
*/
if (ext_csd[EXT_CSD_PARTITION_SUPPORT] &
EXT_CSD_PART_SUPPORT_PART_EN) {
if (card->ext_csd.partition_setting_completed) {
hc_erase_grp_sz =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
hc_wp_grp_sz =
ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
}
hc_erase_grp_sz =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
hc_wp_grp_sz =
ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
for (idx = 0; idx < MMC_NUM_GP_PARTITION; idx++) {
if (!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3] &&
!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1] &&
!ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2])
continue;
if (card->ext_csd.partition_setting_completed == 0) {
pr_warn("%s: has partition size defined without partition complete\n",
mmc_hostname(card->host));
break;
}
part_size =
(ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 2]
<< 16) +