[U-Boot] [PATCH v2 14/18] mmc: add API to do eMMC hardware partitioning
Diego Santa Cruz
Diego.SantaCruz at spinetix.com
Thu Dec 4 18:02:11 CET 2014
This adds an API to do hardware partitioning on eMMC devices. The
new mmc_hwpart_config() function does the partitioning in one go.
As the different attributes and partitioning options on eMMC may
be interdependent validation has to be done based on the complete
partitioning configuration. The function accepts three modes:
- MMC_HWPART_CONF_CHECK: just validates that the configuration
is valid.
- MMC_HWPART_CONF_SET: validates and sets all the fields in
EXT_CSD but without setting the "partitioning completed" bit,
and thus is reversible.
- MMC_HWPART_CONF_COMPLETE: does everything and is thus not
reversible.
---
drivers/mmc/mmc.c | 154 +++++++++++++++++++++++++++++++++++++++++++++++++++++
include/mmc.h | 20 +++++++
2 files changed, 174 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 8f6cbd5..4cd49eb 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -605,6 +605,160 @@ int mmc_switch_part(int dev_num, unsigned int part_num)
return ret;
}
+int mmc_hwpart_config(struct mmc *mmc,
+ const struct mmc_hwpart_conf *conf,
+ enum mmc_hwpart_conf_mode mode)
+{
+ u8 part_attrs = 0;
+ u32 enh_size_mult;
+ u32 enh_start_addr;
+ u32 gp_size_mult[4];
+ u32 max_enh_size_mult;
+ u32 tot_enh_size_mult = 0;
+ int i, pidx, err;
+ ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);
+
+ if (mode < MMC_HWPART_CONF_CHECK || mode > MMC_HWPART_CONF_COMPLETE)
+ return -EINVAL;
+
+ if (IS_SD(mmc) || (mmc->version < MMC_VERSION_4_41)) {
+ printf("eMMC >= 4.4 required for enhanced user data area\n");
+ return -EMEDIUMTYPE;
+ }
+
+ if ( ! (mmc->part_support & PART_SUPPORT) ) {
+ printf("Card does not support partitioning\n");
+ return -EMEDIUMTYPE;
+ }
+
+ if ( ! mmc->hc_wp_grp_size ) {
+ printf("Card does not define HC WP group size\n");
+ return -EMEDIUMTYPE;
+ }
+
+ /* check partition alignment and total enhanced size */
+ if (conf->user.enh_size) {
+ if (conf->user.enh_size % mmc->hc_wp_grp_size ||
+ conf->user.enh_start % mmc->hc_wp_grp_size) {
+ printf("User data enhanced area not HC WP group "
+ "size aligned\n");
+ return -EINVAL;
+ }
+ part_attrs |= EXT_CSD_ENH_USR;
+ enh_size_mult = conf->user.enh_size / mmc->hc_wp_grp_size;
+ if (mmc->high_capacity) {
+ enh_start_addr = conf->user.enh_start;
+ } else {
+ enh_start_addr = (conf->user.enh_start << 9);
+ }
+ } else {
+ enh_size_mult = 0;
+ enh_start_addr = 0;
+ }
+ tot_enh_size_mult += enh_size_mult;
+
+ for (pidx = 0; pidx < 4; pidx++) {
+ if (conf->gp_part[pidx].size % mmc->hc_wp_grp_size) {
+ printf("GP%i partition not HC WP group size "
+ "aligned\n", pidx+1);
+ return -EINVAL;
+ }
+ gp_size_mult[pidx] = conf->gp_part[pidx].size / mmc->hc_wp_grp_size;
+ if (conf->gp_part[pidx].size && conf->gp_part[pidx].enhanced) {
+ part_attrs |= EXT_CSD_ENH_GP(pidx);
+ tot_enh_size_mult += gp_size_mult[pidx];
+ }
+ }
+
+ if (part_attrs && ! (mmc->part_support & ENHNCD_SUPPORT)) {
+ printf("Card does not support enhanced attribute\n");
+ return -EMEDIUMTYPE;
+ }
+
+ err = mmc_send_ext_csd(mmc, ext_csd);
+ if (err)
+ return err;
+
+ max_enh_size_mult =
+ (ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT+2] << 16) +
+ (ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT+1] << 8) +
+ ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT];
+ if (tot_enh_size_mult > max_enh_size_mult) {
+ printf("Total enhanced size exceeds maximum (%u > %u)\n",
+ tot_enh_size_mult, max_enh_size_mult);
+ return -EMEDIUMTYPE;
+ }
+
+ if (ext_csd[EXT_CSD_PART_SETTING_COMPLETED] & PART_SETTING_COMPLETED) {
+ printf("Card already partitioned\n");
+ return -EPERM;
+ }
+
+ if (mode == MMC_HWPART_CONF_CHECK)
+ return 0;
+
+ /* Partitioning requires high-capacity size definitions */
+ if ( ! (ext_csd[EXT_CSD_ERASE_GROUP_DEF] & 0x01) ) {
+ err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_ERASE_GROUP_DEF, 1);
+
+ if (err)
+ return err;
+
+ ext_csd[EXT_CSD_ERASE_GROUP_DEF] = 1;
+
+ /* update erase group size to be high-capacity */
+ mmc->erase_grp_size =
+ ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] * 1024;
+
+ }
+
+ /* all OK, write the configuration */
+ for (i = 0; i < 4; i++) {
+ err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_ENH_START_ADDR+i,
+ (enh_start_addr >> (i*8)) & 0xFF);
+ if (err)
+ return err;
+ }
+ for (i = 0; i < 3; i++) {
+ err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_ENH_SIZE_MULT+i,
+ (enh_size_mult >> (i*8)) & 0xFF);
+ if (err)
+ return err;
+ }
+ for (pidx = 0; pidx < 4; pidx++) {
+ for (i = 0; i < 3; i++) {
+ err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_GP_SIZE_MULT+pidx*3+i,
+ (gp_size_mult[pidx] >> (i*8)) & 0xFF);
+ if (err)
+ return err;
+ }
+ }
+ err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_PARTITIONS_ATTRIBUTE, part_attrs);
+ if (err)
+ return err;
+
+ if (mode == MMC_HWPART_CONF_SET)
+ return 0;
+
+ /* Setting PART_SETTING_COMPLETED confirms the partition
+ * configuration but it only becomes effective after power
+ * cycle, so we do not adjust the partition related settings
+ * in the mmc struct. */
+
+ err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_PART_SETTING_COMPLETED,
+ PART_SETTING_COMPLETED);
+ if (err)
+ return err;
+
+ return 0;
+}
+
int mmc_getcd(struct mmc *mmc)
{
int cd;
diff --git a/include/mmc.h b/include/mmc.h
index bf08bec..b7db793 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -151,6 +151,7 @@
#define EXT_CSD_GP_SIZE_MULT 143 /* R/W */
#define EXT_CSD_PART_SETTING_COMPLETED 155 /* R/W */
#define EXT_CSD_PARTITIONS_ATTRIBUTE 156 /* R/W */
+#define EXT_CSD_MAX_ENH_SIZE_MULT 157 /* R */
#define EXT_CSD_PARTITIONING_SUPPORT 160 /* RO */
#define EXT_CSD_RST_N_FUNCTION 162 /* R/W */
#define EXT_CSD_RPMB_MULT 168 /* RO */
@@ -329,6 +330,23 @@ struct mmc {
uint op_cond_response; /* the response byte from the last op_cond */
};
+struct mmc_hwpart_conf {
+ struct {
+ uint enh_start; /* in 512-byte sectors */
+ uint enh_size; /* in 512-byte sectors, if 0 no enh area */
+ } user;
+ struct {
+ uint size; /* in 512-byte sectors */
+ int enhanced;
+ } gp_part[4];
+};
+
+enum mmc_hwpart_conf_mode {
+ MMC_HWPART_CONF_CHECK,
+ MMC_HWPART_CONF_SET,
+ MMC_HWPART_CONF_COMPLETE,
+};
+
int mmc_register(struct mmc *mmc);
struct mmc *mmc_create(const struct mmc_config *cfg, void *priv);
void mmc_destroy(struct mmc *mmc);
@@ -341,6 +359,8 @@ int mmc_set_dev(int dev_num);
void print_mmc_devices(char separator);
int get_mmc_num(void);
int mmc_switch_part(int dev_num, unsigned int part_num);
+int mmc_hwpart_config(struct mmc *mmc, const struct mmc_hwpart_conf *conf,
+ enum mmc_hwpart_conf_mode mode);
int mmc_getcd(struct mmc *mmc);
int board_mmc_getcd(struct mmc *mmc);
int mmc_getwp(struct mmc *mmc);
--
1.7.1
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