[U-Boot] [PATCH 16/18] mmc: extend the mmc hardware partitioning API with write reliability
Diego Santa Cruz
Diego.SantaCruz at spinetix.com
Fri Nov 28 11:57:41 CET 2014
Hi Pantelis,
> Hi Diego,
>
> At first glance it's OK, I'm not the turning of user_enh_start, _size to a
> structure
> has a lot of benefits. It makes the diff longer.
>
I did that so that all the user data area members can be easily reset to zero when parsing the mmc hwpartition sub-command arguments, in particular if any more members get added in the future, as it is easy to forget to add a reset to zero when adding a new member to the main structure. Keeping all of them in a sub-structure allows to just memset the sub-structure to zero and not worry about members that may get added in the future.
> > struct mmc_hwpart_conf {
> > - uint user_enh_start; /* in 512-byte sectors */
> > - uint user_enh_size; /* in 512-byte sectors, if 0 no enhanced user data
> */
> > + struct {
> > + uint enh_start; /* in 512-byte sectors */
> > + uint enh_size; /* in 512-byte sectors, if 0 no enhanced user
> data */
> > + unsigned wr_rel_change : 1;
> > + unsigned wr_rel_set : 1;
>
> How about user_wr_rel_change : 1; & wr_rel_set : 1;
>
> It will cut down on the diff size.
>
I am not sure I fully understand your comment. You mean not using a struct and just put them in the main struct with the user_ prefix?
Best,
Diego
--
Diego Santa Cruz, PhD
Technology Architect
spinetix.com
> -----Original Message-----
> From: Pantelis Antoniou [mailto:panto at antoniou-consulting.com]
> Sent: Friday, November 28, 2014 11:09 AM
> To: Diego Santa Cruz
> Cc: u-boot at lists.denx.de
> Subject: Re: [PATCH 16/18] mmc: extend the mmc hardware partitioning API with
> write reliability
>
> > On Nov 28, 2014, at 11:10 , Diego Santa Cruz <Diego.SantaCruz at spinetix.com>
> wrote:
> >
> > The eMMC partition write reliability settings are to be set while
> > partitioning a device, as per the eMMC spec, so changes to these
> > attributes needs to be done in the hardware partitioning API.
> > This commit adds such support.
> > ---
> > common/cmd_mmc.c | 21 +++++++++++----------
> > drivers/mmc/mmc.c | 51 +++++++++++++++++++++++++++++++++++++++++++++------
> > include/mmc.h | 19 ++++++++++++++++---
> > 3 files changed, 72 insertions(+), 19 deletions(-)
> >
> > diff --git a/common/cmd_mmc.c b/common/cmd_mmc.c
> > index 3943fb7..c0a4a3e 100644
> > --- a/common/cmd_mmc.c
> > +++ b/common/cmd_mmc.c
> > @@ -501,9 +501,10 @@ static int do_mmc_hwpartition(cmd_tbl_t *cmdtp, int
> flag,
> > if (!strcmp(argv[i], "userenh")) {
> > if (i + 2 >= argc)
> > return CMD_RET_USAGE;
> > - pconf.user_enh_start =
> > + memset(&pconf.user, 0, sizeof(pconf.user));
> > + pconf.user.enh_start =
> > simple_strtoul(argv[i+1], NULL, 10);
> > - pconf.user_enh_size =
> > + pconf.user.enh_size =
> > simple_strtoul(argv[i+2], NULL, 10);
> > i += 3;
> > } else if (!strncmp(argv[i], "gp", 2) &&
> > @@ -512,14 +513,14 @@ static int do_mmc_hwpartition(cmd_tbl_t *cmdtp, int
> flag,
> > if (i + 1 >= argc)
> > return CMD_RET_USAGE;
> > pidx = argv[i][2] - '1';
> > + memset(&pconf.gp_part[pidx], 0,
> > + sizeof(pconf.gp_part[pidx]));
> > pconf.gp_part[pidx].size =
> > simple_strtoul(argv[i+1], NULL, 10);
> > - if (i + 2 < argc && !strcmp(argv[i+2], "enh")) {
> > + i += 2;
> > + if (i < argc && !strcmp(argv[i], "enh")) {
> > pconf.gp_part[pidx].enhanced = 1;
> > - i += 3;
> > - } else {
> > - pconf.gp_part[pidx].enhanced = 0;
> > - i += 2;
> > + i++;
> > }
> > } else if (!strcmp(argv[i], "check")) {
> > mode = MMC_HWPART_CONF_CHECK;
> > @@ -536,11 +537,11 @@ static int do_mmc_hwpartition(cmd_tbl_t *cmdtp, int
> flag,
> > }
> >
> > puts("Partition configuration:\n");
> > - if (pconf.user_enh_size) {
> > + if (pconf.user.enh_size) {
> > puts("\tUser Enhanced Start: ");
> > - print_size(((u64)pconf.user_enh_start) << 9, "\n");
> > + print_size(((u64)pconf.user.enh_start) << 9, "\n");
> > puts("\tUser Enhanced Size: ");
> > - print_size(((u64)pconf.user_enh_size) << 9, "\n");
> > + print_size(((u64)pconf.user.enh_size) << 9, "\n");
> > } else {
> > puts("\tNo enhanced user data area\n");
> > }
> > diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
> > index 311097f..7cd21f2 100644
> > --- a/drivers/mmc/mmc.c
> > +++ b/drivers/mmc/mmc.c
> > @@ -615,6 +615,7 @@ int mmc_hwpart_config(struct mmc *mmc,
> > u32 gp_size_mult[4];
> > u32 max_enh_size_mult;
> > u32 tot_enh_size_mult = 0;
> > + u8 wr_rel_set;
> > int i, pidx, err;
> > ALLOC_CACHE_ALIGN_BUFFER(u8, ext_csd, MMC_MAX_BLOCK_LEN);
> >
> > @@ -637,19 +638,19 @@ int mmc_hwpart_config(struct mmc *mmc,
> > }
> >
> > /* 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) {
> > + 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;
> > + enh_size_mult = conf->user.enh_size / mmc->hc_wp_grp_size;
> > if (mmc->high_capacity) {
> > - enh_start_addr = conf->user_enh_start;
> > + enh_start_addr = conf->user.enh_start;
> > } else {
> > - enh_start_addr = (conf->user_enh_start << 9);
> > + enh_start_addr = (conf->user.enh_start << 9);
> > }
> > } else {
> > enh_size_mult = 0;
> > @@ -689,6 +690,33 @@ int mmc_hwpart_config(struct mmc *mmc,
> > return -EMEDIUMTYPE;
> > }
> >
> > + /* The default value of EXT_CSD_WR_REL_SET is device
> > + * dependent, the values can only be changed if the
> > + * EXT_CSD_HS_CTRL_REL bit is set. The values can be
> > + * changed only once and before partitioning is completed. */
> > + wr_rel_set = ext_csd[EXT_CSD_WR_REL_SET];
> > + if (conf->user.wr_rel_change) {
> > + if (conf->user.wr_rel_set)
> > + wr_rel_set |= EXT_CSD_WR_DATA_REL_USR;
> > + else
> > + wr_rel_set &= ~EXT_CSD_WR_DATA_REL_USR;
> > + }
> > + for (pidx = 0; pidx < 4; pidx++) {
> > + if (conf->gp_part[pidx].wr_rel_change) {
> > + if (conf->gp_part[pidx].wr_rel_set)
> > + wr_rel_set |= EXT_CSD_WR_DATA_REL_GP(pidx);
> > + else
> > + wr_rel_set &= ~EXT_CSD_WR_DATA_REL_GP(pidx);
> > + }
> > + }
> > +
> > + if (wr_rel_set != ext_csd[EXT_CSD_WR_REL_SET] &&
> > + !(ext_csd[EXT_CSD_WR_REL_PARAM] & EXT_CSD_HS_CTRL_REL)) {
> > + puts("Card does not support host controlled partition write "
> > + "reliability settings\n");
> > + return -EMEDIUMTYPE;
> > + }
> > +
> > if (ext_csd[EXT_CSD_PART_SETTING_COMPLETED] & PART_SETTING_COMPLETED) {
> > printf("Card already partitioned\n");
> > return -EPERM;
> > @@ -745,6 +773,17 @@ int mmc_hwpart_config(struct mmc *mmc,
> > if (mode == MMC_HWPART_CONF_SET)
> > return 0;
> >
> > + /* The WR_REL_SET is a write-once register but shall be
> > + * written before setting PART_SETTING_COMPLETED. As it is
> > + * write-once we can only write it when completing the
> > + * partitioning. */
> > + if (wr_rel_set != ext_csd[EXT_CSD_WR_REL_SET]) {
> > + err = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL,
> > + EXT_CSD_WR_REL_SET, wr_rel_set);
> > + if (err)
> > + return err;
> > + }
> > +
> > /* 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
> > diff --git a/include/mmc.h b/include/mmc.h
> > index 7892880..33595f0 100644
> > --- a/include/mmc.h
> > +++ b/include/mmc.h
> > @@ -154,6 +154,8 @@
> > #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_WR_REL_PARAM 166 /* R */
> > +#define EXT_CSD_WR_REL_SET 167 /* R/W */
> > #define EXT_CSD_RPMB_MULT 168 /* RO */
> > #define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */
> > #define EXT_CSD_BOOT_BUS_WIDTH 177
> > @@ -204,6 +206,11 @@
> > #define EXT_CSD_ENH_USR (1 << 0) /* user data area is enhanced */
> > #define EXT_CSD_ENH_GP(x) (1 << ((x)+1)) /* GP part (x+1) is
> enhanced */
> >
> > +#define EXT_CSD_HS_CTRL_REL (1 << 0) /* host controlled WR_REL_SET */
> > +
> > +#define EXT_CSD_WR_DATA_REL_USR (1 << 0) /* user data area
> WR_REL */
> > +#define EXT_CSD_WR_DATA_REL_GP(x) (1 << ((x)+1)) /* GP part (x+1)
> WR_REL */
> > +
> > #define R1_ILLEGAL_COMMAND (1 << 22)
> > #define R1_APP_CMD (1 << 5)
> >
> > @@ -331,11 +338,17 @@ struct mmc {
> > };
> >
> > + } user;
> > struct {
> > uint size; /* in 512-byte sectors */
> > - int enhanced;
> > + unsigned enhanced : 1;
> > + unsigned wr_rel_change : 1;
> > + unsigned wr_rel_set : 1;
> > } gp_part[4];
> > };
> >
> > --
> > 1.7.1
> >
>
> Regards
>
> - Pantelis
More information about the U-Boot
mailing list