14 files changed, 651 insertions, 8 deletions

diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
index 9e642c5bf526..8dfc6708a257 100644
--- a/Documentation/00-INDEX
+++ b/Documentation/00-INDEX
@@ -232,6 +232,8 @@ memory.txt
         - info on typical Linux memory problems.
 mips/
         - directory with info about Linux on MIPS architecture.
+mmc/
+        - directory with info about the MMC subsystem
 mono.txt
         - how to execute Mono-based .NET binaries with the help of BINFMT_MISC.
 mutex-design.txt
diff --git a/Documentation/mmc/00-INDEX b/Documentation/mmc/00-INDEX
new file mode 100644
index 000000000000..fca586f5b853
--- /dev/null
+++ b/Documentation/mmc/00-INDEX
@@ -0,0 +1,4 @@
+00-INDEX
+        - this file
+mmc-dev-attrs.txt
+        - info on SD and MMC device attributes
diff --git a/Documentation/mmc/mmc-dev-attrs.txt b/Documentation/mmc/mmc-dev-attrs.txt
new file mode 100644
index 000000000000..ff2bd685bced
--- /dev/null
+++ b/Documentation/mmc/mmc-dev-attrs.txt
@@ -0,0 +1,56 @@
+SD and MMC Device Attributes
+============================
+
+All attributes are read-only.
+
+        cid                     Card Identifaction Register
+        csd                     Card Specific Data Register
+        scr                     SD Card Configuration Register (SD only)
+        date                    Manufacturing Date (from CID Register)
+        fwrev                   Firmware/Product Revision (from CID Register) (SD and MMCv1 only)
+        hwrev                   Hardware/Product Revision (from CID Register) (SD and MMCv1 only)
+        manfid                  Manufacturer ID (from CID Register)
+        name                    Product Name (from CID Register)
+        oemid                   OEM/Application ID (from CID Register)
+        serial                  Product Serial Number (from CID Register)
+        erase_size              Erase group size
+        preferred_erase_size    Preferred erase size
+
+Note on Erase Size and Preferred Erase Size:
+
+        "erase_size" is the  minimum size, in bytes, of an erase
+        operation.  For MMC, "erase_size" is the erase group size
+        reported by the card.  Note that "erase_size" does not apply
+        to trim or secure trim operations where the minimum size is
+        always one 512 byte sector.  For SD, "erase_size" is 512
+        if the card is block-addressed, 0 otherwise.
+
+        SD/MMC cards can erase an arbitrarily large area up to and
+        including the whole card.  When erasing a large area it may
+        be desirable to do it in smaller chunks for three reasons:
+                1. A single erase command will make all other I/O on
+                the card wait.  This is not a problem if the whole card
+                is being erased, but erasing one partition will make
+                I/O for another partition on the same card wait for the
+                duration of the erase - which could be a several
+                minutes.
+                2. To be able to inform the user of erase progress.
+                3. The erase timeout becomes too large to be very
+                useful.  Because the erase timeout contains a margin
+                which is multiplied by the size of the erase area,
+                the value can end up being several minutes for large
+                areas.
+
+        "erase_size" is not the most efficient unit to erase
+        (especially for SD where it is just one sector),
+        hence "preferred_erase_size" provides a good chunk
+        size for erasing large areas.
+
+        For MMC, "preferred_erase_size" is the high-capacity
+        erase size if a card specifies one, otherwise it is
+        based on the capacity of the card.
+
+        For SD, "preferred_erase_size" is the allocation unit
+        size specified by the card.
+
+        "preferred_erase_size" is in bytes.
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 83240faa1dc8..5db49b124ffa 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1050,6 +1050,352 @@ void mmc_detect_change(struct mmc_host *host, unsigned long delay)
 
 EXPORT_SYMBOL(mmc_detect_change);
 
+void mmc_init_erase(struct mmc_card *card)
+{
+        unsigned int sz;
+
+        if (is_power_of_2(card->erase_size))
+                card->erase_shift = ffs(card->erase_size) - 1;
+        else
+                card->erase_shift = 0;
+
+        /*
+         * It is possible to erase an arbitrarily large area of an SD or MMC
+         * card.  That is not desirable because it can take a long time
+         * (minutes) potentially delaying more important I/O, and also the
+         * timeout calculations become increasingly hugely over-estimated.
+         * Consequently, 'pref_erase' is defined as a guide to limit erases
+         * to that size and alignment.
+         *
+         * For SD cards that define Allocation Unit size, limit erases to one
+         * Allocation Unit at a time.  For MMC cards that define High Capacity
+         * Erase Size, whether it is switched on or not, limit to that size.
+         * Otherwise just have a stab at a good value.  For modern cards it
+         * will end up being 4MiB.  Note that if the value is too small, it
+         * can end up taking longer to erase.
+         */
+        if (mmc_card_sd(card) && card->ssr.au) {
+                card->pref_erase = card->ssr.au;
+                card->erase_shift = ffs(card->ssr.au) - 1;
+        } else if (card->ext_csd.hc_erase_size) {
+                card->pref_erase = card->ext_csd.hc_erase_size;
+        } else {
+                sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
+                if (sz < 128)
+                        card->pref_erase = 512 * 1024 / 512;
+                else if (sz < 512)
+                        card->pref_erase = 1024 * 1024 / 512;
+                else if (sz < 1024)
+                        card->pref_erase = 2 * 1024 * 1024 / 512;
+                else
+                        card->pref_erase = 4 * 1024 * 1024 / 512;
+                if (card->pref_erase < card->erase_size)
+                        card->pref_erase = card->erase_size;
+                else {
+                        sz = card->pref_erase % card->erase_size;
+                        if (sz)
+                                card->pref_erase += card->erase_size - sz;
+                }
+        }
+}
+
+static void mmc_set_mmc_erase_timeout(struct mmc_card *card,
+                                      struct mmc_command *cmd,
+                                      unsigned int arg, unsigned int qty)
+{
+        unsigned int erase_timeout;
+
+        if (card->ext_csd.erase_group_def & 1) {
+                /* High Capacity Erase Group Size uses HC timeouts */
+                if (arg == MMC_TRIM_ARG)
+                        erase_timeout = card->ext_csd.trim_timeout;
+                else
+                        erase_timeout = card->ext_csd.hc_erase_timeout;
+        } else {
+                /* CSD Erase Group Size uses write timeout */
+                unsigned int mult = (10 << card->csd.r2w_factor);
+                unsigned int timeout_clks = card->csd.tacc_clks * mult;
+                unsigned int timeout_us;
+
+                /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
+                if (card->csd.tacc_ns < 1000000)
+                        timeout_us = (card->csd.tacc_ns * mult) / 1000;
+                else
+                        timeout_us = (card->csd.tacc_ns / 1000) * mult;
+
+                /*
+                 * ios.clock is only a target.  The real clock rate might be
+                 * less but not that much less, so fudge it by multiplying by 2.
+                 */
+                timeout_clks <<= 1;
+                timeout_us += (timeout_clks * 1000) /
+                              (card->host->ios.clock / 1000);
+
+                erase_timeout = timeout_us / 1000;
+
+                /*
+                 * Theoretically, the calculation could underflow so round up
+                 * to 1ms in that case.
+                 */
+                if (!erase_timeout)
+                        erase_timeout = 1;
+        }
+
+        /* Multiplier for secure operations */
+        if (arg & MMC_SECURE_ARGS) {
+                if (arg == MMC_SECURE_ERASE_ARG)
+                        erase_timeout *= card->ext_csd.sec_erase_mult;
+                else
+                        erase_timeout *= card->ext_csd.sec_trim_mult;
+        }
+
+        erase_timeout *= qty;
+
+        /*
+         * Ensure at least a 1 second timeout for SPI as per
+         * 'mmc_set_data_timeout()'
+         */
+        if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
+                erase_timeout = 1000;
+
+        cmd->erase_timeout = erase_timeout;
+}
+
+static void mmc_set_sd_erase_timeout(struct mmc_card *card,
+                                     struct mmc_command *cmd, unsigned int arg,
+                                     unsigned int qty)
+{
+        if (card->ssr.erase_timeout) {
+                /* Erase timeout specified in SD Status Register (SSR) */
+                cmd->erase_timeout = card->ssr.erase_timeout * qty +
+                                     card->ssr.erase_offset;
+        } else {
+                /*
+                 * Erase timeout not specified in SD Status Register (SSR) so
+                 * use 250ms per write block.
+                 */
+                cmd->erase_timeout = 250 * qty;
+        }
+
+        /* Must not be less than 1 second */
+        if (cmd->erase_timeout < 1000)
+                cmd->erase_timeout = 1000;
+}
+
+static void mmc_set_erase_timeout(struct mmc_card *card,
+                                  struct mmc_command *cmd, unsigned int arg,
+                                  unsigned int qty)
+{
+        if (mmc_card_sd(card))
+                mmc_set_sd_erase_timeout(card, cmd, arg, qty);
+        else
+                mmc_set_mmc_erase_timeout(card, cmd, arg, qty);
+}
+
+static int mmc_do_erase(struct mmc_card *card, unsigned int from,
+                        unsigned int to, unsigned int arg)
+{
+        struct mmc_command cmd;
+        unsigned int qty = 0;
+        int err;
+
+        /*
+         * qty is used to calculate the erase timeout which depends on how many
+         * erase groups (or allocation units in SD terminology) are affected.
+         * We count erasing part of an erase group as one erase group.
+         * For SD, the allocation units are always a power of 2.  For MMC, the
+         * erase group size is almost certainly also power of 2, but it does not
+         * seem to insist on that in the JEDEC standard, so we fall back to
+         * division in that case.  SD may not specify an allocation unit size,
+         * in which case the timeout is based on the number of write blocks.
+         *
+         * Note that the timeout for secure trim 2 will only be correct if the
+         * number of erase groups specified is the same as the total of all
+         * preceding secure trim 1 commands.  Since the power may have been
+         * lost since the secure trim 1 commands occurred, it is generally
+         * impossible to calculate the secure trim 2 timeout correctly.
+         */
+        if (card->erase_shift)
+                qty += ((to >> card->erase_shift) -
+                        (from >> card->erase_shift)) + 1;
+        else if (mmc_card_sd(card))
+                qty += to - from + 1;
+        else
+                qty += ((to / card->erase_size) -
+                        (from / card->erase_size)) + 1;
+
+        if (!mmc_card_blockaddr(card)) {
+                from <<= 9;
+                to <<= 9;
+        }
+
+        memset(&cmd, 0, sizeof(struct mmc_command));
+        if (mmc_card_sd(card))
+                cmd.opcode = SD_ERASE_WR_BLK_START;
+        else
+                cmd.opcode = MMC_ERASE_GROUP_START;
+        cmd.arg = from;
+        cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
+        err = mmc_wait_for_cmd(card->host, &cmd, 0);
+        if (err) {
+                printk(KERN_ERR "mmc_erase: group start error %d, "
+                       "status %#x\n", err, cmd.resp[0]);
+                err = -EINVAL;
+                goto out;
+        }
+
+        memset(&cmd, 0, sizeof(struct mmc_command));
+        if (mmc_card_sd(card))
+                cmd.opcode = SD_ERASE_WR_BLK_END;
+        else
+                cmd.opcode = MMC_ERASE_GROUP_END;
+        cmd.arg = to;
+        cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
+        err = mmc_wait_for_cmd(card->host, &cmd, 0);
+        if (err) {
+                printk(KERN_ERR "mmc_erase: group end error %d, status %#x\n",
+                       err, cmd.resp[0]);
+                err = -EINVAL;
+                goto out;
+        }
+
+        memset(&cmd, 0, sizeof(struct mmc_command));
+        cmd.opcode = MMC_ERASE;
+        cmd.arg = arg;
+        cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
+        mmc_set_erase_timeout(card, &cmd, arg, qty);
+        err = mmc_wait_for_cmd(card->host, &cmd, 0);
+        if (err) {
+                printk(KERN_ERR "mmc_erase: erase error %d, status %#x\n",
+                       err, cmd.resp[0]);
+                err = -EIO;
+                goto out;
+        }
+
+        if (mmc_host_is_spi(card->host))
+                goto out;
+
+        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;
+                /* Do not retry else we can't see errors */
+                err = mmc_wait_for_cmd(card->host, &cmd, 0);
+                if (err || (cmd.resp[0] & 0xFDF92000)) {
+                        printk(KERN_ERR "error %d requesting status %#x\n",
+                                err, cmd.resp[0]);
+                        err = -EIO;
+                        goto out;
+                }
+        } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
+                 R1_CURRENT_STATE(cmd.resp[0]) == 7);
+out:
+        return err;
+}
+
+/**
+ * mmc_erase - erase sectors.
+ * @card: card to erase
+ * @from: first sector to erase
+ * @nr: number of sectors to erase
+ * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
+ *
+ * Caller must claim host before calling this function.
+ */
+int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
+              unsigned int arg)
+{
+        unsigned int rem, to = from + nr;
+
+        if (!(card->host->caps & MMC_CAP_ERASE) ||
+            !(card->csd.cmdclass & CCC_ERASE))
+                return -EOPNOTSUPP;
+
+        if (!card->erase_size)
+                return -EOPNOTSUPP;
+
+        if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
+                return -EOPNOTSUPP;
+
+        if ((arg & MMC_SECURE_ARGS) &&
+            !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
+                return -EOPNOTSUPP;
+
+        if ((arg & MMC_TRIM_ARGS) &&
+            !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
+                return -EOPNOTSUPP;
+
+        if (arg == MMC_SECURE_ERASE_ARG) {
+                if (from % card->erase_size || nr % card->erase_size)
+                        return -EINVAL;
+        }
+
+        if (arg == MMC_ERASE_ARG) {
+                rem = from % card->erase_size;
+                if (rem) {
+                        rem = card->erase_size - rem;
+                        from += rem;
+                        if (nr > rem)
+                                nr -= rem;
+                        else
+                                return 0;
+                }
+                rem = nr % card->erase_size;
+                if (rem)
+                        nr -= rem;
+        }
+
+        if (nr == 0)
+                return 0;
+
+        to = from + nr;
+
+        if (to <= from)
+                return -EINVAL;
+
+        /* 'from' and 'to' are inclusive */
+        to -= 1;
+
+        return mmc_do_erase(card, from, to, arg);
+}
+EXPORT_SYMBOL(mmc_erase);
+
+int mmc_can_erase(struct mmc_card *card)
+{
+        if ((card->host->caps & MMC_CAP_ERASE) &&
+            (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
+                return 1;
+        return 0;
+}
+EXPORT_SYMBOL(mmc_can_erase);
+
+int mmc_can_trim(struct mmc_card *card)
+{
+        if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)
+                return 1;
+        return 0;
+}
+EXPORT_SYMBOL(mmc_can_trim);
+
+int mmc_can_secure_erase_trim(struct mmc_card *card)
+{
+        if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
+                return 1;
+        return 0;
+}
+EXPORT_SYMBOL(mmc_can_secure_erase_trim);
+
+int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
+                            unsigned int nr)
+{
+        if (!card->erase_size)
+                return 0;
+        if (from % card->erase_size || nr % card->erase_size)
+                return 0;
+        return 1;
+}
+EXPORT_SYMBOL(mmc_erase_group_aligned);
 
 void mmc_rescan(struct work_struct *work)
 {
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index a811c52a1659..9d9eef50e5d1 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -29,6 +29,8 @@ struct mmc_bus_ops {
 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
 void mmc_detach_bus(struct mmc_host *host);
 
+void mmc_init_erase(struct mmc_card *card);
+
 void mmc_set_chip_select(struct mmc_host *host, int mode);
 void mmc_set_clock(struct mmc_host *host, unsigned int hz);
 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index ccba3869c029..6909a54c39be 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -108,13 +108,23 @@ static int mmc_decode_cid(struct mmc_card *card)
         return 0;
 }
 
+static void mmc_set_erase_size(struct mmc_card *card)
+{
+        if (card->ext_csd.erase_group_def & 1)
+                card->erase_size = card->ext_csd.hc_erase_size;
+        else
+                card->erase_size = card->csd.erase_size;
+
+        mmc_init_erase(card);
+}
+
 /*
  * Given a 128-bit response, decode to our card CSD structure.
  */
 static int mmc_decode_csd(struct mmc_card *card)
 {
         struct mmc_csd *csd = &card->csd;
-        unsigned int e, m;
+        unsigned int e, m, a, b;
         u32 *resp = card->raw_csd;
 
         /*
@@ -152,6 +162,13 @@ static int mmc_decode_csd(struct mmc_card *card)
         csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
         csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
 
+        if (csd->write_blkbits >= 9) {
+                a = UNSTUFF_BITS(resp, 42, 5);
+                b = UNSTUFF_BITS(resp, 37, 5);
+                csd->erase_size = (a + 1) * (b + 1);
+                csd->erase_size <<= csd->write_blkbits - 9;
+        }
+
         return 0;
 }
 
@@ -261,8 +278,30 @@ static int mmc_read_ext_csd(struct mmc_card *card)
                 if (sa_shift > 0 && sa_shift <= 0x17)
                         card->ext_csd.sa_timeout =
                                         1 << ext_csd[EXT_CSD_S_A_TIMEOUT];
+                card->ext_csd.erase_group_def =
+                        ext_csd[EXT_CSD_ERASE_GROUP_DEF];
+                card->ext_csd.hc_erase_timeout = 300 *
+                        ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
+                card->ext_csd.hc_erase_size =
+                        ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
+        }
+
+        if (card->ext_csd.rev >= 4) {
+                card->ext_csd.sec_trim_mult =
+                        ext_csd[EXT_CSD_SEC_TRIM_MULT];
+                card->ext_csd.sec_erase_mult =
+                        ext_csd[EXT_CSD_SEC_ERASE_MULT];
+                card->ext_csd.sec_feature_support =
+                        ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
+                card->ext_csd.trim_timeout = 300 *
+                        ext_csd[EXT_CSD_TRIM_MULT];
         }
 
+        if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
+                card->erased_byte = 0xFF;
+        else
+                card->erased_byte = 0x0;
+
 out:
         kfree(ext_csd);
 
@@ -274,6 +313,8 @@ MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
 MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
         card->raw_csd[2], card->raw_csd[3]);
 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
+MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
+MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
@@ -285,6 +326,8 @@ static struct attribute *mmc_std_attrs[] = {
         &dev_attr_cid.attr,
         &dev_attr_csd.attr,
         &dev_attr_date.attr,
+        &dev_attr_erase_size.attr,
+        &dev_attr_preferred_erase_size.attr,
         &dev_attr_fwrev.attr,
         &dev_attr_hwrev.attr,
         &dev_attr_manfid.attr,
@@ -421,6 +464,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
                 err = mmc_read_ext_csd(card);
                 if (err)
                         goto free_card;
+                /* Erase size depends on CSD and Extended CSD */
+                mmc_set_erase_size(card);
         }
 
         /*
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index e6d7d9fab446..0f5241085557 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -119,6 +119,13 @@ static int mmc_decode_csd(struct mmc_card *card)
                 csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
                 csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
                 csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
+
+                if (UNSTUFF_BITS(resp, 46, 1)) {
+                        csd->erase_size = 1;
+                } else if (csd->write_blkbits >= 9) {
+                        csd->erase_size = UNSTUFF_BITS(resp, 39, 7) + 1;
+                        csd->erase_size <<= csd->write_blkbits - 9;
+                }
                 break;
         case 1:
                 /*
@@ -147,6 +154,7 @@ static int mmc_decode_csd(struct mmc_card *card)
                 csd->r2w_factor = 4; /* Unused */
                 csd->write_blkbits = 9;
                 csd->write_partial = 0;
+                csd->erase_size = 1;
                 break;
         default:
                 printk(KERN_ERR "%s: unrecognised CSD structure version %d\n",
@@ -154,6 +162,8 @@ static int mmc_decode_csd(struct mmc_card *card)
                 return -EINVAL;
         }
 
+        card->erase_size = csd->erase_size;
+
         return 0;
 }
 
@@ -179,10 +189,68 @@ static int mmc_decode_scr(struct mmc_card *card)
         scr->sda_vsn = UNSTUFF_BITS(resp, 56, 4);
         scr->bus_widths = UNSTUFF_BITS(resp, 48, 4);
 
+        if (UNSTUFF_BITS(resp, 55, 1))
+                card->erased_byte = 0xFF;
+        else
+                card->erased_byte = 0x0;
+
         return 0;
 }
 
 /*
+ * Fetch and process SD Status register.
+ */
+static int mmc_read_ssr(struct mmc_card *card)
+{
+        unsigned int au, es, et, eo;
+        int err, i;
+        u32 *ssr;
+
+        if (!(card->csd.cmdclass & CCC_APP_SPEC)) {
+                printk(KERN_WARNING "%s: card lacks mandatory SD Status "
+                        "function.\n", mmc_hostname(card->host));
+                return 0;
+        }
+
+        ssr = kmalloc(64, GFP_KERNEL);
+        if (!ssr)
+                return -ENOMEM;
+
+        err = mmc_app_sd_status(card, ssr);
+        if (err) {
+                printk(KERN_WARNING "%s: problem reading SD Status "
+                        "register.\n", mmc_hostname(card->host));
+                err = 0;
+                goto out;
+        }
+
+        for (i = 0; i < 16; i++)
+                ssr[i] = be32_to_cpu(ssr[i]);
+
+        /*
+         * UNSTUFF_BITS only works with four u32s so we have to offset the
+         * bitfield positions accordingly.
+         */
+        au = UNSTUFF_BITS(ssr, 428 - 384, 4);
+        if (au > 0 || au <= 9) {
+                card->ssr.au = 1 << (au + 4);
+                es = UNSTUFF_BITS(ssr, 408 - 384, 16);
+                et = UNSTUFF_BITS(ssr, 402 - 384, 6);
+                eo = UNSTUFF_BITS(ssr, 400 - 384, 2);
+                if (es && et) {
+                        card->ssr.erase_timeout = (et * 1000) / es;
+                        card->ssr.erase_offset = eo * 1000;
+                }
+        } else {
+                printk(KERN_WARNING "%s: SD Status: Invalid Allocation Unit "
+                        "size.\n", mmc_hostname(card->host));
+        }
+out:
+        kfree(ssr);
+        return err;
+}
+
+/*
  * Fetches and decodes switch information
  */
 static int mmc_read_switch(struct mmc_card *card)
@@ -289,6 +357,8 @@ MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
         card->raw_csd[2], card->raw_csd[3]);
 MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
 MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
+MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
+MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
 MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
@@ -302,6 +372,8 @@ static struct attribute *sd_std_attrs[] = {
         &dev_attr_csd.attr,
         &dev_attr_scr.attr,
         &dev_attr_date.attr,
+        &dev_attr_erase_size.attr,
+        &dev_attr_preferred_erase_size.attr,
         &dev_attr_fwrev.attr,
         &dev_attr_hwrev.attr,
         &dev_attr_manfid.attr,
@@ -397,6 +469,16 @@ int mmc_sd_setup_card(struct mmc_host *host, struct mmc_card *card,
                         return err;
 
                 /*
+                 * Fetch and process SD Status register.
+                 */
+                err = mmc_read_ssr(card);
+                if (err)
+                        return err;
+
+                /* Erase init depends on CSD and SSR */
+                mmc_init_erase(card);
+
+                /*
                  * Fetch switch information from card.
                  */
                 err = mmc_read_switch(card);
diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
index 63772e7e7608..797cdb5887fd 100644
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -346,3 +346,51 @@ int mmc_sd_switch(struct mmc_card *card, int mode, int group,
         return 0;
 }
 
+int mmc_app_sd_status(struct mmc_card *card, void *ssr)
+{
+        int err;
+        struct mmc_request mrq;
+        struct mmc_command cmd;
+        struct mmc_data data;
+        struct scatterlist sg;
+
+        BUG_ON(!card);
+        BUG_ON(!card->host);
+        BUG_ON(!ssr);
+
+        /* NOTE: caller guarantees ssr is heap-allocated */
+
+        err = mmc_app_cmd(card->host, card);
+        if (err)
+                return err;
+
+        memset(&mrq, 0, sizeof(struct mmc_request));
+        memset(&cmd, 0, sizeof(struct mmc_command));
+        memset(&data, 0, sizeof(struct mmc_data));
+
+        mrq.cmd = &cmd;
+        mrq.data = &data;
+
+        cmd.opcode = SD_APP_SD_STATUS;
+        cmd.arg = 0;
+        cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+        data.blksz = 64;
+        data.blocks = 1;
+        data.flags = MMC_DATA_READ;
+        data.sg = &sg;
+        data.sg_len = 1;
+
+        sg_init_one(&sg, ssr, 64);
+
+        mmc_set_data_timeout(&data, card);
+
+        mmc_wait_for_req(card->host, &mrq);
+
+        if (cmd.error)
+                return cmd.error;
+        if (data.error)
+                return data.error;
+
+        return 0;
+}
diff --git a/drivers/mmc/core/sd_ops.h b/drivers/mmc/core/sd_ops.h
index 9742d8a30664..ffc2305d905f 100644
--- a/drivers/mmc/core/sd_ops.h
+++ b/drivers/mmc/core/sd_ops.h
@@ -19,6 +19,7 @@ int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca);
 int mmc_app_send_scr(struct mmc_card *card, u32 *scr);
 int mmc_sd_switch(struct mmc_card *card, int mode, int group,
         u8 value, u8 *resp);
+int mmc_app_sd_status(struct mmc_card *card, void *ssr);
 
 #endif
 
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 4d893eaf8174..6b7525099e56 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -31,6 +31,7 @@ struct mmc_csd {
         unsigned int            tacc_ns;
         unsigned int            r2w_factor;
         unsigned int            max_dtr;
+        unsigned int            erase_size;             /* In sectors */
         unsigned int            read_blkbits;
         unsigned int            write_blkbits;
         unsigned int            capacity;
@@ -42,9 +43,16 @@ struct mmc_csd {
 
 struct mmc_ext_csd {
         u8                      rev;
+        u8                      erase_group_def;
+        u8                      sec_feature_support;
         unsigned int            sa_timeout;             /* Units: 100ns */
         unsigned int            hs_max_dtr;
         unsigned int            sectors;
+        unsigned int            hc_erase_size;          /* In sectors */
+        unsigned int            hc_erase_timeout;       /* In milliseconds */
+        unsigned int            sec_trim_mult;  /* Secure trim multiplier  */
+        unsigned int            sec_erase_mult; /* Secure erase multiplier */
+        unsigned int            trim_timeout;           /* In milliseconds */
 };
 
 struct sd_scr {
@@ -54,6 +62,12 @@ struct sd_scr {
 #define SD_SCR_BUS_WIDTH_4      (1<<2)
 };
 
+struct sd_ssr {
+        unsigned int            au;                     /* In sectors */
+        unsigned int            erase_timeout;          /* In milliseconds */
+        unsigned int            erase_offset;           /* In milliseconds */
+};
+
 struct sd_switch_caps {
         unsigned int            hs_max_dtr;
 };
@@ -106,6 +120,11 @@ struct mmc_card {
 #define MMC_QUIRK_NONSTD_SDIO   (1<<2)          /* non-standard SDIO card attached */
                                                 /* (missing CIA registers) */
 
+        unsigned int            erase_size;     /* erase size in sectors */
+        unsigned int            erase_shift;    /* if erase unit is power 2 */
+        unsigned int            pref_erase;     /* in sectors */
+        u8                      erased_byte;    /* value of erased bytes */
+
         u32                     raw_cid[4];     /* raw card CID */
         u32                     raw_csd[4];     /* raw card CSD */
         u32                     raw_scr[2];     /* raw card SCR */
@@ -113,6 +132,7 @@ struct mmc_card {
         struct mmc_csd          csd;            /* card specific */
         struct mmc_ext_csd      ext_csd;        /* mmc v4 extended card specific */
         struct sd_scr           scr;            /* extra SD information */
+        struct sd_ssr           ssr;            /* yet more SD information */
         struct sd_switch_caps   sw_caps;        /* switch (CMD6) caps */
 
         unsigned int            sdio_funcs;     /* number of SDIO functions */
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index e4898e9eeb59..7429033acb66 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -92,6 +92,8 @@ struct mmc_command {
  *              actively failing requests
  */
 
+        unsigned int            erase_timeout;  /* in milliseconds */
+
         struct mmc_data         *data;          /* data segment associated with cmd */
         struct mmc_request      *mrq;           /* associated request */
 };
@@ -134,6 +136,23 @@ extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
 extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
         struct mmc_command *, int);
 
+#define MMC_ERASE_ARG           0x00000000
+#define MMC_SECURE_ERASE_ARG    0x80000000
+#define MMC_TRIM_ARG            0x00000001
+#define MMC_SECURE_TRIM1_ARG    0x80000001
+#define MMC_SECURE_TRIM2_ARG    0x80008000
+
+#define MMC_SECURE_ARGS         0x80000000
+#define MMC_TRIM_ARGS           0x00008001
+
+extern int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
+                     unsigned int arg);
+extern int mmc_can_erase(struct mmc_card *card);
+extern int mmc_can_trim(struct mmc_card *card);
+extern int mmc_can_secure_erase_trim(struct mmc_card *card);
+extern int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
+                                   unsigned int nr);
+
 extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *);
 extern unsigned int mmc_align_data_size(struct mmc_card *, unsigned int);
 
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 513ff0376b09..1575b52c3bfa 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -156,6 +156,7 @@ struct mmc_host {
 #define MMC_CAP_DISABLE         (1 << 7)        /* Can the host be disabled */
 #define MMC_CAP_NONREMOVABLE    (1 << 8)        /* Nonremovable e.g. eMMC */
 #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9)        /* Waits while card is busy */
+#define MMC_CAP_ERASE           (1 << 10)       /* Allow erase/trim commands */
 
         mmc_pm_flag_t           pm_caps;        /* supported pm features */
 
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 52ce98866287..dd11ae51fb68 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -251,13 +251,21 @@ struct _mmc_csd {
  * EXT_CSD fields
  */
 
-#define EXT_CSD_BUS_WIDTH       183     /* R/W */
-#define EXT_CSD_HS_TIMING       185     /* R/W */
-#define EXT_CSD_CARD_TYPE       196     /* RO */
-#define EXT_CSD_STRUCTURE       194     /* RO */
-#define EXT_CSD_REV             192     /* RO */
-#define EXT_CSD_SEC_CNT         212     /* RO, 4 bytes */
-#define EXT_CSD_S_A_TIMEOUT     217
+#define EXT_CSD_ERASE_GROUP_DEF         175     /* R/W */
+#define EXT_CSD_ERASED_MEM_CONT         181     /* RO */
+#define EXT_CSD_BUS_WIDTH               183     /* R/W */
+#define EXT_CSD_HS_TIMING               185     /* R/W */
+#define EXT_CSD_REV                     192     /* RO */
+#define EXT_CSD_STRUCTURE               194     /* RO */
+#define EXT_CSD_CARD_TYPE               196     /* RO */
+#define EXT_CSD_SEC_CNT                 212     /* RO, 4 bytes */
+#define EXT_CSD_S_A_TIMEOUT             217     /* RO */
+#define EXT_CSD_ERASE_TIMEOUT_MULT      223     /* RO */
+#define EXT_CSD_HC_ERASE_GRP_SIZE       224     /* RO */
+#define EXT_CSD_SEC_TRIM_MULT           229     /* RO */
+#define EXT_CSD_SEC_ERASE_MULT          230     /* RO */
+#define EXT_CSD_SEC_FEATURE_SUPPORT     231     /* RO */
+#define EXT_CSD_TRIM_MULT               232     /* RO */
 
 /*
  * EXT_CSD field definitions
@@ -275,6 +283,10 @@ struct _mmc_csd {
 #define EXT_CSD_BUS_WIDTH_4     1       /* Card is in 4 bit mode */
 #define EXT_CSD_BUS_WIDTH_8     2       /* Card is in 8 bit mode */
 
+#define EXT_CSD_SEC_ER_EN       BIT(0)
+#define EXT_CSD_SEC_BD_BLK_EN   BIT(2)
+#define EXT_CSD_SEC_GB_CL_EN    BIT(4)
+
 /*
  * MMC_SWITCH access modes
  */
diff --git a/include/linux/mmc/sd.h b/include/linux/mmc/sd.h
index f310062cffb4..3fd85e088cc3 100644
--- a/include/linux/mmc/sd.h
+++ b/include/linux/mmc/sd.h
@@ -21,8 +21,13 @@
   /* class 10 */
 #define SD_SWITCH                 6   /* adtc [31:0] See below   R1  */
 
+  /* class 5 */
+#define SD_ERASE_WR_BLK_START    32   /* ac   [31:0] data addr   R1  */
+#define SD_ERASE_WR_BLK_END      33   /* ac   [31:0] data addr   R1  */
+
   /* Application commands */
 #define SD_APP_SET_BUS_WIDTH      6   /* ac   [1:0] bus width    R1  */
+#define SD_APP_SD_STATUS         13   /* adtc                    R1  */
 #define SD_APP_SEND_NUM_WR_BLKS  22   /* adtc                    R1  */
 #define SD_APP_OP_COND           41   /* bcr  [31:0] OCR         R3  */
 #define SD_APP_SEND_SCR          51   /* adtc                    R1  */