From: Adrian Hunter <adrian.hun...@nokia.com>
SD/MMC cards tend to support an erase operation. In addition, eMMC v4.4
cards can support secure erase, trim and secure trim operations that are
all variants of the basic erase command.
SD/MMC device attributes "erase_size" and "preferred_erase_size" have been
added.
"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.
Signed-off-by: Adrian Hunter <adrian.hun...@nokia.com>
Acked-by: Jens Axboe <ax...@kernel.dk>
Cc: Kyungmin Park <kmp...@infradead.org>
Cc: Madhusudhan Chikkature <madhu...@ti.com>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Ben Gardiner <bengardi...@nanometrics.ca>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
---
Documentation/00-INDEX | 2
Documentation/mmc/00-INDEX | 4
Documentation/mmc/mmc-dev-attrs.txt | 56 ++++
drivers/mmc/core/core.c | 346 ++++++++++++++++++++++++++
drivers/mmc/core/core.h | 2
drivers/mmc/core/mmc.c | 47 +++
drivers/mmc/core/sd.c | 82 ++++++
drivers/mmc/core/sd_ops.c | 48 +++
drivers/mmc/core/sd_ops.h | 1
include/linux/mmc/card.h | 20 +
include/linux/mmc/core.h | 19 +
include/linux/mmc/host.h | 1
include/linux/mmc/mmc.h | 26 +
include/linux/mmc/sd.h | 5
14 files changed, 651 insertions(+), 8 deletions(-)
diff -puN
Documentation/00-INDEX~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
Documentation/00-INDEX
---
a/Documentation/00-INDEX~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/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 -puN /dev/null Documentation/mmc/00-INDEX
--- /dev/null
+++ a/Documentation/mmc/00-INDEX
@@ -0,0 +1,4 @@
+00-INDEX
+ - this file
+mmc-dev-attrs.txt
+ - info on SD and MMC device attributes
diff -puN /dev/null Documentation/mmc/mmc-dev-attrs.txt
--- /dev/null
+++ a/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 -puN
drivers/mmc/core/core.c~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
drivers/mmc/core/core.c
---
a/drivers/mmc/core/core.c~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/drivers/mmc/core/core.c
@@ -1050,6 +1050,352 @@ void mmc_detect_change(struct mmc_host *
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 -puN
drivers/mmc/core/core.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
drivers/mmc/core/core.h
---
a/drivers/mmc/core/core.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/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 -puN
drivers/mmc/core/mmc.c~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
drivers/mmc/core/mmc.c
---
a/drivers/mmc/core/mmc.c~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/drivers/mmc/core/mmc.c
@@ -108,13 +108,23 @@ static int mmc_decode_cid(struct mmc_car
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_car
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_c
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",
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
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 -puN
drivers/mmc/core/sd.c~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
drivers/mmc/core/sd.c
---
a/drivers/mmc/core/sd.c~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/drivers/mmc/core/sd.c
@@ -119,6 +119,13 @@ static int mmc_decode_csd(struct mmc_car
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_car
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_car
return -EINVAL;
}
+ card->erase_size = csd->erase_size;
+
return 0;
}
@@ -179,10 +189,68 @@ static int mmc_decode_scr(struct mmc_car
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[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 *h
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 -puN
drivers/mmc/core/sd_ops.c~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
drivers/mmc/core/sd_ops.c
---
a/drivers/mmc/core/sd_ops.c~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/drivers/mmc/core/sd_ops.c
@@ -346,3 +346,51 @@ int mmc_sd_switch(struct mmc_card *card,
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 -puN
drivers/mmc/core/sd_ops.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
drivers/mmc/core/sd_ops.h
---
a/drivers/mmc/core/sd_ops.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/drivers/mmc/core/sd_ops.h
@@ -19,6 +19,7 @@ int mmc_send_relative_addr(struct mmc_ho
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 -puN
include/linux/mmc/card.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
include/linux/mmc/card.h
---
a/include/linux/mmc/card.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/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 -puN
include/linux/mmc/core.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
include/linux/mmc/core.h
---
a/include/linux/mmc/core.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/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_h
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 -puN
include/linux/mmc/host.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
include/linux/mmc/host.h
---
a/include/linux/mmc/host.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/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 -puN
include/linux/mmc/mmc.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
include/linux/mmc/mmc.h
---
a/include/linux/mmc/mmc.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/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 -puN
include/linux/mmc/sd.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
include/linux/mmc/sd.h
---
a/include/linux/mmc/sd.h~mmc-add-erase-secure-erase-trim-and-secure-trim-operations
+++ a/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 */
_
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