1 files changed, 413 insertions, 28 deletions

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 569e94d..5db49b1 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)
 {
@@ -1057,6 +1403,17 @@ void mmc_rescan(struct work_struct *work)
 		container_of(work, struct mmc_host, detect.work);
 	u32 ocr;
 	int err;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (host->rescan_disable) {
+		spin_unlock_irqrestore(&host->lock, flags);
+		return;
+	}
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
 
 	mmc_bus_get(host);
 
@@ -1099,8 +1456,15 @@ void mmc_rescan(struct work_struct *work)
 	 */
 	err = mmc_send_io_op_cond(host, 0, &ocr);
 	if (!err) {
-		if (mmc_attach_sdio(host, ocr))
-			mmc_power_off(host);
+		if (mmc_attach_sdio(host, ocr)) {
+			mmc_claim_host(host);
+			/* try SDMEM (but not MMC) even if SDIO is broken */
+			if (mmc_send_app_op_cond(host, 0, &ocr))
+				goto out_fail;
+
+			if (mmc_attach_sd(host, ocr))
+				mmc_power_off(host);
+		}
 		goto out;
 	}
 
@@ -1124,6 +1488,7 @@ void mmc_rescan(struct work_struct *work)
 		goto out;
 	}
 
+out_fail:
 	mmc_release_host(host);
 	mmc_power_off(host);
 
@@ -1266,19 +1631,6 @@ int mmc_suspend_host(struct mmc_host *host)
 	if (host->bus_ops && !host->bus_dead) {
 		if (host->bus_ops->suspend)
 			err = host->bus_ops->suspend(host);
-		if (err == -ENOSYS || !host->bus_ops->resume) {
-			/*
-			 * We simply "remove" the card in this case.
-			 * It will be redetected on resume.
-			 */
-			if (host->bus_ops->remove)
-				host->bus_ops->remove(host);
-			mmc_claim_host(host);
-			mmc_detach_bus(host);
-			mmc_release_host(host);
-			host->pm_flags = 0;
-			err = 0;
-		}
 	}
 	mmc_bus_put(host);
 
@@ -1310,28 +1662,61 @@ int mmc_resume_host(struct mmc_host *host)
 			printk(KERN_WARNING "%s: error %d during resume "
 					    "(card was removed?)\n",
 					    mmc_hostname(host), err);
-			if (host->bus_ops->remove)
-				host->bus_ops->remove(host);
-			mmc_claim_host(host);
-			mmc_detach_bus(host);
-			mmc_release_host(host);
-			/* no need to bother upper layers */
 			err = 0;
 		}
 	}
 	mmc_bus_put(host);
 
-	/*
-	 * We add a slight delay here so that resume can progress
-	 * in parallel.
-	 */
-	mmc_detect_change(host, 1);
-
 	return err;
 }
-
 EXPORT_SYMBOL(mmc_resume_host);
 
+/* Do the card removal on suspend if card is assumed removeable
+ * Do that in pm notifier while userspace isn't yet frozen, so we will be able
+   to sync the card.
+*/
+int mmc_pm_notify(struct notifier_block *notify_block,
+					unsigned long mode, void *unused)
+{
+	struct mmc_host *host = container_of(
+		notify_block, struct mmc_host, pm_notify);
+	unsigned long flags;
+
+
+	switch (mode) {
+	case PM_HIBERNATION_PREPARE:
+	case PM_SUSPEND_PREPARE:
+
+		spin_lock_irqsave(&host->lock, flags);
+		host->rescan_disable = 1;
+		spin_unlock_irqrestore(&host->lock, flags);
+		cancel_delayed_work_sync(&host->detect);
+
+		if (!host->bus_ops || host->bus_ops->suspend)
+			break;
+
+		mmc_claim_host(host);
+
+		if (host->bus_ops->remove)
+			host->bus_ops->remove(host);
+
+		mmc_detach_bus(host);
+		mmc_release_host(host);
+		host->pm_flags = 0;
+		break;
+
+	case PM_POST_SUSPEND:
+	case PM_POST_HIBERNATION:
+
+		spin_lock_irqsave(&host->lock, flags);
+		host->rescan_disable = 0;
+		spin_unlock_irqrestore(&host->lock, flags);
+		mmc_detect_change(host, 0);
+
+	}
+
+	return 0;
+}
 #endif
 
 static int __init mmc_init(void)