1 files changed, 226 insertions, 34 deletions

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index 78f75f00efc5..5f7c5920231a 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -19,6 +19,7 @@
 #include <linux/mmc/mmc.h>
 
 #include "core.h"
+#include "card.h"
 #include "host.h"
 #include "mmc_ops.h"
 
@@ -54,7 +55,7 @@ static const u8 tuning_blk_pattern_8bit[] = {
 	0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
 };
 
-int mmc_send_status(struct mmc_card *card, u32 *status)
+int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries)
 {
 	int err;
 	struct mmc_command cmd = {};
@@ -64,7 +65,7 @@ int mmc_send_status(struct mmc_card *card, u32 *status)
 		cmd.arg = card->rca << 16;
 	cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 
-	err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
+	err = mmc_wait_for_cmd(card->host, &cmd, retries);
 	if (err)
 		return err;
 
@@ -76,6 +77,12 @@ int mmc_send_status(struct mmc_card *card, u32 *status)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(__mmc_send_status);
+
+int mmc_send_status(struct mmc_card *card, u32 *status)
+{
+	return __mmc_send_status(card, status, MMC_CMD_RETRIES);
+}
 
 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
 {
@@ -200,24 +207,6 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
 	return err;
 }
 
-int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
-{
-	int err;
-	struct mmc_command cmd = {};
-
-	cmd.opcode = MMC_ALL_SEND_CID;
-	cmd.arg = 0;
-	cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
-
-	err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
-	if (err)
-		return err;
-
-	memcpy(cid, cmd.resp, sizeof(u32) * 4);
-
-	return 0;
-}
-
 int mmc_set_relative_addr(struct mmc_card *card)
 {
 	struct mmc_command cmd = {};
@@ -302,15 +291,11 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 	return 0;
 }
 
-int mmc_send_csd(struct mmc_card *card, u32 *csd)
+static int mmc_spi_send_csd(struct mmc_card *card, u32 *csd)
 {
 	int ret, i;
 	__be32 *csd_tmp;
 
-	if (!mmc_host_is_spi(card->host))
-		return mmc_send_cxd_native(card->host, card->rca << 16,
-				csd, MMC_SEND_CSD);
-
 	csd_tmp = kzalloc(16, GFP_KERNEL);
 	if (!csd_tmp)
 		return -ENOMEM;
@@ -327,18 +312,20 @@ err:
 	return ret;
 }
 
-int mmc_send_cid(struct mmc_host *host, u32 *cid)
+int mmc_send_csd(struct mmc_card *card, u32 *csd)
+{
+	if (mmc_host_is_spi(card->host))
+		return mmc_spi_send_csd(card, csd);
+
+	return mmc_send_cxd_native(card->host, card->rca << 16,	csd,
+				MMC_SEND_CSD);
+}
+
+static int mmc_spi_send_cid(struct mmc_host *host, u32 *cid)
 {
 	int ret, i;
 	__be32 *cid_tmp;
 
-	if (!mmc_host_is_spi(host)) {
-		if (!host->card)
-			return -EINVAL;
-		return mmc_send_cxd_native(host, host->card->rca << 16,
-				cid, MMC_SEND_CID);
-	}
-
 	cid_tmp = kzalloc(16, GFP_KERNEL);
 	if (!cid_tmp)
 		return -ENOMEM;
@@ -355,6 +342,14 @@ err:
 	return ret;
 }
 
+int mmc_send_cid(struct mmc_host *host, u32 *cid)
+{
+	if (mmc_host_is_spi(host))
+		return mmc_spi_send_cid(host, cid);
+
+	return mmc_send_cxd_native(host, 0, cid, MMC_ALL_SEND_CID);
+}
+
 int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
 {
 	int err;
@@ -800,7 +795,7 @@ int mmc_bus_test(struct mmc_card *card, u8 bus_width)
 	return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
 }
 
-int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
+static int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
 {
 	struct mmc_command cmd = {};
 	unsigned int opcode;
@@ -834,11 +829,208 @@ int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
 	return 0;
 }
 
+/**
+ *	mmc_interrupt_hpi - Issue for High priority Interrupt
+ *	@card: the MMC card associated with the HPI transfer
+ *
+ *	Issued High Priority Interrupt, and check for card status
+ *	until out-of prg-state.
+ */
+int mmc_interrupt_hpi(struct mmc_card *card)
+{
+	int err;
+	u32 status;
+	unsigned long prg_wait;
+
+	if (!card->ext_csd.hpi_en) {
+		pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
+		return 1;
+	}
+
+	mmc_claim_host(card->host);
+	err = mmc_send_status(card, &status);
+	if (err) {
+		pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
+		goto out;
+	}
+
+	switch (R1_CURRENT_STATE(status)) {
+	case R1_STATE_IDLE:
+	case R1_STATE_READY:
+	case R1_STATE_STBY:
+	case R1_STATE_TRAN:
+		/*
+		 * In idle and transfer states, HPI is not needed and the caller
+		 * can issue the next intended command immediately
+		 */
+		goto out;
+	case R1_STATE_PRG:
+		break;
+	default:
+		/* In all other states, it's illegal to issue HPI */
+		pr_debug("%s: HPI cannot be sent. Card state=%d\n",
+			mmc_hostname(card->host), R1_CURRENT_STATE(status));
+		err = -EINVAL;
+		goto out;
+	}
+
+	err = mmc_send_hpi_cmd(card, &status);
+	if (err)
+		goto out;
+
+	prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
+	do {
+		err = mmc_send_status(card, &status);
+
+		if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
+			break;
+		if (time_after(jiffies, prg_wait))
+			err = -ETIMEDOUT;
+	} while (!err);
+
+out:
+	mmc_release_host(card->host);
+	return err;
+}
+
 int mmc_can_ext_csd(struct mmc_card *card)
 {
 	return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
 }
 
+/**
+ *	mmc_stop_bkops - stop ongoing BKOPS
+ *	@card: MMC card to check BKOPS
+ *
+ *	Send HPI command to stop ongoing background operations to
+ *	allow rapid servicing of foreground operations, e.g. read/
+ *	writes. Wait until the card comes out of the programming state
+ *	to avoid errors in servicing read/write requests.
+ */
+int mmc_stop_bkops(struct mmc_card *card)
+{
+	int err = 0;
+
+	err = mmc_interrupt_hpi(card);
+
+	/*
+	 * If err is EINVAL, we can't issue an HPI.
+	 * It should complete the BKOPS.
+	 */
+	if (!err || (err == -EINVAL)) {
+		mmc_card_clr_doing_bkops(card);
+		mmc_retune_release(card->host);
+		err = 0;
+	}
+
+	return err;
+}
+
+static int mmc_read_bkops_status(struct mmc_card *card)
+{
+	int err;
+	u8 *ext_csd;
+
+	mmc_claim_host(card->host);
+	err = mmc_get_ext_csd(card, &ext_csd);
+	mmc_release_host(card->host);
+	if (err)
+		return err;
+
+	card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
+	card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
+	kfree(ext_csd);
+	return 0;
+}
+
+/**
+ *	mmc_start_bkops - start BKOPS for supported cards
+ *	@card: MMC card to start BKOPS
+ *	@form_exception: A flag to indicate if this function was
+ *			 called due to an exception raised by the card
+ *
+ *	Start background operations whenever requested.
+ *	When the urgent BKOPS bit is set in a R1 command response
+ *	then background operations should be started immediately.
+*/
+void mmc_start_bkops(struct mmc_card *card, bool from_exception)
+{
+	int err;
+	int timeout;
+	bool use_busy_signal;
+
+	if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
+		return;
+
+	err = mmc_read_bkops_status(card);
+	if (err) {
+		pr_err("%s: Failed to read bkops status: %d\n",
+		       mmc_hostname(card->host), err);
+		return;
+	}
+
+	if (!card->ext_csd.raw_bkops_status)
+		return;
+
+	if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
+	    from_exception)
+		return;
+
+	mmc_claim_host(card->host);
+	if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
+		timeout = MMC_OPS_TIMEOUT_MS;
+		use_busy_signal = true;
+	} else {
+		timeout = 0;
+		use_busy_signal = false;
+	}
+
+	mmc_retune_hold(card->host);
+
+	err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+			EXT_CSD_BKOPS_START, 1, timeout, 0,
+			use_busy_signal, true, false);
+	if (err) {
+		pr_warn("%s: Error %d starting bkops\n",
+			mmc_hostname(card->host), err);
+		mmc_retune_release(card->host);
+		goto out;
+	}
+
+	/*
+	 * For urgent bkops status (LEVEL_2 and more)
+	 * bkops executed synchronously, otherwise
+	 * the operation is in progress
+	 */
+	if (!use_busy_signal)
+		mmc_card_set_doing_bkops(card);
+	else
+		mmc_retune_release(card->host);
+out:
+	mmc_release_host(card->host);
+}
+
+/*
+ * Flush the cache to the non-volatile storage.
+ */
+int mmc_flush_cache(struct mmc_card *card)
+{
+	int err = 0;
+
+	if (mmc_card_mmc(card) &&
+			(card->ext_csd.cache_size > 0) &&
+			(card->ext_csd.cache_ctrl & 1)) {
+		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+				EXT_CSD_FLUSH_CACHE, 1, 0);
+		if (err)
+			pr_err("%s: cache flush error %d\n",
+					mmc_hostname(card->host), err);
+	}
+
+	return err;
+}
+EXPORT_SYMBOL(mmc_flush_cache);
+
 static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
 {
 	u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;