MMC core learns about SPI

Teach the MMC/SD/SDIO core about using SPI mode.

 - Use mmc_host_is_spi() so enumeration works through SPI signaling
   and protocols, not just the native versions.

 - Provide the SPI response type flags with each request issued,
   including requests from the new lock/unlock code.

 - Understand that cmd->resp[0] and mmc_get_status() results for SPI
   return different values than for "native" MMC/SD protocol; this
   affects resetting, checking card lock status, and some others.

 - Understand that some commands act a bit differently ... notably:
     * OP_COND command doesn't return the OCR
     * APP_CMD status doesn't have an R1_APP_CMD analogue

Those changes required some new and updated primitives:

 - Provide utilities to access two SPI-only requests, and one
   request that wasn't previously needed:
     * mmc_spi_read_ocr() ... SPI only
     * mmc_spi_set_crc() ... SPI only (override by module parm)
     * mmc_send_cid() ... for use without broadcast mode

 - Updated internal routines:
     * Previous mmc_send_csd() modified into mmc_send_cxd_native();
       it uses native "R2" responses, which include 16 bytes of data.
     * Previous mmc_send_ext_csd() becomes new mmc_send_cxd_data()
       helper for command-and-data access
     * Bugfix to that mmc_send_cxd_data() code:  dma-to-stack is
       unsafe/nonportable, so kmalloc a bounce buffer instead.

 - Modified mmc_send_ext_csd() now uses mmc_send_cxd_data() helper

 - Modified mmc_send_csd(), and new mmc_spi_send_cid(), routines use
   those helper routines based on whether they're native or SPI

The newest categories of cards supported by the MMC stack aren't expected
to work yet with SPI:  MMC or SD cards with over 4GB data, and SDIO.
All those cards support SPI mode, so eventually they should work too.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 38 insertions, 10 deletions

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index c86588fdaae5..d1c1e0f592f1 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -323,9 +323,21 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 		goto err;
 
 	/*
+	 * For SPI, enable CRC as appropriate.
+	 */
+	if (mmc_host_is_spi(host)) {
+		err = mmc_spi_set_crc(host, use_spi_crc);
+		if (err)
+			goto err;
+	}
+
+	/*
 	 * Fetch CID from card.
 	 */
-	err = mmc_all_send_cid(host, cid);
+	if (mmc_host_is_spi(host))
+		err = mmc_send_cid(host, cid);
+	else
+		err = mmc_all_send_cid(host, cid);
 	if (err)
 		goto err;
 
@@ -351,13 +363,15 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 	}
 
 	/*
-	 * Set card RCA.
+	 * For native busses:  get card RCA and quit open drain mode.
 	 */
-	err = mmc_send_relative_addr(host, &card->rca);
-	if (err)
-		goto free_card;
+	if (!mmc_host_is_spi(host)) {
+		err = mmc_send_relative_addr(host, &card->rca);
+		if (err)
+			goto free_card;
 
-	mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+		mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+	}
 
 	if (!oldcard) {
 		/*
@@ -377,9 +391,11 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
 	/*
 	 * Select card, as all following commands rely on that.
 	 */
-	err = mmc_select_card(card);
-	if (err)
-		goto free_card;
+	if (!mmc_host_is_spi(host)) {
+		err = mmc_select_card(card);
+		if (err)
+			goto free_card;
+	}
 
 	if (!oldcard) {
 		/*
@@ -562,7 +578,8 @@ static void mmc_sd_suspend(struct mmc_host *host)
 	BUG_ON(!host->card);
 
 	mmc_claim_host(host);
-	mmc_deselect_cards(host);
+	if (!mmc_host_is_spi(host))
+		mmc_deselect_cards(host);
 	host->card->state &= ~MMC_STATE_HIGHSPEED;
 	mmc_release_host(host);
 }
@@ -623,6 +640,17 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 	mmc_attach_bus(host, &mmc_sd_ops);
 
 	/*
+	 * We need to get OCR a different way for SPI.
+	 */
+	if (mmc_host_is_spi(host)) {
+		mmc_go_idle(host);
+
+		err = mmc_spi_read_ocr(host, 0, &ocr);
+		if (err)
+			goto err;
+	}
+
+	/*
 	 * Sanity check the voltages that the card claims to
 	 * support.
 	 */