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authorDavid Brownell <david-b@pacbell.net>2007-08-08 09:11:32 -0700
committerPierre Ossman <drzeus@drzeus.cx>2007-09-23 21:51:30 +0200
commitaf51715079e7fb6b290e1881d63d815dc4de5011 (patch)
tree324e81b2346955f130dda8515f2ad4f4ce97c864 /drivers/mmc/core/mmc.c
parent7213d175e3b6f6db60f843b72e88857a350e146a (diff)
downloadlinux-af51715079e7fb6b290e1881d63d815dc4de5011.tar.bz2
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>
Diffstat (limited to 'drivers/mmc/core/mmc.c')
-rw-r--r--drivers/mmc/core/mmc.c50
1 files changed, 37 insertions, 13 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 6ba458951d24..65fe28860f54 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -165,8 +165,6 @@ static int mmc_read_ext_csd(struct mmc_card *card)
BUG_ON(!card);
- err = -EIO;
-
if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
return 0;
@@ -280,9 +278,21 @@ static int mmc_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;
@@ -309,13 +319,15 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
}
/*
- * Set card RCA.
+ * For native busses: set card RCA and quit open drain mode.
*/
- err = mmc_set_relative_addr(card);
- if (err)
- goto free_card;
+ if (!mmc_host_is_spi(host)) {
+ err = mmc_set_relative_addr(card);
+ if (err)
+ goto free_card;
- mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+ mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+ }
if (!oldcard) {
/*
@@ -336,13 +348,15 @@ static int mmc_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) {
/*
- * Fetch and process extened CSD.
+ * Fetch and process extended CSD.
*/
err = mmc_read_ext_csd(card);
if (err)
@@ -502,7 +516,8 @@ static void mmc_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);
}
@@ -563,6 +578,15 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
mmc_attach_bus(host, &mmc_ops);
/*
+ * We need to get OCR a different way for SPI.
+ */
+ if (mmc_host_is_spi(host)) {
+ err = mmc_spi_read_ocr(host, 1, &ocr);
+ if (err)
+ goto err;
+ }
+
+ /*
* Sanity check the voltages that the card claims to
* support.
*/