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>
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 733ac95..8d6f601 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -243,10 +243,17 @@
break;
}
- printk(KERN_INFO "%s: new %s%s card at address %04x\n",
- mmc_hostname(card->host),
- mmc_card_highspeed(card) ? "high speed " : "",
- type, card->rca);
+ if (mmc_host_is_spi(card->host)) {
+ printk(KERN_INFO "%s: new %s%s card on SPI\n",
+ mmc_hostname(card->host),
+ mmc_card_highspeed(card) ? "high speed " : "",
+ type);
+ } else {
+ printk(KERN_INFO "%s: new %s%s card at address %04x\n",
+ mmc_hostname(card->host),
+ mmc_card_highspeed(card) ? "high speed " : "",
+ type, card->rca);
+ }
card->dev.uevent_suppress = 1;
@@ -278,8 +285,13 @@
void mmc_remove_card(struct mmc_card *card)
{
if (mmc_card_present(card)) {
- printk(KERN_INFO "%s: card %04x removed\n",
- mmc_hostname(card->host), card->rca);
+ if (mmc_host_is_spi(card->host)) {
+ printk(KERN_INFO "%s: SPI card removed\n",
+ mmc_hostname(card->host));
+ } else {
+ printk(KERN_INFO "%s: card %04x removed\n",
+ mmc_hostname(card->host), card->rca);
+ }
if (card->host->bus_ops->sysfs_remove)
card->host->bus_ops->sysfs_remove(card->host, card);