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path: root/drivers/mmc/core/mmc.c
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Diffstat (limited to 'drivers/mmc/core/mmc.c')
-rw-r--r--drivers/mmc/core/mmc.c134
1 files changed, 90 insertions, 44 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 21d7f48e1d4e..65fe28860f54 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -161,13 +161,12 @@ static int mmc_read_ext_csd(struct mmc_card *card)
{
int err;
u8 *ext_csd;
+ unsigned int ext_csd_struct;
BUG_ON(!card);
- err = MMC_ERR_FAILED;
-
if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
- return MMC_ERR_NONE;
+ return 0;
/*
* As the ext_csd is so large and mostly unused, we don't store the
@@ -176,13 +175,19 @@ static int mmc_read_ext_csd(struct mmc_card *card)
ext_csd = kmalloc(512, GFP_KERNEL);
if (!ext_csd) {
printk(KERN_ERR "%s: could not allocate a buffer to "
- "receive the ext_csd. mmc v4 cards will be "
- "treated as v3.\n", mmc_hostname(card->host));
- return MMC_ERR_FAILED;
+ "receive the ext_csd.\n", mmc_hostname(card->host));
+ return -ENOMEM;
}
err = mmc_send_ext_csd(card, ext_csd);
- if (err != MMC_ERR_NONE) {
+ if (err) {
+ /*
+ * We all hosts that cannot perform the command
+ * to fail more gracefully
+ */
+ if (err != -EINVAL)
+ goto out;
+
/*
* High capacity cards should have this "magic" size
* stored in their CSD.
@@ -197,18 +202,29 @@ static int mmc_read_ext_csd(struct mmc_card *card)
"EXT_CSD, performance might "
"suffer.\n",
mmc_hostname(card->host));
- err = MMC_ERR_NONE;
+ err = 0;
}
+
goto out;
}
- card->ext_csd.sectors =
- ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
- ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
- ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
- ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
- if (card->ext_csd.sectors)
- mmc_card_set_blockaddr(card);
+ ext_csd_struct = ext_csd[EXT_CSD_REV];
+ if (ext_csd_struct > 2) {
+ printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
+ "version %d\n", mmc_hostname(card->host),
+ ext_csd_struct);
+ return -EINVAL;
+ }
+
+ if (ext_csd_struct >= 2) {
+ card->ext_csd.sectors =
+ ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
+ ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
+ ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
+ ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
+ if (card->ext_csd.sectors)
+ mmc_card_set_blockaddr(card);
+ }
switch (ext_csd[EXT_CSD_CARD_TYPE]) {
case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
@@ -246,7 +262,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
unsigned int max_dtr;
BUG_ON(!host);
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
/*
* Since we're changing the OCR value, we seem to
@@ -258,19 +274,33 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
/* The extra bit indicates that we support high capacity */
err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
- if (err != MMC_ERR_NONE)
+ if (err)
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 (err != MMC_ERR_NONE)
+ if (mmc_host_is_spi(host))
+ err = mmc_send_cid(host, cid);
+ else
+ err = mmc_all_send_cid(host, cid);
+ if (err)
goto err;
if (oldcard) {
- if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
+ if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
+ err = -ENOENT;
goto err;
+ }
card = oldcard;
} else {
@@ -278,8 +308,10 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
* Allocate card structure.
*/
card = mmc_alloc_card(host);
- if (IS_ERR(card))
+ if (IS_ERR(card)) {
+ err = PTR_ERR(card);
goto err;
+ }
card->type = MMC_TYPE_MMC;
card->rca = 1;
@@ -287,43 +319,47 @@ 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 != MMC_ERR_NONE)
- 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) {
/*
* Fetch CSD from card.
*/
err = mmc_send_csd(card, card->raw_csd);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
err = mmc_decode_csd(card);
- if (err < 0)
+ if (err)
goto free_card;
err = mmc_decode_cid(card);
- if (err < 0)
+ if (err)
goto free_card;
}
/*
* Select card, as all following commands rely on that.
*/
- err = mmc_select_card(card);
- if (err != MMC_ERR_NONE)
- 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 != MMC_ERR_NONE)
+ if (err)
goto free_card;
}
@@ -334,7 +370,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, 1);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
mmc_card_set_highspeed(card);
@@ -363,7 +399,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
(host->caps & MMC_CAP_4_BIT_DATA)) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
@@ -372,14 +408,14 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
if (!oldcard)
host->card = card;
- return MMC_ERR_NONE;
+ return 0;
free_card:
if (!oldcard)
mmc_remove_card(card);
err:
- return MMC_ERR_FAILED;
+ return err;
}
/*
@@ -413,7 +449,7 @@ static void mmc_detect(struct mmc_host *host)
mmc_release_host(host);
- if (err != MMC_ERR_NONE) {
+ if (err) {
mmc_remove(host);
mmc_claim_host(host);
@@ -480,7 +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);
}
@@ -502,7 +539,7 @@ static void mmc_resume(struct mmc_host *host)
err = mmc_init_card(host, host->ocr, host->card);
mmc_release_host(host);
- if (err != MMC_ERR_NONE) {
+ if (err) {
mmc_remove(host);
mmc_claim_host(host);
@@ -536,11 +573,20 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
int err;
BUG_ON(!host);
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
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.
*/
@@ -565,7 +611,7 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
* Detect and init the card.
*/
err = mmc_init_card(host, host->ocr, NULL);
- if (err != MMC_ERR_NONE)
+ if (err)
goto err;
mmc_release_host(host);
@@ -587,6 +633,6 @@ err:
printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
mmc_hostname(host), err);
- return 0;
+ return err;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.