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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.c186
1 files changed, 166 insertions, 20 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 772d0d0..2a7e43b 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -20,6 +20,7 @@
#include "core.h"
#include "bus.h"
#include "mmc_ops.h"
+#include "sd_ops.h"
static const unsigned int tran_exp[] = {
10000, 100000, 1000000, 10000000,
@@ -173,14 +174,17 @@ static int mmc_decode_csd(struct mmc_card *card)
}
/*
- * Read and decode extended CSD.
+ * Read extended CSD.
*/
-static int mmc_read_ext_csd(struct mmc_card *card)
+static int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
{
int err;
u8 *ext_csd;
BUG_ON(!card);
+ BUG_ON(!new_ext_csd);
+
+ *new_ext_csd = NULL;
if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
return 0;
@@ -198,12 +202,15 @@ static int mmc_read_ext_csd(struct mmc_card *card)
err = mmc_send_ext_csd(card, ext_csd);
if (err) {
+ kfree(ext_csd);
+ *new_ext_csd = NULL;
+
/* If the host or the card can't do the switch,
* fail more gracefully. */
if ((err != -EINVAL)
&& (err != -ENOSYS)
&& (err != -EFAULT))
- goto out;
+ return err;
/*
* High capacity cards should have this "magic" size
@@ -221,9 +228,23 @@ static int mmc_read_ext_csd(struct mmc_card *card)
mmc_hostname(card->host));
err = 0;
}
+ } else
+ *new_ext_csd = ext_csd;
- goto out;
- }
+ return err;
+}
+
+/*
+ * Decode extended CSD.
+ */
+static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
+{
+ int err = 0;
+
+ BUG_ON(!card);
+
+ if (!ext_csd)
+ return 0;
/* Version is coded in the CSD_STRUCTURE byte in the EXT_CSD register */
if (card->csd.structure == 3) {
@@ -288,6 +309,10 @@ static int mmc_read_ext_csd(struct mmc_card *card)
if (card->ext_csd.rev >= 3) {
u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
+ card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
+
+ /* EXT_CSD value is in units of 10ms, but we store in ms */
+ card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
/* Sleep / awake timeout in 100ns units */
if (sa_shift > 0 && sa_shift <= 0x17)
@@ -299,6 +324,14 @@ static int mmc_read_ext_csd(struct mmc_card *card)
ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
card->ext_csd.hc_erase_size =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] << 10;
+
+ card->ext_csd.rel_sectors = ext_csd[EXT_CSD_REL_WR_SEC_C];
+
+ /*
+ * There are two boot regions of equal size, defined in
+ * multiples of 128K.
+ */
+ card->ext_csd.boot_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
}
if (card->ext_csd.rev >= 4) {
@@ -350,14 +383,78 @@ static int mmc_read_ext_csd(struct mmc_card *card)
ext_csd[EXT_CSD_TRIM_MULT];
}
+ if (card->ext_csd.rev >= 5)
+ card->ext_csd.rel_param = ext_csd[EXT_CSD_WR_REL_PARAM];
+
if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
card->erased_byte = 0xFF;
else
card->erased_byte = 0x0;
out:
+ return err;
+}
+
+static inline void mmc_free_ext_csd(u8 *ext_csd)
+{
kfree(ext_csd);
+}
+
+
+static int mmc_compare_ext_csds(struct mmc_card *card, u8 *ext_csd,
+ unsigned bus_width)
+{
+ u8 *bw_ext_csd;
+ int err;
+
+ err = mmc_get_ext_csd(card, &bw_ext_csd);
+ if (err)
+ return err;
+
+ if ((ext_csd == NULL || bw_ext_csd == NULL)) {
+ if (bus_width != MMC_BUS_WIDTH_1)
+ err = -EINVAL;
+ goto out;
+ }
+ if (bus_width == MMC_BUS_WIDTH_1)
+ goto out;
+
+ /* only compare read only fields */
+ err = (!(ext_csd[EXT_CSD_PARTITION_SUPPORT] ==
+ bw_ext_csd[EXT_CSD_PARTITION_SUPPORT]) &&
+ (ext_csd[EXT_CSD_ERASED_MEM_CONT] ==
+ bw_ext_csd[EXT_CSD_ERASED_MEM_CONT]) &&
+ (ext_csd[EXT_CSD_REV] ==
+ bw_ext_csd[EXT_CSD_REV]) &&
+ (ext_csd[EXT_CSD_STRUCTURE] ==
+ bw_ext_csd[EXT_CSD_STRUCTURE]) &&
+ (ext_csd[EXT_CSD_CARD_TYPE] ==
+ bw_ext_csd[EXT_CSD_CARD_TYPE]) &&
+ (ext_csd[EXT_CSD_S_A_TIMEOUT] ==
+ bw_ext_csd[EXT_CSD_S_A_TIMEOUT]) &&
+ (ext_csd[EXT_CSD_HC_WP_GRP_SIZE] ==
+ bw_ext_csd[EXT_CSD_HC_WP_GRP_SIZE]) &&
+ (ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT] ==
+ bw_ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT]) &&
+ (ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] ==
+ bw_ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]) &&
+ (ext_csd[EXT_CSD_SEC_TRIM_MULT] ==
+ bw_ext_csd[EXT_CSD_SEC_TRIM_MULT]) &&
+ (ext_csd[EXT_CSD_SEC_ERASE_MULT] ==
+ bw_ext_csd[EXT_CSD_SEC_ERASE_MULT]) &&
+ (ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT] ==
+ bw_ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT]) &&
+ (ext_csd[EXT_CSD_TRIM_MULT] ==
+ bw_ext_csd[EXT_CSD_TRIM_MULT]) &&
+ memcmp(&ext_csd[EXT_CSD_SEC_CNT],
+ &bw_ext_csd[EXT_CSD_SEC_CNT],
+ 4) != 0);
+ if (err)
+ err = -EINVAL;
+
+out:
+ mmc_free_ext_csd(bw_ext_csd);
return err;
}
@@ -422,6 +519,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
u32 cid[4];
unsigned int max_dtr;
u32 rocr;
+ u8 *ext_csd = NULL;
BUG_ON(!host);
WARN_ON(!host->claimed);
@@ -520,7 +618,11 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
/*
* Fetch and process extended CSD.
*/
- err = mmc_read_ext_csd(card);
+
+ err = mmc_get_ext_csd(card, &ext_csd);
+ if (err)
+ goto free_card;
+ err = mmc_read_ext_csd(card, ext_csd);
if (err)
goto free_card;
@@ -542,7 +644,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
*/
if (card->ext_csd.enhanced_area_en) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_ERASE_GROUP_DEF, 1);
+ EXT_CSD_ERASE_GROUP_DEF, 1, 0);
if (err && err != -EBADMSG)
goto free_card;
@@ -568,12 +670,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
}
/*
+ * Ensure eMMC user default partition is enabled
+ */
+ if (card->ext_csd.part_config & EXT_CSD_PART_CONFIG_ACC_MASK) {
+ card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONFIG,
+ card->ext_csd.part_config,
+ card->ext_csd.part_time);
+ if (err && err != -EBADMSG)
+ goto free_card;
+ }
+
+ /*
* Activate high speed (if supported)
*/
if ((card->ext_csd.hs_max_dtr != 0) &&
(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_HS_TIMING, 1);
+ EXT_CSD_HS_TIMING, 1, 0);
if (err && err != -EBADMSG)
goto free_card;
@@ -606,10 +720,14 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
*/
if (mmc_card_highspeed(card)) {
if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
- && (host->caps & (MMC_CAP_1_8V_DDR)))
+ && ((host->caps & (MMC_CAP_1_8V_DDR |
+ MMC_CAP_UHS_DDR50))
+ == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
ddr = MMC_1_8V_DDR_MODE;
else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
- && (host->caps & (MMC_CAP_1_2V_DDR)))
+ && ((host->caps & (MMC_CAP_1_2V_DDR |
+ MMC_CAP_UHS_DDR50))
+ == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
ddr = MMC_1_2V_DDR_MODE;
}
@@ -640,18 +758,22 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
ddr = 0; /* no DDR for 1-bit width */
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH,
- ext_csd_bits[idx][0]);
+ ext_csd_bits[idx][0],
+ 0);
if (!err) {
- mmc_set_bus_width_ddr(card->host,
- bus_width, MMC_SDR_MODE);
+ mmc_set_bus_width(card->host, bus_width);
+
/*
* If controller can't handle bus width test,
- * use the highest bus width to maintain
- * compatibility with previous MMC behavior.
+ * compare ext_csd previously read in 1 bit mode
+ * against ext_csd at new bus width
*/
if (!(host->caps & MMC_CAP_BUS_WIDTH_TEST))
- break;
- err = mmc_bus_test(card, bus_width);
+ err = mmc_compare_ext_csds(card,
+ ext_csd,
+ bus_width);
+ else
+ err = mmc_bus_test(card, bus_width);
if (!err)
break;
}
@@ -659,8 +781,9 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
if (!err && ddr) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_BUS_WIDTH,
- ext_csd_bits[idx][1]);
+ EXT_CSD_BUS_WIDTH,
+ ext_csd_bits[idx][1],
+ 0);
}
if (err) {
printk(KERN_WARNING "%s: switch to bus width %d ddr %d "
@@ -668,20 +791,43 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
1 << bus_width, ddr);
goto free_card;
} else if (ddr) {
+ /*
+ * eMMC cards can support 3.3V to 1.2V i/o (vccq)
+ * signaling.
+ *
+ * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
+ *
+ * 1.8V vccq at 3.3V core voltage (vcc) is not required
+ * in the JEDEC spec for DDR.
+ *
+ * Do not force change in vccq since we are obviously
+ * working and no change to vccq is needed.
+ *
+ * WARNING: eMMC rules are NOT the same as SD DDR
+ */
+ if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
+ err = mmc_set_signal_voltage(host,
+ MMC_SIGNAL_VOLTAGE_120, 0);
+ if (err)
+ goto err;
+ }
mmc_card_set_ddr_mode(card);
- mmc_set_bus_width_ddr(card->host, bus_width, ddr);
+ mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
+ mmc_set_bus_width(card->host, bus_width);
}
}
if (!oldcard)
host->card = card;
+ mmc_free_ext_csd(ext_csd);
return 0;
free_card:
if (!oldcard)
mmc_remove_card(card);
err:
+ mmc_free_ext_csd(ext_csd);
return err;
}