Implements support for multiblock transfers bounded
by SET_BLOCK_COUNT (CMD23).
Cc: arindam.nath@xxxxxxx
Cc: cjb@xxxxxxxxxx
Cc: arnd@xxxxxxxx
Cc: malchev@xxxxxxxxxx
Signed-off-by: Andrei Warkentin <andreiw@xxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 66 ++++++++++++++++++++++++++++++++++-----------
drivers/mmc/host/sdhci.h | 2 +-
include/linux/mmc/sdhci.h | 1 +
3 files changed, 52 insertions(+), 17 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index cc63f5e..3a53512 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -838,9 +838,10 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
}
static void sdhci_set_transfer_mode(struct sdhci_host *host,
- struct mmc_data *data)
+ struct mmc_command *cmd)
{
u16 mode;
+ struct mmc_data *data = cmd->data;
if (data == NULL)
return;
@@ -848,11 +849,17 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
WARN_ON(!host->data);
mode = SDHCI_TRNS_BLK_CNT_EN;
- if (data->blocks > 1) {
- if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
- mode |= SDHCI_TRNS_MULTI | SDHCI_TRNS_ACMD12;
- else
- mode |= SDHCI_TRNS_MULTI;
+ if (mmc_op_multi(cmd->opcode) ||
+ data->blocks > 1) {
+ mode |= SDHCI_TRNS_MULTI;
+
+ /*
+ * If we are sending CMD23, CMD12 never gets sent
+ * on successful completion (so no Auto-CMD12).
+ */
+ if (!host->mrq->sbc &&
+ host->flags & SDHCI_AUTO_CMD12)
+ mode |= SDHCI_TRNS_AUTO_CMD12;
}
if (data->flags & MMC_DATA_READ)
mode |= SDHCI_TRNS_READ;
@@ -893,7 +900,15 @@ static void sdhci_finish_data(struct sdhci_host *host)
else
data->bytes_xfered = data->blksz * data->blocks;
- if (data->stop) {
+ /*
+ * Need to send CMD12 if -
+ * a) open-ended multiblock transfer (no CMD23)
+ * b) error in multiblock transfer
+ */
+ if (data->stop &&
+ (data->error ||
+ !host->mrq->sbc)) {
+
/*
* The controller needs a reset of internal state machines
* upon error conditions.
@@ -949,7 +964,7 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
- sdhci_set_transfer_mode(host, cmd->data);
+ sdhci_set_transfer_mode(host, cmd);
if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
printk(KERN_ERR "%s: Unsupported response type!\n",
@@ -1004,13 +1019,21 @@ static void sdhci_finish_command(struct sdhci_host *host)
host->cmd->error = 0;
- if (host->data && host->data_early)
- sdhci_finish_data(host);
+ /* Finished CMD23, now send actual command. */
+ if (host->cmd == host->mrq->sbc) {
+ host->cmd = NULL;
+ sdhci_send_command(host, host->mrq->cmd);
+ } else {
- if (!host->cmd->data)
- tasklet_schedule(&host->finish_tasklet);
+ /* Processed actual command. */
+ if (host->data && host->data_early)
+ sdhci_finish_data(host);
- host->cmd = NULL;
+ if (!host->cmd->data)
+ tasklet_schedule(&host->finish_tasklet);
+
+ host->cmd = NULL;
+ }
}
static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
@@ -1189,7 +1212,12 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
#ifndef SDHCI_USE_LEDS_CLASS
sdhci_activate_led(host);
#endif
- if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) {
+
+ /*
+ * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
+ * requests if Auto-CMD12 is enabled.
+ */
+ if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
if (mrq->stop) {
mrq->data->stop = NULL;
mrq->stop = NULL;
@@ -1227,7 +1255,10 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
host->mrq = mrq;
}
- sdhci_send_command(host, mrq->cmd);
+ if (mrq->sbc)
+ sdhci_send_command(host, mrq->sbc);
+ else
+ sdhci_send_command(host, mrq->cmd);
}
mmiowb();
@@ -2455,7 +2486,10 @@ int sdhci_add_host(struct sdhci_host *host)
} else
mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
- mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE;
+ mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
+
+ if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
+ host->flags |= SDHCI_AUTO_CMD12;
/*
* A controller may support 8-bit width, but the board itself
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 7e28eec..2c3fbc5 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -36,7 +36,7 @@
#define SDHCI_TRANSFER_MODE 0x0C
#define SDHCI_TRNS_DMA 0x01
#define SDHCI_TRNS_BLK_CNT_EN 0x02
-#define SDHCI_TRNS_ACMD12 0x04
+#define SDHCI_TRNS_AUTO_CMD12 0x04
#define SDHCI_TRNS_READ 0x10
#define SDHCI_TRNS_MULTI 0x20
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index e902618..73e27ba 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -113,6 +113,7 @@ struct sdhci_host {
#define SDHCI_DEVICE_DEAD (1<<3) /* Device unresponsive */
#define SDHCI_SDR50_NEEDS_TUNING (1<<4) /* SDR50 needs tuning */
#define SDHCI_NEEDS_RETUNING (1<<5) /* Host needs retuning */
+#define SDHCI_AUTO_CMD12 (1<<6) /* Auto CMD12 support */
unsigned int version; /* SDHCI spec. version */
--
1.7.0.4
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