Implements support for multiblock transfers bounded
by SET_BLOCK_COUNT (CMD23).
Cc: arindam.n...@amd.com
Cc: c...@laptop.org
Cc: a...@arndb.de
Signed-off-by: Andrei Warkentin <andr...@motorola.com>
---
drivers/mmc/host/sdhci.c | 60 +++++++++++++++++++++++++++++++++------------
1 files changed, 44 insertions(+), 16 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 94793f2..0b71ce8 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -822,9 +822,10 @@ 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;
@@ -832,11 +833,17 @@ 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.
+ */
+ if (!host->mrq->sbc &&
+ host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
+ mode |= SDHCI_TRNS_ACMD12;
}
if (data->flags & MMC_DATA_READ)
mode |= SDHCI_TRNS_READ;
@@ -877,7 +884,15 @@ 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.
@@ -933,7 +948,7 @@ 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",
@@ -986,13 +1001,21 @@ 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)
@@ -1159,8 +1182,13 @@ static void sdhci_request(struct mmc_host *mmc, struct
mmc_request *mrq)
if (!present || host->flags & SDHCI_DEVICE_DEAD) {
host->mrq->cmd->error = -ENOMEDIUM;
tasklet_schedule(&host->finish_tasklet);
- } else
- sdhci_send_command(host, mrq->cmd);
+ } else {
+
+ if (mrq->sbc)
+ sdhci_send_command(host, mrq->sbc);
+ else
+ sdhci_send_command(host, mrq->cmd);
+ }
mmiowb();
spin_unlock_irqrestore(&host->lock, flags);
@@ -1909,7 +1937,7 @@ int sdhci_add_host(struct sdhci_host *host)
mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
mmc->f_max = host->max_clk;
- mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE;
+ mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
/*
* A controller may support 8-bit width, but the board itself
--
1.7.0.4
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