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Subject[PATCH V2 5/7] mmc: sdhci: add CMD23 support for v4 mode
Date
Host Driver Version 4.10 adds a new bit in Host Control 2 Register
for selecting Auto CMD23 or Auto CMD12 for ADMA3 data transfer.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
---
drivers/mmc/host/sdhci.c | 16 +++++++++++++++-
drivers/mmc/host/sdhci.h | 1 +
2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b8ee124..3b2af7e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -954,6 +954,20 @@ static inline bool sdhci_auto_cmd12(struct sdhci_host *host,
!mrq->cap_cmd_during_tfr;
}

+static inline void sdhci_set_auto_cmd23(struct sdhci_host *host,
+ struct mmc_command *cmd)
+{
+ u16 ctrl2;
+
+ if (host->v4_mode) {
+ ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ ctrl2 |= SDHCI_CMD23_ENABLE;
+ sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
+ } else {
+ sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
+ }
+}
+
static void sdhci_set_transfer_mode(struct sdhci_host *host,
struct mmc_command *cmd)
{
@@ -989,7 +1003,7 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
mode |= SDHCI_TRNS_AUTO_CMD12;
else if (cmd->mrq->sbc && (host->flags & SDHCI_AUTO_CMD23)) {
mode |= SDHCI_TRNS_AUTO_CMD23;
- sdhci_writel(host, cmd->mrq->sbc->arg, SDHCI_ARGUMENT2);
+ sdhci_set_auto_cmd23(host, cmd);
}
}

diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 1e84539..d5e1c10 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -185,6 +185,7 @@
#define SDHCI_CTRL_DRV_TYPE_D 0x0030
#define SDHCI_CTRL_EXEC_TUNING 0x0040
#define SDHCI_CTRL_TUNED_CLK 0x0080
+#define SDHCI_CMD23_ENABLE 0x0800
#define SDHCI_CTRL_V4_MODE 0x1000
#define SDHCI_CTRL_64BIT_ADDR 0x2000
#define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000
--
2.7.4
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