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Subject[PATCH V2 1/7] mmc: sdhci: add sd host v4 mode
Date
For SD host controller version 4.00 or later ones, there're two
modes of implementation - Version 3.00 compatible mode or
Version 4 mode. This patch introduces a flag to record this.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
---
drivers/mmc/host/sdhci.c | 6 ++++++
drivers/mmc/host/sdhci.h | 6 ++++++
2 files changed, 12 insertions(+)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 2ededa7f..cf5695f 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3302,6 +3302,12 @@ void __sdhci_read_caps(struct sdhci_host *host, u16 *ver, u32 *caps, u32 *caps1)
v = ver ? *ver : sdhci_readw(host, SDHCI_HOST_VERSION);
host->version = (v & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;

+ if (host->version >= SDHCI_SPEC_400) {
+ if (sdhci_readw(host, SDHCI_HOST_CONTROL2) &
+ SDHCI_CTRL_V4_MODE)
+ host->v4_mode = true;
+ }
+
if (host->quirks & SDHCI_QUIRK_MISSING_CAPS)
return;

diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index c95b0a4..128b0ba 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -184,6 +184,7 @@
#define SDHCI_CTRL_DRV_TYPE_D 0x0030
#define SDHCI_CTRL_EXEC_TUNING 0x0040
#define SDHCI_CTRL_TUNED_CLK 0x0080
+#define SDHCI_CTRL_V4_MODE 0x1000
#define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000

#define SDHCI_CAPABILITIES 0x40
@@ -270,6 +271,8 @@
#define SDHCI_SPEC_100 0
#define SDHCI_SPEC_200 1
#define SDHCI_SPEC_300 2
+#define SDHCI_SPEC_400 3
+#define SDHCI_SPEC_410 4

/*
* End of controller registers.
@@ -551,6 +554,9 @@ struct sdhci_host {
u32 sdma_boundary;

unsigned long private[0] ____cacheline_aligned;
+
+ /* Host Version 4 Enable */
+ bool v4_mode;
};

struct sdhci_ops {
--
2.7.4
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