[PATCH 07/11] sdhci: Add set_clock callback and a quirk for nonstandard clocks

Anton Vorontsov
2009-03-16T21:15:55Z

FSL eSDHC hosts have incompatible register map to manage the SDCLK.
This patch adds set_clock callback so that drivers could overwrite
set_clock behaviour.

Similar patch[1] was posted by Ben Dooks, though in Ben's version the
callback is named change_clock, plus the patch has some unrelated bits
that makes the patch difficult to reuse.

[1] http://lkml.org/lkml/2008/12/2/160

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
---
drivers/mmc/host/sdhci.c | 6 ++++++
drivers/mmc/host/sdhci.h | 4 ++++
2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 34ab77b..75d0ecb 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -949,6 +949,12 @@ static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
if (clock == host->clock)
return;

+ if (host->ops->set_clock) {
+ host->ops->set_clock(host, clock);
+ if (host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK)
+ return;
+ }
+
sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);

if (clock == 0)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index aab0652..b9bc622 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -218,6 +218,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_BROKEN_CARD_DETECTION (1<<15)
/* Controller reports inverted write-protect state */
#define SDHCI_QUIRK_INVERTED_WRITE_PROTECT (1<<16)
+/* Controller has nonstandard clock management */
+#define SDHCI_QUIRK_NONSTANDARD_CLOCK (1<<17)

int irq; /* Device IRQ */
void __iomem * ioaddr; /* Mapped address */
@@ -284,6 +286,8 @@ struct sdhci_ops {
void (*writeb)(struct sdhci_host *host, u8 val, int reg);
#endif

+ void (*set_clock)(struct sdhci_host *host, unsigned int clock);
+
int (*enable_dma)(struct sdhci_host *host);
unsigned int (*get_max_clock)(struct sdhci_host *host);
unsigned int (*get_timeout_clock)(struct sdhci_host *host);
--
1.5.6.5