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authorAnton Vorontsov <avorontsov@ru.mvista.com>2009-03-17 00:13:59 +0300
committerPierre Ossman <drzeus@drzeus.cx>2009-03-24 23:30:09 +0300
commit8114634ccb54d67a8c01e5825d95bff4e7f7b357 (patch)
treee80edf6881a8366fadbd4ec06574af8ab6306c24 /drivers/mmc
parent4240ff0a02cb52f7d10dc1df6d82ba9c27dba07b (diff)
downloadlinux-8114634ccb54d67a8c01e5825d95bff4e7f7b357.tar.xz
sdhci: Add set_clock callback and a quirk for nonstandard clocks
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> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci.c6
-rw-r--r--drivers/mmc/host/sdhci.h4
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 34ab77bd12ae..75d0ecbce10c 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 aab0652a4585..b9bc622735ba 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);