Commit 8114634c authored by Anton Vorontsov's avatar Anton Vorontsov Committed by Pierre Ossman
Browse files

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: default avatarAnton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent 4240ff0a

drivers/mmc/host/sdhci.c

+6 −0
Original line number Diff line number Diff line
@@ -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)

drivers/mmc/host/sdhci.h

+4 −0
Original line number Diff line number Diff line
@@ -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);

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