Commit 98cfe5ab authored by Paul Walmsley's avatar Paul Walmsley Committed by paul
Browse files

OMAP3 SDRC: initialize SDRC_POWER at boot 



Initialize SDRC_POWER to a known-good setting when the kernel boots.
Necessary since some bootloaders don't initialize SDRC_POWER properly.

Signed-off-by: default avatarPaul Walmsley <paul@pwsan.com>
parent fa0406a8

arch/arm/mach-omap2/sdrc.c

+18 −1
Original line number Diff line number Diff line
@@ -37,6 +37,10 @@ static struct omap_sdrc_params *sdrc_init_params; 
void __iomem *omap2_sdrc_base;

void __iomem *omap2_sms_base;



/* SDRC_POWER register bits */

#define SDRC_POWER_EXTCLKDIS_SHIFT		3

#define SDRC_POWER_PWDENA_SHIFT			2

#define SDRC_POWER_PAGEPOLICY_SHIFT		0



/**

 * omap2_sdrc_get_params - return SDRC register values for a given clock rate
@@ -74,7 +78,14 @@ void __init omap2_set_globals_sdrc(struct omap_globals *omap2_globals) 
	omap2_sms_base = omap2_globals->sms;

}



/* turn on smart idle modes for SDRAM scheduler and controller */

/**

 * omap2_sdrc_init - initialize SMS, SDRC devices on boot

 * @sp: pointer to a null-terminated list of struct omap_sdrc_params

 *

 * Turn on smart idle modes for SDRAM scheduler and controller.

 * Program a known-good configuration for the SDRC to deal with buggy

 * bootloaders.

 */

void __init omap2_sdrc_init(struct omap_sdrc_params *sp)

{

	u32 l;
@@ -90,4 +101,10 @@ void __init omap2_sdrc_init(struct omap_sdrc_params *sp) 
	sdrc_write_reg(l, SDRC_SYSCONFIG);



	sdrc_init_params = sp;



	/* XXX Enable SRFRONIDLEREQ here also? */

	l = (1 << SDRC_POWER_EXTCLKDIS_SHIFT) |

		(1 << SDRC_POWER_PWDENA_SHIFT) |

		(1 << SDRC_POWER_PAGEPOLICY_SHIFT);

	sdrc_write_reg(l, SDRC_POWER);

}