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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: Paul Walmsley <paul@pwsan.com>
This commit is contained in:
Paul Walmsley 2009-05-12 17:27:09 -06:00 committed by paul
parent fa0406a8d8
commit 98cfe5abf2
1 changed files with 18 additions and 1 deletions
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19
arch/arm/mach-omap2/sdrc.c
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@ -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);
}