lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

OMAP3 SDRC: initialize SDRC_POWER at boot

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

19
arch/arm/mach-omap2/sdrc.c
View File

@@ -37,6 +37,10 @@ static struct omap_sdrc_params *sdrc_init_params;
void __iomem *omap2_sdrc_base; void __iomem *omap2_sdrc_base;
void __iomem *omap2_sms_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 * 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; 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) void __init omap2_sdrc_init(struct omap_sdrc_params *sp)
{ {
u32 l; u32 l;
@@ -90,4 +101,10 @@ void __init omap2_sdrc_init(struct omap_sdrc_params *sp)
sdrc_write_reg(l, SDRC_SYSCONFIG); sdrc_write_reg(l, SDRC_SYSCONFIG);
sdrc_init_params = sp; 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);
} }