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ARM: OMAP: SMS: save/restore of SMS_SYSCONFIG for off-mode

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The SMS_SYSCONFIG register gets reset in off mode, added a
save/restore mechanism for that.

Signed-off-by: Kalle Jokiniemi <kalle.jokiniemi@digia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Kalle Jokiniemi 2009-05-13 13:32:11 +03:00 committed by Kevin Hilman
parent ba50ea7eb9
commit 8a917d2fc8
3 changed files with 30 additions and 0 deletions
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1
arch/arm/mach-omap2/pm34xx.c
View File

@ -399,6 +399,7 @@ static void omap_sram_idle(void)
omap3_core_restore_context();
omap3_prcm_restore_context();
omap3_sram_restore_context();
omap2_sms_restore_context();
}
if (per_next_state < PWRDM_POWER_ON) {
per_prev_state =

27
arch/arm/mach-omap2/sdrc.c
View File

@ -37,11 +37,37 @@ static struct omap_sdrc_params *sdrc_init_params_cs0, *sdrc_init_params_cs1;
void __iomem *omap2_sdrc_base;
void __iomem *omap2_sms_base;
struct omap2_sms_regs {
u32 sms_sysconfig;
};
static struct omap2_sms_regs sms_context;
/* SDRC_POWER register bits */
#define SDRC_POWER_EXTCLKDIS_SHIFT 3
#define SDRC_POWER_PWDENA_SHIFT 2
#define SDRC_POWER_PAGEPOLICY_SHIFT 0
/**
* omap2_sms_save_context - Save SMS registers
*
* Save SMS registers that need to be restored after off mode.
*/
void omap2_sms_save_context(void)
{
sms_context.sms_sysconfig = sms_read_reg(SMS_SYSCONFIG);
}
/**
* omap2_sms_restore_context - Restore SMS registers
*
* Restore SMS registers that need to be Restored after off mode.
*/
void omap2_sms_restore_context(void)
{
sms_write_reg(sms_context.sms_sysconfig, SMS_SYSCONFIG);
}
/**
* omap2_sdrc_get_params - return SDRC register values for a given clock rate
* @r: SDRC clock rate (in Hz)
@ -132,4 +158,5 @@ void __init omap2_sdrc_init(struct omap_sdrc_params *sdrc_cs0,
l = (1 << SDRC_POWER_EXTCLKDIS_SHIFT) |
(1 << SDRC_POWER_PAGEPOLICY_SHIFT);
sdrc_write_reg(l, SDRC_POWER);
omap2_sms_save_context();
}

2
arch/arm/plat-omap/include/plat/sdrc.h
View File

@ -120,6 +120,8 @@ void __init omap2_sdrc_init(struct omap_sdrc_params *sdrc_cs0,
int omap2_sdrc_get_params(unsigned long r,
struct omap_sdrc_params **sdrc_cs0,
struct omap_sdrc_params **sdrc_cs1);
void omap2_sms_save_context(void);
void omap2_sms_restore_context(void);
#ifdef CONFIG_ARCH_OMAP2