diff options
Diffstat (limited to 'arch/arm/mach-omap2/prm44xx.c')
-rw-r--r-- | arch/arm/mach-omap2/prm44xx.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c index acb95936dfe7..47b657ceba8f 100644 --- a/arch/arm/mach-omap2/prm44xx.c +++ b/arch/arm/mach-omap2/prm44xx.c @@ -667,6 +667,54 @@ static int omap4_check_vcvp(void) return 0; } +/** + * omap4_pwrdm_save_context - Saves the powerdomain state + * @pwrdm: pointer to individual powerdomain + * + * The function saves the powerdomain state control information. + * This is needed in rtc+ddr modes where we lose powerdomain context. + */ +static void omap4_pwrdm_save_context(struct powerdomain *pwrdm) +{ + pwrdm->context = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, + pwrdm->prcm_offs, + pwrdm->pwrstctrl_offs); + + /* + * Do not save LOWPOWERSTATECHANGE, writing a 1 indicates a request, + * reading back a 1 indicates a request in progress. + */ + pwrdm->context &= ~OMAP4430_LOWPOWERSTATECHANGE_MASK; +} + +/** + * omap4_pwrdm_restore_context - Restores the powerdomain state + * @pwrdm: pointer to individual powerdomain + * + * The function restores the powerdomain state control information. + * This is needed in rtc+ddr modes where we lose powerdomain context. + */ +static void omap4_pwrdm_restore_context(struct powerdomain *pwrdm) +{ + int st, ctrl; + + st = omap4_prminst_read_inst_reg(pwrdm->prcm_partition, + pwrdm->prcm_offs, + pwrdm->pwrstctrl_offs); + + omap4_prminst_write_inst_reg(pwrdm->context, + pwrdm->prcm_partition, + pwrdm->prcm_offs, + pwrdm->pwrstctrl_offs); + + /* Make sure we only wait for a transition if there is one */ + st &= OMAP_POWERSTATEST_MASK; + ctrl = OMAP_POWERSTATEST_MASK & pwrdm->context; + + if (st != ctrl) + omap4_pwrdm_wait_transition(pwrdm); +} + struct pwrdm_ops omap4_pwrdm_operations = { .pwrdm_set_next_pwrst = omap4_pwrdm_set_next_pwrst, .pwrdm_read_next_pwrst = omap4_pwrdm_read_next_pwrst, @@ -685,6 +733,8 @@ struct pwrdm_ops omap4_pwrdm_operations = { .pwrdm_set_mem_retst = omap4_pwrdm_set_mem_retst, .pwrdm_wait_transition = omap4_pwrdm_wait_transition, .pwrdm_has_voltdm = omap4_check_vcvp, + .pwrdm_save_context = omap4_pwrdm_save_context, + .pwrdm_restore_context = omap4_pwrdm_restore_context, }; static int omap44xx_prm_late_init(void); |