diff options
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-omap2/vc.c | 108 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/vc.h | 1 |
2 files changed, 91 insertions, 18 deletions
diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c index 4c3c41f..73b4bcd 100644 --- a/arch/arm/mach-omap2/vc.c +++ b/arch/arm/mach-omap2/vc.c @@ -204,29 +204,109 @@ int omap_vc_bypass_scale(struct voltagedomain *voltdm, return 0; } -static void __init omap3_vfsm_init(struct voltagedomain *voltdm) +/** + * omap3_set_i2c_timings - sets i2c sleep timings for a channel + * @voltdm: channel to configure + * @off_mode: select whether retention or off mode values used + * + * Calculates and sets up voltage controller to use I2C based + * voltage scaling for sleep modes. This can be used for either off mode + * or retention. Off mode has additionally an option to use sys_off_mode + * pad, which uses a global signal to program the whole power IC to + * off-mode. + */ +static void omap3_set_i2c_timings(struct voltagedomain *voltdm, bool off_mode) { + unsigned long voltsetup1; + u32 tgt_volt; + + if (off_mode) + tgt_volt = voltdm->vc_param->off; + else + tgt_volt = voltdm->vc_param->ret; + + voltsetup1 = (voltdm->vc_param->on - tgt_volt) / + voltdm->pmic->slew_rate; + + voltsetup1 = voltsetup1 * voltdm->sys_clk.rate / 8 / 1000000 + 1; + + voltdm->rmw(voltdm->vfsm->voltsetup_mask, + voltsetup1 << __ffs(voltdm->vfsm->voltsetup_mask), + voltdm->vfsm->voltsetup_reg); + /* - * Voltage Manager FSM parameters init - * XXX This data should be passed in from the board file + * pmic is not controlling the voltage scaling during retention, + * thus set voltsetup2 to 0 */ - voltdm->write(OMAP3_CLKSETUP, OMAP3_PRM_CLKSETUP_OFFSET); - voltdm->write(OMAP3_VOLTOFFSET, OMAP3_PRM_VOLTOFFSET_OFFSET); - voltdm->write(OMAP3_VOLTSETUP2, OMAP3_PRM_VOLTSETUP2_OFFSET); + voltdm->write(0, OMAP3_PRM_VOLTSETUP2_OFFSET); } -static void __init omap3_vc_init_channel(struct voltagedomain *voltdm) +/** + * omap3_set_off_timings - sets off-mode timings for a channel + * @voltdm: channel to configure + * + * Calculates and sets up off-mode timings for a channel. Off-mode + * can use either I2C based voltage scaling, or alternatively + * sys_off_mode pad can be used to send a global command to power IC. + * This function first checks which mode is being used, and calls + * omap3_set_i2c_timings() if the system is using I2C control mode. + * sys_off_mode has the additional benefit that voltages can be + * scaled to zero volt level with TWL4030 / TWL5030, I2C can only + * scale to 600mV. + */ +static void omap3_set_off_timings(struct voltagedomain *voltdm) { - static bool is_initialized; + unsigned long clksetup; + unsigned long voltsetup2; + unsigned long voltsetup2_old; + u32 val; - if (is_initialized) + /* check if sys_off_mode is used to control off-mode voltages */ + val = voltdm->read(OMAP3_PRM_VOLTCTRL_OFFSET); + if (!(val & OMAP3430_SEL_OFF_MASK)) { + /* No, omap is controlling them over I2C */ + omap3_set_i2c_timings(voltdm, true); return; + } - omap3_vfsm_init(voltdm); + clksetup = voltdm->read(OMAP3_PRM_CLKSETUP_OFFSET); - is_initialized = true; + /* voltsetup 2 in us */ + voltsetup2 = voltdm->vc_param->on / voltdm->pmic->slew_rate; + + /* convert to 32k clk cycles */ + voltsetup2 = DIV_ROUND_UP(voltsetup2 * 32768, 1000000); + + voltsetup2_old = voltdm->read(OMAP3_PRM_VOLTSETUP2_OFFSET); + + /* + * Update voltsetup2 if higher than current value (needed because + * we have multiple channels with different ramp times), also + * update voltoffset always to value recommended by TRM + */ + if (voltsetup2 > voltsetup2_old) { + voltdm->write(voltsetup2, OMAP3_PRM_VOLTSETUP2_OFFSET); + voltdm->write(clksetup - voltsetup2, + OMAP3_PRM_VOLTOFFSET_OFFSET); + } else + voltdm->write(clksetup - voltsetup2_old, + OMAP3_PRM_VOLTOFFSET_OFFSET); + + /* + * omap is not controlling voltage scaling during off-mode, + * thus set voltsetup1 to 0 + */ + voltdm->rmw(voltdm->vfsm->voltsetup_mask, 0, + voltdm->vfsm->voltsetup_reg); + + /* voltoffset must be clksetup minus voltsetup2 according to TRM */ + voltdm->write(clksetup - voltsetup2, OMAP3_PRM_VOLTOFFSET_OFFSET); } +static void __init omap3_vc_init_channel(struct voltagedomain *voltdm) +{ + omap3_set_off_timings(voltdm); +} /* OMAP4 specific voltage init functions */ static void __init omap4_vc_init_channel(struct voltagedomain *voltdm) @@ -337,7 +417,6 @@ void __init omap_vc_init_channel(struct voltagedomain *voltdm) vc->i2c_slave_addr = voltdm->pmic->i2c_slave_addr; vc->volt_reg_addr = voltdm->pmic->volt_reg_addr; vc->cmd_reg_addr = voltdm->pmic->cmd_reg_addr; - vc->setup_time = voltdm->pmic->volt_setup_time; /* Configure the i2c slave address for this VC */ voltdm->rmw(vc->smps_sa_mask, @@ -376,11 +455,6 @@ void __init omap_vc_init_channel(struct voltagedomain *voltdm) /* Channel configuration */ omap_vc_config_channel(voltdm); - /* Configure the setup times */ - voltdm->rmw(voltdm->vfsm->voltsetup_mask, - vc->setup_time << __ffs(voltdm->vfsm->voltsetup_mask), - voltdm->vfsm->voltsetup_reg); - omap_vc_i2c_init(voltdm); if (cpu_is_omap34xx()) diff --git a/arch/arm/mach-omap2/vc.h b/arch/arm/mach-omap2/vc.h index 7618b69..91c8d75 100644 --- a/arch/arm/mach-omap2/vc.h +++ b/arch/arm/mach-omap2/vc.h @@ -86,7 +86,6 @@ struct omap_vc_channel { u16 i2c_slave_addr; u16 volt_reg_addr; u16 cmd_reg_addr; - u16 setup_time; u8 cfg_channel; bool i2c_high_speed; |