diff options
Diffstat (limited to 'arch/arm/mach-omap2/vc.c')
| -rw-r--r-- | arch/arm/mach-omap2/vc.c | 70 |
1 files changed, 58 insertions, 12 deletions
diff --git a/arch/arm/mach-omap2/vc.c b/arch/arm/mach-omap2/vc.c index 72c9cb64a42..1791f79112b 100644 --- a/arch/arm/mach-omap2/vc.c +++ b/arch/arm/mach-omap2/vc.c @@ -19,6 +19,52 @@ #include "prm-regbits-44xx.h" #include "prm44xx.h" +/* + * Channel configuration bits, common for OMAP3 & 4 + * OMAP3 register: PRM_VC_CH_CONF + * OMAP4 register: PRM_VC_CFG_CHANNEL + */ +#define CFG_CHANNEL_SA BIT(0) +#define CFG_CHANNEL_RAV BIT(1) +#define CFG_CHANNEL_RAC BIT(2) +#define CFG_CHANNEL_RACEN BIT(3) +#define CFG_CHANNEL_CMD BIT(4) +#define CFG_CHANNEL_MASK 0x3f + +/** + * omap_vc_config_channel - configure VC channel to PMIC mappings + * @voltdm: pointer to voltagdomain defining the desired VC channel + * + * Configures the VC channel to PMIC mappings for the following + * PMIC settings + * - i2c slave address (SA) + * - voltage configuration address (RAV) + * - command configuration address (RAC) and enable bit (RACEN) + * - command values for ON, ONLP, RET and OFF (CMD) + * + * This function currently only allows flexible configuration of the + * non-default channel. Starting with OMAP4, there are more than 2 + * channels, with one defined as the default (on OMAP4, it's MPU.) + * Only the non-default channel can be configured. + */ +static int omap_vc_config_channel(struct voltagedomain *voltdm) +{ + struct omap_vc_channel *vc = voltdm->vc; + + /* + * For default channel, the only configurable bit is RACEN. + * All others must stay at zero (see function comment above.) + */ + if (vc->flags & OMAP_VC_CHANNEL_DEFAULT) + vc->cfg_channel &= CFG_CHANNEL_RACEN; + + voltdm->rmw(CFG_CHANNEL_MASK << vc->cfg_channel_sa_shift, + vc->cfg_channel << vc->cfg_channel_sa_shift, + vc->common->cfg_channel_reg); + + return 0; +} + /* Voltage scale and accessory APIs */ int omap_vc_pre_scale(struct voltagedomain *voltdm, unsigned long target_volt, @@ -166,8 +212,6 @@ static void __init omap3_vc_init_channel(struct voltagedomain *voltdm) * Generic VC parameters init * XXX This data should be abstracted out */ - voltdm->write(OMAP3430_CMD1_MASK | OMAP3430_RAV1_MASK, - OMAP3_PRM_VC_CH_CONF_OFFSET); voltdm->write(OMAP3430_MCODE_SHIFT | OMAP3430_HSEN_MASK, OMAP3_PRM_VC_I2C_CFG_OFFSET); @@ -186,15 +230,6 @@ static void __init omap4_vc_init_channel(struct voltagedomain *voltdm) if (is_initialized) return; - /* - * Generic VC parameters init - * XXX This data should be abstracted out - */ - vc_val = (OMAP4430_RAV_VDD_MPU_L_MASK | OMAP4430_CMD_VDD_MPU_L_MASK | - OMAP4430_RAV_VDD_IVA_L_MASK | OMAP4430_CMD_VDD_IVA_L_MASK | - OMAP4430_RAV_VDD_CORE_L_MASK | OMAP4430_CMD_VDD_CORE_L_MASK); - voltdm->write(vc_val, OMAP4_PRM_VC_CFG_CHANNEL_OFFSET); - /* XXX These are magic numbers and do not belong! */ vc_val = (0x60 << OMAP4430_SCLL_SHIFT | 0x26 << OMAP4430_SCLH_SHIFT); voltdm->write(vc_val, OMAP4_PRM_VC_CFG_I2C_CLK_OFFSET); @@ -222,6 +257,8 @@ void __init omap_vc_init_channel(struct voltagedomain *voltdm) return; } + vc->cfg_channel = 0; + /* get PMIC/board specific settings */ vc->i2c_slave_addr = vdd->pmic_info->i2c_slave_addr; vc->volt_reg_addr = vdd->pmic_info->volt_reg_addr; @@ -232,6 +269,7 @@ void __init omap_vc_init_channel(struct voltagedomain *voltdm) voltdm->rmw(vc->smps_sa_mask, vc->i2c_slave_addr << __ffs(vc->smps_sa_mask), vc->common->smps_sa_reg); + vc->cfg_channel |= CFG_CHANNEL_SA; /* * Configure the PMIC register addresses. @@ -239,10 +277,14 @@ void __init omap_vc_init_channel(struct voltagedomain *voltdm) voltdm->rmw(vc->smps_volra_mask, vc->volt_reg_addr << __ffs(vc->smps_volra_mask), vc->common->smps_volra_reg); - if (vc->cmd_reg_addr) + vc->cfg_channel |= CFG_CHANNEL_RAV; + + if (vc->cmd_reg_addr) { voltdm->rmw(vc->smps_cmdra_mask, vc->cmd_reg_addr << __ffs(vc->smps_cmdra_mask), vc->common->smps_cmdra_reg); + vc->cfg_channel |= CFG_CHANNEL_RAC | CFG_CHANNEL_RACEN; + } /* Set up the on, inactive, retention and off voltage */ on_vsel = vdd->pmic_info->uv_to_vsel(vdd->pmic_info->on_volt); @@ -254,6 +296,10 @@ void __init omap_vc_init_channel(struct voltagedomain *voltdm) (ret_vsel << vc->common->cmd_ret_shift) | (off_vsel << vc->common->cmd_off_shift)); voltdm->write(val, vc->cmdval_reg); + vc->cfg_channel |= CFG_CHANNEL_CMD; + + /* Channel configuration */ + omap_vc_config_channel(voltdm); /* Configure the setup times */ voltdm->rmw(voltdm->vfsm->voltsetup_mask, |