diff options
Diffstat (limited to 'drivers/power/stmp37xx/ddi_bc_init.c')
| -rw-r--r-- | drivers/power/stmp37xx/ddi_bc_init.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/power/stmp37xx/ddi_bc_init.c b/drivers/power/stmp37xx/ddi_bc_init.c new file mode 100644 index 000000000000..246a35dcb3df --- /dev/null +++ b/drivers/power/stmp37xx/ddi_bc_init.c @@ -0,0 +1,188 @@ +/* + * Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include "ddi_bc_internal.h" + +//////////////////////////////////////////////////////////////////////////////// +//! \addtogroup ddi_bc +//! @{ +// +// Copyright (c) 2004-2005 SigmaTel, Inc. +// +//! \file ddi_bc_init.c +//! \brief Contains the Battery Charger initialization function. +//! \date 06/2005 +//! +//! This file contains Battery Charger initialization function. +//! +//////////////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////////////// +// Includes and external references +//////////////////////////////////////////////////////////////////////////////// +#include <mach/ddi_bc.h> +#include "ddi_bc_internal.h" + +//////////////////////////////////////////////////////////////////////////////// +// Code +//////////////////////////////////////////////////////////////////////////////// + +//////////////////////////////////////////////////////////////////////////////// +//! \brief Initialize the Battery Charger. +//! +//! \fntype Function +//! +//! This function initializes the Battery Charger. +//! +//! \param[in] pCfg A pointer to the new configuration. +//! +//! \retval DDI_BC_STATUS_SUCCESS +//! If the operation succeeded. +//! \retval DDI_BC_STATUS_ALREADY_INITIALIZED +//! If the Battery Charger is already initialized. +//! \retval DDI_BC_STATUS_HARDWARE_DISABLED +//! If the Battery Charger hardware is disabled by a laser fuse. +//! \retval DDI_BC_STATUS_BAD_BATTERY_MODE +//! If the power supply is set up for a non-rechargeable battery. +//! \retval DDI_BC_STATUS_CLOCK_GATE_CLOSED +//! If the clock gate for the power supply registers is closed. +//! \retval DDI_BC_STATUS_CFG_BAD_CHARGING_VOLTAGE +//! If the charging voltage is not either 4100 or 4200. +//! \retval DDI_BC_STATUS_CFG_BAD_BATTERY_TEMP_CHANNEL +//! If the LRADC channel number for monitoring battery temperature +//! is bad. +//! +//////////////////////////////////////////////////////////////////////////////// +ddi_bc_Status_t ddi_bc_Init(ddi_bc_Cfg_t * pCfg) +{ + + //-------------------------------------------------------------------------- + // We can only be initialized if we're in the Uninitialized state. + //-------------------------------------------------------------------------- + + if (g_ddi_bc_State != DDI_BC_STATE_UNINITIALIZED) { + return (DDI_BC_STATUS_ALREADY_INITIALIZED); + } + //-------------------------------------------------------------------------- + // Check if the battery charger hardware has been disabled by laser fuse. + //-------------------------------------------------------------------------- + + if (!ddi_power_GetBatteryChargerEnabled()) + return (DDI_BC_STATUS_HARDWARE_DISABLED); + + //-------------------------------------------------------------------------- + // Check if the power supply has been set up for a non-rechargeable battery. + //-------------------------------------------------------------------------- + + switch (ddi_power_GetBatteryMode()) { + + case DDI_POWER_BATT_MODE_LIION: + break; + + // TODO: we'll need to do NiMH also + default: + return (DDI_BC_STATUS_BAD_BATTERY_MODE); + //break; + + } + + //-------------------------------------------------------------------------- + // Make sure that the clock gate has been opened for the power supply + // registers. If not, then none of our writes to those registers will + // succeed, which will kind of slow us down... + //-------------------------------------------------------------------------- + + if (ddi_power_GetPowerClkGate()) { + return (DDI_BC_STATUS_CLOCK_GATE_CLOSED); + } + //-------------------------------------------------------------------------- + // Check the incoming configuration for nonsense. + //-------------------------------------------------------------------------- + + // + // Only permitted charging voltage: 4200mV. + // + + if (pCfg->u16ChargingVoltage != DDI_BC_LIION_CHARGING_VOLTAGE) { + return (DDI_BC_STATUS_CFG_BAD_CHARGING_VOLTAGE); + } + // + // There are 8 LRADC channels. + // + + if (pCfg->u8BatteryTempChannel > 7) { + return (DDI_BC_STATUS_CFG_BAD_BATTERY_TEMP_CHANNEL); + } + //-------------------------------------------------------------------------- + // Accept the configuration. + //-------------------------------------------------------------------------- + + //-------------------------------------------------------------------------- + // ddi_bc_Cfg_t.u16ChargingThresholdCurrent is destined for the + // register field HW_POWER_BATTCHRG.STOP_ILIMIT. This 4-bit field + // is unevenly quantized to provide a useful range of currents. A + // side effect of the quantization is that the field can only be + // set to certain unevenly-spaced values. + // + // Here, we use the two functions that manipulate the register field + // to adjust u16ChargingThresholdCurrent to match the quantized value. + //-------------------------------------------------------------------------- + pCfg->u16ChargingThresholdCurrent = + ddi_power_ExpressibleCurrent(pCfg->u16ChargingThresholdCurrent); + + //-------------------------------------------------------------------------- + // ...similar situation with ddi_bc_Cfg_t.u16BatteryTempSafeCurrent and + // u16DieTempSafeCurrent. + //-------------------------------------------------------------------------- + pCfg->u16BatteryTempSafeCurrent = + ddi_power_ExpressibleCurrent(pCfg->u16BatteryTempSafeCurrent); + pCfg->u16DieTempSafeCurrent = + ddi_power_ExpressibleCurrent(pCfg->u16DieTempSafeCurrent); + + g_ddi_bc_Configuration = *pCfg; + + //-------------------------------------------------------------------------- + // Turn the charger hardware off. This is a very important initial condition + // because we only flip the power switch on the hardware when we make + // transitions. Baseline, it needs to be off. + //-------------------------------------------------------------------------- + + ddi_power_SetChargerPowered(0); + + //-------------------------------------------------------------------------- + // Reset the current ramp. This will jam the current to zero and power off + // the charging hardware. + //-------------------------------------------------------------------------- + + ddi_bc_RampReset(); + + //-------------------------------------------------------------------------- + // Move to the Disabled state. + //-------------------------------------------------------------------------- + + g_ddi_bc_State = DDI_BC_STATE_DISABLED; + + //-------------------------------------------------------------------------- + // Return success. + //-------------------------------------------------------------------------- +#ifdef CONFIG_POWER_SUPPLY_DEBUG + printk("%s: success\n", __func__); +#endif + return (DDI_BC_STATUS_SUCCESS); + +} + +//////////////////////////////////////////////////////////////////////////////// +// End of file +//////////////////////////////////////////////////////////////////////////////// +//! @} |