diff options
Diffstat (limited to 'drivers/power/mxs/ddi_bc_init.c')
| -rw-r--r-- | drivers/power/mxs/ddi_bc_init.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/power/mxs/ddi_bc_init.c b/drivers/power/mxs/ddi_bc_init.c new file mode 100644 index 000000000000..c93f8969f92c --- /dev/null +++ b/drivers/power/mxs/ddi_bc_init.c @@ -0,0 +1,188 @@ +/* + * Copyright (C) 2010 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 */ + +/* @} */ |