From: Balaji T K balajitk@ti.com

Add battery charging support twl6030 driver. Add support for battery voltage and current measurements. Add command to get battery status and start/stop battery charging from USB.

Signed-off-by: Balaji T K balajitk@ti.com Tested-by: Steve Sakoman steve.sakoman@linaro.org --- board/ti/sdp4430/Makefile | 2 +- board/ti/sdp4430/cmd_bat.c | 58 ++++++++++++++++++ board/ti/sdp4430/sdp.c | 4 + drivers/power/twl6030.c | 124 ++++++++++++++++++++++++++++++++++++++- include/configs/omap4_sdp4430.h | 1 + include/twl6030.h | 45 +++++++++++++- 6 files changed, 229 insertions(+), 5 deletions(-) create mode 100644 board/ti/sdp4430/cmd_bat.c

diff --git a/board/ti/sdp4430/Makefile b/board/ti/sdp4430/Makefile index bce8534..f1ee544 100644 --- a/board/ti/sdp4430/Makefile +++ b/board/ti/sdp4430/Makefile @@ -25,7 +25,7 @@ include $(TOPDIR)/config.mk

LIB = $(obj)lib$(BOARD).o

-COBJS := sdp.o +COBJS := sdp.o cmd_bat.o

SRCS := $(COBJS:.o=.c) OBJS := $(addprefix $(obj),$(COBJS)) diff --git a/board/ti/sdp4430/cmd_bat.c b/board/ti/sdp4430/cmd_bat.c new file mode 100644 index 0000000..fe33538 --- /dev/null +++ b/board/ti/sdp4430/cmd_bat.c @@ -0,0 +1,58 @@ +/* + * Copyright (C) 2010 Texas Instruments + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <command.h> + +#ifdef CONFIG_CMD_BAT +#include <twl6030.h> + +int do_vbat(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + if (argc == 2) { + if (strncmp(argv[1], "startcharge", 12) == 0) + twl6030_start_usb_charging(); + else if (strncmp(argv[1], "stopcharge", 11) == 0) + twl6030_stop_usb_charging(); + else if (strncmp(argv[1], "status", 7) == 0) { + twl6030_get_battery_voltage(); + twl6030_get_battery_current(); + } else { + goto bat_cmd_usage; + } + } else { + goto bat_cmd_usage; + } + return 0; + +bat_cmd_usage: + return cmd_usage(cmdtp); +} + +U_BOOT_CMD( + bat, 2, 1, do_vbat, + "battery charging, voltage/current measurements", + "status - display battery voltage and current\n" + "bat startcharge - start charging via USB\n" + "bat stopcharge - stop charging\n" +); +#endif /* CONFIG_BAT_CMD */ diff --git a/board/ti/sdp4430/sdp.c b/board/ti/sdp4430/sdp.c index 01d5ce4..b13c4c5 100644 --- a/board/ti/sdp4430/sdp.c +++ b/board/ti/sdp4430/sdp.c @@ -23,6 +23,7 @@ * MA 02111-1307 USA */ #include <common.h> +#include <twl6030.h> #include <asm/arch/sys_proto.h> #include <asm/arch/mmc_host_def.h>

@@ -63,6 +64,9 @@ int board_eth_init(bd_t *bis) */ int misc_init_r(void) { +#ifdef CONFIG_TWL6030_POWER + twl6030_init_battery_charging(); +#endif return 0; }

diff --git a/drivers/power/twl6030.c b/drivers/power/twl6030.c index cf1da6b..fef57b4 100644 --- a/drivers/power/twl6030.c +++ b/drivers/power/twl6030.c @@ -36,6 +36,54 @@ static inline int twl6030_i2c_read_u8(u8 chip_no, u8 *val, u8 reg) return i2c_read(chip_no, reg, 1, val, 1); }

+static int twl6030_gpadc_read_channel(u8 channel_no) +{ + u8 lsb = 0; + u8 msb = 0; + int ret = 0; + + ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, &lsb, + GPCH0_LSB + channel_no * 2); + if (ret) + return ret; + + ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, &msb, + GPCH0_MSB + channel_no * 2); + if (ret) + return ret; + + return (msb << 8) | lsb; +} + +static int twl6030_gpadc_sw2_trigger(void) +{ + u8 val; + int ret = 0; + + ret = twl6030_i2c_write_u8(TWL6030_CHIP_ADC, CTRL_P2_SP2, CTRL_P2); + if (ret) + return ret; + + /* Waiting until the SW1 conversion ends*/ + val = CTRL_P2_BUSY; + + while (!((val & CTRL_P2_EOCP2) && (!(val & CTRL_P2_BUSY)))) { + ret = twl6030_i2c_read_u8(TWL6030_CHIP_ADC, &val, CTRL_P2); + if (ret) + return ret; + udelay(1000); + } + + return 0; +} + +void twl6030_stop_usb_charging(void) +{ + twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, 0, CONTROLLER_CTRL1); + + return; +} + void twl6030_start_usb_charging(void) { twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_VICHRG_1500, @@ -48,17 +96,89 @@ void twl6030_start_usb_charging(void) CHARGERUSB_INT_MASK); twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_VOREG_4P0, CHARGERUSB_VOREG); - twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_CTRL2_VITERM_100, + twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CHARGERUSB_CTRL2_VITERM_400, CHARGERUSB_CTRL2); + twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, TERM, CHARGERUSB_CTRL1); /* Enable USB charging */ twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, CONTROLLER_CTRL1_EN_CHARGER, CONTROLLER_CTRL1); return; }

+int twl6030_get_battery_current(void) +{ + int battery_current = 0; + u8 msb = 0; + u8 lsb = 0; + + twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, &msb, FG_REG_11); + twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, &lsb, FG_REG_10); + battery_current = ((msb << 8) | lsb); + + /* convert 10 bit signed number to 16 bit signed number */ + if (battery_current >= 0x2000) + battery_current = (battery_current - 0x4000); + + battery_current = battery_current * 3000 / 4096; + printf("Battery Current: %d mA\n", battery_current); + + return battery_current; +} + +int twl6030_get_battery_voltage(void) +{ + int battery_volt = 0; + int ret = 0; + + /* Start GPADC SW conversion */ + ret = twl6030_gpadc_sw2_trigger(); + if (ret) { + printf("Failed to convert battery voltage\n"); + return ret; + } + + /* measure Vbat voltage */ + battery_volt = twl6030_gpadc_read_channel(7); + if (battery_volt < 0) { + printf("Failed to read battery voltage\n"); + return ret; + } + battery_volt = (battery_volt * 25 * 1000) >> (10 + 2); + printf("Battery Voltage: %d mV\n", battery_volt); + + return battery_volt; +} + void twl6030_init_battery_charging(void) { - twl6030_start_usb_charging(); + u8 stat1 = 0; + int battery_volt = 0; + int ret = 0; + + /* Enable VBAT measurement */ + twl6030_i2c_write_u8(TWL6030_CHIP_PM, VBAT_MEAS, MISC1); + + /* Enable GPADC module */ + ret = twl6030_i2c_write_u8(TWL6030_CHIP_CHARGER, FGS | GPADCS, TOGGLE1); + if (ret) { + printf("Failed to enable GPADC\n"); + return; + } + + battery_volt = twl6030_get_battery_voltage(); + if (battery_volt < 0) + return; + + if (battery_volt < 3000) + printf("Main battery voltage too low!\n"); + + /* Check for the presence of USB charger */ + twl6030_i2c_read_u8(TWL6030_CHIP_CHARGER, &stat1, CONTROLLER_STAT1); + + /* check for battery presence indirectly via Fuel gauge */ + if ((stat1 & VBUS_DET) && (battery_volt < 3300)) + twl6030_start_usb_charging(); + return; }

diff --git a/include/configs/omap4_sdp4430.h b/include/configs/omap4_sdp4430.h index ed0bd41..bdd330a 100644 --- a/include/configs/omap4_sdp4430.h +++ b/include/configs/omap4_sdp4430.h @@ -102,6 +102,7 @@

/* TWL6030 */ #define CONFIG_TWL6030_POWER 1 +#define CONFIG_CMD_BAT 1

/* MMC */ #define CONFIG_GENERIC_MMC 1 diff --git a/include/twl6030.h b/include/twl6030.h index 54923ab..6ed68a0 100644 --- a/include/twl6030.h +++ b/include/twl6030.h @@ -32,6 +32,18 @@ #define TWL6030_CHIP_CHARGER 0x49 #define TWL6030_CHIP_PWM 0x49

+/* Slave Address 0x48 */ +#define VUSB_CFG_STATE 0xA2 + +#define MISC1 0xE4 +#define VAC_MEAS (1 << 2) +#define VBAT_MEAS (1 << 1) +#define BB_MEAS (1 << 0) + +#define MISC2 0xE5 + +/* Slave Address 0x49 */ + /* Battery CHARGER REGISTERS */ #define CONTROLLER_INT_MASK 0xE0 #define CONTROLLER_CTRL1 0xE1 @@ -76,16 +88,45 @@ #define CHARGERUSB_VOREG_4P0 0x19 #define CHARGERUSB_VOREG_4P2 0x23 #define CHARGERUSB_VOREG_4P76 0x3F +/* CHARGERUSB_CTRL1 */ +#define SUSPEND_BOOT (1 << 7) +#define OPA_MODE (1 << 6) +#define HZ_MODE (1 << 5) +#define TERM (1 << 4) /* CHARGERUSB_CTRL2 */ #define CHARGERUSB_CTRL2_VITERM_50 (0 << 5) #define CHARGERUSB_CTRL2_VITERM_100 (1 << 5) #define CHARGERUSB_CTRL2_VITERM_150 (2 << 5) +#define CHARGERUSB_CTRL2_VITERM_400 (7 << 5) /* CONTROLLER_CTRL1 */ #define CONTROLLER_CTRL1_EN_CHARGER (1 << 4) #define CONTROLLER_CTRL1_SEL_CHARGER (1 << 3) +/* CONTROLLER_STAT1 */ +#define CHRG_EXTCHRG_STATZ (1 << 7) +#define CHRG_DET_N (1 << 5) +#define VAC_DET (1 << 3) +#define VBUS_DET (1 << 2)

-#define VUSB_CFG_STATE 0xA2 -#define MISC2 0xE5 +#define FG_REG_10 0xCA +#define FG_REG_11 0xCB + +#define TOGGLE1 0x90 +#define FGS (1 << 5) +#define FGR (1 << 4) +#define GPADCS (1 << 1) +#define GPADCR (1 << 0) + +#define CTRL_P2 0x34 +#define CTRL_P2_SP2 (1 << 2) +#define CTRL_P2_EOCP2 (1 << 1) +#define CTRL_P2_BUSY (1 << 0) + +#define GPCH0_LSB 0x57 +#define GPCH0_MSB 0x58

void twl6030_init_battery_charging(void); void twl6030_usb_device_settings(void); +void twl6030_start_usb_charging(void); +void twl6030_stop_usb_charging(void); +int twl6030_get_battery_voltage(void); +int twl6030_get_battery_current(void);