| /* |
| * Copyright 2012, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| */ |
| |
| #include <delay.h> |
| #include <types.h> |
| #include <console/console.h> |
| #include <device/i2c.h> |
| #include "tps65090.h" |
| |
| /* TPS65090 register addresses */ |
| enum { |
| REG_CG_CTRL0 = 4, |
| REG_CG_STATUS1 = 0xa, |
| }; |
| |
| enum { |
| CG_CTRL0_ENC_MASK = 0x01, |
| |
| MAX_FET_NUM = 7, |
| MAX_CTRL_READ_TRIES = 5, |
| |
| /* TPS65090 FET_CTRL register values */ |
| FET_CTRL_TOFET = 1 << 7, /* Timeout, startup, overload */ |
| FET_CTRL_PGFET = 1 << 4, /* Power good for FET status */ |
| FET_CTRL_WAIT = 3 << 2, /* Overcurrent timeout max */ |
| FET_CTRL_ADENFET = 1 << 1, /* Enable output auto discharge */ |
| FET_CTRL_ENFET = 1 << 0, /* Enable FET */ |
| }; |
| |
| static int tps65090_i2c_write(unsigned int bus, |
| unsigned int reg_addr, unsigned char value) |
| { |
| int ret; |
| |
| ret = i2c_write(bus, TPS65090_I2C_ADDR, reg_addr, 1, &value, 1); |
| printk(BIOS_DEBUG, "%s: reg=%#x, value=%#x, ret=%d\n", |
| __func__, reg_addr, value, ret); |
| return ret; |
| } |
| |
| static int tps65090_i2c_read(unsigned int bus, |
| unsigned int reg_addr, unsigned char *value) |
| { |
| int ret; |
| |
| printk(BIOS_DEBUG, "%s: reg=%#x, ", __func__, reg_addr); |
| ret = i2c_read(bus, TPS65090_I2C_ADDR, reg_addr, 1, value, 1); |
| if (ret) |
| printk(BIOS_DEBUG, "fail, ret=%d\n", ret); |
| else |
| printk(BIOS_DEBUG, "value=%#x, ret=%d\n", *value, ret); |
| return ret; |
| } |
| |
| /** |
| * Set the power state for a FET |
| * |
| * @fet_id Fet number to set (1..MAX_FET_NUM) |
| * @set 1 to power on FET, 0 to power off |
| * @return FET_ERR_COMMS if we got a comms error, FET_ERR_NOT_READY if the |
| * FET failed to change state. If all is ok, returns 0. |
| */ |
| static int tps65090_fet_set(unsigned int bus, enum fet_id fet_id, int set) |
| { |
| int retry, value; |
| uint8_t reg; |
| |
| value = FET_CTRL_ADENFET | FET_CTRL_WAIT; |
| if (set) |
| value |= FET_CTRL_ENFET; |
| |
| if (tps65090_i2c_write(bus, fet_id, value)) |
| return FET_ERR_COMMS; |
| /* Try reading until we get a result */ |
| for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) { |
| if (tps65090_i2c_read(bus, fet_id, ®)) |
| return FET_ERR_COMMS; |
| |
| /* Check that the fet went into the expected state */ |
| if (!!(reg & FET_CTRL_PGFET) == set) |
| return 0; |
| |
| /* If we got a timeout, there is no point in waiting longer */ |
| if (reg & FET_CTRL_TOFET) |
| break; |
| |
| udelay(1000); |
| } |
| |
| printk(BIOS_DEBUG, "FET %d: Power good should have set to %d but " |
| "reg=%#02x\n", fet_id, set, reg); |
| return FET_ERR_NOT_READY; |
| } |
| |
| /* FIXME(dhendrix): add timer API */ |
| #if 0 |
| int tps65090_fet_enable(unsigned int bus, enum fet_id fet_id) |
| { |
| int loops; |
| unsigned long start; |
| int ret = 0; |
| |
| start = get_timer(0); |
| for (loops = 0; ; loops++) { |
| ret = tps65090_fet_set(bus, fet_id, 1); |
| if (!ret) |
| break; |
| |
| if (get_timer(start) > 100) |
| break; |
| |
| /* Turn it off and try again until we time out */ |
| tps65090_fet_set(bus, fet_id, 0); |
| } |
| |
| if (ret) { |
| printk(BIOS_DEBUG, "%s: FET%d failed to power on: time=%lums, " |
| "loops=%d\n", __func__, fet_id, |
| get_timer(start), loops); |
| } else if (loops) { |
| printk(BIOS_DEBUG, "%s: FET%d powered on after %lums, " |
| "loops=%d\n", __func__, fet_id, |
| get_timer(start), loops); |
| } |
| /* |
| * Unfortunately, there are some conditions where the power |
| * good bit will be 0, but the fet still comes up. One such |
| * case occurs with the lcd backlight. We'll just return 0 here |
| * and assume that the fet will eventually come up. |
| */ |
| if (ret == FET_ERR_NOT_READY) |
| ret = 0; |
| |
| return ret; |
| } |
| #endif |
| int tps65090_fet_enable(unsigned int bus, enum fet_id fet_id) |
| { |
| int loops; |
| int ret = 0; |
| |
| for (loops = 0; loops < 100; loops++) { |
| ret = tps65090_fet_set(bus, fet_id, 1); |
| if (!ret) |
| break; |
| |
| /* Turn it off and try again until we time out */ |
| tps65090_fet_set(bus, fet_id, 0); |
| udelay(1000); |
| } |
| |
| if (ret) { |
| printk(BIOS_DEBUG, "%s: FET%d failed to power on\n", |
| __func__, fet_id); |
| } else if (loops) { |
| printk(BIOS_DEBUG, "%s: FET%d powered on\n", |
| __func__, fet_id); |
| } |
| /* |
| * Unfortunately, there are some conditions where the power |
| * good bit will be 0, but the fet still comes up. One such |
| * case occurs with the lcd backlight. We'll just return 0 here |
| * and assume that the fet will eventually come up. |
| */ |
| if (ret == FET_ERR_NOT_READY) |
| ret = 0; |
| |
| return ret; |
| } |
| |
| int tps65090_fet_disable(unsigned int bus, enum fet_id fet_id) |
| { |
| return tps65090_fet_set(bus, fet_id, 0); |
| } |
| |
| int tps65090_fet_is_enabled(unsigned int bus, enum fet_id fet_id) |
| { |
| unsigned char reg; |
| int ret; |
| |
| ret = tps65090_i2c_read(bus, fet_id, ®); |
| if (ret) { |
| printk(BIOS_DEBUG, "fail to read FET%u_CTRL", fet_id); |
| return -2; |
| } |
| |
| return reg & FET_CTRL_ENFET; |
| } |
| |
| int tps65090_is_charging(unsigned int bus) |
| { |
| unsigned char val; |
| int ret; |
| |
| ret = tps65090_i2c_read(bus, REG_CG_CTRL0, &val); |
| if (ret) |
| return ret; |
| return val & CG_CTRL0_ENC_MASK ? 1 : 0; |
| } |
| |
| int tps65090_set_charge_enable(unsigned int bus, int enable) |
| { |
| unsigned char val; |
| int ret; |
| |
| ret = tps65090_i2c_read(bus, REG_CG_CTRL0, &val); |
| if (!ret) { |
| if (enable) |
| val |= CG_CTRL0_ENC_MASK; |
| else |
| val &= ~CG_CTRL0_ENC_MASK; |
| ret = tps65090_i2c_write(bus, REG_CG_CTRL0, val); |
| } |
| if (ret) { |
| printk(BIOS_DEBUG, "%s: Failed to enable\n", __func__); |
| return ret; |
| } |
| return 0; |
| } |
| |
| int tps65090_get_status(unsigned int bus) |
| { |
| unsigned char val; |
| int ret; |
| |
| ret = tps65090_i2c_read(bus, REG_CG_STATUS1, &val); |
| if (ret) |
| return ret; |
| return val; |
| } |