i2c: Add TPS6586X driver
This power management chip supports battery charging and a large number of power supplies. This initial driver only provides the ability to adjust the two synchronous buck converters SM0 and SM1 in a stepwise manner. Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Simon Glass
Albert ARIBAUD
parent
a35925b8c1
commit
1aa7e23e2b
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@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk
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LIB := $(obj)libpower.o
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COBJS-$(CONFIG_FTPMU010_POWER) += ftpmu010.o
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COBJS-$(CONFIG_TPS6586X_POWER) += tps6586x.o
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COBJS-$(CONFIG_TWL4030_POWER) += twl4030.o
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COBJS-$(CONFIG_TWL6030_POWER) += twl6030.o
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COBJS-$(CONFIG_TWL6035_POWER) += twl6035.o
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@ -0,0 +1,280 @@
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/*
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* Copyright (c) 2011 The Chromium OS Authors.
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* (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <tps6586x.h>
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#include <asm/io.h>
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#include <i2c.h>
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static int bus_num; /* I2C bus we are on */
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#define I2C_ADDRESS 0x34 /* chip requires this address */
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static char inited; /* 1 if we have been inited */
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enum {
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/* Registers that we access */
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SUPPLY_CONTROL1 = 0x20,
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SUPPLY_CONTROL2,
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SM1_VOLTAGE_V1 = 0x23,
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SM1_VOLTAGE_V2,
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SM0_VOLTAGE_V1 = 0x26,
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SM0_VOLTAGE_V2,
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PFM_MODE = 0x47,
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/* Bits in the supply control registers */
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CTRL_SM1_RAMP = 0x01,
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CTRL_SM1_SUPPLY2 = 0x02,
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CTRL_SM0_RAMP = 0x04,
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CTRL_SM0_SUPPLY2 = 0x08,
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};
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#define MAX_I2C_RETRY 3
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int tps6586x_read(int reg)
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{
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int i;
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uchar data;
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int retval = -1;
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int old_bus_num;
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old_bus_num = i2c_get_bus_num();
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i2c_set_bus_num(bus_num);
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for (i = 0; i < MAX_I2C_RETRY; ++i) {
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if (!i2c_read(I2C_ADDRESS, reg, 1, &data, 1)) {
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retval = (int)data;
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goto exit;
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}
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/* i2c access failed, retry */
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udelay(100);
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}
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exit:
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i2c_set_bus_num(old_bus_num);
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debug("pmu_read %x=%x\n", reg, retval);
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if (retval < 0)
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debug("%s: failed to read register %#x: %d\n", __func__, reg,
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retval);
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return retval;
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}
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int tps6586x_write(int reg, uchar *data, uint len)
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{
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int i;
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int retval = -1;
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int old_bus_num;
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old_bus_num = i2c_get_bus_num();
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i2c_set_bus_num(bus_num);
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for (i = 0; i < MAX_I2C_RETRY; ++i) {
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if (!i2c_write(I2C_ADDRESS, reg, 1, data, len)) {
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retval = 0;
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goto exit;
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}
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/* i2c access failed, retry */
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udelay(100);
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}
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exit:
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i2c_set_bus_num(old_bus_num);
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debug("pmu_write %x=%x: ", reg, retval);
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for (i = 0; i < len; i++)
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debug("%x ", data[i]);
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if (retval)
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debug("%s: failed to write register %#x\n", __func__, reg);
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return retval;
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}
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/*
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* Get current voltage of SM0 and SM1
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*
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* @param sm0 Place to put SM0 voltage
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* @param sm1 Place to put SM1 voltage
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* @return 0 if ok, -1 on error
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*/
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static int read_voltages(int *sm0, int *sm1)
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{
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int ctrl1, ctrl2;
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int is_v2;
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/*
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* Each vdd has two supply sources, ie, v1 and v2.
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* The supply control reg1 and reg2 determine the current selection.
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*/
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ctrl1 = tps6586x_read(SUPPLY_CONTROL1);
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ctrl2 = tps6586x_read(SUPPLY_CONTROL2);
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if (ctrl1 == -1 || ctrl2 == -1)
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return -1;
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/* Figure out whether V1 or V2 is selected */
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is_v2 = (ctrl1 | ctrl2) & CTRL_SM0_SUPPLY2;
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*sm0 = tps6586x_read(is_v2 ? SM0_VOLTAGE_V2 : SM0_VOLTAGE_V1);
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*sm1 = tps6586x_read(is_v2 ? SM1_VOLTAGE_V2 : SM1_VOLTAGE_V1);
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if (*sm0 == -1 || *sm1 == -1)
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return -1;
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return 0;
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}
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static int set_voltage(int reg, int data, int rate)
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{
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uchar control_bit;
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uchar buff[3];
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control_bit = (reg == SM0_VOLTAGE_V1 ? CTRL_SM0_RAMP : CTRL_SM1_RAMP);
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/*
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* Only one supply is needed in u-boot. set both v1 and v2 to
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* same value.
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*
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* When both v1 and v2 are set to same value, we just need to set
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* control1 reg to trigger the supply selection.
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*/
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buff[0] = buff[1] = (uchar)data;
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buff[2] = rate;
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/* write v1, v2 and rate, then trigger */
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if (tps6586x_write(reg, buff, 3) ||
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tps6586x_write(SUPPLY_CONTROL1, &control_bit, 1))
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return -1;
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return 0;
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}
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static int calculate_next_voltage(int voltage, int target, int step)
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{
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int diff = voltage < target ? step : -step;
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if (abs(target - voltage) > step)
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voltage += diff;
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else
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voltage = target;
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return voltage;
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}
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int tps6586x_set_pwm_mode(int mask)
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{
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uchar val;
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int ret;
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assert(inited);
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ret = tps6586x_read(PFM_MODE);
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if (ret != -1) {
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val = (uchar)ret;
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val |= mask;
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ret = tps6586x_write(PFM_MODE, &val, 1);
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}
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if (ret == -1)
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debug("%s: Failed to read/write PWM mode reg\n", __func__);
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return ret;
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}
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int tps6586x_adjust_sm0_sm1(int sm0_target, int sm1_target, int step, int rate,
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int min_sm0_over_sm1)
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{
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int sm0, sm1;
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int bad;
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assert(inited);
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/* get current voltage settings */
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if (read_voltages(&sm0, &sm1)) {
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debug("%s: Cannot read voltage settings\n", __func__);
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return -1;
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}
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/*
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* if vdd_core < vdd_cpu + rel
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* skip
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*
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* This condition may happen when system reboots due to kernel crash.
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*/
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if (min_sm0_over_sm1 != -1 && sm0 < sm1 + min_sm0_over_sm1) {
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debug("%s: SM0 is %d, SM1 is %d, but min_sm0_over_sm1 is %d\n",
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__func__, sm0, sm1, min_sm0_over_sm1);
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return -1;
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}
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/*
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* Since vdd_core and vdd_cpu may both stand at either greater or less
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* than their nominal voltage, the adjustment may go either directions.
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*
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* Make sure vdd_core is always higher than vdd_cpu with certain margin.
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* So, find out which vdd to adjust first in each step.
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*
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* case 1: both sm0 and sm1 need to move up
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* adjust sm0 before sm1
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*
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* case 2: both sm0 and sm1 need to move down
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* adjust sm1 before sm0
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*
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* case 3: sm0 moves down and sm1 moves up
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* adjusting either one first is fine.
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*
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* Adjust vdd_core and vdd_cpu one step at a time until they reach
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* their nominal values.
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*/
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bad = 0;
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while (!bad && (sm0 != sm0_target || sm1 != sm1_target)) {
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int adjust_sm0_late = 0; /* flag to adjust vdd_core later */
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debug("%d-%d %d-%d ", sm0, sm0_target, sm1, sm1_target);
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if (sm0 != sm0_target) {
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/*
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* if case 1 and case 3, set new sm0 first.
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* otherwise, hold down until new sm1 is set.
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*/
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sm0 = calculate_next_voltage(sm0, sm0_target, step);
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if (sm1 < sm1_target)
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bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate);
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else
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adjust_sm0_late = 1;
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}
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if (sm1 != sm1_target) {
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sm1 = calculate_next_voltage(sm1, sm1_target, step);
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bad |= set_voltage(SM1_VOLTAGE_V1, sm1, rate);
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}
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if (adjust_sm0_late)
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bad |= set_voltage(SM0_VOLTAGE_V1, sm0, rate);
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debug("%d\n", adjust_sm0_late);
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}
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debug("%d-%d %d-%d done\n", sm0, sm0_target, sm1, sm1_target);
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return bad ? -1 : 0;
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}
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int tps6586x_init(int bus)
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{
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bus_num = bus;
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inited = 1;
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return 0;
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}
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@ -0,0 +1,68 @@
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/*
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* (C) Copyright 2010,2011
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* NVIDIA Corporation <www.nvidia.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __H_
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#define _TPS6586X_H_
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enum {
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/* SM0-2 PWM/PFM Mode Selection */
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TPS6586X_PWM_SM0 = 1 << 0,
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TPS6586X_PWM_SM1 = 1 << 1,
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TPS6586X_PWM_SM2 = 1 << 2,
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};
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/**
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* Enable PWM mode for selected SM0-2
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*
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* @param mask Mask of synchronous converter to enable (TPS6586X_PWM_...)
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* @return 0 if ok, -1 on error
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*/
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int tps6586x_set_pwm_mode(int mask);
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/**
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* Adjust SM0 and SM1 voltages to the given targets in incremental steps.
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*
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* @param sm0_target Target voltage for SM0 in 25mW units, 0=725mV, 31=1.5V
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* @param sm1_target Target voltage for SM1 in 25mW units, 0=725mV, 31=1.5V
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* @param step Amount to change voltage in each step, in 25mW units
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* @param rate Slew ratein mV/us: 0=instantly, 1=0.11, 2=0.22,
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* 3=0.44, 4=0.88, 5=1.76, 6=3.52, 7=7.04
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* @param min_sm0_over_sm1 Minimum amount by which sm0 must exceed sm1.
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* If this condition is not met, no adjustment will be
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* done and an error will be reported. Use -1 to skip
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* this check.
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* @return 0 if ok, -1 on error
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*/
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int tps6586x_adjust_sm0_sm1(int sm0_target, int sm1_target, int step, int rate,
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int min_sm0_over_sm1);
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/**
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* Set up the TPS6586X I2C bus number. This will be used for all operations
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* on the device. This function must be called before using other functions.
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*
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* @param bus I2C bus number containing the TPS6586X chip
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* @return 0 (always succeeds)
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*/
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int tps6586x_init(int bus);
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#endif /* _TPS6586X_H_ */
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