LXR uboot/drivers/power/pmic/pmic

   1/*
   2 * (C) Copyright 2011-2013
   3 * Texas Instruments, <www.ti.com>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <i2c.h>
  10#include <power/tps65217.h>
  11
  12/**
  13 * tps65217_reg_read() - Generic function that can read a TPS65217 register
  14 * @src_reg:             Source register address
  15 * @src_val:             Address of destination variable
  16 * @return:              0 for success, not 0 on failure.
  17 */
  18int tps65217_reg_read(uchar src_reg, uchar *src_val)
  19{
  20        return i2c_read(TPS65217_CHIP_PM, src_reg, 1, src_val, 1);
  21}
  22
  23/**
  24 *  tps65217_reg_write() - Generic function that can write a TPS65217 PMIC
  25 *                         register or bit field regardless of protection
  26 *                         level.
  27 *
  28 *  @prot_level:           Register password protection.  Use
  29 *                         TPS65217_PROT_LEVEL_NONE,
  30 *                         TPS65217_PROT_LEVEL_1 or TPS65217_PROT_LEVEL_2
  31 *  @dest_reg:             Register address to write.
  32 *  @dest_val:             Value to write.
  33 *  @mask:                 Bit mask (8 bits) to be applied.  Function will only
  34 *                         change bits that are set in the bit mask.
  35 *
  36 *  @return:               0 for success, not 0 on failure, as per the i2c API
  37 */
  38int tps65217_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
  39                       uchar mask)
  40{
  41        uchar read_val;
  42        uchar xor_reg;
  43        int ret;
  44
  45        /*
  46         * If we are affecting only a bit field, read dest_reg and apply the
  47         * mask
  48         */
  49        if (mask != TPS65217_MASK_ALL_BITS) {
  50                ret = i2c_read(TPS65217_CHIP_PM, dest_reg, 1, &read_val, 1);
  51                if (ret)
  52                        return ret;
  53                read_val &= (~mask);
  54                read_val |= (dest_val & mask);
  55                dest_val = read_val;
  56        }
  57
  58        if (prot_level > 0) {
  59                xor_reg = dest_reg ^ TPS65217_PASSWORD_UNLOCK;
  60                ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
  61                                &xor_reg, 1);
  62                if (ret)
  63                        return ret;
  64        }
  65
  66        ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
  67        if (ret)
  68                return ret;
  69
  70        if (prot_level == TPS65217_PROT_LEVEL_2) {
  71                ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
  72                                &xor_reg, 1);
  73                if (ret)
  74                        return ret;
  75
  76                ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
  77                if (ret)
  78                        return ret;
  79        }
  80
  81        return 0;
  82}
  83
  84/**
  85 * tps65217_voltage_update() - Function to change a voltage level, as this
  86 *                             is a multi-step process.
  87 * @dc_cntrl_reg:              DC voltage control register to change.
  88 * @volt_sel:                  New value for the voltage register
  89 * @return:                    0 for success, not 0 on failure.
  90 */
  91int tps65217_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
  92{
  93        if ((dc_cntrl_reg != TPS65217_DEFDCDC1) &&
  94            (dc_cntrl_reg != TPS65217_DEFDCDC2) &&
  95            (dc_cntrl_reg != TPS65217_DEFDCDC3))
  96                return 1;
  97
  98        /* set voltage level */
  99        if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
 100                               TPS65217_MASK_ALL_BITS))
 101                return 1;
 102
 103        /* set GO bit to initiate voltage transition */
 104        if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, TPS65217_DEFSLEW,
 105                               TPS65217_DCDC_GO, TPS65217_DCDC_GO))
 106                return 1;
 107
 108        return 0;
 109}
 110