LXR uboot/drivers/power/pmic/pmic

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2011-2013
   4 * Texas Instruments, <www.ti.com>
   5 */
   6
   7#include <common.h>
   8#include <i2c.h>
   9#include <power/tps65217.h>
  10
  11struct udevice *tps65217_dev __section(".data") = NULL;
  12
  13/**
  14 * tps65217_reg_read() - Generic function that can read a TPS65217 register
  15 * @src_reg:             Source register address
  16 * @src_val:             Address of destination variable
  17 * @return:              0 for success, not 0 on failure.
  18 */
  19int tps65217_reg_read(uchar src_reg, uchar *src_val)
  20{
  21#if !CONFIG_IS_ENABLED(DM_I2C)
  22        return i2c_read(TPS65217_CHIP_PM, src_reg, 1, src_val, 1);
  23#else
  24        return dm_i2c_read(tps65217_dev, src_reg,  src_val, 1);
  25#endif
  26}
  27
  28/**
  29 *  tps65217_reg_write() - Generic function that can write a TPS65217 PMIC
  30 *                         register or bit field regardless of protection
  31 *                         level.
  32 *
  33 *  @prot_level:           Register password protection.  Use
  34 *                         TPS65217_PROT_LEVEL_NONE,
  35 *                         TPS65217_PROT_LEVEL_1 or TPS65217_PROT_LEVEL_2
  36 *  @dest_reg:             Register address to write.
  37 *  @dest_val:             Value to write.
  38 *  @mask:                 Bit mask (8 bits) to be applied.  Function will only
  39 *                         change bits that are set in the bit mask.
  40 *
  41 *  @return:               0 for success, not 0 on failure, as per the i2c API
  42 */
  43int tps65217_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
  44                       uchar mask)
  45{
  46        uchar read_val;
  47        uchar xor_reg;
  48        int ret;
  49
  50        /*
  51         * If we are affecting only a bit field, read dest_reg and apply the
  52         * mask
  53         */
  54        if (mask != TPS65217_MASK_ALL_BITS) {
  55#if !CONFIG_IS_ENABLED(DM_I2C)
  56                ret = i2c_read(TPS65217_CHIP_PM, dest_reg, 1, &read_val, 1);
  57#else
  58                ret = dm_i2c_read(tps65217_dev, dest_reg, &read_val, 1);
  59#endif
  60                if (ret)
  61                        return ret;
  62
  63                read_val &= (~mask);
  64                read_val |= (dest_val & mask);
  65                dest_val = read_val;
  66        }
  67
  68        if (prot_level > 0) {
  69                xor_reg = dest_reg ^ TPS65217_PASSWORD_UNLOCK;
  70#if !CONFIG_IS_ENABLED(DM_I2C)
  71                ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
  72                                &xor_reg, 1);
  73#else
  74                ret = dm_i2c_write(tps65217_dev, TPS65217_PASSWORD,
  75                                   &xor_reg, 1);
  76#endif
  77                if (ret)
  78                        return ret;
  79        }
  80#if !CONFIG_IS_ENABLED(DM_I2C)
  81        ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
  82#else
  83        ret = dm_i2c_write(tps65217_dev, dest_reg, &dest_val, 1);
  84#endif
  85        if (ret)
  86                return ret;
  87
  88        if (prot_level == TPS65217_PROT_LEVEL_2) {
  89#if !CONFIG_IS_ENABLED(DM_I2C)
  90                ret = i2c_write(TPS65217_CHIP_PM, TPS65217_PASSWORD, 1,
  91                                &xor_reg, 1);
  92#else
  93                ret = dm_i2c_write(tps65217_dev, TPS65217_PASSWORD,
  94                                   &xor_reg, 1);
  95#endif
  96                if (ret)
  97                        return ret;
  98
  99#if !CONFIG_IS_ENABLED(DM_I2C)
 100                ret = i2c_write(TPS65217_CHIP_PM, dest_reg, 1, &dest_val, 1);
 101#else
 102                ret = dm_i2c_write(tps65217_dev, dest_reg, &dest_val, 1);
 103#endif
 104                if (ret)
 105                        return ret;
 106        }
 107
 108        return 0;
 109}
 110
 111/**
 112 * tps65217_voltage_update() - Function to change a voltage level, as this
 113 *                             is a multi-step process.
 114 * @dc_cntrl_reg:              DC voltage control register to change.
 115 * @volt_sel:                  New value for the voltage register
 116 * @return:                    0 for success, not 0 on failure.
 117 */
 118int tps65217_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
 119{
 120        if ((dc_cntrl_reg != TPS65217_DEFDCDC1) &&
 121            (dc_cntrl_reg != TPS65217_DEFDCDC2) &&
 122            (dc_cntrl_reg != TPS65217_DEFDCDC3))
 123                return 1;
 124
 125        /* set voltage level */
 126        if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
 127                               TPS65217_MASK_ALL_BITS))
 128                return 1;
 129
 130        /* set GO bit to initiate voltage transition */
 131        if (tps65217_reg_write(TPS65217_PROT_LEVEL_2, TPS65217_DEFSLEW,
 132                               TPS65217_DCDC_GO, TPS65217_DCDC_GO))
 133                return 1;
 134
 135        return 0;
 136}
 137
 138int power_tps65217_init(unsigned char bus)
 139{
 140#if CONFIG_IS_ENABLED(DM_I2C)
 141        struct udevice *dev = NULL;
 142        int rc;
 143
 144        rc = i2c_get_chip_for_busnum(bus, TPS65217_CHIP_PM, 1, &dev);
 145        if (rc)
 146                return rc;
 147        tps65217_dev = dev;
 148#endif
 149        return 0;
 150}
 151