git.sur5r.net Git - u-boot/blob - drivers/power/pmic/pmic_tps65217.c

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