drivers/power/pmic/pmic_tps65218.c

   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 <asm/errno.h>
  11 #include <power/pmic.h>
  12 #include <power/tps65218.h>
  13
  14 /**
  15  *  tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
  16  *                         register or bit field regardless of protection
  17  *                         level.
  18  *
  19  *  @prot_level:           Register password protection.  Use
  20  *                         TPS65218_PROT_LEVEL_NONE,
  21  *                         TPS65218_PROT_LEVEL_1 or TPS65218_PROT_LEVEL_2
  22  *  @dest_reg:             Register address to write.
  23  *  @dest_val:             Value to write.
  24  *  @mask:                 Bit mask (8 bits) to be applied.  Function will only
  25  *                         change bits that are set in the bit mask.
  26  *
  27  *  @return:               0 for success, not 0 on failure, as per the i2c API
  28  */
  29 int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
  30                        uchar mask)
  31 {
  32         uchar read_val;
  33         uchar xor_reg;
  34         int ret;
  35
  36         /*
  37          * If we are affecting only a bit field, read dest_reg and apply the
  38          * mask
  39          */
  40         if (mask != TPS65218_MASK_ALL_BITS) {
  41                 ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
  42                 if (ret)
  43                         return ret;
  44                 read_val &= (~mask);
  45                 read_val |= (dest_val & mask);
  46                 dest_val = read_val;
  47         }
  48
  49         if (prot_level > 0) {
  50                 xor_reg = dest_reg ^ TPS65218_PASSWORD_UNLOCK;
  51                 ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
  52                                 &xor_reg, 1);
  53                 if (ret)
  54                         return ret;
  55         }
  56
  57         ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
  58         if (ret)
  59                 return ret;
  60
  61         if (prot_level == TPS65218_PROT_LEVEL_2) {
  62                 ret = i2c_write(TPS65218_CHIP_PM, TPS65218_PASSWORD, 1,
  63                                 &xor_reg, 1);
  64                 if (ret)
  65                         return ret;
  66
  67                 ret = i2c_write(TPS65218_CHIP_PM, dest_reg, 1, &dest_val, 1);
  68                 if (ret)
  69                         return ret;
  70         }
  71
  72         return 0;
  73 }
  74
  75 /**
  76  * tps65218_voltage_update() - Function to change a voltage level, as this
  77  *                             is a multi-step process.
  78  * @dc_cntrl_reg:              DC voltage control register to change.
  79  * @volt_sel:                  New value for the voltage register
  80  * @return:                    0 for success, not 0 on failure.
  81  */
  82 int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
  83 {
  84         if ((dc_cntrl_reg != TPS65218_DCDC1) &&
  85             (dc_cntrl_reg != TPS65218_DCDC2))
  86                 return 1;
  87
  88         /* set voltage level */
  89         if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, dc_cntrl_reg, volt_sel,
  90                                TPS65218_MASK_ALL_BITS))
  91                 return 1;
  92
  93         /* set GO bit to initiate voltage transition */
  94         if (tps65218_reg_write(TPS65218_PROT_LEVEL_2, TPS65218_SLEW,
  95                                TPS65218_DCDC_GO, TPS65218_DCDC_GO))
  96                 return 1;
  97
  98         return 0;
  99 }
 100
 101 int power_tps65218_init(unsigned char bus)
 102 {
 103         static const char name[] = "TPS65218_PMIC";
 104         struct pmic *p = pmic_alloc();
 105
 106         if (!p) {
 107                 printf("%s: POWER allocation error!\n", __func__);
 108                 return -ENOMEM;
 109         }
 110
 111         p->name = name;
 112         p->interface = PMIC_I2C;
 113         p->number_of_regs = TPS65218_PMIC_NUM_OF_REGS;
 114         p->hw.i2c.addr = TPS65218_CHIP_PM;
 115         p->hw.i2c.tx_num = 1;
 116         p->bus = bus;
 117
 118         return 0;
 119 }