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 <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 */
  29int 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 */
  82int 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
 101int 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}
 120