board/karo/tx6/rn5t618.c

   1 /*
   2  * Copyright (C) 2014 Lothar Waßmann <LW@KARO-electronics.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <common.h>
  19 #include <i2c.h>
  20
  21 #include "../common/karo.h"
  22 #include "pmic.h"
  23
  24 #define RN5T618_NOETIMSET       0x11
  25 #define RN5T618_LDORTC1_SLOT    0x2a
  26 #define RN5T618_DC1CTL          0x2c
  27 #define RN5T618_DC1CTL2         0x2d
  28 #define RN5T618_DC2CTL          0x2e
  29 #define RN5T618_DC2CTL2         0x2f
  30 #define RN5T618_DC3CTL          0x30
  31 #define RN5T618_DC3CTL2         0x31
  32 #define RN5T618_DC1DAC          0x36 /* CORE */
  33 #define RN5T618_DC2DAC          0x37 /* SOC */
  34 #define RN5T618_DC3DAC          0x38 /* DDR */
  35 #define RN5T618_DC1DAC_SLP      0x3b
  36 #define RN5T618_DC2DAC_SLP      0x3c
  37 #define RN5T618_DC3DAC_SLP      0x3d
  38 #define RN5T618_LDOEN1          0x44
  39 #define RN5T618_LDOEN2          0x45
  40 #define RN5T618_LDODIS          0x46
  41 #define RN5T618_LDO3DAC         0x4e /* IO */
  42 #define RN5T618_LDORTCDAC       0x56 /* VBACKUP */
  43
  44 #define VDD_RTC_VAL             mV_to_regval_rtc(3000)
  45 #define VDD_HIGH_VAL            mV_to_regval3(3000)
  46 #define VDD_HIGH_VAL_LP         mV_to_regval3(3000)
  47 #define VDD_CORE_VAL            mV_to_regval(1425)              /* DCDC1 */
  48 #define VDD_CORE_VAL_LP         mV_to_regval(900)
  49 #define VDD_SOC_VAL             mV_to_regval(1425)              /* DCDC2 */
  50 #define VDD_SOC_VAL_LP          mV_to_regval(900)
  51 #define VDD_DDR_VAL             mV_to_regval(1500)              /* DCDC3 */
  52 #define VDD_DDR_VAL_LP          mV_to_regval(1500)
  53
  54 /* calculate voltages in 10mV */
  55 #define v2r(v,n,m)              DIV_ROUND(((((v) < (n)) ? (n) : (v)) - (n)), (m))
  56 #define r2v(r,n,m)              (((r) * (m) + (n)) / 10)
  57
  58 /* DCDC1-3 */
  59 #define mV_to_regval(mV)        v2r((mV) * 10, 6000, 125)
  60 #define regval_to_mV(r)         r2v(r, 6000, 125)
  61
  62 /* LDO1-2 */
  63 #define mV_to_regval2(mV)       v2r((mV) * 10, 9000, 250)
  64 #define regval2_to_mV(r)        r2v(r, 9000, 250)
  65
  66 /* LDO3 */
  67 #define mV_to_regval3(mV)       v2r((mV) * 10, 6000, 250)
  68 #define regval3_to_mV(r)        r2v(r, 6000, 250)
  69
  70 /* LDORTC */
  71 #define mV_to_regval_rtc(mV)    v2r((mV) * 10, 17000, 250)
  72 #define regval_rtc_to_mV(r)     r2v(r, 17000, 250)
  73
  74 static struct pmic_regs rn5t618_regs[] = {
  75         { RN5T618_NOETIMSET, 0, },
  76         { RN5T618_DC1DAC, VDD_CORE_VAL, },
  77         { RN5T618_DC2DAC, VDD_SOC_VAL, },
  78         { RN5T618_DC3DAC, VDD_DDR_VAL, },
  79         { RN5T618_DC1DAC_SLP, VDD_CORE_VAL_LP, },
  80         { RN5T618_DC2DAC_SLP, VDD_SOC_VAL_LP, },
  81         { RN5T618_DC3DAC_SLP, VDD_DDR_VAL_LP, },
  82         { RN5T618_LDOEN1, 0x01f, ~0x1f, },
  83         { RN5T618_LDOEN2, 0x10, ~0x30, },
  84         { RN5T618_LDODIS, 0x00, },
  85         { RN5T618_LDO3DAC, VDD_HIGH_VAL, },
  86         { RN5T618_LDORTCDAC, VDD_RTC_VAL, },
  87         { RN5T618_LDORTC1_SLOT, 0x0f, ~0x3f, },
  88 };
  89
  90 static int rn5t618_setup_regs(uchar slave_addr, struct pmic_regs *r,
  91                         size_t count)
  92 {
  93         int ret;
  94         int i;
  95
  96         for (i = 0; i < count; i++, r++) {
  97 #ifdef DEBUG
  98                 unsigned char value;
  99
 100                 ret = i2c_read(slave_addr, r->addr, 1, &value, 1);
 101                 if (ret) {
 102                         printf("%s: failed to read PMIC register %02x: %d\n",
 103                                 __func__, r->addr, ret);
 104                         return ret;
 105                 }
 106                 if ((value & ~r->mask) != r->val) {
 107                         printf("Changing PMIC reg %02x from %02x to %02x\n",
 108                                 r->addr, value, r->val);
 109                 }
 110 #endif
 111                 ret = i2c_write(slave_addr, r->addr, 1, &r->val, 1);
 112                 if (ret) {
 113                         printf("%s: failed to write PMIC register %02x: %d\n",
 114                                 __func__, r->addr, ret);
 115                         return ret;
 116                 }
 117 #ifdef DEBUG
 118                 ret = i2c_read(slave_addr, r->addr, 1, &value, 1);
 119                 if (ret) {
 120                         printf("%s: failed to read PMIC register %02x: %d\n",
 121                                 __func__, r->addr, ret);
 122                         return ret;
 123                 }
 124                 if (value != r->val) {
 125                         printf("Failed to set PMIC reg %02x to %02x; actual value: %02x\n",
 126                                 r->addr, r->val, value);
 127                 }
 128 #endif
 129         }
 130         return 0;
 131 }
 132
 133 int rn5t618_pmic_setup(uchar slave_addr, struct pmic_regs *regs,
 134                 size_t count)
 135 {
 136         int ret;
 137         unsigned char value;
 138
 139         ret = i2c_read(slave_addr, 0x11, 1, &value, 1);
 140         if (ret) {
 141                 printf("%s: i2c_read error: %d\n", __func__, ret);
 142                 return ret;
 143         }
 144
 145         ret = rn5t618_setup_regs(slave_addr, rn5t618_regs,
 146                                 ARRAY_SIZE(rn5t618_regs));
 147         if (ret)
 148                 return ret;
 149
 150         ret = i2c_read(slave_addr, RN5T618_DC1DAC, 1, &value, 1);
 151         if (ret == 0) {
 152                 printf("VDDCORE set to %umV\n", regval_to_mV(value));
 153         } else {
 154                 printf("Failed to read VDDCORE register setting\n");
 155         }
 156
 157         ret = i2c_read(slave_addr, RN5T618_DC2DAC, 1, &value, 1);
 158         if (ret == 0) {
 159                 printf("VDDSOC  set to %umV\n", regval_to_mV(value));
 160         } else {
 161                 printf("Failed to read VDDSOC register setting\n");
 162         }
 163
 164         return ret;
 165 }