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 "pmic.h"
  22
  23 #define RN5T618_NOETIMSET       0x11
  24 #define RN5T618_LDORTC1_SLOT    0x2a
  25 #define RN5T618_DC1CTL          0x2c
  26 #define RN5T618_DC1CTL2         0x2d
  27 #define RN5T618_DC2CTL          0x2e
  28 #define RN5T618_DC2CTL2         0x2f
  29 #define RN5T618_DC3CTL          0x30
  30 #define RN5T618_DC3CTL2         0x31
  31 #define RN5T618_DC1DAC          0x36 /* CORE */
  32 #define RN5T618_DC2DAC          0x37 /* SOC */
  33 #define RN5T618_DC3DAC          0x38 /* DDR */
  34 #define RN5T618_DC1DAC_SLP      0x3b
  35 #define RN5T618_DC2DAC_SLP      0x3c
  36 #define RN5T618_DC3DAC_SLP      0x3d
  37 #define RN5T618_LDOEN1          0x44
  38 #define RN5T618_LDODIS          0x46
  39 #define RN5T618_LDOEN2          0x48
  40 #define RN5T618_LDO3DAC         0x4e /* IO */
  41 #define RN5T618_LDORTCDAC       0x56 /* VBACKUP */
  42
  43 #define VDD_RTC_VAL             mV_to_regval_rtc(3000)
  44 #define VDD_HIGH_VAL            mV_to_regval3(3000)
  45 #define VDD_HIGH_VAL_LP         mV_to_regval3(3000)
  46 #define VDD_CORE_VAL            mV_to_regval(1425)              /* DCDC1 */
  47 #define VDD_CORE_VAL_LP         mV_to_regval(900)
  48 #define VDD_SOC_VAL             mV_to_regval(1425)              /* DCDC2 */
  49 #define VDD_SOC_VAL_LP          mV_to_regval(900)
  50 #define VDD_DDR_VAL             mV_to_regval(1500)              /* DCDC3 */
  51 #define VDD_DDR_VAL_LP          mV_to_regval(1500)
  52
  53 /* calculate voltages in 10mV */
  54 #define v2r(v,n,m)              DIV_ROUND(((((v) < (n)) ? (n) : (v)) - (n)), (m))
  55 #define r2v(r,n,m)              (((r) * (m) + (n)) / 10)
  56
  57 /* DCDC1-3 */
  58 #define mV_to_regval(mV)        v2r((mV) * 10, 6000, 125)
  59 #define regval_to_mV(r)         r2v(r, 6000, 125)
  60
  61 /* LDO1-2 */
  62 #define mV_to_regval2(mV)       v2r((mV) * 10, 9000, 250)
  63 #define regval2_to_mV(r)        r2v(r, 9000, 250)
  64
  65 /* LDO3 */
  66 #define mV_to_regval3(mV)       v2r((mV) * 10, 6000, 250)
  67 #define regval3_to_mV(r)        r2v(r, 6000, 250)
  68
  69 /* LDORTC */
  70 #define mV_to_regval_rtc(mV)    v2r((mV) * 10, 17000, 250)
  71 #define regval_rtc_to_mV(r)     r2v(r, 17000, 250)
  72
  73 static struct rn5t618_regs {
  74         u8 addr;
  75         u8 val;
  76         u8 mask;
  77 } rn5t618_regs[] = {
  78         { RN5T618_NOETIMSET, 0, },
  79         { RN5T618_DC1DAC, VDD_CORE_VAL, },
  80         { RN5T618_DC2DAC, VDD_SOC_VAL, },
  81         { RN5T618_DC3DAC, VDD_DDR_VAL, },
  82         { RN5T618_DC1DAC_SLP, VDD_CORE_VAL_LP, },
  83         { RN5T618_DC2DAC_SLP, VDD_SOC_VAL_LP, },
  84         { RN5T618_DC3DAC_SLP, VDD_DDR_VAL_LP, },
  85         { RN5T618_LDOEN1, 0x01f, ~0x1f, },
  86         { RN5T618_LDOEN2, 0x10, ~0x30, },
  87         { RN5T618_LDODIS, 0x00, },
  88         { RN5T618_LDO3DAC, VDD_HIGH_VAL, },
  89         { RN5T618_LDORTCDAC, VDD_RTC_VAL, },
  90         { RN5T618_LDORTC1_SLOT, 0x0f, ~0x3f, },
  91 };
  92
  93 static int rn5t618_setup_regs(uchar slave_addr, struct rn5t618_regs *r,
  94                         size_t count)
  95 {
  96         int ret;
  97         int i;
  98
  99         for (i = 0; i < count; i++, r++) {
 100 #ifdef DEBUG
 101                 unsigned char value;
 102
 103                 ret = i2c_read(slave_addr, r->addr, 1, &value, 1);
 104                 if ((value & ~r->mask) != r->val) {
 105                         printf("Changing PMIC reg %02x from %02x to %02x\n",
 106                                 r->addr, value, r->val);
 107                 }
 108                 if (ret) {
 109                         printf("%s: failed to read PMIC register %02x: %d\n",
 110                                 __func__, r->addr, ret);
 111                         return ret;
 112                 }
 113 #endif
 114                 ret = i2c_write(slave_addr, r->addr, 1, &r->val, 1);
 115                 if (ret) {
 116                         printf("%s: failed to write PMIC register %02x: %d\n",
 117                                 __func__, r->addr, ret);
 118                         return ret;
 119                 }
 120         }
 121         return 0;
 122 }
 123
 124 int rn5t618_pmic_setup(uchar slave_addr)
 125 {
 126         int ret;
 127         unsigned char value;
 128
 129         ret = i2c_read(slave_addr, 0x11, 1, &value, 1);
 130         if (ret) {
 131                 printf("%s: i2c_read error: %d\n", __func__, ret);
 132                 return ret;
 133         }
 134
 135         ret = rn5t618_setup_regs(slave_addr, rn5t618_regs,
 136                                 ARRAY_SIZE(rn5t618_regs));
 137         if (ret)
 138                 return ret;
 139
 140         ret = i2c_read(slave_addr, RN5T618_DC1DAC, 1, &value, 1);
 141         if (ret == 0) {
 142                 printf("VDDCORE set to %umV\n", regval_to_mV(value));
 143         } else {
 144                 printf("Failed to read VDDCORE register setting\n");
 145         }
 146
 147         ret = i2c_read(slave_addr, RN5T618_DC2DAC, 1, &value, 1);
 148         if (ret == 0) {
 149                 printf("VDDSOC  set to %umV\n", regval_to_mV(value));
 150         } else {
 151                 printf("Failed to read VDDSOC register setting\n");
 152         }
 153
 154         return ret;
 155 }