arch/arm/mach-tegra/tegra20/pmu.c

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  * (C) Copyright 2010,2011 NVIDIA Corporation <www.nvidia.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <i2c.h>
  10 #include <tps6586x.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/tegra.h>
  13 #include <asm/arch-tegra/ap.h>
  14 #include <asm/arch-tegra/tegra_i2c.h>
  15 #include <asm/arch-tegra/sys_proto.h>
  16
  17 #define VDD_CORE_NOMINAL_T25    0x17    /* 1.3v */
  18 #define VDD_CPU_NOMINAL_T25     0x10    /* 1.125v */
  19
  20 #define VDD_CORE_NOMINAL_T20    0x16    /* 1.275v */
  21 #define VDD_CPU_NOMINAL_T20     0x0f    /* 1.1v */
  22
  23 #define VDD_RELATION            0x02    /*  50mv */
  24 #define VDD_TRANSITION_STEP     0x06    /* 150mv */
  25 #define VDD_TRANSITION_RATE     0x06    /* 3.52mv/us */
  26
  27 #define PMI_I2C_ADDRESS 0x34    /* chip requires this address */
  28
  29 int pmu_set_nominal(void)
  30 {
  31         struct udevice *bus, *dev;
  32         int core, cpu;
  33         int ret;
  34
  35         /* by default, the table has been filled with T25 settings */
  36         switch (tegra_get_chip_sku()) {
  37         case TEGRA_SOC_T20:
  38                 core = VDD_CORE_NOMINAL_T20;
  39                 cpu = VDD_CPU_NOMINAL_T20;
  40                 break;
  41         case TEGRA_SOC_T25:
  42                 core = VDD_CORE_NOMINAL_T25;
  43                 cpu = VDD_CPU_NOMINAL_T25;
  44                 break;
  45         default:
  46                 debug("%s: Unknown SKU id\n", __func__);
  47                 return -1;
  48         }
  49
  50         ret = tegra_i2c_get_dvc_bus(&bus);
  51         if (ret) {
  52                 debug("%s: Cannot find DVC I2C bus\n", __func__);
  53                 return ret;
  54         }
  55         ret = i2c_get_chip(bus, PMI_I2C_ADDRESS, 1, &dev);
  56         if (ret) {
  57                 debug("%s: Cannot find DVC I2C chip\n", __func__);
  58                 return ret;
  59         }
  60
  61         tps6586x_init(dev);
  62         tps6586x_set_pwm_mode(TPS6586X_PWM_SM1);
  63         return tps6586x_adjust_sm0_sm1(core, cpu, VDD_TRANSITION_STEP,
  64                                 VDD_TRANSITION_RATE, VDD_RELATION);
  65 }