src/soc/nvidia/tegra132/power.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright 2013 Google Inc.
   5  * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  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 #include <arch/io.h>
  18 #include <assert.h>
  19 #include <console/console.h>
  20 #include <soc/addressmap.h>
  21 #include <soc/pmc.h>
  22 #include <soc/power.h>
  23
  24 static struct tegra_pmc_regs * const pmc = (void *)TEGRA_PMC_BASE;
  25
  26 static int partition_powered(int id)
  27 {
  28         return read32(&pmc->pwrgate_status) & (0x1 << id);
  29 }
  30
  31 void power_ungate_partition(uint32_t id)
  32 {
  33         printk(BIOS_INFO, "Ungating power partition %d.\n", id);
  34
  35         if (!partition_powered(id)) {
  36                 uint32_t pwrgate_toggle = read32(&pmc->pwrgate_toggle);
  37                 pwrgate_toggle &= ~(PMC_PWRGATE_TOGGLE_PARTID_MASK);
  38                 pwrgate_toggle |= (id << PMC_PWRGATE_TOGGLE_PARTID_SHIFT);
  39                 pwrgate_toggle |= PMC_PWRGATE_TOGGLE_START;
  40                 write32(&pmc->pwrgate_toggle, pwrgate_toggle);
  41
  42                 /* Wait for the request to be accepted. */
  43                 while (read32(&pmc->pwrgate_toggle) & PMC_PWRGATE_TOGGLE_START)
  44                         ;
  45                 printk(BIOS_DEBUG, "Power gate toggle request accepted.\n");
  46
  47                 /* Wait for the partition to be powered. */
  48                 while (!partition_powered(id))
  49                         ;
  50         }
  51
  52         printk(BIOS_INFO, "Ungated power partition %d.\n", id);
  53 }
  54
  55 uint8_t pmc_rst_status(void)
  56 {
  57         return read32(&pmc->rst_status) & PMC_RST_STATUS_SOURCE_MASK;
  58 }
  59
  60 static const char *pmc_rst_status_str[PMC_RST_STATUS_NUM_SOURCES] = {
  61         [PMC_RST_STATUS_SOURCE_POR] = "POR",
  62         [PMC_RST_STATUS_SOURCE_WATCHDOG] = "Watchdog",
  63         [PMC_RST_STATUS_SOURCE_SENSOR] = "Sensor",
  64         [PMC_RST_STATUS_SOURCE_SW_MAIN] = "SW Main",
  65         [PMC_RST_STATUS_SOURCE_LP0] = "LP0",
  66 };
  67
  68 void pmc_print_rst_status(void)
  69 {
  70         uint8_t rst_status = pmc_rst_status();
  71         assert(rst_status < PMC_RST_STATUS_NUM_SOURCES);
  72         printk(BIOS_INFO, "PMC Reset Status: %s\n",
  73                pmc_rst_status_str[rst_status]);
  74 }