drivers/power/domain/tegra186-power-domain.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2016, NVIDIA CORPORATION.
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <log.h>
   9 #include <malloc.h>
  10 #include <misc.h>
  11 #include <power-domain-uclass.h>
  12 #include <asm/arch-tegra/bpmp_abi.h>
  13
  14 #define UPDATE  BIT(0)
  15 #define ON      BIT(1)
  16
  17 static int tegra186_power_domain_request(struct power_domain *power_domain)
  18 {
  19         debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
  20               power_domain, power_domain->dev, power_domain->id);
  21
  22         return 0;
  23 }
  24
  25 static int tegra186_power_domain_free(struct power_domain *power_domain)
  26 {
  27         debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
  28               power_domain, power_domain->dev, power_domain->id);
  29
  30         return 0;
  31 }
  32
  33 static int tegra186_power_domain_common(struct power_domain *power_domain,
  34                                         bool on)
  35 {
  36         struct mrq_pg_update_state_request req;
  37         int on_state = on ? ON : 0;
  38         int ret;
  39
  40         req.partition_id = power_domain->id;
  41         req.logic_state = UPDATE | on_state;
  42         req.sram_state = UPDATE | on_state;
  43         /*
  44          * Drivers manage their own clocks so they don't get out of sync, and
  45          * since some power domains have many clocks, only a subset of which
  46          * are actually needed depending on use-case.
  47          */
  48         req.clock_state = UPDATE;
  49
  50         ret = misc_call(power_domain->dev->parent, MRQ_PG_UPDATE_STATE, &req,
  51                         sizeof(req), NULL, 0);
  52         if (ret < 0)
  53                 return ret;
  54
  55         return 0;
  56 }
  57
  58 static int tegra186_power_domain_on(struct power_domain *power_domain)
  59 {
  60         debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
  61               power_domain, power_domain->dev, power_domain->id);
  62
  63         return tegra186_power_domain_common(power_domain, true);
  64 }
  65
  66 static int tegra186_power_domain_off(struct power_domain *power_domain)
  67 {
  68         debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__,
  69               power_domain, power_domain->dev, power_domain->id);
  70
  71         return tegra186_power_domain_common(power_domain, false);
  72 }
  73
  74 struct power_domain_ops tegra186_power_domain_ops = {
  75         .request = tegra186_power_domain_request,
  76         .rfree = tegra186_power_domain_free,
  77         .on = tegra186_power_domain_on,
  78         .off = tegra186_power_domain_off,
  79 };
  80
  81 static int tegra186_power_domain_probe(struct udevice *dev)
  82 {
  83         debug("%s(dev=%p)\n", __func__, dev);
  84
  85         return 0;
  86 }
  87
  88 U_BOOT_DRIVER(tegra186_power_domain) = {
  89         .name = "tegra186_power_domain",
  90         .id = UCLASS_POWER_DOMAIN,
  91         .probe = tegra186_power_domain_probe,
  92         .ops = &tegra186_power_domain_ops,
  93 };