In Tegra186, SoC power domains are manipulated using IPC requests to the BPMP (Boot and Power Management Processor). This change implements a driver that does that. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>master
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/*
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* Copyright (c) 2016, NVIDIA CORPORATION. |
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* |
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* SPDX-License-Identifier: GPL-2.0 |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <misc.h> |
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#include <power-domain-uclass.h> |
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#include <asm/arch-tegra/bpmp_abi.h> |
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#define UPDATE BIT(0) |
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#define ON BIT(1) |
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static int tegra186_power_domain_request(struct power_domain *power_domain) |
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{ |
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debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__, |
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power_domain, power_domain->dev, power_domain->id); |
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return 0; |
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} |
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static int tegra186_power_domain_free(struct power_domain *power_domain) |
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{ |
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debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__, |
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power_domain, power_domain->dev, power_domain->id); |
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return 0; |
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} |
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static int tegra186_power_domain_common(struct power_domain *power_domain, |
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bool on) |
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{ |
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struct mrq_pg_update_state_request req; |
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int on_state = on ? ON : 0; |
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int ret; |
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req.partition_id = power_domain->id; |
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req.logic_state = UPDATE | on_state; |
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req.sram_state = UPDATE | on_state; |
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/*
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* Drivers manage their own clocks so they don't get out of sync, and |
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* since some power domains have many clocks, only a subset of which |
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* are actually needed depending on use-case. |
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*/ |
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req.clock_state = UPDATE; |
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ret = misc_call(power_domain->dev->parent, MRQ_PG_UPDATE_STATE, &req, |
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sizeof(req), NULL, 0); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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static int tegra186_power_domain_on(struct power_domain *power_domain) |
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{ |
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debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__, |
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power_domain, power_domain->dev, power_domain->id); |
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return tegra186_power_domain_common(power_domain, true); |
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} |
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static int tegra186_power_domain_off(struct power_domain *power_domain) |
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{ |
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debug("%s(power_domain=%p) (dev=%p, id=%lu)\n", __func__, |
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power_domain, power_domain->dev, power_domain->id); |
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return tegra186_power_domain_common(power_domain, false); |
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} |
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struct power_domain_ops tegra186_power_domain_ops = { |
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.request = tegra186_power_domain_request, |
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.free = tegra186_power_domain_free, |
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.on = tegra186_power_domain_on, |
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.off = tegra186_power_domain_off, |
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}; |
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static int tegra186_power_domain_probe(struct udevice *dev) |
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{ |
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debug("%s(dev=%p)\n", __func__, dev); |
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return 0; |
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} |
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U_BOOT_DRIVER(tegra186_power_domain) = { |
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.name = "tegra186_power_domain", |
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.id = UCLASS_POWER_DOMAIN, |
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.probe = tegra186_power_domain_probe, |
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.ops = &tegra186_power_domain_ops, |
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}; |
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