mirror of
https://github.com/brain-hackers/u-boot-brain
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61f5ddcb7a
Many SoCs allow power to be applied to or removed from portions of the SoC (power domains). This may be used to save power. This API provides the means to control such power management hardware. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Simon Glass <sjg@chromium.org>
105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
/*
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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 <power-domain-uclass.h>
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#include <asm/io.h>
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#include <asm/power-domain.h>
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#define SANDBOX_POWER_DOMAINS 3
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struct sandbox_power_domain {
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bool on[SANDBOX_POWER_DOMAINS];
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};
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static int sandbox_power_domain_request(struct power_domain *power_domain)
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{
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debug("%s(power_domain=%p)\n", __func__, power_domain);
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if (power_domain->id >= SANDBOX_POWER_DOMAINS)
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return -EINVAL;
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return 0;
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}
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static int sandbox_power_domain_free(struct power_domain *power_domain)
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{
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debug("%s(power_domain=%p)\n", __func__, power_domain);
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return 0;
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}
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static int sandbox_power_domain_on(struct power_domain *power_domain)
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{
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struct sandbox_power_domain *sbr = dev_get_priv(power_domain->dev);
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debug("%s(power_domain=%p)\n", __func__, power_domain);
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sbr->on[power_domain->id] = true;
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return 0;
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}
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static int sandbox_power_domain_off(struct power_domain *power_domain)
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{
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struct sandbox_power_domain *sbr = dev_get_priv(power_domain->dev);
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debug("%s(power_domain=%p)\n", __func__, power_domain);
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sbr->on[power_domain->id] = false;
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return 0;
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}
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static int sandbox_power_domain_bind(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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static int sandbox_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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static const struct udevice_id sandbox_power_domain_ids[] = {
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{ .compatible = "sandbox,power-domain" },
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{ }
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};
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struct power_domain_ops sandbox_power_domain_ops = {
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.request = sandbox_power_domain_request,
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.free = sandbox_power_domain_free,
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.on = sandbox_power_domain_on,
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.off = sandbox_power_domain_off,
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};
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U_BOOT_DRIVER(sandbox_power_domain) = {
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.name = "sandbox_power_domain",
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.id = UCLASS_POWER_DOMAIN,
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.of_match = sandbox_power_domain_ids,
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.bind = sandbox_power_domain_bind,
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.probe = sandbox_power_domain_probe,
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.priv_auto_alloc_size = sizeof(struct sandbox_power_domain),
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.ops = &sandbox_power_domain_ops,
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};
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int sandbox_power_domain_query(struct udevice *dev, unsigned long id)
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{
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struct sandbox_power_domain *sbr = dev_get_priv(dev);
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debug("%s(dev=%p, id=%ld)\n", __func__, dev, id);
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if (id >= SANDBOX_POWER_DOMAINS)
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return -EINVAL;
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return sbr->on[id];
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}
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