mirror of
https://github.com/AsahiLinux/u-boot
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97187d5e37
This driver supports power domains for the power management controller found on Apple SoCs. Signed-off-by: Mark Kettenis <kettenis@openbsd.org> Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com> Reviewed-by: Simon Glass <sjg@chromium.org>
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2021 Mark Kettenis <kettenis@openbsd.org>
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <dm.h>
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#include <linux/err.h>
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#include <linux/bitfield.h>
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#include <power-domain-uclass.h>
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#include <regmap.h>
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#include <syscon.h>
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#define APPLE_PMGR_PS_TARGET GENMASK(3, 0)
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#define APPLE_PMGR_PS_ACTUAL GENMASK(7, 4)
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#define APPLE_PMGR_PS_ACTIVE 0xf
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#define APPLE_PMGR_PS_PWRGATE 0x0
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#define APPLE_PMGR_PS_SET_TIMEOUT_US 100
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struct apple_pmgr_priv {
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struct regmap *regmap;
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u32 offset; /* offset within regmap for this domain */
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};
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static int apple_pmgr_request(struct power_domain *power_domain)
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{
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return 0;
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}
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static int apple_pmgr_rfree(struct power_domain *power_domain)
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{
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return 0;
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}
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static int apple_pmgr_ps_set(struct power_domain *power_domain, u32 pstate)
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{
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struct apple_pmgr_priv *priv = dev_get_priv(power_domain->dev);
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uint reg;
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regmap_update_bits(priv->regmap, priv->offset, APPLE_PMGR_PS_TARGET,
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FIELD_PREP(APPLE_PMGR_PS_TARGET, pstate));
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return regmap_read_poll_timeout(
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priv->regmap, priv->offset, reg,
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(FIELD_GET(APPLE_PMGR_PS_ACTUAL, reg) == pstate), 1,
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APPLE_PMGR_PS_SET_TIMEOUT_US);
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}
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static int apple_pmgr_on(struct power_domain *power_domain)
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{
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return apple_pmgr_ps_set(power_domain, APPLE_PMGR_PS_ACTIVE);
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}
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static int apple_pmgr_off(struct power_domain *power_domain)
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{
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return 0;
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}
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static int apple_pmgr_of_xlate(struct power_domain *power_domain,
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struct ofnode_phandle_args *args)
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{
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if (args->args_count != 0) {
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debug("Invalid args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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return 0;
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}
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static const struct udevice_id apple_pmgr_ids[] = {
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{ .compatible = "apple,pmgr-pwrstate" },
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{ /* sentinel */ }
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};
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static int apple_pmgr_probe(struct udevice *dev)
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{
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struct apple_pmgr_priv *priv = dev_get_priv(dev);
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int ret;
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ret = dev_power_domain_on(dev);
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if (ret)
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return ret;
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priv->regmap = syscon_get_regmap(dev->parent);
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if (IS_ERR(priv->regmap))
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return PTR_ERR(priv->regmap);
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ret = dev_read_u32(dev, "reg", &priv->offset);
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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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struct power_domain_ops apple_pmgr_ops = {
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.request = apple_pmgr_request,
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.rfree = apple_pmgr_rfree,
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.on = apple_pmgr_on,
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.off = apple_pmgr_off,
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.of_xlate = apple_pmgr_of_xlate,
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};
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U_BOOT_DRIVER(apple_pmgr) = {
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.name = "apple_pmgr",
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.id = UCLASS_POWER_DOMAIN,
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.of_match = apple_pmgr_ids,
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.ops = &apple_pmgr_ops,
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.probe = apple_pmgr_probe,
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.priv_auto = sizeof(struct apple_pmgr_priv),
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};
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