mirror of
https://github.com/AsahiLinux/u-boot
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20874a6072
In case the ops is not implemented, return 0 in the core right away. This is better than having multiple copies of functions which just return 0 in each power domain driver. Drop all those empty functions. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Patrick Delaunay <patrick.delaunay@foss.st.com> Cc: Simon Glass <sjg@chromium.org>
154 lines
3.7 KiB
C
154 lines
3.7 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 <dm/device-internal.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 <reset-uclass.h>
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#include <regmap.h>
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#include <syscon.h>
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#define APPLE_PMGR_RESET BIT(31)
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#define APPLE_PMGR_DEV_DISABLE BIT(10)
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#define APPLE_PMGR_WAS_CLKGATED BIT(9)
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#define APPLE_PMGR_WAS_PWRGATED BIT(8)
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#define APPLE_PMGR_PS_ACTUAL GENMASK(7, 4)
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#define APPLE_PMGR_PS_TARGET GENMASK(3, 0)
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#define APPLE_PMGR_FLAGS (APPLE_PMGR_WAS_CLKGATED | APPLE_PMGR_WAS_PWRGATED)
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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_reset_of_xlate(struct reset_ctl *reset_ctl,
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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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return -EINVAL;
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return 0;
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}
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static int apple_reset_assert(struct reset_ctl *reset_ctl)
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{
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struct apple_pmgr_priv *priv = dev_get_priv(reset_ctl->dev->parent);
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regmap_update_bits(priv->regmap, priv->offset,
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APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE,
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APPLE_PMGR_DEV_DISABLE);
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regmap_update_bits(priv->regmap, priv->offset,
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APPLE_PMGR_FLAGS | APPLE_PMGR_RESET,
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APPLE_PMGR_RESET);
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return 0;
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}
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static int apple_reset_deassert(struct reset_ctl *reset_ctl)
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{
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struct apple_pmgr_priv *priv = dev_get_priv(reset_ctl->dev->parent);
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regmap_update_bits(priv->regmap, priv->offset,
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APPLE_PMGR_FLAGS | APPLE_PMGR_RESET, 0);
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regmap_update_bits(priv->regmap, priv->offset,
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APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE, 0);
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return 0;
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}
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struct reset_ops apple_reset_ops = {
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.of_xlate = apple_reset_of_xlate,
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.rst_assert = apple_reset_assert,
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.rst_deassert = apple_reset_deassert,
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};
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static struct driver apple_reset_driver = {
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.name = "apple_reset",
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.id = UCLASS_RESET,
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.ops = &apple_reset_ops,
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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_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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struct udevice *child;
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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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device_bind(dev, &apple_reset_driver, "apple_reset", NULL,
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dev_ofnode(dev), &child);
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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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.on = apple_pmgr_on,
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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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