soc: apple: Move power-domain driver to the genpd dir

To simplify with maintenance let's move the apple power-domain driver to
the new genpd directory. Going forward, patches are intended to be managed
through a separate git tree, according to MAINTAINERS.

Cc: Hector Martin <marcan@marcan.st>
Cc: Sven Peter <sven@svenpeter.dev>
Cc: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Cc: <asahi@lists.linux.dev>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

2 files changed, 0 insertions, 328 deletions

diff --git a/drivers/soc/apple/Makefile b/drivers/soc/apple/Makefile
index e293770cf66d..b241e6a65e5b 100644
--- a/drivers/soc/apple/Makefile
+++ b/drivers/soc/apple/Makefile
@@ -1,6 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
-obj-$(CONFIG_APPLE_PMGR_PWRSTATE)	+= apple-pmgr-pwrstate.o
-
 obj-$(CONFIG_APPLE_RTKIT) += apple-rtkit.o
 apple-rtkit-y = rtkit.o rtkit-crashlog.o
 
diff --git a/drivers/soc/apple/apple-pmgr-pwrstate.c b/drivers/soc/apple/apple-pmgr-pwrstate.c
deleted file mode 100644
index d62a776c89a1..000000000000
--- a/drivers/soc/apple/apple-pmgr-pwrstate.c
+++ /dev/null
@@ -1,326 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only OR MIT
-/*
- * Apple SoC PMGR device power state driver
- *
- * Copyright The Asahi Linux Contributors
- */
-
-#include <linux/bitops.h>
-#include <linux/bitfield.h>
-#include <linux/err.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/platform_device.h>
-#include <linux/pm_domain.h>
-#include <linux/regmap.h>
-#include <linux/mfd/syscon.h>
-#include <linux/reset-controller.h>
-#include <linux/module.h>
-
-#define APPLE_PMGR_RESET        BIT(31)
-#define APPLE_PMGR_AUTO_ENABLE  BIT(28)
-#define APPLE_PMGR_PS_AUTO      GENMASK(27, 24)
-#define APPLE_PMGR_PS_MIN       GENMASK(19, 16)
-#define APPLE_PMGR_PARENT_OFF   BIT(11)
-#define APPLE_PMGR_DEV_DISABLE  BIT(10)
-#define APPLE_PMGR_WAS_CLKGATED BIT(9)
-#define APPLE_PMGR_WAS_PWRGATED BIT(8)
-#define APPLE_PMGR_PS_ACTUAL    GENMASK(7, 4)
-#define APPLE_PMGR_PS_TARGET    GENMASK(3, 0)
-
-#define APPLE_PMGR_FLAGS        (APPLE_PMGR_WAS_CLKGATED | APPLE_PMGR_WAS_PWRGATED)
-
-#define APPLE_PMGR_PS_ACTIVE    0xf
-#define APPLE_PMGR_PS_CLKGATE   0x4
-#define APPLE_PMGR_PS_PWRGATE   0x0
-
-#define APPLE_PMGR_PS_SET_TIMEOUT 100
-#define APPLE_PMGR_RESET_TIME 1
-
-struct apple_pmgr_ps {
-	struct device *dev;
-	struct generic_pm_domain genpd;
-	struct reset_controller_dev rcdev;
-	struct regmap *regmap;
-	u32 offset;
-	u32 min_state;
-};
-
-#define genpd_to_apple_pmgr_ps(_genpd) container_of(_genpd, struct apple_pmgr_ps, genpd)
-#define rcdev_to_apple_pmgr_ps(_rcdev) container_of(_rcdev, struct apple_pmgr_ps, rcdev)
-
-static int apple_pmgr_ps_set(struct generic_pm_domain *genpd, u32 pstate, bool auto_enable)
-{
-	int ret;
-	struct apple_pmgr_ps *ps = genpd_to_apple_pmgr_ps(genpd);
-	u32 reg;
-
-	ret = regmap_read(ps->regmap, ps->offset, &reg);
-	if (ret < 0)
-		return ret;
-
-	/* Resets are synchronous, and only work if the device is powered and clocked. */
-	if (reg & APPLE_PMGR_RESET && pstate != APPLE_PMGR_PS_ACTIVE)
-		dev_err(ps->dev, "PS %s: powering off with RESET active\n",
-			genpd->name);
-
-	reg &= ~(APPLE_PMGR_AUTO_ENABLE | APPLE_PMGR_FLAGS | APPLE_PMGR_PS_TARGET);
-	reg |= FIELD_PREP(APPLE_PMGR_PS_TARGET, pstate);
-
-	dev_dbg(ps->dev, "PS %s: pwrstate = 0x%x: 0x%x\n", genpd->name, pstate, reg);
-
-	regmap_write(ps->regmap, ps->offset, reg);
-
-	ret = regmap_read_poll_timeout_atomic(
-		ps->regmap, ps->offset, reg,
-		(FIELD_GET(APPLE_PMGR_PS_ACTUAL, reg) == pstate), 1,
-		APPLE_PMGR_PS_SET_TIMEOUT);
-	if (ret < 0)
-		dev_err(ps->dev, "PS %s: Failed to reach power state 0x%x (now: 0x%x)\n",
-			genpd->name, pstate, reg);
-
-	if (auto_enable) {
-		/* Not all devices implement this; this is a no-op where not implemented. */
-		reg &= ~APPLE_PMGR_FLAGS;
-		reg |= APPLE_PMGR_AUTO_ENABLE;
-		regmap_write(ps->regmap, ps->offset, reg);
-	}
-
-	return ret;
-}
-
-static bool apple_pmgr_ps_is_active(struct apple_pmgr_ps *ps)
-{
-	u32 reg = 0;
-
-	regmap_read(ps->regmap, ps->offset, &reg);
-	/*
-	 * We consider domains as active if they are actually on, or if they have auto-PM
-	 * enabled and the intended target is on.
-	 */
-	return (FIELD_GET(APPLE_PMGR_PS_ACTUAL, reg) == APPLE_PMGR_PS_ACTIVE ||
-		(FIELD_GET(APPLE_PMGR_PS_TARGET, reg) == APPLE_PMGR_PS_ACTIVE &&
-		 reg & APPLE_PMGR_AUTO_ENABLE));
-}
-
-static int apple_pmgr_ps_power_on(struct generic_pm_domain *genpd)
-{
-	return apple_pmgr_ps_set(genpd, APPLE_PMGR_PS_ACTIVE, true);
-}
-
-static int apple_pmgr_ps_power_off(struct generic_pm_domain *genpd)
-{
-	return apple_pmgr_ps_set(genpd, APPLE_PMGR_PS_PWRGATE, false);
-}
-
-static int apple_pmgr_reset_assert(struct reset_controller_dev *rcdev, unsigned long id)
-{
-	struct apple_pmgr_ps *ps = rcdev_to_apple_pmgr_ps(rcdev);
-	unsigned long flags;
-
-	spin_lock_irqsave(&ps->genpd.slock, flags);
-
-	if (ps->genpd.status == GENPD_STATE_OFF)
-		dev_err(ps->dev, "PS 0x%x: asserting RESET while powered down\n", ps->offset);
-
-	dev_dbg(ps->dev, "PS 0x%x: assert reset\n", ps->offset);
-	/* Quiesce device before asserting reset */
-	regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE,
-			   APPLE_PMGR_DEV_DISABLE);
-	regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_RESET,
-			   APPLE_PMGR_RESET);
-
-	spin_unlock_irqrestore(&ps->genpd.slock, flags);
-
-	return 0;
-}
-
-static int apple_pmgr_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id)
-{
-	struct apple_pmgr_ps *ps = rcdev_to_apple_pmgr_ps(rcdev);
-	unsigned long flags;
-
-	spin_lock_irqsave(&ps->genpd.slock, flags);
-
-	dev_dbg(ps->dev, "PS 0x%x: deassert reset\n", ps->offset);
-	regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_RESET, 0);
-	regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE, 0);
-
-	if (ps->genpd.status == GENPD_STATE_OFF)
-		dev_err(ps->dev, "PS 0x%x: RESET was deasserted while powered down\n", ps->offset);
-
-	spin_unlock_irqrestore(&ps->genpd.slock, flags);
-
-	return 0;
-}
-
-static int apple_pmgr_reset_reset(struct reset_controller_dev *rcdev, unsigned long id)
-{
-	int ret;
-
-	ret = apple_pmgr_reset_assert(rcdev, id);
-	if (ret)
-		return ret;
-
-	usleep_range(APPLE_PMGR_RESET_TIME, 2 * APPLE_PMGR_RESET_TIME);
-
-	return apple_pmgr_reset_deassert(rcdev, id);
-}
-
-static int apple_pmgr_reset_status(struct reset_controller_dev *rcdev, unsigned long id)
-{
-	struct apple_pmgr_ps *ps = rcdev_to_apple_pmgr_ps(rcdev);
-	u32 reg = 0;
-
-	regmap_read(ps->regmap, ps->offset, &reg);
-
-	return !!(reg & APPLE_PMGR_RESET);
-}
-
-const struct reset_control_ops apple_pmgr_reset_ops = {
-	.assert		= apple_pmgr_reset_assert,
-	.deassert	= apple_pmgr_reset_deassert,
-	.reset		= apple_pmgr_reset_reset,
-	.status		= apple_pmgr_reset_status,
-};
-
-static int apple_pmgr_reset_xlate(struct reset_controller_dev *rcdev,
-				  const struct of_phandle_args *reset_spec)
-{
-	return 0;
-}
-
-static int apple_pmgr_ps_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct device_node *node = dev->of_node;
-	struct apple_pmgr_ps *ps;
-	struct regmap *regmap;
-	struct of_phandle_iterator it;
-	int ret;
-	const char *name;
-	bool active;
-
-	regmap = syscon_node_to_regmap(node->parent);
-	if (IS_ERR(regmap))
-		return PTR_ERR(regmap);
-
-	ps = devm_kzalloc(dev, sizeof(*ps), GFP_KERNEL);
-	if (!ps)
-		return -ENOMEM;
-
-	ps->dev = dev;
-	ps->regmap = regmap;
-
-	ret = of_property_read_string(node, "label", &name);
-	if (ret < 0) {
-		dev_err(dev, "missing label property\n");
-		return ret;
-	}
-
-	ret = of_property_read_u32(node, "reg", &ps->offset);
-	if (ret < 0) {
-		dev_err(dev, "missing reg property\n");
-		return ret;
-	}
-
-	ps->genpd.flags |= GENPD_FLAG_IRQ_SAFE;
-	ps->genpd.name = name;
-	ps->genpd.power_on = apple_pmgr_ps_power_on;
-	ps->genpd.power_off = apple_pmgr_ps_power_off;
-
-	ret = of_property_read_u32(node, "apple,min-state", &ps->min_state);
-	if (ret == 0 && ps->min_state <= APPLE_PMGR_PS_ACTIVE)
-		regmap_update_bits(regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_PS_MIN,
-				   FIELD_PREP(APPLE_PMGR_PS_MIN, ps->min_state));
-
-	active = apple_pmgr_ps_is_active(ps);
-	if (of_property_read_bool(node, "apple,always-on")) {
-		ps->genpd.flags |= GENPD_FLAG_ALWAYS_ON;
-		if (!active) {
-			dev_warn(dev, "always-on domain %s is not on at boot\n", name);
-			/* Turn it on so pm_genpd_init does not fail */
-			active = apple_pmgr_ps_power_on(&ps->genpd) == 0;
-		}
-	}
-
-	/* Turn on auto-PM if the domain is already on */
-	if (active)
-		regmap_update_bits(regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_AUTO_ENABLE,
-				   APPLE_PMGR_AUTO_ENABLE);
-
-	ret = pm_genpd_init(&ps->genpd, NULL, !active);
-	if (ret < 0) {
-		dev_err(dev, "pm_genpd_init failed\n");
-		return ret;
-	}
-
-	ret = of_genpd_add_provider_simple(node, &ps->genpd);
-	if (ret < 0) {
-		dev_err(dev, "of_genpd_add_provider_simple failed\n");
-		return ret;
-	}
-
-	of_for_each_phandle(&it, ret, node, "power-domains", "#power-domain-cells", -1) {
-		struct of_phandle_args parent, child;
-
-		parent.np = it.node;
-		parent.args_count = of_phandle_iterator_args(&it, parent.args, MAX_PHANDLE_ARGS);
-		child.np = node;
-		child.args_count = 0;
-		ret = of_genpd_add_subdomain(&parent, &child);
-
-		if (ret == -EPROBE_DEFER) {
-			of_node_put(parent.np);
-			goto err_remove;
-		} else if (ret < 0) {
-			dev_err(dev, "failed to add to parent domain: %d (%s -> %s)\n",
-				ret, it.node->name, node->name);
-			of_node_put(parent.np);
-			goto err_remove;
-		}
-	}
-
-	/*
-	 * Do not participate in regular PM; parent power domains are handled via the
-	 * genpd hierarchy.
-	 */
-	pm_genpd_remove_device(dev);
-
-	ps->rcdev.owner = THIS_MODULE;
-	ps->rcdev.nr_resets = 1;
-	ps->rcdev.ops = &apple_pmgr_reset_ops;
-	ps->rcdev.of_node = dev->of_node;
-	ps->rcdev.of_reset_n_cells = 0;
-	ps->rcdev.of_xlate = apple_pmgr_reset_xlate;
-
-	ret = devm_reset_controller_register(dev, &ps->rcdev);
-	if (ret < 0)
-		goto err_remove;
-
-	return 0;
-err_remove:
-	of_genpd_del_provider(node);
-	pm_genpd_remove(&ps->genpd);
-	return ret;
-}
-
-static const struct of_device_id apple_pmgr_ps_of_match[] = {
-	{ .compatible = "apple,pmgr-pwrstate" },
-	{}
-};
-
-MODULE_DEVICE_TABLE(of, apple_pmgr_ps_of_match);
-
-static struct platform_driver apple_pmgr_ps_driver = {
-	.probe = apple_pmgr_ps_probe,
-	.driver = {
-		.name = "apple-pmgr-pwrstate",
-		.of_match_table = apple_pmgr_ps_of_match,
-	},
-};
-
-MODULE_AUTHOR("Hector Martin <marcan@marcan.st>");
-MODULE_DESCRIPTION("PMGR power state driver for Apple SoCs");
-
-module_platform_driver(apple_pmgr_ps_driver);