1 // SPDX-License-Identifier: GPL-2.0-only OR MIT
3  * Apple SoC PMGR device power state driver
17 #include <linux/reset-controller.h>
58 	ret = regmap_read(ps->regmap, ps->offset, &reg);  in apple_pmgr_ps_set()
64 		dev_err(ps->dev, "PS %s: powering off with RESET active\n",  in apple_pmgr_ps_set()
65 			genpd->name);  in apple_pmgr_ps_set()
70 	dev_dbg(ps->dev, "PS %s: pwrstate = 0x%x: 0x%x\n", genpd->name, pstate, reg);  in apple_pmgr_ps_set()
72 	regmap_write(ps->regmap, ps->offset, reg);  in apple_pmgr_ps_set()
75 		ps->regmap, ps->offset, reg,  in apple_pmgr_ps_set()
79 		dev_err(ps->dev, "PS %s: Failed to reach power state 0x%x (now: 0x%x)\n",  in apple_pmgr_ps_set()
80 			genpd->name, pstate, reg);  in apple_pmgr_ps_set()
83 		/* Not all devices implement this; this is a no-op where not implemented. */  in apple_pmgr_ps_set()
86 		regmap_write(ps->regmap, ps->offset, reg);  in apple_pmgr_ps_set()
96 	regmap_read(ps->regmap, ps->offset, &reg);  in apple_pmgr_ps_is_active()
98 	 * We consider domains as active if they are actually on, or if they have auto-PM  in apple_pmgr_ps_is_active()
120 	mutex_lock(&ps->genpd.mlock);  in apple_pmgr_reset_assert()
122 	if (ps->genpd.status == GENPD_STATE_OFF)  in apple_pmgr_reset_assert()
123 		dev_err(ps->dev, "PS 0x%x: asserting RESET while powered down\n", ps->offset);  in apple_pmgr_reset_assert()
125 	dev_dbg(ps->dev, "PS 0x%x: assert reset\n", ps->offset);  in apple_pmgr_reset_assert()
127 	regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE,  in apple_pmgr_reset_assert()
129 	regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_RESET,  in apple_pmgr_reset_assert()
132 	mutex_unlock(&ps->genpd.mlock);  in apple_pmgr_reset_assert()
141 	mutex_lock(&ps->genpd.mlock);  in apple_pmgr_reset_deassert()
143 	dev_dbg(ps->dev, "PS 0x%x: deassert reset\n", ps->offset);  in apple_pmgr_reset_deassert()
144 	regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_RESET, 0);  in apple_pmgr_reset_deassert()
145 	regmap_update_bits(ps->regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_DEV_DISABLE, 0);  in apple_pmgr_reset_deassert()
147 	if (ps->genpd.status == GENPD_STATE_OFF)  in apple_pmgr_reset_deassert()
148 		dev_err(ps->dev, "PS 0x%x: RESET was deasserted while powered down\n", ps->offset);  in apple_pmgr_reset_deassert()
150 	mutex_unlock(&ps->genpd.mlock);  in apple_pmgr_reset_deassert()
173 	regmap_read(ps->regmap, ps->offset, &reg);  in apple_pmgr_reset_status()
193 	struct device *dev = &pdev->dev;  in apple_pmgr_ps_probe()
194 	struct device_node *node = dev->of_node;  in apple_pmgr_ps_probe()
202 	regmap = syscon_node_to_regmap(node->parent);  in apple_pmgr_ps_probe()
208 		return -ENOMEM;  in apple_pmgr_ps_probe()
210 	ps->dev = dev;  in apple_pmgr_ps_probe()
211 	ps->regmap = regmap;  in apple_pmgr_ps_probe()
219 	ret = of_property_read_u32(node, "reg", &ps->offset);  in apple_pmgr_ps_probe()
225 	ps->genpd.name = name;  in apple_pmgr_ps_probe()
226 	ps->genpd.power_on = apple_pmgr_ps_power_on;  in apple_pmgr_ps_probe()
227 	ps->genpd.power_off = apple_pmgr_ps_power_off;  in apple_pmgr_ps_probe()
229 	ret = of_property_read_u32(node, "apple,min-state", &ps->min_state);  in apple_pmgr_ps_probe()
230 	if (ret == 0 && ps->min_state <= APPLE_PMGR_PS_ACTIVE)  in apple_pmgr_ps_probe()
231 		regmap_update_bits(regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_PS_MIN,  in apple_pmgr_ps_probe()
232 				   FIELD_PREP(APPLE_PMGR_PS_MIN, ps->min_state));  in apple_pmgr_ps_probe()
235 	if (of_property_read_bool(node, "apple,always-on")) {  in apple_pmgr_ps_probe()
236 		ps->genpd.flags |= GENPD_FLAG_ALWAYS_ON;  in apple_pmgr_ps_probe()
238 			dev_warn(dev, "always-on domain %s is not on at boot\n", name);  in apple_pmgr_ps_probe()
240 			active = apple_pmgr_ps_power_on(&ps->genpd) == 0;  in apple_pmgr_ps_probe()
244 	/* Turn on auto-PM if the domain is already on */  in apple_pmgr_ps_probe()
246 		regmap_update_bits(regmap, ps->offset, APPLE_PMGR_FLAGS | APPLE_PMGR_AUTO_ENABLE,  in apple_pmgr_ps_probe()
249 	ret = pm_genpd_init(&ps->genpd, NULL, !active);  in apple_pmgr_ps_probe()
255 	ret = of_genpd_add_provider_simple(node, &ps->genpd);  in apple_pmgr_ps_probe()
261 	of_for_each_phandle(&it, ret, node, "power-domains", "#power-domain-cells", -1) {  in apple_pmgr_ps_probe()
270 		if (ret == -EPROBE_DEFER) {  in apple_pmgr_ps_probe()
274 			dev_err(dev, "failed to add to parent domain: %d (%s -> %s)\n",  in apple_pmgr_ps_probe()
275 				ret, it.node->name, node->name);  in apple_pmgr_ps_probe()
287 	ps->rcdev.owner = THIS_MODULE;  in apple_pmgr_ps_probe()
288 	ps->rcdev.nr_resets = 1;  in apple_pmgr_ps_probe()
289 	ps->rcdev.ops = &apple_pmgr_reset_ops;  in apple_pmgr_ps_probe()
290 	ps->rcdev.of_node = dev->of_node;  in apple_pmgr_ps_probe()
291 	ps->rcdev.of_reset_n_cells = 0;  in apple_pmgr_ps_probe()
292 	ps->rcdev.of_xlate = apple_pmgr_reset_xlate;  in apple_pmgr_ps_probe()
294 	ret = devm_reset_controller_register(dev, &ps->rcdev);  in apple_pmgr_ps_probe()
301 	pm_genpd_remove(&ps->genpd);  in apple_pmgr_ps_probe()
306 	{ .compatible = "apple,pmgr-pwrstate" },
315 		.name = "apple-pmgr-pwrstate",
321 MODULE_DESCRIPTION("PMGR power state driver for Apple SoCs");