1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (c) 2015, 2017-2018, The Linux Foundation. All rights reserved.
16 #include <linux/reset-controller.h>
60 	if (sc->flags & POLL_CFG_GDSCR)  in gdsc_check_status()
61 		reg = sc->gdscr + CFG_GDSCR_OFFSET;  in gdsc_check_status()
62 	else if (sc->gds_hw_ctrl)  in gdsc_check_status()
63 		reg = sc->gds_hw_ctrl;  in gdsc_check_status()
65 		reg = sc->gdscr;  in gdsc_check_status()
67 	ret = regmap_read(sc->regmap, reg, &val);  in gdsc_check_status()
71 	if (sc->flags & POLL_CFG_GDSCR) {  in gdsc_check_status()
87 	return -EINVAL;  in gdsc_check_status()
94 	return regmap_update_bits(sc->regmap, sc->gdscr, HW_CONTROL_MASK, val);  in gdsc_hwctrl()
110 	return -ETIMEDOUT;  in gdsc_poll_status()
118 	if (status == GDSC_ON && sc->rsupply) {  in gdsc_toggle_logic()
119 		ret = regulator_enable(sc->rsupply);  in gdsc_toggle_logic()
124 	ret = regmap_update_bits(sc->regmap, sc->gdscr, SW_COLLAPSE_MASK, val);  in gdsc_toggle_logic()
129 	if ((sc->flags & VOTABLE) && status == GDSC_OFF) {  in gdsc_toggle_logic()
139 	if (sc->gds_hw_ctrl) {  in gdsc_toggle_logic()
141 		 * The gds hw controller asserts/de-asserts the status bit soon  in gdsc_toggle_logic()
154 	WARN(ret, "%s status stuck at 'o%s'", sc->pd.name, status ? "ff" : "n");  in gdsc_toggle_logic()
156 	if (!ret && status == GDSC_OFF && sc->rsupply) {  in gdsc_toggle_logic()
157 		ret = regulator_disable(sc->rsupply);  in gdsc_toggle_logic()
169 	for (i = 0; i < sc->reset_count; i++)  in gdsc_deassert_reset()
170 		sc->rcdev->ops->deassert(sc->rcdev, sc->resets[i]);  in gdsc_deassert_reset()
178 	for (i = 0; i < sc->reset_count; i++)  in gdsc_assert_reset()
179 		sc->rcdev->ops->assert(sc->rcdev, sc->resets[i]);  in gdsc_assert_reset()
188 	for (i = 0; i < sc->cxc_count; i++)  in gdsc_force_mem_on()
189 		regmap_update_bits(sc->regmap, sc->cxcs[i], mask, mask);  in gdsc_force_mem_on()
197 	for (i = 0; i < sc->cxc_count; i++)  in gdsc_clear_mem_on()
198 		regmap_update_bits(sc->regmap, sc->cxcs[i], mask, 0);  in gdsc_clear_mem_on()
203 	regmap_update_bits(sc->regmap, sc->clamp_io_ctrl,  in gdsc_deassert_clamp_io()
209 	regmap_update_bits(sc->regmap, sc->clamp_io_ctrl,  in gdsc_assert_clamp_io()
215 	regmap_update_bits(sc->regmap, sc->clamp_io_ctrl,  in gdsc_assert_reset_aon()
218 	regmap_update_bits(sc->regmap, sc->clamp_io_ctrl,  in gdsc_assert_reset_aon()
226 	regmap_update_bits(sc->regmap, sc->gdscr, mask, mask);  in gdsc_retain_ff_on()
234 	if (sc->pwrsts == PWRSTS_ON)  in gdsc_enable()
237 	if (sc->flags & SW_RESET) {  in gdsc_enable()
243 	if (sc->flags & CLAMP_IO) {  in gdsc_enable()
244 		if (sc->flags & AON_RESET)  in gdsc_enable()
253 	if (sc->pwrsts & PWRSTS_OFF)  in gdsc_enable()
258 	 * additional 4 clock cycles to re-enable after the power domain is  in gdsc_enable()
266 	if (sc->flags & HW_CTRL) {  in gdsc_enable()
281 	if (sc->flags & RETAIN_FF_ENABLE)  in gdsc_enable()
292 	if (sc->pwrsts == PWRSTS_ON)  in gdsc_disable()
296 	if (sc->flags & HW_CTRL) {  in gdsc_disable()
313 	if (sc->pwrsts & PWRSTS_OFF)  in gdsc_disable()
320 	if (sc->flags & CLAMP_IO)  in gdsc_disable()
333 	 * Disable SW override: Use hardware state-machine for sequencing.  in gdsc_init()
339 	ret = regmap_update_bits(sc->regmap, sc->gdscr, mask, val);  in gdsc_init()
344 	if (sc->pwrsts == PWRSTS_ON) {  in gdsc_init()
358 	if ((sc->flags & VOTABLE) && on)  in gdsc_init()
359 		gdsc_enable(&sc->pd);  in gdsc_init()
366 	if ((sc->flags & RETAIN_FF_ENABLE) && on)  in gdsc_init()
370 	if (sc->flags & ALWAYS_ON) {  in gdsc_init()
372 			gdsc_enable(&sc->pd);  in gdsc_init()
374 		sc->pd.flags |= GENPD_FLAG_ALWAYS_ON;  in gdsc_init()
377 	if (on || (sc->pwrsts & PWRSTS_RET))  in gdsc_init()
382 	if (!sc->pd.power_off)  in gdsc_init()
383 		sc->pd.power_off = gdsc_disable;  in gdsc_init()
384 	if (!sc->pd.power_on)  in gdsc_init()
385 		sc->pd.power_on = gdsc_enable;  in gdsc_init()
386 	pm_genpd_init(&sc->pd, NULL, !on);  in gdsc_init()
396 	struct device *dev = desc->dev;  in gdsc_register()
397 	struct gdsc **scs = desc->scs;  in gdsc_register()
398 	size_t num = desc->num;  in gdsc_register()
402 		return -ENOMEM;  in gdsc_register()
404 	data->domains = devm_kcalloc(dev, num, sizeof(*data->domains),  in gdsc_register()
406 	if (!data->domains)  in gdsc_register()
407 		return -ENOMEM;  in gdsc_register()
410 		if (!scs[i] || !scs[i]->supply)  in gdsc_register()
413 		scs[i]->rsupply = devm_regulator_get(dev, scs[i]->supply);  in gdsc_register()
414 		if (IS_ERR(scs[i]->rsupply))  in gdsc_register()
415 			return PTR_ERR(scs[i]->rsupply);  in gdsc_register()
418 	data->num_domains = num;  in gdsc_register()
422 		scs[i]->regmap = regmap;  in gdsc_register()
423 		scs[i]->rcdev = rcdev;  in gdsc_register()
427 		data->domains[i] = &scs[i]->pd;  in gdsc_register()
434 		if (scs[i]->parent)  in gdsc_register()
435 			pm_genpd_add_subdomain(scs[i]->parent, &scs[i]->pd);  in gdsc_register()
438 	return of_genpd_add_provider_onecell(dev->of_node, data);  in gdsc_register()
444 	struct device *dev = desc->dev;  in gdsc_unregister()
445 	struct gdsc **scs = desc->scs;  in gdsc_unregister()
446 	size_t num = desc->num;  in gdsc_unregister()
452 		if (scs[i]->parent)  in gdsc_unregister()
453 			pm_genpd_remove_subdomain(scs[i]->parent, &scs[i]->pd);  in gdsc_unregister()
455 	of_genpd_del_provider(dev->of_node);  in gdsc_unregister()
466  * way to reach in and touch that register from deep inside the GPU driver we
475  * is *really* off - this gives us a semi standard way of doing what we need.