1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
6  *	Tero Kristo <t-kristo@ti.com>
20 #include <linux/reset-controller.h>
23 #include <linux/platform_data/ti-prm.h>
34 	unsigned long statechange:1;	/* Optional low-power state change */
140 	{ .rst = -1 },
146 	{ .rst = -1 },
153 	{ .rst = -1 },
248 		.rstctrl = 0x210, .rstst = 0x214, .clkdm_name = "ipu",
303 		.name = "ipu", .base = 0x4ae06500,
395 	{ .rst = -1 },
400 	{ .rst = -1 },
443 	{ .rst = -1 },
449 	{ .rst = -1 },
495 	{ .compatible = "ti,omap4-prm-inst", .data = omap4_prm_data },
496 	{ .compatible = "ti,omap5-prm-inst", .data = omap5_prm_data },
497 	{ .compatible = "ti,dra7-prm-inst", .data = dra7_prm_data },
498 	{ .compatible = "ti,am3-prm-inst", .data = am3_prm_data },
499 	{ .compatible = "ti,am4-prm-inst", .data = am4_prm_data },
507 	dev_dbg(prmd->dev, "%s %s: %08x/%08x\n",  in omap_prm_domain_show_state()
508 		prmd->pd.name, desc,  in omap_prm_domain_show_state()
509 		readl_relaxed(prmd->prm->base + prmd->pwrstctrl),  in omap_prm_domain_show_state()
510 		readl_relaxed(prmd->prm->base + prmd->pwrstst));  in omap_prm_domain_show_state()
526 	if (!prmd->cap)  in omap_prm_domain_power_on()
531 	if (prmd->pwrstctrl_saved)  in omap_prm_domain_power_on()
532 		v = prmd->pwrstctrl_saved;  in omap_prm_domain_power_on()
534 		v = readl_relaxed(prmd->prm->base + prmd->pwrstctrl);  in omap_prm_domain_power_on()
536 	if (prmd->prm->data->flags & OMAP_PRM_RET_WHEN_IDLE)  in omap_prm_domain_power_on()
542 		       prmd->prm->base + prmd->pwrstctrl);  in omap_prm_domain_power_on()
545 	ret = readl_relaxed_poll_timeout(prmd->prm->base + prmd->pwrstst,  in omap_prm_domain_power_on()
549 		dev_err(prmd->dev, "%s: %s timed out\n",  in omap_prm_domain_power_on()
550 			prmd->pd.name, __func__);  in omap_prm_domain_power_on()
560 	return __ffs(prmd->cap->usable_modes);  in omap_prm_domain_find_lowest()
570 	if (!prmd->cap)  in omap_prm_domain_power_off()
575 	v = readl_relaxed(prmd->prm->base + prmd->pwrstctrl);  in omap_prm_domain_power_off()
576 	prmd->pwrstctrl_saved = v;  in omap_prm_domain_power_off()
581 	if (prmd->cap->statechange)  in omap_prm_domain_power_off()
583 	if (prmd->cap->logicretstate)  in omap_prm_domain_power_off()
588 	writel_relaxed(v, prmd->prm->base + prmd->pwrstctrl);  in omap_prm_domain_power_off()
591 	ret = readl_relaxed_poll_timeout(prmd->prm->base + prmd->pwrstst,  in omap_prm_domain_power_off()
595 		dev_warn(prmd->dev, "%s: %s timed out\n",  in omap_prm_domain_power_off()
596 			 __func__, prmd->pd.name);  in omap_prm_domain_power_off()
604  * Note that ti-sysc already manages the module clocks separately so
606  * for simple-pm-bus.
611 	struct device_node *np = dev->of_node;  in omap_prm_domain_attach_clock()
614 	if (!of_device_is_compatible(np, "simple-pm-bus"))  in omap_prm_domain_attach_clock()
630 	prmd->uses_pm_clk = 1;  in omap_prm_domain_attach_clock()
645 	np = dev->of_node;  in omap_prm_domain_attach_dev()
647 	ret = of_parse_phandle_with_args(np, "power-domains",  in omap_prm_domain_attach_dev()
648 					 "#power-domain-cells", 0, &pd_args);  in omap_prm_domain_attach_dev()
653 		dev_warn(dev, "%s: unusupported #power-domain-cells: %i\n",  in omap_prm_domain_attach_dev()
654 			 prmd->pd.name, pd_args.args_count);  in omap_prm_domain_attach_dev()
657 	genpd_data->data = NULL;  in omap_prm_domain_attach_dev()
673 	if (prmd->uses_pm_clk)  in omap_prm_domain_detach_dev()
676 	genpd_data->data = NULL;  in omap_prm_domain_detach_dev()
682 	struct device_node *np = dev->of_node;  in omap_prm_domain_init()
687 	if (!of_find_property(dev->of_node, "#power-domain-cells", NULL))  in omap_prm_domain_init()
690 	of_node_put(dev->of_node);  in omap_prm_domain_init()
694 		return -ENOMEM;  in omap_prm_domain_init()
696 	data = prm->data;  in omap_prm_domain_init()
698 			      data->name);  in omap_prm_domain_init()
700 	prmd->dev = dev;  in omap_prm_domain_init()
701 	prmd->prm = prm;  in omap_prm_domain_init()
702 	prmd->cap = prmd->prm->data->dmap;  in omap_prm_domain_init()
703 	prmd->pwrstctrl = prmd->prm->data->pwrstctrl;  in omap_prm_domain_init()
704 	prmd->pwrstst = prmd->prm->data->pwrstst;  in omap_prm_domain_init()
706 	prmd->pd.name = name;  in omap_prm_domain_init()
707 	prmd->pd.power_on = omap_prm_domain_power_on;  in omap_prm_domain_init()
708 	prmd->pd.power_off = omap_prm_domain_power_off;  in omap_prm_domain_init()
709 	prmd->pd.attach_dev = omap_prm_domain_attach_dev;  in omap_prm_domain_init()
710 	prmd->pd.detach_dev = omap_prm_domain_detach_dev;  in omap_prm_domain_init()
711 	prmd->pd.flags = GENPD_FLAG_PM_CLK;  in omap_prm_domain_init()
713 	pm_genpd_init(&prmd->pd, NULL, true);  in omap_prm_domain_init()
714 	error = of_genpd_add_provider_simple(np, &prmd->pd);  in omap_prm_domain_init()
716 		pm_genpd_remove(&prmd->pd);  in omap_prm_domain_init()
718 		prm->prmd = prmd;  in omap_prm_domain_init()
725 	if (reset->mask & BIT(id))  in _is_valid_reset()
734 	const struct omap_rst_map *map = reset->prm->data->rstmap;  in omap_reset_get_st_bit()
736 	while (map->rst >= 0) {  in omap_reset_get_st_bit()
737 		if (map->rst == id)  in omap_reset_get_st_bit()
738 			return map->st;  in omap_reset_get_st_bit()
752 	bool has_rstst = reset->prm->data->rstst ||  in omap_reset_status()
753 		(reset->prm->data->flags & OMAP_PRM_HAS_RSTST);  in omap_reset_status()
757 		return -ENOTSUPP;  in omap_reset_status()
760 	v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);  in omap_reset_status()
768 	v = readl_relaxed(reset->prm->base + reset->prm->data->rstst);  in omap_reset_status()
783 	spin_lock_irqsave(&reset->lock, flags);  in omap_reset_assert()
784 	v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);  in omap_reset_assert()
786 	writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);  in omap_reset_assert()
787 	spin_unlock_irqrestore(&reset->lock, flags);  in omap_reset_assert()
800 	struct ti_prm_platform_data *pdata = dev_get_platdata(reset->dev);  in omap_reset_deassert()
807 	has_rstst = reset->prm->data->rstst ||  in omap_reset_deassert()
808 		(reset->prm->data->flags & OMAP_PRM_HAS_RSTST);  in omap_reset_deassert()
815 		writel_relaxed(v, reset->prm->base + reset->prm->data->rstst);  in omap_reset_deassert()
818 	if (reset->clkdm)  in omap_reset_deassert()
819 		pdata->clkdm_deny_idle(reset->clkdm);  in omap_reset_deassert()
821 	/* de-assert the reset control line */  in omap_reset_deassert()
822 	spin_lock_irqsave(&reset->lock, flags);  in omap_reset_deassert()
823 	v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);  in omap_reset_deassert()
825 	writel_relaxed(v, reset->prm->base + reset->prm->data->rstctrl);  in omap_reset_deassert()
826 	spin_unlock_irqrestore(&reset->lock, flags);  in omap_reset_deassert()
829 	ret = readl_relaxed_poll_timeout_atomic(reset->prm->base +  in omap_reset_deassert()
830 						reset->prm->data->rstctrl,  in omap_reset_deassert()
835 		       reset->prm->data->name, id);  in omap_reset_deassert()
839 		ret = readl_relaxed_poll_timeout_atomic(reset->prm->base +  in omap_reset_deassert()
840 						 reset->prm->data->rstst,  in omap_reset_deassert()
845 			       reset->prm->data->name, id);  in omap_reset_deassert()
848 	if (reset->clkdm)  in omap_reset_deassert()
849 		pdata->clkdm_allow_idle(reset->clkdm);  in omap_reset_deassert()
865 	if (!_is_valid_reset(reset, reset_spec->args[0]))  in omap_prm_reset_xlate()
866 		return -EINVAL;  in omap_prm_reset_xlate()
868 	return reset_spec->args[0];  in omap_prm_reset_xlate()
876 	struct ti_prm_platform_data *pdata = dev_get_platdata(&pdev->dev);  in omap_prm_reset_init()
881 	 * Check if we have controllable resets. If either rstctrl is non-zero  in omap_prm_reset_init()
885 	if (!prm->data->rstctrl && !(prm->data->flags & OMAP_PRM_HAS_RSTCTRL))  in omap_prm_reset_init()
889 	if (!pdata || !pdata->clkdm_lookup || !pdata->clkdm_deny_idle ||  in omap_prm_reset_init()
890 	    !pdata->clkdm_allow_idle)  in omap_prm_reset_init()
891 		return -EINVAL;  in omap_prm_reset_init()
893 	map = prm->data->rstmap;  in omap_prm_reset_init()
895 		return -EINVAL;  in omap_prm_reset_init()
897 	reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);  in omap_prm_reset_init()
899 		return -ENOMEM;  in omap_prm_reset_init()
901 	reset->rcdev.owner = THIS_MODULE;  in omap_prm_reset_init()
902 	reset->rcdev.ops = &omap_reset_ops;  in omap_prm_reset_init()
903 	reset->rcdev.of_node = pdev->dev.of_node;  in omap_prm_reset_init()
904 	reset->rcdev.nr_resets = OMAP_MAX_RESETS;  in omap_prm_reset_init()
905 	reset->rcdev.of_xlate = omap_prm_reset_xlate;  in omap_prm_reset_init()
906 	reset->rcdev.of_reset_n_cells = 1;  in omap_prm_reset_init()
907 	reset->dev = &pdev->dev;  in omap_prm_reset_init()
908 	spin_lock_init(&reset->lock);  in omap_prm_reset_init()
910 	reset->prm = prm;  in omap_prm_reset_init()
912 	sprintf(buf, "%s_clkdm", prm->data->clkdm_name ? prm->data->clkdm_name :  in omap_prm_reset_init()
913 		prm->data->name);  in omap_prm_reset_init()
915 	if (!(prm->data->flags & OMAP_PRM_HAS_NO_CLKDM)) {  in omap_prm_reset_init()
916 		reset->clkdm = pdata->clkdm_lookup(buf);  in omap_prm_reset_init()
917 		if (!reset->clkdm)  in omap_prm_reset_init()
918 			return -EINVAL;  in omap_prm_reset_init()
921 	while (map->rst >= 0) {  in omap_prm_reset_init()
922 		reset->mask |= BIT(map->rst);  in omap_prm_reset_init()
927 	if (prm->data->rstmap == rst_map_012) {  in omap_prm_reset_init()
928 		v = readl_relaxed(reset->prm->base + reset->prm->data->rstctrl);  in omap_prm_reset_init()
929 		if ((v & reset->mask) != reset->mask) {  in omap_prm_reset_init()
930 			dev_dbg(&pdev->dev, "Asserting all resets: %08x\n", v);  in omap_prm_reset_init()
931 			writel_relaxed(reset->mask, reset->prm->base +  in omap_prm_reset_init()
932 				       reset->prm->data->rstctrl);  in omap_prm_reset_init()
936 	return devm_reset_controller_register(&pdev->dev, &reset->rcdev);  in omap_prm_reset_init()
948 		return -ENODEV;  in omap_prm_probe()
950 	data = of_device_get_match_data(&pdev->dev);  in omap_prm_probe()
952 		return -ENOTSUPP;  in omap_prm_probe()
954 	prm = devm_kzalloc(&pdev->dev, sizeof(*prm), GFP_KERNEL);  in omap_prm_probe()
956 		return -ENOMEM;  in omap_prm_probe()
958 	while (data->base != res->start) {  in omap_prm_probe()
959 		if (!data->base)  in omap_prm_probe()
960 			return -EINVAL;  in omap_prm_probe()
964 	prm->data = data;  in omap_prm_probe()
966 	prm->base = devm_ioremap_resource(&pdev->dev, res);  in omap_prm_probe()
967 	if (IS_ERR(prm->base))  in omap_prm_probe()
968 		return PTR_ERR(prm->base);  in omap_prm_probe()
970 	ret = omap_prm_domain_init(&pdev->dev, prm);  in omap_prm_probe()
981 	of_genpd_del_provider(pdev->dev.of_node);  in omap_prm_probe()
982 	pm_genpd_remove(&prm->prmd->pd);  in omap_prm_probe()