1 // SPDX-License-Identifier: GPL-2.0
3  * R-Car SYSC Power management support
6  * Copyright (C) 2015-2017 Glider bvba
18 #include <linux/soc/renesas/rcar-sysc.h>
20 #include "rcar-sysc.h"
36  *	 Use WFI to power off, CPG/APMU to resume ARM cores on R-Car Gen2
37  *	 Use PSCI on R-Car Gen3
56 #define RCAR_PD_ALWAYS_ON	32	/* Always-on power area */
89 		return -EAGAIN;  in rcar_sysc_pwr_on_off()
92 	iowrite32(BIT(sysc_ch->chan_bit),  in rcar_sysc_pwr_on_off()
93 		  rcar_sysc_base + sysc_ch->chan_offs + reg_offs);  in rcar_sysc_pwr_on_off()
100 	unsigned int isr_mask = BIT(sysc_ch->isr_bit);  in rcar_sysc_power()
101 	unsigned int chan_mask = BIT(sysc_ch->chan_bit);  in rcar_sysc_power()
135 				  sysc_ch->chan_offs + PWRER_OFFS);  in rcar_sysc_power()
143 		ret = -EIO;  in rcar_sysc_power()
155 		ret = -EIO;  in rcar_sysc_power()
165 	pr_debug("sysc power %s domain %d: %08x -> %d\n", on ? "on" : "off",  in rcar_sysc_power()
166 		 sysc_ch->isr_bit, ioread32(rcar_sysc_base + SYSCISR), ret);  in rcar_sysc_power()
174 	st = ioread32(rcar_sysc_base + sysc_ch->chan_offs + PWRSR_OFFS);  in rcar_sysc_power_is_off()
175 	if (st & BIT(sysc_ch->chan_bit))  in rcar_sysc_power_is_off()
197 	pr_debug("%s: %s\n", __func__, genpd->name);  in rcar_sysc_pd_power_off()
198 	return rcar_sysc_power(&pd->ch, false);  in rcar_sysc_pd_power_off()
205 	pr_debug("%s: %s\n", __func__, genpd->name);  in rcar_sysc_pd_power_on()
206 	return rcar_sysc_power(&pd->ch, true);  in rcar_sysc_pd_power_on()
213 	struct generic_pm_domain *genpd = &pd->genpd;  in rcar_sysc_pd_setup()
214 	const char *name = pd->genpd.name;  in rcar_sysc_pd_setup()
217 	if (pd->flags & PD_CPU) {  in rcar_sysc_pd_setup()
223 		genpd->flags |= GENPD_FLAG_ALWAYS_ON;  in rcar_sysc_pd_setup()
224 	} else if (pd->flags & PD_SCU) {  in rcar_sysc_pd_setup()
226 		 * This domain contains an SCU and cache-controller, and  in rcar_sysc_pd_setup()
231 		genpd->flags |= GENPD_FLAG_ALWAYS_ON;  in rcar_sysc_pd_setup()
232 	} else if (pd->flags & PD_NO_CR) {  in rcar_sysc_pd_setup()
236 		genpd->flags |= GENPD_FLAG_ALWAYS_ON;  in rcar_sysc_pd_setup()
239 	if (!(pd->flags & (PD_CPU | PD_SCU))) {  in rcar_sysc_pd_setup()
241 		genpd->flags |= GENPD_FLAG_PM_CLK | GENPD_FLAG_ACTIVE_WAKEUP;  in rcar_sysc_pd_setup()
243 			genpd->attach_dev = cpg_mstp_attach_dev;  in rcar_sysc_pd_setup()
244 			genpd->detach_dev = cpg_mstp_detach_dev;  in rcar_sysc_pd_setup()
246 			genpd->attach_dev = cpg_mssr_attach_dev;  in rcar_sysc_pd_setup()
247 			genpd->detach_dev = cpg_mssr_detach_dev;  in rcar_sysc_pd_setup()
251 	genpd->power_off = rcar_sysc_pd_power_off;  in rcar_sysc_pd_setup()
252 	genpd->power_on = rcar_sysc_pd_power_on;  in rcar_sysc_pd_setup()
254 	if (pd->flags & (PD_CPU | PD_NO_CR)) {  in rcar_sysc_pd_setup()
256 		pr_debug("%s: Not touching %s\n", __func__, genpd->name);  in rcar_sysc_pd_setup()
260 	if (!rcar_sysc_power_is_off(&pd->ch)) {  in rcar_sysc_pd_setup()
261 		pr_debug("%s: %s is already powered\n", __func__, genpd->name);  in rcar_sysc_pd_setup()
265 	rcar_sysc_power(&pd->ch, true);  in rcar_sysc_pd_setup()
277 	{ .compatible = "renesas,r8a7742-sysc", .data = &r8a7742_sysc_info },
280 	{ .compatible = "renesas,r8a7743-sysc", .data = &r8a7743_sysc_info },
282 	{ .compatible = "renesas,r8a7744-sysc", .data = &r8a7743_sysc_info },
285 	{ .compatible = "renesas,r8a7745-sysc", .data = &r8a7745_sysc_info },
288 	{ .compatible = "renesas,r8a77470-sysc", .data = &r8a77470_sysc_info },
291 	{ .compatible = "renesas,r8a774a1-sysc", .data = &r8a774a1_sysc_info },
294 	{ .compatible = "renesas,r8a774b1-sysc", .data = &r8a774b1_sysc_info },
297 	{ .compatible = "renesas,r8a774c0-sysc", .data = &r8a774c0_sysc_info },
300 	{ .compatible = "renesas,r8a774e1-sysc", .data = &r8a774e1_sysc_info },
303 	{ .compatible = "renesas,r8a7779-sysc", .data = &r8a7779_sysc_info },
306 	{ .compatible = "renesas,r8a7790-sysc", .data = &r8a7790_sysc_info },
309 	{ .compatible = "renesas,r8a7791-sysc", .data = &r8a7791_sysc_info },
310 	/* R-Car M2-N is identical to R-Car M2-W w.r.t. power domains. */
311 	{ .compatible = "renesas,r8a7793-sysc", .data = &r8a7791_sysc_info },
314 	{ .compatible = "renesas,r8a7792-sysc", .data = &r8a7792_sysc_info },
317 	{ .compatible = "renesas,r8a7794-sysc", .data = &r8a7794_sysc_info },
320 	{ .compatible = "renesas,r8a7795-sysc", .data = &r8a7795_sysc_info },
323 	{ .compatible = "renesas,r8a7796-sysc", .data = &r8a77960_sysc_info },
326 	{ .compatible = "renesas,r8a77961-sysc", .data = &r8a77961_sysc_info },
329 	{ .compatible = "renesas,r8a77965-sysc", .data = &r8a77965_sysc_info },
332 	{ .compatible = "renesas,r8a77970-sysc", .data = &r8a77970_sysc_info },
335 	{ .compatible = "renesas,r8a77980-sysc", .data = &r8a77980_sysc_info },
338 	{ .compatible = "renesas,r8a77990-sysc", .data = &r8a77990_sysc_info },
341 	{ .compatible = "renesas,r8a77995-sysc", .data = &r8a77995_sysc_info },
365 		return -ENODEV;  in rcar_sysc_pd_init()
367 	info = match->data;  in rcar_sysc_pd_init()
369 	if (info->init) {  in rcar_sysc_pd_init()
370 		error = info->init();  in rcar_sysc_pd_init()
376 					       "renesas,cpg-mstp-clocks");  in rcar_sysc_pd_init()
381 		error = -ENOMEM;  in rcar_sysc_pd_init()
388 	rcar_sysc_extmask_offs = info->extmask_offs;  in rcar_sysc_pd_init()
389 	rcar_sysc_extmask_val = info->extmask_val;  in rcar_sysc_pd_init()
393 		error = -ENOMEM;  in rcar_sysc_pd_init()
397 	domains->onecell_data.domains = domains->domains;  in rcar_sysc_pd_init()
398 	domains->onecell_data.num_domains = ARRAY_SIZE(domains->domains);  in rcar_sysc_pd_init()
399 	rcar_sysc_onecell_data = &domains->onecell_data;  in rcar_sysc_pd_init()
401 	for (i = 0; i < info->num_areas; i++) {  in rcar_sysc_pd_init()
402 		const struct rcar_sysc_area *area = &info->areas[i];  in rcar_sysc_pd_init()
405 		if (!area->name) {  in rcar_sysc_pd_init()
410 		pd = kzalloc(sizeof(*pd) + strlen(area->name) + 1, GFP_KERNEL);  in rcar_sysc_pd_init()
412 			error = -ENOMEM;  in rcar_sysc_pd_init()
416 		strcpy(pd->name, area->name);  in rcar_sysc_pd_init()
417 		pd->genpd.name = pd->name;  in rcar_sysc_pd_init()
418 		pd->ch.chan_offs = area->chan_offs;  in rcar_sysc_pd_init()
419 		pd->ch.chan_bit = area->chan_bit;  in rcar_sysc_pd_init()
420 		pd->ch.isr_bit = area->isr_bit;  in rcar_sysc_pd_init()
421 		pd->flags = area->flags;  in rcar_sysc_pd_init()
427 		domains->domains[area->isr_bit] = &pd->genpd;  in rcar_sysc_pd_init()
429 		if (area->parent < 0)  in rcar_sysc_pd_init()
432 		error = pm_genpd_add_subdomain(domains->domains[area->parent],  in rcar_sysc_pd_init()
433 					       &pd->genpd);  in rcar_sysc_pd_init()
436 				area->name, area->parent);  in rcar_sysc_pd_init()
441 	error = of_genpd_add_provider_onecell(np, &domains->onecell_data);  in rcar_sysc_pd_init()
469 		return -ENODEV;  in rcar_sysc_power_cpu()
471 	for (i = 0; i < rcar_sysc_onecell_data->num_domains; i++) {  in rcar_sysc_power_cpu()
472 		genpd = rcar_sysc_onecell_data->domains[i];  in rcar_sysc_power_cpu()
477 		if (!(pd->flags & PD_CPU) || pd->ch.chan_bit != idx)  in rcar_sysc_power_cpu()
480 		return rcar_sysc_power(&pd->ch, on);  in rcar_sysc_power_cpu()
483 	return -ENOENT;  in rcar_sysc_power_cpu()