1 // SPDX-License-Identifier: GPL-2.0
3  * R-Car Gen4 SYSC Power management support
12 #include <linux/io.h>
22 #include "rcar-gen4-sysc.h"
26 #define SYSCPONSR(x)	(0x800 + ((x) * 0x4)) /* Power-ON Status Register 0 */
27 #define SYSCPOFFSR(x)	(0x808 + ((x) * 0x4)) /* Power-OFF Status Register */
39 #define PWRON_PWROFF		BIT(0)	/* Power-ON/OFF request */
45 #define PDRSR_OFF		BIT(0)	/* Power-OFF state */
46 #define PDRSR_ON		BIT(4)	/* Power-ON state */
47 #define PDRSR_OFF_STATE		BIT(8)  /* Processing Power-OFF sequence */
48 #define PDRSR_ON_STATE		BIT(12) /* Processing Power-ON sequence */
83 		return -EAGAIN;  in rcar_gen4_sysc_pwr_on_off()
103 		return -EIO;  in clear_irq_flags()
153 		ret = -EIO;  in rcar_gen4_sysc_power()
162 		ret = -EIO;  in rcar_gen4_sysc_power()
174 	pr_debug("sysc power %s domain %d: %08x -> %d\n", on ? "on" : "off",  in rcar_gen4_sysc_power()
207 	pr_debug("%s: %s\n", __func__, genpd->name);  in rcar_gen4_sysc_pd_power_off()
208 	return rcar_gen4_sysc_power(pd->pdr, false);  in rcar_gen4_sysc_pd_power_off()
215 	pr_debug("%s: %s\n", __func__, genpd->name);  in rcar_gen4_sysc_pd_power_on()
216 	return rcar_gen4_sysc_power(pd->pdr, true);  in rcar_gen4_sysc_pd_power_on()
221 	struct generic_pm_domain *genpd = &pd->genpd;  in rcar_gen4_sysc_pd_setup()
222 	const char *name = pd->genpd.name;  in rcar_gen4_sysc_pd_setup()
225 	if (pd->flags & PD_CPU) {  in rcar_gen4_sysc_pd_setup()
231 		genpd->flags |= GENPD_FLAG_ALWAYS_ON;  in rcar_gen4_sysc_pd_setup()
232 	} else if (pd->flags & PD_SCU) {  in rcar_gen4_sysc_pd_setup()
234 		 * This domain contains an SCU and cache-controller, and  in rcar_gen4_sysc_pd_setup()
239 		genpd->flags |= GENPD_FLAG_ALWAYS_ON;  in rcar_gen4_sysc_pd_setup()
240 	} else if (pd->flags & PD_NO_CR) {  in rcar_gen4_sysc_pd_setup()
244 		genpd->flags |= GENPD_FLAG_ALWAYS_ON;  in rcar_gen4_sysc_pd_setup()
247 	if (!(pd->flags & (PD_CPU | PD_SCU))) {  in rcar_gen4_sysc_pd_setup()
249 		genpd->flags |= GENPD_FLAG_PM_CLK | GENPD_FLAG_ACTIVE_WAKEUP;  in rcar_gen4_sysc_pd_setup()
250 		genpd->attach_dev = cpg_mssr_attach_dev;  in rcar_gen4_sysc_pd_setup()
251 		genpd->detach_dev = cpg_mssr_detach_dev;  in rcar_gen4_sysc_pd_setup()
254 	genpd->power_off = rcar_gen4_sysc_pd_power_off;  in rcar_gen4_sysc_pd_setup()
255 	genpd->power_on = rcar_gen4_sysc_pd_power_on;  in rcar_gen4_sysc_pd_setup()
257 	if (pd->flags & (PD_CPU | PD_NO_CR)) {  in rcar_gen4_sysc_pd_setup()
259 		pr_debug("%s: Not touching %s\n", __func__, genpd->name);  in rcar_gen4_sysc_pd_setup()
263 	if (!rcar_gen4_sysc_power_is_off(pd->pdr)) {  in rcar_gen4_sysc_pd_setup()
264 		pr_debug("%s: %s is already powered\n", __func__, genpd->name);  in rcar_gen4_sysc_pd_setup()
268 	rcar_gen4_sysc_power(pd->pdr, true);  in rcar_gen4_sysc_pd_setup()
280 	{ .compatible = "renesas,r8a779a0-sysc", .data = &r8a779a0_sysc_info },
283 	{ .compatible = "renesas,r8a779f0-sysc", .data = &r8a779f0_sysc_info },
286 	{ .compatible = "renesas,r8a779g0-sysc", .data = &r8a779g0_sysc_info },
293 	struct generic_pm_domain *domains[RCAR_GEN4_PD_ALWAYS_ON + 1];  member
302 	struct rcar_gen4_pm_domains *domains;  in rcar_gen4_sysc_pd_init()  local
310 		return -ENODEV;  in rcar_gen4_sysc_pd_init()
312 	info = match->data;  in rcar_gen4_sysc_pd_init()
317 		error = -ENOMEM;  in rcar_gen4_sysc_pd_init()
323 	domains = kzalloc(sizeof(*domains), GFP_KERNEL);  in rcar_gen4_sysc_pd_init()
324 	if (!domains) {  in rcar_gen4_sysc_pd_init()
325 		error = -ENOMEM;  in rcar_gen4_sysc_pd_init()
329 	domains->onecell_data.domains = domains->domains;  in rcar_gen4_sysc_pd_init()
330 	domains->onecell_data.num_domains = ARRAY_SIZE(domains->domains);  in rcar_gen4_sysc_pd_init()
331 	rcar_gen4_sysc_onecell_data = &domains->onecell_data;  in rcar_gen4_sysc_pd_init()
333 	for (i = 0; i < info->num_areas; i++) {  in rcar_gen4_sysc_pd_init()
334 		const struct rcar_gen4_sysc_area *area = &info->areas[i];  in rcar_gen4_sysc_pd_init()
338 		if (!area->name) {  in rcar_gen4_sysc_pd_init()
343 		n = strlen(area->name) + 1;  in rcar_gen4_sysc_pd_init()
346 			error = -ENOMEM;  in rcar_gen4_sysc_pd_init()
350 		memcpy(pd->name, area->name, n);  in rcar_gen4_sysc_pd_init()
351 		pd->genpd.name = pd->name;  in rcar_gen4_sysc_pd_init()
352 		pd->pdr = area->pdr;  in rcar_gen4_sysc_pd_init()
353 		pd->flags = area->flags;  in rcar_gen4_sysc_pd_init()
359 		domains->domains[area->pdr] = &pd->genpd;  in rcar_gen4_sysc_pd_init()
361 		if (area->parent < 0)  in rcar_gen4_sysc_pd_init()
364 		error = pm_genpd_add_subdomain(domains->domains[area->parent],  in rcar_gen4_sysc_pd_init()
365 					       &pd->genpd);  in rcar_gen4_sysc_pd_init()
368 				area->name, area->parent);  in rcar_gen4_sysc_pd_init()
373 	error = of_genpd_add_provider_onecell(np, &domains->onecell_data);  in rcar_gen4_sysc_pd_init()