[linux-block.git] / drivers / firmware / arm_scmi / scmi_pm_domain.c

// SPDX-License-Identifier: GPL-2.0
/*
 * SCMI Generic power domain support.
 *
 * Copyright (C) 2018-2021 ARM Ltd.
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pm_clock.h>
#include <linux/pm_domain.h>
#include <linux/scmi_protocol.h>

static const struct scmi_power_proto_ops *power_ops;

struct scmi_pm_domain {
	struct generic_pm_domain genpd;
	const struct scmi_protocol_handle *ph;
	const char *name;
	u32 domain;
};

#define to_scmi_pd(gpd) container_of(gpd, struct scmi_pm_domain, genpd)

static int scmi_pd_power(struct generic_pm_domain *domain, bool power_on)
{
	int ret;
	u32 state, ret_state;
	struct scmi_pm_domain *pd = to_scmi_pd(domain);

	if (power_on)
		state = SCMI_POWER_STATE_GENERIC_ON;
	else
		state = SCMI_POWER_STATE_GENERIC_OFF;

	ret = power_ops->state_set(pd->ph, pd->domain, state);
	if (!ret)
		ret = power_ops->state_get(pd->ph, pd->domain, &ret_state);
	if (!ret && state != ret_state)
		return -EIO;

	return ret;
}

static int scmi_pd_power_on(struct generic_pm_domain *domain)
{
	return scmi_pd_power(domain, true);
}

static int scmi_pd_power_off(struct generic_pm_domain *domain)
{
	return scmi_pd_power(domain, false);
}

static int scmi_pd_attach_dev(struct generic_pm_domain *pd, struct device *dev)
{
	int ret;

	ret = pm_clk_create(dev);
	if (ret)
		return ret;

	ret = of_pm_clk_add_clks(dev);
	if (ret >= 0)
		return 0;

	pm_clk_destroy(dev);
	return ret;
}

static void scmi_pd_detach_dev(struct generic_pm_domain *pd, struct device *dev)
{
	pm_clk_destroy(dev);
}

static int scmi_pm_domain_probe(struct scmi_device *sdev)
{
	int num_domains, i;
	struct device *dev = &sdev->dev;
	struct device_node *np = dev->of_node;
	struct scmi_pm_domain *scmi_pd;
	struct genpd_onecell_data *scmi_pd_data;
	struct generic_pm_domain **domains;
	const struct scmi_handle *handle = sdev->handle;
	struct scmi_protocol_handle *ph;

	if (!handle)
		return -ENODEV;

	power_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_POWER, &ph);
	if (IS_ERR(power_ops))
		return PTR_ERR(power_ops);

	num_domains = power_ops->num_domains_get(ph);
	if (num_domains < 0) {
		dev_err(dev, "number of domains not found\n");
		return num_domains;
	}

	scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL);
	if (!scmi_pd)
		return -ENOMEM;

	scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL);
	if (!scmi_pd_data)
		return -ENOMEM;

	domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL);
	if (!domains)
		return -ENOMEM;

	for (i = 0; i < num_domains; i++, scmi_pd++) {
		u32 state;

		if (power_ops->state_get(ph, i, &state)) {
			dev_warn(dev, "failed to get state for domain %d\n", i);
			continue;
		}

		scmi_pd->domain = i;
		scmi_pd->ph = ph;
		scmi_pd->name = power_ops->name_get(ph, i);
		scmi_pd->genpd.name = scmi_pd->name;
		scmi_pd->genpd.power_off = scmi_pd_power_off;
		scmi_pd->genpd.power_on = scmi_pd_power_on;
		scmi_pd->genpd.attach_dev = scmi_pd_attach_dev;
		scmi_pd->genpd.detach_dev = scmi_pd_detach_dev;
		scmi_pd->genpd.flags = GENPD_FLAG_PM_CLK |
				       GENPD_FLAG_ACTIVE_WAKEUP;

		pm_genpd_init(&scmi_pd->genpd, NULL,
			      state == SCMI_POWER_STATE_GENERIC_OFF);

		domains[i] = &scmi_pd->genpd;
	}

	scmi_pd_data->domains = domains;
	scmi_pd_data->num_domains = num_domains;

	return of_genpd_add_provider_onecell(np, scmi_pd_data);
}

static const struct scmi_device_id scmi_id_table[] = {
	{ SCMI_PROTOCOL_POWER, "genpd" },
	{ },
};
MODULE_DEVICE_TABLE(scmi, scmi_id_table);

static struct scmi_driver scmi_power_domain_driver = {
	.name = "scmi-power-domain",
	.probe = scmi_pm_domain_probe,
	.id_table = scmi_id_table,
};
module_scmi_driver(scmi_power_domain_driver);

MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
MODULE_DESCRIPTION("ARM SCMI power domain driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
898216c9 SH	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* SCMI Generic power domain support.
	4	*
26f19496	5	* Copyright (C) 2018-2021 ARM Ltd.
898216c9 SH	6	*/
	7
	8	#include <linux/err.h>
	9	#include <linux/io.h>
	10	#include <linux/module.h>
a3b884ce	11	#include <linux/pm_clock.h>
898216c9 SH	12	#include <linux/pm_domain.h>
	13	#include <linux/scmi_protocol.h>
	14
26f19496 CM	15	static const struct scmi_power_proto_ops *power_ops;
26f19496 CM	16
898216c9 SH	17	struct scmi_pm_domain {
898216c9 SH	18	struct generic_pm_domain genpd;
26f19496	19	const struct scmi_protocol_handle *ph;
898216c9 SH	20	const char *name;
	21	u32 domain;
	22	};
	23
	24	#define to_scmi_pd(gpd) container_of(gpd, struct scmi_pm_domain, genpd)
	25
	26	static int scmi_pd_power(struct generic_pm_domain *domain, bool power_on)
	27	{
	28	int ret;
	29	u32 state, ret_state;
	30	struct scmi_pm_domain *pd = to_scmi_pd(domain);
898216c9 SH	31
	32	if (power_on)
	33	state = SCMI_POWER_STATE_GENERIC_ON;
	34	else
	35	state = SCMI_POWER_STATE_GENERIC_OFF;
	36
26f19496	37	ret = power_ops->state_set(pd->ph, pd->domain, state);
898216c9	38	if (!ret)
26f19496	39	ret = power_ops->state_get(pd->ph, pd->domain, &ret_state);
898216c9 SH	40	if (!ret && state != ret_state)
	41	return -EIO;
	42
	43	return ret;
	44	}
	45
	46	static int scmi_pd_power_on(struct generic_pm_domain *domain)
	47	{
	48	return scmi_pd_power(domain, true);
	49	}
	50
	51	static int scmi_pd_power_off(struct generic_pm_domain *domain)
	52	{
	53	return scmi_pd_power(domain, false);
	54	}
	55
a3b884ce NP	56	static int scmi_pd_attach_dev(struct generic_pm_domain pd, struct device dev)
	57	{
	58	int ret;
	59
	60	ret = pm_clk_create(dev);
	61	if (ret)
	62	return ret;
	63
	64	ret = of_pm_clk_add_clks(dev);
	65	if (ret >= 0)
	66	return 0;
	67
	68	pm_clk_destroy(dev);
	69	return ret;
	70	}
	71
	72	static void scmi_pd_detach_dev(struct generic_pm_domain pd, struct device dev)
	73	{
	74	pm_clk_destroy(dev);
	75	}
	76
898216c9 SH	77	static int scmi_pm_domain_probe(struct scmi_device *sdev)
	78	{
	79	int num_domains, i;
	80	struct device *dev = &sdev->dev;
	81	struct device_node *np = dev->of_node;
	82	struct scmi_pm_domain *scmi_pd;
	83	struct genpd_onecell_data *scmi_pd_data;
	84	struct generic_pm_domain **domains;
	85	const struct scmi_handle *handle = sdev->handle;
26f19496	86	struct scmi_protocol_handle *ph;
898216c9	87
26f19496	88	if (!handle)
898216c9 SH	89	return -ENODEV;
898216c9 SH	90
26f19496 CM	91	power_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_POWER, &ph);
	92	if (IS_ERR(power_ops))
	93	return PTR_ERR(power_ops);
	94
	95	num_domains = power_ops->num_domains_get(ph);
898216c9 SH	96	if (num_domains < 0) {
	97	dev_err(dev, "number of domains not found\n");
	98	return num_domains;
	99	}
	100
	101	scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL);
	102	if (!scmi_pd)
	103	return -ENOMEM;
	104
	105	scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL);
	106	if (!scmi_pd_data)
	107	return -ENOMEM;
	108
	109	domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL);
	110	if (!domains)
	111	return -ENOMEM;
	112
	113	for (i = 0; i < num_domains; i++, scmi_pd++) {
	114	u32 state;
	115
26f19496	116	if (power_ops->state_get(ph, i, &state)) {
e0f1a30c CM	117	dev_warn(dev, "failed to get state for domain %d\n", i);
	118	continue;
	119	}
898216c9 SH	120
898216c9 SH	121	scmi_pd->domain = i;
26f19496 CM	122	scmi_pd->ph = ph;
26f19496 CM	123	scmi_pd->name = power_ops->name_get(ph, i);
898216c9 SH	124	scmi_pd->genpd.name = scmi_pd->name;
	125	scmi_pd->genpd.power_off = scmi_pd_power_off;
	126	scmi_pd->genpd.power_on = scmi_pd_power_on;
a3b884ce NP	127	scmi_pd->genpd.attach_dev = scmi_pd_attach_dev;
	128	scmi_pd->genpd.detach_dev = scmi_pd_detach_dev;
	129	scmi_pd->genpd.flags = GENPD_FLAG_PM_CLK \|
	130	GENPD_FLAG_ACTIVE_WAKEUP;
898216c9	131
898216c9 SH	132	pm_genpd_init(&scmi_pd->genpd, NULL,
898216c9 SH	133	state == SCMI_POWER_STATE_GENERIC_OFF);
e0f1a30c CM	134
e0f1a30c CM	135	domains[i] = &scmi_pd->genpd;
898216c9 SH	136	}
	137
	138	scmi_pd_data->domains = domains;
	139	scmi_pd_data->num_domains = num_domains;
	140
1446fc6c	141	return of_genpd_add_provider_onecell(np, scmi_pd_data);
898216c9 SH	142	}
	143
	144	static const struct scmi_device_id scmi_id_table[] = {
50872a94	145	{ SCMI_PROTOCOL_POWER, "genpd" },
898216c9 SH	146	{ },
	147	};
	148	MODULE_DEVICE_TABLE(scmi, scmi_id_table);
	149
	150	static struct scmi_driver scmi_power_domain_driver = {
	151	.name = "scmi-power-domain",
	152	.probe = scmi_pm_domain_probe,
	153	.id_table = scmi_id_table,
	154	};
	155	module_scmi_driver(scmi_power_domain_driver);
	156
	157	MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
	158	MODULE_DESCRIPTION("ARM SCMI power domain driver");
	159	MODULE_LICENSE("GPL v2");