[linux-2.6-block.git] / drivers / soc / qcom / rpmhpd.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018, The Linux Foundation. All rights reserved.*/

#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/pm_domain.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <soc/qcom/cmd-db.h>
#include <soc/qcom/rpmh.h>
#include <dt-bindings/power/qcom-rpmpd.h>

#define domain_to_rpmhpd(domain) container_of(domain, struct rpmhpd, pd)

#define RPMH_ARC_MAX_LEVELS	16

/**
 * struct rpmhpd - top level RPMh power domain resource data structure
 * @dev:		rpmh power domain controller device
 * @pd:			generic_pm_domain corrresponding to the power domain
 * @peer:		A peer power domain in case Active only Voting is
 *			supported
 * @active_only:	True if it represents an Active only peer
 * @level:		An array of level (vlvl) to corner (hlvl) mappings
 *			derived from cmd-db
 * @level_count:	Number of levels supported by the power domain. max
 *			being 16 (0 - 15)
 * @enabled:		true if the power domain is enabled
 * @res_name:		Resource name used for cmd-db lookup
 * @addr:		Resource address as looped up using resource name from
 *			cmd-db
 */
struct rpmhpd {
	struct device	*dev;
	struct generic_pm_domain pd;
	struct generic_pm_domain *parent;
	struct rpmhpd	*peer;
	const bool	active_only;
	unsigned int	corner;
	unsigned int	active_corner;
	u32		level[RPMH_ARC_MAX_LEVELS];
	size_t		level_count;
	bool		enabled;
	const char	*res_name;
	u32		addr;
};

struct rpmhpd_desc {
	struct rpmhpd **rpmhpds;
	size_t num_pds;
};

static DEFINE_MUTEX(rpmhpd_lock);

/* SDM845 RPMH powerdomains */

static struct rpmhpd sdm845_ebi = {
	.pd = { .name = "ebi", },
	.res_name = "ebi.lvl",
};

static struct rpmhpd sdm845_lmx = {
	.pd = { .name = "lmx", },
	.res_name = "lmx.lvl",
};

static struct rpmhpd sdm845_lcx = {
	.pd = { .name = "lcx", },
	.res_name = "lcx.lvl",
};

static struct rpmhpd sdm845_gfx = {
	.pd = { .name = "gfx", },
	.res_name = "gfx.lvl",
};

static struct rpmhpd sdm845_mss = {
	.pd = { .name = "mss", },
	.res_name = "mss.lvl",
};

static struct rpmhpd sdm845_mx_ao;
static struct rpmhpd sdm845_mx = {
	.pd = { .name = "mx", },
	.peer = &sdm845_mx_ao,
	.res_name = "mx.lvl",
};

static struct rpmhpd sdm845_mx_ao = {
	.pd = { .name = "mx_ao", },
	.peer = &sdm845_mx,
	.res_name = "mx.lvl",
};

static struct rpmhpd sdm845_cx_ao;
static struct rpmhpd sdm845_cx = {
	.pd = { .name = "cx", },
	.peer = &sdm845_cx_ao,
	.parent = &sdm845_mx.pd,
	.res_name = "cx.lvl",
};

static struct rpmhpd sdm845_cx_ao = {
	.pd = { .name = "cx_ao", },
	.peer = &sdm845_cx,
	.parent = &sdm845_mx_ao.pd,
	.res_name = "cx.lvl",
};

static struct rpmhpd *sdm845_rpmhpds[] = {
	[SDM845_EBI] = &sdm845_ebi,
	[SDM845_MX] = &sdm845_mx,
	[SDM845_MX_AO] = &sdm845_mx_ao,
	[SDM845_CX] = &sdm845_cx,
	[SDM845_CX_AO] = &sdm845_cx_ao,
	[SDM845_LMX] = &sdm845_lmx,
	[SDM845_LCX] = &sdm845_lcx,
	[SDM845_GFX] = &sdm845_gfx,
	[SDM845_MSS] = &sdm845_mss,
};

static const struct rpmhpd_desc sdm845_desc = {
	.rpmhpds = sdm845_rpmhpds,
	.num_pds = ARRAY_SIZE(sdm845_rpmhpds),
};

/* SM8150 RPMH powerdomains */

static struct rpmhpd sm8150_mmcx_ao;
static struct rpmhpd sm8150_mmcx = {
	.pd = { .name = "mmcx", },
	.peer = &sm8150_mmcx_ao,
	.res_name = "mmcx.lvl",
};

static struct rpmhpd sm8150_mmcx_ao = {
	.pd = { .name = "mmcx_ao", },
	.active_only = true,
	.peer = &sm8150_mmcx,
	.res_name = "mmcx.lvl",
};

static struct rpmhpd *sm8150_rpmhpds[] = {
	[SM8150_MSS] = &sdm845_mss,
	[SM8150_EBI] = &sdm845_ebi,
	[SM8150_LMX] = &sdm845_lmx,
	[SM8150_LCX] = &sdm845_lcx,
	[SM8150_GFX] = &sdm845_gfx,
	[SM8150_MX] = &sdm845_mx,
	[SM8150_MX_AO] = &sdm845_mx_ao,
	[SM8150_CX] = &sdm845_cx,
	[SM8150_CX_AO] = &sdm845_cx_ao,
	[SM8150_MMCX] = &sm8150_mmcx,
	[SM8150_MMCX_AO] = &sm8150_mmcx_ao,
};

static const struct rpmhpd_desc sm8150_desc = {
	.rpmhpds = sm8150_rpmhpds,
	.num_pds = ARRAY_SIZE(sm8150_rpmhpds),
};

static const struct of_device_id rpmhpd_match_table[] = {
	{ .compatible = "qcom,sdm845-rpmhpd", .data = &sdm845_desc },
	{ .compatible = "qcom,sm8150-rpmhpd", .data = &sm8150_desc },
	{ }
};

static int rpmhpd_send_corner(struct rpmhpd *pd, int state,
			      unsigned int corner, bool sync)
{
	struct tcs_cmd cmd = {
		.addr = pd->addr,
		.data = corner,
	};

	/*
	 * Wait for an ack only when we are increasing the
	 * perf state of the power domain
	 */
	if (sync)
		return rpmh_write(pd->dev, state, &cmd, 1);
	else
		return rpmh_write_async(pd->dev, state, &cmd, 1);
}

static void to_active_sleep(struct rpmhpd *pd, unsigned int corner,
			    unsigned int *active, unsigned int *sleep)
{
	*active = corner;

	if (pd->active_only)
		*sleep = 0;
	else
		*sleep = *active;
}

/*
 * This function is used to aggregate the votes across the active only
 * resources and its peers. The aggregated votes are sent to RPMh as
 * ACTIVE_ONLY votes (which take effect immediately), as WAKE_ONLY votes
 * (applied by RPMh on system wakeup) and as SLEEP votes (applied by RPMh
 * on system sleep).
 * We send ACTIVE_ONLY votes for resources without any peers. For others,
 * which have an active only peer, all 3 votes are sent.
 */
static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
{
	int ret;
	struct rpmhpd *peer = pd->peer;
	unsigned int active_corner, sleep_corner;
	unsigned int this_active_corner = 0, this_sleep_corner = 0;
	unsigned int peer_active_corner = 0, peer_sleep_corner = 0;

	to_active_sleep(pd, corner, &this_active_corner, &this_sleep_corner);

	if (peer && peer->enabled)
		to_active_sleep(peer, peer->corner, &peer_active_corner,
				&peer_sleep_corner);

	active_corner = max(this_active_corner, peer_active_corner);

	ret = rpmhpd_send_corner(pd, RPMH_ACTIVE_ONLY_STATE, active_corner,
				 active_corner > pd->active_corner);
	if (ret)
		return ret;

	pd->active_corner = active_corner;

	if (peer) {
		peer->active_corner = active_corner;

		ret = rpmhpd_send_corner(pd, RPMH_WAKE_ONLY_STATE,
					 active_corner, false);
		if (ret)
			return ret;

		sleep_corner = max(this_sleep_corner, peer_sleep_corner);

		return rpmhpd_send_corner(pd, RPMH_SLEEP_STATE, sleep_corner,
					  false);
	}

	return ret;
}

static int rpmhpd_power_on(struct generic_pm_domain *domain)
{
	struct rpmhpd *pd = domain_to_rpmhpd(domain);
	int ret = 0;

	mutex_lock(&rpmhpd_lock);

	if (pd->corner)
		ret = rpmhpd_aggregate_corner(pd, pd->corner);

	if (!ret)
		pd->enabled = true;

	mutex_unlock(&rpmhpd_lock);

	return ret;
}

static int rpmhpd_power_off(struct generic_pm_domain *domain)
{
	struct rpmhpd *pd = domain_to_rpmhpd(domain);
	int ret = 0;

	mutex_lock(&rpmhpd_lock);

	ret = rpmhpd_aggregate_corner(pd, pd->level[0]);

	if (!ret)
		pd->enabled = false;

	mutex_unlock(&rpmhpd_lock);

	return ret;
}

static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
					unsigned int level)
{
	struct rpmhpd *pd = domain_to_rpmhpd(domain);
	int ret = 0, i;

	mutex_lock(&rpmhpd_lock);

	for (i = 0; i < pd->level_count; i++)
		if (level <= pd->level[i])
			break;

	/*
	 * If the level requested is more than that supported by the
	 * max corner, just set it to max anyway.
	 */
	if (i == pd->level_count)
		i--;

	if (pd->enabled) {
		ret = rpmhpd_aggregate_corner(pd, i);
		if (ret)
			goto out;
	}

	pd->corner = i;
out:
	mutex_unlock(&rpmhpd_lock);

	return ret;
}

static unsigned int rpmhpd_get_performance_state(struct generic_pm_domain *genpd,
						 struct dev_pm_opp *opp)
{
	return dev_pm_opp_get_level(opp);
}

static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
{
	int i;
	const u16 *buf;

	buf = cmd_db_read_aux_data(rpmhpd->res_name, &rpmhpd->level_count);
	if (IS_ERR(buf))
		return PTR_ERR(buf);

	/* 2 bytes used for each command DB aux data entry */
	rpmhpd->level_count >>= 1;

	if (rpmhpd->level_count > RPMH_ARC_MAX_LEVELS)
		return -EINVAL;

	for (i = 0; i < rpmhpd->level_count; i++) {
		rpmhpd->level[i] = buf[i];

		/*
		 * The AUX data may be zero padded.  These 0 valued entries at
		 * the end of the map must be ignored.
		 */
		if (i > 0 && rpmhpd->level[i] == 0) {
			rpmhpd->level_count = i;
			break;
		}
		pr_debug("%s: ARC hlvl=%2d --> vlvl=%4u\n", rpmhpd->res_name, i,
			 rpmhpd->level[i]);
	}

	return 0;
}

static int rpmhpd_probe(struct platform_device *pdev)
{
	int i, ret;
	size_t num_pds;
	struct device *dev = &pdev->dev;
	struct genpd_onecell_data *data;
	struct rpmhpd **rpmhpds;
	const struct rpmhpd_desc *desc;

	desc = of_device_get_match_data(dev);
	if (!desc)
		return -EINVAL;

	rpmhpds = desc->rpmhpds;
	num_pds = desc->num_pds;

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

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

	data->num_domains = num_pds;

	for (i = 0; i < num_pds; i++) {
		if (!rpmhpds[i]) {
			dev_warn(dev, "rpmhpds[%d] is empty\n", i);
			continue;
		}

		rpmhpds[i]->dev = dev;
		rpmhpds[i]->addr = cmd_db_read_addr(rpmhpds[i]->res_name);
		if (!rpmhpds[i]->addr) {
			dev_err(dev, "Could not find RPMh address for resource %s\n",
				rpmhpds[i]->res_name);
			return -ENODEV;
		}

		ret = cmd_db_read_slave_id(rpmhpds[i]->res_name);
		if (ret != CMD_DB_HW_ARC) {
			dev_err(dev, "RPMh slave ID mismatch\n");
			return -EINVAL;
		}

		ret = rpmhpd_update_level_mapping(rpmhpds[i]);
		if (ret)
			return ret;

		rpmhpds[i]->pd.power_off = rpmhpd_power_off;
		rpmhpds[i]->pd.power_on = rpmhpd_power_on;
		rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance_state;
		rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance_state;
		pm_genpd_init(&rpmhpds[i]->pd, NULL, true);

		data->domains[i] = &rpmhpds[i]->pd;
	}

	/* Add subdomains */
	for (i = 0; i < num_pds; i++) {
		if (!rpmhpds[i])
			continue;
		if (rpmhpds[i]->parent)
			pm_genpd_add_subdomain(rpmhpds[i]->parent,
					       &rpmhpds[i]->pd);
	}

	return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
}

static struct platform_driver rpmhpd_driver = {
	.driver = {
		.name = "qcom-rpmhpd",
		.of_match_table = rpmhpd_match_table,
		.suppress_bind_attrs = true,
	},
	.probe = rpmhpd_probe,
};

static int __init rpmhpd_init(void)
{
	return platform_driver_register(&rpmhpd_driver);
}
core_initcall(rpmhpd_init);
Commit	Line	Data
279b7e8a RN	1	// SPDX-License-Identifier: GPL-2.0
	2	/* Copyright (c) 2018, The Linux Foundation. All rights reserved.*/
	3
	4	#include <linux/err.h>
	5	#include <linux/init.h>
	6	#include <linux/kernel.h>
	7	#include <linux/mutex.h>
	8	#include <linux/pm_domain.h>
	9	#include <linux/slab.h>
	10	#include <linux/of.h>
	11	#include <linux/of_device.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/pm_opp.h>
	14	#include <soc/qcom/cmd-db.h>
	15	#include <soc/qcom/rpmh.h>
	16	#include <dt-bindings/power/qcom-rpmpd.h>
	17
	18	#define domain_to_rpmhpd(domain) container_of(domain, struct rpmhpd, pd)
	19
	20	#define RPMH_ARC_MAX_LEVELS 16
	21
	22	/**
	23	* struct rpmhpd - top level RPMh power domain resource data structure
	24	* @dev: rpmh power domain controller device
	25	* @pd: generic_pm_domain corrresponding to the power domain
	26	* @peer: A peer power domain in case Active only Voting is
	27	* supported
	28	* @active_only: True if it represents an Active only peer
	29	* @level: An array of level (vlvl) to corner (hlvl) mappings
	30	* derived from cmd-db
	31	* @level_count: Number of levels supported by the power domain. max
	32	* being 16 (0 - 15)
	33	* @enabled: true if the power domain is enabled
	34	* @res_name: Resource name used for cmd-db lookup
	35	* @addr: Resource address as looped up using resource name from
	36	* cmd-db
	37	*/
	38	struct rpmhpd {
	39	struct device *dev;
	40	struct generic_pm_domain pd;
	41	struct generic_pm_domain *parent;
	42	struct rpmhpd *peer;
	43	const bool active_only;
	44	unsigned int corner;
	45	unsigned int active_corner;
	46	u32 level[RPMH_ARC_MAX_LEVELS];
	47	size_t level_count;
	48	bool enabled;
	49	const char *res_name;
	50	u32 addr;
	51	};
	52
	53	struct rpmhpd_desc {
	54	struct rpmhpd **rpmhpds;
	55	size_t num_pds;
	56	};
	57
	58	static DEFINE_MUTEX(rpmhpd_lock);
	59
	60	/* SDM845 RPMH powerdomains */
	61
	62	static struct rpmhpd sdm845_ebi = {
	63	.pd = { .name = "ebi", },
	64	.res_name = "ebi.lvl",
65	};
66
67	static struct rpmhpd sdm845_lmx = {
68	.pd = { .name = "lmx", },
69	.res_name = "lmx.lvl",
70	};
71
72	static struct rpmhpd sdm845_lcx = {
73	.pd = { .name = "lcx", },
74	.res_name = "lcx.lvl",
75	};
76
77	static struct rpmhpd sdm845_gfx = {
78	.pd = { .name = "gfx", },
79	.res_name = "gfx.lvl",
80	};
81
82	static struct rpmhpd sdm845_mss = {
83	.pd = { .name = "mss", },
84	.res_name = "mss.lvl",
85	};
86
87	static struct rpmhpd sdm845_mx_ao;
88	static struct rpmhpd sdm845_mx = {
89	.pd = { .name = "mx", },
90	.peer = &sdm845_mx_ao,
91	.res_name = "mx.lvl",
92	};
93
94	static struct rpmhpd sdm845_mx_ao = {
95	.pd = { .name = "mx_ao", },
96	.peer = &sdm845_mx,
97	.res_name = "mx.lvl",
98	};
99
100	static struct rpmhpd sdm845_cx_ao;
101	static struct rpmhpd sdm845_cx = {
102	.pd = { .name = "cx", },
103	.peer = &sdm845_cx_ao,
0503aec2	104	.parent = &sdm845_mx.pd,
279b7e8a RN	105	.res_name = "cx.lvl",
	106	};
	107
	108	static struct rpmhpd sdm845_cx_ao = {
	109	.pd = { .name = "cx_ao", },
	110	.peer = &sdm845_cx,
0503aec2	111	.parent = &sdm845_mx_ao.pd,
279b7e8a RN	112	.res_name = "cx.lvl",
	113	};
	114
	115	static struct rpmhpd *sdm845_rpmhpds[] = {
	116	[SDM845_EBI] = &sdm845_ebi,
	117	[SDM845_MX] = &sdm845_mx,
	118	[SDM845_MX_AO] = &sdm845_mx_ao,
	119	[SDM845_CX] = &sdm845_cx,
	120	[SDM845_CX_AO] = &sdm845_cx_ao,
	121	[SDM845_LMX] = &sdm845_lmx,
	122	[SDM845_LCX] = &sdm845_lcx,
	123	[SDM845_GFX] = &sdm845_gfx,
	124	[SDM845_MSS] = &sdm845_mss,
	125	};
	126
	127	static const struct rpmhpd_desc sdm845_desc = {
	128	.rpmhpds = sdm845_rpmhpds,
	129	.num_pds = ARRAY_SIZE(sdm845_rpmhpds),
	130	};
	131
4e6a2011 SS	132	/* SM8150 RPMH powerdomains */
	133
	134	static struct rpmhpd sm8150_mmcx_ao;
	135	static struct rpmhpd sm8150_mmcx = {
	136	.pd = { .name = "mmcx", },
	137	.peer = &sm8150_mmcx_ao,
	138	.res_name = "mmcx.lvl",
	139	};
	140
	141	static struct rpmhpd sm8150_mmcx_ao = {
	142	.pd = { .name = "mmcx_ao", },
	143	.active_only = true,
	144	.peer = &sm8150_mmcx,
	145	.res_name = "mmcx.lvl",
	146	};
	147
	148	static struct rpmhpd *sm8150_rpmhpds[] = {
	149	[SM8150_MSS] = &sdm845_mss,
	150	[SM8150_EBI] = &sdm845_ebi,
	151	[SM8150_LMX] = &sdm845_lmx,
	152	[SM8150_LCX] = &sdm845_lcx,
	153	[SM8150_GFX] = &sdm845_gfx,
	154	[SM8150_MX] = &sdm845_mx,
	155	[SM8150_MX_AO] = &sdm845_mx_ao,
	156	[SM8150_CX] = &sdm845_cx,
	157	[SM8150_CX_AO] = &sdm845_cx_ao,
	158	[SM8150_MMCX] = &sm8150_mmcx,
	159	[SM8150_MMCX_AO] = &sm8150_mmcx_ao,
	160	};
	161
	162	static const struct rpmhpd_desc sm8150_desc = {
	163	.rpmhpds = sm8150_rpmhpds,
	164	.num_pds = ARRAY_SIZE(sm8150_rpmhpds),
	165	};
	166
279b7e8a RN	167	static const struct of_device_id rpmhpd_match_table[] = {
279b7e8a RN	168	{ .compatible = "qcom,sdm845-rpmhpd", .data = &sdm845_desc },
4e6a2011	169	{ .compatible = "qcom,sm8150-rpmhpd", .data = &sm8150_desc },
279b7e8a RN	170	{ }
	171	};
	172
	173	static int rpmhpd_send_corner(struct rpmhpd *pd, int state,
	174	unsigned int corner, bool sync)
	175	{
	176	struct tcs_cmd cmd = {
	177	.addr = pd->addr,
	178	.data = corner,
	179	};
	180
	181	/*
	182	* Wait for an ack only when we are increasing the
	183	* perf state of the power domain
	184	*/
	185	if (sync)
	186	return rpmh_write(pd->dev, state, &cmd, 1);
	187	else
	188	return rpmh_write_async(pd->dev, state, &cmd, 1);
	189	}
	190
	191	static void to_active_sleep(struct rpmhpd *pd, unsigned int corner,
	192	unsigned int active, unsigned int sleep)
	193	{
	194	*active = corner;
	195
	196	if (pd->active_only)
	197	*sleep = 0;
	198	else
	199	sleep = active;
	200	}
	201
	202	/*
	203	* This function is used to aggregate the votes across the active only
	204	* resources and its peers. The aggregated votes are sent to RPMh as
	205	* ACTIVE_ONLY votes (which take effect immediately), as WAKE_ONLY votes
	206	* (applied by RPMh on system wakeup) and as SLEEP votes (applied by RPMh
	207	* on system sleep).
	208	* We send ACTIVE_ONLY votes for resources without any peers. For others,
	209	* which have an active only peer, all 3 votes are sent.
	210	*/
	211	static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
	212	{
	213	int ret;
	214	struct rpmhpd *peer = pd->peer;
	215	unsigned int active_corner, sleep_corner;
	216	unsigned int this_active_corner = 0, this_sleep_corner = 0;
	217	unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
	218
	219	to_active_sleep(pd, corner, &this_active_corner, &this_sleep_corner);
	220
	221	if (peer && peer->enabled)
	222	to_active_sleep(peer, peer->corner, &peer_active_corner,
	223	&peer_sleep_corner);
	224
	225	active_corner = max(this_active_corner, peer_active_corner);
	226
	227	ret = rpmhpd_send_corner(pd, RPMH_ACTIVE_ONLY_STATE, active_corner,
	228	active_corner > pd->active_corner);
	229	if (ret)
	230	return ret;
	231
	232	pd->active_corner = active_corner;
	233
234	if (peer) {
235	peer->active_corner = active_corner;
236
237	ret = rpmhpd_send_corner(pd, RPMH_WAKE_ONLY_STATE,
238	active_corner, false);
239	if (ret)
240	return ret;
241
242	sleep_corner = max(this_sleep_corner, peer_sleep_corner);
243
244	return rpmhpd_send_corner(pd, RPMH_SLEEP_STATE, sleep_corner,
245	false);
246	}
247
248	return ret;
249	}
250
251	static int rpmhpd_power_on(struct generic_pm_domain *domain)
252	{
253	struct rpmhpd *pd = domain_to_rpmhpd(domain);
254	int ret = 0;
255
256	mutex_lock(&rpmhpd_lock);
257
258	if (pd->corner)
259	ret = rpmhpd_aggregate_corner(pd, pd->corner);
260
261	if (!ret)
262	pd->enabled = true;
263
264	mutex_unlock(&rpmhpd_lock);
265
266	return ret;
267	}
268
269	static int rpmhpd_power_off(struct generic_pm_domain *domain)
270	{
271	struct rpmhpd *pd = domain_to_rpmhpd(domain);
272	int ret = 0;
273
274	mutex_lock(&rpmhpd_lock);
275
276	ret = rpmhpd_aggregate_corner(pd, pd->level[0]);
277
278	if (!ret)
279	pd->enabled = false;
280
281	mutex_unlock(&rpmhpd_lock);
282
283	return ret;
284	}
285
286	static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
287	unsigned int level)
288	{
289	struct rpmhpd *pd = domain_to_rpmhpd(domain);
290	int ret = 0, i;
291
292	mutex_lock(&rpmhpd_lock);
293
294	for (i = 0; i < pd->level_count; i++)
295	if (level <= pd->level[i])
296	break;
297
298	/*
299	* If the level requested is more than that supported by the
300	* max corner, just set it to max anyway.
301	*/
302	if (i == pd->level_count)
303	i--;
304
305	if (pd->enabled) {
306	ret = rpmhpd_aggregate_corner(pd, i);
307	if (ret)
308	goto out;
309	}
310
311	pd->corner = i;
312	out:
313	mutex_unlock(&rpmhpd_lock);
314
315	return ret;
316	}
317
318	static unsigned int rpmhpd_get_performance_state(struct generic_pm_domain *genpd,
319	struct dev_pm_opp *opp)
320	{
321	return dev_pm_opp_get_level(opp);
322	}
323
324	static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
325	{
326	int i;
327	const u16 *buf;
328
329	buf = cmd_db_read_aux_data(rpmhpd->res_name, &rpmhpd->level_count);
330	if (IS_ERR(buf))
331	return PTR_ERR(buf);
332
333	/* 2 bytes used for each command DB aux data entry */
334	rpmhpd->level_count >>= 1;
335
336	if (rpmhpd->level_count > RPMH_ARC_MAX_LEVELS)
337	return -EINVAL;
338
339	for (i = 0; i < rpmhpd->level_count; i++) {
340	rpmhpd->level[i] = buf[i];
341
342	/*
343	* The AUX data may be zero padded. These 0 valued entries at
344	* the end of the map must be ignored.
345	*/
346	if (i > 0 && rpmhpd->level[i] == 0) {
347	rpmhpd->level_count = i;
348	break;
349	}
350	pr_debug("%s: ARC hlvl=%2d --> vlvl=%4u\n", rpmhpd->res_name, i,
351	rpmhpd->level[i]);
352	}
353
354	return 0;
355	}
356
357	static int rpmhpd_probe(struct platform_device *pdev)
358	{
359	int i, ret;
360	size_t num_pds;
361	struct device *dev = &pdev->dev;
362	struct genpd_onecell_data *data;
363	struct rpmhpd **rpmhpds;
364	const struct rpmhpd_desc *desc;
365
366	desc = of_device_get_match_data(dev);
367	if (!desc)
368	return -EINVAL;
369
370	rpmhpds = desc->rpmhpds;
371	num_pds = desc->num_pds;
372
373	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
374	if (!data)
375	return -ENOMEM;
376
377	data->domains = devm_kcalloc(dev, num_pds, sizeof(*data->domains),
378	GFP_KERNEL);
379	if (!data->domains)
380	return -ENOMEM;
381
382	data->num_domains = num_pds;
383
384	for (i = 0; i < num_pds; i++) {
385	if (!rpmhpds[i]) {
386	dev_warn(dev, "rpmhpds[%d] is empty\n", i);
387	continue;
388	}
389
390	rpmhpds[i]->dev = dev;
391	rpmhpds[i]->addr = cmd_db_read_addr(rpmhpds[i]->res_name);
392	if (!rpmhpds[i]->addr) {
393	dev_err(dev, "Could not find RPMh address for resource %s\n",
394	rpmhpds[i]->res_name);
395	return -ENODEV;
396	}
397
398	ret = cmd_db_read_slave_id(rpmhpds[i]->res_name);
399	if (ret != CMD_DB_HW_ARC) {
400	dev_err(dev, "RPMh slave ID mismatch\n");
401	return -EINVAL;
402	}
403
404	ret = rpmhpd_update_level_mapping(rpmhpds[i]);
405	if (ret)
406	return ret;
407
408	rpmhpds[i]->pd.power_off = rpmhpd_power_off;
409	rpmhpds[i]->pd.power_on = rpmhpd_power_on;
410	rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance_state;
411	rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance_state;
412	pm_genpd_init(&rpmhpds[i]->pd, NULL, true);
413
414	data->domains[i] = &rpmhpds[i]->pd;
415	}
416
0503aec2 RN	417	/* Add subdomains */
	418	for (i = 0; i < num_pds; i++) {
	419	if (!rpmhpds[i])
	420	continue;
	421	if (rpmhpds[i]->parent)
	422	pm_genpd_add_subdomain(rpmhpds[i]->parent,
	423	&rpmhpds[i]->pd);
	424	}
	425
279b7e8a RN	426	return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
	427	}
	428
	429	static struct platform_driver rpmhpd_driver = {
	430	.driver = {
	431	.name = "qcom-rpmhpd",
	432	.of_match_table = rpmhpd_match_table,
	433	.suppress_bind_attrs = true,
	434	},
	435	.probe = rpmhpd_probe,
	436	};
	437
	438	static int __init rpmhpd_init(void)
	439	{
	440	return platform_driver_register(&rpmhpd_driver);
	441	}
	442	core_initcall(rpmhpd_init);