summaryrefslogtreecommitdiff
path: root/drivers/pmdomain/ti/ti_sci_pm_domains.c
blob: c091d569ecd5f3d05d84a261f1756f549ddb37e2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
// SPDX-License-Identifier: GPL-2.0-only
/*
 * TI SCI Generic Power Domain Driver
 *
 * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
 *	J Keerthy <j-keerthy@ti.com>
 *	Dave Gerlach <d-gerlach@ti.com>
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/slab.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <dt-bindings/soc/ti,sci_pm_domain.h>

/**
 * struct ti_sci_genpd_provider: holds common TI SCI genpd provider data
 * @ti_sci: handle to TI SCI protocol driver that provides ops to
 *	    communicate with system control processor.
 * @dev: pointer to dev for the driver for devm allocs
 * @pd_list: list of all the power domains on the device
 * @data: onecell data for genpd core
 */
struct ti_sci_genpd_provider {
	const struct ti_sci_handle *ti_sci;
	struct device *dev;
	struct list_head pd_list;
	struct genpd_onecell_data data;
};

/**
 * struct ti_sci_pm_domain: TI specific data needed for power domain
 * @idx: index of the device that identifies it with the system
 *	 control processor.
 * @exclusive: Permissions for exclusive request or shared request of the
 *	       device.
 * @pd: generic_pm_domain for use with the genpd framework
 * @node: link for the genpd list
 * @parent: link to the parent TI SCI genpd provider
 */
struct ti_sci_pm_domain {
	int idx;
	u8 exclusive;
	struct generic_pm_domain pd;
	struct list_head node;
	struct ti_sci_genpd_provider *parent;
};

#define genpd_to_ti_sci_pd(gpd) container_of(gpd, struct ti_sci_pm_domain, pd)

/*
 * ti_sci_pd_power_off(): genpd power down hook
 * @domain: pointer to the powerdomain to power off
 */
static int ti_sci_pd_power_off(struct generic_pm_domain *domain)
{
	struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain);
	const struct ti_sci_handle *ti_sci = pd->parent->ti_sci;

	return ti_sci->ops.dev_ops.put_device(ti_sci, pd->idx);
}

/*
 * ti_sci_pd_power_on(): genpd power up hook
 * @domain: pointer to the powerdomain to power on
 */
static int ti_sci_pd_power_on(struct generic_pm_domain *domain)
{
	struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain);
	const struct ti_sci_handle *ti_sci = pd->parent->ti_sci;

	if (pd->exclusive)
		return ti_sci->ops.dev_ops.get_device_exclusive(ti_sci,
								pd->idx);
	else
		return ti_sci->ops.dev_ops.get_device(ti_sci, pd->idx);
}

/*
 * ti_sci_pd_xlate(): translation service for TI SCI genpds
 * @genpdspec: DT identification data for the genpd
 * @data: genpd core data for all the powerdomains on the device
 */
static struct generic_pm_domain *ti_sci_pd_xlate(
					struct of_phandle_args *genpdspec,
					void *data)
{
	struct genpd_onecell_data *genpd_data = data;
	unsigned int idx = genpdspec->args[0];

	if (genpdspec->args_count != 1 && genpdspec->args_count != 2)
		return ERR_PTR(-EINVAL);

	if (idx >= genpd_data->num_domains) {
		pr_err("%s: invalid domain index %u\n", __func__, idx);
		return ERR_PTR(-EINVAL);
	}

	if (!genpd_data->domains[idx])
		return ERR_PTR(-ENOENT);

	genpd_to_ti_sci_pd(genpd_data->domains[idx])->exclusive =
		genpdspec->args[1];

	return genpd_data->domains[idx];
}

static const struct of_device_id ti_sci_pm_domain_matches[] = {
	{ .compatible = "ti,sci-pm-domain", },
	{ },
};
MODULE_DEVICE_TABLE(of, ti_sci_pm_domain_matches);

static int ti_sci_pm_domain_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct ti_sci_genpd_provider *pd_provider;
	struct ti_sci_pm_domain *pd;
	struct device_node *np;
	struct of_phandle_args args;
	int ret;
	u32 max_id = 0;
	int index;

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

	pd_provider->ti_sci = devm_ti_sci_get_handle(dev);
	if (IS_ERR(pd_provider->ti_sci))
		return PTR_ERR(pd_provider->ti_sci);

	pd_provider->dev = dev;

	INIT_LIST_HEAD(&pd_provider->pd_list);

	/* Find highest device ID used for power domains */
	for_each_node_with_property(np, "power-domains") {
		index = 0;

		while (1) {
			ret = of_parse_phandle_with_args(np, "power-domains",
							 "#power-domain-cells",
							 index, &args);
			if (ret)
				break;

			if (args.args_count >= 1 && args.np == dev->of_node) {
				if (args.args[0] > max_id)
					max_id = args.args[0];

				pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
				if (!pd) {
					of_node_put(np);
					return -ENOMEM;
				}

				pd->pd.name = devm_kasprintf(dev, GFP_KERNEL,
							     "pd:%d",
							     args.args[0]);
				if (!pd->pd.name) {
					of_node_put(np);
					return -ENOMEM;
				}

				pd->pd.power_off = ti_sci_pd_power_off;
				pd->pd.power_on = ti_sci_pd_power_on;
				pd->idx = args.args[0];
				pd->parent = pd_provider;

				pm_genpd_init(&pd->pd, NULL, true);

				list_add(&pd->node, &pd_provider->pd_list);
			}
			index++;
		}
	}

	pd_provider->data.domains =
		devm_kcalloc(dev, max_id + 1,
			     sizeof(*pd_provider->data.domains),
			     GFP_KERNEL);
	if (!pd_provider->data.domains)
		return -ENOMEM;

	pd_provider->data.num_domains = max_id + 1;
	pd_provider->data.xlate = ti_sci_pd_xlate;

	list_for_each_entry(pd, &pd_provider->pd_list, node)
		pd_provider->data.domains[pd->idx] = &pd->pd;

	return of_genpd_add_provider_onecell(dev->of_node, &pd_provider->data);
}

static struct platform_driver ti_sci_pm_domains_driver = {
	.probe = ti_sci_pm_domain_probe,
	.driver = {
		.name = "ti_sci_pm_domains",
		.of_match_table = ti_sci_pm_domain_matches,
	},
};
module_platform_driver(ti_sci_pm_domains_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI System Control Interface (SCI) Power Domain driver");
MODULE_AUTHOR("Dave Gerlach");