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52835d59 DG |
1 | /* |
2 | * TI SCI Generic Power Domain Driver | |
3 | * | |
7574f67e | 4 | * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/ |
52835d59 DG |
5 | * J Keerthy <j-keerthy@ti.com> |
6 | * Dave Gerlach <d-gerlach@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/err.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/of.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/pm_domain.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/soc/ti/ti_sci_protocol.h> | |
26 | ||
27 | /** | |
28 | * struct ti_sci_genpd_dev_data: holds data needed for every device attached | |
29 | * to this genpd | |
30 | * @idx: index of the device that identifies it with the system | |
31 | * control processor. | |
32 | */ | |
33 | struct ti_sci_genpd_dev_data { | |
34 | int idx; | |
35 | }; | |
36 | ||
37 | /** | |
38 | * struct ti_sci_pm_domain: TI specific data needed for power domain | |
39 | * @ti_sci: handle to TI SCI protocol driver that provides ops to | |
40 | * communicate with system control processor. | |
41 | * @dev: pointer to dev for the driver for devm allocs | |
42 | * @pd: generic_pm_domain for use with the genpd framework | |
43 | */ | |
44 | struct ti_sci_pm_domain { | |
45 | const struct ti_sci_handle *ti_sci; | |
46 | struct device *dev; | |
47 | struct generic_pm_domain pd; | |
48 | }; | |
49 | ||
50 | #define genpd_to_ti_sci_pd(gpd) container_of(gpd, struct ti_sci_pm_domain, pd) | |
51 | ||
52 | /** | |
53 | * ti_sci_dev_id(): get prepopulated ti_sci id from struct dev | |
54 | * @dev: pointer to device associated with this genpd | |
55 | * | |
56 | * Returns device_id stored from ti,sci_id property | |
57 | */ | |
58 | static int ti_sci_dev_id(struct device *dev) | |
59 | { | |
60 | struct generic_pm_domain_data *genpd_data = dev_gpd_data(dev); | |
61 | struct ti_sci_genpd_dev_data *sci_dev_data = genpd_data->data; | |
62 | ||
63 | return sci_dev_data->idx; | |
64 | } | |
65 | ||
66 | /** | |
67 | * ti_sci_dev_to_sci_handle(): get pointer to ti_sci_handle | |
68 | * @dev: pointer to device associated with this genpd | |
69 | * | |
70 | * Returns ti_sci_handle to be used to communicate with system | |
71 | * control processor. | |
72 | */ | |
73 | static const struct ti_sci_handle *ti_sci_dev_to_sci_handle(struct device *dev) | |
74 | { | |
75 | struct generic_pm_domain *pd = pd_to_genpd(dev->pm_domain); | |
76 | struct ti_sci_pm_domain *ti_sci_genpd = genpd_to_ti_sci_pd(pd); | |
77 | ||
78 | return ti_sci_genpd->ti_sci; | |
79 | } | |
80 | ||
81 | /** | |
82 | * ti_sci_dev_start(): genpd device start hook called to turn device on | |
83 | * @dev: pointer to device associated with this genpd to be powered on | |
84 | */ | |
85 | static int ti_sci_dev_start(struct device *dev) | |
86 | { | |
87 | const struct ti_sci_handle *ti_sci = ti_sci_dev_to_sci_handle(dev); | |
88 | int idx = ti_sci_dev_id(dev); | |
89 | ||
90 | return ti_sci->ops.dev_ops.get_device(ti_sci, idx); | |
91 | } | |
92 | ||
93 | /** | |
94 | * ti_sci_dev_stop(): genpd device stop hook called to turn device off | |
95 | * @dev: pointer to device associated with this genpd to be powered off | |
96 | */ | |
97 | static int ti_sci_dev_stop(struct device *dev) | |
98 | { | |
99 | const struct ti_sci_handle *ti_sci = ti_sci_dev_to_sci_handle(dev); | |
100 | int idx = ti_sci_dev_id(dev); | |
101 | ||
102 | return ti_sci->ops.dev_ops.put_device(ti_sci, idx); | |
103 | } | |
104 | ||
105 | static int ti_sci_pd_attach_dev(struct generic_pm_domain *domain, | |
106 | struct device *dev) | |
107 | { | |
108 | struct device_node *np = dev->of_node; | |
109 | struct of_phandle_args pd_args; | |
110 | struct ti_sci_pm_domain *ti_sci_genpd = genpd_to_ti_sci_pd(domain); | |
111 | const struct ti_sci_handle *ti_sci = ti_sci_genpd->ti_sci; | |
112 | struct ti_sci_genpd_dev_data *sci_dev_data; | |
113 | struct generic_pm_domain_data *genpd_data; | |
114 | int idx, ret = 0; | |
115 | ||
116 | ret = of_parse_phandle_with_args(np, "power-domains", | |
117 | "#power-domain-cells", 0, &pd_args); | |
118 | if (ret < 0) | |
119 | return ret; | |
120 | ||
121 | if (pd_args.args_count != 1) | |
122 | return -EINVAL; | |
123 | ||
124 | idx = pd_args.args[0]; | |
125 | ||
126 | /* | |
127 | * Check the validity of the requested idx, if the index is not valid | |
128 | * the PMMC will return a NAK here and we will not allocate it. | |
129 | */ | |
130 | ret = ti_sci->ops.dev_ops.is_valid(ti_sci, idx); | |
131 | if (ret) | |
132 | return -EINVAL; | |
133 | ||
134 | sci_dev_data = kzalloc(sizeof(*sci_dev_data), GFP_KERNEL); | |
135 | if (!sci_dev_data) | |
136 | return -ENOMEM; | |
137 | ||
138 | sci_dev_data->idx = idx; | |
139 | ||
140 | genpd_data = dev_gpd_data(dev); | |
141 | genpd_data->data = sci_dev_data; | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static void ti_sci_pd_detach_dev(struct generic_pm_domain *domain, | |
147 | struct device *dev) | |
148 | { | |
149 | struct generic_pm_domain_data *genpd_data = dev_gpd_data(dev); | |
150 | struct ti_sci_genpd_dev_data *sci_dev_data = genpd_data->data; | |
151 | ||
152 | kfree(sci_dev_data); | |
153 | genpd_data->data = NULL; | |
154 | } | |
155 | ||
156 | static const struct of_device_id ti_sci_pm_domain_matches[] = { | |
157 | { .compatible = "ti,sci-pm-domain", }, | |
158 | { }, | |
159 | }; | |
160 | MODULE_DEVICE_TABLE(of, ti_sci_pm_domain_matches); | |
161 | ||
162 | static int ti_sci_pm_domain_probe(struct platform_device *pdev) | |
163 | { | |
164 | struct device *dev = &pdev->dev; | |
165 | struct device_node *np = dev->of_node; | |
166 | struct ti_sci_pm_domain *ti_sci_pd; | |
167 | int ret; | |
168 | ||
169 | ti_sci_pd = devm_kzalloc(dev, sizeof(*ti_sci_pd), GFP_KERNEL); | |
170 | if (!ti_sci_pd) | |
171 | return -ENOMEM; | |
172 | ||
173 | ti_sci_pd->ti_sci = devm_ti_sci_get_handle(dev); | |
174 | if (IS_ERR(ti_sci_pd->ti_sci)) | |
175 | return PTR_ERR(ti_sci_pd->ti_sci); | |
176 | ||
177 | ti_sci_pd->dev = dev; | |
178 | ||
4dd6a997 DG |
179 | ti_sci_pd->pd.name = "ti_sci_pd"; |
180 | ||
52835d59 DG |
181 | ti_sci_pd->pd.attach_dev = ti_sci_pd_attach_dev; |
182 | ti_sci_pd->pd.detach_dev = ti_sci_pd_detach_dev; | |
183 | ||
184 | ti_sci_pd->pd.dev_ops.start = ti_sci_dev_start; | |
185 | ti_sci_pd->pd.dev_ops.stop = ti_sci_dev_stop; | |
186 | ||
187 | pm_genpd_init(&ti_sci_pd->pd, NULL, true); | |
188 | ||
189 | ret = of_genpd_add_provider_simple(np, &ti_sci_pd->pd); | |
190 | ||
191 | return ret; | |
192 | } | |
193 | ||
194 | static struct platform_driver ti_sci_pm_domains_driver = { | |
195 | .probe = ti_sci_pm_domain_probe, | |
196 | .driver = { | |
197 | .name = "ti_sci_pm_domains", | |
198 | .of_match_table = ti_sci_pm_domain_matches, | |
199 | }, | |
200 | }; | |
201 | module_platform_driver(ti_sci_pm_domains_driver); | |
202 | MODULE_LICENSE("GPL v2"); | |
203 | MODULE_DESCRIPTION("TI System Control Interface (SCI) Power Domain driver"); | |
204 | MODULE_AUTHOR("Dave Gerlach"); |