1 /*
2 * Actions Semi Owl Smart Power System (SPS)
3 *
4 * Copyright 2012 Actions Semi Inc.
5 * Author: Actions Semi, Inc.
6 *
7 * Copyright (c) 2017 Andreas Färber
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14
15 #include <linux/of_address.h>
16 #include <linux/of_platform.h>
17 #include <linux/pm_domain.h>
18 #include <linux/soc/actions/owl-sps.h>
19 #include <dt-bindings/power/owl-s500-powergate.h>
20 #include <dt-bindings/power/owl-s700-powergate.h>
21
22 struct owl_sps_domain_info {
23 const char *name;
24 int pwr_bit;
25 int ack_bit;
26 unsigned int genpd_flags;
27 };
28
29 struct owl_sps_info {
30 unsigned num_domains;
31 const struct owl_sps_domain_info *domains;
32 };
33
34 struct owl_sps {
35 struct device *dev;
36 const struct owl_sps_info *info;
37 void __iomem *base;
38 struct genpd_onecell_data genpd_data;
39 struct generic_pm_domain *domains[];
40 };
41
42 #define to_owl_pd(gpd) container_of(gpd, struct owl_sps_domain, genpd)
43
44 struct owl_sps_domain {
45 struct generic_pm_domain genpd;
46 const struct owl_sps_domain_info *info;
47 struct owl_sps *sps;
48 };
49
owl_sps_set_power(struct owl_sps_domain * pd,bool enable)50 static int owl_sps_set_power(struct owl_sps_domain *pd, bool enable)
51 {
52 u32 pwr_mask, ack_mask;
53
54 ack_mask = BIT(pd->info->ack_bit);
55 pwr_mask = BIT(pd->info->pwr_bit);
56
57 return owl_sps_set_pg(pd->sps->base, pwr_mask, ack_mask, enable);
58 }
59
owl_sps_power_on(struct generic_pm_domain * domain)60 static int owl_sps_power_on(struct generic_pm_domain *domain)
61 {
62 struct owl_sps_domain *pd = to_owl_pd(domain);
63
64 dev_dbg(pd->sps->dev, "%s power on", pd->info->name);
65
66 return owl_sps_set_power(pd, true);
67 }
68
owl_sps_power_off(struct generic_pm_domain * domain)69 static int owl_sps_power_off(struct generic_pm_domain *domain)
70 {
71 struct owl_sps_domain *pd = to_owl_pd(domain);
72
73 dev_dbg(pd->sps->dev, "%s power off", pd->info->name);
74
75 return owl_sps_set_power(pd, false);
76 }
77
owl_sps_init_domain(struct owl_sps * sps,int index)78 static int owl_sps_init_domain(struct owl_sps *sps, int index)
79 {
80 struct owl_sps_domain *pd;
81
82 pd = devm_kzalloc(sps->dev, sizeof(*pd), GFP_KERNEL);
83 if (!pd)
84 return -ENOMEM;
85
86 pd->info = &sps->info->domains[index];
87 pd->sps = sps;
88
89 pd->genpd.name = pd->info->name;
90 pd->genpd.power_on = owl_sps_power_on;
91 pd->genpd.power_off = owl_sps_power_off;
92 pd->genpd.flags = pd->info->genpd_flags;
93 pm_genpd_init(&pd->genpd, NULL, false);
94
95 sps->genpd_data.domains[index] = &pd->genpd;
96
97 return 0;
98 }
99
owl_sps_probe(struct platform_device * pdev)100 static int owl_sps_probe(struct platform_device *pdev)
101 {
102 const struct of_device_id *match;
103 const struct owl_sps_info *sps_info;
104 struct owl_sps *sps;
105 int i, ret;
106
107 if (!pdev->dev.of_node) {
108 dev_err(&pdev->dev, "no device node\n");
109 return -ENODEV;
110 }
111
112 match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev);
113 if (!match || !match->data) {
114 dev_err(&pdev->dev, "unknown compatible or missing data\n");
115 return -EINVAL;
116 }
117
118 sps_info = match->data;
119
120 sps = devm_kzalloc(&pdev->dev,
121 struct_size(sps, domains, sps_info->num_domains),
122 GFP_KERNEL);
123 if (!sps)
124 return -ENOMEM;
125
126 sps->base = of_io_request_and_map(pdev->dev.of_node, 0, "owl-sps");
127 if (IS_ERR(sps->base)) {
128 dev_err(&pdev->dev, "failed to map sps registers\n");
129 return PTR_ERR(sps->base);
130 }
131
132 sps->dev = &pdev->dev;
133 sps->info = sps_info;
134 sps->genpd_data.domains = sps->domains;
135 sps->genpd_data.num_domains = sps_info->num_domains;
136
137 for (i = 0; i < sps_info->num_domains; i++) {
138 ret = owl_sps_init_domain(sps, i);
139 if (ret)
140 return ret;
141 }
142
143 ret = of_genpd_add_provider_onecell(pdev->dev.of_node, &sps->genpd_data);
144 if (ret) {
145 dev_err(&pdev->dev, "failed to add provider (%d)", ret);
146 return ret;
147 }
148
149 return 0;
150 }
151
152 static const struct owl_sps_domain_info s500_sps_domains[] = {
153 [S500_PD_VDE] = {
154 .name = "VDE",
155 .pwr_bit = 0,
156 .ack_bit = 16,
157 },
158 [S500_PD_VCE_SI] = {
159 .name = "VCE_SI",
160 .pwr_bit = 1,
161 .ack_bit = 17,
162 },
163 [S500_PD_USB2_1] = {
164 .name = "USB2_1",
165 .pwr_bit = 2,
166 .ack_bit = 18,
167 },
168 [S500_PD_CPU2] = {
169 .name = "CPU2",
170 .pwr_bit = 5,
171 .ack_bit = 21,
172 .genpd_flags = GENPD_FLAG_ALWAYS_ON,
173 },
174 [S500_PD_CPU3] = {
175 .name = "CPU3",
176 .pwr_bit = 6,
177 .ack_bit = 22,
178 .genpd_flags = GENPD_FLAG_ALWAYS_ON,
179 },
180 [S500_PD_DMA] = {
181 .name = "DMA",
182 .pwr_bit = 8,
183 .ack_bit = 12,
184 },
185 [S500_PD_DS] = {
186 .name = "DS",
187 .pwr_bit = 9,
188 .ack_bit = 13,
189 },
190 [S500_PD_USB3] = {
191 .name = "USB3",
192 .pwr_bit = 10,
193 .ack_bit = 14,
194 },
195 [S500_PD_USB2_0] = {
196 .name = "USB2_0",
197 .pwr_bit = 11,
198 .ack_bit = 15,
199 },
200 };
201
202 static const struct owl_sps_info s500_sps_info = {
203 .num_domains = ARRAY_SIZE(s500_sps_domains),
204 .domains = s500_sps_domains,
205 };
206
207 static const struct owl_sps_domain_info s700_sps_domains[] = {
208 [S700_PD_VDE] = {
209 .name = "VDE",
210 .pwr_bit = 0,
211 },
212 [S700_PD_VCE_SI] = {
213 .name = "VCE_SI",
214 .pwr_bit = 1,
215 },
216 [S700_PD_USB2_1] = {
217 .name = "USB2_1",
218 .pwr_bit = 2,
219 },
220 [S700_PD_HDE] = {
221 .name = "HDE",
222 .pwr_bit = 7,
223 },
224 [S700_PD_DMA] = {
225 .name = "DMA",
226 .pwr_bit = 8,
227 },
228 [S700_PD_DS] = {
229 .name = "DS",
230 .pwr_bit = 9,
231 },
232 [S700_PD_USB3] = {
233 .name = "USB3",
234 .pwr_bit = 10,
235 },
236 [S700_PD_USB2_0] = {
237 .name = "USB2_0",
238 .pwr_bit = 11,
239 },
240 };
241
242 static const struct owl_sps_info s700_sps_info = {
243 .num_domains = ARRAY_SIZE(s700_sps_domains),
244 .domains = s700_sps_domains,
245 };
246
247 static const struct of_device_id owl_sps_of_matches[] = {
248 { .compatible = "actions,s500-sps", .data = &s500_sps_info },
249 { .compatible = "actions,s700-sps", .data = &s700_sps_info },
250 { }
251 };
252
253 static struct platform_driver owl_sps_platform_driver = {
254 .probe = owl_sps_probe,
255 .driver = {
256 .name = "owl-sps",
257 .of_match_table = owl_sps_of_matches,
258 .suppress_bind_attrs = true,
259 },
260 };
261
owl_sps_init(void)262 static int __init owl_sps_init(void)
263 {
264 return platform_driver_register(&owl_sps_platform_driver);
265 }
266 postcore_initcall(owl_sps_init);
267
