1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * BCM63xx Power Domain Controller Driver
4 *
5 * Copyright (C) 2020 Álvaro Fernández Rojas <noltari@gmail.com>
6 */
7
8#include <dt-bindings/soc/bcm6318-pm.h>
9#include <dt-bindings/soc/bcm6328-pm.h>
10#include <dt-bindings/soc/bcm6362-pm.h>
11#include <dt-bindings/soc/bcm63268-pm.h>
12#include <linux/io.h>
13#include <linux/module.h>
14#include <linux/platform_device.h>
15#include <linux/pm_domain.h>
16#include <linux/of.h>
17
18struct bcm63xx_power_dev {
19 struct generic_pm_domain genpd;
20 struct bcm63xx_power *power;
21 uint32_t mask;
22};
23
24struct bcm63xx_power {
25 void __iomem *base;
26 spinlock_t lock;
27 struct bcm63xx_power_dev *dev;
28 struct genpd_onecell_data genpd_data;
29 struct generic_pm_domain **genpd;
30};
31
32struct bcm63xx_power_data {
33 const char * const name;
34 uint8_t bit;
35 unsigned int flags;
36};
37
38static int bcm63xx_power_get_state(struct bcm63xx_power_dev *pmd, bool *is_on)
39{
40 struct bcm63xx_power *power = pmd->power;
41
42 if (!pmd->mask) {
43 *is_on = false;
44 return -EINVAL;
45 }
46
47 *is_on = !(__raw_readl(addr: power->base) & pmd->mask);
48
49 return 0;
50}
51
52static int bcm63xx_power_set_state(struct bcm63xx_power_dev *pmd, bool on)
53{
54 struct bcm63xx_power *power = pmd->power;
55 unsigned long flags;
56 uint32_t val;
57
58 if (!pmd->mask)
59 return -EINVAL;
60
61 spin_lock_irqsave(&power->lock, flags);
62 val = __raw_readl(addr: power->base);
63 if (on)
64 val &= ~pmd->mask;
65 else
66 val |= pmd->mask;
67 __raw_writel(val, addr: power->base);
68 spin_unlock_irqrestore(lock: &power->lock, flags);
69
70 return 0;
71}
72
73static int bcm63xx_power_on(struct generic_pm_domain *genpd)
74{
75 struct bcm63xx_power_dev *pmd = container_of(genpd,
76 struct bcm63xx_power_dev, genpd);
77
78 return bcm63xx_power_set_state(pmd, on: true);
79}
80
81static int bcm63xx_power_off(struct generic_pm_domain *genpd)
82{
83 struct bcm63xx_power_dev *pmd = container_of(genpd,
84 struct bcm63xx_power_dev, genpd);
85
86 return bcm63xx_power_set_state(pmd, on: false);
87}
88
89static int bcm63xx_power_probe(struct platform_device *pdev)
90{
91 struct device *dev = &pdev->dev;
92 struct device_node *np = dev->of_node;
93 const struct bcm63xx_power_data *entry, *table;
94 struct bcm63xx_power *power;
95 unsigned int ndom;
96 uint8_t max_bit = 0;
97 int ret;
98
99 power = devm_kzalloc(dev, size: sizeof(*power), GFP_KERNEL);
100 if (!power)
101 return -ENOMEM;
102
103 power->base = devm_platform_ioremap_resource(pdev, index: 0);
104 if (IS_ERR(ptr: power->base))
105 return PTR_ERR(ptr: power->base);
106
107 table = of_device_get_match_data(dev);
108 if (!table)
109 return -EINVAL;
110
111 power->genpd_data.num_domains = 0;
112 ndom = 0;
113 for (entry = table; entry->name; entry++) {
114 max_bit = max(max_bit, entry->bit);
115 ndom++;
116 }
117
118 if (!ndom)
119 return -ENODEV;
120
121 power->genpd_data.num_domains = max_bit + 1;
122
123 power->dev = devm_kcalloc(dev, n: power->genpd_data.num_domains,
124 size: sizeof(struct bcm63xx_power_dev),
125 GFP_KERNEL);
126 if (!power->dev)
127 return -ENOMEM;
128
129 power->genpd = devm_kcalloc(dev, n: power->genpd_data.num_domains,
130 size: sizeof(struct generic_pm_domain *),
131 GFP_KERNEL);
132 if (!power->genpd)
133 return -ENOMEM;
134
135 power->genpd_data.domains = power->genpd;
136
137 ndom = 0;
138 for (entry = table; entry->name; entry++) {
139 struct bcm63xx_power_dev *pmd = &power->dev[ndom];
140 bool is_on;
141
142 pmd->power = power;
143 pmd->mask = BIT(entry->bit);
144 pmd->genpd.name = entry->name;
145 pmd->genpd.flags = entry->flags;
146
147 ret = bcm63xx_power_get_state(pmd, is_on: &is_on);
148 if (ret)
149 dev_warn(dev, "unable to get current state for %s\n",
150 pmd->genpd.name);
151
152 pmd->genpd.power_on = bcm63xx_power_on;
153 pmd->genpd.power_off = bcm63xx_power_off;
154
155 pm_genpd_init(genpd: &pmd->genpd, NULL, is_off: !is_on);
156 power->genpd[entry->bit] = &pmd->genpd;
157
158 ndom++;
159 }
160
161 spin_lock_init(&power->lock);
162
163 ret = of_genpd_add_provider_onecell(np, data: &power->genpd_data);
164 if (ret) {
165 dev_err(dev, "failed to register genpd driver: %d\n", ret);
166 return ret;
167 }
168
169 dev_info(dev, "registered %u power domains\n", ndom);
170
171 return 0;
172}
173
174static const struct bcm63xx_power_data bcm6318_power_domains[] = {
175 {
176 .name = "pcie",
177 .bit = BCM6318_POWER_DOMAIN_PCIE,
178 }, {
179 .name = "usb",
180 .bit = BCM6318_POWER_DOMAIN_USB,
181 }, {
182 .name = "ephy0",
183 .bit = BCM6318_POWER_DOMAIN_EPHY0,
184 }, {
185 .name = "ephy1",
186 .bit = BCM6318_POWER_DOMAIN_EPHY1,
187 }, {
188 .name = "ephy2",
189 .bit = BCM6318_POWER_DOMAIN_EPHY2,
190 }, {
191 .name = "ephy3",
192 .bit = BCM6318_POWER_DOMAIN_EPHY3,
193 }, {
194 .name = "ldo2p5",
195 .bit = BCM6318_POWER_DOMAIN_LDO2P5,
196 .flags = GENPD_FLAG_ALWAYS_ON,
197 }, {
198 .name = "ldo2p9",
199 .bit = BCM6318_POWER_DOMAIN_LDO2P9,
200 .flags = GENPD_FLAG_ALWAYS_ON,
201 }, {
202 .name = "sw1p0",
203 .bit = BCM6318_POWER_DOMAIN_SW1P0,
204 .flags = GENPD_FLAG_ALWAYS_ON,
205 }, {
206 .name = "pad",
207 .bit = BCM6318_POWER_DOMAIN_PAD,
208 .flags = GENPD_FLAG_ALWAYS_ON,
209 }, {
210 /* sentinel */
211 },
212};
213
214static const struct bcm63xx_power_data bcm6328_power_domains[] = {
215 {
216 .name = "adsl2-mips",
217 .bit = BCM6328_POWER_DOMAIN_ADSL2_MIPS,
218 }, {
219 .name = "adsl2-phy",
220 .bit = BCM6328_POWER_DOMAIN_ADSL2_PHY,
221 }, {
222 .name = "adsl2-afe",
223 .bit = BCM6328_POWER_DOMAIN_ADSL2_AFE,
224 }, {
225 .name = "sar",
226 .bit = BCM6328_POWER_DOMAIN_SAR,
227 }, {
228 .name = "pcm",
229 .bit = BCM6328_POWER_DOMAIN_PCM,
230 }, {
231 .name = "usbd",
232 .bit = BCM6328_POWER_DOMAIN_USBD,
233 }, {
234 .name = "usbh",
235 .bit = BCM6328_POWER_DOMAIN_USBH,
236 }, {
237 .name = "pcie",
238 .bit = BCM6328_POWER_DOMAIN_PCIE,
239 }, {
240 .name = "robosw",
241 .bit = BCM6328_POWER_DOMAIN_ROBOSW,
242 }, {
243 .name = "ephy",
244 .bit = BCM6328_POWER_DOMAIN_EPHY,
245 }, {
246 /* sentinel */
247 },
248};
249
250static const struct bcm63xx_power_data bcm6362_power_domains[] = {
251 {
252 .name = "sar",
253 .bit = BCM6362_POWER_DOMAIN_SAR,
254 }, {
255 .name = "ipsec",
256 .bit = BCM6362_POWER_DOMAIN_IPSEC,
257 }, {
258 .name = "mips",
259 .bit = BCM6362_POWER_DOMAIN_MIPS,
260 .flags = GENPD_FLAG_ALWAYS_ON,
261 }, {
262 .name = "dect",
263 .bit = BCM6362_POWER_DOMAIN_DECT,
264 }, {
265 .name = "usbh",
266 .bit = BCM6362_POWER_DOMAIN_USBH,
267 }, {
268 .name = "usbd",
269 .bit = BCM6362_POWER_DOMAIN_USBD,
270 }, {
271 .name = "robosw",
272 .bit = BCM6362_POWER_DOMAIN_ROBOSW,
273 }, {
274 .name = "pcm",
275 .bit = BCM6362_POWER_DOMAIN_PCM,
276 }, {
277 .name = "periph",
278 .bit = BCM6362_POWER_DOMAIN_PERIPH,
279 .flags = GENPD_FLAG_ALWAYS_ON,
280 }, {
281 .name = "adsl-phy",
282 .bit = BCM6362_POWER_DOMAIN_ADSL_PHY,
283 }, {
284 .name = "gmii-pads",
285 .bit = BCM6362_POWER_DOMAIN_GMII_PADS,
286 }, {
287 .name = "fap",
288 .bit = BCM6362_POWER_DOMAIN_FAP,
289 }, {
290 .name = "pcie",
291 .bit = BCM6362_POWER_DOMAIN_PCIE,
292 }, {
293 .name = "wlan-pads",
294 .bit = BCM6362_POWER_DOMAIN_WLAN_PADS,
295 }, {
296 /* sentinel */
297 },
298};
299
300static const struct bcm63xx_power_data bcm63268_power_domains[] = {
301 {
302 .name = "sar",
303 .bit = BCM63268_POWER_DOMAIN_SAR,
304 }, {
305 .name = "ipsec",
306 .bit = BCM63268_POWER_DOMAIN_IPSEC,
307 }, {
308 .name = "mips",
309 .bit = BCM63268_POWER_DOMAIN_MIPS,
310 .flags = GENPD_FLAG_ALWAYS_ON,
311 }, {
312 .name = "dect",
313 .bit = BCM63268_POWER_DOMAIN_DECT,
314 }, {
315 .name = "usbh",
316 .bit = BCM63268_POWER_DOMAIN_USBH,
317 }, {
318 .name = "usbd",
319 .bit = BCM63268_POWER_DOMAIN_USBD,
320 }, {
321 .name = "robosw",
322 .bit = BCM63268_POWER_DOMAIN_ROBOSW,
323 }, {
324 .name = "pcm",
325 .bit = BCM63268_POWER_DOMAIN_PCM,
326 }, {
327 .name = "periph",
328 .bit = BCM63268_POWER_DOMAIN_PERIPH,
329 .flags = GENPD_FLAG_ALWAYS_ON,
330 }, {
331 .name = "vdsl-phy",
332 .bit = BCM63268_POWER_DOMAIN_VDSL_PHY,
333 }, {
334 .name = "vdsl-mips",
335 .bit = BCM63268_POWER_DOMAIN_VDSL_MIPS,
336 }, {
337 .name = "fap",
338 .bit = BCM63268_POWER_DOMAIN_FAP,
339 }, {
340 .name = "pcie",
341 .bit = BCM63268_POWER_DOMAIN_PCIE,
342 }, {
343 .name = "wlan-pads",
344 .bit = BCM63268_POWER_DOMAIN_WLAN_PADS,
345 }, {
346 /* sentinel */
347 },
348};
349
350static const struct of_device_id bcm63xx_power_of_match[] = {
351 {
352 .compatible = "brcm,bcm6318-power-controller",
353 .data = &bcm6318_power_domains,
354 }, {
355 .compatible = "brcm,bcm6328-power-controller",
356 .data = &bcm6328_power_domains,
357 }, {
358 .compatible = "brcm,bcm6362-power-controller",
359 .data = &bcm6362_power_domains,
360 }, {
361 .compatible = "brcm,bcm63268-power-controller",
362 .data = &bcm63268_power_domains,
363 }, {
364 /* sentinel */
365 }
366};
367
368static struct platform_driver bcm63xx_power_driver = {
369 .driver = {
370 .name = "bcm63xx-power-controller",
371 .of_match_table = bcm63xx_power_of_match,
372 },
373 .probe = bcm63xx_power_probe,
374};
375builtin_platform_driver(bcm63xx_power_driver);
376

source code of linux/drivers/pmdomain/bcm/bcm63xx-power.c