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/module.h>
8 #include <linux/mutex.h>
9 #include <linux/pm_domain.h>
10 #include <linux/slab.h>
11 #include <linux/of.h>
12 #include <linux/of_device.h>
13 #include <linux/platform_device.h>
14 #include <linux/pm_opp.h>
15 #include <soc/qcom/cmd-db.h>
16 #include <soc/qcom/rpmh.h>
17 #include <dt-bindings/power/qcom-rpmpd.h>
18
19 #define domain_to_rpmhpd(domain) container_of(domain, struct rpmhpd, pd)
20
21 #define RPMH_ARC_MAX_LEVELS 16
22
23 /**
24 * struct rpmhpd - top level RPMh power domain resource data structure
25 * @dev: rpmh power domain controller device
26 * @pd: generic_pm_domain corrresponding to the power domain
27 * @parent: generic_pm_domain corrresponding to the parent's power domain
28 * @peer: A peer power domain in case Active only Voting is
29 * supported
30 * @active_only: True if it represents an Active only peer
31 * @corner: current corner
32 * @active_corner: current active corner
33 * @enable_corner: lowest non-zero corner
34 * @level: An array of level (vlvl) to corner (hlvl) mappings
35 * derived from cmd-db
36 * @level_count: Number of levels supported by the power domain. max
37 * being 16 (0 - 15)
38 * @enabled: true if the power domain is enabled
39 * @res_name: Resource name used for cmd-db lookup
40 * @addr: Resource address as looped up using resource name from
41 * cmd-db
42 */
43 struct rpmhpd {
44 struct device *dev;
45 struct generic_pm_domain pd;
46 struct generic_pm_domain *parent;
47 struct rpmhpd *peer;
48 const bool active_only;
49 unsigned int corner;
50 unsigned int active_corner;
51 unsigned int enable_corner;
52 u32 level[RPMH_ARC_MAX_LEVELS];
53 size_t level_count;
54 bool enabled;
55 const char *res_name;
56 u32 addr;
57 };
58
59 struct rpmhpd_desc {
60 struct rpmhpd **rpmhpds;
61 size_t num_pds;
62 };
63
64 static DEFINE_MUTEX(rpmhpd_lock);
65
66 /* SDM845 RPMH powerdomains */
67
68 static struct rpmhpd sdm845_ebi = {
69 .pd = { .name = "ebi", },
70 .res_name = "ebi.lvl",
71 };
72
73 static struct rpmhpd sdm845_lmx = {
74 .pd = { .name = "lmx", },
75 .res_name = "lmx.lvl",
76 };
77
78 static struct rpmhpd sdm845_lcx = {
79 .pd = { .name = "lcx", },
80 .res_name = "lcx.lvl",
81 };
82
83 static struct rpmhpd sdm845_gfx = {
84 .pd = { .name = "gfx", },
85 .res_name = "gfx.lvl",
86 };
87
88 static struct rpmhpd sdm845_mss = {
89 .pd = { .name = "mss", },
90 .res_name = "mss.lvl",
91 };
92
93 static struct rpmhpd sdm845_mx_ao;
94 static struct rpmhpd sdm845_mx = {
95 .pd = { .name = "mx", },
96 .peer = &sdm845_mx_ao,
97 .res_name = "mx.lvl",
98 };
99
100 static struct rpmhpd sdm845_mx_ao = {
101 .pd = { .name = "mx_ao", },
102 .active_only = true,
103 .peer = &sdm845_mx,
104 .res_name = "mx.lvl",
105 };
106
107 static struct rpmhpd sdm845_cx_ao;
108 static struct rpmhpd sdm845_cx = {
109 .pd = { .name = "cx", },
110 .peer = &sdm845_cx_ao,
111 .parent = &sdm845_mx.pd,
112 .res_name = "cx.lvl",
113 };
114
115 static struct rpmhpd sdm845_cx_ao = {
116 .pd = { .name = "cx_ao", },
117 .active_only = true,
118 .peer = &sdm845_cx,
119 .parent = &sdm845_mx_ao.pd,
120 .res_name = "cx.lvl",
121 };
122
123 static struct rpmhpd *sdm845_rpmhpds[] = {
124 [SDM845_EBI] = &sdm845_ebi,
125 [SDM845_MX] = &sdm845_mx,
126 [SDM845_MX_AO] = &sdm845_mx_ao,
127 [SDM845_CX] = &sdm845_cx,
128 [SDM845_CX_AO] = &sdm845_cx_ao,
129 [SDM845_LMX] = &sdm845_lmx,
130 [SDM845_LCX] = &sdm845_lcx,
131 [SDM845_GFX] = &sdm845_gfx,
132 [SDM845_MSS] = &sdm845_mss,
133 };
134
135 static const struct rpmhpd_desc sdm845_desc = {
136 .rpmhpds = sdm845_rpmhpds,
137 .num_pds = ARRAY_SIZE(sdm845_rpmhpds),
138 };
139
140 /* SM8150 RPMH powerdomains */
141
142 static struct rpmhpd sm8150_mmcx_ao;
143 static struct rpmhpd sm8150_mmcx = {
144 .pd = { .name = "mmcx", },
145 .peer = &sm8150_mmcx_ao,
146 .res_name = "mmcx.lvl",
147 };
148
149 static struct rpmhpd sm8150_mmcx_ao = {
150 .pd = { .name = "mmcx_ao", },
151 .active_only = true,
152 .peer = &sm8150_mmcx,
153 .res_name = "mmcx.lvl",
154 };
155
156 static struct rpmhpd *sm8150_rpmhpds[] = {
157 [SM8150_MSS] = &sdm845_mss,
158 [SM8150_EBI] = &sdm845_ebi,
159 [SM8150_LMX] = &sdm845_lmx,
160 [SM8150_LCX] = &sdm845_lcx,
161 [SM8150_GFX] = &sdm845_gfx,
162 [SM8150_MX] = &sdm845_mx,
163 [SM8150_MX_AO] = &sdm845_mx_ao,
164 [SM8150_CX] = &sdm845_cx,
165 [SM8150_CX_AO] = &sdm845_cx_ao,
166 [SM8150_MMCX] = &sm8150_mmcx,
167 [SM8150_MMCX_AO] = &sm8150_mmcx_ao,
168 };
169
170 static const struct rpmhpd_desc sm8150_desc = {
171 .rpmhpds = sm8150_rpmhpds,
172 .num_pds = ARRAY_SIZE(sm8150_rpmhpds),
173 };
174
175 static struct rpmhpd *sm8250_rpmhpds[] = {
176 [SM8250_CX] = &sdm845_cx,
177 [SM8250_CX_AO] = &sdm845_cx_ao,
178 [SM8250_EBI] = &sdm845_ebi,
179 [SM8250_GFX] = &sdm845_gfx,
180 [SM8250_LCX] = &sdm845_lcx,
181 [SM8250_LMX] = &sdm845_lmx,
182 [SM8250_MMCX] = &sm8150_mmcx,
183 [SM8250_MMCX_AO] = &sm8150_mmcx_ao,
184 [SM8250_MX] = &sdm845_mx,
185 [SM8250_MX_AO] = &sdm845_mx_ao,
186 };
187
188 static const struct rpmhpd_desc sm8250_desc = {
189 .rpmhpds = sm8250_rpmhpds,
190 .num_pds = ARRAY_SIZE(sm8250_rpmhpds),
191 };
192
193 /* SC7180 RPMH powerdomains */
194 static struct rpmhpd *sc7180_rpmhpds[] = {
195 [SC7180_CX] = &sdm845_cx,
196 [SC7180_CX_AO] = &sdm845_cx_ao,
197 [SC7180_GFX] = &sdm845_gfx,
198 [SC7180_MX] = &sdm845_mx,
199 [SC7180_MX_AO] = &sdm845_mx_ao,
200 [SC7180_LMX] = &sdm845_lmx,
201 [SC7180_LCX] = &sdm845_lcx,
202 [SC7180_MSS] = &sdm845_mss,
203 };
204
205 static const struct rpmhpd_desc sc7180_desc = {
206 .rpmhpds = sc7180_rpmhpds,
207 .num_pds = ARRAY_SIZE(sc7180_rpmhpds),
208 };
209
210 static const struct of_device_id rpmhpd_match_table[] = {
211 { .compatible = "qcom,sc7180-rpmhpd", .data = &sc7180_desc },
212 { .compatible = "qcom,sdm845-rpmhpd", .data = &sdm845_desc },
213 { .compatible = "qcom,sm8150-rpmhpd", .data = &sm8150_desc },
214 { .compatible = "qcom,sm8250-rpmhpd", .data = &sm8250_desc },
215 { }
216 };
217 MODULE_DEVICE_TABLE(of, rpmhpd_match_table);
218
rpmhpd_send_corner(struct rpmhpd * pd,int state,unsigned int corner,bool sync)219 static int rpmhpd_send_corner(struct rpmhpd *pd, int state,
220 unsigned int corner, bool sync)
221 {
222 struct tcs_cmd cmd = {
223 .addr = pd->addr,
224 .data = corner,
225 };
226
227 /*
228 * Wait for an ack only when we are increasing the
229 * perf state of the power domain
230 */
231 if (sync)
232 return rpmh_write(pd->dev, state, &cmd, 1);
233 else
234 return rpmh_write_async(pd->dev, state, &cmd, 1);
235 }
236
to_active_sleep(struct rpmhpd * pd,unsigned int corner,unsigned int * active,unsigned int * sleep)237 static void to_active_sleep(struct rpmhpd *pd, unsigned int corner,
238 unsigned int *active, unsigned int *sleep)
239 {
240 *active = corner;
241
242 if (pd->active_only)
243 *sleep = 0;
244 else
245 *sleep = *active;
246 }
247
248 /*
249 * This function is used to aggregate the votes across the active only
250 * resources and its peers. The aggregated votes are sent to RPMh as
251 * ACTIVE_ONLY votes (which take effect immediately), as WAKE_ONLY votes
252 * (applied by RPMh on system wakeup) and as SLEEP votes (applied by RPMh
253 * on system sleep).
254 * We send ACTIVE_ONLY votes for resources without any peers. For others,
255 * which have an active only peer, all 3 votes are sent.
256 */
rpmhpd_aggregate_corner(struct rpmhpd * pd,unsigned int corner)257 static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner)
258 {
259 int ret;
260 struct rpmhpd *peer = pd->peer;
261 unsigned int active_corner, sleep_corner;
262 unsigned int this_active_corner = 0, this_sleep_corner = 0;
263 unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
264
265 to_active_sleep(pd, corner, &this_active_corner, &this_sleep_corner);
266
267 if (peer && peer->enabled)
268 to_active_sleep(peer, peer->corner, &peer_active_corner,
269 &peer_sleep_corner);
270
271 active_corner = max(this_active_corner, peer_active_corner);
272
273 ret = rpmhpd_send_corner(pd, RPMH_ACTIVE_ONLY_STATE, active_corner,
274 active_corner > pd->active_corner);
275 if (ret)
276 return ret;
277
278 pd->active_corner = active_corner;
279
280 if (peer) {
281 peer->active_corner = active_corner;
282
283 ret = rpmhpd_send_corner(pd, RPMH_WAKE_ONLY_STATE,
284 active_corner, false);
285 if (ret)
286 return ret;
287
288 sleep_corner = max(this_sleep_corner, peer_sleep_corner);
289
290 return rpmhpd_send_corner(pd, RPMH_SLEEP_STATE, sleep_corner,
291 false);
292 }
293
294 return ret;
295 }
296
rpmhpd_power_on(struct generic_pm_domain * domain)297 static int rpmhpd_power_on(struct generic_pm_domain *domain)
298 {
299 struct rpmhpd *pd = domain_to_rpmhpd(domain);
300 unsigned int corner;
301 int ret;
302
303 mutex_lock(&rpmhpd_lock);
304
305 corner = max(pd->corner, pd->enable_corner);
306 ret = rpmhpd_aggregate_corner(pd, corner);
307 if (!ret)
308 pd->enabled = true;
309
310 mutex_unlock(&rpmhpd_lock);
311
312 return ret;
313 }
314
rpmhpd_power_off(struct generic_pm_domain * domain)315 static int rpmhpd_power_off(struct generic_pm_domain *domain)
316 {
317 struct rpmhpd *pd = domain_to_rpmhpd(domain);
318 int ret;
319
320 mutex_lock(&rpmhpd_lock);
321
322 ret = rpmhpd_aggregate_corner(pd, 0);
323 if (!ret)
324 pd->enabled = false;
325
326 mutex_unlock(&rpmhpd_lock);
327
328 return ret;
329 }
330
rpmhpd_set_performance_state(struct generic_pm_domain * domain,unsigned int level)331 static int rpmhpd_set_performance_state(struct generic_pm_domain *domain,
332 unsigned int level)
333 {
334 struct rpmhpd *pd = domain_to_rpmhpd(domain);
335 int ret = 0, i;
336
337 mutex_lock(&rpmhpd_lock);
338
339 for (i = 0; i < pd->level_count; i++)
340 if (level <= pd->level[i])
341 break;
342
343 /*
344 * If the level requested is more than that supported by the
345 * max corner, just set it to max anyway.
346 */
347 if (i == pd->level_count)
348 i--;
349
350 if (pd->enabled) {
351 /* Ensure that the domain isn't turn off */
352 if (i < pd->enable_corner)
353 i = pd->enable_corner;
354
355 ret = rpmhpd_aggregate_corner(pd, i);
356 if (ret)
357 goto out;
358 }
359
360 pd->corner = i;
361 out:
362 mutex_unlock(&rpmhpd_lock);
363
364 return ret;
365 }
366
rpmhpd_get_performance_state(struct generic_pm_domain * genpd,struct dev_pm_opp * opp)367 static unsigned int rpmhpd_get_performance_state(struct generic_pm_domain *genpd,
368 struct dev_pm_opp *opp)
369 {
370 return dev_pm_opp_get_level(opp);
371 }
372
rpmhpd_update_level_mapping(struct rpmhpd * rpmhpd)373 static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
374 {
375 int i;
376 const u16 *buf;
377
378 buf = cmd_db_read_aux_data(rpmhpd->res_name, &rpmhpd->level_count);
379 if (IS_ERR(buf))
380 return PTR_ERR(buf);
381
382 /* 2 bytes used for each command DB aux data entry */
383 rpmhpd->level_count >>= 1;
384
385 if (rpmhpd->level_count > RPMH_ARC_MAX_LEVELS)
386 return -EINVAL;
387
388 for (i = 0; i < rpmhpd->level_count; i++) {
389 rpmhpd->level[i] = buf[i];
390
391 /* Remember the first corner with non-zero level */
392 if (!rpmhpd->level[rpmhpd->enable_corner] && rpmhpd->level[i])
393 rpmhpd->enable_corner = i;
394
395 /*
396 * The AUX data may be zero padded. These 0 valued entries at
397 * the end of the map must be ignored.
398 */
399 if (i > 0 && rpmhpd->level[i] == 0) {
400 rpmhpd->level_count = i;
401 break;
402 }
403 pr_debug("%s: ARC hlvl=%2d --> vlvl=%4u\n", rpmhpd->res_name, i,
404 rpmhpd->level[i]);
405 }
406
407 return 0;
408 }
409
rpmhpd_probe(struct platform_device * pdev)410 static int rpmhpd_probe(struct platform_device *pdev)
411 {
412 int i, ret;
413 size_t num_pds;
414 struct device *dev = &pdev->dev;
415 struct genpd_onecell_data *data;
416 struct rpmhpd **rpmhpds;
417 const struct rpmhpd_desc *desc;
418
419 desc = of_device_get_match_data(dev);
420 if (!desc)
421 return -EINVAL;
422
423 rpmhpds = desc->rpmhpds;
424 num_pds = desc->num_pds;
425
426 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
427 if (!data)
428 return -ENOMEM;
429
430 data->domains = devm_kcalloc(dev, num_pds, sizeof(*data->domains),
431 GFP_KERNEL);
432 if (!data->domains)
433 return -ENOMEM;
434
435 data->num_domains = num_pds;
436
437 for (i = 0; i < num_pds; i++) {
438 if (!rpmhpds[i]) {
439 dev_warn(dev, "rpmhpds[%d] is empty\n", i);
440 continue;
441 }
442
443 rpmhpds[i]->dev = dev;
444 rpmhpds[i]->addr = cmd_db_read_addr(rpmhpds[i]->res_name);
445 if (!rpmhpds[i]->addr) {
446 dev_err(dev, "Could not find RPMh address for resource %s\n",
447 rpmhpds[i]->res_name);
448 return -ENODEV;
449 }
450
451 ret = cmd_db_read_slave_id(rpmhpds[i]->res_name);
452 if (ret != CMD_DB_HW_ARC) {
453 dev_err(dev, "RPMh slave ID mismatch\n");
454 return -EINVAL;
455 }
456
457 ret = rpmhpd_update_level_mapping(rpmhpds[i]);
458 if (ret)
459 return ret;
460
461 rpmhpds[i]->pd.power_off = rpmhpd_power_off;
462 rpmhpds[i]->pd.power_on = rpmhpd_power_on;
463 rpmhpds[i]->pd.set_performance_state = rpmhpd_set_performance_state;
464 rpmhpds[i]->pd.opp_to_performance_state = rpmhpd_get_performance_state;
465 pm_genpd_init(&rpmhpds[i]->pd, NULL, true);
466
467 data->domains[i] = &rpmhpds[i]->pd;
468 }
469
470 /* Add subdomains */
471 for (i = 0; i < num_pds; i++) {
472 if (!rpmhpds[i])
473 continue;
474 if (rpmhpds[i]->parent)
475 pm_genpd_add_subdomain(rpmhpds[i]->parent,
476 &rpmhpds[i]->pd);
477 }
478
479 return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
480 }
481
482 static struct platform_driver rpmhpd_driver = {
483 .driver = {
484 .name = "qcom-rpmhpd",
485 .of_match_table = rpmhpd_match_table,
486 .suppress_bind_attrs = true,
487 },
488 .probe = rpmhpd_probe,
489 };
490
rpmhpd_init(void)491 static int __init rpmhpd_init(void)
492 {
493 return platform_driver_register(&rpmhpd_driver);
494 }
495 core_initcall(rpmhpd_init);
496
497 MODULE_DESCRIPTION("Qualcomm Technologies, Inc. RPMh Power Domain Driver");
498 MODULE_LICENSE("GPL v2");
499