tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2017-2018, 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/mutex.h>
8#include <linux/pm_domain.h>
9#include <linux/of.h>
10#include <linux/of_device.h>
11#include <linux/platform_device.h>
12#include <linux/pm_opp.h>
13#include <linux/soc/qcom/smd-rpm.h>
14
15#include <dt-bindings/power/qcom-rpmpd.h>
16
17#define domain_to_rpmpd(domain) container_of(domain, struct rpmpd, pd)
18
19/* Resource types:
20 * RPMPD_X is X encoded as a little-endian, lower-case, ASCII string */
21#define RPMPD_SMPA 0x61706d73
22#define RPMPD_LDOA 0x616f646c
23#define RPMPD_RWCX 0x78637772
24#define RPMPD_RWMX 0x786d7772
25#define RPMPD_RWLC 0x636c7772
26#define RPMPD_RWLM 0x6d6c7772
27#define RPMPD_RWSC 0x63737772
28#define RPMPD_RWSM 0x6d737772
29
30/* Operation Keys */
31#define KEY_CORNER 0x6e726f63 /* corn */
32#define KEY_ENABLE 0x6e657773 /* swen */
33#define KEY_FLOOR_CORNER 0x636676 /* vfc */
34#define KEY_FLOOR_LEVEL 0x6c6676 /* vfl */
35#define KEY_LEVEL 0x6c766c76 /* vlvl */
36
37#define MAX_8996_RPMPD_STATE 6
38
39#define DEFINE_RPMPD_PAIR(_platform, _name, _active, r_type, r_key, \
40 r_id) \
41 static struct rpmpd _platform##_##_active; \
42 static struct rpmpd _platform##_##_name = { \
43 .pd = { .name = #_name, }, \
44 .peer = &_platform##_##_active, \
45 .res_type = RPMPD_##r_type, \
46 .res_id = r_id, \
47 .key = KEY_##r_key, \
48 }; \
49 static struct rpmpd _platform##_##_active = { \
50 .pd = { .name = #_active, }, \
51 .peer = &_platform##_##_name, \
52 .active_only = true, \
53 .res_type = RPMPD_##r_type, \
54 .res_id = r_id, \
55 .key = KEY_##r_key, \
56 }
57
58#define DEFINE_RPMPD_CORNER(_platform, _name, r_type, r_id) \
59 static struct rpmpd _platform##_##_name = { \
60 .pd = { .name = #_name, }, \
61 .res_type = RPMPD_##r_type, \
62 .res_id = r_id, \
63 .key = KEY_CORNER, \
64 }
65
66#define DEFINE_RPMPD_LEVEL(_platform, _name, r_type, r_id) \
67 static struct rpmpd _platform##_##_name = { \
68 .pd = { .name = #_name, }, \
69 .res_type = RPMPD_##r_type, \
70 .res_id = r_id, \
71 .key = KEY_LEVEL, \
72 }
73
74#define DEFINE_RPMPD_VFC(_platform, _name, r_type, r_id) \
75 static struct rpmpd _platform##_##_name = { \
76 .pd = { .name = #_name, }, \
77 .res_type = RPMPD_##r_type, \
78 .res_id = r_id, \
79 .key = KEY_FLOOR_CORNER, \
80 }
81
82#define DEFINE_RPMPD_VFL(_platform, _name, r_type, r_id) \
83 static struct rpmpd _platform##_##_name = { \
84 .pd = { .name = #_name, }, \
85 .res_type = RPMPD_##r_type, \
86 .res_id = r_id, \
87 .key = KEY_FLOOR_LEVEL, \
88 }
89
90struct rpmpd_req {
91 __le32 key;
92 __le32 nbytes;
93 __le32 value;
94};
95
96struct rpmpd {
97 struct generic_pm_domain pd;
98 struct rpmpd *peer;
99 const bool active_only;
100 unsigned int corner;
101 bool enabled;
102 const char *res_name;
103 const int res_type;
104 const int res_id;
105 struct qcom_smd_rpm *rpm;
106 unsigned int max_state;
107 __le32 key;
108};
109
110struct rpmpd_desc {
111 struct rpmpd **rpmpds;
112 size_t num_pds;
113 unsigned int max_state;
114};
115
116static DEFINE_MUTEX(rpmpd_lock);
117
118/* msm8996 RPM Power domains */
119DEFINE_RPMPD_PAIR(msm8996, vddcx, vddcx_ao, SMPA, CORNER, 1);
120DEFINE_RPMPD_PAIR(msm8996, vddmx, vddmx_ao, SMPA, CORNER, 2);
121DEFINE_RPMPD_CORNER(msm8996, vddsscx, LDOA, 26);
122
123DEFINE_RPMPD_VFC(msm8996, vddcx_vfc, SMPA, 1);
124DEFINE_RPMPD_VFC(msm8996, vddsscx_vfc, LDOA, 26);
125
126static struct rpmpd *msm8996_rpmpds[] = {
127 [MSM8996_VDDCX] = &msm8996_vddcx,
128 [MSM8996_VDDCX_AO] = &msm8996_vddcx_ao,
129 [MSM8996_VDDCX_VFC] = &msm8996_vddcx_vfc,
130 [MSM8996_VDDMX] = &msm8996_vddmx,
131 [MSM8996_VDDMX_AO] = &msm8996_vddmx_ao,
132 [MSM8996_VDDSSCX] = &msm8996_vddsscx,
133 [MSM8996_VDDSSCX_VFC] = &msm8996_vddsscx_vfc,
134};
135
136static const struct rpmpd_desc msm8996_desc = {
137 .rpmpds = msm8996_rpmpds,
138 .num_pds = ARRAY_SIZE(msm8996_rpmpds),
139 .max_state = MAX_8996_RPMPD_STATE,
140};
141
142/* msm8998 RPM Power domains */
143DEFINE_RPMPD_PAIR(msm8998, vddcx, vddcx_ao, RWCX, LEVEL, 0);
144DEFINE_RPMPD_VFL(msm8998, vddcx_vfl, RWCX, 0);
145
146DEFINE_RPMPD_PAIR(msm8998, vddmx, vddmx_ao, RWMX, LEVEL, 0);
147DEFINE_RPMPD_VFL(msm8998, vddmx_vfl, RWMX, 0);
148
149DEFINE_RPMPD_LEVEL(msm8998, vdd_ssccx, RWSC, 0);
150DEFINE_RPMPD_VFL(msm8998, vdd_ssccx_vfl, RWSC, 0);
151
152DEFINE_RPMPD_LEVEL(msm8998, vdd_sscmx, RWSM, 0);
153DEFINE_RPMPD_VFL(msm8998, vdd_sscmx_vfl, RWSM, 0);
154
155static struct rpmpd *msm8998_rpmpds[] = {
156 [MSM8998_VDDCX] = &msm8998_vddcx,
157 [MSM8998_VDDCX_AO] = &msm8998_vddcx_ao,
158 [MSM8998_VDDCX_VFL] = &msm8998_vddcx_vfl,
159 [MSM8998_VDDMX] = &msm8998_vddmx,
160 [MSM8998_VDDMX_AO] = &msm8998_vddmx_ao,
161 [MSM8998_VDDMX_VFL] = &msm8998_vddmx_vfl,
162 [MSM8998_SSCCX] = &msm8998_vdd_ssccx,
163 [MSM8998_SSCCX_VFL] = &msm8998_vdd_ssccx_vfl,
164 [MSM8998_SSCMX] = &msm8998_vdd_sscmx,
165 [MSM8998_SSCMX_VFL] = &msm8998_vdd_sscmx_vfl,
166};
167
168static const struct rpmpd_desc msm8998_desc = {
169 .rpmpds = msm8998_rpmpds,
170 .num_pds = ARRAY_SIZE(msm8998_rpmpds),
171 .max_state = RPM_SMD_LEVEL_BINNING,
172};
173
174/* qcs404 RPM Power domains */
175DEFINE_RPMPD_PAIR(qcs404, vddmx, vddmx_ao, RWMX, LEVEL, 0);
176DEFINE_RPMPD_VFL(qcs404, vddmx_vfl, RWMX, 0);
177
178DEFINE_RPMPD_LEVEL(qcs404, vdd_lpicx, RWLC, 0);
179DEFINE_RPMPD_VFL(qcs404, vdd_lpicx_vfl, RWLC, 0);
180
181DEFINE_RPMPD_LEVEL(qcs404, vdd_lpimx, RWLM, 0);
182DEFINE_RPMPD_VFL(qcs404, vdd_lpimx_vfl, RWLM, 0);
183
184static struct rpmpd *qcs404_rpmpds[] = {
185 [QCS404_VDDMX] = &qcs404_vddmx,
186 [QCS404_VDDMX_AO] = &qcs404_vddmx_ao,
187 [QCS404_VDDMX_VFL] = &qcs404_vddmx_vfl,
188 [QCS404_LPICX] = &qcs404_vdd_lpicx,
189 [QCS404_LPICX_VFL] = &qcs404_vdd_lpicx_vfl,
190 [QCS404_LPIMX] = &qcs404_vdd_lpimx,
191 [QCS404_LPIMX_VFL] = &qcs404_vdd_lpimx_vfl,
192};
193
194static const struct rpmpd_desc qcs404_desc = {
195 .rpmpds = qcs404_rpmpds,
196 .num_pds = ARRAY_SIZE(qcs404_rpmpds),
197 .max_state = RPM_SMD_LEVEL_BINNING,
198};
199
200static const struct of_device_id rpmpd_match_table[] = {
201 { .compatible = "qcom,msm8996-rpmpd", .data = &msm8996_desc },
202 { .compatible = "qcom,msm8998-rpmpd", .data = &msm8998_desc },
203 { .compatible = "qcom,qcs404-rpmpd", .data = &qcs404_desc },
204 { }
205};
206
207static int rpmpd_send_enable(struct rpmpd *pd, bool enable)
208{
209 struct rpmpd_req req = {
210 .key = KEY_ENABLE,
211 .nbytes = cpu_to_le32(sizeof(u32)),
212 .value = cpu_to_le32(enable),
213 };
214
215 return qcom_rpm_smd_write(pd->rpm, QCOM_SMD_RPM_ACTIVE_STATE,
216 pd->res_type, pd->res_id, &req, sizeof(req));
217}
218
219static int rpmpd_send_corner(struct rpmpd *pd, int state, unsigned int corner)
220{
221 struct rpmpd_req req = {
222 .key = pd->key,
223 .nbytes = cpu_to_le32(sizeof(u32)),
224 .value = cpu_to_le32(corner),
225 };
226
227 return qcom_rpm_smd_write(pd->rpm, state, pd->res_type, pd->res_id,
228 &req, sizeof(req));
229};
230
231static void to_active_sleep(struct rpmpd *pd, unsigned int corner,
232 unsigned int *active, unsigned int *sleep)
233{
234 *active = corner;
235
236 if (pd->active_only)
237 *sleep = 0;
238 else
239 *sleep = *active;
240}
241
242static int rpmpd_aggregate_corner(struct rpmpd *pd)
243{
244 int ret;
245 struct rpmpd *peer = pd->peer;
246 unsigned int active_corner, sleep_corner;
247 unsigned int this_active_corner = 0, this_sleep_corner = 0;
248 unsigned int peer_active_corner = 0, peer_sleep_corner = 0;
249
250 to_active_sleep(pd, pd->corner, &this_active_corner, &this_sleep_corner);
251
252 if (peer && peer->enabled)
253 to_active_sleep(peer, peer->corner, &peer_active_corner,
254 &peer_sleep_corner);
255
256 active_corner = max(this_active_corner, peer_active_corner);
257
258 ret = rpmpd_send_corner(pd, QCOM_SMD_RPM_ACTIVE_STATE, active_corner);
259 if (ret)
260 return ret;
261
262 sleep_corner = max(this_sleep_corner, peer_sleep_corner);
263
264 return rpmpd_send_corner(pd, QCOM_SMD_RPM_SLEEP_STATE, sleep_corner);
265}
266
267static int rpmpd_power_on(struct generic_pm_domain *domain)
268{
269 int ret;
270 struct rpmpd *pd = domain_to_rpmpd(domain);
271
272 mutex_lock(&rpmpd_lock);
273
274 ret = rpmpd_send_enable(pd, true);
275 if (ret)
276 goto out;
277
278 pd->enabled = true;
279
280 if (pd->corner)
281 ret = rpmpd_aggregate_corner(pd);
282
283out:
284 mutex_unlock(&rpmpd_lock);
285
286 return ret;
287}
288
289static int rpmpd_power_off(struct generic_pm_domain *domain)
290{
291 int ret;
292 struct rpmpd *pd = domain_to_rpmpd(domain);
293
294 mutex_lock(&rpmpd_lock);
295
296 ret = rpmpd_send_enable(pd, false);
297 if (!ret)
298 pd->enabled = false;
299
300 mutex_unlock(&rpmpd_lock);
301
302 return ret;
303}
304
305static int rpmpd_set_performance(struct generic_pm_domain *domain,
306 unsigned int state)
307{
308 int ret = 0;
309 struct rpmpd *pd = domain_to_rpmpd(domain);
310
311 if (state > pd->max_state)
312 state = pd->max_state;
313
314 mutex_lock(&rpmpd_lock);
315
316 pd->corner = state;
317
318 /* Always send updates for vfc and vfl */
319 if (!pd->enabled && pd->key != KEY_FLOOR_CORNER &&
320 pd->key != KEY_FLOOR_LEVEL)
321 goto out;
322
323 ret = rpmpd_aggregate_corner(pd);
324
325out:
326 mutex_unlock(&rpmpd_lock);
327
328 return ret;
329}
330
331static unsigned int rpmpd_get_performance(struct generic_pm_domain *genpd,
332 struct dev_pm_opp *opp)
333{
334 return dev_pm_opp_get_level(opp);
335}
336
337static int rpmpd_probe(struct platform_device *pdev)
338{
339 int i;
340 size_t num;
341 struct genpd_onecell_data *data;
342 struct qcom_smd_rpm *rpm;
343 struct rpmpd **rpmpds;
344 const struct rpmpd_desc *desc;
345
346 rpm = dev_get_drvdata(pdev->dev.parent);
347 if (!rpm) {
348 dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n");
349 return -ENODEV;
350 }
351
352 desc = of_device_get_match_data(&pdev->dev);
353 if (!desc)
354 return -EINVAL;
355
356 rpmpds = desc->rpmpds;
357 num = desc->num_pds;
358
359 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
360 if (!data)
361 return -ENOMEM;
362
363 data->domains = devm_kcalloc(&pdev->dev, num, sizeof(*data->domains),
364 GFP_KERNEL);
365 data->num_domains = num;
366
367 for (i = 0; i < num; i++) {
368 if (!rpmpds[i]) {
369 dev_warn(&pdev->dev, "rpmpds[] with empty entry at index=%d\n",
370 i);
371 continue;
372 }
373
374 rpmpds[i]->rpm = rpm;
375 rpmpds[i]->max_state = desc->max_state;
376 rpmpds[i]->pd.power_off = rpmpd_power_off;
377 rpmpds[i]->pd.power_on = rpmpd_power_on;
378 rpmpds[i]->pd.set_performance_state = rpmpd_set_performance;
379 rpmpds[i]->pd.opp_to_performance_state = rpmpd_get_performance;
380 pm_genpd_init(&rpmpds[i]->pd, NULL, true);
381
382 data->domains[i] = &rpmpds[i]->pd;
383 }
384
385 return of_genpd_add_provider_onecell(pdev->dev.of_node, data);
386}
387
388static struct platform_driver rpmpd_driver = {
389 .driver = {
390 .name = "qcom-rpmpd",
391 .of_match_table = rpmpd_match_table,
392 .suppress_bind_attrs = true,
393 },
394 .probe = rpmpd_probe,
395};
396
397static int __init rpmpd_init(void)
398{
399 return platform_driver_register(&rpmpd_driver);
400}
401core_initcall(rpmpd_init);