1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2016, Linaro Limited
4 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
5 */
6
7 #include <linux/clk-provider.h>
8 #include <linux/err.h>
9 #include <linux/export.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/mutex.h>
14 #include <linux/mfd/qcom_rpm.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17
18 #include <dt-bindings/mfd/qcom-rpm.h>
19 #include <dt-bindings/clock/qcom,rpmcc.h>
20
21 #define QCOM_RPM_MISC_CLK_TYPE 0x306b6c63
22 #define QCOM_RPM_SCALING_ENABLE_ID 0x2
23 #define QCOM_RPM_XO_MODE_ON 0x2
24
25 static const struct clk_parent_data gcc_pxo[] = {
26 { .fw_name = "pxo", .name = "pxo_board" },
27 };
28
29 static const struct clk_parent_data gcc_cxo[] = {
30 { .fw_name = "cxo", .name = "cxo_board" },
31 };
32
33 #define DEFINE_CLK_RPM(_name, r_id) \
34 static struct clk_rpm clk_rpm_##_name##_a_clk; \
35 static struct clk_rpm clk_rpm_##_name##_clk = { \
36 .rpm_clk_id = (r_id), \
37 .peer = &clk_rpm_##_name##_a_clk, \
38 .rate = INT_MAX, \
39 .hw.init = &(struct clk_init_data){ \
40 .ops = &clk_rpm_ops, \
41 .name = #_name "_clk", \
42 .parent_data = gcc_pxo, \
43 .num_parents = ARRAY_SIZE(gcc_pxo), \
44 }, \
45 }; \
46 static struct clk_rpm clk_rpm_##_name##_a_clk = { \
47 .rpm_clk_id = (r_id), \
48 .peer = &clk_rpm_##_name##_clk, \
49 .active_only = true, \
50 .rate = INT_MAX, \
51 .hw.init = &(struct clk_init_data){ \
52 .ops = &clk_rpm_ops, \
53 .name = #_name "_a_clk", \
54 .parent_data = gcc_pxo, \
55 .num_parents = ARRAY_SIZE(gcc_pxo), \
56 }, \
57 }
58
59 #define DEFINE_CLK_RPM_XO_BUFFER(_name, offset) \
60 static struct clk_rpm clk_rpm_##_name##_clk = { \
61 .rpm_clk_id = QCOM_RPM_CXO_BUFFERS, \
62 .xo_offset = (offset), \
63 .hw.init = &(struct clk_init_data){ \
64 .ops = &clk_rpm_xo_ops, \
65 .name = #_name "_clk", \
66 .parent_data = gcc_cxo, \
67 .num_parents = ARRAY_SIZE(gcc_cxo), \
68 }, \
69 }
70
71 #define DEFINE_CLK_RPM_FIXED(_name, r_id, r) \
72 static struct clk_rpm clk_rpm_##_name##_clk = { \
73 .rpm_clk_id = (r_id), \
74 .rate = (r), \
75 .hw.init = &(struct clk_init_data){ \
76 .ops = &clk_rpm_fixed_ops, \
77 .name = #_name "_clk", \
78 .parent_data = gcc_pxo, \
79 .num_parents = ARRAY_SIZE(gcc_pxo), \
80 }, \
81 }
82
83 #define to_clk_rpm(_hw) container_of(_hw, struct clk_rpm, hw)
84
85 struct rpm_cc;
86
87 struct clk_rpm {
88 const int rpm_clk_id;
89 const int xo_offset;
90 const bool active_only;
91 unsigned long rate;
92 bool enabled;
93 bool branch;
94 struct clk_rpm *peer;
95 struct clk_hw hw;
96 struct qcom_rpm *rpm;
97 struct rpm_cc *rpm_cc;
98 };
99
100 struct rpm_cc {
101 struct qcom_rpm *rpm;
102 struct clk_rpm **clks;
103 size_t num_clks;
104 u32 xo_buffer_value;
105 struct mutex xo_lock;
106 };
107
108 struct rpm_clk_desc {
109 struct clk_rpm **clks;
110 size_t num_clks;
111 };
112
113 static DEFINE_MUTEX(rpm_clk_lock);
114
clk_rpm_handoff(struct clk_rpm * r)115 static int clk_rpm_handoff(struct clk_rpm *r)
116 {
117 int ret;
118 u32 value = INT_MAX;
119
120 /*
121 * The vendor tree simply reads the status for this
122 * RPM clock.
123 */
124 if (r->rpm_clk_id == QCOM_RPM_PLL_4 ||
125 r->rpm_clk_id == QCOM_RPM_CXO_BUFFERS)
126 return 0;
127
128 ret = qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE,
129 r->rpm_clk_id, &value, 1);
130 if (ret)
131 return ret;
132 ret = qcom_rpm_write(r->rpm, QCOM_RPM_SLEEP_STATE,
133 r->rpm_clk_id, &value, 1);
134 if (ret)
135 return ret;
136
137 return 0;
138 }
139
clk_rpm_set_rate_active(struct clk_rpm * r,unsigned long rate)140 static int clk_rpm_set_rate_active(struct clk_rpm *r, unsigned long rate)
141 {
142 u32 value = DIV_ROUND_UP(rate, 1000); /* to kHz */
143
144 return qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE,
145 r->rpm_clk_id, &value, 1);
146 }
147
clk_rpm_set_rate_sleep(struct clk_rpm * r,unsigned long rate)148 static int clk_rpm_set_rate_sleep(struct clk_rpm *r, unsigned long rate)
149 {
150 u32 value = DIV_ROUND_UP(rate, 1000); /* to kHz */
151
152 return qcom_rpm_write(r->rpm, QCOM_RPM_SLEEP_STATE,
153 r->rpm_clk_id, &value, 1);
154 }
155
to_active_sleep(struct clk_rpm * r,unsigned long rate,unsigned long * active,unsigned long * sleep)156 static void to_active_sleep(struct clk_rpm *r, unsigned long rate,
157 unsigned long *active, unsigned long *sleep)
158 {
159 *active = rate;
160
161 /*
162 * Active-only clocks don't care what the rate is during sleep. So,
163 * they vote for zero.
164 */
165 if (r->active_only)
166 *sleep = 0;
167 else
168 *sleep = *active;
169 }
170
clk_rpm_prepare(struct clk_hw * hw)171 static int clk_rpm_prepare(struct clk_hw *hw)
172 {
173 struct clk_rpm *r = to_clk_rpm(hw);
174 struct clk_rpm *peer = r->peer;
175 unsigned long this_rate = 0, this_sleep_rate = 0;
176 unsigned long peer_rate = 0, peer_sleep_rate = 0;
177 unsigned long active_rate, sleep_rate;
178 int ret = 0;
179
180 mutex_lock(&rpm_clk_lock);
181
182 /* Don't send requests to the RPM if the rate has not been set. */
183 if (!r->rate)
184 goto out;
185
186 to_active_sleep(r, r->rate, &this_rate, &this_sleep_rate);
187
188 /* Take peer clock's rate into account only if it's enabled. */
189 if (peer->enabled)
190 to_active_sleep(peer, peer->rate,
191 &peer_rate, &peer_sleep_rate);
192
193 active_rate = max(this_rate, peer_rate);
194
195 if (r->branch)
196 active_rate = !!active_rate;
197
198 ret = clk_rpm_set_rate_active(r, active_rate);
199 if (ret)
200 goto out;
201
202 sleep_rate = max(this_sleep_rate, peer_sleep_rate);
203 if (r->branch)
204 sleep_rate = !!sleep_rate;
205
206 ret = clk_rpm_set_rate_sleep(r, sleep_rate);
207 if (ret)
208 /* Undo the active set vote and restore it */
209 ret = clk_rpm_set_rate_active(r, peer_rate);
210
211 out:
212 if (!ret)
213 r->enabled = true;
214
215 mutex_unlock(&rpm_clk_lock);
216
217 return ret;
218 }
219
clk_rpm_unprepare(struct clk_hw * hw)220 static void clk_rpm_unprepare(struct clk_hw *hw)
221 {
222 struct clk_rpm *r = to_clk_rpm(hw);
223 struct clk_rpm *peer = r->peer;
224 unsigned long peer_rate = 0, peer_sleep_rate = 0;
225 unsigned long active_rate, sleep_rate;
226 int ret;
227
228 mutex_lock(&rpm_clk_lock);
229
230 if (!r->rate)
231 goto out;
232
233 /* Take peer clock's rate into account only if it's enabled. */
234 if (peer->enabled)
235 to_active_sleep(peer, peer->rate, &peer_rate,
236 &peer_sleep_rate);
237
238 active_rate = r->branch ? !!peer_rate : peer_rate;
239 ret = clk_rpm_set_rate_active(r, active_rate);
240 if (ret)
241 goto out;
242
243 sleep_rate = r->branch ? !!peer_sleep_rate : peer_sleep_rate;
244 ret = clk_rpm_set_rate_sleep(r, sleep_rate);
245 if (ret)
246 goto out;
247
248 r->enabled = false;
249
250 out:
251 mutex_unlock(&rpm_clk_lock);
252 }
253
clk_rpm_xo_prepare(struct clk_hw * hw)254 static int clk_rpm_xo_prepare(struct clk_hw *hw)
255 {
256 struct clk_rpm *r = to_clk_rpm(hw);
257 struct rpm_cc *rcc = r->rpm_cc;
258 int ret, clk_id = r->rpm_clk_id;
259 u32 value;
260
261 mutex_lock(&rcc->xo_lock);
262
263 value = rcc->xo_buffer_value | (QCOM_RPM_XO_MODE_ON << r->xo_offset);
264 ret = qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE, clk_id, &value, 1);
265 if (!ret) {
266 r->enabled = true;
267 rcc->xo_buffer_value = value;
268 }
269
270 mutex_unlock(&rcc->xo_lock);
271
272 return ret;
273 }
274
clk_rpm_xo_unprepare(struct clk_hw * hw)275 static void clk_rpm_xo_unprepare(struct clk_hw *hw)
276 {
277 struct clk_rpm *r = to_clk_rpm(hw);
278 struct rpm_cc *rcc = r->rpm_cc;
279 int ret, clk_id = r->rpm_clk_id;
280 u32 value;
281
282 mutex_lock(&rcc->xo_lock);
283
284 value = rcc->xo_buffer_value & ~(QCOM_RPM_XO_MODE_ON << r->xo_offset);
285 ret = qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE, clk_id, &value, 1);
286 if (!ret) {
287 r->enabled = false;
288 rcc->xo_buffer_value = value;
289 }
290
291 mutex_unlock(&rcc->xo_lock);
292 }
293
clk_rpm_fixed_prepare(struct clk_hw * hw)294 static int clk_rpm_fixed_prepare(struct clk_hw *hw)
295 {
296 struct clk_rpm *r = to_clk_rpm(hw);
297 u32 value = 1;
298 int ret;
299
300 ret = qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE,
301 r->rpm_clk_id, &value, 1);
302 if (!ret)
303 r->enabled = true;
304
305 return ret;
306 }
307
clk_rpm_fixed_unprepare(struct clk_hw * hw)308 static void clk_rpm_fixed_unprepare(struct clk_hw *hw)
309 {
310 struct clk_rpm *r = to_clk_rpm(hw);
311 u32 value = 0;
312 int ret;
313
314 ret = qcom_rpm_write(r->rpm, QCOM_RPM_ACTIVE_STATE,
315 r->rpm_clk_id, &value, 1);
316 if (!ret)
317 r->enabled = false;
318 }
319
clk_rpm_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)320 static int clk_rpm_set_rate(struct clk_hw *hw,
321 unsigned long rate, unsigned long parent_rate)
322 {
323 struct clk_rpm *r = to_clk_rpm(hw);
324 struct clk_rpm *peer = r->peer;
325 unsigned long active_rate, sleep_rate;
326 unsigned long this_rate = 0, this_sleep_rate = 0;
327 unsigned long peer_rate = 0, peer_sleep_rate = 0;
328 int ret = 0;
329
330 mutex_lock(&rpm_clk_lock);
331
332 if (!r->enabled)
333 goto out;
334
335 to_active_sleep(r, rate, &this_rate, &this_sleep_rate);
336
337 /* Take peer clock's rate into account only if it's enabled. */
338 if (peer->enabled)
339 to_active_sleep(peer, peer->rate,
340 &peer_rate, &peer_sleep_rate);
341
342 active_rate = max(this_rate, peer_rate);
343 ret = clk_rpm_set_rate_active(r, active_rate);
344 if (ret)
345 goto out;
346
347 sleep_rate = max(this_sleep_rate, peer_sleep_rate);
348 ret = clk_rpm_set_rate_sleep(r, sleep_rate);
349 if (ret)
350 goto out;
351
352 r->rate = rate;
353
354 out:
355 mutex_unlock(&rpm_clk_lock);
356
357 return ret;
358 }
359
clk_rpm_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * parent_rate)360 static long clk_rpm_round_rate(struct clk_hw *hw, unsigned long rate,
361 unsigned long *parent_rate)
362 {
363 /*
364 * RPM handles rate rounding and we don't have a way to
365 * know what the rate will be, so just return whatever
366 * rate is requested.
367 */
368 return rate;
369 }
370
clk_rpm_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)371 static unsigned long clk_rpm_recalc_rate(struct clk_hw *hw,
372 unsigned long parent_rate)
373 {
374 struct clk_rpm *r = to_clk_rpm(hw);
375
376 /*
377 * RPM handles rate rounding and we don't have a way to
378 * know what the rate will be, so just return whatever
379 * rate was set.
380 */
381 return r->rate;
382 }
383
384 static const struct clk_ops clk_rpm_xo_ops = {
385 .prepare = clk_rpm_xo_prepare,
386 .unprepare = clk_rpm_xo_unprepare,
387 };
388
389 static const struct clk_ops clk_rpm_fixed_ops = {
390 .prepare = clk_rpm_fixed_prepare,
391 .unprepare = clk_rpm_fixed_unprepare,
392 .round_rate = clk_rpm_round_rate,
393 .recalc_rate = clk_rpm_recalc_rate,
394 };
395
396 static const struct clk_ops clk_rpm_ops = {
397 .prepare = clk_rpm_prepare,
398 .unprepare = clk_rpm_unprepare,
399 .set_rate = clk_rpm_set_rate,
400 .round_rate = clk_rpm_round_rate,
401 .recalc_rate = clk_rpm_recalc_rate,
402 };
403
404 DEFINE_CLK_RPM(afab, QCOM_RPM_APPS_FABRIC_CLK);
405 DEFINE_CLK_RPM(sfab, QCOM_RPM_SYS_FABRIC_CLK);
406 DEFINE_CLK_RPM(mmfab, QCOM_RPM_MM_FABRIC_CLK);
407 DEFINE_CLK_RPM(daytona, QCOM_RPM_DAYTONA_FABRIC_CLK);
408 DEFINE_CLK_RPM(sfpb, QCOM_RPM_SFPB_CLK);
409 DEFINE_CLK_RPM(cfpb, QCOM_RPM_CFPB_CLK);
410 DEFINE_CLK_RPM(mmfpb, QCOM_RPM_MMFPB_CLK);
411 DEFINE_CLK_RPM(smi, QCOM_RPM_SMI_CLK);
412 DEFINE_CLK_RPM(ebi1, QCOM_RPM_EBI1_CLK);
413
414 DEFINE_CLK_RPM(qdss, QCOM_RPM_QDSS_CLK);
415 DEFINE_CLK_RPM(nss_fabric_0, QCOM_RPM_NSS_FABRIC_0_CLK);
416 DEFINE_CLK_RPM(nss_fabric_1, QCOM_RPM_NSS_FABRIC_1_CLK);
417
418 DEFINE_CLK_RPM_FIXED(pll4, QCOM_RPM_PLL_4, 540672000);
419
420 DEFINE_CLK_RPM_XO_BUFFER(xo_d0, 0);
421 DEFINE_CLK_RPM_XO_BUFFER(xo_d1, 8);
422 DEFINE_CLK_RPM_XO_BUFFER(xo_a0, 16);
423 DEFINE_CLK_RPM_XO_BUFFER(xo_a1, 24);
424 DEFINE_CLK_RPM_XO_BUFFER(xo_a2, 28);
425
426 static struct clk_rpm *msm8660_clks[] = {
427 [RPM_APPS_FABRIC_CLK] = &clk_rpm_afab_clk,
428 [RPM_APPS_FABRIC_A_CLK] = &clk_rpm_afab_a_clk,
429 [RPM_SYS_FABRIC_CLK] = &clk_rpm_sfab_clk,
430 [RPM_SYS_FABRIC_A_CLK] = &clk_rpm_sfab_a_clk,
431 [RPM_MM_FABRIC_CLK] = &clk_rpm_mmfab_clk,
432 [RPM_MM_FABRIC_A_CLK] = &clk_rpm_mmfab_a_clk,
433 [RPM_DAYTONA_FABRIC_CLK] = &clk_rpm_daytona_clk,
434 [RPM_DAYTONA_FABRIC_A_CLK] = &clk_rpm_daytona_a_clk,
435 [RPM_SFPB_CLK] = &clk_rpm_sfpb_clk,
436 [RPM_SFPB_A_CLK] = &clk_rpm_sfpb_a_clk,
437 [RPM_CFPB_CLK] = &clk_rpm_cfpb_clk,
438 [RPM_CFPB_A_CLK] = &clk_rpm_cfpb_a_clk,
439 [RPM_MMFPB_CLK] = &clk_rpm_mmfpb_clk,
440 [RPM_MMFPB_A_CLK] = &clk_rpm_mmfpb_a_clk,
441 [RPM_SMI_CLK] = &clk_rpm_smi_clk,
442 [RPM_SMI_A_CLK] = &clk_rpm_smi_a_clk,
443 [RPM_EBI1_CLK] = &clk_rpm_ebi1_clk,
444 [RPM_EBI1_A_CLK] = &clk_rpm_ebi1_a_clk,
445 [RPM_PLL4_CLK] = &clk_rpm_pll4_clk,
446 };
447
448 static const struct rpm_clk_desc rpm_clk_msm8660 = {
449 .clks = msm8660_clks,
450 .num_clks = ARRAY_SIZE(msm8660_clks),
451 };
452
453 static struct clk_rpm *apq8064_clks[] = {
454 [RPM_APPS_FABRIC_CLK] = &clk_rpm_afab_clk,
455 [RPM_APPS_FABRIC_A_CLK] = &clk_rpm_afab_a_clk,
456 [RPM_CFPB_CLK] = &clk_rpm_cfpb_clk,
457 [RPM_CFPB_A_CLK] = &clk_rpm_cfpb_a_clk,
458 [RPM_DAYTONA_FABRIC_CLK] = &clk_rpm_daytona_clk,
459 [RPM_DAYTONA_FABRIC_A_CLK] = &clk_rpm_daytona_a_clk,
460 [RPM_EBI1_CLK] = &clk_rpm_ebi1_clk,
461 [RPM_EBI1_A_CLK] = &clk_rpm_ebi1_a_clk,
462 [RPM_MM_FABRIC_CLK] = &clk_rpm_mmfab_clk,
463 [RPM_MM_FABRIC_A_CLK] = &clk_rpm_mmfab_a_clk,
464 [RPM_MMFPB_CLK] = &clk_rpm_mmfpb_clk,
465 [RPM_MMFPB_A_CLK] = &clk_rpm_mmfpb_a_clk,
466 [RPM_SYS_FABRIC_CLK] = &clk_rpm_sfab_clk,
467 [RPM_SYS_FABRIC_A_CLK] = &clk_rpm_sfab_a_clk,
468 [RPM_SFPB_CLK] = &clk_rpm_sfpb_clk,
469 [RPM_SFPB_A_CLK] = &clk_rpm_sfpb_a_clk,
470 [RPM_QDSS_CLK] = &clk_rpm_qdss_clk,
471 [RPM_QDSS_A_CLK] = &clk_rpm_qdss_a_clk,
472 [RPM_XO_D0] = &clk_rpm_xo_d0_clk,
473 [RPM_XO_D1] = &clk_rpm_xo_d1_clk,
474 [RPM_XO_A0] = &clk_rpm_xo_a0_clk,
475 [RPM_XO_A1] = &clk_rpm_xo_a1_clk,
476 [RPM_XO_A2] = &clk_rpm_xo_a2_clk,
477 };
478
479 static const struct rpm_clk_desc rpm_clk_apq8064 = {
480 .clks = apq8064_clks,
481 .num_clks = ARRAY_SIZE(apq8064_clks),
482 };
483
484 static struct clk_rpm *ipq806x_clks[] = {
485 [RPM_APPS_FABRIC_CLK] = &clk_rpm_afab_clk,
486 [RPM_APPS_FABRIC_A_CLK] = &clk_rpm_afab_a_clk,
487 [RPM_CFPB_CLK] = &clk_rpm_cfpb_clk,
488 [RPM_CFPB_A_CLK] = &clk_rpm_cfpb_a_clk,
489 [RPM_DAYTONA_FABRIC_CLK] = &clk_rpm_daytona_clk,
490 [RPM_DAYTONA_FABRIC_A_CLK] = &clk_rpm_daytona_a_clk,
491 [RPM_EBI1_CLK] = &clk_rpm_ebi1_clk,
492 [RPM_EBI1_A_CLK] = &clk_rpm_ebi1_a_clk,
493 [RPM_SYS_FABRIC_CLK] = &clk_rpm_sfab_clk,
494 [RPM_SYS_FABRIC_A_CLK] = &clk_rpm_sfab_a_clk,
495 [RPM_SFPB_CLK] = &clk_rpm_sfpb_clk,
496 [RPM_SFPB_A_CLK] = &clk_rpm_sfpb_a_clk,
497 [RPM_NSS_FABRIC_0_CLK] = &clk_rpm_nss_fabric_0_clk,
498 [RPM_NSS_FABRIC_0_A_CLK] = &clk_rpm_nss_fabric_0_a_clk,
499 [RPM_NSS_FABRIC_1_CLK] = &clk_rpm_nss_fabric_1_clk,
500 [RPM_NSS_FABRIC_1_A_CLK] = &clk_rpm_nss_fabric_1_a_clk,
501 };
502
503 static const struct rpm_clk_desc rpm_clk_ipq806x = {
504 .clks = ipq806x_clks,
505 .num_clks = ARRAY_SIZE(ipq806x_clks),
506 };
507
508 static const struct of_device_id rpm_clk_match_table[] = {
509 { .compatible = "qcom,rpmcc-msm8660", .data = &rpm_clk_msm8660 },
510 { .compatible = "qcom,rpmcc-apq8060", .data = &rpm_clk_msm8660 },
511 { .compatible = "qcom,rpmcc-apq8064", .data = &rpm_clk_apq8064 },
512 { .compatible = "qcom,rpmcc-ipq806x", .data = &rpm_clk_ipq806x },
513 { }
514 };
515 MODULE_DEVICE_TABLE(of, rpm_clk_match_table);
516
qcom_rpm_clk_hw_get(struct of_phandle_args * clkspec,void * data)517 static struct clk_hw *qcom_rpm_clk_hw_get(struct of_phandle_args *clkspec,
518 void *data)
519 {
520 struct rpm_cc *rcc = data;
521 unsigned int idx = clkspec->args[0];
522
523 if (idx >= rcc->num_clks) {
524 pr_err("%s: invalid index %u\n", __func__, idx);
525 return ERR_PTR(-EINVAL);
526 }
527
528 return rcc->clks[idx] ? &rcc->clks[idx]->hw : ERR_PTR(-ENOENT);
529 }
530
rpm_clk_probe(struct platform_device * pdev)531 static int rpm_clk_probe(struct platform_device *pdev)
532 {
533 struct rpm_cc *rcc;
534 int ret;
535 size_t num_clks, i;
536 struct qcom_rpm *rpm;
537 struct clk_rpm **rpm_clks;
538 const struct rpm_clk_desc *desc;
539
540 rpm = dev_get_drvdata(pdev->dev.parent);
541 if (!rpm) {
542 dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n");
543 return -ENODEV;
544 }
545
546 desc = of_device_get_match_data(&pdev->dev);
547 if (!desc)
548 return -EINVAL;
549
550 rpm_clks = desc->clks;
551 num_clks = desc->num_clks;
552
553 rcc = devm_kzalloc(&pdev->dev, sizeof(*rcc), GFP_KERNEL);
554 if (!rcc)
555 return -ENOMEM;
556
557 rcc->clks = rpm_clks;
558 rcc->num_clks = num_clks;
559 mutex_init(&rcc->xo_lock);
560
561 for (i = 0; i < num_clks; i++) {
562 if (!rpm_clks[i])
563 continue;
564
565 rpm_clks[i]->rpm = rpm;
566 rpm_clks[i]->rpm_cc = rcc;
567
568 ret = clk_rpm_handoff(rpm_clks[i]);
569 if (ret)
570 goto err;
571 }
572
573 for (i = 0; i < num_clks; i++) {
574 if (!rpm_clks[i])
575 continue;
576
577 ret = devm_clk_hw_register(&pdev->dev, &rpm_clks[i]->hw);
578 if (ret)
579 goto err;
580 }
581
582 ret = devm_of_clk_add_hw_provider(&pdev->dev, qcom_rpm_clk_hw_get,
583 rcc);
584 if (ret)
585 goto err;
586
587 return 0;
588 err:
589 dev_err(&pdev->dev, "Error registering RPM Clock driver (%d)\n", ret);
590 return ret;
591 }
592
593 static struct platform_driver rpm_clk_driver = {
594 .driver = {
595 .name = "qcom-clk-rpm",
596 .of_match_table = rpm_clk_match_table,
597 },
598 .probe = rpm_clk_probe,
599 };
600
rpm_clk_init(void)601 static int __init rpm_clk_init(void)
602 {
603 return platform_driver_register(&rpm_clk_driver);
604 }
605 core_initcall(rpm_clk_init);
606
rpm_clk_exit(void)607 static void __exit rpm_clk_exit(void)
608 {
609 platform_driver_unregister(&rpm_clk_driver);
610 }
611 module_exit(rpm_clk_exit);
612
613 MODULE_DESCRIPTION("Qualcomm RPM Clock Controller Driver");
614 MODULE_LICENSE("GPL v2");
615 MODULE_ALIAS("platform:qcom-clk-rpm");
616