1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
4 */
5
6 #include <linux/bitfield.h>
7 #include <linux/clk-provider.h>
8 #include <linux/cpufreq.h>
9 #include <linux/init.h>
10 #include <linux/interconnect.h>
11 #include <linux/interrupt.h>
12 #include <linux/io.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_opp.h>
18 #include <linux/slab.h>
19 #include <linux/spinlock.h>
20 #include <linux/units.h>
21
22 #define LUT_MAX_ENTRIES 40U
23 #define LUT_SRC GENMASK(31, 30)
24 #define LUT_L_VAL GENMASK(7, 0)
25 #define LUT_CORE_COUNT GENMASK(18, 16)
26 #define LUT_VOLT GENMASK(11, 0)
27 #define CLK_HW_DIV 2
28 #define LUT_TURBO_IND 1
29
30 #define GT_IRQ_STATUS BIT(2)
31
32 #define MAX_FREQ_DOMAINS 4
33
34 struct qcom_cpufreq_soc_data {
35 u32 reg_enable;
36 u32 reg_domain_state;
37 u32 reg_dcvs_ctrl;
38 u32 reg_freq_lut;
39 u32 reg_volt_lut;
40 u32 reg_intr_clr;
41 u32 reg_current_vote;
42 u32 reg_perf_state;
43 u8 lut_row_size;
44 };
45
46 struct qcom_cpufreq_data {
47 void __iomem *base;
48
49 /*
50 * Mutex to synchronize between de-init sequence and re-starting LMh
51 * polling/interrupts
52 */
53 struct mutex throttle_lock;
54 int throttle_irq;
55 char irq_name[15];
56 bool cancel_throttle;
57 struct delayed_work throttle_work;
58 struct cpufreq_policy *policy;
59 struct clk_hw cpu_clk;
60
61 bool per_core_dcvs;
62 };
63
64 static struct {
65 struct qcom_cpufreq_data *data;
66 const struct qcom_cpufreq_soc_data *soc_data;
67 } qcom_cpufreq;
68
69 static unsigned long cpu_hw_rate, xo_rate;
70 static bool icc_scaling_enabled;
71
qcom_cpufreq_set_bw(struct cpufreq_policy * policy,unsigned long freq_khz)72 static int qcom_cpufreq_set_bw(struct cpufreq_policy *policy,
73 unsigned long freq_khz)
74 {
75 unsigned long freq_hz = freq_khz * 1000;
76 struct dev_pm_opp *opp;
77 struct device *dev;
78 int ret;
79
80 dev = get_cpu_device(policy->cpu);
81 if (!dev)
82 return -ENODEV;
83
84 opp = dev_pm_opp_find_freq_exact(dev, freq_hz, true);
85 if (IS_ERR(opp))
86 return PTR_ERR(opp);
87
88 ret = dev_pm_opp_set_opp(dev, opp);
89 dev_pm_opp_put(opp);
90 return ret;
91 }
92
qcom_cpufreq_update_opp(struct device * cpu_dev,unsigned long freq_khz,unsigned long volt)93 static int qcom_cpufreq_update_opp(struct device *cpu_dev,
94 unsigned long freq_khz,
95 unsigned long volt)
96 {
97 unsigned long freq_hz = freq_khz * 1000;
98 int ret;
99
100 /* Skip voltage update if the opp table is not available */
101 if (!icc_scaling_enabled)
102 return dev_pm_opp_add(cpu_dev, freq_hz, volt);
103
104 ret = dev_pm_opp_adjust_voltage(cpu_dev, freq_hz, volt, volt, volt);
105 if (ret) {
106 dev_err(cpu_dev, "Voltage update failed freq=%ld\n", freq_khz);
107 return ret;
108 }
109
110 return dev_pm_opp_enable(cpu_dev, freq_hz);
111 }
112
qcom_cpufreq_hw_target_index(struct cpufreq_policy * policy,unsigned int index)113 static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy,
114 unsigned int index)
115 {
116 struct qcom_cpufreq_data *data = policy->driver_data;
117 const struct qcom_cpufreq_soc_data *soc_data = qcom_cpufreq.soc_data;
118 unsigned long freq = policy->freq_table[index].frequency;
119 unsigned int i;
120
121 writel_relaxed(index, data->base + soc_data->reg_perf_state);
122
123 if (data->per_core_dcvs)
124 for (i = 1; i < cpumask_weight(policy->related_cpus); i++)
125 writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4);
126
127 if (icc_scaling_enabled)
128 qcom_cpufreq_set_bw(policy, freq);
129
130 return 0;
131 }
132
qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data * data)133 static unsigned long qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data)
134 {
135 unsigned int lval;
136
137 if (qcom_cpufreq.soc_data->reg_current_vote)
138 lval = readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_current_vote) & 0x3ff;
139 else
140 lval = readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_domain_state) & 0xff;
141
142 return lval * xo_rate;
143 }
144
145 /* Get the frequency requested by the cpufreq core for the CPU */
qcom_cpufreq_get_freq(unsigned int cpu)146 static unsigned int qcom_cpufreq_get_freq(unsigned int cpu)
147 {
148 struct qcom_cpufreq_data *data;
149 const struct qcom_cpufreq_soc_data *soc_data;
150 struct cpufreq_policy *policy;
151 unsigned int index;
152
153 policy = cpufreq_cpu_get_raw(cpu);
154 if (!policy)
155 return 0;
156
157 data = policy->driver_data;
158 soc_data = qcom_cpufreq.soc_data;
159
160 index = readl_relaxed(data->base + soc_data->reg_perf_state);
161 index = min(index, LUT_MAX_ENTRIES - 1);
162
163 return policy->freq_table[index].frequency;
164 }
165
qcom_cpufreq_hw_get(unsigned int cpu)166 static unsigned int qcom_cpufreq_hw_get(unsigned int cpu)
167 {
168 struct qcom_cpufreq_data *data;
169 struct cpufreq_policy *policy;
170
171 policy = cpufreq_cpu_get_raw(cpu);
172 if (!policy)
173 return 0;
174
175 data = policy->driver_data;
176
177 if (data->throttle_irq >= 0)
178 return qcom_lmh_get_throttle_freq(data) / HZ_PER_KHZ;
179
180 return qcom_cpufreq_get_freq(cpu);
181 }
182
qcom_cpufreq_hw_fast_switch(struct cpufreq_policy * policy,unsigned int target_freq)183 static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
184 unsigned int target_freq)
185 {
186 struct qcom_cpufreq_data *data = policy->driver_data;
187 const struct qcom_cpufreq_soc_data *soc_data = qcom_cpufreq.soc_data;
188 unsigned int index;
189 unsigned int i;
190
191 index = policy->cached_resolved_idx;
192 writel_relaxed(index, data->base + soc_data->reg_perf_state);
193
194 if (data->per_core_dcvs)
195 for (i = 1; i < cpumask_weight(policy->related_cpus); i++)
196 writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4);
197
198 return policy->freq_table[index].frequency;
199 }
200
qcom_cpufreq_hw_read_lut(struct device * cpu_dev,struct cpufreq_policy * policy)201 static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
202 struct cpufreq_policy *policy)
203 {
204 u32 data, src, lval, i, core_count, prev_freq = 0, freq;
205 u32 volt;
206 struct cpufreq_frequency_table *table;
207 struct dev_pm_opp *opp;
208 unsigned long rate;
209 int ret;
210 struct qcom_cpufreq_data *drv_data = policy->driver_data;
211 const struct qcom_cpufreq_soc_data *soc_data = qcom_cpufreq.soc_data;
212
213 table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL);
214 if (!table)
215 return -ENOMEM;
216
217 ret = dev_pm_opp_of_add_table(cpu_dev);
218 if (!ret) {
219 /* Disable all opps and cross-validate against LUT later */
220 icc_scaling_enabled = true;
221 for (rate = 0; ; rate++) {
222 opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
223 if (IS_ERR(opp))
224 break;
225
226 dev_pm_opp_put(opp);
227 dev_pm_opp_disable(cpu_dev, rate);
228 }
229 } else if (ret != -ENODEV) {
230 dev_err(cpu_dev, "Invalid opp table in device tree\n");
231 kfree(table);
232 return ret;
233 } else {
234 policy->fast_switch_possible = true;
235 icc_scaling_enabled = false;
236 }
237
238 for (i = 0; i < LUT_MAX_ENTRIES; i++) {
239 data = readl_relaxed(drv_data->base + soc_data->reg_freq_lut +
240 i * soc_data->lut_row_size);
241 src = FIELD_GET(LUT_SRC, data);
242 lval = FIELD_GET(LUT_L_VAL, data);
243 core_count = FIELD_GET(LUT_CORE_COUNT, data);
244
245 data = readl_relaxed(drv_data->base + soc_data->reg_volt_lut +
246 i * soc_data->lut_row_size);
247 volt = FIELD_GET(LUT_VOLT, data) * 1000;
248
249 if (src)
250 freq = xo_rate * lval / 1000;
251 else
252 freq = cpu_hw_rate / 1000;
253
254 if (freq != prev_freq && core_count != LUT_TURBO_IND) {
255 if (!qcom_cpufreq_update_opp(cpu_dev, freq, volt)) {
256 table[i].frequency = freq;
257 dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i,
258 freq, core_count);
259 } else {
260 dev_warn(cpu_dev, "failed to update OPP for freq=%d\n", freq);
261 table[i].frequency = CPUFREQ_ENTRY_INVALID;
262 }
263
264 } else if (core_count == LUT_TURBO_IND) {
265 table[i].frequency = CPUFREQ_ENTRY_INVALID;
266 }
267
268 /*
269 * Two of the same frequencies with the same core counts means
270 * end of table
271 */
272 if (i > 0 && prev_freq == freq) {
273 struct cpufreq_frequency_table *prev = &table[i - 1];
274
275 /*
276 * Only treat the last frequency that might be a boost
277 * as the boost frequency
278 */
279 if (prev->frequency == CPUFREQ_ENTRY_INVALID) {
280 if (!qcom_cpufreq_update_opp(cpu_dev, prev_freq, volt)) {
281 prev->frequency = prev_freq;
282 prev->flags = CPUFREQ_BOOST_FREQ;
283 } else {
284 dev_warn(cpu_dev, "failed to update OPP for freq=%d\n",
285 freq);
286 }
287 }
288
289 break;
290 }
291
292 prev_freq = freq;
293 }
294
295 table[i].frequency = CPUFREQ_TABLE_END;
296 policy->freq_table = table;
297 dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
298
299 return 0;
300 }
301
qcom_get_related_cpus(int index,struct cpumask * m)302 static void qcom_get_related_cpus(int index, struct cpumask *m)
303 {
304 struct device_node *cpu_np;
305 struct of_phandle_args args;
306 int cpu, ret;
307
308 for_each_possible_cpu(cpu) {
309 cpu_np = of_cpu_device_node_get(cpu);
310 if (!cpu_np)
311 continue;
312
313 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
314 "#freq-domain-cells", 0,
315 &args);
316 of_node_put(cpu_np);
317 if (ret < 0)
318 continue;
319
320 if (index == args.args[0])
321 cpumask_set_cpu(cpu, m);
322 }
323 }
324
qcom_lmh_dcvs_notify(struct qcom_cpufreq_data * data)325 static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
326 {
327 struct cpufreq_policy *policy = data->policy;
328 int cpu = cpumask_first(policy->related_cpus);
329 struct device *dev = get_cpu_device(cpu);
330 unsigned long freq_hz, throttled_freq;
331 struct dev_pm_opp *opp;
332
333 /*
334 * Get the h/w throttled frequency, normalize it using the
335 * registered opp table and use it to calculate thermal pressure.
336 */
337 freq_hz = qcom_lmh_get_throttle_freq(data);
338
339 opp = dev_pm_opp_find_freq_floor(dev, &freq_hz);
340 if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE)
341 opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz);
342
343 if (IS_ERR(opp)) {
344 dev_warn(dev, "Can't find the OPP for throttling: %pe!\n", opp);
345 } else {
346 dev_pm_opp_put(opp);
347 }
348
349 throttled_freq = freq_hz / HZ_PER_KHZ;
350
351 /* Update HW pressure (the boost frequencies are accepted) */
352 arch_update_hw_pressure(policy->related_cpus, throttled_freq);
353
354 /*
355 * In the unlikely case policy is unregistered do not enable
356 * polling or h/w interrupt
357 */
358 mutex_lock(&data->throttle_lock);
359 if (data->cancel_throttle)
360 goto out;
361
362 /*
363 * If h/w throttled frequency is higher than what cpufreq has requested
364 * for, then stop polling and switch back to interrupt mechanism.
365 */
366 if (throttled_freq >= qcom_cpufreq_get_freq(cpu))
367 enable_irq(data->throttle_irq);
368 else
369 mod_delayed_work(system_highpri_wq, &data->throttle_work,
370 msecs_to_jiffies(10));
371
372 out:
373 mutex_unlock(&data->throttle_lock);
374 }
375
qcom_lmh_dcvs_poll(struct work_struct * work)376 static void qcom_lmh_dcvs_poll(struct work_struct *work)
377 {
378 struct qcom_cpufreq_data *data;
379
380 data = container_of(work, struct qcom_cpufreq_data, throttle_work.work);
381 qcom_lmh_dcvs_notify(data);
382 }
383
qcom_lmh_dcvs_handle_irq(int irq,void * data)384 static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data)
385 {
386 struct qcom_cpufreq_data *c_data = data;
387
388 /* Disable interrupt and enable polling */
389 disable_irq_nosync(c_data->throttle_irq);
390 schedule_delayed_work(&c_data->throttle_work, 0);
391
392 if (qcom_cpufreq.soc_data->reg_intr_clr)
393 writel_relaxed(GT_IRQ_STATUS,
394 c_data->base + qcom_cpufreq.soc_data->reg_intr_clr);
395
396 return IRQ_HANDLED;
397 }
398
399 static const struct qcom_cpufreq_soc_data qcom_soc_data = {
400 .reg_enable = 0x0,
401 .reg_dcvs_ctrl = 0xbc,
402 .reg_freq_lut = 0x110,
403 .reg_volt_lut = 0x114,
404 .reg_current_vote = 0x704,
405 .reg_perf_state = 0x920,
406 .lut_row_size = 32,
407 };
408
409 static const struct qcom_cpufreq_soc_data epss_soc_data = {
410 .reg_enable = 0x0,
411 .reg_domain_state = 0x20,
412 .reg_dcvs_ctrl = 0xb0,
413 .reg_freq_lut = 0x100,
414 .reg_volt_lut = 0x200,
415 .reg_intr_clr = 0x308,
416 .reg_perf_state = 0x320,
417 .lut_row_size = 4,
418 };
419
420 static const struct of_device_id qcom_cpufreq_hw_match[] = {
421 { .compatible = "qcom,cpufreq-hw", .data = &qcom_soc_data },
422 { .compatible = "qcom,cpufreq-epss", .data = &epss_soc_data },
423 {}
424 };
425 MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match);
426
qcom_cpufreq_hw_lmh_init(struct cpufreq_policy * policy,int index)427 static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index)
428 {
429 struct qcom_cpufreq_data *data = policy->driver_data;
430 struct platform_device *pdev = cpufreq_get_driver_data();
431 int ret;
432
433 /*
434 * Look for LMh interrupt. If no interrupt line is specified /
435 * if there is an error, allow cpufreq to be enabled as usual.
436 */
437 data->throttle_irq = platform_get_irq_optional(pdev, index);
438 if (data->throttle_irq == -ENXIO)
439 return 0;
440 if (data->throttle_irq < 0)
441 return data->throttle_irq;
442
443 data->cancel_throttle = false;
444 data->policy = policy;
445
446 mutex_init(&data->throttle_lock);
447 INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll);
448
449 snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu);
450 ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq,
451 IRQF_ONESHOT | IRQF_NO_AUTOEN, data->irq_name, data);
452 if (ret) {
453 dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret);
454 return 0;
455 }
456
457 ret = irq_set_affinity_and_hint(data->throttle_irq, policy->cpus);
458 if (ret)
459 dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n",
460 data->irq_name, data->throttle_irq);
461
462 return 0;
463 }
464
qcom_cpufreq_hw_cpu_online(struct cpufreq_policy * policy)465 static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy)
466 {
467 struct qcom_cpufreq_data *data = policy->driver_data;
468 struct platform_device *pdev = cpufreq_get_driver_data();
469 int ret;
470
471 if (data->throttle_irq <= 0)
472 return 0;
473
474 mutex_lock(&data->throttle_lock);
475 data->cancel_throttle = false;
476 mutex_unlock(&data->throttle_lock);
477
478 ret = irq_set_affinity_and_hint(data->throttle_irq, policy->cpus);
479 if (ret)
480 dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n",
481 data->irq_name, data->throttle_irq);
482
483 return ret;
484 }
485
qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy * policy)486 static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy)
487 {
488 struct qcom_cpufreq_data *data = policy->driver_data;
489
490 if (data->throttle_irq <= 0)
491 return 0;
492
493 mutex_lock(&data->throttle_lock);
494 data->cancel_throttle = true;
495 mutex_unlock(&data->throttle_lock);
496
497 cancel_delayed_work_sync(&data->throttle_work);
498 irq_set_affinity_and_hint(data->throttle_irq, NULL);
499 disable_irq_nosync(data->throttle_irq);
500
501 return 0;
502 }
503
qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data * data)504 static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data)
505 {
506 if (data->throttle_irq <= 0)
507 return;
508
509 free_irq(data->throttle_irq, data);
510 }
511
qcom_cpufreq_hw_cpu_init(struct cpufreq_policy * policy)512 static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
513 {
514 struct platform_device *pdev = cpufreq_get_driver_data();
515 struct device *dev = &pdev->dev;
516 struct of_phandle_args args;
517 struct device_node *cpu_np;
518 struct device *cpu_dev;
519 struct qcom_cpufreq_data *data;
520 int ret, index;
521
522 cpu_dev = get_cpu_device(policy->cpu);
523 if (!cpu_dev) {
524 pr_err("%s: failed to get cpu%d device\n", __func__,
525 policy->cpu);
526 return -ENODEV;
527 }
528
529 cpu_np = of_cpu_device_node_get(policy->cpu);
530 if (!cpu_np)
531 return -EINVAL;
532
533 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
534 "#freq-domain-cells", 0, &args);
535 of_node_put(cpu_np);
536 if (ret)
537 return ret;
538
539 index = args.args[0];
540 data = &qcom_cpufreq.data[index];
541
542 /* HW should be in enabled state to proceed */
543 if (!(readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_enable) & 0x1)) {
544 dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index);
545 return -ENODEV;
546 }
547
548 if (readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_dcvs_ctrl) & 0x1)
549 data->per_core_dcvs = true;
550
551 qcom_get_related_cpus(index, policy->cpus);
552
553 policy->driver_data = data;
554 policy->dvfs_possible_from_any_cpu = true;
555
556 ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy);
557 if (ret) {
558 dev_err(dev, "Domain-%d failed to read LUT\n", index);
559 return ret;
560 }
561
562 ret = dev_pm_opp_get_opp_count(cpu_dev);
563 if (ret <= 0) {
564 dev_err(cpu_dev, "Failed to add OPPs\n");
565 return -ENODEV;
566 }
567
568 if (policy_has_boost_freq(policy)) {
569 ret = cpufreq_enable_boost_support();
570 if (ret)
571 dev_warn(cpu_dev, "failed to enable boost: %d\n", ret);
572 }
573
574 return qcom_cpufreq_hw_lmh_init(policy, index);
575 }
576
qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy * policy)577 static void qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
578 {
579 struct device *cpu_dev = get_cpu_device(policy->cpu);
580 struct qcom_cpufreq_data *data = policy->driver_data;
581
582 dev_pm_opp_remove_all_dynamic(cpu_dev);
583 dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
584 qcom_cpufreq_hw_lmh_exit(data);
585 kfree(policy->freq_table);
586 kfree(data);
587 }
588
qcom_cpufreq_ready(struct cpufreq_policy * policy)589 static void qcom_cpufreq_ready(struct cpufreq_policy *policy)
590 {
591 struct qcom_cpufreq_data *data = policy->driver_data;
592
593 if (data->throttle_irq >= 0)
594 enable_irq(data->throttle_irq);
595 }
596
597 static struct freq_attr *qcom_cpufreq_hw_attr[] = {
598 &cpufreq_freq_attr_scaling_available_freqs,
599 &cpufreq_freq_attr_scaling_boost_freqs,
600 NULL
601 };
602
603 static struct cpufreq_driver cpufreq_qcom_hw_driver = {
604 .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
605 CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
606 CPUFREQ_IS_COOLING_DEV,
607 .verify = cpufreq_generic_frequency_table_verify,
608 .target_index = qcom_cpufreq_hw_target_index,
609 .get = qcom_cpufreq_hw_get,
610 .init = qcom_cpufreq_hw_cpu_init,
611 .exit = qcom_cpufreq_hw_cpu_exit,
612 .online = qcom_cpufreq_hw_cpu_online,
613 .offline = qcom_cpufreq_hw_cpu_offline,
614 .register_em = cpufreq_register_em_with_opp,
615 .fast_switch = qcom_cpufreq_hw_fast_switch,
616 .name = "qcom-cpufreq-hw",
617 .attr = qcom_cpufreq_hw_attr,
618 .ready = qcom_cpufreq_ready,
619 };
620
qcom_cpufreq_hw_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)621 static unsigned long qcom_cpufreq_hw_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
622 {
623 struct qcom_cpufreq_data *data = container_of(hw, struct qcom_cpufreq_data, cpu_clk);
624
625 return qcom_lmh_get_throttle_freq(data);
626 }
627
628 static const struct clk_ops qcom_cpufreq_hw_clk_ops = {
629 .recalc_rate = qcom_cpufreq_hw_recalc_rate,
630 };
631
qcom_cpufreq_hw_driver_probe(struct platform_device * pdev)632 static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
633 {
634 struct clk_hw_onecell_data *clk_data;
635 struct device *dev = &pdev->dev;
636 struct device *cpu_dev;
637 struct clk *clk;
638 int ret, i, num_domains;
639
640 clk = clk_get(dev, "xo");
641 if (IS_ERR(clk))
642 return PTR_ERR(clk);
643
644 xo_rate = clk_get_rate(clk);
645 clk_put(clk);
646
647 clk = clk_get(dev, "alternate");
648 if (IS_ERR(clk))
649 return PTR_ERR(clk);
650
651 cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
652 clk_put(clk);
653
654 cpufreq_qcom_hw_driver.driver_data = pdev;
655
656 /* Check for optional interconnect paths on CPU0 */
657 cpu_dev = get_cpu_device(0);
658 if (!cpu_dev)
659 return -EPROBE_DEFER;
660
661 ret = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL);
662 if (ret)
663 return dev_err_probe(dev, ret, "Failed to find icc paths\n");
664
665 for (num_domains = 0; num_domains < MAX_FREQ_DOMAINS; num_domains++)
666 if (!platform_get_resource(pdev, IORESOURCE_MEM, num_domains))
667 break;
668
669 qcom_cpufreq.data = devm_kzalloc(dev, sizeof(struct qcom_cpufreq_data) * num_domains,
670 GFP_KERNEL);
671 if (!qcom_cpufreq.data)
672 return -ENOMEM;
673
674 qcom_cpufreq.soc_data = of_device_get_match_data(dev);
675 if (!qcom_cpufreq.soc_data)
676 return -ENODEV;
677
678 clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, num_domains), GFP_KERNEL);
679 if (!clk_data)
680 return -ENOMEM;
681
682 clk_data->num = num_domains;
683
684 for (i = 0; i < num_domains; i++) {
685 struct qcom_cpufreq_data *data = &qcom_cpufreq.data[i];
686 struct clk_init_data clk_init = {};
687 void __iomem *base;
688
689 base = devm_platform_ioremap_resource(pdev, i);
690 if (IS_ERR(base)) {
691 dev_err(dev, "Failed to map resource index %d\n", i);
692 return PTR_ERR(base);
693 }
694
695 data->base = base;
696
697 /* Register CPU clock for each frequency domain */
698 clk_init.name = kasprintf(GFP_KERNEL, "qcom_cpufreq%d", i);
699 if (!clk_init.name)
700 return -ENOMEM;
701
702 clk_init.flags = CLK_GET_RATE_NOCACHE;
703 clk_init.ops = &qcom_cpufreq_hw_clk_ops;
704 data->cpu_clk.init = &clk_init;
705
706 ret = devm_clk_hw_register(dev, &data->cpu_clk);
707 if (ret < 0) {
708 dev_err(dev, "Failed to register clock %d: %d\n", i, ret);
709 kfree(clk_init.name);
710 return ret;
711 }
712
713 clk_data->hws[i] = &data->cpu_clk;
714 kfree(clk_init.name);
715 }
716
717 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data);
718 if (ret < 0) {
719 dev_err(dev, "Failed to add clock provider\n");
720 return ret;
721 }
722
723 ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver);
724 if (ret)
725 dev_err(dev, "CPUFreq HW driver failed to register\n");
726 else
727 dev_dbg(dev, "QCOM CPUFreq HW driver initialized\n");
728
729 return ret;
730 }
731
qcom_cpufreq_hw_driver_remove(struct platform_device * pdev)732 static void qcom_cpufreq_hw_driver_remove(struct platform_device *pdev)
733 {
734 cpufreq_unregister_driver(&cpufreq_qcom_hw_driver);
735 }
736
737 static struct platform_driver qcom_cpufreq_hw_driver = {
738 .probe = qcom_cpufreq_hw_driver_probe,
739 .remove_new = qcom_cpufreq_hw_driver_remove,
740 .driver = {
741 .name = "qcom-cpufreq-hw",
742 .of_match_table = qcom_cpufreq_hw_match,
743 },
744 };
745
qcom_cpufreq_hw_init(void)746 static int __init qcom_cpufreq_hw_init(void)
747 {
748 return platform_driver_register(&qcom_cpufreq_hw_driver);
749 }
750 postcore_initcall(qcom_cpufreq_hw_init);
751
qcom_cpufreq_hw_exit(void)752 static void __exit qcom_cpufreq_hw_exit(void)
753 {
754 platform_driver_unregister(&qcom_cpufreq_hw_driver);
755 }
756 module_exit(qcom_cpufreq_hw_exit);
757
758 MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver");
759 MODULE_LICENSE("GPL v2");
760