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34e93683 PC |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
f19d838d | 3 | * Ingenic SoCs TCU IRQ driver |
34e93683 | 4 | * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net> |
f19d838d | 5 | * Copyright (C) 2020 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com> |
34e93683 PC |
6 | */ |
7 | ||
8 | #include <linux/bitops.h> | |
9 | #include <linux/clk.h> | |
10 | #include <linux/clockchips.h> | |
11 | #include <linux/clocksource.h> | |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/mfd/ingenic-tcu.h> | |
14 | #include <linux/mfd/syscon.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_address.h> | |
17 | #include <linux/of_irq.h> | |
18 | #include <linux/of_platform.h> | |
f19d838d | 19 | #include <linux/overflow.h> |
34e93683 PC |
20 | #include <linux/platform_device.h> |
21 | #include <linux/regmap.h> | |
22 | #include <linux/sched_clock.h> | |
23 | ||
24 | #include <dt-bindings/clock/ingenic,tcu.h> | |
25 | ||
f19d838d ZY |
26 | static DEFINE_PER_CPU(call_single_data_t, ingenic_cevt_csd); |
27 | ||
34e93683 PC |
28 | struct ingenic_soc_info { |
29 | unsigned int num_channels; | |
30 | }; | |
31 | ||
f19d838d ZY |
32 | struct ingenic_tcu_timer { |
33 | unsigned int cpu; | |
34 | unsigned int channel; | |
35 | struct clock_event_device cevt; | |
36 | struct clk *clk; | |
37 | char name[8]; | |
38 | }; | |
39 | ||
34e93683 PC |
40 | struct ingenic_tcu { |
41 | struct regmap *map; | |
f19d838d ZY |
42 | struct device_node *np; |
43 | struct clk *cs_clk; | |
44 | unsigned int cs_channel; | |
34e93683 | 45 | struct clocksource cs; |
34e93683 | 46 | unsigned long pwm_channels_mask; |
f19d838d | 47 | struct ingenic_tcu_timer timers[]; |
34e93683 PC |
48 | }; |
49 | ||
50 | static struct ingenic_tcu *ingenic_tcu; | |
51 | ||
52 | static u64 notrace ingenic_tcu_timer_read(void) | |
53 | { | |
54 | struct ingenic_tcu *tcu = ingenic_tcu; | |
55 | unsigned int count; | |
56 | ||
57 | regmap_read(tcu->map, TCU_REG_TCNTc(tcu->cs_channel), &count); | |
58 | ||
59 | return count; | |
60 | } | |
61 | ||
62 | static u64 notrace ingenic_tcu_timer_cs_read(struct clocksource *cs) | |
63 | { | |
64 | return ingenic_tcu_timer_read(); | |
65 | } | |
66 | ||
f19d838d ZY |
67 | static inline struct ingenic_tcu * |
68 | to_ingenic_tcu(struct ingenic_tcu_timer *timer) | |
69 | { | |
70 | return container_of(timer, struct ingenic_tcu, timers[timer->cpu]); | |
71 | } | |
72 | ||
73 | static inline struct ingenic_tcu_timer * | |
74 | to_ingenic_tcu_timer(struct clock_event_device *evt) | |
34e93683 | 75 | { |
f19d838d | 76 | return container_of(evt, struct ingenic_tcu_timer, cevt); |
34e93683 PC |
77 | } |
78 | ||
79 | static int ingenic_tcu_cevt_set_state_shutdown(struct clock_event_device *evt) | |
80 | { | |
f19d838d ZY |
81 | struct ingenic_tcu_timer *timer = to_ingenic_tcu_timer(evt); |
82 | struct ingenic_tcu *tcu = to_ingenic_tcu(timer); | |
34e93683 | 83 | |
f19d838d | 84 | regmap_write(tcu->map, TCU_REG_TECR, BIT(timer->channel)); |
34e93683 PC |
85 | |
86 | return 0; | |
87 | } | |
88 | ||
89 | static int ingenic_tcu_cevt_set_next(unsigned long next, | |
90 | struct clock_event_device *evt) | |
91 | { | |
f19d838d ZY |
92 | struct ingenic_tcu_timer *timer = to_ingenic_tcu_timer(evt); |
93 | struct ingenic_tcu *tcu = to_ingenic_tcu(timer); | |
34e93683 PC |
94 | |
95 | if (next > 0xffff) | |
96 | return -EINVAL; | |
97 | ||
f19d838d ZY |
98 | regmap_write(tcu->map, TCU_REG_TDFRc(timer->channel), next); |
99 | regmap_write(tcu->map, TCU_REG_TCNTc(timer->channel), 0); | |
100 | regmap_write(tcu->map, TCU_REG_TESR, BIT(timer->channel)); | |
34e93683 PC |
101 | |
102 | return 0; | |
103 | } | |
104 | ||
f19d838d ZY |
105 | static void ingenic_per_cpu_event_handler(void *info) |
106 | { | |
107 | struct clock_event_device *cevt = (struct clock_event_device *) info; | |
108 | ||
109 | cevt->event_handler(cevt); | |
110 | } | |
111 | ||
34e93683 PC |
112 | static irqreturn_t ingenic_tcu_cevt_cb(int irq, void *dev_id) |
113 | { | |
f19d838d ZY |
114 | struct ingenic_tcu_timer *timer = dev_id; |
115 | struct ingenic_tcu *tcu = to_ingenic_tcu(timer); | |
116 | call_single_data_t *csd; | |
34e93683 | 117 | |
f19d838d | 118 | regmap_write(tcu->map, TCU_REG_TECR, BIT(timer->channel)); |
34e93683 | 119 | |
f19d838d ZY |
120 | if (timer->cevt.event_handler) { |
121 | csd = &per_cpu(ingenic_cevt_csd, timer->cpu); | |
122 | csd->info = (void *) &timer->cevt; | |
123 | csd->func = ingenic_per_cpu_event_handler; | |
124 | smp_call_function_single_async(timer->cpu, csd); | |
125 | } | |
34e93683 PC |
126 | |
127 | return IRQ_HANDLED; | |
128 | } | |
129 | ||
130 | static struct clk * __init ingenic_tcu_get_clock(struct device_node *np, int id) | |
131 | { | |
132 | struct of_phandle_args args; | |
133 | ||
134 | args.np = np; | |
135 | args.args_count = 1; | |
136 | args.args[0] = id; | |
137 | ||
138 | return of_clk_get_from_provider(&args); | |
139 | } | |
140 | ||
f19d838d | 141 | static int ingenic_tcu_setup_cevt(unsigned int cpu) |
34e93683 | 142 | { |
f19d838d ZY |
143 | struct ingenic_tcu *tcu = ingenic_tcu; |
144 | struct ingenic_tcu_timer *timer = &tcu->timers[cpu]; | |
145 | unsigned int timer_virq; | |
34e93683 PC |
146 | struct irq_domain *domain; |
147 | unsigned long rate; | |
148 | int err; | |
149 | ||
f19d838d ZY |
150 | timer->clk = ingenic_tcu_get_clock(tcu->np, timer->channel); |
151 | if (IS_ERR(timer->clk)) | |
152 | return PTR_ERR(timer->clk); | |
34e93683 | 153 | |
f19d838d | 154 | err = clk_prepare_enable(timer->clk); |
34e93683 PC |
155 | if (err) |
156 | goto err_clk_put; | |
157 | ||
f19d838d | 158 | rate = clk_get_rate(timer->clk); |
34e93683 PC |
159 | if (!rate) { |
160 | err = -EINVAL; | |
161 | goto err_clk_disable; | |
162 | } | |
163 | ||
f19d838d | 164 | domain = irq_find_host(tcu->np); |
34e93683 PC |
165 | if (!domain) { |
166 | err = -ENODEV; | |
167 | goto err_clk_disable; | |
168 | } | |
169 | ||
f19d838d | 170 | timer_virq = irq_create_mapping(domain, timer->channel); |
34e93683 PC |
171 | if (!timer_virq) { |
172 | err = -EINVAL; | |
173 | goto err_clk_disable; | |
174 | } | |
175 | ||
f19d838d | 176 | snprintf(timer->name, sizeof(timer->name), "TCU%u", timer->channel); |
34e93683 PC |
177 | |
178 | err = request_irq(timer_virq, ingenic_tcu_cevt_cb, IRQF_TIMER, | |
f19d838d | 179 | timer->name, timer); |
34e93683 PC |
180 | if (err) |
181 | goto err_irq_dispose_mapping; | |
182 | ||
f19d838d ZY |
183 | timer->cpu = smp_processor_id(); |
184 | timer->cevt.cpumask = cpumask_of(smp_processor_id()); | |
185 | timer->cevt.features = CLOCK_EVT_FEAT_ONESHOT; | |
186 | timer->cevt.name = timer->name; | |
187 | timer->cevt.rating = 200; | |
188 | timer->cevt.set_state_shutdown = ingenic_tcu_cevt_set_state_shutdown; | |
189 | timer->cevt.set_next_event = ingenic_tcu_cevt_set_next; | |
34e93683 | 190 | |
f19d838d | 191 | clockevents_config_and_register(&timer->cevt, rate, 10, 0xffff); |
34e93683 PC |
192 | |
193 | return 0; | |
194 | ||
195 | err_irq_dispose_mapping: | |
196 | irq_dispose_mapping(timer_virq); | |
197 | err_clk_disable: | |
f19d838d | 198 | clk_disable_unprepare(timer->clk); |
34e93683 | 199 | err_clk_put: |
f19d838d | 200 | clk_put(timer->clk); |
34e93683 PC |
201 | return err; |
202 | } | |
203 | ||
204 | static int __init ingenic_tcu_clocksource_init(struct device_node *np, | |
205 | struct ingenic_tcu *tcu) | |
206 | { | |
207 | unsigned int channel = tcu->cs_channel; | |
208 | struct clocksource *cs = &tcu->cs; | |
209 | unsigned long rate; | |
210 | int err; | |
211 | ||
212 | tcu->cs_clk = ingenic_tcu_get_clock(np, channel); | |
213 | if (IS_ERR(tcu->cs_clk)) | |
214 | return PTR_ERR(tcu->cs_clk); | |
215 | ||
216 | err = clk_prepare_enable(tcu->cs_clk); | |
217 | if (err) | |
218 | goto err_clk_put; | |
219 | ||
220 | rate = clk_get_rate(tcu->cs_clk); | |
221 | if (!rate) { | |
222 | err = -EINVAL; | |
223 | goto err_clk_disable; | |
224 | } | |
225 | ||
226 | /* Reset channel */ | |
227 | regmap_update_bits(tcu->map, TCU_REG_TCSRc(channel), | |
228 | 0xffff & ~TCU_TCSR_RESERVED_BITS, 0); | |
229 | ||
230 | /* Reset counter */ | |
231 | regmap_write(tcu->map, TCU_REG_TDFRc(channel), 0xffff); | |
232 | regmap_write(tcu->map, TCU_REG_TCNTc(channel), 0); | |
233 | ||
234 | /* Enable channel */ | |
235 | regmap_write(tcu->map, TCU_REG_TESR, BIT(channel)); | |
236 | ||
237 | cs->name = "ingenic-timer"; | |
238 | cs->rating = 200; | |
239 | cs->flags = CLOCK_SOURCE_IS_CONTINUOUS; | |
240 | cs->mask = CLOCKSOURCE_MASK(16); | |
241 | cs->read = ingenic_tcu_timer_cs_read; | |
242 | ||
243 | err = clocksource_register_hz(cs, rate); | |
244 | if (err) | |
245 | goto err_clk_disable; | |
246 | ||
247 | return 0; | |
248 | ||
249 | err_clk_disable: | |
250 | clk_disable_unprepare(tcu->cs_clk); | |
251 | err_clk_put: | |
252 | clk_put(tcu->cs_clk); | |
253 | return err; | |
254 | } | |
255 | ||
256 | static const struct ingenic_soc_info jz4740_soc_info = { | |
257 | .num_channels = 8, | |
258 | }; | |
259 | ||
260 | static const struct ingenic_soc_info jz4725b_soc_info = { | |
261 | .num_channels = 6, | |
262 | }; | |
263 | ||
264 | static const struct of_device_id ingenic_tcu_of_match[] = { | |
265 | { .compatible = "ingenic,jz4740-tcu", .data = &jz4740_soc_info, }, | |
266 | { .compatible = "ingenic,jz4725b-tcu", .data = &jz4725b_soc_info, }, | |
267 | { .compatible = "ingenic,jz4770-tcu", .data = &jz4740_soc_info, }, | |
a7cd3955 | 268 | { .compatible = "ingenic,x1000-tcu", .data = &jz4740_soc_info, }, |
34e93683 PC |
269 | { /* sentinel */ } |
270 | }; | |
271 | ||
272 | static int __init ingenic_tcu_init(struct device_node *np) | |
273 | { | |
274 | const struct of_device_id *id = of_match_node(ingenic_tcu_of_match, np); | |
275 | const struct ingenic_soc_info *soc_info = id->data; | |
f19d838d | 276 | struct ingenic_tcu_timer *timer; |
34e93683 PC |
277 | struct ingenic_tcu *tcu; |
278 | struct regmap *map; | |
f19d838d ZY |
279 | unsigned int cpu; |
280 | int ret, last_bit = -1; | |
34e93683 | 281 | long rate; |
34e93683 PC |
282 | |
283 | of_node_clear_flag(np, OF_POPULATED); | |
284 | ||
285 | map = device_node_to_regmap(np); | |
286 | if (IS_ERR(map)) | |
287 | return PTR_ERR(map); | |
288 | ||
f19d838d ZY |
289 | tcu = kzalloc(struct_size(tcu, timers, num_possible_cpus()), |
290 | GFP_KERNEL); | |
34e93683 PC |
291 | if (!tcu) |
292 | return -ENOMEM; | |
293 | ||
f19d838d ZY |
294 | /* |
295 | * Enable all TCU channels for PWM use by default except channels 0/1, | |
296 | * and channel 2 if target CPU is JZ4780/X2000 and SMP is selected. | |
297 | */ | |
298 | tcu->pwm_channels_mask = GENMASK(soc_info->num_channels - 1, | |
299 | num_possible_cpus() + 1); | |
34e93683 PC |
300 | of_property_read_u32(np, "ingenic,pwm-channels-mask", |
301 | (u32 *)&tcu->pwm_channels_mask); | |
302 | ||
f19d838d ZY |
303 | /* Verify that we have at least num_possible_cpus() + 1 free channels */ |
304 | if (hweight8(tcu->pwm_channels_mask) > | |
305 | soc_info->num_channels - num_possible_cpus() + 1) { | |
34e93683 PC |
306 | pr_crit("%s: Invalid PWM channel mask: 0x%02lx\n", __func__, |
307 | tcu->pwm_channels_mask); | |
308 | ret = -EINVAL; | |
309 | goto err_free_ingenic_tcu; | |
310 | } | |
311 | ||
312 | tcu->map = map; | |
f19d838d | 313 | tcu->np = np; |
34e93683 PC |
314 | ingenic_tcu = tcu; |
315 | ||
f19d838d ZY |
316 | for (cpu = 0; cpu < num_possible_cpus(); cpu++) { |
317 | timer = &tcu->timers[cpu]; | |
318 | ||
319 | timer->cpu = cpu; | |
320 | timer->channel = find_next_zero_bit(&tcu->pwm_channels_mask, | |
321 | soc_info->num_channels, | |
322 | last_bit + 1); | |
323 | last_bit = timer->channel; | |
324 | } | |
325 | ||
34e93683 PC |
326 | tcu->cs_channel = find_next_zero_bit(&tcu->pwm_channels_mask, |
327 | soc_info->num_channels, | |
f19d838d | 328 | last_bit + 1); |
34e93683 PC |
329 | |
330 | ret = ingenic_tcu_clocksource_init(np, tcu); | |
331 | if (ret) { | |
332 | pr_crit("%s: Unable to init clocksource: %d\n", __func__, ret); | |
333 | goto err_free_ingenic_tcu; | |
334 | } | |
335 | ||
f19d838d ZY |
336 | /* Setup clock events on each CPU core */ |
337 | ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "Ingenic XBurst: online", | |
338 | ingenic_tcu_setup_cevt, NULL); | |
339 | if (ret < 0) { | |
340 | pr_crit("%s: Unable to start CPU timers: %d\n", __func__, ret); | |
34e93683 | 341 | goto err_tcu_clocksource_cleanup; |
f19d838d | 342 | } |
34e93683 PC |
343 | |
344 | /* Register the sched_clock at the end as there's no way to undo it */ | |
345 | rate = clk_get_rate(tcu->cs_clk); | |
346 | sched_clock_register(ingenic_tcu_timer_read, 16, rate); | |
347 | ||
348 | return 0; | |
349 | ||
350 | err_tcu_clocksource_cleanup: | |
351 | clocksource_unregister(&tcu->cs); | |
352 | clk_disable_unprepare(tcu->cs_clk); | |
353 | clk_put(tcu->cs_clk); | |
354 | err_free_ingenic_tcu: | |
355 | kfree(tcu); | |
356 | return ret; | |
357 | } | |
358 | ||
359 | TIMER_OF_DECLARE(jz4740_tcu_intc, "ingenic,jz4740-tcu", ingenic_tcu_init); | |
360 | TIMER_OF_DECLARE(jz4725b_tcu_intc, "ingenic,jz4725b-tcu", ingenic_tcu_init); | |
361 | TIMER_OF_DECLARE(jz4770_tcu_intc, "ingenic,jz4770-tcu", ingenic_tcu_init); | |
a7cd3955 | 362 | TIMER_OF_DECLARE(x1000_tcu_intc, "ingenic,x1000-tcu", ingenic_tcu_init); |
34e93683 PC |
363 | |
364 | static int __init ingenic_tcu_probe(struct platform_device *pdev) | |
365 | { | |
366 | platform_set_drvdata(pdev, ingenic_tcu); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | static int __maybe_unused ingenic_tcu_suspend(struct device *dev) | |
372 | { | |
373 | struct ingenic_tcu *tcu = dev_get_drvdata(dev); | |
f19d838d | 374 | unsigned int cpu; |
34e93683 PC |
375 | |
376 | clk_disable(tcu->cs_clk); | |
f19d838d ZY |
377 | |
378 | for (cpu = 0; cpu < num_online_cpus(); cpu++) | |
379 | clk_disable(tcu->timers[cpu].clk); | |
380 | ||
34e93683 PC |
381 | return 0; |
382 | } | |
383 | ||
384 | static int __maybe_unused ingenic_tcu_resume(struct device *dev) | |
385 | { | |
386 | struct ingenic_tcu *tcu = dev_get_drvdata(dev); | |
f19d838d | 387 | unsigned int cpu; |
34e93683 PC |
388 | int ret; |
389 | ||
f19d838d ZY |
390 | for (cpu = 0; cpu < num_online_cpus(); cpu++) { |
391 | ret = clk_enable(tcu->timers[cpu].clk); | |
392 | if (ret) | |
393 | goto err_timer_clk_disable; | |
394 | } | |
34e93683 PC |
395 | |
396 | ret = clk_enable(tcu->cs_clk); | |
f19d838d ZY |
397 | if (ret) |
398 | goto err_timer_clk_disable; | |
34e93683 PC |
399 | |
400 | return 0; | |
f19d838d ZY |
401 | |
402 | err_timer_clk_disable: | |
403 | for (; cpu > 0; cpu--) | |
404 | clk_disable(tcu->timers[cpu - 1].clk); | |
405 | return ret; | |
34e93683 PC |
406 | } |
407 | ||
408 | static const struct dev_pm_ops __maybe_unused ingenic_tcu_pm_ops = { | |
409 | /* _noirq: We want the TCU clocks to be gated last / ungated first */ | |
410 | .suspend_noirq = ingenic_tcu_suspend, | |
411 | .resume_noirq = ingenic_tcu_resume, | |
412 | }; | |
413 | ||
414 | static struct platform_driver ingenic_tcu_driver = { | |
415 | .driver = { | |
416 | .name = "ingenic-tcu-timer", | |
417 | #ifdef CONFIG_PM_SLEEP | |
418 | .pm = &ingenic_tcu_pm_ops, | |
419 | #endif | |
420 | .of_match_table = ingenic_tcu_of_match, | |
421 | }, | |
422 | }; | |
423 | builtin_platform_driver_probe(ingenic_tcu_driver, ingenic_tcu_probe); |