1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * This file contains driver for the Cadence Triple Timer Counter Rev 06 |
4 | * |
5 | * Copyright (C) 2011-2013 Xilinx |
6 | * |
7 | * based on arch/mips/kernel/time.c timer driver |
8 | */ |
9 | |
10 | #include <linux/clk.h> |
11 | #include <linux/interrupt.h> |
12 | #include <linux/clockchips.h> |
13 | #include <linux/clocksource.h> |
14 | #include <linux/of_address.h> |
15 | #include <linux/of_irq.h> |
16 | #include <linux/platform_device.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/sched_clock.h> |
19 | #include <linux/module.h> |
20 | #include <linux/of_platform.h> |
21 | |
22 | /* |
23 | * This driver configures the 2 16/32-bit count-up timers as follows: |
24 | * |
25 | * T1: Timer 1, clocksource for generic timekeeping |
26 | * T2: Timer 2, clockevent source for hrtimers |
27 | * T3: Timer 3, <unused> |
28 | * |
29 | * The input frequency to the timer module for emulation is 2.5MHz which is |
30 | * common to all the timer channels (T1, T2, and T3). With a pre-scaler of 32, |
31 | * the timers are clocked at 78.125KHz (12.8 us resolution). |
32 | |
33 | * The input frequency to the timer module in silicon is configurable and |
34 | * obtained from device tree. The pre-scaler of 32 is used. |
35 | */ |
36 | |
37 | /* |
38 | * Timer Register Offset Definitions of Timer 1, Increment base address by 4 |
39 | * and use same offsets for Timer 2 |
40 | */ |
41 | #define TTC_CLK_CNTRL_OFFSET 0x00 /* Clock Control Reg, RW */ |
42 | #define TTC_CNT_CNTRL_OFFSET 0x0C /* Counter Control Reg, RW */ |
43 | #define TTC_COUNT_VAL_OFFSET 0x18 /* Counter Value Reg, RO */ |
44 | #define TTC_INTR_VAL_OFFSET 0x24 /* Interval Count Reg, RW */ |
45 | #define TTC_ISR_OFFSET 0x54 /* Interrupt Status Reg, RO */ |
46 | #define TTC_IER_OFFSET 0x60 /* Interrupt Enable Reg, RW */ |
47 | |
48 | #define TTC_CNT_CNTRL_DISABLE_MASK 0x1 |
49 | |
50 | #define TTC_CLK_CNTRL_CSRC_MASK (1 << 5) /* clock source */ |
51 | #define TTC_CLK_CNTRL_PSV_MASK 0x1e |
52 | #define TTC_CLK_CNTRL_PSV_SHIFT 1 |
53 | |
54 | /* |
55 | * Setup the timers to use pre-scaling, using a fixed value for now that will |
56 | * work across most input frequency, but it may need to be more dynamic |
57 | */ |
58 | #define PRESCALE_EXPONENT 11 /* 2 ^ PRESCALE_EXPONENT = PRESCALE */ |
59 | #define PRESCALE 2048 /* The exponent must match this */ |
60 | #define CLK_CNTRL_PRESCALE ((PRESCALE_EXPONENT - 1) << 1) |
61 | #define CLK_CNTRL_PRESCALE_EN 1 |
62 | #define CNT_CNTRL_RESET (1 << 4) |
63 | |
64 | #define MAX_F_ERR 50 |
65 | |
66 | /** |
67 | * struct ttc_timer - This definition defines local timer structure |
68 | * |
69 | * @base_addr: Base address of timer |
70 | * @freq: Timer input clock frequency |
71 | * @clk: Associated clock source |
72 | * @clk_rate_change_nb Notifier block for clock rate changes |
73 | */ |
74 | struct ttc_timer { |
75 | void __iomem *base_addr; |
76 | unsigned long freq; |
77 | struct clk *clk; |
78 | struct notifier_block clk_rate_change_nb; |
79 | }; |
80 | |
81 | #define to_ttc_timer(x) \ |
82 | container_of(x, struct ttc_timer, clk_rate_change_nb) |
83 | |
84 | struct ttc_timer_clocksource { |
85 | u32 scale_clk_ctrl_reg_old; |
86 | u32 scale_clk_ctrl_reg_new; |
87 | struct ttc_timer ttc; |
88 | struct clocksource cs; |
89 | }; |
90 | |
91 | #define to_ttc_timer_clksrc(x) \ |
92 | container_of(x, struct ttc_timer_clocksource, cs) |
93 | |
94 | struct ttc_timer_clockevent { |
95 | struct ttc_timer ttc; |
96 | struct clock_event_device ce; |
97 | }; |
98 | |
99 | #define to_ttc_timer_clkevent(x) \ |
100 | container_of(x, struct ttc_timer_clockevent, ce) |
101 | |
102 | static void __iomem *ttc_sched_clock_val_reg; |
103 | |
104 | /** |
105 | * ttc_set_interval - Set the timer interval value |
106 | * |
107 | * @timer: Pointer to the timer instance |
108 | * @cycles: Timer interval ticks |
109 | **/ |
110 | static void ttc_set_interval(struct ttc_timer *timer, |
111 | unsigned long cycles) |
112 | { |
113 | u32 ctrl_reg; |
114 | |
115 | /* Disable the counter, set the counter value and re-enable counter */ |
116 | ctrl_reg = readl_relaxed(timer->base_addr + TTC_CNT_CNTRL_OFFSET); |
117 | ctrl_reg |= TTC_CNT_CNTRL_DISABLE_MASK; |
118 | writel_relaxed(ctrl_reg, timer->base_addr + TTC_CNT_CNTRL_OFFSET); |
119 | |
120 | writel_relaxed(cycles, timer->base_addr + TTC_INTR_VAL_OFFSET); |
121 | |
122 | /* |
123 | * Reset the counter (0x10) so that it starts from 0, one-shot |
124 | * mode makes this needed for timing to be right. |
125 | */ |
126 | ctrl_reg |= CNT_CNTRL_RESET; |
127 | ctrl_reg &= ~TTC_CNT_CNTRL_DISABLE_MASK; |
128 | writel_relaxed(ctrl_reg, timer->base_addr + TTC_CNT_CNTRL_OFFSET); |
129 | } |
130 | |
131 | /** |
132 | * ttc_clock_event_interrupt - Clock event timer interrupt handler |
133 | * |
134 | * @irq: IRQ number of the Timer |
135 | * @dev_id: void pointer to the ttc_timer instance |
136 | * |
137 | * returns: Always IRQ_HANDLED - success |
138 | **/ |
139 | static irqreturn_t ttc_clock_event_interrupt(int irq, void *dev_id) |
140 | { |
141 | struct ttc_timer_clockevent *ttce = dev_id; |
142 | struct ttc_timer *timer = &ttce->ttc; |
143 | |
144 | /* Acknowledge the interrupt and call event handler */ |
145 | readl_relaxed(timer->base_addr + TTC_ISR_OFFSET); |
146 | |
147 | ttce->ce.event_handler(&ttce->ce); |
148 | |
149 | return IRQ_HANDLED; |
150 | } |
151 | |
152 | /** |
153 | * __ttc_clocksource_read - Reads the timer counter register |
154 | * |
155 | * returns: Current timer counter register value |
156 | **/ |
157 | static u64 __ttc_clocksource_read(struct clocksource *cs) |
158 | { |
159 | struct ttc_timer *timer = &to_ttc_timer_clksrc(cs)->ttc; |
160 | |
161 | return (u64)readl_relaxed(timer->base_addr + |
162 | TTC_COUNT_VAL_OFFSET); |
163 | } |
164 | |
165 | static u64 notrace ttc_sched_clock_read(void) |
166 | { |
167 | return readl_relaxed(ttc_sched_clock_val_reg); |
168 | } |
169 | |
170 | /** |
171 | * ttc_set_next_event - Sets the time interval for next event |
172 | * |
173 | * @cycles: Timer interval ticks |
174 | * @evt: Address of clock event instance |
175 | * |
176 | * returns: Always 0 - success |
177 | **/ |
178 | static int ttc_set_next_event(unsigned long cycles, |
179 | struct clock_event_device *evt) |
180 | { |
181 | struct ttc_timer_clockevent *ttce = to_ttc_timer_clkevent(evt); |
182 | struct ttc_timer *timer = &ttce->ttc; |
183 | |
184 | ttc_set_interval(timer, cycles); |
185 | return 0; |
186 | } |
187 | |
188 | /** |
189 | * ttc_set_{shutdown|oneshot|periodic} - Sets the state of timer |
190 | * |
191 | * @evt: Address of clock event instance |
192 | **/ |
193 | static int ttc_shutdown(struct clock_event_device *evt) |
194 | { |
195 | struct ttc_timer_clockevent *ttce = to_ttc_timer_clkevent(evt); |
196 | struct ttc_timer *timer = &ttce->ttc; |
197 | u32 ctrl_reg; |
198 | |
199 | ctrl_reg = readl_relaxed(timer->base_addr + TTC_CNT_CNTRL_OFFSET); |
200 | ctrl_reg |= TTC_CNT_CNTRL_DISABLE_MASK; |
201 | writel_relaxed(ctrl_reg, timer->base_addr + TTC_CNT_CNTRL_OFFSET); |
202 | return 0; |
203 | } |
204 | |
205 | static int ttc_set_periodic(struct clock_event_device *evt) |
206 | { |
207 | struct ttc_timer_clockevent *ttce = to_ttc_timer_clkevent(evt); |
208 | struct ttc_timer *timer = &ttce->ttc; |
209 | |
210 | ttc_set_interval(timer, |
211 | DIV_ROUND_CLOSEST(ttce->ttc.freq, PRESCALE * HZ)); |
212 | return 0; |
213 | } |
214 | |
215 | static int ttc_resume(struct clock_event_device *evt) |
216 | { |
217 | struct ttc_timer_clockevent *ttce = to_ttc_timer_clkevent(evt); |
218 | struct ttc_timer *timer = &ttce->ttc; |
219 | u32 ctrl_reg; |
220 | |
221 | ctrl_reg = readl_relaxed(timer->base_addr + TTC_CNT_CNTRL_OFFSET); |
222 | ctrl_reg &= ~TTC_CNT_CNTRL_DISABLE_MASK; |
223 | writel_relaxed(ctrl_reg, timer->base_addr + TTC_CNT_CNTRL_OFFSET); |
224 | return 0; |
225 | } |
226 | |
227 | static int ttc_rate_change_clocksource_cb(struct notifier_block *nb, |
228 | unsigned long event, void *data) |
229 | { |
230 | struct clk_notifier_data *ndata = data; |
231 | struct ttc_timer *ttc = to_ttc_timer(nb); |
232 | struct ttc_timer_clocksource *ttccs = container_of(ttc, |
233 | struct ttc_timer_clocksource, ttc); |
234 | |
235 | switch (event) { |
236 | case PRE_RATE_CHANGE: |
237 | { |
238 | u32 psv; |
239 | unsigned long factor, rate_low, rate_high; |
240 | |
241 | if (ndata->new_rate > ndata->old_rate) { |
242 | factor = DIV_ROUND_CLOSEST(ndata->new_rate, |
243 | ndata->old_rate); |
244 | rate_low = ndata->old_rate; |
245 | rate_high = ndata->new_rate; |
246 | } else { |
247 | factor = DIV_ROUND_CLOSEST(ndata->old_rate, |
248 | ndata->new_rate); |
249 | rate_low = ndata->new_rate; |
250 | rate_high = ndata->old_rate; |
251 | } |
252 | |
253 | if (!is_power_of_2(n: factor)) |
254 | return NOTIFY_BAD; |
255 | |
256 | if (abs(rate_high - (factor * rate_low)) > MAX_F_ERR) |
257 | return NOTIFY_BAD; |
258 | |
259 | factor = __ilog2_u32(n: factor); |
260 | |
261 | /* |
262 | * store timer clock ctrl register so we can restore it in case |
263 | * of an abort. |
264 | */ |
265 | ttccs->scale_clk_ctrl_reg_old = |
266 | readl_relaxed(ttccs->ttc.base_addr + |
267 | TTC_CLK_CNTRL_OFFSET); |
268 | |
269 | psv = (ttccs->scale_clk_ctrl_reg_old & |
270 | TTC_CLK_CNTRL_PSV_MASK) >> |
271 | TTC_CLK_CNTRL_PSV_SHIFT; |
272 | if (ndata->new_rate < ndata->old_rate) |
273 | psv -= factor; |
274 | else |
275 | psv += factor; |
276 | |
277 | /* prescaler within legal range? */ |
278 | if (psv & ~(TTC_CLK_CNTRL_PSV_MASK >> TTC_CLK_CNTRL_PSV_SHIFT)) |
279 | return NOTIFY_BAD; |
280 | |
281 | ttccs->scale_clk_ctrl_reg_new = ttccs->scale_clk_ctrl_reg_old & |
282 | ~TTC_CLK_CNTRL_PSV_MASK; |
283 | ttccs->scale_clk_ctrl_reg_new |= psv << TTC_CLK_CNTRL_PSV_SHIFT; |
284 | |
285 | |
286 | /* scale down: adjust divider in post-change notification */ |
287 | if (ndata->new_rate < ndata->old_rate) |
288 | return NOTIFY_DONE; |
289 | |
290 | /* scale up: adjust divider now - before frequency change */ |
291 | writel_relaxed(ttccs->scale_clk_ctrl_reg_new, |
292 | ttccs->ttc.base_addr + TTC_CLK_CNTRL_OFFSET); |
293 | break; |
294 | } |
295 | case POST_RATE_CHANGE: |
296 | /* scale up: pre-change notification did the adjustment */ |
297 | if (ndata->new_rate > ndata->old_rate) |
298 | return NOTIFY_OK; |
299 | |
300 | /* scale down: adjust divider now - after frequency change */ |
301 | writel_relaxed(ttccs->scale_clk_ctrl_reg_new, |
302 | ttccs->ttc.base_addr + TTC_CLK_CNTRL_OFFSET); |
303 | break; |
304 | |
305 | case ABORT_RATE_CHANGE: |
306 | /* we have to undo the adjustment in case we scale up */ |
307 | if (ndata->new_rate < ndata->old_rate) |
308 | return NOTIFY_OK; |
309 | |
310 | /* restore original register value */ |
311 | writel_relaxed(ttccs->scale_clk_ctrl_reg_old, |
312 | ttccs->ttc.base_addr + TTC_CLK_CNTRL_OFFSET); |
313 | fallthrough; |
314 | default: |
315 | return NOTIFY_DONE; |
316 | } |
317 | |
318 | return NOTIFY_DONE; |
319 | } |
320 | |
321 | static int __init ttc_setup_clocksource(struct clk *clk, void __iomem *base, |
322 | u32 timer_width) |
323 | { |
324 | struct ttc_timer_clocksource *ttccs; |
325 | int err; |
326 | |
327 | ttccs = kzalloc(size: sizeof(*ttccs), GFP_KERNEL); |
328 | if (!ttccs) |
329 | return -ENOMEM; |
330 | |
331 | ttccs->ttc.clk = clk; |
332 | |
333 | err = clk_prepare_enable(clk: ttccs->ttc.clk); |
334 | if (err) { |
335 | kfree(objp: ttccs); |
336 | return err; |
337 | } |
338 | |
339 | ttccs->ttc.freq = clk_get_rate(clk: ttccs->ttc.clk); |
340 | |
341 | ttccs->ttc.clk_rate_change_nb.notifier_call = |
342 | ttc_rate_change_clocksource_cb; |
343 | ttccs->ttc.clk_rate_change_nb.next = NULL; |
344 | |
345 | err = clk_notifier_register(clk: ttccs->ttc.clk, |
346 | nb: &ttccs->ttc.clk_rate_change_nb); |
347 | if (err) |
348 | pr_warn("Unable to register clock notifier.\n" ); |
349 | |
350 | ttccs->ttc.base_addr = base; |
351 | ttccs->cs.name = "ttc_clocksource" ; |
352 | ttccs->cs.rating = 200; |
353 | ttccs->cs.read = __ttc_clocksource_read; |
354 | ttccs->cs.mask = CLOCKSOURCE_MASK(timer_width); |
355 | ttccs->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS; |
356 | |
357 | /* |
358 | * Setup the clock source counter to be an incrementing counter |
359 | * with no interrupt and it rolls over at 0xFFFF. Pre-scale |
360 | * it by 32 also. Let it start running now. |
361 | */ |
362 | writel_relaxed(0x0, ttccs->ttc.base_addr + TTC_IER_OFFSET); |
363 | writel_relaxed(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN, |
364 | ttccs->ttc.base_addr + TTC_CLK_CNTRL_OFFSET); |
365 | writel_relaxed(CNT_CNTRL_RESET, |
366 | ttccs->ttc.base_addr + TTC_CNT_CNTRL_OFFSET); |
367 | |
368 | err = clocksource_register_hz(cs: &ttccs->cs, hz: ttccs->ttc.freq / PRESCALE); |
369 | if (err) { |
370 | kfree(objp: ttccs); |
371 | return err; |
372 | } |
373 | |
374 | ttc_sched_clock_val_reg = base + TTC_COUNT_VAL_OFFSET; |
375 | sched_clock_register(read: ttc_sched_clock_read, bits: timer_width, |
376 | rate: ttccs->ttc.freq / PRESCALE); |
377 | |
378 | return 0; |
379 | } |
380 | |
381 | static int ttc_rate_change_clockevent_cb(struct notifier_block *nb, |
382 | unsigned long event, void *data) |
383 | { |
384 | struct clk_notifier_data *ndata = data; |
385 | struct ttc_timer *ttc = to_ttc_timer(nb); |
386 | struct ttc_timer_clockevent *ttcce = container_of(ttc, |
387 | struct ttc_timer_clockevent, ttc); |
388 | |
389 | switch (event) { |
390 | case POST_RATE_CHANGE: |
391 | /* update cached frequency */ |
392 | ttc->freq = ndata->new_rate; |
393 | |
394 | clockevents_update_freq(ce: &ttcce->ce, freq: ndata->new_rate / PRESCALE); |
395 | |
396 | fallthrough; |
397 | case PRE_RATE_CHANGE: |
398 | case ABORT_RATE_CHANGE: |
399 | default: |
400 | return NOTIFY_DONE; |
401 | } |
402 | } |
403 | |
404 | static int __init ttc_setup_clockevent(struct clk *clk, |
405 | void __iomem *base, u32 irq) |
406 | { |
407 | struct ttc_timer_clockevent *ttcce; |
408 | int err; |
409 | |
410 | ttcce = kzalloc(size: sizeof(*ttcce), GFP_KERNEL); |
411 | if (!ttcce) |
412 | return -ENOMEM; |
413 | |
414 | ttcce->ttc.clk = clk; |
415 | |
416 | err = clk_prepare_enable(clk: ttcce->ttc.clk); |
417 | if (err) |
418 | goto out_kfree; |
419 | |
420 | ttcce->ttc.clk_rate_change_nb.notifier_call = |
421 | ttc_rate_change_clockevent_cb; |
422 | ttcce->ttc.clk_rate_change_nb.next = NULL; |
423 | |
424 | err = clk_notifier_register(clk: ttcce->ttc.clk, |
425 | nb: &ttcce->ttc.clk_rate_change_nb); |
426 | if (err) { |
427 | pr_warn("Unable to register clock notifier.\n" ); |
428 | goto out_kfree; |
429 | } |
430 | |
431 | ttcce->ttc.freq = clk_get_rate(clk: ttcce->ttc.clk); |
432 | |
433 | ttcce->ttc.base_addr = base; |
434 | ttcce->ce.name = "ttc_clockevent" ; |
435 | ttcce->ce.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; |
436 | ttcce->ce.set_next_event = ttc_set_next_event; |
437 | ttcce->ce.set_state_shutdown = ttc_shutdown; |
438 | ttcce->ce.set_state_periodic = ttc_set_periodic; |
439 | ttcce->ce.set_state_oneshot = ttc_shutdown; |
440 | ttcce->ce.tick_resume = ttc_resume; |
441 | ttcce->ce.rating = 200; |
442 | ttcce->ce.irq = irq; |
443 | ttcce->ce.cpumask = cpu_possible_mask; |
444 | |
445 | /* |
446 | * Setup the clock event timer to be an interval timer which |
447 | * is prescaled by 32 using the interval interrupt. Leave it |
448 | * disabled for now. |
449 | */ |
450 | writel_relaxed(0x23, ttcce->ttc.base_addr + TTC_CNT_CNTRL_OFFSET); |
451 | writel_relaxed(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN, |
452 | ttcce->ttc.base_addr + TTC_CLK_CNTRL_OFFSET); |
453 | writel_relaxed(0x1, ttcce->ttc.base_addr + TTC_IER_OFFSET); |
454 | |
455 | err = request_irq(irq, handler: ttc_clock_event_interrupt, |
456 | IRQF_TIMER, name: ttcce->ce.name, dev: ttcce); |
457 | if (err) |
458 | goto out_kfree; |
459 | |
460 | clockevents_config_and_register(dev: &ttcce->ce, |
461 | freq: ttcce->ttc.freq / PRESCALE, min_delta: 1, max_delta: 0xfffe); |
462 | |
463 | return 0; |
464 | |
465 | out_kfree: |
466 | kfree(objp: ttcce); |
467 | return err; |
468 | } |
469 | |
470 | static int __init ttc_timer_probe(struct platform_device *pdev) |
471 | { |
472 | unsigned int irq; |
473 | void __iomem *timer_baseaddr; |
474 | struct clk *clk_cs, *clk_ce; |
475 | static int initialized; |
476 | int clksel, ret; |
477 | u32 timer_width = 16; |
478 | struct device_node *timer = pdev->dev.of_node; |
479 | |
480 | if (initialized) |
481 | return 0; |
482 | |
483 | initialized = 1; |
484 | |
485 | /* |
486 | * Get the 1st Triple Timer Counter (TTC) block from the device tree |
487 | * and use it. Note that the event timer uses the interrupt and it's the |
488 | * 2nd TTC hence the irq_of_parse_and_map(,1) |
489 | */ |
490 | timer_baseaddr = devm_of_iomap(dev: &pdev->dev, node: timer, index: 0, NULL); |
491 | if (IS_ERR(ptr: timer_baseaddr)) { |
492 | pr_err("ERROR: invalid timer base address\n" ); |
493 | return PTR_ERR(ptr: timer_baseaddr); |
494 | } |
495 | |
496 | irq = irq_of_parse_and_map(node: timer, index: 1); |
497 | if (irq <= 0) { |
498 | pr_err("ERROR: invalid interrupt number\n" ); |
499 | return -EINVAL; |
500 | } |
501 | |
502 | of_property_read_u32(np: timer, propname: "timer-width" , out_value: &timer_width); |
503 | |
504 | clksel = readl_relaxed(timer_baseaddr + TTC_CLK_CNTRL_OFFSET); |
505 | clksel = !!(clksel & TTC_CLK_CNTRL_CSRC_MASK); |
506 | clk_cs = of_clk_get(np: timer, index: clksel); |
507 | if (IS_ERR(ptr: clk_cs)) { |
508 | pr_err("ERROR: timer input clock not found\n" ); |
509 | return PTR_ERR(ptr: clk_cs); |
510 | } |
511 | |
512 | clksel = readl_relaxed(timer_baseaddr + 4 + TTC_CLK_CNTRL_OFFSET); |
513 | clksel = !!(clksel & TTC_CLK_CNTRL_CSRC_MASK); |
514 | clk_ce = of_clk_get(np: timer, index: clksel); |
515 | if (IS_ERR(ptr: clk_ce)) { |
516 | pr_err("ERROR: timer input clock not found\n" ); |
517 | ret = PTR_ERR(ptr: clk_ce); |
518 | goto put_clk_cs; |
519 | } |
520 | |
521 | ret = ttc_setup_clocksource(clk: clk_cs, base: timer_baseaddr, timer_width); |
522 | if (ret) |
523 | goto put_clk_ce; |
524 | |
525 | ret = ttc_setup_clockevent(clk: clk_ce, base: timer_baseaddr + 4, irq); |
526 | if (ret) |
527 | goto put_clk_ce; |
528 | |
529 | pr_info("%pOFn #0 at %p, irq=%d\n" , timer, timer_baseaddr, irq); |
530 | |
531 | return 0; |
532 | |
533 | put_clk_ce: |
534 | clk_put(clk: clk_ce); |
535 | put_clk_cs: |
536 | clk_put(clk: clk_cs); |
537 | return ret; |
538 | } |
539 | |
540 | static const struct of_device_id ttc_timer_of_match[] = { |
541 | {.compatible = "cdns,ttc" }, |
542 | {}, |
543 | }; |
544 | |
545 | MODULE_DEVICE_TABLE(of, ttc_timer_of_match); |
546 | |
547 | static struct platform_driver ttc_timer_driver = { |
548 | .driver = { |
549 | .name = "cdns_ttc_timer" , |
550 | .of_match_table = ttc_timer_of_match, |
551 | }, |
552 | }; |
553 | builtin_platform_driver_probe(ttc_timer_driver, ttc_timer_probe); |
554 | |