1 /*-
2 * Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/malloc.h>
36 #include <sys/rman.h>
37 #include <sys/timeet.h>
38 #include <sys/timetc.h>
39 #include <sys/watchdog.h>
40 #include <machine/bus.h>
41 #include <machine/intr.h>
42 #include <machine/machdep.h>
43
44 #include <dev/ofw/openfirm.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
47
48 #include <dev/extres/clk/clk.h>
49
50 #if defined(__aarch64__)
51 #include "opt_soc.h"
52 #else
53 #include <arm/allwinner/aw_machdep.h>
54 #endif
55
56 /**
57 * Timer registers addr
58 *
59 */
60 #define TIMER_IRQ_EN_REG 0x00
61 #define TIMER_IRQ_ENABLE(x) (1 << x)
62
63 #define TIMER_IRQ_STA_REG 0x04
64 #define TIMER_IRQ_PENDING(x) (1 << x)
65
66 /*
67 * On A10, A13, A20 and A31/A31s 6 timers are available
68 */
69 #define TIMER_CTRL_REG(x) (0x10 + 0x10 * x)
70 #define TIMER_CTRL_START (1 << 0)
71 #define TIMER_CTRL_AUTORELOAD (1 << 1)
72 #define TIMER_CTRL_CLKSRC_MASK (3 << 2)
73 #define TIMER_CTRL_OSC24M (1 << 2)
74 #define TIMER_CTRL_PRESCALAR_MASK (0x7 << 4)
75 #define TIMER_CTRL_PRESCALAR(x) ((x - 1) << 4)
76 #define TIMER_CTRL_MODE_MASK (1 << 7)
77 #define TIMER_CTRL_MODE_SINGLE (1 << 7)
78 #define TIMER_CTRL_MODE_CONTINUOUS (0 << 7)
79 #define TIMER_INTV_REG(x) (0x14 + 0x10 * x)
80 #define TIMER_CURV_REG(x) (0x18 + 0x10 * x)
81
82 /* 64 bit counter, available in A10 and A13 */
83 #define CNT64_CTRL_REG 0xa0
84 #define CNT64_CTRL_RL_EN 0x02 /* read latch enable */
85 #define CNT64_LO_REG 0xa4
86 #define CNT64_HI_REG 0xa8
87
88 #define SYS_TIMER_CLKSRC 24000000 /* clock source */
89
90 enum a10_timer_type {
91 A10_TIMER = 1,
92 A23_TIMER,
93 };
94
95 struct a10_timer_softc {
96 device_t sc_dev;
97 struct resource *res[2];
98 void *sc_ih; /* interrupt handler */
99 uint32_t sc_period;
100 uint64_t timer0_freq;
101 struct eventtimer et;
102 enum a10_timer_type type;
103 };
104
105 #define timer_read_4(sc, reg) \
106 bus_read_4(sc->res[A10_TIMER_MEMRES], reg)
107 #define timer_write_4(sc, reg, val) \
108 bus_write_4(sc->res[A10_TIMER_MEMRES], reg, val)
109
110 static u_int a10_timer_get_timecount(struct timecounter *);
111 #if defined(__arm__)
112 static int a10_timer_timer_start(struct eventtimer *,
113 sbintime_t first, sbintime_t period);
114 static int a10_timer_timer_stop(struct eventtimer *);
115 #endif
116
117 static uint64_t timer_read_counter64(struct a10_timer_softc *sc);
118 #if defined(__arm__)
119 static void a10_timer_eventtimer_setup(struct a10_timer_softc *sc);
120 #endif
121
122 #if defined(__aarch64__)
123 static void a23_timer_timecounter_setup(struct a10_timer_softc *sc);
124 static u_int a23_timer_get_timecount(struct timecounter *tc);
125 #endif
126
127 static int a10_timer_irq(void *);
128 static int a10_timer_probe(device_t);
129 static int a10_timer_attach(device_t);
130
131 #if defined(__arm__)
132 static delay_func a10_timer_delay;
133 #endif
134
135 static struct timecounter a10_timer_timecounter = {
136 .tc_name = "a10_timer timer0",
137 .tc_get_timecount = a10_timer_get_timecount,
138 .tc_counter_mask = ~0u,
139 .tc_frequency = 0,
140 .tc_quality = 1000,
141 };
142
143 #if defined(__aarch64__)
144 static struct timecounter a23_timer_timecounter = {
145 .tc_name = "a10_timer timer0",
146 .tc_get_timecount = a23_timer_get_timecount,
147 .tc_counter_mask = ~0u,
148 .tc_frequency = 0,
149 /* We want it to be selected over the arm generic timecounter */
150 .tc_quality = 2000,
151 };
152 #endif
153
154 #define A10_TIMER_MEMRES 0
155 #define A10_TIMER_IRQRES 1
156
157 static struct resource_spec a10_timer_spec[] = {
158 { SYS_RES_MEMORY, 0, RF_ACTIVE },
159 { SYS_RES_IRQ, 0, RF_ACTIVE },
160 { -1, 0 }
161 };
162
163 static struct ofw_compat_data compat_data[] = {
164 {"allwinner,sun4i-a10-timer", A10_TIMER},
165 #if defined(__aarch64__)
166 {"allwinner,sun8i-a23-timer", A23_TIMER},
167 #endif
168 {NULL, 0},
169 };
170
171 static int
172 a10_timer_probe(device_t dev)
173 {
174 #if defined(__arm__)
175 u_int soc_family;
176 #endif
177
178 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
179 return (ENXIO);
180
181 #if defined(__arm__)
182 /* For SoC >= A10 we have the ARM Timecounter/Eventtimer */
183 soc_family = allwinner_soc_family();
184 if (soc_family != ALLWINNERSOC_SUN4I &&
185 soc_family != ALLWINNERSOC_SUN5I)
186 return (ENXIO);
187 #endif
188
189 device_set_desc(dev, "Allwinner timer");
190 return (BUS_PROBE_DEFAULT);
191 }
192
193 static int
194 a10_timer_attach(device_t dev)
195 {
196 struct a10_timer_softc *sc;
197 clk_t clk;
198 int err;
199
200 sc = device_get_softc(dev);
201 sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
202
203 if (bus_alloc_resources(dev, a10_timer_spec, sc->res)) {
204 device_printf(dev, "could not allocate resources\n");
205 return (ENXIO);
206 }
207
208 sc->sc_dev = dev;
209
210 /* Setup and enable the timer interrupt */
211 err = bus_setup_intr(dev, sc->res[A10_TIMER_IRQRES], INTR_TYPE_CLK,
212 a10_timer_irq, NULL, sc, &sc->sc_ih);
213 if (err != 0) {
214 bus_release_resources(dev, a10_timer_spec, sc->res);
215 device_printf(dev, "Unable to setup the clock irq handler, "
216 "err = %d\n", err);
217 return (ENXIO);
218 }
219
220 if (clk_get_by_ofw_index(dev, 0, 0, &clk) != 0)
221 sc->timer0_freq = SYS_TIMER_CLKSRC;
222 else {
223 if (clk_get_freq(clk, &sc->timer0_freq) != 0) {
224 device_printf(dev, "Cannot get clock source frequency\n");
225 return (ENXIO);
226 }
227 }
228
229 #if defined(__arm__)
230 a10_timer_eventtimer_setup(sc);
231 arm_set_delay(a10_timer_delay, sc);
232 a10_timer_timecounter.tc_priv = sc;
233 a10_timer_timecounter.tc_frequency = sc->timer0_freq;
234 tc_init(&a10_timer_timecounter);
235 #elif defined(__aarch64__)
236 a23_timer_timecounter_setup(sc);
237 #endif
238
239 if (bootverbose) {
240 device_printf(sc->sc_dev, "clock: hz=%d stathz = %d\n", hz, stathz);
241
242 device_printf(sc->sc_dev, "event timer clock frequency %ju\n",
243 sc->timer0_freq);
244 device_printf(sc->sc_dev, "timecounter clock frequency %jd\n",
245 a10_timer_timecounter.tc_frequency);
246 }
247
248 return (0);
249 }
250
251 static int
252 a10_timer_irq(void *arg)
253 {
254 struct a10_timer_softc *sc;
255 uint32_t val;
256
257 sc = (struct a10_timer_softc *)arg;
258
259 /* Clear interrupt pending bit. */
260 timer_write_4(sc, TIMER_IRQ_STA_REG, TIMER_IRQ_PENDING(0));
261
262 val = timer_read_4(sc, TIMER_CTRL_REG(0));
263
264 /*
265 * Disabled autoreload and sc_period > 0 means
266 * timer_start was called with non NULL first value.
267 * Now we will set periodic timer with the given period
268 * value.
269 */
270 if ((val & (1<<1)) == 0 && sc->sc_period > 0) {
271 /* Update timer */
272 timer_write_4(sc, TIMER_CURV_REG(0), sc->sc_period);
273
274 /* Make periodic and enable */
275 val |= TIMER_CTRL_AUTORELOAD | TIMER_CTRL_START;
276 timer_write_4(sc, TIMER_CTRL_REG(0), val);
277 }
278
279 if (sc->et.et_active)
280 sc->et.et_event_cb(&sc->et, sc->et.et_arg);
281
282 return (FILTER_HANDLED);
283 }
284
285 /*
286 * Event timer function for A10 and A13
287 */
288
289 #if defined(__arm__)
290 static void
291 a10_timer_eventtimer_setup(struct a10_timer_softc *sc)
292 {
293 uint32_t val;
294
295 /* Set clock source to OSC24M, 1 pre-division, continuous mode */
296 val = timer_read_4(sc, TIMER_CTRL_REG(0));
297 val &= ~TIMER_CTRL_PRESCALAR_MASK | ~TIMER_CTRL_MODE_MASK | ~TIMER_CTRL_CLKSRC_MASK;
298 val |= TIMER_CTRL_PRESCALAR(1) | TIMER_CTRL_OSC24M;
299 timer_write_4(sc, TIMER_CTRL_REG(0), val);
300
301 /* Enable timer0 */
302 val = timer_read_4(sc, TIMER_IRQ_EN_REG);
303 val |= TIMER_IRQ_ENABLE(0);
304 timer_write_4(sc, TIMER_IRQ_EN_REG, val);
305
306 /* Set desired frequency in event timer and timecounter */
307 sc->et.et_frequency = sc->timer0_freq;
308 sc->et.et_name = "a10_timer Eventtimer";
309 sc->et.et_flags = ET_FLAGS_ONESHOT | ET_FLAGS_PERIODIC;
310 sc->et.et_quality = 1000;
311 sc->et.et_min_period = (0x00000005LLU << 32) / sc->et.et_frequency;
312 sc->et.et_max_period = (0xfffffffeLLU << 32) / sc->et.et_frequency;
313 sc->et.et_start = a10_timer_timer_start;
314 sc->et.et_stop = a10_timer_timer_stop;
315 sc->et.et_priv = sc;
316 et_register(&sc->et);
317 }
318
319 static int
320 a10_timer_timer_start(struct eventtimer *et, sbintime_t first,
321 sbintime_t period)
322 {
323 struct a10_timer_softc *sc;
324 uint32_t count;
325 uint32_t val;
326
327 sc = (struct a10_timer_softc *)et->et_priv;
328
329 if (period != 0)
330 sc->sc_period = ((uint32_t)et->et_frequency * period) >> 32;
331 else
332 sc->sc_period = 0;
333 if (first != 0)
334 count = ((uint32_t)et->et_frequency * first) >> 32;
335 else
336 count = sc->sc_period;
337
338 /* Update timer values */
339 timer_write_4(sc, TIMER_INTV_REG(0), sc->sc_period);
340 timer_write_4(sc, TIMER_CURV_REG(0), count);
341
342 val = timer_read_4(sc, TIMER_CTRL_REG(0));
343 if (period != 0) {
344 /* periodic */
345 val |= TIMER_CTRL_AUTORELOAD;
346 } else {
347 /* oneshot */
348 val &= ~TIMER_CTRL_AUTORELOAD;
349 }
350 /* Enable timer0 */
351 val |= TIMER_IRQ_ENABLE(0);
352 timer_write_4(sc, TIMER_CTRL_REG(0), val);
353
354 return (0);
355 }
356
357 static int
358 a10_timer_timer_stop(struct eventtimer *et)
359 {
360 struct a10_timer_softc *sc;
361 uint32_t val;
362
363 sc = (struct a10_timer_softc *)et->et_priv;
364
365 /* Disable timer0 */
366 val = timer_read_4(sc, TIMER_CTRL_REG(0));
367 val &= ~TIMER_CTRL_START;
368 timer_write_4(sc, TIMER_CTRL_REG(0), val);
369
370 sc->sc_period = 0;
371
372 return (0);
373 }
374 #endif
375
376 /*
377 * Timecounter functions for A23 and above
378 */
379
380 #if defined(__aarch64__)
381 static void
382 a23_timer_timecounter_setup(struct a10_timer_softc *sc)
383 {
384 uint32_t val;
385
386 /* Set clock source to OSC24M, 1 pre-division, continuous mode */
387 val = timer_read_4(sc, TIMER_CTRL_REG(0));
388 val &= ~TIMER_CTRL_PRESCALAR_MASK | ~TIMER_CTRL_MODE_MASK | ~TIMER_CTRL_CLKSRC_MASK;
389 val |= TIMER_CTRL_PRESCALAR(1) | TIMER_CTRL_OSC24M;
390 timer_write_4(sc, TIMER_CTRL_REG(0), val);
391
392 /* Set reload value */
393 timer_write_4(sc, TIMER_INTV_REG(0), ~0);
394 val = timer_read_4(sc, TIMER_INTV_REG(0));
395
396 /* Enable timer0 */
397 val = timer_read_4(sc, TIMER_CTRL_REG(0));
398 val |= TIMER_CTRL_AUTORELOAD | TIMER_CTRL_START;
399 timer_write_4(sc, TIMER_CTRL_REG(0), val);
400
401 val = timer_read_4(sc, TIMER_CURV_REG(0));
402
403 a23_timer_timecounter.tc_priv = sc;
404 a23_timer_timecounter.tc_frequency = sc->timer0_freq;
405 tc_init(&a23_timer_timecounter);
406 }
407
408 static u_int
409 a23_timer_get_timecount(struct timecounter *tc)
410 {
411 struct a10_timer_softc *sc;
412 uint32_t val;
413
414 sc = (struct a10_timer_softc *)tc->tc_priv;
415 if (sc == NULL)
416 return (0);
417
418 val = timer_read_4(sc, TIMER_CURV_REG(0));
419 /* Counter count backwards */
420 return (~0u - val);
421 }
422 #endif
423
424 /*
425 * Timecounter functions for A10 and A13, using the 64 bits counter
426 */
427
428 static uint64_t
429 timer_read_counter64(struct a10_timer_softc *sc)
430 {
431 uint32_t lo, hi;
432
433 /* Latch counter, wait for it to be ready to read. */
434 timer_write_4(sc, CNT64_CTRL_REG, CNT64_CTRL_RL_EN);
435 while (timer_read_4(sc, CNT64_CTRL_REG) & CNT64_CTRL_RL_EN)
436 continue;
437
438 hi = timer_read_4(sc, CNT64_HI_REG);
439 lo = timer_read_4(sc, CNT64_LO_REG);
440
441 return (((uint64_t)hi << 32) | lo);
442 }
443
444 #if defined(__arm__)
445 static void
446 a10_timer_delay(int usec, void *arg)
447 {
448 struct a10_timer_softc *sc = arg;
449 uint64_t end, now;
450
451 now = timer_read_counter64(sc);
452 end = now + (sc->timer0_freq / 1000000) * (usec + 1);
453
454 while (now < end)
455 now = timer_read_counter64(sc);
456 }
457 #endif
458
459 static u_int
460 a10_timer_get_timecount(struct timecounter *tc)
461 {
462
463 if (tc->tc_priv == NULL)
464 return (0);
465
466 return ((u_int)timer_read_counter64(tc->tc_priv));
467 }
468
469 static device_method_t a10_timer_methods[] = {
470 DEVMETHOD(device_probe, a10_timer_probe),
471 DEVMETHOD(device_attach, a10_timer_attach),
472
473 DEVMETHOD_END
474 };
475
476 static driver_t a10_timer_driver = {
477 "a10_timer",
478 a10_timer_methods,
479 sizeof(struct a10_timer_softc),
480 };
481
482 static devclass_t a10_timer_devclass;
483
484 EARLY_DRIVER_MODULE(a10_timer, simplebus, a10_timer_driver, a10_timer_devclass, 0, 0,
485 BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE);
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