2 * Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/malloc.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>
44 #include <dev/ofw/openfirm.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
48 #include <dev/extres/clk/clk.h>
50 #if defined(__aarch64__)
53 #include <arm/allwinner/aw_machdep.h>
57 * Timer registers addr
60 #define TIMER_IRQ_EN_REG 0x00
61 #define TIMER_IRQ_ENABLE(x) (1 << x)
63 #define TIMER_IRQ_STA_REG 0x04
64 #define TIMER_IRQ_PENDING(x) (1 << x)
67 * On A10, A13, A20 and A31/A31s 6 timers are available
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)
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
88 #define SYS_TIMER_CLKSRC 24000000 /* clock source */
95 struct a10_timer_softc {
97 struct resource *res[2];
98 void *sc_ih; /* interrupt handler */
100 uint64_t timer0_freq;
101 struct eventtimer et;
102 enum a10_timer_type type;
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)
110 static u_int a10_timer_get_timecount(struct timecounter *);
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 *);
117 static uint64_t timer_read_counter64(struct a10_timer_softc *sc);
119 static void a10_timer_eventtimer_setup(struct a10_timer_softc *sc);
122 static void a23_timer_timecounter_setup(struct a10_timer_softc *sc);
123 static u_int a23_timer_get_timecount(struct timecounter *tc);
125 static int a10_timer_irq(void *);
126 static int a10_timer_probe(device_t);
127 static int a10_timer_attach(device_t);
130 static delay_func a10_timer_delay;
133 static struct timecounter a10_timer_timecounter = {
134 .tc_name = "a10_timer timer0",
135 .tc_get_timecount = a10_timer_get_timecount,
136 .tc_counter_mask = ~0u,
141 static struct timecounter a23_timer_timecounter = {
142 .tc_name = "a10_timer timer0",
143 .tc_get_timecount = a23_timer_get_timecount,
144 .tc_counter_mask = ~0u,
146 /* We want it to be selected over the arm generic timecounter */
150 #define A10_TIMER_MEMRES 0
151 #define A10_TIMER_IRQRES 1
153 static struct resource_spec a10_timer_spec[] = {
154 { SYS_RES_MEMORY, 0, RF_ACTIVE },
155 { SYS_RES_IRQ, 0, RF_ACTIVE },
159 static struct ofw_compat_data compat_data[] = {
160 {"allwinner,sun4i-a10-timer", A10_TIMER},
161 {"allwinner,sun8i-a23-timer", A23_TIMER},
166 a10_timer_probe(device_t dev)
168 struct a10_timer_softc *sc;
173 sc = device_get_softc(dev);
175 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
179 /* For SoC >= A10 we have the ARM Timecounter/Eventtimer */
180 soc_family = allwinner_soc_family();
181 if (soc_family != ALLWINNERSOC_SUN4I &&
182 soc_family != ALLWINNERSOC_SUN5I)
186 device_set_desc(dev, "Allwinner timer");
187 return (BUS_PROBE_DEFAULT);
191 a10_timer_attach(device_t dev)
193 struct a10_timer_softc *sc;
197 sc = device_get_softc(dev);
198 sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
200 if (bus_alloc_resources(dev, a10_timer_spec, sc->res)) {
201 device_printf(dev, "could not allocate resources\n");
207 /* Setup and enable the timer interrupt */
208 err = bus_setup_intr(dev, sc->res[A10_TIMER_IRQRES], INTR_TYPE_CLK,
209 a10_timer_irq, NULL, sc, &sc->sc_ih);
211 bus_release_resources(dev, a10_timer_spec, sc->res);
212 device_printf(dev, "Unable to setup the clock irq handler, "
217 if (clk_get_by_ofw_index(dev, 0, 0, &clk) != 0)
218 sc->timer0_freq = SYS_TIMER_CLKSRC;
220 if (clk_get_freq(clk, &sc->timer0_freq) != 0) {
221 device_printf(dev, "Cannot get clock source frequency\n");
227 a10_timer_eventtimer_setup(sc);
228 arm_set_delay(a10_timer_delay, sc);
229 a10_timer_timecounter.tc_priv = sc;
230 a10_timer_timecounter.tc_frequency = sc->timer0_freq;
231 tc_init(&a10_timer_timecounter);
232 #elif defined(__aarch64__)
233 a23_timer_timecounter_setup(sc);
237 device_printf(sc->sc_dev, "clock: hz=%d stathz = %d\n", hz, stathz);
239 device_printf(sc->sc_dev, "event timer clock frequency %ju\n",
241 device_printf(sc->sc_dev, "timecounter clock frequency %jd\n",
242 a10_timer_timecounter.tc_frequency);
249 a10_timer_irq(void *arg)
251 struct a10_timer_softc *sc;
254 sc = (struct a10_timer_softc *)arg;
256 /* Clear interrupt pending bit. */
257 timer_write_4(sc, TIMER_IRQ_STA_REG, TIMER_IRQ_PENDING(0));
259 val = timer_read_4(sc, TIMER_CTRL_REG(0));
262 * Disabled autoreload and sc_period > 0 means
263 * timer_start was called with non NULL first value.
264 * Now we will set periodic timer with the given period
267 if ((val & (1<<1)) == 0 && sc->sc_period > 0) {
269 timer_write_4(sc, TIMER_CURV_REG(0), sc->sc_period);
271 /* Make periodic and enable */
272 val |= TIMER_CTRL_AUTORELOAD | TIMER_CTRL_START;
273 timer_write_4(sc, TIMER_CTRL_REG(0), val);
276 if (sc->et.et_active)
277 sc->et.et_event_cb(&sc->et, sc->et.et_arg);
279 return (FILTER_HANDLED);
283 * Event timer function for A10 and A13
288 a10_timer_eventtimer_setup(struct a10_timer_softc *sc)
292 /* Set clock source to OSC24M, 1 pre-division, continuous mode */
293 val = timer_read_4(sc, TIMER_CTRL_REG(0));
294 val &= ~TIMER_CTRL_PRESCALAR_MASK | ~TIMER_CTRL_MODE_MASK | ~TIMER_CTRL_CLKSRC_MASK;
295 val |= TIMER_CTRL_PRESCALAR(1) | TIMER_CTRL_OSC24M;
296 timer_write_4(sc, TIMER_CTRL_REG(0), val);
299 val = timer_read_4(sc, TIMER_IRQ_EN_REG);
300 val |= TIMER_IRQ_ENABLE(0);
301 timer_write_4(sc, TIMER_IRQ_EN_REG, val);
303 /* Set desired frequency in event timer and timecounter */
304 sc->et.et_frequency = sc->timer0_freq;
305 sc->et.et_name = "a10_timer Eventtimer";
306 sc->et.et_flags = ET_FLAGS_ONESHOT | ET_FLAGS_PERIODIC;
307 sc->et.et_quality = 1000;
308 sc->et.et_min_period = (0x00000005LLU << 32) / sc->et.et_frequency;
309 sc->et.et_max_period = (0xfffffffeLLU << 32) / sc->et.et_frequency;
310 sc->et.et_start = a10_timer_timer_start;
311 sc->et.et_stop = a10_timer_timer_stop;
313 et_register(&sc->et);
317 a10_timer_timer_start(struct eventtimer *et, sbintime_t first,
320 struct a10_timer_softc *sc;
324 sc = (struct a10_timer_softc *)et->et_priv;
327 sc->sc_period = ((uint32_t)et->et_frequency * period) >> 32;
331 count = ((uint32_t)et->et_frequency * first) >> 32;
333 count = sc->sc_period;
335 /* Update timer values */
336 timer_write_4(sc, TIMER_INTV_REG(0), sc->sc_period);
337 timer_write_4(sc, TIMER_CURV_REG(0), count);
339 val = timer_read_4(sc, TIMER_CTRL_REG(0));
342 val |= TIMER_CTRL_AUTORELOAD;
345 val &= ~TIMER_CTRL_AUTORELOAD;
348 val |= TIMER_IRQ_ENABLE(0);
349 timer_write_4(sc, TIMER_CTRL_REG(0), val);
355 a10_timer_timer_stop(struct eventtimer *et)
357 struct a10_timer_softc *sc;
360 sc = (struct a10_timer_softc *)et->et_priv;
363 val = timer_read_4(sc, TIMER_CTRL_REG(0));
364 val &= ~TIMER_CTRL_START;
365 timer_write_4(sc, TIMER_CTRL_REG(0), val);
374 * Timecounter functions for A23 and above
378 a23_timer_timecounter_setup(struct a10_timer_softc *sc)
382 /* Set clock source to OSC24M, 1 pre-division, continuous mode */
383 val = timer_read_4(sc, TIMER_CTRL_REG(0));
384 val &= ~TIMER_CTRL_PRESCALAR_MASK | ~TIMER_CTRL_MODE_MASK | ~TIMER_CTRL_CLKSRC_MASK;
385 val |= TIMER_CTRL_PRESCALAR(1) | TIMER_CTRL_OSC24M;
386 timer_write_4(sc, TIMER_CTRL_REG(0), val);
388 /* Set reload value */
389 timer_write_4(sc, TIMER_INTV_REG(0), ~0);
390 val = timer_read_4(sc, TIMER_INTV_REG(0));
393 val = timer_read_4(sc, TIMER_CTRL_REG(0));
394 val |= TIMER_CTRL_AUTORELOAD | TIMER_CTRL_START;
395 timer_write_4(sc, TIMER_CTRL_REG(0), val);
397 val = timer_read_4(sc, TIMER_CURV_REG(0));
399 a23_timer_timecounter.tc_priv = sc;
400 a23_timer_timecounter.tc_frequency = sc->timer0_freq;
401 tc_init(&a23_timer_timecounter);
405 a23_timer_get_timecount(struct timecounter *tc)
407 struct a10_timer_softc *sc;
410 sc = (struct a10_timer_softc *)tc->tc_priv;
414 val = timer_read_4(sc, TIMER_CURV_REG(0));
415 /* Counter count backwards */
420 * Timecounter functions for A10 and A13, using the 64 bits counter
424 timer_read_counter64(struct a10_timer_softc *sc)
428 /* Latch counter, wait for it to be ready to read. */
429 timer_write_4(sc, CNT64_CTRL_REG, CNT64_CTRL_RL_EN);
430 while (timer_read_4(sc, CNT64_CTRL_REG) & CNT64_CTRL_RL_EN)
433 hi = timer_read_4(sc, CNT64_HI_REG);
434 lo = timer_read_4(sc, CNT64_LO_REG);
436 return (((uint64_t)hi << 32) | lo);
441 a10_timer_delay(int usec, void *arg)
443 struct a10_timer_softc *sc = arg;
446 now = timer_read_counter64(sc);
447 end = now + (sc->timer0_freq / 1000000) * (usec + 1);
450 now = timer_read_counter64(sc);
455 a10_timer_get_timecount(struct timecounter *tc)
458 if (tc->tc_priv == NULL)
461 return ((u_int)timer_read_counter64(tc->tc_priv));
464 static device_method_t a10_timer_methods[] = {
465 DEVMETHOD(device_probe, a10_timer_probe),
466 DEVMETHOD(device_attach, a10_timer_attach),
471 static driver_t a10_timer_driver = {
474 sizeof(struct a10_timer_softc),
477 static devclass_t a10_timer_devclass;
479 EARLY_DRIVER_MODULE(a10_timer, simplebus, a10_timer_driver, a10_timer_devclass, 0, 0,
480 BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE);