2 * Copyright (c) 2006 Benno Rice.
3 * Copyright (C) 2007-2008 MARVELL INTERNATIONAL LTD.
6 * Adapted to Marvell SoC by Semihalf.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * from: FreeBSD: //depot/projects/arm/src/sys/arm/xscale/pxa2x0/pxa2x0_timer.c, rev 1
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/malloc.h>
41 #include <sys/timeet.h>
42 #include <sys/timetc.h>
43 #include <sys/watchdog.h>
44 #include <machine/bus.h>
45 #include <machine/cpu.h>
46 #include <machine/intr.h>
48 #include <arm/mv/mvreg.h>
49 #include <arm/mv/mvvar.h>
51 #include <dev/ofw/ofw_bus.h>
52 #include <dev/ofw/ofw_bus_subr.h>
54 #define INITIAL_TIMECOUNTER (0xffffffff)
55 #define MAX_WATCHDOG_TICKS (0xffffffff)
57 #if defined(SOC_MV_ARMADAXP)
58 #define MV_CLOCK_SRC 25000000 /* Timers' 25MHz mode */
60 #define MV_CLOCK_SRC get_tclk()
63 struct mv_timer_softc {
64 struct resource * timer_res[2];
65 bus_space_tag_t timer_bst;
66 bus_space_handle_t timer_bsh;
71 static struct resource_spec mv_timer_spec[] = {
72 { SYS_RES_MEMORY, 0, RF_ACTIVE },
73 { SYS_RES_IRQ, 0, RF_ACTIVE },
77 static struct mv_timer_softc *timer_softc = NULL;
78 static int timers_initialized = 0;
80 static int mv_timer_probe(device_t);
81 static int mv_timer_attach(device_t);
83 static int mv_hardclock(void *);
84 static unsigned mv_timer_get_timecount(struct timecounter *);
86 static uint32_t mv_get_timer_control(void);
87 static void mv_set_timer_control(uint32_t);
88 static uint32_t mv_get_timer(uint32_t);
89 static void mv_set_timer(uint32_t, uint32_t);
90 static void mv_set_timer_rel(uint32_t, uint32_t);
91 static void mv_watchdog_enable(void);
92 static void mv_watchdog_disable(void);
93 static void mv_watchdog_event(void *, unsigned int, int *);
94 static int mv_timer_start(struct eventtimer *et,
95 sbintime_t first, sbintime_t period);
96 static int mv_timer_stop(struct eventtimer *et);
97 static void mv_setup_timers(void);
99 static struct timecounter mv_timer_timecounter = {
100 .tc_get_timecount = mv_timer_get_timecount,
101 .tc_name = "CPUTimer1",
102 .tc_frequency = 0, /* This is assigned on the fly in the init sequence */
103 .tc_counter_mask = ~0u,
108 mv_timer_probe(device_t dev)
111 if (!ofw_bus_status_okay(dev))
114 if (!ofw_bus_is_compatible(dev, "mrvl,timer"))
117 device_set_desc(dev, "Marvell CPU Timer");
122 mv_timer_attach(device_t dev)
126 struct mv_timer_softc *sc;
127 #if !defined(SOC_MV_ARMADAXP)
128 uint32_t irq_cause, irq_mask;
131 if (timer_softc != NULL)
134 sc = (struct mv_timer_softc *)device_get_softc(dev);
137 error = bus_alloc_resources(dev, mv_timer_spec, sc->timer_res);
139 device_printf(dev, "could not allocate resources\n");
143 sc->timer_bst = rman_get_bustag(sc->timer_res[0]);
144 sc->timer_bsh = rman_get_bushandle(sc->timer_res[0]);
146 mtx_init(&timer_softc->timer_mtx, "watchdog", NULL, MTX_DEF);
147 mv_watchdog_disable();
148 EVENTHANDLER_REGISTER(watchdog_list, mv_watchdog_event, sc, 0);
150 if (bus_setup_intr(dev, sc->timer_res[1], INTR_TYPE_CLK,
151 mv_hardclock, NULL, sc, &ihl) != 0) {
152 bus_release_resources(dev, mv_timer_spec, sc->timer_res);
153 device_printf(dev, "Could not setup interrupt.\n");
158 #if !defined(SOC_MV_ARMADAXP)
159 irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
160 irq_cause &= IRQ_TIMER0_CLR;
162 write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
163 irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK);
164 irq_mask |= IRQ_TIMER0_MASK;
165 irq_mask &= ~IRQ_TIMER1_MASK;
166 write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask);
168 sc->et.et_name = "CPUTimer0";
169 sc->et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT;
170 sc->et.et_quality = 1000;
172 sc->et.et_frequency = MV_CLOCK_SRC;
173 sc->et.et_min_period = (0x00000002LLU << 32) / sc->et.et_frequency;
174 sc->et.et_max_period = (0xfffffffeLLU << 32) / sc->et.et_frequency;
175 sc->et.et_start = mv_timer_start;
176 sc->et.et_stop = mv_timer_stop;
178 et_register(&sc->et);
179 mv_timer_timecounter.tc_frequency = MV_CLOCK_SRC;
180 tc_init(&mv_timer_timecounter);
186 mv_hardclock(void *arg)
188 struct mv_timer_softc *sc;
191 irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
192 irq_cause &= IRQ_TIMER0_CLR;
193 write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
195 sc = (struct mv_timer_softc *)arg;
196 if (sc->et.et_active)
197 sc->et.et_event_cb(&sc->et, sc->et.et_arg);
199 return (FILTER_HANDLED);
202 static device_method_t mv_timer_methods[] = {
203 DEVMETHOD(device_probe, mv_timer_probe),
204 DEVMETHOD(device_attach, mv_timer_attach),
209 static driver_t mv_timer_driver = {
212 sizeof(struct mv_timer_softc),
215 static devclass_t mv_timer_devclass;
217 DRIVER_MODULE(timer, simplebus, mv_timer_driver, mv_timer_devclass, 0, 0);
220 mv_timer_get_timecount(struct timecounter *tc)
223 return (INITIAL_TIMECOUNTER - mv_get_timer(1));
230 cpu_initclocks_bsp();
236 uint32_t val, val_temp;
239 if (!timers_initialized) {
240 for (; usec > 0; usec--)
241 for (val = 100; val > 0; val--)
242 __asm __volatile("nop" ::: "memory");
246 val = mv_get_timer(1);
247 nticks = ((MV_CLOCK_SRC / 1000000 + 1) * usec);
250 val_temp = mv_get_timer(1);
252 nticks -= (val - val_temp);
254 nticks -= (val + (INITIAL_TIMECOUNTER - val_temp));
261 mv_get_timer_control(void)
264 return (bus_space_read_4(timer_softc->timer_bst,
265 timer_softc->timer_bsh, CPU_TIMER_CONTROL));
269 mv_set_timer_control(uint32_t val)
272 bus_space_write_4(timer_softc->timer_bst,
273 timer_softc->timer_bsh, CPU_TIMER_CONTROL, val);
277 mv_get_timer(uint32_t timer)
280 return (bus_space_read_4(timer_softc->timer_bst,
281 timer_softc->timer_bsh, CPU_TIMER0 + timer * 0x8));
285 mv_set_timer(uint32_t timer, uint32_t val)
288 bus_space_write_4(timer_softc->timer_bst,
289 timer_softc->timer_bsh, CPU_TIMER0 + timer * 0x8, val);
293 mv_set_timer_rel(uint32_t timer, uint32_t val)
296 bus_space_write_4(timer_softc->timer_bst,
297 timer_softc->timer_bsh, CPU_TIMER0_REL + timer * 0x8, val);
301 mv_watchdog_enable(void)
303 uint32_t val, irq_cause;
304 #if !defined(SOC_MV_ARMADAXP)
308 irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
309 irq_cause &= IRQ_TIMER_WD_CLR;
310 write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
312 #if defined(SOC_MV_ARMADAXP)
313 val = read_cpu_mp_clocks(WD_RSTOUTn_MASK);
314 val |= (WD_GLOBAL_MASK | WD_CPU0_MASK);
315 write_cpu_mp_clocks(WD_RSTOUTn_MASK, val);
317 irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK);
318 irq_mask |= IRQ_TIMER_WD_MASK;
319 write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask);
321 val = read_cpu_ctrl(RSTOUTn_MASK);
322 val |= WD_RST_OUT_EN;
323 write_cpu_ctrl(RSTOUTn_MASK, val);
326 val = mv_get_timer_control();
327 val |= CPU_TIMER_WD_EN | CPU_TIMER_WD_AUTO;
328 #if defined(SOC_MV_ARMADAXP)
329 val |= CPU_TIMER_WD_25MHZ_EN;
331 mv_set_timer_control(val);
335 mv_watchdog_disable(void)
337 uint32_t val, irq_cause;
338 #if !defined(SOC_MV_ARMADAXP)
342 val = mv_get_timer_control();
343 val &= ~(CPU_TIMER_WD_EN | CPU_TIMER_WD_AUTO);
344 mv_set_timer_control(val);
346 #if defined(SOC_MV_ARMADAXP)
347 val = read_cpu_mp_clocks(WD_RSTOUTn_MASK);
348 val &= ~(WD_GLOBAL_MASK | WD_CPU0_MASK);
349 write_cpu_mp_clocks(WD_RSTOUTn_MASK, val);
351 val = read_cpu_ctrl(RSTOUTn_MASK);
352 val &= ~WD_RST_OUT_EN;
353 write_cpu_ctrl(RSTOUTn_MASK, val);
355 irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK);
356 irq_mask &= ~(IRQ_TIMER_WD_MASK);
357 write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask);
360 irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE);
361 irq_cause &= IRQ_TIMER_WD_CLR;
362 write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause);
367 * Watchdog event handler.
370 mv_watchdog_event(void *arg, unsigned int cmd, int *error)
375 mtx_lock(&timer_softc->timer_mtx);
377 mv_watchdog_disable();
380 * Watchdog timeout is in nanosecs, calculation according to
383 ns = (uint64_t)1 << (cmd & WD_INTERVAL);
384 ticks = (uint64_t)(ns * MV_CLOCK_SRC) / 1000000000;
385 if (ticks > MAX_WATCHDOG_TICKS)
386 mv_watchdog_disable();
388 /* Timer 2 is the watchdog */
389 mv_set_timer(2, ticks);
390 mv_watchdog_enable();
394 mtx_unlock(&timer_softc->timer_mtx);
398 mv_timer_start(struct eventtimer *et, sbintime_t first, sbintime_t period)
400 struct mv_timer_softc *sc;
403 /* Calculate dividers. */
404 sc = (struct mv_timer_softc *)et->et_priv;
406 val = ((uint32_t)sc->et.et_frequency * period) >> 32;
410 val1 = ((uint32_t)sc->et.et_frequency * first) >> 32;
414 /* Apply configuration. */
415 mv_set_timer_rel(0, val);
416 mv_set_timer(0, val1);
417 val = mv_get_timer_control();
418 val |= CPU_TIMER0_EN;
420 val |= CPU_TIMER0_AUTO;
422 val &= ~CPU_TIMER0_AUTO;
423 mv_set_timer_control(val);
428 mv_timer_stop(struct eventtimer *et)
432 val = mv_get_timer_control();
433 val &= ~(CPU_TIMER0_EN | CPU_TIMER0_AUTO);
434 mv_set_timer_control(val);
439 mv_setup_timers(void)
443 mv_set_timer_rel(1, INITIAL_TIMECOUNTER);
444 mv_set_timer(1, INITIAL_TIMECOUNTER);
445 val = mv_get_timer_control();
446 val &= ~(CPU_TIMER0_EN | CPU_TIMER0_AUTO);
447 val |= CPU_TIMER1_EN | CPU_TIMER1_AUTO;
448 #if defined(SOC_MV_ARMADAXP)
449 /* Enable 25MHz mode */
450 val |= CPU_TIMER0_25MHZ_EN | CPU_TIMER1_25MHZ_EN;
452 mv_set_timer_control(val);
453 timers_initialized = 1;