 @@ -1,333 +1,336 @@
-/*	$NetBSD: a9tmr.c,v 1.4 2012/11/29 17:36:56 matt Exp $	*/
+/*	$NetBSD: a9tmr.c,v 1.5 2013/06/12 00:59:50 matt Exp $	*/
 /*-
  * Copyright (c) 2012 The NetBSD Foundation, Inc.
  * All rights reserved.
+ *
  * This code is derived from software contributed to The NetBSD Foundation
  * by Matt Thomas
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: a9tmr.c,v 1.4 2012/11/29 17:36:56 matt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: a9tmr.c,v 1.5 2013/06/12 00:59:50 matt Exp $");
 #include <sys/param.h>
 #include <sys/bus.h>
 #include <sys/device.h>
 #include <sys/intr.h>
 #include <sys/kernel.h>
 #include <sys/proc.h>
 #include <sys/systm.h>
 #include <sys/timetc.h>
 #include <prop/proplib.h>
 #include <arm/cortex/a9tmr_reg.h>
 #include <arm/cortex/a9tmr_var.h>
 #include <arm/cortex/mpcore_var.h>
 static int a9tmr_match(device_t, cfdata_t, void *);
 static void a9tmr_attach(device_t, device_t, void *);
 static int clockhandler(void *);
 static u_int a9tmr_get_timecount(struct timecounter *);
 static struct a9tmr_softc a9tmr_sc;
 static struct timecounter a9tmr_timecounter = {
 	.tc_get_timecount = a9tmr_get_timecount,
 	.tc_poll_pps = 0,
 	.tc_counter_mask = ~0u,
 	.tc_frequency = 0,			/* set by cpu_initclocks() */
 	.tc_name = NULL,			/* set by attach */
 	.tc_quality = 500,
 	.tc_priv = &a9tmr_sc,
 	.tc_next = NULL,
 };
 CFATTACH_DECL_NEW(a9tmr, 0, a9tmr_match, a9tmr_attach, NULL, NULL);
 static inline uint32_t
 a9tmr_global_read(struct a9tmr_softc *sc, bus_size_t o)
+{
 	return bus_space_read_4(sc->sc_memt, sc->sc_global_memh, o);
+}
 static inline void
 a9tmr_global_write(struct a9tmr_softc *sc, bus_size_t o, uint32_t v)
+{
 	bus_space_write_4(sc->sc_memt, sc->sc_global_memh, o, v);
+}
 /* ARGSUSED */
 static int
 a9tmr_match(device_t parent, cfdata_t cf, void *aux)
+{
 	struct mpcore_attach_args * const mpcaa = aux;
 	if (a9tmr_sc.sc_dev != NULL)
 		return 0;
 	if ((armreg_pfr1_read() & ARM_PFR1_GTIMER_MASK) != 0)
 		return 0;
 	if (!CPU_ID_CORTEX_A9_P(curcpu()->ci_arm_cpuid))
 		return 0;
 	if (strcmp(mpcaa->mpcaa_name, cf->cf_name) != 0)
 		return 0;
 	/*
 	 * This isn't present on UP A9s (since CBAR isn't present).
 	 */
 	uint32_t mpidr = armreg_mpidr_read();
 	if (mpidr == 0 || (mpidr & MPIDR_U))
 		return 0;
 	return 1;
+}
 static void
 a9tmr_attach(device_t parent, device_t self, void *aux)
+{
         struct a9tmr_softc *sc = &a9tmr_sc;
 	struct mpcore_attach_args * const mpcaa = aux;
 	prop_dictionary_t dict = device_properties(self);
 	char freqbuf[sizeof("XXX SHz")];
 	/*
 	 * This runs at the ARM PERIPHCLOCK which should be 1/2 of the CPU clock.
 	 * The MD code should have setup our frequency for us.
 	 */
 	prop_number_t pn = prop_dictionary_get(dict, "frequency");
 	KASSERT(pn != NULL);
 	sc->sc_freq = prop_number_unsigned_integer_value(pn);
 	humanize_number(freqbuf, sizeof(freqbuf), sc->sc_freq, "Hz", 1000);
 	aprint_naive("\n");
 	aprint_normal(": A9 Global 64-bit Timer (%s)\n", freqbuf);
 	self->dv_private = sc;
 	sc->sc_dev = self;
 	sc->sc_memt = mpcaa->mpcaa_memt;
 	sc->sc_memh = mpcaa->mpcaa_memh;
 	evcnt_attach_dynamic(&sc->sc_ev_missing_ticks, EVCNT_TYPE_MISC, NULL,
 	    device_xname(self), "missing interrupts");
 	bus_space_subregion(sc->sc_memt, sc->sc_memh,
 	    TMR_GLOBAL_BASE, TMR_GLOBAL_BASE, &sc->sc_global_memh);
 	bus_space_subregion(sc->sc_memt, sc->sc_memh,
 	    TMR_PRIVATE_BASE, TMR_PRIVATE_SIZE, &sc->sc_private_memh);
 	bus_space_subregion(sc->sc_memt, sc->sc_memh,
 	    TMR_WDOG_BASE, TMR_WDOG_SIZE, &sc->sc_wdog_memh);
 	sc->sc_global_ih = intr_establish(IRQ_A9TMR_PPI_GTIMER, IPL_CLOCK,
 	    IST_EDGE, clockhandler, NULL);
 	if (sc->sc_global_ih == NULL)
 		panic("%s: unable to register timer interrupt", __func__);
 	aprint_normal_dev(sc->sc_dev, "interrupting on irq %d\n",
 	    IRQ_A9TMR_PPI_GTIMER);
+}
 static inline uint64_t
 a9tmr_gettime(struct a9tmr_softc *sc)
+{
 	uint32_t lo, hi;
 	do {
 		hi = a9tmr_global_read(sc, TMR_GBL_CTR_U);
 		lo = a9tmr_global_read(sc, TMR_GBL_CTR_L);
 	} while (hi != a9tmr_global_read(sc, TMR_GBL_CTR_U));
 	return ((uint64_t)hi << 32) | lo;
+}
 void
 a9tmr_init_cpu_clock(struct cpu_info *ci)
+{
 	struct a9tmr_softc * const sc = &a9tmr_sc;
 	uint64_t now = a9tmr_gettime(sc);
 	KASSERT(ci == curcpu());
 	ci->ci_lastintr = now;
 	a9tmr_global_write(sc, TMR_GBL_AUTOINC, sc->sc_autoinc);
 	/*
 	 * To update the compare register we have to disable comparisions first.
 	 */
 	uint32_t ctl = a9tmr_global_read(sc, TMR_GBL_CTL);
 	if (ctl & TMR_GBL_CTL_CMP_ENABLE) {
 		a9tmr_global_write(sc, TMR_GBL_CTL, ctl & ~TMR_GBL_CTL_CMP_ENABLE);
+	}
 	/*
 	 * Schedule the next interrupt.
 	 */
 	now += sc->sc_autoinc;
 	a9tmr_global_write(sc, TMR_GBL_CMP_L, (uint32_t) now);
 	a9tmr_global_write(sc, TMR_GBL_CMP_H, (uint32_t) (now >> 32));
 	/*
 	 * Re-enable the comparator and now enable interrupts.
 	 */
 	a9tmr_global_write(sc, TMR_GBL_INT, 1);	/* clear interrupt pending */
 	ctl |= TMR_GBL_CTL_CMP_ENABLE | TMR_GBL_CTL_INT_ENABLE | TMR_GBL_CTL_AUTO_INC | TMR_CTL_ENABLE;
 	a9tmr_global_write(sc, TMR_GBL_CTL, ctl);
 #if 0
 	printf("%s: %s: ctl %#x autoinc %u cmp %#x%08x now %#"PRIx64"\n",
 	    __func__, ci->ci_data.cpu_name,
 	    a9tmr_global_read(sc, TMR_GBL_CTL),
 	    a9tmr_global_read(sc, TMR_GBL_AUTOINC),
 	    a9tmr_global_read(sc, TMR_GBL_CMP_H),
 	    a9tmr_global_read(sc, TMR_GBL_CMP_L),
 	    a9tmr_gettime(sc));
 	int s = splsched();
 	uint64_t when = now;
 	u_int n = 0;
 	while ((now = a9tmr_gettime(sc)) < when) {
 		/* spin */
 		n++;
 		KASSERTMSG(n <= sc->sc_autoinc,
 		    "spun %u times but only %"PRIu64" has passed",
 		    n, when - now);
+	}
 	printf("%s: %s: status %#x cmp %#x%08x now %#"PRIx64"\n",
 	    __func__, ci->ci_data.cpu_name,
 	    a9tmr_global_read(sc, TMR_GBL_INT),
 	    a9tmr_global_read(sc, TMR_GBL_CMP_H),
 	    a9tmr_global_read(sc, TMR_GBL_CMP_L),
 	    a9tmr_gettime(sc));
 	splx(s);
 #elif 0
 	delay(1000000 / hz + 1000);
 #endif
+}
 void
 cpu_initclocks(void)
+{
 	struct a9tmr_softc * const sc = &a9tmr_sc;
 	KASSERT(sc->sc_dev != NULL);
 	KASSERT(sc->sc_freq != 0);
 	sc->sc_autoinc = sc->sc_freq / hz;
 	a9tmr_init_cpu_clock(curcpu());
 	a9tmr_timecounter.tc_name = device_xname(sc->sc_dev);
 	a9tmr_timecounter.tc_frequency = sc->sc_freq;
 	tc_init(&a9tmr_timecounter);
+}
 void
 a9tmr_delay(unsigned int n)
+{
 	struct a9tmr_softc * const sc = &a9tmr_sc;
 	KASSERT(sc != NULL);
 	uint32_t freq = sc->sc_freq ? sc->sc_freq : curcpu()->ci_data.cpu_cc_freq / 2;
 	KASSERT(freq != 0);
 	/*
 	 * not quite divide by 1000000 but close enough
 	 * (higher by 1.3% which means we wait 1.3% longer).
 	 */
 	const uint64_t incr_per_us = (freq >> 20) + (freq >> 24);
 	const uint64_t delta = n * incr_per_us;
 	const uint64_t base = a9tmr_gettime(sc);
 	const uint64_t finish = base + delta;
 	while (a9tmr_gettime(sc) < finish) {
 		/* spin */
+	}
+}
 /*
  * clockhandler:
+ *
  *	Handle the hardclock interrupt.
  */
 static int
 clockhandler(void *arg)
+{
 	struct clockframe * const cf = arg;
 	struct a9tmr_softc * const sc = &a9tmr_sc;
 	struct cpu_info * const ci = curcpu();
 	const uint64_t now = a9tmr_gettime(sc);
 	uint64_t delta = now - ci->ci_lastintr;
 	a9tmr_global_write(sc, TMR_GBL_INT, 1);	// Ack the interrupt
 #if 0
 	printf("%s(%p): %s: now %#"PRIx64" delta %"PRIu64"\n",
 	     __func__, cf, ci->ci_data.cpu_name, now, delta);
 #endif
 	KASSERTMSG(delta > sc->sc_autoinc / 100,
 	    "%s: interrupting too quickly (delta=%"PRIu64")",
 	    ci->ci_data.cpu_name, delta);
 	ci->ci_lastintr = now;
 	hardclock(cf);
 #if 0
 	/*
 	 * Try to make up up to a seconds amount of missed clock interrupts
 	 */
 	u_int ticks = hz;
 	for (delta -= sc->sc_autoinc;
 	     ticks > 0 && delta >= sc->sc_autoinc;
 	     delta -= sc->sc_autoinc, ticks--) {
 		hardclock(cf);
+	}
 #else
 	if (delta > sc->sc_autoinc)
 		sc->sc_ev_missing_ticks.ev_count += delta / sc->sc_autoinc;
 #endif
 	return 1;
+}
 void
 setstatclockrate(int newhz)
+{
+}
 static u_int
 a9tmr_get_timecount(struct timecounter *tc)
+{
 	struct a9tmr_softc * const sc = tc->tc_priv;
 	return (u_int) (a9tmr_gettime(sc));
+}