/* $OpenBSD: clock.c,v 1.43 2004/11/08 16:39:31 miod Exp $ */ /* * Copyright (c) 1999 Steve Murphree, Jr. * Copyright (c) 1995 Theo de Raadt * * 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 AUTHOR ``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 AUTHOR 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. * * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * Copyright (c) 1995 Nivas Madhur * Copyright (c) 1994 Gordon W. Ross * Copyright (c) 1993 Adam Glass * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratory. * * 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)clock.c 8.1 (Berkeley) 6/11/93 */ /* * Interval and statistic clocks driver. */ #include #include #include #include #include #include #include #include #include #include #include "pcctwo.h" #if NPCCTWO > 0 #include #include #include #endif #include "syscon.h" #if NSYSCON > 0 #include #include #endif #include #include "bugtty.h" #if NBUGTTY > 0 #include #endif int clockmatch(struct device *, void *, void *); void clockattach(struct device *, struct device *, void *); void sbc_init_clocks(void); void m188_init_clocks(void); void m188_cio_init(unsigned); u_int read_cio(int); void write_cio(int, u_int); struct clocksoftc { struct device sc_dev; struct intrhand sc_profih; struct intrhand sc_statih; }; struct cfattach clock_ca = { sizeof(struct clocksoftc), clockmatch, clockattach }; struct cfdriver clock_cd = { NULL, "clock", DV_DULL }; int sbc_clockintr(void *); int sbc_statintr(void *); int m188_clockintr(void *); int m188_statintr(void *); #if NPCCTWO > 0 u_int8_t prof_reset; u_int8_t stat_reset; #endif #if NSYSCON > 0 struct simplelock cio_lock; #define CIO_LOCK simple_lock(&cio_lock) #define CIO_UNLOCK simple_unlock(&cio_lock) #endif /* * Statistics clock interval and variance, in usec. Variance must be a * power of two. Since this gives us an even number, not an odd number, * we discard one case and compensate. That is, a variance of 4096 would * give us offsets in [0..4095]. Instead, we take offsets in [1..4095]. * This is symmetric about the point 2048, or statvar/2, and thus averages * to that value (assuming uniform random numbers). */ int statvar = 8192; int statmin; /* statclock interval - 1/2*variance */ /* * Every machine must have a clock tick device of some sort; for this * platform this file manages it, no matter what form it takes. */ int clockmatch(struct device *parent, void *vcf, void *args) { struct confargs *ca = args; struct cfdata *cf = vcf; if (strcmp(cf->cf_driver->cd_name, "clock")) { return (0); } /* * clock has to be at ipl 5 * We return the ipl here so that the parent can print * a message if it is different from what ioconf.c says. */ ca->ca_ipl = IPL_CLOCK; return (1); } void clockattach(struct device *parent, struct device *self, void *args) { struct confargs *ca = args; struct clocksoftc *sc = (struct clocksoftc *)self; switch (ca->ca_bustype) { #if NPCCTWO > 0 case BUS_PCCTWO: sc->sc_profih.ih_fn = sbc_clockintr; sc->sc_profih.ih_arg = 0; sc->sc_profih.ih_wantframe = 1; sc->sc_profih.ih_ipl = ca->ca_ipl; prof_reset = ca->ca_ipl | PCC2_IRQ_IEN | PCC2_IRQ_ICLR; pcctwointr_establish(PCC2V_TIMER1, &sc->sc_profih, "clock"); sc->sc_statih.ih_fn = sbc_statintr; sc->sc_statih.ih_arg = 0; sc->sc_statih.ih_wantframe = 1; sc->sc_statih.ih_ipl = ca->ca_ipl; stat_reset = ca->ca_ipl | PCC2_IRQ_IEN | PCC2_IRQ_ICLR; pcctwointr_establish(PCC2V_TIMER2, &sc->sc_statih, "stat"); md_init_clocks = sbc_init_clocks; break; #endif /* NPCCTWO */ #if NSYSCON > 0 case BUS_SYSCON: sc->sc_profih.ih_fn = m188_clockintr; sc->sc_profih.ih_arg = 0; sc->sc_profih.ih_wantframe = 1; sc->sc_profih.ih_ipl = ca->ca_ipl; sysconintr_establish(SYSCV_TIMER2, &sc->sc_profih, "clock"); sc->sc_statih.ih_fn = m188_statintr; sc->sc_statih.ih_arg = 0; sc->sc_statih.ih_wantframe = 1; sc->sc_statih.ih_ipl = ca->ca_ipl; sysconintr_establish(SYSCV_TIMER1, &sc->sc_statih, "stat"); md_init_clocks = m188_init_clocks; break; #endif /* NSYSCON */ } printf("\n"); } #if NPCCTWO > 0 void sbc_init_clocks(void) { int statint, minint; #ifdef DIAGNOSTIC if (1000000 % hz) { printf("cannot get %d Hz clock; using 100 Hz\n", hz); hz = 100; } #endif tick = 1000000 / hz; /* profclock */ *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T1CTL) = 0; *(volatile u_int32_t *)(OBIO_START + PCC2_BASE + PCCTWO_T1CMP) = pcc2_timer_us2lim(tick); *(volatile u_int32_t *)(OBIO_START + PCC2_BASE + PCCTWO_T1COUNT) = 0; *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T1CTL) = PCC2_TCTL_CEN | PCC2_TCTL_COC | PCC2_TCTL_COVF; *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T1ICR) = prof_reset; if (stathz == 0) stathz = hz; #ifdef DIAGNOSTIC if (1000000 % stathz) { printf("cannot get %d Hz statclock; using 100 Hz\n", stathz); stathz = 100; } #endif profhz = stathz; /* always */ statint = 1000000 / stathz; minint = statint / 2 + 100; while (statvar > minint) statvar >>= 1; /* statclock */ *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2CTL) = 0; *(volatile u_int32_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2CMP) = pcc2_timer_us2lim(statint); *(volatile u_int32_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2COUNT) = 0; *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2CTL) = PCC2_TCTL_CEN | PCC2_TCTL_COC | PCC2_TCTL_COVF; *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2ICR) = stat_reset; statmin = statint - (statvar >> 1); } /* * clockintr: ack intr and call hardclock */ int sbc_clockintr(void *eframe) { *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T1ICR) = prof_reset; intrcnt[M88K_CLK_IRQ]++; hardclock(eframe); #if NBUGTTY > 0 bugtty_chkinput(); #endif /* NBUGTTY */ return (1); } int sbc_statintr(void *eframe) { u_long newint, r, var; *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2ICR) = stat_reset; intrcnt[M88K_SCLK_IRQ]++; statclock((struct clockframe *)eframe); /* * Compute new randomized interval. The intervals are uniformly * distributed on [statint - statvar / 2, statint + statvar / 2], * and therefore have mean statint, giving a stathz frequency clock. */ var = statvar; do { r = random() & (var - 1); } while (r == 0); newint = statmin + r; *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2CTL) = 0; *(volatile u_int32_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2CMP) = pcc2_timer_us2lim(newint); *(volatile u_int32_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2COUNT) = 0; *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2ICR) = stat_reset; *(volatile u_int8_t *)(OBIO_START + PCC2_BASE + PCCTWO_T2CTL) = PCC2_TCTL_CEN | PCC2_TCTL_COC; return (1); } #endif /* NPCCTWO */ #if NSYSCON > 0 /* * Notes on the MVME188 clock usage: * * We have two sources for timers: * - two counter/timers in the DUART (MC68681/MC68692) * - three counter/timers in the Zilog Z8536 * * However: * - Z8536 CT#3 is reserved as a watchdog device; and its input is * user-controllable with jumpers on the SYSCON board, so we can't * really use it. * - When using the Z8536 in timer mode, it _seems_ like it resets at * 0xffff instead of the initial count value... * - Despite having per-counter programmable interrupt vectors, the * SYSCON logic forces fixed vectors for the DUART and the Z8536 timer * interrupts. * - The DUART timers keep counting down from 0xffff even after * interrupting, and need to be manually stopped, then restarted, to * resume counting down the initial count value. * * Also, while the Z8536 has a very reliable 4MHz clock source, the * 3.6864MHz clock source of the DUART timers does not seem to be correct. * * As a result, clock is run on a Z8536 counter, kept in counter mode and * retriggered every interrupt, while statclock is run on a DUART counter, * but in practice runs at an average 96Hz instead of the expected 100Hz. * * It should be possible to run statclock on the Z8536 counter #2, but * this would make interrupt handling more tricky, in the case both * counters interrupt at the same time... */ void m188_init_clocks(void) { volatile u_int32_t imr; int statint, minint; #ifdef DIAGNOSTIC if (1000000 % hz) { printf("cannot get %d Hz clock; using 100 Hz\n", hz); hz = 100; } #endif tick = 1000000 / hz; simple_lock_init(&cio_lock); m188_cio_init(tick); if (stathz == 0) stathz = hz; #ifdef DIAGNOSTIC if (1000000 % stathz) { printf("cannot get %d Hz statclock; using 100 Hz\n", stathz); stathz = 100; } #endif profhz = stathz; /* always */ /* * The DUART runs at 3.6864 MHz, CT#1 will run in PCLK/16 mode. */ statint = (3686400 / 16) / stathz; minint = statint / 2 + 100; while (statvar > minint) statvar >>= 1; statmin = statint - (statvar >> 1); /* clear the counter/timer output OP3 while we program the DART */ *(volatile u_int32_t *)DART_OPCR = 0x00; /* set interrupt vec */ *(volatile u_int32_t *)DART_IVR = SYSCON_VECT + SYSCV_TIMER1; /* do the stop counter/timer command */ imr = *(volatile u_int32_t *)DART_STOPC; /* set counter/timer to counter mode, PCLK/16 */ *(volatile u_int32_t *)DART_ACR = 0x30; *(volatile u_int32_t *)DART_CTUR = (statint >> 8); *(volatile u_int32_t *)DART_CTLR = (statint & 0xff); /* set the counter/timer output OP3 */ *(volatile u_int32_t *)DART_OPCR = 0x04; /* give the start counter/timer command */ imr = *(volatile u_int32_t *)DART_STARTC; } int m188_clockintr(void *eframe) { CIO_LOCK; write_cio(CIO_CSR1, CIO_GCB | CIO_CIP); /* Ack the interrupt */ intrcnt[M88K_CLK_IRQ]++; hardclock(eframe); #if NBUGTTY > 0 bugtty_chkinput(); #endif /* NBUGTTY */ /* restart counter */ write_cio(CIO_CSR1, CIO_GCB | CIO_TCB | CIO_IE); CIO_UNLOCK; return (1); } int m188_statintr(void *eframe) { volatile u_int32_t tmp; u_long newint, r, var; /* stop counter and acknowledge interrupt */ tmp = *(volatile u_int32_t *)DART_STOPC; tmp = *(volatile u_int32_t *)DART_ISR; intrcnt[M88K_SCLK_IRQ]++; statclock((struct clockframe *)eframe); /* * Compute new randomized interval. The intervals are uniformly * distributed on [statint - statvar / 2, statint + statvar / 2], * and therefore have mean statint, giving a stathz frequency clock. */ var = statvar; do { r = random() & (var - 1); } while (r == 0); newint = statmin + r; /* setup new value and restart counter */ *(volatile u_int32_t *)DART_CTUR = (newint >> 8); *(volatile u_int32_t *)DART_CTLR = (newint & 0xff); tmp = *(volatile u_int32_t *)DART_STARTC; return (1); } /* Write CIO register */ void write_cio(int reg, u_int val) { int s; volatile int i; volatile u_int32_t * cio_ctrl = (volatile u_int32_t *)CIO_CTRL; s = splclock(); CIO_LOCK; i = *cio_ctrl; /* goto state 1 */ *cio_ctrl = 0; /* take CIO out of RESET */ i = *cio_ctrl; /* reset CIO state machine */ *cio_ctrl = (reg & 0xff); /* select register */ *cio_ctrl = (val & 0xff); /* write the value */ CIO_UNLOCK; splx(s); } /* Read CIO register */ u_int read_cio(int reg) { int c, s; volatile int i; volatile u_int32_t * cio_ctrl = (volatile u_int32_t *)CIO_CTRL; s = splclock(); CIO_LOCK; /* select register */ *cio_ctrl = (reg & 0xff); /* delay for a short time to allow 8536 to settle */ for (i = 0; i < 100; i++) ; /* read the value */ c = *cio_ctrl; CIO_UNLOCK; splx(s); return (c & 0xff); } /* * Initialize the CTC (8536) * Only the counter/timers are used - the IO ports are un-comitted. */ void m188_cio_init(unsigned period) { volatile int i; CIO_LOCK; /* Start by forcing chip into known state */ read_cio(CIO_MICR); write_cio(CIO_MICR, CIO_MICR_RESET); /* Reset the CTC */ for (i = 0; i < 1000; i++) /* Loop to delay */ ; /* Clear reset and start init seq. */ write_cio(CIO_MICR, 0x00); /* Wait for chip to come ready */ while ((read_cio(CIO_MICR) & CIO_MICR_RJA) == 0) ; /* Initialize the 8536 for real */ write_cio(CIO_MICR, CIO_MICR_MIE /* | CIO_MICR_NV */ | CIO_MICR_RJA | CIO_MICR_DLC); write_cio(CIO_CTMS1, CIO_CTMS_CSC); /* Continuous count */ write_cio(CIO_PDCB, 0xff); /* set port B to input */ period <<= 1; /* CT#1 runs at PCLK/2, hence 2MHz */ write_cio(CIO_CT1MSB, period >> 8); write_cio(CIO_CT1LSB, period); /* enable counter #1 */ write_cio(CIO_MCCR, CIO_MCCR_CT1E | CIO_MCCR_PBE); write_cio(CIO_CSR1, CIO_GCB | CIO_TCB | CIO_IE); CIO_UNLOCK; } #endif /* NSYSCON */ void delay(int us) { if (brdtyp == BRD_188) { extern void m188_delay(int); m188_delay(us); } else { /* * On MVME187 and MVME197, use the VMEchip for the * delay clock. */ *(volatile u_int32_t *)(VME2_BASE + VME2_T1CMP) = 0xffffffff; *(volatile u_int32_t *)(VME2_BASE + VME2_T1COUNT) = 0; *(volatile u_int32_t *)(VME2_BASE + VME2_TCTL) |= VME2_TCTL1_CEN; while ((*(volatile u_int32_t *)(VME2_BASE + VME2_T1COUNT)) < (u_int32_t)us) ; *(volatile u_int32_t *)(VME2_BASE + VME2_TCTL) &= ~VME2_TCTL1_CEN; } }