Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/mvme/clock_pcctwo.c
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1 /* $NetBSD: clock_pcctwo.c,v 1.17 2012/10/27 17:18:27 chs Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Steve C. Woodford. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Glue for the Peripheral Channel Controller Two (PCCChip2) timers, 34 * the Memory Controller ASIC (MCchip, and the Mostek clock chip found 35 * on the MVME-1[67]7, MVME-1[67]2 and MVME-187 series of boards. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: clock_pcctwo.c,v 1.17 2012/10/27 17:18:27 chs Exp $"); 40 41 #include <sys/param.h> 42 #include <sys/kernel.h> 43 #include <sys/systm.h> 44 #include <sys/device.h> 45 #include <sys/timetc.h> 46 47 #include <machine/psl.h> 48 #include <sys/bus.h> 49 50 #include <dev/mvme/clockvar.h> 51 #include <dev/mvme/pcctwovar.h> 52 #include <dev/mvme/pcctworeg.h> 53 54 55 int clock_pcctwo_match(device_t, cfdata_t, void *); 56 void clock_pcctwo_attach(device_t, device_t, void *); 57 58 struct clock_pcctwo_softc { 59 struct clock_attach_args sc_clock_args; 60 u_char sc_clock_lvl; 61 struct timecounter sc_tc; 62 }; 63 64 CFATTACH_DECL_NEW(clock_pcctwo, sizeof(struct clock_pcctwo_softc), 65 clock_pcctwo_match, clock_pcctwo_attach, NULL, NULL); 66 67 extern struct cfdriver clock_cd; 68 69 static int clock_pcctwo_profintr(void *); 70 static int clock_pcctwo_statintr(void *); 71 static void clock_pcctwo_initclocks(void *, int, int); 72 static u_int clock_pcctwo_getcount(struct timecounter *); 73 static void clock_pcctwo_shutdown(void *); 74 75 static struct clock_pcctwo_softc *clock_pcctwo_sc; 76 static uint32_t clock_pcctwo_count; 77 78 /* ARGSUSED */ 79 int 80 clock_pcctwo_match(device_t parent, cfdata_t cf, void *aux) 81 { 82 struct pcctwo_attach_args *pa = aux; 83 84 /* Only one clock, please. */ 85 if (clock_pcctwo_sc) 86 return (0); 87 88 if (strcmp(pa->pa_name, clock_cd.cd_name)) 89 return (0); 90 91 pa->pa_ipl = cf->pcctwocf_ipl; 92 93 return (1); 94 } 95 96 /* ARGSUSED */ 97 void 98 clock_pcctwo_attach(device_t parent, device_t self, void *aux) 99 { 100 struct clock_pcctwo_softc *sc; 101 struct pcctwo_attach_args *pa; 102 103 sc = clock_pcctwo_sc = device_private(self); 104 pa = aux; 105 106 if (pa->pa_ipl != CLOCK_LEVEL) 107 panic("clock_pcctwo_attach: wrong interrupt level"); 108 109 sc->sc_clock_args.ca_arg = sc; 110 sc->sc_clock_args.ca_initfunc = clock_pcctwo_initclocks; 111 112 /* Do common portions of clock config. */ 113 clock_config(self, &sc->sc_clock_args, pcctwointr_evcnt(pa->pa_ipl)); 114 115 /* Ensure our interrupts get disabled at shutdown time. */ 116 (void) shutdownhook_establish(clock_pcctwo_shutdown, NULL); 117 118 sc->sc_clock_lvl = (pa->pa_ipl & PCCTWO_ICR_LEVEL_MASK) | 119 PCCTWO_ICR_ICLR | PCCTWO_ICR_IEN; 120 121 /* Attach the interrupt handlers. */ 122 pcctwointr_establish(PCCTWOV_TIMER1, clock_pcctwo_profintr, 123 pa->pa_ipl, NULL, &clock_profcnt); 124 pcctwointr_establish(PCCTWOV_TIMER2, clock_pcctwo_statintr, 125 pa->pa_ipl, NULL, &clock_statcnt); 126 } 127 128 void 129 clock_pcctwo_initclocks(void *arg, int prof_us, int stat_us) 130 { 131 struct clock_pcctwo_softc *sc; 132 133 sc = arg; 134 135 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER1_CONTROL, PCCTWO_TT_CTRL_COVF); 136 pcc2_reg_write32(sys_pcctwo, PCC2REG_TIMER1_COUNTER, 0); 137 pcc2_reg_write32(sys_pcctwo, PCC2REG_TIMER1_COMPARE, 138 PCCTWO_US2LIM(prof_us)); 139 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER1_CONTROL, 140 PCCTWO_TT_CTRL_CEN | PCCTWO_TT_CTRL_COC | PCCTWO_TT_CTRL_COVF); 141 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER1_ICSR, sc->sc_clock_lvl); 142 143 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER2_CONTROL, PCCTWO_TT_CTRL_COVF); 144 pcc2_reg_write32(sys_pcctwo, PCC2REG_TIMER2_COUNTER, 0); 145 pcc2_reg_write32(sys_pcctwo, PCC2REG_TIMER2_COMPARE, 146 PCCTWO_US2LIM(stat_us)); 147 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER2_CONTROL, 148 PCCTWO_TT_CTRL_CEN | PCCTWO_TT_CTRL_COC | PCCTWO_TT_CTRL_COVF); 149 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER2_ICSR, sc->sc_clock_lvl); 150 151 sc->sc_tc.tc_get_timecount = clock_pcctwo_getcount; 152 sc->sc_tc.tc_name = "pcctwo_count"; 153 sc->sc_tc.tc_frequency = PCCTWO_TIMERFREQ; 154 sc->sc_tc.tc_quality = 100; 155 sc->sc_tc.tc_counter_mask = ~0; 156 tc_init(&sc->sc_tc); 157 } 158 159 /* ARGSUSED */ 160 u_int 161 clock_pcctwo_getcount(struct timecounter *tc) 162 { 163 u_int cnt; 164 uint32_t tc1, tc2; 165 uint8_t cr; 166 int s; 167 168 s = splhigh(); 169 170 /* 171 * There's no way to latch the counter and overflow registers 172 * without pausing the clock, so compensate for the possible 173 * race by checking for counter wrap-around and re-reading the 174 * overflow counter if necessary. 175 * 176 * Note: This only works because we're at splhigh(). 177 */ 178 tc1 = pcc2_reg_read32(sys_pcctwo, PCC2REG_TIMER1_COUNTER); 179 cr = pcc2_reg_read(sys_pcctwo, PCC2REG_TIMER1_CONTROL); 180 tc2 = pcc2_reg_read32(sys_pcctwo, PCC2REG_TIMER1_COUNTER); 181 if (tc1 > tc2) { 182 cr = pcc2_reg_read(sys_pcctwo, PCC2REG_TIMER1_CONTROL); 183 tc1 = tc2; 184 } 185 cnt = clock_pcctwo_count; 186 splx(s); 187 /* XXX assume HZ == 100 */ 188 cnt += tc1 + (PCCTWO_TIMERFREQ / 100) * PCCTWO_TT_CTRL_OVF(cr); 189 190 return cnt; 191 } 192 193 int 194 clock_pcctwo_profintr(void *frame) 195 { 196 u_int8_t cr; 197 u_int32_t tc; 198 int s; 199 200 s = splhigh(); 201 tc = pcc2_reg_read32(sys_pcctwo, PCC2REG_TIMER1_COUNTER); 202 cr = pcc2_reg_read(sys_pcctwo, PCC2REG_TIMER1_CONTROL); 203 if (tc > pcc2_reg_read32(sys_pcctwo, PCC2REG_TIMER1_COUNTER)) 204 cr = pcc2_reg_read(sys_pcctwo, PCC2REG_TIMER1_CONTROL); 205 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER1_CONTROL, 206 PCCTWO_TT_CTRL_CEN | PCCTWO_TT_CTRL_COC | PCCTWO_TT_CTRL_COVF); 207 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER1_ICSR, 208 clock_pcctwo_sc->sc_clock_lvl); 209 splx(s); 210 211 for (cr = PCCTWO_TT_CTRL_OVF(cr); cr; cr--) { 212 /* XXX assume HZ == 100 */ 213 clock_pcctwo_count += PCCTWO_TIMERFREQ / 100; 214 hardclock(frame); 215 } 216 217 return (1); 218 } 219 220 int 221 clock_pcctwo_statintr(void *frame) 222 { 223 224 /* Disable the timer interrupt while we handle it. */ 225 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER2_ICSR, 0); 226 227 statclock((struct clockframe *) frame); 228 229 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER2_CONTROL, PCCTWO_TT_CTRL_COVF); 230 pcc2_reg_write32(sys_pcctwo, PCC2REG_TIMER2_COUNTER, 0); 231 pcc2_reg_write32(sys_pcctwo, PCC2REG_TIMER2_COMPARE, 232 PCCTWO_US2LIM(CLOCK_NEWINT(clock_statvar, clock_statmin))); 233 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER2_CONTROL, 234 PCCTWO_TT_CTRL_CEN | PCCTWO_TT_CTRL_COC | PCCTWO_TT_CTRL_COVF); 235 236 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER2_ICSR, 237 clock_pcctwo_sc->sc_clock_lvl); 238 239 return (1); 240 } 241 242 /* ARGSUSED */ 243 void 244 clock_pcctwo_shutdown(void *arg) 245 { 246 247 /* Make sure the timer interrupts are turned off. */ 248 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER1_CONTROL, PCCTWO_TT_CTRL_COVF); 249 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER1_ICSR, 0); 250 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER2_CONTROL, PCCTWO_TT_CTRL_COVF); 251 pcc2_reg_write(sys_pcctwo, PCC2REG_TIMER2_ICSR, 0); 252 }
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