sbtimer.c revision 1.4
1/* $NetBSD: sbtimer.c,v 1.4 2002/06/27 04:09:15 simonb Exp $ */ 2 3/* 4 * Copyright 2000, 2001 5 * Broadcom Corporation. All rights reserved. 6 * 7 * This software is furnished under license and may be used and copied only 8 * in accordance with the following terms and conditions. Subject to these 9 * conditions, you may download, copy, install, use, modify and distribute 10 * modified or unmodified copies of this software in source and/or binary 11 * form. No title or ownership is transferred hereby. 12 * 13 * 1) Any source code used, modified or distributed must reproduce and 14 * retain this copyright notice and list of conditions as they appear in 15 * the source file. 16 * 17 * 2) No right is granted to use any trade name, trademark, or logo of 18 * Broadcom Corporation. Neither the "Broadcom Corporation" name nor any 19 * trademark or logo of Broadcom Corporation may be used to endorse or 20 * promote products derived from this software without the prior written 21 * permission of Broadcom Corporation. 22 * 23 * 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR 26 * NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM BE LIABLE 27 * FOR ANY DAMAGES WHATSOEVER, AND IN PARTICULAR, BROADCOM SHALL NOT BE 28 * LIABLE FOR DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 33 * OR OTHERWISE), EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36#include <sys/param.h> 37#include <sys/device.h> 38#include <sys/systm.h> 39#include <sys/kernel.h> 40 41#include <mips/locore.h> 42 43#include <mips/sibyte/include/sb1250_regs.h> 44#include <mips/sibyte/include/sb1250_scd.h> 45#include <mips/sibyte/dev/sbscdvar.h> 46 47struct sbtimer_softc { 48 struct device sc_dev; 49 void *sc_intrhand; 50 int sc_flags; 51 void *sc_addr_icnt, *sc_addr_cnt, *sc_addr_cfg; 52}; 53#define SBTIMER_CLOCK 1 54#define SBTIMER_STATCLOCK 2 55 56#define READ_REG(rp) (mips3_ld((uint64_t *)(rp))) 57#define WRITE_REG(rp, val) (mips3_sd((uint64_t *)(rp), (val))) 58 59static int sbtimer_match(struct device *, struct cfdata *, void *); 60static void sbtimer_attach(struct device *, struct device *, void *); 61 62struct cfattach sbtimer_ca = { 63 sizeof(struct sbtimer_softc), sbtimer_match, sbtimer_attach 64}; 65 66static void sbtimer_clockintr(void *arg, uint32_t status, uint32_t pc); 67static void sbtimer_statclockintr(void *arg, uint32_t status, 68 uint32_t pc); 69static void sbtimer_miscintr(void *arg, uint32_t status, uint32_t pc); 70 71static void sbtimer_clock_init(void *arg); 72 73static int 74sbtimer_match(struct device *parent, struct cfdata *match, void *aux) 75{ 76 struct sbscd_attach_args *sap = aux; 77 78 if (sap->sa_locs.sa_type != SBSCD_DEVTYPE_TIMER) 79 return (0); 80 81 return 1; 82} 83 84static void 85sbtimer_attach(struct device *parent, struct device *self, void *aux) 86{ 87 struct sbscd_attach_args *sa = aux; 88 struct sbtimer_softc *sc = (struct sbtimer_softc *)self; 89 void (*fun)(void *, uint32_t, uint32_t); 90 int ipl; 91 const char *comment = ""; 92 93 sc->sc_flags = sc->sc_dev.dv_cfdata->cf_flags; 94 sc->sc_addr_icnt = (uint64_t *)MIPS_PHYS_TO_KSEG1(sa->sa_base + 95 sa->sa_locs.sa_offset + R_SCD_TIMER_INIT); 96 sc->sc_addr_cnt = (uint64_t *)MIPS_PHYS_TO_KSEG1(sa->sa_base + 97 sa->sa_locs.sa_offset + R_SCD_TIMER_CNT); 98 sc->sc_addr_cfg = (uint64_t *)MIPS_PHYS_TO_KSEG1(sa->sa_base + 99 sa->sa_locs.sa_offset + R_SCD_TIMER_CFG); 100 101 printf(": "); 102 if ((sc->sc_flags & SBTIMER_CLOCK) != 0) { 103 ipl = IPL_CLOCK; 104 fun = sbtimer_clockintr; 105 106 if (system_set_clockfns(sc, sbtimer_clock_init)) { 107 /* not really the clock */ 108 sc->sc_flags &= ~SBTIMER_CLOCK; 109 comment = " (not system timer)"; 110 goto not_really; 111 } 112 printf("system timer"); 113 } else if ((sc->sc_flags & SBTIMER_STATCLOCK) != 0) { 114 ipl = IPL_STATCLOCK; 115 fun = sbtimer_statclockintr; 116 117 /* XXX make sure it's the statclock */ 118 if (1) { 119 /* not really the statclock */ 120 sc->sc_flags &= ~SBTIMER_STATCLOCK; 121 comment = " (not system statistics timer)"; 122 goto not_really; 123 } 124 printf("system statistics timer"); 125 } else { 126not_really: 127 ipl = IPL_BIO; /* XXX -- pretty low */ 128 fun = sbtimer_miscintr; 129 printf("general-purpose timer%s", comment); 130 } 131 printf("\n"); 132 133 /* clear intr & disable timer. */ 134 WRITE_REG(sc->sc_addr_cfg, 0x00); /* XXX */ 135 136 sc->sc_intrhand = cpu_intr_establish(sa->sa_locs.sa_intr[0], ipl, 137 fun, sc); 138} 139 140static void 141sbtimer_clock_init(void *arg) 142{ 143 struct sbtimer_softc *sc = arg; 144 145 printf("%s: ", sc->sc_dev.dv_xname); 146 if ((1000000 % hz) == 0) 147 printf("%dHz system timer\n", hz); 148 else { 149 printf("cannot get %dHz clock; using 1000Hz\n", hz); 150 hz = 1000; 151 tick = 1000000 / hz; 152 } 153 154 WRITE_REG(sc->sc_addr_cfg, 0x00); /* XXX */ 155 if (G_SYS_PLL_DIV(READ_REG(MIPS_PHYS_TO_KSEG1(A_SCD_SYSTEM_CFG))) == 0) { 156 printf("%s: PLL_DIV == 0; speeding up clock ticks for simulator\n", 157 sc->sc_dev.dv_xname); 158 WRITE_REG(sc->sc_addr_icnt, (tick/100) - 1); /* XXX */ 159 } else { 160 WRITE_REG(sc->sc_addr_icnt, tick - 1); /* XXX */ 161 } 162 WRITE_REG(sc->sc_addr_cfg, 0x03); /* XXX */ 163} 164 165static void 166sbtimer_clockintr(void *arg, uint32_t status, uint32_t pc) 167{ 168 struct sbtimer_softc *sc = arg; 169 struct clockframe cf; 170 171 /* clear interrupt, but leave timer enabled and in repeating mode */ 172 WRITE_REG(sc->sc_addr_cfg, 0x03); /* XXX */ 173 174 cf.pc = pc; 175 cf.sr = status; 176 177 /* reset the CPU count register (used by microtime) */ 178 mips3_cp0_count_write(0); 179 180 hardclock(&cf); 181} 182 183static void 184sbtimer_statclockintr(void *arg, uint32_t status, uint32_t pc) 185{ 186 struct sbtimer_softc *sc = arg; 187 struct clockframe cf; 188 189 /* clear intr & disable timer, reset initial count, re-enable timer */ 190 WRITE_REG(sc->sc_addr_cfg, 0x00); /* XXX */ 191 /* XXX more to do */ 192 193 cf.pc = pc; 194 cf.sr = status; 195 196 statclock(&cf); 197} 198 199static void 200sbtimer_miscintr(void *arg, uint32_t status, uint32_t pc) 201{ 202 struct sbtimer_softc *sc = arg; 203 204 /* disable timer */ 205 WRITE_REG(sc->sc_addr_cfg, 0x00); /* XXX */ 206 207 /* XXX more to do */ 208} 209