sbtimer.c revision 1.3
1/* $NetBSD: sbtimer.c,v 1.3 2002/03/06 07:47:57 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 73int printticks = 0; 74 75static int 76sbtimer_match(struct device *parent, struct cfdata *match, void *aux) 77{ 78 struct sbscd_attach_args *sap = aux; 79 80 if (sap->sa_locs.sa_type != SBSCD_DEVTYPE_TIMER) 81 return (0); 82 83 return 1; 84} 85 86static void 87sbtimer_attach(struct device *parent, struct device *self, void *aux) 88{ 89 struct sbscd_attach_args *sa = aux; 90 struct sbtimer_softc *sc = (struct sbtimer_softc *)self; 91 void (*fun)(void *, uint32_t, uint32_t); 92 int ipl; 93 const char *comment = ""; 94 95 sc->sc_flags = sc->sc_dev.dv_cfdata->cf_flags; 96 sc->sc_addr_icnt = (uint64_t *)MIPS_PHYS_TO_KSEG1(sa->sa_base + 97 sa->sa_locs.sa_offset + R_SCD_TIMER_INIT); 98 sc->sc_addr_cnt = (uint64_t *)MIPS_PHYS_TO_KSEG1(sa->sa_base + 99 sa->sa_locs.sa_offset + R_SCD_TIMER_CNT); 100 sc->sc_addr_cfg = (uint64_t *)MIPS_PHYS_TO_KSEG1(sa->sa_base + 101 sa->sa_locs.sa_offset + R_SCD_TIMER_CFG); 102 103 printf(": "); 104 if ((sc->sc_flags & SBTIMER_CLOCK) != 0) { 105 ipl = IPL_CLOCK; 106 fun = sbtimer_clockintr; 107 108 if (system_set_clockfns(sc, sbtimer_clock_init)) { 109 /* not really the clock */ 110 sc->sc_flags &= ~SBTIMER_CLOCK; 111 comment = " (not system timer)"; 112 goto not_really; 113 } 114 printf("system timer"); 115 } else if ((sc->sc_flags & SBTIMER_STATCLOCK) != 0) { 116 ipl = IPL_STATCLOCK; 117 fun = sbtimer_statclockintr; 118 119 /* XXX make sure it's the statclock */ 120 if (1) { 121 /* not really the statclock */ 122 sc->sc_flags &= ~SBTIMER_STATCLOCK; 123 comment = " (not system statistics timer)"; 124 goto not_really; 125 } 126 printf("system statistics timer"); 127 } else { 128not_really: 129 ipl = IPL_BIO; /* XXX -- pretty low */ 130 fun = sbtimer_miscintr; 131 printf("general-purpose timer%s", comment); 132 } 133 printf("\n"); 134 135 /* clear intr & disable timer. */ 136 WRITE_REG(sc->sc_addr_cfg, 0x00); /* XXX */ 137 138 sc->sc_intrhand = cpu_intr_establish(sa->sa_locs.sa_intr[0], ipl, 139 fun, sc); 140} 141 142static void 143sbtimer_clock_init(void *arg) 144{ 145 struct sbtimer_softc *sc = arg; 146 147 printf("%s: ", sc->sc_dev.dv_xname); 148 if ((1000000 % hz) == 0) 149 printf("%dHz system timer\n", hz); 150 else { 151 printf("cannot get %dHz clock; using 1000Hz\n", hz); 152 hz = 1000; 153 tick = 1000000 / hz; 154 } 155 156 WRITE_REG(sc->sc_addr_cfg, 0x00); /* XXX */ 157 if (G_SYS_PLL_DIV(READ_REG(MIPS_PHYS_TO_KSEG1(A_SCD_SYSTEM_CFG))) == 0) { 158 printf("%s: PLL_DIV == 0; speeding up clock ticks for simulator\n", 159 sc->sc_dev.dv_xname); 160 WRITE_REG(sc->sc_addr_icnt, (tick/100) - 1); /* XXX */ 161 } else { 162 WRITE_REG(sc->sc_addr_icnt, tick - 1); /* XXX */ 163 } 164 WRITE_REG(sc->sc_addr_cfg, 0x03); /* XXX */ 165} 166 167static void 168sbtimer_clockintr(void *arg, uint32_t status, uint32_t pc) 169{ 170 struct sbtimer_softc *sc = arg; 171 struct clockframe cf; 172 173 /* clear interrupt, but leave timer enabled and in repeating mode */ 174 WRITE_REG(sc->sc_addr_cfg, 0x03); /* XXX */ 175 176 if (printticks) 177 printf("+"); 178 cf.pc = pc; 179 cf.sr = status; 180 181 /* reset the CPU count register (used by microtime) */ 182 mips3_cp0_count_write(0); 183 184 hardclock(&cf); 185} 186 187static void 188sbtimer_statclockintr(void *arg, uint32_t status, uint32_t pc) 189{ 190 struct sbtimer_softc *sc = arg; 191 struct clockframe cf; 192 193 /* clear intr & disable timer, reset initial count, re-enable timer */ 194 WRITE_REG(sc->sc_addr_cfg, 0x00); /* XXX */ 195 /* XXX more to do */ 196 197 cf.pc = pc; 198 cf.sr = status; 199 200 statclock(&cf); 201} 202 203static void 204sbtimer_miscintr(void *arg, uint32_t status, uint32_t pc) 205{ 206 struct sbtimer_softc *sc = arg; 207 208 /* disable timer */ 209 WRITE_REG(sc->sc_addr_cfg, 0x00); /* XXX */ 210 211 /* XXX more to do */ 212} 213