Annotation of sys/arch/sparc64/dev/beep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: beep.c,v 1.3 2006/05/29 03:26:54 jason Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2006 Jason L. Wright (jason@thought.net)
! 5: * All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: *
! 16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
! 18: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
! 19: * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
! 20: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
! 21: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
! 22: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 23: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
! 24: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
! 25: * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 26: * POSSIBILITY OF SUCH DAMAGE.
! 27: */
! 28:
! 29: /*
! 30: * Driver for beeper device on BBC machines (Blade 1k, 2k, etc)
! 31: */
! 32:
! 33: #include <sys/types.h>
! 34: #include <sys/param.h>
! 35: #include <sys/systm.h>
! 36: #include <sys/kernel.h>
! 37: #include <sys/device.h>
! 38: #include <sys/conf.h>
! 39: #include <sys/timeout.h>
! 40:
! 41: #include <machine/bus.h>
! 42: #include <machine/autoconf.h>
! 43: #include <machine/openfirm.h>
! 44:
! 45: #include <sparc64/dev/ebusreg.h>
! 46: #include <sparc64/dev/ebusvar.h>
! 47:
! 48: #define BEEP_CTRL 0
! 49: #define BEEP_CNT_0 2
! 50: #define BEEP_CNT_1 3
! 51: #define BEEP_CNT_2 4
! 52: #define BEEP_CNT_3 5
! 53:
! 54: #define BEEP_CTRL_ON 0x01
! 55: #define BEEP_CTRL_OFF 0x00
! 56:
! 57: struct beep_freq {
! 58: int freq;
! 59: u_int32_t reg;
! 60: };
! 61:
! 62: struct beep_softc {
! 63: struct device sc_dev;
! 64: bus_space_tag_t sc_iot;
! 65: bus_space_handle_t sc_ioh;
! 66: int sc_clk;
! 67: struct beep_freq sc_freqs[9];
! 68: };
! 69:
! 70: int beep_match(struct device *, void *, void *);
! 71: void beep_attach(struct device *, struct device *, void *);
! 72: void beep_setfreq(struct beep_softc *, int);
! 73:
! 74: struct cfattach beep_ca = {
! 75: sizeof(struct beep_softc), beep_match, beep_attach
! 76: };
! 77:
! 78: struct cfdriver beep_cd = {
! 79: NULL, "beep", DV_DULL
! 80: };
! 81:
! 82: int
! 83: beep_match(struct device *parent, void *match, void *aux)
! 84: {
! 85: struct ebus_attach_args *ea = aux;
! 86:
! 87: if (strcmp(ea->ea_name, "beep") == 0)
! 88: return (1);
! 89: return (0);
! 90: }
! 91:
! 92: void
! 93: beep_attach(parent, self, aux)
! 94: struct device *parent, *self;
! 95: void *aux;
! 96: {
! 97: struct beep_softc *sc = (void *)self;
! 98: struct ebus_attach_args *ea = aux;
! 99: int i;
! 100:
! 101: sc->sc_iot = ea->ea_memtag;
! 102:
! 103: /* Use prom address if available, otherwise map it. */
! 104: if (ea->ea_nvaddrs) {
! 105: if (bus_space_map(sc->sc_iot, ea->ea_vaddrs[0], 0,
! 106: BUS_SPACE_MAP_PROMADDRESS, &sc->sc_ioh)) {
! 107: printf(": can't map PROM register space\n");
! 108: return;
! 109: }
! 110: } else if (ebus_bus_map(sc->sc_iot, 0,
! 111: EBUS_PADDR_FROM_REG(&ea->ea_regs[0]), ea->ea_regs[0].size, 0, 0,
! 112: &sc->sc_ioh) != 0) {
! 113: printf(": can't map register space\n");
! 114: return;
! 115: }
! 116:
! 117: /* The bbc,beep is clocked at half the BBC frequency */
! 118: sc->sc_clk = getpropint(findroot(), "clock-frequency", 0);
! 119: sc->sc_clk /= 2;
! 120:
! 121: /*
! 122: * Compute the frequence table based on the scalar and base
! 123: * board clock speed.
! 124: */
! 125: for (i = 0; i < 9; i++) {
! 126: sc->sc_freqs[i].reg = 1 << (18 - i);
! 127: sc->sc_freqs[i].freq = sc->sc_clk / sc->sc_freqs[i].reg;
! 128: }
! 129:
! 130: /* set beep at around 1200hz */
! 131: beep_setfreq(sc, 1200);
! 132:
! 133: bus_space_write_1(sc->sc_iot, sc->sc_ioh, BEEP_CTRL,
! 134: BEEP_CTRL_ON);
! 135: for (i = 0; i < 1000; i++)
! 136: DELAY(1000);
! 137: bus_space_write_1(sc->sc_iot, sc->sc_ioh, BEEP_CTRL,
! 138: BEEP_CTRL_OFF);
! 139:
! 140: printf(": clock %sMHz\n", clockfreq(sc->sc_clk));
! 141: }
! 142:
! 143: void
! 144: beep_setfreq(struct beep_softc *sc, int freq)
! 145: {
! 146: int i, n, selected = -1;
! 147:
! 148: n = sizeof(sc->sc_freqs)/sizeof(sc->sc_freqs[0]);
! 149:
! 150: if (freq < sc->sc_freqs[0].freq)
! 151: selected = 0;
! 152: if (freq > sc->sc_freqs[n - 1].freq)
! 153: selected = n - 1;
! 154:
! 155: for (i = 1; selected == -1 && i < n; i++) {
! 156: if (sc->sc_freqs[i].freq == freq)
! 157: selected = i;
! 158: else if (sc->sc_freqs[i].freq > freq) {
! 159: int diff1, diff2;
! 160:
! 161: diff1 = freq - sc->sc_freqs[i - 1].freq;
! 162: diff2 = sc->sc_freqs[i].freq - freq;
! 163: if (diff1 < diff2)
! 164: selected = i - 1;
! 165: else
! 166: selected = i;
! 167: }
! 168: }
! 169:
! 170: if (selected == -1)
! 171: selected = 0;
! 172:
! 173: bus_space_write_1(sc->sc_iot, sc->sc_ioh, BEEP_CNT_0,
! 174: (sc->sc_freqs[i].reg >> 24) & 0xff);
! 175: bus_space_write_1(sc->sc_iot, sc->sc_ioh, BEEP_CNT_1,
! 176: (sc->sc_freqs[i].reg >> 16) & 0xff);
! 177: bus_space_write_1(sc->sc_iot, sc->sc_ioh, BEEP_CNT_2,
! 178: (sc->sc_freqs[i].reg >> 8) & 0xff);
! 179: bus_space_write_1(sc->sc_iot, sc->sc_ioh, BEEP_CNT_3,
! 180: (sc->sc_freqs[i].reg >> 0) & 0xff);
! 181: }
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