Annotation of sys/arch/sparc64/dev/beep.c, Revision 1.1.1.1
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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