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c609719b WD |
1 | /* |
2 | * (C) Copyright 2002 | |
3 | * Keith Outwater, keith_outwater@mvis.com | |
4 | * | |
5 | * See file CREDITS for list of people who contributed to this | |
6 | * project. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
21 | * MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | #include <common.h> | |
25 | #include <mpc8xx.h> | |
26 | #include <asm/8xx_immap.h> | |
27 | #include <linux/ctype.h> | |
28 | ||
29 | /* | |
30 | * Basic beeper support for the GEN860T board. The GEN860T includes | |
31 | * an audio sounder driven by a Phillips TDA8551 amplifier. The | |
32 | * TDA8551 features a digital volume control which uses a "trinary" | |
33 | * input (high/high-Z/low) to set volume. The 860's SPKROUT pin | |
34 | * drives the amplifier input. | |
35 | */ | |
36 | ||
37 | ||
38 | /* | |
39 | * Initialize beeper-related hardware. Initialize timer 1 for use with | |
40 | * the beeper. Use 66 Mhz internal clock with prescale of 33 to get | |
41 | * 1 uS period per count. | |
42 | * FIXME: we should really compute the prescale based on the reported | |
43 | * core clock frequency. | |
44 | */ | |
45 | void | |
46 | init_beeper(void) | |
47 | { | |
48 | volatile immap_t *immap = (immap_t *)CFG_IMMR; | |
49 | ||
50 | immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_RST1 | TGCR_STP1; | |
51 | immap->im_cpmtimer.cpmt_tmr1 = ((33 << TMR_PS_SHIFT) & TMR_PS_MSK) | |
52 | | TMR_OM | TMR_FRR | TMR_ICLK_IN_GEN; | |
53 | immap->im_cpmtimer.cpmt_tcn1 = 0; | |
54 | immap->im_cpmtimer.cpmt_ter1 = 0xffff; | |
55 | immap->im_cpmtimer.cpmt_tgcr |= TGCR_RST1; | |
56 | } | |
57 | ||
58 | ||
59 | /* | |
60 | * Set beeper frequency. Max allowed frequency is 2.5 KHz. This limit | |
61 | * is mostly arbitrary, but the beeper isn't really much good beyond this | |
62 | * frequency. | |
63 | */ | |
64 | void | |
65 | set_beeper_frequency(uint frequency) | |
66 | { | |
67 | #define FREQ_LIMIT 2500 | |
68 | ||
69 | volatile immap_t *immap = (immap_t *)CFG_IMMR; | |
70 | ||
71 | /* | |
72 | * Compute timer ticks given desired frequency. The timer is set up | |
73 | * to count 0.5 uS per tick and it takes two ticks per cycle (Hz). | |
74 | */ | |
75 | if (frequency > FREQ_LIMIT) frequency = FREQ_LIMIT; | |
76 | frequency = 1000000/frequency; | |
77 | immap->im_cpmtimer.cpmt_trr1 = (ushort)frequency; | |
78 | } | |
79 | ||
80 | ||
81 | /* | |
82 | * Turn the beeper on | |
83 | */ | |
84 | void | |
85 | beeper_on(void) | |
86 | { | |
87 | volatile immap_t *immap = (immap_t *)CFG_IMMR; | |
88 | ||
89 | immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_STP1; | |
90 | } | |
91 | ||
92 | ||
93 | /* | |
94 | * Turn the beeper off | |
95 | */ | |
96 | void | |
97 | beeper_off(void) | |
98 | { | |
99 | volatile immap_t *immap = (immap_t *)CFG_IMMR; | |
100 | ||
101 | immap->im_cpmtimer.cpmt_tgcr |= TGCR_STP1; | |
102 | } | |
103 | ||
104 | ||
105 | /* | |
106 | * Increase or decrease the beeper volume. Volume can be set | |
107 | * from off to full in 64 steps. To increase volume, the output | |
108 | * pin is actively driven high, then returned to tristate. | |
109 | * To decrease volume, output a low on the port pin (no need to | |
110 | * change pin mode to tristate) then output a high to go back to | |
111 | * tristate. | |
112 | */ | |
113 | void | |
114 | set_beeper_volume(int steps) | |
115 | { | |
116 | volatile immap_t *immap = (immap_t *)CFG_IMMR; | |
117 | int i; | |
118 | ||
119 | if (steps >= 0) { | |
120 | for (i = 0; i < (steps >= 64 ? 64 : steps); i++) { | |
121 | immap->im_cpm.cp_pbodr &= ~(0x80000000 >> 19); | |
122 | udelay(1); | |
123 | immap->im_cpm.cp_pbodr |= (0x80000000 >> 19); | |
124 | udelay(1); | |
125 | } | |
126 | } | |
127 | else { | |
128 | for (i = 0; i > (steps <= -64 ? -64 : steps); i--) { | |
129 | immap->im_cpm.cp_pbdat &= ~(0x80000000 >> 19); | |
130 | udelay(1); | |
131 | immap->im_cpm.cp_pbdat |= (0x80000000 >> 19); | |
132 | udelay(1); | |
133 | } | |
134 | } | |
135 | } | |
136 | ||
137 | ||
138 | /* | |
139 | * Check the environment to see if the beeper needs beeping. | |
140 | * Controlled by a sequence of the form: | |
141 | * freq/delta volume/on time/off time;... where: | |
142 | * freq = frequency in Hz (0 - 2500) | |
143 | * delta volume = volume steps up or down (-64 <= vol <= 64) | |
144 | * on time = time in mS | |
145 | * off time = time in mS | |
146 | * | |
147 | * Return 1 on success, 0 on failure | |
148 | */ | |
149 | int | |
150 | do_beeper(char *sequence) | |
151 | { | |
152 | #define DELIMITER ';' | |
153 | ||
154 | int args[4]; | |
155 | int i; | |
156 | int val; | |
157 | char *p = sequence; | |
158 | char *tp; | |
159 | ||
160 | /* | |
161 | * Parse the control sequence. This is a really simple parser | |
162 | * without any real error checking. You can probably blow it | |
163 | * up really easily. | |
164 | */ | |
165 | if (*p == '\0' || !isdigit(*p)) { | |
166 | printf("%s:%d: null or invalid string (%s)\n", | |
167 | __FILE__, __LINE__, p); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | i = 0; | |
172 | while (*p != '\0') { | |
173 | while (*p != DELIMITER) { | |
174 | if (i > 3) i = 0; | |
175 | val = (int) simple_strtol(p, &tp, 0); | |
176 | if (tp == p) { | |
177 | printf("%s:%d: no digits or bad format\n", | |
178 | __FILE__,__LINE__); | |
179 | return 0; | |
180 | } | |
181 | else { | |
182 | args[i] = val; | |
183 | } | |
184 | ||
185 | i++; | |
186 | if (*tp == DELIMITER) | |
187 | p = tp; | |
188 | else | |
189 | p = ++tp; | |
190 | } | |
191 | p++; | |
192 | ||
193 | /* | |
194 | * Well, we got something that has a chance of being correct | |
195 | */ | |
196 | #if 0 | |
197 | for (i = 0; i < 4; i++) { | |
198 | printf("%s:%d:arg %d = %d\n", __FILE__, __LINE__, i, args[i]); | |
199 | } | |
200 | printf("\n"); | |
201 | #endif | |
202 | ||
203 | set_beeper_frequency(args[0]); | |
204 | set_beeper_volume(args[1]); | |
205 | beeper_on(); | |
206 | udelay(1000 * args[2]); | |
207 | beeper_off(); | |
208 | udelay(1000 * args[3]); | |
209 | } | |
210 | return 1; | |
211 | } | |
212 | ||
213 | /* vim: set ts=4 sw=4 tw=78: */ |