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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 | * Initialize beeper-related hardware. Initialize timer 1 for use with | |
39 | * the beeper. Use 66 Mhz internal clock with prescale of 33 to get | |
40 | * 1 uS period per count. | |
41 | * FIXME: we should really compute the prescale based on the reported | |
42 | * core clock frequency. | |
43 | */ | |
44 | void init_beeper (void) | |
45 | { | |
46 | volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; | |
47 | ||
48 | immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_RST1 | TGCR_STP1; | |
49 | immap->im_cpmtimer.cpmt_tmr1 = ((33 << TMR_PS_SHIFT) & TMR_PS_MSK) | |
50 | | TMR_OM | TMR_FRR | TMR_ICLK_IN_GEN; | |
51 | immap->im_cpmtimer.cpmt_tcn1 = 0; | |
52 | immap->im_cpmtimer.cpmt_ter1 = 0xffff; | |
53 | immap->im_cpmtimer.cpmt_tgcr |= TGCR_RST1; | |
54 | } | |
55 | ||
56 | /* | |
57 | * Set beeper frequency. Max allowed frequency is 2.5 KHz. This limit | |
58 | * is mostly arbitrary, but the beeper isn't really much good beyond this | |
59 | * frequency. | |
60 | */ | |
61 | void set_beeper_frequency (uint frequency) | |
62 | { | |
63 | #define FREQ_LIMIT 2500 | |
64 | ||
65 | volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; | |
66 | ||
67 | /* | |
68 | * Compute timer ticks given desired frequency. The timer is set up | |
69 | * to count 0.5 uS per tick and it takes two ticks per cycle (Hz). | |
70 | */ | |
71 | if (frequency > FREQ_LIMIT) | |
72 | frequency = FREQ_LIMIT; | |
73 | frequency = 1000000 / frequency; | |
74 | immap->im_cpmtimer.cpmt_trr1 = (ushort) frequency; | |
75 | } | |
76 | ||
77 | /* | |
78 | * Turn the beeper on | |
79 | */ | |
80 | void beeper_on (void) | |
81 | { | |
82 | volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; | |
83 | ||
84 | immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_STP1; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Turn the beeper off | |
89 | */ | |
90 | void beeper_off (void) | |
91 | { | |
92 | volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; | |
93 | ||
94 | immap->im_cpmtimer.cpmt_tgcr |= TGCR_STP1; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Increase or decrease the beeper volume. Volume can be set | |
99 | * from off to full in 64 steps. To increase volume, the output | |
100 | * pin is actively driven high, then returned to tristate. | |
101 | * To decrease volume, output a low on the port pin (no need to | |
102 | * change pin mode to tristate) then output a high to go back to | |
103 | * tristate. | |
104 | */ | |
105 | void set_beeper_volume (int steps) | |
106 | { | |
107 | volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR; | |
108 | int i; | |
109 | ||
110 | if (steps >= 0) { | |
111 | for (i = 0; i < (steps >= 64 ? 64 : steps); i++) { | |
112 | immap->im_cpm.cp_pbodr &= ~(0x80000000 >> 19); | |
113 | udelay (1); | |
114 | immap->im_cpm.cp_pbodr |= (0x80000000 >> 19); | |
115 | udelay (1); | |
116 | } | |
117 | } else { | |
118 | for (i = 0; i > (steps <= -64 ? -64 : steps); i--) { | |
119 | immap->im_cpm.cp_pbdat &= ~(0x80000000 >> 19); | |
120 | udelay (1); | |
121 | immap->im_cpm.cp_pbdat |= (0x80000000 >> 19); | |
122 | udelay (1); | |
123 | } | |
124 | } | |
125 | } | |
126 | ||
127 | /* | |
128 | * Check the environment to see if the beeper needs beeping. | |
129 | * Controlled by a sequence of the form: | |
130 | * freq/delta volume/on time/off time;... where: | |
131 | * freq = frequency in Hz (0 - 2500) | |
132 | * delta volume = volume steps up or down (-64 <= vol <= 64) | |
133 | * on time = time in mS | |
134 | * off time = time in mS | |
135 | * | |
136 | * Return 1 on success, 0 on failure | |
137 | */ | |
138 | int do_beeper (char *sequence) | |
139 | { | |
140 | #define DELIMITER ';' | |
141 | ||
142 | int args[4]; | |
143 | int i; | |
144 | int val; | |
145 | char *p = sequence; | |
146 | char *tp; | |
147 | ||
148 | /* | |
149 | * Parse the control sequence. This is a really simple parser | |
150 | * without any real error checking. You can probably blow it | |
151 | * up really easily. | |
152 | */ | |
153 | if (*p == '\0' || !isdigit (*p)) { | |
154 | printf ("%s:%d: null or invalid string (%s)\n", | |
155 | __FILE__, __LINE__, p); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | i = 0; | |
160 | while (*p != '\0') { | |
161 | while (*p != DELIMITER) { | |
162 | if (i > 3) | |
163 | i = 0; | |
164 | val = (int) simple_strtol (p, &tp, 0); | |
165 | if (tp == p) { | |
166 | printf ("%s:%d: no digits or bad format\n", | |
167 | __FILE__, __LINE__); | |
168 | return 0; | |
169 | } else { | |
170 | args[i] = val; | |
171 | } | |
172 | ||
173 | i++; | |
174 | if (*tp == DELIMITER) | |
175 | p = tp; | |
176 | else | |
177 | p = ++tp; | |
178 | } | |
179 | p++; | |
180 | ||
181 | /* | |
182 | * Well, we got something that has a chance of being correct | |
183 | */ | |
184 | #if 0 | |
185 | for (i = 0; i < 4; i++) { | |
186 | printf ("%s:%d:arg %d = %d\n", __FILE__, __LINE__, i, | |
187 | args[i]); | |
188 | } | |
189 | printf ("\n"); | |
190 | #endif | |
191 | set_beeper_frequency (args[0]); | |
192 | set_beeper_volume (args[1]); | |
193 | beeper_on (); | |
194 | udelay (1000 * args[2]); | |
195 | beeper_off (); | |
196 | udelay (1000 * args[3]); | |
197 | } | |
198 | return 1; | |
199 | } |