mirror of
https://github.com/AsahiLinux/u-boot
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8ed44d91c8
Signed-off-by: Wolfgang Denk <wd@denx.de>
199 lines
5 KiB
C
199 lines
5 KiB
C
/*
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* (C) Copyright 2002
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* Keith Outwater, keith_outwater@mvis.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <mpc8xx.h>
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#include <asm/8xx_immap.h>
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#include <linux/ctype.h>
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/*
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* Basic beeper support for the GEN860T board. The GEN860T includes
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* an audio sounder driven by a Phillips TDA8551 amplifier. The
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* TDA8551 features a digital volume control which uses a "trinary"
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* input (high/high-Z/low) to set volume. The 860's SPKROUT pin
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* drives the amplifier input.
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*/
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/*
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* Initialize beeper-related hardware. Initialize timer 1 for use with
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* the beeper. Use 66 MHz internal clock with prescale of 33 to get
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* 1 uS period per count.
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* FIXME: we should really compute the prescale based on the reported
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* core clock frequency.
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*/
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void init_beeper (void)
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{
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volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
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immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_RST1 | TGCR_STP1;
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immap->im_cpmtimer.cpmt_tmr1 = ((33 << TMR_PS_SHIFT) & TMR_PS_MSK)
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| TMR_OM | TMR_FRR | TMR_ICLK_IN_GEN;
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immap->im_cpmtimer.cpmt_tcn1 = 0;
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immap->im_cpmtimer.cpmt_ter1 = 0xffff;
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immap->im_cpmtimer.cpmt_tgcr |= TGCR_RST1;
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}
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/*
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* Set beeper frequency. Max allowed frequency is 2.5 KHz. This limit
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* is mostly arbitrary, but the beeper isn't really much good beyond this
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* frequency.
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*/
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void set_beeper_frequency (uint frequency)
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{
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#define FREQ_LIMIT 2500
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volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
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/*
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* Compute timer ticks given desired frequency. The timer is set up
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* to count 0.5 uS per tick and it takes two ticks per cycle (Hz).
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*/
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if (frequency > FREQ_LIMIT)
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frequency = FREQ_LIMIT;
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frequency = 1000000 / frequency;
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immap->im_cpmtimer.cpmt_trr1 = (ushort) frequency;
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}
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/*
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* Turn the beeper on
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*/
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void beeper_on (void)
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{
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volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
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immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_STP1;
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}
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/*
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* Turn the beeper off
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*/
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void beeper_off (void)
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{
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volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
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immap->im_cpmtimer.cpmt_tgcr |= TGCR_STP1;
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}
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/*
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* Increase or decrease the beeper volume. Volume can be set
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* from off to full in 64 steps. To increase volume, the output
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* pin is actively driven high, then returned to tristate.
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* To decrease volume, output a low on the port pin (no need to
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* change pin mode to tristate) then output a high to go back to
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* tristate.
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*/
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void set_beeper_volume (int steps)
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{
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volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
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int i;
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if (steps >= 0) {
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for (i = 0; i < (steps >= 64 ? 64 : steps); i++) {
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immap->im_cpm.cp_pbodr &= ~(0x80000000 >> 19);
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udelay (1);
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immap->im_cpm.cp_pbodr |= (0x80000000 >> 19);
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udelay (1);
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}
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} else {
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for (i = 0; i > (steps <= -64 ? -64 : steps); i--) {
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immap->im_cpm.cp_pbdat &= ~(0x80000000 >> 19);
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udelay (1);
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immap->im_cpm.cp_pbdat |= (0x80000000 >> 19);
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udelay (1);
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}
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}
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}
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/*
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* Check the environment to see if the beeper needs beeping.
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* Controlled by a sequence of the form:
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* freq/delta volume/on time/off time;... where:
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* freq = frequency in Hz (0 - 2500)
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* delta volume = volume steps up or down (-64 <= vol <= 64)
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* on time = time in mS
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* off time = time in mS
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*
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* Return 1 on success, 0 on failure
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*/
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int do_beeper (char *sequence)
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{
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#define DELIMITER ';'
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int args[4];
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int i;
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int val;
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char *p = sequence;
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char *tp;
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/*
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* Parse the control sequence. This is a really simple parser
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* without any real error checking. You can probably blow it
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* up really easily.
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*/
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if (*p == '\0' || !isdigit (*p)) {
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printf ("%s:%d: null or invalid string (%s)\n",
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__FILE__, __LINE__, p);
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return 0;
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}
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i = 0;
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while (*p != '\0') {
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while (*p != DELIMITER) {
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if (i > 3)
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i = 0;
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val = (int) simple_strtol (p, &tp, 0);
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if (tp == p) {
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printf ("%s:%d: no digits or bad format\n",
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__FILE__, __LINE__);
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return 0;
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} else {
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args[i] = val;
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}
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i++;
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if (*tp == DELIMITER)
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p = tp;
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else
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p = ++tp;
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}
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p++;
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/*
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* Well, we got something that has a chance of being correct
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*/
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#if 0
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for (i = 0; i < 4; i++) {
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printf ("%s:%d:arg %d = %d\n", __FILE__, __LINE__, i,
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args[i]);
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}
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printf ("\n");
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#endif
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set_beeper_frequency (args[0]);
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set_beeper_volume (args[1]);
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beeper_on ();
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udelay (1000 * args[2]);
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beeper_off ();
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udelay (1000 * args[3]);
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}
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return 1;
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}
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