mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-19 00:18:51 +09:00
214 lines
5.0 KiB
C
214 lines
5.0 KiB
C
/*
|
|
* (C) Copyright 2002
|
|
* Keith Outwater, keith_outwater@mvis.com
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <mpc8xx.h>
|
|
#include <asm/8xx_immap.h>
|
|
#include <linux/ctype.h>
|
|
|
|
/*
|
|
* Basic beeper support for the GEN860T board. The GEN860T includes
|
|
* an audio sounder driven by a Phillips TDA8551 amplifier. The
|
|
* TDA8551 features a digital volume control which uses a "trinary"
|
|
* input (high/high-Z/low) to set volume. The 860's SPKROUT pin
|
|
* drives the amplifier input.
|
|
*/
|
|
|
|
|
|
/*
|
|
* Initialize beeper-related hardware. Initialize timer 1 for use with
|
|
* the beeper. Use 66 Mhz internal clock with prescale of 33 to get
|
|
* 1 uS period per count.
|
|
* FIXME: we should really compute the prescale based on the reported
|
|
* core clock frequency.
|
|
*/
|
|
void
|
|
init_beeper(void)
|
|
{
|
|
volatile immap_t *immap = (immap_t *)CFG_IMMR;
|
|
|
|
immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_RST1 | TGCR_STP1;
|
|
immap->im_cpmtimer.cpmt_tmr1 = ((33 << TMR_PS_SHIFT) & TMR_PS_MSK)
|
|
| TMR_OM | TMR_FRR | TMR_ICLK_IN_GEN;
|
|
immap->im_cpmtimer.cpmt_tcn1 = 0;
|
|
immap->im_cpmtimer.cpmt_ter1 = 0xffff;
|
|
immap->im_cpmtimer.cpmt_tgcr |= TGCR_RST1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Set beeper frequency. Max allowed frequency is 2.5 KHz. This limit
|
|
* is mostly arbitrary, but the beeper isn't really much good beyond this
|
|
* frequency.
|
|
*/
|
|
void
|
|
set_beeper_frequency(uint frequency)
|
|
{
|
|
#define FREQ_LIMIT 2500
|
|
|
|
volatile immap_t *immap = (immap_t *)CFG_IMMR;
|
|
|
|
/*
|
|
* Compute timer ticks given desired frequency. The timer is set up
|
|
* to count 0.5 uS per tick and it takes two ticks per cycle (Hz).
|
|
*/
|
|
if (frequency > FREQ_LIMIT) frequency = FREQ_LIMIT;
|
|
frequency = 1000000/frequency;
|
|
immap->im_cpmtimer.cpmt_trr1 = (ushort)frequency;
|
|
}
|
|
|
|
|
|
/*
|
|
* Turn the beeper on
|
|
*/
|
|
void
|
|
beeper_on(void)
|
|
{
|
|
volatile immap_t *immap = (immap_t *)CFG_IMMR;
|
|
|
|
immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_STP1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Turn the beeper off
|
|
*/
|
|
void
|
|
beeper_off(void)
|
|
{
|
|
volatile immap_t *immap = (immap_t *)CFG_IMMR;
|
|
|
|
immap->im_cpmtimer.cpmt_tgcr |= TGCR_STP1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Increase or decrease the beeper volume. Volume can be set
|
|
* from off to full in 64 steps. To increase volume, the output
|
|
* pin is actively driven high, then returned to tristate.
|
|
* To decrease volume, output a low on the port pin (no need to
|
|
* change pin mode to tristate) then output a high to go back to
|
|
* tristate.
|
|
*/
|
|
void
|
|
set_beeper_volume(int steps)
|
|
{
|
|
volatile immap_t *immap = (immap_t *)CFG_IMMR;
|
|
int i;
|
|
|
|
if (steps >= 0) {
|
|
for (i = 0; i < (steps >= 64 ? 64 : steps); i++) {
|
|
immap->im_cpm.cp_pbodr &= ~(0x80000000 >> 19);
|
|
udelay(1);
|
|
immap->im_cpm.cp_pbodr |= (0x80000000 >> 19);
|
|
udelay(1);
|
|
}
|
|
}
|
|
else {
|
|
for (i = 0; i > (steps <= -64 ? -64 : steps); i--) {
|
|
immap->im_cpm.cp_pbdat &= ~(0x80000000 >> 19);
|
|
udelay(1);
|
|
immap->im_cpm.cp_pbdat |= (0x80000000 >> 19);
|
|
udelay(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Check the environment to see if the beeper needs beeping.
|
|
* Controlled by a sequence of the form:
|
|
* freq/delta volume/on time/off time;... where:
|
|
* freq = frequency in Hz (0 - 2500)
|
|
* delta volume = volume steps up or down (-64 <= vol <= 64)
|
|
* on time = time in mS
|
|
* off time = time in mS
|
|
*
|
|
* Return 1 on success, 0 on failure
|
|
*/
|
|
int
|
|
do_beeper(char *sequence)
|
|
{
|
|
#define DELIMITER ';'
|
|
|
|
int args[4];
|
|
int i;
|
|
int val;
|
|
char *p = sequence;
|
|
char *tp;
|
|
|
|
/*
|
|
* Parse the control sequence. This is a really simple parser
|
|
* without any real error checking. You can probably blow it
|
|
* up really easily.
|
|
*/
|
|
if (*p == '\0' || !isdigit(*p)) {
|
|
printf("%s:%d: null or invalid string (%s)\n",
|
|
__FILE__, __LINE__, p);
|
|
return 0;
|
|
}
|
|
|
|
i = 0;
|
|
while (*p != '\0') {
|
|
while (*p != DELIMITER) {
|
|
if (i > 3) i = 0;
|
|
val = (int) simple_strtol(p, &tp, 0);
|
|
if (tp == p) {
|
|
printf("%s:%d: no digits or bad format\n",
|
|
__FILE__,__LINE__);
|
|
return 0;
|
|
}
|
|
else {
|
|
args[i] = val;
|
|
}
|
|
|
|
i++;
|
|
if (*tp == DELIMITER)
|
|
p = tp;
|
|
else
|
|
p = ++tp;
|
|
}
|
|
p++;
|
|
|
|
/*
|
|
* Well, we got something that has a chance of being correct
|
|
*/
|
|
#if 0
|
|
for (i = 0; i < 4; i++) {
|
|
printf("%s:%d:arg %d = %d\n", __FILE__, __LINE__, i, args[i]);
|
|
}
|
|
printf("\n");
|
|
#endif
|
|
|
|
set_beeper_frequency(args[0]);
|
|
set_beeper_volume(args[1]);
|
|
beeper_on();
|
|
udelay(1000 * args[2]);
|
|
beeper_off();
|
|
udelay(1000 * args[3]);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* vim: set ts=4 sw=4 tw=78: */
|