/* * (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. */voidinit_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. */voidset_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 */voidbeeper_on(void){    volatile immap_t *immap  = (immap_t *)CFG_IMMR;	immap->im_cpmtimer.cpmt_tgcr &= ~TGCR_STP1;}/* * Turn the beeper off */voidbeeper_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. */voidset_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 */intdo_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: */