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/* Calypso DBB internal PWT (Pulse Width / T) Buzzer Driver */
/* (C) 2010 by Jose Pereira <onaips@gmail.com>
*
* All Rights Reserved
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <memory.h>
#define BASE_ADDR_PWL 0xfffe8800
#define PWT_REG(m) (BASE_ADDR_PWL + (m))
#define ASIC_CONF_REG 0xfffef008
#define BUZZ_LEVEL_REG 0xfffe480e
enum pwt_reg {
FRC_REG = 0,
VRC_REG = 1,
GCR_REG = 2,
};
#define ASCONF_PWT_ENA (1 << 5)
void buzzer_mode_pwt(int on)
{
uint16_t reg;
reg = readw(ASIC_CONF_REG);
if (on) {
/* Enable pwt */
writeb(0x01, PWT_REG(GCR_REG));
/* Switch pin from LT to PWL */
reg |= ASCONF_PWT_ENA;
writew(reg, ASIC_CONF_REG);
} else {
/* Switch pin from PWT to BU */
reg |= ~ASCONF_PWT_ENA;
writew(reg, ASIC_CONF_REG);
/* Disable pwt */
writeb(0x00, PWT_REG(GCR_REG));
}
}
void buzzer_volume(uint8_t level)
{
if (readw(ASIC_CONF_REG) & ASCONF_PWT_ENA) {
if (level) {
//scaling the volume as pwt only knows 0..63
level = level >> 1;
//if level > 0 buzzer is on
level |= 0x01;
}
writeb(level,PWT_REG(VRC_REG));
} else {
/* we need to scale the buzz level, as the
* ARMIO buzz controller only knows 0..63 */
writeb(level>>2, BUZZ_LEVEL_REG);
}
}
void buzzer_note(uint8_t note)
{
if ( (readw(ASIC_CONF_REG) & ASCONF_PWT_ENA) )
writeb(note,PWT_REG(FRC_REG));
}
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