The frequency for the PC speaker has to be specified as
1193180 / frequency according to http://wiki.osdev.org/PC_Speaker
Change-Id: Iaca9d45807e080efe834611e719b350680b5fb90
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/337
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
*/
void speaker_enable(u16 freq)
{
*/
void speaker_enable(u16 freq)
{
+ u16 reg16 = 1193180 / freq;
+
/* Select counter 2. Read/write LSB first, then MSB. Use mode 3
(square wave generator). Use a 16bit binary counter. */
outb(0xb6, I82C54_CONTROL_WORD_REGISTER);
/* Set the desired tone frequency. */
/* Select counter 2. Read/write LSB first, then MSB. Use mode 3
(square wave generator). Use a 16bit binary counter. */
outb(0xb6, I82C54_CONTROL_WORD_REGISTER);
/* Set the desired tone frequency. */
- outb((u8)(freq & 0x00ff), I82C54_COUNTER2); /* LSB. */
- outb((u8)(freq >> 8), I82C54_COUNTER2); /* MSB. */
+ outb((u8)(reg16 & 0x00ff), I82C54_COUNTER2); /* LSB. */
+ outb((u8)(reg16 >> 8), I82C54_COUNTER2); /* MSB. */
/* Enable the PC speaker (set bits 0 and 1). */
outb(inb(PC_SPEAKER_PORT) | 0x03, PC_SPEAKER_PORT);
/* Enable the PC speaker (set bits 0 and 1). */
outb(inb(PC_SPEAKER_PORT) | 0x03, PC_SPEAKER_PORT);