i8254.h

#ifndef _LCOM_I8254_H_
#define _LCOM_I8254_H_

#define TIMER_FREQ  1193182    
#define BIT(n) (0x01<<(n))

#define TIMER0_IRQ              0    
/* I/O port addresses */

#define TIMER_0                 0x40 
#define TIMER_1                 0x41 
#define TIMER_2                 0x42 
#define TIMER_CTRL              0x43 
#define SPEAKER_CTRL            0x61 
/* Timer control */

/* Timer selection: bits 7 and 6 */

#define TIMER_SEL0              0x00     
#define TIMER_SEL1              BIT(6)   
#define TIMER_SEL2              BIT(7)   
#define TIMER_RB_CMD            (BIT(7)|BIT(6))  
/* Register selection: bits 5 and 4 */

#define TIMER_LSB               BIT(4)  
#define TIMER_MSB               BIT(5)  
#define TIMER_LSB_MSB           (TIMER_LSB | TIMER_MSB) 
/* Operating mode: bits 3, 2 and 1 */

#define TIMER_SQR_WAVE          (BIT(2)|BIT(1)) 
#define TIMER_RATE_GEN          BIT(2)          
/* Counting mode: bit 0 */

#define TIMER_BCD                       0x01   
#define TIMER_BIN                       0x00   
/* READ-BACK COMMAND FORMAT */

#define TIMER_RB_COUNT_         BIT(5)
#define TIMER_RB_STATUS_        BIT(4)
#define TIMER_RB_SEL(n)         BIT((n)+1)


#endif /* _LCOM_I8254_H */