nuclear@0: #ifndef PIT8254_H_
nuclear@0: #define PIT8254_H_
nuclear@0: 
nuclear@0: /* frequency of the oscillator driving the 8254 timer */
nuclear@0: #define OSC_FREQ_HZ		1193182
nuclear@0: 
nuclear@0: /* I/O ports connected to the 8254 */
nuclear@0: #define PORT_DATA0	0x40
nuclear@0: #define PORT_DATA1	0x41
nuclear@0: #define PORT_DATA2	0x42
nuclear@0: #define PORT_CMD	0x43
nuclear@0: 
nuclear@0: /* command bits */
nuclear@0: #define CMD_CHAN0			0
nuclear@0: #define CMD_CHAN1			(1 << 6)
nuclear@0: #define CMD_CHAN2			(2 << 6)
nuclear@0: #define CMD_RDBACK			(3 << 6)
nuclear@0: 
nuclear@0: #define CMD_LATCH			0
nuclear@0: #define CMD_ACCESS_LOW		(1 << 4)
nuclear@0: #define CMD_ACCESS_HIGH		(2 << 4)
nuclear@0: #define CMD_ACCESS_BOTH		(3 << 4)
nuclear@0: 
nuclear@0: #define CMD_OP_INT_TERM		0
nuclear@0: #define CMD_OP_ONESHOT		(1 << 1)
nuclear@0: #define CMD_OP_RATE			(2 << 1)
nuclear@0: #define CMD_OP_SQWAVE		(3 << 1)
nuclear@0: #define CMD_OP_SW_STROBE	(4 << 1)
nuclear@0: #define CMD_OP_HW_STROBE	(5 << 1)
nuclear@0: 
nuclear@0: #define CMD_MODE_BIN		0
nuclear@0: #define CMD_MODE_BCD		1
nuclear@0: 
nuclear@0: #endif	/* PIT8254_H_ */