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/**
* rt_com
* ======
*
* RT-Linux kernel module for communication across serial lines.
*
* Copyright (C) 1997 Jens Michaelsen
* Copyright (C) 1997-1999 Jochen Kpper
* Copyright (C) 1999 Hua Mao <hmao@nmt.edu>
*/
#ifndef RT_COM_P_H
#define RT_COM_P_H
/* private functions */
#ifdef RTLINUX_V1
static void rt_com0_isr( void );
static inline void rt_com_isr( unsigned int );
#else
static unsigned int rt_com0_isr( unsigned int, struct pt_regs * );
static unsigned int rt_com_isr( unsigned int, struct pt_regs * );
#endif
/* number of bytes in port FIFO when a DATA_READY interrupt shall occur */
#define FIFO_TRIGGER 8
/* status masks */
#define DATA_READY 0x01 /* not an error */
#define OVERRUN 0x02 /* error detected by hardware */
#define PARITY 0x04 /* error detected by hardware */
#define FRAME 0x08 /* error detected by hardware */
#define BREAK 0x10 /* not an error */
#define BUFFER_FULL 0x80 /* error detected by software */
#define TXB_EMPTY 0x20 /* not an error */
#define HARD_ERROR (OVERRUN | PARITY | FRAME | BREAK)
/* port register offsets */
#define RT_COM_RXB 0x00
#define RT_COM_TXB 0x00
#define RT_COM_IER 0x01
#define RT_COM_IIR 0x02
#define RT_COM_FCR 0x02
#define RT_COM_LCR 0x03
#define RT_COM_MCR 0x04
#define RT_COM_LSR 0x05
#define RT_COM_MSR 0x06
#define RT_COM_DLL 0x00
#define RT_COM_DLM 0x01
/* bit masks which may be written to the MCR using ModemControl */
#define RT_COM_DTR 0x01 /* data Terminal Ready */
#define RT_COM_RTS 0x02 /* Request To Send */
#define RT_COM_Out1 0x04
#define RT_COM_Out2 0x08
#define RT_COM_LoopBack 0x10
/* data buffer - organized as a FIFO */
struct rt_buf_struct{
int head;
int tail;
char buf[ RT_COM_BUF_SIZ ];
};
#ifdef CONFIG_SMP
spinlock_t rt_com_spinlock = SPIN_LOCK_UNLOCKED;
#define RTL_SPIN_LOCK rt_com_spinlock
#endif
#define rt_com_irq_off( state ) rtl_critical( state )
#define rt_com_irq_on(state) rtl_end_critical( state )
/* information about handled ports */
struct rt_com_struct{
int magic;
int baud_base;
int port;
int irq;
int flag;
#ifdef RTLINUX_V1
void (*isr)(void);
#else
unsigned int (*isr)( unsigned int num, struct pt_regs *r);
#endif
int type;
int ier; /* copy of chip register */
struct rt_buf_struct ibuf;
struct rt_buf_struct obuf;
};
/*-----------------------------------------------------------------------*/
#define BASE_BAUD 115200
#define STD_COM_FLAG 0
#endif /* RT_COM_P_H */
/**
* Local Variables:
* mode: C
* c-file-style: "Stroustrup"
* End:
*/
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