mn10300-serial.h

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/* MN10300 On-chip serial port driver definitions
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#ifndef _MN10300_SERIAL_H
#define _MN10300_SERIAL_H

#ifndef __ASSEMBLY__
#include <linux/serial_core.h>
#include <linux/termios.h>
#endif

#include <asm/page.h>
#include <asm/serial-regs.h>

#define NR_PORTS        3       /* should be set 3 or 9 or 16 */

#define MNSC_BUFFER_SIZE    +(PAGE_SIZE / 2)

/* intr_flags bits */
#define MNSCx_RX_AVAIL      0x01
#define MNSCx_RX_OVERF      0x02
#define MNSCx_TX_SPACE      0x04
#define MNSCx_TX_EMPTY      0x08

#ifndef __ASSEMBLY__

struct mn10300_serial_port {
    char            *rx_buffer; /* reception buffer base */
    unsigned        rx_inp;     /* pointer to rx input offset */
    unsigned        rx_outp;    /* pointer to rx output offset */
    u8          tx_xchar;   /* high-priority XON/XOFF buffer */
    u8          tx_break;   /* transmit break request */
    u8          intr_flags; /* interrupt flags */
    volatile u16        *rx_icr;    /* Rx interrupt control register */
    volatile u16        *tx_icr;    /* Tx interrupt control register */
    int         rx_irq;     /* reception IRQ */
    int         tx_irq;     /* transmission IRQ */
    int         tm_irq;     /* timer IRQ */

    const char      *name;      /* name of serial port */
    const char      *rx_name;   /* Rx interrupt handler name of serial port */
    const char      *tx_name;   /* Tx interrupt handler name of serial port */
    const char      *tm_name;   /* Timer interrupt handler name */
    unsigned short      type;       /* type of serial port */
    unsigned char       isconsole;  /* T if it's a console */
    volatile void       *_iobase;   /* pointer to base of I/O control regs */
    volatile u16        *_control;  /* control register pointer */
    volatile u8     *_status;   /* status register pointer */
    volatile u8     *_intr;     /* interrupt register pointer */
    volatile void       *_rxb;      /* receive buffer register pointer */
    volatile void       *_txb;      /* transmit buffer register pointer */
    volatile u16        *_tmicr;    /* timer interrupt control register */
    volatile u8     *_tmxmd;    /* baud rate timer mode register */
    volatile u16        *_tmxbr;    /* baud rate timer base register */

    /* this must come down here so that assembly can use BSET to access the
     * above fields */
    struct uart_port    uart;

    unsigned short      rx_brk;     /* current break reception status */
    u16         tx_cts;     /* current CTS status */
    int         gdbstub;    /* preemptively stolen by GDB stub */

    u8          clock_src;  /* clock source */
#define MNSCx_CLOCK_SRC_IOCLK   0
#define MNSCx_CLOCK_SRC_IOBCLK  1

    u8          div_timer;  /* timer used as divisor */
#define MNSCx_DIV_TIMER_16BIT   0
#define MNSCx_DIV_TIMER_8BIT    1

    u16         options;    /* options */
#define MNSCx_OPT_CTS       0x0001

    unsigned long       ioclk;      /* base clock rate */
};

#ifdef CONFIG_MN10300_TTYSM0
extern struct mn10300_serial_port mn10300_serial_port_sif0;
#endif

#ifdef CONFIG_MN10300_TTYSM1
extern struct mn10300_serial_port mn10300_serial_port_sif1;
#endif

#ifdef CONFIG_MN10300_TTYSM2
extern struct mn10300_serial_port mn10300_serial_port_sif2;
#endif

extern struct mn10300_serial_port *mn10300_serial_ports[];

struct mn10300_serial_int {
    struct mn10300_serial_port *port;
    asmlinkage void (*vdma)(void);
};

extern struct mn10300_serial_int mn10300_serial_int_tbl[];

extern asmlinkage void mn10300_serial_vdma_interrupt(void);
extern asmlinkage void mn10300_serial_vdma_rx_handler(void);
extern asmlinkage void mn10300_serial_vdma_tx_handler(void);

#endif /* __ASSEMBLY__ */

#if defined(CONFIG_GDBSTUB_ON_TTYSM0)
#define SCgSTR SC0STR
#define SCgRXB SC0RXB
#define SCgRXIRQ SC0RXIRQ
#elif defined(CONFIG_GDBSTUB_ON_TTYSM1)
#define SCgSTR SC1STR
#define SCgRXB SC1RXB
#define SCgRXIRQ SC1RXIRQ
#elif defined(CONFIG_GDBSTUB_ON_TTYSM2)
#define SCgSTR SC2STR
#define SCgRXB SC2RXB
#define SCgRXIRQ SC2RXIRQ
#endif

#endif /* _MN10300_SERIAL_H */