8250.h

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/*
 *  Driver for 8250/16550-type serial ports
 *
 *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
 *
 *  Copyright (C) 2001 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/serial_8250.h>

struct old_serial_port {
    unsigned int uart;
    unsigned int baud_base;
    unsigned int port;
    unsigned int irq;
    unsigned int flags;
    unsigned char hub6;
    unsigned char io_type;
    unsigned char *iomem_base;
    unsigned short iomem_reg_shift;
    unsigned long irqflags;
};

struct serial8250_config {
    const char  *name;
    unsigned short  fifo_size;
    unsigned short  tx_loadsz;
    unsigned char   fcr;
    unsigned int    flags;
};

#define UART_CAP_FIFO   (1 << 8)    /* UART has FIFO */
#define UART_CAP_EFR    (1 << 9)    /* UART has EFR */
#define UART_CAP_SLEEP  (1 << 10)   /* UART has IER sleep */
#define UART_CAP_AFE    (1 << 11)   /* MCR-based hw flow control */
#define UART_CAP_UUE    (1 << 12)   /* UART needs IER bit 6 set (Xscale) */
#define UART_CAP_RTOIE  (1 << 13)   /* UART needs IER bit 4 set (Xscale, Tegra) */

#define UART_BUG_QUOT   (1 << 0)    /* UART has buggy quot LSB */
#define UART_BUG_TXEN   (1 << 1)    /* UART has buggy TX IIR status */
#define UART_BUG_NOMSR  (1 << 2)    /* UART has buggy MSR status bits (Au1x00) */
#define UART_BUG_THRE   (1 << 3)    /* UART has buggy THRE reassertion */
#define UART_BUG_PARITY (1 << 4)    /* UART mishandles parity if FIFO enabled */

#define PROBE_RSA   (1 << 0)
#define PROBE_ANY   (~0)

#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)

#ifdef CONFIG_SERIAL_8250_SHARE_IRQ
#define SERIAL8250_SHARE_IRQS 1
#else
#define SERIAL8250_SHARE_IRQS 0
#endif

static inline int serial_in(struct uart_8250_port *up, int offset)
{
    return up->port.serial_in(&up->port, offset);
}

static inline void serial_out(struct uart_8250_port *up, int offset, int value)
{
    up->port.serial_out(&up->port, offset, value);
}

void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p);

static inline int serial_dl_read(struct uart_8250_port *up)
{
    return up->dl_read(up);
}

static inline void serial_dl_write(struct uart_8250_port *up, int value)
{
    up->dl_write(up, value);
}

#if defined(__alpha__) && !defined(CONFIG_PCI)
/*
 * Digital did something really horribly wrong with the OUT1 and OUT2
 * lines on at least some ALPHA's.  The failure mode is that if either
 * is cleared, the machine locks up with endless interrupts.
 */
#define ALPHA_KLUDGE_MCR  (UART_MCR_OUT2 | UART_MCR_OUT1)
#elif defined(CONFIG_SBC8560)
/*
 * WindRiver did something similarly broken on their SBC8560 board. The
 * UART tristates its IRQ output while OUT2 is clear, but they pulled
 * the interrupt line _up_ instead of down, so if we register the IRQ
 * while the UART is in that state, we die in an IRQ storm. */
#define ALPHA_KLUDGE_MCR (UART_MCR_OUT2)
#else
#define ALPHA_KLUDGE_MCR 0
#endif

#ifdef CONFIG_SERIAL_8250_PNP
int serial8250_pnp_init(void);
void serial8250_pnp_exit(void);
#else
static inline int serial8250_pnp_init(void) { return 0; }
static inline void serial8250_pnp_exit(void) { }
#endif