#include <linux/init.h>
#include <linux/console.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/serial_reg.h>

#include <asm/delay.h>
#include <asm/serial.h>
#include <asm/io.h>

static unsigned long port = 0x1c800000;

static __inline__ void ns16550_cons_put_char(char ch, unsigned long ioaddr)
{
       	char lsr;

        do {    lsr = inb(ioaddr + UART_LSR);
	} while ((lsr & (UART_LSR_TEMT | UART_LSR_THRE)) != (UART_LSR_TEMT | UART_LSR_THRE));
        outb(ch, ioaddr + UART_TX);
}

static __inline__ char ns16550_cons_get_char(unsigned long ioaddr)
{
        char lsr;

       	while ((inb(ioaddr + UART_LSR) & UART_LSR_DR) == 0)
               	udelay(1);
       	return inb(ioaddr + UART_RX);
}

void ns16550_console_write(struct console *co, const char *s, unsigned count)
{
        char lsr, ier;
        unsigned i;

        ier = inb(port + UART_IER);
        outb(0x00, port + UART_IER);
        for (i=0; i < count; i++, s++) {
                if(*s == '\n')
                        ns16550_cons_put_char('\r', port);
                ns16550_cons_put_char(*s, port);
        }

        do {    lsr = inb(port + UART_LSR);
	} while ((lsr & (UART_LSR_TEMT | UART_LSR_THRE)) != (UART_LSR_TEMT | UART_LSR_THRE));
        outb(ier, port + UART_IER);
}

char getDebugChar(void)
{
      	return ns16550_cons_get_char(port);
}

void putDebugChar(char kgdb_char)
{
       	ns16550_cons_put_char(kgdb_char, port);
}

static kdev_t ns16550_console_dev(struct console *c)
{
       	return MKDEV(TTY_MAJOR, 64 + c->index);
}

static struct console ns16550_console = {
    	name:      "prom",
    	setup:     NULL,
    	write:     ns16550_console_write,
    	device:    ns16550_console_dev,
    	flags:     CON_PRINTBUFFER,
    	index:     -1,
};

void __init ns16550_setup_console(void)
{
       	register_console(&ns16550_console);
}