/*
 * (C) Copyright 2002
 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <common.h>
#include <linux/compiler.h>
#include <asm/arch/s3c24x0_cpu.h>

DECLARE_GLOBAL_DATA_PTR;

#ifdef CONFIG_SERIAL1
#define UART_NR S3C24X0_UART0

#elif defined(CONFIG_SERIAL2)
#define UART_NR S3C24X0_UART1

#elif defined(CONFIG_SERIAL3)
#define UART_NR S3C24X0_UART2

#else
#error "Bad: you didn't configure serial ..."
#endif

#include <asm/io.h>

#if defined(CONFIG_SERIAL_MULTI)
#include <serial.h>

/* Multi serial device functions */
#define DECLARE_S3C_SERIAL_FUNCTIONS(port) \
        int s3serial##port##_init(void) \
        { \
                return serial_init_dev(port); \
        } \
        void s3serial##port##_setbrg(void) \
        { \
                serial_setbrg_dev(port); \
        } \
        int s3serial##port##_getc(void) \
        { \
                return serial_getc_dev(port); \
        } \
        int s3serial##port##_tstc(void) \
        { \
                return serial_tstc_dev(port); \
        } \
        void s3serial##port##_putc(const char c) \
        { \
                serial_putc_dev(port, c); \
        } \
        void s3serial##port##_puts(const char *s) \
        { \
                serial_puts_dev(port, s); \
        }

#define INIT_S3C_SERIAL_STRUCTURE(port, name) { \
        name, \
        s3serial##port##_init, \
        NULL,\
        s3serial##port##_setbrg, \
        s3serial##port##_getc, \
        s3serial##port##_tstc, \
        s3serial##port##_putc, \
        s3serial##port##_puts, \
}

#endif /* CONFIG_SERIAL_MULTI */

#ifdef CONFIG_HWFLOW
static int hwflow;
#endif

void _serial_setbrg(const int dev_index)
{
        struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
        unsigned int reg = 0;
        int i;

        /* value is calculated so : (int)(PCLK/16./baudrate) -1 */
        reg = get_PCLK() / (16 * gd->baudrate) - 1;

        writel(reg, &uart->ubrdiv);
        for (i = 0; i < 100; i++)
                /* Delay */ ;
}

#if defined(CONFIG_SERIAL_MULTI)
static inline void serial_setbrg_dev(unsigned int dev_index)
{
        _serial_setbrg(dev_index);
}
#else
void serial_setbrg(void)
{
        _serial_setbrg(UART_NR);
}
#endif


/* Initialise the serial port. The settings are always 8 data bits, no parity,
 * 1 stop bit, no start bits.
 */
static int serial_init_dev(const int dev_index)
{
        struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);

#ifdef CONFIG_HWFLOW
        hwflow = 0;     /* turned off by default */
#endif

        /* FIFO enable, Tx/Rx FIFO clear */
        writel(0x07, &uart->ufcon);
        writel(0x0, &uart->umcon);

        /* Normal,No parity,1 stop,8 bit */
        writel(0x3, &uart->ulcon);
        /*
         * tx=level,rx=edge,disable timeout int.,enable rx error int.,
         * normal,interrupt or polling
         */
        writel(0x245, &uart->ucon);

#ifdef CONFIG_HWFLOW
        writel(0x1, &uart->umcon);      /* rts up */
#endif

        /* FIXME: This is sooooooooooooooooooo ugly */
#if defined(CONFIG_ARCH_GTA02_v1) || defined(CONFIG_ARCH_GTA02_v2)
        /* we need auto hw flow control on the gsm and gps port */
        if (dev_index == 0 || dev_index == 1)
                writel(0x10, &uart->umcon);
#endif
        _serial_setbrg(dev_index);

        return (0);
}

#if !defined(CONFIG_SERIAL_MULTI)
/* Initialise the serial port. The settings are always 8 data bits, no parity,
 * 1 stop bit, no start bits.
 */
int serial_init(void)
{
        return serial_init_dev(UART_NR);
}
#endif

/*
 * Read a single byte from the serial port. Returns 1 on success, 0
 * otherwise. When the function is succesfull, the character read is
 * written into its argument c.
 */
int _serial_getc(const int dev_index)
{
        struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);

        while (!(readl(&uart->utrstat) & 0x1))
                /* wait for character to arrive */ ;

        return readb(&uart->urxh) & 0xff;
}

#if defined(CONFIG_SERIAL_MULTI)
static inline int serial_getc_dev(unsigned int dev_index)
{
        return _serial_getc(dev_index);
}
#else
int serial_getc(void)
{
        return _serial_getc(UART_NR);
}
#endif

#ifdef CONFIG_HWFLOW
int hwflow_onoff(int on)
{
        switch (on) {
        case 0:
        default:
                break;          /* return current */
        case 1:
                hwflow = 1;     /* turn on */
                break;
        case -1:
                hwflow = 0;     /* turn off */
                break;
        }
        return hwflow;
}
#endif

#ifdef CONFIG_MODEM_SUPPORT
static int be_quiet = 0;
void disable_putc(void)
{
        be_quiet = 1;
}

void enable_putc(void)
{
        be_quiet = 0;
}
#endif


/*
 * Output a single byte to the serial port.
 */
void _serial_putc(const char c, const int dev_index)
{
        struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);
#ifdef CONFIG_MODEM_SUPPORT
        if (be_quiet)
                return;
#endif

        while (!(readl(&uart->utrstat) & 0x2))
                /* wait for room in the tx FIFO */ ;

#ifdef CONFIG_HWFLOW
        while (hwflow && !(readl(&uart->umstat) & 0x1))
                /* Wait for CTS up */ ;
#endif

        writeb(c, &uart->utxh);

        /* If \n, also do \r */
        if (c == '\n')
                serial_putc('\r');
}

#if defined(CONFIG_SERIAL_MULTI)
static inline void serial_putc_dev(unsigned int dev_index, const char c)
{
        _serial_putc(c, dev_index);
}
#else
void serial_putc(const char c)
{
        _serial_putc(c, UART_NR);
}
#endif


/*
 * Test whether a character is in the RX buffer
 */
int _serial_tstc(const int dev_index)
{
        struct s3c24x0_uart *uart = s3c24x0_get_base_uart(dev_index);

        return readl(&uart->utrstat) & 0x1;
}

#if defined(CONFIG_SERIAL_MULTI)
static inline int serial_tstc_dev(unsigned int dev_index)
{
        return _serial_tstc(dev_index);
}
#else
int serial_tstc(void)
{
        return _serial_tstc(UART_NR);
}
#endif

void _serial_puts(const char *s, const int dev_index)
{
        while (*s) {
                _serial_putc(*s++, dev_index);
        }
}

#if defined(CONFIG_SERIAL_MULTI)
static inline void serial_puts_dev(int dev_index, const char *s)
{
        _serial_puts(s, dev_index);
}
#else
void serial_puts(const char *s)
{
        _serial_puts(s, UART_NR);
}
#endif

#if defined(CONFIG_SERIAL_MULTI)
DECLARE_S3C_SERIAL_FUNCTIONS(0);
struct serial_device s3c24xx_serial0_device =
INIT_S3C_SERIAL_STRUCTURE(0, "s3ser0");
DECLARE_S3C_SERIAL_FUNCTIONS(1);
struct serial_device s3c24xx_serial1_device =
INIT_S3C_SERIAL_STRUCTURE(1, "s3ser1");
DECLARE_S3C_SERIAL_FUNCTIONS(2);
struct serial_device s3c24xx_serial2_device =
INIT_S3C_SERIAL_STRUCTURE(2, "s3ser2");

__weak struct serial_device *default_serial_console(void)
{
#if defined(CONFIG_SERIAL1)
        return &s3c24xx_serial0_device;
#elif defined(CONFIG_SERIAL2)
        return &s3c24xx_serial1_device;
#elif defined(CONFIG_SERIAL3)
        return &s3c24xx_serial2_device;
#else
#error "CONFIG_SERIAL? missing."
#endif
}
#endif /* CONFIG_SERIAL_MULTI */