/*
 * (C) Copyright 2000 - 2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 *
 * Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
 * changes based on the file arch/powerpc/mbxboot/m8260_tty.c from the
 * Linux/PPC sources (m8260_tty.c had no copyright info in it).
 *
 * Martin Krause, 8 Jun 2006
 * Added SERIAL_MULTI support
 */

/*
 * Minimal serial functions needed to use one of the PSC ports
 * as serial console interface.
 */

#include <common.h>
#include <linux/compiler.h>
#include <mpc5xxx.h>
#include <serial.h>

DECLARE_GLOBAL_DATA_PTR;

#if defined(CONFIG_PSC_CONSOLE)

#if CONFIG_PSC_CONSOLE == 1
#define PSC_BASE MPC5XXX_PSC1
#elif CONFIG_PSC_CONSOLE == 2
#define PSC_BASE MPC5XXX_PSC2
#elif CONFIG_PSC_CONSOLE == 3
#define PSC_BASE MPC5XXX_PSC3
#elif CONFIG_PSC_CONSOLE == 4
#define PSC_BASE MPC5XXX_PSC4
#elif CONFIG_PSC_CONSOLE == 5
#define PSC_BASE MPC5XXX_PSC5
#elif CONFIG_PSC_CONSOLE == 6
#define PSC_BASE MPC5XXX_PSC6
#else
#error CONFIG_PSC_CONSOLE must be in 1 ... 6
#endif

#if defined(CONFIG_PSC_CONSOLE2)

#if CONFIG_PSC_CONSOLE2 == 1
#define PSC_BASE2 MPC5XXX_PSC1
#elif CONFIG_PSC_CONSOLE2 == 2
#define PSC_BASE2 MPC5XXX_PSC2
#elif CONFIG_PSC_CONSOLE2 == 3
#define PSC_BASE2 MPC5XXX_PSC3
#elif CONFIG_PSC_CONSOLE2 == 4
#define PSC_BASE2 MPC5XXX_PSC4
#elif CONFIG_PSC_CONSOLE2 == 5
#define PSC_BASE2 MPC5XXX_PSC5
#elif CONFIG_PSC_CONSOLE2 == 6
#define PSC_BASE2 MPC5XXX_PSC6
#else
#error CONFIG_PSC_CONSOLE2 must be in 1 ... 6
#endif

#endif

int serial_init_dev (unsigned long dev_base)
{
        volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
        unsigned long baseclk;
        int div;

        /* reset PSC */
        psc->command = PSC_SEL_MODE_REG_1;

        /* select clock sources */
        psc->psc_clock_select = 0;
        baseclk = (gd->arch.ipb_clk + 16) / 32;

        /* switch to UART mode */
        psc->sicr = 0;

        /* configure parity, bit length and so on */
        psc->mode = PSC_MODE_8_BITS | PSC_MODE_PARNONE;
        psc->mode = PSC_MODE_ONE_STOP;

        /* set up UART divisor */
        div = (baseclk + (gd->baudrate/2)) / gd->baudrate;
        psc->ctur = (div >> 8) & 0xff;
        psc->ctlr = div & 0xff;

        /* disable all interrupts */
        psc->psc_imr = 0;

        /* reset and enable Rx/Tx */
        psc->command = PSC_RST_RX;
        psc->command = PSC_RST_TX;
        psc->command = PSC_RX_ENABLE | PSC_TX_ENABLE;

        return (0);
}

void serial_putc_dev (unsigned long dev_base, const char c)
{
        volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

        if (c == '\n')
                serial_putc_dev (dev_base, '\r');

        /* Wait for last character to go. */
        while (!(psc->psc_status & PSC_SR_TXEMP))
                ;

        psc->psc_buffer_8 = c;
}

void serial_putc_raw_dev(unsigned long dev_base, const char c)
{
        volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
        /* Wait for last character to go. */
        while (!(psc->psc_status & PSC_SR_TXEMP))
                ;

        psc->psc_buffer_8 = c;
}


void serial_puts_dev (unsigned long dev_base, const char *s)
{
        while (*s) {
                serial_putc_dev (dev_base, *s++);
        }
}

int serial_getc_dev (unsigned long dev_base)
{
        volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

        /* Wait for a character to arrive. */
        while (!(psc->psc_status & PSC_SR_RXRDY))
                ;

        return psc->psc_buffer_8;
}

int serial_tstc_dev (unsigned long dev_base)
{
        volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

        return (psc->psc_status & PSC_SR_RXRDY);
}

void serial_setbrg_dev (unsigned long dev_base)
{
        volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;
        unsigned long baseclk, div;

        baseclk = (gd->arch.ipb_clk + 16) / 32;

        /* set up UART divisor */
        div = (baseclk + (gd->baudrate/2)) / gd->baudrate;
        psc->ctur = (div >> 8) & 0xFF;
        psc->ctlr =  div & 0xff;
}

void serial_setrts_dev (unsigned long dev_base, int s)
{
        volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

        if (s) {
                /* Assert RTS (become LOW) */
                psc->op1 = 0x1;
        }
        else {
                /* Negate RTS (become HIGH) */
                psc->op0 = 0x1;
        }
}

int serial_getcts_dev (unsigned long dev_base)
{
        volatile struct mpc5xxx_psc *psc = (struct mpc5xxx_psc *)dev_base;

        return (psc->ip & 0x1) ? 0 : 1;
}

int serial0_init(void)
{
        return (serial_init_dev(PSC_BASE));
}

void serial0_setbrg (void)
{
        serial_setbrg_dev(PSC_BASE);
}

void serial0_putc(const char c)
{
        serial_putc_dev(PSC_BASE,c);
}

void serial0_puts(const char *s)
{
        serial_puts_dev(PSC_BASE, s);
}

int serial0_getc(void)
{
        return(serial_getc_dev(PSC_BASE));
}

int serial0_tstc(void)
{
        return (serial_tstc_dev(PSC_BASE));
}

struct serial_device serial0_device =
{
        .name   = "serial0",
        .start  = serial0_init,
        .stop   = NULL,
        .setbrg = serial0_setbrg,
        .getc   = serial0_getc,
        .tstc   = serial0_tstc,
        .putc   = serial0_putc,
        .puts   = serial0_puts,
};

__weak struct serial_device *default_serial_console(void)
{
        return &serial0_device;
}

#ifdef CONFIG_PSC_CONSOLE2
int serial1_init(void)
{
        return serial_init_dev(PSC_BASE2);
}

void serial1_setbrg(void)
{
        serial_setbrg_dev(PSC_BASE2);
}

void serial1_putc(const char c)
{
        serial_putc_dev(PSC_BASE2, c);
}

void serial1_puts(const char *s)
{
        serial_puts_dev(PSC_BASE2, s);
}

int serial1_getc(void)
{
        return serial_getc_dev(PSC_BASE2);
}

int serial1_tstc(void)
{
        return serial_tstc_dev(PSC_BASE2);
}

struct serial_device serial1_device =
{
        .name   = "serial1",
        .start  = serial1_init,
        .stop   = NULL,
        .setbrg = serial1_setbrg,
        .getc   = serial1_getc,
        .tstc   = serial1_tstc,
        .putc   = serial1_putc,
        .puts   = serial1_puts,
};
#endif /* CONFIG_PSC_CONSOLE2 */

#endif /* CONFIG_PSC_CONSOLE */