Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 16550 serial console support.

 *

 * Original copied from <file:arch/ppc/boot/common/ns16550.c>

 * (which had no copyright)

 * Modifications: 2006 (c) MontaVista Software, Inc.

 *

 * Modified by: Mark A. Greer <mgreer@mvista.com>

 */

#include <stdarg.h>

#include <stddef.h>

#include "types.h"

#include "string.h"

#include "stdio.h"

#include "io.h"

#include "ops.h"

#define UART_DLL        0        /* Out: Divisor Latch Low */

#define UART_DLM        1       /* Out: Divisor Latch High */

#define UART_FCR        2       /* Out: FIFO Control Register */

#define UART_LCR        3       /* Out: Line Control Register */

#define UART_MCR        4       /* Out: Modem Control Register */

#define UART_LSR        5       /* In:  Line Status Register */

#define UART_LSR_THRE   0x20    /* Transmit-hold-register empty */

#define UART_LSR_DR     0x01    /* Receiver data ready */

#define UART_MSR        6       /* In:  Modem Status Register */

#define UART_SCR        7       /* I/O: Scratch Register */

static unsigned char *reg_base;

static u32 reg_shift;

static int ns16550_open(void)

{

        out_8(reg_base + (UART_FCR << reg_shift), 0x06);

        return 0;

}

static void ns16550_putc(unsigned char c)

{

        while ((in_8(reg_base + (UART_LSR << reg_shift)) & UART_LSR_THRE) == 0);

        out_8(reg_base, c);

}

static unsigned char ns16550_getc(void)

{

        while ((in_8(reg_base + (UART_LSR << reg_shift)) & UART_LSR_DR) == 0);

        return in_8(reg_base);

}

static u8 ns16550_tstc(void)

{

        return ((in_8(reg_base + (UART_LSR << reg_shift)) & UART_LSR_DR) != 0);

}

int ns16550_console_init(void *devp, struct serial_console_data *scdp)

{

        int n;

        unsigned long reg_phys;

        n = getprop(devp, "virtual-reg", &reg_base, sizeof(reg_base));

        if (n != sizeof(reg_base)) {

                if (!dt_xlate_reg(devp, 0, &reg_phys, NULL))

                        return -1;

                reg_base = (void *)reg_phys;

        }

        n = getprop(devp, "reg-shift", &reg_shift, sizeof(reg_shift));

        if (n != sizeof(reg_shift))

                reg_shift = 0;

        scdp->open = ns16550_open;

        scdp->putc = ns16550_putc;

        scdp->getc = ns16550_getc;

        scdp->tstc = ns16550_tstc;

        scdp->close = NULL;

        return 0;

}