/*      $NetBSD: console.c,v 1.3 2016/10/05 15:54:58 ryo Exp $  */
/*-
 * Copyright (c) 2011 CradlePoint Technology, Inc.
 * All rights reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY CRADLEPOINT TECHNOLOGY, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: console.c,v 1.3 2016/10/05 15:54:58 ryo Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>

#include <dev/cons.h>

#include <mips/ralink/ralink_reg.h>
#include <mips/ralink/ralink_var.h>

#ifndef RALINK_CONADDR
#define RALINK_CONADDR  RA_UART_LITE_BASE       /* default console is UART_LITE */
#endif

static inline uint32_t
sysctl_read(const u_int offset)
{
        return *RA_IOREG_VADDR(RA_SYSCTL_BASE, offset);
}

static inline void
sysctl_write(const u_int offset, uint32_t val)
{
        *RA_IOREG_VADDR(RA_SYSCTL_BASE, offset) = val;
}

static inline uint32_t
uart_read(const u_int offset)
{
        return *RA_IOREG_VADDR(RALINK_CONADDR, offset);
}

static inline void
uart_write(const u_int offset, const uint32_t val)
{
        *RA_IOREG_VADDR(RALINK_CONADDR, offset) = val;
}

#ifdef RA_CONSOLE_EARLY 
static void
ra_console_putc(dev_t dev, int c)
{
        u_int timo;

        timo = 150000;
        do {
                if ((uart_read(RA_UART_LSR) & UART_LSR_TDRQ) != 0)
                        break;
        } while(--timo != 0);

        uart_write(RA_UART_TBR, c);
        if (c == '\n')
                ra_console_putc (dev, '\r');
#if 1
        timo = 150000;
        do {
                if ((uart_read(RA_UART_LSR) & UART_LSR_TEMT) != 0)
                        break;
        } while(--timo != 0); 
#endif
}

static int
ra_console_getc(dev_t dev)
{
        while ((uart_read(RA_UART_LSR) & UART_LSR_DR) == 0)
                ;
        return (char)(uart_read(RA_UART_RBR) & 0xff);
}

static void
ra_console_flush(dev_t dev)
{
        while ((uart_read(RA_UART_LSR) & UART_LSR_TEMT) == 0)
                ;
}

void
ra_console_early(void)
{
        uint32_t r;

        /* reset */
        r = sysctl_read(RA_SYSCTL_RST);
        r |= RST_UARTL;
        sysctl_write(RA_SYSCTL_RST, r);
        r ^= RST_UARTL;
        sysctl_write(RA_SYSCTL_RST, r);

        /* make sure we are in UART mode */
        r = sysctl_read(RA_SYSCTL_GPIOMODE);
        r &= ~GPIOMODE_UARTL;
        sysctl_write(RA_SYSCTL_GPIOMODE, r);

        uart_write(RA_UART_IER, 0);             /* disable interrupts */
        uart_write(RA_UART_FCR, 0);             /* disable fifos */

        /* set baud rate */
        uart_write(RA_UART_LCR,
                UART_LCR_WLS0 | UART_LCR_WLS1 | UART_LCR_DLAB);
        uart_write(RA_UART_DLL,
                (RA_UART_FREQ / RA_SERIAL_CLKDIV / RA_BAUDRATE)
                        & 0xffff);
        uart_write(RA_UART_LCR,
                UART_LCR_WLS0 | UART_LCR_WLS1);

        static struct consdev lite_cn = {
            .cn_probe = NULL,
            .cn_init = NULL,
            .cn_getc = ra_console_getc,
            .cn_putc = ra_console_putc,
            .cn_pollc = nullcnpollc,
            .cn_bell = NULL,
            .cn_halt = NULL,
            .cn_flush = ra_console_flush,
            .cn_dev = makedev(0, 0),
            .cn_pri = CN_DEAD,
        };

        cn_tab = &lite_cn;

}
#endif  /* RA_CONSOLE_EARLY */

void
consinit(void)
{
        if (ra_check_memo_reg(SERIAL_CONSOLE)) {
                ralink_com_early(0);
                printf("Enabled early console\n");
        } else {
                /*
                 * this should be OK, but our shell configuration doesn't seem
                 * to be working, so create a silent console
                 */
                cn_tab = NULL;
                ralink_com_early(1);
                printf("Enabled silent console\n");
        }

#if 0
        /* update ddb escape sequence to '~~' to avoid the undocking issue */
        cn_set_magic("\x7E\x7E");
#endif
}