linux-imx

/*

 * Sonics Silicon Backplane

 * Broadcom EXTIF core driver

 *

 * Copyright 2005, Broadcom Corporation

 * Copyright 2006, 2007, Michael Buesch <m@bues.ch>

 * Copyright 2006, 2007, Felix Fietkau <nbd@openwrt.org>

 * Copyright 2007, Aurelien Jarno <aurelien@aurel32.net>

 *

 * Licensed under the GNU/GPL. See COPYING for details.

 */

​

#include "ssb_private.h"

​

#include <linux/serial.h>

#include <linux/serial_core.h>

#include <linux/serial_reg.h>

​

​

static inline u32 extif_read32(struct ssb_extif *extif, u16 offset)

{

    return ssb_read32(extif->dev, offset);

}

​

static inline void extif_write32(struct ssb_extif *extif, u16 offset, u32 value)

{

    ssb_write32(extif->dev, offset, value);

}

​

static inline u32 extif_write32_masked(struct ssb_extif *extif, u16 offset,

                       u32 mask, u32 value)

{

    value &= mask;

    value |= extif_read32(extif, offset) & ~mask;

    extif_write32(extif, offset, value);

​

    return value;

}

​

#ifdef CONFIG_SSB_SERIAL

static bool serial_exists(u8 *regs)

{

    u8 save_mcr, msr = 0;

​

    if (regs) {

        save_mcr = regs[UART_MCR];

        regs[UART_MCR] = (UART_MCR_LOOP | UART_MCR_OUT2 | UART_MCR_RTS);

        msr = regs[UART_MSR] & (UART_MSR_DCD | UART_MSR_RI

                    | UART_MSR_CTS | UART_MSR_DSR);

        regs[UART_MCR] = save_mcr;

    }

    return (msr == (UART_MSR_DCD | UART_MSR_CTS));

}

​

int ssb_extif_serial_init(struct ssb_extif *extif, struct ssb_serial_port *ports)

{

    u32 i, nr_ports = 0;

​

    /* Disable GPIO interrupt initially */

    extif_write32(extif, SSB_EXTIF_GPIO_INTPOL, 0);

    extif_write32(extif, SSB_EXTIF_GPIO_INTMASK, 0);

​

    for (i = 0; i < 2; i++) {