8250_acorn.c

Go to the documentation of this file.

/*
 *  linux/drivers/serial/acorn.c
 *
 *  Copyright (C) 1996-2003 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/tty.h>
#include <linux/serial_core.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/init.h>

#include <asm/io.h>
#include <asm/ecard.h>
#include <asm/string.h>

#include "8250.h"

#define MAX_PORTS   3

struct serial_card_type {
    unsigned int    num_ports;
    unsigned int    uartclk;
    unsigned int    type;
    unsigned int    offset[MAX_PORTS];
};

struct serial_card_info {
    unsigned int    num_ports;
    int     ports[MAX_PORTS];
    void __iomem *vaddr;
};

static int __devinit
serial_card_probe(struct expansion_card *ec, const struct ecard_id *id)
{
    struct serial_card_info *info;
    struct serial_card_type *type = id->data;
    struct uart_8250_port uart;
    unsigned long bus_addr;
    unsigned int i;

    info = kzalloc(sizeof(struct serial_card_info), GFP_KERNEL);
    if (!info)
        return -ENOMEM;

    info->num_ports = type->num_ports;

    bus_addr = ecard_resource_start(ec, type->type);
    info->vaddr = ecardm_iomap(ec, type->type, 0, 0);
    if (!info->vaddr) {
        kfree(info);
        return -ENOMEM;
    }

    ecard_set_drvdata(ec, info);

    memset(&uart, 0, sizeof(struct uart_8250_port));
    uart.port.irq   = ec->irq;
    uart.port.flags = UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;
    uart.port.uartclk   = type->uartclk;
    uart.port.iotype    = UPIO_MEM;
    uart.port.regshift  = 2;
    uart.port.dev   = &ec->dev;

    for (i = 0; i < info->num_ports; i ++) {
        uart.port.membase = info->vaddr + type->offset[i];
        uart.port.mapbase = bus_addr + type->offset[i];

        info->ports[i] = serial8250_register_8250_port(&uart);
    }

    return 0;
}

static void __devexit serial_card_remove(struct expansion_card *ec)
{
    struct serial_card_info *info = ecard_get_drvdata(ec);
    int i;

    ecard_set_drvdata(ec, NULL);

    for (i = 0; i < info->num_ports; i++)
        if (info->ports[i] > 0)
            serial8250_unregister_port(info->ports[i]);

    kfree(info);
}

static struct serial_card_type atomwide_type = {
    .num_ports  = 3,
    .uartclk    = 7372800,
    .type       = ECARD_RES_IOCSLOW,
    .offset     = { 0x2800, 0x2400, 0x2000 },
};

static struct serial_card_type serport_type = {
    .num_ports  = 2,
    .uartclk    = 3686400,
    .type       = ECARD_RES_IOCSLOW,
    .offset     = { 0x2000, 0x2020 },
};

static const struct ecard_id serial_cids[] = {
    { MANU_ATOMWIDE,    PROD_ATOMWIDE_3PSERIAL, &atomwide_type  },
    { MANU_SERPORT,     PROD_SERPORT_DSPORT,    &serport_type   },
    { 0xffff, 0xffff }
};

static struct ecard_driver serial_card_driver = {
    .probe      = serial_card_probe,
    .remove     = __devexit_p(serial_card_remove),
    .id_table   = serial_cids,
    .drv = {
        .name   = "8250_acorn",
    },
};

static int __init serial_card_init(void)
{
    return ecard_register_driver(&serial_card_driver);
}

static void __exit serial_card_exit(void)
{
    ecard_remove_driver(&serial_card_driver);
}

MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("Acorn 8250-compatible serial port expansion card driver");
MODULE_LICENSE("GPL");

module_init(serial_card_init);
module_exit(serial_card_exit);