// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/drivers/serial/acorn.c
 *
 *  Copyright (C) 1996-2003 Russell King.
 */
#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
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_obj(struct serial_card_info);
        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 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         = 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);