// SPDX-License-Identifier: GPL-2.0-only

/*
 *   pata-isapnp.c - ISA PnP PATA controller driver.
 *   Copyright 2005/2006 Red Hat Inc, all rights reserved.
 *
 *   Based in part on ide-pnp.c by Andrey Panin <pazke@donpac.ru>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/isapnp.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/ata.h>
#include <linux/libata.h>

#define DRV_NAME "pata_isapnp"
#define DRV_VERSION "0.2.5"

static const struct scsi_host_template isapnp_sht = {
        ATA_PIO_SHT(DRV_NAME),
};

static struct ata_port_operations isapnp_port_ops = {
        .inherits       = &ata_sff_port_ops,
        .cable_detect   = ata_cable_40wire,
};

static struct ata_port_operations isapnp_noalt_port_ops = {
        .inherits       = &ata_sff_port_ops,
        .cable_detect   = ata_cable_40wire,
        /* No altstatus so we don't want to use the lost interrupt poll */
        .lost_interrupt = ATA_OP_NULL,
};

/**
 *      isapnp_init_one         -       attach an isapnp interface
 *      @idev: PnP device
 *      @dev_id: matching detect line
 *
 *      Register an ISA bus IDE interface. Such interfaces are PIO 0 and
 *      non shared IRQ.
 */

static int isapnp_init_one(struct pnp_dev *idev, const struct pnp_device_id *dev_id)
{
        struct ata_host *host;
        struct ata_port *ap;
        void __iomem *cmd_addr, *ctl_addr;
        int irq = 0;
        irq_handler_t handler = NULL;

        if (pnp_port_valid(idev, 0) == 0)
                return -ENODEV;

        if (pnp_irq_valid(idev, 0)) {
                irq = pnp_irq(idev, 0);
                handler = ata_sff_interrupt;
        }

        /* allocate host */
        host = ata_host_alloc(&idev->dev, 1);
        if (!host)
                return -ENOMEM;

        /* acquire resources and fill host */
        cmd_addr = devm_ioport_map(&idev->dev, pnp_port_start(idev, 0), 8);
        if (!cmd_addr)
                return -ENOMEM;

        ap = host->ports[0];

        ap->ops = &isapnp_noalt_port_ops;
        ap->pio_mask = ATA_PIO0;
        ap->flags |= ATA_FLAG_SLAVE_POSS;

        ap->ioaddr.cmd_addr = cmd_addr;

        if (pnp_port_valid(idev, 1)) {
                ctl_addr = devm_ioport_map(&idev->dev,
                                           pnp_port_start(idev, 1), 1);
                if (!ctl_addr)
                        return -ENOMEM;

                ap->ioaddr.altstatus_addr = ctl_addr;
                ap->ioaddr.ctl_addr = ctl_addr;
                ap->ops = &isapnp_port_ops;
        }

        ata_sff_std_ports(&ap->ioaddr);

        ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
                      (unsigned long long)pnp_port_start(idev, 0),
                      (unsigned long long)pnp_port_start(idev, 1));

        /* activate */
        return ata_host_activate(host, irq, handler, 0,
                                 &isapnp_sht);
}

/**
 *      isapnp_remove_one       -       unplug an isapnp interface
 *      @idev: PnP device
 *
 *      Remove a previously configured PnP ATA port. Called only on module
 *      unload events as the core does not currently deal with ISAPnP docking.
 */

static void isapnp_remove_one(struct pnp_dev *idev)
{
        struct device *dev = &idev->dev;
        struct ata_host *host = dev_get_drvdata(dev);

        ata_host_detach(host);
}

static struct pnp_device_id isapnp_devices[] = {
        /* Generic ESDI/IDE/ATA compatible hard disk controller */
        {.id = "PNP0600", .driver_data = 0},
        {.id = ""}
};

MODULE_DEVICE_TABLE(pnp, isapnp_devices);

static struct pnp_driver isapnp_driver = {
        .name           = DRV_NAME,
        .id_table       = isapnp_devices,
        .probe          = isapnp_init_one,
        .remove         = isapnp_remove_one,
};

module_pnp_driver(isapnp_driver);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ISA PnP ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);