/*
 *  Created 20 Oct 2004 by Mark Lord
 *
 *  Basic support for Delkin/ASKA/Workbit Cardbus CompactFlash adapter
 *
 *  Modeled after the 16-bit PCMCIA driver: ide-cs.c
 *
 *  This is slightly peculiar, in that it is a PCI driver,
 *  but is NOT an IDE PCI driver -- the IDE layer does not directly
 *  support hot insertion/removal of PCI interfaces, so this driver
 *  is unable to use the IDE PCI interfaces.  Instead, it uses the
 *  same interfaces as the ide-cs (PCMCIA) driver uses.
 *  On the plus side, the driver is also smaller/simpler this way.
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <linux/pci.h>

#include <asm/io.h>

/*
 * No chip documentation has yet been found,
 * so these configuration values were pulled from
 * a running Win98 system using "debug".
 * This gives around 3MByte/second read performance,
 * which is about 2/3 of what the chip is capable of.
 *
 * There is also a 4KByte mmio region on the card,
 * but its purpose has yet to be reverse-engineered.
 */
static const u8 setup[] = {
        0x00, 0x05, 0xbe, 0x01, 0x20, 0x8f, 0x00, 0x00,
        0xa4, 0x1f, 0xb3, 0x1b, 0x00, 0x00, 0x00, 0x80,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0xa4, 0x83, 0x02, 0x13,
};

static const struct ide_port_ops delkin_cb_port_ops = {
        .quirkproc              = ide_undecoded_slave,
};

static int delkin_cb_init_chipset(struct pci_dev *dev)
{
        unsigned long base = pci_resource_start(dev, 0);
        int i;

        outb(0x02, base + 0x1e);        /* set nIEN to block interrupts */
        inb(base + 0x17);               /* read status to clear interrupts */

        for (i = 0; i < sizeof(setup); ++i) {
                if (setup[i])
                        outb(setup[i], base + i);
        }

        return 0;
}

static const struct ide_port_info delkin_cb_port_info = {
        .port_ops               = &delkin_cb_port_ops,
        .host_flags             = IDE_HFLAG_IO_32BIT | IDE_HFLAG_UNMASK_IRQS |
                                  IDE_HFLAG_NO_DMA,
        .irq_flags              = IRQF_SHARED,
        .init_chipset           = delkin_cb_init_chipset,
        .chipset                = ide_pci,
};

static int __devinit
delkin_cb_probe (struct pci_dev *dev, const struct pci_device_id *id)
{
        struct ide_host *host;
        unsigned long base;
        int rc;
        struct ide_hw hw, *hws[] = { &hw };

        rc = pci_enable_device(dev);
        if (rc) {
                printk(KERN_ERR "delkin_cb: pci_enable_device failed (%d)\n", rc);
                return rc;
        }
        rc = pci_request_regions(dev, "delkin_cb");
        if (rc) {
                printk(KERN_ERR "delkin_cb: pci_request_regions failed (%d)\n", rc);
                pci_disable_device(dev);
                return rc;
        }
        base = pci_resource_start(dev, 0);

        delkin_cb_init_chipset(dev);

        memset(&hw, 0, sizeof(hw));
        ide_std_init_ports(&hw, base + 0x10, base + 0x1e);
        hw.irq = dev->irq;
        hw.dev = &dev->dev;

        rc = ide_host_add(&delkin_cb_port_info, hws, 1, &host);
        if (rc)
                goto out_disable;

        pci_set_drvdata(dev, host);

        return 0;

out_disable:
        pci_release_regions(dev);
        pci_disable_device(dev);
        return rc;
}

static void
delkin_cb_remove (struct pci_dev *dev)
{
        struct ide_host *host = pci_get_drvdata(dev);

        ide_host_remove(host);

        pci_release_regions(dev);
        pci_disable_device(dev);
}

#ifdef CONFIG_PM
static int delkin_cb_suspend(struct pci_dev *dev, pm_message_t state)
{
        pci_save_state(dev);
        pci_disable_device(dev);
        pci_set_power_state(dev, pci_choose_state(dev, state));

        return 0;
}

static int delkin_cb_resume(struct pci_dev *dev)
{
        struct ide_host *host = pci_get_drvdata(dev);
        int rc;

        pci_set_power_state(dev, PCI_D0);

        rc = pci_enable_device(dev);
        if (rc)
                return rc;

        pci_restore_state(dev);
        pci_set_master(dev);

        if (host->init_chipset)
                host->init_chipset(dev);

        return 0;
}
#else
#define delkin_cb_suspend NULL
#define delkin_cb_resume NULL
#endif

static struct pci_device_id delkin_cb_pci_tbl[] __devinitdata = {
        { 0x1145, 0xf021, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        { 0x1145, 0xf024, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        { 0, },
};
MODULE_DEVICE_TABLE(pci, delkin_cb_pci_tbl);

static struct pci_driver delkin_cb_pci_driver = {
        .name           = "Delkin-ASKA-Workbit Cardbus IDE",
        .id_table       = delkin_cb_pci_tbl,
        .probe          = delkin_cb_probe,
        .remove         = delkin_cb_remove,
        .suspend        = delkin_cb_suspend,
        .resume         = delkin_cb_resume,
};

static int __init delkin_cb_init(void)
{
        return pci_register_driver(&delkin_cb_pci_driver);
}

static void __exit delkin_cb_exit(void)
{
        pci_unregister_driver(&delkin_cb_pci_driver);
}

module_init(delkin_cb_init);
module_exit(delkin_cb_exit);

MODULE_AUTHOR("Mark Lord");
MODULE_DESCRIPTION("Basic support for Delkin/ASKA/Workbit Cardbus IDE");
MODULE_LICENSE("GPL");