/* airport.c
 *
 * A driver for "Hermes" chipset based Apple Airport wireless
 * card.
 *
 * Copyright notice & release notes in file main.c
 *
 * Note specific to airport stub:
 *
 *  0.05 : first version of the new split driver
 *  0.06 : fix possible hang on powerup, add sleep support
 */

#define DRIVER_NAME "airport"
#define PFX DRIVER_NAME ": "

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/pmac_feature.h>

#include "orinoco.h"

#define AIRPORT_IO_LEN  (0x1000)        /* one page */

struct airport {
        struct macio_dev *mdev;
        void __iomem *vaddr;
        unsigned int irq;
        int irq_requested;
        int ndev_registered;
};

static int
airport_suspend(struct macio_dev *mdev, pm_message_t state)
{
        struct orinoco_private *priv = dev_get_drvdata(&mdev->ofdev.dev);
        struct net_device *dev = priv->ndev;
        struct airport *card = priv->card;
        unsigned long flags;
        int err;

        printk(KERN_DEBUG "%s: Airport entering sleep mode\n", dev->name);

        err = orinoco_lock(priv, &flags);
        if (err) {
                printk(KERN_ERR "%s: hw_unavailable on PBOOK_SLEEP_NOW\n",
                       dev->name);
                return 0;
        }

        orinoco_down(priv);
        orinoco_unlock(priv, &flags);

        disable_irq(card->irq);
        pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE,
                          macio_get_of_node(mdev), 0, 0);

        return 0;
}

static int
airport_resume(struct macio_dev *mdev)
{
        struct orinoco_private *priv = dev_get_drvdata(&mdev->ofdev.dev);
        struct net_device *dev = priv->ndev;
        struct airport *card = priv->card;
        unsigned long flags;
        int err;

        printk(KERN_DEBUG "%s: Airport waking up\n", dev->name);

        pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE,
                          macio_get_of_node(mdev), 0, 1);
        msleep(200);

        enable_irq(card->irq);

        priv->hw.ops->lock_irqsave(&priv->lock, &flags);
        err = orinoco_up(priv);
        priv->hw.ops->unlock_irqrestore(&priv->lock, &flags);

        return err;
}

static int
airport_detach(struct macio_dev *mdev)
{
        struct orinoco_private *priv = dev_get_drvdata(&mdev->ofdev.dev);
        struct airport *card = priv->card;

        if (card->ndev_registered)
                orinoco_if_del(priv);
        card->ndev_registered = 0;

        if (card->irq_requested)
                free_irq(card->irq, priv);
        card->irq_requested = 0;

        if (card->vaddr)
                iounmap(card->vaddr);
        card->vaddr = NULL;

        macio_release_resource(mdev, 0);

        pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE,
                          macio_get_of_node(mdev), 0, 0);
        ssleep(1);

        macio_set_drvdata(mdev, NULL);
        free_orinocodev(priv);

        return 0;
}

static int airport_hard_reset(struct orinoco_private *priv)
{
        /* It would be nice to power cycle the Airport for a real hard
         * reset, but for some reason although it appears to
         * re-initialize properly, it falls in a screaming heap
         * shortly afterwards. */
#if 0
        struct airport *card = priv->card;

        /* Vitally important.  If we don't do this it seems we get an
         * interrupt somewhere during the power cycle, since
         * hw_unavailable is already set it doesn't get ACKed, we get
         * into an interrupt loop and the PMU decides to turn us
         * off. */
        disable_irq(card->irq);

        pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE,
                          macio_get_of_node(card->mdev), 0, 0);
        ssleep(1);
        pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE,
                          macio_get_of_node(card->mdev), 0, 1);
        ssleep(1);

        enable_irq(card->irq);
        ssleep(1);
#endif

        return 0;
}

static int
airport_attach(struct macio_dev *mdev, const struct of_device_id *match)
{
        struct orinoco_private *priv;
        struct airport *card;
        unsigned long phys_addr;
        struct hermes *hw;

        if (macio_resource_count(mdev) < 1 || macio_irq_count(mdev) < 1) {
                printk(KERN_ERR PFX "Wrong interrupt/addresses in OF tree\n");
                return -ENODEV;
        }

        /* Allocate space for private device-specific data */
        priv = alloc_orinocodev(sizeof(*card), &mdev->ofdev.dev,
                                airport_hard_reset, NULL);
        if (!priv) {
                printk(KERN_ERR PFX "Cannot allocate network device\n");
                return -ENODEV;
        }
        card = priv->card;

        hw = &priv->hw;
        card->mdev = mdev;

        if (macio_request_resource(mdev, 0, DRIVER_NAME)) {
                printk(KERN_ERR PFX "can't request IO resource !\n");
                free_orinocodev(priv);
                return -EBUSY;
        }

        macio_set_drvdata(mdev, priv);

        /* Setup interrupts & base address */
        card->irq = macio_irq(mdev, 0);
        phys_addr = macio_resource_start(mdev, 0);  /* Physical address */
        printk(KERN_DEBUG PFX "Physical address %lx\n", phys_addr);
        card->vaddr = ioremap(phys_addr, AIRPORT_IO_LEN);
        if (!card->vaddr) {
                printk(KERN_ERR PFX "ioremap() failed\n");
                goto failed;
        }

        hermes_struct_init(hw, card->vaddr, HERMES_16BIT_REGSPACING);

        /* Power up card */
        pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE,
                          macio_get_of_node(mdev), 0, 1);
        ssleep(1);

        /* Reset it before we get the interrupt */
        hw->ops->init(hw);

        if (request_irq(card->irq, orinoco_interrupt, 0, DRIVER_NAME, priv)) {
                printk(KERN_ERR PFX "Couldn't get IRQ %d\n", card->irq);
                goto failed;
        }
        card->irq_requested = 1;

        /* Initialise the main driver */
        if (orinoco_init(priv) != 0) {
                printk(KERN_ERR PFX "orinoco_init() failed\n");
                goto failed;
        }

        /* Register an interface with the stack */
        if (orinoco_if_add(priv, phys_addr, card->irq, NULL) != 0) {
                printk(KERN_ERR PFX "orinoco_if_add() failed\n");
                goto failed;
        }
        card->ndev_registered = 1;
        return 0;
 failed:
        airport_detach(mdev);
        return -ENODEV;
}                               /* airport_attach */


static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
        " (Benjamin Herrenschmidt <benh@kernel.crashing.org>)";
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("Driver for the Apple Airport wireless card.");
MODULE_LICENSE("Dual MPL/GPL");

static const struct of_device_id airport_match[] = {
        {
        .name           = "radio",
        },
        {},
};

MODULE_DEVICE_TABLE(of, airport_match);

static struct macio_driver airport_driver = {
        .driver = {
                .name           = DRIVER_NAME,
                .owner          = THIS_MODULE,
                .of_match_table = airport_match,
        },
        .probe          = airport_attach,
        .remove         = airport_detach,
        .suspend        = airport_suspend,
        .resume         = airport_resume,
};

static int __init
init_airport(void)
{
        printk(KERN_DEBUG "%s\n", version);

        return macio_register_driver(&airport_driver);
}

static void __exit
exit_airport(void)
{
        macio_unregister_driver(&airport_driver);
}

module_init(init_airport);
module_exit(exit_airport);