airport.c

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/* 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 <[email protected]>)";
MODULE_AUTHOR("Benjamin Herrenschmidt <[email protected]>");
MODULE_DESCRIPTION("Driver for the Apple Airport wireless card.");
MODULE_LICENSE("Dual MPL/GPL");

static 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);