drivers/net/wireless/airport.c

   1 /* airport.c
   2  *
   3  * A driver for "Hermes" chipset based Apple Airport wireless
   4  * card.
   5  *
   6  * Copyright notice & release notes in file orinoco.c
   7  *
   8  * Note specific to airport stub:
   9  *
  10  *  0.05 : first version of the new split driver
  11  *  0.06 : fix possible hang on powerup, add sleep support
  12  */
  13
  14 #define DRIVER_NAME "airport"
  15 #define PFX DRIVER_NAME ": "
  16
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/delay.h>
  21 #include <asm/pmac_feature.h>
  22
  23 #include "orinoco.h"
  24
  25 #define AIRPORT_IO_LEN  (0x1000)        /* one page */
  26
  27 struct airport {
  28         struct macio_dev *mdev;
  29         void __iomem *vaddr;
  30         int irq_requested;
  31         int ndev_registered;
  32 };
  33
  34 static int
  35 airport_suspend(struct macio_dev *mdev, pm_message_t state)
  36 {
  37         struct net_device *dev = dev_get_drvdata(&mdev->ofdev.dev);
  38         struct orinoco_private *priv = netdev_priv(dev);
  39         unsigned long flags;
  40         int err;
  41
  42         printk(KERN_DEBUG "%s: Airport entering sleep mode\n", dev->name);
  43
  44         err = orinoco_lock(priv, &flags);
  45         if (err) {
  46                 printk(KERN_ERR "%s: hw_unavailable on PBOOK_SLEEP_NOW\n",
  47                        dev->name);
  48                 return 0;
  49         }
  50
  51         err = __orinoco_down(dev);
  52         if (err)
  53                 printk(KERN_WARNING "%s: PBOOK_SLEEP_NOW: Error %d downing interface\n",
  54                        dev->name, err);
  55
  56         netif_device_detach(dev);
  57
  58         priv->hw_unavailable++;
  59
  60         orinoco_unlock(priv, &flags);
  61
  62         disable_irq(dev->irq);
  63         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(mdev), 0, 0);
  64
  65         return 0;
  66 }
  67
  68 static int
  69 airport_resume(struct macio_dev *mdev)
  70 {
  71         struct net_device *dev = dev_get_drvdata(&mdev->ofdev.dev);
  72         struct orinoco_private *priv = netdev_priv(dev);
  73         unsigned long flags;
  74         int err;
  75
  76         printk(KERN_DEBUG "%s: Airport waking up\n", dev->name);
  77
  78         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(mdev), 0, 1);
  79         msleep(200);
  80
  81         enable_irq(dev->irq);
  82
  83         err = orinoco_reinit_firmware(dev);
  84         if (err) {
  85                 printk(KERN_ERR "%s: Error %d re-initializing firmware on PBOOK_WAKE\n",
  86                        dev->name, err);
  87                 return 0;
  88         }
  89
  90         spin_lock_irqsave(&priv->lock, flags);
  91
  92         netif_device_attach(dev);
  93
  94         priv->hw_unavailable--;
  95
  96         if (priv->open && (! priv->hw_unavailable)) {
  97                 err = __orinoco_up(dev);
  98                 if (err)
  99                         printk(KERN_ERR "%s: Error %d restarting card on PBOOK_WAKE\n",
 100                                dev->name, err);
 101         }
 102
 103
 104         spin_unlock_irqrestore(&priv->lock, flags);
 105
 106         return 0;
 107 }
 108
 109 static int
 110 airport_detach(struct macio_dev *mdev)
 111 {
 112         struct net_device *dev = dev_get_drvdata(&mdev->ofdev.dev);
 113         struct orinoco_private *priv = netdev_priv(dev);
 114         struct airport *card = priv->card;
 115
 116         if (card->ndev_registered)
 117                 unregister_netdev(dev);
 118         card->ndev_registered = 0;
 119
 120         if (card->irq_requested)
 121                 free_irq(dev->irq, dev);
 122         card->irq_requested = 0;
 123
 124         if (card->vaddr)
 125                 iounmap(card->vaddr);
 126         card->vaddr = NULL;
 127
 128         macio_release_resource(mdev, 0);
 129
 130         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(mdev), 0, 0);
 131         ssleep(1);
 132
 133         macio_set_drvdata(mdev, NULL);
 134         free_orinocodev(dev);
 135
 136         return 0;
 137 }
 138
 139 static int airport_hard_reset(struct orinoco_private *priv)
 140 {
 141         /* It would be nice to power cycle the Airport for a real hard
 142          * reset, but for some reason although it appears to
 143          * re-initialize properly, it falls in a screaming heap
 144          * shortly afterwards. */
 145 #if 0
 146         struct net_device *dev = priv->ndev;
 147         struct airport *card = priv->card;
 148
 149         /* Vitally important.  If we don't do this it seems we get an
 150          * interrupt somewhere during the power cycle, since
 151          * hw_unavailable is already set it doesn't get ACKed, we get
 152          * into an interrupt loop and the PMU decides to turn us
 153          * off. */
 154         disable_irq(dev->irq);
 155
 156         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(card->mdev), 0, 0);
 157         ssleep(1);
 158         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(card->mdev), 0, 1);
 159         ssleep(1);
 160
 161         enable_irq(dev->irq);
 162         ssleep(1);
 163 #endif
 164
 165         return 0;
 166 }
 167
 168 static int
 169 airport_attach(struct macio_dev *mdev, const struct of_device_id *match)
 170 {
 171         struct orinoco_private *priv;
 172         struct net_device *dev;
 173         struct airport *card;
 174         unsigned long phys_addr;
 175         hermes_t *hw;
 176
 177         if (macio_resource_count(mdev) < 1 || macio_irq_count(mdev) < 1) {
 178                 printk(KERN_ERR PFX "Wrong interrupt/addresses in OF tree\n");
 179                 return -ENODEV;
 180         }
 181
 182         /* Allocate space for private device-specific data */
 183         dev = alloc_orinocodev(sizeof(*card), airport_hard_reset);
 184         if (! dev) {
 185                 printk(KERN_ERR PFX "Cannot allocate network device\n");
 186                 return -ENODEV;
 187         }
 188         priv = netdev_priv(dev);
 189         card = priv->card;
 190
 191         hw = &priv->hw;
 192         card->mdev = mdev;
 193
 194         if (macio_request_resource(mdev, 0, "airport")) {
 195                 printk(KERN_ERR PFX "can't request IO resource !\n");
 196                 free_orinocodev(dev);
 197                 return -EBUSY;
 198         }
 199
 200         SET_MODULE_OWNER(dev);
 201         SET_NETDEV_DEV(dev, &mdev->ofdev.dev);
 202
 203         macio_set_drvdata(mdev, dev);
 204
 205         /* Setup interrupts & base address */
 206         dev->irq = macio_irq(mdev, 0);
 207         phys_addr = macio_resource_start(mdev, 0);  /* Physical address */
 208         printk(KERN_DEBUG PFX "Physical address %lx\n", phys_addr);
 209         dev->base_addr = phys_addr;
 210         card->vaddr = ioremap(phys_addr, AIRPORT_IO_LEN);
 211         if (!card->vaddr) {
 212                 printk(KERN_ERR PFX "ioremap() failed\n");
 213                 goto failed;
 214         }
 215
 216         hermes_struct_init(hw, card->vaddr, HERMES_16BIT_REGSPACING);
 217
 218         /* Power up card */
 219         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(mdev), 0, 1);
 220         ssleep(1);
 221
 222         /* Reset it before we get the interrupt */
 223         hermes_init(hw);
 224
 225         if (request_irq(dev->irq, orinoco_interrupt, 0, dev->name, dev)) {
 226                 printk(KERN_ERR PFX "Couldn't get IRQ %d\n", dev->irq);
 227                 goto failed;
 228         }
 229         card->irq_requested = 1;
 230
 231         /* Tell the stack we exist */
 232         if (register_netdev(dev) != 0) {
 233                 printk(KERN_ERR PFX "register_netdev() failed\n");
 234                 goto failed;
 235         }
 236         printk(KERN_DEBUG PFX "Card registered for interface %s\n", dev->name);
 237         card->ndev_registered = 1;
 238         return 0;
 239  failed:
 240         airport_detach(mdev);
 241         return -ENODEV;
 242 }                               /* airport_attach */
 243
 244
 245 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
 246         " (Benjamin Herrenschmidt <benh@kernel.crashing.org>)";
 247 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 248 MODULE_DESCRIPTION("Driver for the Apple Airport wireless card.");
 249 MODULE_LICENSE("Dual MPL/GPL");
 250
 251 static struct of_device_id airport_match[] =
 252 {
 253         {
 254         .name           = "radio",
 255         },
 256         {},
 257 };
 258
 259 MODULE_DEVICE_TABLE (of, airport_match);
 260
 261 static struct macio_driver airport_driver =
 262 {
 263         .name           = DRIVER_NAME,
 264         .match_table    = airport_match,
 265         .probe          = airport_attach,
 266         .remove         = airport_detach,
 267         .suspend        = airport_suspend,
 268         .resume         = airport_resume,
 269 };
 270
 271 static int __init
 272 init_airport(void)
 273 {
 274         printk(KERN_DEBUG "%s\n", version);
 275
 276         return macio_register_driver(&airport_driver);
 277 }
 278
 279 static void __exit
 280 exit_airport(void)
 281 {
 282         return macio_unregister_driver(&airport_driver);
 283 }
 284
 285 module_init(init_airport);
 286 module_exit(exit_airport);