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