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
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/slab.h>
  24 #include <linux/string.h>
  25 #include <linux/timer.h>
  26 #include <linux/ioport.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/if_arp.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/wireless.h>
  31
  32 #include <asm/io.h>
  33 #include <asm/system.h>
  34 #include <asm/current.h>
  35 #include <asm/prom.h>
  36 #include <asm/machdep.h>
  37 #include <asm/pmac_feature.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40
  41 #include "orinoco.h"
  42
  43 #define AIRPORT_IO_LEN  (0x1000)        /* one page */
  44
  45 struct airport {
  46         struct macio_dev *mdev;
  47         void __iomem *vaddr;
  48         int irq_requested;
  49         int ndev_registered;
  50 };
  51
  52 static int
  53 airport_suspend(struct macio_dev *mdev, pm_message_t state)
  54 {
  55         struct net_device *dev = dev_get_drvdata(&mdev->ofdev.dev);
  56         struct orinoco_private *priv = netdev_priv(dev);
  57         unsigned long flags;
  58         int err;
  59
  60         printk(KERN_DEBUG "%s: Airport entering sleep mode\n", dev->name);
  61
  62         err = orinoco_lock(priv, &flags);
  63         if (err) {
  64                 printk(KERN_ERR "%s: hw_unavailable on PBOOK_SLEEP_NOW\n",
  65                        dev->name);
  66                 return 0;
  67         }
  68
  69         err = __orinoco_down(dev);
  70         if (err)
  71                 printk(KERN_WARNING "%s: PBOOK_SLEEP_NOW: Error %d downing interface\n",
  72                        dev->name, err);
  73
  74         netif_device_detach(dev);
  75
  76         priv->hw_unavailable++;
  77
  78         orinoco_unlock(priv, &flags);
  79
  80         disable_irq(dev->irq);
  81         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(mdev), 0, 0);
  82
  83         return 0;
  84 }
  85
  86 static int
  87 airport_resume(struct macio_dev *mdev)
  88 {
  89         struct net_device *dev = dev_get_drvdata(&mdev->ofdev.dev);
  90         struct orinoco_private *priv = netdev_priv(dev);
  91         unsigned long flags;
  92         int err;
  93
  94         printk(KERN_DEBUG "%s: Airport waking up\n", dev->name);
  95
  96         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(mdev), 0, 1);
  97         msleep(200);
  98
  99         enable_irq(dev->irq);
 100
 101         err = orinoco_reinit_firmware(dev);
 102         if (err) {
 103                 printk(KERN_ERR "%s: Error %d re-initializing firmware on PBOOK_WAKE\n",
 104                        dev->name, err);
 105                 return 0;
 106         }
 107
 108         spin_lock_irqsave(&priv->lock, flags);
 109
 110         netif_device_attach(dev);
 111
 112         priv->hw_unavailable--;
 113
 114         if (priv->open && (! priv->hw_unavailable)) {
 115                 err = __orinoco_up(dev);
 116                 if (err)
 117                         printk(KERN_ERR "%s: Error %d restarting card on PBOOK_WAKE\n",
 118                                dev->name, err);
 119         }
 120
 121
 122         spin_unlock_irqrestore(&priv->lock, flags);
 123
 124         return 0;
 125 }
 126
 127 static int
 128 airport_detach(struct macio_dev *mdev)
 129 {
 130         struct net_device *dev = dev_get_drvdata(&mdev->ofdev.dev);
 131         struct orinoco_private *priv = netdev_priv(dev);
 132         struct airport *card = priv->card;
 133
 134         if (card->ndev_registered)
 135                 unregister_netdev(dev);
 136         card->ndev_registered = 0;
 137
 138         if (card->irq_requested)
 139                 free_irq(dev->irq, dev);
 140         card->irq_requested = 0;
 141
 142         if (card->vaddr)
 143                 iounmap(card->vaddr);
 144         card->vaddr = NULL;
 145
 146         macio_release_resource(mdev, 0);
 147
 148         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(mdev), 0, 0);
 149         ssleep(1);
 150
 151         macio_set_drvdata(mdev, NULL);
 152         free_orinocodev(dev);
 153
 154         return 0;
 155 }
 156
 157 static int airport_hard_reset(struct orinoco_private *priv)
 158 {
 159         /* It would be nice to power cycle the Airport for a real hard
 160          * reset, but for some reason although it appears to
 161          * re-initialize properly, it falls in a screaming heap
 162          * shortly afterwards. */
 163 #if 0
 164         struct net_device *dev = priv->ndev;
 165         struct airport *card = priv->card;
 166
 167         /* Vitally important.  If we don't do this it seems we get an
 168          * interrupt somewhere during the power cycle, since
 169          * hw_unavailable is already set it doesn't get ACKed, we get
 170          * into an interrupt loop and the the PMU decides to turn us
 171          * off. */
 172         disable_irq(dev->irq);
 173
 174         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(card->mdev), 0, 0);
 175         ssleep(1);
 176         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(card->mdev), 0, 1);
 177         ssleep(1);
 178
 179         enable_irq(dev->irq);
 180         ssleep(1);
 181 #endif
 182
 183         return 0;
 184 }
 185
 186 static int
 187 airport_attach(struct macio_dev *mdev, const struct of_device_id *match)
 188 {
 189         struct orinoco_private *priv;
 190         struct net_device *dev;
 191         struct airport *card;
 192         unsigned long phys_addr;
 193         hermes_t *hw;
 194
 195         if (macio_resource_count(mdev) < 1 || macio_irq_count(mdev) < 1) {
 196                 printk(KERN_ERR PFX "Wrong interrupt/addresses in OF tree\n");
 197                 return -ENODEV;
 198         }
 199
 200         /* Allocate space for private device-specific data */
 201         dev = alloc_orinocodev(sizeof(*card), airport_hard_reset);
 202         if (! dev) {
 203                 printk(KERN_ERR PFX "Cannot allocate network device\n");
 204                 return -ENODEV;
 205         }
 206         priv = netdev_priv(dev);
 207         card = priv->card;
 208
 209         hw = &priv->hw;
 210         card->mdev = mdev;
 211
 212         if (macio_request_resource(mdev, 0, "airport")) {
 213                 printk(KERN_ERR PFX "can't request IO resource !\n");
 214                 free_orinocodev(dev);
 215                 return -EBUSY;
 216         }
 217
 218         SET_MODULE_OWNER(dev);
 219         SET_NETDEV_DEV(dev, &mdev->ofdev.dev);
 220
 221         macio_set_drvdata(mdev, dev);
 222
 223         /* Setup interrupts & base address */
 224         dev->irq = macio_irq(mdev, 0);
 225         phys_addr = macio_resource_start(mdev, 0);  /* Physical address */
 226         printk(KERN_DEBUG PFX "Physical address %lx\n", phys_addr);
 227         dev->base_addr = phys_addr;
 228         card->vaddr = ioremap(phys_addr, AIRPORT_IO_LEN);
 229         if (!card->vaddr) {
 230                 printk(KERN_ERR PFX "ioremap() failed\n");
 231                 goto failed;
 232         }
 233
 234         hermes_struct_init(hw, card->vaddr, HERMES_16BIT_REGSPACING);
 235
 236         /* Power up card */
 237         pmac_call_feature(PMAC_FTR_AIRPORT_ENABLE, macio_get_of_node(mdev), 0, 1);
 238         ssleep(1);
 239
 240         /* Reset it before we get the interrupt */
 241         hermes_init(hw);
 242
 243         if (request_irq(dev->irq, orinoco_interrupt, 0, dev->name, dev)) {
 244                 printk(KERN_ERR PFX "Couldn't get IRQ %d\n", dev->irq);
 245                 goto failed;
 246         }
 247         card->irq_requested = 1;
 248
 249         /* Tell the stack we exist */
 250         if (register_netdev(dev) != 0) {
 251                 printk(KERN_ERR PFX "register_netdev() failed\n");
 252                 goto failed;
 253         }
 254         printk(KERN_DEBUG PFX "Card registered for interface %s\n", dev->name);
 255         card->ndev_registered = 1;
 256         return 0;
 257  failed:
 258         airport_detach(mdev);
 259         return -ENODEV;
 260 }                               /* airport_attach */
 261
 262
 263 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
 264         " (Benjamin Herrenschmidt <benh@kernel.crashing.org>)";
 265 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 266 MODULE_DESCRIPTION("Driver for the Apple Airport wireless card.");
 267 MODULE_LICENSE("Dual MPL/GPL");
 268
 269 static struct of_device_id airport_match[] =
 270 {
 271         {
 272         .name           = "radio",
 273         },
 274         {},
 275 };
 276
 277 MODULE_DEVICE_TABLE (of, airport_match);
 278
 279 static struct macio_driver airport_driver =
 280 {
 281         .name           = DRIVER_NAME,
 282         .match_table    = airport_match,
 283         .probe          = airport_attach,
 284         .remove         = airport_detach,
 285         .suspend        = airport_suspend,
 286         .resume         = airport_resume,
 287 };
 288
 289 static int __init
 290 init_airport(void)
 291 {
 292         printk(KERN_DEBUG "%s\n", version);
 293
 294         return macio_register_driver(&airport_driver);
 295 }
 296
 297 static void __exit
 298 exit_airport(void)
 299 {
 300         return macio_unregister_driver(&airport_driver);
 301 }
 302
 303 module_init(init_airport);
 304 module_exit(exit_airport);