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