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
 27struct airport {
 28	struct macio_dev *mdev;
 29	void __iomem *vaddr;
 30	unsigned int irq;
 31	int irq_requested;
 32	int ndev_registered;
 33};
 34
 35static int
 36airport_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
 63static int
 64airport_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	priv->hw.ops->lock_irqsave(&priv->lock, &flags);
 81	err = orinoco_up(priv);
 82	priv->hw.ops->unlock_irqrestore(&priv->lock, &flags);
 83
 84	return err;
 85}
 86
 87static int
 88airport_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
117static 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
147static int
148airport_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	struct hermes *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	hw->ops->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, NULL) != 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
225static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
226	" (Benjamin Herrenschmidt <benh@kernel.crashing.org>)";
227MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
228MODULE_DESCRIPTION("Driver for the Apple Airport wireless card.");
229MODULE_LICENSE("Dual MPL/GPL");
230
231static struct of_device_id airport_match[] = {
232	{
233	.name		= "radio",
234	},
235	{},
236};
237
238MODULE_DEVICE_TABLE(of, airport_match);
239
240static struct macio_driver airport_driver = {
241	.driver = {
242		.name		= DRIVER_NAME,
243		.owner		= THIS_MODULE,
244		.of_match_table	= airport_match,
245	},
246	.probe		= airport_attach,
247	.remove		= airport_detach,
248	.suspend	= airport_suspend,
249	.resume		= airport_resume,
250};
251
252static int __init
253init_airport(void)
254{
255	printk(KERN_DEBUG "%s\n", version);
256
257	return macio_register_driver(&airport_driver);
258}
259
260static void __exit
261exit_airport(void)
262{
263	macio_unregister_driver(&airport_driver);
264}
265
266module_init(init_airport);
267module_exit(exit_airport);