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