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/of_device.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