1 /* orinoco_plx.c
2 *
3 * Driver for Prism II devices which would usually be driven by orinoco_cs,
4 * but are connected to the PCI bus by a PLX9052.
5 *
6 * Current maintainers are:
7 * Pavel Roskin <proski AT gnu.org>
8 * and David Gibson <hermes AT gibson.dropbear.id.au>
9 *
10 * (C) Copyright David Gibson, IBM Corp. 2001-2003.
11 * Copyright (C) 2001 Daniel Barlow
12 *
13 * The contents of this file are subject to the Mozilla Public License
14 * Version 1.1 (the "License"); you may not use this file except in
15 * compliance with the License. You may obtain a copy of the License
16 * at http://www.mozilla.org/MPL/
17 *
18 * Software distributed under the License is distributed on an "AS IS"
19 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
20 * the License for the specific language governing rights and
21 * limitations under the License.
22 *
23 * Alternatively, the contents of this file may be used under the
24 * terms of the GNU General Public License version 2 (the "GPL"), in
25 * which case the provisions of the GPL are applicable instead of the
26 * above. If you wish to allow the use of your version of this file
27 * only under the terms of the GPL and not to allow others to use your
28 * version of this file under the MPL, indicate your decision by
29 * deleting the provisions above and replace them with the notice and
30 * other provisions required by the GPL. If you do not delete the
31 * provisions above, a recipient may use your version of this file
32 * under either the MPL or the GPL.
33 *
34 * Here's the general details on how the PLX9052 adapter works:
35 *
36 * - Two PCI I/O address spaces, one 0x80 long which contains the
37 * PLX9052 registers, and one that's 0x40 long mapped to the PCMCIA
38 * slot I/O address space.
39 *
40 * - One PCI memory address space, mapped to the PCMCIA attribute space
41 * (containing the CIS).
42 *
43 * Using the later, you can read through the CIS data to make sure the
44 * card is compatible with the driver. Keep in mind that the PCMCIA
45 * spec specifies the CIS as the lower 8 bits of each word read from
46 * the CIS, so to read the bytes of the CIS, read every other byte
47 * (0,2,4,...). Passing that test, you need to enable the I/O address
48 * space on the PCMCIA card via the PCMCIA COR register. This is the
49 * first byte following the CIS. In my case (which may not have any
50 * relation to what's on the PRISM2 cards), COR was at offset 0x800
51 * within the PCI memory space. Write 0x41 to the COR register to
52 * enable I/O mode and to select level triggered interrupts. To
53 * confirm you actually succeeded, read the COR register back and make
54 * sure it actually got set to 0x41, in case you have an unexpected
55 * card inserted.
56 *
57 * Following that, you can treat the second PCI I/O address space (the
58 * one that's not 0x80 in length) as the PCMCIA I/O space.
59 *
60 * Note that in the Eumitcom's source for their drivers, they register
61 * the interrupt as edge triggered when registering it with the
62 * Windows kernel. I don't recall how to register edge triggered on
63 * Linux (if it can be done at all). But in some experimentation, I
64 * don't see much operational difference between using either
65 * interrupt mode. Don't mess with the interrupt mode in the COR
66 * register though, as the PLX9052 wants level triggers with the way
67 * the serial EEPROM configures it on the WL11000.
68 *
69 * There's some other little quirks related to timing that I bumped
70 * into, but I don't recall right now. Also, there's two variants of
71 * the WL11000 I've seen, revision A1 and T2. These seem to differ
72 * slightly in the timings configured in the wait-state generator in
73 * the PLX9052. There have also been some comments from Eumitcom that
74 * cards shouldn't be hot swapped, apparently due to risk of cooking
75 * the PLX9052. I'm unsure why they believe this, as I can't see
76 * anything in the design that would really cause a problem, except
77 * for crashing drivers not written to expect it. And having developed
78 * drivers for the WL11000, I'd say it's quite tricky to write code
79 * that will successfully deal with a hot unplug. Very odd things
80 * happen on the I/O side of things. But anyway, be warned. Despite
81 * that, I've hot-swapped a number of times during debugging and
82 * driver development for various reasons (stuck WAIT# line after the
83 * radio card's firmware locks up).
84 */
85
86 #define DRIVER_NAME "orinoco_plx"
87 #define PFX DRIVER_NAME ": "
88
89 #include <linux/module.h>
90 #include <linux/kernel.h>
91 #include <linux/init.h>
92 #include <linux/delay.h>
93 #include <linux/pci.h>
94 #include <pcmcia/cisreg.h>
95
96 #include "orinoco.h"
97 #include "orinoco_pci.h"
98
99 #define COR_OFFSET (0x3e0) /* COR attribute offset of Prism2 PC card */
100 #define COR_VALUE (COR_LEVEL_REQ | COR_FUNC_ENA) /* Enable PC card with interrupt in level trigger */
101 #define COR_RESET (0x80) /* reset bit in the COR register */
102 #define PLX_RESET_TIME (500) /* milliseconds */
103
104 #define PLX_INTCSR 0x4c /* Interrupt Control & Status Register */
105 #define PLX_INTCSR_INTEN (1<<6) /* Interrupt Enable bit */
106
107 /*
108 * Do a soft reset of the card using the Configuration Option Register
109 */
orinoco_plx_cor_reset(struct orinoco_private * priv)110 static int orinoco_plx_cor_reset(struct orinoco_private *priv)
111 {
112 hermes_t *hw = &priv->hw;
113 struct orinoco_pci_card *card = priv->card;
114 unsigned long timeout;
115 u16 reg;
116
117 iowrite8(COR_VALUE | COR_RESET, card->attr_io + COR_OFFSET);
118 mdelay(1);
119
120 iowrite8(COR_VALUE, card->attr_io + COR_OFFSET);
121 mdelay(1);
122
123 /* Just in case, wait more until the card is no longer busy */
124 timeout = jiffies + (PLX_RESET_TIME * HZ / 1000);
125 reg = hermes_read_regn(hw, CMD);
126 while (time_before(jiffies, timeout) && (reg & HERMES_CMD_BUSY)) {
127 mdelay(1);
128 reg = hermes_read_regn(hw, CMD);
129 }
130
131 /* Still busy? */
132 if (reg & HERMES_CMD_BUSY) {
133 printk(KERN_ERR PFX "Busy timeout\n");
134 return -ETIMEDOUT;
135 }
136
137 return 0;
138 }
139
orinoco_plx_hw_init(struct orinoco_pci_card * card)140 static int orinoco_plx_hw_init(struct orinoco_pci_card *card)
141 {
142 int i;
143 u32 csr_reg;
144 static const u8 cis_magic[] = {
145 0x01, 0x03, 0x00, 0x00, 0xff, 0x17, 0x04, 0x67
146 };
147
148 printk(KERN_DEBUG PFX "CIS: ");
149 for (i = 0; i < 16; i++) {
150 printk("%02X:", ioread8(card->attr_io + (i << 1)));
151 }
152 printk("\n");
153
154 /* Verify whether a supported PC card is present */
155 /* FIXME: we probably need to be smarted about this */
156 for (i = 0; i < sizeof(cis_magic); i++) {
157 if (cis_magic[i] != ioread8(card->attr_io + (i << 1))) {
158 printk(KERN_ERR PFX "The CIS value of Prism2 PC "
159 "card is unexpected\n");
160 return -ENODEV;
161 }
162 }
163
164 /* bjoern: We need to tell the card to enable interrupts, in
165 case the serial eprom didn't do this already. See the
166 PLX9052 data book, p8-1 and 8-24 for reference. */
167 csr_reg = ioread32(card->bridge_io + PLX_INTCSR);
168 if (!(csr_reg & PLX_INTCSR_INTEN)) {
169 csr_reg |= PLX_INTCSR_INTEN;
170 iowrite32(csr_reg, card->bridge_io + PLX_INTCSR);
171 csr_reg = ioread32(card->bridge_io + PLX_INTCSR);
172 if (!(csr_reg & PLX_INTCSR_INTEN)) {
173 printk(KERN_ERR PFX "Cannot enable interrupts\n");
174 return -EIO;
175 }
176 }
177
178 return 0;
179 }
180
orinoco_plx_init_one(struct pci_dev * pdev,const struct pci_device_id * ent)181 static int orinoco_plx_init_one(struct pci_dev *pdev,
182 const struct pci_device_id *ent)
183 {
184 int err;
185 struct orinoco_private *priv;
186 struct orinoco_pci_card *card;
187 struct net_device *dev;
188 void __iomem *hermes_io, *attr_io, *bridge_io;
189
190 err = pci_enable_device(pdev);
191 if (err) {
192 printk(KERN_ERR PFX "Cannot enable PCI device\n");
193 return err;
194 }
195
196 err = pci_request_regions(pdev, DRIVER_NAME);
197 if (err) {
198 printk(KERN_ERR PFX "Cannot obtain PCI resources\n");
199 goto fail_resources;
200 }
201
202 bridge_io = pci_iomap(pdev, 1, 0);
203 if (!bridge_io) {
204 printk(KERN_ERR PFX "Cannot map bridge registers\n");
205 err = -EIO;
206 goto fail_map_bridge;
207 }
208
209 attr_io = pci_iomap(pdev, 2, 0);
210 if (!attr_io) {
211 printk(KERN_ERR PFX "Cannot map PCMCIA attributes\n");
212 err = -EIO;
213 goto fail_map_attr;
214 }
215
216 hermes_io = pci_iomap(pdev, 3, 0);
217 if (!hermes_io) {
218 printk(KERN_ERR PFX "Cannot map chipset registers\n");
219 err = -EIO;
220 goto fail_map_hermes;
221 }
222
223 /* Allocate network device */
224 dev = alloc_orinocodev(sizeof(*card), &pdev->dev,
225 orinoco_plx_cor_reset, NULL);
226 if (!dev) {
227 printk(KERN_ERR PFX "Cannot allocate network device\n");
228 err = -ENOMEM;
229 goto fail_alloc;
230 }
231
232 priv = netdev_priv(dev);
233 card = priv->card;
234 card->bridge_io = bridge_io;
235 card->attr_io = attr_io;
236 SET_NETDEV_DEV(dev, &pdev->dev);
237
238 hermes_struct_init(&priv->hw, hermes_io, HERMES_16BIT_REGSPACING);
239
240 err = request_irq(pdev->irq, orinoco_interrupt, IRQF_SHARED,
241 dev->name, dev);
242 if (err) {
243 printk(KERN_ERR PFX "Cannot allocate IRQ %d\n", pdev->irq);
244 err = -EBUSY;
245 goto fail_irq;
246 }
247
248 err = orinoco_plx_hw_init(card);
249 if (err) {
250 printk(KERN_ERR PFX "Hardware initialization failed\n");
251 goto fail;
252 }
253
254 err = orinoco_plx_cor_reset(priv);
255 if (err) {
256 printk(KERN_ERR PFX "Initial reset failed\n");
257 goto fail;
258 }
259
260 err = register_netdev(dev);
261 if (err) {
262 printk(KERN_ERR PFX "Cannot register network device\n");
263 goto fail;
264 }
265
266 pci_set_drvdata(pdev, dev);
267 printk(KERN_DEBUG "%s: " DRIVER_NAME " at %s\n", dev->name,
268 pci_name(pdev));
269
270 return 0;
271
272 fail:
273 free_irq(pdev->irq, dev);
274
275 fail_irq:
276 pci_set_drvdata(pdev, NULL);
277 free_orinocodev(dev);
278
279 fail_alloc:
280 pci_iounmap(pdev, hermes_io);
281
282 fail_map_hermes:
283 pci_iounmap(pdev, attr_io);
284
285 fail_map_attr:
286 pci_iounmap(pdev, bridge_io);
287
288 fail_map_bridge:
289 pci_release_regions(pdev);
290
291 fail_resources:
292 pci_disable_device(pdev);
293
294 return err;
295 }
296
orinoco_plx_remove_one(struct pci_dev * pdev)297 static void __devexit orinoco_plx_remove_one(struct pci_dev *pdev)
298 {
299 struct net_device *dev = pci_get_drvdata(pdev);
300 struct orinoco_private *priv = netdev_priv(dev);
301 struct orinoco_pci_card *card = priv->card;
302
303 unregister_netdev(dev);
304 free_irq(pdev->irq, dev);
305 pci_set_drvdata(pdev, NULL);
306 free_orinocodev(dev);
307 pci_iounmap(pdev, priv->hw.iobase);
308 pci_iounmap(pdev, card->attr_io);
309 pci_iounmap(pdev, card->bridge_io);
310 pci_release_regions(pdev);
311 pci_disable_device(pdev);
312 }
313
314 static struct pci_device_id orinoco_plx_id_table[] = {
315 {0x111a, 0x1023, PCI_ANY_ID, PCI_ANY_ID,}, /* Siemens SpeedStream SS1023 */
316 {0x1385, 0x4100, PCI_ANY_ID, PCI_ANY_ID,}, /* Netgear MA301 */
317 {0x15e8, 0x0130, PCI_ANY_ID, PCI_ANY_ID,}, /* Correga - does this work? */
318 {0x1638, 0x1100, PCI_ANY_ID, PCI_ANY_ID,}, /* SMC EZConnect SMC2602W,
319 Eumitcom PCI WL11000,
320 Addtron AWA-100 */
321 {0x16ab, 0x1100, PCI_ANY_ID, PCI_ANY_ID,}, /* Global Sun Tech GL24110P */
322 {0x16ab, 0x1101, PCI_ANY_ID, PCI_ANY_ID,}, /* Reported working, but unknown */
323 {0x16ab, 0x1102, PCI_ANY_ID, PCI_ANY_ID,}, /* Linksys WDT11 */
324 {0x16ec, 0x3685, PCI_ANY_ID, PCI_ANY_ID,}, /* USR 2415 */
325 {0xec80, 0xec00, PCI_ANY_ID, PCI_ANY_ID,}, /* Belkin F5D6000 tested by
326 Brendan W. McAdams <rit AT jacked-in.org> */
327 {0x10b7, 0x7770, PCI_ANY_ID, PCI_ANY_ID,}, /* 3Com AirConnect PCI tested by
328 Damien Persohn <damien AT persohn.net> */
329 {0,},
330 };
331
332 MODULE_DEVICE_TABLE(pci, orinoco_plx_id_table);
333
334 static struct pci_driver orinoco_plx_driver = {
335 .name = DRIVER_NAME,
336 .id_table = orinoco_plx_id_table,
337 .probe = orinoco_plx_init_one,
338 .remove = __devexit_p(orinoco_plx_remove_one),
339 .suspend = orinoco_pci_suspend,
340 .resume = orinoco_pci_resume,
341 };
342
343 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
344 " (Pavel Roskin <proski@gnu.org>,"
345 " David Gibson <hermes@gibson.dropbear.id.au>,"
346 " Daniel Barlow <dan@telent.net>)";
347 MODULE_AUTHOR("Daniel Barlow <dan@telent.net>");
348 MODULE_DESCRIPTION("Driver for wireless LAN cards using the PLX9052 PCI bridge");
349 MODULE_LICENSE("Dual MPL/GPL");
350
orinoco_plx_init(void)351 static int __init orinoco_plx_init(void)
352 {
353 printk(KERN_DEBUG "%s\n", version);
354 return pci_register_driver(&orinoco_plx_driver);
355 }
356
orinoco_plx_exit(void)357 static void __exit orinoco_plx_exit(void)
358 {
359 pci_unregister_driver(&orinoco_plx_driver);
360 }
361
362 module_init(orinoco_plx_init);
363 module_exit(orinoco_plx_exit);
364
365 /*
366 * Local variables:
367 * c-indent-level: 8
368 * c-basic-offset: 8
369 * tab-width: 8
370 * End:
371 */
372