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  */
110 static int orinoco_plx_cor_reset(struct orinoco_private *priv)
111 {
112 	struct hermes *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 + msecs_to_jiffies(PLX_RESET_TIME);
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 
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 	printk("\n");
152 
153 	/* Verify whether a supported PC card is present */
154 	/* FIXME: we probably need to be smarted about this */
155 	for (i = 0; i < sizeof(cis_magic); i++) {
156 		if (cis_magic[i] != ioread8(card->attr_io + (i << 1))) {
157 			printk(KERN_ERR PFX "The CIS value of Prism2 PC "
158 			       "card is unexpected\n");
159 			return -ENODEV;
160 		}
161 	}
162 
163 	/* bjoern: We need to tell the card to enable interrupts, in
164 	   case the serial eprom didn't do this already.  See the
165 	   PLX9052 data book, p8-1 and 8-24 for reference. */
166 	csr_reg = ioread32(card->bridge_io + PLX_INTCSR);
167 	if (!(csr_reg & PLX_INTCSR_INTEN)) {
168 		csr_reg |= PLX_INTCSR_INTEN;
169 		iowrite32(csr_reg, card->bridge_io + PLX_INTCSR);
170 		csr_reg = ioread32(card->bridge_io + PLX_INTCSR);
171 		if (!(csr_reg & PLX_INTCSR_INTEN)) {
172 			printk(KERN_ERR PFX "Cannot enable interrupts\n");
173 			return -EIO;
174 		}
175 	}
176 
177 	return 0;
178 }
179 
180 static int orinoco_plx_init_one(struct pci_dev *pdev,
181 				const struct pci_device_id *ent)
182 {
183 	int err;
184 	struct orinoco_private *priv;
185 	struct orinoco_pci_card *card;
186 	void __iomem *hermes_io, *attr_io, *bridge_io;
187 
188 	err = pci_enable_device(pdev);
189 	if (err) {
190 		printk(KERN_ERR PFX "Cannot enable PCI device\n");
191 		return err;
192 	}
193 
194 	err = pci_request_regions(pdev, DRIVER_NAME);
195 	if (err) {
196 		printk(KERN_ERR PFX "Cannot obtain PCI resources\n");
197 		goto fail_resources;
198 	}
199 
200 	bridge_io = pci_iomap(pdev, 1, 0);
201 	if (!bridge_io) {
202 		printk(KERN_ERR PFX "Cannot map bridge registers\n");
203 		err = -EIO;
204 		goto fail_map_bridge;
205 	}
206 
207 	attr_io = pci_iomap(pdev, 2, 0);
208 	if (!attr_io) {
209 		printk(KERN_ERR PFX "Cannot map PCMCIA attributes\n");
210 		err = -EIO;
211 		goto fail_map_attr;
212 	}
213 
214 	hermes_io = pci_iomap(pdev, 3, 0);
215 	if (!hermes_io) {
216 		printk(KERN_ERR PFX "Cannot map chipset registers\n");
217 		err = -EIO;
218 		goto fail_map_hermes;
219 	}
220 
221 	/* Allocate network device */
222 	priv = alloc_orinocodev(sizeof(*card), &pdev->dev,
223 				orinoco_plx_cor_reset, NULL);
224 	if (!priv) {
225 		printk(KERN_ERR PFX "Cannot allocate network device\n");
226 		err = -ENOMEM;
227 		goto fail_alloc;
228 	}
229 
230 	card = priv->card;
231 	card->bridge_io = bridge_io;
232 	card->attr_io = attr_io;
233 
234 	hermes_struct_init(&priv->hw, hermes_io, HERMES_16BIT_REGSPACING);
235 
236 	err = request_irq(pdev->irq, orinoco_interrupt, IRQF_SHARED,
237 			  DRIVER_NAME, priv);
238 	if (err) {
239 		printk(KERN_ERR PFX "Cannot allocate IRQ %d\n", pdev->irq);
240 		err = -EBUSY;
241 		goto fail_irq;
242 	}
243 
244 	err = orinoco_plx_hw_init(card);
245 	if (err) {
246 		printk(KERN_ERR PFX "Hardware initialization failed\n");
247 		goto fail;
248 	}
249 
250 	err = orinoco_plx_cor_reset(priv);
251 	if (err) {
252 		printk(KERN_ERR PFX "Initial reset failed\n");
253 		goto fail;
254 	}
255 
256 	err = orinoco_init(priv);
257 	if (err) {
258 		printk(KERN_ERR PFX "orinoco_init() failed\n");
259 		goto fail;
260 	}
261 
262 	err = orinoco_if_add(priv, 0, 0, NULL);
263 	if (err) {
264 		printk(KERN_ERR PFX "orinoco_if_add() failed\n");
265 		goto fail_wiphy;
266 	}
267 
268 	pci_set_drvdata(pdev, priv);
269 
270 	return 0;
271 
272  fail_wiphy:
273 	wiphy_unregister(priv_to_wiphy(priv));
274  fail:
275 	free_irq(pdev->irq, priv);
276 
277  fail_irq:
278 	free_orinocodev(priv);
279 
280  fail_alloc:
281 	pci_iounmap(pdev, hermes_io);
282 
283  fail_map_hermes:
284 	pci_iounmap(pdev, attr_io);
285 
286  fail_map_attr:
287 	pci_iounmap(pdev, bridge_io);
288 
289  fail_map_bridge:
290 	pci_release_regions(pdev);
291 
292  fail_resources:
293 	pci_disable_device(pdev);
294 
295 	return err;
296 }
297 
298 static void orinoco_plx_remove_one(struct pci_dev *pdev)
299 {
300 	struct orinoco_private *priv = pci_get_drvdata(pdev);
301 	struct orinoco_pci_card *card = priv->card;
302 
303 	orinoco_if_del(priv);
304 	wiphy_unregister(priv_to_wiphy(priv));
305 	free_irq(pdev->irq, priv);
306 	free_orinocodev(priv);
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 const 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		= orinoco_plx_remove_one,
339 	.driver.pm	= &orinoco_pci_pm_ops,
340 };
341 
342 static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
343 	" (Pavel Roskin <proski@gnu.org>,"
344 	" David Gibson <hermes@gibson.dropbear.id.au>,"
345 	" Daniel Barlow <dan@telent.net>)";
346 MODULE_AUTHOR("Daniel Barlow <dan@telent.net>");
347 MODULE_DESCRIPTION("Driver for wireless LAN cards using the PLX9052 PCI bridge");
348 MODULE_LICENSE("Dual MPL/GPL");
349 
350 static int __init orinoco_plx_init(void)
351 {
352 	printk(KERN_DEBUG "%s\n", version);
353 	return pci_register_driver(&orinoco_plx_driver);
354 }
355 
356 static void __exit orinoco_plx_exit(void)
357 {
358 	pci_unregister_driver(&orinoco_plx_driver);
359 }
360 
361 module_init(orinoco_plx_init);
362 module_exit(orinoco_plx_exit);
363