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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / tokenring / abyss.c
blob515f122777abcb361891196de2fb5a95d9343a8e
1 /*
2 * abyss.c: Network driver for the Madge Smart 16/4 PCI Mk2 token ring card.
3 *
4 * Written 1999-2000 by Adam Fritzler
5 *
6 * This software may be used and distributed according to the terms
7 * of the GNU General Public License, incorporated herein by reference.
8 *
9 * This driver module supports the following cards:
10 * - Madge Smart 16/4 PCI Mk2
11 *
12 * Maintainer(s):
13 * AF Adam Fritzler
14 *
15 * Modification History:
16 * 30-Dec-99 AF Split off from the tms380tr driver.
17 * 22-Jan-00 AF Updated to use indirect read/writes
18 * 23-Nov-00 JG New PCI API, cleanups
19 *
20 *
21 * TODO:
22 * 1. See if we can use MMIO instead of inb/outb/inw/outw
23 * 2. Add support for Mk1 (has AT24 attached to the PCI
24 * config registers)
25 *
26 */
27
28 #include <linux/module.h>
29 #include <linux/kernel.h>
30 #include <linux/errno.h>
31 #include <linux/pci.h>
32 #include <linux/init.h>
33 #include <linux/netdevice.h>
34 #include <linux/trdevice.h>
35
36 #include <asm/system.h>
37 #include <asm/io.h>
38 #include <asm/irq.h>
39
40 #include "tms380tr.h"
41 #include "abyss.h" /* Madge-specific constants */
42
43 static char version[] __devinitdata =
44 "abyss.c: v1.02 23/11/2000 by Adam Fritzler\n";
45
46 #define ABYSS_IO_EXTENT 64
47
48 static DEFINE_PCI_DEVICE_TABLE(abyss_pci_tbl) = {
49 { PCI_VENDOR_ID_MADGE, PCI_DEVICE_ID_MADGE_MK2,
50 PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_NETWORK_TOKEN_RING << 8, 0x00ffffff, },
51 { } /* Terminating entry */
52 };
53 MODULE_DEVICE_TABLE(pci, abyss_pci_tbl);
54
55 MODULE_LICENSE("GPL");
56
57 static int abyss_open(struct net_device *dev);
58 static int abyss_close(struct net_device *dev);
59 static void abyss_enable(struct net_device *dev);
60 static int abyss_chipset_init(struct net_device *dev);
61 static void abyss_read_eeprom(struct net_device *dev);
62 static unsigned short abyss_setnselout_pins(struct net_device *dev);
63
64 static void at24_writedatabyte(unsigned long regaddr, unsigned char byte);
65 static int at24_sendfullcmd(unsigned long regaddr, unsigned char cmd, unsigned char addr);
66 static int at24_sendcmd(unsigned long regaddr, unsigned char cmd);
67 static unsigned char at24_readdatabit(unsigned long regaddr);
68 static unsigned char at24_readdatabyte(unsigned long regaddr);
69 static int at24_waitforack(unsigned long regaddr);
70 static int at24_waitfornack(unsigned long regaddr);
71 static void at24_setlines(unsigned long regaddr, unsigned char clock, unsigned char data);
72 static void at24_start(unsigned long regaddr);
73 static unsigned char at24_readb(unsigned long regaddr, unsigned char addr);
74
75 static unsigned short abyss_sifreadb(struct net_device *dev, unsigned short reg)
76 {
77 return inb(dev->base_addr + reg);
78 }
79
80 static unsigned short abyss_sifreadw(struct net_device *dev, unsigned short reg)
81 {
82 return inw(dev->base_addr + reg);
83 }
84
85 static void abyss_sifwriteb(struct net_device *dev, unsigned short val, unsigned short reg)
86 {
87 outb(val, dev->base_addr + reg);
88 }
89
90 static void abyss_sifwritew(struct net_device *dev, unsigned short val, unsigned short reg)
91 {
92 outw(val, dev->base_addr + reg);
93 }
94
95 static struct net_device_ops abyss_netdev_ops;
96
97 static int __devinit abyss_attach(struct pci_dev *pdev, const struct pci_device_id *ent)
98 {
99 static int versionprinted;
100 struct net_device *dev;
101 struct net_local *tp;
102 int ret, pci_irq_line;
103 unsigned long pci_ioaddr;
104
105 if (versionprinted++ == 0)
106 printk("%s", version);
107
108 if (pci_enable_device(pdev))
109 return -EIO;
110
111 /* Remove I/O space marker in bit 0. */
112 pci_irq_line = pdev->irq;
113 pci_ioaddr = pci_resource_start (pdev, 0);
114
115 /* At this point we have found a valid card. */
116
117 dev = alloc_trdev(sizeof(struct net_local));
118 if (!dev)
119 return -ENOMEM;
120
121 if (!request_region(pci_ioaddr, ABYSS_IO_EXTENT, dev->name)) {
122 ret = -EBUSY;
123 goto err_out_trdev;
124 }
125
126 ret = request_irq(pdev->irq, tms380tr_interrupt, IRQF_SHARED,
127 dev->name, dev);
128 if (ret)
129 goto err_out_region;
130
131 dev->base_addr = pci_ioaddr;
132 dev->irq = pci_irq_line;
133
134 printk("%s: Madge Smart 16/4 PCI Mk2 (Abyss)\n", dev->name);
135 printk("%s: IO: %#4lx IRQ: %d\n",
136 dev->name, pci_ioaddr, dev->irq);
137 /*
138 * The TMS SIF registers lay 0x10 above the card base address.
139 */
140 dev->base_addr += 0x10;
141
142 ret = tmsdev_init(dev, &pdev->dev);
143 if (ret) {
144 printk("%s: unable to get memory for dev->priv.\n",
145 dev->name);
146 goto err_out_irq;
147 }
148
149 abyss_read_eeprom(dev);
150
151 printk("%s: Ring Station Address: %pM\n", dev->name, dev->dev_addr);
152
153 tp = netdev_priv(dev);
154 tp->setnselout = abyss_setnselout_pins;
155 tp->sifreadb = abyss_sifreadb;
156 tp->sifreadw = abyss_sifreadw;
157 tp->sifwriteb = abyss_sifwriteb;
158 tp->sifwritew = abyss_sifwritew;
159
160 memcpy(tp->ProductID, "Madge PCI 16/4 Mk2", PROD_ID_SIZE + 1);
161
162 dev->netdev_ops = &abyss_netdev_ops;
163
164 pci_set_drvdata(pdev, dev);
165 SET_NETDEV_DEV(dev, &pdev->dev);
166
167 ret = register_netdev(dev);
168 if (ret)
169 goto err_out_tmsdev;
170 return 0;
171
172 err_out_tmsdev:
173 pci_set_drvdata(pdev, NULL);
174 tmsdev_term(dev);
175 err_out_irq:
176 free_irq(pdev->irq, dev);
177 err_out_region:
178 release_region(pci_ioaddr, ABYSS_IO_EXTENT);
179 err_out_trdev:
180 free_netdev(dev);
181 return ret;
182 }
183
184 static unsigned short abyss_setnselout_pins(struct net_device *dev)
185 {
186 unsigned short val = 0;
187 struct net_local *tp = netdev_priv(dev);
188
189 if(tp->DataRate == SPEED_4)
190 val |= 0x01; /* Set 4Mbps */
191 else
192 val |= 0x00; /* Set 16Mbps */
193
194 return val;
195 }
196
197 /*
198 * The following Madge boards should use this code:
199 * - Smart 16/4 PCI Mk2 (Abyss)
200 * - Smart 16/4 PCI Mk1 (PCI T)
201 * - Smart 16/4 Client Plus PnP (Big Apple)
202 * - Smart 16/4 Cardbus Mk2
203 *
204 * These access an Atmel AT24 SEEPROM using their glue chip registers.
205 *
206 */
207 static void at24_writedatabyte(unsigned long regaddr, unsigned char byte)
208 {
209 int i;
210
211 for (i = 0; i < 8; i++) {
212 at24_setlines(regaddr, 0, (byte >> (7-i))&0x01);
213 at24_setlines(regaddr, 1, (byte >> (7-i))&0x01);
214 at24_setlines(regaddr, 0, (byte >> (7-i))&0x01);
215 }
216 }
217
218 static int at24_sendfullcmd(unsigned long regaddr, unsigned char cmd, unsigned char addr)
219 {
220 if (at24_sendcmd(regaddr, cmd)) {
221 at24_writedatabyte(regaddr, addr);
222 return at24_waitforack(regaddr);
223 }
224 return 0;
225 }
226
227 static int at24_sendcmd(unsigned long regaddr, unsigned char cmd)
228 {
229 int i;
230
231 for (i = 0; i < 10; i++) {
232 at24_start(regaddr);
233 at24_writedatabyte(regaddr, cmd);
234 if (at24_waitforack(regaddr))
235 return 1;
236 }
237 return 0;
238 }
239
240 static unsigned char at24_readdatabit(unsigned long regaddr)
241 {
242 unsigned char val;
243
244 at24_setlines(regaddr, 0, 1);
245 at24_setlines(regaddr, 1, 1);
246 val = (inb(regaddr) & AT24_DATA)?1:0;
247 at24_setlines(regaddr, 1, 1);
248 at24_setlines(regaddr, 0, 1);
249 return val;
250 }
251
252 static unsigned char at24_readdatabyte(unsigned long regaddr)
253 {
254 unsigned char data = 0;
255 int i;
256
257 for (i = 0; i < 8; i++) {
258 data <<= 1;
259 data |= at24_readdatabit(regaddr);
260 }
261
262 return data;
263 }
264
265 static int at24_waitforack(unsigned long regaddr)
266 {
267 int i;
268
269 for (i = 0; i < 10; i++) {
270 if ((at24_readdatabit(regaddr) & 0x01) == 0x00)
271 return 1;
272 }
273 return 0;
274 }
275
276 static int at24_waitfornack(unsigned long regaddr)
277 {
278 int i;
279 for (i = 0; i < 10; i++) {
280 if ((at24_readdatabit(regaddr) & 0x01) == 0x01)
281 return 1;
282 }
283 return 0;
284 }
285
286 static void at24_setlines(unsigned long regaddr, unsigned char clock, unsigned char data)
287 {
288 unsigned char val = AT24_ENABLE;
289 if (clock)
290 val |= AT24_CLOCK;
291 if (data)
292 val |= AT24_DATA;
293
294 outb(val, regaddr);
295 tms380tr_wait(20); /* Very necessary. */
296 }
297
298 static void at24_start(unsigned long regaddr)
299 {
300 at24_setlines(regaddr, 0, 1);
301 at24_setlines(regaddr, 1, 1);
302 at24_setlines(regaddr, 1, 0);
303 at24_setlines(regaddr, 0, 1);
304 }
305
306 static unsigned char at24_readb(unsigned long regaddr, unsigned char addr)
307 {
308 unsigned char data = 0xff;
309
310 if (at24_sendfullcmd(regaddr, AT24_WRITE, addr)) {
311 if (at24_sendcmd(regaddr, AT24_READ)) {
312 data = at24_readdatabyte(regaddr);
313 if (!at24_waitfornack(regaddr))
314 data = 0xff;
315 }
316 }
317 return data;
318 }
319
320
321 /*
322 * Enable basic functions of the Madge chipset needed
323 * for initialization.
324 */
325 static void abyss_enable(struct net_device *dev)
326 {
327 unsigned char reset_reg;
328 unsigned long ioaddr;
329
330 ioaddr = dev->base_addr;
331 reset_reg = inb(ioaddr + PCIBM2_RESET_REG);
332 reset_reg |= PCIBM2_RESET_REG_CHIP_NRES;
333 outb(reset_reg, ioaddr + PCIBM2_RESET_REG);
334 tms380tr_wait(100);
335 }
336
337 /*
338 * Enable the functions of the Madge chipset needed for
339 * full working order.
340 */
341 static int abyss_chipset_init(struct net_device *dev)
342 {
343 unsigned char reset_reg;
344 unsigned long ioaddr;
345
346 ioaddr = dev->base_addr;
347
348 reset_reg = inb(ioaddr + PCIBM2_RESET_REG);
349
350 reset_reg |= PCIBM2_RESET_REG_CHIP_NRES;
351 outb(reset_reg, ioaddr + PCIBM2_RESET_REG);
352
353 reset_reg &= ~(PCIBM2_RESET_REG_CHIP_NRES |
354 PCIBM2_RESET_REG_FIFO_NRES |
355 PCIBM2_RESET_REG_SIF_NRES);
356 outb(reset_reg, ioaddr + PCIBM2_RESET_REG);
357
358 tms380tr_wait(100);
359
360 reset_reg |= PCIBM2_RESET_REG_CHIP_NRES;
361 outb(reset_reg, ioaddr + PCIBM2_RESET_REG);
362
363 reset_reg |= PCIBM2_RESET_REG_SIF_NRES;
364 outb(reset_reg, ioaddr + PCIBM2_RESET_REG);
365
366 reset_reg |= PCIBM2_RESET_REG_FIFO_NRES;
367 outb(reset_reg, ioaddr + PCIBM2_RESET_REG);
368
369 outb(PCIBM2_INT_CONTROL_REG_SINTEN |
370 PCIBM2_INT_CONTROL_REG_PCI_ERR_ENABLE,
371 ioaddr + PCIBM2_INT_CONTROL_REG);
372
373 outb(30, ioaddr + PCIBM2_FIFO_THRESHOLD);
374
375 return 0;
376 }
377
378 static inline void abyss_chipset_close(struct net_device *dev)
379 {
380 unsigned long ioaddr;
381
382 ioaddr = dev->base_addr;
383 outb(0, ioaddr + PCIBM2_RESET_REG);
384 }
385
386 /*
387 * Read configuration data from the AT24 SEEPROM on Madge cards.
388 *
389 */
390 static void abyss_read_eeprom(struct net_device *dev)
391 {
392 struct net_local *tp;
393 unsigned long ioaddr;
394 unsigned short val;
395 int i;
396
397 tp = netdev_priv(dev);
398 ioaddr = dev->base_addr;
399
400 /* Must enable glue chip first */
401 abyss_enable(dev);
402
403 val = at24_readb(ioaddr + PCIBM2_SEEPROM_REG,
404 PCIBM2_SEEPROM_RING_SPEED);
405 tp->DataRate = val?SPEED_4:SPEED_16; /* set open speed */
406 printk("%s: SEEPROM: ring speed: %dMb/sec\n", dev->name, tp->DataRate);
407
408 val = at24_readb(ioaddr + PCIBM2_SEEPROM_REG,
409 PCIBM2_SEEPROM_RAM_SIZE) * 128;
410 printk("%s: SEEPROM: adapter RAM: %dkb\n", dev->name, val);
411
412 dev->addr_len = 6;
413 for (i = 0; i < 6; i++)
414 dev->dev_addr[i] = at24_readb(ioaddr + PCIBM2_SEEPROM_REG,
415 PCIBM2_SEEPROM_BIA+i);
416 }
417
418 static int abyss_open(struct net_device *dev)
419 {
420 abyss_chipset_init(dev);
421 tms380tr_open(dev);
422 return 0;
423 }
424
425 static int abyss_close(struct net_device *dev)
426 {
427 tms380tr_close(dev);
428 abyss_chipset_close(dev);
429 return 0;
430 }
431
432 static void __devexit abyss_detach (struct pci_dev *pdev)
433 {
434 struct net_device *dev = pci_get_drvdata(pdev);
435
436 BUG_ON(!dev);
437 unregister_netdev(dev);
438 release_region(dev->base_addr-0x10, ABYSS_IO_EXTENT);
439 free_irq(dev->irq, dev);
440 tmsdev_term(dev);
441 free_netdev(dev);
442 pci_set_drvdata(pdev, NULL);
443 }
444
445 static struct pci_driver abyss_driver = {
446 .name = "abyss",
447 .id_table = abyss_pci_tbl,
448 .probe = abyss_attach,
449 .remove = __devexit_p(abyss_detach),
450 };
451
452 static int __init abyss_init (void)
453 {
454 abyss_netdev_ops = tms380tr_netdev_ops;
455
456 abyss_netdev_ops.ndo_open = abyss_open;
457 abyss_netdev_ops.ndo_stop = abyss_close;
458
459 return pci_register_driver(&abyss_driver);
460 }
461
462 static void __exit abyss_rmmod (void)
463 {
464 pci_unregister_driver (&abyss_driver);
465 }
466
467 module_init(abyss_init);
468 module_exit(abyss_rmmod);
469