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Commit | Line | Data |
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99c3adb4 | 1 | /* |
1da177e4 LT |
2 | Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> |
3 | ||
4 | National Semiconductor SCx200 ACCESS.bus support | |
16ffc5c9 | 5 | Also supports the AMD CS5535 and AMD CS5536 |
99c3adb4 | 6 | |
1da177e4 LT |
7 | Based on i2c-keywest.c which is: |
8 | Copyright (c) 2001 Benjamin Herrenschmidt <benh@kernel.crashing.org> | |
9 | Copyright (c) 2000 Philip Edelbrock <phil@stimpy.netroedge.com> | |
99c3adb4 | 10 | |
1da177e4 LT |
11 | This program is free software; you can redistribute it and/or |
12 | modify it under the terms of the GNU General Public License as | |
13 | published by the Free Software Foundation; either version 2 of the | |
14 | License, or (at your option) any later version. | |
99c3adb4 | 15 | |
1da177e4 LT |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | General Public License for more details. | |
99c3adb4 | 20 | |
1da177e4 LT |
21 | You should have received a copy of the GNU General Public License |
22 | along with this program; if not, write to the Free Software | |
23 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
1da177e4 LT |
24 | */ |
25 | ||
1da177e4 LT |
26 | #include <linux/module.h> |
27 | #include <linux/errno.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/init.h> | |
30 | #include <linux/i2c.h> | |
31 | #include <linux/smp_lock.h> | |
32 | #include <linux/pci.h> | |
33 | #include <linux/delay.h> | |
3fb9a655 | 34 | #include <linux/mutex.h> |
1da177e4 LT |
35 | #include <asm/io.h> |
36 | ||
37 | #include <linux/scx200.h> | |
38 | ||
39 | #define NAME "scx200_acb" | |
40 | ||
41 | MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>"); | |
42 | MODULE_DESCRIPTION("NatSemi SCx200 ACCESS.bus Driver"); | |
43 | MODULE_LICENSE("GPL"); | |
44 | ||
45 | #define MAX_DEVICES 4 | |
46 | static int base[MAX_DEVICES] = { 0x820, 0x840 }; | |
47 | module_param_array(base, int, NULL, 0); | |
48 | MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers"); | |
49 | ||
f933ff50 | 50 | #define POLL_TIMEOUT (HZ/5) |
1da177e4 LT |
51 | |
52 | enum scx200_acb_state { | |
53 | state_idle, | |
54 | state_address, | |
55 | state_command, | |
56 | state_repeat_start, | |
57 | state_quick, | |
58 | state_read, | |
59 | state_write, | |
60 | }; | |
61 | ||
62 | static const char *scx200_acb_state_name[] = { | |
63 | "idle", | |
64 | "address", | |
65 | "command", | |
66 | "repeat_start", | |
67 | "quick", | |
68 | "read", | |
69 | "write", | |
70 | }; | |
71 | ||
72 | /* Physical interface */ | |
99c3adb4 | 73 | struct scx200_acb_iface { |
1da177e4 LT |
74 | struct scx200_acb_iface *next; |
75 | struct i2c_adapter adapter; | |
76 | unsigned base; | |
3fb9a655 | 77 | struct mutex mutex; |
1da177e4 LT |
78 | |
79 | /* State machine data */ | |
80 | enum scx200_acb_state state; | |
81 | int result; | |
82 | u8 address_byte; | |
83 | u8 command; | |
84 | u8 *ptr; | |
85 | char needs_reset; | |
86 | unsigned len; | |
80cd3a87 JC |
87 | |
88 | /* PCI device info */ | |
89 | struct pci_dev *pdev; | |
90 | int bar; | |
1da177e4 LT |
91 | }; |
92 | ||
93 | /* Register Definitions */ | |
94 | #define ACBSDA (iface->base + 0) | |
95 | #define ACBST (iface->base + 1) | |
96 | #define ACBST_SDAST 0x40 /* SDA Status */ | |
99c3adb4 | 97 | #define ACBST_BER 0x20 |
1da177e4 LT |
98 | #define ACBST_NEGACK 0x10 /* Negative Acknowledge */ |
99 | #define ACBST_STASTR 0x08 /* Stall After Start */ | |
100 | #define ACBST_MASTER 0x02 | |
101 | #define ACBCST (iface->base + 2) | |
102 | #define ACBCST_BB 0x02 | |
103 | #define ACBCTL1 (iface->base + 3) | |
104 | #define ACBCTL1_STASTRE 0x80 | |
105 | #define ACBCTL1_NMINTE 0x40 | |
99c3adb4 BG |
106 | #define ACBCTL1_ACK 0x10 |
107 | #define ACBCTL1_STOP 0x02 | |
108 | #define ACBCTL1_START 0x01 | |
1da177e4 LT |
109 | #define ACBADDR (iface->base + 4) |
110 | #define ACBCTL2 (iface->base + 5) | |
111 | #define ACBCTL2_ENABLE 0x01 | |
112 | ||
113 | /************************************************************************/ | |
114 | ||
115 | static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status) | |
116 | { | |
117 | const char *errmsg; | |
118 | ||
ef4d9275 BG |
119 | dev_dbg(&iface->adapter.dev, "state %s, status = 0x%02x\n", |
120 | scx200_acb_state_name[iface->state], status); | |
1da177e4 LT |
121 | |
122 | if (status & ACBST_BER) { | |
123 | errmsg = "bus error"; | |
124 | goto error; | |
125 | } | |
126 | if (!(status & ACBST_MASTER)) { | |
127 | errmsg = "not master"; | |
128 | goto error; | |
129 | } | |
9b7b6d3b BG |
130 | if (status & ACBST_NEGACK) { |
131 | dev_dbg(&iface->adapter.dev, "negative ack in state %s\n", | |
132 | scx200_acb_state_name[iface->state]); | |
133 | ||
134 | iface->state = state_idle; | |
135 | iface->result = -ENXIO; | |
136 | ||
137 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); | |
138 | outb(ACBST_STASTR | ACBST_NEGACK, ACBST); | |
95563d34 JC |
139 | |
140 | /* Reset the status register */ | |
141 | outb(0, ACBST); | |
9b7b6d3b BG |
142 | return; |
143 | } | |
1da177e4 LT |
144 | |
145 | switch (iface->state) { | |
146 | case state_idle: | |
147 | dev_warn(&iface->adapter.dev, "interrupt in idle state\n"); | |
148 | break; | |
149 | ||
150 | case state_address: | |
151 | /* Do a pointer write first */ | |
152 | outb(iface->address_byte & ~1, ACBSDA); | |
153 | ||
154 | iface->state = state_command; | |
155 | break; | |
156 | ||
157 | case state_command: | |
158 | outb(iface->command, ACBSDA); | |
159 | ||
160 | if (iface->address_byte & 1) | |
161 | iface->state = state_repeat_start; | |
162 | else | |
163 | iface->state = state_write; | |
164 | break; | |
165 | ||
166 | case state_repeat_start: | |
167 | outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1); | |
168 | /* fallthrough */ | |
99c3adb4 | 169 | |
1da177e4 LT |
170 | case state_quick: |
171 | if (iface->address_byte & 1) { | |
99c3adb4 | 172 | if (iface->len == 1) |
1da177e4 LT |
173 | outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1); |
174 | else | |
175 | outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1); | |
176 | outb(iface->address_byte, ACBSDA); | |
177 | ||
178 | iface->state = state_read; | |
179 | } else { | |
180 | outb(iface->address_byte, ACBSDA); | |
181 | ||
182 | iface->state = state_write; | |
183 | } | |
184 | break; | |
185 | ||
186 | case state_read: | |
fd627a01 TA |
187 | /* Set ACK if _next_ byte will be the last one */ |
188 | if (iface->len == 2) | |
1da177e4 LT |
189 | outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1); |
190 | else | |
191 | outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1); | |
192 | ||
fd627a01 | 193 | if (iface->len == 1) { |
1da177e4 LT |
194 | iface->result = 0; |
195 | iface->state = state_idle; | |
196 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); | |
197 | } | |
198 | ||
fd627a01 TA |
199 | *iface->ptr++ = inb(ACBSDA); |
200 | --iface->len; | |
201 | ||
1da177e4 LT |
202 | break; |
203 | ||
204 | case state_write: | |
205 | if (iface->len == 0) { | |
206 | iface->result = 0; | |
207 | iface->state = state_idle; | |
208 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); | |
209 | break; | |
210 | } | |
99c3adb4 | 211 | |
1da177e4 LT |
212 | outb(*iface->ptr++, ACBSDA); |
213 | --iface->len; | |
99c3adb4 | 214 | |
1da177e4 LT |
215 | break; |
216 | } | |
217 | ||
218 | return; | |
219 | ||
1da177e4 LT |
220 | error: |
221 | dev_err(&iface->adapter.dev, "%s in state %s\n", errmsg, | |
222 | scx200_acb_state_name[iface->state]); | |
223 | ||
224 | iface->state = state_idle; | |
225 | iface->result = -EIO; | |
226 | iface->needs_reset = 1; | |
227 | } | |
228 | ||
1da177e4 LT |
229 | static void scx200_acb_poll(struct scx200_acb_iface *iface) |
230 | { | |
9b7b6d3b | 231 | u8 status; |
1da177e4 LT |
232 | unsigned long timeout; |
233 | ||
234 | timeout = jiffies + POLL_TIMEOUT; | |
3e3183ba | 235 | while (1) { |
1da177e4 | 236 | status = inb(ACBST); |
95563d34 JC |
237 | |
238 | /* Reset the status register to avoid the hang */ | |
239 | outb(0, ACBST); | |
240 | ||
1da177e4 LT |
241 | if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) { |
242 | scx200_acb_machine(iface, status); | |
243 | return; | |
244 | } | |
3e3183ba DW |
245 | if (time_after(jiffies, timeout)) |
246 | break; | |
247 | cpu_relax(); | |
248 | cond_resched(); | |
1da177e4 LT |
249 | } |
250 | ||
9b7b6d3b BG |
251 | dev_err(&iface->adapter.dev, "timeout in state %s\n", |
252 | scx200_acb_state_name[iface->state]); | |
253 | ||
254 | iface->state = state_idle; | |
255 | iface->result = -EIO; | |
256 | iface->needs_reset = 1; | |
1da177e4 | 257 | } |
1da177e4 LT |
258 | |
259 | static void scx200_acb_reset(struct scx200_acb_iface *iface) | |
260 | { | |
261 | /* Disable the ACCESS.bus device and Configure the SCL | |
99c3adb4 | 262 | frequency: 16 clock cycles */ |
1da177e4 LT |
263 | outb(0x70, ACBCTL2); |
264 | /* Polling mode */ | |
265 | outb(0, ACBCTL1); | |
266 | /* Disable slave address */ | |
267 | outb(0, ACBADDR); | |
268 | /* Enable the ACCESS.bus device */ | |
269 | outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2); | |
270 | /* Free STALL after START */ | |
271 | outb(inb(ACBCTL1) & ~(ACBCTL1_STASTRE | ACBCTL1_NMINTE), ACBCTL1); | |
272 | /* Send a STOP */ | |
273 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); | |
274 | /* Clear BER, NEGACK and STASTR bits */ | |
275 | outb(ACBST_BER | ACBST_NEGACK | ACBST_STASTR, ACBST); | |
276 | /* Clear BB bit */ | |
277 | outb(inb(ACBCST) | ACBCST_BB, ACBCST); | |
278 | } | |
279 | ||
280 | static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter, | |
99c3adb4 BG |
281 | u16 address, unsigned short flags, |
282 | char rw, u8 command, int size, | |
283 | union i2c_smbus_data *data) | |
1da177e4 LT |
284 | { |
285 | struct scx200_acb_iface *iface = i2c_get_adapdata(adapter); | |
286 | int len; | |
287 | u8 *buffer; | |
288 | u16 cur_word; | |
289 | int rc; | |
290 | ||
291 | switch (size) { | |
292 | case I2C_SMBUS_QUICK: | |
99c3adb4 BG |
293 | len = 0; |
294 | buffer = NULL; | |
295 | break; | |
296 | ||
1da177e4 | 297 | case I2C_SMBUS_BYTE: |
9b7b6d3b BG |
298 | len = 1; |
299 | buffer = rw ? &data->byte : &command; | |
99c3adb4 BG |
300 | break; |
301 | ||
1da177e4 | 302 | case I2C_SMBUS_BYTE_DATA: |
99c3adb4 BG |
303 | len = 1; |
304 | buffer = &data->byte; | |
305 | break; | |
306 | ||
1da177e4 LT |
307 | case I2C_SMBUS_WORD_DATA: |
308 | len = 2; | |
99c3adb4 BG |
309 | cur_word = cpu_to_le16(data->word); |
310 | buffer = (u8 *)&cur_word; | |
1da177e4 | 311 | break; |
99c3adb4 | 312 | |
c3efacaa JD |
313 | case I2C_SMBUS_I2C_BLOCK_DATA: |
314 | if (rw == I2C_SMBUS_READ) | |
315 | data->block[0] = I2C_SMBUS_BLOCK_MAX; /* For now */ | |
99c3adb4 | 316 | len = data->block[0]; |
c3efacaa JD |
317 | if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) |
318 | return -EINVAL; | |
99c3adb4 | 319 | buffer = &data->block[1]; |
1da177e4 | 320 | break; |
99c3adb4 | 321 | |
1da177e4 | 322 | default: |
99c3adb4 | 323 | return -EINVAL; |
1da177e4 LT |
324 | } |
325 | ||
ef4d9275 BG |
326 | dev_dbg(&adapter->dev, |
327 | "size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n", | |
328 | size, address, command, len, rw); | |
1da177e4 LT |
329 | |
330 | if (!len && rw == I2C_SMBUS_READ) { | |
ef4d9275 | 331 | dev_dbg(&adapter->dev, "zero length read\n"); |
1da177e4 LT |
332 | return -EINVAL; |
333 | } | |
334 | ||
3fb9a655 | 335 | mutex_lock(&iface->mutex); |
1da177e4 | 336 | |
9b7b6d3b | 337 | iface->address_byte = (address << 1) | rw; |
1da177e4 LT |
338 | iface->command = command; |
339 | iface->ptr = buffer; | |
340 | iface->len = len; | |
341 | iface->result = -EINVAL; | |
342 | iface->needs_reset = 0; | |
343 | ||
344 | outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1); | |
345 | ||
346 | if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) | |
347 | iface->state = state_quick; | |
348 | else | |
349 | iface->state = state_address; | |
350 | ||
1da177e4 LT |
351 | while (iface->state != state_idle) |
352 | scx200_acb_poll(iface); | |
1da177e4 LT |
353 | |
354 | if (iface->needs_reset) | |
355 | scx200_acb_reset(iface); | |
356 | ||
357 | rc = iface->result; | |
358 | ||
3fb9a655 | 359 | mutex_unlock(&iface->mutex); |
1da177e4 LT |
360 | |
361 | if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ) | |
99c3adb4 | 362 | data->word = le16_to_cpu(cur_word); |
1da177e4 LT |
363 | |
364 | #ifdef DEBUG | |
ef4d9275 | 365 | dev_dbg(&adapter->dev, "transfer done, result: %d", rc); |
1da177e4 LT |
366 | if (buffer) { |
367 | int i; | |
368 | printk(" data:"); | |
369 | for (i = 0; i < len; ++i) | |
370 | printk(" %02x", buffer[i]); | |
371 | } | |
372 | printk("\n"); | |
373 | #endif | |
374 | ||
375 | return rc; | |
376 | } | |
377 | ||
378 | static u32 scx200_acb_func(struct i2c_adapter *adapter) | |
379 | { | |
380 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | | |
381 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | | |
c3efacaa | 382 | I2C_FUNC_SMBUS_I2C_BLOCK; |
1da177e4 LT |
383 | } |
384 | ||
385 | /* For now, we only handle combined mode (smbus) */ | |
8f9082c5 | 386 | static const struct i2c_algorithm scx200_acb_algorithm = { |
1da177e4 LT |
387 | .smbus_xfer = scx200_acb_smbus_xfer, |
388 | .functionality = scx200_acb_func, | |
389 | }; | |
390 | ||
391 | static struct scx200_acb_iface *scx200_acb_list; | |
8a05940d | 392 | static DECLARE_MUTEX(scx200_acb_list_mutex); |
1da177e4 | 393 | |
99173926 | 394 | static __init int scx200_acb_probe(struct scx200_acb_iface *iface) |
1da177e4 LT |
395 | { |
396 | u8 val; | |
397 | ||
398 | /* Disable the ACCESS.bus device and Configure the SCL | |
99c3adb4 | 399 | frequency: 16 clock cycles */ |
1da177e4 LT |
400 | outb(0x70, ACBCTL2); |
401 | ||
402 | if (inb(ACBCTL2) != 0x70) { | |
ef4d9275 | 403 | pr_debug(NAME ": ACBCTL2 readback failed\n"); |
1da177e4 LT |
404 | return -ENXIO; |
405 | } | |
406 | ||
407 | outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1); | |
408 | ||
409 | val = inb(ACBCTL1); | |
410 | if (val) { | |
ef4d9275 BG |
411 | pr_debug(NAME ": disabled, but ACBCTL1=0x%02x\n", |
412 | val); | |
1da177e4 LT |
413 | return -ENXIO; |
414 | } | |
415 | ||
416 | outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2); | |
417 | ||
418 | outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1); | |
419 | ||
420 | val = inb(ACBCTL1); | |
421 | if ((val & ACBCTL1_NMINTE) != ACBCTL1_NMINTE) { | |
ef4d9275 BG |
422 | pr_debug(NAME ": enabled, but NMINTE won't be set, " |
423 | "ACBCTL1=0x%02x\n", val); | |
1da177e4 LT |
424 | return -ENXIO; |
425 | } | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
80cd3a87 | 430 | static __init struct scx200_acb_iface *scx200_create_iface(const char *text, |
12a917f6 | 431 | struct device *dev, int index) |
1da177e4 LT |
432 | { |
433 | struct scx200_acb_iface *iface; | |
434 | struct i2c_adapter *adapter; | |
1da177e4 | 435 | |
5263ebb5 | 436 | iface = kzalloc(sizeof(*iface), GFP_KERNEL); |
1da177e4 LT |
437 | if (!iface) { |
438 | printk(KERN_ERR NAME ": can't allocate memory\n"); | |
80cd3a87 | 439 | return NULL; |
1da177e4 LT |
440 | } |
441 | ||
1da177e4 LT |
442 | adapter = &iface->adapter; |
443 | i2c_set_adapdata(adapter, iface); | |
16ffc5c9 | 444 | snprintf(adapter->name, I2C_NAME_SIZE, "%s ACB%d", text, index); |
1da177e4 | 445 | adapter->owner = THIS_MODULE; |
1684a984 | 446 | adapter->id = I2C_HW_SMBUS_SCX200; |
1da177e4 LT |
447 | adapter->algo = &scx200_acb_algorithm; |
448 | adapter->class = I2C_CLASS_HWMON; | |
12a917f6 | 449 | adapter->dev.parent = dev; |
1da177e4 | 450 | |
3fb9a655 | 451 | mutex_init(&iface->mutex); |
1da177e4 | 452 | |
80cd3a87 JC |
453 | return iface; |
454 | } | |
455 | ||
456 | static int __init scx200_acb_create(struct scx200_acb_iface *iface) | |
457 | { | |
458 | struct i2c_adapter *adapter; | |
459 | int rc; | |
460 | ||
461 | adapter = &iface->adapter; | |
1da177e4 LT |
462 | |
463 | rc = scx200_acb_probe(iface); | |
464 | if (rc) { | |
ef4d9275 | 465 | printk(KERN_WARNING NAME ": probe failed\n"); |
80cd3a87 | 466 | return rc; |
1da177e4 LT |
467 | } |
468 | ||
469 | scx200_acb_reset(iface); | |
470 | ||
471 | if (i2c_add_adapter(adapter) < 0) { | |
ef4d9275 | 472 | printk(KERN_ERR NAME ": failed to register\n"); |
80cd3a87 | 473 | return -ENODEV; |
1da177e4 LT |
474 | } |
475 | ||
8a05940d | 476 | down(&scx200_acb_list_mutex); |
1da177e4 LT |
477 | iface->next = scx200_acb_list; |
478 | scx200_acb_list = iface; | |
8a05940d | 479 | up(&scx200_acb_list_mutex); |
1da177e4 LT |
480 | |
481 | return 0; | |
80cd3a87 | 482 | } |
1da177e4 | 483 | |
80cd3a87 JC |
484 | static __init int scx200_create_pci(const char *text, struct pci_dev *pdev, |
485 | int bar) | |
486 | { | |
487 | struct scx200_acb_iface *iface; | |
488 | int rc; | |
489 | ||
12a917f6 | 490 | iface = scx200_create_iface(text, &pdev->dev, 0); |
80cd3a87 JC |
491 | |
492 | if (iface == NULL) | |
493 | return -ENOMEM; | |
494 | ||
495 | iface->pdev = pdev; | |
496 | iface->bar = bar; | |
497 | ||
ffb3d134 JG |
498 | rc = pci_enable_device_bars(iface->pdev, 1 << iface->bar); |
499 | if (rc) | |
500 | goto errout_free; | |
80cd3a87 JC |
501 | |
502 | rc = pci_request_region(iface->pdev, iface->bar, iface->adapter.name); | |
ffb3d134 | 503 | if (rc) { |
80cd3a87 JC |
504 | printk(KERN_ERR NAME ": can't allocate PCI BAR %d\n", |
505 | iface->bar); | |
506 | goto errout_free; | |
507 | } | |
508 | ||
509 | iface->base = pci_resource_start(iface->pdev, iface->bar); | |
510 | rc = scx200_acb_create(iface); | |
511 | ||
512 | if (rc == 0) | |
513 | return 0; | |
514 | ||
515 | pci_release_region(iface->pdev, iface->bar); | |
516 | pci_dev_put(iface->pdev); | |
9b7b6d3b BG |
517 | errout_free: |
518 | kfree(iface); | |
1da177e4 LT |
519 | return rc; |
520 | } | |
521 | ||
80cd3a87 JC |
522 | static int __init scx200_create_isa(const char *text, unsigned long base, |
523 | int index) | |
524 | { | |
525 | struct scx200_acb_iface *iface; | |
526 | int rc; | |
527 | ||
12a917f6 | 528 | iface = scx200_create_iface(text, NULL, index); |
80cd3a87 JC |
529 | |
530 | if (iface == NULL) | |
531 | return -ENOMEM; | |
532 | ||
533 | if (request_region(base, 8, iface->adapter.name) == 0) { | |
534 | printk(KERN_ERR NAME ": can't allocate io 0x%lx-0x%lx\n", | |
535 | base, base + 8 - 1); | |
536 | rc = -EBUSY; | |
537 | goto errout_free; | |
538 | } | |
539 | ||
540 | iface->base = base; | |
541 | rc = scx200_acb_create(iface); | |
542 | ||
543 | if (rc == 0) | |
544 | return 0; | |
1da177e4 | 545 | |
80cd3a87 JC |
546 | release_region(base, 8); |
547 | errout_free: | |
548 | kfree(iface); | |
549 | return rc; | |
550 | } | |
551 | ||
552 | /* Driver data is an index into the scx200_data array that indicates | |
553 | * the name and the BAR where the I/O address resource is located. ISA | |
554 | * devices are flagged with a bar value of -1 */ | |
555 | ||
556 | static struct pci_device_id scx200_pci[] = { | |
557 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE), | |
558 | .driver_data = 0 }, | |
559 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE), | |
560 | .driver_data = 0 }, | |
561 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA), | |
562 | .driver_data = 1 }, | |
563 | { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA), | |
564 | .driver_data = 2 } | |
16ffc5c9 BG |
565 | }; |
566 | ||
80cd3a87 JC |
567 | static struct { |
568 | const char *name; | |
569 | int bar; | |
570 | } scx200_data[] = { | |
571 | { "SCx200", -1 }, | |
572 | { "CS5535", 0 }, | |
573 | { "CS5536", 0 } | |
574 | }; | |
16ffc5c9 | 575 | |
80cd3a87 | 576 | static __init int scx200_scan_pci(void) |
16ffc5c9 | 577 | { |
80cd3a87 JC |
578 | int data, dev; |
579 | int rc = -ENODEV; | |
580 | struct pci_dev *pdev; | |
581 | ||
582 | for(dev = 0; dev < ARRAY_SIZE(scx200_pci); dev++) { | |
583 | pdev = pci_get_device(scx200_pci[dev].vendor, | |
584 | scx200_pci[dev].device, NULL); | |
585 | ||
586 | if (pdev == NULL) | |
587 | continue; | |
588 | ||
589 | data = scx200_pci[dev].driver_data; | |
590 | ||
591 | /* if .bar is greater or equal to zero, this is a | |
592 | * PCI device - otherwise, we assume | |
593 | that the ports are ISA based | |
594 | */ | |
595 | ||
596 | if (scx200_data[data].bar >= 0) | |
597 | rc = scx200_create_pci(scx200_data[data].name, pdev, | |
598 | scx200_data[data].bar); | |
599 | else { | |
600 | int i; | |
601 | ||
602 | for (i = 0; i < MAX_DEVICES; ++i) { | |
603 | if (base[i] == 0) | |
604 | continue; | |
605 | ||
606 | rc = scx200_create_isa(scx200_data[data].name, | |
607 | base[i], | |
608 | i); | |
609 | } | |
610 | } | |
16ffc5c9 | 611 | |
80cd3a87 | 612 | break; |
16ffc5c9 BG |
613 | } |
614 | ||
80cd3a87 | 615 | return rc; |
16ffc5c9 BG |
616 | } |
617 | ||
1da177e4 LT |
618 | static int __init scx200_acb_init(void) |
619 | { | |
80cd3a87 | 620 | int rc; |
1da177e4 LT |
621 | |
622 | pr_debug(NAME ": NatSemi SCx200 ACCESS.bus Driver\n"); | |
623 | ||
80cd3a87 | 624 | rc = scx200_scan_pci(); |
1da177e4 | 625 | |
6f9c2963 JD |
626 | /* If at least one bus was created, init must succeed */ |
627 | if (scx200_acb_list) | |
628 | return 0; | |
1da177e4 LT |
629 | return rc; |
630 | } | |
631 | ||
632 | static void __exit scx200_acb_cleanup(void) | |
633 | { | |
634 | struct scx200_acb_iface *iface; | |
99c3adb4 | 635 | |
8a05940d | 636 | down(&scx200_acb_list_mutex); |
1da177e4 LT |
637 | while ((iface = scx200_acb_list) != NULL) { |
638 | scx200_acb_list = iface->next; | |
8a05940d | 639 | up(&scx200_acb_list_mutex); |
1da177e4 LT |
640 | |
641 | i2c_del_adapter(&iface->adapter); | |
80cd3a87 JC |
642 | |
643 | if (iface->pdev) { | |
644 | pci_release_region(iface->pdev, iface->bar); | |
645 | pci_dev_put(iface->pdev); | |
646 | } | |
647 | else | |
648 | release_region(iface->base, 8); | |
649 | ||
1da177e4 | 650 | kfree(iface); |
8a05940d | 651 | down(&scx200_acb_list_mutex); |
1da177e4 | 652 | } |
8a05940d | 653 | up(&scx200_acb_list_mutex); |
1da177e4 LT |
654 | } |
655 | ||
656 | module_init(scx200_acb_init); | |
657 | module_exit(scx200_acb_cleanup); |