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bb9f8692 ZY |
1 | /* |
2 | * Intel Wireless Multicomm 3200 WiFi driver | |
3 | * | |
4 | * Copyright (C) 2009 Intel Corporation. All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * | |
10 | * * Redistributions of source code must retain the above copyright | |
11 | * notice, this list of conditions and the following disclaimer. | |
12 | * * Redistributions in binary form must reproduce the above copyright | |
13 | * notice, this list of conditions and the following disclaimer in | |
14 | * the documentation and/or other materials provided with the | |
15 | * distribution. | |
16 | * * Neither the name of Intel Corporation nor the names of its | |
17 | * contributors may be used to endorse or promote products derived | |
18 | * from this software without specific prior written permission. | |
19 | * | |
20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
31 | * | |
32 | * | |
33 | * Intel Corporation <ilw@linux.intel.com> | |
34 | * Samuel Ortiz <samuel.ortiz@intel.com> | |
35 | * Zhu Yi <yi.zhu@intel.com> | |
36 | * | |
37 | */ | |
38 | ||
39 | /* | |
40 | * This is the SDIO bus specific hooks for iwm. | |
41 | * It also is the module's entry point. | |
42 | * | |
43 | * Interesting code paths: | |
44 | * iwm_sdio_probe() (Called by an SDIO bus scan) | |
45 | * -> iwm_if_alloc() (netdev.c) | |
46 | * -> iwm_wdev_alloc() (cfg80211.c, allocates and register our wiphy) | |
47 | * -> wiphy_new() | |
48 | * -> wiphy_register() | |
49 | * -> alloc_netdev_mq() | |
50 | * -> register_netdev() | |
51 | * | |
52 | * iwm_sdio_remove() | |
53 | * -> iwm_if_free() (netdev.c) | |
54 | * -> unregister_netdev() | |
55 | * -> iwm_wdev_free() (cfg80211.c) | |
56 | * -> wiphy_unregister() | |
57 | * -> wiphy_free() | |
58 | * | |
59 | * iwm_sdio_isr() (called in process context from the SDIO core code) | |
60 | * -> queue_work(.., isr_worker) | |
61 | * -- [async] --> iwm_sdio_isr_worker() | |
62 | * -> iwm_rx_handle() | |
63 | */ | |
64 | ||
65 | #include <linux/kernel.h> | |
66 | #include <linux/netdevice.h> | |
67 | #include <linux/debugfs.h> | |
68 | #include <linux/mmc/sdio.h> | |
69 | #include <linux/mmc/sdio_func.h> | |
70 | ||
71 | #include "iwm.h" | |
72 | #include "debug.h" | |
73 | #include "bus.h" | |
74 | #include "sdio.h" | |
75 | ||
76 | static void iwm_sdio_isr_worker(struct work_struct *work) | |
77 | { | |
78 | struct iwm_sdio_priv *hw; | |
79 | struct iwm_priv *iwm; | |
80 | struct iwm_rx_info *rx_info; | |
81 | struct sk_buff *skb; | |
82 | u8 *rx_buf; | |
83 | unsigned long rx_size; | |
84 | ||
85 | hw = container_of(work, struct iwm_sdio_priv, isr_worker); | |
86 | iwm = hw_to_iwm(hw); | |
87 | ||
88 | while (!skb_queue_empty(&iwm->rx_list)) { | |
89 | skb = skb_dequeue(&iwm->rx_list); | |
90 | rx_info = skb_to_rx_info(skb); | |
91 | rx_size = rx_info->rx_size; | |
92 | rx_buf = skb->data; | |
93 | ||
94 | IWM_HEXDUMP(iwm, DBG, SDIO, "RX: ", rx_buf, rx_size); | |
95 | if (iwm_rx_handle(iwm, rx_buf, rx_size) < 0) | |
96 | IWM_WARN(iwm, "RX error\n"); | |
97 | ||
98 | kfree_skb(skb); | |
99 | } | |
100 | } | |
101 | ||
102 | static void iwm_sdio_isr(struct sdio_func *func) | |
103 | { | |
104 | struct iwm_priv *iwm; | |
105 | struct iwm_sdio_priv *hw; | |
106 | struct iwm_rx_info *rx_info; | |
107 | struct sk_buff *skb; | |
108 | unsigned long buf_size, read_size; | |
109 | int ret; | |
110 | u8 val; | |
111 | ||
112 | hw = sdio_get_drvdata(func); | |
113 | iwm = hw_to_iwm(hw); | |
114 | ||
115 | buf_size = hw->blk_size; | |
116 | ||
117 | /* We're checking the status */ | |
118 | val = sdio_readb(func, IWM_SDIO_INTR_STATUS_ADDR, &ret); | |
119 | if (val == 0 || ret < 0) { | |
120 | IWM_ERR(iwm, "Wrong INTR_STATUS\n"); | |
121 | return; | |
122 | } | |
123 | ||
124 | /* See if we have free buffers */ | |
125 | if (skb_queue_len(&iwm->rx_list) > IWM_RX_LIST_SIZE) { | |
126 | IWM_ERR(iwm, "No buffer for more Rx frames\n"); | |
127 | return; | |
128 | } | |
129 | ||
130 | /* We first read the transaction size */ | |
131 | read_size = sdio_readb(func, IWM_SDIO_INTR_GET_SIZE_ADDR + 1, &ret); | |
132 | read_size = read_size << 8; | |
133 | ||
134 | if (ret < 0) { | |
135 | IWM_ERR(iwm, "Couldn't read the xfer size\n"); | |
136 | return; | |
137 | } | |
138 | ||
139 | /* We need to clear the INT register */ | |
140 | sdio_writeb(func, 1, IWM_SDIO_INTR_CLEAR_ADDR, &ret); | |
141 | if (ret < 0) { | |
142 | IWM_ERR(iwm, "Couldn't clear the INT register\n"); | |
143 | return; | |
144 | } | |
145 | ||
146 | while (buf_size < read_size) | |
147 | buf_size <<= 1; | |
148 | ||
149 | skb = dev_alloc_skb(buf_size); | |
150 | if (!skb) { | |
151 | IWM_ERR(iwm, "Couldn't alloc RX skb\n"); | |
152 | return; | |
153 | } | |
154 | rx_info = skb_to_rx_info(skb); | |
155 | rx_info->rx_size = read_size; | |
156 | rx_info->rx_buf_size = buf_size; | |
157 | ||
158 | /* Now we can read the actual buffer */ | |
159 | ret = sdio_memcpy_fromio(func, skb_put(skb, read_size), | |
160 | IWM_SDIO_DATA_ADDR, read_size); | |
161 | ||
162 | /* The skb is put on a driver's specific Rx SKB list */ | |
163 | skb_queue_tail(&iwm->rx_list, skb); | |
164 | ||
165 | /* We can now schedule the actual worker */ | |
166 | queue_work(hw->isr_wq, &hw->isr_worker); | |
167 | } | |
168 | ||
169 | static void iwm_sdio_rx_free(struct iwm_sdio_priv *hw) | |
170 | { | |
171 | struct iwm_priv *iwm = hw_to_iwm(hw); | |
172 | ||
173 | flush_workqueue(hw->isr_wq); | |
174 | ||
175 | skb_queue_purge(&iwm->rx_list); | |
176 | } | |
177 | ||
178 | /* Bus ops */ | |
179 | static int if_sdio_enable(struct iwm_priv *iwm) | |
180 | { | |
181 | struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm); | |
182 | int ret; | |
183 | ||
184 | sdio_claim_host(hw->func); | |
185 | ||
186 | ret = sdio_enable_func(hw->func); | |
187 | if (ret) { | |
188 | IWM_ERR(iwm, "Couldn't enable the device: is TOP driver " | |
189 | "loaded and functional?\n"); | |
190 | goto release_host; | |
191 | } | |
192 | ||
193 | iwm_reset(iwm); | |
194 | ||
195 | ret = sdio_claim_irq(hw->func, iwm_sdio_isr); | |
196 | if (ret) { | |
197 | IWM_ERR(iwm, "Failed to claim irq: %d\n", ret); | |
198 | goto release_host; | |
199 | } | |
200 | ||
201 | sdio_writeb(hw->func, 1, IWM_SDIO_INTR_ENABLE_ADDR, &ret); | |
202 | if (ret < 0) { | |
203 | IWM_ERR(iwm, "Couldn't enable INTR: %d\n", ret); | |
204 | goto release_irq; | |
205 | } | |
206 | ||
207 | sdio_release_host(hw->func); | |
208 | ||
209 | IWM_DBG_SDIO(iwm, INFO, "IWM SDIO enable\n"); | |
210 | ||
211 | return 0; | |
212 | ||
213 | release_irq: | |
214 | sdio_release_irq(hw->func); | |
215 | release_host: | |
216 | sdio_release_host(hw->func); | |
217 | ||
218 | return ret; | |
219 | } | |
220 | ||
221 | static int if_sdio_disable(struct iwm_priv *iwm) | |
222 | { | |
223 | struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm); | |
224 | int ret; | |
225 | ||
226 | iwm_reset(iwm); | |
227 | ||
228 | sdio_claim_host(hw->func); | |
229 | sdio_writeb(hw->func, 0, IWM_SDIO_INTR_ENABLE_ADDR, &ret); | |
230 | if (ret < 0) | |
231 | IWM_WARN(iwm, "Couldn't disable INTR: %d\n", ret); | |
232 | ||
233 | sdio_release_irq(hw->func); | |
234 | sdio_disable_func(hw->func); | |
235 | sdio_release_host(hw->func); | |
236 | ||
237 | iwm_sdio_rx_free(hw); | |
238 | ||
239 | IWM_DBG_SDIO(iwm, INFO, "IWM SDIO disable\n"); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int if_sdio_send_chunk(struct iwm_priv *iwm, u8 *buf, int count) | |
245 | { | |
246 | struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm); | |
247 | int aligned_count = ALIGN(count, hw->blk_size); | |
248 | int ret; | |
249 | ||
250 | if ((unsigned long)buf & 0x3) { | |
251 | IWM_ERR(iwm, "buf <%p> is not dword aligned\n", buf); | |
252 | /* TODO: Is this a hardware limitation? use get_unligned */ | |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | sdio_claim_host(hw->func); | |
257 | ret = sdio_memcpy_toio(hw->func, IWM_SDIO_DATA_ADDR, buf, | |
258 | aligned_count); | |
259 | sdio_release_host(hw->func); | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
264 | /* debugfs hooks */ | |
265 | static int iwm_debugfs_sdio_open(struct inode *inode, struct file *filp) | |
266 | { | |
267 | filp->private_data = inode->i_private; | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static ssize_t iwm_debugfs_sdio_read(struct file *filp, char __user *buffer, | |
272 | size_t count, loff_t *ppos) | |
273 | { | |
274 | struct iwm_priv *iwm = filp->private_data; | |
275 | struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm); | |
276 | char *buf; | |
277 | u8 cccr; | |
278 | int buf_len = 4096, ret; | |
279 | size_t len = 0; | |
280 | ||
281 | if (*ppos != 0) | |
282 | return 0; | |
283 | if (count < sizeof(buf)) | |
284 | return -ENOSPC; | |
285 | ||
286 | buf = kzalloc(buf_len, GFP_KERNEL); | |
287 | if (!buf) | |
288 | return -ENOMEM; | |
289 | ||
290 | sdio_claim_host(hw->func); | |
291 | ||
292 | cccr = sdio_f0_readb(hw->func, SDIO_CCCR_IOEx, &ret); | |
293 | if (ret) { | |
294 | IWM_ERR(iwm, "Could not read SDIO_CCCR_IOEx\n"); | |
295 | goto err; | |
296 | } | |
297 | len += snprintf(buf + len, buf_len - len, "CCCR_IOEx: 0x%x\n", cccr); | |
298 | ||
299 | cccr = sdio_f0_readb(hw->func, SDIO_CCCR_IORx, &ret); | |
300 | if (ret) { | |
301 | IWM_ERR(iwm, "Could not read SDIO_CCCR_IORx\n"); | |
302 | goto err; | |
303 | } | |
304 | len += snprintf(buf + len, buf_len - len, "CCCR_IORx: 0x%x\n", cccr); | |
305 | ||
306 | ||
307 | cccr = sdio_f0_readb(hw->func, SDIO_CCCR_IENx, &ret); | |
308 | if (ret) { | |
309 | IWM_ERR(iwm, "Could not read SDIO_CCCR_IENx\n"); | |
310 | goto err; | |
311 | } | |
312 | len += snprintf(buf + len, buf_len - len, "CCCR_IENx: 0x%x\n", cccr); | |
313 | ||
314 | ||
315 | cccr = sdio_f0_readb(hw->func, SDIO_CCCR_INTx, &ret); | |
316 | if (ret) { | |
317 | IWM_ERR(iwm, "Could not read SDIO_CCCR_INTx\n"); | |
318 | goto err; | |
319 | } | |
320 | len += snprintf(buf + len, buf_len - len, "CCCR_INTx: 0x%x\n", cccr); | |
321 | ||
322 | ||
323 | cccr = sdio_f0_readb(hw->func, SDIO_CCCR_ABORT, &ret); | |
324 | if (ret) { | |
325 | IWM_ERR(iwm, "Could not read SDIO_CCCR_ABORTx\n"); | |
326 | goto err; | |
327 | } | |
328 | len += snprintf(buf + len, buf_len - len, "CCCR_ABORT: 0x%x\n", cccr); | |
329 | ||
330 | cccr = sdio_f0_readb(hw->func, SDIO_CCCR_IF, &ret); | |
331 | if (ret) { | |
332 | IWM_ERR(iwm, "Could not read SDIO_CCCR_IF\n"); | |
333 | goto err; | |
334 | } | |
335 | len += snprintf(buf + len, buf_len - len, "CCCR_IF: 0x%x\n", cccr); | |
336 | ||
337 | ||
338 | cccr = sdio_f0_readb(hw->func, SDIO_CCCR_CAPS, &ret); | |
339 | if (ret) { | |
340 | IWM_ERR(iwm, "Could not read SDIO_CCCR_CAPS\n"); | |
341 | goto err; | |
342 | } | |
343 | len += snprintf(buf + len, buf_len - len, "CCCR_CAPS: 0x%x\n", cccr); | |
344 | ||
345 | cccr = sdio_f0_readb(hw->func, SDIO_CCCR_CIS, &ret); | |
346 | if (ret) { | |
347 | IWM_ERR(iwm, "Could not read SDIO_CCCR_CIS\n"); | |
348 | goto err; | |
349 | } | |
350 | len += snprintf(buf + len, buf_len - len, "CCCR_CIS: 0x%x\n", cccr); | |
351 | ||
352 | ret = simple_read_from_buffer(buffer, len, ppos, buf, buf_len); | |
353 | err: | |
354 | sdio_release_host(hw->func); | |
355 | ||
356 | kfree(buf); | |
357 | ||
358 | return ret; | |
359 | } | |
360 | ||
361 | static const struct file_operations iwm_debugfs_sdio_fops = { | |
362 | .owner = THIS_MODULE, | |
363 | .open = iwm_debugfs_sdio_open, | |
364 | .read = iwm_debugfs_sdio_read, | |
365 | }; | |
366 | ||
367 | static int if_sdio_debugfs_init(struct iwm_priv *iwm, struct dentry *parent_dir) | |
368 | { | |
369 | int result; | |
370 | struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm); | |
371 | ||
372 | hw->cccr_dentry = debugfs_create_file("cccr", 0200, | |
373 | parent_dir, iwm, | |
374 | &iwm_debugfs_sdio_fops); | |
375 | result = PTR_ERR(hw->cccr_dentry); | |
376 | if (IS_ERR(hw->cccr_dentry) && (result != -ENODEV)) { | |
377 | IWM_ERR(iwm, "Couldn't create CCCR entry: %d\n", result); | |
378 | return result; | |
379 | } | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | static void if_sdio_debugfs_exit(struct iwm_priv *iwm) | |
385 | { | |
386 | struct iwm_sdio_priv *hw = iwm_to_if_sdio(iwm); | |
387 | ||
388 | debugfs_remove(hw->cccr_dentry); | |
389 | } | |
390 | ||
391 | static struct iwm_if_ops if_sdio_ops = { | |
392 | .enable = if_sdio_enable, | |
393 | .disable = if_sdio_disable, | |
394 | .send_chunk = if_sdio_send_chunk, | |
395 | .debugfs_init = if_sdio_debugfs_init, | |
396 | .debugfs_exit = if_sdio_debugfs_exit, | |
397 | .umac_name = "iwmc3200wifi-umac-sdio.bin", | |
398 | .calib_lmac_name = "iwmc3200wifi-lmac-calib-sdio.bin", | |
399 | .lmac_name = "iwmc3200wifi-lmac-sdio.bin", | |
400 | }; | |
401 | ||
402 | static int iwm_sdio_probe(struct sdio_func *func, | |
403 | const struct sdio_device_id *id) | |
404 | { | |
405 | struct iwm_priv *iwm; | |
406 | struct iwm_sdio_priv *hw; | |
407 | struct device *dev = &func->dev; | |
408 | int ret; | |
409 | ||
410 | /* check if TOP has already initialized the card */ | |
411 | sdio_claim_host(func); | |
412 | ret = sdio_enable_func(func); | |
413 | if (ret) { | |
414 | dev_err(dev, "wait for TOP to enable the device\n"); | |
415 | sdio_release_host(func); | |
416 | return ret; | |
417 | } | |
418 | ||
419 | ret = sdio_set_block_size(func, IWM_SDIO_BLK_SIZE); | |
420 | ||
421 | sdio_disable_func(func); | |
422 | sdio_release_host(func); | |
423 | ||
424 | if (ret < 0) { | |
425 | dev_err(dev, "Failed to set block size: %d\n", ret); | |
426 | return ret; | |
427 | } | |
428 | ||
429 | iwm = iwm_if_alloc(sizeof(struct iwm_sdio_priv), dev, &if_sdio_ops); | |
430 | if (IS_ERR(iwm)) { | |
431 | dev_err(dev, "allocate SDIO interface failed\n"); | |
432 | return PTR_ERR(iwm); | |
433 | } | |
434 | ||
435 | hw = iwm_private(iwm); | |
436 | hw->iwm = iwm; | |
437 | ||
438 | ret = iwm_debugfs_init(iwm); | |
439 | if (ret < 0) { | |
440 | IWM_ERR(iwm, "Debugfs registration failed\n"); | |
441 | goto if_free; | |
442 | } | |
443 | ||
444 | sdio_set_drvdata(func, hw); | |
445 | ||
446 | hw->func = func; | |
447 | hw->blk_size = IWM_SDIO_BLK_SIZE; | |
448 | ||
449 | hw->isr_wq = create_singlethread_workqueue(KBUILD_MODNAME "_sdio"); | |
450 | if (!hw->isr_wq) { | |
451 | ret = -ENOMEM; | |
452 | goto debugfs_exit; | |
453 | } | |
454 | ||
455 | INIT_WORK(&hw->isr_worker, iwm_sdio_isr_worker); | |
456 | ||
457 | dev_info(dev, "IWM SDIO probe\n"); | |
458 | ||
459 | return 0; | |
460 | ||
461 | debugfs_exit: | |
462 | iwm_debugfs_exit(iwm); | |
463 | if_free: | |
464 | iwm_if_free(iwm); | |
465 | return ret; | |
466 | } | |
467 | ||
468 | static void iwm_sdio_remove(struct sdio_func *func) | |
469 | { | |
470 | struct iwm_sdio_priv *hw = sdio_get_drvdata(func); | |
471 | struct iwm_priv *iwm = hw_to_iwm(hw); | |
472 | struct device *dev = &func->dev; | |
473 | ||
474 | iwm_debugfs_exit(iwm); | |
475 | iwm_if_free(iwm); | |
476 | destroy_workqueue(hw->isr_wq); | |
477 | ||
478 | sdio_set_drvdata(func, NULL); | |
479 | ||
480 | dev_info(dev, "IWM SDIO remove\n"); | |
481 | ||
482 | return; | |
483 | } | |
484 | ||
485 | static const struct sdio_device_id iwm_sdio_ids[] = { | |
486 | { SDIO_DEVICE(SDIO_VENDOR_ID_INTEL, SDIO_DEVICE_ID_IWM) }, | |
487 | { /* end: all zeroes */ }, | |
488 | }; | |
489 | MODULE_DEVICE_TABLE(sdio, iwm_sdio_ids); | |
490 | ||
491 | static struct sdio_driver iwm_sdio_driver = { | |
492 | .name = "iwm_sdio", | |
493 | .id_table = iwm_sdio_ids, | |
494 | .probe = iwm_sdio_probe, | |
495 | .remove = iwm_sdio_remove, | |
496 | }; | |
497 | ||
498 | static int __init iwm_sdio_init_module(void) | |
499 | { | |
500 | int ret; | |
501 | ||
502 | ret = sdio_register_driver(&iwm_sdio_driver); | |
503 | ||
504 | return ret; | |
505 | } | |
506 | ||
507 | static void __exit iwm_sdio_exit_module(void) | |
508 | { | |
509 | sdio_unregister_driver(&iwm_sdio_driver); | |
510 | } | |
511 | ||
512 | module_init(iwm_sdio_init_module); | |
513 | module_exit(iwm_sdio_exit_module); | |
514 | ||
515 | MODULE_LICENSE("GPL"); | |
516 | MODULE_AUTHOR(IWM_COPYRIGHT " " IWM_AUTHOR); |