Commit | Line | Data |
---|---|---|
40d69043 DT |
1 | /* |
2 | * Copyright (C) ST-Ericsson AB 2010 | |
3 | * Contact: Sjur Brendeland / sjur.brandeland@stericsson.com | |
4 | * Author: Daniel Martensson / daniel.martensson@stericsson.com | |
5 | * Dmitry.Tarnyagin / dmitry.tarnyagin@stericsson.com | |
6 | * License terms: GNU General Public License (GPL) version 2. | |
7 | */ | |
8 | ||
40d69043 DT |
9 | #include <linux/init.h> |
10 | #include <linux/module.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/if_arp.h> | |
20 | #include <linux/timer.h> | |
21 | #include <net/caif/caif_layer.h> | |
22 | #include <net/caif/caif_hsi.h> | |
23 | ||
24 | MODULE_LICENSE("GPL"); | |
25 | MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>"); | |
26 | MODULE_DESCRIPTION("CAIF HSI driver"); | |
27 | ||
28 | /* Returns the number of padding bytes for alignment. */ | |
29 | #define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\ | |
30 | (((pow)-((x)&((pow)-1))))) | |
31 | ||
32 | /* | |
33 | * HSI padding options. | |
34 | * Warning: must be a base of 2 (& operation used) and can not be zero ! | |
35 | */ | |
36 | static int hsi_head_align = 4; | |
37 | module_param(hsi_head_align, int, S_IRUGO); | |
38 | MODULE_PARM_DESC(hsi_head_align, "HSI head alignment."); | |
39 | ||
40 | static int hsi_tail_align = 4; | |
41 | module_param(hsi_tail_align, int, S_IRUGO); | |
42 | MODULE_PARM_DESC(hsi_tail_align, "HSI tail alignment."); | |
43 | ||
44 | /* | |
45 | * HSI link layer flowcontrol thresholds. | |
46 | * Warning: A high threshold value migth increase throughput but it will at | |
47 | * the same time prevent channel prioritization and increase the risk of | |
48 | * flooding the modem. The high threshold should be above the low. | |
49 | */ | |
50 | static int hsi_high_threshold = 100; | |
51 | module_param(hsi_high_threshold, int, S_IRUGO); | |
52 | MODULE_PARM_DESC(hsi_high_threshold, "HSI high threshold (FLOW OFF)."); | |
53 | ||
54 | static int hsi_low_threshold = 50; | |
55 | module_param(hsi_low_threshold, int, S_IRUGO); | |
56 | MODULE_PARM_DESC(hsi_low_threshold, "HSI high threshold (FLOW ON)."); | |
57 | ||
58 | #define ON 1 | |
59 | #define OFF 0 | |
60 | ||
61 | /* | |
62 | * Threshold values for the HSI packet queue. Flowcontrol will be asserted | |
63 | * when the number of packets exceeds HIGH_WATER_MARK. It will not be | |
64 | * de-asserted before the number of packets drops below LOW_WATER_MARK. | |
65 | */ | |
66 | #define LOW_WATER_MARK hsi_low_threshold | |
67 | #define HIGH_WATER_MARK hsi_high_threshold | |
68 | ||
69 | static LIST_HEAD(cfhsi_list); | |
70 | static spinlock_t cfhsi_list_lock; | |
71 | ||
72 | static void cfhsi_inactivity_tout(unsigned long arg) | |
73 | { | |
74 | struct cfhsi *cfhsi = (struct cfhsi *)arg; | |
75 | ||
76 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
77 | __func__); | |
78 | ||
79 | /* Schedule power down work queue. */ | |
80 | if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
81 | queue_work(cfhsi->wq, &cfhsi->wake_down_work); | |
82 | } | |
83 | ||
84 | static void cfhsi_abort_tx(struct cfhsi *cfhsi) | |
85 | { | |
86 | struct sk_buff *skb; | |
87 | ||
88 | for (;;) { | |
89 | spin_lock_bh(&cfhsi->lock); | |
90 | skb = skb_dequeue(&cfhsi->qhead); | |
91 | if (!skb) | |
92 | break; | |
93 | ||
94 | cfhsi->ndev->stats.tx_errors++; | |
95 | cfhsi->ndev->stats.tx_dropped++; | |
96 | spin_unlock_bh(&cfhsi->lock); | |
97 | kfree_skb(skb); | |
98 | } | |
99 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
100 | if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
101 | mod_timer(&cfhsi->timer, jiffies + CFHSI_INACTIVITY_TOUT); | |
102 | spin_unlock_bh(&cfhsi->lock); | |
103 | } | |
104 | ||
105 | static int cfhsi_flush_fifo(struct cfhsi *cfhsi) | |
106 | { | |
107 | char buffer[32]; /* Any reasonable value */ | |
108 | size_t fifo_occupancy; | |
109 | int ret; | |
110 | ||
111 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
112 | __func__); | |
113 | ||
114 | ||
115 | ret = cfhsi->dev->cfhsi_wake_up(cfhsi->dev); | |
116 | if (ret) { | |
117 | dev_warn(&cfhsi->ndev->dev, | |
118 | "%s: can't wake up HSI interface: %d.\n", | |
119 | __func__, ret); | |
120 | return ret; | |
121 | } | |
122 | ||
123 | do { | |
124 | ret = cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, | |
125 | &fifo_occupancy); | |
126 | if (ret) { | |
127 | dev_warn(&cfhsi->ndev->dev, | |
128 | "%s: can't get FIFO occupancy: %d.\n", | |
129 | __func__, ret); | |
130 | break; | |
131 | } else if (!fifo_occupancy) | |
132 | /* No more data, exitting normally */ | |
133 | break; | |
134 | ||
135 | fifo_occupancy = min(sizeof(buffer), fifo_occupancy); | |
136 | set_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits); | |
137 | ret = cfhsi->dev->cfhsi_rx(buffer, fifo_occupancy, | |
138 | cfhsi->dev); | |
139 | if (ret) { | |
140 | clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits); | |
141 | dev_warn(&cfhsi->ndev->dev, | |
142 | "%s: can't read data: %d.\n", | |
143 | __func__, ret); | |
144 | break; | |
145 | } | |
146 | ||
147 | ret = 5 * HZ; | |
148 | wait_event_interruptible_timeout(cfhsi->flush_fifo_wait, | |
149 | !test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret); | |
150 | ||
151 | if (ret < 0) { | |
152 | dev_warn(&cfhsi->ndev->dev, | |
153 | "%s: can't wait for flush complete: %d.\n", | |
154 | __func__, ret); | |
155 | break; | |
156 | } else if (!ret) { | |
157 | ret = -ETIMEDOUT; | |
158 | dev_warn(&cfhsi->ndev->dev, | |
159 | "%s: timeout waiting for flush complete.\n", | |
160 | __func__); | |
161 | break; | |
162 | } | |
163 | } while (1); | |
164 | ||
165 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
166 | ||
167 | return ret; | |
168 | } | |
169 | ||
170 | static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi) | |
171 | { | |
172 | int nfrms = 0; | |
173 | int pld_len = 0; | |
174 | struct sk_buff *skb; | |
175 | u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; | |
176 | ||
177 | skb = skb_dequeue(&cfhsi->qhead); | |
178 | if (!skb) | |
179 | return 0; | |
180 | ||
181 | /* Check if we can embed a CAIF frame. */ | |
182 | if (skb->len < CFHSI_MAX_EMB_FRM_SZ) { | |
183 | struct caif_payload_info *info; | |
184 | int hpad = 0; | |
185 | int tpad = 0; | |
186 | ||
187 | /* Calculate needed head alignment and tail alignment. */ | |
188 | info = (struct caif_payload_info *)&skb->cb; | |
189 | ||
190 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); | |
191 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); | |
192 | ||
193 | /* Check if frame still fits with added alignment. */ | |
194 | if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) { | |
195 | u8 *pemb = desc->emb_frm; | |
196 | desc->offset = CFHSI_DESC_SHORT_SZ; | |
197 | *pemb = (u8)(hpad - 1); | |
198 | pemb += hpad; | |
199 | ||
200 | /* Update network statistics. */ | |
201 | cfhsi->ndev->stats.tx_packets++; | |
202 | cfhsi->ndev->stats.tx_bytes += skb->len; | |
203 | ||
204 | /* Copy in embedded CAIF frame. */ | |
205 | skb_copy_bits(skb, 0, pemb, skb->len); | |
206 | consume_skb(skb); | |
207 | skb = NULL; | |
208 | } | |
209 | } else | |
210 | /* Clear offset. */ | |
211 | desc->offset = 0; | |
212 | ||
213 | /* Create payload CAIF frames. */ | |
214 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; | |
215 | while (nfrms < CFHSI_MAX_PKTS) { | |
216 | struct caif_payload_info *info; | |
217 | int hpad = 0; | |
218 | int tpad = 0; | |
219 | ||
220 | if (!skb) | |
221 | skb = skb_dequeue(&cfhsi->qhead); | |
222 | ||
223 | if (!skb) | |
224 | break; | |
225 | ||
226 | /* Calculate needed head alignment and tail alignment. */ | |
227 | info = (struct caif_payload_info *)&skb->cb; | |
228 | ||
229 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); | |
230 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); | |
231 | ||
232 | /* Fill in CAIF frame length in descriptor. */ | |
233 | desc->cffrm_len[nfrms] = hpad + skb->len + tpad; | |
234 | ||
235 | /* Fill head padding information. */ | |
236 | *pfrm = (u8)(hpad - 1); | |
237 | pfrm += hpad; | |
238 | ||
239 | /* Update network statistics. */ | |
240 | cfhsi->ndev->stats.tx_packets++; | |
241 | cfhsi->ndev->stats.tx_bytes += skb->len; | |
242 | ||
243 | /* Copy in CAIF frame. */ | |
244 | skb_copy_bits(skb, 0, pfrm, skb->len); | |
245 | ||
246 | /* Update payload length. */ | |
247 | pld_len += desc->cffrm_len[nfrms]; | |
248 | ||
249 | /* Update frame pointer. */ | |
250 | pfrm += skb->len + tpad; | |
251 | consume_skb(skb); | |
252 | skb = NULL; | |
253 | ||
254 | /* Update number of frames. */ | |
255 | nfrms++; | |
256 | } | |
257 | ||
258 | /* Unused length fields should be zero-filled (according to SPEC). */ | |
259 | while (nfrms < CFHSI_MAX_PKTS) { | |
260 | desc->cffrm_len[nfrms] = 0x0000; | |
261 | nfrms++; | |
262 | } | |
263 | ||
264 | /* Check if we can piggy-back another descriptor. */ | |
265 | skb = skb_peek(&cfhsi->qhead); | |
266 | if (skb) | |
267 | desc->header |= CFHSI_PIGGY_DESC; | |
268 | else | |
269 | desc->header &= ~CFHSI_PIGGY_DESC; | |
270 | ||
271 | return CFHSI_DESC_SZ + pld_len; | |
272 | } | |
273 | ||
274 | static void cfhsi_tx_done_work(struct work_struct *work) | |
275 | { | |
276 | struct cfhsi *cfhsi = NULL; | |
277 | struct cfhsi_desc *desc = NULL; | |
278 | int len = 0; | |
279 | int res; | |
280 | ||
281 | cfhsi = container_of(work, struct cfhsi, tx_done_work); | |
282 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
283 | __func__); | |
284 | ||
285 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
286 | return; | |
287 | ||
288 | desc = (struct cfhsi_desc *)cfhsi->tx_buf; | |
289 | ||
290 | do { | |
291 | /* | |
292 | * Send flow on if flow off has been previously signalled | |
293 | * and number of packets is below low water mark. | |
294 | */ | |
295 | spin_lock_bh(&cfhsi->lock); | |
296 | if (cfhsi->flow_off_sent && | |
297 | cfhsi->qhead.qlen <= cfhsi->q_low_mark && | |
298 | cfhsi->cfdev.flowctrl) { | |
299 | ||
300 | cfhsi->flow_off_sent = 0; | |
301 | cfhsi->cfdev.flowctrl(cfhsi->ndev, ON); | |
302 | } | |
303 | spin_unlock_bh(&cfhsi->lock); | |
304 | ||
305 | /* Create HSI frame. */ | |
306 | len = cfhsi_tx_frm(desc, cfhsi); | |
307 | if (!len) { | |
308 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
309 | /* Start inactivity timer. */ | |
310 | mod_timer(&cfhsi->timer, | |
311 | jiffies + CFHSI_INACTIVITY_TOUT); | |
312 | break; | |
313 | } | |
314 | ||
315 | /* Set up new transfer. */ | |
316 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
317 | if (WARN_ON(res < 0)) { | |
318 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
319 | __func__, res); | |
320 | } | |
321 | } while (res < 0); | |
322 | } | |
323 | ||
324 | static void cfhsi_tx_done_cb(struct cfhsi_drv *drv) | |
325 | { | |
326 | struct cfhsi *cfhsi; | |
327 | ||
328 | cfhsi = container_of(drv, struct cfhsi, drv); | |
329 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
330 | __func__); | |
331 | ||
332 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
333 | return; | |
334 | ||
335 | queue_work(cfhsi->wq, &cfhsi->tx_done_work); | |
336 | } | |
337 | ||
338 | static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi) | |
339 | { | |
340 | int xfer_sz = 0; | |
341 | int nfrms = 0; | |
342 | u16 *plen = NULL; | |
343 | u8 *pfrm = NULL; | |
344 | ||
345 | if ((desc->header & ~CFHSI_PIGGY_DESC) || | |
346 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) { | |
347 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", | |
348 | __func__); | |
349 | return 0; | |
350 | } | |
351 | ||
352 | /* Check for embedded CAIF frame. */ | |
353 | if (desc->offset) { | |
354 | struct sk_buff *skb; | |
355 | u8 *dst = NULL; | |
356 | int len = 0, retries = 0; | |
357 | pfrm = ((u8 *)desc) + desc->offset; | |
358 | ||
359 | /* Remove offset padding. */ | |
360 | pfrm += *pfrm + 1; | |
361 | ||
362 | /* Read length of CAIF frame (little endian). */ | |
363 | len = *pfrm; | |
364 | len |= ((*(pfrm+1)) << 8) & 0xFF00; | |
365 | len += 2; /* Add FCS fields. */ | |
366 | ||
367 | ||
368 | /* Allocate SKB (OK even in IRQ context). */ | |
369 | skb = alloc_skb(len + 1, GFP_KERNEL); | |
370 | while (!skb) { | |
371 | retries++; | |
372 | schedule_timeout(1); | |
373 | skb = alloc_skb(len + 1, GFP_KERNEL); | |
374 | if (skb) { | |
375 | printk(KERN_WARNING "%s: slept for %u " | |
376 | "before getting memory\n", | |
377 | __func__, retries); | |
378 | break; | |
379 | } | |
380 | if (retries > HZ) { | |
381 | printk(KERN_ERR "%s: slept for 1HZ and " | |
382 | "did not get memory\n", | |
383 | __func__); | |
384 | cfhsi->ndev->stats.rx_dropped++; | |
385 | goto drop_frame; | |
386 | } | |
387 | } | |
388 | caif_assert(skb != NULL); | |
389 | ||
390 | dst = skb_put(skb, len); | |
391 | memcpy(dst, pfrm, len); | |
392 | ||
393 | skb->protocol = htons(ETH_P_CAIF); | |
394 | skb_reset_mac_header(skb); | |
395 | skb->dev = cfhsi->ndev; | |
396 | ||
397 | /* | |
398 | * We are called from a arch specific platform device. | |
399 | * Unfortunately we don't know what context we're | |
400 | * running in. | |
401 | */ | |
402 | if (in_interrupt()) | |
403 | netif_rx(skb); | |
404 | else | |
405 | netif_rx_ni(skb); | |
406 | ||
407 | /* Update network statistics. */ | |
408 | cfhsi->ndev->stats.rx_packets++; | |
409 | cfhsi->ndev->stats.rx_bytes += len; | |
410 | } | |
411 | ||
412 | drop_frame: | |
413 | /* Calculate transfer length. */ | |
414 | plen = desc->cffrm_len; | |
415 | while (nfrms < CFHSI_MAX_PKTS && *plen) { | |
416 | xfer_sz += *plen; | |
417 | plen++; | |
418 | nfrms++; | |
419 | } | |
420 | ||
421 | /* Check for piggy-backed descriptor. */ | |
422 | if (desc->header & CFHSI_PIGGY_DESC) | |
423 | xfer_sz += CFHSI_DESC_SZ; | |
424 | ||
425 | if (xfer_sz % 4) { | |
426 | dev_err(&cfhsi->ndev->dev, | |
427 | "%s: Invalid payload len: %d, ignored.\n", | |
428 | __func__, xfer_sz); | |
429 | xfer_sz = 0; | |
430 | } | |
431 | ||
432 | return xfer_sz; | |
433 | } | |
434 | ||
435 | static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi) | |
436 | { | |
437 | int rx_sz = 0; | |
438 | int nfrms = 0; | |
439 | u16 *plen = NULL; | |
440 | u8 *pfrm = NULL; | |
441 | ||
442 | /* Sanity check header and offset. */ | |
443 | if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) || | |
444 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ))) { | |
445 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", | |
446 | __func__); | |
447 | return -EINVAL; | |
448 | } | |
449 | ||
450 | /* Set frame pointer to start of payload. */ | |
451 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; | |
452 | plen = desc->cffrm_len; | |
453 | while (nfrms < CFHSI_MAX_PKTS && *plen) { | |
454 | struct sk_buff *skb; | |
455 | u8 *dst = NULL; | |
456 | u8 *pcffrm = NULL; | |
457 | int len = 0, retries = 0; | |
458 | ||
459 | if (WARN_ON(desc->cffrm_len[nfrms] > CFHSI_MAX_PAYLOAD_SZ)) { | |
460 | dev_err(&cfhsi->ndev->dev, "%s: Invalid payload.\n", | |
461 | __func__); | |
462 | return -EINVAL; | |
463 | } | |
464 | ||
465 | /* CAIF frame starts after head padding. */ | |
466 | pcffrm = pfrm + *pfrm + 1; | |
467 | ||
468 | /* Read length of CAIF frame (little endian). */ | |
469 | len = *pcffrm; | |
470 | len |= ((*(pcffrm + 1)) << 8) & 0xFF00; | |
471 | len += 2; /* Add FCS fields. */ | |
472 | ||
473 | /* Allocate SKB (OK even in IRQ context). */ | |
474 | skb = alloc_skb(len + 1, GFP_KERNEL); | |
475 | while (!skb) { | |
476 | retries++; | |
477 | schedule_timeout(1); | |
478 | skb = alloc_skb(len + 1, GFP_KERNEL); | |
479 | if (skb) { | |
480 | printk(KERN_WARNING "%s: slept for %u " | |
481 | "before getting memory\n", | |
482 | __func__, retries); | |
483 | break; | |
484 | } | |
485 | if (retries > HZ) { | |
486 | printk(KERN_ERR "%s: slept for 1HZ " | |
487 | "and did not get memory\n", | |
488 | __func__); | |
489 | cfhsi->ndev->stats.rx_dropped++; | |
490 | goto drop_frame; | |
491 | } | |
492 | } | |
493 | caif_assert(skb != NULL); | |
494 | ||
495 | dst = skb_put(skb, len); | |
496 | memcpy(dst, pcffrm, len); | |
497 | ||
498 | skb->protocol = htons(ETH_P_CAIF); | |
499 | skb_reset_mac_header(skb); | |
500 | skb->dev = cfhsi->ndev; | |
501 | ||
502 | /* | |
503 | * We're called from a platform device, | |
504 | * and don't know the context we're running in. | |
505 | */ | |
506 | if (in_interrupt()) | |
507 | netif_rx(skb); | |
508 | else | |
509 | netif_rx_ni(skb); | |
510 | ||
511 | /* Update network statistics. */ | |
512 | cfhsi->ndev->stats.rx_packets++; | |
513 | cfhsi->ndev->stats.rx_bytes += len; | |
514 | ||
515 | drop_frame: | |
516 | pfrm += *plen; | |
517 | rx_sz += *plen; | |
518 | plen++; | |
519 | nfrms++; | |
520 | } | |
521 | ||
522 | return rx_sz; | |
523 | } | |
524 | ||
525 | static void cfhsi_rx_done_work(struct work_struct *work) | |
526 | { | |
527 | int res; | |
528 | int desc_pld_len = 0; | |
529 | struct cfhsi *cfhsi = NULL; | |
530 | struct cfhsi_desc *desc = NULL; | |
531 | ||
532 | cfhsi = container_of(work, struct cfhsi, rx_done_work); | |
533 | desc = (struct cfhsi_desc *)cfhsi->rx_buf; | |
534 | ||
535 | dev_dbg(&cfhsi->ndev->dev, "%s: Kick timer if pending.\n", | |
536 | __func__); | |
537 | ||
538 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
539 | return; | |
540 | ||
541 | /* Update inactivity timer if pending. */ | |
542 | mod_timer_pending(&cfhsi->timer, jiffies + CFHSI_INACTIVITY_TOUT); | |
543 | ||
544 | if (cfhsi->rx_state == CFHSI_RX_STATE_DESC) { | |
545 | desc_pld_len = cfhsi_rx_desc(desc, cfhsi); | |
546 | } else { | |
547 | int pld_len; | |
548 | ||
549 | pld_len = cfhsi_rx_pld(desc, cfhsi); | |
550 | ||
551 | if ((pld_len > 0) && (desc->header & CFHSI_PIGGY_DESC)) { | |
552 | struct cfhsi_desc *piggy_desc; | |
553 | piggy_desc = (struct cfhsi_desc *) | |
554 | (desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ + | |
555 | pld_len); | |
556 | ||
557 | /* Extract piggy-backed descriptor. */ | |
558 | desc_pld_len = cfhsi_rx_desc(piggy_desc, cfhsi); | |
559 | ||
560 | /* | |
561 | * Copy needed information from the piggy-backed | |
562 | * descriptor to the descriptor in the start. | |
563 | */ | |
564 | memcpy((u8 *)desc, (u8 *)piggy_desc, | |
565 | CFHSI_DESC_SHORT_SZ); | |
566 | } | |
567 | } | |
568 | ||
569 | if (desc_pld_len) { | |
570 | cfhsi->rx_state = CFHSI_RX_STATE_PAYLOAD; | |
571 | cfhsi->rx_ptr = cfhsi->rx_buf + CFHSI_DESC_SZ; | |
572 | cfhsi->rx_len = desc_pld_len; | |
573 | } else { | |
574 | cfhsi->rx_state = CFHSI_RX_STATE_DESC; | |
575 | cfhsi->rx_ptr = cfhsi->rx_buf; | |
576 | cfhsi->rx_len = CFHSI_DESC_SZ; | |
577 | } | |
578 | clear_bit(CFHSI_PENDING_RX, &cfhsi->bits); | |
579 | ||
580 | if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) { | |
581 | /* Set up new transfer. */ | |
582 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", | |
583 | __func__); | |
584 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, | |
585 | cfhsi->dev); | |
586 | if (WARN_ON(res < 0)) { | |
587 | dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n", | |
588 | __func__, res); | |
589 | cfhsi->ndev->stats.rx_errors++; | |
590 | cfhsi->ndev->stats.rx_dropped++; | |
591 | } | |
592 | } | |
593 | } | |
594 | ||
595 | static void cfhsi_rx_done_cb(struct cfhsi_drv *drv) | |
596 | { | |
597 | struct cfhsi *cfhsi; | |
598 | ||
599 | cfhsi = container_of(drv, struct cfhsi, drv); | |
600 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
601 | __func__); | |
602 | ||
603 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
604 | return; | |
605 | ||
606 | set_bit(CFHSI_PENDING_RX, &cfhsi->bits); | |
607 | ||
608 | if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits)) | |
609 | wake_up_interruptible(&cfhsi->flush_fifo_wait); | |
610 | else | |
611 | queue_work(cfhsi->wq, &cfhsi->rx_done_work); | |
612 | } | |
613 | ||
614 | static void cfhsi_wake_up(struct work_struct *work) | |
615 | { | |
616 | struct cfhsi *cfhsi = NULL; | |
617 | int res; | |
618 | int len; | |
619 | long ret; | |
620 | ||
621 | cfhsi = container_of(work, struct cfhsi, wake_up_work); | |
622 | ||
623 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
624 | return; | |
625 | ||
626 | if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) { | |
627 | /* It happenes when wakeup is requested by | |
628 | * both ends at the same time. */ | |
629 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
630 | return; | |
631 | } | |
632 | ||
633 | /* Activate wake line. */ | |
634 | cfhsi->dev->cfhsi_wake_up(cfhsi->dev); | |
635 | ||
636 | dev_dbg(&cfhsi->ndev->dev, "%s: Start waiting.\n", | |
637 | __func__); | |
638 | ||
639 | /* Wait for acknowledge. */ | |
640 | ret = CFHSI_WAKEUP_TOUT; | |
641 | wait_event_interruptible_timeout(cfhsi->wake_up_wait, | |
642 | test_bit(CFHSI_WAKE_UP_ACK, | |
643 | &cfhsi->bits), ret); | |
644 | if (unlikely(ret < 0)) { | |
645 | /* Interrupted by signal. */ | |
646 | dev_info(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", | |
647 | __func__, ret); | |
648 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
649 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
650 | return; | |
651 | } else if (!ret) { | |
652 | /* Wakeup timeout */ | |
653 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", | |
654 | __func__); | |
655 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
656 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
657 | return; | |
658 | } | |
659 | dev_dbg(&cfhsi->ndev->dev, "%s: Woken.\n", | |
660 | __func__); | |
661 | ||
662 | /* Clear power up bit. */ | |
663 | set_bit(CFHSI_AWAKE, &cfhsi->bits); | |
664 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
665 | ||
666 | /* Resume read operation. */ | |
667 | if (!test_bit(CFHSI_PENDING_RX, &cfhsi->bits)) { | |
668 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", | |
669 | __func__); | |
670 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, | |
671 | cfhsi->rx_len, cfhsi->dev); | |
672 | if (WARN_ON(res < 0)) { | |
673 | dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n", | |
674 | __func__, res); | |
675 | } | |
676 | } | |
677 | ||
678 | /* Clear power up acknowledment. */ | |
679 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
680 | ||
681 | spin_lock_bh(&cfhsi->lock); | |
682 | ||
683 | /* Resume transmit if queue is not empty. */ | |
684 | if (!skb_peek(&cfhsi->qhead)) { | |
685 | dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n", | |
686 | __func__); | |
687 | /* Start inactivity timer. */ | |
688 | mod_timer(&cfhsi->timer, | |
689 | jiffies + CFHSI_INACTIVITY_TOUT); | |
690 | spin_unlock_bh(&cfhsi->lock); | |
691 | return; | |
692 | } | |
693 | ||
694 | dev_dbg(&cfhsi->ndev->dev, "%s: Host wake.\n", | |
695 | __func__); | |
696 | ||
697 | spin_unlock_bh(&cfhsi->lock); | |
698 | ||
699 | /* Create HSI frame. */ | |
700 | len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi); | |
701 | ||
702 | if (likely(len > 0)) { | |
703 | /* Set up new transfer. */ | |
704 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
705 | if (WARN_ON(res < 0)) { | |
706 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
707 | __func__, res); | |
708 | cfhsi_abort_tx(cfhsi); | |
709 | } | |
710 | } else { | |
711 | dev_err(&cfhsi->ndev->dev, | |
712 | "%s: Failed to create HSI frame: %d.\n", | |
713 | __func__, len); | |
714 | } | |
715 | ||
716 | } | |
717 | ||
718 | static void cfhsi_wake_down(struct work_struct *work) | |
719 | { | |
720 | long ret; | |
721 | struct cfhsi *cfhsi = NULL; | |
722 | size_t fifo_occupancy; | |
723 | ||
724 | cfhsi = container_of(work, struct cfhsi, wake_down_work); | |
725 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
726 | __func__); | |
727 | ||
728 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
729 | return; | |
730 | ||
731 | /* Check if there is something in FIFO. */ | |
732 | if (WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, | |
733 | &fifo_occupancy))) | |
734 | fifo_occupancy = 0; | |
735 | ||
736 | if (fifo_occupancy) { | |
737 | dev_dbg(&cfhsi->ndev->dev, | |
738 | "%s: %u words in RX FIFO, restart timer.\n", | |
739 | __func__, (unsigned) fifo_occupancy); | |
740 | spin_lock_bh(&cfhsi->lock); | |
741 | mod_timer(&cfhsi->timer, | |
742 | jiffies + CFHSI_INACTIVITY_TOUT); | |
743 | spin_unlock_bh(&cfhsi->lock); | |
744 | return; | |
745 | } | |
746 | ||
747 | /* Cancel pending RX requests */ | |
748 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); | |
749 | ||
750 | /* Deactivate wake line. */ | |
751 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
752 | ||
753 | /* Wait for acknowledge. */ | |
754 | ret = CFHSI_WAKEUP_TOUT; | |
755 | ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait, | |
756 | test_bit(CFHSI_WAKE_DOWN_ACK, | |
757 | &cfhsi->bits), | |
758 | ret); | |
759 | if (ret < 0) { | |
760 | /* Interrupted by signal. */ | |
761 | dev_info(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", | |
762 | __func__, ret); | |
763 | return; | |
764 | } else if (!ret) { | |
765 | /* Timeout */ | |
766 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", | |
767 | __func__); | |
768 | } | |
769 | ||
770 | /* Clear power down acknowledment. */ | |
771 | clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
772 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); | |
773 | ||
774 | /* Check if there is something in FIFO. */ | |
775 | if (WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, | |
776 | &fifo_occupancy))) | |
777 | fifo_occupancy = 0; | |
778 | ||
779 | if (fifo_occupancy) { | |
780 | dev_dbg(&cfhsi->ndev->dev, | |
781 | "%s: %u words in RX FIFO, wakeup forced.\n", | |
782 | __func__, (unsigned) fifo_occupancy); | |
783 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
784 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
785 | } else | |
786 | dev_dbg(&cfhsi->ndev->dev, "%s: Done.\n", | |
787 | __func__); | |
788 | } | |
789 | ||
790 | static void cfhsi_wake_up_cb(struct cfhsi_drv *drv) | |
791 | { | |
792 | struct cfhsi *cfhsi = NULL; | |
793 | ||
794 | cfhsi = container_of(drv, struct cfhsi, drv); | |
795 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
796 | __func__); | |
797 | ||
798 | set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
799 | wake_up_interruptible(&cfhsi->wake_up_wait); | |
800 | ||
801 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
802 | return; | |
803 | ||
804 | /* Schedule wake up work queue if the peer initiates. */ | |
805 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
806 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
807 | } | |
808 | ||
809 | static void cfhsi_wake_down_cb(struct cfhsi_drv *drv) | |
810 | { | |
811 | struct cfhsi *cfhsi = NULL; | |
812 | ||
813 | cfhsi = container_of(drv, struct cfhsi, drv); | |
814 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
815 | __func__); | |
816 | ||
817 | /* Initiating low power is only permitted by the host (us). */ | |
818 | set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
819 | wake_up_interruptible(&cfhsi->wake_down_wait); | |
820 | } | |
821 | ||
822 | static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev) | |
823 | { | |
824 | struct cfhsi *cfhsi = NULL; | |
825 | int start_xfer = 0; | |
826 | int timer_active; | |
827 | ||
828 | if (!dev) | |
829 | return -EINVAL; | |
830 | ||
831 | cfhsi = netdev_priv(dev); | |
832 | ||
833 | spin_lock_bh(&cfhsi->lock); | |
834 | ||
835 | skb_queue_tail(&cfhsi->qhead, skb); | |
836 | ||
837 | /* Sanity check; xmit should not be called after unregister_netdev */ | |
838 | if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) { | |
839 | spin_unlock_bh(&cfhsi->lock); | |
840 | cfhsi_abort_tx(cfhsi); | |
841 | return -EINVAL; | |
842 | } | |
843 | ||
844 | /* Send flow off if number of packets is above high water mark. */ | |
845 | if (!cfhsi->flow_off_sent && | |
846 | cfhsi->qhead.qlen > cfhsi->q_high_mark && | |
847 | cfhsi->cfdev.flowctrl) { | |
848 | cfhsi->flow_off_sent = 1; | |
849 | cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF); | |
850 | } | |
851 | ||
852 | if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) { | |
853 | cfhsi->tx_state = CFHSI_TX_STATE_XFER; | |
854 | start_xfer = 1; | |
855 | } | |
856 | ||
857 | spin_unlock_bh(&cfhsi->lock); | |
858 | ||
859 | if (!start_xfer) | |
860 | return 0; | |
861 | ||
862 | /* Delete inactivity timer if started. */ | |
863 | #ifdef CONFIG_SMP | |
864 | timer_active = del_timer_sync(&cfhsi->timer); | |
865 | #else | |
866 | timer_active = del_timer(&cfhsi->timer); | |
867 | #endif /* CONFIG_SMP */ | |
868 | ||
869 | if (timer_active) { | |
870 | struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf; | |
871 | int len; | |
872 | int res; | |
873 | ||
874 | /* Create HSI frame. */ | |
875 | len = cfhsi_tx_frm(desc, cfhsi); | |
876 | BUG_ON(!len); | |
877 | ||
878 | /* Set up new transfer. */ | |
879 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
880 | if (WARN_ON(res < 0)) { | |
881 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
882 | __func__, res); | |
883 | cfhsi_abort_tx(cfhsi); | |
884 | } | |
885 | } else { | |
886 | /* Schedule wake up work queue if the we initiate. */ | |
887 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
888 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
889 | } | |
890 | ||
891 | return 0; | |
892 | } | |
893 | ||
894 | static int cfhsi_open(struct net_device *dev) | |
895 | { | |
896 | netif_wake_queue(dev); | |
897 | ||
898 | return 0; | |
899 | } | |
900 | ||
901 | static int cfhsi_close(struct net_device *dev) | |
902 | { | |
903 | netif_stop_queue(dev); | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
908 | static const struct net_device_ops cfhsi_ops = { | |
909 | .ndo_open = cfhsi_open, | |
910 | .ndo_stop = cfhsi_close, | |
911 | .ndo_start_xmit = cfhsi_xmit | |
912 | }; | |
913 | ||
914 | static void cfhsi_setup(struct net_device *dev) | |
915 | { | |
916 | struct cfhsi *cfhsi = netdev_priv(dev); | |
917 | dev->features = 0; | |
918 | dev->netdev_ops = &cfhsi_ops; | |
919 | dev->type = ARPHRD_CAIF; | |
920 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
921 | dev->mtu = CFHSI_MAX_PAYLOAD_SZ; | |
922 | dev->tx_queue_len = 0; | |
923 | dev->destructor = free_netdev; | |
924 | skb_queue_head_init(&cfhsi->qhead); | |
925 | cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; | |
926 | cfhsi->cfdev.use_frag = false; | |
927 | cfhsi->cfdev.use_stx = false; | |
928 | cfhsi->cfdev.use_fcs = false; | |
929 | cfhsi->ndev = dev; | |
930 | } | |
931 | ||
932 | int cfhsi_probe(struct platform_device *pdev) | |
933 | { | |
934 | struct cfhsi *cfhsi = NULL; | |
935 | struct net_device *ndev; | |
936 | struct cfhsi_dev *dev; | |
937 | int res; | |
938 | ||
939 | ndev = alloc_netdev(sizeof(struct cfhsi), "cfhsi%d", cfhsi_setup); | |
940 | if (!ndev) { | |
941 | dev_err(&pdev->dev, "%s: alloc_netdev failed.\n", | |
942 | __func__); | |
943 | return -ENODEV; | |
944 | } | |
945 | ||
946 | cfhsi = netdev_priv(ndev); | |
947 | cfhsi->ndev = ndev; | |
948 | cfhsi->pdev = pdev; | |
949 | ||
950 | /* Initialize state vaiables. */ | |
951 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
952 | cfhsi->rx_state = CFHSI_RX_STATE_DESC; | |
953 | ||
954 | /* Set flow info */ | |
955 | cfhsi->flow_off_sent = 0; | |
956 | cfhsi->q_low_mark = LOW_WATER_MARK; | |
957 | cfhsi->q_high_mark = HIGH_WATER_MARK; | |
958 | ||
959 | /* Assign the HSI device. */ | |
960 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; | |
961 | cfhsi->dev = dev; | |
962 | ||
963 | /* Assign the driver to this HSI device. */ | |
964 | dev->drv = &cfhsi->drv; | |
965 | ||
966 | /* | |
967 | * Allocate a TX buffer with the size of a HSI packet descriptors | |
968 | * and the necessary room for CAIF payload frames. | |
969 | */ | |
970 | cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL); | |
971 | if (!cfhsi->tx_buf) { | |
972 | dev_err(&ndev->dev, "%s: Failed to allocate TX buffer.\n", | |
973 | __func__); | |
974 | res = -ENODEV; | |
975 | goto err_alloc_tx; | |
976 | } | |
977 | ||
978 | /* | |
979 | * Allocate a RX buffer with the size of two HSI packet descriptors and | |
980 | * the necessary room for CAIF payload frames. | |
981 | */ | |
982 | cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL); | |
983 | if (!cfhsi->rx_buf) { | |
984 | dev_err(&ndev->dev, "%s: Failed to allocate RX buffer.\n", | |
985 | __func__); | |
986 | res = -ENODEV; | |
987 | goto err_alloc_rx; | |
988 | } | |
989 | ||
864834f9 | 990 | /* Initialize receive variables. */ |
40d69043 DT |
991 | cfhsi->rx_ptr = cfhsi->rx_buf; |
992 | cfhsi->rx_len = CFHSI_DESC_SZ; | |
993 | ||
994 | /* Initialize spin locks. */ | |
995 | spin_lock_init(&cfhsi->lock); | |
996 | ||
997 | /* Set up the driver. */ | |
998 | cfhsi->drv.tx_done_cb = cfhsi_tx_done_cb; | |
999 | cfhsi->drv.rx_done_cb = cfhsi_rx_done_cb; | |
1000 | ||
1001 | /* Initialize the work queues. */ | |
1002 | INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up); | |
1003 | INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down); | |
1004 | INIT_WORK(&cfhsi->rx_done_work, cfhsi_rx_done_work); | |
1005 | INIT_WORK(&cfhsi->tx_done_work, cfhsi_tx_done_work); | |
1006 | ||
1007 | /* Clear all bit fields. */ | |
1008 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
1009 | clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
1010 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
1011 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); | |
1012 | clear_bit(CFHSI_PENDING_RX, &cfhsi->bits); | |
1013 | ||
1014 | /* Create work thread. */ | |
1015 | cfhsi->wq = create_singlethread_workqueue(pdev->name); | |
1016 | if (!cfhsi->wq) { | |
1017 | dev_err(&ndev->dev, "%s: Failed to create work queue.\n", | |
1018 | __func__); | |
1019 | res = -ENODEV; | |
1020 | goto err_create_wq; | |
1021 | } | |
1022 | ||
1023 | /* Initialize wait queues. */ | |
1024 | init_waitqueue_head(&cfhsi->wake_up_wait); | |
1025 | init_waitqueue_head(&cfhsi->wake_down_wait); | |
1026 | init_waitqueue_head(&cfhsi->flush_fifo_wait); | |
1027 | ||
1028 | /* Setup the inactivity timer. */ | |
1029 | init_timer(&cfhsi->timer); | |
1030 | cfhsi->timer.data = (unsigned long)cfhsi; | |
1031 | cfhsi->timer.function = cfhsi_inactivity_tout; | |
1032 | ||
1033 | /* Add CAIF HSI device to list. */ | |
1034 | spin_lock(&cfhsi_list_lock); | |
1035 | list_add_tail(&cfhsi->list, &cfhsi_list); | |
1036 | spin_unlock(&cfhsi_list_lock); | |
1037 | ||
1038 | /* Activate HSI interface. */ | |
1039 | res = cfhsi->dev->cfhsi_up(cfhsi->dev); | |
1040 | if (res) { | |
1041 | dev_err(&cfhsi->ndev->dev, | |
1042 | "%s: can't activate HSI interface: %d.\n", | |
1043 | __func__, res); | |
1044 | goto err_activate; | |
1045 | } | |
1046 | ||
1047 | /* Flush FIFO */ | |
1048 | res = cfhsi_flush_fifo(cfhsi); | |
1049 | if (res) { | |
1050 | dev_err(&ndev->dev, "%s: Can't flush FIFO: %d.\n", | |
1051 | __func__, res); | |
1052 | goto err_net_reg; | |
1053 | } | |
1054 | ||
1055 | cfhsi->drv.wake_up_cb = cfhsi_wake_up_cb; | |
1056 | cfhsi->drv.wake_down_cb = cfhsi_wake_down_cb; | |
1057 | ||
1058 | /* Register network device. */ | |
1059 | res = register_netdev(ndev); | |
1060 | if (res) { | |
1061 | dev_err(&ndev->dev, "%s: Registration error: %d.\n", | |
1062 | __func__, res); | |
1063 | goto err_net_reg; | |
1064 | } | |
1065 | ||
1066 | netif_stop_queue(ndev); | |
1067 | ||
1068 | return res; | |
1069 | ||
1070 | err_net_reg: | |
1071 | cfhsi->dev->cfhsi_down(cfhsi->dev); | |
1072 | err_activate: | |
1073 | destroy_workqueue(cfhsi->wq); | |
1074 | err_create_wq: | |
1075 | kfree(cfhsi->rx_buf); | |
1076 | err_alloc_rx: | |
1077 | kfree(cfhsi->tx_buf); | |
1078 | err_alloc_tx: | |
1079 | free_netdev(ndev); | |
1080 | ||
1081 | return res; | |
1082 | } | |
1083 | ||
1084 | static void cfhsi_shutdown(struct cfhsi *cfhsi, bool remove_platform_dev) | |
1085 | { | |
1086 | u8 *tx_buf, *rx_buf; | |
1087 | ||
1088 | /* Stop TXing */ | |
1089 | netif_tx_stop_all_queues(cfhsi->ndev); | |
1090 | ||
1091 | /* going to shutdown driver */ | |
1092 | set_bit(CFHSI_SHUTDOWN, &cfhsi->bits); | |
1093 | ||
1094 | if (remove_platform_dev) { | |
1095 | /* Flush workqueue */ | |
1096 | flush_workqueue(cfhsi->wq); | |
1097 | ||
1098 | /* Notify device. */ | |
1099 | platform_device_unregister(cfhsi->pdev); | |
1100 | } | |
1101 | ||
1102 | /* Flush workqueue */ | |
1103 | flush_workqueue(cfhsi->wq); | |
1104 | ||
1105 | /* Delete timer if pending */ | |
1106 | #ifdef CONFIG_SMP | |
1107 | del_timer_sync(&cfhsi->timer); | |
1108 | #else | |
1109 | del_timer(&cfhsi->timer); | |
1110 | #endif /* CONFIG_SMP */ | |
1111 | ||
1112 | /* Cancel pending RX request (if any) */ | |
1113 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); | |
1114 | ||
1115 | /* Flush again and destroy workqueue */ | |
1116 | destroy_workqueue(cfhsi->wq); | |
1117 | ||
1118 | /* Store bufferes: will be freed later. */ | |
1119 | tx_buf = cfhsi->tx_buf; | |
1120 | rx_buf = cfhsi->rx_buf; | |
1121 | ||
1122 | /* Flush transmit queues. */ | |
1123 | cfhsi_abort_tx(cfhsi); | |
1124 | ||
1125 | /* Deactivate interface */ | |
1126 | cfhsi->dev->cfhsi_down(cfhsi->dev); | |
1127 | ||
1128 | /* Finally unregister the network device. */ | |
1129 | unregister_netdev(cfhsi->ndev); | |
1130 | ||
1131 | /* Free buffers. */ | |
1132 | kfree(tx_buf); | |
1133 | kfree(rx_buf); | |
1134 | } | |
1135 | ||
1136 | int cfhsi_remove(struct platform_device *pdev) | |
1137 | { | |
1138 | struct list_head *list_node; | |
1139 | struct list_head *n; | |
1140 | struct cfhsi *cfhsi = NULL; | |
1141 | struct cfhsi_dev *dev; | |
1142 | ||
1143 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; | |
1144 | spin_lock(&cfhsi_list_lock); | |
1145 | list_for_each_safe(list_node, n, &cfhsi_list) { | |
1146 | cfhsi = list_entry(list_node, struct cfhsi, list); | |
1147 | /* Find the corresponding device. */ | |
1148 | if (cfhsi->dev == dev) { | |
1149 | /* Remove from list. */ | |
1150 | list_del(list_node); | |
1151 | spin_unlock(&cfhsi_list_lock); | |
1152 | ||
1153 | /* Shutdown driver. */ | |
1154 | cfhsi_shutdown(cfhsi, false); | |
1155 | ||
1156 | return 0; | |
1157 | } | |
1158 | } | |
1159 | spin_unlock(&cfhsi_list_lock); | |
1160 | return -ENODEV; | |
1161 | } | |
1162 | ||
1163 | struct platform_driver cfhsi_plat_drv = { | |
1164 | .probe = cfhsi_probe, | |
1165 | .remove = cfhsi_remove, | |
1166 | .driver = { | |
1167 | .name = "cfhsi", | |
1168 | .owner = THIS_MODULE, | |
1169 | }, | |
1170 | }; | |
1171 | ||
1172 | static void __exit cfhsi_exit_module(void) | |
1173 | { | |
1174 | struct list_head *list_node; | |
1175 | struct list_head *n; | |
1176 | struct cfhsi *cfhsi = NULL; | |
1177 | ||
1178 | spin_lock(&cfhsi_list_lock); | |
1179 | list_for_each_safe(list_node, n, &cfhsi_list) { | |
1180 | cfhsi = list_entry(list_node, struct cfhsi, list); | |
1181 | ||
1182 | /* Remove from list. */ | |
1183 | list_del(list_node); | |
1184 | spin_unlock(&cfhsi_list_lock); | |
1185 | ||
1186 | /* Shutdown driver. */ | |
1187 | cfhsi_shutdown(cfhsi, true); | |
1188 | ||
1189 | spin_lock(&cfhsi_list_lock); | |
1190 | } | |
1191 | spin_unlock(&cfhsi_list_lock); | |
1192 | ||
1193 | /* Unregister platform driver. */ | |
1194 | platform_driver_unregister(&cfhsi_plat_drv); | |
1195 | } | |
1196 | ||
1197 | static int __init cfhsi_init_module(void) | |
1198 | { | |
1199 | int result; | |
1200 | ||
1201 | /* Initialize spin lock. */ | |
1202 | spin_lock_init(&cfhsi_list_lock); | |
1203 | ||
1204 | /* Register platform driver. */ | |
1205 | result = platform_driver_register(&cfhsi_plat_drv); | |
1206 | if (result) { | |
1207 | printk(KERN_ERR "Could not register platform HSI driver: %d.\n", | |
1208 | result); | |
1209 | goto err_dev_register; | |
1210 | } | |
1211 | ||
1212 | return result; | |
1213 | ||
1214 | err_dev_register: | |
1215 | return result; | |
1216 | } | |
1217 | ||
1218 | module_init(cfhsi_init_module); | |
1219 | module_exit(cfhsi_exit_module); |