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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 | ||
94230feb | 181 | /* Clear offset. */ |
182 | desc->offset = 0; | |
183 | ||
40d69043 DT |
184 | /* Check if we can embed a CAIF frame. */ |
185 | if (skb->len < CFHSI_MAX_EMB_FRM_SZ) { | |
186 | struct caif_payload_info *info; | |
187 | int hpad = 0; | |
188 | int tpad = 0; | |
189 | ||
190 | /* Calculate needed head alignment and tail alignment. */ | |
191 | info = (struct caif_payload_info *)&skb->cb; | |
192 | ||
193 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); | |
194 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); | |
195 | ||
196 | /* Check if frame still fits with added alignment. */ | |
197 | if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) { | |
198 | u8 *pemb = desc->emb_frm; | |
199 | desc->offset = CFHSI_DESC_SHORT_SZ; | |
200 | *pemb = (u8)(hpad - 1); | |
201 | pemb += hpad; | |
202 | ||
203 | /* Update network statistics. */ | |
204 | cfhsi->ndev->stats.tx_packets++; | |
205 | cfhsi->ndev->stats.tx_bytes += skb->len; | |
206 | ||
207 | /* Copy in embedded CAIF frame. */ | |
208 | skb_copy_bits(skb, 0, pemb, skb->len); | |
209 | consume_skb(skb); | |
210 | skb = NULL; | |
211 | } | |
94230feb | 212 | } |
40d69043 DT |
213 | |
214 | /* Create payload CAIF frames. */ | |
215 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; | |
216 | while (nfrms < CFHSI_MAX_PKTS) { | |
217 | struct caif_payload_info *info; | |
218 | int hpad = 0; | |
219 | int tpad = 0; | |
220 | ||
221 | if (!skb) | |
222 | skb = skb_dequeue(&cfhsi->qhead); | |
223 | ||
224 | if (!skb) | |
225 | break; | |
226 | ||
227 | /* Calculate needed head alignment and tail alignment. */ | |
228 | info = (struct caif_payload_info *)&skb->cb; | |
229 | ||
230 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); | |
231 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); | |
232 | ||
233 | /* Fill in CAIF frame length in descriptor. */ | |
234 | desc->cffrm_len[nfrms] = hpad + skb->len + tpad; | |
235 | ||
236 | /* Fill head padding information. */ | |
237 | *pfrm = (u8)(hpad - 1); | |
238 | pfrm += hpad; | |
239 | ||
240 | /* Update network statistics. */ | |
241 | cfhsi->ndev->stats.tx_packets++; | |
242 | cfhsi->ndev->stats.tx_bytes += skb->len; | |
243 | ||
244 | /* Copy in CAIF frame. */ | |
245 | skb_copy_bits(skb, 0, pfrm, skb->len); | |
246 | ||
247 | /* Update payload length. */ | |
248 | pld_len += desc->cffrm_len[nfrms]; | |
249 | ||
250 | /* Update frame pointer. */ | |
251 | pfrm += skb->len + tpad; | |
252 | consume_skb(skb); | |
253 | skb = NULL; | |
254 | ||
255 | /* Update number of frames. */ | |
256 | nfrms++; | |
257 | } | |
258 | ||
259 | /* Unused length fields should be zero-filled (according to SPEC). */ | |
260 | while (nfrms < CFHSI_MAX_PKTS) { | |
261 | desc->cffrm_len[nfrms] = 0x0000; | |
262 | nfrms++; | |
263 | } | |
264 | ||
265 | /* Check if we can piggy-back another descriptor. */ | |
266 | skb = skb_peek(&cfhsi->qhead); | |
267 | if (skb) | |
268 | desc->header |= CFHSI_PIGGY_DESC; | |
269 | else | |
270 | desc->header &= ~CFHSI_PIGGY_DESC; | |
271 | ||
272 | return CFHSI_DESC_SZ + pld_len; | |
273 | } | |
274 | ||
275 | static void cfhsi_tx_done_work(struct work_struct *work) | |
276 | { | |
277 | struct cfhsi *cfhsi = NULL; | |
278 | struct cfhsi_desc *desc = NULL; | |
279 | int len = 0; | |
280 | int res; | |
281 | ||
282 | cfhsi = container_of(work, struct cfhsi, tx_done_work); | |
283 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
284 | __func__); | |
285 | ||
286 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
287 | return; | |
288 | ||
289 | desc = (struct cfhsi_desc *)cfhsi->tx_buf; | |
290 | ||
291 | do { | |
292 | /* | |
293 | * Send flow on if flow off has been previously signalled | |
294 | * and number of packets is below low water mark. | |
295 | */ | |
296 | spin_lock_bh(&cfhsi->lock); | |
297 | if (cfhsi->flow_off_sent && | |
298 | cfhsi->qhead.qlen <= cfhsi->q_low_mark && | |
299 | cfhsi->cfdev.flowctrl) { | |
300 | ||
301 | cfhsi->flow_off_sent = 0; | |
302 | cfhsi->cfdev.flowctrl(cfhsi->ndev, ON); | |
303 | } | |
304 | spin_unlock_bh(&cfhsi->lock); | |
305 | ||
306 | /* Create HSI frame. */ | |
fe47f125 DT |
307 | do { |
308 | len = cfhsi_tx_frm(desc, cfhsi); | |
309 | if (!len) { | |
310 | spin_lock_bh(&cfhsi->lock); | |
311 | if (unlikely(skb_peek(&cfhsi->qhead))) { | |
312 | spin_unlock_bh(&cfhsi->lock); | |
313 | continue; | |
314 | } | |
315 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
316 | /* Start inactivity timer. */ | |
317 | mod_timer(&cfhsi->timer, | |
40d69043 | 318 | jiffies + CFHSI_INACTIVITY_TOUT); |
fe47f125 DT |
319 | spin_unlock_bh(&cfhsi->lock); |
320 | goto done; | |
321 | } | |
322 | } while (!len); | |
40d69043 DT |
323 | |
324 | /* Set up new transfer. */ | |
325 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
326 | if (WARN_ON(res < 0)) { | |
327 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
328 | __func__, res); | |
329 | } | |
330 | } while (res < 0); | |
fe47f125 DT |
331 | |
332 | done: | |
333 | return; | |
40d69043 DT |
334 | } |
335 | ||
336 | static void cfhsi_tx_done_cb(struct cfhsi_drv *drv) | |
337 | { | |
338 | struct cfhsi *cfhsi; | |
339 | ||
340 | cfhsi = container_of(drv, struct cfhsi, drv); | |
341 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
342 | __func__); | |
343 | ||
344 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
345 | return; | |
346 | ||
347 | queue_work(cfhsi->wq, &cfhsi->tx_done_work); | |
348 | } | |
349 | ||
350 | static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi) | |
351 | { | |
352 | int xfer_sz = 0; | |
353 | int nfrms = 0; | |
354 | u16 *plen = NULL; | |
355 | u8 *pfrm = NULL; | |
356 | ||
357 | if ((desc->header & ~CFHSI_PIGGY_DESC) || | |
358 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) { | |
359 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", | |
360 | __func__); | |
361 | return 0; | |
362 | } | |
363 | ||
364 | /* Check for embedded CAIF frame. */ | |
365 | if (desc->offset) { | |
366 | struct sk_buff *skb; | |
367 | u8 *dst = NULL; | |
368 | int len = 0, retries = 0; | |
369 | pfrm = ((u8 *)desc) + desc->offset; | |
370 | ||
371 | /* Remove offset padding. */ | |
372 | pfrm += *pfrm + 1; | |
373 | ||
374 | /* Read length of CAIF frame (little endian). */ | |
375 | len = *pfrm; | |
376 | len |= ((*(pfrm+1)) << 8) & 0xFF00; | |
377 | len += 2; /* Add FCS fields. */ | |
378 | ||
379 | ||
380 | /* Allocate SKB (OK even in IRQ context). */ | |
381 | skb = alloc_skb(len + 1, GFP_KERNEL); | |
382 | while (!skb) { | |
383 | retries++; | |
384 | schedule_timeout(1); | |
385 | skb = alloc_skb(len + 1, GFP_KERNEL); | |
386 | if (skb) { | |
387 | printk(KERN_WARNING "%s: slept for %u " | |
388 | "before getting memory\n", | |
389 | __func__, retries); | |
390 | break; | |
391 | } | |
392 | if (retries > HZ) { | |
393 | printk(KERN_ERR "%s: slept for 1HZ and " | |
394 | "did not get memory\n", | |
395 | __func__); | |
396 | cfhsi->ndev->stats.rx_dropped++; | |
397 | goto drop_frame; | |
398 | } | |
399 | } | |
400 | caif_assert(skb != NULL); | |
401 | ||
402 | dst = skb_put(skb, len); | |
403 | memcpy(dst, pfrm, len); | |
404 | ||
405 | skb->protocol = htons(ETH_P_CAIF); | |
406 | skb_reset_mac_header(skb); | |
407 | skb->dev = cfhsi->ndev; | |
408 | ||
409 | /* | |
410 | * We are called from a arch specific platform device. | |
411 | * Unfortunately we don't know what context we're | |
412 | * running in. | |
413 | */ | |
414 | if (in_interrupt()) | |
415 | netif_rx(skb); | |
416 | else | |
417 | netif_rx_ni(skb); | |
418 | ||
419 | /* Update network statistics. */ | |
420 | cfhsi->ndev->stats.rx_packets++; | |
421 | cfhsi->ndev->stats.rx_bytes += len; | |
422 | } | |
423 | ||
424 | drop_frame: | |
425 | /* Calculate transfer length. */ | |
426 | plen = desc->cffrm_len; | |
427 | while (nfrms < CFHSI_MAX_PKTS && *plen) { | |
428 | xfer_sz += *plen; | |
429 | plen++; | |
430 | nfrms++; | |
431 | } | |
432 | ||
433 | /* Check for piggy-backed descriptor. */ | |
434 | if (desc->header & CFHSI_PIGGY_DESC) | |
435 | xfer_sz += CFHSI_DESC_SZ; | |
436 | ||
437 | if (xfer_sz % 4) { | |
438 | dev_err(&cfhsi->ndev->dev, | |
439 | "%s: Invalid payload len: %d, ignored.\n", | |
440 | __func__, xfer_sz); | |
441 | xfer_sz = 0; | |
442 | } | |
443 | ||
444 | return xfer_sz; | |
445 | } | |
446 | ||
447 | static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi) | |
448 | { | |
449 | int rx_sz = 0; | |
450 | int nfrms = 0; | |
451 | u16 *plen = NULL; | |
452 | u8 *pfrm = NULL; | |
453 | ||
454 | /* Sanity check header and offset. */ | |
455 | if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) || | |
456 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ))) { | |
457 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", | |
458 | __func__); | |
459 | return -EINVAL; | |
460 | } | |
461 | ||
462 | /* Set frame pointer to start of payload. */ | |
463 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; | |
464 | plen = desc->cffrm_len; | |
465 | while (nfrms < CFHSI_MAX_PKTS && *plen) { | |
466 | struct sk_buff *skb; | |
467 | u8 *dst = NULL; | |
468 | u8 *pcffrm = NULL; | |
469 | int len = 0, retries = 0; | |
470 | ||
471 | if (WARN_ON(desc->cffrm_len[nfrms] > CFHSI_MAX_PAYLOAD_SZ)) { | |
472 | dev_err(&cfhsi->ndev->dev, "%s: Invalid payload.\n", | |
473 | __func__); | |
474 | return -EINVAL; | |
475 | } | |
476 | ||
477 | /* CAIF frame starts after head padding. */ | |
478 | pcffrm = pfrm + *pfrm + 1; | |
479 | ||
480 | /* Read length of CAIF frame (little endian). */ | |
481 | len = *pcffrm; | |
482 | len |= ((*(pcffrm + 1)) << 8) & 0xFF00; | |
483 | len += 2; /* Add FCS fields. */ | |
484 | ||
485 | /* Allocate SKB (OK even in IRQ context). */ | |
486 | skb = alloc_skb(len + 1, GFP_KERNEL); | |
487 | while (!skb) { | |
488 | retries++; | |
489 | schedule_timeout(1); | |
490 | skb = alloc_skb(len + 1, GFP_KERNEL); | |
491 | if (skb) { | |
492 | printk(KERN_WARNING "%s: slept for %u " | |
493 | "before getting memory\n", | |
494 | __func__, retries); | |
495 | break; | |
496 | } | |
497 | if (retries > HZ) { | |
498 | printk(KERN_ERR "%s: slept for 1HZ " | |
499 | "and did not get memory\n", | |
500 | __func__); | |
501 | cfhsi->ndev->stats.rx_dropped++; | |
502 | goto drop_frame; | |
503 | } | |
504 | } | |
505 | caif_assert(skb != NULL); | |
506 | ||
507 | dst = skb_put(skb, len); | |
508 | memcpy(dst, pcffrm, len); | |
509 | ||
510 | skb->protocol = htons(ETH_P_CAIF); | |
511 | skb_reset_mac_header(skb); | |
512 | skb->dev = cfhsi->ndev; | |
513 | ||
514 | /* | |
515 | * We're called from a platform device, | |
516 | * and don't know the context we're running in. | |
517 | */ | |
518 | if (in_interrupt()) | |
519 | netif_rx(skb); | |
520 | else | |
521 | netif_rx_ni(skb); | |
522 | ||
523 | /* Update network statistics. */ | |
524 | cfhsi->ndev->stats.rx_packets++; | |
525 | cfhsi->ndev->stats.rx_bytes += len; | |
526 | ||
527 | drop_frame: | |
528 | pfrm += *plen; | |
529 | rx_sz += *plen; | |
530 | plen++; | |
531 | nfrms++; | |
532 | } | |
533 | ||
534 | return rx_sz; | |
535 | } | |
536 | ||
537 | static void cfhsi_rx_done_work(struct work_struct *work) | |
538 | { | |
539 | int res; | |
540 | int desc_pld_len = 0; | |
541 | struct cfhsi *cfhsi = NULL; | |
542 | struct cfhsi_desc *desc = NULL; | |
543 | ||
544 | cfhsi = container_of(work, struct cfhsi, rx_done_work); | |
545 | desc = (struct cfhsi_desc *)cfhsi->rx_buf; | |
546 | ||
547 | dev_dbg(&cfhsi->ndev->dev, "%s: Kick timer if pending.\n", | |
548 | __func__); | |
549 | ||
550 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
551 | return; | |
552 | ||
553 | /* Update inactivity timer if pending. */ | |
73033c98 | 554 | spin_lock_bh(&cfhsi->lock); |
40d69043 | 555 | mod_timer_pending(&cfhsi->timer, jiffies + CFHSI_INACTIVITY_TOUT); |
73033c98 | 556 | spin_unlock_bh(&cfhsi->lock); |
40d69043 DT |
557 | |
558 | if (cfhsi->rx_state == CFHSI_RX_STATE_DESC) { | |
559 | desc_pld_len = cfhsi_rx_desc(desc, cfhsi); | |
560 | } else { | |
561 | int pld_len; | |
562 | ||
563 | pld_len = cfhsi_rx_pld(desc, cfhsi); | |
564 | ||
565 | if ((pld_len > 0) && (desc->header & CFHSI_PIGGY_DESC)) { | |
566 | struct cfhsi_desc *piggy_desc; | |
567 | piggy_desc = (struct cfhsi_desc *) | |
568 | (desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ + | |
569 | pld_len); | |
570 | ||
571 | /* Extract piggy-backed descriptor. */ | |
572 | desc_pld_len = cfhsi_rx_desc(piggy_desc, cfhsi); | |
573 | ||
574 | /* | |
575 | * Copy needed information from the piggy-backed | |
576 | * descriptor to the descriptor in the start. | |
577 | */ | |
578 | memcpy((u8 *)desc, (u8 *)piggy_desc, | |
579 | CFHSI_DESC_SHORT_SZ); | |
580 | } | |
581 | } | |
582 | ||
583 | if (desc_pld_len) { | |
584 | cfhsi->rx_state = CFHSI_RX_STATE_PAYLOAD; | |
585 | cfhsi->rx_ptr = cfhsi->rx_buf + CFHSI_DESC_SZ; | |
586 | cfhsi->rx_len = desc_pld_len; | |
587 | } else { | |
588 | cfhsi->rx_state = CFHSI_RX_STATE_DESC; | |
589 | cfhsi->rx_ptr = cfhsi->rx_buf; | |
590 | cfhsi->rx_len = CFHSI_DESC_SZ; | |
591 | } | |
592 | clear_bit(CFHSI_PENDING_RX, &cfhsi->bits); | |
593 | ||
594 | if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) { | |
595 | /* Set up new transfer. */ | |
596 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", | |
597 | __func__); | |
598 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, | |
599 | cfhsi->dev); | |
600 | if (WARN_ON(res < 0)) { | |
601 | dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n", | |
602 | __func__, res); | |
603 | cfhsi->ndev->stats.rx_errors++; | |
604 | cfhsi->ndev->stats.rx_dropped++; | |
605 | } | |
606 | } | |
607 | } | |
608 | ||
609 | static void cfhsi_rx_done_cb(struct cfhsi_drv *drv) | |
610 | { | |
611 | struct cfhsi *cfhsi; | |
612 | ||
613 | cfhsi = container_of(drv, struct cfhsi, drv); | |
614 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
615 | __func__); | |
616 | ||
617 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
618 | return; | |
619 | ||
620 | set_bit(CFHSI_PENDING_RX, &cfhsi->bits); | |
621 | ||
622 | if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits)) | |
623 | wake_up_interruptible(&cfhsi->flush_fifo_wait); | |
624 | else | |
625 | queue_work(cfhsi->wq, &cfhsi->rx_done_work); | |
626 | } | |
627 | ||
628 | static void cfhsi_wake_up(struct work_struct *work) | |
629 | { | |
630 | struct cfhsi *cfhsi = NULL; | |
631 | int res; | |
632 | int len; | |
633 | long ret; | |
634 | ||
635 | cfhsi = container_of(work, struct cfhsi, wake_up_work); | |
636 | ||
637 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
638 | return; | |
639 | ||
640 | if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) { | |
641 | /* It happenes when wakeup is requested by | |
642 | * both ends at the same time. */ | |
643 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
644 | return; | |
645 | } | |
646 | ||
647 | /* Activate wake line. */ | |
648 | cfhsi->dev->cfhsi_wake_up(cfhsi->dev); | |
649 | ||
650 | dev_dbg(&cfhsi->ndev->dev, "%s: Start waiting.\n", | |
651 | __func__); | |
652 | ||
653 | /* Wait for acknowledge. */ | |
654 | ret = CFHSI_WAKEUP_TOUT; | |
655 | wait_event_interruptible_timeout(cfhsi->wake_up_wait, | |
656 | test_bit(CFHSI_WAKE_UP_ACK, | |
657 | &cfhsi->bits), ret); | |
658 | if (unlikely(ret < 0)) { | |
659 | /* Interrupted by signal. */ | |
660 | dev_info(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", | |
661 | __func__, ret); | |
662 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
663 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
664 | return; | |
665 | } else if (!ret) { | |
666 | /* Wakeup timeout */ | |
667 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", | |
668 | __func__); | |
669 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
670 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
671 | return; | |
672 | } | |
673 | dev_dbg(&cfhsi->ndev->dev, "%s: Woken.\n", | |
674 | __func__); | |
675 | ||
676 | /* Clear power up bit. */ | |
677 | set_bit(CFHSI_AWAKE, &cfhsi->bits); | |
678 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
679 | ||
680 | /* Resume read operation. */ | |
681 | if (!test_bit(CFHSI_PENDING_RX, &cfhsi->bits)) { | |
682 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", | |
683 | __func__); | |
684 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, | |
685 | cfhsi->rx_len, cfhsi->dev); | |
686 | if (WARN_ON(res < 0)) { | |
687 | dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n", | |
688 | __func__, res); | |
689 | } | |
690 | } | |
691 | ||
692 | /* Clear power up acknowledment. */ | |
693 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
694 | ||
695 | spin_lock_bh(&cfhsi->lock); | |
696 | ||
697 | /* Resume transmit if queue is not empty. */ | |
698 | if (!skb_peek(&cfhsi->qhead)) { | |
699 | dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n", | |
700 | __func__); | |
701 | /* Start inactivity timer. */ | |
702 | mod_timer(&cfhsi->timer, | |
703 | jiffies + CFHSI_INACTIVITY_TOUT); | |
704 | spin_unlock_bh(&cfhsi->lock); | |
705 | return; | |
706 | } | |
707 | ||
708 | dev_dbg(&cfhsi->ndev->dev, "%s: Host wake.\n", | |
709 | __func__); | |
710 | ||
711 | spin_unlock_bh(&cfhsi->lock); | |
712 | ||
713 | /* Create HSI frame. */ | |
714 | len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi); | |
715 | ||
716 | if (likely(len > 0)) { | |
717 | /* Set up new transfer. */ | |
718 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
719 | if (WARN_ON(res < 0)) { | |
720 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
721 | __func__, res); | |
722 | cfhsi_abort_tx(cfhsi); | |
723 | } | |
724 | } else { | |
725 | dev_err(&cfhsi->ndev->dev, | |
726 | "%s: Failed to create HSI frame: %d.\n", | |
727 | __func__, len); | |
728 | } | |
729 | ||
730 | } | |
731 | ||
732 | static void cfhsi_wake_down(struct work_struct *work) | |
733 | { | |
734 | long ret; | |
735 | struct cfhsi *cfhsi = NULL; | |
736 | size_t fifo_occupancy; | |
737 | ||
738 | cfhsi = container_of(work, struct cfhsi, wake_down_work); | |
739 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
740 | __func__); | |
741 | ||
742 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
743 | return; | |
744 | ||
745 | /* Check if there is something in FIFO. */ | |
746 | if (WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, | |
747 | &fifo_occupancy))) | |
748 | fifo_occupancy = 0; | |
749 | ||
750 | if (fifo_occupancy) { | |
751 | dev_dbg(&cfhsi->ndev->dev, | |
752 | "%s: %u words in RX FIFO, restart timer.\n", | |
753 | __func__, (unsigned) fifo_occupancy); | |
754 | spin_lock_bh(&cfhsi->lock); | |
755 | mod_timer(&cfhsi->timer, | |
756 | jiffies + CFHSI_INACTIVITY_TOUT); | |
757 | spin_unlock_bh(&cfhsi->lock); | |
758 | return; | |
759 | } | |
760 | ||
761 | /* Cancel pending RX requests */ | |
762 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); | |
763 | ||
764 | /* Deactivate wake line. */ | |
765 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
766 | ||
767 | /* Wait for acknowledge. */ | |
768 | ret = CFHSI_WAKEUP_TOUT; | |
769 | ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait, | |
770 | test_bit(CFHSI_WAKE_DOWN_ACK, | |
771 | &cfhsi->bits), | |
772 | ret); | |
773 | if (ret < 0) { | |
774 | /* Interrupted by signal. */ | |
775 | dev_info(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", | |
776 | __func__, ret); | |
777 | return; | |
778 | } else if (!ret) { | |
779 | /* Timeout */ | |
780 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", | |
781 | __func__); | |
782 | } | |
783 | ||
784 | /* Clear power down acknowledment. */ | |
785 | clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
786 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); | |
787 | ||
788 | /* Check if there is something in FIFO. */ | |
789 | if (WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, | |
790 | &fifo_occupancy))) | |
791 | fifo_occupancy = 0; | |
792 | ||
793 | if (fifo_occupancy) { | |
794 | dev_dbg(&cfhsi->ndev->dev, | |
795 | "%s: %u words in RX FIFO, wakeup forced.\n", | |
796 | __func__, (unsigned) fifo_occupancy); | |
797 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
798 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
799 | } else | |
800 | dev_dbg(&cfhsi->ndev->dev, "%s: Done.\n", | |
801 | __func__); | |
802 | } | |
803 | ||
804 | static void cfhsi_wake_up_cb(struct cfhsi_drv *drv) | |
805 | { | |
806 | struct cfhsi *cfhsi = NULL; | |
807 | ||
808 | cfhsi = container_of(drv, struct cfhsi, drv); | |
809 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
810 | __func__); | |
811 | ||
812 | set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
813 | wake_up_interruptible(&cfhsi->wake_up_wait); | |
814 | ||
815 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
816 | return; | |
817 | ||
818 | /* Schedule wake up work queue if the peer initiates. */ | |
819 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
820 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
821 | } | |
822 | ||
823 | static void cfhsi_wake_down_cb(struct cfhsi_drv *drv) | |
824 | { | |
825 | struct cfhsi *cfhsi = NULL; | |
826 | ||
827 | cfhsi = container_of(drv, struct cfhsi, drv); | |
828 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
829 | __func__); | |
830 | ||
831 | /* Initiating low power is only permitted by the host (us). */ | |
832 | set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
833 | wake_up_interruptible(&cfhsi->wake_down_wait); | |
834 | } | |
835 | ||
836 | static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev) | |
837 | { | |
838 | struct cfhsi *cfhsi = NULL; | |
839 | int start_xfer = 0; | |
840 | int timer_active; | |
841 | ||
842 | if (!dev) | |
843 | return -EINVAL; | |
844 | ||
845 | cfhsi = netdev_priv(dev); | |
846 | ||
847 | spin_lock_bh(&cfhsi->lock); | |
848 | ||
849 | skb_queue_tail(&cfhsi->qhead, skb); | |
850 | ||
851 | /* Sanity check; xmit should not be called after unregister_netdev */ | |
852 | if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) { | |
853 | spin_unlock_bh(&cfhsi->lock); | |
854 | cfhsi_abort_tx(cfhsi); | |
855 | return -EINVAL; | |
856 | } | |
857 | ||
858 | /* Send flow off if number of packets is above high water mark. */ | |
859 | if (!cfhsi->flow_off_sent && | |
860 | cfhsi->qhead.qlen > cfhsi->q_high_mark && | |
861 | cfhsi->cfdev.flowctrl) { | |
862 | cfhsi->flow_off_sent = 1; | |
863 | cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF); | |
864 | } | |
865 | ||
866 | if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) { | |
867 | cfhsi->tx_state = CFHSI_TX_STATE_XFER; | |
868 | start_xfer = 1; | |
869 | } | |
870 | ||
73033c98 DT |
871 | if (!start_xfer) { |
872 | spin_unlock_bh(&cfhsi->lock); | |
40d69043 | 873 | return 0; |
73033c98 | 874 | } |
40d69043 DT |
875 | |
876 | /* Delete inactivity timer if started. */ | |
877 | #ifdef CONFIG_SMP | |
878 | timer_active = del_timer_sync(&cfhsi->timer); | |
879 | #else | |
880 | timer_active = del_timer(&cfhsi->timer); | |
881 | #endif /* CONFIG_SMP */ | |
882 | ||
73033c98 DT |
883 | spin_unlock_bh(&cfhsi->lock); |
884 | ||
40d69043 DT |
885 | if (timer_active) { |
886 | struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf; | |
887 | int len; | |
888 | int res; | |
889 | ||
890 | /* Create HSI frame. */ | |
891 | len = cfhsi_tx_frm(desc, cfhsi); | |
892 | BUG_ON(!len); | |
893 | ||
894 | /* Set up new transfer. */ | |
895 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
896 | if (WARN_ON(res < 0)) { | |
897 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
898 | __func__, res); | |
899 | cfhsi_abort_tx(cfhsi); | |
900 | } | |
901 | } else { | |
902 | /* Schedule wake up work queue if the we initiate. */ | |
903 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
904 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
905 | } | |
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
910 | static int cfhsi_open(struct net_device *dev) | |
911 | { | |
912 | netif_wake_queue(dev); | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | static int cfhsi_close(struct net_device *dev) | |
918 | { | |
919 | netif_stop_queue(dev); | |
920 | ||
921 | return 0; | |
922 | } | |
923 | ||
924 | static const struct net_device_ops cfhsi_ops = { | |
925 | .ndo_open = cfhsi_open, | |
926 | .ndo_stop = cfhsi_close, | |
927 | .ndo_start_xmit = cfhsi_xmit | |
928 | }; | |
929 | ||
930 | static void cfhsi_setup(struct net_device *dev) | |
931 | { | |
932 | struct cfhsi *cfhsi = netdev_priv(dev); | |
933 | dev->features = 0; | |
934 | dev->netdev_ops = &cfhsi_ops; | |
935 | dev->type = ARPHRD_CAIF; | |
936 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
937 | dev->mtu = CFHSI_MAX_PAYLOAD_SZ; | |
938 | dev->tx_queue_len = 0; | |
939 | dev->destructor = free_netdev; | |
940 | skb_queue_head_init(&cfhsi->qhead); | |
941 | cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; | |
942 | cfhsi->cfdev.use_frag = false; | |
943 | cfhsi->cfdev.use_stx = false; | |
944 | cfhsi->cfdev.use_fcs = false; | |
945 | cfhsi->ndev = dev; | |
946 | } | |
947 | ||
948 | int cfhsi_probe(struct platform_device *pdev) | |
949 | { | |
950 | struct cfhsi *cfhsi = NULL; | |
951 | struct net_device *ndev; | |
952 | struct cfhsi_dev *dev; | |
953 | int res; | |
954 | ||
955 | ndev = alloc_netdev(sizeof(struct cfhsi), "cfhsi%d", cfhsi_setup); | |
7ac2ed0c | 956 | if (!ndev) |
40d69043 | 957 | return -ENODEV; |
40d69043 DT |
958 | |
959 | cfhsi = netdev_priv(ndev); | |
960 | cfhsi->ndev = ndev; | |
961 | cfhsi->pdev = pdev; | |
962 | ||
963 | /* Initialize state vaiables. */ | |
964 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
965 | cfhsi->rx_state = CFHSI_RX_STATE_DESC; | |
966 | ||
967 | /* Set flow info */ | |
968 | cfhsi->flow_off_sent = 0; | |
969 | cfhsi->q_low_mark = LOW_WATER_MARK; | |
970 | cfhsi->q_high_mark = HIGH_WATER_MARK; | |
971 | ||
972 | /* Assign the HSI device. */ | |
973 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; | |
974 | cfhsi->dev = dev; | |
975 | ||
976 | /* Assign the driver to this HSI device. */ | |
977 | dev->drv = &cfhsi->drv; | |
978 | ||
979 | /* | |
980 | * Allocate a TX buffer with the size of a HSI packet descriptors | |
981 | * and the necessary room for CAIF payload frames. | |
982 | */ | |
983 | cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL); | |
984 | if (!cfhsi->tx_buf) { | |
40d69043 DT |
985 | res = -ENODEV; |
986 | goto err_alloc_tx; | |
987 | } | |
988 | ||
989 | /* | |
990 | * Allocate a RX buffer with the size of two HSI packet descriptors and | |
991 | * the necessary room for CAIF payload frames. | |
992 | */ | |
993 | cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL); | |
994 | if (!cfhsi->rx_buf) { | |
40d69043 DT |
995 | res = -ENODEV; |
996 | goto err_alloc_rx; | |
997 | } | |
998 | ||
864834f9 | 999 | /* Initialize receive variables. */ |
40d69043 DT |
1000 | cfhsi->rx_ptr = cfhsi->rx_buf; |
1001 | cfhsi->rx_len = CFHSI_DESC_SZ; | |
1002 | ||
1003 | /* Initialize spin locks. */ | |
1004 | spin_lock_init(&cfhsi->lock); | |
1005 | ||
1006 | /* Set up the driver. */ | |
1007 | cfhsi->drv.tx_done_cb = cfhsi_tx_done_cb; | |
1008 | cfhsi->drv.rx_done_cb = cfhsi_rx_done_cb; | |
94230feb | 1009 | cfhsi->drv.wake_up_cb = cfhsi_wake_up_cb; |
1010 | cfhsi->drv.wake_down_cb = cfhsi_wake_down_cb; | |
40d69043 DT |
1011 | |
1012 | /* Initialize the work queues. */ | |
1013 | INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up); | |
1014 | INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down); | |
1015 | INIT_WORK(&cfhsi->rx_done_work, cfhsi_rx_done_work); | |
1016 | INIT_WORK(&cfhsi->tx_done_work, cfhsi_tx_done_work); | |
1017 | ||
1018 | /* Clear all bit fields. */ | |
1019 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
1020 | clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
1021 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
1022 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); | |
1023 | clear_bit(CFHSI_PENDING_RX, &cfhsi->bits); | |
1024 | ||
1025 | /* Create work thread. */ | |
1026 | cfhsi->wq = create_singlethread_workqueue(pdev->name); | |
1027 | if (!cfhsi->wq) { | |
1028 | dev_err(&ndev->dev, "%s: Failed to create work queue.\n", | |
1029 | __func__); | |
1030 | res = -ENODEV; | |
1031 | goto err_create_wq; | |
1032 | } | |
1033 | ||
1034 | /* Initialize wait queues. */ | |
1035 | init_waitqueue_head(&cfhsi->wake_up_wait); | |
1036 | init_waitqueue_head(&cfhsi->wake_down_wait); | |
1037 | init_waitqueue_head(&cfhsi->flush_fifo_wait); | |
1038 | ||
1039 | /* Setup the inactivity timer. */ | |
1040 | init_timer(&cfhsi->timer); | |
1041 | cfhsi->timer.data = (unsigned long)cfhsi; | |
1042 | cfhsi->timer.function = cfhsi_inactivity_tout; | |
1043 | ||
1044 | /* Add CAIF HSI device to list. */ | |
1045 | spin_lock(&cfhsi_list_lock); | |
1046 | list_add_tail(&cfhsi->list, &cfhsi_list); | |
1047 | spin_unlock(&cfhsi_list_lock); | |
1048 | ||
1049 | /* Activate HSI interface. */ | |
1050 | res = cfhsi->dev->cfhsi_up(cfhsi->dev); | |
1051 | if (res) { | |
1052 | dev_err(&cfhsi->ndev->dev, | |
1053 | "%s: can't activate HSI interface: %d.\n", | |
1054 | __func__, res); | |
1055 | goto err_activate; | |
1056 | } | |
1057 | ||
1058 | /* Flush FIFO */ | |
1059 | res = cfhsi_flush_fifo(cfhsi); | |
1060 | if (res) { | |
1061 | dev_err(&ndev->dev, "%s: Can't flush FIFO: %d.\n", | |
1062 | __func__, res); | |
1063 | goto err_net_reg; | |
1064 | } | |
1065 | ||
40d69043 DT |
1066 | /* Register network device. */ |
1067 | res = register_netdev(ndev); | |
1068 | if (res) { | |
1069 | dev_err(&ndev->dev, "%s: Registration error: %d.\n", | |
1070 | __func__, res); | |
1071 | goto err_net_reg; | |
1072 | } | |
1073 | ||
1074 | netif_stop_queue(ndev); | |
1075 | ||
1076 | return res; | |
1077 | ||
1078 | err_net_reg: | |
1079 | cfhsi->dev->cfhsi_down(cfhsi->dev); | |
1080 | err_activate: | |
1081 | destroy_workqueue(cfhsi->wq); | |
1082 | err_create_wq: | |
1083 | kfree(cfhsi->rx_buf); | |
1084 | err_alloc_rx: | |
1085 | kfree(cfhsi->tx_buf); | |
1086 | err_alloc_tx: | |
1087 | free_netdev(ndev); | |
1088 | ||
1089 | return res; | |
1090 | } | |
1091 | ||
1092 | static void cfhsi_shutdown(struct cfhsi *cfhsi, bool remove_platform_dev) | |
1093 | { | |
1094 | u8 *tx_buf, *rx_buf; | |
1095 | ||
1096 | /* Stop TXing */ | |
1097 | netif_tx_stop_all_queues(cfhsi->ndev); | |
1098 | ||
1099 | /* going to shutdown driver */ | |
1100 | set_bit(CFHSI_SHUTDOWN, &cfhsi->bits); | |
1101 | ||
1102 | if (remove_platform_dev) { | |
1103 | /* Flush workqueue */ | |
1104 | flush_workqueue(cfhsi->wq); | |
1105 | ||
1106 | /* Notify device. */ | |
1107 | platform_device_unregister(cfhsi->pdev); | |
1108 | } | |
1109 | ||
1110 | /* Flush workqueue */ | |
1111 | flush_workqueue(cfhsi->wq); | |
1112 | ||
1113 | /* Delete timer if pending */ | |
1114 | #ifdef CONFIG_SMP | |
1115 | del_timer_sync(&cfhsi->timer); | |
1116 | #else | |
1117 | del_timer(&cfhsi->timer); | |
1118 | #endif /* CONFIG_SMP */ | |
1119 | ||
1120 | /* Cancel pending RX request (if any) */ | |
1121 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); | |
1122 | ||
1123 | /* Flush again and destroy workqueue */ | |
1124 | destroy_workqueue(cfhsi->wq); | |
1125 | ||
1126 | /* Store bufferes: will be freed later. */ | |
1127 | tx_buf = cfhsi->tx_buf; | |
1128 | rx_buf = cfhsi->rx_buf; | |
1129 | ||
1130 | /* Flush transmit queues. */ | |
1131 | cfhsi_abort_tx(cfhsi); | |
1132 | ||
1133 | /* Deactivate interface */ | |
1134 | cfhsi->dev->cfhsi_down(cfhsi->dev); | |
1135 | ||
1136 | /* Finally unregister the network device. */ | |
1137 | unregister_netdev(cfhsi->ndev); | |
1138 | ||
1139 | /* Free buffers. */ | |
1140 | kfree(tx_buf); | |
1141 | kfree(rx_buf); | |
1142 | } | |
1143 | ||
1144 | int cfhsi_remove(struct platform_device *pdev) | |
1145 | { | |
1146 | struct list_head *list_node; | |
1147 | struct list_head *n; | |
1148 | struct cfhsi *cfhsi = NULL; | |
1149 | struct cfhsi_dev *dev; | |
1150 | ||
1151 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; | |
1152 | spin_lock(&cfhsi_list_lock); | |
1153 | list_for_each_safe(list_node, n, &cfhsi_list) { | |
1154 | cfhsi = list_entry(list_node, struct cfhsi, list); | |
1155 | /* Find the corresponding device. */ | |
1156 | if (cfhsi->dev == dev) { | |
1157 | /* Remove from list. */ | |
1158 | list_del(list_node); | |
1159 | spin_unlock(&cfhsi_list_lock); | |
1160 | ||
1161 | /* Shutdown driver. */ | |
1162 | cfhsi_shutdown(cfhsi, false); | |
1163 | ||
1164 | return 0; | |
1165 | } | |
1166 | } | |
1167 | spin_unlock(&cfhsi_list_lock); | |
1168 | return -ENODEV; | |
1169 | } | |
1170 | ||
1171 | struct platform_driver cfhsi_plat_drv = { | |
1172 | .probe = cfhsi_probe, | |
1173 | .remove = cfhsi_remove, | |
1174 | .driver = { | |
1175 | .name = "cfhsi", | |
1176 | .owner = THIS_MODULE, | |
1177 | }, | |
1178 | }; | |
1179 | ||
1180 | static void __exit cfhsi_exit_module(void) | |
1181 | { | |
1182 | struct list_head *list_node; | |
1183 | struct list_head *n; | |
1184 | struct cfhsi *cfhsi = NULL; | |
1185 | ||
1186 | spin_lock(&cfhsi_list_lock); | |
1187 | list_for_each_safe(list_node, n, &cfhsi_list) { | |
1188 | cfhsi = list_entry(list_node, struct cfhsi, list); | |
1189 | ||
1190 | /* Remove from list. */ | |
1191 | list_del(list_node); | |
1192 | spin_unlock(&cfhsi_list_lock); | |
1193 | ||
1194 | /* Shutdown driver. */ | |
1195 | cfhsi_shutdown(cfhsi, true); | |
1196 | ||
1197 | spin_lock(&cfhsi_list_lock); | |
1198 | } | |
1199 | spin_unlock(&cfhsi_list_lock); | |
1200 | ||
1201 | /* Unregister platform driver. */ | |
1202 | platform_driver_unregister(&cfhsi_plat_drv); | |
1203 | } | |
1204 | ||
1205 | static int __init cfhsi_init_module(void) | |
1206 | { | |
1207 | int result; | |
1208 | ||
1209 | /* Initialize spin lock. */ | |
1210 | spin_lock_init(&cfhsi_list_lock); | |
1211 | ||
1212 | /* Register platform driver. */ | |
1213 | result = platform_driver_register(&cfhsi_plat_drv); | |
1214 | if (result) { | |
1215 | printk(KERN_ERR "Could not register platform HSI driver: %d.\n", | |
1216 | result); | |
1217 | goto err_dev_register; | |
1218 | } | |
1219 | ||
1220 | return result; | |
1221 | ||
1222 | err_dev_register: | |
1223 | return result; | |
1224 | } | |
1225 | ||
1226 | module_init(cfhsi_init_module); | |
1227 | module_exit(cfhsi_exit_module); |