Commit | Line | Data |
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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; | |
687b13e9 | 148 | ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait, |
40d69043 DT |
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 | ||
687b13e9 | 275 | static void cfhsi_tx_done(struct cfhsi *cfhsi) |
40d69043 | 276 | { |
40d69043 DT |
277 | struct cfhsi_desc *desc = NULL; |
278 | int len = 0; | |
279 | int res; | |
280 | ||
687b13e9 | 281 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__); |
40d69043 DT |
282 | |
283 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
284 | return; | |
285 | ||
286 | desc = (struct cfhsi_desc *)cfhsi->tx_buf; | |
287 | ||
288 | do { | |
289 | /* | |
290 | * Send flow on if flow off has been previously signalled | |
291 | * and number of packets is below low water mark. | |
292 | */ | |
293 | spin_lock_bh(&cfhsi->lock); | |
294 | if (cfhsi->flow_off_sent && | |
295 | cfhsi->qhead.qlen <= cfhsi->q_low_mark && | |
296 | cfhsi->cfdev.flowctrl) { | |
297 | ||
298 | cfhsi->flow_off_sent = 0; | |
299 | cfhsi->cfdev.flowctrl(cfhsi->ndev, ON); | |
300 | } | |
301 | spin_unlock_bh(&cfhsi->lock); | |
302 | ||
303 | /* Create HSI frame. */ | |
fe47f125 DT |
304 | do { |
305 | len = cfhsi_tx_frm(desc, cfhsi); | |
306 | if (!len) { | |
307 | spin_lock_bh(&cfhsi->lock); | |
308 | if (unlikely(skb_peek(&cfhsi->qhead))) { | |
309 | spin_unlock_bh(&cfhsi->lock); | |
310 | continue; | |
311 | } | |
312 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
313 | /* Start inactivity timer. */ | |
314 | mod_timer(&cfhsi->timer, | |
40d69043 | 315 | jiffies + CFHSI_INACTIVITY_TOUT); |
fe47f125 DT |
316 | spin_unlock_bh(&cfhsi->lock); |
317 | goto done; | |
318 | } | |
319 | } while (!len); | |
40d69043 DT |
320 | |
321 | /* Set up new transfer. */ | |
322 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
323 | if (WARN_ON(res < 0)) { | |
324 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
325 | __func__, res); | |
326 | } | |
327 | } while (res < 0); | |
fe47f125 DT |
328 | |
329 | done: | |
330 | return; | |
40d69043 DT |
331 | } |
332 | ||
333 | static void cfhsi_tx_done_cb(struct cfhsi_drv *drv) | |
334 | { | |
335 | struct cfhsi *cfhsi; | |
336 | ||
337 | cfhsi = container_of(drv, struct cfhsi, drv); | |
338 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
339 | __func__); | |
340 | ||
341 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
342 | return; | |
687b13e9 | 343 | cfhsi_tx_done(cfhsi); |
40d69043 DT |
344 | } |
345 | ||
687b13e9 DM |
346 | static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi, |
347 | bool *dump) | |
40d69043 DT |
348 | { |
349 | int xfer_sz = 0; | |
350 | int nfrms = 0; | |
351 | u16 *plen = NULL; | |
352 | u8 *pfrm = NULL; | |
353 | ||
354 | if ((desc->header & ~CFHSI_PIGGY_DESC) || | |
355 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) { | |
356 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", | |
357 | __func__); | |
687b13e9 | 358 | *dump = true; |
40d69043 DT |
359 | return 0; |
360 | } | |
361 | ||
362 | /* Check for embedded CAIF frame. */ | |
363 | if (desc->offset) { | |
364 | struct sk_buff *skb; | |
365 | u8 *dst = NULL; | |
687b13e9 | 366 | int len = 0; |
40d69043 DT |
367 | pfrm = ((u8 *)desc) + desc->offset; |
368 | ||
369 | /* Remove offset padding. */ | |
370 | pfrm += *pfrm + 1; | |
371 | ||
372 | /* Read length of CAIF frame (little endian). */ | |
373 | len = *pfrm; | |
374 | len |= ((*(pfrm+1)) << 8) & 0xFF00; | |
375 | len += 2; /* Add FCS fields. */ | |
376 | ||
377 | ||
378 | /* Allocate SKB (OK even in IRQ context). */ | |
687b13e9 DM |
379 | skb = alloc_skb(len + 1, GFP_ATOMIC); |
380 | if (!skb) { | |
381 | dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n", | |
382 | __func__); | |
383 | return -ENOMEM; | |
40d69043 DT |
384 | } |
385 | caif_assert(skb != NULL); | |
386 | ||
387 | dst = skb_put(skb, len); | |
388 | memcpy(dst, pfrm, len); | |
389 | ||
390 | skb->protocol = htons(ETH_P_CAIF); | |
391 | skb_reset_mac_header(skb); | |
392 | skb->dev = cfhsi->ndev; | |
393 | ||
394 | /* | |
395 | * We are called from a arch specific platform device. | |
396 | * Unfortunately we don't know what context we're | |
397 | * running in. | |
398 | */ | |
399 | if (in_interrupt()) | |
400 | netif_rx(skb); | |
401 | else | |
402 | netif_rx_ni(skb); | |
403 | ||
404 | /* Update network statistics. */ | |
405 | cfhsi->ndev->stats.rx_packets++; | |
406 | cfhsi->ndev->stats.rx_bytes += len; | |
407 | } | |
408 | ||
40d69043 DT |
409 | /* Calculate transfer length. */ |
410 | plen = desc->cffrm_len; | |
411 | while (nfrms < CFHSI_MAX_PKTS && *plen) { | |
412 | xfer_sz += *plen; | |
413 | plen++; | |
414 | nfrms++; | |
415 | } | |
416 | ||
417 | /* Check for piggy-backed descriptor. */ | |
418 | if (desc->header & CFHSI_PIGGY_DESC) | |
419 | xfer_sz += CFHSI_DESC_SZ; | |
420 | ||
421 | if (xfer_sz % 4) { | |
422 | dev_err(&cfhsi->ndev->dev, | |
423 | "%s: Invalid payload len: %d, ignored.\n", | |
424 | __func__, xfer_sz); | |
425 | xfer_sz = 0; | |
687b13e9 | 426 | *dump = true; |
40d69043 | 427 | } |
40d69043 DT |
428 | return xfer_sz; |
429 | } | |
430 | ||
687b13e9 DM |
431 | static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi, |
432 | bool *dump) | |
40d69043 DT |
433 | { |
434 | int rx_sz = 0; | |
435 | int nfrms = 0; | |
436 | u16 *plen = NULL; | |
437 | u8 *pfrm = NULL; | |
438 | ||
439 | /* Sanity check header and offset. */ | |
440 | if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) || | |
441 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ))) { | |
442 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", | |
443 | __func__); | |
687b13e9 | 444 | *dump = true; |
40d69043 DT |
445 | return -EINVAL; |
446 | } | |
447 | ||
448 | /* Set frame pointer to start of payload. */ | |
449 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; | |
450 | plen = desc->cffrm_len; | |
687b13e9 DM |
451 | |
452 | /* Skip already processed frames. */ | |
453 | while (nfrms < cfhsi->rx_state.nfrms) { | |
454 | pfrm += *plen; | |
455 | rx_sz += *plen; | |
456 | plen++; | |
457 | nfrms++; | |
458 | } | |
459 | ||
460 | /* Parse payload. */ | |
40d69043 DT |
461 | while (nfrms < CFHSI_MAX_PKTS && *plen) { |
462 | struct sk_buff *skb; | |
463 | u8 *dst = NULL; | |
464 | u8 *pcffrm = NULL; | |
687b13e9 | 465 | int len = 0; |
40d69043 DT |
466 | |
467 | if (WARN_ON(desc->cffrm_len[nfrms] > CFHSI_MAX_PAYLOAD_SZ)) { | |
468 | dev_err(&cfhsi->ndev->dev, "%s: Invalid payload.\n", | |
469 | __func__); | |
687b13e9 | 470 | *dump = true; |
40d69043 DT |
471 | return -EINVAL; |
472 | } | |
473 | ||
474 | /* CAIF frame starts after head padding. */ | |
475 | pcffrm = pfrm + *pfrm + 1; | |
476 | ||
477 | /* Read length of CAIF frame (little endian). */ | |
478 | len = *pcffrm; | |
479 | len |= ((*(pcffrm + 1)) << 8) & 0xFF00; | |
480 | len += 2; /* Add FCS fields. */ | |
481 | ||
482 | /* Allocate SKB (OK even in IRQ context). */ | |
687b13e9 DM |
483 | skb = alloc_skb(len + 1, GFP_ATOMIC); |
484 | if (!skb) { | |
485 | dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n", | |
486 | __func__); | |
487 | cfhsi->rx_state.nfrms = nfrms; | |
488 | return -ENOMEM; | |
40d69043 DT |
489 | } |
490 | caif_assert(skb != NULL); | |
491 | ||
492 | dst = skb_put(skb, len); | |
493 | memcpy(dst, pcffrm, len); | |
494 | ||
495 | skb->protocol = htons(ETH_P_CAIF); | |
496 | skb_reset_mac_header(skb); | |
497 | skb->dev = cfhsi->ndev; | |
498 | ||
499 | /* | |
500 | * We're called from a platform device, | |
501 | * and don't know the context we're running in. | |
502 | */ | |
503 | if (in_interrupt()) | |
504 | netif_rx(skb); | |
505 | else | |
506 | netif_rx_ni(skb); | |
507 | ||
508 | /* Update network statistics. */ | |
509 | cfhsi->ndev->stats.rx_packets++; | |
510 | cfhsi->ndev->stats.rx_bytes += len; | |
511 | ||
40d69043 DT |
512 | pfrm += *plen; |
513 | rx_sz += *plen; | |
514 | plen++; | |
515 | nfrms++; | |
516 | } | |
517 | ||
518 | return rx_sz; | |
519 | } | |
520 | ||
687b13e9 | 521 | static void cfhsi_rx_done(struct cfhsi *cfhsi) |
40d69043 DT |
522 | { |
523 | int res; | |
524 | int desc_pld_len = 0; | |
40d69043 | 525 | struct cfhsi_desc *desc = NULL; |
687b13e9 | 526 | bool dump = false; |
40d69043 | 527 | |
40d69043 DT |
528 | desc = (struct cfhsi_desc *)cfhsi->rx_buf; |
529 | ||
687b13e9 | 530 | dev_dbg(&cfhsi->ndev->dev, "%s\n", __func__); |
40d69043 DT |
531 | |
532 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
533 | return; | |
534 | ||
535 | /* Update inactivity timer if pending. */ | |
73033c98 | 536 | spin_lock_bh(&cfhsi->lock); |
40d69043 | 537 | mod_timer_pending(&cfhsi->timer, jiffies + CFHSI_INACTIVITY_TOUT); |
73033c98 | 538 | spin_unlock_bh(&cfhsi->lock); |
40d69043 | 539 | |
687b13e9 DM |
540 | if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) { |
541 | desc_pld_len = cfhsi_rx_desc(desc, cfhsi, &dump); | |
542 | if (desc_pld_len == -ENOMEM) | |
543 | goto restart; | |
40d69043 DT |
544 | } else { |
545 | int pld_len; | |
546 | ||
687b13e9 DM |
547 | if (!cfhsi->rx_state.piggy_desc) { |
548 | pld_len = cfhsi_rx_pld(desc, cfhsi, &dump); | |
549 | if (pld_len == -ENOMEM) | |
550 | goto restart; | |
551 | cfhsi->rx_state.pld_len = pld_len; | |
552 | } else { | |
553 | pld_len = cfhsi->rx_state.pld_len; | |
554 | } | |
40d69043 DT |
555 | |
556 | if ((pld_len > 0) && (desc->header & CFHSI_PIGGY_DESC)) { | |
557 | struct cfhsi_desc *piggy_desc; | |
558 | piggy_desc = (struct cfhsi_desc *) | |
559 | (desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ + | |
560 | pld_len); | |
687b13e9 | 561 | cfhsi->rx_state.piggy_desc = true; |
40d69043 DT |
562 | |
563 | /* Extract piggy-backed descriptor. */ | |
687b13e9 DM |
564 | desc_pld_len = cfhsi_rx_desc(piggy_desc, cfhsi, &dump); |
565 | if (desc_pld_len == -ENOMEM) | |
566 | goto restart; | |
40d69043 DT |
567 | |
568 | /* | |
569 | * Copy needed information from the piggy-backed | |
570 | * descriptor to the descriptor in the start. | |
571 | */ | |
572 | memcpy((u8 *)desc, (u8 *)piggy_desc, | |
573 | CFHSI_DESC_SHORT_SZ); | |
574 | } | |
575 | } | |
576 | ||
687b13e9 DM |
577 | if (unlikely(dump)) { |
578 | size_t rx_offset = cfhsi->rx_ptr - cfhsi->rx_buf; | |
579 | dev_err(&cfhsi->ndev->dev, "%s: RX offset: %u.\n", | |
580 | __func__, (unsigned) rx_offset); | |
581 | print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE, | |
582 | cfhsi->rx_buf, cfhsi->rx_len + rx_offset); | |
583 | } | |
584 | ||
585 | memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state)); | |
40d69043 | 586 | if (desc_pld_len) { |
687b13e9 | 587 | cfhsi->rx_state.state = CFHSI_RX_STATE_PAYLOAD; |
40d69043 DT |
588 | cfhsi->rx_ptr = cfhsi->rx_buf + CFHSI_DESC_SZ; |
589 | cfhsi->rx_len = desc_pld_len; | |
590 | } else { | |
687b13e9 | 591 | cfhsi->rx_state.state = CFHSI_RX_STATE_DESC; |
40d69043 DT |
592 | cfhsi->rx_ptr = cfhsi->rx_buf; |
593 | cfhsi->rx_len = CFHSI_DESC_SZ; | |
594 | } | |
40d69043 DT |
595 | |
596 | if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) { | |
597 | /* Set up new transfer. */ | |
598 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", | |
599 | __func__); | |
600 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, | |
601 | cfhsi->dev); | |
602 | if (WARN_ON(res < 0)) { | |
603 | dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n", | |
604 | __func__, res); | |
605 | cfhsi->ndev->stats.rx_errors++; | |
606 | cfhsi->ndev->stats.rx_dropped++; | |
607 | } | |
608 | } | |
687b13e9 DM |
609 | return; |
610 | ||
611 | restart: | |
612 | if (++cfhsi->rx_state.retries > CFHSI_MAX_RX_RETRIES) { | |
613 | dev_err(&cfhsi->ndev->dev, "%s: No memory available " | |
614 | "in %d iterations.\n", | |
615 | __func__, CFHSI_MAX_RX_RETRIES); | |
616 | BUG(); | |
617 | } | |
618 | mod_timer(&cfhsi->rx_slowpath_timer, jiffies + 1); | |
619 | } | |
620 | ||
621 | static void cfhsi_rx_slowpath(unsigned long arg) | |
622 | { | |
623 | struct cfhsi *cfhsi = (struct cfhsi *)arg; | |
624 | ||
625 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
626 | __func__); | |
627 | ||
628 | cfhsi_rx_done(cfhsi); | |
40d69043 DT |
629 | } |
630 | ||
631 | static void cfhsi_rx_done_cb(struct cfhsi_drv *drv) | |
632 | { | |
633 | struct cfhsi *cfhsi; | |
634 | ||
635 | cfhsi = container_of(drv, struct cfhsi, drv); | |
636 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
637 | __func__); | |
638 | ||
639 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
640 | return; | |
641 | ||
40d69043 DT |
642 | if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits)) |
643 | wake_up_interruptible(&cfhsi->flush_fifo_wait); | |
644 | else | |
687b13e9 | 645 | cfhsi_rx_done(cfhsi); |
40d69043 DT |
646 | } |
647 | ||
648 | static void cfhsi_wake_up(struct work_struct *work) | |
649 | { | |
650 | struct cfhsi *cfhsi = NULL; | |
651 | int res; | |
652 | int len; | |
653 | long ret; | |
654 | ||
655 | cfhsi = container_of(work, struct cfhsi, wake_up_work); | |
656 | ||
657 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
658 | return; | |
659 | ||
660 | if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) { | |
661 | /* It happenes when wakeup is requested by | |
662 | * both ends at the same time. */ | |
663 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
664 | return; | |
665 | } | |
666 | ||
667 | /* Activate wake line. */ | |
668 | cfhsi->dev->cfhsi_wake_up(cfhsi->dev); | |
669 | ||
670 | dev_dbg(&cfhsi->ndev->dev, "%s: Start waiting.\n", | |
671 | __func__); | |
672 | ||
673 | /* Wait for acknowledge. */ | |
687b13e9 DM |
674 | ret = CFHSI_WAKE_TOUT; |
675 | ret = wait_event_interruptible_timeout(cfhsi->wake_up_wait, | |
676 | test_and_clear_bit(CFHSI_WAKE_UP_ACK, | |
40d69043 DT |
677 | &cfhsi->bits), ret); |
678 | if (unlikely(ret < 0)) { | |
679 | /* Interrupted by signal. */ | |
680 | dev_info(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", | |
681 | __func__, ret); | |
682 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
683 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
684 | return; | |
685 | } else if (!ret) { | |
686 | /* Wakeup timeout */ | |
687 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", | |
688 | __func__); | |
689 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
690 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
691 | return; | |
692 | } | |
693 | dev_dbg(&cfhsi->ndev->dev, "%s: Woken.\n", | |
694 | __func__); | |
695 | ||
696 | /* Clear power up bit. */ | |
697 | set_bit(CFHSI_AWAKE, &cfhsi->bits); | |
698 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
699 | ||
700 | /* Resume read operation. */ | |
687b13e9 DM |
701 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", __func__); |
702 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, cfhsi->dev); | |
703 | ||
704 | if (WARN_ON(res < 0)) | |
705 | dev_err(&cfhsi->ndev->dev, "%s: RX err %d.\n", __func__, res); | |
40d69043 DT |
706 | |
707 | /* Clear power up acknowledment. */ | |
708 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
709 | ||
710 | spin_lock_bh(&cfhsi->lock); | |
711 | ||
712 | /* Resume transmit if queue is not empty. */ | |
713 | if (!skb_peek(&cfhsi->qhead)) { | |
714 | dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n", | |
715 | __func__); | |
716 | /* Start inactivity timer. */ | |
717 | mod_timer(&cfhsi->timer, | |
718 | jiffies + CFHSI_INACTIVITY_TOUT); | |
719 | spin_unlock_bh(&cfhsi->lock); | |
720 | return; | |
721 | } | |
722 | ||
723 | dev_dbg(&cfhsi->ndev->dev, "%s: Host wake.\n", | |
724 | __func__); | |
725 | ||
726 | spin_unlock_bh(&cfhsi->lock); | |
727 | ||
728 | /* Create HSI frame. */ | |
729 | len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi); | |
730 | ||
731 | if (likely(len > 0)) { | |
732 | /* Set up new transfer. */ | |
733 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
734 | if (WARN_ON(res < 0)) { | |
735 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
736 | __func__, res); | |
737 | cfhsi_abort_tx(cfhsi); | |
738 | } | |
739 | } else { | |
740 | dev_err(&cfhsi->ndev->dev, | |
741 | "%s: Failed to create HSI frame: %d.\n", | |
742 | __func__, len); | |
743 | } | |
40d69043 DT |
744 | } |
745 | ||
746 | static void cfhsi_wake_down(struct work_struct *work) | |
747 | { | |
748 | long ret; | |
749 | struct cfhsi *cfhsi = NULL; | |
687b13e9 DM |
750 | size_t fifo_occupancy = 0; |
751 | int retry = CFHSI_WAKE_TOUT; | |
40d69043 DT |
752 | |
753 | cfhsi = container_of(work, struct cfhsi, wake_down_work); | |
687b13e9 | 754 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__); |
40d69043 DT |
755 | |
756 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
757 | return; | |
758 | ||
40d69043 DT |
759 | /* Deactivate wake line. */ |
760 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
761 | ||
762 | /* Wait for acknowledge. */ | |
687b13e9 | 763 | ret = CFHSI_WAKE_TOUT; |
40d69043 | 764 | ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait, |
687b13e9 DM |
765 | test_and_clear_bit(CFHSI_WAKE_DOWN_ACK, |
766 | &cfhsi->bits), ret); | |
40d69043 DT |
767 | if (ret < 0) { |
768 | /* Interrupted by signal. */ | |
769 | dev_info(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", | |
770 | __func__, ret); | |
771 | return; | |
772 | } else if (!ret) { | |
773 | /* Timeout */ | |
687b13e9 | 774 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", __func__); |
40d69043 DT |
775 | } |
776 | ||
687b13e9 DM |
777 | /* Check FIFO occupancy. */ |
778 | while (retry) { | |
779 | WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, | |
780 | &fifo_occupancy)); | |
781 | ||
782 | if (!fifo_occupancy) | |
783 | break; | |
784 | ||
785 | set_current_state(TASK_INTERRUPTIBLE); | |
786 | schedule_timeout(1); | |
787 | retry--; | |
788 | } | |
789 | ||
790 | if (!retry) | |
791 | dev_err(&cfhsi->ndev->dev, "%s: FIFO Timeout.\n", __func__); | |
792 | ||
793 | /* Clear AWAKE condition. */ | |
40d69043 DT |
794 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); |
795 | ||
687b13e9 DM |
796 | /* Cancel pending RX requests. */ |
797 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); | |
40d69043 | 798 | |
40d69043 DT |
799 | } |
800 | ||
801 | static void cfhsi_wake_up_cb(struct cfhsi_drv *drv) | |
802 | { | |
803 | struct cfhsi *cfhsi = NULL; | |
804 | ||
805 | cfhsi = container_of(drv, struct cfhsi, drv); | |
806 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
807 | __func__); | |
808 | ||
809 | set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
810 | wake_up_interruptible(&cfhsi->wake_up_wait); | |
811 | ||
812 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
813 | return; | |
814 | ||
815 | /* Schedule wake up work queue if the peer initiates. */ | |
816 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
817 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
818 | } | |
819 | ||
820 | static void cfhsi_wake_down_cb(struct cfhsi_drv *drv) | |
821 | { | |
822 | struct cfhsi *cfhsi = NULL; | |
823 | ||
824 | cfhsi = container_of(drv, struct cfhsi, drv); | |
825 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
826 | __func__); | |
827 | ||
828 | /* Initiating low power is only permitted by the host (us). */ | |
829 | set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
830 | wake_up_interruptible(&cfhsi->wake_down_wait); | |
831 | } | |
832 | ||
833 | static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev) | |
834 | { | |
835 | struct cfhsi *cfhsi = NULL; | |
836 | int start_xfer = 0; | |
837 | int timer_active; | |
838 | ||
839 | if (!dev) | |
840 | return -EINVAL; | |
841 | ||
842 | cfhsi = netdev_priv(dev); | |
843 | ||
844 | spin_lock_bh(&cfhsi->lock); | |
845 | ||
846 | skb_queue_tail(&cfhsi->qhead, skb); | |
847 | ||
848 | /* Sanity check; xmit should not be called after unregister_netdev */ | |
849 | if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) { | |
850 | spin_unlock_bh(&cfhsi->lock); | |
851 | cfhsi_abort_tx(cfhsi); | |
852 | return -EINVAL; | |
853 | } | |
854 | ||
855 | /* Send flow off if number of packets is above high water mark. */ | |
856 | if (!cfhsi->flow_off_sent && | |
857 | cfhsi->qhead.qlen > cfhsi->q_high_mark && | |
858 | cfhsi->cfdev.flowctrl) { | |
859 | cfhsi->flow_off_sent = 1; | |
860 | cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF); | |
861 | } | |
862 | ||
863 | if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) { | |
864 | cfhsi->tx_state = CFHSI_TX_STATE_XFER; | |
865 | start_xfer = 1; | |
866 | } | |
867 | ||
73033c98 DT |
868 | if (!start_xfer) { |
869 | spin_unlock_bh(&cfhsi->lock); | |
40d69043 | 870 | return 0; |
73033c98 | 871 | } |
40d69043 DT |
872 | |
873 | /* Delete inactivity timer if started. */ | |
40d69043 | 874 | timer_active = del_timer_sync(&cfhsi->timer); |
40d69043 | 875 | |
73033c98 DT |
876 | spin_unlock_bh(&cfhsi->lock); |
877 | ||
40d69043 DT |
878 | if (timer_active) { |
879 | struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf; | |
880 | int len; | |
881 | int res; | |
882 | ||
883 | /* Create HSI frame. */ | |
884 | len = cfhsi_tx_frm(desc, cfhsi); | |
885 | BUG_ON(!len); | |
886 | ||
887 | /* Set up new transfer. */ | |
888 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
889 | if (WARN_ON(res < 0)) { | |
890 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
891 | __func__, res); | |
892 | cfhsi_abort_tx(cfhsi); | |
893 | } | |
894 | } else { | |
895 | /* Schedule wake up work queue if the we initiate. */ | |
896 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
897 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
898 | } | |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
903 | static int cfhsi_open(struct net_device *dev) | |
904 | { | |
905 | netif_wake_queue(dev); | |
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
910 | static int cfhsi_close(struct net_device *dev) | |
911 | { | |
912 | netif_stop_queue(dev); | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | static const struct net_device_ops cfhsi_ops = { | |
918 | .ndo_open = cfhsi_open, | |
919 | .ndo_stop = cfhsi_close, | |
920 | .ndo_start_xmit = cfhsi_xmit | |
921 | }; | |
922 | ||
923 | static void cfhsi_setup(struct net_device *dev) | |
924 | { | |
925 | struct cfhsi *cfhsi = netdev_priv(dev); | |
926 | dev->features = 0; | |
927 | dev->netdev_ops = &cfhsi_ops; | |
928 | dev->type = ARPHRD_CAIF; | |
929 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
930 | dev->mtu = CFHSI_MAX_PAYLOAD_SZ; | |
931 | dev->tx_queue_len = 0; | |
932 | dev->destructor = free_netdev; | |
933 | skb_queue_head_init(&cfhsi->qhead); | |
934 | cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; | |
935 | cfhsi->cfdev.use_frag = false; | |
936 | cfhsi->cfdev.use_stx = false; | |
937 | cfhsi->cfdev.use_fcs = false; | |
938 | cfhsi->ndev = dev; | |
939 | } | |
940 | ||
941 | int cfhsi_probe(struct platform_device *pdev) | |
942 | { | |
943 | struct cfhsi *cfhsi = NULL; | |
944 | struct net_device *ndev; | |
945 | struct cfhsi_dev *dev; | |
946 | int res; | |
947 | ||
948 | ndev = alloc_netdev(sizeof(struct cfhsi), "cfhsi%d", cfhsi_setup); | |
7ac2ed0c | 949 | if (!ndev) |
40d69043 | 950 | return -ENODEV; |
40d69043 DT |
951 | |
952 | cfhsi = netdev_priv(ndev); | |
953 | cfhsi->ndev = ndev; | |
954 | cfhsi->pdev = pdev; | |
955 | ||
956 | /* Initialize state vaiables. */ | |
957 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
687b13e9 | 958 | cfhsi->rx_state.state = CFHSI_RX_STATE_DESC; |
40d69043 DT |
959 | |
960 | /* Set flow info */ | |
961 | cfhsi->flow_off_sent = 0; | |
962 | cfhsi->q_low_mark = LOW_WATER_MARK; | |
963 | cfhsi->q_high_mark = HIGH_WATER_MARK; | |
964 | ||
965 | /* Assign the HSI device. */ | |
966 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; | |
967 | cfhsi->dev = dev; | |
968 | ||
969 | /* Assign the driver to this HSI device. */ | |
970 | dev->drv = &cfhsi->drv; | |
971 | ||
972 | /* | |
973 | * Allocate a TX buffer with the size of a HSI packet descriptors | |
974 | * and the necessary room for CAIF payload frames. | |
975 | */ | |
976 | cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL); | |
977 | if (!cfhsi->tx_buf) { | |
40d69043 DT |
978 | res = -ENODEV; |
979 | goto err_alloc_tx; | |
980 | } | |
981 | ||
982 | /* | |
983 | * Allocate a RX buffer with the size of two HSI packet descriptors and | |
984 | * the necessary room for CAIF payload frames. | |
985 | */ | |
986 | cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL); | |
987 | if (!cfhsi->rx_buf) { | |
40d69043 DT |
988 | res = -ENODEV; |
989 | goto err_alloc_rx; | |
990 | } | |
991 | ||
864834f9 | 992 | /* Initialize receive variables. */ |
40d69043 DT |
993 | cfhsi->rx_ptr = cfhsi->rx_buf; |
994 | cfhsi->rx_len = CFHSI_DESC_SZ; | |
995 | ||
996 | /* Initialize spin locks. */ | |
997 | spin_lock_init(&cfhsi->lock); | |
998 | ||
999 | /* Set up the driver. */ | |
1000 | cfhsi->drv.tx_done_cb = cfhsi_tx_done_cb; | |
1001 | cfhsi->drv.rx_done_cb = cfhsi_rx_done_cb; | |
94230feb | 1002 | cfhsi->drv.wake_up_cb = cfhsi_wake_up_cb; |
1003 | cfhsi->drv.wake_down_cb = cfhsi_wake_down_cb; | |
40d69043 DT |
1004 | |
1005 | /* Initialize the work queues. */ | |
1006 | INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up); | |
1007 | INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down); | |
40d69043 DT |
1008 | |
1009 | /* Clear all bit fields. */ | |
1010 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
1011 | clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
1012 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
1013 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); | |
40d69043 DT |
1014 | |
1015 | /* Create work thread. */ | |
1016 | cfhsi->wq = create_singlethread_workqueue(pdev->name); | |
1017 | if (!cfhsi->wq) { | |
1018 | dev_err(&ndev->dev, "%s: Failed to create work queue.\n", | |
1019 | __func__); | |
1020 | res = -ENODEV; | |
1021 | goto err_create_wq; | |
1022 | } | |
1023 | ||
1024 | /* Initialize wait queues. */ | |
1025 | init_waitqueue_head(&cfhsi->wake_up_wait); | |
1026 | init_waitqueue_head(&cfhsi->wake_down_wait); | |
1027 | init_waitqueue_head(&cfhsi->flush_fifo_wait); | |
1028 | ||
1029 | /* Setup the inactivity timer. */ | |
1030 | init_timer(&cfhsi->timer); | |
1031 | cfhsi->timer.data = (unsigned long)cfhsi; | |
1032 | cfhsi->timer.function = cfhsi_inactivity_tout; | |
687b13e9 DM |
1033 | /* Setup the slowpath RX timer. */ |
1034 | init_timer(&cfhsi->rx_slowpath_timer); | |
1035 | cfhsi->rx_slowpath_timer.data = (unsigned long)cfhsi; | |
1036 | cfhsi->rx_slowpath_timer.function = cfhsi_rx_slowpath; | |
40d69043 DT |
1037 | |
1038 | /* Add CAIF HSI device to list. */ | |
1039 | spin_lock(&cfhsi_list_lock); | |
1040 | list_add_tail(&cfhsi->list, &cfhsi_list); | |
1041 | spin_unlock(&cfhsi_list_lock); | |
1042 | ||
1043 | /* Activate HSI interface. */ | |
1044 | res = cfhsi->dev->cfhsi_up(cfhsi->dev); | |
1045 | if (res) { | |
1046 | dev_err(&cfhsi->ndev->dev, | |
1047 | "%s: can't activate HSI interface: %d.\n", | |
1048 | __func__, res); | |
1049 | goto err_activate; | |
1050 | } | |
1051 | ||
1052 | /* Flush FIFO */ | |
1053 | res = cfhsi_flush_fifo(cfhsi); | |
1054 | if (res) { | |
1055 | dev_err(&ndev->dev, "%s: Can't flush FIFO: %d.\n", | |
1056 | __func__, res); | |
1057 | goto err_net_reg; | |
1058 | } | |
1059 | ||
40d69043 DT |
1060 | /* Register network device. */ |
1061 | res = register_netdev(ndev); | |
1062 | if (res) { | |
1063 | dev_err(&ndev->dev, "%s: Registration error: %d.\n", | |
1064 | __func__, res); | |
1065 | goto err_net_reg; | |
1066 | } | |
1067 | ||
1068 | netif_stop_queue(ndev); | |
1069 | ||
1070 | return res; | |
1071 | ||
1072 | err_net_reg: | |
1073 | cfhsi->dev->cfhsi_down(cfhsi->dev); | |
1074 | err_activate: | |
1075 | destroy_workqueue(cfhsi->wq); | |
1076 | err_create_wq: | |
1077 | kfree(cfhsi->rx_buf); | |
1078 | err_alloc_rx: | |
1079 | kfree(cfhsi->tx_buf); | |
1080 | err_alloc_tx: | |
1081 | free_netdev(ndev); | |
1082 | ||
1083 | return res; | |
1084 | } | |
1085 | ||
ca63f8c7 | 1086 | static void cfhsi_shutdown(struct cfhsi *cfhsi) |
40d69043 DT |
1087 | { |
1088 | u8 *tx_buf, *rx_buf; | |
1089 | ||
1090 | /* Stop TXing */ | |
1091 | netif_tx_stop_all_queues(cfhsi->ndev); | |
1092 | ||
1093 | /* going to shutdown driver */ | |
1094 | set_bit(CFHSI_SHUTDOWN, &cfhsi->bits); | |
1095 | ||
40d69043 DT |
1096 | /* Flush workqueue */ |
1097 | flush_workqueue(cfhsi->wq); | |
1098 | ||
687b13e9 | 1099 | /* Delete timers if pending */ |
40d69043 | 1100 | del_timer_sync(&cfhsi->timer); |
687b13e9 | 1101 | del_timer_sync(&cfhsi->rx_slowpath_timer); |
40d69043 DT |
1102 | |
1103 | /* Cancel pending RX request (if any) */ | |
1104 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); | |
1105 | ||
ca63f8c7 | 1106 | /* Destroy workqueue */ |
40d69043 DT |
1107 | destroy_workqueue(cfhsi->wq); |
1108 | ||
1109 | /* Store bufferes: will be freed later. */ | |
1110 | tx_buf = cfhsi->tx_buf; | |
1111 | rx_buf = cfhsi->rx_buf; | |
1112 | ||
1113 | /* Flush transmit queues. */ | |
1114 | cfhsi_abort_tx(cfhsi); | |
1115 | ||
1116 | /* Deactivate interface */ | |
1117 | cfhsi->dev->cfhsi_down(cfhsi->dev); | |
1118 | ||
1119 | /* Finally unregister the network device. */ | |
1120 | unregister_netdev(cfhsi->ndev); | |
1121 | ||
1122 | /* Free buffers. */ | |
1123 | kfree(tx_buf); | |
1124 | kfree(rx_buf); | |
1125 | } | |
1126 | ||
1127 | int cfhsi_remove(struct platform_device *pdev) | |
1128 | { | |
1129 | struct list_head *list_node; | |
1130 | struct list_head *n; | |
1131 | struct cfhsi *cfhsi = NULL; | |
1132 | struct cfhsi_dev *dev; | |
1133 | ||
1134 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; | |
1135 | spin_lock(&cfhsi_list_lock); | |
1136 | list_for_each_safe(list_node, n, &cfhsi_list) { | |
1137 | cfhsi = list_entry(list_node, struct cfhsi, list); | |
1138 | /* Find the corresponding device. */ | |
1139 | if (cfhsi->dev == dev) { | |
1140 | /* Remove from list. */ | |
1141 | list_del(list_node); | |
1142 | spin_unlock(&cfhsi_list_lock); | |
1143 | ||
1144 | /* Shutdown driver. */ | |
ca63f8c7 | 1145 | cfhsi_shutdown(cfhsi); |
40d69043 DT |
1146 | |
1147 | return 0; | |
1148 | } | |
1149 | } | |
1150 | spin_unlock(&cfhsi_list_lock); | |
1151 | return -ENODEV; | |
1152 | } | |
1153 | ||
1154 | struct platform_driver cfhsi_plat_drv = { | |
1155 | .probe = cfhsi_probe, | |
1156 | .remove = cfhsi_remove, | |
1157 | .driver = { | |
1158 | .name = "cfhsi", | |
1159 | .owner = THIS_MODULE, | |
1160 | }, | |
1161 | }; | |
1162 | ||
1163 | static void __exit cfhsi_exit_module(void) | |
1164 | { | |
1165 | struct list_head *list_node; | |
1166 | struct list_head *n; | |
1167 | struct cfhsi *cfhsi = NULL; | |
1168 | ||
1169 | spin_lock(&cfhsi_list_lock); | |
1170 | list_for_each_safe(list_node, n, &cfhsi_list) { | |
1171 | cfhsi = list_entry(list_node, struct cfhsi, list); | |
1172 | ||
1173 | /* Remove from list. */ | |
1174 | list_del(list_node); | |
1175 | spin_unlock(&cfhsi_list_lock); | |
1176 | ||
1177 | /* Shutdown driver. */ | |
ca63f8c7 | 1178 | cfhsi_shutdown(cfhsi); |
40d69043 DT |
1179 | |
1180 | spin_lock(&cfhsi_list_lock); | |
1181 | } | |
1182 | spin_unlock(&cfhsi_list_lock); | |
1183 | ||
1184 | /* Unregister platform driver. */ | |
1185 | platform_driver_unregister(&cfhsi_plat_drv); | |
1186 | } | |
1187 | ||
1188 | static int __init cfhsi_init_module(void) | |
1189 | { | |
1190 | int result; | |
1191 | ||
1192 | /* Initialize spin lock. */ | |
1193 | spin_lock_init(&cfhsi_list_lock); | |
1194 | ||
1195 | /* Register platform driver. */ | |
1196 | result = platform_driver_register(&cfhsi_plat_drv); | |
1197 | if (result) { | |
1198 | printk(KERN_ERR "Could not register platform HSI driver: %d.\n", | |
1199 | result); | |
1200 | goto err_dev_register; | |
1201 | } | |
1202 | ||
1203 | return result; | |
1204 | ||
1205 | err_dev_register: | |
1206 | return result; | |
1207 | } | |
1208 | ||
1209 | module_init(cfhsi_init_module); | |
1210 | module_exit(cfhsi_exit_module); |