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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> | |
5bbed92d | 21 | #include <linux/rtnetlink.h> |
40d69043 DT |
22 | #include <net/caif/caif_layer.h> |
23 | #include <net/caif/caif_hsi.h> | |
24 | ||
25 | MODULE_LICENSE("GPL"); | |
26 | MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>"); | |
27 | MODULE_DESCRIPTION("CAIF HSI driver"); | |
28 | ||
29 | /* Returns the number of padding bytes for alignment. */ | |
30 | #define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\ | |
31 | (((pow)-((x)&((pow)-1))))) | |
32 | ||
28bd2049 DT |
33 | static int inactivity_timeout = 1000; |
34 | module_param(inactivity_timeout, int, S_IRUGO | S_IWUSR); | |
35 | MODULE_PARM_DESC(inactivity_timeout, "Inactivity timeout on HSI, ms."); | |
36 | ||
40d69043 DT |
37 | /* |
38 | * HSI padding options. | |
39 | * Warning: must be a base of 2 (& operation used) and can not be zero ! | |
40 | */ | |
41 | static int hsi_head_align = 4; | |
42 | module_param(hsi_head_align, int, S_IRUGO); | |
43 | MODULE_PARM_DESC(hsi_head_align, "HSI head alignment."); | |
44 | ||
45 | static int hsi_tail_align = 4; | |
46 | module_param(hsi_tail_align, int, S_IRUGO); | |
47 | MODULE_PARM_DESC(hsi_tail_align, "HSI tail alignment."); | |
48 | ||
49 | /* | |
50 | * HSI link layer flowcontrol thresholds. | |
51 | * Warning: A high threshold value migth increase throughput but it will at | |
52 | * the same time prevent channel prioritization and increase the risk of | |
53 | * flooding the modem. The high threshold should be above the low. | |
54 | */ | |
55 | static int hsi_high_threshold = 100; | |
56 | module_param(hsi_high_threshold, int, S_IRUGO); | |
57 | MODULE_PARM_DESC(hsi_high_threshold, "HSI high threshold (FLOW OFF)."); | |
58 | ||
59 | static int hsi_low_threshold = 50; | |
60 | module_param(hsi_low_threshold, int, S_IRUGO); | |
61 | MODULE_PARM_DESC(hsi_low_threshold, "HSI high threshold (FLOW ON)."); | |
62 | ||
63 | #define ON 1 | |
64 | #define OFF 0 | |
65 | ||
66 | /* | |
67 | * Threshold values for the HSI packet queue. Flowcontrol will be asserted | |
68 | * when the number of packets exceeds HIGH_WATER_MARK. It will not be | |
69 | * de-asserted before the number of packets drops below LOW_WATER_MARK. | |
70 | */ | |
71 | #define LOW_WATER_MARK hsi_low_threshold | |
72 | #define HIGH_WATER_MARK hsi_high_threshold | |
73 | ||
74 | static LIST_HEAD(cfhsi_list); | |
75 | static spinlock_t cfhsi_list_lock; | |
76 | ||
77 | static void cfhsi_inactivity_tout(unsigned long arg) | |
78 | { | |
79 | struct cfhsi *cfhsi = (struct cfhsi *)arg; | |
80 | ||
81 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
82 | __func__); | |
83 | ||
84 | /* Schedule power down work queue. */ | |
85 | if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
86 | queue_work(cfhsi->wq, &cfhsi->wake_down_work); | |
87 | } | |
88 | ||
89 | static void cfhsi_abort_tx(struct cfhsi *cfhsi) | |
90 | { | |
91 | struct sk_buff *skb; | |
92 | ||
93 | for (;;) { | |
94 | spin_lock_bh(&cfhsi->lock); | |
95 | skb = skb_dequeue(&cfhsi->qhead); | |
96 | if (!skb) | |
97 | break; | |
98 | ||
99 | cfhsi->ndev->stats.tx_errors++; | |
100 | cfhsi->ndev->stats.tx_dropped++; | |
101 | spin_unlock_bh(&cfhsi->lock); | |
102 | kfree_skb(skb); | |
103 | } | |
104 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
105 | if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
28bd2049 DT |
106 | mod_timer(&cfhsi->timer, |
107 | jiffies + cfhsi->inactivity_timeout); | |
40d69043 DT |
108 | spin_unlock_bh(&cfhsi->lock); |
109 | } | |
110 | ||
111 | static int cfhsi_flush_fifo(struct cfhsi *cfhsi) | |
112 | { | |
113 | char buffer[32]; /* Any reasonable value */ | |
114 | size_t fifo_occupancy; | |
115 | int ret; | |
116 | ||
117 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
118 | __func__); | |
119 | ||
40d69043 DT |
120 | do { |
121 | ret = cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, | |
122 | &fifo_occupancy); | |
123 | if (ret) { | |
124 | dev_warn(&cfhsi->ndev->dev, | |
125 | "%s: can't get FIFO occupancy: %d.\n", | |
126 | __func__, ret); | |
127 | break; | |
128 | } else if (!fifo_occupancy) | |
129 | /* No more data, exitting normally */ | |
130 | break; | |
131 | ||
132 | fifo_occupancy = min(sizeof(buffer), fifo_occupancy); | |
133 | set_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits); | |
134 | ret = cfhsi->dev->cfhsi_rx(buffer, fifo_occupancy, | |
135 | cfhsi->dev); | |
136 | if (ret) { | |
137 | clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits); | |
138 | dev_warn(&cfhsi->ndev->dev, | |
139 | "%s: can't read data: %d.\n", | |
140 | __func__, ret); | |
141 | break; | |
142 | } | |
143 | ||
144 | ret = 5 * HZ; | |
687b13e9 | 145 | ret = wait_event_interruptible_timeout(cfhsi->flush_fifo_wait, |
40d69043 DT |
146 | !test_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits), ret); |
147 | ||
148 | if (ret < 0) { | |
149 | dev_warn(&cfhsi->ndev->dev, | |
150 | "%s: can't wait for flush complete: %d.\n", | |
151 | __func__, ret); | |
152 | break; | |
153 | } else if (!ret) { | |
154 | ret = -ETIMEDOUT; | |
155 | dev_warn(&cfhsi->ndev->dev, | |
156 | "%s: timeout waiting for flush complete.\n", | |
157 | __func__); | |
158 | break; | |
159 | } | |
160 | } while (1); | |
161 | ||
40d69043 DT |
162 | return ret; |
163 | } | |
164 | ||
165 | static int cfhsi_tx_frm(struct cfhsi_desc *desc, struct cfhsi *cfhsi) | |
166 | { | |
167 | int nfrms = 0; | |
168 | int pld_len = 0; | |
169 | struct sk_buff *skb; | |
170 | u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; | |
171 | ||
172 | skb = skb_dequeue(&cfhsi->qhead); | |
173 | if (!skb) | |
174 | return 0; | |
175 | ||
94230feb | 176 | /* Clear offset. */ |
177 | desc->offset = 0; | |
178 | ||
40d69043 DT |
179 | /* Check if we can embed a CAIF frame. */ |
180 | if (skb->len < CFHSI_MAX_EMB_FRM_SZ) { | |
181 | struct caif_payload_info *info; | |
182 | int hpad = 0; | |
183 | int tpad = 0; | |
184 | ||
185 | /* Calculate needed head alignment and tail alignment. */ | |
186 | info = (struct caif_payload_info *)&skb->cb; | |
187 | ||
188 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); | |
189 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); | |
190 | ||
191 | /* Check if frame still fits with added alignment. */ | |
192 | if ((skb->len + hpad + tpad) <= CFHSI_MAX_EMB_FRM_SZ) { | |
193 | u8 *pemb = desc->emb_frm; | |
194 | desc->offset = CFHSI_DESC_SHORT_SZ; | |
195 | *pemb = (u8)(hpad - 1); | |
196 | pemb += hpad; | |
197 | ||
198 | /* Update network statistics. */ | |
199 | cfhsi->ndev->stats.tx_packets++; | |
200 | cfhsi->ndev->stats.tx_bytes += skb->len; | |
201 | ||
202 | /* Copy in embedded CAIF frame. */ | |
203 | skb_copy_bits(skb, 0, pemb, skb->len); | |
204 | consume_skb(skb); | |
205 | skb = NULL; | |
206 | } | |
94230feb | 207 | } |
40d69043 DT |
208 | |
209 | /* Create payload CAIF frames. */ | |
210 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; | |
211 | while (nfrms < CFHSI_MAX_PKTS) { | |
212 | struct caif_payload_info *info; | |
213 | int hpad = 0; | |
214 | int tpad = 0; | |
215 | ||
216 | if (!skb) | |
217 | skb = skb_dequeue(&cfhsi->qhead); | |
218 | ||
219 | if (!skb) | |
220 | break; | |
221 | ||
222 | /* Calculate needed head alignment and tail alignment. */ | |
223 | info = (struct caif_payload_info *)&skb->cb; | |
224 | ||
225 | hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align); | |
226 | tpad = PAD_POW2((skb->len + hpad), hsi_tail_align); | |
227 | ||
228 | /* Fill in CAIF frame length in descriptor. */ | |
229 | desc->cffrm_len[nfrms] = hpad + skb->len + tpad; | |
230 | ||
231 | /* Fill head padding information. */ | |
232 | *pfrm = (u8)(hpad - 1); | |
233 | pfrm += hpad; | |
234 | ||
235 | /* Update network statistics. */ | |
236 | cfhsi->ndev->stats.tx_packets++; | |
237 | cfhsi->ndev->stats.tx_bytes += skb->len; | |
238 | ||
239 | /* Copy in CAIF frame. */ | |
240 | skb_copy_bits(skb, 0, pfrm, skb->len); | |
241 | ||
242 | /* Update payload length. */ | |
243 | pld_len += desc->cffrm_len[nfrms]; | |
244 | ||
245 | /* Update frame pointer. */ | |
246 | pfrm += skb->len + tpad; | |
247 | consume_skb(skb); | |
248 | skb = NULL; | |
249 | ||
250 | /* Update number of frames. */ | |
251 | nfrms++; | |
252 | } | |
253 | ||
254 | /* Unused length fields should be zero-filled (according to SPEC). */ | |
255 | while (nfrms < CFHSI_MAX_PKTS) { | |
256 | desc->cffrm_len[nfrms] = 0x0000; | |
257 | nfrms++; | |
258 | } | |
259 | ||
260 | /* Check if we can piggy-back another descriptor. */ | |
261 | skb = skb_peek(&cfhsi->qhead); | |
262 | if (skb) | |
263 | desc->header |= CFHSI_PIGGY_DESC; | |
264 | else | |
265 | desc->header &= ~CFHSI_PIGGY_DESC; | |
266 | ||
267 | return CFHSI_DESC_SZ + pld_len; | |
268 | } | |
269 | ||
687b13e9 | 270 | static void cfhsi_tx_done(struct cfhsi *cfhsi) |
40d69043 | 271 | { |
40d69043 DT |
272 | struct cfhsi_desc *desc = NULL; |
273 | int len = 0; | |
274 | int res; | |
275 | ||
687b13e9 | 276 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__); |
40d69043 DT |
277 | |
278 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
279 | return; | |
280 | ||
281 | desc = (struct cfhsi_desc *)cfhsi->tx_buf; | |
282 | ||
283 | do { | |
284 | /* | |
285 | * Send flow on if flow off has been previously signalled | |
286 | * and number of packets is below low water mark. | |
287 | */ | |
288 | spin_lock_bh(&cfhsi->lock); | |
289 | if (cfhsi->flow_off_sent && | |
290 | cfhsi->qhead.qlen <= cfhsi->q_low_mark && | |
291 | cfhsi->cfdev.flowctrl) { | |
292 | ||
293 | cfhsi->flow_off_sent = 0; | |
294 | cfhsi->cfdev.flowctrl(cfhsi->ndev, ON); | |
295 | } | |
296 | spin_unlock_bh(&cfhsi->lock); | |
297 | ||
298 | /* Create HSI frame. */ | |
fe47f125 DT |
299 | do { |
300 | len = cfhsi_tx_frm(desc, cfhsi); | |
301 | if (!len) { | |
302 | spin_lock_bh(&cfhsi->lock); | |
303 | if (unlikely(skb_peek(&cfhsi->qhead))) { | |
304 | spin_unlock_bh(&cfhsi->lock); | |
305 | continue; | |
306 | } | |
307 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
308 | /* Start inactivity timer. */ | |
309 | mod_timer(&cfhsi->timer, | |
28bd2049 | 310 | jiffies + cfhsi->inactivity_timeout); |
fe47f125 DT |
311 | spin_unlock_bh(&cfhsi->lock); |
312 | goto done; | |
313 | } | |
314 | } while (!len); | |
40d69043 DT |
315 | |
316 | /* Set up new transfer. */ | |
317 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
318 | if (WARN_ON(res < 0)) { | |
319 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
320 | __func__, res); | |
321 | } | |
322 | } while (res < 0); | |
fe47f125 DT |
323 | |
324 | done: | |
325 | return; | |
40d69043 DT |
326 | } |
327 | ||
328 | static void cfhsi_tx_done_cb(struct cfhsi_drv *drv) | |
329 | { | |
330 | struct cfhsi *cfhsi; | |
331 | ||
332 | cfhsi = container_of(drv, struct cfhsi, drv); | |
333 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
334 | __func__); | |
335 | ||
336 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
337 | return; | |
687b13e9 | 338 | cfhsi_tx_done(cfhsi); |
40d69043 DT |
339 | } |
340 | ||
5bbed92d | 341 | static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi) |
40d69043 DT |
342 | { |
343 | int xfer_sz = 0; | |
344 | int nfrms = 0; | |
345 | u16 *plen = NULL; | |
346 | u8 *pfrm = NULL; | |
347 | ||
348 | if ((desc->header & ~CFHSI_PIGGY_DESC) || | |
349 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ)) { | |
350 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", | |
351 | __func__); | |
5bbed92d | 352 | return -EPROTO; |
40d69043 DT |
353 | } |
354 | ||
355 | /* Check for embedded CAIF frame. */ | |
356 | if (desc->offset) { | |
357 | struct sk_buff *skb; | |
358 | u8 *dst = NULL; | |
687b13e9 | 359 | int len = 0; |
40d69043 DT |
360 | pfrm = ((u8 *)desc) + desc->offset; |
361 | ||
362 | /* Remove offset padding. */ | |
363 | pfrm += *pfrm + 1; | |
364 | ||
365 | /* Read length of CAIF frame (little endian). */ | |
366 | len = *pfrm; | |
367 | len |= ((*(pfrm+1)) << 8) & 0xFF00; | |
368 | len += 2; /* Add FCS fields. */ | |
369 | ||
5bbed92d DM |
370 | /* Sanity check length of CAIF frame. */ |
371 | if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) { | |
372 | dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n", | |
373 | __func__); | |
374 | return -EPROTO; | |
375 | } | |
40d69043 DT |
376 | |
377 | /* Allocate SKB (OK even in IRQ context). */ | |
687b13e9 DM |
378 | skb = alloc_skb(len + 1, GFP_ATOMIC); |
379 | if (!skb) { | |
380 | dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n", | |
381 | __func__); | |
382 | return -ENOMEM; | |
40d69043 DT |
383 | } |
384 | caif_assert(skb != NULL); | |
385 | ||
386 | dst = skb_put(skb, len); | |
387 | memcpy(dst, pfrm, len); | |
388 | ||
389 | skb->protocol = htons(ETH_P_CAIF); | |
390 | skb_reset_mac_header(skb); | |
391 | skb->dev = cfhsi->ndev; | |
392 | ||
393 | /* | |
394 | * We are called from a arch specific platform device. | |
395 | * Unfortunately we don't know what context we're | |
396 | * running in. | |
397 | */ | |
398 | if (in_interrupt()) | |
399 | netif_rx(skb); | |
400 | else | |
401 | netif_rx_ni(skb); | |
402 | ||
403 | /* Update network statistics. */ | |
404 | cfhsi->ndev->stats.rx_packets++; | |
405 | cfhsi->ndev->stats.rx_bytes += len; | |
406 | } | |
407 | ||
40d69043 DT |
408 | /* Calculate transfer length. */ |
409 | plen = desc->cffrm_len; | |
410 | while (nfrms < CFHSI_MAX_PKTS && *plen) { | |
411 | xfer_sz += *plen; | |
412 | plen++; | |
413 | nfrms++; | |
414 | } | |
415 | ||
416 | /* Check for piggy-backed descriptor. */ | |
417 | if (desc->header & CFHSI_PIGGY_DESC) | |
418 | xfer_sz += CFHSI_DESC_SZ; | |
419 | ||
5bbed92d | 420 | if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) { |
40d69043 DT |
421 | dev_err(&cfhsi->ndev->dev, |
422 | "%s: Invalid payload len: %d, ignored.\n", | |
423 | __func__, xfer_sz); | |
5bbed92d | 424 | return -EPROTO; |
40d69043 | 425 | } |
40d69043 DT |
426 | return xfer_sz; |
427 | } | |
428 | ||
5bbed92d | 429 | static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi) |
40d69043 DT |
430 | { |
431 | int rx_sz = 0; | |
432 | int nfrms = 0; | |
433 | u16 *plen = NULL; | |
434 | u8 *pfrm = NULL; | |
435 | ||
436 | /* Sanity check header and offset. */ | |
437 | if (WARN_ON((desc->header & ~CFHSI_PIGGY_DESC) || | |
438 | (desc->offset > CFHSI_MAX_EMB_FRM_SZ))) { | |
439 | dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n", | |
440 | __func__); | |
5bbed92d | 441 | return -EPROTO; |
40d69043 DT |
442 | } |
443 | ||
444 | /* Set frame pointer to start of payload. */ | |
445 | pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ; | |
446 | plen = desc->cffrm_len; | |
687b13e9 DM |
447 | |
448 | /* Skip already processed frames. */ | |
449 | while (nfrms < cfhsi->rx_state.nfrms) { | |
450 | pfrm += *plen; | |
451 | rx_sz += *plen; | |
452 | plen++; | |
453 | nfrms++; | |
454 | } | |
455 | ||
456 | /* Parse payload. */ | |
40d69043 DT |
457 | while (nfrms < CFHSI_MAX_PKTS && *plen) { |
458 | struct sk_buff *skb; | |
459 | u8 *dst = NULL; | |
460 | u8 *pcffrm = NULL; | |
687b13e9 | 461 | int len = 0; |
40d69043 | 462 | |
40d69043 DT |
463 | /* CAIF frame starts after head padding. */ |
464 | pcffrm = pfrm + *pfrm + 1; | |
465 | ||
466 | /* Read length of CAIF frame (little endian). */ | |
467 | len = *pcffrm; | |
468 | len |= ((*(pcffrm + 1)) << 8) & 0xFF00; | |
469 | len += 2; /* Add FCS fields. */ | |
470 | ||
5bbed92d DM |
471 | /* Sanity check length of CAIF frames. */ |
472 | if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) { | |
473 | dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n", | |
474 | __func__); | |
475 | return -EPROTO; | |
476 | } | |
477 | ||
40d69043 | 478 | /* Allocate SKB (OK even in IRQ context). */ |
687b13e9 DM |
479 | skb = alloc_skb(len + 1, GFP_ATOMIC); |
480 | if (!skb) { | |
481 | dev_err(&cfhsi->ndev->dev, "%s: Out of memory !\n", | |
482 | __func__); | |
483 | cfhsi->rx_state.nfrms = nfrms; | |
484 | return -ENOMEM; | |
40d69043 DT |
485 | } |
486 | caif_assert(skb != NULL); | |
487 | ||
488 | dst = skb_put(skb, len); | |
489 | memcpy(dst, pcffrm, len); | |
490 | ||
491 | skb->protocol = htons(ETH_P_CAIF); | |
492 | skb_reset_mac_header(skb); | |
493 | skb->dev = cfhsi->ndev; | |
494 | ||
495 | /* | |
496 | * We're called from a platform device, | |
497 | * and don't know the context we're running in. | |
498 | */ | |
499 | if (in_interrupt()) | |
500 | netif_rx(skb); | |
501 | else | |
502 | netif_rx_ni(skb); | |
503 | ||
504 | /* Update network statistics. */ | |
505 | cfhsi->ndev->stats.rx_packets++; | |
506 | cfhsi->ndev->stats.rx_bytes += len; | |
507 | ||
40d69043 DT |
508 | pfrm += *plen; |
509 | rx_sz += *plen; | |
510 | plen++; | |
511 | nfrms++; | |
512 | } | |
513 | ||
514 | return rx_sz; | |
515 | } | |
516 | ||
687b13e9 | 517 | static void cfhsi_rx_done(struct cfhsi *cfhsi) |
40d69043 DT |
518 | { |
519 | int res; | |
520 | int desc_pld_len = 0; | |
40d69043 DT |
521 | struct cfhsi_desc *desc = NULL; |
522 | ||
40d69043 DT |
523 | desc = (struct cfhsi_desc *)cfhsi->rx_buf; |
524 | ||
687b13e9 | 525 | dev_dbg(&cfhsi->ndev->dev, "%s\n", __func__); |
40d69043 DT |
526 | |
527 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
528 | return; | |
529 | ||
530 | /* Update inactivity timer if pending. */ | |
73033c98 | 531 | spin_lock_bh(&cfhsi->lock); |
28bd2049 DT |
532 | mod_timer_pending(&cfhsi->timer, |
533 | jiffies + cfhsi->inactivity_timeout); | |
73033c98 | 534 | spin_unlock_bh(&cfhsi->lock); |
40d69043 | 535 | |
687b13e9 | 536 | if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) { |
5bbed92d | 537 | desc_pld_len = cfhsi_rx_desc(desc, cfhsi); |
687b13e9 DM |
538 | if (desc_pld_len == -ENOMEM) |
539 | goto restart; | |
5bbed92d DM |
540 | if (desc_pld_len == -EPROTO) |
541 | goto out_of_sync; | |
40d69043 DT |
542 | } else { |
543 | int pld_len; | |
544 | ||
687b13e9 | 545 | if (!cfhsi->rx_state.piggy_desc) { |
5bbed92d | 546 | pld_len = cfhsi_rx_pld(desc, cfhsi); |
687b13e9 DM |
547 | if (pld_len == -ENOMEM) |
548 | goto restart; | |
5bbed92d DM |
549 | if (pld_len == -EPROTO) |
550 | goto out_of_sync; | |
687b13e9 DM |
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. */ | |
5bbed92d | 564 | desc_pld_len = cfhsi_rx_desc(piggy_desc, cfhsi); |
687b13e9 DM |
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); | |
40d69043 | 574 | |
5bbed92d DM |
575 | if (desc_pld_len == -EPROTO) |
576 | goto out_of_sync; | |
577 | } | |
687b13e9 DM |
578 | } |
579 | ||
580 | memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state)); | |
40d69043 | 581 | if (desc_pld_len) { |
687b13e9 | 582 | cfhsi->rx_state.state = CFHSI_RX_STATE_PAYLOAD; |
40d69043 DT |
583 | cfhsi->rx_ptr = cfhsi->rx_buf + CFHSI_DESC_SZ; |
584 | cfhsi->rx_len = desc_pld_len; | |
585 | } else { | |
687b13e9 | 586 | cfhsi->rx_state.state = CFHSI_RX_STATE_DESC; |
40d69043 DT |
587 | cfhsi->rx_ptr = cfhsi->rx_buf; |
588 | cfhsi->rx_len = CFHSI_DESC_SZ; | |
589 | } | |
40d69043 DT |
590 | |
591 | if (test_bit(CFHSI_AWAKE, &cfhsi->bits)) { | |
592 | /* Set up new transfer. */ | |
593 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", | |
594 | __func__); | |
595 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, | |
596 | cfhsi->dev); | |
597 | if (WARN_ON(res < 0)) { | |
598 | dev_err(&cfhsi->ndev->dev, "%s: RX error %d.\n", | |
599 | __func__, res); | |
600 | cfhsi->ndev->stats.rx_errors++; | |
601 | cfhsi->ndev->stats.rx_dropped++; | |
602 | } | |
603 | } | |
687b13e9 DM |
604 | return; |
605 | ||
606 | restart: | |
607 | if (++cfhsi->rx_state.retries > CFHSI_MAX_RX_RETRIES) { | |
608 | dev_err(&cfhsi->ndev->dev, "%s: No memory available " | |
609 | "in %d iterations.\n", | |
610 | __func__, CFHSI_MAX_RX_RETRIES); | |
611 | BUG(); | |
612 | } | |
613 | mod_timer(&cfhsi->rx_slowpath_timer, jiffies + 1); | |
5bbed92d DM |
614 | return; |
615 | ||
616 | out_of_sync: | |
617 | dev_err(&cfhsi->ndev->dev, "%s: Out of sync.\n", __func__); | |
618 | print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE, | |
619 | cfhsi->rx_buf, CFHSI_DESC_SZ); | |
620 | schedule_work(&cfhsi->out_of_sync_work); | |
687b13e9 DM |
621 | } |
622 | ||
623 | static void cfhsi_rx_slowpath(unsigned long arg) | |
624 | { | |
625 | struct cfhsi *cfhsi = (struct cfhsi *)arg; | |
626 | ||
627 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
628 | __func__); | |
629 | ||
630 | cfhsi_rx_done(cfhsi); | |
40d69043 DT |
631 | } |
632 | ||
633 | static void cfhsi_rx_done_cb(struct cfhsi_drv *drv) | |
634 | { | |
635 | struct cfhsi *cfhsi; | |
636 | ||
637 | cfhsi = container_of(drv, struct cfhsi, drv); | |
638 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
639 | __func__); | |
640 | ||
641 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
642 | return; | |
643 | ||
40d69043 DT |
644 | if (test_and_clear_bit(CFHSI_FLUSH_FIFO, &cfhsi->bits)) |
645 | wake_up_interruptible(&cfhsi->flush_fifo_wait); | |
646 | else | |
687b13e9 | 647 | cfhsi_rx_done(cfhsi); |
40d69043 DT |
648 | } |
649 | ||
650 | static void cfhsi_wake_up(struct work_struct *work) | |
651 | { | |
652 | struct cfhsi *cfhsi = NULL; | |
653 | int res; | |
654 | int len; | |
655 | long ret; | |
656 | ||
657 | cfhsi = container_of(work, struct cfhsi, wake_up_work); | |
658 | ||
659 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
660 | return; | |
661 | ||
662 | if (unlikely(test_bit(CFHSI_AWAKE, &cfhsi->bits))) { | |
663 | /* It happenes when wakeup is requested by | |
664 | * both ends at the same time. */ | |
665 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
5ea2ef5f | 666 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); |
40d69043 DT |
667 | return; |
668 | } | |
669 | ||
670 | /* Activate wake line. */ | |
671 | cfhsi->dev->cfhsi_wake_up(cfhsi->dev); | |
672 | ||
673 | dev_dbg(&cfhsi->ndev->dev, "%s: Start waiting.\n", | |
674 | __func__); | |
675 | ||
676 | /* Wait for acknowledge. */ | |
687b13e9 DM |
677 | ret = CFHSI_WAKE_TOUT; |
678 | ret = wait_event_interruptible_timeout(cfhsi->wake_up_wait, | |
679 | test_and_clear_bit(CFHSI_WAKE_UP_ACK, | |
40d69043 DT |
680 | &cfhsi->bits), ret); |
681 | if (unlikely(ret < 0)) { | |
682 | /* Interrupted by signal. */ | |
5ea2ef5f | 683 | dev_err(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", |
40d69043 | 684 | __func__, ret); |
5ea2ef5f | 685 | |
40d69043 DT |
686 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
687 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
688 | return; | |
689 | } else if (!ret) { | |
5ea2ef5f DM |
690 | bool ca_wake = false; |
691 | size_t fifo_occupancy = 0; | |
692 | ||
40d69043 DT |
693 | /* Wakeup timeout */ |
694 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", | |
695 | __func__); | |
5ea2ef5f DM |
696 | |
697 | /* Check FIFO to check if modem has sent something. */ | |
698 | WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, | |
699 | &fifo_occupancy)); | |
700 | ||
701 | dev_err(&cfhsi->ndev->dev, "%s: Bytes in FIFO: %u.\n", | |
702 | __func__, (unsigned) fifo_occupancy); | |
703 | ||
704 | /* Check if we misssed the interrupt. */ | |
705 | WARN_ON(cfhsi->dev->cfhsi_get_peer_wake(cfhsi->dev, | |
706 | &ca_wake)); | |
707 | ||
708 | if (ca_wake) { | |
709 | dev_err(&cfhsi->ndev->dev, "%s: CA Wake missed !.\n", | |
710 | __func__); | |
711 | ||
712 | /* Clear the CFHSI_WAKE_UP_ACK bit to prevent race. */ | |
713 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
714 | ||
715 | /* Continue execution. */ | |
716 | goto wake_ack; | |
717 | } | |
718 | ||
40d69043 DT |
719 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); |
720 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
721 | return; | |
722 | } | |
5ea2ef5f | 723 | wake_ack: |
40d69043 DT |
724 | dev_dbg(&cfhsi->ndev->dev, "%s: Woken.\n", |
725 | __func__); | |
726 | ||
727 | /* Clear power up bit. */ | |
728 | set_bit(CFHSI_AWAKE, &cfhsi->bits); | |
729 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
730 | ||
731 | /* Resume read operation. */ | |
687b13e9 DM |
732 | dev_dbg(&cfhsi->ndev->dev, "%s: Start RX.\n", __func__); |
733 | res = cfhsi->dev->cfhsi_rx(cfhsi->rx_ptr, cfhsi->rx_len, cfhsi->dev); | |
734 | ||
735 | if (WARN_ON(res < 0)) | |
736 | dev_err(&cfhsi->ndev->dev, "%s: RX err %d.\n", __func__, res); | |
40d69043 DT |
737 | |
738 | /* Clear power up acknowledment. */ | |
739 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
740 | ||
741 | spin_lock_bh(&cfhsi->lock); | |
742 | ||
743 | /* Resume transmit if queue is not empty. */ | |
744 | if (!skb_peek(&cfhsi->qhead)) { | |
745 | dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n", | |
746 | __func__); | |
747 | /* Start inactivity timer. */ | |
748 | mod_timer(&cfhsi->timer, | |
28bd2049 | 749 | jiffies + cfhsi->inactivity_timeout); |
40d69043 DT |
750 | spin_unlock_bh(&cfhsi->lock); |
751 | return; | |
752 | } | |
753 | ||
754 | dev_dbg(&cfhsi->ndev->dev, "%s: Host wake.\n", | |
755 | __func__); | |
756 | ||
757 | spin_unlock_bh(&cfhsi->lock); | |
758 | ||
759 | /* Create HSI frame. */ | |
760 | len = cfhsi_tx_frm((struct cfhsi_desc *)cfhsi->tx_buf, cfhsi); | |
761 | ||
762 | if (likely(len > 0)) { | |
763 | /* Set up new transfer. */ | |
764 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
765 | if (WARN_ON(res < 0)) { | |
766 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
767 | __func__, res); | |
768 | cfhsi_abort_tx(cfhsi); | |
769 | } | |
770 | } else { | |
771 | dev_err(&cfhsi->ndev->dev, | |
772 | "%s: Failed to create HSI frame: %d.\n", | |
773 | __func__, len); | |
774 | } | |
40d69043 DT |
775 | } |
776 | ||
777 | static void cfhsi_wake_down(struct work_struct *work) | |
778 | { | |
779 | long ret; | |
780 | struct cfhsi *cfhsi = NULL; | |
687b13e9 DM |
781 | size_t fifo_occupancy = 0; |
782 | int retry = CFHSI_WAKE_TOUT; | |
40d69043 DT |
783 | |
784 | cfhsi = container_of(work, struct cfhsi, wake_down_work); | |
687b13e9 | 785 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__); |
40d69043 DT |
786 | |
787 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
788 | return; | |
789 | ||
40d69043 DT |
790 | /* Deactivate wake line. */ |
791 | cfhsi->dev->cfhsi_wake_down(cfhsi->dev); | |
792 | ||
793 | /* Wait for acknowledge. */ | |
687b13e9 | 794 | ret = CFHSI_WAKE_TOUT; |
40d69043 | 795 | ret = wait_event_interruptible_timeout(cfhsi->wake_down_wait, |
687b13e9 DM |
796 | test_and_clear_bit(CFHSI_WAKE_DOWN_ACK, |
797 | &cfhsi->bits), ret); | |
40d69043 DT |
798 | if (ret < 0) { |
799 | /* Interrupted by signal. */ | |
5ea2ef5f | 800 | dev_err(&cfhsi->ndev->dev, "%s: Signalled: %ld.\n", |
40d69043 DT |
801 | __func__, ret); |
802 | return; | |
803 | } else if (!ret) { | |
5ea2ef5f DM |
804 | bool ca_wake = true; |
805 | ||
40d69043 | 806 | /* Timeout */ |
687b13e9 | 807 | dev_err(&cfhsi->ndev->dev, "%s: Timeout.\n", __func__); |
5ea2ef5f DM |
808 | |
809 | /* Check if we misssed the interrupt. */ | |
810 | WARN_ON(cfhsi->dev->cfhsi_get_peer_wake(cfhsi->dev, | |
811 | &ca_wake)); | |
812 | if (!ca_wake) | |
813 | dev_err(&cfhsi->ndev->dev, "%s: CA Wake missed !.\n", | |
814 | __func__); | |
40d69043 DT |
815 | } |
816 | ||
687b13e9 DM |
817 | /* Check FIFO occupancy. */ |
818 | while (retry) { | |
819 | WARN_ON(cfhsi->dev->cfhsi_fifo_occupancy(cfhsi->dev, | |
820 | &fifo_occupancy)); | |
821 | ||
822 | if (!fifo_occupancy) | |
823 | break; | |
824 | ||
825 | set_current_state(TASK_INTERRUPTIBLE); | |
826 | schedule_timeout(1); | |
827 | retry--; | |
828 | } | |
829 | ||
830 | if (!retry) | |
831 | dev_err(&cfhsi->ndev->dev, "%s: FIFO Timeout.\n", __func__); | |
832 | ||
833 | /* Clear AWAKE condition. */ | |
40d69043 DT |
834 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); |
835 | ||
687b13e9 DM |
836 | /* Cancel pending RX requests. */ |
837 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); | |
40d69043 | 838 | |
40d69043 DT |
839 | } |
840 | ||
5bbed92d DM |
841 | static void cfhsi_out_of_sync(struct work_struct *work) |
842 | { | |
843 | struct cfhsi *cfhsi = NULL; | |
844 | ||
845 | cfhsi = container_of(work, struct cfhsi, out_of_sync_work); | |
846 | ||
847 | rtnl_lock(); | |
848 | dev_close(cfhsi->ndev); | |
849 | rtnl_unlock(); | |
850 | } | |
851 | ||
40d69043 DT |
852 | static void cfhsi_wake_up_cb(struct cfhsi_drv *drv) |
853 | { | |
854 | struct cfhsi *cfhsi = NULL; | |
855 | ||
856 | cfhsi = container_of(drv, struct cfhsi, drv); | |
857 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
858 | __func__); | |
859 | ||
860 | set_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
861 | wake_up_interruptible(&cfhsi->wake_up_wait); | |
862 | ||
863 | if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits)) | |
864 | return; | |
865 | ||
866 | /* Schedule wake up work queue if the peer initiates. */ | |
867 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
868 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
869 | } | |
870 | ||
871 | static void cfhsi_wake_down_cb(struct cfhsi_drv *drv) | |
872 | { | |
873 | struct cfhsi *cfhsi = NULL; | |
874 | ||
875 | cfhsi = container_of(drv, struct cfhsi, drv); | |
876 | dev_dbg(&cfhsi->ndev->dev, "%s.\n", | |
877 | __func__); | |
878 | ||
879 | /* Initiating low power is only permitted by the host (us). */ | |
880 | set_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
881 | wake_up_interruptible(&cfhsi->wake_down_wait); | |
882 | } | |
883 | ||
884 | static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev) | |
885 | { | |
886 | struct cfhsi *cfhsi = NULL; | |
887 | int start_xfer = 0; | |
888 | int timer_active; | |
889 | ||
890 | if (!dev) | |
891 | return -EINVAL; | |
892 | ||
893 | cfhsi = netdev_priv(dev); | |
894 | ||
895 | spin_lock_bh(&cfhsi->lock); | |
896 | ||
897 | skb_queue_tail(&cfhsi->qhead, skb); | |
898 | ||
899 | /* Sanity check; xmit should not be called after unregister_netdev */ | |
900 | if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) { | |
901 | spin_unlock_bh(&cfhsi->lock); | |
902 | cfhsi_abort_tx(cfhsi); | |
903 | return -EINVAL; | |
904 | } | |
905 | ||
906 | /* Send flow off if number of packets is above high water mark. */ | |
907 | if (!cfhsi->flow_off_sent && | |
908 | cfhsi->qhead.qlen > cfhsi->q_high_mark && | |
909 | cfhsi->cfdev.flowctrl) { | |
910 | cfhsi->flow_off_sent = 1; | |
911 | cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF); | |
912 | } | |
913 | ||
914 | if (cfhsi->tx_state == CFHSI_TX_STATE_IDLE) { | |
915 | cfhsi->tx_state = CFHSI_TX_STATE_XFER; | |
916 | start_xfer = 1; | |
917 | } | |
918 | ||
73033c98 DT |
919 | if (!start_xfer) { |
920 | spin_unlock_bh(&cfhsi->lock); | |
40d69043 | 921 | return 0; |
73033c98 | 922 | } |
40d69043 DT |
923 | |
924 | /* Delete inactivity timer if started. */ | |
40d69043 | 925 | timer_active = del_timer_sync(&cfhsi->timer); |
40d69043 | 926 | |
73033c98 DT |
927 | spin_unlock_bh(&cfhsi->lock); |
928 | ||
40d69043 DT |
929 | if (timer_active) { |
930 | struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf; | |
931 | int len; | |
932 | int res; | |
933 | ||
934 | /* Create HSI frame. */ | |
935 | len = cfhsi_tx_frm(desc, cfhsi); | |
936 | BUG_ON(!len); | |
937 | ||
938 | /* Set up new transfer. */ | |
939 | res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); | |
940 | if (WARN_ON(res < 0)) { | |
941 | dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n", | |
942 | __func__, res); | |
943 | cfhsi_abort_tx(cfhsi); | |
944 | } | |
945 | } else { | |
946 | /* Schedule wake up work queue if the we initiate. */ | |
947 | if (!test_and_set_bit(CFHSI_WAKE_UP, &cfhsi->bits)) | |
948 | queue_work(cfhsi->wq, &cfhsi->wake_up_work); | |
949 | } | |
950 | ||
951 | return 0; | |
952 | } | |
953 | ||
954 | static int cfhsi_open(struct net_device *dev) | |
955 | { | |
956 | netif_wake_queue(dev); | |
957 | ||
958 | return 0; | |
959 | } | |
960 | ||
961 | static int cfhsi_close(struct net_device *dev) | |
962 | { | |
963 | netif_stop_queue(dev); | |
964 | ||
965 | return 0; | |
966 | } | |
967 | ||
968 | static const struct net_device_ops cfhsi_ops = { | |
969 | .ndo_open = cfhsi_open, | |
970 | .ndo_stop = cfhsi_close, | |
971 | .ndo_start_xmit = cfhsi_xmit | |
972 | }; | |
973 | ||
974 | static void cfhsi_setup(struct net_device *dev) | |
975 | { | |
976 | struct cfhsi *cfhsi = netdev_priv(dev); | |
977 | dev->features = 0; | |
978 | dev->netdev_ops = &cfhsi_ops; | |
979 | dev->type = ARPHRD_CAIF; | |
980 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
981 | dev->mtu = CFHSI_MAX_PAYLOAD_SZ; | |
982 | dev->tx_queue_len = 0; | |
983 | dev->destructor = free_netdev; | |
984 | skb_queue_head_init(&cfhsi->qhead); | |
985 | cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; | |
986 | cfhsi->cfdev.use_frag = false; | |
987 | cfhsi->cfdev.use_stx = false; | |
988 | cfhsi->cfdev.use_fcs = false; | |
989 | cfhsi->ndev = dev; | |
990 | } | |
991 | ||
992 | int cfhsi_probe(struct platform_device *pdev) | |
993 | { | |
994 | struct cfhsi *cfhsi = NULL; | |
995 | struct net_device *ndev; | |
996 | struct cfhsi_dev *dev; | |
997 | int res; | |
998 | ||
999 | ndev = alloc_netdev(sizeof(struct cfhsi), "cfhsi%d", cfhsi_setup); | |
7ac2ed0c | 1000 | if (!ndev) |
40d69043 | 1001 | return -ENODEV; |
40d69043 DT |
1002 | |
1003 | cfhsi = netdev_priv(ndev); | |
1004 | cfhsi->ndev = ndev; | |
1005 | cfhsi->pdev = pdev; | |
1006 | ||
1007 | /* Initialize state vaiables. */ | |
1008 | cfhsi->tx_state = CFHSI_TX_STATE_IDLE; | |
687b13e9 | 1009 | cfhsi->rx_state.state = CFHSI_RX_STATE_DESC; |
40d69043 DT |
1010 | |
1011 | /* Set flow info */ | |
1012 | cfhsi->flow_off_sent = 0; | |
1013 | cfhsi->q_low_mark = LOW_WATER_MARK; | |
1014 | cfhsi->q_high_mark = HIGH_WATER_MARK; | |
1015 | ||
1016 | /* Assign the HSI device. */ | |
1017 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; | |
1018 | cfhsi->dev = dev; | |
1019 | ||
1020 | /* Assign the driver to this HSI device. */ | |
1021 | dev->drv = &cfhsi->drv; | |
1022 | ||
1023 | /* | |
1024 | * Allocate a TX buffer with the size of a HSI packet descriptors | |
1025 | * and the necessary room for CAIF payload frames. | |
1026 | */ | |
1027 | cfhsi->tx_buf = kzalloc(CFHSI_BUF_SZ_TX, GFP_KERNEL); | |
1028 | if (!cfhsi->tx_buf) { | |
40d69043 DT |
1029 | res = -ENODEV; |
1030 | goto err_alloc_tx; | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Allocate a RX buffer with the size of two HSI packet descriptors and | |
1035 | * the necessary room for CAIF payload frames. | |
1036 | */ | |
1037 | cfhsi->rx_buf = kzalloc(CFHSI_BUF_SZ_RX, GFP_KERNEL); | |
1038 | if (!cfhsi->rx_buf) { | |
40d69043 DT |
1039 | res = -ENODEV; |
1040 | goto err_alloc_rx; | |
1041 | } | |
1042 | ||
28bd2049 DT |
1043 | /* Pre-calculate inactivity timeout. */ |
1044 | if (inactivity_timeout != -1) { | |
1045 | cfhsi->inactivity_timeout = | |
1046 | inactivity_timeout * HZ / 1000; | |
1047 | if (!cfhsi->inactivity_timeout) | |
1048 | cfhsi->inactivity_timeout = 1; | |
1049 | else if (cfhsi->inactivity_timeout > NEXT_TIMER_MAX_DELTA) | |
1050 | cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA; | |
1051 | } else { | |
1052 | cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA; | |
1053 | } | |
1054 | ||
1055 | /* Initialize recieve vaiables. */ | |
40d69043 DT |
1056 | cfhsi->rx_ptr = cfhsi->rx_buf; |
1057 | cfhsi->rx_len = CFHSI_DESC_SZ; | |
1058 | ||
1059 | /* Initialize spin locks. */ | |
1060 | spin_lock_init(&cfhsi->lock); | |
1061 | ||
1062 | /* Set up the driver. */ | |
1063 | cfhsi->drv.tx_done_cb = cfhsi_tx_done_cb; | |
1064 | cfhsi->drv.rx_done_cb = cfhsi_rx_done_cb; | |
94230feb | 1065 | cfhsi->drv.wake_up_cb = cfhsi_wake_up_cb; |
1066 | cfhsi->drv.wake_down_cb = cfhsi_wake_down_cb; | |
40d69043 DT |
1067 | |
1068 | /* Initialize the work queues. */ | |
1069 | INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up); | |
1070 | INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down); | |
5bbed92d | 1071 | INIT_WORK(&cfhsi->out_of_sync_work, cfhsi_out_of_sync); |
40d69043 DT |
1072 | |
1073 | /* Clear all bit fields. */ | |
1074 | clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits); | |
1075 | clear_bit(CFHSI_WAKE_DOWN_ACK, &cfhsi->bits); | |
1076 | clear_bit(CFHSI_WAKE_UP, &cfhsi->bits); | |
1077 | clear_bit(CFHSI_AWAKE, &cfhsi->bits); | |
40d69043 DT |
1078 | |
1079 | /* Create work thread. */ | |
1080 | cfhsi->wq = create_singlethread_workqueue(pdev->name); | |
1081 | if (!cfhsi->wq) { | |
1082 | dev_err(&ndev->dev, "%s: Failed to create work queue.\n", | |
1083 | __func__); | |
1084 | res = -ENODEV; | |
1085 | goto err_create_wq; | |
1086 | } | |
1087 | ||
1088 | /* Initialize wait queues. */ | |
1089 | init_waitqueue_head(&cfhsi->wake_up_wait); | |
1090 | init_waitqueue_head(&cfhsi->wake_down_wait); | |
1091 | init_waitqueue_head(&cfhsi->flush_fifo_wait); | |
1092 | ||
1093 | /* Setup the inactivity timer. */ | |
1094 | init_timer(&cfhsi->timer); | |
1095 | cfhsi->timer.data = (unsigned long)cfhsi; | |
1096 | cfhsi->timer.function = cfhsi_inactivity_tout; | |
687b13e9 DM |
1097 | /* Setup the slowpath RX timer. */ |
1098 | init_timer(&cfhsi->rx_slowpath_timer); | |
1099 | cfhsi->rx_slowpath_timer.data = (unsigned long)cfhsi; | |
1100 | cfhsi->rx_slowpath_timer.function = cfhsi_rx_slowpath; | |
40d69043 DT |
1101 | |
1102 | /* Add CAIF HSI device to list. */ | |
1103 | spin_lock(&cfhsi_list_lock); | |
1104 | list_add_tail(&cfhsi->list, &cfhsi_list); | |
1105 | spin_unlock(&cfhsi_list_lock); | |
1106 | ||
1107 | /* Activate HSI interface. */ | |
1108 | res = cfhsi->dev->cfhsi_up(cfhsi->dev); | |
1109 | if (res) { | |
1110 | dev_err(&cfhsi->ndev->dev, | |
1111 | "%s: can't activate HSI interface: %d.\n", | |
1112 | __func__, res); | |
1113 | goto err_activate; | |
1114 | } | |
1115 | ||
1116 | /* Flush FIFO */ | |
1117 | res = cfhsi_flush_fifo(cfhsi); | |
1118 | if (res) { | |
1119 | dev_err(&ndev->dev, "%s: Can't flush FIFO: %d.\n", | |
1120 | __func__, res); | |
1121 | goto err_net_reg; | |
1122 | } | |
1123 | ||
40d69043 DT |
1124 | /* Register network device. */ |
1125 | res = register_netdev(ndev); | |
1126 | if (res) { | |
1127 | dev_err(&ndev->dev, "%s: Registration error: %d.\n", | |
1128 | __func__, res); | |
1129 | goto err_net_reg; | |
1130 | } | |
1131 | ||
1132 | netif_stop_queue(ndev); | |
1133 | ||
1134 | return res; | |
1135 | ||
1136 | err_net_reg: | |
1137 | cfhsi->dev->cfhsi_down(cfhsi->dev); | |
1138 | err_activate: | |
1139 | destroy_workqueue(cfhsi->wq); | |
1140 | err_create_wq: | |
1141 | kfree(cfhsi->rx_buf); | |
1142 | err_alloc_rx: | |
1143 | kfree(cfhsi->tx_buf); | |
1144 | err_alloc_tx: | |
1145 | free_netdev(ndev); | |
1146 | ||
1147 | return res; | |
1148 | } | |
1149 | ||
ca63f8c7 | 1150 | static void cfhsi_shutdown(struct cfhsi *cfhsi) |
40d69043 DT |
1151 | { |
1152 | u8 *tx_buf, *rx_buf; | |
1153 | ||
1154 | /* Stop TXing */ | |
1155 | netif_tx_stop_all_queues(cfhsi->ndev); | |
1156 | ||
1157 | /* going to shutdown driver */ | |
1158 | set_bit(CFHSI_SHUTDOWN, &cfhsi->bits); | |
1159 | ||
40d69043 DT |
1160 | /* Flush workqueue */ |
1161 | flush_workqueue(cfhsi->wq); | |
1162 | ||
687b13e9 | 1163 | /* Delete timers if pending */ |
40d69043 | 1164 | del_timer_sync(&cfhsi->timer); |
687b13e9 | 1165 | del_timer_sync(&cfhsi->rx_slowpath_timer); |
40d69043 DT |
1166 | |
1167 | /* Cancel pending RX request (if any) */ | |
1168 | cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev); | |
1169 | ||
ca63f8c7 | 1170 | /* Destroy workqueue */ |
40d69043 DT |
1171 | destroy_workqueue(cfhsi->wq); |
1172 | ||
1173 | /* Store bufferes: will be freed later. */ | |
1174 | tx_buf = cfhsi->tx_buf; | |
1175 | rx_buf = cfhsi->rx_buf; | |
1176 | ||
1177 | /* Flush transmit queues. */ | |
1178 | cfhsi_abort_tx(cfhsi); | |
1179 | ||
1180 | /* Deactivate interface */ | |
1181 | cfhsi->dev->cfhsi_down(cfhsi->dev); | |
1182 | ||
1183 | /* Finally unregister the network device. */ | |
1184 | unregister_netdev(cfhsi->ndev); | |
1185 | ||
1186 | /* Free buffers. */ | |
1187 | kfree(tx_buf); | |
1188 | kfree(rx_buf); | |
1189 | } | |
1190 | ||
1191 | int cfhsi_remove(struct platform_device *pdev) | |
1192 | { | |
1193 | struct list_head *list_node; | |
1194 | struct list_head *n; | |
1195 | struct cfhsi *cfhsi = NULL; | |
1196 | struct cfhsi_dev *dev; | |
1197 | ||
1198 | dev = (struct cfhsi_dev *)pdev->dev.platform_data; | |
1199 | spin_lock(&cfhsi_list_lock); | |
1200 | list_for_each_safe(list_node, n, &cfhsi_list) { | |
1201 | cfhsi = list_entry(list_node, struct cfhsi, list); | |
1202 | /* Find the corresponding device. */ | |
1203 | if (cfhsi->dev == dev) { | |
1204 | /* Remove from list. */ | |
1205 | list_del(list_node); | |
1206 | spin_unlock(&cfhsi_list_lock); | |
1207 | ||
1208 | /* Shutdown driver. */ | |
ca63f8c7 | 1209 | cfhsi_shutdown(cfhsi); |
40d69043 DT |
1210 | |
1211 | return 0; | |
1212 | } | |
1213 | } | |
1214 | spin_unlock(&cfhsi_list_lock); | |
1215 | return -ENODEV; | |
1216 | } | |
1217 | ||
1218 | struct platform_driver cfhsi_plat_drv = { | |
1219 | .probe = cfhsi_probe, | |
1220 | .remove = cfhsi_remove, | |
1221 | .driver = { | |
1222 | .name = "cfhsi", | |
1223 | .owner = THIS_MODULE, | |
1224 | }, | |
1225 | }; | |
1226 | ||
1227 | static void __exit cfhsi_exit_module(void) | |
1228 | { | |
1229 | struct list_head *list_node; | |
1230 | struct list_head *n; | |
1231 | struct cfhsi *cfhsi = NULL; | |
1232 | ||
1233 | spin_lock(&cfhsi_list_lock); | |
1234 | list_for_each_safe(list_node, n, &cfhsi_list) { | |
1235 | cfhsi = list_entry(list_node, struct cfhsi, list); | |
1236 | ||
1237 | /* Remove from list. */ | |
1238 | list_del(list_node); | |
1239 | spin_unlock(&cfhsi_list_lock); | |
1240 | ||
1241 | /* Shutdown driver. */ | |
ca63f8c7 | 1242 | cfhsi_shutdown(cfhsi); |
40d69043 DT |
1243 | |
1244 | spin_lock(&cfhsi_list_lock); | |
1245 | } | |
1246 | spin_unlock(&cfhsi_list_lock); | |
1247 | ||
1248 | /* Unregister platform driver. */ | |
1249 | platform_driver_unregister(&cfhsi_plat_drv); | |
1250 | } | |
1251 | ||
1252 | static int __init cfhsi_init_module(void) | |
1253 | { | |
1254 | int result; | |
1255 | ||
1256 | /* Initialize spin lock. */ | |
1257 | spin_lock_init(&cfhsi_list_lock); | |
1258 | ||
1259 | /* Register platform driver. */ | |
1260 | result = platform_driver_register(&cfhsi_plat_drv); | |
1261 | if (result) { | |
1262 | printk(KERN_ERR "Could not register platform HSI driver: %d.\n", | |
1263 | result); | |
1264 | goto err_dev_register; | |
1265 | } | |
1266 | ||
1267 | return result; | |
1268 | ||
1269 | err_dev_register: | |
1270 | return result; | |
1271 | } | |
1272 | ||
1273 | module_init(cfhsi_init_module); | |
1274 | module_exit(cfhsi_exit_module); |