Commit | Line | Data |
---|---|---|
529d6dad SB |
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 | * License terms: GNU General Public License (GPL) version 2. | |
6 | */ | |
7 | ||
8 | #include <linux/version.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/workqueue.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/dma-mapping.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/debugfs.h> | |
22 | #include <linux/if_arp.h> | |
23 | #include <net/caif/caif_layer.h> | |
24 | #include <net/caif/caif_spi.h> | |
25 | ||
26 | #ifndef CONFIG_CAIF_SPI_SYNC | |
27 | #define FLAVOR "Flavour: Vanilla.\n" | |
28 | #else | |
29 | #define FLAVOR "Flavour: Master CMD&LEN at start.\n" | |
30 | #endif /* CONFIG_CAIF_SPI_SYNC */ | |
31 | ||
32 | MODULE_LICENSE("GPL"); | |
33 | MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>"); | |
34 | MODULE_DESCRIPTION("CAIF SPI driver"); | |
35 | ||
36 | static int spi_loop; | |
37 | module_param(spi_loop, bool, S_IRUGO); | |
38 | MODULE_PARM_DESC(spi_loop, "SPI running in loopback mode."); | |
39 | ||
40 | /* SPI frame alignment. */ | |
41 | module_param(spi_frm_align, int, S_IRUGO); | |
42 | MODULE_PARM_DESC(spi_frm_align, "SPI frame alignment."); | |
43 | ||
44 | /* SPI padding options. */ | |
45 | module_param(spi_up_head_align, int, S_IRUGO); | |
46 | MODULE_PARM_DESC(spi_up_head_align, "SPI uplink head alignment."); | |
47 | ||
48 | module_param(spi_up_tail_align, int, S_IRUGO); | |
49 | MODULE_PARM_DESC(spi_up_tail_align, "SPI uplink tail alignment."); | |
50 | ||
51 | module_param(spi_down_head_align, int, S_IRUGO); | |
52 | MODULE_PARM_DESC(spi_down_head_align, "SPI downlink head alignment."); | |
53 | ||
54 | module_param(spi_down_tail_align, int, S_IRUGO); | |
55 | MODULE_PARM_DESC(spi_down_tail_align, "SPI downlink tail alignment."); | |
56 | ||
57 | #ifdef CONFIG_ARM | |
58 | #define BYTE_HEX_FMT "%02X" | |
59 | #else | |
60 | #define BYTE_HEX_FMT "%02hhX" | |
61 | #endif | |
62 | ||
63 | #define SPI_MAX_PAYLOAD_SIZE 4096 | |
64 | /* | |
65 | * Threshold values for the SPI packet queue. Flowcontrol will be asserted | |
66 | * when the number of packets exceeds HIGH_WATER_MARK. It will not be | |
67 | * deasserted before the number of packets drops below LOW_WATER_MARK. | |
68 | */ | |
69 | #define LOW_WATER_MARK 100 | |
70 | #define HIGH_WATER_MARK (LOW_WATER_MARK*5) | |
71 | ||
72 | #ifdef CONFIG_UML | |
73 | ||
74 | /* | |
75 | * We sometimes use UML for debugging, but it cannot handle | |
76 | * dma_alloc_coherent so we have to wrap it. | |
77 | */ | |
78 | static inline void *dma_alloc(dma_addr_t *daddr) | |
79 | { | |
80 | return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL); | |
81 | } | |
82 | ||
83 | static inline void dma_free(void *cpu_addr, dma_addr_t handle) | |
84 | { | |
85 | kfree(cpu_addr); | |
86 | } | |
87 | ||
88 | #else | |
89 | ||
90 | static inline void *dma_alloc(dma_addr_t *daddr) | |
91 | { | |
92 | return dma_alloc_coherent(NULL, SPI_DMA_BUF_LEN, daddr, | |
93 | GFP_KERNEL); | |
94 | } | |
95 | ||
96 | static inline void dma_free(void *cpu_addr, dma_addr_t handle) | |
97 | { | |
98 | dma_free_coherent(NULL, SPI_DMA_BUF_LEN, cpu_addr, handle); | |
99 | } | |
100 | #endif /* CONFIG_UML */ | |
101 | ||
102 | #ifdef CONFIG_DEBUG_FS | |
103 | ||
104 | #define DEBUGFS_BUF_SIZE 4096 | |
105 | ||
106 | static struct dentry *dbgfs_root; | |
107 | ||
108 | static inline void driver_debugfs_create(void) | |
109 | { | |
110 | dbgfs_root = debugfs_create_dir(cfspi_spi_driver.driver.name, NULL); | |
111 | } | |
112 | ||
113 | static inline void driver_debugfs_remove(void) | |
114 | { | |
115 | debugfs_remove(dbgfs_root); | |
116 | } | |
117 | ||
118 | static inline void dev_debugfs_rem(struct cfspi *cfspi) | |
119 | { | |
120 | debugfs_remove(cfspi->dbgfs_frame); | |
121 | debugfs_remove(cfspi->dbgfs_state); | |
122 | debugfs_remove(cfspi->dbgfs_dir); | |
123 | } | |
124 | ||
125 | static int dbgfs_open(struct inode *inode, struct file *file) | |
126 | { | |
127 | file->private_data = inode->i_private; | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static ssize_t dbgfs_state(struct file *file, char __user *user_buf, | |
132 | size_t count, loff_t *ppos) | |
133 | { | |
134 | char *buf; | |
135 | int len = 0; | |
136 | ssize_t size; | |
cb8b6a93 | 137 | struct cfspi *cfspi = file->private_data; |
529d6dad SB |
138 | |
139 | buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); | |
140 | if (!buf) | |
141 | return 0; | |
142 | ||
143 | /* Print out debug information. */ | |
144 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
145 | "CAIF SPI debug information:\n"); | |
146 | ||
147 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), FLAVOR); | |
148 | ||
149 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
150 | "STATE: %d\n", cfspi->dbg_state); | |
151 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
152 | "Previous CMD: 0x%x\n", cfspi->pcmd); | |
153 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
154 | "Current CMD: 0x%x\n", cfspi->cmd); | |
155 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
156 | "Previous TX len: %d\n", cfspi->tx_ppck_len); | |
157 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
158 | "Previous RX len: %d\n", cfspi->rx_ppck_len); | |
159 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
160 | "Current TX len: %d\n", cfspi->tx_cpck_len); | |
161 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
162 | "Current RX len: %d\n", cfspi->rx_cpck_len); | |
163 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
164 | "Next TX len: %d\n", cfspi->tx_npck_len); | |
165 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
166 | "Next RX len: %d\n", cfspi->rx_npck_len); | |
167 | ||
7b7b0b90 DC |
168 | if (len > DEBUGFS_BUF_SIZE) |
169 | len = DEBUGFS_BUF_SIZE; | |
170 | ||
529d6dad SB |
171 | size = simple_read_from_buffer(user_buf, count, ppos, buf, len); |
172 | kfree(buf); | |
173 | ||
174 | return size; | |
175 | } | |
176 | ||
177 | static ssize_t print_frame(char *buf, size_t size, char *frm, | |
178 | size_t count, size_t cut) | |
179 | { | |
180 | int len = 0; | |
181 | int i; | |
182 | for (i = 0; i < count; i++) { | |
183 | len += snprintf((buf + len), (size - len), | |
184 | "[0x" BYTE_HEX_FMT "]", | |
185 | frm[i]); | |
186 | if ((i == cut) && (count > (cut * 2))) { | |
187 | /* Fast forward. */ | |
188 | i = count - cut; | |
189 | len += snprintf((buf + len), (size - len), | |
190 | "--- %u bytes skipped ---\n", | |
191 | (int)(count - (cut * 2))); | |
192 | } | |
193 | ||
194 | if ((!(i % 10)) && i) { | |
195 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
196 | "\n"); | |
197 | } | |
198 | } | |
199 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), "\n"); | |
200 | return len; | |
201 | } | |
202 | ||
203 | static ssize_t dbgfs_frame(struct file *file, char __user *user_buf, | |
204 | size_t count, loff_t *ppos) | |
205 | { | |
206 | char *buf; | |
207 | int len = 0; | |
208 | ssize_t size; | |
209 | struct cfspi *cfspi; | |
210 | ||
cb8b6a93 | 211 | cfspi = file->private_data; |
529d6dad SB |
212 | buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); |
213 | if (!buf) | |
214 | return 0; | |
215 | ||
216 | /* Print out debug information. */ | |
217 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
218 | "Current frame:\n"); | |
219 | ||
220 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
221 | "Tx data (Len: %d):\n", cfspi->tx_cpck_len); | |
222 | ||
223 | len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), | |
224 | cfspi->xfer.va_tx, | |
225 | (cfspi->tx_cpck_len + SPI_CMD_SZ), 100); | |
226 | ||
227 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
228 | "Rx data (Len: %d):\n", cfspi->rx_cpck_len); | |
229 | ||
230 | len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), | |
231 | cfspi->xfer.va_rx, | |
232 | (cfspi->rx_cpck_len + SPI_CMD_SZ), 100); | |
233 | ||
234 | size = simple_read_from_buffer(user_buf, count, ppos, buf, len); | |
235 | kfree(buf); | |
236 | ||
237 | return size; | |
238 | } | |
239 | ||
240 | static const struct file_operations dbgfs_state_fops = { | |
241 | .open = dbgfs_open, | |
242 | .read = dbgfs_state, | |
6038f373 AB |
243 | .owner = THIS_MODULE, |
244 | .llseek = default_llseek, | |
529d6dad SB |
245 | }; |
246 | ||
247 | static const struct file_operations dbgfs_frame_fops = { | |
248 | .open = dbgfs_open, | |
249 | .read = dbgfs_frame, | |
6038f373 AB |
250 | .owner = THIS_MODULE, |
251 | .llseek = default_llseek, | |
529d6dad SB |
252 | }; |
253 | ||
254 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
255 | { | |
256 | cfspi->dbgfs_dir = debugfs_create_dir(cfspi->pdev->name, dbgfs_root); | |
257 | cfspi->dbgfs_state = debugfs_create_file("state", S_IRUGO, | |
258 | cfspi->dbgfs_dir, cfspi, | |
259 | &dbgfs_state_fops); | |
260 | cfspi->dbgfs_frame = debugfs_create_file("frame", S_IRUGO, | |
261 | cfspi->dbgfs_dir, cfspi, | |
262 | &dbgfs_frame_fops); | |
263 | } | |
264 | ||
265 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
266 | { | |
267 | cfspi->dbg_state = state; | |
268 | }; | |
269 | #else | |
270 | ||
271 | static inline void driver_debugfs_create(void) | |
272 | { | |
273 | } | |
274 | ||
275 | static inline void driver_debugfs_remove(void) | |
276 | { | |
277 | } | |
278 | ||
279 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
280 | { | |
281 | } | |
282 | ||
283 | static inline void dev_debugfs_rem(struct cfspi *cfspi) | |
284 | { | |
285 | } | |
286 | ||
287 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
288 | { | |
289 | } | |
290 | #endif /* CONFIG_DEBUG_FS */ | |
291 | ||
292 | static LIST_HEAD(cfspi_list); | |
293 | static spinlock_t cfspi_list_lock; | |
294 | ||
295 | /* SPI uplink head alignment. */ | |
296 | static ssize_t show_up_head_align(struct device_driver *driver, char *buf) | |
297 | { | |
298 | return sprintf(buf, "%d\n", spi_up_head_align); | |
299 | } | |
300 | ||
301 | static DRIVER_ATTR(up_head_align, S_IRUSR, show_up_head_align, NULL); | |
302 | ||
303 | /* SPI uplink tail alignment. */ | |
304 | static ssize_t show_up_tail_align(struct device_driver *driver, char *buf) | |
305 | { | |
306 | return sprintf(buf, "%d\n", spi_up_tail_align); | |
307 | } | |
308 | ||
309 | static DRIVER_ATTR(up_tail_align, S_IRUSR, show_up_tail_align, NULL); | |
310 | ||
311 | /* SPI downlink head alignment. */ | |
312 | static ssize_t show_down_head_align(struct device_driver *driver, char *buf) | |
313 | { | |
314 | return sprintf(buf, "%d\n", spi_down_head_align); | |
315 | } | |
316 | ||
317 | static DRIVER_ATTR(down_head_align, S_IRUSR, show_down_head_align, NULL); | |
318 | ||
319 | /* SPI downlink tail alignment. */ | |
320 | static ssize_t show_down_tail_align(struct device_driver *driver, char *buf) | |
321 | { | |
322 | return sprintf(buf, "%d\n", spi_down_tail_align); | |
323 | } | |
324 | ||
325 | static DRIVER_ATTR(down_tail_align, S_IRUSR, show_down_tail_align, NULL); | |
326 | ||
327 | /* SPI frame alignment. */ | |
328 | static ssize_t show_frame_align(struct device_driver *driver, char *buf) | |
329 | { | |
330 | return sprintf(buf, "%d\n", spi_frm_align); | |
331 | } | |
332 | ||
333 | static DRIVER_ATTR(frame_align, S_IRUSR, show_frame_align, NULL); | |
334 | ||
335 | int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
336 | { | |
337 | u8 *dst = buf; | |
338 | caif_assert(buf); | |
339 | ||
340 | do { | |
341 | struct sk_buff *skb; | |
342 | struct caif_payload_info *info; | |
343 | int spad = 0; | |
344 | int epad; | |
345 | ||
346 | skb = skb_dequeue(&cfspi->chead); | |
347 | if (!skb) | |
348 | break; | |
349 | ||
350 | /* | |
351 | * Calculate length of frame including SPI padding. | |
352 | * The payload position is found in the control buffer. | |
353 | */ | |
354 | info = (struct caif_payload_info *)&skb->cb; | |
355 | ||
356 | /* | |
357 | * Compute head offset i.e. number of bytes to add to | |
358 | * get the start of the payload aligned. | |
359 | */ | |
360 | if (spi_up_head_align) { | |
361 | spad = 1 + ((info->hdr_len + 1) & spi_up_head_align); | |
362 | *dst = (u8)(spad - 1); | |
363 | dst += spad; | |
364 | } | |
365 | ||
366 | /* Copy in CAIF frame. */ | |
367 | skb_copy_bits(skb, 0, dst, skb->len); | |
368 | dst += skb->len; | |
369 | cfspi->ndev->stats.tx_packets++; | |
370 | cfspi->ndev->stats.tx_bytes += skb->len; | |
371 | ||
372 | /* | |
373 | * Compute tail offset i.e. number of bytes to add to | |
374 | * get the complete CAIF frame aligned. | |
375 | */ | |
376 | epad = (skb->len + spad) & spi_up_tail_align; | |
377 | dst += epad; | |
378 | ||
379 | dev_kfree_skb(skb); | |
380 | ||
381 | } while ((dst - buf) < len); | |
382 | ||
383 | return dst - buf; | |
384 | } | |
385 | ||
386 | int cfspi_xmitlen(struct cfspi *cfspi) | |
387 | { | |
388 | struct sk_buff *skb = NULL; | |
389 | int frm_len = 0; | |
390 | int pkts = 0; | |
391 | ||
392 | /* | |
393 | * Decommit previously commited frames. | |
394 | * skb_queue_splice_tail(&cfspi->chead,&cfspi->qhead) | |
395 | */ | |
396 | while (skb_peek(&cfspi->chead)) { | |
397 | skb = skb_dequeue_tail(&cfspi->chead); | |
398 | skb_queue_head(&cfspi->qhead, skb); | |
399 | } | |
400 | ||
401 | do { | |
402 | struct caif_payload_info *info = NULL; | |
403 | int spad = 0; | |
404 | int epad = 0; | |
405 | ||
406 | skb = skb_dequeue(&cfspi->qhead); | |
407 | if (!skb) | |
408 | break; | |
409 | ||
410 | /* | |
411 | * Calculate length of frame including SPI padding. | |
412 | * The payload position is found in the control buffer. | |
413 | */ | |
414 | info = (struct caif_payload_info *)&skb->cb; | |
415 | ||
416 | /* | |
417 | * Compute head offset i.e. number of bytes to add to | |
418 | * get the start of the payload aligned. | |
419 | */ | |
420 | if (spi_up_head_align) | |
421 | spad = 1 + ((info->hdr_len + 1) & spi_up_head_align); | |
422 | ||
423 | /* | |
424 | * Compute tail offset i.e. number of bytes to add to | |
425 | * get the complete CAIF frame aligned. | |
426 | */ | |
427 | epad = (skb->len + spad) & spi_up_tail_align; | |
428 | ||
429 | if ((skb->len + spad + epad + frm_len) <= CAIF_MAX_SPI_FRAME) { | |
430 | skb_queue_tail(&cfspi->chead, skb); | |
431 | pkts++; | |
432 | frm_len += skb->len + spad + epad; | |
433 | } else { | |
434 | /* Put back packet. */ | |
435 | skb_queue_head(&cfspi->qhead, skb); | |
436 | } | |
437 | } while (pkts <= CAIF_MAX_SPI_PKTS); | |
438 | ||
439 | /* | |
440 | * Send flow on if previously sent flow off | |
441 | * and now go below the low water mark | |
442 | */ | |
443 | if (cfspi->flow_off_sent && cfspi->qhead.qlen < cfspi->qd_low_mark && | |
444 | cfspi->cfdev.flowctrl) { | |
445 | cfspi->flow_off_sent = 0; | |
446 | cfspi->cfdev.flowctrl(cfspi->ndev, 1); | |
447 | } | |
448 | ||
449 | return frm_len; | |
450 | } | |
451 | ||
452 | static void cfspi_ss_cb(bool assert, struct cfspi_ifc *ifc) | |
453 | { | |
454 | struct cfspi *cfspi = (struct cfspi *)ifc->priv; | |
455 | ||
456 | if (!in_interrupt()) | |
457 | spin_lock(&cfspi->lock); | |
458 | if (assert) { | |
459 | set_bit(SPI_SS_ON, &cfspi->state); | |
460 | set_bit(SPI_XFER, &cfspi->state); | |
461 | } else { | |
462 | set_bit(SPI_SS_OFF, &cfspi->state); | |
463 | } | |
464 | if (!in_interrupt()) | |
465 | spin_unlock(&cfspi->lock); | |
466 | ||
467 | /* Wake up the xfer thread. */ | |
468 | wake_up_interruptible(&cfspi->wait); | |
469 | } | |
470 | ||
471 | static void cfspi_xfer_done_cb(struct cfspi_ifc *ifc) | |
472 | { | |
473 | struct cfspi *cfspi = (struct cfspi *)ifc->priv; | |
474 | ||
475 | /* Transfer done, complete work queue */ | |
476 | complete(&cfspi->comp); | |
477 | } | |
478 | ||
479 | static int cfspi_xmit(struct sk_buff *skb, struct net_device *dev) | |
480 | { | |
481 | struct cfspi *cfspi = NULL; | |
482 | unsigned long flags; | |
483 | if (!dev) | |
484 | return -EINVAL; | |
485 | ||
486 | cfspi = netdev_priv(dev); | |
487 | ||
488 | skb_queue_tail(&cfspi->qhead, skb); | |
489 | ||
490 | spin_lock_irqsave(&cfspi->lock, flags); | |
491 | if (!test_and_set_bit(SPI_XFER, &cfspi->state)) { | |
492 | /* Wake up xfer thread. */ | |
493 | wake_up_interruptible(&cfspi->wait); | |
494 | } | |
495 | spin_unlock_irqrestore(&cfspi->lock, flags); | |
496 | ||
497 | /* Send flow off if number of bytes is above high water mark */ | |
498 | if (!cfspi->flow_off_sent && | |
499 | cfspi->qhead.qlen > cfspi->qd_high_mark && | |
500 | cfspi->cfdev.flowctrl) { | |
501 | cfspi->flow_off_sent = 1; | |
502 | cfspi->cfdev.flowctrl(cfspi->ndev, 0); | |
503 | } | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
509 | { | |
510 | u8 *src = buf; | |
511 | ||
512 | caif_assert(buf != NULL); | |
513 | ||
514 | do { | |
515 | int res; | |
516 | struct sk_buff *skb = NULL; | |
517 | int spad = 0; | |
518 | int epad = 0; | |
519 | u8 *dst = NULL; | |
520 | int pkt_len = 0; | |
521 | ||
522 | /* | |
523 | * Compute head offset i.e. number of bytes added to | |
524 | * get the start of the payload aligned. | |
525 | */ | |
526 | if (spi_down_head_align) { | |
527 | spad = 1 + *src; | |
528 | src += spad; | |
529 | } | |
530 | ||
531 | /* Read length of CAIF frame (little endian). */ | |
532 | pkt_len = *src; | |
533 | pkt_len |= ((*(src+1)) << 8) & 0xFF00; | |
534 | pkt_len += 2; /* Add FCS fields. */ | |
535 | ||
536 | /* Get a suitable caif packet and copy in data. */ | |
537 | ||
538 | skb = netdev_alloc_skb(cfspi->ndev, pkt_len + 1); | |
539 | caif_assert(skb != NULL); | |
540 | ||
541 | dst = skb_put(skb, pkt_len); | |
542 | memcpy(dst, src, pkt_len); | |
543 | src += pkt_len; | |
544 | ||
545 | skb->protocol = htons(ETH_P_CAIF); | |
546 | skb_reset_mac_header(skb); | |
547 | skb->dev = cfspi->ndev; | |
548 | ||
549 | /* | |
550 | * Push received packet up the stack. | |
551 | */ | |
552 | if (!spi_loop) | |
553 | res = netif_rx_ni(skb); | |
554 | else | |
555 | res = cfspi_xmit(skb, cfspi->ndev); | |
556 | ||
557 | if (!res) { | |
558 | cfspi->ndev->stats.rx_packets++; | |
559 | cfspi->ndev->stats.rx_bytes += pkt_len; | |
560 | } else | |
561 | cfspi->ndev->stats.rx_dropped++; | |
562 | ||
563 | /* | |
564 | * Compute tail offset i.e. number of bytes added to | |
565 | * get the complete CAIF frame aligned. | |
566 | */ | |
567 | epad = (pkt_len + spad) & spi_down_tail_align; | |
568 | src += epad; | |
569 | } while ((src - buf) < len); | |
570 | ||
571 | return src - buf; | |
572 | } | |
573 | ||
574 | static int cfspi_open(struct net_device *dev) | |
575 | { | |
576 | netif_wake_queue(dev); | |
577 | return 0; | |
578 | } | |
579 | ||
580 | static int cfspi_close(struct net_device *dev) | |
581 | { | |
582 | netif_stop_queue(dev); | |
583 | return 0; | |
584 | } | |
585 | static const struct net_device_ops cfspi_ops = { | |
586 | .ndo_open = cfspi_open, | |
587 | .ndo_stop = cfspi_close, | |
588 | .ndo_start_xmit = cfspi_xmit | |
589 | }; | |
590 | ||
591 | static void cfspi_setup(struct net_device *dev) | |
592 | { | |
593 | struct cfspi *cfspi = netdev_priv(dev); | |
594 | dev->features = 0; | |
595 | dev->netdev_ops = &cfspi_ops; | |
596 | dev->type = ARPHRD_CAIF; | |
597 | dev->flags = IFF_NOARP | IFF_POINTOPOINT; | |
598 | dev->tx_queue_len = 0; | |
599 | dev->mtu = SPI_MAX_PAYLOAD_SIZE; | |
600 | dev->destructor = free_netdev; | |
601 | skb_queue_head_init(&cfspi->qhead); | |
602 | skb_queue_head_init(&cfspi->chead); | |
603 | cfspi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; | |
604 | cfspi->cfdev.use_frag = false; | |
605 | cfspi->cfdev.use_stx = false; | |
606 | cfspi->cfdev.use_fcs = false; | |
607 | cfspi->ndev = dev; | |
608 | } | |
609 | ||
610 | int cfspi_spi_probe(struct platform_device *pdev) | |
611 | { | |
612 | struct cfspi *cfspi = NULL; | |
613 | struct net_device *ndev; | |
614 | struct cfspi_dev *dev; | |
615 | int res; | |
616 | dev = (struct cfspi_dev *)pdev->dev.platform_data; | |
617 | ||
618 | ndev = alloc_netdev(sizeof(struct cfspi), | |
619 | "cfspi%d", cfspi_setup); | |
620 | if (!dev) | |
621 | return -ENODEV; | |
622 | ||
623 | cfspi = netdev_priv(ndev); | |
624 | netif_stop_queue(ndev); | |
625 | cfspi->ndev = ndev; | |
626 | cfspi->pdev = pdev; | |
627 | ||
628 | /* Set flow info */ | |
629 | cfspi->flow_off_sent = 0; | |
630 | cfspi->qd_low_mark = LOW_WATER_MARK; | |
631 | cfspi->qd_high_mark = HIGH_WATER_MARK; | |
632 | ||
633 | /* Assign the SPI device. */ | |
634 | cfspi->dev = dev; | |
635 | /* Assign the device ifc to this SPI interface. */ | |
636 | dev->ifc = &cfspi->ifc; | |
637 | ||
638 | /* Allocate DMA buffers. */ | |
639 | cfspi->xfer.va_tx = dma_alloc(&cfspi->xfer.pa_tx); | |
640 | if (!cfspi->xfer.va_tx) { | |
641 | printk(KERN_WARNING | |
642 | "CFSPI: failed to allocate dma TX buffer.\n"); | |
643 | res = -ENODEV; | |
644 | goto err_dma_alloc_tx; | |
645 | } | |
646 | ||
647 | cfspi->xfer.va_rx = dma_alloc(&cfspi->xfer.pa_rx); | |
648 | ||
649 | if (!cfspi->xfer.va_rx) { | |
650 | printk(KERN_WARNING | |
651 | "CFSPI: failed to allocate dma TX buffer.\n"); | |
652 | res = -ENODEV; | |
653 | goto err_dma_alloc_rx; | |
654 | } | |
655 | ||
656 | /* Initialize the work queue. */ | |
657 | INIT_WORK(&cfspi->work, cfspi_xfer); | |
658 | ||
659 | /* Initialize spin locks. */ | |
660 | spin_lock_init(&cfspi->lock); | |
661 | ||
662 | /* Initialize flow control state. */ | |
663 | cfspi->flow_stop = false; | |
664 | ||
665 | /* Initialize wait queue. */ | |
666 | init_waitqueue_head(&cfspi->wait); | |
667 | ||
668 | /* Create work thread. */ | |
669 | cfspi->wq = create_singlethread_workqueue(dev->name); | |
670 | if (!cfspi->wq) { | |
671 | printk(KERN_WARNING "CFSPI: failed to create work queue.\n"); | |
672 | res = -ENODEV; | |
673 | goto err_create_wq; | |
674 | } | |
675 | ||
676 | /* Initialize work queue. */ | |
677 | init_completion(&cfspi->comp); | |
678 | ||
679 | /* Create debugfs entries. */ | |
680 | dev_debugfs_add(cfspi); | |
681 | ||
682 | /* Set up the ifc. */ | |
683 | cfspi->ifc.ss_cb = cfspi_ss_cb; | |
684 | cfspi->ifc.xfer_done_cb = cfspi_xfer_done_cb; | |
685 | cfspi->ifc.priv = cfspi; | |
686 | ||
687 | /* Add CAIF SPI device to list. */ | |
688 | spin_lock(&cfspi_list_lock); | |
689 | list_add_tail(&cfspi->list, &cfspi_list); | |
690 | spin_unlock(&cfspi_list_lock); | |
691 | ||
692 | /* Schedule the work queue. */ | |
693 | queue_work(cfspi->wq, &cfspi->work); | |
694 | ||
695 | /* Register network device. */ | |
696 | res = register_netdev(ndev); | |
697 | if (res) { | |
698 | printk(KERN_ERR "CFSPI: Reg. error: %d.\n", res); | |
699 | goto err_net_reg; | |
700 | } | |
701 | return res; | |
702 | ||
703 | err_net_reg: | |
704 | dev_debugfs_rem(cfspi); | |
705 | set_bit(SPI_TERMINATE, &cfspi->state); | |
706 | wake_up_interruptible(&cfspi->wait); | |
707 | destroy_workqueue(cfspi->wq); | |
708 | err_create_wq: | |
709 | dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); | |
710 | err_dma_alloc_rx: | |
711 | dma_free(cfspi->xfer.va_tx, cfspi->xfer.pa_tx); | |
712 | err_dma_alloc_tx: | |
713 | free_netdev(ndev); | |
714 | ||
715 | return res; | |
716 | } | |
717 | ||
718 | int cfspi_spi_remove(struct platform_device *pdev) | |
719 | { | |
720 | struct list_head *list_node; | |
721 | struct list_head *n; | |
722 | struct cfspi *cfspi = NULL; | |
723 | struct cfspi_dev *dev; | |
724 | ||
725 | dev = (struct cfspi_dev *)pdev->dev.platform_data; | |
726 | spin_lock(&cfspi_list_lock); | |
727 | list_for_each_safe(list_node, n, &cfspi_list) { | |
728 | cfspi = list_entry(list_node, struct cfspi, list); | |
729 | /* Find the corresponding device. */ | |
730 | if (cfspi->dev == dev) { | |
731 | /* Remove from list. */ | |
732 | list_del(list_node); | |
733 | /* Free DMA buffers. */ | |
734 | dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); | |
735 | dma_free(cfspi->xfer.va_tx, cfspi->xfer.pa_tx); | |
736 | set_bit(SPI_TERMINATE, &cfspi->state); | |
737 | wake_up_interruptible(&cfspi->wait); | |
738 | destroy_workqueue(cfspi->wq); | |
739 | /* Destroy debugfs directory and files. */ | |
740 | dev_debugfs_rem(cfspi); | |
741 | unregister_netdev(cfspi->ndev); | |
742 | spin_unlock(&cfspi_list_lock); | |
743 | return 0; | |
744 | } | |
745 | } | |
746 | spin_unlock(&cfspi_list_lock); | |
747 | return -ENODEV; | |
748 | } | |
749 | ||
750 | static void __exit cfspi_exit_module(void) | |
751 | { | |
752 | struct list_head *list_node; | |
753 | struct list_head *n; | |
754 | struct cfspi *cfspi = NULL; | |
755 | ||
756 | list_for_each_safe(list_node, n, &cfspi_list) { | |
757 | cfspi = list_entry(list_node, struct cfspi, list); | |
758 | platform_device_unregister(cfspi->pdev); | |
759 | } | |
760 | ||
761 | /* Destroy sysfs files. */ | |
762 | driver_remove_file(&cfspi_spi_driver.driver, | |
763 | &driver_attr_up_head_align); | |
764 | driver_remove_file(&cfspi_spi_driver.driver, | |
765 | &driver_attr_up_tail_align); | |
766 | driver_remove_file(&cfspi_spi_driver.driver, | |
767 | &driver_attr_down_head_align); | |
768 | driver_remove_file(&cfspi_spi_driver.driver, | |
769 | &driver_attr_down_tail_align); | |
770 | driver_remove_file(&cfspi_spi_driver.driver, &driver_attr_frame_align); | |
771 | /* Unregister platform driver. */ | |
772 | platform_driver_unregister(&cfspi_spi_driver); | |
773 | /* Destroy debugfs root directory. */ | |
774 | driver_debugfs_remove(); | |
775 | } | |
776 | ||
777 | static int __init cfspi_init_module(void) | |
778 | { | |
779 | int result; | |
780 | ||
781 | /* Initialize spin lock. */ | |
782 | spin_lock_init(&cfspi_list_lock); | |
783 | ||
784 | /* Register platform driver. */ | |
785 | result = platform_driver_register(&cfspi_spi_driver); | |
786 | if (result) { | |
787 | printk(KERN_ERR "Could not register platform SPI driver.\n"); | |
788 | goto err_dev_register; | |
789 | } | |
790 | ||
791 | /* Create sysfs files. */ | |
792 | result = | |
793 | driver_create_file(&cfspi_spi_driver.driver, | |
794 | &driver_attr_up_head_align); | |
795 | if (result) { | |
796 | printk(KERN_ERR "Sysfs creation failed 1.\n"); | |
797 | goto err_create_up_head_align; | |
798 | } | |
799 | ||
800 | result = | |
801 | driver_create_file(&cfspi_spi_driver.driver, | |
802 | &driver_attr_up_tail_align); | |
803 | if (result) { | |
804 | printk(KERN_ERR "Sysfs creation failed 2.\n"); | |
805 | goto err_create_up_tail_align; | |
806 | } | |
807 | ||
808 | result = | |
809 | driver_create_file(&cfspi_spi_driver.driver, | |
810 | &driver_attr_down_head_align); | |
811 | if (result) { | |
812 | printk(KERN_ERR "Sysfs creation failed 3.\n"); | |
813 | goto err_create_down_head_align; | |
814 | } | |
815 | ||
816 | result = | |
817 | driver_create_file(&cfspi_spi_driver.driver, | |
818 | &driver_attr_down_tail_align); | |
819 | if (result) { | |
820 | printk(KERN_ERR "Sysfs creation failed 4.\n"); | |
821 | goto err_create_down_tail_align; | |
822 | } | |
823 | ||
824 | result = | |
825 | driver_create_file(&cfspi_spi_driver.driver, | |
826 | &driver_attr_frame_align); | |
827 | if (result) { | |
828 | printk(KERN_ERR "Sysfs creation failed 5.\n"); | |
829 | goto err_create_frame_align; | |
830 | } | |
831 | driver_debugfs_create(); | |
832 | return result; | |
833 | ||
834 | err_create_frame_align: | |
835 | driver_remove_file(&cfspi_spi_driver.driver, | |
836 | &driver_attr_down_tail_align); | |
837 | err_create_down_tail_align: | |
838 | driver_remove_file(&cfspi_spi_driver.driver, | |
839 | &driver_attr_down_head_align); | |
840 | err_create_down_head_align: | |
841 | driver_remove_file(&cfspi_spi_driver.driver, | |
842 | &driver_attr_up_tail_align); | |
843 | err_create_up_tail_align: | |
844 | driver_remove_file(&cfspi_spi_driver.driver, | |
845 | &driver_attr_up_head_align); | |
846 | err_create_up_head_align: | |
847 | err_dev_register: | |
848 | return result; | |
849 | } | |
850 | ||
851 | module_init(cfspi_init_module); | |
852 | module_exit(cfspi_exit_module); |