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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 | ||
2c24a5d1 SB |
36 | /* Returns the number of padding bytes for alignment. */ |
37 | #define PAD_POW2(x, pow) ((((x)&((pow)-1))==0) ? 0 : (((pow)-((x)&((pow)-1))))) | |
38 | ||
529d6dad SB |
39 | static int spi_loop; |
40 | module_param(spi_loop, bool, S_IRUGO); | |
41 | MODULE_PARM_DESC(spi_loop, "SPI running in loopback mode."); | |
42 | ||
43 | /* SPI frame alignment. */ | |
44 | module_param(spi_frm_align, int, S_IRUGO); | |
45 | MODULE_PARM_DESC(spi_frm_align, "SPI frame alignment."); | |
46 | ||
2c24a5d1 SB |
47 | /* |
48 | * SPI padding options. | |
49 | * Warning: must be a base of 2 (& operation used) and can not be zero ! | |
50 | */ | |
529d6dad SB |
51 | module_param(spi_up_head_align, int, S_IRUGO); |
52 | MODULE_PARM_DESC(spi_up_head_align, "SPI uplink head alignment."); | |
53 | ||
54 | module_param(spi_up_tail_align, int, S_IRUGO); | |
55 | MODULE_PARM_DESC(spi_up_tail_align, "SPI uplink tail alignment."); | |
56 | ||
57 | module_param(spi_down_head_align, int, S_IRUGO); | |
58 | MODULE_PARM_DESC(spi_down_head_align, "SPI downlink head alignment."); | |
59 | ||
60 | module_param(spi_down_tail_align, int, S_IRUGO); | |
61 | MODULE_PARM_DESC(spi_down_tail_align, "SPI downlink tail alignment."); | |
62 | ||
63 | #ifdef CONFIG_ARM | |
64 | #define BYTE_HEX_FMT "%02X" | |
65 | #else | |
66 | #define BYTE_HEX_FMT "%02hhX" | |
67 | #endif | |
68 | ||
69 | #define SPI_MAX_PAYLOAD_SIZE 4096 | |
70 | /* | |
71 | * Threshold values for the SPI packet queue. Flowcontrol will be asserted | |
72 | * when the number of packets exceeds HIGH_WATER_MARK. It will not be | |
73 | * deasserted before the number of packets drops below LOW_WATER_MARK. | |
74 | */ | |
75 | #define LOW_WATER_MARK 100 | |
76 | #define HIGH_WATER_MARK (LOW_WATER_MARK*5) | |
77 | ||
78 | #ifdef CONFIG_UML | |
79 | ||
80 | /* | |
81 | * We sometimes use UML for debugging, but it cannot handle | |
82 | * dma_alloc_coherent so we have to wrap it. | |
83 | */ | |
84 | static inline void *dma_alloc(dma_addr_t *daddr) | |
85 | { | |
86 | return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL); | |
87 | } | |
88 | ||
89 | static inline void dma_free(void *cpu_addr, dma_addr_t handle) | |
90 | { | |
91 | kfree(cpu_addr); | |
92 | } | |
93 | ||
94 | #else | |
95 | ||
96 | static inline void *dma_alloc(dma_addr_t *daddr) | |
97 | { | |
98 | return dma_alloc_coherent(NULL, SPI_DMA_BUF_LEN, daddr, | |
99 | GFP_KERNEL); | |
100 | } | |
101 | ||
102 | static inline void dma_free(void *cpu_addr, dma_addr_t handle) | |
103 | { | |
104 | dma_free_coherent(NULL, SPI_DMA_BUF_LEN, cpu_addr, handle); | |
105 | } | |
106 | #endif /* CONFIG_UML */ | |
107 | ||
108 | #ifdef CONFIG_DEBUG_FS | |
109 | ||
110 | #define DEBUGFS_BUF_SIZE 4096 | |
111 | ||
112 | static struct dentry *dbgfs_root; | |
113 | ||
114 | static inline void driver_debugfs_create(void) | |
115 | { | |
116 | dbgfs_root = debugfs_create_dir(cfspi_spi_driver.driver.name, NULL); | |
117 | } | |
118 | ||
119 | static inline void driver_debugfs_remove(void) | |
120 | { | |
121 | debugfs_remove(dbgfs_root); | |
122 | } | |
123 | ||
124 | static inline void dev_debugfs_rem(struct cfspi *cfspi) | |
125 | { | |
126 | debugfs_remove(cfspi->dbgfs_frame); | |
127 | debugfs_remove(cfspi->dbgfs_state); | |
128 | debugfs_remove(cfspi->dbgfs_dir); | |
129 | } | |
130 | ||
131 | static int dbgfs_open(struct inode *inode, struct file *file) | |
132 | { | |
133 | file->private_data = inode->i_private; | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static ssize_t dbgfs_state(struct file *file, char __user *user_buf, | |
138 | size_t count, loff_t *ppos) | |
139 | { | |
140 | char *buf; | |
141 | int len = 0; | |
142 | ssize_t size; | |
cb8b6a93 | 143 | struct cfspi *cfspi = file->private_data; |
529d6dad SB |
144 | |
145 | buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); | |
146 | if (!buf) | |
147 | return 0; | |
148 | ||
149 | /* Print out debug information. */ | |
150 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
151 | "CAIF SPI debug information:\n"); | |
152 | ||
153 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), FLAVOR); | |
154 | ||
155 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
156 | "STATE: %d\n", cfspi->dbg_state); | |
157 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
158 | "Previous CMD: 0x%x\n", cfspi->pcmd); | |
159 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
160 | "Current CMD: 0x%x\n", cfspi->cmd); | |
161 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
162 | "Previous TX len: %d\n", cfspi->tx_ppck_len); | |
163 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
164 | "Previous RX len: %d\n", cfspi->rx_ppck_len); | |
165 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
166 | "Current TX len: %d\n", cfspi->tx_cpck_len); | |
167 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
168 | "Current RX len: %d\n", cfspi->rx_cpck_len); | |
169 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
170 | "Next TX len: %d\n", cfspi->tx_npck_len); | |
171 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
172 | "Next RX len: %d\n", cfspi->rx_npck_len); | |
173 | ||
7b7b0b90 DC |
174 | if (len > DEBUGFS_BUF_SIZE) |
175 | len = DEBUGFS_BUF_SIZE; | |
176 | ||
529d6dad SB |
177 | size = simple_read_from_buffer(user_buf, count, ppos, buf, len); |
178 | kfree(buf); | |
179 | ||
180 | return size; | |
181 | } | |
182 | ||
183 | static ssize_t print_frame(char *buf, size_t size, char *frm, | |
184 | size_t count, size_t cut) | |
185 | { | |
186 | int len = 0; | |
187 | int i; | |
188 | for (i = 0; i < count; i++) { | |
189 | len += snprintf((buf + len), (size - len), | |
190 | "[0x" BYTE_HEX_FMT "]", | |
191 | frm[i]); | |
192 | if ((i == cut) && (count > (cut * 2))) { | |
193 | /* Fast forward. */ | |
194 | i = count - cut; | |
195 | len += snprintf((buf + len), (size - len), | |
196 | "--- %u bytes skipped ---\n", | |
197 | (int)(count - (cut * 2))); | |
198 | } | |
199 | ||
200 | if ((!(i % 10)) && i) { | |
201 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
202 | "\n"); | |
203 | } | |
204 | } | |
205 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), "\n"); | |
206 | return len; | |
207 | } | |
208 | ||
209 | static ssize_t dbgfs_frame(struct file *file, char __user *user_buf, | |
210 | size_t count, loff_t *ppos) | |
211 | { | |
212 | char *buf; | |
213 | int len = 0; | |
214 | ssize_t size; | |
215 | struct cfspi *cfspi; | |
216 | ||
cb8b6a93 | 217 | cfspi = file->private_data; |
529d6dad SB |
218 | buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); |
219 | if (!buf) | |
220 | return 0; | |
221 | ||
222 | /* Print out debug information. */ | |
223 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
224 | "Current frame:\n"); | |
225 | ||
226 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
227 | "Tx data (Len: %d):\n", cfspi->tx_cpck_len); | |
228 | ||
229 | len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), | |
230 | cfspi->xfer.va_tx, | |
231 | (cfspi->tx_cpck_len + SPI_CMD_SZ), 100); | |
232 | ||
233 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
234 | "Rx data (Len: %d):\n", cfspi->rx_cpck_len); | |
235 | ||
236 | len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), | |
237 | cfspi->xfer.va_rx, | |
238 | (cfspi->rx_cpck_len + SPI_CMD_SZ), 100); | |
239 | ||
240 | size = simple_read_from_buffer(user_buf, count, ppos, buf, len); | |
241 | kfree(buf); | |
242 | ||
243 | return size; | |
244 | } | |
245 | ||
246 | static const struct file_operations dbgfs_state_fops = { | |
247 | .open = dbgfs_open, | |
248 | .read = dbgfs_state, | |
2c24a5d1 | 249 | .owner = THIS_MODULE |
529d6dad SB |
250 | }; |
251 | ||
252 | static const struct file_operations dbgfs_frame_fops = { | |
253 | .open = dbgfs_open, | |
254 | .read = dbgfs_frame, | |
2c24a5d1 | 255 | .owner = THIS_MODULE |
529d6dad SB |
256 | }; |
257 | ||
258 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
259 | { | |
260 | cfspi->dbgfs_dir = debugfs_create_dir(cfspi->pdev->name, dbgfs_root); | |
261 | cfspi->dbgfs_state = debugfs_create_file("state", S_IRUGO, | |
262 | cfspi->dbgfs_dir, cfspi, | |
263 | &dbgfs_state_fops); | |
264 | cfspi->dbgfs_frame = debugfs_create_file("frame", S_IRUGO, | |
265 | cfspi->dbgfs_dir, cfspi, | |
266 | &dbgfs_frame_fops); | |
267 | } | |
268 | ||
269 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
270 | { | |
271 | cfspi->dbg_state = state; | |
272 | }; | |
273 | #else | |
274 | ||
275 | static inline void driver_debugfs_create(void) | |
276 | { | |
277 | } | |
278 | ||
279 | static inline void driver_debugfs_remove(void) | |
280 | { | |
281 | } | |
282 | ||
283 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
284 | { | |
285 | } | |
286 | ||
287 | static inline void dev_debugfs_rem(struct cfspi *cfspi) | |
288 | { | |
289 | } | |
290 | ||
291 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
292 | { | |
293 | } | |
294 | #endif /* CONFIG_DEBUG_FS */ | |
295 | ||
296 | static LIST_HEAD(cfspi_list); | |
297 | static spinlock_t cfspi_list_lock; | |
298 | ||
299 | /* SPI uplink head alignment. */ | |
300 | static ssize_t show_up_head_align(struct device_driver *driver, char *buf) | |
301 | { | |
302 | return sprintf(buf, "%d\n", spi_up_head_align); | |
303 | } | |
304 | ||
305 | static DRIVER_ATTR(up_head_align, S_IRUSR, show_up_head_align, NULL); | |
306 | ||
307 | /* SPI uplink tail alignment. */ | |
308 | static ssize_t show_up_tail_align(struct device_driver *driver, char *buf) | |
309 | { | |
310 | return sprintf(buf, "%d\n", spi_up_tail_align); | |
311 | } | |
312 | ||
313 | static DRIVER_ATTR(up_tail_align, S_IRUSR, show_up_tail_align, NULL); | |
314 | ||
315 | /* SPI downlink head alignment. */ | |
316 | static ssize_t show_down_head_align(struct device_driver *driver, char *buf) | |
317 | { | |
318 | return sprintf(buf, "%d\n", spi_down_head_align); | |
319 | } | |
320 | ||
321 | static DRIVER_ATTR(down_head_align, S_IRUSR, show_down_head_align, NULL); | |
322 | ||
323 | /* SPI downlink tail alignment. */ | |
324 | static ssize_t show_down_tail_align(struct device_driver *driver, char *buf) | |
325 | { | |
326 | return sprintf(buf, "%d\n", spi_down_tail_align); | |
327 | } | |
328 | ||
329 | static DRIVER_ATTR(down_tail_align, S_IRUSR, show_down_tail_align, NULL); | |
330 | ||
331 | /* SPI frame alignment. */ | |
332 | static ssize_t show_frame_align(struct device_driver *driver, char *buf) | |
333 | { | |
334 | return sprintf(buf, "%d\n", spi_frm_align); | |
335 | } | |
336 | ||
337 | static DRIVER_ATTR(frame_align, S_IRUSR, show_frame_align, NULL); | |
338 | ||
339 | int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
340 | { | |
341 | u8 *dst = buf; | |
342 | caif_assert(buf); | |
343 | ||
2c24a5d1 SB |
344 | if (cfspi->slave && !cfspi->slave_talked) |
345 | cfspi->slave_talked = true; | |
346 | ||
529d6dad SB |
347 | do { |
348 | struct sk_buff *skb; | |
349 | struct caif_payload_info *info; | |
350 | int spad = 0; | |
351 | int epad; | |
352 | ||
353 | skb = skb_dequeue(&cfspi->chead); | |
354 | if (!skb) | |
355 | break; | |
356 | ||
357 | /* | |
358 | * Calculate length of frame including SPI padding. | |
359 | * The payload position is found in the control buffer. | |
360 | */ | |
361 | info = (struct caif_payload_info *)&skb->cb; | |
362 | ||
363 | /* | |
364 | * Compute head offset i.e. number of bytes to add to | |
365 | * get the start of the payload aligned. | |
366 | */ | |
2c24a5d1 SB |
367 | if (spi_up_head_align > 1) { |
368 | spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); | |
529d6dad SB |
369 | *dst = (u8)(spad - 1); |
370 | dst += spad; | |
371 | } | |
372 | ||
373 | /* Copy in CAIF frame. */ | |
374 | skb_copy_bits(skb, 0, dst, skb->len); | |
375 | dst += skb->len; | |
376 | cfspi->ndev->stats.tx_packets++; | |
377 | cfspi->ndev->stats.tx_bytes += skb->len; | |
378 | ||
379 | /* | |
380 | * Compute tail offset i.e. number of bytes to add to | |
381 | * get the complete CAIF frame aligned. | |
382 | */ | |
2c24a5d1 | 383 | epad = PAD_POW2((skb->len + spad), spi_up_tail_align); |
529d6dad SB |
384 | dst += epad; |
385 | ||
386 | dev_kfree_skb(skb); | |
387 | ||
388 | } while ((dst - buf) < len); | |
389 | ||
390 | return dst - buf; | |
391 | } | |
392 | ||
393 | int cfspi_xmitlen(struct cfspi *cfspi) | |
394 | { | |
395 | struct sk_buff *skb = NULL; | |
396 | int frm_len = 0; | |
397 | int pkts = 0; | |
398 | ||
399 | /* | |
25985edc | 400 | * Decommit previously committed frames. |
529d6dad SB |
401 | * skb_queue_splice_tail(&cfspi->chead,&cfspi->qhead) |
402 | */ | |
403 | while (skb_peek(&cfspi->chead)) { | |
404 | skb = skb_dequeue_tail(&cfspi->chead); | |
405 | skb_queue_head(&cfspi->qhead, skb); | |
406 | } | |
407 | ||
408 | do { | |
409 | struct caif_payload_info *info = NULL; | |
410 | int spad = 0; | |
411 | int epad = 0; | |
412 | ||
413 | skb = skb_dequeue(&cfspi->qhead); | |
414 | if (!skb) | |
415 | break; | |
416 | ||
417 | /* | |
418 | * Calculate length of frame including SPI padding. | |
419 | * The payload position is found in the control buffer. | |
420 | */ | |
421 | info = (struct caif_payload_info *)&skb->cb; | |
422 | ||
423 | /* | |
424 | * Compute head offset i.e. number of bytes to add to | |
425 | * get the start of the payload aligned. | |
426 | */ | |
2c24a5d1 SB |
427 | if (spi_up_head_align > 1) |
428 | spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); | |
529d6dad SB |
429 | |
430 | /* | |
431 | * Compute tail offset i.e. number of bytes to add to | |
432 | * get the complete CAIF frame aligned. | |
433 | */ | |
2c24a5d1 | 434 | epad = PAD_POW2((skb->len + spad), spi_up_tail_align); |
529d6dad SB |
435 | |
436 | if ((skb->len + spad + epad + frm_len) <= CAIF_MAX_SPI_FRAME) { | |
437 | skb_queue_tail(&cfspi->chead, skb); | |
438 | pkts++; | |
439 | frm_len += skb->len + spad + epad; | |
440 | } else { | |
441 | /* Put back packet. */ | |
442 | skb_queue_head(&cfspi->qhead, skb); | |
2c24a5d1 | 443 | break; |
529d6dad SB |
444 | } |
445 | } while (pkts <= CAIF_MAX_SPI_PKTS); | |
446 | ||
447 | /* | |
448 | * Send flow on if previously sent flow off | |
449 | * and now go below the low water mark | |
450 | */ | |
451 | if (cfspi->flow_off_sent && cfspi->qhead.qlen < cfspi->qd_low_mark && | |
452 | cfspi->cfdev.flowctrl) { | |
453 | cfspi->flow_off_sent = 0; | |
454 | cfspi->cfdev.flowctrl(cfspi->ndev, 1); | |
455 | } | |
456 | ||
457 | return frm_len; | |
458 | } | |
459 | ||
460 | static void cfspi_ss_cb(bool assert, struct cfspi_ifc *ifc) | |
461 | { | |
462 | struct cfspi *cfspi = (struct cfspi *)ifc->priv; | |
463 | ||
2c24a5d1 SB |
464 | /* |
465 | * The slave device is the master on the link. Interrupts before the | |
466 | * slave has transmitted are considered spurious. | |
467 | */ | |
468 | if (cfspi->slave && !cfspi->slave_talked) { | |
469 | printk(KERN_WARNING "CFSPI: Spurious SS interrupt.\n"); | |
470 | return; | |
471 | } | |
472 | ||
529d6dad SB |
473 | if (!in_interrupt()) |
474 | spin_lock(&cfspi->lock); | |
475 | if (assert) { | |
476 | set_bit(SPI_SS_ON, &cfspi->state); | |
477 | set_bit(SPI_XFER, &cfspi->state); | |
478 | } else { | |
479 | set_bit(SPI_SS_OFF, &cfspi->state); | |
480 | } | |
481 | if (!in_interrupt()) | |
482 | spin_unlock(&cfspi->lock); | |
483 | ||
484 | /* Wake up the xfer thread. */ | |
2c24a5d1 SB |
485 | if (assert) |
486 | wake_up_interruptible(&cfspi->wait); | |
529d6dad SB |
487 | } |
488 | ||
489 | static void cfspi_xfer_done_cb(struct cfspi_ifc *ifc) | |
490 | { | |
491 | struct cfspi *cfspi = (struct cfspi *)ifc->priv; | |
492 | ||
493 | /* Transfer done, complete work queue */ | |
494 | complete(&cfspi->comp); | |
495 | } | |
496 | ||
497 | static int cfspi_xmit(struct sk_buff *skb, struct net_device *dev) | |
498 | { | |
499 | struct cfspi *cfspi = NULL; | |
500 | unsigned long flags; | |
501 | if (!dev) | |
502 | return -EINVAL; | |
503 | ||
504 | cfspi = netdev_priv(dev); | |
505 | ||
506 | skb_queue_tail(&cfspi->qhead, skb); | |
507 | ||
508 | spin_lock_irqsave(&cfspi->lock, flags); | |
509 | if (!test_and_set_bit(SPI_XFER, &cfspi->state)) { | |
510 | /* Wake up xfer thread. */ | |
511 | wake_up_interruptible(&cfspi->wait); | |
512 | } | |
513 | spin_unlock_irqrestore(&cfspi->lock, flags); | |
514 | ||
515 | /* Send flow off if number of bytes is above high water mark */ | |
516 | if (!cfspi->flow_off_sent && | |
517 | cfspi->qhead.qlen > cfspi->qd_high_mark && | |
518 | cfspi->cfdev.flowctrl) { | |
519 | cfspi->flow_off_sent = 1; | |
520 | cfspi->cfdev.flowctrl(cfspi->ndev, 0); | |
521 | } | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
527 | { | |
528 | u8 *src = buf; | |
529 | ||
530 | caif_assert(buf != NULL); | |
531 | ||
532 | do { | |
533 | int res; | |
534 | struct sk_buff *skb = NULL; | |
535 | int spad = 0; | |
536 | int epad = 0; | |
537 | u8 *dst = NULL; | |
538 | int pkt_len = 0; | |
539 | ||
540 | /* | |
541 | * Compute head offset i.e. number of bytes added to | |
542 | * get the start of the payload aligned. | |
543 | */ | |
2c24a5d1 | 544 | if (spi_down_head_align > 1) { |
529d6dad SB |
545 | spad = 1 + *src; |
546 | src += spad; | |
547 | } | |
548 | ||
549 | /* Read length of CAIF frame (little endian). */ | |
550 | pkt_len = *src; | |
551 | pkt_len |= ((*(src+1)) << 8) & 0xFF00; | |
552 | pkt_len += 2; /* Add FCS fields. */ | |
553 | ||
554 | /* Get a suitable caif packet and copy in data. */ | |
555 | ||
556 | skb = netdev_alloc_skb(cfspi->ndev, pkt_len + 1); | |
557 | caif_assert(skb != NULL); | |
558 | ||
559 | dst = skb_put(skb, pkt_len); | |
560 | memcpy(dst, src, pkt_len); | |
561 | src += pkt_len; | |
562 | ||
563 | skb->protocol = htons(ETH_P_CAIF); | |
564 | skb_reset_mac_header(skb); | |
565 | skb->dev = cfspi->ndev; | |
566 | ||
567 | /* | |
568 | * Push received packet up the stack. | |
569 | */ | |
570 | if (!spi_loop) | |
571 | res = netif_rx_ni(skb); | |
572 | else | |
573 | res = cfspi_xmit(skb, cfspi->ndev); | |
574 | ||
575 | if (!res) { | |
576 | cfspi->ndev->stats.rx_packets++; | |
577 | cfspi->ndev->stats.rx_bytes += pkt_len; | |
578 | } else | |
579 | cfspi->ndev->stats.rx_dropped++; | |
580 | ||
581 | /* | |
582 | * Compute tail offset i.e. number of bytes added to | |
583 | * get the complete CAIF frame aligned. | |
584 | */ | |
2c24a5d1 | 585 | epad = PAD_POW2((pkt_len + spad), spi_down_tail_align); |
529d6dad SB |
586 | src += epad; |
587 | } while ((src - buf) < len); | |
588 | ||
589 | return src - buf; | |
590 | } | |
591 | ||
592 | static int cfspi_open(struct net_device *dev) | |
593 | { | |
594 | netif_wake_queue(dev); | |
595 | return 0; | |
596 | } | |
597 | ||
598 | static int cfspi_close(struct net_device *dev) | |
599 | { | |
600 | netif_stop_queue(dev); | |
601 | return 0; | |
602 | } | |
603 | static const struct net_device_ops cfspi_ops = { | |
604 | .ndo_open = cfspi_open, | |
605 | .ndo_stop = cfspi_close, | |
606 | .ndo_start_xmit = cfspi_xmit | |
607 | }; | |
608 | ||
609 | static void cfspi_setup(struct net_device *dev) | |
610 | { | |
611 | struct cfspi *cfspi = netdev_priv(dev); | |
612 | dev->features = 0; | |
613 | dev->netdev_ops = &cfspi_ops; | |
614 | dev->type = ARPHRD_CAIF; | |
615 | dev->flags = IFF_NOARP | IFF_POINTOPOINT; | |
616 | dev->tx_queue_len = 0; | |
617 | dev->mtu = SPI_MAX_PAYLOAD_SIZE; | |
618 | dev->destructor = free_netdev; | |
619 | skb_queue_head_init(&cfspi->qhead); | |
620 | skb_queue_head_init(&cfspi->chead); | |
621 | cfspi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; | |
622 | cfspi->cfdev.use_frag = false; | |
623 | cfspi->cfdev.use_stx = false; | |
624 | cfspi->cfdev.use_fcs = false; | |
625 | cfspi->ndev = dev; | |
626 | } | |
627 | ||
628 | int cfspi_spi_probe(struct platform_device *pdev) | |
629 | { | |
630 | struct cfspi *cfspi = NULL; | |
631 | struct net_device *ndev; | |
632 | struct cfspi_dev *dev; | |
633 | int res; | |
634 | dev = (struct cfspi_dev *)pdev->dev.platform_data; | |
635 | ||
636 | ndev = alloc_netdev(sizeof(struct cfspi), | |
637 | "cfspi%d", cfspi_setup); | |
8ea91226 VK |
638 | if (!ndev) |
639 | return -ENOMEM; | |
529d6dad SB |
640 | |
641 | cfspi = netdev_priv(ndev); | |
642 | netif_stop_queue(ndev); | |
643 | cfspi->ndev = ndev; | |
644 | cfspi->pdev = pdev; | |
645 | ||
2c24a5d1 | 646 | /* Set flow info. */ |
529d6dad SB |
647 | cfspi->flow_off_sent = 0; |
648 | cfspi->qd_low_mark = LOW_WATER_MARK; | |
649 | cfspi->qd_high_mark = HIGH_WATER_MARK; | |
650 | ||
2c24a5d1 SB |
651 | /* Set slave info. */ |
652 | if (!strncmp(cfspi_spi_driver.driver.name, "cfspi_sspi", 10)) { | |
653 | cfspi->slave = true; | |
654 | cfspi->slave_talked = false; | |
655 | } else { | |
656 | cfspi->slave = false; | |
657 | cfspi->slave_talked = false; | |
658 | } | |
659 | ||
529d6dad SB |
660 | /* Assign the SPI device. */ |
661 | cfspi->dev = dev; | |
662 | /* Assign the device ifc to this SPI interface. */ | |
663 | dev->ifc = &cfspi->ifc; | |
664 | ||
665 | /* Allocate DMA buffers. */ | |
666 | cfspi->xfer.va_tx = dma_alloc(&cfspi->xfer.pa_tx); | |
667 | if (!cfspi->xfer.va_tx) { | |
668 | printk(KERN_WARNING | |
669 | "CFSPI: failed to allocate dma TX buffer.\n"); | |
670 | res = -ENODEV; | |
671 | goto err_dma_alloc_tx; | |
672 | } | |
673 | ||
674 | cfspi->xfer.va_rx = dma_alloc(&cfspi->xfer.pa_rx); | |
675 | ||
676 | if (!cfspi->xfer.va_rx) { | |
677 | printk(KERN_WARNING | |
678 | "CFSPI: failed to allocate dma TX buffer.\n"); | |
679 | res = -ENODEV; | |
680 | goto err_dma_alloc_rx; | |
681 | } | |
682 | ||
683 | /* Initialize the work queue. */ | |
684 | INIT_WORK(&cfspi->work, cfspi_xfer); | |
685 | ||
686 | /* Initialize spin locks. */ | |
687 | spin_lock_init(&cfspi->lock); | |
688 | ||
689 | /* Initialize flow control state. */ | |
690 | cfspi->flow_stop = false; | |
691 | ||
692 | /* Initialize wait queue. */ | |
693 | init_waitqueue_head(&cfspi->wait); | |
694 | ||
695 | /* Create work thread. */ | |
696 | cfspi->wq = create_singlethread_workqueue(dev->name); | |
697 | if (!cfspi->wq) { | |
698 | printk(KERN_WARNING "CFSPI: failed to create work queue.\n"); | |
699 | res = -ENODEV; | |
700 | goto err_create_wq; | |
701 | } | |
702 | ||
703 | /* Initialize work queue. */ | |
704 | init_completion(&cfspi->comp); | |
705 | ||
706 | /* Create debugfs entries. */ | |
707 | dev_debugfs_add(cfspi); | |
708 | ||
709 | /* Set up the ifc. */ | |
710 | cfspi->ifc.ss_cb = cfspi_ss_cb; | |
711 | cfspi->ifc.xfer_done_cb = cfspi_xfer_done_cb; | |
712 | cfspi->ifc.priv = cfspi; | |
713 | ||
714 | /* Add CAIF SPI device to list. */ | |
715 | spin_lock(&cfspi_list_lock); | |
716 | list_add_tail(&cfspi->list, &cfspi_list); | |
717 | spin_unlock(&cfspi_list_lock); | |
718 | ||
719 | /* Schedule the work queue. */ | |
720 | queue_work(cfspi->wq, &cfspi->work); | |
721 | ||
722 | /* Register network device. */ | |
723 | res = register_netdev(ndev); | |
724 | if (res) { | |
725 | printk(KERN_ERR "CFSPI: Reg. error: %d.\n", res); | |
726 | goto err_net_reg; | |
727 | } | |
728 | return res; | |
729 | ||
730 | err_net_reg: | |
731 | dev_debugfs_rem(cfspi); | |
732 | set_bit(SPI_TERMINATE, &cfspi->state); | |
733 | wake_up_interruptible(&cfspi->wait); | |
734 | destroy_workqueue(cfspi->wq); | |
735 | err_create_wq: | |
736 | dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); | |
737 | err_dma_alloc_rx: | |
738 | dma_free(cfspi->xfer.va_tx, cfspi->xfer.pa_tx); | |
739 | err_dma_alloc_tx: | |
740 | free_netdev(ndev); | |
741 | ||
742 | return res; | |
743 | } | |
744 | ||
745 | int cfspi_spi_remove(struct platform_device *pdev) | |
746 | { | |
747 | struct list_head *list_node; | |
748 | struct list_head *n; | |
749 | struct cfspi *cfspi = NULL; | |
750 | struct cfspi_dev *dev; | |
751 | ||
752 | dev = (struct cfspi_dev *)pdev->dev.platform_data; | |
753 | spin_lock(&cfspi_list_lock); | |
754 | list_for_each_safe(list_node, n, &cfspi_list) { | |
755 | cfspi = list_entry(list_node, struct cfspi, list); | |
756 | /* Find the corresponding device. */ | |
757 | if (cfspi->dev == dev) { | |
758 | /* Remove from list. */ | |
759 | list_del(list_node); | |
760 | /* Free DMA buffers. */ | |
761 | dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); | |
762 | dma_free(cfspi->xfer.va_tx, cfspi->xfer.pa_tx); | |
763 | set_bit(SPI_TERMINATE, &cfspi->state); | |
764 | wake_up_interruptible(&cfspi->wait); | |
765 | destroy_workqueue(cfspi->wq); | |
766 | /* Destroy debugfs directory and files. */ | |
767 | dev_debugfs_rem(cfspi); | |
768 | unregister_netdev(cfspi->ndev); | |
769 | spin_unlock(&cfspi_list_lock); | |
770 | return 0; | |
771 | } | |
772 | } | |
773 | spin_unlock(&cfspi_list_lock); | |
774 | return -ENODEV; | |
775 | } | |
776 | ||
777 | static void __exit cfspi_exit_module(void) | |
778 | { | |
779 | struct list_head *list_node; | |
780 | struct list_head *n; | |
781 | struct cfspi *cfspi = NULL; | |
782 | ||
783 | list_for_each_safe(list_node, n, &cfspi_list) { | |
784 | cfspi = list_entry(list_node, struct cfspi, list); | |
785 | platform_device_unregister(cfspi->pdev); | |
786 | } | |
787 | ||
788 | /* Destroy sysfs files. */ | |
789 | driver_remove_file(&cfspi_spi_driver.driver, | |
790 | &driver_attr_up_head_align); | |
791 | driver_remove_file(&cfspi_spi_driver.driver, | |
792 | &driver_attr_up_tail_align); | |
793 | driver_remove_file(&cfspi_spi_driver.driver, | |
794 | &driver_attr_down_head_align); | |
795 | driver_remove_file(&cfspi_spi_driver.driver, | |
796 | &driver_attr_down_tail_align); | |
797 | driver_remove_file(&cfspi_spi_driver.driver, &driver_attr_frame_align); | |
798 | /* Unregister platform driver. */ | |
799 | platform_driver_unregister(&cfspi_spi_driver); | |
800 | /* Destroy debugfs root directory. */ | |
801 | driver_debugfs_remove(); | |
802 | } | |
803 | ||
804 | static int __init cfspi_init_module(void) | |
805 | { | |
806 | int result; | |
807 | ||
808 | /* Initialize spin lock. */ | |
809 | spin_lock_init(&cfspi_list_lock); | |
810 | ||
811 | /* Register platform driver. */ | |
812 | result = platform_driver_register(&cfspi_spi_driver); | |
813 | if (result) { | |
814 | printk(KERN_ERR "Could not register platform SPI driver.\n"); | |
815 | goto err_dev_register; | |
816 | } | |
817 | ||
818 | /* Create sysfs files. */ | |
819 | result = | |
820 | driver_create_file(&cfspi_spi_driver.driver, | |
821 | &driver_attr_up_head_align); | |
822 | if (result) { | |
823 | printk(KERN_ERR "Sysfs creation failed 1.\n"); | |
824 | goto err_create_up_head_align; | |
825 | } | |
826 | ||
827 | result = | |
828 | driver_create_file(&cfspi_spi_driver.driver, | |
829 | &driver_attr_up_tail_align); | |
830 | if (result) { | |
831 | printk(KERN_ERR "Sysfs creation failed 2.\n"); | |
832 | goto err_create_up_tail_align; | |
833 | } | |
834 | ||
835 | result = | |
836 | driver_create_file(&cfspi_spi_driver.driver, | |
837 | &driver_attr_down_head_align); | |
838 | if (result) { | |
839 | printk(KERN_ERR "Sysfs creation failed 3.\n"); | |
840 | goto err_create_down_head_align; | |
841 | } | |
842 | ||
843 | result = | |
844 | driver_create_file(&cfspi_spi_driver.driver, | |
845 | &driver_attr_down_tail_align); | |
846 | if (result) { | |
847 | printk(KERN_ERR "Sysfs creation failed 4.\n"); | |
848 | goto err_create_down_tail_align; | |
849 | } | |
850 | ||
851 | result = | |
852 | driver_create_file(&cfspi_spi_driver.driver, | |
853 | &driver_attr_frame_align); | |
854 | if (result) { | |
855 | printk(KERN_ERR "Sysfs creation failed 5.\n"); | |
856 | goto err_create_frame_align; | |
857 | } | |
858 | driver_debugfs_create(); | |
859 | return result; | |
860 | ||
861 | err_create_frame_align: | |
862 | driver_remove_file(&cfspi_spi_driver.driver, | |
863 | &driver_attr_down_tail_align); | |
864 | err_create_down_tail_align: | |
865 | driver_remove_file(&cfspi_spi_driver.driver, | |
866 | &driver_attr_down_head_align); | |
867 | err_create_down_head_align: | |
868 | driver_remove_file(&cfspi_spi_driver.driver, | |
869 | &driver_attr_up_tail_align); | |
870 | err_create_up_tail_align: | |
871 | driver_remove_file(&cfspi_spi_driver.driver, | |
872 | &driver_attr_up_head_align); | |
873 | err_create_up_head_align: | |
874 | err_dev_register: | |
875 | return result; | |
876 | } | |
877 | ||
878 | module_init(cfspi_init_module); | |
879 | module_exit(cfspi_exit_module); |