Commit | Line | Data |
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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 | ||
529d6dad SB |
8 | #include <linux/init.h> |
9 | #include <linux/module.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/workqueue.h> | |
14 | #include <linux/completion.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/dma-mapping.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/debugfs.h> | |
21 | #include <linux/if_arp.h> | |
22 | #include <net/caif/caif_layer.h> | |
23 | #include <net/caif/caif_spi.h> | |
24 | ||
25 | #ifndef CONFIG_CAIF_SPI_SYNC | |
26 | #define FLAVOR "Flavour: Vanilla.\n" | |
27 | #else | |
28 | #define FLAVOR "Flavour: Master CMD&LEN at start.\n" | |
29 | #endif /* CONFIG_CAIF_SPI_SYNC */ | |
30 | ||
31 | MODULE_LICENSE("GPL"); | |
32 | MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>"); | |
33 | MODULE_DESCRIPTION("CAIF SPI driver"); | |
34 | ||
2c24a5d1 SB |
35 | /* Returns the number of padding bytes for alignment. */ |
36 | #define PAD_POW2(x, pow) ((((x)&((pow)-1))==0) ? 0 : (((pow)-((x)&((pow)-1))))) | |
37 | ||
eb939922 | 38 | static bool spi_loop; |
529d6dad SB |
39 | module_param(spi_loop, bool, S_IRUGO); |
40 | MODULE_PARM_DESC(spi_loop, "SPI running in loopback mode."); | |
41 | ||
42 | /* SPI frame alignment. */ | |
43 | module_param(spi_frm_align, int, S_IRUGO); | |
44 | MODULE_PARM_DESC(spi_frm_align, "SPI frame alignment."); | |
45 | ||
2c24a5d1 SB |
46 | /* |
47 | * SPI padding options. | |
48 | * Warning: must be a base of 2 (& operation used) and can not be zero ! | |
49 | */ | |
529d6dad SB |
50 | module_param(spi_up_head_align, int, S_IRUGO); |
51 | MODULE_PARM_DESC(spi_up_head_align, "SPI uplink head alignment."); | |
52 | ||
53 | module_param(spi_up_tail_align, int, S_IRUGO); | |
54 | MODULE_PARM_DESC(spi_up_tail_align, "SPI uplink tail alignment."); | |
55 | ||
56 | module_param(spi_down_head_align, int, S_IRUGO); | |
57 | MODULE_PARM_DESC(spi_down_head_align, "SPI downlink head alignment."); | |
58 | ||
59 | module_param(spi_down_tail_align, int, S_IRUGO); | |
60 | MODULE_PARM_DESC(spi_down_tail_align, "SPI downlink tail alignment."); | |
61 | ||
62 | #ifdef CONFIG_ARM | |
63 | #define BYTE_HEX_FMT "%02X" | |
64 | #else | |
65 | #define BYTE_HEX_FMT "%02hhX" | |
66 | #endif | |
67 | ||
68 | #define SPI_MAX_PAYLOAD_SIZE 4096 | |
69 | /* | |
70 | * Threshold values for the SPI packet queue. Flowcontrol will be asserted | |
71 | * when the number of packets exceeds HIGH_WATER_MARK. It will not be | |
72 | * deasserted before the number of packets drops below LOW_WATER_MARK. | |
73 | */ | |
74 | #define LOW_WATER_MARK 100 | |
75 | #define HIGH_WATER_MARK (LOW_WATER_MARK*5) | |
76 | ||
77 | #ifdef CONFIG_UML | |
78 | ||
79 | /* | |
80 | * We sometimes use UML for debugging, but it cannot handle | |
81 | * dma_alloc_coherent so we have to wrap it. | |
82 | */ | |
83 | static inline void *dma_alloc(dma_addr_t *daddr) | |
84 | { | |
85 | return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL); | |
86 | } | |
87 | ||
88 | static inline void dma_free(void *cpu_addr, dma_addr_t handle) | |
89 | { | |
90 | kfree(cpu_addr); | |
91 | } | |
92 | ||
93 | #else | |
94 | ||
95 | static inline void *dma_alloc(dma_addr_t *daddr) | |
96 | { | |
97 | return dma_alloc_coherent(NULL, SPI_DMA_BUF_LEN, daddr, | |
98 | GFP_KERNEL); | |
99 | } | |
100 | ||
101 | static inline void dma_free(void *cpu_addr, dma_addr_t handle) | |
102 | { | |
103 | dma_free_coherent(NULL, SPI_DMA_BUF_LEN, cpu_addr, handle); | |
104 | } | |
105 | #endif /* CONFIG_UML */ | |
106 | ||
107 | #ifdef CONFIG_DEBUG_FS | |
108 | ||
109 | #define DEBUGFS_BUF_SIZE 4096 | |
110 | ||
111 | static struct dentry *dbgfs_root; | |
112 | ||
113 | static inline void driver_debugfs_create(void) | |
114 | { | |
115 | dbgfs_root = debugfs_create_dir(cfspi_spi_driver.driver.name, NULL); | |
116 | } | |
117 | ||
118 | static inline void driver_debugfs_remove(void) | |
119 | { | |
120 | debugfs_remove(dbgfs_root); | |
121 | } | |
122 | ||
123 | static inline void dev_debugfs_rem(struct cfspi *cfspi) | |
124 | { | |
125 | debugfs_remove(cfspi->dbgfs_frame); | |
126 | debugfs_remove(cfspi->dbgfs_state); | |
127 | debugfs_remove(cfspi->dbgfs_dir); | |
128 | } | |
129 | ||
529d6dad SB |
130 | static ssize_t dbgfs_state(struct file *file, char __user *user_buf, |
131 | size_t count, loff_t *ppos) | |
132 | { | |
133 | char *buf; | |
134 | int len = 0; | |
135 | ssize_t size; | |
cb8b6a93 | 136 | struct cfspi *cfspi = file->private_data; |
529d6dad SB |
137 | |
138 | buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); | |
139 | if (!buf) | |
140 | return 0; | |
141 | ||
142 | /* Print out debug information. */ | |
143 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
144 | "CAIF SPI debug information:\n"); | |
145 | ||
146 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), FLAVOR); | |
147 | ||
148 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
149 | "STATE: %d\n", cfspi->dbg_state); | |
150 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
151 | "Previous CMD: 0x%x\n", cfspi->pcmd); | |
152 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
153 | "Current CMD: 0x%x\n", cfspi->cmd); | |
154 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
155 | "Previous TX len: %d\n", cfspi->tx_ppck_len); | |
156 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
157 | "Previous RX len: %d\n", cfspi->rx_ppck_len); | |
158 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
159 | "Current TX len: %d\n", cfspi->tx_cpck_len); | |
160 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
161 | "Current RX len: %d\n", cfspi->rx_cpck_len); | |
162 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
163 | "Next TX len: %d\n", cfspi->tx_npck_len); | |
164 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
165 | "Next RX len: %d\n", cfspi->rx_npck_len); | |
166 | ||
7b7b0b90 DC |
167 | if (len > DEBUGFS_BUF_SIZE) |
168 | len = DEBUGFS_BUF_SIZE; | |
169 | ||
529d6dad SB |
170 | size = simple_read_from_buffer(user_buf, count, ppos, buf, len); |
171 | kfree(buf); | |
172 | ||
173 | return size; | |
174 | } | |
175 | ||
176 | static ssize_t print_frame(char *buf, size_t size, char *frm, | |
177 | size_t count, size_t cut) | |
178 | { | |
179 | int len = 0; | |
180 | int i; | |
181 | for (i = 0; i < count; i++) { | |
182 | len += snprintf((buf + len), (size - len), | |
183 | "[0x" BYTE_HEX_FMT "]", | |
184 | frm[i]); | |
185 | if ((i == cut) && (count > (cut * 2))) { | |
186 | /* Fast forward. */ | |
187 | i = count - cut; | |
188 | len += snprintf((buf + len), (size - len), | |
189 | "--- %u bytes skipped ---\n", | |
190 | (int)(count - (cut * 2))); | |
191 | } | |
192 | ||
193 | if ((!(i % 10)) && i) { | |
194 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
195 | "\n"); | |
196 | } | |
197 | } | |
198 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), "\n"); | |
199 | return len; | |
200 | } | |
201 | ||
202 | static ssize_t dbgfs_frame(struct file *file, char __user *user_buf, | |
203 | size_t count, loff_t *ppos) | |
204 | { | |
205 | char *buf; | |
206 | int len = 0; | |
207 | ssize_t size; | |
208 | struct cfspi *cfspi; | |
209 | ||
cb8b6a93 | 210 | cfspi = file->private_data; |
529d6dad SB |
211 | buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); |
212 | if (!buf) | |
213 | return 0; | |
214 | ||
215 | /* Print out debug information. */ | |
216 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
217 | "Current frame:\n"); | |
218 | ||
219 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
220 | "Tx data (Len: %d):\n", cfspi->tx_cpck_len); | |
221 | ||
222 | len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), | |
d5f43c1e | 223 | cfspi->xfer.va_tx[0], |
529d6dad SB |
224 | (cfspi->tx_cpck_len + SPI_CMD_SZ), 100); |
225 | ||
226 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
227 | "Rx data (Len: %d):\n", cfspi->rx_cpck_len); | |
228 | ||
229 | len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), | |
230 | cfspi->xfer.va_rx, | |
231 | (cfspi->rx_cpck_len + SPI_CMD_SZ), 100); | |
232 | ||
233 | size = simple_read_from_buffer(user_buf, count, ppos, buf, len); | |
234 | kfree(buf); | |
235 | ||
236 | return size; | |
237 | } | |
238 | ||
239 | static const struct file_operations dbgfs_state_fops = { | |
234e3405 | 240 | .open = simple_open, |
529d6dad | 241 | .read = dbgfs_state, |
2c24a5d1 | 242 | .owner = THIS_MODULE |
529d6dad SB |
243 | }; |
244 | ||
245 | static const struct file_operations dbgfs_frame_fops = { | |
234e3405 | 246 | .open = simple_open, |
529d6dad | 247 | .read = dbgfs_frame, |
2c24a5d1 | 248 | .owner = THIS_MODULE |
529d6dad SB |
249 | }; |
250 | ||
251 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
252 | { | |
253 | cfspi->dbgfs_dir = debugfs_create_dir(cfspi->pdev->name, dbgfs_root); | |
254 | cfspi->dbgfs_state = debugfs_create_file("state", S_IRUGO, | |
255 | cfspi->dbgfs_dir, cfspi, | |
256 | &dbgfs_state_fops); | |
257 | cfspi->dbgfs_frame = debugfs_create_file("frame", S_IRUGO, | |
258 | cfspi->dbgfs_dir, cfspi, | |
259 | &dbgfs_frame_fops); | |
260 | } | |
261 | ||
262 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
263 | { | |
264 | cfspi->dbg_state = state; | |
265 | }; | |
266 | #else | |
267 | ||
268 | static inline void driver_debugfs_create(void) | |
269 | { | |
270 | } | |
271 | ||
272 | static inline void driver_debugfs_remove(void) | |
273 | { | |
274 | } | |
275 | ||
276 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
277 | { | |
278 | } | |
279 | ||
280 | static inline void dev_debugfs_rem(struct cfspi *cfspi) | |
281 | { | |
282 | } | |
283 | ||
284 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
285 | { | |
286 | } | |
287 | #endif /* CONFIG_DEBUG_FS */ | |
288 | ||
289 | static LIST_HEAD(cfspi_list); | |
290 | static spinlock_t cfspi_list_lock; | |
291 | ||
292 | /* SPI uplink head alignment. */ | |
293 | static ssize_t show_up_head_align(struct device_driver *driver, char *buf) | |
294 | { | |
295 | return sprintf(buf, "%d\n", spi_up_head_align); | |
296 | } | |
297 | ||
298 | static DRIVER_ATTR(up_head_align, S_IRUSR, show_up_head_align, NULL); | |
299 | ||
300 | /* SPI uplink tail alignment. */ | |
301 | static ssize_t show_up_tail_align(struct device_driver *driver, char *buf) | |
302 | { | |
303 | return sprintf(buf, "%d\n", spi_up_tail_align); | |
304 | } | |
305 | ||
306 | static DRIVER_ATTR(up_tail_align, S_IRUSR, show_up_tail_align, NULL); | |
307 | ||
308 | /* SPI downlink head alignment. */ | |
309 | static ssize_t show_down_head_align(struct device_driver *driver, char *buf) | |
310 | { | |
311 | return sprintf(buf, "%d\n", spi_down_head_align); | |
312 | } | |
313 | ||
314 | static DRIVER_ATTR(down_head_align, S_IRUSR, show_down_head_align, NULL); | |
315 | ||
316 | /* SPI downlink tail alignment. */ | |
317 | static ssize_t show_down_tail_align(struct device_driver *driver, char *buf) | |
318 | { | |
319 | return sprintf(buf, "%d\n", spi_down_tail_align); | |
320 | } | |
321 | ||
322 | static DRIVER_ATTR(down_tail_align, S_IRUSR, show_down_tail_align, NULL); | |
323 | ||
324 | /* SPI frame alignment. */ | |
325 | static ssize_t show_frame_align(struct device_driver *driver, char *buf) | |
326 | { | |
327 | return sprintf(buf, "%d\n", spi_frm_align); | |
328 | } | |
329 | ||
330 | static DRIVER_ATTR(frame_align, S_IRUSR, show_frame_align, NULL); | |
331 | ||
332 | int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
333 | { | |
334 | u8 *dst = buf; | |
335 | caif_assert(buf); | |
336 | ||
2c24a5d1 SB |
337 | if (cfspi->slave && !cfspi->slave_talked) |
338 | cfspi->slave_talked = true; | |
339 | ||
529d6dad SB |
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 | */ | |
2c24a5d1 SB |
360 | if (spi_up_head_align > 1) { |
361 | spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); | |
529d6dad SB |
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 | */ | |
2c24a5d1 | 376 | epad = PAD_POW2((skb->len + spad), spi_up_tail_align); |
529d6dad SB |
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 | /* | |
25985edc | 393 | * Decommit previously committed frames. |
529d6dad SB |
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 | */ | |
2c24a5d1 SB |
420 | if (spi_up_head_align > 1) |
421 | spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); | |
529d6dad SB |
422 | |
423 | /* | |
424 | * Compute tail offset i.e. number of bytes to add to | |
425 | * get the complete CAIF frame aligned. | |
426 | */ | |
2c24a5d1 | 427 | epad = PAD_POW2((skb->len + spad), spi_up_tail_align); |
529d6dad SB |
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); | |
2c24a5d1 | 436 | break; |
529d6dad SB |
437 | } |
438 | } while (pkts <= CAIF_MAX_SPI_PKTS); | |
439 | ||
440 | /* | |
441 | * Send flow on if previously sent flow off | |
442 | * and now go below the low water mark | |
443 | */ | |
444 | if (cfspi->flow_off_sent && cfspi->qhead.qlen < cfspi->qd_low_mark && | |
445 | cfspi->cfdev.flowctrl) { | |
446 | cfspi->flow_off_sent = 0; | |
447 | cfspi->cfdev.flowctrl(cfspi->ndev, 1); | |
448 | } | |
449 | ||
450 | return frm_len; | |
451 | } | |
452 | ||
453 | static void cfspi_ss_cb(bool assert, struct cfspi_ifc *ifc) | |
454 | { | |
455 | struct cfspi *cfspi = (struct cfspi *)ifc->priv; | |
456 | ||
2c24a5d1 SB |
457 | /* |
458 | * The slave device is the master on the link. Interrupts before the | |
459 | * slave has transmitted are considered spurious. | |
460 | */ | |
461 | if (cfspi->slave && !cfspi->slave_talked) { | |
462 | printk(KERN_WARNING "CFSPI: Spurious SS interrupt.\n"); | |
463 | return; | |
464 | } | |
465 | ||
529d6dad SB |
466 | if (!in_interrupt()) |
467 | spin_lock(&cfspi->lock); | |
468 | if (assert) { | |
469 | set_bit(SPI_SS_ON, &cfspi->state); | |
470 | set_bit(SPI_XFER, &cfspi->state); | |
471 | } else { | |
472 | set_bit(SPI_SS_OFF, &cfspi->state); | |
473 | } | |
474 | if (!in_interrupt()) | |
475 | spin_unlock(&cfspi->lock); | |
476 | ||
477 | /* Wake up the xfer thread. */ | |
2c24a5d1 SB |
478 | if (assert) |
479 | wake_up_interruptible(&cfspi->wait); | |
529d6dad SB |
480 | } |
481 | ||
482 | static void cfspi_xfer_done_cb(struct cfspi_ifc *ifc) | |
483 | { | |
484 | struct cfspi *cfspi = (struct cfspi *)ifc->priv; | |
485 | ||
486 | /* Transfer done, complete work queue */ | |
487 | complete(&cfspi->comp); | |
488 | } | |
489 | ||
490 | static int cfspi_xmit(struct sk_buff *skb, struct net_device *dev) | |
491 | { | |
492 | struct cfspi *cfspi = NULL; | |
493 | unsigned long flags; | |
494 | if (!dev) | |
495 | return -EINVAL; | |
496 | ||
497 | cfspi = netdev_priv(dev); | |
498 | ||
499 | skb_queue_tail(&cfspi->qhead, skb); | |
500 | ||
501 | spin_lock_irqsave(&cfspi->lock, flags); | |
502 | if (!test_and_set_bit(SPI_XFER, &cfspi->state)) { | |
503 | /* Wake up xfer thread. */ | |
504 | wake_up_interruptible(&cfspi->wait); | |
505 | } | |
506 | spin_unlock_irqrestore(&cfspi->lock, flags); | |
507 | ||
508 | /* Send flow off if number of bytes is above high water mark */ | |
509 | if (!cfspi->flow_off_sent && | |
510 | cfspi->qhead.qlen > cfspi->qd_high_mark && | |
511 | cfspi->cfdev.flowctrl) { | |
512 | cfspi->flow_off_sent = 1; | |
513 | cfspi->cfdev.flowctrl(cfspi->ndev, 0); | |
514 | } | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
520 | { | |
521 | u8 *src = buf; | |
522 | ||
523 | caif_assert(buf != NULL); | |
524 | ||
525 | do { | |
526 | int res; | |
527 | struct sk_buff *skb = NULL; | |
528 | int spad = 0; | |
529 | int epad = 0; | |
530 | u8 *dst = NULL; | |
531 | int pkt_len = 0; | |
532 | ||
533 | /* | |
534 | * Compute head offset i.e. number of bytes added to | |
535 | * get the start of the payload aligned. | |
536 | */ | |
2c24a5d1 | 537 | if (spi_down_head_align > 1) { |
529d6dad SB |
538 | spad = 1 + *src; |
539 | src += spad; | |
540 | } | |
541 | ||
542 | /* Read length of CAIF frame (little endian). */ | |
543 | pkt_len = *src; | |
544 | pkt_len |= ((*(src+1)) << 8) & 0xFF00; | |
545 | pkt_len += 2; /* Add FCS fields. */ | |
546 | ||
547 | /* Get a suitable caif packet and copy in data. */ | |
548 | ||
549 | skb = netdev_alloc_skb(cfspi->ndev, pkt_len + 1); | |
550 | caif_assert(skb != NULL); | |
551 | ||
552 | dst = skb_put(skb, pkt_len); | |
553 | memcpy(dst, src, pkt_len); | |
554 | src += pkt_len; | |
555 | ||
556 | skb->protocol = htons(ETH_P_CAIF); | |
557 | skb_reset_mac_header(skb); | |
558 | skb->dev = cfspi->ndev; | |
559 | ||
560 | /* | |
561 | * Push received packet up the stack. | |
562 | */ | |
563 | if (!spi_loop) | |
564 | res = netif_rx_ni(skb); | |
565 | else | |
566 | res = cfspi_xmit(skb, cfspi->ndev); | |
567 | ||
568 | if (!res) { | |
569 | cfspi->ndev->stats.rx_packets++; | |
570 | cfspi->ndev->stats.rx_bytes += pkt_len; | |
571 | } else | |
572 | cfspi->ndev->stats.rx_dropped++; | |
573 | ||
574 | /* | |
575 | * Compute tail offset i.e. number of bytes added to | |
576 | * get the complete CAIF frame aligned. | |
577 | */ | |
2c24a5d1 | 578 | epad = PAD_POW2((pkt_len + spad), spi_down_tail_align); |
529d6dad SB |
579 | src += epad; |
580 | } while ((src - buf) < len); | |
581 | ||
582 | return src - buf; | |
583 | } | |
584 | ||
585 | static int cfspi_open(struct net_device *dev) | |
586 | { | |
587 | netif_wake_queue(dev); | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static int cfspi_close(struct net_device *dev) | |
592 | { | |
593 | netif_stop_queue(dev); | |
594 | return 0; | |
595 | } | |
529d6dad | 596 | |
d5f43c1e | 597 | static int cfspi_init(struct net_device *dev) |
529d6dad | 598 | { |
d5f43c1e | 599 | int res = 0; |
529d6dad | 600 | struct cfspi *cfspi = netdev_priv(dev); |
529d6dad | 601 | |
2c24a5d1 | 602 | /* Set flow info. */ |
529d6dad SB |
603 | cfspi->flow_off_sent = 0; |
604 | cfspi->qd_low_mark = LOW_WATER_MARK; | |
605 | cfspi->qd_high_mark = HIGH_WATER_MARK; | |
606 | ||
2c24a5d1 SB |
607 | /* Set slave info. */ |
608 | if (!strncmp(cfspi_spi_driver.driver.name, "cfspi_sspi", 10)) { | |
609 | cfspi->slave = true; | |
610 | cfspi->slave_talked = false; | |
611 | } else { | |
612 | cfspi->slave = false; | |
613 | cfspi->slave_talked = false; | |
614 | } | |
615 | ||
529d6dad | 616 | /* Allocate DMA buffers. */ |
d5f43c1e EB |
617 | cfspi->xfer.va_tx[0] = dma_alloc(&cfspi->xfer.pa_tx[0]); |
618 | if (!cfspi->xfer.va_tx[0]) { | |
529d6dad | 619 | res = -ENODEV; |
d5f43c1e | 620 | goto err_dma_alloc_tx_0; |
529d6dad SB |
621 | } |
622 | ||
623 | cfspi->xfer.va_rx = dma_alloc(&cfspi->xfer.pa_rx); | |
624 | ||
625 | if (!cfspi->xfer.va_rx) { | |
529d6dad SB |
626 | res = -ENODEV; |
627 | goto err_dma_alloc_rx; | |
628 | } | |
629 | ||
630 | /* Initialize the work queue. */ | |
631 | INIT_WORK(&cfspi->work, cfspi_xfer); | |
632 | ||
633 | /* Initialize spin locks. */ | |
634 | spin_lock_init(&cfspi->lock); | |
635 | ||
636 | /* Initialize flow control state. */ | |
637 | cfspi->flow_stop = false; | |
638 | ||
639 | /* Initialize wait queue. */ | |
640 | init_waitqueue_head(&cfspi->wait); | |
641 | ||
642 | /* Create work thread. */ | |
643 | cfspi->wq = create_singlethread_workqueue(dev->name); | |
644 | if (!cfspi->wq) { | |
645 | printk(KERN_WARNING "CFSPI: failed to create work queue.\n"); | |
646 | res = -ENODEV; | |
647 | goto err_create_wq; | |
648 | } | |
649 | ||
650 | /* Initialize work queue. */ | |
651 | init_completion(&cfspi->comp); | |
652 | ||
653 | /* Create debugfs entries. */ | |
654 | dev_debugfs_add(cfspi); | |
655 | ||
656 | /* Set up the ifc. */ | |
657 | cfspi->ifc.ss_cb = cfspi_ss_cb; | |
658 | cfspi->ifc.xfer_done_cb = cfspi_xfer_done_cb; | |
659 | cfspi->ifc.priv = cfspi; | |
660 | ||
661 | /* Add CAIF SPI device to list. */ | |
662 | spin_lock(&cfspi_list_lock); | |
663 | list_add_tail(&cfspi->list, &cfspi_list); | |
664 | spin_unlock(&cfspi_list_lock); | |
665 | ||
666 | /* Schedule the work queue. */ | |
667 | queue_work(cfspi->wq, &cfspi->work); | |
668 | ||
d5f43c1e EB |
669 | return 0; |
670 | ||
671 | err_create_wq: | |
672 | dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); | |
673 | err_dma_alloc_rx: | |
674 | dma_free(cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); | |
675 | err_dma_alloc_tx_0: | |
676 | return res; | |
677 | } | |
678 | ||
679 | static void cfspi_uninit(struct net_device *dev) | |
680 | { | |
681 | struct cfspi *cfspi = netdev_priv(dev); | |
682 | ||
683 | /* Remove from list. */ | |
684 | spin_lock(&cfspi_list_lock); | |
685 | list_del(&cfspi->list); | |
686 | spin_unlock(&cfspi_list_lock); | |
687 | ||
688 | cfspi->ndev = NULL; | |
689 | /* Free DMA buffers. */ | |
690 | dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); | |
691 | dma_free(cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); | |
692 | set_bit(SPI_TERMINATE, &cfspi->state); | |
693 | wake_up_interruptible(&cfspi->wait); | |
694 | destroy_workqueue(cfspi->wq); | |
695 | /* Destroy debugfs directory and files. */ | |
696 | dev_debugfs_rem(cfspi); | |
697 | return; | |
698 | } | |
699 | ||
700 | static const struct net_device_ops cfspi_ops = { | |
701 | .ndo_open = cfspi_open, | |
702 | .ndo_stop = cfspi_close, | |
703 | .ndo_init = cfspi_init, | |
704 | .ndo_uninit = cfspi_uninit, | |
705 | .ndo_start_xmit = cfspi_xmit | |
706 | }; | |
707 | ||
708 | static void cfspi_setup(struct net_device *dev) | |
709 | { | |
710 | struct cfspi *cfspi = netdev_priv(dev); | |
711 | dev->features = 0; | |
712 | dev->netdev_ops = &cfspi_ops; | |
713 | dev->type = ARPHRD_CAIF; | |
714 | dev->flags = IFF_NOARP | IFF_POINTOPOINT; | |
715 | dev->tx_queue_len = 0; | |
716 | dev->mtu = SPI_MAX_PAYLOAD_SIZE; | |
717 | dev->destructor = free_netdev; | |
718 | skb_queue_head_init(&cfspi->qhead); | |
719 | skb_queue_head_init(&cfspi->chead); | |
720 | cfspi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; | |
721 | cfspi->cfdev.use_frag = false; | |
722 | cfspi->cfdev.use_stx = false; | |
723 | cfspi->cfdev.use_fcs = false; | |
724 | cfspi->ndev = dev; | |
725 | } | |
726 | ||
727 | int cfspi_spi_probe(struct platform_device *pdev) | |
728 | { | |
729 | struct cfspi *cfspi = NULL; | |
730 | struct net_device *ndev; | |
731 | struct cfspi_dev *dev; | |
732 | int res; | |
733 | dev = (struct cfspi_dev *)pdev->dev.platform_data; | |
734 | ||
735 | ndev = alloc_netdev(sizeof(struct cfspi), | |
736 | "cfspi%d", cfspi_setup); | |
737 | if (!dev) | |
738 | return -ENODEV; | |
739 | ||
740 | cfspi = netdev_priv(ndev); | |
741 | netif_stop_queue(ndev); | |
742 | cfspi->ndev = ndev; | |
743 | cfspi->pdev = pdev; | |
744 | ||
745 | /* Assign the SPI device. */ | |
746 | cfspi->dev = dev; | |
747 | /* Assign the device ifc to this SPI interface. */ | |
748 | dev->ifc = &cfspi->ifc; | |
749 | ||
529d6dad SB |
750 | /* Register network device. */ |
751 | res = register_netdev(ndev); | |
752 | if (res) { | |
753 | printk(KERN_ERR "CFSPI: Reg. error: %d.\n", res); | |
754 | goto err_net_reg; | |
755 | } | |
756 | return res; | |
757 | ||
758 | err_net_reg: | |
529d6dad SB |
759 | free_netdev(ndev); |
760 | ||
761 | return res; | |
762 | } | |
763 | ||
764 | int cfspi_spi_remove(struct platform_device *pdev) | |
765 | { | |
d5f43c1e EB |
766 | /* Everything is done in cfspi_uninit(). */ |
767 | return 0; | |
529d6dad SB |
768 | } |
769 | ||
770 | static void __exit cfspi_exit_module(void) | |
771 | { | |
772 | struct list_head *list_node; | |
773 | struct list_head *n; | |
774 | struct cfspi *cfspi = NULL; | |
775 | ||
776 | list_for_each_safe(list_node, n, &cfspi_list) { | |
777 | cfspi = list_entry(list_node, struct cfspi, list); | |
d5f43c1e | 778 | unregister_netdev(cfspi->ndev); |
529d6dad SB |
779 | } |
780 | ||
781 | /* Destroy sysfs files. */ | |
782 | driver_remove_file(&cfspi_spi_driver.driver, | |
783 | &driver_attr_up_head_align); | |
784 | driver_remove_file(&cfspi_spi_driver.driver, | |
785 | &driver_attr_up_tail_align); | |
786 | driver_remove_file(&cfspi_spi_driver.driver, | |
787 | &driver_attr_down_head_align); | |
788 | driver_remove_file(&cfspi_spi_driver.driver, | |
789 | &driver_attr_down_tail_align); | |
790 | driver_remove_file(&cfspi_spi_driver.driver, &driver_attr_frame_align); | |
791 | /* Unregister platform driver. */ | |
792 | platform_driver_unregister(&cfspi_spi_driver); | |
793 | /* Destroy debugfs root directory. */ | |
794 | driver_debugfs_remove(); | |
795 | } | |
796 | ||
797 | static int __init cfspi_init_module(void) | |
798 | { | |
799 | int result; | |
800 | ||
801 | /* Initialize spin lock. */ | |
802 | spin_lock_init(&cfspi_list_lock); | |
803 | ||
804 | /* Register platform driver. */ | |
805 | result = platform_driver_register(&cfspi_spi_driver); | |
806 | if (result) { | |
807 | printk(KERN_ERR "Could not register platform SPI driver.\n"); | |
808 | goto err_dev_register; | |
809 | } | |
810 | ||
811 | /* Create sysfs files. */ | |
812 | result = | |
813 | driver_create_file(&cfspi_spi_driver.driver, | |
814 | &driver_attr_up_head_align); | |
815 | if (result) { | |
816 | printk(KERN_ERR "Sysfs creation failed 1.\n"); | |
817 | goto err_create_up_head_align; | |
818 | } | |
819 | ||
820 | result = | |
821 | driver_create_file(&cfspi_spi_driver.driver, | |
822 | &driver_attr_up_tail_align); | |
823 | if (result) { | |
824 | printk(KERN_ERR "Sysfs creation failed 2.\n"); | |
825 | goto err_create_up_tail_align; | |
826 | } | |
827 | ||
828 | result = | |
829 | driver_create_file(&cfspi_spi_driver.driver, | |
830 | &driver_attr_down_head_align); | |
831 | if (result) { | |
832 | printk(KERN_ERR "Sysfs creation failed 3.\n"); | |
833 | goto err_create_down_head_align; | |
834 | } | |
835 | ||
836 | result = | |
837 | driver_create_file(&cfspi_spi_driver.driver, | |
838 | &driver_attr_down_tail_align); | |
839 | if (result) { | |
840 | printk(KERN_ERR "Sysfs creation failed 4.\n"); | |
841 | goto err_create_down_tail_align; | |
842 | } | |
843 | ||
844 | result = | |
845 | driver_create_file(&cfspi_spi_driver.driver, | |
846 | &driver_attr_frame_align); | |
847 | if (result) { | |
848 | printk(KERN_ERR "Sysfs creation failed 5.\n"); | |
849 | goto err_create_frame_align; | |
850 | } | |
851 | driver_debugfs_create(); | |
852 | return result; | |
853 | ||
854 | err_create_frame_align: | |
855 | driver_remove_file(&cfspi_spi_driver.driver, | |
856 | &driver_attr_down_tail_align); | |
857 | err_create_down_tail_align: | |
858 | driver_remove_file(&cfspi_spi_driver.driver, | |
859 | &driver_attr_down_head_align); | |
860 | err_create_down_head_align: | |
861 | driver_remove_file(&cfspi_spi_driver.driver, | |
862 | &driver_attr_up_tail_align); | |
863 | err_create_up_tail_align: | |
864 | driver_remove_file(&cfspi_spi_driver.driver, | |
865 | &driver_attr_up_head_align); | |
866 | err_create_up_head_align: | |
867 | err_dev_register: | |
868 | return result; | |
869 | } | |
870 | ||
871 | module_init(cfspi_init_module); | |
872 | module_exit(cfspi_exit_module); |