Commit | Line | Data |
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529d6dad SB |
1 | /* |
2 | * Copyright (C) ST-Ericsson AB 2010 | |
c2cd0a56 | 3 | * Author: Daniel Martensson |
529d6dad SB |
4 | * License terms: GNU General Public License (GPL) version 2. |
5 | */ | |
6 | ||
529d6dad SB |
7 | #include <linux/init.h> |
8 | #include <linux/module.h> | |
9 | #include <linux/device.h> | |
10 | #include <linux/platform_device.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/workqueue.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/list.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/debugfs.h> | |
20 | #include <linux/if_arp.h> | |
21 | #include <net/caif/caif_layer.h> | |
22 | #include <net/caif/caif_spi.h> | |
23 | ||
24 | #ifndef CONFIG_CAIF_SPI_SYNC | |
25 | #define FLAVOR "Flavour: Vanilla.\n" | |
26 | #else | |
27 | #define FLAVOR "Flavour: Master CMD&LEN at start.\n" | |
28 | #endif /* CONFIG_CAIF_SPI_SYNC */ | |
29 | ||
30 | MODULE_LICENSE("GPL"); | |
c2cd0a56 | 31 | MODULE_AUTHOR("Daniel Martensson"); |
529d6dad SB |
32 | MODULE_DESCRIPTION("CAIF SPI driver"); |
33 | ||
2c24a5d1 SB |
34 | /* Returns the number of padding bytes for alignment. */ |
35 | #define PAD_POW2(x, pow) ((((x)&((pow)-1))==0) ? 0 : (((pow)-((x)&((pow)-1))))) | |
36 | ||
eb939922 | 37 | static bool spi_loop; |
529d6dad SB |
38 | module_param(spi_loop, bool, S_IRUGO); |
39 | MODULE_PARM_DESC(spi_loop, "SPI running in loopback mode."); | |
40 | ||
41 | /* SPI frame alignment. */ | |
42 | module_param(spi_frm_align, int, S_IRUGO); | |
43 | MODULE_PARM_DESC(spi_frm_align, "SPI frame alignment."); | |
44 | ||
2c24a5d1 SB |
45 | /* |
46 | * SPI padding options. | |
47 | * Warning: must be a base of 2 (& operation used) and can not be zero ! | |
48 | */ | |
529d6dad SB |
49 | module_param(spi_up_head_align, int, S_IRUGO); |
50 | MODULE_PARM_DESC(spi_up_head_align, "SPI uplink head alignment."); | |
51 | ||
52 | module_param(spi_up_tail_align, int, S_IRUGO); | |
53 | MODULE_PARM_DESC(spi_up_tail_align, "SPI uplink tail alignment."); | |
54 | ||
55 | module_param(spi_down_head_align, int, S_IRUGO); | |
56 | MODULE_PARM_DESC(spi_down_head_align, "SPI downlink head alignment."); | |
57 | ||
58 | module_param(spi_down_tail_align, int, S_IRUGO); | |
59 | MODULE_PARM_DESC(spi_down_tail_align, "SPI downlink tail alignment."); | |
60 | ||
61 | #ifdef CONFIG_ARM | |
62 | #define BYTE_HEX_FMT "%02X" | |
63 | #else | |
64 | #define BYTE_HEX_FMT "%02hhX" | |
65 | #endif | |
66 | ||
67 | #define SPI_MAX_PAYLOAD_SIZE 4096 | |
68 | /* | |
69 | * Threshold values for the SPI packet queue. Flowcontrol will be asserted | |
70 | * when the number of packets exceeds HIGH_WATER_MARK. It will not be | |
71 | * deasserted before the number of packets drops below LOW_WATER_MARK. | |
72 | */ | |
73 | #define LOW_WATER_MARK 100 | |
74 | #define HIGH_WATER_MARK (LOW_WATER_MARK*5) | |
75 | ||
76 | #ifdef CONFIG_UML | |
77 | ||
78 | /* | |
79 | * We sometimes use UML for debugging, but it cannot handle | |
80 | * dma_alloc_coherent so we have to wrap it. | |
81 | */ | |
82 | static inline void *dma_alloc(dma_addr_t *daddr) | |
83 | { | |
84 | return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL); | |
85 | } | |
86 | ||
87 | static inline void dma_free(void *cpu_addr, dma_addr_t handle) | |
88 | { | |
89 | kfree(cpu_addr); | |
90 | } | |
91 | ||
92 | #else | |
93 | ||
94 | static inline void *dma_alloc(dma_addr_t *daddr) | |
95 | { | |
96 | return dma_alloc_coherent(NULL, SPI_DMA_BUF_LEN, daddr, | |
97 | GFP_KERNEL); | |
98 | } | |
99 | ||
100 | static inline void dma_free(void *cpu_addr, dma_addr_t handle) | |
101 | { | |
102 | dma_free_coherent(NULL, SPI_DMA_BUF_LEN, cpu_addr, handle); | |
103 | } | |
104 | #endif /* CONFIG_UML */ | |
105 | ||
106 | #ifdef CONFIG_DEBUG_FS | |
107 | ||
108 | #define DEBUGFS_BUF_SIZE 4096 | |
109 | ||
110 | static struct dentry *dbgfs_root; | |
111 | ||
112 | static inline void driver_debugfs_create(void) | |
113 | { | |
114 | dbgfs_root = debugfs_create_dir(cfspi_spi_driver.driver.name, NULL); | |
115 | } | |
116 | ||
117 | static inline void driver_debugfs_remove(void) | |
118 | { | |
119 | debugfs_remove(dbgfs_root); | |
120 | } | |
121 | ||
122 | static inline void dev_debugfs_rem(struct cfspi *cfspi) | |
123 | { | |
124 | debugfs_remove(cfspi->dbgfs_frame); | |
125 | debugfs_remove(cfspi->dbgfs_state); | |
126 | debugfs_remove(cfspi->dbgfs_dir); | |
127 | } | |
128 | ||
529d6dad SB |
129 | static ssize_t dbgfs_state(struct file *file, char __user *user_buf, |
130 | size_t count, loff_t *ppos) | |
131 | { | |
132 | char *buf; | |
133 | int len = 0; | |
134 | ssize_t size; | |
cb8b6a93 | 135 | struct cfspi *cfspi = file->private_data; |
529d6dad SB |
136 | |
137 | buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); | |
138 | if (!buf) | |
139 | return 0; | |
140 | ||
141 | /* Print out debug information. */ | |
142 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
143 | "CAIF SPI debug information:\n"); | |
144 | ||
145 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), FLAVOR); | |
146 | ||
147 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
148 | "STATE: %d\n", cfspi->dbg_state); | |
149 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
150 | "Previous CMD: 0x%x\n", cfspi->pcmd); | |
151 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
152 | "Current CMD: 0x%x\n", cfspi->cmd); | |
153 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
154 | "Previous TX len: %d\n", cfspi->tx_ppck_len); | |
155 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
156 | "Previous RX len: %d\n", cfspi->rx_ppck_len); | |
157 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
158 | "Current TX len: %d\n", cfspi->tx_cpck_len); | |
159 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
160 | "Current RX len: %d\n", cfspi->rx_cpck_len); | |
161 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
162 | "Next TX len: %d\n", cfspi->tx_npck_len); | |
163 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
164 | "Next RX len: %d\n", cfspi->rx_npck_len); | |
165 | ||
7b7b0b90 DC |
166 | if (len > DEBUGFS_BUF_SIZE) |
167 | len = DEBUGFS_BUF_SIZE; | |
168 | ||
529d6dad SB |
169 | size = simple_read_from_buffer(user_buf, count, ppos, buf, len); |
170 | kfree(buf); | |
171 | ||
172 | return size; | |
173 | } | |
174 | ||
175 | static ssize_t print_frame(char *buf, size_t size, char *frm, | |
176 | size_t count, size_t cut) | |
177 | { | |
178 | int len = 0; | |
179 | int i; | |
180 | for (i = 0; i < count; i++) { | |
181 | len += snprintf((buf + len), (size - len), | |
182 | "[0x" BYTE_HEX_FMT "]", | |
183 | frm[i]); | |
184 | if ((i == cut) && (count > (cut * 2))) { | |
185 | /* Fast forward. */ | |
186 | i = count - cut; | |
187 | len += snprintf((buf + len), (size - len), | |
188 | "--- %u bytes skipped ---\n", | |
189 | (int)(count - (cut * 2))); | |
190 | } | |
191 | ||
192 | if ((!(i % 10)) && i) { | |
193 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
194 | "\n"); | |
195 | } | |
196 | } | |
197 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), "\n"); | |
198 | return len; | |
199 | } | |
200 | ||
201 | static ssize_t dbgfs_frame(struct file *file, char __user *user_buf, | |
202 | size_t count, loff_t *ppos) | |
203 | { | |
204 | char *buf; | |
205 | int len = 0; | |
206 | ssize_t size; | |
207 | struct cfspi *cfspi; | |
208 | ||
cb8b6a93 | 209 | cfspi = file->private_data; |
529d6dad SB |
210 | buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL); |
211 | if (!buf) | |
212 | return 0; | |
213 | ||
214 | /* Print out debug information. */ | |
215 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
216 | "Current frame:\n"); | |
217 | ||
218 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
219 | "Tx data (Len: %d):\n", cfspi->tx_cpck_len); | |
220 | ||
221 | len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), | |
d5f43c1e | 222 | cfspi->xfer.va_tx[0], |
529d6dad SB |
223 | (cfspi->tx_cpck_len + SPI_CMD_SZ), 100); |
224 | ||
225 | len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), | |
226 | "Rx data (Len: %d):\n", cfspi->rx_cpck_len); | |
227 | ||
228 | len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len), | |
229 | cfspi->xfer.va_rx, | |
230 | (cfspi->rx_cpck_len + SPI_CMD_SZ), 100); | |
231 | ||
232 | size = simple_read_from_buffer(user_buf, count, ppos, buf, len); | |
233 | kfree(buf); | |
234 | ||
235 | return size; | |
236 | } | |
237 | ||
238 | static const struct file_operations dbgfs_state_fops = { | |
234e3405 | 239 | .open = simple_open, |
529d6dad | 240 | .read = dbgfs_state, |
2c24a5d1 | 241 | .owner = THIS_MODULE |
529d6dad SB |
242 | }; |
243 | ||
244 | static const struct file_operations dbgfs_frame_fops = { | |
234e3405 | 245 | .open = simple_open, |
529d6dad | 246 | .read = dbgfs_frame, |
2c24a5d1 | 247 | .owner = THIS_MODULE |
529d6dad SB |
248 | }; |
249 | ||
250 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
251 | { | |
252 | cfspi->dbgfs_dir = debugfs_create_dir(cfspi->pdev->name, dbgfs_root); | |
253 | cfspi->dbgfs_state = debugfs_create_file("state", S_IRUGO, | |
254 | cfspi->dbgfs_dir, cfspi, | |
255 | &dbgfs_state_fops); | |
256 | cfspi->dbgfs_frame = debugfs_create_file("frame", S_IRUGO, | |
257 | cfspi->dbgfs_dir, cfspi, | |
258 | &dbgfs_frame_fops); | |
259 | } | |
260 | ||
261 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
262 | { | |
263 | cfspi->dbg_state = state; | |
264 | }; | |
265 | #else | |
266 | ||
267 | static inline void driver_debugfs_create(void) | |
268 | { | |
269 | } | |
270 | ||
271 | static inline void driver_debugfs_remove(void) | |
272 | { | |
273 | } | |
274 | ||
275 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
276 | { | |
277 | } | |
278 | ||
279 | static inline void dev_debugfs_rem(struct cfspi *cfspi) | |
280 | { | |
281 | } | |
282 | ||
283 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
284 | { | |
285 | } | |
286 | #endif /* CONFIG_DEBUG_FS */ | |
287 | ||
288 | static LIST_HEAD(cfspi_list); | |
289 | static spinlock_t cfspi_list_lock; | |
290 | ||
291 | /* SPI uplink head alignment. */ | |
292 | static ssize_t show_up_head_align(struct device_driver *driver, char *buf) | |
293 | { | |
294 | return sprintf(buf, "%d\n", spi_up_head_align); | |
295 | } | |
296 | ||
297 | static DRIVER_ATTR(up_head_align, S_IRUSR, show_up_head_align, NULL); | |
298 | ||
299 | /* SPI uplink tail alignment. */ | |
300 | static ssize_t show_up_tail_align(struct device_driver *driver, char *buf) | |
301 | { | |
302 | return sprintf(buf, "%d\n", spi_up_tail_align); | |
303 | } | |
304 | ||
305 | static DRIVER_ATTR(up_tail_align, S_IRUSR, show_up_tail_align, NULL); | |
306 | ||
307 | /* SPI downlink head alignment. */ | |
308 | static ssize_t show_down_head_align(struct device_driver *driver, char *buf) | |
309 | { | |
310 | return sprintf(buf, "%d\n", spi_down_head_align); | |
311 | } | |
312 | ||
313 | static DRIVER_ATTR(down_head_align, S_IRUSR, show_down_head_align, NULL); | |
314 | ||
315 | /* SPI downlink tail alignment. */ | |
316 | static ssize_t show_down_tail_align(struct device_driver *driver, char *buf) | |
317 | { | |
318 | return sprintf(buf, "%d\n", spi_down_tail_align); | |
319 | } | |
320 | ||
321 | static DRIVER_ATTR(down_tail_align, S_IRUSR, show_down_tail_align, NULL); | |
322 | ||
323 | /* SPI frame alignment. */ | |
324 | static ssize_t show_frame_align(struct device_driver *driver, char *buf) | |
325 | { | |
326 | return sprintf(buf, "%d\n", spi_frm_align); | |
327 | } | |
328 | ||
329 | static DRIVER_ATTR(frame_align, S_IRUSR, show_frame_align, NULL); | |
330 | ||
331 | int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
332 | { | |
333 | u8 *dst = buf; | |
334 | caif_assert(buf); | |
335 | ||
2c24a5d1 SB |
336 | if (cfspi->slave && !cfspi->slave_talked) |
337 | cfspi->slave_talked = true; | |
338 | ||
529d6dad SB |
339 | do { |
340 | struct sk_buff *skb; | |
341 | struct caif_payload_info *info; | |
342 | int spad = 0; | |
343 | int epad; | |
344 | ||
345 | skb = skb_dequeue(&cfspi->chead); | |
346 | if (!skb) | |
347 | break; | |
348 | ||
349 | /* | |
350 | * Calculate length of frame including SPI padding. | |
351 | * The payload position is found in the control buffer. | |
352 | */ | |
353 | info = (struct caif_payload_info *)&skb->cb; | |
354 | ||
355 | /* | |
356 | * Compute head offset i.e. number of bytes to add to | |
357 | * get the start of the payload aligned. | |
358 | */ | |
2c24a5d1 SB |
359 | if (spi_up_head_align > 1) { |
360 | spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); | |
529d6dad SB |
361 | *dst = (u8)(spad - 1); |
362 | dst += spad; | |
363 | } | |
364 | ||
365 | /* Copy in CAIF frame. */ | |
366 | skb_copy_bits(skb, 0, dst, skb->len); | |
367 | dst += skb->len; | |
368 | cfspi->ndev->stats.tx_packets++; | |
369 | cfspi->ndev->stats.tx_bytes += skb->len; | |
370 | ||
371 | /* | |
372 | * Compute tail offset i.e. number of bytes to add to | |
373 | * get the complete CAIF frame aligned. | |
374 | */ | |
2c24a5d1 | 375 | epad = PAD_POW2((skb->len + spad), spi_up_tail_align); |
529d6dad SB |
376 | dst += epad; |
377 | ||
378 | dev_kfree_skb(skb); | |
379 | ||
380 | } while ((dst - buf) < len); | |
381 | ||
382 | return dst - buf; | |
383 | } | |
384 | ||
385 | int cfspi_xmitlen(struct cfspi *cfspi) | |
386 | { | |
387 | struct sk_buff *skb = NULL; | |
388 | int frm_len = 0; | |
389 | int pkts = 0; | |
390 | ||
391 | /* | |
25985edc | 392 | * Decommit previously committed frames. |
529d6dad SB |
393 | * skb_queue_splice_tail(&cfspi->chead,&cfspi->qhead) |
394 | */ | |
395 | while (skb_peek(&cfspi->chead)) { | |
396 | skb = skb_dequeue_tail(&cfspi->chead); | |
397 | skb_queue_head(&cfspi->qhead, skb); | |
398 | } | |
399 | ||
400 | do { | |
401 | struct caif_payload_info *info = NULL; | |
402 | int spad = 0; | |
403 | int epad = 0; | |
404 | ||
405 | skb = skb_dequeue(&cfspi->qhead); | |
406 | if (!skb) | |
407 | break; | |
408 | ||
409 | /* | |
410 | * Calculate length of frame including SPI padding. | |
411 | * The payload position is found in the control buffer. | |
412 | */ | |
413 | info = (struct caif_payload_info *)&skb->cb; | |
414 | ||
415 | /* | |
416 | * Compute head offset i.e. number of bytes to add to | |
417 | * get the start of the payload aligned. | |
418 | */ | |
2c24a5d1 SB |
419 | if (spi_up_head_align > 1) |
420 | spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); | |
529d6dad SB |
421 | |
422 | /* | |
423 | * Compute tail offset i.e. number of bytes to add to | |
424 | * get the complete CAIF frame aligned. | |
425 | */ | |
2c24a5d1 | 426 | epad = PAD_POW2((skb->len + spad), spi_up_tail_align); |
529d6dad SB |
427 | |
428 | if ((skb->len + spad + epad + frm_len) <= CAIF_MAX_SPI_FRAME) { | |
429 | skb_queue_tail(&cfspi->chead, skb); | |
430 | pkts++; | |
431 | frm_len += skb->len + spad + epad; | |
432 | } else { | |
433 | /* Put back packet. */ | |
434 | skb_queue_head(&cfspi->qhead, skb); | |
2c24a5d1 | 435 | break; |
529d6dad SB |
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 | ||
2c24a5d1 SB |
456 | /* |
457 | * The slave device is the master on the link. Interrupts before the | |
458 | * slave has transmitted are considered spurious. | |
459 | */ | |
460 | if (cfspi->slave && !cfspi->slave_talked) { | |
461 | printk(KERN_WARNING "CFSPI: Spurious SS interrupt.\n"); | |
462 | return; | |
463 | } | |
464 | ||
529d6dad SB |
465 | if (!in_interrupt()) |
466 | spin_lock(&cfspi->lock); | |
467 | if (assert) { | |
468 | set_bit(SPI_SS_ON, &cfspi->state); | |
469 | set_bit(SPI_XFER, &cfspi->state); | |
470 | } else { | |
471 | set_bit(SPI_SS_OFF, &cfspi->state); | |
472 | } | |
473 | if (!in_interrupt()) | |
474 | spin_unlock(&cfspi->lock); | |
475 | ||
476 | /* Wake up the xfer thread. */ | |
2c24a5d1 SB |
477 | if (assert) |
478 | wake_up_interruptible(&cfspi->wait); | |
529d6dad SB |
479 | } |
480 | ||
481 | static void cfspi_xfer_done_cb(struct cfspi_ifc *ifc) | |
482 | { | |
483 | struct cfspi *cfspi = (struct cfspi *)ifc->priv; | |
484 | ||
485 | /* Transfer done, complete work queue */ | |
486 | complete(&cfspi->comp); | |
487 | } | |
488 | ||
489 | static int cfspi_xmit(struct sk_buff *skb, struct net_device *dev) | |
490 | { | |
491 | struct cfspi *cfspi = NULL; | |
492 | unsigned long flags; | |
493 | if (!dev) | |
494 | return -EINVAL; | |
495 | ||
496 | cfspi = netdev_priv(dev); | |
497 | ||
498 | skb_queue_tail(&cfspi->qhead, skb); | |
499 | ||
500 | spin_lock_irqsave(&cfspi->lock, flags); | |
501 | if (!test_and_set_bit(SPI_XFER, &cfspi->state)) { | |
502 | /* Wake up xfer thread. */ | |
503 | wake_up_interruptible(&cfspi->wait); | |
504 | } | |
505 | spin_unlock_irqrestore(&cfspi->lock, flags); | |
506 | ||
507 | /* Send flow off if number of bytes is above high water mark */ | |
508 | if (!cfspi->flow_off_sent && | |
509 | cfspi->qhead.qlen > cfspi->qd_high_mark && | |
510 | cfspi->cfdev.flowctrl) { | |
511 | cfspi->flow_off_sent = 1; | |
512 | cfspi->cfdev.flowctrl(cfspi->ndev, 0); | |
513 | } | |
514 | ||
515 | return 0; | |
516 | } | |
517 | ||
518 | int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
519 | { | |
520 | u8 *src = buf; | |
521 | ||
522 | caif_assert(buf != NULL); | |
523 | ||
524 | do { | |
525 | int res; | |
526 | struct sk_buff *skb = NULL; | |
527 | int spad = 0; | |
528 | int epad = 0; | |
529 | u8 *dst = NULL; | |
530 | int pkt_len = 0; | |
531 | ||
532 | /* | |
533 | * Compute head offset i.e. number of bytes added to | |
534 | * get the start of the payload aligned. | |
535 | */ | |
2c24a5d1 | 536 | if (spi_down_head_align > 1) { |
529d6dad SB |
537 | spad = 1 + *src; |
538 | src += spad; | |
539 | } | |
540 | ||
541 | /* Read length of CAIF frame (little endian). */ | |
542 | pkt_len = *src; | |
543 | pkt_len |= ((*(src+1)) << 8) & 0xFF00; | |
544 | pkt_len += 2; /* Add FCS fields. */ | |
545 | ||
546 | /* Get a suitable caif packet and copy in data. */ | |
547 | ||
548 | skb = netdev_alloc_skb(cfspi->ndev, pkt_len + 1); | |
549 | caif_assert(skb != NULL); | |
550 | ||
551 | dst = skb_put(skb, pkt_len); | |
552 | memcpy(dst, src, pkt_len); | |
553 | src += pkt_len; | |
554 | ||
555 | skb->protocol = htons(ETH_P_CAIF); | |
556 | skb_reset_mac_header(skb); | |
529d6dad SB |
557 | |
558 | /* | |
559 | * Push received packet up the stack. | |
560 | */ | |
561 | if (!spi_loop) | |
562 | res = netif_rx_ni(skb); | |
563 | else | |
564 | res = cfspi_xmit(skb, cfspi->ndev); | |
565 | ||
566 | if (!res) { | |
567 | cfspi->ndev->stats.rx_packets++; | |
568 | cfspi->ndev->stats.rx_bytes += pkt_len; | |
569 | } else | |
570 | cfspi->ndev->stats.rx_dropped++; | |
571 | ||
572 | /* | |
573 | * Compute tail offset i.e. number of bytes added to | |
574 | * get the complete CAIF frame aligned. | |
575 | */ | |
2c24a5d1 | 576 | epad = PAD_POW2((pkt_len + spad), spi_down_tail_align); |
529d6dad SB |
577 | src += epad; |
578 | } while ((src - buf) < len); | |
579 | ||
580 | return src - buf; | |
581 | } | |
582 | ||
583 | static int cfspi_open(struct net_device *dev) | |
584 | { | |
585 | netif_wake_queue(dev); | |
586 | return 0; | |
587 | } | |
588 | ||
589 | static int cfspi_close(struct net_device *dev) | |
590 | { | |
591 | netif_stop_queue(dev); | |
592 | return 0; | |
593 | } | |
529d6dad | 594 | |
d5f43c1e | 595 | static int cfspi_init(struct net_device *dev) |
529d6dad | 596 | { |
d5f43c1e | 597 | int res = 0; |
529d6dad | 598 | struct cfspi *cfspi = netdev_priv(dev); |
529d6dad | 599 | |
2c24a5d1 | 600 | /* Set flow info. */ |
529d6dad SB |
601 | cfspi->flow_off_sent = 0; |
602 | cfspi->qd_low_mark = LOW_WATER_MARK; | |
603 | cfspi->qd_high_mark = HIGH_WATER_MARK; | |
604 | ||
2c24a5d1 SB |
605 | /* Set slave info. */ |
606 | if (!strncmp(cfspi_spi_driver.driver.name, "cfspi_sspi", 10)) { | |
607 | cfspi->slave = true; | |
608 | cfspi->slave_talked = false; | |
609 | } else { | |
610 | cfspi->slave = false; | |
611 | cfspi->slave_talked = false; | |
612 | } | |
613 | ||
529d6dad | 614 | /* Allocate DMA buffers. */ |
d5f43c1e EB |
615 | cfspi->xfer.va_tx[0] = dma_alloc(&cfspi->xfer.pa_tx[0]); |
616 | if (!cfspi->xfer.va_tx[0]) { | |
529d6dad | 617 | res = -ENODEV; |
d5f43c1e | 618 | goto err_dma_alloc_tx_0; |
529d6dad SB |
619 | } |
620 | ||
621 | cfspi->xfer.va_rx = dma_alloc(&cfspi->xfer.pa_rx); | |
622 | ||
623 | if (!cfspi->xfer.va_rx) { | |
529d6dad SB |
624 | res = -ENODEV; |
625 | goto err_dma_alloc_rx; | |
626 | } | |
627 | ||
628 | /* Initialize the work queue. */ | |
629 | INIT_WORK(&cfspi->work, cfspi_xfer); | |
630 | ||
631 | /* Initialize spin locks. */ | |
632 | spin_lock_init(&cfspi->lock); | |
633 | ||
634 | /* Initialize flow control state. */ | |
635 | cfspi->flow_stop = false; | |
636 | ||
637 | /* Initialize wait queue. */ | |
638 | init_waitqueue_head(&cfspi->wait); | |
639 | ||
640 | /* Create work thread. */ | |
641 | cfspi->wq = create_singlethread_workqueue(dev->name); | |
642 | if (!cfspi->wq) { | |
643 | printk(KERN_WARNING "CFSPI: failed to create work queue.\n"); | |
644 | res = -ENODEV; | |
645 | goto err_create_wq; | |
646 | } | |
647 | ||
648 | /* Initialize work queue. */ | |
649 | init_completion(&cfspi->comp); | |
650 | ||
651 | /* Create debugfs entries. */ | |
652 | dev_debugfs_add(cfspi); | |
653 | ||
654 | /* Set up the ifc. */ | |
655 | cfspi->ifc.ss_cb = cfspi_ss_cb; | |
656 | cfspi->ifc.xfer_done_cb = cfspi_xfer_done_cb; | |
657 | cfspi->ifc.priv = cfspi; | |
658 | ||
659 | /* Add CAIF SPI device to list. */ | |
660 | spin_lock(&cfspi_list_lock); | |
661 | list_add_tail(&cfspi->list, &cfspi_list); | |
662 | spin_unlock(&cfspi_list_lock); | |
663 | ||
664 | /* Schedule the work queue. */ | |
665 | queue_work(cfspi->wq, &cfspi->work); | |
666 | ||
d5f43c1e EB |
667 | return 0; |
668 | ||
669 | err_create_wq: | |
670 | dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); | |
671 | err_dma_alloc_rx: | |
672 | dma_free(cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); | |
673 | err_dma_alloc_tx_0: | |
674 | return res; | |
675 | } | |
676 | ||
677 | static void cfspi_uninit(struct net_device *dev) | |
678 | { | |
679 | struct cfspi *cfspi = netdev_priv(dev); | |
680 | ||
681 | /* Remove from list. */ | |
682 | spin_lock(&cfspi_list_lock); | |
683 | list_del(&cfspi->list); | |
684 | spin_unlock(&cfspi_list_lock); | |
685 | ||
686 | cfspi->ndev = NULL; | |
687 | /* Free DMA buffers. */ | |
688 | dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx); | |
689 | dma_free(cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); | |
690 | set_bit(SPI_TERMINATE, &cfspi->state); | |
691 | wake_up_interruptible(&cfspi->wait); | |
692 | destroy_workqueue(cfspi->wq); | |
693 | /* Destroy debugfs directory and files. */ | |
694 | dev_debugfs_rem(cfspi); | |
695 | return; | |
696 | } | |
697 | ||
698 | static const struct net_device_ops cfspi_ops = { | |
699 | .ndo_open = cfspi_open, | |
700 | .ndo_stop = cfspi_close, | |
701 | .ndo_init = cfspi_init, | |
702 | .ndo_uninit = cfspi_uninit, | |
703 | .ndo_start_xmit = cfspi_xmit | |
704 | }; | |
705 | ||
706 | static void cfspi_setup(struct net_device *dev) | |
707 | { | |
708 | struct cfspi *cfspi = netdev_priv(dev); | |
709 | dev->features = 0; | |
710 | dev->netdev_ops = &cfspi_ops; | |
711 | dev->type = ARPHRD_CAIF; | |
712 | dev->flags = IFF_NOARP | IFF_POINTOPOINT; | |
713 | dev->tx_queue_len = 0; | |
714 | dev->mtu = SPI_MAX_PAYLOAD_SIZE; | |
715 | dev->destructor = free_netdev; | |
716 | skb_queue_head_init(&cfspi->qhead); | |
717 | skb_queue_head_init(&cfspi->chead); | |
718 | cfspi->cfdev.link_select = CAIF_LINK_HIGH_BANDW; | |
719 | cfspi->cfdev.use_frag = false; | |
720 | cfspi->cfdev.use_stx = false; | |
721 | cfspi->cfdev.use_fcs = false; | |
722 | cfspi->ndev = dev; | |
723 | } | |
724 | ||
725 | int cfspi_spi_probe(struct platform_device *pdev) | |
726 | { | |
727 | struct cfspi *cfspi = NULL; | |
728 | struct net_device *ndev; | |
729 | struct cfspi_dev *dev; | |
730 | int res; | |
731 | dev = (struct cfspi_dev *)pdev->dev.platform_data; | |
732 | ||
c835a677 TG |
733 | ndev = alloc_netdev(sizeof(struct cfspi), "cfspi%d", |
734 | NET_NAME_UNKNOWN, cfspi_setup); | |
d5f43c1e EB |
735 | if (!dev) |
736 | return -ENODEV; | |
737 | ||
738 | cfspi = netdev_priv(ndev); | |
739 | netif_stop_queue(ndev); | |
740 | cfspi->ndev = ndev; | |
741 | cfspi->pdev = pdev; | |
742 | ||
743 | /* Assign the SPI device. */ | |
744 | cfspi->dev = dev; | |
745 | /* Assign the device ifc to this SPI interface. */ | |
746 | dev->ifc = &cfspi->ifc; | |
747 | ||
529d6dad SB |
748 | /* Register network device. */ |
749 | res = register_netdev(ndev); | |
750 | if (res) { | |
751 | printk(KERN_ERR "CFSPI: Reg. error: %d.\n", res); | |
752 | goto err_net_reg; | |
753 | } | |
754 | return res; | |
755 | ||
756 | err_net_reg: | |
529d6dad SB |
757 | free_netdev(ndev); |
758 | ||
759 | return res; | |
760 | } | |
761 | ||
762 | int cfspi_spi_remove(struct platform_device *pdev) | |
763 | { | |
d5f43c1e EB |
764 | /* Everything is done in cfspi_uninit(). */ |
765 | return 0; | |
529d6dad SB |
766 | } |
767 | ||
768 | static void __exit cfspi_exit_module(void) | |
769 | { | |
770 | struct list_head *list_node; | |
771 | struct list_head *n; | |
772 | struct cfspi *cfspi = NULL; | |
773 | ||
774 | list_for_each_safe(list_node, n, &cfspi_list) { | |
775 | cfspi = list_entry(list_node, struct cfspi, list); | |
d5f43c1e | 776 | unregister_netdev(cfspi->ndev); |
529d6dad SB |
777 | } |
778 | ||
779 | /* Destroy sysfs files. */ | |
780 | driver_remove_file(&cfspi_spi_driver.driver, | |
781 | &driver_attr_up_head_align); | |
782 | driver_remove_file(&cfspi_spi_driver.driver, | |
783 | &driver_attr_up_tail_align); | |
784 | driver_remove_file(&cfspi_spi_driver.driver, | |
785 | &driver_attr_down_head_align); | |
786 | driver_remove_file(&cfspi_spi_driver.driver, | |
787 | &driver_attr_down_tail_align); | |
788 | driver_remove_file(&cfspi_spi_driver.driver, &driver_attr_frame_align); | |
789 | /* Unregister platform driver. */ | |
790 | platform_driver_unregister(&cfspi_spi_driver); | |
791 | /* Destroy debugfs root directory. */ | |
792 | driver_debugfs_remove(); | |
793 | } | |
794 | ||
795 | static int __init cfspi_init_module(void) | |
796 | { | |
797 | int result; | |
798 | ||
799 | /* Initialize spin lock. */ | |
800 | spin_lock_init(&cfspi_list_lock); | |
801 | ||
802 | /* Register platform driver. */ | |
803 | result = platform_driver_register(&cfspi_spi_driver); | |
804 | if (result) { | |
805 | printk(KERN_ERR "Could not register platform SPI driver.\n"); | |
806 | goto err_dev_register; | |
807 | } | |
808 | ||
809 | /* Create sysfs files. */ | |
810 | result = | |
811 | driver_create_file(&cfspi_spi_driver.driver, | |
812 | &driver_attr_up_head_align); | |
813 | if (result) { | |
814 | printk(KERN_ERR "Sysfs creation failed 1.\n"); | |
815 | goto err_create_up_head_align; | |
816 | } | |
817 | ||
818 | result = | |
819 | driver_create_file(&cfspi_spi_driver.driver, | |
820 | &driver_attr_up_tail_align); | |
821 | if (result) { | |
822 | printk(KERN_ERR "Sysfs creation failed 2.\n"); | |
823 | goto err_create_up_tail_align; | |
824 | } | |
825 | ||
826 | result = | |
827 | driver_create_file(&cfspi_spi_driver.driver, | |
828 | &driver_attr_down_head_align); | |
829 | if (result) { | |
830 | printk(KERN_ERR "Sysfs creation failed 3.\n"); | |
831 | goto err_create_down_head_align; | |
832 | } | |
833 | ||
834 | result = | |
835 | driver_create_file(&cfspi_spi_driver.driver, | |
836 | &driver_attr_down_tail_align); | |
837 | if (result) { | |
838 | printk(KERN_ERR "Sysfs creation failed 4.\n"); | |
839 | goto err_create_down_tail_align; | |
840 | } | |
841 | ||
842 | result = | |
843 | driver_create_file(&cfspi_spi_driver.driver, | |
844 | &driver_attr_frame_align); | |
845 | if (result) { | |
846 | printk(KERN_ERR "Sysfs creation failed 5.\n"); | |
847 | goto err_create_frame_align; | |
848 | } | |
849 | driver_debugfs_create(); | |
850 | return result; | |
851 | ||
852 | err_create_frame_align: | |
853 | driver_remove_file(&cfspi_spi_driver.driver, | |
854 | &driver_attr_down_tail_align); | |
855 | err_create_down_tail_align: | |
856 | driver_remove_file(&cfspi_spi_driver.driver, | |
857 | &driver_attr_down_head_align); | |
858 | err_create_down_head_align: | |
859 | driver_remove_file(&cfspi_spi_driver.driver, | |
860 | &driver_attr_up_tail_align); | |
861 | err_create_up_tail_align: | |
862 | driver_remove_file(&cfspi_spi_driver.driver, | |
863 | &driver_attr_up_head_align); | |
864 | err_create_up_head_align: | |
e56db277 | 865 | platform_driver_unregister(&cfspi_spi_driver); |
529d6dad SB |
866 | err_dev_register: |
867 | return result; | |
868 | } | |
869 | ||
870 | module_init(cfspi_init_module); | |
871 | module_exit(cfspi_exit_module); |