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; |
d61e4038 | 38 | module_param(spi_loop, bool, 0444); |
529d6dad SB |
39 | MODULE_PARM_DESC(spi_loop, "SPI running in loopback mode."); |
40 | ||
41 | /* SPI frame alignment. */ | |
d61e4038 | 42 | module_param(spi_frm_align, int, 0444); |
529d6dad SB |
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 | */ | |
d61e4038 | 49 | module_param(spi_up_head_align, int, 0444); |
529d6dad SB |
50 | MODULE_PARM_DESC(spi_up_head_align, "SPI uplink head alignment."); |
51 | ||
d61e4038 | 52 | module_param(spi_up_tail_align, int, 0444); |
529d6dad SB |
53 | MODULE_PARM_DESC(spi_up_tail_align, "SPI uplink tail alignment."); |
54 | ||
d61e4038 | 55 | module_param(spi_down_head_align, int, 0444); |
529d6dad SB |
56 | MODULE_PARM_DESC(spi_down_head_align, "SPI downlink head alignment."); |
57 | ||
d61e4038 | 58 | module_param(spi_down_tail_align, int, 0444); |
529d6dad SB |
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 | ||
e222822f | 76 | #ifndef CONFIG_HAS_DMA |
529d6dad SB |
77 | |
78 | /* | |
79 | * We sometimes use UML for debugging, but it cannot handle | |
80 | * dma_alloc_coherent so we have to wrap it. | |
81 | */ | |
e222822f | 82 | static inline void *dma_alloc(struct cfspi *cfspi, dma_addr_t *daddr) |
529d6dad SB |
83 | { |
84 | return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL); | |
85 | } | |
86 | ||
e222822f CH |
87 | static inline void dma_free(struct cfspi *cfspi, void *cpu_addr, |
88 | dma_addr_t handle) | |
529d6dad SB |
89 | { |
90 | kfree(cpu_addr); | |
91 | } | |
92 | ||
93 | #else | |
94 | ||
e222822f | 95 | static inline void *dma_alloc(struct cfspi *cfspi, dma_addr_t *daddr) |
529d6dad | 96 | { |
e222822f | 97 | return dma_alloc_coherent(&cfspi->pdev->dev, SPI_DMA_BUF_LEN, daddr, |
529d6dad SB |
98 | GFP_KERNEL); |
99 | } | |
100 | ||
e222822f CH |
101 | static inline void dma_free(struct cfspi *cfspi, void *cpu_addr, |
102 | dma_addr_t handle) | |
529d6dad | 103 | { |
e222822f | 104 | dma_free_coherent(&cfspi->pdev->dev, SPI_DMA_BUF_LEN, cpu_addr, handle); |
529d6dad | 105 | } |
e222822f | 106 | #endif /* CONFIG_HAS_DMA */ |
529d6dad SB |
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 | ||
529d6dad SB |
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), | |
59d53bc2 | 190 | "--- %zu bytes skipped ---\n", |
191 | count - (cut * 2)); | |
529d6dad SB |
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), | |
d5f43c1e | 224 | cfspi->xfer.va_tx[0], |
529d6dad SB |
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 = { | |
234e3405 | 241 | .open = simple_open, |
529d6dad | 242 | .read = dbgfs_state, |
2c24a5d1 | 243 | .owner = THIS_MODULE |
529d6dad SB |
244 | }; |
245 | ||
246 | static const struct file_operations dbgfs_frame_fops = { | |
234e3405 | 247 | .open = simple_open, |
529d6dad | 248 | .read = dbgfs_frame, |
2c24a5d1 | 249 | .owner = THIS_MODULE |
529d6dad SB |
250 | }; |
251 | ||
252 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
253 | { | |
254 | cfspi->dbgfs_dir = debugfs_create_dir(cfspi->pdev->name, dbgfs_root); | |
d61e4038 | 255 | cfspi->dbgfs_state = debugfs_create_file("state", 0444, |
529d6dad SB |
256 | cfspi->dbgfs_dir, cfspi, |
257 | &dbgfs_state_fops); | |
d61e4038 | 258 | cfspi->dbgfs_frame = debugfs_create_file("frame", 0444, |
529d6dad SB |
259 | cfspi->dbgfs_dir, cfspi, |
260 | &dbgfs_frame_fops); | |
261 | } | |
262 | ||
263 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
264 | { | |
265 | cfspi->dbg_state = state; | |
266 | }; | |
267 | #else | |
268 | ||
269 | static inline void driver_debugfs_create(void) | |
270 | { | |
271 | } | |
272 | ||
273 | static inline void driver_debugfs_remove(void) | |
274 | { | |
275 | } | |
276 | ||
277 | static inline void dev_debugfs_add(struct cfspi *cfspi) | |
278 | { | |
279 | } | |
280 | ||
281 | static inline void dev_debugfs_rem(struct cfspi *cfspi) | |
282 | { | |
283 | } | |
284 | ||
285 | inline void cfspi_dbg_state(struct cfspi *cfspi, int state) | |
286 | { | |
287 | } | |
288 | #endif /* CONFIG_DEBUG_FS */ | |
289 | ||
290 | static LIST_HEAD(cfspi_list); | |
291 | static spinlock_t cfspi_list_lock; | |
292 | ||
293 | /* SPI uplink head alignment. */ | |
f85205c4 | 294 | static ssize_t up_head_align_show(struct device_driver *driver, char *buf) |
529d6dad SB |
295 | { |
296 | return sprintf(buf, "%d\n", spi_up_head_align); | |
297 | } | |
298 | ||
f85205c4 | 299 | static DRIVER_ATTR_RO(up_head_align); |
529d6dad SB |
300 | |
301 | /* SPI uplink tail alignment. */ | |
f85205c4 | 302 | static ssize_t up_tail_align_show(struct device_driver *driver, char *buf) |
529d6dad SB |
303 | { |
304 | return sprintf(buf, "%d\n", spi_up_tail_align); | |
305 | } | |
306 | ||
f85205c4 | 307 | static DRIVER_ATTR_RO(up_tail_align); |
529d6dad SB |
308 | |
309 | /* SPI downlink head alignment. */ | |
f85205c4 | 310 | static ssize_t down_head_align_show(struct device_driver *driver, char *buf) |
529d6dad SB |
311 | { |
312 | return sprintf(buf, "%d\n", spi_down_head_align); | |
313 | } | |
314 | ||
f85205c4 | 315 | static DRIVER_ATTR_RO(down_head_align); |
529d6dad SB |
316 | |
317 | /* SPI downlink tail alignment. */ | |
f85205c4 | 318 | static ssize_t down_tail_align_show(struct device_driver *driver, char *buf) |
529d6dad SB |
319 | { |
320 | return sprintf(buf, "%d\n", spi_down_tail_align); | |
321 | } | |
322 | ||
f85205c4 | 323 | static DRIVER_ATTR_RO(down_tail_align); |
529d6dad SB |
324 | |
325 | /* SPI frame alignment. */ | |
f85205c4 | 326 | static ssize_t frame_align_show(struct device_driver *driver, char *buf) |
529d6dad SB |
327 | { |
328 | return sprintf(buf, "%d\n", spi_frm_align); | |
329 | } | |
330 | ||
f85205c4 | 331 | static DRIVER_ATTR_RO(frame_align); |
529d6dad SB |
332 | |
333 | int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
334 | { | |
335 | u8 *dst = buf; | |
336 | caif_assert(buf); | |
337 | ||
2c24a5d1 SB |
338 | if (cfspi->slave && !cfspi->slave_talked) |
339 | cfspi->slave_talked = true; | |
340 | ||
529d6dad SB |
341 | do { |
342 | struct sk_buff *skb; | |
343 | struct caif_payload_info *info; | |
344 | int spad = 0; | |
345 | int epad; | |
346 | ||
347 | skb = skb_dequeue(&cfspi->chead); | |
348 | if (!skb) | |
349 | break; | |
350 | ||
351 | /* | |
352 | * Calculate length of frame including SPI padding. | |
353 | * The payload position is found in the control buffer. | |
354 | */ | |
355 | info = (struct caif_payload_info *)&skb->cb; | |
356 | ||
357 | /* | |
358 | * Compute head offset i.e. number of bytes to add to | |
359 | * get the start of the payload aligned. | |
360 | */ | |
2c24a5d1 SB |
361 | if (spi_up_head_align > 1) { |
362 | spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); | |
529d6dad SB |
363 | *dst = (u8)(spad - 1); |
364 | dst += spad; | |
365 | } | |
366 | ||
367 | /* Copy in CAIF frame. */ | |
368 | skb_copy_bits(skb, 0, dst, skb->len); | |
369 | dst += skb->len; | |
370 | cfspi->ndev->stats.tx_packets++; | |
371 | cfspi->ndev->stats.tx_bytes += skb->len; | |
372 | ||
373 | /* | |
374 | * Compute tail offset i.e. number of bytes to add to | |
375 | * get the complete CAIF frame aligned. | |
376 | */ | |
2c24a5d1 | 377 | epad = PAD_POW2((skb->len + spad), spi_up_tail_align); |
529d6dad SB |
378 | dst += epad; |
379 | ||
380 | dev_kfree_skb(skb); | |
381 | ||
382 | } while ((dst - buf) < len); | |
383 | ||
384 | return dst - buf; | |
385 | } | |
386 | ||
387 | int cfspi_xmitlen(struct cfspi *cfspi) | |
388 | { | |
389 | struct sk_buff *skb = NULL; | |
390 | int frm_len = 0; | |
391 | int pkts = 0; | |
392 | ||
393 | /* | |
25985edc | 394 | * Decommit previously committed frames. |
529d6dad SB |
395 | * skb_queue_splice_tail(&cfspi->chead,&cfspi->qhead) |
396 | */ | |
397 | while (skb_peek(&cfspi->chead)) { | |
398 | skb = skb_dequeue_tail(&cfspi->chead); | |
399 | skb_queue_head(&cfspi->qhead, skb); | |
400 | } | |
401 | ||
402 | do { | |
403 | struct caif_payload_info *info = NULL; | |
404 | int spad = 0; | |
405 | int epad = 0; | |
406 | ||
407 | skb = skb_dequeue(&cfspi->qhead); | |
408 | if (!skb) | |
409 | break; | |
410 | ||
411 | /* | |
412 | * Calculate length of frame including SPI padding. | |
413 | * The payload position is found in the control buffer. | |
414 | */ | |
415 | info = (struct caif_payload_info *)&skb->cb; | |
416 | ||
417 | /* | |
418 | * Compute head offset i.e. number of bytes to add to | |
419 | * get the start of the payload aligned. | |
420 | */ | |
2c24a5d1 SB |
421 | if (spi_up_head_align > 1) |
422 | spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align); | |
529d6dad SB |
423 | |
424 | /* | |
425 | * Compute tail offset i.e. number of bytes to add to | |
426 | * get the complete CAIF frame aligned. | |
427 | */ | |
2c24a5d1 | 428 | epad = PAD_POW2((skb->len + spad), spi_up_tail_align); |
529d6dad SB |
429 | |
430 | if ((skb->len + spad + epad + frm_len) <= CAIF_MAX_SPI_FRAME) { | |
431 | skb_queue_tail(&cfspi->chead, skb); | |
432 | pkts++; | |
433 | frm_len += skb->len + spad + epad; | |
434 | } else { | |
435 | /* Put back packet. */ | |
436 | skb_queue_head(&cfspi->qhead, skb); | |
2c24a5d1 | 437 | break; |
529d6dad SB |
438 | } |
439 | } while (pkts <= CAIF_MAX_SPI_PKTS); | |
440 | ||
441 | /* | |
442 | * Send flow on if previously sent flow off | |
443 | * and now go below the low water mark | |
444 | */ | |
445 | if (cfspi->flow_off_sent && cfspi->qhead.qlen < cfspi->qd_low_mark && | |
446 | cfspi->cfdev.flowctrl) { | |
447 | cfspi->flow_off_sent = 0; | |
448 | cfspi->cfdev.flowctrl(cfspi->ndev, 1); | |
449 | } | |
450 | ||
451 | return frm_len; | |
452 | } | |
453 | ||
454 | static void cfspi_ss_cb(bool assert, struct cfspi_ifc *ifc) | |
455 | { | |
456 | struct cfspi *cfspi = (struct cfspi *)ifc->priv; | |
457 | ||
2c24a5d1 SB |
458 | /* |
459 | * The slave device is the master on the link. Interrupts before the | |
460 | * slave has transmitted are considered spurious. | |
461 | */ | |
462 | if (cfspi->slave && !cfspi->slave_talked) { | |
463 | printk(KERN_WARNING "CFSPI: Spurious SS interrupt.\n"); | |
464 | return; | |
465 | } | |
466 | ||
529d6dad SB |
467 | if (!in_interrupt()) |
468 | spin_lock(&cfspi->lock); | |
469 | if (assert) { | |
470 | set_bit(SPI_SS_ON, &cfspi->state); | |
471 | set_bit(SPI_XFER, &cfspi->state); | |
472 | } else { | |
473 | set_bit(SPI_SS_OFF, &cfspi->state); | |
474 | } | |
475 | if (!in_interrupt()) | |
476 | spin_unlock(&cfspi->lock); | |
477 | ||
478 | /* Wake up the xfer thread. */ | |
2c24a5d1 SB |
479 | if (assert) |
480 | wake_up_interruptible(&cfspi->wait); | |
529d6dad SB |
481 | } |
482 | ||
483 | static void cfspi_xfer_done_cb(struct cfspi_ifc *ifc) | |
484 | { | |
485 | struct cfspi *cfspi = (struct cfspi *)ifc->priv; | |
486 | ||
487 | /* Transfer done, complete work queue */ | |
488 | complete(&cfspi->comp); | |
489 | } | |
490 | ||
491 | static int cfspi_xmit(struct sk_buff *skb, struct net_device *dev) | |
492 | { | |
493 | struct cfspi *cfspi = NULL; | |
494 | unsigned long flags; | |
495 | if (!dev) | |
496 | return -EINVAL; | |
497 | ||
498 | cfspi = netdev_priv(dev); | |
499 | ||
500 | skb_queue_tail(&cfspi->qhead, skb); | |
501 | ||
502 | spin_lock_irqsave(&cfspi->lock, flags); | |
503 | if (!test_and_set_bit(SPI_XFER, &cfspi->state)) { | |
504 | /* Wake up xfer thread. */ | |
505 | wake_up_interruptible(&cfspi->wait); | |
506 | } | |
507 | spin_unlock_irqrestore(&cfspi->lock, flags); | |
508 | ||
509 | /* Send flow off if number of bytes is above high water mark */ | |
510 | if (!cfspi->flow_off_sent && | |
511 | cfspi->qhead.qlen > cfspi->qd_high_mark && | |
512 | cfspi->cfdev.flowctrl) { | |
513 | cfspi->flow_off_sent = 1; | |
514 | cfspi->cfdev.flowctrl(cfspi->ndev, 0); | |
515 | } | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len) | |
521 | { | |
522 | u8 *src = buf; | |
523 | ||
524 | caif_assert(buf != NULL); | |
525 | ||
526 | do { | |
527 | int res; | |
528 | struct sk_buff *skb = NULL; | |
529 | int spad = 0; | |
530 | int epad = 0; | |
529d6dad SB |
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 | ||
b952f4df | 552 | skb_put_data(skb, src, pkt_len); |
529d6dad SB |
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. */ |
e222822f | 615 | cfspi->xfer.va_tx[0] = dma_alloc(cfspi, &cfspi->xfer.pa_tx[0]); |
d5f43c1e | 616 | if (!cfspi->xfer.va_tx[0]) { |
529d6dad | 617 | res = -ENODEV; |
d5f43c1e | 618 | goto err_dma_alloc_tx_0; |
529d6dad SB |
619 | } |
620 | ||
e222822f | 621 | cfspi->xfer.va_rx = dma_alloc(cfspi, &cfspi->xfer.pa_rx); |
529d6dad SB |
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: | |
e222822f | 670 | dma_free(cfspi, cfspi->xfer.va_rx, cfspi->xfer.pa_rx); |
d5f43c1e | 671 | err_dma_alloc_rx: |
e222822f | 672 | dma_free(cfspi, cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); |
d5f43c1e EB |
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. */ | |
e222822f CH |
688 | dma_free(cfspi, cfspi->xfer.va_rx, cfspi->xfer.pa_rx); |
689 | dma_free(cfspi, cfspi->xfer.va_tx[0], cfspi->xfer.pa_tx[0]); | |
d5f43c1e EB |
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; | |
4676a152 | 713 | dev->priv_flags |= IFF_NO_QUEUE; |
d5f43c1e | 714 | dev->mtu = SPI_MAX_PAYLOAD_SIZE; |
cf124db5 | 715 | dev->needs_free_netdev = true; |
d5f43c1e EB |
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 | ||
d5f43c1e EB |
733 | if (!dev) |
734 | return -ENODEV; | |
735 | ||
cfb76d77 RV |
736 | ndev = alloc_netdev(sizeof(struct cfspi), "cfspi%d", |
737 | NET_NAME_UNKNOWN, cfspi_setup); | |
738 | if (!ndev) | |
739 | return -ENOMEM; | |
740 | ||
d5f43c1e EB |
741 | cfspi = netdev_priv(ndev); |
742 | netif_stop_queue(ndev); | |
743 | cfspi->ndev = ndev; | |
744 | cfspi->pdev = pdev; | |
745 | ||
746 | /* Assign the SPI device. */ | |
747 | cfspi->dev = dev; | |
748 | /* Assign the device ifc to this SPI interface. */ | |
749 | dev->ifc = &cfspi->ifc; | |
750 | ||
529d6dad SB |
751 | /* Register network device. */ |
752 | res = register_netdev(ndev); | |
753 | if (res) { | |
754 | printk(KERN_ERR "CFSPI: Reg. error: %d.\n", res); | |
755 | goto err_net_reg; | |
756 | } | |
757 | return res; | |
758 | ||
759 | err_net_reg: | |
529d6dad SB |
760 | free_netdev(ndev); |
761 | ||
762 | return res; | |
763 | } | |
764 | ||
765 | int cfspi_spi_remove(struct platform_device *pdev) | |
766 | { | |
d5f43c1e EB |
767 | /* Everything is done in cfspi_uninit(). */ |
768 | return 0; | |
529d6dad SB |
769 | } |
770 | ||
771 | static void __exit cfspi_exit_module(void) | |
772 | { | |
773 | struct list_head *list_node; | |
774 | struct list_head *n; | |
775 | struct cfspi *cfspi = NULL; | |
776 | ||
777 | list_for_each_safe(list_node, n, &cfspi_list) { | |
778 | cfspi = list_entry(list_node, struct cfspi, list); | |
d5f43c1e | 779 | unregister_netdev(cfspi->ndev); |
529d6dad SB |
780 | } |
781 | ||
782 | /* Destroy sysfs files. */ | |
783 | driver_remove_file(&cfspi_spi_driver.driver, | |
784 | &driver_attr_up_head_align); | |
785 | driver_remove_file(&cfspi_spi_driver.driver, | |
786 | &driver_attr_up_tail_align); | |
787 | driver_remove_file(&cfspi_spi_driver.driver, | |
788 | &driver_attr_down_head_align); | |
789 | driver_remove_file(&cfspi_spi_driver.driver, | |
790 | &driver_attr_down_tail_align); | |
791 | driver_remove_file(&cfspi_spi_driver.driver, &driver_attr_frame_align); | |
792 | /* Unregister platform driver. */ | |
793 | platform_driver_unregister(&cfspi_spi_driver); | |
794 | /* Destroy debugfs root directory. */ | |
795 | driver_debugfs_remove(); | |
796 | } | |
797 | ||
798 | static int __init cfspi_init_module(void) | |
799 | { | |
800 | int result; | |
801 | ||
802 | /* Initialize spin lock. */ | |
803 | spin_lock_init(&cfspi_list_lock); | |
804 | ||
805 | /* Register platform driver. */ | |
806 | result = platform_driver_register(&cfspi_spi_driver); | |
807 | if (result) { | |
808 | printk(KERN_ERR "Could not register platform SPI driver.\n"); | |
809 | goto err_dev_register; | |
810 | } | |
811 | ||
812 | /* Create sysfs files. */ | |
813 | result = | |
814 | driver_create_file(&cfspi_spi_driver.driver, | |
815 | &driver_attr_up_head_align); | |
816 | if (result) { | |
817 | printk(KERN_ERR "Sysfs creation failed 1.\n"); | |
818 | goto err_create_up_head_align; | |
819 | } | |
820 | ||
821 | result = | |
822 | driver_create_file(&cfspi_spi_driver.driver, | |
823 | &driver_attr_up_tail_align); | |
824 | if (result) { | |
825 | printk(KERN_ERR "Sysfs creation failed 2.\n"); | |
826 | goto err_create_up_tail_align; | |
827 | } | |
828 | ||
829 | result = | |
830 | driver_create_file(&cfspi_spi_driver.driver, | |
831 | &driver_attr_down_head_align); | |
832 | if (result) { | |
833 | printk(KERN_ERR "Sysfs creation failed 3.\n"); | |
834 | goto err_create_down_head_align; | |
835 | } | |
836 | ||
837 | result = | |
838 | driver_create_file(&cfspi_spi_driver.driver, | |
839 | &driver_attr_down_tail_align); | |
840 | if (result) { | |
841 | printk(KERN_ERR "Sysfs creation failed 4.\n"); | |
842 | goto err_create_down_tail_align; | |
843 | } | |
844 | ||
845 | result = | |
846 | driver_create_file(&cfspi_spi_driver.driver, | |
847 | &driver_attr_frame_align); | |
848 | if (result) { | |
849 | printk(KERN_ERR "Sysfs creation failed 5.\n"); | |
850 | goto err_create_frame_align; | |
851 | } | |
852 | driver_debugfs_create(); | |
853 | return result; | |
854 | ||
855 | err_create_frame_align: | |
856 | driver_remove_file(&cfspi_spi_driver.driver, | |
857 | &driver_attr_down_tail_align); | |
858 | err_create_down_tail_align: | |
859 | driver_remove_file(&cfspi_spi_driver.driver, | |
860 | &driver_attr_down_head_align); | |
861 | err_create_down_head_align: | |
862 | driver_remove_file(&cfspi_spi_driver.driver, | |
863 | &driver_attr_up_tail_align); | |
864 | err_create_up_tail_align: | |
865 | driver_remove_file(&cfspi_spi_driver.driver, | |
866 | &driver_attr_up_head_align); | |
867 | err_create_up_head_align: | |
e56db277 | 868 | platform_driver_unregister(&cfspi_spi_driver); |
529d6dad SB |
869 | err_dev_register: |
870 | return result; | |
871 | } | |
872 | ||
873 | module_init(cfspi_init_module); | |
874 | module_exit(cfspi_exit_module); |