projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / net / ethernet / ti / davinci_cpdma.c
1 /*
2 * Texas Instruments CPDMA Driver
3 *
4 * Copyright (C) 2010 Texas Instruments
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation version 2.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether express or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15 #include <linux/kernel.h>
16 #include <linux/spinlock.h>
17 #include <linux/device.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/err.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/io.h>
23 #include <linux/delay.h>
24
25 #include "davinci_cpdma.h"
26
27 /* DMA Registers */
28 #define CPDMA_TXIDVER 0x00
29 #define CPDMA_TXCONTROL 0x04
30 #define CPDMA_TXTEARDOWN 0x08
31 #define CPDMA_RXIDVER 0x10
32 #define CPDMA_RXCONTROL 0x14
33 #define CPDMA_SOFTRESET 0x1c
34 #define CPDMA_RXTEARDOWN 0x18
35 #define CPDMA_TXINTSTATRAW 0x80
36 #define CPDMA_TXINTSTATMASKED 0x84
37 #define CPDMA_TXINTMASKSET 0x88
38 #define CPDMA_TXINTMASKCLEAR 0x8c
39 #define CPDMA_MACINVECTOR 0x90
40 #define CPDMA_MACEOIVECTOR 0x94
41 #define CPDMA_RXINTSTATRAW 0xa0
42 #define CPDMA_RXINTSTATMASKED 0xa4
43 #define CPDMA_RXINTMASKSET 0xa8
44 #define CPDMA_RXINTMASKCLEAR 0xac
45 #define CPDMA_DMAINTSTATRAW 0xb0
46 #define CPDMA_DMAINTSTATMASKED 0xb4
47 #define CPDMA_DMAINTMASKSET 0xb8
48 #define CPDMA_DMAINTMASKCLEAR 0xbc
49 #define CPDMA_DMAINT_HOSTERR BIT(1)
50
51 /* the following exist only if has_ext_regs is set */
52 #define CPDMA_DMACONTROL 0x20
53 #define CPDMA_DMASTATUS 0x24
54 #define CPDMA_RXBUFFOFS 0x28
55 #define CPDMA_EM_CONTROL 0x2c
56
57 /* Descriptor mode bits */
58 #define CPDMA_DESC_SOP BIT(31)
59 #define CPDMA_DESC_EOP BIT(30)
60 #define CPDMA_DESC_OWNER BIT(29)
61 #define CPDMA_DESC_EOQ BIT(28)
62 #define CPDMA_DESC_TD_COMPLETE BIT(27)
63 #define CPDMA_DESC_PASS_CRC BIT(26)
64 #define CPDMA_DESC_TO_PORT_EN BIT(20)
65 #define CPDMA_TO_PORT_SHIFT 16
66 #define CPDMA_DESC_PORT_MASK (BIT(18) | BIT(17) | BIT(16))
67 #define CPDMA_DESC_CRC_LEN 4
68
69 #define CPDMA_TEARDOWN_VALUE 0xfffffffc
70
71 struct cpdma_desc {
72 /* hardware fields */
73 u32 hw_next;
74 u32 hw_buffer;
75 u32 hw_len;
76 u32 hw_mode;
77 /* software fields */
78 void *sw_token;
79 u32 sw_buffer;
80 u32 sw_len;
81 };
82
83 struct cpdma_desc_pool {
84 u32 phys;
85 u32 hw_addr;
86 void __iomem *iomap; /* ioremap map */
87 void *cpumap; /* dma_alloc map */
88 int desc_size, mem_size;
89 int num_desc, used_desc;
90 unsigned long *bitmap;
91 struct device *dev;
92 spinlock_t lock;
93 };
94
95 enum cpdma_state {
96 CPDMA_STATE_IDLE,
97 CPDMA_STATE_ACTIVE,
98 CPDMA_STATE_TEARDOWN,
99 };
100
101 static const char *cpdma_state_str[] = { "idle", "active", "teardown" };
102
103 struct cpdma_ctlr {
104 enum cpdma_state state;
105 struct cpdma_params params;
106 struct device *dev;
107 struct cpdma_desc_pool *pool;
108 spinlock_t lock;
109 struct cpdma_chan *channels[2 * CPDMA_MAX_CHANNELS];
110 };
111
112 struct cpdma_chan {
113 struct cpdma_desc __iomem *head, *tail;
114 void __iomem *hdp, *cp, *rxfree;
115 enum cpdma_state state;
116 struct cpdma_ctlr *ctlr;
117 int chan_num;
118 spinlock_t lock;
119 int count;
120 u32 mask;
121 cpdma_handler_fn handler;
122 enum dma_data_direction dir;
123 struct cpdma_chan_stats stats;
124 /* offsets into dmaregs */
125 int int_set, int_clear, td;
126 };
127
128 /* The following make access to common cpdma_ctlr params more readable */
129 #define dmaregs params.dmaregs
130 #define num_chan params.num_chan
131
132 /* various accessors */
133 #define dma_reg_read(ctlr, ofs) __raw_readl((ctlr)->dmaregs + (ofs))
134 #define chan_read(chan, fld) __raw_readl((chan)->fld)
135 #define desc_read(desc, fld) __raw_readl(&(desc)->fld)
136 #define dma_reg_write(ctlr, ofs, v) __raw_writel(v, (ctlr)->dmaregs + (ofs))
137 #define chan_write(chan, fld, v) __raw_writel(v, (chan)->fld)
138 #define desc_write(desc, fld, v) __raw_writel((u32)(v), &(desc)->fld)
139
140 #define cpdma_desc_to_port(chan, mode, directed) \
141 do { \
142 if (!is_rx_chan(chan) && ((directed == 1) || \
143 (directed == 2))) \
144 mode |= (CPDMA_DESC_TO_PORT_EN | \
145 (directed << CPDMA_TO_PORT_SHIFT)); \
146 } while (0)
147
148 /*
149 * Utility constructs for a cpdma descriptor pool. Some devices (e.g. davinci
150 * emac) have dedicated on-chip memory for these descriptors. Some other
151 * devices (e.g. cpsw switches) use plain old memory. Descriptor pools
152 * abstract out these details
153 */
154 static struct cpdma_desc_pool *
155 cpdma_desc_pool_create(struct device *dev, u32 phys, u32 hw_addr,
156 int size, int align)
157 {
158 int bitmap_size;
159 struct cpdma_desc_pool *pool;
160
161 pool = kzalloc(sizeof(*pool), GFP_KERNEL);
162 if (!pool)
163 return NULL;
164
165 spin_lock_init(&pool->lock);
166
167 pool->dev = dev;
168 pool->mem_size = size;
169 pool->desc_size = ALIGN(sizeof(struct cpdma_desc), align);
170 pool->num_desc = size / pool->desc_size;
171
172 bitmap_size = (pool->num_desc / BITS_PER_LONG) * sizeof(long);
173 pool->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
174 if (!pool->bitmap)
175 goto fail;
176
177 if (phys) {
178 pool->phys = phys;
179 pool->iomap = ioremap(phys, size);
180 pool->hw_addr = hw_addr;
181 } else {
182 pool->cpumap = dma_alloc_coherent(dev, size, &pool->phys,
183 GFP_KERNEL);
184 pool->iomap = pool->cpumap;
185 pool->hw_addr = pool->phys;
186 }
187
188 if (pool->iomap)
189 return pool;
190
191 fail:
192 kfree(pool->bitmap);
193 kfree(pool);
194 return NULL;
195 }
196
197 static void cpdma_desc_pool_destroy(struct cpdma_desc_pool *pool)
198 {
199 unsigned long flags;
200
201 if (!pool)
202 return;
203
204 spin_lock_irqsave(&pool->lock, flags);
205 WARN_ON(pool->used_desc);
206 kfree(pool->bitmap);
207 if (pool->cpumap) {
208 dma_free_coherent(pool->dev, pool->mem_size, pool->cpumap,
209 pool->phys);
210 } else {
211 iounmap(pool->iomap);
212 }
213 spin_unlock_irqrestore(&pool->lock, flags);
214 kfree(pool);
215 }
216
217 static inline dma_addr_t desc_phys(struct cpdma_desc_pool *pool,
218 struct cpdma_desc __iomem *desc)
219 {
220 if (!desc)
221 return 0;
222 return pool->hw_addr + (__force dma_addr_t)desc -
223 (__force dma_addr_t)pool->iomap;
224 }
225
226 static inline struct cpdma_desc __iomem *
227 desc_from_phys(struct cpdma_desc_pool *pool, dma_addr_t dma)
228 {
229 return dma ? pool->iomap + dma - pool->hw_addr : NULL;
230 }
231
232 static struct cpdma_desc __iomem *
233 cpdma_desc_alloc(struct cpdma_desc_pool *pool, int num_desc, bool is_rx)
234 {
235 unsigned long flags;
236 int index;
237 int desc_start;
238 int desc_end;
239 struct cpdma_desc __iomem *desc = NULL;
240
241 spin_lock_irqsave(&pool->lock, flags);
242
243 if (is_rx) {
244 desc_start = 0;
245 desc_end = pool->num_desc/2;
246 } else {
247 desc_start = pool->num_desc/2;
248 desc_end = pool->num_desc;
249 }
250
251 index = bitmap_find_next_zero_area(pool->bitmap,
252 desc_end, desc_start, num_desc, 0);
253 if (index < desc_end) {
254 bitmap_set(pool->bitmap, index, num_desc);
255 desc = pool->iomap + pool->desc_size * index;
256 pool->used_desc++;
257 }
258
259 spin_unlock_irqrestore(&pool->lock, flags);
260 return desc;
261 }
262
263 static void cpdma_desc_free(struct cpdma_desc_pool *pool,
264 struct cpdma_desc __iomem *desc, int num_desc)
265 {
266 unsigned long flags, index;
267
268 index = ((unsigned long)desc - (unsigned long)pool->iomap) /
269 pool->desc_size;
270 spin_lock_irqsave(&pool->lock, flags);
271 bitmap_clear(pool->bitmap, index, num_desc);
272 pool->used_desc--;
273 spin_unlock_irqrestore(&pool->lock, flags);
274 }
275
276 struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params)
277 {
278 struct cpdma_ctlr *ctlr;
279
280 ctlr = kzalloc(sizeof(*ctlr), GFP_KERNEL);
281 if (!ctlr)
282 return NULL;
283
284 ctlr->state = CPDMA_STATE_IDLE;
285 ctlr->params = *params;
286 ctlr->dev = params->dev;
287 spin_lock_init(&ctlr->lock);
288
289 ctlr->pool = cpdma_desc_pool_create(ctlr->dev,
290 ctlr->params.desc_mem_phys,
291 ctlr->params.desc_hw_addr,
292 ctlr->params.desc_mem_size,
293 ctlr->params.desc_align);
294 if (!ctlr->pool) {
295 kfree(ctlr);
296 return NULL;
297 }
298
299 if (WARN_ON(ctlr->num_chan > CPDMA_MAX_CHANNELS))
300 ctlr->num_chan = CPDMA_MAX_CHANNELS;
301 return ctlr;
302 }
303 EXPORT_SYMBOL_GPL(cpdma_ctlr_create);
304
305 int cpdma_ctlr_start(struct cpdma_ctlr *ctlr)
306 {
307 unsigned long flags;
308 int i;
309
310 spin_lock_irqsave(&ctlr->lock, flags);
311 if (ctlr->state != CPDMA_STATE_IDLE) {
312 spin_unlock_irqrestore(&ctlr->lock, flags);
313 return -EBUSY;
314 }
315
316 if (ctlr->params.has_soft_reset) {
317 unsigned timeout = 10 * 100;
318
319 dma_reg_write(ctlr, CPDMA_SOFTRESET, 1);
320 while (timeout) {
321 if (dma_reg_read(ctlr, CPDMA_SOFTRESET) == 0)
322 break;
323 udelay(10);
324 timeout--;
325 }
326 WARN_ON(!timeout);
327 }
328
329 for (i = 0; i < ctlr->num_chan; i++) {
330 __raw_writel(0, ctlr->params.txhdp + 4 * i);
331 __raw_writel(0, ctlr->params.rxhdp + 4 * i);
332 __raw_writel(0, ctlr->params.txcp + 4 * i);
333 __raw_writel(0, ctlr->params.rxcp + 4 * i);
334 }
335
336 dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
337 dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
338
339 dma_reg_write(ctlr, CPDMA_TXCONTROL, 1);
340 dma_reg_write(ctlr, CPDMA_RXCONTROL, 1);
341
342 ctlr->state = CPDMA_STATE_ACTIVE;
343
344 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
345 if (ctlr->channels[i])
346 cpdma_chan_start(ctlr->channels[i]);
347 }
348 spin_unlock_irqrestore(&ctlr->lock, flags);
349 return 0;
350 }
351 EXPORT_SYMBOL_GPL(cpdma_ctlr_start);
352
353 int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr)
354 {
355 unsigned long flags;
356 int i;
357
358 spin_lock_irqsave(&ctlr->lock, flags);
359 if (ctlr->state != CPDMA_STATE_ACTIVE) {
360 spin_unlock_irqrestore(&ctlr->lock, flags);
361 return -EINVAL;
362 }
363
364 ctlr->state = CPDMA_STATE_TEARDOWN;
365
366 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
367 if (ctlr->channels[i])
368 cpdma_chan_stop(ctlr->channels[i]);
369 }
370
371 dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
372 dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
373
374 dma_reg_write(ctlr, CPDMA_TXCONTROL, 0);
375 dma_reg_write(ctlr, CPDMA_RXCONTROL, 0);
376
377 ctlr->state = CPDMA_STATE_IDLE;
378
379 spin_unlock_irqrestore(&ctlr->lock, flags);
380 return 0;
381 }
382 EXPORT_SYMBOL_GPL(cpdma_ctlr_stop);
383
384 int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr)
385 {
386 struct device *dev = ctlr->dev;
387 unsigned long flags;
388 int i;
389
390 spin_lock_irqsave(&ctlr->lock, flags);
391
392 dev_info(dev, "CPDMA: state: %s", cpdma_state_str[ctlr->state]);
393
394 dev_info(dev, "CPDMA: txidver: %x",
395 dma_reg_read(ctlr, CPDMA_TXIDVER));
396 dev_info(dev, "CPDMA: txcontrol: %x",
397 dma_reg_read(ctlr, CPDMA_TXCONTROL));
398 dev_info(dev, "CPDMA: txteardown: %x",
399 dma_reg_read(ctlr, CPDMA_TXTEARDOWN));
400 dev_info(dev, "CPDMA: rxidver: %x",
401 dma_reg_read(ctlr, CPDMA_RXIDVER));
402 dev_info(dev, "CPDMA: rxcontrol: %x",
403 dma_reg_read(ctlr, CPDMA_RXCONTROL));
404 dev_info(dev, "CPDMA: softreset: %x",
405 dma_reg_read(ctlr, CPDMA_SOFTRESET));
406 dev_info(dev, "CPDMA: rxteardown: %x",
407 dma_reg_read(ctlr, CPDMA_RXTEARDOWN));
408 dev_info(dev, "CPDMA: txintstatraw: %x",
409 dma_reg_read(ctlr, CPDMA_TXINTSTATRAW));
410 dev_info(dev, "CPDMA: txintstatmasked: %x",
411 dma_reg_read(ctlr, CPDMA_TXINTSTATMASKED));
412 dev_info(dev, "CPDMA: txintmaskset: %x",
413 dma_reg_read(ctlr, CPDMA_TXINTMASKSET));
414 dev_info(dev, "CPDMA: txintmaskclear: %x",
415 dma_reg_read(ctlr, CPDMA_TXINTMASKCLEAR));
416 dev_info(dev, "CPDMA: macinvector: %x",
417 dma_reg_read(ctlr, CPDMA_MACINVECTOR));
418 dev_info(dev, "CPDMA: maceoivector: %x",
419 dma_reg_read(ctlr, CPDMA_MACEOIVECTOR));
420 dev_info(dev, "CPDMA: rxintstatraw: %x",
421 dma_reg_read(ctlr, CPDMA_RXINTSTATRAW));
422 dev_info(dev, "CPDMA: rxintstatmasked: %x",
423 dma_reg_read(ctlr, CPDMA_RXINTSTATMASKED));
424 dev_info(dev, "CPDMA: rxintmaskset: %x",
425 dma_reg_read(ctlr, CPDMA_RXINTMASKSET));
426 dev_info(dev, "CPDMA: rxintmaskclear: %x",
427 dma_reg_read(ctlr, CPDMA_RXINTMASKCLEAR));
428 dev_info(dev, "CPDMA: dmaintstatraw: %x",
429 dma_reg_read(ctlr, CPDMA_DMAINTSTATRAW));
430 dev_info(dev, "CPDMA: dmaintstatmasked: %x",
431 dma_reg_read(ctlr, CPDMA_DMAINTSTATMASKED));
432 dev_info(dev, "CPDMA: dmaintmaskset: %x",
433 dma_reg_read(ctlr, CPDMA_DMAINTMASKSET));
434 dev_info(dev, "CPDMA: dmaintmaskclear: %x",
435 dma_reg_read(ctlr, CPDMA_DMAINTMASKCLEAR));
436
437 if (!ctlr->params.has_ext_regs) {
438 dev_info(dev, "CPDMA: dmacontrol: %x",
439 dma_reg_read(ctlr, CPDMA_DMACONTROL));
440 dev_info(dev, "CPDMA: dmastatus: %x",
441 dma_reg_read(ctlr, CPDMA_DMASTATUS));
442 dev_info(dev, "CPDMA: rxbuffofs: %x",
443 dma_reg_read(ctlr, CPDMA_RXBUFFOFS));
444 }
445
446 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++)
447 if (ctlr->channels[i])
448 cpdma_chan_dump(ctlr->channels[i]);
449
450 spin_unlock_irqrestore(&ctlr->lock, flags);
451 return 0;
452 }
453 EXPORT_SYMBOL_GPL(cpdma_ctlr_dump);
454
455 int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr)
456 {
457 unsigned long flags;
458 int ret = 0, i;
459
460 if (!ctlr)
461 return -EINVAL;
462
463 spin_lock_irqsave(&ctlr->lock, flags);
464 if (ctlr->state != CPDMA_STATE_IDLE)
465 cpdma_ctlr_stop(ctlr);
466
467 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++)
468 cpdma_chan_destroy(ctlr->channels[i]);
469
470 cpdma_desc_pool_destroy(ctlr->pool);
471 spin_unlock_irqrestore(&ctlr->lock, flags);
472 kfree(ctlr);
473 return ret;
474 }
475 EXPORT_SYMBOL_GPL(cpdma_ctlr_destroy);
476
477 int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable)
478 {
479 unsigned long flags;
480 int i, reg;
481
482 spin_lock_irqsave(&ctlr->lock, flags);
483 if (ctlr->state != CPDMA_STATE_ACTIVE) {
484 spin_unlock_irqrestore(&ctlr->lock, flags);
485 return -EINVAL;
486 }
487
488 reg = enable ? CPDMA_DMAINTMASKSET : CPDMA_DMAINTMASKCLEAR;
489 dma_reg_write(ctlr, reg, CPDMA_DMAINT_HOSTERR);
490
491 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
492 if (ctlr->channels[i])
493 cpdma_chan_int_ctrl(ctlr->channels[i], enable);
494 }
495
496 spin_unlock_irqrestore(&ctlr->lock, flags);
497 return 0;
498 }
499 EXPORT_SYMBOL_GPL(cpdma_ctlr_int_ctrl);
500
501 void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value)
502 {
503 dma_reg_write(ctlr, CPDMA_MACEOIVECTOR, value);
504 }
505 EXPORT_SYMBOL_GPL(cpdma_ctlr_eoi);
506
507 struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
508 cpdma_handler_fn handler)
509 {
510 struct cpdma_chan *chan;
511 int ret, offset = (chan_num % CPDMA_MAX_CHANNELS) * 4;
512 unsigned long flags;
513
514 if (__chan_linear(chan_num) >= ctlr->num_chan)
515 return NULL;
516
517 ret = -ENOMEM;
518 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
519 if (!chan)
520 goto err_chan_alloc;
521
522 spin_lock_irqsave(&ctlr->lock, flags);
523 ret = -EBUSY;
524 if (ctlr->channels[chan_num])
525 goto err_chan_busy;
526
527 chan->ctlr = ctlr;
528 chan->state = CPDMA_STATE_IDLE;
529 chan->chan_num = chan_num;
530 chan->handler = handler;
531
532 if (is_rx_chan(chan)) {
533 chan->hdp = ctlr->params.rxhdp + offset;
534 chan->cp = ctlr->params.rxcp + offset;
535 chan->rxfree = ctlr->params.rxfree + offset;
536 chan->int_set = CPDMA_RXINTMASKSET;
537 chan->int_clear = CPDMA_RXINTMASKCLEAR;
538 chan->td = CPDMA_RXTEARDOWN;
539 chan->dir = DMA_FROM_DEVICE;
540 } else {
541 chan->hdp = ctlr->params.txhdp + offset;
542 chan->cp = ctlr->params.txcp + offset;
543 chan->int_set = CPDMA_TXINTMASKSET;
544 chan->int_clear = CPDMA_TXINTMASKCLEAR;
545 chan->td = CPDMA_TXTEARDOWN;
546 chan->dir = DMA_TO_DEVICE;
547 }
548 chan->mask = BIT(chan_linear(chan));
549
550 spin_lock_init(&chan->lock);
551
552 ctlr->channels[chan_num] = chan;
553 spin_unlock_irqrestore(&ctlr->lock, flags);
554 return chan;
555
556 err_chan_busy:
557 spin_unlock_irqrestore(&ctlr->lock, flags);
558 kfree(chan);
559 err_chan_alloc:
560 return ERR_PTR(ret);
561 }
562 EXPORT_SYMBOL_GPL(cpdma_chan_create);
563
564 int cpdma_chan_destroy(struct cpdma_chan *chan)
565 {
566 struct cpdma_ctlr *ctlr;
567 unsigned long flags;
568
569 if (!chan)
570 return -EINVAL;
571 ctlr = chan->ctlr;
572
573 spin_lock_irqsave(&ctlr->lock, flags);
574 if (chan->state != CPDMA_STATE_IDLE)
575 cpdma_chan_stop(chan);
576 ctlr->channels[chan->chan_num] = NULL;
577 spin_unlock_irqrestore(&ctlr->lock, flags);
578 kfree(chan);
579 return 0;
580 }
581 EXPORT_SYMBOL_GPL(cpdma_chan_destroy);
582
583 int cpdma_chan_get_stats(struct cpdma_chan *chan,
584 struct cpdma_chan_stats *stats)
585 {
586 unsigned long flags;
587 if (!chan)
588 return -EINVAL;
589 spin_lock_irqsave(&chan->lock, flags);
590 memcpy(stats, &chan->stats, sizeof(*stats));
591 spin_unlock_irqrestore(&chan->lock, flags);
592 return 0;
593 }
594
595 int cpdma_chan_dump(struct cpdma_chan *chan)
596 {
597 unsigned long flags;
598 struct device *dev = chan->ctlr->dev;
599
600 spin_lock_irqsave(&chan->lock, flags);
601
602 dev_info(dev, "channel %d (%s %d) state %s",
603 chan->chan_num, is_rx_chan(chan) ? "rx" : "tx",
604 chan_linear(chan), cpdma_state_str[chan->state]);
605 dev_info(dev, "\thdp: %x\n", chan_read(chan, hdp));
606 dev_info(dev, "\tcp: %x\n", chan_read(chan, cp));
607 if (chan->rxfree) {
608 dev_info(dev, "\trxfree: %x\n",
609 chan_read(chan, rxfree));
610 }
611
612 dev_info(dev, "\tstats head_enqueue: %d\n",
613 chan->stats.head_enqueue);
614 dev_info(dev, "\tstats tail_enqueue: %d\n",
615 chan->stats.tail_enqueue);
616 dev_info(dev, "\tstats pad_enqueue: %d\n",
617 chan->stats.pad_enqueue);
618 dev_info(dev, "\tstats misqueued: %d\n",
619 chan->stats.misqueued);
620 dev_info(dev, "\tstats desc_alloc_fail: %d\n",
621 chan->stats.desc_alloc_fail);
622 dev_info(dev, "\tstats pad_alloc_fail: %d\n",
623 chan->stats.pad_alloc_fail);
624 dev_info(dev, "\tstats runt_receive_buff: %d\n",
625 chan->stats.runt_receive_buff);
626 dev_info(dev, "\tstats runt_transmit_buff: %d\n",
627 chan->stats.runt_transmit_buff);
628 dev_info(dev, "\tstats empty_dequeue: %d\n",
629 chan->stats.empty_dequeue);
630 dev_info(dev, "\tstats busy_dequeue: %d\n",
631 chan->stats.busy_dequeue);
632 dev_info(dev, "\tstats good_dequeue: %d\n",
633 chan->stats.good_dequeue);
634 dev_info(dev, "\tstats requeue: %d\n",
635 chan->stats.requeue);
636 dev_info(dev, "\tstats teardown_dequeue: %d\n",
637 chan->stats.teardown_dequeue);
638
639 spin_unlock_irqrestore(&chan->lock, flags);
640 return 0;
641 }
642
643 static void __cpdma_chan_submit(struct cpdma_chan *chan,
644 struct cpdma_desc __iomem *desc)
645 {
646 struct cpdma_ctlr *ctlr = chan->ctlr;
647 struct cpdma_desc __iomem *prev = chan->tail;
648 struct cpdma_desc_pool *pool = ctlr->pool;
649 dma_addr_t desc_dma;
650 u32 mode;
651
652 desc_dma = desc_phys(pool, desc);
653
654 /* simple case - idle channel */
655 if (!chan->head) {
656 chan->stats.head_enqueue++;
657 chan->head = desc;
658 chan->tail = desc;
659 if (chan->state == CPDMA_STATE_ACTIVE)
660 chan_write(chan, hdp, desc_dma);
661 return;
662 }
663
664 /* first chain the descriptor at the tail of the list */
665 desc_write(prev, hw_next, desc_dma);
666 chan->tail = desc;
667 chan->stats.tail_enqueue++;
668
669 /* next check if EOQ has been triggered already */
670 mode = desc_read(prev, hw_mode);
671 if (((mode & (CPDMA_DESC_EOQ | CPDMA_DESC_OWNER)) == CPDMA_DESC_EOQ) &&
672 (chan->state == CPDMA_STATE_ACTIVE)) {
673 desc_write(prev, hw_mode, mode & ~CPDMA_DESC_EOQ);
674 chan_write(chan, hdp, desc_dma);
675 chan->stats.misqueued++;
676 }
677 }
678
679 int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
680 int len, int directed)
681 {
682 struct cpdma_ctlr *ctlr = chan->ctlr;
683 struct cpdma_desc __iomem *desc;
684 dma_addr_t buffer;
685 unsigned long flags;
686 u32 mode;
687 int ret = 0;
688
689 spin_lock_irqsave(&chan->lock, flags);
690
691 if (chan->state == CPDMA_STATE_TEARDOWN) {
692 ret = -EINVAL;
693 goto unlock_ret;
694 }
695
696 desc = cpdma_desc_alloc(ctlr->pool, 1, is_rx_chan(chan));
697 if (!desc) {
698 chan->stats.desc_alloc_fail++;
699 ret = -ENOMEM;
700 goto unlock_ret;
701 }
702
703 if (len < ctlr->params.min_packet_size) {
704 len = ctlr->params.min_packet_size;
705 chan->stats.runt_transmit_buff++;
706 }
707
708 buffer = dma_map_single(ctlr->dev, data, len, chan->dir);
709 ret = dma_mapping_error(ctlr->dev, buffer);
710 if (ret) {
711 cpdma_desc_free(ctlr->pool, desc, 1);
712 ret = -EINVAL;
713 goto unlock_ret;
714 }
715
716 mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
717 cpdma_desc_to_port(chan, mode, directed);
718
719 desc_write(desc, hw_next, 0);
720 desc_write(desc, hw_buffer, buffer);
721 desc_write(desc, hw_len, len);
722 desc_write(desc, hw_mode, mode | len);
723 desc_write(desc, sw_token, token);
724 desc_write(desc, sw_buffer, buffer);
725 desc_write(desc, sw_len, len);
726
727 __cpdma_chan_submit(chan, desc);
728
729 if (chan->state == CPDMA_STATE_ACTIVE && chan->rxfree)
730 chan_write(chan, rxfree, 1);
731
732 chan->count++;
733
734 unlock_ret:
735 spin_unlock_irqrestore(&chan->lock, flags);
736 return ret;
737 }
738 EXPORT_SYMBOL_GPL(cpdma_chan_submit);
739
740 bool cpdma_check_free_tx_desc(struct cpdma_chan *chan)
741 {
742 unsigned long flags;
743 int index;
744 bool ret;
745 struct cpdma_ctlr *ctlr = chan->ctlr;
746 struct cpdma_desc_pool *pool = ctlr->pool;
747
748 spin_lock_irqsave(&pool->lock, flags);
749
750 index = bitmap_find_next_zero_area(pool->bitmap,
751 pool->num_desc, pool->num_desc/2, 1, 0);
752
753 if (index < pool->num_desc)
754 ret = true;
755 else
756 ret = false;
757
758 spin_unlock_irqrestore(&pool->lock, flags);
759 return ret;
760 }
761 EXPORT_SYMBOL_GPL(cpdma_check_free_tx_desc);
762
763 static void __cpdma_chan_free(struct cpdma_chan *chan,
764 struct cpdma_desc __iomem *desc,
765 int outlen, int status)
766 {
767 struct cpdma_ctlr *ctlr = chan->ctlr;
768 struct cpdma_desc_pool *pool = ctlr->pool;
769 dma_addr_t buff_dma;
770 int origlen;
771 void *token;
772
773 token = (void *)desc_read(desc, sw_token);
774 buff_dma = desc_read(desc, sw_buffer);
775 origlen = desc_read(desc, sw_len);
776
777 dma_unmap_single(ctlr->dev, buff_dma, origlen, chan->dir);
778 cpdma_desc_free(pool, desc, 1);
779 (*chan->handler)(token, outlen, status);
780 }
781
782 static int __cpdma_chan_process(struct cpdma_chan *chan)
783 {
784 struct cpdma_ctlr *ctlr = chan->ctlr;
785 struct cpdma_desc __iomem *desc;
786 int status, outlen;
787 int cb_status = 0;
788 struct cpdma_desc_pool *pool = ctlr->pool;
789 dma_addr_t desc_dma;
790 unsigned long flags;
791
792 spin_lock_irqsave(&chan->lock, flags);
793
794 desc = chan->head;
795 if (!desc) {
796 chan->stats.empty_dequeue++;
797 status = -ENOENT;
798 goto unlock_ret;
799 }
800 desc_dma = desc_phys(pool, desc);
801
802 status = __raw_readl(&desc->hw_mode);
803 outlen = status & 0x7ff;
804 if (status & CPDMA_DESC_OWNER) {
805 chan->stats.busy_dequeue++;
806 status = -EBUSY;
807 goto unlock_ret;
808 }
809
810 if (status & CPDMA_DESC_PASS_CRC)
811 outlen -= CPDMA_DESC_CRC_LEN;
812
813 status = status & (CPDMA_DESC_EOQ | CPDMA_DESC_TD_COMPLETE |
814 CPDMA_DESC_PORT_MASK);
815
816 chan->head = desc_from_phys(pool, desc_read(desc, hw_next));
817 chan_write(chan, cp, desc_dma);
818 chan->count--;
819 chan->stats.good_dequeue++;
820
821 if (status & CPDMA_DESC_EOQ) {
822 chan->stats.requeue++;
823 chan_write(chan, hdp, desc_phys(pool, chan->head));
824 }
825
826 spin_unlock_irqrestore(&chan->lock, flags);
827 if (unlikely(status & CPDMA_DESC_TD_COMPLETE))
828 cb_status = -ENOSYS;
829 else
830 cb_status = status;
831
832 __cpdma_chan_free(chan, desc, outlen, cb_status);
833 return status;
834
835 unlock_ret:
836 spin_unlock_irqrestore(&chan->lock, flags);
837 return status;
838 }
839
840 int cpdma_chan_process(struct cpdma_chan *chan, int quota)
841 {
842 int used = 0, ret = 0;
843
844 if (chan->state != CPDMA_STATE_ACTIVE)
845 return -EINVAL;
846
847 while (used < quota) {
848 ret = __cpdma_chan_process(chan);
849 if (ret < 0)
850 break;
851 used++;
852 }
853 return used;
854 }
855 EXPORT_SYMBOL_GPL(cpdma_chan_process);
856
857 int cpdma_chan_start(struct cpdma_chan *chan)
858 {
859 struct cpdma_ctlr *ctlr = chan->ctlr;
860 struct cpdma_desc_pool *pool = ctlr->pool;
861 unsigned long flags;
862
863 spin_lock_irqsave(&chan->lock, flags);
864 if (chan->state != CPDMA_STATE_IDLE) {
865 spin_unlock_irqrestore(&chan->lock, flags);
866 return -EBUSY;
867 }
868 if (ctlr->state != CPDMA_STATE_ACTIVE) {
869 spin_unlock_irqrestore(&chan->lock, flags);
870 return -EINVAL;
871 }
872 dma_reg_write(ctlr, chan->int_set, chan->mask);
873 chan->state = CPDMA_STATE_ACTIVE;
874 if (chan->head) {
875 chan_write(chan, hdp, desc_phys(pool, chan->head));
876 if (chan->rxfree)
877 chan_write(chan, rxfree, chan->count);
878 }
879
880 spin_unlock_irqrestore(&chan->lock, flags);
881 return 0;
882 }
883 EXPORT_SYMBOL_GPL(cpdma_chan_start);
884
885 int cpdma_chan_stop(struct cpdma_chan *chan)
886 {
887 struct cpdma_ctlr *ctlr = chan->ctlr;
888 struct cpdma_desc_pool *pool = ctlr->pool;
889 unsigned long flags;
890 int ret;
891 unsigned timeout;
892
893 spin_lock_irqsave(&chan->lock, flags);
894 if (chan->state != CPDMA_STATE_ACTIVE) {
895 spin_unlock_irqrestore(&chan->lock, flags);
896 return -EINVAL;
897 }
898
899 chan->state = CPDMA_STATE_TEARDOWN;
900 dma_reg_write(ctlr, chan->int_clear, chan->mask);
901
902 /* trigger teardown */
903 dma_reg_write(ctlr, chan->td, chan_linear(chan));
904
905 /* wait for teardown complete */
906 timeout = 100 * 100; /* 100 ms */
907 while (timeout) {
908 u32 cp = chan_read(chan, cp);
909 if ((cp & CPDMA_TEARDOWN_VALUE) == CPDMA_TEARDOWN_VALUE)
910 break;
911 udelay(10);
912 timeout--;
913 }
914 WARN_ON(!timeout);
915 chan_write(chan, cp, CPDMA_TEARDOWN_VALUE);
916
917 /* handle completed packets */
918 spin_unlock_irqrestore(&chan->lock, flags);
919 do {
920 ret = __cpdma_chan_process(chan);
921 if (ret < 0)
922 break;
923 } while ((ret & CPDMA_DESC_TD_COMPLETE) == 0);
924 spin_lock_irqsave(&chan->lock, flags);
925
926 /* remaining packets haven't been tx/rx'ed, clean them up */
927 while (chan->head) {
928 struct cpdma_desc __iomem *desc = chan->head;
929 dma_addr_t next_dma;
930
931 next_dma = desc_read(desc, hw_next);
932 chan->head = desc_from_phys(pool, next_dma);
933 chan->count--;
934 chan->stats.teardown_dequeue++;
935
936 /* issue callback without locks held */
937 spin_unlock_irqrestore(&chan->lock, flags);
938 __cpdma_chan_free(chan, desc, 0, -ENOSYS);
939 spin_lock_irqsave(&chan->lock, flags);
940 }
941
942 chan->state = CPDMA_STATE_IDLE;
943 spin_unlock_irqrestore(&chan->lock, flags);
944 return 0;
945 }
946 EXPORT_SYMBOL_GPL(cpdma_chan_stop);
947
948 int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable)
949 {
950 unsigned long flags;
951
952 spin_lock_irqsave(&chan->lock, flags);
953 if (chan->state != CPDMA_STATE_ACTIVE) {
954 spin_unlock_irqrestore(&chan->lock, flags);
955 return -EINVAL;
956 }
957
958 dma_reg_write(chan->ctlr, enable ? chan->int_set : chan->int_clear,
959 chan->mask);
960 spin_unlock_irqrestore(&chan->lock, flags);
961
962 return 0;
963 }
964
965 struct cpdma_control_info {
966 u32 reg;
967 u32 shift, mask;
968 int access;
969 #define ACCESS_RO BIT(0)
970 #define ACCESS_WO BIT(1)
971 #define ACCESS_RW (ACCESS_RO | ACCESS_WO)
972 };
973
974 struct cpdma_control_info controls[] = {
975 [CPDMA_CMD_IDLE] = {CPDMA_DMACONTROL, 3, 1, ACCESS_WO},
976 [CPDMA_COPY_ERROR_FRAMES] = {CPDMA_DMACONTROL, 4, 1, ACCESS_RW},
977 [CPDMA_RX_OFF_LEN_UPDATE] = {CPDMA_DMACONTROL, 2, 1, ACCESS_RW},
978 [CPDMA_RX_OWNERSHIP_FLIP] = {CPDMA_DMACONTROL, 1, 1, ACCESS_RW},
979 [CPDMA_TX_PRIO_FIXED] = {CPDMA_DMACONTROL, 0, 1, ACCESS_RW},
980 [CPDMA_STAT_IDLE] = {CPDMA_DMASTATUS, 31, 1, ACCESS_RO},
981 [CPDMA_STAT_TX_ERR_CODE] = {CPDMA_DMASTATUS, 20, 0xf, ACCESS_RW},
982 [CPDMA_STAT_TX_ERR_CHAN] = {CPDMA_DMASTATUS, 16, 0x7, ACCESS_RW},
983 [CPDMA_STAT_RX_ERR_CODE] = {CPDMA_DMASTATUS, 12, 0xf, ACCESS_RW},
984 [CPDMA_STAT_RX_ERR_CHAN] = {CPDMA_DMASTATUS, 8, 0x7, ACCESS_RW},
985 [CPDMA_RX_BUFFER_OFFSET] = {CPDMA_RXBUFFOFS, 0, 0xffff, ACCESS_RW},
986 };
987
988 int cpdma_control_get(struct cpdma_ctlr *ctlr, int control)
989 {
990 unsigned long flags;
991 struct cpdma_control_info *info = &controls[control];
992 int ret;
993
994 spin_lock_irqsave(&ctlr->lock, flags);
995
996 ret = -ENOTSUPP;
997 if (!ctlr->params.has_ext_regs)
998 goto unlock_ret;
999
1000 ret = -EINVAL;
1001 if (ctlr->state != CPDMA_STATE_ACTIVE)
1002 goto unlock_ret;
1003
1004 ret = -ENOENT;
1005 if (control < 0 || control >= ARRAY_SIZE(controls))
1006 goto unlock_ret;
1007
1008 ret = -EPERM;
1009 if ((info->access & ACCESS_RO) != ACCESS_RO)
1010 goto unlock_ret;
1011
1012 ret = (dma_reg_read(ctlr, info->reg) >> info->shift) & info->mask;
1013
1014 unlock_ret:
1015 spin_unlock_irqrestore(&ctlr->lock, flags);
1016 return ret;
1017 }
1018
1019 int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value)
1020 {
1021 unsigned long flags;
1022 struct cpdma_control_info *info = &controls[control];
1023 int ret;
1024 u32 val;
1025
1026 spin_lock_irqsave(&ctlr->lock, flags);
1027
1028 ret = -ENOTSUPP;
1029 if (!ctlr->params.has_ext_regs)
1030 goto unlock_ret;
1031
1032 ret = -EINVAL;
1033 if (ctlr->state != CPDMA_STATE_ACTIVE)
1034 goto unlock_ret;
1035
1036 ret = -ENOENT;
1037 if (control < 0 || control >= ARRAY_SIZE(controls))
1038 goto unlock_ret;
1039
1040 ret = -EPERM;
1041 if ((info->access & ACCESS_WO) != ACCESS_WO)
1042 goto unlock_ret;
1043
1044 val = dma_reg_read(ctlr, info->reg);
1045 val &= ~(info->mask << info->shift);
1046 val |= (value & info->mask) << info->shift;
1047 dma_reg_write(ctlr, info->reg, val);
1048 ret = 0;
1049
1050 unlock_ret:
1051 spin_unlock_irqrestore(&ctlr->lock, flags);
1052 return ret;
1053 }
1054 EXPORT_SYMBOL_GPL(cpdma_control_set);
1055
1056 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.054164 seconds and 5 git commands to generate.