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drivers: net: davinci_cpdma: remove spinlock as SOFTIRQ-unsafe lock order detected
[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 phys_addr_t 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 = devm_kzalloc(dev, sizeof(*pool), GFP_KERNEL);
162 if (!pool)
163 goto fail;
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 = devm_kzalloc(dev, 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 fail:
191 return NULL;
192 }
193
194 static void cpdma_desc_pool_destroy(struct cpdma_desc_pool *pool)
195 {
196 if (!pool)
197 return;
198
199 WARN_ON(pool->used_desc);
200 if (pool->cpumap) {
201 dma_free_coherent(pool->dev, pool->mem_size, pool->cpumap,
202 pool->phys);
203 } else {
204 iounmap(pool->iomap);
205 }
206 }
207
208 static inline dma_addr_t desc_phys(struct cpdma_desc_pool *pool,
209 struct cpdma_desc __iomem *desc)
210 {
211 if (!desc)
212 return 0;
213 return pool->hw_addr + (__force long)desc - (__force long)pool->iomap;
214 }
215
216 static inline struct cpdma_desc __iomem *
217 desc_from_phys(struct cpdma_desc_pool *pool, dma_addr_t dma)
218 {
219 return dma ? pool->iomap + dma - pool->hw_addr : NULL;
220 }
221
222 static struct cpdma_desc __iomem *
223 cpdma_desc_alloc(struct cpdma_desc_pool *pool, int num_desc, bool is_rx)
224 {
225 unsigned long flags;
226 int index;
227 int desc_start;
228 int desc_end;
229 struct cpdma_desc __iomem *desc = NULL;
230
231 spin_lock_irqsave(&pool->lock, flags);
232
233 if (is_rx) {
234 desc_start = 0;
235 desc_end = pool->num_desc/2;
236 } else {
237 desc_start = pool->num_desc/2;
238 desc_end = pool->num_desc;
239 }
240
241 index = bitmap_find_next_zero_area(pool->bitmap,
242 desc_end, desc_start, num_desc, 0);
243 if (index < desc_end) {
244 bitmap_set(pool->bitmap, index, num_desc);
245 desc = pool->iomap + pool->desc_size * index;
246 pool->used_desc++;
247 }
248
249 spin_unlock_irqrestore(&pool->lock, flags);
250 return desc;
251 }
252
253 static void cpdma_desc_free(struct cpdma_desc_pool *pool,
254 struct cpdma_desc __iomem *desc, int num_desc)
255 {
256 unsigned long flags, index;
257
258 index = ((unsigned long)desc - (unsigned long)pool->iomap) /
259 pool->desc_size;
260 spin_lock_irqsave(&pool->lock, flags);
261 bitmap_clear(pool->bitmap, index, num_desc);
262 pool->used_desc--;
263 spin_unlock_irqrestore(&pool->lock, flags);
264 }
265
266 struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params)
267 {
268 struct cpdma_ctlr *ctlr;
269
270 ctlr = devm_kzalloc(params->dev, sizeof(*ctlr), GFP_KERNEL);
271 if (!ctlr)
272 return NULL;
273
274 ctlr->state = CPDMA_STATE_IDLE;
275 ctlr->params = *params;
276 ctlr->dev = params->dev;
277 spin_lock_init(&ctlr->lock);
278
279 ctlr->pool = cpdma_desc_pool_create(ctlr->dev,
280 ctlr->params.desc_mem_phys,
281 ctlr->params.desc_hw_addr,
282 ctlr->params.desc_mem_size,
283 ctlr->params.desc_align);
284 if (!ctlr->pool)
285 return NULL;
286
287 if (WARN_ON(ctlr->num_chan > CPDMA_MAX_CHANNELS))
288 ctlr->num_chan = CPDMA_MAX_CHANNELS;
289 return ctlr;
290 }
291 EXPORT_SYMBOL_GPL(cpdma_ctlr_create);
292
293 int cpdma_ctlr_start(struct cpdma_ctlr *ctlr)
294 {
295 unsigned long flags;
296 int i;
297
298 spin_lock_irqsave(&ctlr->lock, flags);
299 if (ctlr->state != CPDMA_STATE_IDLE) {
300 spin_unlock_irqrestore(&ctlr->lock, flags);
301 return -EBUSY;
302 }
303
304 if (ctlr->params.has_soft_reset) {
305 unsigned timeout = 10 * 100;
306
307 dma_reg_write(ctlr, CPDMA_SOFTRESET, 1);
308 while (timeout) {
309 if (dma_reg_read(ctlr, CPDMA_SOFTRESET) == 0)
310 break;
311 udelay(10);
312 timeout--;
313 }
314 WARN_ON(!timeout);
315 }
316
317 for (i = 0; i < ctlr->num_chan; i++) {
318 __raw_writel(0, ctlr->params.txhdp + 4 * i);
319 __raw_writel(0, ctlr->params.rxhdp + 4 * i);
320 __raw_writel(0, ctlr->params.txcp + 4 * i);
321 __raw_writel(0, ctlr->params.rxcp + 4 * i);
322 }
323
324 dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
325 dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
326
327 dma_reg_write(ctlr, CPDMA_TXCONTROL, 1);
328 dma_reg_write(ctlr, CPDMA_RXCONTROL, 1);
329
330 ctlr->state = CPDMA_STATE_ACTIVE;
331
332 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
333 if (ctlr->channels[i])
334 cpdma_chan_start(ctlr->channels[i]);
335 }
336 spin_unlock_irqrestore(&ctlr->lock, flags);
337 return 0;
338 }
339 EXPORT_SYMBOL_GPL(cpdma_ctlr_start);
340
341 int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr)
342 {
343 unsigned long flags;
344 int i;
345
346 spin_lock_irqsave(&ctlr->lock, flags);
347 if (ctlr->state == CPDMA_STATE_TEARDOWN) {
348 spin_unlock_irqrestore(&ctlr->lock, flags);
349 return -EINVAL;
350 }
351
352 ctlr->state = CPDMA_STATE_TEARDOWN;
353
354 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
355 if (ctlr->channels[i])
356 cpdma_chan_stop(ctlr->channels[i]);
357 }
358
359 dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
360 dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
361
362 dma_reg_write(ctlr, CPDMA_TXCONTROL, 0);
363 dma_reg_write(ctlr, CPDMA_RXCONTROL, 0);
364
365 ctlr->state = CPDMA_STATE_IDLE;
366
367 spin_unlock_irqrestore(&ctlr->lock, flags);
368 return 0;
369 }
370 EXPORT_SYMBOL_GPL(cpdma_ctlr_stop);
371
372 int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr)
373 {
374 struct device *dev = ctlr->dev;
375 unsigned long flags;
376 int i;
377
378 spin_lock_irqsave(&ctlr->lock, flags);
379
380 dev_info(dev, "CPDMA: state: %s", cpdma_state_str[ctlr->state]);
381
382 dev_info(dev, "CPDMA: txidver: %x",
383 dma_reg_read(ctlr, CPDMA_TXIDVER));
384 dev_info(dev, "CPDMA: txcontrol: %x",
385 dma_reg_read(ctlr, CPDMA_TXCONTROL));
386 dev_info(dev, "CPDMA: txteardown: %x",
387 dma_reg_read(ctlr, CPDMA_TXTEARDOWN));
388 dev_info(dev, "CPDMA: rxidver: %x",
389 dma_reg_read(ctlr, CPDMA_RXIDVER));
390 dev_info(dev, "CPDMA: rxcontrol: %x",
391 dma_reg_read(ctlr, CPDMA_RXCONTROL));
392 dev_info(dev, "CPDMA: softreset: %x",
393 dma_reg_read(ctlr, CPDMA_SOFTRESET));
394 dev_info(dev, "CPDMA: rxteardown: %x",
395 dma_reg_read(ctlr, CPDMA_RXTEARDOWN));
396 dev_info(dev, "CPDMA: txintstatraw: %x",
397 dma_reg_read(ctlr, CPDMA_TXINTSTATRAW));
398 dev_info(dev, "CPDMA: txintstatmasked: %x",
399 dma_reg_read(ctlr, CPDMA_TXINTSTATMASKED));
400 dev_info(dev, "CPDMA: txintmaskset: %x",
401 dma_reg_read(ctlr, CPDMA_TXINTMASKSET));
402 dev_info(dev, "CPDMA: txintmaskclear: %x",
403 dma_reg_read(ctlr, CPDMA_TXINTMASKCLEAR));
404 dev_info(dev, "CPDMA: macinvector: %x",
405 dma_reg_read(ctlr, CPDMA_MACINVECTOR));
406 dev_info(dev, "CPDMA: maceoivector: %x",
407 dma_reg_read(ctlr, CPDMA_MACEOIVECTOR));
408 dev_info(dev, "CPDMA: rxintstatraw: %x",
409 dma_reg_read(ctlr, CPDMA_RXINTSTATRAW));
410 dev_info(dev, "CPDMA: rxintstatmasked: %x",
411 dma_reg_read(ctlr, CPDMA_RXINTSTATMASKED));
412 dev_info(dev, "CPDMA: rxintmaskset: %x",
413 dma_reg_read(ctlr, CPDMA_RXINTMASKSET));
414 dev_info(dev, "CPDMA: rxintmaskclear: %x",
415 dma_reg_read(ctlr, CPDMA_RXINTMASKCLEAR));
416 dev_info(dev, "CPDMA: dmaintstatraw: %x",
417 dma_reg_read(ctlr, CPDMA_DMAINTSTATRAW));
418 dev_info(dev, "CPDMA: dmaintstatmasked: %x",
419 dma_reg_read(ctlr, CPDMA_DMAINTSTATMASKED));
420 dev_info(dev, "CPDMA: dmaintmaskset: %x",
421 dma_reg_read(ctlr, CPDMA_DMAINTMASKSET));
422 dev_info(dev, "CPDMA: dmaintmaskclear: %x",
423 dma_reg_read(ctlr, CPDMA_DMAINTMASKCLEAR));
424
425 if (!ctlr->params.has_ext_regs) {
426 dev_info(dev, "CPDMA: dmacontrol: %x",
427 dma_reg_read(ctlr, CPDMA_DMACONTROL));
428 dev_info(dev, "CPDMA: dmastatus: %x",
429 dma_reg_read(ctlr, CPDMA_DMASTATUS));
430 dev_info(dev, "CPDMA: rxbuffofs: %x",
431 dma_reg_read(ctlr, CPDMA_RXBUFFOFS));
432 }
433
434 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++)
435 if (ctlr->channels[i])
436 cpdma_chan_dump(ctlr->channels[i]);
437
438 spin_unlock_irqrestore(&ctlr->lock, flags);
439 return 0;
440 }
441 EXPORT_SYMBOL_GPL(cpdma_ctlr_dump);
442
443 int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr)
444 {
445 unsigned long flags;
446 int ret = 0, i;
447
448 if (!ctlr)
449 return -EINVAL;
450
451 spin_lock_irqsave(&ctlr->lock, flags);
452 if (ctlr->state != CPDMA_STATE_IDLE)
453 cpdma_ctlr_stop(ctlr);
454
455 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++)
456 cpdma_chan_destroy(ctlr->channels[i]);
457
458 cpdma_desc_pool_destroy(ctlr->pool);
459 spin_unlock_irqrestore(&ctlr->lock, flags);
460 return ret;
461 }
462 EXPORT_SYMBOL_GPL(cpdma_ctlr_destroy);
463
464 int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable)
465 {
466 unsigned long flags;
467 int i, reg;
468
469 spin_lock_irqsave(&ctlr->lock, flags);
470 if (ctlr->state != CPDMA_STATE_ACTIVE) {
471 spin_unlock_irqrestore(&ctlr->lock, flags);
472 return -EINVAL;
473 }
474
475 reg = enable ? CPDMA_DMAINTMASKSET : CPDMA_DMAINTMASKCLEAR;
476 dma_reg_write(ctlr, reg, CPDMA_DMAINT_HOSTERR);
477
478 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
479 if (ctlr->channels[i])
480 cpdma_chan_int_ctrl(ctlr->channels[i], enable);
481 }
482
483 spin_unlock_irqrestore(&ctlr->lock, flags);
484 return 0;
485 }
486 EXPORT_SYMBOL_GPL(cpdma_ctlr_int_ctrl);
487
488 void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value)
489 {
490 dma_reg_write(ctlr, CPDMA_MACEOIVECTOR, value);
491 }
492 EXPORT_SYMBOL_GPL(cpdma_ctlr_eoi);
493
494 struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
495 cpdma_handler_fn handler)
496 {
497 struct cpdma_chan *chan;
498 int offset = (chan_num % CPDMA_MAX_CHANNELS) * 4;
499 unsigned long flags;
500
501 if (__chan_linear(chan_num) >= ctlr->num_chan)
502 return NULL;
503
504 chan = devm_kzalloc(ctlr->dev, sizeof(*chan), GFP_KERNEL);
505 if (!chan)
506 return ERR_PTR(-ENOMEM);
507
508 spin_lock_irqsave(&ctlr->lock, flags);
509 if (ctlr->channels[chan_num]) {
510 spin_unlock_irqrestore(&ctlr->lock, flags);
511 devm_kfree(ctlr->dev, chan);
512 return ERR_PTR(-EBUSY);
513 }
514
515 chan->ctlr = ctlr;
516 chan->state = CPDMA_STATE_IDLE;
517 chan->chan_num = chan_num;
518 chan->handler = handler;
519
520 if (is_rx_chan(chan)) {
521 chan->hdp = ctlr->params.rxhdp + offset;
522 chan->cp = ctlr->params.rxcp + offset;
523 chan->rxfree = ctlr->params.rxfree + offset;
524 chan->int_set = CPDMA_RXINTMASKSET;
525 chan->int_clear = CPDMA_RXINTMASKCLEAR;
526 chan->td = CPDMA_RXTEARDOWN;
527 chan->dir = DMA_FROM_DEVICE;
528 } else {
529 chan->hdp = ctlr->params.txhdp + offset;
530 chan->cp = ctlr->params.txcp + offset;
531 chan->int_set = CPDMA_TXINTMASKSET;
532 chan->int_clear = CPDMA_TXINTMASKCLEAR;
533 chan->td = CPDMA_TXTEARDOWN;
534 chan->dir = DMA_TO_DEVICE;
535 }
536 chan->mask = BIT(chan_linear(chan));
537
538 spin_lock_init(&chan->lock);
539
540 ctlr->channels[chan_num] = chan;
541 spin_unlock_irqrestore(&ctlr->lock, flags);
542 return chan;
543 }
544 EXPORT_SYMBOL_GPL(cpdma_chan_create);
545
546 int cpdma_chan_destroy(struct cpdma_chan *chan)
547 {
548 struct cpdma_ctlr *ctlr;
549 unsigned long flags;
550
551 if (!chan)
552 return -EINVAL;
553 ctlr = chan->ctlr;
554
555 spin_lock_irqsave(&ctlr->lock, flags);
556 if (chan->state != CPDMA_STATE_IDLE)
557 cpdma_chan_stop(chan);
558 ctlr->channels[chan->chan_num] = NULL;
559 spin_unlock_irqrestore(&ctlr->lock, flags);
560 return 0;
561 }
562 EXPORT_SYMBOL_GPL(cpdma_chan_destroy);
563
564 int cpdma_chan_get_stats(struct cpdma_chan *chan,
565 struct cpdma_chan_stats *stats)
566 {
567 unsigned long flags;
568 if (!chan)
569 return -EINVAL;
570 spin_lock_irqsave(&chan->lock, flags);
571 memcpy(stats, &chan->stats, sizeof(*stats));
572 spin_unlock_irqrestore(&chan->lock, flags);
573 return 0;
574 }
575 EXPORT_SYMBOL_GPL(cpdma_chan_get_stats);
576
577 int cpdma_chan_dump(struct cpdma_chan *chan)
578 {
579 unsigned long flags;
580 struct device *dev = chan->ctlr->dev;
581
582 spin_lock_irqsave(&chan->lock, flags);
583
584 dev_info(dev, "channel %d (%s %d) state %s",
585 chan->chan_num, is_rx_chan(chan) ? "rx" : "tx",
586 chan_linear(chan), cpdma_state_str[chan->state]);
587 dev_info(dev, "\thdp: %x\n", chan_read(chan, hdp));
588 dev_info(dev, "\tcp: %x\n", chan_read(chan, cp));
589 if (chan->rxfree) {
590 dev_info(dev, "\trxfree: %x\n",
591 chan_read(chan, rxfree));
592 }
593
594 dev_info(dev, "\tstats head_enqueue: %d\n",
595 chan->stats.head_enqueue);
596 dev_info(dev, "\tstats tail_enqueue: %d\n",
597 chan->stats.tail_enqueue);
598 dev_info(dev, "\tstats pad_enqueue: %d\n",
599 chan->stats.pad_enqueue);
600 dev_info(dev, "\tstats misqueued: %d\n",
601 chan->stats.misqueued);
602 dev_info(dev, "\tstats desc_alloc_fail: %d\n",
603 chan->stats.desc_alloc_fail);
604 dev_info(dev, "\tstats pad_alloc_fail: %d\n",
605 chan->stats.pad_alloc_fail);
606 dev_info(dev, "\tstats runt_receive_buff: %d\n",
607 chan->stats.runt_receive_buff);
608 dev_info(dev, "\tstats runt_transmit_buff: %d\n",
609 chan->stats.runt_transmit_buff);
610 dev_info(dev, "\tstats empty_dequeue: %d\n",
611 chan->stats.empty_dequeue);
612 dev_info(dev, "\tstats busy_dequeue: %d\n",
613 chan->stats.busy_dequeue);
614 dev_info(dev, "\tstats good_dequeue: %d\n",
615 chan->stats.good_dequeue);
616 dev_info(dev, "\tstats requeue: %d\n",
617 chan->stats.requeue);
618 dev_info(dev, "\tstats teardown_dequeue: %d\n",
619 chan->stats.teardown_dequeue);
620
621 spin_unlock_irqrestore(&chan->lock, flags);
622 return 0;
623 }
624
625 static void __cpdma_chan_submit(struct cpdma_chan *chan,
626 struct cpdma_desc __iomem *desc)
627 {
628 struct cpdma_ctlr *ctlr = chan->ctlr;
629 struct cpdma_desc __iomem *prev = chan->tail;
630 struct cpdma_desc_pool *pool = ctlr->pool;
631 dma_addr_t desc_dma;
632 u32 mode;
633
634 desc_dma = desc_phys(pool, desc);
635
636 /* simple case - idle channel */
637 if (!chan->head) {
638 chan->stats.head_enqueue++;
639 chan->head = desc;
640 chan->tail = desc;
641 if (chan->state == CPDMA_STATE_ACTIVE)
642 chan_write(chan, hdp, desc_dma);
643 return;
644 }
645
646 /* first chain the descriptor at the tail of the list */
647 desc_write(prev, hw_next, desc_dma);
648 chan->tail = desc;
649 chan->stats.tail_enqueue++;
650
651 /* next check if EOQ has been triggered already */
652 mode = desc_read(prev, hw_mode);
653 if (((mode & (CPDMA_DESC_EOQ | CPDMA_DESC_OWNER)) == CPDMA_DESC_EOQ) &&
654 (chan->state == CPDMA_STATE_ACTIVE)) {
655 desc_write(prev, hw_mode, mode & ~CPDMA_DESC_EOQ);
656 chan_write(chan, hdp, desc_dma);
657 chan->stats.misqueued++;
658 }
659 }
660
661 int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
662 int len, int directed)
663 {
664 struct cpdma_ctlr *ctlr = chan->ctlr;
665 struct cpdma_desc __iomem *desc;
666 dma_addr_t buffer;
667 unsigned long flags;
668 u32 mode;
669 int ret = 0;
670
671 spin_lock_irqsave(&chan->lock, flags);
672
673 if (chan->state == CPDMA_STATE_TEARDOWN) {
674 ret = -EINVAL;
675 goto unlock_ret;
676 }
677
678 desc = cpdma_desc_alloc(ctlr->pool, 1, is_rx_chan(chan));
679 if (!desc) {
680 chan->stats.desc_alloc_fail++;
681 ret = -ENOMEM;
682 goto unlock_ret;
683 }
684
685 if (len < ctlr->params.min_packet_size) {
686 len = ctlr->params.min_packet_size;
687 chan->stats.runt_transmit_buff++;
688 }
689
690 buffer = dma_map_single(ctlr->dev, data, len, chan->dir);
691 ret = dma_mapping_error(ctlr->dev, buffer);
692 if (ret) {
693 cpdma_desc_free(ctlr->pool, desc, 1);
694 ret = -EINVAL;
695 goto unlock_ret;
696 }
697
698 mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
699 cpdma_desc_to_port(chan, mode, directed);
700
701 desc_write(desc, hw_next, 0);
702 desc_write(desc, hw_buffer, buffer);
703 desc_write(desc, hw_len, len);
704 desc_write(desc, hw_mode, mode | len);
705 desc_write(desc, sw_token, token);
706 desc_write(desc, sw_buffer, buffer);
707 desc_write(desc, sw_len, len);
708
709 __cpdma_chan_submit(chan, desc);
710
711 if (chan->state == CPDMA_STATE_ACTIVE && chan->rxfree)
712 chan_write(chan, rxfree, 1);
713
714 chan->count++;
715
716 unlock_ret:
717 spin_unlock_irqrestore(&chan->lock, flags);
718 return ret;
719 }
720 EXPORT_SYMBOL_GPL(cpdma_chan_submit);
721
722 bool cpdma_check_free_tx_desc(struct cpdma_chan *chan)
723 {
724 unsigned long flags;
725 int index;
726 bool ret;
727 struct cpdma_ctlr *ctlr = chan->ctlr;
728 struct cpdma_desc_pool *pool = ctlr->pool;
729
730 spin_lock_irqsave(&pool->lock, flags);
731
732 index = bitmap_find_next_zero_area(pool->bitmap,
733 pool->num_desc, pool->num_desc/2, 1, 0);
734
735 if (index < pool->num_desc)
736 ret = true;
737 else
738 ret = false;
739
740 spin_unlock_irqrestore(&pool->lock, flags);
741 return ret;
742 }
743 EXPORT_SYMBOL_GPL(cpdma_check_free_tx_desc);
744
745 static void __cpdma_chan_free(struct cpdma_chan *chan,
746 struct cpdma_desc __iomem *desc,
747 int outlen, int status)
748 {
749 struct cpdma_ctlr *ctlr = chan->ctlr;
750 struct cpdma_desc_pool *pool = ctlr->pool;
751 dma_addr_t buff_dma;
752 int origlen;
753 void *token;
754
755 token = (void *)desc_read(desc, sw_token);
756 buff_dma = desc_read(desc, sw_buffer);
757 origlen = desc_read(desc, sw_len);
758
759 dma_unmap_single(ctlr->dev, buff_dma, origlen, chan->dir);
760 cpdma_desc_free(pool, desc, 1);
761 (*chan->handler)(token, outlen, status);
762 }
763
764 static int __cpdma_chan_process(struct cpdma_chan *chan)
765 {
766 struct cpdma_ctlr *ctlr = chan->ctlr;
767 struct cpdma_desc __iomem *desc;
768 int status, outlen;
769 int cb_status = 0;
770 struct cpdma_desc_pool *pool = ctlr->pool;
771 dma_addr_t desc_dma;
772 unsigned long flags;
773
774 spin_lock_irqsave(&chan->lock, flags);
775
776 desc = chan->head;
777 if (!desc) {
778 chan->stats.empty_dequeue++;
779 status = -ENOENT;
780 goto unlock_ret;
781 }
782 desc_dma = desc_phys(pool, desc);
783
784 status = __raw_readl(&desc->hw_mode);
785 outlen = status & 0x7ff;
786 if (status & CPDMA_DESC_OWNER) {
787 chan->stats.busy_dequeue++;
788 status = -EBUSY;
789 goto unlock_ret;
790 }
791
792 if (status & CPDMA_DESC_PASS_CRC)
793 outlen -= CPDMA_DESC_CRC_LEN;
794
795 status = status & (CPDMA_DESC_EOQ | CPDMA_DESC_TD_COMPLETE |
796 CPDMA_DESC_PORT_MASK);
797
798 chan->head = desc_from_phys(pool, desc_read(desc, hw_next));
799 chan_write(chan, cp, desc_dma);
800 chan->count--;
801 chan->stats.good_dequeue++;
802
803 if (status & CPDMA_DESC_EOQ) {
804 chan->stats.requeue++;
805 chan_write(chan, hdp, desc_phys(pool, chan->head));
806 }
807
808 spin_unlock_irqrestore(&chan->lock, flags);
809 if (unlikely(status & CPDMA_DESC_TD_COMPLETE))
810 cb_status = -ENOSYS;
811 else
812 cb_status = status;
813
814 __cpdma_chan_free(chan, desc, outlen, cb_status);
815 return status;
816
817 unlock_ret:
818 spin_unlock_irqrestore(&chan->lock, flags);
819 return status;
820 }
821
822 int cpdma_chan_process(struct cpdma_chan *chan, int quota)
823 {
824 int used = 0, ret = 0;
825
826 if (chan->state != CPDMA_STATE_ACTIVE)
827 return -EINVAL;
828
829 while (used < quota) {
830 ret = __cpdma_chan_process(chan);
831 if (ret < 0)
832 break;
833 used++;
834 }
835 return used;
836 }
837 EXPORT_SYMBOL_GPL(cpdma_chan_process);
838
839 int cpdma_chan_start(struct cpdma_chan *chan)
840 {
841 struct cpdma_ctlr *ctlr = chan->ctlr;
842 struct cpdma_desc_pool *pool = ctlr->pool;
843 unsigned long flags;
844
845 spin_lock_irqsave(&chan->lock, flags);
846 if (chan->state != CPDMA_STATE_IDLE) {
847 spin_unlock_irqrestore(&chan->lock, flags);
848 return -EBUSY;
849 }
850 if (ctlr->state != CPDMA_STATE_ACTIVE) {
851 spin_unlock_irqrestore(&chan->lock, flags);
852 return -EINVAL;
853 }
854 dma_reg_write(ctlr, chan->int_set, chan->mask);
855 chan->state = CPDMA_STATE_ACTIVE;
856 if (chan->head) {
857 chan_write(chan, hdp, desc_phys(pool, chan->head));
858 if (chan->rxfree)
859 chan_write(chan, rxfree, chan->count);
860 }
861
862 spin_unlock_irqrestore(&chan->lock, flags);
863 return 0;
864 }
865 EXPORT_SYMBOL_GPL(cpdma_chan_start);
866
867 int cpdma_chan_stop(struct cpdma_chan *chan)
868 {
869 struct cpdma_ctlr *ctlr = chan->ctlr;
870 struct cpdma_desc_pool *pool = ctlr->pool;
871 unsigned long flags;
872 int ret;
873 unsigned timeout;
874
875 spin_lock_irqsave(&chan->lock, flags);
876 if (chan->state == CPDMA_STATE_TEARDOWN) {
877 spin_unlock_irqrestore(&chan->lock, flags);
878 return -EINVAL;
879 }
880
881 chan->state = CPDMA_STATE_TEARDOWN;
882 dma_reg_write(ctlr, chan->int_clear, chan->mask);
883
884 /* trigger teardown */
885 dma_reg_write(ctlr, chan->td, chan_linear(chan));
886
887 /* wait for teardown complete */
888 timeout = 100 * 100; /* 100 ms */
889 while (timeout) {
890 u32 cp = chan_read(chan, cp);
891 if ((cp & CPDMA_TEARDOWN_VALUE) == CPDMA_TEARDOWN_VALUE)
892 break;
893 udelay(10);
894 timeout--;
895 }
896 WARN_ON(!timeout);
897 chan_write(chan, cp, CPDMA_TEARDOWN_VALUE);
898
899 /* handle completed packets */
900 spin_unlock_irqrestore(&chan->lock, flags);
901 do {
902 ret = __cpdma_chan_process(chan);
903 if (ret < 0)
904 break;
905 } while ((ret & CPDMA_DESC_TD_COMPLETE) == 0);
906 spin_lock_irqsave(&chan->lock, flags);
907
908 /* remaining packets haven't been tx/rx'ed, clean them up */
909 while (chan->head) {
910 struct cpdma_desc __iomem *desc = chan->head;
911 dma_addr_t next_dma;
912
913 next_dma = desc_read(desc, hw_next);
914 chan->head = desc_from_phys(pool, next_dma);
915 chan->count--;
916 chan->stats.teardown_dequeue++;
917
918 /* issue callback without locks held */
919 spin_unlock_irqrestore(&chan->lock, flags);
920 __cpdma_chan_free(chan, desc, 0, -ENOSYS);
921 spin_lock_irqsave(&chan->lock, flags);
922 }
923
924 chan->state = CPDMA_STATE_IDLE;
925 spin_unlock_irqrestore(&chan->lock, flags);
926 return 0;
927 }
928 EXPORT_SYMBOL_GPL(cpdma_chan_stop);
929
930 int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable)
931 {
932 unsigned long flags;
933
934 spin_lock_irqsave(&chan->lock, flags);
935 if (chan->state != CPDMA_STATE_ACTIVE) {
936 spin_unlock_irqrestore(&chan->lock, flags);
937 return -EINVAL;
938 }
939
940 dma_reg_write(chan->ctlr, enable ? chan->int_set : chan->int_clear,
941 chan->mask);
942 spin_unlock_irqrestore(&chan->lock, flags);
943
944 return 0;
945 }
946
947 struct cpdma_control_info {
948 u32 reg;
949 u32 shift, mask;
950 int access;
951 #define ACCESS_RO BIT(0)
952 #define ACCESS_WO BIT(1)
953 #define ACCESS_RW (ACCESS_RO | ACCESS_WO)
954 };
955
956 static struct cpdma_control_info controls[] = {
957 [CPDMA_CMD_IDLE] = {CPDMA_DMACONTROL, 3, 1, ACCESS_WO},
958 [CPDMA_COPY_ERROR_FRAMES] = {CPDMA_DMACONTROL, 4, 1, ACCESS_RW},
959 [CPDMA_RX_OFF_LEN_UPDATE] = {CPDMA_DMACONTROL, 2, 1, ACCESS_RW},
960 [CPDMA_RX_OWNERSHIP_FLIP] = {CPDMA_DMACONTROL, 1, 1, ACCESS_RW},
961 [CPDMA_TX_PRIO_FIXED] = {CPDMA_DMACONTROL, 0, 1, ACCESS_RW},
962 [CPDMA_STAT_IDLE] = {CPDMA_DMASTATUS, 31, 1, ACCESS_RO},
963 [CPDMA_STAT_TX_ERR_CODE] = {CPDMA_DMASTATUS, 20, 0xf, ACCESS_RW},
964 [CPDMA_STAT_TX_ERR_CHAN] = {CPDMA_DMASTATUS, 16, 0x7, ACCESS_RW},
965 [CPDMA_STAT_RX_ERR_CODE] = {CPDMA_DMASTATUS, 12, 0xf, ACCESS_RW},
966 [CPDMA_STAT_RX_ERR_CHAN] = {CPDMA_DMASTATUS, 8, 0x7, ACCESS_RW},
967 [CPDMA_RX_BUFFER_OFFSET] = {CPDMA_RXBUFFOFS, 0, 0xffff, ACCESS_RW},
968 };
969
970 int cpdma_control_get(struct cpdma_ctlr *ctlr, int control)
971 {
972 unsigned long flags;
973 struct cpdma_control_info *info = &controls[control];
974 int ret;
975
976 spin_lock_irqsave(&ctlr->lock, flags);
977
978 ret = -ENOTSUPP;
979 if (!ctlr->params.has_ext_regs)
980 goto unlock_ret;
981
982 ret = -EINVAL;
983 if (ctlr->state != CPDMA_STATE_ACTIVE)
984 goto unlock_ret;
985
986 ret = -ENOENT;
987 if (control < 0 || control >= ARRAY_SIZE(controls))
988 goto unlock_ret;
989
990 ret = -EPERM;
991 if ((info->access & ACCESS_RO) != ACCESS_RO)
992 goto unlock_ret;
993
994 ret = (dma_reg_read(ctlr, info->reg) >> info->shift) & info->mask;
995
996 unlock_ret:
997 spin_unlock_irqrestore(&ctlr->lock, flags);
998 return ret;
999 }
1000
1001 int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value)
1002 {
1003 unsigned long flags;
1004 struct cpdma_control_info *info = &controls[control];
1005 int ret;
1006 u32 val;
1007
1008 spin_lock_irqsave(&ctlr->lock, flags);
1009
1010 ret = -ENOTSUPP;
1011 if (!ctlr->params.has_ext_regs)
1012 goto unlock_ret;
1013
1014 ret = -EINVAL;
1015 if (ctlr->state != CPDMA_STATE_ACTIVE)
1016 goto unlock_ret;
1017
1018 ret = -ENOENT;
1019 if (control < 0 || control >= ARRAY_SIZE(controls))
1020 goto unlock_ret;
1021
1022 ret = -EPERM;
1023 if ((info->access & ACCESS_WO) != ACCESS_WO)
1024 goto unlock_ret;
1025
1026 val = dma_reg_read(ctlr, info->reg);
1027 val &= ~(info->mask << info->shift);
1028 val |= (value & info->mask) << info->shift;
1029 dma_reg_write(ctlr, info->reg, val);
1030 ret = 0;
1031
1032 unlock_ret:
1033 spin_unlock_irqrestore(&ctlr->lock, flags);
1034 return ret;
1035 }
1036 EXPORT_SYMBOL_GPL(cpdma_control_set);
1037
1038 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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