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