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ARM: PL08x: ensure loops use cpu_relax()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / davinci_cpdma.c
blobe92b2b6cd8c4841733f829c9afa3f48b7e60f0de
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/slab.h>
19 #include <linux/err.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/io.h>
22
23 #include "davinci_cpdma.h"
24
25 /* DMA Registers */
26 #define CPDMA_TXIDVER 0x00
27 #define CPDMA_TXCONTROL 0x04
28 #define CPDMA_TXTEARDOWN 0x08
29 #define CPDMA_RXIDVER 0x10
30 #define CPDMA_RXCONTROL 0x14
31 #define CPDMA_SOFTRESET 0x1c
32 #define CPDMA_RXTEARDOWN 0x18
33 #define CPDMA_TXINTSTATRAW 0x80
34 #define CPDMA_TXINTSTATMASKED 0x84
35 #define CPDMA_TXINTMASKSET 0x88
36 #define CPDMA_TXINTMASKCLEAR 0x8c
37 #define CPDMA_MACINVECTOR 0x90
38 #define CPDMA_MACEOIVECTOR 0x94
39 #define CPDMA_RXINTSTATRAW 0xa0
40 #define CPDMA_RXINTSTATMASKED 0xa4
41 #define CPDMA_RXINTMASKSET 0xa8
42 #define CPDMA_RXINTMASKCLEAR 0xac
43 #define CPDMA_DMAINTSTATRAW 0xb0
44 #define CPDMA_DMAINTSTATMASKED 0xb4
45 #define CPDMA_DMAINTMASKSET 0xb8
46 #define CPDMA_DMAINTMASKCLEAR 0xbc
47 #define CPDMA_DMAINT_HOSTERR BIT(1)
48
49 /* the following exist only if has_ext_regs is set */
50 #define CPDMA_DMACONTROL 0x20
51 #define CPDMA_DMASTATUS 0x24
52 #define CPDMA_RXBUFFOFS 0x28
53 #define CPDMA_EM_CONTROL 0x2c
54
55 /* Descriptor mode bits */
56 #define CPDMA_DESC_SOP BIT(31)
57 #define CPDMA_DESC_EOP BIT(30)
58 #define CPDMA_DESC_OWNER BIT(29)
59 #define CPDMA_DESC_EOQ BIT(28)
60 #define CPDMA_DESC_TD_COMPLETE BIT(27)
61 #define CPDMA_DESC_PASS_CRC BIT(26)
62
63 #define CPDMA_TEARDOWN_VALUE 0xfffffffc
64
65 struct cpdma_desc {
66 /* hardware fields */
67 u32 hw_next;
68 u32 hw_buffer;
69 u32 hw_len;
70 u32 hw_mode;
71 /* software fields */
72 void *sw_token;
73 u32 sw_buffer;
74 u32 sw_len;
75 };
76
77 struct cpdma_desc_pool {
78 u32 phys;
79 void __iomem *iomap; /* ioremap map */
80 void *cpumap; /* dma_alloc map */
81 int desc_size, mem_size;
82 int num_desc, used_desc;
83 unsigned long *bitmap;
84 struct device *dev;
85 spinlock_t lock;
86 };
87
88 enum cpdma_state {
89 CPDMA_STATE_IDLE,
90 CPDMA_STATE_ACTIVE,
91 CPDMA_STATE_TEARDOWN,
92 };
93
94 const char *cpdma_state_str[] = { "idle", "active", "teardown" };
95
96 struct cpdma_ctlr {
97 enum cpdma_state state;
98 struct cpdma_params params;
99 struct device *dev;
100 struct cpdma_desc_pool *pool;
101 spinlock_t lock;
102 struct cpdma_chan *channels[2 * CPDMA_MAX_CHANNELS];
103 };
104
105 struct cpdma_chan {
106 enum cpdma_state state;
107 struct cpdma_ctlr *ctlr;
108 int chan_num;
109 spinlock_t lock;
110 struct cpdma_desc __iomem *head, *tail;
111 int count;
112 void __iomem *hdp, *cp, *rxfree;
113 u32 mask;
114 cpdma_handler_fn handler;
115 enum dma_data_direction dir;
116 struct cpdma_chan_stats stats;
117 /* offsets into dmaregs */
118 int int_set, int_clear, td;
119 };
120
121 /* The following make access to common cpdma_ctlr params more readable */
122 #define dmaregs params.dmaregs
123 #define num_chan params.num_chan
124
125 /* various accessors */
126 #define dma_reg_read(ctlr, ofs) __raw_readl((ctlr)->dmaregs + (ofs))
127 #define chan_read(chan, fld) __raw_readl((chan)->fld)
128 #define desc_read(desc, fld) __raw_readl(&(desc)->fld)
129 #define dma_reg_write(ctlr, ofs, v) __raw_writel(v, (ctlr)->dmaregs + (ofs))
130 #define chan_write(chan, fld, v) __raw_writel(v, (chan)->fld)
131 #define desc_write(desc, fld, v) __raw_writel((u32)(v), &(desc)->fld)
132
133 /*
134 * Utility constructs for a cpdma descriptor pool. Some devices (e.g. davinci
135 * emac) have dedicated on-chip memory for these descriptors. Some other
136 * devices (e.g. cpsw switches) use plain old memory. Descriptor pools
137 * abstract out these details
138 */
139 static struct cpdma_desc_pool *
140 cpdma_desc_pool_create(struct device *dev, u32 phys, int size, int align)
141 {
142 int bitmap_size;
143 struct cpdma_desc_pool *pool;
144
145 pool = kzalloc(sizeof(*pool), GFP_KERNEL);
146 if (!pool)
147 return NULL;
148
149 spin_lock_init(&pool->lock);
150
151 pool->dev = dev;
152 pool->mem_size = size;
153 pool->desc_size = ALIGN(sizeof(struct cpdma_desc), align);
154 pool->num_desc = size / pool->desc_size;
155
156 bitmap_size = (pool->num_desc / BITS_PER_LONG) * sizeof(long);
157 pool->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
158 if (!pool->bitmap)
159 goto fail;
160
161 if (phys) {
162 pool->phys = phys;
163 pool->iomap = ioremap(phys, size);
164 } else {
165 pool->cpumap = dma_alloc_coherent(dev, size, &pool->phys,
166 GFP_KERNEL);
167 pool->iomap = (void __force __iomem *)pool->cpumap;
168 }
169
170 if (pool->iomap)
171 return pool;
172
173 fail:
174 kfree(pool->bitmap);
175 kfree(pool);
176 return NULL;
177 }
178
179 static void cpdma_desc_pool_destroy(struct cpdma_desc_pool *pool)
180 {
181 unsigned long flags;
182
183 if (!pool)
184 return;
185
186 spin_lock_irqsave(&pool->lock, flags);
187 WARN_ON(pool->used_desc);
188 kfree(pool->bitmap);
189 if (pool->cpumap) {
190 dma_free_coherent(pool->dev, pool->mem_size, pool->cpumap,
191 pool->phys);
192 } else {
193 iounmap(pool->iomap);
194 }
195 spin_unlock_irqrestore(&pool->lock, flags);
196 kfree(pool);
197 }
198
199 static inline dma_addr_t desc_phys(struct cpdma_desc_pool *pool,
200 struct cpdma_desc __iomem *desc)
201 {
202 if (!desc)
203 return 0;
204 return pool->phys + (__force dma_addr_t)desc -
205 (__force dma_addr_t)pool->iomap;
206 }
207
208 static inline struct cpdma_desc __iomem *
209 desc_from_phys(struct cpdma_desc_pool *pool, dma_addr_t dma)
210 {
211 return dma ? pool->iomap + dma - pool->phys : NULL;
212 }
213
214 static struct cpdma_desc __iomem *
215 cpdma_desc_alloc(struct cpdma_desc_pool *pool, int num_desc)
216 {
217 unsigned long flags;
218 int index;
219 struct cpdma_desc __iomem *desc = NULL;
220
221 spin_lock_irqsave(&pool->lock, flags);
222
223 index = bitmap_find_next_zero_area(pool->bitmap, pool->num_desc, 0,
224 num_desc, 0);
225 if (index < pool->num_desc) {
226 bitmap_set(pool->bitmap, index, num_desc);
227 desc = pool->iomap + pool->desc_size * index;
228 pool->used_desc++;
229 }
230
231 spin_unlock_irqrestore(&pool->lock, flags);
232 return desc;
233 }
234
235 static void cpdma_desc_free(struct cpdma_desc_pool *pool,
236 struct cpdma_desc __iomem *desc, int num_desc)
237 {
238 unsigned long flags, index;
239
240 index = ((unsigned long)desc - (unsigned long)pool->iomap) /
241 pool->desc_size;
242 spin_lock_irqsave(&pool->lock, flags);
243 bitmap_clear(pool->bitmap, index, num_desc);
244 pool->used_desc--;
245 spin_unlock_irqrestore(&pool->lock, flags);
246 }
247
248 struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params)
249 {
250 struct cpdma_ctlr *ctlr;
251
252 ctlr = kzalloc(sizeof(*ctlr), GFP_KERNEL);
253 if (!ctlr)
254 return NULL;
255
256 ctlr->state = CPDMA_STATE_IDLE;
257 ctlr->params = *params;
258 ctlr->dev = params->dev;
259 spin_lock_init(&ctlr->lock);
260
261 ctlr->pool = cpdma_desc_pool_create(ctlr->dev,
262 ctlr->params.desc_mem_phys,
263 ctlr->params.desc_mem_size,
264 ctlr->params.desc_align);
265 if (!ctlr->pool) {
266 kfree(ctlr);
267 return NULL;
268 }
269
270 if (WARN_ON(ctlr->num_chan > CPDMA_MAX_CHANNELS))
271 ctlr->num_chan = CPDMA_MAX_CHANNELS;
272 return ctlr;
273 }
274
275 int cpdma_ctlr_start(struct cpdma_ctlr *ctlr)
276 {
277 unsigned long flags;
278 int i;
279
280 spin_lock_irqsave(&ctlr->lock, flags);
281 if (ctlr->state != CPDMA_STATE_IDLE) {
282 spin_unlock_irqrestore(&ctlr->lock, flags);
283 return -EBUSY;
284 }
285
286 if (ctlr->params.has_soft_reset) {
287 unsigned long timeout = jiffies + HZ/10;
288
289 dma_reg_write(ctlr, CPDMA_SOFTRESET, 1);
290 while (time_before(jiffies, timeout)) {
291 if (dma_reg_read(ctlr, CPDMA_SOFTRESET) == 0)
292 break;
293 }
294 WARN_ON(!time_before(jiffies, timeout));
295 }
296
297 for (i = 0; i < ctlr->num_chan; i++) {
298 __raw_writel(0, ctlr->params.txhdp + 4 * i);
299 __raw_writel(0, ctlr->params.rxhdp + 4 * i);
300 __raw_writel(0, ctlr->params.txcp + 4 * i);
301 __raw_writel(0, ctlr->params.rxcp + 4 * i);
302 }
303
304 dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
305 dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
306
307 dma_reg_write(ctlr, CPDMA_TXCONTROL, 1);
308 dma_reg_write(ctlr, CPDMA_RXCONTROL, 1);
309
310 ctlr->state = CPDMA_STATE_ACTIVE;
311
312 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
313 if (ctlr->channels[i])
314 cpdma_chan_start(ctlr->channels[i]);
315 }
316 spin_unlock_irqrestore(&ctlr->lock, flags);
317 return 0;
318 }
319
320 int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr)
321 {
322 unsigned long flags;
323 int i;
324
325 spin_lock_irqsave(&ctlr->lock, flags);
326 if (ctlr->state != CPDMA_STATE_ACTIVE) {
327 spin_unlock_irqrestore(&ctlr->lock, flags);
328 return -EINVAL;
329 }
330
331 ctlr->state = CPDMA_STATE_TEARDOWN;
332
333 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
334 if (ctlr->channels[i])
335 cpdma_chan_stop(ctlr->channels[i]);
336 }
337
338 dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
339 dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
340
341 dma_reg_write(ctlr, CPDMA_TXCONTROL, 0);
342 dma_reg_write(ctlr, CPDMA_RXCONTROL, 0);
343
344 ctlr->state = CPDMA_STATE_IDLE;
345
346 spin_unlock_irqrestore(&ctlr->lock, flags);
347 return 0;
348 }
349
350 int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr)
351 {
352 struct device *dev = ctlr->dev;
353 unsigned long flags;
354 int i;
355
356 spin_lock_irqsave(&ctlr->lock, flags);
357
358 dev_info(dev, "CPDMA: state: %s", cpdma_state_str[ctlr->state]);
359
360 dev_info(dev, "CPDMA: txidver: %x",
361 dma_reg_read(ctlr, CPDMA_TXIDVER));
362 dev_info(dev, "CPDMA: txcontrol: %x",
363 dma_reg_read(ctlr, CPDMA_TXCONTROL));
364 dev_info(dev, "CPDMA: txteardown: %x",
365 dma_reg_read(ctlr, CPDMA_TXTEARDOWN));
366 dev_info(dev, "CPDMA: rxidver: %x",
367 dma_reg_read(ctlr, CPDMA_RXIDVER));
368 dev_info(dev, "CPDMA: rxcontrol: %x",
369 dma_reg_read(ctlr, CPDMA_RXCONTROL));
370 dev_info(dev, "CPDMA: softreset: %x",
371 dma_reg_read(ctlr, CPDMA_SOFTRESET));
372 dev_info(dev, "CPDMA: rxteardown: %x",
373 dma_reg_read(ctlr, CPDMA_RXTEARDOWN));
374 dev_info(dev, "CPDMA: txintstatraw: %x",
375 dma_reg_read(ctlr, CPDMA_TXINTSTATRAW));
376 dev_info(dev, "CPDMA: txintstatmasked: %x",
377 dma_reg_read(ctlr, CPDMA_TXINTSTATMASKED));
378 dev_info(dev, "CPDMA: txintmaskset: %x",
379 dma_reg_read(ctlr, CPDMA_TXINTMASKSET));
380 dev_info(dev, "CPDMA: txintmaskclear: %x",
381 dma_reg_read(ctlr, CPDMA_TXINTMASKCLEAR));
382 dev_info(dev, "CPDMA: macinvector: %x",
383 dma_reg_read(ctlr, CPDMA_MACINVECTOR));
384 dev_info(dev, "CPDMA: maceoivector: %x",
385 dma_reg_read(ctlr, CPDMA_MACEOIVECTOR));
386 dev_info(dev, "CPDMA: rxintstatraw: %x",
387 dma_reg_read(ctlr, CPDMA_RXINTSTATRAW));
388 dev_info(dev, "CPDMA: rxintstatmasked: %x",
389 dma_reg_read(ctlr, CPDMA_RXINTSTATMASKED));
390 dev_info(dev, "CPDMA: rxintmaskset: %x",
391 dma_reg_read(ctlr, CPDMA_RXINTMASKSET));
392 dev_info(dev, "CPDMA: rxintmaskclear: %x",
393 dma_reg_read(ctlr, CPDMA_RXINTMASKCLEAR));
394 dev_info(dev, "CPDMA: dmaintstatraw: %x",
395 dma_reg_read(ctlr, CPDMA_DMAINTSTATRAW));
396 dev_info(dev, "CPDMA: dmaintstatmasked: %x",
397 dma_reg_read(ctlr, CPDMA_DMAINTSTATMASKED));
398 dev_info(dev, "CPDMA: dmaintmaskset: %x",
399 dma_reg_read(ctlr, CPDMA_DMAINTMASKSET));
400 dev_info(dev, "CPDMA: dmaintmaskclear: %x",
401 dma_reg_read(ctlr, CPDMA_DMAINTMASKCLEAR));
402
403 if (!ctlr->params.has_ext_regs) {
404 dev_info(dev, "CPDMA: dmacontrol: %x",
405 dma_reg_read(ctlr, CPDMA_DMACONTROL));
406 dev_info(dev, "CPDMA: dmastatus: %x",
407 dma_reg_read(ctlr, CPDMA_DMASTATUS));
408 dev_info(dev, "CPDMA: rxbuffofs: %x",
409 dma_reg_read(ctlr, CPDMA_RXBUFFOFS));
410 }
411
412 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++)
413 if (ctlr->channels[i])
414 cpdma_chan_dump(ctlr->channels[i]);
415
416 spin_unlock_irqrestore(&ctlr->lock, flags);
417 return 0;
418 }
419
420 int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr)
421 {
422 unsigned long flags;
423 int ret = 0, i;
424
425 if (!ctlr)
426 return -EINVAL;
427
428 spin_lock_irqsave(&ctlr->lock, flags);
429 if (ctlr->state != CPDMA_STATE_IDLE)
430 cpdma_ctlr_stop(ctlr);
431
432 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
433 if (ctlr->channels[i])
434 cpdma_chan_destroy(ctlr->channels[i]);
435 }
436
437 cpdma_desc_pool_destroy(ctlr->pool);
438 spin_unlock_irqrestore(&ctlr->lock, flags);
439 kfree(ctlr);
440 return ret;
441 }
442
443 int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable)
444 {
445 unsigned long flags;
446 int i, reg;
447
448 spin_lock_irqsave(&ctlr->lock, flags);
449 if (ctlr->state != CPDMA_STATE_ACTIVE) {
450 spin_unlock_irqrestore(&ctlr->lock, flags);
451 return -EINVAL;
452 }
453
454 reg = enable ? CPDMA_DMAINTMASKSET : CPDMA_DMAINTMASKCLEAR;
455 dma_reg_write(ctlr, reg, CPDMA_DMAINT_HOSTERR);
456
457 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
458 if (ctlr->channels[i])
459 cpdma_chan_int_ctrl(ctlr->channels[i], enable);
460 }
461
462 spin_unlock_irqrestore(&ctlr->lock, flags);
463 return 0;
464 }
465
466 void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr)
467 {
468 dma_reg_write(ctlr, CPDMA_MACEOIVECTOR, 0);
469 }
470
471 struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
472 cpdma_handler_fn handler)
473 {
474 struct cpdma_chan *chan;
475 int ret, offset = (chan_num % CPDMA_MAX_CHANNELS) * 4;
476 unsigned long flags;
477
478 if (__chan_linear(chan_num) >= ctlr->num_chan)
479 return NULL;
480
481 ret = -ENOMEM;
482 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
483 if (!chan)
484 goto err_chan_alloc;
485
486 spin_lock_irqsave(&ctlr->lock, flags);
487 ret = -EBUSY;
488 if (ctlr->channels[chan_num])
489 goto err_chan_busy;
490
491 chan->ctlr = ctlr;
492 chan->state = CPDMA_STATE_IDLE;
493 chan->chan_num = chan_num;
494 chan->handler = handler;
495
496 if (is_rx_chan(chan)) {
497 chan->hdp = ctlr->params.rxhdp + offset;
498 chan->cp = ctlr->params.rxcp + offset;
499 chan->rxfree = ctlr->params.rxfree + offset;
500 chan->int_set = CPDMA_RXINTMASKSET;
501 chan->int_clear = CPDMA_RXINTMASKCLEAR;
502 chan->td = CPDMA_RXTEARDOWN;
503 chan->dir = DMA_FROM_DEVICE;
504 } else {
505 chan->hdp = ctlr->params.txhdp + offset;
506 chan->cp = ctlr->params.txcp + offset;
507 chan->int_set = CPDMA_TXINTMASKSET;
508 chan->int_clear = CPDMA_TXINTMASKCLEAR;
509 chan->td = CPDMA_TXTEARDOWN;
510 chan->dir = DMA_TO_DEVICE;
511 }
512 chan->mask = BIT(chan_linear(chan));
513
514 spin_lock_init(&chan->lock);
515
516 ctlr->channels[chan_num] = chan;
517 spin_unlock_irqrestore(&ctlr->lock, flags);
518 return chan;
519
520 err_chan_busy:
521 spin_unlock_irqrestore(&ctlr->lock, flags);
522 kfree(chan);
523 err_chan_alloc:
524 return ERR_PTR(ret);
525 }
526
527 int cpdma_chan_destroy(struct cpdma_chan *chan)
528 {
529 struct cpdma_ctlr *ctlr = chan->ctlr;
530 unsigned long flags;
531
532 if (!chan)
533 return -EINVAL;
534
535 spin_lock_irqsave(&ctlr->lock, flags);
536 if (chan->state != CPDMA_STATE_IDLE)
537 cpdma_chan_stop(chan);
538 ctlr->channels[chan->chan_num] = NULL;
539 spin_unlock_irqrestore(&ctlr->lock, flags);
540 kfree(chan);
541 return 0;
542 }
543
544 int cpdma_chan_get_stats(struct cpdma_chan *chan,
545 struct cpdma_chan_stats *stats)
546 {
547 unsigned long flags;
548 if (!chan)
549 return -EINVAL;
550 spin_lock_irqsave(&chan->lock, flags);
551 memcpy(stats, &chan->stats, sizeof(*stats));
552 spin_unlock_irqrestore(&chan->lock, flags);
553 return 0;
554 }
555
556 int cpdma_chan_dump(struct cpdma_chan *chan)
557 {
558 unsigned long flags;
559 struct device *dev = chan->ctlr->dev;
560
561 spin_lock_irqsave(&chan->lock, flags);
562
563 dev_info(dev, "channel %d (%s %d) state %s",
564 chan->chan_num, is_rx_chan(chan) ? "rx" : "tx",
565 chan_linear(chan), cpdma_state_str[chan->state]);
566 dev_info(dev, "\thdp: %x\n", chan_read(chan, hdp));
567 dev_info(dev, "\tcp: %x\n", chan_read(chan, cp));
568 if (chan->rxfree) {
569 dev_info(dev, "\trxfree: %x\n",
570 chan_read(chan, rxfree));
571 }
572
573 dev_info(dev, "\tstats head_enqueue: %d\n",
574 chan->stats.head_enqueue);
575 dev_info(dev, "\tstats tail_enqueue: %d\n",
576 chan->stats.tail_enqueue);
577 dev_info(dev, "\tstats pad_enqueue: %d\n",
578 chan->stats.pad_enqueue);
579 dev_info(dev, "\tstats misqueued: %d\n",
580 chan->stats.misqueued);
581 dev_info(dev, "\tstats desc_alloc_fail: %d\n",
582 chan->stats.desc_alloc_fail);
583 dev_info(dev, "\tstats pad_alloc_fail: %d\n",
584 chan->stats.pad_alloc_fail);
585 dev_info(dev, "\tstats runt_receive_buff: %d\n",
586 chan->stats.runt_receive_buff);
587 dev_info(dev, "\tstats runt_transmit_buff: %d\n",
588 chan->stats.runt_transmit_buff);
589 dev_info(dev, "\tstats empty_dequeue: %d\n",
590 chan->stats.empty_dequeue);
591 dev_info(dev, "\tstats busy_dequeue: %d\n",
592 chan->stats.busy_dequeue);
593 dev_info(dev, "\tstats good_dequeue: %d\n",
594 chan->stats.good_dequeue);
595 dev_info(dev, "\tstats requeue: %d\n",
596 chan->stats.requeue);
597 dev_info(dev, "\tstats teardown_dequeue: %d\n",
598 chan->stats.teardown_dequeue);
599
600 spin_unlock_irqrestore(&chan->lock, flags);
601 return 0;
602 }
603
604 static void __cpdma_chan_submit(struct cpdma_chan *chan,
605 struct cpdma_desc __iomem *desc)
606 {
607 struct cpdma_ctlr *ctlr = chan->ctlr;
608 struct cpdma_desc __iomem *prev = chan->tail;
609 struct cpdma_desc_pool *pool = ctlr->pool;
610 dma_addr_t desc_dma;
611 u32 mode;
612
613 desc_dma = desc_phys(pool, desc);
614
615 /* simple case - idle channel */
616 if (!chan->head) {
617 chan->stats.head_enqueue++;
618 chan->head = desc;
619 chan->tail = desc;
620 if (chan->state == CPDMA_STATE_ACTIVE)
621 chan_write(chan, hdp, desc_dma);
622 return;
623 }
624
625 /* first chain the descriptor at the tail of the list */
626 desc_write(prev, hw_next, desc_dma);
627 chan->tail = desc;
628 chan->stats.tail_enqueue++;
629
630 /* next check if EOQ has been triggered already */
631 mode = desc_read(prev, hw_mode);
632 if (((mode & (CPDMA_DESC_EOQ | CPDMA_DESC_OWNER)) == CPDMA_DESC_EOQ) &&
633 (chan->state == CPDMA_STATE_ACTIVE)) {
634 desc_write(prev, hw_mode, mode & ~CPDMA_DESC_EOQ);
635 chan_write(chan, hdp, desc_dma);
636 chan->stats.misqueued++;
637 }
638 }
639
640 int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
641 int len, gfp_t gfp_mask)
642 {
643 struct cpdma_ctlr *ctlr = chan->ctlr;
644 struct cpdma_desc __iomem *desc;
645 dma_addr_t buffer;
646 unsigned long flags;
647 u32 mode;
648 int ret = 0;
649
650 spin_lock_irqsave(&chan->lock, flags);
651
652 if (chan->state == CPDMA_STATE_TEARDOWN) {
653 ret = -EINVAL;
654 goto unlock_ret;
655 }
656
657 desc = cpdma_desc_alloc(ctlr->pool, 1);
658 if (!desc) {
659 chan->stats.desc_alloc_fail++;
660 ret = -ENOMEM;
661 goto unlock_ret;
662 }
663
664 if (len < ctlr->params.min_packet_size) {
665 len = ctlr->params.min_packet_size;
666 chan->stats.runt_transmit_buff++;
667 }
668
669 buffer = dma_map_single(ctlr->dev, data, len, chan->dir);
670 mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
671
672 desc_write(desc, hw_next, 0);
673 desc_write(desc, hw_buffer, buffer);
674 desc_write(desc, hw_len, len);
675 desc_write(desc, hw_mode, mode | len);
676 desc_write(desc, sw_token, token);
677 desc_write(desc, sw_buffer, buffer);
678 desc_write(desc, sw_len, len);
679
680 __cpdma_chan_submit(chan, desc);
681
682 if (chan->state == CPDMA_STATE_ACTIVE && chan->rxfree)
683 chan_write(chan, rxfree, 1);
684
685 chan->count++;
686
687 unlock_ret:
688 spin_unlock_irqrestore(&chan->lock, flags);
689 return ret;
690 }
691
692 static void __cpdma_chan_free(struct cpdma_chan *chan,
693 struct cpdma_desc __iomem *desc,
694 int outlen, int status)
695 {
696 struct cpdma_ctlr *ctlr = chan->ctlr;
697 struct cpdma_desc_pool *pool = ctlr->pool;
698 dma_addr_t buff_dma;
699 int origlen;
700 void *token;
701
702 token = (void *)desc_read(desc, sw_token);
703 buff_dma = desc_read(desc, sw_buffer);
704 origlen = desc_read(desc, sw_len);
705
706 dma_unmap_single(ctlr->dev, buff_dma, origlen, chan->dir);
707 cpdma_desc_free(pool, desc, 1);
708 (*chan->handler)(token, outlen, status);
709 }
710
711 static int __cpdma_chan_process(struct cpdma_chan *chan)
712 {
713 struct cpdma_ctlr *ctlr = chan->ctlr;
714 struct cpdma_desc __iomem *desc;
715 int status, outlen;
716 struct cpdma_desc_pool *pool = ctlr->pool;
717 dma_addr_t desc_dma;
718 unsigned long flags;
719
720 spin_lock_irqsave(&chan->lock, flags);
721
722 desc = chan->head;
723 if (!desc) {
724 chan->stats.empty_dequeue++;
725 status = -ENOENT;
726 goto unlock_ret;
727 }
728 desc_dma = desc_phys(pool, desc);
729
730 status = __raw_readl(&desc->hw_mode);
731 outlen = status & 0x7ff;
732 if (status & CPDMA_DESC_OWNER) {
733 chan->stats.busy_dequeue++;
734 status = -EBUSY;
735 goto unlock_ret;
736 }
737 status = status & (CPDMA_DESC_EOQ | CPDMA_DESC_TD_COMPLETE);
738
739 chan->head = desc_from_phys(pool, desc_read(desc, hw_next));
740 chan_write(chan, cp, desc_dma);
741 chan->count--;
742 chan->stats.good_dequeue++;
743
744 if (status & CPDMA_DESC_EOQ) {
745 chan->stats.requeue++;
746 chan_write(chan, hdp, desc_phys(pool, chan->head));
747 }
748
749 spin_unlock_irqrestore(&chan->lock, flags);
750
751 __cpdma_chan_free(chan, desc, outlen, status);
752 return status;
753
754 unlock_ret:
755 spin_unlock_irqrestore(&chan->lock, flags);
756 return status;
757 }
758
759 int cpdma_chan_process(struct cpdma_chan *chan, int quota)
760 {
761 int used = 0, ret = 0;
762
763 if (chan->state != CPDMA_STATE_ACTIVE)
764 return -EINVAL;
765
766 while (used < quota) {
767 ret = __cpdma_chan_process(chan);
768 if (ret < 0)
769 break;
770 used++;
771 }
772 return used;
773 }
774
775 int cpdma_chan_start(struct cpdma_chan *chan)
776 {
777 struct cpdma_ctlr *ctlr = chan->ctlr;
778 struct cpdma_desc_pool *pool = ctlr->pool;
779 unsigned long flags;
780
781 spin_lock_irqsave(&chan->lock, flags);
782 if (chan->state != CPDMA_STATE_IDLE) {
783 spin_unlock_irqrestore(&chan->lock, flags);
784 return -EBUSY;
785 }
786 if (ctlr->state != CPDMA_STATE_ACTIVE) {
787 spin_unlock_irqrestore(&chan->lock, flags);
788 return -EINVAL;
789 }
790 dma_reg_write(ctlr, chan->int_set, chan->mask);
791 chan->state = CPDMA_STATE_ACTIVE;
792 if (chan->head) {
793 chan_write(chan, hdp, desc_phys(pool, chan->head));
794 if (chan->rxfree)
795 chan_write(chan, rxfree, chan->count);
796 }
797
798 spin_unlock_irqrestore(&chan->lock, flags);
799 return 0;
800 }
801
802 int cpdma_chan_stop(struct cpdma_chan *chan)
803 {
804 struct cpdma_ctlr *ctlr = chan->ctlr;
805 struct cpdma_desc_pool *pool = ctlr->pool;
806 unsigned long flags;
807 int ret;
808 unsigned long timeout;
809
810 spin_lock_irqsave(&chan->lock, flags);
811 if (chan->state != CPDMA_STATE_ACTIVE) {
812 spin_unlock_irqrestore(&chan->lock, flags);
813 return -EINVAL;
814 }
815
816 chan->state = CPDMA_STATE_TEARDOWN;
817 dma_reg_write(ctlr, chan->int_clear, chan->mask);
818
819 /* trigger teardown */
820 dma_reg_write(ctlr, chan->td, chan->chan_num);
821
822 /* wait for teardown complete */
823 timeout = jiffies + HZ/10; /* 100 msec */
824 while (time_before(jiffies, timeout)) {
825 u32 cp = chan_read(chan, cp);
826 if ((cp & CPDMA_TEARDOWN_VALUE) == CPDMA_TEARDOWN_VALUE)
827 break;
828 cpu_relax();
829 }
830 WARN_ON(!time_before(jiffies, timeout));
831 chan_write(chan, cp, CPDMA_TEARDOWN_VALUE);
832
833 /* handle completed packets */
834 do {
835 ret = __cpdma_chan_process(chan);
836 if (ret < 0)
837 break;
838 } while ((ret & CPDMA_DESC_TD_COMPLETE) == 0);
839
840 /* remaining packets haven't been tx/rx'ed, clean them up */
841 while (chan->head) {
842 struct cpdma_desc __iomem *desc = chan->head;
843 dma_addr_t next_dma;
844
845 next_dma = desc_read(desc, hw_next);
846 chan->head = desc_from_phys(pool, next_dma);
847 chan->stats.teardown_dequeue++;
848
849 /* issue callback without locks held */
850 spin_unlock_irqrestore(&chan->lock, flags);
851 __cpdma_chan_free(chan, desc, 0, -ENOSYS);
852 spin_lock_irqsave(&chan->lock, flags);
853 }
854
855 chan->state = CPDMA_STATE_IDLE;
856 spin_unlock_irqrestore(&chan->lock, flags);
857 return 0;
858 }
859
860 int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable)
861 {
862 unsigned long flags;
863
864 spin_lock_irqsave(&chan->lock, flags);
865 if (chan->state != CPDMA_STATE_ACTIVE) {
866 spin_unlock_irqrestore(&chan->lock, flags);
867 return -EINVAL;
868 }
869
870 dma_reg_write(chan->ctlr, enable ? chan->int_set : chan->int_clear,
871 chan->mask);
872 spin_unlock_irqrestore(&chan->lock, flags);
873
874 return 0;
875 }
876
877 struct cpdma_control_info {
878 u32 reg;
879 u32 shift, mask;
880 int access;
881 #define ACCESS_RO BIT(0)
882 #define ACCESS_WO BIT(1)
883 #define ACCESS_RW (ACCESS_RO | ACCESS_WO)
884 };
885
886 struct cpdma_control_info controls[] = {
887 [CPDMA_CMD_IDLE] = {CPDMA_DMACONTROL, 3, 1, ACCESS_WO},
888 [CPDMA_COPY_ERROR_FRAMES] = {CPDMA_DMACONTROL, 4, 1, ACCESS_RW},
889 [CPDMA_RX_OFF_LEN_UPDATE] = {CPDMA_DMACONTROL, 2, 1, ACCESS_RW},
890 [CPDMA_RX_OWNERSHIP_FLIP] = {CPDMA_DMACONTROL, 1, 1, ACCESS_RW},
891 [CPDMA_TX_PRIO_FIXED] = {CPDMA_DMACONTROL, 0, 1, ACCESS_RW},
892 [CPDMA_STAT_IDLE] = {CPDMA_DMASTATUS, 31, 1, ACCESS_RO},
893 [CPDMA_STAT_TX_ERR_CODE] = {CPDMA_DMASTATUS, 20, 0xf, ACCESS_RW},
894 [CPDMA_STAT_TX_ERR_CHAN] = {CPDMA_DMASTATUS, 16, 0x7, ACCESS_RW},
895 [CPDMA_STAT_RX_ERR_CODE] = {CPDMA_DMASTATUS, 12, 0xf, ACCESS_RW},
896 [CPDMA_STAT_RX_ERR_CHAN] = {CPDMA_DMASTATUS, 8, 0x7, ACCESS_RW},
897 [CPDMA_RX_BUFFER_OFFSET] = {CPDMA_RXBUFFOFS, 0, 0xffff, ACCESS_RW},
898 };
899
900 int cpdma_control_get(struct cpdma_ctlr *ctlr, int control)
901 {
902 unsigned long flags;
903 struct cpdma_control_info *info = &controls[control];
904 int ret;
905
906 spin_lock_irqsave(&ctlr->lock, flags);
907
908 ret = -ENOTSUPP;
909 if (!ctlr->params.has_ext_regs)
910 goto unlock_ret;
911
912 ret = -EINVAL;
913 if (ctlr->state != CPDMA_STATE_ACTIVE)
914 goto unlock_ret;
915
916 ret = -ENOENT;
917 if (control < 0 || control >= ARRAY_SIZE(controls))
918 goto unlock_ret;
919
920 ret = -EPERM;
921 if ((info->access & ACCESS_RO) != ACCESS_RO)
922 goto unlock_ret;
923
924 ret = (dma_reg_read(ctlr, info->reg) >> info->shift) & info->mask;
925
926 unlock_ret:
927 spin_unlock_irqrestore(&ctlr->lock, flags);
928 return ret;
929 }
930
931 int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value)
932 {
933 unsigned long flags;
934 struct cpdma_control_info *info = &controls[control];
935 int ret;
936 u32 val;
937
938 spin_lock_irqsave(&ctlr->lock, flags);
939
940 ret = -ENOTSUPP;
941 if (!ctlr->params.has_ext_regs)
942 goto unlock_ret;
943
944 ret = -EINVAL;
945 if (ctlr->state != CPDMA_STATE_ACTIVE)
946 goto unlock_ret;
947
948 ret = -ENOENT;
949 if (control < 0 || control >= ARRAY_SIZE(controls))
950 goto unlock_ret;
951
952 ret = -EPERM;
953 if ((info->access & ACCESS_WO) != ACCESS_WO)
954 goto unlock_ret;
955
956 val = dma_reg_read(ctlr, info->reg);
957 val &= ~(info->mask << info->shift);
958 val |= (value & info->mask) << info->shift;
959 dma_reg_write(ctlr, info->reg, val);
960 ret = 0;
961
962 unlock_ret:
963 spin_unlock_irqrestore(&ctlr->lock, flags);
964 return ret;
965 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree