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drivers: net: davinci_cpdma: double free on error
[deliverable/linux.git] / drivers / net / ethernet / ti / davinci_cpdma.c
CommitLineData
ef8c2dab
CC		 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>
76fbc247 18#include <linux/module.h>
ef8c2dab
CC		 19#include <linux/slab.h>
20#include <linux/err.h>
21#include <linux/dma-mapping.h>
22#include <linux/io.h>
817f6d1a 23#include <linux/delay.h>
ef8c2dab
CC		 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)
f6e135c8
M		 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))
28a19fe6 67#define CPDMA_DESC_CRC_LEN 4
ef8c2dab
CC		 68
69#define CPDMA_TEARDOWN_VALUE 0xfffffffc
70
71struct 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
83struct cpdma_desc_pool {
c767db51 84 phys_addr_t phys;
6a1fef6d 85 u32 hw_addr;
ef8c2dab
CC		 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
95enum cpdma_state {
96 CPDMA_STATE_IDLE,
97 CPDMA_STATE_ACTIVE,
98 CPDMA_STATE_TEARDOWN,
99};
100
32a6d90b 101static const char *cpdma_state_str[] = { "idle", "active", "teardown" };
ef8c2dab
CC		 102
103struct 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
112struct cpdma_chan {
fae50823
M		 113 struct cpdma_desc __iomem *head, *tail;
114 void __iomem *hdp, *cp, *rxfree;
ef8c2dab
CC		 115 enum cpdma_state state;
116 struct cpdma_ctlr *ctlr;
117 int chan_num;
118 spinlock_t lock;
ef8c2dab 119 int count;
ef8c2dab
CC		 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
f6e135c8
M		 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
ef8c2dab
CC		 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 */
154static struct cpdma_desc_pool *
6a1fef6d
S		 155cpdma_desc_pool_create(struct device *dev, u32 phys, u32 hw_addr,
156 int size, int align)
ef8c2dab
CC		 157{
158 int bitmap_size;
159 struct cpdma_desc_pool *pool;
160
e1943128 161 pool = devm_kzalloc(dev, sizeof(*pool), GFP_KERNEL);
ef8c2dab 162 if (!pool)
e1943128 163 goto fail;
ef8c2dab
CC		 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);
e1943128 173 pool->bitmap = devm_kzalloc(dev, bitmap_size, GFP_KERNEL);
ef8c2dab
CC		 174 if (!pool->bitmap)
175 goto fail;
176
177 if (phys) {
178 pool->phys = phys;
179 pool->iomap = ioremap(phys, size);
6a1fef6d 180 pool->hw_addr = hw_addr;
ef8c2dab
CC		 181 } else {
182 pool->cpumap = dma_alloc_coherent(dev, size, &pool->phys,
183 GFP_KERNEL);
43d620c8 184 pool->iomap = pool->cpumap;
6a1fef6d 185 pool->hw_addr = pool->phys;
ef8c2dab
CC		 186 }
187
188 if (pool->iomap)
189 return pool;
ef8c2dab 190fail:
ef8c2dab
CC		 191 return NULL;
192}
193
194static void cpdma_desc_pool_destroy(struct cpdma_desc_pool *pool)
195{
196 unsigned long flags;
197
198 if (!pool)
199 return;
200
201 spin_lock_irqsave(&pool->lock, flags);
202 WARN_ON(pool->used_desc);
ef8c2dab
CC		 203 if (pool->cpumap) {
204 dma_free_coherent(pool->dev, pool->mem_size, pool->cpumap,
205 pool->phys);
206 } else {
207 iounmap(pool->iomap);
208 }
209 spin_unlock_irqrestore(&pool->lock, flags);
ef8c2dab
CC		 210}
211
212static inline dma_addr_t desc_phys(struct cpdma_desc_pool *pool,
213 struct cpdma_desc __iomem *desc)
214{
215 if (!desc)
216 return 0;
c767db51 217 return pool->hw_addr + (__force long)desc - (__force long)pool->iomap;
ef8c2dab
CC		 218}
219
220static inline struct cpdma_desc __iomem *
221desc_from_phys(struct cpdma_desc_pool *pool, dma_addr_t dma)
222{
6a1fef6d 223 return dma ? pool->iomap + dma - pool->hw_addr : NULL;
ef8c2dab
CC		 224}
225
226static struct cpdma_desc __iomem *
fae50823 227cpdma_desc_alloc(struct cpdma_desc_pool *pool, int num_desc, bool is_rx)
ef8c2dab
CC		 228{
229 unsigned long flags;
230 int index;
fae50823
M		 231 int desc_start;
232 int desc_end;
ef8c2dab
CC		 233 struct cpdma_desc __iomem *desc = NULL;
234
235 spin_lock_irqsave(&pool->lock, flags);
236
fae50823
M		 237 if (is_rx) {
238 desc_start = 0;
239 desc_end = pool->num_desc/2;
240 } else {
241 desc_start = pool->num_desc/2;
242 desc_end = pool->num_desc;
243 }
244
245 index = bitmap_find_next_zero_area(pool->bitmap,
246 desc_end, desc_start, num_desc, 0);
247 if (index < desc_end) {
ef8c2dab
CC		 248 bitmap_set(pool->bitmap, index, num_desc);
249 desc = pool->iomap + pool->desc_size * index;
250 pool->used_desc++;
251 }
252
253 spin_unlock_irqrestore(&pool->lock, flags);
254 return desc;
255}
256
257static void cpdma_desc_free(struct cpdma_desc_pool *pool,
258 struct cpdma_desc __iomem *desc, int num_desc)
259{
260 unsigned long flags, index;
261
262 index = ((unsigned long)desc - (unsigned long)pool->iomap) /
263 pool->desc_size;
264 spin_lock_irqsave(&pool->lock, flags);
265 bitmap_clear(pool->bitmap, index, num_desc);
266 pool->used_desc--;
267 spin_unlock_irqrestore(&pool->lock, flags);
268}
269
270struct cpdma_ctlr *cpdma_ctlr_create(struct cpdma_params *params)
271{
272 struct cpdma_ctlr *ctlr;
273
e1943128 274 ctlr = devm_kzalloc(params->dev, sizeof(*ctlr), GFP_KERNEL);
ef8c2dab
CC		 275 if (!ctlr)
276 return NULL;
277
278 ctlr->state = CPDMA_STATE_IDLE;
279 ctlr->params = *params;
280 ctlr->dev = params->dev;
281 spin_lock_init(&ctlr->lock);
282
283 ctlr->pool = cpdma_desc_pool_create(ctlr->dev,
284 ctlr->params.desc_mem_phys,
6a1fef6d 285 ctlr->params.desc_hw_addr,
ef8c2dab
CC		 286 ctlr->params.desc_mem_size,
287 ctlr->params.desc_align);
2f87208e 288 if (!ctlr->pool)
ef8c2dab 289 return NULL;
ef8c2dab
CC		 290
291 if (WARN_ON(ctlr->num_chan > CPDMA_MAX_CHANNELS))
292 ctlr->num_chan = CPDMA_MAX_CHANNELS;
293 return ctlr;
294}
32a6d90b 295EXPORT_SYMBOL_GPL(cpdma_ctlr_create);
ef8c2dab
CC		 296
297int cpdma_ctlr_start(struct cpdma_ctlr *ctlr)
298{
299 unsigned long flags;
300 int i;
301
302 spin_lock_irqsave(&ctlr->lock, flags);
303 if (ctlr->state != CPDMA_STATE_IDLE) {
304 spin_unlock_irqrestore(&ctlr->lock, flags);
305 return -EBUSY;
306 }
307
308 if (ctlr->params.has_soft_reset) {
817f6d1a 309 unsigned timeout = 10 * 100;
ef8c2dab
CC		 310
311 dma_reg_write(ctlr, CPDMA_SOFTRESET, 1);
817f6d1a 312 while (timeout) {
ef8c2dab
CC		 313 if (dma_reg_read(ctlr, CPDMA_SOFTRESET) == 0)
314 break;
817f6d1a
SS		 315 udelay(10);
316 timeout--;
ef8c2dab 317 }
817f6d1a 318 WARN_ON(!timeout);
ef8c2dab
CC		 319 }
320
321 for (i = 0; i < ctlr->num_chan; i++) {
322 __raw_writel(0, ctlr->params.txhdp + 4 * i);
323 __raw_writel(0, ctlr->params.rxhdp + 4 * i);
324 __raw_writel(0, ctlr->params.txcp + 4 * i);
325 __raw_writel(0, ctlr->params.rxcp + 4 * i);
326 }
327
328 dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
329 dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
330
331 dma_reg_write(ctlr, CPDMA_TXCONTROL, 1);
332 dma_reg_write(ctlr, CPDMA_RXCONTROL, 1);
333
334 ctlr->state = CPDMA_STATE_ACTIVE;
335
336 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
337 if (ctlr->channels[i])
338 cpdma_chan_start(ctlr->channels[i]);
339 }
340 spin_unlock_irqrestore(&ctlr->lock, flags);
341 return 0;
342}
32a6d90b 343EXPORT_SYMBOL_GPL(cpdma_ctlr_start);
ef8c2dab
CC		 344
345int cpdma_ctlr_stop(struct cpdma_ctlr *ctlr)
346{
347 unsigned long flags;
348 int i;
349
350 spin_lock_irqsave(&ctlr->lock, flags);
cd11cf50 351 if (ctlr->state == CPDMA_STATE_TEARDOWN) {
ef8c2dab
CC		 352 spin_unlock_irqrestore(&ctlr->lock, flags);
353 return -EINVAL;
354 }
355
356 ctlr->state = CPDMA_STATE_TEARDOWN;
357
358 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
359 if (ctlr->channels[i])
360 cpdma_chan_stop(ctlr->channels[i]);
361 }
362
363 dma_reg_write(ctlr, CPDMA_RXINTMASKCLEAR, 0xffffffff);
364 dma_reg_write(ctlr, CPDMA_TXINTMASKCLEAR, 0xffffffff);
365
366 dma_reg_write(ctlr, CPDMA_TXCONTROL, 0);
367 dma_reg_write(ctlr, CPDMA_RXCONTROL, 0);
368
369 ctlr->state = CPDMA_STATE_IDLE;
370
371 spin_unlock_irqrestore(&ctlr->lock, flags);
372 return 0;
373}
32a6d90b 374EXPORT_SYMBOL_GPL(cpdma_ctlr_stop);
ef8c2dab
CC		 375
376int cpdma_ctlr_dump(struct cpdma_ctlr *ctlr)
377{
378 struct device *dev = ctlr->dev;
379 unsigned long flags;
380 int i;
381
382 spin_lock_irqsave(&ctlr->lock, flags);
383
384 dev_info(dev, "CPDMA: state: %s", cpdma_state_str[ctlr->state]);
385
386 dev_info(dev, "CPDMA: txidver: %x",
387 dma_reg_read(ctlr, CPDMA_TXIDVER));
388 dev_info(dev, "CPDMA: txcontrol: %x",
389 dma_reg_read(ctlr, CPDMA_TXCONTROL));
390 dev_info(dev, "CPDMA: txteardown: %x",
391 dma_reg_read(ctlr, CPDMA_TXTEARDOWN));
392 dev_info(dev, "CPDMA: rxidver: %x",
393 dma_reg_read(ctlr, CPDMA_RXIDVER));
394 dev_info(dev, "CPDMA: rxcontrol: %x",
395 dma_reg_read(ctlr, CPDMA_RXCONTROL));
396 dev_info(dev, "CPDMA: softreset: %x",
397 dma_reg_read(ctlr, CPDMA_SOFTRESET));
398 dev_info(dev, "CPDMA: rxteardown: %x",
399 dma_reg_read(ctlr, CPDMA_RXTEARDOWN));
400 dev_info(dev, "CPDMA: txintstatraw: %x",
401 dma_reg_read(ctlr, CPDMA_TXINTSTATRAW));
402 dev_info(dev, "CPDMA: txintstatmasked: %x",
403 dma_reg_read(ctlr, CPDMA_TXINTSTATMASKED));
404 dev_info(dev, "CPDMA: txintmaskset: %x",
405 dma_reg_read(ctlr, CPDMA_TXINTMASKSET));
406 dev_info(dev, "CPDMA: txintmaskclear: %x",
407 dma_reg_read(ctlr, CPDMA_TXINTMASKCLEAR));
408 dev_info(dev, "CPDMA: macinvector: %x",
409 dma_reg_read(ctlr, CPDMA_MACINVECTOR));
410 dev_info(dev, "CPDMA: maceoivector: %x",
411 dma_reg_read(ctlr, CPDMA_MACEOIVECTOR));
412 dev_info(dev, "CPDMA: rxintstatraw: %x",
413 dma_reg_read(ctlr, CPDMA_RXINTSTATRAW));
414 dev_info(dev, "CPDMA: rxintstatmasked: %x",
415 dma_reg_read(ctlr, CPDMA_RXINTSTATMASKED));
416 dev_info(dev, "CPDMA: rxintmaskset: %x",
417 dma_reg_read(ctlr, CPDMA_RXINTMASKSET));
418 dev_info(dev, "CPDMA: rxintmaskclear: %x",
419 dma_reg_read(ctlr, CPDMA_RXINTMASKCLEAR));
420 dev_info(dev, "CPDMA: dmaintstatraw: %x",
421 dma_reg_read(ctlr, CPDMA_DMAINTSTATRAW));
422 dev_info(dev, "CPDMA: dmaintstatmasked: %x",
423 dma_reg_read(ctlr, CPDMA_DMAINTSTATMASKED));
424 dev_info(dev, "CPDMA: dmaintmaskset: %x",
425 dma_reg_read(ctlr, CPDMA_DMAINTMASKSET));
426 dev_info(dev, "CPDMA: dmaintmaskclear: %x",
427 dma_reg_read(ctlr, CPDMA_DMAINTMASKCLEAR));
428
429 if (!ctlr->params.has_ext_regs) {
430 dev_info(dev, "CPDMA: dmacontrol: %x",
431 dma_reg_read(ctlr, CPDMA_DMACONTROL));
432 dev_info(dev, "CPDMA: dmastatus: %x",
433 dma_reg_read(ctlr, CPDMA_DMASTATUS));
434 dev_info(dev, "CPDMA: rxbuffofs: %x",
435 dma_reg_read(ctlr, CPDMA_RXBUFFOFS));
436 }
437
438 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++)
439 if (ctlr->channels[i])
440 cpdma_chan_dump(ctlr->channels[i]);
441
442 spin_unlock_irqrestore(&ctlr->lock, flags);
443 return 0;
444}
32a6d90b 445EXPORT_SYMBOL_GPL(cpdma_ctlr_dump);
ef8c2dab
CC		 446
447int cpdma_ctlr_destroy(struct cpdma_ctlr *ctlr)
448{
449 unsigned long flags;
450 int ret = 0, i;
451
452 if (!ctlr)
453 return -EINVAL;
454
455 spin_lock_irqsave(&ctlr->lock, flags);
456 if (ctlr->state != CPDMA_STATE_IDLE)
457 cpdma_ctlr_stop(ctlr);
458
79876e03
CR		 459 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++)
460 cpdma_chan_destroy(ctlr->channels[i]);
ef8c2dab
CC		 461
462 cpdma_desc_pool_destroy(ctlr->pool);
463 spin_unlock_irqrestore(&ctlr->lock, flags);
ef8c2dab
CC		 464 return ret;
465}
32a6d90b 466EXPORT_SYMBOL_GPL(cpdma_ctlr_destroy);
ef8c2dab
CC		 467
468int cpdma_ctlr_int_ctrl(struct cpdma_ctlr *ctlr, bool enable)
469{
470 unsigned long flags;
471 int i, reg;
472
473 spin_lock_irqsave(&ctlr->lock, flags);
474 if (ctlr->state != CPDMA_STATE_ACTIVE) {
475 spin_unlock_irqrestore(&ctlr->lock, flags);
476 return -EINVAL;
477 }
478
479 reg = enable ? CPDMA_DMAINTMASKSET : CPDMA_DMAINTMASKCLEAR;
480 dma_reg_write(ctlr, reg, CPDMA_DMAINT_HOSTERR);
481
482 for (i = 0; i < ARRAY_SIZE(ctlr->channels); i++) {
483 if (ctlr->channels[i])
484 cpdma_chan_int_ctrl(ctlr->channels[i], enable);
485 }
486
487 spin_unlock_irqrestore(&ctlr->lock, flags);
488 return 0;
489}
6929e24e 490EXPORT_SYMBOL_GPL(cpdma_ctlr_int_ctrl);
ef8c2dab 491
510a1e72 492void cpdma_ctlr_eoi(struct cpdma_ctlr *ctlr, u32 value)
ef8c2dab 493{
510a1e72 494 dma_reg_write(ctlr, CPDMA_MACEOIVECTOR, value);
ef8c2dab 495}
6929e24e 496EXPORT_SYMBOL_GPL(cpdma_ctlr_eoi);
ef8c2dab
CC		 497
498struct cpdma_chan *cpdma_chan_create(struct cpdma_ctlr *ctlr, int chan_num,
499 cpdma_handler_fn handler)
500{
501 struct cpdma_chan *chan;
e1943128 502 int offset = (chan_num % CPDMA_MAX_CHANNELS) * 4;
ef8c2dab
CC		 503 unsigned long flags;
504
505 if (__chan_linear(chan_num) >= ctlr->num_chan)
506 return NULL;
507
e1943128 508 chan = devm_kzalloc(ctlr->dev, sizeof(*chan), GFP_KERNEL);
ef8c2dab 509 if (!chan)
e1943128 510 return ERR_PTR(-ENOMEM);
ef8c2dab
CC		 511
512 spin_lock_irqsave(&ctlr->lock, flags);
e1943128
GC		 513 if (ctlr->channels[chan_num]) {
514 spin_unlock_irqrestore(&ctlr->lock, flags);
515 devm_kfree(ctlr->dev, chan);
516 return ERR_PTR(-EBUSY);
517 }
ef8c2dab
CC		 518
519 chan->ctlr = ctlr;
520 chan->state = CPDMA_STATE_IDLE;
521 chan->chan_num = chan_num;
522 chan->handler = handler;
523
524 if (is_rx_chan(chan)) {
525 chan->hdp = ctlr->params.rxhdp + offset;
526 chan->cp = ctlr->params.rxcp + offset;
527 chan->rxfree = ctlr->params.rxfree + offset;
528 chan->int_set = CPDMA_RXINTMASKSET;
529 chan->int_clear = CPDMA_RXINTMASKCLEAR;
530 chan->td = CPDMA_RXTEARDOWN;
531 chan->dir = DMA_FROM_DEVICE;
532 } else {
533 chan->hdp = ctlr->params.txhdp + offset;
534 chan->cp = ctlr->params.txcp + offset;
535 chan->int_set = CPDMA_TXINTMASKSET;
536 chan->int_clear = CPDMA_TXINTMASKCLEAR;
537 chan->td = CPDMA_TXTEARDOWN;
538 chan->dir = DMA_TO_DEVICE;
539 }
540 chan->mask = BIT(chan_linear(chan));
541
542 spin_lock_init(&chan->lock);
543
544 ctlr->channels[chan_num] = chan;
545 spin_unlock_irqrestore(&ctlr->lock, flags);
546 return chan;
ef8c2dab 547}
32a6d90b 548EXPORT_SYMBOL_GPL(cpdma_chan_create);
ef8c2dab
CC		 549
550int cpdma_chan_destroy(struct cpdma_chan *chan)
551{
f37c54b6 552 struct cpdma_ctlr *ctlr;
ef8c2dab
CC		 553 unsigned long flags;
554
555 if (!chan)
556 return -EINVAL;
f37c54b6 557 ctlr = chan->ctlr;
ef8c2dab
CC		 558
559 spin_lock_irqsave(&ctlr->lock, flags);
560 if (chan->state != CPDMA_STATE_IDLE)
561 cpdma_chan_stop(chan);
562 ctlr->channels[chan->chan_num] = NULL;
563 spin_unlock_irqrestore(&ctlr->lock, flags);
564 kfree(chan);
565 return 0;
566}
32a6d90b 567EXPORT_SYMBOL_GPL(cpdma_chan_destroy);
ef8c2dab
CC		 568
569int cpdma_chan_get_stats(struct cpdma_chan *chan,
570 struct cpdma_chan_stats *stats)
571{
572 unsigned long flags;
573 if (!chan)
574 return -EINVAL;
575 spin_lock_irqsave(&chan->lock, flags);
576 memcpy(stats, &chan->stats, sizeof(*stats));
577 spin_unlock_irqrestore(&chan->lock, flags);
578 return 0;
579}
0ca04b63 580EXPORT_SYMBOL_GPL(cpdma_chan_get_stats);
ef8c2dab
CC		 581
582int cpdma_chan_dump(struct cpdma_chan *chan)
583{
584 unsigned long flags;
585 struct device *dev = chan->ctlr->dev;
586
587 spin_lock_irqsave(&chan->lock, flags);
588
589 dev_info(dev, "channel %d (%s %d) state %s",
590 chan->chan_num, is_rx_chan(chan) ? "rx" : "tx",
591 chan_linear(chan), cpdma_state_str[chan->state]);
592 dev_info(dev, "\thdp: %x\n", chan_read(chan, hdp));
593 dev_info(dev, "\tcp: %x\n", chan_read(chan, cp));
594 if (chan->rxfree) {
595 dev_info(dev, "\trxfree: %x\n",
596 chan_read(chan, rxfree));
597 }
598
599 dev_info(dev, "\tstats head_enqueue: %d\n",
600 chan->stats.head_enqueue);
601 dev_info(dev, "\tstats tail_enqueue: %d\n",
602 chan->stats.tail_enqueue);
603 dev_info(dev, "\tstats pad_enqueue: %d\n",
604 chan->stats.pad_enqueue);
605 dev_info(dev, "\tstats misqueued: %d\n",
606 chan->stats.misqueued);
607 dev_info(dev, "\tstats desc_alloc_fail: %d\n",
608 chan->stats.desc_alloc_fail);
609 dev_info(dev, "\tstats pad_alloc_fail: %d\n",
610 chan->stats.pad_alloc_fail);
611 dev_info(dev, "\tstats runt_receive_buff: %d\n",
612 chan->stats.runt_receive_buff);
613 dev_info(dev, "\tstats runt_transmit_buff: %d\n",
614 chan->stats.runt_transmit_buff);
615 dev_info(dev, "\tstats empty_dequeue: %d\n",
616 chan->stats.empty_dequeue);
617 dev_info(dev, "\tstats busy_dequeue: %d\n",
618 chan->stats.busy_dequeue);
619 dev_info(dev, "\tstats good_dequeue: %d\n",
620 chan->stats.good_dequeue);
621 dev_info(dev, "\tstats requeue: %d\n",
622 chan->stats.requeue);
623 dev_info(dev, "\tstats teardown_dequeue: %d\n",
624 chan->stats.teardown_dequeue);
625
626 spin_unlock_irqrestore(&chan->lock, flags);
627 return 0;
628}
629
630static void __cpdma_chan_submit(struct cpdma_chan *chan,
631 struct cpdma_desc __iomem *desc)
632{
633 struct cpdma_ctlr *ctlr = chan->ctlr;
634 struct cpdma_desc __iomem *prev = chan->tail;
635 struct cpdma_desc_pool *pool = ctlr->pool;
636 dma_addr_t desc_dma;
637 u32 mode;
638
639 desc_dma = desc_phys(pool, desc);
640
641 /* simple case - idle channel */
642 if (!chan->head) {
643 chan->stats.head_enqueue++;
644 chan->head = desc;
645 chan->tail = desc;
646 if (chan->state == CPDMA_STATE_ACTIVE)
647 chan_write(chan, hdp, desc_dma);
648 return;
649 }
650
651 /* first chain the descriptor at the tail of the list */
652 desc_write(prev, hw_next, desc_dma);
653 chan->tail = desc;
654 chan->stats.tail_enqueue++;
655
656 /* next check if EOQ has been triggered already */
657 mode = desc_read(prev, hw_mode);
658 if (((mode & (CPDMA_DESC_EOQ | CPDMA_DESC_OWNER)) == CPDMA_DESC_EOQ) &&
659 (chan->state == CPDMA_STATE_ACTIVE)) {
660 desc_write(prev, hw_mode, mode & ~CPDMA_DESC_EOQ);
661 chan_write(chan, hdp, desc_dma);
662 chan->stats.misqueued++;
663 }
664}
665
666int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
aef614e1 667 int len, int directed)
ef8c2dab
CC		 668{
669 struct cpdma_ctlr *ctlr = chan->ctlr;
670 struct cpdma_desc __iomem *desc;
671 dma_addr_t buffer;
672 unsigned long flags;
673 u32 mode;
674 int ret = 0;
675
676 spin_lock_irqsave(&chan->lock, flags);
677
678 if (chan->state == CPDMA_STATE_TEARDOWN) {
679 ret = -EINVAL;
680 goto unlock_ret;
681 }
682
fae50823 683 desc = cpdma_desc_alloc(ctlr->pool, 1, is_rx_chan(chan));
ef8c2dab
CC		 684 if (!desc) {
685 chan->stats.desc_alloc_fail++;
686 ret = -ENOMEM;
687 goto unlock_ret;
688 }
689
690 if (len < ctlr->params.min_packet_size) {
691 len = ctlr->params.min_packet_size;
692 chan->stats.runt_transmit_buff++;
693 }
694
695 buffer = dma_map_single(ctlr->dev, data, len, chan->dir);
14bd0769
SS		 696 ret = dma_mapping_error(ctlr->dev, buffer);
697 if (ret) {
698 cpdma_desc_free(ctlr->pool, desc, 1);
699 ret = -EINVAL;
700 goto unlock_ret;
701 }
702
ef8c2dab 703 mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
f6e135c8 704 cpdma_desc_to_port(chan, mode, directed);
ef8c2dab
CC		 705
706 desc_write(desc, hw_next, 0);
707 desc_write(desc, hw_buffer, buffer);
708 desc_write(desc, hw_len, len);
709 desc_write(desc, hw_mode, mode | len);
710 desc_write(desc, sw_token, token);
711 desc_write(desc, sw_buffer, buffer);
712 desc_write(desc, sw_len, len);
713
714 __cpdma_chan_submit(chan, desc);
715
716 if (chan->state == CPDMA_STATE_ACTIVE && chan->rxfree)
717 chan_write(chan, rxfree, 1);
718
719 chan->count++;
720
721unlock_ret:
722 spin_unlock_irqrestore(&chan->lock, flags);
723 return ret;
724}
32a6d90b 725EXPORT_SYMBOL_GPL(cpdma_chan_submit);
ef8c2dab 726
fae50823
M		 727bool cpdma_check_free_tx_desc(struct cpdma_chan *chan)
728{
729 unsigned long flags;
730 int index;
731 bool ret;
732 struct cpdma_ctlr *ctlr = chan->ctlr;
733 struct cpdma_desc_pool *pool = ctlr->pool;
734
735 spin_lock_irqsave(&pool->lock, flags);
736
737 index = bitmap_find_next_zero_area(pool->bitmap,
738 pool->num_desc, pool->num_desc/2, 1, 0);
739
740 if (index < pool->num_desc)
741 ret = true;
742 else
743 ret = false;
744
745 spin_unlock_irqrestore(&pool->lock, flags);
746 return ret;
747}
748EXPORT_SYMBOL_GPL(cpdma_check_free_tx_desc);
749
ef8c2dab
CC		 750static void __cpdma_chan_free(struct cpdma_chan *chan,
751 struct cpdma_desc __iomem *desc,
752 int outlen, int status)
753{
754 struct cpdma_ctlr *ctlr = chan->ctlr;
755 struct cpdma_desc_pool *pool = ctlr->pool;
756 dma_addr_t buff_dma;
757 int origlen;
758 void *token;
759
760 token = (void *)desc_read(desc, sw_token);
761 buff_dma = desc_read(desc, sw_buffer);
762 origlen = desc_read(desc, sw_len);
763
764 dma_unmap_single(ctlr->dev, buff_dma, origlen, chan->dir);
765 cpdma_desc_free(pool, desc, 1);
766 (*chan->handler)(token, outlen, status);
767}
768
769static int __cpdma_chan_process(struct cpdma_chan *chan)
770{
771 struct cpdma_ctlr *ctlr = chan->ctlr;
772 struct cpdma_desc __iomem *desc;
773 int status, outlen;
b4727e69 774 int cb_status = 0;
ef8c2dab
CC		 775 struct cpdma_desc_pool *pool = ctlr->pool;
776 dma_addr_t desc_dma;
777 unsigned long flags;
778
779 spin_lock_irqsave(&chan->lock, flags);
780
781 desc = chan->head;
782 if (!desc) {
783 chan->stats.empty_dequeue++;
784 status = -ENOENT;
785 goto unlock_ret;
786 }
787 desc_dma = desc_phys(pool, desc);
788
789 status = __raw_readl(&desc->hw_mode);
790 outlen = status & 0x7ff;
791 if (status & CPDMA_DESC_OWNER) {
792 chan->stats.busy_dequeue++;
793 status = -EBUSY;
794 goto unlock_ret;
795 }
28a19fe6
M		 796
797 if (status & CPDMA_DESC_PASS_CRC)
798 outlen -= CPDMA_DESC_CRC_LEN;
799
f6e135c8
M		 800 status = status & (CPDMA_DESC_EOQ | CPDMA_DESC_TD_COMPLETE |
801 CPDMA_DESC_PORT_MASK);
ef8c2dab
CC		 802
803 chan->head = desc_from_phys(pool, desc_read(desc, hw_next));
804 chan_write(chan, cp, desc_dma);
805 chan->count--;
806 chan->stats.good_dequeue++;
807
808 if (status & CPDMA_DESC_EOQ) {
809 chan->stats.requeue++;
810 chan_write(chan, hdp, desc_phys(pool, chan->head));
811 }
812
813 spin_unlock_irqrestore(&chan->lock, flags);
b4727e69
SS		 814 if (unlikely(status & CPDMA_DESC_TD_COMPLETE))
815 cb_status = -ENOSYS;
816 else
817 cb_status = status;
ef8c2dab 818
b4727e69 819 __cpdma_chan_free(chan, desc, outlen, cb_status);
ef8c2dab
CC		 820 return status;
821
822unlock_ret:
823 spin_unlock_irqrestore(&chan->lock, flags);
824 return status;
825}
826
827int cpdma_chan_process(struct cpdma_chan *chan, int quota)
828{
829 int used = 0, ret = 0;
830
831 if (chan->state != CPDMA_STATE_ACTIVE)
832 return -EINVAL;
833
834 while (used < quota) {
835 ret = __cpdma_chan_process(chan);
836 if (ret < 0)
837 break;
838 used++;
839 }
840 return used;
841}
32a6d90b 842EXPORT_SYMBOL_GPL(cpdma_chan_process);
ef8c2dab
CC		 843
844int cpdma_chan_start(struct cpdma_chan *chan)
845{
846 struct cpdma_ctlr *ctlr = chan->ctlr;
847 struct cpdma_desc_pool *pool = ctlr->pool;
848 unsigned long flags;
849
850 spin_lock_irqsave(&chan->lock, flags);
851 if (chan->state != CPDMA_STATE_IDLE) {
852 spin_unlock_irqrestore(&chan->lock, flags);
853 return -EBUSY;
854 }
855 if (ctlr->state != CPDMA_STATE_ACTIVE) {
856 spin_unlock_irqrestore(&chan->lock, flags);
857 return -EINVAL;
858 }
859 dma_reg_write(ctlr, chan->int_set, chan->mask);
860 chan->state = CPDMA_STATE_ACTIVE;
861 if (chan->head) {
862 chan_write(chan, hdp, desc_phys(pool, chan->head));
863 if (chan->rxfree)
864 chan_write(chan, rxfree, chan->count);
865 }
866
867 spin_unlock_irqrestore(&chan->lock, flags);
868 return 0;
869}
32a6d90b 870EXPORT_SYMBOL_GPL(cpdma_chan_start);
ef8c2dab
CC		 871
872int cpdma_chan_stop(struct cpdma_chan *chan)
873{
874 struct cpdma_ctlr *ctlr = chan->ctlr;
875 struct cpdma_desc_pool *pool = ctlr->pool;
876 unsigned long flags;
877 int ret;
817f6d1a 878 unsigned timeout;
ef8c2dab
CC		 879
880 spin_lock_irqsave(&chan->lock, flags);
cd11cf50 881 if (chan->state == CPDMA_STATE_TEARDOWN) {
ef8c2dab
CC		 882 spin_unlock_irqrestore(&chan->lock, flags);
883 return -EINVAL;
884 }
885
886 chan->state = CPDMA_STATE_TEARDOWN;
887 dma_reg_write(ctlr, chan->int_clear, chan->mask);
888
889 /* trigger teardown */
b4ad0428 890 dma_reg_write(ctlr, chan->td, chan_linear(chan));
ef8c2dab
CC		 891
892 /* wait for teardown complete */
817f6d1a
SS		 893 timeout = 100 * 100; /* 100 ms */
894 while (timeout) {
ef8c2dab
CC		 895 u32 cp = chan_read(chan, cp);
896 if ((cp & CPDMA_TEARDOWN_VALUE) == CPDMA_TEARDOWN_VALUE)
897 break;
817f6d1a
SS		 898 udelay(10);
899 timeout--;
ef8c2dab 900 }
817f6d1a 901 WARN_ON(!timeout);
ef8c2dab
CC		 902 chan_write(chan, cp, CPDMA_TEARDOWN_VALUE);
903
904 /* handle completed packets */
7746ab0a 905 spin_unlock_irqrestore(&chan->lock, flags);
ef8c2dab
CC		 906 do {
907 ret = __cpdma_chan_process(chan);
908 if (ret < 0)
909 break;
910 } while ((ret & CPDMA_DESC_TD_COMPLETE) == 0);
7746ab0a 911 spin_lock_irqsave(&chan->lock, flags);
ef8c2dab
CC		 912
913 /* remaining packets haven't been tx/rx'ed, clean them up */
914 while (chan->head) {
915 struct cpdma_desc __iomem *desc = chan->head;
916 dma_addr_t next_dma;
917
918 next_dma = desc_read(desc, hw_next);
919 chan->head = desc_from_phys(pool, next_dma);
ffb5ba90 920 chan->count--;
ef8c2dab
CC		 921 chan->stats.teardown_dequeue++;
922
923 /* issue callback without locks held */
924 spin_unlock_irqrestore(&chan->lock, flags);
925 __cpdma_chan_free(chan, desc, 0, -ENOSYS);
926 spin_lock_irqsave(&chan->lock, flags);
927 }
928
929 chan->state = CPDMA_STATE_IDLE;
930 spin_unlock_irqrestore(&chan->lock, flags);
931 return 0;
932}
32a6d90b 933EXPORT_SYMBOL_GPL(cpdma_chan_stop);
ef8c2dab
CC		 934
935int cpdma_chan_int_ctrl(struct cpdma_chan *chan, bool enable)
936{
937 unsigned long flags;
938
939 spin_lock_irqsave(&chan->lock, flags);
940 if (chan->state != CPDMA_STATE_ACTIVE) {
941 spin_unlock_irqrestore(&chan->lock, flags);
942 return -EINVAL;
943 }
944
945 dma_reg_write(chan->ctlr, enable ? chan->int_set : chan->int_clear,
946 chan->mask);
947 spin_unlock_irqrestore(&chan->lock, flags);
948
949 return 0;
950}
951
952struct cpdma_control_info {
953 u32 reg;
954 u32 shift, mask;
955 int access;
956#define ACCESS_RO BIT(0)
957#define ACCESS_WO BIT(1)
958#define ACCESS_RW (ACCESS_RO | ACCESS_WO)
959};
960
df784160 961static struct cpdma_control_info controls[] = {
ef8c2dab
CC		 962 [CPDMA_CMD_IDLE] = {CPDMA_DMACONTROL, 3, 1, ACCESS_WO},
963 [CPDMA_COPY_ERROR_FRAMES] = {CPDMA_DMACONTROL, 4, 1, ACCESS_RW},
964 [CPDMA_RX_OFF_LEN_UPDATE] = {CPDMA_DMACONTROL, 2, 1, ACCESS_RW},
965 [CPDMA_RX_OWNERSHIP_FLIP] = {CPDMA_DMACONTROL, 1, 1, ACCESS_RW},
966 [CPDMA_TX_PRIO_FIXED] = {CPDMA_DMACONTROL, 0, 1, ACCESS_RW},
967 [CPDMA_STAT_IDLE] = {CPDMA_DMASTATUS, 31, 1, ACCESS_RO},
968 [CPDMA_STAT_TX_ERR_CODE] = {CPDMA_DMASTATUS, 20, 0xf, ACCESS_RW},
969 [CPDMA_STAT_TX_ERR_CHAN] = {CPDMA_DMASTATUS, 16, 0x7, ACCESS_RW},
970 [CPDMA_STAT_RX_ERR_CODE] = {CPDMA_DMASTATUS, 12, 0xf, ACCESS_RW},
971 [CPDMA_STAT_RX_ERR_CHAN] = {CPDMA_DMASTATUS, 8, 0x7, ACCESS_RW},
972 [CPDMA_RX_BUFFER_OFFSET] = {CPDMA_RXBUFFOFS, 0, 0xffff, ACCESS_RW},
973};
974
975int cpdma_control_get(struct cpdma_ctlr *ctlr, int control)
976{
977 unsigned long flags;
978 struct cpdma_control_info *info = &controls[control];
979 int ret;
980
981 spin_lock_irqsave(&ctlr->lock, flags);
982
983 ret = -ENOTSUPP;
984 if (!ctlr->params.has_ext_regs)
985 goto unlock_ret;
986
987 ret = -EINVAL;
988 if (ctlr->state != CPDMA_STATE_ACTIVE)
989 goto unlock_ret;
990
991 ret = -ENOENT;
992 if (control < 0 || control >= ARRAY_SIZE(controls))
993 goto unlock_ret;
994
995 ret = -EPERM;
996 if ((info->access & ACCESS_RO) != ACCESS_RO)
997 goto unlock_ret;
998
999 ret = (dma_reg_read(ctlr, info->reg) >> info->shift) & info->mask;
1000
1001unlock_ret:
1002 spin_unlock_irqrestore(&ctlr->lock, flags);
1003 return ret;
1004}
1005
1006int cpdma_control_set(struct cpdma_ctlr *ctlr, int control, int value)
1007{
1008 unsigned long flags;
1009 struct cpdma_control_info *info = &controls[control];
1010 int ret;
1011 u32 val;
1012
1013 spin_lock_irqsave(&ctlr->lock, flags);
1014
1015 ret = -ENOTSUPP;
1016 if (!ctlr->params.has_ext_regs)
1017 goto unlock_ret;
1018
1019 ret = -EINVAL;
1020 if (ctlr->state != CPDMA_STATE_ACTIVE)
1021 goto unlock_ret;
1022
1023 ret = -ENOENT;
1024 if (control < 0 || control >= ARRAY_SIZE(controls))
1025 goto unlock_ret;
1026
1027 ret = -EPERM;
1028 if ((info->access & ACCESS_WO) != ACCESS_WO)
1029 goto unlock_ret;
1030
1031 val = dma_reg_read(ctlr, info->reg);
1032 val &= ~(info->mask << info->shift);
1033 val |= (value & info->mask) << info->shift;
1034 dma_reg_write(ctlr, info->reg, val);
1035 ret = 0;
1036
1037unlock_ret:
1038 spin_unlock_irqrestore(&ctlr->lock, flags);
1039 return ret;
1040}
6929e24e 1041EXPORT_SYMBOL_GPL(cpdma_control_set);
4bc21d41
SS		 1042
1043MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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