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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / soc / ti / knav_dma.c
blob6285cd8efb21bb9798249e7db404b5aeb16c1d8e
1 /*
2 * Copyright (C) 2014 Texas Instruments Incorporated
3 * Authors: Santosh Shilimkar <santosh.shilimkar@ti.com>
4 * Sandeep Nair <sandeep_n@ti.com>
5 * Cyril Chemparathy <cyril@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation version 2.
10 *
11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
12 * kind, whether express or implied; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17 #include <linux/io.h>
18 #include <linux/sched.h>
19 #include <linux/module.h>
20 #include <linux/dma-direction.h>
21 #include <linux/interrupt.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/of_dma.h>
24 #include <linux/of_address.h>
25 #include <linux/platform_device.h>
26 #include <linux/soc/ti/knav_dma.h>
27 #include <linux/debugfs.h>
28 #include <linux/seq_file.h>
29
30 #define REG_MASK 0xffffffff
31
32 #define DMA_LOOPBACK BIT(31)
33 #define DMA_ENABLE BIT(31)
34 #define DMA_TEARDOWN BIT(30)
35
36 #define DMA_TX_FILT_PSWORDS BIT(29)
37 #define DMA_TX_FILT_EINFO BIT(30)
38 #define DMA_TX_PRIO_SHIFT 0
39 #define DMA_RX_PRIO_SHIFT 16
40 #define DMA_PRIO_MASK GENMASK(3, 0)
41 #define DMA_PRIO_DEFAULT 0
42 #define DMA_RX_TIMEOUT_DEFAULT 17500 /* cycles */
43 #define DMA_RX_TIMEOUT_MASK GENMASK(16, 0)
44 #define DMA_RX_TIMEOUT_SHIFT 0
45
46 #define CHAN_HAS_EPIB BIT(30)
47 #define CHAN_HAS_PSINFO BIT(29)
48 #define CHAN_ERR_RETRY BIT(28)
49 #define CHAN_PSINFO_AT_SOP BIT(25)
50 #define CHAN_SOP_OFF_SHIFT 16
51 #define CHAN_SOP_OFF_MASK GENMASK(9, 0)
52 #define DESC_TYPE_SHIFT 26
53 #define DESC_TYPE_MASK GENMASK(2, 0)
54
55 /*
56 * QMGR & QNUM together make up 14 bits with QMGR as the 2 MSb's in the logical
57 * navigator cloud mapping scheme.
58 * using the 14bit physical queue numbers directly maps into this scheme.
59 */
60 #define CHAN_QNUM_MASK GENMASK(14, 0)
61 #define DMA_MAX_QMS 4
62 #define DMA_TIMEOUT 1 /* msecs */
63 #define DMA_INVALID_ID 0xffff
64
65 struct reg_global {
66 u32 revision;
67 u32 perf_control;
68 u32 emulation_control;
69 u32 priority_control;
70 u32 qm_base_address[DMA_MAX_QMS];
71 };
72
73 struct reg_chan {
74 u32 control;
75 u32 mode;
76 u32 __rsvd[6];
77 };
78
79 struct reg_tx_sched {
80 u32 prio;
81 };
82
83 struct reg_rx_flow {
84 u32 control;
85 u32 tags;
86 u32 tag_sel;
87 u32 fdq_sel[2];
88 u32 thresh[3];
89 };
90
91 struct knav_dma_pool_device {
92 struct device *dev;
93 struct list_head list;
94 };
95
96 struct knav_dma_device {
97 bool loopback, enable_all;
98 unsigned tx_priority, rx_priority, rx_timeout;
99 unsigned logical_queue_managers;
100 unsigned qm_base_address[DMA_MAX_QMS];
101 struct reg_global __iomem *reg_global;
102 struct reg_chan __iomem *reg_tx_chan;
103 struct reg_rx_flow __iomem *reg_rx_flow;
104 struct reg_chan __iomem *reg_rx_chan;
105 struct reg_tx_sched __iomem *reg_tx_sched;
106 unsigned max_rx_chan, max_tx_chan;
107 unsigned max_rx_flow;
108 char name[32];
109 atomic_t ref_count;
110 struct list_head list;
111 struct list_head chan_list;
112 spinlock_t lock;
113 };
114
115 struct knav_dma_chan {
116 enum dma_transfer_direction direction;
117 struct knav_dma_device *dma;
118 atomic_t ref_count;
119
120 /* registers */
121 struct reg_chan __iomem *reg_chan;
122 struct reg_tx_sched __iomem *reg_tx_sched;
123 struct reg_rx_flow __iomem *reg_rx_flow;
124
125 /* configuration stuff */
126 unsigned channel, flow;
127 struct knav_dma_cfg cfg;
128 struct list_head list;
129 spinlock_t lock;
130 };
131
132 #define chan_number(ch) ((ch->direction == DMA_MEM_TO_DEV) ? \
133 ch->channel : ch->flow)
134
135 static struct knav_dma_pool_device *kdev;
136
137 static bool device_ready;
138 bool knav_dma_device_ready(void)
139 {
140 return device_ready;
141 }
142 EXPORT_SYMBOL_GPL(knav_dma_device_ready);
143
144 static bool check_config(struct knav_dma_chan *chan, struct knav_dma_cfg *cfg)
145 {
146 if (!memcmp(&chan->cfg, cfg, sizeof(*cfg)))
147 return true;
148 else
149 return false;
150 }
151
152 static int chan_start(struct knav_dma_chan *chan,
153 struct knav_dma_cfg *cfg)
154 {
155 u32 v = 0;
156
157 spin_lock(&chan->lock);
158 if ((chan->direction == DMA_MEM_TO_DEV) && chan->reg_chan) {
159 if (cfg->u.tx.filt_pswords)
160 v |= DMA_TX_FILT_PSWORDS;
161 if (cfg->u.tx.filt_einfo)
162 v |= DMA_TX_FILT_EINFO;
163 writel_relaxed(v, &chan->reg_chan->mode);
164 writel_relaxed(DMA_ENABLE, &chan->reg_chan->control);
165 }
166
167 if (chan->reg_tx_sched)
168 writel_relaxed(cfg->u.tx.priority, &chan->reg_tx_sched->prio);
169
170 if (chan->reg_rx_flow) {
171 v = 0;
172
173 if (cfg->u.rx.einfo_present)
174 v |= CHAN_HAS_EPIB;
175 if (cfg->u.rx.psinfo_present)
176 v |= CHAN_HAS_PSINFO;
177 if (cfg->u.rx.err_mode == DMA_RETRY)
178 v |= CHAN_ERR_RETRY;
179 v |= (cfg->u.rx.desc_type & DESC_TYPE_MASK) << DESC_TYPE_SHIFT;
180 if (cfg->u.rx.psinfo_at_sop)
181 v |= CHAN_PSINFO_AT_SOP;
182 v |= (cfg->u.rx.sop_offset & CHAN_SOP_OFF_MASK)
183 << CHAN_SOP_OFF_SHIFT;
184 v |= cfg->u.rx.dst_q & CHAN_QNUM_MASK;
185
186 writel_relaxed(v, &chan->reg_rx_flow->control);
187 writel_relaxed(0, &chan->reg_rx_flow->tags);
188 writel_relaxed(0, &chan->reg_rx_flow->tag_sel);
189
190 v = cfg->u.rx.fdq[0] << 16;
191 v |= cfg->u.rx.fdq[1] & CHAN_QNUM_MASK;
192 writel_relaxed(v, &chan->reg_rx_flow->fdq_sel[0]);
193
194 v = cfg->u.rx.fdq[2] << 16;
195 v |= cfg->u.rx.fdq[3] & CHAN_QNUM_MASK;
196 writel_relaxed(v, &chan->reg_rx_flow->fdq_sel[1]);
197
198 writel_relaxed(0, &chan->reg_rx_flow->thresh[0]);
199 writel_relaxed(0, &chan->reg_rx_flow->thresh[1]);
200 writel_relaxed(0, &chan->reg_rx_flow->thresh[2]);
201 }
202
203 /* Keep a copy of the cfg */
204 memcpy(&chan->cfg, cfg, sizeof(*cfg));
205 spin_unlock(&chan->lock);
206
207 return 0;
208 }
209
210 static int chan_teardown(struct knav_dma_chan *chan)
211 {
212 unsigned long end, value;
213
214 if (!chan->reg_chan)
215 return 0;
216
217 /* indicate teardown */
218 writel_relaxed(DMA_TEARDOWN, &chan->reg_chan->control);
219
220 /* wait for the dma to shut itself down */
221 end = jiffies + msecs_to_jiffies(DMA_TIMEOUT);
222 do {
223 value = readl_relaxed(&chan->reg_chan->control);
224 if ((value & DMA_ENABLE) == 0)
225 break;
226 } while (time_after(end, jiffies));
227
228 if (readl_relaxed(&chan->reg_chan->control) & DMA_ENABLE) {
229 dev_err(kdev->dev, "timeout waiting for teardown\n");
230 return -ETIMEDOUT;
231 }
232
233 return 0;
234 }
235
236 static void chan_stop(struct knav_dma_chan *chan)
237 {
238 spin_lock(&chan->lock);
239 if (chan->reg_rx_flow) {
240 /* first detach fdqs, starve out the flow */
241 writel_relaxed(0, &chan->reg_rx_flow->fdq_sel[0]);
242 writel_relaxed(0, &chan->reg_rx_flow->fdq_sel[1]);
243 writel_relaxed(0, &chan->reg_rx_flow->thresh[0]);
244 writel_relaxed(0, &chan->reg_rx_flow->thresh[1]);
245 writel_relaxed(0, &chan->reg_rx_flow->thresh[2]);
246 }
247
248 /* teardown the dma channel */
249 chan_teardown(chan);
250
251 /* then disconnect the completion side */
252 if (chan->reg_rx_flow) {
253 writel_relaxed(0, &chan->reg_rx_flow->control);
254 writel_relaxed(0, &chan->reg_rx_flow->tags);
255 writel_relaxed(0, &chan->reg_rx_flow->tag_sel);
256 }
257
258 memset(&chan->cfg, 0, sizeof(struct knav_dma_cfg));
259 spin_unlock(&chan->lock);
260
261 dev_dbg(kdev->dev, "channel stopped\n");
262 }
263
264 static void dma_hw_enable_all(struct knav_dma_device *dma)
265 {
266 int i;
267
268 for (i = 0; i < dma->max_tx_chan; i++) {
269 writel_relaxed(0, &dma->reg_tx_chan[i].mode);
270 writel_relaxed(DMA_ENABLE, &dma->reg_tx_chan[i].control);
271 }
272 }
273
274
275 static void knav_dma_hw_init(struct knav_dma_device *dma)
276 {
277 unsigned v;
278 int i;
279
280 spin_lock(&dma->lock);
281 v = dma->loopback ? DMA_LOOPBACK : 0;
282 writel_relaxed(v, &dma->reg_global->emulation_control);
283
284 v = readl_relaxed(&dma->reg_global->perf_control);
285 v |= ((dma->rx_timeout & DMA_RX_TIMEOUT_MASK) << DMA_RX_TIMEOUT_SHIFT);
286 writel_relaxed(v, &dma->reg_global->perf_control);
287
288 v = ((dma->tx_priority << DMA_TX_PRIO_SHIFT) |
289 (dma->rx_priority << DMA_RX_PRIO_SHIFT));
290
291 writel_relaxed(v, &dma->reg_global->priority_control);
292
293 /* Always enable all Rx channels. Rx paths are managed using flows */
294 for (i = 0; i < dma->max_rx_chan; i++)
295 writel_relaxed(DMA_ENABLE, &dma->reg_rx_chan[i].control);
296
297 for (i = 0; i < dma->logical_queue_managers; i++)
298 writel_relaxed(dma->qm_base_address[i],
299 &dma->reg_global->qm_base_address[i]);
300 spin_unlock(&dma->lock);
301 }
302
303 static void knav_dma_hw_destroy(struct knav_dma_device *dma)
304 {
305 int i;
306 unsigned v;
307
308 spin_lock(&dma->lock);
309 v = ~DMA_ENABLE & REG_MASK;
310
311 for (i = 0; i < dma->max_rx_chan; i++)
312 writel_relaxed(v, &dma->reg_rx_chan[i].control);
313
314 for (i = 0; i < dma->max_tx_chan; i++)
315 writel_relaxed(v, &dma->reg_tx_chan[i].control);
316 spin_unlock(&dma->lock);
317 }
318
319 static void dma_debug_show_channels(struct seq_file *s,
320 struct knav_dma_chan *chan)
321 {
322 int i;
323
324 seq_printf(s, "\t%s %d:\t",
325 ((chan->direction == DMA_MEM_TO_DEV) ? "tx chan" : "rx flow"),
326 chan_number(chan));
327
328 if (chan->direction == DMA_MEM_TO_DEV) {
329 seq_printf(s, "einfo - %d, pswords - %d, priority - %d\n",
330 chan->cfg.u.tx.filt_einfo,
331 chan->cfg.u.tx.filt_pswords,
332 chan->cfg.u.tx.priority);
333 } else {
334 seq_printf(s, "einfo - %d, psinfo - %d, desc_type - %d\n",
335 chan->cfg.u.rx.einfo_present,
336 chan->cfg.u.rx.psinfo_present,
337 chan->cfg.u.rx.desc_type);
338 seq_printf(s, "\t\t\tdst_q: [%d], thresh: %d fdq: ",
339 chan->cfg.u.rx.dst_q,
340 chan->cfg.u.rx.thresh);
341 for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN; i++)
342 seq_printf(s, "[%d]", chan->cfg.u.rx.fdq[i]);
343 seq_printf(s, "\n");
344 }
345 }
346
347 static void dma_debug_show_devices(struct seq_file *s,
348 struct knav_dma_device *dma)
349 {
350 struct knav_dma_chan *chan;
351
352 list_for_each_entry(chan, &dma->chan_list, list) {
353 if (atomic_read(&chan->ref_count))
354 dma_debug_show_channels(s, chan);
355 }
356 }
357
358 static int dma_debug_show(struct seq_file *s, void *v)
359 {
360 struct knav_dma_device *dma;
361
362 list_for_each_entry(dma, &kdev->list, list) {
363 if (atomic_read(&dma->ref_count)) {
364 seq_printf(s, "%s : max_tx_chan: (%d), max_rx_flows: (%d)\n",
365 dma->name, dma->max_tx_chan, dma->max_rx_flow);
366 dma_debug_show_devices(s, dma);
367 }
368 }
369
370 return 0;
371 }
372
373 static int knav_dma_debug_open(struct inode *inode, struct file *file)
374 {
375 return single_open(file, dma_debug_show, NULL);
376 }
377
378 static const struct file_operations knav_dma_debug_ops = {
379 .open = knav_dma_debug_open,
380 .read = seq_read,
381 .llseek = seq_lseek,
382 .release = single_release,
383 };
384
385 static int of_channel_match_helper(struct device_node *np, const char *name,
386 const char **dma_instance)
387 {
388 struct of_phandle_args args;
389 struct device_node *dma_node;
390 int index;
391
392 dma_node = of_parse_phandle(np, "ti,navigator-dmas", 0);
393 if (!dma_node)
394 return -ENODEV;
395
396 *dma_instance = dma_node->name;
397 index = of_property_match_string(np, "ti,navigator-dma-names", name);
398 if (index < 0) {
399 dev_err(kdev->dev, "No 'ti,navigator-dma-names' property\n");
400 return -ENODEV;
401 }
402
403 if (of_parse_phandle_with_fixed_args(np, "ti,navigator-dmas",
404 1, index, &args)) {
405 dev_err(kdev->dev, "Missing the phandle args name %s\n", name);
406 return -ENODEV;
407 }
408
409 if (args.args[0] < 0) {
410 dev_err(kdev->dev, "Missing args for %s\n", name);
411 return -ENODEV;
412 }
413
414 return args.args[0];
415 }
416
417 /**
418 * knav_dma_open_channel() - try to setup an exclusive slave channel
419 * @dev: pointer to client device structure
420 * @name: slave channel name
421 * @config: dma configuration parameters
422 *
423 * Returns pointer to appropriate DMA channel on success or error.
424 */
425 void *knav_dma_open_channel(struct device *dev, const char *name,
426 struct knav_dma_cfg *config)
427 {
428 struct knav_dma_chan *chan;
429 struct knav_dma_device *dma;
430 bool found = false;
431 int chan_num = -1;
432 const char *instance;
433
434 if (!kdev) {
435 pr_err("keystone-navigator-dma driver not registered\n");
436 return (void *)-EINVAL;
437 }
438
439 chan_num = of_channel_match_helper(dev->of_node, name, &instance);
440 if (chan_num < 0) {
441 dev_err(kdev->dev, "No DMA instance with name %s\n", name);
442 return (void *)-EINVAL;
443 }
444
445 dev_dbg(kdev->dev, "initializing %s channel %d from DMA %s\n",
446 config->direction == DMA_MEM_TO_DEV ? "transmit" :
447 config->direction == DMA_DEV_TO_MEM ? "receive" :
448 "unknown", chan_num, instance);
449
450 if (config->direction != DMA_MEM_TO_DEV &&
451 config->direction != DMA_DEV_TO_MEM) {
452 dev_err(kdev->dev, "bad direction\n");
453 return (void *)-EINVAL;
454 }
455
456 /* Look for correct dma instance */
457 list_for_each_entry(dma, &kdev->list, list) {
458 if (!strcmp(dma->name, instance)) {
459 found = true;
460 break;
461 }
462 }
463 if (!found) {
464 dev_err(kdev->dev, "No DMA instance with name %s\n", instance);
465 return (void *)-EINVAL;
466 }
467
468 /* Look for correct dma channel from dma instance */
469 found = false;
470 list_for_each_entry(chan, &dma->chan_list, list) {
471 if (config->direction == DMA_MEM_TO_DEV) {
472 if (chan->channel == chan_num) {
473 found = true;
474 break;
475 }
476 } else {
477 if (chan->flow == chan_num) {
478 found = true;
479 break;
480 }
481 }
482 }
483 if (!found) {
484 dev_err(kdev->dev, "channel %d is not in DMA %s\n",
485 chan_num, instance);
486 return (void *)-EINVAL;
487 }
488
489 if (atomic_read(&chan->ref_count) >= 1) {
490 if (!check_config(chan, config)) {
491 dev_err(kdev->dev, "channel %d config miss-match\n",
492 chan_num);
493 return (void *)-EINVAL;
494 }
495 }
496
497 if (atomic_inc_return(&chan->dma->ref_count) <= 1)
498 knav_dma_hw_init(chan->dma);
499
500 if (atomic_inc_return(&chan->ref_count) <= 1)
501 chan_start(chan, config);
502
503 dev_dbg(kdev->dev, "channel %d opened from DMA %s\n",
504 chan_num, instance);
505
506 return chan;
507 }
508 EXPORT_SYMBOL_GPL(knav_dma_open_channel);
509
510 /**
511 * knav_dma_close_channel() - Destroy a dma channel
512 *
513 * channel: dma channel handle
514 *
515 */
516 void knav_dma_close_channel(void *channel)
517 {
518 struct knav_dma_chan *chan = channel;
519
520 if (!kdev) {
521 pr_err("keystone-navigator-dma driver not registered\n");
522 return;
523 }
524
525 if (atomic_dec_return(&chan->ref_count) <= 0)
526 chan_stop(chan);
527
528 if (atomic_dec_return(&chan->dma->ref_count) <= 0)
529 knav_dma_hw_destroy(chan->dma);
530
531 dev_dbg(kdev->dev, "channel %d or flow %d closed from DMA %s\n",
532 chan->channel, chan->flow, chan->dma->name);
533 }
534 EXPORT_SYMBOL_GPL(knav_dma_close_channel);
535
536 static void __iomem *pktdma_get_regs(struct knav_dma_device *dma,
537 struct device_node *node,
538 unsigned index, resource_size_t *_size)
539 {
540 struct device *dev = kdev->dev;
541 struct resource res;
542 void __iomem *regs;
543 int ret;
544
545 ret = of_address_to_resource(node, index, &res);
546 if (ret) {
547 dev_err(dev, "Can't translate of node(%pOFn) address for index(%d)\n",
548 node, index);
549 return ERR_PTR(ret);
550 }
551
552 regs = devm_ioremap_resource(kdev->dev, &res);
553 if (IS_ERR(regs))
554 dev_err(dev, "Failed to map register base for index(%d) node(%pOFn)\n",
555 index, node);
556 if (_size)
557 *_size = resource_size(&res);
558
559 return regs;
560 }
561
562 static int pktdma_init_rx_chan(struct knav_dma_chan *chan, u32 flow)
563 {
564 struct knav_dma_device *dma = chan->dma;
565
566 chan->flow = flow;
567 chan->reg_rx_flow = dma->reg_rx_flow + flow;
568 chan->channel = DMA_INVALID_ID;
569 dev_dbg(kdev->dev, "rx flow(%d) (%p)\n", chan->flow, chan->reg_rx_flow);
570
571 return 0;
572 }
573
574 static int pktdma_init_tx_chan(struct knav_dma_chan *chan, u32 channel)
575 {
576 struct knav_dma_device *dma = chan->dma;
577
578 chan->channel = channel;
579 chan->reg_chan = dma->reg_tx_chan + channel;
580 chan->reg_tx_sched = dma->reg_tx_sched + channel;
581 chan->flow = DMA_INVALID_ID;
582 dev_dbg(kdev->dev, "tx channel(%d) (%p)\n", chan->channel, chan->reg_chan);
583
584 return 0;
585 }
586
587 static int pktdma_init_chan(struct knav_dma_device *dma,
588 enum dma_transfer_direction dir,
589 unsigned chan_num)
590 {
591 struct device *dev = kdev->dev;
592 struct knav_dma_chan *chan;
593 int ret = -EINVAL;
594
595 chan = devm_kzalloc(dev, sizeof(*chan), GFP_KERNEL);
596 if (!chan)
597 return -ENOMEM;
598
599 INIT_LIST_HEAD(&chan->list);
600 chan->dma = dma;
601 chan->direction = DMA_TRANS_NONE;
602 atomic_set(&chan->ref_count, 0);
603 spin_lock_init(&chan->lock);
604
605 if (dir == DMA_MEM_TO_DEV) {
606 chan->direction = dir;
607 ret = pktdma_init_tx_chan(chan, chan_num);
608 } else if (dir == DMA_DEV_TO_MEM) {
609 chan->direction = dir;
610 ret = pktdma_init_rx_chan(chan, chan_num);
611 } else {
612 dev_err(dev, "channel(%d) direction unknown\n", chan_num);
613 }
614
615 list_add_tail(&chan->list, &dma->chan_list);
616
617 return ret;
618 }
619
620 static int dma_init(struct device_node *cloud, struct device_node *dma_node)
621 {
622 unsigned max_tx_chan, max_rx_chan, max_rx_flow, max_tx_sched;
623 struct device_node *node = dma_node;
624 struct knav_dma_device *dma;
625 int ret, len, num_chan = 0;
626 resource_size_t size;
627 u32 timeout;
628 u32 i;
629
630 dma = devm_kzalloc(kdev->dev, sizeof(*dma), GFP_KERNEL);
631 if (!dma) {
632 dev_err(kdev->dev, "could not allocate driver mem\n");
633 return -ENOMEM;
634 }
635 INIT_LIST_HEAD(&dma->list);
636 INIT_LIST_HEAD(&dma->chan_list);
637
638 if (!of_find_property(cloud, "ti,navigator-cloud-address", &len)) {
639 dev_err(kdev->dev, "unspecified navigator cloud addresses\n");
640 return -ENODEV;
641 }
642
643 dma->logical_queue_managers = len / sizeof(u32);
644 if (dma->logical_queue_managers > DMA_MAX_QMS) {
645 dev_warn(kdev->dev, "too many queue mgrs(>%d) rest ignored\n",
646 dma->logical_queue_managers);
647 dma->logical_queue_managers = DMA_MAX_QMS;
648 }
649
650 ret = of_property_read_u32_array(cloud, "ti,navigator-cloud-address",
651 dma->qm_base_address,
652 dma->logical_queue_managers);
653 if (ret) {
654 dev_err(kdev->dev, "invalid navigator cloud addresses\n");
655 return -ENODEV;
656 }
657
658 dma->reg_global = pktdma_get_regs(dma, node, 0, &size);
659 if (!dma->reg_global)
660 return -ENODEV;
661 if (size < sizeof(struct reg_global)) {
662 dev_err(kdev->dev, "bad size %pa for global regs\n", &size);
663 return -ENODEV;
664 }
665
666 dma->reg_tx_chan = pktdma_get_regs(dma, node, 1, &size);
667 if (!dma->reg_tx_chan)
668 return -ENODEV;
669
670 max_tx_chan = size / sizeof(struct reg_chan);
671 dma->reg_rx_chan = pktdma_get_regs(dma, node, 2, &size);
672 if (!dma->reg_rx_chan)
673 return -ENODEV;
674
675 max_rx_chan = size / sizeof(struct reg_chan);
676 dma->reg_tx_sched = pktdma_get_regs(dma, node, 3, &size);
677 if (!dma->reg_tx_sched)
678 return -ENODEV;
679
680 max_tx_sched = size / sizeof(struct reg_tx_sched);
681 dma->reg_rx_flow = pktdma_get_regs(dma, node, 4, &size);
682 if (!dma->reg_rx_flow)
683 return -ENODEV;
684
685 max_rx_flow = size / sizeof(struct reg_rx_flow);
686 dma->rx_priority = DMA_PRIO_DEFAULT;
687 dma->tx_priority = DMA_PRIO_DEFAULT;
688
689 dma->enable_all = (of_get_property(node, "ti,enable-all", NULL) != NULL);
690 dma->loopback = (of_get_property(node, "ti,loop-back", NULL) != NULL);
691
692 ret = of_property_read_u32(node, "ti,rx-retry-timeout", &timeout);
693 if (ret < 0) {
694 dev_dbg(kdev->dev, "unspecified rx timeout using value %d\n",
695 DMA_RX_TIMEOUT_DEFAULT);
696 timeout = DMA_RX_TIMEOUT_DEFAULT;
697 }
698
699 dma->rx_timeout = timeout;
700 dma->max_rx_chan = max_rx_chan;
701 dma->max_rx_flow = max_rx_flow;
702 dma->max_tx_chan = min(max_tx_chan, max_tx_sched);
703 atomic_set(&dma->ref_count, 0);
704 strcpy(dma->name, node->name);
705 spin_lock_init(&dma->lock);
706
707 for (i = 0; i < dma->max_tx_chan; i++) {
708 if (pktdma_init_chan(dma, DMA_MEM_TO_DEV, i) >= 0)
709 num_chan++;
710 }
711
712 for (i = 0; i < dma->max_rx_flow; i++) {
713 if (pktdma_init_chan(dma, DMA_DEV_TO_MEM, i) >= 0)
714 num_chan++;
715 }
716
717 list_add_tail(&dma->list, &kdev->list);
718
719 /*
720 * For DSP software usecases or userpace transport software, setup all
721 * the DMA hardware resources.
722 */
723 if (dma->enable_all) {
724 atomic_inc(&dma->ref_count);
725 knav_dma_hw_init(dma);
726 dma_hw_enable_all(dma);
727 }
728
729 dev_info(kdev->dev, "DMA %s registered %d logical channels, flows %d, tx chans: %d, rx chans: %d%s\n",
730 dma->name, num_chan, dma->max_rx_flow,
731 dma->max_tx_chan, dma->max_rx_chan,
732 dma->loopback ? ", loopback" : "");
733
734 return 0;
735 }
736
737 static int knav_dma_probe(struct platform_device *pdev)
738 {
739 struct device *dev = &pdev->dev;
740 struct device_node *node = pdev->dev.of_node;
741 struct device_node *child;
742 int ret = 0;
743
744 if (!node) {
745 dev_err(&pdev->dev, "could not find device info\n");
746 return -EINVAL;
747 }
748
749 kdev = devm_kzalloc(dev,
750 sizeof(struct knav_dma_pool_device), GFP_KERNEL);
751 if (!kdev) {
752 dev_err(dev, "could not allocate driver mem\n");
753 return -ENOMEM;
754 }
755
756 kdev->dev = dev;
757 INIT_LIST_HEAD(&kdev->list);
758
759 pm_runtime_enable(kdev->dev);
760 ret = pm_runtime_get_sync(kdev->dev);
761 if (ret < 0) {
762 dev_err(kdev->dev, "unable to enable pktdma, err %d\n", ret);
763 return ret;
764 }
765
766 /* Initialise all packet dmas */
767 for_each_child_of_node(node, child) {
768 ret = dma_init(node, child);
769 if (ret) {
770 dev_err(&pdev->dev, "init failed with %d\n", ret);
771 break;
772 }
773 }
774
775 if (list_empty(&kdev->list)) {
776 dev_err(dev, "no valid dma instance\n");
777 return -ENODEV;
778 }
779
780 debugfs_create_file("knav_dma", S_IFREG | S_IRUGO, NULL, NULL,
781 &knav_dma_debug_ops);
782
783 device_ready = true;
784 return ret;
785 }
786
787 static int knav_dma_remove(struct platform_device *pdev)
788 {
789 struct knav_dma_device *dma;
790
791 list_for_each_entry(dma, &kdev->list, list) {
792 if (atomic_dec_return(&dma->ref_count) == 0)
793 knav_dma_hw_destroy(dma);
794 }
795
796 pm_runtime_put_sync(&pdev->dev);
797 pm_runtime_disable(&pdev->dev);
798
799 return 0;
800 }
801
802 static struct of_device_id of_match[] = {
803 { .compatible = "ti,keystone-navigator-dma", },
804 {},
805 };
806
807 MODULE_DEVICE_TABLE(of, of_match);
808
809 static struct platform_driver knav_dma_driver = {
810 .probe = knav_dma_probe,
811 .remove = knav_dma_remove,
812 .driver = {
813 .name = "keystone-navigator-dma",
814 .of_match_table = of_match,
815 },
816 };
817 module_platform_driver(knav_dma_driver);
818
819 MODULE_LICENSE("GPL v2");
820 MODULE_DESCRIPTION("TI Keystone Navigator Packet DMA driver");
821 MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com>");
822 MODULE_AUTHOR("Santosh Shilimkar <santosh.shilimkar@ti.com>");
Linux with added FPC-III support