1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2014 Texas Instruments Incorporated
4 * Authors: Santosh Shilimkar <santosh.shilimkar@ti.com>
5 * Sandeep Nair <sandeep_n@ti.com>
6 * Cyril Chemparathy <cyril@ti.com>
7 */
8
9 #include <linux/io.h>
10 #include <linux/sched.h>
11 #include <linux/module.h>
12 #include <linux/dma-direction.h>
13 #include <linux/interrupt.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/of_dma.h>
16 #include <linux/of_address.h>
17 #include <linux/platform_device.h>
18 #include <linux/soc/ti/knav_dma.h>
19 #include <linux/debugfs.h>
20 #include <linux/seq_file.h>
21
22 #define REG_MASK 0xffffffff
23
24 #define DMA_LOOPBACK BIT(31)
25 #define DMA_ENABLE BIT(31)
26 #define DMA_TEARDOWN BIT(30)
27
28 #define DMA_TX_FILT_PSWORDS BIT(29)
29 #define DMA_TX_FILT_EINFO BIT(30)
30 #define DMA_TX_PRIO_SHIFT 0
31 #define DMA_RX_PRIO_SHIFT 16
32 #define DMA_PRIO_MASK GENMASK(3, 0)
33 #define DMA_PRIO_DEFAULT 0
34 #define DMA_RX_TIMEOUT_DEFAULT 17500 /* cycles */
35 #define DMA_RX_TIMEOUT_MASK GENMASK(16, 0)
36 #define DMA_RX_TIMEOUT_SHIFT 0
37
38 #define CHAN_HAS_EPIB BIT(30)
39 #define CHAN_HAS_PSINFO BIT(29)
40 #define CHAN_ERR_RETRY BIT(28)
41 #define CHAN_PSINFO_AT_SOP BIT(25)
42 #define CHAN_SOP_OFF_SHIFT 16
43 #define CHAN_SOP_OFF_MASK GENMASK(9, 0)
44 #define DESC_TYPE_SHIFT 26
45 #define DESC_TYPE_MASK GENMASK(2, 0)
46
47 /*
48 * QMGR & QNUM together make up 14 bits with QMGR as the 2 MSb's in the logical
49 * navigator cloud mapping scheme.
50 * using the 14bit physical queue numbers directly maps into this scheme.
51 */
52 #define CHAN_QNUM_MASK GENMASK(14, 0)
53 #define DMA_MAX_QMS 4
54 #define DMA_TIMEOUT 1 /* msecs */
55 #define DMA_INVALID_ID 0xffff
56
57 struct reg_global {
58 u32 revision;
59 u32 perf_control;
60 u32 emulation_control;
61 u32 priority_control;
62 u32 qm_base_address[DMA_MAX_QMS];
63 };
64
65 struct reg_chan {
66 u32 control;
67 u32 mode;
68 u32 __rsvd[6];
69 };
70
71 struct reg_tx_sched {
72 u32 prio;
73 };
74
75 struct reg_rx_flow {
76 u32 control;
77 u32 tags;
78 u32 tag_sel;
79 u32 fdq_sel[2];
80 u32 thresh[3];
81 };
82
83 struct knav_dma_pool_device {
84 struct device *dev;
85 struct list_head list;
86 };
87
88 struct knav_dma_device {
89 bool loopback, enable_all;
90 unsigned tx_priority, rx_priority, rx_timeout;
91 unsigned logical_queue_managers;
92 unsigned qm_base_address[DMA_MAX_QMS];
93 struct reg_global __iomem *reg_global;
94 struct reg_chan __iomem *reg_tx_chan;
95 struct reg_rx_flow __iomem *reg_rx_flow;
96 struct reg_chan __iomem *reg_rx_chan;
97 struct reg_tx_sched __iomem *reg_tx_sched;
98 unsigned max_rx_chan, max_tx_chan;
99 unsigned max_rx_flow;
100 char name[32];
101 atomic_t ref_count;
102 struct list_head list;
103 struct list_head chan_list;
104 spinlock_t lock;
105 };
106
107 struct knav_dma_chan {
108 enum dma_transfer_direction direction;
109 struct knav_dma_device *dma;
110 atomic_t ref_count;
111
112 /* registers */
113 struct reg_chan __iomem *reg_chan;
114 struct reg_tx_sched __iomem *reg_tx_sched;
115 struct reg_rx_flow __iomem *reg_rx_flow;
116
117 /* configuration stuff */
118 unsigned channel, flow;
119 struct knav_dma_cfg cfg;
120 struct list_head list;
121 spinlock_t lock;
122 };
123
124 #define chan_number(ch) ((ch->direction == DMA_MEM_TO_DEV) ? \
125 ch->channel : ch->flow)
126
127 static struct knav_dma_pool_device *kdev;
128
129 static bool device_ready;
knav_dma_device_ready(void)130 bool knav_dma_device_ready(void)
131 {
132 return device_ready;
133 }
134 EXPORT_SYMBOL_GPL(knav_dma_device_ready);
135
check_config(struct knav_dma_chan * chan,struct knav_dma_cfg * cfg)136 static bool check_config(struct knav_dma_chan *chan, struct knav_dma_cfg *cfg)
137 {
138 if (!memcmp(&chan->cfg, cfg, sizeof(*cfg)))
139 return true;
140 else
141 return false;
142 }
143
chan_start(struct knav_dma_chan * chan,struct knav_dma_cfg * cfg)144 static int chan_start(struct knav_dma_chan *chan,
145 struct knav_dma_cfg *cfg)
146 {
147 u32 v = 0;
148
149 spin_lock(&chan->lock);
150 if ((chan->direction == DMA_MEM_TO_DEV) && chan->reg_chan) {
151 if (cfg->u.tx.filt_pswords)
152 v |= DMA_TX_FILT_PSWORDS;
153 if (cfg->u.tx.filt_einfo)
154 v |= DMA_TX_FILT_EINFO;
155 writel_relaxed(v, &chan->reg_chan->mode);
156 writel_relaxed(DMA_ENABLE, &chan->reg_chan->control);
157 }
158
159 if (chan->reg_tx_sched)
160 writel_relaxed(cfg->u.tx.priority, &chan->reg_tx_sched->prio);
161
162 if (chan->reg_rx_flow) {
163 v = 0;
164
165 if (cfg->u.rx.einfo_present)
166 v |= CHAN_HAS_EPIB;
167 if (cfg->u.rx.psinfo_present)
168 v |= CHAN_HAS_PSINFO;
169 if (cfg->u.rx.err_mode == DMA_RETRY)
170 v |= CHAN_ERR_RETRY;
171 v |= (cfg->u.rx.desc_type & DESC_TYPE_MASK) << DESC_TYPE_SHIFT;
172 if (cfg->u.rx.psinfo_at_sop)
173 v |= CHAN_PSINFO_AT_SOP;
174 v |= (cfg->u.rx.sop_offset & CHAN_SOP_OFF_MASK)
175 << CHAN_SOP_OFF_SHIFT;
176 v |= cfg->u.rx.dst_q & CHAN_QNUM_MASK;
177
178 writel_relaxed(v, &chan->reg_rx_flow->control);
179 writel_relaxed(0, &chan->reg_rx_flow->tags);
180 writel_relaxed(0, &chan->reg_rx_flow->tag_sel);
181
182 v = cfg->u.rx.fdq[0] << 16;
183 v |= cfg->u.rx.fdq[1] & CHAN_QNUM_MASK;
184 writel_relaxed(v, &chan->reg_rx_flow->fdq_sel[0]);
185
186 v = cfg->u.rx.fdq[2] << 16;
187 v |= cfg->u.rx.fdq[3] & CHAN_QNUM_MASK;
188 writel_relaxed(v, &chan->reg_rx_flow->fdq_sel[1]);
189
190 writel_relaxed(0, &chan->reg_rx_flow->thresh[0]);
191 writel_relaxed(0, &chan->reg_rx_flow->thresh[1]);
192 writel_relaxed(0, &chan->reg_rx_flow->thresh[2]);
193 }
194
195 /* Keep a copy of the cfg */
196 memcpy(&chan->cfg, cfg, sizeof(*cfg));
197 spin_unlock(&chan->lock);
198
199 return 0;
200 }
201
chan_teardown(struct knav_dma_chan * chan)202 static int chan_teardown(struct knav_dma_chan *chan)
203 {
204 unsigned long end, value;
205
206 if (!chan->reg_chan)
207 return 0;
208
209 /* indicate teardown */
210 writel_relaxed(DMA_TEARDOWN, &chan->reg_chan->control);
211
212 /* wait for the dma to shut itself down */
213 end = jiffies + msecs_to_jiffies(DMA_TIMEOUT);
214 do {
215 value = readl_relaxed(&chan->reg_chan->control);
216 if ((value & DMA_ENABLE) == 0)
217 break;
218 } while (time_after(end, jiffies));
219
220 if (readl_relaxed(&chan->reg_chan->control) & DMA_ENABLE) {
221 dev_err(kdev->dev, "timeout waiting for teardown\n");
222 return -ETIMEDOUT;
223 }
224
225 return 0;
226 }
227
chan_stop(struct knav_dma_chan * chan)228 static void chan_stop(struct knav_dma_chan *chan)
229 {
230 spin_lock(&chan->lock);
231 if (chan->reg_rx_flow) {
232 /* first detach fdqs, starve out the flow */
233 writel_relaxed(0, &chan->reg_rx_flow->fdq_sel[0]);
234 writel_relaxed(0, &chan->reg_rx_flow->fdq_sel[1]);
235 writel_relaxed(0, &chan->reg_rx_flow->thresh[0]);
236 writel_relaxed(0, &chan->reg_rx_flow->thresh[1]);
237 writel_relaxed(0, &chan->reg_rx_flow->thresh[2]);
238 }
239
240 /* teardown the dma channel */
241 chan_teardown(chan);
242
243 /* then disconnect the completion side */
244 if (chan->reg_rx_flow) {
245 writel_relaxed(0, &chan->reg_rx_flow->control);
246 writel_relaxed(0, &chan->reg_rx_flow->tags);
247 writel_relaxed(0, &chan->reg_rx_flow->tag_sel);
248 }
249
250 memset(&chan->cfg, 0, sizeof(struct knav_dma_cfg));
251 spin_unlock(&chan->lock);
252
253 dev_dbg(kdev->dev, "channel stopped\n");
254 }
255
dma_hw_enable_all(struct knav_dma_device * dma)256 static void dma_hw_enable_all(struct knav_dma_device *dma)
257 {
258 int i;
259
260 for (i = 0; i < dma->max_tx_chan; i++) {
261 writel_relaxed(0, &dma->reg_tx_chan[i].mode);
262 writel_relaxed(DMA_ENABLE, &dma->reg_tx_chan[i].control);
263 }
264 }
265
266
knav_dma_hw_init(struct knav_dma_device * dma)267 static void knav_dma_hw_init(struct knav_dma_device *dma)
268 {
269 unsigned v;
270 int i;
271
272 spin_lock(&dma->lock);
273 v = dma->loopback ? DMA_LOOPBACK : 0;
274 writel_relaxed(v, &dma->reg_global->emulation_control);
275
276 v = readl_relaxed(&dma->reg_global->perf_control);
277 v |= ((dma->rx_timeout & DMA_RX_TIMEOUT_MASK) << DMA_RX_TIMEOUT_SHIFT);
278 writel_relaxed(v, &dma->reg_global->perf_control);
279
280 v = ((dma->tx_priority << DMA_TX_PRIO_SHIFT) |
281 (dma->rx_priority << DMA_RX_PRIO_SHIFT));
282
283 writel_relaxed(v, &dma->reg_global->priority_control);
284
285 /* Always enable all Rx channels. Rx paths are managed using flows */
286 for (i = 0; i < dma->max_rx_chan; i++)
287 writel_relaxed(DMA_ENABLE, &dma->reg_rx_chan[i].control);
288
289 for (i = 0; i < dma->logical_queue_managers; i++)
290 writel_relaxed(dma->qm_base_address[i],
291 &dma->reg_global->qm_base_address[i]);
292 spin_unlock(&dma->lock);
293 }
294
knav_dma_hw_destroy(struct knav_dma_device * dma)295 static void knav_dma_hw_destroy(struct knav_dma_device *dma)
296 {
297 int i;
298 unsigned v;
299
300 spin_lock(&dma->lock);
301 v = ~DMA_ENABLE & REG_MASK;
302
303 for (i = 0; i < dma->max_rx_chan; i++)
304 writel_relaxed(v, &dma->reg_rx_chan[i].control);
305
306 for (i = 0; i < dma->max_tx_chan; i++)
307 writel_relaxed(v, &dma->reg_tx_chan[i].control);
308 spin_unlock(&dma->lock);
309 }
310
dma_debug_show_channels(struct seq_file * s,struct knav_dma_chan * chan)311 static void dma_debug_show_channels(struct seq_file *s,
312 struct knav_dma_chan *chan)
313 {
314 int i;
315
316 seq_printf(s, "\t%s %d:\t",
317 ((chan->direction == DMA_MEM_TO_DEV) ? "tx chan" : "rx flow"),
318 chan_number(chan));
319
320 if (chan->direction == DMA_MEM_TO_DEV) {
321 seq_printf(s, "einfo - %d, pswords - %d, priority - %d\n",
322 chan->cfg.u.tx.filt_einfo,
323 chan->cfg.u.tx.filt_pswords,
324 chan->cfg.u.tx.priority);
325 } else {
326 seq_printf(s, "einfo - %d, psinfo - %d, desc_type - %d\n",
327 chan->cfg.u.rx.einfo_present,
328 chan->cfg.u.rx.psinfo_present,
329 chan->cfg.u.rx.desc_type);
330 seq_printf(s, "\t\t\tdst_q: [%d], thresh: %d fdq: ",
331 chan->cfg.u.rx.dst_q,
332 chan->cfg.u.rx.thresh);
333 for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN; i++)
334 seq_printf(s, "[%d]", chan->cfg.u.rx.fdq[i]);
335 seq_printf(s, "\n");
336 }
337 }
338
dma_debug_show_devices(struct seq_file * s,struct knav_dma_device * dma)339 static void dma_debug_show_devices(struct seq_file *s,
340 struct knav_dma_device *dma)
341 {
342 struct knav_dma_chan *chan;
343
344 list_for_each_entry(chan, &dma->chan_list, list) {
345 if (atomic_read(&chan->ref_count))
346 dma_debug_show_channels(s, chan);
347 }
348 }
349
knav_dma_debug_show(struct seq_file * s,void * v)350 static int knav_dma_debug_show(struct seq_file *s, void *v)
351 {
352 struct knav_dma_device *dma;
353
354 list_for_each_entry(dma, &kdev->list, list) {
355 if (atomic_read(&dma->ref_count)) {
356 seq_printf(s, "%s : max_tx_chan: (%d), max_rx_flows: (%d)\n",
357 dma->name, dma->max_tx_chan, dma->max_rx_flow);
358 dma_debug_show_devices(s, dma);
359 }
360 }
361
362 return 0;
363 }
364
365 DEFINE_SHOW_ATTRIBUTE(knav_dma_debug);
366
of_channel_match_helper(struct device_node * np,const char * name,const char ** dma_instance)367 static int of_channel_match_helper(struct device_node *np, const char *name,
368 const char **dma_instance)
369 {
370 struct of_phandle_args args;
371 struct device_node *dma_node;
372 int index;
373
374 dma_node = of_parse_phandle(np, "ti,navigator-dmas", 0);
375 if (!dma_node)
376 return -ENODEV;
377
378 *dma_instance = dma_node->name;
379 index = of_property_match_string(np, "ti,navigator-dma-names", name);
380 if (index < 0) {
381 dev_err(kdev->dev, "No 'ti,navigator-dma-names' property\n");
382 return -ENODEV;
383 }
384
385 if (of_parse_phandle_with_fixed_args(np, "ti,navigator-dmas",
386 1, index, &args)) {
387 dev_err(kdev->dev, "Missing the phandle args name %s\n", name);
388 return -ENODEV;
389 }
390
391 if (args.args[0] < 0) {
392 dev_err(kdev->dev, "Missing args for %s\n", name);
393 return -ENODEV;
394 }
395
396 return args.args[0];
397 }
398
399 /**
400 * knav_dma_open_channel() - try to setup an exclusive slave channel
401 * @dev: pointer to client device structure
402 * @name: slave channel name
403 * @config: dma configuration parameters
404 *
405 * Returns pointer to appropriate DMA channel on success or error.
406 */
knav_dma_open_channel(struct device * dev,const char * name,struct knav_dma_cfg * config)407 void *knav_dma_open_channel(struct device *dev, const char *name,
408 struct knav_dma_cfg *config)
409 {
410 struct knav_dma_device *dma = NULL, *iter1;
411 struct knav_dma_chan *chan = NULL, *iter2;
412 int chan_num = -1;
413 const char *instance;
414
415 if (!kdev) {
416 pr_err("keystone-navigator-dma driver not registered\n");
417 return (void *)-EINVAL;
418 }
419
420 chan_num = of_channel_match_helper(dev->of_node, name, &instance);
421 if (chan_num < 0) {
422 dev_err(kdev->dev, "No DMA instance with name %s\n", name);
423 return (void *)-EINVAL;
424 }
425
426 dev_dbg(kdev->dev, "initializing %s channel %d from DMA %s\n",
427 config->direction == DMA_MEM_TO_DEV ? "transmit" :
428 config->direction == DMA_DEV_TO_MEM ? "receive" :
429 "unknown", chan_num, instance);
430
431 if (config->direction != DMA_MEM_TO_DEV &&
432 config->direction != DMA_DEV_TO_MEM) {
433 dev_err(kdev->dev, "bad direction\n");
434 return (void *)-EINVAL;
435 }
436
437 /* Look for correct dma instance */
438 list_for_each_entry(iter1, &kdev->list, list) {
439 if (!strcmp(iter1->name, instance)) {
440 dma = iter1;
441 break;
442 }
443 }
444 if (!dma) {
445 dev_err(kdev->dev, "No DMA instance with name %s\n", instance);
446 return (void *)-EINVAL;
447 }
448
449 /* Look for correct dma channel from dma instance */
450 list_for_each_entry(iter2, &dma->chan_list, list) {
451 if (config->direction == DMA_MEM_TO_DEV) {
452 if (iter2->channel == chan_num) {
453 chan = iter2;
454 break;
455 }
456 } else {
457 if (iter2->flow == chan_num) {
458 chan = iter2;
459 break;
460 }
461 }
462 }
463 if (!chan) {
464 dev_err(kdev->dev, "channel %d is not in DMA %s\n",
465 chan_num, instance);
466 return (void *)-EINVAL;
467 }
468
469 if (atomic_read(&chan->ref_count) >= 1) {
470 if (!check_config(chan, config)) {
471 dev_err(kdev->dev, "channel %d config miss-match\n",
472 chan_num);
473 return (void *)-EINVAL;
474 }
475 }
476
477 if (atomic_inc_return(&chan->dma->ref_count) <= 1)
478 knav_dma_hw_init(chan->dma);
479
480 if (atomic_inc_return(&chan->ref_count) <= 1)
481 chan_start(chan, config);
482
483 dev_dbg(kdev->dev, "channel %d opened from DMA %s\n",
484 chan_num, instance);
485
486 return chan;
487 }
488 EXPORT_SYMBOL_GPL(knav_dma_open_channel);
489
490 /**
491 * knav_dma_close_channel() - Destroy a dma channel
492 *
493 * @channel: dma channel handle
494 *
495 */
knav_dma_close_channel(void * channel)496 void knav_dma_close_channel(void *channel)
497 {
498 struct knav_dma_chan *chan = channel;
499
500 if (!kdev) {
501 pr_err("keystone-navigator-dma driver not registered\n");
502 return;
503 }
504
505 if (atomic_dec_return(&chan->ref_count) <= 0)
506 chan_stop(chan);
507
508 if (atomic_dec_return(&chan->dma->ref_count) <= 0)
509 knav_dma_hw_destroy(chan->dma);
510
511 dev_dbg(kdev->dev, "channel %d or flow %d closed from DMA %s\n",
512 chan->channel, chan->flow, chan->dma->name);
513 }
514 EXPORT_SYMBOL_GPL(knav_dma_close_channel);
515
pktdma_get_regs(struct knav_dma_device * dma,struct device_node * node,unsigned index,resource_size_t * _size)516 static void __iomem *pktdma_get_regs(struct knav_dma_device *dma,
517 struct device_node *node,
518 unsigned index, resource_size_t *_size)
519 {
520 struct device *dev = kdev->dev;
521 struct resource res;
522 void __iomem *regs;
523 int ret;
524
525 ret = of_address_to_resource(node, index, &res);
526 if (ret) {
527 dev_err(dev, "Can't translate of node(%pOFn) address for index(%d)\n",
528 node, index);
529 return ERR_PTR(ret);
530 }
531
532 regs = devm_ioremap_resource(kdev->dev, &res);
533 if (IS_ERR(regs))
534 dev_err(dev, "Failed to map register base for index(%d) node(%pOFn)\n",
535 index, node);
536 if (_size)
537 *_size = resource_size(&res);
538
539 return regs;
540 }
541
pktdma_init_rx_chan(struct knav_dma_chan * chan,u32 flow)542 static int pktdma_init_rx_chan(struct knav_dma_chan *chan, u32 flow)
543 {
544 struct knav_dma_device *dma = chan->dma;
545
546 chan->flow = flow;
547 chan->reg_rx_flow = dma->reg_rx_flow + flow;
548 chan->channel = DMA_INVALID_ID;
549 dev_dbg(kdev->dev, "rx flow(%d) (%p)\n", chan->flow, chan->reg_rx_flow);
550
551 return 0;
552 }
553
pktdma_init_tx_chan(struct knav_dma_chan * chan,u32 channel)554 static int pktdma_init_tx_chan(struct knav_dma_chan *chan, u32 channel)
555 {
556 struct knav_dma_device *dma = chan->dma;
557
558 chan->channel = channel;
559 chan->reg_chan = dma->reg_tx_chan + channel;
560 chan->reg_tx_sched = dma->reg_tx_sched + channel;
561 chan->flow = DMA_INVALID_ID;
562 dev_dbg(kdev->dev, "tx channel(%d) (%p)\n", chan->channel, chan->reg_chan);
563
564 return 0;
565 }
566
pktdma_init_chan(struct knav_dma_device * dma,enum dma_transfer_direction dir,unsigned chan_num)567 static int pktdma_init_chan(struct knav_dma_device *dma,
568 enum dma_transfer_direction dir,
569 unsigned chan_num)
570 {
571 struct device *dev = kdev->dev;
572 struct knav_dma_chan *chan;
573 int ret = -EINVAL;
574
575 chan = devm_kzalloc(dev, sizeof(*chan), GFP_KERNEL);
576 if (!chan)
577 return -ENOMEM;
578
579 INIT_LIST_HEAD(&chan->list);
580 chan->dma = dma;
581 chan->direction = DMA_TRANS_NONE;
582 atomic_set(&chan->ref_count, 0);
583 spin_lock_init(&chan->lock);
584
585 if (dir == DMA_MEM_TO_DEV) {
586 chan->direction = dir;
587 ret = pktdma_init_tx_chan(chan, chan_num);
588 } else if (dir == DMA_DEV_TO_MEM) {
589 chan->direction = dir;
590 ret = pktdma_init_rx_chan(chan, chan_num);
591 } else {
592 dev_err(dev, "channel(%d) direction unknown\n", chan_num);
593 }
594
595 list_add_tail(&chan->list, &dma->chan_list);
596
597 return ret;
598 }
599
dma_init(struct device_node * cloud,struct device_node * dma_node)600 static int dma_init(struct device_node *cloud, struct device_node *dma_node)
601 {
602 unsigned max_tx_chan, max_rx_chan, max_rx_flow, max_tx_sched;
603 struct device_node *node = dma_node;
604 struct knav_dma_device *dma;
605 int ret, num_chan = 0;
606 resource_size_t size;
607 u32 timeout;
608 u32 i;
609
610 dma = devm_kzalloc(kdev->dev, sizeof(*dma), GFP_KERNEL);
611 if (!dma) {
612 dev_err(kdev->dev, "could not allocate driver mem\n");
613 return -ENOMEM;
614 }
615 INIT_LIST_HEAD(&dma->list);
616 INIT_LIST_HEAD(&dma->chan_list);
617
618 ret = of_property_read_variable_u32_array(cloud, "ti,navigator-cloud-address",
619 dma->qm_base_address, 1, DMA_MAX_QMS);
620 if (ret < 0) {
621 dev_err(kdev->dev, "invalid navigator cloud addresses\n");
622 return -ENODEV;
623 }
624 dma->logical_queue_managers = ret;
625
626 dma->reg_global = pktdma_get_regs(dma, node, 0, &size);
627 if (IS_ERR(dma->reg_global))
628 return PTR_ERR(dma->reg_global);
629 if (size < sizeof(struct reg_global)) {
630 dev_err(kdev->dev, "bad size %pa for global regs\n", &size);
631 return -ENODEV;
632 }
633
634 dma->reg_tx_chan = pktdma_get_regs(dma, node, 1, &size);
635 if (IS_ERR(dma->reg_tx_chan))
636 return PTR_ERR(dma->reg_tx_chan);
637
638 max_tx_chan = size / sizeof(struct reg_chan);
639 dma->reg_rx_chan = pktdma_get_regs(dma, node, 2, &size);
640 if (IS_ERR(dma->reg_rx_chan))
641 return PTR_ERR(dma->reg_rx_chan);
642
643 max_rx_chan = size / sizeof(struct reg_chan);
644 dma->reg_tx_sched = pktdma_get_regs(dma, node, 3, &size);
645 if (IS_ERR(dma->reg_tx_sched))
646 return PTR_ERR(dma->reg_tx_sched);
647
648 max_tx_sched = size / sizeof(struct reg_tx_sched);
649 dma->reg_rx_flow = pktdma_get_regs(dma, node, 4, &size);
650 if (IS_ERR(dma->reg_rx_flow))
651 return PTR_ERR(dma->reg_rx_flow);
652
653 max_rx_flow = size / sizeof(struct reg_rx_flow);
654 dma->rx_priority = DMA_PRIO_DEFAULT;
655 dma->tx_priority = DMA_PRIO_DEFAULT;
656
657 dma->enable_all = of_property_read_bool(node, "ti,enable-all");
658 dma->loopback = of_property_read_bool(node, "ti,loop-back");
659
660 ret = of_property_read_u32(node, "ti,rx-retry-timeout", &timeout);
661 if (ret < 0) {
662 dev_dbg(kdev->dev, "unspecified rx timeout using value %d\n",
663 DMA_RX_TIMEOUT_DEFAULT);
664 timeout = DMA_RX_TIMEOUT_DEFAULT;
665 }
666
667 dma->rx_timeout = timeout;
668 dma->max_rx_chan = max_rx_chan;
669 dma->max_rx_flow = max_rx_flow;
670 dma->max_tx_chan = min(max_tx_chan, max_tx_sched);
671 atomic_set(&dma->ref_count, 0);
672 strcpy(dma->name, node->name);
673 spin_lock_init(&dma->lock);
674
675 for (i = 0; i < dma->max_tx_chan; i++) {
676 if (pktdma_init_chan(dma, DMA_MEM_TO_DEV, i) >= 0)
677 num_chan++;
678 }
679
680 for (i = 0; i < dma->max_rx_flow; i++) {
681 if (pktdma_init_chan(dma, DMA_DEV_TO_MEM, i) >= 0)
682 num_chan++;
683 }
684
685 list_add_tail(&dma->list, &kdev->list);
686
687 /*
688 * For DSP software usecases or userpace transport software, setup all
689 * the DMA hardware resources.
690 */
691 if (dma->enable_all) {
692 atomic_inc(&dma->ref_count);
693 knav_dma_hw_init(dma);
694 dma_hw_enable_all(dma);
695 }
696
697 dev_info(kdev->dev, "DMA %s registered %d logical channels, flows %d, tx chans: %d, rx chans: %d%s\n",
698 dma->name, num_chan, dma->max_rx_flow,
699 dma->max_tx_chan, dma->max_rx_chan,
700 dma->loopback ? ", loopback" : "");
701
702 return 0;
703 }
704
knav_dma_probe(struct platform_device * pdev)705 static int knav_dma_probe(struct platform_device *pdev)
706 {
707 struct device *dev = &pdev->dev;
708 struct device_node *node = pdev->dev.of_node;
709 struct device_node *child;
710 int ret = 0;
711
712 if (!node) {
713 dev_err(&pdev->dev, "could not find device info\n");
714 return -EINVAL;
715 }
716
717 kdev = devm_kzalloc(dev,
718 sizeof(struct knav_dma_pool_device), GFP_KERNEL);
719 if (!kdev) {
720 dev_err(dev, "could not allocate driver mem\n");
721 return -ENOMEM;
722 }
723
724 kdev->dev = dev;
725 INIT_LIST_HEAD(&kdev->list);
726
727 pm_runtime_enable(kdev->dev);
728 ret = pm_runtime_resume_and_get(kdev->dev);
729 if (ret < 0) {
730 dev_err(kdev->dev, "unable to enable pktdma, err %d\n", ret);
731 goto err_pm_disable;
732 }
733
734 /* Initialise all packet dmas */
735 for_each_child_of_node(node, child) {
736 ret = dma_init(node, child);
737 if (ret) {
738 of_node_put(child);
739 dev_err(&pdev->dev, "init failed with %d\n", ret);
740 break;
741 }
742 }
743
744 if (list_empty(&kdev->list)) {
745 dev_err(dev, "no valid dma instance\n");
746 ret = -ENODEV;
747 goto err_put_sync;
748 }
749
750 debugfs_create_file("knav_dma", S_IFREG | S_IRUGO, NULL, NULL,
751 &knav_dma_debug_fops);
752
753 device_ready = true;
754 return ret;
755
756 err_put_sync:
757 pm_runtime_put_sync(kdev->dev);
758 err_pm_disable:
759 pm_runtime_disable(kdev->dev);
760
761 return ret;
762 }
763
knav_dma_remove(struct platform_device * pdev)764 static void knav_dma_remove(struct platform_device *pdev)
765 {
766 struct knav_dma_device *dma;
767
768 list_for_each_entry(dma, &kdev->list, list) {
769 if (atomic_dec_return(&dma->ref_count) == 0)
770 knav_dma_hw_destroy(dma);
771 }
772
773 pm_runtime_put_sync(&pdev->dev);
774 pm_runtime_disable(&pdev->dev);
775 }
776
777 static struct of_device_id of_match[] = {
778 { .compatible = "ti,keystone-navigator-dma", },
779 {},
780 };
781
782 MODULE_DEVICE_TABLE(of, of_match);
783
784 static struct platform_driver knav_dma_driver = {
785 .probe = knav_dma_probe,
786 .remove_new = knav_dma_remove,
787 .driver = {
788 .name = "keystone-navigator-dma",
789 .of_match_table = of_match,
790 },
791 };
792 module_platform_driver(knav_dma_driver);
793
794 MODULE_LICENSE("GPL v2");
795 MODULE_DESCRIPTION("TI Keystone Navigator Packet DMA driver");
796 MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com>");
797 MODULE_AUTHOR("Santosh Shilimkar <santosh.shilimkar@ti.com>");
798