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
57struct 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
65struct reg_chan {
66 u32 control;
67 u32 mode;
68 u32 __rsvd[6];
69};
70
71struct reg_tx_sched {
72 u32 prio;
73};
74
75struct reg_rx_flow {
76 u32 control;
77 u32 tags;
78 u32 tag_sel;
79 u32 fdq_sel[2];
80 u32 thresh[3];
81};
82
83struct knav_dma_pool_device {
84 struct device *dev;
85 struct list_head list;
86};
87
88struct 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
107struct 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
127static struct knav_dma_pool_device *kdev;
128
129static bool device_ready;
130bool knav_dma_device_ready(void)
131{
132 return device_ready;
133}
134EXPORT_SYMBOL_GPL(knav_dma_device_ready);
135
136static bool check_config(struct knav_dma_chan *chan, struct knav_dma_cfg *cfg)
137{
138 if (!memcmp(p: &chan->cfg, q: cfg, size: sizeof(*cfg)))
139 return true;
140 else
141 return false;
142}
143
144static int chan_start(struct knav_dma_chan *chan,
145 struct knav_dma_cfg *cfg)
146{
147 u32 v = 0;
148
149 spin_lock(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(lock: &chan->lock);
198
199 return 0;
200}
201
202static 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
228static void chan_stop(struct knav_dma_chan *chan)
229{
230 spin_lock(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(lock: &chan->lock);
252
253 dev_dbg(kdev->dev, "channel stopped\n");
254}
255
256static 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
267static void knav_dma_hw_init(struct knav_dma_device *dma)
268{
269 unsigned v;
270 int i;
271
272 spin_lock(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(lock: &dma->lock);
293}
294
295static void knav_dma_hw_destroy(struct knav_dma_device *dma)
296{
297 int i;
298 unsigned v;
299
300 spin_lock(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(lock: &dma->lock);
309}
310
311static void dma_debug_show_channels(struct seq_file *s,
312 struct knav_dma_chan *chan)
313{
314 int i;
315
316 seq_printf(m: s, fmt: "\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(m: s, fmt: "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(m: s, fmt: "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(m: s, fmt: "\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(m: s, fmt: "[%d]", chan->cfg.u.rx.fdq[i]);
335 seq_printf(m: s, fmt: "\n");
336 }
337}
338
339static 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(v: &chan->ref_count))
346 dma_debug_show_channels(s, chan);
347 }
348}
349
350static 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(v: &dma->ref_count)) {
356 seq_printf(m: s, fmt: "%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
365DEFINE_SHOW_ATTRIBUTE(knav_dma_debug);
366
367static 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, phandle_name: "ti,navigator-dmas", index: 0);
375 if (!dma_node)
376 return -ENODEV;
377
378 *dma_instance = dma_node->name;
379 index = of_property_match_string(np, propname: "ti,navigator-dma-names", string: 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, list_name: "ti,navigator-dmas",
386 cell_count: 1, index, out_args: &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 */
407void *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(np: dev->of_node, name, dma_instance: &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(v: &chan->ref_count) >= 1) {
470 if (!check_config(chan, cfg: 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(v: &chan->dma->ref_count) <= 1)
478 knav_dma_hw_init(dma: chan->dma);
479
480 if (atomic_inc_return(v: &chan->ref_count) <= 1)
481 chan_start(chan, cfg: config);
482
483 dev_dbg(kdev->dev, "channel %d opened from DMA %s\n",
484 chan_num, instance);
485
486 return chan;
487}
488EXPORT_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 */
496void 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(v: &chan->ref_count) <= 0)
506 chan_stop(chan);
507
508 if (atomic_dec_return(v: &chan->dma->ref_count) <= 0)
509 knav_dma_hw_destroy(dma: 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}
514EXPORT_SYMBOL_GPL(knav_dma_close_channel);
515
516static 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(dev: node, index, r: &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(error: ret);
530 }
531
532 regs = devm_ioremap_resource(dev: kdev->dev, res: &res);
533 if (IS_ERR(ptr: 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: &res);
538
539 return regs;
540}
541
542static 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
554static 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
567static 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, size: sizeof(*chan), GFP_KERNEL);
576 if (!chan)
577 return -ENOMEM;
578
579 INIT_LIST_HEAD(list: &chan->list);
580 chan->dma = dma;
581 chan->direction = DMA_TRANS_NONE;
582 atomic_set(v: &chan->ref_count, i: 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, channel: chan_num);
588 } else if (dir == DMA_DEV_TO_MEM) {
589 chan->direction = dir;
590 ret = pktdma_init_rx_chan(chan, flow: chan_num);
591 } else {
592 dev_err(dev, "channel(%d) direction unknown\n", chan_num);
593 }
594
595 list_add_tail(new: &chan->list, head: &dma->chan_list);
596
597 return ret;
598}
599
600static 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, len, num_chan = 0;
606 resource_size_t size;
607 u32 timeout;
608 u32 i;
609
610 dma = devm_kzalloc(dev: kdev->dev, size: 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(list: &dma->list);
616 INIT_LIST_HEAD(list: &dma->chan_list);
617
618 if (!of_find_property(np: cloud, name: "ti,navigator-cloud-address", lenp: &len)) {
619 dev_err(kdev->dev, "unspecified navigator cloud addresses\n");
620 return -ENODEV;
621 }
622
623 dma->logical_queue_managers = len / sizeof(u32);
624 if (dma->logical_queue_managers > DMA_MAX_QMS) {
625 dev_warn(kdev->dev, "too many queue mgrs(>%d) rest ignored\n",
626 dma->logical_queue_managers);
627 dma->logical_queue_managers = DMA_MAX_QMS;
628 }
629
630 ret = of_property_read_u32_array(np: cloud, propname: "ti,navigator-cloud-address",
631 out_values: dma->qm_base_address,
632 sz: dma->logical_queue_managers);
633 if (ret) {
634 dev_err(kdev->dev, "invalid navigator cloud addresses\n");
635 return -ENODEV;
636 }
637
638 dma->reg_global = pktdma_get_regs(dma, node, index: 0, size: &size);
639 if (IS_ERR(ptr: dma->reg_global))
640 return PTR_ERR(ptr: dma->reg_global);
641 if (size < sizeof(struct reg_global)) {
642 dev_err(kdev->dev, "bad size %pa for global regs\n", &size);
643 return -ENODEV;
644 }
645
646 dma->reg_tx_chan = pktdma_get_regs(dma, node, index: 1, size: &size);
647 if (IS_ERR(ptr: dma->reg_tx_chan))
648 return PTR_ERR(ptr: dma->reg_tx_chan);
649
650 max_tx_chan = size / sizeof(struct reg_chan);
651 dma->reg_rx_chan = pktdma_get_regs(dma, node, index: 2, size: &size);
652 if (IS_ERR(ptr: dma->reg_rx_chan))
653 return PTR_ERR(ptr: dma->reg_rx_chan);
654
655 max_rx_chan = size / sizeof(struct reg_chan);
656 dma->reg_tx_sched = pktdma_get_regs(dma, node, index: 3, size: &size);
657 if (IS_ERR(ptr: dma->reg_tx_sched))
658 return PTR_ERR(ptr: dma->reg_tx_sched);
659
660 max_tx_sched = size / sizeof(struct reg_tx_sched);
661 dma->reg_rx_flow = pktdma_get_regs(dma, node, index: 4, size: &size);
662 if (IS_ERR(ptr: dma->reg_rx_flow))
663 return PTR_ERR(ptr: dma->reg_rx_flow);
664
665 max_rx_flow = size / sizeof(struct reg_rx_flow);
666 dma->rx_priority = DMA_PRIO_DEFAULT;
667 dma->tx_priority = DMA_PRIO_DEFAULT;
668
669 dma->enable_all = of_property_read_bool(np: node, propname: "ti,enable-all");
670 dma->loopback = of_property_read_bool(np: node, propname: "ti,loop-back");
671
672 ret = of_property_read_u32(np: node, propname: "ti,rx-retry-timeout", out_value: &timeout);
673 if (ret < 0) {
674 dev_dbg(kdev->dev, "unspecified rx timeout using value %d\n",
675 DMA_RX_TIMEOUT_DEFAULT);
676 timeout = DMA_RX_TIMEOUT_DEFAULT;
677 }
678
679 dma->rx_timeout = timeout;
680 dma->max_rx_chan = max_rx_chan;
681 dma->max_rx_flow = max_rx_flow;
682 dma->max_tx_chan = min(max_tx_chan, max_tx_sched);
683 atomic_set(v: &dma->ref_count, i: 0);
684 strcpy(p: dma->name, q: node->name);
685 spin_lock_init(&dma->lock);
686
687 for (i = 0; i < dma->max_tx_chan; i++) {
688 if (pktdma_init_chan(dma, dir: DMA_MEM_TO_DEV, chan_num: i) >= 0)
689 num_chan++;
690 }
691
692 for (i = 0; i < dma->max_rx_flow; i++) {
693 if (pktdma_init_chan(dma, dir: DMA_DEV_TO_MEM, chan_num: i) >= 0)
694 num_chan++;
695 }
696
697 list_add_tail(new: &dma->list, head: &kdev->list);
698
699 /*
700 * For DSP software usecases or userpace transport software, setup all
701 * the DMA hardware resources.
702 */
703 if (dma->enable_all) {
704 atomic_inc(v: &dma->ref_count);
705 knav_dma_hw_init(dma);
706 dma_hw_enable_all(dma);
707 }
708
709 dev_info(kdev->dev, "DMA %s registered %d logical channels, flows %d, tx chans: %d, rx chans: %d%s\n",
710 dma->name, num_chan, dma->max_rx_flow,
711 dma->max_tx_chan, dma->max_rx_chan,
712 dma->loopback ? ", loopback" : "");
713
714 return 0;
715}
716
717static int knav_dma_probe(struct platform_device *pdev)
718{
719 struct device *dev = &pdev->dev;
720 struct device_node *node = pdev->dev.of_node;
721 struct device_node *child;
722 int ret = 0;
723
724 if (!node) {
725 dev_err(&pdev->dev, "could not find device info\n");
726 return -EINVAL;
727 }
728
729 kdev = devm_kzalloc(dev,
730 size: sizeof(struct knav_dma_pool_device), GFP_KERNEL);
731 if (!kdev) {
732 dev_err(dev, "could not allocate driver mem\n");
733 return -ENOMEM;
734 }
735
736 kdev->dev = dev;
737 INIT_LIST_HEAD(list: &kdev->list);
738
739 pm_runtime_enable(dev: kdev->dev);
740 ret = pm_runtime_resume_and_get(dev: kdev->dev);
741 if (ret < 0) {
742 dev_err(kdev->dev, "unable to enable pktdma, err %d\n", ret);
743 goto err_pm_disable;
744 }
745
746 /* Initialise all packet dmas */
747 for_each_child_of_node(node, child) {
748 ret = dma_init(cloud: node, dma_node: child);
749 if (ret) {
750 of_node_put(node: child);
751 dev_err(&pdev->dev, "init failed with %d\n", ret);
752 break;
753 }
754 }
755
756 if (list_empty(head: &kdev->list)) {
757 dev_err(dev, "no valid dma instance\n");
758 ret = -ENODEV;
759 goto err_put_sync;
760 }
761
762 debugfs_create_file(name: "knav_dma", S_IFREG | S_IRUGO, NULL, NULL,
763 fops: &knav_dma_debug_fops);
764
765 device_ready = true;
766 return ret;
767
768err_put_sync:
769 pm_runtime_put_sync(dev: kdev->dev);
770err_pm_disable:
771 pm_runtime_disable(dev: kdev->dev);
772
773 return ret;
774}
775
776static void knav_dma_remove(struct platform_device *pdev)
777{
778 struct knav_dma_device *dma;
779
780 list_for_each_entry(dma, &kdev->list, list) {
781 if (atomic_dec_return(v: &dma->ref_count) == 0)
782 knav_dma_hw_destroy(dma);
783 }
784
785 pm_runtime_put_sync(dev: &pdev->dev);
786 pm_runtime_disable(dev: &pdev->dev);
787}
788
789static struct of_device_id of_match[] = {
790 { .compatible = "ti,keystone-navigator-dma", },
791 {},
792};
793
794MODULE_DEVICE_TABLE(of, of_match);
795
796static struct platform_driver knav_dma_driver = {
797 .probe = knav_dma_probe,
798 .remove_new = knav_dma_remove,
799 .driver = {
800 .name = "keystone-navigator-dma",
801 .of_match_table = of_match,
802 },
803};
804module_platform_driver(knav_dma_driver);
805
806MODULE_LICENSE("GPL v2");
807MODULE_DESCRIPTION("TI Keystone Navigator Packet DMA driver");
808MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com>");
809MODULE_AUTHOR("Santosh Shilimkar <santosh.shilimkar@ti.com>");
810

source code of linux/drivers/soc/ti/knav_dma.c