1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Keystone accumulator queue manager
4 *
5 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
6 * Author: Sandeep Nair <sandeep_n@ti.com>
7 * Cyril Chemparathy <cyril@ti.com>
8 * Santosh Shilimkar <santosh.shilimkar@ti.com>
9 */
10
11 #include <linux/dma-mapping.h>
12 #include <linux/io.h>
13 #include <linux/interrupt.h>
14 #include <linux/module.h>
15 #include <linux/of_address.h>
16 #include <linux/soc/ti/knav_qmss.h>
17
18 #include "knav_qmss.h"
19
20 #define knav_range_offset_to_inst(kdev, range, q) \
21 (range->queue_base_inst + (q << kdev->inst_shift))
22
__knav_acc_notify(struct knav_range_info * range,struct knav_acc_channel * acc)23 static void __knav_acc_notify(struct knav_range_info *range,
24 struct knav_acc_channel *acc)
25 {
26 struct knav_device *kdev = range->kdev;
27 struct knav_queue_inst *inst;
28 int range_base, queue;
29
30 range_base = kdev->base_id + range->queue_base;
31
32 if (range->flags & RANGE_MULTI_QUEUE) {
33 for (queue = 0; queue < range->num_queues; queue++) {
34 inst = knav_range_offset_to_inst(kdev, range,
35 queue);
36 if (inst->notify_needed) {
37 inst->notify_needed = 0;
38 dev_dbg(kdev->dev, "acc-irq: notifying %d\n",
39 range_base + queue);
40 knav_queue_notify(inst);
41 }
42 }
43 } else {
44 queue = acc->channel - range->acc_info.start_channel;
45 inst = knav_range_offset_to_inst(kdev, range, queue);
46 dev_dbg(kdev->dev, "acc-irq: notifying %d\n",
47 range_base + queue);
48 knav_queue_notify(inst);
49 }
50 }
51
knav_acc_set_notify(struct knav_range_info * range,struct knav_queue_inst * kq,bool enabled)52 static int knav_acc_set_notify(struct knav_range_info *range,
53 struct knav_queue_inst *kq,
54 bool enabled)
55 {
56 struct knav_pdsp_info *pdsp = range->acc_info.pdsp;
57 struct knav_device *kdev = range->kdev;
58 u32 mask, offset;
59
60 /*
61 * when enabling, we need to re-trigger an interrupt if we
62 * have descriptors pending
63 */
64 if (!enabled || atomic_read(&kq->desc_count) <= 0)
65 return 0;
66
67 kq->notify_needed = 1;
68 atomic_inc(&kq->acc->retrigger_count);
69 mask = BIT(kq->acc->channel % 32);
70 offset = ACC_INTD_OFFSET_STATUS(kq->acc->channel);
71 dev_dbg(kdev->dev, "setup-notify: re-triggering irq for %s\n",
72 kq->acc->name);
73 writel_relaxed(mask, pdsp->intd + offset);
74 return 0;
75 }
76
knav_acc_int_handler(int irq,void * _instdata)77 static irqreturn_t knav_acc_int_handler(int irq, void *_instdata)
78 {
79 struct knav_acc_channel *acc;
80 struct knav_queue_inst *kq = NULL;
81 struct knav_range_info *range;
82 struct knav_pdsp_info *pdsp;
83 struct knav_acc_info *info;
84 struct knav_device *kdev;
85
86 u32 *list, *list_cpu, val, idx, notifies;
87 int range_base, channel, queue = 0;
88 dma_addr_t list_dma;
89
90 range = _instdata;
91 info = &range->acc_info;
92 kdev = range->kdev;
93 pdsp = range->acc_info.pdsp;
94 acc = range->acc;
95
96 range_base = kdev->base_id + range->queue_base;
97 if ((range->flags & RANGE_MULTI_QUEUE) == 0) {
98 for (queue = 0; queue < range->num_irqs; queue++)
99 if (range->irqs[queue].irq == irq)
100 break;
101 kq = knav_range_offset_to_inst(kdev, range, queue);
102 acc += queue;
103 }
104
105 channel = acc->channel;
106 list_dma = acc->list_dma[acc->list_index];
107 list_cpu = acc->list_cpu[acc->list_index];
108 dev_dbg(kdev->dev, "acc-irq: channel %d, list %d, virt %p, dma %pad\n",
109 channel, acc->list_index, list_cpu, &list_dma);
110 if (atomic_read(&acc->retrigger_count)) {
111 atomic_dec(&acc->retrigger_count);
112 __knav_acc_notify(range, acc);
113 writel_relaxed(1, pdsp->intd + ACC_INTD_OFFSET_COUNT(channel));
114 /* ack the interrupt */
115 writel_relaxed(ACC_CHANNEL_INT_BASE + channel,
116 pdsp->intd + ACC_INTD_OFFSET_EOI);
117
118 return IRQ_HANDLED;
119 }
120
121 notifies = readl_relaxed(pdsp->intd + ACC_INTD_OFFSET_COUNT(channel));
122 WARN_ON(!notifies);
123 dma_sync_single_for_cpu(kdev->dev, list_dma, info->list_size,
124 DMA_FROM_DEVICE);
125
126 for (list = list_cpu; list < list_cpu + (info->list_size / sizeof(u32));
127 list += ACC_LIST_ENTRY_WORDS) {
128 if (ACC_LIST_ENTRY_WORDS == 1) {
129 dev_dbg(kdev->dev,
130 "acc-irq: list %d, entry @%p, %08x\n",
131 acc->list_index, list, list[0]);
132 } else if (ACC_LIST_ENTRY_WORDS == 2) {
133 dev_dbg(kdev->dev,
134 "acc-irq: list %d, entry @%p, %08x %08x\n",
135 acc->list_index, list, list[0], list[1]);
136 } else if (ACC_LIST_ENTRY_WORDS == 4) {
137 dev_dbg(kdev->dev,
138 "acc-irq: list %d, entry @%p, %08x %08x %08x %08x\n",
139 acc->list_index, list, list[0], list[1],
140 list[2], list[3]);
141 }
142
143 val = list[ACC_LIST_ENTRY_DESC_IDX];
144 if (!val)
145 break;
146
147 if (range->flags & RANGE_MULTI_QUEUE) {
148 queue = list[ACC_LIST_ENTRY_QUEUE_IDX] >> 16;
149 if (queue < range_base ||
150 queue >= range_base + range->num_queues) {
151 dev_err(kdev->dev,
152 "bad queue %d, expecting %d-%d\n",
153 queue, range_base,
154 range_base + range->num_queues);
155 break;
156 }
157 queue -= range_base;
158 kq = knav_range_offset_to_inst(kdev, range,
159 queue);
160 }
161
162 if (atomic_inc_return(&kq->desc_count) >= ACC_DESCS_MAX) {
163 atomic_dec(&kq->desc_count);
164 dev_err(kdev->dev,
165 "acc-irq: queue %d full, entry dropped\n",
166 queue + range_base);
167 continue;
168 }
169
170 idx = atomic_inc_return(&kq->desc_tail) & ACC_DESCS_MASK;
171 kq->descs[idx] = val;
172 kq->notify_needed = 1;
173 dev_dbg(kdev->dev, "acc-irq: enqueue %08x at %d, queue %d\n",
174 val, idx, queue + range_base);
175 }
176
177 __knav_acc_notify(range, acc);
178 memset(list_cpu, 0, info->list_size);
179 dma_sync_single_for_device(kdev->dev, list_dma, info->list_size,
180 DMA_TO_DEVICE);
181
182 /* flip to the other list */
183 acc->list_index ^= 1;
184
185 /* reset the interrupt counter */
186 writel_relaxed(1, pdsp->intd + ACC_INTD_OFFSET_COUNT(channel));
187
188 /* ack the interrupt */
189 writel_relaxed(ACC_CHANNEL_INT_BASE + channel,
190 pdsp->intd + ACC_INTD_OFFSET_EOI);
191
192 return IRQ_HANDLED;
193 }
194
knav_range_setup_acc_irq(struct knav_range_info * range,int queue,bool enabled)195 static int knav_range_setup_acc_irq(struct knav_range_info *range,
196 int queue, bool enabled)
197 {
198 struct knav_device *kdev = range->kdev;
199 struct knav_acc_channel *acc;
200 struct cpumask *cpu_mask;
201 int ret = 0, irq;
202 u32 old, new;
203
204 if (range->flags & RANGE_MULTI_QUEUE) {
205 acc = range->acc;
206 irq = range->irqs[0].irq;
207 cpu_mask = range->irqs[0].cpu_mask;
208 } else {
209 acc = range->acc + queue;
210 irq = range->irqs[queue].irq;
211 cpu_mask = range->irqs[queue].cpu_mask;
212 }
213
214 old = acc->open_mask;
215 if (enabled)
216 new = old | BIT(queue);
217 else
218 new = old & ~BIT(queue);
219 acc->open_mask = new;
220
221 dev_dbg(kdev->dev,
222 "setup-acc-irq: open mask old %08x, new %08x, channel %s\n",
223 old, new, acc->name);
224
225 if (likely(new == old))
226 return 0;
227
228 if (new && !old) {
229 dev_dbg(kdev->dev,
230 "setup-acc-irq: requesting %s for channel %s\n",
231 acc->name, acc->name);
232 ret = request_irq(irq, knav_acc_int_handler, 0, acc->name,
233 range);
234 if (!ret && cpu_mask) {
235 ret = irq_set_affinity_hint(irq, cpu_mask);
236 if (ret) {
237 dev_warn(range->kdev->dev,
238 "Failed to set IRQ affinity\n");
239 return ret;
240 }
241 }
242 }
243
244 if (old && !new) {
245 dev_dbg(kdev->dev, "setup-acc-irq: freeing %s for channel %s\n",
246 acc->name, acc->name);
247 ret = irq_set_affinity_hint(irq, NULL);
248 if (ret)
249 dev_warn(range->kdev->dev,
250 "Failed to set IRQ affinity\n");
251 free_irq(irq, range);
252 }
253
254 return ret;
255 }
256
knav_acc_result_str(enum knav_acc_result result)257 static const char *knav_acc_result_str(enum knav_acc_result result)
258 {
259 static const char * const result_str[] = {
260 [ACC_RET_IDLE] = "idle",
261 [ACC_RET_SUCCESS] = "success",
262 [ACC_RET_INVALID_COMMAND] = "invalid command",
263 [ACC_RET_INVALID_CHANNEL] = "invalid channel",
264 [ACC_RET_INACTIVE_CHANNEL] = "inactive channel",
265 [ACC_RET_ACTIVE_CHANNEL] = "active channel",
266 [ACC_RET_INVALID_QUEUE] = "invalid queue",
267 [ACC_RET_INVALID_RET] = "invalid return code",
268 };
269
270 if (result >= ARRAY_SIZE(result_str))
271 return result_str[ACC_RET_INVALID_RET];
272 else
273 return result_str[result];
274 }
275
276 static enum knav_acc_result
knav_acc_write(struct knav_device * kdev,struct knav_pdsp_info * pdsp,struct knav_reg_acc_command * cmd)277 knav_acc_write(struct knav_device *kdev, struct knav_pdsp_info *pdsp,
278 struct knav_reg_acc_command *cmd)
279 {
280 u32 result;
281
282 dev_dbg(kdev->dev, "acc command %08x %08x %08x %08x %08x\n",
283 cmd->command, cmd->queue_mask, cmd->list_dma,
284 cmd->queue_num, cmd->timer_config);
285
286 writel_relaxed(cmd->timer_config, &pdsp->acc_command->timer_config);
287 writel_relaxed(cmd->queue_num, &pdsp->acc_command->queue_num);
288 writel_relaxed(cmd->list_dma, &pdsp->acc_command->list_dma);
289 writel_relaxed(cmd->queue_mask, &pdsp->acc_command->queue_mask);
290 writel_relaxed(cmd->command, &pdsp->acc_command->command);
291
292 /* wait for the command to clear */
293 do {
294 result = readl_relaxed(&pdsp->acc_command->command);
295 } while ((result >> 8) & 0xff);
296
297 return (result >> 24) & 0xff;
298 }
299
knav_acc_setup_cmd(struct knav_device * kdev,struct knav_range_info * range,struct knav_reg_acc_command * cmd,int queue)300 static void knav_acc_setup_cmd(struct knav_device *kdev,
301 struct knav_range_info *range,
302 struct knav_reg_acc_command *cmd,
303 int queue)
304 {
305 struct knav_acc_info *info = &range->acc_info;
306 struct knav_acc_channel *acc;
307 int queue_base;
308 u32 queue_mask;
309
310 if (range->flags & RANGE_MULTI_QUEUE) {
311 acc = range->acc;
312 queue_base = range->queue_base;
313 queue_mask = BIT(range->num_queues) - 1;
314 } else {
315 acc = range->acc + queue;
316 queue_base = range->queue_base + queue;
317 queue_mask = 0;
318 }
319
320 memset(cmd, 0, sizeof(*cmd));
321 cmd->command = acc->channel;
322 cmd->queue_mask = queue_mask;
323 cmd->list_dma = (u32)acc->list_dma[0];
324 cmd->queue_num = info->list_entries << 16;
325 cmd->queue_num |= queue_base;
326
327 cmd->timer_config = ACC_LIST_ENTRY_TYPE << 18;
328 if (range->flags & RANGE_MULTI_QUEUE)
329 cmd->timer_config |= ACC_CFG_MULTI_QUEUE;
330 cmd->timer_config |= info->pacing_mode << 16;
331 cmd->timer_config |= info->timer_count;
332 }
333
knav_acc_stop(struct knav_device * kdev,struct knav_range_info * range,int queue)334 static void knav_acc_stop(struct knav_device *kdev,
335 struct knav_range_info *range,
336 int queue)
337 {
338 struct knav_reg_acc_command cmd;
339 struct knav_acc_channel *acc;
340 enum knav_acc_result result;
341
342 acc = range->acc + queue;
343
344 knav_acc_setup_cmd(kdev, range, &cmd, queue);
345 cmd.command |= ACC_CMD_DISABLE_CHANNEL << 8;
346 result = knav_acc_write(kdev, range->acc_info.pdsp, &cmd);
347
348 dev_dbg(kdev->dev, "stopped acc channel %s, result %s\n",
349 acc->name, knav_acc_result_str(result));
350 }
351
knav_acc_start(struct knav_device * kdev,struct knav_range_info * range,int queue)352 static enum knav_acc_result knav_acc_start(struct knav_device *kdev,
353 struct knav_range_info *range,
354 int queue)
355 {
356 struct knav_reg_acc_command cmd;
357 struct knav_acc_channel *acc;
358 enum knav_acc_result result;
359
360 acc = range->acc + queue;
361
362 knav_acc_setup_cmd(kdev, range, &cmd, queue);
363 cmd.command |= ACC_CMD_ENABLE_CHANNEL << 8;
364 result = knav_acc_write(kdev, range->acc_info.pdsp, &cmd);
365
366 dev_dbg(kdev->dev, "started acc channel %s, result %s\n",
367 acc->name, knav_acc_result_str(result));
368
369 return result;
370 }
371
knav_acc_init_range(struct knav_range_info * range)372 static int knav_acc_init_range(struct knav_range_info *range)
373 {
374 struct knav_device *kdev = range->kdev;
375 struct knav_acc_channel *acc;
376 enum knav_acc_result result;
377 int queue;
378
379 for (queue = 0; queue < range->num_queues; queue++) {
380 acc = range->acc + queue;
381
382 knav_acc_stop(kdev, range, queue);
383 acc->list_index = 0;
384 result = knav_acc_start(kdev, range, queue);
385
386 if (result != ACC_RET_SUCCESS)
387 return -EIO;
388
389 if (range->flags & RANGE_MULTI_QUEUE)
390 return 0;
391 }
392 return 0;
393 }
394
knav_acc_init_queue(struct knav_range_info * range,struct knav_queue_inst * kq)395 static int knav_acc_init_queue(struct knav_range_info *range,
396 struct knav_queue_inst *kq)
397 {
398 unsigned id = kq->id - range->queue_base;
399
400 kq->descs = devm_kcalloc(range->kdev->dev,
401 ACC_DESCS_MAX, sizeof(u32), GFP_KERNEL);
402 if (!kq->descs)
403 return -ENOMEM;
404
405 kq->acc = range->acc;
406 if ((range->flags & RANGE_MULTI_QUEUE) == 0)
407 kq->acc += id;
408 return 0;
409 }
410
knav_acc_open_queue(struct knav_range_info * range,struct knav_queue_inst * inst,unsigned flags)411 static int knav_acc_open_queue(struct knav_range_info *range,
412 struct knav_queue_inst *inst, unsigned flags)
413 {
414 unsigned id = inst->id - range->queue_base;
415
416 return knav_range_setup_acc_irq(range, id, true);
417 }
418
knav_acc_close_queue(struct knav_range_info * range,struct knav_queue_inst * inst)419 static int knav_acc_close_queue(struct knav_range_info *range,
420 struct knav_queue_inst *inst)
421 {
422 unsigned id = inst->id - range->queue_base;
423
424 return knav_range_setup_acc_irq(range, id, false);
425 }
426
knav_acc_free_range(struct knav_range_info * range)427 static int knav_acc_free_range(struct knav_range_info *range)
428 {
429 struct knav_device *kdev = range->kdev;
430 struct knav_acc_channel *acc;
431 struct knav_acc_info *info;
432 int channel, channels;
433
434 info = &range->acc_info;
435
436 if (range->flags & RANGE_MULTI_QUEUE)
437 channels = 1;
438 else
439 channels = range->num_queues;
440
441 for (channel = 0; channel < channels; channel++) {
442 acc = range->acc + channel;
443 if (!acc->list_cpu[0])
444 continue;
445 dma_unmap_single(kdev->dev, acc->list_dma[0],
446 info->mem_size, DMA_BIDIRECTIONAL);
447 free_pages_exact(acc->list_cpu[0], info->mem_size);
448 }
449 devm_kfree(range->kdev->dev, range->acc);
450 return 0;
451 }
452
453 static struct knav_range_ops knav_acc_range_ops = {
454 .set_notify = knav_acc_set_notify,
455 .init_queue = knav_acc_init_queue,
456 .open_queue = knav_acc_open_queue,
457 .close_queue = knav_acc_close_queue,
458 .init_range = knav_acc_init_range,
459 .free_range = knav_acc_free_range,
460 };
461
462 /**
463 * knav_init_acc_range: Initialise accumulator ranges
464 *
465 * @kdev: qmss device
466 * @node: device node
467 * @range: qmms range information
468 *
469 * Return 0 on success or error
470 */
knav_init_acc_range(struct knav_device * kdev,struct device_node * node,struct knav_range_info * range)471 int knav_init_acc_range(struct knav_device *kdev,
472 struct device_node *node,
473 struct knav_range_info *range)
474 {
475 struct knav_acc_channel *acc;
476 struct knav_pdsp_info *pdsp;
477 struct knav_acc_info *info;
478 int ret, channel, channels;
479 int list_size, mem_size;
480 dma_addr_t list_dma;
481 void *list_mem;
482 u32 config[5];
483
484 range->flags |= RANGE_HAS_ACCUMULATOR;
485 info = &range->acc_info;
486
487 ret = of_property_read_u32_array(node, "accumulator", config, 5);
488 if (ret)
489 return ret;
490
491 info->pdsp_id = config[0];
492 info->start_channel = config[1];
493 info->list_entries = config[2];
494 info->pacing_mode = config[3];
495 info->timer_count = config[4] / ACC_DEFAULT_PERIOD;
496
497 if (info->start_channel > ACC_MAX_CHANNEL) {
498 dev_err(kdev->dev, "channel %d invalid for range %s\n",
499 info->start_channel, range->name);
500 return -EINVAL;
501 }
502
503 if (info->pacing_mode > 3) {
504 dev_err(kdev->dev, "pacing mode %d invalid for range %s\n",
505 info->pacing_mode, range->name);
506 return -EINVAL;
507 }
508
509 pdsp = knav_find_pdsp(kdev, info->pdsp_id);
510 if (!pdsp) {
511 dev_err(kdev->dev, "pdsp id %d not found for range %s\n",
512 info->pdsp_id, range->name);
513 return -EINVAL;
514 }
515
516 if (!pdsp->started) {
517 dev_err(kdev->dev, "pdsp id %d not started for range %s\n",
518 info->pdsp_id, range->name);
519 return -ENODEV;
520 }
521
522 info->pdsp = pdsp;
523 channels = range->num_queues;
524 if (of_property_read_bool(node, "multi-queue")) {
525 range->flags |= RANGE_MULTI_QUEUE;
526 channels = 1;
527 if (range->queue_base & (32 - 1)) {
528 dev_err(kdev->dev,
529 "misaligned multi-queue accumulator range %s\n",
530 range->name);
531 return -EINVAL;
532 }
533 if (range->num_queues > 32) {
534 dev_err(kdev->dev,
535 "too many queues in accumulator range %s\n",
536 range->name);
537 return -EINVAL;
538 }
539 }
540
541 /* figure out list size */
542 list_size = info->list_entries;
543 list_size *= ACC_LIST_ENTRY_WORDS * sizeof(u32);
544 info->list_size = list_size;
545 mem_size = PAGE_ALIGN(list_size * 2);
546 info->mem_size = mem_size;
547 range->acc = devm_kcalloc(kdev->dev, channels, sizeof(*range->acc),
548 GFP_KERNEL);
549 if (!range->acc)
550 return -ENOMEM;
551
552 for (channel = 0; channel < channels; channel++) {
553 acc = range->acc + channel;
554 acc->channel = info->start_channel + channel;
555
556 /* allocate memory for the two lists */
557 list_mem = alloc_pages_exact(mem_size, GFP_KERNEL | GFP_DMA);
558 if (!list_mem)
559 return -ENOMEM;
560
561 list_dma = dma_map_single(kdev->dev, list_mem, mem_size,
562 DMA_BIDIRECTIONAL);
563 if (dma_mapping_error(kdev->dev, list_dma)) {
564 free_pages_exact(list_mem, mem_size);
565 return -ENOMEM;
566 }
567
568 memset(list_mem, 0, mem_size);
569 dma_sync_single_for_device(kdev->dev, list_dma, mem_size,
570 DMA_TO_DEVICE);
571 scnprintf(acc->name, sizeof(acc->name), "hwqueue-acc-%d",
572 acc->channel);
573 acc->list_cpu[0] = list_mem;
574 acc->list_cpu[1] = list_mem + list_size;
575 acc->list_dma[0] = list_dma;
576 acc->list_dma[1] = list_dma + list_size;
577 dev_dbg(kdev->dev, "%s: channel %d, dma %pad, virt %8p\n",
578 acc->name, acc->channel, &list_dma, list_mem);
579 }
580
581 range->ops = &knav_acc_range_ops;
582 return 0;
583 }
584 EXPORT_SYMBOL_GPL(knav_init_acc_range);
585