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41f93af9 SN |
1 | /* |
2 | * Keystone accumulator queue manager | |
3 | * | |
4 | * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com | |
5 | * Author: Sandeep Nair <sandeep_n@ti.com> | |
6 | * Cyril Chemparathy <cyril@ti.com> | |
7 | * Santosh Shilimkar <santosh.shilimkar@ti.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | */ | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/io.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/bitops.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/soc/ti/knav_qmss.h> | |
28 | #include <linux/platform_device.h> | |
29 | #include <linux/dma-mapping.h> | |
30 | #include <linux/of.h> | |
31 | #include <linux/of_device.h> | |
32 | #include <linux/of_address.h> | |
33 | #include <linux/firmware.h> | |
34 | ||
35 | #include "knav_qmss.h" | |
36 | ||
37 | #define knav_range_offset_to_inst(kdev, range, q) \ | |
38 | (range->queue_base_inst + (q << kdev->inst_shift)) | |
39 | ||
40 | static void __knav_acc_notify(struct knav_range_info *range, | |
41 | struct knav_acc_channel *acc) | |
42 | { | |
43 | struct knav_device *kdev = range->kdev; | |
44 | struct knav_queue_inst *inst; | |
45 | int range_base, queue; | |
46 | ||
47 | range_base = kdev->base_id + range->queue_base; | |
48 | ||
49 | if (range->flags & RANGE_MULTI_QUEUE) { | |
50 | for (queue = 0; queue < range->num_queues; queue++) { | |
51 | inst = knav_range_offset_to_inst(kdev, range, | |
52 | queue); | |
53 | if (inst->notify_needed) { | |
54 | inst->notify_needed = 0; | |
55 | dev_dbg(kdev->dev, "acc-irq: notifying %d\n", | |
56 | range_base + queue); | |
57 | knav_queue_notify(inst); | |
58 | } | |
59 | } | |
60 | } else { | |
61 | queue = acc->channel - range->acc_info.start_channel; | |
62 | inst = knav_range_offset_to_inst(kdev, range, queue); | |
63 | dev_dbg(kdev->dev, "acc-irq: notifying %d\n", | |
64 | range_base + queue); | |
65 | knav_queue_notify(inst); | |
66 | } | |
67 | } | |
68 | ||
69 | static int knav_acc_set_notify(struct knav_range_info *range, | |
70 | struct knav_queue_inst *kq, | |
71 | bool enabled) | |
72 | { | |
73 | struct knav_pdsp_info *pdsp = range->acc_info.pdsp; | |
74 | struct knav_device *kdev = range->kdev; | |
75 | u32 mask, offset; | |
76 | ||
77 | /* | |
78 | * when enabling, we need to re-trigger an interrupt if we | |
79 | * have descriptors pending | |
80 | */ | |
81 | if (!enabled || atomic_read(&kq->desc_count) <= 0) | |
82 | return 0; | |
83 | ||
84 | kq->notify_needed = 1; | |
85 | atomic_inc(&kq->acc->retrigger_count); | |
86 | mask = BIT(kq->acc->channel % 32); | |
87 | offset = ACC_INTD_OFFSET_STATUS(kq->acc->channel); | |
88 | dev_dbg(kdev->dev, "setup-notify: re-triggering irq for %s\n", | |
89 | kq->acc->name); | |
90 | writel_relaxed(mask, pdsp->intd + offset); | |
91 | return 0; | |
92 | } | |
93 | ||
94 | static irqreturn_t knav_acc_int_handler(int irq, void *_instdata) | |
95 | { | |
96 | struct knav_acc_channel *acc; | |
97 | struct knav_queue_inst *kq = NULL; | |
98 | struct knav_range_info *range; | |
99 | struct knav_pdsp_info *pdsp; | |
100 | struct knav_acc_info *info; | |
101 | struct knav_device *kdev; | |
102 | ||
103 | u32 *list, *list_cpu, val, idx, notifies; | |
104 | int range_base, channel, queue = 0; | |
105 | dma_addr_t list_dma; | |
106 | ||
107 | range = _instdata; | |
108 | info = &range->acc_info; | |
109 | kdev = range->kdev; | |
110 | pdsp = range->acc_info.pdsp; | |
111 | acc = range->acc; | |
112 | ||
113 | range_base = kdev->base_id + range->queue_base; | |
114 | if ((range->flags & RANGE_MULTI_QUEUE) == 0) { | |
115 | for (queue = 0; queue < range->num_irqs; queue++) | |
116 | if (range->irqs[queue].irq == irq) | |
117 | break; | |
118 | kq = knav_range_offset_to_inst(kdev, range, queue); | |
119 | acc += queue; | |
120 | } | |
121 | ||
122 | channel = acc->channel; | |
123 | list_dma = acc->list_dma[acc->list_index]; | |
124 | list_cpu = acc->list_cpu[acc->list_index]; | |
125 | dev_dbg(kdev->dev, "acc-irq: channel %d, list %d, virt %p, phys %x\n", | |
126 | channel, acc->list_index, list_cpu, list_dma); | |
127 | if (atomic_read(&acc->retrigger_count)) { | |
128 | atomic_dec(&acc->retrigger_count); | |
129 | __knav_acc_notify(range, acc); | |
130 | writel_relaxed(1, pdsp->intd + ACC_INTD_OFFSET_COUNT(channel)); | |
131 | /* ack the interrupt */ | |
132 | writel_relaxed(ACC_CHANNEL_INT_BASE + channel, | |
133 | pdsp->intd + ACC_INTD_OFFSET_EOI); | |
134 | ||
135 | return IRQ_HANDLED; | |
136 | } | |
137 | ||
138 | notifies = readl_relaxed(pdsp->intd + ACC_INTD_OFFSET_COUNT(channel)); | |
139 | WARN_ON(!notifies); | |
140 | dma_sync_single_for_cpu(kdev->dev, list_dma, info->list_size, | |
141 | DMA_FROM_DEVICE); | |
142 | ||
143 | for (list = list_cpu; list < list_cpu + (info->list_size / sizeof(u32)); | |
144 | list += ACC_LIST_ENTRY_WORDS) { | |
145 | if (ACC_LIST_ENTRY_WORDS == 1) { | |
146 | dev_dbg(kdev->dev, | |
147 | "acc-irq: list %d, entry @%p, %08x\n", | |
148 | acc->list_index, list, list[0]); | |
149 | } else if (ACC_LIST_ENTRY_WORDS == 2) { | |
150 | dev_dbg(kdev->dev, | |
151 | "acc-irq: list %d, entry @%p, %08x %08x\n", | |
152 | acc->list_index, list, list[0], list[1]); | |
153 | } else if (ACC_LIST_ENTRY_WORDS == 4) { | |
154 | dev_dbg(kdev->dev, | |
155 | "acc-irq: list %d, entry @%p, %08x %08x %08x %08x\n", | |
156 | acc->list_index, list, list[0], list[1], | |
157 | list[2], list[3]); | |
158 | } | |
159 | ||
160 | val = list[ACC_LIST_ENTRY_DESC_IDX]; | |
161 | if (!val) | |
162 | break; | |
163 | ||
164 | if (range->flags & RANGE_MULTI_QUEUE) { | |
165 | queue = list[ACC_LIST_ENTRY_QUEUE_IDX] >> 16; | |
166 | if (queue < range_base || | |
167 | queue >= range_base + range->num_queues) { | |
168 | dev_err(kdev->dev, | |
169 | "bad queue %d, expecting %d-%d\n", | |
170 | queue, range_base, | |
171 | range_base + range->num_queues); | |
172 | break; | |
173 | } | |
174 | queue -= range_base; | |
175 | kq = knav_range_offset_to_inst(kdev, range, | |
176 | queue); | |
177 | } | |
178 | ||
179 | if (atomic_inc_return(&kq->desc_count) >= ACC_DESCS_MAX) { | |
180 | atomic_dec(&kq->desc_count); | |
181 | dev_err(kdev->dev, | |
182 | "acc-irq: queue %d full, entry dropped\n", | |
183 | queue + range_base); | |
184 | continue; | |
185 | } | |
186 | ||
187 | idx = atomic_inc_return(&kq->desc_tail) & ACC_DESCS_MASK; | |
188 | kq->descs[idx] = val; | |
189 | kq->notify_needed = 1; | |
190 | dev_dbg(kdev->dev, "acc-irq: enqueue %08x at %d, queue %d\n", | |
191 | val, idx, queue + range_base); | |
192 | } | |
193 | ||
194 | __knav_acc_notify(range, acc); | |
195 | memset(list_cpu, 0, info->list_size); | |
196 | dma_sync_single_for_device(kdev->dev, list_dma, info->list_size, | |
197 | DMA_TO_DEVICE); | |
198 | ||
199 | /* flip to the other list */ | |
200 | acc->list_index ^= 1; | |
201 | ||
202 | /* reset the interrupt counter */ | |
203 | writel_relaxed(1, pdsp->intd + ACC_INTD_OFFSET_COUNT(channel)); | |
204 | ||
205 | /* ack the interrupt */ | |
206 | writel_relaxed(ACC_CHANNEL_INT_BASE + channel, | |
207 | pdsp->intd + ACC_INTD_OFFSET_EOI); | |
208 | ||
209 | return IRQ_HANDLED; | |
210 | } | |
211 | ||
a68094c6 | 212 | static int knav_range_setup_acc_irq(struct knav_range_info *range, |
41f93af9 SN |
213 | int queue, bool enabled) |
214 | { | |
215 | struct knav_device *kdev = range->kdev; | |
216 | struct knav_acc_channel *acc; | |
217 | unsigned long cpu_map; | |
218 | int ret = 0, irq; | |
219 | u32 old, new; | |
220 | ||
221 | if (range->flags & RANGE_MULTI_QUEUE) { | |
222 | acc = range->acc; | |
223 | irq = range->irqs[0].irq; | |
224 | cpu_map = range->irqs[0].cpu_map; | |
225 | } else { | |
226 | acc = range->acc + queue; | |
227 | irq = range->irqs[queue].irq; | |
228 | cpu_map = range->irqs[queue].cpu_map; | |
229 | } | |
230 | ||
231 | old = acc->open_mask; | |
232 | if (enabled) | |
233 | new = old | BIT(queue); | |
234 | else | |
235 | new = old & ~BIT(queue); | |
236 | acc->open_mask = new; | |
237 | ||
238 | dev_dbg(kdev->dev, | |
239 | "setup-acc-irq: open mask old %08x, new %08x, channel %s\n", | |
240 | old, new, acc->name); | |
241 | ||
242 | if (likely(new == old)) | |
243 | return 0; | |
244 | ||
245 | if (new && !old) { | |
246 | dev_dbg(kdev->dev, | |
247 | "setup-acc-irq: requesting %s for channel %s\n", | |
248 | acc->name, acc->name); | |
249 | ret = request_irq(irq, knav_acc_int_handler, 0, acc->name, | |
250 | range); | |
251 | if (!ret && cpu_map) { | |
252 | ret = irq_set_affinity_hint(irq, to_cpumask(&cpu_map)); | |
253 | if (ret) { | |
254 | dev_warn(range->kdev->dev, | |
255 | "Failed to set IRQ affinity\n"); | |
256 | return ret; | |
257 | } | |
258 | } | |
259 | } | |
260 | ||
261 | if (old && !new) { | |
262 | dev_dbg(kdev->dev, "setup-acc-irq: freeing %s for channel %s\n", | |
263 | acc->name, acc->name); | |
264 | free_irq(irq, range); | |
265 | } | |
266 | ||
267 | return ret; | |
268 | } | |
269 | ||
270 | static const char *knav_acc_result_str(enum knav_acc_result result) | |
271 | { | |
272 | static const char * const result_str[] = { | |
273 | [ACC_RET_IDLE] = "idle", | |
274 | [ACC_RET_SUCCESS] = "success", | |
275 | [ACC_RET_INVALID_COMMAND] = "invalid command", | |
276 | [ACC_RET_INVALID_CHANNEL] = "invalid channel", | |
277 | [ACC_RET_INACTIVE_CHANNEL] = "inactive channel", | |
278 | [ACC_RET_ACTIVE_CHANNEL] = "active channel", | |
279 | [ACC_RET_INVALID_QUEUE] = "invalid queue", | |
280 | [ACC_RET_INVALID_RET] = "invalid return code", | |
281 | }; | |
282 | ||
283 | if (result >= ARRAY_SIZE(result_str)) | |
284 | return result_str[ACC_RET_INVALID_RET]; | |
285 | else | |
286 | return result_str[result]; | |
287 | } | |
288 | ||
289 | static enum knav_acc_result | |
290 | knav_acc_write(struct knav_device *kdev, struct knav_pdsp_info *pdsp, | |
291 | struct knav_reg_acc_command *cmd) | |
292 | { | |
293 | u32 result; | |
294 | ||
295 | dev_dbg(kdev->dev, "acc command %08x %08x %08x %08x %08x\n", | |
296 | cmd->command, cmd->queue_mask, cmd->list_phys, | |
297 | cmd->queue_num, cmd->timer_config); | |
298 | ||
299 | writel_relaxed(cmd->timer_config, &pdsp->acc_command->timer_config); | |
300 | writel_relaxed(cmd->queue_num, &pdsp->acc_command->queue_num); | |
301 | writel_relaxed(cmd->list_phys, &pdsp->acc_command->list_phys); | |
302 | writel_relaxed(cmd->queue_mask, &pdsp->acc_command->queue_mask); | |
303 | writel_relaxed(cmd->command, &pdsp->acc_command->command); | |
304 | ||
305 | /* wait for the command to clear */ | |
306 | do { | |
307 | result = readl_relaxed(&pdsp->acc_command->command); | |
308 | } while ((result >> 8) & 0xff); | |
309 | ||
310 | return (result >> 24) & 0xff; | |
311 | } | |
312 | ||
313 | static void knav_acc_setup_cmd(struct knav_device *kdev, | |
314 | struct knav_range_info *range, | |
315 | struct knav_reg_acc_command *cmd, | |
316 | int queue) | |
317 | { | |
318 | struct knav_acc_info *info = &range->acc_info; | |
319 | struct knav_acc_channel *acc; | |
320 | int queue_base; | |
321 | u32 queue_mask; | |
322 | ||
323 | if (range->flags & RANGE_MULTI_QUEUE) { | |
324 | acc = range->acc; | |
325 | queue_base = range->queue_base; | |
326 | queue_mask = BIT(range->num_queues) - 1; | |
327 | } else { | |
328 | acc = range->acc + queue; | |
329 | queue_base = range->queue_base + queue; | |
330 | queue_mask = 0; | |
331 | } | |
332 | ||
333 | memset(cmd, 0, sizeof(*cmd)); | |
334 | cmd->command = acc->channel; | |
335 | cmd->queue_mask = queue_mask; | |
336 | cmd->list_phys = acc->list_dma[0]; | |
337 | cmd->queue_num = info->list_entries << 16; | |
338 | cmd->queue_num |= queue_base; | |
339 | ||
340 | cmd->timer_config = ACC_LIST_ENTRY_TYPE << 18; | |
341 | if (range->flags & RANGE_MULTI_QUEUE) | |
342 | cmd->timer_config |= ACC_CFG_MULTI_QUEUE; | |
343 | cmd->timer_config |= info->pacing_mode << 16; | |
344 | cmd->timer_config |= info->timer_count; | |
345 | } | |
346 | ||
347 | static void knav_acc_stop(struct knav_device *kdev, | |
348 | struct knav_range_info *range, | |
349 | int queue) | |
350 | { | |
351 | struct knav_reg_acc_command cmd; | |
352 | struct knav_acc_channel *acc; | |
353 | enum knav_acc_result result; | |
354 | ||
355 | acc = range->acc + queue; | |
356 | ||
357 | knav_acc_setup_cmd(kdev, range, &cmd, queue); | |
358 | cmd.command |= ACC_CMD_DISABLE_CHANNEL << 8; | |
359 | result = knav_acc_write(kdev, range->acc_info.pdsp, &cmd); | |
360 | ||
361 | dev_dbg(kdev->dev, "stopped acc channel %s, result %s\n", | |
362 | acc->name, knav_acc_result_str(result)); | |
363 | } | |
364 | ||
365 | static enum knav_acc_result knav_acc_start(struct knav_device *kdev, | |
366 | struct knav_range_info *range, | |
367 | int queue) | |
368 | { | |
369 | struct knav_reg_acc_command cmd; | |
370 | struct knav_acc_channel *acc; | |
371 | enum knav_acc_result result; | |
372 | ||
373 | acc = range->acc + queue; | |
374 | ||
375 | knav_acc_setup_cmd(kdev, range, &cmd, queue); | |
376 | cmd.command |= ACC_CMD_ENABLE_CHANNEL << 8; | |
377 | result = knav_acc_write(kdev, range->acc_info.pdsp, &cmd); | |
378 | ||
379 | dev_dbg(kdev->dev, "started acc channel %s, result %s\n", | |
380 | acc->name, knav_acc_result_str(result)); | |
381 | ||
382 | return result; | |
383 | } | |
384 | ||
385 | static int knav_acc_init_range(struct knav_range_info *range) | |
386 | { | |
387 | struct knav_device *kdev = range->kdev; | |
388 | struct knav_acc_channel *acc; | |
389 | enum knav_acc_result result; | |
390 | int queue; | |
391 | ||
392 | for (queue = 0; queue < range->num_queues; queue++) { | |
393 | acc = range->acc + queue; | |
394 | ||
395 | knav_acc_stop(kdev, range, queue); | |
396 | acc->list_index = 0; | |
397 | result = knav_acc_start(kdev, range, queue); | |
398 | ||
399 | if (result != ACC_RET_SUCCESS) | |
400 | return -EIO; | |
401 | ||
402 | if (range->flags & RANGE_MULTI_QUEUE) | |
403 | return 0; | |
404 | } | |
405 | return 0; | |
406 | } | |
407 | ||
408 | static int knav_acc_init_queue(struct knav_range_info *range, | |
409 | struct knav_queue_inst *kq) | |
410 | { | |
411 | unsigned id = kq->id - range->queue_base; | |
412 | ||
413 | kq->descs = devm_kzalloc(range->kdev->dev, | |
414 | ACC_DESCS_MAX * sizeof(u32), GFP_KERNEL); | |
415 | if (!kq->descs) | |
416 | return -ENOMEM; | |
417 | ||
418 | kq->acc = range->acc; | |
419 | if ((range->flags & RANGE_MULTI_QUEUE) == 0) | |
420 | kq->acc += id; | |
421 | return 0; | |
422 | } | |
423 | ||
424 | static int knav_acc_open_queue(struct knav_range_info *range, | |
425 | struct knav_queue_inst *inst, unsigned flags) | |
426 | { | |
427 | unsigned id = inst->id - range->queue_base; | |
428 | ||
429 | return knav_range_setup_acc_irq(range, id, true); | |
430 | } | |
431 | ||
432 | static int knav_acc_close_queue(struct knav_range_info *range, | |
433 | struct knav_queue_inst *inst) | |
434 | { | |
435 | unsigned id = inst->id - range->queue_base; | |
436 | ||
437 | return knav_range_setup_acc_irq(range, id, false); | |
438 | } | |
439 | ||
440 | static int knav_acc_free_range(struct knav_range_info *range) | |
441 | { | |
442 | struct knav_device *kdev = range->kdev; | |
443 | struct knav_acc_channel *acc; | |
444 | struct knav_acc_info *info; | |
445 | int channel, channels; | |
446 | ||
447 | info = &range->acc_info; | |
448 | ||
449 | if (range->flags & RANGE_MULTI_QUEUE) | |
450 | channels = 1; | |
451 | else | |
452 | channels = range->num_queues; | |
453 | ||
454 | for (channel = 0; channel < channels; channel++) { | |
455 | acc = range->acc + channel; | |
456 | if (!acc->list_cpu[0]) | |
457 | continue; | |
458 | dma_unmap_single(kdev->dev, acc->list_dma[0], | |
459 | info->mem_size, DMA_BIDIRECTIONAL); | |
460 | free_pages_exact(acc->list_cpu[0], info->mem_size); | |
461 | } | |
462 | devm_kfree(range->kdev->dev, range->acc); | |
463 | return 0; | |
464 | } | |
465 | ||
466 | struct knav_range_ops knav_acc_range_ops = { | |
467 | .set_notify = knav_acc_set_notify, | |
468 | .init_queue = knav_acc_init_queue, | |
469 | .open_queue = knav_acc_open_queue, | |
470 | .close_queue = knav_acc_close_queue, | |
471 | .init_range = knav_acc_init_range, | |
472 | .free_range = knav_acc_free_range, | |
473 | }; | |
474 | ||
475 | /** | |
476 | * knav_init_acc_range: Initialise accumulator ranges | |
477 | * | |
478 | * @kdev: qmss device | |
479 | * @node: device node | |
480 | * @range: qmms range information | |
481 | * | |
482 | * Return 0 on success or error | |
483 | */ | |
484 | int knav_init_acc_range(struct knav_device *kdev, | |
485 | struct device_node *node, | |
486 | struct knav_range_info *range) | |
487 | { | |
488 | struct knav_acc_channel *acc; | |
489 | struct knav_pdsp_info *pdsp; | |
490 | struct knav_acc_info *info; | |
491 | int ret, channel, channels; | |
492 | int list_size, mem_size; | |
493 | dma_addr_t list_dma; | |
494 | void *list_mem; | |
495 | u32 config[5]; | |
496 | ||
497 | range->flags |= RANGE_HAS_ACCUMULATOR; | |
498 | info = &range->acc_info; | |
499 | ||
500 | ret = of_property_read_u32_array(node, "accumulator", config, 5); | |
501 | if (ret) | |
502 | return ret; | |
503 | ||
504 | info->pdsp_id = config[0]; | |
505 | info->start_channel = config[1]; | |
506 | info->list_entries = config[2]; | |
507 | info->pacing_mode = config[3]; | |
508 | info->timer_count = config[4] / ACC_DEFAULT_PERIOD; | |
509 | ||
510 | if (info->start_channel > ACC_MAX_CHANNEL) { | |
511 | dev_err(kdev->dev, "channel %d invalid for range %s\n", | |
512 | info->start_channel, range->name); | |
513 | return -EINVAL; | |
514 | } | |
515 | ||
516 | if (info->pacing_mode > 3) { | |
517 | dev_err(kdev->dev, "pacing mode %d invalid for range %s\n", | |
518 | info->pacing_mode, range->name); | |
519 | return -EINVAL; | |
520 | } | |
521 | ||
522 | pdsp = knav_find_pdsp(kdev, info->pdsp_id); | |
523 | if (!pdsp) { | |
524 | dev_err(kdev->dev, "pdsp id %d not found for range %s\n", | |
525 | info->pdsp_id, range->name); | |
526 | return -EINVAL; | |
527 | } | |
528 | ||
529 | info->pdsp = pdsp; | |
530 | channels = range->num_queues; | |
531 | if (of_get_property(node, "multi-queue", NULL)) { | |
532 | range->flags |= RANGE_MULTI_QUEUE; | |
533 | channels = 1; | |
534 | if (range->queue_base & (32 - 1)) { | |
535 | dev_err(kdev->dev, | |
536 | "misaligned multi-queue accumulator range %s\n", | |
537 | range->name); | |
538 | return -EINVAL; | |
539 | } | |
540 | if (range->num_queues > 32) { | |
541 | dev_err(kdev->dev, | |
542 | "too many queues in accumulator range %s\n", | |
543 | range->name); | |
544 | return -EINVAL; | |
545 | } | |
546 | } | |
547 | ||
548 | /* figure out list size */ | |
549 | list_size = info->list_entries; | |
550 | list_size *= ACC_LIST_ENTRY_WORDS * sizeof(u32); | |
551 | info->list_size = list_size; | |
552 | mem_size = PAGE_ALIGN(list_size * 2); | |
553 | info->mem_size = mem_size; | |
554 | range->acc = devm_kzalloc(kdev->dev, channels * sizeof(*range->acc), | |
555 | GFP_KERNEL); | |
556 | if (!range->acc) | |
557 | return -ENOMEM; | |
558 | ||
559 | for (channel = 0; channel < channels; channel++) { | |
560 | acc = range->acc + channel; | |
561 | acc->channel = info->start_channel + channel; | |
562 | ||
563 | /* allocate memory for the two lists */ | |
564 | list_mem = alloc_pages_exact(mem_size, GFP_KERNEL | GFP_DMA); | |
565 | if (!list_mem) | |
566 | return -ENOMEM; | |
567 | ||
568 | list_dma = dma_map_single(kdev->dev, list_mem, mem_size, | |
569 | DMA_BIDIRECTIONAL); | |
570 | if (dma_mapping_error(kdev->dev, list_dma)) { | |
571 | free_pages_exact(list_mem, mem_size); | |
572 | return -ENOMEM; | |
573 | } | |
574 | ||
575 | memset(list_mem, 0, mem_size); | |
576 | dma_sync_single_for_device(kdev->dev, list_dma, mem_size, | |
577 | DMA_TO_DEVICE); | |
578 | scnprintf(acc->name, sizeof(acc->name), "hwqueue-acc-%d", | |
579 | acc->channel); | |
580 | acc->list_cpu[0] = list_mem; | |
581 | acc->list_cpu[1] = list_mem + list_size; | |
582 | acc->list_dma[0] = list_dma; | |
583 | acc->list_dma[1] = list_dma + list_size; | |
584 | dev_dbg(kdev->dev, "%s: channel %d, phys %08x, virt %8p\n", | |
585 | acc->name, acc->channel, list_dma, list_mem); | |
586 | } | |
587 | ||
588 | range->ops = &knav_acc_range_ops; | |
589 | return 0; | |
590 | } | |
591 | EXPORT_SYMBOL_GPL(knav_init_acc_range); |