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TOMOYO Linux Cross Reference
Linux/sound/soc/intel/atom/sst/sst.c

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  1 /*
  2  *  sst.c - Intel SST Driver for audio engine
  3  *
  4  *  Copyright (C) 2008-14       Intel Corp
  5  *  Authors:    Vinod Koul <vinod.koul@intel.com>
  6  *              Harsha Priya <priya.harsha@intel.com>
  7  *              Dharageswari R <dharageswari.r@intel.com>
  8  *              KP Jeeja <jeeja.kp@intel.com>
  9  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 10  *
 11  *  This program is free software; you can redistribute it and/or modify
 12  *  it under the terms of the GNU General Public License as published by
 13  *  the Free Software Foundation; version 2 of the License.
 14  *
 15  *  This program is distributed in the hope that it will be useful, but
 16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
 17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  *  General Public License for more details.
 19  *
 20  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 21  */
 22 #include <linux/module.h>
 23 #include <linux/fs.h>
 24 #include <linux/interrupt.h>
 25 #include <linux/firmware.h>
 26 #include <linux/pm_runtime.h>
 27 #include <linux/pm_qos.h>
 28 #include <linux/async.h>
 29 #include <linux/acpi.h>
 30 #include <linux/sysfs.h>
 31 #include <sound/core.h>
 32 #include <sound/soc.h>
 33 #include <asm/platform_sst_audio.h>
 34 #include "../sst-mfld-platform.h"
 35 #include "sst.h"
 36 #include "../../common/sst-dsp.h"
 37 
 38 MODULE_AUTHOR("Vinod Koul <vinod.koul@intel.com>");
 39 MODULE_AUTHOR("Harsha Priya <priya.harsha@intel.com>");
 40 MODULE_DESCRIPTION("Intel (R) SST(R) Audio Engine Driver");
 41 MODULE_LICENSE("GPL v2");
 42 
 43 static inline bool sst_is_process_reply(u32 msg_id)
 44 {
 45         return ((msg_id & PROCESS_MSG) ? true : false);
 46 }
 47 
 48 static inline bool sst_validate_mailbox_size(unsigned int size)
 49 {
 50         return ((size <= SST_MAILBOX_SIZE) ? true : false);
 51 }
 52 
 53 static irqreturn_t intel_sst_interrupt_mrfld(int irq, void *context)
 54 {
 55         union interrupt_reg_mrfld isr;
 56         union ipc_header_mrfld header;
 57         union sst_imr_reg_mrfld imr;
 58         struct ipc_post *msg = NULL;
 59         unsigned int size = 0;
 60         struct intel_sst_drv *drv = (struct intel_sst_drv *) context;
 61         irqreturn_t retval = IRQ_HANDLED;
 62 
 63         /* Interrupt arrived, check src */
 64         isr.full = sst_shim_read64(drv->shim, SST_ISRX);
 65 
 66         if (isr.part.done_interrupt) {
 67                 /* Clear done bit */
 68                 spin_lock(&drv->ipc_spin_lock);
 69                 header.full = sst_shim_read64(drv->shim,
 70                                         drv->ipc_reg.ipcx);
 71                 header.p.header_high.part.done = 0;
 72                 sst_shim_write64(drv->shim, drv->ipc_reg.ipcx, header.full);
 73 
 74                 /* write 1 to clear status register */;
 75                 isr.part.done_interrupt = 1;
 76                 sst_shim_write64(drv->shim, SST_ISRX, isr.full);
 77                 spin_unlock(&drv->ipc_spin_lock);
 78 
 79                 /* we can send more messages to DSP so trigger work */
 80                 queue_work(drv->post_msg_wq, &drv->ipc_post_msg_wq);
 81                 retval = IRQ_HANDLED;
 82         }
 83 
 84         if (isr.part.busy_interrupt) {
 85                 /* message from dsp so copy that */
 86                 spin_lock(&drv->ipc_spin_lock);
 87                 imr.full = sst_shim_read64(drv->shim, SST_IMRX);
 88                 imr.part.busy_interrupt = 1;
 89                 sst_shim_write64(drv->shim, SST_IMRX, imr.full);
 90                 spin_unlock(&drv->ipc_spin_lock);
 91                 header.full =  sst_shim_read64(drv->shim, drv->ipc_reg.ipcd);
 92 
 93                 if (sst_create_ipc_msg(&msg, header.p.header_high.part.large)) {
 94                         drv->ops->clear_interrupt(drv);
 95                         return IRQ_HANDLED;
 96                 }
 97 
 98                 if (header.p.header_high.part.large) {
 99                         size = header.p.header_low_payload;
100                         if (sst_validate_mailbox_size(size)) {
101                                 memcpy_fromio(msg->mailbox_data,
102                                         drv->mailbox + drv->mailbox_recv_offset, size);
103                         } else {
104                                 dev_err(drv->dev,
105                                         "Mailbox not copied, payload size is: %u\n", size);
106                                 header.p.header_low_payload = 0;
107                         }
108                 }
109 
110                 msg->mrfld_header = header;
111                 msg->is_process_reply =
112                         sst_is_process_reply(header.p.header_high.part.msg_id);
113                 spin_lock(&drv->rx_msg_lock);
114                 list_add_tail(&msg->node, &drv->rx_list);
115                 spin_unlock(&drv->rx_msg_lock);
116                 drv->ops->clear_interrupt(drv);
117                 retval = IRQ_WAKE_THREAD;
118         }
119         return retval;
120 }
121 
122 static irqreturn_t intel_sst_irq_thread_mrfld(int irq, void *context)
123 {
124         struct intel_sst_drv *drv = (struct intel_sst_drv *) context;
125         struct ipc_post *__msg, *msg = NULL;
126         unsigned long irq_flags;
127 
128         spin_lock_irqsave(&drv->rx_msg_lock, irq_flags);
129         if (list_empty(&drv->rx_list)) {
130                 spin_unlock_irqrestore(&drv->rx_msg_lock, irq_flags);
131                 return IRQ_HANDLED;
132         }
133 
134         list_for_each_entry_safe(msg, __msg, &drv->rx_list, node) {
135                 list_del(&msg->node);
136                 spin_unlock_irqrestore(&drv->rx_msg_lock, irq_flags);
137                 if (msg->is_process_reply)
138                         drv->ops->process_message(msg);
139                 else
140                         drv->ops->process_reply(drv, msg);
141 
142                 if (msg->is_large)
143                         kfree(msg->mailbox_data);
144                 kfree(msg);
145                 spin_lock_irqsave(&drv->rx_msg_lock, irq_flags);
146         }
147         spin_unlock_irqrestore(&drv->rx_msg_lock, irq_flags);
148         return IRQ_HANDLED;
149 }
150 
151 static int sst_save_dsp_context_v2(struct intel_sst_drv *sst)
152 {
153         int ret = 0;
154 
155         ret = sst_prepare_and_post_msg(sst, SST_TASK_ID_MEDIA, IPC_CMD,
156                         IPC_PREP_D3, PIPE_RSVD, 0, NULL, NULL,
157                         true, true, false, true);
158 
159         if (ret < 0) {
160                 dev_err(sst->dev, "not suspending FW!!, Err: %d\n", ret);
161                 return -EIO;
162         }
163 
164         return 0;
165 }
166 
167 
168 static struct intel_sst_ops mrfld_ops = {
169         .interrupt = intel_sst_interrupt_mrfld,
170         .irq_thread = intel_sst_irq_thread_mrfld,
171         .clear_interrupt = intel_sst_clear_intr_mrfld,
172         .start = sst_start_mrfld,
173         .reset = intel_sst_reset_dsp_mrfld,
174         .post_message = sst_post_message_mrfld,
175         .process_reply = sst_process_reply_mrfld,
176         .save_dsp_context =  sst_save_dsp_context_v2,
177         .alloc_stream = sst_alloc_stream_mrfld,
178         .post_download = sst_post_download_mrfld,
179 };
180 
181 int sst_driver_ops(struct intel_sst_drv *sst)
182 {
183 
184         switch (sst->dev_id) {
185         case SST_MRFLD_PCI_ID:
186         case SST_BYT_ACPI_ID:
187         case SST_CHV_ACPI_ID:
188                 sst->tstamp = SST_TIME_STAMP_MRFLD;
189                 sst->ops = &mrfld_ops;
190                 return 0;
191 
192         default:
193                 dev_err(sst->dev,
194                         "SST Driver capabilities missing for dev_id: %x",
195                         sst->dev_id);
196                 return -EINVAL;
197         };
198 }
199 
200 void sst_process_pending_msg(struct work_struct *work)
201 {
202         struct intel_sst_drv *ctx = container_of(work,
203                         struct intel_sst_drv, ipc_post_msg_wq);
204 
205         ctx->ops->post_message(ctx, NULL, false);
206 }
207 
208 static int sst_workqueue_init(struct intel_sst_drv *ctx)
209 {
210         INIT_LIST_HEAD(&ctx->memcpy_list);
211         INIT_LIST_HEAD(&ctx->rx_list);
212         INIT_LIST_HEAD(&ctx->ipc_dispatch_list);
213         INIT_LIST_HEAD(&ctx->block_list);
214         INIT_WORK(&ctx->ipc_post_msg_wq, sst_process_pending_msg);
215         init_waitqueue_head(&ctx->wait_queue);
216 
217         ctx->post_msg_wq =
218                 create_singlethread_workqueue("sst_post_msg_wq");
219         if (!ctx->post_msg_wq)
220                 return -EBUSY;
221         return 0;
222 }
223 
224 static void sst_init_locks(struct intel_sst_drv *ctx)
225 {
226         mutex_init(&ctx->sst_lock);
227         spin_lock_init(&ctx->rx_msg_lock);
228         spin_lock_init(&ctx->ipc_spin_lock);
229         spin_lock_init(&ctx->block_lock);
230 }
231 
232 int sst_alloc_drv_context(struct intel_sst_drv **ctx,
233                 struct device *dev, unsigned int dev_id)
234 {
235         *ctx = devm_kzalloc(dev, sizeof(struct intel_sst_drv), GFP_KERNEL);
236         if (!(*ctx))
237                 return -ENOMEM;
238 
239         (*ctx)->dev = dev;
240         (*ctx)->dev_id = dev_id;
241 
242         return 0;
243 }
244 EXPORT_SYMBOL_GPL(sst_alloc_drv_context);
245 
246 static ssize_t firmware_version_show(struct device *dev,
247                             struct device_attribute *attr, char *buf)
248 {
249         struct intel_sst_drv *ctx = dev_get_drvdata(dev);
250 
251         if (ctx->fw_version.type == 0 && ctx->fw_version.major == 0 &&
252             ctx->fw_version.minor == 0 && ctx->fw_version.build == 0)
253                 return sprintf(buf, "FW not yet loaded\n");
254         else
255                 return sprintf(buf, "v%02x.%02x.%02x.%02x\n",
256                                ctx->fw_version.type, ctx->fw_version.major,
257                                ctx->fw_version.minor, ctx->fw_version.build);
258 
259 }
260 
261 static DEVICE_ATTR_RO(firmware_version);
262 
263 static const struct attribute *sst_fw_version_attrs[] = {
264         &dev_attr_firmware_version.attr,
265         NULL,
266 };
267 
268 static const struct attribute_group sst_fw_version_attr_group = {
269         .attrs = (struct attribute **)sst_fw_version_attrs,
270 };
271 
272 int sst_context_init(struct intel_sst_drv *ctx)
273 {
274         int ret = 0, i;
275 
276         if (!ctx->pdata)
277                 return -EINVAL;
278 
279         if (!ctx->pdata->probe_data)
280                 return -EINVAL;
281 
282         memcpy(&ctx->info, ctx->pdata->probe_data, sizeof(ctx->info));
283 
284         ret = sst_driver_ops(ctx);
285         if (ret != 0)
286                 return -EINVAL;
287 
288         sst_init_locks(ctx);
289         sst_set_fw_state_locked(ctx, SST_RESET);
290 
291         /* pvt_id 0 reserved for async messages */
292         ctx->pvt_id = 1;
293         ctx->stream_cnt = 0;
294         ctx->fw_in_mem = NULL;
295         /* we use memcpy, so set to 0 */
296         ctx->use_dma = 0;
297         ctx->use_lli = 0;
298 
299         if (sst_workqueue_init(ctx))
300                 return -EINVAL;
301 
302         ctx->mailbox_recv_offset = ctx->pdata->ipc_info->mbox_recv_off;
303         ctx->ipc_reg.ipcx = SST_IPCX + ctx->pdata->ipc_info->ipc_offset;
304         ctx->ipc_reg.ipcd = SST_IPCD + ctx->pdata->ipc_info->ipc_offset;
305 
306         dev_info(ctx->dev, "Got drv data max stream %d\n",
307                                 ctx->info.max_streams);
308 
309         for (i = 1; i <= ctx->info.max_streams; i++) {
310                 struct stream_info *stream = &ctx->streams[i];
311 
312                 memset(stream, 0, sizeof(*stream));
313                 stream->pipe_id = PIPE_RSVD;
314                 mutex_init(&stream->lock);
315         }
316 
317         /* Register the ISR */
318         ret = devm_request_threaded_irq(ctx->dev, ctx->irq_num, ctx->ops->interrupt,
319                                         ctx->ops->irq_thread, 0, SST_DRV_NAME,
320                                         ctx);
321         if (ret)
322                 goto do_free_mem;
323 
324         dev_dbg(ctx->dev, "Registered IRQ %#x\n", ctx->irq_num);
325 
326         /* default intr are unmasked so set this as masked */
327         sst_shim_write64(ctx->shim, SST_IMRX, 0xFFFF0038);
328 
329         ctx->qos = devm_kzalloc(ctx->dev,
330                 sizeof(struct pm_qos_request), GFP_KERNEL);
331         if (!ctx->qos) {
332                 ret = -ENOMEM;
333                 goto do_free_mem;
334         }
335         pm_qos_add_request(ctx->qos, PM_QOS_CPU_DMA_LATENCY,
336                                 PM_QOS_DEFAULT_VALUE);
337 
338         dev_dbg(ctx->dev, "Requesting FW %s now...\n", ctx->firmware_name);
339         ret = request_firmware_nowait(THIS_MODULE, true, ctx->firmware_name,
340                                       ctx->dev, GFP_KERNEL, ctx, sst_firmware_load_cb);
341         if (ret) {
342                 dev_err(ctx->dev, "Firmware download failed:%d\n", ret);
343                 goto do_free_mem;
344         }
345 
346         ret = sysfs_create_group(&ctx->dev->kobj,
347                                  &sst_fw_version_attr_group);
348         if (ret) {
349                 dev_err(ctx->dev,
350                         "Unable to create sysfs\n");
351                 goto err_sysfs;
352         }
353 
354         sst_register(ctx->dev);
355         return 0;
356 err_sysfs:
357         sysfs_remove_group(&ctx->dev->kobj, &sst_fw_version_attr_group);
358 
359 do_free_mem:
360         destroy_workqueue(ctx->post_msg_wq);
361         return ret;
362 }
363 EXPORT_SYMBOL_GPL(sst_context_init);
364 
365 void sst_context_cleanup(struct intel_sst_drv *ctx)
366 {
367         pm_runtime_get_noresume(ctx->dev);
368         pm_runtime_disable(ctx->dev);
369         sst_unregister(ctx->dev);
370         sst_set_fw_state_locked(ctx, SST_SHUTDOWN);
371         sysfs_remove_group(&ctx->dev->kobj, &sst_fw_version_attr_group);
372         flush_scheduled_work();
373         destroy_workqueue(ctx->post_msg_wq);
374         pm_qos_remove_request(ctx->qos);
375         kfree(ctx->fw_sg_list.src);
376         kfree(ctx->fw_sg_list.dst);
377         ctx->fw_sg_list.list_len = 0;
378         kfree(ctx->fw_in_mem);
379         ctx->fw_in_mem = NULL;
380         sst_memcpy_free_resources(ctx);
381         ctx = NULL;
382 }
383 EXPORT_SYMBOL_GPL(sst_context_cleanup);
384 
385 void sst_configure_runtime_pm(struct intel_sst_drv *ctx)
386 {
387         pm_runtime_set_autosuspend_delay(ctx->dev, SST_SUSPEND_DELAY);
388         pm_runtime_use_autosuspend(ctx->dev);
389         /*
390          * For acpi devices, the actual physical device state is
391          * initially active. So change the state to active before
392          * enabling the pm
393          */
394 
395         if (!acpi_disabled)
396                 pm_runtime_set_active(ctx->dev);
397 
398         pm_runtime_enable(ctx->dev);
399 
400         if (acpi_disabled)
401                 pm_runtime_set_active(ctx->dev);
402         else
403                 pm_runtime_put_noidle(ctx->dev);
404 }
405 EXPORT_SYMBOL_GPL(sst_configure_runtime_pm);
406 
407 static int intel_sst_runtime_suspend(struct device *dev)
408 {
409         int ret = 0;
410         struct intel_sst_drv *ctx = dev_get_drvdata(dev);
411 
412         if (ctx->sst_state == SST_RESET) {
413                 dev_dbg(dev, "LPE is already in RESET state, No action\n");
414                 return 0;
415         }
416         /* save fw context */
417         if (ctx->ops->save_dsp_context(ctx))
418                 return -EBUSY;
419 
420         /* Move the SST state to Reset */
421         sst_set_fw_state_locked(ctx, SST_RESET);
422 
423         synchronize_irq(ctx->irq_num);
424         flush_workqueue(ctx->post_msg_wq);
425 
426         ctx->ops->reset(ctx);
427 
428         return ret;
429 }
430 
431 static int intel_sst_suspend(struct device *dev)
432 {
433         struct intel_sst_drv *ctx = dev_get_drvdata(dev);
434         struct sst_fw_save *fw_save;
435         int i, ret = 0;
436 
437         /* check first if we are already in SW reset */
438         if (ctx->sst_state == SST_RESET)
439                 return 0;
440 
441         /*
442          * check if any stream is active and running
443          * they should already by suspend by soc_suspend
444          */
445         for (i = 1; i <= ctx->info.max_streams; i++) {
446                 struct stream_info *stream = &ctx->streams[i];
447 
448                 if (stream->status == STREAM_RUNNING) {
449                         dev_err(dev, "stream %d is running, can't suspend, abort\n", i);
450                         return -EBUSY;
451                 }
452 
453                 if (ctx->pdata->streams_lost_on_suspend) {
454                         stream->resume_status = stream->status;
455                         stream->resume_prev = stream->prev;
456                         if (stream->status != STREAM_UN_INIT)
457                                 sst_free_stream(ctx, i);
458                 }
459         }
460         synchronize_irq(ctx->irq_num);
461         flush_workqueue(ctx->post_msg_wq);
462 
463         /* Move the SST state to Reset */
464         sst_set_fw_state_locked(ctx, SST_RESET);
465 
466         /* tell DSP we are suspending */
467         if (ctx->ops->save_dsp_context(ctx))
468                 return -EBUSY;
469 
470         /* save the memories */
471         fw_save = kzalloc(sizeof(*fw_save), GFP_KERNEL);
472         if (!fw_save)
473                 return -ENOMEM;
474         fw_save->iram = kvzalloc(ctx->iram_end - ctx->iram_base, GFP_KERNEL);
475         if (!fw_save->iram) {
476                 ret = -ENOMEM;
477                 goto iram;
478         }
479         fw_save->dram = kvzalloc(ctx->dram_end - ctx->dram_base, GFP_KERNEL);
480         if (!fw_save->dram) {
481                 ret = -ENOMEM;
482                 goto dram;
483         }
484         fw_save->sram = kvzalloc(SST_MAILBOX_SIZE, GFP_KERNEL);
485         if (!fw_save->sram) {
486                 ret = -ENOMEM;
487                 goto sram;
488         }
489 
490         fw_save->ddr = kvzalloc(ctx->ddr_end - ctx->ddr_base, GFP_KERNEL);
491         if (!fw_save->ddr) {
492                 ret = -ENOMEM;
493                 goto ddr;
494         }
495 
496         memcpy32_fromio(fw_save->iram, ctx->iram, ctx->iram_end - ctx->iram_base);
497         memcpy32_fromio(fw_save->dram, ctx->dram, ctx->dram_end - ctx->dram_base);
498         memcpy32_fromio(fw_save->sram, ctx->mailbox, SST_MAILBOX_SIZE);
499         memcpy32_fromio(fw_save->ddr, ctx->ddr, ctx->ddr_end - ctx->ddr_base);
500 
501         ctx->fw_save = fw_save;
502         ctx->ops->reset(ctx);
503         return 0;
504 ddr:
505         kvfree(fw_save->sram);
506 sram:
507         kvfree(fw_save->dram);
508 dram:
509         kvfree(fw_save->iram);
510 iram:
511         kfree(fw_save);
512         return ret;
513 }
514 
515 static int intel_sst_resume(struct device *dev)
516 {
517         struct intel_sst_drv *ctx = dev_get_drvdata(dev);
518         struct sst_fw_save *fw_save = ctx->fw_save;
519         struct sst_block *block;
520         int i, ret = 0;
521 
522         if (!fw_save)
523                 return 0;
524 
525         sst_set_fw_state_locked(ctx, SST_FW_LOADING);
526 
527         /* we have to restore the memory saved */
528         ctx->ops->reset(ctx);
529 
530         ctx->fw_save = NULL;
531 
532         memcpy32_toio(ctx->iram, fw_save->iram, ctx->iram_end - ctx->iram_base);
533         memcpy32_toio(ctx->dram, fw_save->dram, ctx->dram_end - ctx->dram_base);
534         memcpy32_toio(ctx->mailbox, fw_save->sram, SST_MAILBOX_SIZE);
535         memcpy32_toio(ctx->ddr, fw_save->ddr, ctx->ddr_end - ctx->ddr_base);
536 
537         kvfree(fw_save->sram);
538         kvfree(fw_save->dram);
539         kvfree(fw_save->iram);
540         kvfree(fw_save->ddr);
541         kfree(fw_save);
542 
543         block = sst_create_block(ctx, 0, FW_DWNL_ID);
544         if (block == NULL)
545                 return -ENOMEM;
546 
547 
548         /* start and wait for ack */
549         ctx->ops->start(ctx);
550         ret = sst_wait_timeout(ctx, block);
551         if (ret) {
552                 dev_err(ctx->dev, "fw download failed %d\n", ret);
553                 /* FW download failed due to timeout */
554                 ret = -EBUSY;
555 
556         } else {
557                 sst_set_fw_state_locked(ctx, SST_FW_RUNNING);
558         }
559 
560         if (ctx->pdata->streams_lost_on_suspend) {
561                 for (i = 1; i <= ctx->info.max_streams; i++) {
562                         struct stream_info *stream = &ctx->streams[i];
563 
564                         if (stream->resume_status != STREAM_UN_INIT) {
565                                 dev_dbg(ctx->dev, "Re-allocing stream %d status %d prev %d\n",
566                                         i, stream->resume_status,
567                                         stream->resume_prev);
568                                 sst_realloc_stream(ctx, i);
569                                 stream->status = stream->resume_status;
570                                 stream->prev = stream->resume_prev;
571                         }
572                 }
573         }
574 
575         sst_free_block(ctx, block);
576         return ret;
577 }
578 
579 const struct dev_pm_ops intel_sst_pm = {
580         .suspend = intel_sst_suspend,
581         .resume = intel_sst_resume,
582         .runtime_suspend = intel_sst_runtime_suspend,
583 };
584 EXPORT_SYMBOL_GPL(intel_sst_pm);
585 

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