sound/soc/intel/sst/sst.c

   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 <sound/core.h>
  31 #include <sound/soc.h>
  32 #include <asm/platform_sst_audio.h>
  33 #include "../sst-mfld-platform.h"
  34 #include "sst.h"
  35 #include "../sst-dsp.h"
  36
  37 MODULE_AUTHOR("Vinod Koul <vinod.koul@intel.com>");
  38 MODULE_AUTHOR("Harsha Priya <priya.harsha@intel.com>");
  39 MODULE_DESCRIPTION("Intel (R) SST(R) Audio Engine Driver");
  40 MODULE_LICENSE("GPL v2");
  41
  42 static inline bool sst_is_process_reply(u32 msg_id)
  43 {
  44         return ((msg_id & PROCESS_MSG) ? true : false);
  45 }
  46
  47 static inline bool sst_validate_mailbox_size(unsigned int size)
  48 {
  49         return ((size <= SST_MAILBOX_SIZE) ? true : false);
  50 }
  51
  52 static irqreturn_t intel_sst_interrupt_mrfld(int irq, void *context)
  53 {
  54         union interrupt_reg_mrfld isr;
  55         union ipc_header_mrfld header;
  56         union sst_imr_reg_mrfld imr;
  57         struct ipc_post *msg = NULL;
  58         unsigned int size = 0;
  59         struct intel_sst_drv *drv = (struct intel_sst_drv *) context;
  60         irqreturn_t retval = IRQ_HANDLED;
  61
  62         /* Interrupt arrived, check src */
  63         isr.full = sst_shim_read64(drv->shim, SST_ISRX);
  64
  65         if (isr.part.done_interrupt) {
  66                 /* Clear done bit */
  67                 spin_lock(&drv->ipc_spin_lock);
  68                 header.full = sst_shim_read64(drv->shim,
  69                                         drv->ipc_reg.ipcx);
  70                 header.p.header_high.part.done = 0;
  71                 sst_shim_write64(drv->shim, drv->ipc_reg.ipcx, header.full);
  72
  73                 /* write 1 to clear status register */;
  74                 isr.part.done_interrupt = 1;
  75                 sst_shim_write64(drv->shim, SST_ISRX, isr.full);
  76                 spin_unlock(&drv->ipc_spin_lock);
  77
  78                 /* we can send more messages to DSP so trigger work */
  79                 queue_work(drv->post_msg_wq, &drv->ipc_post_msg_wq);
  80                 retval = IRQ_HANDLED;
  81         }
  82
  83         if (isr.part.busy_interrupt) {
  84                 /* message from dsp so copy that */
  85                 spin_lock(&drv->ipc_spin_lock);
  86                 imr.full = sst_shim_read64(drv->shim, SST_IMRX);
  87                 imr.part.busy_interrupt = 1;
  88                 sst_shim_write64(drv->shim, SST_IMRX, imr.full);
  89                 spin_unlock(&drv->ipc_spin_lock);
  90                 header.full =  sst_shim_read64(drv->shim, drv->ipc_reg.ipcd);
  91
  92                 if (sst_create_ipc_msg(&msg, header.p.header_high.part.large)) {
  93                         drv->ops->clear_interrupt(drv);
  94                         return IRQ_HANDLED;
  95                 }
  96
  97                 if (header.p.header_high.part.large) {
  98                         size = header.p.header_low_payload;
  99                         if (sst_validate_mailbox_size(size)) {
 100                                 memcpy_fromio(msg->mailbox_data,
 101                                         drv->mailbox + drv->mailbox_recv_offset, size);
 102                         } else {
 103                                 dev_err(drv->dev,
 104                                         "Mailbox not copied, payload size is: %u\n", size);
 105                                 header.p.header_low_payload = 0;
 106                         }
 107                 }
 108
 109                 msg->mrfld_header = header;
 110                 msg->is_process_reply =
 111                         sst_is_process_reply(header.p.header_high.part.msg_id);
 112                 spin_lock(&drv->rx_msg_lock);
 113                 list_add_tail(&msg->node, &drv->rx_list);
 114                 spin_unlock(&drv->rx_msg_lock);
 115                 drv->ops->clear_interrupt(drv);
 116                 retval = IRQ_WAKE_THREAD;
 117         }
 118         return retval;
 119 }
 120
 121 static irqreturn_t intel_sst_irq_thread_mrfld(int irq, void *context)
 122 {
 123         struct intel_sst_drv *drv = (struct intel_sst_drv *) context;
 124         struct ipc_post *__msg, *msg = NULL;
 125         unsigned long irq_flags;
 126
 127         spin_lock_irqsave(&drv->rx_msg_lock, irq_flags);
 128         if (list_empty(&drv->rx_list)) {
 129                 spin_unlock_irqrestore(&drv->rx_msg_lock, irq_flags);
 130                 return IRQ_HANDLED;
 131         }
 132
 133         list_for_each_entry_safe(msg, __msg, &drv->rx_list, node) {
 134                 list_del(&msg->node);
 135                 spin_unlock_irqrestore(&drv->rx_msg_lock, irq_flags);
 136                 if (msg->is_process_reply)
 137                         drv->ops->process_message(msg);
 138                 else
 139                         drv->ops->process_reply(drv, msg);
 140
 141                 if (msg->is_large)
 142                         kfree(msg->mailbox_data);
 143                 kfree(msg);
 144                 spin_lock_irqsave(&drv->rx_msg_lock, irq_flags);
 145         }
 146         spin_unlock_irqrestore(&drv->rx_msg_lock, irq_flags);
 147         return IRQ_HANDLED;
 148 }
 149
 150 static int sst_save_dsp_context_v2(struct intel_sst_drv *sst)
 151 {
 152         int ret = 0;
 153
 154         ret = sst_prepare_and_post_msg(sst, SST_TASK_ID_MEDIA, IPC_CMD,
 155                         IPC_PREP_D3, PIPE_RSVD, 0, NULL, NULL,
 156                         true, true, false, true);
 157
 158         if (ret < 0) {
 159                 dev_err(sst->dev, "not suspending FW!!, Err: %d\n", ret);
 160                 return -EIO;
 161         }
 162
 163         return 0;
 164 }
 165
 166
 167 static struct intel_sst_ops mrfld_ops = {
 168         .interrupt = intel_sst_interrupt_mrfld,
 169         .irq_thread = intel_sst_irq_thread_mrfld,
 170         .clear_interrupt = intel_sst_clear_intr_mrfld,
 171         .start = sst_start_mrfld,
 172         .reset = intel_sst_reset_dsp_mrfld,
 173         .post_message = sst_post_message_mrfld,
 174         .process_reply = sst_process_reply_mrfld,
 175         .save_dsp_context =  sst_save_dsp_context_v2,
 176         .alloc_stream = sst_alloc_stream_mrfld,
 177         .post_download = sst_post_download_mrfld,
 178 };
 179
 180 int sst_driver_ops(struct intel_sst_drv *sst)
 181 {
 182
 183         switch (sst->dev_id) {
 184         case SST_MRFLD_PCI_ID:
 185         case SST_BYT_ACPI_ID:
 186         case SST_CHV_ACPI_ID:
 187                 sst->tstamp = SST_TIME_STAMP_MRFLD;
 188                 sst->ops = &mrfld_ops;
 189                 return 0;
 190
 191         default:
 192                 dev_err(sst->dev,
 193                         "SST Driver capablities missing for dev_id: %x", sst->dev_id);
 194                 return -EINVAL;
 195         };
 196 }
 197
 198 void sst_process_pending_msg(struct work_struct *work)
 199 {
 200         struct intel_sst_drv *ctx = container_of(work,
 201                         struct intel_sst_drv, ipc_post_msg_wq);
 202
 203         ctx->ops->post_message(ctx, NULL, false);
 204 }
 205
 206 static int sst_workqueue_init(struct intel_sst_drv *ctx)
 207 {
 208         INIT_LIST_HEAD(&ctx->memcpy_list);
 209         INIT_LIST_HEAD(&ctx->rx_list);
 210         INIT_LIST_HEAD(&ctx->ipc_dispatch_list);
 211         INIT_LIST_HEAD(&ctx->block_list);
 212         INIT_WORK(&ctx->ipc_post_msg_wq, sst_process_pending_msg);
 213         init_waitqueue_head(&ctx->wait_queue);
 214
 215         ctx->post_msg_wq =
 216                 create_singlethread_workqueue("sst_post_msg_wq");
 217         if (!ctx->post_msg_wq)
 218                 return -EBUSY;
 219         return 0;
 220 }
 221
 222 static void sst_init_locks(struct intel_sst_drv *ctx)
 223 {
 224         mutex_init(&ctx->sst_lock);
 225         spin_lock_init(&ctx->rx_msg_lock);
 226         spin_lock_init(&ctx->ipc_spin_lock);
 227         spin_lock_init(&ctx->block_lock);
 228 }
 229
 230 int sst_alloc_drv_context(struct intel_sst_drv **ctx,
 231                 struct device *dev, unsigned int dev_id)
 232 {
 233         *ctx = devm_kzalloc(dev, sizeof(struct intel_sst_drv), GFP_KERNEL);
 234         if (!(*ctx))
 235                 return -ENOMEM;
 236
 237         (*ctx)->dev = dev;
 238         (*ctx)->dev_id = dev_id;
 239
 240         return 0;
 241 }
 242 EXPORT_SYMBOL_GPL(sst_alloc_drv_context);
 243
 244 int sst_context_init(struct intel_sst_drv *ctx)
 245 {
 246         int ret = 0, i;
 247
 248         if (!ctx->pdata)
 249                 return -EINVAL;
 250
 251         if (!ctx->pdata->probe_data)
 252                 return -EINVAL;
 253
 254         memcpy(&ctx->info, ctx->pdata->probe_data, sizeof(ctx->info));
 255
 256         ret = sst_driver_ops(ctx);
 257         if (ret != 0)
 258                 return -EINVAL;
 259
 260         sst_init_locks(ctx);
 261         sst_set_fw_state_locked(ctx, SST_RESET);
 262
 263         /* pvt_id 0 reserved for async messages */
 264         ctx->pvt_id = 1;
 265         ctx->stream_cnt = 0;
 266         ctx->fw_in_mem = NULL;
 267         /* we use memcpy, so set to 0 */
 268         ctx->use_dma = 0;
 269         ctx->use_lli = 0;
 270
 271         if (sst_workqueue_init(ctx))
 272                 return -EINVAL;
 273
 274         ctx->mailbox_recv_offset = ctx->pdata->ipc_info->mbox_recv_off;
 275         ctx->ipc_reg.ipcx = SST_IPCX + ctx->pdata->ipc_info->ipc_offset;
 276         ctx->ipc_reg.ipcd = SST_IPCD + ctx->pdata->ipc_info->ipc_offset;
 277
 278         dev_info(ctx->dev, "Got drv data max stream %d\n",
 279                                 ctx->info.max_streams);
 280
 281         for (i = 1; i <= ctx->info.max_streams; i++) {
 282                 struct stream_info *stream = &ctx->streams[i];
 283
 284                 memset(stream, 0, sizeof(*stream));
 285                 stream->pipe_id = PIPE_RSVD;
 286                 mutex_init(&stream->lock);
 287         }
 288
 289         /* Register the ISR */
 290         ret = devm_request_threaded_irq(ctx->dev, ctx->irq_num, ctx->ops->interrupt,
 291                                         ctx->ops->irq_thread, 0, SST_DRV_NAME,
 292                                         ctx);
 293         if (ret)
 294                 goto do_free_mem;
 295
 296         dev_dbg(ctx->dev, "Registered IRQ %#x\n", ctx->irq_num);
 297
 298         /* default intr are unmasked so set this as masked */
 299         sst_shim_write64(ctx->shim, SST_IMRX, 0xFFFF0038);
 300
 301         ctx->qos = devm_kzalloc(ctx->dev,
 302                 sizeof(struct pm_qos_request), GFP_KERNEL);
 303         if (!ctx->qos) {
 304                 ret = -ENOMEM;
 305                 goto do_free_mem;
 306         }
 307         pm_qos_add_request(ctx->qos, PM_QOS_CPU_DMA_LATENCY,
 308                                 PM_QOS_DEFAULT_VALUE);
 309
 310         dev_dbg(ctx->dev, "Requesting FW %s now...\n", ctx->firmware_name);
 311         ret = request_firmware_nowait(THIS_MODULE, true, ctx->firmware_name,
 312                                       ctx->dev, GFP_KERNEL, ctx, sst_firmware_load_cb);
 313         if (ret) {
 314                 dev_err(ctx->dev, "Firmware download failed:%d\n", ret);
 315                 goto do_free_mem;
 316         }
 317         sst_register(ctx->dev);
 318         return 0;
 319
 320 do_free_mem:
 321         destroy_workqueue(ctx->post_msg_wq);
 322         return ret;
 323 }
 324 EXPORT_SYMBOL_GPL(sst_context_init);
 325
 326 void sst_context_cleanup(struct intel_sst_drv *ctx)
 327 {
 328         pm_runtime_get_noresume(ctx->dev);
 329         pm_runtime_disable(ctx->dev);
 330         sst_unregister(ctx->dev);
 331         sst_set_fw_state_locked(ctx, SST_SHUTDOWN);
 332         flush_scheduled_work();
 333         destroy_workqueue(ctx->post_msg_wq);
 334         pm_qos_remove_request(ctx->qos);
 335         kfree(ctx->fw_sg_list.src);
 336         kfree(ctx->fw_sg_list.dst);
 337         ctx->fw_sg_list.list_len = 0;
 338         kfree(ctx->fw_in_mem);
 339         ctx->fw_in_mem = NULL;
 340         sst_memcpy_free_resources(ctx);
 341         ctx = NULL;
 342 }
 343 EXPORT_SYMBOL_GPL(sst_context_cleanup);
 344
 345 static inline void sst_save_shim64(struct intel_sst_drv *ctx,
 346                             void __iomem *shim,
 347                             struct sst_shim_regs64 *shim_regs)
 348 {
 349         unsigned long irq_flags;
 350
 351         spin_lock_irqsave(&ctx->ipc_spin_lock, irq_flags);
 352
 353         shim_regs->imrx = sst_shim_read64(shim, SST_IMRX),
 354
 355         spin_unlock_irqrestore(&ctx->ipc_spin_lock, irq_flags);
 356 }
 357
 358 static inline void sst_restore_shim64(struct intel_sst_drv *ctx,
 359                                       void __iomem *shim,
 360                                       struct sst_shim_regs64 *shim_regs)
 361 {
 362         unsigned long irq_flags;
 363
 364         /*
 365          * we only need to restore IMRX for this case, rest will be
 366          * initialize by FW or driver when firmware is loaded
 367          */
 368         spin_lock_irqsave(&ctx->ipc_spin_lock, irq_flags);
 369         sst_shim_write64(shim, SST_IMRX, shim_regs->imrx),
 370         spin_unlock_irqrestore(&ctx->ipc_spin_lock, irq_flags);
 371 }
 372
 373 void sst_configure_runtime_pm(struct intel_sst_drv *ctx)
 374 {
 375         pm_runtime_set_autosuspend_delay(ctx->dev, SST_SUSPEND_DELAY);
 376         pm_runtime_use_autosuspend(ctx->dev);
 377         /*
 378          * For acpi devices, the actual physical device state is
 379          * initially active. So change the state to active before
 380          * enabling the pm
 381          */
 382         pm_runtime_enable(ctx->dev);
 383
 384         if (acpi_disabled)
 385                 pm_runtime_set_active(ctx->dev);
 386         else
 387                 pm_runtime_put_noidle(ctx->dev);
 388
 389         sst_save_shim64(ctx, ctx->shim, ctx->shim_regs64);
 390 }
 391 EXPORT_SYMBOL_GPL(sst_configure_runtime_pm);
 392
 393 static int intel_sst_runtime_suspend(struct device *dev)
 394 {
 395         int ret = 0;
 396         struct intel_sst_drv *ctx = dev_get_drvdata(dev);
 397
 398         if (ctx->sst_state == SST_RESET) {
 399                 dev_dbg(dev, "LPE is already in RESET state, No action\n");
 400                 return 0;
 401         }
 402         /* save fw context */
 403         if (ctx->ops->save_dsp_context(ctx))
 404                 return -EBUSY;
 405
 406         /* Move the SST state to Reset */
 407         sst_set_fw_state_locked(ctx, SST_RESET);
 408
 409         synchronize_irq(ctx->irq_num);
 410         flush_workqueue(ctx->post_msg_wq);
 411
 412         /* save the shim registers because PMC doesn't save state */
 413         sst_save_shim64(ctx, ctx->shim, ctx->shim_regs64);
 414
 415         return ret;
 416 }
 417
 418 static int intel_sst_runtime_resume(struct device *dev)
 419 {
 420         int ret = 0;
 421         struct intel_sst_drv *ctx = dev_get_drvdata(dev);
 422
 423         if (ctx->sst_state == SST_RESET) {
 424                 ret = sst_load_fw(ctx);
 425                 if (ret) {
 426                         dev_err(dev, "FW download fail %d\n", ret);
 427                         sst_set_fw_state_locked(ctx, SST_RESET);
 428                 }
 429         }
 430         return ret;
 431 }
 432
 433 const struct dev_pm_ops intel_sst_pm = {
 434         .runtime_suspend = intel_sst_runtime_suspend,
 435         .runtime_resume = intel_sst_runtime_resume,
 436 };
 437 EXPORT_SYMBOL_GPL(intel_sst_pm);