drivers/staging/intel_sst/intel_sst.c

   1 /*
   2  *  intel_sst.c - Intel SST Driver for audio engine
   3  *
   4  *  Copyright (C) 2008-10       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  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  *
  26  *  This driver exposes the audio engine functionalities to the ALSA
  27  *       and middleware.
  28  *
  29  *  This file contains all init functions
  30  */
  31
  32 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  33
  34 #include <linux/pci.h>
  35 #include <linux/fs.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/firmware.h>
  38 #include <linux/miscdevice.h>
  39 #include <linux/pm_runtime.h>
  40 #include <asm/mrst.h>
  41 #include "intel_sst.h"
  42 #include "intel_sst_ioctl.h"
  43 #include "intel_sst_fw_ipc.h"
  44 #include "intel_sst_common.h"
  45
  46
  47 MODULE_AUTHOR("Vinod Koul <vinod.koul@intel.com>");
  48 MODULE_AUTHOR("Harsha Priya <priya.harsha@intel.com>");
  49 MODULE_AUTHOR("Dharageswari R <dharageswari.r@intel.com>");
  50 MODULE_AUTHOR("KP Jeeja <jeeja.kp@intel.com>");
  51 MODULE_DESCRIPTION("Intel (R) SST(R) Audio Engine Driver");
  52 MODULE_LICENSE("GPL v2");
  53 MODULE_VERSION(SST_DRIVER_VERSION);
  54
  55 struct intel_sst_drv *sst_drv_ctx;
  56 static struct mutex drv_ctx_lock;
  57 struct class *sst_class;
  58
  59 /* fops Routines */
  60 static const struct file_operations intel_sst_fops = {
  61         .owner = THIS_MODULE,
  62         .open = intel_sst_open,
  63         .release = intel_sst_release,
  64         .read = intel_sst_read,
  65         .write = intel_sst_write,
  66         .unlocked_ioctl = intel_sst_ioctl,
  67         .mmap = intel_sst_mmap,
  68         .aio_read = intel_sst_aio_read,
  69         .aio_write = intel_sst_aio_write,
  70 };
  71 static const struct file_operations intel_sst_fops_cntrl = {
  72         .owner = THIS_MODULE,
  73         .open = intel_sst_open_cntrl,
  74         .release = intel_sst_release_cntrl,
  75         .unlocked_ioctl = intel_sst_ioctl,
  76 };
  77
  78 static struct miscdevice lpe_dev = {
  79         .minor = MISC_DYNAMIC_MINOR,/* dynamic allocation */
  80         .name = "intel_sst",/* /dev/intel_sst */
  81         .fops = &intel_sst_fops
  82 };
  83
  84
  85 static struct miscdevice lpe_ctrl = {
  86         .minor = MISC_DYNAMIC_MINOR,/* dynamic allocation */
  87         .name = "intel_sst_ctrl",/* /dev/intel_sst_ctrl */
  88         .fops = &intel_sst_fops_cntrl
  89 };
  90
  91 /**
  92 * intel_sst_interrupt - Interrupt service routine for SST
  93 *
  94 * @irq: irq number of interrupt
  95 * @context: pointer to device structre
  96 *
  97 * This function is called by OS when SST device raises
  98 * an interrupt. This will be result of write in IPC register
  99 * Source can be busy or done interrupt
 100 */
 101 static irqreturn_t intel_sst_interrupt(int irq, void *context)
 102 {
 103         union interrupt_reg isr;
 104         union ipc_header header;
 105         union interrupt_reg imr;
 106         struct intel_sst_drv *drv = (struct intel_sst_drv *) context;
 107         unsigned int size = 0, str_id;
 108         struct stream_info *stream ;
 109
 110         /* Do not handle interrupt in suspended state */
 111         if (drv->sst_state == SST_SUSPENDED)
 112                 return IRQ_NONE;
 113         /* Interrupt arrived, check src */
 114         isr.full = sst_shim_read(drv->shim, SST_ISRX);
 115
 116         if (isr.part.busy_interrupt) {
 117                 header.full = sst_shim_read(drv->shim, SST_IPCD);
 118                 if (header.part.msg_id == IPC_SST_PERIOD_ELAPSED) {
 119                         sst_clear_interrupt();
 120                         str_id = header.part.str_id;
 121                         stream = &sst_drv_ctx->streams[str_id];
 122                         if (stream->period_elapsed)
 123                                 stream->period_elapsed(stream->pcm_substream);
 124                         return IRQ_HANDLED;
 125                 }
 126                 if (header.part.large)
 127                         size = header.part.data;
 128                 if (header.part.msg_id & REPLY_MSG) {
 129                         sst_drv_ctx->ipc_process_msg.header = header;
 130                         memcpy_fromio(sst_drv_ctx->ipc_process_msg.mailbox,
 131                                 drv->mailbox + SST_MAILBOX_RCV, size);
 132                         queue_work(sst_drv_ctx->process_msg_wq,
 133                                         &sst_drv_ctx->ipc_process_msg.wq);
 134                 } else {
 135                         sst_drv_ctx->ipc_process_reply.header = header;
 136                         memcpy_fromio(sst_drv_ctx->ipc_process_reply.mailbox,
 137                                 drv->mailbox + SST_MAILBOX_RCV, size);
 138                         queue_work(sst_drv_ctx->process_reply_wq,
 139                                         &sst_drv_ctx->ipc_process_reply.wq);
 140                 }
 141                 /* mask busy inetrrupt */
 142                 imr.full = sst_shim_read(drv->shim, SST_IMRX);
 143                 imr.part.busy_interrupt = 1;
 144                 sst_shim_write(sst_drv_ctx->shim, SST_IMRX, imr.full);
 145                 return IRQ_HANDLED;
 146         } else if (isr.part.done_interrupt) {
 147                 /* Clear done bit */
 148                 header.full = sst_shim_read(drv->shim, SST_IPCX);
 149                 header.part.done = 0;
 150                 sst_shim_write(sst_drv_ctx->shim, SST_IPCX, header.full);
 151                 /* write 1 to clear status register */;
 152                 isr.part.done_interrupt = 1;
 153                 /* dummy register for shim workaround */
 154                 sst_shim_write(sst_drv_ctx->shim, SST_ISRX, isr.full);
 155                 queue_work(sst_drv_ctx->post_msg_wq,
 156                         &sst_drv_ctx->ipc_post_msg.wq);
 157                 return IRQ_HANDLED;
 158         } else
 159                 return IRQ_NONE;
 160
 161 }
 162
 163
 164 /*
 165 * intel_sst_probe - PCI probe function
 166 *
 167 * @pci: PCI device structure
 168 * @pci_id: PCI device ID structure
 169 *
 170 * This function is called by OS when a device is found
 171 * This enables the device, interrupt etc
 172 */
 173 static int __devinit intel_sst_probe(struct pci_dev *pci,
 174                         const struct pci_device_id *pci_id)
 175 {
 176         int i, ret = 0;
 177
 178         pr_debug("Probe for DID %x\n", pci->device);
 179         mutex_lock(&drv_ctx_lock);
 180         if (sst_drv_ctx) {
 181                 pr_err("Only one sst handle is supported\n");
 182                 mutex_unlock(&drv_ctx_lock);
 183                 return -EBUSY;
 184         }
 185
 186         sst_drv_ctx = kzalloc(sizeof(*sst_drv_ctx), GFP_KERNEL);
 187         if (!sst_drv_ctx) {
 188                 pr_err("malloc fail\n");
 189                 mutex_unlock(&drv_ctx_lock);
 190                 return -ENOMEM;
 191         }
 192         mutex_unlock(&drv_ctx_lock);
 193
 194         sst_drv_ctx->pci_id = pci->device;
 195
 196         mutex_init(&sst_drv_ctx->stream_lock);
 197         mutex_init(&sst_drv_ctx->sst_lock);
 198         sst_drv_ctx->pmic_state = SND_MAD_UN_INIT;
 199
 200         sst_drv_ctx->stream_cnt = 0;
 201         sst_drv_ctx->encoded_cnt = 0;
 202         sst_drv_ctx->am_cnt = 0;
 203         sst_drv_ctx->pb_streams = 0;
 204         sst_drv_ctx->cp_streams = 0;
 205         sst_drv_ctx->unique_id = 0;
 206         sst_drv_ctx->pmic_port_instance = SST_DEFAULT_PMIC_PORT;
 207
 208         INIT_LIST_HEAD(&sst_drv_ctx->ipc_dispatch_list);
 209         INIT_WORK(&sst_drv_ctx->ipc_post_msg.wq, sst_post_message);
 210         INIT_WORK(&sst_drv_ctx->ipc_process_msg.wq, sst_process_message);
 211         INIT_WORK(&sst_drv_ctx->ipc_process_reply.wq, sst_process_reply);
 212         INIT_WORK(&sst_drv_ctx->mad_ops.wq, sst_process_mad_ops);
 213         init_waitqueue_head(&sst_drv_ctx->wait_queue);
 214
 215         sst_drv_ctx->mad_wq = create_workqueue("sst_mad_wq");
 216         if (!sst_drv_ctx->mad_wq)
 217                 goto do_free_drv_ctx;
 218         sst_drv_ctx->post_msg_wq = create_workqueue("sst_post_msg_wq");
 219         if (!sst_drv_ctx->post_msg_wq)
 220                 goto free_mad_wq;
 221         sst_drv_ctx->process_msg_wq = create_workqueue("sst_process_msg_wqq");
 222         if (!sst_drv_ctx->process_msg_wq)
 223                 goto free_post_msg_wq;
 224         sst_drv_ctx->process_reply_wq = create_workqueue("sst_proces_reply_wq");
 225         if (!sst_drv_ctx->process_reply_wq)
 226                 goto free_process_msg_wq;
 227
 228         for (i = 0; i < MAX_ACTIVE_STREAM; i++) {
 229                 sst_drv_ctx->alloc_block[i].sst_id = BLOCK_UNINIT;
 230                 sst_drv_ctx->alloc_block[i].ops_block.condition = false;
 231         }
 232         spin_lock_init(&sst_drv_ctx->list_spin_lock);
 233
 234         sst_drv_ctx->max_streams = pci_id->driver_data;
 235         pr_debug("Got drv data max stream %d\n",
 236                                 sst_drv_ctx->max_streams);
 237         for (i = 1; i <= sst_drv_ctx->max_streams; i++) {
 238                 struct stream_info *stream = &sst_drv_ctx->streams[i];
 239                 INIT_LIST_HEAD(&stream->bufs);
 240                 mutex_init(&stream->lock);
 241                 spin_lock_init(&stream->pcm_lock);
 242         }
 243         if (sst_drv_ctx->pci_id == SST_MRST_PCI_ID) {
 244                 sst_drv_ctx->mmap_mem = NULL;
 245                 sst_drv_ctx->mmap_len = SST_MMAP_PAGES * PAGE_SIZE;
 246                 while (sst_drv_ctx->mmap_len > 0) {
 247                         sst_drv_ctx->mmap_mem =
 248                                 kzalloc(sst_drv_ctx->mmap_len, GFP_KERNEL);
 249                         if (sst_drv_ctx->mmap_mem) {
 250                                 pr_debug("Got memory %p size 0x%x\n",
 251                                         sst_drv_ctx->mmap_mem,
 252                                         sst_drv_ctx->mmap_len);
 253                                 break;
 254                         }
 255                         if (sst_drv_ctx->mmap_len < (SST_MMAP_STEP*PAGE_SIZE)) {
 256                                 pr_err("mem alloc fail...abort!!\n");
 257                                 ret = -ENOMEM;
 258                                 goto free_process_reply_wq;
 259                         }
 260                         sst_drv_ctx->mmap_len -= (SST_MMAP_STEP * PAGE_SIZE);
 261                         pr_debug("mem alloc failed...trying %d\n",
 262                                                 sst_drv_ctx->mmap_len);
 263                 }
 264         }
 265
 266         /* Init the device */
 267         ret = pci_enable_device(pci);
 268         if (ret) {
 269                 pr_err("device can't be enabled\n");
 270                 goto do_free_mem;
 271         }
 272         sst_drv_ctx->pci = pci_dev_get(pci);
 273         ret = pci_request_regions(pci, SST_DRV_NAME);
 274         if (ret)
 275                 goto do_disable_device;
 276         /* map registers */
 277         /* SST Shim */
 278         sst_drv_ctx->shim_phy_add = pci_resource_start(pci, 1);
 279         sst_drv_ctx->shim = pci_ioremap_bar(pci, 1);
 280         if (!sst_drv_ctx->shim)
 281                 goto do_release_regions;
 282         pr_debug("SST Shim Ptr %p\n", sst_drv_ctx->shim);
 283
 284         /* Shared SRAM */
 285         sst_drv_ctx->mailbox = pci_ioremap_bar(pci, 2);
 286         if (!sst_drv_ctx->mailbox)
 287                 goto do_unmap_shim;
 288         pr_debug("SRAM Ptr %p\n", sst_drv_ctx->mailbox);
 289
 290         /* IRAM */
 291         sst_drv_ctx->iram = pci_ioremap_bar(pci, 3);
 292         if (!sst_drv_ctx->iram)
 293                 goto do_unmap_sram;
 294         pr_debug("IRAM Ptr %p\n", sst_drv_ctx->iram);
 295
 296         /* DRAM */
 297         sst_drv_ctx->dram = pci_ioremap_bar(pci, 4);
 298         if (!sst_drv_ctx->dram)
 299                 goto do_unmap_iram;
 300         pr_debug("DRAM Ptr %p\n", sst_drv_ctx->dram);
 301
 302         mutex_lock(&sst_drv_ctx->sst_lock);
 303         sst_drv_ctx->sst_state = SST_UN_INIT;
 304         mutex_unlock(&sst_drv_ctx->sst_lock);
 305         /* Register the ISR */
 306         ret = request_irq(pci->irq, intel_sst_interrupt,
 307                 IRQF_SHARED, SST_DRV_NAME, sst_drv_ctx);
 308         if (ret)
 309                 goto do_unmap_dram;
 310         pr_debug("Registered IRQ 0x%x\n", pci->irq);
 311
 312         /*Register LPE Control as misc driver*/
 313         ret = misc_register(&lpe_ctrl);
 314         if (ret) {
 315                 pr_err("couldn't register control device\n");
 316                 goto do_free_irq;
 317         }
 318
 319         if (sst_drv_ctx->pci_id == SST_MRST_PCI_ID) {
 320                 ret = misc_register(&lpe_dev);
 321                 if (ret) {
 322                         pr_err("couldn't register LPE device\n");
 323                         goto do_free_misc;
 324                 }
 325         } else if (sst_drv_ctx->pci_id == SST_MFLD_PCI_ID) {
 326                 u32 csr;
 327
 328                 /*allocate mem for fw context save during suspend*/
 329                 sst_drv_ctx->fw_cntx = kzalloc(FW_CONTEXT_MEM, GFP_KERNEL);
 330                 if (!sst_drv_ctx->fw_cntx) {
 331                         ret = -ENOMEM;
 332                         goto do_free_misc;
 333                 }
 334                 /*setting zero as that is valid mem to restore*/
 335                 sst_drv_ctx->fw_cntx_size = 0;
 336
 337                 /*set lpe start clock and ram size*/
 338                 csr = sst_shim_read(sst_drv_ctx->shim, SST_CSR);
 339                 csr |= 0x30060; /*remove the clock ratio after fw fix*/
 340                 sst_shim_write(sst_drv_ctx->shim, SST_CSR, csr);
 341         }
 342         sst_drv_ctx->lpe_stalled = 0;
 343         pci_set_drvdata(pci, sst_drv_ctx);
 344         pm_runtime_allow(&pci->dev);
 345         pm_runtime_put_noidle(&pci->dev);
 346         pr_debug("...successfully done!!!\n");
 347         return ret;
 348
 349 do_free_misc:
 350         misc_deregister(&lpe_ctrl);
 351 do_free_irq:
 352         free_irq(pci->irq, sst_drv_ctx);
 353 do_unmap_dram:
 354         iounmap(sst_drv_ctx->dram);
 355 do_unmap_iram:
 356         iounmap(sst_drv_ctx->iram);
 357 do_unmap_sram:
 358         iounmap(sst_drv_ctx->mailbox);
 359 do_unmap_shim:
 360         iounmap(sst_drv_ctx->shim);
 361 do_release_regions:
 362         pci_release_regions(pci);
 363 do_disable_device:
 364         pci_disable_device(pci);
 365 do_free_mem:
 366         kfree(sst_drv_ctx->mmap_mem);
 367 free_process_reply_wq:
 368         destroy_workqueue(sst_drv_ctx->process_reply_wq);
 369 free_process_msg_wq:
 370         destroy_workqueue(sst_drv_ctx->process_msg_wq);
 371 free_post_msg_wq:
 372         destroy_workqueue(sst_drv_ctx->post_msg_wq);
 373 free_mad_wq:
 374         destroy_workqueue(sst_drv_ctx->mad_wq);
 375 do_free_drv_ctx:
 376         kfree(sst_drv_ctx);
 377         sst_drv_ctx = NULL;
 378         pr_err("Probe failed with %d\n", ret);
 379         return ret;
 380 }
 381
 382 /**
 383 * intel_sst_remove - PCI remove function
 384 *
 385 * @pci: PCI device structure
 386 *
 387 * This function is called by OS when a device is unloaded
 388 * This frees the interrupt etc
 389 */
 390 static void __devexit intel_sst_remove(struct pci_dev *pci)
 391 {
 392         pm_runtime_get_noresume(&pci->dev);
 393         pm_runtime_forbid(&pci->dev);
 394         pci_dev_put(sst_drv_ctx->pci);
 395         mutex_lock(&sst_drv_ctx->sst_lock);
 396         sst_drv_ctx->sst_state = SST_UN_INIT;
 397         mutex_unlock(&sst_drv_ctx->sst_lock);
 398         misc_deregister(&lpe_ctrl);
 399         free_irq(pci->irq, sst_drv_ctx);
 400         iounmap(sst_drv_ctx->dram);
 401         iounmap(sst_drv_ctx->iram);
 402         iounmap(sst_drv_ctx->mailbox);
 403         iounmap(sst_drv_ctx->shim);
 404         sst_drv_ctx->pmic_state = SND_MAD_UN_INIT;
 405         if (sst_drv_ctx->pci_id == SST_MRST_PCI_ID) {
 406                 misc_deregister(&lpe_dev);
 407                 kfree(sst_drv_ctx->mmap_mem);
 408         } else
 409                 kfree(sst_drv_ctx->fw_cntx);
 410         flush_scheduled_work();
 411         destroy_workqueue(sst_drv_ctx->process_reply_wq);
 412         destroy_workqueue(sst_drv_ctx->process_msg_wq);
 413         destroy_workqueue(sst_drv_ctx->post_msg_wq);
 414         destroy_workqueue(sst_drv_ctx->mad_wq);
 415         kfree(pci_get_drvdata(pci));
 416         sst_drv_ctx = NULL;
 417         pci_release_regions(pci);
 418         pci_disable_device(pci);
 419         pci_set_drvdata(pci, NULL);
 420 }
 421
 422 void sst_save_dsp_context(void)
 423 {
 424         struct snd_sst_ctxt_params fw_context;
 425         unsigned int pvt_id, i;
 426         struct ipc_post *msg = NULL;
 427
 428         /*check cpu type*/
 429         if (sst_drv_ctx->pci_id != SST_MFLD_PCI_ID)
 430                 return;
 431                 /*not supported for rest*/
 432         if (sst_drv_ctx->sst_state != SST_FW_RUNNING) {
 433                 pr_debug("fw not running no context save ...\n");
 434                 return;
 435         }
 436
 437         /*send msg to fw*/
 438         if (sst_create_large_msg(&msg))
 439                 return;
 440         pvt_id = sst_assign_pvt_id(sst_drv_ctx);
 441         i = sst_get_block_stream(sst_drv_ctx);
 442         sst_drv_ctx->alloc_block[i].sst_id = pvt_id;
 443         sst_fill_header(&msg->header, IPC_IA_GET_FW_CTXT, 1, pvt_id);
 444         msg->header.part.data = sizeof(fw_context) + sizeof(u32);
 445         fw_context.address = virt_to_phys((void *)sst_drv_ctx->fw_cntx);
 446         fw_context.size = FW_CONTEXT_MEM;
 447         memcpy(msg->mailbox_data, &msg->header, sizeof(u32));
 448         memcpy(msg->mailbox_data + sizeof(u32),
 449                                 &fw_context, sizeof(fw_context));
 450         spin_lock(&sst_drv_ctx->list_spin_lock);
 451         list_add_tail(&msg->node, &sst_drv_ctx->ipc_dispatch_list);
 452         spin_unlock(&sst_drv_ctx->list_spin_lock);
 453         sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
 454         /*wait for reply*/
 455         if (sst_wait_timeout(sst_drv_ctx, &sst_drv_ctx->alloc_block[i]))
 456                 pr_debug("err fw context save timeout  ...\n");
 457         sst_drv_ctx->alloc_block[i].sst_id = BLOCK_UNINIT;
 458         pr_debug("fw context saved  ...\n");
 459         return;
 460 }
 461
 462 /* Power Management */
 463 /*
 464 * intel_sst_suspend - PCI suspend function
 465 *
 466 * @pci: PCI device structure
 467 * @state: PM message
 468 *
 469 * This function is called by OS when a power event occurs
 470 */
 471 int intel_sst_suspend(struct pci_dev *pci, pm_message_t state)
 472 {
 473         union config_status_reg csr;
 474
 475         pr_debug("intel_sst_suspend called\n");
 476
 477         if (sst_drv_ctx->stream_cnt) {
 478                 pr_err("active streams,not able to suspend\n");
 479                 return -EBUSY;
 480         }
 481         /*save fw context*/
 482         sst_save_dsp_context();
 483         /*Assert RESET on LPE Processor*/
 484         csr.full = sst_shim_read(sst_drv_ctx->shim, SST_CSR);
 485         csr.full = csr.full | 0x2;
 486         /* Move the SST state to Suspended */
 487         mutex_lock(&sst_drv_ctx->sst_lock);
 488         sst_drv_ctx->sst_state = SST_SUSPENDED;
 489         sst_shim_write(sst_drv_ctx->shim, SST_CSR, csr.full);
 490         mutex_unlock(&sst_drv_ctx->sst_lock);
 491         pci_set_drvdata(pci, sst_drv_ctx);
 492         pci_save_state(pci);
 493         pci_disable_device(pci);
 494         pci_set_power_state(pci, PCI_D3hot);
 495         return 0;
 496 }
 497
 498 /**
 499 * intel_sst_resume - PCI resume function
 500 *
 501 * @pci: PCI device structure
 502 *
 503 * This function is called by OS when a power event occurs
 504 */
 505 int intel_sst_resume(struct pci_dev *pci)
 506 {
 507         int ret = 0;
 508
 509         pr_debug("intel_sst_resume called\n");
 510         if (sst_drv_ctx->sst_state != SST_SUSPENDED) {
 511                 pr_err("SST is not in suspended state\n");
 512                 return 0;
 513         }
 514         sst_drv_ctx = pci_get_drvdata(pci);
 515         pci_set_power_state(pci, PCI_D0);
 516         pci_restore_state(pci);
 517         ret = pci_enable_device(pci);
 518         if (ret)
 519                 pr_err("device can't be enabled\n");
 520
 521         mutex_lock(&sst_drv_ctx->sst_lock);
 522         sst_drv_ctx->sst_state = SST_UN_INIT;
 523         mutex_unlock(&sst_drv_ctx->sst_lock);
 524         return 0;
 525 }
 526
 527 /* The runtime_suspend/resume is pretty much similar to the legacy
 528  * suspend/resume with the noted exception below:
 529  * The PCI core takes care of taking the system through D3hot and
 530  * restoring it back to D0 and so there is no need to duplicate
 531  * that here.
 532  */
 533 static int intel_sst_runtime_suspend(struct device *dev)
 534 {
 535         union config_status_reg csr;
 536
 537         pr_debug("intel_sst_runtime_suspend called\n");
 538         if (sst_drv_ctx->stream_cnt) {
 539                 pr_err("active streams,not able to suspend\n");
 540                 return -EBUSY;
 541         }
 542         /*save fw context*/
 543         sst_save_dsp_context();
 544         /*Assert RESET on LPE Processor*/
 545         csr.full = sst_shim_read(sst_drv_ctx->shim, SST_CSR);
 546         csr.full = csr.full | 0x2;
 547         /* Move the SST state to Suspended */
 548         mutex_lock(&sst_drv_ctx->sst_lock);
 549         sst_drv_ctx->sst_state = SST_SUSPENDED;
 550
 551         /* Only needed by Medfield */
 552         if (sst_drv_ctx->pci_id != SST_MRST_PCI_ID)
 553                 sst_shim_write(sst_drv_ctx->shim, SST_CSR, csr.full);
 554         mutex_unlock(&sst_drv_ctx->sst_lock);
 555         return 0;
 556 }
 557
 558 static int intel_sst_runtime_resume(struct device *dev)
 559 {
 560
 561         pr_debug("intel_sst_runtime_resume called\n");
 562         if (sst_drv_ctx->sst_state != SST_SUSPENDED) {
 563                 pr_err("SST is not in suspended state\n");
 564                 return 0;
 565         }
 566
 567         mutex_lock(&sst_drv_ctx->sst_lock);
 568         sst_drv_ctx->sst_state = SST_UN_INIT;
 569         mutex_unlock(&sst_drv_ctx->sst_lock);
 570         return 0;
 571 }
 572
 573 static int intel_sst_runtime_idle(struct device *dev)
 574 {
 575         pr_debug("runtime_idle called\n");
 576         if (sst_drv_ctx->stream_cnt == 0 && sst_drv_ctx->am_cnt == 0)
 577                 pm_schedule_suspend(dev, SST_SUSPEND_DELAY);
 578         return -EBUSY;
 579 }
 580
 581 static const struct dev_pm_ops intel_sst_pm = {
 582         .runtime_suspend = intel_sst_runtime_suspend,
 583         .runtime_resume = intel_sst_runtime_resume,
 584         .runtime_idle = intel_sst_runtime_idle,
 585 };
 586
 587 /* PCI Routines */
 588 static struct pci_device_id intel_sst_ids[] = {
 589         { PCI_VDEVICE(INTEL, SST_MRST_PCI_ID), 3},
 590         { PCI_VDEVICE(INTEL, SST_MFLD_PCI_ID), 6},
 591         { 0, }
 592 };
 593 MODULE_DEVICE_TABLE(pci, intel_sst_ids);
 594
 595 static struct pci_driver driver = {
 596         .name = SST_DRV_NAME,
 597         .id_table = intel_sst_ids,
 598         .probe = intel_sst_probe,
 599         .remove = __devexit_p(intel_sst_remove),
 600 #ifdef CONFIG_PM
 601         .suspend = intel_sst_suspend,
 602         .resume = intel_sst_resume,
 603         .driver = {
 604                 .pm = &intel_sst_pm,
 605         },
 606 #endif
 607 };
 608
 609 /**
 610 * intel_sst_init - Module init function
 611 *
 612 * Registers with PCI
 613 * Registers with /dev
 614 * Init all data strutures
 615 */
 616 static int __init intel_sst_init(void)
 617 {
 618         /* Init all variables, data structure etc....*/
 619         int ret = 0;
 620         pr_debug("INFO: ******** SST DRIVER loading.. Ver: %s\n",
 621                                        SST_DRIVER_VERSION);
 622
 623         mutex_init(&drv_ctx_lock);
 624         /* Register with PCI */
 625         ret = pci_register_driver(&driver);
 626         if (ret)
 627                 pr_err("PCI register failed\n");
 628         return ret;
 629 }
 630
 631 /**
 632 * intel_sst_exit - Module exit function
 633 *
 634 * Unregisters with PCI
 635 * Unregisters with /dev
 636 * Frees all data strutures
 637 */
 638 static void __exit intel_sst_exit(void)
 639 {
 640         pci_unregister_driver(&driver);
 641
 642         pr_debug("driver unloaded\n");
 643         sst_drv_ctx = NULL;
 644         return;
 645 }
 646
 647 module_init(intel_sst_init);
 648 module_exit(intel_sst_exit);