sound/soc/sof/intel/hda-ipc.c

   1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
   2 //
   3 // This file is provided under a dual BSD/GPLv2 license.  When using or
   4 // redistributing this file, you may do so under either license.
   5 //
   6 // Copyright(c) 2018 Intel Corporation. All rights reserved.
   7 //
   8 // Authors: Liam Girdwood <liam.r.girdwood@linux.intel.com>
   9 //          Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
  10 //          Rander Wang <rander.wang@intel.com>
  11 //          Keyon Jie <yang.jie@linux.intel.com>
  12 //
  13
  14 /*
  15  * Hardware interface for generic Intel audio DSP HDA IP
  16  */
  17
  18 #include "../ops.h"
  19 #include "hda.h"
  20
  21 static void hda_dsp_ipc_host_done(struct snd_sof_dev *sdev)
  22 {
  23         /*
  24          * tell DSP cmd is done - clear busy
  25          * interrupt and send reply msg to dsp
  26          */
  27         snd_sof_dsp_update_bits_forced(sdev, HDA_DSP_BAR,
  28                                        HDA_DSP_REG_HIPCT,
  29                                        HDA_DSP_REG_HIPCT_BUSY,
  30                                        HDA_DSP_REG_HIPCT_BUSY);
  31
  32         /* unmask BUSY interrupt */
  33         snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR,
  34                                 HDA_DSP_REG_HIPCCTL,
  35                                 HDA_DSP_REG_HIPCCTL_BUSY,
  36                                 HDA_DSP_REG_HIPCCTL_BUSY);
  37 }
  38
  39 static void hda_dsp_ipc_dsp_done(struct snd_sof_dev *sdev)
  40 {
  41         /*
  42          * set DONE bit - tell DSP we have received the reply msg
  43          * from DSP, and processed it, don't send more reply to host
  44          */
  45         snd_sof_dsp_update_bits_forced(sdev, HDA_DSP_BAR,
  46                                        HDA_DSP_REG_HIPCIE,
  47                                        HDA_DSP_REG_HIPCIE_DONE,
  48                                        HDA_DSP_REG_HIPCIE_DONE);
  49
  50         /* unmask Done interrupt */
  51         snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR,
  52                                 HDA_DSP_REG_HIPCCTL,
  53                                 HDA_DSP_REG_HIPCCTL_DONE,
  54                                 HDA_DSP_REG_HIPCCTL_DONE);
  55 }
  56
  57 int hda_dsp_ipc_send_msg(struct snd_sof_dev *sdev, struct snd_sof_ipc_msg *msg)
  58 {
  59         /* send IPC message to DSP */
  60         sof_mailbox_write(sdev, sdev->host_box.offset, msg->msg_data,
  61                           msg->msg_size);
  62         snd_sof_dsp_write(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCI,
  63                           HDA_DSP_REG_HIPCI_BUSY);
  64
  65         return 0;
  66 }
  67
  68 void hda_dsp_ipc_get_reply(struct snd_sof_dev *sdev)
  69 {
  70         struct snd_sof_ipc_msg *msg = sdev->msg;
  71         struct sof_ipc_reply reply;
  72         struct sof_ipc_cmd_hdr *hdr;
  73         int ret = 0;
  74
  75         /*
  76          * Sometimes, there is unexpected reply ipc arriving. The reply
  77          * ipc belongs to none of the ipcs sent from driver.
  78          * In this case, the driver must ignore the ipc.
  79          */
  80         if (!msg) {
  81                 dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
  82                 return;
  83         }
  84
  85         hdr = msg->msg_data;
  86         if (hdr->cmd == (SOF_IPC_GLB_PM_MSG | SOF_IPC_PM_CTX_SAVE) ||
  87             hdr->cmd == (SOF_IPC_GLB_PM_MSG | SOF_IPC_PM_GATE)) {
  88                 /*
  89                  * memory windows are powered off before sending IPC reply,
  90                  * so we can't read the mailbox for CTX_SAVE and PM_GATE
  91                  * replies.
  92                  */
  93                 reply.error = 0;
  94                 reply.hdr.cmd = SOF_IPC_GLB_REPLY;
  95                 reply.hdr.size = sizeof(reply);
  96                 memcpy(msg->reply_data, &reply, sizeof(reply));
  97                 goto out;
  98         }
  99
 100         /* get IPC reply from DSP in the mailbox */
 101         sof_mailbox_read(sdev, sdev->host_box.offset, &reply,
 102                          sizeof(reply));
 103
 104         if (reply.error < 0) {
 105                 memcpy(msg->reply_data, &reply, sizeof(reply));
 106                 ret = reply.error;
 107         } else {
 108                 /* reply correct size ? */
 109                 if (reply.hdr.size != msg->reply_size &&
 110                         /* getter payload is never known upfront */
 111                         !(reply.hdr.cmd & SOF_IPC_GLB_PROBE)) {
 112                         dev_err(sdev->dev, "error: reply expected %zu got %u bytes\n",
 113                                 msg->reply_size, reply.hdr.size);
 114                         ret = -EINVAL;
 115                 }
 116
 117                 /* read the message */
 118                 if (msg->reply_size > 0)
 119                         sof_mailbox_read(sdev, sdev->host_box.offset,
 120                                          msg->reply_data, msg->reply_size);
 121         }
 122
 123 out:
 124         msg->reply_error = ret;
 125
 126 }
 127
 128 /* IPC handler thread */
 129 irqreturn_t hda_dsp_ipc_irq_thread(int irq, void *context)
 130 {
 131         struct snd_sof_dev *sdev = context;
 132         u32 hipci;
 133         u32 hipcie;
 134         u32 hipct;
 135         u32 hipcte;
 136         u32 msg;
 137         u32 msg_ext;
 138         bool ipc_irq = false;
 139
 140         /* read IPC status */
 141         hipcie = snd_sof_dsp_read(sdev, HDA_DSP_BAR,
 142                                   HDA_DSP_REG_HIPCIE);
 143         hipct = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCT);
 144         hipci = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCI);
 145         hipcte = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCTE);
 146
 147         /* is this a reply message from the DSP */
 148         if (hipcie & HDA_DSP_REG_HIPCIE_DONE) {
 149                 msg = hipci & HDA_DSP_REG_HIPCI_MSG_MASK;
 150                 msg_ext = hipcie & HDA_DSP_REG_HIPCIE_MSG_MASK;
 151
 152                 dev_vdbg(sdev->dev,
 153                          "ipc: firmware response, msg:0x%x, msg_ext:0x%x\n",
 154                          msg, msg_ext);
 155
 156                 /* mask Done interrupt */
 157                 snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR,
 158                                         HDA_DSP_REG_HIPCCTL,
 159                                         HDA_DSP_REG_HIPCCTL_DONE, 0);
 160
 161                 /*
 162                  * Make sure the interrupt thread cannot be preempted between
 163                  * waking up the sender and re-enabling the interrupt. Also
 164                  * protect against a theoretical race with sof_ipc_tx_message():
 165                  * if the DSP is fast enough to receive an IPC message, reply to
 166                  * it, and the host interrupt processing calls this function on
 167                  * a different core from the one, where the sending is taking
 168                  * place, the message might not yet be marked as expecting a
 169                  * reply.
 170                  */
 171                 spin_lock_irq(&sdev->ipc_lock);
 172
 173                 /* handle immediate reply from DSP core */
 174                 hda_dsp_ipc_get_reply(sdev);
 175                 snd_sof_ipc_reply(sdev, msg);
 176
 177                 /* set the done bit */
 178                 hda_dsp_ipc_dsp_done(sdev);
 179
 180                 spin_unlock_irq(&sdev->ipc_lock);
 181
 182                 ipc_irq = true;
 183         }
 184
 185         /* is this a new message from DSP */
 186         if (hipct & HDA_DSP_REG_HIPCT_BUSY) {
 187                 msg = hipct & HDA_DSP_REG_HIPCT_MSG_MASK;
 188                 msg_ext = hipcte & HDA_DSP_REG_HIPCTE_MSG_MASK;
 189
 190                 dev_vdbg(sdev->dev,
 191                          "ipc: firmware initiated, msg:0x%x, msg_ext:0x%x\n",
 192                          msg, msg_ext);
 193
 194                 /* mask BUSY interrupt */
 195                 snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR,
 196                                         HDA_DSP_REG_HIPCCTL,
 197                                         HDA_DSP_REG_HIPCCTL_BUSY, 0);
 198
 199                 /* handle messages from DSP */
 200                 if ((hipct & SOF_IPC_PANIC_MAGIC_MASK) == SOF_IPC_PANIC_MAGIC) {
 201                         /* this is a PANIC message !! */
 202                         snd_sof_dsp_panic(sdev, HDA_DSP_PANIC_OFFSET(msg_ext));
 203                 } else {
 204                         /* normal message - process normally */
 205                         snd_sof_ipc_msgs_rx(sdev);
 206                 }
 207
 208                 hda_dsp_ipc_host_done(sdev);
 209
 210                 ipc_irq = true;
 211         }
 212
 213         if (!ipc_irq) {
 214                 /*
 215                  * This interrupt is not shared so no need to return IRQ_NONE.
 216                  */
 217                 dev_dbg_ratelimited(sdev->dev,
 218                                     "nothing to do in IPC IRQ thread\n");
 219         }
 220
 221         return IRQ_HANDLED;
 222 }
 223
 224 /* Check if an IPC IRQ occurred */
 225 bool hda_dsp_check_ipc_irq(struct snd_sof_dev *sdev)
 226 {
 227         bool ret = false;
 228         u32 irq_status;
 229
 230         /* store status */
 231         irq_status = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_ADSPIS);
 232         dev_vdbg(sdev->dev, "irq handler: irq_status:0x%x\n", irq_status);
 233
 234         /* invalid message ? */
 235         if (irq_status == 0xffffffff)
 236                 goto out;
 237
 238         /* IPC message ? */
 239         if (irq_status & HDA_DSP_ADSPIS_IPC)
 240                 ret = true;
 241
 242 out:
 243         return ret;
 244 }
 245
 246 int hda_dsp_ipc_get_mailbox_offset(struct snd_sof_dev *sdev)
 247 {
 248         return HDA_DSP_MBOX_UPLINK_OFFSET;
 249 }
 250
 251 int hda_dsp_ipc_get_window_offset(struct snd_sof_dev *sdev, u32 id)
 252 {
 253         return SRAM_WINDOW_OFFSET(id);
 254 }
 255
 256 void hda_ipc_msg_data(struct snd_sof_dev *sdev,
 257                       struct snd_pcm_substream *substream,
 258                       void *p, size_t sz)
 259 {
 260         if (!substream || !sdev->stream_box.size) {
 261                 sof_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
 262         } else {
 263                 struct hdac_stream *hstream = substream->runtime->private_data;
 264                 struct sof_intel_hda_stream *hda_stream;
 265
 266                 hda_stream = container_of(hstream,
 267                                           struct sof_intel_hda_stream,
 268                                           hda_stream.hstream);
 269
 270                 /* The stream might already be closed */
 271                 if (hstream)
 272                         sof_mailbox_read(sdev, hda_stream->stream.posn_offset,
 273                                          p, sz);
 274         }
 275 }
 276
 277 int hda_ipc_pcm_params(struct snd_sof_dev *sdev,
 278                        struct snd_pcm_substream *substream,
 279                        const struct sof_ipc_pcm_params_reply *reply)
 280 {
 281         struct hdac_stream *hstream = substream->runtime->private_data;
 282         struct sof_intel_hda_stream *hda_stream;
 283         /* validate offset */
 284         size_t posn_offset = reply->posn_offset;
 285
 286         hda_stream = container_of(hstream, struct sof_intel_hda_stream,
 287                                   hda_stream.hstream);
 288
 289         /* check for unaligned offset or overflow */
 290         if (posn_offset > sdev->stream_box.size ||
 291             posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
 292                 return -EINVAL;
 293
 294         hda_stream->stream.posn_offset = sdev->stream_box.offset + posn_offset;
 295
 296         dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
 297                 substream->stream, hda_stream->stream.posn_offset);
 298
 299         return 0;
 300 }