drivers/slimbus/qcom-ngd-ctrl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2011-2017, The Linux Foundation. All rights reserved.
   3 // Copyright (c) 2018, Linaro Limited
   4
   5 #include <linux/irq.h>
   6 #include <linux/kernel.h>
   7 #include <linux/init.h>
   8 #include <linux/slab.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/dma-mapping.h>
  12 #include <linux/dmaengine.h>
  13 #include <linux/slimbus.h>
  14 #include <linux/delay.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/mutex.h>
  17 #include <linux/notifier.h>
  18 #include <linux/remoteproc/qcom_rproc.h>
  19 #include <linux/of.h>
  20 #include <linux/io.h>
  21 #include <linux/soc/qcom/qmi.h>
  22 #include <linux/soc/qcom/pdr.h>
  23 #include <net/sock.h>
  24 #include "slimbus.h"
  25
  26 /* NGD (Non-ported Generic Device) registers */
  27 #define NGD_CFG                 0x0
  28 #define NGD_CFG_ENABLE          BIT(0)
  29 #define NGD_CFG_RX_MSGQ_EN      BIT(1)
  30 #define NGD_CFG_TX_MSGQ_EN      BIT(2)
  31 #define NGD_STATUS              0x4
  32 #define NGD_LADDR               BIT(1)
  33 #define NGD_RX_MSGQ_CFG         0x8
  34 #define NGD_INT_EN              0x10
  35 #define NGD_INT_RECFG_DONE      BIT(24)
  36 #define NGD_INT_TX_NACKED_2     BIT(25)
  37 #define NGD_INT_MSG_BUF_CONTE   BIT(26)
  38 #define NGD_INT_MSG_TX_INVAL    BIT(27)
  39 #define NGD_INT_IE_VE_CHG       BIT(28)
  40 #define NGD_INT_DEV_ERR         BIT(29)
  41 #define NGD_INT_RX_MSG_RCVD     BIT(30)
  42 #define NGD_INT_TX_MSG_SENT     BIT(31)
  43 #define NGD_INT_STAT            0x14
  44 #define NGD_INT_CLR             0x18
  45 #define DEF_NGD_INT_MASK (NGD_INT_TX_NACKED_2 | NGD_INT_MSG_BUF_CONTE | \
  46                                 NGD_INT_MSG_TX_INVAL | NGD_INT_IE_VE_CHG | \
  47                                 NGD_INT_DEV_ERR | NGD_INT_TX_MSG_SENT | \
  48                                 NGD_INT_RX_MSG_RCVD)
  49
  50 /* Slimbus QMI service */
  51 #define SLIMBUS_QMI_SVC_ID      0x0301
  52 #define SLIMBUS_QMI_SVC_V1      1
  53 #define SLIMBUS_QMI_INS_ID      0
  54 #define SLIMBUS_QMI_SELECT_INSTANCE_REQ_V01     0x0020
  55 #define SLIMBUS_QMI_SELECT_INSTANCE_RESP_V01    0x0020
  56 #define SLIMBUS_QMI_POWER_REQ_V01               0x0021
  57 #define SLIMBUS_QMI_POWER_RESP_V01              0x0021
  58 #define SLIMBUS_QMI_CHECK_FRAMER_STATUS_REQ     0x0022
  59 #define SLIMBUS_QMI_CHECK_FRAMER_STATUS_RESP    0x0022
  60 #define SLIMBUS_QMI_POWER_REQ_MAX_MSG_LEN       14
  61 #define SLIMBUS_QMI_POWER_RESP_MAX_MSG_LEN      7
  62 #define SLIMBUS_QMI_SELECT_INSTANCE_REQ_MAX_MSG_LEN     14
  63 #define SLIMBUS_QMI_SELECT_INSTANCE_RESP_MAX_MSG_LEN    7
  64 #define SLIMBUS_QMI_CHECK_FRAMER_STAT_RESP_MAX_MSG_LEN  7
  65 /* QMI response timeout of 500ms */
  66 #define SLIMBUS_QMI_RESP_TOUT   1000
  67
  68 /* User defined commands */
  69 #define SLIM_USR_MC_GENERIC_ACK 0x25
  70 #define SLIM_USR_MC_MASTER_CAPABILITY   0x0
  71 #define SLIM_USR_MC_REPORT_SATELLITE    0x1
  72 #define SLIM_USR_MC_ADDR_QUERY          0xD
  73 #define SLIM_USR_MC_ADDR_REPLY          0xE
  74 #define SLIM_USR_MC_DEFINE_CHAN         0x20
  75 #define SLIM_USR_MC_DEF_ACT_CHAN        0x21
  76 #define SLIM_USR_MC_CHAN_CTRL           0x23
  77 #define SLIM_USR_MC_RECONFIG_NOW        0x24
  78 #define SLIM_USR_MC_REQ_BW              0x28
  79 #define SLIM_USR_MC_CONNECT_SRC         0x2C
  80 #define SLIM_USR_MC_CONNECT_SINK        0x2D
  81 #define SLIM_USR_MC_DISCONNECT_PORT     0x2E
  82 #define SLIM_USR_MC_REPEAT_CHANGE_VALUE 0x0
  83
  84 #define QCOM_SLIM_NGD_AUTOSUSPEND       MSEC_PER_SEC
  85 #define SLIM_RX_MSGQ_TIMEOUT_VAL        0x10000
  86
  87 #define SLIM_LA_MGR     0xFF
  88 #define SLIM_ROOT_FREQ  24576000
  89 #define LADDR_RETRY     5
  90
  91 /* Per spec.max 40 bytes per received message */
  92 #define SLIM_MSGQ_BUF_LEN       40
  93 #define QCOM_SLIM_NGD_DESC_NUM  32
  94
  95 #define SLIM_MSG_ASM_FIRST_WORD(l, mt, mc, dt, ad) \
  96                 ((l) | ((mt) << 5) | ((mc) << 8) | ((dt) << 15) | ((ad) << 16))
  97
  98 #define INIT_MX_RETRIES 10
  99 #define DEF_RETRY_MS    10
 100 #define SAT_MAGIC_LSB   0xD9
 101 #define SAT_MAGIC_MSB   0xC5
 102 #define SAT_MSG_VER     0x1
 103 #define SAT_MSG_PROT    0x1
 104 #define to_ngd(d)       container_of(d, struct qcom_slim_ngd, dev)
 105
 106 struct ngd_reg_offset_data {
 107         u32 offset, size;
 108 };
 109
 110 static const struct ngd_reg_offset_data ngd_v1_5_offset_info = {
 111         .offset = 0x1000,
 112         .size = 0x1000,
 113 };
 114
 115 enum qcom_slim_ngd_state {
 116         QCOM_SLIM_NGD_CTRL_AWAKE,
 117         QCOM_SLIM_NGD_CTRL_IDLE,
 118         QCOM_SLIM_NGD_CTRL_ASLEEP,
 119         QCOM_SLIM_NGD_CTRL_DOWN,
 120 };
 121
 122 struct qcom_slim_ngd_qmi {
 123         struct qmi_handle qmi;
 124         struct sockaddr_qrtr svc_info;
 125         struct qmi_handle svc_event_hdl;
 126         struct qmi_response_type_v01 resp;
 127         struct qmi_handle *handle;
 128         struct completion qmi_comp;
 129 };
 130
 131 struct qcom_slim_ngd_ctrl;
 132 struct qcom_slim_ngd;
 133
 134 struct qcom_slim_ngd_dma_desc {
 135         struct dma_async_tx_descriptor *desc;
 136         struct qcom_slim_ngd_ctrl *ctrl;
 137         struct completion *comp;
 138         dma_cookie_t cookie;
 139         dma_addr_t phys;
 140         void *base;
 141 };
 142
 143 struct qcom_slim_ngd {
 144         struct platform_device *pdev;
 145         void __iomem *base;
 146         int id;
 147 };
 148
 149 struct qcom_slim_ngd_ctrl {
 150         struct slim_framer framer;
 151         struct slim_controller ctrl;
 152         struct qcom_slim_ngd_qmi qmi;
 153         struct qcom_slim_ngd *ngd;
 154         struct device *dev;
 155         void __iomem *base;
 156         struct dma_chan *dma_rx_channel;
 157         struct dma_chan *dma_tx_channel;
 158         struct qcom_slim_ngd_dma_desc rx_desc[QCOM_SLIM_NGD_DESC_NUM];
 159         struct qcom_slim_ngd_dma_desc txdesc[QCOM_SLIM_NGD_DESC_NUM];
 160         struct completion reconf;
 161         struct work_struct m_work;
 162         struct work_struct ngd_up_work;
 163         struct workqueue_struct *mwq;
 164         struct completion qmi_up;
 165         spinlock_t tx_buf_lock;
 166         struct mutex tx_lock;
 167         struct mutex ssr_lock;
 168         struct notifier_block nb;
 169         void *notifier;
 170         struct pdr_handle *pdr;
 171         enum qcom_slim_ngd_state state;
 172         dma_addr_t rx_phys_base;
 173         dma_addr_t tx_phys_base;
 174         void *rx_base;
 175         void *tx_base;
 176         int tx_tail;
 177         int tx_head;
 178         u32 ver;
 179 };
 180
 181 enum slimbus_mode_enum_type_v01 {
 182         /* To force a 32 bit signed enum. Do not change or use*/
 183         SLIMBUS_MODE_ENUM_TYPE_MIN_ENUM_VAL_V01 = INT_MIN,
 184         SLIMBUS_MODE_SATELLITE_V01 = 1,
 185         SLIMBUS_MODE_MASTER_V01 = 2,
 186         SLIMBUS_MODE_ENUM_TYPE_MAX_ENUM_VAL_V01 = INT_MAX,
 187 };
 188
 189 enum slimbus_pm_enum_type_v01 {
 190         /* To force a 32 bit signed enum. Do not change or use*/
 191         SLIMBUS_PM_ENUM_TYPE_MIN_ENUM_VAL_V01 = INT_MIN,
 192         SLIMBUS_PM_INACTIVE_V01 = 1,
 193         SLIMBUS_PM_ACTIVE_V01 = 2,
 194         SLIMBUS_PM_ENUM_TYPE_MAX_ENUM_VAL_V01 = INT_MAX,
 195 };
 196
 197 enum slimbus_resp_enum_type_v01 {
 198         SLIMBUS_RESP_ENUM_TYPE_MIN_VAL_V01 = INT_MIN,
 199         SLIMBUS_RESP_SYNCHRONOUS_V01 = 1,
 200         SLIMBUS_RESP_ENUM_TYPE_MAX_VAL_V01 = INT_MAX,
 201 };
 202
 203 struct slimbus_select_inst_req_msg_v01 {
 204         uint32_t instance;
 205         uint8_t mode_valid;
 206         enum slimbus_mode_enum_type_v01 mode;
 207 };
 208
 209 struct slimbus_select_inst_resp_msg_v01 {
 210         struct qmi_response_type_v01 resp;
 211 };
 212
 213 struct slimbus_power_req_msg_v01 {
 214         enum slimbus_pm_enum_type_v01 pm_req;
 215         uint8_t resp_type_valid;
 216         enum slimbus_resp_enum_type_v01 resp_type;
 217 };
 218
 219 struct slimbus_power_resp_msg_v01 {
 220         struct qmi_response_type_v01 resp;
 221 };
 222
 223 static struct qmi_elem_info slimbus_select_inst_req_msg_v01_ei[] = {
 224         {
 225                 .data_type  = QMI_UNSIGNED_4_BYTE,
 226                 .elem_len   = 1,
 227                 .elem_size  = sizeof(uint32_t),
 228                 .array_type = NO_ARRAY,
 229                 .tlv_type   = 0x01,
 230                 .offset     = offsetof(struct slimbus_select_inst_req_msg_v01,
 231                                        instance),
 232                 .ei_array   = NULL,
 233         },
 234         {
 235                 .data_type  = QMI_OPT_FLAG,
 236                 .elem_len   = 1,
 237                 .elem_size  = sizeof(uint8_t),
 238                 .array_type = NO_ARRAY,
 239                 .tlv_type   = 0x10,
 240                 .offset     = offsetof(struct slimbus_select_inst_req_msg_v01,
 241                                        mode_valid),
 242                 .ei_array   = NULL,
 243         },
 244         {
 245                 .data_type  = QMI_UNSIGNED_4_BYTE,
 246                 .elem_len   = 1,
 247                 .elem_size  = sizeof(enum slimbus_mode_enum_type_v01),
 248                 .array_type = NO_ARRAY,
 249                 .tlv_type   = 0x10,
 250                 .offset     = offsetof(struct slimbus_select_inst_req_msg_v01,
 251                                        mode),
 252                 .ei_array   = NULL,
 253         },
 254         {
 255                 .data_type  = QMI_EOTI,
 256                 .elem_len   = 0,
 257                 .elem_size  = 0,
 258                 .array_type = NO_ARRAY,
 259                 .tlv_type   = 0x00,
 260                 .offset     = 0,
 261                 .ei_array   = NULL,
 262         },
 263 };
 264
 265 static struct qmi_elem_info slimbus_select_inst_resp_msg_v01_ei[] = {
 266         {
 267                 .data_type  = QMI_STRUCT,
 268                 .elem_len   = 1,
 269                 .elem_size  = sizeof(struct qmi_response_type_v01),
 270                 .array_type = NO_ARRAY,
 271                 .tlv_type   = 0x02,
 272                 .offset     = offsetof(struct slimbus_select_inst_resp_msg_v01,
 273                                        resp),
 274                 .ei_array   = qmi_response_type_v01_ei,
 275         },
 276         {
 277                 .data_type  = QMI_EOTI,
 278                 .elem_len   = 0,
 279                 .elem_size  = 0,
 280                 .array_type = NO_ARRAY,
 281                 .tlv_type   = 0x00,
 282                 .offset     = 0,
 283                 .ei_array   = NULL,
 284         },
 285 };
 286
 287 static struct qmi_elem_info slimbus_power_req_msg_v01_ei[] = {
 288         {
 289                 .data_type  = QMI_UNSIGNED_4_BYTE,
 290                 .elem_len   = 1,
 291                 .elem_size  = sizeof(enum slimbus_pm_enum_type_v01),
 292                 .array_type = NO_ARRAY,
 293                 .tlv_type   = 0x01,
 294                 .offset     = offsetof(struct slimbus_power_req_msg_v01,
 295                                        pm_req),
 296                 .ei_array   = NULL,
 297         },
 298         {
 299                 .data_type  = QMI_OPT_FLAG,
 300                 .elem_len   = 1,
 301                 .elem_size  = sizeof(uint8_t),
 302                 .array_type = NO_ARRAY,
 303                 .tlv_type   = 0x10,
 304                 .offset     = offsetof(struct slimbus_power_req_msg_v01,
 305                                        resp_type_valid),
 306         },
 307         {
 308                 .data_type  = QMI_SIGNED_4_BYTE_ENUM,
 309                 .elem_len   = 1,
 310                 .elem_size  = sizeof(enum slimbus_resp_enum_type_v01),
 311                 .array_type = NO_ARRAY,
 312                 .tlv_type   = 0x10,
 313                 .offset     = offsetof(struct slimbus_power_req_msg_v01,
 314                                        resp_type),
 315         },
 316         {
 317                 .data_type  = QMI_EOTI,
 318                 .elem_len   = 0,
 319                 .elem_size  = 0,
 320                 .array_type = NO_ARRAY,
 321                 .tlv_type   = 0x00,
 322                 .offset     = 0,
 323                 .ei_array   = NULL,
 324         },
 325 };
 326
 327 static struct qmi_elem_info slimbus_power_resp_msg_v01_ei[] = {
 328         {
 329                 .data_type  = QMI_STRUCT,
 330                 .elem_len   = 1,
 331                 .elem_size  = sizeof(struct qmi_response_type_v01),
 332                 .array_type = NO_ARRAY,
 333                 .tlv_type   = 0x02,
 334                 .offset     = offsetof(struct slimbus_power_resp_msg_v01, resp),
 335                 .ei_array   = qmi_response_type_v01_ei,
 336         },
 337         {
 338                 .data_type  = QMI_EOTI,
 339                 .elem_len   = 0,
 340                 .elem_size  = 0,
 341                 .array_type = NO_ARRAY,
 342                 .tlv_type   = 0x00,
 343                 .offset     = 0,
 344                 .ei_array   = NULL,
 345         },
 346 };
 347
 348 static int qcom_slim_qmi_send_select_inst_req(struct qcom_slim_ngd_ctrl *ctrl,
 349                                 struct slimbus_select_inst_req_msg_v01 *req)
 350 {
 351         struct slimbus_select_inst_resp_msg_v01 resp = { { 0, 0 } };
 352         struct qmi_txn txn;
 353         int rc;
 354
 355         rc = qmi_txn_init(ctrl->qmi.handle, &txn,
 356                                 slimbus_select_inst_resp_msg_v01_ei, &resp);
 357         if (rc < 0) {
 358                 dev_err(ctrl->dev, "QMI TXN init fail: %d\n", rc);
 359                 return rc;
 360         }
 361
 362         rc = qmi_send_request(ctrl->qmi.handle, NULL, &txn,
 363                                 SLIMBUS_QMI_SELECT_INSTANCE_REQ_V01,
 364                                 SLIMBUS_QMI_SELECT_INSTANCE_REQ_MAX_MSG_LEN,
 365                                 slimbus_select_inst_req_msg_v01_ei, req);
 366         if (rc < 0) {
 367                 dev_err(ctrl->dev, "QMI send req fail %d\n", rc);
 368                 qmi_txn_cancel(&txn);
 369                 return rc;
 370         }
 371
 372         rc = qmi_txn_wait(&txn, SLIMBUS_QMI_RESP_TOUT);
 373         if (rc < 0) {
 374                 dev_err(ctrl->dev, "QMI TXN wait fail: %d\n", rc);
 375                 return rc;
 376         }
 377         /* Check the response */
 378         if (resp.resp.result != QMI_RESULT_SUCCESS_V01) {
 379                 dev_err(ctrl->dev, "QMI request failed 0x%x\n",
 380                         resp.resp.result);
 381                 return -EREMOTEIO;
 382         }
 383
 384         return 0;
 385 }
 386
 387 static void qcom_slim_qmi_power_resp_cb(struct qmi_handle *handle,
 388                                         struct sockaddr_qrtr *sq,
 389                                         struct qmi_txn *txn, const void *data)
 390 {
 391         struct slimbus_power_resp_msg_v01 *resp;
 392
 393         resp = (struct slimbus_power_resp_msg_v01 *)data;
 394         if (resp->resp.result != QMI_RESULT_SUCCESS_V01)
 395                 pr_err("QMI power request failed 0x%x\n",
 396                                 resp->resp.result);
 397
 398         complete(&txn->completion);
 399 }
 400
 401 static int qcom_slim_qmi_send_power_request(struct qcom_slim_ngd_ctrl *ctrl,
 402                                         struct slimbus_power_req_msg_v01 *req)
 403 {
 404         struct slimbus_power_resp_msg_v01 resp = { { 0, 0 } };
 405         struct qmi_txn txn;
 406         int rc;
 407
 408         rc = qmi_txn_init(ctrl->qmi.handle, &txn,
 409                                 slimbus_power_resp_msg_v01_ei, &resp);
 410
 411         rc = qmi_send_request(ctrl->qmi.handle, NULL, &txn,
 412                                 SLIMBUS_QMI_POWER_REQ_V01,
 413                                 SLIMBUS_QMI_POWER_REQ_MAX_MSG_LEN,
 414                                 slimbus_power_req_msg_v01_ei, req);
 415         if (rc < 0) {
 416                 dev_err(ctrl->dev, "QMI send req fail %d\n", rc);
 417                 qmi_txn_cancel(&txn);
 418                 return rc;
 419         }
 420
 421         rc = qmi_txn_wait(&txn, SLIMBUS_QMI_RESP_TOUT);
 422         if (rc < 0) {
 423                 dev_err(ctrl->dev, "QMI TXN wait fail: %d\n", rc);
 424                 return rc;
 425         }
 426
 427         /* Check the response */
 428         if (resp.resp.result != QMI_RESULT_SUCCESS_V01) {
 429                 dev_err(ctrl->dev, "QMI request failed 0x%x\n",
 430                         resp.resp.result);
 431                 return -EREMOTEIO;
 432         }
 433
 434         return 0;
 435 }
 436
 437 static const struct qmi_msg_handler qcom_slim_qmi_msg_handlers[] = {
 438         {
 439                 .type = QMI_RESPONSE,
 440                 .msg_id = SLIMBUS_QMI_POWER_RESP_V01,
 441                 .ei = slimbus_power_resp_msg_v01_ei,
 442                 .decoded_size = sizeof(struct slimbus_power_resp_msg_v01),
 443                 .fn = qcom_slim_qmi_power_resp_cb,
 444         },
 445         {}
 446 };
 447
 448 static int qcom_slim_qmi_init(struct qcom_slim_ngd_ctrl *ctrl,
 449                               bool apps_is_master)
 450 {
 451         struct slimbus_select_inst_req_msg_v01 req;
 452         struct qmi_handle *handle;
 453         int rc;
 454
 455         handle = devm_kzalloc(ctrl->dev, sizeof(*handle), GFP_KERNEL);
 456         if (!handle)
 457                 return -ENOMEM;
 458
 459         rc = qmi_handle_init(handle, SLIMBUS_QMI_POWER_REQ_MAX_MSG_LEN,
 460                                 NULL, qcom_slim_qmi_msg_handlers);
 461         if (rc < 0) {
 462                 dev_err(ctrl->dev, "QMI client init failed: %d\n", rc);
 463                 goto qmi_handle_init_failed;
 464         }
 465
 466         rc = kernel_connect(handle->sock,
 467                                 (struct sockaddr *)&ctrl->qmi.svc_info,
 468                                 sizeof(ctrl->qmi.svc_info), 0);
 469         if (rc < 0) {
 470                 dev_err(ctrl->dev, "Remote Service connect failed: %d\n", rc);
 471                 goto qmi_connect_to_service_failed;
 472         }
 473
 474         /* Instance is 0 based */
 475         req.instance = (ctrl->ngd->id >> 1);
 476         req.mode_valid = 1;
 477
 478         /* Mode indicates the role of the ADSP */
 479         if (apps_is_master)
 480                 req.mode = SLIMBUS_MODE_SATELLITE_V01;
 481         else
 482                 req.mode = SLIMBUS_MODE_MASTER_V01;
 483
 484         ctrl->qmi.handle = handle;
 485
 486         rc = qcom_slim_qmi_send_select_inst_req(ctrl, &req);
 487         if (rc) {
 488                 dev_err(ctrl->dev, "failed to select h/w instance\n");
 489                 goto qmi_select_instance_failed;
 490         }
 491
 492         return 0;
 493
 494 qmi_select_instance_failed:
 495         ctrl->qmi.handle = NULL;
 496 qmi_connect_to_service_failed:
 497         qmi_handle_release(handle);
 498 qmi_handle_init_failed:
 499         devm_kfree(ctrl->dev, handle);
 500         return rc;
 501 }
 502
 503 static void qcom_slim_qmi_exit(struct qcom_slim_ngd_ctrl *ctrl)
 504 {
 505         if (!ctrl->qmi.handle)
 506                 return;
 507
 508         qmi_handle_release(ctrl->qmi.handle);
 509         devm_kfree(ctrl->dev, ctrl->qmi.handle);
 510         ctrl->qmi.handle = NULL;
 511 }
 512
 513 static int qcom_slim_qmi_power_request(struct qcom_slim_ngd_ctrl *ctrl,
 514                                        bool active)
 515 {
 516         struct slimbus_power_req_msg_v01 req;
 517
 518         if (active)
 519                 req.pm_req = SLIMBUS_PM_ACTIVE_V01;
 520         else
 521                 req.pm_req = SLIMBUS_PM_INACTIVE_V01;
 522
 523         req.resp_type_valid = 0;
 524
 525         return qcom_slim_qmi_send_power_request(ctrl, &req);
 526 }
 527
 528 static u32 *qcom_slim_ngd_tx_msg_get(struct qcom_slim_ngd_ctrl *ctrl, int len,
 529                                      struct completion *comp)
 530 {
 531         struct qcom_slim_ngd_dma_desc *desc;
 532         unsigned long flags;
 533
 534         spin_lock_irqsave(&ctrl->tx_buf_lock, flags);
 535
 536         if ((ctrl->tx_tail + 1) % QCOM_SLIM_NGD_DESC_NUM == ctrl->tx_head) {
 537                 spin_unlock_irqrestore(&ctrl->tx_buf_lock, flags);
 538                 return NULL;
 539         }
 540         desc  = &ctrl->txdesc[ctrl->tx_tail];
 541         desc->base = ctrl->tx_base + ctrl->tx_tail * SLIM_MSGQ_BUF_LEN;
 542         desc->comp = comp;
 543         ctrl->tx_tail = (ctrl->tx_tail + 1) % QCOM_SLIM_NGD_DESC_NUM;
 544
 545         spin_unlock_irqrestore(&ctrl->tx_buf_lock, flags);
 546
 547         return desc->base;
 548 }
 549
 550 static void qcom_slim_ngd_tx_msg_dma_cb(void *args)
 551 {
 552         struct qcom_slim_ngd_dma_desc *desc = args;
 553         struct qcom_slim_ngd_ctrl *ctrl = desc->ctrl;
 554         unsigned long flags;
 555
 556         spin_lock_irqsave(&ctrl->tx_buf_lock, flags);
 557
 558         if (desc->comp) {
 559                 complete(desc->comp);
 560                 desc->comp = NULL;
 561         }
 562
 563         ctrl->tx_head = (ctrl->tx_head + 1) % QCOM_SLIM_NGD_DESC_NUM;
 564         spin_unlock_irqrestore(&ctrl->tx_buf_lock, flags);
 565 }
 566
 567 static int qcom_slim_ngd_tx_msg_post(struct qcom_slim_ngd_ctrl *ctrl,
 568                                      void *buf, int len)
 569 {
 570         struct qcom_slim_ngd_dma_desc *desc;
 571         unsigned long flags;
 572         int index, offset;
 573
 574         spin_lock_irqsave(&ctrl->tx_buf_lock, flags);
 575         offset = buf - ctrl->tx_base;
 576         index = offset/SLIM_MSGQ_BUF_LEN;
 577
 578         desc = &ctrl->txdesc[index];
 579         desc->phys = ctrl->tx_phys_base + offset;
 580         desc->base = ctrl->tx_base + offset;
 581         desc->ctrl = ctrl;
 582         len = (len + 3) & 0xfc;
 583
 584         desc->desc = dmaengine_prep_slave_single(ctrl->dma_tx_channel,
 585                                                 desc->phys, len,
 586                                                 DMA_MEM_TO_DEV,
 587                                                 DMA_PREP_INTERRUPT);
 588         if (!desc->desc) {
 589                 dev_err(ctrl->dev, "unable to prepare channel\n");
 590                 spin_unlock_irqrestore(&ctrl->tx_buf_lock, flags);
 591                 return -EINVAL;
 592         }
 593
 594         desc->desc->callback = qcom_slim_ngd_tx_msg_dma_cb;
 595         desc->desc->callback_param = desc;
 596         desc->desc->cookie = dmaengine_submit(desc->desc);
 597         dma_async_issue_pending(ctrl->dma_tx_channel);
 598         spin_unlock_irqrestore(&ctrl->tx_buf_lock, flags);
 599
 600         return 0;
 601 }
 602
 603 static void qcom_slim_ngd_rx(struct qcom_slim_ngd_ctrl *ctrl, u8 *buf)
 604 {
 605         u8 mc, mt, len;
 606
 607         mt = SLIM_HEADER_GET_MT(buf[0]);
 608         len = SLIM_HEADER_GET_RL(buf[0]);
 609         mc = SLIM_HEADER_GET_MC(buf[1]);
 610
 611         if (mc == SLIM_USR_MC_MASTER_CAPABILITY &&
 612                 mt == SLIM_MSG_MT_SRC_REFERRED_USER)
 613                 queue_work(ctrl->mwq, &ctrl->m_work);
 614
 615         if (mc == SLIM_MSG_MC_REPLY_INFORMATION ||
 616             mc == SLIM_MSG_MC_REPLY_VALUE || (mc == SLIM_USR_MC_ADDR_REPLY &&
 617             mt == SLIM_MSG_MT_SRC_REFERRED_USER) ||
 618                 (mc == SLIM_USR_MC_GENERIC_ACK &&
 619                  mt == SLIM_MSG_MT_SRC_REFERRED_USER)) {
 620                 slim_msg_response(&ctrl->ctrl, &buf[4], buf[3], len - 4);
 621                 pm_runtime_mark_last_busy(ctrl->dev);
 622         }
 623 }
 624
 625 static void qcom_slim_ngd_rx_msgq_cb(void *args)
 626 {
 627         struct qcom_slim_ngd_dma_desc *desc = args;
 628         struct qcom_slim_ngd_ctrl *ctrl = desc->ctrl;
 629
 630         qcom_slim_ngd_rx(ctrl, (u8 *)desc->base);
 631         /* Add descriptor back to the queue */
 632         desc->desc = dmaengine_prep_slave_single(ctrl->dma_rx_channel,
 633                                         desc->phys, SLIM_MSGQ_BUF_LEN,
 634                                         DMA_DEV_TO_MEM,
 635                                         DMA_PREP_INTERRUPT);
 636         if (!desc->desc) {
 637                 dev_err(ctrl->dev, "Unable to prepare rx channel\n");
 638                 return;
 639         }
 640
 641         desc->desc->callback = qcom_slim_ngd_rx_msgq_cb;
 642         desc->desc->callback_param = desc;
 643         desc->desc->cookie = dmaengine_submit(desc->desc);
 644         dma_async_issue_pending(ctrl->dma_rx_channel);
 645 }
 646
 647 static int qcom_slim_ngd_post_rx_msgq(struct qcom_slim_ngd_ctrl *ctrl)
 648 {
 649         struct qcom_slim_ngd_dma_desc *desc;
 650         int i;
 651
 652         for (i = 0; i < QCOM_SLIM_NGD_DESC_NUM; i++) {
 653                 desc = &ctrl->rx_desc[i];
 654                 desc->phys = ctrl->rx_phys_base + i * SLIM_MSGQ_BUF_LEN;
 655                 desc->ctrl = ctrl;
 656                 desc->base = ctrl->rx_base + i * SLIM_MSGQ_BUF_LEN;
 657                 desc->desc = dmaengine_prep_slave_single(ctrl->dma_rx_channel,
 658                                                 desc->phys, SLIM_MSGQ_BUF_LEN,
 659                                                 DMA_DEV_TO_MEM,
 660                                                 DMA_PREP_INTERRUPT);
 661                 if (!desc->desc) {
 662                         dev_err(ctrl->dev, "Unable to prepare rx channel\n");
 663                         return -EINVAL;
 664                 }
 665
 666                 desc->desc->callback = qcom_slim_ngd_rx_msgq_cb;
 667                 desc->desc->callback_param = desc;
 668                 desc->desc->cookie = dmaengine_submit(desc->desc);
 669         }
 670         dma_async_issue_pending(ctrl->dma_rx_channel);
 671
 672         return 0;
 673 }
 674
 675 static int qcom_slim_ngd_init_rx_msgq(struct qcom_slim_ngd_ctrl *ctrl)
 676 {
 677         struct device *dev = ctrl->dev;
 678         int ret, size;
 679
 680         ctrl->dma_rx_channel = dma_request_chan(dev, "rx");
 681         if (IS_ERR(ctrl->dma_rx_channel)) {
 682                 dev_err(dev, "Failed to request RX dma channel");
 683                 ret = PTR_ERR(ctrl->dma_rx_channel);
 684                 ctrl->dma_rx_channel = NULL;
 685                 return ret;
 686         }
 687
 688         size = QCOM_SLIM_NGD_DESC_NUM * SLIM_MSGQ_BUF_LEN;
 689         ctrl->rx_base = dma_alloc_coherent(dev, size, &ctrl->rx_phys_base,
 690                                            GFP_KERNEL);
 691         if (!ctrl->rx_base) {
 692                 ret = -ENOMEM;
 693                 goto rel_rx;
 694         }
 695
 696         ret = qcom_slim_ngd_post_rx_msgq(ctrl);
 697         if (ret) {
 698                 dev_err(dev, "post_rx_msgq() failed 0x%x\n", ret);
 699                 goto rx_post_err;
 700         }
 701
 702         return 0;
 703
 704 rx_post_err:
 705         dma_free_coherent(dev, size, ctrl->rx_base, ctrl->rx_phys_base);
 706 rel_rx:
 707         dma_release_channel(ctrl->dma_rx_channel);
 708         return ret;
 709 }
 710
 711 static int qcom_slim_ngd_init_tx_msgq(struct qcom_slim_ngd_ctrl *ctrl)
 712 {
 713         struct device *dev = ctrl->dev;
 714         unsigned long flags;
 715         int ret = 0;
 716         int size;
 717
 718         ctrl->dma_tx_channel = dma_request_chan(dev, "tx");
 719         if (IS_ERR(ctrl->dma_tx_channel)) {
 720                 dev_err(dev, "Failed to request TX dma channel");
 721                 ret = PTR_ERR(ctrl->dma_tx_channel);
 722                 ctrl->dma_tx_channel = NULL;
 723                 return ret;
 724         }
 725
 726         size = ((QCOM_SLIM_NGD_DESC_NUM + 1) * SLIM_MSGQ_BUF_LEN);
 727         ctrl->tx_base = dma_alloc_coherent(dev, size, &ctrl->tx_phys_base,
 728                                            GFP_KERNEL);
 729         if (!ctrl->tx_base) {
 730                 ret = -EINVAL;
 731                 goto rel_tx;
 732         }
 733
 734         spin_lock_irqsave(&ctrl->tx_buf_lock, flags);
 735         ctrl->tx_tail = 0;
 736         ctrl->tx_head = 0;
 737         spin_unlock_irqrestore(&ctrl->tx_buf_lock, flags);
 738
 739         return 0;
 740 rel_tx:
 741         dma_release_channel(ctrl->dma_tx_channel);
 742         return ret;
 743 }
 744
 745 static int qcom_slim_ngd_init_dma(struct qcom_slim_ngd_ctrl *ctrl)
 746 {
 747         int ret = 0;
 748
 749         ret = qcom_slim_ngd_init_rx_msgq(ctrl);
 750         if (ret) {
 751                 dev_err(ctrl->dev, "rx dma init failed\n");
 752                 return ret;
 753         }
 754
 755         ret = qcom_slim_ngd_init_tx_msgq(ctrl);
 756         if (ret)
 757                 dev_err(ctrl->dev, "tx dma init failed\n");
 758
 759         return ret;
 760 }
 761
 762 static irqreturn_t qcom_slim_ngd_interrupt(int irq, void *d)
 763 {
 764         struct qcom_slim_ngd_ctrl *ctrl = d;
 765         void __iomem *base = ctrl->ngd->base;
 766         u32 stat = readl(base + NGD_INT_STAT);
 767
 768         if ((stat & NGD_INT_MSG_BUF_CONTE) ||
 769                 (stat & NGD_INT_MSG_TX_INVAL) || (stat & NGD_INT_DEV_ERR) ||
 770                 (stat & NGD_INT_TX_NACKED_2)) {
 771                 dev_err(ctrl->dev, "Error Interrupt received 0x%x\n", stat);
 772         }
 773
 774         writel(stat, base + NGD_INT_CLR);
 775
 776         return IRQ_HANDLED;
 777 }
 778
 779 static int qcom_slim_ngd_xfer_msg(struct slim_controller *sctrl,
 780                                   struct slim_msg_txn *txn)
 781 {
 782         struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(sctrl->dev);
 783         DECLARE_COMPLETION_ONSTACK(tx_sent);
 784         DECLARE_COMPLETION_ONSTACK(done);
 785         int ret, timeout, i;
 786         u8 wbuf[SLIM_MSGQ_BUF_LEN];
 787         u8 rbuf[SLIM_MSGQ_BUF_LEN];
 788         u32 *pbuf;
 789         u8 *puc;
 790         u8 la = txn->la;
 791         bool usr_msg = false;
 792
 793         if (txn->mt == SLIM_MSG_MT_CORE &&
 794                 (txn->mc >= SLIM_MSG_MC_BEGIN_RECONFIGURATION &&
 795                  txn->mc <= SLIM_MSG_MC_RECONFIGURE_NOW))
 796                 return 0;
 797
 798         if (txn->dt == SLIM_MSG_DEST_ENUMADDR)
 799                 return -EPROTONOSUPPORT;
 800
 801         if (txn->msg->num_bytes > SLIM_MSGQ_BUF_LEN ||
 802                         txn->rl > SLIM_MSGQ_BUF_LEN) {
 803                 dev_err(ctrl->dev, "msg exceeds HW limit\n");
 804                 return -EINVAL;
 805         }
 806
 807         pbuf = qcom_slim_ngd_tx_msg_get(ctrl, txn->rl, &tx_sent);
 808         if (!pbuf) {
 809                 dev_err(ctrl->dev, "Message buffer unavailable\n");
 810                 return -ENOMEM;
 811         }
 812
 813         if (txn->mt == SLIM_MSG_MT_CORE &&
 814                 (txn->mc == SLIM_MSG_MC_CONNECT_SOURCE ||
 815                 txn->mc == SLIM_MSG_MC_CONNECT_SINK ||
 816                 txn->mc == SLIM_MSG_MC_DISCONNECT_PORT)) {
 817                 txn->mt = SLIM_MSG_MT_DEST_REFERRED_USER;
 818                 switch (txn->mc) {
 819                 case SLIM_MSG_MC_CONNECT_SOURCE:
 820                         txn->mc = SLIM_USR_MC_CONNECT_SRC;
 821                         break;
 822                 case SLIM_MSG_MC_CONNECT_SINK:
 823                         txn->mc = SLIM_USR_MC_CONNECT_SINK;
 824                         break;
 825                 case SLIM_MSG_MC_DISCONNECT_PORT:
 826                         txn->mc = SLIM_USR_MC_DISCONNECT_PORT;
 827                         break;
 828                 default:
 829                         return -EINVAL;
 830                 }
 831
 832                 usr_msg = true;
 833                 i = 0;
 834                 wbuf[i++] = txn->la;
 835                 la = SLIM_LA_MGR;
 836                 wbuf[i++] = txn->msg->wbuf[0];
 837                 if (txn->mc != SLIM_USR_MC_DISCONNECT_PORT)
 838                         wbuf[i++] = txn->msg->wbuf[1];
 839
 840                 txn->comp = &done;
 841                 ret = slim_alloc_txn_tid(sctrl, txn);
 842                 if (ret) {
 843                         dev_err(ctrl->dev, "Unable to allocate TID\n");
 844                         return ret;
 845                 }
 846
 847                 wbuf[i++] = txn->tid;
 848
 849                 txn->msg->num_bytes = i;
 850                 txn->msg->wbuf = wbuf;
 851                 txn->msg->rbuf = rbuf;
 852                 txn->rl = txn->msg->num_bytes + 4;
 853         }
 854
 855         /* HW expects length field to be excluded */
 856         txn->rl--;
 857         puc = (u8 *)pbuf;
 858         *pbuf = 0;
 859         if (txn->dt == SLIM_MSG_DEST_LOGICALADDR) {
 860                 *pbuf = SLIM_MSG_ASM_FIRST_WORD(txn->rl, txn->mt, txn->mc, 0,
 861                                 la);
 862                 puc += 3;
 863         } else {
 864                 *pbuf = SLIM_MSG_ASM_FIRST_WORD(txn->rl, txn->mt, txn->mc, 1,
 865                                 la);
 866                 puc += 2;
 867         }
 868
 869         if (slim_tid_txn(txn->mt, txn->mc))
 870                 *(puc++) = txn->tid;
 871
 872         if (slim_ec_txn(txn->mt, txn->mc)) {
 873                 *(puc++) = (txn->ec & 0xFF);
 874                 *(puc++) = (txn->ec >> 8) & 0xFF;
 875         }
 876
 877         if (txn->msg && txn->msg->wbuf)
 878                 memcpy(puc, txn->msg->wbuf, txn->msg->num_bytes);
 879
 880         mutex_lock(&ctrl->tx_lock);
 881         ret = qcom_slim_ngd_tx_msg_post(ctrl, pbuf, txn->rl);
 882         if (ret) {
 883                 mutex_unlock(&ctrl->tx_lock);
 884                 return ret;
 885         }
 886
 887         timeout = wait_for_completion_timeout(&tx_sent, HZ);
 888         if (!timeout) {
 889                 dev_err(sctrl->dev, "TX timed out:MC:0x%x,mt:0x%x", txn->mc,
 890                                         txn->mt);
 891                 mutex_unlock(&ctrl->tx_lock);
 892                 return -ETIMEDOUT;
 893         }
 894
 895         if (usr_msg) {
 896                 timeout = wait_for_completion_timeout(&done, HZ);
 897                 if (!timeout) {
 898                         dev_err(sctrl->dev, "TX timed out:MC:0x%x,mt:0x%x",
 899                                 txn->mc, txn->mt);
 900                         mutex_unlock(&ctrl->tx_lock);
 901                         return -ETIMEDOUT;
 902                 }
 903         }
 904
 905         mutex_unlock(&ctrl->tx_lock);
 906         return 0;
 907 }
 908
 909 static int qcom_slim_ngd_xfer_msg_sync(struct slim_controller *ctrl,
 910                                        struct slim_msg_txn *txn)
 911 {
 912         DECLARE_COMPLETION_ONSTACK(done);
 913         int ret, timeout;
 914
 915         pm_runtime_get_sync(ctrl->dev);
 916
 917         txn->comp = &done;
 918
 919         ret = qcom_slim_ngd_xfer_msg(ctrl, txn);
 920         if (ret)
 921                 return ret;
 922
 923         timeout = wait_for_completion_timeout(&done, HZ);
 924         if (!timeout) {
 925                 dev_err(ctrl->dev, "TX timed out:MC:0x%x,mt:0x%x", txn->mc,
 926                                 txn->mt);
 927                 return -ETIMEDOUT;
 928         }
 929         return 0;
 930 }
 931
 932 static int qcom_slim_ngd_enable_stream(struct slim_stream_runtime *rt)
 933 {
 934         struct slim_device *sdev = rt->dev;
 935         struct slim_controller *ctrl = sdev->ctrl;
 936         struct slim_val_inf msg =  {0};
 937         u8 wbuf[SLIM_MSGQ_BUF_LEN];
 938         u8 rbuf[SLIM_MSGQ_BUF_LEN];
 939         struct slim_msg_txn txn = {0,};
 940         int i, ret;
 941
 942         txn.mt = SLIM_MSG_MT_DEST_REFERRED_USER;
 943         txn.dt = SLIM_MSG_DEST_LOGICALADDR;
 944         txn.la = SLIM_LA_MGR;
 945         txn.ec = 0;
 946         txn.msg = &msg;
 947         txn.msg->num_bytes = 0;
 948         txn.msg->wbuf = wbuf;
 949         txn.msg->rbuf = rbuf;
 950
 951         for (i = 0; i < rt->num_ports; i++) {
 952                 struct slim_port *port = &rt->ports[i];
 953
 954                 if (txn.msg->num_bytes == 0) {
 955                         int seg_interval = SLIM_SLOTS_PER_SUPERFRAME/rt->ratem;
 956                         int exp;
 957
 958                         wbuf[txn.msg->num_bytes++] = sdev->laddr;
 959                         wbuf[txn.msg->num_bytes] = rt->bps >> 2 |
 960                                                    (port->ch.aux_fmt << 6);
 961
 962                         /* Data channel segment interval not multiple of 3 */
 963                         exp = seg_interval % 3;
 964                         if (exp)
 965                                 wbuf[txn.msg->num_bytes] |= BIT(5);
 966
 967                         txn.msg->num_bytes++;
 968                         wbuf[txn.msg->num_bytes++] = exp << 4 | rt->prot;
 969
 970                         if (rt->prot == SLIM_PROTO_ISO)
 971                                 wbuf[txn.msg->num_bytes++] =
 972                                                 port->ch.prrate |
 973                                                 SLIM_CHANNEL_CONTENT_FL;
 974                         else
 975                                 wbuf[txn.msg->num_bytes++] =  port->ch.prrate;
 976
 977                         ret = slim_alloc_txn_tid(ctrl, &txn);
 978                         if (ret) {
 979                                 dev_err(&sdev->dev, "Fail to allocate TID\n");
 980                                 return -ENXIO;
 981                         }
 982                         wbuf[txn.msg->num_bytes++] = txn.tid;
 983                 }
 984                 wbuf[txn.msg->num_bytes++] = port->ch.id;
 985         }
 986
 987         txn.mc = SLIM_USR_MC_DEF_ACT_CHAN;
 988         txn.rl = txn.msg->num_bytes + 4;
 989         ret = qcom_slim_ngd_xfer_msg_sync(ctrl, &txn);
 990         if (ret) {
 991                 slim_free_txn_tid(ctrl, &txn);
 992                 dev_err(&sdev->dev, "TX timed out:MC:0x%x,mt:0x%x", txn.mc,
 993                                 txn.mt);
 994                 return ret;
 995         }
 996
 997         txn.mc = SLIM_USR_MC_RECONFIG_NOW;
 998         txn.msg->num_bytes = 2;
 999         wbuf[1] = sdev->laddr;
1000         txn.rl = txn.msg->num_bytes + 4;
1001
1002         ret = slim_alloc_txn_tid(ctrl, &txn);
1003         if (ret) {
1004                 dev_err(ctrl->dev, "Fail to allocate TID\n");
1005                 return ret;
1006         }
1007
1008         wbuf[0] = txn.tid;
1009         ret = qcom_slim_ngd_xfer_msg_sync(ctrl, &txn);
1010         if (ret) {
1011                 slim_free_txn_tid(ctrl, &txn);
1012                 dev_err(&sdev->dev, "TX timed out:MC:0x%x,mt:0x%x", txn.mc,
1013                                 txn.mt);
1014         }
1015
1016         return ret;
1017 }
1018
1019 static int qcom_slim_ngd_get_laddr(struct slim_controller *ctrl,
1020                                    struct slim_eaddr *ea, u8 *laddr)
1021 {
1022         struct slim_val_inf msg =  {0};
1023         u8 failed_ea[6] = {0, 0, 0, 0, 0, 0};
1024         struct slim_msg_txn txn;
1025         u8 wbuf[10] = {0};
1026         u8 rbuf[10] = {0};
1027         int ret;
1028
1029         txn.mt = SLIM_MSG_MT_DEST_REFERRED_USER;
1030         txn.dt = SLIM_MSG_DEST_LOGICALADDR;
1031         txn.la = SLIM_LA_MGR;
1032         txn.ec = 0;
1033
1034         txn.mc = SLIM_USR_MC_ADDR_QUERY;
1035         txn.rl = 11;
1036         txn.msg = &msg;
1037         txn.msg->num_bytes = 7;
1038         txn.msg->wbuf = wbuf;
1039         txn.msg->rbuf = rbuf;
1040
1041         ret = slim_alloc_txn_tid(ctrl, &txn);
1042         if (ret < 0)
1043                 return ret;
1044
1045         wbuf[0] = (u8)txn.tid;
1046         memcpy(&wbuf[1], ea, sizeof(*ea));
1047
1048         ret = qcom_slim_ngd_xfer_msg_sync(ctrl, &txn);
1049         if (ret) {
1050                 slim_free_txn_tid(ctrl, &txn);
1051                 return ret;
1052         }
1053
1054         if (!memcmp(rbuf, failed_ea, 6))
1055                 return -ENXIO;
1056
1057         *laddr = rbuf[6];
1058
1059         return ret;
1060 }
1061
1062 static int qcom_slim_ngd_exit_dma(struct qcom_slim_ngd_ctrl *ctrl)
1063 {
1064         if (ctrl->dma_rx_channel) {
1065                 dmaengine_terminate_sync(ctrl->dma_rx_channel);
1066                 dma_release_channel(ctrl->dma_rx_channel);
1067         }
1068
1069         if (ctrl->dma_tx_channel) {
1070                 dmaengine_terminate_sync(ctrl->dma_tx_channel);
1071                 dma_release_channel(ctrl->dma_tx_channel);
1072         }
1073
1074         ctrl->dma_tx_channel = ctrl->dma_rx_channel = NULL;
1075
1076         return 0;
1077 }
1078
1079 static void qcom_slim_ngd_setup(struct qcom_slim_ngd_ctrl *ctrl)
1080 {
1081         u32 cfg = readl_relaxed(ctrl->ngd->base);
1082
1083         if (ctrl->state == QCOM_SLIM_NGD_CTRL_DOWN)
1084                 qcom_slim_ngd_init_dma(ctrl);
1085
1086         /* By default enable message queues */
1087         cfg |= NGD_CFG_RX_MSGQ_EN;
1088         cfg |= NGD_CFG_TX_MSGQ_EN;
1089
1090         /* Enable NGD if it's not already enabled*/
1091         if (!(cfg & NGD_CFG_ENABLE))
1092                 cfg |= NGD_CFG_ENABLE;
1093
1094         writel_relaxed(cfg, ctrl->ngd->base);
1095 }
1096
1097 static int qcom_slim_ngd_power_up(struct qcom_slim_ngd_ctrl *ctrl)
1098 {
1099         enum qcom_slim_ngd_state cur_state = ctrl->state;
1100         struct qcom_slim_ngd *ngd = ctrl->ngd;
1101         u32 laddr, rx_msgq;
1102         int timeout, ret = 0;
1103
1104         if (ctrl->state == QCOM_SLIM_NGD_CTRL_DOWN) {
1105                 timeout = wait_for_completion_timeout(&ctrl->qmi.qmi_comp, HZ);
1106                 if (!timeout)
1107                         return -EREMOTEIO;
1108         }
1109
1110         if (ctrl->state == QCOM_SLIM_NGD_CTRL_ASLEEP ||
1111                 ctrl->state == QCOM_SLIM_NGD_CTRL_DOWN) {
1112                 ret = qcom_slim_qmi_power_request(ctrl, true);
1113                 if (ret) {
1114                         dev_err(ctrl->dev, "SLIM QMI power request failed:%d\n",
1115                                         ret);
1116                         return ret;
1117                 }
1118         }
1119
1120         ctrl->ver = readl_relaxed(ctrl->base);
1121         /* Version info in 16 MSbits */
1122         ctrl->ver >>= 16;
1123
1124         laddr = readl_relaxed(ngd->base + NGD_STATUS);
1125         if (laddr & NGD_LADDR) {
1126                 /*
1127                  * external MDM restart case where ADSP itself was active framer
1128                  * For example, modem restarted when playback was active
1129                  */
1130                 if (cur_state == QCOM_SLIM_NGD_CTRL_AWAKE) {
1131                         dev_info(ctrl->dev, "Subsys restart: ADSP active framer\n");
1132                         return 0;
1133                 }
1134                 return 0;
1135         }
1136
1137         writel_relaxed(DEF_NGD_INT_MASK, ngd->base + NGD_INT_EN);
1138         rx_msgq = readl_relaxed(ngd->base + NGD_RX_MSGQ_CFG);
1139
1140         writel_relaxed(rx_msgq|SLIM_RX_MSGQ_TIMEOUT_VAL,
1141                                 ngd->base + NGD_RX_MSGQ_CFG);
1142         qcom_slim_ngd_setup(ctrl);
1143
1144         timeout = wait_for_completion_timeout(&ctrl->reconf, HZ);
1145         if (!timeout) {
1146                 dev_err(ctrl->dev, "capability exchange timed-out\n");
1147                 return -ETIMEDOUT;
1148         }
1149
1150         return 0;
1151 }
1152
1153 static void qcom_slim_ngd_notify_slaves(struct qcom_slim_ngd_ctrl *ctrl)
1154 {
1155         struct slim_device *sbdev;
1156         struct device_node *node;
1157
1158         for_each_child_of_node(ctrl->ngd->pdev->dev.of_node, node) {
1159                 sbdev = of_slim_get_device(&ctrl->ctrl, node);
1160                 if (!sbdev)
1161                         continue;
1162
1163                 if (slim_get_logical_addr(sbdev))
1164                         dev_err(ctrl->dev, "Failed to get logical address\n");
1165         }
1166 }
1167
1168 static void qcom_slim_ngd_master_worker(struct work_struct *work)
1169 {
1170         struct qcom_slim_ngd_ctrl *ctrl;
1171         struct slim_msg_txn txn;
1172         struct slim_val_inf msg = {0};
1173         int retries = 0;
1174         u8 wbuf[8];
1175         int ret = 0;
1176
1177         ctrl = container_of(work, struct qcom_slim_ngd_ctrl, m_work);
1178         txn.dt = SLIM_MSG_DEST_LOGICALADDR;
1179         txn.ec = 0;
1180         txn.mc = SLIM_USR_MC_REPORT_SATELLITE;
1181         txn.mt = SLIM_MSG_MT_SRC_REFERRED_USER;
1182         txn.la = SLIM_LA_MGR;
1183         wbuf[0] = SAT_MAGIC_LSB;
1184         wbuf[1] = SAT_MAGIC_MSB;
1185         wbuf[2] = SAT_MSG_VER;
1186         wbuf[3] = SAT_MSG_PROT;
1187         txn.msg = &msg;
1188         txn.msg->wbuf = wbuf;
1189         txn.msg->num_bytes = 4;
1190         txn.rl = 8;
1191
1192         dev_info(ctrl->dev, "SLIM SAT: Rcvd master capability\n");
1193
1194 capability_retry:
1195         ret = qcom_slim_ngd_xfer_msg(&ctrl->ctrl, &txn);
1196         if (!ret) {
1197                 if (ctrl->state >= QCOM_SLIM_NGD_CTRL_ASLEEP)
1198                         complete(&ctrl->reconf);
1199                 else
1200                         dev_err(ctrl->dev, "unexpected state:%d\n",
1201                                                 ctrl->state);
1202
1203                 if (ctrl->state == QCOM_SLIM_NGD_CTRL_DOWN)
1204                         qcom_slim_ngd_notify_slaves(ctrl);
1205
1206         } else if (ret == -EIO) {
1207                 dev_err(ctrl->dev, "capability message NACKed, retrying\n");
1208                 if (retries < INIT_MX_RETRIES) {
1209                         msleep(DEF_RETRY_MS);
1210                         retries++;
1211                         goto capability_retry;
1212                 }
1213         } else {
1214                 dev_err(ctrl->dev, "SLIM: capability TX failed:%d\n", ret);
1215         }
1216 }
1217
1218 static int qcom_slim_ngd_update_device_status(struct device *dev, void *null)
1219 {
1220         slim_report_absent(to_slim_device(dev));
1221
1222         return 0;
1223 }
1224
1225 static int qcom_slim_ngd_runtime_resume(struct device *dev)
1226 {
1227         struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev);
1228         int ret = 0;
1229
1230         if (!ctrl->qmi.handle)
1231                 return 0;
1232
1233         if (ctrl->state >= QCOM_SLIM_NGD_CTRL_ASLEEP)
1234                 ret = qcom_slim_ngd_power_up(ctrl);
1235         if (ret) {
1236                 /* Did SSR cause this power up failure */
1237                 if (ctrl->state != QCOM_SLIM_NGD_CTRL_DOWN)
1238                         ctrl->state = QCOM_SLIM_NGD_CTRL_ASLEEP;
1239                 else
1240                         dev_err(ctrl->dev, "HW wakeup attempt during SSR\n");
1241         } else {
1242                 ctrl->state = QCOM_SLIM_NGD_CTRL_AWAKE;
1243         }
1244
1245         return 0;
1246 }
1247
1248 static int qcom_slim_ngd_enable(struct qcom_slim_ngd_ctrl *ctrl, bool enable)
1249 {
1250         if (enable) {
1251                 int ret = qcom_slim_qmi_init(ctrl, false);
1252
1253                 if (ret) {
1254                         dev_err(ctrl->dev, "qmi init fail, ret:%d, state:%d\n",
1255                                 ret, ctrl->state);
1256                         return ret;
1257                 }
1258                 /* controller state should be in sync with framework state */
1259                 complete(&ctrl->qmi.qmi_comp);
1260                 if (!pm_runtime_enabled(ctrl->dev) ||
1261                                 !pm_runtime_suspended(ctrl->dev))
1262                         qcom_slim_ngd_runtime_resume(ctrl->dev);
1263                 else
1264                         pm_runtime_resume(ctrl->dev);
1265                 pm_runtime_mark_last_busy(ctrl->dev);
1266                 pm_runtime_put(ctrl->dev);
1267
1268                 ret = slim_register_controller(&ctrl->ctrl);
1269                 if (ret) {
1270                         dev_err(ctrl->dev, "error adding slim controller\n");
1271                         return ret;
1272                 }
1273
1274                 dev_info(ctrl->dev, "SLIM controller Registered\n");
1275         } else {
1276                 qcom_slim_qmi_exit(ctrl);
1277                 slim_unregister_controller(&ctrl->ctrl);
1278         }
1279
1280         return 0;
1281 }
1282
1283 static int qcom_slim_ngd_qmi_new_server(struct qmi_handle *hdl,
1284                                         struct qmi_service *service)
1285 {
1286         struct qcom_slim_ngd_qmi *qmi =
1287                 container_of(hdl, struct qcom_slim_ngd_qmi, svc_event_hdl);
1288         struct qcom_slim_ngd_ctrl *ctrl =
1289                 container_of(qmi, struct qcom_slim_ngd_ctrl, qmi);
1290
1291         qmi->svc_info.sq_family = AF_QIPCRTR;
1292         qmi->svc_info.sq_node = service->node;
1293         qmi->svc_info.sq_port = service->port;
1294
1295         complete(&ctrl->qmi_up);
1296
1297         return 0;
1298 }
1299
1300 static void qcom_slim_ngd_qmi_del_server(struct qmi_handle *hdl,
1301                                          struct qmi_service *service)
1302 {
1303         struct qcom_slim_ngd_qmi *qmi =
1304                 container_of(hdl, struct qcom_slim_ngd_qmi, svc_event_hdl);
1305         struct qcom_slim_ngd_ctrl *ctrl =
1306                 container_of(qmi, struct qcom_slim_ngd_ctrl, qmi);
1307
1308         reinit_completion(&ctrl->qmi_up);
1309         qmi->svc_info.sq_node = 0;
1310         qmi->svc_info.sq_port = 0;
1311 }
1312
1313 static const struct qmi_ops qcom_slim_ngd_qmi_svc_event_ops = {
1314         .new_server = qcom_slim_ngd_qmi_new_server,
1315         .del_server = qcom_slim_ngd_qmi_del_server,
1316 };
1317
1318 static int qcom_slim_ngd_qmi_svc_event_init(struct qcom_slim_ngd_ctrl *ctrl)
1319 {
1320         struct qcom_slim_ngd_qmi *qmi = &ctrl->qmi;
1321         int ret;
1322
1323         ret = qmi_handle_init(&qmi->svc_event_hdl, 0,
1324                                 &qcom_slim_ngd_qmi_svc_event_ops, NULL);
1325         if (ret < 0) {
1326                 dev_err(ctrl->dev, "qmi_handle_init failed: %d\n", ret);
1327                 return ret;
1328         }
1329
1330         ret = qmi_add_lookup(&qmi->svc_event_hdl, SLIMBUS_QMI_SVC_ID,
1331                         SLIMBUS_QMI_SVC_V1, SLIMBUS_QMI_INS_ID);
1332         if (ret < 0) {
1333                 dev_err(ctrl->dev, "qmi_add_lookup failed: %d\n", ret);
1334                 qmi_handle_release(&qmi->svc_event_hdl);
1335         }
1336         return ret;
1337 }
1338
1339 static void qcom_slim_ngd_qmi_svc_event_deinit(struct qcom_slim_ngd_qmi *qmi)
1340 {
1341         qmi_handle_release(&qmi->svc_event_hdl);
1342 }
1343
1344 static struct platform_driver qcom_slim_ngd_driver;
1345 #define QCOM_SLIM_NGD_DRV_NAME  "qcom,slim-ngd"
1346
1347 static const struct of_device_id qcom_slim_ngd_dt_match[] = {
1348         {
1349                 .compatible = "qcom,slim-ngd-v1.5.0",
1350                 .data = &ngd_v1_5_offset_info,
1351         },{
1352                 .compatible = "qcom,slim-ngd-v2.1.0",
1353                 .data = &ngd_v1_5_offset_info,
1354         },
1355         {}
1356 };
1357
1358 MODULE_DEVICE_TABLE(of, qcom_slim_ngd_dt_match);
1359
1360 static void qcom_slim_ngd_down(struct qcom_slim_ngd_ctrl *ctrl)
1361 {
1362         mutex_lock(&ctrl->ssr_lock);
1363         device_for_each_child(ctrl->ctrl.dev, NULL,
1364                               qcom_slim_ngd_update_device_status);
1365         qcom_slim_ngd_enable(ctrl, false);
1366         mutex_unlock(&ctrl->ssr_lock);
1367 }
1368
1369 static void qcom_slim_ngd_up_worker(struct work_struct *work)
1370 {
1371         struct qcom_slim_ngd_ctrl *ctrl;
1372
1373         ctrl = container_of(work, struct qcom_slim_ngd_ctrl, ngd_up_work);
1374
1375         /* Make sure qmi service is up before continuing */
1376         wait_for_completion_interruptible(&ctrl->qmi_up);
1377
1378         mutex_lock(&ctrl->ssr_lock);
1379         qcom_slim_ngd_enable(ctrl, true);
1380         mutex_unlock(&ctrl->ssr_lock);
1381 }
1382
1383 static int qcom_slim_ngd_ssr_pdr_notify(struct qcom_slim_ngd_ctrl *ctrl,
1384                                         unsigned long action)
1385 {
1386         switch (action) {
1387         case QCOM_SSR_BEFORE_SHUTDOWN:
1388         case SERVREG_SERVICE_STATE_DOWN:
1389                 /* Make sure the last dma xfer is finished */
1390                 mutex_lock(&ctrl->tx_lock);
1391                 if (ctrl->state != QCOM_SLIM_NGD_CTRL_DOWN) {
1392                         pm_runtime_get_noresume(ctrl->dev);
1393                         ctrl->state = QCOM_SLIM_NGD_CTRL_DOWN;
1394                         qcom_slim_ngd_down(ctrl);
1395                         qcom_slim_ngd_exit_dma(ctrl);
1396                 }
1397                 mutex_unlock(&ctrl->tx_lock);
1398                 break;
1399         case QCOM_SSR_AFTER_POWERUP:
1400         case SERVREG_SERVICE_STATE_UP:
1401                 schedule_work(&ctrl->ngd_up_work);
1402                 break;
1403         default:
1404                 break;
1405         }
1406
1407         return NOTIFY_OK;
1408 }
1409
1410 static int qcom_slim_ngd_ssr_notify(struct notifier_block *nb,
1411                                     unsigned long action,
1412                                     void *data)
1413 {
1414         struct qcom_slim_ngd_ctrl *ctrl = container_of(nb,
1415                                                struct qcom_slim_ngd_ctrl, nb);
1416
1417         return qcom_slim_ngd_ssr_pdr_notify(ctrl, action);
1418 }
1419
1420 static void slim_pd_status(int state, char *svc_path, void *priv)
1421 {
1422         struct qcom_slim_ngd_ctrl *ctrl = (struct qcom_slim_ngd_ctrl *)priv;
1423
1424         qcom_slim_ngd_ssr_pdr_notify(ctrl, state);
1425 }
1426 static int of_qcom_slim_ngd_register(struct device *parent,
1427                                      struct qcom_slim_ngd_ctrl *ctrl)
1428 {
1429         const struct ngd_reg_offset_data *data;
1430         struct qcom_slim_ngd *ngd;
1431         const struct of_device_id *match;
1432         struct device_node *node;
1433         u32 id;
1434
1435         match = of_match_node(qcom_slim_ngd_dt_match, parent->of_node);
1436         data = match->data;
1437         for_each_available_child_of_node(parent->of_node, node) {
1438                 if (of_property_read_u32(node, "reg", &id))
1439                         continue;
1440
1441                 ngd = kzalloc(sizeof(*ngd), GFP_KERNEL);
1442                 if (!ngd) {
1443                         of_node_put(node);
1444                         return -ENOMEM;
1445                 }
1446
1447                 ngd->pdev = platform_device_alloc(QCOM_SLIM_NGD_DRV_NAME, id);
1448                 if (!ngd->pdev) {
1449                         kfree(ngd);
1450                         of_node_put(node);
1451                         return -ENOMEM;
1452                 }
1453                 ngd->id = id;
1454                 ngd->pdev->dev.parent = parent;
1455                 ngd->pdev->driver_override = QCOM_SLIM_NGD_DRV_NAME;
1456                 ngd->pdev->dev.of_node = node;
1457                 ctrl->ngd = ngd;
1458
1459                 platform_device_add(ngd->pdev);
1460                 ngd->base = ctrl->base + ngd->id * data->offset +
1461                                         (ngd->id - 1) * data->size;
1462
1463                 return 0;
1464         }
1465
1466         return -ENODEV;
1467 }
1468
1469 static int qcom_slim_ngd_probe(struct platform_device *pdev)
1470 {
1471         struct device *dev = &pdev->dev;
1472         struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev->parent);
1473         int ret;
1474
1475         ctrl->ctrl.dev = dev;
1476
1477         platform_set_drvdata(pdev, ctrl);
1478         pm_runtime_use_autosuspend(dev);
1479         pm_runtime_set_autosuspend_delay(dev, QCOM_SLIM_NGD_AUTOSUSPEND);
1480         pm_runtime_set_suspended(dev);
1481         pm_runtime_enable(dev);
1482         pm_runtime_get_noresume(dev);
1483         ret = qcom_slim_ngd_qmi_svc_event_init(ctrl);
1484         if (ret) {
1485                 dev_err(&pdev->dev, "QMI service registration failed:%d", ret);
1486                 return ret;
1487         }
1488
1489         INIT_WORK(&ctrl->m_work, qcom_slim_ngd_master_worker);
1490         INIT_WORK(&ctrl->ngd_up_work, qcom_slim_ngd_up_worker);
1491         ctrl->mwq = create_singlethread_workqueue("ngd_master");
1492         if (!ctrl->mwq) {
1493                 dev_err(&pdev->dev, "Failed to start master worker\n");
1494                 ret = -ENOMEM;
1495                 goto wq_err;
1496         }
1497
1498         return 0;
1499 wq_err:
1500         qcom_slim_ngd_qmi_svc_event_deinit(&ctrl->qmi);
1501         if (ctrl->mwq)
1502                 destroy_workqueue(ctrl->mwq);
1503
1504         return ret;
1505 }
1506
1507 static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
1508 {
1509         struct device *dev = &pdev->dev;
1510         struct qcom_slim_ngd_ctrl *ctrl;
1511         struct resource *res;
1512         int ret;
1513         struct pdr_service *pds;
1514
1515         ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
1516         if (!ctrl)
1517                 return -ENOMEM;
1518
1519         dev_set_drvdata(dev, ctrl);
1520
1521         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1522         ctrl->base = devm_ioremap_resource(dev, res);
1523         if (IS_ERR(ctrl->base))
1524                 return PTR_ERR(ctrl->base);
1525
1526         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1527         if (!res) {
1528                 dev_err(&pdev->dev, "no slimbus IRQ resource\n");
1529                 return -ENODEV;
1530         }
1531
1532         ret = devm_request_irq(dev, res->start, qcom_slim_ngd_interrupt,
1533                                IRQF_TRIGGER_HIGH, "slim-ngd", ctrl);
1534         if (ret) {
1535                 dev_err(&pdev->dev, "request IRQ failed\n");
1536                 return ret;
1537         }
1538
1539         ctrl->nb.notifier_call = qcom_slim_ngd_ssr_notify;
1540         ctrl->notifier = qcom_register_ssr_notifier("lpass", &ctrl->nb);
1541         if (IS_ERR(ctrl->notifier))
1542                 return PTR_ERR(ctrl->notifier);
1543
1544         ctrl->dev = dev;
1545         ctrl->framer.rootfreq = SLIM_ROOT_FREQ >> 3;
1546         ctrl->framer.superfreq =
1547                 ctrl->framer.rootfreq / SLIM_CL_PER_SUPERFRAME_DIV8;
1548
1549         ctrl->ctrl.a_framer = &ctrl->framer;
1550         ctrl->ctrl.clkgear = SLIM_MAX_CLK_GEAR;
1551         ctrl->ctrl.get_laddr = qcom_slim_ngd_get_laddr;
1552         ctrl->ctrl.enable_stream = qcom_slim_ngd_enable_stream;
1553         ctrl->ctrl.xfer_msg = qcom_slim_ngd_xfer_msg;
1554         ctrl->ctrl.wakeup = NULL;
1555         ctrl->state = QCOM_SLIM_NGD_CTRL_DOWN;
1556
1557         mutex_init(&ctrl->tx_lock);
1558         mutex_init(&ctrl->ssr_lock);
1559         spin_lock_init(&ctrl->tx_buf_lock);
1560         init_completion(&ctrl->reconf);
1561         init_completion(&ctrl->qmi.qmi_comp);
1562         init_completion(&ctrl->qmi_up);
1563
1564         ctrl->pdr = pdr_handle_alloc(slim_pd_status, ctrl);
1565         if (IS_ERR(ctrl->pdr)) {
1566                 dev_err(dev, "Failed to init PDR handle\n");
1567                 return PTR_ERR(ctrl->pdr);
1568         }
1569
1570         pds = pdr_add_lookup(ctrl->pdr, "avs/audio", "msm/adsp/audio_pd");
1571         if (IS_ERR(pds) && PTR_ERR(pds) != -EALREADY) {
1572                 dev_err(dev, "pdr add lookup failed: %d\n", ret);
1573                 return PTR_ERR(pds);
1574         }
1575
1576         platform_driver_register(&qcom_slim_ngd_driver);
1577         return of_qcom_slim_ngd_register(dev, ctrl);
1578 }
1579
1580 static int qcom_slim_ngd_ctrl_remove(struct platform_device *pdev)
1581 {
1582         platform_driver_unregister(&qcom_slim_ngd_driver);
1583
1584         return 0;
1585 }
1586
1587 static int qcom_slim_ngd_remove(struct platform_device *pdev)
1588 {
1589         struct qcom_slim_ngd_ctrl *ctrl = platform_get_drvdata(pdev);
1590
1591         pm_runtime_disable(&pdev->dev);
1592         pdr_handle_release(ctrl->pdr);
1593         qcom_unregister_ssr_notifier(ctrl->notifier, &ctrl->nb);
1594         qcom_slim_ngd_enable(ctrl, false);
1595         qcom_slim_ngd_exit_dma(ctrl);
1596         qcom_slim_ngd_qmi_svc_event_deinit(&ctrl->qmi);
1597         if (ctrl->mwq)
1598                 destroy_workqueue(ctrl->mwq);
1599
1600         kfree(ctrl->ngd);
1601         ctrl->ngd = NULL;
1602         return 0;
1603 }
1604
1605 static int __maybe_unused qcom_slim_ngd_runtime_idle(struct device *dev)
1606 {
1607         struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev);
1608
1609         if (ctrl->state == QCOM_SLIM_NGD_CTRL_AWAKE)
1610                 ctrl->state = QCOM_SLIM_NGD_CTRL_IDLE;
1611         pm_request_autosuspend(dev);
1612         return -EAGAIN;
1613 }
1614
1615 static int __maybe_unused qcom_slim_ngd_runtime_suspend(struct device *dev)
1616 {
1617         struct qcom_slim_ngd_ctrl *ctrl = dev_get_drvdata(dev);
1618         int ret = 0;
1619
1620         if (!ctrl->qmi.handle)
1621                 return 0;
1622
1623         ret = qcom_slim_qmi_power_request(ctrl, false);
1624         if (ret && ret != -EBUSY)
1625                 dev_info(ctrl->dev, "slim resource not idle:%d\n", ret);
1626         if (!ret || ret == -ETIMEDOUT)
1627                 ctrl->state = QCOM_SLIM_NGD_CTRL_ASLEEP;
1628
1629         return ret;
1630 }
1631
1632 static const struct dev_pm_ops qcom_slim_ngd_dev_pm_ops = {
1633         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1634                                 pm_runtime_force_resume)
1635         SET_RUNTIME_PM_OPS(
1636                 qcom_slim_ngd_runtime_suspend,
1637                 qcom_slim_ngd_runtime_resume,
1638                 qcom_slim_ngd_runtime_idle
1639         )
1640 };
1641
1642 static struct platform_driver qcom_slim_ngd_ctrl_driver = {
1643         .probe = qcom_slim_ngd_ctrl_probe,
1644         .remove = qcom_slim_ngd_ctrl_remove,
1645         .driver = {
1646                 .name = "qcom,slim-ngd-ctrl",
1647                 .of_match_table = qcom_slim_ngd_dt_match,
1648         },
1649 };
1650
1651 static struct platform_driver qcom_slim_ngd_driver = {
1652         .probe = qcom_slim_ngd_probe,
1653         .remove = qcom_slim_ngd_remove,
1654         .driver = {
1655                 .name = QCOM_SLIM_NGD_DRV_NAME,
1656                 .pm = &qcom_slim_ngd_dev_pm_ops,
1657         },
1658 };
1659
1660 module_platform_driver(qcom_slim_ngd_ctrl_driver);
1661 MODULE_LICENSE("GPL v2");
1662 MODULE_DESCRIPTION("Qualcomm SLIMBus NGD controller");