drivers/soc/qcom/qcom_aoss.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2019, Linaro Ltd
   4  */
   5 #include <dt-bindings/power/qcom-aoss-qmp.h>
   6 #include <linux/clk-provider.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/io.h>
   9 #include <linux/mailbox_client.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_domain.h>
  13 #include <linux/thermal.h>
  14 #include <linux/slab.h>
  15
  16 #define QMP_DESC_MAGIC                  0x0
  17 #define QMP_DESC_VERSION                0x4
  18 #define QMP_DESC_FEATURES               0x8
  19
  20 /* AOP-side offsets */
  21 #define QMP_DESC_UCORE_LINK_STATE       0xc
  22 #define QMP_DESC_UCORE_LINK_STATE_ACK   0x10
  23 #define QMP_DESC_UCORE_CH_STATE         0x14
  24 #define QMP_DESC_UCORE_CH_STATE_ACK     0x18
  25 #define QMP_DESC_UCORE_MBOX_SIZE        0x1c
  26 #define QMP_DESC_UCORE_MBOX_OFFSET      0x20
  27
  28 /* Linux-side offsets */
  29 #define QMP_DESC_MCORE_LINK_STATE       0x24
  30 #define QMP_DESC_MCORE_LINK_STATE_ACK   0x28
  31 #define QMP_DESC_MCORE_CH_STATE         0x2c
  32 #define QMP_DESC_MCORE_CH_STATE_ACK     0x30
  33 #define QMP_DESC_MCORE_MBOX_SIZE        0x34
  34 #define QMP_DESC_MCORE_MBOX_OFFSET      0x38
  35
  36 #define QMP_STATE_UP                    GENMASK(15, 0)
  37 #define QMP_STATE_DOWN                  GENMASK(31, 16)
  38
  39 #define QMP_MAGIC                       0x4d41494c /* mail */
  40 #define QMP_VERSION                     1
  41
  42 /* 64 bytes is enough to store the requests and provides padding to 4 bytes */
  43 #define QMP_MSG_LEN                     64
  44
  45 #define QMP_NUM_COOLING_RESOURCES       2
  46
  47 static bool qmp_cdev_max_state = 1;
  48
  49 struct qmp_cooling_device {
  50         struct thermal_cooling_device *cdev;
  51         struct qmp *qmp;
  52         char *name;
  53         bool state;
  54 };
  55
  56 /**
  57  * struct qmp - driver state for QMP implementation
  58  * @msgram: iomem referencing the message RAM used for communication
  59  * @dev: reference to QMP device
  60  * @mbox_client: mailbox client used to ring the doorbell on transmit
  61  * @mbox_chan: mailbox channel used to ring the doorbell on transmit
  62  * @offset: offset within @msgram where messages should be written
  63  * @size: maximum size of the messages to be transmitted
  64  * @event: wait_queue for synchronization with the IRQ
  65  * @tx_lock: provides synchronization between multiple callers of qmp_send()
  66  * @qdss_clk: QDSS clock hw struct
  67  * @pd_data: genpd data
  68  * @cooling_devs: thermal cooling devices
  69  */
  70 struct qmp {
  71         void __iomem *msgram;
  72         struct device *dev;
  73
  74         struct mbox_client mbox_client;
  75         struct mbox_chan *mbox_chan;
  76
  77         size_t offset;
  78         size_t size;
  79
  80         wait_queue_head_t event;
  81
  82         struct mutex tx_lock;
  83
  84         struct clk_hw qdss_clk;
  85         struct genpd_onecell_data pd_data;
  86         struct qmp_cooling_device *cooling_devs;
  87 };
  88
  89 struct qmp_pd {
  90         struct qmp *qmp;
  91         struct generic_pm_domain pd;
  92 };
  93
  94 #define to_qmp_pd_resource(res) container_of(res, struct qmp_pd, pd)
  95
  96 static void qmp_kick(struct qmp *qmp)
  97 {
  98         mbox_send_message(qmp->mbox_chan, NULL);
  99         mbox_client_txdone(qmp->mbox_chan, 0);
 100 }
 101
 102 static bool qmp_magic_valid(struct qmp *qmp)
 103 {
 104         return readl(qmp->msgram + QMP_DESC_MAGIC) == QMP_MAGIC;
 105 }
 106
 107 static bool qmp_link_acked(struct qmp *qmp)
 108 {
 109         return readl(qmp->msgram + QMP_DESC_MCORE_LINK_STATE_ACK) == QMP_STATE_UP;
 110 }
 111
 112 static bool qmp_mcore_channel_acked(struct qmp *qmp)
 113 {
 114         return readl(qmp->msgram + QMP_DESC_MCORE_CH_STATE_ACK) == QMP_STATE_UP;
 115 }
 116
 117 static bool qmp_ucore_channel_up(struct qmp *qmp)
 118 {
 119         return readl(qmp->msgram + QMP_DESC_UCORE_CH_STATE) == QMP_STATE_UP;
 120 }
 121
 122 static int qmp_open(struct qmp *qmp)
 123 {
 124         int ret;
 125         u32 val;
 126
 127         if (!qmp_magic_valid(qmp)) {
 128                 dev_err(qmp->dev, "QMP magic doesn't match\n");
 129                 return -EINVAL;
 130         }
 131
 132         val = readl(qmp->msgram + QMP_DESC_VERSION);
 133         if (val != QMP_VERSION) {
 134                 dev_err(qmp->dev, "unsupported QMP version %d\n", val);
 135                 return -EINVAL;
 136         }
 137
 138         qmp->offset = readl(qmp->msgram + QMP_DESC_MCORE_MBOX_OFFSET);
 139         qmp->size = readl(qmp->msgram + QMP_DESC_MCORE_MBOX_SIZE);
 140         if (!qmp->size) {
 141                 dev_err(qmp->dev, "invalid mailbox size\n");
 142                 return -EINVAL;
 143         }
 144
 145         /* Ack remote core's link state */
 146         val = readl(qmp->msgram + QMP_DESC_UCORE_LINK_STATE);
 147         writel(val, qmp->msgram + QMP_DESC_UCORE_LINK_STATE_ACK);
 148
 149         /* Set local core's link state to up */
 150         writel(QMP_STATE_UP, qmp->msgram + QMP_DESC_MCORE_LINK_STATE);
 151
 152         qmp_kick(qmp);
 153
 154         ret = wait_event_timeout(qmp->event, qmp_link_acked(qmp), HZ);
 155         if (!ret) {
 156                 dev_err(qmp->dev, "ucore didn't ack link\n");
 157                 goto timeout_close_link;
 158         }
 159
 160         writel(QMP_STATE_UP, qmp->msgram + QMP_DESC_MCORE_CH_STATE);
 161
 162         qmp_kick(qmp);
 163
 164         ret = wait_event_timeout(qmp->event, qmp_ucore_channel_up(qmp), HZ);
 165         if (!ret) {
 166                 dev_err(qmp->dev, "ucore didn't open channel\n");
 167                 goto timeout_close_channel;
 168         }
 169
 170         /* Ack remote core's channel state */
 171         writel(QMP_STATE_UP, qmp->msgram + QMP_DESC_UCORE_CH_STATE_ACK);
 172
 173         qmp_kick(qmp);
 174
 175         ret = wait_event_timeout(qmp->event, qmp_mcore_channel_acked(qmp), HZ);
 176         if (!ret) {
 177                 dev_err(qmp->dev, "ucore didn't ack channel\n");
 178                 goto timeout_close_channel;
 179         }
 180
 181         return 0;
 182
 183 timeout_close_channel:
 184         writel(QMP_STATE_DOWN, qmp->msgram + QMP_DESC_MCORE_CH_STATE);
 185
 186 timeout_close_link:
 187         writel(QMP_STATE_DOWN, qmp->msgram + QMP_DESC_MCORE_LINK_STATE);
 188         qmp_kick(qmp);
 189
 190         return -ETIMEDOUT;
 191 }
 192
 193 static void qmp_close(struct qmp *qmp)
 194 {
 195         writel(QMP_STATE_DOWN, qmp->msgram + QMP_DESC_MCORE_CH_STATE);
 196         writel(QMP_STATE_DOWN, qmp->msgram + QMP_DESC_MCORE_LINK_STATE);
 197         qmp_kick(qmp);
 198 }
 199
 200 static irqreturn_t qmp_intr(int irq, void *data)
 201 {
 202         struct qmp *qmp = data;
 203
 204         wake_up_all(&qmp->event);
 205
 206         return IRQ_HANDLED;
 207 }
 208
 209 static bool qmp_message_empty(struct qmp *qmp)
 210 {
 211         return readl(qmp->msgram + qmp->offset) == 0;
 212 }
 213
 214 /**
 215  * qmp_send() - send a message to the AOSS
 216  * @qmp: qmp context
 217  * @data: message to be sent
 218  * @len: length of the message
 219  *
 220  * Transmit @data to AOSS and wait for the AOSS to acknowledge the message.
 221  * @len must be a multiple of 4 and not longer than the mailbox size. Access is
 222  * synchronized by this implementation.
 223  *
 224  * Return: 0 on success, negative errno on failure
 225  */
 226 static int qmp_send(struct qmp *qmp, const void *data, size_t len)
 227 {
 228         long time_left;
 229         int ret;
 230
 231         if (WARN_ON(len + sizeof(u32) > qmp->size))
 232                 return -EINVAL;
 233
 234         if (WARN_ON(len % sizeof(u32)))
 235                 return -EINVAL;
 236
 237         mutex_lock(&qmp->tx_lock);
 238
 239         /* The message RAM only implements 32-bit accesses */
 240         __iowrite32_copy(qmp->msgram + qmp->offset + sizeof(u32),
 241                          data, len / sizeof(u32));
 242         writel(len, qmp->msgram + qmp->offset);
 243
 244         /* Read back len to confirm data written in message RAM */
 245         readl(qmp->msgram + qmp->offset);
 246         qmp_kick(qmp);
 247
 248         time_left = wait_event_interruptible_timeout(qmp->event,
 249                                                      qmp_message_empty(qmp), HZ);
 250         if (!time_left) {
 251                 dev_err(qmp->dev, "ucore did not ack channel\n");
 252                 ret = -ETIMEDOUT;
 253
 254                 /* Clear message from buffer */
 255                 writel(0, qmp->msgram + qmp->offset);
 256         } else {
 257                 ret = 0;
 258         }
 259
 260         mutex_unlock(&qmp->tx_lock);
 261
 262         return ret;
 263 }
 264
 265 static int qmp_qdss_clk_prepare(struct clk_hw *hw)
 266 {
 267         static const char buf[QMP_MSG_LEN] = "{class: clock, res: qdss, val: 1}";
 268         struct qmp *qmp = container_of(hw, struct qmp, qdss_clk);
 269
 270         return qmp_send(qmp, buf, sizeof(buf));
 271 }
 272
 273 static void qmp_qdss_clk_unprepare(struct clk_hw *hw)
 274 {
 275         static const char buf[QMP_MSG_LEN] = "{class: clock, res: qdss, val: 0}";
 276         struct qmp *qmp = container_of(hw, struct qmp, qdss_clk);
 277
 278         qmp_send(qmp, buf, sizeof(buf));
 279 }
 280
 281 static const struct clk_ops qmp_qdss_clk_ops = {
 282         .prepare = qmp_qdss_clk_prepare,
 283         .unprepare = qmp_qdss_clk_unprepare,
 284 };
 285
 286 static int qmp_qdss_clk_add(struct qmp *qmp)
 287 {
 288         static const struct clk_init_data qdss_init = {
 289                 .ops = &qmp_qdss_clk_ops,
 290                 .name = "qdss",
 291         };
 292         int ret;
 293
 294         qmp->qdss_clk.init = &qdss_init;
 295         ret = clk_hw_register(qmp->dev, &qmp->qdss_clk);
 296         if (ret < 0) {
 297                 dev_err(qmp->dev, "failed to register qdss clock\n");
 298                 return ret;
 299         }
 300
 301         ret = of_clk_add_hw_provider(qmp->dev->of_node, of_clk_hw_simple_get,
 302                                      &qmp->qdss_clk);
 303         if (ret < 0) {
 304                 dev_err(qmp->dev, "unable to register of clk hw provider\n");
 305                 clk_hw_unregister(&qmp->qdss_clk);
 306         }
 307
 308         return ret;
 309 }
 310
 311 static void qmp_qdss_clk_remove(struct qmp *qmp)
 312 {
 313         of_clk_del_provider(qmp->dev->of_node);
 314         clk_hw_unregister(&qmp->qdss_clk);
 315 }
 316
 317 static int qmp_pd_power_toggle(struct qmp_pd *res, bool enable)
 318 {
 319         char buf[QMP_MSG_LEN] = {};
 320
 321         snprintf(buf, sizeof(buf),
 322                  "{class: image, res: load_state, name: %s, val: %s}",
 323                  res->pd.name, enable ? "on" : "off");
 324         return qmp_send(res->qmp, buf, sizeof(buf));
 325 }
 326
 327 static int qmp_pd_power_on(struct generic_pm_domain *domain)
 328 {
 329         return qmp_pd_power_toggle(to_qmp_pd_resource(domain), true);
 330 }
 331
 332 static int qmp_pd_power_off(struct generic_pm_domain *domain)
 333 {
 334         return qmp_pd_power_toggle(to_qmp_pd_resource(domain), false);
 335 }
 336
 337 static const char * const sdm845_resources[] = {
 338         [AOSS_QMP_LS_CDSP] = "cdsp",
 339         [AOSS_QMP_LS_LPASS] = "adsp",
 340         [AOSS_QMP_LS_MODEM] = "modem",
 341         [AOSS_QMP_LS_SLPI] = "slpi",
 342         [AOSS_QMP_LS_SPSS] = "spss",
 343         [AOSS_QMP_LS_VENUS] = "venus",
 344 };
 345
 346 static int qmp_pd_add(struct qmp *qmp)
 347 {
 348         struct genpd_onecell_data *data = &qmp->pd_data;
 349         struct device *dev = qmp->dev;
 350         struct qmp_pd *res;
 351         size_t num = ARRAY_SIZE(sdm845_resources);
 352         int ret;
 353         int i;
 354
 355         res = devm_kcalloc(dev, num, sizeof(*res), GFP_KERNEL);
 356         if (!res)
 357                 return -ENOMEM;
 358
 359         data->domains = devm_kcalloc(dev, num, sizeof(*data->domains),
 360                                      GFP_KERNEL);
 361         if (!data->domains)
 362                 return -ENOMEM;
 363
 364         for (i = 0; i < num; i++) {
 365                 res[i].qmp = qmp;
 366                 res[i].pd.name = sdm845_resources[i];
 367                 res[i].pd.power_on = qmp_pd_power_on;
 368                 res[i].pd.power_off = qmp_pd_power_off;
 369
 370                 ret = pm_genpd_init(&res[i].pd, NULL, true);
 371                 if (ret < 0) {
 372                         dev_err(dev, "failed to init genpd\n");
 373                         goto unroll_genpds;
 374                 }
 375
 376                 data->domains[i] = &res[i].pd;
 377         }
 378
 379         data->num_domains = i;
 380
 381         ret = of_genpd_add_provider_onecell(dev->of_node, data);
 382         if (ret < 0)
 383                 goto unroll_genpds;
 384
 385         return 0;
 386
 387 unroll_genpds:
 388         for (i--; i >= 0; i--)
 389                 pm_genpd_remove(data->domains[i]);
 390
 391         return ret;
 392 }
 393
 394 static void qmp_pd_remove(struct qmp *qmp)
 395 {
 396         struct genpd_onecell_data *data = &qmp->pd_data;
 397         struct device *dev = qmp->dev;
 398         int i;
 399
 400         of_genpd_del_provider(dev->of_node);
 401
 402         for (i = 0; i < data->num_domains; i++)
 403                 pm_genpd_remove(data->domains[i]);
 404 }
 405
 406 static int qmp_cdev_get_max_state(struct thermal_cooling_device *cdev,
 407                                   unsigned long *state)
 408 {
 409         *state = qmp_cdev_max_state;
 410         return 0;
 411 }
 412
 413 static int qmp_cdev_get_cur_state(struct thermal_cooling_device *cdev,
 414                                   unsigned long *state)
 415 {
 416         struct qmp_cooling_device *qmp_cdev = cdev->devdata;
 417
 418         *state = qmp_cdev->state;
 419         return 0;
 420 }
 421
 422 static int qmp_cdev_set_cur_state(struct thermal_cooling_device *cdev,
 423                                   unsigned long state)
 424 {
 425         struct qmp_cooling_device *qmp_cdev = cdev->devdata;
 426         char buf[QMP_MSG_LEN] = {};
 427         bool cdev_state;
 428         int ret;
 429
 430         /* Normalize state */
 431         cdev_state = !!state;
 432
 433         if (qmp_cdev->state == state)
 434                 return 0;
 435
 436         snprintf(buf, sizeof(buf),
 437                  "{class: volt_flr, event:zero_temp, res:%s, value:%s}",
 438                         qmp_cdev->name,
 439                         cdev_state ? "on" : "off");
 440
 441         ret = qmp_send(qmp_cdev->qmp, buf, sizeof(buf));
 442
 443         if (!ret)
 444                 qmp_cdev->state = cdev_state;
 445
 446         return ret;
 447 }
 448
 449 static struct thermal_cooling_device_ops qmp_cooling_device_ops = {
 450         .get_max_state = qmp_cdev_get_max_state,
 451         .get_cur_state = qmp_cdev_get_cur_state,
 452         .set_cur_state = qmp_cdev_set_cur_state,
 453 };
 454
 455 static int qmp_cooling_device_add(struct qmp *qmp,
 456                                   struct qmp_cooling_device *qmp_cdev,
 457                                   struct device_node *node)
 458 {
 459         char *cdev_name = (char *)node->name;
 460
 461         qmp_cdev->qmp = qmp;
 462         qmp_cdev->state = !qmp_cdev_max_state;
 463         qmp_cdev->name = cdev_name;
 464         qmp_cdev->cdev = devm_thermal_of_cooling_device_register
 465                                 (qmp->dev, node,
 466                                 cdev_name,
 467                                 qmp_cdev, &qmp_cooling_device_ops);
 468
 469         if (IS_ERR(qmp_cdev->cdev))
 470                 dev_err(qmp->dev, "unable to register %s cooling device\n",
 471                         cdev_name);
 472
 473         return PTR_ERR_OR_ZERO(qmp_cdev->cdev);
 474 }
 475
 476 static int qmp_cooling_devices_register(struct qmp *qmp)
 477 {
 478         struct device_node *np, *child;
 479         int count = QMP_NUM_COOLING_RESOURCES;
 480         int ret;
 481
 482         np = qmp->dev->of_node;
 483
 484         qmp->cooling_devs = devm_kcalloc(qmp->dev, count,
 485                                          sizeof(*qmp->cooling_devs),
 486                                          GFP_KERNEL);
 487
 488         if (!qmp->cooling_devs)
 489                 return -ENOMEM;
 490
 491         for_each_available_child_of_node(np, child) {
 492                 if (!of_find_property(child, "#cooling-cells", NULL))
 493                         continue;
 494                 ret = qmp_cooling_device_add(qmp, &qmp->cooling_devs[count++],
 495                                              child);
 496                 if (ret)
 497                         goto unroll;
 498         }
 499
 500         return 0;
 501
 502 unroll:
 503         while (--count >= 0)
 504                 thermal_cooling_device_unregister
 505                         (qmp->cooling_devs[count].cdev);
 506
 507         return ret;
 508 }
 509
 510 static void qmp_cooling_devices_remove(struct qmp *qmp)
 511 {
 512         int i;
 513
 514         for (i = 0; i < QMP_NUM_COOLING_RESOURCES; i++)
 515                 thermal_cooling_device_unregister(qmp->cooling_devs[i].cdev);
 516 }
 517
 518 static int qmp_probe(struct platform_device *pdev)
 519 {
 520         struct resource *res;
 521         struct qmp *qmp;
 522         int irq;
 523         int ret;
 524
 525         qmp = devm_kzalloc(&pdev->dev, sizeof(*qmp), GFP_KERNEL);
 526         if (!qmp)
 527                 return -ENOMEM;
 528
 529         qmp->dev = &pdev->dev;
 530         init_waitqueue_head(&qmp->event);
 531         mutex_init(&qmp->tx_lock);
 532
 533         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 534         qmp->msgram = devm_ioremap_resource(&pdev->dev, res);
 535         if (IS_ERR(qmp->msgram))
 536                 return PTR_ERR(qmp->msgram);
 537
 538         qmp->mbox_client.dev = &pdev->dev;
 539         qmp->mbox_client.knows_txdone = true;
 540         qmp->mbox_chan = mbox_request_channel(&qmp->mbox_client, 0);
 541         if (IS_ERR(qmp->mbox_chan)) {
 542                 dev_err(&pdev->dev, "failed to acquire ipc mailbox\n");
 543                 return PTR_ERR(qmp->mbox_chan);
 544         }
 545
 546         irq = platform_get_irq(pdev, 0);
 547         ret = devm_request_irq(&pdev->dev, irq, qmp_intr, IRQF_ONESHOT,
 548                                "aoss-qmp", qmp);
 549         if (ret < 0) {
 550                 dev_err(&pdev->dev, "failed to request interrupt\n");
 551                 goto err_free_mbox;
 552         }
 553
 554         ret = qmp_open(qmp);
 555         if (ret < 0)
 556                 goto err_free_mbox;
 557
 558         ret = qmp_qdss_clk_add(qmp);
 559         if (ret)
 560                 goto err_close_qmp;
 561
 562         ret = qmp_pd_add(qmp);
 563         if (ret)
 564                 goto err_remove_qdss_clk;
 565
 566         ret = qmp_cooling_devices_register(qmp);
 567         if (ret)
 568                 dev_err(&pdev->dev, "failed to register aoss cooling devices\n");
 569
 570         platform_set_drvdata(pdev, qmp);
 571
 572         return 0;
 573
 574 err_remove_qdss_clk:
 575         qmp_qdss_clk_remove(qmp);
 576 err_close_qmp:
 577         qmp_close(qmp);
 578 err_free_mbox:
 579         mbox_free_channel(qmp->mbox_chan);
 580
 581         return ret;
 582 }
 583
 584 static int qmp_remove(struct platform_device *pdev)
 585 {
 586         struct qmp *qmp = platform_get_drvdata(pdev);
 587
 588         qmp_qdss_clk_remove(qmp);
 589         qmp_pd_remove(qmp);
 590         qmp_cooling_devices_remove(qmp);
 591
 592         qmp_close(qmp);
 593         mbox_free_channel(qmp->mbox_chan);
 594
 595         return 0;
 596 }
 597
 598 static const struct of_device_id qmp_dt_match[] = {
 599         { .compatible = "qcom,sc7180-aoss-qmp", },
 600         { .compatible = "qcom,sdm845-aoss-qmp", },
 601         { .compatible = "qcom,sm8150-aoss-qmp", },
 602         { .compatible = "qcom,sm8250-aoss-qmp", },
 603         {}
 604 };
 605 MODULE_DEVICE_TABLE(of, qmp_dt_match);
 606
 607 static struct platform_driver qmp_driver = {
 608         .driver = {
 609                 .name           = "qcom_aoss_qmp",
 610                 .of_match_table = qmp_dt_match,
 611         },
 612         .probe = qmp_probe,
 613         .remove = qmp_remove,
 614 };
 615 module_platform_driver(qmp_driver);
 616
 617 MODULE_DESCRIPTION("Qualcomm AOSS QMP driver");
 618 MODULE_LICENSE("GPL v2");