drivers/remoteproc/qcom_wcnss.c

   1 /*
   2  * Qualcomm Wireless Connectivity Subsystem Peripheral Image Loader
   3  *
   4  * Copyright (C) 2016 Linaro Ltd
   5  * Copyright (C) 2014 Sony Mobile Communications AB
   6  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/clk.h>
  19 #include <linux/delay.h>
  20 #include <linux/firmware.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/io.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_device.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/qcom_scm.h>
  29 #include <linux/regulator/consumer.h>
  30 #include <linux/remoteproc.h>
  31 #include <linux/soc/qcom/mdt_loader.h>
  32 #include <linux/soc/qcom/smem.h>
  33 #include <linux/soc/qcom/smem_state.h>
  34 #include <linux/rpmsg/qcom_smd.h>
  35
  36 #include "qcom_common.h"
  37 #include "remoteproc_internal.h"
  38 #include "qcom_wcnss.h"
  39
  40 #define WCNSS_CRASH_REASON_SMEM         422
  41 #define WCNSS_FIRMWARE_NAME             "wcnss.mdt"
  42 #define WCNSS_PAS_ID                    6
  43 #define WCNSS_SSCTL_ID                  0x13
  44
  45 #define WCNSS_SPARE_NVBIN_DLND          BIT(25)
  46
  47 #define WCNSS_PMU_IRIS_XO_CFG           BIT(3)
  48 #define WCNSS_PMU_IRIS_XO_EN            BIT(4)
  49 #define WCNSS_PMU_GC_BUS_MUX_SEL_TOP    BIT(5)
  50 #define WCNSS_PMU_IRIS_XO_CFG_STS       BIT(6) /* 1: in progress, 0: done */
  51
  52 #define WCNSS_PMU_IRIS_RESET            BIT(7)
  53 #define WCNSS_PMU_IRIS_RESET_STS        BIT(8) /* 1: in progress, 0: done */
  54 #define WCNSS_PMU_IRIS_XO_READ          BIT(9)
  55 #define WCNSS_PMU_IRIS_XO_READ_STS      BIT(10)
  56
  57 #define WCNSS_PMU_XO_MODE_MASK          GENMASK(2, 1)
  58 #define WCNSS_PMU_XO_MODE_19p2          0
  59 #define WCNSS_PMU_XO_MODE_48            3
  60
  61 struct wcnss_data {
  62         size_t pmu_offset;
  63         size_t spare_offset;
  64
  65         const struct wcnss_vreg_info *vregs;
  66         size_t num_vregs;
  67 };
  68
  69 struct qcom_wcnss {
  70         struct device *dev;
  71         struct rproc *rproc;
  72
  73         void __iomem *pmu_cfg;
  74         void __iomem *spare_out;
  75
  76         bool use_48mhz_xo;
  77
  78         int wdog_irq;
  79         int fatal_irq;
  80         int ready_irq;
  81         int handover_irq;
  82         int stop_ack_irq;
  83
  84         struct qcom_smem_state *state;
  85         unsigned stop_bit;
  86
  87         struct mutex iris_lock;
  88         struct qcom_iris *iris;
  89
  90         struct regulator_bulk_data *vregs;
  91         size_t num_vregs;
  92
  93         struct completion start_done;
  94         struct completion stop_done;
  95
  96         phys_addr_t mem_phys;
  97         phys_addr_t mem_reloc;
  98         void *mem_region;
  99         size_t mem_size;
 100
 101         struct qcom_rproc_subdev smd_subdev;
 102         struct qcom_sysmon *sysmon;
 103 };
 104
 105 static const struct wcnss_data riva_data = {
 106         .pmu_offset = 0x28,
 107         .spare_offset = 0xb4,
 108
 109         .vregs = (struct wcnss_vreg_info[]) {
 110                 { "vddmx",  1050000, 1150000, 0 },
 111                 { "vddcx",  1050000, 1150000, 0 },
 112                 { "vddpx",  1800000, 1800000, 0 },
 113         },
 114         .num_vregs = 3,
 115 };
 116
 117 static const struct wcnss_data pronto_v1_data = {
 118         .pmu_offset = 0x1004,
 119         .spare_offset = 0x1088,
 120
 121         .vregs = (struct wcnss_vreg_info[]) {
 122                 { "vddmx", 950000, 1150000, 0 },
 123                 { "vddcx", .super_turbo = true},
 124                 { "vddpx", 1800000, 1800000, 0 },
 125         },
 126         .num_vregs = 3,
 127 };
 128
 129 static const struct wcnss_data pronto_v2_data = {
 130         .pmu_offset = 0x1004,
 131         .spare_offset = 0x1088,
 132
 133         .vregs = (struct wcnss_vreg_info[]) {
 134                 { "vddmx", 1287500, 1287500, 0 },
 135                 { "vddcx", .super_turbo = true },
 136                 { "vddpx", 1800000, 1800000, 0 },
 137         },
 138         .num_vregs = 3,
 139 };
 140
 141 void qcom_wcnss_assign_iris(struct qcom_wcnss *wcnss,
 142                             struct qcom_iris *iris,
 143                             bool use_48mhz_xo)
 144 {
 145         mutex_lock(&wcnss->iris_lock);
 146
 147         wcnss->iris = iris;
 148         wcnss->use_48mhz_xo = use_48mhz_xo;
 149
 150         mutex_unlock(&wcnss->iris_lock);
 151 }
 152
 153 static int wcnss_load(struct rproc *rproc, const struct firmware *fw)
 154 {
 155         struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv;
 156
 157         return qcom_mdt_load(wcnss->dev, fw, rproc->firmware, WCNSS_PAS_ID,
 158                              wcnss->mem_region, wcnss->mem_phys,
 159                              wcnss->mem_size, &wcnss->mem_reloc);
 160 }
 161
 162 static void wcnss_indicate_nv_download(struct qcom_wcnss *wcnss)
 163 {
 164         u32 val;
 165
 166         /* Indicate NV download capability */
 167         val = readl(wcnss->spare_out);
 168         val |= WCNSS_SPARE_NVBIN_DLND;
 169         writel(val, wcnss->spare_out);
 170 }
 171
 172 static void wcnss_configure_iris(struct qcom_wcnss *wcnss)
 173 {
 174         u32 val;
 175
 176         /* Clear PMU cfg register */
 177         writel(0, wcnss->pmu_cfg);
 178
 179         val = WCNSS_PMU_GC_BUS_MUX_SEL_TOP | WCNSS_PMU_IRIS_XO_EN;
 180         writel(val, wcnss->pmu_cfg);
 181
 182         /* Clear XO_MODE */
 183         val &= ~WCNSS_PMU_XO_MODE_MASK;
 184         if (wcnss->use_48mhz_xo)
 185                 val |= WCNSS_PMU_XO_MODE_48 << 1;
 186         else
 187                 val |= WCNSS_PMU_XO_MODE_19p2 << 1;
 188         writel(val, wcnss->pmu_cfg);
 189
 190         /* Reset IRIS */
 191         val |= WCNSS_PMU_IRIS_RESET;
 192         writel(val, wcnss->pmu_cfg);
 193
 194         /* Wait for PMU.iris_reg_reset_sts */
 195         while (readl(wcnss->pmu_cfg) & WCNSS_PMU_IRIS_RESET_STS)
 196                 cpu_relax();
 197
 198         /* Clear IRIS reset */
 199         val &= ~WCNSS_PMU_IRIS_RESET;
 200         writel(val, wcnss->pmu_cfg);
 201
 202         /* Start IRIS XO configuration */
 203         val |= WCNSS_PMU_IRIS_XO_CFG;
 204         writel(val, wcnss->pmu_cfg);
 205
 206         /* Wait for XO configuration to finish */
 207         while (readl(wcnss->pmu_cfg) & WCNSS_PMU_IRIS_XO_CFG_STS)
 208                 cpu_relax();
 209
 210         /* Stop IRIS XO configuration */
 211         val &= ~WCNSS_PMU_GC_BUS_MUX_SEL_TOP;
 212         val &= ~WCNSS_PMU_IRIS_XO_CFG;
 213         writel(val, wcnss->pmu_cfg);
 214
 215         /* Add some delay for XO to settle */
 216         msleep(20);
 217 }
 218
 219 static int wcnss_start(struct rproc *rproc)
 220 {
 221         struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv;
 222         int ret;
 223
 224         mutex_lock(&wcnss->iris_lock);
 225         if (!wcnss->iris) {
 226                 dev_err(wcnss->dev, "no iris registered\n");
 227                 ret = -EINVAL;
 228                 goto release_iris_lock;
 229         }
 230
 231         ret = regulator_bulk_enable(wcnss->num_vregs, wcnss->vregs);
 232         if (ret)
 233                 goto release_iris_lock;
 234
 235         ret = qcom_iris_enable(wcnss->iris);
 236         if (ret)
 237                 goto disable_regulators;
 238
 239         wcnss_indicate_nv_download(wcnss);
 240         wcnss_configure_iris(wcnss);
 241
 242         ret = qcom_scm_pas_auth_and_reset(WCNSS_PAS_ID);
 243         if (ret) {
 244                 dev_err(wcnss->dev,
 245                         "failed to authenticate image and release reset\n");
 246                 goto disable_iris;
 247         }
 248
 249         ret = wait_for_completion_timeout(&wcnss->start_done,
 250                                           msecs_to_jiffies(5000));
 251         if (wcnss->ready_irq > 0 && ret == 0) {
 252                 /* We have a ready_irq, but it didn't fire in time. */
 253                 dev_err(wcnss->dev, "start timed out\n");
 254                 qcom_scm_pas_shutdown(WCNSS_PAS_ID);
 255                 ret = -ETIMEDOUT;
 256                 goto disable_iris;
 257         }
 258
 259         ret = 0;
 260
 261 disable_iris:
 262         qcom_iris_disable(wcnss->iris);
 263 disable_regulators:
 264         regulator_bulk_disable(wcnss->num_vregs, wcnss->vregs);
 265 release_iris_lock:
 266         mutex_unlock(&wcnss->iris_lock);
 267
 268         return ret;
 269 }
 270
 271 static int wcnss_stop(struct rproc *rproc)
 272 {
 273         struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv;
 274         int ret;
 275
 276         if (wcnss->state) {
 277                 qcom_smem_state_update_bits(wcnss->state,
 278                                             BIT(wcnss->stop_bit),
 279                                             BIT(wcnss->stop_bit));
 280
 281                 ret = wait_for_completion_timeout(&wcnss->stop_done,
 282                                                   msecs_to_jiffies(5000));
 283                 if (ret == 0)
 284                         dev_err(wcnss->dev, "timed out on wait\n");
 285
 286                 qcom_smem_state_update_bits(wcnss->state,
 287                                             BIT(wcnss->stop_bit),
 288                                             0);
 289         }
 290
 291         ret = qcom_scm_pas_shutdown(WCNSS_PAS_ID);
 292         if (ret)
 293                 dev_err(wcnss->dev, "failed to shutdown: %d\n", ret);
 294
 295         return ret;
 296 }
 297
 298 static void *wcnss_da_to_va(struct rproc *rproc, u64 da, int len)
 299 {
 300         struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv;
 301         int offset;
 302
 303         offset = da - wcnss->mem_reloc;
 304         if (offset < 0 || offset + len > wcnss->mem_size)
 305                 return NULL;
 306
 307         return wcnss->mem_region + offset;
 308 }
 309
 310 static const struct rproc_ops wcnss_ops = {
 311         .start = wcnss_start,
 312         .stop = wcnss_stop,
 313         .da_to_va = wcnss_da_to_va,
 314         .parse_fw = qcom_register_dump_segments,
 315         .load = wcnss_load,
 316 };
 317
 318 static irqreturn_t wcnss_wdog_interrupt(int irq, void *dev)
 319 {
 320         struct qcom_wcnss *wcnss = dev;
 321
 322         rproc_report_crash(wcnss->rproc, RPROC_WATCHDOG);
 323
 324         return IRQ_HANDLED;
 325 }
 326
 327 static irqreturn_t wcnss_fatal_interrupt(int irq, void *dev)
 328 {
 329         struct qcom_wcnss *wcnss = dev;
 330         size_t len;
 331         char *msg;
 332
 333         msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, WCNSS_CRASH_REASON_SMEM, &len);
 334         if (!IS_ERR(msg) && len > 0 && msg[0])
 335                 dev_err(wcnss->dev, "fatal error received: %s\n", msg);
 336
 337         rproc_report_crash(wcnss->rproc, RPROC_FATAL_ERROR);
 338
 339         return IRQ_HANDLED;
 340 }
 341
 342 static irqreturn_t wcnss_ready_interrupt(int irq, void *dev)
 343 {
 344         struct qcom_wcnss *wcnss = dev;
 345
 346         complete(&wcnss->start_done);
 347
 348         return IRQ_HANDLED;
 349 }
 350
 351 static irqreturn_t wcnss_handover_interrupt(int irq, void *dev)
 352 {
 353         /*
 354          * XXX: At this point we're supposed to release the resources that we
 355          * have been holding on behalf of the WCNSS. Unfortunately this
 356          * interrupt comes way before the other side seems to be done.
 357          *
 358          * So we're currently relying on the ready interrupt firing later then
 359          * this and we just disable the resources at the end of wcnss_start().
 360          */
 361
 362         return IRQ_HANDLED;
 363 }
 364
 365 static irqreturn_t wcnss_stop_ack_interrupt(int irq, void *dev)
 366 {
 367         struct qcom_wcnss *wcnss = dev;
 368
 369         complete(&wcnss->stop_done);
 370
 371         return IRQ_HANDLED;
 372 }
 373
 374 static int wcnss_init_regulators(struct qcom_wcnss *wcnss,
 375                                  const struct wcnss_vreg_info *info,
 376                                  int num_vregs)
 377 {
 378         struct regulator_bulk_data *bulk;
 379         int ret;
 380         int i;
 381
 382         bulk = devm_kcalloc(wcnss->dev,
 383                             num_vregs, sizeof(struct regulator_bulk_data),
 384                             GFP_KERNEL);
 385         if (!bulk)
 386                 return -ENOMEM;
 387
 388         for (i = 0; i < num_vregs; i++)
 389                 bulk[i].supply = info[i].name;
 390
 391         ret = devm_regulator_bulk_get(wcnss->dev, num_vregs, bulk);
 392         if (ret)
 393                 return ret;
 394
 395         for (i = 0; i < num_vregs; i++) {
 396                 if (info[i].max_voltage)
 397                         regulator_set_voltage(bulk[i].consumer,
 398                                               info[i].min_voltage,
 399                                               info[i].max_voltage);
 400
 401                 if (info[i].load_uA)
 402                         regulator_set_load(bulk[i].consumer, info[i].load_uA);
 403         }
 404
 405         wcnss->vregs = bulk;
 406         wcnss->num_vregs = num_vregs;
 407
 408         return 0;
 409 }
 410
 411 static int wcnss_request_irq(struct qcom_wcnss *wcnss,
 412                              struct platform_device *pdev,
 413                              const char *name,
 414                              bool optional,
 415                              irq_handler_t thread_fn)
 416 {
 417         int ret;
 418
 419         ret = platform_get_irq_byname(pdev, name);
 420         if (ret < 0 && optional) {
 421                 dev_dbg(&pdev->dev, "no %s IRQ defined, ignoring\n", name);
 422                 return 0;
 423         } else if (ret < 0) {
 424                 dev_err(&pdev->dev, "no %s IRQ defined\n", name);
 425                 return ret;
 426         }
 427
 428         ret = devm_request_threaded_irq(&pdev->dev, ret,
 429                                         NULL, thread_fn,
 430                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 431                                         "wcnss", wcnss);
 432         if (ret)
 433                 dev_err(&pdev->dev, "request %s IRQ failed\n", name);
 434
 435         return ret;
 436 }
 437
 438 static int wcnss_alloc_memory_region(struct qcom_wcnss *wcnss)
 439 {
 440         struct device_node *node;
 441         struct resource r;
 442         int ret;
 443
 444         node = of_parse_phandle(wcnss->dev->of_node, "memory-region", 0);
 445         if (!node) {
 446                 dev_err(wcnss->dev, "no memory-region specified\n");
 447                 return -EINVAL;
 448         }
 449
 450         ret = of_address_to_resource(node, 0, &r);
 451         if (ret)
 452                 return ret;
 453
 454         wcnss->mem_phys = wcnss->mem_reloc = r.start;
 455         wcnss->mem_size = resource_size(&r);
 456         wcnss->mem_region = devm_ioremap_wc(wcnss->dev, wcnss->mem_phys, wcnss->mem_size);
 457         if (!wcnss->mem_region) {
 458                 dev_err(wcnss->dev, "unable to map memory region: %pa+%zx\n",
 459                         &r.start, wcnss->mem_size);
 460                 return -EBUSY;
 461         }
 462
 463         return 0;
 464 }
 465
 466 static int wcnss_probe(struct platform_device *pdev)
 467 {
 468         const struct wcnss_data *data;
 469         struct qcom_wcnss *wcnss;
 470         struct resource *res;
 471         struct rproc *rproc;
 472         void __iomem *mmio;
 473         int ret;
 474
 475         data = of_device_get_match_data(&pdev->dev);
 476
 477         if (!qcom_scm_is_available())
 478                 return -EPROBE_DEFER;
 479
 480         if (!qcom_scm_pas_supported(WCNSS_PAS_ID)) {
 481                 dev_err(&pdev->dev, "PAS is not available for WCNSS\n");
 482                 return -ENXIO;
 483         }
 484
 485         rproc = rproc_alloc(&pdev->dev, pdev->name, &wcnss_ops,
 486                             WCNSS_FIRMWARE_NAME, sizeof(*wcnss));
 487         if (!rproc) {
 488                 dev_err(&pdev->dev, "unable to allocate remoteproc\n");
 489                 return -ENOMEM;
 490         }
 491
 492         wcnss = (struct qcom_wcnss *)rproc->priv;
 493         wcnss->dev = &pdev->dev;
 494         wcnss->rproc = rproc;
 495         platform_set_drvdata(pdev, wcnss);
 496
 497         init_completion(&wcnss->start_done);
 498         init_completion(&wcnss->stop_done);
 499
 500         mutex_init(&wcnss->iris_lock);
 501
 502         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pmu");
 503         mmio = devm_ioremap_resource(&pdev->dev, res);
 504         if (IS_ERR(mmio)) {
 505                 ret = PTR_ERR(mmio);
 506                 goto free_rproc;
 507         };
 508
 509         ret = wcnss_alloc_memory_region(wcnss);
 510         if (ret)
 511                 goto free_rproc;
 512
 513         wcnss->pmu_cfg = mmio + data->pmu_offset;
 514         wcnss->spare_out = mmio + data->spare_offset;
 515
 516         ret = wcnss_init_regulators(wcnss, data->vregs, data->num_vregs);
 517         if (ret)
 518                 goto free_rproc;
 519
 520         ret = wcnss_request_irq(wcnss, pdev, "wdog", false, wcnss_wdog_interrupt);
 521         if (ret < 0)
 522                 goto free_rproc;
 523         wcnss->wdog_irq = ret;
 524
 525         ret = wcnss_request_irq(wcnss, pdev, "fatal", false, wcnss_fatal_interrupt);
 526         if (ret < 0)
 527                 goto free_rproc;
 528         wcnss->fatal_irq = ret;
 529
 530         ret = wcnss_request_irq(wcnss, pdev, "ready", true, wcnss_ready_interrupt);
 531         if (ret < 0)
 532                 goto free_rproc;
 533         wcnss->ready_irq = ret;
 534
 535         ret = wcnss_request_irq(wcnss, pdev, "handover", true, wcnss_handover_interrupt);
 536         if (ret < 0)
 537                 goto free_rproc;
 538         wcnss->handover_irq = ret;
 539
 540         ret = wcnss_request_irq(wcnss, pdev, "stop-ack", true, wcnss_stop_ack_interrupt);
 541         if (ret < 0)
 542                 goto free_rproc;
 543         wcnss->stop_ack_irq = ret;
 544
 545         if (wcnss->stop_ack_irq) {
 546                 wcnss->state = qcom_smem_state_get(&pdev->dev, "stop",
 547                                                    &wcnss->stop_bit);
 548                 if (IS_ERR(wcnss->state)) {
 549                         ret = PTR_ERR(wcnss->state);
 550                         goto free_rproc;
 551                 }
 552         }
 553
 554         qcom_add_smd_subdev(rproc, &wcnss->smd_subdev);
 555         wcnss->sysmon = qcom_add_sysmon_subdev(rproc, "wcnss", WCNSS_SSCTL_ID);
 556         if (IS_ERR(wcnss->sysmon)) {
 557                 ret = PTR_ERR(wcnss->sysmon);
 558                 goto free_rproc;
 559         }
 560
 561         ret = rproc_add(rproc);
 562         if (ret)
 563                 goto free_rproc;
 564
 565         return of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
 566
 567 free_rproc:
 568         rproc_free(rproc);
 569
 570         return ret;
 571 }
 572
 573 static int wcnss_remove(struct platform_device *pdev)
 574 {
 575         struct qcom_wcnss *wcnss = platform_get_drvdata(pdev);
 576
 577         of_platform_depopulate(&pdev->dev);
 578
 579         qcom_smem_state_put(wcnss->state);
 580         rproc_del(wcnss->rproc);
 581
 582         qcom_remove_sysmon_subdev(wcnss->sysmon);
 583         qcom_remove_smd_subdev(wcnss->rproc, &wcnss->smd_subdev);
 584         rproc_free(wcnss->rproc);
 585
 586         return 0;
 587 }
 588
 589 static const struct of_device_id wcnss_of_match[] = {
 590         { .compatible = "qcom,riva-pil", &riva_data },
 591         { .compatible = "qcom,pronto-v1-pil", &pronto_v1_data },
 592         { .compatible = "qcom,pronto-v2-pil", &pronto_v2_data },
 593         { },
 594 };
 595 MODULE_DEVICE_TABLE(of, wcnss_of_match);
 596
 597 static struct platform_driver wcnss_driver = {
 598         .probe = wcnss_probe,
 599         .remove = wcnss_remove,
 600         .driver = {
 601                 .name = "qcom-wcnss-pil",
 602                 .of_match_table = wcnss_of_match,
 603         },
 604 };
 605
 606 static int __init wcnss_init(void)
 607 {
 608         int ret;
 609
 610         ret = platform_driver_register(&wcnss_driver);
 611         if (ret)
 612                 return ret;
 613
 614         ret = platform_driver_register(&qcom_iris_driver);
 615         if (ret)
 616                 platform_driver_unregister(&wcnss_driver);
 617
 618         return ret;
 619 }
 620 module_init(wcnss_init);
 621
 622 static void __exit wcnss_exit(void)
 623 {
 624         platform_driver_unregister(&qcom_iris_driver);
 625         platform_driver_unregister(&wcnss_driver);
 626 }
 627 module_exit(wcnss_exit);
 628
 629 MODULE_DESCRIPTION("Qualcomm Peripheral Image Loader for Wireless Subsystem");
 630 MODULE_LICENSE("GPL v2");