drivers/platform/x86/intel_pmc_ipc.c

   1 /*
   2  * intel_pmc_ipc.c: Driver for the Intel PMC IPC mechanism
   3  *
   4  * (C) Copyright 2014-2015 Intel Corporation
   5  *
   6  * This driver is based on Intel SCU IPC driver(intel_scu_opc.c) by
   7  *     Sreedhara DS <sreedhara.ds@intel.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; version 2
  12  * of the License.
  13  *
  14  * PMC running in ARC processor communicates with other entity running in IA
  15  * core through IPC mechanism which in turn messaging between IA core ad PMC.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/delay.h>
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/device.h>
  23 #include <linux/pm.h>
  24 #include <linux/pci.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/pm_qos.h>
  28 #include <linux/kernel.h>
  29 #include <linux/bitops.h>
  30 #include <linux/sched.h>
  31 #include <linux/atomic.h>
  32 #include <linux/notifier.h>
  33 #include <linux/suspend.h>
  34 #include <linux/acpi.h>
  35 #include <asm/intel_pmc_ipc.h>
  36 #include <linux/platform_data/itco_wdt.h>
  37
  38 /*
  39  * IPC registers
  40  * The IA write to IPC_CMD command register triggers an interrupt to the ARC,
  41  * The ARC handles the interrupt and services it, writing optional data to
  42  * the IPC1 registers, updates the IPC_STS response register with the status.
  43  */
  44 #define IPC_CMD                 0x0
  45 #define         IPC_CMD_MSI             0x100
  46 #define         IPC_CMD_SIZE            16
  47 #define         IPC_CMD_SUBCMD          12
  48 #define IPC_STATUS              0x04
  49 #define         IPC_STATUS_IRQ          0x4
  50 #define         IPC_STATUS_ERR          0x2
  51 #define         IPC_STATUS_BUSY         0x1
  52 #define IPC_SPTR                0x08
  53 #define IPC_DPTR                0x0C
  54 #define IPC_WRITE_BUFFER        0x80
  55 #define IPC_READ_BUFFER         0x90
  56
  57 /*
  58  * 16-byte buffer for sending data associated with IPC command.
  59  */
  60 #define IPC_DATA_BUFFER_SIZE    16
  61
  62 #define IPC_LOOP_CNT            3000000
  63 #define IPC_MAX_SEC             3
  64
  65 #define IPC_TRIGGER_MODE_IRQ            true
  66
  67 /* exported resources from IFWI */
  68 #define PLAT_RESOURCE_IPC_INDEX         0
  69 #define PLAT_RESOURCE_IPC_SIZE          0x1000
  70 #define PLAT_RESOURCE_GCR_SIZE          0x1000
  71 #define PLAT_RESOURCE_PUNIT_DATA_INDEX  1
  72 #define PLAT_RESOURCE_PUNIT_INTER_INDEX 2
  73 #define PLAT_RESOURCE_ACPI_IO_INDEX     0
  74
  75 /*
  76  * BIOS does not create an ACPI device for each PMC function,
  77  * but exports multiple resources from one ACPI device(IPC) for
  78  * multiple functions. This driver is responsible to create a
  79  * platform device and to export resources for those functions.
  80  */
  81 #define TCO_DEVICE_NAME                 "iTCO_wdt"
  82 #define SMI_EN_OFFSET                   0x30
  83 #define SMI_EN_SIZE                     4
  84 #define TCO_BASE_OFFSET                 0x60
  85 #define TCO_REGS_SIZE                   16
  86 #define PUNIT_DEVICE_NAME               "intel_punit_ipc"
  87
  88 static const int iTCO_version = 3;
  89
  90 static struct intel_pmc_ipc_dev {
  91         struct device *dev;
  92         void __iomem *ipc_base;
  93         bool irq_mode;
  94         int irq;
  95         int cmd;
  96         struct completion cmd_complete;
  97
  98         /* The following PMC BARs share the same ACPI device with the IPC */
  99         resource_size_t acpi_io_base;
 100         int acpi_io_size;
 101         struct platform_device *tco_dev;
 102
 103         /* gcr */
 104         resource_size_t gcr_base;
 105         int gcr_size;
 106
 107         /* punit */
 108         resource_size_t punit_base;
 109         int punit_size;
 110         resource_size_t punit_base2;
 111         int punit_size2;
 112         struct platform_device *punit_dev;
 113 } ipcdev;
 114
 115 static char *ipc_err_sources[] = {
 116         [IPC_ERR_NONE] =
 117                 "no error",
 118         [IPC_ERR_CMD_NOT_SUPPORTED] =
 119                 "command not supported",
 120         [IPC_ERR_CMD_NOT_SERVICED] =
 121                 "command not serviced",
 122         [IPC_ERR_UNABLE_TO_SERVICE] =
 123                 "unable to service",
 124         [IPC_ERR_CMD_INVALID] =
 125                 "command invalid",
 126         [IPC_ERR_CMD_FAILED] =
 127                 "command failed",
 128         [IPC_ERR_EMSECURITY] =
 129                 "Invalid Battery",
 130         [IPC_ERR_UNSIGNEDKERNEL] =
 131                 "Unsigned kernel",
 132 };
 133
 134 /* Prevent concurrent calls to the PMC */
 135 static DEFINE_MUTEX(ipclock);
 136
 137 static inline void ipc_send_command(u32 cmd)
 138 {
 139         ipcdev.cmd = cmd;
 140         if (ipcdev.irq_mode) {
 141                 reinit_completion(&ipcdev.cmd_complete);
 142                 cmd |= IPC_CMD_MSI;
 143         }
 144         writel(cmd, ipcdev.ipc_base + IPC_CMD);
 145 }
 146
 147 static inline u32 ipc_read_status(void)
 148 {
 149         return readl(ipcdev.ipc_base + IPC_STATUS);
 150 }
 151
 152 static inline void ipc_data_writel(u32 data, u32 offset)
 153 {
 154         writel(data, ipcdev.ipc_base + IPC_WRITE_BUFFER + offset);
 155 }
 156
 157 static inline u8 ipc_data_readb(u32 offset)
 158 {
 159         return readb(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
 160 }
 161
 162 static inline u32 ipc_data_readl(u32 offset)
 163 {
 164         return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
 165 }
 166
 167 static int intel_pmc_ipc_check_status(void)
 168 {
 169         int status;
 170         int ret = 0;
 171
 172         if (ipcdev.irq_mode) {
 173                 if (0 == wait_for_completion_timeout(
 174                                 &ipcdev.cmd_complete, IPC_MAX_SEC * HZ))
 175                         ret = -ETIMEDOUT;
 176         } else {
 177                 int loop_count = IPC_LOOP_CNT;
 178
 179                 while ((ipc_read_status() & IPC_STATUS_BUSY) && --loop_count)
 180                         udelay(1);
 181                 if (loop_count == 0)
 182                         ret = -ETIMEDOUT;
 183         }
 184
 185         status = ipc_read_status();
 186         if (ret == -ETIMEDOUT) {
 187                 dev_err(ipcdev.dev,
 188                         "IPC timed out, TS=0x%x, CMD=0x%x\n",
 189                         status, ipcdev.cmd);
 190                 return ret;
 191         }
 192
 193         if (status & IPC_STATUS_ERR) {
 194                 int i;
 195
 196                 ret = -EIO;
 197                 i = (status >> IPC_CMD_SIZE) & 0xFF;
 198                 if (i < ARRAY_SIZE(ipc_err_sources))
 199                         dev_err(ipcdev.dev,
 200                                 "IPC failed: %s, STS=0x%x, CMD=0x%x\n",
 201                                 ipc_err_sources[i], status, ipcdev.cmd);
 202                 else
 203                         dev_err(ipcdev.dev,
 204                                 "IPC failed: unknown, STS=0x%x, CMD=0x%x\n",
 205                                 status, ipcdev.cmd);
 206                 if ((i == IPC_ERR_UNSIGNEDKERNEL) || (i == IPC_ERR_EMSECURITY))
 207                         ret = -EACCES;
 208         }
 209
 210         return ret;
 211 }
 212
 213 /**
 214  * intel_pmc_ipc_simple_command() - Simple IPC command
 215  * @cmd:        IPC command code.
 216  * @sub:        IPC command sub type.
 217  *
 218  * Send a simple IPC command to PMC when don't need to specify
 219  * input/output data and source/dest pointers.
 220  *
 221  * Return:      an IPC error code or 0 on success.
 222  */
 223 int intel_pmc_ipc_simple_command(int cmd, int sub)
 224 {
 225         int ret;
 226
 227         mutex_lock(&ipclock);
 228         if (ipcdev.dev == NULL) {
 229                 mutex_unlock(&ipclock);
 230                 return -ENODEV;
 231         }
 232         ipc_send_command(sub << IPC_CMD_SUBCMD | cmd);
 233         ret = intel_pmc_ipc_check_status();
 234         mutex_unlock(&ipclock);
 235
 236         return ret;
 237 }
 238 EXPORT_SYMBOL_GPL(intel_pmc_ipc_simple_command);
 239
 240 /**
 241  * intel_pmc_ipc_raw_cmd() - IPC command with data and pointers
 242  * @cmd:        IPC command code.
 243  * @sub:        IPC command sub type.
 244  * @in:         input data of this IPC command.
 245  * @inlen:      input data length in bytes.
 246  * @out:        output data of this IPC command.
 247  * @outlen:     output data length in dwords.
 248  * @sptr:       data writing to SPTR register.
 249  * @dptr:       data writing to DPTR register.
 250  *
 251  * Send an IPC command to PMC with input/output data and source/dest pointers.
 252  *
 253  * Return:      an IPC error code or 0 on success.
 254  */
 255 int intel_pmc_ipc_raw_cmd(u32 cmd, u32 sub, u8 *in, u32 inlen, u32 *out,
 256                           u32 outlen, u32 dptr, u32 sptr)
 257 {
 258         u32 wbuf[4] = { 0 };
 259         int ret;
 260         int i;
 261
 262         if (inlen > IPC_DATA_BUFFER_SIZE || outlen > IPC_DATA_BUFFER_SIZE / 4)
 263                 return -EINVAL;
 264
 265         mutex_lock(&ipclock);
 266         if (ipcdev.dev == NULL) {
 267                 mutex_unlock(&ipclock);
 268                 return -ENODEV;
 269         }
 270         memcpy(wbuf, in, inlen);
 271         writel(dptr, ipcdev.ipc_base + IPC_DPTR);
 272         writel(sptr, ipcdev.ipc_base + IPC_SPTR);
 273         /* The input data register is 32bit register and inlen is in Byte */
 274         for (i = 0; i < ((inlen + 3) / 4); i++)
 275                 ipc_data_writel(wbuf[i], 4 * i);
 276         ipc_send_command((inlen << IPC_CMD_SIZE) |
 277                         (sub << IPC_CMD_SUBCMD) | cmd);
 278         ret = intel_pmc_ipc_check_status();
 279         if (!ret) {
 280                 /* out is read from 32bit register and outlen is in 32bit */
 281                 for (i = 0; i < outlen; i++)
 282                         *out++ = ipc_data_readl(4 * i);
 283         }
 284         mutex_unlock(&ipclock);
 285
 286         return ret;
 287 }
 288 EXPORT_SYMBOL_GPL(intel_pmc_ipc_raw_cmd);
 289
 290 /**
 291  * intel_pmc_ipc_command() -  IPC command with input/output data
 292  * @cmd:        IPC command code.
 293  * @sub:        IPC command sub type.
 294  * @in:         input data of this IPC command.
 295  * @inlen:      input data length in bytes.
 296  * @out:        output data of this IPC command.
 297  * @outlen:     output data length in dwords.
 298  *
 299  * Send an IPC command to PMC with input/output data.
 300  *
 301  * Return:      an IPC error code or 0 on success.
 302  */
 303 int intel_pmc_ipc_command(u32 cmd, u32 sub, u8 *in, u32 inlen,
 304                           u32 *out, u32 outlen)
 305 {
 306         return intel_pmc_ipc_raw_cmd(cmd, sub, in, inlen, out, outlen, 0, 0);
 307 }
 308 EXPORT_SYMBOL_GPL(intel_pmc_ipc_command);
 309
 310 static irqreturn_t ioc(int irq, void *dev_id)
 311 {
 312         int status;
 313
 314         if (ipcdev.irq_mode) {
 315                 status = ipc_read_status();
 316                 writel(status | IPC_STATUS_IRQ, ipcdev.ipc_base + IPC_STATUS);
 317         }
 318         complete(&ipcdev.cmd_complete);
 319
 320         return IRQ_HANDLED;
 321 }
 322
 323 static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 324 {
 325         resource_size_t pci_resource;
 326         int ret;
 327         int len;
 328
 329         ipcdev.dev = &pci_dev_get(pdev)->dev;
 330         ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
 331
 332         ret = pci_enable_device(pdev);
 333         if (ret)
 334                 return ret;
 335
 336         ret = pci_request_regions(pdev, "intel_pmc_ipc");
 337         if (ret)
 338                 return ret;
 339
 340         pci_resource = pci_resource_start(pdev, 0);
 341         len = pci_resource_len(pdev, 0);
 342         if (!pci_resource || !len) {
 343                 dev_err(&pdev->dev, "Failed to get resource\n");
 344                 return -ENOMEM;
 345         }
 346
 347         init_completion(&ipcdev.cmd_complete);
 348
 349         if (request_irq(pdev->irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
 350                 dev_err(&pdev->dev, "Failed to request irq\n");
 351                 return -EBUSY;
 352         }
 353
 354         ipcdev.ipc_base = ioremap_nocache(pci_resource, len);
 355         if (!ipcdev.ipc_base) {
 356                 dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
 357                 free_irq(pdev->irq, &ipcdev);
 358                 ret = -ENOMEM;
 359         }
 360
 361         return ret;
 362 }
 363
 364 static void ipc_pci_remove(struct pci_dev *pdev)
 365 {
 366         free_irq(pdev->irq, &ipcdev);
 367         pci_release_regions(pdev);
 368         pci_dev_put(pdev);
 369         iounmap(ipcdev.ipc_base);
 370         ipcdev.dev = NULL;
 371 }
 372
 373 static const struct pci_device_id ipc_pci_ids[] = {
 374         {PCI_VDEVICE(INTEL, 0x0a94), 0},
 375         {PCI_VDEVICE(INTEL, 0x1a94), 0},
 376         { 0,}
 377 };
 378 MODULE_DEVICE_TABLE(pci, ipc_pci_ids);
 379
 380 static struct pci_driver ipc_pci_driver = {
 381         .name = "intel_pmc_ipc",
 382         .id_table = ipc_pci_ids,
 383         .probe = ipc_pci_probe,
 384         .remove = ipc_pci_remove,
 385 };
 386
 387 static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
 388                                               struct device_attribute *attr,
 389                                               const char *buf, size_t count)
 390 {
 391         int subcmd;
 392         int cmd;
 393         int ret;
 394
 395         ret = sscanf(buf, "%d %d", &cmd, &subcmd);
 396         if (ret != 2) {
 397                 dev_err(dev, "Error args\n");
 398                 return -EINVAL;
 399         }
 400
 401         ret = intel_pmc_ipc_simple_command(cmd, subcmd);
 402         if (ret) {
 403                 dev_err(dev, "command %d error with %d\n", cmd, ret);
 404                 return ret;
 405         }
 406         return (ssize_t)count;
 407 }
 408
 409 static ssize_t intel_pmc_ipc_northpeak_store(struct device *dev,
 410                                              struct device_attribute *attr,
 411                                              const char *buf, size_t count)
 412 {
 413         unsigned long val;
 414         int subcmd;
 415         int ret;
 416
 417         if (kstrtoul(buf, 0, &val))
 418                 return -EINVAL;
 419
 420         if (val)
 421                 subcmd = 1;
 422         else
 423                 subcmd = 0;
 424         ret = intel_pmc_ipc_simple_command(PMC_IPC_NORTHPEAK_CTRL, subcmd);
 425         if (ret) {
 426                 dev_err(dev, "command north %d error with %d\n", subcmd, ret);
 427                 return ret;
 428         }
 429         return (ssize_t)count;
 430 }
 431
 432 static DEVICE_ATTR(simplecmd, S_IWUSR,
 433                    NULL, intel_pmc_ipc_simple_cmd_store);
 434 static DEVICE_ATTR(northpeak, S_IWUSR,
 435                    NULL, intel_pmc_ipc_northpeak_store);
 436
 437 static struct attribute *intel_ipc_attrs[] = {
 438         &dev_attr_northpeak.attr,
 439         &dev_attr_simplecmd.attr,
 440         NULL
 441 };
 442
 443 static const struct attribute_group intel_ipc_group = {
 444         .attrs = intel_ipc_attrs,
 445 };
 446
 447 #define PUNIT_RESOURCE_INTER            1
 448 static struct resource punit_res[] = {
 449         /* Punit */
 450         {
 451                 .flags = IORESOURCE_MEM,
 452         },
 453         {
 454                 .flags = IORESOURCE_MEM,
 455         },
 456 };
 457
 458 #define TCO_RESOURCE_ACPI_IO            0
 459 #define TCO_RESOURCE_SMI_EN_IO          1
 460 #define TCO_RESOURCE_GCR_MEM            2
 461 static struct resource tco_res[] = {
 462         /* ACPI - TCO */
 463         {
 464                 .flags = IORESOURCE_IO,
 465         },
 466         /* ACPI - SMI */
 467         {
 468                 .flags = IORESOURCE_IO,
 469         },
 470         /* GCS */
 471         {
 472                 .flags = IORESOURCE_MEM,
 473         },
 474 };
 475
 476 static struct itco_wdt_platform_data tco_info = {
 477         .name = "Apollo Lake SoC",
 478         .version = 3,
 479 };
 480
 481 static int ipc_create_punit_device(void)
 482 {
 483         struct platform_device *pdev;
 484         struct resource *res;
 485         int ret;
 486
 487         pdev = platform_device_alloc(PUNIT_DEVICE_NAME, -1);
 488         if (!pdev) {
 489                 dev_err(ipcdev.dev, "Failed to alloc punit platform device\n");
 490                 return -ENOMEM;
 491         }
 492
 493         pdev->dev.parent = ipcdev.dev;
 494
 495         res = punit_res;
 496         res->start = ipcdev.punit_base;
 497         res->end = res->start + ipcdev.punit_size - 1;
 498
 499         res = punit_res + PUNIT_RESOURCE_INTER;
 500         res->start = ipcdev.punit_base2;
 501         res->end = res->start + ipcdev.punit_size2 - 1;
 502
 503         ret = platform_device_add_resources(pdev, punit_res,
 504                                             ARRAY_SIZE(punit_res));
 505         if (ret) {
 506                 dev_err(ipcdev.dev, "Failed to add platform punit resources\n");
 507                 goto err;
 508         }
 509
 510         ret = platform_device_add(pdev);
 511         if (ret) {
 512                 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
 513                 goto err;
 514         }
 515         ipcdev.punit_dev = pdev;
 516
 517         return 0;
 518 err:
 519         platform_device_put(pdev);
 520         return ret;
 521 }
 522
 523 static int ipc_create_tco_device(void)
 524 {
 525         struct platform_device *pdev;
 526         struct resource *res;
 527         int ret;
 528
 529         pdev = platform_device_alloc(TCO_DEVICE_NAME, -1);
 530         if (!pdev) {
 531                 dev_err(ipcdev.dev, "Failed to alloc tco platform device\n");
 532                 return -ENOMEM;
 533         }
 534
 535         pdev->dev.parent = ipcdev.dev;
 536
 537         res = tco_res + TCO_RESOURCE_ACPI_IO;
 538         res->start = ipcdev.acpi_io_base + TCO_BASE_OFFSET;
 539         res->end = res->start + TCO_REGS_SIZE - 1;
 540
 541         res = tco_res + TCO_RESOURCE_SMI_EN_IO;
 542         res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
 543         res->end = res->start + SMI_EN_SIZE - 1;
 544
 545         res = tco_res + TCO_RESOURCE_GCR_MEM;
 546         res->start = ipcdev.gcr_base;
 547         res->end = res->start + ipcdev.gcr_size - 1;
 548
 549         ret = platform_device_add_resources(pdev, tco_res, ARRAY_SIZE(tco_res));
 550         if (ret) {
 551                 dev_err(ipcdev.dev, "Failed to add tco platform resources\n");
 552                 goto err;
 553         }
 554
 555         ret = platform_device_add_data(pdev, &tco_info, sizeof(tco_info));
 556         if (ret) {
 557                 dev_err(ipcdev.dev, "Failed to add tco platform data\n");
 558                 goto err;
 559         }
 560
 561         ret = platform_device_add(pdev);
 562         if (ret) {
 563                 dev_err(ipcdev.dev, "Failed to add tco platform device\n");
 564                 goto err;
 565         }
 566         ipcdev.tco_dev = pdev;
 567
 568         return 0;
 569 err:
 570         platform_device_put(pdev);
 571         return ret;
 572 }
 573
 574 static int ipc_create_pmc_devices(void)
 575 {
 576         int ret;
 577
 578         ret = ipc_create_tco_device();
 579         if (ret) {
 580                 dev_err(ipcdev.dev, "Failed to add tco platform device\n");
 581                 return ret;
 582         }
 583         ret = ipc_create_punit_device();
 584         if (ret) {
 585                 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
 586                 platform_device_unregister(ipcdev.tco_dev);
 587         }
 588         return ret;
 589 }
 590
 591 static int ipc_plat_get_res(struct platform_device *pdev)
 592 {
 593         struct resource *res;
 594         void __iomem *addr;
 595         int size;
 596
 597         res = platform_get_resource(pdev, IORESOURCE_IO,
 598                                     PLAT_RESOURCE_ACPI_IO_INDEX);
 599         if (!res) {
 600                 dev_err(&pdev->dev, "Failed to get io resource\n");
 601                 return -ENXIO;
 602         }
 603         size = resource_size(res);
 604         ipcdev.acpi_io_base = res->start;
 605         ipcdev.acpi_io_size = size;
 606         dev_info(&pdev->dev, "io res: %llx %x\n",
 607                  (long long)res->start, (int)resource_size(res));
 608
 609         res = platform_get_resource(pdev, IORESOURCE_MEM,
 610                                     PLAT_RESOURCE_PUNIT_DATA_INDEX);
 611         if (!res) {
 612                 dev_err(&pdev->dev, "Failed to get punit resource\n");
 613                 return -ENXIO;
 614         }
 615         size = resource_size(res);
 616         ipcdev.punit_base = res->start;
 617         ipcdev.punit_size = size;
 618         dev_info(&pdev->dev, "punit data res: %llx %x\n",
 619                  (long long)res->start, (int)resource_size(res));
 620
 621         res = platform_get_resource(pdev, IORESOURCE_MEM,
 622                                     PLAT_RESOURCE_PUNIT_INTER_INDEX);
 623         if (!res) {
 624                 dev_err(&pdev->dev, "Failed to get punit inter resource\n");
 625                 return -ENXIO;
 626         }
 627         size = resource_size(res);
 628         ipcdev.punit_base2 = res->start;
 629         ipcdev.punit_size2 = size;
 630         dev_info(&pdev->dev, "punit interface res: %llx %x\n",
 631                  (long long)res->start, (int)resource_size(res));
 632
 633         res = platform_get_resource(pdev, IORESOURCE_MEM,
 634                                     PLAT_RESOURCE_IPC_INDEX);
 635         if (!res) {
 636                 dev_err(&pdev->dev, "Failed to get ipc resource\n");
 637                 return -ENXIO;
 638         }
 639         size = PLAT_RESOURCE_IPC_SIZE;
 640         if (!request_mem_region(res->start, size, pdev->name)) {
 641                 dev_err(&pdev->dev, "Failed to request ipc resource\n");
 642                 return -EBUSY;
 643         }
 644         addr = ioremap_nocache(res->start, size);
 645         if (!addr) {
 646                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
 647                 release_mem_region(res->start, size);
 648                 return -ENOMEM;
 649         }
 650         ipcdev.ipc_base = addr;
 651
 652         ipcdev.gcr_base = res->start + size;
 653         ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
 654         dev_info(&pdev->dev, "ipc res: %llx %x\n",
 655                  (long long)res->start, (int)resource_size(res));
 656
 657         return 0;
 658 }
 659
 660 #ifdef CONFIG_ACPI
 661 static const struct acpi_device_id ipc_acpi_ids[] = {
 662         { "INT34D2", 0},
 663         { }
 664 };
 665 MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids);
 666 #endif
 667
 668 static int ipc_plat_probe(struct platform_device *pdev)
 669 {
 670         struct resource *res;
 671         int ret;
 672
 673         ipcdev.dev = &pdev->dev;
 674         ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
 675         init_completion(&ipcdev.cmd_complete);
 676
 677         ipcdev.irq = platform_get_irq(pdev, 0);
 678         if (ipcdev.irq < 0) {
 679                 dev_err(&pdev->dev, "Failed to get irq\n");
 680                 return -EINVAL;
 681         }
 682
 683         ret = ipc_plat_get_res(pdev);
 684         if (ret) {
 685                 dev_err(&pdev->dev, "Failed to request resource\n");
 686                 return ret;
 687         }
 688
 689         ret = ipc_create_pmc_devices();
 690         if (ret) {
 691                 dev_err(&pdev->dev, "Failed to create pmc devices\n");
 692                 goto err_device;
 693         }
 694
 695         if (request_irq(ipcdev.irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
 696                 dev_err(&pdev->dev, "Failed to request irq\n");
 697                 ret = -EBUSY;
 698                 goto err_irq;
 699         }
 700
 701         ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
 702         if (ret) {
 703                 dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
 704                         ret);
 705                 goto err_sys;
 706         }
 707
 708         return 0;
 709 err_sys:
 710         free_irq(ipcdev.irq, &ipcdev);
 711 err_irq:
 712         platform_device_unregister(ipcdev.tco_dev);
 713         platform_device_unregister(ipcdev.punit_dev);
 714 err_device:
 715         iounmap(ipcdev.ipc_base);
 716         res = platform_get_resource(pdev, IORESOURCE_MEM,
 717                                     PLAT_RESOURCE_IPC_INDEX);
 718         if (res)
 719                 release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
 720         return ret;
 721 }
 722
 723 static int ipc_plat_remove(struct platform_device *pdev)
 724 {
 725         struct resource *res;
 726
 727         sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
 728         free_irq(ipcdev.irq, &ipcdev);
 729         platform_device_unregister(ipcdev.tco_dev);
 730         platform_device_unregister(ipcdev.punit_dev);
 731         iounmap(ipcdev.ipc_base);
 732         res = platform_get_resource(pdev, IORESOURCE_MEM,
 733                                     PLAT_RESOURCE_IPC_INDEX);
 734         if (res)
 735                 release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
 736         ipcdev.dev = NULL;
 737         return 0;
 738 }
 739
 740 static struct platform_driver ipc_plat_driver = {
 741         .remove = ipc_plat_remove,
 742         .probe = ipc_plat_probe,
 743         .driver = {
 744                 .name = "pmc-ipc-plat",
 745                 .acpi_match_table = ACPI_PTR(ipc_acpi_ids),
 746         },
 747 };
 748
 749 static int __init intel_pmc_ipc_init(void)
 750 {
 751         int ret;
 752
 753         ret = platform_driver_register(&ipc_plat_driver);
 754         if (ret) {
 755                 pr_err("Failed to register PMC ipc platform driver\n");
 756                 return ret;
 757         }
 758         ret = pci_register_driver(&ipc_pci_driver);
 759         if (ret) {
 760                 pr_err("Failed to register PMC ipc pci driver\n");
 761                 platform_driver_unregister(&ipc_plat_driver);
 762                 return ret;
 763         }
 764         return ret;
 765 }
 766
 767 static void __exit intel_pmc_ipc_exit(void)
 768 {
 769         pci_unregister_driver(&ipc_pci_driver);
 770         platform_driver_unregister(&ipc_plat_driver);
 771 }
 772
 773 MODULE_AUTHOR("Zha Qipeng <qipeng.zha@intel.com>");
 774 MODULE_DESCRIPTION("Intel PMC IPC driver");
 775 MODULE_LICENSE("GPL");
 776
 777 /* Some modules are dependent on this, so init earlier */
 778 fs_initcall(intel_pmc_ipc_init);
 779 module_exit(intel_pmc_ipc_exit);