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_OFFSET        0x1008
  71 #define PLAT_RESOURCE_GCR_SIZE          0x4
  72 #define PLAT_RESOURCE_BIOS_DATA_INDEX   1
  73 #define PLAT_RESOURCE_BIOS_IFACE_INDEX  2
  74 #define PLAT_RESOURCE_TELEM_SSRAM_INDEX 3
  75 #define PLAT_RESOURCE_ISP_DATA_INDEX    4
  76 #define PLAT_RESOURCE_ISP_IFACE_INDEX   5
  77 #define PLAT_RESOURCE_GTD_DATA_INDEX    6
  78 #define PLAT_RESOURCE_GTD_IFACE_INDEX   7
  79 #define PLAT_RESOURCE_ACPI_IO_INDEX     0
  80
  81 /*
  82  * BIOS does not create an ACPI device for each PMC function,
  83  * but exports multiple resources from one ACPI device(IPC) for
  84  * multiple functions. This driver is responsible to create a
  85  * platform device and to export resources for those functions.
  86  */
  87 #define TCO_DEVICE_NAME                 "iTCO_wdt"
  88 #define SMI_EN_OFFSET                   0x30
  89 #define SMI_EN_SIZE                     4
  90 #define TCO_BASE_OFFSET                 0x60
  91 #define TCO_REGS_SIZE                   16
  92 #define PUNIT_DEVICE_NAME               "intel_punit_ipc"
  93 #define TELEMETRY_DEVICE_NAME           "intel_telemetry"
  94 #define TELEM_SSRAM_SIZE                240
  95 #define TELEM_PMC_SSRAM_OFFSET          0x1B00
  96 #define TELEM_PUNIT_SSRAM_OFFSET        0x1A00
  97
  98 static const int iTCO_version = 3;
  99
 100 static struct intel_pmc_ipc_dev {
 101         struct device *dev;
 102         void __iomem *ipc_base;
 103         bool irq_mode;
 104         int irq;
 105         int cmd;
 106         struct completion cmd_complete;
 107
 108         /* The following PMC BARs share the same ACPI device with the IPC */
 109         resource_size_t acpi_io_base;
 110         int acpi_io_size;
 111         struct platform_device *tco_dev;
 112
 113         /* gcr */
 114         resource_size_t gcr_base;
 115         int gcr_size;
 116
 117         /* punit */
 118         struct platform_device *punit_dev;
 119
 120         /* Telemetry */
 121         resource_size_t telem_pmc_ssram_base;
 122         resource_size_t telem_punit_ssram_base;
 123         int telem_pmc_ssram_size;
 124         int telem_punit_ssram_size;
 125         u8 telem_res_inval;
 126         struct platform_device *telemetry_dev;
 127 } ipcdev;
 128
 129 static char *ipc_err_sources[] = {
 130         [IPC_ERR_NONE] =
 131                 "no error",
 132         [IPC_ERR_CMD_NOT_SUPPORTED] =
 133                 "command not supported",
 134         [IPC_ERR_CMD_NOT_SERVICED] =
 135                 "command not serviced",
 136         [IPC_ERR_UNABLE_TO_SERVICE] =
 137                 "unable to service",
 138         [IPC_ERR_CMD_INVALID] =
 139                 "command invalid",
 140         [IPC_ERR_CMD_FAILED] =
 141                 "command failed",
 142         [IPC_ERR_EMSECURITY] =
 143                 "Invalid Battery",
 144         [IPC_ERR_UNSIGNEDKERNEL] =
 145                 "Unsigned kernel",
 146 };
 147
 148 /* Prevent concurrent calls to the PMC */
 149 static DEFINE_MUTEX(ipclock);
 150
 151 static inline void ipc_send_command(u32 cmd)
 152 {
 153         ipcdev.cmd = cmd;
 154         if (ipcdev.irq_mode) {
 155                 reinit_completion(&ipcdev.cmd_complete);
 156                 cmd |= IPC_CMD_MSI;
 157         }
 158         writel(cmd, ipcdev.ipc_base + IPC_CMD);
 159 }
 160
 161 static inline u32 ipc_read_status(void)
 162 {
 163         return readl(ipcdev.ipc_base + IPC_STATUS);
 164 }
 165
 166 static inline void ipc_data_writel(u32 data, u32 offset)
 167 {
 168         writel(data, ipcdev.ipc_base + IPC_WRITE_BUFFER + offset);
 169 }
 170
 171 static inline u8 ipc_data_readb(u32 offset)
 172 {
 173         return readb(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
 174 }
 175
 176 static inline u32 ipc_data_readl(u32 offset)
 177 {
 178         return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
 179 }
 180
 181 static int intel_pmc_ipc_check_status(void)
 182 {
 183         int status;
 184         int ret = 0;
 185
 186         if (ipcdev.irq_mode) {
 187                 if (0 == wait_for_completion_timeout(
 188                                 &ipcdev.cmd_complete, IPC_MAX_SEC * HZ))
 189                         ret = -ETIMEDOUT;
 190         } else {
 191                 int loop_count = IPC_LOOP_CNT;
 192
 193                 while ((ipc_read_status() & IPC_STATUS_BUSY) && --loop_count)
 194                         udelay(1);
 195                 if (loop_count == 0)
 196                         ret = -ETIMEDOUT;
 197         }
 198
 199         status = ipc_read_status();
 200         if (ret == -ETIMEDOUT) {
 201                 dev_err(ipcdev.dev,
 202                         "IPC timed out, TS=0x%x, CMD=0x%x\n",
 203                         status, ipcdev.cmd);
 204                 return ret;
 205         }
 206
 207         if (status & IPC_STATUS_ERR) {
 208                 int i;
 209
 210                 ret = -EIO;
 211                 i = (status >> IPC_CMD_SIZE) & 0xFF;
 212                 if (i < ARRAY_SIZE(ipc_err_sources))
 213                         dev_err(ipcdev.dev,
 214                                 "IPC failed: %s, STS=0x%x, CMD=0x%x\n",
 215                                 ipc_err_sources[i], status, ipcdev.cmd);
 216                 else
 217                         dev_err(ipcdev.dev,
 218                                 "IPC failed: unknown, STS=0x%x, CMD=0x%x\n",
 219                                 status, ipcdev.cmd);
 220                 if ((i == IPC_ERR_UNSIGNEDKERNEL) || (i == IPC_ERR_EMSECURITY))
 221                         ret = -EACCES;
 222         }
 223
 224         return ret;
 225 }
 226
 227 /**
 228  * intel_pmc_ipc_simple_command() - Simple IPC command
 229  * @cmd:        IPC command code.
 230  * @sub:        IPC command sub type.
 231  *
 232  * Send a simple IPC command to PMC when don't need to specify
 233  * input/output data and source/dest pointers.
 234  *
 235  * Return:      an IPC error code or 0 on success.
 236  */
 237 int intel_pmc_ipc_simple_command(int cmd, int sub)
 238 {
 239         int ret;
 240
 241         mutex_lock(&ipclock);
 242         if (ipcdev.dev == NULL) {
 243                 mutex_unlock(&ipclock);
 244                 return -ENODEV;
 245         }
 246         ipc_send_command(sub << IPC_CMD_SUBCMD | cmd);
 247         ret = intel_pmc_ipc_check_status();
 248         mutex_unlock(&ipclock);
 249
 250         return ret;
 251 }
 252 EXPORT_SYMBOL_GPL(intel_pmc_ipc_simple_command);
 253
 254 /**
 255  * intel_pmc_ipc_raw_cmd() - IPC command with data and pointers
 256  * @cmd:        IPC command code.
 257  * @sub:        IPC command sub type.
 258  * @in:         input data of this IPC command.
 259  * @inlen:      input data length in bytes.
 260  * @out:        output data of this IPC command.
 261  * @outlen:     output data length in dwords.
 262  * @sptr:       data writing to SPTR register.
 263  * @dptr:       data writing to DPTR register.
 264  *
 265  * Send an IPC command to PMC with input/output data and source/dest pointers.
 266  *
 267  * Return:      an IPC error code or 0 on success.
 268  */
 269 int intel_pmc_ipc_raw_cmd(u32 cmd, u32 sub, u8 *in, u32 inlen, u32 *out,
 270                           u32 outlen, u32 dptr, u32 sptr)
 271 {
 272         u32 wbuf[4] = { 0 };
 273         int ret;
 274         int i;
 275
 276         if (inlen > IPC_DATA_BUFFER_SIZE || outlen > IPC_DATA_BUFFER_SIZE / 4)
 277                 return -EINVAL;
 278
 279         mutex_lock(&ipclock);
 280         if (ipcdev.dev == NULL) {
 281                 mutex_unlock(&ipclock);
 282                 return -ENODEV;
 283         }
 284         memcpy(wbuf, in, inlen);
 285         writel(dptr, ipcdev.ipc_base + IPC_DPTR);
 286         writel(sptr, ipcdev.ipc_base + IPC_SPTR);
 287         /* The input data register is 32bit register and inlen is in Byte */
 288         for (i = 0; i < ((inlen + 3) / 4); i++)
 289                 ipc_data_writel(wbuf[i], 4 * i);
 290         ipc_send_command((inlen << IPC_CMD_SIZE) |
 291                         (sub << IPC_CMD_SUBCMD) | cmd);
 292         ret = intel_pmc_ipc_check_status();
 293         if (!ret) {
 294                 /* out is read from 32bit register and outlen is in 32bit */
 295                 for (i = 0; i < outlen; i++)
 296                         *out++ = ipc_data_readl(4 * i);
 297         }
 298         mutex_unlock(&ipclock);
 299
 300         return ret;
 301 }
 302 EXPORT_SYMBOL_GPL(intel_pmc_ipc_raw_cmd);
 303
 304 /**
 305  * intel_pmc_ipc_command() -  IPC command with input/output data
 306  * @cmd:        IPC command code.
 307  * @sub:        IPC command sub type.
 308  * @in:         input data of this IPC command.
 309  * @inlen:      input data length in bytes.
 310  * @out:        output data of this IPC command.
 311  * @outlen:     output data length in dwords.
 312  *
 313  * Send an IPC command to PMC with input/output data.
 314  *
 315  * Return:      an IPC error code or 0 on success.
 316  */
 317 int intel_pmc_ipc_command(u32 cmd, u32 sub, u8 *in, u32 inlen,
 318                           u32 *out, u32 outlen)
 319 {
 320         return intel_pmc_ipc_raw_cmd(cmd, sub, in, inlen, out, outlen, 0, 0);
 321 }
 322 EXPORT_SYMBOL_GPL(intel_pmc_ipc_command);
 323
 324 static irqreturn_t ioc(int irq, void *dev_id)
 325 {
 326         int status;
 327
 328         if (ipcdev.irq_mode) {
 329                 status = ipc_read_status();
 330                 writel(status | IPC_STATUS_IRQ, ipcdev.ipc_base + IPC_STATUS);
 331         }
 332         complete(&ipcdev.cmd_complete);
 333
 334         return IRQ_HANDLED;
 335 }
 336
 337 static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 338 {
 339         resource_size_t pci_resource;
 340         int ret;
 341         int len;
 342
 343         ipcdev.dev = &pci_dev_get(pdev)->dev;
 344         ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
 345
 346         ret = pci_enable_device(pdev);
 347         if (ret)
 348                 return ret;
 349
 350         ret = pci_request_regions(pdev, "intel_pmc_ipc");
 351         if (ret)
 352                 return ret;
 353
 354         pci_resource = pci_resource_start(pdev, 0);
 355         len = pci_resource_len(pdev, 0);
 356         if (!pci_resource || !len) {
 357                 dev_err(&pdev->dev, "Failed to get resource\n");
 358                 return -ENOMEM;
 359         }
 360
 361         init_completion(&ipcdev.cmd_complete);
 362
 363         if (request_irq(pdev->irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
 364                 dev_err(&pdev->dev, "Failed to request irq\n");
 365                 return -EBUSY;
 366         }
 367
 368         ipcdev.ipc_base = ioremap_nocache(pci_resource, len);
 369         if (!ipcdev.ipc_base) {
 370                 dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
 371                 free_irq(pdev->irq, &ipcdev);
 372                 ret = -ENOMEM;
 373         }
 374
 375         return ret;
 376 }
 377
 378 static void ipc_pci_remove(struct pci_dev *pdev)
 379 {
 380         free_irq(pdev->irq, &ipcdev);
 381         pci_release_regions(pdev);
 382         pci_dev_put(pdev);
 383         iounmap(ipcdev.ipc_base);
 384         ipcdev.dev = NULL;
 385 }
 386
 387 static const struct pci_device_id ipc_pci_ids[] = {
 388         {PCI_VDEVICE(INTEL, 0x0a94), 0},
 389         {PCI_VDEVICE(INTEL, 0x1a94), 0},
 390         { 0,}
 391 };
 392 MODULE_DEVICE_TABLE(pci, ipc_pci_ids);
 393
 394 static struct pci_driver ipc_pci_driver = {
 395         .name = "intel_pmc_ipc",
 396         .id_table = ipc_pci_ids,
 397         .probe = ipc_pci_probe,
 398         .remove = ipc_pci_remove,
 399 };
 400
 401 static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
 402                                               struct device_attribute *attr,
 403                                               const char *buf, size_t count)
 404 {
 405         int subcmd;
 406         int cmd;
 407         int ret;
 408
 409         ret = sscanf(buf, "%d %d", &cmd, &subcmd);
 410         if (ret != 2) {
 411                 dev_err(dev, "Error args\n");
 412                 return -EINVAL;
 413         }
 414
 415         ret = intel_pmc_ipc_simple_command(cmd, subcmd);
 416         if (ret) {
 417                 dev_err(dev, "command %d error with %d\n", cmd, ret);
 418                 return ret;
 419         }
 420         return (ssize_t)count;
 421 }
 422
 423 static ssize_t intel_pmc_ipc_northpeak_store(struct device *dev,
 424                                              struct device_attribute *attr,
 425                                              const char *buf, size_t count)
 426 {
 427         unsigned long val;
 428         int subcmd;
 429         int ret;
 430
 431         if (kstrtoul(buf, 0, &val))
 432                 return -EINVAL;
 433
 434         if (val)
 435                 subcmd = 1;
 436         else
 437                 subcmd = 0;
 438         ret = intel_pmc_ipc_simple_command(PMC_IPC_NORTHPEAK_CTRL, subcmd);
 439         if (ret) {
 440                 dev_err(dev, "command north %d error with %d\n", subcmd, ret);
 441                 return ret;
 442         }
 443         return (ssize_t)count;
 444 }
 445
 446 static DEVICE_ATTR(simplecmd, S_IWUSR,
 447                    NULL, intel_pmc_ipc_simple_cmd_store);
 448 static DEVICE_ATTR(northpeak, S_IWUSR,
 449                    NULL, intel_pmc_ipc_northpeak_store);
 450
 451 static struct attribute *intel_ipc_attrs[] = {
 452         &dev_attr_northpeak.attr,
 453         &dev_attr_simplecmd.attr,
 454         NULL
 455 };
 456
 457 static const struct attribute_group intel_ipc_group = {
 458         .attrs = intel_ipc_attrs,
 459 };
 460
 461 static struct resource punit_res_array[] = {
 462         /* Punit BIOS */
 463         {
 464                 .flags = IORESOURCE_MEM,
 465         },
 466         {
 467                 .flags = IORESOURCE_MEM,
 468         },
 469         /* Punit ISP */
 470         {
 471                 .flags = IORESOURCE_MEM,
 472         },
 473         {
 474                 .flags = IORESOURCE_MEM,
 475         },
 476         /* Punit GTD */
 477         {
 478                 .flags = IORESOURCE_MEM,
 479         },
 480         {
 481                 .flags = IORESOURCE_MEM,
 482         },
 483 };
 484
 485 #define TCO_RESOURCE_ACPI_IO            0
 486 #define TCO_RESOURCE_SMI_EN_IO          1
 487 #define TCO_RESOURCE_GCR_MEM            2
 488 static struct resource tco_res[] = {
 489         /* ACPI - TCO */
 490         {
 491                 .flags = IORESOURCE_IO,
 492         },
 493         /* ACPI - SMI */
 494         {
 495                 .flags = IORESOURCE_IO,
 496         },
 497         /* GCS */
 498         {
 499                 .flags = IORESOURCE_MEM,
 500         },
 501 };
 502
 503 static struct itco_wdt_platform_data tco_info = {
 504         .name = "Apollo Lake SoC",
 505         .version = 3,
 506 };
 507
 508 #define TELEMETRY_RESOURCE_PUNIT_SSRAM  0
 509 #define TELEMETRY_RESOURCE_PMC_SSRAM    1
 510 static struct resource telemetry_res[] = {
 511         /*Telemetry*/
 512         {
 513                 .flags = IORESOURCE_MEM,
 514         },
 515         {
 516                 .flags = IORESOURCE_MEM,
 517         },
 518 };
 519
 520 static int ipc_create_punit_device(void)
 521 {
 522         struct platform_device *pdev;
 523         int ret;
 524
 525         pdev = platform_device_alloc(PUNIT_DEVICE_NAME, -1);
 526         if (!pdev) {
 527                 dev_err(ipcdev.dev, "Failed to alloc punit platform device\n");
 528                 return -ENOMEM;
 529         }
 530
 531         pdev->dev.parent = ipcdev.dev;
 532         ret = platform_device_add_resources(pdev, punit_res_array,
 533                                             ARRAY_SIZE(punit_res_array));
 534         if (ret) {
 535                 dev_err(ipcdev.dev, "Failed to add platform punit resources\n");
 536                 goto err;
 537         }
 538
 539         ret = platform_device_add(pdev);
 540         if (ret) {
 541                 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
 542                 goto err;
 543         }
 544         ipcdev.punit_dev = pdev;
 545
 546         return 0;
 547 err:
 548         platform_device_put(pdev);
 549         return ret;
 550 }
 551
 552 static int ipc_create_tco_device(void)
 553 {
 554         struct platform_device *pdev;
 555         struct resource *res;
 556         int ret;
 557
 558         pdev = platform_device_alloc(TCO_DEVICE_NAME, -1);
 559         if (!pdev) {
 560                 dev_err(ipcdev.dev, "Failed to alloc tco platform device\n");
 561                 return -ENOMEM;
 562         }
 563
 564         pdev->dev.parent = ipcdev.dev;
 565
 566         res = tco_res + TCO_RESOURCE_ACPI_IO;
 567         res->start = ipcdev.acpi_io_base + TCO_BASE_OFFSET;
 568         res->end = res->start + TCO_REGS_SIZE - 1;
 569
 570         res = tco_res + TCO_RESOURCE_SMI_EN_IO;
 571         res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
 572         res->end = res->start + SMI_EN_SIZE - 1;
 573
 574         res = tco_res + TCO_RESOURCE_GCR_MEM;
 575         res->start = ipcdev.gcr_base;
 576         res->end = res->start + ipcdev.gcr_size - 1;
 577
 578         ret = platform_device_add_resources(pdev, tco_res, ARRAY_SIZE(tco_res));
 579         if (ret) {
 580                 dev_err(ipcdev.dev, "Failed to add tco platform resources\n");
 581                 goto err;
 582         }
 583
 584         ret = platform_device_add_data(pdev, &tco_info, sizeof(tco_info));
 585         if (ret) {
 586                 dev_err(ipcdev.dev, "Failed to add tco platform data\n");
 587                 goto err;
 588         }
 589
 590         ret = platform_device_add(pdev);
 591         if (ret) {
 592                 dev_err(ipcdev.dev, "Failed to add tco platform device\n");
 593                 goto err;
 594         }
 595         ipcdev.tco_dev = pdev;
 596
 597         return 0;
 598 err:
 599         platform_device_put(pdev);
 600         return ret;
 601 }
 602
 603 static int ipc_create_telemetry_device(void)
 604 {
 605         struct platform_device *pdev;
 606         struct resource *res;
 607         int ret;
 608
 609         pdev = platform_device_alloc(TELEMETRY_DEVICE_NAME, -1);
 610         if (!pdev) {
 611                 dev_err(ipcdev.dev,
 612                         "Failed to allocate telemetry platform device\n");
 613                 return -ENOMEM;
 614         }
 615
 616         pdev->dev.parent = ipcdev.dev;
 617
 618         res = telemetry_res + TELEMETRY_RESOURCE_PUNIT_SSRAM;
 619         res->start = ipcdev.telem_punit_ssram_base;
 620         res->end = res->start + ipcdev.telem_punit_ssram_size - 1;
 621
 622         res = telemetry_res + TELEMETRY_RESOURCE_PMC_SSRAM;
 623         res->start = ipcdev.telem_pmc_ssram_base;
 624         res->end = res->start + ipcdev.telem_pmc_ssram_size - 1;
 625
 626         ret = platform_device_add_resources(pdev, telemetry_res,
 627                                             ARRAY_SIZE(telemetry_res));
 628         if (ret) {
 629                 dev_err(ipcdev.dev,
 630                         "Failed to add telemetry platform resources\n");
 631                 goto err;
 632         }
 633
 634         ret = platform_device_add(pdev);
 635         if (ret) {
 636                 dev_err(ipcdev.dev,
 637                         "Failed to add telemetry platform device\n");
 638                 goto err;
 639         }
 640         ipcdev.telemetry_dev = pdev;
 641
 642         return 0;
 643 err:
 644         platform_device_put(pdev);
 645         return ret;
 646 }
 647
 648 static int ipc_create_pmc_devices(void)
 649 {
 650         int ret;
 651
 652         ret = ipc_create_tco_device();
 653         if (ret) {
 654                 dev_err(ipcdev.dev, "Failed to add tco platform device\n");
 655                 return ret;
 656         }
 657         ret = ipc_create_punit_device();
 658         if (ret) {
 659                 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
 660                 platform_device_unregister(ipcdev.tco_dev);
 661         }
 662
 663         if (!ipcdev.telem_res_inval) {
 664                 ret = ipc_create_telemetry_device();
 665                 if (ret)
 666                         dev_warn(ipcdev.dev,
 667                                 "Failed to add telemetry platform device\n");
 668         }
 669
 670         return ret;
 671 }
 672
 673 static int ipc_plat_get_res(struct platform_device *pdev)
 674 {
 675         struct resource *res, *punit_res;
 676         void __iomem *addr;
 677         int size;
 678
 679         res = platform_get_resource(pdev, IORESOURCE_IO,
 680                                     PLAT_RESOURCE_ACPI_IO_INDEX);
 681         if (!res) {
 682                 dev_err(&pdev->dev, "Failed to get io resource\n");
 683                 return -ENXIO;
 684         }
 685         size = resource_size(res);
 686         ipcdev.acpi_io_base = res->start;
 687         ipcdev.acpi_io_size = size;
 688         dev_info(&pdev->dev, "io res: %pR\n", res);
 689
 690         punit_res = punit_res_array;
 691         /* This is index 0 to cover BIOS data register */
 692         res = platform_get_resource(pdev, IORESOURCE_MEM,
 693                                     PLAT_RESOURCE_BIOS_DATA_INDEX);
 694         if (!res) {
 695                 dev_err(&pdev->dev, "Failed to get res of punit BIOS data\n");
 696                 return -ENXIO;
 697         }
 698         *punit_res = *res;
 699         dev_info(&pdev->dev, "punit BIOS data res: %pR\n", res);
 700
 701         /* This is index 1 to cover BIOS interface register */
 702         res = platform_get_resource(pdev, IORESOURCE_MEM,
 703                                     PLAT_RESOURCE_BIOS_IFACE_INDEX);
 704         if (!res) {
 705                 dev_err(&pdev->dev, "Failed to get res of punit BIOS iface\n");
 706                 return -ENXIO;
 707         }
 708         *++punit_res = *res;
 709         dev_info(&pdev->dev, "punit BIOS interface res: %pR\n", res);
 710
 711         /* This is index 2 to cover ISP data register, optional */
 712         res = platform_get_resource(pdev, IORESOURCE_MEM,
 713                                     PLAT_RESOURCE_ISP_DATA_INDEX);
 714         ++punit_res;
 715         if (res) {
 716                 *punit_res = *res;
 717                 dev_info(&pdev->dev, "punit ISP data res: %pR\n", res);
 718         }
 719
 720         /* This is index 3 to cover ISP interface register, optional */
 721         res = platform_get_resource(pdev, IORESOURCE_MEM,
 722                                     PLAT_RESOURCE_ISP_IFACE_INDEX);
 723         ++punit_res;
 724         if (res) {
 725                 *punit_res = *res;
 726                 dev_info(&pdev->dev, "punit ISP interface res: %pR\n", res);
 727         }
 728
 729         /* This is index 4 to cover GTD data register, optional */
 730         res = platform_get_resource(pdev, IORESOURCE_MEM,
 731                                     PLAT_RESOURCE_GTD_DATA_INDEX);
 732         ++punit_res;
 733         if (res) {
 734                 *punit_res = *res;
 735                 dev_info(&pdev->dev, "punit GTD data res: %pR\n", res);
 736         }
 737
 738         /* This is index 5 to cover GTD interface register, optional */
 739         res = platform_get_resource(pdev, IORESOURCE_MEM,
 740                                     PLAT_RESOURCE_GTD_IFACE_INDEX);
 741         ++punit_res;
 742         if (res) {
 743                 *punit_res = *res;
 744                 dev_info(&pdev->dev, "punit GTD interface res: %pR\n", res);
 745         }
 746
 747         res = platform_get_resource(pdev, IORESOURCE_MEM,
 748                                     PLAT_RESOURCE_IPC_INDEX);
 749         if (!res) {
 750                 dev_err(&pdev->dev, "Failed to get ipc resource\n");
 751                 return -ENXIO;
 752         }
 753         size = PLAT_RESOURCE_IPC_SIZE;
 754         if (!request_mem_region(res->start, size, pdev->name)) {
 755                 dev_err(&pdev->dev, "Failed to request ipc resource\n");
 756                 return -EBUSY;
 757         }
 758         addr = ioremap_nocache(res->start, size);
 759         if (!addr) {
 760                 dev_err(&pdev->dev, "I/O memory remapping failed\n");
 761                 release_mem_region(res->start, size);
 762                 return -ENOMEM;
 763         }
 764         ipcdev.ipc_base = addr;
 765
 766         ipcdev.gcr_base = res->start + PLAT_RESOURCE_GCR_OFFSET;
 767         ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
 768         dev_info(&pdev->dev, "ipc res: %pR\n", res);
 769
 770         ipcdev.telem_res_inval = 0;
 771         res = platform_get_resource(pdev, IORESOURCE_MEM,
 772                                     PLAT_RESOURCE_TELEM_SSRAM_INDEX);
 773         if (!res) {
 774                 dev_err(&pdev->dev, "Failed to get telemetry ssram resource\n");
 775                 ipcdev.telem_res_inval = 1;
 776         } else {
 777                 ipcdev.telem_punit_ssram_base = res->start +
 778                                                 TELEM_PUNIT_SSRAM_OFFSET;
 779                 ipcdev.telem_punit_ssram_size = TELEM_SSRAM_SIZE;
 780                 ipcdev.telem_pmc_ssram_base = res->start +
 781                                                 TELEM_PMC_SSRAM_OFFSET;
 782                 ipcdev.telem_pmc_ssram_size = TELEM_SSRAM_SIZE;
 783                 dev_info(&pdev->dev, "telemetry ssram res: %pR\n", res);
 784         }
 785
 786         return 0;
 787 }
 788
 789 #ifdef CONFIG_ACPI
 790 static const struct acpi_device_id ipc_acpi_ids[] = {
 791         { "INT34D2", 0},
 792         { }
 793 };
 794 MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids);
 795 #endif
 796
 797 static int ipc_plat_probe(struct platform_device *pdev)
 798 {
 799         struct resource *res;
 800         int ret;
 801
 802         ipcdev.dev = &pdev->dev;
 803         ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
 804         init_completion(&ipcdev.cmd_complete);
 805
 806         ipcdev.irq = platform_get_irq(pdev, 0);
 807         if (ipcdev.irq < 0) {
 808                 dev_err(&pdev->dev, "Failed to get irq\n");
 809                 return -EINVAL;
 810         }
 811
 812         ret = ipc_plat_get_res(pdev);
 813         if (ret) {
 814                 dev_err(&pdev->dev, "Failed to request resource\n");
 815                 return ret;
 816         }
 817
 818         ret = ipc_create_pmc_devices();
 819         if (ret) {
 820                 dev_err(&pdev->dev, "Failed to create pmc devices\n");
 821                 goto err_device;
 822         }
 823
 824         if (request_irq(ipcdev.irq, ioc, IRQF_NO_SUSPEND,
 825                         "intel_pmc_ipc", &ipcdev)) {
 826                 dev_err(&pdev->dev, "Failed to request irq\n");
 827                 ret = -EBUSY;
 828                 goto err_irq;
 829         }
 830
 831         ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
 832         if (ret) {
 833                 dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
 834                         ret);
 835                 goto err_sys;
 836         }
 837
 838         return 0;
 839 err_sys:
 840         free_irq(ipcdev.irq, &ipcdev);
 841 err_irq:
 842         platform_device_unregister(ipcdev.tco_dev);
 843         platform_device_unregister(ipcdev.punit_dev);
 844         platform_device_unregister(ipcdev.telemetry_dev);
 845 err_device:
 846         iounmap(ipcdev.ipc_base);
 847         res = platform_get_resource(pdev, IORESOURCE_MEM,
 848                                     PLAT_RESOURCE_IPC_INDEX);
 849         if (res)
 850                 release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
 851         return ret;
 852 }
 853
 854 static int ipc_plat_remove(struct platform_device *pdev)
 855 {
 856         struct resource *res;
 857
 858         sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
 859         free_irq(ipcdev.irq, &ipcdev);
 860         platform_device_unregister(ipcdev.tco_dev);
 861         platform_device_unregister(ipcdev.punit_dev);
 862         platform_device_unregister(ipcdev.telemetry_dev);
 863         iounmap(ipcdev.ipc_base);
 864         res = platform_get_resource(pdev, IORESOURCE_MEM,
 865                                     PLAT_RESOURCE_IPC_INDEX);
 866         if (res)
 867                 release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
 868         ipcdev.dev = NULL;
 869         return 0;
 870 }
 871
 872 static struct platform_driver ipc_plat_driver = {
 873         .remove = ipc_plat_remove,
 874         .probe = ipc_plat_probe,
 875         .driver = {
 876                 .name = "pmc-ipc-plat",
 877                 .acpi_match_table = ACPI_PTR(ipc_acpi_ids),
 878         },
 879 };
 880
 881 static int __init intel_pmc_ipc_init(void)
 882 {
 883         int ret;
 884
 885         ret = platform_driver_register(&ipc_plat_driver);
 886         if (ret) {
 887                 pr_err("Failed to register PMC ipc platform driver\n");
 888                 return ret;
 889         }
 890         ret = pci_register_driver(&ipc_pci_driver);
 891         if (ret) {
 892                 pr_err("Failed to register PMC ipc pci driver\n");
 893                 platform_driver_unregister(&ipc_plat_driver);
 894                 return ret;
 895         }
 896         return ret;
 897 }
 898
 899 static void __exit intel_pmc_ipc_exit(void)
 900 {
 901         pci_unregister_driver(&ipc_pci_driver);
 902         platform_driver_unregister(&ipc_plat_driver);
 903 }
 904
 905 MODULE_AUTHOR("Zha Qipeng <qipeng.zha@intel.com>");
 906 MODULE_DESCRIPTION("Intel PMC IPC driver");
 907 MODULE_LICENSE("GPL");
 908
 909 /* Some modules are dependent on this, so init earlier */
 910 fs_initcall(intel_pmc_ipc_init);
 911 module_exit(intel_pmc_ipc_exit);