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 88static const int iTCO_version = 3; 89 90static 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 115static 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 */ 135static DEFINE_MUTEX(ipclock); 136 137static 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 147static inline u32 ipc_read_status(void) 148{ 149 return readl(ipcdev.ipc_base + IPC_STATUS); 150} 151 152static inline void ipc_data_writel(u32 data, u32 offset) 153{ 154 writel(data, ipcdev.ipc_base + IPC_WRITE_BUFFER + offset); 155} 156 157static inline u8 ipc_data_readb(u32 offset) 158{ 159 return readb(ipcdev.ipc_base + IPC_READ_BUFFER + offset); 160} 161 162static inline u32 ipc_data_readl(u32 offset) 163{ 164 return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset); 165} 166 167static 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 */ 223int 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} 238EXPORT_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 */ 255int 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} 288EXPORT_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 */ 303int 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} 308EXPORT_SYMBOL_GPL(intel_pmc_ipc_command); 309 310static 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 323static 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 364static 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 373static const struct pci_device_id ipc_pci_ids[] = { 374 {PCI_VDEVICE(INTEL, 0x0a94), 0}, 375 {PCI_VDEVICE(INTEL, 0x1a94), 0}, 376 { 0,} 377}; 378MODULE_DEVICE_TABLE(pci, ipc_pci_ids); 379 380static 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 387static 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 409static 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 432static DEVICE_ATTR(simplecmd, S_IWUSR, 433 NULL, intel_pmc_ipc_simple_cmd_store); 434static DEVICE_ATTR(northpeak, S_IWUSR, 435 NULL, intel_pmc_ipc_northpeak_store); 436 437static struct attribute *intel_ipc_attrs[] = { 438 &dev_attr_northpeak.attr, 439 &dev_attr_simplecmd.attr, 440 NULL 441}; 442 443static const struct attribute_group intel_ipc_group = { 444 .attrs = intel_ipc_attrs, 445}; 446 447#define PUNIT_RESOURCE_INTER 1 448static 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 461static 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 476static struct itco_wdt_platform_data tco_info = { 477 .name = "Apollo Lake SoC", 478 .version = 3, 479}; 480 481static 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; 518err: 519 platform_device_put(pdev); 520 return ret; 521} 522 523static 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; 569err: 570 platform_device_put(pdev); 571 return ret; 572} 573 574static 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 591static 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 661static const struct acpi_device_id ipc_acpi_ids[] = { 662 { "INT34D2", 0}, 663 { } 664}; 665MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids); 666#endif 667 668static 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; 709err_sys: 710 free_irq(ipcdev.irq, &ipcdev); 711err_irq: 712 platform_device_unregister(ipcdev.tco_dev); 713 platform_device_unregister(ipcdev.punit_dev); 714err_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 723static 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 740static 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 749static 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 767static void __exit intel_pmc_ipc_exit(void) 768{ 769 pci_unregister_driver(&ipc_pci_driver); 770 platform_driver_unregister(&ipc_plat_driver); 771} 772 773MODULE_AUTHOR("Zha Qipeng <qipeng.zha@intel.com>"); 774MODULE_DESCRIPTION("Intel PMC IPC driver"); 775MODULE_LICENSE("GPL"); 776 777/* Some modules are dependent on this, so init earlier */ 778fs_initcall(intel_pmc_ipc_init); 779module_exit(intel_pmc_ipc_exit); 780