2 * intel_pmc_ipc.c: Driver for the Intel PMC IPC mechanism
4 * (C) Copyright 2014-2015 Intel Corporation
6 * This driver is based on Intel SCU IPC driver(intel_scu_opc.c) by
7 * Sreedhara DS <sreedhara.ds@intel.com>
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
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.
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>
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>
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.
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
54 #define IPC_WRITE_BUFFER 0x80
55 #define IPC_READ_BUFFER 0x90
58 * 16-byte buffer for sending data associated with IPC command.
60 #define IPC_DATA_BUFFER_SIZE 16
62 #define IPC_LOOP_CNT 3000000
65 #define IPC_TRIGGER_MODE_IRQ true
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_BIOS_DATA_INDEX 1
72 #define PLAT_RESOURCE_BIOS_IFACE_INDEX 2
73 #define PLAT_RESOURCE_TELEM_SSRAM_INDEX 3
74 #define PLAT_RESOURCE_ISP_DATA_INDEX 4
75 #define PLAT_RESOURCE_ISP_IFACE_INDEX 5
76 #define PLAT_RESOURCE_GTD_DATA_INDEX 6
77 #define PLAT_RESOURCE_GTD_IFACE_INDEX 7
78 #define PLAT_RESOURCE_ACPI_IO_INDEX 0
81 * BIOS does not create an ACPI device for each PMC function,
82 * but exports multiple resources from one ACPI device(IPC) for
83 * multiple functions. This driver is responsible to create a
84 * platform device and to export resources for those functions.
86 #define TCO_DEVICE_NAME "iTCO_wdt"
87 #define SMI_EN_OFFSET 0x30
89 #define TCO_BASE_OFFSET 0x60
90 #define TCO_REGS_SIZE 16
91 #define PUNIT_DEVICE_NAME "intel_punit_ipc"
92 #define TELEMETRY_DEVICE_NAME "intel_telemetry"
93 #define TELEM_SSRAM_SIZE 240
94 #define TELEM_PMC_SSRAM_OFFSET 0x1B00
95 #define TELEM_PUNIT_SSRAM_OFFSET 0x1A00
97 static const int iTCO_version = 3;
99 static struct intel_pmc_ipc_dev {
101 void __iomem *ipc_base;
105 struct completion cmd_complete;
107 /* The following PMC BARs share the same ACPI device with the IPC */
108 resource_size_t acpi_io_base;
110 struct platform_device *tco_dev;
113 resource_size_t gcr_base;
117 struct platform_device *punit_dev;
120 resource_size_t telem_pmc_ssram_base;
121 resource_size_t telem_punit_ssram_base;
122 int telem_pmc_ssram_size;
123 int telem_punit_ssram_size;
125 struct platform_device *telemetry_dev;
128 static char *ipc_err_sources[] = {
131 [IPC_ERR_CMD_NOT_SUPPORTED] =
132 "command not supported",
133 [IPC_ERR_CMD_NOT_SERVICED] =
134 "command not serviced",
135 [IPC_ERR_UNABLE_TO_SERVICE] =
137 [IPC_ERR_CMD_INVALID] =
139 [IPC_ERR_CMD_FAILED] =
141 [IPC_ERR_EMSECURITY] =
143 [IPC_ERR_UNSIGNEDKERNEL] =
147 /* Prevent concurrent calls to the PMC */
148 static DEFINE_MUTEX(ipclock);
150 static inline void ipc_send_command(u32 cmd)
153 if (ipcdev.irq_mode) {
154 reinit_completion(&ipcdev.cmd_complete);
157 writel(cmd, ipcdev.ipc_base + IPC_CMD);
160 static inline u32 ipc_read_status(void)
162 return readl(ipcdev.ipc_base + IPC_STATUS);
165 static inline void ipc_data_writel(u32 data, u32 offset)
167 writel(data, ipcdev.ipc_base + IPC_WRITE_BUFFER + offset);
170 static inline u8 ipc_data_readb(u32 offset)
172 return readb(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
175 static inline u32 ipc_data_readl(u32 offset)
177 return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
180 static int intel_pmc_ipc_check_status(void)
185 if (ipcdev.irq_mode) {
186 if (0 == wait_for_completion_timeout(
187 &ipcdev.cmd_complete, IPC_MAX_SEC * HZ))
190 int loop_count = IPC_LOOP_CNT;
192 while ((ipc_read_status() & IPC_STATUS_BUSY) && --loop_count)
198 status = ipc_read_status();
199 if (ret == -ETIMEDOUT) {
201 "IPC timed out, TS=0x%x, CMD=0x%x\n",
206 if (status & IPC_STATUS_ERR) {
210 i = (status >> IPC_CMD_SIZE) & 0xFF;
211 if (i < ARRAY_SIZE(ipc_err_sources))
213 "IPC failed: %s, STS=0x%x, CMD=0x%x\n",
214 ipc_err_sources[i], status, ipcdev.cmd);
217 "IPC failed: unknown, STS=0x%x, CMD=0x%x\n",
219 if ((i == IPC_ERR_UNSIGNEDKERNEL) || (i == IPC_ERR_EMSECURITY))
227 * intel_pmc_ipc_simple_command() - Simple IPC command
228 * @cmd: IPC command code.
229 * @sub: IPC command sub type.
231 * Send a simple IPC command to PMC when don't need to specify
232 * input/output data and source/dest pointers.
234 * Return: an IPC error code or 0 on success.
236 int intel_pmc_ipc_simple_command(int cmd, int sub)
240 mutex_lock(&ipclock);
241 if (ipcdev.dev == NULL) {
242 mutex_unlock(&ipclock);
245 ipc_send_command(sub << IPC_CMD_SUBCMD | cmd);
246 ret = intel_pmc_ipc_check_status();
247 mutex_unlock(&ipclock);
251 EXPORT_SYMBOL_GPL(intel_pmc_ipc_simple_command);
254 * intel_pmc_ipc_raw_cmd() - IPC command with data and pointers
255 * @cmd: IPC command code.
256 * @sub: IPC command sub type.
257 * @in: input data of this IPC command.
258 * @inlen: input data length in bytes.
259 * @out: output data of this IPC command.
260 * @outlen: output data length in dwords.
261 * @sptr: data writing to SPTR register.
262 * @dptr: data writing to DPTR register.
264 * Send an IPC command to PMC with input/output data and source/dest pointers.
266 * Return: an IPC error code or 0 on success.
268 int intel_pmc_ipc_raw_cmd(u32 cmd, u32 sub, u8 *in, u32 inlen, u32 *out,
269 u32 outlen, u32 dptr, u32 sptr)
275 if (inlen > IPC_DATA_BUFFER_SIZE || outlen > IPC_DATA_BUFFER_SIZE / 4)
278 mutex_lock(&ipclock);
279 if (ipcdev.dev == NULL) {
280 mutex_unlock(&ipclock);
283 memcpy(wbuf, in, inlen);
284 writel(dptr, ipcdev.ipc_base + IPC_DPTR);
285 writel(sptr, ipcdev.ipc_base + IPC_SPTR);
286 /* The input data register is 32bit register and inlen is in Byte */
287 for (i = 0; i < ((inlen + 3) / 4); i++)
288 ipc_data_writel(wbuf[i], 4 * i);
289 ipc_send_command((inlen << IPC_CMD_SIZE) |
290 (sub << IPC_CMD_SUBCMD) | cmd);
291 ret = intel_pmc_ipc_check_status();
293 /* out is read from 32bit register and outlen is in 32bit */
294 for (i = 0; i < outlen; i++)
295 *out++ = ipc_data_readl(4 * i);
297 mutex_unlock(&ipclock);
301 EXPORT_SYMBOL_GPL(intel_pmc_ipc_raw_cmd);
304 * intel_pmc_ipc_command() - IPC command with input/output data
305 * @cmd: IPC command code.
306 * @sub: IPC command sub type.
307 * @in: input data of this IPC command.
308 * @inlen: input data length in bytes.
309 * @out: output data of this IPC command.
310 * @outlen: output data length in dwords.
312 * Send an IPC command to PMC with input/output data.
314 * Return: an IPC error code or 0 on success.
316 int intel_pmc_ipc_command(u32 cmd, u32 sub, u8 *in, u32 inlen,
317 u32 *out, u32 outlen)
319 return intel_pmc_ipc_raw_cmd(cmd, sub, in, inlen, out, outlen, 0, 0);
321 EXPORT_SYMBOL_GPL(intel_pmc_ipc_command);
323 static irqreturn_t ioc(int irq, void *dev_id)
327 if (ipcdev.irq_mode) {
328 status = ipc_read_status();
329 writel(status | IPC_STATUS_IRQ, ipcdev.ipc_base + IPC_STATUS);
331 complete(&ipcdev.cmd_complete);
336 static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
338 resource_size_t pci_resource;
342 ipcdev.dev = &pci_dev_get(pdev)->dev;
343 ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
345 ret = pci_enable_device(pdev);
349 ret = pci_request_regions(pdev, "intel_pmc_ipc");
353 pci_resource = pci_resource_start(pdev, 0);
354 len = pci_resource_len(pdev, 0);
355 if (!pci_resource || !len) {
356 dev_err(&pdev->dev, "Failed to get resource\n");
360 init_completion(&ipcdev.cmd_complete);
362 if (request_irq(pdev->irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
363 dev_err(&pdev->dev, "Failed to request irq\n");
367 ipcdev.ipc_base = ioremap_nocache(pci_resource, len);
368 if (!ipcdev.ipc_base) {
369 dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
370 free_irq(pdev->irq, &ipcdev);
377 static void ipc_pci_remove(struct pci_dev *pdev)
379 free_irq(pdev->irq, &ipcdev);
380 pci_release_regions(pdev);
382 iounmap(ipcdev.ipc_base);
386 static const struct pci_device_id ipc_pci_ids[] = {
387 {PCI_VDEVICE(INTEL, 0x0a94), 0},
388 {PCI_VDEVICE(INTEL, 0x1a94), 0},
391 MODULE_DEVICE_TABLE(pci, ipc_pci_ids);
393 static struct pci_driver ipc_pci_driver = {
394 .name = "intel_pmc_ipc",
395 .id_table = ipc_pci_ids,
396 .probe = ipc_pci_probe,
397 .remove = ipc_pci_remove,
400 static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
401 struct device_attribute *attr,
402 const char *buf, size_t count)
408 ret = sscanf(buf, "%d %d", &cmd, &subcmd);
410 dev_err(dev, "Error args\n");
414 ret = intel_pmc_ipc_simple_command(cmd, subcmd);
416 dev_err(dev, "command %d error with %d\n", cmd, ret);
419 return (ssize_t)count;
422 static ssize_t intel_pmc_ipc_northpeak_store(struct device *dev,
423 struct device_attribute *attr,
424 const char *buf, size_t count)
430 if (kstrtoul(buf, 0, &val))
437 ret = intel_pmc_ipc_simple_command(PMC_IPC_NORTHPEAK_CTRL, subcmd);
439 dev_err(dev, "command north %d error with %d\n", subcmd, ret);
442 return (ssize_t)count;
445 static DEVICE_ATTR(simplecmd, S_IWUSR,
446 NULL, intel_pmc_ipc_simple_cmd_store);
447 static DEVICE_ATTR(northpeak, S_IWUSR,
448 NULL, intel_pmc_ipc_northpeak_store);
450 static struct attribute *intel_ipc_attrs[] = {
451 &dev_attr_northpeak.attr,
452 &dev_attr_simplecmd.attr,
456 static const struct attribute_group intel_ipc_group = {
457 .attrs = intel_ipc_attrs,
460 static struct resource punit_res_array[] = {
463 .flags = IORESOURCE_MEM,
466 .flags = IORESOURCE_MEM,
470 .flags = IORESOURCE_MEM,
473 .flags = IORESOURCE_MEM,
477 .flags = IORESOURCE_MEM,
480 .flags = IORESOURCE_MEM,
484 #define TCO_RESOURCE_ACPI_IO 0
485 #define TCO_RESOURCE_SMI_EN_IO 1
486 #define TCO_RESOURCE_GCR_MEM 2
487 static struct resource tco_res[] = {
490 .flags = IORESOURCE_IO,
494 .flags = IORESOURCE_IO,
498 .flags = IORESOURCE_MEM,
502 static struct itco_wdt_platform_data tco_info = {
503 .name = "Apollo Lake SoC",
507 #define TELEMETRY_RESOURCE_PUNIT_SSRAM 0
508 #define TELEMETRY_RESOURCE_PMC_SSRAM 1
509 static struct resource telemetry_res[] = {
512 .flags = IORESOURCE_MEM,
515 .flags = IORESOURCE_MEM,
519 static int ipc_create_punit_device(void)
521 struct platform_device *pdev;
524 pdev = platform_device_alloc(PUNIT_DEVICE_NAME, -1);
526 dev_err(ipcdev.dev, "Failed to alloc punit platform device\n");
530 pdev->dev.parent = ipcdev.dev;
531 ret = platform_device_add_resources(pdev, punit_res_array,
532 ARRAY_SIZE(punit_res_array));
534 dev_err(ipcdev.dev, "Failed to add platform punit resources\n");
538 ret = platform_device_add(pdev);
540 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
543 ipcdev.punit_dev = pdev;
547 platform_device_put(pdev);
551 static int ipc_create_tco_device(void)
553 struct platform_device *pdev;
554 struct resource *res;
557 pdev = platform_device_alloc(TCO_DEVICE_NAME, -1);
559 dev_err(ipcdev.dev, "Failed to alloc tco platform device\n");
563 pdev->dev.parent = ipcdev.dev;
565 res = tco_res + TCO_RESOURCE_ACPI_IO;
566 res->start = ipcdev.acpi_io_base + TCO_BASE_OFFSET;
567 res->end = res->start + TCO_REGS_SIZE - 1;
569 res = tco_res + TCO_RESOURCE_SMI_EN_IO;
570 res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
571 res->end = res->start + SMI_EN_SIZE - 1;
573 res = tco_res + TCO_RESOURCE_GCR_MEM;
574 res->start = ipcdev.gcr_base;
575 res->end = res->start + ipcdev.gcr_size - 1;
577 ret = platform_device_add_resources(pdev, tco_res, ARRAY_SIZE(tco_res));
579 dev_err(ipcdev.dev, "Failed to add tco platform resources\n");
583 ret = platform_device_add_data(pdev, &tco_info, sizeof(tco_info));
585 dev_err(ipcdev.dev, "Failed to add tco platform data\n");
589 ret = platform_device_add(pdev);
591 dev_err(ipcdev.dev, "Failed to add tco platform device\n");
594 ipcdev.tco_dev = pdev;
598 platform_device_put(pdev);
602 static int ipc_create_telemetry_device(void)
604 struct platform_device *pdev;
605 struct resource *res;
608 pdev = platform_device_alloc(TELEMETRY_DEVICE_NAME, -1);
611 "Failed to allocate telemetry platform device\n");
615 pdev->dev.parent = ipcdev.dev;
617 res = telemetry_res + TELEMETRY_RESOURCE_PUNIT_SSRAM;
618 res->start = ipcdev.telem_punit_ssram_base;
619 res->end = res->start + ipcdev.telem_punit_ssram_size - 1;
621 res = telemetry_res + TELEMETRY_RESOURCE_PMC_SSRAM;
622 res->start = ipcdev.telem_pmc_ssram_base;
623 res->end = res->start + ipcdev.telem_pmc_ssram_size - 1;
625 ret = platform_device_add_resources(pdev, telemetry_res,
626 ARRAY_SIZE(telemetry_res));
629 "Failed to add telemetry platform resources\n");
633 ret = platform_device_add(pdev);
636 "Failed to add telemetry platform device\n");
639 ipcdev.telemetry_dev = pdev;
643 platform_device_put(pdev);
647 static int ipc_create_pmc_devices(void)
651 ret = ipc_create_tco_device();
653 dev_err(ipcdev.dev, "Failed to add tco platform device\n");
656 ret = ipc_create_punit_device();
658 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
659 platform_device_unregister(ipcdev.tco_dev);
662 if (!ipcdev.telem_res_inval) {
663 ret = ipc_create_telemetry_device();
666 "Failed to add telemetry platform device\n");
672 static int ipc_plat_get_res(struct platform_device *pdev)
674 struct resource *res, *punit_res;
678 res = platform_get_resource(pdev, IORESOURCE_IO,
679 PLAT_RESOURCE_ACPI_IO_INDEX);
681 dev_err(&pdev->dev, "Failed to get io resource\n");
684 size = resource_size(res);
685 ipcdev.acpi_io_base = res->start;
686 ipcdev.acpi_io_size = size;
687 dev_info(&pdev->dev, "io res: %pR\n", res);
689 /* This is index 0 to cover BIOS data register */
690 punit_res = punit_res_array;
691 res = platform_get_resource(pdev, IORESOURCE_MEM,
692 PLAT_RESOURCE_BIOS_DATA_INDEX);
694 dev_err(&pdev->dev, "Failed to get res of punit BIOS data\n");
698 dev_info(&pdev->dev, "punit BIOS data res: %pR\n", res);
700 res = platform_get_resource(pdev, IORESOURCE_MEM,
701 PLAT_RESOURCE_BIOS_IFACE_INDEX);
703 dev_err(&pdev->dev, "Failed to get res of punit BIOS iface\n");
706 /* This is index 1 to cover BIOS interface register */
708 dev_info(&pdev->dev, "punit BIOS interface res: %pR\n", res);
710 res = platform_get_resource(pdev, IORESOURCE_MEM,
711 PLAT_RESOURCE_ISP_DATA_INDEX);
713 dev_err(&pdev->dev, "Failed to get res of punit ISP data\n");
716 /* This is index 2 to cover ISP data register */
718 dev_info(&pdev->dev, "punit ISP data res: %pR\n", res);
720 res = platform_get_resource(pdev, IORESOURCE_MEM,
721 PLAT_RESOURCE_ISP_IFACE_INDEX);
723 dev_err(&pdev->dev, "Failed to get res of punit ISP iface\n");
726 /* This is index 3 to cover ISP interface register */
728 dev_info(&pdev->dev, "punit ISP interface res: %pR\n", res);
730 res = platform_get_resource(pdev, IORESOURCE_MEM,
731 PLAT_RESOURCE_GTD_DATA_INDEX);
733 dev_err(&pdev->dev, "Failed to get res of punit GTD data\n");
736 /* This is index 4 to cover GTD data register */
738 dev_info(&pdev->dev, "punit GTD data res: %pR\n", res);
740 res = platform_get_resource(pdev, IORESOURCE_MEM,
741 PLAT_RESOURCE_GTD_IFACE_INDEX);
743 dev_err(&pdev->dev, "Failed to get res of punit GTD iface\n");
746 /* This is index 5 to cover GTD interface register */
748 dev_info(&pdev->dev, "punit GTD interface res: %pR\n", res);
750 res = platform_get_resource(pdev, IORESOURCE_MEM,
751 PLAT_RESOURCE_IPC_INDEX);
753 dev_err(&pdev->dev, "Failed to get ipc resource\n");
756 size = PLAT_RESOURCE_IPC_SIZE;
757 if (!request_mem_region(res->start, size, pdev->name)) {
758 dev_err(&pdev->dev, "Failed to request ipc resource\n");
761 addr = ioremap_nocache(res->start, size);
763 dev_err(&pdev->dev, "I/O memory remapping failed\n");
764 release_mem_region(res->start, size);
767 ipcdev.ipc_base = addr;
769 ipcdev.gcr_base = res->start + size;
770 ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
771 dev_info(&pdev->dev, "ipc res: %pR\n", res);
773 ipcdev.telem_res_inval = 0;
774 res = platform_get_resource(pdev, IORESOURCE_MEM,
775 PLAT_RESOURCE_TELEM_SSRAM_INDEX);
777 dev_err(&pdev->dev, "Failed to get telemetry ssram resource\n");
778 ipcdev.telem_res_inval = 1;
780 ipcdev.telem_punit_ssram_base = res->start +
781 TELEM_PUNIT_SSRAM_OFFSET;
782 ipcdev.telem_punit_ssram_size = TELEM_SSRAM_SIZE;
783 ipcdev.telem_pmc_ssram_base = res->start +
784 TELEM_PMC_SSRAM_OFFSET;
785 ipcdev.telem_pmc_ssram_size = TELEM_SSRAM_SIZE;
786 dev_info(&pdev->dev, "telemetry ssram res: %pR\n", res);
793 static const struct acpi_device_id ipc_acpi_ids[] = {
797 MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids);
800 static int ipc_plat_probe(struct platform_device *pdev)
802 struct resource *res;
805 ipcdev.dev = &pdev->dev;
806 ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
807 init_completion(&ipcdev.cmd_complete);
809 ipcdev.irq = platform_get_irq(pdev, 0);
810 if (ipcdev.irq < 0) {
811 dev_err(&pdev->dev, "Failed to get irq\n");
815 ret = ipc_plat_get_res(pdev);
817 dev_err(&pdev->dev, "Failed to request resource\n");
821 ret = ipc_create_pmc_devices();
823 dev_err(&pdev->dev, "Failed to create pmc devices\n");
827 if (request_irq(ipcdev.irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
828 dev_err(&pdev->dev, "Failed to request irq\n");
833 ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
835 dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
842 free_irq(ipcdev.irq, &ipcdev);
844 platform_device_unregister(ipcdev.tco_dev);
845 platform_device_unregister(ipcdev.punit_dev);
846 platform_device_unregister(ipcdev.telemetry_dev);
848 iounmap(ipcdev.ipc_base);
849 res = platform_get_resource(pdev, IORESOURCE_MEM,
850 PLAT_RESOURCE_IPC_INDEX);
852 release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
856 static int ipc_plat_remove(struct platform_device *pdev)
858 struct resource *res;
860 sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
861 free_irq(ipcdev.irq, &ipcdev);
862 platform_device_unregister(ipcdev.tco_dev);
863 platform_device_unregister(ipcdev.punit_dev);
864 platform_device_unregister(ipcdev.telemetry_dev);
865 iounmap(ipcdev.ipc_base);
866 res = platform_get_resource(pdev, IORESOURCE_MEM,
867 PLAT_RESOURCE_IPC_INDEX);
869 release_mem_region(res->start, PLAT_RESOURCE_IPC_SIZE);
874 static struct platform_driver ipc_plat_driver = {
875 .remove = ipc_plat_remove,
876 .probe = ipc_plat_probe,
878 .name = "pmc-ipc-plat",
879 .acpi_match_table = ACPI_PTR(ipc_acpi_ids),
883 static int __init intel_pmc_ipc_init(void)
887 ret = platform_driver_register(&ipc_plat_driver);
889 pr_err("Failed to register PMC ipc platform driver\n");
892 ret = pci_register_driver(&ipc_pci_driver);
894 pr_err("Failed to register PMC ipc pci driver\n");
895 platform_driver_unregister(&ipc_plat_driver);
901 static void __exit intel_pmc_ipc_exit(void)
903 pci_unregister_driver(&ipc_pci_driver);
904 platform_driver_unregister(&ipc_plat_driver);
907 MODULE_AUTHOR("Zha Qipeng <qipeng.zha@intel.com>");
908 MODULE_DESCRIPTION("Intel PMC IPC driver");
909 MODULE_LICENSE("GPL");
911 /* Some modules are dependent on this, so init earlier */
912 fs_initcall(intel_pmc_ipc_init);
913 module_exit(intel_pmc_ipc_exit);