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_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
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.
87 #define TCO_DEVICE_NAME "iTCO_wdt"
88 #define SMI_EN_OFFSET 0x40
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 #define TCO_PMC_OFFSET 0x8
98 #define TCO_PMC_SIZE 0x4
100 static const int iTCO_version = 3;
102 static struct intel_pmc_ipc_dev {
104 void __iomem *ipc_base;
108 struct completion cmd_complete;
110 /* The following PMC BARs share the same ACPI device with the IPC */
111 resource_size_t acpi_io_base;
113 struct platform_device *tco_dev;
116 resource_size_t gcr_base;
120 struct platform_device *punit_dev;
123 resource_size_t telem_pmc_ssram_base;
124 resource_size_t telem_punit_ssram_base;
125 int telem_pmc_ssram_size;
126 int telem_punit_ssram_size;
128 struct platform_device *telemetry_dev;
131 static char *ipc_err_sources[] = {
134 [IPC_ERR_CMD_NOT_SUPPORTED] =
135 "command not supported",
136 [IPC_ERR_CMD_NOT_SERVICED] =
137 "command not serviced",
138 [IPC_ERR_UNABLE_TO_SERVICE] =
140 [IPC_ERR_CMD_INVALID] =
142 [IPC_ERR_CMD_FAILED] =
144 [IPC_ERR_EMSECURITY] =
146 [IPC_ERR_UNSIGNEDKERNEL] =
150 /* Prevent concurrent calls to the PMC */
151 static DEFINE_MUTEX(ipclock);
153 static inline void ipc_send_command(u32 cmd)
156 if (ipcdev.irq_mode) {
157 reinit_completion(&ipcdev.cmd_complete);
160 writel(cmd, ipcdev.ipc_base + IPC_CMD);
163 static inline u32 ipc_read_status(void)
165 return readl(ipcdev.ipc_base + IPC_STATUS);
168 static inline void ipc_data_writel(u32 data, u32 offset)
170 writel(data, ipcdev.ipc_base + IPC_WRITE_BUFFER + offset);
173 static inline u8 ipc_data_readb(u32 offset)
175 return readb(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
178 static inline u32 ipc_data_readl(u32 offset)
180 return readl(ipcdev.ipc_base + IPC_READ_BUFFER + offset);
183 static int intel_pmc_ipc_check_status(void)
188 if (ipcdev.irq_mode) {
189 if (0 == wait_for_completion_timeout(
190 &ipcdev.cmd_complete, IPC_MAX_SEC * HZ))
193 int loop_count = IPC_LOOP_CNT;
195 while ((ipc_read_status() & IPC_STATUS_BUSY) && --loop_count)
201 status = ipc_read_status();
202 if (ret == -ETIMEDOUT) {
204 "IPC timed out, TS=0x%x, CMD=0x%x\n",
209 if (status & IPC_STATUS_ERR) {
213 i = (status >> IPC_CMD_SIZE) & 0xFF;
214 if (i < ARRAY_SIZE(ipc_err_sources))
216 "IPC failed: %s, STS=0x%x, CMD=0x%x\n",
217 ipc_err_sources[i], status, ipcdev.cmd);
220 "IPC failed: unknown, STS=0x%x, CMD=0x%x\n",
222 if ((i == IPC_ERR_UNSIGNEDKERNEL) || (i == IPC_ERR_EMSECURITY))
230 * intel_pmc_ipc_simple_command() - Simple IPC command
231 * @cmd: IPC command code.
232 * @sub: IPC command sub type.
234 * Send a simple IPC command to PMC when don't need to specify
235 * input/output data and source/dest pointers.
237 * Return: an IPC error code or 0 on success.
239 int intel_pmc_ipc_simple_command(int cmd, int sub)
243 mutex_lock(&ipclock);
244 if (ipcdev.dev == NULL) {
245 mutex_unlock(&ipclock);
248 ipc_send_command(sub << IPC_CMD_SUBCMD | cmd);
249 ret = intel_pmc_ipc_check_status();
250 mutex_unlock(&ipclock);
254 EXPORT_SYMBOL_GPL(intel_pmc_ipc_simple_command);
257 * intel_pmc_ipc_raw_cmd() - IPC command with data and pointers
258 * @cmd: IPC command code.
259 * @sub: IPC command sub type.
260 * @in: input data of this IPC command.
261 * @inlen: input data length in bytes.
262 * @out: output data of this IPC command.
263 * @outlen: output data length in dwords.
264 * @sptr: data writing to SPTR register.
265 * @dptr: data writing to DPTR register.
267 * Send an IPC command to PMC with input/output data and source/dest pointers.
269 * Return: an IPC error code or 0 on success.
271 int intel_pmc_ipc_raw_cmd(u32 cmd, u32 sub, u8 *in, u32 inlen, u32 *out,
272 u32 outlen, u32 dptr, u32 sptr)
278 if (inlen > IPC_DATA_BUFFER_SIZE || outlen > IPC_DATA_BUFFER_SIZE / 4)
281 mutex_lock(&ipclock);
282 if (ipcdev.dev == NULL) {
283 mutex_unlock(&ipclock);
286 memcpy(wbuf, in, inlen);
287 writel(dptr, ipcdev.ipc_base + IPC_DPTR);
288 writel(sptr, ipcdev.ipc_base + IPC_SPTR);
289 /* The input data register is 32bit register and inlen is in Byte */
290 for (i = 0; i < ((inlen + 3) / 4); i++)
291 ipc_data_writel(wbuf[i], 4 * i);
292 ipc_send_command((inlen << IPC_CMD_SIZE) |
293 (sub << IPC_CMD_SUBCMD) | cmd);
294 ret = intel_pmc_ipc_check_status();
296 /* out is read from 32bit register and outlen is in 32bit */
297 for (i = 0; i < outlen; i++)
298 *out++ = ipc_data_readl(4 * i);
300 mutex_unlock(&ipclock);
304 EXPORT_SYMBOL_GPL(intel_pmc_ipc_raw_cmd);
307 * intel_pmc_ipc_command() - IPC command with input/output data
308 * @cmd: IPC command code.
309 * @sub: IPC command sub type.
310 * @in: input data of this IPC command.
311 * @inlen: input data length in bytes.
312 * @out: output data of this IPC command.
313 * @outlen: output data length in dwords.
315 * Send an IPC command to PMC with input/output data.
317 * Return: an IPC error code or 0 on success.
319 int intel_pmc_ipc_command(u32 cmd, u32 sub, u8 *in, u32 inlen,
320 u32 *out, u32 outlen)
322 return intel_pmc_ipc_raw_cmd(cmd, sub, in, inlen, out, outlen, 0, 0);
324 EXPORT_SYMBOL_GPL(intel_pmc_ipc_command);
326 static irqreturn_t ioc(int irq, void *dev_id)
330 if (ipcdev.irq_mode) {
331 status = ipc_read_status();
332 writel(status | IPC_STATUS_IRQ, ipcdev.ipc_base + IPC_STATUS);
334 complete(&ipcdev.cmd_complete);
339 static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
341 resource_size_t pci_resource;
345 ipcdev.dev = &pci_dev_get(pdev)->dev;
346 ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
348 ret = pci_enable_device(pdev);
352 ret = pci_request_regions(pdev, "intel_pmc_ipc");
356 pci_resource = pci_resource_start(pdev, 0);
357 len = pci_resource_len(pdev, 0);
358 if (!pci_resource || !len) {
359 dev_err(&pdev->dev, "Failed to get resource\n");
363 init_completion(&ipcdev.cmd_complete);
365 if (request_irq(pdev->irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
366 dev_err(&pdev->dev, "Failed to request irq\n");
370 ipcdev.ipc_base = ioremap_nocache(pci_resource, len);
371 if (!ipcdev.ipc_base) {
372 dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
373 free_irq(pdev->irq, &ipcdev);
380 static void ipc_pci_remove(struct pci_dev *pdev)
382 free_irq(pdev->irq, &ipcdev);
383 pci_release_regions(pdev);
385 iounmap(ipcdev.ipc_base);
389 static const struct pci_device_id ipc_pci_ids[] = {
390 {PCI_VDEVICE(INTEL, 0x0a94), 0},
391 {PCI_VDEVICE(INTEL, 0x1a94), 0},
394 MODULE_DEVICE_TABLE(pci, ipc_pci_ids);
396 static struct pci_driver ipc_pci_driver = {
397 .name = "intel_pmc_ipc",
398 .id_table = ipc_pci_ids,
399 .probe = ipc_pci_probe,
400 .remove = ipc_pci_remove,
403 static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
404 struct device_attribute *attr,
405 const char *buf, size_t count)
411 ret = sscanf(buf, "%d %d", &cmd, &subcmd);
413 dev_err(dev, "Error args\n");
417 ret = intel_pmc_ipc_simple_command(cmd, subcmd);
419 dev_err(dev, "command %d error with %d\n", cmd, ret);
422 return (ssize_t)count;
425 static ssize_t intel_pmc_ipc_northpeak_store(struct device *dev,
426 struct device_attribute *attr,
427 const char *buf, size_t count)
433 if (kstrtoul(buf, 0, &val))
440 ret = intel_pmc_ipc_simple_command(PMC_IPC_NORTHPEAK_CTRL, subcmd);
442 dev_err(dev, "command north %d error with %d\n", subcmd, ret);
445 return (ssize_t)count;
448 static DEVICE_ATTR(simplecmd, S_IWUSR,
449 NULL, intel_pmc_ipc_simple_cmd_store);
450 static DEVICE_ATTR(northpeak, S_IWUSR,
451 NULL, intel_pmc_ipc_northpeak_store);
453 static struct attribute *intel_ipc_attrs[] = {
454 &dev_attr_northpeak.attr,
455 &dev_attr_simplecmd.attr,
459 static const struct attribute_group intel_ipc_group = {
460 .attrs = intel_ipc_attrs,
463 static struct resource punit_res_array[] = {
466 .flags = IORESOURCE_MEM,
469 .flags = IORESOURCE_MEM,
473 .flags = IORESOURCE_MEM,
476 .flags = IORESOURCE_MEM,
480 .flags = IORESOURCE_MEM,
483 .flags = IORESOURCE_MEM,
487 #define TCO_RESOURCE_ACPI_IO 0
488 #define TCO_RESOURCE_SMI_EN_IO 1
489 #define TCO_RESOURCE_GCR_MEM 2
490 static struct resource tco_res[] = {
493 .flags = IORESOURCE_IO,
497 .flags = IORESOURCE_IO,
501 .flags = IORESOURCE_MEM,
505 static struct itco_wdt_platform_data tco_info = {
506 .name = "Apollo Lake SoC",
510 #define TELEMETRY_RESOURCE_PUNIT_SSRAM 0
511 #define TELEMETRY_RESOURCE_PMC_SSRAM 1
512 static struct resource telemetry_res[] = {
515 .flags = IORESOURCE_MEM,
518 .flags = IORESOURCE_MEM,
522 static int ipc_create_punit_device(void)
524 struct platform_device *pdev;
527 pdev = platform_device_alloc(PUNIT_DEVICE_NAME, -1);
529 dev_err(ipcdev.dev, "Failed to alloc punit platform device\n");
533 pdev->dev.parent = ipcdev.dev;
534 ret = platform_device_add_resources(pdev, punit_res_array,
535 ARRAY_SIZE(punit_res_array));
537 dev_err(ipcdev.dev, "Failed to add platform punit resources\n");
541 ret = platform_device_add(pdev);
543 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
546 ipcdev.punit_dev = pdev;
550 platform_device_put(pdev);
554 static int ipc_create_tco_device(void)
556 struct platform_device *pdev;
557 struct resource *res;
560 pdev = platform_device_alloc(TCO_DEVICE_NAME, -1);
562 dev_err(ipcdev.dev, "Failed to alloc tco platform device\n");
566 pdev->dev.parent = ipcdev.dev;
568 res = tco_res + TCO_RESOURCE_ACPI_IO;
569 res->start = ipcdev.acpi_io_base + TCO_BASE_OFFSET;
570 res->end = res->start + TCO_REGS_SIZE - 1;
572 res = tco_res + TCO_RESOURCE_SMI_EN_IO;
573 res->start = ipcdev.acpi_io_base + SMI_EN_OFFSET;
574 res->end = res->start + SMI_EN_SIZE - 1;
576 res = tco_res + TCO_RESOURCE_GCR_MEM;
577 res->start = ipcdev.gcr_base + TCO_PMC_OFFSET;
578 res->end = res->start + TCO_PMC_SIZE - 1;
580 ret = platform_device_add_resources(pdev, tco_res, ARRAY_SIZE(tco_res));
582 dev_err(ipcdev.dev, "Failed to add tco platform resources\n");
586 ret = platform_device_add_data(pdev, &tco_info, sizeof(tco_info));
588 dev_err(ipcdev.dev, "Failed to add tco platform data\n");
592 ret = platform_device_add(pdev);
594 dev_err(ipcdev.dev, "Failed to add tco platform device\n");
597 ipcdev.tco_dev = pdev;
601 platform_device_put(pdev);
605 static int ipc_create_telemetry_device(void)
607 struct platform_device *pdev;
608 struct resource *res;
611 pdev = platform_device_alloc(TELEMETRY_DEVICE_NAME, -1);
614 "Failed to allocate telemetry platform device\n");
618 pdev->dev.parent = ipcdev.dev;
620 res = telemetry_res + TELEMETRY_RESOURCE_PUNIT_SSRAM;
621 res->start = ipcdev.telem_punit_ssram_base;
622 res->end = res->start + ipcdev.telem_punit_ssram_size - 1;
624 res = telemetry_res + TELEMETRY_RESOURCE_PMC_SSRAM;
625 res->start = ipcdev.telem_pmc_ssram_base;
626 res->end = res->start + ipcdev.telem_pmc_ssram_size - 1;
628 ret = platform_device_add_resources(pdev, telemetry_res,
629 ARRAY_SIZE(telemetry_res));
632 "Failed to add telemetry platform resources\n");
636 ret = platform_device_add(pdev);
639 "Failed to add telemetry platform device\n");
642 ipcdev.telemetry_dev = pdev;
646 platform_device_put(pdev);
650 static int ipc_create_pmc_devices(void)
654 ret = ipc_create_tco_device();
656 dev_err(ipcdev.dev, "Failed to add tco platform device\n");
659 ret = ipc_create_punit_device();
661 dev_err(ipcdev.dev, "Failed to add punit platform device\n");
662 platform_device_unregister(ipcdev.tco_dev);
665 if (!ipcdev.telem_res_inval) {
666 ret = ipc_create_telemetry_device();
669 "Failed to add telemetry platform device\n");
675 static int ipc_plat_get_res(struct platform_device *pdev)
677 struct resource *res, *punit_res;
681 res = platform_get_resource(pdev, IORESOURCE_IO,
682 PLAT_RESOURCE_ACPI_IO_INDEX);
684 dev_err(&pdev->dev, "Failed to get io resource\n");
687 size = resource_size(res);
688 ipcdev.acpi_io_base = res->start;
689 ipcdev.acpi_io_size = size;
690 dev_info(&pdev->dev, "io res: %pR\n", res);
692 punit_res = punit_res_array;
693 /* This is index 0 to cover BIOS data register */
694 res = platform_get_resource(pdev, IORESOURCE_MEM,
695 PLAT_RESOURCE_BIOS_DATA_INDEX);
697 dev_err(&pdev->dev, "Failed to get res of punit BIOS data\n");
701 dev_info(&pdev->dev, "punit BIOS data res: %pR\n", res);
703 /* This is index 1 to cover BIOS interface register */
704 res = platform_get_resource(pdev, IORESOURCE_MEM,
705 PLAT_RESOURCE_BIOS_IFACE_INDEX);
707 dev_err(&pdev->dev, "Failed to get res of punit BIOS iface\n");
711 dev_info(&pdev->dev, "punit BIOS interface res: %pR\n", res);
713 /* This is index 2 to cover ISP data register, optional */
714 res = platform_get_resource(pdev, IORESOURCE_MEM,
715 PLAT_RESOURCE_ISP_DATA_INDEX);
719 dev_info(&pdev->dev, "punit ISP data res: %pR\n", res);
722 /* This is index 3 to cover ISP interface register, optional */
723 res = platform_get_resource(pdev, IORESOURCE_MEM,
724 PLAT_RESOURCE_ISP_IFACE_INDEX);
728 dev_info(&pdev->dev, "punit ISP interface res: %pR\n", res);
731 /* This is index 4 to cover GTD data register, optional */
732 res = platform_get_resource(pdev, IORESOURCE_MEM,
733 PLAT_RESOURCE_GTD_DATA_INDEX);
737 dev_info(&pdev->dev, "punit GTD data res: %pR\n", res);
740 /* This is index 5 to cover GTD interface register, optional */
741 res = platform_get_resource(pdev, IORESOURCE_MEM,
742 PLAT_RESOURCE_GTD_IFACE_INDEX);
746 dev_info(&pdev->dev, "punit GTD interface res: %pR\n", res);
749 res = platform_get_resource(pdev, IORESOURCE_MEM,
750 PLAT_RESOURCE_IPC_INDEX);
752 dev_err(&pdev->dev, "Failed to get ipc resource\n");
755 size = PLAT_RESOURCE_IPC_SIZE;
756 if (!request_mem_region(res->start, size, pdev->name)) {
757 dev_err(&pdev->dev, "Failed to request ipc resource\n");
760 addr = ioremap_nocache(res->start, size);
762 dev_err(&pdev->dev, "I/O memory remapping failed\n");
763 release_mem_region(res->start, size);
766 ipcdev.ipc_base = addr;
768 ipcdev.gcr_base = res->start + PLAT_RESOURCE_GCR_OFFSET;
769 ipcdev.gcr_size = PLAT_RESOURCE_GCR_SIZE;
770 dev_info(&pdev->dev, "ipc res: %pR\n", res);
772 ipcdev.telem_res_inval = 0;
773 res = platform_get_resource(pdev, IORESOURCE_MEM,
774 PLAT_RESOURCE_TELEM_SSRAM_INDEX);
776 dev_err(&pdev->dev, "Failed to get telemetry ssram resource\n");
777 ipcdev.telem_res_inval = 1;
779 ipcdev.telem_punit_ssram_base = res->start +
780 TELEM_PUNIT_SSRAM_OFFSET;
781 ipcdev.telem_punit_ssram_size = TELEM_SSRAM_SIZE;
782 ipcdev.telem_pmc_ssram_base = res->start +
783 TELEM_PMC_SSRAM_OFFSET;
784 ipcdev.telem_pmc_ssram_size = TELEM_SSRAM_SIZE;
785 dev_info(&pdev->dev, "telemetry ssram res: %pR\n", res);
792 static const struct acpi_device_id ipc_acpi_ids[] = {
796 MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids);
799 static int ipc_plat_probe(struct platform_device *pdev)
801 struct resource *res;
804 ipcdev.dev = &pdev->dev;
805 ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
806 init_completion(&ipcdev.cmd_complete);
808 ipcdev.irq = platform_get_irq(pdev, 0);
809 if (ipcdev.irq < 0) {
810 dev_err(&pdev->dev, "Failed to get irq\n");
814 ret = ipc_plat_get_res(pdev);
816 dev_err(&pdev->dev, "Failed to request resource\n");
820 ret = ipc_create_pmc_devices();
822 dev_err(&pdev->dev, "Failed to create pmc devices\n");
826 if (request_irq(ipcdev.irq, ioc, IRQF_NO_SUSPEND,
827 "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);