1 // SPDX-License-Identifier: GPL-2.0
2
3 /*
4 * Intel PMC Core platform init
5 * Copyright (c) 2019, Google Inc.
6 * Author - Rajat Jain
7 *
8 * This code instantiates platform devices for intel_pmc_core driver, only
9 * on supported platforms that may not have the ACPI devices in the ACPI tables.
10 * No new platforms should be added here, because we expect that new platforms
11 * should all have the ACPI device, which is the preferred way of enumeration.
12 */
13
14 #include <linux/acpi.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17
18 #include <asm/cpu_device_id.h>
19 #include <asm/intel-family.h>
20
intel_pmc_core_release(struct device * dev)21 static void intel_pmc_core_release(struct device *dev)
22 {
23 kfree(dev);
24 }
25
26 static struct platform_device *pmc_core_device;
27
28 /*
29 * intel_pmc_core_platform_ids is the list of platforms where we want to
30 * instantiate the platform_device if not already instantiated. This is
31 * different than intel_pmc_core_ids in intel_pmc_core.c which is the
32 * list of platforms that the driver supports for pmc_core device. The
33 * other list may grow, but this list should not.
34 */
35 static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {
36 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, &pmc_core_device),
37 X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, &pmc_core_device),
38 X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, &pmc_core_device),
39 X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, &pmc_core_device),
40 X86_MATCH_INTEL_FAM6_MODEL(CANNONLAKE_L, &pmc_core_device),
41 X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_L, &pmc_core_device),
42 X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE, &pmc_core_device),
43 X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE_L, &pmc_core_device),
44 {}
45 };
46 MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);
47
pmc_core_platform_init(void)48 static int __init pmc_core_platform_init(void)
49 {
50 int retval;
51
52 /* Skip creating the platform device if ACPI already has a device */
53 if (acpi_dev_present("INT33A1", NULL, -1))
54 return -ENODEV;
55
56 if (!x86_match_cpu(intel_pmc_core_platform_ids))
57 return -ENODEV;
58
59 pmc_core_device = kzalloc(sizeof(*pmc_core_device), GFP_KERNEL);
60 if (!pmc_core_device)
61 return -ENOMEM;
62
63 pmc_core_device->name = "intel_pmc_core";
64 pmc_core_device->dev.release = intel_pmc_core_release;
65
66 retval = platform_device_register(pmc_core_device);
67 if (retval)
68 platform_device_put(pmc_core_device);
69
70 return retval;
71 }
72
pmc_core_platform_exit(void)73 static void __exit pmc_core_platform_exit(void)
74 {
75 platform_device_unregister(pmc_core_device);
76 }
77
78 module_init(pmc_core_platform_init);
79 module_exit(pmc_core_platform_exit);
80 MODULE_LICENSE("GPL v2");
81