1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel_pmc_core_pltdrv.c b/drivers/platform/x86/intel_pmc_core_pltdrv.c
new file mode 100644
index 000000000000..a8754a6db1b8
--- /dev/null
+++ b/drivers/platform/x86/intel_pmc_core_pltdrv.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Intel PMC Core platform init
+ * Copyright (c) 2019, Google Inc.
+ * Author - Rajat Jain
+ *
+ * This code instantiates platform devices for intel_pmc_core driver, only
+ * on supported platforms that may not have the ACPI devices in the ACPI tables.
+ * No new platforms should be added here, because we expect that new platforms
+ * should all have the ACPI device, which is the preferred way of enumeration.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/cpu_device_id.h>
+#include <asm/intel-family.h>
+
+static struct platform_device pmc_core_device = {
+	.name = "intel_pmc_core",
+};
+
+/*
+ * intel_pmc_core_platform_ids is the list of platforms where we want to
+ * instantiate the platform_device if not already instantiated. This is
+ * different than intel_pmc_core_ids in intel_pmc_core.c which is the
+ * list of platforms that the driver supports for pmc_core device. The
+ * other list may grow, but this list should not.
+ */
+static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {
+	INTEL_CPU_FAM6(SKYLAKE_MOBILE, pmc_core_device),
+	INTEL_CPU_FAM6(SKYLAKE_DESKTOP, pmc_core_device),
+	INTEL_CPU_FAM6(KABYLAKE_MOBILE, pmc_core_device),
+	INTEL_CPU_FAM6(KABYLAKE_DESKTOP, pmc_core_device),
+	INTEL_CPU_FAM6(CANNONLAKE_MOBILE, pmc_core_device),
+	INTEL_CPU_FAM6(ICELAKE_MOBILE, pmc_core_device),
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);
+
+static int __init pmc_core_platform_init(void)
+{
+	/* Skip creating the platform device if ACPI already has a device */
+	if (acpi_dev_present("INT33A1", NULL, -1))
+		return -ENODEV;
+
+	if (!x86_match_cpu(intel_pmc_core_platform_ids))
+		return -ENODEV;
+
+	return platform_device_register(&pmc_core_device);
+}
+
+static void __exit pmc_core_platform_exit(void)
+{
+	platform_device_unregister(&pmc_core_device);
+}
+
+module_init(pmc_core_platform_init);
+module_exit(pmc_core_platform_exit);
+MODULE_LICENSE("GPL v2");