Intel Elkhart Lake exposes SCU/PMC as an ACPI device that only supports
IPC functionality so add a platform driver supporting it. Interrupt is
optional so we let intel_scu_ipc_probe() to decide based on the passed
platform data whether it uses interrupt or polling.
Co-developed-by: Divya Sasidharan <divya.s.sasidharan@xxxxxxxxx>
Signed-off-by: Divya Sasidharan <divya.s.sasidharan@xxxxxxxxx>
Co-developed-by: Rajmohan Mani <rajmohan.mani@xxxxxxxxx>
Signed-off-by: Rajmohan Mani <rajmohan.mani@xxxxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
---
drivers/platform/x86/Kconfig | 9 ++++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/intel_scu_pltdrv.c | 58 +++++++++++++++++++++++++
3 files changed, 68 insertions(+)
create mode 100644 drivers/platform/x86/intel_scu_pltdrv.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 642316761443..4a888b5270e3 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1356,6 +1356,15 @@ config INTEL_SCU_PCI
Broxton
Apollo Lake
+config INTEL_SCU_PLATFORM
+ tristate "Intel SCU platform driver"
+ depends on ACPI
+ select INTEL_SCU
+ help
+ This driver is used to bridge the communications between kernel
+ and SCU (sometimes called PMC as well). The driver currently
+ supports Intel Elkhart Lake and compatible platforms.
+
config INTEL_SCU_IPC_UTIL
tristate "Intel SCU IPC utility driver"
depends on INTEL_SCU
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 04db27a25946..70284a52f24f 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -141,6 +141,7 @@ obj-$(CONFIG_INTEL_PMC_CORE) += intel_pmc_core.o intel_pmc_core_pltdrv.o
obj-$(CONFIG_INTEL_PUNIT_IPC) += intel_punit_ipc.o
obj-$(CONFIG_INTEL_SCU_IPC) += intel_scu_ipc.o
obj-$(CONFIG_INTEL_SCU_PCI) += intel_scu_pcidrv.o
+obj-$(CONFIG_INTEL_SCU_PLATFORM) += intel_scu_pltdrv.o
obj-$(CONFIG_INTEL_SCU_IPC_UTIL) += intel_scu_ipcutil.o
obj-$(CONFIG_INTEL_TELEMETRY) += intel_telemetry_core.o \
intel_telemetry_pltdrv.o \
diff --git a/drivers/platform/x86/intel_scu_pltdrv.c b/drivers/platform/x86/intel_scu_pltdrv.c
new file mode 100644
index 000000000000..e9d857b44fe6
--- /dev/null
+++ b/drivers/platform/x86/intel_scu_pltdrv.c
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Platform driver for the Intel SCU.
+ *
+ * Copyright (C) 2019, Intel Corporation
+ * Authors : Divya Sasidharan <divya.s.sasidharan@xxxxxxxxx>
+ * Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
+ * Rajmohan Mani <rajmohan.mani@xxxxxxxxx>
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/intel_scu_ipc.h>
+
+static int intel_scu_platform_probe(struct platform_device *pdev)
+{
+ struct intel_scu_ipc_data scu_data = {};
+ struct intel_scu_ipc_dev *scu;
+ const struct resource *res;
+
+ scu_data.irq = platform_get_irq_optional(pdev, 0);
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENOMEM;
+
+ scu_data.mem = *res;
+
+ scu = devm_intel_scu_ipc_register(&pdev->dev, &scu_data);
+ if (IS_ERR(scu))
+ return PTR_ERR(scu);
+
+ platform_set_drvdata(pdev, scu);
+ return 0;
+}
+
+static const struct acpi_device_id intel_scu_acpi_ids[] = {
+ { "INTC1026" },
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, intel_scu_acpi_ids);
+
+static struct platform_driver intel_scu_platform_driver = {
+ .probe = intel_scu_platform_probe,
+ .driver = {
+ .name = "intel_scu",
+ .acpi_match_table = intel_scu_acpi_ids,
+ },
+};
+
+module_platform_driver(intel_scu_platform_driver);
+
+MODULE_AUTHOR("Divya Sasidharan <divya.s.sasidharan@xxxxxxxxx>");
+MODULE_AUTHOR("Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx");
+MODULE_AUTHOR("Rajmohan Mani <rajmohan.mani@xxxxxxxxx>");
+MODULE_DESCRIPTION("Intel SCU platform driver");
+MODULE_LICENSE("GPL v2");
--
2.26.2
