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platform/x86: Add Elkhart Lake SCU/PMC support

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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@intel.com>
Signed-off-by: Divya Sasidharan <divya.s.sasidharan@intel.com>
Co-developed-by: Rajmohan Mani <rajmohan.mani@intel.com>
Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Mika Westerberg 2020-04-28 11:51:12 +03:00 committed by Andy Shevchenko
parent b991178fe3
commit 7a61f05e94
3 changed files with 70 additions and 0 deletions
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9
drivers/platform/x86/Kconfig
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@ -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

1
drivers/platform/x86/Makefile
View File

@ -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 \

60
drivers/platform/x86/intel_scu_pltdrv.c Normal file
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@ -0,0 +1,60 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Platform driver for the Intel SCU.
*
* Copyright (C) 2019, Intel Corporation
* Authors: Divya Sasidharan <divya.s.sasidharan@intel.com>
* Mika Westerberg <mika.westerberg@linux.intel.com>
* Rajmohan Mani <rajmohan.mani@intel.com>
*/
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/mod_devicetable.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@intel.com>");
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com");
MODULE_AUTHOR("Rajmohan Mani <rajmohan.mani@intel.com>");
MODULE_DESCRIPTION("Intel SCU platform driver");
MODULE_LICENSE("GPL v2");