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author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2017-08-23 09:59:55 +0300 |
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committer | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2018-03-28 18:47:23 +0300 |
commit | ebc57e399b8efb68293f206333985a3394c3acf8 (patch) | |
tree | 8a4a2cba6c6aeb166baeffb9bfd844b523487fd4 | |
parent | 282ffec565c2e9fe18bbb48c19767cccd2437f11 (diff) | |
download | linux-ebc57e399b8efb68293f206333985a3394c3acf8.tar.gz linux-ebc57e399b8efb68293f206333985a3394c3acf8.tar.xz |
intel_th: Add ACPI glue layer
The Trace Hub devices now can be enumerated as ACPI devices, which
translates into "Host Debugger mode". There are two IDs: one for
PCH Trace Hub, and one for the uncore Trace Hub. These are expected
to stay the same across all platforms.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
-rw-r--r-- | drivers/hwtracing/intel_th/Kconfig | 12 | ||||
-rw-r--r-- | drivers/hwtracing/intel_th/Makefile | 3 | ||||
-rw-r--r-- | drivers/hwtracing/intel_th/acpi.c | 79 |
3 files changed, 94 insertions, 0 deletions
diff --git a/drivers/hwtracing/intel_th/Kconfig b/drivers/hwtracing/intel_th/Kconfig index 1b412f8a56b5..ca0527d588e9 100644 --- a/drivers/hwtracing/intel_th/Kconfig +++ b/drivers/hwtracing/intel_th/Kconfig @@ -25,6 +25,18 @@ config INTEL_TH_PCI Say Y here to enable PCI Intel TH support. +config INTEL_TH_ACPI + tristate "Intel(R) Trace Hub ACPI controller" + depends on ACPI + help + Intel(R) Trace Hub may exist as an ACPI device. This option enables + support glue layer for ACPI-based Intel TH. This typically implies + 'host debugger' mode, that is, the trace configuration and capture + is handled by an external debug host and corresponding controls will + not be available on the target. + + Say Y here to enable ACPI Intel TH support. + config INTEL_TH_GTH tristate "Intel(R) Trace Hub Global Trace Hub" help diff --git a/drivers/hwtracing/intel_th/Makefile b/drivers/hwtracing/intel_th/Makefile index 880c9b5e8566..d9252fa8d9ca 100644 --- a/drivers/hwtracing/intel_th/Makefile +++ b/drivers/hwtracing/intel_th/Makefile @@ -6,6 +6,9 @@ intel_th-$(CONFIG_INTEL_TH_DEBUG) += debug.o obj-$(CONFIG_INTEL_TH_PCI) += intel_th_pci.o intel_th_pci-y := pci.o +obj-$(CONFIG_INTEL_TH_ACPI) += intel_th_acpi.o +intel_th_acpi-y := acpi.o + obj-$(CONFIG_INTEL_TH_GTH) += intel_th_gth.o intel_th_gth-y := gth.o diff --git a/drivers/hwtracing/intel_th/acpi.c b/drivers/hwtracing/intel_th/acpi.c new file mode 100644 index 000000000000..87bc3744755f --- /dev/null +++ b/drivers/hwtracing/intel_th/acpi.c @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel(R) Trace Hub ACPI driver + * + * Copyright (C) 2017 Intel Corporation. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/types.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/sysfs.h> +#include <linux/platform_device.h> +#include <linux/acpi.h> + +#include "intel_th.h" + +#define DRIVER_NAME "intel_th_acpi" + +static const struct intel_th_drvdata intel_th_acpi_pch = { + .host_mode_only = 1, +}; + +static const struct intel_th_drvdata intel_th_acpi_uncore = { + .host_mode_only = 1, +}; + +static const struct acpi_device_id intel_th_acpi_ids[] = { + { "INTC1000", (kernel_ulong_t)&intel_th_acpi_uncore }, + { "INTC1001", (kernel_ulong_t)&intel_th_acpi_pch }, + { "", 0 }, +}; + +MODULE_DEVICE_TABLE(acpi, intel_th_acpi_ids); + +static int intel_th_acpi_probe(struct platform_device *pdev) +{ + struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); + const struct acpi_device_id *id; + struct intel_th *th; + + id = acpi_match_device(intel_th_acpi_ids, &pdev->dev); + if (!id) + return -ENODEV; + + th = intel_th_alloc(&pdev->dev, (void *)id->driver_data, + pdev->resource, pdev->num_resources, -1); + if (IS_ERR(th)) + return PTR_ERR(th); + + adev->driver_data = th; + + return 0; +} + +static int intel_th_acpi_remove(struct platform_device *pdev) +{ + struct intel_th *th = platform_get_drvdata(pdev); + + intel_th_free(th); + + return 0; +} + +static struct platform_driver intel_th_acpi_driver = { + .probe = intel_th_acpi_probe, + .remove = intel_th_acpi_remove, + .driver = { + .name = DRIVER_NAME, + .acpi_match_table = intel_th_acpi_ids, + }, +}; + +module_platform_driver(intel_th_acpi_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Intel(R) Trace Hub ACPI controller driver"); +MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>"); |