ACPI: add support for CSRT table (13176bbf) · Commits · 戴 / test

drivers/acpi/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -38,6 +38,7 @@ acpi-y += processor_core.o
		acpi-y += ec.o
		acpi-$(CONFIG_ACPI_DOCK) += dock.o
		acpi-y += pci_root.o pci_link.o pci_irq.o
		acpi-y += csrt.o
		acpi-y += acpi_platform.o
		acpi-y += power.o
		acpi-y += event.o

drivers/acpi/csrt.c

0 → 100644

+159 −0

Original line number	Diff line number	Diff line
		/*
		* Support for Core System Resources Table (CSRT)
		*
		* Copyright (C) 2013, Intel Corporation
		* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
		* Andy Shevchenko <andriy.shevchenko@linux.intel.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#define pr_fmt(fmt) "ACPI: CSRT: " fmt

		#include <linux/acpi.h>
		#include <linux/device.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/platform_device.h>
		#include <linux/sizes.h>

		ACPI_MODULE_NAME("CSRT");

		static int __init acpi_csrt_parse_shared_info(struct platform_device *pdev,
		const struct acpi_csrt_group *grp)
		{
		const struct acpi_csrt_shared_info *si;
		struct resource res[3];
		size_t nres;
		int ret;

		memset(res, 0, sizeof(res));
		nres = 0;

		si = (const struct acpi_csrt_shared_info *)&grp[1];
		/*
		* The peripherals that are listed on CSRT typically support only
		* 32-bit addresses so we only use the low part of MMIO base for
		* now.
		*/
		if (!si->mmio_base_high && si->mmio_base_low) {
		/*
		* There is no size of the memory resource in shared_info
		* so we assume that it is 4k here.
		*/
		res[nres].start = si->mmio_base_low;
		res[nres].end = res[0].start + SZ_4K - 1;
		res[nres++].flags = IORESOURCE_MEM;
		}

		if (si->gsi_interrupt) {
		int irq = acpi_register_gsi(NULL, si->gsi_interrupt,
		si->interrupt_mode,
		si->interrupt_polarity);
		res[nres].start = irq;
		res[nres].end = irq;
		res[nres++].flags = IORESOURCE_IRQ;
		}

		if (si->base_request_line \|\| si->num_handshake_signals) {
		/*
		* We pass the driver a DMA resource describing the range
		* of request lines the device supports.
		*/
		res[nres].start = si->base_request_line;
		res[nres].end = res[nres].start + si->num_handshake_signals - 1;
		res[nres++].flags = IORESOURCE_DMA;
		}

		ret = platform_device_add_resources(pdev, res, nres);
		if (ret) {
		if (si->gsi_interrupt)
		acpi_unregister_gsi(si->gsi_interrupt);
		return ret;
		}

		return 0;
		}

		static int __init
		acpi_csrt_parse_resource_group(const struct acpi_csrt_group *grp)
		{
		struct platform_device *pdev;
		char vendor[5], name[16];
		int ret, i;

		vendor[0] = grp->vendor_id;
		vendor[1] = grp->vendor_id >> 8;
		vendor[2] = grp->vendor_id >> 16;
		vendor[3] = grp->vendor_id >> 24;
		vendor[4] = '\0';

		if (grp->shared_info_length != sizeof(struct acpi_csrt_shared_info))
		return -ENODEV;

		snprintf(name, sizeof(name), "%s%04X", vendor, grp->device_id);
		pdev = platform_device_alloc(name, PLATFORM_DEVID_AUTO);
		if (!pdev)
		return -ENOMEM;

		/* Add resources based on the shared info */
		ret = acpi_csrt_parse_shared_info(pdev, grp);
		if (ret)
		goto fail;

		ret = platform_device_add(pdev);
		if (ret)
		goto fail;

		for (i = 0; i < pdev->num_resources; i++)
		dev_dbg(&pdev->dev, "%pR\n", &pdev->resource[i]);

		return 0;

		fail:
		platform_device_put(pdev);
		return ret;
		}

		/*
		* CSRT or Core System Resources Table is a proprietary ACPI table
		* introduced by Microsoft. This table can contain devices that are not in
		* the system DSDT table. In particular DMA controllers might be described
		* here.
		*
		* We present these devices as normal platform devices that don't have ACPI
		* IDs or handle. The platform device name will be something like
		* <VENDOR><DEVID>.<n>.auto for example: INTL9C06.0.auto.
		*/
		void __init acpi_csrt_init(void)
		{
		struct acpi_csrt_group grp, end;
		struct acpi_table_csrt *csrt;
		acpi_status status;
		int ret;

		status = acpi_get_table(ACPI_SIG_CSRT, 0,
		(struct acpi_table_header **)&csrt);
		if (ACPI_FAILURE(status)) {
		if (status != AE_NOT_FOUND)
		pr_warn("failed to get the CSRT table\n");
		return;
		}

		pr_debug("parsing CSRT table for devices\n");

		grp = (struct acpi_csrt_group *)(csrt + 1);
		end = (struct acpi_csrt_group )((void )csrt + csrt->header.length);

		while (grp < end) {
		ret = acpi_csrt_parse_resource_group(grp);
		if (ret) {
		pr_warn("error in parsing resource group: %d\n", ret);
		return;
		}

		grp = (struct acpi_csrt_group )((void )grp + grp->length);
		}
		}

drivers/acpi/internal.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@
		int init_acpi_device_notify(void);
		int acpi_scan_init(void);
		int acpi_sysfs_init(void);
		void acpi_csrt_init(void);

		#ifdef CONFIG_DEBUG_FS
		extern struct dentry *acpi_debugfs_dir;

drivers/acpi/scan.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1699,6 +1699,7 @@ int __init acpi_scan_init(void)

		acpi_power_init();
		acpi_pci_root_init();
		acpi_csrt_init();

		/*
		* Enumerate devices in the ACPI namespace.

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