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dma: acpi-dma: parse CSRT to extract additional resources
Since we have CSRT only to get additional DMA controller resources, let's get rid of drivers/acpi/csrt.c and move its logic inside ACPI DMA helpers code. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andy Shevchenko
Vinod Koul
parent
f722406faa
commit
ee8209fd02
@ -38,7 +38,6 @@ acpi-y += processor_core.o
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acpi-y += ec.o
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acpi-$(CONFIG_ACPI_DOCK) += dock.o
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acpi-y += pci_root.o pci_link.o pci_irq.o
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acpi-y += csrt.o
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acpi-$(CONFIG_X86_INTEL_LPSS) += acpi_lpss.o
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acpi-y += acpi_platform.o
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acpi-y += power.o
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@ -1,159 +0,0 @@
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/*
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* Support for Core System Resources Table (CSRT)
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*
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* Copyright (C) 2013, Intel Corporation
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* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
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* Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) "ACPI: CSRT: " fmt
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/sizes.h>
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ACPI_MODULE_NAME("CSRT");
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static int __init acpi_csrt_parse_shared_info(struct platform_device *pdev,
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const struct acpi_csrt_group *grp)
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{
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const struct acpi_csrt_shared_info *si;
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struct resource res[3];
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size_t nres;
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int ret;
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memset(res, 0, sizeof(res));
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nres = 0;
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si = (const struct acpi_csrt_shared_info *)&grp[1];
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/*
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* The peripherals that are listed on CSRT typically support only
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* 32-bit addresses so we only use the low part of MMIO base for
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* now.
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*/
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if (!si->mmio_base_high && si->mmio_base_low) {
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/*
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* There is no size of the memory resource in shared_info
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* so we assume that it is 4k here.
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*/
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res[nres].start = si->mmio_base_low;
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res[nres].end = res[0].start + SZ_4K - 1;
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res[nres++].flags = IORESOURCE_MEM;
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}
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if (si->gsi_interrupt) {
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int irq = acpi_register_gsi(NULL, si->gsi_interrupt,
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si->interrupt_mode,
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si->interrupt_polarity);
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res[nres].start = irq;
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res[nres].end = irq;
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res[nres++].flags = IORESOURCE_IRQ;
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}
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if (si->base_request_line || si->num_handshake_signals) {
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/*
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* We pass the driver a DMA resource describing the range
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* of request lines the device supports.
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*/
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res[nres].start = si->base_request_line;
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res[nres].end = res[nres].start + si->num_handshake_signals - 1;
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res[nres++].flags = IORESOURCE_DMA;
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}
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ret = platform_device_add_resources(pdev, res, nres);
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if (ret) {
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if (si->gsi_interrupt)
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acpi_unregister_gsi(si->gsi_interrupt);
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return ret;
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}
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return 0;
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}
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static int __init
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acpi_csrt_parse_resource_group(const struct acpi_csrt_group *grp)
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{
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struct platform_device *pdev;
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char vendor[5], name[16];
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int ret, i;
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vendor[0] = grp->vendor_id;
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vendor[1] = grp->vendor_id >> 8;
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vendor[2] = grp->vendor_id >> 16;
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vendor[3] = grp->vendor_id >> 24;
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vendor[4] = '\0';
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if (grp->shared_info_length != sizeof(struct acpi_csrt_shared_info))
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return -ENODEV;
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snprintf(name, sizeof(name), "%s%04X", vendor, grp->device_id);
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pdev = platform_device_alloc(name, PLATFORM_DEVID_AUTO);
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if (!pdev)
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return -ENOMEM;
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/* Add resources based on the shared info */
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ret = acpi_csrt_parse_shared_info(pdev, grp);
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if (ret)
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goto fail;
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ret = platform_device_add(pdev);
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if (ret)
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goto fail;
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for (i = 0; i < pdev->num_resources; i++)
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dev_dbg(&pdev->dev, "%pR\n", &pdev->resource[i]);
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return 0;
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fail:
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platform_device_put(pdev);
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return ret;
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}
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/*
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* CSRT or Core System Resources Table is a proprietary ACPI table
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* introduced by Microsoft. This table can contain devices that are not in
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* the system DSDT table. In particular DMA controllers might be described
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* here.
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*
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* We present these devices as normal platform devices that don't have ACPI
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* IDs or handle. The platform device name will be something like
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* <VENDOR><DEVID>.<n>.auto for example: INTL9C06.0.auto.
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*/
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void __init acpi_csrt_init(void)
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{
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struct acpi_csrt_group *grp, *end;
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struct acpi_table_csrt *csrt;
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acpi_status status;
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int ret;
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status = acpi_get_table(ACPI_SIG_CSRT, 0,
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(struct acpi_table_header **)&csrt);
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if (ACPI_FAILURE(status)) {
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if (status != AE_NOT_FOUND)
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pr_warn("failed to get the CSRT table\n");
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return;
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}
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pr_debug("parsing CSRT table for devices\n");
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grp = (struct acpi_csrt_group *)(csrt + 1);
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end = (struct acpi_csrt_group *)((void *)csrt + csrt->header.length);
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while (grp < end) {
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ret = acpi_csrt_parse_resource_group(grp);
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if (ret) {
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pr_warn("error in parsing resource group: %d\n", ret);
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return;
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}
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grp = (struct acpi_csrt_group *)((void *)grp + grp->length);
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}
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}
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@ -35,7 +35,6 @@ void acpi_pci_link_init(void);
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void acpi_pci_root_hp_init(void);
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void acpi_platform_init(void);
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int acpi_sysfs_init(void);
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void acpi_csrt_init(void);
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#ifdef CONFIG_ACPI_CONTAINER
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void acpi_container_init(void);
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#else
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@ -2042,7 +2042,6 @@ int __init acpi_scan_init(void)
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acpi_pci_link_init();
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acpi_platform_init();
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acpi_lpss_init();
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acpi_csrt_init();
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acpi_container_init();
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acpi_memory_hotplug_init();
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@ -4,7 +4,8 @@
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* Based on of-dma.c
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*
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* Copyright (C) 2013, Intel Corporation
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* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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* Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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* Mika Westerberg <mika.westerberg@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -16,12 +17,124 @@
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/acpi.h>
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#include <linux/acpi_dma.h>
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static LIST_HEAD(acpi_dma_list);
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static DEFINE_MUTEX(acpi_dma_lock);
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/**
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* acpi_dma_parse_resource_group - match device and parse resource group
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* @grp: CSRT resource group
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* @adev: ACPI device to match with
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* @adma: struct acpi_dma of the given DMA controller
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*
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* Returns 1 on success, 0 when no information is available, or appropriate
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* errno value on error.
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*
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* In order to match a device from DSDT table to the corresponding CSRT device
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* we use MMIO address and IRQ.
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*/
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static int acpi_dma_parse_resource_group(const struct acpi_csrt_group *grp,
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struct acpi_device *adev, struct acpi_dma *adma)
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{
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const struct acpi_csrt_shared_info *si;
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struct list_head resource_list;
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struct resource_list_entry *rentry;
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resource_size_t mem = 0, irq = 0;
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u32 vendor_id;
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int ret;
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if (grp->shared_info_length != sizeof(struct acpi_csrt_shared_info))
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return -ENODEV;
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INIT_LIST_HEAD(&resource_list);
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ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
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if (ret <= 0)
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return 0;
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list_for_each_entry(rentry, &resource_list, node) {
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if (resource_type(&rentry->res) == IORESOURCE_MEM)
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mem = rentry->res.start;
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else if (resource_type(&rentry->res) == IORESOURCE_IRQ)
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irq = rentry->res.start;
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}
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acpi_dev_free_resource_list(&resource_list);
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/* Consider initial zero values as resource not found */
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if (mem == 0 && irq == 0)
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return 0;
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si = (const struct acpi_csrt_shared_info *)&grp[1];
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/* Match device by MMIO and IRQ */
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if (si->mmio_base_low != mem || si->gsi_interrupt != irq)
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return 0;
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vendor_id = le32_to_cpu(grp->vendor_id);
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dev_dbg(&adev->dev, "matches with %.4s%04X (rev %u)\n",
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(char *)&vendor_id, grp->device_id, grp->revision);
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/* Check if the request line range is available */
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if (si->base_request_line == 0 && si->num_handshake_signals == 0)
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return 0;
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adma->base_request_line = si->base_request_line;
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adma->end_request_line = si->base_request_line +
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si->num_handshake_signals - 1;
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dev_dbg(&adev->dev, "request line base: 0x%04x end: 0x%04x\n",
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adma->base_request_line, adma->end_request_line);
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return 1;
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}
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/**
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* acpi_dma_parse_csrt - parse CSRT to exctract additional DMA resources
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* @adev: ACPI device to match with
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* @adma: struct acpi_dma of the given DMA controller
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*
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* CSRT or Core System Resources Table is a proprietary ACPI table
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* introduced by Microsoft. This table can contain devices that are not in
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* the system DSDT table. In particular DMA controllers might be described
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* here.
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*
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* We are using this table to get the request line range of the specific DMA
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* controller to be used later.
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*
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*/
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static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
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{
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struct acpi_csrt_group *grp, *end;
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struct acpi_table_csrt *csrt;
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acpi_status status;
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int ret;
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status = acpi_get_table(ACPI_SIG_CSRT, 0,
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(struct acpi_table_header **)&csrt);
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if (ACPI_FAILURE(status)) {
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if (status != AE_NOT_FOUND)
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dev_warn(&adev->dev, "failed to get the CSRT table\n");
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return;
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}
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grp = (struct acpi_csrt_group *)(csrt + 1);
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end = (struct acpi_csrt_group *)((void *)csrt + csrt->header.length);
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while (grp < end) {
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ret = acpi_dma_parse_resource_group(grp, adev, adma);
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if (ret < 0) {
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dev_warn(&adev->dev,
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"error in parsing resource group\n");
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return;
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}
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grp = (struct acpi_csrt_group *)((void *)grp + grp->length);
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}
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}
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/**
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* acpi_dma_controller_register - Register a DMA controller to ACPI DMA helpers
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* @dev: struct device of DMA controller
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@ -61,6 +174,8 @@ int acpi_dma_controller_register(struct device *dev,
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adma->acpi_dma_xlate = acpi_dma_xlate;
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adma->data = data;
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acpi_dma_parse_csrt(adev, adma);
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/* Now queue acpi_dma controller structure in list */
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mutex_lock(&acpi_dma_lock);
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list_add_tail(&adma->dma_controllers, &acpi_dma_list);
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@ -149,6 +264,45 @@ void devm_acpi_dma_controller_free(struct device *dev)
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}
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EXPORT_SYMBOL_GPL(devm_acpi_dma_controller_free);
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/**
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* acpi_dma_update_dma_spec - prepare dma specifier to pass to translation function
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* @adma: struct acpi_dma of DMA controller
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* @dma_spec: dma specifier to update
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*
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* Returns 0, if no information is avaiable, -1 on mismatch, and 1 otherwise.
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*
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* Accordingly to ACPI 5.0 Specification Table 6-170 "Fixed DMA Resource
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* Descriptor":
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* DMA Request Line bits is a platform-relative number uniquely
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* identifying the request line assigned. Request line-to-Controller
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* mapping is done in a controller-specific OS driver.
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* That's why we can safely adjust slave_id when the appropriate controller is
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* found.
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*/
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static int acpi_dma_update_dma_spec(struct acpi_dma *adma,
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struct acpi_dma_spec *dma_spec)
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{
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/* Set link to the DMA controller device */
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dma_spec->dev = adma->dev;
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/* Check if the request line range is available */
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if (adma->base_request_line == 0 && adma->end_request_line == 0)
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return 0;
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/* Check if slave_id falls to the range */
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if (dma_spec->slave_id < adma->base_request_line ||
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dma_spec->slave_id > adma->end_request_line)
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return -1;
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/*
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* Here we adjust slave_id. It should be a relative number to the base
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* request line.
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*/
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dma_spec->slave_id -= adma->base_request_line;
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return 1;
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}
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struct acpi_dma_parser_data {
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struct acpi_dma_spec dma_spec;
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size_t index;
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@ -193,6 +347,7 @@ struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
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struct acpi_device *adev;
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struct acpi_dma *adma;
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struct dma_chan *chan = NULL;
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int found;
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/* Check if the device was enumerated by ACPI */
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if (!dev || !ACPI_HANDLE(dev))
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@ -219,9 +374,20 @@ struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
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mutex_lock(&acpi_dma_lock);
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list_for_each_entry(adma, &acpi_dma_list, dma_controllers) {
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dma_spec->dev = adma->dev;
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/*
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* We are not going to call translation function if slave_id
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* doesn't fall to the request range.
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*/
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found = acpi_dma_update_dma_spec(adma, dma_spec);
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if (found < 0)
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continue;
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chan = adma->acpi_dma_xlate(dma_spec, adma);
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if (chan)
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/*
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* Try to get a channel only from the DMA controller that
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* matches the slave_id. See acpi_dma_update_dma_spec()
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* description for the details.
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*/
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if (found > 0 || chan)
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break;
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}
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@ -37,6 +37,8 @@ struct acpi_dma_spec {
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* @dev: struct device of this controller
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* @acpi_dma_xlate: callback function to find a suitable channel
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* @data: private data used by a callback function
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* @base_request_line: first supported request line (CSRT)
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* @end_request_line: last supported request line (CSRT)
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*/
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struct acpi_dma {
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struct list_head dma_controllers;
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@ -44,6 +46,8 @@ struct acpi_dma {
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struct dma_chan *(*acpi_dma_xlate)
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(struct acpi_dma_spec *, struct acpi_dma *);
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void *data;
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unsigned short base_request_line;
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unsigned short end_request_line;
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};
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/* Used with acpi_dma_simple_xlate() */
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