Commit ee8209fd authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul

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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent f722406f
......@@ -38,7 +38,6 @@ acpi-y += processor_core.o
acpi-y += ec.o
acpi-$(CONFIG_ACPI_DOCK) += dock.o
acpi-y += pci_root.o pci_link.o pci_irq.o
acpi-y += csrt.o
acpi-$(CONFIG_X86_INTEL_LPSS) += acpi_lpss.o
acpi-y += acpi_platform.o
acpi-y += power.o
......
/*
* 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);
}
}
......@@ -35,7 +35,6 @@ void acpi_pci_link_init(void);
void acpi_pci_root_hp_init(void);
void acpi_platform_init(void);
int acpi_sysfs_init(void);
void acpi_csrt_init(void);
#ifdef CONFIG_ACPI_CONTAINER
void acpi_container_init(void);
#else
......
......@@ -2042,7 +2042,6 @@ int __init acpi_scan_init(void)
acpi_pci_link_init();
acpi_platform_init();
acpi_lpss_init();
acpi_csrt_init();
acpi_container_init();
acpi_memory_hotplug_init();
......
......@@ -4,7 +4,8 @@
* Based on of-dma.c
*
* Copyright (C) 2013, Intel Corporation
* Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
* Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
* Mika Westerberg <mika.westerberg@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
......@@ -16,12 +17,124 @@
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/acpi_dma.h>
static LIST_HEAD(acpi_dma_list);
static DEFINE_MUTEX(acpi_dma_lock);
/**
* acpi_dma_parse_resource_group - match device and parse resource group
* @grp: CSRT resource group
* @adev: ACPI device to match with
* @adma: struct acpi_dma of the given DMA controller
*
* Returns 1 on success, 0 when no information is available, or appropriate
* errno value on error.
*
* In order to match a device from DSDT table to the corresponding CSRT device
* we use MMIO address and IRQ.
*/
static int acpi_dma_parse_resource_group(const struct acpi_csrt_group *grp,
struct acpi_device *adev, struct acpi_dma *adma)
{
const struct acpi_csrt_shared_info *si;
struct list_head resource_list;
struct resource_list_entry *rentry;
resource_size_t mem = 0, irq = 0;
u32 vendor_id;
int ret;
if (grp->shared_info_length != sizeof(struct acpi_csrt_shared_info))
return -ENODEV;
INIT_LIST_HEAD(&resource_list);
ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
if (ret <= 0)
return 0;
list_for_each_entry(rentry, &resource_list, node) {
if (resource_type(&rentry->res) == IORESOURCE_MEM)
mem = rentry->res.start;
else if (resource_type(&rentry->res) == IORESOURCE_IRQ)
irq = rentry->res.start;
}
acpi_dev_free_resource_list(&resource_list);
/* Consider initial zero values as resource not found */
if (mem == 0 && irq == 0)
return 0;
si = (const struct acpi_csrt_shared_info *)&grp[1];
/* Match device by MMIO and IRQ */
if (si->mmio_base_low != mem || si->gsi_interrupt != irq)
return 0;
vendor_id = le32_to_cpu(grp->vendor_id);
dev_dbg(&adev->dev, "matches with %.4s%04X (rev %u)\n",
(char *)&vendor_id, grp->device_id, grp->revision);
/* Check if the request line range is available */
if (si->base_request_line == 0 && si->num_handshake_signals == 0)
return 0;
adma->base_request_line = si->base_request_line;
adma->end_request_line = si->base_request_line +
si->num_handshake_signals - 1;
dev_dbg(&adev->dev, "request line base: 0x%04x end: 0x%04x\n",
adma->base_request_line, adma->end_request_line);
return 1;
}
/**
* acpi_dma_parse_csrt - parse CSRT to exctract additional DMA resources
* @adev: ACPI device to match with
* @adma: struct acpi_dma of the given DMA controller
*
* 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 are using this table to get the request line range of the specific DMA
* controller to be used later.
*
*/
static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
{
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)
dev_warn(&adev->dev, "failed to get the CSRT table\n");
return;
}
grp = (struct acpi_csrt_group *)(csrt + 1);
end = (struct acpi_csrt_group *)((void *)csrt + csrt->header.length);
while (grp < end) {
ret = acpi_dma_parse_resource_group(grp, adev, adma);
if (ret < 0) {
dev_warn(&adev->dev,
"error in parsing resource group\n");
return;
}
grp = (struct acpi_csrt_group *)((void *)grp + grp->length);
}
}
/**
* acpi_dma_controller_register - Register a DMA controller to ACPI DMA helpers
* @dev: struct device of DMA controller
......@@ -61,6 +174,8 @@ int acpi_dma_controller_register(struct device *dev,
adma->acpi_dma_xlate = acpi_dma_xlate;
adma->data = data;
acpi_dma_parse_csrt(adev, adma);
/* Now queue acpi_dma controller structure in list */
mutex_lock(&acpi_dma_lock);
list_add_tail(&adma->dma_controllers, &acpi_dma_list);
......@@ -149,6 +264,45 @@ void devm_acpi_dma_controller_free(struct device *dev)
}
EXPORT_SYMBOL_GPL(devm_acpi_dma_controller_free);
/**
* acpi_dma_update_dma_spec - prepare dma specifier to pass to translation function
* @adma: struct acpi_dma of DMA controller
* @dma_spec: dma specifier to update
*
* Returns 0, if no information is avaiable, -1 on mismatch, and 1 otherwise.
*
* Accordingly to ACPI 5.0 Specification Table 6-170 "Fixed DMA Resource
* Descriptor":
* DMA Request Line bits is a platform-relative number uniquely
* identifying the request line assigned. Request line-to-Controller
* mapping is done in a controller-specific OS driver.
* That's why we can safely adjust slave_id when the appropriate controller is
* found.
*/
static int acpi_dma_update_dma_spec(struct acpi_dma *adma,
struct acpi_dma_spec *dma_spec)
{
/* Set link to the DMA controller device */
dma_spec->dev = adma->dev;
/* Check if the request line range is available */
if (adma->base_request_line == 0 && adma->end_request_line == 0)
return 0;
/* Check if slave_id falls to the range */
if (dma_spec->slave_id < adma->base_request_line ||
dma_spec->slave_id > adma->end_request_line)
return -1;
/*
* Here we adjust slave_id. It should be a relative number to the base
* request line.
*/
dma_spec->slave_id -= adma->base_request_line;
return 1;
}
struct acpi_dma_parser_data {
struct acpi_dma_spec dma_spec;
size_t index;
......@@ -193,6 +347,7 @@ struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
struct acpi_device *adev;
struct acpi_dma *adma;
struct dma_chan *chan = NULL;
int found;
/* Check if the device was enumerated by ACPI */
if (!dev || !ACPI_HANDLE(dev))
......@@ -219,9 +374,20 @@ struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
mutex_lock(&acpi_dma_lock);
list_for_each_entry(adma, &acpi_dma_list, dma_controllers) {
dma_spec->dev = adma->dev;
/*
* We are not going to call translation function if slave_id
* doesn't fall to the request range.
*/
found = acpi_dma_update_dma_spec(adma, dma_spec);
if (found < 0)
continue;
chan = adma->acpi_dma_xlate(dma_spec, adma);
if (chan)
/*
* Try to get a channel only from the DMA controller that
* matches the slave_id. See acpi_dma_update_dma_spec()
* description for the details.
*/
if (found > 0 || chan)
break;
}
......
......@@ -37,6 +37,8 @@ struct acpi_dma_spec {
* @dev: struct device of this controller
* @acpi_dma_xlate: callback function to find a suitable channel
* @data: private data used by a callback function
* @base_request_line: first supported request line (CSRT)
* @end_request_line: last supported request line (CSRT)
*/
struct acpi_dma {
struct list_head dma_controllers;
......@@ -44,6 +46,8 @@ struct acpi_dma {
struct dma_chan *(*acpi_dma_xlate)
(struct acpi_dma_spec *, struct acpi_dma *);
void *data;
unsigned short base_request_line;
unsigned short end_request_line;
};
/* Used with acpi_dma_simple_xlate() */
......
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