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linux/drivers/ide/ide-acpi.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

623 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* Provides ACPI support for IDE drives.
*
* Copyright (C) 2005 Intel Corp.
* Copyright (C) 2005 Randy Dunlap
* Copyright (C) 2006 SUSE Linux Products GmbH
* Copyright (C) 2006 Hannes Reinecke
*/
#include <linux/acpi.h>
#include <linux/ata.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/ide.h>
#include <linux/pci.h>
#include <linux/dmi.h>
#include <linux/module.h>
#define REGS_PER_GTF 7
struct GTM_buffer {
u32 PIO_speed0;
u32 DMA_speed0;
u32 PIO_speed1;
u32 DMA_speed1;
u32 GTM_flags;
};
struct ide_acpi_drive_link {
acpi_handle obj_handle;
u8 idbuff[512];
};
struct ide_acpi_hwif_link {
ide_hwif_t *hwif;
acpi_handle obj_handle;
struct GTM_buffer gtm;
struct ide_acpi_drive_link master;
struct ide_acpi_drive_link slave;
};
#undef DEBUGGING
/* note: adds function name and KERN_DEBUG */
#ifdef DEBUGGING
#define DEBPRINT(fmt, args...) \
printk(KERN_DEBUG "%s: " fmt, __func__, ## args)
#else
#define DEBPRINT(fmt, args...) do {} while (0)
#endif /* DEBUGGING */
static bool ide_noacpi;
module_param_named(noacpi, ide_noacpi, bool, 0);
MODULE_PARM_DESC(noacpi, "disable IDE ACPI support");
static bool ide_acpigtf;
module_param_named(acpigtf, ide_acpigtf, bool, 0);
MODULE_PARM_DESC(acpigtf, "enable IDE ACPI _GTF support");
static bool ide_acpionboot;
module_param_named(acpionboot, ide_acpionboot, bool, 0);
MODULE_PARM_DESC(acpionboot, "call IDE ACPI methods on boot");
static bool ide_noacpi_psx;
static int no_acpi_psx(const struct dmi_system_id *id)
{
ide_noacpi_psx = true;
printk(KERN_NOTICE"%s detected - disable ACPI _PSx.\n", id->ident);
return 0;
}
static const struct dmi_system_id ide_acpi_dmi_table[] = {
/* Bug 9673. */
/* We should check if this is because ACPI NVS isn't save/restored. */
{
.callback = no_acpi_psx,
.ident = "HP nx9005",
.matches = {
DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies Ltd."),
DMI_MATCH(DMI_BIOS_VERSION, "KAM1.60")
},
},
{ } /* terminate list */
};
int ide_acpi_init(void)
{
dmi_check_system(ide_acpi_dmi_table);
return 0;
}
bool ide_port_acpi(ide_hwif_t *hwif)
{
return ide_noacpi == 0 && hwif->acpidata;
}
static acpi_handle acpi_get_child(acpi_handle handle, u64 addr)
{
struct acpi_device *adev;
if (!handle || acpi_bus_get_device(handle, &adev))
return NULL;
adev = acpi_find_child_device(adev, addr, false);
return adev ? adev->handle : NULL;
}
/**
* ide_get_dev_handle - finds acpi_handle and PCI device.function
* @dev: device to locate
* @handle: returned acpi_handle for @dev
* @pcidevfn: return PCI device.func for @dev
*
* Returns the ACPI object handle to the corresponding PCI device.
*
* Returns 0 on success, <0 on error.
*/
static int ide_get_dev_handle(struct device *dev, acpi_handle *handle,
u64 *pcidevfn)
{
struct pci_dev *pdev = to_pci_dev(dev);
unsigned int bus, devnum, func;
u64 addr;
acpi_handle dev_handle;
acpi_status status;
struct acpi_device_info *dinfo = NULL;
int ret = -ENODEV;
bus = pdev->bus->number;
devnum = PCI_SLOT(pdev->devfn);
func = PCI_FUNC(pdev->devfn);
/* ACPI _ADR encoding for PCI bus: */
addr = (u64)(devnum << 16 | func);
DEBPRINT("ENTER: pci %02x:%02x.%01x\n", bus, devnum, func);
dev_handle = ACPI_HANDLE(dev);
if (!dev_handle) {
DEBPRINT("no acpi handle for device\n");
goto err;
}
status = acpi_get_object_info(dev_handle, &dinfo);
if (ACPI_FAILURE(status)) {
DEBPRINT("get_object_info for device failed\n");
goto err;
}
if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
dinfo->address == addr) {
*pcidevfn = addr;
*handle = dev_handle;
} else {
DEBPRINT("get_object_info for device has wrong "
" address: %llu, should be %u\n",
dinfo ? (unsigned long long)dinfo->address : -1ULL,
(unsigned int)addr);
goto err;
}
DEBPRINT("for dev=0x%x.%x, addr=0x%llx, *handle=0x%p\n",
devnum, func, (unsigned long long)addr, *handle);
ret = 0;
err:
kfree(dinfo);
return ret;
}
/**
* ide_acpi_hwif_get_handle - Get ACPI object handle for a given hwif
* @hwif: device to locate
*
* Retrieves the object handle for a given hwif.
*
* Returns handle on success, 0 on error.
*/
static acpi_handle ide_acpi_hwif_get_handle(ide_hwif_t *hwif)
{
struct device *dev = hwif->gendev.parent;
acpi_handle uninitialized_var(dev_handle);
u64 pcidevfn;
acpi_handle chan_handle;
int err;
DEBPRINT("ENTER: device %s\n", hwif->name);
if (!dev) {
DEBPRINT("no PCI device for %s\n", hwif->name);
return NULL;
}
err = ide_get_dev_handle(dev, &dev_handle, &pcidevfn);
if (err < 0) {
DEBPRINT("ide_get_dev_handle failed (%d)\n", err);
return NULL;
}
/* get child objects of dev_handle == channel objects,
* + _their_ children == drive objects */
/* channel is hwif->channel */
chan_handle = acpi_get_child(dev_handle, hwif->channel);
DEBPRINT("chan adr=%d: handle=0x%p\n",
hwif->channel, chan_handle);
return chan_handle;
}
/**
* do_drive_get_GTF - get the drive bootup default taskfile settings
* @drive: the drive for which the taskfile settings should be retrieved
* @gtf_length: number of bytes of _GTF data returned at @gtf_address
* @gtf_address: buffer containing _GTF taskfile arrays
*
* The _GTF method has no input parameters.
* It returns a variable number of register set values (registers
* hex 1F1..1F7, taskfiles).
* The <variable number> is not known in advance, so have ACPI-CA
* allocate the buffer as needed and return it, then free it later.
*
* The returned @gtf_length and @gtf_address are only valid if the
* function return value is 0.
*/
static int do_drive_get_GTF(ide_drive_t *drive,
unsigned int *gtf_length, unsigned long *gtf_address,
unsigned long *obj_loc)
{
acpi_status status;
struct acpi_buffer output;
union acpi_object *out_obj;
int err = -ENODEV;
*gtf_length = 0;
*gtf_address = 0UL;
*obj_loc = 0UL;
if (!drive->acpidata->obj_handle) {
DEBPRINT("No ACPI object found for %s\n", drive->name);
goto out;
}
/* Setting up output buffer */
output.length = ACPI_ALLOCATE_BUFFER;
output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
/* _GTF has no input parameters */
err = -EIO;
status = acpi_evaluate_object(drive->acpidata->obj_handle, "_GTF",
NULL, &output);
if (ACPI_FAILURE(status)) {
printk(KERN_DEBUG
"%s: Run _GTF error: status = 0x%x\n",
__func__, status);
goto out;
}
if (!output.length || !output.pointer) {
DEBPRINT("Run _GTF: "
"length or ptr is NULL (0x%llx, 0x%p)\n",
(unsigned long long)output.length,
output.pointer);
goto out;
}
out_obj = output.pointer;
if (out_obj->type != ACPI_TYPE_BUFFER) {
DEBPRINT("Run _GTF: error: "
"expected object type of ACPI_TYPE_BUFFER, "
"got 0x%x\n", out_obj->type);
err = -ENOENT;
kfree(output.pointer);
goto out;
}
if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
out_obj->buffer.length % REGS_PER_GTF) {
printk(KERN_ERR
"%s: unexpected GTF length (%d) or addr (0x%p)\n",
__func__, out_obj->buffer.length,
out_obj->buffer.pointer);
err = -ENOENT;
kfree(output.pointer);
goto out;
}
*gtf_length = out_obj->buffer.length;
*gtf_address = (unsigned long)out_obj->buffer.pointer;
*obj_loc = (unsigned long)out_obj;
DEBPRINT("returning gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
*gtf_length, *gtf_address, *obj_loc);
err = 0;
out:
return err;
}
/**
* do_drive_set_taskfiles - write the drive taskfile settings from _GTF
* @drive: the drive to which the taskfile command should be sent
* @gtf_length: total number of bytes of _GTF taskfiles
* @gtf_address: location of _GTF taskfile arrays
*
* Write {gtf_address, length gtf_length} in groups of
* REGS_PER_GTF bytes.
*/
static int do_drive_set_taskfiles(ide_drive_t *drive,
unsigned int gtf_length,
unsigned long gtf_address)
{
int rc = 0, err;
int gtf_count = gtf_length / REGS_PER_GTF;
int ix;
DEBPRINT("total GTF bytes=%u (0x%x), gtf_count=%d, addr=0x%lx\n",
gtf_length, gtf_length, gtf_count, gtf_address);
/* send all taskfile registers (0x1f1-0x1f7) *in*that*order* */
for (ix = 0; ix < gtf_count; ix++) {
u8 *gtf = (u8 *)(gtf_address + ix * REGS_PER_GTF);
struct ide_cmd cmd;
DEBPRINT("(0x1f1-1f7): "
"hex: %02x %02x %02x %02x %02x %02x %02x\n",
gtf[0], gtf[1], gtf[2],
gtf[3], gtf[4], gtf[5], gtf[6]);
if (!ide_acpigtf) {
DEBPRINT("_GTF execution disabled\n");
continue;
}
/* convert GTF to taskfile */
memset(&cmd, 0, sizeof(cmd));
memcpy(&cmd.tf.feature, gtf, REGS_PER_GTF);
cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
err = ide_no_data_taskfile(drive, &cmd);
if (err) {
printk(KERN_ERR "%s: ide_no_data_taskfile failed: %u\n",
__func__, err);
rc = err;
}
}
return rc;
}
/**
* ide_acpi_exec_tfs - get then write drive taskfile settings
* @drive: the drive for which the taskfile settings should be
* written.
*
* According to the ACPI spec this should be called after _STM
* has been evaluated for the interface. Some ACPI vendors interpret
* that as a hard requirement and modify the taskfile according
* to the Identify Drive information passed down with _STM.
* So one should really make sure to call this only after _STM has
* been executed.
*/
int ide_acpi_exec_tfs(ide_drive_t *drive)
{
int ret;
unsigned int gtf_length;
unsigned long gtf_address;
unsigned long obj_loc;
DEBPRINT("call get_GTF, drive=%s port=%d\n", drive->name, drive->dn);
ret = do_drive_get_GTF(drive, &gtf_length, &gtf_address, &obj_loc);
if (ret < 0) {
DEBPRINT("get_GTF error (%d)\n", ret);
return ret;
}
DEBPRINT("call set_taskfiles, drive=%s\n", drive->name);
ret = do_drive_set_taskfiles(drive, gtf_length, gtf_address);
kfree((void *)obj_loc);
if (ret < 0) {
DEBPRINT("set_taskfiles error (%d)\n", ret);
}
DEBPRINT("ret=%d\n", ret);
return ret;
}
/**
* ide_acpi_get_timing - get the channel (controller) timings
* @hwif: target IDE interface (channel)
*
* This function executes the _GTM ACPI method for the target channel.
*
*/
void ide_acpi_get_timing(ide_hwif_t *hwif)
{
acpi_status status;
struct acpi_buffer output;
union acpi_object *out_obj;
/* Setting up output buffer for _GTM */
output.length = ACPI_ALLOCATE_BUFFER;
output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
/* _GTM has no input parameters */
status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_GTM",
NULL, &output);
DEBPRINT("_GTM status: %d, outptr: 0x%p, outlen: 0x%llx\n",
status, output.pointer,
(unsigned long long)output.length);
if (ACPI_FAILURE(status)) {
DEBPRINT("Run _GTM error: status = 0x%x\n", status);
return;
}
if (!output.length || !output.pointer) {
DEBPRINT("Run _GTM: length or ptr is NULL (0x%llx, 0x%p)\n",
(unsigned long long)output.length,
output.pointer);
kfree(output.pointer);
return;
}
out_obj = output.pointer;
if (out_obj->type != ACPI_TYPE_BUFFER) {
DEBPRINT("Run _GTM: error: "
"expected object type of ACPI_TYPE_BUFFER, "
"got 0x%x\n", out_obj->type);
kfree(output.pointer);
return;
}
if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
out_obj->buffer.length != sizeof(struct GTM_buffer)) {
printk(KERN_ERR
"%s: unexpected _GTM length (0x%x)[should be 0x%zx] or "
"addr (0x%p)\n",
__func__, out_obj->buffer.length,
sizeof(struct GTM_buffer), out_obj->buffer.pointer);
kfree(output.pointer);
return;
}
memcpy(&hwif->acpidata->gtm, out_obj->buffer.pointer,
sizeof(struct GTM_buffer));
DEBPRINT("_GTM info: ptr: 0x%p, len: 0x%x, exp.len: 0x%zx\n",
out_obj->buffer.pointer, out_obj->buffer.length,
sizeof(struct GTM_buffer));
DEBPRINT("_GTM fields: 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n",
hwif->acpidata->gtm.PIO_speed0,
hwif->acpidata->gtm.DMA_speed0,
hwif->acpidata->gtm.PIO_speed1,
hwif->acpidata->gtm.DMA_speed1,
hwif->acpidata->gtm.GTM_flags);
kfree(output.pointer);
}
/**
* ide_acpi_push_timing - set the channel (controller) timings
* @hwif: target IDE interface (channel)
*
* This function executes the _STM ACPI method for the target channel.
*
* _STM requires Identify Drive data, which has to passed as an argument.
* Unfortunately drive->id is a mangled version which we can't readily
* use; hence we'll get the information afresh.
*/
void ide_acpi_push_timing(ide_hwif_t *hwif)
{
acpi_status status;
struct acpi_object_list input;
union acpi_object in_params[3];
struct ide_acpi_drive_link *master = &hwif->acpidata->master;
struct ide_acpi_drive_link *slave = &hwif->acpidata->slave;
/* Give the GTM buffer + drive Identify data to the channel via the
* _STM method: */
/* setup input parameters buffer for _STM */
input.count = 3;
input.pointer = in_params;
in_params[0].type = ACPI_TYPE_BUFFER;
in_params[0].buffer.length = sizeof(struct GTM_buffer);
in_params[0].buffer.pointer = (u8 *)&hwif->acpidata->gtm;
in_params[1].type = ACPI_TYPE_BUFFER;
in_params[1].buffer.length = ATA_ID_WORDS * 2;
in_params[1].buffer.pointer = (u8 *)&master->idbuff;
in_params[2].type = ACPI_TYPE_BUFFER;
in_params[2].buffer.length = ATA_ID_WORDS * 2;
in_params[2].buffer.pointer = (u8 *)&slave->idbuff;
/* Output buffer: _STM has no output */
status = acpi_evaluate_object(hwif->acpidata->obj_handle, "_STM",
&input, NULL);
if (ACPI_FAILURE(status)) {
DEBPRINT("Run _STM error: status = 0x%x\n", status);
}
DEBPRINT("_STM status: %d\n", status);
}
/**
* ide_acpi_set_state - set the channel power state
* @hwif: target IDE interface
* @on: state, on/off
*
* This function executes the _PS0/_PS3 ACPI method to set the power state.
* ACPI spec requires _PS0 when IDE power on and _PS3 when power off
*/
void ide_acpi_set_state(ide_hwif_t *hwif, int on)
{
ide_drive_t *drive;
int i;
if (ide_noacpi_psx)
return;
DEBPRINT("ENTER:\n");
/* channel first and then drives for power on and verse versa for power off */
if (on)
acpi_bus_set_power(hwif->acpidata->obj_handle, ACPI_STATE_D0);
ide_port_for_each_present_dev(i, drive, hwif) {
if (drive->acpidata->obj_handle)
acpi_bus_set_power(drive->acpidata->obj_handle,
on ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
}
if (!on)
acpi_bus_set_power(hwif->acpidata->obj_handle,
ACPI_STATE_D3_COLD);
}
/**
* ide_acpi_init_port - initialize the ACPI link for an IDE interface
* @hwif: target IDE interface (channel)
*
* The ACPI spec is not quite clear when the drive identify buffer
* should be obtained. Calling IDENTIFY DEVICE during shutdown
* is not the best of ideas as the drive might already being put to
* sleep. And obviously we can't call it during resume.
* So we get the information during startup; but this means that
* any changes during run-time will be lost after resume.
*/
void ide_acpi_init_port(ide_hwif_t *hwif)
{
hwif->acpidata = kzalloc(sizeof(struct ide_acpi_hwif_link), GFP_KERNEL);
if (!hwif->acpidata)
return;
hwif->acpidata->obj_handle = ide_acpi_hwif_get_handle(hwif);
if (!hwif->acpidata->obj_handle) {
DEBPRINT("no ACPI object for %s found\n", hwif->name);
kfree(hwif->acpidata);
hwif->acpidata = NULL;
}
}
void ide_acpi_port_init_devices(ide_hwif_t *hwif)
{
ide_drive_t *drive;
int i, err;
if (hwif->acpidata == NULL)
return;
/*
* The ACPI spec mandates that we send information
* for both drives, regardless whether they are connected
* or not.
*/
hwif->devices[0]->acpidata = &hwif->acpidata->master;
hwif->devices[1]->acpidata = &hwif->acpidata->slave;
/* get _ADR info for each device */
ide_port_for_each_present_dev(i, drive, hwif) {
acpi_handle dev_handle;
DEBPRINT("ENTER: %s at channel#: %d port#: %d\n",
drive->name, hwif->channel, drive->dn & 1);
/* TBD: could also check ACPI object VALID bits */
dev_handle = acpi_get_child(hwif->acpidata->obj_handle,
drive->dn & 1);
DEBPRINT("drive %s handle 0x%p\n", drive->name, dev_handle);
drive->acpidata->obj_handle = dev_handle;
}
/* send IDENTIFY for each device */
ide_port_for_each_present_dev(i, drive, hwif) {
err = taskfile_lib_get_identify(drive, drive->acpidata->idbuff);
if (err)
DEBPRINT("identify device %s failed (%d)\n",
drive->name, err);
}
if (ide_noacpi || ide_acpionboot == 0) {
DEBPRINT("ACPI methods disabled on boot\n");
return;
}
/* ACPI _PS0 before _STM */
ide_acpi_set_state(hwif, 1);
/*
* ACPI requires us to call _STM on startup
*/
ide_acpi_get_timing(hwif);
ide_acpi_push_timing(hwif);
ide_port_for_each_present_dev(i, drive, hwif) {
ide_acpi_exec_tfs(drive);
}
}
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