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tegrakernel/kernel/kernel-4.9/drivers/ide/ide-acpi.c

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/*
* 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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