Linux-2.6.33.2/drivers/ata/libata-acpi.c
/*
* libata-acpi.c
* Provides ACPI support for PATA/SATA.
*
* Copyright (C) 2006 Intel Corp.
* Copyright (C) 2006 Randy Dunlap
*/
#include <linux/module.h>
#include <linux/ata.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/libata.h>
#include <linux/pci.h>
#include <scsi/scsi_device.h>
#include "libata.h"
#include <acpi/acpi_bus.h>
unsigned int ata_acpi_gtf_filter = ATA_ACPI_FILTER_DEFAULT;
module_param_named(acpi_gtf_filter, ata_acpi_gtf_filter, int, 0644);
MODULE_PARM_DESC(acpi_gtf_filter, "filter mask for ACPI _GTF commands, set to filter out (0x1=set xfermode, 0x2=lock/freeze lock, 0x4=DIPM, 0x8=FPDMA non-zero offset, 0x10=FPDMA DMA Setup FIS auto-activate)");
#define NO_PORT_MULT 0xffff
#define SATA_ADR(root, pmp) (((root) << 16) | (pmp))
#define REGS_PER_GTF 7
struct ata_acpi_gtf {
u8 tf[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
} __packed;
/*
* Helper - belongs in the PCI layer somewhere eventually
*/
static int is_pci_dev(struct device *dev)
{
return (dev->bus == &pci_bus_type);
}
static void ata_acpi_clear_gtf(struct ata_device *dev)
{
kfree(dev->gtf_cache);
dev->gtf_cache = NULL;
}
/**
* ata_acpi_associate_sata_port - associate SATA port with ACPI objects
* @ap: target SATA port
*
* Look up ACPI objects associated with @ap and initialize acpi_handle
* fields of @ap, the port and devices accordingly.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
void ata_acpi_associate_sata_port(struct ata_port *ap)
{
WARN_ON(!(ap->flags & ATA_FLAG_ACPI_SATA));
if (!sata_pmp_attached(ap)) {
acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
ap->link.device->acpi_handle =
acpi_get_child(ap->host->acpi_handle, adr);
} else {
struct ata_link *link;
ap->link.device->acpi_handle = NULL;
ata_for_each_link(link, ap, EDGE) {
acpi_integer adr = SATA_ADR(ap->port_no, link->pmp);
link->device->acpi_handle =
acpi_get_child(ap->host->acpi_handle, adr);
}
}
}
static void ata_acpi_associate_ide_port(struct ata_port *ap)
{
int max_devices, i;
ap->acpi_handle = acpi_get_child(ap->host->acpi_handle, ap->port_no);
if (!ap->acpi_handle)
return;
max_devices = 1;
if (ap->flags & ATA_FLAG_SLAVE_POSS)
max_devices++;
for (i = 0; i < max_devices; i++) {
struct ata_device *dev = &ap->link.device[i];
dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
}
if (ata_acpi_gtm(ap, &ap->__acpi_init_gtm) == 0)
ap->pflags |= ATA_PFLAG_INIT_GTM_VALID;
}
/* @ap and @dev are the same as ata_acpi_handle_hotplug() */
static void ata_acpi_detach_device(struct ata_port *ap, struct ata_device *dev)
{
if (dev)
dev->flags |= ATA_DFLAG_DETACH;
else {
struct ata_link *tlink;
struct ata_device *tdev;
ata_for_each_link(tlink, ap, EDGE)
ata_for_each_dev(tdev, tlink, ALL)
tdev->flags |= ATA_DFLAG_DETACH;
}
ata_port_schedule_eh(ap);
}
/**
* ata_acpi_handle_hotplug - ACPI event handler backend
* @ap: ATA port ACPI event occurred
* @dev: ATA device ACPI event occurred (can be NULL)
* @event: ACPI event which occurred
*
* All ACPI bay / device realted events end up in this function. If
* the event is port-wide @dev is NULL. If the event is specific to a
* device, @dev points to it.
*
* Hotplug (as opposed to unplug) notification is always handled as
* port-wide while unplug only kills the target device on device-wide
* event.
*
* LOCKING:
* ACPI notify handler context. May sleep.
*/
static void ata_acpi_handle_hotplug(struct ata_port *ap, struct ata_device *dev,
u32 event)
{
struct ata_eh_info *ehi = &ap->link.eh_info;
int wait = 0;
unsigned long flags;
acpi_handle handle;
if (dev)
handle = dev->acpi_handle;
else
handle = ap->acpi_handle;
spin_lock_irqsave(ap->lock, flags);
/*
* When dock driver calls into the routine, it will always use
* ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
* ACPI_NOTIFY_EJECT_REQUEST for remove
*/
switch (event) {
case ACPI_NOTIFY_BUS_CHECK:
case ACPI_NOTIFY_DEVICE_CHECK:
ata_ehi_push_desc(ehi, "ACPI event");
ata_ehi_hotplugged(ehi);
ata_port_freeze(ap);
break;
case ACPI_NOTIFY_EJECT_REQUEST:
ata_ehi_push_desc(ehi, "ACPI event");
ata_acpi_detach_device(ap, dev);
wait = 1;
break;
}
spin_unlock_irqrestore(ap->lock, flags);
if (wait)
ata_port_wait_eh(ap);
}
static void ata_acpi_dev_notify_dock(acpi_handle handle, u32 event, void *data)
{
struct ata_device *dev = data;
ata_acpi_handle_hotplug(dev->link->ap, dev, event);
}
static void ata_acpi_ap_notify_dock(acpi_handle handle, u32 event, void *data)
{
struct ata_port *ap = data;
ata_acpi_handle_hotplug(ap, NULL, event);
}
static void ata_acpi_uevent(struct ata_port *ap, struct ata_device *dev,
u32 event)
{
struct kobject *kobj = NULL;
char event_string[20];
char *envp[] = { event_string, NULL };
if (dev) {
if (dev->sdev)
kobj = &dev->sdev->sdev_gendev.kobj;
} else
kobj = &ap->dev->kobj;
if (kobj) {
snprintf(event_string, 20, "BAY_EVENT=%d", event);
kobject_uevent_env(kobj, KOBJ_CHANGE, envp);
}
}
static void ata_acpi_ap_uevent(acpi_handle handle, u32 event, void *data)
{
ata_acpi_uevent(data, NULL, event);
}
static void ata_acpi_dev_uevent(acpi_handle handle, u32 event, void *data)
{
struct ata_device *dev = data;
ata_acpi_uevent(dev->link->ap, dev, event);
}
static struct acpi_dock_ops ata_acpi_dev_dock_ops = {
.handler = ata_acpi_dev_notify_dock,
.uevent = ata_acpi_dev_uevent,
};
static struct acpi_dock_ops ata_acpi_ap_dock_ops = {
.handler = ata_acpi_ap_notify_dock,
.uevent = ata_acpi_ap_uevent,
};
/**
* ata_acpi_associate - associate ATA host with ACPI objects
* @host: target ATA host
*
* Look up ACPI objects associated with @host and initialize
* acpi_handle fields of @host, its ports and devices accordingly.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
void ata_acpi_associate(struct ata_host *host)
{
int i, j;
if (!is_pci_dev(host->dev) || libata_noacpi)
return;
host->acpi_handle = DEVICE_ACPI_HANDLE(host->dev);
if (!host->acpi_handle)
return;
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
if (host->ports[0]->flags & ATA_FLAG_ACPI_SATA)
ata_acpi_associate_sata_port(ap);
else
ata_acpi_associate_ide_port(ap);
if (ap->acpi_handle) {
/* we might be on a docking station */
register_hotplug_dock_device(ap->acpi_handle,
&ata_acpi_ap_dock_ops, ap);
}
for (j = 0; j < ata_link_max_devices(&ap->link); j++) {
struct ata_device *dev = &ap->link.device[j];
if (dev->acpi_handle) {
/* we might be on a docking station */
register_hotplug_dock_device(dev->acpi_handle,
&ata_acpi_dev_dock_ops, dev);
}
}
}
}
/**
* ata_acpi_dissociate - dissociate ATA host from ACPI objects
* @host: target ATA host
*
* This function is called during driver detach after the whole host
* is shut down.
*
* LOCKING:
* EH context.
*/
void ata_acpi_dissociate(struct ata_host *host)
{
int i;
/* Restore initial _GTM values so that driver which attaches
* afterward can use them too.
*/
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
if (ap->acpi_handle && gtm)
ata_acpi_stm(ap, gtm);
}
}
/**
* ata_acpi_gtm - execute _GTM
* @ap: target ATA port
* @gtm: out parameter for _GTM result
*
* Evaluate _GTM and store the result in @gtm.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -ENOENT if _GTM doesn't exist, -errno on failure.
*/
int ata_acpi_gtm(struct ata_port *ap, struct ata_acpi_gtm *gtm)
{
struct acpi_buffer output = { .length = ACPI_ALLOCATE_BUFFER };
union acpi_object *out_obj;
acpi_status status;
int rc = 0;
status = acpi_evaluate_object(ap->acpi_handle, "_GTM", NULL, &output);
rc = -ENOENT;
if (status == AE_NOT_FOUND)
goto out_free;
rc = -EINVAL;
if (ACPI_FAILURE(status)) {
ata_port_printk(ap, KERN_ERR,
"ACPI get timing mode failed (AE 0x%x)\n",
status);
goto out_free;
}
out_obj = output.pointer;
if (out_obj->type != ACPI_TYPE_BUFFER) {
ata_port_printk(ap, KERN_WARNING,
"_GTM returned unexpected object type 0x%x\n",
out_obj->type);
goto out_free;
}
if (out_obj->buffer.length != sizeof(struct ata_acpi_gtm)) {
ata_port_printk(ap, KERN_ERR,
"_GTM returned invalid length %d\n",
out_obj->buffer.length);
goto out_free;
}
memcpy(gtm, out_obj->buffer.pointer, sizeof(struct ata_acpi_gtm));
rc = 0;
out_free:
kfree(output.pointer);
return rc;
}
EXPORT_SYMBOL_GPL(ata_acpi_gtm);
/**
* ata_acpi_stm - execute _STM
* @ap: target ATA port
* @stm: timing parameter to _STM
*
* Evaluate _STM with timing parameter @stm.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -ENOENT if _STM doesn't exist, -errno on failure.
*/
int ata_acpi_stm(struct ata_port *ap, const struct ata_acpi_gtm *stm)
{
acpi_status status;
struct ata_acpi_gtm stm_buf = *stm;
struct acpi_object_list input;
union acpi_object in_params[3];
in_params[0].type = ACPI_TYPE_BUFFER;
in_params[0].buffer.length = sizeof(struct ata_acpi_gtm);
in_params[0].buffer.pointer = (u8 *)&stm_buf;
/* Buffers for id may need byteswapping ? */
in_params[1].type = ACPI_TYPE_BUFFER;
in_params[1].buffer.length = 512;
in_params[1].buffer.pointer = (u8 *)ap->link.device[0].id;
in_params[2].type = ACPI_TYPE_BUFFER;
in_params[2].buffer.length = 512;
in_params[2].buffer.pointer = (u8 *)ap->link.device[1].id;
input.count = 3;
input.pointer = in_params;
status = acpi_evaluate_object(ap->acpi_handle, "_STM", &input, NULL);
if (status == AE_NOT_FOUND)
return -ENOENT;
if (ACPI_FAILURE(status)) {
ata_port_printk(ap, KERN_ERR,
"ACPI set timing mode failed (status=0x%x)\n", status);
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL_GPL(ata_acpi_stm);
/**
* ata_dev_get_GTF - get the drive bootup default taskfile settings
* @dev: target ATA device
* @gtf: output parameter for buffer containing _GTF taskfile arrays
*
* This applies to both PATA and SATA drives.
*
* 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.
*
* LOCKING:
* EH context.
*
* RETURNS:
* Number of taskfiles on success, 0 if _GTF doesn't exist. -EINVAL
* if _GTF is invalid.
*/
static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf)
{
struct ata_port *ap = dev->link->ap;
acpi_status status;
struct acpi_buffer output;
union acpi_object *out_obj;
int rc = 0;
/* if _GTF is cached, use the cached value */
if (dev->gtf_cache) {
out_obj = dev->gtf_cache;
goto done;
}
/* set up output buffer */
output.length = ACPI_ALLOCATE_BUFFER;
output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
__func__, ap->port_no);
/* _GTF has no input parameters */
status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
out_obj = dev->gtf_cache = output.pointer;
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND) {
ata_dev_printk(dev, KERN_WARNING,
"_GTF evaluation failed (AE 0x%x)\n",
status);
rc = -EINVAL;
}
goto out_free;
}
if (!output.length || !output.pointer) {
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
"length or ptr is NULL (0x%llx, 0x%p)\n",
__func__,
(unsigned long long)output.length,
output.pointer);
rc = -EINVAL;
goto out_free;
}
if (out_obj->type != ACPI_TYPE_BUFFER) {
ata_dev_printk(dev, KERN_WARNING,
"_GTF unexpected object type 0x%x\n",
out_obj->type);
rc = -EINVAL;
goto out_free;
}
if (out_obj->buffer.length % REGS_PER_GTF) {
ata_dev_printk(dev, KERN_WARNING,
"unexpected _GTF length (%d)\n",
out_obj->buffer.length);
rc = -EINVAL;
goto out_free;
}
done:
rc = out_obj->buffer.length / REGS_PER_GTF;
if (gtf) {
*gtf = (void *)out_obj->buffer.pointer;
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG,
"%s: returning gtf=%p, gtf_count=%d\n",
__func__, *gtf, rc);
}
return rc;
out_free:
ata_acpi_clear_gtf(dev);
return rc;
}
/**
* ata_acpi_gtm_xfermode - determine xfermode from GTM parameter
* @dev: target device
* @gtm: GTM parameter to use
*
* Determine xfermask for @dev from @gtm.
*
* LOCKING:
* None.
*
* RETURNS:
* Determined xfermask.
*/
unsigned long ata_acpi_gtm_xfermask(struct ata_device *dev,
const struct ata_acpi_gtm *gtm)
{
unsigned long xfer_mask = 0;
unsigned int type;
int unit;
u8 mode;
/* we always use the 0 slot for crap hardware */
unit = dev->devno;
if (!(gtm->flags & 0x10))
unit = 0;
/* PIO */
mode = ata_timing_cycle2mode(ATA_SHIFT_PIO, gtm->drive[unit].pio);
xfer_mask |= ata_xfer_mode2mask(mode);
/* See if we have MWDMA or UDMA data. We don't bother with
* MWDMA if UDMA is available as this means the BIOS set UDMA
* and our error changedown if it works is UDMA to PIO anyway.
*/
if (!(gtm->flags & (1 << (2 * unit))))
type = ATA_SHIFT_MWDMA;
else
type = ATA_SHIFT_UDMA;
mode = ata_timing_cycle2mode(type, gtm->drive[unit].dma);
xfer_mask |= ata_xfer_mode2mask(mode);
return xfer_mask;
}
EXPORT_SYMBOL_GPL(ata_acpi_gtm_xfermask);
/**
* ata_acpi_cbl_80wire - Check for 80 wire cable
* @ap: Port to check
* @gtm: GTM data to use
*
* Return 1 if the @gtm indicates the BIOS selected an 80wire mode.
*/
int ata_acpi_cbl_80wire(struct ata_port *ap, const struct ata_acpi_gtm *gtm)
{
struct ata_device *dev;
ata_for_each_dev(dev, &ap->link, ENABLED) {
unsigned long xfer_mask, udma_mask;
xfer_mask = ata_acpi_gtm_xfermask(dev, gtm);
ata_unpack_xfermask(xfer_mask, NULL, NULL, &udma_mask);
if (udma_mask & ~ATA_UDMA_MASK_40C)
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(ata_acpi_cbl_80wire);
static void ata_acpi_gtf_to_tf(struct ata_device *dev,
const struct ata_acpi_gtf *gtf,
struct ata_taskfile *tf)
{
ata_tf_init(dev, tf);
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
tf->protocol = ATA_PROT_NODATA;
tf->feature = gtf->tf[0]; /* 0x1f1 */
tf->nsect = gtf->tf[1]; /* 0x1f2 */
tf->lbal = gtf->tf[2]; /* 0x1f3 */
tf->lbam = gtf->tf[3]; /* 0x1f4 */
tf->lbah = gtf->tf[4]; /* 0x1f5 */
tf->device = gtf->tf[5]; /* 0x1f6 */
tf->command = gtf->tf[6]; /* 0x1f7 */
}
static int ata_acpi_filter_tf(struct ata_device *dev,
const struct ata_taskfile *tf,
const struct ata_taskfile *ptf)
{
if (dev->gtf_filter & ATA_ACPI_FILTER_SETXFER) {
/* libata doesn't use ACPI to configure transfer mode.
* It will only confuse device configuration. Skip.
*/
if (tf->command == ATA_CMD_SET_FEATURES &&
tf->feature == SETFEATURES_XFER)
return 1;
}
if (dev->gtf_filter & ATA_ACPI_FILTER_LOCK) {
/* BIOS writers, sorry but we don't wanna lock
* features unless the user explicitly said so.
*/
/* DEVICE CONFIGURATION FREEZE LOCK */
if (tf->command == ATA_CMD_CONF_OVERLAY &&
tf->feature == ATA_DCO_FREEZE_LOCK)
return 1;
/* SECURITY FREEZE LOCK */
if (tf->command == ATA_CMD_SEC_FREEZE_LOCK)
return 1;
/* SET MAX LOCK and SET MAX FREEZE LOCK */
if ((!ptf || ptf->command != ATA_CMD_READ_NATIVE_MAX) &&
tf->command == ATA_CMD_SET_MAX &&
(tf->feature == ATA_SET_MAX_LOCK ||
tf->feature == ATA_SET_MAX_FREEZE_LOCK))
return 1;
}
if (tf->command == ATA_CMD_SET_FEATURES &&
tf->feature == SETFEATURES_SATA_ENABLE) {
/* inhibit enabling DIPM */
if (dev->gtf_filter & ATA_ACPI_FILTER_DIPM &&
tf->nsect == SATA_DIPM)
return 1;
/* inhibit FPDMA non-zero offset */
if (dev->gtf_filter & ATA_ACPI_FILTER_FPDMA_OFFSET &&
(tf->nsect == SATA_FPDMA_OFFSET ||
tf->nsect == SATA_FPDMA_IN_ORDER))
return 1;
/* inhibit FPDMA auto activation */
if (dev->gtf_filter & ATA_ACPI_FILTER_FPDMA_AA &&
tf->nsect == SATA_FPDMA_AA)
return 1;
}
return 0;
}
/**
* ata_acpi_run_tf - send taskfile registers to host controller
* @dev: target ATA device
* @gtf: raw ATA taskfile register set (0x1f1 - 0x1f7)
*
* Outputs ATA taskfile to standard ATA host controller using MMIO
* or PIO as indicated by the ATA_FLAG_MMIO flag.
* Writes the control, feature, nsect, lbal, lbam, and lbah registers.
* Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
* hob_lbal, hob_lbam, and hob_lbah.
*
* This function waits for idle (!BUSY and !DRQ) after writing
* registers. If the control register has a new value, this
* function also waits for idle after writing control and before
* writing the remaining registers.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 1 if command is executed successfully. 0 if ignored, rejected or
* filtered out, -errno on other errors.
*/
static int ata_acpi_run_tf(struct ata_device *dev,
const struct ata_acpi_gtf *gtf,
const struct ata_acpi_gtf *prev_gtf)
{
struct ata_taskfile *pptf = NULL;
struct ata_taskfile tf, ptf, rtf;
unsigned int err_mask;
const char *level;
const char *descr;
char msg[60];
int rc;
if ((gtf->tf[0] == 0) && (gtf->tf[1] == 0) && (gtf->tf[2] == 0)
&& (gtf->tf[3] == 0) && (gtf->tf[4] == 0) && (gtf->tf[5] == 0)
&& (gtf->tf[6] == 0))
return 0;
ata_acpi_gtf_to_tf(dev, gtf, &tf);
if (prev_gtf) {
ata_acpi_gtf_to_tf(dev, prev_gtf, &ptf);
pptf = &ptf;
}
if (!ata_acpi_filter_tf(dev, &tf, pptf)) {
rtf = tf;
err_mask = ata_exec_internal(dev, &rtf, NULL,
DMA_NONE, NULL, 0, 0);
switch (err_mask) {
case 0:
level = KERN_DEBUG;
snprintf(msg, sizeof(msg), "succeeded");
rc = 1;
break;
case AC_ERR_DEV:
level = KERN_INFO;
snprintf(msg, sizeof(msg),
"rejected by device (Stat=0x%02x Err=0x%02x)",
rtf.command, rtf.feature);
rc = 0;
break;
default:
level = KERN_ERR;
snprintf(msg, sizeof(msg),
"failed (Emask=0x%x Stat=0x%02x Err=0x%02x)",
err_mask, rtf.command, rtf.feature);
rc = -EIO;
break;
}
} else {
level = KERN_INFO;
snprintf(msg, sizeof(msg), "filtered out");
rc = 0;
}
descr = ata_get_cmd_descript(tf.command);
ata_dev_printk(dev, level,
"ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x (%s) %s\n",
tf.command, tf.feature, tf.nsect, tf.lbal,
tf.lbam, tf.lbah, tf.device,
(descr ? descr : "unknown"), msg);
return rc;
}
/**
* ata_acpi_exec_tfs - get then write drive taskfile settings
* @dev: target ATA device
* @nr_executed: out parameter for the number of executed commands
*
* Evaluate _GTF and execute returned taskfiles.
*
* LOCKING:
* EH context.
*
* RETURNS:
* Number of executed taskfiles on success, 0 if _GTF doesn't exist.
* -errno on other errors.
*/
static int ata_acpi_exec_tfs(struct ata_device *dev, int *nr_executed)
{
struct ata_acpi_gtf *gtf = NULL, *pgtf = NULL;
int gtf_count, i, rc;
/* get taskfiles */
rc = ata_dev_get_GTF(dev, >f);
if (rc < 0)
return rc;
gtf_count = rc;
/* execute them */
for (i = 0; i < gtf_count; i++, gtf++) {
rc = ata_acpi_run_tf(dev, gtf, pgtf);
if (rc < 0)
break;
if (rc) {
(*nr_executed)++;
pgtf = gtf;
}
}
ata_acpi_clear_gtf(dev);
if (rc < 0)
return rc;
return 0;
}
/**
* ata_acpi_push_id - send Identify data to drive
* @dev: target ATA device
*
* _SDD ACPI object: for SATA mode only
* Must be after Identify (Packet) Device -- uses its data
* ATM this function never returns a failure. It is an optional
* method and if it fails for whatever reason, we should still
* just keep going.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -ENOENT if _SDD doesn't exist, -errno on failure.
*/
static int ata_acpi_push_id(struct ata_device *dev)
{
struct ata_port *ap = dev->link->ap;
acpi_status status;
struct acpi_object_list input;
union acpi_object in_params[1];
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
__func__, dev->devno, ap->port_no);
/* Give the drive Identify data to the drive via the _SDD method */
/* _SDD: set up input parameters */
input.count = 1;
input.pointer = in_params;
in_params[0].type = ACPI_TYPE_BUFFER;
in_params[0].buffer.length = sizeof(dev->id[0]) * ATA_ID_WORDS;
in_params[0].buffer.pointer = (u8 *)dev->id;
/* Output buffer: _SDD has no output */
/* It's OK for _SDD to be missing too. */
swap_buf_le16(dev->id, ATA_ID_WORDS);
status = acpi_evaluate_object(dev->acpi_handle, "_SDD", &input, NULL);
swap_buf_le16(dev->id, ATA_ID_WORDS);
if (status == AE_NOT_FOUND)
return -ENOENT;
if (ACPI_FAILURE(status)) {
ata_dev_printk(dev, KERN_WARNING,
"ACPI _SDD failed (AE 0x%x)\n", status);
return -EIO;
}
return 0;
}
/**
* ata_acpi_on_suspend - ATA ACPI hook called on suspend
* @ap: target ATA port
*
* This function is called when @ap is about to be suspended. All
* devices are already put to sleep but the port_suspend() callback
* hasn't been executed yet. Error return from this function aborts
* suspend.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int ata_acpi_on_suspend(struct ata_port *ap)
{
/* nada */
return 0;
}
/**
* ata_acpi_on_resume - ATA ACPI hook called on resume
* @ap: target ATA port
*
* This function is called when @ap is resumed - right after port
* itself is resumed but before any EH action is taken.
*
* LOCKING:
* EH context.
*/
void ata_acpi_on_resume(struct ata_port *ap)
{
const struct ata_acpi_gtm *gtm = ata_acpi_init_gtm(ap);
struct ata_device *dev;
if (ap->acpi_handle && gtm) {
/* _GTM valid */
/* restore timing parameters */
ata_acpi_stm(ap, gtm);
/* _GTF should immediately follow _STM so that it can
* use values set by _STM. Cache _GTF result and
* schedule _GTF.
*/
ata_for_each_dev(dev, &ap->link, ALL) {
ata_acpi_clear_gtf(dev);
if (ata_dev_enabled(dev) &&
ata_dev_get_GTF(dev, NULL) >= 0)
dev->flags |= ATA_DFLAG_ACPI_PENDING;
}
} else {
/* SATA _GTF needs to be evaulated after _SDD and
* there's no reason to evaluate IDE _GTF early
* without _STM. Clear cache and schedule _GTF.
*/
ata_for_each_dev(dev, &ap->link, ALL) {
ata_acpi_clear_gtf(dev);
if (ata_dev_enabled(dev))
dev->flags |= ATA_DFLAG_ACPI_PENDING;
}
}
}
/**
* ata_acpi_set_state - set the port power state
* @ap: target ATA port
* @state: 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 ata_acpi_set_state(struct ata_port *ap, pm_message_t state)
{
struct ata_device *dev;
if (!ap->acpi_handle || (ap->flags & ATA_FLAG_ACPI_SATA))
return;
/* channel first and then drives for power on and vica versa
for power off */
if (state.event == PM_EVENT_ON)
acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D0);
ata_for_each_dev(dev, &ap->link, ENABLED) {
if (dev->acpi_handle)
acpi_bus_set_power(dev->acpi_handle,
state.event == PM_EVENT_ON ?
ACPI_STATE_D0 : ACPI_STATE_D3);
}
if (state.event != PM_EVENT_ON)
acpi_bus_set_power(ap->acpi_handle, ACPI_STATE_D3);
}
/**
* ata_acpi_on_devcfg - ATA ACPI hook called on device donfiguration
* @dev: target ATA device
*
* This function is called when @dev is about to be configured.
* IDENTIFY data might have been modified after this hook is run.
*
* LOCKING:
* EH context.
*
* RETURNS:
* Positive number if IDENTIFY data needs to be refreshed, 0 if not,
* -errno on failure.
*/
int ata_acpi_on_devcfg(struct ata_device *dev)
{
struct ata_port *ap = dev->link->ap;
struct ata_eh_context *ehc = &ap->link.eh_context;
int acpi_sata = ap->flags & ATA_FLAG_ACPI_SATA;
int nr_executed = 0;
int rc;
if (!dev->acpi_handle)
return 0;
/* do we need to do _GTF? */
if (!(dev->flags & ATA_DFLAG_ACPI_PENDING) &&
!(acpi_sata && (ehc->i.flags & ATA_EHI_DID_HARDRESET)))
return 0;
/* do _SDD if SATA */
if (acpi_sata) {
rc = ata_acpi_push_id(dev);
if (rc && rc != -ENOENT)
goto acpi_err;
}
/* do _GTF */
rc = ata_acpi_exec_tfs(dev, &nr_executed);
if (rc)
goto acpi_err;
dev->flags &= ~ATA_DFLAG_ACPI_PENDING;
/* refresh IDENTIFY page if any _GTF command has been executed */
if (nr_executed) {
rc = ata_dev_reread_id(dev, 0);
if (rc < 0) {
ata_dev_printk(dev, KERN_ERR, "failed to IDENTIFY "
"after ACPI commands\n");
return rc;
}
}
return 0;
acpi_err:
/* ignore evaluation failure if we can continue safely */
if (rc == -EINVAL && !nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
return 0;
/* fail and let EH retry once more for unknown IO errors */
if (!(dev->flags & ATA_DFLAG_ACPI_FAILED)) {
dev->flags |= ATA_DFLAG_ACPI_FAILED;
return rc;
}
ata_dev_printk(dev, KERN_WARNING,
"ACPI: failed the second time, disabled\n");
dev->acpi_handle = NULL;
/* We can safely continue if no _GTF command has been executed
* and port is not frozen.
*/
if (!nr_executed && !(ap->pflags & ATA_PFLAG_FROZEN))
return 0;
return rc;
}
/**
* ata_acpi_on_disable - ATA ACPI hook called when a device is disabled
* @dev: target ATA device
*
* This function is called when @dev is about to be disabled.
*
* LOCKING:
* EH context.
*/
void ata_acpi_on_disable(struct ata_device *dev)
{
ata_acpi_clear_gtf(dev);
}