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linux/drivers/ata/libata-acpi.c

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/*
* libata-acpi.c
* Provides ACPI support for PATA/SATA.
*
* Copyright (C) 2006 Intel Corp.
* Copyright (C) 2006 Randy Dunlap
*/
#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 "libata.h"
#include <acpi/acpi_bus.h>
#include <acpi/acnames.h>
#include <acpi/acnamesp.h>
#include <acpi/acparser.h>
#include <acpi/acexcep.h>
#include <acpi/acmacros.h>
#include <acpi/actypes.h>
#define SATA_ROOT_PORT(x) (((x) >> 16) & 0xffff)
#define SATA_PORT_NUMBER(x) ((x) & 0xffff) /* or NO_PORT_MULT */
#define NO_PORT_MULT 0xffff
#define SATA_ADR_RSVD 0xffffffff
#define REGS_PER_GTF 7
struct taskfile_array {
u8 tfa[REGS_PER_GTF]; /* regs. 0x1f1 - 0x1f7 */
};
/**
* sata_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
*
* This function is somewhat SATA-specific. Or at least the
* PATA & SATA versions of this function are different,
* so it's not entirely generic code.
*
* Returns 0 on success, <0 on error.
*/
static int sata_get_dev_handle(struct device *dev, acpi_handle *handle,
acpi_integer *pcidevfn)
{
struct pci_dev *pci_dev;
acpi_integer addr;
pci_dev = to_pci_dev(dev); /* NOTE: PCI-specific */
/* Please refer to the ACPI spec for the syntax of _ADR. */
addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
*pcidevfn = addr;
*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
if (!*handle)
return -ENODEV;
return 0;
}
/**
* pata_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
*
* The PATA and SATA versions of this function are different.
*
* Returns 0 on success, <0 on error.
*/
static int pata_get_dev_handle(struct device *dev, acpi_handle *handle,
acpi_integer *pcidevfn)
{
unsigned int bus, devnum, func;
acpi_integer addr;
acpi_handle dev_handle, parent_handle;
struct acpi_buffer buffer = {.length = ACPI_ALLOCATE_BUFFER,
.pointer = NULL};
acpi_status status;
struct acpi_device_info *dinfo = NULL;
int ret = -ENODEV;
struct pci_dev *pdev = to_pci_dev(dev);
bus = pdev->bus->number;
devnum = PCI_SLOT(pdev->devfn);
func = PCI_FUNC(pdev->devfn);
dev_handle = DEVICE_ACPI_HANDLE(dev);
parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
status = acpi_get_object_info(parent_handle, &buffer);
if (ACPI_FAILURE(status))
goto err;
dinfo = buffer.pointer;
if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
dinfo->address == bus) {
/* ACPI spec for _ADR for PCI bus: */
addr = (acpi_integer)(devnum << 16 | func);
*pcidevfn = addr;
*handle = dev_handle;
} else {
goto err;
}
if (!*handle)
goto err;
ret = 0;
err:
kfree(dinfo);
return ret;
}
struct walk_info { /* can be trimmed some */
struct device *dev;
struct acpi_device *adev;
acpi_handle handle;
acpi_integer pcidevfn;
unsigned int drivenum;
acpi_handle obj_handle;
struct ata_port *ataport;
struct ata_device *atadev;
u32 sata_adr;
int status;
char basepath[ACPI_PATHNAME_MAX];
int basepath_len;
};
static acpi_status get_devices(acpi_handle handle,
u32 level, void *context, void **return_value)
{
acpi_status status;
struct walk_info *winfo = context;
struct acpi_buffer namebuf = {ACPI_ALLOCATE_BUFFER, NULL};
char *pathname;
struct acpi_buffer buffer;
struct acpi_device_info *dinfo;
status = acpi_get_name(handle, ACPI_FULL_PATHNAME, &namebuf);
if (status)
goto ret;
pathname = namebuf.pointer;
buffer.length = ACPI_ALLOCATE_BUFFER;
buffer.pointer = NULL;
status = acpi_get_object_info(handle, &buffer);
if (ACPI_FAILURE(status))
goto out2;
dinfo = buffer.pointer;
/* find full device path name for pcidevfn */
if (dinfo && (dinfo->valid & ACPI_VALID_ADR) &&
dinfo->address == winfo->pcidevfn) {
if (ata_msg_probe(winfo->ataport))
ata_dev_printk(winfo->atadev, KERN_DEBUG,
":%s: matches pcidevfn (0x%llx)\n",
pathname, winfo->pcidevfn);
strlcpy(winfo->basepath, pathname,
sizeof(winfo->basepath));
winfo->basepath_len = strlen(pathname);
goto out;
}
/* if basepath is not yet known, ignore this object */
if (!winfo->basepath_len)
goto out;
/* if this object is in scope of basepath, maybe use it */
if (strncmp(pathname, winfo->basepath,
winfo->basepath_len) == 0) {
if (!(dinfo->valid & ACPI_VALID_ADR))
goto out;
if (ata_msg_probe(winfo->ataport))
ata_dev_printk(winfo->atadev, KERN_DEBUG,
"GOT ONE: (%s) root_port = 0x%llx,"
" port_num = 0x%llx\n", pathname,
SATA_ROOT_PORT(dinfo->address),
SATA_PORT_NUMBER(dinfo->address));
/* heuristics: */
if (SATA_PORT_NUMBER(dinfo->address) != NO_PORT_MULT)
if (ata_msg_probe(winfo->ataport))
ata_dev_printk(winfo->atadev,
KERN_DEBUG, "warning: don't"
" know how to handle SATA port"
" multiplier\n");
if (SATA_ROOT_PORT(dinfo->address) ==
winfo->ataport->port_no &&
SATA_PORT_NUMBER(dinfo->address) == NO_PORT_MULT) {
if (ata_msg_probe(winfo->ataport))
ata_dev_printk(winfo->atadev,
KERN_DEBUG,
"THIS ^^^^^ is the requested"
" SATA drive (handle = 0x%p)\n",
handle);
winfo->sata_adr = dinfo->address;
winfo->obj_handle = handle;
}
}
out:
kfree(dinfo);
out2:
kfree(pathname);
ret:
return status;
}
/* Get the SATA drive _ADR object. */
static int get_sata_adr(struct device *dev, acpi_handle handle,
acpi_integer pcidevfn, unsigned int drive,
struct ata_port *ap,
struct ata_device *atadev, u32 *dev_adr)
{
acpi_status status;
struct walk_info *winfo;
int err = -ENOMEM;
winfo = kzalloc(sizeof(struct walk_info), GFP_KERNEL);
if (!winfo)
goto out;
winfo->dev = dev;
winfo->atadev = atadev;
winfo->ataport = ap;
if (acpi_bus_get_device(handle, &winfo->adev) < 0)
if (ata_msg_probe(ap))
ata_dev_printk(winfo->atadev, KERN_DEBUG,
"acpi_bus_get_device failed\n");
winfo->handle = handle;
winfo->pcidevfn = pcidevfn;
winfo->drivenum = drive;
status = acpi_get_devices(NULL, get_devices, winfo, NULL);
if (ACPI_FAILURE(status)) {
if (ata_msg_probe(ap))
ata_dev_printk(winfo->atadev, KERN_DEBUG,
"%s: acpi_get_devices failed\n",
__FUNCTION__);
err = -ENODEV;
} else {
*dev_adr = winfo->sata_adr;
atadev->obj_handle = winfo->obj_handle;
err = 0;
}
kfree(winfo);
out:
return err;
}
/**
* do_drive_get_GTF - get the drive bootup default taskfile settings
* @ap: the ata_port for the drive
* @ix: target ata_device (drive) index
* @gtf_length: number of bytes of _GTF data returned at @gtf_address
* @gtf_address: 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.
*
* The returned @gtf_length and @gtf_address are only valid if the
* function return value is 0.
*/
static int do_drive_get_GTF(struct ata_port *ap, int ix,
unsigned int *gtf_length, unsigned long *gtf_address,
unsigned long *obj_loc)
{
acpi_status status;
acpi_handle dev_handle = NULL;
acpi_handle chan_handle, drive_handle;
acpi_integer pcidevfn = 0;
u32 dev_adr;
struct acpi_buffer output;
union acpi_object *out_obj;
struct device *dev = ap->host->dev;
struct ata_device *atadev = &ap->device[ix];
int err = -ENODEV;
*gtf_length = 0;
*gtf_address = 0UL;
*obj_loc = 0UL;
if (noacpi)
return 0;
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
__FUNCTION__, ap->port_no);
if (!ata_dev_enabled(atadev) || (ap->flags & ATA_FLAG_DISABLED)) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG, "%s: ERR: "
"ata_dev_present: %d, PORT_DISABLED: %lu\n",
__FUNCTION__, ata_dev_enabled(atadev),
ap->flags & ATA_FLAG_DISABLED);
goto out;
}
/* Don't continue if device has no _ADR method.
* _GTF is intended for known motherboard devices. */
if (!(ap->cbl == ATA_CBL_SATA)) {
err = pata_get_dev_handle(dev, &dev_handle, &pcidevfn);
if (err < 0) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG,
"%s: pata_get_dev_handle failed (%d)\n",
__FUNCTION__, err);
goto out;
}
} else {
err = sata_get_dev_handle(dev, &dev_handle, &pcidevfn);
if (err < 0) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG,
"%s: sata_get_dev_handle failed (%d\n",
__FUNCTION__, err);
goto out;
}
}
/* Get this drive's _ADR info. if not already known. */
if (!atadev->obj_handle) {
if (!(ap->cbl == ATA_CBL_SATA)) {
/* get child objects of dev_handle == channel objects,
* + _their_ children == drive objects */
/* channel is ap->port_no */
chan_handle = acpi_get_child(dev_handle,
ap->port_no);
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG,
"%s: chan adr=%d: chan_handle=0x%p\n",
__FUNCTION__, ap->port_no,
chan_handle);
if (!chan_handle) {
err = -ENODEV;
goto out;
}
/* TBD: could also check ACPI object VALID bits */
drive_handle = acpi_get_child(chan_handle, ix);
if (!drive_handle) {
err = -ENODEV;
goto out;
}
dev_adr = ix;
atadev->obj_handle = drive_handle;
} else { /* for SATA mode */
dev_adr = SATA_ADR_RSVD;
err = get_sata_adr(dev, dev_handle, pcidevfn, 0,
ap, atadev, &dev_adr);
}
if (err < 0 || dev_adr == SATA_ADR_RSVD ||
!atadev->obj_handle) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG,
"%s: get_sata/pata_adr failed: "
"err=%d, dev_adr=%u, obj_handle=0x%p\n",
__FUNCTION__, err, dev_adr,
atadev->obj_handle);
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(atadev->obj_handle, "_GTF",
NULL, &output);
if (ACPI_FAILURE(status)) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG,
"%s: Run _GTF error: status = 0x%x\n",
__FUNCTION__, status);
goto out;
}
if (!output.length || !output.pointer) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "
"length or ptr is NULL (0x%llx, 0x%p)\n",
__FUNCTION__,
(unsigned long long)output.length,
output.pointer);
kfree(output.pointer);
goto out;
}
out_obj = output.pointer;
if (out_obj->type != ACPI_TYPE_BUFFER) {
kfree(output.pointer);
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG, "%s: Run _GTF: "
"error: expected object type of "
" ACPI_TYPE_BUFFER, got 0x%x\n",
__FUNCTION__, out_obj->type);
err = -ENOENT;
goto out;
}
if (!out_obj->buffer.length || !out_obj->buffer.pointer ||
out_obj->buffer.length % REGS_PER_GTF) {
if (ata_msg_drv(ap))
ata_dev_printk(atadev, KERN_ERR,
"%s: unexpected GTF length (%d) or addr (0x%p)\n",
__FUNCTION__, out_obj->buffer.length,
out_obj->buffer.pointer);
err = -ENOENT;
goto out;
}
*gtf_length = out_obj->buffer.length;
*gtf_address = (unsigned long)out_obj->buffer.pointer;
*obj_loc = (unsigned long)out_obj;
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG, "%s: returning "
"gtf_length=%d, gtf_address=0x%lx, obj_loc=0x%lx\n",
__FUNCTION__, *gtf_length, *gtf_address, *obj_loc);
err = 0;
out:
return err;
}
/**
* taskfile_load_raw - send taskfile registers to host controller
* @ap: Port to which output is sent
* @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: TBD:
* Inherited from caller.
*/
static void taskfile_load_raw(struct ata_port *ap,
struct ata_device *atadev,
const struct taskfile_array *gtf)
{
struct ata_taskfile tf;
unsigned int err;
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG, "%s: (0x1f1-1f7): hex: "
"%02x %02x %02x %02x %02x %02x %02x\n",
__FUNCTION__,
gtf->tfa[0], gtf->tfa[1], gtf->tfa[2],
gtf->tfa[3], gtf->tfa[4], gtf->tfa[5], gtf->tfa[6]);
if ((gtf->tfa[0] == 0) && (gtf->tfa[1] == 0) && (gtf->tfa[2] == 0)
&& (gtf->tfa[3] == 0) && (gtf->tfa[4] == 0) && (gtf->tfa[5] == 0)
&& (gtf->tfa[6] == 0))
return;
ata_tf_init(atadev, &tf);
/* convert gtf to tf */
tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */
tf.protocol = atadev->class == ATA_DEV_ATAPI ?
ATA_PROT_ATAPI_NODATA : ATA_PROT_NODATA;
tf.feature = gtf->tfa[0]; /* 0x1f1 */
tf.nsect = gtf->tfa[1]; /* 0x1f2 */
tf.lbal = gtf->tfa[2]; /* 0x1f3 */
tf.lbam = gtf->tfa[3]; /* 0x1f4 */
tf.lbah = gtf->tfa[4]; /* 0x1f5 */
tf.device = gtf->tfa[5]; /* 0x1f6 */
tf.command = gtf->tfa[6]; /* 0x1f7 */
err = ata_exec_internal(atadev, &tf, NULL, DMA_NONE, NULL, 0);
if (err && ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_ERR,
"%s: ata_exec_internal failed: %u\n",
__FUNCTION__, err);
}
/**
* do_drive_set_taskfiles - write the drive taskfile settings from _GTF
* @ap: the ata_port for the drive
* @atadev: target ata_device
* @gtf_length: total number of bytes of _GTF taskfiles
* @gtf_address: location of _GTF taskfile arrays
*
* This applies to both PATA and SATA drives.
*
* Write {gtf_address, length gtf_length} in groups of
* REGS_PER_GTF bytes.
*/
static int do_drive_set_taskfiles(struct ata_port *ap,
struct ata_device *atadev, unsigned int gtf_length,
unsigned long gtf_address)
{
int err = -ENODEV;
int gtf_count = gtf_length / REGS_PER_GTF;
int ix;
struct taskfile_array *gtf;
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
__FUNCTION__, ap->port_no);
if (noacpi || !(ap->cbl == ATA_CBL_SATA))
return 0;
if (!ata_dev_enabled(atadev) || (ap->flags & ATA_FLAG_DISABLED))
goto out;
if (!gtf_count) /* shouldn't be here */
goto out;
if (gtf_length % REGS_PER_GTF) {
if (ata_msg_drv(ap))
ata_dev_printk(atadev, KERN_ERR,
"%s: unexpected GTF length (%d)\n",
__FUNCTION__, gtf_length);
goto out;
}
for (ix = 0; ix < gtf_count; ix++) {
gtf = (struct taskfile_array *)
(gtf_address + ix * REGS_PER_GTF);
/* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
taskfile_load_raw(ap, atadev, gtf);
}
err = 0;
out:
return err;
}
/**
* ata_acpi_exec_tfs - get then write drive taskfile settings
* @ap: the ata_port for the drive
*
* This applies to both PATA and SATA drives.
*/
int ata_acpi_exec_tfs(struct ata_port *ap)
{
int ix;
int ret =0;
unsigned int gtf_length;
unsigned long gtf_address;
unsigned long obj_loc;
if (noacpi)
return 0;
for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
if (!ata_dev_enabled(&ap->device[ix]))
continue;
ret = do_drive_get_GTF(ap, ix,
&gtf_length, &gtf_address, &obj_loc);
if (ret < 0) {
if (ata_msg_probe(ap))
ata_port_printk(ap, KERN_DEBUG,
"%s: get_GTF error (%d)\n",
__FUNCTION__, ret);
break;
}
ret = do_drive_set_taskfiles(ap, &ap->device[ix],
gtf_length, gtf_address);
kfree((void *)obj_loc);
if (ret < 0) {
if (ata_msg_probe(ap))
ata_port_printk(ap, KERN_DEBUG,
"%s: set_taskfiles error (%d)\n",
__FUNCTION__, ret);
break;
}
}
return ret;
}
/**
* ata_acpi_push_id - send Identify data to drive
* @ap: the ata_port for the drive
* @ix: drive index
*
* _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.
*/
int ata_acpi_push_id(struct ata_port *ap, unsigned int ix)
{
acpi_handle handle;
acpi_integer pcidevfn;
int err;
struct device *dev = ap->host->dev;
struct ata_device *atadev = &ap->device[ix];
u32 dev_adr;
acpi_status status;
struct acpi_object_list input;
union acpi_object in_params[1];
if (noacpi)
return 0;
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
__FUNCTION__, ix, ap->port_no);
/* Don't continue if not a SATA device. */
if (!(ap->cbl == ATA_CBL_SATA)) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG,
"%s: Not a SATA device\n", __FUNCTION__);
goto out;
}
/* Don't continue if device has no _ADR method.
* _SDD is intended for known motherboard devices. */
err = sata_get_dev_handle(dev, &handle, &pcidevfn);
if (err < 0) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG,
"%s: sata_get_dev_handle failed (%d\n",
__FUNCTION__, err);
goto out;
}
/* Get this drive's _ADR info, if not already known */
if (!atadev->obj_handle) {
dev_adr = SATA_ADR_RSVD;
err = get_sata_adr(dev, handle, pcidevfn, ix, ap, atadev,
&dev_adr);
if (err < 0 || dev_adr == SATA_ADR_RSVD ||
!atadev->obj_handle) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG,
"%s: get_sata_adr failed: "
"err=%d, dev_adr=%u, obj_handle=0x%p\n",
__FUNCTION__, err, dev_adr,
atadev->obj_handle);
goto out;
}
}
/* 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(atadev->id[0]) * ATA_ID_WORDS;
in_params[0].buffer.pointer = (u8 *)atadev->id;
/* Output buffer: _SDD has no output */
/* It's OK for _SDD to be missing too. */
swap_buf_le16(atadev->id, ATA_ID_WORDS);
status = acpi_evaluate_object(atadev->obj_handle, "_SDD", &input, NULL);
swap_buf_le16(atadev->id, ATA_ID_WORDS);
err = ACPI_FAILURE(status) ? -EIO : 0;
if (err < 0) {
if (ata_msg_probe(ap))
ata_dev_printk(atadev, KERN_DEBUG,
"%s _SDD error: status = 0x%x\n",
__FUNCTION__, status);
}
/* always return success */
out:
return 0;
}
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