/*
* 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 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_associate_sata_port(struct ata_port *ap)
{
acpi_integer adr = SATA_ADR(ap->port_no, NO_PORT_MULT);
ap->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->device[i];
dev->acpi_handle = acpi_get_child(ap->acpi_handle, i);
}
}
/**
* 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;
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);
}
}
/**
* ata_dev_get_GTF - get the drive bootup default taskfile settings
* @dev: target ATA device
* @gtf: output parameter for buffer containing _GTF taskfile arrays
* @ptr_to_free: pointer which should be freed
*
* 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 or doesn't
* contain valid data. -errno on other errors.
*/
static int ata_dev_get_GTF(struct ata_device *dev, struct ata_acpi_gtf **gtf,
void **ptr_to_free)
{
struct ata_port *ap = dev->ap;
acpi_status status;
struct acpi_buffer output;
union acpi_object *out_obj;
int rc = 0;
/* set up output buffer */
output.length = ACPI_ALLOCATE_BUFFER;
output.pointer = NULL; /* ACPI-CA sets this; save/free it later */
if (!dev->acpi_handle)
goto out_free;
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
__FUNCTION__, ap->port_no);
if (!ata_dev_enabled(dev) || (ap->flags & ATA_FLAG_DISABLED)) {
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: ERR: "
"ata_dev_present: %d, PORT_DISABLED: %lu\n",
__FUNCTION__, ata_dev_enabled(dev),
ap->flags & ATA_FLAG_DISABLED);
goto out_free;
}
/* _GTF has no input parameters */
status = acpi_evaluate_object(dev->acpi_handle, "_GTF", NULL, &output);
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND) {
ata_dev_printk(dev, KERN_WARNING,
"_GTF evaluation failed (AE 0x%x)\n",
status);
rc = -EIO;
}
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",
__FUNCTION__,
(unsigned long long)output.length,
output.pointer);
goto out_free;
}
out_obj = output.pointer;
if (out_obj->type != ACPI_TYPE_BUFFER) {
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: Run _GTF: "
"error: expected object type of "
" ACPI_TYPE_BUFFER, got 0x%x\n",
__FUNCTION__, out_obj->type);
rc = -EINVAL;
goto out_free;
}
if (out_obj->buffer.length % REGS_PER_GTF) {
if (ata_msg_drv(ap))
ata_dev_printk(dev, KERN_ERR,
"%s: unexpected GTF length (%d) or addr (0x%p)\n",
__FUNCTION__, out_obj->buffer.length,
out_obj->buffer.pointer);
rc = -EINVAL;
goto out_free;
}
*ptr_to_free = out_obj;
*gtf = (void *)out_obj->buffer.pointer;
rc = out_obj->buffer.length / REGS_PER_GTF;
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: returning "
"gtf=%p, gtf_count=%d, ptr_to_free=%p\n",
__FUNCTION__, *gtf, rc, *ptr_to_free);
return rc;
out_free:
kfree(output.pointer);
return rc;
}
/**
* taskfile_load_raw - 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:
* 0 on success, -errno on failure.
*/
static int taskfile_load_raw(struct ata_device *dev,
const struct ata_acpi_gtf *gtf)
{
struct ata_port *ap = dev->ap;
struct ata_taskfile tf, rtf;
unsigned int err_mask;
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_tf_init(dev, &tf);
/* convert gtf to tf */
tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; /* TBD */
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 */
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "executing ACPI cmd "
"%02x/%02x:%02x:%02x:%02x:%02x:%02x\n",
tf.command, tf.feature, tf.nsect,
tf.lbal, tf.lbam, tf.lbah, tf.device);
rtf = tf;
err_mask = ata_exec_internal(dev, &rtf, NULL, DMA_NONE, NULL, 0);
if (err_mask) {
ata_dev_printk(dev, KERN_ERR,
"ACPI cmd %02x/%02x:%02x:%02x:%02x:%02x:%02x failed "
"(Emask=0x%x Stat=0x%02x Err=0x%02x)\n",
tf.command, tf.feature, tf.nsect, tf.lbal, tf.lbam,
tf.lbah, tf.device, err_mask, rtf.command, rtf.feature);
return -EIO;
}
return 0;
}
/**
* ata_dev_set_taskfiles - write the drive taskfile settings from _GTF
* @dev: target ATA device
* @gtf: pointer to array of _GTF taskfiles to execute
* @gtf_count: number of taskfiles
*
* This applies to both PATA and SATA drives.
*
* Execute taskfiles in @gtf.
*
* LOCKING:
* EH context.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int ata_dev_set_taskfiles(struct ata_device *dev,
struct ata_acpi_gtf *gtf, int gtf_count)
{
struct ata_port *ap = dev->ap;
int ix;
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER: port#: %d\n",
__FUNCTION__, ap->port_no);
if (!(ap->flags & ATA_FLAG_ACPI_SATA))
return 0;
if (!ata_dev_enabled(dev) || (ap->flags & ATA_FLAG_DISABLED))
return -ENODEV;
/* send all TaskFile registers (0x1f1-0x1f7) *in*that*order* */
for (ix = 0; ix < gtf_count; ix++)
taskfile_load_raw(dev, gtf++);
return 0;
}
/**
* 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, ret = 0;
/*
* TBD - implement PATA support. For now,
* we should not run GTF on PATA devices since some
* PATA require execution of GTM/STM before GTF.
*/
if (!(ap->flags & ATA_FLAG_ACPI_SATA))
return 0;
for (ix = 0; ix < ATA_MAX_DEVICES; ix++) {
struct ata_device *dev = &ap->device[ix];
struct ata_acpi_gtf *gtf = NULL;
int gtf_count;
void *ptr_to_free = NULL;
if (!ata_dev_enabled(dev))
continue;
ret = ata_dev_get_GTF(dev, >f, &ptr_to_free);
if (ret == 0)
continue;
if (ret < 0) {
if (ata_msg_probe(ap))
ata_port_printk(ap, KERN_DEBUG,
"%s: get_GTF error (%d)\n",
__FUNCTION__, ret);
break;
}
gtf_count = ret;
ret = ata_dev_set_taskfiles(dev, gtf, gtf_count);
kfree(ptr_to_free);
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
* @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.
*/
int ata_acpi_push_id(struct ata_device *dev)
{
struct ata_port *ap = dev->ap;
int err;
acpi_status status;
struct acpi_object_list input;
union acpi_object in_params[1];
if (!dev->acpi_handle)
return 0;
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG, "%s: ix = %d, port#: %d\n",
__FUNCTION__, dev->devno, ap->port_no);
/* Don't continue if not a SATA device. */
if (!(ap->flags & ATA_FLAG_ACPI_SATA)) {
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG,
"%s: Not a SATA device\n", __FUNCTION__);
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(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);
err = ACPI_FAILURE(status) ? -EIO : 0;
if (err < 0) {
if (ata_msg_probe(ap))
ata_dev_printk(dev, KERN_DEBUG,
"%s _SDD error: status = 0x%x\n",
__FUNCTION__, status);
}
/* always return success */
out:
return 0;
}
