// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SATA specific part of ATA helper library
*
* Copyright 2003-2004 Red Hat, Inc. All rights reserved.
* Copyright 2003-2004 Jeff Garzik
* Copyright 2006 Tejun Heo <htejun@gmail.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <linux/libata.h>
#include <asm/unaligned.h>
#include "libata.h"
#include "libata-transport.h"
/* debounce timing parameters in msecs { interval, duration, timeout } */
const unsigned int sata_deb_timing_normal[] = { 5, 100, 2000 };
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
const unsigned int sata_deb_timing_hotplug[] = { 25, 500, 2000 };
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
const unsigned int sata_deb_timing_long[] = { 100, 2000, 5000 };
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
/**
* sata_scr_valid - test whether SCRs are accessible
* @link: ATA link to test SCR accessibility for
*
* Test whether SCRs are accessible for @link.
*
* LOCKING:
* None.
*
* RETURNS:
* 1 if SCRs are accessible, 0 otherwise.
*/
int sata_scr_valid(struct ata_link *link)
{
struct ata_port *ap = link->ap;
return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
}
EXPORT_SYMBOL_GPL(sata_scr_valid);
/**
* sata_scr_read - read SCR register of the specified port
* @link: ATA link to read SCR for
* @reg: SCR to read
* @val: Place to store read value
*
* Read SCR register @reg of @link into *@val. This function is
* guaranteed to succeed if @link is ap->link, the cable type of
* the port is SATA and the port implements ->scr_read.
*
* LOCKING:
* None if @link is ap->link. Kernel thread context otherwise.
*
* RETURNS:
* 0 on success, negative errno on failure.
*/
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
{
if (ata_is_host_link(link)) {
if (sata_scr_valid(link))
return link->ap->ops->scr_read(link, reg, val);
return -EOPNOTSUPP;
}
return sata_pmp_scr_read(link, reg, val);
}
EXPORT_SYMBOL_GPL(sata_scr_read);
/**
* sata_scr_write - write SCR register of the specified port
* @link: ATA link to write SCR for
* @reg: SCR to write
* @val: value to write
*
* Write @val to SCR register @reg of @link. This function is
* guaranteed to succeed if @link is ap->link, the cable type of
* the port is SATA and the port implements ->scr_read.
*
* LOCKING:
* None if @link is ap->link. Kernel thread context otherwise.
*
* RETURNS:
* 0 on success, negative errno on failure.
*/
int sata_scr_write(struct ata_link *link, int reg, u32 val)
{
if (ata_is_host_link(link)) {
if (sata_scr_valid(link))
return link->ap->ops->scr_write(link, reg, val);
return -EOPNOTSUPP;
}
return sata_pmp_scr_write(link, reg, val);
}
EXPORT_SYMBOL_GPL(sata_scr_write);
/**
* sata_scr_write_flush - write SCR register of the specified port and flush
* @link: ATA link to write SCR for
* @reg: SCR to write
* @val: value to write
*
* This function is identical to sata_scr_write() except that this
* function performs flush after writing to the register.
*
* LOCKING:
* None if @link is ap->link. Kernel thread context otherwise.
*
* RETURNS:
* 0 on success, negative errno on failure.
*/
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
{
if (ata_is_host_link(link)) {
int rc;
if (sata_scr_valid(link)) {
rc = link->ap->ops->scr_write(link, reg, val);
if (rc == 0)
rc = link->ap->ops->scr_read(link, reg, &val);
return rc;
}
return -EOPNOTSUPP;
}
return sata_pmp_scr_write(link, reg, val);
}
EXPORT_SYMBOL_GPL(sata_scr_write_flush);
/**
* ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
* @tf: Taskfile to convert
* @pmp: Port multiplier port
* @is_cmd: This FIS is for command
* @fis: Buffer into which data will output
*
* Converts a standard ATA t
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