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linux/drivers/ata/libahci.c
Xingui Yang 234e6d2c18 ata: ahci: Disable SXS for Hisilicon Kunpeng920 
On Hisilicon Kunpeng920, ESP is set to 1 by default for all ports of
SATA controller. In some scenarios, some ports are not external SATA ports,
and it cause disks connected to these ports to be identified as removable
disks. So disable the SXS capability on the software side to prevent users
from mistakenly considering non-removable disks as removable disks and
performing related operations.

Signed-off-by: Xingui Yang <yangxingui@huawei.com>
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1615544676-61926-1-git-send-email-luojiaxing@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-03-31 08:25:15 -06:00

2615 lines
68 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* libahci.c - Common AHCI SATA low-level routines
*
* Maintained by: Tejun Heo <tj@kernel.org>
* Please ALWAYS copy linux-ide@vger.kernel.org
* on emails.
*
* Copyright 2004-2005 Red Hat, Inc.
*
* libata documentation is available via 'make {ps|pdf}docs',
* as Documentation/driver-api/libata.rst
*
* AHCI hardware documentation:
* http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
* http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
*/
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/nospec.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>
#include <linux/pci.h>
#include "ahci.h"
#include "libata.h"
static int ahci_skip_host_reset;
int ahci_ignore_sss;
EXPORT_SYMBOL_GPL(ahci_ignore_sss);
module_param_named(skip_host_reset, ahci_skip_host_reset, int, 0444);
MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)");
module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");
static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
unsigned hints);
static ssize_t ahci_led_show(struct ata_port *ap, char *buf);
static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
size_t size);
static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
ssize_t size);
static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
static int ahci_port_start(struct ata_port *ap);
static void ahci_port_stop(struct ata_port *ap);
static enum ata_completion_errors ahci_qc_prep(struct ata_queued_cmd *qc);
static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc);
static void ahci_freeze(struct ata_port *ap);
static void ahci_thaw(struct ata_port *ap);
static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep);
static void ahci_enable_fbs(struct ata_port *ap);
static void ahci_disable_fbs(struct ata_port *ap);
static void ahci_pmp_attach(struct ata_port *ap);
static void ahci_pmp_detach(struct ata_port *ap);
static int ahci_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
static int ahci_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline);
static void ahci_postreset(struct ata_link *link, unsigned int *class);
static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
static void ahci_dev_config(struct ata_device *dev);
#ifdef CONFIG_PM
static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
#endif
static ssize_t ahci_activity_show(struct ata_device *dev, char *buf);
static ssize_t ahci_activity_store(struct ata_device *dev,
enum sw_activity val);
static void ahci_init_sw_activity(struct ata_link *link);
static ssize_t ahci_show_host_caps(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t ahci_show_host_cap2(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t ahci_show_host_version(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t ahci_show_port_cmd(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t ahci_read_em_buffer(struct device *dev,
struct device_attribute *attr, char *buf);
static ssize_t ahci_store_em_buffer(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size);
static ssize_t ahci_show_em_supported(struct device *dev,
struct device_attribute *attr, char *buf);
static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance);
static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
ahci_read_em_buffer, ahci_store_em_buffer);
static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
struct device_attribute *ahci_shost_attrs[] = {
&dev_attr_link_power_management_policy,
&dev_attr_em_message_type,
&dev_attr_em_message,
&dev_attr_ahci_host_caps,
&dev_attr_ahci_host_cap2,
&dev_attr_ahci_host_version,
&dev_attr_ahci_port_cmd,
&dev_attr_em_buffer,
&dev_attr_em_message_supported,
NULL
};
EXPORT_SYMBOL_GPL(ahci_shost_attrs);
struct device_attribute *ahci_sdev_attrs[] = {
&dev_attr_sw_activity,
&dev_attr_unload_heads,
&dev_attr_ncq_prio_enable,
NULL
};
EXPORT_SYMBOL_GPL(ahci_sdev_attrs);
struct ata_port_operations ahci_ops = {
.inherits = &sata_pmp_port_ops,
.qc_defer = ahci_pmp_qc_defer,
.qc_prep = ahci_qc_prep,
.qc_issue = ahci_qc_issue,
.qc_fill_rtf = ahci_qc_fill_rtf,
.freeze = ahci_freeze,
.thaw = ahci_thaw,
.softreset = ahci_softreset,
.hardreset = ahci_hardreset,
.postreset = ahci_postreset,
.pmp_softreset = ahci_softreset,
.error_handler = ahci_error_handler,
.post_internal_cmd = ahci_post_internal_cmd,
.dev_config = ahci_dev_config,
.scr_read = ahci_scr_read,
.scr_write = ahci_scr_write,
.pmp_attach = ahci_pmp_attach,
.pmp_detach = ahci_pmp_detach,
.set_lpm = ahci_set_lpm,
.em_show = ahci_led_show,
.em_store = ahci_led_store,
.sw_activity_show = ahci_activity_show,
.sw_activity_store = ahci_activity_store,
.transmit_led_message = ahci_transmit_led_message,
#ifdef CONFIG_PM
.port_suspend = ahci_port_suspend,
.port_resume = ahci_port_resume,
#endif
.port_start = ahci_port_start,
.port_stop = ahci_port_stop,
};
EXPORT_SYMBOL_GPL(ahci_ops);
struct ata_port_operations ahci_pmp_retry_srst_ops = {
.inherits = &ahci_ops,
.softreset = ahci_pmp_retry_softreset,
};
EXPORT_SYMBOL_GPL(ahci_pmp_retry_srst_ops);
static bool ahci_em_messages __read_mostly = true;
module_param(ahci_em_messages, bool, 0444);
/* add other LED protocol types when they become supported */
MODULE_PARM_DESC(ahci_em_messages,
"AHCI Enclosure Management Message control (0 = off, 1 = on)");
/* device sleep idle timeout in ms */
static int devslp_idle_timeout __read_mostly = 1000;
module_param(devslp_idle_timeout, int, 0644);
MODULE_PARM_DESC(devslp_idle_timeout, "device sleep idle timeout");
static void ahci_enable_ahci(void __iomem *mmio)
{
int i;
u32 tmp;
/* turn on AHCI_EN */
tmp = readl(mmio + HOST_CTL);
if (tmp & HOST_AHCI_EN)
return;
/* Some controllers need AHCI_EN to be written multiple times.
* Try a few times before giving up.
*/
for (i = 0; i < 5; i++) {
tmp |= HOST_AHCI_EN;
writel(tmp, mmio + HOST_CTL);
tmp = readl(mmio + HOST_CTL); /* flush && sanity check */
if (tmp & HOST_AHCI_EN)
return;
msleep(10);
}
WARN_ON(1);
}
/**
* ahci_rpm_get_port - Make sure the port is powered on
* @ap: Port to power on
*
* Whenever there is need to access the AHCI host registers outside of
* normal execution paths, call this function to make sure the host is
* actually powered on.
*/
static int ahci_rpm_get_port(struct ata_port *ap)
{
return pm_runtime_get_sync(ap->dev);
}
/**
* ahci_rpm_put_port - Undoes ahci_rpm_get_port()
* @ap: Port to power down
*
* Undoes ahci_rpm_get_port() and possibly powers down the AHCI host
* if it has no more active users.
*/
static void ahci_rpm_put_port(struct ata_port *ap)
{
pm_runtime_put(ap->dev);
}
static ssize_t ahci_show_host_caps(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
struct ahci_host_priv *hpriv = ap->host->private_data;
return sprintf(buf, "%x\n", hpriv->cap);
}
static ssize_t ahci_show_host_cap2(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
struct ahci_host_priv *hpriv = ap->host->private_data;
return sprintf(buf, "%x\n", hpriv->cap2);
}
static ssize_t ahci_show_host_version(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
struct ahci_host_priv *hpriv = ap->host->private_data;
return sprintf(buf, "%x\n", hpriv->version);
}
static ssize_t ahci_show_port_cmd(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
void __iomem *port_mmio = ahci_port_base(ap);
ssize_t ret;
ahci_rpm_get_port(ap);
ret = sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
ahci_rpm_put_port(ap);
return ret;
}
static ssize_t ahci_read_em_buffer(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *mmio = hpriv->mmio;
void __iomem *em_mmio = mmio + hpriv->em_loc;
u32 em_ctl, msg;
unsigned long flags;
size_t count;
int i;
ahci_rpm_get_port(ap);
spin_lock_irqsave(ap->lock, flags);
em_ctl = readl(mmio + HOST_EM_CTL);
if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
!(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO)) {
spin_unlock_irqrestore(ap->lock, flags);
ahci_rpm_put_port(ap);
return -EINVAL;
}
if (!(em_ctl & EM_CTL_MR)) {
spin_unlock_irqrestore(ap->lock, flags);
ahci_rpm_put_port(ap);
return -EAGAIN;
}
if (!(em_ctl & EM_CTL_SMB))
em_mmio += hpriv->em_buf_sz;
count = hpriv->em_buf_sz;
/* the count should not be larger than PAGE_SIZE */
if (count > PAGE_SIZE) {
if (printk_ratelimit())
ata_port_warn(ap,
"EM read buffer size too large: "
"buffer size %u, page size %lu\n",
hpriv->em_buf_sz, PAGE_SIZE);
count = PAGE_SIZE;
}
for (i = 0; i < count; i += 4) {
msg = readl(em_mmio + i);
buf[i] = msg & 0xff;
buf[i + 1] = (msg >> 8) & 0xff;
buf[i + 2] = (msg >> 16) & 0xff;
buf[i + 3] = (msg >> 24) & 0xff;
}
spin_unlock_irqrestore(ap->lock, flags);
ahci_rpm_put_port(ap);
return i;
}
static ssize_t ahci_store_em_buffer(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *mmio = hpriv->mmio;
void __iomem *em_mmio = mmio + hpriv->em_loc;
const unsigned char *msg_buf = buf;
u32 em_ctl, msg;
unsigned long flags;
int i;
/* check size validity */
if (!(ap->flags & ATA_FLAG_EM) ||
!(hpriv->em_msg_type & EM_MSG_TYPE_SGPIO) ||
size % 4 || size > hpriv->em_buf_sz)
return -EINVAL;
ahci_rpm_get_port(ap);
spin_lock_irqsave(ap->lock, flags);
em_ctl = readl(mmio + HOST_EM_CTL);
if (em_ctl & EM_CTL_TM) {
spin_unlock_irqrestore(ap->lock, flags);
ahci_rpm_put_port(ap);
return -EBUSY;
}
for (i = 0; i < size; i += 4) {
msg = msg_buf[i] | msg_buf[i + 1] << 8 |
msg_buf[i + 2] << 16 | msg_buf[i + 3] << 24;
writel(msg, em_mmio + i);
}
writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
spin_unlock_irqrestore(ap->lock, flags);
ahci_rpm_put_port(ap);
return size;
}
static ssize_t ahci_show_em_supported(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *mmio = hpriv->mmio;
u32 em_ctl;
ahci_rpm_get_port(ap);
em_ctl = readl(mmio + HOST_EM_CTL);
ahci_rpm_put_port(ap);
return sprintf(buf, "%s%s%s%s\n",
em_ctl & EM_CTL_LED ? "led " : "",
em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
em_ctl & EM_CTL_SES ? "ses-2 " : "",
em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
}
/**
* ahci_save_initial_config - Save and fixup initial config values
* @dev: target AHCI device
* @hpriv: host private area to store config values
*
* Some registers containing configuration info might be setup by
* BIOS and might be cleared on reset. This function saves the
* initial values of those registers into @hpriv such that they
* can be restored after controller reset.
*
* If inconsistent, config values are fixed up by this function.
*
* If it is not set already this function sets hpriv->start_engine to
* ahci_start_engine.
*
* LOCKING:
* None.
*/
void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
{
void __iomem *mmio = hpriv->mmio;
u32 cap, cap2, vers, port_map;
int i;
/* make sure AHCI mode is enabled before accessing CAP */
ahci_enable_ahci(mmio);
/* Values prefixed with saved_ are written back to host after
* reset. Values without are used for driver operation.
*/
hpriv->saved_cap = cap = readl(mmio + HOST_CAP);
hpriv->saved_port_map = port_map = readl(mmio + HOST_PORTS_IMPL);
/* CAP2 register is only defined for AHCI 1.2 and later */
vers = readl(mmio + HOST_VERSION);
if ((vers >> 16) > 1 ||
((vers >> 16) == 1 && (vers & 0xFFFF) >= 0x200))
hpriv->saved_cap2 = cap2 = readl(mmio + HOST_CAP2);
else
hpriv->saved_cap2 = cap2 = 0;
/* some chips have errata preventing 64bit use */
if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
dev_info(dev, "controller can't do 64bit DMA, forcing 32bit\n");
cap &= ~HOST_CAP_64;
}
if ((cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_NO_NCQ)) {
dev_info(dev, "controller can't do NCQ, turning off CAP_NCQ\n");
cap &= ~HOST_CAP_NCQ;
}
if (!(cap & HOST_CAP_NCQ) && (hpriv->flags & AHCI_HFLAG_YES_NCQ)) {
dev_info(dev, "controller can do NCQ, turning on CAP_NCQ\n");
cap |= HOST_CAP_NCQ;
}
if ((cap & HOST_CAP_PMP) && (hpriv->flags & AHCI_HFLAG_NO_PMP)) {
dev_info(dev, "controller can't do PMP, turning off CAP_PMP\n");
cap &= ~HOST_CAP_PMP;
}
if ((cap & HOST_CAP_SNTF) && (hpriv->flags & AHCI_HFLAG_NO_SNTF)) {
dev_info(dev,
"controller can't do SNTF, turning off CAP_SNTF\n");
cap &= ~HOST_CAP_SNTF;
}
if ((cap2 & HOST_CAP2_SDS) && (hpriv->flags & AHCI_HFLAG_NO_DEVSLP)) {
dev_info(dev,
"controller can't do DEVSLP, turning off\n");
cap2 &= ~HOST_CAP2_SDS;
cap2 &= ~HOST_CAP2_SADM;
}
if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
cap |= HOST_CAP_FBS;
}
if ((cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_NO_FBS)) {
dev_info(dev, "controller can't do FBS, turning off CAP_FBS\n");
cap &= ~HOST_CAP_FBS;
}
if (!(cap & HOST_CAP_ALPM) && (hpriv->flags & AHCI_HFLAG_YES_ALPM)) {
dev_info(dev, "controller can do ALPM, turning on CAP_ALPM\n");
cap |= HOST_CAP_ALPM;
}
if ((cap & HOST_CAP_SXS) && (hpriv->flags & AHCI_HFLAG_NO_SXS)) {
dev_info(dev, "controller does not support SXS, disabling CAP_SXS\n");
cap &= ~HOST_CAP_SXS;
}
if (hpriv->force_port_map && port_map != hpriv->force_port_map) {
dev_info(dev, "forcing port_map 0x%x -> 0x%x\n",
port_map, hpriv->force_port_map);
port_map = hpriv->force_port_map;
hpriv->saved_port_map = port_map;
}
if (hpriv->mask_port_map) {
dev_warn(dev, "masking port_map 0x%x -> 0x%x\n",
port_map,
port_map & hpriv->mask_port_map);
port_map &= hpriv->mask_port_map;
}
/* cross check port_map and cap.n_ports */
if (port_map) {
int map_ports = 0;
for (i = 0; i < AHCI_MAX_PORTS; i++)
if (port_map & (1 << i))
map_ports++;
/* If PI has more ports than n_ports, whine, clear
* port_map and let it be generated from n_ports.
*/
if (map_ports > ahci_nr_ports(cap)) {
dev_warn(dev,
"implemented port map (0x%x) contains more ports than nr_ports (%u), using nr_ports\n",
port_map, ahci_nr_ports(cap));
port_map = 0;
}
}
/* fabricate port_map from cap.nr_ports for < AHCI 1.3 */
if (!port_map && vers < 0x10300) {
port_map = (1 << ahci_nr_ports(cap)) - 1;
dev_warn(dev, "forcing PORTS_IMPL to 0x%x\n", port_map);
/* write the fixed up value to the PI register */
hpriv->saved_port_map = port_map;
}
/* record values to use during operation */
hpriv->cap = cap;
hpriv->cap2 = cap2;
hpriv->version = readl(mmio + HOST_VERSION);
hpriv->port_map = port_map;
if (!hpriv->start_engine)
hpriv->start_engine = ahci_start_engine;
if (!hpriv->stop_engine)
hpriv->stop_engine = ahci_stop_engine;
if (!hpriv->irq_handler)
hpriv->irq_handler = ahci_single_level_irq_intr;
}
EXPORT_SYMBOL_GPL(ahci_save_initial_config);
/**
* ahci_restore_initial_config - Restore initial config
* @host: target ATA host
*
* Restore initial config stored by ahci_save_initial_config().
*
* LOCKING:
* None.
*/
static void ahci_restore_initial_config(struct ata_host *host)
{
struct ahci_host_priv *hpriv = host->private_data;
void __iomem *mmio = hpriv->mmio;
writel(hpriv->saved_cap, mmio + HOST_CAP);
if (hpriv->saved_cap2)
writel(hpriv->saved_cap2, mmio + HOST_CAP2);
writel(hpriv->saved_port_map, mmio + HOST_PORTS_IMPL);
(void) readl(mmio + HOST_PORTS_IMPL); /* flush */
}
static unsigned ahci_scr_offset(struct ata_port *ap, unsigned int sc_reg)
{
static const int offset[] = {
[SCR_STATUS] = PORT_SCR_STAT,
[SCR_CONTROL] = PORT_SCR_CTL,
[SCR_ERROR] = PORT_SCR_ERR,
[SCR_ACTIVE] = PORT_SCR_ACT,
[SCR_NOTIFICATION] = PORT_SCR_NTF,
};
struct ahci_host_priv *hpriv = ap->host->private_data;
if (sc_reg < ARRAY_SIZE(offset) &&
(sc_reg != SCR_NOTIFICATION || (hpriv->cap & HOST_CAP_SNTF)))
return offset[sc_reg];
return 0;
}
static int ahci_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
{
void __iomem *port_mmio = ahci_port_base(link->ap);
int offset = ahci_scr_offset(link->ap, sc_reg);
if (offset) {
*val = readl(port_mmio + offset);
return 0;
}
return -EINVAL;
}
static int ahci_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
{
void __iomem *port_mmio = ahci_port_base(link->ap);
int offset = ahci_scr_offset(link->ap, sc_reg);
if (offset) {
writel(val, port_mmio + offset);
return 0;
}
return -EINVAL;
}
void ahci_start_engine(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
u32 tmp;
/* start DMA */
tmp = readl(port_mmio + PORT_CMD);
tmp |= PORT_CMD_START;
writel(tmp, port_mmio + PORT_CMD);
readl(port_mmio + PORT_CMD); /* flush */
}
EXPORT_SYMBOL_GPL(ahci_start_engine);
int ahci_stop_engine(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
struct ahci_host_priv *hpriv = ap->host->private_data;
u32 tmp;
/*
* On some controllers, stopping a port's DMA engine while the port
* is in ALPM state (partial or slumber) results in failures on
* subsequent DMA engine starts. For those controllers, put the
* port back in active state before stopping its DMA engine.
*/
if ((hpriv->flags & AHCI_HFLAG_WAKE_BEFORE_STOP) &&
(ap->link.lpm_policy > ATA_LPM_MAX_POWER) &&
ahci_set_lpm(&ap->link, ATA_LPM_MAX_POWER, ATA_LPM_WAKE_ONLY)) {
dev_err(ap->host->dev, "Failed to wake up port before engine stop\n");
return -EIO;
}
tmp = readl(port_mmio + PORT_CMD);
/* check if the HBA is idle */
if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
return 0;
/*
* Don't try to issue commands but return with ENODEV if the
* AHCI controller not available anymore (e.g. due to PCIe hot
* unplugging). Otherwise a 500ms delay for each port is added.
*/
if (tmp == 0xffffffff) {
dev_err(ap->host->dev, "AHCI controller unavailable!\n");
return -ENODEV;
}
/* setting HBA to idle */
tmp &= ~PORT_CMD_START;
writel(tmp, port_mmio + PORT_CMD);
/* wait for engine to stop. This could be as long as 500 msec */
tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
if (tmp & PORT_CMD_LIST_ON)
return -EIO;
return 0;
}
EXPORT_SYMBOL_GPL(ahci_stop_engine);
void ahci_start_fis_rx(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
u32 tmp;
/* set FIS registers */
if (hpriv->cap & HOST_CAP_64)
writel((pp->cmd_slot_dma >> 16) >> 16,
port_mmio + PORT_LST_ADDR_HI);
writel(pp->cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
if (hpriv->cap & HOST_CAP_64)
writel((pp->rx_fis_dma >> 16) >> 16,
port_mmio + PORT_FIS_ADDR_HI);
writel(pp->rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
/* enable FIS reception */
tmp = readl(port_mmio + PORT_CMD);
tmp |= PORT_CMD_FIS_RX;
writel(tmp, port_mmio + PORT_CMD);
/* flush */
readl(port_mmio + PORT_CMD);
}
EXPORT_SYMBOL_GPL(ahci_start_fis_rx);
static int ahci_stop_fis_rx(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
u32 tmp;
/* disable FIS reception */
tmp = readl(port_mmio + PORT_CMD);
tmp &= ~PORT_CMD_FIS_RX;
writel(tmp, port_mmio + PORT_CMD);
/* wait for completion, spec says 500ms, give it 1000 */
tmp = ata_wait_register(ap, port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
PORT_CMD_FIS_ON, 10, 1000);
if (tmp & PORT_CMD_FIS_ON)
return -EBUSY;
return 0;
}
static void ahci_power_up(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
u32 cmd;
cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
/* spin up device */
if (hpriv->cap & HOST_CAP_SSS) {
cmd |= PORT_CMD_SPIN_UP;
writel(cmd, port_mmio + PORT_CMD);
}
/* wake up link */
writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
}
static int ahci_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
unsigned int hints)
{
struct ata_port *ap = link->ap;
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
if (policy != ATA_LPM_MAX_POWER) {
/* wakeup flag only applies to the max power policy */
hints &= ~ATA_LPM_WAKE_ONLY;
/*
* Disable interrupts on Phy Ready. This keeps us from
* getting woken up due to spurious phy ready
* interrupts.
*/
pp->intr_mask &= ~PORT_IRQ_PHYRDY;
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
sata_link_scr_lpm(link, policy, false);
}
if (hpriv->cap & HOST_CAP_ALPM) {
u32 cmd = readl(port_mmio + PORT_CMD);
if (policy == ATA_LPM_MAX_POWER || !(hints & ATA_LPM_HIPM)) {
if (!(hints & ATA_LPM_WAKE_ONLY))
cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
cmd |= PORT_CMD_ICC_ACTIVE;
writel(cmd, port_mmio + PORT_CMD);
readl(port_mmio + PORT_CMD);
/* wait 10ms to be sure we've come out of LPM state */
ata_msleep(ap, 10);
if (hints & ATA_LPM_WAKE_ONLY)
return 0;
} else {
cmd |= PORT_CMD_ALPE;
if (policy == ATA_LPM_MIN_POWER)
cmd |= PORT_CMD_ASP;
else if (policy == ATA_LPM_MIN_POWER_WITH_PARTIAL)
cmd &= ~PORT_CMD_ASP;
/* write out new cmd value */
writel(cmd, port_mmio + PORT_CMD);
}
}
/* set aggressive device sleep */
if ((hpriv->cap2 & HOST_CAP2_SDS) &&
(hpriv->cap2 & HOST_CAP2_SADM) &&
(link->device->flags & ATA_DFLAG_DEVSLP)) {
if (policy == ATA_LPM_MIN_POWER ||
policy == ATA_LPM_MIN_POWER_WITH_PARTIAL)
ahci_set_aggressive_devslp(ap, true);
else
ahci_set_aggressive_devslp(ap, false);
}
if (policy == ATA_LPM_MAX_POWER) {
sata_link_scr_lpm(link, policy, false);
/* turn PHYRDY IRQ back on */
pp->intr_mask |= PORT_IRQ_PHYRDY;
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
}
return 0;
}
#ifdef CONFIG_PM
static void ahci_power_down(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
u32 cmd, scontrol;
if (!(hpriv->cap & HOST_CAP_SSS))
return;
/* put device into listen mode, first set PxSCTL.DET to 0 */
scontrol = readl(port_mmio + PORT_SCR_CTL);
scontrol &= ~0xf;
writel(scontrol, port_mmio + PORT_SCR_CTL);
/* then set PxCMD.SUD to 0 */
cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
cmd &= ~PORT_CMD_SPIN_UP;
writel(cmd, port_mmio + PORT_CMD);
}
#endif
static void ahci_start_port(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
struct ata_link *link;
struct ahci_em_priv *emp;
ssize_t rc;
int i;
/* enable FIS reception */
ahci_start_fis_rx(ap);
/* enable DMA */
if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
hpriv->start_engine(ap);
/* turn on LEDs */
if (ap->flags & ATA_FLAG_EM) {
ata_for_each_link(link, ap, EDGE) {
emp = &pp->em_priv[link->pmp];
/* EM Transmit bit maybe busy during init */
for (i = 0; i < EM_MAX_RETRY; i++) {
rc = ap->ops->transmit_led_message(ap,
emp->led_state,
4);
/*
* If busy, give a breather but do not
* release EH ownership by using msleep()
* instead of ata_msleep(). EM Transmit
* bit is busy for the whole host and
* releasing ownership will cause other
* ports to fail the same way.
*/
if (rc == -EBUSY)
msleep(1);
else
break;
}
}
}
if (ap->flags & ATA_FLAG_SW_ACTIVITY)
ata_for_each_link(link, ap, EDGE)
ahci_init_sw_activity(link);
}
static int ahci_deinit_port(struct ata_port *ap, const char **emsg)
{
int rc;
struct ahci_host_priv *hpriv = ap->host->private_data;
/* disable DMA */
rc = hpriv->stop_engine(ap);
if (rc) {
*emsg = "failed to stop engine";
return rc;
}
/* disable FIS reception */
rc = ahci_stop_fis_rx(ap);
if (rc) {
*emsg = "failed stop FIS RX";
return rc;
}
return 0;
}
int ahci_reset_controller(struct ata_host *host)
{
struct ahci_host_priv *hpriv = host->private_data;
void __iomem *mmio = hpriv->mmio;
u32 tmp;
/* we must be in AHCI mode, before using anything
* AHCI-specific, such as HOST_RESET.
*/
ahci_enable_ahci(mmio);
/* global controller reset */
if (!ahci_skip_host_reset) {
tmp = readl(mmio + HOST_CTL);
if ((tmp & HOST_RESET) == 0) {
writel(tmp | HOST_RESET, mmio + HOST_CTL);
readl(mmio + HOST_CTL); /* flush */
}
/*
* to perform host reset, OS should set HOST_RESET
* and poll until this bit is read to be "0".
* reset must complete within 1 second, or
* the hardware should be considered fried.
*/
tmp = ata_wait_register(NULL, mmio + HOST_CTL, HOST_RESET,
HOST_RESET, 10, 1000);
if (tmp & HOST_RESET) {
dev_err(host->dev, "controller reset failed (0x%x)\n",
tmp);
return -EIO;
}
/* turn on AHCI mode */
ahci_enable_ahci(mmio);
/* Some registers might be cleared on reset. Restore
* initial values.
*/
if (!(hpriv->flags & AHCI_HFLAG_NO_WRITE_TO_RO))
ahci_restore_initial_config(host);
} else
dev_info(host->dev, "skipping global host reset\n");
return 0;
}
EXPORT_SYMBOL_GPL(ahci_reset_controller);
static void ahci_sw_activity(struct ata_link *link)
{
struct ata_port *ap = link->ap;
struct ahci_port_priv *pp = ap->private_data;
struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
if (!(link->flags & ATA_LFLAG_SW_ACTIVITY))
return;
emp->activity++;
if (!timer_pending(&emp->timer))
mod_timer(&emp->timer, jiffies + msecs_to_jiffies(10));
}
static void ahci_sw_activity_blink(struct timer_list *t)
{
struct ahci_em_priv *emp = from_timer(emp, t, timer);
struct ata_link *link = emp->link;
struct ata_port *ap = link->ap;
unsigned long led_message = emp->led_state;
u32 activity_led_state;
unsigned long flags;
led_message &= EM_MSG_LED_VALUE;
led_message |= ap->port_no | (link->pmp << 8);
/* check to see if we've had activity. If so,
* toggle state of LED and reset timer. If not,
* turn LED to desired idle state.
*/
spin_lock_irqsave(ap->lock, flags);
if (emp->saved_activity != emp->activity) {
emp->saved_activity = emp->activity;
/* get the current LED state */
activity_led_state = led_message & EM_MSG_LED_VALUE_ON;
if (activity_led_state)
activity_led_state = 0;
else
activity_led_state = 1;
/* clear old state */
led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
/* toggle state */
led_message |= (activity_led_state << 16);
mod_timer(&emp->timer, jiffies + msecs_to_jiffies(100));
} else {
/* switch to idle */
led_message &= ~EM_MSG_LED_VALUE_ACTIVITY;
if (emp->blink_policy == BLINK_OFF)
led_message |= (1 << 16);
}
spin_unlock_irqrestore(ap->lock, flags);
ap->ops->transmit_led_message(ap, led_message, 4);
}
static void ahci_init_sw_activity(struct ata_link *link)
{
struct ata_port *ap = link->ap;
struct ahci_port_priv *pp = ap->private_data;
struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
/* init activity stats, setup timer */
emp->saved_activity = emp->activity = 0;
emp->link = link;
timer_setup(&emp->timer, ahci_sw_activity_blink, 0);
/* check our blink policy and set flag for link if it's enabled */
if (emp->blink_policy)
link->flags |= ATA_LFLAG_SW_ACTIVITY;
}
int ahci_reset_em(struct ata_host *host)
{
struct ahci_host_priv *hpriv = host->private_data;
void __iomem *mmio = hpriv->mmio;
u32 em_ctl;
em_ctl = readl(mmio + HOST_EM_CTL);
if ((em_ctl & EM_CTL_TM) || (em_ctl & EM_CTL_RST))
return -EINVAL;
writel(em_ctl | EM_CTL_RST, mmio + HOST_EM_CTL);
return 0;
}
EXPORT_SYMBOL_GPL(ahci_reset_em);
static ssize_t ahci_transmit_led_message(struct ata_port *ap, u32 state,
ssize_t size)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
void __iomem *mmio = hpriv->mmio;
u32 em_ctl;
u32 message[] = {0, 0};
unsigned long flags;
int pmp;
struct ahci_em_priv *emp;
/* get the slot number from the message */
pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
if (pmp < EM_MAX_SLOTS)
emp = &pp->em_priv[pmp];
else
return -EINVAL;
ahci_rpm_get_port(ap);
spin_lock_irqsave(ap->lock, flags);
/*
* if we are still busy transmitting a previous message,
* do not allow
*/
em_ctl = readl(mmio + HOST_EM_CTL);
if (em_ctl & EM_CTL_TM) {
spin_unlock_irqrestore(ap->lock, flags);
ahci_rpm_put_port(ap);
return -EBUSY;
}
if (hpriv->em_msg_type & EM_MSG_TYPE_LED) {
/*
* create message header - this is all zero except for
* the message size, which is 4 bytes.
*/
message[0] |= (4 << 8);
/* ignore 0:4 of byte zero, fill in port info yourself */
message[1] = ((state & ~EM_MSG_LED_HBA_PORT) | ap->port_no);
/* write message to EM_LOC */
writel(message[0], mmio + hpriv->em_loc);
writel(message[1], mmio + hpriv->em_loc+4);
/*
* tell hardware to transmit the message
*/
writel(em_ctl | EM_CTL_TM, mmio + HOST_EM_CTL);
}
/* save off new led state for port/slot */
emp->led_state = state;
spin_unlock_irqrestore(ap->lock, flags);
ahci_rpm_put_port(ap);
return size;
}
static ssize_t ahci_led_show(struct ata_port *ap, char *buf)
{
struct ahci_port_priv *pp = ap->private_data;
struct ata_link *link;
struct ahci_em_priv *emp;
int rc = 0;
ata_for_each_link(link, ap, EDGE) {
emp = &pp->em_priv[link->pmp];
rc += sprintf(buf, "%lx\n", emp->led_state);
}
return rc;
}
static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
size_t size)
{
unsigned int state;
int pmp;
struct ahci_port_priv *pp = ap->private_data;
struct ahci_em_priv *emp;
if (kstrtouint(buf, 0, &state) < 0)
return -EINVAL;
/* get the slot number from the message */
pmp = (state & EM_MSG_LED_PMP_SLOT) >> 8;
if (pmp < EM_MAX_SLOTS) {
pmp = array_index_nospec(pmp, EM_MAX_SLOTS);
emp = &pp->em_priv[pmp];
} else {
return -EINVAL;
}
/* mask off the activity bits if we are in sw_activity
* mode, user should turn off sw_activity before setting
* activity led through em_message
*/
if (emp->blink_policy)
state &= ~EM_MSG_LED_VALUE_ACTIVITY;
return ap->ops->transmit_led_message(ap, state, size);
}
static ssize_t ahci_activity_store(struct ata_device *dev, enum sw_activity val)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
struct ahci_port_priv *pp = ap->private_data;
struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
u32 port_led_state = emp->led_state;
/* save the desired Activity LED behavior */
if (val == OFF) {
/* clear LFLAG */
link->flags &= ~(ATA_LFLAG_SW_ACTIVITY);
/* set the LED to OFF */
port_led_state &= EM_MSG_LED_VALUE_OFF;
port_led_state |= (ap->port_no | (link->pmp << 8));
ap->ops->transmit_led_message(ap, port_led_state, 4);
} else {
link->flags |= ATA_LFLAG_SW_ACTIVITY;
if (val == BLINK_OFF) {
/* set LED to ON for idle */
port_led_state &= EM_MSG_LED_VALUE_OFF;
port_led_state |= (ap->port_no | (link->pmp << 8));
port_led_state |= EM_MSG_LED_VALUE_ON; /* check this */
ap->ops->transmit_led_message(ap, port_led_state, 4);
}
}
emp->blink_policy = val;
return 0;
}
static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
struct ahci_port_priv *pp = ap->private_data;
struct ahci_em_priv *emp = &pp->em_priv[link->pmp];
/* display the saved value of activity behavior for this
* disk.
*/
return sprintf(buf, "%d\n", emp->blink_policy);
}
static void ahci_port_init(struct device *dev, struct ata_port *ap,
int port_no, void __iomem *mmio,
void __iomem *port_mmio)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
const char *emsg = NULL;
int rc;
u32 tmp;
/* make sure port is not active */
rc = ahci_deinit_port(ap, &emsg);
if (rc)
dev_warn(dev, "%s (%d)\n", emsg, rc);
/* clear SError */
tmp = readl(port_mmio + PORT_SCR_ERR);
VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
writel(tmp, port_mmio + PORT_SCR_ERR);
/* clear port IRQ */
tmp = readl(port_mmio + PORT_IRQ_STAT);
VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
if (tmp)
writel(tmp, port_mmio + PORT_IRQ_STAT);
writel(1 << port_no, mmio + HOST_IRQ_STAT);
/* mark esata ports */
tmp = readl(port_mmio + PORT_CMD);
if ((tmp & PORT_CMD_ESP) && (hpriv->cap & HOST_CAP_SXS))
ap->pflags |= ATA_PFLAG_EXTERNAL;
}
void ahci_init_controller(struct ata_host *host)
{
struct ahci_host_priv *hpriv = host->private_data;
void __iomem *mmio = hpriv->mmio;
int i;
void __iomem *port_mmio;
u32 tmp;
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
port_mmio = ahci_port_base(ap);
if (ata_port_is_dummy(ap))
continue;
ahci_port_init(host->dev, ap, i, mmio, port_mmio);
}
tmp = readl(mmio + HOST_CTL);
VPRINTK("HOST_CTL 0x%x\n", tmp);
writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
tmp = readl(mmio + HOST_CTL);
VPRINTK("HOST_CTL 0x%x\n", tmp);
}
EXPORT_SYMBOL_GPL(ahci_init_controller);
static void ahci_dev_config(struct ata_device *dev)
{
struct ahci_host_priv *hpriv = dev->link->ap->host->private_data;
if (hpriv->flags & AHCI_HFLAG_SECT255) {
dev->max_sectors = 255;
ata_dev_info(dev,
"SB600 AHCI: limiting to 255 sectors per cmd\n");
}
}
unsigned int ahci_dev_classify(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
struct ata_taskfile tf;
u32 tmp;
tmp = readl(port_mmio + PORT_SIG);
tf.lbah = (tmp >> 24) & 0xff;
tf.lbam = (tmp >> 16) & 0xff;
tf.lbal = (tmp >> 8) & 0xff;
tf.nsect = (tmp) & 0xff;
return ata_dev_classify(&tf);
}
EXPORT_SYMBOL_GPL(ahci_dev_classify);
void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
u32 opts)
{
dma_addr_t cmd_tbl_dma;
cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
pp->cmd_slot[tag].opts = cpu_to_le32(opts);
pp->cmd_slot[tag].status = 0;
pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
}
EXPORT_SYMBOL_GPL(ahci_fill_cmd_slot);
int ahci_kick_engine(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
struct ahci_host_priv *hpriv = ap->host->private_data;
u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
u32 tmp;
int busy, rc;
/* stop engine */
rc = hpriv->stop_engine(ap);
if (rc)
goto out_restart;
/* need to do CLO?
* always do CLO if PMP is attached (AHCI-1.3 9.2)
*/
busy = status & (ATA_BUSY | ATA_DRQ);
if (!busy && !sata_pmp_attached(ap)) {
rc = 0;
goto out_restart;
}
if (!(hpriv->cap & HOST_CAP_CLO)) {
rc = -EOPNOTSUPP;
goto out_restart;
}
/* perform CLO */
tmp = readl(port_mmio + PORT_CMD);
tmp |= PORT_CMD_CLO;
writel(tmp, port_mmio + PORT_CMD);
rc = 0;
tmp = ata_wait_register(ap, port_mmio + PORT_CMD,
PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
if (tmp & PORT_CMD_CLO)
rc = -EIO;
/* restart engine */
out_restart:
hpriv->start_engine(ap);
return rc;
}
EXPORT_SYMBOL_GPL(ahci_kick_engine);
static int ahci_exec_polled_cmd(struct ata_port *ap, int pmp,
struct ata_taskfile *tf, int is_cmd, u16 flags,
unsigned long timeout_msec)
{
const u32 cmd_fis_len = 5; /* five dwords */
struct ahci_port_priv *pp = ap->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
u8 *fis = pp->cmd_tbl;
u32 tmp;
/* prep the command */
ata_tf_to_fis(tf, pmp, is_cmd, fis);
ahci_fill_cmd_slot(pp, 0, cmd_fis_len | flags | (pmp << 12));
/* set port value for softreset of Port Multiplier */
if (pp->fbs_enabled && pp->fbs_last_dev != pmp) {
tmp = readl(port_mmio + PORT_FBS);
tmp &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
tmp |= pmp << PORT_FBS_DEV_OFFSET;
writel(tmp, port_mmio + PORT_FBS);
pp->fbs_last_dev = pmp;
}
/* issue & wait */
writel(1, port_mmio + PORT_CMD_ISSUE);
if (timeout_msec) {
tmp = ata_wait_register(ap, port_mmio + PORT_CMD_ISSUE,
0x1, 0x1, 1, timeout_msec);
if (tmp & 0x1) {
ahci_kick_engine(ap);
return -EBUSY;
}
} else
readl(port_mmio + PORT_CMD_ISSUE); /* flush */
return 0;
}
int ahci_do_softreset(struct ata_link *link, unsigned int *class,
int pmp, unsigned long deadline,
int (*check_ready)(struct ata_link *link))
{
struct ata_port *ap = link->ap;
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
const char *reason = NULL;
unsigned long now, msecs;
struct ata_taskfile tf;
bool fbs_disabled = false;
int rc;
DPRINTK("ENTER\n");
/* prepare for SRST (AHCI-1.1 10.4.1) */
rc = ahci_kick_engine(ap);
if (rc && rc != -EOPNOTSUPP)
ata_link_warn(link, "failed to reset engine (errno=%d)\n", rc);
/*
* According to AHCI-1.2 9.3.9: if FBS is enable, software shall
* clear PxFBS.EN to '0' prior to issuing software reset to devices
* that is attached to port multiplier.
*/
if (!ata_is_host_link(link) && pp->fbs_enabled) {
ahci_disable_fbs(ap);
fbs_disabled = true;
}
ata_tf_init(link->device, &tf);
/* issue the first H2D Register FIS */
msecs = 0;
now = jiffies;
if (time_after(deadline, now))
msecs = jiffies_to_msecs(deadline - now);
tf.ctl |= ATA_SRST;
if (ahci_exec_polled_cmd(ap, pmp, &tf, 0,
AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY, msecs)) {
rc = -EIO;
reason = "1st FIS failed";
goto fail;
}
/* spec says at least 5us, but be generous and sleep for 1ms */
ata_msleep(ap, 1);
/* issue the second H2D Register FIS */
tf.ctl &= ~ATA_SRST;
ahci_exec_polled_cmd(ap, pmp, &tf, 0, 0, 0);
/* wait for link to become ready */
rc = ata_wait_after_reset(link, deadline, check_ready);
if (rc == -EBUSY && hpriv->flags & AHCI_HFLAG_SRST_TOUT_IS_OFFLINE) {
/*
* Workaround for cases where link online status can't
* be trusted. Treat device readiness timeout as link
* offline.
*/
ata_link_info(link, "device not ready, treating as offline\n");
*class = ATA_DEV_NONE;
} else if (rc) {
/* link occupied, -ENODEV too is an error */
reason = "device not ready";
goto fail;
} else
*class = ahci_dev_classify(ap);
/* re-enable FBS if disabled before */
if (fbs_disabled)
ahci_enable_fbs(ap);
DPRINTK("EXIT, class=%u\n", *class);
return 0;
fail:
ata_link_err(link, "softreset failed (%s)\n", reason);
return rc;
}
int ahci_check_ready(struct ata_link *link)
{
void __iomem *port_mmio = ahci_port_base(link->ap);
u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
return ata_check_ready(status);
}
EXPORT_SYMBOL_GPL(ahci_check_ready);
static int ahci_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
int pmp = sata_srst_pmp(link);
DPRINTK("ENTER\n");
return ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
}
EXPORT_SYMBOL_GPL(ahci_do_softreset);
static int ahci_bad_pmp_check_ready(struct ata_link *link)
{
void __iomem *port_mmio = ahci_port_base(link->ap);
u8 status = readl(port_mmio + PORT_TFDATA) & 0xFF;
u32 irq_status = readl(port_mmio + PORT_IRQ_STAT);
/*
* There is no need to check TFDATA if BAD PMP is found due to HW bug,
* which can save timeout delay.
*/
if (irq_status & PORT_IRQ_BAD_PMP)
return -EIO;
return ata_check_ready(status);
}
static int ahci_pmp_retry_softreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
void __iomem *port_mmio = ahci_port_base(ap);
int pmp = sata_srst_pmp(link);
int rc;
u32 irq_sts;
DPRINTK("ENTER\n");
rc = ahci_do_softreset(link, class, pmp, deadline,
ahci_bad_pmp_check_ready);
/*
* Soft reset fails with IPMS set when PMP is enabled but
* SATA HDD/ODD is connected to SATA port, do soft reset
* again to port 0.
*/
if (rc == -EIO) {
irq_sts = readl(port_mmio + PORT_IRQ_STAT);
if (irq_sts & PORT_IRQ_BAD_PMP) {
ata_link_warn(link,
"applying PMP SRST workaround "
"and retrying\n");
rc = ahci_do_softreset(link, class, 0, deadline,
ahci_check_ready);
}
}
return rc;
}
int ahci_do_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline, bool *online)
{
const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
struct ata_port *ap = link->ap;
struct ahci_port_priv *pp = ap->private_data;
struct ahci_host_priv *hpriv = ap->host->private_data;
u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
struct ata_taskfile tf;
int rc;
DPRINTK("ENTER\n");
hpriv->stop_engine(ap);
/* clear D2H reception area to properly wait for D2H FIS */
ata_tf_init(link->device, &tf);
tf.command = ATA_BUSY;
ata_tf_to_fis(&tf, 0, 0, d2h_fis);
rc = sata_link_hardreset(link, timing, deadline, online,
ahci_check_ready);
hpriv->start_engine(ap);
if (*online)
*class = ahci_dev_classify(ap);
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
return rc;
}
EXPORT_SYMBOL_GPL(ahci_do_hardreset);
static int ahci_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
bool online;
return ahci_do_hardreset(link, class, deadline, &online);
}
static void ahci_postreset(struct ata_link *link, unsigned int *class)
{
struct ata_port *ap = link->ap;
void __iomem *port_mmio = ahci_port_base(ap);
u32 new_tmp, tmp;
ata_std_postreset(link, class);
/* Make sure port's ATAPI bit is set appropriately */
new_tmp = tmp = readl(port_mmio + PORT_CMD);
if (*class == ATA_DEV_ATAPI)
new_tmp |= PORT_CMD_ATAPI;
else
new_tmp &= ~PORT_CMD_ATAPI;
if (new_tmp != tmp) {
writel(new_tmp, port_mmio + PORT_CMD);
readl(port_mmio + PORT_CMD); /* flush */
}
}
static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
{
struct scatterlist *sg;
struct ahci_sg *ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
unsigned int si;
VPRINTK("ENTER\n");
/*
* Next, the S/G list.
*/
for_each_sg(qc->sg, sg, qc->n_elem, si) {
dma_addr_t addr = sg_dma_address(sg);
u32 sg_len = sg_dma_len(sg);
ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
ahci_sg[si].flags_size = cpu_to_le32(sg_len - 1);
}
return si;
}
static int ahci_pmp_qc_defer(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ahci_port_priv *pp = ap->private_data;
if (!sata_pmp_attached(ap) || pp->fbs_enabled)
return ata_std_qc_defer(qc);
else
return sata_pmp_qc_defer_cmd_switch(qc);
}
static enum ata_completion_errors ahci_qc_prep(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ahci_port_priv *pp = ap->private_data;
int is_atapi = ata_is_atapi(qc->tf.protocol);
void *cmd_tbl;
u32 opts;
const u32 cmd_fis_len = 5; /* five dwords */
unsigned int n_elem;
/*
* Fill in command table information. First, the header,
* a SATA Register - Host to Device command FIS.
*/
cmd_tbl = pp->cmd_tbl + qc->hw_tag * AHCI_CMD_TBL_SZ;
ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
if (is_atapi) {
memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
}
n_elem = 0;
if (qc->flags & ATA_QCFLAG_DMAMAP)
n_elem = ahci_fill_sg(qc, cmd_tbl);
/*
* Fill in command slot information.
*/
opts = cmd_fis_len | n_elem << 16 | (qc->dev->link->pmp << 12);
if (qc->tf.flags & ATA_TFLAG_WRITE)
opts |= AHCI_CMD_WRITE;
if (is_atapi)
opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
ahci_fill_cmd_slot(pp, qc->hw_tag, opts);
return AC_ERR_OK;
}
static void ahci_fbs_dec_intr(struct ata_port *ap)
{
struct ahci_port_priv *pp = ap->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
u32 fbs = readl(port_mmio + PORT_FBS);
int retries = 3;
DPRINTK("ENTER\n");
BUG_ON(!pp->fbs_enabled);
/* time to wait for DEC is not specified by AHCI spec,
* add a retry loop for safety.
*/
writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
fbs = readl(port_mmio + PORT_FBS);
while ((fbs & PORT_FBS_DEC) && retries--) {
udelay(1);
fbs = readl(port_mmio + PORT_FBS);
}
if (fbs & PORT_FBS_DEC)
dev_err(ap->host->dev, "failed to clear device error\n");
}
static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
struct ata_eh_info *host_ehi = &ap->link.eh_info;
struct ata_link *link = NULL;
struct ata_queued_cmd *active_qc;
struct ata_eh_info *active_ehi;
bool fbs_need_dec = false;
u32 serror;
/* determine active link with error */
if (pp->fbs_enabled) {
void __iomem *port_mmio = ahci_port_base(ap);
u32 fbs = readl(port_mmio + PORT_FBS);
int pmp = fbs >> PORT_FBS_DWE_OFFSET;
if ((fbs & PORT_FBS_SDE) && (pmp < ap->nr_pmp_links)) {
link = &ap->pmp_link[pmp];
fbs_need_dec = true;
}
} else
ata_for_each_link(link, ap, EDGE)
if (ata_link_active(link))
break;
if (!link)
link = &ap->link;
active_qc = ata_qc_from_tag(ap, link->active_tag);
active_ehi = &link->eh_info;
/* record irq stat */
ata_ehi_clear_desc(host_ehi);
ata_ehi_push_desc(host_ehi, "irq_stat 0x%08x", irq_stat);
/* AHCI needs SError cleared; otherwise, it might lock up */
ahci_scr_read(&ap->link, SCR_ERROR, &serror);
ahci_scr_write(&ap->link, SCR_ERROR, serror);
host_ehi->serror |= serror;
/* some controllers set IRQ_IF_ERR on device errors, ignore it */
if (hpriv->flags & AHCI_HFLAG_IGN_IRQ_IF_ERR)
irq_stat &= ~PORT_IRQ_IF_ERR;
if (irq_stat & PORT_IRQ_TF_ERR) {
/* If qc is active, charge it; otherwise, the active
* link. There's no active qc on NCQ errors. It will
* be determined by EH by reading log page 10h.
*/
if (active_qc)
active_qc->err_mask |= AC_ERR_DEV;
else
active_ehi->err_mask |= AC_ERR_DEV;
if (hpriv->flags & AHCI_HFLAG_IGN_SERR_INTERNAL)
host_ehi->serror &= ~SERR_INTERNAL;
}
if (irq_stat & PORT_IRQ_UNK_FIS) {
u32 *unk = pp->rx_fis + RX_FIS_UNK;
active_ehi->err_mask |= AC_ERR_HSM;
active_ehi->action |= ATA_EH_RESET;
ata_ehi_push_desc(active_ehi,
"unknown FIS %08x %08x %08x %08x" ,
unk[0], unk[1], unk[2], unk[3]);
}
if (sata_pmp_attached(ap) && (irq_stat & PORT_IRQ_BAD_PMP)) {
active_ehi->err_mask |= AC_ERR_HSM;
active_ehi->action |= ATA_EH_RESET;
ata_ehi_push_desc(active_ehi, "incorrect PMP");
}
if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
host_ehi->err_mask |= AC_ERR_HOST_BUS;
host_ehi->action |= ATA_EH_RESET;
ata_ehi_push_desc(host_ehi, "host bus error");
}
if (irq_stat & PORT_IRQ_IF_ERR) {
if (fbs_need_dec)
active_ehi->err_mask |= AC_ERR_DEV;
else {
host_ehi->err_mask |= AC_ERR_ATA_BUS;
host_ehi->action |= ATA_EH_RESET;
}
ata_ehi_push_desc(host_ehi, "interface fatal error");
}
if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
ata_ehi_hotplugged(host_ehi);
ata_ehi_push_desc(host_ehi, "%s",
irq_stat & PORT_IRQ_CONNECT ?
"connection status changed" : "PHY RDY changed");
}
/* okay, let's hand over to EH */
if (irq_stat & PORT_IRQ_FREEZE)
ata_port_freeze(ap);
else if (fbs_need_dec) {
ata_link_abort(link);
ahci_fbs_dec_intr(ap);
} else
ata_port_abort(ap);
}
static void ahci_handle_port_interrupt(struct ata_port *ap,
void __iomem *port_mmio, u32 status)
{
struct ata_eh_info *ehi = &ap->link.eh_info;
struct ahci_port_priv *pp = ap->private_data;
struct ahci_host_priv *hpriv = ap->host->private_data;
int resetting = !!(ap->pflags & ATA_PFLAG_RESETTING);
u32 qc_active = 0;
int rc;
/* ignore BAD_PMP while resetting */
if (unlikely(resetting))
status &= ~PORT_IRQ_BAD_PMP;
if (sata_lpm_ignore_phy_events(&ap->link)) {
status &= ~PORT_IRQ_PHYRDY;
ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
}
if (unlikely(status & PORT_IRQ_ERROR)) {
ahci_error_intr(ap, status);
return;
}
if (status & PORT_IRQ_SDB_FIS) {
/* If SNotification is available, leave notification
* handling to sata_async_notification(). If not,
* emulate it by snooping SDB FIS RX area.
*
* Snooping FIS RX area is probably cheaper than
* poking SNotification but some constrollers which
* implement SNotification, ICH9 for example, don't
* store AN SDB FIS into receive area.
*/
if (hpriv->cap & HOST_CAP_SNTF)
sata_async_notification(ap);
else {
/* If the 'N' bit in word 0 of the FIS is set,
* we just received asynchronous notification.
* Tell libata about it.
*
* Lack of SNotification should not appear in
* ahci 1.2, so the workaround is unnecessary
* when FBS is enabled.
*/
if (pp->fbs_enabled)
WARN_ON_ONCE(1);
else {
const __le32 *f = pp->rx_fis + RX_FIS_SDB;
u32 f0 = le32_to_cpu(f[0]);
if (f0 & (1 << 15))
sata_async_notification(ap);
}
}
}
/* pp->active_link is not reliable once FBS is enabled, both
* PORT_SCR_ACT and PORT_CMD_ISSUE should be checked because
* NCQ and non-NCQ commands may be in flight at the same time.
*/
if (pp->fbs_enabled) {
if (ap->qc_active) {
qc_active = readl(port_mmio + PORT_SCR_ACT);
qc_active |= readl(port_mmio + PORT_CMD_ISSUE);
}
} else {
/* pp->active_link is valid iff any command is in flight */
if (ap->qc_active && pp->active_link->sactive)
qc_active = readl(port_mmio + PORT_SCR_ACT);
else
qc_active = readl(port_mmio + PORT_CMD_ISSUE);
}
rc = ata_qc_complete_multiple(ap, qc_active);
/* while resetting, invalid completions are expected */
if (unlikely(rc < 0 && !resetting)) {
ehi->err_mask |= AC_ERR_HSM;
ehi->action |= ATA_EH_RESET;
ata_port_freeze(ap);
}
}
static void ahci_port_intr(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
u32 status;
status = readl(port_mmio + PORT_IRQ_STAT);
writel(status, port_mmio + PORT_IRQ_STAT);
ahci_handle_port_interrupt(ap, port_mmio, status);
}
static irqreturn_t ahci_multi_irqs_intr_hard(int irq, void *dev_instance)
{
struct ata_port *ap = dev_instance;
void __iomem *port_mmio = ahci_port_base(ap);
u32 status;
VPRINTK("ENTER\n");
status = readl(port_mmio + PORT_IRQ_STAT);
writel(status, port_mmio + PORT_IRQ_STAT);
spin_lock(ap->lock);
ahci_handle_port_interrupt(ap, port_mmio, status);
spin_unlock(ap->lock);
VPRINTK("EXIT\n");
return IRQ_HANDLED;
}
u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
{
unsigned int i, handled = 0;
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap;
if (!(irq_masked & (1 << i)))
continue;
ap = host->ports[i];
if (ap) {
ahci_port_intr(ap);
VPRINTK("port %u\n", i);
} else {
VPRINTK("port %u (no irq)\n", i);
if (ata_ratelimit())
dev_warn(host->dev,
"interrupt on disabled port %u\n", i);
}
handled = 1;
}
return handled;
}
EXPORT_SYMBOL_GPL(ahci_handle_port_intr);
static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance)
{
struct ata_host *host = dev_instance;
struct ahci_host_priv *hpriv;
unsigned int rc = 0;
void __iomem *mmio;
u32 irq_stat, irq_masked;
VPRINTK("ENTER\n");
hpriv = host->private_data;
mmio = hpriv->mmio;
/* sigh. 0xffffffff is a valid return from h/w */
irq_stat = readl(mmio + HOST_IRQ_STAT);
if (!irq_stat)
return IRQ_NONE;
irq_masked = irq_stat & hpriv->port_map;
spin_lock(&host->lock);
rc = ahci_handle_port_intr(host, irq_masked);
/* HOST_IRQ_STAT behaves as level triggered latch meaning that
* it should be cleared after all the port events are cleared;
* otherwise, it will raise a spurious interrupt after each
* valid one. Please read section 10.6.2 of ahci 1.1 for more
* information.
*
* Also, use the unmasked value to clear interrupt as spurious
* pending event on a dummy port might cause screaming IRQ.
*/
writel(irq_stat, mmio + HOST_IRQ_STAT);
spin_unlock(&host->lock);
VPRINTK("EXIT\n");
return IRQ_RETVAL(rc);
}
unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
void __iomem *port_mmio = ahci_port_base(ap);
struct ahci_port_priv *pp = ap->private_data;
/* Keep track of the currently active link. It will be used
* in completion path to determine whether NCQ phase is in
* progress.
*/
pp->active_link = qc->dev->link;
if (ata_is_ncq(qc->tf.protocol))
writel(1 << qc->hw_tag, port_mmio + PORT_SCR_ACT);
if (pp->fbs_enabled && pp->fbs_last_dev != qc->dev->link->pmp) {
u32 fbs = readl(port_mmio + PORT_FBS);
fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
fbs |= qc->dev->link->pmp << PORT_FBS_DEV_OFFSET;
writel(fbs, port_mmio + PORT_FBS);
pp->fbs_last_dev = qc->dev->link->pmp;
}
writel(1 << qc->hw_tag, port_mmio + PORT_CMD_ISSUE);
ahci_sw_activity(qc->dev->link);
return 0;
}
EXPORT_SYMBOL_GPL(ahci_qc_issue);
static bool ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
{
struct ahci_port_priv *pp = qc->ap->private_data;
u8 *rx_fis = pp->rx_fis;
if (pp->fbs_enabled)
rx_fis += qc->dev->link->pmp * AHCI_RX_FIS_SZ;
/*
* After a successful execution of an ATA PIO data-in command,
* the device doesn't send D2H Reg FIS to update the TF and
* the host should take TF and E_Status from the preceding PIO
* Setup FIS.
*/
if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
!(qc->flags & ATA_QCFLAG_FAILED)) {
ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
} else
ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);
return true;
}
static void ahci_freeze(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
/* turn IRQ off */
writel(0, port_mmio + PORT_IRQ_MASK);
}
static void ahci_thaw(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *mmio = hpriv->mmio;
void __iomem *port_mmio = ahci_port_base(ap);
u32 tmp;
struct ahci_port_priv *pp = ap->private_data;
/* clear IRQ */
tmp = readl(port_mmio + PORT_IRQ_STAT);
writel(tmp, port_mmio + PORT_IRQ_STAT);
writel(1 << ap->port_no, mmio + HOST_IRQ_STAT);
/* turn IRQ back on */
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
}
void ahci_error_handler(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
/* restart engine */
hpriv->stop_engine(ap);
hpriv->start_engine(ap);
}
sata_pmp_error_handler(ap);
if (!ata_dev_enabled(ap->link.device))
hpriv->stop_engine(ap);
}
EXPORT_SYMBOL_GPL(ahci_error_handler);
static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
/* make DMA engine forget about the failed command */
if (qc->flags & ATA_QCFLAG_FAILED)
ahci_kick_engine(ap);
}
static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
struct ata_device *dev = ap->link.device;
u32 devslp, dm, dito, mdat, deto, dito_conf;
int rc;
unsigned int err_mask;
devslp = readl(port_mmio + PORT_DEVSLP);
if (!(devslp & PORT_DEVSLP_DSP)) {
dev_info(ap->host->dev, "port does not support device sleep\n");
return;
}
/* disable device sleep */
if (!sleep) {
if (devslp & PORT_DEVSLP_ADSE) {
writel(devslp & ~PORT_DEVSLP_ADSE,
port_mmio + PORT_DEVSLP);
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_DISABLE,
SATA_DEVSLP);
if (err_mask && err_mask != AC_ERR_DEV)
ata_dev_warn(dev, "failed to disable DEVSLP\n");
}
return;
}
dm = (devslp & PORT_DEVSLP_DM_MASK) >> PORT_DEVSLP_DM_OFFSET;
dito = devslp_idle_timeout / (dm + 1);
if (dito > 0x3ff)
dito = 0x3ff;
dito_conf = (devslp >> PORT_DEVSLP_DITO_OFFSET) & 0x3FF;
/* device sleep was already enabled and same dito */
if ((devslp & PORT_DEVSLP_ADSE) && (dito_conf == dito))
return;
/* set DITO, MDAT, DETO and enable DevSlp, need to stop engine first */
rc = hpriv->stop_engine(ap);
if (rc)
return;
/* Use the nominal value 10 ms if the read MDAT is zero,
* the nominal value of DETO is 20 ms.
*/
if (dev->devslp_timing[ATA_LOG_DEVSLP_VALID] &
ATA_LOG_DEVSLP_VALID_MASK) {
mdat = dev->devslp_timing[ATA_LOG_DEVSLP_MDAT] &
ATA_LOG_DEVSLP_MDAT_MASK;
if (!mdat)
mdat = 10;
deto = dev->devslp_timing[ATA_LOG_DEVSLP_DETO];
if (!deto)
deto = 20;
} else {
mdat = 10;
deto = 20;
}
/* Make dito, mdat, deto bits to 0s */
devslp &= ~GENMASK_ULL(24, 2);
devslp |= ((dito << PORT_DEVSLP_DITO_OFFSET) |
(mdat << PORT_DEVSLP_MDAT_OFFSET) |
(deto << PORT_DEVSLP_DETO_OFFSET) |
PORT_DEVSLP_ADSE);
writel(devslp, port_mmio + PORT_DEVSLP);
hpriv->start_engine(ap);
/* enable device sleep feature for the drive */
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_ENABLE,
SATA_DEVSLP);
if (err_mask && err_mask != AC_ERR_DEV)
ata_dev_warn(dev, "failed to enable DEVSLP\n");
}
static void ahci_enable_fbs(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
u32 fbs;
int rc;
if (!pp->fbs_supported)
return;
fbs = readl(port_mmio + PORT_FBS);
if (fbs & PORT_FBS_EN) {
pp->fbs_enabled = true;
pp->fbs_last_dev = -1; /* initialization */
return;
}
rc = hpriv->stop_engine(ap);
if (rc)
return;
writel(fbs | PORT_FBS_EN, port_mmio + PORT_FBS);
fbs = readl(port_mmio + PORT_FBS);
if (fbs & PORT_FBS_EN) {
dev_info(ap->host->dev, "FBS is enabled\n");
pp->fbs_enabled = true;
pp->fbs_last_dev = -1; /* initialization */
} else
dev_err(ap->host->dev, "Failed to enable FBS\n");
hpriv->start_engine(ap);
}
static void ahci_disable_fbs(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
struct ahci_port_priv *pp = ap->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
u32 fbs;
int rc;
if (!pp->fbs_supported)
return;
fbs = readl(port_mmio + PORT_FBS);
if ((fbs & PORT_FBS_EN) == 0) {
pp->fbs_enabled = false;
return;
}
rc = hpriv->stop_engine(ap);
if (rc)
return;
writel(fbs & ~PORT_FBS_EN, port_mmio + PORT_FBS);
fbs = readl(port_mmio + PORT_FBS);
if (fbs & PORT_FBS_EN)
dev_err(ap->host->dev, "Failed to disable FBS\n");
else {
dev_info(ap->host->dev, "FBS is disabled\n");
pp->fbs_enabled = false;
}
hpriv->start_engine(ap);
}
static void ahci_pmp_attach(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
struct ahci_port_priv *pp = ap->private_data;
u32 cmd;
cmd = readl(port_mmio + PORT_CMD);
cmd |= PORT_CMD_PMP;
writel(cmd, port_mmio + PORT_CMD);
ahci_enable_fbs(ap);
pp->intr_mask |= PORT_IRQ_BAD_PMP;
/*
* We must not change the port interrupt mask register if the
* port is marked frozen, the value in pp->intr_mask will be
* restored later when the port is thawed.
*
* Note that during initialization, the port is marked as
* frozen since the irq handler is not yet registered.
*/
if (!(ap->pflags & ATA_PFLAG_FROZEN))
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
}
static void ahci_pmp_detach(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
struct ahci_port_priv *pp = ap->private_data;
u32 cmd;
ahci_disable_fbs(ap);
cmd = readl(port_mmio + PORT_CMD);
cmd &= ~PORT_CMD_PMP;
writel(cmd, port_mmio + PORT_CMD);
pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
/* see comment above in ahci_pmp_attach() */
if (!(ap->pflags & ATA_PFLAG_FROZEN))
writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
}
int ahci_port_resume(struct ata_port *ap)
{
ahci_rpm_get_port(ap);
ahci_power_up(ap);
ahci_start_port(ap);
if (sata_pmp_attached(ap))
ahci_pmp_attach(ap);
else
ahci_pmp_detach(ap);
return 0;
}
EXPORT_SYMBOL_GPL(ahci_port_resume);
#ifdef CONFIG_PM
static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
{
const char *emsg = NULL;
int rc;
rc = ahci_deinit_port(ap, &emsg);
if (rc == 0)
ahci_power_down(ap);
else {
ata_port_err(ap, "%s (%d)\n", emsg, rc);
ata_port_freeze(ap);
}
ahci_rpm_put_port(ap);
return rc;
}
#endif
static int ahci_port_start(struct ata_port *ap)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
struct device *dev = ap->host->dev;
struct ahci_port_priv *pp;
void *mem;
dma_addr_t mem_dma;
size_t dma_sz, rx_fis_sz;
pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
if (!pp)
return -ENOMEM;
if (ap->host->n_ports > 1) {
pp->irq_desc = devm_kzalloc(dev, 8, GFP_KERNEL);
if (!pp->irq_desc) {
devm_kfree(dev, pp);
return -ENOMEM;
}
snprintf(pp->irq_desc, 8,
"%s%d", dev_driver_string(dev), ap->port_no);
}
/* check FBS capability */
if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
void __iomem *port_mmio = ahci_port_base(ap);
u32 cmd = readl(port_mmio + PORT_CMD);
if (cmd & PORT_CMD_FBSCP)
pp->fbs_supported = true;
else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
ap->port_no);
pp->fbs_supported = true;
} else
dev_warn(dev, "port %d is not capable of FBS\n",
ap->port_no);
}
if (pp->fbs_supported) {
dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
rx_fis_sz = AHCI_RX_FIS_SZ * 16;
} else {
dma_sz = AHCI_PORT_PRIV_DMA_SZ;
rx_fis_sz = AHCI_RX_FIS_SZ;
}
mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
if (!mem)
return -ENOMEM;
/*
* First item in chunk of DMA memory: 32-slot command table,
* 32 bytes each in size
*/
pp->cmd_slot = mem;
pp->cmd_slot_dma = mem_dma;
mem += AHCI_CMD_SLOT_SZ;
mem_dma += AHCI_CMD_SLOT_SZ;
/*
* Second item: Received-FIS area
*/
pp->rx_fis = mem;
pp->rx_fis_dma = mem_dma;
mem += rx_fis_sz;
mem_dma += rx_fis_sz;
/*
* Third item: data area for storing a single command
* and its scatter-gather table
*/
pp->cmd_tbl = mem;
pp->cmd_tbl_dma = mem_dma;
/*
* Save off initial list of interrupts to be enabled.
* This could be changed later
*/
pp->intr_mask = DEF_PORT_IRQ;
/*
* Switch to per-port locking in case each port has its own MSI vector.
*/
if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
spin_lock_init(&pp->lock);
ap->lock = &pp->lock;
}
ap->private_data = pp;
/* engage engines, captain */
return ahci_port_resume(ap);
}
static void ahci_port_stop(struct ata_port *ap)
{
const char *emsg = NULL;
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *host_mmio = hpriv->mmio;
int rc;
/* de-initialize port */
rc = ahci_deinit_port(ap, &emsg);
if (rc)
ata_port_warn(ap, "%s (%d)\n", emsg, rc);
/*
* Clear GHC.IS to prevent stuck INTx after disabling MSI and
* re-enabling INTx.
*/
writel(1 << ap->port_no, host_mmio + HOST_IRQ_STAT);
ahci_rpm_put_port(ap);
}
void ahci_print_info(struct ata_host *host, const char *scc_s)
{
struct ahci_host_priv *hpriv = host->private_data;
u32 vers, cap, cap2, impl, speed;
const char *speed_s;
vers = hpriv->version;
cap = hpriv->cap;
cap2 = hpriv->cap2;
impl = hpriv->port_map;
speed = (cap >> 20) & 0xf;
if (speed == 1)
speed_s = "1.5";
else if (speed == 2)
speed_s = "3";
else if (speed == 3)
speed_s = "6";
else
speed_s = "?";
dev_info(host->dev,
"AHCI %02x%02x.%02x%02x "
"%u slots %u ports %s Gbps 0x%x impl %s mode\n"
,
(vers >> 24) & 0xff,
(vers >> 16) & 0xff,
(vers >> 8) & 0xff,
vers & 0xff,
((cap >> 8) & 0x1f) + 1,
(cap & 0x1f) + 1,
speed_s,
impl,
scc_s);
dev_info(host->dev,
"flags: "
"%s%s%s%s%s%s%s"
"%s%s%s%s%s%s%s"
"%s%s%s%s%s%s%s"
"%s%s\n"
,
cap & HOST_CAP_64 ? "64bit " : "",
cap & HOST_CAP_NCQ ? "ncq " : "",
cap & HOST_CAP_SNTF ? "sntf " : "",
cap & HOST_CAP_MPS ? "ilck " : "",
cap & HOST_CAP_SSS ? "stag " : "",
cap & HOST_CAP_ALPM ? "pm " : "",
cap & HOST_CAP_LED ? "led " : "",
cap & HOST_CAP_CLO ? "clo " : "",
cap & HOST_CAP_ONLY ? "only " : "",
cap & HOST_CAP_PMP ? "pmp " : "",
cap & HOST_CAP_FBS ? "fbs " : "",
cap & HOST_CAP_PIO_MULTI ? "pio " : "",
cap & HOST_CAP_SSC ? "slum " : "",
cap & HOST_CAP_PART ? "part " : "",
cap & HOST_CAP_CCC ? "ccc " : "",
cap & HOST_CAP_EMS ? "ems " : "",
cap & HOST_CAP_SXS ? "sxs " : "",
cap2 & HOST_CAP2_DESO ? "deso " : "",
cap2 & HOST_CAP2_SADM ? "sadm " : "",
cap2 & HOST_CAP2_SDS ? "sds " : "",
cap2 & HOST_CAP2_APST ? "apst " : "",
cap2 & HOST_CAP2_NVMHCI ? "nvmp " : "",
cap2 & HOST_CAP2_BOH ? "boh " : ""
);
}
EXPORT_SYMBOL_GPL(ahci_print_info);
void ahci_set_em_messages(struct ahci_host_priv *hpriv,
struct ata_port_info *pi)
{
u8 messages;
void __iomem *mmio = hpriv->mmio;
u32 em_loc = readl(mmio + HOST_EM_LOC);
u32 em_ctl = readl(mmio + HOST_EM_CTL);
if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS))
return;
messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16;
if (messages) {
/* store em_loc */
hpriv->em_loc = ((em_loc >> 16) * 4);
hpriv->em_buf_sz = ((em_loc & 0xff) * 4);
hpriv->em_msg_type = messages;
pi->flags |= ATA_FLAG_EM;
if (!(em_ctl & EM_CTL_ALHD))
pi->flags |= ATA_FLAG_SW_ACTIVITY;
}
}
EXPORT_SYMBOL_GPL(ahci_set_em_messages);
static int ahci_host_activate_multi_irqs(struct ata_host *host,
struct scsi_host_template *sht)
{
struct ahci_host_priv *hpriv = host->private_data;
int i, rc;
rc = ata_host_start(host);
if (rc)
return rc;
/*
* Requests IRQs according to AHCI-1.1 when multiple MSIs were
* allocated. That is one MSI per port, starting from @irq.
*/
for (i = 0; i < host->n_ports; i++) {
struct ahci_port_priv *pp = host->ports[i]->private_data;
int irq = hpriv->get_irq_vector(host, i);
/* Do not receive interrupts sent by dummy ports */
if (!pp) {
disable_irq(irq);
continue;
}
rc = devm_request_irq(host->dev, irq, ahci_multi_irqs_intr_hard,
0, pp->irq_desc, host->ports[i]);
if (rc)
return rc;
ata_port_desc(host->ports[i], "irq %d", irq);
}
return ata_host_register(host, sht);
}
/**
* ahci_host_activate - start AHCI host, request IRQs and register it
* @host: target ATA host
* @sht: scsi_host_template to use when registering the host
*
* LOCKING:
* Inherited from calling layer (may sleep).
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht)
{
struct ahci_host_priv *hpriv = host->private_data;
int irq = hpriv->irq;
int rc;
if (hpriv->flags & AHCI_HFLAG_MULTI_MSI) {
if (hpriv->irq_handler &&
hpriv->irq_handler != ahci_single_level_irq_intr)
dev_warn(host->dev,
"both AHCI_HFLAG_MULTI_MSI flag set and custom irq handler implemented\n");
if (!hpriv->get_irq_vector) {
dev_err(host->dev,
"AHCI_HFLAG_MULTI_MSI requires ->get_irq_vector!\n");
return -EIO;
}
rc = ahci_host_activate_multi_irqs(host, sht);
} else {
rc = ata_host_activate(host, irq, hpriv->irq_handler,
IRQF_SHARED, sht);
}
return rc;
}
EXPORT_SYMBOL_GPL(ahci_host_activate);
MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Common AHCI SATA low-level routines");
MODULE_LICENSE("GPL");
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