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From 9b10bc9f84fc221fcef9ddca92972af9b442f49d Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Mon, 2 Dec 2013 16:13:32 +0100
Subject: [PATCH] libahci: Allow drivers to override start_engine
Allwinner A10 and A20 ARM SoCs have an AHCI sata controller which needs a
special register to be poked before starting the DMA engine.
This register gets reset on an ahci_stop_engine call, so there is no other
place then ahci_start_engine where this poking can be done.
This commit allows drivers to override ahci_start_engine behavior for use by
the Allwinner AHCI driver (and potentially other drivers in the future).
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/ata/ahci.c | 6 ++++--
drivers/ata/ahci.h | 6 ++++++
drivers/ata/libahci.c | 26 +++++++++++++++++++-------
drivers/ata/sata_highbank.c | 3 ++-
4 files changed, 31 insertions(+), 10 deletions(-)
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index dc2756f..eda68b4 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -564,6 +564,7 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
unsigned long deadline)
{
struct ata_port *ap = link->ap;
+ struct ahci_host_priv *hpriv = ap->host->private_data;
bool online;
int rc;
@@ -574,7 +575,7 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
deadline, &online, NULL);
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
@@ -589,6 +590,7 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
{
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;
bool online;
@@ -604,7 +606,7 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
deadline, &online, NULL);
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
/* The pseudo configuration device on SIMG4726 attached to
* ASUS P5W-DH Deluxe doesn't send signature FIS after
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 2289efd..64d1a99d 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -323,6 +323,12 @@ struct ahci_host_priv {
u32 em_msg_type; /* EM message type */
struct clk *clk; /* Only for platforms supporting clk */
void *plat_data; /* Other platform data */
+ /*
+ * Optional ahci_start_engine override, if not set this gets set to the
+ * default ahci_start_engine during ahci_save_initial_config, this can
+ * be overridden anytime before the host is activated.
+ */
+ void (*start_engine)(struct ata_port *ap);
};
extern int ahci_ignore_sss;
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 36605ab..f839bb3 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -394,6 +394,9 @@ static ssize_t ahci_show_em_supported(struct device *dev,
*
* 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.
*/
@@ -500,6 +503,9 @@ void ahci_save_initial_config(struct device *dev,
hpriv->cap = cap;
hpriv->cap2 = cap2;
hpriv->port_map = port_map;
+
+ if (!hpriv->start_engine)
+ hpriv->start_engine = ahci_start_engine;
}
EXPORT_SYMBOL_GPL(ahci_save_initial_config);
@@ -766,7 +772,7 @@ static void ahci_start_port(struct ata_port *ap)
/* enable DMA */
if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
/* turn on LEDs */
if (ap->flags & ATA_FLAG_EM) {
@@ -1234,7 +1240,7 @@ int ahci_kick_engine(struct ata_port *ap)
/* restart engine */
out_restart:
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
return rc;
}
EXPORT_SYMBOL_GPL(ahci_kick_engine);
@@ -1426,6 +1432,7 @@ static int ahci_hardreset(struct ata_link *link, unsigned int *class,
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;
bool online;
@@ -1443,7 +1450,7 @@ static int ahci_hardreset(struct ata_link *link, unsigned int *class,
rc = sata_link_hardreset(link, timing, deadline, &online,
ahci_check_ready);
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
if (online)
*class = ahci_dev_classify(ap);
@@ -2007,10 +2014,12 @@ static void ahci_thaw(struct ata_port *ap)
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 */
ahci_stop_engine(ap);
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
}
sata_pmp_error_handler(ap);
@@ -2031,6 +2040,7 @@ static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
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;
@@ -2094,7 +2104,7 @@ static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
PORT_DEVSLP_ADSE);
writel(devslp, port_mmio + PORT_DEVSLP);
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
/* enable device sleep feature for the drive */
err_mask = ata_dev_set_feature(dev,
@@ -2106,6 +2116,7 @@ static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
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;
@@ -2134,11 +2145,12 @@ static void ahci_enable_fbs(struct ata_port *ap)
} else
dev_err(ap->host->dev, "Failed to enable FBS\n");
- ahci_start_engine(ap);
+ 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;
@@ -2166,7 +2178,7 @@ static void ahci_disable_fbs(struct ata_port *ap)
pp->fbs_enabled = false;
}
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
}
static void ahci_pmp_attach(struct ata_port *ap)
diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c
index 870b11e..b3b18d1 100644
--- a/drivers/ata/sata_highbank.c
+++ b/drivers/ata/sata_highbank.c
@@ -403,6 +403,7 @@ static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
static const unsigned long timing[] = { 5, 100, 500};
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;
bool online;
@@ -431,7 +432,7 @@ static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
break;
} while (!online && retry--);
- ahci_start_engine(ap);
+ hpriv->start_engine(ap);
if (online)
*class = ahci_dev_classify(ap);
--
1.8.5.5
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