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223 lines
7.3 KiB
Diff
223 lines
7.3 KiB
Diff
From 9b10bc9f84fc221fcef9ddca92972af9b442f49d Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Mon, 2 Dec 2013 16:13:32 +0100
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Subject: [PATCH] libahci: Allow drivers to override start_engine
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Allwinner A10 and A20 ARM SoCs have an AHCI sata controller which needs a
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special register to be poked before starting the DMA engine.
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This register gets reset on an ahci_stop_engine call, so there is no other
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place then ahci_start_engine where this poking can be done.
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This commit allows drivers to override ahci_start_engine behavior for use by
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the Allwinner AHCI driver (and potentially other drivers in the future).
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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drivers/ata/ahci.c | 6 ++++--
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drivers/ata/ahci.h | 6 ++++++
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drivers/ata/libahci.c | 26 +++++++++++++++++++-------
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drivers/ata/sata_highbank.c | 3 ++-
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4 files changed, 31 insertions(+), 10 deletions(-)
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diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
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index dc2756f..eda68b4 100644
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--- a/drivers/ata/ahci.c
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+++ b/drivers/ata/ahci.c
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@@ -564,6 +564,7 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
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unsigned long deadline)
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{
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struct ata_port *ap = link->ap;
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+ struct ahci_host_priv *hpriv = ap->host->private_data;
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bool online;
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int rc;
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@@ -574,7 +575,7 @@ static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
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rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
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deadline, &online, NULL);
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
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@@ -589,6 +590,7 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
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{
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struct ata_port *ap = link->ap;
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struct ahci_port_priv *pp = ap->private_data;
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+ struct ahci_host_priv *hpriv = ap->host->private_data;
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u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
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struct ata_taskfile tf;
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bool online;
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@@ -604,7 +606,7 @@ static int ahci_p5wdh_hardreset(struct ata_link *link, unsigned int *class,
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rc = sata_link_hardreset(link, sata_ehc_deb_timing(&link->eh_context),
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deadline, &online, NULL);
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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/* The pseudo configuration device on SIMG4726 attached to
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* ASUS P5W-DH Deluxe doesn't send signature FIS after
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diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
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index 2289efd..64d1a99d 100644
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--- a/drivers/ata/ahci.h
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+++ b/drivers/ata/ahci.h
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@@ -323,6 +323,12 @@ struct ahci_host_priv {
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u32 em_msg_type; /* EM message type */
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struct clk *clk; /* Only for platforms supporting clk */
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void *plat_data; /* Other platform data */
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+ /*
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+ * Optional ahci_start_engine override, if not set this gets set to the
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+ * default ahci_start_engine during ahci_save_initial_config, this can
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+ * be overridden anytime before the host is activated.
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+ */
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+ void (*start_engine)(struct ata_port *ap);
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};
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extern int ahci_ignore_sss;
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diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
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index 36605ab..f839bb3 100644
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--- a/drivers/ata/libahci.c
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+++ b/drivers/ata/libahci.c
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@@ -394,6 +394,9 @@ static ssize_t ahci_show_em_supported(struct device *dev,
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*
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* If inconsistent, config values are fixed up by this function.
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*
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+ * If it is not set already this function sets hpriv->start_engine to
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+ * ahci_start_engine.
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+ *
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* LOCKING:
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* None.
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*/
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@@ -500,6 +503,9 @@ void ahci_save_initial_config(struct device *dev,
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hpriv->cap = cap;
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hpriv->cap2 = cap2;
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hpriv->port_map = port_map;
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+
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+ if (!hpriv->start_engine)
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+ hpriv->start_engine = ahci_start_engine;
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}
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EXPORT_SYMBOL_GPL(ahci_save_initial_config);
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@@ -766,7 +772,7 @@ static void ahci_start_port(struct ata_port *ap)
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/* enable DMA */
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if (!(hpriv->flags & AHCI_HFLAG_DELAY_ENGINE))
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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/* turn on LEDs */
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if (ap->flags & ATA_FLAG_EM) {
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@@ -1234,7 +1240,7 @@ int ahci_kick_engine(struct ata_port *ap)
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/* restart engine */
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out_restart:
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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return rc;
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}
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EXPORT_SYMBOL_GPL(ahci_kick_engine);
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@@ -1426,6 +1432,7 @@ static int ahci_hardreset(struct ata_link *link, unsigned int *class,
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const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
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struct ata_port *ap = link->ap;
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struct ahci_port_priv *pp = ap->private_data;
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+ struct ahci_host_priv *hpriv = ap->host->private_data;
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u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
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struct ata_taskfile tf;
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bool online;
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@@ -1443,7 +1450,7 @@ static int ahci_hardreset(struct ata_link *link, unsigned int *class,
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rc = sata_link_hardreset(link, timing, deadline, &online,
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ahci_check_ready);
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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if (online)
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*class = ahci_dev_classify(ap);
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@@ -2007,10 +2014,12 @@ static void ahci_thaw(struct ata_port *ap)
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void ahci_error_handler(struct ata_port *ap)
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{
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+ struct ahci_host_priv *hpriv = ap->host->private_data;
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+
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if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
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/* restart engine */
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ahci_stop_engine(ap);
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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}
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sata_pmp_error_handler(ap);
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@@ -2031,6 +2040,7 @@ static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
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static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
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{
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+ struct ahci_host_priv *hpriv = ap->host->private_data;
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void __iomem *port_mmio = ahci_port_base(ap);
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struct ata_device *dev = ap->link.device;
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u32 devslp, dm, dito, mdat, deto;
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@@ -2094,7 +2104,7 @@ static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
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PORT_DEVSLP_ADSE);
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writel(devslp, port_mmio + PORT_DEVSLP);
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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/* enable device sleep feature for the drive */
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err_mask = ata_dev_set_feature(dev,
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@@ -2106,6 +2116,7 @@ static void ahci_set_aggressive_devslp(struct ata_port *ap, bool sleep)
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static void ahci_enable_fbs(struct ata_port *ap)
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{
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+ struct ahci_host_priv *hpriv = ap->host->private_data;
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struct ahci_port_priv *pp = ap->private_data;
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void __iomem *port_mmio = ahci_port_base(ap);
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u32 fbs;
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@@ -2134,11 +2145,12 @@ static void ahci_enable_fbs(struct ata_port *ap)
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} else
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dev_err(ap->host->dev, "Failed to enable FBS\n");
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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}
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static void ahci_disable_fbs(struct ata_port *ap)
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{
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+ struct ahci_host_priv *hpriv = ap->host->private_data;
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struct ahci_port_priv *pp = ap->private_data;
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void __iomem *port_mmio = ahci_port_base(ap);
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u32 fbs;
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@@ -2166,7 +2178,7 @@ static void ahci_disable_fbs(struct ata_port *ap)
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pp->fbs_enabled = false;
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}
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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}
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static void ahci_pmp_attach(struct ata_port *ap)
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diff --git a/drivers/ata/sata_highbank.c b/drivers/ata/sata_highbank.c
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index 870b11e..b3b18d1 100644
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--- a/drivers/ata/sata_highbank.c
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+++ b/drivers/ata/sata_highbank.c
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@@ -403,6 +403,7 @@ static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
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static const unsigned long timing[] = { 5, 100, 500};
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struct ata_port *ap = link->ap;
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struct ahci_port_priv *pp = ap->private_data;
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+ struct ahci_host_priv *hpriv = ap->host->private_data;
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u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
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struct ata_taskfile tf;
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bool online;
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@@ -431,7 +432,7 @@ static int ahci_highbank_hardreset(struct ata_link *link, unsigned int *class,
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break;
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} while (!online && retry--);
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- ahci_start_engine(ap);
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+ hpriv->start_engine(ap);
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if (online)
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*class = ahci_dev_classify(ap);
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--
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1.8.5.5
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