Add quick for bronken ncq. The chipsets (eg. BCM7439A0, BCM7445A0 and
BCM7445B0) need a workaround disabling NCQ. and it may need the
MIPS-based set-top box platforms.
Signed-off-by: Jaedon Shin <jaedon.s...@gmail.com>
---
.../devicetree/bindings/ata/brcm,sata-brcmstb.txt | 3 ++
drivers/ata/ahci_brcmstb.c | 42 ++++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/Documentation/devicetree/bindings/ata/brcm,sata-brcmstb.txt
b/Documentation/devicetree/bindings/ata/brcm,sata-brcmstb.txt
index 20ac9bbfa1fd..4650c0aff6b3 100644
--- a/Documentation/devicetree/bindings/ata/brcm,sata-brcmstb.txt
+++ b/Documentation/devicetree/bindings/ata/brcm,sata-brcmstb.txt
@@ -10,6 +10,9 @@ Required properties:
- reg-names : "ahci" and "top-ctrl"
- interrupts : interrupt mapping for SATA IRQ
+Optional properties:
+- brcm,broken-ncq : if present, NCQ is unusable
+
Also see ahci-platform.txt.
Example:
diff --git a/drivers/ata/ahci_brcmstb.c b/drivers/ata/ahci_brcmstb.c
index 14b7305d2ba0..a2df76698adb 100644
--- a/drivers/ata/ahci_brcmstb.c
+++ b/drivers/ata/ahci_brcmstb.c
@@ -69,10 +69,15 @@
(DATA_ENDIAN << DMADESC_ENDIAN_SHIFT) | \
(MMIO_ENDIAN << MMIO_ENDIAN_SHIFT))
+enum brcm_ahci_quicks {
+ BRCM_AHCI_QUICK_NONCQ = BIT(0),
+};
+
struct brcm_ahci_priv {
struct device *dev;
void __iomem *top_ctrl;
u32 port_mask;
+ u32 quicks;
};
static const struct ata_port_info ahci_brcm_port_info = {
@@ -209,6 +214,39 @@ static void brcm_sata_init(struct brcm_ahci_priv *priv)
priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL);
}
+static void brcm_sata_quick(struct platform_device *pdev,
+ struct brcm_ahci_priv *priv)
+{
+ void __iomem *ahci;
+ struct resource *res;
+ u32 reg;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ahci");
+ ahci = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(ahci))
+ return;
+
+ if (priv->quicks & BRCM_AHCI_QUICK_NONCQ) {
+ reg = readl(priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL);
+ reg |= OVERRIDE_HWINIT;
+ writel(reg, priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL);
+
+ /* Clear out the NCQ bit so the AHCI driver will not issue
+ * FPDMA/NCQ commands.
+ */
+ reg = readl(ahci + HOST_CAP);
+ reg &= ~HOST_CAP_NCQ;
+ writel(reg, ahci + HOST_CAP);
+
+ reg = readl(priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL);
+ reg &= ~OVERRIDE_HWINIT;
+ writel(reg, priv->top_ctrl + SATA_TOP_CTRL_BUS_CTRL);
+ }
+
+ devm_iounmap(&pdev->dev, ahci);
+ devm_release_mem_region(&pdev->dev, res->start, resource_size(res));
+}
+
#ifdef CONFIG_PM_SLEEP
static int brcm_ahci_suspend(struct device *dev)
{
@@ -256,7 +294,11 @@ static int brcm_ahci_probe(struct platform_device *pdev)
if (IS_ERR(priv->top_ctrl))
return PTR_ERR(priv->top_ctrl);
+ if (of_property_read_bool(dev->of_node, "brcm,broken-ncq"))
+ priv->quicks |= BRCM_AHCI_QUICK_NONCQ;
+
brcm_sata_init(priv);
+ brcm_sata_quick(pdev, priv);
priv->port_mask = brcm_ahci_get_portmask(pdev, priv);
if (!priv->port_mask)
--
2.6.2
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