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Date: Tue, 24 Jun 2014 08:51:43 -0700
From: "Chen, Alvin" <alvin.chen@...el.com>
To: Alan Stern <stern@...land.harvard.edu>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
Boon Leong Ong <boon.leong.ong@...el.com>
Subject: [PATCH] USB: ehci-pci: USB host controller support for Intel Quark X1000
From: Bryan O'Donoghue <bryan.odonoghue@...el.com>
This patch is to enable USB host controller for Intel Quark X1000. Add pci quirks
to adjust the packet buffer in/out threshold value, and ensure EHCI packet buffer
i/o threshold value is reconfigured to half.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...el.com>
Signed-off-by: Alvin (Weike) Chen <alvin.chen@...el.com>
---
drivers/usb/host/ehci-pci.c | 4 ++++
drivers/usb/host/pci-quirks.c | 42 +++++++++++++++++++++++++++++++++++++++++
drivers/usb/host/pci-quirks.h | 2 ++
3 files changed, 48 insertions(+)
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 3e86bf4..33cfa23 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -50,6 +50,10 @@ static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
if (!retval)
ehci_dbg(ehci, "MWI active\n");
+ /* Reset the threshold limit */
+ if(unlikely(usb_is_intel_qrk(pdev)))
+ usb_set_qrk_bulk_thresh(pdev);
+
return 0;
}
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 00661d3..1ea8803 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -823,6 +823,48 @@ static int handshake(void __iomem *ptr, u32 mask, u32 done,
return -ETIMEDOUT;
}
+#define PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC 0x0939
+bool usb_is_intel_qrk(struct pci_dev *pdev)
+{
+ return pdev->vendor == PCI_VENDOR_ID_INTEL &&
+ pdev->device == PCI_DEVICE_ID_INTEL_QUARK_X1000_SOC;
+
+}
+EXPORT_SYMBOL_GPL(usb_is_intel_qrk);
+
+#define EHCI_INSNREG01 0x84
+#define EHCI_INSNREG01_THRESH 0x007F007F /* Threshold value */
+void usb_set_qrk_bulk_thresh(struct pci_dev *pdev)
+{
+ void __iomem *base, *op_reg_base;
+ u8 cap_length;
+ u32 val;
+
+ if (!mmio_resource_enabled(pdev, 0))
+ return;
+
+ base = pci_ioremap_bar(pdev, 0);
+ if (base == NULL)
+ return;
+
+ cap_length = readb(base);
+ op_reg_base = base + cap_length;
+
+ val = readl(op_reg_base + EHCI_INSNREG01);
+ dev_printk(KERN_INFO, &pdev->dev, "INSNREG01 is 0x%08x\n", val);
+
+ val = EHCI_INSNREG01_THRESH;
+
+ writel(val, op_reg_base + EHCI_INSNREG01);
+
+ val = readl(op_reg_base + EHCI_INSNREG01);
+ dev_printk(KERN_INFO, &pdev->dev, "INSNREG01 is 0x%08x\n", val);
+
+ iounmap(base);
+
+}
+EXPORT_SYMBOL_GPL(usb_set_qrk_bulk_thresh);
+
/*
* Intel's Panther Point chipset has two host controllers (EHCI and xHCI) that
* share some number of ports. These ports can be switched between either
diff --git a/drivers/usb/host/pci-quirks.h b/drivers/usb/host/pci-quirks.h
index c622ddf..617c22b 100644
--- a/drivers/usb/host/pci-quirks.h
+++ b/drivers/usb/host/pci-quirks.h
@@ -14,6 +14,8 @@ void usb_amd_quirk_pll_enable(void);
void usb_enable_intel_xhci_ports(struct pci_dev *xhci_pdev);
void usb_disable_xhci_ports(struct pci_dev *xhci_pdev);
void sb800_prefetch(struct device *dev, int on);
+bool usb_is_intel_qrk(struct pci_dev *pdev);
+void usb_set_qrk_bulk_thresh(struct pci_dev *pdev);
#else
struct pci_dev;
static inline void usb_amd_quirk_pll_disable(void) {}
--
1.7.9.5
--
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