USB: ehci-s5p: add DMA burst support
DMA burst support is added to improve performance in EHCI data
transfer. The USB EHCI controller on Exynos SoCs can use INCR16,
INCR8, and INCR4 mode. These modes of INSNREG00 register should
be set in order to enable DMA burst transfer. This feature is
also related to AHB spec.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Sangwook Lee <sangwook.lee@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/ehci-s5p.c b/drivers/usb/host/ehci-s5p.c
index 293f741..f098e2a 100644
--- a/drivers/usb/host/ehci-s5p.c
+++ b/drivers/usb/host/ehci-s5p.c
@@ -17,6 +17,15 @@
#include <plat/ehci.h>
#include <plat/usb-phy.h>
+#define EHCI_INSNREG00(base) (base + 0x90)
+#define EHCI_INSNREG00_ENA_INCR16 (0x1 << 25)
+#define EHCI_INSNREG00_ENA_INCR8 (0x1 << 24)
+#define EHCI_INSNREG00_ENA_INCR4 (0x1 << 23)
+#define EHCI_INSNREG00_ENA_INCRX_ALIGN (0x1 << 22)
+#define EHCI_INSNREG00_ENABLE_DMA_BURST \
+ (EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 | \
+ EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
+
struct s5p_ehci_hcd {
struct device *dev;
struct usb_hcd *hcd;
@@ -128,6 +137,9 @@
ehci->regs = hcd->regs +
HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
+ /* DMA burst Enable */
+ writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
+
dbg_hcs_params(ehci, "reset");
dbg_hcc_params(ehci, "reset");
@@ -234,6 +246,9 @@
if (pdata && pdata->phy_init)
pdata->phy_init(pdev, S5P_USB_PHY_HOST);
+ /* DMA burst Enable */
+ writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
+
if (time_before(jiffies, ehci->next_statechange))
msleep(100);