DA830 EVM: MUSB platform code

Properly set up the OTG mode thru the CFGCHIP2 register, enable the
USB0_DRVVBUS pin, and finally register the MUSB platform device.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index bfa790297f79..ccf66c755a7f 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -171,8 +171,37 @@ static __init void da830_evm_usb_init(void)
         cfgchip2 &= ~CFGCHIP2_USB1PHYCLKMUX;
         cfgchip2 |=  CFGCHIP2_USB2PHYCLKMUX;
 
+        /*
+         * We have to override VBUS/ID signals when MUSB is configured into the
+         * host-only mode -- ID pin will float if no cable is connected, so the
+         * controller won't be able to drive VBUS thinking that it's a B-device.
+         * Otherwise, we want to use the OTG mode and enable VBUS comparators.
+         */
+        cfgchip2 &= ~CFGCHIP2_OTGMODE;
+#ifdef  CONFIG_USB_MUSB_HOST
+        cfgchip2 |=  CFGCHIP2_FORCE_HOST;
+#else
+        cfgchip2 |=  CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN;
+#endif
+
         __raw_writel(cfgchip2, DA8XX_SYSCFG_VIRT(DA8XX_CFGCHIP2_REG));
 
+        /* USB_REFCLKIN is not used. */
+        ret = davinci_cfg_reg(DA830_USB0_DRVVBUS);
+        if (ret)
+                pr_warning("%s: USB 2.0 PinMux setup failed: %d\n",
+                           __func__, ret);
+        else {
+                /*
+                 * TPS2065 switch @ 5V supplies 1 A (sustains 1.5 A),
+                 * with the power on to power good time of 3 ms.
+                 */
+                ret = da8xx_register_usb20(1000, 3);
+                if (ret)
+                        pr_warning("%s: USB 2.0 registration failed: %d\n",
+                                   __func__, ret);
+        }
+
         ret = da8xx_pinmux_setup(da830_evm_usb11_pins);
         if (ret) {
                 pr_warning("%s: USB 1.1 PinMux setup failed: %d\n",